Battery

Abstract

This utility model discloses a battery, including a cylindrical shell, an end plate, a positive electrode assembly, a negative electrode assembly, and a winding core. The end plate is connected to and seals one end of the cylindrical shell, and the end plate has a through hole. The positive electrode assembly includes a terminal post, a pressure ring, a first sealing ring, a second sealing ring, a first insulating ring, and a second insulating ring. The pressure ring is at least partially located inside the cylindrical shell. The first part of the terminal post is located on the side of the end plate away from the cylindrical shell. The second part of the terminal post passes through the through hole and the pressure ring and is connected to the pressure ring. The first sealing ring surrounds the outer periphery of the second part, and the first insulating ring surrounds the outer periphery of the first sealing ring. Both the first sealing ring and the first insulating ring are clamped between the second part and the end plate. The second sealing ring surrounds the outer periphery of the second part, and the second insulating ring surrounds the outer periphery of the second sealing ring. Both the second sealing ring and the second insulating ring are clamped between the pressure ring and the end plate, thereby achieving a good sealing effect between the terminal post and the end plate.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery. Background Technology

[0002] The positive electrode of a cylindrical battery typically includes an end plate and a terminal post. The end plate has a through hole, through which the terminal post passes, so that one end of the terminal post is located in the external space, and the other end of the terminal post can extend into the internal space of the cylindrical battery to connect to the positive electrode of the cylindrical battery core.

[0003] To prevent electrolyte leakage from the gap between the terminal and the through hole in cylindrical batteries, a sealing sleeve is usually installed between the terminal and the through hole in related technologies. However, the compression of the sealing sleeve in this solution is small, resulting in poor sealing effect between the terminal and the through hole. Furthermore, the sealing sleeve is easily damaged by external impacts or friction during use, leading to a rapid decline in the sealing performance and a short service life. Utility Model Content

[0004] The purpose of this invention is to provide a battery that can achieve a better sealing effect between the terminal post and the end plate, and can maintain a better sealing effect for a longer period of time.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery is provided, comprising:

[0007] Cylindrical shell;

[0008] An end plate is connected to and seals one end of the cylindrical shell, and the end plate is provided with a through hole;

[0009] A positive electrode assembly includes a terminal post, a pressure ring, a first sealing ring, a second sealing ring, a first insulating ring, and a second insulating ring. The pressure ring is at least partially located inside the cylindrical housing. The terminal post includes a first portion and a second portion. The first portion is located on the side of the end plate opposite to the cylindrical housing. The second portion passes through the through hole and the pressure ring and is connected to the pressure ring. The first sealing ring surrounds the outer periphery of the second portion. The first insulating ring surrounds the outer periphery of the first sealing ring, and both the first sealing ring and the first insulating ring are clamped between the second portion and the end plate. The second sealing ring surrounds the outer periphery of the second portion. The second insulating ring surrounds the outer periphery of the second sealing ring, and both the second sealing ring and the second insulating ring are clamped between the pressure ring and the end plate.

[0010] A negative electrode assembly, the negative electrode assembly being connected to and sealed at the end of the cylindrical housing away from the end plate; and...

[0011] A core is disposed within the cylindrical housing, with the positive electrode of the core connected to the second part and the negative electrode of the core connected to the negative electrode assembly.

[0012] As a preferred technical solution of the battery, the first part has a first abutting surface, the pressure ring has a second abutting surface, the first sealing ring has a first end face and a second end face opposite to each other along the extension direction of the cylindrical shell, the second sealing ring has a third end face and a fourth end face opposite to each other along the extension direction of the cylindrical shell, the first abutting surface abuts against the first end face, the second abutting surface abuts against the fourth end face, and the second end face abuts against the third end face;

[0013] When the pole post and the pressure ring are assembled, the distance between the first abutment surface and the second abutment surface along the extension direction of the cylindrical shell is h1. When the first sealing ring is not assembled, the distance between the first end face and the second end face is h2. When the second sealing ring is not assembled, the distance between the third end face and the fourth end face is h3. 55%(h2+h3)≤h1≤75%(h2+h3).

[0014] As a preferred technical solution of the battery, the first part has a first abutting surface and a third abutting surface facing the end plate. The third abutting surface surrounds the outer periphery of the first abutting surface and is located on the side of the first abutting surface away from the end plate. The first abutting surface abuts against the end of the first sealing ring away from the second sealing ring, and the third abutting surface abuts against the first insulating ring.

[0015] As a preferred embodiment of the battery, the first insulating ring extends along the extension direction of the cylindrical shell from one end away from the end plate to surround the outer periphery of the first portion, and / or, the first insulating ring has a fourth abutment surface and a fifth abutment surface, the fourth abutment surface surrounds the outer periphery of the fifth abutment surface, and the fourth abutment surface is located on the side of the fifth abutment surface away from the end plate, the fourth abutment surface abuts against the third abutment surface, and the fifth abutment surface is located on the side of the first abutment surface facing the first sealing ring.

[0016] As a preferred technical solution of the battery, the first part has a second abutting surface and a sixth abutting surface facing the end plate. The sixth abutting surface surrounds the outer periphery of the second abutting surface and is located on the side of the second abutting surface away from the end plate. The second abutting surface abuts against the end of the second sealing ring away from the first sealing ring, and the sixth abutting surface abuts against the second insulating ring.

[0017] As a preferred embodiment of the battery, the second insulating ring extends along the extension direction of the cylindrical housing from one end away from the end plate to surround the outer periphery of the pressure ring, and / or, the second insulating ring has a seventh abutment surface and an eighth abutment surface, the seventh abutment surface surrounds the outer periphery of the eighth abutment surface, and the seventh abutment surface is located on the side of the eighth abutment surface away from the end plate, the seventh abutment surface abuts against the sixth abutment surface, and the eighth abutment surface is located on the side of the second abutment surface facing the second sealing ring.

[0018] As a preferred embodiment of the battery, in the unassembled state of the first sealing ring, the outer diameter of the first sealing ring is smaller than the inner diameter of the first insulating ring; and / or,

[0019] When the second sealing ring is not assembled, the outer diameter of the second sealing ring is smaller than the inner diameter of the second insulating ring.

[0020] As a preferred technical solution for the battery, the positive electrode assembly further includes a positive electrode current collector, which is welded to the side of the positive electrode sheet facing the end plate, and the side of the positive electrode current collector away from the winding core is connected to the first part.

[0021] As a preferred technical solution for the battery, the battery further includes a third insulating ring, which surrounds the outer periphery of the pressure ring and is located between the positive electrode current collector and the end plate;

[0022] The third insulating ring has a groove on at least one side along the extension direction of the cylindrical shell, and / or the outer diameter of the third insulating ring gradually decreases from the side away from the end plate to the side closer to the end plate.

[0023] As a preferred technical solution for the battery, the cylindrical shell and the end plate are integrated into one structure.

[0024] As a preferred embodiment of the battery, the cylindrical housing has an annular mounting groove communicating with the interior of the cylindrical housing at one end away from the end plate. The negative electrode assembly includes a negative electrode current collector, a conductive cover plate, and a negative electrode sealing sleeve. The negative electrode current collector is welded to the tab of the negative electrode sheet. The side of the negative electrode current collector away from the winding core is connected to the conductive cover plate. The edge region of the conductive cover plate is located within the annular mounting groove. The negative electrode sealing sleeve covers at least the outer peripheral surface of the conductive cover plate and two opposite sides of the edge region along the extension direction of the cylindrical housing. The negative electrode sealing sleeve is interference-fitted into the annular mounting groove.

[0025] As a preferred embodiment of the battery, the negative electrode current collector includes a support portion, multiple elastic connecting portions, and a tab connecting portion. The tab connecting portion is welded to the tab of the negative electrode sheet. The support portion is provided with a clearance groove. The multiple elastic connecting portions are arranged at intervals around the outer periphery of the tab connecting portion, and the elastic connecting portions are connected between the outer periphery of the tab connecting portion and the groove wall of the clearance groove. A portion of the elastic connecting portion is movably located within the clearance groove. A portion of the elastic connecting portion is bent to form a connecting end facing away from the winding core. The connecting end is press-fitted against the conductive cover plate; and / or,

[0026] The outer periphery of the negative electrode current collector is provided with multiple welded connection parts, which are arranged at intervals around the negative electrode current collector and are welded to the cylindrical shell.

[0027] As a preferred technical solution for the battery, the conductive cover plate is further provided with a thinning groove on the side surface facing the core, and the thinning groove extends around the center of the conductive cover plate.

[0028] The beneficial effects of this utility model are as follows:

[0029] By clamping the first sealing ring and the first insulating ring between the second part and the end plate using the terminal post and pressure ring of the positive electrode assembly of the battery, and clamping the second sealing ring and the second insulating ring between the pressure ring and the end plate, with the first insulating ring surrounding the outer periphery of the first sealing ring and the second insulating ring surrounding the outer periphery of the second sealing ring, the first insulating ring, together with the end plate and the second part, restricts the installation space of the first sealing ring from its outer periphery, and the second insulating ring, together with the end plate and the pressure ring, restricts the installation space of the second sealing ring from its outer periphery, thereby improving the installation space of the assembled first sealing ring and the second insulating ring. The compression of the second sealing ring improves the sealing effect between the first and second sealing rings and the terminal plate. On the other hand, the first insulating ring can protect the first sealing ring from its outer periphery, and the second insulating ring can protect the second sealing ring from its outer periphery. This reduces the possibility of damage to the first and second sealing rings caused by external forces, effectively improving the stability of the sealing performance of the first and second sealing rings and extending their service life, so that the battery terminal plate and the terminal plate can maintain a better sealing effect for a longer period of time. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a cross-sectional view of the battery structure described in the embodiment.

[0032] Figure 2 This is an exploded three-dimensional structural diagram of the battery described in the embodiment.

[0033] Figure 3 This is a partial cross-sectional view of the battery described in the embodiment.

[0034] Figure 4 This is a partial cross-sectional view of the battery described in the embodiment (the positive electrode assembly is in an unassembled state, and the winding core, third insulating ring, and positive electrode current collector are omitted).

[0035] Figure 5 This is an exploded view of the structure of the positive electrode assembly described in the embodiment (in an unassembled state, with the positive electrode current collector omitted).

[0036] Figure 6 for Figure 5 An exploded view of the structure shown.

[0037] Figure 7 for Figure 1 The diagram shown is a bottom view of the structure of the third insulating ring.

[0038] Figure 8 This is a partial cross-sectional view of the battery (without the winding core) described in the embodiment.

[0039] Figure 9 This is a three-dimensional structural diagram of the negative electrode current collector and the welded connection part described in the embodiment.

[0040] In the picture:

[0041] 1. Cylindrical shell; 10. Annular mounting groove;

[0042] 2. End plate; 20. Through hole;

[0043] 3. Positive electrode assembly; 30. Terminal post; 301. First part; 3011. First abutment surface; 3012. Third abutment surface; 302. Second part; 31. Pressure ring; 310. Second abutment surface; 311. Sixth abutment surface; 32. First sealing ring; 321. First end face; 322. Second end face; 323. First body part; 324. First extension part; 33. Second sealing ring; 330. Third end face; 331. Fourth end face; 34. First insulating ring; 340. Fourth abutment surface; 341. Fifth abutment surface; 35. Second insulating ring; 350. Seventh abutment surface; 351. Eighth abutment surface; 36. Positive electrode current collector;

[0044] 4. Negative electrode assembly; 40. Negative electrode current collector; 400. Support part; 4001. Clearance groove; 401. Flexible connection part; 402. Electrode tab connection part; 4021. Connection end; 403. Welded connection part; 41. Conductive cover plate; 410. Edge area; 411. Thinning groove; 42. Negative electrode sealing sleeve;

[0045] 5. Roll core;

[0046] 6. Third insulating ring; 60. Groove. Detailed Implementation

[0047] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] like Figures 1 to 3As shown, this utility model provides a battery, including a cylindrical shell 1, an end plate 2, a positive electrode assembly 3, a negative electrode assembly 4, and a core 5. The end plate 2 is connected to and seals one end of the cylindrical shell 1, and the end plate 2 is provided with a through hole 20. The positive electrode assembly 3 includes a terminal post 30, a pressure ring 31, a first sealing ring 32, a second sealing ring 33, a first insulating ring 34, and a second insulating ring 35. The pressure ring 31 is at least partially located inside the cylindrical shell 1. The terminal post 30 includes a first part 301 and a second part 302. The first part 301 is located on the side of the end plate 2 away from the cylindrical shell 1, and the second part 302 passes through the through hole 20 and the pressure ring 31 and is connected to the pressure ring 31. A sealing ring 32 surrounds the outer periphery of the second part 302, a first insulating ring 34 surrounds the outer periphery of the first sealing ring 32, and both the first sealing ring 32 and the first insulating ring 34 are clamped between the second part 302 and the end plate 2. A second sealing ring 33 surrounds the outer periphery of the second part 302, a second insulating ring 35 surrounds the outer periphery of the second sealing ring 33, and both the second sealing ring 33 and the second insulating ring 35 are clamped between the pressure ring 31 and the end plate 2. The negative electrode assembly 4 is connected to and sealed at the end of the cylindrical shell 1 away from the end plate 2. The core 5 is disposed inside the cylindrical shell 1, and the positive electrode sheet of the core 5 is connected to the second part 302, and the negative electrode sheet of the core 5 is connected to the negative electrode assembly 4.

[0051] By clamping the first sealing ring 32 and the first insulating ring 34 between the second part 302 and the end plate 2 using the terminal post 30 and the pressure ring 31 included in the positive electrode assembly 3 of the battery, and clamping the second sealing ring 33 and the second insulating ring 35 between the pressure ring 31 and the end plate 2, with the first insulating ring 34 surrounding the outer periphery of the first sealing ring 32 and the second insulating ring 35 surrounding the outer periphery of the second sealing ring 33, the first insulating ring 34, together with the end plate 2 and the second part 302, restricts the installation space of the first sealing ring 32 from the outer periphery of the first sealing ring 32, and the second insulating ring 35, together with the end plate 2 and the pressure ring 31, restricts the installation space of the second sealing ring 33 from the outer periphery of the second sealing ring 33, thereby improving the installation space of the first sealing ring 32 after assembly. The compression of the first sealing ring 32 and the second sealing ring 33 improves the sealing effect between the first sealing ring 32 and the second sealing ring 33 and the terminal plate 2. On the other hand, the first insulating ring 34 can be used to protect the first sealing ring 32 from the outer periphery, and the second insulating ring 35 can be used to protect the second sealing ring 33 from the outer periphery. This reduces the possibility of damage to the first sealing ring 32 and the second sealing ring 33 caused by external forces, effectively improving the stability of the sealing performance of the first sealing ring 32 and the second sealing ring 33, and extending the service life of the first sealing ring 32 and the second sealing ring 33, so that the battery terminal 30 and the terminal plate 2 can maintain a better sealing effect for a longer time.

[0052] Furthermore, the first insulating ring 34 can be used to keep the first part 301 insulated from the end plate 2, and the second insulating ring 35 can be used to keep the pressure ring 31 insulated from the end plate 2, so as to avoid short circuit due to electrical conduction between the pole post 30 and the pressure ring 31 and the end plate 2.

[0053] Optionally, in the unassembled state, the outer diameter of the first sealing ring 32 is smaller than the inner diameter of the first insulating ring 34. This allows the outer periphery of the first sealing ring 32 to form a gap with the inner surface of the first insulating ring 34 in the unassembled state. This provides a certain deformation filling space for the first sealing ring 32 when it is compressed in the assembled state. On the one hand, this avoids excessive compression of the first sealing ring 32, and on the other hand, it allows the first sealing ring 32 to actively fill the gap, thereby improving the sealing performance of the connection between the first sealing ring 32 and the first insulating ring 34.

[0054] Optionally, in the unassembled state, the outer diameter of the second sealing ring 33 is smaller than the inner diameter of the second insulating ring 35. This allows the outer periphery of the second sealing ring 33 to form a gap with the inner surface of the second insulating ring 35 in the unassembled state. This provides a certain deformation filling space for the second sealing ring 33 when it is compressed in the assembled state. On the one hand, this avoids excessive compression of the second sealing ring 33, and on the other hand, it allows the second sealing ring 33 to actively fill the gap, thereby improving the sealing performance of the connection between the second sealing ring 33 and the second insulating ring 35.

[0055] Preferably, when the first sealing ring 32 is not assembled, its outer diameter is smaller than the inner diameter of the first insulating ring 34, and when the second sealing ring 33 is not assembled, its outer diameter is smaller than the inner diameter of the second insulating ring 35. This results in better sealing performance between the first sealing ring 32 and the first insulating ring 34, as well as between the second sealing ring 33 and the second insulating ring 35.

[0056] Please combine Figures 4 to 6As shown, the first part 301 has a first abutting surface 3011, the pressure ring 31 has a second abutting surface 310, the first sealing ring 32 has a first end face 321 and a second end face 322 opposite to each other along the extension direction of the cylindrical shell 1, and the second sealing ring 33 has a third end face 330 and a fourth end face 331 opposite to each other along the extension direction of the cylindrical shell 1. The first abutting surface 3011 abuts against the first end face 321, the second abutting surface 310 abuts against the fourth end face 331, and the second end face 3011 abuts against the first end face 321. 22 abuts against the third end face 330. When the pole post 30 and pressure ring 31 are assembled, the distance between the first abutting surface 3011 and the second abutting surface 310 along the extending direction of the cylindrical shell 1 is h1. When the first sealing ring 32 is not assembled, the distance between the first end face 321 and the second end face 322 is h2. When the second sealing ring 33 is not assembled, the distance between the third end face 330 and the fourth end face 331 is h3. It can be understood that the distance between the first sealing ring 32 and the second sealing ring 330 is h3. When the sealing ring 33 is in the assembled state, the first sealing ring 32 and the second sealing ring 33 are restricted by the first abutting surface 3011 and the second abutting surface 310, such that the distance between the first end face 321 of the first sealing ring 32 and the fourth end face 331 of the second sealing ring 33 along the extension direction of the cylindrical shell 1 is equal to h1. That is, when the first sealing ring 32 and the second sealing ring 33 are in the assembled state, the compression of the first sealing ring 32 and the second sealing ring 33 as a whole along the extension direction of the cylindrical shell 1 is (h2+h3)-h1. In order to make the first sealing ring 32 and the second sealing ring 33 work together to achieve a better sealing effect between the pole post 30 and the end plate 2, the greater the compression of the first sealing ring 32 and the second sealing ring 33, the better. However, the greater the compression of the first sealing ring 32 and the second sealing ring 33, the more likely the first sealing ring 32 and the second sealing ring 33 will be over-compressed and damaged. Therefore, the compression of the first sealing ring 32 and the second sealing ring 33 should not be too large.

[0057] Based on this, alternatively, the distances h1, h2, and h3 can satisfy: 55%(h2+h3)≤h1≤75%(h2+h3). For example, the distance h1 can be 55%(h2+h3), 56%(h2+h3), 58%(h2+h3), 60%(h2+h3), 62%(h2+h3), 65%(h2+h3), 66%(h2+h3), 68%(h2+h3), 70%(h2+h3), 72%(h2+h3), or 75%(h2+h3), etc.

[0058] Optionally, at least one of the first sealing ring 32 and the second sealing ring 33 is partially interference-fitted between the outer periphery of the second portion 302 and the wall of the through hole 20, so as to further improve the sealing effect between the pole post 30 and the end plate 2 using the first sealing ring 32 and the second sealing ring 33.

[0059] In one optional example, the first sealing ring 32 includes a first body portion 323 and a first extension portion 324. The first body portion 323 is partially clamped between the second portion 302 and the end plate 2. The first extension portion 324 is connected to the first body portion 323 and is interference-fitted between the outer periphery of the second portion 302 and the wall of the through hole 20. One end of the first extension portion 324 away from the first body portion 323 abuts against the second sealing ring 33. At this time, the end face of the first body portion 323 away from the first extension portion 324 is the first end face 321, and the end face of the first extension portion 324 away from the first body portion 323 is the second end face 322.

[0060] In another alternative example, the second sealing ring 33 includes a second body portion and a second extension portion. The second body portion is clamped between the pressure ring 31 and the end plate 2. The second extension portion is connected to the second body portion and is interference-fitted between the outer periphery of the second portion 302 and the wall of the through hole 20. One end of the second extension portion away from the second body portion abuts against the first sealing ring 32. In this case, the end face of the second body portion away from the first extension portion 324 is the fourth end face 331, and the end face of the first extension portion 324 away from the second body portion is the third end face 330. The specific structure of the second sealing ring 33 including the second body portion and the second extension portion is not illustrated. Specifically, the structure of the second body portion can be referred to the structure of the first body portion 323, and the structure of the second extension portion can be referred to the structure of the first extension portion 324.

[0061] In another alternative example, the first sealing ring 32 includes the aforementioned first body portion 323 and first extension portion 324, and the second sealing ring 33 includes the aforementioned second body portion and second extension portion.

[0062] Optionally, the first portion 301 has a first abutting surface 3011 facing the end plate 2 and a third abutting surface 3012. The third abutting surface 3012 surrounds the outer periphery of the first abutting surface 3011 and is located on the side of the first abutting surface 3011 away from the end plate 2. The first abutting surface 3011 abuts against the end of the first sealing ring 32 away from the second sealing ring 33 (i.e., the first end face 321 as described in the aforementioned technical solution). The third abutting surface 3012 abuts against the first insulating ring 34, so that the first insulating ring 34 can be partially located between the first abutting surface 3011 and the third abutting surface 3012. That is, the first insulating ring 34 can be partially located on the side of the first sealing ring 32 away from the second sealing ring 33. This makes the protection of the first sealing ring 32 by the first insulating ring 34 more complete, and on the other hand, makes the thickness of the first insulating ring 34 along the extension direction of the cylindrical shell 1 thicker, so as to make the structural strength of the first insulating ring 34 better.

[0063] Optionally, the end of the first insulating ring 34 opposite to the end plate 2 extends along the extension direction of the cylindrical shell 1 to surround the outer periphery of the first part 301, so that the first insulating ring 34 can also be connected with the first part 301, which helps to make the relative position of the first insulating ring 34 and the pole post 30 more stable.

[0064] Optionally, the first insulating ring 34 has a fourth abutment surface 340 and a fifth abutment surface 341. The fourth abutment surface 340 surrounds the outer periphery of the fifth abutment surface 341, and the fourth abutment surface 340 is located on the side of the fifth abutment surface 341 away from the end plate 2. The fourth abutment surface 340 abuts against the third abutment surface 3012. The fifth abutment surface 341 is located on the side of the first abutment surface 3011 facing the first sealing ring 32. Thus, when the first sealing ring 32 is subjected to compressive force, it can deform to fill the fifth abutment surface 341 and the first abutment surface 3012. The gap formed between the first sealing ring 32 and the first insulating ring 34 and the first part 301 is used to seal the connection between the first sealing ring 32 and the first insulating ring 34 and the first part 301. The connection surface between the first sealing ring 32 and the first insulating ring 34 and the first part 301 is formed as a surface with more bends to increase the difficulty of fluid flow along the connection surface between the first sealing ring 32 and the first insulating ring 34 and the first part 301, thereby further improving the sealing performance of the first sealing ring 32 between the first insulating ring 34 and the first part 301.

[0065] When, as described in the aforementioned technical solution, the end of the first insulating ring 34 facing away from the end plate 2 extends along the extension direction of the cylindrical shell 1 to surround the outer periphery of the first part 301, it can be understood that the end of the first insulating ring 34 facing away from the end plate 2 protrudes from the fourth abutment surface 340.

[0066] Optionally, the first part 301 has a second abutment surface 310 facing the end plate 2 and a sixth abutment surface 311. The sixth abutment surface 311 surrounds the outer periphery of the second abutment surface 310 and is located on the side of the second abutment surface 310 away from the end plate 2. The second abutment surface 310 abuts against the end of the second sealing ring 33 away from the first sealing ring 32 (i.e., the fourth end face 331 as described in the aforementioned technical solution). The sixth abutment surface 311 abuts against the second insulating ring 35, so that the second insulating ring 35 can be partially located between the second abutment surface 310 and the sixth abutment surface 311. That is, the second insulating ring 35 can be partially located on the side of the second sealing ring 33 away from the first sealing ring 32. This makes the protection of the second sealing ring 33 by the second insulating ring 35 more complete, and on the other hand, makes the thickness of the second insulating ring 35 along the extension direction of the cylindrical shell 1 thicker, so as to make the structural strength of the second insulating ring 35 better.

[0067] Optionally, the end of the second insulating ring 35 opposite to the end plate 2 extends along the extension direction of the cylindrical shell 1 to surround the outer periphery of the pressure ring 31, so that the second insulating ring 35 can also be connected with the pressure ring 31, which helps to make the relative position of the second insulating ring 35 and the pressure ring 31 more stable.

[0068] Optionally, the second insulating ring 35 has a seventh abutment surface 350 and an eighth abutment surface 351. The seventh abutment surface 350 surrounds the outer periphery of the eighth abutment surface 351 and is located on the side of the eighth abutment surface 351 away from the end plate 2. The seventh abutment surface 350 abuts against the sixth abutment surface 311. The eighth abutment surface 351 is located on the side of the second abutment surface 310 facing the first sealing ring 32. Thus, when the second sealing ring 33 is subjected to compressive force, it can deform to fill the eighth abutment surface 351. The gap formed between the first sealing ring 32 and the second contact surface 310 and the sixth contact surface 311 is used to make the second sealing ring 33 sealably connected with the second insulating ring 35 and the pressure ring 31. The connection surface between the second sealing ring 33 and the second insulating ring 35 and the pressure ring 31 is formed as a surface with more bends to increase the difficulty of fluid flow along the connection surface between the second sealing ring 33 and the second insulating ring 35 and the pressure ring 31, thereby further improving the sealing performance of the first sealing ring 32 between the second insulating ring 35 and the pressure ring 31.

[0069] When the second insulating ring 35 extends along the extension direction of the cylindrical shell 1 to surround the outer periphery of the pressure ring 31 at the end opposite to the end plate 2, as described in the aforementioned technical solution, it can be understood that the end of the second insulating ring 35 opposite to the end plate 2 protrudes from the seventh abutment surface 350.

[0070] Optionally, the positive electrode assembly 3 also includes a positive electrode current collector 36. The positive electrode current collector 36 can be welded to the side of the positive electrode sheet facing the end plate 2 by welding methods including but not limited to laser welding and ultrasonic welding. The side of the positive electrode current collector 36 away from the core 5 is connected to the first part 301, so that the core 5 is electrically connected to the first part 301 through the positive electrode current collector 36. By welding the side of the positive electrode sheet facing the end plate 2 to the positive electrode current collector 36, the current-passing area between the positive electrode current collector 36 and the positive electrode sheet can be larger, thereby reducing the internal resistance at the connection between the positive electrode current collector 36 and the positive electrode sheet.

[0071] Please see also Figure 2 , Figure 3 and Figure 7 Optionally, the battery also includes a third insulating ring 6, which surrounds the outer periphery of the pressure ring 31 and is located between the positive current collector 36 and the end plate 2. The third insulating ring 6 can separate and insulate the positive current collector 36 from the end plate 2 to avoid the positive current collector 36 directly contacting the end plate 2 and causing the end plate 2 to be connected to the positive electrode sheet of the core 5.

[0072] Optionally, the third insulating ring 6 has a groove 60 on at least one side along the extension direction of the cylindrical shell 1, which can reduce the weight of the third insulating ring 6 and the amount of material used in the third insulating ring 6, and improve the flexibility of the third insulating ring 6 so that the third insulating ring 6 can deform with the winding core 5 during the charging and discharging process of the battery, so as to always maintain a good effect of spacing and insulating the positive current collector 36 from the end plate 2.

[0073] Preferably, there can be multiple grooves 60, which are arranged at intervals around the central axis of the third insulating ring 6. Alternatively, the groove 60 can be an annular groove around the central axis of the third insulating ring 6. This results in a larger opening area for the groove 60, which is beneficial for reducing the weight and material of the third insulating ring 6 and improving its flexibility.

[0074] Optionally, the outer diameter of the third insulating ring 6 gradually decreases from the side away from the end plate 2 to the side closer to the end plate 2, thereby making the transition between the outer peripheral surface of the third insulating ring 6 and the side of the third insulating ring 6 facing the end plate 2 smoother. This reduces the possibility of the connection between the outer peripheral surface of the third insulating ring 6 and the side of the third insulating ring 6 facing the end plate 2 colliding and causing mutual damage to the end plate 2. In this case, for example, the outer peripheral surface of the third insulating ring 6 can be formed as a slope or an outwardly convex arc surface.

[0075] Optionally, the third insulating ring 6 may be made of materials including but not limited to PP (polypropylene) and PET (polyethylene glycol terephthalate) to make the third insulating ring 6 have good insulation properties and be easy to shape.

[0076] Optionally, the cylindrical shell 1 and the end plate 2 are integral structures. Specifically, the cylindrical shell 1 and the end plate 2 can be stamped from a single sheet metal, or the cylindrical shell 1 and the end plate 2 can be connected by welding to form an integral structure, thereby achieving better sealing at the connection between the cylindrical shell 1 and the end plate 2.

[0077] Optionally, the cylindrical shell 1 and the end plate 2 can be made of steel or nickel-plated steel, so that the cylindrical shell 1 and the end plate 2 have good corrosion resistance and electrical conductivity.

[0078] Please see also Figure 1 , Figure 2 , Figure 8 and Figure 9Optionally, the end of the cylindrical shell 1 away from the end plate 2 is provided with an annular mounting groove 10 communicating with the interior of the cylindrical shell 1. The negative electrode assembly 4 includes a negative electrode current collector 40, a conductive cover plate 41, and a negative electrode sealing sleeve 42. The negative electrode current collector 40 is welded to the tab of the negative electrode sheet. The side of the negative electrode current collector 40 away from the core 5 is connected to the conductive cover plate 41. The edge region 410 of the conductive cover plate 41 is located in the annular mounting groove 10. The negative electrode sealing sleeve 42 covers at least the outer peripheral surface of the conductive cover plate 41 and the two opposite sides of the edge region 410 along the extension direction of the cylindrical shell 1. The negative electrode sealing sleeve 42 is interference-fitted to the annular mounting groove 10, thereby enabling the conductive cover plate 41 to block the end of the cylindrical shell 1 away from the end plate 2, and the sealing performance at the connection between the conductive cover plate 41 and the end plate 2 is good.

[0079] Optionally, the outer periphery of the negative electrode current collector 40 is provided with a plurality of welded connection parts 403. The plurality of welded connection parts 403 are arranged at intervals around the negative electrode current collector 40. The welded connection parts 403 are welded to the cylindrical shell 1 so that the relative posture of the negative electrode current collector 40 and the cylindrical shell 1 can be easily kept stable. At the same time, the negative electrode sheet of the core 5 can be electrically connected to the cylindrical shell 1 through the negative electrode current collector 40 and the welded connection parts 403, so that the cylindrical shell 1 and the end plate 2 are also formed as part of the negative electrode.

[0080] Optionally, the welded connection 403 may be elastic so that the relative position of the negative current collector 40 and the cylindrical shell 1 can change with the deformation of the core 5 during the charging and discharging process of the battery, so as to facilitate the good connection between the negative current collector 40 and the core 5 and avoid excessive compression between the negative current collector 40 and the core 5.

[0081] Optionally, the negative electrode current collector 40 includes a support portion 400, a plurality of elastic connecting portions 401, and a tab connecting portion 402. The tab connecting portion 402 is welded to the tab of the negative electrode sheet. The support portion 400 is provided with a relief groove 4001. The plurality of elastic connecting portions 401 are arranged at intervals around the outer periphery of the tab connecting portion 402, and the elastic connecting portion 401 is connected between the outer periphery of the tab connecting portion 402 and the groove wall of the relief groove 4001. The elastic connecting portion 401 is partially movable within the relief groove 4001. The elastic connecting portion 401 is partially bent to form a connecting end 4021 facing away from the core 5. The connecting end 4021 is press-fitted against the conductive cover plate 41, so that the core 5 can be supported by the support portion 400, so that the posture of the core 5 in the cylindrical housing 1 is more stable. By providing the elastic connecting portion 401, the elastic connecting portion 401 and the conductive cover plate 41 can easily maintain a stable electrical connection relationship during the charging and discharging process of the battery. Furthermore, by providing a relief groove 4001 in the support portion 400, interference between the structure of the support portion 400 and the elastic connection portion 401 can be avoided when the elastic connection portion 401 undergoes elastic deformation.

[0082] When the negative electrode current collector 40 is provided with a welding connection part 403 on the outer periphery as described in the aforementioned technical solution, it is understood that the welding connection part 403 is located on the outer periphery of the support part 400.

[0083] Optionally, the conductive cover plate 41 is further provided with a thinning groove 411 on the side surface facing the core 5. The thinning groove 411 extends around the center of the conductive cover plate 41, so that the location of the thinning groove 411 forms a weak point in the structural strength of the conductive cover plate 41. When the pressure inside the battery exceeds the pressure threshold, the thinning groove 411 can rupture, so that the internal space of the battery is connected to the external space, thereby acting as an explosion-proof valve to prevent the battery from violently exploding or overheating and catching fire, and improving the safety of battery use.

[0084] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0085] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0087] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A battery, characterized by, include: Cylindrical shell (1); End plate (2), which is connected to and sealed at one end of the cylindrical shell (1), and the end plate (2) is provided with a through hole (20); The positive electrode assembly (3) includes a terminal post (30), a pressure ring (31), a first sealing ring (32), a second sealing ring (33), a first insulating ring (34), and a second insulating ring (35). The pressure ring (31) is at least partially located inside the cylindrical housing (1). The terminal post (30) includes a first part (301) and a second part (302). The first part (301) is located on the side of the end plate (2) facing away from the cylindrical housing (1). The second part (302) passes through the through hole (20) and the pressure ring (31) and is connected to the pressure ring (31). The first sealing ring (32) surrounds the outer periphery of the second part (302), the first insulating ring (34) surrounds the outer periphery of the first sealing ring (32), and the first sealing ring (32) and the first insulating ring (34) are both clamped between the second part (302) and the end plate (2). The second sealing ring (33) surrounds the outer periphery of the second part (302), the second insulating ring (35) surrounds the outer periphery of the second sealing ring (33), and the second sealing ring (33) and the second insulating ring (35) are both clamped between the pressure ring (31) and the end plate (2). A negative electrode assembly (4), said negative electrode assembly (4) being connected to and sealed at one end of the cylindrical housing (1) away from the end plate (2); and, The core (5) is disposed inside the cylindrical housing (1), and the positive electrode of the core (5) is connected to the second part (302), and the negative electrode of the core (5) is connected to the negative electrode assembly (4).

2. The battery of claim 1, wherein, The first part (301) has a first abutting surface (3011), the pressure ring (31) has a second abutting surface (310), the first sealing ring (32) has a first end face (321) and a second end face (322) opposite to each other along the extension direction of the cylindrical shell (1), the second sealing ring (33) has a third end face (330) and a fourth end face (331) opposite to each other along the extension direction of the cylindrical shell (1), the first abutting surface (3011) abuts against the first end face (321), the second abutting surface (310) abuts against the fourth end face (331), and the second end face (322) abuts against the third end face (330); When the pole post (30) is assembled with the pressure ring (31), the distance between the first abutment surface (3011) and the second abutment surface (310) along the extension direction of the cylindrical shell (1) is h1. When the first sealing ring (32) is not assembled, the distance between the first end face (321) and the second end face (322) is h2. When the second sealing ring (33) is not assembled, the distance between the third end face (330) and the fourth end face (331) is h3. 55% (h2+h3)≤h1≤75% (h2+h3).

3. The battery according to claim 1, characterized in that, The first part (301) has a first abutting surface (3011) and a third abutting surface (3012) facing the end plate (2), the third abutting surface (3012) surrounds the outer periphery of the first abutting surface (3011) and the third abutting surface (3012) is located on the side of the first abutting surface (3011) away from the end plate (2), the first abutting surface (3011) abuts against the end of the first sealing ring (32) away from the second sealing ring (33), and the third abutting surface (3012) abuts against the first insulating ring (34).

4. The battery according to claim 3, characterized in that, The first insulating ring (34) extends along the extension direction of the cylindrical housing (1) to surround the outer periphery of the first portion (301) at one end away from the end plate (2), and / or, the first insulating ring (34) has a fourth abutment surface (340) and a fifth abutment surface (341), the fourth abutment surface (340) surrounds the outer periphery of the fifth abutment surface (341), and the fourth abutment surface (340) is located on the side of the fifth abutment surface (341) away from the end plate (2), the fourth abutment surface (340) abuts against the third abutment surface (3012), and the fifth abutment surface (341) is located on the side of the first abutment surface (3011) facing the first sealing ring (32).

5. The battery according to claim 1, characterized in that, The first part (301) has a second abutment surface (310) facing the end plate (2) and a sixth abutment surface (311), the sixth abutment surface (311) surrounding the outer periphery of the second abutment surface (310) and the sixth abutment surface (311) located on the side of the second abutment surface (310) away from the end plate (2), the second abutment surface (310) abuts against the end of the second sealing ring (33) away from the first sealing ring (32), and the sixth abutment surface (311) abuts against the second insulating ring (35).

6. The battery according to claim 5, characterized in that, The second insulating ring (35) extends along the extension direction of the cylindrical housing (1) from one end away from the end plate (2) to surround the outer periphery of the pressure ring (31), and / or, the second insulating ring (35) has a seventh abutment surface (350) and an eighth abutment surface (351), the seventh abutment surface (350) surrounds the outer periphery of the eighth abutment surface (351), and the seventh abutment surface (350) is located on the side of the eighth abutment surface (351) away from the end plate (2), the seventh abutment surface (350) abuts against the sixth abutment surface (311), and the eighth abutment surface (351) is located on the side of the second abutment surface (310) facing the second sealing ring (33).

7. The battery according to any one of claims 1-6, characterized in that, When the first sealing ring (32) is not assembled, the outer diameter of the first sealing ring (32) is smaller than the inner diameter of the first insulating ring (34); and / or, When the second sealing ring (33) is not assembled, the outer diameter of the second sealing ring (33) is smaller than the inner diameter of the second insulating ring (35).

8. The battery according to any one of claims 1-6, characterized in that, The positive electrode assembly (3) further includes a positive electrode current collector (36), which is welded to the side of the positive electrode sheet facing the end plate (2), and the side of the positive electrode current collector (36) away from the core (5) is connected to the first part (301).

9. The battery according to claim 8, characterized in that, The battery also includes a third insulating ring (6), which surrounds the outer periphery of the pressure ring (31) and is located between the positive electrode current collector (36) and the end plate (2); The third insulating ring (6) has a groove (60) on at least one side along the extension direction of the cylindrical shell (1), and / or the outer diameter of the third insulating ring (6) gradually decreases from the side away from the end plate (2) to the side closer to the end plate (2).

10. The battery according to any one of claims 1-6, characterized in that, The cylindrical shell (1) and the end plate (2) are an integral structure.

11. The battery according to any one of claims 1-6, characterized in that, The cylindrical shell (1) has an annular mounting groove (10) communicating with the interior of the cylindrical shell (1) at one end away from the end plate (2). The negative electrode assembly (4) includes a negative electrode current collector (40), a conductive cover plate (41), and a negative electrode sealing sleeve (42). The negative electrode current collector (40) is welded to the tab of the negative electrode sheet. The side of the negative electrode current collector (40) away from the core (5) is connected to the conductive cover plate (41). The edge region (410) of the conductive cover plate (41) is located in the annular mounting groove (10). The negative electrode sealing sleeve (42) covers at least the outer peripheral surface of the conductive cover plate (41) and the two opposite sides of the edge region (410) along the extension direction of the cylindrical shell (1). The negative electrode sealing sleeve (42) is interference-fitted to the annular mounting groove (10).

12. The battery according to claim 11, characterized in that, The negative electrode current collector (40) includes a support portion (400), a plurality of elastic connecting portions (401), and an electrode tab connecting portion (402). The electrode tab connecting portion (402) is welded to the electrode tab of the negative electrode sheet. The support portion (400) is provided with a relief groove (4001). The plurality of elastic connecting portions (401) are arranged at intervals around the outer periphery of the electrode tab connecting portion (402), and the elastic connecting portion (401) is connected between the outer periphery of the electrode tab connecting portion (402) and the groove wall of the relief groove (4001). The elastic connecting portion (401) is partially movably located within the relief groove (4001). The elastic connecting portion (401) is partially bent to form a connecting end (4021) facing away from the winding core (5). The connecting end (4021) is press-fitted against the conductive cover plate (41); and / or, The negative electrode current collector (40) is provided with a plurality of welding connection parts (403) on its outer periphery. The plurality of welding connection parts (403) are arranged at intervals around the negative electrode current collector (40), and the welding connection parts (403) are welded to the cylindrical shell (1).

13. The battery according to claim 11, characterized in that, The conductive cover plate (41) is further provided with a thinning groove (411) on the side surface facing the core (5), and the thinning groove (411) extends around the center of the conductive cover plate (41).

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