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 includes lower plastic;Aluminum sheet, the first side of aluminum sheet is installed in lower plastic, the second side of aluminum sheet is formed with the first boss portion and second boss portion that protrude towards the direction away from lower plastic, the first boss portion is used to install pole, and the second boss portion is used to be connected with water cooling plate thermal coupling.This electric core cover plate increases the contact pressure and heat conduction area with water cooling plate, reduces thermal resistance, so that the large amount of heat generated by electric core when fast charging can be quickly conducted to water cooling plate, avoid temperature sudden rise;The independent design of double boss portion makes the heat dissipation function and the electric function not interfere with each other;Second boss portion focuses on heat export, and the first boss portion ensures the mechanical and electrical properties of pole.This layout allows water cooling system to work efficiently when fast charging, while the pole area is not affected by the mechanical stress of the heat dissipation component.

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 past, the size and structural design of battery cells significantly limited the development of fast-charging performance. Specifically, the thickness of the cell could not exceed 2 millimeters, a standard generally followed in the industry, which directly affected the cell's energy density and heat dissipation performance. In existing technologies, for prismatic cells, directly mounting a water-cooling plate on top to reduce the terminal temperature is not feasible due to their structural characteristics. This is because installing a water-cooling plate would occupy significant space, affecting the overall structure and heat dissipation of the cell, thus failing to effectively reduce the terminal temperature.

[0003] This problem is particularly prominent during fast charging. When a battery is fast-charging, the temperature inside the cell typically rises very quickly due to the rapid increase in current, especially at the terminals where insufficient heat dissipation can lead to overheating. High temperatures significantly reduce the cell's charging efficiency and safety, limiting fast-charging capabilities. Therefore, effectively reducing the temperature of the terminals has become a key technical challenge for improving fast-charging performance. Utility Model Content

[0004] This utility model provides a battery cell cover plate to solve the defect in related technologies where battery cell cover plates cannot simultaneously achieve heat dissipation and fast charging performance.

[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. The first boss portion is used to install an electrode post, and the second boss portion is used to thermally couple with a water-cooling plate.

[0007] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the thickness of the second boss portion is greater than the height of the pole post.

[0008] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the thickness of the first boss portion is less than or equal to the sum of the height of the pole post and the height of the connecting piece.

[0009] According to one embodiment of the present invention, along the length direction of the aluminum sheet, the length of the first boss portion is greater than the length of the second boss portion.

[0010] According to one embodiment of the present invention, a first mounting hole for mounting the pole post is provided on the segment of the first boss portion that extends beyond the second boss portion along the length direction of the aluminum sheet.

[0011] According to one embodiment of the present invention, a second mounting hole is provided at the position corresponding to the first mounting hole in the lower plastic, and the pole post is adapted to pass through the second mounting hole and the first mounting hole in sequence.

[0012] According to one embodiment of the present invention, an upper plastic and a riveting block are installed on the segment of the pole that passes through the first mounting hole.

[0013] According to one embodiment of the present invention, the second protrusion is provided with a third mounting hole for installing an explosion-proof valve.

[0014] According to one embodiment of the present invention, a protective patch is provided on the side of the explosion-proof valve opposite to the third mounting hole.

[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 second protrusion increases the contact pressure and thermal conductivity area with the water-cooling plate, reducing thermal resistance and allowing the large amount of heat generated by the battery cell during fast charging (especially in the edge area of ​​the electrode assembly) to be quickly conducted to the water-cooling plate, preventing a sudden temperature rise. Simultaneously, the high thermal conductivity of the aluminum sheet ensures uniform heat diffusion within the cover plate, preventing the formation of localized hot spots and providing temperature protection for continuous high-power fast charging. The independent support structure of the first protrusion reduces the impact of aluminum sheet deformation on the electrode post during heat dissipation. Even when temperature changes cause thermal expansion and contraction, the electrode post maintains a stable connection with the electrode assembly, avoiding fluctuations in contact resistance. A stable electrical connection ensures smooth high-current transmission during fast charging, reducing power loss or localized overheating caused by poor contact. The independent design of the dual protrusions ensures that heat dissipation and conductivity functions do not interfere with each other; the second protrusion focuses on heat dissipation, while the first protrusion ensures the mechanical and electrical performance of the electrode post. This layout allows the water-cooling system to operate efficiently during fast charging, while the electrode post area is unaffected by the mechanical stress of the heat dissipation components. Efficient heat dissipation reduces temperature shock during fast charging, slowing down electrolyte decomposition and electrode aging; stable terminal connections prevent uneven current distribution during charging and discharging, reducing the risk of lithium dendrite formation. Together, these factors enable the cell to maintain a high capacity retention rate even after long-term fast-charging cycles, extending battery life.

[0017] According to the battery provided in the second aspect embodiment of this utility model, the rigid connection between the casing and the cell cover ensures stable contact between the second protrusion and the water-cooling plate, forming an efficient heat dissipation path. This allows heat inside the cell to be quickly dissipated during fast charging, controlling the cell temperature within a safe range and preventing high temperatures from limiting fast charging power. Simultaneously, the stable support of the first protrusion on the terminals ensures the reliability of high-current transmission, enabling the battery to withstand long-term fast charging conditions. The casing provides rigid support for the cell cover, reducing deformation of the double protrusions due to external impacts or internal pressure, indirectly enhancing the deformation resistance of the terminals and the explosion-proof valve. The corresponding design of the explosion-proof valve and the casing pressure relief channel ensures timely pressure relief when the cell experiences pressure increases due to fast charging anomalies, reducing the risk of thermal runaway. The presence of the protective patch further extends the effective service life of the explosion-proof valve. Efficient heat dissipation reduces electrolyte decomposition and electrode aging during fast charging, while the stable connection of the terminals prevents lithium dendrite growth caused by uneven current distribution. The synergistic effect of these two factors allows the battery to maintain a high capacity retention rate even after long-term fast charging cycles. The sealed design of the casing and cover reduces the risk of electrolyte leakage and ensures stable reactions inside the cell. 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. First boss part; 106. Second boss part; 108. Terminal post; 110. Connecting piece; 112. First mounting hole; 114. Second mounting hole; 116. Upper plastic part; 118. Riveting block; 120. Explosion-proof valve; 122. Third mounting hole; 124. Protective patch. 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. The second side 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. The first boss portion 104 is used to mount the pole post 108, and the second boss portion 106 is used for thermal coupling connection with a water cooling plate (not shown in the figure).

[0026] According to the battery cell cover provided in the first aspect embodiment of this utility model, the second protrusion 106 reduces thermal resistance by increasing the contact pressure and heat conduction area with the water-cooling plate, allowing the large amount of heat generated by the battery cell during fast charging (especially in the edge area of ​​the electrode group) to be quickly conducted to the water-cooling plate, avoiding a sudden temperature rise. Simultaneously, the high thermal conductivity of the aluminum sheet 102 ensures uniform heat diffusion within the cover, preventing the formation of local hot spots and providing temperature protection for continuous high-power fast charging. The independent support structure of the first protrusion 104 reduces the impact of the deformation of the aluminum sheet 102 on the electrode post 108 during heat dissipation. Even when temperature changes cause thermal expansion and contraction, the electrode post 108 can still maintain a stable connection with the electrode group, avoiding fluctuations in contact resistance. A stable electrical connection ensures smooth high-current transmission during fast charging, reducing power loss or localized overheating caused by poor contact. The independent design of the dual protrusions ensures that heat dissipation and conductivity functions do not interfere with each other; the second protrusion 106 focuses on heat dissipation, while the first protrusion 104 ensures the mechanical and electrical performance of the electrode post 108. This layout allows the water-cooling system to operate efficiently during fast charging, while the terminal 108 area is unaffected by the mechanical stress of the heat dissipation components. Efficient heat dissipation reduces temperature shock during fast charging, slowing electrolyte decomposition and electrode aging; the stable connection of the terminal 108 avoids uneven current distribution during charging and discharging, reducing the risk of lithium dendrite formation. Together, these factors enable the cell to maintain a high capacity retention rate even after long-term fast-charging cycles, extending battery life.

[0027] Please continue reading Figures 1 to 4 The battery cell cover provided in the first aspect of this utility model achieves coordinated optimization of the installation and heat dissipation functions of the electrode post 108 through the double protrusions provided on the aluminum sheet 102.

[0028] 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, exposing only the installation area of ​​the pole post 108 and the necessary conductive parts, so as to achieve electrical isolation between the inside and outside of the battery cell.

[0029] The aluminum sheet 102 can be made of high thermal conductivity aluminum alloy. The first side is tightly attached to the lower plastic 100, and the second side is formed into two independent boss structures through a stamping process.

[0030] The first boss 104 is located on one side of the aluminum sheet 102 and can be cylindrical or square. The top surface has a mounting hole for the pole post 108. The hole wall is treated with conductivity. The pole post 108 is fixed in the hole by laser welding and forms an electrical connection with the aluminum sheet 102.

[0031] The second protrusion 106 is located on the other side of the aluminum sheet 102. It can be long or rectangular. A thermally conductive silicone grease layer can also be applied to the surface of the second protrusion 106 for bonding with the external water-cooling plate.

[0032] The terminal post 108 extends through the lower plastic 100 into the cell and connects to the electrode lead; the second protrusion 106 makes close contact with the water-cooling plate on the outside of the casing during battery assembly, forming a heat dissipation path between the cell interior, the aluminum sheet 102, the second protrusion 106, and the water-cooling plate. The area of ​​the aluminum sheet 102 between the two protrusions retains a planar structure to ensure overall rigidity.

[0033] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet 102, the thickness of the second boss portion 106 is greater than the height of the pole post 108.

[0034] In one embodiment of this invention, along the thickness direction of the aluminum sheet 102, the thickness of the second boss portion 106 is greater than the height from the top of the pole post 108 to the second side surface of the aluminum sheet 102. For example, if the height of the pole post 108 is 2 mm, the thickness of the second boss portion 106 is designed to be 2.5-4 mm. This dimension is precisely controlled by a stamping die to ensure that the top surface of the second boss portion 106 is higher than the top of the pole post 108.

[0035] The thickness of the second protrusion 106 is greater than the height of the terminal post 108, allowing the water-cooling plate to preferentially and tightly fit with the second protrusion 106 during installation, without interference from the height of the terminal post 108. This ensures an effective heat dissipation path and avoids poor contact of the water-cooling plate caused by the protrusion of the terminal post 108. The higher second protrusion 106 increases the contact pressure with the water-cooling plate, reduces contact thermal resistance, and allows heat generated during fast charging to be dissipated more quickly, preventing excessively high temperatures around the terminal post 108 from affecting fast charging performance. The second protrusion 106, being higher than the terminal post 108, provides lateral protection for the terminal post 108 during battery assembly or use, reducing direct damage to the terminal post 108 from external impacts and maintaining its structural stability.

[0036] 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 is less than or equal to the sum of the height of the pole post 108 and the height of the connecting piece 110.

[0037] In one embodiment of this utility model, the thickness of the first boss portion 104 is related to the height of the pole post 108 and the height of the connecting piece 110 such that the thickness of the first boss portion 104 is less than or equal to the sum of the heights of the pole post 108 and the connecting piece 110. For example, if the height of the pole post 108 is 2 mm and the height of the connecting piece 110 is 1 mm, then the thickness of the first boss portion 104 is ≤ 3 mm. This dimension is calibrated using a mold to ensure that the overall height of the pole post 108 and the connecting piece 110 after assembly is not lower than the top surface of the first boss portion 104.

[0038] The thickness of the first protrusion 104 does not exceed the total height of the terminal post 108 and the connecting piece 110, preventing it from obstructing the installation space of the connecting piece 110, ensuring effective connection between the terminal post 108 and the external circuit, and guaranteeing smooth high-current transmission during fast charging. The reasonable height matching allows the force on the connecting piece 110 to be transmitted to the first protrusion 104 through the terminal post 108, preventing the connecting piece 110 from being squeezed and deformed due to the first protrusion 104 being too high, thus maintaining the stability of the electrical connection. This design allows the first protrusion 104, the terminal post 108, and the connecting piece 110 to form a compact layout, reducing the overall thickness of the cover plate, reserving more space inside the battery, and indirectly improving energy density.

[0039] According to one embodiment of the present invention, along the length direction of the aluminum sheet 102, the length of the first boss portion 104 is greater than the length of the second boss portion 106.

[0040] In one embodiment of this invention, along the length of the aluminum sheet 102, the length of the first boss portion 104 is greater than the length of the second boss portion 106. For example, when the length of the second boss portion 106 is 15 mm, the length of the first boss portion 104 is 20-25 mm. The two partially overlap in the length direction, and the non-overlapping section is a separate extension area of ​​the first boss portion 104. The overall layout is symmetrical about the center line of the aluminum sheet 102.

[0041] The longer length of the first protrusion 104 provides ample space for the installation of multiple terminals 108, meeting the electrode configuration requirements of different cells, while avoiding interference between the terminal 108 and the heat dissipation area of ​​the second protrusion 106. The longer first protrusion 104 can disperse the mechanical load transmitted by the terminal 108, reducing the deformation of the aluminum sheet 102 in the length direction. Combined with the supporting role of the second protrusion 106, it improves the overall bending resistance of the cover plate. The length difference creates a clear partition between the first protrusion 104 and the second protrusion 106, reducing mutual interference and ensuring that temperature changes during heat dissipation do not significantly affect the electrical performance of the terminal 108.

[0042] According to one embodiment of the present invention, along the length direction of the light aluminum sheet 102, a first mounting hole 112 for mounting the pole post 108 is provided on the segment of the first boss portion 104 that extends beyond the second boss portion 106.

[0043] In one embodiment of this utility model, the first boss portion 104 extends beyond the second boss portion 106 and has a segmented first mounting hole 112. The hole diameter is clearance-fitted with the diameter of the pole post 108, and the distance from the center of the hole to the edge of the aluminum sheet 102 is ≥3 mm. The number of mounting holes is determined according to the number of pole posts 108, and the hole walls can be polished to reduce contact resistance.

[0044] The terminal post 108 is installed in an independent segment of the first boss portion 104, away from the heat dissipation area of ​​the second boss portion 106. This reduces the impact of temperature fluctuations during water-cooled plate heat dissipation on the electrical connection of the terminal post 108 (such as changes in contact resistance due to thermal expansion and contraction), ensuring current stability during fast charging. The independent segmented mounting holes ensure that the assembly of the terminal post 108 with components such as the explosion-proof valve 120 and the water-cooled plate does not interfere with each other, allowing for separate positioning and fixing, reducing cumulative assembly errors and improving production efficiency. The first mounting hole 112 is located in an independent segment of the boss portion, and the thickness of the surrounding material is not weakened by other structures, which can better resist local stress during welding or use of the terminal post 108, reducing the risk of deformation.

[0045] According to one embodiment of the present invention, a second mounting hole 114 is provided at the position corresponding to the first mounting hole 112 in the lower plastic 100, and the pole post 108 is adapted to pass through the second mounting hole 114 and the first mounting hole 112 in sequence.

[0046] In one embodiment of this utility model, the second mounting hole 114 of the lower plastic 100 is a stepped hole, with the upper diameter larger than the first mounting hole 112 and the lower diameter interfering with the diameter of the electrode post 108. After the electrode post 108 passes through the lower and upper parts of the second mounting hole 114 in sequence, it is welded and fixed to the first mounting hole 112, and the connection is sealed by the stepped surface of the lower plastic 100.

[0047] The interference fit between the second mounting hole 114 and the terminal post 108 prevents electrolyte leakage through the gap. The stepped hole structure accommodates the welding redundancy of the terminal post 108, avoiding insulation failure and ensuring a stable electrochemical environment inside the cell, thus supporting electrolyte performance during fast charging. The coaxial design of the dual mounting holes guides the terminal post 108 to pass vertically through the aluminum sheet 102, reducing poor contact or localized wear caused by tilting, ensuring uniform current distribution during fast charging, and reducing localized overheating. The elastic properties of the lower plastic 100 buffer the assembly stress between the terminal post 108 and the aluminum sheet 102, preventing cracking at the edge of the first mounting hole 112 caused by rigid connection, and extending the service life of the cover plate.

[0048] According to one embodiment of the present invention, an upper plastic 116 and a riveting block 118 are installed on the segment of the pole post 108 that passes through the first mounting hole 112.

[0049] In one embodiment of this utility model, the portion of the pole post 108 that protrudes from the first mounting hole 112 is sequentially fitted with an upper plastic 116 and a riveting block 118: the upper plastic 116 is an insulating sleeve that wraps around the lower part of the exposed section of the pole post 108 and fits tightly against the top surface of the first protrusion 104; the riveting block 118 is a metal ring that is pressed onto the upper part of the exposed section of the pole post 108 and is fixed by deforming the end of the pole post 108 through a cold riveting process.

[0050] The mechanical fixing of the riveting block 118, combined with the insulating support of the upper plastic 116, prevents the terminal post 108 from loosening under vibration or thermal shock during fast charging, maintaining a stable electrical connection and reducing power loss caused by contact resistance fluctuations. The upper plastic 116 isolates the unnecessary conductive areas between the terminal post 108 and the aluminum sheet 102, avoiding the risk of short circuits and preventing external impurities from entering the mounting holes, ensuring the long-term reliability of the terminal post 108. The riveting structure can adapt to the installation requirements of different connecting pieces 110, and by changing the specifications of the riveting block 118, it is compatible with various fast charging interface designs, improving the versatility of the cell cover.

[0051] According to one embodiment of the present invention, a third mounting hole 122 for installing an explosion-proof valve 120 is provided on the second protrusion.

[0052] In one embodiment of this utility model, a third mounting hole 122 is formed in the central region of the second boss portion 106, and the diameter of the hole is larger than the sealing edge of the explosion-proof valve 120. The explosion-proof valve 120 is fixed to the stepped surface by laser welding.

[0053] The second protrusion 106 simultaneously supports the explosion-proof valve 120 and the water-cooling plate, ensuring that the heat dissipation path and the pressure relief path are independent yet closely coordinated. When fast charging causes a simultaneous increase in temperature and pressure, the water-cooling system controls the temperature, while the explosion-proof valve 120 promptly relieves pressure in case of overpressure, improving battery safety. The high thermal conductivity of the second protrusion 106 allows temperature changes inside the cell to be quickly transmitted to the explosion-proof valve 120, preventing pressure deviations caused by temperature lag and ensuring precise operation under preset conditions, protecting the cell from excessive pressure damage. Integrating the explosion-proof valve 120 into the second protrusion 106 reduces independent structures on the cover plate, reserving more space for the terminal post 108 and the water-cooling plate, resulting in a more compact overall design that meets the needs of high-energy-density cells.

[0054] According to one embodiment of the present invention, a protective patch 124 is provided on the side of the explosion-proof valve 120 away from the third mounting hole 122.

[0055] In one embodiment of this utility model, the protective patch 124 is a circular film, which can be made of heat-resistant polyimide material. Its edges are adhered to the top surface of the second protrusion 106 with high-temperature pressure-sensitive adhesive, completely covering the explosion-proof valve 120 but not in direct contact with it, and radial tear lines are printed on the surface of the patch.

[0056] The patch prevents dust, moisture, and other foreign objects from contacting the surface of the explosion-proof valve 120, avoiding contamination or corrosion of its sealing edges. This ensures that the explosion-proof valve 120 maintains accurate burst pressure characteristics even after long-term use, extending its effective service life. When the explosion-proof valve 120 actuates, the patch breaks before the valve itself, buffering the initial impact of the high-pressure airflow and reducing erosion damage to the edges of the valve 120. This ensures a smooth pressure relief process and prevents fragments from flying. The patch's breakage also provides a clear indication that the explosion-proof valve 120 has actuated, facilitating rapid identification of abnormal cell conditions, reducing troubleshooting time, and preventing foreign objects from entering the cell after pressure relief.

[0057] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is mounted.

[0058] According to the battery provided in the second aspect embodiment of this utility model, the rigid connection between the casing and the cell cover ensures the stable fit between the second protrusion 106 and the water-cooling plate, forming an efficient heat dissipation path. This allows the heat inside the cell to be quickly dissipated during fast charging, controlling the cell temperature within a safe range and preventing high temperatures from limiting fast charging power. Simultaneously, the stable support of the first protrusion 104 for the terminal post 108 ensures the reliability of high-current transmission, enabling the battery to withstand fast charging conditions for extended periods. The casing provides rigid support for the cell cover, reducing deformation of the double protrusions due to external impacts or internal pressure, indirectly enhancing the deformation resistance of the terminal post 108 and the explosion-proof valve 120. The corresponding design of the explosion-proof valve 120 and the casing pressure relief channel ensures timely pressure relief when the cell experiences pressure increases due to fast charging abnormalities, reducing the risk of thermal runaway. The presence of the protective patch 124 further extends the effective service life of the explosion-proof valve 120. Efficient heat dissipation reduces electrolyte decomposition and electrode aging during fast charging, while the stable connection of the 108 terminals prevents lithium dendrite growth caused by uneven current distribution. The combined effect of these two technologies allows the battery to maintain a high capacity retention rate even after long-term fast charging cycles. The sealed design of the casing and cover reduces the risk of electrolyte leakage, ensuring stable reactions within the cell.

[0059] The battery provided in the second aspect of this utility model integrates the aforementioned double-protrusion cell cover plate with the casing to form an energy storage device that combines efficient heat dissipation and stable fast charging performance.

[0060] 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, and a butyl rubber sealing gasket is set between the edge of the cover plate and the casing to ensure the liquid tightness and air tightness of the internal space.

[0061] 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. The first boss portion is used to install an electrode post, and the second boss portion is used to thermally couple with a water-cooling plate.

2. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the aluminum sheet, the thickness of the second boss portion is greater than the height of the pole post.

3. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the aluminum sheet, the thickness of the first boss portion is less than or equal to the sum of the height of the pole and the height of the connecting piece.

4. The cell cover plate according to claim 1, characterized in that, Along the length of the aluminum sheet, the length of the first boss portion is greater than the length of the second boss portion.

5. The cell cover plate according to claim 4, characterized in that, Along the length of the aluminum sheet, a first mounting hole for mounting the pole post is provided on the segment of the first boss portion that extends beyond the second boss portion.

6. The cell cover plate according to claim 5, characterized in that, The lower plastic part has a second mounting hole at the position corresponding to the first mounting hole, and the pole post is adapted to pass through the second mounting hole and the first mounting hole in sequence.

7. The cell cover plate according to claim 6, characterized in that, A plastic insert and a rivet block are installed on the segment where the pole protrudes from the first mounting hole.

8. The cell cover plate according to any one of claims 1 to 7, characterized in that, The second boss has a third mounting hole for installing an explosion-proof valve.

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

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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