CN212810346U

CN212810346U - Pole piece, battery cell and battery thereof

Info

Publication number: CN212810346U
Application number: CN202020695576.5U
Authority: CN
Inventors: 高旭
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-03-26
Anticipated expiration: 2030-04-29

Abstract

The utility model relates to a battery manufacturing technical field discloses a pole piece, battery electricity core and battery thereof, and pole piece wherein is formed by a plurality of slice mass flow body superpositions, and the outside of slice mass flow body is equipped with active substance layer, and the outside of slice mass flow body does not set up active substance layer's another part and forms utmost point ear district, and the outer cladding in utmost point ear district has conductive adhesive layer, and conductive adhesive layer switches on the utmost point district of a plurality of slice mass flow bodies of superpositions each other. The utility model discloses a process that conducting resin soaked, dried, the multilayer sheet mass flow body with in the pole piece bonds together, has avoided the welding just can realize switching on between layer and layer, collects the electric current of each layer sheet mass flow body together, forms a complete unit output current, and simple structure just connects reliable and stable.

Description

Pole piece, battery cell and battery thereof

Technical Field

The utility model relates to a battery manufacturing technology field specifically relates to pole piece, battery electricity core and battery thereof.

Background

In the production process of lithium batteries, aluminum foils are generally used as current collectors for current conduction for the positive electrode. When the multiple layers of positive plates, negative plates and diaphragms are stacked at intervals, if foreign matters or burrs exist between the layers, the diaphragms are easy to puncture to form short circuits; in addition, the needling experiment of the battery cell is also an important method for embodying the safety performance of the battery cell. In order to improve the needling performance of the battery core, a novel foil is developed in the industry, and the foil is respectively composed of an upper layer of aluminum foil, a lower layer of aluminum foil and a PET (polyester resin) layer clamped between the two layers of aluminum foils; after positive active materials are respectively coated on the upper side and the lower side of the upper layer of foil and the lower layer of foil, current in the positive active materials can be transmitted to the lug through the aluminum foil layer, but is separated by the PET layer before the upper layer of foil and the lower layer of foil, so that two independent conductive units are formed, and the needling result of the battery cell is improved. When the foil is used for welding the tabs, the current of the middle tab layer cannot be normally led out to the tab connecting sheet due to the existence of the PET layer.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the foil use that prior art exists, the problem of unable connection between the multilayer slice mass flow body of pole piece provides pole piece, battery electricity core and battery, collects the electric current of each layer mass flow body together through conductive adhesive layer, forms a complete unit to with current output, simple structure just connects reliable and stable.

In order to achieve the above object, the utility model provides a pole piece is formed by a plurality of slice mass flow body superpositions, some of the outside of slice mass flow body is equipped with the active material layer, the outside of slice mass flow body does not set up the ear of utmost point district is formed to another part on active material layer, the outer cladding in ear of utmost point district has conductive adhesive layer, conductive adhesive layer is with a plurality of slice mass flow bodies of superpositions ear of utmost point district switches on each other.

Preferably, the sheet-shaped current collector comprises a film layer and aluminum foil layers arranged on the upper side and the lower side of the film layer, and the active material layer is arranged outside the aluminum foil layers.

Preferably, a plurality of the sheet-shaped current collectors are stacked at equal intervals.

Preferably, the equidistant spacing is 120-.

Preferably, the conductive adhesive layer is a mixture adhesive layer consisting of PVDF (polyvinylidene fluoride) adhesive solution, conductive carbon black and carbon nanotubes;

or the conductive adhesive layer comprises an adhesive layer matrix and a conductor arranged in the adhesive layer matrix, wherein the adhesive layer matrix comprises at least one of silicon rubber, polyurethane rubber, chloroprene rubber, hot melt adhesive and tackifying resin; the electric conductor comprises at least one of gold, silver, copper, aluminum, nickel and graphite.

Preferably, the thickness of the conductive adhesive layer is 60-100 micrometers.

Preferably, the coating area of the conductive adhesive layer in the length direction of the polar lug area is 80-85%.

Preferably, the film layer is a PET layer.

The utility model discloses the second aspect provides a battery electricity core, be in including electric core body and setting this internal as above of electric core pole piece.

A third aspect of the present invention provides a battery, including the battery cell as described above.

Through above-mentioned technical scheme, collect the electric current of each layer mass flow body together through conductive adhesive layer, form a complete unit to export electric current, simple structure and connection are reliable and stable.

Drawings

Fig. 1 is a schematic view of an overall structure of a pole piece according to an embodiment of the present invention;

fig. 2 is a schematic view of the structure in the direction a of fig. 1.

Description of the reference numerals

100 pole pieces 110 sheet current collector 111 thin film layer 112 aluminum foil layer 120 active material layer 130 pole ear area 140 conductive glue layer 141 current intersection

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means upper, lower, left, and right as illustrated with reference to the accompanying drawings; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1 and in combination with fig. 2, the utility model provides a pole piece 100, pole piece 100 is formed by a plurality of flaky current collectors 110 superpose, a part of the outside of flaky current collector 110 is equipped with active material layer 120, the outside of flaky current collector 110 is not set up another part of active material layer 120 forms utmost point ear district 130, utmost point ear district 130 coats outward has conductive adhesive layer 140, conductive adhesive layer 140 switches on a plurality of flaky current collectors 110 that superpose utmost point ear district 130 each other. According to the above, the utility model discloses a conductive adhesive layer switches on each other the utmost point ear district of a plurality of slice mass flow bodies of superpose together, avoids the welding just can realize switching on each other between layer, collects the electric current of each layer mass flow body together through conductive adhesive layer, forms a complete unit to with current output, simple structure and connect reliable and stable.

Further, as shown in fig. 1, the sheet-like current collector 110 includes a film layer 111 and aluminum foil layers 112 disposed on upper and lower sides of the film layer 111, and the active material layer 120 is disposed outside the aluminum foil layers 112. In order to ensure that the current collected by the sheet-shaped current collector 110 stacked in multiple layers on the pole piece is continuously stable, a plurality of the sheet-shaped current collectors 110 are stacked at equal intervals. The equidistant spacing is 120-150 microns. In an embodiment of the present invention, the conductive adhesive layer 140 is a mixture adhesive layer composed of PVDF adhesive solution, conductive carbon black and carbon nanotubes. In another embodiment of the present invention, the conductive adhesive layer includes an adhesive layer base and an electrical conductor disposed in the adhesive layer base, and the adhesive layer base includes at least one of silicone rubber, polyurethane rubber, neoprene rubber, hot melt adhesive, and tackifying resin; the electric conductor comprises at least one of gold, silver, copper, aluminum, nickel and graphite. The layer of conductive glue 140 is typically provided at a thickness of 60-100 microns. In addition, in order to ensure that all the pole ear regions 130 are completely covered without causing adverse effects on other connection structures, the covering area of the conductive adhesive layer 140 in the length direction of the pole ear regions 130 is 80-85%. Typically, the film layer 111 is a PET layer, commonly known as polyester resin.

The utility model discloses the second aspect provides a battery electricity core, be in including electric core body and setting this internal as above of electric core pole piece 100. Because the conductive adhesive layer 140 is formed on the multilayer overlapping structure of the sheet current collectors 110 arranged inside the pole piece 100 in the battery cell by soaking and drying the conductive adhesive, the conductive adhesive layer 140 enables the currents in the sheet current collectors 100 to be gathered together to form a complete unit and outputs the currents, and the structure is simple and the connection is stable and reliable.

A third aspect of the present invention provides a battery, including the battery cell as described above. Similarly, the utility model provides a battery, the multilayer sheet mass flow body 100 of superpose bonds together through conducting resin layer 140 in pole piece 100 in its battery electric core, realizes switching on between each sheet mass flow body 100, is favorable to the output of electric current.

The following describes the processing procedure of the pole piece provided by the present invention in detail with reference to fig. 1 and fig. 2. First, a plurality of sheet-shaped current collectors 100 are stacked in multiple layers; secondly, placing the tab area 130 of the stacked multilayer sheet-shaped current collector 100 in a conductive adhesive formed by PVDF glue solution, conductive carbon black, carbon nano tubes and the like for soaking; and after the pole piece is completely soaked, drying the pole piece to form a final pole piece structure. Due to the existence of the conductive adhesive layer 140, the current in each layer of the sheet-shaped current collector 100 can be gathered together through the conductive adhesive layer 140 to form a complete sheet-shaped unit, thereby realizing the output of the current.

Can know by the course of working of above-mentioned pole piece, the utility model discloses a process that conducting resin soaked, dried bonds the multilayer flaky mass flow body in the pole piece together, has avoided the welding, just can realize switching on between layer and layer, collects the electric current of each layer flaky mass flow body together, forms a complete unit output current, simple structure and connects reliable and stable.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The utility model discloses an in the technical conception scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, for example, can how much select conductive adhesive layer's thickness according to the number of piles of flaky mass flow body superpose. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a pole piece, its characterized in that forms by the superpose of a plurality of sheet current collectors (110), some of the outside of sheet current collector (110) is equipped with active substance layer (120), the outside of sheet current collector (110) does not set up another part of active substance layer (120) forms utmost point ear district (130), utmost point ear district (130) outer cladding has conductive adhesive layer (140), conductive adhesive layer (140) with a plurality of sheet current collectors (110) of superpose utmost point ear district (130) switch on each other.

2. The pole piece of claim 1, wherein the sheet-like current collector (110) comprises a film layer (111) and aluminum foil layers (112) disposed on upper and lower sides of the film layer (111), and the active material layer (120) is disposed outside the aluminum foil layers (112).

3. The pole piece of claim 2, wherein a plurality of said sheet-like current collectors (110) are stacked with equal spacing.

4. The pole piece of claim 3 wherein the equidistant spacing is 120-150 microns.

5. The pole piece of claim 1, wherein the thickness of the layer of conductive glue (140) is 60-100 microns.

6. The pole piece according to any one of claims 1 to 5, characterized in that the coating area of the conductive adhesive layer (140) in the length direction of the pole ear region (130) is 80-85%.

7. The pole piece of claim 2, wherein the film layer (111) is a PET layer.

8. A battery cell, characterized by comprising a cell body and a pole piece (100) according to any of claims 1 to 7 disposed within the cell body.

9. A battery comprising the battery cell of claim 8.