CN215771433U - Explosion-proof device for power battery - Google Patents
Explosion-proof device for power battery Download PDFInfo
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- CN215771433U CN215771433U CN202122199997.6U CN202122199997U CN215771433U CN 215771433 U CN215771433 U CN 215771433U CN 202122199997 U CN202122199997 U CN 202122199997U CN 215771433 U CN215771433 U CN 215771433U
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- hole
- protective film
- explosion
- protection film
- cover plate
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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 relates to a power battery explosion-proof equipment, including apron, explosion-proof piece and protection film, seted up vertical through-hole on the apron, at vertical through-hole fixed surface connection explosion-proof piece, at apron vertical through-hole upper surface fixed surface connection protection film. The protection film includes protection film plane portion, protection film bellying through-hole, protection film plane portion covers the vertical through-hole upper surface of apron, the protection film bellying is located protection film plane portion central zone, and the orientation is for deviating from apron upper surface direction, protection film bellying through-hole is located protection film bellying top plane central zone is through designing protection film bellying, and protection film bellying through-hole is located protection film bellying top plane has solved the problem of electrolyte pollution explosion-proof piece.
Description
Technical Field
The utility model relates to the field of electrochemical energy storage devices, in particular to an explosion-proof device for a power battery.
Background
The power battery material is sensitive to moisture and oxygen and is generally designed into a sealing structure. The power battery has high energy density and flammable electrolyte, and an explosion-proof device is usually designed for improving the safety performance of the power battery.
The disclosed explosion-proof device for power battery is to punch a longitudinal through hole on the cover plate of the power battery. And welding an explosion-proof sheet on the lower surface of the longitudinal through hole of the cover plate, and bonding a protective film on the upper surface of the longitudinal through hole of the cover plate. The explosion-proof sheet, the cover plate longitudinal through hole and the protective film form a closed cavity.
In order to inspect the welding quality of the explosion-proof sheet and the cover plate on the power battery manufacturing production line and avoid the problem of protective film collapse caused by the pressure difference between the inside and the outside of the closed cavity formed by the explosion-proof sheet, the longitudinal through hole of the cover plate and the protective film in the power battery manufacturing process, a scheme that through holes or gaps are designed on the peripheries of the closed cavity formed by the explosion-proof sheet, the longitudinal through hole of the cover plate and the protective film to form a semi-closed cavity is disclosed.
In the existing published scheme, the problems that electrolyte enters the semi-closed cavity through a through hole or a gap on the periphery of the semi-closed cavity and pollutes the explosion-proof sheet exist.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the electrolyte pollutes the explosion-proof sheet, the utility model discloses an explosion-proof device of a power battery, which adopts the following technical scheme:
the explosion-proof device comprises a cover plate, an explosion-proof sheet and a protective film, wherein a cover plate longitudinal through hole is formed in the cover plate, the lower surface of the cover plate longitudinal through hole is fixedly connected with the explosion-proof sheet, and the upper surface of the cover plate longitudinal through hole is fixedly connected with the protective film.
The protection film includes protection film plane portion, protection film bellying through-hole, protection film plane portion covers the vertical through-hole upper surface of apron, the protection film bellying is located protection film plane portion central zone, and the orientation is for deviating from apron upper surface direction, protection film bellying through-hole is located protection film bellying top plane central zone.
And a protective film bulge cavity is formed inside the protective film bulge and forms a semi-closed cavity together with the cover plate longitudinal through hole.
The shape of the convex part of the protective film is in a circular truncated cone shape, a cylindrical shape, a semicircular shape or a prismatic shape.
Preferably, the height of the protruding part of the protective film is 0.5-5.0 mm.
Preferably, the diameter of the through hole of the bulge part of the protective film is 0.2-3.0 mm.
The utility model has the beneficial effects that: the protection film bulge is designed, and the through hole of the protection film bulge is positioned on the plane of the top of the protection film bulge, so that the problem that the electrolyte pollutes the explosion-proof sheet is solved from two aspects, one is that the height of the protection film through hole and the plane of the cover plate is increased, the protection film through hole is kept to exceed the height of the electrolyte level overflowing from the electrolyte injection hole of the cover plate, and the electrolyte is prevented from flowing into or permeating into the semi-closed cavity of the explosion-proof device through the protection film through hole to pollute the explosion-proof valve; and secondly, the area of the plane where the through hole of the protective film is located is reduced, the probability that the splashed electrolyte falls on the plane of the through hole of the protective film during operation failures such as pressure injection of the electrolyte, negative pressure formation of pressure release and the like in the power battery manufacturing process is reduced, and the splashed electrolyte is prevented from falling into a semi-closed cavity of the explosion-proof device and polluting an explosion-proof valve through the through hole of the protective film.
Drawings
FIG. 1: the section structure schematic diagram of the power battery explosion-proof device provided by the embodiment 1 of the application.
FIG. 2: the structural schematic diagram of the service condition of the power battery explosion-proof device provided by the embodiment 1 of the application.
FIG. 3: the section structure schematic diagram of the power battery explosion-proof device provided by the embodiment 2 of the application.
In the figure, a cover plate 1, a first pole post 2, a second pole post 3, a liquid injection hole 4, an explosion-proof sheet 5, a protective film 6, a cover plate longitudinal through hole 7, a protective film convex part cavity 8, a semi-closed cavity 78, a protective film plane part 60, a protective film convex part 61 and a protective film convex part through hole 62.
Detailed Description
The utility model and its advantages are explained in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1: the section structure schematic diagram of the power battery explosion-proof device provided by the embodiment 1 of the application and fig. 2: the structural schematic diagram of the service state of the power battery explosion-proof device provided in embodiment 1 of the present application, fig. 3: the schematic cross-sectional structure diagram of the power battery explosion-proof device provided in embodiment 2 of the present application illustrates a specific implementation manner of the power battery explosion-proof device provided in the present novel embodiment.
A first pole mounting hole, a second pole mounting hole, a liquid injection hole 4 and a cover plate longitudinal through hole 7 are processed and generated on the cover plate 1.
The cover plate 1 is provided with a first pole post 2 and a second pole post 3.
The explosion-proof piece 5 covers the lower surface of the cover plate longitudinal through hole 7, and the explosion-proof piece 5 is preferably connected with the cover plate 1 at the periphery of the cover plate longitudinal through hole 7 by laser welding.
The material of the protective film 6 may be polypropylene, and the processing method thereof is illustrated as follows:
referring to fig. 1: according to the schematic sectional structure of the power battery explosion-proof device provided by embodiment 1 of the application, the protective film is firstly stamped in the central area of the protective film to form the conical protective film protruding part, and then the conical tip part is cut off to form the protective film plane part 60, the protective film protruding part 61 with the shape of a truncated cone and the protective film protruding part through hole 62.
Referring to fig. 3: in the schematic sectional structure of the power battery explosion-proof device provided in embodiment 2 of the present application, the protective film is firstly stamped in the central region thereof to form the cylindrical protective film protrusion 61, the cylindrical protective film plane 60, and the protective film protrusion through hole 62.
Preferably, the height of the protection film protrusion 61 is 0.5 to 5.0 mm.
Preferably, the diameter of the protective film protrusion through hole 62 is 0.2 to 3.0 mm.
The protective film plane part 60 is punched and cut to be formed, the periphery of the protective film plane part is consistent with the longitudinal through hole of the cover plate, and the appearance size is larger.
The shape of the protection film protrusion 61 may be a semicircular shape or a prismatic shape, and the processing method is similar to that of the embodiment, and will not be described again.
The glue is coated on the periphery of the protective film plane part 60, the glue can be selected from polyacrylate, then the protective film 6 covers the upper surface of the cover plate longitudinal through hole 7, and the cover plate 1 is bonded together.
The cover plate longitudinal through hole 7 and the protection film bulge part cavity 8 are combined into a semi-closed cavity 78.
By utilizing the space channel formed by combining the semi-closed cavity 78 and the protective film protrusion through hole 62, the welding quality of the explosion-proof sheet and the cover plate can be tested in a helium detection mode and the like in the manufacturing process of the power battery, and the problem of the collapse of the protective film in the manufacturing process of the power battery can be avoided.
By designing the protective film bulge 61, and positioning the protective film bulge through hole 62 on the top plane of the protective film bulge 61, the problem that the electrolyte pollutes the explosion-proof sheet 5 is solved in two aspects, one is that the height of the protective film through hole and the plane of the cover plate 1 is increased, the protective film through hole is kept to exceed the height of the electrolyte level overflowing from the electrolyte injection hole 4 of the cover plate 1, and the electrolyte is prevented from flowing into or permeating into the semi-closed cavity 78 of the explosion-proof device through the protective film through hole to pollute the explosion-proof valve 5; secondly, the area of the plane where the through hole of the protection film is located is reduced, the probability that the electrolyte sputtering falls on the plane of the through hole of the protection film is reduced when the operations such as pressure injection of the electrolyte, negative pressure formation and pressure release are failed in the power battery manufacturing process, and the splashed electrolyte is prevented from falling into the semi-closed cavity 78 of the explosion-proof device through the through hole of the protection film and polluting the explosion-proof valve 5.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims 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.
The foregoing is considered as illustrative of the preferred embodiments of the utility model and is not to be construed as limiting the utility model in any way. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the utility model, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (4)
1. An explosion-proof device of a power battery comprises a protective film, a cover plate and an explosion-proof sheet, and is characterized in that the protective film comprises a plane part, a convex part and a convex part through hole, the plane part of the protective film covers the upper surface of the longitudinal through hole of the cover plate, the convex part of the protective film is positioned in the central area of the plane part of the protective film and faces away from the upper surface of the cover plate, and the convex part through hole of the protective film is positioned in the central area of the top plane of the convex part of the protective film; the cover plate is provided with a longitudinal through hole, the lower surface of the longitudinal through hole is fixedly connected with an explosion-proof sheet, and the upper surface of the longitudinal through hole is fixedly connected with a protective film; and a protective film bulge cavity is formed inside the protective film bulge and forms a semi-closed cavity together with the cover plate longitudinal through hole.
2. The explosion-proof device of claim 1, wherein the shape of the protrusion of the protective film is any one of a truncated cone shape, a cylindrical shape, a semicircular shape and a prismatic shape.
3. The explosion-proof device of claim 2, wherein the height of the protruding part of the protective film is 0.5-5.0 mm.
4. The explosion-proof device of claim 3, wherein the diameter of the through hole of the protruding part of the protective film is 0.2-3.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122199997.6U CN215771433U (en) | 2021-09-13 | 2021-09-13 | Explosion-proof device for power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122199997.6U CN215771433U (en) | 2021-09-13 | 2021-09-13 | Explosion-proof device for power battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215771433U true CN215771433U (en) | 2022-02-08 |
Family
ID=80086542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122199997.6U Active CN215771433U (en) | 2021-09-13 | 2021-09-13 | Explosion-proof device for power battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215771433U (en) |
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2021
- 2021-09-13 CN CN202122199997.6U patent/CN215771433U/en active Active
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