CN212161868U - Battery top cap subassembly and battery cell - Google Patents
Battery top cap subassembly and battery cell Download PDFInfo
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- CN212161868U CN212161868U CN202020597203.4U CN202020597203U CN212161868U CN 212161868 U CN212161868 U CN 212161868U CN 202020597203 U CN202020597203 U CN 202020597203U CN 212161868 U CN212161868 U CN 212161868U
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Abstract
The utility model discloses a battery top cover assembly and a single battery, wherein the battery top cover assembly comprises a top cover and an explosion-proof valve, the top cover is provided with an explosion-proof hole, and the top cover is used for sealing a shell; the explosion-proof valve is including strengthening boss and explosion-proof piece, strengthens the boss and encircles the setting of explosion-proof piece, and the thickness of strengthening the boss is greater than the explosion-proof piece, strengthens the boss and is connected with the top cap, and explosion-proof piece cap seal explosion-proof hole. The utility model discloses battery top cap subassembly increases the anti deformability of explosion-proof valve, can alleviate the influence that the top cap warp and lead to the fact the explosion-proof valve effectively, promotes the reliability of explosion-proof valve.
Description
Technical Field
The utility model relates to a battery top cap subassembly's technical field especially relates to a battery top cap subassembly and battery cell.
Background
The shell, the top cover and the matched sealing piece of the power battery form a closed space, and the closed space is internally provided with a roll core, electrolyte, active substances, an insulating film and other components and various substances required by electrochemical energy conversion. The battery core can slowly generate gas in the normal use process, the gas can be generated violently under some abuse working conditions (such as internal short circuit), the air pressure in the sealed space of the battery core rises continuously, the pressure-resistant limit of the joint of the shell and the top cover is limited, and if the internal pressure rises continuously, the explosion of the power battery can be caused when the internal pressure exceeds the pressure-resistant limit of the shell and the top cover, so that the safety risk is brought. Therefore, a safe and reliable explosion-proof valve needs to be designed, and the valve is opened by internal air pressure under a set condition to release internal air so as to avoid explosion of a power battery.
The current explosion-proof valve structure of commonly using is with a dull and stereotyped substrate middle zone processing attenuation, and the main problem of this kind of mode is that the explosion-proof valve is able to bear or endure mechanical pulling force, pressure performance relatively poor, and explosion-proof pressure of explosion-proof valve is unstable, influences power battery life-span and fail safe nature.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery top cap subassembly and battery cell are in order to solve the poor technical problem of battery cell explosion-proof ability.
In order to realize the purpose, the utility model adopts the following technical scheme: a battery top cap assembly is provided, the battery top cap assembly comprising:
the top cover is provided with an explosion-proof hole and is used for sealing the shell;
explosion-proof valve, including strengthening boss and explosion-proof piece, strengthen the boss and encircle the setting of explosion-proof piece, strengthen the thickness of boss and be greater than the explosion-proof piece, strengthen the boss and be connected with the top cap, explosion-proof piece cap seal explosion-proof hole.
Optionally, the reinforcing boss is welded to the top cover.
Optionally, the top cover is provided with a limiting groove around the explosion-proof hole, and the reinforcing boss is assembled in the limiting groove in a limiting mode.
Optionally, the reinforcing boss comprises a first convex part and a second convex part, the first convex part is arranged around the explosion-proof sheet, the first convex part is in limited assembly in the limiting groove, the first convex part is flush with the top cover, and the second convex part is arranged on the first convex part in a stacked mode.
Optionally, the thickness of the first convex part is larger than that of the explosion-proof sheet.
Optionally, the reinforcing boss further comprises a third convex portion, the third convex portion is arranged around the second convex portion and connected with the explosion-proof sheet, and the third convex portion sinks relative to the second convex portion to form a step structure.
Optionally, the top cover is provided with a chamfer at the edge of the limiting groove.
Optionally, the battery cover assembly further comprises a protection sheet attached to the reinforcing boss to cover the explosion-proof sheet.
Optionally, the thickness of the explosion-proof sheet is 0.4 mm to 1 mm, and the explosion-proof sheet is provided with a notch.
In order to realize the purpose, the utility model adopts the following technical scheme: provided is a unit cell including: electric core, casing and foretell battery top cap subassembly, electric core assembly in the casing, battery top cap subassembly closing cap casing.
The utility model discloses beneficial effect does: the battery top cap subassembly of this application includes top cap and explosion-proof valve, and explosion-proof valve is connected with the top cap as independent part.
The top cover covers the shell, and the top cover is provided with an explosion-proof hole which allows gas to flow out.
The explosion-proof valve is including strengthening boss and explosion-proof piece, strengthens the boss and encircles the setting of explosion-proof piece, strengthens the boss and is the ring-type, strengthens the boss and is connected with the top cap, and explosion-proof piece cap seal explosion-proof hole, and when pressure in the casing reached the limit, the gas in the casing broke explosion-proof piece and discharged to prevent the explosion of battery cell. The thickness of strengthening the boss is greater than the explosion-proof piece, wherein strengthens the boss and is used for promoting the anti outside mechanical force of explosion-proof piece and pulls and extruded performance, and then the protection explosion-proof piece does not receive external force to influence, and the explosion-proof piece keeps the stability of burst pressure, ensures can not cause the phenomenon that the explosion-proof piece opened in advance and shortens the battery cell life-span, also can avoid the potential safety hazard that the explosion-proof piece burst pressure is unusual to bring.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the previous developments of the present invention, the drawings used in the embodiments or the previous developments will be briefly described below, and it is obvious that the drawings in the following descriptions are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of an assembly structure of a unit cell provided in the present application;
FIG. 2 is a schematic view of an assembled structure of a battery top cap assembly provided herein;
FIG. 3 is a schematic diagram of an exploded view of a battery top cap assembly provided herein;
FIG. 4 is a schematic top view of the explosion-proof valve provided herein;
FIG. 5 is a schematic cross-sectional view of one embodiment in the direction III-III of FIG. 4 as provided herein;
fig. 6 is a schematic cross-sectional view of another embodiment in the direction III-III of fig. 4 provided herein.
The graphical notation is as follows:
battery top cover assembly 10 top cover 12 of single battery 100 cell shell 20
Explosion-proof valve 14 with explosion-proof hole 121 limiting groove 123 and chamfer 125
First convex part 143 and second convex part 144 of explosion-proof sheet 142 of reinforcing boss 141
Detailed Description
The description in the present application relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated.
Referring to fig. 1, fig. 1 is a schematic view illustrating an assembly structure of a unit battery 100 provided in the present application.
The battery cell 100 of the present application includes: the battery comprises a battery core (not shown in fig. 1), a casing 20 and a battery top cover assembly 10, wherein the battery core is an energy storage component, the battery core is assembled in the casing 20, the battery top cover assembly 10 covers the casing 20, and the battery top cover 12 is electrically connected with the battery core so as to assist electric energy to be led into the battery core and lead out energy in the battery core.
Referring to fig. 1 to 5, fig. 2 is an assembly structure diagram of a battery top cap assembly 10 provided in the present application, fig. 3 is an exploded structure diagram of the battery top cap assembly 10 provided in the present application, fig. 4 is a top structure diagram of an explosion-proof valve 14 provided in the present application, and fig. 5 is a cross-sectional diagram of an embodiment in a direction III-III in fig. 4 provided in the present application.
The battery top cap assembly 10 of the present application includes a top cap 12 and an explosion proof valve 14, the explosion proof valve 14 being connected as a separate component to the top cap 12.
The top cover 12 covers the shell 20, the top cover 12 is provided with an explosion-proof hole 121, and the explosion-proof hole 121 allows gas to flow out.
The explosion-proof valve 14 comprises a reinforcing boss 141 and an explosion-proof sheet 142, the reinforcing boss 141 is arranged around the explosion-proof sheet 142, the reinforcing boss 141 is annular, the reinforcing boss 141 is connected with the top cover 12, the explosion-proof sheet 142 covers the explosion-proof hole 121, and when the pressure in the shell 20 reaches a limit, gas in the shell 20 breaks through the explosion-proof sheet 142 and is discharged, so as to prevent the explosion of the single battery 100. Strengthen boss 141's thickness and be greater than explosion-proof piece 142, wherein strengthen boss 141 and be used for promoting explosion-proof piece 142 anti outside mechanical force and pull and extruded performance, and then protection explosion-proof piece 142 does not receive external force to influence, and explosion-proof piece 142 keeps the stability of burst pressure, ensures not to cause explosion-proof piece 142 to open the phenomenon that shortens the life-span of battery cell 100 in advance, also can avoid the potential safety hazard that explosion-proof piece 142 burst pressure brought unusually.
The thickness of the explosion-proof sheet 142 is 0.4 mm to 1 mm, for example, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., the thickness of the explosion-proof sheet 142 affects the maximum pressure that can be borne by itself, and the larger the thickness of the explosion-proof sheet 142 is, the larger the maximum pressure that can be borne by itself is, so the thickness of the explosion-proof sheet 142 is determined by the maximum pressure that is early warned by the single battery 100. The explosion-proof sheet 142 is provided with a notch which is beneficial to the explosion of the explosion-proof sheet 142, and the notch is opened under the set air pressure specification so that the explosion-proof hole 121 forms a pressure relief channel. The shape of the nick can be wave shape, triangle shape, circle shape, circular arc shape, etc. The score may be scored on either side of the rupture disc 142.
The reinforcing boss 141 is welded to the top cover 12, preferably by laser welding, although welding by means of carbon dioxide arc welding or the like is not excluded. The boss 141 structure is strengthened in this scheme can absorb some welding conducted heat when explosion-proof valve 14 and top cap 12 welding to and top cap 12 and casing 20 welding, and then reduces the influence of this kind of uncertain heat to explosion-proof piece 142, with the stability that promotes explosion-proof piece 142 burst pressure. Of course, the reinforcing bosses 141 and the top cover 12 may be connected by screws.
The top cover 12 is provided with a limiting groove 123 surrounding the explosion-proof hole 121, and the reinforcing boss 141 is limited and assembled in the limiting groove 123 to prevent the explosion-proof valve 14 from moving during welding.
The top cover 12 is provided with a chamfer 125 at the edge of the limiting groove 123, and the chamfer 125 can be a chamfer angle or a fillet so as to facilitate the guiding explosion-proof valve 14 to be installed in the limiting groove 123.
The reinforcing boss 141 comprises a first convex part 143 and a second convex part 144, the first convex part 143 is arranged around the explosion-proof sheet 142, the first convex part 143 is in limited fit in the limiting groove 123, the first convex part 143 is flush with the top cover 12, and the second convex part 144 is arranged on the first convex part 143 in a stacked mode. The explosion-proof valve 14 is designed as a single part, the first protrusion 143 is a circular plane, the first protrusion 143 is assembled with the limiting groove 123 of the top cover 12 and is flush with the top cover 12 to form a butt welding area, so that the accumulation and grinding of the welding materials are facilitated, and the welded first protrusion 143 and the top cover 12 form a complete sealing plane. The annular plane of the first protrusion 143 is inwardly directed to an annular second protrusion 144, the second protrusion 144 greatly improves the mechanical force resistance of the explosion-proof valve 14, and the inside of the second protrusion 144 is the explosion-proof vent area.
The thickness of the first protrusion 143 may be greater than the thickness of the rupture disk 142, thereby further enhancing the mechanical force resistance of the poppet explosion valve 14. Of course, in another embodiment, the thickness of the first protrusion 143 may be the same as the thickness of the explosion-proof plate 142, and in this case, the first protrusion 143 is mainly used to fix the explosion-proof valve 14 on the top cover 12.
Referring to fig. 6, fig. 6 is a schematic cross-sectional view of another embodiment in the direction III-III of fig. 4 according to the present application.
The reinforcing boss 141 further includes a third protrusion 145, the third protrusion 145 is disposed around the second protrusion 144 and connected to the rupture disk 142, the third protrusion 145 sinks relative to the second protrusion 144, and the second protrusion 144, the third protrusion 145, and the rupture disk 142 sink in sequence to form a step structure. The feature of the third protrusion 145 may reduce the difference in thickness of the second protrusion 144 and the rupture disc 142, thereby improving manufacturability of this type of construction of the rupture valve 14. In addition, this structure can ensure a sufficient thickness of the second protrusions 144 to ensure sufficient strength of the reinforcing protrusions.
The material of the explosion-proof valve 14 may be aluminum, stainless steel, copper, or the like.
Referring to fig. 2 and 3, the battery cover assembly further includes a protective sheet 16, and the protective sheet 16 is attached to the reinforcing bosses 141 to cover the explosion-proof sheet 142. The protection sheet 16 may be made of a transparent material so as to directly observe the use state of the explosion-proof sheet 142.
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (10)
1. A battery top cap assembly for capping a housing of a battery cell, the battery top cap assembly comprising:
the top cover is provided with an explosion-proof hole and is used for sealing the shell;
explosion-proof valve, including strengthening boss and explosion-proof piece, strengthen the boss and encircle the explosion-proof piece sets up, the thickness of strengthening the boss is greater than the explosion-proof piece, strengthen the boss with the top cap is connected, explosion-proof piece capping explosion-proof hole.
2. The battery top cap assembly of claim 1, wherein the reinforcement boss is welded to the top cap.
3. The battery top cap assembly of claim 2, wherein the top cap defines a retaining groove around the explosion-proof hole, and the reinforcing boss is retained in the retaining groove.
4. The battery top cap assembly of claim 3, wherein the reinforcing boss comprises a first protrusion and a second protrusion, the first protrusion is disposed around the rupture disc, the first protrusion is stop-fit in the stop groove, the first protrusion is flush with the top cap, and the second protrusion is stacked on the first protrusion.
5. The battery top cap assembly of claim 4, wherein the thickness of the first protrusion is greater than the thickness of the rupture disk.
6. The battery top cap assembly of claim 4, wherein the reinforcing boss further comprises a third protrusion disposed around the second protrusion and connected to the rupture disk, the third protrusion being depressed relative to the second protrusion to form a stepped structure.
7. The battery top cap assembly of claim 3, wherein the top cap is provided with a chamfer at the edge of the retaining groove.
8. The battery top cap assembly of claim 1, wherein the battery cap assembly further comprises a protective sheet affixed to the reinforcing bosses to cover the rupture disk.
9. The battery cap assembly of claim 1, wherein the thickness of the rupture disc is 0.4 to 1 mm, and the rupture disc is provided with a score.
10. A battery cell, comprising: a cell, a housing, and the battery cap assembly of any of claims 1 to 9, the cell being assembled in the housing, the battery cap assembly capping the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020597203.4U CN212161868U (en) | 2020-04-20 | 2020-04-20 | Battery top cap subassembly and battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020597203.4U CN212161868U (en) | 2020-04-20 | 2020-04-20 | Battery top cap subassembly and battery cell |
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| Publication Number | Publication Date |
|---|---|
| CN212161868U true CN212161868U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020597203.4U Active CN212161868U (en) | 2020-04-20 | 2020-04-20 | Battery top cap subassembly and battery cell |
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| CN (1) | CN212161868U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382826A (en) * | 2021-01-15 | 2021-02-19 | 蜂巢能源科技有限公司 | A explosion-proof valve, electric core and battery module for electric core |
| CN114024087A (en) * | 2021-09-26 | 2022-02-08 | 常州瑞德丰精密技术有限公司 | Rupture disk for double-open type blasting |
| CN114937849A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Explosion-proof valve, battery cover plate assembly and power battery |
| WO2023109196A1 (en) * | 2021-09-30 | 2023-06-22 | 欣旺达电动汽车电池有限公司 | Explosion-proof valve, top cover assembly, and battery |
| WO2024045456A1 (en) * | 2022-08-29 | 2024-03-07 | 欣旺达动力科技股份有限公司 | Explosion-proof valve and battery |
-
2020
- 2020-04-20 CN CN202020597203.4U patent/CN212161868U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382826A (en) * | 2021-01-15 | 2021-02-19 | 蜂巢能源科技有限公司 | A explosion-proof valve, electric core and battery module for electric core |
| CN114024087A (en) * | 2021-09-26 | 2022-02-08 | 常州瑞德丰精密技术有限公司 | Rupture disk for double-open type blasting |
| WO2023109196A1 (en) * | 2021-09-30 | 2023-06-22 | 欣旺达电动汽车电池有限公司 | Explosion-proof valve, top cover assembly, and battery |
| CN114937849A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Explosion-proof valve, battery cover plate assembly and power battery |
| WO2024045456A1 (en) * | 2022-08-29 | 2024-03-07 | 欣旺达动力科技股份有限公司 | Explosion-proof valve and battery |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |