JP4964818B2 - Winding element manufacturing equipment - Google Patents

Description

  The present invention relates to an apparatus for manufacturing a winding element typified by a lithium ion battery or an electric double tank capacitor.

  For example, a battery element used as a secondary battery such as a lithium ion battery is configured by winding a belt-shaped body including a positive electrode foil and a negative electrode foil, and a separator interposed between both electrode foils (for example, , See Patent Document 1). Different active materials are applied to the surface of the positive foil and the surface of the negative foil.

In addition, as a device for winding the belt-like body, in order to wind up both the electrode foil and the separator, a winding means provided with a rotating means that can rotate about its own axis as a central axis, and the winding means It is generally known to include a positive foil supplying means for supplying positive foil, a negative foil supplying means for supplying a negative foil to the winding means, and a separator supplying means for supplying a separator to the winding means. (See, for example, Patent Document 2).
JP 2000-123818 A JP 2003-341893 A

  By the way, the active material is a fine powder. For this reason, when supplying the electrode foil, the active material may be peeled off from the electrode foil and may exist in a floating state in the air. Here, the active material applied to one electrode foil adheres to the other electrode foil or separator, and if the strip is wound in this state, the active material is caught in the strip. There is a risk that a short circuit or the like may occur in the battery element after winding.

  The present invention has been made in view of the above circumstances, and its purpose is to prevent the active material applied to one electrode foil from adhering to the other electrode foil, thereby preventing problems such as a short circuit in the winding element. It is an object of the present invention to provide a winding element manufacturing apparatus that can prevent generation more reliably and can improve production quality.

  In the following, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A device for manufacturing a wound element in which a positive electrode foil coated with a positive electrode active material and a negative electrode foil coated with a negative electrode active material on a surface are wound in an insulating state via an insulating separator. And
Winding means comprising a rotating means that can rotate about its own axis as a central axis in order to wind up the positive foil, the negative foil, and the separator;
A positive foil supply section that rotatably supports a positive foil in which the positive foil is wound into a roll, and supplies the positive foil to the winding means;
A negative electrode foil supply unit that rotatably supports a negative foil original roll formed by winding the negative electrode foil in a roll shape, and supplies the negative electrode foil to the winding means;
A separator supply unit that rotatably supports a separator original roll formed by winding the separator in a roll shape, and a separator supply unit that supplies the separator to the winding unit, and
A first positive foil side cover that is disposed so as to cover the positive foil supply part and has a first positive foil opening that allows supply of the positive foil to the winding means;
The positive electrode foil opening is disposed so as to cover the supply path of the positive foil from the first positive electrode foil opening to the vicinity of the winding means, and a second positive foil opening is provided immediately upstream of the winding means. A second positive foil side cover,
A first negative foil side cover which is disposed so as to cover the negative foil supply part and has a first negative foil opening which allows the supply of the negative foil to the winding means side;
The negative electrode foil opening is disposed so as to cover the supply path of the negative electrode foil from the first negative electrode foil opening to the vicinity of the winding means, and a second negative electrode foil opening is provided immediately upstream of the winding means. A winding element manufacturing apparatus, comprising: a second negative electrode foil side cover.

  According to the said means 1, the 1st positive electrode foil side cover and the 2nd positive electrode foil side cover are provided so that the positive electrode foil supply part and the positive electrode foil supply path may be covered. That is, the space where the positive electrode active material peeled off from the positive foil can exist and the space where the negative foil and the separator are located are physically separated by both the positive foil side covers. Thereby, it can prevent more reliably that the positive electrode active material which peeled from the positive electrode foil adheres to negative electrode foil and a separator.

  Moreover, the 1st negative electrode foil side cover and the 2nd negative electrode foil side cover are provided so that the negative electrode foil supply part and the negative electrode foil supply path may be covered. That is, the space where the negative electrode active material peeled from the negative electrode foil can exist and the space where the positive electrode foil and the separator are located are physically separated by both negative electrode foil side covers. As a result, it can prevent more reliably that a negative electrode active material adheres to positive electrode foil and a separator.

  As described above, according to this means 1, the active material peeled from one electrode foil adheres to the other electrode foil or the separator by providing both the positive electrode foil side covers and the both negative electrode foil side covers. Can be effectively prevented. As a result, it is possible to more reliably prevent the occurrence of defects such as a short circuit in the winding element, and to dramatically improve the production quality.

Mean 2. Positive foil side suction means for sucking the gas in the second positive foil side cover into the first positive foil side cover;
2. The winding element manufacturing apparatus according to claim 1, further comprising negative foil side suction means for sucking the gas in the second negative electrode foil side cover into the first negative electrode foil side cover.

  According to the means 2, by providing the positive foil side suction means, the gas in the second positive foil side cover can be sucked into the first positive foil side cover, and the negative foil side suction means is provided. By providing, the gas in the second negative electrode foil side cover can be sucked into the first negative electrode foil side cover. That is, a gas flow from the second cover to the first cover can be created. Thereby, the active material which exists in both the 2nd covers can be attracted | sucked in both 1st covers, and an active material will come out from both 2nd opening parts formed in both 2nd covers by extension. Can be more reliably prevented. As a result, it is possible to more reliably prevent the active material peeled from one electrode foil from adhering to the other electrode foil or separator, and to further prevent the occurrence of problems such as a short circuit in the winding element. It can be surely prevented.

Means 3. A positive foil cutting means disposed immediately upstream of the winding means to cut the positive foil;
In order to cut the negative electrode foil, with negative electrode foil cutting means disposed immediately upstream of the winding means,
The positive foil cutting means is covered with the second positive foil cover, and
3. The winding element manufacturing apparatus according to means 1 or 2, wherein the negative foil cutting means is covered with the second negative foil side cover.

Conventionally, after winding the belt-like body, the electrode foil is cut by a cutting means such as a cutter, but the active material applied to the electrode foil may be peeled off by the impact at the time of cutting, etc. Foreign matter such as metal pieces may be generated. Here, since the cutting means is generally provided at a position relatively close to the winding means, the active material or foreign matter generated by the cutting means tends to reach the winding means, and as a result peels from one electrode foil. There is a concern that the active material or the metal piece adhered to the other electrode foil or the like. (Note that if the electrode foil or the like is wound while the metal piece is attached to the electrode foil or the separator, foreign matter may penetrate the separator and eventually cause a problem such as a short circuit in the wound element. is there.)
In this regard, according to the means 3, the positive foil cutting means for cutting the positive foil is covered with the second positive foil side cover, and the negative foil cutting means for cutting the negative foil is the second negative electrode. It is covered with a foil side cover. Thereby, it can suppress effectively that the active material and the metal piece which generate | occur | produced from the electrode foil at the time of cutting | disconnection of electrode foil come out to the winding-up means side from a cover. As a result, it is possible to more reliably suppress the active material and the like peeled off from one electrode foil from adhering to the other electrode foil or separator, and to more effectively prevent the occurrence of defects such as a short circuit in the winding element. Can be prevented.

  Moreover, when both the suction means of the said means 2 are provided together, the active material peeled off at the time of cutting | disconnection of electrode foil, the produced metal piece, etc. can be attracted | sucked to both 1st cover inward directions. Thereby, it can further prevent that the peeled active material, the produced metal piece, etc. come out from both 2nd opening parts, and the other electrode foil etc. of the active material etc. which peeled from one electrode foil Can be more effectively prevented.

Means 4. While forming the inner peripheral surface of the end on the winding means side of the second positive foil side cover to be narrowed toward the second positive foil opening,
Any one of means 1 to 3 characterized in that an inner peripheral surface of an end portion on the winding means side of the second negative electrode foil side cover is narrowed toward the opening of the second negative electrode foil. The manufacturing apparatus of the winding element as described in 2.

  According to the means 4, the inner peripheral surfaces of the end portions of the second covers on the winding means side are configured to be narrowed toward the second opening side. That is, the opening area of both the second cover openings is configured to be relatively small. Thereby, it is possible to more reliably prevent the active material and the like from coming out from the openings of the second covers to the winding means side, and the other electrode foil such as the active material peeled from the one electrode foil. Can be more reliably prevented.

  Moreover, when the said means 2 is employ | adopted, the flow velocity of the gas to the 1st cover inward direction in both 2nd opening parts can be made comparatively large (orifice effect). That is, the suction force of the active material or the like in the first cover inward direction can be further increased at both the second openings where the active material or the like is most likely to come out of the cover. Thereby, it is possible to further prevent the active material and the like peeled off from the electrode foil from coming out from the second opening to the winding means side. It can prevent more reliably that it adheres to the electrode foil of this.

  Means 5. The positive electrode foil side air blowing means for sending clean air or inert gas from the second positive electrode foil opening into the first positive electrode foil side cover is provided. Winding device manufacturing equipment.

  “Clean air” refers to air in which foreign matter such as dust is suppressed as much as possible by a filter or the like.

  According to the means 5, by providing the positive foil side air blowing means, it is possible to more reliably prevent the positive electrode active material and the like peeled from the positive foil from coming out of the second positive foil opening. Adhesion of the active material or the like to the negative electrode foil or the like can be further suppressed.

  In addition, if dust (especially containing sodium) floating in the air adheres to the electrode foil and gets caught in the electrode foil, there is a risk that problems such as a short circuit of the winding element may occur. Since the gas blown in the means 5 is clean air or inert gas, adhesion of dust or the like to the positive electrode foil can be prevented, and a short circuit of the winding element can be prevented more reliably.

  Means 6. The negative electrode foil side air blowing means for sending clean air or inert gas from the second negative electrode foil opening into the first negative electrode foil side cover is provided, according to any one of means 1 to 5 Winding device manufacturing equipment.

  According to the above means 6, by providing the negative foil side air blowing means, the negative electrode active material peeled from the negative foil is more reliably prevented from coming out from the second negative foil opening to the winding means side. can do. Thereby, adhesion to positive electrode foil etc. of a negative electrode active material etc. can be suppressed more reliably. Further, since the gas to be blown is clean air or inert gas, it is possible to prevent dust and the like from adhering to the negative electrode foil, and it is possible to more reliably prevent short circuit of the winding element.

Mean 7 A first separator-side cover that is disposed so as to cover the separator supply section and has a first separator opening that allows supply of the separator to the winding means;
The separator is disposed so as to cover the supply path of the separator from the first separator opening to the vicinity of the winding means, and has a second separator opening immediately upstream of the winding means. The winding device manufacturing apparatus according to any one of means 1 to 6, further comprising: a second separator side cover.

  In general, the separator is formed of, for example, a resin material such as polypropylene. However, the resin material is easily charged with static electricity, and thus foreign matters such as dust are relatively easily attached.

  In this respect, according to the means 7, the separator supply section and the separator supply path are covered with the first separator side cover and the second separator side cover. Thereby, it is possible to effectively prevent foreign matters such as dust from entering the space where the separator supply unit and the separator supply path exist. As a result, the adhesion of foreign matter to the separator can be more reliably suppressed, and problems such as a short circuit of the winding element can be more effectively prevented.

  Means 8. A separator-side suction means for sucking the gas in the second separator-side cover into the first separator-side cover and discharging the gas in the first separator-side cover to the outside is provided. The winding element manufacturing apparatus according to claim 7.

  According to the means 8, the separator side suction means sucks foreign matter such as dust present in the second separator side cover in the first separator side cover and discharges the foreign matter to the outside. it can. Thereby, the adhesion of foreign matter to the separator can be prevented more reliably.

Means 9. The opening area of the first positive foil opening is configured to be equal to or smaller than the opening area of the second positive foil opening,
The winding element manufacturing apparatus according to any one of means 1 to 8, wherein an opening area of the first negative electrode foil opening is configured to be equal to or smaller than an opening area of the second negative electrode foil opening.

  Peeling of the active material from the electrode foil tends to occur particularly when the electrode foil is drawn out to the winding means in the positive electrode foil supply unit or the negative electrode foil supply unit. Therefore, when the first cover and the second cover are compared, a large amount of the active material may be present in the first cover that covers the supply unit.

  In this regard, according to the means 9, the opening areas of both the first openings are set to be smaller than the opening areas of both the second openings. Thereby, it can prevent more reliably that the active material which peeled from the inside of the 1st cover into the 2nd cover will move. Therefore, the amount of the active material present in the second cover can be reduced, and as a result, the active material can be effectively suppressed from coming out from the second opening to the winding means side.

  Hereinafter, an embodiment will be described with reference to the drawings.

  First, the configuration of a lithium ion battery element as a winding element obtained by the winding element manufacturing apparatus of the present embodiment will be described. As shown in FIG. 1, a lithium ion battery element (hereinafter referred to as “battery element”) 1 has two separators 3, 4, a positive foil 5, and a negative foil 6 with respect to a cylindrical core 2. It is comprised by winding the strip | belt-shaped body 7 comprised by these. In FIG. 1, for convenience of explanation, the separators 3 and 4, the positive electrode foil 5, and the negative electrode foil 6 are shown with a space therebetween.

  In the present embodiment, the core core 2 is formed of a material having sufficient rigidity (for example, hard resin, aluminum, or the like). Further, the core core 2 has an insertion hole 8 having a non-circular cross section (in this embodiment, a square cross section).

  Further, the separators 3 and 4 have the same width as the length along the longitudinal direction of the core core 2 and prevent the positive foil 5 and the negative foil 6 from contacting each other and causing a short circuit. In particular, the insulator is made of polypropylene (PP) which is a thermoplastic resin material in the present embodiment.

  In addition, the positive electrode foil 5 and the negative electrode foil 6 also have substantially the same width as the length along the longitudinal direction of the core core 2, similarly to the separators 3 and 4.

  A positive electrode active material (not shown) (for example, lithium cobalt oxide particles) is applied to both the front and back surfaces of the positive electrode foil 5, while a negative electrode active material (for example, not shown) is applied to the back and front surfaces of the negative electrode foil 6. , Particles containing silicon, etc.) are applied. Thereby, ion exchange between the positive electrode foil 5 and the negative electrode foil 6 can be performed through the positive electrode active material and the negative electrode active material. More specifically, ions move from the positive foil 5 side to the negative foil 6 side during charging, and conversely, ions move from the negative foil 6 side to the positive foil 5 side during discharge. A plurality of positive leads (not shown) extend from one edge in the width direction of the positive foil 5 and a plurality of negative leads (not shown) extend from the other edge in the width direction of the negative foil 6.

  In obtaining a lithium ion battery, the battery element 1 is placed in a cylindrical battery container (not shown) made of metal, and the positive electrode lead and the negative electrode lead are combined. Then, the combined positive lead is connected to a positive terminal component (not shown), the negative electrode lead is also connected to a negative terminal component (not shown), and both terminal components are opened at both ends of the electric container. By providing in, a lithium ion battery can be obtained.

  Next, a winding element manufacturing apparatus 10 for manufacturing the battery element 1 will be described. As shown in FIG. 2, the winding element manufacturing apparatus 10 has a winding means 11 for winding the strip 7 and a positive foil supply for supplying the positive foil 5 to the winding means 11 side. Part 21, negative electrode foil supply part 31 for supplying the negative electrode foil 6 to the winding means 11 side, and separator supply parts 41 and 51 for supplying the separators 3 and 4 to the winding means 11 side, respectively. With. In addition, the winding means 11, the positive electrode foil supply part 21, the negative electrode foil supply part 31, and the separator supply parts 41 and 51 are accommodated in the housing 20 having a rectangular cross section.

  As shown in FIG. 3, the winding means 11 includes a turret 12 that is rotatably provided. The turret 12 is configured such that two disk-shaped tables 14 and 15 are opposed to each other, and the rotation means 16 is symmetric about the centers of the tables 14 and 15 across the tables 14 and 15. Two centers are provided. Both tables 14 and 15 (turret 12) are configured to be rotatable in the clockwise direction (both tables 14 and 15 may be configured to be rotatable by 180 °), and both tables 14 and 15 are also configured. Is set to rotate synchronously. Thereby, each rotation means 16 can move between the attachment / detachment position P <b> 1 for attaching / detaching the core core 2 and the winding position P <b> 2 for winding the belt-like body 7 around the core core 2. . In addition, in the said attachment / detachment position P1, the core core 2 can be attached or detached by the attachment / detachment means 13 which can clamp the core core 2. FIG.

  The rotating means 16 is configured to be rotatable about its own axis as a central axis, and the winding core 2 is mounted on the outer peripheral portion thereof. In order to correspond to the cross-sectional shape of the insertion hole 8 of the core core 2, at least a portion of the rotating means 16 where the core core 2 is mounted is formed in a square cross section. Thereby, it is possible to prevent the core core 2 from moving relative to the rotating means 16 when the rotating means 16 rotates.

  Returning to FIG. 2, the positive foil supply unit 21 includes a rotary shaft 22 that can freely rotate about its own axis, and the positive foil 5 is wound around the rotary shaft 22 in a roll shape. A positive foil original fabric 23 is attached. In addition, the path | route (positive electrode foil supply path | route 25) by which the positive electrode foil 5 is supplied to the said winding means 11 from the positive electrode foil supply part 21 is always substantially the same by the pulley 24 etc. for supporting the positive electrode foil 5. That is, it is set so that the positive electrode foil 5 always passes on substantially the same orbit. Further, a positive foil side tension applying mechanism (not shown) for applying a predetermined tension to the positive foil 5 and preventing loosening of the positive foil 5 is provided in the middle of the positive electrode foil supply path 25. Yes.

  In addition, the positive foil supply part 21 includes a positive foil automatic joining mechanism (not shown). The positive foil auto-joining mechanism includes a starting end portion of a new positive foil raw fabric 23 and a terminal end portion of the positive foil original fabric 23 immediately before disappearing, immediately before the positive foil original fabric 23 mounted on the rotary shaft 22 disappears. Thus, continuous supply of the positive electrode foil 5 to the winding means 11 is enabled.

  Further, on the winding means 11 side of the positive foil supply path 25, a positive foil guide means 29 for guiding the positive foil 5 to the winding means 11 is provided. More specifically, the positive foil guide 29 includes a positive foil clamp (not shown) that can hold the positive foil 5 and can move to the winding means 11, and the positive foil clamp is positive foil. The positive foil 5 can be guided to the take-up means 11 by moving closer to the take-up means 11 after sandwiching the end of 5. Further, the positive foil guide 29 is provided with a positive foil cutter 26 as a positive foil cutter for cutting the positive foil 5 after the strip 7 is wound. Further, the positive foil guide 29 includes a positive foil meandering correction mechanism (not shown) for preventing the positive foil 5 from being supplied in a meandering state.

  The negative electrode foil supply unit 31 includes a rotation shaft 32 that can freely rotate about its own axis, and the negative electrode foil original is formed by winding the negative electrode foil 6 in a roll shape on the rotation shaft 32. Anti-33 is attached. The path (negative electrode foil supply path 35) through which the negative electrode foil 6 is supplied from the negative electrode foil supply unit 31 to the winding means 11 is always substantially the same by the pulley 34 and the like for supporting the negative electrode foil 6. That is, it is set so that the negative electrode foil 6 always passes on substantially the same track. Further, a negative electrode foil tension applying mechanism (not shown) capable of applying a predetermined tension to the negative electrode foil 6 is provided in the middle of the negative electrode foil supply path 35 in order to prevent the negative electrode foil 6 from slackening during supply. It has been.

  Further, the negative electrode foil supply unit 31 includes a negative foil automatic joining mechanism (not shown), and the negative foil 6 can be continuously supplied to the winding means 11 by the negative foil automatic joining mechanism. ing.

  In addition, negative electrode foil guide means 39 for guiding the negative electrode foil 6 to the winding means 11 is provided on the winding means 11 side of the negative electrode foil supply path 35. More specifically, the negative electrode foil guide means 39 includes a negative electrode foil clamp (not shown) that can hold the negative electrode foil 6 and can move to the winding means 11 side. The negative electrode foil 6 can be guided to the winding means 11 by moving toward and close to the winding means 11 after sandwiching the end of 6. Also, the negative electrode foil guide means 39 is supplied in a state where the negative foil foil 6 meanders, and the negative foil cutter 36 as a negative foil cutting means for cutting the negative foil 6 after the strip 7 is wound. And a negative electrode foil meandering correction mechanism (not shown) for preventing this.

  Further, the separator supply unit 41 (51) includes a rotating shaft 42 (52) that can freely rotate about its own axis, and the separator 3 (4) is wound around the rotating shaft 42 (52). A roll-shaped separator web 43 (53) that is rotated is mounted. A path [separator supply path 45 (55)] through which the separator 3 (4) is supplied from the separator supply unit 41 (51) to the winding means 11 side is a pulley for supporting the separator 3 (4). 44 (54), etc., so that the separators 3 (4) always pass substantially the same track. A separator tension applying mechanism (not shown) for preventing the separator 3 (4) from slackening is provided in the middle of the separator supply path 45 (55).

  In addition, separator guide means 49 (59) for guiding the separator 3 (4) to the winding means 11 is provided on the winding means 11 side of the separator supply path 45 (55). The separator guide means 49 (59) can hold the separator 3 (4), and also has a separator clamp (not shown) for guiding the sandwiched separator 3 (4) to the winding means 11 side, and a belt-like body. 7 is provided with a separator cutter 46 (56) for cutting the separator 3 (4) after winding.

  Furthermore, in the present embodiment, the first positive foil side cover 61 is provided so as to cover the positive foil supply part 21 (the first positive foil side cover 61 also for the positive foil automatic joining mechanism). Covered with). Further, the first positive foil side cover 61 includes a first positive foil opening 68 for allowing supply to the downstream side (winding means 11 side) of the positive foil 5. Here, the opening area of the first positive electrode foil opening 68 is configured to be equal to or less than the opening area of the second positive electrode foil opening 69 described later.

  Further, a second positive foil side cover 62 is disposed so as to cover the positive foil supply path 25 from the first positive foil opening 68 to the vicinity of the winding means 11. In addition, the second positive electrode foil side cover 62 is provided with a second positive electrode foil opening 69 immediately upstream of the winding means 11 so as to allow supply of the positive electrode foil 5. The positive foil guide 29 (the positive foil cutter 26), the positive foil tension application mechanism, and the positive foil meandering correction mechanism are also covered with the second positive foil side cover 62.

  Further, an inner peripheral surface of an end portion of the second positive electrode foil side cover 62 located on the winding means 11 side is formed so as to be narrowed toward the second positive electrode foil opening 69 side. ing. As a result, the opening area of the second positive foil opening 69 is relatively small.

  Furthermore, a first negative electrode foil side cover 71 is provided so as to cover the negative electrode foil supply part 31, and the first negative electrode foil side cover 71 supplies the negative electrode foil 6 to the winding means 11 side. Is provided with a first negative electrode foil opening 78. Note that the negative electrode foil automatic joining mechanism is also covered with the first negative electrode foil side cover 71. The first negative electrode foil opening 78 is configured such that the opening area is equal to or smaller than the opening area of the second negative electrode foil opening 79 described later.

  In addition, a second negative foil side cover 72 is disposed so as to cover the negative foil supply path 35 from the first negative foil opening 78 to the vicinity of the winding means 11. The second negative foil side cover 72 is provided with a second negative foil opening 79 immediately upstream of the winding means 11 in order to allow the supply of the negative foil 6. The negative foil guide 39 (the negative foil cutter 36), the negative foil tension application mechanism, and the negative foil meandering correction mechanism are also covered with the second negative foil side cover 72.

  Further, an inner peripheral surface of an end portion of the second negative electrode foil side cover 72 located on the winding means 11 side is formed so as to be narrowed toward the second negative electrode foil opening 79 side. ing. Thereby, the opening area of the second negative electrode foil opening 79 is relatively small.

  A first separator-side cover 81 (91) is provided to cover the separator supply unit 41 (51). The first separator-side cover 81 (91) includes a first separator opening 88 (98) to allow supply of the separator 3 (4) to the winding means 11.

  Further, a second separator side cover 82 (92) is provided to cover the separator supply path 45 (55) located between the first separator opening 88 (98) and the vicinity of the winding means 11. ing. The second separator side cover 82 (92) includes a second separator opening 89 (99) located immediately upstream of the winding means 11, and the separator guide means 49 (59) It is covered with a separator side cover 82 (92). Further, the inner peripheral surface of the end of the second separator side cover 82 (92) on the winding means 11 side is formed so as to be narrowed toward the second separator opening 89 (99). Thereby, the opening area of the second separator opening 89 (99) is relatively small. The first separator opening 88 (98) is configured such that the opening area is equal to or smaller than the opening area of the second separator opening 89 (99).

  In addition, the first positive foil side cover 61 is formed with a pair of communication holes 63 and 64 that communicate with the outside of the housing 20, and the communication holes 63 and 64 connect a predetermined exhaust pipe 65. Through the positive electrode foil side suction means 66 outside the housing 20. The positive foil side suction means 66 is for exhausting the air in the first positive foil side cover 61 from the communication holes 63 and 64 to the outside of the housing 20. The air in the second positive electrode foil side cover 62 can be sent into the first positive electrode foil side cover 61 by discharging the air in the first positive electrode foil side cover 61 to the outside. (That is, the air flow from the second positive foil side cover 62 to the first positive foil side cover 61 can be made).

  Further, the first negative electrode foil side cover 71 is formed with a pair of communication holes 73, 74 communicating with the outside of the housing 20, and the communication holes 73, 74 are connected via a predetermined exhaust pipe 75. The negative electrode foil side suction means 76 is connected. The negative foil side suction means 76 allows the air in the first negative electrode foil side cover 71 to be discharged out of the housing 20, and consequently the air in the second negative electrode foil side cover 72 is discharged to the first negative electrode. It can be sent into the foil side cover 71 (that is, the air flow from the second negative foil side cover 72 to the first negative foil side cover 71 can be made). .

  Further, the winding means 11 is sandwiched between the second covers 62, 72, 82, 92 and the second openings 69, 79, 89, 99 located on the winding means 11 side. Air supply means 101 is provided as positive foil side blowing means and negative foil side blowing means. The air supply means 101 has a filter for cleaning air (not shown). The filter removes foreign matter such as dust in the air as much as possible, and clean air from which foreign matter has been removed is taken up on the winding means 11 side (white It is designed to blow in the direction of the arrow.

  Next, a method for manufacturing the battery element 1 using the above-described winding element manufacturing apparatus 10 will be described.

  First, the positive foil side suction unit 66, the negative foil side suction unit 76, and the air supply unit 101 are operated. Thereby, the dust etc. which exists in the housing 20 are discharged | emitted outside, and it is set as the state which dust does not exist as much as possible in the winding means 11 or its vicinity. In the subsequent winding of the strip 7, the positive foil side suction means 66, the negative foil side suction means 76, and the air supply means 101 are always in operation.

  Next, the turret 12 is rotated halfway clockwise to move one rotating means 16 to the attachment / detachment position P1. At this time, the other rotating means 16 is positioned at the winding position P2. For example, the rotating means 16 that has been positioned at the winding position P2 until the winding of the belt-like body 7 is almost completed is moved to the attachment / detachment position P1. On the other hand, the rotating means 16 that has been positioned at the attachment / detachment position P1 and on which the new core core 2 is mounted is moved to the winding position P2.

  In the rotating means 16 located at the winding position P2, the core core 2 is mounted. For example, when the core core 2 is made of resin, the separator clamp is formed by a heat welding means (not shown). The end portions of the separators 3 and 4 guided by the above are thermally welded to the core core 2. For example, when the core core 2 is made of metal, the separators 3 and 4 may be bonded to the core core 2 with a tape or the like.

  Next, the positive electrode foil clamp and the negative electrode foil clamp supply the positive electrode foil 5 and the negative electrode foil 6 to the winding means 11 (core core 2) side at a predetermined timing. , 4 are wound in an insulated state. When the winding of the strip 7 is almost completed, the positive foil 5, the negative foil 6, and the separators 3, 4 are cut by the cutters 26, 36, 46, 56. Thereafter, by rotating the turret 12 halfway clockwise, the rotation means 16 (the side on which the belt-like body 7 is wound around the core core 2) is moved to the attachment / detachment position P1. The battery element 1 is obtained by removing the core 2 around which the belt-like body 7 is wound from the rotating means 16 by the attaching / detaching means 13.

  As described above in detail, according to the winding element manufacturing apparatus 10 of the present embodiment, the first positive foil side cover 61 and the second positive electrode are provided so as to cover the positive foil supply part 21 and the positive foil supply path 25. A foil side cover 62 is provided. That is, the space where the positive electrode active material peeled from the positive electrode foil 5 can exist and the space where the negative electrode foil 6 and the separators 3 and 4 are located are physically separated by both the positive electrode foil side covers 61 and 62. Thereby, it can prevent more reliably that the positive electrode active material which peeled from the positive electrode foil 5 adheres to the negative electrode foil 6 and the separators 3 and 4. FIG.

  A first negative foil side cover 71 and a second negative foil side cover 72 are provided so as to cover the negative foil supply part 31 and the negative foil supply path 35. That is, the space where the negative electrode active material peeled from the negative electrode foil 6 can exist and the space where the positive electrode foil 5 and the separators 3 and 4 are located are physically separated by the negative electrode foil side covers 71 and 72. As a result, it is possible to more reliably prevent the negative electrode active material from adhering to the positive electrode foil 5 and the separators 3 and 4.

  As described above, according to the present embodiment, by providing both the positive electrode foil side covers 61 and 62 and the both negative electrode foil side covers 71 and 72, the active material peeled from one electrode foil 5 (6) Can be effectively prevented from adhering to the electrode foil 6 (5) and the separators 3 and 4. Thereby, generation | occurrence | production of malfunctions, such as a short circuit, in battery element 1 can be prevented more reliably, and production quality can be improved greatly.

  Further, by providing the positive foil side suction means 66 and the negative foil side suction means 76, the active material present in both the second covers 62 and 72 can be sucked into the first covers 61 and 71, As a result, it can prevent more reliably that an active material comes out from both the 2nd opening parts 69 and 79. FIG. As a result, it is possible to more reliably prevent the active material peeled from one electrode foil 5 (6) from adhering to the other electrode foil 6 (5) or the separators 3 and 4, and the battery element. 1 can be more reliably prevented from occurring such as a short circuit.

  Furthermore, in the present embodiment, the positive foil cutter 26 is covered with a second positive foil side cover 62, and the negative foil cutter 36 is covered with a second negative foil side cover 72. Thereby, it can suppress effectively that the active material and the metal piece which generate | occur | produced from the electrode foils 5 and 6 at the time of cutting of the electrode foils 5 and 6 come out from the covers 62 and 72 to the winding-up means 11 side. As a result, it is possible to more reliably suppress the active material and the like peeled from one electrode foil 5 (6) from adhering to the other electrode foil 6 (5) and the separators 3 and 4, and the battery element 1. Occurrence of defects such as a short circuit can be more effectively prevented.

  Moreover, the active material peeled off when the electrode foils 5 and 6 are cut, the generated metal pieces, and the like can be sucked into the first covers 61 and 71 by the both suction means 66 and 76. Thereby, it is possible to further prevent the peeled active material and the generated metal pieces from coming out of the second openings 69 and 79, and the active material peeled from one of the electrode foils 5 (6). Can be more effectively prevented from adhering to the other electrode foil 6 (5).

  In addition, the inner peripheral surfaces of the ends of the second covers 62 and 72 on the winding means 11 side are configured to be narrowed toward the second openings 69 and 79. That is, the opening areas of both the second cover openings 69 and 79 are configured to be relatively small. Thereby, it can prevent more reliably that an active material etc. come out to the winding-up means 11 side from both said 2nd opening parts 69 and 79, and the active material which peeled from one electrode foil 5 (6) Can be more reliably prevented from adhering to the other electrode foil 6 (5).

  In addition, by making the opening area of the second openings 69 and 79 relatively small, the gas flowing in the first covers 61 and 71 in the second openings 69 and 79 is generated by the suction means 66 and 76. The flow rate can be made relatively large. That is, the suction force of the active material or the like toward the inside of the first cover 61 or 71 can be further increased in the second openings 69 and 79 where the active material or the like is most concerned about coming out of the cover. . Thereby, it is possible to further prevent the active material or the like peeled from the electrode foils 5 and 6 from coming out of the second openings 69 and 79 toward the winding means 11, and consequently one of the electrode foils 5 ( It can prevent more reliably that the active material etc. which peeled from 6) adhere to the other electrode foil 6 (5).

  In addition, by providing the air supply means 101, it is possible to more reliably prevent the active material and the like peeled from the electrode foils 5 and 6 from coming out of the second positive electrode foil openings 69 and 79. Thereby, the adhesion of the active material or the like to the electrode foils 5, 6, etc. can be further suppressed, and a short circuit or the like of the battery element 1 can be more reliably prevented.

  In the present embodiment, the air supply means 101 realizes the positive foil side air blowing means and the negative electrode foil side air blowing means all at once. For this reason, complication of the apparatus can be prevented.

  Furthermore, since the gas sent by the air supply means 101 is clean air, it is possible to effectively suppress a situation in which foreign matters such as dust adhere to the electrode foils 5 and 6 and the separators 3 and 4. As a result, a short circuit or the like of the battery element 1 can be prevented more reliably, and the production quality can be further improved.

  In addition, the separator supply unit 41 (51) and the separator supply path 45 (55) are covered with the first separator-side cover 81 (91) and the second separator-side cover 82 (92). Thereby, it is possible to effectively prevent foreign substances such as dust from entering the space where the separator supply unit 41 (51) and the separator supply path 45 (55) are present. As a result, adhesion of foreign matter to the separator 3 (4) can be more reliably suppressed, and problems such as a short circuit of the battery element 1 can be more effectively prevented.

  Further, since the opening areas of both the first openings 68 and 78 are set to be smaller than the opening areas of both the second openings 69 and 79, the second cover 62 is provided from within the first covers 61 and 71. , 72 can be more reliably prevented from moving into the separated active material. As a result, the amount of active material present in the second covers 62 and 72 can be reduced, and as a result, the active material is effectively discharged from the second openings 69 and 79 to the winding means 11 side. Can be suppressed.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the said embodiment, although the 1st separator side cover 81,91 and the 2nd separator side cover 82,92 are provided, all or one part of the separator side cover 81,82,91,92 is not provided. It is good also as comprising.

  (B) In the above embodiment, lithium cobaltate particles are exemplified as the positive electrode active material, but other lithium-containing metal oxides such as lithium nickelate and lithium manganate may be used. Moreover, although the particle | grains containing a fluorine etc. are illustrated as a negative electrode active material, it is good also as using a carbonaceous material etc. as a negative electrode active material, for example.

  (C) In the above embodiment, the average particle diameter of the positive electrode active material is not particularly defined. However, in recent years, the average particle diameter is relatively small (for example, 1 μm from the viewpoint of achieving rapid charge / discharge of the lithium ion battery. (For example, JP 2000-21391 A). Further, although the average particle diameter of the negative electrode active material is not particularly defined in the above embodiment, the negative electrode active material having a relatively small average particle diameter (for example, 20 μm or less) is similarly used (for example, JP, 2007-128766, etc.). However, by reducing the average particle diameter of the active material, the active material is more easily peeled off from the electrode foils 5 and 6, and as a result, the active material is more concerned about adhesion to the electrode foils 5 and 6. . In this respect, the use of the winding element manufacturing apparatus 10 of the above-described embodiment can effectively prevent the active material from adhering to the electrode foils 5, 6 and the like. That is, the winding element manufacturing apparatus 10 is more significant when the average particle size of the active material is relatively small.

  (D) In the above embodiment, the positive foil side suction means 66 and the negative foil side suction means 76 are provided, but the gas in the second separator side covers 82 and 92 is changed to the first separator side covers 81 and 91. Separator-side suction means for suctioning to the side and discharging to the outside may also be provided. In this case, foreign substances such as dust in the separator-side covers 81, 82, 91, 92 can be effectively removed, and the adhesion of foreign substances to the separators 3, 4 can be more reliably prevented. it can.

  (E) In the above embodiment, the separators 3 and 4 are made of PP, but the separators 3 and 4 may be made of other insulating materials.

  (F) In the above embodiment, clean air is blown from the air supply means 101. However, for example, an inert gas or the like may be blown.

It is a cross-sectional schematic diagram for showing the structure of a battery element. It is a schematic diagram which shows the manufacturing apparatus of the winding element in this embodiment. It is a front view for demonstrating the winding means in this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Battery element as winding element, 3, 4 ... Separator, 5 ... Positive electrode foil, 6 ... Negative electrode foil, 10 ... Manufacturing apparatus of winding element, 11 ... Winding means, 16 ... Rotating means, 21 ... Positive electrode foil Supply part 25 ... Positive foil supply path, 26 ... Positive foil cutter as positive foil cutting means, 31 ... Negative foil supply part, 35 ... Negative foil supply path, 36 ... Negative foil cutter as negative foil cutting means, 41, DESCRIPTION OF SYMBOLS 51 ... Separator supply part, 45,55 ... Separator supply path, 61 ... 1st positive electrode foil side cover, 62 ... 2nd positive electrode foil side cover, 66 ... Positive electrode foil side suction means, 68 ... 1st positive electrode foil opening part, 69 ... 2nd positive electrode foil opening part, 71 ... 1st negative electrode foil side cover, 72 ... 2nd negative electrode foil side cover, 76 ... Negative electrode foil side suction means, 78 ... 1st negative electrode foil opening part, 79 ... 2nd negative electrode foil opening Part, 81, 91 ... first separator side cover, 82, 92 ... second separator Data side cover, 83, 93 ... separator side partition plate, 88, 98 ... first separator opening, 89, 99 ... second separator opening, 101 ... positive foil side air blowing means and negative foil side air blowing means Supply means.

Claims (9)

A device for manufacturing a wound element in which a positive electrode foil coated with a positive electrode active material and a negative electrode foil coated with a negative electrode active material on a surface are wound in an insulating state via an insulating separator. And
Winding means comprising a rotating means that can rotate about its own axis as a central axis in order to wind up the positive foil, the negative foil, and the separator;
A positive foil supply section that rotatably supports a positive foil in which the positive foil is wound into a roll, and supplies the positive foil to the winding means;
A negative electrode foil supply unit that rotatably supports a negative foil original roll formed by winding the negative electrode foil in a roll shape, and supplies the negative electrode foil to the winding means;
A separator supply unit that rotatably supports a separator original roll formed by winding the separator in a roll shape, and a separator supply unit that supplies the separator to the winding unit, and
A first positive foil side cover that is disposed so as to cover the positive foil supply part and has a first positive foil opening that allows supply of the positive foil to the winding means;
The positive electrode foil opening is disposed so as to cover the supply path of the positive foil from the first positive electrode foil opening to the vicinity of the winding means, and a second positive foil opening is provided immediately upstream of the winding means. A second positive foil side cover,
A first negative foil side cover which is disposed so as to cover the negative foil supply part and has a first negative foil opening which allows the supply of the negative foil to the winding means side;
The negative electrode foil opening is disposed so as to cover the supply path of the negative electrode foil from the first negative electrode foil opening to the vicinity of the winding means, and a second negative electrode foil opening is provided immediately upstream of the winding means. A winding element manufacturing apparatus, comprising: a second negative electrode foil side cover. Positive foil side suction means for sucking the gas in the second positive foil side cover into the first positive foil side cover;
2. The winding element manufacturing apparatus according to claim 1, further comprising negative foil side suction means for sucking a gas in the second negative electrode foil side cover into the first negative electrode foil side cover. A positive foil cutting means disposed immediately upstream of the winding means to cut the positive foil;
In order to cut the negative electrode foil, with negative electrode foil cutting means disposed immediately upstream of the winding means,
The positive foil cutting means is covered with the second positive foil cover, and
The said negative electrode foil cutting | disconnection means is covered with the said 2nd negative electrode foil side cover, The manufacturing apparatus of the winding element of Claim 1 or 2 characterized by the above-mentioned. While forming the inner peripheral surface of the end on the winding means side of the second positive foil side cover to be narrowed toward the second positive foil opening,
The inner peripheral surface of the end portion on the winding means side of the second negative electrode foil side cover is formed to be narrowed toward the second negative electrode foil opening. The manufacturing apparatus of the winding element of Claim 1.   5. The positive electrode foil side blowing means for sending clean air or inert gas from the second positive electrode foil opening into the first positive electrode foil side cover is provided. 6. The manufacturing apparatus of the winding element as described in 2.   6. The negative electrode foil side blowing means for sending clean air or inert gas into the first negative electrode foil side cover from the second negative electrode foil opening is provided. 6. The manufacturing apparatus of the winding element as described in 2. A first separator-side cover that is disposed so as to cover the separator supply section and has a first separator opening that allows supply of the separator to the winding means;
The separator is disposed so as to cover the supply path of the separator from the first separator opening to the vicinity of the winding means, and has a second separator opening immediately upstream of the winding means. A winding element manufacturing apparatus according to claim 1, further comprising: a second separator side cover.   A separator-side suction means for sucking the gas in the second separator-side cover into the first separator-side cover and discharging the gas in the first separator-side cover to the outside is provided. The winding element manufacturing apparatus according to claim 7. The opening area of the first positive foil opening is configured to be equal to or smaller than the opening area of the second positive foil opening,
9. The winding element manufacturing apparatus according to claim 1, wherein an opening area of the first negative electrode foil opening is configured to be equal to or smaller than an opening area of the second negative electrode foil opening. .

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