Battery

Abstract

The present invention relates to the technical field of energy batteries, and discloses a battery, which includes a housing, a positive electrode post, an insulating and sealing assembly, and a riveting block. The positive electrode post is installed in the installation hole of the housing. One end of the positive electrode post is provided with a limiting protrusion, and the other end is provided with a riveting rib. An upper insulating member is arranged between the limiting protrusion and the outer surface of the housing. A sealing member is arranged between the outer wall of the positive electrode post and the inner wall of the installation hole. A lower insulating member is arranged on the inner surface of the housing. The riveting block is arranged on the outer periphery of the riveting rib. The riveting block includes a first riveting portion and a second riveting portion which are arranged in an upper and lower step manner. The first riveting portion penetrates through the lower insulating member and abuts against the sealing member, and the second riveting portion abuts against the lower insulating member. The riveting block can enhance the structural strength of the positive electrode side of the battery cell, reduce the risk of the riveting rib fracturing the lower insulating member. The first riveting portion penetrates through the lower insulating member and abuts against the sealing member, avoiding the lower insulating member, improving the space utilization rate of the battery in the height direction. The cooperation between the second riveting portion and the lower insulating member ensures the insulation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of energy batteries, and particularly relates to a battery. Background Art

[0002] Energy batteries such as lithium and lithium iron phosphate have become one of the important research directions for power batteries used in new energy vehicles due to their high energy density, high safety and low cost advantages. The battery mainly includes a housing, a wound core, positive and negative covers, a positive electrode post and positive and negative current collectors. The first end of the housing is open, and an installation hole is provided on the end surface of the second end. The wound core is arranged inside the housing. The negative cover is hermetically covered on the first end of the housing. The positive electrode post is installed in the installation hole. The positive current collector is used to connect the positive electrode tab of the wound core and the positive electrode post.

[0003] In the prior art, to ensure the insulation and sealing between the positive electrode post and the housing and their reliable connection, an insulating layer is respectively provided on the outer surface and the inner surface of the housing to insulate the outer end and the inner end of the positive electrode post. At the same time, a sealing ring is provided in the installation hole to seal the gap between the positive electrode post and the housing. The inner end of the positive electrode post is provided with a riveting rib that cooperates with the insulating layer on the inner surface of the housing to provide a support force point when the positive electrode post is riveted. However, due to the presence of inner and outer insulating layers, sealing rings and riveting ribs and other multiple structures between the positive electrode post and the housing, the space in the height direction of the battery is occupied, affecting the utilization of the effective space inside the battery. At the same time, since the riveting rib is stressed, it will squeeze the insulating layer on the inner surface of the housing, easily causing the extrusion to rupture. Summary of the Invention

[0004] In view of this, the present invention provides a battery to solve the problems that the installation between the positive electrode post and the housing in the existing battery occupies the space in the height direction of the battery, affecting the utilization of the effective space inside the battery, and at the same time, the riveting rib will squeeze the insulating layer on the inner surface of the housing, easily causing the extrusion to rupture.

[0005] The present invention provides a battery, including a housing, a positive electrode post, an insulating and sealing assembly and a riveting block. The housing is provided with an installation hole. The positive electrode post is installed in the installation hole. One end of the positive electrode post located outside the housing is provided with a limit protrusion. One end of the positive electrode post located inside the housing is provided with a riveting rib. The limit protrusion and the riveting rib respectively limit the two ends of the positive electrode post. The insulating and sealing assembly includes an upper insulating member, a sealing member and a lower insulating member. The upper insulating member is arranged between the limit protrusion and the outer surface of the housing. The sealing member is abutted and arranged between the outer wall of the positive electrode post and the inner wall of the installation hole. The lower insulating member is arranged on the inner surface of the housing. The riveting block is arranged on the outer circumference of the riveting rib. The riveting block includes a first riveting portion and a second riveting portion arranged in an upper and lower step manner. The first riveting portion passes through the lower insulating member and abuts against the sealing member. The second riveting portion abuts against the lower insulating member.

[0006] Beneficial effect: The two ends of the positive electrode column are limited by the limiting protrusion and the rivet rib respectively to prevent the positive electrode column from slipping out of the mounting hole from the two ends; the upper insulating part is arranged between the limiting protrusion and the outer surface of the shell, the sealing part is abutted between the outer wall of the positive electrode column and the inner wall of the mounting hole, and the lower insulating part is arranged on the inner surface of the shell, thereby realizing the mutually insulated and sealed fixed connection between the positive electrode column and the shell, and the rivet block is arranged on the periphery of the rivet rib, which can enhance the structural strength of the positive electrode side of the battery cell and reduce the risk of fracturing of the lower insulating part by the rivet rib during riveting; the first riveted part of the rivet block passes through the lower insulating part and abuts against the sealing part, avoiding the lower insulating part, making the structural arrangement more compact and improving the space utilization of the battery in the height direction; the cooperation between the second riveted part of the rivet block and the lower insulating part ensures the insulation performance.

[0007] In an optional embodiment, a first deformation relief groove is provided on a surface of the lower insulating member facing the shell, and the first deformation relief groove is at least partially located below the sealing member.

[0008] Beneficial effect: By setting a first deformation release groove on the lower insulating part, when the seal is subjected to the abutment force of the rivet block, the seal itself will be squeezed and deformed toward the first deformation release groove, thereby releasing the deformation of the seal. On the one hand, it avoids the failure of the seal due to pressure cracking. On the other hand, the extension deformation of the seal also increases the sealing area of the seal, thereby improving the sealing performance.

[0009] In an optional embodiment, a second deformation release groove is further provided on a side of the lower insulating member facing the shell, and the second deformation release groove is arranged corresponding to the second riveted portion.

[0010] Beneficial effect: When the second riveted part is subjected to force to squeeze the lower insulating part, the second deformation release groove can make the lower insulating part deform along the force in the second deformation release groove, thereby releasing the extrusion deformation of the lower insulating part, avoiding the lower insulating part from being cracked and failing due to excessive pressure, and protecting the lower insulating part.

[0011] In an optional embodiment, the first deformation relief groove is set as an annular groove along the circumference of the sealing member; and / or the second deformation relief groove is opened along the length direction of the lower insulating member, and the second deformation relief groove is connected to the first deformation relief groove.

[0012] Beneficial effect: The annular groove can make the seal deform toward the annular groove in its circumference when it is squeezed, thereby increasing the amount of deformation release space and reducing the risk of seal fracturing as much as possible. The second deformation release groove is opened along the length direction of the lower insulating part so that the extrusion deformation of the lower insulating part in the length direction by the second riveted part can be effectively released, thereby reducing the risk of lower insulating part fracturing as much as possible.

[0013] In an alternative embodiment, the seal includes a first sealing portion and a second sealing portion. The first sealing portion is abutted and disposed between the outer surface of the housing and the bottom surface of the limiting protrusion, and the end of the first sealing portion abuts against the upper insulating member. The second sealing portion is abutted and disposed between the outer wall of the positive electrode post and the inner wall of the mounting hole, and the bottom of the second sealing portion abuts against the first riveting portion. And at least part of the first deformation release groove is located below the second sealing portion.

[0014] Advantageous effects: The first sealing portion is abutted and disposed between the outer surface of the housing and the bottom surface of the limiting protrusion, so as to seal between the outer surface of the housing and the bottom surface of the limiting protrusion. The second sealing portion is abutted and disposed between the outer wall of the positive electrode post and the inner wall of the mounting hole, so as to seal between the outer wall of the positive electrode post and the inner wall of the mounting hole. At the same time, the end of the first sealing portion abuts against the upper insulating member, and the bottom of the second sealing portion abuts against the first riveting portion, which can enhance the sealing performance.

[0015] In an alternative embodiment, a first sealing surface and a second sealing surface which are arranged in a stepped manner up and down are provided on the surface of the limiting protrusion facing the housing. The first sealing portion is sealingly attached to the first sealing surface, and the second sealing portion is sealingly attached to the second sealing surface; and / or, the upper insulating member includes a first insulating portion and a second insulating portion. The first insulating portion covers the outer periphery of the limiting protrusion, and the second insulating portion is disposed between the bottom surface of the limiting protrusion and the outer surface of the housing, and the inner end of the second insulating portion abuts against the first sealing portion.

[0016] Advantageous effects: By providing upper and lower double surfaces (the first sealing surface and the second sealing surface) on the surface of the limiting protrusion facing the housing, and the double surfaces are respectively matched with the first sealing portion and the second sealing portion, so as to realize the stepped sealing between the positive electrode post and the housing, and the sealing performance is excellent; the first insulating portion covers the outer periphery of the limiting protrusion, which can protect the limiting protrusion from being damaged by collision. The second insulating portion is disposed between the bottom surface of the limiting protrusion and the outer surface of the housing, so as to realize the insulation between the limiting protrusion and the housing.

[0017] In an alternative embodiment, a limiting groove is provided on the outer surface of the housing along the circumferential direction of the mounting hole. Both the second insulating portion and the first sealing portion are disposed in the limiting groove.

[0018] Advantageous effects: The limiting groove can be used for positioning and installing the second insulating portion and the first sealing portion, and improving the installation accuracy of them on the housing.

[0019] In an alternative embodiment, one end of the positive electrode post located inside the housing is provided with a groove, and the circumferential direction of the groove forms the riveting rib. The battery further includes a positive current collector plate disposed inside the housing. A boss is provided on a surface of the positive current collector plate facing the positive electrode post. The boss is snap-fitted into the groove, and the top surface of the boss is adapted to be welded in cooperation with the bottom surface of the groove.

[0020] Beneficial effects: By snap-fitting the boss of the positive current collector plate into the groove of the positive electrode post and welding the mating portion of the top surface of the boss and the bottom surface of the groove, the welding and fixing of the two are realized. The mating of the top surface of the boss and the bottom surface of the groove increases the welding area, and the groove reduces the welding thickness of the positive electrode post, thereby reducing the welding difficulty, improving the assembly efficiency, reducing the contact internal resistance, increasing the over-current capacity of the battery, and improving the product yield.

[0021] In an alternative embodiment, a support rib is provided on a surface of the lower insulating member away from the housing. The support rib abuts against the positive current collector plate to play a role in supporting and positioning the installation of the positive current collector plate.

[0022] In an alternative embodiment, a chamfer is provided at an opening of the groove, and the boss is snap-fitted into the groove through the chamfer; and / or, the battery further includes a battery stack and a negative current collector plate. The battery stack is disposed inside the housing. The positive tab of the battery stack is connected to the positive current collector plate, and the negative current collector plate is connected to the negative tab of the battery stack and the housing.

[0023] Beneficial effects: By chamfering the opening of the groove, the boss can be easily snap-fitted into the groove through the chamfer, reducing the assembly difficulty between the two and improving the assembly efficiency; the battery stack is used to store and release electric energy. The positive current collector plate is connected to the positive tab of the battery stack to realize the collection and extraction of the positive current of the battery stack through the positive current collector plate. The negative current collector plate can collect the negative current of the battery stack and introduce it to the housing. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the battery according to an embodiment of the present invention;

[0026] Figure 2 It is a top view of the battery according to an embodiment of the present invention;

[0027] Figure 3 is Figure 2 a sectional view taken along the A-A direction in

[0028] Figure 4 a partially enlarged sectional view of the battery according to an embodiment of the present invention;

[0029] Figure 5 a sectional view of the positive electrode post according to an embodiment of the present invention;

[0030] Figure 6 a perspective view of the positive electrode post according to an embodiment of the present invention;

[0031] Figure 7 a perspective view of the seal according to an embodiment of the present invention;

[0032] Figure 8 a sectional view of the seal according to an embodiment of the present invention;

[0033] Figure 9 a sectional view of the positive current collector plate according to an embodiment of the present invention;

[0034] Figure 10 a perspective view of the positive current collector plate according to an embodiment of the present invention;

[0035] Figure 11 a perspective view of the riveting block according to an embodiment of the present invention;

[0036] Figure 12 a sectional view of the riveting block according to an embodiment of the present invention.

[0037] Explanation of reference numerals:

[0038] 1. Housing; 2. Positive electrode post; 21. Groove; 211. Rounded chamfer; 22. Riveting rib; 23. Limit projection; 231. First sealing surface; 232. Second sealing surface; 3. Upper insulating member; 31. First insulating portion; 32. Second insulating portion; 4. Seal; 41. First sealing portion; 42. Second sealing portion; 5. Lower insulating member; 51. First deformation release groove; 52. Second deformation release groove; 53. Support rib; 6. Riveting block; 61. First riveting portion; 62. Second riveting portion; 63. Riveting hole; 631. Installation step; 7. Positive current collector plate; 71. Boss; 8. Electrode group; 9. Negative current collector plate; 10. Negative electrode cover plate. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] As Figures 1 to 12 shown, according to an embodiment of the present invention, on the one hand, a battery is provided, which includes a housing 1, a positive electrode post 2, an insulating seal 4, and a riveting block 6. Among them, the housing 1 is provided with a mounting hole, the positive electrode post 2 is installed in the mounting hole, a limiting protrusion 23 is provided at one end of the positive electrode post 2 located outside the housing 1, and a riveting rib 22 is provided at one end of the positive electrode post 2 located inside the housing 1. The limiting protrusion 23 and the riveting rib 22 respectively limit the two ends of the positive electrode post 2. The insulating seal assembly includes an upper insulating member 3, a seal 4, and a lower insulating member 5. The upper insulating member 3 is disposed between the limiting protrusion 23 and the outer surface of the housing 1, the seal 4 is abutted and disposed between the outer wall of the positive electrode post 2 and the inner wall of the mounting hole, the lower insulating member 5 is disposed on the inner surface of the housing 1, and the riveting block 6 is disposed on the outer periphery of the riveting rib 22. The riveting block 6 includes a first riveting portion 61 and a second riveting portion 62 which are arranged in an up-and-down step manner. The first riveting portion 61 passes through the lower insulating member 5 and abuts against the seal 4, and the second riveting portion 62 abuts against the lower insulating member 5.

[0041] In the battery of this embodiment, the two ends of the positive electrode post 2 are respectively limited by the limiting protrusion 23 and the riveting rib 22 to prevent the positive electrode post 2 from coming out of the mounting hole at both ends. The upper insulating member 3 is disposed between the limiting protrusion 23 and the outer surface of the housing 1, the seal 4 is abutted and disposed between the outer wall of the positive electrode post 2 and the inner wall of the mounting hole, and the lower insulating member 5 is disposed on the inner surface of the housing 1, so as to realize the mutually insulated and sealed fixed connection between the positive electrode post 2 and the housing 1. Moreover, the riveting block 6 is disposed on the outer periphery of the riveting rib 22, which can enhance the structural strength of the positive electrode side of the battery cell and reduce the risk of cracking of the lower insulating member 5 by the riveting rib 22 during riveting. The first riveting portion 61 of the riveting block 6 passes through the lower insulating member 5 and abuts against the seal 4, avoiding the lower insulating member 5, with a more compact structural layout and improved space utilization rate of the battery in the height direction. The cooperation between the second riveting portion 62 of the riveting block 6 and the lower insulating member 5 ensures the insulation performance.

[0042] In this embodiment, the housing 1 is a hollow cylindrical outer shell with one end closed and the other end open. The mounting hole is provided on the closed end surface, the positive electrode post 2 is insulated and sealed in the mounting hole, and a negative electrode cover plate 10 is suitable for being disposed at the open end, so as to realize the sealed assembly of the housing 1.

[0043] The positive electrode post 2 is used to lead out the positive current. Specifically, in terms of the set shape, the mounting hole is a circular hole, and the positive electrode post 2 is correspondingly a circular column. The limiting protrusion 23 and the riveting rib 22 can be formed by stamping or extrusion after the positive electrode post 2 is inserted into the mounting hole. This embodiment does not make specific restrictions.

[0044] In this embodiment, one end of the positive electrode post 2 located inside the housing 1 is provided with a groove 21. The circumferential direction of the groove 21 forms a riveting rib 22. The riveting rib 22 can play a role in force support during the welding of the positive electrode post 2 while limiting.

[0045] The riveting block 6 is arranged on the outer circumference of the riveting rib 22, which extends the circumferential area of the riveting rib 22, increases the force-bearing area between the riveting rib 22 and the upper insulating part 3, thereby reducing the risk of cracking the upper insulating part 3 caused by the instantaneous impact force during riveting. At the same time, the riveting block 6 also enhances the structural strength at the riveting rib 22, and further enhances the structural strength on the positive electrode side of the battery cell.

[0046] Specifically, the riveting rib 22 is an annular rib arranged along the circumferential direction of the groove 21, and the riveting block 6 is also an annular block with a riveting hole 63 in the middle. The riveting block 6 is sleeved on the outer circumference of the positive electrode post 2 through the riveting hole 63, and an installation step 631 is provided on the inner wall of the riveting hole 63. The riveting rib 22 is clamped on the installation step 631, so as to ensure the reliable cooperation between the riveting block 6 and the riveting rib 22.

[0047] In this embodiment, the diameter of the first riveting part 61 is smaller than the diameter of the second riveting part 62, and the outer end of the first riveting part 61 is connected to the inner end of the second riveting part 62. The installation step 631 is formed at the connection of the first riveting part 61 and the second riveting part 62. During installation, first, the riveting block 6 is sleeved on the outer circumference of the groove 21 of the positive electrode post 2 through the riveting hole 63, and the riveting rib 22 in the circumferential direction of the groove 21 is bent outward to form an annular rib, and the annular rib is stuck in the installation step 631, so that the first riveting part 61 is tightly pressed against the sealing part 4.

[0048] The battery of this embodiment further includes a positive electrode current collector plate 7 arranged inside the housing 1. One side of the positive electrode current collector plate 7 facing the positive electrode post 2 is provided with a convex platform 71. The convex platform 71 is clamped in the groove 21, and the top surface of the convex platform 71 is suitable for welding with the bottom surface of the groove 21. By clamping the convex platform 71 of the positive electrode current collector plate 7 in the groove 21 of the positive electrode post 2 and welding the matching part of the top surface of the convex platform 71 and the bottom surface of the groove 21, the welding and fixing of the two are realized. The matching of the top surface of the convex platform 71 and the bottom surface of the groove 21 increases the welding area, and the groove 21 reduces the welding thickness of the positive electrode post 2, thereby reducing the welding difficulty, improving the assembly efficiency, reducing the contact internal resistance, increasing the over-current capacity of the battery, and improving the product yield.

[0049] The positive electrode current collector 7 is used for collecting the positive current of the battery. The positive electrode current collector 7 can be set as a circular disk, and a boss 71 is provided in the middle of the circular disk. The boss 71 can cooperate with the groove 21 on the positive electrode column 2. In this embodiment, the groove 21 is a cylindrical groove 21, and the boss 71 is a hollow circular platform, which can be formed by stamping or extruding the middle of the positive electrode current collector 7. The size of the circular platform is smaller than the inner diameter of the groove 21, so that the boss 71 can be snapped into the groove 21.

[0050] Furthermore, the opening of the groove 21 is provided with a rounded corner 211, and the boss 71 is snapped into the groove 21 through the rounded corner 211. By performing the rounded corner 211 on the opening of the groove 21, the boss 71 can be easily snapped into the groove 21 through the rounded corner 211, thereby reducing the assembly difficulty of the two and improving the assembly efficiency.

[0051] It can be understood that after the rivet rib 22 is installed on the installation step 631 in the rivet block 6, the side of the rivet rib 22 away from the limiting protrusion 23 and the side of the second rivet part 62 away from the limiting protrusion 23 are flush, and both are in contact with the side of the positive electrode collector 7 facing the positive electrode column 2, so that when the positive electrode column 2 and the positive electrode collector 7 are welded through the boss 71 and the groove 21, the rivet rib 22 and the rivet block 6 are both subjected to the instantaneous impact force of the riveting, and this force will squeeze the lower insulating member 5.

[0052] As for the specific material, the upper insulating member 3 and the lower insulating member 5 can be made of insulating materials with a certain elasticity, such as rubber, sponge or foam.

[0053] In this embodiment, a first deformation release groove 51 is provided on one side of the lower insulating member 5 facing the housing 1, and the first deformation release groove 51 is at least partially located below the sealing member 4. By providing the first deformation release groove 51 on the lower insulating member 5, when the sealing member 4 is subjected to the abutment force of the riveting block 6, the sealing member 4 itself is squeezed and deformed toward the first deformation release groove 51, thereby releasing the deformation of the sealing member 4, which, on the one hand, avoids the sealing member 4 from failing due to cracking under pressure, and on the other hand, the extension deformation of the sealing member 4 also increases the sealing area of the sealing member 4, thereby improving the sealing performance.

[0054] In terms of the setting shape, the lower insulating part 5 is a circular gasket, and a circular hole for the positive electrode column 2 to pass through is provided in the middle of the circular gasket. The first deformation release groove 51 can be an annular groove 21 arranged along the circumference of the seal 4 or the circular hole, so that when the seal 4 is squeezed, its circumference can be deformed toward the annular groove 21, thereby increasing the amount of deformation release space and reducing the risk of fracturing of the seal 4 as much as possible.

[0055] In this embodiment, a second deformation relief groove 52 is further provided on the surface of the lower insulating part 5 facing the housing 1, and the second deformation relief groove 52 is arranged corresponding to the second riveting part 62. When the second riveting part 62 is stressed and squeezes the lower insulating part 5, the second deformation relief groove 52 can cause the lower insulating part 5 to be deformed under force along the second deformation relief groove 52, so as to release the extrusion deformation amount of the lower insulating part 5, avoid the situation that the lower insulating part 5 cracks and fails due to excessive compression, and play a protective role for the lower insulating part 5.

[0056] In this embodiment, the second deformation relief groove 52 communicates with the first deformation relief groove 51, and the second deformation relief groove 52 is arranged along the length direction of the lower insulating part 5, so that the extrusion deformation of the second riveting part 62 on the lower insulating part 5 in the length direction can be effectively released, and the risk of the lower insulating part 5 being fractured is reduced as much as possible.

[0057] The second deformation relief groove 52 is specifically a rectangular groove 21, and the length of the rectangular groove 21 extends to the outer end of the second riveting part 62, so that the extrusion deformation of the second riveting part 62 on the lower insulating part 5 can be effectively released.

[0058] It should be noted here that the inner end of the first riveting part 61 is the end that abuts against the outer wall surface of the positive electrode post 2, the outer end of the first riveting part 61 is the end far from the positive electrode post 2, the inner end of the second riveting part 62 is the end close to the positive electrode post 2, this end abuts against the end of the riveting rib 22, and the outer end of the second riveting part 62 is the end far from the positive electrode post 2.

[0059] Furthermore, a support rib 53 is provided on the surface of the lower insulating part 5 away from the housing 1, and the support rib 53 abuts against the positive electrode current collector plate 7 to play a role in supporting and positioning the installation of the positive electrode current collector plate 7.

[0060] In this embodiment, the support rib 53 is an annular rib arranged along the circumference of the lower insulating part 5, which can support and position the circumferential direction of the positive electrode current collector plate 7. Specifically, the annular rib can be formed by stamping, extrusion or machining.

[0061] In this embodiment, the seal 4 includes a first sealing portion 41 and a second sealing portion 42. Among them, the first sealing portion 41 is abutted and arranged between the outer surface of the housing 1 and the bottom surface of the limiting protrusion 23, and the end of the first sealing portion 41 abuts against the upper insulating member 3. The second sealing portion 42 is abutted and arranged between the outer wall of the positive electrode post 2 and the inner wall of the mounting hole, and the bottom of the second sealing portion 42 abuts against the first riveting portion 61. With this arrangement, the first sealing portion 41 is abutted and arranged between the outer surface of the housing 1 and the bottom surface of the limiting protrusion 23, so as to seal between the outer surface of the housing 1 and the bottom surface of the limiting protrusion 23. The second sealing portion 42 is abutted and arranged between the outer wall of the positive electrode post 2 and the inner wall of the mounting hole, so as to seal between the outer wall of the positive electrode post 2 and the inner wall of the mounting hole. At the same time, the end of the first sealing portion 41 abuts against the upper insulating member 3, and the bottom of the second sealing portion 42 abuts against the first riveting portion 61, which can enhance the sealing performance.

[0062] Specifically, the seal 4 is a Z-shaped sealing ring. The top of the Z-shaped sealing ring is the first sealing portion 41, and the bottom of the Z-shaped sealing ring is the second sealing portion 42.

[0063] In terms of specific installation and cooperation, in this embodiment, one side of the limiting protrusion 23 facing the housing 1 is provided with a first sealing surface 231 and a second sealing surface 232 arranged in a stepped manner up and down. The first sealing portion 41 is sealingly attached to the first sealing surface 231, and the second sealing portion 42 is sealingly attached to the second sealing surface 232. By providing a double surface (the first sealing surface 231 and the second sealing surface 232) up and down on one side of the limiting protrusion 23 facing the housing 1, and the double surface is respectively matched with the first sealing portion 41 and the second sealing portion 42, a stepped seal between the positive electrode post 2 and the housing 1 is realized, and the sealing performance is excellent.

[0064] In this embodiment, the upper insulating member 3 includes a first insulating portion 31 and a second insulating portion 32. Among them, the first insulating portion 31 covers the outer periphery of the limiting protrusion 23, and the second insulating portion 32 is arranged between the bottom surface of the limiting protrusion 23 and the outer surface of the housing 1, and the inner end of the second insulating portion 32 abuts against the first sealing portion 41. With this arrangement, the first insulating portion 31 covers the outer periphery of the limiting protrusion 23, which can protect the limiting protrusion 23 from being damaged by collision. The second insulating portion 32 is arranged between the bottom surface of the limiting protrusion 23 and the outer surface of the housing 1, so as to realize insulation between the limiting protrusion 23 and the housing 1.

[0065] Specifically, the upper insulating member 3 is a U-shaped member with an avoidance hole provided in the middle for the positive electrode post 2 to pass through. The vertical part of the U-shaped member is the first insulating portion 31, which wraps around the outer periphery of the limiting protrusion 23. The horizontal part of the U-shaped member is the second insulating portion 32, which is arranged between the bottom surface of the limiting protrusion 23 and the outer surface of the housing 1.

[0066] In addition, in this embodiment, a limiting groove is provided on the outer surface of the housing 1 along the circumferential direction of the mounting hole. Both the second insulating portion 32 and the first sealing portion 41 are disposed in the limiting groove to position and install the second insulating portion 32 and the first sealing portion 41 through the limiting groove, thereby improving the installation accuracy thereof on the housing 1.

[0067] The battery of this embodiment further includes a pole group 8. The pole group 8 is disposed in the housing 1, and the positive electrode tab of the pole group 8 is connected to the positive current collector plate 7. The pole group 8 is used to accommodate and release electric quantity, and the positive current collector plate 7 is connected to the positive electrode tab of the pole group 8 to realize the collection and extraction of the positive current of the pole group 8 through the positive current collector plate 7.

[0068] Specifically, the pole group 8 is a wound cylindrical battery cell, and its size is smaller than the inner cavity size of the housing 1 to facilitate its placement in the housing 1. The pole group 8 is provided with a positive electrode tab and a negative electrode tab to facilitate the extraction of positive current and negative current.

[0069] Meanwhile, a negative current collector plate 9 is further included. The negative current collector plate 9 is connected to both the negative electrode tab of the pole group 8 and the housing 1 to collect and introduce the negative current of the pole group 8 onto the housing 1. Specifically, the negative current collector plate 9 is welded to the negative electrode tab of the pole group 8 and is used to collect the negative current of the pole group 8 and then output the negative current. In this embodiment, since the negative current collector plate 9 is welded to the housing 1, the negative current collector plate 9 and the housing 1 are both negatively charged as a whole.

[0070] In addition to the above settings, to seal the housing 1, the battery further includes a negative electrode cover plate 10. The negative electrode cover plate 10 is sealingly connected to the open end of the housing 1 to seal the housing 1, thereby completing the assembly work of the battery.

[0071] In terms of the welding method, penetration welding technology can be used for the cooperation between the bottom surface of the groove 21 and the top surface of the boss 71, between the positive current collector plate 7 and the positive electrode tab of the pole group 8, between the negative current collector plate 9 and the negative electrode tab of the pole group 8, and between the negative electrode cover plate 10 and the housing 1.

[0072] It should be noted that the battery of this embodiment can be a cylindrical battery, a rectangular battery, etc., which is specifically selected according to needs and is not specifically limited in this embodiment.

[0073] For the convenience of understanding, the assembly process of the battery of this embodiment is introduced as follows:

[0074] The positive electrode column 2 is installed in the mounting hole of the housing 1.

[0075] Specifically, the positive electrode column 2 is inserted into the mounting hole of the shell 1, and the limiting protrusion 23 on the positive electrode column 2 is located outside the shell 1, and the rivet rib 22 on the positive electrode column 2 is located inside the shell 1, so that the two ends of the positive electrode column 2 are limited by the limiting protrusion 23 and the rivet rib 22 to prevent it from falling out of the mounting hole, thereby improving the matching reliability of the positive electrode column 2 and the shell 1.

[0076] The upper insulating member 3 is disposed between the limiting protrusion 23 and the outer surface of the shell 1 , the sealing member 4 is disposed between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, and the lower insulating member 5 is disposed on the inner surface of the shell 1 .

[0077] Specifically, the first insulating portion 31 of the upper insulating member 3 is covered on the outer periphery of the limiting protrusion 23, the second insulating portion 32 of the upper insulating member 3 is arranged between the bottom surface of the limiting protrusion 23 and the outer surface of the shell 1, the first sealing portion 41 of the sealing member 4 is abutted between the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23, and the end of the first sealing portion 41 is abutted against the second insulating portion 32, and the second sealing portion 42 of the sealing member 4 is abutted between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole. In this arrangement, the first insulating portion 31 is covered on the outer periphery of the limiting protrusion 23, which can protect the limiting protrusion 23 and prevent the limiting protrusion 23 from collision damage. The second insulating portion 32 realizes insulation between the limiting protrusion 23 and the shell 1. The first sealing portion 41 seals between the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23. The second sealing portion 42 seals between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole. At the same time, the end of the first sealing portion 41 abuts against the second insulating portion 32, which can enhance the sealing performance.

[0078] The riveting block 6 is arranged on the outer periphery of the riveting rib 22 , the first riveting portion 61 of the riveting block 6 penetrates the lower insulating member 5 and abuts against the sealing member 4 , and the lower insulating member 5 is arranged between the second riveting portion 62 of the riveting block 6 and the inner surface of the housing 1 .

[0079] Specifically, the rivet block 6 is arranged on the outer periphery of the rivet rib 22, which can enhance the structural strength of the positive electrode side of the battery cell and reduce the risk of the rivet rib 22 fracturing the lower insulating member 5 during riveting. The first rivet portion 61 of the rivet block 6 avoids the abutment between the lower insulating member 5 and the sealing member 4, thereby improving the space utilization of the battery in the height direction. The cooperation between the second rivet portion 62 of the rivet block 6 and the lower insulating member 5 ensures the insulation performance.

[0080] Further, the battery assembly method further includes: providing a groove 21 at one end of the positive electrode post 2 located inside the housing 1; providing a boss 71 on a surface of the positive current collector plate 7 facing the positive electrode post 2, the boss 71 being snap-fitted into the groove 21, and the top surface of the boss 71 being adapted to be welded in cooperation with the bottom surface of the groove 21. By snap-fitting the boss 71 of the positive current collector plate 7 into the groove 21 of the positive electrode post 2 and welding the mating portion of the top surface of the boss 71 and the bottom surface of the groove 21, the welding and fixing of the two are achieved. The mating of the top surface of the boss 71 and the bottom surface of the groove 21 increases the welding area, and the groove 21 reduces the welding thickness of the positive electrode post 2, thereby reducing the welding difficulty, improving the assembly efficiency, reducing the contact internal resistance, increasing the over-current capacity of the battery, and improving the product yield.

[0081] In summary, the battery of this embodiment has the following advantages: by welding and connecting the bottom surface of the groove 21 of the positive electrode post 2 and the top surface of the boss 71 of the current collector plate, the welding area is increased, the contact internal resistance is reduced, and the over-current capacity of the battery is increased; through the double-table sealing cooperation design of the first sealing surface 231 and the second sealing surface 232 on the positive electrode post 2 and the first sealing portion 41 and the second sealing portion 42, the sealing performance is improved; by directly contacting the first riveting portion 61 of the riveting block 6 with the seal 4, the lower insulating member 5 is avoided, and the space utilization rate of the battery in the height direction is improved. Also, by the second riveting portion 62 of the riveting block 6 abutting against the lower insulating member 5, the insulation performance is ensured, thereby providing a battery capable of improving the over-current capacity and space utilization rate of the battery.

[0082] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, Comprising: A housing provided with mounting holes; A positive terminal installed in the mounting hole, with a limiting protrusion provided at one end of the positive terminal outside the housing, and a riveting rib provided at one end of the positive terminal inside the housing. The limiting protrusion and the riveting rib respectively limit both ends of the positive terminal; An insulating and sealing assembly including an upper insulating member, a sealing member, and a lower insulating member. The upper insulating member is disposed between the limiting protrusion and the outer surface of the housing. The sealing member is abutted and disposed between the outer wall of the positive terminal and the inner wall of the mounting hole. The lower insulating member is disposed on the inner surface of the housing; A riveting block disposed on the outer periphery of the riveting rib. The riveting block includes a first riveting portion and a second riveting portion arranged in an up-and-down stepped manner. The first riveting portion penetrates through the lower insulating member and abuts against the sealing member. The second riveting portion abuts against the lower insulating member. Both the riveting rib and the riveting block are located inside the housing; A first deformation release groove is provided on the surface of the lower insulating member facing the housing. The first deformation release groove is at least partially located below the sealing member. A second deformation release groove is also provided on the surface of the lower insulating member facing the housing. The second deformation release groove is correspondingly arranged with the second riveting portion. The first deformation release groove is provided as an annular groove along the circumferential direction of the sealing member; The second deformation release groove is opened along the length direction of the lower insulating member, and the second deformation release groove communicates with the first deformation release groove; The sealing member includes: a first sealing portion abutted and disposed between the outer surface of the housing and the bottom surface of the limiting protrusion, and the end of the first sealing portion abuts against the upper insulating member; A second sealing portion abutted and disposed between the outer wall of the positive terminal and the inner wall of the mounting hole, and the bottom of the second sealing portion abuts against the first riveting portion. And the first deformation release groove is at least partially located below the second sealing portion; The upper insulating member includes a second insulating portion disposed between the bottom surface of the limiting protrusion and the outer surface of the housing, and the inner end of the second insulating portion abuts against the first sealing portion. A limiting groove is provided on the outer surface of the housing along the circumferential direction of the mounting hole. Both the second insulating portion and the first sealing portion are disposed in the limiting groove; A first sealing surface and a second sealing surface arranged in an up-and-down stepped manner are provided on the surface of the limiting protrusion facing the housing. The first sealing portion is hermetically attached to the first sealing surface, and the second sealing portion is hermetically attached to the second sealing surface; The battery further includes a positive current collector plate disposed inside the housing. A supporting rib is provided on the surface of the lower insulating member away from the housing. The supporting rib abuts against the positive current collector plate; A groove is provided at one end of the positive terminal inside the housing. A convex platform is provided on the surface of the positive current collector plate facing the positive terminal. The convex platform is a hollow circular platform. The convex platform is snap-fitted into the groove, and the top surface of the convex platform is adapted to be welded to the groove bottom surface in cooperation; 2. The battery according to claim 1, characterized in that, The upper insulating member includes: a first insulating portion covering the outer periphery of the limiting protrusion.

3. The battery according to claim 1 or 2, characterized in that, The circumferential direction of the groove forms the riveting rib.

4. The battery according to claim 3, characterized in that, The opening of the groove is provided with a chamfer, and the boss is clamped in the groove through the chamfer; And / or, the battery further includes: a pole group disposed in the housing, the positive electrode tab of the pole group is connected to the positive current collector plate; a negative current collector plate connected to both the negative electrode tab of the pole group and the housing.

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