Battery cell cover plate and battery cell

Abstract

The application belongs to the technical field of batteries, and specifically discloses a battery cell cover plate and a battery cell. The battery cell cover plate comprises a second plastic part, a cover plate body, a first plastic part and a connecting block which are sequentially stacked. A pole post is riveted to a riveting step on the connecting block after sequentially passing through the second plastic part, the cover plate body, the first plastic part and the connecting block from the side where the pole group is located. The connecting block is provided with a sunken platform in the circumferential direction of the riveting step, and the sunken platform is provided with a groove structure on the bottom wall surface. The riveting step and the sunken platform are both located at one end of the connecting block away from the pole group. The setting of the groove structure enables the connecting block to expand into the groove structure when the pole post is riveted to the connecting block, thereby relieving the circumferential riveting pressure on the connecting block, protecting the connecting block and avoiding deformation or cracking of the connecting block when the connecting block is riveted to the pole post, so that the assembly yield is high. The application also provides a battery cell comprising the battery cell cover plate.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cell cover plate and a cell. Background Technology

[0002] In existing battery cell covers, the terminals are generally fixed to the cover body by riveting. For example, some battery cell covers include a cover body, an upper plastic part, a lower plastic part, a terminal, a riveting block, and a sealing ring. The upper and lower plastic parts are respectively located on both sides of the cover body, the riveting block is located on the side of the upper plastic part away from the cover body, and the sealing ring is fitted over the terminal. Then, the terminal passes through the lower plastic part, the cover body, the upper plastic part, and the riveting block in sequence from the side where the lower plastic part is located before being riveted to the riveting block. However, during the riveting process between the terminal and the riveting block, the riveting block may deform or crack due to excessive axial and radial riveting pressure, resulting in a low assembly yield. Summary of the Invention

[0003] The purpose of this invention is to provide a battery cell cover plate and a battery cell. By setting a groove structure on the connecting block, part of the expansion force during the riveting of the pole post is absorbed, thereby protecting the connecting block and preventing it from deforming or cracking, resulting in a high assembly yield.

[0004] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a battery cell cover plate, comprising: A cover plate body, wherein the cover plate body is provided with a first mounting hole; A first plastic part is disposed on the side of the cover plate body away from the electrode group along a first direction, and a second mounting hole is provided on the first plastic part. A connecting block is provided on the side of the first plastic part away from the cover plate body along the first direction. The connecting block is provided with a third mounting hole. The third mounting hole is provided with a riveting step in the circumferential direction. The riveting step is provided with a countersunk platform in the circumferential direction. The bottom wall of the countersunk platform is provided with a groove structure. The riveting step and the countersunk platform are both located at the end of the connecting block away from the pole group. The second plastic part is disposed on the side of the cover plate body close to the electrode group along the first direction, and the second plastic part is provided with a fourth mounting hole. The pole post passes sequentially through the fourth mounting hole, the first mounting hole, the second mounting hole, and the third mounting hole from the side where the pole group is located along the first direction, and is then riveted to the riveting step.

[0005] Optionally, the groove structure is an annular groove, which is continuously arranged around the circumference of the riveting step.

[0006] Optionally, along the second direction, the distance between the first groove sidewall of the annular groove near its center and the first platform sidewall of the riveting step is e; The value range of e is: 0.5mm ≤ e ≤ 1.5mm; Along the second direction, the distance between the second sidewall of the annular groove on the side away from its center and the second sidewall of the settling platform is b; The value of b is in the range of 0.5mm ≤ b ≤ 1.5mm.

[0007] Optionally, the width of the annular groove along the second direction is t1; The value range of t1 is: 0.15mm≤t1≤0.5mm.

[0008] Optionally, along the first direction, the depth of the annular groove is h, and the depth of the riveting step is L; The range of h is: 1 / 3L≤h≤2 / 3L; The value of L is in the range of 0.5mm≤L≤2mm.

[0009] Optionally, the groove structure includes multiple sub-grooves, which are linear in shape. The multiple sub-grooves are circumferentially spaced on the riveting step. The extension direction of each sub-groove is perpendicular to the first side wall of the riveting step, and one end of the sub-groove extends through the first side wall, while the other end of the sub-groove extends to the second side wall of the settling platform.

[0010] Optionally, the width of the sub-slot is t2; The value range of t2 is: 0.15mm≤t2≤0.5mm.

[0011] Optionally, the perimeter of the first sidewall in the cross section perpendicular to the first direction is S, and the number of the sub-slots is N; The relationship between N, S, and t2 satisfies: 0.01≤(N×t2) / S≤0.1.

[0012] Optionally, the groove structure includes multiple sub-grooves, which are circumferentially spaced on the riveting step. The extension direction of each sub-groove is parallel to the first sidewall of the riveting step, and the sub-grooves are spaced apart from the first sidewall.

[0013] On the other hand, the present invention provides a battery cell including the battery cell cover plate of any of the above embodiments.

[0014] The beneficial effects of this invention are as follows: This invention provides a battery cell cover plate, comprising a second plastic part, a cover plate body, a first plastic part, and a connecting block stacked sequentially along a first direction. The cover plate body has a first mounting hole, the first plastic part has a second mounting hole, and the connecting block has a third mounting hole. A riveting step is provided circumferentially around the third mounting hole, and the second plastic part has a fourth mounting hole. A terminal post passes sequentially through the fourth mounting hole, the first mounting hole, the second mounting hole, and the third mounting hole along the first direction from the side where the electrode group is located, and is then riveted to the riveting step. A countersunk platform is provided circumferentially around the riveting step on the connecting block, and a groove structure is provided on the bottom wall of the countersunk platform. Both the riveting step and the countersunk platform are located at the end of the connecting block away from the electrode group. The groove structure allows the connecting block to expand into the groove structure when the terminal post is riveted to the connecting block, thereby alleviating the riveting pressure circumferentially on the wall of the third mounting hole on the connecting block. This protects the connecting block and prevents deformation or cracking during riveting with the terminal post, resulting in a high assembly yield and high reliability of the assembled battery cell cover plate.

[0015] The present invention also provides a battery cell, including the aforementioned battery cell cover plate. By employing the aforementioned battery cell cover plate, the groove structure on the connecting block can provide sufficient space for material expansion, absorb part of the pressure when the terminal post is riveted to the connecting block, thereby protecting the connecting block and preventing it from deforming or cracking, resulting in high battery cell reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the battery cell cover plate provided in Embodiment 1 of the present invention; Figure 2 This is an exploded view of the battery cell cover plate provided in Embodiment 1 of the present invention; Figure 3 This is a top view of the battery cell cover plate provided in Embodiment 1 of the present invention; Figure 4 yes Figure 3 Sectional view of section I-I; Figure 5 yes Figure 4 Enlarged view of a section at point II; Figure 6 This is a schematic diagram of the connecting block provided in Embodiment 1 of the present invention; Figure 7 This is a top view of the connecting block provided in Embodiment 1 of the present invention; Figure 8 yes Figure 7 Sectional view of section III-III; Figure 9 yes Figure 8 A magnified view of a section at point IV; Figure 10 This is a schematic diagram of the structure of the battery cell cover plate provided in Embodiment 2 of the present invention; Figure 11This is a schematic diagram of the connecting block provided in Embodiment 2 of the present invention; Figure 12 This is a top view of the connecting block provided in Embodiment 2 of the present invention; Figure 13 yes Figure 11 Sectional view of section V-V; Figure 14 yes Figure 13 A magnified view of section VI.

[0017] In the picture: 100. Cover plate body; 101. First mounting hole; 200. First plastic part; 210. Plastic part body; 211. Second mounting hole; 220. Limiting flange; 300. Connecting block; 301. Third mounting hole; 310. Riveting step; 311. First platform side wall; 320. Recessed platform; 321. Bottom wall surface; 322. Second platform side wall; 330. Annular groove; 331. First groove side wall; 332. Second groove side wall; 340. Sub-groove body; 400. Second plastic part; 401. Fourth mounting hole; 500. Pole post; 510. Plate part; 520. Column part; 521. First column; 5211. Protrusion; 522. Second column; 5221. Step part; 600. Sealing element. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Example 1 like Figures 1-5 As shown, this embodiment provides a battery cell cover plate, which includes a cover plate body 100, a first plastic part 200, a connecting block 300, a second plastic part 400, and an electrode post 500. The first plastic part 200 is disposed on the side of the cover plate body 100 away from the electrode group along a first direction; the connecting block 300 is disposed on the side of the first plastic part 200 away from the cover plate body 100 along the first direction; and the second plastic part 400 is disposed on the side of the cover plate body 100 close to the electrode group along the first direction. That is, the second plastic part 400, the cover plate body 100, the first plastic part 200, and the connecting block 300 are stacked sequentially along the first direction. The aforementioned first direction is... Figure 1 The X-axis direction shown is also the thickness direction of the cell cover plate.

[0023] The cover plate body 100 is provided with a first mounting hole 101, the first plastic part 200 is provided with a second mounting hole 211, the connecting block 300 is provided with a third mounting hole 301, the third mounting hole 301 is provided with a riveting step 310 in the circumferential direction, the second plastic part 400 is provided with a fourth mounting hole 401, the pole post 500 passes through the fourth mounting hole 401, the first mounting hole 101, the second mounting hole 211 and the third mounting hole 301 in sequence from the side where the pole group is located along the first direction and is riveted to the riveting step 310, thereby fixing the pole post 500 on the cover plate body 100.

[0024] Furthermore, the riveting step 310 on the connecting block 300 is provided with a countersunk platform 320 in the circumferential direction, and a groove structure is provided on the bottom wall surface 321 of the countersunk platform 320. Both the riveting step 310 and the countersunk platform 320 are located at the end of the connecting block 300 away from the electrode group. Through the setting of the groove structure, when the electrode post 500 is riveted to the connecting block 300, the connecting block 300 can expand into the groove structure, thereby relieving the riveting pressure on the circumferential wall of the third mounting hole 301 on the connecting block 300, thus protecting the connecting block 300 and preventing the connecting block 300 from deforming or cracking when riveted to the electrode post 500. The assembly yield is high, and the reliability of the assembled cell cover is high.

[0025] See also Figure 2 , Figure 4 and Figure 5 In this embodiment, the first mounting hole 101, the second mounting hole 211, the third mounting hole 301, and the fourth mounting hole 401 are all oblong. The pole post 500 includes a plate portion 510 and a column portion 520. The plate portion 510 is located on the side of the second plastic part 400 near the pole assembly. The shape of the column portion 520 in the cross section perpendicular to the first direction matches the shapes of the first mounting hole 101, the second mounting hole 211, the third mounting hole 301, and the fourth mounting hole 401. The column portion 520 passes through the fourth mounting hole 401 on the second plastic part 400, the first mounting hole 101 on the cover plate body 100, the second mounting hole 211 on the first plastic part 200, and the third mounting hole 301 on the connecting block 300, and is then riveted to the connecting block 300. Optionally, the column portion 520 includes a first column 521 and a second column 522 connected to each other. The diameter of the first column 521 is smaller than the diameter of the second column 522. The second column 522 is connected to the plate portion 510. A step portion 5221 is formed between the first column 521 and the second column 522. The connecting block 300 located circumferentially in the third mounting hole 301 abuts against the step portion 5221. The step portion 5221 provides a certain support for the pole post 500 and protects the connecting block 300 from cracking when the pole post 500 is riveted to the connecting block 300. After the first column 521 is riveted to the connecting block 300, a protrusion 5211 is formed at the riveting step 310. The protrusion 5211 cooperates with the plate portion 510 to fix the pole post 500 on the cover plate body 100. For example, the riveting step 310 can be a stepped platform with an L-shaped cross-section. Alternatively, in other embodiments, it can be a conical platform.

[0026] Furthermore, the cell cover also includes a sealing element 600, which is sleeved on the outside of the second column 522. The sealing element 600 is used to seal the gap between the column portion 520 and the cover body 100. The sealing element 600 ensures good sealing performance of the cell cover.

[0027] The first plastic part 200 includes a plastic part body 210 and a limiting flange 220, and a second mounting hole 211 is provided on the plastic part body 210. The limiting flange 220 is provided in the circumferential direction of the plastic part body 210 and extends away from the electrode group along a first direction. The plastic part body 210 and the limiting flange 220 can form a limiting groove, and at least a portion of the connecting block 300 is accommodated in the limiting groove. By adopting the above solution, the positioning accuracy between the connecting block 300 and the first plastic part 200 is improved, which is beneficial to improving the assembly yield of the battery cell cover.

[0028] See Figures 6-9 In this embodiment, the groove structure on the connecting block 300 is an annular groove 330, which is continuously arranged around the circumference of the riveting step 310. Since the third mounting hole 301 is an oblong hole, the riveting step 310 and the annular groove 330 are also oblong in shape. The annular groove 330 includes two arc-shaped segments opposite each other along the second direction and two straight segments opposite each other along the third direction. The groove width of the arc-shaped segments and the straight segments are equal, and the spacing between the annular groove 330 and the riveting step 310 is also equal. The aforementioned second direction is... Figure 6 The Y-axis direction is also the length direction of the cell cover plate. The aforementioned third direction is... Figure 6 The Z-axis direction is also the width direction of the cell cover plate.

[0029] Taking the arc-shaped segment of the annular groove 330 as an example, the arrangement structure of the annular groove 330 on the connecting block 300 is explained. Along the second direction, the distance between the first groove sidewall 331 near the center of the arc-shaped segment of the annular groove 330 and the first platform sidewall 311 of the riveting step 310 is denoted as e. The value of e ranges from 0.5mm to 1.5mm. For example, the value of e can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm. By limiting the value of e to the above range, the structural strength of the annular groove 330 near the riveting step 310 is ensured to be high, which can resist the riveting pressure on the connecting block 300 when the pole post 500 expands, providing a good buffering effect and preventing the connecting block 300 from cracking.

[0030] Along the second direction, the distance between the second groove sidewall 332 on the side of the arc-shaped segment of the annular groove 330 away from its center and the second platform sidewall 322 of the recessed platform 320 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 value of b to the above range, the layout of the annular groove 330 is ensured to be reasonable, facilitating the processing of the annular groove 330.

[0031] Furthermore, along the second direction, the width of the arc-shaped segment of the annular groove 330 is t1, and the value of t1 ranges from 0.15mm to 0.5mm. For example, the value of t1 can be 0.15mm, 0.18mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc. By limiting the value of t1 to the above range, it is ensured that the annular groove 330 will not excessively weaken the mechanical strength of the connecting block 300, thus guaranteeing its overall reliability. At the same time, it is easy to process and form. Otherwise, if the value of t1 is too large, the mechanical strength of the connecting block 300 will decrease too much, which is not conducive to the reliability of its support pole 500; if the value of t1 is too small, the annular groove 330 will be difficult to process, requiring higher processing precision, resulting in greater forming difficulty and a lower manufacturing yield.

[0032] Along the first direction, the depth of the riveting step 310 is L, and the value of L is in the range of 0.5mm ≤ L ≤ 2mm. For example, the value of L can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm, etc. By limiting the value of L within the above range, the thickness of the protrusion 5211 formed after the pole post 500 and the riveting step 310 are larger along the first direction, resulting in higher mechanical strength and less susceptibility to deformation. Consequently, the pole post 500 can be stably fixed to the cover plate body 100 and is less likely to fall off. The value of L should not be too small, otherwise the thickness of the protrusion 5211 along the first direction will be too small, resulting in insufficient mechanical strength and easy deformation, making it easy for the pole post 500 to fall out of the third mounting hole 301. Of course, the value of L should not be too large either, otherwise the riveting pressure required for riveting will be too large, and the connecting block 300 will be more prone to deformation or cracking during riveting, reducing the yield of finished products.

[0033] Furthermore, the depth of the arc-shaped segment of the annular groove 330 is h, and the value of h ranges from 1 / 3L ≤ h ≤ 2 / 3L. For example, the value of h can be 1 / 3L, 5 / 12L, 1 / 2L, 7 / 12L, or 2 / 3L, etc. For example, when the value of L is 0.5mm, the value of h can be 0.17mm, 0.2mm, 0.25mm, 0.3mm, or 0.33mm, etc. When the value of L is 1.2mm, the value of h can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm, etc. When the value of L is 2.0mm, the value of h can be 0.67mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, or 1.33mm, etc. By limiting the value of h to the above range, it is ensured that the annular groove 330 will not excessively weaken the mechanical strength of the connecting block 300, ensuring its overall reliability, while also being easy to process and form. Otherwise, if the value of h is too large, the mechanical strength of the connecting block 300 will decrease too much, which is not conducive to the reliability of its support pole 500; if the value of h is too small, there will be insufficient space for the connecting block 300 to expand, the annular groove 330 will not reliably prevent the connecting block 300 from cracking, and the assembly yield of the cell cover will decrease.

[0034] This embodiment also provides a battery cell, including a housing, an electrode assembly, and the aforementioned battery cell cover. The housing has an opening at at least one end along a first direction, the electrode assembly is disposed within the housing, and the battery cell cover is fastened to one of the openings and welded to the housing. By employing the aforementioned battery cell cover, the annular groove 330 on the connecting block 300 can provide sufficient space for material expansion, absorbing some of the pressure during the riveting of the electrode post 500 to the connecting block 300, thereby protecting the connecting block 300 and preventing deformation or cracking, resulting in high battery cell reliability.

[0035] Example 2 See Figure 10 This embodiment provides a cell cover plate, which differs from the cell cover plate in Embodiment 1 in that the specific configuration of the groove structure on the connecting block 300 is different.

[0036] Specifically, see Figures 11-14In this embodiment, the groove structure on the connecting block 300 includes multiple sub-grooves 340. The sub-grooves 340 are linear and are spaced circumferentially around the riveting step 310. The extension direction of each sub-groove 340 is perpendicular to the first sidewall 311 of the riveting step 310, with one end extending through the first sidewall 311 and the other end extending to the second sidewall 322 of the recessed platform 320. That is, the length of the sub-groove 340 is equal to the width of the recessed platform 320. The multiple sub-grooves 340 also provide sufficient expansion space for the connecting block 300, absorbing some of the pressure during the riveting of the pole post 500 to the connecting block 300, thereby protecting the connecting block 300 and preventing deformation or cracking.

[0037] The width of the sub-groove 340 is t2, and the value of t2 ranges from 0.15mm to 0.5mm. For example, the value of t2 can be 0.15mm, 0.18mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. By limiting the value of t2 to the above range, it is ensured that the sub-groove 340 will not excessively weaken the mechanical strength of the connecting block 300, thus guaranteeing its overall reliability. Simultaneously, it is easier to process and form. Otherwise, if the value of t2 is too large, the mechanical strength of the connecting block 300 will decrease too much, which is detrimental to the reliability of its support pole 500; if the value of t2 is too small, the sub-groove 340 will be difficult to process, requiring higher processing precision, resulting in greater forming difficulty and a lower production yield.

[0038] Furthermore, the perimeter of the first sidewall 311 in the section perpendicular to the first direction is S, and the number of sub-slots 340 is N. The relationship between N, S, and t2 satisfies: 0.01 ≤ (N×t2) / S ≤ 0.1. For example, the value of (N×t2) / S can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1, etc. By limiting the value of (N×t2) / S to the above range, it is ensured that the sub-slots 340 will not excessively weaken the mechanical strength of the connecting block 300, thus ensuring its overall reliability. At the same time, it ensures that the multiple sub-slots 340 can provide sufficient expansion space, avoiding excessive riveting pressure on the connecting block 300 and causing cracking, resulting in a high assembly yield.

[0039] Along the first direction, the depth of the riveting step 310 is L, and the value of L is in the range of 0.5mm ≤ L ≤ 2mm. Along the first direction, the depth of the sub-groove 340 is h, and the value of h is in the range of 1 / 3L ≤ h ≤ 2 / 3L. By limiting the value of h to the above range, it is ensured that the sub-groove 340 will not excessively weaken the mechanical strength of the connecting block 300, thus ensuring its overall reliability. At the same time, it is easy to process and form. Otherwise, if the value of h is too large, the mechanical strength of the connecting block 300 will decrease too much, which is not conducive to its reliability in supporting the pole post 500; if the value of h is too small, there will be insufficient space for the connecting block 300 to expand, and the multiple sub-grooves 340 will not be able to reliably prevent the connecting block 300 from cracking, resulting in a decrease in the assembly yield of the cell cover plate.

[0040] This embodiment also provides a battery cell, including the aforementioned battery cell cover plate. By using the aforementioned battery cell cover plate, the multiple sub-slots 340 on the connecting block 300 can provide sufficient space for material expansion, absorbing part of the pressure when the electrode post 500 is riveted to the connecting block 300, thereby protecting the connecting block 300 and preventing it from deforming or cracking, resulting in high battery cell reliability.

[0041] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0042] Example 3 This embodiment provides a cell cover plate, which differs from the cell cover plate in Embodiment 2 in that the specific configuration of the groove structure on the connecting block 300 is different.

[0043] In this embodiment, the groove structure on the connecting block 300 includes multiple sub-grooves 340. The sub-grooves 340 are either arc-shaped or straight-lined, maintaining the shape of the riveting step 310. The multiple sub-grooves 340 are spaced apart circumferentially on the riveting step 310. The extension direction of each sub-groove 340 is parallel to the first sidewall 311 of the riveting step 310, and the sub-grooves 340 are spaced apart from the first sidewall 311. The multiple sub-grooves 340 also provide sufficient expansion space for the connecting block 300, absorbing some of the pressure during the riveting of the pole post 500 and the connecting block 300, thereby protecting the connecting block 300 and preventing deformation or cracking.

[0044] This embodiment also provides a battery cell, including the aforementioned battery cell cover plate. By using the aforementioned battery cell cover plate, the multiple sub-slots 340 on the connecting block 300 can provide sufficient space for material expansion, absorbing part of the pressure when the electrode post 500 is riveted to the connecting block 300, thereby protecting the connecting block 300 and preventing it from deforming or cracking, resulting in high battery cell reliability.

[0045] The remaining structures in this embodiment are the same as those in Embodiment 2, and will not be described again here.

[0046] 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 battery cell cover plate, characterized in that, include: A cover plate body, wherein the cover plate body is provided with a first mounting hole; A first plastic part is disposed on the side of the cover plate body away from the electrode group along a first direction, and a second mounting hole is provided on the first plastic part. A connecting block is provided on the side of the first plastic part away from the cover plate body along the first direction. The connecting block is provided with a third mounting hole. The third mounting hole is provided with a riveting step in the circumferential direction. The riveting step is provided with a countersunk platform in the circumferential direction. The bottom wall of the countersunk platform is provided with a groove structure. The riveting step and the countersunk platform are both located at the end of the connecting block away from the pole group. The second plastic part is disposed on the side of the cover plate body close to the electrode group along the first direction, and the second plastic part is provided with a fourth mounting hole. The pole post passes sequentially through the fourth mounting hole, the first mounting hole, the second mounting hole, and the third mounting hole from the side where the pole group is located along the first direction, and is then riveted to the riveting step.

2. The cell cover plate according to claim 1, characterized in that, The groove structure is an annular groove, which is continuously arranged around the circumference of the riveting step.

3. The cell cover plate according to claim 2, characterized in that, Along the second direction, the distance between the first groove sidewall of the annular groove near its center and the first platform sidewall of the riveting step is e; The value range of e is: 0.5mm ≤ e ≤ 1.5mm; Along the second direction, the distance between the second sidewall of the annular groove on the side away from its center and the second sidewall of the settling platform is b; The value of b is in the range of 0.5mm ≤ b ≤ 1.5mm.

4. The cell cover plate according to claim 2, characterized in that, Along the second direction, the width of the annular groove is t1; The value range of t1 is: 0.15mm≤t1≤0.5mm.

5. The cell cover plate according to claim 2, characterized in that, Along the first direction, the depth of the annular groove is h, and the depth of the riveting step is L; The range of h is: 1 / 3L≤h≤2 / 3L; The value of L is in the range of 0.5mm ≤ L ≤ 2mm.

6. The cell cover plate according to claim 1, characterized in that, The groove structure includes multiple sub-grooves, which are linear in shape. The multiple sub-grooves are circumferentially spaced on the riveting step. The extension direction of each sub-grooves is perpendicular to the first side wall of the riveting step, and one end of the sub-grooves extends through the first side wall, while the other end of the sub-grooves extends to the second side wall of the settling platform.

7. The cell cover plate according to claim 6, characterized in that, The width of the sub-slot is t2; The value range of t2 is: 0.15mm≤t2≤0.5mm.

8. The cell cover plate according to claim 7, characterized in that, The perimeter of the first sidewall in the cross section perpendicular to the first direction is S, and the number of the sub-slots is N; The relationship between N, S, and t2 satisfies: 0.01≤(N×t2) / S≤0.

1.

9. The cell cover plate according to claim 1, characterized in that, The groove structure includes multiple sub-grooves, which are circumferentially spaced on the riveting step. The extension direction of each sub-grooves is parallel to the first sidewall of the riveting step, and the sub-grooves are spaced apart from the first sidewall.

10. A battery cell, characterized in that, The cell cover plate included in any one of claims 1-9.

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