Battery cell, battery device, and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell part, a pole part and an electrode part, and the shell part defines a containing cavity and is provided with a mounting hole; the electrode component comprises an active substance coating part and a conductive part, the active substance coating part is accommodated in the accommodating cavity, and the conductive part is connected with the active substance coating part; the pole component is arranged at the mounting hole and is connected with the shell component, the pole component comprises a first part and a second part, the first part is connected with the conductive part, the second part is used for being connected with a confluence component connected with the plurality of battery monomers, and the confluence component is connected with the shell component. The first part and the second part are different parts of the pole part, so that the conductive part and the confluence part are arranged in a staggered manner. According to the technical scheme, the conductive part and the confluence part are respectively connected with different parts of the pole part, so that the thickness of the pole part can be reduced, and the overall weight and cost of the battery monomer can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, the power battery device includes a number of battery cells, however, the material cost of the battery cell is relatively high. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery device, and an electrical device, which are beneficial to reducing the overall material cost of the battery cell.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, a pole component and an electrode component, the shell component defines a accommodating cavity and has a mounting hole; the electrode component comprises an active material coating portion and a conductive portion, the active material coating portion is accommodated in the accommodating cavity, and the conductive portion is connected to the active material coating portion; the pole component is arranged at the mounting hole and connected to the shell component, the pole component comprises a first part and a second part, the first part is connected to the conductive portion, and the second part is used to connect to a busbar component connecting multiple battery cells, the first part and the second part are different parts of the pole component, so that the conductive portion and the busbar component are staggered.

[0005] In the above technical solution, the conductive part and the busbar component are respectively connected to different parts of the pole column component. Thus, when the busbar component is connected to the pole column component, the adverse effects on the connection between the conductive part and the pole column component can be reduced, and the connection between the conductive part and the pole column component will not cause adverse effects on the connection between the busbar component and the pole column component, which is conducive to ensuring the connection quality between the busbar component and the pole column component, as well as the connection quality between the conductive part and the pole column component. Moreover, by connecting the conductive part and the busbar component to different parts of the pole column component respectively, the thickness and material of the first part of the pole column component for connecting with the conductive part only need to meet the requirements for connecting with the conductive part, and the thickness and material of the second part of the pole column component for connecting with the busbar component only need to meet the requirements for connecting with the busbar component. The thicknesses of the first part and the second part do not need to be superimposed, which is conducive to thinning the thickness of the pole column component, thereby facilitating the reduction of the overall weight and cost of the battery cell, and can reduce the space occupied by the pole column component inside or outside the housing. When reducing the space occupied by the pole column component inside the housing component, it is conducive to increasing the injection amount of the electrolyte and the gas production capacity of the battery cell, which is conducive to increasing the volume of the electrode component accommodated in the housing component and improving the energy density of the battery cell. When reducing the space occupied by the pole column component outside the housing component, the volume of the battery cell can be reduced, thereby reducing the volume of the battery device or increasing the energy density of the battery device.

[0006] In some embodiments, the first part and the conductive part are ultrasonically welded to form a first connection part.

[0007] In the above technical solution, by adopting ultrasonic welding to connect the conductive part and the pole column component, ultrasonic welding requires a relatively small thickness of the first part to ensure the effective transmission of welding energy, which is conducive to reducing the thickness of the first part, the weight and cost of the pole column component. In addition, since the first part and the second part are staggered, the thickness of the second part does not need to be set thinner to meet the requirements of ultrasonic welding, which is conducive to the flexible connection between the busbar component and the pole column component. Moreover, the busbar component will not be welded to the pole column component at the position where the ultrasonic welding seat side pit is formed, so that pores can be avoided in the weld mark between the busbar component and the pole column component, and the welding reliability between the busbar component and the pole column component can be improved. In addition, when the pole ear part and the pole column component are connected by ultrasonic welding, multiple layers of pole ear sheets can be welded to the pole column component together by ultrasonic welding at one time. Thus, compared with laser welding, one pre-welding process can be saved, the welding yield can be improved, and the product quality can be enhanced. And it can save equipment and workshops, reducing production costs.

[0008] In some embodiments, the thickness of the pole column component at the first part is less than the thickness at the second part.

[0009] In the above technical solution, the thickness of the first part is relatively thin, which is conducive to ultrasonic welding of the conductive part and the first part. Generally, the step of welding the busbar component can be directly carried out from the outside of the battery cell after the overall assembly of the battery cell. Since the thickness of the second part is relatively thick, laser welding or other methods can be used to directly weld the busbar component and the second part outside the battery cell. The relatively thick second part can easily meet the penetration requirement to improve the connection reliability between the busbar component and the terminal component. In addition, since the thickness of the first part is less than that of the second part, it is equivalent to thinning the terminal component at the first part, thereby saving the material, cost and weight of the terminal component.

[0010] In some embodiments, a groove is formed on the terminal component and recessed in a direction away from the accommodation cavity. The groove opens in the direction of the accommodation cavity. The part of the terminal component on the side of the groove away from the accommodation cavity is the first part, and at least part of the conductive part is received in the groove to be connected to the first part.

[0011] In the above technical solution, by providing a groove on the terminal component to accommodate at least part of the conductive part, the space occupied by the conductive part in the accommodation cavity can be reduced, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell, and is also conducive to accommodating more electrolyte and gas generation, improving the performance of the battery cell. Moreover, by providing a groove on the terminal component, it is equivalent to thinning the position where the first component is provided, thereby saving the material, cost and weight of the terminal component. And it enables the terminal component and the conductive part to be connected by ultrasonic welding, which is conducive to saving the welding process, improving the welding yield, enhancing the product quality, and can save equipment and workshops, reducing the production cost.

[0012] In some embodiments, the terminal component includes a first terminal component. The first terminal component includes a first conductive member and a second conductive member made of different materials. The first conductive member includes a first sub-part and a second sub-part. The first sub-part protrudes in a direction away from the accommodation cavity relative to the second sub-part to form a groove on the side of the first sub-part close to the accommodation cavity, and the first part is constituted by the first sub-part. The second conductive member is provided on the side of the second sub-part away from the accommodation cavity, so that the second part is constituted by the superposition of the second sub-part and the second conductive member.

[0013] In the above technical solution, by setting the first pole component as a composite pole composed of different materials, the first conductive member can be made of the same material as the conductive part, and the second conductive member can be made of the same material as the conduit component, thereby facilitating the connection between the pole component and the conductive part and the conduit component. Moreover, the second conductive member is only provided at the position where the conduit component needs to be connected, which can save the material and cost of the second conductive member. In addition, the second conductive member is provided on the side of the first conductive member away from the accommodating cavity, which is conducive to reducing the difficulty of connecting the first conductive member and the second conductive member and improving the connection reliability of the first conductive member and the second conductive member.

[0014] In some embodiments, the thickness of the second subsection is less than the thickness of the first subsection.

[0015] In the above technical solution, since the second sub-section is used to support and connect the second conductive member, it does not need to be connected to the conductive portion or the busbar portion, so the thickness of the second sub-section can be reduced, thus saving the material, weight and cost of the first conductive member.

[0016] In some embodiments, the pole component includes a second pole component, the second pole component includes a third conductive member with uniform material everywhere, the third conductive member is locally thinned to form a groove, the thinned portion of the third conductive member corresponding to the groove constitutes a first part, and the non-thinned portion of the third conductive member staggered from the groove constitutes a second part.

[0017] In the above technical solution, by setting the second pole part to be made of a uniform material, the structure and processing of the second pole part can be simplified. In addition, by thinning the second pole part to form a groove at the position where it needs to be connected to the conductive part, the material, weight and cost of the second pole part can be saved, and ultrasonic welding with the conductive part can be achieved. The non-thinned part is connected to the busbar part, which is conducive to meeting the penetration depth requirements when welding the busbar part and meeting the welding requirements of the busbar part.

[0018] In some embodiments, the pole component is an elongated structure, the groove is an elongated structure and its length direction extends along the length direction of the pole component, wherein the length of the groove exceeds half of the length of the pole component; and / or the width of the groove exceeds half of the width of the pole component.

[0019] In the above technical solution, the space of the pole component can be fully utilized to form a larger groove, so that the material, weight and cost of the pole component can be reduced to a greater extent, and there is a larger space to accommodate the conductive part, or to accommodate the gas production of the battery cell, or to accommodate the electrolyte, thereby improving the energy density or performance of the battery cell.

[0020] In some embodiments, on a projection plane perpendicular to the central axis of the pole component, an orthographic projection area of the groove is larger than an orthographic projection area of the second portion.

[0021] In the above technical solution, the space of the terminal component can be fully utilized to form a larger groove, so that the materials, weight and cost of the terminal component can be reduced to a greater extent, and there is a larger space to accommodate the conductive part, or the gas generated by the battery cell, or the electrolyte, thereby improving the energy density or performance of the battery cell.

[0022] In some embodiments, the first part is connected to the conductive part to form a first connection part. The terminal component is of a strip-shaped structure, and the first connection part is strip-shaped and the length direction extends along the length direction of the terminal component.

[0023] In the above technical solution, it is beneficial for the first connection part to make full use of the space of the terminal component, beneficial to increasing the connection area between the first part and the conductive part, thereby improving the connection reliability between the first part and the conductive part, as well as improving the conductive efficiency between the terminal component and the electrode component and improving the charging efficiency.

[0024] In some embodiments, the length of the first connection part exceeds half of the length of the terminal component; and / or, the central position in the width direction of the first connection part falls at the central position in the width direction of the terminal component.

[0025] In the above technical solution, when the length of the first connection part exceeds half of the length of the terminal component, the first connection part can make more full use of the space of the terminal component; when the central position in the width direction of the first connection part falls at the central position in the width direction of the terminal component, the first connection part is centered relative to the terminal component, thus facilitating the connection between the conductive part and the terminal component, improving the convenience of operation, and also being beneficial to the cooperation between the conductive part and the terminal component; when the length of the first connection part exceeds half of the length of the terminal component and when the central position in the width direction of the first connection part falls at the central position in the width direction of the terminal component, it is beneficial for the first connection part to make more full use of the space of the terminal component, further improving the connection reliability between the first part and the conductive part, as well as improving the conductive efficiency between the terminal component and the electrode component and improving the charging efficiency.

[0026] In some embodiments, the surface of the first part facing away from the accommodation cavity is flush with the surface of the second part facing away from the accommodation cavity.

[0027] In the above technical solution, the outer surface of the terminal component can be relatively flat, which is beneficial to the support of the outer surface of the terminal component for the welding nozzle during the welding of the terminal component and the bus bar component, or in some cases, the outer surface of the terminal component can also be used to support other components.

[0028] In some embodiments, the electrode component includes a tab connected to the active material coating part, and the tab constitutes the conductive part to be connected to the first part.

[0029] In the above technical solution, the conductive part has a simple structure and is beneficial to improving production efficiency.

[0030] In some embodiments, the tab portion includes a common tab portion that is simultaneously connected to a plurality of active material coating portions. Two ends of the common tab portion are respectively connected to two active material coating portions. A portion of the common tab portion located between the two ends of the common tab portion includes a connection portion, and the connection portion is connected to the first portion.

[0031] In the above technical solution, by connecting two active material coating portions through the common tab portion, after the active material coating portions are wound, there is no problem that the multi-layer tab pieces at the connection portion in the common tab portion are uneven and need to be cut. Thus, materials and processes can be saved, costs can be reduced, and production efficiency can be improved. Moreover, the two active material coating portions are connected to the terminal component through the common tab portion. Compared with each active material coating portion being separately connected to the terminal component through a separate tab portion, the production tempo can be increased. And, compared with each active material coating portion separately outputting a separate tab portion and laying a plurality of separate tab portions flat without overlapping and separately connecting them to the terminal component, the overall space occupied by the tab portion can be saved, which is beneficial to staggering the tab portion from the busbar component, making the areas of both the first connection portion and the second connection portion relatively large.

[0032] In some embodiments, the common tab portion has a pre-connection portion that connects the multi-layer tab pieces in the common tab portion together. A pre-connection portion is provided between each end of the common tab portion and the connection portion.

[0033] In the above technical solution, by respectively providing pre-connection portions between each end of the tab portion and the connection portion, the connection portion is located between the pre-connection portions on both sides, so that the multi-layer tab pieces in the connection portion can tend to gather together, thus facilitating the connection operation between the connection portion and the terminal component.

[0034] In some embodiments, the pre-connection portion is an ultrasonic welding mark.

[0035] In the above technical solution, the pre-connection portion is obtained through ultrasonic welding, which is convenient for operation, has high connection efficiency, and low cost.

[0036] In some embodiments, a support member is provided in the space formed between the active material coating portion and the common tab portion, and the support member is used to support the common tab portion.

[0037] In the above technical solution, problems such as scattering redundancy of the multi-layer connecting pieces in the connection portion can be improved, so that the multi-layer tab pieces in the connection portion can tend to gather together, thus facilitating the connection operation between the connection portion and the terminal component.

[0038] In some embodiments, the support member is a film adhered to the side of the common electrode ear portion facing the active material coating portion.

[0039] In the above technical solution, the support member has a simple structure and is easy to set up, and can reliably support the pole ear portion, and is not prone to causing bumps and damage to the active material coating portion and the pole ear portion.

[0040] In some embodiments, the electrode lug portion includes a separate electrode lug portion connected to only a single active material coating portion, and a plurality of separate electrode lug portions of the same polarity are stacked.

[0041] In the above technical solution, since the separate pole ear parts are superimposed, the space occupied by the pole ear parts as a whole can be saved, which is conducive to the staggering of the pole ear parts and the collecting components, so that the areas of the first connecting part and the second connecting part are relatively large.

[0042] In some embodiments, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive sheet connected to the pole ear portion, and the conductive sheet is connected to the first portion.

[0043] In the above technical solution, the length of the pole ear portion can be shortened, the material of the current collector can be saved, and the processing of the current collector can be facilitated.

[0044] In some embodiments, the pole component includes a pole body, a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the shell component. The insulating structure is insulated and connected between the transition structure and the pole body. The conductive part is connected to the pole body. The pole body includes a first part and a second part.

[0045] In the above technical solution, since the pole component includes a pole body for connecting to the conductive part and a transition structure connected to the shell component, an insulating structure is also provided between the transition structure and the pole body, so that the structural form of the pole component can be flexibly set, and there is no need to affect the connection with the conductive part in order to meet the connection with the shell component, nor is there any need to affect the connection with the shell component in order to meet the connection with the conductive part, which is beneficial to improving the connection quality and connection convenience between the pole component and the shell component, and improving the connection quality and connection convenience between the pole component and the conductive part.

[0046] In some embodiments, the edge of the transition structure is disposed around the mounting hole and overlaps a side of the shell component away from the accommodating cavity. The transition structure is a metal component and is welded to the shell component.

[0047] In the above technical solution, the adapter structure can be matched and connected with the shell component relatively easily, and the connection point is easy to check, thereby improving the reliability of the connection.

[0048] In some embodiments, the insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure close to the pole body, and the sealing structure is clamped between the transition structure and the pole body.

[0049] In the above technical solution, a sealing structure is provided at the connection between the pole body and the transition structure to play a sealing role, so that the pole component itself has self-sealing properties. When the pole component is installed on the shell component, there is no need to consider insulation and sealing issues between the transition structure and the shell component. It is only necessary to complete a reliable connection throughout the entire circle. Therefore, there is no need to apply a large force to the shell component through the pole component, thereby improving the problem of deformation of the shell component under stress, which is beneficial to reducing the thickness of the shell component, reducing material costs, reducing the weight of the battery cell, and improving energy density.

[0050] In some embodiments, the insulating structure includes an injection-molded structural component, and the transition structure and the pole body are integrally injection-molded and connected to the injection-molded structural component.

[0051] In the above technical solution, the injection-molded structural member not only plays an insulating role, but also plays a role in fixing and connecting the pole body and the transition structure, thereby simplifying the processing and molding of the pole component.

[0052] In a second aspect, an embodiment of the present application further provides a battery device, comprising a battery cell of any of the above schemes and a busbar component for connecting multiple battery cells, wherein the first part is connected to the conductive part to form a first connection part, and the busbar component is connected to the second part to form a second connection part.

[0053] In the above technical solution, since the thickness of the pole component can be reduced to reduce the weight and cost of the battery cell, it is beneficial to reduce the weight and cost of the entire battery device.

[0054] In some embodiments, the pole component is an elongated structure, the first connecting portion is an elongated strip and its length direction extends along the length direction of the pole component, the second connecting portion is located at one end of the first connecting portion in the length direction, and the length of the second connecting portion in the length direction of the pole component is less than the length of the first connecting portion.

[0055] In the above technical solution, the first connecting portion can make full use of the space of the pole component, which is conducive to increasing the connection area between the first part and the conductive part, thereby improving the connection reliability between the first part and the conductive part, and improving the conductive efficiency between the pole component and the electrode component, and improving the charging efficiency. Moreover, it can adapt to the relatively small busbar component in the length direction of the pole component, and it is easy to achieve reliable staggering between the busbar component and the conductive part.

[0056] In some embodiments, the terminal post component is in a strip-shaped structure, the first connecting portion is strip-shaped and its length direction extends along the length direction of the terminal post component, and the second connecting portion is annular and arranged around the first connecting portion.

[0057] In the above technical solution, the first connecting portion can make full use of the space of the terminal post component, which is beneficial to increasing the connection area between the first part and the conductive portion, thereby improving the connection reliability between the first part and the conductive portion, as well as improving the conductive efficiency between the terminal post component and the electrode component and the charging efficiency. Moreover, it can adapt to a bus bar component with a relatively large length in the length direction of the terminal post component, and it is easy to achieve reliable staggering between the bus bar component and the conductive portion, and it is easy to increase the area of the second connecting portion to improve the conductive efficiency.

[0058] In some embodiments, the terminal post component is in a strip-shaped structure, the first connecting portion is strip-shaped and its length direction extends along the length direction of the terminal post component, the second connecting portion is strip-shaped and its length direction extends along the length direction of the terminal post component, and the second connecting portion is located on one side in the width direction of the first connecting portion.

[0059] In the above technical solution, the first connecting portion can make full use of the space of the terminal post component, which is beneficial to increasing the connection area between the first part and the conductive portion, thereby improving the connection reliability between the first part and the conductive portion, as well as improving the conductive efficiency between the terminal post component and the electrode component and the charging efficiency. Moreover, it can adapt to a bus bar component with a relatively large length in the length direction of the terminal post component, and it is easy to achieve reliable staggering between the bus bar component and the conductive portion, and it is easy to achieve the cooperation between the bus bar component and the terminal post component, reducing the relative positioning difficulty between the two.

[0060] In some embodiments, the bus bar component and the second part are laser welded to form the second connecting portion.

[0061] In the above technical solution, it is convenient for the connection between the bus bar component and the terminal post component, and it is beneficial to improving the connection reliability between the bus bar component and the terminal post component.

[0062] In some embodiments, on the projection plane perpendicular to the central axis of the terminal post component, the orthographic projection of the first connecting portion and the orthographic projection of the second connecting portion both fall within the orthographic projection range of the mounting hole.

[0063] In the above technical solution, the mounting hole is not likely to affect the cooperation and connection between the conductive portion and the terminal post component, and the connection between the bus bar component and the terminal post component is not likely to have an adverse impact on the housing component.

[0064] In a third aspect, an electric device provided by an embodiment of the present application further includes a battery device according to any of the above solutions.

[0065] In the above technical solution, since the performance of the battery device is improved, it is beneficial to improving the working power consumption performance of the electric device. Brief Description of the Drawings

[0066] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0067] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0068] Figure 2 Exploded view of the structure of a battery device provided by some embodiments of the present application;

[0069] Figure 3 Stereogram of a battery cell provided by some embodiments of the present application;

[0070] Figure 4 Bottom view of a battery cell provided by some embodiments of the present application;

[0071] Figure 5 For the sectional view along Figure 4 line A-A in

[0072] Figure 6 Partial sectional view of a battery cell provided by some embodiments of the present application;

[0073] Figure 7 Partial enlarged view of the terminal component of a battery cell provided by some embodiments of the present application;

[0074] Figure 8 For the sectional view along Figure 7 line B-B in

[0075] Figure 9 Sectional view of the terminal component of a battery cell provided by some embodiments of the present application;

[0076] Figure 10 Distribution schematic diagram of a first connection portion and a second connection portion provided by some embodiments of the present application;

[0077] Figure 11 Distribution schematic diagram of a first connection portion and a second connection portion provided by some other embodiments of the present application;

[0078] Figure 12 Distribution schematic diagram of a first connection portion and a second connection portion provided by still some other embodiments of the present application;

[0079] Figure 13Partial enlarged view of the pole component of the battery cell provided in some other embodiments of the present application;

[0080] Figure 14 Partial enlarged view of the pole component of the battery cell provided in some other embodiments of the present application;

[0081] Figure 16A - Figure 16G Partial enlarged view of the pole component of the battery cell provided in some other embodiments of the present application;

[0082] Figure 16A - Figure 16G Process decomposition diagram of the battery cell provided in an embodiment of the present application.

[0083] Reference numerals:

[0084] Vehicle 1000;

[0085] Battery device 100; Controller 200; Motor 300; Welding head 401; Welding seat 402;

[0086] Box body 101; First box body 1011; Second box body 1012;

[0087] Battery cell 102; First direction X; Second direction Y; Third direction Z;

[0088] Fourth direction F1; Fifth direction F2;

[0089] Housing component 1; Accommodation cavity 11; Mounting hole 12;

[0090] Electrode component 2; Active material coating portion 21; Pole ear portion 22;

[0091] Common pole ear portion 22a; Separate pole ear portion 22b;

[0092] First end 221; Second end 222; Connection portion 223; Pre-connection portion 224;

[0093] Conductive portion 23; Conductive sheet 24;

[0094] Pole component 3; Central axis L;

[0095] First part 31; One side surface S1 of the first part facing away from the accommodation cavity;

[0096] Second part 32; One side surface S2 of the second part facing away from the accommodation cavity; Groove 33;

[0097] First pole component 3A; First conductive member 34; First sub-part 341;

[0098] Second sub-part 342; Second conductive member 35;

[0099] A second pole component 3B; a third conductive member 36;

[0100] Pole body 37; transfer structure 38; insulation structure 39;

[0101] Sealing structural part 391; injection molding structural part 392;

[0102] First connecting portion 4; second connecting portion 5; supporting member 6;

[0103] The conduit component 103. DETAILED DESCRIPTION

[0104] 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.

[0105] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0106] 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.

[0107] 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.

[0108] In this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0109] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0110] The term "a plurality of" as used in this application refers to two or more (including two).

[0111] In the embodiments of this application, the battery cell may be a secondary battery device, which refers to a battery cell that can activate the active material through charging and continue to be used after discharging. The battery cell may be a lithium-ion battery device, a sodium-ion battery device, a sodium-lithium-ion battery device, a lithium-metal battery device, a sodium-metal battery device, a lithium-sulfur battery device, a magnesium-ion battery device, a nickel-metal hydride battery device, a nickel-cadmium battery device, a lead-acid battery device, etc., and the embodiments of this application are not limited thereto. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of this application are also not limited thereto. Generally, the battery cell is divided into three types according to the encapsulation method: cylindrical battery cell, square battery cell, and soft-pack battery cell, and the embodiments of this application are also not limited thereto.

[0112] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a current collecting component. In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells. As an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with a cable tie. In some embodiments, the battery apparatus may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assembly is accommodated in the box body. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0113] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box. As an example, a closed space is formed inside the box to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly. In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can become at least part of the floor of the vehicle, or part of the box can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0114] The battery cell includes a housing component, an electrode component, and an electrolyte. The housing component is used to accommodate the electrode component and the electrolyte. A pole component of the positive electrode and a pole component of the negative electrode are provided on the housing component. At least one electrode component is accommodated in the housing component. The electrode component is composed of a positive electrode plate, a negative electrode plate, and a separator. The electrode component can be a wound structure or a stacked structure, etc. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0115] The positive electrode plate generally can include a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer coated. The positive electrode current collector without the positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0116] The negative electrode plate generally can include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer coated. The negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc.

[0117] In order to ensure that a large current can pass through without fusing, the number of positive electrode tabs is multiple and they are stacked together to form the pole part of the positive electrode, and the number of negative electrode tabs is multiple and they are stacked together to form the pole part of the negative electrode. A pole component is provided on the housing component. The pole part of the positive electrode is electrically connected to the pole component of the positive electrode, and the pole part of the negative electrode is electrically connected to the pole component of the negative electrode.

[0118] During the production process of a battery cell, ultrasonic welding can be used. First, multiple tab pieces in the tab part are pre-welded to form an ultrasonic weld mark, and then laser welding is used to weld the ultrasonic weld mark to the terminal component, realizing the connection and electrical conduction between the electrode component and the terminal component. Then, the busbar component is assembled outside the terminal component, directly above the tab part, and the busbar component is connected to the terminal component by laser welding. However, in order to ensure the penetration depth requirement during the welding of the busbar component and not affect the weld mark between the tab part and the terminal component, the terminal component needs to be set relatively thick, resulting in relatively high costs and weights for the terminal component.

[0119] Therefore, an embodiment of the present application proposes a battery cell. By arranging the conductive part of the electrode component and the busbar component to be connected to different parts of the terminal component respectively, it is beneficial to reduce the thickness of the terminal component, thereby helping to reduce the overall weight and cost of the battery cell. In addition, when reducing the thickness of the terminal component reduces the occupied space inside the housing component by the terminal component, it is beneficial to increase the injection volume of the electrolyte and the gas generation capacity of the battery cell, and is conducive to increasing the volume of the electrode component accommodated in the housing component, improving the energy density of the battery cell. When reducing the thickness of the terminal component reduces the occupied space outside the housing component by the terminal component, the volume of the battery cell can be reduced, thereby reducing the volume of the battery device or increasing the energy density of the battery device.

[0120] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptops, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0121] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application.

[0122] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is arranged inside the vehicle 1000, and the battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0123] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, providing driving power for the vehicle 1000 instead of or partially replacing fuel or natural gas.

[0124] Please refer to Figure 2 , Figure 2 which is an exploded view of the structure of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the box body 101. Among them, the box body 101 is used to provide an assembly space for the battery cells 102, and the box body 101 can adopt various structures. In some embodiments, the box body 101 may include a first box body 1011 and a second box body 1012, the first box body 1011 and the second box body 1012 cover each other, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 may be a hollow structure with one end open, and the first box body 1011 may be a plate-shaped cover structure, and the first box body 1011 covers the open side of the second box body 1012 so that the first box body 1011 and the second box body 1012 jointly define an assembly space; the first box body 1011 and the second box body 1012 may also both be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 can be in various shapes, such as a cylinder, a cuboid, etc.

[0125] In the battery device 100, the plurality of battery cells 102 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 102. The plurality of battery cells 102 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 102 is accommodated in the box body 101; of course, the battery device 100 can also be that a plurality of battery cells 102 are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then a plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 101. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electric welding among the plurality of battery cells 102.

[0126] The battery device 100 further includes a busbar component. There are multiple battery cells 102, and at least two of them are electrically connected through the busbar component. The busbar component is used to connect the multiple battery cells 102. Thus, series connection and / or parallel connection of the multiple battery cells 102 can be achieved. For example, when the multiple battery cells 102 are connected in series, the anode of one battery cell 102 is connected to the cathode of the next battery cell 102 through one busbar component, and at the same time, the cathode of this battery cell 102 is connected to the anode of the previous battery cell 102 through another busbar component. For example, in combination with Figure 6 , the busbar component 103 can be connected to the terminal component 3 to achieve electrical connection between the battery cell 102 and the busbar component 103.

[0127] Referring to Figure 3 the embodiment shown, Figure 3 is a perspective view of the battery cell 102 provided in some embodiments of the present application. The length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0128] Please refer to Figure 4 - Figure 6 , Figure 4 which is Figure 3 a bottom view of the battery cell 102 shown in Figure 5 and Figure 4 is a cross-sectional view along the line A-A in Figure 6 is a partial cross-sectional view of the battery cell 102 provided in some embodiments of the present application. In some embodiments of the present application, the battery cell 102 includes: a housing component 1, an electrode component 2, and a terminal component 3. Among them, the material of the housing component 1 is not limited. For example, an aluminum shell, a steel shell, an aluminum plastic film, plastic, or other materials resistant to electrolyte corrosion can be used.

[0129] The housing component 1 defines an accommodation cavity 11, and the housing component 1 has a mounting hole 12. The terminal component 3 is disposed at the mounting hole 12 and the terminal component 3 is connected to the housing component 1. The electrode component 2 includes an active material coating portion 21 and a conductive portion 23. The active material coating portion 21 is accommodated in the accommodation cavity 11. The conductive portion 23 is connected to the active material coating portion 21 and is connected to the terminal component 3, so that the conductive portion 23 is electrically connected between the active material coating portion 21 and the terminal component 3.

[0130] By disposing the terminal component 3 at the mounting hole 12 on the housing component 1, the terminal component 3 can be unobstructed by the housing component 1. On the one hand, it can form a connection with the electrode component 2 inside the housing component 1, and on the other hand, it can form a connection with the busbar component 103 outside the housing component 1. Among them, the electrode component 2 includes a pole piece, and the pole piece includes a current collector and an active material layer. The portion of the current collector coated with the active material layer is used to form the active material coating portion 21, and the portion of the current collector not coated with the active material layer is used to form the pole ear portion 22. The pole ear portion 22 protrudes from the active material coating portion 21 toward the direction close to the terminal component 3. The conductive portion 23 includes the pole ear portion 22. For example, the conductive portion 23 can be composed only of the pole ear portion 22. One end of the pole ear portion 22 is connected to the active material coating portion 21, and the other end of the pole ear portion 22 is connected to the terminal component 3. At this time, the pole ear portion 22 is electrically connected between the active material coating portion 21 and the terminal component 3. Another example, in combination with Figure 13 , the conductive portion 23 can include the pole ear portion 22 and the conductive sheet 24. One end of the pole ear portion 22 is connected to the active material coating portion 21, the other end of the pole ear portion 22 is connected to one end of the conductive sheet 24, and the other end of the conductive sheet 24 is connected to the terminal component 3. Thus, the pole ear portion 22 and the conductive sheet 24 can be electrically connected between the active material coating portion 21 and the terminal component 3.

[0131] Please refer to again Figure 6 , and in combination with Figure 7 and Figure 8 , Figure 7 is a partial enlarged view of the terminal component 3 of the battery cell 102 provided in some embodiments of the present application; Figure 8 is a cross-sectional view taken along the B-B line in Figure 7 . The terminal component 3 includes a first portion 31 and a second portion 32. The first portion 31 is used to connect with the conductive portion 23 to form a first connection portion 4, and the second portion 32 is used to connect with the busbar component 103 to form a second connection portion 5. It should be noted that the shape, size, material and other characteristics of the first portion 31 need to meet the connection requirements of the conductive portion 23 to be called the first portion 31, and the shape, size, material and other characteristics of the second portion 32 need to meet the connection requirements of the busbar component 103 to be called the second portion 32.

[0132] For example, when the first portion 31 is connected to the conductive portion 23 by welding, the weld mark formed by welding the first portion 31 and the conductive portion 23 is the first connection portion 4. When the second portion 32 is connected to the busbar component 103 by welding, the weld mark formed by welding the second portion 32 and the busbar component 103 is the second connection portion 5. Among them, the welding method is not limited. For example, it can be ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, laser welding, resistance welding, pressure fusion welding, brazing, etc.

[0133] In the embodiments of the present application, in combination withFigure 6 and Figure 7 , the first part 31 and the second part 32 are different parts of the terminal post component 3, so that the conductive part 23 and the busbar component 103 are arranged staggeredly. That is, on the projection plane perpendicular to the central axis L of the terminal post component 3 (for example Figure 7 as shown), the orthographic projection of the first part 31 on this projection plane does not overlap with the orthographic projection of the second part 32 on this projection plane. In this way, the conductive part 23 and the busbar component 103 are not opposite to each other along the extension direction of the central axis L of the terminal post component 3, but are staggered along the direction perpendicular to the central axis L of the terminal post component 3.

[0134] In the above technical solution, the conductive part 23 and the busbar component 103 are respectively connected to different parts of the terminal post component 3. Thus, when the busbar component 103 is connected to the terminal post component 3, the adverse effects on the connection between the conductive part 23 and the terminal post component 3 can be reduced, and the connection between the conductive part 23 and the terminal post component 3 will not cause adverse effects on the connection between the busbar component 103 and the terminal post component 3, which is conducive to ensuring the connection quality between the busbar component 103 and the terminal post component 3, as well as the connection quality between the conductive part 23 and the terminal post component 3.

[0135] In addition, if the same part of the terminal post component is used to connect the busbar component and the conductive part respectively, the busbar component and the conductive part will be opposite to each other along the central axis L of the terminal post component. At this time, the thickness of this part of the terminal post component needs to be increased to avoid the influence of welding through. At this time, the overall weight and cost of the battery cell will be affected. Moreover, considering that the material of this part needs to meet the welding requirements of both the conductive part and the busbar component, when the materials of the conductive part and the busbar component are different (for example, the conductive part is copper and the busbar component is aluminum), this part of the terminal post component needs to be laminated with two materials (for example, this part needs to be in the form of a lamination of a copper layer and an aluminum layer, the copper layer is connected to the conductive part, and the aluminum layer is connected to the busbar component), and the thicknesses of both materials need to meet their respective welding requirements, making the overall thickness of this part thicker, occupying more space inside and / or outside the housing component. When more space is occupied inside the housing component, it affects the injection amount of the electrolyte and the gas production capacity of the battery cell, or affects the volume of the electrode component that can be accommodated, affecting the energy density of the battery cell. And when more space is occupied outside the housing component, the volume of the battery cell becomes larger, affecting the volume or energy density of the battery device.

[0136] In the embodiments of the present application, by connecting the conductive part 23 and the busbar component 103 to different parts of the pole column component 3 respectively, the thickness and material of the first part 31 of the pole column component 3 for connecting with the conductive part 23 only need to meet the requirement of connecting with the conductive part 23, and the thickness and material of the second part 32 of the pole column component 3 for connecting with the busbar component 103 only need to meet the requirement of connecting with the busbar component 103. The thicknesses of the first part 31 and the second part 32 do not need to be superimposed, which is beneficial to thinning the thickness of the pole column component 3, thereby facilitating reducing the overall weight and cost of the battery cell 102, and can reduce the space occupied by the pole column component 3 inside or outside the housing component 1. When reducing the space occupied by the pole column component 3 inside the housing component 1, it is beneficial to increase the injection amount of the electrolyte and the gas production capacity of the battery cell 102, beneficial to increasing the volume of the electrode component 2 accommodated in the housing component 1, and enhancing the energy density of the battery cell 102. When reducing the space occupied by the pole column component 3 outside the housing component 1, the volume of the battery cell 102 can be reduced, thereby reducing the volume of the battery device 100 or increasing the energy density of the battery device 100.

[0137] In some embodiments of the present application, the conductive part 23 and the first part 31 are formed into a first connection part 4 by ultrasonic welding, so the first connection part 4 is formed as an ultrasonic welding mark. Wherein ultrasonic welding refers to ultrasonic wave welding.

[0138] In the above technical solution, by adopting ultrasonic welding to connect the conductive part 23 and the pole column component 3, ultrasonic welding requires a relatively small thickness of the first part 31 to ensure the effective transmission of welding energy, thereby facilitating reducing the thickness of the first part 31 and reducing the weight and cost of the pole column component 3. Of course, the welding method of the conductive part 23 and the pole column component 3 is not limited to this. For example, it can also be resistance welding, pressure fusion welding, brazing, adhesive bonding, etc.

[0139] In addition, since ultrasonic welding requires a welding base and a welding head, the welding base can be arranged on the side of the first part 31 away from the conductive part 23, and the welding head can be arranged on the side of the conductive part 23 away from the first part 31. During ultrasonic welding, the welding base will cause many pits to be formed on the surface of the side of the first part 31 away from the conductive part 23. If the busbar component 103 is welded at the position where the pits are formed on the pole column component 3, air holes will be formed in the welding mark between the busbar component 103 and the pole column component 3 due to the existence of the above pits, affecting the welding reliability between the busbar component 103 and the pole column component 3. In the embodiments of the present application, since the first part 31 and the second part 32 are staggered, the busbar component 103 will not be welded to the pole column component 3 at the position where the above pits are formed, thereby avoiding the formation of air holes in the welding mark between the busbar component 103 and the pole column component 3 and improving the welding reliability between the busbar component 103 and the pole column component 3.

[0140] In addition, when the conductive part 23 is composed only of the tab part 22, since the tab part 22 is formed by laminating multiple tab sheets, when connecting the tab part 22 and the terminal component 3 by laser welding, in order to avoid the gap between the multiple tab sheets from affecting the welding reliability between the tab part 22 and the terminal component 3, it is necessary to pre-weld the multiple tab sheets to form a solid sheet shape first, and then laser-weld the solid sheet to the terminal component 3. In this way, two welding processes are required, not only the required process time is longer, the production efficiency is lower, but also more equipment and workshops are needed, resulting in increased production costs. Moreover, the two welding processes are more likely to cause a decrease in the welding yield, affecting the connection reliability between the conductive part 23 and the terminal component 3 and the product quality. In the embodiments of the present application, when the tab part 22 and the terminal component 3 are connected by ultrasonic welding, the multiple tab sheets and the terminal component 3 can be welded together at one time by ultrasonic welding. Therefore, compared with laser welding, one welding process can be saved, the welding yield can be improved, and the product quality can be enhanced. And equipment and workshops can be saved, and the production cost can be reduced.

[0141] In some embodiments of the present application, please refer again to Figure 6 - Figure 8 , the thickness t1 of the terminal component 3 at the first part 31 is less than the thickness t2 at the second part 32.

[0142] In the above technical solution, the thickness of the first part 31 is relatively thin, which is beneficial to the ultrasonic welding between the conductive part 23 and the first part 31. Generally, the step of welding the bus bar component 103 can be directly carried out from the outside of the battery cell 102 after the overall assembly of the battery cell 102. Since the thickness of the second part 32 is relatively thick, laser welding or other methods can be used to directly weld the bus bar component 103 and the second part 32 outside the battery cell 102. The relatively thick second part 32 can easily meet the penetration requirement to improve the connection reliability between the bus bar component 103 and the terminal component 3. In addition, since the thickness of the first part 31 is less than the thickness of the second part 32, it is equivalent to thinning the terminal component 3 at the first part 31, thereby saving the material, cost and weight of the terminal component 3 and being beneficial to improving the energy density of the battery device 100. Of course, the welding method between the bus bar component 103 and the terminal component 3 is not limited to this. For example, it can also be pressure fusion welding, brazing, adhesive bonding, etc.

[0143] In some embodiments of the present application, please refer again to Figure 6 - Figure 8 , a groove 33 is formed on the terminal component 3 and recesses in a direction away from the accommodation cavity 11. The groove 33 opens in the direction towards the accommodation cavity 11. The part of the terminal component 3 on the side of the groove 33 away from the accommodation cavity 11 is the first part 31, and at least part of the conductive part 23 is received in the groove 33 to be connected to the first part 31.

[0144] For a clearer introduction, in combination with Figure 6 the orientation description shown, the pole component 3 is located above the accommodation cavity 11. The groove 33 is recessed upward and opens downward. The part of the pole component 3 located above the groove 33 is the first part 31. Of course, the present application is not limited to this. In actual use, the battery cell 102 can be inverted or placed flat so that the pole component 3 is located below or on the side of the accommodation cavity 11.

[0145] In the above technical solution, by providing the groove 33 on the pole component 3 to accommodate at least part of the conductive part 23, the space occupied by the conductive part 23 in the accommodation cavity 11 can be reduced, which is beneficial to increasing the volume of the active material coating part 21, thereby increasing the energy density of the battery cell 102, and is also beneficial to accommodating more electrolyte and generated gas, improving the performance of the battery cell 102. Moreover, by providing the groove 33 on the pole component 3, it is equivalent to thinning the position where the first part 31 is provided, thereby saving the material, cost and weight of the pole component 3. And it enables the pole component 3 and the conductive part 23 to be connected by ultrasonic welding, which is beneficial to saving the welding process, improving the welding yield, enhancing the product quality, and saving equipment and workshops, reducing the production cost.

[0146] In some embodiments of the present application, please refer to Figure 6 and Figure 8 again. The pole component 3 includes a first pole component 3A. The first pole component 3A includes a first conductive member 34 and a second conductive member 35 with different materials. The first conductive member 34 includes a first sub - part 341 and a second sub - part 342. The first sub - part 341 protrudes away from the accommodation cavity 11 relative to the second sub - part 342, so as to form a groove 33 on the side of the first sub - part 341 close to the accommodation cavity 11, and the first part 31 is constituted by the first sub - part 341. The second conductive member 35 is arranged on the side of the second sub - part 342 away from the accommodation cavity 11, so that the second part 32 is constituted by the superposition of the second sub - part 342 and the second conductive member 35.

[0147] For a clearer introduction, in combination with Figure 6 and Figure 8 the orientation description shown, the pole component 3 is located above the accommodation cavity 11. The first sub - part 341 protrudes upward relative to the second sub - part 342. A groove 33 is formed below the first sub - part 341, and the second conductive member 35 is arranged above the second sub - part 342. Of course, the present application is not limited to this. In actual use, the battery cell 102 can be inverted or placed flat so that the pole component 3 is located below or on the side of the accommodation cavity 11.

[0148] Exemplarily, the first pole component 3A can be used as a negative pole component 3 connected to the negative conductive part 23, the negative conductive part 23 is made of copper, and the bus component 103 is made of aluminum. At this time, the first conductive component 34 can be made of the same copper material as the conductive part 23, and the second conductive component 35 can be made of the same aluminum material as the bus component 103, thereby facilitating the connection between the pole component 3 and the conductive part 23 and the bus component 103.

[0149] Thus, by setting the first pole component 3A as a composite pole composed of different materials, the connection between the pole component 3 and the conductive part 23 and the busbar component 103 is facilitated. Moreover, the second conductive member 35 is only provided at the position where the busbar component 103 needs to be connected, which can save the material, weight and cost of the second conductive member 35. In addition, the second conductive member 35 is provided on the side of the first conductive member 34 away from the accommodating cavity 11, which is conducive to reducing the difficulty of connecting the first conductive member 34 and the second conductive member 35, and improving the connection reliability of the first conductive member 34 and the second conductive member 35.

[0150] Please refer again Figure 8 In some embodiments of the present application, the thickness of the second sub-portion 342 may be less than the thickness of the first sub-portion 341. Since the second sub-portion 342 is used to support and connect the second conductive member 35, it does not need to be connected to the conductive portion 23 or the busbar component 103, so the thickness of the second sub-portion 342 can be reduced, which can save the material, weight and cost of the first conductive member 34.

[0151] Please refer to Figure 9 , Figure 9 A partial cross-sectional view of the pole component 3 of the battery cell 102 provided in other embodiments of the present application. In some embodiments of the present application, the pole component 3 includes a second pole component 3B, and the second pole component 3B includes a third conductive member 36 of uniform material at all locations, and the third conductive member 36 is partially thinned to form a groove 33, and the thinned portion of the third conductive member 36 corresponding to the groove 33 constitutes the first portion 31, and the non-thinned portion of the third conductive member 36 staggered from the groove 33 constitutes the second portion 32. Among them, "the third conductive member 36 is of uniform material at all locations" means that the materials of the third conductive member 36 at all locations are consistent and there is no difference.

[0152] Exemplarily, the second pole component 3B can be used as the positive pole component 3 to connect with the positive conductive part 23. The positive conductive part 23 is made of aluminum, and the busbar component 103 is also made of aluminum. At this time, aluminum material can be used to make the third conductive part 36. In this way, it is beneficial to connect the pole component 3 with the conductive part 23 and to connect the pole component 3 with the busbar component 103.

[0153] Thus, by setting the second pole column component 3B in a form with uniform material, the structure and processing of the second pole column part can be simplified. In addition, a groove 33 is formed by thinning at the position where it needs to be connected to the conductive part 23, which can save the material, weight, and cost of the second pole column component 3B, and is conducive to realizing ultrasonic welding with the conductive part 23. And it is connected to the bus bar component 103 at the non-thinned part, which is beneficial to meeting the penetration depth requirement when welding the bus bar component 103 and meeting the welding requirement of the bus bar component 103.

[0154] Please refer to again Figure 7 and Figure 8 , in some embodiments of the present application, the pole column component 3 has a long strip structure, the groove 33 is long strip-shaped and extends in the length direction of the pole column component 3 (such as the fourth direction F1 shown in the figure), and the length L1 of the groove 33 exceeds half of the length L2 of the pole column component 3. Thus, the space of the pole column component 3 can be fully utilized to form a larger groove 33, so that the material, weight, and cost of the pole column component 3 can be reduced to a greater extent, and there is a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0155] Please refer to again Figure 7 and Figure 8 , in some embodiments of the present application, the pole column component 3 has a long strip structure, the groove 33 is long strip-shaped and extends in the length direction of the pole column component 3 (such as the fourth direction F1 shown in the figure), and the length L1 of the groove 33 exceeds half of the length L2 of the pole column component 3. Thus, the space of the pole column component 3 can be fully utilized to form a larger groove 33, so that the material, weight, and cost of the pole column component 3 can be reduced to a greater extent, and there is a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0156] Please refer to again Figure 7 and Figure 8 , in some embodiments of the present application, the pole column component 3 has a long strip structure, the groove 33 is long strip-shaped and extends in the length direction of the pole column component 3 (such as the fourth direction F1 shown in the figure), and the width W1 of the groove 33 exceeds half of the width W2 of the pole column component 3. Thus, the space of the pole column component 3 can be fully utilized to form a larger groove 33, so that the material, weight, and cost of the pole column component 3 can be reduced to a greater extent, and there is a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0157] Exemplarily, the longitudinal center line of the groove 33 (i.e., the center line extending along the length direction of the groove 33 and located at the width center position of the groove 33) is centered relative to the pole piece 3. Thus, the space of the pole piece 3 can be utilized more fully to increase the width of the groove 33, thereby reducing the material, weight, and cost of the pole piece 3 to a greater extent, and having a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0158] Please refer again to Figure 7 and Figure 8 , in some embodiments of the present application, the pole piece 3 has a strip-shaped structure, the groove 33 is strip-shaped and extends along the length direction of the pole piece 3 (such as the fourth direction F1 shown in the figure), the length L1 of the groove 33 exceeds half of the length L2 of the pole piece 3, and the width W1 of the groove 33 exceeds half of the width W2 of the pole piece 3. Thus, the space of the pole piece 3 can be utilized fully to form a larger groove 33, thereby reducing the material, weight, and cost of the pole piece 3 to a greater extent, and having a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0159] In some embodiments of the present application, the contour shape of the groove 33 matches the contour shape of the pole piece 3. That is, on the projection plane perpendicular to the central axis L of the pole piece 3, the contour shape of the front projection of the pole piece 3 is exactly the same or substantially the same as the contour shape of the front projection of the groove 33. For example, both are rectangular, or both are oval, or both are runway-shaped, etc. Thus, the space of the pole piece 3 can be utilized fully to form a larger groove 33, thereby reducing the material, weight, and cost of the pole piece 3 to a greater extent, and having a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0160] Please refer again to Figure 7 and Figure 8 , in some embodiments of the present application, on the projection plane perpendicular to the central axis L of the pole piece 3, the front projection area of the groove 33 is larger than the front projection area of the second part 32. Thus, the space of the pole piece 3 can be utilized fully to form a larger groove 33, thereby reducing the material, weight, and cost of the pole piece 3 to a greater extent, and having a larger space to accommodate the conductive part 23, or the gas generated by the battery cell 102, or the electrolyte, thereby improving the energy density or performance of the battery cell 102.

[0161] Please refer to again Figure 8 and Figure 9 In some embodiments of the present application, the side surface S1 of the first part 31 facing away from the accommodation cavity 11 is flush with the side surface S2 of the second part 32 facing away from the accommodation cavity 11. Thus, the outer surface of the pole column component 3 can be relatively flat, which is beneficial to the support of the outer surface of the pole column component 3 for the welding nozzle during the welding of the pole column component 3 and the bus bar component 103, or in some cases, the outer surface of the pole column component 3 can also be used to support other components. For example, in Figure 8 the example shown, the outer surface of the first sub-part 341 of the first conductive member 34 is flush with the outer surface of the second conductive member 35, and for another example, in Figure 9 the example shown, the outer surface of the thinned part of the third conductive member 36 is flush with the outer surface of the non-thinned part.

[0162] In some embodiments of the present application, the first part 31 is connected to the conductive part 23 to form a first connection part 4. Please refer to Figure 10 The pole column component 3 has a long strip structure, and the first connection part 4 is long strip-shaped and extends in the length direction of the pole column component 3 (for example, the fourth direction F1 shown in the figure). Thus, it is beneficial for the first connection part 4 to make full use of the space of the pole column component 3, beneficial to increasing the connection area between the first part 31 and the conductive part 23, thereby improving the connection reliability between the first part 31 and the conductive part 23, as well as improving the conductive efficiency of the pole column component 3 and the electrode component 2 and improving the charging efficiency.

[0163] In some embodiments of the present application, please refer to Figure 10 The length L3 of the first connection part 4 exceeds half of the length L2 of the pole column component 3. Thus, the first connection part 4 can make full use of the space of the pole column component 3, beneficial to increasing the connection area between the first part 31 and the conductive part 23, thereby improving the connection reliability between the first part 31 and the conductive part 23, as well as improving the conductive efficiency of the pole column component 3 and the electrode component 2 and improving the charging efficiency. For example, the weld mark formed by welding the first part 31 and the conductive part 23 is the first connection part 4, and this weld mark is a long strip extending in the length direction of the pole column component 3 (for example, the fourth direction F1 shown in the figure), and the length of this weld mark exceeds half of the length of the pole column component 3.

[0164] In some embodiments of the present application, please refer to Figure 10 The central position in the width direction of the first connection part 4 falls at the central position in the width direction of the pole column component 3 (for example, the fifth direction F2 shown in the figure). Thus, the first connection part 4 is arranged centrally relative to the pole column component 3, thereby facilitating the connection between the conductive part 23 and the pole column component 3, improving the convenience of operation, and facilitating the cooperation between the conductive part 23 and the pole column component 3.

[0165] In some embodiments of the present application, please refer to Figure 10 , the length L3 of the first connecting portion 4 exceeds half of the length L2 of the pole component 3, and the central position in the width direction of the first connecting portion 4 falls at the central position in the width direction of the pole component 3 (such as the fifth direction F2 shown in the figure). Thus, the first connecting portion 4 can make more full use of the space of the pole component 3, which is beneficial to increasing the connection area between the first portion 31 and the conductive portion 23, thereby improving the connection reliability between the first portion 31 and the conductive portion 23, as well as improving the conduction efficiency between the pole component 3 and the electrode component 2 and the charging efficiency.

[0166] In the embodiments of the present application, when the first portion 31 is connected to the conductive portion 23 to form the first connecting portion 4, the pole is a long strip structure, the first connecting portion 4 is long strip-shaped and extends along the length direction of the pole component 3, and when the length L3 of the first connecting portion 4 exceeds half of the length L2 of the pole component 3, the setting position of the second portion 32 can have various situations. For example, the second portion 32 can be arranged at one end in the length direction of the first connecting portion 4, or for another example, the second portion 32 can be arranged on one side in the width direction of the first connecting portion 4, etc., so that the second portion 32 can be flexibly arranged to adapt to busbar components 103 of different forms. For example, some specific embodiments will be given below.

[0167] In some embodiments, in combination with Figure 10 , the first portion 31 is connected to the conductive portion 23 to form the first connecting portion 4, the second portion 32 is connected to the busbar component 103 to form the second connecting portion 5, and the first connecting portion 4 is long strip-shaped and extends along the length direction of the pole component 3; the second connecting portion 5 is located at one end in the length direction of the first connecting portion 4, and the length L4 of the second connecting portion 5 in the length direction of the pole component 3 is less than the length L3 of the first connecting portion 4. Thus, it is possible to adapt to the busbar component 103 with a relatively small length in the length direction of the pole component 3, and it is easy to reliably stagger the busbar component 103 and the conductive portion 23.

[0168] In some embodiments, in combination with Figure 11 , the first portion 31 is connected to the conductive portion 23 to form the first connecting portion 4, the second portion 32 is connected to the busbar component 103 to form the second connecting portion 5, and the first connecting portion 4 is long strip-shaped and extends along the length direction of the pole component 3; the second connecting portion 5 is annular and is arranged to surround the first connecting portion 4. Thus, it is possible to adapt to the busbar component 103 with a relatively large length in the length direction of the pole component 3, and it is easy to reliably stagger the busbar component 103 and the conductive portion 23, and it is easy to increase the area of the second connecting portion 5 and improve the conduction efficiency.

[0169] In some embodiments, in combination with Figure 12, the first part 31 is connected to the conductive part 23 to form the first connection part 4, and the second part 32 is connected to the bus bar component 103 to form the second connection part 5. The first connection part 4 is strip-shaped and its length direction extends along the length direction of the pole column component 3; the second connection part 5 is strip-shaped and its length direction extends along the length direction of the pole column component 3. The second connection part 5 is located on one side in the width direction of the first connection part 4, that is, along the width direction of the pole column component 3, the second connection part 5 is located on one side of the first connection part 4. Thus, it is possible to accommodate the bus bar component 103 with a relatively large length in the length direction of the pole column component 3, and it is easy to reliably stagger the bus bar component 103 and the conductive part 23, and it is easy to realize the cooperation between the bus bar component 103 and the pole column component 3, reducing the relative positioning difficulty between the two.

[0170] In some embodiments of the present application, please refer to Figure 13 , the electrode component 2 includes a pole ear part 22 connected to the active material coating part 21. The conductive part 23 includes the pole ear part 22 and a conductive sheet 24 connected to the pole ear part 22, and the conductive sheet 24 is connected to the first part 31. Thus, by arranging that the pole ear part 22 is indirectly connected to the pole column component 3 through the conductive sheet 24, the length of the pole ear part 22 can be shortened, the material of the current collector can be saved, and the processing of the current collector is facilitated.

[0171] In some embodiments of the present application, please refer to Figure 14 , the electrode component 2 includes a pole ear part 22 connected to the active material coating part 21, and the pole ear part 22 constitutes the conductive part 23 to be connected to the first part 31. Thus, the structure of the conductive part 23 is simple. Compared with the solution in which the conductive part 23 is formed by connecting the conductive part 23 and the conductive sheet 24, the operation of connecting the conductive part 23 and the conductive sheet 24 can be omitted, improving the production efficiency.

[0172] In some embodiments of the present application, please refer to Figure 14 , the pole ear part 22 includes a common pole ear part 22a connected to a plurality of active material coating parts 21 at the same time. Both ends of the common pole ear part 22a are respectively connected to two active material coating parts 21. A part of the common pole ear part 22a located between both ends of the common pole ear part 22a includes a connection part 223, and the connection part 223 is connected to the first part 31. As Figure 14 shown, both ends of the common pole ear part 22a are respectively a first end 221 and a second end 222. The common pole ear part 22a extends from the first end 221 to the second end 222, and there is no disconnected position during the extension process, that is, each layer of pole ear sheet in the common pole ear part 22a is a complete sheet body extending from the first end 221 to the second end 222 before welding.

[0173] Thus, the two active material coating parts 21 are connected through the common pole ear part 22a. After the active material coating part 21 is wound, the multi-layer pole ear sheets of the connection part 223 in the common pole ear part 22a do not have the problem of uneven cutting, so that materials and processes can be saved, costs can be reduced, and production efficiency can be improved. Moreover, the two active material coating parts 21 are connected to the pole part 3 through the common pole ear part 22a, which can improve the production cycle compared to each active material coating part 21 being connected to the pole part 3 through a separate pole ear part 22. Moreover, compared to each active material coating part 21 outputting a separate pole ear part 22b separately, the separate pole ear part 22b is laid flat without stacking and connected to the pole part 3 separately, which can save the space occupied by the pole ear part 22 as a whole, which is conducive to the staggered pole ear part 22 and the confluence part 103, so that the area of the first connection part 4 and the second connection part 5 are relatively large.

[0174] In some embodiments of this application, please refer to Figure 14 The common pole ear portion 22a has a pre-connection portion 224 for connecting the multiple pole ear sheets in the common pole ear portion 22a together, and a pre-connection portion 224 is provided between each of the two ends of the common pole ear portion 22a and the connection portion 223. Figure 14 As shown, there is at least one pre-connection portion 224 between the first end 221 and the connection portion 223, and there is at least one pre-connection portion 224 between the second end 222 and the connection portion 223. Thus, by respectively providing a pre-connection portion 224 between each of the two ends of the common pole ear portion 22a and the connection portion 223, the connection portion 223 is located between the pre-connection portions 224 on both sides, so that the multi-layer pole ear sheets in the connection portion 223 can tend to gather together, thereby facilitating the connection operation between the connection portion 223 and the pole component 3.

[0175] Exemplarily, the pre-connection portion 224 is a pre-weld weld mark, that is, the multi-layer tabs in the common pole ear portion 22a are partially welded into one piece by welding to form the pre-connection portion 224. Thus, the formation of the pre-connection portion 224 is facilitated, wherein the welding method is not limited, for example, it can be ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, brazing, etc. For example, the pre-connection portion 224 is an ultrasonic weld mark, that is, the multi-layer tabs in the common pole ear portion 22a can be partially welded into one piece by ultrasonic welding to form the pre-connection portion 224, thereby facilitating operation, high connection efficiency, and low cost.

[0176] In some embodiments of this application, please refer to Figure 14 A support member 6 is provided in the space formed between the active material coating portion 21 and the common pole ear portion 22a, and the support member 6 is used to support the common pole ear portion 22a. Thus, the problem of the scattered redundancy of the multi-layered tabs in the connection portion 223 can be improved.

[0177] Exemplarily, the support member 6 is an adhesive film pasted on the side of the common pole tab 22a facing the active material coating portion 21. Thus, the structure of the support member 6 is simple and easy to arrange, and the support for the common pole tab 22a is reliable, and it is not easy to cause bump damage to both the active material coating portion 21 and the common pole tab 22a. For example, the support member 6 can be a blue film and is pasted on the surface of the common pole tab 22a facing the active material coating portion 21, so as to play a role in supporting the common pole tab 22a, and to improve problems such as the scattering redundancy of the multi-layer tabs in the connection portion 223.

[0178] In some embodiments of the present application, while "a support member 6 is provided in the space formed between the active material coating portion 21 and the common pole tab 22a, and the support member 6 is used to support the common pole tab 22a", "the common pole tab 22a has a pre-connection portion 224 that connects the multi-layer pole tabs in the common pole tab 22a together, and a pre-connection portion 224 is provided between each end of the two ends of the common pole tab 22a and the connection portion 223". Thus, problems such as the scattering redundancy of the multi-layer tabs in the connection portion 223 can be improved.

[0179] In some embodiments of the present application, in combination with Figure 15 , the pole tab 22 includes a separate pole tab 22b that is only connected to a single active material coating portion 21, and a plurality of separate pole tabs 22b of the same polarity are stacked. Exemplarily, after a plurality of separate pole tabs 22b are stacked and welded into one body, the welded-together plurality of separate pole tabs 22b can be welded to the pole column component 3; or, one separate pole tab 22b can be welded to the pole column component 3 first, and then the remaining separate pole tabs 22b can be stacked and welded to the separate pole tab 22b into one body. In this way, since the separate pole tabs 22b are stacked, the overall space occupied by the pole tab 22 can be saved, which is beneficial to staggering the pole tab 22 from the bus bar component 103, making the areas of both the first connection portion 4 and the second connection portion 5 relatively large.

[0180] For example, in some examples, when the number of pole pieces included in each active material coating portion 21 is relatively small, the number of pole piece layers included in the pole ear portion 22 is small (for example, 20 to 60 layers). At this time, a common pole ear portion 22a can be provided to connect with the two active material coating portions 21, and then the common pole ear portion 22a can be connected to the pole column component 3. Alternatively, a common pole ear portion 22a may not be provided to be connected to the two active material coating portions 21, but each active material coating portion 21 may output a separate pole ear portion 22b respectively. In this case, the separate pole ear portions 22b of the same polarity output by the two active material coating portions 21 may be stacked together and then welded to the pole column component 3 together. Since the thickness of the pole ear portion 22 after stacking is not too thick, it can be relatively easy to weld to the pole column component 3, and the welding quality is easy to control. In addition, since the separate pole ear portions 22b are stacked, the space occupied by the pole ear portion 22 as a whole can be saved, which is conducive to staggering the pole ear portion 22 and the conduit component 103, so that the areas of the first connection portion 4 and the second connection portion 5 are relatively large.

[0181] For another example, in some other examples, when the number of pole pieces included in each active material coating portion 21 is relatively large, the number of layers of pole pieces included in the pole ear portion 22 is relatively large (for example, 60 layers-120 layers). If each active material coating portion 21 outputs a separate pole ear portion 22b respectively, if multiple separate pole ear portions 22b are not stacked and laid flat and are respectively connected to the pole column component 3, then the area of the pole column component 3 needs to be relatively larger. In order to reduce the space occupied by the pole ear portion 22, the separate pole ear portions 22b of the same polarity outputted separately by the two active material coating portions 21 can be stacked together first, and then welded to the pole column component 3. At this time, the thickness of the two separate pole ear portions 22b after stacking is relatively thick, and it is relatively difficult to weld them to the pole column component 3, and the welding quality is relatively difficult to control. Therefore, a common pole ear portion 22a can be arranged to be connected to the two active material coating portions 21. In this way, the thickness of the common pole ear portion 22a is not the superimposed thickness, but is equivalent to the thickness of the separate pole ear portion 22b output by the single active material coating portion 21. At this time, the pole ear portion 22 can be easily welded to the pole component 3, the welding quality is easy to control, the welding quality is easy to improve, and the production cycle can be improved.

[0182] In some embodiments of the present application, Figure 14 The pole component 3 includes a pole body 37, a transition structure 38 and an insulating structure 39. The transition structure 38 surrounds the pole body 37 and is connected to the shell component 1. The insulating structure 39 is insulated and connected between the transition structure 38 and the pole body 37. The conductive part 23 is connected to the pole body 37. The pole body 37 includes a first part 31 and a second part 32.

[0183] Thus, since the terminal post component 3 includes a terminal post body 37 for connecting to the conductive part 23 and an adapter structure 38 for connecting to the housing component 1, and an insulating structure 39 is further provided between the adapter structure 38 and the terminal post body 37, the structural form of the terminal post component 3 can be flexibly set, without affecting the connection to the conductive part 23 in order to meet the connection to the housing component 1, nor affecting the connection to the housing component 1 in order to meet the connection to the conductive part 23, thereby facilitating the improvement of the connection quality and connection convenience between the terminal post component 3 and the housing component 1, as well as the connection quality and connection convenience between the terminal post component 3 and the conductive part 23.

[0184] For example, in some embodiments, both the terminal post body 37 and the adapter structure 38 are made of metal. The terminal post body 37 is connected to the conductive part 23 by welding, and the adapter structure 38 is connected to the housing component 1 by welding. At this time, the relative position between the adapter structure 38 and the housing component 1 can be flexibly set. For example, the adapter structure 38 can be covered on the outside of the housing component 1, or covered on the inside of the housing component 1, or penetrate through the housing component 1, etc., thereby facilitating flexible design and assembly. Moreover, by welding the adapter structure 38 to the housing component 1, it is beneficial to improve the connection reliability between the housing component 1 and the adapter structure 38.

[0185] In a specific embodiment of the present application, referring to Figure 13 , the edge of the adapter structure 38 is arranged around the mounting hole 12 and overlaps on the side of the housing component 1 away from the accommodation cavity 11. The adapter structure 38 is a metal part and is connected to the housing component 1 by welding. Thus, the adapter structure 38 can be relatively easily fitted and connected to the housing component 1, and the connection part is easy to inspect, improving the connection reliability.

[0186] In some embodiments of the present application, referring to Figure 14The insulating structure 39 includes a sealing structure 391 , which is arranged around the peripheral side of the transition structure 38 close to the pole body 37 , and the sealing structure 391 is clamped between the transition structure 38 and the pole body 37 . In a conventional structure, the pole needs to be pressed on a seal placed on the shell to achieve sealing. However, in this sealing method, in order to ensure the pre-tightening force required for sealing, the pressure applied by the pole to the shell is relatively large. When the shell is thin, it is easy to cause deformation or damage to the shell. In the embodiment of the present application, a sealing structure 391 is provided at the connection between the pole body 37 and the transition structure 38 to perform a sealing function, so that the pole component 3 itself has self-sealing properties. When the pole component 3 is installed on the shell component 1, there is no need to consider insulation and sealing issues between the transition structure 38 and the shell component 1. It is only necessary to complete a reliable connection throughout the whole circle. Therefore, there is no need to apply a large force through the pole component 3 and the shell component 1, thereby improving the problem of deformation of the shell component 1 under stress, which is beneficial to reducing the thickness of the shell component 1, reducing material costs, and reducing the weight of the battery cell 102, thereby improving energy density.

[0187] In some embodiments of the present application, reference Figure 14 The insulating structure 39 includes an injection-molded structural member 392, and the transfer structure 38 and the pole body 37 are integrally injection-molded and connected to the injection-molded structural member 392. Therefore, the injection-molded structural member 392 not only plays an insulating role, but also plays a role in fixing the pole body 37 and the transfer structure 38, thereby simplifying the processing and molding of the pole component 3. For example, the pole body 37 and the transfer structure 38 can be injection-molded to obtain the injection-molded structural member 392, and then the transfer structure 38 can be bent, and the sealing structural member 391 can be pressed between the pole body 37 and the transfer structure 38, so that quick assembly can be achieved.

[0188] For example, in other embodiments, the insulating structure 39 may not include the injection molded structure 392, but only include one or more sealing structures 391. In this case, the transition structure 38, the sealing structure 391 and the pole body 37 can be fixedly connected by riveting the transition structure 38 or other methods.

[0189] According to the second aspect of the present application, the present application also provides a battery device 100, comprising a battery cell 102 and a busbar component 103 according to any of the above solutions, wherein the busbar component 103 is used to connect multiple battery cells 102. Therefore, since the thickness of the pole component 3 is reduced, it is beneficial to reduce the overall weight and cost of the battery device 100.

[0190] It is worth noting that the battery device 100 according to the embodiment of the present application may include a box body 101 or may not include a box body 101. Figure 2, the battery device 100 includes a box body 101. A plurality of battery cells 102 are accommodated in the box body 101, and the bottom of the box body 101 is the box body bottom plate. The pole column component 3 is disposed on one side of the housing component 1 close to the box body bottom plate, or on one side of the housing component 1 away from the box body bottom plate. During the use of the battery device 100, for example, when used in a vehicle, the box body bottom plate is at the bottom of the box body 101 in the gravity direction. Thus, when the pole column component 3 is disposed on one side of the housing component 1 close to the box body bottom plate, it means that the pole column component 3 is at the bottom of the housing component 1 in the gravity direction; while when the pole column component 3 is disposed on one side of the housing component 11 away from the box body bottom plate, it means that the pole column component 3 is at the top of the housing component 1 in the gravity direction. Therefore, the relative position between the pole column component 3 and the box body bottom plate is not limited, and flexible setting of the orientation of the battery cell 102 and the box body 101 can be achieved.

[0191] Among them, when the pole column component 3 of the battery cell 102 is disposed on the side of the housing component 1 facing the box body bottom plate, the battery cell 102 is in an inverted state, and the products of pressure relief are ejected in a direction away from the passenger compartment, which is safer; when the pole column component 3 of the battery cell 102 is disposed on the side of the housing component 1 away from the box body bottom plate, the battery cell 102 is in a normal state, and the electrolyte is not easily leaked.

[0192] In some embodiments of the present application, in combination with Figure 13 , on the projection plane perpendicular to the central axis L of the pole column component 3, the positive projections of the first connection portion 4 and the second connection portion 5 both fall within the positive projection range of the mounting hole 12. Thus, the mounting hole 12 is not likely to affect the cooperation and connection between the conductive portion 23 and the pole column component 3, and the connection between the bus bar component 103 and the pole column component 3 is not likely to have an adverse effect on the housing component 1.

[0193] According to the third aspect embodiment of the present application, the embodiments of the present application further provide an electrical device, including the battery device 100 of any of the above solutions, and the battery device 100 is used to provide electrical energy for the electrical device. The electrical device can be any of the foregoing devices or systems applying the battery device 100. Since the performance of the battery device 100 is improved, it is beneficial to improve the working power consumption performance of the electrical device.

[0194] Next, a specific embodiment according to the present application will be described.

[0195] The battery cell 102 includes: a housing component 1, an electrode component 2, and a terminal component 3. The housing component 1 defines a receiving cavity 11 and has a mounting hole 12; the electrode component 2 includes an active material coating portion 21 and a conductive portion 23. The active material coating portion 21 is received in the receiving cavity 11, and the conductive portion 23 is connected to the active material coating portion 21; the terminal component 3 is disposed at the mounting hole 12 and connected to the housing component 1. The terminal component 3 includes a first portion 31 and a second portion 32. The first portion 31 is ultrasonically welded to the conductive portion 23, and the second portion 32 is laser welded to the bus bar component 103. A groove 33 is formed in the terminal component 3 and recessed in a direction away from the receiving cavity 11. The groove 33 is open in the direction toward the receiving cavity 11. The portion of the terminal component 3 on the side of the groove 33 away from the receiving cavity 11 is the first portion 31, and at least a part of the conductive portion 23 is received in the groove 33 to be connected to the first portion 31. The first portion 31 and the second portion 32 are different parts of the terminal component 3, so that the conductive portion 23 and the bus bar component 103 are staggered. The thickness of the terminal component 3 at the second portion 32 is greater than that at the first portion 31. For example, in the length direction of the terminal component 3, the second portion 32 is on the side outside the groove 33, or in the width direction of the terminal component 3, the second portion 32 is on the side outside the groove 33.

[0196] Thus, by ultrasonically welding the conductive portion 23 to the first portion 31, compared with the solution of first ultrasonically pre-welding the conductive portion 23 itself and then connecting it to the first portion 31 by laser welding, one welding process can be saved, the manufacturing process can be optimized, the welding yield can be improved, the problem of particulate matter formed by welding entering the receiving cavity 11 can be reduced, the performance of the battery cell 102 can be improved, and it is beneficial to save equipment and workshops and reduce production costs. And by staggering the second portion 32 and the first portion 31, when the conductive portion 23 is ultrasonically welded to the first portion 31, the indentation of the solder pad flowing on the outer surface of the first portion 31 is avoided, which affects the laser welding between the bus bar component 103 and the terminal component 3. By locally thinning the terminal component 3 to form the groove 33, the material, weight and cost of the terminal component 3 can be saved, and the conductive portion 23 is received in the groove 33, which is beneficial to improve the energy density of the battery cell 102, is beneficial for the battery cell 102 to accommodate more electrolyte and generated gas, and improves the performance and life of the battery cell 102.

[0197] In this embodiment, the electrode component 2 includes an active material coating portion 21 and an electrode tab portion 22. The two ends of the electrode tab portion 22 are respectively connected to two active material coating portions 21. The portion of the electrode tab portion 22 located between the two ends of the electrode tab portion 22 includes a connection portion 223. The electrode tab portion 22 has a pre-connection portion 224 for connecting multiple layers of electrode tab sheets in the electrode tab portion 22 together. A pre-connection portion 224 is provided between each end of the electrode tab portion 22 and the connection portion 223. The pre-connection portion 224 is an ultrasonic welding mark. The connection portion 223 is connected to the first portion 31. A support member 6 is provided in the space formed between the active material coating portion 21 and the electrode tab portion 22. The support member 6 is used to support the electrode tab portion 22. The support member 6 is a glue film pasted on the side of the electrode tab portion 22 facing the active material coating portion 21.

[0198] The electrode tab portion 22 includes a common electrode tab portion 22a that is simultaneously connected to multiple active material coating portions 21. The two ends of the common electrode tab portion 22a are respectively connected to two active material coating portions 21. The portion of the common electrode tab portion 22a located between the two ends of the common electrode tab portion 22a includes a connection portion 223. The connection portion 223 is connected to the first portion 31. Thus, by connecting two active material coating portions 21 through the common electrode tab portion 22a, after the active material coating portions 21 are wound, there is no problem of unevenness and need for cutting of the multiple layers of electrode tab sheets at the connection portion 223 in the common electrode tab portion 22a, thereby saving materials and processes, reducing costs, and improving production efficiency. Moreover, the two active material coating portions 21 are connected to the electrode post component 3 through the common electrode tab portion 22a. Compared with each active material coating portion 21 being respectively connected to the electrode post component 3 through a separate electrode tab portion 22, the production cycle can be improved. And, compared with each active material coating portion 21 separately outputting a separate electrode tab portion 22b and laying the separate electrode tab portions 22b flat without overlapping and respectively connecting them to the electrode post component 3 separately, the overall space occupied by the electrode tab portion 22 can be saved, which is beneficial for the electrode tab portion 22 to be staggered from the bus bar component 103, making the areas of both the first connection portion 4 and the second connection portion 5 relatively large.

[0199] The processing steps of the battery cell 102 are briefly introduced below. Combining Figure 16A , first, the two active material coating portions 21 are unfolded, and the multiple layers of electrode tab sheets in the center of the common electrode tab portion 22a are gathered into a stack. Combining Figure 16B and 16C , the position of the common electrode tab portion 22a near the root is ultrasonically welded using a welding head 401 and a welding seat 402 to obtain two pre-connection portions 224 to improve the problem of loose redundancy of the multiple layers of electrode tab sheets in the common electrode tab portion 22a. Combining Figure 16D , the connection portion 223 of the common electrode tab portion 22a located between the two pre-connection portions 224 is ultrasonically welded to the electrode post body 37. Combining Figure 16E, a blue film is pasted on the surface of the pole ear part 22 away from the pole column body 37 as the support member 6, combined with Figure 16F , the two active material coating parts 21 are stacked close to each other, and then loaded into the housing part 1, and the pole column part 3 is connected to the housing part 1, combined with Figure 16G , the bus bar component 103 is assembled outside the pole column component 3, the bus bar component 103 avoids the position of the welding seat imprint formed by welding the pole ear part 22 on the pole column component 3, and the bus bar component 103 is welded to the pole column component 3 by laser welding.

[0200] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0201] The above are only the preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A battery cell, characterized in that, Comprising: A housing component that defines a receiving cavity and has a mounting hole; An electrode component including an active material coating portion and a conductive portion, the active material coating portion being received in the receiving cavity, and the conductive portion being connected to the active material coating portion; A pole column component disposed at the mounting hole and connected to the housing component, the pole column component including a first portion and a second portion, the first portion being connected to the conductive portion, and the second portion being for connecting to a bus bar component that connects a plurality of the battery cells, the first portion and the second portion being different parts of the pole column component so that the conductive portion and the bus bar component are arranged in a staggered manner.

2. The battery cell according to claim 1, wherein The first portion and the conductive portion are ultrasonically welded to form a first connection portion.

3. The battery cell according to claim 1, wherein The thickness of the pole column component at the first portion is less than the thickness at the second portion.

4. The battery cell according to claim 1, characterized in that, A groove is formed on the pole column component and is recessed in a direction away from the receiving cavity, the groove being open in a direction towards the receiving cavity, and a portion of the pole column component on a side of the groove away from the receiving cavity is the first portion, and at least a part of the conductive portion is received in the groove to be connected to the first portion.

5. The battery cell according to claim 4, wherein The pole column component includes a first pole column component, the first pole column component including a first conductive member and a second conductive member made of different materials, the first conductive member including a first sub-portion and a second sub-portion, the first sub-portion protruding relative to the second sub-portion in a direction away from the receiving cavity to form the groove on a side of the first sub-portion close to the receiving cavity, and the first portion being constituted by the first sub-portion, and the second conductive member being disposed on a side of the second sub-portion away from the receiving cavity so that the second sub-portion and the second conductive member are stacked to constitute the second portion.

6. The battery cell according to claim 5, characterized in that, The thickness of the second sub-portion is less than the thickness of the first sub-portion.

7. The battery cell according to claim 4, characterized in that, The pole column component includes a second pole column component, the second pole column component including a third conductive member with uniform material throughout, a local thinning of the third conductive member to form the groove, a thinned portion of the third conductive member corresponding to the groove constituting the first portion, and a non-thinned portion of the third conductive member staggered from the groove constituting the second portion.

8. The battery cell according to claim 4, characterized in that, The pole column component is of a strip-shaped structure, the groove is strip-shaped and the length direction extends along the length direction of the pole column component, wherein the length of the groove exceeds half of the length of the pole column component; and / or the width of the groove exceeds half of the width of the pole column component.

9. The battery cell according to claim 4, wherein On a projection plane perpendicular to the central axis of the pole column component, the projected area of the groove is larger than the projected area of the second portion.

10. The battery cell according to claim 1, characterized in that, The first portion and the conductive portion are connected to form a first connection portion, the pole column component is of a strip-shaped structure, and the first connection portion is strip-shaped and the length direction extends along the length direction of the pole column component.

11. The battery cell according to claim 10, characterized in that, The length of the first connection portion exceeds half of the length of the pole column component; and / or the central position in the width direction of the first connection portion falls at the central position in the width direction of the pole column component.

12. The battery cell according to claim 1, wherein, A side surface of the first portion facing away from the accommodating cavity is flush with a side surface of the second portion facing away from the accommodating cavity.

13. The battery cell according to claim 1, characterized in that, The electrode component includes a tab portion connected to the active material coating portion, and the tab portion constitutes the conductive portion to be connected to the first portion.

14. The battery cell according to claim 13, wherein The pole ear portion includes a common pole ear portion connected to multiple active material coating portions at the same time, and the two ends of the common pole ear portion are respectively connected to two of the active material coating portions. The part of the common pole ear portion located between the two ends of the common pole ear portion includes a connecting portion, and the connecting portion is connected to the first portion.

15. The battery cell according to claim 14, wherein The common pole lug portion has a pre-connection portion for connecting the multiple pole lug sheets in the common pole lug portion together, and the pre-connection portion is provided between each of the two ends of the common pole lug portion and the connection portion.

16. The battery cell according to claim 15, characterized in that, The pre-connection portion is an ultrasonic weld.

17. The battery cell according to claim 14, characterized in that, A support member is provided in a space formed between the active material coating portion and the common electrode lug portion, and the support member is used to support the common electrode lug portion.

18. The battery cell according to claim 17, characterized in that, The support member is a rubber film adhered to a side of the common electrode ear portion facing the active material coating portion.

19. The battery cell according to claim 13, wherein The electrode lug portion includes a separate electrode lug portion connected to only a single active material coating portion, and a plurality of separate electrode lug portions of the same polarity are stacked.

20. The battery cell according to claim 1, wherein The electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive sheet connected to the pole ear portion, and the conductive sheet is connected to the first portion.

21. The battery cell according to any one of claims 1-20, characterized in that, The pole component includes a pole body, a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the shell component. The insulating structure is insulated and connected between the transition structure and the pole body. The conductive part is connected to the pole body. The pole body includes the first part and the second part.

22. The battery cell according to claim 21, wherein, The edge of the transition structure is arranged around the mounting hole and overlapped on a side of the shell component away from the accommodating cavity. The transition structure is a metal component and is welded to the shell component.

23. The battery cell according to claim 21, wherein, The insulating structure comprises a sealing structure, which is arranged around the peripheral side of the transition structure close to the pole body, and is clamped between the transition structure and the pole body.

24. The battery cell according to claim 23, characterized in that, The insulating structure comprises an injection-molded structural component, and the transition structure and the pole body are integrally injection-molded and connected to the injection-molded structural component.

25. A battery device, characterized in that, include: A battery cell and a busbar component for connecting a plurality of the battery cells, wherein the battery cell is a battery cell according to any one of claims 1-24, the first portion is connected to the conductive portion to form a first connecting portion, and the busbar component is connected to the second portion to form a second connecting portion.

26. The battery device according to claim 25, characterized in that, The pole component is an elongated structure, the first connecting portion is an elongated structure and its length direction extends along the length direction of the pole component, the second connecting portion is located at one end of the first connecting portion in the length direction, and the length of the second connecting portion in the length direction of the pole component is less than the length of the first connecting portion.

27. The battery device according to claim 25, wherein The pole component is of a strip-shaped structure. The first connecting portion is strip-shaped and its length direction extends along the length direction of the pole component. The second connecting portion is annular and is arranged to surround the first connecting portion.

28. The battery device according to claim 25, characterized in that, The pole component is of a strip-shaped structure. The first connecting portion is strip-shaped and its length direction extends along the length direction of the pole component. The second connecting portion is strip-shaped and its length direction extends along the length direction of the pole component. The second connecting portion is located on one side in the width direction of the first connecting portion.

29. The battery device according to claim 25, wherein, The busbar component and the second part are laser welded to form the second connecting portion.

30. The battery device according to any one of claims 25-29, characterized in that, On the projection plane perpendicular to the central axis of the pole component, the orthographic projections of the first connecting portion and the second connecting portion both fall within the orthographic projection range of the mounting hole.

31. An electrical device, characterized in that, Comprising the battery device according to any one of claims 25 - 30.

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