An upper plastic part, a battery cover plate and a battery

Abstract

This invention belongs to the field of battery technology, specifically disclosing an upper plastic component, a battery cover, and a battery. The upper plastic component includes a base plate and two first side plates, which are respectively connected to both ends of the base plate along a first direction. The end face of each first side plate facing the cover body has a thinning groove and two thinning holes, with the two thinning holes located on both sides of the thinning groove along a second direction. The thinning groove and thinning holes reduce the thickness of some parts of the first side plates. After injection molding, the shrinkage rate of each part of the first side plate is consistent with that of the base plate, resulting in high dimensional accuracy of the injection-molded upper plastic component. This invention also provides a battery cover and a battery, including the aforementioned upper plastic component.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to an upper plastic part, a battery cover, and a battery. Background Technology

[0002] A lithium-ion battery typically consists of a cover, a casing, and electrode assemblies. The cover and casing are welded together to form a sealed space protecting the electrode assemblies. The electrode assemblies are housed within the casing, and their tabs are electrically connected to terminals integrated into the cover to draw the battery's internal current out. The cover also integrates upper and lower plastic components, which insulate the terminals from the cover.

[0003] The upper plastic parts are generally formed by injection molding. However, due to the large thickness of the side plates at both ends of the upper plastic parts along the length direction, shrinkage is likely to occur after injection molding, resulting in a decrease in the dimensional accuracy of the finished upper plastic parts. This leads to a low assembly yield when assembling the upper plastic parts with the cover plate, reduced insulation performance, and a risk of short circuits. Summary of the Invention

[0004] The primary objective of this invention is to provide an upper plastic part, wherein the first side plates at both ends of the upper plastic part along the length direction are provided with thinning grooves and thinning holes, which alleviates the shrinkage problem of the upper plastic part after injection molding, resulting in higher dimensional accuracy and better insulation performance.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention provides an upper plastic part, comprising:

[0007] The base plate is located on one side of the cover plate body along a third direction;

[0008] The first side plate is connected to the end of the bottom plate along the first direction. The end face of the first side plate facing the cover plate body is provided with a thinning groove and two thinning holes. The two thinning holes are arranged on both sides of the thinning groove along the second direction.

[0009] Wherein, the width of the opening of the thinning groove along the second direction is W1, the width of the first side plate along the second direction is W, and W1 and W satisfy: 1 / 3≤W1 / W≤2 / 3.

[0010] Optionally, the upper plastic part includes a second side plate, which is connected to the end of the bottom plate along the second direction. The second side plate is adjacent to the first side plate, and the bottom plate, the first side plate, and the second side plate form a receiving groove.

[0011] Along the second direction, the distance between the side of the thinning hole away from the thinning groove and the outer wall of the second side plate is C1, and the value of C1 is in the range of 0.5mm≤C1≤1.5mm.

[0012] Optionally, the thinning hole is a blind hole, and along the third direction, the distance between the bottom wall of the blind hole and the end face of the first side plate on the side away from the cover plate body is T2;

[0013] The value range of T2 is: 0.5mm≤T2≤1.5mm.

[0014] Optionally, the thickness of the base plate along a third direction is T1;

[0015] The value range of T1 is: 0.5mm≤T1≤1.5mm.

[0016] Optionally, along the second direction, the distance between the side of the thinning hole near the thinning groove and the first groove sidewall of the thinning groove is B, and the value of B is in the range of 0.5mm≤B≤1.5mm.

[0017] Optionally, the thinning groove further includes a bottom wall and a second side wall, the second side wall being adjacent to the first side wall, and the bottom wall being connected to the first side wall and the second side wall.

[0018] Along the third direction, the distance between the bottom wall of the groove and the end face of the first side plate opposite to the cover plate body is T3, and the value of T3 is in the range of 0.5mm≤T3≤2.0mm.

[0019] Optionally, the first sidewall of the tank is inclined relative to the bottom wall of the tank, and the included angle between the first sidewall of the tank and the bottom wall of the tank is α, where the value of α is in the range of 90°≤α≤150°.

[0020] Optionally, the base plate is provided with at least one first mounting hole for the pole post to pass through, and the first mounting hole is provided with a limiting flange in the circumferential direction.

[0021] The second objective of this invention is to provide a battery cover with high assembly precision between the plastic parts and the cover body, and good safety performance.

[0022] To achieve this objective, the present invention adopts the following technical solution:

[0023] The present invention provides a battery cover plate, including a cover plate body, a terminal post, and an upper plastic component as described in any of the above embodiments. The upper plastic component is disposed on one side of the cover plate body along a third direction, and the terminal post passes through the upper plastic component and the cover plate body.

[0024] A third objective of this invention is to provide a battery that has good safety.

[0025] To achieve this objective, the present invention adopts the following technical solution:

[0026] The present invention provides a battery, including the battery cover plate described above.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention provides an upper plastic part, including a base plate and two first side plates. The base plate is disposed on one side of a cover plate body along a third direction. The two first side plates are respectively connected to the two ends of the base plate along a first direction. A thinning groove and two thinning holes are provided on the end face of the first side plate facing the cover plate body. The two thinning holes are disposed on both sides of the thinning groove along a second direction. The thinning groove and thinning holes reduce the thickness of some parts of the first side plate. After injection molding of the upper plastic part, the shrinkage rate of each part of the first side plate is consistent with that of the base plate, resulting in high dimensional accuracy of the injection-molded upper plastic part.

[0029] This invention provides a battery cover, including a cover body, terminals, and an upper plastic component. The upper plastic component is disposed on one side of the cover body along a third direction, and the terminals pass through the upper plastic component and the cover body. The assembly precision between the upper plastic component and the cover body is high, resulting in good safety performance.

[0030] The present invention provides a battery including the aforementioned battery cover, which has good safety. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the upper plastic part provided in the embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the upper plastic part provided in an embodiment of the present invention from another perspective;

[0034] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0035] Figure 4 This is a bottom view of the upper plastic part provided in the embodiment of the present invention;

[0036] Figure 5 yes Figure 4 Sectional view of section BB;

[0037] Figure 6 yes Figure 5A magnified view of a section at point D;

[0038] Figure 7 yes Figure 4 A sectional view of section C-C;

[0039] Figure 8 This is an exploded view of the battery cover provided in an embodiment of the present invention.

[0040] In the picture:

[0041] 100. Upper plastic part; 110. Base plate; 111. First mounting hole; 112. Limiting flange; 120. First side plate; 121. Thinning groove; 1211. First groove side wall; 1212. Second groove side wall; 1213. Groove bottom wall; 122. Thinning hole; 1221. Hole bottom wall; 130. Second side plate; 1101. Receiving groove;

[0042] 200, Cover plate body; 210, Limiting groove; 220, Second mounting hole; 230, Annular groove;

[0043] 300, pole post; 310, post body; 320, plate body; 400, lower plastic part; 410, third mounting hole; 500, connecting block; 510, fourth mounting hole; 600, seal. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0048] like Figures 1-5 As shown, this embodiment provides an upper plastic component 100, which is disposed on one side of the cover plate body 200 along a third direction. The upper plastic component 100 includes a base plate 110 and two first side plates 120. The base plate 110 is disposed on one side of the cover plate body 200 along a third direction, and the two first side plates 120 are respectively connected to both ends of the base plate 110 along a first direction (i.e., the length direction of the base plate 110). The end face of the first side plate 120 facing the cover plate body 200 is provided with a thinning groove 121 and two thinning holes 122. The two thinning holes 122 are disposed on both sides of the thinning groove 121 along a second direction. The aforementioned first direction is... Figure 1 The X-axis direction shown is the second direction. Figure 1 The Y-axis direction shown is the third direction. Figure 1 The Z-axis direction is shown in the diagram. The thickness of a portion of the first side plate 120 is reduced by the thinning groove 121 and thinning hole 122. After injection molding of the upper plastic part 100, the shrinkage rate at various locations of the first side plate 120 is low, and the dimensional accuracy of the upper plastic part 100 after injection molding is high.

[0049] See also Figure 4 and Figure 7The width of the opening of the thinning groove 121 along the second direction is W1, and the width of the first side plate 120 along the second direction is W. W1 and W satisfy the following condition: 1 / 3 ≤ W1 / W ≤ 2 / 3. For example, the value of W1 / W can be 1 / 3, 1 / 2, or 2 / 3, etc. Specifically, the range of W1 is 2.5mm ≤ W1 ≤ 16.0mm, and the range of W is 3.75mm ≤ W ≤ 48.0mm. For example, when the value of W1 is 2.5mm, the value of W can be 3.75mm, 5mm, or 7.5mm, etc. When the value of W1 is 4mm, the value of W can be 8mm or 12mm, etc. When the value of W1 is 8mm, the value of W can be 12mm, 16mm, or 24mm, etc. When the value of W1 is 13mm, the value of W can be 20mm, 26mm, or 39mm, etc. When the value of W1 is 16mm, the value of W can be 24mm, 32mm, or 48mm, etc. It is important to note that the value of W1 should not be too large; otherwise, the width of the thinning groove 121 along the second direction will be too large, reducing the structural strength of the first side plate 120 and making the upper plastic part 100 prone to deformation during later use. Of course, the value of W1 should also not be too small; otherwise, the dimensional accuracy of the upper plastic part 100 after injection molding will decrease.

[0050] See also Figure 1 The upper plastic part 100 includes two second side plates 130, which are respectively connected to the two ends of the bottom plate 110 along the second direction. The second side plates 130 are adjacent to and connected to the first side plate 120. The bottom plate 110, the first side plate 120 and the second side plate 130 form a receiving groove 1101.

[0051] See Figures 4-7 Along the second direction, the distance between the side of the thinning hole 122 away from the thinning groove 121 and the outer wall of the second side plate 130 is C1, and the value of C1 is in the range of 0.5mm ≤ C1 ≤ 1.5mm. For example, the value of C1 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm, etc. Along the second direction, the distance between the side of the thinning hole 122 near the thinning groove 121 and the first groove side wall 1211 of the thinning groove 121 is B, and the value of B is in the range of 0.5mm ≤ B ≤ 1.5mm. For example, the value of B can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm, etc. By limiting the values ​​of B and C1 to the above ranges, after processing the thinning groove 121 and the thinning hole 122, the residual thickness of the remaining position of the first side plate 120 along the second direction tends to be consistent, which is beneficial to improving the dimensional accuracy of the upper plastic part 100.

[0052] See also Figure 6 and Figure 7Thinning hole 122 is a blind hole. By setting thinning hole 122 as a blind hole, it is possible to prevent electrolyte from entering the gap between upper plastic part 100 and cover plate body 200 through thinning hole 122 during battery filling. This would reduce the sealing accuracy of battery cover and the electrolyte may also corrode the terminal post 300 on cover plate body 200, affecting battery performance.

[0053] Further, along the third direction, the distance between the bottom wall 1221 of the blind hole and the end face of the first side plate 120 on the side away from the cover plate body 200 is T2, and the value of T2 is in the range of 0.5mm≤T2≤1.5mm. For example, the value of T2 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm, etc. The thickness of the bottom plate 110 along the third direction is T1, and the value of T1 is in the range of 0.5mm≤T1≤1.5mm. For example, the value of T1 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm, etc. In some embodiments, B=C1=T2=T1. In this case, the residual thickness of the remaining position after the thinning hole 122 is provided on the first side plate 120 is relatively small, which is beneficial to ensure high dimensional accuracy of the upper plastic part 100 after injection molding. Furthermore, the value of T1 should not be set too small; otherwise, the structural strength of the upper plastic part 100 after injection molding will be low, making it prone to deformation. Additionally, the creepage distance will be small, the insulation performance of the battery cover cannot be guaranteed, and safety will be poor. Conversely, the value of T1 should not be set too large either; otherwise, it may cause shrinkage of the upper plastic part 100 after injection molding, resulting in poor dimensional accuracy.

[0054] See also Figure 3 and Figure 6 The thinning groove 121 also includes a bottom wall 1213 and a second side wall 1212. The second side wall 1212 is adjacent to the first side wall 1211, and the bottom wall 1213 is connected to the first side wall 1211 and the second side wall 1212. Along a third direction, the distance between the bottom wall 1213 and the end face of the first side plate 120 facing away from the cover plate body 200 is T3, and the value of T3 is in the range of 0.5mm ≤ T3 ≤ 2.0mm. For example, the value of T3 can be 0.5mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm, etc. By limiting the value of T3 to the above range, the residual thickness along the third direction of the first side plate 120 after the thinning groove 121 is formed is relatively large, ensuring that the structural strength of the first side plate 120 after the thinning groove 121 is formed is high and it is not easily deformed. The above-mentioned third direction is... Figure 7 The Z-axis direction in the equation.

[0055] See also Figure 7In this embodiment, the thinning groove 121 includes two first groove sidewalls 1211, which are opposite each other along a second direction. Each first groove sidewall 1211 is inclined relative to the groove bottom wall 1213, and the included angle between the first groove sidewall 1211 and the groove bottom wall 1213 is α. The value of α is in the range of 90°≤α≤150°. For example, the value of α can be 90°, 100°, 110°, 130°, or 150°. By inclining the first groove sidewalls 1211, it is easier to demold the upper plastic part 100, and the yield rate of the upper plastic part 100 after injection molding is higher.

[0056] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned upper plastic part 100. See Table 1 for details.

[0057] Table 1

[0058]

[0059] As can be seen from the above results, the values ​​of parameters W1, W, W1 / W, α, T3, T2, T1, B, and C1 in Examples 1 to 10 meet their respective dimensional constraints. The upper plastic part 100 exhibits no shrinkage or deformation after injection molding, demonstrating high dimensional accuracy. The upper plastic part 100 can be precisely assembled with the cover plate body 200. Furthermore, the upper plastic part 100 has high structural strength, is easy to demold after injection molding, has a high yield rate, and produces excellent products.

[0060] In Example 11, the values ​​of parameters W1 / W are less than the minimum value of 1 / 3 ≤ W1 / W ≤ 2 / 3, T3 is less than the minimum value of 0.5mm ≤ T3 ≤ 2.0mm, B is less than the minimum value of 0.5mm ≤ B ≤ 1.5mm, T2 is greater than the maximum value of 0.5mm ≤ T2 ≤ 1.5mm, and C1 is greater than the maximum value of 0.5mm ≤ C1 ≤ 1.5mm. This results in significant differences in wall thickness at various locations of the upper plastic part 100, severe shrinkage and deformation after injection molding, decreased dimensional accuracy of the finished upper plastic part 100, reduced fit accuracy with the cover plate body 200, and low assembly yield. Furthermore, the value of α is less than the minimum value of 90° ≤ α ≤ 150°, making the upper plastic part 100 susceptible to damage during demolding, resulting in low finished product yield and defective products.

[0061] In Example 12, the values ​​of parameters W1 / W are greater than the maximum value of 1 / 3 ≤ W1 / W ≤ 2 / 3, T3 is less than the minimum value of 0.5mm ≤ T3 ≤ 2.0mm, B is less than the minimum value of 0.5mm ≤ B ≤ 1.5mm, T2 is greater than the maximum value of 0.5mm ≤ T2 ≤ 1.5mm, and C1 is greater than the maximum value of 0.5mm ≤ C1 ≤ 1.5mm. This results in significant differences in wall thickness at various locations of the upper plastic part 100, severe shrinkage and deformation after injection molding, decreased dimensional accuracy of the finished upper plastic part 100, reduced fit accuracy with the cover plate body 200, and low assembly yield. Furthermore, the value of α is less than the minimum value of 90° ≤ α ≤ 150°, making the upper plastic part 100 susceptible to damage during demolding, resulting in low finished product yield and defective products.

[0062] In Example 13, the values ​​of parameters W1 / W are less than the minimum value of 1 / 3 ≤ W1 / W ≤ 2 / 3, the value of T3 is greater than the maximum value of 0.5mm ≤ T3 ≤ 2.0mm, the value of B is greater than the maximum value of 0.5mm ≤ B ≤ 1.5mm, the value of T2 is less than the minimum value of 0.5mm ≤ T2 ≤ 1.5mm, and the value of C1 is less than the minimum value of 0.5mm ≤ C1 ≤ 1.5mm. The wall thickness of the upper plastic part 100 varies significantly at different locations, resulting in severe shrinkage and deformation after injection molding. This leads to decreased dimensional accuracy of the finished upper plastic part 100, reduced fit with the cover plate body 200, and low assembly yield. Furthermore, the value of α is greater than the maximum value of 90° ≤ α ≤ 150°. The residual wall thickness between the thinning hole 122 and the thinning groove 121 in the first side plate 120 of the upper plastic part 100 is relatively thin, resulting in severe shrinkage and deformation after injection molding of the upper plastic part 100, decreased structural strength, and product defects.

[0063] In Example 14, the values ​​of parameters W1 / W are greater than the maximum value of 1 / 3 ≤ W1 / W ≤ 2 / 3, T3 is greater than the maximum value of 0.5mm ≤ T3 ≤ 2.0mm, B is greater than the maximum value of 0.5mm ≤ B ≤ 1.5mm, T2 is less than the minimum value of 0.5mm ≤ T2 ≤ 1.5mm, and C1 is less than the minimum value of 0.5mm ≤ C1 ≤ 1.5mm. The wall thickness of the upper plastic part 100 varies significantly at different locations, resulting in severe shrinkage and deformation after injection molding. This leads to decreased dimensional accuracy of the finished upper plastic part 100, reduced fit with the cover plate body 200, and low assembly yield. Furthermore, the value of α is greater than the maximum value of 90° ≤ α ≤ 150°. The residual wall thickness between the thinning hole 122 and the thinning groove 121 in the first side plate 120 of the upper plastic part 100 is relatively thin, causing severe shrinkage and deformation after injection molding of the upper plastic part 100, decreased structural strength, and product defects.

[0064] Taking all factors into consideration, when the dimensions of the upper plastic part 100 meet the above-mentioned dimensional requirements, it can be ensured that the upper plastic part 100 is easy to demold after injection molding, without shrinkage or deformation problems. The finished product of the upper plastic part 100 has high dimensional accuracy, can be accurately assembled with the cover plate body 200, and has high structural strength and high product yield.

[0065] See Figure 2 and Figure 8 This example also provides a battery cover, including a cover body 200, a terminal post 300, the aforementioned upper plastic part 100, lower plastic part 400, and a connecting block 500. The upper plastic part 100 and lower plastic part 400 are respectively disposed on both sides of the cover body 200 along a third direction. At least a portion of the connecting block 500 is embedded in the receiving groove 1101 of the upper plastic part 100. One end of the terminal post 300 passes sequentially through the lower plastic part 400, the cover body 200, the upper plastic part 100, and the connecting block 500 from the side where the lower plastic part 400 is located, and is then riveted and welded to the connecting block 500, thereby fixing the terminal post 300 on the cover body 200. Furthermore, the arrangement of the upper plastic part 100 and the lower plastic part 400 can insulate the terminal post 300 from the cover body 200, ensuring good safety.

[0066] Optionally, the pole post 300 includes a column portion 310 and a plate portion 320 connected to each other. The bottom plate 110 of the upper plastic part 100 is provided with a first mounting hole 111, the cover plate body 200 is provided with a second mounting hole 220, the lower plastic part 400 is provided with a third mounting hole 410, and the connecting block 500 is provided with a fourth mounting hole 510. The column portion 310 of the pole post 300 is sequentially inserted through the third mounting hole 410, the second mounting hole 220, the first mounting hole 111, and the fourth mounting hole 510. The plate portion 320 of the pole post 300 is located on the side of the lower plastic part 400 away from the cover plate body 200. The column portion 310 of the pole post 300 is riveted and welded to the connecting block 500. Furthermore, a sealing element 600 is fitted onto the post portion 310 of the terminal post 300. The sealing element 600 can seal the gap between the terminal post 300 and the cover plate body 200, ensuring good sealing performance of the battery cover plate.

[0067] In some embodiments, a battery cover can be disposed in the blade battery, and the battery cover has two terminals 300. In this case, the corresponding first mounting hole 111, second mounting hole 220, third mounting hole 410, and fourth mounting hole 510 are also provided, thereby meeting the high current overcurrent requirements of the blade battery, preventing the battery cover from overheating, and reducing safety risks. Of course, in other embodiments, the battery cover can also have only one terminal 300, in which case the corresponding first mounting hole 111, second mounting hole 220, third mounting hole 410, and fourth mounting hole 510 are also provided.

[0068] See also Figure 2 and Figure 8 A limiting groove 210 is provided on the end face of the cover body 200 facing the upper plastic part 100. The upper plastic part 100 is partially embedded in the limiting groove 210. The setting of the limiting groove 210 improves the positioning accuracy between the cover body 200 and the upper plastic part 100, ensuring that the second mounting hole 220 is aligned with the first mounting hole 111. The battery cover has a high assembly yield and high assembly accuracy.

[0069] Furthermore, each first mounting hole 111 on the base plate 110 is provided with a limiting flange 112 in the circumferential direction, and the second mounting hole 220 on the cover plate body 200 is provided with an annular groove 230 in the circumferential direction. The annular groove 230 is located on the side facing the upper plastic part 100. The annular groove 230 is adjacent to the bottom wall of the limiting groove 210. The limiting flange 112 on the base plate 110 of the upper plastic part 100 can cooperate with the annular groove 230 on the cover plate body 200 to achieve precise positioning between the upper plastic part 100 and the cover plate body 200, further improving the positioning accuracy between the cover plate body 200 and the upper plastic part 100.

[0070] This embodiment also provides a battery, including the aforementioned battery cover, housing, and electrode assembly. The battery cover is assembled with the housing, forming a space for housing the electrode assembly. The electrode tabs of the electrode assembly are electrically connected to the terminals 300 on the battery cover. The battery cover has high assembly precision, reliable structure, and good battery safety performance.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A plastic part, characterized in that, The upper plastic component includes: The base plate is located on one side of the cover plate body along a third direction; The first side plate is connected to the end of the bottom plate along the first direction. The end face of the first side plate facing the cover plate body is provided with a thinning groove and two thinning holes. The two thinning holes are arranged on both sides of the thinning groove along the second direction. Wherein, the first direction is the length direction of the base plate, the second direction is the width direction of the base plate, the third direction is the thickness direction of the base plate, the width of the opening of the thinning groove along the second direction is W1, the width of the first side plate along the second direction is W, and W1 and W satisfy: 1 / 3≤W1 / W≤2 / 3.

2. The upper plastic part according to claim 1, characterized in that, The upper plastic part includes a second side plate, which is connected to the end of the bottom plate along the second direction. The second side plate is adjacent to the first side plate, and the bottom plate, the first side plate, and the second side plate form a receiving groove. Along the second direction, the distance between the side of the thinning hole away from the thinning groove and the outer wall of the second side plate is C1, and the value of C1 is in the range of 0.5mm≤C1≤1.5mm.

3. The upper plastic part according to claim 2, characterized in that, The thinning hole is a blind hole. Along the third direction, the distance between the bottom wall of the blind hole and the end face of the first side plate on the side away from the cover plate body is T2. The value range of T2 is: 0.5mm≤T2≤1.5mm.

4. The upper plastic part according to claim 1, characterized in that, The thickness of the base plate along the third direction is T1, and the value of T1 is in the range of 0.5mm≤T1≤1.5mm.

5. The upper plastic part according to claim 1, characterized in that, Along the second direction, the distance between the side of the thinning hole near the thinning groove and the first groove sidewall of the thinning groove is B; The value of B is in the range of 0.5mm≤B≤1.5mm.

6. The upper plastic part according to claim 5, characterized in that, The thinning groove also includes a bottom wall and a second side wall, the second side wall being adjacent to the first side wall, and the bottom wall being connected to the first side wall and the second side wall. Along the third direction, the distance between the bottom wall of the groove and the end face of the first side plate opposite to the cover plate body is T3, and the value of T3 is in the range of 0.5mm≤T3≤2.0mm.

7. The upper plastic part according to claim 6, characterized in that, The first sidewall of the tank is inclined relative to the bottom wall of the tank, and the angle between the first sidewall of the tank and the bottom wall of the tank is α; The range of values ​​for α is: 90°≤α≤150°.

8. The upper plastic part according to claim 1, characterized in that, The base plate is provided with at least one first mounting hole, which is used to allow the pole post to pass through, and the first mounting hole is provided with a limiting flange in the circumferential direction.

9. A battery cover, characterized in that, The device includes a cover plate body, an electrode post, and an upper plastic component as described in any one of claims 1-8, wherein the upper plastic component is disposed on one side of the cover plate body along a third direction, and the electrode post passes through the upper plastic component and the cover plate body.

10. A battery, characterized in that, Includes the battery cover as described in claim 9.

Images