End cover for battery, battery shell and battery

Abstract

The utility model belongs to the field of batteries, and discloses an end cover for a battery, a battery shell and the battery, and the end cover for the battery comprises a cover plate and a riveting piece, a first through hole is formed in the cover plate; the first end of the riveting piece extends out of the first through hole and is riveted with one side of the cover plate to form a turnup, the outer diameter of the turnup is larger than the inner diameter of the first through hole, the second end of the riveting piece is provided with a limiting part, the limiting part is located on the other side of the cover plate, and the outer diameter of the limiting part is larger than the inner diameter of the first through hole. The flanging is formed by riveting the riveting piece and the cover plate, when the cover plate is stressed to deform towards the direction close to the limiting part, the inner diameter of the first through hole is increased, the flanging is separated from the cover plate from the first through hole to realize pressure relief protection, airtightness is more reliable, and bursting pressure is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an end cover for a battery, a battery shell and a battery. Background Art

[0002] Cylindrical batteries offer high capacity, long cycle life, and a wide operating temperature range. Cylindrical batteries are widely used in solar lamps, power tools, and toy models. With their widespread use, their safety performance has also drawn attention.

[0003] There is a safety hazard of explosion during the use of cylindrical batteries, especially in the use of lithium batteries and zinc-manganese batteries. There are two reasons for battery explosion: 1. Improper use of the battery causes an external short circuit, the battery discharges with a large current, the temperature rises, the electrolyte decomposes and produces gas, causing the internal pressure of the battery to exceed the limit and cause the battery to explode; 2. The battery has an internal short circuit caused by factors such as the manufacturing process, the battery discharges with a large current, the temperature rises, the electrolyte decomposes and produces gas, causing the internal pressure of the battery to exceed the limit and cause the battery to explode.

[0004] To prevent battery explosions, batteries are typically equipped with explosion-proof valves. Existing valves are typically punched. When internal battery pressure increases, the valve bulges and deforms, rupturing the valve's weakest point, thereby releasing pressure. However, punched valves can develop microcracks at the indentations, creating a risk of leakage if the valve opening conditions are not met. Furthermore, the residual thickness of the indentations is difficult to control, affecting the stability of the burst pressure. Utility Model Content

[0005] The purpose of the present application is to provide an end cover for a battery, a battery housing and a battery, which are not only more reliable in airtightness but also have more stable bursting pressure.

[0006] The technical solutions provided in this application are as follows:

[0007] In one aspect, an end cap for a battery is provided, comprising:

[0008] a cover plate, wherein a first through hole is provided on the cover plate;

[0009] A riveted part, wherein the first end of the riveted part extends out of the first through hole and is riveted with one side of the cover plate to form a flange, the outer diameter of the flange is larger than the inner diameter of the first through hole, and the second end of the riveted part is provided with a limiting portion, the limiting portion is located on the other side of the cover plate and has an outer diameter larger than the inner diameter of the first through hole.

[0010] In some embodiments, a first sealing member is further included, wherein the first sealing member is sealingly disposed between the riveted member and the cover plate.

[0011] In some embodiments, the first sealing member includes a sealing ring and a protrusion provided on the sealing ring, the sealing ring is located between the limiting portion and the cover plate, and the protrusion extends into the first through hole and is located between the outer side wall of the riveted member and the inner side wall of the first through hole.

[0012] In some embodiments, a first boss protruding toward the flange is provided on a side of the cover plate close to the flange, and the first boss is provided around the first through hole;

[0013] A side of the cover plate close to the flange is further provided with a recessed groove concave toward the limiting portion, the first boss is arranged around the recessed groove, and the first through hole is arranged in the recessed groove.

[0014] In some embodiments, a sealing pin is further included. The riveted component is provided with a second through hole. The second through hole passes through the riveted component from the first end to the second end of the riveted component. The sealing pin is sealed in the second through hole.

[0015] In some embodiments, an end surface of the first end of the riveted component is provided with an annular groove arranged along the circumference of the riveted component, and the flange is arranged around the annular groove.

[0016] On the other hand, a battery casing is further provided, comprising an outer shell and the end cover for the battery according to any one of the above embodiments, wherein one end of the outer shell is open, and the end cover is sealed at the opening.

[0017] In some embodiments, the housing includes a housing body, a positive electrode post, a first plastic, a second plastic, and a second seal. The opening is provided at one end of the housing body, a mounting hole is provided at the other end of the housing body, the positive electrode post passes through the mounting hole, the first plastic is provided on the outer side of an end of the housing body away from the opening, and the positive electrode post is riveted to the first plastic.

[0018] The second sealing member is sealed between the positive electrode column and the shell body;

[0019] The second plastic is arranged in the shell body, one end of the second plastic extends into the mounting hole and is located between the positive electrode column and the shell body, and the other end of the second plastic is fixedly connected to the inner wall of the shell body.

[0020] On the other hand, a battery is also provided, comprising a battery core and a battery casing according to any one of the above embodiments, wherein the battery core is disposed in the battery casing, and the positive electrode post of the battery casing is electrically connected to the positive electrode of the battery core.

[0021] In some embodiments, the battery core includes a wound core, a positive current collecting disk, and a negative current collecting disk, wherein the positive current collecting disk is electrically connected to the positive electrode tab of the wound core, and the negative current collecting disk is electrically connected to the negative electrode tab of the wound core;

[0022] The positive electrode current collecting disc is provided with a first reinforcement portion protruding in a direction away from the winding core;

[0023] The negative electrode current collecting disc is provided with a second reinforcement portion that protrudes in a direction away from the winding core.

[0024] The technical effect of the present application is that one end of the riveted part is riveted to the cover plate to form a flange structure. When the internal pressure of the battery increases and causes the cover plate to be deformed by force, the flange is detached from the cover plate to form a pressure relief protection, thereby realizing the pressure relief function, improving the safety of the battery, and preventing the battery from exploding. In addition, the end cover of this embodiment achieves pressure relief through the riveted structure, and there are no microcracks caused by punching. Not only is the airtightness more reliable, but the bursting pressure is also more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Figure 1 This is a schematic structural diagram of an end cap for a battery provided in an embodiment of the present application;

[0027] Figure 2 This is an exploded schematic diagram of an end cap for a battery provided by one embodiment of the present application;

[0028] Figure 3 is a cross-sectional schematic diagram of a battery provided in an embodiment of the present application;

[0029] Figure 4 yes Figure 3 A partial schematic diagram of the middle bottom;

[0030] Figure 5 1 is a schematic structural diagram of a first sealing member for an end cap of a battery provided in an embodiment of the present application;

[0031] Figure 6 This is an exploded schematic diagram of an end cap for a battery provided by another embodiment of the present application;

[0032] Figure 7 yes Figure 6 A schematic structural diagram of the riveted part and the sealing pin shown in another perspective;

[0033] Figure 8 yes Figure 3 A partial schematic diagram of the top of the middle;

[0034] Figure 9Schematic diagram of the structure of a positive electrode current collecting plate of a battery provided in an embodiment of the present application;

[0035] Figure 10 Schematic diagram of the structure of a negative electrode current collecting plate of a battery provided in an embodiment of the present application.

[0036] Description of Figure Numbers:

[0037] 100, end cap;

[0038] 10. Cover plate; 11. First through hole; 12. First boss; 13. Sink;

[0039] 20. Riveted piece; 21. Flanged edge; 22. Positioning portion; 23. Second through hole; 231. Concave groove; 24. Annular groove;

[0040] 30. First sealing member; 31. Sealing ring; 32. Protrusion;

[0041] 40. Sealing nails;

[0042] 200, housing; 210, housing body; 220, positive electrode; 230, first plastic; 240, second plastic; 241, inner plastic; 242, outer plastic; 250, second sealing member;

[0043] 300, battery cell; 310, winding core; 320, positive electrode current collecting disc; 321, first reinforcement; 322, notch; 323, third through hole; 330, negative electrode current collecting disc; 331, second reinforcement; 3311, arc-shaped through hole; 332, fourth through hole. DETAILED DESCRIPTION

[0044] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0045] In order to more clearly illustrate the application embodiments or technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive efforts.

[0046] To simplify the drawings, only the parts relevant to this application are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0047] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0048] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0049] In the embodiments shown in the drawings, directional indications (such as up, down, left, right, front, and back, etc.) are not absolute but relative when describing the structure and movement of each component, and are not used to limit the direction of the product in actual use.

[0050] In addition, in the description of this application, ordinal numbers, such as "first", "second", etc., are only used to distinguish and describe related objects, and cannot be understood as indicating or implying the relative importance or order between related objects.

[0051] According to the specific embodiments provided in this application, Figure 1 and Figure 2 As shown, an end cover 100 for a battery includes a cover plate 10 and a riveted piece 20, wherein the cover plate 10 is provided with a first through hole 11; a first end of the riveted piece 20 extends out of the first through hole 11 and is riveted with one side of the cover plate 10 to form a flange 21, wherein the outer diameter of the flange 21 is greater than the inner diameter of the first through hole 11, and a limiting portion 22 is provided at the second end of the riveted piece 20, which is located on the other side of the cover plate 10 and has an outer diameter greater than the inner diameter of the first through hole 11; when the cover plate 10 is deformed in a direction close to the limiting portion 22 by force, the inner diameter of the first through hole 11 increases, and the flange 21 is separated from the cover plate 10 from the first through hole 11.

[0052] In this embodiment, the rivet 20 and the cover plate 10 are fixedly connected together by riveting. The material of the rivet 20 is aluminum, and the material of the cover plate 10 can be steel. One end of the rivet 20 is riveted with the cover plate 10 to form a flange 21. The flange 21 is located on one side of the cover plate 10, and the limiting portion 22 is located on the other side of the cover plate 10. The flange 21 and the limiting portion 22 are respectively connected to the cover plate 10 for limiting connection, so that the rivet 20 and the cover plate 10 are fixedly sealed and connected to form a whole, that is, forming the end cover 100. Figure 3 and Figure 4 As shown, the end cover 100 can be installed at one end of the battery casing. When the internal pressure of the battery increases, a pressure difference is formed inside and outside the battery, causing the cover plate 10 to deform and bulge outward. When the cover plate 10 deforms and bulges outward, the inner diameter of the first through hole 11 increases, causing the flange 21 originally riveted on one side of the cover plate 10 to detach from the first through hole 11, and the sealing connection between the riveted part 20 and the cover plate 10 fails. The gas can be discharged from the first through hole 11 of the cover plate 10, thereby forming a pressure relief protection.

[0053] The flange 21 is formed by riveting one end of the rivet 20 to the cover plate 10. The outer diameter of the flange 21 will not be much larger than the inner diameter of the first through hole 11, so that when the cover plate 10 is deformed by force, the flange 21 can be disengaged from the first through hole 11 to form a pressure relief protection. The outer diameter of the flange 21 can be designed according to the pressure that the end cover 100 needs to withstand. This embodiment does not specifically limit the outer diameter of the flange 21. For example, when the end cover 100 needs to withstand a large pressure before pressure relief, the outer diameter of the flange 21 can be increased so that the cover plate 10 is greatly deformed before the flange 21 is disengaged from the cover plate 10 and pressure relief protection is provided. When the end cover 100 is subjected to a small pressure and pressure relief is provided, the outer diameter of the flange 21 can be reduced so that the cover plate 10 is slightly deformed before the flange 21 is disengaged from the cover plate 10 and pressure relief protection is provided.

[0054] In this embodiment, one end of the riveted part 20 is riveted to the cover plate 10 to form a flange structure. When the internal pressure of the battery increases and causes the cover plate 10 to be deformed by force, the flange 21 detaches from the cover plate 10 to form a pressure relief protection, thereby realizing the pressure relief function. The end cover 100 of this embodiment does not have microcracks caused by punching, which is not only more reliable in airtightness, but also has a more stable bursting pressure.

[0055] In one embodiment, a sealing member can be directly provided on the side wall of the riveted member 20, and the sealing member can form a component with the riveted member 20. For example, a sealing ring is sleeved on the side wall of the riveted member 20. When the riveted member 20 is fixedly connected to the cover plate 10 by riveting, the sealing ring on the side wall of the riveted member 20 abuts against the inner wall of the first through hole 11 to achieve a sealing effect.

[0056] In another embodiment, Figure 4As shown, the end cover 100 further includes a first sealing member 30, which is sealed between the riveted member 20 and the cover plate 10. For example, the first sealing member 30 is provided between the limiting portion 22 and the cover plate 10 to achieve a sealed connection between the riveted member 20 and the cover plate 10; or the first sealing member 30 is provided between the flange 21 and the cover plate 10 to also achieve a sealed connection between the riveted member 20 and the cover plate 10. Optionally, as Figure 4 and Figure 5 As shown, the first sealing member 30 includes a sealing ring 31 and a protrusion 32 disposed on the sealing ring 31. The sealing ring 31 is located between the limiting portion 22 and the cover plate 10. The protrusion 32 extends into the first through-hole 11 and is located between the outer wall of the rivet member 20 and the inner wall of the first through-hole 11. The protrusion 32 provides a seal between the rivet member 20 and the first through-hole 11. When the rivet member 20 is riveted and secured to the cover plate 10, the sealing ring 31 between the limiting portion 22 and the cover plate 10 is compressed to achieve a seal. In other words, the sealing ring 31 provides a seal between the limiting portion 22 and the cover plate 10, achieving a double seal and improving the sealing effect. The first sealing member 30 can be made of fluororubber.

[0057] In some embodiments, as Figure 2 As shown, a first boss 12 is provided on a side of the cover plate 10 close to the flange 21 and protrudes toward the flange 21. The first boss 12 is provided around the first through hole 11. The first boss 12 is provided on the cover plate 10 to increase the strength and rigidity of the cover plate 10, thereby improving the load-bearing capacity of the cover plate 10.

[0058] Further, such as Figure 2 As shown, the side of the cover plate 10 near the flange 21 is further provided with a recessed groove 13 that is concave toward the stopper 22. The first boss 12 is disposed around the recessed groove 13, and the first through-hole 11 is disposed within the recessed groove 13. When the end cap 100 is mounted on the battery housing, the side of the end cap 100 provided with the flange 21 is located inside the battery. In other words, the side of the cover plate 10 provided with the recessed groove 13 and the first boss 12 is located inside the battery. The recessed groove 13 on the cover plate 10 can be used to accommodate the second reinforcement portion 331 on the negative electrode current collecting plate 330 of the battery, thereby achieving a compact structure and reducing the size.

[0059] In some embodiments, as Figure 4 and Figure 6As shown, the end cap 100 further includes a sealing pin 40. A second through hole 23 is provided on the rivet 20. The second through hole 23 penetrates the rivet 20 from the first end to the second end of the rivet 20. The sealing pin 40 is sealed in the second through hole 23. The second through hole 23 can be used as a liquid injection hole. After the end cap 100 is installed on the battery shell, the electrolyte is injected into the battery through the second through hole 23 on the rivet 20. After the injection is completed, the second through hole 23 is welded and sealed with the sealing pin 40 to achieve airtightness inside the battery. Optionally, the sealing pin 40 can be a circular sheet structure, such as Figure 7 As shown, a recessed groove 231 may be provided at one end of the second through hole 23 close to the limiting portion 22 , and the sealing pin 40 and the recessed groove 231 may be welded together to form a seal.

[0060] In some embodiments, as Figure 2 and Figure 6 As shown, the end surface of the first end of the rivet 20 is provided with an annular groove 24 arranged along the circumference of the rivet 20, and the flange 21 is arranged around the annular groove 24. The annular groove 24 is formed between the flange 21 and the middle area of ​​the rivet 20, so that the flange 21 is separated from the middle area of ​​the rivet 20, so as to facilitate the formation of the flange 21.

[0061] The present application also provides an embodiment of a battery housing, such as Figures 1 to 8 As shown, it includes a housing 200 and an end cap 100 for a battery as described in any of the above embodiments. One end of the housing 200 is open, and the end cap 100 is sealed to the opening of the housing 200. During installation, the edge of the end cap 100 is flush with the outer diameter of the housing 200, and the end cap 100 and the housing 200 are sealed by laser welding in the form of side welding.

[0062] The housing 200 includes a housing body 210, a positive electrode post 220, a first plastic 230, a second plastic 240, and a second sealing member 250. An opening is provided at one end of the housing body 210, and a mounting hole is provided at the other end of the housing body 210. The positive electrode post 220 passes through the mounting hole. The first plastic 230 is provided on the outer side of the end of the housing body 210 away from the opening. The positive electrode post 220 and the first plastic 230 are riveted together. The second sealing member 250 is sealed between the positive electrode post 220 and the housing body 210. The second plastic 240 is provided within the housing body 210. One end of the second plastic 240 extends into the mounting hole and is located between the positive electrode post 220 and the housing body 210. The other end of the second plastic 240 is fixedly connected to the inner wall of the housing body 210.

[0063] Specifically, the shell body 210 is a single-pass structure, and the main material of the shell body 210 is steel. Figure 8As shown, a positive electrode post 220 and a first plastic 230 are mounted on the top surface of the outer shell 210. The first plastic 230 is used to isolate the positive electrode post 220 from the outer shell 210, thereby insulating the positive electrode post 220 from the outer shell 210. The first plastic 230 is fixed to the outside of the outer shell 210 and fixed to the top surface of the outer shell 210 by riveting. A second sealant 250 is disposed between the positive electrode post 220 and the outer shell 210, achieving a sealed connection between the positive electrode post 220 and the outer shell 210. A second plastic 240 is disposed within the outer shell 210 and serves to insulate the battery's positive electrode from the outer shell 210. The second plastic 240 can be divided into two components: an inner plastic 241 and an outer plastic 242. The inner plastic 241 and the outer plastic 242 are connected to each other and together serve to insulate the battery's positive electrode from the outer shell 210. The outer shell 210 has the same polarity as the battery's negative electrode, so insulation is not required between the outer shell 210 and the battery's negative electrode. An end cap 100 is mounted on the bottom of the outer shell 200. When the internal pressure of the battery increases, the end cap 100 acts as a pressure relief device, preventing the battery from exploding and improving battery safety.

[0064] The present application also provides an embodiment of a battery, such as Figures 1 to 10 As shown, it includes a battery core 300 and a battery shell as described in any of the above embodiments. The battery core 300 is arranged in the battery shell, and the positive electrode column 220 is electrically connected to the positive electrode of the battery core 300. The battery core 300 includes a winding core 310, a positive electrode current collecting disc 320 and a negative electrode current collecting disc 330. The winding core 310 is formed by winding the positive electrode sheet, the negative electrode sheet and the diaphragm. A positive electrode tab is provided at one end of the winding core 310 and a negative electrode tab is provided at the other end. The positive electrode current collecting disc 320 and the positive electrode tab of the winding core 310 are electrically connected by laser welding, and the negative electrode current collecting disc 330 and the negative electrode tab of the winding core 310 are electrically connected by laser welding. The positive electrode collecting disc 320 and the negative electrode collecting disc 330 are connected to the positive and negative tabs of the winding core 310 by laser welding to form a bare battery cell. After the bare battery cell is installed in the battery casing, the top surface of the positive electrode current collecting disc 320 is fitted with the bottom surface of the positive electrode column 220, and the positive electrode collecting disc 320 is connected to the positive electrode column 220 by laser penetration welding at the center hole on the upper end surface of the positive electrode column 220. The negative electrode current collecting disc 330 is fitted onto the side of the cover plate 10 provided with the flange 21 , and the cover plate 10 and the negative electrode current collecting disc 330 are connected by laser penetration welding.

[0065] The positive electrode current collecting disc 320 and the negative electrode current collecting disc 330 are both sheet-shaped structures. The positive electrode current collecting disc 320 is made of aluminum, and the negative electrode current collecting disc 330 is made of copper. Figure 9As shown, the positive current collecting disc 320 is provided with one or more first reinforcing portions 321 protruding in a direction away from the winding core 310. The first reinforcing portion 321 faces the positive electrode column 220. The first reinforcing portion 321 can increase the strength of the positive current collecting disc 320. The outer edge of the first reinforcing portion 321 is provided with a notch 322 for assembly positioning during installation. The other end of the first reinforcing portion 321 is provided with a third through hole 323, so that the positive current collecting disc 320 is easier to stamp and form.

[0066] like Figure 10 As shown, the negative electrode current collector disc 330 is provided with a second reinforcement portion 331, which protrudes away from the winding core 310. The second reinforcement portion 331 faces the cover plate 10 and increases the strength of the negative electrode current collector disc 330. Furthermore, the negative electrode current collector disc 330 is provided with a fourth through-hole 332, which communicates with the second through-hole 23 in the rivet 20 to facilitate electrolyte injection and avoid blocking the passage of electrolyte. The second reinforcement portion 331 is also provided with an arcuate through-hole 3311. This arcuate through-hole 3311 is provided to prevent gas leakage, allowing internal battery gas to escape through the arcuate through-hole 3311 and out of the negative electrode current collector disc 330.

[0067] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0068] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be considered as the scope of protection of the present application.

Claims

1. An end cap for a battery, characterized in that: include: a cover plate, wherein a first through hole is provided on the cover plate; A riveted part, wherein the first end of the riveted part extends out of the first through hole and is riveted with one side of the cover plate to form a flange, the outer diameter of the flange is larger than the inner diameter of the first through hole, and the second end of the riveted part is provided with a limiting portion, the limiting portion is located on the other side of the cover plate and has an outer diameter larger than the inner diameter of the first through hole.

2. The end cap for a battery according to claim 1, characterized in that: It also includes a first sealing member, which is sealed between the riveting member and the cover plate.

3. The end cap for a battery according to claim 2, characterized in that: The first sealing member includes a sealing ring and a protrusion arranged on the sealing ring. The sealing ring is located between the limiting portion and the cover plate. The protrusion extends into the first through hole and is located between the outer side wall of the riveted member and the inner side wall of the first through hole.

4. An end cap for a battery according to any one of claims 1 to 3, characterized in that: A first boss protruding toward the flange is provided on a side of the cover plate close to the flange, and the first boss is arranged around the first through hole; A side of the cover plate close to the flange is further provided with a recessed groove concave toward the limiting portion, the first boss is arranged around the recessed groove, and the first through hole is arranged in the recessed groove.

5. An end cap for a battery according to any one of claims 1 to 3, characterized in that: It also includes a sealing nail. The riveted piece is provided with a second through hole. The second through hole passes through the riveted piece from the first end to the second end of the riveted piece. The sealing nail is sealed in the second through hole.

6. An end cap for a battery according to any one of claims 1 to 3, characterized in that: An end surface of the first end of the riveted component is provided with an annular groove arranged along the circumference of the riveted component, and the flange is arranged around the annular groove.

7. A battery housing, characterized in that: The invention comprises a shell and the end cover for a battery according to any one of claims 1 to 6, wherein one end of the shell is open, and the end cover is sealed at the opening.

8. A battery casing according to claim 7, characterized in that: The housing includes a housing body, a positive electrode post, a first plastic, a second plastic, and a second sealing member. The opening is provided at one end of the housing body, and a mounting hole is provided at the other end of the housing body. The positive electrode post passes through the mounting hole. The first plastic is provided on the outer side of the end of the housing body away from the opening. The positive electrode post is riveted to the first plastic. The second sealing member is sealed between the positive electrode column and the shell body; The second plastic is arranged in the shell body, one end of the second plastic extends into the mounting hole and is located between the positive electrode column and the shell body, and the other end of the second plastic is fixedly connected to the inner wall of the shell body.

9. A battery, characterized in that: The invention comprises a battery core and a battery shell according to any one of claims 7 to 8, wherein the battery core is arranged in the battery shell, and the positive electrode column of the battery shell is electrically connected to the positive electrode of the battery core.

10. A battery according to claim 9, characterized in that: The battery core includes a winding core, a positive current collecting disk and a negative current collecting disk, wherein the positive current collecting disk is electrically connected to the positive electrode tab of the winding core, and the negative current collecting disk is electrically connected to the negative electrode tab of the winding core; The positive electrode current collecting disc is provided with a first reinforcement portion protruding in a direction away from the winding core; The negative electrode current collecting disc is provided with a second reinforcement portion that protrudes in a direction away from the winding core.

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