Battery explosion-proof shell and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery explosion-proof shell and a battery monomer. The explosion-proof battery shell comprises a shell body and a top cover plate, the top cover piece covers the opening of the shell body, a thinning area formed by stretching is arranged on the top cover piece, a U-shaped groove is formed in the thinning area, the U-shaped groove extends in the thinning area in the circumferential direction and is arranged in a closed loop mode, a nick is arranged at the bottom of the U-shaped groove, and the nick extends in the circumferential direction of the bottom of the U-shaped groove and is arranged in a closed loop mode. And the thinned area, the U-shaped groove and the nick form an anti-explosion valve structure of the battery anti-explosion shell. The battery explosion-proof shell is high in safety and good in stability. The battery monomer comprises the battery cell and the battery explosion-proof shell, the battery cell is located in the battery explosion-proof shell, and due to the battery explosion-proof shell, the battery monomer is high in safety and good in stability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery explosion-proof housing and a battery cell. Background Technology

[0002] Explosion-proof valves are safety components of power batteries. When the gas production inside the battery reaches a certain level, the explosion-proof valve will burst open to release pressure and prevent the battery from exploding. Therefore, the explosion-proof valve is an important part of the power battery. One type of explosion-proof valve in existing technology is typically made by laser welding a single explosion-proof valve to the battery substrate. However, the welding process is cumbersome and costly, and defects such as incomplete welds and weld holes can lead to significant safety hazards. Another type of explosion-proof valve in existing technology is integrally molded with the battery substrate. This type of valve is created by extruding the substrate material using a mold to thin it, and then scoring the thinned area (the opening part of the explosion-proof valve needs to be very thin to achieve burst opening). However, because the substrate material is repeatedly thinned by extrusion, it hardens and has high residual internal stress, resulting in a high burst opening pressure and poor stability of the explosion-proof valve, also posing significant safety hazards.

[0003] Therefore, there is an urgent need to propose a battery explosion-proof casing and a battery cell to solve the above problems. Utility Model Content

[0004] The first objective of this invention is to provide a battery explosion-proof housing that is highly safe and has good stability.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Battery explosion-proof housing, including:

[0007] Shell body;

[0008] A top cover sheet is provided on the opening of the shell body. The top cover sheet has a thinning area formed by stretching. A U-shaped groove is provided in the thinning area. The U-shaped groove extends circumferentially and is arranged in a closed loop along the thinning area. A groove is provided at the bottom of the U-shaped groove. The groove extends circumferentially and is arranged in a closed loop at the bottom of the U-shaped groove. The thinning area, the U-shaped groove and the groove form the explosion-proof valve structure of the battery explosion-proof shell.

[0009] As an optional technical solution for battery explosion-proof housing, the top cover sheet has a groove protruding towards the battery cell on the side away from the battery cell, and the thinning area is formed by stretching and thinning the groove.

[0010] As an optional technical solution for battery explosion-proof housing, the sink is formed by stamping the top cover plate.

[0011] As an optional technical solution for the battery explosion-proof housing, the battery explosion-proof housing also includes an explosion-proof film, which is applied to the opening of the sink.

[0012] As an optional technical solution for battery explosion-proof housing, the U-shaped groove is formed by stamping the thinned area.

[0013] As an optional technical solution for battery explosion-proof housing, the cross-sectional shape of the groove is an inverted trapezoid.

[0014] As an optional technical solution for battery explosion-proof housing, the U-shaped groove has an elliptical racetrack-shaped planar shape.

[0015] As an optional technical solution for battery explosion-proof housing, the top cover is integrally formed with the housing body.

[0016] As an optional technical solution for battery explosion-proof housing, the top cover is formed separately from the housing body.

[0017] The second objective of this invention is to provide a battery cell that is highly safe and has good stability.

[0018] To achieve this objective, the present invention adopts the following technical solution:

[0019] A battery cell includes a battery cell and the aforementioned battery explosion-proof housing, wherein the battery cell is located inside the battery explosion-proof housing.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a battery explosion-proof housing comprising a housing body and a top cover. The top cover is positioned over the opening of the housing body, working together with the housing body to protect the battery cell. The top cover has a thinned area formed by stretching, within which a U-shaped groove is formed. A notch is provided at the bottom of the U-shaped groove, forming an integrally molded explosion-proof valve structure on the battery explosion-proof housing. When the gas production inside the battery explosion-proof housing reaches a certain threshold, the explosion-proof valve structure deforms, and the notch in the thinned area breaks, achieving the purpose of explosion-proof opening and pressure relief. Compared to the separate explosion-proof valves in the prior art, the integrally molded explosion-proof valve structure on this battery explosion-proof housing avoids the safety hazards associated with separate welding, improves the safety performance of the battery explosion-proof housing, and is simple and low-cost. Furthermore, compared to the thin walls formed by extrusion in the prior art, the thinned area formed by stretching on this battery explosion-proof housing avoids the problems of material hardening and high residual internal stress caused by extrusion thinning, thus avoiding the problems of poor stability and low safety of the explosion-proof valve structure. Attached Figure Description

[0022] Figure 1This is an exploded view of the cover plate assembly in the battery explosion-proof housing provided in Embodiment 1 of this utility model;

[0023] Figure 2 This is a partial cross-sectional view of the cover plate assembly in the battery explosion-proof housing provided in Embodiment 1 of this utility model;

[0024] Figure 3 yes Figure 2 Enlarged view at point A;

[0025] Figure 4 This is a schematic diagram of the structure of the battery explosion-proof housing provided in Embodiment 2 of this utility model.

[0026] In the picture:

[0027] 100. Top cover plate; 110. Explosion-proof valve structure; 111. U-shaped groove; 112. Score; 120. Explosion-proof film; 200. Shell body; 300. Lower plastic. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] Example 1

[0033] This embodiment provides a battery explosion-proof housing, which has high safety and good stability.

[0034] Specifically, such as Figures 1 to 3 As shown, the battery explosion-proof housing includes a housing body 200 ( Figures 1 to 3 (Not shown in the image) and a top cover 100. The top cover 100 covers the opening of the shell body 200. The top cover 100 has a thinning area formed by stretching. A U-shaped groove 111 is provided in the thinning area. The U-shaped groove 111 extends circumferentially and is arranged in a closed loop along the thinning area. A groove 112 is provided at the bottom of the U-shaped groove 111. The groove 112 extends circumferentially and is arranged in a closed loop at the bottom of the U-shaped groove 111. The thinning area, the U-shaped groove 111 and the groove 112 form the explosion-proof valve structure 110 of the battery explosion-proof shell.

[0035] Based on the above design, the top cover 100 is placed over the opening of the shell body 200, working together with the shell body 200 to protect the battery cell. The top cover 100 has a thinned area formed by stretching, within which a U-shaped groove 111 is formed. The bottom of the U-shaped groove 111 has a notch 112, forming an integrally formed explosion-proof valve structure 110 on the battery explosion-proof shell. When the gas production inside the battery explosion-proof shell reaches a certain threshold, the explosion-proof valve structure 110 deforms, and the notch 112 in the thinned area breaks, achieving the purpose of explosion-proof opening and pressure relief. Compared to the separate explosion-proof valves in the prior art, the integrally formed explosion-proof valve structure 110 on the battery explosion-proof shell avoids the safety hazards of separate welding, improves the safety performance of the battery explosion-proof shell, and has a simpler and lower cost. Furthermore, compared to the thin walls formed by extrusion in the prior art, the thinned area formed by stretching on the battery explosion-proof shell avoids the problems of material hardening and large residual internal stress caused by extrusion thinning, thus avoiding the problems of poor stability and low safety of the explosion-proof valve structure 110.

[0036] It should be noted that the thickness of the thinned area is less than the thickness of other areas on the top cover sheet 100 besides the thinned area.

[0037] Furthermore, the top cover plate 100 has a recessed groove protruding towards the battery cell on the side facing away from the battery cell (not shown in the figure). The thinning area is formed by a stretching and thinning step at the location of the recessed groove. The recessed groove can position the stretching and thinning area of ​​the explosion-proof valve structure 110, increase the thinning and stretching effect of the top cover plate 100, and facilitate the thinning and stretching operation of the top cover plate 100. In addition, the recessed groove can make the surface of the thinning area facing away from the battery cell lower than the surface of other areas on the top cover plate 100.

[0038] Optionally, the sink is formed by stamping the top cover plate 100, that is, the top cover plate 100 is stamped into a concave-convex shape by a mold, which is simple to process.

[0039] Optionally, the battery explosion-proof housing also includes an explosion-proof film 120, which covers the opening of the sink to prevent debris from entering the explosion-proof valve structure 110.

[0040] Of course, due to the sink setting, the surface of the thinned area on the side away from the battery cell is lower than the surface of other areas on the top cover plate 100, which can ensure that the explosion-proof valve film does not extend beyond the surface of the top cover plate 100.

[0041] Similarly, the U-shaped groove 111 is formed by stamping the thinned area.

[0042] Continue as Figure 1 As shown, the cross-sectional shape of the notch 112 is an inverted trapezoid. Of course, the cross-sectional shape of the notch 112 can also be other shapes such as U-shape or V-shape.

[0043] The U-shaped groove 111 has an elliptical racetrack-like planar shape. Of course, the planar shape of the U-shaped groove 111 can also be other shapes such as square, rhombus, or circle.

[0044] Optionally, the top cover plate 100 is formed separately from the shell body 200. After the battery cell is installed from the side where the top cover plate 100 is located in the shell body 200, the top cover plate 100 is used to seal the opening of the shell body 200.

[0045] In this embodiment, the battery explosion-proof housing also includes a positive terminal, a negative terminal, and a lower plastic 300. The lower plastic 300 is attached to the top cover 100 near the battery cell. The positive and negative terminals are both inserted through and connected to the top cover 100 and the lower plastic 300. In actual production, the top cover 100, the lower plastic 300, the positive terminal, and the negative terminal together constitute the cover assembly of the battery explosion-proof housing, which seals the opening of the housing body 200.

[0046] The following is the specific method for forming the explosion-proof valve structure 110:

[0047] The base material (in this embodiment, the battery explosion-proof shell) is stamped into a concave-convex shape by a mold to form a sink.

[0048] The base material is then stretched through a die punch and die to create a thinned area (this step can be divided into multiple stretching steps depending on the actual situation).

[0049] The thinned area of ​​the matrix material is stamped into a U-shaped groove 111 by a mold.

[0050] The bottom of the U-shaped groove 111 is pressed by a mold to create the explosion-proof valve structure 110 and the opening groove 112.

[0051] This embodiment also provides a battery cell that has high safety and good stability.

[0052] Specifically, the battery cell includes the aforementioned battery explosion-proof housing, with the cell located inside the housing. Since the explosion-proof valve structure 110 is integrally formed with the top cover 100, the explosion-proof valve structure 110 avoids the safety hazards associated with separate welding, improving the safety performance of the battery explosion-proof housing while also being simple and low-cost. Simultaneously, the thinning area formed by stretching avoids the problems of material hardening and high residual internal stress caused by extrusion thinning, thus preventing the poor stability and low safety of the explosion-proof valve structure 110.

[0053] Example 2

[0054] This embodiment provides a battery explosion-proof housing and a battery cell. The following mainly describes the differences between this embodiment and the previous embodiments, while the similarities will not be repeated.

[0055] Specifically, such as Figure 4 As shown, the top cover 100 is integrally formed with the shell body 200, that is, the top cover 100 is the top plate of the battery explosion-proof shell, and the battery cell (not shown in the figure) is installed from the opposite side of the top cover 100 of the shell body 200 (the bottom plate side of the shell body 200).

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery explosion-proof housing, characterized in that, include: Shell body (200); A top cover (100) is provided on the opening of the shell body (200). The top cover (100) has a thinning area formed by stretching. A U-shaped groove (111) is provided in the thinning area. The U-shaped groove (111) extends circumferentially and is arranged in a closed loop along the thinning area. A groove (112) is provided at the bottom of the U-shaped groove (111). The groove (112) extends circumferentially and is arranged in a closed loop at the bottom of the U-shaped groove (111). The thinning area, the U-shaped groove (111), and the groove (112) form the explosion-proof valve structure (110) of the battery explosion-proof shell.

2. The battery explosion-proof housing according to claim 1, characterized in that, The top cover plate (100) has a groove protruding toward the battery cell on the side away from the battery cell, and the thinning area is formed by stretching and thinning the groove.

3. The battery explosion-proof housing according to claim 2, characterized in that, The settling tank is formed by stamping the top cover plate (100).

4. The battery explosion-proof housing according to claim 2, characterized in that, The battery explosion-proof housing also includes an explosion-proof film (120), which is applied to the opening of the sink.

5. The battery explosion-proof housing according to claim 1, characterized in that, The U-shaped groove (111) is formed by stamping the thinned area.

6. The battery explosion-proof housing according to claim 1, characterized in that, The cross-sectional shape of the notch (112) is an inverted trapezoid.

7. The battery explosion-proof housing according to claim 1, characterized in that, The U-shaped groove (111) has an elliptical racetrack shape in plan.

8. The battery explosion-proof housing according to claim 1, characterized in that, The top cover (100) is integrally formed with the shell body (200).

9. The battery explosion-proof housing according to claim 1, characterized in that, The top cover plate (100) is formed separately from the shell body (200).

10. A single battery cell, characterized in that, It includes a battery cell and a battery explosion-proof housing as described in any one of claims 1-9, wherein the battery cell is located inside the battery explosion-proof housing.

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