Cover plate assembly, battery and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a cover plate assembly, a battery and a battery pack. The polar column is provided with a first column section, the first column section is provided with a first cross section, and the first cross section is of a runway-shaped structure; a mounting hole is formed in the sealing ring in the thickness direction of the cover plate assembly in a penetrating mode, the sealing ring surrounds the mounting hole in the direction perpendicular to the thickness direction of the cover plate assembly to form a first opening contour, and the first opening contour is also of a runway-shaped structure; wherein the minimum distance between the arc section of the first cross section and the arc section of the first open pore outline is a, the distance between the linear section of the first cross section and the linear section of the first open pore outline is b, and b-a is larger than or equal to 0.02 mm and smaller than or equal to 0.1 mm. According to the cover plate assembly, the influence of material expansion at the straight line section of the pole on the cover plate body is reduced, the situation that the cover plate body protrudes outwards due to excessive material expansion of the cover plate body is avoided, and therefore the width consistency of the cover plate body is guaranteed, and the assembly effect of the cover plate assembly and the shell is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a cover plate assembly, a battery, and a battery pack. Background Art

[0002] The cover assembly usually includes a battery cover, a pole and a rivet. The pole is deformed by riveting, so that the pole, the rivet and the cover body are fixed by riveting. In addition, during the installation of the pole, in order to prevent the battery from leaking at the pole hole, the pole installation location needs to be sealed. In the prior art, a sealing ring is usually sleeved on the outer periphery of the pole. After the battery cover, the pole and the sealing ring are assembled, the sealing ring is squeezed and set between the battery cover and the pole to achieve sealing at the pole hole. However, when the pole is deformed by riveting, if there are different degrees of expansion along the circumferential direction, it will cause different degrees of squeezing on the sealing ring, which will cause the battery cover to expand, thereby increasing the width of the battery cover, resulting in poor width consistency of the battery cover, and affecting the assembly effect of the battery cover and the shell. Summary of the Invention

[0003] In view of this, the present invention provides a cover plate assembly, a battery, and a battery pack to solve the problem of poor width consistency of battery cover plates in the prior art.

[0004] In the first aspect, the present invention provides a cover assembly, comprising: a cover body, having a pole hole opened along the thickness direction of the cover assembly; a pole, passing through the pole hole and having a first column segment, the first column segment having a first cross-section in a direction perpendicular to the thickness direction of the cover assembly, the first cross-section being a runway-shaped structure; a sealing ring, having a mounting hole passing through along the thickness direction of the cover assembly, the first column segment being inserted into the mounting hole, the sealing ring forming a first opening profile around the mounting hole in a direction perpendicular to the thickness direction of the cover assembly, the first opening profile also being a runway-shaped structure; wherein the minimum distance between the arc segment of the first cross-section and the arc segment of the first opening profile is a, and the distance between the straight segment of the first cross-section and the straight segment of the first opening profile is b, satisfying 0.02mm≤ba≤0.1mm.

[0005] Beneficial effect: By making the distance between the two straight sections of the pole and the sealing ring greater than the distance between the two arc sections, after the pole is riveted and deformed and the material expands, the extrusion of the sealing ring by the straight section of the pole is reduced, thereby reducing the impact of the expansion of the material at the straight section of the pole on the cover body, avoiding excessive expansion of the cover body causing the cover body to bulge outward, thereby ensuring the width consistency of the cover body, and then ensuring the assembly effect of the cover assembly and the shell.

[0006] In an optional embodiment, the minimum distance a between the arc segment of the first cross section and the arc segment of the first opening profile satisfies 0.01 mm≤a≤0.1 mm.

[0007] Beneficial effect: while facilitating the assembly of the pole and the sealing ring, the sealing effect of the sealing ring is ensured.

[0008] In an optional embodiment, a distance b between the straight line segment of the first cross section and the straight line segment of the first opening profile satisfies 0.04 mm ≤ b ≤ 0.2 mm.

[0009] Beneficial effect: while facilitating the assembly of the pole and the sealing ring, the sealing effect of the sealing ring is ensured.

[0010] In an optional embodiment, the outer contour of the first cross-section includes two first straight line segments and two first arc segments, the two first straight line segments are relatively spaced apart along the width direction of the cover body, and the two first arc segments are relatively spaced apart along the length direction of the cover body, the two first arc segments are respectively connected to the two ends of the first straight line segments on the same side, and the center distance between the two first arc segments is c, satisfying 1mm≤c≤20mm.

[0011] In an optional embodiment, the first opening profile includes two second straight line segments and two second arc segments, the two second straight line segments are relatively spaced apart along the width direction of the cover plate body, and the two second arc segments are relatively spaced apart along the length direction of the cover plate body, the two second arc segments are respectively connected to the two ends of the second straight line segments on the same side, the center distance between the two second arc segments is d, and satisfies 0.96mm≤d≤19.8mm.

[0012] In an optional embodiment, the center distance c between the two first arc segments and the center distance d between the two second arc segments satisfy 0.04 mm ≤ cd ≤ 0.2 mm.

[0013] In an optional embodiment, the radius of the first arc segment is r, satisfying 1.5 mm ≤ r ≤ 12.5 mm; the radius of the second arc segment is R, satisfying 1.54 mm ≤ R ≤ 12.7 mm.

[0014] Beneficial effect: Through the non-concentric design of the pole and the sealing ring and the radius design of the arc segment, the gap between the straight segments of the pole and the sealing ring and the gap between the arc segments are controlled, so that the sealing ring has a consistent extrusion amount after the pole circumferentially expands, ensuring the width consistency of the cover body, and further ensuring the assembly effect of the cover assembly and the shell.

[0015] In an optional embodiment, the sealing ring has the same wall thickness around the mounting hole.

[0016] Beneficial effect: The overall structure of the sealing ring is simple and easy to process and manufacture.

[0017] In a second aspect, the present invention further provides a battery comprising:

[0018] The shell is open at least at one end;

[0019] The cover assembly is connected to the housing and blocks the opening to enclose and form a receiving space;

[0020] The battery cell is arranged in the accommodating space.

[0021] In a third aspect, the present invention further provides a battery pack comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a pole in a first cross section according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the sealing ring in the first opening profile according to an embodiment of the present invention;

[0025] Figure 3 for Figure 1 The poles and Figure 2 Schematic diagram of the sealing ring shown;

[0026] Figure 4 for Figure 3 A partial enlarged schematic diagram;

[0027] Figure 5 This is a schematic diagram of the overall structure of a cover plate assembly according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 The exploded structural diagram of the cover assembly shown;

[0029] Figure 7 for Figure 5 A top view of the cover assembly is shown;

[0030] Figure 8 for Figure 7 Cross-sectional view of the middle cover assembly in the AA direction

[0031] Figure 9 for Figure 8 A partial enlarged schematic diagram of B in the middle.

[0032] Description of reference numerals:

[0033] 1. Cover plate body; 11. Pole hole; 12. First surface; 13. Second surface; 2. Pole; 21. First column segment; 211. First cross section; 2111. First straight line segment; 2112. First arc segment; 22. Second column segment; 23. Third column segment; 24. Pole base plate; 3. Sealing ring; 31. Mounting hole; 32. First opening profile; 321. Second straight line segment; 322. Second arc segment; 4. Riveted part; 41. Riveted hole; 411. First hole segment; 412. Second hole segment; 42. Riveted surface; 5. Upper insulating part; 6. Lower insulating part. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following combination Figures 1 to 9 , describing embodiments of the present invention.

[0036] According to an embodiment of the present invention, on the one hand, a cover assembly is provided, including: a cover body 1, a pole hole 11 is opened along the thickness direction of the cover assembly; a pole 2, which is inserted into the pole hole 11 and has a first column segment 21, the first column segment 21 has a first cross-section 211 in a direction perpendicular to the thickness of the cover assembly, and the first cross-section 211 is a runway-shaped structure; a sealing ring 3, a mounting hole 31 is provided through the cover assembly along the thickness direction, the first column segment 21 is inserted into the mounting hole 31, the sealing ring 3 forms a first opening profile 32 around the mounting hole 31 in a direction perpendicular to the thickness of the cover assembly, and the first opening profile 32 is also a runway-shaped structure; wherein, the minimum distance between the arc segment of the first cross-section 211 and the arc segment of the first opening profile 32 is a, and the distance between the straight segment of the first cross-section 211 and the straight segment of the first opening profile 32 is b, satisfying 0.02mm≤ba≤0.1mm.

[0037] By applying the cover assembly of this embodiment, by making the distance between the two straight sections of the pole 2 and the sealing ring 3 greater than the distance between the two arc sections, after the pole 2 is riveted and deformed and the material expands, the extrusion of the sealing ring 3 by the straight section of the pole 2 is reduced, thereby reducing the impact of the expansion of the material at the straight section of the pole 2 on the cover body 1, avoiding excessive expansion of the cover body 1 and causing the cover body 1 to bulge outward, thereby ensuring the width consistency of the cover body 1, and then ensuring the assembly effect of the cover assembly and the shell.

[0038] Specifically, if the value of ba is too small, the gap between the two straight sections of the pole 2 and the sealing ring 3 is not enough to accommodate the expansion of the straight section of the pole 2, and there is still a risk of the cover body 1 bulging outward; if the value of ba is too large, the gap between the two straight sections of the pole 2 and the sealing ring 3 is too large, even if the pole 2 expands after riveting deformation, it is not enough to make up for the gap between the pole 2 and the sealing ring 3, resulting in poor sealing effect of the sealing ring 3 and the risk of battery leakage.

[0039] Optionally, the value of ba is any value among 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, or a value between any two values.

[0040] It is worth noting that, please refer to Figure 9 The first column segment 21 is located in the pole hole 11 , and the sealing ring 3 is squeezed and sealed between the first column segment 21 and the hole wall of the pole hole 11 to seal the pole hole 11 .

[0041] It should be noted that when the pole 2 is riveted and deformed to be fixedly assembled with the cover body 1, the straight section will expand more than the arc section. If excessive expansion of the straight section is to be avoided, the riveting deformation of the pole 2 needs to be smaller, resulting in insufficient edge pressing of the pole 2. Therefore, in order to ensure that the pole 2 has sufficient edge pressing after riveting, the straight section will usually produce excessive expansion, which will cause the edge of the cover body 1 to bulge outward.

[0042] Therefore, in this embodiment, the spacing between the two straight sections of the pole 2 and the sealing ring 3 is greater than the spacing between the two arc sections. Even if the riveting deformation of the pole 2 is the same and the straight section of the pole 2 expands more than the arc section of the pole 2, the spacing between the two straight sections of the pole 2 and the sealing ring 3 can accommodate the expansion of the straight section of the pole 2, so that the circumferential extrusion of the sealing ring 3 by the pole 2 is equal. While ensuring the edge pressing amount of the pole 2, it is avoided that the cover body 1 protrudes too much outward due to excessive expansion of the straight section of the pole 2, thereby ensuring the width consistency of the cover body 1.

[0043] It is worth noting that the cover assembly of this embodiment is applied to blade batteries. The cover body 1 of the blade battery has a large aspect ratio, that is, the length of the cover body 1 is large and the width is small. At present, the industry has increasingly higher requirements for the charge and discharge rates of batteries, which requires the current capacity of the pole 2 to be increased, that is, the cross-sectional area of ​​the pole 2 perpendicular to the thickness direction needs to be increased. In the prior art, the cross-section of the pole 2 perpendicular to the thickness direction is usually circular. Since the width of the cover body 1 of the blade battery is small, it is not convenient to increase the diameter of the circle. Therefore, two cylindrical poles 2 are usually provided in the prior art to increase the current capacity. Such a setting results in a complicated assembly process of the cover assembly and low assembly efficiency. In this embodiment, the size of the pole 2 along the length direction of the cover body 1 is increased, which can not only improve the current capacity of the pole 2, but also does not need to increase the number of poles 2, thereby ensuring assembly efficiency.

[0044] Specifically, in one embodiment, Figure 4 As shown, the minimum distance a between the arc segment of the first cross section 211 and the arc segment of the first opening profile 32 satisfies 0.01mm≤a≤0.1mm. This arrangement facilitates the assembly of the pole 2 and the sealing ring 3 while ensuring the sealing effect of the sealing ring 3.

[0045] It is worth noting that if the value of a is too small, it will be difficult to insert the sealing ring 3 into the terminal 2, making it difficult to assemble the terminal 2 and the sealing ring 3. Moreover, after the terminal 2 is riveted and deformed and the material expands, the degree of compression on the sealing ring 3 is too large, which can easily cause deformation of the cover body 1. If the value of a is too large, the gap between the sealing ring 3 and the terminal 2 is too large. Even after the terminal 2 is riveted and deformed and the material expands, the gap cannot be completely filled, resulting in a poor sealing effect of the sealing ring 3 and a risk of battery leakage.

[0046] Optionally, the value of a is any value among 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, or a value between any two values.

[0047] Specifically, in one embodiment, Figure 4 As shown, the distance b between the straight section of the first cross section 211 and the straight section of the first opening profile 32 satisfies 0.04 mm ≤ b ≤ 0.2 mm. This arrangement facilitates the assembly of the pole 2 and the sealing ring 3 while ensuring the sealing effect of the sealing ring 3.

[0048] It is worth noting that if the value of b is too small, it will be difficult to insert the sealing ring 3 into the terminal 2, making it difficult to assemble the terminal 2 and the sealing ring 3. Moreover, the deformation and expansion of the terminal 2 during riveting will cause excessive pressure on the sealing ring 3, which can easily cause deformation of the cover body 1. If the value of b is too large, the gap between the sealing ring 3 and the terminal 2 will be too large. Even after the deformation and expansion of the terminal 2 during riveting, the gap cannot be completely filled, resulting in a poor sealing effect of the sealing ring 3 and a risk of battery leakage.

[0049] Optionally, the value of b is any value among 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, or a value between any two values.

[0050] Specifically, in one embodiment, Figure 1 As shown, the outer contour of the first cross-section 211 includes two first straight line segments 2111 and two first circular arc segments 2112. The two first straight line segments 2111 are relatively spaced apart along the width direction of the cover body 1, and the two first circular arc segments 2112 are relatively spaced apart along the length direction of the cover body 1. The two first circular arc segments 2112 are respectively connected to the two ends of the two first straight line segments 2111 on the same side.

[0051] And, in one embodiment, as Figure 2 As shown, the first opening profile 32 includes two second straight line segments 321 and two second arc segments 322. The two second straight line segments 321 are relatively spaced apart along the width direction of the cover body 1, and the two second arc segments 322 are relatively spaced apart along the length direction of the cover body 1. The two second arc segments 322 are respectively connected to the two ends of the second straight line segments 321 on the same side.

[0052] Therefore, the first straight line segment 2111 and the second straight line segment 321 are set correspondingly, and the value of b is the distance between the first straight line segment 2111 and the second straight line segment 321. The first arc segment 2112 and the second arc segment 322 are set correspondingly, and the value of a is the distance between the midpoint of the first arc segment 2112 and the midpoint of the second arc segment 322.

[0053] Furthermore, in one embodiment, Figure 1 As shown, the distance between the centers of the two first arc segments 2112 is c, which satisfies 1mm≤c≤20mm; Figure 2 As shown, the distance between the centers of the two second arc segments 322 is d, which satisfies 0.96 mm≤d≤19.8 mm.

[0054] Optionally, the value of c is any value among 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, or a value between any two values.

[0055] Optionally, the value of d is any value among 0.96 mm, 2.8 mm, 4.8 mm, 6.8 mm, 8.8 mm, 10.8 mm, 12.8 mm, 14.8 mm, 16.8 mm, 19.8 mm, or a value between any two values.

[0056] Furthermore, in one embodiment, Figure 1 and Figure 2 As shown, the center distance c of the two first arc segments 2112 and the center distance d of the two second arc segments 322 satisfy 0.04mm≤cd≤0.2mm. Figure 1 As shown, the radius of the first arc segment 2112 is r, which satisfies 1.5 mm ≤ r ≤ 12.5 mm; Figure 2 As shown, the radius of the second arc segment 322 is R, which satisfies 1.54 mm ≤ R ≤ 12.7 mm.

[0057] It is worth noting that by designing the pole 2 and the sealing ring 3 non-concentrically and designing the radius of the arc segment, the gap between the straight segments of the pole 2 and the sealing ring 3 and the gap between the arc segments are controlled, so that the pole 2 has a consistent extrusion amount on the sealing ring 3 after the circumferential expansion, ensuring the width consistency of the cover body 1, and further ensuring the assembly effect of the cover assembly and the shell.

[0058] It should be noted that, since the pole 2 and the sealing ring 3 are usually designed separately during the manufacturing process, the two gaps a and b are usually controlled by designing the concentric distances c and d of the two arc segments, as well as their radii r and R. Therefore, b=Rr, a=R-r+(dc) / 2, that is, ba=(cd) / 2.

[0059] Optionally, the value of cd is any value of 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.2mm, or a value between any two values.

[0060] Optionally, the value of r is any value among 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 12.5mm, or a value between any two values.

[0061] Optionally, the value of R is any value among 1.54mm, 2.2mm, 3.2mm, 4.2mm, 5.2mm, 6.2mm, 7.2mm, 8.2mm, 9.2mm, 10.2mm, 11.2mm, 12.2mm, 12.7mm, or a value between any two values.

[0062] It is worth noting that, please refer to Figure 2 In this embodiment, the sealing ring 3 has a uniform wall thickness around the mounting hole 31. This arrangement ensures a simple overall structure for the sealing ring 3 and facilitates manufacturing. Specifically, by controlling the gaps between the straight segments and the arc segments of the terminal 2 and the sealing ring 3, even if the terminal 2 experiences different expansions after riveting deformation while the sealing ring 3 maintains the same wall thickness, the amount of compression applied to each portion of the sealing ring 3 is essentially uniform, thus preventing expansion of the cover body 1.

[0063] In one embodiment, Figure 8 As shown, the cover body 1 has a first surface 12 and a second surface 13 disposed opposite each other along the thickness direction. The cover assembly also includes a rivet 4 disposed on the first surface 12. The rivet 4 has a rivet hole 41 extending through the thickness direction and a rivet pressing surface 42 formed on the rivet 4. The pole 2 is inserted through both the pole hole 11 and the rivet hole 41. The pole 2 includes a second pole segment 22 and a third pole segment 23. The second pole segment 22 is riveted to the rivet pressing surface 42, and the third pole segment 23 is connected to the end of the second pole segment 22 closest to the first surface 12. This arrangement utilizes the riveted deformation of the pole 2 and the cooperation of the rivet 4 to achieve assembly and fixation with the cover body 1, resulting in a simple assembly method.

[0064] It should be noted that before the pole 2 is riveted, the shape of the original second pole segment 22 (before deformation) is the same as the shape of the third pole segment 23. The original second pole segment 22 is riveted to deform the original second pole segment 22, so that the deformed second pole segment 22 is riveted to the riveting surface 42 of the rivet 4, thereby fixing the pole 2, the rivet 4, and the cover body 1.

[0065] In one embodiment, Figure 9 As shown, the rivet hole 41 includes a first hole segment 411 and a second hole segment 412 connected along the thickness direction. The second column segment 22 is located within the first hole segment 411, and the third column segment 23 is located within the second hole segment 412. The connection between the first hole segment 411 and the second hole segment 412 forms a rivet pressing surface 42. By providing the first hole segment 411 and the second hole segment 412, the rivet hole 41 forms a stepped hole, thereby forming a rivet pressing surface 42 within the rivet hole 41. The terminal 2 is riveted to the interior of the first hole segment 411 through the second column segment 22, facilitating welding of the battery to the busbar via the rivet 4 and preventing any impact on the battery's energy density.

[0066] It is worth noting that the original second column segment 22 is riveted to deform the original second column segment 22 so that the deformed second column segment 22 is located in the first hole segment 411 .

[0067] In one embodiment, Figure 1 and Figure 9 As shown, the pole 2 further includes a pole base plate 24. The first pole segment 21 is connected to the end of the third pole segment 23 away from the second pole segment 22. The pole base plate 24 is connected to the end of the first pole segment 21 away from the third pole segment 23. The first pole segment 21 is inserted into the pole hole 11, and the cover body 1 is sandwiched between the rivet 4 and the pole base plate 24. The second pole segment 22 and the pole base plate 24 of the pole 2 are used to achieve the assembly and fixation of the pole 2, the rivet 4, and the cover body 1.

[0068] It is worth noting that if Figure 9 As shown, the outer wall of the first column segment 21 protrudes outward from the outer wall of the third column segment 23 to form a step surface at the connection between the third column segment 23 and the first column segment 21, and the side of the rivet 4 facing the first surface 12 is arranged in contact with the step surface.

[0069] In one embodiment, Figures 5 to 9 As shown, the cover assembly further includes an upper insulating member 5 , at least a portion of which is sandwiched between a side of the rivet 4 facing the first surface 12 and the first surface 12 .

[0070] In one embodiment, Figure 5 、 Figure 6 and Figure 9 As shown, the cover plate assembly further includes a lower insulating member 6 , which is disposed on the second surface 13 .

[0071] Furthermore, a portion of the lower insulating member 6 extends between the second surface 13 and a surface of the pole bottom plate 24 facing the second surface 13 .

[0072] The following observations are made on the assembly of poles 2 and sealing rings 3 of different sizes. The assembly results of the embodiment and the comparative example are shown in Table 1. The embodiment refers to the pole 2 and sealing ring 3 that meet the requirements of the embodiment, and the comparative example refers to the pole 2 and sealing ring 3 that do not meet the requirements of the embodiment.

[0073] Table 1 Assembly of the pole 2 and the sealing ring 3 of the embodiment and the pole 2 and the sealing ring 3 of the comparative example

[0074]

[0075]

[0076] As can be seen from Table 1, in Examples 1 to 10, the value of R is in the range of 1.54 mm to 12.7 mm, the value of r is in the range of 1.5 mm to 12.5 mm, the value of c is in the range of 1 mm to 20 mm, the value of d is in the range of 0.96 mm to 19.8 mm, the value of a is in the range of 0.01 mm to 0.1 mm, the value of b is in the range of 0.04 mm to 0.2 mm, and the value of cd is in the range of 0.04 mm to 0.2 mm. Therefore, in Examples 1 to 10, the riveting of the pole 2 is normal, no deformation of the cover body 1 occurs, and the pole 2 meets the airtightness requirements.

[0077] As can be seen from Table 1, in Comparative Examples 1 and 2, the value of a is less than 0.01 mm, the arc segment gap is too small, the pole 2 and the sealing ring 3 are assembled too tightly, and the sealing ring 3 is easily skewed and poorly assembled.

[0078] As can be seen from Table 1, in Comparative Examples 3 and 4, the value of a is greater than 0.1 mm, the value of b is greater than 0.2 mm, the gap between the first arc segment 2112 and the second arc segment 322, and the gap between the first straight segment 2111 and the second straight segment 321 are too large, the pole 2 and the sealing ring 3 are loosely assembled and poorly positioned, and the pole 2 has poor airtightness after assembly.

[0079] It can be seen from Table 1 that in Comparative Examples 5 and 6, the value of b is less than 0.04 mm, the value of cd is less than 0.04 mm, the gap between the straight segments is too small, the pole 2 and the sealing ring 3 are assembled too tightly, the sealing ring 3 is easily skewed and assembled poorly, and the difference in cd is too small, the extrusion amount is not equal, and the cover body 1 swells and deforms.

[0080] It can be seen from Table 1 that in Comparative Examples 7 and 8, the cd value is greater than 0.2 mm, that is, the cd difference is too large, the extrusion amount is not equal, the gap after the straight section expands is too large, and the pole 2 does not pass the air tightness test.

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

[0082] The shell is open at least at one end;

[0083] The cover assembly is connected to the housing and blocks the opening to enclose and form a receiving space;

[0084] The battery cell is arranged in the accommodating space.

[0085] According to another aspect of the embodiments of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0086] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: The cover plate body is provided with a pole hole along the thickness direction of the cover plate assembly; a pole, passing through the pole hole and having a first pole section, wherein the first pole section has a first cross-section in a direction perpendicular to the thickness of the cover assembly, and the first cross-section is a runway-shaped structure; A sealing ring is provided with a mounting hole extending through the thickness direction of the cover plate assembly, the first column segment is inserted into the mounting hole, and the sealing ring surrounds the mounting hole in a direction perpendicular to the thickness direction of the cover plate assembly to form a first opening profile, the first opening profile also having a runway-shaped structure; The minimum distance between the arc segment of the first cross section and the arc segment of the first opening profile is a, and the distance between the straight line segment of the first cross section and the straight line segment of the first opening profile is b, satisfying 0.02mm≤ba≤0.1mm.

2. The cover plate assembly according to claim 1, wherein: A minimum distance a between the arc segment of the first cross section and the arc segment of the first opening profile satisfies 0.01 mm≤a≤0.1 mm.

3. The cover plate assembly according to claim 1, wherein: A distance b between the straight line segment of the first cross section and the straight line segment of the first opening profile satisfies 0.04 mm ≤ b ≤ 0.2 mm.

4. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The outer contour of the first cross-section includes two first straight line segments and two first arc segments. The two first straight line segments are relatively spaced apart along the width direction of the cover body, and the two first arc segments are relatively spaced apart along the length direction of the cover body. The two first arc segments are respectively connected to the two ends of the first straight line segments on the same side. The center distance between the two first arc segments is c, satisfying 1mm≤c≤20mm.

5. The cover plate assembly according to claim 4, wherein: The first opening profile includes two second straight line segments and two second arc segments, the two second straight line segments are relatively spaced apart along the width direction of the cover plate body, and the two second arc segments are relatively spaced apart along the length direction of the cover plate body. The two second arc segments are respectively connected to the two ends of the second straight line segments on the same side, and the center distance between the two second arc segments is d, satisfying 0.96mm≤d≤19.8mm.

6. The cover plate assembly according to claim 5, wherein: The center distance c between the two first arc segments and the center distance d between the two second arc segments satisfy 0.04 mm ≤ cd ≤ 0.2 mm.

7. The cover plate assembly according to claim 5, wherein: The radius of the first arc segment is r, satisfying 1.5mm≤r≤12.5mm; the radius of the second arc segment is R, satisfying 1.54mm≤R≤12.7mm.

8. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The sealing ring has the same wall thickness surrounding the mounting hole.

9. A battery, characterized in that: include: The shell is open at least at one end; The cover assembly according to any one of claims 1 to 8, connected to the housing and blocking the opening to enclose and form a receiving space; The battery cell is arranged in the accommodating space.

10. A battery pack, characterized in that: A battery comprising the battery of claim 9.

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