Electrochemical devices and electronic devices

Abstract

An electrochemical device and an electronic device, the electrochemical device comprising a housing (10), a first sealing ring (20) and a pole (30), the housing (10) comprising a cover (12) with a through hole (13), the cover (12) comprising a first wall surface (121) and a second wall surface (122); the first sealing ring (20) comprising a first annular surface (21) and a second annular surface (22), the first annular surface (21) being in contact with the first wall surface (121), the first sealing ring (20) being arranged around the hole axis of the through hole (10); the pole (30) comprising a first part (31) and a second part (32), the first part (31) being arranged through the through hole (13), the second part (32) being arranged in contact with the first wall surface (121), and the first annular surface (21) being in contact with the first wall surface (121). The second part (32) is connected to the end of the first part (31) located in the inner cavity of the shell (10), and the second part (32) includes a third annular surface (321) facing the first wall surface (121); the third annular surface (321) includes a first area (3211) that fits the second annular surface (22), and the first area (3211) includes a first edge (3211a) and a second edge (3211b), and the second edge (3211b) is away from the through hole (13) relative to the first edge (3211a), and in a direction parallel to the hole axis, the second edge (3211b) is located between the first edge (3211a) and the second wall surface (122). The second edge can play a certain role in limiting and blocking the first sealing ring, and can inhibit the sliding dislocation of the first sealing ring, thereby improving the sealing reliability of the electrochemical device.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrochemical device and an electronic device. Background Art

[0002] The pole of a steel-shell battery is usually fixed to the cover of the steel-shell battery by riveting. An insulating gasket is sandwiched between the pole and the cover to seal the insulation. However, during the riveting process, the insulating gasket may slide and misalign, resulting in a loose sealing surface, which may easily cause leakage at the sealed connection and pose a safety hazard. On the other hand, in order to ensure sealing during riveting, a larger riveting pressure is usually used. However, excessive riveting pressure may easily cause the pole to turn outward, affecting the sealing area. If the riveting pressure is too small, the sealing interface pressure will be small, which will also affect the sealing effect. Summary of the invention

[0003] The present application aims to provide an electrochemical device and an electronic device, so as to at least improve the sealing effect of the electrochemical device.

[0004] In the first aspect of the present application, an electrochemical device is provided, comprising a shell, a first sealing ring and a pole. The shell comprises a cover body with a through hole, the cover body comprises a first wall surface and a second wall surface arranged oppositely, and the first wall surface faces the inner cavity of the shell. The first sealing ring comprises a first annular surface and a second annular surface arranged oppositely, the first annular surface is attached to the first wall surface, and the first sealing ring is arranged around the hole axis of the through hole. The pole comprises a first part and a second part, the first part is passed through the through hole, the second part is connected to the end of the first part located in the inner cavity of the shell, and the second part comprises a third annular surface facing the first wall surface. Wherein, the third annular surface comprises a first area attached to the second annular surface, the first area comprises a first edge and a second edge arranged oppositely, the second edge is away from the through hole relative to the first edge; when observed in a direction perpendicular to the hole axis of the through hole, in a direction parallel to the hole axis, the second edge is located between the first edge and the second wall surface.

[0005] When the pole is riveted, the second edge can play a certain role in limiting and blocking the first sealing ring, thereby suppressing the sliding dislocation of the first sealing ring. At the same time, the inclined surface from the first edge to the second edge reduces the tangential riveting pressure parallel to the first area, reduces the assembly sliding between the first sealing ring and the pole, and in addition, the inclined surface from the first edge to the second edge suppresses the pole from everting, increases the sealing area, and increases the normal riveting pressure perpendicular to the first area, thereby improving the sealing reliability.

[0006] As a further improvement of the above scheme, there is a first intersection between the first edge and the first plane, there is a second intersection between the second edge and the first plane, the straight line passing through the first intersection and the second intersection has a third intersection with the hole axis, and along the direction of the hole axis, the angle between the ray from the third intersection to the through hole and the ray from the third intersection to the second intersection is α, satisfying 60°≤α≤88°, and the first plane is a plane passing through the hole axis.

[0007] The first area is an inclined surface, and the pole and the first sealing ring are matched with each other through the inclined surfaces, which can increase the sealing area between the first sealing ring and the pole; at the same time, the tangential force parallel to the first area on the first sealing ring is reduced, which can effectively reduce the sliding dislocation of the first sealing ring, and the normal force perpendicular to the first area on the first sealing ring is increased, and the pressure on the sealing interface between the first sealing ring and the pole is greater, thereby improving the sealing reliability between the first sealing ring and the pole.

[0008] As a further improvement of the above solution, 75°≤α≤85° is satisfied. In this case, the first region has a greater inclination, thereby further suppressing the sliding dislocation of the first sealing ring, reducing the tangential force parallel to the first region on the first sealing ring, and increasing the normal force perpendicular to the first region on the first sealing ring, thereby further improving the sealing reliability.

[0009] As a further improvement of the above solution, the first wall surface includes a second area that fits the first annular surface, and the second area includes a third edge and a fourth edge that are arranged opposite to each other, and the fourth edge is away from the through hole relative to the third edge. There is a fourth intersection between the third edge and the first plane, there is a fifth intersection between the fourth edge and the first plane, and a straight line passing through the fourth intersection and the fifth intersection has a sixth intersection with the hole axis. Along the direction of the hole axis, the angle between the ray from the sixth intersection to the through hole and the ray from the sixth intersection to the fifth intersection is β, which satisfies 60°≤β≤88°.

[0010] The second area is an inclined surface, and the first sealing ring and the cover body are matched with an inclined surface, which can increase the sealing area between the first sealing ring and the cover body; at the same time, the tangential force parallel to the second area received by the first sealing ring is reduced, which can effectively reduce the sliding dislocation of the first sealing ring, and the normal force perpendicular to the second area received by the first sealing ring is increased, and the pressure of the sealing interface between the first sealing ring and the cover body is greater, thereby improving the sealing reliability between the first sealing ring and the cover body.

[0011] As a further improvement of the above solution, 75°≤β≤85° is satisfied. In this case, the second region has a greater inclination, thereby further suppressing the sliding dislocation of the first sealing ring, reducing the tangential force parallel to the second region on the first sealing ring, and increasing the normal force perpendicular to the second region on the first sealing ring, thereby further improving the sealing reliability.

[0012] As a further improvement of the above solution, 0.7*(90°-α)≤(90°-β)≤1.2*(90°-α), that is, (1.2α-18°)≤β≤(0.7α+27°) is satisfied. At this time, the inclination of the first area and the second area can be better matched, increasing the pressure of the sealing interface between the first sealing ring and the pole and the cover body, thereby further improving the sealing reliability.

[0013] As a further improvement of the above solution, α≤β, so as to further improve the sealing effect of the first sealing ring.

[0014] As a further improvement of the above scheme, the electrochemical device further comprises a second sealing ring, which is sleeved on the end of the first part away from the second part. The second sealing ring comprises a fourth annular surface, the second wall surface comprises a third region which is in contact with the fourth annular surface, the third region comprises a fifth edge and a sixth edge which are arranged opposite to each other, and the sixth edge is away from the through hole relative to the fifth edge. There is a seventh intersection point between the fifth edge and the first plane, there is an eighth intersection point between the sixth edge and the first plane, and there is a ninth intersection point between the straight line passing through the seventh intersection point and the eighth intersection point and the axis of the hole; along the direction of the axis of the hole, the angle between the ray from the ninth intersection point to the second sealing ring and the ray from the ninth intersection point to the eighth intersection point is λ, which satisfies 60°≤λ≤88°.

[0015] The third area is an inclined surface, and the second sealing ring and the cover body are matched with each other in an inclined surface, which can increase the sealing length of the second sealing ring and the cover body, so as to increase the sealing area of ​​the second sealing ring and the cover body. At the same time, the tangential force parallel to the third area on the second sealing ring is reduced and the normal force perpendicular to the third area is increased, so that the sealing reliability between the second sealing ring and the cover body can be further improved.

[0016] As a further improvement of the above scheme, the first area is an annular area surrounding the axis of the hole, the first edge is the inner circle of the annular area, and the second edge is the outer circle of the annular area; at this time, the first areas around the first part are all upwardly inclined slopes, and no matter in which direction the pole is bent and riveted, the second edge can limit the first sealing ring.

[0017] As a further improvement of the above scheme, the cross section of the third annular surface in the first plane has a first line, the first line includes a first straight line segment, the first straight line segment connects the first intersection and the first part, the angle between the first straight line segment and the hole axis is θ, satisfying 89°≤θ≤91°, the length of the first line is L, the length of the first straight line segment is A, satisfying A≤0.7L. The sealing structure between the second part of the pole and the first sealing ring can be a pure inclined surface or a plane + inclined surface sealing structure, and the plane + inclined surface can also play a certain role in limiting and blocking the first sealing ring to suppress the sliding dislocation of the first sealing ring, and can also increase the sealing area of ​​the first sealing ring, thereby ensuring that the first sealing ring and the pole have better sealing performance.

[0018] As a further improvement of the above solution, the second part also includes a fourth area arranged opposite to the first area, and the fourth area is arranged facing the inner cavity of the shell. The fourth area includes a seventh edge and an eighth edge, and the eighth edge is farther away from the through hole than the seventh edge; when viewed in a direction perpendicular to the hole axis of the through hole, in a direction parallel to the hole axis, the eighth edge is located between the seventh edge and the second wall surface. By stamping the straight periphery of the second part so that the periphery of the second part is tilted upward, the first area and the fourth area can be conveniently formed.

[0019] As a further improvement of the above scheme, the electrochemical device also includes a gasket, which is attached to the surface of the second sealing ring facing away from the inner cavity; the first part includes a bent portion extending out of the through hole, and the bent portion is bent toward the gasket.

[0020] In a second aspect, the present application further provides an electronic device, comprising the electrochemical device as described in any embodiment of the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on the drawings.

[0022] Figure 1 A schematic diagram of the structure of an electrochemical device according to some embodiments of the present application;

[0023] Figure 2 A partial exploded view of a sealing structure according to some embodiments of the present application;

[0024] Figure 3 It is a partial exploded view of a conventional sealing structure;

[0025] Figure 4 A partial exploded view of a sealing structure according to some embodiments of the present application;

[0026] Figure 5 A partial exploded view of a sealing structure according to some embodiments of the present application;

[0027] Figure 6 A partial exploded view of a sealing structure according to some embodiments of the present application;

[0028] Figure 7 A partial exploded view of a sealing structure according to some embodiments of the present application;

[0029] Figure 8 This is a partial exploded view of a sealing structure according to some embodiments of the present application.

[0030] In the figure:

[0031] 10. Shell; 11. Inner cavity; 12. Cover; 121. First wall; 1211. Second region; 1211a. Third edge; 1211b. Fourth edge; 122. Second wall; 1221. Third region; 1221a. Fifth edge; 1221b. Sixth edge; 13. Through hole; 131. Hole axis;

[0032] 20, first sealing ring; 21, first annular surface; 22, second annular surface; 221, second straight line segment;

[0033] 30, pole; 31, first part; 311, bending part; 312, slot; 32, second part; 321, third annular surface; 3211, first area; 3211a, first edge; 3211b, second edge; 3212, first straight line segment; 33, fourth area; 33a, seventh edge; 33b, eighth edge;

[0034] 40a, the first intersection; 40b, the second intersection; 40c, the third intersection; 40d, the fourth intersection; 40e, the fifth intersection; 40f, the sixth intersection; 40g, the seventh intersection; 40h, the eighth intersection; 40i, the ninth intersection; 40j, the tenth intersection; 40k, the eleventh intersection; 40l, the twelfth intersection;

[0035] 50. second sealing ring; 51. fourth annular surface; 52. extension portion;

[0036] 60. Gasket. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" / "fixed to" / "installed on" another element, it can be directly on the other element, or one or more intermediate elements can exist therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can exist therebetween. The terms "upper", "lower", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0040] In this specification, the term "installation" includes fixing or restricting a component or device to a specific position or place by welding, screwing, clamping, bonding, etc. The component or device may remain stationary at the specific position or place or move within a limited range. After being fixed or restricted to a specific position or place, the component or device may or may not be disassembled, which is not limited in the embodiments of the present application.

[0041] The embodiment of the present application proposes an electrochemical device, please refer to Figure 1 The electrochemical device comprises a housing 10, a first sealing ring 20 and a pole 30. In the embodiment of the present application, the electrochemical device is the smallest unit constituting a battery or a battery module, and is a place for realizing the conversion of electrical energy and chemical energy.

[0042] For the housing 10, please refer to Figure 1 and Figure 2The electrochemical device further includes an electrode assembly (not shown in the figure) and an electrolyte (not shown in the figure). The shell 10 is surrounded by an inner cavity 11, and the electrode assembly and the electrolyte are contained in the inner cavity 11 of the shell 10. The shell 10 includes a cover 12, which is covered on the top of the shell 10. The cover 12 is provided with a through hole 13, which is connected to the inner cavity 11 of the shell 10, and the pole 30 can be installed in the through hole 13. The cover 12 includes a first wall 121 and a second wall 122 arranged oppositely, the first wall 121 faces the inner cavity 11 of the shell 10, and the second wall 122 is away from the inner cavity 11 of the shell 10. In this embodiment, the shell 10 is a structure formed by punching a layer of steel sheet, which is usually called a steel shell. Optionally, in other embodiments, the shell 10 can also be made of metal materials such as stainless steel, nickel or copper.

[0043] For the first sealing ring 20, please refer to Figure 1 and Figure 2 The first sealing ring 20 is arranged around the hole axis 131 of the through hole 13, and the first sealing ring 20 is configured to seal the above-mentioned pole 30 and the housing 10. The first sealing ring 20 includes a first annular surface 21 and a second annular surface 22 arranged opposite to each other, the first annular surface 21 is attached to the first wall surface 121 of the cover body 12, and the second annular surface 22 is arranged facing the inner cavity 11 of the housing 10.

[0044] For the pole 30, in this embodiment, the pole 30 can be set as the positive electrode lead-out part of the steel shell battery. The difference between the steel shell battery and the aluminum-plastic film battery is that the steel shell has only one layer of structure, namely the steel sheet, while the aluminum-plastic film has a three-layer structure, namely the nylon layer, the aluminum layer and the PP layer. Because the steel shell has no nylon layer and the PP layer, the steel shell itself can be used as the negative electrode, and the positive electrode can be isolated from the steel shell body by insulating sealing riveting.

[0045] Please refer to Figure 1 and Figure 2The pole 30 includes a first portion 31 and a second portion 32. The first portion 31 is inserted into the through hole 13 of the shell 10, and the second portion 32 is connected to the end of the first portion 31 located in the inner cavity 11 of the shell 10. The second portion 32 is used to connect the electrode assembly in the inner cavity 11 of the shell 10. The first portion 31 includes a bending portion 311 extending out of the through hole 13. When riveting, the bending portion 311 needs to be bent in a direction away from the hole axis 131 to press the first sealing ring 20. The second portion 32 protrudes from the first portion 31 along the first direction X so that the pole 30 is limited when the pole 30 is inserted into the through hole 13. The second portion 32 of the pole 30 includes a third annular surface 321 facing the first wall surface 121. The third annular surface 321 has a first area 3211, and the first area 3211 is used to fit with the second annular surface 22. The first region 3211 includes a first edge 3211a and a second edge 3211b that are arranged opposite to each other, and the second edge 3211b is farther away from the through hole 13 than the first edge 3211a. When viewed in a direction perpendicular to the hole axis 131 of the through hole 13 (a third direction Y), the second edge 3211b is located between the first edge 3211a and the second wall surface 122 in a direction parallel to the hole axis 131 (a second direction Z).

[0046] Please refer to Figure 2 , along the second direction Z, the second edge 3211b is higher than the first edge 3211a. When the bending portion 311 is bent and riveted to press the first sealing ring 20, the second edge 3211b can play a limiting and blocking role on the first sealing ring 20, thereby suppressing the sliding dislocation of the first sealing ring 20. At the same time, the inclined surface from the first edge 3211a to the second edge 3211b reduces the tangential riveting pressure parallel to the first area 3211, and reduces the assembly sliding between the first sealing ring 20 and the pole 30. In addition, the second edge 3211b is higher than the first edge 3211a, which suppresses the eversion of the pole 30 and makes the distance from the first edge 3211a to the second edge 3211b longer, thereby increasing the sealing area and increasing the normal riveting pressure perpendicular to the first area 3211, thereby improving the sealing reliability of the first sealing ring 20.

[0047] Please refer to Figure 3 , Figure 3 The conventional sealing structure of the electrode 30 of the electrochemical device is shown. During assembly and riveting, a force F is applied to the bent portion 311 of the first portion 31 so that the bent portion 311 bends toward the first sealing ring 20. The length of the bonding area between the first sealing ring 20 and the second portion 32 of the electrode 30 is L. 0Since the mating interface between the first sealing ring 20 and the second part 32 is in the horizontal plane, the oblique riveting pressure F is very likely to cause the first sealing ring 20 to slide, resulting in a reduction in the effective sealing area of ​​the first sealing ring 20. The main reason is that the tangential force Fs=F*sinγ of the riveting pressure is too large, where γ is the riveting angle. In addition, the effective normal force Fn=F*cosγ converted by the oblique riveting pressure F is small. If the riveting pressure is increased, there is a risk of causing the pole 30 to turn outward.

[0048] To alleviate the above problems, in one embodiment, please refer to Figure 2 and Figure 4 , the first plane (XZ plane) is a plane passing through the hole axis 131, there is a first intersection 40a between the first edge 3211a and the first plane, there is a second intersection 40b between the second edge 3211b and the first plane, and there is a third intersection 40c between the straight line passing through the first intersection 40a and the second intersection 40b and the hole axis 131 of the through hole 13. Along the direction of the hole axis 131, the angle between the ray from the third intersection 40c to the through hole 13 and the ray from the third intersection 40c to the second intersection 40b is α, satisfying 60°≤α≤88°. In this embodiment, the first area 3211 is an inclined surface, the pole 30 and the first sealing ring 20 are matched with an inclined surface, and the sealing length between the first sealing ring 20 and the pole 30 is L 1 =L 0 / cos(90°-α), i.e. L 1 >L 0 , which can increase the sealing area between the first sealing ring 20 and the pole 30. At the same time, the tangential force Fs on the first sealing ring 20 1 =F*sin(90°-α), where (90°-α)<γ, that is, Fs 1 <Fs, the tangential force is reduced, which can effectively reduce the sliding dislocation of the first sealing ring 20. In addition, since the riveting pressure remains unchanged, the normal force Fn on the first sealing ring 20 is 1 =F*cos(90°-α), that is, Fn 1 >Fn, the normal force increases, and the pressure of the sealing interface is greater, thereby improving the sealing reliability between the first sealing ring 20 and the pole 30. In some embodiments, to further improve the sealing reliability between the first sealing ring 20 and the pole 30, 75°≤α≤85° is satisfied.

[0049] According to some embodiments of this application, please refer to Figure 5The first wall surface 121 includes a second area 1211 that is in contact with the first annular surface 21. The second area 1211 includes a third edge 1211a and a fourth edge 1211b that are arranged opposite to each other. The fourth edge 1211b is away from the through hole 13 relative to the third edge 1211a. There is a fourth intersection 40d between the third edge 1211a and the first plane, there is a fifth intersection 40e between the fourth edge 1211b and the first plane, and a straight line passing through the fourth intersection 40d and the fifth intersection 40e has a sixth intersection 40f with the hole axis 131. Along the direction of the hole axis 131, the angle between the ray from the sixth intersection 40f to the through hole 13 and the ray from the sixth intersection 40f to the fifth intersection 40e is β, which satisfies 60°≤β≤88°. In this embodiment, the second area 1211 is an inclined surface, and the first sealing ring 20 and the cover body 12 are matched with an inclined surface, which can increase the sealing length of the first sealing ring 20 and the cover body 12 to increase the sealing area of ​​the first sealing ring 20 and the cover body 12. At the same time, the tangential force between the cover body 12 and the first sealing ring 20 is reduced and the normal force is increased, thereby further improving the sealing reliability between the first sealing ring 20 and the cover body 12. In some embodiments, in order to further improve the sealing reliability between the first sealing ring 20 and the cover body 12, 75°≤β≤85° is satisfied. In other embodiments, the value range of β can also be 0.7*(90°-α)≤(90°-β)≤1.2*(90°-α), that is, the value of β can also be determined according to (1.2α-18°)≤β≤(0.7α+27°). At this time, the inclination of the first area 3211 and the second area 1211 can be better matched, increasing the pressure of the sealing interface between the first sealing ring 20 and the pole 30 and the cover 12, thereby further improving the sealing reliability. Further, in order to improve the sealing effect of the first sealing ring 20, the above two angles satisfy α≤β. When the angle α is less than the angle β, the first area 3211 is tilted upward at a larger angle, so that the second part 32 of the pole 30 and the first sealing ring 20 are abutted against each other.

[0050] According to some embodiments of this application, please refer to Figure 6The battery electrochemical device further comprises a second sealing ring 50, which is sleeved on the end of the first part 31 away from the second part 32. The second sealing ring 50 comprises a fourth annular surface 51, the second wall surface 122 comprises a third region 1221 which is in contact with the fourth annular surface 51, the third region 1221 comprises a fifth edge 1221a and a sixth edge 1221b which are arranged opposite to each other, and the sixth edge 1221b is away from the through hole 13 relative to the fifth edge 1221a. There is a seventh intersection 40g between the fifth edge 1221a and the first plane, there is an eighth intersection 40h between the sixth edge 1221b and the first plane, and there is a ninth intersection 40i between the straight line passing through the seventh intersection 40g and the eighth intersection 40h and the hole axis 131. Along the direction of the hole axis 131, the angle between the ray from the ninth intersection 40i to the second sealing ring 50 and the ray from the ninth intersection 40i to the eighth intersection 40h is λ, which satisfies 60°≤λ≤88°. The first sealing ring 20 is used to isolate and seal the inner wall of the cover 12 from the pole 30, and the second sealing ring 50 isolates and seals the cover 12 from the pole 30 on the outer surface of the cover 12, wherein the second sealing ring 50 also includes an extension portion 52, which extends into the through hole 13 and abuts between the first portion 31 and the cover 12 to isolate the first portion 31 from the cover 12. When the bending portion 311 is bent and riveted to press the second sealing ring 50, the extension portion 52 can also limit the second sealing ring 50 to alleviate the sliding dislocation of the second sealing ring 50 due to riveting. Optionally, the first sealing ring 20 is also provided with an extension portion 52.

[0051] In this embodiment, the third area 1221 is an inclined surface, and the second sealing ring 50 and the cover body 12 are matched with an inclined surface, which can increase the sealing length of the second sealing ring 50 and the cover body 12 to increase the sealing area of ​​the second sealing ring 50 and the cover body 12. Similarly, the tangential force between the cover body 12 and the second sealing ring 50 is reduced and the normal force is increased, thereby further improving the sealing reliability between the second sealing ring 50 and the cover body 12. In some embodiments, (1.2α-18°)≤λ≤(0.7α+27°) is satisfied. In order to facilitate the third area 1221 to hold and limit the second sealing ring 50, the angle λ can also be set to be smaller than the angle β.

[0052] According to some embodiments of the present application, the first area 3211 is an annular area surrounding the hole axis 131, the first edge 3211a is the inner ring of the annular area, and the second edge 3211b is the outer ring of the annular area. In this implementation, the first area 3211 around the first part 31 is an upwardly inclined slope, and no matter in which direction the bending portion 311 is bent and riveted, the second edge 3211b can limit the first sealing ring 20. In actual operation, the bending portion 311 is usually bent in a direction away from the hole axis 131. Therefore, in some optional embodiments, only on one side of the bending direction of the bending portion 311, when observed in a direction perpendicular to the hole axis 131, in a direction parallel to the hole axis 131, the second edge 3211b is located between the first edge 3211a and the second wall 122.

[0053] Please refer to Figure 7 Optionally, the cross section of the third annular surface 321 and the first plane has a first line, the first line includes a first straight line segment 3212, the first straight line segment 3212 connects the first intersection 40a and the first part 31, the angle between the first straight line segment 3212 and the hole axis 131 is θ, satisfying 89°≤θ≤91°. The length of the first line is L, the length of the first straight line segment 3212 is A, satisfying A≤0.7L. The sealing structure between the second part 32 of the pole 30 and the first sealing ring 20 can be a pure inclined surface sealing structure or a plane + inclined surface sealing structure, the plane is the first straight line segment 3212, its length is A, the length of the inclined surface is M, L=A+M, the second annular surface 22 that fits the third annular surface 321 includes a second straight line segment 221 in the cross section, the second straight line segment 221 fits the first straight line segment 3212, and the length of the second straight line segment 221 can also be set to A.

[0054] According to some embodiments of this application, please refer to Figure 8 , the second portion 32 further includes a fourth region 33 disposed opposite to the first region 3211, and the fourth region 33 is disposed facing the inner cavity 11 of the housing 10. The fourth region 33 includes a seventh edge 33a and an eighth edge 33b, and the eighth edge 33b is away from the through hole 13 relative to the seventh edge 33a. Observed in a direction perpendicular to the hole axis 131 of the through hole 13, in a direction parallel to the hole axis 131, the eighth edge 33b is located between the seventh edge 33a and the second wall surface 122. The periphery of the second portion 32 can be arranged to be tilted upward by stamping the periphery of the straight second portion 32, that is, the fourth region 33 at the bottom of the pole 30 is an inclined surface. This solution can conveniently form the first region 3211 and the fourth region 33, and can reduce the material of the pole 30, thereby reducing the cost.

[0055] There is a tenth intersection 40j between the seventh edge 33a and the first plane, there is an eleventh intersection 40k between the eighth edge 33b and the first plane, there is a twelfth intersection 40l between the straight line passing through the tenth intersection 40j and the eleventh intersection 40k and the hole axis 131, and along the direction of the hole axis 131, the angle between the ray from the twelfth intersection 40l to the through hole 13 and the ray from the twelfth intersection 40l to the eleventh intersection 40k is δ, wherein the range of angle δ is 60°≤δ≤88°. In some embodiments, δ≤α.

[0056] According to some embodiments of this application, please refer to Figure 2 The electrochemical device further comprises a gasket 60, which is attached to the surface of the second sealing ring 50 facing away from the inner cavity 11, and the bent portion 311 is bent toward the gasket 60. The gasket 60 can protect the second sealing ring 50 to prevent the second sealing ring 50 from being directly riveted and damaged by the bent portion 311. Optionally, a slot 312 is provided on the first portion 31, and the gasket 60 can be directly snapped into the slot 312, which is convenient for positioning and installing the gasket 60 on the one hand, and also convenient for bending the bent portion 311 on the other hand.

[0057] In the embodiment of the present application, by setting the first area 3211 as an inclined surface, the pole 30 and the first sealing ring 20 are matched with the inclined surface, which can increase the sealing area between the first sealing ring 20 and the pole 30; similarly, the tangential force on the first sealing ring 20 is reduced, which can effectively reduce the sliding dislocation of the first sealing ring 20, and the normal force of the first sealing ring 20 is increased, and the pressure of the sealing interface between the first sealing ring 20 and the pole 30 is greater, thereby improving the sealing reliability of the first sealing ring 20. Based on the same inventive concept, the cover body 12 and the first sealing ring 20 are matched with the inclined surface, and the second sealing ring 50 and the cover body 12 are matched with the inclined surface. The three inclined surface matching can further improve the reliability of the sealing of the pole 30.

[0058] The steel-shell lithium-ion battery is used as an example to conduct a verification test of the sealing effect, wherein both sides of the cover of the steel-shell lithium-ion battery are planar structures, and the riveting pressure is applied at an angle of 45° to the hole axis direction during the riveting process. The sealing length L between the first sealing ring 20 on one side of the pole 30 and the second part 32 of the pole 30 is 2 mm. The difference between Examples 1 to 8 and Comparative Example 1 is that the periphery of the second part 32 of the pole 30 is bent upward in whole or in part by stamping to form a pure inclined surface or a plane + inclined surface sealing structure, wherein the length of the plane area is A. The method for verifying the sealing effect is to store the steel-shell lithium-ion battery in a high temperature and high humidity environment of 60°C and 90% relative humidity for 7 days. If there is no rupture and leakage, it is not failed and passes the test, otherwise it is failed and fails the test. The number of samples of the steel-shell lithium-ion battery in each test is set to 5, and the failure rate is required to be within 20%. The test results are shown in Table 1 below.

[0059] Table 1 Test data of different sealing structures and sizes

[0060] Sealed structure A Angle α Number of trials Number of failures Failure rate Example 1 Pure Bevel 0 85° 5 0 0％ Example 2 Plane + Inclined 0.1L 85° 5 0 0％ Example 3 Plane + Inclined 0.3L 85° 5 0 0％ Example 4 Plane + Inclined 0.5L 85° 5 0 0％ Example 5 Plane + Inclined 0.7L 85° 5 1 20％ Example 6 Pure Bevel 0 88° 5 1 20％ Example 7 Pure Bevel 0 75° 5 0 0％ Example 8 Pure Bevel 0 60° 5 1 20％ Comparative Example 1 Pure plane L 90° 5 2 40％

[0061] According to the test results, it can be found that steel-shell lithium-ion batteries using a pure bevel or plane + bevel sealing structure have better sealing effects and a lower failure rate when stored in a high temperature and high humidity environment, while steel-shell lithium-ion batteries using a traditional pure flat sealing structure have a higher failure rate and cannot meet the requirements.

[0062] It can be further seen from the test verification results corresponding to Table 1 that when the width of the plane area A≤0.5L and 75°≤α≤85°, the failure rate of steel-shell lithium-ion batteries stored in a high temperature and high humidity environment is further significantly reduced, and the sealing performance is significantly improved. Therefore, the sealing reliability of steel-shell lithium-ion batteries within this set range of A and α has obvious advantages.

[0063] An embodiment of the present application further provides an electronic device, comprising the electrochemical device described in any of the above embodiments.

[0064] The embodiment of the present application provides an electronic device using an electrochemical device as a power source, and the electronic device may be, but is not limited to, a Bluetooth earphone, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrochemical device, It is characterized in that include: A shell, comprising a cover body with a through hole, the cover body comprising a first wall surface and a second wall surface arranged opposite to each other, the first wall surface facing the inner cavity of the shell; A first sealing ring, comprising a first annular surface and a second annular surface arranged opposite to each other, wherein the first annular surface is attached to the first wall surface, and the first sealing ring is arranged around the hole axis of the through hole; A pole, used for forming with the shell by riveting, the pole comprising a first part and a second part, the first part is passed through the through hole, the second part is connected to the end of the first part located in the inner cavity of the shell, and the second part comprises a third annular surface facing the first wall surface; In which, the third annular surface includes a first area that is in contact with the second annular surface, the first area is a slope, and the first area includes a first edge and a second edge that are arranged opposite to each other, and the second edge is away from the through hole relative to the first edge; when observed in a direction perpendicular to the hole axis of the through hole, in a direction parallel to the hole axis, the second edge is located between the first edge and the second wall surface.

2. The electrochemical device according to claim 1, It is characterized in that There is a first intersection between the first edge and the first plane, there is a second intersection between the second edge and the first plane, there is a third intersection between the straight line passing through the first intersection and the second intersection and the axis of the hole, along the direction of the axis of the hole, the angle between the ray from the third intersection to the through hole and the ray from the third intersection to the second intersection is α, satisfying 60°≤α≤88°, and the first plane is a plane passing through the axis of the hole.

3. The electrochemical device according to claim 2, It is characterized in that Satisfies 75°≤α≤85°.

4. The electrochemical device according to claim 2, It is characterized in that The first wall surface includes a second area that is in contact with the first annular surface, the second area includes a third edge and a fourth edge that are arranged opposite to each other, and the fourth edge is farther away from the through hole than the third edge; There is a fourth intersection between the third edge and the first plane, there is a fifth intersection between the fourth edge and the first plane, the straight line passing through the fourth intersection and the fifth intersection has a sixth intersection with the hole axis, and along the direction of the hole axis, the angle between the ray from the sixth intersection to the through hole and the ray from the sixth intersection to the fifth intersection is β, satisfying 60°≤β≤88°.

5. The electrochemical device according to claim 4, It is characterized in that Satisfies 75°≤β≤85°.

6. The electrochemical device according to claim 4, It is characterized in that (1.2α-18°)≤β≤(0.7α+27°)。 7. The electrochemical device according to claim 6, It is characterized in that α≤β。 8. The electrochemical device according to claim 3, It is characterized in that The electrochemical device further comprises a second sealing ring, wherein the second sealing ring is sleeved on an end of the first part away from the second part; The second sealing ring includes a fourth annular surface, the second wall surface has a third area that fits the fourth annular surface, the third area includes a fifth edge and a sixth edge that are arranged opposite to each other, and the sixth edge is farther away from the through hole than the fifth edge; There is a seventh intersection point between the fifth edge and the first plane, there is an eighth intersection point between the sixth edge and the first plane, and a straight line passing through the seventh intersection point and the eighth intersection point has a ninth intersection point with the hole axis; Along the direction of the hole axis, an angle λ between a ray from the ninth intersection to the second sealing ring and a ray from the ninth intersection to the eighth intersection is satisfied, satisfying 60°≤λ≤88°.

9. The electrochemical device according to claim 2, It is characterized in that At least one of the following conditions is met: (1) The first area is an annular area surrounding the hole axis, the first edge is an inner circle of the annular area, and the second edge is an outer circle of the annular area; (2) The cross section of the third annular surface in the first plane has a first line, the first line includes a first straight line segment, the first straight line segment connects the first intersection and the first part, the angle between the first straight line segment and the hole axis is θ, satisfying 89°≤θ≤91°, the length of the first line is L, the length of the first straight line segment is A, satisfying A≤0.7L.

10. The electrochemical device according to claim 1, It is characterized in that The second portion further includes a fourth region disposed opposite to the first region, and the fourth region is disposed facing the inner cavity of the shell; The fourth region includes a seventh edge and an eighth edge, the eighth edge being farther away from the through hole relative to the seventh edge; when observed in a direction perpendicular to the hole axis of the through hole, in a direction parallel to the hole axis, the eighth edge is located between the seventh edge and the second wall surface.

11. The electrochemical device according to claim 8, It is characterized in that The electrochemical device further comprises a gasket, which is arranged on a surface of the second sealing ring facing away from the inner cavity; The first portion includes a bent portion extending out of the through hole, and the bent portion is bent toward the gasket.

12. An electronic device, It is characterized in that An electrochemical device comprising any one of claims 1 to 11.

Images