Battery cell, battery device and electric device

Abstract

A battery cell, a battery device and an electric device, belonging to the technical field of batteries. The battery cell comprises: a casing component, a terminal post component and an electrode component, wherein the casing component defines an accommodating cavity and is provided with a mounting hole; the electrode component comprises an active material coating portion and a conductive portion, the active material coating portion being accommodated in the accommodating cavity, and the conductive portion being connected to the active material coating portion; and the terminal post component is disposed at the mounting hole and is connected to the casing component, the terminal post component comprises a first part and a second part, the first part being connected to the conductive portion, and the second part being configured to connect to a busbar component that connects a plurality of battery cells; the first part and the second part are different parts of the terminal post component, enabling the conductive portion and the busbar component to be staggered.

Description

Battery cell, battery device and electric device

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202421970297.X, filed on August 14, 2024, the entire contents of which are hereby incorporated by reference into the present application. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery device, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0004] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power battery devices play an irreplaceable important role as the power source of electric vehicles. Among them, the power battery device includes a plurality of battery cells. However, the material cost of the battery cell is relatively high. SUMMARY

[0005] The embodiments of the present application provide a battery cell, a battery device and an electric device, which are beneficial to reduce the material cost of the battery cell as a whole.

[0006] In a first aspect, the embodiments of the present application provide a battery cell, which includes a housing component, a pole component and an electrode component. The housing component defines a receiving cavity and has a mounting hole. The electrode component includes an active material coating part and a conductive part. The active material coating part is received in the receiving cavity, and the conductive part is connected to the active material coating part. The pole component is arranged at the mounting hole and connected to the housing component. The pole component includes a first part and a second part. The first part is connected to the conductive part, and the second part is used to be connected to a busbar component connected to a plurality of battery cells. The first part and the second part are different parts of the pole component, so that the conductive part and the busbar component are arranged staggered.

[0007] In the above technical solution, the conductive part and the busbar part are connected with different parts of the pole part respectively, so that when the busbar part is connected with the pole part, the adverse effects caused by the connection between the conductive part and the pole part can be reduced, and the connection between the conductive part and the pole part will not adversely affect the connection between the busbar part and the pole part, thereby helping to ensure the connection quality of the busbar part and the pole part, and the connection quality of the conductive part and the pole part. Moreover, by connecting the conductive part and the busbar part with different parts of the pole part respectively, the thickness and material of the first part of the pole part for connecting with the conductive part only need to meet the connection with the conductive part, and the thickness and material of the second part of the pole part for connecting with the busbar part only need to meet the connection with the busbar part, and the thicknesses of the first part and the second part do not need to be superimposed, which is conducive to reducing the thickness of the pole part, thereby helping to reduce the weight and cost of the battery monomer as a whole, and can reduce the space occupation of the pole part inside or outside the shell, when reducing the space occupation of the pole part inside the shell part, it is helpful to improve the injection amount of electrolyte and the gas production capacity of the battery monomer, it is helpful to increase the volume of the electrode part accommodated by the shell part, and to improve the energy density of the battery monomer, and when reducing the space occupation of the pole part outside the shell part, the volume of the battery monomer can be reduced, thereby reducing the volume or increasing the energy density of the battery device.

[0008] In some embodiments, the first part is ultrasonically welded with the conductive part to form the first connection part.

[0009] In the above technical solution, the conductive part and the busbar part are connected with different parts of the pole part respectively, so that when the busbar part is connected with the pole part, the adverse effects caused by the connection between the conductive part and the pole part can be reduced, and the connection between the conductive part and the pole part will not adversely affect the connection between the busbar part and the pole part, thereby helping to ensure the connection quality of the busbar part and the pole part, and the connection quality of the conductive part and the pole part. Moreover, by connecting the conductive part and the busbar part with different parts of the pole part respectively, the thickness and material of the first part of the pole part for connecting with the conductive part only need to meet the connection with the conductive part, and the thickness and material of the second part of the pole part for connecting with the busbar part only need to meet the connection with the busbar part, and the thicknesses of the first part and the second part do not need to be superimposed, which is conducive to reducing the thickness of the pole part, thereby helping to reduce the weight and cost of the battery monomer as a whole, and can reduce the space occupation of the pole part inside or outside the shell, when reducing the space occupation of the pole part inside the shell part, it is helpful to improve the injection amount of electrolyte and the gas production capacity of the battery monomer, it is helpful to increase the volume of the electrode part accommodated by the shell part, and to improve the energy density of the battery monomer, and when reducing the space occupation of the pole part outside the shell part, the volume of the battery monomer can be reduced, thereby reducing the volume or increasing the energy density of the battery device.

[0010] In some embodiments, the thickness of the pole part at the first part is smaller than the thickness at the second part.

[0011] In the technical solution, the first part is relatively thin, which is conducive to ultrasonic welding of the conductive part and the first part. The step of welding the busbar component is generally performed after the battery cell is assembled as a whole, and the welding of the busbar component and the second part can be directly performed from the outside of the battery cell. Since 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 depth of penetration requirement, thereby improving the connection reliability of the busbar component and the pole component. In addition, since the thickness of the first part is less than that of the second part, the pole component is thinned at the first part, thereby saving the material, cost, and weight of the pole component.

[0012] In some embodiments, a groove recessed toward a direction away from the accommodation cavity is formed on the pole component, the groove is open toward the accommodation cavity, a part of the pole component on a 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 with the first part.

[0013] In the technical solution, at least part of the conductive part is received in the groove formed on the pole component, which reduces the space occupied by the conductive part in the accommodation cavity, thereby improving the volume of the active material coating part, increasing the energy density of the battery cell, and accommodating more electrolyte and gas to improve the performance of the battery cell. In addition, the groove formed on the pole component thins the position where the first part is arranged, thereby saving the material, cost, and weight of the pole component. The pole component and the conductive part can be connected by ultrasonic welding, thereby saving the welding process, improving the welding yield, improving product quality, saving equipment and factory, and reducing production cost.

[0014] In some embodiments, the pole component includes a first pole component, the first pole component includes first and second conductive parts having different materials, the first conductive part includes first and second sub-parts, the first sub-part protrudes toward a direction away from the accommodation cavity relative to the second sub-part to form a groove on a side of the first sub-part close to the accommodation cavity, and the first sub-part constitutes the first part. The second conductive part is arranged on a side of the second sub-part away from the accommodation cavity to constitute the second part by stacking the second sub-part and the second conductive part.

[0015] In the technical solution, the first pole part is made of different materials, the first conductive part is made of the same material as the conductive part, and the second conductive part is made of the same material as the bus part, thereby facilitating the connection of the pole part with the conductive part and the bus part. In addition, the second conductive part is arranged on the side of the first conductive part away from the accommodating cavity, thereby facilitating the connection of the first conductive part with the second conductive part and improving the connection reliability.

[0016] In some embodiments, the thickness of the second sub-part is less than the thickness of the first sub-part.

[0017] In the technical solution, the second sub-part is used to support the second conductive part and does not need to be connected with the conductive part or the bus part, thereby reducing the thickness of the second sub-part, saving the material, weight and cost of the first conductive part.

[0018] In some embodiments, the pole part includes a second pole part, the second pole part includes a third conductive part with uniform material, and the third conductive part is partially thinned to form a groove. The thinned part of the third conductive part corresponding to the groove forms a first part, and the non-thinned part of the third conductive part offset from the groove forms a second part.

[0019] In the technical solution, the second pole part is made of the same material, thereby simplifying the structure and processing of the second pole part. In addition, the groove is formed by thinning at the position where the connection with the conductive part is needed, thereby saving the material, weight and cost of the second pole part and facilitating the ultrasonic welding with the conductive part. The non-thinned part is connected with the bus part, thereby meeting the penetration requirement and the welding requirement of the bus part.

[0020] In some embodiments, the pole part has a strip shape, the groove has a strip shape and extends along the length direction of the pole part, the length of the groove is more than half of the length of the pole part, and / or the width of the groove is more than half of the width of the pole part.

[0021] In the technical solution, the space of the pole part can be fully utilized to form a larger groove, thereby reducing the material, weight and cost of the pole part to a greater extent and providing a larger space for accommodating the conductive part, accommodating the gas generated by the battery monomer, or accommodating the electrolyte, thereby improving the energy density or performance of the battery monomer.

[0022] In some embodiments, the second part has a smaller thickness than the first part.

[0023] In the technical solution, the space of the pole piece can be fully utilized to form a larger groove, so that the material, weight and cost of the pole piece can be reduced to a greater extent, and the space can be used to accommodate the conductive part or accommodate the gas generated by the battery cell or accommodate the electrolyte, so as to improve the energy density or performance of the battery cell.

[0024] In some embodiments, the first part is connected with the conductive part to form a first connecting part, the pole piece has a strip-shaped structure, and the first connecting part has a strip shape and extends along the length direction of the pole piece.

[0025] In the technical solution, the space of the pole piece can be fully utilized to form a larger groove, so that the material, weight and cost of the pole piece can be reduced to a greater extent, and the space can be used to accommodate the conductive part or accommodate the gas generated by the battery cell or accommodate the electrolyte, so as to improve the energy density or performance of the battery cell.

[0026] In some embodiments, the length of the first connecting part exceeds half of the length of the pole piece; and / or, the center position of the first connecting part in the width direction falls on the center position of the pole piece in the width direction.

[0027] In the technical solution, when the length of the first connecting part exceeds half of the length of the pole piece, the space of the pole piece can be more fully utilized; when the center position of the first connecting part in the width direction falls on the center position of the pole piece in the width direction, the first connecting part is centrally arranged relative to the pole piece, so that the connection of the conductive part and the pole piece is facilitated, the operation convenience is improved, and the cooperation of the conductive part and the pole piece is facilitated; when the length of the first connecting part exceeds half of the length of the pole piece and when the center position of the first connecting part in the width direction falls on the center position of the pole piece in the width direction, the space of the pole piece can be more fully utilized by the first connecting part, so that the connection reliability of the first part and the conductive part is further improved, and the conductive efficiency of the pole piece and the electrode piece is improved, and the charging efficiency is improved.

[0028] In some embodiments, the side surface of the first part away from the accommodation cavity is flush with the side surface of the second part away from the accommodation cavity.

[0029] In the technical solution, the outer surface of the pole piece can be relatively flat, which is conducive to the support of the outer surface of the pole piece to the welding pressure nozzle when the pole piece is welded with the busbar, or in some cases, the outer surface of the pole piece can also be used to support other components.

[0030] In some embodiments, the electrode piece includes a tab part connected with the active material coated part, and the tab part constitutes the conductive part to be connected with the first part.

[0031] In the technical solution, the conductive part is simple in structure and can improve production efficiency.

[0032] In some embodiments, the tab part includes a shared tab part connected to the plurality of active material coating parts at the same time, two ends of the shared tab part are connected to the two active material coating parts respectively, and a connecting part is included in a part of the shared tab part between the two ends of the shared tab part, and the connecting part is connected to the first part.

[0033] In the technical solution, the two active material coating parts are connected by the shared tab part, after the active material coating parts are wound, the connecting part in the shared tab part does not need to be cut, thereby saving materials and processes, reducing costs, and improving production efficiency. Moreover, the two active material coating parts are connected to the pole part by the shared tab part, which can improve the production rhythm compared to connecting each active material coating part to the pole part by a separate tab part. Furthermore, compared to separately outputting separate tab parts for each active material coating part and laying out the plurality of separate tab parts without stacking and separately connecting them to the pole part, the space occupied by the tab part as a whole can be saved, which is conducive to staggering the tab part and the busbar part, so that the areas of the first connecting part and the second connecting part are relatively large.

[0034] In some embodiments, the shared tab part has a pre-connection part for connecting the plurality of tab pieces in the shared tab part together, and the pre-connection part is arranged between each of the two ends of the shared tab part and the connecting part.

[0035] In the technical solution, the pre-connection part is arranged between each of the two ends of the shared tab part and the connecting part, so that the connecting part is located between the two pre-connection parts, and the plurality of tab pieces in the connecting part can be gathered together, thereby facilitating the connection operation of the connecting part and the pole part.

[0036] In some embodiments, the pre-connection part is an ultrasonic welding mark.

[0037] In the technical solution, the pre-connection part is obtained by ultrasonic welding, thereby facilitating operation, having high connection efficiency, and being low in cost.

[0038] In some embodiments, a support is arranged in a space formed between the active material coating part and the shared tab part, and the support is used to support the shared tab part.

[0039] In the technical solution, the problem of the plurality of tab pieces in the connecting part being scattered and redundant can be improved, so that the plurality of tab pieces in the connecting part can be gathered together, thereby facilitating the connection operation of the connecting part and the pole part.

[0040] In some embodiments, the support is an adhesive film attached to one side of the common tab facing the active material coating.

[0041] In the above technical solution, the support has a simple structure, is easy to set up, and reliably supports the tab without damaging the active material coating and the tab.

[0042] In some embodiments, the tab includes a single tab connected only to a single active material coating, and multiple single tabs of the same polarity are stacked.

[0043] In the above technical solution, the single tabs are stacked, which saves space occupied by the entire tab, facilitates the tab to be staggered with the busbar component, and makes the areas of the first and second connecting portions relatively large.

[0044] In some embodiments, the electrode component includes a tab connected to the active material coating, the conductive portion includes the tab and a conductive sheet connected to the tab, and the conductive sheet is connected to the first portion.

[0045] In the above technical solution, the length of the tab can be shortened, the material of the current collector can be saved, and the processing of the current collector is facilitated.

[0046] In some embodiments, the pole component includes a pole body, an adapter structure, and an insulating structure, the adapter structure surrounds the pole body and is connected to the housing component, the insulating structure is insulatively connected between the adapter structure and the pole body, the conductive portion is connected to the pole body, and the pole body includes a first portion and a second portion.

[0047] In the above technical solution, the pole component includes a pole body for connecting to the conductive portion, an adapter structure connected to the housing component, and an insulating structure between the adapter structure and the pole body, so that the structure of the pole component can be flexibly set up without affecting the connection with the conductive portion or the connection with the housing component, thereby improving the connection quality and convenience of the pole component with the housing component and the conductive portion.

[0048] In some embodiments, the edge of the adapter structure surrounds the mounting hole and is lapped on the side of the housing component away from the accommodation cavity, the adapter structure is a metal piece and is welded to the housing component.

[0049] In the above technical solution, the adapter structure can be relatively easily matched and connected with the housing component, and the connection is easy to check, thereby improving the reliability of the connection.

[0050] In some embodiments, the insulation structure comprises a sealing structure, which is annularly arranged on the circumferential side of the adapter structure close to the pole body, and is clamped between the adapter structure and the pole body.

[0051] In the above technical solution, the sealing structure is arranged at the connection between the pole body and the adapter structure to play a sealing role, so that the pole component itself has self-sealing property. When the pole component is installed on the shell component, the insulation and sealing between the adapter structure and the shell component do not need to be considered, and only reliable connection around the whole needs to be completed. Therefore, a larger force does not need to be applied to the shell component by the pole component, so that the stress deformation problem of the shell component can be improved, and the thickness of the shell component can be reduced, the material cost can be reduced, the weight of the battery monomer can be reduced, and the energy density can be improved.

[0052] In some embodiments, the insulation structure comprises an injection molding structure, and the adapter structure and the pole body are integrally injection molded with the injection molding structure.

[0053] In the above technical solution, the injection molding structure not only plays an insulation role, but also plays a role in fixedly connecting the pole body and the adapter structure, so that the processing and forming of the pole component can be simplified.

[0054] In a second aspect, the embodiments of the present application also provide a battery device, comprising the battery monomer of any one of the above-mentioned solutions and a busbar component for connecting a plurality of battery monomers, the first part and the conductive part are connected to form a first connection part, and the busbar component and the second part are connected to form a second connection part.

[0055] In the above technical solution, since the thickness of the pole component can be reduced to reduce the weight and cost of the battery monomer, the weight and cost of the battery device as a whole can be reduced.

[0056] In some embodiments, the pole component is a long strip structure, the first connection part is a long strip structure and the length direction extends along the length direction of the pole component, the second connection part is located at one end of the length direction of the first connection part, and the length of the second connection part in the length direction of the pole component is less than the length of the first connection part.

[0057] In the above technical solution, the first connection part can fully utilize the space of the pole component, which is conducive to increasing the connection area of the first part and the conductive part, improving the connection reliability of the first part and the conductive part, improving the conductive efficiency of the pole component and the electrode component, and improving the charging efficiency. Moreover, the busbar component with a relatively small length in the length direction of the pole component can be adapted, and the reliable staggering of the busbar component and the conductive part can be easily realized.

[0058] In some embodiments, the pole part is a long strip structure, the first connecting part is a long strip structure and extends along the length direction of the pole part, and the second connecting part is a ring structure and is arranged around the first connecting part.

[0059] In the above technical solution, the first connecting part can make full use of the space of the pole part, which is conducive to increasing the connection area of the first part and the conductive part, thereby improving the connection reliability of the first part and the conductive part, improving the conductive efficiency of the pole part and the electrode part, and improving the charging efficiency. Moreover, the busbar part with a relatively large length in the length direction of the pole part can be adapted, and the reliable staggering of the busbar part and the conductive part can be easily realized, and the area of the second connecting part can be easily increased to improve the conductive efficiency.

[0060] In some embodiments, the pole part is a long strip structure, the first connecting part is a long strip structure and extends along the length direction of the pole part, and the second connecting part is a long strip structure and extends along the length direction of the pole part, and the second connecting part is located on one side of the first connecting part in the width direction.

[0061] In the above technical solution, the first connecting part can make full use of the space of the pole part, which is conducive to increasing the connection area of the first part and the conductive part, thereby improving the connection reliability of the first part and the conductive part, improving the conductive efficiency of the pole part and the electrode part, and improving the charging efficiency. Moreover, the busbar part with a relatively large length in the length direction of the pole part can be adapted, and the reliable staggering of the busbar part and the conductive part can be easily realized, and the area of the second connecting part can be easily increased to improve the conductive efficiency.

[0062] In some embodiments, the busbar part and the second part are laser welded to form the second connecting part.

[0063] In the above technical solution, the connection of the busbar part and the pole part is facilitated, and the connection reliability of the busbar part and the pole part is improved.

[0064] In some embodiments, on a projection plane perpendicular to the central axis of the pole part, the first connecting part and the second connecting part are both within the projection range of the mounting hole.

[0065] In the above technical solution, the mounting hole does not easily affect the cooperation and connection of the conductive part and the pole part, and the connection of the busbar part and the pole part does not easily adversely affect the shell part.

[0066] In a third aspect, the embodiments of the present application also provide a power utilization device, which comprises the battery device of any of the above-mentioned solutions.

[0067] In the above technical solution, the performance of the battery device is improved, thereby improving the working power performance of the power utilization device. Attached Figure Description

[0068] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0070] Figure 2 is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0071] Figure 3 is a perspective view of a battery cell provided in some embodiments of this application;

[0072] Figure 4 is a bottom view of a battery cell provided in some embodiments of this application;

[0073] Figure 5 is a cross-sectional view along line AA in Figure 4;

[0074] Figure 6 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0075] Figure 7 is a partial enlarged view of the terminal component of a battery cell provided in some embodiments of this application;

[0076] Figure 8 is a cross-sectional view along line BB in Figure 7;

[0077] Figure 9 is a cross-sectional view of the terminal component of a battery cell provided in some embodiments of this application;

[0078] Figure 10 is a schematic diagram showing the distribution of the first connecting portion and the second connecting portion provided in some embodiments of this application;

[0079] Figure 11 is a schematic diagram showing the distribution of the first connecting portion and the second connecting portion according to some other embodiments of this application;

[0080] Figure 12 is a schematic diagram showing the distribution of the first connecting portion and the second connecting portion provided in some embodiments of this application;

[0081] Figure 13 is a partial enlarged view of the terminal component of a battery cell provided in some other embodiments of this application;

[0082] Figure 14 is a partial enlarged view of the terminal component of a battery cell provided in some embodiments of this application;

[0083] Figure 15 is a partial enlarged view of the terminal component of a battery cell provided in some embodiments of this application;

[0084] FIGS. 16A-16G are exploded views of a battery cell processing according to an embodiment of the present application.

[0085] Reference signs: vehicle 1000; battery device 100; controller 200; motor 300; welding head 401; welding seat 402; case 101; first case body 1011; second case body 1012; battery cell 102; first direction X; second direction Y; third direction Z; fourth direction F1; fifth direction F2; housing member 1; accommodation cavity 11; mounting hole 12; electrode member 2; active material coating portion 21; tab portion 22; common tab portion 22a; individual tab portion 22b; first end 221; second end 222; connection site 223; pre-connection portion 224; conductive portion 23; conductive sheet 24; pole member 3; center axis L; first portion 31; side surface S1 of the first portion facing away from the accommodation cavity; second portion 32; side surface S2 of the second portion facing away from the accommodation cavity; groove 33; first pole member 3A; first conductive member 34; first sub-portion 341; second sub-portion 342; second conductive member 35; second pole member 3B; third conductive member 36; pole body 37; relay structure 38; insulation structure 39; sealing structure 391; injection molding structure 392; first connection portion 4; second connection portion 5; support member 6; current combining member 103. DETAILED DESCRIPTION

[0086] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including", "comprising" and "having" in the specification herein are meant to encompass the inclusion of one or more elements, not the exclusion of any other elements; the use of the terms "first", "second", and the like in the specification herein is intended to distinguish between similar objects only and is not intended to imply any order or priority.

[0088] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" or "in the embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive.

[0089] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0090] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0091] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0092] "Multiple" appearing in this application means more than two (including two).

[0093] In the embodiments of the application, the battery cell can be a secondary battery device, which refers to a battery cell that can be activated by charging after discharging. The battery cell can 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 hydrogen battery device, a nickel cadmium battery device, a lead-acid battery device, etc. The embodiments of the application are not limited in this regard. The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of the application are not limited in this regard. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell, and the embodiments of the application are not limited in this regard.

[0094] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component. In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells. As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie. In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box. As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0095] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box. As an example, the box forms an enclosed space inside to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. 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 with the frame, so that the box forms an enclosed space inside to accommodate the battery cell assembly. In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0096] The battery cell includes a housing component for accommodating an electrode component and an electrolyte, and a positive electrode post component and a negative electrode post component provided on the housing component. The housing component accommodates at least one electrode component therein, and the electrode component is composed of a positive electrode tab, a negative electrode tab, and a separator film, which can be a wound structure or a stacked structure, etc. The battery cell mainly works by moving metal ions between the positive electrode tab and the negative electrode tab.

[0097] The positive electrode tab can generally include a positive electrode current collector and a positive electrode active material layer, which 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, and serves as a 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.

[0098] The negative electrode tab can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated directly or indirectly on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serving as a 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.

[0099] To ensure that no fusing occurs when a large current is passed, the number of positive electrode tabs is multiple and the positive electrode tabs are stacked together to form a tab portion of the positive electrode, and the number of negative electrode tabs is multiple and the negative electrode tabs are stacked together to form a tab portion of the negative electrode. The housing member is provided with a post member, the tab portion of the positive electrode is electrically connected to the post member of the positive electrode, and the tab portion of the negative electrode is electrically connected to the post member of the negative electrode.

[0100] In the production process of the battery cell, the ultrasonic welding method can be used to first pre-weld the multiple tabs in the tab portion to form an ultrasonic welding mark, and then the laser welding method is used to weld the ultrasonic welding mark and the post member together to realize the connection and electrical conduction of the electrode member and the post member, and then the busbar member is assembled on the outside of the post member directly above the tab portion, and the busbar member is connected to the post member by laser welding. However, in order to ensure the penetration requirement of the busbar member during welding and not to affect the welding mark of the tab portion, the post member needs to be relatively thick, so that the cost and weight of the post member are relatively high.

[0101] Therefore, the embodiment of the present application proposes a battery cell, by setting the conductive portion of the electrode member and the busbar member to be connected to different parts of the post member, which is conducive to reducing the thickness of the post member, thereby reducing the weight and cost of the battery cell as a whole. In addition, when the thickness of the post member is reduced, the occupied space of the post member inside the housing member is reduced, which is conducive to increasing the injection amount of electrolyte and the gas production capacity of the battery cell, increasing the volume of the electrode member accommodated in the housing member, and improving the energy density of the battery cell. When the thickness of the post member is reduced, the occupied space of the post member outside the housing member is reduced, so that 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.

[0102] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0103] The following embodiments are described with a vehicle as an example for convenience of description.

[0104] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the 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 an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0105] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0106] Referring to FIG. 2, FIG. 2 is a structural explosion diagram of the battery device 100 provided by some embodiments of the present application. The battery device 100 includes a box body 101 and a plurality of battery monomers 102, and the battery monomers 102 are accommodated in the box body 101. The box body 101 is used to provide an assembly space for the battery monomers 102, and the box body 101 can adopt various structures. In some embodiments, the box body 101 can include a first box body 1011 and a second box body 1012, and the first box body 1011 and the second box body 1012 are mutually covered. The first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery monomers 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-shaped cover structure. The first box body 1011 is covered on the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define the assembly space. The first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 is covered on 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 have various shapes, such as a cylinder, a cuboid, etc.

[0107] In the battery device 100, the plurality of battery cells 102 can be connected in series or in parallel or in a mixed manner, where the mixed manner means that the plurality of battery cells 102 are connected in series and in parallel. The plurality of battery cells 102 can be directly connected in series or in parallel or in a mixed manner, and the plurality of battery cells 102 are accommodated in the box 101. Alternatively, the plurality of battery cells 102 can be connected in series or in parallel or in a mixed manner to form a plurality of battery modules, and the plurality of battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the box 101. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing the electric welding between the plurality of battery cells 102.

[0108] The battery device 100 further includes a current collecting component, and at least two of the plurality of battery cells 102 are electrically connected by the current collecting component. The current collecting component is used to connect the plurality of battery cells 102. In this way, the series and / or parallel connection of the plurality of battery cells 102 can be realized. For example, when the plurality of 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 by a current collecting component, and the cathode of the battery cell 102 is connected to the anode of the previous battery cell 102 by another current collecting component. For example, in combination with FIG. 6, the current collecting component 103 can be connected with the pole component 3 to realize the electrical connection between the battery cell 102 and the current collecting component 103.

[0109] Referring to the embodiment shown in FIG. 3, which is a perspective view of the battery cell 102 provided by 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.

[0110] Please refer to FIGS. 4-6, FIG. 4 is a bottom view of the battery cell 102 shown in FIG. 3, FIG. 5 is a sectional view along the line A-A in FIG. 4, and FIG. 6 is a partial sectional view of the battery cell 102 provided by some embodiments of the present application. In some embodiments of the present application, the battery cell 102 includes a shell component 1, an electrode component 2, and a pole component 3. The material of the shell component 1 is not limited, for example, aluminum shell, steel shell, aluminum plastic film, plastic, or other materials resistant to electrolyte corrosion.

[0111] The shell component 1 defines an accommodation cavity 11, and the shell component 1 has a mounting hole 12. The pole component 3 is arranged at the mounting hole 12 and is connected with the shell component 1. The electrode component 2 includes an active material coating part 21 and a conductive part 23. The active material coating part 21 is accommodated in the accommodation cavity 11, the conductive part 23 is connected with the active material coating part 21 and the pole component 3, so that the conductive part 23 is electrically connected between the active material coating part 21 and the pole component 3.

[0112] By setting the pole piece 3 at the mounting hole 12 on the housing piece 1, the pole piece 3 can be connected with the electrode piece 2 in the housing piece 1 and connected with the busbar piece 103 outside the housing piece 1 without being blocked by the housing piece 1. The electrode piece 2 includes a pole tab, which includes a current collector and an active material layer. A portion of the current collector coated with the active material layer is used to form an active material coated portion 21, and a portion of the current collector not coated with the active material layer is used to form a tab portion 22, which protrudes from the active material coated portion 21 towards the direction close to the pole piece 3. The conductive portion 23 includes the tab portion 22. For example, the conductive portion 23 can only be composed of the tab portion 22. One end of the tab portion 22 is connected with the active material coated portion 21, and the other end of the tab portion 22 is connected with the pole piece 3, so that the tab portion 22 is electrically connected between the active material coated portion 21 and the pole piece 3. For another example, in combination with FIG. 13, the conductive portion 23 can include the tab portion 22 and a conductive tab 24. One end of the tab portion 22 is connected with the active material coated portion 21, and the other end of the tab portion 22 is connected with one end of the conductive tab 24. The other end of the conductive tab 24 is connected with the pole piece 3, so that the tab portion 22 and the conductive tab 24 can be electrically connected between the active material coated portion 21 and the pole piece 3.

[0113] Please refer to FIG. 6 again, and in combination with FIG. 7 and FIG. 8. FIG. 7 is a partial enlarged view of the pole piece 3 of the battery cell 102 according to some embodiments of the present application. FIG. 8 is a sectional view along the line B-B in FIG. 7. The pole piece 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 the first connection portion 4, and the second portion 32 is used to connect with the busbar piece 103 to form the second connection portion 5. It is worth noting that the first portion 31 can be called as the first portion 31 only when its shape, size, material and other characteristics meet the connection requirements of the conductive portion 23, and the second portion 32 can be called as the second portion 32 only when its shape, size, material and other characteristics meet the connection requirements of the busbar piece 103.

[0114] For example, when the first portion 31 is connected with the conductive portion 23 by welding, the welding mark formed by welding the first portion 31 with the conductive portion 23 is the first connection portion 4. When the second portion 32 is connected with the busbar piece 103 by welding, the welding mark formed by welding the second portion 32 with the busbar piece 103 is the second connection portion 5. The welding method is not limited, for example, it can be ultrasonic welding, combination of ultrasonic pre-welding and laser welding, laser welding, resistance welding, pressure fusion welding, brazing, etc.

[0115] In the embodiments of the present application, in combination with FIG. 6 and FIG. 7, the first part 31 and the second part 32 are different parts of the pole piece 3, so that the conductive part 23 is arranged staggered with the busbar piece 103, that is, in the projection plane perpendicular to the central axis L of the pole piece 3 (for example, as shown in FIG. 7), the orthographic projection of the first part 31 on the projection plane does not overlap with the orthographic projection of the second part 32 on the projection plane, so that the conductive part 23 and the busbar piece 103 do not face each other along the extension direction of the central axis L of the pole piece 3, but are staggered in the direction perpendicular to the central axis L of the pole piece 3.

[0116] In the above technical solution, the conductive part 23 and the busbar piece 103 are connected with different parts of the pole piece 3 respectively, so that when the busbar piece 103 is connected with the pole piece 3, the adverse effects caused by the connection of the conductive part 23 with the pole piece 3 can be reduced, and the connection of the conductive part 23 with the pole piece 3 will not adversely affect the connection of the busbar piece 103 with the pole piece 3, thereby facilitating the guarantee of the connection quality of the busbar piece 103 with the pole piece 3 and the connection quality of the conductive part 23 with the pole piece 3.

[0117] In addition, if the same part of the pole piece is connected with the busbar piece and the conductive part respectively, the busbar piece and the conductive part will face each other along the central axis L of the pole piece, at this time, the thickness of the part of the pole piece needs to be thickened to avoid the influence of welding through, at this time, the weight and cost of the whole battery monomer will be affected. Moreover, considering that the material of the part needs to meet the welding requirements of the conductive part and the busbar piece, when the materials of the conductive part and the busbar piece are different (for example, the conductive part is copper and the busbar piece is aluminum), the part of the pole piece needs to be laminated with two kinds of materials (for example, the part needs to be in the form of lamination of copper layer and aluminum layer, the copper layer is connected with the conductive part, and the aluminum layer is connected with the busbar piece), and the thickness of the two kinds of materials needs to meet the respective welding requirements, so that the overall thickness of the part is thicker, and the internal and / or external space of the shell piece is occupied more, when the internal space of the shell piece is occupied more, the injection amount of electrolyte and the gas production capacity of the battery monomer are affected, or the volume of the accommodated electrode part is affected, and the energy density of the battery monomer is affected, and when the external space of the shell piece is occupied more, the volume of the battery monomer is larger, and the volume or energy density of the battery device is affected.

[0118] In the embodiments of the present application, by connecting the conductive part 23 and the busbar component 103 with different parts of the pole component 3 respectively, the thickness and material of the first part 31 of the pole component 3 for connecting the conductive part 23 only need to meet the connection requirement, and the thickness and material of the second part 32 of the pole component 3 for connecting the busbar component 103 only need to meet the connection requirement, the thicknesses of the first part 31 and the second part 32 do not need to be superimposed, which is conducive to reducing the thickness of the pole component 3, thereby reducing the weight and cost of the battery monomer 102 as a whole, and reducing the space occupation of the pole component 3 inside or outside the shell component 1. When the space occupation of the pole component 3 inside the shell component 1 is reduced, it is conducive to improving the injection amount of the electrolyte and the gas production capacity of the battery monomer 102, increasing the volume of the electrode component 2 accommodated in the shell component 1, and improving the energy density of the battery monomer 102. When the space occupation of the pole component 3 outside the shell component 1 is reduced, the volume of the battery monomer 102 can be reduced, thereby reducing the volume or increasing the energy density of the battery device 100.

[0119] In some embodiments of the present application, the conductive part 23 and the first part 31 form the first connecting part 4 through ultrasonic welding, so the first connecting part 4 is formed as an ultrasonic welding mark. The ultrasonic welding refers to ultrasonic welding.

[0120] In the above technical solution, the conductive part 23 and the pole component 3 are connected by ultrasonic welding, which requires that the thickness of the first part 31 be relatively small to ensure effective transmission of welding energy, thereby reducing the thickness of the first part 31 and the weight and cost of the pole component 3. Of course, the welding method of the conductive part 23 and the pole component 3 is not limited to this, for example, it can also be resistance welding, pressure fusion welding, brazing, and gluing.

[0121] In addition, since ultrasonic welding requires a welding seat and a welding head, the welding seat 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 seat causes the surface of the first part 31 away from the conductive part 23 to form many pits. If the busbar component 103 is welded to the pole component 3 at the position where the pits are formed, air holes will be formed in the welding mark of the busbar component 103 and the pole component 3 due to the pits, affecting the welding reliability of the busbar component 103 and the pole 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 component 3 at the position where the pits are formed, thereby avoiding the formation of air holes in the welding mark of the busbar component 103 and the pole component 3, and improving the welding reliability of the busbar component 103 and the pole component 3.

[0122] In addition, when the conductive part 23 is only composed of the tab part 22, if the tab part 22 and the pole part 3 are connected by laser welding, in order to avoid the gap between the multi-layer tab sheets affecting the welding reliability of the tab part 22 and the pole part 3, the multi-layer tab sheets need to be pre-welded into a solid sheet shape first, and then the solid sheet is laser welded to the pole part 3. In this way, two welding processes are required, not only the process time is longer, the production efficiency is lower, but also more equipment and factory buildings are needed, resulting in higher production cost, and the two welding processes are more likely to cause the welding yield to decrease, affecting the connection reliability of the conductive part 23 and the pole part 3, and affecting the product quality. In the embodiments of the present application, when the tab part 22 and the pole part 3 are connected by ultrasonic welding, the multi-layer tab sheets and the pole part 3 can be welded together at one time by ultrasonic welding, thereby compared with laser welding, one welding process can be saved, the welding yield can be improved, and the product quality can be improved. Moreover, the equipment and factory buildings can be saved, and the production cost can be reduced.

[0123] In some embodiments of the present application, please refer to FIGS. 6-8 again, the thickness t1 of the pole part 3 at the first part 31 is smaller than the thickness t2 at the second part 32.

[0124] In the above technical solution, the thickness of the first part 31 is relatively thin, which is conducive to the ultrasonic welding of the conductive part 23 and the first part 31. Generally, the step of welding the bus part 103 is after the overall assembly of the battery monomer 102, and the welding of the bus part 103 and the second part 32 can be directly performed from the outside of the battery monomer 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 part 103 and the second part 32 outside the battery monomer 102. The relatively thick second part 32 can easily meet the depth of penetration requirement, thereby improving the connection reliability of the bus part 103 and the pole part 3. In addition, since the thickness of the first part 31 is smaller than the thickness of the second part 32, the pole part 3 is thinned at the first part 31, thereby saving the material, cost and weight of the pole part 3, and improving the energy density of the battery device 100. Of course, the welding method of the bus part 103 and the pole part 3 is not limited to this, for example, it can also be pressure fusion welding, brazing, gluing, etc.

[0125] In some embodiments of the present application, please refer to FIGS. 6-8 again, the pole part 3 is formed with a groove 33 recessed towards the direction away from the accommodating cavity 11, the groove 33 is open towards the accommodating cavity 11, the part of the pole part 3 located on the side of the groove 33 away from the accommodating cavity 11 is the first part 31, and at least part of the conductive part 23 is received in the groove 33 to connect with the first part 31.

[0126] For a clearer introduction, in combination with the orientation description shown in FIG. 6, the pole part 3 is located above the accommodation cavity 11, the groove 33 is recessed upward, the groove 33 is open downward, and the part of the pole part 3 above the groove 33 is the first part 31. Of course, the present application is not limited to this, in actual application, the battery monomer 102 can be placed upside down or flat, so that the pole part 3 is located below or on the side of the accommodation cavity 11.

[0127] In the above technical solution, by setting the groove 33 on the pole part 3 to accommodate at least part of the conductive part 23, the space occupation of the conductive part 23 to the accommodation cavity 11 can be reduced, thereby facilitating the increase of the volume of the active material coating part 21, and further increasing the energy density of the battery monomer 102, and facilitating the accommodation of more electrolyte and gas production, and improving the performance of the battery monomer 102. Moreover, by setting the groove 33 on the pole part 3, the position where the first part 31 is set is thinned, thereby saving the material, cost and weight of the pole part 3. Moreover, the pole part 3 and the conductive part 23 can be connected by ultrasonic welding, thereby facilitating the saving of welding process, improving the welding yield, improving product quality, and saving equipment and factory, and reducing production cost.

[0128] In some embodiments of the present application, please refer to FIG. 6 and FIG. 8 again, the pole part 3 includes a first pole part 3A, the first pole part 3A includes a first conductive piece 34 and a second conductive piece 35 which are different in material, the first conductive piece 34 includes a first sub-part 341 and a second sub-part 342, the first sub-part 341 protrudes toward the direction away from the accommodation cavity 11 relative to the second sub-part 342 to form the groove 33 on the side of the first sub-part 341 close to the accommodation cavity 11, and the first sub-part 341 constitutes the first part 31, the second conductive piece 35 is arranged on the side of the second sub-part 342 away from the accommodation cavity 11 to constitute the second part 32 by stacking the second sub-part 342 and the second conductive piece 35.

[0129] For a clearer introduction, in combination with the orientation description shown in FIG. 6 and FIG. 8, the pole part 3 is located above the accommodation cavity 11, the first sub-part 341 protrudes upward relative to the second sub-part 342, the groove 33 is formed below the first sub-part 341, and the second conductive piece 35 is arranged above the second sub-part 342. Of course, the present application is not limited to this, in actual application, the battery monomer 102 can be placed upside down or flat, so that the pole part 3 is located below or on the side of the accommodation cavity 11.

[0130] Exemplarily, the first pole piece 3A can be used as the pole piece 3 of the negative electrode and is connected with the conductive part 23 of the negative electrode, the conductive part 23 is made of copper material, and the bus piece 103 is made of aluminum material. At this time, the first conductive piece 34 can be made of copper material which is the same as the material of the conductive part 23, and the second conductive piece 35 can be made of aluminum material which is the same as the material of the bus piece 103, thereby facilitating the connection of the pole piece 3 with the conductive part 23 and the bus piece 103.

[0131] Therefore, by setting the first pole piece 3A as a composite pole piece made of different materials, the connection of the pole piece 3 with the conductive part 23 and the bus piece 103 is facilitated. Moreover, the second conductive piece 35 is arranged only at the position where the bus piece 103 needs to be connected, thereby saving the material, weight and cost of the second conductive piece 35. In addition, the second conductive piece 35 is arranged on the side of the first conductive piece 34 away from the accommodating cavity 11, thereby facilitating the connection difficulty of the first conductive piece 34 and the second conductive piece 35 and improving the connection reliability of the first conductive piece 34 and the second conductive piece 35.

[0132] Please refer to FIG. 8 again. In some embodiments of the present application, the thickness of the second sub-part 342 can be smaller than the thickness of the first sub-part 341. Since the second sub-part 342 is used to support the second conductive piece 35 and does not need to be connected with the conductive part 23 or the bus piece 103, the thickness of the second sub-part 342 can be reduced, thereby saving the material, weight and cost of the first conductive piece 34.

[0133] Please refer to FIG. 9, which is a partial cross-sectional view of the pole piece 3 of the battery monomer 102 according to some other embodiments of the present application. In some embodiments of the present application, the pole piece 3 includes a second pole piece 3B, the second pole piece 3B includes a third conductive piece 36 made of the same material, the third conductive piece 36 is partially thinned to form a groove 33, the thinned part of the third conductive piece 36 corresponding to the groove 33 constitutes a first part 31, and the non-thinned part of the third conductive piece 36 offset from the groove 33 constitutes a second part 32. Here, the “third conductive piece 36 made of the same material” means that the material of each part of the third conductive piece 36 is consistent and has no difference.

[0134] Exemplarily, the second pole piece 3B can be used as the pole piece 3 of the positive electrode and is connected with the conductive part 23 of the positive electrode, the conductive part 23 is made of aluminum material, and the bus piece 103 is also made of aluminum material. At this time, the third conductive piece 36 can be made of aluminum material, thereby facilitating the connection of the pole piece 3 with the conductive part 23 and the bus piece 103.

[0135] Thus, by setting the second pole post component 3B to a unified material form, the structure and processing of the second pole post component 3B can be simplified. In addition, the groove 33 is formed by thinning at the position where it needs to be connected with the conductive part 23, which can save the material, weight and cost of the second pole post component 3B, and is conducive to achieving ultrasonic welding with the conductive part 23. And the non-thinned part is connected with the busbar component 103, which is conducive to meeting the penetration requirement when welding the busbar component 103, and meeting the welding requirement of the busbar component 103.

[0136] Please refer to FIG. 7 and FIG. 8 again. In some embodiments of the present application, the pole post component 3 is a long strip structure, the groove 33 is a long strip and the length direction extends along the length direction of the pole post component 3 (for example, 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 post component 3. Thus, the space of the pole post component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole post component 3 can be reduced to a greater extent, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery monomer 102, or to accommodate the electrolyte, thereby improving the energy density or performance of the battery monomer 102.

[0137] Please refer to FIG. 7 and FIG. 8 again. In some embodiments of the present application, the pole post component 3 is a long strip structure, the groove 33 is a long strip and the length direction extends along the length direction of the pole post component 3 (for example, 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 post component 3. Thus, the space of the pole post component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole post component 3 can be reduced to a greater extent, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery monomer 102, or to accommodate the electrolyte, thereby improving the energy density or performance of the battery monomer 102.

[0138] Please refer to FIG. 7 and FIG. 8 again. In some embodiments of the present application, the pole post component 3 is a long strip structure, the groove 33 is a long strip and the length direction extends along the length direction of the pole post component 3 (for example, 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 post component 3. Thus, the space of the pole post component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole post component 3 can be reduced to a greater extent, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery monomer 102, or to accommodate the electrolyte, thereby improving the energy density or performance of the battery monomer 102.

[0139] Exemplarily, the lengthwise 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 component 3. In this way, the space of the pole piece component 3 can be more fully utilized to increase the width of the groove 33, so that the material, weight and cost of the pole piece component 3 can be more greatly reduced, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery cell 102, or to accommodate the electrolyte, so as to improve the energy density or performance of the battery cell 102.

[0140] Please refer to Figs. 7 and 8 again. In some embodiments of the present application, the pole piece component 3 is a long strip structure, the groove 33 is a long strip and extends along the length direction of the pole piece component 3 (e.g. 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 component 3, and the width W1 of the groove 33 exceeds half of the width W2 of the pole piece component 3. In this way, the space of the pole piece component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole piece component 3 can be more greatly reduced, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery cell 102, or to accommodate the electrolyte, so as to improve the energy density or performance of the battery cell 102.

[0141] In some embodiments of the present application, the profile shape of the groove 33 matches the profile shape of the pole piece component 3. That is, on the projection plane perpendicular to the center axis L of the pole piece component 3, the profile shape of the orthographic projection of the pole piece component 3 is completely or substantially the same as the profile shape of the orthographic projection of the groove 33. For example, both are rectangular, or both are elliptical, or both are racetrack-shaped, etc. In this way, the space of the pole piece component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole piece component 3 can be more greatly reduced, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery cell 102, or to accommodate the electrolyte, so as to improve the energy density or performance of the battery cell 102.

[0142] Please refer to Figs. 7 and 8 again. In some embodiments of the present application, on the projection plane perpendicular to the center axis L of the pole piece component 3, the orthographic projection area of the groove 33 is greater than the orthographic projection area of the second part 32. In this way, the space of the pole piece component 3 can be fully utilized to form a larger groove 33, so that the material, weight and cost of the pole piece component 3 can be more greatly reduced, and there is more space to accommodate the conductive part 23, or to accommodate the gas generated by the battery cell 102, or to accommodate the electrolyte, so as to improve the energy density or performance of the battery cell 102.

[0143] Please refer to FIG. 8 and FIG. 9 again, in some embodiments of the present application, the side surface S1 of the first part 31 facing away from the accommodating cavity 11 is flush with the side surface S2 of the second part 32 facing away from the accommodating cavity 11. In this way, the outer surface of the pole piece 3 can be relatively flat, which is conducive to the support of the outer surface of the pole piece 3 to the pressure nozzle used for welding when the pole piece 3 is welded with the busbar piece 103, or in some cases, the outer surface of the pole piece 3 can also be used to support other components. For example, in the example shown in FIG. 8, the outer surface of the first sub-part 341 of the first conductive part 34 is flush with the outer surface of the second conductive part 35, and for example, in the example shown in FIG. 9, the outer surface of the thinned part of the third conductive part 36 is flush with the outer surface of the non-thinned part.

[0144] In some embodiments of the present application, the first part 31 and the conductive part 23 are connected to form a first connecting part 4, please refer to FIG. 10, the pole piece 3 is a long strip structure, and the first connecting part 4 is a long strip structure and extends along the length direction of the pole piece 3 (for example, the fourth direction F1 shown in the figure). In this way, the first connecting part 4 can make full use of the space of the pole piece 3, which is conducive to increasing the connection area of the first part 31 and the conductive part 23, thereby improving the connection reliability of the first part 31 and the conductive part 23, and improving the conductive efficiency of the pole piece 3 and the electrode piece 2, and improving the charging efficiency.

[0145] In some embodiments of the present application, please refer to FIG. 10, the length L3 of the first connecting part 4 exceeds half of the length L2 of the pole piece 3. In this way, the first connecting part 4 can make full use of the space of the pole piece 3, which is conducive to increasing the connection area of the first part 31 and the conductive part 23, thereby improving the connection reliability of the first part 31 and the conductive part 23, and improving the conductive efficiency of the pole piece 3 and the electrode piece 2, and improving the charging efficiency. For example, the welding mark formed by welding the first part 31 and the conductive part 23 is the first connecting part 4, which is a long strip extending along the length direction of the pole piece 3 (for example, the fourth direction F1 shown in the figure), and the length of the welding mark exceeds half of the length of the pole piece 3.

[0146] In some embodiments of the present application, please refer to FIG. 10, the center position of the first connecting part 4 in the width direction falls on the center position in the width direction (for example, the fifth direction F2 shown in the figure) of the pole piece 3, thereby the first connecting part 4 is centrally arranged relative to the pole piece 3, which is conducive to the connection of the conductive part 23 and the pole piece 3, improves the convenience of operation, and facilitates the cooperation of the conductive part 23 and the pole piece 3.

[0147] In some embodiments of the present application, referring to FIG. 10, the length L3 of the first connecting portion 4 exceeds half of the length L2 of the pole piece 3, and the center position of the first connecting portion 4 in the width direction falls on the center position in the width direction (for example, the fifth direction F2 shown in the figure) of the pole piece 3. In this way, the first connecting portion 4 can make more full use of the space of the pole piece 3, which is conducive to increasing the connection area of the first portion 31 and the conductive portion 23, thereby improving the connection reliability of the first portion 31 and the conductive portion 23, and improving the conductive efficiency of the pole piece 3 and the electrode piece 2, and improving the charging efficiency.

[0148] In the embodiments of the present application, when the first portion 31 is connected with the conductive portion 23 to form the first connecting portion 4, the pole is a long strip structure, the first connecting portion 4 is a long strip and the length direction extends along the length direction of the pole piece 3, and the length L3 of the first connecting portion 4 exceeds half of the length L2 of the pole piece 3, the setting position of the second portion 32 can have various cases, for example, the second portion 32 can be arranged at one end of the length direction of the first connecting portion 4, and for example, the second portion 32 can be arranged at one side of the width direction of the first connecting portion 4, so that the second portion 32 can be flexibly arranged to adapt to different forms of the busbar piece 103. For example, some specific embodiments will be given below.

[0149] In some embodiments, referring to FIG. 10, the first portion 31 is connected with the conductive portion 23 to form the first connecting portion 4, the second portion 32 is connected with the busbar piece 103 to form the second connecting portion 5, and the first connecting portion 4 is a long strip and the length direction extends along the length direction of the pole piece 3; the second connecting portion 5 is located at one end of 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 piece 3 is less than the length L3 of the first connecting portion 4. In this way, it can adapt to the busbar piece 103 with relatively small length in the length direction of the pole piece 3, and it is easy to realize the reliable staggering of the busbar piece 103 and the conductive portion 23.

[0150] In some embodiments, referring to FIG. 11, the first portion 31 is connected with the conductive portion 23 to form the first connecting portion 4, the second portion 32 is connected with the busbar piece 103 to form the second connecting portion 5, and the first connecting portion 4 is a long strip and the length direction extends along the length direction of the pole piece 3; the second connecting portion 5 is annular and arranged around the first connecting portion 4. In this way, it can adapt to the busbar piece 103 with relatively large length in the length direction of the pole piece 3, and it is easy to realize the reliable staggering of the busbar piece 103 and the conductive portion 23, and it is easy to increase the area of the second connecting portion 5 and improve the conductive efficiency.

[0151] In some embodiments, referring to FIG. 12, the first portion 31 is connected with the conductive part 23 to form the first connecting part 4, and the second portion 32 is connected with the busbar component 103 to form the second connecting part 5. The first connecting part 4 is long strip-shaped and extends along the length direction of the pole component 3. The second connecting part 5 is long strip-shaped and extends along the length direction of the pole component 3. The second connecting part 5 is located on one side of the first connecting part 4 in the width direction of the pole component 3, i.e., the second connecting part 5 is located on one side of the first connecting part 4 along the width direction of the pole component 3. Thus, the busbar component 103 with relatively large length in the length direction of the pole component 3 can be adapted, and reliable staggering of the busbar component 103 and the conductive part 23 can be easily achieved, and cooperation of the busbar component 103 and the pole component 3 can be easily achieved, and the difficulty of relative positioning of the two is reduced.

[0152] In some embodiments of the present application, referring to FIG. 13, the electrode component 2 includes the tab part 22 connected with the active material coated part 21, the conductive part 23 includes the tab part 22 and the conductive sheet 24 connected with the tab part 22, and the conductive sheet 24 is connected with the first portion 31. Thus, by indirectly connecting the tab part 22 and the pole component 3 through the conductive sheet 24, the length of the tab part 22 can be shortened, the material of the current collector can be saved, and the processing of the current collector is facilitated.

[0153] In some embodiments of the present application, referring to FIG. 14, the electrode component 2 includes the tab part 22 connected with the active material coated part 21, and the tab part 22 constitutes the conductive part 23 to be connected with the first portion 31. Thus, the conductive part 23 is simple in structure, and compared with the scheme that the conductive part 23 is connected with the conductive sheet 24 to constitute the conductive part 23, the operation of connecting the conductive part 23 and the conductive sheet 24 can be omitted, and the production efficiency is improved.

[0154] In some embodiments of the present application, referring to FIG. 14, the tab part 22 includes a shared tab part 22a connected with multiple active material coated parts 21 at the same time. The two ends of the shared tab part 22a are respectively connected with two active material coated parts 21. The part of the shared tab part 22a between the two ends of the shared tab part 22a includes a connecting part 223 connected with the first portion 31. As shown in FIG. 14, the two ends of the shared tab part 22a are respectively a first end 221 and a second end 222. The shared tab part 22a extends from the first end 221 to the second end 222 without being disconnected in the process of extension, i.e., each layer of the shared tab part 22a is a complete sheet body extending from the first end 221 to the second end 222 before welding.

[0155] Thus, by connecting the two active material coating portions 21 through the shared tab portion 22a, after the active material coating portions 21 are wound, the multiple layers of the tab piece at the connection site 223 in the shared tab portion 22a do not need to be unevenly cut, thereby saving materials and processes, reducing costs, and improving production efficiency. Moreover, the two active material coating portions 21 are connected to the pole piece 3 through the shared tab portion 22a, and relative to each active material coating portion 21, a separate tab portion 22 is connected to the pole piece 3, which can improve the production rhythm. Moreover, relative to each active material coating portion 21, the separate tab portion 22b is separately output, and the separate tab portion 22b is laid flat without layering and is separately connected to the pole piece 3, which can save the space occupied by the entire tab portion 22, is conducive to staggering the tab portion 22 and the busbar component 103, and makes the areas of the first connection portion 4 and the second connection portion 5 relatively large.

[0156] In some embodiments of the present application, referring to FIG. 14, the shared tab portion 22a has a pre-connection portion 224 that connects the multiple layers of the tab piece in the shared tab portion 22a together, and each of the two ends of the shared tab portion 22a is provided with a pre-connection portion 224 between the connection site 223. For example, as shown in FIG. 14, at least one pre-connection portion 224 is provided between the first end 221 and the connection site 223, and at least one pre-connection portion 224 is provided between the second end 222 and the connection site 223. Thus, by providing a pre-connection portion 224 between each of the two ends of the shared tab portion 22a and the connection site 223, the connection site 223 is located between the pre-connection portions 224 on both sides, and the multiple layers of the tab piece in the connection site 223 can be gathered together, thereby facilitating the connection operation of the connection site 223 and the pole piece 3.

[0157] For example, the pre-connection portion 224 is a pre-welding mark, that is, the local part of the multiple layers of the tab piece in the shared tab portion 22a is welded together to form the pre-connection portion 224 by welding. Thus, the formation of the pre-connection portion 224 is facilitated, and the welding method is not limited, for example, it can be a combination of ultrasonic welding, ultrasonic pre-welding, and laser welding, resistance welding, pressure fusion welding, brazing, etc. For example, the pre-connection portion 224 is an ultrasonic welding mark, that is, the local part of the multiple layers of the tab piece in the shared tab portion 22a is welded together to form the pre-connection portion 224 by ultrasonic welding, thereby facilitating the operation, having high connection efficiency, and low cost.

[0158] In some embodiments of the present application, referring to FIG. 14, a support 6 is arranged in the space formed between the active material coating portion 21 and the shared tab portion 22a, and the support 6 is used to support the shared tab portion 22a. Thus, the problems such as the scattering redundancy of the multiple layers of the tab piece in the connection site 223 can be improved.

[0159] Exemplarily, the support 6 is an adhesive film pasted on the side of the common tab portion 22a facing the active material coating portion 21. In this way, the support 6 has a simple structure, is easy to set, and can reliably support the common tab portion 22a without causing damage to the active material coating portion 21 and the common tab portion 22a. For example, the support 6 can be a blue film and is pasted on the side surface of the common tab portion 22a facing the active material coating portion 21, thereby playing a role in supporting the common tab portion 22a to improve the problems such as the scattering redundancy of the multi-layer tabs in the connection portion 223.

[0160] In some embodiments of the present application, while the space formed between the active material coating portion 21 and the common tab portion 22a is provided with the support 6 for supporting the common tab portion 22a, the common tab portion 22a is provided with the pre-connection portion 224 connecting the multi-layer tab pieces in the common tab portion 22a together, and the pre-connection portion 224 is provided between each of the two ends of the common tab portion 22a and the connection portion 223. In this way, the problems such as the scattering redundancy of the multi-layer tabs in the connection portion 223 can be improved.

[0161] In some embodiments of the present application, in combination with FIG. 15, the tab portion 22 includes a single tab portion 22b connected to only a single active material coating portion 21, and multiple single tab portions 22b of the same polarity are stacked. Exemplarily, the multiple single tab portions 22b can be first welded together to form an integrated body, and then the integrated body of the multiple single tab portions 22b welded together is welded to the pole member 3; or one single tab portion 22b can be first welded to the pole member 3, and then the remaining single tab portions 22b are welded to the single tab portion 22b to form an integrated body. In this way, since the single tab portions 22b are stacked, the space occupied by the entire tab portion 22 can be saved, which is conducive to staggering the tab portion 22 and the bus member 103, so that the areas of the first connection portion 4 and the second connection portion 5 are relatively large.

[0162] 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 layers of the tab pieces included in the tab portion 22 is small (for example, 20-60 layers), at this time, the common tab portion 22a can be provided to be connected with the two active material coating portions 21, and then the common tab portion 22a is connected with the pole piece component 3. Alternatively, the common tab portion 22a can not be provided to be connected with the two active material coating portions 21, and each active material coating portion 21 can output a single tab portion 22b respectively, at this time, the single tab portions 22b of the same polarity output by the two active material coating portions 21 can be laminated together, and then the laminated tab portions 22 are welded with the pole piece component 3. Since the thickness of the laminated tab portions 22 is not too thick, the tab portions 22 can be easily welded with the pole piece component 3, the welding quality is easy to control, and since the single tab portions 22b are stacked, the space occupied by the tab portions 22 as a whole can be saved, which is conducive to staggering the tab portions 22 and the busbar component 103, so that the areas of the first connecting portion 4 and the second connecting portion 5 are relatively large.

[0163] 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 layers of the tab pieces included in the tab portion 22 is small (for example, 20-60 layers), at this time, the common tab portion 22a can be provided to be connected with the two active material coating portions 21, and then the common tab portion 22a is connected with the pole piece component 3. Alternatively, the common tab portion 22a can not be provided to be connected with the two active material coating portions 21, and each active material coating portion 21 can output a single tab portion 22b respectively, at this time, the single tab portions 22b of the same polarity output by the two active material coating portions 21 can be laminated together, and then the laminated tab portions 22 are welded with the pole piece component 3. Since the thickness of the laminated tab portions 22 is not too thick, the tab portions 22 can be easily welded with the pole piece component 3, the welding quality is easy to control, and since the single tab portions 22b are stacked, the space occupied by the tab portions 22 as a whole can be saved, which is conducive to staggering the tab portions 22 and the busbar component 103, so that the areas of the first connecting portion 4 and the second connecting portion 5 are relatively large.

[0164] In some embodiments of the present application, in combination with FIG. 14, the pole piece component 3 includes a pole body 37, an adapter structure 38, and an insulation structure 39. The adapter structure 38 surrounds the pole body 37, and the adapter structure 38 is connected with the housing component 1. The insulation structure 39 is connected in insulation between the adapter structure 38 and the pole body 37. The conductive portion 23 is connected with the pole body 37. The pole body 37 includes the first portion 31 and the second portion 32.

[0165] Therefore, the pole column component 3 can be flexibly arranged in structure, without affecting the connection with the conductive part 23 in order to meet the connection with the shell component 1, and without affecting the connection with the shell component 1 in order to meet the connection with the conductive part 23, thereby facilitating to improve the connection quality and convenience of the pole column component 3 with the shell component 1, and to improve the connection quality and convenience of the pole column component 3 with the conductive part 23.

[0166] For example, in some embodiments, the pole column body 37 and the adapter structure 38 are both metal materials, the pole column body 37 is welded to be connected with the conductive part 23, and the adapter structure 38 is welded to be connected with the shell component 1. At this time, the relative position of the adapter structure 38 and the shell component 1 can be flexibly arranged, for example, the adapter structure 38 can be arranged on the outside of the shell component 1, or on the inside of the shell component 1, or through the shell component 1, and the like, thereby facilitating flexible design and assembly, and the welding connection of the adapter structure 38 and the shell component 1 facilitates to improve the connection reliability of the shell component 1 and the adapter structure 38.

[0167] In one specific embodiment of the present application, referring to FIG. 13, the edge of the adapter structure 38 is arranged around the mounting hole 12 and overlaps on the side of the shell component 1 away from the accommodation cavity 11, the adapter structure 38 is a metal piece and is welded to be connected with the shell component 1. Therefore, the adapter structure 38 can be relatively easily matched and connected with the shell component 1, and the connection is easy to check, thereby improving the connection reliability.

[0168] In some embodiments of the present application, referring to FIG. 14, the insulation structure 39 includes a sealing structure 391, the sealing structure 391 is arranged around the side of the adapter structure 38 close to the pole column body 37, and the sealing structure 391 is clamped between the adapter structure 38 and the pole column body 37. In the conventional structure, the pole column needs to press on the sealing piece placed on the shell to achieve sealing, but in this sealing mode, in order to ensure the required pre-tightening force for sealing, the pressure applied by the pole column to the shell is large, and when the thickness of the shell is thin, the deformation or damage of the shell is easily caused. In the embodiments of the present application, the sealing structure 391 is arranged at the connection between the pole column body 37 and the adapter structure 38 to play a sealing role, so that the pole column component 3 itself has self-sealing property, and when the pole column component 3 is installed to the shell component 1, the insulation and sealing between the adapter structure 38 and the shell component 1 do not need to be considered, only the reliable whole connection needs to be completed, thus the large force applied by the pole column component 3 to the shell component 1 is not needed, thereby the stress deformation problem of the shell component 1 can be improved, and further, the thickness of the shell component 1 can be reduced, the material cost can be reduced, the weight of the battery monomer 102 can be reduced, and the energy density can be improved.

[0169] In some embodiments of the present application, referring to FIG. 14, the insulation structure 39 comprises an injection structure 392, and the adapter structure 38 and the pole body 37 are integrally connected with the injection structure 392. Thus, the injection structure 392 not only plays an insulation role, but also plays a role of fixedly connecting the pole body 37 and the adapter structure 38, so that the processing and forming of the pole component 3 can be simplified. For example, the pole body 37 and the adapter structure 38 can be first connected to obtain the injection structure 392, and then the adapter structure 38 is bent and the sealing structure 391 is pressed between the pole body 37 and the adapter structure 38, so that rapid assembly can be realized.

[0170] For example, in other embodiments, the insulation structure 39 can not comprise the injection structure 392, but only comprise one or more sealing structures 391. At this time, the adapter structure 38, the sealing structure 391 and the pole body 37 can be fixedly connected by riveting of the adapter structure 38 and the like.

[0171] According to the second aspect of the embodiments of the present application, the embodiments of the present application also provide a battery device 100 comprising the battery cell 102 of any of the above-mentioned schemes and the current collecting component 103 for connecting a plurality of battery cells 102. Thus, since the thickness of the pole component 3 is reduced, the weight and cost of the whole battery device 100 are reduced.

[0172] It is worth noting that the battery device 100 according to the embodiments of the present application can comprise the box 101 or can not comprise the box 101. For example, referring to FIG. 2, the battery device 100 comprises the box 101, the battery cell 102 is a plurality of battery cells and is contained in the box 101, and the bottom of the box 101 is a box bottom plate. The pole component 3 is arranged on the side of the housing component 1 close to the box bottom plate or on the side of the housing component 1 away from the box bottom plate. During use of the battery device 100, for example, during vehicle use, the box bottom plate is at the bottom of the box 101 in the direction of gravity. Thus, when the pole component 3 is arranged on the side of the housing component 1 close to the box bottom plate, it means that the pole component 3 is at the bottom of the housing component 1 in the direction of gravity; and when the pole component 3 is arranged on the side of the housing component 1 away from the box bottom plate, it means that the pole component 3 is at the top of the housing component 1 in the direction of gravity. Thus, the relative position of the pole component 3 and the box bottom plate is not limited, and the orientation of the battery cell 102 and the box 101 can be flexibly arranged.

[0173] When the pole part 3 of the battery monomer 102 is arranged on the side of the housing part 1 facing the bottom plate of the box, the battery monomer 102 is in an inverted state, and the product of pressure relief is sprayed in a direction away from the passenger cabin, which is safer. When the pole part 3 of the battery monomer 102 is arranged on the side of the housing part 1 away from the bottom plate of the box, the battery monomer 102 is in a normal state, and the electrolyte is not easy to leak.

[0174] In some embodiments of the present application, in combination with FIG. 13, the first connecting part 4 and the second connecting part 5 are both within the projection range of the mounting hole 12 in the projection plane perpendicular to the center axis L of the pole part 3. In this way, the mounting hole 12 is not easy to affect the cooperation and connection of the conductive part 23 and the pole part 3, and the connection of the busbar part 103 and the pole part 3 is also not easy to adversely affect the housing part 1.

[0175] According to the third aspect of the embodiments of the present application, the embodiments of the present application also provide a power utilization device, which comprises the battery device 100 of any of the above-mentioned schemes, and the battery device 100 is used to provide power for the power utilization device. The power utilization device can be any of the above-mentioned devices or systems using the battery device 100. Since the performance of the battery device 100 is improved, the working power performance of the power utilization device is also improved.

[0176] Next, a specific embodiment according to the present application is described.

[0177] The battery monomer 102 comprises a housing part 1, an electrode part 2 and a pole part 3. The housing part 1 defines a containing cavity 11 and has a mounting hole 12. The electrode part 2 comprises an active material coated part 21 and a conductive part 23. The active material coated part 21 is contained in the containing cavity 11, and the conductive part 23 is connected to the active material coated part 21. The pole part 3 is arranged at the mounting hole 12 and connected to the housing part 1. The pole part 3 comprises a first part 31 and a second part 32. The first part 31 is ultrasonic welded to the conductive part 23, and the second part 32 is laser welded to the busbar part 103. The pole part 3 is formed with a groove 33 recessed in a direction away from the containing cavity 11. The groove 33 is open in a direction towards the containing cavity 11. The part of the pole part 3 on the side of the groove 33 away from the containing cavity 11 is the first part 31. At least part of the conductive part 23 is received in the groove 33 to be connected to the first part 31. The first part 31 and the second part 32 are different parts of the pole part 3, so that the conductive part 23 and the busbar part 103 are arranged staggered. The thickness of the pole part 3 at the second part 32 is greater than the thickness at the first part 31. For example, in the length direction of the pole part 3, the second part 32 is located on the side of the groove 33, or in the width direction of the pole part 3, the second part 32 is located on the side of the groove 33.

[0178] Thus, by ultrasonic welding the conductive part 23 and the first part 31, compared with the scheme that the conductive part 23 is first ultrasonic pre-welded itself, and then connected with the first part 31 by laser welding, one welding process can be saved, the process is optimized, the welding yield is improved, the problem that the particles formed by welding enter the accommodation cavity 11 is reduced, the performance of the battery monomer 102 is improved, and the equipment and factory building are saved, and the production cost is reduced. And the second part 32 is arranged staggered with the first part 31, which avoids the influence of the ultrasonic welding of the conductive part 23 and the first part 31 on the laser welding of the busbar part 103 and the pole part 3 when the welding seat pit indentation flows down on the outer surface of the first part 31. By thinning the local part of the pole part 3 to form the groove 33, the material, weight and cost of the pole part 3 can be saved, and the conductive part 23 is accommodated in the groove 33, which is conducive to improving the energy density of the battery monomer 102, and conducive to the battery monomer 102 containing more electrolyte and gas production, and improving the performance and life of the battery monomer 102.

[0179] In the embodiment, the electrode part 2 includes the active material coated part 21 and the tab part 22, the two ends of the tab part 22 are respectively connected to two active material coated parts 21, the part of the tab part 22 between the two ends of the tab part 22 includes a connection site 223, the tab part 22 has a pre-connection part 224 connecting multiple tab sheets in the tab part 22 together, the pre-connection part 224 is provided between each of the two ends of the tab part 22 and the connection site 223, the pre-connection part 224 is an ultrasonic welding mark, the connection site 223 is connected to the first part 31, and the space formed between the active material coated part 21 and the tab part 22 is provided with a support 6 for supporting the tab part 22, and the support 6 is a glue film pasted on the side of the tab part 22 facing the active material coated part 21.

[0180] The tab portion 22 includes a shared tab portion 22a connected to the plurality of active material coating portions 21, two ends of the shared tab portion 22a are connected to two active material coating portions 21 respectively, and a connection site 223 of the shared tab portion 22a between the two ends of the shared tab portion 22a is connected to the first portion 31. Thus, the two active material coating portions 21 are connected by the shared tab portion 22a, and after the active material coating portion 21 is wound, the connection site 223 of the shared tab portion 22a does not need to be cut, thereby saving materials and processes, reducing costs, and improving production efficiency. Moreover, the two active material coating portions 21 are connected to the pole piece 3 through the shared tab portion 22a, which is more efficient than connecting each active material coating portion 21 to the pole piece 3 through a separate tab portion 22. In addition, compared with separately outputting a separate tab portion 22b for each active material coating portion 21 and laying out the separate tab portion 22b without stacking and separately connecting the separate tab portion 22b to the pole piece 3, the space occupied by the tab portion 22 as a whole can be saved, which is conducive to staggering the tab portion 22 and the busbar 103, so that the areas of the first connection portion 4 and the second connection portion 5 are relatively large.

[0181] The processing steps of the battery monomer 102 will be briefly introduced below. Referring to FIG. 16A, first, the two active material coating portions 21 are unfolded, and the multiple layers of tab pieces in the center of the shared tab portion 22a are gathered into a stack. Referring to FIGS. 16B and 16C, the position near the root of the shared tab portion 22a is ultrasonically welded by a welding head 401 and a welding seat 402 to obtain two pre-connection portions 224, so as to improve the problem of loose redundancy of the multiple layers of tab pieces in the shared tab portion 22a. Referring to FIG. 16D, the connection site 223 of the shared tab portion 22a between the two pre-connection portions 224 is ultrasonically welded to the pole body 37. Referring to FIG. 16E, a blue film is pasted as a support 6 on the side surface of the tab portion 22 away from the pole body 37. Referring to FIG. 16F, the two active material coating portions 21 are close to each other, and then the shell member 1 is loaded. The pole piece 3 is connected to the shell member 1. Referring to FIG. 16G, the busbar 103 is assembled on the outside of the pole piece 3, avoiding the position of the welding seat mark formed by welding the tab portion 22 on the pole piece 3, and the busbar 103 is welded to the pole piece 3 by laser welding.

[0182] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0183] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A battery cell, wherein, The application relates to a battery cell, comprising: a housing component defining a receiving cavity and having a mounting hole; an electrode component comprising an active material coating part and a conductive part, the active material coating part being received in the receiving cavity, and the conductive part being connected to the active material coating part; a post component provided at the mounting hole and connected to the housing component, the post component comprising a first part and a second part, the first part being connected to the conductive part, and the second part being configured to be connected to a busbar component connecting a plurality of battery cells, the first part and the second part being different parts of the post component so that the conductive part and the busbar component are arranged staggeredly.

2. The battery cell of claim 1, wherein, The first part and the conductive part are ultrasonically welded to form a first connecting part.

3. The battery cell of claim 1 or 2, wherein, The thickness of the post component at the first part is smaller than the thickness of the post component at the second part.

4. The battery cell of any one of claims 1-3, wherein, The post component is provided with a groove recessed towards a direction away from the receiving cavity, the groove being open towards the receiving cavity, and a part of the post component on a side of the groove away from the receiving 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.

5. The battery cell of claim 4, wherein, The post component comprises a first post component, the first post component comprising a first conductive member and a second conductive member made of different materials, the first conductive member comprising a first sub-part and a second sub-part, the first sub-part being protruded towards a direction away from the receiving cavity relative to the second sub-part to form the groove on a side of the first sub-part close to the receiving cavity and to constitute the first part, and the second conductive member being provided on a side of the second sub-part away from the receiving cavity to constitute the second part by superimposition of the second sub-part and the second conductive member.

6. The battery cell of claim 5, wherein, The thickness of the second sub-part is smaller than the thickness of the first sub-part.

7. The battery cell of claim 4, wherein, The post component comprises a second post component, the second post component comprising a third conductive member made of uniform material, and a part of the third conductive member being thinned to form the groove, the thinned part of the third conductive member corresponding to the groove constituting the first part, and a non-thinned part of the third conductive member away from the groove constituting the second part.

8. The battery cell of any one of claims 4-7, wherein, The post component has an elongated structure, the groove has an elongated shape and extends along a length direction of the post component, and the length of the groove is more than half of the length of the post component, and / or the width of the groove is more than half of the width of the post component.

9. The battery cell of any one of claims 4-8, wherein, In a projection plane perpendicular to a central axis of the post component, the area of the orthographic projection of the groove is greater than the area of the orthographic projection of the second part.

10. The battery cell of any one of claims 1-9, wherein, The first part and the conductive part are connected to form a first connecting part, the post component has an elongated structure, and the first connecting part has an elongated shape and extends along a length direction of the post component.

11. The battery cell of claim 10, wherein, The length of the first connecting part is more than half of the length of the post component, and / or the center position of the first connecting part in a width direction falls on the center position of the post component in the width direction.

12. The battery cell of any one of claims 1-11, wherein, A side surface of the first portion, which is away from the accommodation cavity, is flush with a side surface of the second portion, which is away from the accommodation cavity.

13. The battery cell of any one of claims 1-12, wherein, The electrode component includes a tab portion connected to the active material coated portion, and the conductive portion is configured to be connected to the first portion.

14. The battery cell of claim 13, wherein, The tab portion includes a common tab portion connected to a plurality of the active material coated portions, both ends of the common tab portion are connected to two of the active material coated portions, and a connecting portion is included in a portion of the common tab portion between the two ends of the common tab portion, the connecting portion being connected to the first portion.

15. The battery cell of claim 14, wherein, The common tab portion has a pre-connection portion connecting a plurality of layers of tab pieces in the common tab portion together, and the pre-connection portion is provided between each of the two ends of the common tab portion and the connecting portion.

16. The battery cell of claim 15, wherein, The pre-connection portion is an ultrasonic welding mark.

17. The battery cell of any one of claims 14-16, wherein, A support member is provided in a space formed between the active material coated portion and the common tab portion, and the support member is used to support the common tab portion.

18. The battery cell of claim 17, wherein, The support member is an adhesive film attached to a side of the common tab portion facing the active material coated portion.

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

20. The battery cell of any one of claims 1-12, wherein, The electrode component includes a tab portion connected to the active material coated portion, and the conductive portion includes the tab portion and a conductive sheet connected to the tab portion, the conductive sheet being connected to the first portion.

21. The battery cell of any one of claims 1-20, wherein, The pole component includes a pole body, an adapter structure, and an insulation structure, the adapter structure surrounding the pole body and being connected to the housing component, the insulation structure being insulatively connected between the adapter structure and the pole body, the conductive portion being connected to the pole body, and the pole body including the first portion and the second portion.

22. The battery cell of claim 21, wherein, An edge of the adapter structure is arranged around the mounting hole and overlaps a side of the housing component away from the accommodation cavity, the adapter structure being a metal piece and being welded to the housing component.

23. The battery cell of claim 21 or 22, wherein, The insulation structure includes a sealing structure, the sealing structure being annularly arranged on a side of the adapter structure close to the pole body, and the sealing structure being clamped between the adapter structure and the pole body.

24. The battery cell of claim 23, wherein, The insulation structure includes an injection molding structure, and the adapter structure and the pole body are integrally injection molded with the injection molding structure.

25. A battery device, wherein, The battery cell includes: A plurality of battery cells according to any one of claims 1-24, and a busbar component for connecting the plurality of battery cells, the first portion being connected to the conductive portion to form a first connection portion, and the busbar component being connected to the second portion to form a second connection portion.

26. The battery device of claim 25, wherein, The pole component is a long strip structure, the first connection portion is a long strip and extends in a length direction along a length direction of the pole component, the second connection portion is located at one end of the length direction of the first connection portion, and a length of the second connection portion in the length direction of the pole component is less than a length of the first connection portion.

27. The battery device of claim 25, wherein, The pole member is a long strip structure, the first connecting part is a long strip structure and extends along the length direction of the pole member, and the second connecting part is a ring structure and is arranged around the first connecting part.

28. The battery device of claim 25, wherein, The pole member is a long strip structure, the first connecting part is a long strip structure and extends along the length direction of the pole member, and the second connecting part is a long strip structure and extends along the length direction of the pole member, and the second connecting part is located on one side of the first connecting part in the width direction.

29. The battery device of any one of claims 25-28, wherein, The second connecting part is formed by laser welding the second part to the bus member.

30. The battery device of any one of claims 25-29, wherein, In a projection plane perpendicular to the central axis of the pole member, the first connecting part and the second connecting part are both within the projection range of the mounting hole.

31. An electrical device, comprising: A battery device according to any one of claims 25-30.

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