Riveting block, cover plate assembly and battery cell

Abstract

The utility model relates to battery technical field discloses riveting block, cover plate subassembly and electric core, riveting block includes: riveting area and thinning area, is provided with riveting hole in riveting area, and thinning area is connected with riveting area, and the quantity of thinning area is two, two thinning areas are along X direction and are arranged on the both sides of riveting area, along X direction, from the place where thinning area and riveting area are connected to the end where thinning area is away from riveting area, the thickness of thinning area along Z direction gradually reduces. The thickness of the part area of riveting block along the length direction close to both ends is thinned, the thickness of riveting block gradually reduces from riveting area to both ends, can offset the height of both ends of riveting block because of riveting and warping, make riveting block after riveting the overall flatness of the plane meets the requirement, and the height of both ends of riveting block along the length direction also will not exceed the upper limit, avoid the problem that riveting block appears after riveting the flatness is bad and height is out of tolerance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a riveting block, a cover plate assembly, and a battery cell. Background Technology

[0002] For riveted cover plate assemblies, which are formed by riveting together cover plate body, poles, riveting blocks, upper plastic and lower plastic components, a large riveting force is applied to the poles during the riveting process to ensure sufficient material expansion. This can cause the ends of the riveting blocks to warp. However, when the ends of the riveting blocks warp, the following problems occur: poor flatness of the riveting blocks can easily lead to incomplete welding of the tabs on the riveting blocks, affecting the welding yield; the overall height of the cover plate assembly is too large, exceeding the height tolerance, which can result in height deviations in the finished battery cells, affecting module assembly. Utility Model Content

[0003] In view of this, the present invention provides a riveting block, a cover plate assembly and a battery cell to solve the problem of poor flatness and excessive height of the riveting block caused by the warping of both ends of the riveting block.

[0004] In a first aspect, the present invention provides a riveting block, comprising: a riveting area and a thinning area, wherein a riveting hole is provided in the riveting area, the thinning area is connected to the riveting area, and there are two thinning areas, which are respectively disposed on both sides of the riveting area along the X direction; along the X direction, from the point where the thinning area is connected to the riveting area to the end of the thinning area away from the riveting area, the thickness of the thinning area gradually decreases along the Z direction.

[0005] Beneficial effects: By designating the middle section of the riveting block along its length as the riveting zone, and setting thinning zones along the length of the riveting block on both sides of the riveting zone to the ends of the riveting block, the thickness of each thinning zone gradually decreases as it moves away from the riveting zone. This effectively reduces the thickness of the area near the ends of the riveting block along its length, and the thickness of the riveting block gradually decreases from the riveting zone towards the ends. This counteracts the warping height at the ends of the riveting block caused by riveting, ensuring that the overall flatness of the riveting block meets the requirements after riveting, and that the height at both ends of the riveting block does not exceed the upper limit. This avoids problems of poor flatness and height deviation after riveting. Therefore, it effectively prevents problems of poor flatness and height deviation in the cover plate assembly after riveting.

[0006] In one alternative embodiment, the upper surface of the thinning region along the Z direction is an inclined plane.

[0007] Beneficial effects: By setting the upper surface of the thinning zone along the Z direction as an inclined plane, the thickness of the rivet block gradually decreases from the riveting zone to both ends, that is, the thickness of the rivet block gradually decreases in the thinning zone. In addition, the inclined plane makes the upper surface of the thinning zone transition smoothly, which can reduce stress concentration problems, facilitate processing, and facilitate subsequent welding of the rivet block and the plate.

[0008] In one alternative embodiment, along the X direction, the size of the riveting area is larger than the size of the riveting hole, and the distance between the thinning area and the riveting hole is W1, where W1 ≥ 3 mm.

[0009] Beneficial effects: By setting a thinning zone on the rivet block at least 3 mm away from the rivet hole along the X direction, the thickness can be gradually reduced to meet the flatness requirements of the rivet block after riveting, and the structural strength of the rivet block can be improved as much as possible, ensuring the reliability of the rivet block.

[0010] In one alternative implementation, each of the thinning regions has a dimension of W2 along the X direction, where W2 ≥ 5 mm.

[0011] Beneficial effects: It ensures that the thinning zone has sufficient distance along the X direction, so that the two ends of the rivet block can be thinned sufficiently, thereby effectively offsetting the problem of the two ends of the rivet block lifting after riveting, ensuring the flatness of the rivet block, and avoiding the height deviation of the rivet block along the Z direction after riveting, thus ensuring the pass rate of the cover plate assembly and the battery cell.

[0012] In one optional embodiment, the thickness along the Z direction at the junction of the thinning region and the riveting region is h0, and the thickness along the Z direction at the end of the thinning region away from the riveting region is h1, wherein 0.1 mm ≤ h0 - h1 ≤ 0.3 mm.

[0013] Beneficial effects: It can effectively counteract the warping of both ends of the rivet block and ensure the structural strength of the rivet block.

[0014] In one optional embodiment, the thickness h0 at the junction of the thinning area and the riveting area along the Z direction ranges from 2.5 mm to 3 mm.

[0015] Beneficial effects: It can ensure that the rivet block has sufficient structural strength, thereby ensuring the reliability and safety of the rivet block, and can also avoid material waste and excessive weight, which is conducive to improving the energy density of the battery cell.

[0016] In one optional embodiment, the dimension of the riveting block along the X direction is W0, wherein the value of W0 is in the range of 30 mm ≤ W0 ≤ 50 mm.

[0017] Beneficial effects: It can ensure that the riveting block has sufficient riveting strength and provide sufficient welding area for the battery cell, ensuring that the battery cell has good current carrying capacity. At the same time, it can effectively avoid material waste, reduce costs, reduce weight, and thus improve the energy density of the battery cell.

[0018] Secondly, this utility model also provides a cover plate assembly, comprising: a cover plate body having a pole post hole; the aforementioned riveting block having a riveting hole corresponding to the pole post hole; a first plastic part having at least a portion located between the riveting block and the cover plate body, the first plastic part having a first through hole corresponding to the pole post hole; a second plastic part having a second through hole corresponding to the pole post hole on the side of the cover plate body away from the riveting block; and a pole post comprising a plate and a column, the plate being disposed on the side of the second plastic part away from the cover plate body, the column passing sequentially through the second through hole, the pole post hole, the first through hole, and the riveting hole. Since the cover plate assembly includes a riveting block and has the same effect as the riveting block, it will not be described further here.

[0019] In one optional embodiment, the first plastic part includes: a plastic part body and an extension portion, the plastic part body being located between the rivet block and the cover plate body, the extension portion being connected around the circumferential edge of the plastic part body and extending along the Z direction, the extension portion being disposed around the outer periphery of the rivet block; after the cover plate assembly is assembled, the distance between the upper surfaces of the two ends of the rivet block along the X direction and the upper surface of the plastic part body is h11, the thickness of the plastic part body along the Z direction is h2, and the total thickness of the first plastic part along the Z direction is H, wherein h11, h2 and H satisfy the relationship: h11+h2≥H.

[0020] Beneficial effects: By setting the first plastic part to include a plastic body located between the rivet block and the cover plate body, and an extension surrounding the outer periphery of the rivet block, the insulation between the rivet block and the cover plate body can be fully guaranteed. At the same time, by limiting the distance h11 between the upper surfaces of the two ends of the rivet block along the X direction and the upper surface of the plastic body, the thickness h2 of the plastic body along the Z direction, and the total thickness H of the first plastic part along the Z direction to satisfy the relationship h11+h2≥H, the lowest point of the upper surface of the rivet block is not lower than the upper surface of the first plastic part, thereby ensuring that the rivet block protrudes from the first plastic part as a whole, which facilitates the welding of the upper surface of the rivet block to the ferrule and ensures the welding yield of the ferrule.

[0021] Thirdly, this utility model also provides a battery cell, comprising: a housing having an open end; an electrode assembly disposed within the inner cavity of the housing; and the aforementioned cover plate assembly, the cover plate assembly covering the open end of the housing. Since the battery cell includes the cover plate assembly and has the same effect as the cover plate assembly, it will not be described in detail here. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0023] Figure 1 This is a schematic diagram of the structure of a riveting block according to an embodiment of the present utility model; Figure 2 for Figure 1 A top view of the riveted block shown; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 This is an exploded view of a cover plate assembly according to an embodiment of the present utility model; Figure 5 for Figure 4 The front view of the cover plate assembly shown; Figure 6 This is a front view of a cover plate assembly after assembly according to an embodiment of the present utility model; Figure 7 for Figure 6 Top view of the cover plate assembly shown; Figure 8 for Figure 7 Cross-sectional view along the BB direction; Figure 9 for Figure 8 A magnified view of part of C; Figure 10 This is a schematic diagram of the structure of a first plastic part according to an embodiment of the present utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Riveting block; 11. Riveting area; 111. Riveting hole; 12. Thinning area; 2. Cover plate body; 21. Pole post hole; 3. First plastic part; 31. Plastic part body; 311. First through hole; 32. Extension; 4. Pole post; 41. Plate body; 42. Post body; 5. Second plastic part; 51. Second through hole; 6. Explosion-proof valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] The cover plate assembly is a crucial component of the battery cell. For riveted cover plate assemblies, they are formed by riveting together the cover plate body, terminals, riveting blocks, upper plastic parts, and lower plastic parts. They are typically categorized as single-terminal or dual-terminal based on the current flow characteristics of the terminals. During the riveting process of a single-terminal cover plate, excessive pressure may be applied to ensure sufficient material expansion of the terminal, leading to warping at both ends of the riveting block. When the ends of the riveting block warp, the following problems arise: poor flatness of the riveting block, easily causing incomplete soldering of the welding plates on the riveting block, affecting the welding yield; and the overall height of the cover plate assembly is too large, resulting in height deviations in the finished battery cell, impacting module assembly.

[0027] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, in one aspect, a riveting block is provided, such as... Figures 1 to 3 As shown, the riveting block 1 includes a riveting area 11 and a thinning area 12. The riveting area 11 has a riveting hole 111. The thinning area 12 is connected to the riveting area 11, and there are two thinning areas 12, which are located on opposite sides of the riveting area 11 along the X direction. Along the X direction, from the point where the thinning area 12 connects to the riveting area 11 to the end of the thinning area 12 away from the riveting area 11, the thickness of the thinning area 12 gradually decreases along the Z direction. Here, the Z direction refers to... Figure 1 and Figure 3 The direction indicated by the middle arrow "Z" is the thickness direction of rivet block 1; the X direction refers to... Figures 1 to 3 The direction indicated by the middle arrow "X" is perpendicular to the Z direction, and the X direction is the length direction of the rivet block 1.

[0029] In this embodiment, the riveting block 1 has a riveting area 11 located at its midpoint along its length. Thinning areas 12 are defined on both sides of the riveting area 11 and between the two ends of the riveting block 1. For each thinning area 12, the thickness gradually decreases as it moves away from the riveting area 11. This thinning reduces the thickness of the portion of the riveting block 1 near both ends along its length, and the thickness gradually decreases from the riveting area 11 towards both ends. This effectively counteracts the warping caused by riveting at both ends of the riveting block 1, ensuring the overall flatness of the riveting block 1 meets requirements and that the height at both ends does not exceed the upper limit. This avoids problems with flatness and height deviation after riveting. Consequently, it effectively prevents flatness and height deviation issues in the cover plate assembly after riveting. Here, height refers to the dimension along the Z-direction.

[0030] It should be noted that the riveting block 1 has two perpendicular X, Y, and Z directions, such as... Figures 1 to 3 As shown, the X, Y, and Z directions form a rectangular coordinate system.

[0031] It should be noted that, along the X direction, the area between the two sides of the riveting area 11 and the two ends of the riveting block 1 is set as the thinning area 12, and the end of the thinning area 12 away from the riveting area 11 is the end of the riveting block 1 along the X direction.

[0032] In one embodiment, the rivet hole 111 is centered on the rivet block 1 along the X direction.

[0033] In one embodiment, the upper surface of the thinning region 12 along the Z direction is an inclined surface. It should be noted that the riveting block 1 has two surfaces, an upper and a lower surface, arranged opposite each other along the Z direction. When the riveting block 1 is assembled into the cover plate assembly, the upper surface of the riveting block 1 is the surface of the riveting block 1 facing away from the cover plate body 2 along the Z direction, and the lower surface is the surface of the riveting block 1 facing the cover plate body 2 along the Z direction. Before the riveting block 1 is riveted, the lower surface of the thinning region 12 is flush with the lower surface of the riveting region 11 and lies in the XY plane. The intersection line between the inclined surface of the thinning region 12 and the riveting region 11 is the first intersection line, and the intersection line between the inclined surface and the two ends of the riveting block 1 along the X direction is the second intersection line. The first intersection line is higher than the second intersection line. That is, the thickness of the rivet block corresponding to the intersection of the inclined surface of the upper surface of the thinning area 12 and the riveting area 11 is greater than the thickness of the rivet block corresponding to the end of the thinning area 12 away from the riveting area 11. Therefore, by setting the upper surface of the thinning area 12 along the Z direction as an inclined surface, the thickness of the rivet block 1 gradually decreases from the riveting area 11 to both ends. That is, the thickness of the rivet block 1 gradually decreases in the thinning area 12. Moreover, the inclined surface makes the upper surface of the thinning area 12 transition smoothly, which can reduce stress concentration problems, facilitate processing, and facilitate subsequent welding of the rivet block 1 to the plate.

[0034] In one embodiment, further combination Figure 2 As shown, along the X direction, the size of the riveting area 11 is larger than the size of the riveting hole 111, and the distance between the thinning area 12 and the riveting hole 111 is W1, where W1 ≥ 3 mm. It should be noted that the riveting area 11 is the riveting region on the riveting block 1. Since there is no warping at the riveting point, the thickness of the riveting block 1 near the riveting hole 111 does not need to be reduced. It has been verified that the riveting block 1 begins to warp 3 mm away from the riveting hole 111 along the X direction after riveting. If W1 is less than 3 mm, the edge of the riveting area 11 along the X direction is too close to the riveting hole 111, that is, the thinning area 12 along the X direction is too close to the riveting hole 111. The thinning area on the riveting block 1 is too large, causing unnecessary thinning near the middle position of the riveting block 1 along the X direction, affecting the overall structural strength of the riveting block 1. Therefore, by limiting W1 to be greater than or equal to 3 mm, a thinning zone 12 is set on the riveting block 1 at a distance of at least 3 mm from the riveting hole 111 along the X direction, and the thickness is gradually reduced to meet the flatness requirements of the riveting block 1 after riveting, and the structural strength of the riveting block 1 can be improved as much as possible to ensure the reliability of the riveting block 1.

[0035] In one embodiment, further combination Figure 2 As shown, the dimension of each thinning zone 12 along the X direction is W2, where W2 ≥ 5 mm. If W2 is less than 5 mm, the dimension of the thinning zone 12 along the X direction is too small, and the area for thickness reduction at both ends of the riveting block 1 is too small. This cannot effectively offset the warping at both ends of the riveting block 1 after riveting, and will still result in the flatness of the riveting block 1 not meeting the requirements, as well as excessive warping at both ends of the riveting block 1 along the X direction. Therefore, by limiting W2 to be greater than or equal to 5 mm, a sufficient dimension is ensured for the thinning zone 12 along the X direction, allowing for sufficient thinning at both ends of the riveting block 1. This effectively offsets the warping problem at both ends of the riveting block 1 after riveting, ensures the flatness of the riveting block 1, and avoids excessive height deviation of the riveting block 1 along the Z direction after riveting, thereby ensuring the pass rate of the cover plate assembly and the battery cell.

[0036] In one embodiment, the dimension of the riveting block 1 along the X direction is W0, where the value of W0 ranges from 30 mm to 50 mm. It should be noted that the riveting block 1 is used to rivet the terminal post 4 and weld it to the busbar (i.e., the current-carrying plate), through which the current from the battery cell is led out to external devices. If W0 is less than 30 mm, the dimension of the riveting block 1 along the X direction is too small, resulting in insufficient riveting strength and insufficient welding area for the busbar, leading to insufficient current carrying capacity of the battery cell. If W0 is greater than 50 mm, the dimension of the riveting block 1 along the X direction is too large, causing material waste, increased cost, and excessive weight, which is detrimental to improving the energy density of the battery cell. Therefore, by limiting W0 to the range of 30 mm to 50 mm, it is possible to ensure that the riveting block 1 has sufficient riveting strength and provides sufficient welding area for the busbar, ensuring good current carrying capacity of the battery cell, while effectively avoiding material waste, reducing costs, and lightening weight, thereby improving the energy density of the battery cell.

[0037] Optionally, the value of W0 is any one of 30 mm, 32 mm, 35 mm, 37 mm, 40 mm, 42 mm, 45 mm, 48 mm, 50 mm, or a value between any two of these values.

[0038] In one embodiment, further combination Figure 3 As shown, the thickness along the Z direction at the connection between the thinning region 12 and the riveting region 11 is h0, and the thickness along the Z direction at the end of the thinning region 12 away from the riveting region 11 is h1, wherein 0.1 mm ≤ h0 - h1 ≤ 0.3 mm. It should be noted that the thickness h0 along the Z direction at the connection between the thinning area 12 and the riveting area 11 is the maximum thickness of the thinning area 12, which is equal to the thickness of the riveting area 11; the thickness h1 along the Z direction at the end of the thinning area 12 away from the riveting area 11 is the minimum thickness of the thinning area 12. If h0-h1 is less than 0.1 mm, the difference between the maximum and minimum thickness of the thinning area 12 is too small, the upper surface of the thinning area 12 is too flat, and the reduction in size along the Z direction at both ends of the riveting block 1 in the X direction is too small, which cannot effectively prevent the warping at both ends of the riveting block 1. If h0-h1 is greater than 0.3 mm, the difference between the maximum and minimum thickness of the thinning area 12 is too large, the upper surface of the thinning area 12 is too steep, and the reduction in size along the Z direction at both ends of the riveting block 1 in the X direction is too large, which will weaken the overall structural strength of the riveting block 1 and affect its reliability. Therefore, by limiting the difference between the maximum and minimum thickness of the thinning zone 12 to a range of 0.1 mm to 0.3 mm, it is possible to effectively counteract the warping at both ends of the rivet block 1 while ensuring the structural strength of the rivet block 1.

[0039] Optionally, the values ​​of h0-h1 are any one of 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, and 0.3 mm, or a value between any two of them.

[0040] In one embodiment, the thickness h0 along the Z-direction at the connection between the thinning region 12 and the riveting region 11 is in the range of 2.5 mm ≤ h0 ≤ 3 mm. It should be noted that h0 is the size of the riveting block 1 before thinning, equal to the thickness of the riveting region 11 along the Z-direction. If h0 is less than 2.5 mm, the riveting block 1 is too thin, resulting in insufficient structural strength and making it prone to damage during riveting. If h0 is greater than 3 mm, the thickness and weight of the riveting block 1 are too large, which is detrimental to improving the energy density of the battery cell, wastes materials, and increases costs. Therefore, by limiting h0 to the range of 2.5 mm to 3 mm, sufficient structural strength of the riveting block 1 can be ensured, thereby guaranteeing its reliability and safety, while also avoiding material waste and excessive weight, which is beneficial for improving the energy density of the battery cell.

[0041] Optionally, the value of h0 is any one of 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, or a value between any two of these values.

[0042] The riveting block in this embodiment includes a riveting area 11 and a thinning area 12 connected to both ends of the riveting area 11. The portion of the riveting block 1 at both ends along the X direction is thinned, and the thickness of the riveting block gradually decreases from the middle to both ends along the X direction, so as to avoid problems such as poor flatness and excessive height of the riveting block 1 after riveting.

[0043] According to an embodiment of the present invention, another aspect also provides a cover plate assembly, such as... Figures 4 to 10 As shown, the cover plate assembly includes: a cover plate body 2, the aforementioned riveting block 1, a first plastic part 3, a second plastic part 5, and an electrode post 4. The cover plate body 2 has an electrode post hole 21; the riveting hole 111 on the riveting block 1 corresponds to the electrode post hole 21; at least a portion of the first plastic part 3 is located between the riveting block and the cover plate body 2 to ensure insulation between the riveting block 1 and the cover plate body 2, and the first plastic part 3 has a first through hole 311 corresponding to the electrode post hole; the second plastic part 5 is located on the side of the cover plate body 2 away from the riveting block 1 to ensure insulation between the electrode assembly body and the cover plate body 2, and the second plastic part 5 has a second through hole 51 corresponding to the electrode post hole 21; the electrode post 4 includes a plate 41 and a post 42, the plate 41 being located on the side of the second plastic part 5 away from the cover plate body 2, and the post 42 passing sequentially through the second through hole 51, the electrode post hole 21, the first through hole 311, and the riveting hole 111.

[0044] It should be noted that the pole post hole 21 is a through hole that penetrates the cover plate body 2 along the Z direction, the riveting hole 111 is a through hole that penetrates the riveting block 1 along the Z direction, and the first through hole 311 is a through hole that penetrates the first plastic part 3 along the Z direction. During the assembly of the cover plate assembly, the pole post 42 is passed through the second through hole 51, the pole post hole 21, the first through hole 311 and the riveting hole 111 in sequence along the Z direction from bottom to top, and then the pole post 4 is riveted to the riveting block 1, thereby realizing the relative fixation of the cover plate body 2, the riveting block 1, the first plastic part 3, the second plastic part 5 and the pole post 4, and realizing the riveting of the cover plate assembly.

[0045] In one embodiment, further combination Figures 8 to 10 As shown, the first plastic part 3 includes: a plastic part body 31 and an extension 32. The plastic part body 31 is located between the rivet block and the cover plate body 2. The extension 32 is connected around the circumferential edge of the plastic part body 31 and extends upward along the Z direction. The extension 32 is disposed around the outer periphery of the rivet block. After the cover plate assembly is assembled, the distance between the upper surfaces of the two ends of the rivet block along the X direction and the upper surface of the plastic part body 31 is h11. The thickness of the plastic part body 31 along the Z direction is h2. The total thickness of the first plastic part 3 along the Z direction is H. h11, h2, and H satisfy the relationship: h11 + h2 ≥ H. Here, the X direction refers to... Figures 4 to 10 The direction indicated by the middle arrow ("X") is the direction of the Z direction. Figures 4 to 6 , Figures 8 to 10 The direction of the "Z" indicated by the middle arrow.

[0046] It should be noted that "after the cover plate assembly is assembled" refers to the cover plate assembly after riveting; h11 is the distance from the upper surface of the two ends of the riveting block 1 to the upper surface of the plastic body 31 after the two ends of the riveting block 1 are raised along the X direction after riveting. The thickness of the riveting block 1 is different before and after riveting. The upper surface refers to the upper surface along the Z direction, that is, the upper surface of the riveting block is the surface of the riveting block away from the cover plate body 2 along the Z direction, and the upper surface of the plastic body 31 is the surface of the plastic body 31 away from the cover plate body 2 along the Z direction; the total thickness H of the first plastic part 3 along the Z direction refers to the sum of the thickness h2 of the plastic body 31 along the Z direction and the dimension of the extension 32 along the Z direction.

[0047] It should also be noted that the two ends of the rivet block along the X direction are the lowest points on the rivet block 1, and h11+h2 is the distance along the Z direction between the lowest point of the rivet block 1 and the lower surface of the first plastic part 3. If h11+h2 is less than H, then the two ends of the rivet block 1 along the X direction are lower than the upper surface of the extension 32. Since the upper surface of the rivet block 1 needs to be welded with a plate, it will cause interference between the extension 32 and the plate, making welding inconvenient.

[0048] Therefore, by setting the first plastic part 3 to include a plastic part body 31 located between the rivet block and the cover plate body 2, and an extension 32 surrounding the outer periphery of the rivet block 1, the insulation between the rivet block 1 and the cover plate body 2 can be fully guaranteed. At the same time, by limiting the distance h11 between the upper surfaces of the two ends of the rivet block 1 along the X direction and the upper surface of the plastic part body 31, the thickness h2 of the plastic part body 31 along the Z direction, and the total thickness H of the first plastic part 3 along the Z direction to satisfy the relationship h11+h2≥H, the lowest point of the upper surface of the rivet block 1 is not lower than the upper surface of the first plastic part 3, thereby ensuring that the rivet block 1 protrudes from the first plastic part 3 as a whole, which facilitates the welding of the upper surface of the rivet block 1 to the plate and ensures the welding yield of the plate.

[0049] In one embodiment, the first plastic part 3 is the upper plastic part, and the second plastic part 5 is the lower plastic part.

[0050] In one embodiment, the cover plate body 2 is also provided with an explosion-proof valve hole, which is spaced apart from the pole hole. The cover plate assembly also includes an explosion-proof valve 6, which is installed in the explosion-proof valve hole. The explosion-proof valve is adapted to open when the gas pressure inside the cell reaches a preset value, so as to discharge the high-pressure gas inside the cell and improve the safety of the cell.

[0051] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing, an electrode assembly, and the aforementioned cover plate assembly. The housing has an open end; the electrode assembly is disposed within the inner cavity of the housing; the cover plate assembly covers the open end of the housing to close the open end of the housing. Optionally, the battery cell is a lithium-ion battery cell.

[0052] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A riveting block, characterized in that, include: The riveting area and the thinning area are provided. The riveting area has a riveting hole. The thinning area is connected to the riveting area. There are two thinning areas. The two thinning areas are respectively located on both sides of the riveting area along the X direction. Along the X direction, from the point where the thinning area connects to the riveting area to the end of the thinning area away from the riveting area, the thickness of the thinning area gradually decreases along the Z direction.

2. The riveting block according to claim 1, characterized in that, The upper surface of the thinning zone along the Z direction is an inclined surface.

3. The riveting block according to claim 1, characterized in that, Along the X direction, the size of the riveting area is larger than the size of the riveting hole, and the distance between the thinning area and the riveting hole is W1, where W1 ≥ 3 mm.

4. The riveting block according to claim 1, characterized in that, Each of the thinning regions has a dimension of W2 along the X direction, where W2 ≥ 5 mm.

5. The riveting block according to claim 1, characterized in that, The thickness along the Z direction at the junction of the thinning zone and the riveting zone is h0, and the thickness along the Z direction at the end of the thinning zone away from the riveting zone is h1, wherein 0.1 mm ≤ h0 - h1 ≤ 0.3 mm.

6. The riveting block according to claim 5, characterized in that, The thickness h0 at the junction of the thinning zone and the riveting zone along the Z direction has a range of 2.5 mm ≤ h0 ≤ 3 mm.

7. The riveting block according to any one of claims 1 to 6, characterized in that, The dimension of the rivet block along the X direction is W0, where the value of W0 is in the range of 30 mm ≤ W0 ≤ 50 mm.

8. A cover plate assembly, characterized in that, include: The cover plate body has pole hole; The riveting block according to any one of claims 1 to 7, wherein the riveting hole on the riveting block is provided corresponding to the pole hole; A first plastic part, at least a portion of which is located between the riveting block and the cover plate body, and a first through hole corresponding to the pole hole is provided on the first plastic part; The second plastic part is disposed on the side of the cover plate body away from the rivet block, and the second plastic part is provided with a second through hole corresponding to the pole hole. The pole includes a plate and a column. The plate is disposed on the side of the second plastic part away from the cover plate body. The column passes through the second through hole, the pole hole, the first through hole and the riveting hole in sequence.

9. The cover plate assembly according to claim 8, characterized in that, The first plastic part includes: a plastic part body and an extension, wherein the plastic part body is located between the rivet block and the cover plate body, the extension is connected around the circumferential edge of the plastic part body, and the extension extends along the Z direction, and the extension is disposed around the outer peripheral side of the rivet block; After the cover plate assembly is assembled, the distance between the upper surfaces of the two ends of the rivet block along the X direction and the upper surface of the plastic body is h11, the thickness of the plastic body along the Z direction is h2, and the total thickness of the first plastic part along the Z direction is H. The relationship between h11, h2 and H is: h11+h2≥H.

10. A battery cell, characterized in that, include: The shell has an open end; The electrode assembly is disposed within the inner cavity of the housing; The cover assembly of claim 9, wherein the cover assembly covers the opening end of the housing.

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