CN220400735U - Battery cover plate and battery - Google Patents
Battery cover plate and battery Download PDFInfo
- Publication number
- CN220400735U CN220400735U CN202321711071.3U CN202321711071U CN220400735U CN 220400735 U CN220400735 U CN 220400735U CN 202321711071 U CN202321711071 U CN 202321711071U CN 220400735 U CN220400735 U CN 220400735U
- Authority
- CN
- China
- Prior art keywords
- explosion
- cover plate
- battery
- proof valve
- proof
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000001681 protective effect Effects 0.000 claims abstract description 40
- -1 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006295 polythiol Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
In order to overcome the problems that the pressure required by rupture of an explosion-proof valve is increased and the explosion-proof function of the explosion-proof valve is affected due to the existence of a protective film at present, the utility model provides a battery cover plate and a battery, the battery cover plate comprises a cover plate body, the explosion-proof valve and the protective film, the cover plate body is provided with explosion-proof holes, the explosion-proof valve is arranged in the explosion-proof holes, the surface of one side of the explosion-proof holes, which is away from a battery shell, is adhered with the protective film, the protective film and the explosion-proof valve are arranged at intervals, a cavity is formed between the explosion-proof valve and the protective film, an exhaust structure is arranged at the joint of the explosion-proof holes and the protective film, and the exhaust structure is used for balancing the air pressure between the cavity and an external space; according to the utility model, the exhaust structure is arranged at the joint of the explosion-proof valve and the cover plate body and is communicated with the outside, so that the pressure of the cavity is the same as the external pressure, the actual rupture pressure of the explosion-proof valve is the same as the set rupture pressure, and the influence of the air pressure between the protective film and the explosion-proof valve on the explosion-proof function of the explosion-proof valve when the explosion-proof valve bulges and ruptures is avoided.
Description
Technical Field
The utility model relates to the technical field of secondary batteries, in particular to a battery cover plate and a battery.
Background
After thermal runaway, the battery generates a mixed substance containing a large amount of combustible gas, and increases the pressure in the battery. When a certain pressure is reached, the explosion-proof valve is opened to spray. At present, the surface of the explosion-proof valve is provided with a protective film, the protective film plays a role in protecting the explosion-proof valve, and the pollution to the explosion-proof valve caused by components such as external electrolyte or moisture is avoided, so that the explosion-proof valve is invalid due to corrosion.
However, the rupture pressure of the existing explosion-proof valve is set, and when the internal pressure of the battery reaches the rated pressure of the explosion-proof valve, the explosion-proof valve is ruptured to release the pressure; however, since the protection film is provided on the surface of the explosion-proof valve, a sealed space is formed between the protection film and the explosion-proof valve, which is equivalent to sealing the outside of the explosion-proof valve, thereby increasing the pressure required for cracking the explosion-proof valve and affecting the explosion-proof function of the explosion-proof valve. Therefore, how to overcome the above-mentioned technical problems and drawbacks becomes an important problem to be solved.
Disclosure of Invention
Aiming at the problem that the explosion-proof function of the explosion-proof valve is affected by increasing the pressure required by the explosion-proof valve due to the existence of a protective film at present, the utility model provides a battery cover plate and a battery.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a battery cover plate, which is used for sealing a battery shell to form a battery, and comprises a cover plate body, an explosion-proof valve and a protective film, wherein the cover plate body is provided with the explosion-proof hole, the explosion-proof valve is arranged in the explosion-proof hole, the protective film is adhered to the surface of one side, away from the battery shell, of the explosion-proof hole, the protective film and the explosion-proof valve are arranged at intervals, so that a cavity is formed between the explosion-proof valve and the protective film, an exhaust structure is arranged at the joint of the explosion-proof hole and the protective film, and the exhaust structure is used for balancing the air pressure between the cavity and an external space.
Optionally, the exhaust structure is disposed on a surface of the cover body facing away from the battery case.
Optionally, the exhaust structure is a groove structure disposed on the surface of the cover plate body.
Optionally, the exhaust structure is the bar groove, the protection film part shields the bar groove, the one end intercommunication of bar groove the lateral wall of cavity, the other end in bar groove is along keeping away from the direction of cavity extends and extends the coverage of protection film.
Optionally, the cross section of the strip-shaped groove is V-shaped, and the width and the depth of the exhaust structure gradually decrease along the direction away from the cavity.
Optionally, the protection film is provided with an exhaust hole, and the exhaust hole is communicated with the two side surfaces of the protection film.
Optionally, the material of the protective film is selected from one of polyethylene terephthalate (PET), polypropylene (PP) and Polycarbonate (PC).
Optionally, the outer edge of the protective film is adhered to the outer edge of the explosion-proof hole.
Optionally, the cover plate body is provided with a liquid injection hole.
In another aspect, the utility model provides a battery comprising a battery housing and a battery cover as described above.
According to the battery cover plate provided by the utility model, the protective film is arranged on the surface of the explosion-proof valve, so that the protective film plays a role in protecting the explosion-proof valve, and the pollution of components such as external electrolyte or moisture to the explosion-proof valve is avoided, so that the explosion-proof valve is prevented from being corroded to fail. Secondly, when the internal short circuit of the battery or other thermal runaway conditions occur, the weak notch of the explosion-proof valve is broken for exhausting gas due to the increase of the internal air pressure of the battery, so that explosion caused by the overlarge internal air pressure of the battery is avoided; secondly, through being equipped with exhaust structure in explosion-proof valve and apron body handing-over department, exhaust structure and external intercommunication make the pressure between explosion-proof valve and the protection film the same with external pressure to make the rupture pressure of explosion-proof valve still the same with the pressure that sets for, therefore, exhaust structure's setting can avoid explosion-proof valve bulge to rupture between protection film and the explosion-proof valve to the influence of explosion-proof function of explosion-proof valve.
Drawings
FIG. 1 is an exploded view of a battery cover plate according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an exhaust structure according to an embodiment of the present utility model;
fig. 3 is a schematic structural view of a protective film according to an embodiment of the present utility model;
FIG. 4 is a schematic cross-sectional view of a battery cover plate according to an embodiment of the present utility model;
FIG. 5 is an enlarged schematic view of a portion of FIG. 4A;
reference numerals in the drawings of the specification are as follows:
1-a cover plate body; 11-explosion-proof holes; 12-an exhaust structure; 13-an explosion-proof valve; 14-filling holes; 15-a cavity; 2-a protective film; 21-exhaust hole.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "side", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the term "connected" should be interpreted broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, 4 and 5, in one aspect, the present utility model provides a battery cover for closing a battery case to form a battery, the battery cover includes a cover body 1, an explosion-proof valve 13 and a protection film 2, the cover body 1 is provided with the explosion-proof hole 11, the explosion-proof valve 13 is disposed in the explosion-proof hole 11, a protection film 2 is adhered to a surface of one side of the explosion-proof hole 11 facing away from the battery case, the protection film 2 and the explosion-proof valve 13 are disposed at intervals, so that a cavity 15 is formed between the explosion-proof valve 13 and the protection film 2, an exhaust structure 12 is disposed at a junction between the explosion-proof hole 11 and the protection film 2, and the exhaust structure 12 is used for balancing air pressure between the cavity 15 and an external space.
Specifically, the protection film 2 is arranged on the surface of the explosion-proof valve 13, the protection film 2 plays a role in protecting the explosion-proof valve 13, and pollution to the explosion-proof valve 13 caused by components such as external electrolyte or moisture is avoided, so that the explosion-proof valve 13 is corroded to fail. Second, when the battery is internally shorted or in other thermal runaway conditions, an increase in the internal gas pressure of the battery may fracture the weak score of the explosion-proof valve 13 for exhausting the gas, thereby avoiding explosion caused by the excessive internal gas pressure of the battery.
The burst pressure of the existing explosion-proof valve 13 is set, and when the internal pressure of the battery reaches the rated pressure of the explosion-proof valve 13, the explosion-proof valve 13 bursts to release the pressure; however, since the protection film 2 is provided on the surface of the explosion-proof valve 13, a sealed space is formed between the protection film 2 and the explosion-proof valve 13, which corresponds to sealing the outside of the explosion-proof valve 13, so that the pressure required for cracking the explosion-proof valve 13 is increased, and the exhaust structure 12 is provided at the junction of the explosion-proof valve 13 and the cover plate body 1, the exhaust structure 12 is communicated with the outside, so that the pressure between the explosion-proof valve 13 and the protection film 2 is the same as the outside pressure, and the cracking pressure of the explosion-proof valve 13 is the same as the set pressure, and the arrangement of the exhaust structure 12 can avoid the influence of the air pressure between the protection film 2 and the explosion-proof valve 13 on the explosion-proof function of the explosion-proof valve 13 when the explosion-proof valve 13 bulges and cracks.
As shown in fig. 2, in one embodiment, the exhaust structure 12 is provided on the surface of the cover body 1 on the side facing away from the battery case; the exhaust structure 12 is communicated with the outside, so that the pressure between the explosion-proof valve 13 and the protection film 2 is the same as the outside pressure, and the rupture pressure of the explosion-proof valve 13 is further the same as the set pressure, therefore, the arrangement of the exhaust structure 12 can avoid the influence of the air pressure between the protection film 2 and the explosion-proof valve 13 on the explosion-proof function of the explosion-proof valve 13 when the explosion-proof valve 13 bulges and ruptures.
As shown in fig. 2, in an embodiment, the exhaust structure 12 is a groove structure disposed on the surface of the cover plate body 1, and the groove structure enables the exhaust structure 12 to be communicated with the outside, so as to balance the air pressure between the outside air pressure and the air pressure between the protection film 2 and the explosion-proof valve 13, and the groove structure can avoid the influence of the air pressure between the protection film 2 and the explosion-proof valve 13 on the explosion-proof function of the explosion-proof valve 13 when the explosion-proof valve 13 bulges and breaks.
As shown in fig. 2, in one embodiment, the exhaust structure 12 is a bar-shaped groove, the protection film 2 partially shields the bar-shaped groove, one end of the bar-shaped groove is communicated with the side wall of the cavity 15, and the other end of the bar-shaped groove extends in a direction away from the cavity 15 and extends out of the coverage area of the protection film 2.
Specifically, the outer edge of the protective film 2 is adhered to the outer edge of the explosion-proof hole 11, so that the protective film 2 partially shields the strip-shaped groove, and the protective film 2 and the battery cover plate can be integrated; the other end of the strip-shaped groove extends along the direction away from the cavity 15 and extends out of the coverage area of the protection film 2, so that the strip-shaped groove is conveniently communicated with the outside, the air pressure between the outside air pressure and the cavity 15 is balanced, and the influence of the air pressure between the protection film 2 and the explosion-proof valve 13 on the explosion-proof function of the explosion-proof valve 13 when the explosion-proof valve 13 bulges and breaks can be avoided by the groove structure.
As shown in fig. 2, in an embodiment, the cross section of the bar-shaped groove is V-shaped, and the width and depth of the exhaust structure 12 gradually decrease along the direction away from the cavity 15, so as to accelerate the flow rate of the gas, and facilitate timely explosion when the explosion-proof valve 13 reaches the rated pressure, and release the pressure in the battery.
As shown in fig. 3, in one embodiment, the protection film 2 is provided with air vents 21, and the air vents 21 are communicated with two side surfaces of the protection film 2; at present, an air hole is usually formed at the upper end of the protective film 2 to facilitate the discharge of air.
Further, the thickness of the protective film 2 is 100 μm to 300 μm; when the thickness of the protection film 2 is in the above range, on the one hand, it is advantageous to ensure the sealing connection effect thereof, and on the other hand, it is also avoided that the exhaust hole 21 of the protection film 2 is not easily opened due to the excessive thickness, which adversely affects the exhaust of the battery.
As shown in fig. 3, in an embodiment, the material of the protective film 2 is selected from one of polyethylene terephthalate (PET), polypropylene (PP) and Polycarbonate (PC).
Specifically, the protection film 2 provided by the application is an insulating protection film 2 with high weather resistance and high heat conduction, and can reduce the risk of thermal runaway of the battery and prolong the service life of the battery.
Further, the protective film 2 is insulating transparent plastic. The material can prevent electricity and has light weight, and meanwhile, the condition of the explosion-proof valve 13 can be conveniently observed.
Preferably, the protective film 2 is a PET film, which has good flexibility and high transparency, and also has excellent heat resistance, cold resistance and corrosion resistance. Of course, other insulating transparent plastics such as PP film, PC film or PE film may be used for the protective film 2.
In other embodiments, the protective film 2 may be made of other materials, such as polyethylene, polyethylene terephthalate, polythioether, and the like.
As shown in fig. 4 to 5, in one embodiment, the outer edge of the protection film 2 is adhered to the outer edge of the explosion-proof hole 11, so that the protection film 2 is integrated with the battery cover plate, and a cavity 15 is formed between the explosion-proof valve 13 and the protection film 2.
As shown in fig. 1, in one embodiment, the cover body 1 is provided with a liquid injection hole 14.
The liquid injection hole 14 is used for injecting electrolyte into the battery, the electrolyte enters the inner cavity of the battery shell through the liquid injection hole 14, the liquid injection hole 14 is closed after the liquid injection or formation is finished, and the closing mode can be performed by welding a cover plate or arranging an openable cover plate.
In another embodiment, the present application provides a battery, which includes a battery case and the battery cover described above.
In some embodiments, the battery housing is a square housing, a cylindrical housing, a prismatic housing, or other irregular housing.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (9)
1. A battery cover plate, characterized in that: the battery cover plate is used for sealing the battery shell to form a battery, the battery cover plate comprises a cover plate body, an explosion-proof valve and a protective film, explosion-proof holes are formed in the cover plate body, the explosion-proof valve is arranged in the explosion-proof holes, the protective film is adhered to the surface of one side, away from the battery shell, of the explosion-proof holes, the protective film and the explosion-proof valve are arranged at intervals, a cavity is formed between the explosion-proof valve and the protective film, an exhaust structure is arranged at the joint of the explosion-proof holes and the protective film, and the exhaust structure is used for balancing air pressure between the cavity and an external space; the protective film is provided with an exhaust hole, and the exhaust hole is communicated with the two side surfaces of the protective film.
2. The battery cover plate according to claim 1, wherein: the exhaust structure is arranged on the surface of one side, away from the battery shell, of the cover plate body.
3. The battery cover plate according to claim 2, wherein: the exhaust structure is a groove structure arranged on the surface of the cover plate body.
4. A battery cover plate according to claim 3, wherein: the exhaust structure is a strip-shaped groove, the protection film partially shields the strip-shaped groove, one end of the strip-shaped groove is communicated with the side wall of the cavity, and the other end of the strip-shaped groove extends along the direction away from the cavity and extends out of the coverage area of the protection film.
5. The battery cover plate of claim 4, wherein: the cross section of the strip-shaped groove is V-shaped, and the width and the depth of the exhaust structure are gradually reduced along the direction away from the cavity.
6. The battery cover plate according to claim 1, wherein: the material of the protective film is selected from one of polyethylene terephthalate (PET), polypropylene (PP) and Polycarbonate (PC).
7. The battery cover plate according to claim 1, wherein: the outer edge of the protective film is adhered to the outer edge of the explosion-proof hole.
8. The battery cover plate according to claim 1, wherein: the cover plate body is provided with a liquid injection hole.
9. A battery, characterized in that: the battery comprises a battery case and a battery cover plate according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321711071.3U CN220400735U (en) | 2023-06-30 | 2023-06-30 | Battery cover plate and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321711071.3U CN220400735U (en) | 2023-06-30 | 2023-06-30 | Battery cover plate and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220400735U true CN220400735U (en) | 2024-01-26 |
Family
ID=89603134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321711071.3U Active CN220400735U (en) | 2023-06-30 | 2023-06-30 | Battery cover plate and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220400735U (en) |
-
2023
- 2023-06-30 CN CN202321711071.3U patent/CN220400735U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |