Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery cell comprises a shell, a first electrode assembly and a second electrode assembly. The first electrode assembly and the second electrode assembly are both contained in the shell, the first electrode assembly and the second electrode assembly are arranged in the first direction and electrically connected, and the first electrode assembly and the second electrode assembly are each of a winding structure formed by winding around the axis extending in the first direction. According to the battery monomer with the structure, the size of the single electrode assembly accommodated in the shell in the first direction can be optimized while the length size of the battery monomer in the first direction is increased, and the winding size of the first electrode assembly or the second electrode assembly in the first direction does not need to be increased; therefore, the winding difficulty of the first electrode assembly and the second electrode assembly can be effectively reduced, the assembly difficulty of the battery monomer can be reduced, the manufacturing cost of the battery monomer can be reduced, and the production efficiency of the battery monomer can be improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Batteries, as core components of new energy vehicles, have high requirements in terms of performance. Among them, the battery cell of the battery usually includes a shell and an electrode assembly contained in the shell. In order to improve the energy density and capacitance of the battery cell, the size of the battery cell is getting larger and larger. However, the existing large-sized battery cells are difficult to manufacture and the assembly is cumbersome, which is not conducive to improving the production efficiency of the battery cell. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production efficiency of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a first electrode assembly and a second electrode assembly; the first electrode assembly and the second electrode assembly are both accommodated in the shell, the first electrode assembly and the second electrode assembly are arranged along a first direction and are electrically connected, and the first electrode assembly and the second electrode assembly are both winding structures formed by winding around an axis extending along the first direction.

[0005] In the above technical solution, the shell of the battery cell accommodates a first electrode assembly and a second electrode assembly arranged along a first direction and electrically connected to each other, and the first electrode assembly and the second electrode assembly are both wound structures formed by winding around an axis extending along the first direction, so that the first electrode assembly and the second electrode assembly are structures arranged in the shell along their axial direction. The battery cell adopting this structure can increase the length dimension of the battery cell in the first direction while optimizing the dimension of the single electrode assembly accommodated in the shell in the first direction, without increasing the winding dimension of the first electrode assembly or the second electrode assembly in the first direction, thereby effectively reducing the difficulty of winding the first electrode assembly and the second electrode assembly, and reducing the difficulty of assembling the battery cell, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0006] In some embodiments, the first electrode assembly includes a first body and a first electrode tab, the second electrode assembly includes a second body and a second electrode tab, and the second body and the first body are arranged along the first direction; wherein, along the first direction, the first electrode tab is arranged at one end of the first body facing the second body, and the second electrode tab is arranged at one end of the second body facing the first body, and the second electrode tab is connected to the first electrode tab to electrically connect the first electrode assembly and the second electrode assembly.

[0007] In the above technical solution, the first body of the first electrode assembly and the second body of the second electrode assembly are arranged along the first direction, and the first pole ear of the first electrode assembly is arranged at one end of the first body facing the second body, and correspondingly, the second pole ear of the second electrode assembly is arranged at one end of the second body facing the first body, so that the first pole ear is connected to the second pole ear to achieve electrical connection between the first electrode assembly and the second electrode assembly. The battery cell adopting this structure is convenient for connecting the first electrode assembly and the second electrode assembly, which is beneficial to reducing the difficulty of electrical connection between the first electrode assembly and the second electrode assembly, so as to improve the assembly efficiency of the battery cell.

[0008] In some embodiments, the battery cell further includes a mounting frame; the mounting frame is disposed between the first body and the second body along the first direction, and the mounting frame is configured to separate the first body and the second body.

[0009] In the above technical solution, a mounting frame is provided between the first body and the second body arranged along the first direction, so that the mounting frame can separate the first body and the second body. On the one hand, the mounting frame can play a role in stabilizing the assembly of the first body and the second body, which is beneficial to reduce the stability of the first electrode assembly and the second electrode assembly assembled in the outer shell. On the other hand, it can reduce the phenomenon of the first body and the second body colliding or contacting each other during use.

[0010] In some embodiments, the mounting frame is provided with an avoidance hole, the avoidance hole penetrates the mounting frame along the first direction, and the first pole lug and the second pole lug are both inserted into the avoidance hole.

[0011] In the above technical solution, by providing an avoidance hole on the mounting frame that passes through both sides of the mounting frame along the first direction, and the first pole ear and the second pole ear are both inserted into the avoidance hole, the battery cell adopting this structure can, on the one hand, reduce the difficulty of connecting the first pole ear and the second pole ear, which is beneficial to reduce the obstruction of the mounting frame to the first pole ear and the second pole ear; on the other hand, the mounting frame can also play a certain role in stabilizing and protecting the first pole ear and the second pole ear, which is beneficial to reduce the shaking or damage of the first pole ear and the second pole ear during use, so as to improve the stability and service life of the battery cell.

[0012] In some embodiments, the mounting frame includes a first frame body and a second frame body that are detachably connected to each other, the first frame body and the second frame body are arranged along a second direction, and the first frame body and the second frame body together enclose the avoidance hole, and the second direction is perpendicular to the first direction.

[0013] In the above technical solution, the mounting frame is provided with a first frame body and a second frame body arranged along the second direction. The first frame body and the second frame body are arranged as a detachably connected structure, and the first frame body and the second frame body jointly enclose a avoidance hole for inserting the first pole lug and the second pole lug. The mounting frame with such a structure is convenient for assembling the first pole lug and the second pole lug into the avoidance hole after the first pole lug and the second pole lug are connected to each other, which is conducive to reducing the difficulty of assembling the first pole lug and the second pole lug into the avoidance hole. On the other hand, it is convenient to assemble the mounting frame between the first body and the second body, and it is convenient to maintain the first pole lug and the second pole lug after quickly disassembling and assembling the first frame body and the second frame in the later stage.

[0014] In some embodiments, a first groove is provided on a side of the first frame facing the second frame, and the first groove penetrates the first frame along the first direction; a second groove is provided on a side of the second frame facing the first frame, and the second groove penetrates the second frame along the first direction; the second groove and the first groove enclose the avoidance hole.

[0015] In the above technical solution, a first groove is provided on a side of the first frame body facing the second frame body, and a second groove is provided on a side of the second frame body facing the first frame body, so that after the first frame body and the second frame body are assembled with each other along the second direction, the first groove and the second groove can be jointly enclosed to form an avoidance hole for accommodating the first pole ear and the second pole ear. The structure is simple and easy to implement.

[0016] In some embodiments, a clamping portion is disposed on a side of the first frame body facing the second frame body, and a clamping hole is disposed on a side of the second frame body facing the first frame body, wherein the clamping portion is clamped into the clamping hole.

[0017] In the above technical solution, a snap-in portion is provided on the side of the first frame facing the second frame, and correspondingly, a snap-in hole for the snap-in portion to be inserted into is provided on the side of the second frame facing the first frame, so that a detachable connection between the first frame and the second frame is achieved through the snap-in cooperation between the snap-in portion and the snap-in hole. The structure is simple and easy to assemble.

[0018] In some embodiments, the first pole lug includes a first root portion and a first pole lug portion, the first root portion connects the first main body and the first pole lug portion, the first pole lug portion is inserted into the avoidance hole, and the first pole lug portion is connected to the second pole lug; wherein, along the first direction, a first accommodating groove is provided on the side of the mounting frame facing the first main body, the first accommodating groove is used to accommodate the first root portion, and the avoidance hole passes through the bottom surface of the first accommodating groove.

[0019] In the above technical solution, a first accommodating groove for accommodating the first root of the first pole lug is provided on the side of the mounting frame facing the first main body, and the avoidance hole is a structure that penetrates the bottom surface of the first accommodating groove. Thus, on the one hand, the mounting frame can avoid the first root of the first pole lug to reduce the phenomenon of the mounting frame squeezing and damaging the first pole lug, and on the other hand, it is convenient for the first pole lug portion of the first pole lug to be inserted into the avoidance hole for assembly connection with the second pole lug.

[0020] In some embodiments, along the first direction, the first root portion has a first surface facing away from the first main body, the first pole ear portion is protruded from the first surface, and the first surface is matched with the bottom surface of the first accommodating groove.

[0021] In the above technical solution, the first surface of the first root portion facing the bottom surface of the first accommodating groove is set to a structure that fits with the bottom surface of the first accommodating groove, so that the bottom surface of the first accommodating groove can fit with the first surface of the first root portion, thereby enabling the bottom surface of the first accommodating groove to play a certain shaping and gathering role on the first root portion of the first pole lug, which is beneficial to maintaining the shape of the first root portion of the first pole lug.

[0022] In some embodiments, the second pole lug includes a second root portion and a second pole lug portion, the second root portion connects the second main body and the second pole lug portion, the second pole lug portion is inserted into the avoidance hole, and the second pole lug portion is connected to the first pole lug; wherein, along the first direction, a second accommodating groove is provided on the side of the mounting frame facing the second main body, the second accommodating groove is used to accommodate the second root portion, and the avoidance hole passes through the bottom surface of the second accommodating groove.

[0023] In the above technical solution, a second accommodating groove for accommodating the second root of the second pole lug is provided on the side of the mounting frame facing the second main body, and the avoidance hole is a structure that penetrates the bottom surface of the second accommodating groove. Thus, on the one hand, the mounting frame can avoid the second root of the second pole lug to reduce the phenomenon of the mounting frame squeezing and damaging the second pole lug, and on the other hand, it is convenient for the second pole lug portion of the second pole lug to be inserted into the avoidance hole for assembly connection with the first pole lug.

[0024] In some embodiments, along the first direction, the second root portion has a second surface facing away from the second body, the second pole ear portion is protruded from the second surface, and the second surface is matched with the bottom surface of the second accommodating groove.

[0025] In the above technical solution, the second surface of the second root facing the bottom of the second accommodating groove is set to a structure that fits with the bottom of the second accommodating groove, so that the bottom of the second accommodating groove can fit with the second surface of the second root, so that the bottom of the second accommodating groove can also play a certain shaping and gathering role on the second root of the second pole lug, which is beneficial to maintaining the shape of the second root of the second pole lug.

[0026] In some embodiments, the mounting frame is provided with a through hole, the through hole penetrates the mounting frame along the first direction, and the through hole is configured to allow electrolyte to pass through.

[0027] In the above technical solution, by arranging through holes on the mounting frame that penetrate through both sides of the mounting frame along the first direction, the electrolyte can flow between the first electrode assembly and the second electrode assembly through the through holes, which is beneficial to improving the fluidity of the electrolyte between the first electrode assembly and the second electrode assembly to improve the wetting effect of the first electrode assembly and the second electrode assembly on the one hand, and facilitates the gas generated between the first electrode assembly and the second electrode assembly to flow from the through holes on the other hand.

[0028] In some embodiments, a plurality of the through holes are provided on the mounting frame.

[0029] In the above technical solution, by setting a plurality of through holes on the mounting frame, it is helpful to further improve the fluidity of the electrolyte between the first electrode assembly and the second electrode assembly, so as to further improve the wetting effect of the first electrode assembly and the second electrode assembly, and can further improve the flow effect of the gas generated between the first electrode assembly and the second electrode assembly.

[0030] In some embodiments, a cavity is formed inside the mounting bracket, and the cavity is communicated with the through hole.

[0031] In the above technical solution, a cavity is arranged inside the mounting frame, and the cavity is interconnected with the through hole, that is, the through hole is a structure that penetrates the inner wall surface of the cavity. On the one hand, a mounting frame adopting such a structure can reduce the weight of the mounting frame by setting the cavity, so as to reduce the overall weight of the battery cell, which is beneficial to improve the energy density of the battery cell. On the other hand, the cavity can also play a certain buffering role for the electrolyte, which is beneficial to further improve the wetting effect of the first electrode assembly and the second electrode assembly.

[0032] In some embodiments, the battery cell further includes a connector; the connector connects the mounting bracket, the first body, and the second body.

[0033] In the above technical solution, the battery cell is also provided with a connecting piece for connecting the mounting frame, the first body and the second body, so that the mounting frame, the first body and the second body can be connected as a whole through the connecting piece, which is beneficial to improving the structural stability of the mounting frame arranged between the first body and the second body, thereby reducing the risk of shaking or detachment of the mounting frame between the first body and the second body.

[0034] In some embodiments, the connecting member is bonded to the mounting frame, the first body and the second body.

[0035] In the above technical solution, the connecting member is set as a structure bonded to the mounting frame, the first body and the second body to connect the mounting frame, the first body and the second body as a whole. The battery cell using this structure is beneficial to reduce the difficulty of assembling the connecting member to connect the mounting frame, the first body and the second body, so as to improve the assembly efficiency of the battery cell.

[0036] In some embodiments, the connecting member surrounds the outer sides of the mounting frame, the first body, and the second body around an axis extending along the first direction.

[0037] In the above technical solution, by setting the connecting piece as an annular structure arranged around the mounting frame, the first body and the second body, the connecting piece is covered on the outside of the mounting frame, the first body and the second body, which is beneficial to further improve the structural stability of the connecting piece connecting the mounting frame, the first body and the second body, and further improve the structural stability of the mounting frame arranged between the first body and the second body, so as to reduce the risk of shaking or detachment of the mounting frame between the first body and the second body.

[0038] In some embodiments, the first electrode assembly includes two first pole ears, the two first pole ears have opposite polarities and are both arranged at one end of the first body facing the second body; the second electrode assembly includes two second pole ears, the two second pole ears have opposite polarities and are both arranged at one end of the second body facing the first body; wherein the first pole ears with the same polarity are connected to the second pole ears.

[0039] In the above technical solution, the two first pole ears with opposite polarities of the first electrode assembly are both arranged at the end of the first body facing the second body, and the two second pole ears with opposite polarities of the second electrode assembly are both arranged at the end of the second body facing the first body. The first pole ears are interconnected with the corresponding second pole ears with the same polarity to achieve parallel connection between the first electrode assembly and the second electrode assembly, thereby achieving electrical connection between the first electrode assembly and the second electrode assembly. The structure is simple and easy to assemble.

[0040] In some embodiments, the housing has a wall portion, and along the first direction, the first electrode assembly is located between the wall portion and the second electrode assembly; the battery cell also includes two electrode terminals, both of which are insulated and installed on the wall portion, and the electrode terminals are used to output or input electrical energy of the battery cell; wherein, the first electrode assembly also includes two third pole ears, the two third pole ears have opposite polarities and are both arranged at one end of the first body facing the wall portion along the first direction, and the two third pole ears are respectively connected to the two electrode terminals.

[0041] In the above technical solution, two third pole ears are arranged on one end of the first main body of the first electrode assembly facing the wall along the first direction, and the two third pole ears are correspondingly connected to the two electrode terminals arranged on the wall to realize the input or output of electric energy of the battery cell. After the first electrode assembly and the second electrode assembly are electrically connected to each other, the battery cell adopting this structure only needs to be connected to the electrode terminal through the third pole ear to realize the input or output of electric energy of the battery cell, and there is no need to set up multiple electrode output terminals. Therefore, while increasing the length dimension of the battery cell in the first direction, only two electrode terminals are needed to realize the input or output of electric energy of the battery cell, thereby effectively reducing the difficulty of assembling the battery cell, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0042] In some embodiments, the outer shell includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the first electrode assembly and the second electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion.

[0043] In the above technical solution, by setting the wall portion of the outer shell as an end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal on the end cover, and is convenient for assembling and connecting the electrode terminal with the third pole ear of the first electrode assembly, which is beneficial to reduce the difficulty of assembling the battery cell and improve the production efficiency of the battery cell.

[0044] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and the wall portion, the side wall is arranged around the wall portion, along the first direction, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, the side wall and the wall portion jointly define a accommodating cavity for accommodating the first electrode assembly and the second electrode assembly; the end cover closes the opening.

[0045] In the above technical solution, by setting the wall portion of the shell as a wall of the shell arranged opposite to the end cover in the first direction, the battery cell adopting this structure can make the area of ​​the shell where the electrode terminal is installed away from the end cover, and make there no direct connection relationship between the wall portion and the end cover, thereby alleviating the phenomenon that the force generated when the electrode terminal and other components pull or twist the wall portion acts on the end cover, so as to reduce the risk of connection failure between the end cover and the shell, and further help to reduce the risk of leakage of the battery cell during use.

[0046] In some embodiments, the battery cell further includes an insulating member; the insulating member is wrapped around the outside of the first electrode assembly and the second electrode assembly around an axis extending along the first direction, and the insulating member is configured to insulate and isolate the first electrode assembly and the shell and the second electrode assembly and the shell.

[0047] In the above technical solution, the battery cell is also provided with an insulating part, and the insulating part is coated on the outer sides of the first electrode assembly and the second electrode assembly. On the one hand, the insulating part can separate the first electrode assembly and the outer shell as well as the second electrode assembly and the outer shell, which is beneficial to reduce the risk of short circuit between the first electrode assembly and the outer shell as well as between the second electrode assembly and the outer shell, so as to improve the reliability of the battery cell. On the other hand, the insulating part can further fasten the first electrode assembly and the second electrode assembly, so as to realize the connection of the first electrode assembly and the second electrode assembly arranged along the first direction as a whole, which is beneficial to improve the overall structural stability of the first electrode assembly and the second electrode assembly.

[0048] In some embodiments, the length direction of the shell is consistent with the first direction, and the length of the shell is L, satisfying that L≥200 mm.

[0049] In the above technical solution, the length of the outer shell is set to be greater than or equal to 200 mm to increase the length dimension of the battery cell in the first direction, and while realizing the battery cell having a larger length, the first electrode assembly and the second electrode assembly in the outer shell are set to a structure arranged along the first direction, so that while realizing the length of the outer shell of the battery cell in the first direction being greater than or equal to 200 mm, the size of the single electrode assembly accommodated in the outer shell in the first direction can be optimized, and there is no need to increase the winding size of the first electrode assembly or the second electrode assembly in the first direction to reduce the difficulty of winding the first electrode assembly and the second electrode assembly, and the difficulty of assembling the battery cell can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0050] In some embodiments, the length direction of the shell is consistent with the first direction, and the length of the shell is L, satisfying that L≥250mm.

[0051] In the above technical solution, by further setting the length of the shell to be greater than or equal to 250 mm, the length dimension of the battery cell in the first direction is further increased, so that while achieving the length of the shell of the battery cell in the first direction being greater than or equal to 250 mm, the size of the single electrode assembly accommodated in the shell in the first direction can be optimized. There is no need to increase the winding size of the first electrode assembly or the second electrode assembly in the first direction to reduce the difficulty of winding the first electrode assembly and the second electrode assembly, and the difficulty of assembling the battery cell can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0052] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0053] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0056] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0057] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0058] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0059] Figure 5 A schematic diagram of the structure of a first electrode assembly of a battery cell provided in some embodiments of the present application;

[0060] Figure 6 A schematic diagram of the structure of a second electrode assembly of a battery cell provided in some embodiments of the present application;

[0061] Figure 7 A schematic diagram of the connection between the first electrode assembly and the second electrode assembly of a battery cell provided in some embodiments of the present application;

[0062] Figure 8 A schematic diagram of the structure of a mounting frame for a battery cell provided in some embodiments of the present application;

[0063] Fig. 9 A top view of a mounting frame for a battery cell provided in some embodiments of the present application;

[0064] Fig.10 A cross-sectional view of a mounting frame for a battery cell provided in some embodiments of the present application;

[0065] Fig.11 An exploded view of the structure of a mounting frame for a battery cell provided in some embodiments of the present application;

[0066] Fig.12 A schematic structural diagram of a second frame of a battery cell mounting frame provided in some embodiments of the present application;

[0067] Fig.13 A cross-sectional view of a first electrode assembly of a battery cell provided in some embodiments of the present application;

[0068] Fig.14 A cross-sectional view of a second electrode assembly of a battery cell provided in some embodiments of the present application;

[0069] Fig.15 A schematic diagram of assembling a first electrode assembly, a second electrode assembly and a connecting member provided in some embodiments of the present application;

[0070] Fig.16 Schematic diagram of the assembly of the first electrode assembly, the second electrode assembly and the insulating member provided in some embodiments of the present application.

[0071] Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-end cover; 213-wall; 22-first electrode assembly; 221-first body; 222-first pole ear; 2221-first root; 2221a-first surface; 2222-first pole ear; 223-third pole ear; 23-second electrode assembly; 231-second body; 232-second pole ear; 2321-second root; 2321a-second surface; 2322-second pole ear; 24-electrode terminal; 25-pressure relief mechanism; 26-mounting frame; 261-avoidance hole; 262-first frame; 2621-first groove; 2622-clamping portion; 263-second frame; 2631-second groove; 2632-clamping hole; 264-first accommodating groove; 265-second accommodating groove; 266-through hole; 267-cavity; 27-connector; 28-insulating member; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0074] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0075] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0077] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0078] The term "plurality" used in the present application refers to two or more (including two).

[0079] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0080] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0081] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0082] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0083] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0084] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and its modified compounds, etc.

[0086] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0087] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0088] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0090] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0091] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0092] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0093] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0094] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability can be selected.

[0095] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0096] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0097] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0098] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0099] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0100] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0101] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0102] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0103] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0104] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0105] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0106] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0107] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0108] In some embodiments, the shape of the electrode assembly can be cylindrical or flat, etc.

[0109] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0110] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0111] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0112] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0113] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0114] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0115] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0116] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0117] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters.

[0118] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell. As the demand for the energy density and capacity of the battery cell becomes higher and higher, in the related art, in order to improve the energy density and capacity of the battery cell, the length of the battery cell is enlarged to improve the energy density and capacity of the battery cell. However, when the length of the battery cell is enlarged, the length of the electrode assembly needs to be enlarged accordingly, which makes it difficult to manufacture the wound electrode assembly and inconvenient to assemble. In particular, when the length of the battery cell exceeds 200mm or 250mm, it is extremely difficult to wind the wound electrode assembly, which makes it difficult to manufacture the battery cell and inconvenient to assemble, which is not conducive to optimizing the production rhythm of the battery cell, and further results in low production efficiency of the battery cell and high manufacturing cost.

[0119] Based on the above considerations, in order to solve the problem of low production efficiency and high production cost of battery cells, an embodiment of the present application provides a battery cell, which includes a housing, a first electrode assembly and a second electrode assembly. The first electrode assembly and the second electrode assembly are both accommodated in the housing, the first electrode assembly and the second electrode assembly are arranged along a first direction and electrically connected, and the first electrode assembly and the second electrode assembly are both winding structures formed by winding around an axis extending along the first direction.

[0120] In a battery cell of this structure, a first electrode assembly and a second electrode assembly arranged along a first direction and electrically connected to each other are accommodated in the shell of the battery cell, and both the first electrode assembly and the second electrode assembly are wound structures formed by winding around an axis extending along the first direction, so that the first electrode assembly and the second electrode assembly are structures arranged in the shell along their axial direction. A battery cell adopting this structure can increase the length dimension of the battery cell in the first direction while optimizing the dimension of a single electrode assembly accommodated in the shell in the first direction, without increasing the winding dimension of the first electrode assembly or the second electrode assembly in the first direction, thereby effectively reducing the difficulty of winding the first electrode assembly and the second electrode assembly, and reducing the difficulty of assembling the battery cell, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0121] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of the difficulty in manufacturing the battery cells, thereby improving the production efficiency of the battery cells and reducing the manufacturing cost of the battery cells.

[0122] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0123] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0124] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0125] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0126] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application is as follows. The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0127] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0128] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0129] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0130] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0131] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0132] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the first electrode assembly 22 of the battery cell 20 provided in some embodiments of the present application. Figure 6 This is a schematic diagram of the structure of the second electrode assembly 23 of the battery cell 20 provided in some embodiments of the present application. Figure 7 A schematic diagram of the connection between the first electrode assembly 22 and the second electrode assembly 23 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, a first electrode assembly 22, and a second electrode assembly 23. The first electrode assembly 22 and the second electrode assembly 23 are both accommodated in the housing 21, and the first electrode assembly 22 and the second electrode assembly 23 are arranged along the first direction X and electrically connected, and the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the first direction X.

[0133] The housing 21 may also be used to contain electrolytes, such as electrolytes, etc. The housing 21 may also be made of a variety of materials, such as copper, iron, aluminum, steel or aluminum alloys, etc.

[0134] In some embodiments, the housing 21 may include a shell 211 and an end cap 212, wherein a accommodating cavity is formed inside the shell 211, and the accommodating cavity is used to accommodate the first electrode assembly 22 and the second electrode assembly 23, and the accommodating cavity has an opening 2111, that is, the shell 211 is a hollow structure with an opening 2111 formed at one end, and the end cap 212 covers the opening 2111 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the first electrode assembly 22, the second electrode assembly 23 and the electrolyte.

[0135] When assembling the battery cell 20 , the first electrode assembly 22 and the second electrode assembly 23 may be placed in the shell 211 , and the shell 211 may be filled with electrolyte. The end cap 212 may then be closed on the opening 2111 of the shell 211 to complete the assembly of the battery cell 20 .

[0136] The housing 211 may be in various shapes, such as a rectangular parallelepiped or a prism structure. Of course, the end cap 212 may also have various structures, such as a plate-like structure or a hollow structure with one end open. Figure 4 In the embodiment, the shell 211 is a rectangular parallelepiped structure, and the end cover 212 is a plate-like structure.

[0137] Of course, it is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 may include a shell 211 and two end covers 212. The shell 211 is a hollow structure with openings 2111 on opposite sides. One end cover 212 corresponds to an opening 2111 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the first electrode assembly 22, the second electrode assembly 23 and the electrolyte. That is, the shell 211 is formed with openings 2111 on opposite sides, and the two end covers 212 are respectively covered on both sides of the shell 211 to close the corresponding openings 2111.

[0138] The first electrode assembly 22 and the second electrode assembly 23 are components where electrochemical reactions occur in the battery cell 20. The structure of the first electrode assembly 22 and the structure of the second electrode assembly 23 can be various. For example, the first electrode assembly 22 and the second electrode assembly 23 can be cylindrical or flat.

[0139] The battery cell 20 includes a first electrode assembly 22 and a second electrode assembly 23 , that is, the battery cell 20 is provided with a plurality of electrode assemblies, at least two of which are the first electrode assembly 22 and the second electrode assembly 23 .

[0140] The first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the first direction X, that is, the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding the positive electrode sheet, the separator and the negative electrode sheet, and the winding center axis of the first electrode assembly 22 and the winding center axis of the second electrode assembly 23 both extend along the first direction X, that is, the axial direction of the first electrode assembly 22 and the axial direction of the second electrode assembly 23 are both consistent with the first direction X.

[0141] Exemplarily, the isolation member is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0142] The first electrode assembly 22 and the second electrode assembly 23 are arranged along the first direction X and are electrically connected, that is, the first electrode assembly 22 and the second electrode assembly 23 are structures that overlap along the axial direction of the first electrode assembly 22 or the axial direction of the second electrode assembly 23, and the first electrode assembly 22 and the second electrode assembly 23 are electrically conductive. Optionally, the first electrode assembly 22 and the second electrode assembly 23 can be connected in parallel or in series.

[0143] For example, in Figure 4 In the first direction X, the battery cell 20 only includes one group of first electrode assemblies 22 and one group of second electrode assemblies 23 that are overlapped. Of course, in other embodiments, the battery cell 20 may also include multiple groups of first electrode assemblies 22 that are overlapped on one side of the second electrode assembly 23 along the first direction X, and every two adjacent groups of first electrode assemblies 22 in the first direction X are electrically connected to each other.

[0144] Optionally, the first electrode assembly 22 and the second electrode assembly 23 may be cylindrical structures or flat structures. It should be noted that when the first electrode assembly 22 and the second electrode assembly 23 are flat structures, each group of first electrode assemblies 22 and each group of second electrode assemblies 23 located at the same position in the first direction X may be one or multiple stacked along the thickness direction of the battery cell 20. The thickness direction of the battery cell 20 is perpendicular to the first direction X, and the thickness direction of the battery cell 20 is the second direction Y. For example, in Figure 4In the embodiment, the first electrode assembly 22 and the second electrode assembly 23 are both flat structures, and the battery cell 20 includes two first electrode assemblies 22, and the two first electrode assemblies 22 are stacked along the second direction Y. Correspondingly, the battery cell 20 includes two second electrode assemblies 23, and the two second electrode assemblies 23 are stacked along the second direction Y. That is to say, the battery cell 20 includes a group of first electrode assemblies 22 and a group of second electrode assemblies 23 stacked along the first direction X, and each group of first electrode assemblies 22 includes two first electrode assemblies 22 stacked along the thickness direction of the battery cell 20. Correspondingly, each group of second electrode assemblies 23 includes two second electrode assemblies 23 stacked along the thickness direction of the battery cell 20.

[0145] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include two electrode terminals 24, both of which are insulated and installed on the outer shell 21, and both of which are used to be electrically connected to the first electrode assembly 22 or the second electrode assembly 23 to output or input electrical energy of the battery cell 20, and the two electrode terminals 24 are respectively used to output or input the positive and negative electrodes of the battery cell 20.

[0146] The electrode terminal 24 is insulated and mounted on the housing 21, that is, there is no electrical connection between the electrode terminal 24 and the housing 21. The electrode terminal 24 can be disposed on the end cap 212 of the housing 21, or on the shell 211 of the housing 21. Figure 3 and Figure 4 In the embodiment, the electrode terminal 24 is disposed on the end cover 212 .

[0147] Optionally, the electrode terminal 24 plays a role in outputting or inputting electric energy of the battery cell 20 , and the electrode terminal 24 may be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0148] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may further include a pressure relief mechanism 25 , which is disposed on the housing 21 and is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0149] Optionally, the pressure relief mechanism 25 may be disposed on the end cover 212 of the housing 21, or may be disposed on the shell 211 of the housing 21. Figure 3 and Figure 4 In the embodiment, the pressure relief mechanism 25 is arranged on the end cover 212 .

[0150] Similarly, the pressure relief mechanism 25 and the housing 21 may be an integrally formed structure or a separately arranged structure. Figure 4 In the embodiment, the pressure relief mechanism 25 and the housing 21 are of a split structure, and the pressure relief mechanism 25 can be connected to the housing 21 by welding or the like, and correspondingly, the pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve. Of course, in other embodiments, the pressure relief mechanism 25 and the housing 21 can also be an integrally formed structure, and the pressure relief mechanism 25 is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notch groove is provided.

[0151] The shell 21 of the battery cell 20 accommodates a first electrode assembly 22 and a second electrode assembly 23 arranged along a first direction X and electrically connected to each other, and the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the first direction X, so that the first electrode assembly 22 and the second electrode assembly 23 are structures arranged in the shell 21 along their axial direction. The battery cell 20 adopting this structure can increase the length dimension of the battery cell 20 in the first direction X while optimizing the size of a single electrode assembly accommodated in the shell 21 in the first direction X, without increasing the winding size of the first electrode assembly 22 or the second electrode assembly 23 in the first direction X, thereby effectively reducing the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and reducing the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0152] According to some embodiments of the present application, see Figure 5 , Figure 6 and Figure 7 As shown, the first electrode assembly 22 includes a first body 221 and a first pole ear 222, and the second electrode assembly 23 includes a second body 231 and a second pole ear 232, and the second body 231 and the first body 221 are arranged along the first direction X. Wherein, along the first direction X, the first pole ear 222 is arranged at one end of the first body 221 facing the second body 231, and the second pole ear 232 is arranged at one end of the second body 231 facing the first body 221, and the second pole ear 232 is connected to the first pole ear 222 to electrically connect the first electrode assembly 22 and the second electrode assembly 23.

[0153] Among them, the first main body 221 of the first electrode assembly 22 is the area where the chemical reaction occurs in the first electrode assembly 22 inside the battery cell 20. The first main body 221 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet of opposite polarities.

[0154] The first pole ear 222 is a positive electrode or a negative electrode for electrically connecting to the second pole ear 232 of the second electrode assembly 23. If the first pole ear 222 is used to input or output the positive electrode of the first electrode assembly 22, the first pole ear 222 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the first pole ear 222 is used to output or input the negative electrode of the first electrode assembly 22, the first pole ear 222 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each first electrode assembly 22 has two first pole ears 222, and the two first pole ears 222 are both connected to one end of the first body 221 facing the second electrode assembly 23 in the first direction X. The polarities of the two first pole ears 222 are different, that is, the two first pole ears 222 of each first electrode assembly 22 are respectively a positive electrode and a negative electrode for electrically connecting to the second pole ear 232 of the second electrode assembly 23.

[0155] Similarly, the second main body 231 of the second electrode assembly 23 is the area where the chemical reaction occurs in the second electrode assembly 23 within the battery cell 20. The second main body 231 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet of opposite polarities.

[0156] The second pole ear 232 is a positive electrode or a negative electrode for electrically connecting to the first pole ear 222 of the first electrode assembly 22. If the second pole ear 232 is used to input or output the positive electrode of the second electrode assembly 23, the second pole ear 232 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the second pole ear 232 is used to output or input the negative electrode of the second electrode assembly 23, the second pole ear 232 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each second electrode assembly 23 has two second pole ears 232, and the two second pole ears 232 are both connected to one end of the second body 231 facing the first electrode assembly 22 in the first direction X. The polarities of the two second pole ears 232 are different, that is, the two second pole ears 232 of each second electrode assembly 23 are respectively a positive electrode and a negative electrode for electrically connecting to the first pole ear 222 of the first electrode assembly 22.

[0157] It should be noted that the two first pole ears 222 of the first electrode assembly 22 and the two second pole ears 232 of the second electrode assembly 23 can be the first pole ears 222 and the second pole ears 232 of the same polarity connected correspondingly to realize the parallel connection between the first electrode assembly 22 and the second electrode assembly 23, or the first pole ears 222 and the second pole ears 232 of opposite polarities can be connected correspondingly to realize the series connection between the first electrode assembly 22 and the second electrode assembly 23.

[0158] exist Figure 4 and Figure 7 In the embodiment, the first electrode assembly 22 may further include a third pole ear 223, which is connected to an end of the first body 221 away from the first pole ear 222 in the first direction X, and the third pole ear 223 is located at an end of the first body 221 facing the electrode terminal 24, and the third pole ear 223 is used to be electrically connected to the electrode terminal 24 to output or input electrical energy between the first electrode assembly 22 and the second electrode assembly 23.

[0159] The third pole tab 223 is used to output or input the positive electrode or negative electrode of the first electrode assembly 22. If the third pole tab 223 is used to input or output the positive electrode of the first electrode assembly 22, the third pole tab 223 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the third pole tab 223 is used to output or input the negative electrode of the first electrode assembly 22, the third pole tab 223 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each first electrode assembly 22 has two third pole tabs 223, and the two third pole tabs 223 are both connected to one end of the first body 221 facing the electrode terminal 24 in the first direction X. The polarities of the two third pole tabs 223 are different, and the two third pole tabs 223 are respectively connected to the two electrode terminals 24, that is, the two third pole tabs 223 of each first electrode assembly 22 are respectively used to output the positive electrode and the negative electrode of the first electrode assembly 22.

[0160] By arranging the first main body 221 of the first electrode assembly 22 and the second main body 231 of the second electrode assembly 23 to be arranged along the first direction X, and the first pole ear 222 of the first electrode assembly 22 is arranged at one end of the first main body 221 facing the second main body 231, and correspondingly, the second pole ear 232 of the second electrode assembly 23 is arranged at one end of the second main body 231 facing the first main body 221, so that the first pole ear 222 is connected to the second pole ear 232, the electrical connection between the first electrode assembly 22 and the second electrode assembly 23 can be achieved. The battery cell 20 adopting this structure is convenient for connecting the first electrode assembly 22 and the second electrode assembly 23, which is beneficial to reducing the difficulty of electrical connection between the first electrode assembly 22 and the second electrode assembly 23, so as to improve the assembly efficiency of the battery cell 20.

[0161] According to some embodiments of the present application, referring to Figure 4 and Figure 7 , and please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the mounting frame 26 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 further includes a mounting frame 26, which is disposed between the first body 221 and the second body 231 along the first direction X, and is configured to separate the first body 221 and the second body 231.

[0162] The mounting frame 26 is installed between the first body 221 and the second body 231 to separate and support the first body 221 and the second body 231 . The mounting frame 26 can be made of various materials, such as rubber, silicone or plastic.

[0163] For example, in Figure 4 In the embodiment, one end of the first body 221 close to the second body 231 in the first direction X abuts against the mounting frame 26 , and one end of the second body 231 close to the first body 221 in the first direction X abuts against the mounting frame 26 .

[0164] By setting a mounting frame 26 between the first body 221 and the second body 231 arranged along the first direction X, the mounting frame 26 can separate the first body 221 and the second body 231. On the one hand, the mounting frame 26 can play a role in assembling the first body 221 and the second body 231 stably, which is beneficial to reduce the stability of the first electrode assembly 22 and the second electrode assembly 23 assembled in the outer shell 21. On the other hand, it can reduce the phenomenon of the first body 221 and the second body 231 colliding or contacting each other during use.

[0165] According to some embodiments of the present application, referring to Figure 7 and Figure 8 , and please refer to Fig. 9 , Fig. 9 The top view of the mounting frame 26 of the battery cell 20 provided in some embodiments of the present application. The mounting frame 26 is provided with an escape hole 261 , which penetrates the mounting frame 26 along the first direction X, and the first pole lug 222 and the second pole lug 232 are both inserted into the escape hole 261 .

[0166] The avoidance hole 261 penetrates the mounting frame 26 along the first direction X, that is, the mounting hole is a structure extending along the first direction X, and the mounting hole penetrates the surfaces of the mounting frame 26 on both sides in the first direction X.

[0167] The first pole lug 222 and the second pole lug 232 are both inserted into the avoidance hole 261, that is, at least a portion of the first pole lug 222 and at least a portion of the second pole lug 232 are accommodated in the avoidance hole 261, so that the connection position of the first pole lug 222 and the second pole lug 232 is accommodated in the avoidance hole 261, that is, the first pole lug 222 and the second pole lug 232 can be assembled and connected with each other in the avoidance hole 261.

[0168] It should be noted that in other embodiments, the avoidance hole 261 may not be provided on the mounting frame 26 , and the first pole tab 222 and the second pole tab 232 only need to bypass the mounting frame 26 and then be connected to the outer side of the mounting frame 26 .

[0169] By setting an avoidance hole 261 on the mounting frame 26 that passes through both sides of the mounting frame 26 along the first direction X, and the first pole ear 222 and the second pole ear 232 are both inserted into the avoidance hole 261, the battery cell 20 adopting this structure can, on the one hand, reduce the difficulty of connecting the first pole ear 222 and the second pole ear 232, which is beneficial to reduce the obstruction of the mounting frame 26 to the first pole ear 222 and the second pole ear 232; on the other hand, the mounting frame 26 can also play a certain stabilizing and protective role for the first pole ear 222 and the second pole ear 232, which is beneficial to reduce the shaking or damage of the first pole ear 222 and the second pole ear 232 during use, so as to improve the stability and service life of the battery cell 20.

[0170] According to some embodiments of the present application, referring to Figure 8 and Fig. 9 , and please refer to Fig.10 and Fig.11 , Fig.10 A cross-sectional view of a mounting frame 26 of a battery cell 20 provided in some embodiments of the present application, Fig.11 The structure of the mounting frame 26 of the battery cell 20 provided in some embodiments of the present application is exploded. The mounting frame 26 may include a first frame body 262 and a second frame body 263 that are detachably connected to each other, the first frame body 262 and the second frame body 263 are arranged along the second direction Y, and the first frame body 262 and the second frame body 263 are jointly enclosed to form an avoidance hole 261, and the second direction Y is perpendicular to the first direction X.

[0171] Among them, the mounting frame 26 includes a first frame body 262 and a second frame body 263 that are detachably connected to each other, that is, the mounting frame 26 is composed of a first frame body 262 and a second frame body 263 that are separately arranged and detachably connected to each other. The connection structure between the first frame body 262 and the second frame body 263 can be various. For example, the first frame body 262 and the second frame body 263 can be connected to each other by detachable connection methods such as clamping, bolting, etc.

[0172] The first frame 262 and the second frame 263 are jointly enclosed to form the avoidance hole 261, that is, the avoidance hole 261 is formed on the contact surface where the first frame 262 and the second frame 263 abut against each other, so that the avoidance hole 261 is located between the first frame 262 and the second frame 263, that is, the first frame 262 and the second frame 263 are connected to each other along the second direction Y and then spliced ​​together to form the avoidance hole 261, so as to facilitate the first pole ear 222 and the second pole ear 232 to be connected to each other and then accommodated in the avoidance hole 261.

[0173] The mounting frame 26 is provided with a first frame body 262 and a second frame body 263 arranged along the second direction Y. The first frame body 262 and the second frame body 263 are set as a detachable connected structure, and the first frame body 262 and the second frame body 263 are jointly enclosed to form an avoidance hole 261 for the first pole ear 222 and the second pole ear 232 to be inserted. The mounting frame 26 with such a structure is convenient for assembling the first pole ear 222 and the second pole ear 232 into the avoidance hole 261 after the first pole ear 222 and the second pole ear 232 are connected to each other, which is conducive to reducing the difficulty of assembling the first pole ear 222 and the second pole ear 232 into the avoidance hole 261. On the other hand, it is convenient to assemble the mounting frame 26 between the first body 221 and the second body 231, and it is convenient to maintain the first pole ear 222 and the second pole ear 232 after the first frame body 262 and the second frame body 263 are quickly disassembled and assembled in the later stage.

[0174] In some embodiments, reference Fig. 9 , Fig.10 and Fig.11 , and please refer to Fig.12 , Fig.12 A schematic diagram of the structure of the second frame 263 of the mounting frame 26 of the battery cell 20 provided in some embodiments of the present application. A first groove 2621 is provided on the side of the first frame 262 facing the second frame 263, and the first groove 2621 penetrates the first frame 262 along the first direction X. A second groove 2631 is provided on the side of the second frame 263 facing the first frame 262, and the second groove 2631 penetrates the second frame 263 along the first direction X. The second groove 2631 and the first groove 2621 enclose a avoidance hole 261.

[0175] The first groove 2621 penetrates the first frame 262 along the first direction X, that is, two ends of the first groove 2621 in the first direction X respectively extend to two sides of the first frame 262 in the first direction X. Similarly, the second groove 2631 penetrates the second frame 263 along the first direction X, that is, two ends of the second groove 2631 in the first direction X respectively extend to two sides of the second frame 263 in the first direction X.

[0176] The second groove 2631 and the first groove 2621 are combined to form an avoidance hole 261, that is, the first groove 2621 and the second groove are arranged opposite and facing each other in the second direction Y, so that the first groove 2621 and the second groove 2631 are combined to form an avoidance hole 261 that passes through both sides of the mounting frame 26 along the first direction X after the first frame 262 and the second frame 263 are connected to each other.

[0177] It should be noted that, in other embodiments, the mounting frame 26 may also be other structures. For example, the first frame 262 is provided with a first groove 2621 on the side facing the second frame 263 in the second direction Y, and the second frame 263 is not provided with the second groove 2631. The first groove 2621 and the surface of the second frame 263 facing the first frame 262 are jointly enclosed to form an avoidance hole 261. For another example, the second frame 263 is provided with a second groove 2631 on the side facing the first frame 262 in the second direction Y, and the first frame 262 is not provided with the first groove 262. The second groove 2631 and the surface of the first frame 262 facing the second frame 263 are jointly enclosed to form an avoidance hole 261.

[0178] By setting a first groove 2621 on the side of the first frame 262 facing the second frame 263, and setting a second groove 2631 on the side of the second frame 263 facing the first frame 262, after the first frame 262 and the second frame 263 are assembled with each other along the second direction Y, the first groove 2621 and the second groove 2631 can be jointly enclosed to form an avoidance hole 261 for accommodating the first pole ear 222 and the second pole ear 232. The structure is simple and easy to implement.

[0179] According to some embodiments of the present application, see Fig.11 and Fig.12 As shown, a clamping portion 2622 is disposed on one side of the first frame 262 facing the second frame 263 , and a clamping hole 2632 is disposed on one side of the second frame 263 facing the first frame 262 . The clamping hole 2632 is used for the clamping portion 2622 to be clamped in.

[0180] Among them, the snap-in hole 2632 is used for the snap-in portion 2622 to be snapped in, that is, the snap-in portion 2622 of the first frame 262 is used to snap-fit ​​with the snap-in hole 2632 of the second frame 263 to achieve a detachable connection between the first frame 262 and the second frame 263. Of course, in other embodiments, the first frame 262 and the second frame 263 can also be detachably connected by structures such as screw connections.

[0181] Optionally, the clamping portion 2622 disposed on the first frame 262 and the clamping hole 2632 disposed on the second frame 263 may be one or more. Exemplarily, in the second direction Y, five clamping portions 2622 are disposed on the side of the first frame 262 facing the second frame 263, and the five clamping portions 2622 are arranged at intervals along the third direction Z, the third direction Z is the length direction of the mounting frame 26, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and five clamping holes 2632 are disposed on the side of the second frame 263 facing the first frame 262, and the clamping holes 2632 are disposed one by one with the clamping portions 2622, and each clamping hole 2632 is used for a clamping portion 2622 to be clamped in. Of course, in other embodiments, the clamping portions 2622 disposed on the first frame 262 and the clamping holes 2632 disposed on the second frame 263 may also be two, three, four or six, etc.

[0182] It should be noted that, in some embodiments, the engaging portion 2622 may also be disposed on a side of the second frame 263 facing the first frame 262 , and correspondingly, the engaging hole 2632 is disposed on a side of the first frame 262 facing the second frame 263 .

[0183] By setting a snap-in portion 2622 on the side of the first frame 262 facing the second frame 263, a snap-in hole 2632 for the snap-in portion 2622 to be inserted into is correspondingly set on the side of the second frame 263 facing the first frame 262, so that a detachable connection between the first frame 262 and the second frame 263 is achieved through the snap-in cooperation between the snap-in portion 2622 and the snap-in hole 2632, and the structure is simple and easy to assemble.

[0184] According to some embodiments of the present application, referring to Figure 8 and Fig.10 , and please refer to Fig.13 , Fig.13 A cross-sectional view of the first electrode assembly 22 of the battery cell 20 provided in some embodiments of the present application. The first pole ear 222 includes a first root portion 2221 and a first pole ear portion 2222, the first root portion 2221 connects the first body 221 and the first pole ear portion 2222, the first pole ear portion 2222 is inserted into the avoidance hole 261, and the first pole ear portion 2222 is connected to the second pole ear 232. Along the first direction X, a first accommodating groove 264 is provided on one side of the mounting frame 26 facing the first body 221, the first accommodating groove 264 is used to accommodate the first root portion 2221, and the avoidance hole 261 passes through the bottom surface of the first accommodating groove 264.

[0185] Among them, the first root 2221 of the first pole ear 222 is a smoothed area of ​​the first pole ear 222, the first pole ear portion 2222 of the first pole ear 222 is an area of ​​the first pole ear 222 used to connect with the second pole ear 232 or other components, the first root 2221 is connected to one end of the first body 221 facing the second body 231, and the first pole ear portion 2222 is connected to the side of the first root 2221 away from the first body 221.

[0186] A first accommodating groove 264 is provided on the side of the mounting frame 26 facing the first main body 221, that is, the first accommodating groove 264 is provided on the surface of the mounting frame 26 facing the first main body 221 in the first direction X, so that the first root portion 2221 can be accommodated in the first accommodating groove 264, so that the mounting frame 26 can share part of the space with the first root portion 2221 in the first direction X, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0187] The avoidance hole 261 passes through the bottom surface of the first receiving groove 264 , that is, one end of the avoidance hole 261 close to the first body 221 in the first direction X extends to the bottom surface of the first receiving groove 264 .

[0188] It should be noted that in the embodiment where the mounting frame 26 includes a first frame body 262 and a second frame body 263, see Figure 8 and Fig.10 As shown, a portion of the first receiving groove 264 is disposed on a surface of the first frame 262 facing the first main body 221 , and another portion is disposed on a surface of the second frame 263 facing the first main body 221 .

[0189] By providing a first accommodating groove 264 for accommodating the first root portion 2221 of the first pole lug 222 on the side of the mounting frame 26 facing the first main body 221, and the avoidance hole 261 is a structure that penetrates the bottom surface of the first accommodating groove 264, on the one hand, the mounting frame 26 can avoid the first root portion 2221 of the first pole lug 222 to reduce the phenomenon of the mounting frame 26 squeezing and damaging the first pole lug 222, and on the other hand, it is convenient for the first pole lug portion 2222 of the first pole lug 222 to be inserted into the avoidance hole 261 for assembly connection with the second pole lug 232.

[0190] In some embodiments, see Fig.10 and Fig.13 As shown, along the first direction X, the first root portion 2221 has a first surface 2221 a away from the first body 221 , the first pole ear portion 2222 is protruded from the first surface 2221 a , and the first surface 2221 a matches with the bottom surface of the first receiving groove 264 .

[0191] The first pole ear portion 2222 is protruded from the first surface 2221 a , that is, the first pole ear portion 2222 is connected to the first surface 2221 a of the first root portion 2221 and protrudes from the first surface 2221 a , so that the first pole ear portion 2222 can be connected to the second pole ear 232 .

[0192] The first surface 2221 a matches with the bottom surface of the first receiving groove 264 , that is, the first surface 2221 a of the first root portion 2221 can abut against a portion of the bottom surface of the first receiving groove 264 .

[0193] By setting the first surface 2221a of the first root portion 2221 facing the bottom surface of the first receiving groove 264 to a structure that fits with the bottom surface of the first receiving groove 264, so that the bottom surface of the first receiving groove 264 can fit with the first surface 2221a of the first root portion 2221, the bottom surface of the first receiving groove 264 can also play a certain shaping and gathering role on the first root portion 2221 of the first pole lug 222, which is beneficial to maintaining the shape of the first root portion 2221 of the first pole lug 222.

[0194] According to some embodiments of the present application, referring to Fig.10 , and please refer to Fig.14 , Fig.14 A cross-sectional view of a second electrode assembly 23 of a battery cell 20 provided in some embodiments of the present application. The second pole ear 232 includes a second root portion 2321 and a second pole ear portion 2322, the second root portion 2321 connects the second body 231 and the second pole ear portion 2322, the second pole ear portion 2322 is inserted into the avoidance hole 261, and the second pole ear portion 2322 connects the first pole ear 222. Along the first direction X, a second accommodating groove 265 is provided on one side of the mounting frame 26 facing the second body 231, the second accommodating groove 265 is used to accommodate the second root portion 2321, and the avoidance hole 261 runs through the bottom surface of the second accommodating groove 265.

[0195] Among them, the second root portion 2321 of the second pole ear 232 is a smoothed area of ​​the second pole ear 232, the second pole ear portion 2322 of the second pole ear 232 is an area of ​​the second pole ear 232 used to connect with the first pole ear 222 or other components, the second root portion 2321 is connected to one end of the second body 231 facing the first body 221, and the second pole ear portion 2322 is connected to the side of the second root portion 2321 away from the second body 231.

[0196] A second accommodating groove 265 is provided on the side of the mounting frame 26 facing the second main body 231, that is, the second accommodating groove 265 is provided on the surface of the mounting frame 26 facing the second main body 231 in the first direction X, so that the second root portion 2321 can be accommodated in the second accommodating groove 265, so that the mounting frame 26 can share part of the space with the second root portion 2321 in the first direction X, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0197] The avoidance hole 261 passes through the bottom surface of the second receiving groove 265 , that is, one end of the avoidance hole 261 close to the second body 231 in the first direction X extends to the bottom surface of the second receiving groove 265 .

[0198] It should be noted that in the embodiment where the mounting frame 26 includes a first frame body 262 and a second frame body 263, see Fig.10 As shown, a portion of the second receiving groove 265 is disposed on a surface of the first frame 262 facing the second body 231 , and another portion is disposed on a surface of the second frame 263 facing the second body 231 .

[0199] By arranging a second accommodating groove 265 for accommodating the second root portion 2321 of the second pole lug 232 on the side of the mounting frame 26 facing the second main body 231, and the avoidance hole 261 is a structure that penetrates the bottom surface of the second accommodating groove 265, on the one hand, the mounting frame 26 can avoid the second root portion 2321 of the second pole lug 232 to reduce the phenomenon of the mounting frame 26 squeezing and damaging the second pole lug 232, and on the other hand, it is convenient for the second pole lug portion 2322 of the second pole lug 232 to be inserted into the avoidance hole 261 for assembly connection with the first pole lug 222.

[0200] In some embodiments, see Fig.10 and Fig.14 As shown, along the first direction X, the second root portion 2321 has a second surface 2321 a away from the second body 231 , the second pole ear portion 2322 is protruded from the second surface 2321 a , and the second surface 2321 a is matched with the bottom surface of the second receiving groove 265 .

[0201] The second pole ear portion 2322 is protruded from the second surface 2321 a , that is, the second pole ear portion 2322 is connected to the second surface 2321 a of the second root portion 2321 and protrudes from the second surface 2321 a , so that the second pole ear portion 2322 can be connected to the first pole ear 222 .

[0202] The second surface 2321 a matches with the bottom surface of the second receiving groove 265 , that is, the second surface 2321 a of the second root portion 2321 can abut against a portion of the bottom surface of the second receiving groove 265 .

[0203] By setting the second surface 2321a of the second root portion 2321 facing the bottom surface of the second accommodating groove 265 to a structure that fits with the bottom surface of the second accommodating groove 265, so that the bottom surface of the second accommodating groove 265 can fit with the second surface 2321a of the second root portion 2321, the bottom surface of the second accommodating groove 265 can also play a certain shaping and gathering role on the second root portion 2321 of the second pole lug 232, which is beneficial to maintaining the shape of the second root portion 2321 of the second pole lug 232.

[0204] According to some embodiments of the present application, see Figure 8 and Fig. 9 As shown, the mounting frame 26 is provided with a through hole 266 , which penetrates the mounting frame 26 along the first direction X, and the through hole 266 is configured to allow electrolyte to pass through.

[0205] The through hole 266 penetrates the mounting frame 26 along the first direction X, that is, the through hole 266 is a structure extending along the first direction X, and both ends of the through hole 266 penetrate the surfaces of the mounting hole on both sides in the first direction X respectively.

[0206] By providing a through hole 266 on the mounting frame 26 that passes through both sides of the mounting frame 26 along the first direction X, the electrolyte can flow between the first electrode assembly 22 and the second electrode assembly 23 through the through hole 266, which is beneficial for improving the fluidity of the electrolyte between the first electrode assembly 22 and the second electrode assembly 23 to improve the infiltration effect of the first electrode assembly 22 and the second electrode assembly 23 on the one hand, and facilitates the gas generated between the first electrode assembly 22 and the second electrode assembly 23 to flow from the through hole 266 on the other hand.

[0207] In some embodiments, see Figure 8 , Fig. 9 and Fig.11 As shown, a plurality of through holes 266 are provided on the mounting frame 26 .

[0208] For example, in an embodiment where the mounting frame 26 includes a first frame body 262 and a second frame body 263, a plurality of through holes 266 are provided on the first frame body 262, and the plurality of through holes 266 are arranged at intervals along the third direction Z. Correspondingly, a plurality of through holes 266 are also provided on the second frame body 263, and the plurality of through holes 266 are arranged at intervals along the third direction Z. That is, Fig. 9 In the embodiment, the mounting frame 26 is provided with two rows of through holes 266 arranged along the second direction Y, and each row of through holes 266 includes a plurality of through holes 266 arranged at intervals along the third direction Z. Of course, in other embodiments, the mounting frame 26 may also be provided with one row, three rows, or four rows of through holes 266 arranged along the second direction Y, etc.

[0209] By providing a plurality of through holes 266 on the mounting frame 26, it is helpful to further improve the fluidity of the electrolyte between the first electrode assembly 22 and the second electrode assembly 23, so as to further improve the wetting effect of the first electrode assembly 22 and the second electrode assembly 23, and can further improve the flow effect of the gas generated between the first electrode assembly 22 and the second electrode assembly 23.

[0210] In some embodiments, see Fig.10 and Fig.11 As shown, a cavity 267 is formed inside the mounting bracket 26 , and the cavity 267 is communicated with the through hole 266 .

[0211] The cavity 267 is connected to the through hole 266 , that is, the through hole 266 is a structure extending along the first direction X, and the through hole 266 passes through the cavity wall of the cavity 267 , so that at least part of the projection of the through hole 266 in the first direction X is located in the cavity 267 .

[0212] It should be noted that in the embodiment where the mounting frame 26 includes a first frame body 262 and a second frame body 263, Fig.10 and Fig.11 In the embodiment, part of the cavity 267 is located inside the first frame 262, and the other part is located inside the second frame 263, that is, the cavity 267 passes through the side of the first frame 262 facing the second frame 263 and passes through the side of the second frame 263 facing the first frame 262, so that the first frame 262 and the second frame 263 are together enclosed to form the cavity 267. Exemplarily, two cavities 267 are formed inside the mounting frame 26, and the two cavities 267 are arranged at intervals along the first direction X, and the through hole 266 passes through the two cavities 267 in sequence along the first direction X.

[0213] By setting a cavity 267 inside the mounting frame 26, and the cavity 267 is interconnected with the through hole 266, that is, the through hole 266 is a structure that penetrates the inner wall surface of the cavity 267, the mounting frame 26 adopting this structure can, on the one hand, reduce the weight of the mounting frame 26 by setting the cavity 267, so as to reduce the overall weight of the battery cell 20, which is beneficial to improve the energy density of the battery cell 20; on the other hand, the cavity 267 can also play a certain buffering role for the electrolyte, which is beneficial to further improve the wetting effect of the first electrode assembly 22 and the second electrode assembly 23.

[0214] According to some embodiments of the present application, referring to Figure 4 and Figure 7 , and please refer to Fig.15 , Fig.15The first electrode assembly 22 and the second electrode assembly 23 provided in some embodiments of the present application are schematically assembled with the connector 27. The battery cell 20 may further include a connector 27, which connects the mounting frame 26, the first body 221 and the second body 231.

[0215] Among them, the connecting member 27 is located on the outside of the mounting frame 26, and the connecting member 27 serves to connect the mounting frame 26, the first body 221 and the second body 231. Optionally, the structure of the connecting member 27 connecting the mounting frame 26, the first body 221 and the second body 231 can be various, such as bonding, hot melt connection, etc.

[0216] The battery cell 20 is also provided with a connecting piece 27 connecting the mounting frame 26, the first main body 221 and the second main body 231, so that the mounting frame 26, the first main body 221 and the second main body 231 can be connected as a whole through the connecting piece 27, which is beneficial to improving the structural stability of the mounting frame 26 set between the first main body 221 and the second main body 231, thereby reducing the risk of the mounting frame 26 shaking or detaching between the first main body 221 and the second main body 231.

[0217] In some embodiments, the connector 27 is bonded to the mounting bracket 26 , the first body 221 , and the second body 231 .

[0218] Optionally, the connecting member 27 is bonded to the outside of the mounting frame 26, the first body 221 and the second body 231. The connecting member 27 may be adhesive paper or tape, etc. Of course, the connecting member 27 may also be an insulating film provided with an adhesive layer, etc. The adhesive layer may be glue or hot melt adhesive, etc. The material of the connecting member 27 may be rubber, silicone or plastic, etc.

[0219] By setting the connecting member 27 as a structure bonded to the mounting frame 26, the first body 221 and the second body 231, the mounting frame 26, the first body 221 and the second body 231 are connected as a whole. The battery cell 20 adopting this structure is conducive to reducing the assembly difficulty of the connecting member 27 connecting the mounting frame 26, the first body 221 and the second body 231, so as to improve the assembly efficiency of the battery cell 20.

[0220] In some embodiments, see Fig.15 As shown, the connecting member 27 surrounds the outer sides of the mounting frame 26, the first body 221 and the second body 231 around an axis extending along the first direction X. That is, the connecting member 27 is an annular structure extending along the circumference of the mounting frame 26, so that the connecting member 27 is covered on the outer sides of the mounting frame 26, the first body 221 and the second body 231, and the side of the connecting member 27 facing the mounting frame 26 is bonded to the outer surfaces of the mounting frame 26, the first body 221 and the second body 231.

[0221] By setting the connecting member 27 as an annular structure arranged around the mounting frame 26, the first body 221 and the second body 231, the connecting member 27 is covered on the outer side of the mounting frame 26, the first body 221 and the second body 231, which is beneficial to further improve the structural stability of the connecting member 27 connecting the mounting frame 26, the first body 221 and the second body 231, and further improve the structural stability of the mounting frame 26 set between the first body 221 and the second body 231, so as to reduce the risk of the mounting frame 26 shaking or detaching between the first body 221 and the second body 231.

[0222] According to some embodiments of the present application, see Figure 5 , Figure 6 and Figure 7 As shown, the first electrode assembly 22 includes two first pole ears 222, the two first pole ears 222 have opposite polarities and are both arranged at one end of the first body 221 facing the second body 231. The second electrode assembly 23 includes two second pole ears 232, the two second pole ears 232 have opposite polarities and are both arranged at one end of the second body 231 facing the first body 221. The first pole ears 222 and the second pole ears 232 with the same polarity are connected.

[0223] The polarities of the two first electrode tabs 222 are opposite, that is, the two first electrode tabs 222 output or input the positive electrode and the negative electrode of the first electrode assembly 22 respectively.

[0224] For example, in Figure 7 In the embodiment, the two first pole tabs 222 are arranged at intervals along the third direction Z. It should be noted that in the embodiment where the battery cell 20 is provided with a mounting frame 26 and the mounting frame 26 is provided with an avoidance hole 261, Figure 8 and Fig. 9 As shown, two avoidance holes 261 are arranged on the mounting hole, and the two avoidance holes 261 are arranged at intervals along the third direction Z. The avoidance holes 261 are arranged one-to-one with the first pole lugs 222, and each avoidance hole 261 is used for inserting a first pole lug 222.

[0225] The polarities of the two second electrode tabs 232 are opposite, that is, the two second electrode tabs 232 output or input the positive electrode and the negative electrode of the second electrode assembly 23 respectively.

[0226] For example, in Figure 7 In the embodiment, the two second pole tabs 232 are arranged at intervals along the third direction Z. It should be noted that in the embodiment where the battery cell 20 is provided with a mounting frame 26 and the mounting frame 26 is provided with an avoidance hole 261, Figure 8 and Fig. 9As shown, two avoidance holes 261 are arranged on the mounting hole, and the two avoidance holes 261 are arranged at intervals along the third direction Z. The avoidance holes 261 are arranged one-to-one correspondingly to the second pole lugs 232, and each avoidance hole 261 is used for inserting a second pole lug 232.

[0227] The first pole ear 222 and the second pole ear 232 of the same polarity are connected, that is, the first pole ear 222 and the second pole ear 232 of the same output or input positive pole are connected to each other, and the first pole ear 222 and the second pole ear 232 of the same output or input negative pole are connected to each other to achieve parallel electrical connection between the first electrode assembly 22 and the second electrode assembly 23.

[0228] The two first pole ears 222 with opposite polarities of the first electrode assembly 22 are both arranged at one end of the first body 221 facing the second body 231, and the two second pole ears 232 with opposite polarities of the second electrode assembly 23 are both arranged at one end of the second body 231 facing the first body 221. The first pole ears 222 are interconnected with the corresponding second pole ears 232 with the same polarity to achieve parallel connection between the first electrode assembly 22 and the second electrode assembly 23, thereby achieving electrical connection between the first electrode assembly 22 and the second electrode assembly 23. The structure is simple and easy to assemble.

[0229] In some embodiments, see Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, the housing 21 has a wall portion 213, and the first electrode assembly 22 is located between the wall portion 213 and the second electrode assembly 23 along the first direction X. The battery cell 20 also includes two electrode terminals 24, both of which are insulated and installed on the wall portion 213, and the electrode terminals 24 are used to output or input electrical energy of the battery cell 20. The first electrode assembly 22 also includes two third pole ears 223, the two third pole ears 223 have opposite polarities and are both arranged at one end of the first body 221 facing the wall portion 213 along the first direction X, and the two third pole ears 223 are respectively connected to the two electrode terminals 24.

[0230] Among them, the polarities of the two third pole ears 223 are opposite, that is, the two third pole ears 223 output or input the positive and negative poles of the first electrode assembly 22 respectively, so that the two third pole ears 223 can output or input the electrical energy of the battery cell 20 after being connected to the two electrode terminals 24 respectively.

[0231] Optionally, there may be multiple connection structures between the third pole tab 223 and the electrode terminal 24. The third pole tab 223 and the electrode terminal 24 may be directly connected, for example, the third pole tab 223 and the electrode terminal 24 are welded or abutted against each other, etc. Of course, the third pole tab 223 and the electrode terminal 24 may also be indirectly connected, for example, the third pole tab 223 and the current collecting component are welded or abutted against each other and then welded or abutted against each other with the electrode terminal 24, etc.

[0232] It should be noted that the wall portion 213 for mounting the electrode terminal 24 may be the end cover 212 of the housing 21 or a wall of the housing 211. Figure 3 and Figure 4 In the figure, the wall portion 213 is the end cover 212 of the outer shell 21. Of course, in some embodiments, the wall portion 213 can also be the bottom wall of the shell 211 of the outer shell 21 and the end cover 212 arranged opposite to each other or the side wall of the shell 211 of the outer shell 21 and the end cover 212 connected and adjacent to each other.

[0233] By arranging two third pole ears 223 on one end of the first main body 221 of the first electrode assembly 22 facing the wall portion 213 along the first direction X, and the two third pole ears 223 are correspondingly connected to the two electrode terminals 24 arranged on the wall portion 213, so as to realize the input or output of electric energy of the battery cell 20. After the first electrode assembly 22 and the second electrode assembly 23 are electrically connected to each other, the battery cell 20 adopting this structure only needs to be connected to the electrode terminal 24 through the third pole ear 223 to realize the input or output of electric energy of the battery cell 20, and there is no need to set up multiple electrode output terminals. Therefore, while increasing the length dimension of the battery cell 20 in the first direction X, only two electrode terminals 24 are needed to realize the input or output of electric energy of the battery cell 20, thereby effectively reducing the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0234] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 21 may include a shell 211 and an end cap 212. The shell 211 has an accommodating cavity with an opening 2111 formed inside, and the accommodating cavity is used to accommodate the first electrode assembly 22 and the second electrode assembly 23. The end cap 212 closes the opening 2111 and is a wall portion 213.

[0235] The end cover 212 is a wall portion 213 , that is, the electrode terminal 24 is mounted on the end cover 212 , and the third electrode tab 223 of the first electrode assembly 22 is disposed at one end of the first body 221 facing the end cover 212 in the first direction X.

[0236] By setting the wall portion 213 of the outer shell 21 as the end cover 212 of the outer shell 21 for closing the opening 2111 of the shell 211, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 24 on the end cover 212, and convenient for assembling and connecting the electrode terminal 24 with the third pole ear 223 of the first electrode assembly 22, which is beneficial to reduce the assembly difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0237] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, the housing 21 may include a shell 211 and an end cap 212. The shell 211 includes an integrally formed side wall and a wall portion 213. The side wall is arranged around the wall portion 213. Along the first direction X, one end of the side wall is connected to the wall portion 213, and the other end is enclosed to form an opening 2111. The side wall and the wall portion 213 jointly define a receiving cavity for accommodating the first electrode assembly 22 and the second electrode assembly 23. The end cap 212 closes the opening 2111. In other words, the wall portion 213 is the bottom wall of the shell 211 arranged opposite to the end cap 212 in the first direction X, that is, the electrode terminal 24 is installed on the bottom wall of the shell 211, and the third pole ear 223 of the first electrode assembly 22 is arranged at one end of the first body 221 facing the bottom wall of the shell 211 in the first direction X.

[0238] The shell 211 includes an integrally formed side wall and wall portion 213 , that is, the shell 211 is manufactured by an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding, that is, the side wall and wall portion 213 of the shell 211 are an integral structure.

[0239] By setting the wall portion 213 of the outer shell 21 as a wall of the shell 211 that is arranged opposite to the end cover 212 in the first direction X, the battery cell 20 adopting this structure can make the area of ​​the outer shell 21 where the electrode terminal 24 is installed away from the end cover 212, and make there be no direct connection relationship between the wall portion 213 and the end cover 212, thereby alleviating the phenomenon that the force generated when the electrode terminal 24 and other components pull or twist the wall portion 213 acts on the end cover 212, thereby reducing the risk of connection failure between the end cover 212 and the shell 211, and further helping to reduce the risk of leakage of the battery cell 20 during use.

[0240] According to some embodiments of the present application, referring to Figure 4 , and please refer to Fig.16 , Fig.16Schematic diagram of the assembly of the first electrode assembly 22 and the second electrode assembly 23 and the insulating member 28 provided in some embodiments of the present application. The battery cell 20 may further include an insulating member 28. The insulating member 28 is wrapped around the axis extending along the first direction X and is wrapped around the outer side of the first electrode assembly 22 and the second electrode assembly 23. The insulating member 28 is configured to insulate and isolate the first electrode assembly 22 and the housing 21 and the second electrode assembly 23 and the housing 21.

[0241] Among them, the insulating member 28 is wrapped around the outer side of the first electrode assembly 22 and the second electrode assembly 23 around the axis extending along the first direction X, that is, the insulating member 28 is arranged around the outer side of the first electrode assembly 22 and the second electrode assembly 23 along the circumference of the first electrode assembly 22 and the second electrode assembly 23, so that the first electrode assembly 22 and the second electrode assembly 23 are both located on the inner side of the insulating member 28, so that the insulating member 28 is located between the outer shell 21 and the first electrode assembly 22 and between the outer shell 21 and the second electrode assembly 23.

[0242] Exemplarily, the insulating member 28 may be made of various materials, for example, the insulating member 28 may be made of rubber, silicone or plastic.

[0243] In some embodiments, an adhesive layer may be provided on the side of the insulating member 28 facing the first electrode assembly 22 or the second electrode assembly 23 so that the insulating member 28 can be bonded to the outer surface of the first electrode assembly 22 or the second electrode assembly 23. The adhesive layer may be glue or double-sided tape, etc.

[0244] The battery cell 20 is also provided with an insulating member 28, and the insulating member 28 is coated on the outer sides of the first electrode assembly 22 and the second electrode assembly 23. On the one hand, the insulating member 28 can separate the first electrode assembly 22 and the outer shell 21 as well as the second electrode assembly 23 and the outer shell 21, which is beneficial to reduce the risk of short circuit between the first electrode assembly 22 and the outer shell 21 and between the second electrode assembly 23 and the outer shell 21, so as to improve the reliability of the battery cell 20. On the other hand, the insulating member 28 can further fasten the first electrode assembly 22 and the second electrode assembly 23, so as to realize the connection of the first electrode assembly 22 and the second electrode assembly 23 arranged along the first direction X as a whole, which is beneficial to improve the overall structural stability of the first electrode assembly 22 and the second electrode assembly 23.

[0245] According to some embodiments of the present application, see Figure 3 As shown, the length direction of the shell 21 is consistent with the first direction X, and the length of the shell 21 is L, satisfying that L≥200 mm.

[0246] The first direction X is the length direction of the housing 21 and is also the height direction of the battery cell 20 .

[0247] By setting the length of the outer shell 21 to be greater than or equal to 200 mm, the length dimension of the battery cell 20 in the first direction X is increased, and while realizing the battery cell 20 to be of a larger length, the first electrode assembly 22 and the second electrode assembly 23 in the outer shell 21 are set to a structure arranged along the first direction X, so that while realizing the length of the outer shell 21 of the battery cell 20 in the first direction X to be greater than or equal to 200 mm, the dimension of the single electrode assembly accommodated in the outer shell 21 in the first direction X can be optimized, and there is no need to increase the winding dimension of the first electrode assembly 22 or the second electrode assembly 23 in the first direction X, so as to reduce the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and can reduce the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0248] In some embodiments, please see Figure 3 As shown, the length direction of the shell 21 is consistent with the first direction X, and the length of the shell 21 is L, satisfying that L≥250 mm.

[0249] By further setting the length of the outer shell 21 to be greater than or equal to 250 mm, the length dimension of the battery cell 20 in the first direction X can be further increased, so that while the length of the outer shell 21 of the battery cell 20 in the first direction X is greater than or equal to 250 mm, the dimension of the single electrode assembly accommodated in the outer shell 21 in the first direction X can be optimized. There is no need to increase the winding dimension of the first electrode assembly 22 or the second electrode assembly 23 in the first direction X to reduce the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and the difficulty of assembling the battery cell 20 can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0250] According to some embodiments of the present application, the present application further provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above schemes.

[0251] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0252] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0253] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0254] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0255] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0256] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0257] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0258] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0259] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0260] According to some embodiments of the present application, see Figures 3 to 16As shown, the present application provides a battery cell 20, which includes a shell 21, two electrode terminals 24, a first electrode assembly 22, a second electrode assembly 23, a mounting frame 26, a connector 27 and an insulating member 28. The shell 21 has a wall portion 213, the thickness direction of the wall portion 213 is the first direction X, the length direction of the shell 21 is consistent with the first direction X, the length of the shell 21 is L, and L≥250mm is satisfied. The shell 21 includes a shell 211 and an end cover 212, the interior of the shell 211 forms a receiving cavity with an opening 2111, the end cover 212 closes the opening 2111, and the end cover 212 is a wall portion 213. The two electrode terminals 24 are both insulated and mounted on the wall portion 213, and the two electrode terminals 24 are used to output or input electrical energy of the battery cell 20. The first electrode assembly 22 and the second electrode assembly 23 are both accommodated in the accommodation cavity, the first electrode assembly 22 and the second electrode assembly 23 are arranged along the first direction X and are electrically connected, the first electrode assembly 22 is located between the wall portion 213 and the second electrode assembly 23, and the first electrode assembly 22 and the second electrode assembly 23 are both winding structures formed by winding around an axis extending along the first direction X. The first electrode assembly 22 includes a first body 221, two first pole tabs 222 and two third pole tabs 223, and the second electrode assembly 23 includes a second body 231 and two second pole tabs 232, and the second body 231 and the first body 221 are arranged along the first direction X. Along the first direction X, the two first pole tabs 222 have opposite polarities and are both arranged at one end of the first body 221 facing the second body 231, the two third pole tabs 223 have opposite polarities and are both arranged at one end of the first body 221 facing the wall 213, the two second pole tabs 232 have opposite polarities and are both arranged at one end of the second body 231 facing the first body 221, the first pole tab 222 with the same polarity is connected to the second pole tab 232 to electrically connect the first electrode assembly 22 and the second electrode assembly 23, and the two third pole tabs 223 are respectively connected to the two electrode terminals 24. The mounting frame 26 is arranged between the first body 221 and the second body 231 along the first direction X, and the mounting frame 26 is configured to separate the first body 221 and the second body 231. The mounting frame 26 is provided with an avoidance hole 261, and the avoidance hole 261 penetrates the mounting frame 26 along the first direction X, and the first pole tab 222 and the second pole tab 232 are both inserted into the avoidance hole 261. The mounting frame 26 includes a first frame body 262 and a second frame body 263 that are detachably connected to each other. The first frame body 262 and the second frame body 263 are arranged along a second direction Y, and the first frame body 262 and the second frame body 263 together enclose a avoidance hole 261. The second direction Y is perpendicular to the first direction X.A first groove 2621 is provided on one side of the first frame 262 facing the second frame 263, and the first groove 2621 penetrates the first frame 262 along the first direction X. A second groove 2631 is provided on one side of the second frame 263 facing the first frame 262, and the second groove 2631 penetrates the second frame 263 along the first direction X. The second groove 2631 and the first groove 2621 enclose a avoidance hole 261. A clamping portion 2622 is provided on one side of the first frame 262 facing the second frame 263, and a clamping hole 2632 is provided on one side of the second frame 263 facing the first frame 262, and the clamping hole 2632 is used for the clamping portion 2622 to be clamped. The first pole lug 222 includes a first root portion 2221 and a first pole lug portion 2222. The first root portion 2221 connects the first body 221 and the first pole lug portion 2222. The first pole lug portion 2222 is inserted into the avoidance hole 261, and the first pole lug portion 2222 is connected to the second pole lug 232. Along the first direction X, a first receiving groove 264 is provided on the side of the mounting frame 26 facing the first body 221. The first receiving groove 264 is used to receive the first root portion 2221. The avoidance hole 261 passes through the bottom surface of the first receiving groove 264. The first root portion 2221 has a first surface 2221a facing away from the first body 221. The first pole lug portion 2222 is protruding from the first surface 2221a. The first surface 2221a matches the bottom surface of the first receiving groove 264. The second pole lug 232 includes a second root portion 2321 and a second pole lug portion 2322. The second root portion 2321 connects the second body 231 and the second pole lug portion 2322. The second pole lug portion 2322 is inserted into the avoidance hole 261, and the second pole lug portion 2322 connects the first pole lug 222. Along the first direction X, a second receiving groove 265 is provided on the side of the mounting frame 26 facing the second body 231. The second receiving groove 265 is used to receive the second root portion 2321. The avoidance hole 261 passes through the bottom surface of the second receiving groove 265. The second root portion 2321 has a second surface 2321a facing away from the second body 231. The second pole lug portion 2322 is protruding from the second surface 2321a. The second surface 2321a matches the bottom surface of the second receiving groove 265. The mounting frame 26 is provided with a plurality of through holes 266, which penetrate the mounting frame 26 along the first direction X, and the through holes 266 are configured to allow electrolyte to pass through. A cavity 267 is formed inside the mounting frame 26, and the cavity 267 is connected to the through hole 266. The connecting member 27 surrounds the outer side of the mounting frame 26, the first body 221 and the second body 231 around the axis extending along the first direction X, and the connecting member 27 is bonded to the mounting frame 26, the first body 221 and the second body 231. The insulating member 28 is coated on the outer side of the first electrode assembly 22 and the second electrode assembly 23 around the axis extending along the first direction X, and the insulating member 28 is configured to insulate and isolate the first electrode assembly 22 and the housing 21 and the second electrode assembly 23 and the housing 21.

[0261] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0262] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: shell; The first electrode assembly and the second electrode assembly are both accommodated in the shell, the first electrode assembly and the second electrode assembly are arranged along a first direction and are electrically connected, and the first electrode assembly and the second electrode assembly are both winding structures formed by winding around an axis extending along the first direction.

2. The battery cell according to claim 1, characterized in that: The first electrode assembly includes a first body and a first electrode tab, the second electrode assembly includes a second body and a second electrode tab, and the second body and the first body are arranged along the first direction; Among them, along the first direction, the first pole ear is arranged at one end of the first body facing the second body, and the second pole ear is arranged at one end of the second body facing the first body, and the second pole ear is connected to the first pole ear to electrically connect the first electrode assembly and the second electrode assembly.

3. The battery cell according to claim 2, characterized in that: The battery cell further comprises: The mounting frame is disposed between the first body and the second body along the first direction, and the mounting frame is configured to separate the first body and the second body.

4. The battery cell according to claim 3, characterized in that: The mounting frame is provided with an avoidance hole, the avoidance hole penetrates the mounting frame along the first direction, and the first pole lug and the second pole lug are both inserted into the avoidance hole.

5. The battery cell according to claim 4, characterized in that: The mounting frame includes a first frame body and a second frame body that are detachably connected to each other, the first frame body and the second frame body are arranged along a second direction, and the first frame body and the second frame body jointly enclose the avoidance hole, and the second direction is perpendicular to the first direction.

6. The battery cell according to claim 5, characterized in that: A first groove is provided on the side of the first frame facing the second frame, and the first groove penetrates the first frame along the first direction. A second groove is provided on the side of the second frame facing the first frame, and the second groove penetrates the second frame along the first direction. The second groove and the first groove enclose the avoidance hole.

7. The battery cell according to claim 5, characterized in that: A clamping portion is disposed on a side of the first frame body facing the second frame body, and a clamping hole is disposed on a side of the second frame body facing the first frame body, wherein the clamping portion is clamped into the clamping hole.

8. The battery cell according to claim 4, characterized in that: The first pole lug includes a first root portion and a first pole lug portion, the first root portion connects the first body and the first pole lug portion, the first pole lug portion is inserted into the avoidance hole, and the first pole lug portion is connected to the second pole lug; Wherein, along the first direction, a first accommodating groove is provided on the side of the mounting frame facing the first main body, the first accommodating groove is used to accommodate the first root portion, and the avoidance hole passes through the bottom surface of the first accommodating groove.

9. The battery cell according to claim 8, characterized in that: Along the first direction, the first root portion has a first surface away from the first main body, the first pole ear portion is protruded from the first surface, and the first surface is matched with the bottom surface of the first accommodating groove.

10. The battery cell according to claim 4, characterized in that: The second pole lug includes a second root portion and a second pole lug portion, the second root portion connects the second body and the second pole lug portion, the second pole lug portion is inserted into the avoidance hole, and the second pole lug portion is connected to the first pole lug; Wherein, along the first direction, a second accommodating groove is provided on the side of the mounting frame facing the second main body, the second accommodating groove is used to accommodate the second root portion, and the avoidance hole passes through the bottom surface of the second accommodating groove.

11. The battery cell according to claim 10, characterized in that: Along the first direction, the second root portion has a second surface away from the second main body, the second pole ear portion is protruded from the second surface, and the second surface is matched with the bottom surface of the second accommodating groove.

12. The battery cell according to claim 3, characterized in that: The mounting frame is provided with a through hole, the through hole penetrates the mounting frame along the first direction, and the through hole is configured to allow electrolyte to pass through.

13. The battery cell according to claim 12, characterized in that: The mounting frame is provided with a plurality of through holes.

14. The battery cell according to claim 12, characterized in that: A cavity is formed inside the mounting frame, and the cavity is communicated with the through hole.

15. The battery cell according to claim 3, characterized in that: The battery cell further comprises: A connecting member connects the mounting frame, the first body and the second body.

16. The battery cell according to claim 15, characterized in that: The connecting member is bonded to the mounting frame, the first body and the second body.

17. The battery cell according to claim 15, characterized in that: The connecting member surrounds the outer sides of the mounting frame, the first body and the second body around an axis extending along the first direction.

18. The battery cell according to any one of claims 2 to 17, characterized in that: The first electrode assembly includes two first electrode tabs, the two first electrode tabs have opposite polarities and are both arranged at one end of the first body facing the second body; The second electrode assembly includes two second electrode tabs, the two second electrode tabs have opposite polarities and are both arranged at one end of the second body facing the first body; The first electrode tab and the second electrode tab having the same polarity are connected.

19. The battery cell according to claim 18, characterized in that: The housing has a wall portion, and along the first direction, the first electrode assembly is located between the wall portion and the second electrode assembly; The battery cell further comprises two electrode terminals, both of which are insulated and mounted on the wall portion, and the electrode terminals are used to output or input electrical energy of the battery cell; The first electrode assembly further includes two third pole tabs, which have opposite polarities and are both arranged at one end of the first body facing the wall along the first direction, and the two third pole tabs are respectively connected to the two electrode terminals.

20. The battery cell according to claim 19, characterized in that: The housing comprises: A housing having an opening formed therein, wherein the housing is used to accommodate the first electrode assembly and the second electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

21. The battery cell according to claim 19, characterized in that: The housing comprises: A shell, comprising an integrally formed side wall and the wall portion, wherein the side wall is disposed around the wall portion, and along the first direction, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define an accommodating cavity for accommodating the first electrode assembly and the second electrode assembly; An end cap closes the opening.

22. The battery cell according to claim 1, characterized in that: The battery cell further comprises: An insulating member is wrapped around an axis extending along the first direction and is arranged on the outer sides of the first electrode assembly and the second electrode assembly, and is configured to insulate and isolate the first electrode assembly from the outer shell and the second electrode assembly from the outer shell.

23. The battery cell according to claim 1, characterized in that: The length direction of the shell is consistent with the first direction, and the length of the shell is L, satisfying that L≥200mm.

24. The battery cell according to claim 23, characterized in that: L≥250mm.

25. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 24.

26. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 24, wherein the battery cell is used to provide electrical energy.

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