Cover plate assembly, battery and battery pack

Abstract

The utility model relates to battery technical field discloses the cover plate subassembly, battery and battery package, include: cover plate body, riveting piece, riveting piece is along the thickness direction and is opened riveting hole, and riveting piece forms riveting surface, pole, is provided with riveting hole and pole hole simultaneously, and pole includes first column section and second column section, and first column section rivets in riveting surface, and second column section is connected in first column section one end close to first surface, second column section has first cross section in perpendicular to the thickness direction, and first cross section is runway type structure, and the linear section of runway type structure sets up along the length direction of cover plate body, wherein, along the length direction, the length of linear section of runway type structure is d, along the thickness direction, the thickness of riveting piece is a, satisfies 2 <= d <= 2 a+0.5 , the unit of d is mm. The utility model guarantees riveting strength between pole and riveting piece while being convenient for the forming of pole and guaranteeing the flow capacity of pole, and further guarantees the reliability and safety of battery.

Description

Technical Field

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

[0002] The cover assembly is a crucial component of a battery, serving not only to encapsulate the internal structure but also to facilitate current input and output. A cover assembly typically comprises a cover body, terminals, and riveting fasteners. The terminals are deformed by riveting, thereby securing the terminals, riveting fasteners, and cover body together. However, current technologies cannot guarantee the riveting strength between the terminals and the riveting fasteners, impacting battery reliability and safety. Utility Model Content

[0003] In view of this, the present invention provides a cover plate assembly, a battery, and a battery pack to solve the problem in the prior art that the riveting strength between the terminal post and the riveting component cannot be guaranteed, which affects the reliability and safety of the battery.

[0004] In a first aspect, this utility model provides a cover plate assembly, comprising:

[0005] The cover plate body has a through-hole of pole post along the thickness direction, and the cover plate body has a first surface and a second surface that are arranged opposite to each other along the thickness direction.

[0006] A riveting component is disposed on the first surface, the riveting component having a through riveting hole along the thickness direction, and the riveting component having a riveting surface;

[0007] The pole post is simultaneously inserted into the pole post hole and the riveting hole. The pole post includes a first column segment and a second column segment. The first column segment is riveted to the riveting surface, and the second column segment is connected to the end of the first column segment near the first surface. The second column segment has a first cross section perpendicular to the thickness direction. The first cross section is a racetrack-shaped structure, and the straight segment of the racetrack-shaped structure is arranged along the length direction of the cover plate body.

[0008] Wherein, along the length direction, the length of the straight segment of the runway-shaped structure is d, and along the thickness direction, the thickness of the riveted part is a, satisfying 2≤d≤2 a+0.5 , where a is in mm and d is in mm.

[0009] Beneficial effects: While facilitating the molding of the terminals and ensuring their current carrying capacity, it also ensures the riveting strength between the terminals and the riveting components, thereby guaranteeing the reliability and safety of the battery.

[0010] In one optional embodiment, the outer contour of the first cross section includes two straight segments and two arc segments. The two straight segments are arranged at intervals relative to each other along the width direction of the cover plate body, and the two arc segments are arranged at intervals relative to each other along the length direction of the cover plate body. The two arc segments are respectively connected to the two ends of the two straight segments on the same side.

[0011] In one optional embodiment, the thickness 'a' of the riveted member satisfies 1.5mm ≤ a ≤ 4.5mm.

[0012] Beneficial effects: While ensuring the structural strength of the riveted parts and the riveting strength with the terminal posts, it avoids affecting the energy density of the battery.

[0013] In one alternative implementation, along the thickness direction, the total height of the first column segment and the second column segment is b, and the height of the first column segment is c, satisfying 1 / 5 ≤ c / b ≤ 1 / 2.

[0014] Beneficial effects: It facilitates the riveting of the pole while ensuring the riveting strength between the pole and the riveted parts.

[0015] In one optional embodiment, the thickness 'a' of the riveting member and the total height 'b' of the first column segment and the second column segment satisfy 0 ≤ ab ≤ 0.02 mm.

[0016] Beneficial effects: Prevents the terminal posts from protruding from the rivet, thus facilitating the welding of the battery to the busbar through the rivet and avoiding any impact on the battery's energy density.

[0017] In one alternative implementation, the height c of the first column segment satisfies 0.3mm ≤ c ≤ 2.25mm.

[0018] Beneficial effects: It facilitates the riveting of the pole while ensuring the riveting strength between the pole and the riveted parts.

[0019] In one optional embodiment, the riveting hole includes a first hole segment and a second hole segment connected along the thickness direction, the first hole segment is located within the first hole segment, the second hole segment is located within the second hole segment, and the connection between the first hole segment and the second hole segment forms the riveting surface.

[0020] Beneficial effects: By setting the first hole section and the second hole section, the riveting hole is formed into a stepped hole, thereby forming a riveting surface inside the riveting hole. The pole post is riveted to the inside of the first hole section through the first post section, which facilitates the welding of the battery to the busbar through the riveting parts and avoids affecting the energy density of the battery.

[0021] In one optional embodiment, the pole post further includes a third column segment and a pole post base plate. The third column segment is connected to the end of the second column segment away from the first column segment, and the pole post base plate is connected to the end of the third column segment away from the second column segment. The third column segment passes through the pole post hole, and the cover plate body is sandwiched between the riveting member and the pole post base plate.

[0022] Secondly, this utility model also provides a battery, comprising:

[0023] The housing has an opening at least at one end;

[0024] The aforementioned cover assembly is connected to the housing and seals the opening to enclose and form an accommodating space;

[0025] The battery cell is disposed within the receiving space.

[0026] Thirdly, this utility model also provides a battery pack, including the aforementioned battery. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the overall structure of a cover plate assembly according to an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 The exploded view of the cover plate assembly is shown.

[0030] Figure 3 for Figure 1 Top view of the cover plate assembly shown;

[0031] Figure 4 for Figure 3 Sectional view of the middle cover plate assembly along the AA direction

[0032] Figure 5 for Figure 4 A magnified view of part B in the diagram;

[0033] Figure 6 This is a structural schematic diagram of the first cross section of an embodiment of the present utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Cover plate body; 11. Pole post hole; 12. First surface; 13. Second surface; 2. Riveting component; 21. Riveting hole; 211. First hole section; 212. Second hole section; 22. Riveting surface; 3. Pole post; 31. First column section; 32. Second column section; 321. First cross section; 3211. Straight section; 3212. Arc section; 33. Third column section; 34. Pole post base plate; 4. Upper insulating component; 5. Lower insulating component; 6. Sealing component. Detailed Implementation

[0036] 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.

[0037] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, in one aspect, a cover plate assembly is provided, comprising:

[0039] The cover plate body 1 has a through-hole 11 along its thickness direction and has a first surface 12 and a second surface 13 arranged opposite each other along its thickness direction. A riveting member 2 is disposed on the first surface 12 and has a through-hole 21 along its thickness direction, forming a riveting surface 22. A pole post 3 passes through both the pole post hole 11 and the riveting hole 21. The pole post 3 includes a first segment 31 and a second segment 32. The first segment 31 is riveted to the riveting surface 22, and the second segment 32 is connected to the end of the first segment 31 near the first surface 12. The second segment 32 has a first cross-section 321 perpendicular to its thickness direction. The first cross-section 321 is a racetrack-shaped structure, and the straight segment 3211 of the racetrack-shaped structure is arranged along the length direction of the cover plate body 1. The length of the straight segment 3211 of the racetrack-shaped structure is d along its length direction, and the thickness of the riveting member 2 is a along its thickness direction, satisfying 2≤d≤2. a+0.5 , where a is in mm and d is in mm.

[0040] The cover plate assembly of this embodiment facilitates the forming of the terminal post 3 and ensures the current carrying capacity of the terminal post 3, while ensuring the riveting strength between the terminal post 3 and the riveting member 2, thereby ensuring the reliability and safety of the battery.

[0041] Specifically, if the value of d is too small, it will be difficult to form the terminal post 3, and the dimension of the terminal post 3 along the length direction will still be small, which will not be enough to improve the current carrying capacity of the terminal post 3. If the value of d is too large, it will cause the riveting part 2 to occupy too much space, affecting the energy density of the battery. At the same time, if the value of a is small, it will cause the two sides corresponding to the riveting part 2 and the straight segment 3211 to be prone to warping and deformation during riveting, and it will also cause the riveting strength between the riveting part 2 and the terminal post 3 to be low, affecting the reliability and safety of the battery.

[0042] It is worth noting that before riveting the pole post 3, the original shape of the first pole segment 31 (before deformation) is the same as the shape of the second pole segment 32. Riveting the original first pole segment 31 causes it to deform, so that the deformed first pole segment 31 can be riveted to the riveting surface 22 of the riveting member 2, thereby fixing the pole post 3, the riveting member 2, and the cover plate body 1.

[0043] It is worth noting that the cover plate assembly in this embodiment is applied to a blade battery. The cover plate body 1 of the blade battery has a large aspect ratio, that is, the length of the cover plate body 1 is large and the width is small. Currently, the industry has increasingly higher requirements for the charge and discharge rate of batteries, which requires an increase in the current carrying capacity of the terminal post 3, that is, an increase in the cross-sectional area of ​​the terminal post 3 in the direction perpendicular to the thickness. In the prior art, the cross-section of the terminal post 3 in the direction perpendicular to the thickness is usually circular. Since the width of the cover plate body 1 of the blade battery is small, it is not convenient to increase the diameter of the circle. Therefore, the prior art usually sets two cylindrical terminal posts 3 to increase the current carrying capacity. This setting leads to a complicated assembly process and low assembly efficiency of the cover plate assembly. In this embodiment, the dimension of the terminal post 3 along the length direction of the cover plate body 1 is increased, which can improve the current carrying capacity of the terminal post 3 without increasing the number of terminal posts 3, thus ensuring assembly efficiency.

[0044] Optionally, d can be any value from 2mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, or a value between any two of these values.

[0045] Specifically, in one embodiment, such as Figure 6 As shown, the outer contour of the first cross-section 321 includes two straight segments 3211 and two arc segments 3212. The two straight segments 3211 are spaced apart relative to each other along the width direction of the cover plate body 1, and the two arc segments 3212 are spaced apart relative to each other along the length direction of the cover plate body 1. The two arc segments 3212 are respectively connected to the two ends of the two straight segments 3211 on the same side. Thus, the first cross-section 321 forms a racetrack-shaped structure (also known as an elongated oval structure).

[0046] In one embodiment, such as Figure 5 As shown, the thickness 'a' of the riveting component 2 satisfies 1.5mm ≤ a ≤ 4.5mm. This design ensures the structural strength of the riveting component 2 and the riveting strength with the terminal post 3 while avoiding any impact on the energy density of the battery.

[0047] It is worth noting that if the value of 'a' is too small, the riveting component 2 will be too thin, resulting in weak structural strength. Furthermore, the riveting of the terminal post 3 to the riveting component 2 may easily lead to deformation or even breakage of the riveting component 2, thus affecting the riveting strength and consequently the reliability and safety of the battery. If the value of 'a' is too large, the riveting component 2 will be too thick, occupying too much space and reducing the battery's energy density.

[0048] It should be further explained that the length d of the straight segment 3211 is usually directly proportional to the thickness a of the riveting part 2; that is, the larger the value of d, the larger the value of a. Therefore, if the value of a is too large, it will also make the value of d too large, resulting in the pole post 3 being difficult to process and form.

[0049] It is worth noting that if the value of a meets the range requirement (i.e., within the range of 1.5mm to 4.5mm), but the value of d is too large, then for the pole 3, the thickness of the riveting part 2 will be too small. This will cause the two sides of the riveting part 2 and the straight segment 3211 to be prone to warping and deformation during riveting, and will also result in a lower riveting strength between the riveting part 2 and the pole 3, affecting the reliability and safety of the battery.

[0050] For example, when a = 1.5 mm, the upper limit of the value of d is 2. 1.5+0.5 =2 2 =4mm. If the value of d is greater than 4mm, it means that the length of the straight segment 3211 and the thickness of the rivet 2 are not compatible (that is, d is too large and a is too small), which will easily cause the rivet strength between the rivet 2 and the pole post 3 to be low.

[0051] Optionally, the value of 'a' can be any value among 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, and 4.5mm, or a value between any two of these values.

[0052] In one embodiment, such as Figure 5 As shown, along the thickness direction, the total height of the first column segment 31 and the second column segment 32 is b, and the height of the first column segment 31 is c, satisfying 1 / 5 ≤ c / b ≤ 1 / 2. That is, 0.2 ≤ c / b ≤ 0.5. This setting facilitates the riveting of the pole post 3 while ensuring the riveting strength between the pole post 3 and the riveting member 2.

[0053] It is worth noting that if the c / b value is too small, the height of the first column segment 31 will be too small, the electrode post 3 will be too thin, and the riveting strength between the electrode post 3 and the riveting component 2 will be low, affecting the reliability and safety of the battery. Alternatively, if the total height of the first column segment 31 and the second column segment 32 is too large, the space occupied by the electrode post 3 and the riveting component 2 will be too large, affecting the energy density of the battery. If the c / b value is too large, the height of the first column segment 31 will be too large, the electrode post 3 will be too thick, making it difficult to rivet the electrode post 3. Alternatively, if the height of the second column segment 32 is too small, the structural strength of the second column segment 32 will be insufficient, which will also result in low riveting strength between the electrode post 3 and the riveting component 2, affecting the reliability and safety of the battery.

[0054] It should be further explained that if the value of c / b is too large and the height of the second column segment 32 is too small, it will also cause the thickness of the riveting part 2 corresponding to the riveting surface 22 to be too thin, which will also lead to insufficient riveting strength.

[0055] Optionally, c / b can be any value from 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, or a value between any two values.

[0056] It is understandable that, such as Figure 5 As shown, along the thickness direction, the height of the second column segment 32 is e, which satisfies b = c + e.

[0057] In one embodiment, such as Figure 5 As shown, the thickness 'a' of the riveting component 2 and the total height 'b' of the first column segment 31 and the second column segment 32 satisfy 0 ≤ ab ≤ 0.02 mm. This design prevents the terminal post 3 from protruding from the riveting component 2, thus facilitating the welding of the battery to the busbar via the riveting component 2 and avoiding any impact on the battery's energy density.

[0058] It is worth noting that if ab < 0, the first column segment 31 will protrude from the rivet 2. When welding the rivet 2 to the busbar, the protruding first column segment 31 will interfere with the busbar, making it difficult to weld the rivet 2 to the busbar. In addition, the protruding first column segment 31 will occupy extra space, affecting the energy density of the battery. If the value of ab is too large, the rivet 2 will be too thick, occupying too much space, resulting in a decrease in the energy density of the battery. Alternatively, the total height of the first column segment 31 and the second column segment 32 will be too small, making it difficult to rivet the pole 3 and the rivet 2.

[0059] It is understandable that the values ​​of a and b are approximately equal, therefore, we can assume that 1 / 5 ≤ c / a ≤ 1 / 2.

[0060] In one embodiment, such as Figure 5As shown, the height c of the first column segment 31 satisfies 0.3mm≤c≤2.25mm. This setting facilitates the riveting of the pole post 3 while ensuring the riveting strength between the pole post 3 and the riveting member 2.

[0061] It is worth noting that if the value of c is too small, the material of the electrode post 3 will be too thin, and the riveting strength between the electrode post 3 and the riveting part 2 will be low, affecting the reliability and safety of the battery; if the value of c is too large, the material of the electrode post 3 will be too thick, making it inconvenient to rivet the electrode post 3.

[0062] Optionally, the value of c can be any one of 0.3mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.25mm, or a value between any two of these values.

[0063] In one embodiment, such as Figure 5 As shown, the riveting hole 21 includes a first hole segment 211 and a second hole segment 212 connected along the thickness direction. A first post segment 31 is located inside the first hole segment 211, and a second post segment 32 is located inside the second hole segment 212. The connection between the first hole segment 211 and the second hole segment 212 forms a riveting surface 22. By setting the first hole segment 211 and the second hole segment 212, the riveting hole 21 forms a stepped hole, thereby forming a riveting surface 22 inside the riveting hole 21. The electrode post 3 is riveted to the inside of the first hole segment 211 through the first post segment 31, which facilitates the welding of the battery to the busbar through the riveting member 2 and avoids affecting the energy density of the battery.

[0064] It is worth noting that the original first column segment 31 is riveted, causing it to deform so that the deformed first column segment 31 is located within the first hole segment 211. In this embodiment, by limiting the height c of the first column segment 31, it is possible to ensure that the pole post 3 is sufficiently riveted in the height direction, while avoiding excessive expansion of the pole post 3 during riveting, which could lead to the outward expansion and deformation of the riveted part 2 (especially for copper negative pole post 3, since copper negative pole post 3 is harder than aluminum riveted part 2, expansion of pole post 3 is more likely to cause severe deformation of riveted part 2).

[0065] In one embodiment, such as Figure 5 As shown, the pole post 3 also includes a third pole segment 33 and a pole post base plate 34. The third pole segment 33 is connected to the end of the second pole segment 32 away from the first pole segment 31, and the pole post base plate 34 is connected to the end of the third pole segment 33 away from the second pole segment 32. The third pole segment 33 passes through the pole post hole 11, and the cover plate body 1 is sandwiched between the riveting member 2 and the pole post base plate 34.

[0066] It is worth noting that, such as Figure 5As shown, the outer wall of the third column segment 33 protrudes outward from the outer wall of the second column segment 32 to form a stepped surface at the connection between the second column segment 32 and the third column segment 33, and the side of the rivet 2 facing the first surface 12 abuts against the stepped surface.

[0067] In one embodiment, such as Figures 1 to 5 As shown, the cover plate assembly also includes an upper insulating member 4, at least a portion of which is sandwiched between the side of the riveting member 2 facing the first surface 12 and the first surface 12.

[0068] In one embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the cover plate assembly also includes a lower insulating member 5, which is disposed on the second surface 13.

[0069] Furthermore, a portion of the lower insulating member 5 extends between the second surface 13 and the side of the pole base plate 34 facing the second surface 13.

[0070] In one embodiment, such as Figure 2 and Figure 5 As shown, the cover plate assembly also includes a sealing element 6, which is disposed around the third column segment 33 and inserted into the pole post hole 11 so that the sealing element 6 seals between the pole post 3 and the cover plate body 1.

[0071] The following observations examine the riveting of pole posts 3 with different sizes. The assembly results of pole posts 3 in the embodiment and pole posts 3 in the comparative example are shown in Table 1. In the embodiment, pole post 3 refers to pole post 3 that meets the requirements of this embodiment, while pole post 3 in the comparative example does not meet the requirements of this embodiment.

[0072] Table 1. Assembly details of pole post 3 in the embodiment and pole post 3 in the comparative example.

[0073]

[0074] As can be seen from Table 1, in Examples 1 to 10, the value of 'a' satisfies 1.5mm ≤ a ≤ 4.5mm, and the value of 'd' satisfies 2 ≤ d ≤ 2. a+0.5 The value of c satisfies 1 / 5≤c / a≤1 / 2. Therefore, in Examples 1 to 10, when the pole post 3 and the riveting part 2 are riveted, the straight segment 3211 will not have material expansion or material shortage, and the straight segment 3211 has sufficient strength to prevent edge collapse; the riveting strength is sufficient, and the riveting part 2 does not break.

[0075] As can be seen from Table 1, in Comparative Example 1 and Comparative Example 2, the value of a is less than 1.5 mm, the riveting part 2 is too thin, the structural strength of the riveting part 2 itself is weak, and the riveting of the pole post 3 and the riveting part 2 is prone to deformation or even breakage. In addition, the riveting strength is insufficient, and when the riveting part 2 is welded to the busbar, it will melt through, causing the upper insulating part 4 to melt.

[0076] As can be seen from Table 1, in Comparative Example 3 and Comparative Example 4, the value of a is greater than 4.5 mm, which leads to an excessively large value of d, making it difficult to form the pole post 3.

[0077] As can be seen from Table 1, in Comparative Examples 5 and 6, the value of c is less than 1 / 5a, which results in the riveting height (the height of the first column segment 31) being too small relative to the thickness of the riveted part 2, the material of the pole post 3 being too thin, and the riveting strength being insufficient.

[0078] As can be seen from Table 1, in Comparative Examples 7 and 8, the value of c is greater than 1 / 2a, which results in the riveting height (the height of the first column segment 31) being too large relative to the thickness of the riveted part 2, and the thickness of the part of the riveted part 2 corresponding to the riveting surface 22 being too thin, resulting in insufficient riveting strength.

[0079] As can be seen from Table 1, in Comparative Examples 9 and 10, the value of d is less than 2 mm, which results in the length of the straight segment 3211 being too small, making it difficult to form the pole post 3.

[0080] As can be seen from Table 1, in Comparative Examples 11 and 12, the value of d is greater than 2. a+0.5 This causes the two sides of the riveted part 2 corresponding to the straight segment 3211 to be prone to warping and deformation during riveting, and the riveting strength is insufficient.

[0081] According to an embodiment of the present invention, another aspect provides a battery comprising:

[0082] The housing has an opening at least at one end;

[0083] The aforementioned cover assembly connects to the housing and seals the opening to enclose and form an accommodating space;

[0084] The battery cell is housed within the containment space.

[0085] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, including the battery described above.

[0086] 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 cover plate assembly, characterized in that, include: The cover plate body has a through-hole of pole post along the thickness direction, and the cover plate body has a first surface and a second surface that are arranged opposite to each other along the thickness direction. A riveting component is disposed on the first surface, the riveting component having a through riveting hole along the thickness direction, and the riveting component having a riveting surface; The pole post is simultaneously inserted into the pole post hole and the riveting hole. The pole post includes a first column segment and a second column segment. The first column segment is riveted to the riveting surface, and the second column segment is connected to the end of the first column segment near the first surface. The second column segment has a first cross section perpendicular to the thickness direction. The first cross section is a racetrack-shaped structure, and the straight segment of the racetrack-shaped structure is arranged along the length direction of the cover plate body. Wherein, along the length direction, the length of the straight segment of the runway-shaped structure is d, and along the thickness direction, the thickness of the riveted part is a, satisfying 2≤d≤2 a+0.5 , where a is in mm and d is in mm.

2. The cover plate assembly according to claim 1, characterized in that, The outer contour of the first cross section includes two straight segments and two circular arc segments. The two straight segments are arranged at intervals relative to each other along the width direction of the cover plate body, and the two circular arc segments are arranged at intervals relative to each other along the length direction of the cover plate body. The two circular arc segments are respectively connected to the two ends of the two straight segments on the same side.

3. The cover plate assembly according to claim 1 or 2, characterized in that, The thickness 'a' of the riveted component satisfies 1.5mm ≤ a ≤ 4.5mm.

4. The cover plate assembly according to claim 1 or 2, characterized in that, Along the thickness direction, the total height of the first column segment and the second column segment is b, and the height of the first column segment is c, satisfying 1 / 5≤c / b≤1 / 2.

5. The cover plate assembly according to claim 4, characterized in that, The thickness 'a' of the riveted component and the total height 'b' of the first and second column segments satisfy 0 ≤ ab ≤ 0.02 mm.

6. The cover plate assembly according to claim 4, characterized in that, The height c of the first column segment satisfies 0.3mm≤c≤2.25mm.

7. The cover plate assembly according to claim 1 or 2, characterized in that, The riveting hole includes a first hole segment and a second hole segment connected along the thickness direction. The first hole segment is located inside the first hole segment, and the second hole segment is located inside the second hole segment. The connection between the first hole segment and the second hole segment forms the riveting surface.

8. The cover plate assembly according to claim 1 or 2, characterized in that, The pole post further includes a third column segment and a pole post base plate. The third column segment is connected to the end of the second column segment away from the first column segment. The pole post base plate is connected to the end of the third column segment away from the second column segment. The third column segment passes through the pole post hole. The cover plate body is sandwiched between the riveting member and the pole post base plate.

9. A battery, characterized in that, include: The housing has an opening at least at one end; The cover plate assembly according to any one of claims 1 to 8 is connected to the housing and seals the opening to enclose and form a receiving space; The battery cell is disposed within the receiving space.

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

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