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, the second side of aluminum sheet is formed with the boss structure that protrudes towards the direction away from lower plastic;Upper plastic, install in aluminum sheet, along the length direction of aluminum sheet, upper plastic is located at the two sides of boss structure, and stop portion for increasing creeping distance is formed on upper plastic.The electric core cover plate compared with the upper plastic of traditional no stop portion, creeping distance is promoted, effectively reduce the risk of arc breakdown under high voltage, especially suitable for high-voltage electric core.Upper plastic is located at the design of the two sides of boss structure, while strengthening insulation does not occupy the functional area of boss structure, ensure that the heat dissipation or electric conduction function of boss structure is not affected, realize the compatibility of insulation and functionality.

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] With the increasing demand for fast charging, fast charging technology is becoming increasingly important. Fast charging causes a rapid rise in temperature of protruding structures such as terminals and connecting tabs on the cell cover. Traditional cooling methods struggle to directly address these protruding structures, affecting battery cooling efficiency and potentially causing short circuits between the welded external connecting tabs and the cover protrusions. This is especially true for protrusions formed from aluminum sheets, which are often very close to the riveting blocks. Welding external connecting tabs often results in these tabs being very close to the cover protrusions, leading to a potential short circuit risk.

[0003] Therefore, the current technical challenge facing the industry lies in how to effectively handle the protruding structure on the cell cover, so as to achieve cooling of the cell cover, avoid additional load on the terminal post, and ensure the electrical safety inside the battery pack to prevent short circuits caused by insufficient creepage distance. Utility Model Content

[0004] This utility model provides a cell cover plate to solve the defect in related technologies where cell cover plates cannot avoid the risk of short circuits.

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

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

[0007] 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 structure protruding in a direction away from the lower plastic; An upper plastic is installed on the light aluminum sheet along the length of the light aluminum sheet. The upper plastic is located on both sides of the boss structure, and a stop portion for increasing the creepage distance is formed on the upper plastic.

[0008] According to one embodiment of the present invention, the stop portion is formed on the side of the upper plastic facing the boss structure.

[0009] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the height of the stop portion is greater than the height of the boss structure.

[0010] According to one embodiment of the present invention, it further includes an electrode post and a connecting piece. When the connecting piece is connected to the electrode post, the plane where the top surface of the stop portion is located is coplanar with the plane where the top surface of the connecting piece is located along the thickness direction of the aluminum sheet.

[0011] According to one embodiment of the present invention, along the width direction of the aluminum sheet, the width W1 of the stop portion is greater than the width W2 of the upper plastic.

[0012] According to one embodiment of the present invention, along the width direction of the aluminum sheet, the width W1 of the stop portion, the width W3 of the boss structure and the width W4 of the aluminum sheet satisfy W3≤W1≤W4.

[0013] According to one embodiment of the present invention, the stop portion is integrally formed with the upper plastic.

[0014] According to one embodiment of the present invention, along the length direction of the aluminum sheet, the length of the aluminum sheet is greater than the length of the boss structure, and mounting holes for mounting the upper plastic are provided on the segments of the aluminum sheet that extend beyond the boss structure.

[0015] A second aspect of this utility model provides a housing, including the cell cover plate as described above.

[0016] 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.

[0017] According to the first aspect of the present invention, the cell cover plate has a stop portion that extends the surface distance between the electrode post and the aluminum sheet. Compared with the traditional upper plastic without a stop portion, the creepage distance is improved, effectively reducing the risk of arc breakdown under high voltage, which is especially suitable for high-voltage cells. The stop portion can prevent electrolyte droplets, dust, and other impurities from forming a conductive path between the electrode post and the aluminum sheet, and can also guide condensate to drip down the surface, avoiding the decrease in insulation performance caused by liquid accumulation and extending the insulation life of the cell cover plate. The design of the upper plastic on both sides of the boss structure strengthens the insulation without occupying the functional area of ​​the boss structure (such as the electrode post mounting position), ensuring that the heat dissipation or conductivity of the boss structure is not affected, and achieving compatibility between insulation and functionality. The multi-point fixing of the upper plastic and the aluminum sheet combined with the rigid support of the stop portion can resist the thermal expansion and contraction stress during the charging and discharging cycle of the cell, avoid the creepage distance change caused by the displacement of the upper plastic, and maintain the long-term stability of the insulation performance.

[0018] According to the second aspect of the present invention, the housing and the stop portion of the cell cover plate work together to form multi-level insulation protection: the insulating coating of the outer shell body blocks the external conductive path, and the stop portion extends the internal creepage distance. The combination of the two effectively reduces the risk of short circuit of the battery under high voltage, which is especially suitable for high-voltage cell modules. The outer shell body provides rigid support for the cell cover plate, reducing the impact of external impact or vibration on the boss structure and the stop portion, and avoiding changes in creepage distance due to deformation; the cooperation between the sealing gasket and the insulating partition prevents the electrolyte from corroding the housing and avoids electrochemical corrosion between the housing and the aluminum sheet, thus extending the equipment life.

[0019] According to the battery provided in the third aspect embodiment of this utility model, the stop portion of the cell cover and the insulation design of the casing work together to effectively extend the creepage distance and reduce the risk of arc breakdown under high voltage. Especially when fast charging causes the temperature of the terminal post to rise, it can avoid short circuits caused by insulation failure between the connecting piece and the aluminum sheet, ensuring battery safety. The layout of the stop portion does not occupy the functional areas of the boss structure and the terminal post, ensuring smooth current transmission path; the clearance design of the casing provides space for heat dissipation components, allowing the heat of the battery to dissipate in time during fast charging, avoiding the impact of high temperature on insulation performance, and achieving compatibility between safety and fast charging. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0022] Figure 2 This is a schematic exploded view of the battery cell cover plate provided by this utility model.

[0023] Figure 3 This is a schematic side view of the battery cell cover plate provided by this utility model.

[0024] Figure 4 This is a schematic top view of the battery cell cover plate provided by this utility model.

[0025] Figure 5 This is a schematic perspective view of the plastic coating provided by this utility model. Figure label: 100. Lower plastic; 102. Plain aluminum sheet; 104. Boss structure; 106. Upper plastic; 108. Stop part; 110. Mounting hole; 112. Terminal post. 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 5 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 structure 104 that protrudes in a direction away from the lower plastic 100. The upper plastic 106 is installed on the light aluminum sheet 102. Along the length of the light aluminum sheet 102, the upper plastic 106 is located on both sides of the boss structure 104. The upper plastic 106 has a stop portion 108 for increasing the creepage distance.

[0028] According to the first aspect of the present invention, the cell cover plate provided with the stop portion 108 extends the surface distance between the electrode post 112 and the aluminum sheet 102. Compared with the traditional upper plastic 106 without the stop portion 108, the creepage distance is improved, effectively reducing the risk of arc breakdown under high voltage, which is especially suitable for high-voltage cells. The stop portion 108 can prevent electrolyte droplets, dust and other impurities from forming a conductive path between the electrode post 112 and the aluminum sheet 102, and can also guide condensate to drip down the surface, avoiding the decrease in insulation performance caused by liquid accumulation and extending the insulation life of the cell cover plate. The design of the upper plastic 106 located on both sides of the boss structure 104 strengthens the insulation without occupying the functional area of ​​the boss structure 104 (such as the electrode post 112 mounting position), ensuring that the heat dissipation or conductivity of the boss structure 104 is not affected, and achieving compatibility between insulation and functionality. The rigid support of the multi-point fixing and stop part 108 of the upper plastic 106 and the light aluminum sheet 102 can resist the thermal expansion and contraction stress in the charging and discharging cycle of the battery cell, avoid the creepage distance change caused by the displacement of the upper plastic 106, and maintain the long-term stability of the insulation performance.

[0029] Please continue reading Figures 1 to 5 The battery cell cover provided in the first aspect of this utility model optimizes the insulation performance through the design of the stop portion 108 of the upper plastic 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, providing support for the light aluminum sheet 102 and achieving electrical isolation inside the battery cell.

[0031] The aluminum sheet 102 can be made of high-purity aluminum alloy. Its first side is tightly fitted with the lower plastic 100, and its second side is stamped to form a boss structure 104. The boss structure 104 extends along the width of the aluminum sheet 102 for mounting the pole post 112 or a heat-conducting component.

[0032] The upper plastic part 106 is an insulating plastic component, which is fixed to the second side of the aluminum sheet 102 by means of clips or adhesives. It is distributed on both sides of the boss structure 104 along the length direction and forms a certain distance from the edge of the boss structure 104. The top of the upper plastic part 106 forms a stop part 108, which extends away from the boss structure 104 and may have an L-shaped cross-section.

[0033] A stepped gap can be formed between the stop portion 108 and the boss structure 104. After the pole post 112 passes through the aluminum sheet 102, the shortest path between the exposed part of the pole post 112 and the stop portion 108 of the upper plastic 106 is much greater than the distance of the traditional planar structure. This can avoid contact interference between the pole post 112 and the boss structure 104 and prevent the occurrence of short circuit.

[0034] According to one embodiment of the present invention, a stop portion 108 is formed on the side of the upper plastic 106 facing the boss structure 104.

[0035] In one embodiment of this utility model, the stop portion 108 is integrally formed on the side of the upper plastic 106 facing the boss structure 104. Its cross-section can be rectangular, and a preset distance is formed between it and the edge of the boss structure 104. The root of the stop portion 108 is connected to the main body of the upper plastic 106 through an arc transition, and the surface is smooth without sharp edges to avoid stress concentration. After the upper plastic 106 is fixed to the aluminum sheet 102 by a snap fastener, the stop portion 108 is located exactly at the gap between the boss structure 104 and the upper plastic 106, forming a physical barrier.

[0036] The stop portion 108 is positioned towards the boss structure 104, directly blocking the surface leakage path between the electrode post 112 and the aluminum sheet 102. Compared to a structure with the stop portion facing away from the boss, this arrangement more efficiently extends the creepage distance and reduces the risk of short circuits. This layout creates an inclined flow-guiding surface on the inner side of the stop portion 108, allowing electrolyte droplets or condensate to flow along the surface to the edge of the aluminum sheet 102, preventing the accumulation of conductive media around the boss structure 104 and maintaining stable insulation performance. The stop portion 108 does not occupy the top space of the boss structure 104, ensuring that the installation and heat conduction functions of the electrode post 112 are not affected, achieving a synergy between insulation enhancement and functionality.

[0037] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet 102, the height of the stop portion 108 is greater than the height of the boss structure 104.

[0038] In one embodiment of this invention, the height of the stop portion 108 is higher than that of the boss structure 104 along the thickness direction of the aluminum sheet 102. For example, when the height of the boss structure 104 is 3mm, the height of the stop portion 108 is 3.5-4mm.

[0039] The stop portion 108 is higher than the boss structure 104, which can spatially prevent accidental contact between external conductive components (such as connecting pieces) and the boss structure 104. Especially during welding or assembly, it can effectively avoid short circuits caused by metal debris and improve operational safety. The higher stop portion 108 makes the electric field strength around the electrode post 112 more uniform, reduces the local electric field concentration caused by the protrusion of the boss structure 104, and reduces the risk of breakdown under high voltage, making it suitable for high-voltage battery cell scenarios.

[0040] According to one embodiment of the present invention, it further includes an electrode post and a connecting piece. When the connecting piece is connected to the electrode post, the plane where the top surface of the stop portion 108 is located along the thickness direction of the aluminum sheet 102 is coplanar with the plane where the top surface of the connecting piece is located.

[0041] In one embodiment of this utility model, the top surface of the stop portion 108 and the top surface of the connecting piece form a coplanar structure. After the connecting piece is welded to the top of the pole post 112, its top surface and the top surface of the stop portion 108 are calibrated by laser ranging to ensure that there are no obvious steps after assembly.

[0042] The coplanar design allows external components such as the water-cooling plate to simultaneously adhere to the connecting piece and the stop portion 108, avoiding poor local contact caused by height differences. This ensures heat dissipation efficiency without compromising the insulation function of the stop portion 108. The smooth transition between the connecting piece and the stop portion 108 disperses the impact of external pressure on the pole post 112, preventing loosening or breakage of the pole post 112 due to excessive local stress, thus extending the component's lifespan.

[0043] According to one embodiment of the present invention, along the width direction of the aluminum sheet 102, the width W1 of the stop portion 108 is greater than the width W2 of the upper plastic 106.

[0044] In one embodiment of this utility model, along the width direction of the aluminum sheet 102, the width W1 of the stop portion 108 is larger than the width W2 of the upper plastic body 106 (e.g., when W2=5mm, W1=6-7mm).

[0045] The increased width of the stop portion 108 covers more potential leakage paths, effectively isolating the conductive areas at the edge of the aluminum sheet 102, further reducing the risk of side short circuits compared to a design with equal width. The increased width of the stop portion 108 also improves the overall bending resistance of the upper plastic 106, reducing warping caused by thermal expansion and contraction and maintaining a stable creepage distance.

[0046] According to one embodiment of the present invention, along the width direction of the aluminum sheet 102, the width W1 of the stop portion 108, the width W3 of the boss structure 104 and the width W4 of the aluminum sheet 102 satisfy W3≤W1≤W4.

[0047] In one embodiment of this utility model, the width parameters are designed according to the following relationship: for example, the width W3 of the boss structure 104 is 10-15mm, the width W1 of the stop portion 108 is 10-20mm, and the width W4 of the aluminum sheet 102 is 20-30mm. For instance, when W3=12mm, W1=12-20mm, and W4=25mm. Each width is ensured by mold positioning with a deviation ≤0.2mm, ensuring that the stop portion 108 completely covers the width range of the boss structure 104 and does not exceed the edge of the aluminum sheet 102.

[0048] The width W1 of the stop portion 108 is greater than or equal to the width W3 of the boss structure 104, ensuring that the stop portion 108 completely covers the boss structure 104 in the width direction, avoiding blind spots in side insulation caused by an excessively wide boss. The width of the aluminum sheet 102 is greater than or equal to W1 of the stop portion 108, preventing assembly interference caused by the stop portion 108 exceeding the aluminum sheet 102, thus balancing insulation protection and structural compatibility. The parameter relationships clearly define the dimensional constraints of each component, facilitating mold design and quality control during mass production, and reducing fluctuations in insulation performance caused by dimensional deviations.

[0049] According to one embodiment of the present invention, the stop portion 108 is integrally formed with the upper plastic 106.

[0050] In one embodiment of this utility model, the stop portion 108 and the upper plastic 106 are integrally molded using an injection molding process, and the material is a high-temperature resistant insulating plastic. The bonding strength between the stop portion 108 and the upper plastic 106 ensures that no breakage will occur under vibration or temperature cycling.

[0051] The one-piece molding eliminates the connection gap between the stop 108 and the upper plastic 106, preventing impurities from entering through the gap and forming a conductive path. Compared with the assembled structure, the insulation performance is more stable, making it especially suitable for humid or dusty environments. One-piece molding reduces assembly steps, lowers the risk of dimensional deviations caused by assembly errors, and improves production efficiency while reducing manufacturing costs.

[0052] According to one embodiment of the present invention, along the length direction of the aluminum sheet 102, the length of the aluminum sheet 102 is greater than the length of the boss structure 104, and mounting holes 110 for mounting plastic 106 are provided on the segments of the aluminum sheet 102 that extend beyond the boss structure 104.

[0053] In one embodiment of the present invention, the length of the aluminum sheet 102 is longer than that of the boss structure 104, and the two ends extend by an equal amount to form a mounting section for mounting the plastic 106. Each section is provided with a mounting hole 110 for mounting the plastic 106.

[0054] The upper plastic 106 is installed on the extended section of the aluminum sheet 102, away from the stress concentration area of ​​the boss structure 104. This reduces the impact of boss deformation on its installation stability and ensures long-term stability of the creepage distance. The independent mounting hole 110 design allows the upper plastic 106 to be removed and replaced individually without disassembling the boss structure 104 or the pole post 112, reducing maintenance difficulty and cost. The rigid support of the mounting section and the stop part 108 of the upper plastic 106 complement each other, jointly resisting the warping deformation of the aluminum sheet 102 and improving the overall structural strength of the cover plate.

[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 housing and the stop portion 108 of the cell cover plate work together to form multi-level insulation protection: the insulating coating of the outer shell body blocks the external conductive path, and the stop portion 108 extends the internal creepage distance. The combination of the two effectively reduces the risk of short circuit of the battery under high voltage, which is especially suitable for high-voltage cell modules. The outer shell body provides rigid support for the cell cover plate, reducing the impact of external impact or vibration on the boss structure 104 and the stop portion 108, and avoiding changes in creepage distance due to deformation; the cooperation between the sealing gasket and the insulating partition prevents the electrolyte from corroding the housing and avoids electrochemical corrosion between the housing and the aluminum sheet 102, thus extending the equipment life.

[0057] The housing provided in the second aspect of this utility model forms a closed structure that combines insulation protection and structural support by integrating the aforementioned cell cover plate with stop portion 108.

[0058] The housing includes the outer shell body and the aforementioned cell cover plate. The outer shell body is a hollow cavity with one open end, made of aluminum alloy or high-strength engineering plastic, and the inner wall is provided with an insulating coating to prevent direct conductivity with the bare aluminum sheet 102 of the cell cover plate; the cell cover plate is installed on the open end of the outer shell body by laser welding or bolt fastening, and a nitrile rubber sealing gasket is provided between the edge of the cover plate and the outer shell body to ensure the liquid and air tightness of the housing 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 stop portion 108 of the cell cover and the insulation design of the casing work together to effectively extend the creepage distance and reduce the risk of arc breakdown under high voltage. Especially when fast charging causes the temperature of the terminal 112 to rise, it can prevent short circuits caused by insulation failure between the connecting piece and the aluminum sheet 102, ensuring battery safety. The layout of the stop portion 108 does not occupy the functional areas of the boss structure 104 and the terminal 112, ensuring smooth current transmission path; the clearance design of the casing provides space for heat dissipation components, allowing the heat of the battery to dissipate in time during fast charging, avoiding the impact of high temperature on insulation performance, and achieving compatibility between safety and fast charging.

[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, the aforementioned cell cover plate, and an electrode lead-out assembly. The cell body is a wound or stacked electrode assembly, immersed in the electrolyte, and its tabs are electrically connected to the terminal posts 112 of the cell cover plate via connecting tabs. If a casing is used, the cell body is fixed inside the casing by an insulating bracket, and the casing and the cell cover plate 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 structure protruding in a direction away from the lower plastic; An upper plastic is installed on the light aluminum sheet along the length of the light aluminum sheet. The upper plastic is located on both sides of the boss structure, and a stop portion for increasing the creepage distance is formed on the upper plastic.

2. The cell cover plate according to claim 1, characterized in that, The stop portion is formed on the side of the upper plastic facing the boss structure.

3. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the aluminum sheet, the height of the stop portion is greater than the height of the boss structure.

4. The cell cover plate according to claim 1, characterized in that, It also includes an electrode post and a connecting piece. When the connecting piece is connected to the electrode post, the plane where the top surface of the stop portion is located is coplanar with the plane where the top surface of the connecting piece is located along the thickness direction of the aluminum sheet.

5. The cell cover plate according to claim 1, characterized in that, Along the width direction of the aluminum sheet, the width W1 of the stop portion is greater than the width W2 of the upper plastic.

6. The cell cover plate according to claim 1, characterized in that, Along the width direction of the aluminum sheet, the width W1 of the stop portion, the width W3 of the boss structure, and the width W4 of the aluminum sheet satisfy W3≤W1≤W4.

7. The cell cover plate according to any one of claims 1 to 6, characterized in that, The stop portion is integrally formed with the upper plastic.

8. The cell cover plate according to any one of claims 1 to 6, characterized in that, Along the length of the aluminum sheet, the length of the aluminum sheet is greater than the length of the boss structure, and mounting holes for mounting the upper plastic are provided on the segments of the aluminum sheet that extend beyond the boss structure.

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.

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