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, including a pair of split setting lower plastic body, and compensation section is formed on at least one lower plastic body;Aluminum sheet, in the case where aluminum sheet's first side surface is installed in a pair of lower plastic body, compensation section is adapted to occur deformation to compensate the installation gap of pole and lower plastic body.The elastic deformation of the compensation section in the electric core cover plate absorbs the pulling stress when riveting pole, reduces the cracking phenomenon caused by stress concentration.In the long-term use process, the fracture incidence of lower plastic body is effectively reduced.The deformation compensation of compensation section makes the installation gap of pole and lower plastic body evenly distributed, when using with sealing structure, improve the uniformity of sealing pressure, effectively prevent electrolyte leakage.The elastic support effect of compensation section reduces the warping deformation of lower plastic body in temperature cycle, maintains the stability of the combination of aluminum sheet and lower plastic.

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] With the continued development and widespread adoption of electric vehicles and mobile devices, the demand for fast charging technology is increasing to meet users' needs for quickly restoring battery power. However, during fast charging, the protruding structures such as the terminals and connecting pieces on the cell cover cause a rapid rise in temperature, posing a challenge to the stability and lifespan of the cell.

[0003] Currently, the industry mainly focuses on cooling the large surface and bottom of the battery cell. However, due to the protruding parts on the cell cover, it is impossible to directly install cooling structures on the cell cover. In particular, traditional water-cooling plates cannot fit snugly against the terminals, which not only affects the cooling effect but may also lead to the detachment and damage of the terminals and connecting pieces. Therefore, existing cooling designs are largely unable to effectively solve these thermal management problems on the cell cover, especially during fast charging.

[0004] One solution is to use a contoured lower plastic insert to better fit the protrusions on the aluminum sheet. This contoured lower plastic insert reduces tensile forces, thereby improving the fit. However, even with a contoured lower plastic insert, tensile forces still exist, especially during riveting, which can cause the lower plastic insert to fail to fit the aluminum sheet effectively, thus affecting the stability of the tab. Utility Model Content

[0005] This utility model provides a battery cell cover plate to solve the defect in the related art where the lower plastic of the battery cell cover plate cannot withstand tensile force.

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

[0007] The first aspect of this utility model provides a battery cell cover plate, comprising: The lower plastic includes a pair of separately disposed lower plastic bodies, and a compensation segment is formed on at least one of the lower plastic bodies; When the aluminum sheet is mounted on a pair of lower plastic bodies on its first side, the compensation section is adapted to deform to compensate for the mounting gap between the pole and the lower plastic body.

[0008] According to one embodiment of the present invention, a first boss portion is formed on the second side of the aluminum sheet, which protrudes in a direction away from the lower plastic, and a second boss portion is formed on the lower plastic body for fitting with the first boss portion.

[0009] According to one embodiment of the present invention, the aluminum sheet is adapted to be installed and positioned with the lower plastic body via a positioning structure.

[0010] According to one embodiment of the present invention, the positioning structure includes: A riveting post is formed in one of the aluminum sheet and the lower plastic body; The riveting hole is provided corresponding to the riveting post, and the riveting hole is formed in another part of the light aluminum sheet and the lower plastic body.

[0011] According to one embodiment of the present invention, the compensation segment extends along the width direction of the aluminum sheet.

[0012] According to one embodiment of the present invention, the compensation segment includes a protruding structure or a recessed structure formed on the lower plastic body; and / or The compensation section includes a protruding structure or a recessed structure formed on the second boss portion.

[0013] According to one embodiment of the present invention, along the length direction of the aluminum sheet, the sum of the lengths of the second boss portions on a pair of lower plastic bodies is less than or equal to the length of the first boss portion.

[0014] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet, the height of the second boss is less than the height of the first boss.

[0015] According to one embodiment of the present invention, in the width direction of the aluminum sheet, the width of the second boss portion is smaller than the width of the first boss portion.

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

[0017] According to the first aspect of the present invention, the cell cover plate of the compensation section absorbs the tensile stress during the riveting of the electrode post, reducing cracking caused by stress concentration. During long-term use, it effectively reduces the fracture rate of the lower plastic body. The deformation compensation of the compensation section ensures a uniform distribution of the installation gap between the electrode post and the lower plastic body. When used in conjunction with a sealing structure, it improves the uniformity of sealing pressure and effectively prevents electrolyte leakage. The elastic support of the compensation section reduces the warping deformation of the lower plastic body during temperature cycling, maintaining the bonding stability between the aluminum sheet and the lower plastic. It maintains stable stress compensation capability during long-term use. The design of the compensation section allows for a wider tolerance range in the electrode post riveting process parameters, reducing equipment precision requirements and improving production yield. Simultaneously, the split lower plastic body facilitates injection mold design and extends mold life.

[0018] According to the battery provided in the second aspect of this utility model, the split lower plastic body of the cell cover and the compensation section work together to effectively absorb the tensile stress during terminal riveting and battery charge-discharge cycles, reduce the risk of lower plastic breakage, ensure long-term stable connection between the terminal and the cell body, and reduce the probability of battery failure due to structural failure. The tight fit between the first and second protrusions and the precise alignment of the positioning structure, combined with the compensation section's compensation for installation gaps, improves the insulation and sealing performance of the cell cover, reducing electrolyte leakage and short-circuit risks. At the same time, the stable structural design allows the battery to maintain stable electrical performance under vibration, impact, and other conditions. The deformation buffering effect of the compensation section reduces the warping deformation of the lower plastic body during temperature cycling, maintains the bonding stability between the aluminum sheet and the lower plastic, reduces fluctuations in terminal contact resistance, reduces damage to the cell body from local overheating, and slows down the capacity decay rate. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0021] Figure 2 This is a schematic exploded view of the battery cell cover plate provided by this utility model.

[0022] Figure 3 This is a schematic cross-sectional view of the battery cell cover plate provided by this utility model.

[0023] Figure 4 This is a schematic perspective view of the aluminum sheet provided by this utility model.

[0024] Figure 5 This is a schematic perspective view of the plastic substrate provided by this utility model.

[0025] Figure label: 100. Lower plastic body; 102. Compensation section; 104. Light aluminum sheet; 106. First boss part; 108. Second boss part; 110. Riveting post; 112. Riveting hole; 114. Pole 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: The lower plastic includes a pair of separately disposed lower plastic bodies 100, and a compensation segment 102 is formed on at least one lower plastic body 100; When the aluminum sheet 104 is mounted on a pair of lower plastic bodies 100 on its first side, the compensation section 102 is adapted to deform to compensate for the mounting gap between the pole and the lower plastic body 100.

[0028] According to the first aspect of the present invention, the elastic deformation of the compensation section 102 absorbs the tensile stress during the riveting of the electrode post, reducing cracking caused by stress concentration. During long-term use, it effectively reduces the fracture rate of the lower plastic body 100. The deformation compensation of the compensation section 102 ensures a uniform distribution of the installation gap between the electrode post and the lower plastic body 100. When used in conjunction with a sealing structure, it improves the uniformity of sealing pressure and effectively prevents electrolyte leakage. The elastic support of the compensation section 102 reduces the warping deformation of the lower plastic body 100 during temperature cycling, maintaining the bonding stability between the aluminum sheet 104 and the lower plastic. It maintains stable stress compensation capability during long-term use. The design of the compensation section 102 allows for a wider tolerance range in the electrode post riveting process parameters, reducing equipment precision requirements and improving production yield. Simultaneously, the split lower plastic body 100 facilitates injection mold design and extends mold life.

[0029] Please continue reading Figures 1 to 5 The battery cell cover provided in the first aspect of this utility model solves the stress concentration problem after the pole post is riveted by setting a compensation section 102 in the lower plastic body 100.

[0030] The lower plastic can be made of high-strength insulating material and consists of a pair of separate lower plastic bodies 100, with a compensation section 102 formed on at least one lower plastic body 100.

[0031] The aluminum sheet 104 can be a thin metal plate with an insulating surface. The first side of the aluminum sheet 104 is bonded to the lower plastic body 100 through an injection molding insert process, and the bonding surface is provided with microstructures to enhance the bonding force.

[0032] When the pole is fixed to the mounting position of the lower plastic body 100 by cold forging and riveting, the riveting force causes a radial expansion force between the pole and the mounting part, resulting in the lower plastic body 100 being pulled to both sides. At this time, the compensation section 102 undergoes elastic deformation, absorbing and dispersing the tensile stress, ensuring that it returns to its original shape after the stress is released.

[0033] According to one embodiment of the present invention, a first boss portion 106 is formed on the second side of the aluminum sheet 104, which protrudes in a direction away from the lower plastic, and a second boss portion 108 is formed on the lower plastic body 100 for fitting with the first boss portion 106.

[0034] In one embodiment of this utility model, a first protrusion 106 is formed on the second side of the aluminum sheet 104 by stamping. The protrusion direction is opposite to that of the lower plastic sheet, and the overall outline is adapted to the functional area of ​​the aluminum sheet 104. A second protrusion 108 is formed on the side of the lower plastic body 100 facing the aluminum sheet 104. Its shape and orientation are completely matched with the first protrusion 106. The contact surfaces of the two are tightly contacted through injection molding, with no obvious gaps. The second protrusion 108 and the lower plastic body 100 are an integral structure, distributed below the aluminum sheet 104 due to the separate design of the lower plastic body 100.

[0035] The mutual mating of the first protrusion 106 and the second protrusion 108 increases the contact area between the aluminum sheet 104 and the lower plastic, reducing stress concentration caused by local gaps and making the bond between the two more stable. The mating structure of the protrusions can disperse the stress during pole riveting to a larger area, avoiding stress concentration in the weak parts of the lower plastic body 100, and further reducing the risk of breakage in conjunction with the compensation section 102. The tightly mating protrusion structure reduces the path for electrolyte or impurities to penetrate, enhances the insulation effect between the aluminum sheet 104 and the lower plastic, and improves the safety of the battery cell.

[0036] According to one embodiment of the present invention, the aluminum sheet 104 is adapted to be installed and positioned with the lower plastic body 100 by means of a positioning structure.

[0037] In one embodiment of this utility model, positioning structures are distributed on the edges or non-functional areas of the aluminum sheet 104 and the lower plastic body 100 to ensure accurate relative positioning during assembly. The positioning structures include mating protrusions and grooves. The protrusions are formed on one side of the aluminum sheet 104 or the lower plastic body 100, and the grooves are formed on the other side. Their shapes match, and pre-fixation is achieved during assembly through interference fit or clearance fit. There are at least two sets of positioning structures, symmetrically distributed along the length of the aluminum sheet 104 to avoid misalignment during assembly.

[0038] The positioning structure restricts the relative displacement between the aluminum sheet 104 and the lower plastic body 100, ensuring accurate alignment of key structures such as the electrode mounting position and the boss portion, and avoiding abnormal installation gaps caused by misalignment. Precise positioning reduces additional stress generated during assembly due to forced alignment, preventing deformation or cracking of the lower plastic body 100 due to uneven stress, and protecting the functional integrity of the compensation section 102. The standardized positioning structure makes assembly errors controllable during mass production, ensuring uniform performance parameters for each cell cover and reducing quality fluctuations caused by individual differences.

[0039] According to one embodiment of the present invention, the positioning structure includes: The riveting post 110 is formed in one of the light aluminum sheet 104 and the lower plastic body 100; The riveting hole 112 is provided in correspondence with the riveting post 110 for riveting. The riveting hole 112 is formed in another part of the light aluminum sheet 104 and the lower plastic body 100.

[0040] In one embodiment of this utility model, the riveting post 110 is a cylindrical or conical protrusion. If it is formed on the aluminum sheet 104, it is made of the same metal material as the aluminum sheet 104; if it is formed on the lower plastic body 100, it is a one-piece plastic molding structure. The riveting hole 112 is a through hole that matches the riveting post 110. It is opened on the corresponding lower plastic body 100 or aluminum sheet 104, and the hole diameter is slightly smaller than the diameter of the riveting post 110. After the riveting post 110 is deformed by the cold riveting process, it is tightly connected with the riveting hole 112, thereby fixing the aluminum sheet 104 to the lower plastic body 100. The number, position and positioning structure of the riveting posts 110 and the riveting holes 112 correspond to each other, which enhances the assembly stability.

[0041] The riveting structure achieves a rigid connection between the aluminum sheet 104 and the lower plastic body 100 through mechanical interlocking. Combined with the elastic deformation of the compensation section 102, it can resist external pulling forces and buffer stress, improving the overall structural stability. The riveting process can be completed in one step after positioning, eliminating the need for additional fasteners, reducing assembly steps, and ensuring uniform connection strength to prevent localized loosening. The riveting location avoids the compensation section 102 and the boss portion to prevent affecting the deformation space of the compensation section 102 and ensure its proper stress compensation function during pole post riveting.

[0042] According to one embodiment of the present invention, the compensation segment 102 extends along the width direction of the aluminum sheet 104.

[0043] In one embodiment of this utility model, the compensation segment 102 extends along the width direction of the aluminum sheet 104 and is distributed near the edge of the lower plastic body 100, close to the pole mounting portion, which facilitates direct absorption of the lateral tensile force generated during pole riveting. The extension direction of the compensation segment 102 is perpendicular to the length direction of the lower plastic body 100, and its two ends are respectively connected to the main body and the edge of the lower plastic body 100, forming a transverse stress buffer structure.

[0044] The compensation section 102, extending along the width direction, can directly cope with the lateral tensile force during pole riveting. Its deformation direction is consistent with the stress direction, improving stress absorption efficiency and effectively reducing the risk of fracture of the lower plastic body 100. The width extension allows the compensation section 102 to simultaneously take into account the stress distribution on both sides of the lower plastic body 100, avoiding skew caused by excessive force on one side and ensuring uniform compensation of the pole installation gap. The design extending along the width direction does not occupy the functional area of ​​the aluminum sheet 104 along its length, reserving sufficient space for poles, bosses, and other structures, achieving a compact structural layout.

[0045] According to one embodiment of the present invention, the compensation section 102 includes a protruding structure or a recessed structure formed on the lower plastic body 100, or the compensation section 102 includes a protruding structure or a recessed structure formed on the second boss portion 108, or the compensation section 102 includes a protruding structure or a recessed structure formed on the lower plastic body 100 and a protruding structure or a recessed structure formed on the second boss portion 108.

[0046] In one embodiment of this utility model, the protruding structure of the compensation section 102 is manifested as a local bulge on the surface of the lower plastic body 100 or the second protrusion portion 108, which is strip-shaped or arc-shaped. The thickness of the protruding part is slightly thinner than the surrounding area, which facilitates elastic deformation. The recessed structure is manifested as grooves or concave areas on the surface, which are also distributed in a strip shape. A deformable buffer zone is formed by local thinning of the material. The protruding or recessed structure is integrally formed with the lower plastic body 100 and the second protrusion portion 108, and its direction is consistent with the stress transmission direction.

[0047] The raised or recessed structure, by altering the local material thickness, makes the elastic deformation performance of the compensation section 102 more adaptable to the stress magnitude. This allows it to absorb instantaneous stress during riveting and provide continuous buffering during temperature cycling. Different types of compensation sections 102 can be flexibly selected based on the shape and stress distribution characteristics of the lower plastic body 100, ensuring effective compensation even in complex structural areas. The structural design of the compensation section 102 confines deformation to specific areas, preventing dimensional deviations in the functional areas of the lower plastic body 100 caused by deformation, and ensuring the accuracy of the pole installation.

[0048] According to one embodiment of the present invention, along the length direction of the aluminum sheet 104, the sum of the lengths of the second boss portions 108 on a pair of lower plastic bodies 100 is less than or equal to the length of the first boss portion 106.

[0049] In one embodiment of this utility model, along the length of the aluminum sheet 104, the first boss portion 106 covers the main functional area of ​​the aluminum sheet 104, and its length matches the core working area of ​​the aluminum sheet 104. A pair of separate lower plastic bodies 100 have second boss portions 108 distributed along their length, the sum of their lengths not exceeding the length of the first boss portion 106, and their respective extension ranges not exceeding the boundary of the first boss portion 106. A gap can be reserved between the second boss portions 108 to avoid interference caused by overlap at the joint of the separate lower plastic bodies 100.

[0050] The length control of the second boss portion 108 ensures that the split design of the lower plastic body 100 does not lead to overlapping boss structures, reducing mutual compression during assembly and protecting the deformation space of the compensation section 102. The matching of the boss portion lengths ensures that the stress transmission range is consistent with the coverage area of ​​the first boss portion 106, preventing stress from diffusing to the non-functional areas of the aluminum sheet 104 and improving the accuracy of force transmission. The total length of the split second boss portion 108 is controllable, reducing the complexity of the injection mold, facilitating high-precision molding, and reducing material waste.

[0051] According to one embodiment of the present invention, along the thickness direction of the aluminum sheet 104, the height of the second boss portion 108 is less than the height of the first boss portion 106; along the width direction of the aluminum sheet 104, the width of the second boss portion 108 is less than the width of the first boss portion 106.

[0052] In one embodiment of this utility model, the height difference in the thickness direction and the width difference in the width direction ensure that the first boss 106 and the second boss 108 will not interfere with each other during installation, avoid assembly deformation caused by local protrusions or depressions, and improve the overall structural compatibility of the battery.

[0053] A second aspect of this utility model provides a battery, including the cell cover plate as described above.

[0054] According to the battery provided in the second aspect of this utility model, the split lower plastic body 100 of the cell cover plate and the compensation section 102 work together to effectively absorb the tensile stress during the riveting of the terminal posts and the charging and discharging cycles of the battery, reduce the risk of lower plastic breakage, ensure the long-term stability of the connection between the terminal posts and the cell body, and reduce the probability of battery failure due to structural failure. The tight fit between the first protrusion 106 and the second protrusion 108, the precise alignment of the positioning structure, and the compensation section 102's compensation for the installation gap improve the insulation and sealing performance of the cell cover plate, reducing the risk of electrolyte leakage and short circuit; at the same time, the stable structural design allows the battery to maintain stable electrical performance under conditions such as vibration and impact. The deformation buffering effect of the compensation section 102 reduces the warping deformation of the lower plastic body 100 during temperature cycling, maintains the bonding stability between the aluminum sheet 104 and the lower plastic, reduces the fluctuation of the terminal contact resistance, reduces the damage to the cell body caused by local overheating, and slows down the capacity decay rate.

[0055] The battery provided in the second aspect of this utility model forms a complete energy storage device by integrating the cell cover plate with the above-mentioned split contour plastic riveting structure.

[0056] The battery includes a casing, a cell body, an electrolyte, and a cell cover plate. The casing is a hollow structure with one open end, made of corrosion-resistant metal or high-strength plastic, and houses the cell body and electrolyte. The cell cover plate is fixed to the open end of the casing by welding or sealing adhesive. A sealing element is provided between the edge of the cover plate and the casing to ensure the liquid and air tightness of the internal space and prevent electrolyte leakage.

[0057] 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: The lower plastic includes a pair of separately disposed lower plastic bodies, and a compensation segment is formed on at least one of the lower plastic bodies; When the aluminum sheet is mounted on a pair of lower plastic bodies on its first side, the compensation section is adapted to deform to compensate for the mounting gap between the pole and the lower plastic body.

2. The cell cover plate according to claim 1, characterized in that, The second side of the aluminum sheet has a first protrusion that protrudes in a direction away from the lower plastic, and the lower plastic body has a second protrusion for fitting with the first protrusion.

3. The cell cover plate according to claim 2, characterized in that, The aluminum sheet is suitable for installation and positioning with the lower plastic body via a positioning structure.

4. The cell cover plate according to claim 3, characterized in that, The positioning structure includes: A riveting post is formed in one of the aluminum sheet and the lower plastic body; The riveting hole is provided corresponding to the riveting post, and the riveting hole is formed in another part of the light aluminum sheet and the lower plastic body.

5. The cell cover plate according to claim 2, characterized in that, The compensation segment extends along the width direction of the aluminum sheet.

6. The cell cover plate according to claim 5, characterized in that, The compensation section includes a raised or recessed structure formed on the lower plastic body; and / or The compensation section includes a protruding structure or a recessed structure formed on the second boss portion.

7. The cell cover plate according to any one of claims 2 to 6, characterized in that, Along the length of the aluminum sheet, the sum of the lengths of the second boss portions on the pair of lower plastic bodies is less than or equal to the length of the first boss portion.

8. The cell cover plate according to any one of claims 2 to 6, characterized in that, Along the thickness direction of the aluminum sheet, the height of the second boss is less than the height of the first boss.

9. The cell cover plate according to any one of claims 2 to 6, characterized in that, In the width direction of the aluminum sheet, the width of the second boss portion is smaller than the width of the first boss portion.

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

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