Battery and battery pack

Abstract

The utility model discloses a battery and a battery pack. The battery comprises a shell, an electrode assembly, a collector plate and an end plate, the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the current collecting disc comprises a disc body and a boss, and the disc body is connected with the electrode assembly and provided with a second through hole communicated with the containing cavity; the boss is connected to the side, away from the electrode assembly, of the disc body and provided with a cavity with an opening in one end, and the cavity communicates with the containing cavity through the second through hole. The end plate is connected with the shell and covers the containing cavity, the end plate is provided with a first through hole, and the boss penetrates through the first through hole and is connected with the end plate; the side, away from the electrode assembly, of the boss is provided with a pressure relief nick. According to the battery disclosed by the invention, the boss on the current collecting disc is matched with the first through hole in the end plate, so that the current collecting disc and the end plate are mutually positioned and connected, and the cavity and the pressure relief nick are formed in the boss, so that an anti-explosion structure is transferred, thermal runaway gas is conveniently and directly discharged from the accommodating cavity, the occupation of axial space is reduced, and the service life of the battery is prolonged. And the volume energy density of the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery and a battery pack. Background Art

[0002] The current collecting plate and end plate of the cylindrical battery need to be electrically connected, and an explosion-proof valve is set on the end plate. This requires a vent hole to be set on the current collecting plate, and a gap needs to be set between the current collecting plate and the end plate to facilitate the circulation of thermal runaway gas in the battery. This structure is complex, occupies a large space inside the battery, and the battery volume energy density is low. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a battery, aiming to solve the problem of low volume energy density of the battery due to the complex structure of the existing collecting plate and end plate; another purpose of the embodiment of the present application is to provide a battery pack.

[0004] Technical solution: A battery according to an embodiment of the present application comprises:

[0005] A housing having a receiving cavity;

[0006] an electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity;

[0007] A current collecting plate, the current collecting plate comprising:

[0008] a disc body, the disc body being connected to the electrode assembly and having a second through hole communicating with the accommodating cavity;

[0009] a boss, the boss being connected to a side of the disk body away from the electrode assembly and covering the second through hole; the boss having a cavity with an open end, the cavity being connected to the accommodating cavity through the second through hole;

[0010] an end plate, the end plate being connected to the shell and covering the accommodating cavity, the end plate having a first through hole, the boss penetrating the first through hole and being connected to the end plate;

[0011] Wherein, the boss is provided with a pressure relief notch, and the pressure relief notch is located on a side of the boss away from the electrode assembly.

[0012] In some embodiments, the collecting plate includes a plate body having a second through hole, the boss is connected to the plate body and covers the second through hole, and the cavity is connected to the accommodating cavity through the second through hole.

[0013] In some embodiments, the boss has:

[0014] a first wall, wherein the pressure relief notch is disposed on a side of the first wall away from the electrode assembly;

[0015] A first stress relief groove is arranged on a side of the first wall away from the electrode assembly, the first stress relief groove is arranged around the pressure relief notch, and an opening of the first stress relief groove is away from the electrode assembly.

[0016] In some embodiments, the end plate has a second stress relief groove, the second stress relief groove is arranged around the through hole, and the opening of the second stress relief groove faces away from the electrode assembly.

[0017] In some embodiments, the boss further includes a second wall, the second wall is disposed around the first wall, the second wall is connected between the first wall and the disk body, and the second wall and the first wall enclose the cavity.

[0018] In some embodiments, a side of the second wall away from the first wall is inclined away from the second through hole; the first through hole has a hole wall, a side of the hole wall away from the first wall is inclined away from the second through hole, and the hole wall is connected to the second wall.

[0019] In some embodiments,

[0020] The end plate has a first surface facing the disk body, the first through hole has a hole wall, an end of the hole wall facing the first surface is provided with a first transition section, and the first transition section is connected between the hole wall and the first surface;

[0021] The boss includes a second transition section, and the second transition section is connected between the second wall and the disk body;

[0022] The hole wall is connected to the second wall, and the first transition section is connected to the second transition section.

[0023] In some embodiments, the disc body and the boss of the current collecting disc are integrally connected.

[0024] In some embodiments, the collecting disk is a split structure, and the boss also includes a connecting portion, which is arranged around the second wall and connected to the second wall, at least a portion of the second wall is passed through the second through hole, and the connecting portion is located between the disk body and the electrode assembly and connected to the disk body.

[0025] In some embodiments, the current collecting disk is a split structure, and the boss also includes a connecting portion, which is arranged around the second wall and connected to the second wall, and the connecting portion is located on a side of the disk body away from the electrode assembly and connected to the disk body.

[0026] In some embodiments, the collecting plate is a split structure, and the boss further includes a connecting portion, which is arranged around the second wall and connected to the second wall, and the connecting portion is located in the second through hole and connected to the plate body.

[0027] In some embodiments, the side of the first wall facing away from the electrode assembly is located in the first through hole, or the side of the first wall facing away from the electrode assembly is coplanar with the side of the end plate facing away from the electrode assembly.

[0028] Accordingly, a battery pack described in an embodiment of the present application includes a battery as described in any one of the aforementioned embodiments.

[0029] Beneficial effects: Compared with the prior art, a battery in an embodiment of the present application comprises a shell, an electrode assembly, a current collecting disk and an end plate; the shell has a accommodating cavity, and the electrode assembly is arranged in the accommodating cavity; the current collecting disk comprises a disk body and a boss, the disk body is connected to the electrode assembly and has a second through hole connected to the accommodating cavity; the boss is connected to the side of the disk body away from the electrode assembly, and covers the second through hole; the boss has a cavity with an opening at one end, and the cavity is connected to the accommodating cavity through the second through hole; the end plate is connected to the shell and covers the accommodating cavity, the end plate has a first through hole, the boss passes through the first through hole and is connected to the end plate; wherein, the boss is provided with a pressure relief notch, and the pressure relief notch is located on the side of the boss away from the electrode assembly. The battery of the present application cooperates with each other through the boss on the collecting disk and the first through hole on the end plate to achieve mutual positioning connection between the collecting disk and the end plate, and by arranging a cavity and a pressure relief notch on the boss, the explosion-proof structure is transferred to facilitate the direct discharge of thermal runaway gas from the accommodating cavity, without maintaining a gap between the collecting disk and the end plate, thereby simplifying the structure, reducing the occupation of the axial space, and being beneficial to improving the volume energy density of the battery.

[0030] Compared with the prior art, a battery pack according to an embodiment of the present application includes a battery as described in any one of the above embodiments. It is understandable that the battery pack has all the technical features and beneficial effects of the above batteries, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a schematic diagram of the overall structure of a battery in an embodiment of the present application;

[0033] Figure 2 is a cross-sectional view of a battery according to an embodiment of the present application;

[0034] Figure 3 is a three-dimensional diagram of a current collecting plate of a battery according to an embodiment of the present application;

[0035] Figure 4 yes Figure 3 A cross-sectional view of

[0036] Figure 5 is a three-dimensional diagram of an end plate of a battery according to an embodiment of the present application;

[0037] Figure 6 yes Figure 5 A cross-sectional view of

[0038] Figure 7 is a cross-sectional view of a battery in which the connection between the boss and the disk body is at an oblique angle according to an embodiment of the present application;

[0039] Figure 8 yes Figure 7 A cross-sectional view of a current collecting plate of an embodiment;

[0040] Fig. 9 yes Figure 7 A cross-sectional view of an end plate of an embodiment;

[0041] Fig.10 is a cross-sectional view of a battery in which the connection between the boss and the disk body is rounded according to an embodiment of the present application;

[0042] Fig.11 yes Fig.10 A cross-sectional view of a current collecting plate of an embodiment;

[0043] Fig.12 yes Fig.10 A cross-sectional view of an end plate of an embodiment;

[0044] Fig.13 is a cross-sectional view of a first connection method between a boss and a disc body in an embodiment of the present application;

[0045] Fig.14 is a cross-sectional view of a second connection method between the boss and the disc body in an embodiment of the present application;

[0046] Fig.15 is a cross-sectional view of a third connection method between the boss and the disc body in an embodiment of the present application;

[0047] Fig.16 is a top view of the first end plate structure of the embodiment of the present application;

[0048] Fig.17 is a top view of a second end plate structure according to an embodiment of the present application;

[0049] Fig.18 is a top view of a third end plate structure of an embodiment of the present application;

[0050] Fig.19 is a top view of a fourth end plate structure of an embodiment of the present application;

[0051] Fig. 20 is a top view of a fifth end plate structure of an embodiment of the present application;

[0052] Figure numerals: 1. shell; 11. accommodating cavity; 2. electrode assembly; 3. collecting plate; 31. boss; 311. cavity; 312. first wall; 313. first pressure relief groove; 314. second wall; 315. connecting portion; 316. pressure relief notch; 317. second transition section; 32. plate body; 321. second through hole; 4. end plate; 41. first through hole; 411. hole wall; 412. first transition section; 42. second pressure relief groove; 43. first surface; 5. weld. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0054] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0055] The applicant noted that the electrode assembly in the inner cavity of the cylindrical battery needs to be electrically connected to the shell. The main method currently used is: the collector plate adopts a hook design, and after welding with the pole ear, the hook is electrically connected to the shell side wall by laser welding. In this method, the gap between the hook and the shell wall is difficult to control, and welding in the inner cavity of the shell is difficult to remove dust and control foreign matter; in addition, in the above structure, it is necessary to open a hole in the collector plate, and then set up explosion-proof valves and end plates and other structures. The overall structure is complex, occupies the internal axial space of the battery, and is not conducive to the improvement of the battery volume energy density.

[0056] In view of this, an embodiment of the present application provides a battery, aiming to solve at least one of the above problems.

[0057] like Figure 1-Figure 20 As shown, an embodiment of the present application provides a battery, including a shell 1, an electrode assembly 2, a current collecting disk 3 and an end plate 4; the shell 1 has a accommodating cavity 11, the electrode assembly 2 is arranged in the accommodating cavity 11, and the current collecting disk 3 is connected to the electrode assembly 2; the current collecting disk 3 includes a boss 31, the boss 31 extends in a direction away from the electrode assembly 2, the boss 31 has a cavity 311, and the cavity 311 is connected to the accommodating cavity 11; the end plate 4 is connected to the shell 1 and covers the accommodating cavity 11, the end plate 4 has a first through hole 41, the boss 31 passes through the first through hole 41 and is connected to the end plate 4; wherein, the boss 31 is provided with a pressure relief notch 316, and the pressure relief notch 316 is located on the side of the boss 31 away from the electrode assembly 2.

[0058] Specifically, in the embodiment of the present application, by providing a boss 31 on the current collecting plate 3, providing a first through hole 41 on the end plate 4, the boss 31 is penetrated in the first through hole 41, and the mutual limitation of the boss 31 and the first through hole 41 is realized. In some embodiments, the electrical connection between the current collecting plate 3 and the end plate 4 can be realized by splicing welding between the boss 31 and the hole wall 411 of the first through hole 41. Preferably, the inner diameter of the first through hole 41 is equal to the outer diameter of the boss 31, so that the precise positioning between the first through hole 41 and the boss 31 is realized, and the mutual positioning connection between the current collecting plate 3 and the end plate 4 can be realized by welding the boss 31 to the end plate 4. At this time, by using the boss 31 and the first through hole 41, the welding of the end plate 4 and the current collecting plate 3 is transferred from the inside of the shell 1 to the outside of the shell 1, so that the welding operation space becomes larger, the welding difficulty is effectively reduced, and the foreign particles generated by the welding are all on the outside of the battery, which is convenient for dust removal after welding, and effectively prevents foreign matter from falling into the accommodating cavity 11.

[0059] In addition, the position of the boss 31 inserted into the first through hole 41 can be controlled, so that the axial distance between the collecting plate 3 and the end plate 4 can be controlled, thereby achieving controllable axial assembly tolerance between the collecting plate 3 and the end plate 4 .

[0060] Furthermore, in the embodiment of the present application, a cavity 311 with an opening at one end is provided in the boss 31, and the cavity 311 is connected to the accommodating cavity 11. A pressure relief notch 316 is provided on the side of the boss 31 facing away from the electrode assembly 2. This structure transfers the explosion-proof structure from the end plate 4 directly to the collecting disk 3 and directly contacts the outside world, so that the thermal runaway gas is directly discharged from the accommodating cavity 11 without maintaining a gap between the collecting disk 3 and the end plate 4, thereby simplifying the structure, reducing the occupied axial space, and facilitating improving the volume energy density of the battery.

[0061] It should be noted that the embodiment of the present application is preferentially applied to the negative electrode of the cylindrical battery, and the connection between the tab and the end plate 4 and the housing 1 is realized through the current collecting plate 3. At the same time, the embodiment of the present application sets the explosion-proof notch on the current collecting plate 3, so that the thickness of the end plate 4 can be flexibly set, and the end plate 4 only needs to open the first through hole 41 at the position opposite to the explosion-proof notch to expose the explosion-proof notch smoothly. In this way, the explosion-proof pressure relief of the negative terminal of the cylindrical battery can be realized.

[0062] In some embodiments, the collecting plate 3 includes a plate body 32 having a second through hole 321 , the boss 31 is connected to the plate body 32 and covers the second through hole 321 , and the cavity 311 is connected to the accommodating cavity 11 through the second through hole 321 .

[0063] In this embodiment, the boss 31 and the disk body 32 can be connected in one piece or in a split type. The second through hole 321 is provided so that the cavity 311 of the boss 31 can be connected to the accommodating cavity 11 through the second through hole 321, so that when thermal runaway occurs, the gas in the accommodating cavity 11 can directly enter the accommodating cavity 11 through the second through hole 321 and break through the explosion-proof notch to achieve pressure relief. The present application realizes that the boss 31 is hollow and connected to the accommodating cavity 11 through the second through hole 321 and the cavity 311, so that the boss 31 can reduce the wall thickness on the basis of ensuring a certain height to be connected with the end plate 4 in a limited manner, so as to facilitate the setting of the explosion-proof notch and subsequent pressure relief.

[0064] In some embodiments, the boss 31 is provided with a first wall 312 and a first pressure relief groove 313, and the pressure relief notch 316 is arranged on the side of the first wall 312 away from the electrode assembly 2; the first pressure relief groove 313 is arranged on the side of the first wall 312 away from the electrode assembly 2, the first pressure relief groove 313 is arranged around the pressure relief notch 316, and the opening of the first pressure relief groove 313 is away from the electrode assembly 2.

[0065] In the embodiment of the present application, the first wall 312 is used to enclose the cavity 311, the first wall 312 is located in the first through hole 41 or passes through the first through hole 41, and the pressure relief notch 316 is arranged on the side of the first wall 312 away from the electrode assembly 2, that is, the pressure relief notch 316 is arranged on the side of the first wall 312 away from the cavity 311. Therefore, if thermal runaway occurs in the cylindrical battery, the thermal runaway gas fills the cavity 311 and impacts the first wall 312. At this time, the pressure relief notch 316 is relatively weak relative to other areas of the first wall 312. Therefore, when a large amount of thermal runaway gas accumulates inside the cylindrical battery, the explosion-proof notch is broken through first to achieve rapid discharge of the thermal runaway gas and avoid battery explosion.

[0066] In addition, a first stress relief groove 313 is provided so that a partial structure of the first wall 312 exists between the first stress relief groove 313 and the hole wall 411 of the first through hole 41. At this time, the weld 5 generated by welding the boss 31 and the hole wall 411 of the first through hole 41 of the end plate 4 will cause local deformation of the structures on both sides of the weld 5. The first stress relief groove 313 is provided to provide deformation space for the local deformation of the boss 31 caused by welding, and to absorb the stress caused by the local deformation, thereby ensuring that the remaining structure of the boss 31 on the side of the first stress relief groove 313 away from the weld 5 will not be affected by the welding deformation.

[0067] In some embodiments, the end plate 4 has a second stress relief groove 42 , the second stress relief groove 42 is arranged around the through hole, and the opening of the second stress relief groove 42 faces away from the electrode assembly 2 .

[0068] In this embodiment, the second stress relief groove 42 is arranged around the first through hole 41, which is equivalent to isolating the weld 5 and the remaining structure of the end plate 4 on the side of the second stress relief groove 42 away from the weld 5 from the weld 5, and the second stress relief groove 42 is used to buffer and absorb the local deformation stress generated by the welding of the end plate 4, and provide deformation space for the local deformation at the weld 5.

[0069] In some embodiments, the boss 31 further includes a second wall 314 , which is disposed around the first wall 312 , connected between the first wall 312 and the disk body 32 , and the second wall 314 and the first wall 312 enclose the cavity 311 .

[0070] In this embodiment, the second wall 314 is disposed on the side of the disk body 32 away from the electrode assembly 2, and the first wall 312 is supported and away from the disk body 32 by the second wall 314, thereby forming a corresponding cavity 311. In this embodiment, the second wall 314 is penetrated in the first through hole 41, and is used to connect with the end plate 4, so as to increase the contact area with the end plate 4 and facilitate subsequent connection and welding. And by providing the second wall 314, the axial spacing between the end plate 4 and the current collecting plate 3 can be flexibly adjusted according to the axial space of the accommodating cavity 11, so that the axial distance between the end plate 4 and the current collecting plate 3 can be adjusted.

[0071] It should be noted that the current collecting plate 3 and the end plate 4 structure of the embodiment of the present application can be applied to the negative electrode of the battery. In this case, in order to ensure the flatness of the negative electrode, it is preferred to set the side of the first wall 312 away from the electrode assembly 2 to be flush with the side of the end plate 4 away from the electrode assembly 2. Of course, the first wall 312 can be located at a corresponding position in the first through hole 41 according to actual needs.

[0072] In addition, it should be noted that after the boss 31 of the embodiment of the present application is inserted into the first through hole 41, laser welding can be used to complete the electrical connection and sealing between the collecting plate 3 and the end plate 4.

[0073] Please join us Figure 7-Figure 12 In some embodiments, the first through hole 41 has a hole wall 411, and one end of the hole wall 411 away from the first wall 312 is inclined in a direction away from the second through hole 321, and the side of the second wall 314 away from the first wall 312 is inclined in a direction away from the second through hole 321, and the hole wall 411 is connected to the second wall 314.

[0074] In this embodiment, the second wall 314 and the hole wall 411 are both inclined, so that the outer diameter of the boss 31 gradually decreases in the direction away from the disk body 32, and the inner diameter of the first through hole 41 gradually decreases in the direction away from the disk body 32, which is more conducive to the boss 31 being assembled into the first through hole 41. At the same time, the second wall 314 and the hole wall 411 have the same inclination angle, so that the second wall 314 and the hole wall 411 can be fitted after the assembly is complete, which is convenient for the end plate 4 and the current collecting plate 3 to be sealed after welding.

[0075] Please join us Figure 10-12In some embodiments, the end plate 4 has a first surface 43 facing the disk body 32, the first through hole 41 has a hole wall 411, and the end of the hole wall 411 facing the first surface 43 is provided with a first transition section 412, and the first transition section 412 is connected between the hole wall 411 and the first surface 43; the boss 31 includes a second transition section 317, and the second transition section 317 is connected between the second wall 314 and the disk body 32; the hole wall 411 is connected to the second wall 314, and the first transition section 412 is connected to the second transition section 317.

[0076] In the embodiment of the present application, the first transition section 412 has an outwardly convex arc surface and is arranged at the junction of the hole wall 411 and the first surface 43, so as to realize a smooth connection and transition between the hole wall 411 and the first surface 43; the second transition section 317 has an inwardly concave arc surface and is arranged at the junction of the second wall 314 and the disk body 32, so as to realize a smooth connection and transition between the second wall 314 and the disk body 32, and the outwardly convex first transition section 412 cooperates with the inwardly concave second transition section 317, which makes it easier to assemble and also easier to connect and fit the end plate 4 with the collecting plate 3.

[0077] like Figure 2-Figure 4 , Figure 7-Figure 8 , Figure 10-11 As shown; in some embodiments, the collecting plate 3 is an integrated structure.

[0078] In these embodiments, the collecting plate 3 is an integrated structure, which can make the overall structure of the collecting plate 3 more stable and can reduce the space occupied by the collecting plate 3 inside the accommodating cavity 11 to a certain extent.

[0079] In addition, the collecting plate 3 may be a split structure, that is, the plate body 32 and the boss 31 are independent structures, and the two are connected by welding, which is more convenient for actual production and effectively reduces the difficulty of production.

[0080] like Fig.13 As shown, in some embodiments, the collecting disk 3 is a split structure, and the boss 31 also includes a connecting portion 315, which is arranged around the second wall 314 and connected to the second wall 314, at least part of the second wall 314 is passed through the second through hole 321, and the connecting portion 315 is located between the disk body 32 and the electrode assembly 2 and is connected to the disk body 32.

[0081] In this embodiment, the second wall 314 is penetrated in the second through hole 321, and the mutual limitation between the second wall 314 and the second through hole 321 is utilized to ensure the accuracy of the positioning connection of the boss 31, and the connection area between the boss 31 and the disk body 32 is large, and the contact area between the disk body 32 and the end plate 4 is also large.

[0082] like Fig.14 As shown, in some embodiments, the collecting plate 3 is a split structure, and the boss 31 also includes a connecting portion 315, which is arranged around the second wall 314 and connected to the second wall 314, and the connecting portion 315 is located on the side of the plate body 32 away from the electrode assembly 2 and is connected to the plate body 32.

[0083] In this embodiment, when the current collecting disc 3 and the end plate 4 are assembled, the connecting portion 315 is located between the disc body 32 and the end plate 4, and the end plate 4 is welded to the boss 31 for electrical connection and sealing of the battery. This structure can create a certain gap between the end plate 4 and the current collecting disc 3. If the end plate 4 is partially deformed, the gap can buffer and absorb energy, thereby avoiding corresponding deformation of the current collecting disc 3 and ensuring the safety of the battery.

[0084] like Fig.15 As shown, in some embodiments, the collecting plate 3 is a split structure, and the boss 31 also includes a connecting portion 315, which is arranged around the second wall 314 and connected to the second wall 314, and the connecting portion 315 is located in the second through hole 321 and connected to the plate body 32.

[0085] In this embodiment, the connection portion 315 is located in the second through hole 321 and its side away from the cavity 311 is directly connected to the hole wall of the second through hole 321, which can reduce the occupation of the connection portion 315 in the axial space of the battery. The boss 31 can be inserted into the first through hole 41 and connected to the end plate 4 according to the needs, and the axial distance between the disc body 32 and the end plate 4 can be adjusted by the position of the boss 31 in the first through hole 41.

[0086] In some embodiments, the side of the first wall 312 facing away from the electrode assembly 2 is located in the first through hole 41 , or the side of the first wall 312 facing away from the electrode assembly 2 is coplanar with the side of the end plate 4 facing away from the electrode assembly 2 .

[0087] In this embodiment, the first wall 312 is located in the first through hole 41 and does not extend beyond the side of the end plate 4 facing away from the electrode assembly 2, so that the axial welding position of the end plate 4 and the boss 31 can be adjusted, and the axial distance between the end plate 4 and the collecting plate 3 can be adjusted, and the flatness of the entire surface of the end plate 4 is ensured.

[0088] It should also be noted that if Figure 16-Figure 20 As shown, the boss 31 of the embodiment of the present application can be cylindrical, elliptical, semi-cylindrical, a cylindrical straight-sided shape or a chamfered rectangular parallelepiped, and the corresponding first through hole 41 is set to a shape matching the boss 31 to facilitate the assembly and sealing connection between the boss 31 and the end plate 4.

[0089] Accordingly, a battery pack described in an embodiment of the present application includes a battery as described in any one of the aforementioned embodiments.

[0090] It is understandable that the battery pack has all the technical features and beneficial effects of the aforementioned batteries, which will not be described in detail here.

[0091] It should be noted that the battery pack of the embodiment of the present application can be used for backup power supplies, electrodes, electric vehicles, electric bicycles, electric motorcycles, large batteries, etc.

[0092] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0093] The above is a detailed introduction to a battery and a battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A housing (1), wherein the housing (1) has a receiving chamber (11); An electrode assembly (2), the electrode assembly (2) being arranged in the accommodating cavity (11); A current collecting plate (3), the current collecting plate (3) comprising: a disk body (32), the disk body (32) being connected to the electrode assembly (2) and having a second through hole (321) communicating with the accommodating cavity (11); a boss (31), the boss (31) being connected to a side of the disk (32) away from the electrode assembly (2) and covering the second through hole (321); the boss (31) having a cavity (311) with an opening at one end, the cavity (311) being in communication with the accommodating cavity (11) through the second through hole (321); an end plate (4), the end plate (4) being connected to the shell (1) and covering the accommodating cavity (11), the end plate (4) having a first through hole (41), the boss (31) passing through the first through hole (41) and being connected to the end plate (4); The boss (31) is provided with a pressure relief notch (316), and the pressure relief notch (316) is located on a side of the boss (31) facing away from the electrode assembly (2).

2. The battery according to claim 1, characterized in that The boss (31) is provided with: A first wall (312), wherein the pressure relief notch (316) is arranged on a side of the first wall (312) facing away from the electrode assembly (2); A first pressure relief groove (313), wherein the first pressure relief groove (313) is arranged on a side of the first wall (312) away from the electrode assembly (2), the first pressure relief groove (313) is arranged around the pressure relief notch (316), and an opening of the first pressure relief groove (313) is away from the electrode assembly (2).

3. The battery according to claim 1 or 2, characterized in that: The end plate (4) has a second stress relief groove (42), the second stress relief groove (42) is arranged around the through hole (41), and the opening of the second stress relief groove (42) faces away from the electrode assembly (2).

4. The battery according to claim 2, characterized in that The boss (31) further includes a second wall (314), the second wall (314) being arranged around the first wall (312), the second wall (314) being connected between the first wall (312) and the disk body (32), and the second wall (314) and the first wall (312) enclosing the cavity (311).

5. The battery according to claim 4, characterized in that A side of the second wall (314) away from the first wall (312) is inclined in a direction away from the second through hole (321); the first through hole (41) has a hole wall (411), an end of the hole wall (411) away from the first wall (312) is inclined in a direction away from the second through hole (321), and the hole wall (411) is connected to the second wall (314).

6. The battery according to claim 4, characterized in that The end plate (4) has a first surface (43) facing the disk body (32); the first through hole (41) has a hole wall (411); an end of the hole wall (411) facing the first surface (43) is provided with a first transition section (412); the first transition section (412) is connected between the hole wall (411) and the first surface (43); The boss (31) comprises a second transition section (317), and the second transition section (317) is connected between the second wall (314) and the disk body (32); The hole wall (411) is connected to the second wall (314), and the first transition section (412) is connected to the second transition section (317).

7. The battery according to claim 6, characterized in that The disc body (32) and the boss (31) of the current collecting disc (3) are connected in one piece.

8. The battery according to claim 4, characterized in that The current collecting disk (3) is of a split structure, and the boss (31) further comprises a connecting portion (315), the connecting portion (315) is arranged around the second wall (314) and is connected to the second wall (314), at least a portion of the second wall (314) is passed through the second through hole (321), and the connecting portion (315) is located between the disk body (32) and the electrode assembly (2) and is connected to the disk body (32).

9. The battery according to claim 4, characterized in that The current collecting disk (3) is of a split structure, and the boss (31) further comprises a connecting portion (315), the connecting portion (315) is arranged around the second wall (314) and is connected to the second wall (314), and the connecting portion (315) is located on a side of the disk body (32) away from the electrode assembly (2) and is connected to the disk body (32).

10. The battery according to claim 4, characterized in that The collecting plate (3) is of a split structure, and the boss (31) further comprises a connecting portion (315), wherein the connecting portion (315) is arranged around the second wall (314) and is connected to the second wall (314), and the connecting portion (315) is located in the second through hole (321) and is connected to the plate body (32).

11. The battery according to claim 2, characterized in that The side of the first wall (312) facing away from the electrode assembly (2) is located in the first through hole (41), or the side of the first wall (312) facing away from the electrode assembly (2) is coplanar with the side of the end plate (4) facing away from the electrode assembly (2).

12. A battery pack, characterized in that: Comprising a battery as claimed in any one of claims 1 to 11.

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