Battery cell cover plate, shell and battery

Abstract

The utility model relates to a battery field provides a kind of electric core cover plate, shell and battery.Electric core cover plate includes lower plastic;Aluminum sheet, the first side of aluminum sheet is installed in lower plastic, and the second side of aluminum sheet is formed with the boss portion that protrudes towards the direction away from lower plastic;Heat conduction piece, it is installed in the side of boss portion away from lower plastic, and heat conduction piece is used to be connected with the heat coupling of connecting piece and water cooling plate, wherein, connecting piece is electrically connected with pole column.This electric core cover plate shortens heat transfer path, compared with traditional indirect cooling structure, reduces the transmission resistance of heat between aluminum sheet and water cooling plate, solves the problem of heat dissipation lag in pole column area in traditional structure, and pole column temperature reduction is more significant, prolongs the service life of pole column periphery sealing element.

Description

Technical Field

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

[0002] In existing technologies, there are many challenges and shortcomings in cooling and heat dissipation technologies for battery cells, especially in the design of cooling systems for battery modules or entire battery packs. Currently, the industry commonly uses indirect cooling via a whole-pack approach, employing water-cooled plates to provide cooling for the cells. However, this method has a significant problem: the water-cooled plate and the cell structure are not perfectly aligned, especially in the cover area, making it difficult to achieve optimal cooling. Therefore, existing cooling technologies cannot effectively improve the cooling efficiency of the cells during operation, particularly under high loads, where heat is difficult to dissipate effectively, accelerating cell degradation and aging.

[0003] To complicate matters further, temperature management in the cell's terminal area is currently a challenge. Traditional cooling methods struggle to achieve precise control over temperature-sensitive areas within the cell, particularly around the terminals. Whole-pack water cooling technology also fails to achieve sufficient contact and heat exchange near the terminals, impacting not only the cell's lifespan but also increasing the overall complexity of thermal management for the power supply system.

[0004] Finally, the technological challenge of controlling the height of the cell bump needs attention. In battery production, ensuring that the height of the cell bump is roughly the same as the height of the connecting piece is a significant technical hurdle. Current manufacturing processes lack sufficient support for this, failing to guarantee the stability and consistency of the bump height. This has become a major bottleneck in battery manufacturing, impacting the overall performance and reliability of the battery. Utility Model Content

[0005] This utility model provides a battery cell cover plate to solve the defect of limited cooling effect of water-cooled plates on battery cells in related technologies.

[0006] This utility model embodiment also provides a housing.

[0007] This utility model embodiment also provides a battery.

[0008] 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 boss portion protruding in a direction away from the lower plastic; A heat-conducting component is installed on the side of the boss portion away from the lower plastic part. The heat-conducting component is used for thermal coupling connection with the connecting piece and the water-cooling plate, wherein the connecting piece is electrically connected to the electrode post.

[0009] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the plane where the top surface of the heat-conducting element is located is coplanar with the plane where the top surface of the connecting piece is located.

[0010] According to one embodiment of the present invention, along the length direction of the aluminum sheet, the length of the boss portion is less than the length of the aluminum sheet.

[0011] According to one embodiment of the present invention, along the length direction of the aluminum sheet, first mounting holes for mounting the pole post are provided on the segments of the aluminum sheet extending beyond the boss portion on both sides.

[0012] According to one embodiment of the present invention, a second mounting hole is provided on the lower plastic at a 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 and be connected to the connecting piece.

[0013] According to one embodiment of the present invention, along the length direction of the aluminum sheet, an upper plastic is provided on the aluminum sheet at a position corresponding to the first mounting hole, and a rivet block is embedded in the upper plastic, and the end of the pole is connected to the rivet block.

[0014] According to one embodiment of the present invention, the two first mounting holes are symmetrically arranged with respect to the center line of the width direction of the aluminum sheet.

[0015] According to one embodiment of the present invention, along the length direction of the aluminum sheet, the length of the heat-conducting element is less than or equal to the length of the boss portion.

[0016] A second aspect of this utility model provides a housing, including the cell cover plate as described above.

[0017] A third aspect of this utility model provides a battery, including the cell cover plate as described above; or, As described above, this is the casing.

[0018] According to the first aspect of the present invention, the cell cover plate directly connects the heat-conducting component to the boss and the water-cooling plate, shortening the heat transfer path and reducing the heat transfer resistance between the aluminum sheet and the water-cooling plate compared to the traditional indirect cooling structure. The direct contact between the connecting piece and the heat-conducting component allows the heat from the electrode to bypass the aluminum sheet and be directly transferred to the water-cooling plate, solving the problem of delayed heat dissipation in the electrode area in the traditional structure. This results in a more significant reduction in electrode temperature and extends the service life of the sealing components around the electrode. It also prevents localized heat accumulation, effectively controlling the cell temperature during high-load operation. The rigid connection between the heat-conducting component and the boss resists thermal expansion and contraction during charge-discharge cycles, preventing loosening. Furthermore, the heat-conducting component can compensate for assembly errors, ensuring a long-term tight fit between the water-cooling plate and the boss, maintaining a stable cooling effect.

[0019] According to the second aspect of the present invention, the rigid connection between the outer shell and the cell cover enhances the protection of the internal cell, resisting external impacts and vibrations and reducing the risk of deformation of the boss and heat-conducting components. The cooperation between the sealing gasket and the insulating layer prevents electrolyte leakage from corroding the heat-conducting components and avoids short circuits between the shell and the aluminum sheet, ensuring safe battery operation. The shell's fixing effect on the cell cover reduces component displacement caused by thermal expansion and contraction during charge and discharge cycles, maintains close contact between the heat-conducting components and the water-cooling plate, ensures that insulation and sealing performance are maintained even after long-term use, and extends the overall battery life.

[0020] According to the battery provided in the third aspect embodiment of this utility model, the thermal coupling design of the heat-conducting component of the cell cover with the connecting piece and the water-cooling plate allows for rapid heat dissipation from the cell body and the terminal area. Combined with the auxiliary heat dissipation of the casing, this effectively reduces the battery's operating temperature. During high-load charging and discharging, the overall battery temperature is more uniform, avoiding performance degradation caused by localized overheating, and particularly improving the heat dissipation effect in the high-temperature sensitive area of ​​the terminals. The rigid connection between the cell cover and the casing provides stable support for the cell body, reducing electrode displacement caused by vibration or thermal expansion and contraction during charging and discharging cycles. The tight connection between the heat-conducting component and the boss resists structural deformation, ensuring a long-term unobstructed heat dissipation path. At the same time, the fixed structure of the terminals prevents loose electrical connections and ensures stable current transmission. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0023] Figure 2 This is a schematic exploded view of the battery cell cover plate provided by this utility model.

[0024] Figure 3 This is a schematic side view of the battery cell cover plate provided by this utility model.

[0025] Figure label: 100. Lower plastic part; 102. Plain aluminum sheet; 104. Boss part; 106. Heat-conducting component; 108. Connecting piece; 110. Pole post; 112. First mounting hole; 114. Second mounting hole; 116. Upper plastic part; 118. Riveting block. Detailed Implementation

[0026] 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.

[0027] like Figures 1 to 3 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 boss portion 104 protruding in a direction away from the lower plastic 100. The heat-conducting component 106 is installed on the side of the boss portion 104 away from the lower plastic 100. The heat-conducting component 106 is used for thermal coupling connection with the connecting piece 108 and the water-cooling plate. The connecting piece 108 is electrically connected to the pole post 110.

[0028] According to the battery cell cover provided in the first aspect embodiment of this utility model, the heat-conducting element 106 directly connects the boss portion 104 and the water-cooling plate, shortening the heat transfer path. Compared with the traditional indirect cooling structure, this reduces the heat transfer resistance between the aluminum sheet 102 and the water-cooling plate. The direct contact between the connecting piece 108 and the heat-conducting element 106 allows the heat of the electrode post 110 to bypass the aluminum sheet 102 and be directly transferred to the water-cooling plate, solving the problem of delayed heat dissipation in the electrode post 110 area in the traditional structure. The temperature of the electrode post 110 is reduced more significantly, extending the service life of the sealing components around the electrode post 110. This avoids local heat accumulation and effectively controls the temperature of the battery cell during high-load operation. The rigid connection between the heat-conducting element 106 and the boss portion 104 resists thermal expansion and contraction during charge and discharge cycles, preventing loosening of the contact. In addition, the heat-conducting element 106 can also compensate for assembly errors, ensuring that the water-cooling plate and the boss portion 104 are in close contact for a long time, maintaining a stable cooling effect.

[0029] Please continue reading Figures 1 to 3The battery cell cover provided in the first aspect of this utility model constructs an efficient heat conduction path between the battery cell and the water-cooled plate through the collaborative design of the boss portion 104 and the heat-conducting component 106.

[0030] The lower plastic 100 can be made of insulating and high-temperature resistant material, and is injection molded to cover the first side of the light aluminum sheet 102, with only the protrusion 104 area exposed, so as to achieve electrical isolation between the inside and outside of the battery cell, and at the same time provide structural support for the light aluminum sheet 102.

[0031] The aluminum sheet 102 can be made of a high thermal conductivity aluminum alloy. The first side is tightly attached to the lower plastic 100, and the second side is stamped to form a boss 104. The boss 104 extends along the length of the aluminum sheet 102 to ensure tight contact with the heat-conducting component 106.

[0032] The heat-conducting component 106 can be a heat-conducting patch with a certain thickness. The heat-conducting patch can be fixed to the top surface of the boss 104 with heat-conducting adhesive to ensure efficient heat transfer.

[0033] The heat generated by the battery cell during operation is transferred through the following two paths to form a dual-channel heat dissipation system: Internal heat of the battery cell → aluminum sheet 102 → boss 104 → heat-conducting component 106 → water-cooling plate; Heat from pole 110 area → connecting piece 108 → heat conductor 106 → water cooling plate.

[0034] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet 102, the plane on which the top surface of the heat-conducting element 106 is located is coplanar with the plane on which the top surface of the connecting piece 108 is located.

[0035] In one embodiment of this utility model, along the thickness direction of the aluminum sheet 102, the height difference between the top surface of the heat-conducting component 106 and the top surface of the connecting piece 108 is controlled within a preset range to form a coplanar structure.

[0036] The coplanar design allows the water-cooled plate to fit snugly against both the heat-conducting component 106 and the connecting piece 108, avoiding local gaps caused by height differences, increasing the effective heat dissipation area, and ensuring that heat from both the battery cell body and the terminal post 110 area can be efficiently dissipated through the water-cooled plate. There is no need to adjust the shape of the water-cooled plate to avoid the connecting piece 108, reducing the design complexity of the water-cooled plate and the alignment difficulty during assembly, thus improving production efficiency. The coplanar contact ensures uniform pressure distribution between the water-cooled plate and the heat-conducting component 106 and the connecting piece 108, preventing component deformation caused by excessive localized stress and maintaining long-term heat dissipation stability.

[0037] According to one embodiment of the present invention, along the length direction of the aluminum sheet 102, the length of the boss portion 104 is less than the length of the aluminum sheet 102.

[0038] In one embodiment of this utility model, the length of the boss portion 104 is shorter than that of the aluminum sheet 102 along its length direction. For example, when the length of the aluminum sheet 102 is 50 mm, the length of the boss portion 104 is 40-45 mm.

[0039] The portion of the aluminum sheet 102 extending beyond the boss 104 provides mounting positions for components such as the electrode post 110 and the upper plastic 116, avoiding structural interference between the boss 104 and the electrode post 110, and achieving a separate layout for heat dissipation and conductivity. The edge area of ​​the aluminum sheet 102 extending beyond the boss 104 has not undergone stamping deformation, resulting in better material integrity and improving the overall bending resistance of the cover, reducing the risk of deformation during assembly. The shortened length of the boss 104 concentrates heat transfer in the central area of ​​the cell, avoiding excessive heat dissipation at the edges and resulting in excessive internal temperature differences within the cell, thus balancing the cooling effect.

[0040] According to one embodiment of the present invention, along the length direction of the aluminum sheet 102, first mounting holes 112 for mounting pole posts 110 are provided on the segments of the aluminum sheet 102 that extend beyond the boss portion 104.

[0041] In one embodiment of the present invention, the aluminum sheet 102 extends beyond the boss portion 104 and is provided with a first mounting hole 112 on each side.

[0042] The electrode post 110 is mounted on the outside of the boss portion 104 to avoid direct contact with the heat-conducting component 106, reducing the interference of Joule heat generated by the current in the electrode post 110 on the heat dissipation path and ensuring that the heat transferred by the heat-conducting component 106 mainly comes from inside the battery cell. The first mounting hole 112 is located in the undeformed edge area of ​​the aluminum sheet 102, with higher material strength, which can withstand the riveting or welding force during the assembly of the electrode post 110, reducing the risk of hole wall cracking. The symmetrical first mounting holes 112 on both sides make the current conduction from the electrode post 110 to the connecting piece 108 more uniform, avoiding the aggravation of heat generation caused by local current concentration, and indirectly reducing the heat dissipation burden.

[0043] According to one embodiment of the present invention, a second mounting hole 114 is provided on the lower plastic 100 at a position corresponding to the first mounting hole 112, and the pole post 110 is adapted to pass through the second mounting hole 114 and the first mounting hole 112 in sequence and be connected to the connecting piece 108.

[0044] In one embodiment of this utility model, the second mounting hole 114 of the lower plastic 100 is a stepped hole. After the pole post 110 passes through the second mounting hole 114 and the first mounting hole 112 in sequence, its top end is laser welded to the connecting piece 108 for fixation.

[0045] The interference fit between the two mounting holes and the terminal post 110 prevents electrolyte leakage through the mounting gap. The stepped hole structure avoids rigid friction between the terminal post 110 and the lower plastic 100, protecting insulation performance and ensuring a stable electrochemical environment inside the cell. The coaxial design of the dual mounting holes guides the terminal post 110 to be installed vertically, reducing poor contact of the connecting piece 108 due to tilting, and lowering local resistance and heat generation. The elastic properties of the lower plastic 100 buffer the assembly stress between the terminal post 110 and the aluminum sheet 102, preventing cracks from forming at the edge of the first mounting hole 112 due to stress concentration, and extending the service life of the cover plate.

[0046] According to one embodiment of the present invention, along the length direction of the light aluminum sheet 102, an upper plastic 116 is provided on the light aluminum sheet 102 at a position corresponding to the first mounting hole 112, and a rivet block 118 is embedded in the upper plastic 116, and the end of the pole post 110 is connected to the rivet block 118.

[0047] In one embodiment of this utility model, the upper plastic 116 has a ring structure and is sleeved on the part of the pole post 110 that protrudes from the first mounting hole 112. The bottom is bonded and fixed to the top surface of the aluminum sheet 102 with a high-temperature resistant insulating material. The riveting block 118 is made of copper alloy and is embedded in the central hole of the upper plastic 116. It is connected to the top of the pole post 110 by a cold riveting process, and the top surface of the riveting block 118 contacts the connecting piece 108.

[0048] The mechanical fixing of the riveting block 118 to the electrode post 110, coupled with the support of the plastic 116, enhances the pull-out resistance of the electrode post 110, preventing it from loosening under charging / discharging vibrations or thermal shocks, thus maintaining a stable electrical connection and heat dissipation path. The plastic 116 isolates the non-conductive areas of the electrode post 110 and the aluminum sheet 102, avoiding short-circuit risks and preventing dust, moisture, and other impurities from entering the mounting holes, protecting the contact interface between the electrode post 110 and the aluminum sheet 102. The elastic deformation of the plastic 116 compensates for displacement caused by the difference in thermal expansion coefficients between the electrode post 110 and the aluminum sheet 102, reducing the stress deformation of the connecting piece 108 and ensuring good contact between it and the heat-conducting component 106.

[0049] According to one embodiment of the present invention, two first mounting holes 112 are symmetrically arranged around the center line of the width direction of the aluminum sheet 102.

[0050] In one embodiment of this utility model, two first mounting holes 112 are symmetrically distributed about the centerline of the aluminum sheet 102 in the width direction, and the distance from the center of the two first mounting holes 112 to the centerline is equal. The two first mounting holes 112 have the same diameter, ensuring the insulation distance between the pole post 110 and the housing.

[0051] The symmetrically arranged terminals 110 ensure even current output from both sides of the cell, preventing localized heat concentration caused by excessive current on one side and reducing the heat dissipation burden on the heat-conducting component 106. The symmetrical distribution of the terminals 110 also ensures more even stress on the connecting piece 108, preventing warping due to unilateral stress and ensuring coplanarity and effective heat dissipation contact with the heat-conducting component 106. The symmetrical structure facilitates bidirectional alignment and installation of the cell cover and battery casing, reducing the risk of assembly errors and improving production efficiency.

[0052] According to one embodiment of the present invention, along the length direction of the aluminum sheet 102, the length of the heat-conducting element 106 is less than or equal to the length of the boss portion 104.

[0053] In one embodiment of this utility model, the length of the heat-conducting element 106 is shorter than that of the boss portion 104 along the length direction of the aluminum sheet 102. For example, when the length of the boss portion 104 is 40 mm, the length of the heat-conducting element 106 is 38-40 mm, with both ends recessed by 0-1 mm.

[0054] The length of the heat-conducting component 106 does not exceed that of the boss portion 104, avoiding installation interference caused by both ends extending beyond the edge of the boss portion 104, ensuring a complete fit with the boss portion 104, and reducing contact thermal resistance. The recessed design prevents the edge of the heat-conducting component 106 from contacting the non-boob area of ​​the aluminum sheet 102, avoiding localized deformation of the aluminum sheet 102 due to the protrusion of the heat-conducting component 106, and maintaining the overall flatness of the cover plate. The length of the heat-conducting component 106 matches the boss portion 104, allowing for precise correspondence with the heat dissipation area of ​​the water-cooling plate, preventing heat transfer to non-working areas of the water-cooling plate, and improving heat dissipation efficiency.

[0055] A second aspect of this utility model provides a housing, including the cell cover plate as described above.

[0056] According to the second aspect of the present invention, the rigid connection between the outer shell and the cell cover enhances the protection of the internal cell, resisting external impacts and vibrations, and reducing the risk of deformation of the boss 104 and the heat-conducting component 106. The cooperation between the sealing gasket and the insulating layer prevents electrolyte leakage from corroding the heat-conducting component 106 and avoids short circuits between the shell and the aluminum sheet 102, ensuring safe battery operation. The fixing effect of the shell on the cell cover reduces component displacement caused by thermal expansion and contraction during charge and discharge cycles, maintains close contact between the heat-conducting component 106 and the water-cooling plate, ensures that insulation and sealing performance are maintained even after long-term use, and extends the overall life of the battery.

[0057] The housing provided in the second aspect of this utility model forms a closed structure by integrating the above-mentioned cell cover plate, providing protection and functional compatibility for the cell.

[0058] The shell is a hollow cavity with one open end, made of aluminum alloy or high-strength engineering plastic, with an insulating layer on the inner wall to prevent direct conductivity with the battery cell; the battery cell cover is installed on the open end of the shell body by laser welding or bolt fastening, and a sealing gasket is set between the edge of the battery cell cover and the shell to ensure the liquid and air tightness of the shell and prevent electrolyte leakage and external moisture intrusion.

[0059] A third aspect of this utility model provides a battery, including the cell cover plate as described above; or, As described above, this is the casing.

[0060] According to the battery provided in the third aspect embodiment of this utility model, the thermal coupling design of the heat-conducting component 106 of the cell cover plate with the connecting piece 108 and the water-cooling plate allows for rapid heat dissipation from the cell body and the terminal post 110 area. Combined with the auxiliary heat dissipation of the casing, this effectively reduces the battery's operating temperature. During high-load charging and discharging, the overall battery temperature is more uniform, avoiding performance degradation caused by local overheating, and particularly improving the heat dissipation effect of the high-temperature sensitive area, the terminal post 110. The rigid connection between the cell cover plate and the casing provides stable support for the cell body, reducing electrode displacement caused by vibration or thermal expansion and contraction during charging and discharging cycles. The tight connection between the heat-conducting component 106 and the boss portion 104 resists structural deformation, ensuring a long-term unobstructed heat dissipation path. At the same time, the fixed structure of the terminal post 110 prevents loose electrical connections and ensures stable current transmission.

[0061] The battery provided in the third aspect of this utility model forms a complete electrochemical energy storage device by integrating the aforementioned cell cover plate or a housing containing the cell cover plate.

[0062] The battery includes a cell body, an electrolyte, and a cell cover or a housing containing the cell cover. The cell body is a wound or stacked electrode assembly, immersed in the electrolyte, and electrically connected to the cell cover via tabs and connecting pieces 108. The cell body is fixed inside the housing by an insulating bracket, and the housing and the cell cover form a closed space to prevent electrolyte leakage and protect the internal components.

[0063] 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 boss portion protruding in a direction away from the lower plastic; A heat-conducting component is installed on the side of the boss portion away from the lower plastic part. The heat-conducting component is used for thermal coupling connection with the connecting piece and the water-cooling plate, wherein the connecting piece is electrically connected to the electrode post.

2. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the aluminum sheet, the plane on which the top surface of the heat-conducting component is located is coplanar with the plane on which the top surface of the connecting piece is located.

3. The cell cover plate according to claim 1, characterized in that, Along the length of the aluminum sheet, the length of the boss portion is less than the length of the aluminum sheet.

4. The cell cover plate according to claim 3, characterized in that, Along the length of the aluminum sheet, first mounting holes for mounting the pole are provided on the segments of the aluminum sheet that extend beyond the boss portion on both sides.

5. The cell cover plate according to claim 4, characterized in that, A second mounting hole is provided on the lower plastic part at a position corresponding to the first mounting hole. The pole post is adapted to pass through the second mounting hole and the first mounting hole in sequence and connect with the connecting piece.

6. The cell cover plate according to claim 4, characterized in that, Along the length of the aluminum sheet, an upper plastic is provided on the aluminum sheet at a position corresponding to the first mounting hole. A rivet block is embedded in the upper plastic, and the end of the pole is connected to the rivet block.

7. The cell cover plate according to claim 4, characterized in that, The two first mounting holes are symmetrically arranged with respect to the center line of the width direction of the aluminum sheet.

8. The cell cover plate according to any one of claims 1 to 7, characterized in that, Along the length of the aluminum sheet, the length of the heat-conducting element is less than or equal to the length of the boss portion.

9. A housing, characterized in that, Includes the cell cover plate as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the cell cover plate as described in any one of claims 1 to 8; or, The housing as described in claim 9.

Images