Sealing ring, cover plate assembly and battery

Abstract

The present invention relates to the technical field of batteries, and discloses a sealing ring, a cover plate assembly and a battery, the sealing ring comprises: a main ring layer, the main ring layer surrounds a mounting hole in a direction perpendicular to a first direction to form a first inner contour and a first outer contour, and the first inner contour and the first outer contour are both runway-shaped structures; wherein the distance between the arc section of the first inner contour and the arc section of the first outer contour is c, the distance between the linear section of the first inner contour and the linear section of the first outer contour is d, and c-d is larger than or equal to 0.1 mm and smaller than or equal to 1.5 mm. The wall thickness of the straight section of the main ring layer is smaller than the wall thickness of the arc section of the main ring layer, and after the pole is subjected to riveting deformation and material expansion, the extrusion of the straight section of the pole on the sealing ring is reduced, so that the influence of the material expansion at the straight section of the pole on the cover plate body is reduced, the cover plate body is prevented from protruding outwards due to excessive material expansion, and the service life of the cover plate body is prolonged. Therefore, the width consistency of the cover plate body is ensured, and the assembly effect of the cover plate assembly and the shell is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a sealing ring, a cover plate assembly and a battery. Background Art

[0002] The battery cover is provided with a pole hole, and the pole is inserted into the pole hole and assembled and fixed to the battery cover. During the installation of the pole, in order to prevent the battery from leaking at the pole hole, a sealing ring is usually sleeved on the outer periphery of the pole to seal the installation position of the pole. However, in the process of riveting the pole to deform the pole, thereby riveting and fixing the pole, the rivet and the cover body, if the pole expands to varying degrees along the circumferential direction, it will cause varying degrees of squeezing on the sealing ring, and then cause the battery cover to expand, thereby causing the width of the battery cover to increase, resulting in poor width consistency of the battery cover, 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 sealing ring, a cover plate assembly and a battery 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 sealing ring having a mounting hole extending along a first direction, comprising: a main ring layer, wherein the main ring layer forms a first inner contour and a first outer contour around the mounting hole in a direction perpendicular to the first direction, and the first inner contour and the first outer contour are both runway-shaped structures; wherein, along the third direction, the distance between the midpoint of the circular arc segment of the first inner contour and the midpoint of the circular arc segment of the first outer contour is c, and along the second direction, the distance between the straight line segment of the first inner contour and the straight line segment of the first outer contour is d, satisfying 0.1mm≤cd≤1.5mm.

[0005] Beneficial effect: By making the wall thickness of the straight section of the main ring layer smaller than the wall thickness of the arc section of the main ring layer, 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 distance c between the midpoint of the arc segment of the first inner contour and the midpoint of the arc segment of the first outer contour satisfies 0.5mm≤c≤2mm; and / or, the distance d between the straight line segment of the first inner contour and the straight line segment of the first outer contour satisfies 0.3mm≤d≤1mm.

[0007] Beneficial effect: while avoiding excessive squeezing of the sealing ring, the sealing effect of the sealing ring is ensured.

[0008] In an optional embodiment, the first inner contour includes two first straight line segments and two first arc segments, the two first straight line segments are relatively spaced along the second direction, the two first arc segments are relatively spaced along the third direction, 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 a, and satisfies 1mm≤a≤20mm.

[0009] In an optional embodiment, the first outer contour includes two second straight line segments and two second arc segments, the two second straight line segments are relatively spaced along the second direction, the two second arc segments are relatively spaced along the third direction, the two second arc segments are respectively connected to the two ends of the two second straight line segments on the same side, the center distance between the two second arc segments is b, and satisfies 1.2mm≤b≤23mm.

[0010] In an optional embodiment, a distance a between the centers of two first arc segments and a distance b between the centers of two second arc segments satisfy 0.2 mm ≤ ba ≤ 3 mm.

[0011] In an optional embodiment, the radius of the first arc segment is R1, satisfying 1.52 mm ≤ R1 ≤ 10.58 mm; and / or the radius of the second arc segment is R2, satisfying 1.82 mm ≤ R2 ≤ 11.58 mm.

[0012] Beneficial effect: Through the non-concentric design of the first inner contour and the first outer contour of the main ring layer and the radius design of the arc segment, the straight segment and the arc segment of the main ring layer have appropriate wall thickness, while ensuring the sealing effect of the sealing ring, the sealing ring has a consistent extrusion amount after the pole circumferential material expands, ensuring the width consistency of the cover body, and thus ensuring the assembly effect of the cover assembly and the shell.

[0013] In a second aspect, the present invention further provides a cover assembly, comprising: a cover body, having a pole hole opened along a first direction; a pole, passing through the pole hole and having a first pole section, the first pole section having a first cross-section perpendicular to the first direction, the first cross-section being a runway-shaped structure; the above-mentioned sealing ring, the first pole section being inserted into the mounting hole.

[0014] Beneficial effect: The above-mentioned sealing ring is used to reduce 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 further ensuring the assembly effect of the cover assembly and the shell.

[0015] In an optional embodiment, a gap e between the outer contour of the first cross section and the first inner contour satisfies 0.02 mm ≤ e ≤ 0.08 mm.

[0016] Beneficial effect: while facilitating the assembly of the pole and the sealing ring, the sealing effect of the sealing ring is ensured.

[0017] In an optional embodiment, the outer contour of the first cross-section includes two third straight line segments and two third circular arc segments, the two third straight line segments are relatively spaced apart along the second direction, the two third circular arc segments are relatively spaced apart along the third direction, the two third circular arc segments are respectively connected to the two ends of the third straight line segments on the same side, and the radius of the third circular arc segment is r, satisfying 1.5mm≤r≤10.5mm.

[0018] In a third aspect, the present invention further provides a battery comprising the above-mentioned cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A top view of a sealing ring according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A front view of the sealing ring is shown;

[0022] Figure 3 This is a front view of another sealing ring according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a pole in a first cross section according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the assembly structure of the pole and the sealing ring according to an embodiment of the present invention;

[0025] Figure 6 for Figure 5 A partial enlarged schematic diagram of center C;

[0026] Figure 7 This is a schematic diagram of the overall structure of a cover plate assembly according to an embodiment of the present invention;

[0027] Figure 8 for Figure 7The exploded structural diagram of the cover assembly shown;

[0028] Figure 9 for Figure 7 A top view of the cover assembly is shown;

[0029] Figure 10 for Figure 9 Cross-sectional view of the middle cover assembly in the AA direction

[0030] Figure 11 for Figure 10 A partial enlarged schematic diagram of B in the middle.

[0031] Description of reference numerals:

[0032] 1. Main ring layer; 101. First inner contour; 1011. First straight line segment; 1012. First arc segment; 102. First outer contour; 1021. Second straight line segment; 1022. Second arc segment; 2. Step ring layer; 10. Sealing ring; 11. Mounting hole; 20. Cover body; 21. Pole hole; 22. First surface; 23. Second surface; 30. Pole; 31. First column segment; 311. First cross section; 3111. Third straight line segment; 3112. Third arc segment; 32. Second column segment; 33. Third column segment; 34. Pole bottom plate; 40. Riveted part; 41. Riveted hole; 411. First hole segment; 412. Second hole segment; 42. Riveted surface; 50. Upper insulating part; 60. Lower insulating part. DETAILED DESCRIPTION

[0033] 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.

[0034] The following combination Figures 1 to 11 , describing embodiments of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, a sealing ring 10 is provided, which is provided with a mounting hole 11 along a first direction, and includes: a main ring layer 1, which forms a first inner contour 101 and a first outer contour 102 around the mounting hole 11 in a direction perpendicular to the first direction, and the first inner contour 101 and the first outer contour 102 are both runway-shaped structures; wherein, along the third direction, the distance between the midpoint of the arc segment of the first inner contour 101 and the midpoint of the arc segment of the first outer contour 102 is c, and along the second direction, the distance between the straight line segment of the first inner contour 101 and the straight line segment of the first outer contour 102 is d, satisfying 0.1mm≤cd≤1.5mm.

[0036] By applying the sealing ring 10 of this embodiment, the wall thickness of the straight section of the main ring layer 1 is made smaller than the wall thickness of the arc section of the main ring layer 1. After the pole 30 is riveted and deformed and the material expands, the extrusion of the sealing ring 10 by the straight section of the pole 30 is reduced, thereby reducing the influence of the expansion of the material at the straight section of the pole 30 on the cover body 20, avoiding excessive expansion of the cover body 20 causing the cover body 20 to bulge outward, thereby ensuring the width consistency of the cover body 20, and then ensuring the assembly effect of the cover assembly and the shell.

[0037] Specifically, if the value of cd is too small, the difference between the wall thickness of the straight section of the main ring layer 1 and the wall thickness of the arc section of the main ring layer 1 is too small, which is not enough to compensate for the difference in material expansion between the straight section and the arc section of the pole 30, and there is still a risk of bulging of the cover body 20; if the value of cd is too large, it is easy to cause insufficient squeezing of the straight section of the main ring layer 1 by the pole 30 after expansion, resulting in poor sealing effect of the sealing ring 10 and the risk of battery leakage.

[0038] Optionally, the value of cd is any value among 0.1mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, or a value between any two values.

[0039] It should be noted that when the pole 30 is riveted and deformed to be fixedly assembled with the cover body 20, 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 30 needs to be smaller, resulting in insufficient edge pressing of the pole 30. Therefore, in order to ensure that the pole 30 has sufficient edge pressing after riveting, the straight section will usually produce excessive expansion, which will cause the edge of the cover body 20 to bulge outward.

[0040] Therefore, in this embodiment, the wall thickness of the straight section of the main ring layer 1 is made smaller than the wall thickness of the circular section of the main ring layer 1. Even if the riveting deformation amount of the pole 30 is the same and the straight section of the pole 30 expands more than the circular section of the pole 30, the difference in the wall thickness of the straight section of the main ring layer 1 and the circular section of the main ring layer 1 can compensate for the expansion difference between the straight section and the circular section of the pole 30, so that the circumferential extrusion amount of the pole 30 on the sealing ring 10 is equal. While ensuring the edge pressing amount of the pole 30, it is avoided that the cover plate body 20 protrudes too much outward due to excessive expansion of the straight section of the pole 30, thereby ensuring the width consistency of the cover plate body 20.

[0041] It is worth noting that the cover plate assembly of this embodiment is applied to blade batteries. The cover plate body 20 of the blade battery has a large aspect ratio, that is, the cover plate body 20 is longer and smaller in width. Currently, the industry's requirements for battery charge and discharge rates are becoming increasingly higher, which also requires that the current flow capacity of the pole 30 be increased. In other words, the cross-sectional area of ​​the pole 30 perpendicular to the thickness direction needs to be increased. In the prior art, the cross-section of the pole 30 perpendicular to the thickness direction is usually circular. Since the width of the cover plate body 20 of the blade battery is relatively small, it is not convenient to increase the diameter of the circle. Therefore, the prior art usually provides two cylindrical poles 30 to increase the current flow capacity. Such an arrangement results in a complicated assembly process of the cover plate assembly and low assembly efficiency. In this embodiment, the size of the pole 30 along the length direction of the cover plate body 20 is increased. This can not only improve the current flow capacity of the pole 30, but also does not require an increase in the number of poles 30, thereby ensuring assembly efficiency.

[0042] It should be noted that the first direction is the thickness direction of the cover assembly, the second direction is the width direction of the cover assembly, and the third direction is the length direction of the cover assembly.

[0043] Specifically, in one embodiment, Figure 1 As shown, the distance c between the midpoint of the arc segment of the first inner contour 101 and the midpoint of the arc segment of the first outer contour 102 satisfies 0.5mm≤c≤2mm. This arrangement avoids excessive squeezing of the sealing ring 10 while ensuring the sealing effect of the sealing ring 10.

[0044] It is worth noting that if the value of c is too small, the wall thickness of the arc segment of the main ring layer 1 is too small. Even after the terminal 30 is riveted and deformed, the arc segment of the main ring layer 1 will be squeezed to a small extent, resulting in a poor sealing effect of the sealing ring 10 and a risk of battery leakage. If the value of c is too large, the wall thickness of the arc segment of the main ring layer 1 is too large. After the terminal 30 is riveted and deformed, the arc segment of the main ring layer 1 is squeezed too much, which can easily damage the sealing ring 10 and cause it to fail.

[0045] Optionally, the value of c is any value among 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, or a value between any two values.

[0046] Specifically, in one embodiment, Figure 1 As shown, the distance d between the straight line segment of the first inner contour 101 and the straight line segment of the first outer contour 102 satisfies 0.3 mm ≤ d ≤ 1 mm. This arrangement avoids excessive squeezing of the sealing ring 10 while ensuring the sealing effect of the sealing ring 10.

[0047] It is worth noting that if the value of d is too small, the wall thickness of the straight section of the main ring layer 1 is too small. Even after the pole 30 is riveted and deformed, the straight section of the main ring layer 1 will be squeezed to a small extent, resulting in a poor sealing effect of the sealing ring 10 and a risk of battery leakage. If the value of d is too large, the wall thickness of the straight section of the main ring layer 1 is too large. After the pole 30 is riveted and deformed, the straight section of the main ring layer 1 is squeezed too much, which can easily damage the sealing ring 10 and cause it to fail. It can also cause the cover plate body 20 to bulge outward due to excessive material expansion, thereby affecting the width consistency of the cover plate body 20 and the assembly effect of the cover plate assembly and the housing.

[0048] Optionally, the value of d is any value among 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or a value between any two values.

[0049] Specifically, in one embodiment, Figure 1 As shown, the first inner contour 101 includes two first straight line segments 1011 and two first circular arc segments 1012. The two first straight line segments 1011 are relatively spaced apart along the second direction, and the two first circular arc segments 1012 are relatively spaced apart along the third direction. The two first circular arc segments 1012 are respectively connected to the two ends of the two first straight line segments 1011 on the same side.

[0050] And, in one embodiment, as Figure 1 As shown, the first outer contour 102 includes two second straight line segments 1021 and two second circular arc segments 1022. The two second straight line segments 1021 are relatively spaced apart along the second direction, and the two second circular arc segments 1022 are relatively spaced apart along the third direction. The two second circular arc segments 1022 are respectively connected to the two ends of the two second straight line segments 1021 on the same side.

[0051] Therefore, if Figure 1 As shown, the first straight line segment 1011 and the second straight line segment 1021 are set correspondingly, and the value of d is the distance between the first straight line segment 1011 and the second straight line segment 1021. Figure 1As shown, the first arc segment 1012 and the second arc segment 1022 are set correspondingly, and the value of c is the distance between the midpoint of the first arc segment 1012 and the midpoint of the second arc segment 1022.

[0052] Furthermore, in one embodiment, Figure 1 As shown, the center distance between the two first arc segments 1012 is a, which satisfies 1mm≤a≤20mm; the center distance between the two second arc segments 1022 is b, which satisfies 1.2mm≤b≤23mm.

[0053] Optionally, the value of a is any value among 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, or a value between any two values.

[0054] Optionally, the value of b is any value among 1.2mm, 2.8mm, 4.8mm, 6.8mm, 8.8mm, 10.8mm, 12.8mm, 14.8mm, 16.8mm, 19.8mm, 23mm, or a value between any two values.

[0055] Furthermore, in one embodiment, Figure 1 As shown, the center distance a of the two first arc segments 1012 and the center distance b of the two second arc segments 1022 satisfy 0.2mm≤ba≤3mm. Figure 1 As shown, the radius of the first arc segment 1012 is R1, which satisfies 1.52 mm ≤ R1 ≤ 10.58 mm; the radius of the second arc segment 1022 is R2, which satisfies 1.82 mm ≤ R2 ≤ 11.58 mm.

[0056] It is worth noting that, through the non-concentric design of the first inner contour 101 and the first outer contour 102 of the main ring layer 1 and the radius design of the arc segment, the straight segment of the main ring layer 1 and the arc segment of the main ring layer 1 have appropriate wall thickness, while ensuring the sealing effect of the sealing ring 10, the sealing ring 10 has a consistent extrusion amount after the pole 30 expands circumferentially, ensuring the width consistency of the cover body 20, and thus ensuring the assembly effect of the cover assembly and the shell.

[0057] It should be noted that, during the manufacturing process, the size of the sealing ring 10 is mainly designed based on the size of the pole 30. Usually, the center distance a of the two first arc segments 1012 and the center distance b of the two second arc segments 1022, as well as the radii R1 and R2 of the arc segments are designed to control the wall thickness a and b. Therefore, d = R2-R1, c = R2-R1+(ba) / 2, that is, ba = 2×(cd).

[0058] Optionally, the value of ba is any value among 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or a value between any two values.

[0059] Optionally, the value of R1 is any value among 1.52mm, 2.5mm, 3.5mm, 4.5mm, 5.5mm, 6.5mm, 7.5mm, 8.5mm, 9.5mm, 10.58mm, or a value between any two values.

[0060] Optionally, the value of R2 is any value among 1.82mm, 2.8mm, 3.8mm, 4.8mm, 5.8mm, 6.8mm, 7.8mm, 8.8mm, 9.8mm, 10.88mm, 11.58mm, or a value between any two values.

[0061] In this embodiment, if Figure 2 and Figure 3 As shown, the sealing ring 10 also includes at least one stepped ring layer 2. The main ring layer 1 and the stepped ring layer 2 are sequentially connected along a first direction. The outer diameter of the stepped ring layer 2 is larger than that of the main ring layer 1, so that the outer peripheral wall of the sealing ring 10 forms a stepped structure. This arrangement facilitates the extrusion fit of the sealing ring 10 with the multiple structures of the cover plate assembly, simplifying the assembly process of the cover plate assembly while ensuring the sealing effect of the battery.

[0062] It is worth noting that the stepped ring layer 2 can be provided with a (see Figure 2 ), or two can be set (see Figure 3 ), of course, it can also be set to more, such as three, four, etc.

[0063] According to an embodiment of the present invention, on the other hand, a cover assembly is further provided, including: a cover body 20, having a pole hole 21 opened along a first direction; a pole 30, passing through the pole hole 21 and having a first pole section 31, the first pole section 31 having a first cross-section 311 perpendicular to the first direction, and the first cross-section 311 is a runway-shaped structure; the above-mentioned sealing ring 10, the first pole section 31 is inserted into the mounting hole 11.

[0064] In the cover assembly of this embodiment, the above-mentioned sealing ring 10 is used to reduce the impact of the expansion of the material at the straight section of the pole 30 on the cover body 20, avoiding excessive expansion of the cover body 20 and causing the cover body 20 to bulge outward, thereby ensuring the width consistency of the cover body 20, and further ensuring the assembly effect of the cover assembly and the shell.

[0065] It is worth noting that if Figure 11As shown, the first column segment 31 is located in the pole hole 21 , and the sealing ring 10 is squeezed and sealed between the first column segment 31 and the hole wall of the pole hole 21 to seal the pole hole 21 .

[0066] In one embodiment, Figure 6 As shown, the gap e between the outer contour of the first section 311 and the first inner contour 101 satisfies 0.02mm≤e≤0.08mm. This arrangement facilitates the assembly of the electrode 30 and the sealing ring 10 while ensuring the sealing effect of the sealing ring 10.

[0067] It is worth noting that if the value of e is too small, the gap between the terminal 30 and the sealing ring 10 is too small, making it difficult to assemble the terminal 30 and the sealing ring 10. If the value of e is too large, the gap between the terminal 30 and the sealing ring 10 is too large, and the terminal 30 does not squeeze the sealing ring 10 sufficiently after the material expands, affecting the sealing effect of the sealing ring 10.

[0068] Optionally, the value of e is any value among 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, or a value between any two values.

[0069] It should be noted that, along the circumference of the first cross section 311 and the circumference of the first inner contour 101 , the pole 30 and the sealing ring 10 are provided with equal gaps.

[0070] In one embodiment, Figure 4 As shown, the outer contour of the first cross-section includes two third straight line segments 3111 and two third circular arc segments 3112. The two third straight line segments 3111 are relatively spaced apart along the second direction, and the two third circular arc segments 3112 are relatively spaced apart along the third direction. The two third circular arc segments 3112 are respectively connected to the two ends of the two third straight line segments 3111 on the same side. The radius of the third circular arc segment 3112 is r, satisfying 1.5mm≤r≤10.5mm.

[0071] Optionally, the value of r is any value of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, or a value between any two values.

[0072] It is worth noting that if Figure 4 As shown, the distance between the centers of the two third arc segments 3112 is also a.

[0073] In one embodiment, Figures 7 to 11As shown, the cover body 20 has a first surface 22 and a second surface 23 disposed opposite each other along the thickness direction. The cover assembly also includes a rivet 40 disposed on the first surface 22. The rivet 40 has a rivet hole 41 extending through the thickness direction and a rivet pressing surface 42 formed on the rivet 40. The pole 30 is inserted through both the pole hole 21 and the rivet hole 41. The pole 30 includes a second pole segment 32 and a third pole segment 33. The second pole segment 32 is riveted to the rivet pressing surface 42, and the third pole segment 33 is connected to the end of the second pole segment 32 near the first surface 22. This arrangement utilizes the riveted deformation of the pole 30 and the cooperation of the rivet 40 to achieve assembly and fixation with the cover body 20, simplifying assembly.

[0074] It should be noted that before the pole 30 is riveted, the shape of the original second pole segment 32 (before deformation) is the same as the shape of the third pole segment 33. The original second pole segment 32 is riveted to deform it, so that the deformed second pole segment 32 is riveted to the riveting surface 42 of the rivet 40, thereby securing the pole 30, the rivet 40, and the cover body 20.

[0075] In one embodiment, Figure 11 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 32 is located within the first hole segment 411, and the third column segment 33 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 is formed into a stepped hole, thereby forming the rivet pressing surface 42 within the rivet hole 41. The terminal 30 is riveted to the interior of the first hole segment 411 through the second column segment 32, facilitating welding of the battery to the busbar via the rivet 40 and preventing any impact on the battery's energy density.

[0076] It is worth noting that the original second column segment 32 is riveted to deform the original second column segment 32 so that the deformed second column segment 32 is located in the first hole segment 411 .

[0077] In one embodiment, Figure 11 As shown, the pole 30 also includes a pole base plate 34. The first pole segment 31 is connected to the end of the third pole segment 33 away from the second pole segment 32. The pole base plate 34 is connected to the end of the first pole segment 31 away from the third pole segment 33. The first pole segment 31 is inserted into the pole hole 21, and the cover body 20 is sandwiched between the rivet 40 and the pole base plate 34. The second pole segment 32 and the pole base plate 34 of the pole 30 are used to achieve the assembly and fixation of the pole 30, the rivet 40, and the cover body 20.

[0078] It is worth noting that if Figure 11As shown, the outer wall of the first column segment 31 protrudes outward from the outer wall of the third column segment 33 to form a step surface at the connection between the third column segment 33 and the first column segment 31, and the side of the rivet 40 facing the first surface 22 is arranged in contact with the step surface.

[0079] In one embodiment, Figures 7 to 11 As shown, the cover assembly further includes an upper insulating member 50 , at least a portion of which is sandwiched between a surface of the rivet 40 facing the first surface 22 and the first surface 22 .

[0080] In one embodiment, Figure 7 、 Figure 8 and Figure 10 As shown, the cover assembly further includes a lower insulating member 60 , which is disposed on the second surface 23 .

[0081] Furthermore, a portion of the lower insulating member 60 extends between the second surface 23 and a surface of the pole bottom plate 34 facing the second surface 23 .

[0082] The following observations are made on the assembly of poles 30 and sealing rings 10 of different sizes. The assembly results of the embodiment and the comparative example are shown in Table 1. The embodiment refers to the pole 30 and sealing ring 10 that meet the requirements of the embodiment, and the comparative example refers to the pole 30 and sealing ring 10 that do not meet the requirements of the embodiment.

[0083] Table 1 Assembly of the pole 30 and the sealing ring 10 of the embodiment and the pole 30 and the sealing ring 10 of the comparative example

[0084]

[0085]

[0086] It can be seen from Table 1 that in Examples 1 to 10, the values ​​of c are all in the range of 0.5 mm to 2 mm, the values ​​of d are all in the range of 0.3 mm to 1 mm, and the values ​​of ba are all in the range of 0.2 mm to 3 mm. Therefore, in Examples 1 to 10, after the pole 30 and the sealing ring 10 are assembled, the extrusion deformation of the sealing ring 10 is good, there is no expansion in the width direction of the cover plate body 20, the size is qualified, the airtightness of the pole 30 is passed, and the lower insulating part 60 does not undergo expansion and deformation.

[0087] As can be seen from Table 1, in Comparative Examples 1 and 2, the value of d is not within the range of 0.3 mm to 1 mm and is less than 0.3 mm. The wall thickness of the straight section of the main ring layer 1 is too thin, which makes the sealing ring 10 difficult to form and easy to crack during demolding. After assembly, it is squeezed, which aggravates the cracking. Under high pressure, there is a breakdown phenomenon between the pole 30 and the cover body 20, causing a short circuit problem.

[0088] It can be seen from Table 1 that in Comparative Examples 3 and 4, the value of d is not within the range of 0.3 mm to 1 mm and is greater than 1 mm. The wall thickness of the straight section of the main ring layer 1 is too thick, resulting in excessive material expansion in the straight section, deformation of the cover body 20, and unqualified dimensions.

[0089] As can be seen from Table 1, in Comparative Examples 5 and 6, the value of ba is not within the range of 0.2 mm to 3 mm and is less than 0.2 mm. The difference in wall thickness between the arc segment and the straight segment of the main coil layer 1 is too small, resulting in excessive expansion of the straight segment when the pole 30 is riveted the same amount, causing the cover body 20 to deform and the size to be unqualified.

[0090] As can be seen from Table 1, in Comparative Examples 7 and 8, the value of ba is not within the range of 0.2 mm to 3 mm and is greater than 3 mm. The wall thickness difference between the arc segment and the straight segment of the main coil layer 1 is too large, resulting in insufficient squeezing of the straight segment of the main coil layer 1 when the pole 30 is riveted the same amount, resulting in airtightness failure.

[0091] As can be seen from Table 1, in Comparative Examples 9 and 10, the value of c is not within the range of 0.5 mm to 2 mm and is less than 0.5 mm. The wall thickness of the arc segment of the main ring layer 1 is too thin. During assembly and riveting, it is squeezed, which aggravates the cracking. Under high voltage, the pole 30 and the cover body 20 are broken down, causing a short circuit problem.

[0092] It can be seen from Table 1 that in Comparative Examples 11 and 12, the value of c is not within the range of 0.5 mm to 2 mm and is greater than 2 mm. The wall thickness of the arc segment of the main ring layer 1 is too thick, resulting in excessive extrusion of the arc segment, causing damage to the sealing ring 10 and failure of air tightness.

[0093] According to another aspect of an embodiment of the present invention, a battery is provided, comprising the above-mentioned cover plate assembly.

[0094] 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 sealing ring having a mounting hole extending through the first direction, characterized in that: include: a main ring layer, the main ring layer surrounding the mounting hole in a direction perpendicular to the first direction to form a first inner contour and a first outer contour, the first inner contour and the first outer contour both being runway-shaped structures; Among them, along the third direction, the distance between the midpoint of the arc segment of the first inner contour and the midpoint of the arc segment of the first outer contour is c, and along the second direction, the distance between the straight line segment of the first inner contour and the straight line segment of the first outer contour is d, satisfying 0.1mm≤cd≤1.5mm.

2. The sealing ring according to claim 1, characterized in that: The distance c between the midpoint of the arc segment of the first inner contour and the midpoint of the arc segment of the first outer contour satisfies 0.5 mm ≤ c ≤ 2 mm; and / or, A distance d between the straight line segment of the first inner contour and the straight line segment of the first outer contour satisfies 0.3 mm ≤ d ≤ 1 mm.

3. The sealing ring according to claim 1 or 2, characterized in that: The first inner contour includes two first straight line segments and two first arc segments, the two first straight line segments are relatively spaced along the second direction, the two first arc segments are relatively spaced along the third direction, 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 a, and satisfies 1mm≤a≤20mm.

4. The sealing ring according to claim 3, characterized in that: The first outer contour includes two second straight line segments and two second arc segments, the two second straight line segments are relatively spaced along the second direction, the two second arc segments are relatively spaced along the third direction, 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 b, and satisfies 1.2mm≤b≤23mm.

5. The sealing ring according to claim 4, characterized in that: The center distance a between the two first arc segments and the center distance b between the two second arc segments satisfy 0.2 mm ≤ ba ≤ 3 mm.

6. The sealing ring according to claim 4, characterized in that: The radius of the first arc segment is R1, which satisfies 1.52 mm ≤ R1 ≤ 10.58 mm; and / or, The radius of the second arc segment is R2, which satisfies 1.82 mm ≤ R2 ≤ 11.58 mm.

7. A cover plate assembly, characterized in that: include: The cover body is provided with a pole hole along a first direction; a pole, passing through the pole hole and having a first pole section, wherein the first pole section has a first cross section perpendicular to the first direction, and the first cross section is a runway-shaped structure; The sealing ring according to any one of claims 1 to 6, wherein the first column section is inserted into the mounting hole.

8. The cover plate assembly according to claim 7, wherein: A gap e between the outer contour of the first cross section and the first inner contour satisfies 0.02 mm ≤ e ≤ 0.08 mm.

9. The cover plate assembly according to claim 8, wherein: The outer contour of the first cross-section includes two third straight line segments and two third arc segments, the two third straight line segments are arranged relatively spaced apart along the second direction, the two third arc segments are arranged relatively spaced apart along the third direction, the two third arc segments are respectively connected to the two ends of the third straight line segments on the same side, and the radius of the third arc segment is r, satisfying 1.5mm≤r≤10.5mm.

10. A battery, characterized in that: A cover plate assembly comprising the cover plate assembly according to any one of claims 7 to 9.

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