Battery cell cover plate and battery

Abstract

The utility model relates to a battery field provides a kind of battery and electric core cover plate.Electric core cover plate, including lower plastic light aluminum sheet, the first side of light aluminum sheet is installed in lower plastic, the second side of light aluminum sheet is formed with the first boss portion and second boss portion that protrude towards the direction away from lower plastic;Explosion-proof valve, install in light aluminum sheet and between the first boss portion and second boss portion, the position corresponding with explosion-proof valve on light aluminum sheet is provided with reinforcing structure.The deformation of the first boss portion, second boss portion in the electric core cover plate in charge and discharge cycle due to stress change, will be transmitted to surrounding area through light aluminum sheet.Reinforcing structure passes through the thickness of the material around explosion-proof valve or changes stress distribution path, blocks deformation transmission, reduces the warping or displacement of explosion-proof valve installation edge, ensures sealing performance.Reinforcing structure enhances the rigidity of light aluminum sheet around explosion-proof valve, so that the stress concentration of welding edge is significantly reduced when explosion-proof valve repeatedly fluctuates in the pressure inside electric core.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cell cover plate and a battery. Background Technology

[0002] In current battery pack designs, the welding process between the cell cover and the external connector, as well as the bonding structure with the cell, are crucial to overall performance. To achieve efficient heat dissipation from the cell, a water-cooling plate is typically used above the cell assembly. A common practice is to design the cell cover to be higher than the terminal post, allowing it to fit tightly against the water-cooling plate after the external connector is welded on. However, this process reduces the original thickness of the substrate due to the protruding design of the cell cover. While this design provides some heat dissipation, it also introduces certain problems.

[0003] Specifically, in traditional designs, the explosion-proof valve is directly welded to an aluminum sheet with a relatively thick substrate. In the new design, however, the explosion-proof valve is welded to a thinner, smooth aluminum sheet that has undergone a thinning process. During the charge-discharge cycles of the battery cell, the stress experienced by the convex portion during deformation is significant, which weakens the deformation resistance of the surrounding smooth aluminum sheet. This can lead to fatigue in the smooth aluminum sheet around the explosion-proof valve, affecting its effective operation and reducing its protective performance in the event of a sudden battery cell failure. Utility Model Content

[0004] This utility model provides a battery cell cover plate to solve the defect in related technologies where heat dissipation and anti-fatigue performance of explosion-proof valves cannot be guaranteed at the same time.

[0005] This utility model embodiment also provides a battery.

[0006] The first aspect of this utility model provides a battery cell cover plate, comprising: Plastic bottom; A light aluminum sheet, wherein a first side of the light aluminum sheet is mounted on the lower plastic, and a second side of the light aluminum sheet is formed with a first boss portion and a second boss portion protruding in a direction away from the lower plastic; An explosion-proof valve is installed on the aluminum sheet and located between the first boss portion and the second boss portion. A reinforcing structure is provided on the aluminum sheet at the position corresponding to the explosion-proof valve.

[0007] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve along its length.

[0008] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve in the width direction.

[0009] According to one embodiment of the present invention, the reinforcing structure is formed on at least one side of the explosion-proof valve in the length and width directions.

[0010] According to one embodiment of the present invention, the reinforcing structure includes a protrusion formed on the aluminum sheet, the protrusion protruding in a direction away from the lower plastic.

[0011] According to one embodiment of the present invention, the reinforcing structure includes a recessed portion formed on the aluminum sheet, the recessed portion being recessed toward the lower plastic.

[0012] According to one embodiment of the present invention, the aluminum sheet is provided with a mounting hole, and the explosion-proof valve is installed in the mounting hole.

[0013] According to one embodiment of the present invention, a protective patch is provided on the side of the explosion-proof valve opposite to the mounting hole.

[0014] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the thickness of the first boss portion and the thickness of the second boss portion are greater than the height of the pole post.

[0015] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0016] According to the battery cell cover plate provided in the first aspect of this utility model, the deformation of the first and second protrusions due to stress changes during charge and discharge cycles is transmitted to the surrounding area through the aluminum sheet. The reinforcing structure, by increasing the thickness of the material surrounding the explosion-proof valve or changing the stress distribution path, blocks the transmission of deformation, reduces warping or displacement of the explosion-proof valve's mounting edge, and ensures that its sealing performance is not affected by the deformation of the first and second protrusions. The reinforcing structure enhances the rigidity of the aluminum sheet surrounding the explosion-proof valve, significantly reducing stress concentration at the weld edge when the internal pressure of the battery cell fluctuates repeatedly. This avoids welding failure due to fatigue of the thinned aluminum sheet, extends the pressure cycle life of the explosion-proof valve, and ensures that it can still accurately respond to pressure anomalies after long-term use. Stable explosion-proof valve performance reduces the risk of premature battery cell failure due to pressure anomalies; the reinforcing structure improves the overall deformation resistance of the aluminum sheet, reducing electrolyte leakage or electrode pressure problems caused by cover plate deformation, indirectly reducing the rate of battery cell capacity decay. Meanwhile, the heat dissipation function of the first and second protrusions works synergistically with the safety guarantee of the explosion-proof valve, enabling the battery cell to maintain stable performance under harsh operating conditions and extending its overall service life. The high heat dissipation efficiency of the first and second protrusions, combined with the deformation resistance of the reinforcing structure, resolves the contradiction between improving heat dissipation and weakening the structure in traditional thin aluminum sheets. This allows the battery cell to efficiently dissipate heat through the first and second protrusions while ensuring the long-term reliability of the explosion-proof valve through the reinforcing structure, thus balancing fast charging requirements with safety performance.

[0017] According to the battery provided in the second aspect embodiment of this utility model, the casing provides rigid support for the cell cover plate, and works in conjunction with the reinforcing structure of the cover plate to further reduce the deformation transmission of the first and second protrusions, significantly improving the fatigue resistance of the aluminum sheet around the explosion-proof valve. During battery charge-discharge cycles or when subjected to external impacts, the stable connection between the cover plate and the casing prevents the explosion-proof valve from failing to seal due to excessive deformation, ensuring the integrity of the battery's internal structure. The reinforcing structure alleviates the impact of protrusion deformation on the explosion-proof valve, reducing premature battery failure due to explosion-proof valve failure; the stable assembly of the casing and cover plate prevents pressure on the electrode assembly or electrolyte leakage, reducing the rate of cell capacity decay. Furthermore, the efficient heat dissipation of the second protrusion and the safety guarantee of the explosion-proof valve work together to ensure stable battery performance under harsh conditions such as fast charging, extending the overall cycle life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0020] Figure 2 This is a schematic exploded view of the battery cell cover plate provided by this utility model.

[0021] Figure 3 This is a schematic top view of the first type of battery cell cover provided by this utility model.

[0022] Figure 4 This is a schematic top view of the second type of battery cell cover provided by this utility model.

[0023] Figure 5 This is a schematic top view of the third type of battery cell cover provided by this utility model.

[0024] Figure 6 This is a schematic top view of the fourth type of battery cell cover provided by this utility model.

[0025] Figure 7 This is a schematic enlarged view of the explosion-proof valve and protective patch provided by this utility model.

[0026] Figure 8 This is a schematic enlarged view of the first reinforcing mechanism provided by this utility model.

[0027] Figure 9 This is a schematic enlarged view of the second type of reinforcing mechanism provided by this utility model.

[0028] Figure 10 This is a schematic enlarged view of the third type of reinforcing mechanism provided by this utility model.

[0029] Figure 11 This is a schematic enlarged view of the fourth type of reinforcing mechanism provided by this utility model.

[0030] Figure 12 This is a schematic enlarged view of the fifth type of reinforcing mechanism provided by this utility model.

[0031] Figure 13 This is a schematic enlarged view of the sixth reinforcing mechanism provided by this utility model.

[0032] Figure label: 100. Lower plastic sheet; 102. Plain aluminum sheet; 104. First boss; 106. Second boss; 108. Explosion-proof valve; 110. Reinforcing structure; 112. Mounting hole; 114. Protective patch; 116. Terminal post. Detailed Implementation

[0033] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0034] like Figures 1 to 13 As shown, the first aspect of this utility model provides a battery cell cover plate, comprising: 100g of plastic; A light aluminum sheet 102 has a first side surface mounted on a lower plastic 100, and a second side surface of the light aluminum sheet 102 has a first boss portion 104 and a second boss portion 106 protruding in a direction away from the lower plastic 100. An explosion-proof valve 108 is installed on a light aluminum sheet 102 and located between the first boss portion 104 and the second boss portion 106. A reinforcing structure 110 is provided on the light aluminum sheet 102 at a position corresponding to the explosion-proof valve 108.

[0035] According to the battery cell cover plate provided in the first aspect embodiment of this utility model, the deformation of the first boss portion 104 and the second boss portion 106 due to stress changes during charge and discharge cycles is transmitted to the surrounding area through the aluminum sheet 102. The reinforcing structure 110, by increasing the thickness of the material surrounding the explosion-proof valve 108 or changing the stress distribution path, blocks the transmission of deformation, reduces the warping or displacement of the mounting edge of the explosion-proof valve 108, and ensures that its sealing performance is not affected by the deformation of the first boss portion 104 and the second boss portion 106. The reinforcing structure 110 enhances the rigidity of the aluminum sheet 102 surrounding the explosion-proof valve 108, significantly reducing the stress concentration at the weld edge of the explosion-proof valve 108 when the internal pressure of the battery cell fluctuates repeatedly. This avoids welding failure caused by fatigue of the thin aluminum sheet 102, extends the number of pressure cycles that the explosion-proof valve 108 can withstand, and ensures that it can still accurately respond to pressure anomalies after long-term use. The stable performance of the explosion-proof valve 108 reduces the risk of premature cell failure due to abnormal pressure. The reinforcing structure 110 improves the overall deformation resistance of the aluminum sheet 102, reducing electrolyte leakage or electrode pressure problems caused by cover deformation, indirectly reducing the rate of cell capacity decay. Simultaneously, the heat dissipation function of the first protrusion 104 and the second protrusion 106, in conjunction with the safety guarantee of the explosion-proof valve 108, enables the cell to maintain stable performance under harsh operating conditions, extending its overall service life. The high heat dissipation efficiency of the first protrusion 104 and the second protrusion 106, combined with the deformation resistance of the reinforcing structure 110, resolves the contradiction between improved heat dissipation and structural weakening in traditional thinned aluminum sheets 102. This allows the cell to efficiently dissipate heat through the first protrusion 104 and the second protrusion 106 while ensuring the long-term reliability of the explosion-proof valve 108 through the reinforcing structure 110, balancing fast charging requirements with safety performance.

[0036] Please continue reading Figures 1 to 13The battery cell cover provided in the first aspect of this utility model solves the problem of the effect of the deformation of the first boss portion 104 and the second boss portion 106 on the explosion-proof valve 108 by setting a reinforcing structure 110 around the explosion-proof valve 108.

[0037] The lower plastic 100 can be made of high-temperature resistant insulating material, which is injection molded to cover the first side of the light aluminum sheet 102, leaving only the installation area of ​​the explosion-proof valve 108 and the first boss 104 and the second boss 106 exposed, so as to achieve electrical isolation and structural support.

[0038] The aluminum sheet 102 can be made of high-ductility aluminum alloy. The first side of the aluminum sheet 102 is tightly fitted with the lower plastic 100, and the second side of the aluminum sheet 102 is stamped to form two independent bosses. The first boss 104 and the second boss 106 are located at both ends of the aluminum sheet 102, respectively, and are used to install the pole post 116 and the heat dissipation component. A flat area is formed between them for installing the explosion-proof valve 108.

[0039] The reinforcing structure 110 is set around the explosion-proof valve 108 in the flat area of ​​the aluminum sheet 102. The first boss 104, the second boss 106 and the reinforcing structure 110 can be formed by the same stamping process to ensure the overall mechanical properties of the aluminum sheet 102 are coordinated. A gap can also be reserved between the reinforcing structure 110 and the lower plastic 100 to avoid interfering with the thermal expansion and contraction of the aluminum sheet 102, while not affecting the pressure response of the explosion-proof valve 108.

[0040] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 along its length.

[0041] In one embodiment of this utility model, a reinforcing structure 110 is provided on the left or right side of the explosion-proof valve 108 along the length direction of the aluminum sheet 102 (i.e., the long side direction of the cell cover). The reinforcing structure 110 is a strip-shaped protrusion parallel to the edge of the explosion-proof valve 108. The bottom of the protrusion transitions to the body of the aluminum sheet 102 through an arc, and is integrally formed with the aluminum sheet 102 by a stamping process.

[0042] The strip-shaped reinforcing structure 110 effectively prevents the deformation of the first boss portion 104 and the second boss portion 106 along the length direction from being transmitted to the explosion-proof valve 108, reducing the stress generated at the welded edge of the explosion-proof valve 108 due to the stretching of the aluminum sheet 102, and preventing a decrease in its sealing performance. The reinforcement along the length direction increases the material rigidity on one side of the explosion-proof valve 108. During the charge and discharge cycles of the battery cell, the amplitude of repeated deformation of the aluminum sheet 102 in this area is reduced, lowering the risk of cracks appearing around the explosion-proof valve 108 and extending its effective working time.

[0043] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 in the width direction.

[0044] In one embodiment of this utility model, a reinforcing structure 110 is provided at the front or rear end of the explosion-proof valve 108 along the width direction of the aluminum sheet 102. The reinforcing structure 110 can be recessed, with the recessed edge transitioning to the rounded corner of the aluminum sheet 102 and formed by a stamping process.

[0045] The recessed reinforcing structure 110 disperses the stress in the width direction to both sides, preventing stress concentration at the welding points of the explosion-proof valve 108, reducing fatigue deformation of the aluminum sheet 102 in this direction, and ensuring the pressure response accuracy of the explosion-proof valve 108. The reinforcing structure 110 in the width direction avoids contact with the second protrusion 106, which contacts the water-cooling plate. This enhances the stability of the explosion-proof valve 108 without affecting the heat dissipation function of the aluminum sheet 102, thus balancing safety and heat dissipation efficiency.

[0046] According to one embodiment of the present invention, a reinforcing structure 110 is formed on at least one side of the explosion-proof valve 108 in the length and width directions.

[0047] In one embodiment of this utility model, reinforcing structures 110 are arranged along both the length and width directions of the explosion-proof valve 108. The reinforcing structures 110 on both sides of the length direction can be strip-shaped protrusions, and the reinforcing structures 110 on both sides of the width direction can be semi-annular recesses, forming a rectangular reinforcing area surrounding the explosion-proof valve 108, so as to avoid the deformation of the first protrusion 104 and the second protrusion 106 directly contacting and affecting the operation of the explosion-proof valve 108.

[0048] According to one embodiment of the present invention, the reinforcing structure 110 includes a protrusion formed on the aluminum sheet 102, the protrusion protruding in a direction away from the lower plastic 100.

[0049] In one embodiment of this utility model, the protrusion is in the shape of a rib and is formed on the aluminum sheet 102 by continuous stamping to ensure a smooth transition with the body of the aluminum sheet 102.

[0050] The raised, rib-like protrusions increase the effective thickness of the aluminum sheet 102 surrounding the explosion-proof valve 108, improving the bending resistance of this area and reducing the tilting of the explosion-proof valve 108 caused by the deformation of the first protrusion 104 and the second protrusion 106, thus ensuring the accuracy of its pressure response. The raised, rib-like protrusions effectively disperse stress, preventing it from concentrating at the edge of the explosion-proof valve 108. During intense charging and discharging of the battery cell, this reduces fatigue damage at the weld points of the explosion-proof valve 108 and increases the number of breath fatigue cycles.

[0051] According to one embodiment of the present invention, the reinforcing structure 110 includes a recess formed on the aluminum sheet 102, the recess being recessed toward the lower plastic 100.

[0052] In one embodiment of this utility model, the reinforcing structure 110 is recessed and distributed around the explosion-proof valve 108, and can also be formed on the aluminum sheet 102 by stamping.

[0053] The recessed reinforcing structure 110 can absorb the stress transmitted by the first boss portion 104 and the second boss portion 106 through the plastic deformation of the material, reducing the rigid deformation around the explosion-proof valve 108 and slowing down the fatigue accumulation rate of the aluminum sheet 102 under cyclic stress. The recessed reinforcing structure 110 improves the deformation resistance by changing the local structure without increasing the overall weight of the aluminum sheet 102, avoiding an increase in the weight of the cell cover plate due to reinforcement, thus balancing structural strength and energy density.

[0054] According to one embodiment of the present invention, an installation hole 112 is provided on the aluminum sheet 102, and the explosion-proof valve 108 is installed in the installation hole 112.

[0055] In one embodiment of this utility model, the mounting hole 112 is a stepped hole, located in the central region between the first boss portion 104 and the second boss portion 106, and the explosion-proof valve 108 can be fixed to the stepped surface by laser welding.

[0056] The stepped surface of the mounting hole 112 provides precise positioning for the explosion-proof valve 108. Combined with the surrounding reinforcing structure 110, it reduces the risk of tearing in the welded area caused by the deformation of the aluminum sheet 102, ensuring that the explosion-proof valve 108 maintains a long-term seal. The coordinated design of the mounting hole 112 and the reinforcing structure 110 allows the explosion-proof valve 108 to directly sense changes in the internal pressure of the battery cell, unaffected by the deformation of the aluminum sheet 102. The pressure response error is controlled within a small range, ensuring reliable operation under the preset pressure.

[0057] According to one embodiment of the present invention, a protective patch 114 is provided on the side of the explosion-proof valve 108 away from the mounting hole 112.

[0058] In one embodiment of this utility model, the protective patch 114 is a circular film made of heat-resistant polyimide material. The patch can be adhered to the top surface of the aluminum sheet 102 with high-temperature resistant adhesive, completely covering the explosion-proof valve 108 and the surrounding reinforcing structure 110.

[0059] The protective patch 114 can prevent dust, electrolyte droplets, and other foreign objects from contacting the explosion-proof valve 108, avoiding contamination or corrosion of its sealing surface, reducing premature failure of the explosion-proof valve 108 due to surface damage, and extending its service life in conjunction with the reinforcing structure 110. When the explosion-proof valve 108 is activated, the protective patch 114 breaks before the explosion-proof valve 108, which can buffer the impact of high-pressure airflow on the explosion-proof valve 108, reduce the damage of flying fragments to the aluminum sheet 102 and the reinforcing structure 110, and maintain the overall structural integrity of the cover plate.

[0060] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet 102, the thickness of the first boss portion 104 and the thickness of the second boss portion 106 are greater than the height of the pole post 116.

[0061] In one embodiment of this utility model, the protrusion height of the first boss portion 104 and the second boss portion 106 along the thickness direction of the aluminum sheet 102 is greater than the height of the pole post 116. For example, when the height of the pole post 116 is 2 mm, the thickness of the first boss portion 104 and the second boss portion 106 can be 2.5-3.5 mm.

[0062] The thickness of the first protrusion 104 and the second protrusion 106 is greater than the height of the electrode post 116, ensuring effective contact with the water-cooling plate to improve heat dissipation. Simultaneously, the reinforcing structure 110 balances the impact of protrusion deformation on the explosion-proof valve 108, ensuring that heat dissipation performance and explosion-proof reliability do not interfere with each other. The height design of the first protrusion 104 and the second protrusion 106 maintains a distance between the electrode post 116 mounting area and the explosion-proof valve 108. Combined with the reinforcing structure 110, this prevents stress from the electrode post 116 during charging and discharging from being transmitted to the explosion-proof valve 108, ensuring independent and stable function for both and extending the overall lifespan of the battery cell.

[0063] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0064] According to the battery provided in the second aspect embodiment of this utility model, the casing provides rigid support for the cell cover plate, and works in conjunction with the reinforcing structure 110 of the cover plate to further reduce the deformation transmission of the first and second protrusion portions 106, thereby significantly improving the fatigue resistance of the aluminum sheet 102 around the explosion-proof valve 108. During battery charge-discharge cycles or when subjected to external impacts, the stable connection between the cover plate and the casing prevents the explosion-proof valve 108 from failing to seal due to excessive deformation, ensuring the integrity of the battery's internal structure. The reinforcing structure 110 alleviates the impact of protrusion deformation on the explosion-proof valve 108, reducing premature battery failure due to the failure of the explosion-proof valve 108; the stable assembly of the casing and the cover plate prevents pressure on the electrode assembly or electrolyte leakage, reducing the rate of cell capacity decay. Furthermore, the efficient heat dissipation of the second protrusion portion 106, in conjunction with the safety guarantee of the explosion-proof valve 108, enables the battery to maintain stable performance under harsh conditions such as fast charging, extending the overall cycle life.

[0065] The battery provided in the second aspect of this utility model integrates the cell cover plate with the reinforcing structure 110 with the casing to form an energy storage device that combines safety protection and structural stability.

[0066] The battery includes a casing, a cell body, and the aforementioned cell cover plate. The casing is a square or cylindrical hollow structure with one open end, made of aluminum alloy or high-strength engineering plastic, and houses the cell body inside. The cell cover plate is fixed to the open end of the casing by laser welding or sealing adhesive bonding. A butyl rubber sealing gasket is placed between the edge of the cover plate and the casing to ensure the liquid and air tightness of the internal space and prevent electrolyte leakage.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell cover plate, characterized in that, include: Plastic bottom; A light aluminum sheet, wherein a first side of the light aluminum sheet is mounted on the lower plastic, and a second side of the light aluminum sheet is formed with a first boss portion and a second boss portion protruding in a direction away from the lower plastic; An explosion-proof valve is installed on the aluminum sheet and located between the first boss portion and the second boss portion. A reinforcing structure is provided on the aluminum sheet at the position corresponding to the explosion-proof valve.

2. The cell cover plate according to claim 1, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve along its length.

3. The cell cover plate according to claim 1, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve in the width direction.

4. The cell cover plate according to claim 1, characterized in that, The reinforcing structure is formed on at least one side of the explosion-proof valve in the length and width directions.

5. The cell cover plate according to any one of claims 1 to 4, characterized in that, The reinforcing structure includes a protrusion formed on the aluminum sheet, the protrusion protruding away from the lower plastic.

6. The cell cover plate according to any one of claims 1 to 4, characterized in that, The reinforcing structure includes a recess formed on the aluminum sheet, the recess being recessed toward the lower plastic.

7. The cell cover plate according to any one of claims 1 to 4, characterized in that, The aluminum sheet has mounting holes, and the explosion-proof valve is installed in the mounting holes.

8. The cell cover plate according to claim 7, characterized in that, A protective patch is provided on the side of the explosion-proof valve opposite to the mounting hole.

9. The cell cover plate according to any one of claims 1 to 4, characterized in that, Along the thickness direction of the aluminum sheet, the thickness of the first boss portion and the thickness of the second boss portion are greater than the height of the pole post.

10. A battery, characterized in that, It includes a housing on which a cell cover plate as described in any one of claims 1 to 9 is mounted.

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