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 boss portion that protrude towards the direction away from lower plastic, boss portion is used to install pole and explosion-proof valve.The electric core cover plate enhances the overall rigidity of light aluminum sheet, reduces the planar deformation caused by the internal pressure change or external impact of electric core;For pole and explosion-proof valve provides rigid installation foundation, reduces the probability that both are involved due to light aluminum sheet deformation;Reduce the stress concentration of the periphery of explosion-proof valve, when explosion-proof valve repeatedly opens and closes due to the internal pressure fluctuation of electric core, boss portion can buffer deformation stress, avoid the sealing edge of explosion-proof valve due to fatigue prematurely fails, extend its effective working frequency.Can avoid the capacity attenuation caused by the pressure of pole group;The stable installation of pole and explosion-proof valve reduces the risk of poor contact or sealing failure.

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 the field of battery technology, the thickness of the cell cover is appropriately reduced to decrease overall battery weight and increase energy density. However, this thinning also affects the strength of the cell to some extent, especially the central section where the terminals and explosion-proof valve are installed. Because the terminals and explosion-proof valve require a certain amount of installation space, and because of the need for monitoring and releasing internal battery pressure, the structural strength of this central area is relatively weak. Therefore, when the internal pressure of the battery exceeds the set value of the explosion-proof valve, the weakness in this area may cause the explosion-proof valve to crack or even fail completely, affecting the battery's safety performance.

[0003] Especially in the design of high-power and high-energy-density batteries, this structural weakness has become a significant bottleneck in the performance improvement process. On the one hand, weight can be reduced and energy density increased by thinning the cell cover; on the other hand, it is necessary to ensure that the battery can safely release internal pressure under abnormal conditions. Therefore, how to maintain the thinning of the cell cover while ensuring the safety performance of the critical central area has become an urgent problem to be solved in the current technological field. Utility Model Content

[0004] This utility model provides a cell cover plate to solve the defect in related technologies where cell cover plates cannot simultaneously achieve both structural strength and energy density.

[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, the first side of which is mounted on the lower plastic, and the second side of which has a boss protruding in a direction away from the lower plastic, the boss being used to mount the pole and the explosion-proof valve.

[0007] According to one embodiment of the present invention, the thickness H of the boss portion is in the range of 2mm along the thickness direction of the boss portion. <H<4mm。

[0008] According to one embodiment of the present invention, the battery cell cover further includes a cover body, and the lower plastic is installed on the cover body; Along the length of the boss portion, the distance W1 between the edge of the boss portion and the edge of the cover plate body ranges from 0 mm. <W1<6mm。

[0009] According to one embodiment of the present invention, the distance W2 between the edge of the boss portion and the edge of the cover plate body is 0 mm along the width direction of the boss portion. <W2<6mm。

[0010] According to one embodiment of the present invention, the boss portion has a receiving cavity formed on the side facing the lower plastic for accommodating the pole post and / or pole tab.

[0011] According to one embodiment of the present invention, the boss portion is provided with a mounting hole, and the explosion-proof valve is installed in the mounting hole.

[0012] According to one embodiment of the present invention, a protective patch is also provided on the side of the explosion-proof valve away from the boss portion.

[0013] According to one embodiment of the present invention, a first connecting hole is provided on the lower plastic sheet, a second connecting hole is provided on the aluminum sheet, and the pole post is adapted to pass through the first connecting hole and the second connecting hole in sequence and be connected to the riveting block.

[0014] According to one embodiment of the present invention, the boss portion is integrally formed with the aluminum sheet.

[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 first aspect of the present invention, the protruding portion, through a three-dimensional structure formed by stamping, enhances the overall rigidity of the aluminum sheet and reduces planar deformation caused by changes in internal pressure of the battery cell or external impact. Compared with a planar structure, the supporting effect of the protruding portion can disperse stress, preventing wrinkles or depressions in the aluminum sheet around the electrode and explosion-proof valve, ensuring the overall structural stability of the cover plate. The protruding portion provides a rigid mounting base for the electrode and explosion-proof valve, reducing the probability of both being affected by deformation of the aluminum sheet. The electrode is welded to the top surface of the protruding portion, and under stress, the overall strength of the protruding portion can resist tilting or loosening; the fixed edge of the explosion-proof valve is less prone to warping due to the support of the protruding portion, ensuring long-term stable sealing performance. The protruding portion reduces stress concentration around the explosion-proof valve. When the explosion-proof valve is repeatedly opened and closed due to fluctuations in internal pressure of the battery cell, the protruding portion can buffer deformation stress, preventing the sealing edge of the explosion-proof valve from failing prematurely due to fatigue, and extending its effective working cycle. Therefore, the enhanced resistance to deformation of the aluminum sheet can reduce the compression of the internal space of the cell caused by the deformation of the cover plate, and avoid capacity decay caused by pressure on the electrode assembly. At the same time, the stable installation of the electrode post and explosion-proof valve reduces the risk of poor contact or sealing failure, ensures the energy conversion efficiency during the charging and discharging process of the cell, and indirectly ensures the effective utilization of the cell capacity.

[0017] According to the battery provided in the second aspect embodiment of this utility model, the protrusion of the cell cover plate enhances the deformation resistance of the aluminum sheet and forms a cooperative support with the rigid connection of the shell, reducing the deformation of the cover plate under charging, discharging, vibration, or impact conditions, preventing the internal electrode assembly of the shell from being compressed or displaced, and ensuring the structural integrity of the cell body. The protrusion provides a rigid mounting base for the explosion-proof valve. Combined with the closed space design of the shell, it ensures that the explosion-proof valve operates accurately when the internal pressure of the battery is abnormal, and the pressure release path is unobstructed. At the same time, the stable installation of the electrode posts reduces the risk of local overheating caused by poor contact and improves the safety redundancy of the battery. 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 front view of the battery cell cover plate provided by this utility model.

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

[0023] Figure label: 100. Lower plastic part; 102. Plain aluminum sheet; 104. Boss part; 106. Pole post; 108. Explosion-proof valve; 110. Mounting hole; 112. Protective patch; 114. First connecting hole; 116. Second connecting hole; 118. Riveting block. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 4 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 mounted on a lower plastic 100, and a second side of the light aluminum sheet 102 has a boss portion 104 protruding in a direction away from the lower plastic 100. The boss portion 104 is used to mount the pole post 106 and the explosion-proof valve 108.

[0026] According to the battery cell cover plate provided in the first aspect embodiment of this utility model, the boss portion 104, through a three-dimensional structure formed by stamping, enhances the overall rigidity of the aluminum sheet 102 and reduces planar deformation caused by changes in internal pressure of the battery cell or external impact. Compared with a planar structure, the supporting effect of the boss portion 104 can disperse stress and prevent wrinkles or depressions from appearing around the electrode post 106 and the explosion-proof valve 108 on the aluminum sheet 102, ensuring the overall structural stability of the cover plate. The boss portion 104 provides a rigid mounting base for the electrode post 106 and the explosion-proof valve 108, reducing the probability of both being affected by deformation of the aluminum sheet 102. The electrode post 106 is welded to the top surface of the boss portion 104, and under stress, the overall strength of the boss portion 104 can resist tilting or loosening; the fixed edge of the explosion-proof valve 108 is not prone to warping due to the support of the boss portion 104, ensuring long-term stable sealing performance. The protrusion 104 reduces stress concentration around the explosion-proof valve 108. When the explosion-proof valve 108 repeatedly opens and closes due to internal pressure fluctuations in the battery cell, the protrusion 104 can buffer deformation stress, preventing premature failure of the sealing edge of the explosion-proof valve 108 due to fatigue and extending its effective operating cycle. Therefore, the enhanced deformation resistance of the aluminum sheet 102 reduces internal space compression in the battery cell caused by cover deformation, preventing capacity decay caused by pressure on the electrode assembly. Simultaneously, the stable installation of the electrode post 106 and the explosion-proof valve 108 reduces the risk of poor contact or sealing failure, ensuring energy conversion efficiency during battery cell charging and discharging, and indirectly guaranteeing the effective utilization of the battery cell capacity.

[0027] Please continue reading Figures 1 to 4 The battery cell cover provided in the first aspect of this utility model optimizes the installation stability of the electrode post 106 and the explosion-proof valve 108 through the structured design of the aluminum sheet 102.

[0028] The lower plastic 100 can be made of high-temperature resistant insulating material and is fixed to the bottom of the cell cover plate by injection molding, providing an installation reference surface for the aluminum sheet 102 and achieving insulation isolation between the inside and outside of the cell.

[0029] The aluminum sheet 102 can be made of high-purity aluminum alloy sheet, which has good conductivity and ductility. Its first side is tightly attached to the lower plastic 100, and the second side is formed into an upwardly protruding boss 104 by a stamping process.

[0030] The bosses 104 are distributed along the length of the aluminum sheet 102, and are arranged in a long strip or in sections. The top surface of the bosses 104 is flat.

[0031] The pole post 106 can be fixed to the boss portion 104 by laser welding, and the explosion-proof valve 108 can be fixed to the boss portion 104 by sealant or welding. Both are electrically connected to the aluminum sheet 102. The raised structure of the boss portion 104 makes the mounting surfaces of the pole post 106 and the explosion-proof valve 108 higher than the body of the aluminum sheet 102, forming a physical protective space.

[0032] According to one embodiment of the present invention, the thickness H of the boss portion 104 is in the range of 2mm along the thickness direction. <H<4mm。

[0033] In one embodiment of this utility model, the dimension of the boss portion 104 along the thickness direction (i.e., the protrusion height) is strictly controlled between 2mm and 4mm. This thickness is formed in one step by a stamping process. The parallelism error between the top surface of the boss portion 104 and the body of the aluminum sheet 102 does not exceed 0.1mm, and the side perpendicularity error is ≤0.05mm. The thickness selection needs to match the installation height of the pole post 106 and the explosion-proof valve 108: after welding, the top of the pole post 106 is flush with the top surface of the boss portion 104, and the overall height of the explosion-proof valve 108 after assembly does not exceed 1.2 times the thickness of the boss portion 104, ensuring that there is no additional protrusion interference after the two are installed.

[0034] The 2-4mm thickness provides effective mechanical support for the boss 104, significantly improving its bending resistance compared to a thinner (<2mm) structure. This allows it to withstand higher internal pressure impacts without deformation, indirectly enhancing the overall deformation resistance of the aluminum sheet 102. The thickness design provides ample installation space for the pole post 106 and the explosion-proof valve 108, avoiding stress concentration during assembly due to limited space, reducing the risk of component deformation due to compression, and ensuring functional stability. The thickness is controlled within a reasonable range, avoiding increased cell cover weight due to excessive thickness (>4mm) while meeting structural strength requirements, balancing energy density and safety.

[0035] According to one embodiment of the present invention, the battery cell cover further includes a cover body, and a lower plastic 100 is installed on the cover body; along the length direction of the boss portion 104, the distance W1 between the edge of the boss portion 104 and the edge of the cover body is 0 mm. <W1<6mm。

[0036] In one embodiment of this utility model, the cover plate body has a frame-type structure, with the lower plastic 100 embedded in its groove, and the edge of the aluminum sheet 102 fixed to the cover plate body by a snap fastener. Along the length direction of the boss portion 104 (i.e., the long side direction of the cell cover plate), the straight-line distance W1 between the edge of the boss portion 104 (the side away from the center) and the edge of the cover plate body is set to 0-6mm. This distance is ensured by mold positioning, with the error controlled within ±0.3mm, ensuring that the boss portion 104 does not contact the cover plate body and leaves a small buffer space.

[0037] A 0-6mm spacing avoids a direct rigid connection between the boss 104 and the cover plate body. When the battery cell expands due to impact or temperature changes, the spacing buffers the deformation stress, reducing the central deformation of the aluminum sheet 102 caused by edge constraints and protecting the installation stability of the electrode post 106 and the explosion-proof valve 108. A spacing of less than 6mm avoids structural redundancy, ensuring that the boss 104 is within the effective support range of the cover plate body, enhancing the overall structural strength, and reserving space for the arrangement of electrode post 106 leads, explosion-proof valve 108 pipelines, etc. The small spacing is compatible with component processing errors, avoiding interference between the boss 104 and the cover plate body due to dimensional deviations, reducing assembly difficulty, and ensuring production yield.

[0038] According to one embodiment of the present invention, the distance W2 between the edge of the boss portion 104 and the edge of the cover plate body is 0 mm along the width direction of the boss portion 104. <W2<6mm。

[0039] In one embodiment of this utility model, the distance W2 between the edge of the boss portion 104 and the edge of the cover body is also set to 0-6mm along the width direction of the boss portion 104 (i.e., the short side direction of the cell cover).

[0040] Similar to the length direction, a reasonable spacing in the width direction can buffer the deformation stress in that direction, preventing the boss 104 from being squeezed and deformed in the width direction, ensuring that the mounting surfaces of the pole 106 and the explosion-proof valve 108 remain flat, and reducing poor contact caused by tilting. The adjustable range of 0-6mm can adapt to cover plate body designs of different widths, enhancing structural versatility, while reserving space for components such as heat dissipation channels and sealing strips in the width direction, improving the functional integration of the cell cover plate.

[0041] According to one embodiment of the present invention, the boss portion 104 has a receiving cavity for accommodating the pole post 106 and / or the tab on the side facing the lower plastic 100.

[0042] In one embodiment of this utility model, the side of the boss 104 facing the lower plastic 100 (i.e., the first side of the aluminum sheet 102) is stamped to form a recessed receiving cavity, the inner wall of the cavity is smooth and the edges are rounded. The size of the receiving cavity is designed according to the shape of the pole post 106 and the tab: the depth of the area where the pole post 106 is placed is 0.2-0.5mm greater than the thickness of the bottom of the pole post 106, and the width of the area where the tab is placed is 1-2mm greater than the width of the tab, ensuring that the two do not contact the cavity wall after being placed, and leaving space for the installation of the insulating sleeve.

[0043] The receiving cavity physically isolates the bottom of the pole post 106 and the tab from the lower plastic 100, preventing the deformation of the lower plastic 100 from being directly transmitted to the pole post 106 / tab, reducing bending or poor contact caused by compression, and preventing short circuits between the tab and other areas of the aluminum sheet 102. The recessed structure of the receiving cavity makes the boss portion 104 form a box-shaped cross-section with a "convex top and concave bottom". Compared with a flat structure, the torsional resistance of this area is significantly improved, which can better resist the local stress generated by welding of the pole post 106 or the operation of the explosion-proof valve 108, and improve the deformation resistance of the aluminum sheet 102. The receiving cavity can serve as an assembly positioning reference, facilitating the rapid alignment and installation of the pole post 106 and the tab, reducing assembly errors, and improving production efficiency.

[0044] According to one embodiment of the present invention, a mounting hole 110 is provided on the boss portion 104, and the explosion-proof valve 108 is installed in the mounting hole 110.

[0045] In one embodiment of this utility model, a circular mounting hole 110 is provided at a preset position of the boss portion 104, and the diameter of the hole is 0.1-0.2 mm larger than the sealing edge diameter of the explosion-proof valve 108. The explosion-proof valve 108 can be fixed to the stepped surface by laser welding to ensure that the explosion-proof valve 108 is subjected to uniform force.

[0046] The design of the mounting hole 110 and the stepped surface allows the explosion-proof valve 108 to form a surface contact with the boss portion 104. Compared with traditional flat mounting, the contact area is increased, the pull-out resistance is significantly improved, and the edge warping of the explosion-proof valve 108 due to vibration or pressure impact is reduced, ensuring sealing performance. The rigid support of the boss portion 104 ensures that the explosion-proof valve 108 only undergoes its own preset deformation under pressure (such as the breakage of the rupture disc), avoiding premature or delayed action caused by the deformation of the aluminum sheet 102, ensuring that the explosion-proof valve 108 opens accurately under the set pressure, and reducing the number of breath fatigue cycles. The precise fit between the mounting hole 110 and the explosion-proof valve 108 reduces the use of additional seals, lowers the risk of failure due to seal aging, and facilitates the replacement and maintenance of the explosion-proof valve 108.

[0047] According to one embodiment of the present invention, a protective patch 112 is also provided on the side of the explosion-proof valve 108 away from the boss portion 104.

[0048] In one embodiment of this invention, the protective patch 112 is a circular film, which may be made of polyimide material resistant to electrolyte corrosion. Its edges are adhered to the top surface of the boss portion 104 with pressure-sensitive adhesive, completely covering the explosion-proof valve 108 but not in direct contact with it. The surface of the protective patch 112 is printed with tear lines to facilitate rapid breakage when the explosion-proof valve 108 is activated.

[0049] The protective patch 112 prevents dust, electrolyte droplets, and other foreign matter from directly contacting the surface of the explosion-proof valve 108, avoiding contamination or corrosion of its sealing edges, extending the effective service life of the explosion-proof valve 108, and indirectly reducing the number of breath fatigue cycles. The flexible nature of the protective patch 112 buffers the airflow impact when the explosion-proof valve 108 opens, reducing the erosion damage of high-pressure gas on the edges of the explosion-proof valve 108, protecting its structural integrity, and ensuring effective sealing even after multiple operations. A breakage of the protective patch 112 visually indicates that the explosion-proof valve 108 has activated, facilitating quick identification of battery cell abnormalities by operators and reducing troubleshooting time.

[0050] According to one embodiment of the present invention, a first connecting hole 114 is provided on the lower plastic 100, and a second connecting hole 116 is provided on the light aluminum sheet 102. The pole post 106 is adapted to pass through the first connecting hole 114 and the second connecting hole 116 in sequence and connect with the riveting block (118).

[0051] In one embodiment of this utility model, the first connecting hole 114 of the lower plastic 100 is a stepped hole, and the second connecting hole 116 of the aluminum sheet 102 is a through hole. The pole post 106 has a stepped shaft structure, and after passing through the first connecting hole 114 and the second connecting hole 116 in sequence, the bottom is fixed to the riveting block (118) by a cold riveting process.

[0052] The mechanical fixing of the rivet block (118) to the electrode post 106, combined with the clamping effect of the aluminum sheet 102, significantly improves the pull-out resistance and torsional torque of the electrode post 106, reducing loosening of the electrode post 106 due to charging and discharging vibration or assembly stress, and improving its resistance to deformation. The tight connection ensures low contact resistance between the electrode post 106 and the aluminum sheet 102, reducing Joule heating during charging and discharging, avoiding aging of the material around the electrode post 106 due to local overheating, and indirectly ensuring the stability of the cell capacity. The first connecting hole 114 of the lower plastic 100 can isolate the electrode post 106 from other parts of the cover plate, avoiding the risk of short circuit. At the same time, the stepped hole structure can accommodate the sealing gasket, further improving the effect of preventing electrolyte leakage.

[0053] According to one embodiment of the present invention, the boss portion 104 is integrally formed with the aluminum sheet 102.

[0054] In one embodiment of this utility model, the boss portion 104 is integrally formed with the aluminum sheet 102 by a stamping process: continuous die stamping is used to pre-form a shallow pit, and then the boss portion 104 of a preset height is formed by secondary stretching, and finally trimmed and shaped. The transition area between the formed boss portion 104 and the aluminum sheet 102 body is an arc surface without wrinkles or cracks.

[0055] The one-piece molding eliminates the connection gap between the boss 104 and the aluminum sheet 102, forming a continuous, stress-bearing whole. This results in superior bending and impact resistance compared to a separate welded structure, and significantly enhances the overall deformation resistance of the aluminum sheet 102. The rounded design of the transition area avoids stress concentration caused by right-angle connections. When the internal pressure of the battery cell changes, the stress can be evenly distributed along the rounded surface, protecting the mounting areas of the pole post 106 and the explosion-proof valve 108 from deformation. The one-piece molding process ensures dimensional accuracy through the mold, resulting in good consistency in the position and shape of the boss 104. This reduces installation deviations of the pole post 106 or the explosion-proof valve 108 caused by accumulated assembly errors, improving product reliability.

[0056] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0057] According to the battery provided in the second aspect embodiment of this utility model, the boss portion 104 of the cell cover plate enhances the deformation resistance of the aluminum sheet 102 and forms a cooperative support with the rigid connection with the shell, reducing the deformation of the cover plate under charging, discharging, vibration or impact conditions, preventing the internal electrode assembly of the shell from being compressed or displaced, and ensuring the structural integrity of the cell body. The boss portion 104 provides a rigid mounting base for the explosion-proof valve 108. Combined with the closed space design of the shell, it ensures that the explosion-proof valve 108 operates accurately when the internal pressure of the battery is abnormal, and the pressure release path is unobstructed. At the same time, the stable installation of the terminal post 106 reduces the risk of local overheating caused by poor contact and improves the safety redundancy of the battery.

[0058] The battery provided in the second aspect of this utility model forms a complete energy storage device by integrating the above-mentioned cell cover plate and the casing.

[0059] The battery includes a casing, a cell body, and the aforementioned cell cover. The casing is a hollow structure with one open end, made of metal or high-strength plastic, and houses the cell body inside. The cell cover is installed at the open end of the casing through a sealing connection, forming a closed internal space of the battery. A sealing adhesive layer is provided between the edge of the cover and the casing to ensure that the electrolyte does not leak.

[0060] 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, the first side of which is mounted on the lower plastic, and the second side of which has a boss protruding in a direction away from the lower plastic, the boss being used to mount the pole and the explosion-proof valve.

2. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the boss portion, the thickness H of the boss portion ranges from 2mm. <H<4mm。 3. The cell cover plate according to claim 1, characterized in that, The cell cover also includes a cover body, and the lower plastic is installed on the cover body; Along the length of the boss portion, the distance W1 between the edge of the boss portion and the edge of the cover plate body ranges from 0 mm. <W1<6mm。 4. The cell cover plate according to claim 3, characterized in that, Along the width direction of the boss portion, the distance W2 between the edge of the boss portion and the edge of the cover plate body ranges from 0 mm. <W2<6mm。 5. The cell cover plate according to any one of claims 1 to 4, characterized in that, The boss portion has a receiving cavity formed on the side facing the lower plastic for accommodating the pole post and / or pole tab.

6. The cell cover plate according to any one of claims 1 to 4, characterized in that, The boss portion has a mounting hole, and the explosion-proof valve is installed in the mounting hole.

7. The cell cover plate according to claim 6, characterized in that, The explosion-proof valve is also provided with a protective patch on the side opposite to the boss.

8. The cell cover plate according to any one of claims 1 to 4, characterized in that, The lower plastic sheet has a first connecting hole, and the aluminum sheet has a second connecting hole. The pole is adapted to pass through the first connecting hole and the second connecting hole in sequence and be connected to the riveting block.

9. The cell cover plate according to any one of claims 1 to 4, characterized in that, The boss portion is integrally formed with the aluminum sheet.

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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