CN112072205A - Insulating film for battery heat conduction and battery thereof - Google Patents
Insulating film for battery heat conduction and battery thereof Download PDFInfo
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- CN112072205A CN112072205A CN202010876119.0A CN202010876119A CN112072205A CN 112072205 A CN112072205 A CN 112072205A CN 202010876119 A CN202010876119 A CN 202010876119A CN 112072205 A CN112072205 A CN 112072205A
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- 239000003292 glue Substances 0.000 claims description 18
- 229920001296 polysiloxane Polymers 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- 238000007650 screen-printing Methods 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 125000001145 hydrido group Chemical group *[H] 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000020169 heat generation Effects 0.000 abstract description 2
- -1 polysiloxane Polymers 0.000 description 22
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- ZXKHOVDDJMJXQP-UHFFFAOYSA-N 1-ethenylcyclohexan-1-ol Chemical compound C=CC1(O)CCCCC1 ZXKHOVDDJMJXQP-UHFFFAOYSA-N 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000006244 Medium Thermal Substances 0.000 description 2
- 229910018540 Si C Inorganic materials 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000006459 hydrosilylation reaction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012974 tin catalyst Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides an insulating film for battery heat conduction and a battery thereof, wherein the insulating film for battery heat conduction covers the outer side of the battery, the battery is provided with a pole or a lug arranged at one end part in the length direction, and the heat conduction coefficient is gradually reduced from one end provided with the pole or the lug along the length direction of the battery. According to the heat dissipation characteristics of the battery, the insulating film with high heat conductivity coefficient is arranged on the outer side of the pole or the lug with high heat generation quantity, the insulating film with low heat conductivity coefficient is arranged at one end far away from the pole or the lug in the length direction, and the heat of the battery is quickly transferred through the gradient change of the heat conductivity coefficient of the insulating film, so that the temperature consistency of all parts of the battery is ensured, and the service life of the battery is prolonged. Particularly, for the battery module, the heat of the battery top cover can be rapidly transferred to the bottom, namely, the heat is transferred to the water-cooling heat dissipation system, so that the heat dissipation of the battery is accelerated.
Description
Technical Field
The invention relates to the technical field of insulating films, in particular to an insulating film for heat conduction of a battery and the battery.
Background
The lithium ion battery has been widely applied in the fields of consumer mobile phones, electric tools, medical electronics and the like due to the excellent performance of the lithium ion battery, and simultaneously has good application prospects in the fields of new energy automobiles, energy storage base stations and the like. Lithium ion batteries can be mainly classified into three categories, namely, cylindrical, square and soft packages, according to the packaging form, and different structures mean different advantages and disadvantages. Generally, the tab of the soft package battery extends out to be externally connected, and the tab is arranged in the length direction of the battery. The square battery is generally an aluminum-shell or steel-shell square battery, the square battery is simple in structure and high in mechanical strength, liquid leakage and other risks are not prone to occurring, and the square battery core occupies the dominant position of the market at present. On the premise that a battery chemical system is not changed, in order to further improve the energy density of a battery pack system, a battery core is designed into a thinner and longer structure, such as an MEB (polymer electrolyte battery) and a blade battery, and the longer the battery is, the larger the battery is, the more the heat dissipation consistency of the battery is, and the like, so that the service life of the battery is seriously influenced.
At present, the conventional practice in the industry is to surround a heat-conducting insulating film on the outer side of a battery to dissipate the heat inside the battery, and further, a layer of heat dissipation fins is further arranged on the basis of the heat-conducting fins to realize gradient heat transfer from inside to outside so as to avoid local overheating caused by heat accumulation on the battery.
Disclosure of Invention
The invention aims to provide an insulating film for heat conduction of a battery, which can effectively solve the problem of heat dissipation consistency of the battery.
The inventor finds in research that the heat generated by the battery at different positions during operation is different, and the heat generated by the part closer to the pole or the pole ear is higher. Especially for the blade battery, because the battery is very long, the heat generated at the pole ear position of the battery is high in the working process, and the temperature can not be transmitted to the center of the battery in time, so that the battery forms a temperature gradient difference, and the service life of the battery is influenced. Meanwhile, in the battery module, the water-cooling heat dissipation system is often contacted with the battery through the bottom, and the heat dissipation effect is achieved through heat exchange with the bottom of the battery, so that the temperature at the bottom of the battery is low, the temperature gradient difference is formed between the temperature at the bottom of the battery and the top of the battery, and the service life of the battery is influenced.
Based on this, the inventor provides an insulating film for heat conduction of a battery, which covers the outside of the battery, wherein the battery is provided with a pole or a tab arranged at one end part in the length direction, and the heat conduction coefficient is gradually reduced along the length direction of the battery from one end part provided with the pole or the tab.
According to the heat dissipation characteristics of the battery, the insulating film with high heat conductivity coefficient is arranged on the outer side of the pole or the lug with high heat generation quantity, the insulating film with low heat conductivity coefficient is arranged at one end far away from the pole or the lug in the length direction, and the heat of the battery is quickly transferred through the gradient change of the heat conductivity coefficient of the insulating film, so that the temperature consistency of all parts of the battery is ensured, and the service life of the battery is prolonged. Particularly, for the battery module, the heat of the battery top cover can be rapidly transferred to the bottom, namely, the heat is transferred to the water-cooling heat dissipation system, so that the heat dissipation of the battery is accelerated.
Furthermore, the heat conductivity coefficient is 0.1-3W/m.K, and the heat conductivity coefficient of the insulating film is in gradient change in the range, so that the effective rapid heat transfer can be ensured.
Furthermore, the heat-conducting module comprises an insulating substrate and heat-conducting glue arranged on the insulating substrate. Furthermore, the insulating substrate is made of PET, PP or PE. The preparation raw materials of the heat-conducting adhesive comprise 30-40 parts by weight of vinyl polysiloxane compound, 5-8 parts by weight of hydrogen polysiloxane compound, 0.2-0.4 part by weight of catalyst, 0.01-0.05 part by weight of retarder and 50-60 parts by weight of filler. The vinyl polysiloxane compound refers to polysiloxane containing vinyl, specifically methyl vinyl polysiloxane, and the hydrogen polysiloxane compound refers to polysiloxane containing active hydrogen, specifically both methyl hydrogen polysiloxane. The catalyst may be one selected from a platinum catalyst, a tin catalyst, and a vanadium catalyst. The retarder is alcohol retarder, such as 1-vinyl cyclohexanol, alkynyl cyclohexanol, etc., and can make the vinyl component and the silicon-hydrogen component mixed not to crosslink or delay crosslinking for a long time at normal temperature (20 deg.C), but crosslink rapidly when the temperature reaches the vulcanization temperature. The filler is mainly used for heat conduction and can be alumina, aluminum hydroxide, boron nitride and the like. The insulating film is adhered to the outer side of the battery through the heat-conducting glue, the vinyl group of the vinyl polysiloxane compound and the hydrogen group of the hydrogen-based polysiloxane compound can generate hydrosilylation reaction through the action of a catalyst in the heat-conducting glue to form a new Si-C bond, and linear silicon rubber is crosslinked into a three-dimensional grid structure to obtain the heat-conducting glue with high strength; and the three-dimensional grid structure mainly takes Si-C bonds and Si-O bonds as main chain structures, the main chain structures are not broken or decomposed at high temperature, good heat conduction effect can be achieved, and the heat conduction process is further accelerated by adding the heat conduction filler. The insulating film of the battery contains good heat conduction materials (polysiloxane and heat conduction filler), and the insulating films corresponding to different positions of the battery form heat conduction coefficient gradient through the design of the concentration or the type of the heat conduction materials, so that the heat of the battery is quickly transferred, the consistency of the temperature of each part of the battery is ensured, and the service life of the battery is prolonged.
Furthermore, the thickness of the heat conducting glue is 0.1-3.0 mm, so that extra battery space is avoided.
Furthermore, the raw materials for preparing the heat-conducting glue are coated on the insulating substrate through a screen printing technology. The preparation raw materials are baked at 80-120 ℃ after being subjected to screen printing to form a heat-conducting adhesive layer, the adhesive force of the heat-conducting adhesive layer on the insulating substrate is strong, and the heat-conducting adhesive with the heat-conducting coefficient gradually decreased in a gradient manner is easy to control. Furthermore, the heat-conducting glue with corresponding grains or patterns is formed by regulating and controlling the pictures and texts of the screen printing plate adopted by the screen printing, and different patterns and grains can be formed by the preparation raw materials of the heat-conducting glue passing through the picture and text positions. The porosity of the graph and text is gradually reduced along the length direction of the battery from the end provided with the pole or the tab, the porosity is low, namely the porosity is more and more sparse, and the raw materials for preparing the screen printing plate are less and less, so that the purpose of regulating and controlling the heat conductivity coefficient is achieved. And controlling the thickness of the heat-conducting glue by regulating and controlling the pressure of a scraper used for the screen printing.
The invention further provides a battery, which comprises a battery core and a pole or a lug extending out of the battery core, wherein the outer side of the battery core is covered with the insulating film for heat conduction of the battery.
Drawings
Fig. 1 is a schematic view of a first battery after covering an insulating film for battery thermal conduction.
Fig. 2 is a schematic view of a second battery after covering an insulating film for battery thermal conduction.
Fig. 3 is a schematic diagram of a third battery after covering an insulating film for battery thermal conduction.
Detailed Description
The insulating film for battery heat conduction of the present invention can be applied to various types of batteries, particularly to a strip-shaped battery. Preferred embodiments of the insulating film for battery thermal conduction according to the present invention will be described below with reference to the accompanying drawings of the specification given.
As shown in fig. 1 to 3, fig. 1 is a square battery, which has an electric core 1 and a positive pole post 2 and a negative pole post 3 extending out of the electric core 1, the positive pole post 2 and the negative pole post 3 are both located in the length direction of the electric core 1, a heat conducting insulating film 4 is wrapped around the electric core 1, of course, the heat conducting insulating film 4 may not wrap all the electric core 1, but only cover two large planes of the electric core 1, and the heat conducting insulating film 4 is adhered to the electric core 1 through a heat conducting adhesive. The heat-conducting insulating film 4 is provided with a high thermal conductivity part 41, a medium thermal conductivity part 42 and a low thermal conductivity part 43 in sequence from one end provided with the positive pole 2 and the negative pole 3 along the length direction of the battery, namely, the thermal conductivity is gradually reduced in sequence. The heat of the square battery is rapidly transferred through the gradient change of the heat conductivity coefficient of the heat-conducting insulating film 4, and the temperature consistency of all parts of the square battery is ensured.
Of course, the insulating film of the present invention is also applicable to the soft-package type blade battery shown in fig. 2 and fig. 3, and has an electric core 1 and positive electrode tabs 2 'and negative electrode tabs 3' extending out of the electric core 1, the positive electrode tabs 2 'and the negative electrode tabs 3' are both located in the length direction of the electric core 1, a heat-conducting insulating film 4 is wrapped around the electric core 1, of course, the heat-conducting insulating film 4 may not wrap all the electric core 1, but only cover two large planes of the electric core 1, and the heat-conducting insulating film 4 is adhered to the electric core 1 through a heat-conducting glue. Fig. 2 and fig. 3 are different from each other in that the positive tab 2 'and the negative tab 3' of the former are at the same end, and the positive tab 2 'and the negative tab 3' of the latter are at the opposite end. In fig. 2, the thermal conductive insulating film 4 is provided with a high thermal conductivity portion 41, a medium thermal conductivity portion 42, and a low thermal conductivity portion 43 in sequence from one end provided with the positive tab 2 'and the negative tab 3', that is, the thermal conductivity is gradually decreased in a gradient manner. In fig. 3, the heat conducting insulating film 4 is provided with a gradient of heat conductivity coefficients from two ends of the positive electrode tab 2 'and the negative electrode tab 3' to directions close to each other, and the two ends are high heat conductivity coefficient portions 41, and the middle portion is a low heat conductivity coefficient portion 43, i.e., the heat conductivity coefficients decrease gradually in a gradient manner from one end of the positive electrode tab 2 'or one end of the negative electrode tab 3' along the length direction of the soft-package type blade battery. The rapid heat transfer of the soft package type blade battery is realized through the gradient change of the heat conductivity coefficient of the heat-conducting insulating film 4, and the consistency of the temperature of each part of the soft package type blade battery is ensured.
To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples. It should be noted that the following implementation of the method is a further explanation of the present invention, and should not be taken as a limitation of the present invention.
Example 1
The square battery with the structure of FIG. 1 is adopted, and the heat conductivity coefficient of the high heat conductivity coefficient part is 2.8W/m.K, the heat conductivity coefficient of the medium heat conductivity coefficient part is 2.0W/m.K, and the heat conductivity coefficient of the low heat conductivity coefficient part is 1.0W/m.K. The insulating film wraps the two large faces and the side faces as well as the bottom face of the battery core 1.
The insulating film comprises a PET insulating substrate and heat-conducting glue arranged on the PET insulating substrate by screen printing of preparation raw materials, and the insulating film is adhered to the surface of the battery cell by the heat-conducting glue to wrap the battery cell. The heat-conducting adhesive is prepared from 35 parts of methyl vinyl polysiloxane, 8 parts of methyl hydrogen polysiloxane, 0.3 part of platinum catalyst, 0.03 part of 1-vinyl cyclohexanol, 20 parts of aluminum oxide, 20 parts of aluminum hydroxide and 20 parts of boron nitride. The thickness of the heat-conducting glue is controlled by regulating and controlling the pressure of the scraper plate adopted by screen printing, and the thickness of the heat-conducting glue after being baked and molded is 2.0 mm. The thermal conductivity coefficient on the insulating film is controlled to gradually decrease in a gradient manner along the length direction of the battery from one end provided with the positive pole and the negative pole by controlling the porosity of the pictures and texts, and is respectively 2.7W/m.K, 2.0W/m.K and 1.0W/m.K.
Comparative example 1
The square battery with the structure of fig. 1 is adopted, the insulating film wraps the two large faces, the side faces and the bottom face of the battery core 1, and the heat conductivity coefficient of the insulating film is 1.9W/m.k.
The insulating film includes PET insulating substrate and directly coats the heat conduction glue on PET insulating substrate through preparing the raw materials, and the insulating film is through the surface that heat conduction glue adhesion was on electric core and wrap up it. The heat-conducting adhesive is prepared from 35 parts of methyl vinyl polysiloxane, 8 parts of methyl hydrogen polysiloxane, 0.3 part of platinum catalyst, 0.03 part of 1-vinyl cyclohexanol, 20 parts of aluminum oxide, 20 parts of aluminum hydroxide and 20 parts of boron nitride. The thickness of the heat-conducting glue after baking and forming is 2.0 mm.
The prismatic batteries of example 1 and comparative example 1 were subjected to a 1C discharge temperature rise test in an incubator at 25C, and the temperatures of the top, large, and bottom portions of the prismatic batteries were monitored, with the results shown in table 1.
Table 1 temperature values of square battery at each position in 1C discharging temperature rise test
| Ambient temperature deg.C | Temperature of the top cover | Temperature of big surface | Bottom temperature C | |
| Example 1 | 25.1 | 30.3 | 29.9 | 29.4 |
| Comparative example 1 | 24.8 | 33.5 | 30.7 | 28.8 |
As can be seen from the results in table 1, comparative example 1 employs a common insulating film, the temperature of the top cover, the temperature of the large surface and the temperature of the bottom of the rectangular battery wrapped by the insulating film are different greatly, the difference is greater than 1.9 ℃, and from the top cover to the bottom, the temperature of the rectangular battery gradually decreases from the terminal toward the length direction of the battery because the heat generated from the top cover near the terminal is the largest. On the premise that the preparation raw materials of the embodiment 1 are the same as those of the comparative example 1, the same heat transfer coefficient is not adopted, the heat conductivity coefficient is gradually decreased from one end provided with the positive pole and the negative pole along the length direction of the cell, the preparation raw materials of the insulating film with the heat conductivity coefficient of 1.9W/m.K of the comparative example 1 are averagely divided into three equal parts with high, medium and low heat conductivity coefficients, the overall temperature distribution of the square cell can be more balanced, the difference between the top cover temperature and the large surface temperature is only 0.4 ℃, and the difference between the large surface temperature and the bottom temperature is only 0.5 ℃ and is less than 1 ℃.
The 20 square batteries of example 1 and comparative example 1 were combined into battery module 1 and battery module 1', respectively, and a hydrothermal heat dissipation system was provided at the bottom, including a water cooling system, and a 1C discharge temperature rise test was performed in a 25 ℃ incubator, and the temperatures of 1#, 2#, and 3# battery top cover positions in the battery module were monitored, and the results are shown in table 2. The 1#, 2#, and 3# batteries are respectively located at one end, the other end, and the middle of the battery module.
TABLE 2 temperature values of the battery module at various positions in the 1C discharge temperature rise test
As can be seen from the results in table 2, the heat conductivity coefficient of the heat conductive insulating film in embodiment 1 is gradually decreased along the length direction of the battery from the end where the positive electrode post and the negative electrode post are disposed, so that the heat of the battery in the battery module can be rapidly transferred to the water cooling position, the heat exchange with the water cooling system is accelerated, the overall temperature of the battery module is reduced, and the uniformity of the battery temperature is improved, thereby prolonging the service life of the battery.
The above disclosure is only a preferred embodiment of the present invention, which is convenient for those skilled in the art to understand and implement, and certainly not to limit the scope of the present invention, therefore, the present invention is not limited by the claims and their equivalents.
Claims (10)
1. The utility model provides an insulating film for battery heat conduction, cover in the outside of battery, the battery has the utmost point post or utmost point ear of locating a length direction's an end, its characterized in that, coefficient of heat conductivity follows to be equipped with one end of utmost point post or utmost point ear is followed the length direction of battery is the gradient and subtracts progressively.
2. The insulating film for battery thermal conduction according to claim 1, wherein the thermal conductivity is 0.1 to 3W/m.K.
3. The insulating film for battery thermal conduction according to claim 1, comprising an insulating substrate and a thermal conductive paste provided on the insulating substrate.
4. The insulating film for battery thermal conduction according to claim 3, wherein the material of the insulating substrate is PET, PP or PE.
5. The insulating film for battery thermal conduction according to claim 3, wherein the raw materials for preparing the thermal conductive paste include vinyl silicone compound, hydrido silicone compound, catalyst, retarder and filler.
6. The insulating film for battery heat conduction according to claim 3, wherein the thickness of the heat-conducting glue is 0.1-3.0 mm.
7. The insulating film for battery heat conduction according to claim 3, wherein a raw material for preparing the heat-conducting paste is coated on the insulating substrate by a screen printing technique.
8. The insulating film for battery heat conduction according to claim 7, wherein the heat conductive paste having a corresponding texture or pattern is formed by controlling the pattern and the text of a screen printing plate used for the screen printing.
9. The insulating film for battery thermal conduction according to claim 8, wherein the porosity of the pattern decreases in a gradient manner from the end provided with the terminal or tab along the length direction of the battery.
10. A battery, comprising a battery core and a pole or a tab extending out of the battery core, wherein the outside of the battery is covered with the insulating film for heat conduction of the battery according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010876119.0A CN112072205A (en) | 2020-08-26 | 2020-08-26 | Insulating film for battery heat conduction and battery thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010876119.0A CN112072205A (en) | 2020-08-26 | 2020-08-26 | Insulating film for battery heat conduction and battery thereof |
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| Publication Number | Publication Date |
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| CN112072205A true CN112072205A (en) | 2020-12-11 |
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| CN202010876119.0A Pending CN112072205A (en) | 2020-08-26 | 2020-08-26 | Insulating film for battery heat conduction and battery thereof |
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| CN (1) | CN112072205A (en) |
Cited By (2)
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| CN111916874A (en) * | 2020-09-08 | 2020-11-10 | 天合光能股份有限公司 | Battery heat conduction structure and battery module |
| CN115149141A (en) * | 2021-03-30 | 2022-10-04 | 宁德新能源科技有限公司 | Battery and electric equipment |
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