Battery, battery pack and vehicle

Abstract

The invention relates to a battery, a battery pack and a vehicle. The battery comprises a shell, a cover plate assembly, an electrode assembly and a current collecting assembly, the shell is provided with an opening; the cover plate assembly comprises a cover plate and a pole arranged on the cover plate, the cover plate covers the opening, and the pole is provided with a liquid injection hole; the electrode assembly is accommodated in the shell, and the electrode assembly comprises a first tab and is provided with a central hole; the current collecting assembly comprises a supporting shaft electrically connected to the first electrode lug, the supporting shaft is connected to the electrode column, at least part of the supporting shaft is inserted into the center hole, the supporting shaft is provided with a first through hole, and the first through hole is communicated with the liquid injection hole.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, in particular to batteries, batteries and electrical devices. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. During the charge and discharge cycle, the volume of the battery expands during charging and shrinks during discharging. During the charge and discharge cycle, the electrode assembly near the center hole will collapse due to its low strength, resulting in damage to the interface of the electrode assembly, and the risk of lithium deposition and short circuit. Summary of the invention

[0003] The present application provides a battery, a battery pack and an electrical device, which are intended to reduce the risk of battery short circuit to a certain extent.

[0004] In the first aspect, the present application proposes a battery, comprising a shell, a cover plate assembly, an electrode assembly and a current collecting assembly; the shell has an opening; the cover plate assembly comprises a cover plate and a pole arranged on the cover plate, the cover plate covers the opening, and the pole is provided with an injection hole; the electrode assembly is accommodated in the shell, the electrode assembly comprises a first pole ear and is provided with a center hole; the current collecting assembly comprises a support shaft electrically connected to the first pole ear, the support shaft is connected to the pole, and at least a portion of the support shaft is inserted into the center hole, the support shaft is provided with a first through hole, and the first through hole is connected to the injection hole.

[0005] According to the battery provided in the present application, it includes a shell, a cover plate assembly, an electrode assembly and a current collecting assembly, the shell has an opening, the cover plate assembly includes a cover plate and a pole arranged on the cover plate, the cover plate covers the opening, the pole is provided with an injection hole, the electrode assembly is accommodated in the shell, the electrode assembly includes a first pole ear and is provided with a center hole, the current collecting assembly includes a support shaft electrically connected to the first pole ear, at least part of the support shaft is inserted into the center hole, during the battery charging and discharging process, it can provide support force for the electrode assembly, improve the geometric structure consistency of the electrode assembly during the charging and discharging process, reduce the probability of collapse of the electrode assembly, thereby improving the overall structural stability of the battery, reducing the occurrence of lithium plating, and improving the reliability of the battery.

[0006] According to one embodiment of the present application, the electrode assembly further includes an electrode body and a second electrode tab. The second electrode tab and the first electrode tab are arranged on one side of the electrode body close to the cover plate, and the second electrode tab and the first electrode tab have opposite polarities. The center hole passes through the electrode body.

[0007] According to one embodiment of the present application, the current collecting assembly also includes a first current collecting plate and a second current collecting plate; the first current collecting plate is connected to the first pole ear, and the support shaft passes through the first current collecting plate and is connected to the pole; the second current collecting plate is spaced apart from the first current collecting plate, and the second current collecting plate is electrically connected to the second pole ear and the cover plate.

[0008] According to an embodiment of the present application, the first pole tab, the second pole tab and the opening of the center hole are staggered, the first pole tab is spaced apart from the edge of the electrode body, and the second pole tab is spaced apart from the edge of the electrode body.

[0009] According to one embodiment of the present application, along the axial direction of the central hole, the projected area of ​​the first electrode tab on the electrode body is smaller than the projected area of ​​the second electrode tab on the electrode body.

[0010] According to an embodiment of the present application, the current collecting assembly further includes a bracket, the bracket includes a bracket body connected to the second current collecting plate and the shell, the bracket body is provided with a mounting groove, and the first current collecting plate is embedded in the mounting groove.

[0011] According to one embodiment of the present application, the bracket body includes a first protrusion, and the first protrusion extends relative to the bracket body toward the second collecting plate;

[0012] The second current collecting plate is welded to the second pole ear to form a second welding portion, the second welding portion includes a first concave portion, the first concave portion is concave relative to the side surface of the second welding portion toward the first convex portion, and the first concave portion is engaged and connected with the first convex portion.

[0013] According to an embodiment of the present application, the bracket further includes a flange connected to the edge of the bracket body and folded along the axial direction, and the flange abuts against the inner wall surface of the shell.

[0014] According to one embodiment of the present application, the second collecting plate includes a second protrusion, the second protrusion is connected to the second welding portion, the second protrusion extends toward the bracket body relative to the second welding portion, and the second protrusion is provided with a connecting hole for connecting with the bracket body.

[0015] According to an embodiment of the present application, the second welding portion is provided with a plurality of second liquid guide holes which are arranged at intervals, and the second liquid guide holes extend along the radial direction of the second welding portion.

[0016] According to an embodiment of the present application, the second current collecting plate further includes a pin, which is connected to an edge of the second welding portion and folded along the axial direction, and the pin abuts against an inner wall surface of the shell.

[0017] According to an embodiment of the present application, the pin and the flange are arranged on the same circumference, and the size of the pin along the axial direction is equal to the size of the flange along the axial direction.

[0018] According to one embodiment of the present application, the first current collecting plate is welded to the first pole ear and forms a first welding portion, the first current collecting plate includes a third protrusion, the third protrusion extends toward the first protrusion relative to the first welding portion, the third protrusion abuts against the first protrusion, the third protrusion is provided with a second through hole, the support shaft passes through the second through hole and is connected to the hole wall of the second through hole.

[0019] According to an embodiment of the present application, a positioning groove is provided on the edge of the first collecting plate, the positioning groove is recessed inward relative to the edge, and the positioning groove is snap-fitted with the inner wall surface of the mounting groove.

[0020] According to an embodiment of the present application, the first welding portion is provided with a plurality of first liquid guiding holes which are arranged at intervals, and the first liquid guiding holes extend along the radial direction of the first welding portion.

[0021] According to one embodiment of the present application, the support shaft includes a shaft body, a first step portion, a second step portion and a first connecting portion arranged in sequence along the axial direction, the first through hole passes through the shaft body, the first step portion, the second step portion and the first connecting portion, the shaft body is at least partially inserted into the center hole, the first step portion is clamped with the hole wall of the second through hole, and the first connecting portion is passed through the second through hole and connected to the pole.

[0022] According to one embodiment of the present application, the support shaft is provided with a hollow groove along the thickness direction of the support shaft, the number of the hollow grooves is multiple, and the multiple hollow grooves are arranged at intervals along the axial direction.

[0023] According to an embodiment of the present application, the cover plate is provided with a receiving groove, the pole is arranged in the receiving groove, a positioning step portion is provided in the circumference of the cover plate, and the positioning step portion is connected to the housing;

[0024] The cover plate assembly also includes an isolating member disposed between the cover plate and the pole.

[0025] According to one embodiment of the present application, the injection hole includes a sealing hole, a third through hole and a limiting hole arranged in sequence along the axial direction.

[0026] The hole wall of the third through hole is connected to the first connecting portion, and the hole wall of the limiting hole is clamped with the second step portion.

[0027] According to one embodiment of the present application, the cover plate assembly further includes a seal, which is disposed in the sealing hole, and a portion of the seal passes through the third through hole and the limiting hole and is inserted into the first through hole.

[0028] In a second aspect, the present application provides a battery pack comprising a plurality of batteries according to the foregoing.

[0029] In a third aspect, the present application provides a vehicle comprising a battery pack according to the aforementioned method.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0032] Figure 1 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0034] Figure 3 Schematic diagram of the cross-sectional structure of batteries in some embodiments of the present application;

[0035] Figure 4 for Figure 3 An enlarged view of a portion of a battery of some embodiments shown;

[0036] Figure 5 A schematic diagram of the structure of an electrode assembly of a battery according to some embodiments of the present application;

[0037] Figure 6 A top view of an electrode assembly of a battery according to some embodiments of the present application;

[0038] Figure 7 A schematic diagram of the exploded structure of a current collecting assembly of a battery according to some embodiments of the present application;

[0039] Figure 8 A schematic diagram of the structure of a current collecting assembly of a battery in some embodiments of the present application;

[0040] Fig. 9 A schematic cross-sectional structure diagram of a current collecting assembly of a battery in some embodiments of the present application;

[0041] Fig.10 A schematic diagram of the exploded structure of a cover assembly of a battery according to some embodiments of the present application;

[0042] Fig.11 A top view of a cover assembly of a battery according to some embodiments of the present application;

[0043] Fig.12 A schematic cross-sectional structure diagram of a cover assembly of a battery according to some embodiments of the present application;

[0044] The drawings are not necessarily drawn to scale.

[0045] Description of reference numerals:

[0046] 100. Battery;

[0047] 10. housing; 11. opening;

[0048] 20. Cover plate assembly; 21. Cover plate; 211. Accommodating groove; 212. Positioning step portion;

[0049] 22, pole; 221, injection hole; 2211, sealing hole; 2212, third through hole; 2213, limit hole;

[0050] 23. Isolation member; 24. Sealing member;

[0051] 30. electrode assembly; 31. center hole; 32. first pole ear; 33. electrode body; 34. second pole ear;

[0052] 40. Current collecting assembly; 41. Support shaft; 411. First through hole; 412. Shaft body; 413. First step; 414. Second step; 415. First connecting portion; 416. Hollow groove; 42. First collecting plate; 421. Third convex portion; 4211. Second through hole; 422. Positioning groove; 43. Second collecting plate; 431. Second convex portion; 4311. Connecting hole; 432. Pin; 44. Bracket; 441. Bracket body; 4411. Mounting groove; 4412. First convex portion; 442. Flanging; 45. Second welding portion; 451. First concave portion; 452. Second liquid guide hole; 46. First welding portion; 461. First liquid guide hole;

[0053] Axis direction x. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0056] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0059] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0060] The term "plurality" used in the present application refers to two or more (including two).

[0061] Combined with reference Figures 1 to 6 , Figure 1 A schematic diagram of the structure of a battery in some embodiments of the present application; Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application; Figure 3Schematic diagram of the cross-sectional structure of batteries in some embodiments of the present application; Figure 4 for Figure 3 An enlarged view of a portion of a battery of some embodiments shown; Figure 5 A schematic diagram of the structure of an electrode assembly of a battery according to some embodiments of the present application; Figure 6 A top view of an electrode assembly of a battery according to some embodiments of the present application.

[0062] like Figures 1 to 6 As shown, the present application proposes a battery 100, including a shell 10, a cover assembly 20, an electrode assembly 30 and a current collecting assembly 40; the shell 10 has an opening 11; the cover assembly 20 includes a cover 21 and a pole 22 arranged on the cover 21, the cover 21 covers the opening 11, and the pole 22 is provided with an injection hole 221; the electrode assembly 30 is accommodated in the shell 10, the electrode assembly 30 includes a first pole ear 32 and is provided with a center hole 31; the current collecting assembly 40 includes a support shaft 41 electrically connected to the first pole ear 32, the support shaft 41 is connected to the pole 22, and at least a portion of the support shaft 41 is inserted into the center hole 31, the support shaft 41 is provided with a first through hole 411, and the first through hole 411 is connected to the injection hole 221.

[0063] The shell 10 is a component used to cooperate with the cover assembly 20 to form the internal environment of the battery 100, wherein the formed internal environment can be used to accommodate the electrode assembly 30, the electrolyte and other components. An opening 11 is provided on the shell 10, and the internal environment of the battery 100 is formed by covering the opening 11 with the cover assembly 20 at the opening 11. Specifically, the cover assembly 20 and the shell 10 can form a common connection surface before other components are put into the shell, and when the interior of the shell 10 needs to be encapsulated, the cover assembly 20 is used to cover the shell 10. The shell 10 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 10 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0064] Optionally, the housing 10 is cylindrical.

[0065] The cover assembly 20 refers to a component that covers the opening 11 of the housing 10 to isolate the internal environment of the battery 100 from the external environment. Without limitation, the shape of the cover assembly 20 can be adapted to the shape of the housing 10 to match the housing 10. Optionally, it can be made of a material with a certain hardness and strength (such as aluminum alloy), so that it is not easy to deform when squeezed and collided, so that the battery 100 can have a higher structural strength and the safety performance can also be improved.

[0066] In the embodiment of the present application, the cover plate assembly 20 includes a cover plate 21 and a pole 22, the cover plate 21 covers the opening 11, and the pole 22 is used to be electrically connected to the first pole ear 32 of the electrode assembly 30, so as to output or input the electric energy of the battery 100. The material of the cover plate 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0067] Optionally, the cover plate 21 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery 100 reaches a threshold value.

[0068] The electrode assembly 30 is a component in the battery 100 where electrochemical reactions occur. The housing 10 may contain one or more electrode assemblies 30. The electrode assembly 30 includes a positive electrode sheet, a negative electrode sheet and a separator 23. The electrode assembly 30 is mainly formed by winding the positive electrode sheet, the separator 23 and the negative electrode sheet. When the electrode assembly 30 is wound, the positive electrode sheet, the negative electrode sheet and the separator are wound around the winding axis for a certain number of turns. The inner circle of the electrode assembly 30 encloses a central hole 31, and the starting end of the winding of the electrode assembly 30 is located in the central hole 31. The positive electrode sheet and the negative electrode sheet include a part with active material and a part without active material. The parts of the positive electrode sheet and the negative electrode sheet without active material each constitute a pole ear. The positive pole ear and the negative pole ear can be located at one end of the main body or at both ends of the main body respectively. One of the positive pole ear and the negative pole ear is a first pole ear 32.

[0069] The current collecting assembly 40 is used to electrically connect the electrode assembly 30 to the cap plate assembly 20 .

[0070] In the embodiment of the present application, at least part of the support shaft 41 is inserted into the central hole 31, which can be understood as the pole 22 includes a first part and a second part, the first part is connected to the pole 22, and the second part is inserted into the central hole 31, wherein the first part is electrically connected to the first pole ear 32, the first part can be directly connected to the first pole ear 32, and the first part can also be electrically connected to the first pole ear 32 through a connector. The support shaft 41 is provided in the central hole 31 of the electrode assembly 30, which can reduce the deformation degree of the electrode assembly 30 to limit the occurrence of lithium plating, thereby improving the cycle life of the battery 100.

[0071] Optionally, the current collecting assembly 40 may further include a current collecting piece, which is electrically connected to the other of the positive electrode tab and the negative electrode tab, and the other is electrically connected to the cover plate 21 through the shell 10 .

[0072] Optionally, the axis of the support shaft 41 coincides with the center line of the center hole 31 .

[0073] According to the battery 100 provided in the present application, it includes a shell 10, a cover plate assembly 20, an electrode assembly 30 and a current collecting assembly 40, the shell 10 has an opening 11, the cover plate assembly 20 includes a cover plate 21 and a pole 22 arranged on the cover plate 21, the cover plate 21 covers the opening 11, the pole 22 is provided with an injection hole 221 for injecting electrolyte, the electrode assembly 30 is accommodated in the shell 10, the electrode assembly 30 includes a first pole ear 32 and is provided with a center hole 31, the current collecting assembly 40 includes a support shaft 41 electrically connected to the first pole ear 32, at least a portion of the support shaft 41 is inserted into the center hole 31, during the charging and discharging process of the battery 100, it can provide support force for the electrode assembly 30, improve the geometric structure consistency of the electrode assembly 30 during the charging and discharging process, and reduce the probability of collapse of the electrode assembly 30, thereby improving the overall structural stability of the battery 100, reducing the occurrence of lithium plating, and improving the reliability of the battery 100.

[0074] According to the battery 100 provided in the present application, the support shaft 41 of the current collecting assembly 40 is connected to the pole 22, and at least a portion of the support shaft 41 is inserted into the central hole 31, which guides the assembly between the current collecting assembly 40 and the electrode assembly 30, and between the current collecting assembly 40 and the cover assembly 20, and can improve the assembly accuracy between the current collecting assembly 40 and the electrode assembly 30, and between the current collecting assembly 40 and the cover assembly 20. In addition, the injection hole 221 provided on the pole 22 is connected to the first through hole 411 provided on the support shaft 41, and the electrolyte is injected into the battery 100 through the injection hole 221 and the first through hole 411. The design of the first through hole 411 and the injection hole 221 can reduce the resistance of the electrolyte and the obstruction on the flow path, thereby improving the injection efficiency.

[0075] According to one embodiment of the present application, Figure 2 , Figure 4 and Figure 5 As shown, the electrode assembly 30 also includes an electrode body 33 and a second pole ear 34 . The second pole ear 34 and the first pole ear 32 are arranged on one side of the electrode body 33 close to the cover plate, and the second pole ear 34 and the first pole ear 32 have opposite polarities. The center hole 31 passes through the electrode body 33 .

[0076] In an embodiment of the present application, the electrode assembly 30 includes a first pole ear 32, an electrode body 33 and a second pole ear 34; the portion of the positive pole sheet and the negative pole sheet having active materials constitutes the electrode body 33 of the electrode assembly 30, and the portion of the positive pole sheet and the negative pole sheet not having active materials each constitutes a pole ear, one of the positive pole ear and the negative pole ear is the first pole ear 32, and the other is the second pole ear 34, that is, the polarities of the first pole ear 32 and the second pole ear 34 are opposite, and the first pole ear 32 and the second pole ear 34 are jointly located on the side of the electrode body 33 close to the cover plate 21.

[0077] Optionally, the first electrode tab 32 is a positive electrode tab, and the second electrode tab 34 is a negative electrode tab.

[0078] According to one embodiment of the present application, the current collecting assembly 40 further includes a first current collecting disc 42 and a second current collecting disc 43, the first current collecting disc 42 is connected to the first pole lug 32, the support shaft 41 passes through the first current collecting disc 42 and is connected to the pole 22. The second current collecting disc 43 is spaced apart from the first current collecting disc 42, and the second current collecting disc 43 is electrically connected to the second pole lug 34 and the cover plate 21.

[0079] In an embodiment of the present application, the current collecting assembly 40 includes a support shaft 41, a first current collecting disc 42 and a second current collecting disc 43, and the second current collecting disc 43 is electrically connected to the second pole lug 34 and the cover plate 21 to form an electrical transmission path of the second pole lug 34. Specifically, the second current collecting disc 43 can be connected to the housing 10, and the second current collecting disc 43 is electrically connected to the cover plate 21 through the housing 10, so as to achieve conduction between the second pole lug 34 and the cover plate 21. The first current collecting disc 42 is connected to the first pole lug 32, and the support shaft 41 passes through the first current collecting disc 42 and is connected to the pole 22 to achieve the electrical transmission path of the first pole lug 32.

[0080] In these optional embodiments, the second current collecting disk 43 is electrically connected to the second pole ear 34 and the cover plate 21, the first current collecting disk 42 is connected to the first pole ear 32, the support shaft 41 passes through the first current collecting disk 42 and is connected to the pole 22. Through the above electrical connection relationship, the pole 22 can be realized as one of the positive output terminal and the negative output terminal, and the cover plate 21 is the other. Moreover, by concentrating the first pole ear 32 and the second pole ear 34 on the side of the electrode body 33 close to the cover plate 21, and cooperating with the current collecting assembly 40, the conductive distance between the first pole ear 32 and the pole 22, and the second pole ear 34 and the cover plate 21 can be effectively shortened, the overall resistance of the battery 100 is reduced, and the rate performance of the battery 100 is improved. In addition, such a configuration makes the overall structure of the battery 100 more compact, reduces the space occupancy rate of the current collecting assembly 40 inside the shell 10, and improves the space utilization rate of the electrode assembly 30 inside the shell 10, thereby improving the energy density of the battery 100.

[0081] According to one embodiment of the present application, Figure 5 and Figure 6 As shown, the first pole ear 32, the second pole ear 34 and the opening 11 of the center hole 31 are staggered, the first pole ear 32 is spaced apart from the edge of the electrode body 33, and the second pole ear 34 is spaced apart from the edge of the electrode body 33. Such a setting can reduce the mutual influence between the first pole ear 32 and the second pole ear 34, and improve the stability of power transmission.

[0082] According to one embodiment of the present application, Figure 5 and Figure 6As shown, along the axial direction x of the central hole 31 , the projection area of ​​the first electrode tab 32 on the electrode body 33 is smaller than the projection area of ​​the second electrode tab 34 on the electrode body 33 .

[0083] In the embodiment of the present application, along the axial direction x of the center hole 31, the projected area of ​​the first pole ear 32 on the electrode body 33 is smaller than the projected area of ​​the second pole ear 34 on the electrode body 33. It can be understood that the first pole ear 32 and the second pole ear 34 are formed or sized differently to facilitate the distinction between the first pole ear 32 and the second pole ear 34.

[0084] Optionally, the projection of the first pole tab 32 on the electrode body 33 is arc-shaped, the projection of the second pole tab 34 on the electrode body 33 is arc-shaped, and the projection area of ​​the second pole tab 34 is larger than the projection area of ​​the first pole tab 32 .

[0085] Optionally, the opening 11 of the central hole 31 is located between the first pole tab 32 and the second pole tab 34 .

[0086] In these optional embodiments, the differentiated design of the first electrode tab 32 and the second electrode tab 34 can play a visual fool-proofing role, thereby reducing the possibility of incorrect assembly of the electrode assembly 30 and the current collecting assembly 40 .

[0087] Combined with reference Figures 7 to 9 , Figure 7 A schematic diagram of the exploded structure of a current collecting assembly of a battery according to some embodiments of the present application; Figure 8 A schematic diagram of the structure of a current collecting assembly of a battery in some embodiments of the present application; Fig. 9 Schematic diagram of the cross-sectional structure of the current collecting assembly of the battery according to some embodiments of the present application.

[0088] According to one embodiment of the present application, Figure 2 , Figures 7 to 9 As shown, the current collecting assembly 40 further includes a bracket 44 , which includes a bracket body 441 connected to the second current collecting plate 43 and the shell 10 . The bracket body 441 is provided with a mounting groove 4411 , and the first current collecting plate 42 is embedded in the mounting groove 4411 .

[0089] In an embodiment of the present application, the current collecting assembly 40 includes a bracket 44, the bracket 44 includes a bracket body 441, the bracket body 441 is connected to the second current collecting plate 43 and the shell 10, the bracket body 441 is provided with a mounting groove 4411, and the first current collecting plate 42 is embedded in the mounting groove 4411. It can be understood that the bracket 44 is covered on the first current collecting plate 42 and is fixedly connected to the second current collecting plate 43.

[0090] Optionally, the first current collecting plate 42 , the second current collecting plate 43 and the bracket 44 are on the same plane.

[0091] In the embodiment of the present application, the bracket 44 is made of an insulating material to achieve insulation between the first current collecting disc 42 and the second current collecting disc 43. The bracket 44 and the first current collecting disc 42 can be connected by means of snap connection, plug connection, bonding, welding, and connection with a connector. The bracket 44 and the first current collecting disc 42 can be connected by means of snap connection, plug connection, bonding, welding, and connection with a connector.

[0092] In these optional embodiments, the bracket 44 serves to fix and insulate the first current collecting plate 42 and the second current collecting plate 43 , and the bracket 44 can be used to ensure that the first current collecting plate 42 and the second current collecting plate 43 are on the same plane, thereby further reducing the space occupied by the current collecting assembly 40 in the shell 10 .

[0093] According to one embodiment of the present application, Figure 7 and Fig. 9 As shown, the bracket body 441 includes a first convex portion 4412, and the first convex portion 4412 extends relative to the bracket body 441 toward the second current collecting plate 43. The second current collecting plate 43 is welded to the second pole lug 34 to form a second welding portion 45, and the second welding portion 45 includes a first concave portion 451, and the first concave portion 451 is concave relative to the side surface of the second welding portion 45 in the direction of the first convex portion 4412, and the first concave portion 451 is engaged and connected with the first convex portion 4412.

[0094] Specifically, the bracket body 441 is semicircular, and a mounting groove 4411 is provided in the semicircular shape. A first convex portion 4412 extending toward the second current collecting plate 43 relative to the bracket body 441 is designed in the middle of the semicircular straight edge. The first convex portion 4412 is semicircular. The first current collecting plate 42 is arranged in the mounting groove 4411 and matches the shape of the mounting groove 4411. The first current collecting plate 42 is approximately semicircular, and a first concave portion 451 is provided on the side of the semicircular straight edge that is concave toward the bracket 44. The first concave portion 451 is engaged and connected with the first convex portion 4412 to fix the second current collecting plate 43 and the bracket 44.

[0095] In these optional embodiments, such a configuration can simplify the assembly between the bracket 44, the first collecting plate 42 and the second collecting plate 43, which is not only conducive to achieving the first collecting plate 42 and the second collecting plate 43 on the same plane, but also can reduce the manufacturing cost of the current collecting assembly 40.

[0096] According to one embodiment of the present application, Figure 4 , Figures 7 to 9 As shown, the bracket 44 further includes a flange 442 connected to the edge of the bracket body 441 and folded along the axial direction x, and the flange 442 abuts against the inner wall surface of the shell 10 .

[0097] Specifically, the bracket body 441 is semicircular, and a flange 442 is provided on the arc edge of the semicircle. The flange 442 is folded along the axial direction x toward the direction of the cover assembly 20.

[0098] Optionally, the flange 442 is provided with a plurality of reinforcing ribs, so as to enhance the structural strength of the flange 442.

[0099] According to one embodiment of the present application, Figure 4 , Figure 7 and Fig. 9 As shown, the second collecting plate 43 includes a second protrusion 431, which is connected to the second welding portion 45, and extends toward the bracket body 441 relative to the second welding portion 45. The second protrusion 431 is provided with a connecting hole 4311, which is used to connect with the bracket body 441.

[0100] Specifically, the bracket 44 is injection molded. The bracket 44 wraps around the first collecting plate 42 by injection molding, covers the connecting hole 4311 on the second protrusion 431 and is fixed to the second collecting plate 43 to form the bracket 44, the first collecting plate 42 and the second collecting plate 43 into a whole.

[0101] According to an embodiment of the present application, the second welding portion 45 is provided with a plurality of second liquid guiding holes 452 arranged at intervals, and the second liquid guiding holes 452 extend along the radial direction of the second welding portion 45 .

[0102] In the embodiment of the present application, the second welding portion 45 is provided with a plurality of second liquid guide holes 452, and the plurality of second liquid guide holes 452 are arranged at intervals. Optionally, the plurality of second liquid guide holes 452 are arranged at intervals along the circumference of the second welding portion 45, and each second liquid guide hole 452 extends along the radial direction of the second welding portion 45. The second liquid guide holes 452 form a waist-shaped hole structure.

[0103] According to one embodiment of the present application, Figure 4 , Figures 7 to 9 As shown, the second current collecting plate 43 further includes a pin 432 , which is connected to the edge of the second welding portion 45 and folded along the axial direction x. The pin 432 abuts against the inner wall surface of the housing 10 .

[0104] In the embodiment of the present application, the second current collecting plate 43 further includes a pin 432, which is connected to the edge of the second welding portion 45 and is folded along the axial direction x, and optionally, the flipping direction of the pin 432 is the same as the flipping direction of the flange 442, and the pin 432 abuts against the inner wall surface of the shell 10. In this way, the pin 432 has a greater contact with the inner wall surface of the shell 10, which can improve the connection stability between the current collecting assembly 40 and the shell 10.

[0105] According to one embodiment of the present application, Figures 7 to 9 As shown, the pin 432 and the flange 442 are arranged on the same circumference, and the size of the pin 432 along the axial direction x is equal to the size of the flange 442 along the axial direction x.

[0106] In the embodiment of the present application, the pin 432 and the flange 442 are arranged on the same circumference. After the collecting plate assembly is put into the shell, the pin 432 and the flange 442 are matched and pressed against the inner wall of the shell 10, which is conducive to the welding of the second collecting plate 43 and the shell 10. In the axial direction x, the size of the pin 432 is equal to the size of the flange 442, so that the cover plate assembly 20 has a high balance.

[0107] According to one embodiment of the present application, Figure 4 , Figures 7 to 9 As shown, the first current collecting disk 42 is welded to the first pole ear 32 and forms a first welding portion 46. The first current collecting disk 42 includes a third protrusion 421. The third protrusion 421 extends toward the first protrusion 4412 relative to the first welding portion 46. The third protrusion 421 abuts against the first protrusion 4412. The third protrusion 421 is provided with a second through hole 4211. The support shaft 41 passes through the second through hole 4211 and is connected to the hole wall of the second through hole 4211.

[0108] In an embodiment of the present application, the first current collecting disk 42 is provided with a second through hole 4211, the support shaft 41 passes through the second through hole 4211 and is connected to the pole 22, and the support shaft 41 is connected to the hole wall of the second through hole 4211, and the first current collecting disk 42 is welded to the first pole ear 32 and forms a first welding portion 46 to realize electrical connection between the first pole ear 32 and the pole 22.

[0109] According to one embodiment of the present application, Figure 7 As shown, a positioning groove 422 is provided on the edge of the first current collecting plate 42 . The positioning groove 422 is recessed inwardly relative to the edge, and the positioning groove 422 is snap-fitted with the inner wall surface of the mounting groove 4411 .

[0110] Specifically, the bracket 44 is injection molded. The bracket 44 wraps around the first current collecting plate 42 by injection molding, and covers the positioning groove 422 on the edge of the first current collecting plate 42 to be fixed.

[0111] Specifically, a plurality of positioning grooves 422 are provided on the edge of the first current collecting plate 42 , and the plurality of positioning grooves 422 are arranged at intervals along the circumference of the edge of the first current collecting plate 42 .

[0112] In these optional embodiments, the positioning groove 422 is configured to cooperate with the inner wall surface of the installation groove 4411 for positioning, which can further improve the connection stability between the first collecting plate 42 and the bracket 44.

[0113] According to an embodiment of the present application, the first welding portion 46 is provided with a plurality of first liquid guiding holes 461 arranged at intervals, and the first liquid guiding holes 461 extend along the radial direction of the first welding portion 46 .

[0114] In the embodiment of the present application, the first welding portion 46 is provided with a plurality of first liquid guide holes 461, and the plurality of first liquid guide holes 461 are arranged at intervals. Optionally, the plurality of first liquid guide holes 461 are arranged at intervals along the circumference of the first welding portion 46, and each first liquid guide hole 461 extends along the radial direction of the first welding portion 46. Thus, the first liquid guide holes 461 form a waist-shaped hole structure.

[0115] According to one embodiment of the present application, Figure 4 , Figures 7 to 9 As shown, the support shaft 41 includes a shaft body 412, a first step portion 413, a second step portion 414 and a first connecting portion 415 which are arranged in sequence along the axial direction x, the first through hole 411 passes through the shaft body 412, the first step portion 413, the second step portion 414 and the first connecting portion 415, the shaft body 412 is at least partially inserted into the center hole 31, the first step portion 413 is clamped with the hole wall of the second through hole 4211, and the first connecting portion 415 is penetrated through the second through hole 4211 and connected to the pole 22.

[0116] In the embodiment of the present application, the support shaft 41 passes through the current collector assembly 40 and is connected to the pole 22. The support shaft 41 includes a shaft body 412, a first step portion 413, a second step portion 414 and a first connecting portion 415 arranged in sequence along the axial direction x. The support shaft 41 is inserted into the central hole 31, and the first step portion 413 is engaged with the hole wall of the second through hole 4211 to achieve the connection and positioning of the support shaft 41 and the first current collector. The first connecting portion 415 is passed through the second through hole 4211 and connected to the pole 22 to achieve the connection of the support shaft 41 and the pole 22.

[0117] Optionally, the first step portion 413 , the second step portion 414 and the first connecting portion 415 are all in a circular ring shape.

[0118] Specifically, the outer diameter of the shaft body 412 is greater than the outer diameter of the first step portion 413 , and the outer diameter of the second step portion 414 is greater than the outer diameter of the first connection portion 415 .

[0119] Optionally, the shaft body 412 , the first step portion 413 , the second step portion 414 and the first connecting portion 415 are an integrated structure.

[0120] In these optional embodiments, the first step portion 413 is engaged with the hole wall of the second through hole 4211, which can guide the support shaft 41 and the first current collector to be assembled, and ensure that the support shaft 41 and the first current collector are assembled in place, thereby improving the assembly accuracy of the support shaft 41 and the first current collector.

[0121] According to one embodiment of the present application, Figure 8 As shown, the support shaft 41 is provided with a hollow groove 416 along the thickness direction of the support shaft 41 , and the number of the hollow grooves 416 is multiple, and the multiple hollow grooves 416 are arranged at intervals along the axial direction x.

[0122] In these optional embodiments, the support shaft 41 is provided with a hollow groove 416, which can reduce the overall weight of the support shaft 41, which is conducive to the lightweight of the battery 100. Moreover, it is also conducive to the electrolyte flowing into the electrode assembly 30 through the hollow groove 416, accelerating the injection of the electrolyte.

[0123] According to another embodiment of the present application, the wall thickness of the support shaft 41 decreases along the axial direction toward the pole 22. Such a configuration can satisfy the requirement of achieving stable support for the electrode assembly, and can reduce the overall weight of the support shaft 41, which is conducive to lightweighting of the battery 100.

[0124] Combined with reference Figures 10 to 12 , Fig.10 A schematic diagram of the exploded structure of a cover assembly of a battery according to some embodiments of the present application; Fig.11 A top view of a cover assembly of a battery according to some embodiments of the present application; Fig.12 Schematic diagram of the cross-sectional structure of the cover assembly of the battery according to some embodiments of the present application.

[0125] According to one embodiment of the present application, Figure 4 , Figures 10 to 12 As shown, the cover plate 21 is provided with a receiving groove 211, the pole 22 is arranged in the receiving groove 211, and the cover plate 21 is provided with a positioning step 212 in the circumference, and the positioning step 212 is connected to the housing 10. The cover plate assembly 20 also includes an isolating member 23, which is arranged between the cover plate 21 and the pole 22.

[0126] In the embodiment of the present application, the cover plate assembly 20 includes a cover plate 21, a pole 22 and an isolating member 23. The cover plate 21 is provided with a receiving groove 211, the pole 22 and the isolating member 23 are assembled into the receiving groove 211, and the isolating member 23 is arranged between the pole 22 and the cover plate 21 for sealing and insulation. The cover plate 21 is provided with a positioning step 212 in the circumference, and the positioning step 212 is connected to the housing 10 to achieve the connection and fixation of the cover plate 21 and the housing 10.

[0127] Optionally, the isolating member 23 includes a sealing ring made of insulating material.

[0128] According to one embodiment of the present application, Figure 4 , Figures 10 to 12As shown, the injection hole 221 includes a sealing hole 2211, a third through hole 2212 and a limiting hole 2213 arranged in sequence along the axial direction x, the hole wall of the third through hole 2212 is connected to the first connecting portion 415, and the hole wall of the limiting hole 2213 is clamped with the second step portion 414.

[0129] In an embodiment of the present application, the pole 22 is provided with an injection hole 221 passing through along the axial direction x, the injection hole 221 includes a sealing hole 2211, a third through hole 2212 and a limiting hole 2213, the sealing hole 2211, the third through hole 2212 and the limiting hole 2213 are connected, the hole wall of the limiting hole 2213 is engaged with the second step portion 414 of the support shaft 41 to ensure that the support shaft 41 and the pole 22 are assembled in place, and the hole wall of the third through hole 2212 is connected to the first connecting portion 415 of the support shaft 41 to connect the support shaft 41 with the pole 22.

[0130] Optionally, the hole wall of the third through hole 2212 is welded to the first connecting portion 415 of the support shaft 41 .

[0131] According to one embodiment of the present application, Figure 1 , Figures 10 to 12 As shown, the cover plate assembly 20 further includes a sealing member 24 , which is disposed in the sealing hole 2211 , and a portion of the sealing member 24 passes through the third through hole 2212 , the limiting hole 2213 , and is inserted into the first through hole 411 .

[0132] In an embodiment of the present application, the cover plate assembly 20 also includes a seal 24, which is disposed in the sealing hole 2211. After the electrolyte is injected into the battery 100, the seal 24 is disposed in the sealing hole 2211 to seal the pole 22, thereby forming a closed space inside the battery 100.

[0133] Specifically, the seal 24 includes a rubber nail and an aluminum nail. The rubber nail is arranged between the sealing hole 2211 and the aluminum nail. A part of the aluminum nail is arranged in the sealing hole 2211, and the other part passes through the third through hole 2212 and the limiting hole 2213 and is inserted into the first through hole 411.

[0134] According to one embodiment of the present application, the assembly of the battery 100 includes: connecting the electrode assembly 30 with the current collecting assembly 40 so that the first pole ear 32 is connected to the first current collecting disk 42, the second pole ear 34 is connected to the second current collecting disk 43, and the support shaft 41 is inserted into the center hole 31 of the electrode assembly 30; loading the connected electrode assembly 30 and the current collecting assembly 40 into the shell 10; connecting the current collecting assembly 40 with the shell 10 so that the second current collecting disk 43 is connected to the shell 10, and the bracket 44 is connected to the shell 10; covering the opening 11 of the shell 10 with the cover plate, and connecting the support shaft 41 with the pole 22; injecting electrolyte so that the electrolyte flows into the battery 100 through the injection hole 221 and the first through hole 411; connecting the seal 24 with the pole 22.

[0135] In a second aspect, the present application provides a battery pack comprising a plurality of batteries according to the foregoing.

[0136] In a third aspect, the present application provides a vehicle comprising a battery pack according to the aforementioned method.

[0137] The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery may be arranged inside the vehicle, for example, at the bottom, front or rear of the vehicle, and the battery may be used to power the vehicle.

[0138] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: include: a housing having an opening; A cover plate assembly, comprising a cover plate and a pole arranged on the cover plate, wherein the cover plate covers the opening, and the pole is provided with a liquid injection hole; An electrode assembly, contained in the housing, wherein the electrode assembly includes a first electrode tab and is provided with a central hole; The current collecting assembly comprises a support shaft electrically connected to the first pole ear, the support shaft is connected to the pole, and at least a portion of the support shaft is inserted into the center hole. The support shaft is provided with a first through hole, and the first through hole is connected to the injection hole.

2. The battery according to claim 1, characterized in that The electrode assembly further includes an electrode body and a second electrode tab. The second electrode tab and the first electrode tab are arranged on a side of the electrode body close to the cover plate, and the second electrode tab and the first electrode tab have opposite polarities. The center hole passes through the electrode body.

3. The battery according to claim 2, characterized in that The current collecting assembly further comprises: A first current collecting plate connected to the first pole lug, wherein the support shaft passes through the first current collecting plate and is connected to the pole; The second current collecting disk is spaced apart from the first current collecting disk, and the second current collecting disk is electrically connected to the second electrode tab and the cover plate.

4. The battery according to claim 2, characterized in that The first pole tab, the second pole tab and the opening of the center hole are staggered, the first pole tab is spaced apart from the edge of the electrode body, and the second pole tab is spaced apart from the edge of the electrode body.

5. The battery according to claim 2, characterized in that Along the axial direction of the central hole, a projected area of ​​the first electrode tab on the electrode body is smaller than a projected area of ​​the second electrode tab on the electrode body.

6. The battery according to claim 3, characterized in that The current collecting assembly further includes a bracket, which includes a bracket body connected to the second current collecting plate and the shell, and the bracket body is provided with a mounting groove, and the first current collecting plate is embedded in the mounting groove.

7. The battery according to claim 6, characterized in that The support body comprises a first protrusion, and the first protrusion extends relative to the support body toward the second collecting plate; The second current collecting plate is welded to the second pole lug to form a second welding portion, the second welding portion includes a first recessed portion, the first recessed portion is recessed relative to the side surface of the second welding portion in the direction of the first protrusion, and the first recessed portion is engaged and connected with the first protrusion.

8. The battery according to claim 7, characterized in that The bracket also includes a flange connected to the edge of the bracket body and folded along the axial direction, and the flange abuts against the inner wall surface of the shell.

9. The battery according to claim 8, characterized in that The second current collecting plate includes a second protrusion, the second protrusion is connected to the second welding portion, the second protrusion extends toward the bracket body relative to the second welding portion, and the second protrusion is provided with a connecting hole, and the connecting hole is used to connect with the bracket body.

10. The battery according to claim 8, characterized in that The second welding portion is provided with a plurality of second liquid guiding holes arranged at intervals, and the second liquid guiding holes extend along the radial direction of the second welding portion.

11. The battery according to claim 8, characterized in that The second current collecting plate further includes a pin, which is connected to an edge of the second welding portion and folded along an axial direction, and the pin abuts against an inner wall surface of the shell.

12. The battery according to claim 11, characterized in that The pin and the flange are arranged on the same circumference, and the size of the pin along the axial direction is equal to the size of the flange along the axial direction.

13. The battery according to claim 6, characterized in that The first current collecting disk is welded to the first pole ear to form a first welding portion, the first current collecting disk includes a third protrusion, the third protrusion extends toward the first protrusion relative to the first welding portion, the third protrusion abuts against the first protrusion, the third protrusion is provided with a second through hole, the support shaft passes through the second through hole and is connected to the hole wall of the second through hole.

14. The battery according to claim 13, characterized in that A positioning groove is provided on the edge of the first current collecting plate. The positioning groove is recessed inwardly relative to the edge, and the positioning groove is snap-fitted with the inner wall surface of the mounting groove.

15. The battery according to claim 13, characterized in that The first welding portion is provided with a plurality of first liquid guiding holes arranged at intervals, and the first liquid guiding holes extend along the radial direction of the first welding portion.

16. The battery according to claim 13, characterized in that The support shaft includes a shaft body, a first step portion, a second step portion and a first connecting portion arranged in sequence along the axial direction, the first through hole passes through the shaft body, the first step portion, the second step portion and the first connecting portion, the shaft body is at least partially inserted into the center hole, the first step portion is clamped with the hole wall of the second through hole, and the first connecting portion is penetrated through the second through hole and connected to the pole.

17. The battery according to claim 16, characterized in that The support shaft is provided with a hollow groove along the thickness direction of the support shaft, the number of the hollow grooves is multiple, and the multiple hollow grooves are arranged at intervals along the axial direction.

18. The battery according to claim 16, characterized in that The cover plate is provided with a receiving groove, the pole is arranged in the receiving groove, and a positioning step portion is provided in the circumference of the cover plate, and the positioning step portion is connected to the shell; The cover plate assembly further includes an isolating member disposed between the cover plate and the pole.

19. The battery according to claim 16, characterized in that The injection hole includes a sealing hole, a third through hole and a limiting hole arranged in sequence along the axis direction. The hole wall of the third through hole is connected to the first connecting portion, and the hole wall of the limiting hole is clamped with the second step portion.

20. The battery according to claim 19, characterized in that The cover plate assembly further includes a sealing member, which is disposed in the sealing hole. A portion of the sealing member passes through the third through hole and the limiting hole and is inserted into the first through hole.

21. A battery pack, characterized in that: A battery comprising any one of claims 1 to 20.

22. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 21.

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