Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a cover plate sheet and an explosion-proof assembly. And the cover plate sheet is provided with an explosion-proof hole. The explosion-proof assembly comprises an explosion-proof valve; and the explosion-proof valve is connected to one surface, facing the outer side of the battery monomer, of the cover plate sheet and covers the explosion-proof hole. The anti-explosion valve comprises a platform part, a convex edge part and a surrounding edge part, the platform part corresponds to the anti-explosion hole and is arranged at an interval, and a nick groove is formed in the face, away from the anti-explosion hole, of the platform part. And the convex edge part is connected to the platform part in a surrounding manner and extends towards the cover plate sheet. One end of the surrounding edge part surrounds and is connected to the convex edge part, and the other end surrounds the explosion-proof hole and is connected to the cover plate sheet. According to the battery top cover, the influence of welding of the explosion-proof valve and the cover plate sheet and welding of the battery top cover and the shell on the platform part can be reduced, and the stress deformation of the bottom wall of the nick groove is reduced, so that the risk of breakage of the bottom wall of the nick groove is reduced, the structural strength of the explosion-proof valve is ensured, and the safety of the battery top cover is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery cell. Background Art

[0002] With the continuous progress of battery technology, more and more electronic products choose batteries as power sources, providing broad space for the application and development of batteries. With the development of battery technology, the requirements for the use performance and safety of batteries are increasing day by day. In existing batteries, an explosion-proof hole is generally opened on the top cover sheet, and an explosion-proof sheet is welded on the explosion-proof hole. Continuous notches are distributed on the explosion-proof sheet. When an abnormal internal pressure in the battery rises sharply, the pressure difference force inside and outside the battery cracks the explosion-proof sheet from the notch, discharging the gas inside the battery, so as to release the pressure inside the battery cell and avoid explosion caused by the sharp increase in the internal air pressure of the battery with nowhere to release.

[0003] In the existing battery structure, the explosion-proof sheet is first welded at the position of the explosion-proof hole of the top cover sheet, and then the top cover sheet is welded around the opening of the housing to form a single battery cell. Usually, a circular or elliptical explosion-proof sheet is used. However, for the battery top cover using a simple sheet-shaped explosion-proof sheet, when welding with the housing, due to the thermal expansion and deformation of the battery top cover, a tensile force will be applied to the explosion-proof sheet. Since the thickness of the battery top cover at the notch position is relatively thin and the structural strength is low, the notch is easily damaged under the action of the tensile force, and in severe cases, the notch will crack, causing serious safety hazards.

[0004] Therefore, there is an urgent need for a battery top cover and a battery cell to solve the above problems. Summary of the Utility Model

[0005] An object of the utility model is to provide a battery top cover, which can reduce the influence of welding deformation notches, improve the structural strength of the battery top cover, and ensure the safety of the battery top cover.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provide a battery top cover, comprising:

[0008] A cover plate, on which an explosion-proof hole is provided;

[0009] An explosion-proof component, which includes an explosion-proof valve. The explosion-proof valve is connected to the outer side of the cover plate facing the battery cell and covers the explosion-proof hole. The explosion-proof valve includes a platform part, a convex edge part and a surrounding edge part. The platform part corresponds to the explosion-proof hole and is spaced apart. A notch groove is provided on the surface of the platform part facing away from the explosion-proof hole. The convex edge part is connected around the platform part and extends towards the cover plate. One end of the surrounding edge part is connected around the convex edge part, and the other end surrounds the explosion-proof hole and is connected to the cover plate.

[0010] As an alternative solution for the battery top cover, the explosion-proof component further includes an explosion-proof valve film. The explosion-proof valve film is connected to the side of the platform portion facing away from the explosion-proof hole, and the explosion-proof valve film covers the notch groove.

[0011] As an alternative solution for the battery top cover, the platform portion is further provided with a structural groove. The structural groove is arranged on the side of the platform portion facing away from the explosion-proof hole. The notch groove is arranged on the bottom wall of the structural groove, and the explosion-proof valve film covers the structural groove.

[0012] As an alternative solution for the battery top cover, the battery top cover further includes a pole column assembly. The cover plate is further provided with a first pole column hole, and the pole column passes through the first pole column hole.

[0013] As an alternative solution for the battery top cover, the battery top cover further includes an upper plastic part. The upper plastic part is located above the cover plate and surrounds the pole column assembly. The upper plastic part is located between the cover plate and the pole column assembly.

[0014] As an alternative solution for the battery top cover, the pole column assembly includes a fixing part and a pole column body. The fixing part is located above the cover plate, and the pole column body passes through the cover plate and is connected to the fixing part in a penetrating manner.

[0015] As an alternative solution for the battery top cover, the battery top cover further includes a lower insulating part. The lower insulating part is connected to the side of the cover plate facing the inside of the battery cell.

[0016] As an alternative solution for the battery top cover, the lower insulating part is provided with a ventilation hole, and the ventilation hole is correspondingly arranged below the explosion-proof hole.

[0017] As an alternative solution for the battery top cover, the lower insulating part includes a main body part and a protruding part. The main body part abuts against the lower surface of the cover plate. The protruding part is connected to the main body part and is correspondingly arranged below the explosion-proof hole. The protruding part protrudes in a direction away from the explosion-proof hole, and the ventilation hole is arranged on the protruding part.

[0018] Another object of the present invention is to provide a battery cell with good structural strength to ensure the safety of the battery cell.

[0019] To achieve this object, the present invention adopts the following technical solutions:

[0020] Provide a battery cell, including a battery core, a housing, and the above-mentioned battery top cover. The battery core is located in the housing, and the battery top cover is sealingly connected to the opening of the housing.

[0021] Advantages of the present utility model:

[0022] The present utility model provides a battery top cover, which includes an explosion-proof valve and a cover plate provided with an explosion-proof hole. The explosion-proof valve includes a platform portion, a convex edge portion and a surrounding edge portion. The platform portion is spaced from the explosion-proof hole, and a scoring groove is provided on the surface of the platform portion facing away from the explosion-proof hole. When the internal pressure of the battery cell is too high, the scoring groove can rupture to discharge the gas inside the battery cell. The convex edge portion and the surrounding edge portion are sequentially connected around the edge of the platform portion, and the surrounding edge portion is connected to the cover plate. When assembling the explosion-proof valve, the surrounding edge portion is welded to the cover plate, and the welding deformation of the surrounding edge portion can be absorbed by the convex edge portion, reducing the influence of the deformation on the platform portion, thereby reducing the stress deformation amplitude at the bottom of the scoring groove; when the cover plate is welded to the housing, the cover plate will undergo welding deformation, generating tensile forces in different directions on the explosion-proof valve. The convex edge portion can continue to absorb the tensile forces and deformations in different directions, reducing the influence of the welding of the battery top cover and the housing on the platform portion, further reducing the stress deformation amplitude of the bottom wall of the scoring groove, thereby reducing the risk of rupture of the bottom wall of the scoring groove, ensuring the structural strength of the explosion-proof valve, improving the safety of the battery top cover, and reducing the material loss of the battery top cover during the production process, saving production costs.

[0023] The present utility model also provides a battery cell, the explosion-proof valve of its battery top cover has a stable structure and good anti-deformation ability, improving the safety of the battery cell. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the explosion-proof valve of the battery top cover provided by the present utility model;

[0025] Figure 2 is a cross-sectional view of the battery top cover provided by the present utility model;

[0026] Figure 3 is a schematic structural diagram of the battery cell provided by the present utility model.

[0027] In the figure:

[0028] 1. Cover plate; 11. Explosion-proof hole;

[0029] 2. Explosion-proof component; 21. Explosion-proof valve; 211. Platform portion; 2111. Scoring groove; 2112. Structural groove; 212. Convex edge portion; 213. Surrounding edge portion; 22. Explosion-proof valve film;

[0030] 3. Terminal assembly; 31. Fixing member; 32. Terminal body; 321. Contact portion; 322. Passing portion;

[0031] 4. Upper plastic part;

[0032] 5. Lower insulating part; 51. Ventilation hole; 52. Main body portion; 53. Protruding portion;

[0033] 6. Sealing ring;

[0034] 100. Housing. Detailed implementation manner

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] Such as Figures 1 to 3As shown in the figure, the battery top cover of this embodiment includes a cover plate 1 and an explosion-proof component 2. The cover plate 1 is provided with an explosion-proof hole 11. The explosion-proof component 2 includes an explosion-proof valve 21, and the explosion-proof valve 21 is connected to the side of the cover plate 1 facing the outside of the battery cell and covers the explosion-proof hole 11. The explosion-proof valve 21 includes a platform portion 211, a convex edge portion 212 and a surrounding edge portion 213. The platform portion 211 corresponds to the explosion-proof hole 11 and is arranged at an interval. A notch groove 2111 is provided on the surface of the platform portion 211 facing away from the explosion-proof hole 11. Optionally, the notch groove 2111 is an annular groove. The convex edge portion 212 is connected to the platform portion 211 in a surrounding manner and extends towards the cover plate 1. One end of the surrounding edge portion 213 is connected to the convex edge portion 212 in a surrounding manner, and the other end surrounds the explosion-proof hole 11 and is connected to the cover plate 1.

[0040] Based on the above design, when the internal pressure of the battery cell is too high, the notch groove 2111 can break to discharge the gas inside the battery cell. The convex edge portion 212 and the surrounding edge portion 213 are sequentially connected to the edge of the platform portion 211 in a surrounding manner. The surrounding edge portion 213 surrounds the explosion-proof hole 11 and is connected to the cover plate 1. When installing the explosion-proof valve 21, the surrounding edge portion 213 is welded to the cover plate 1, and the welding deformation of the surrounding edge portion 213 can be absorbed by the convex edge portion 212, reducing the influence of the deformation on the platform portion 211, thereby reducing the stress deformation amplitude at the bottom of the notch groove 2111; when the cover plate 1 is welded to the housing 100, the cover plate 1 will undergo welding deformation, generating tensile forces in different directions on the explosion-proof valve 21. The convex edge portion 212 can continue to absorb the tensile forces and deformations in different directions, reducing the influence of the welding of the battery top cover and the housing on the platform portion 211, further reducing the stress deformation amplitude of the bottom wall of the notch groove 2111, thereby reducing the risk of the bottom wall of the notch groove 2111 breaking, ensuring the structural strength of the explosion-proof valve 21, improving the safety of the battery top cover, and reducing the material loss of the battery top cover during the production process, saving production costs.

[0041] Optionally, the platform part 211 is further provided with a structural groove 2112. The structural groove 2112 is disposed on the side of the platform part 211 away from the explosion-proof hole 11, and the scoring groove 2111 is disposed on the bottom wall of the structural groove 2112. Providing the structural groove 2112 can reduce the thickness of the platform part 211. When the internal pressure of the battery cell is relatively large, under the action of the pressure difference between the inside and outside of the battery cell, it is easier for the bottom wall of the scoring groove 2111 to rupture, thereby releasing the gas inside the battery cell and improving the effectiveness of the explosion-proof valve 21 and the safety of the battery top cover. Preferably, the scoring groove 2111 is a discontinuous annular groove structure, and the thickness of the disconnection position is the same as the thickness of the bottom wall of the structural groove 2112. When the pressure relief starts after the scoring groove 2111 ruptures, the disconnection position will connect the fragments formed by the rupture of the scoring groove 2111 to the bottom wall of the structural groove 2112, preventing the fragments from flying out and causing potential safety hazards. In this embodiment, the thickness of the bottom wall of the scoring groove 2111 is 0.04 mm - 0.15 mm. Exemplarily, the thickness of the bottom wall of the scoring groove 2111 can be set to 0.04 mm, 0.08 mm, 0.10 mm, 0.12 mm, or 0.15 mm, etc.

[0042] Optionally, the explosion-proof component 2 further includes an explosion-proof valve film 22. The explosion-proof valve film 22 is connected to the side of the platform part 211 away from the explosion-proof hole 11, and the explosion-proof valve film 22 covers the structural groove 2112, and further the explosion-proof valve film 22 also covers above the scoring groove 2111. Such a setting can prevent other objects from bumping the scoring groove 2111 and the structural groove 2112 during the manufacturing process of the explosion-proof component 2, resulting in damage to the scoring groove 2111 and the structural groove 2112.

[0043] Furthermore, the battery top cover further includes a lower insulating member 5. The lower insulating member 5 is connected to the side of the cover plate 1 facing the inside of the battery cell for insulating the inside of the battery cell from the battery top cover.

[0044] Specifically, the lower insulating member 5 includes a ventilation hole 51, a main body part 52, and a protruding part 53. The main body part 52 abuts against the lower surface of the cover plate 1, and the protruding part 53 is connected to the main body part 52 and is correspondingly disposed below the explosion-proof hole 11. The protruding part 53 protrudes away from the explosion-proof hole 11, and the ventilation hole 51 is disposed on the protruding part 53 and is correspondingly disposed below the explosion-proof hole 11. The ventilation hole 51 can allow the gas inside the battery cell to pass through to realize the release of the gas. There is a gap between the protruding part 53 and the explosion-proof hole 11, which can provide a flow channel for the gas to ensure the smooth flow of the gas. Optionally, a plurality of ventilation holes 51 are provided, and the plurality of ventilation holes 51 are evenly distributed on the protruding part 53 to expand the gas flow area and ensure the gas release effect.

[0045] Furthermore, the battery top cover also includes a pole assembly 3, the cover plate 1 is also provided with a first pole hole, the lower insulating member 5 is provided with a second pole hole, and the pole assembly 3 is passed through the first pole hole and the second pole hole to achieve electrical connection inside and outside the battery cell. In this embodiment, two pole assemblies 3 are provided, and the two pole assemblies 3 are respectively a positive pole and a negative pole, and the two pole assemblies 3 are located at both ends of the cover plate 1.

[0046] Optionally, the pole assembly 3 includes a fixing member 31 and a pole body 32, the fixing member 31 is located above the cover plate 1, the pole body 32 is penetrated in the first pole hole and the second pole hole, and the pole body 32 is penetrated and connected to the fixing member 31, so as to realize the fixed connection between the pole assembly 3 and the cover plate 1. Specifically, the pole body 32 includes an abutting portion 321 and a penetrating portion 322, the upper surface of the abutting portion 321 abuts against the lower surface of the lower insulating member 5, and the penetrating portion 322 penetrates the second pole hole, the first pole hole and the fixing member 31 from bottom to top in sequence and is connected to the fixing member 31.

[0047] Furthermore, the battery top cover also includes a sealing ring 6, which is sleeved on the penetration portion 322 and located between the lower insulating member 5 and the penetration portion 322 to achieve sealing between the pole assembly 3 and the cover plate 1.

[0048] Furthermore, the battery top cover also includes an upper plastic part 4, which is located above the cover plate 1 and is arranged around the pole assembly 3. The upper plastic part 4 is located between the cover plate 1 and the pole assembly 3 to achieve insulation between the fixing part 31 and the cover plate 1.

[0049] This embodiment also provides a battery cell, including a battery core, a housing 100 and the battery top cover, wherein the battery core is located in the housing 100, and the battery top cover is sealed and connected to the opening of the housing 100. The battery cell uses the battery top cover, which can ensure that the explosion-proof valve has a stable structure, has good anti-deformation ability, and improves the safety of the battery cell.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery top cover, characterized in that, Comprising: A cover plate piece (1), with an explosion-proof hole (11) provided on the cover plate piece (1); An explosion-proof component (2), the explosion-proof component (2) includes an explosion-proof valve (21), the explosion-proof valve (21) is connected to the side of the cover plate piece (1) facing the outside of the battery cell and covers the explosion-proof hole (11), the explosion-proof valve (21) includes a platform portion (211), a convex edge portion (212) and a surrounding edge portion (213), the platform portion (211) corresponds to and is spaced from the explosion-proof hole (11), a scoring groove (2111) is provided on the side of the platform portion (211) facing away from the explosion-proof hole (11), the convex edge portion (212) is connected around the platform portion (211) and extends towards the cover plate piece (1), and one end of the surrounding edge portion (213) is connected around the convex edge portion (212), and the other end surrounds the explosion-proof hole (11) and is connected to the cover plate piece (1).

2. The battery top cover according to claim 1, wherein The explosion-proof component (2) further includes an explosion-proof valve film (22), the explosion-proof valve film (22) is connected to the side of the platform portion (211) facing away from the explosion-proof hole (11), and the explosion-proof valve film (22) covers the scoring groove (2111).

3. The battery top cover according to claim 2, characterized in that, The platform portion (211) is further provided with a structure groove (2112), the structure groove (2112) is provided on the side of the platform portion (211) facing away from the explosion-proof hole (11), the scoring groove (2111) is provided on the bottom wall of the structure groove (2112), and the explosion-proof valve film (22) covers the structure groove (2112).

4. The battery top cover according to claim 1, wherein The battery top cover further includes a pole column component (3), the cover plate piece (1) is further provided with a first pole column hole, and the pole column component (3) passes through the first pole column hole.

5. The battery top cover according to claim 4, characterized in that, The battery top cover further includes an upper plastic part (4), the upper plastic part (4) is located above the cover plate piece (1) and is arranged around the pole column component (3), and the upper plastic part (4) is located between the cover plate piece (1) and the pole column component (3).

6. The battery top cover according to claim 4, characterized in that, The pole column component (3) includes a fixing part (31) and a pole column body (32), the fixing part (31) is located above the cover plate piece (1), and the pole column body (32) passes through the cover plate piece (1) and is connected to the fixing part (31).

7. The battery top cover according to claim 1, wherein The battery top cover further includes a lower insulating part (5), and the lower insulating part (5) is connected to the side of the cover plate piece (1) facing the inside of the battery cell.

8. The battery top cover according to claim 7, characterized in that, The lower insulating part (5) is provided with a ventilation hole (51), and the ventilation hole (51) is correspondingly arranged below the explosion-proof hole (11).

9. The battery top cover according to claim 8, wherein, The lower insulating part (5) includes a main body part (52) and a protruding part (53), the main body part (52) abuts against the lower surface of the cover plate piece (1), the protruding part (53) is connected to the main body part (52) and is correspondingly arranged below the explosion-proof hole (11), the protruding part (53) protrudes in a direction away from the explosion-proof hole (11), and the ventilation hole (51) is provided on the protruding part (53).

10. A battery cell, characterized in that, It includes a battery cell, a housing (100), and the battery top cover according to any one of claims 1-9. The battery cell is located in the housing (100), and the battery top cover is sealingly connected to the opening of the housing (100).

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