CN216648357U - A electric core pole piece structure and battery for improving heat abuse inefficacy - Google Patents
A electric core pole piece structure and battery for improving heat abuse inefficacy Download PDFInfo
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- CN216648357U CN216648357U CN202122522387.5U CN202122522387U CN216648357U CN 216648357 U CN216648357 U CN 216648357U CN 202122522387 U CN202122522387 U CN 202122522387U CN 216648357 U CN216648357 U CN 216648357U
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- pole piece
- phase change
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- 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
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Abstract
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery cell pole piece structure for improving heat abuse failure and a battery, which comprise a pole piece body (1), wherein a foil area (11) is arranged on the pole piece body (1); the tab (2) is arranged on the surface of the foil area (11); the energy storage phase change layer (3) covers the surface of the tab (2); and the insulating gummed paper (4) covers the surface of the energy storage phase change layer (3). According to the utility model, through optimizing the structure of the battery core pole piece and through the energy storage phase change layer, the probability and degree of diaphragm shrinkage are reduced by absorbing heat at high temperature, and the problem of tab position adhesive paper melting is solved, so that the problem of battery thermal abuse failure is improved.
Description
Technical Field
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery cell pole piece structure for improving heat abuse failure and a battery.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
The soft package lithium ion battery generally comprises a positive electrode, a negative electrode, a diaphragm, electrolyte and an aluminum plastic film. The point with the highest temperature in the charging and discharging process is generally at the pole ear position, especially the pole ear position of the negative pole. When the charging and discharging heat generation is too high or the heat abuse fails, the diaphragm shrinks, and the adhesive paper at the tab position melts to cause short circuit, so that the safety problem is caused.
SUMMERY OF THE UTILITY MODEL
One of the objects of the present invention is: to the not enough of prior art, provide a battery pole piece structure for improving heat abuse inefficacy, through optimizing battery pole piece structure, through energy storage phase change layer, the high temperature heat absorption reduces the probability and the degree of diaphragm shrink, can also solve the problem that utmost point ear position adhesive tape melts to improve the problem that battery heat abuse became invalid.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a cell pole piece structure for improving heat abuse failure comprises a pole piece body, wherein a foil area is arranged on the pole piece body; the tab is arranged on the surface of the foil area; the energy storage phase change layer covers the surface of the pole lug; and the insulating gummed paper covers the surface of the energy storage phase change layer.
Preferably, the energy storage phase change layer comprises paraffin, polyethylene wax, stearic acid, graphite, graphene, bentonite or silicon dioxide.
Preferably, the shape of the energy storage phase change layer and the shape of the insulating gummed paper are square.
Preferably, the pole piece further comprises an isolation film, and the isolation film is arranged between the two pole piece bodies with different polarities.
Preferably, the tab is provided with a first surface and a second surface, the first surface is fixedly connected with the foil area, and the energy storage phase change layer is attached to the second surface.
Preferably, the area of the insulating gummed paper is larger than that of the energy storage phase change layer.
Preferably, the energy storage phase change layer and the insulating gummed paper are of an integrated structure.
Preferably, the pole piece body is further provided with a coating area, and the coating area is adjacent to the foil area.
Preferably, the foil region is arranged at the end or in the middle of the pole piece body.
The utility model also aims to provide a battery, which comprises the battery cell pole piece structure for improving the heat abuse failure.
The utility model has the beneficial effects that the utility model comprises a pole piece body, wherein a foil area is arranged on the pole piece body; the tab is arranged on the surface of the foil area; the energy storage phase change layer covers the surface of the tab; and the insulating gummed paper covers the surface of the energy storage phase change layer. When the charging and discharging heat production is too high or the heat abuse fails, the diaphragm contracts, the tab position adhesive paper melts to cause short circuit, and the safety problem is caused, so that the tab is welded on the pole piece body, the energy storage phase change layer is arranged between the tab and the insulating adhesive paper, the energy storage phase change layer is arranged on the surface of the tab, the tab can intelligently absorb heat and cool when reaching high temperature, the contraction of the diaphragm is reduced, the melting probability of the tab position adhesive paper is reduced, and the problem of the heat abuse failure is solved; when the temperature is reduced to the allowed lower limit temperature, the energy storage phase change layer is solidified and releases heat, so that the reduction of the surface temperature is delayed, the capability of resisting high-load thermal shock of the battery can be effectively improved, and the reliability and the stability of the operation of the battery are ensured. According to the utility model, through optimizing the structure of the battery core pole piece and through the energy storage phase change layer, the probability and degree of diaphragm shrinkage are reduced by absorbing heat at high temperature, and the problem of tab position adhesive paper melting is solved, so that the problem of battery thermal abuse failure is improved.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic view of the installation of the energy storage phase change layer and the insulating adhesive paper according to the first embodiment of the utility model.
Fig. 3 is a schematic view of the mounting of the isolation diaphragm according to the first embodiment of the present invention.
Fig. 4 is a schematic view of the installation of the energy storage phase change layer and the insulating adhesive paper according to the second embodiment of the utility model.
Wherein the reference numerals are as follows:
1-pole piece body; 11-a foil region; 12-a coating zone;
2-pole ear;
3-energy storage phase change layer;
4-insulating gummed paper;
5-isolation film.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1 to 3, but the present invention is not limited thereto.
Implementation mode one
The first embodiment will be described with reference to the accompanying drawings 1 to 3
The battery pole piece structure for improving the heat abuse failure comprises a pole piece body 1, wherein a foil area 11 is arranged on the pole piece body 1; the tab 2 is arranged on the surface of the foil area 11; the energy storage phase change layer 3 covers the surface of the tab 2; and the insulating adhesive paper 4 covers the surface of the energy storage phase change layer 3.
When the charging and discharging heat production is too high or the heat abuse fails, the diaphragm shrinks, the tab position adhesive paper melts to cause short circuit, and the safety problem is caused, therefore, the tab 2 is welded on the pole piece body 1, the energy storage phase change layer 3 is arranged between the tab 2 and the insulating adhesive paper 4, the energy storage phase change layer 3 is arranged on the surface of the tab 2, the problem of heat abuse failure is improved by intelligently absorbing heat and reducing temperature when the high temperature is reached, the diaphragm shrinkage is reduced or reduced, and the probability of melting of the tab position adhesive paper is reduced, in addition, when the surface temperature of the battery rises to the allowed upper limit temperature, the energy storage phase change layer 3 melts and absorbs heat, so that the rise of the surface temperature is delayed; and when the temperature drops to the lower limit temperature that allows, energy storage phase change layer 3 solidifies and releases the heat to delay the decline of surface temperature, can effectively improve the ability that the battery resisted the high load thermal shock, guaranteed the reliability and the stability of battery operation, wherein, insulating adhesive tape 4 covers the surface at energy storage phase change layer 3, plays insulating utmost point ear 2 and the effect of protection energy storage phase change layer 3.
In the present embodiment, the material of the energy storage phase change layer 3 is a substance that changes the state of a substance and can provide latent heat without changing the temperature. The process of changing physical properties is called a phase change process, and in this case, the phase change material absorbs or releases a large amount of latent heat.
In the cell pole piece structure for improving thermal abuse failure according to the utility model, the energy storage phase change layer 3 comprises paraffin, polyethylene wax, stearic acid, graphite, graphene, bentonite or silicon dioxide. Specifically, the material of the energy storage phase change layer 3 mainly includes paraffin, polyethylene wax, stearic acid and their composite materials with graphite, graphene, bentonite, silicon dioxide, etc.
In the cell pole piece structure for improving the heat abuse failure, the energy storage phase change layer 3 and the insulating gummed paper 4 are square. The shapes of the energy storage phase change layer 3 and the insulating gummed paper 4 can be adjusted according to the shape of the actual tab 2, and are preferably square.
In the cell pole piece structure for improving the thermal abuse failure, the utility model further comprises a separation film 5, and the separation film 5 is arranged between the two pole piece bodies 1 with different polarities. The isolating film 5 separates the two pole piece bodies 1 with different polarities, so that the probability of short circuit between the pole piece bodies 1 is reduced, and the safety of the battery cell is improved.
In the battery cell pole piece structure for improving the thermal abuse failure, the tab 2 is provided with a first surface and a second surface, the first surface is fixedly connected with the foil area 11, and the energy storage phase change layer 3 is attached to the second surface. The first surface and the second surface are opposite, the first surface is fixedly connected with the foil region 11 through welding, and the energy storage phase change layer 3 is fixedly connected with the second surface through bonding.
In the cell pole piece structure for improving the thermal abuse failure, the area of the insulating gummed paper 4 is larger than that of the energy storage phase change layer 3, so that the effect of protecting and fixing the energy storage phase change layer 3 is achieved.
In the cell pole piece structure for improving thermal abuse failure according to the utility model, the pole piece body 1 is further provided with a coating area 12, the coating area 12 is adjacent to a foil area 11, and the foil area 11 is arranged at the end or in the middle of the pole piece body 1. The foil area 11 is a metal foil exposed on the pole piece body 1, and the coating area 12 is formed by coating active substances on the metal foil to participate in chemical reaction of the battery.
The working principle of the utility model is as follows:
the pole lug 2 is welded on the pole piece body 1, the energy storage phase change layer 3 is arranged between the pole lug 2 and the insulating adhesive tape 4, the energy storage phase change layer 3 is arranged on the surface of the pole lug 2, the intelligent heat absorption and cooling are realized when the high temperature is reached, the contraction of the diaphragm is reduced or reduced, the melting probability of the adhesive tape at the pole lug position is reduced, and the problem of heat abuse failure is solved; and when the temperature drops to the lower limit temperature that allows, energy storage phase change layer 3 solidifies and releases the heat to delay the decline of surface temperature, can effectively improve the ability that the battery resisted the high load thermal shock, guaranteed the reliability and the stability of battery operation, wherein, insulating adhesive tape 4 covers the surface at energy storage phase change layer 3, plays insulating utmost point ear 2 and the effect of protection energy storage phase change layer 3.
After the pole lug 2 is welded on the pole piece body 1, the energy storage phase change layer 3 is covered on the pole lug 2, and then the pole lug is fixed on the energy storage phase change layer 3 by sticking the insulating gummed paper 4.
Second embodiment
The difference from the first embodiment is that: the energy storage phase change layer 3 and the insulating adhesive tape 4 of the embodiment are of an integrated structure. Specifically, after the energy storage phase change layer 3 is adhered to the insulating adhesive tape 4, an integrated structure is formed and then covers the tab 2 of the pole piece body 1, which is beneficial to simplifying the installation steps.
Other structures are the same as those of the first embodiment, and are not described herein again.
Battery with a battery cell
The utility model includes the cell pole piece structures of embodiments one-two for improving heat abuse failure.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A cell pole piece structure for ameliorating heat abuse failures, comprising:
the pole piece comprises a pole piece body (1), wherein a foil area (11) is arranged on the pole piece body (1);
the tab (2) is arranged on the surface of the foil area (11);
the energy storage phase change layer (3) covers the surface of the tab (2);
and the insulating gummed paper (4) covers the surface of the energy storage phase change layer (3).
2. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: utmost point ear (2) are provided with first surface and second surface, the first surface with foil district (11) fixed connection, energy storage phase change layer (3) with the laminating of second surface.
3. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: the area of the insulating gummed paper (4) is larger than that of the energy storage phase change layer (3).
4. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: the energy storage phase change layer (3) and the insulating gummed paper (4) are of an integrated structure.
5. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: the energy storage phase change layer (3) comprises paraffin, polyethylene wax, stearic acid, graphite, graphene, bentonite or silicon dioxide.
6. The cell pole piece structure for ameliorating thermal abuse failure of claim 1, wherein: the shape of the energy storage phase change layer (3) and the shape of the insulating gummed paper (4) are square.
7. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: the pole piece is characterized by further comprising an isolation film (5), wherein the isolation film (5) is arranged between the two pole piece bodies (1) with different polarities.
8. The cell pole piece structure for ameliorating heat abuse failure of claim 1, wherein: the pole piece body (1) is further provided with a coating area (12), and the coating area (12) is adjacent to the foil area (11).
9. The cell pole piece structure for ameliorating thermal abuse failure of claim 1, wherein: the foil area (11) is arranged at the end or in the middle of the pole piece body (1).
10. A battery comprising the cell pole piece structure of any one of claims 1 to 9 for ameliorating heat abuse failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122522387.5U CN216648357U (en) | 2021-10-20 | 2021-10-20 | A electric core pole piece structure and battery for improving heat abuse inefficacy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122522387.5U CN216648357U (en) | 2021-10-20 | 2021-10-20 | A electric core pole piece structure and battery for improving heat abuse inefficacy |
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| CN216648357U true CN216648357U (en) | 2022-05-31 |
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| CN202122522387.5U Active CN216648357U (en) | 2021-10-20 | 2021-10-20 | A electric core pole piece structure and battery for improving heat abuse inefficacy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116759574A (en) * | 2023-08-16 | 2023-09-15 | 深圳海辰储能控制技术有限公司 | Negative electrode material, negative electrode plate, preparation method of negative electrode plate and lithium battery |
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2021
- 2021-10-20 CN CN202122522387.5U patent/CN216648357U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116759574A (en) * | 2023-08-16 | 2023-09-15 | 深圳海辰储能控制技术有限公司 | Negative electrode material, negative electrode plate, preparation method of negative electrode plate and lithium battery |
| CN116759574B (en) * | 2023-08-16 | 2024-01-26 | 深圳海辰储能控制技术有限公司 | Negative electrode material, negative electrode plate, preparation method of negative electrode plate and lithium battery |
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