Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a first electrode terminal, an electrode assembly and a first adapter. The housing has a first wall. The first electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell and is provided with a first tab; the first adapter comprises a first connecting part, a second connecting part and a bending part, the first connecting part is electrically connected with the first electrode terminal, the second connecting part is electrically connected with the first tab, the bending part is connected with the first connecting part and the second connecting part, and the first connecting part and the second connecting part are arranged on the same projection plane perpendicular to the thickness direction of the first wall. The orthographic projection of the first connecting part and the orthographic projection of the second connecting part are at least partially overlapped. The bending part comprises at least two first conductive layers which are arranged in a stacked mode. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery device technology is an important factor related to their development.

[0003] During the manufacturing process of the battery device, the reliability of the battery device is an issue that cannot be ignored. Therefore, how to improve the reliability of the battery device is a technical problem that needs to be solved urgently in the battery device technology. Utility Model Content

[0004] The present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a battery cell, which includes a shell, a first electrode terminal, an electrode assembly and a first adapter. The shell has a first wall; the first electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell, and the electrode assembly has a first pole ear; the first adapter includes a first connecting portion, a second connecting portion and a bending portion, the first connecting portion is electrically connected to the first electrode terminal, the second connecting portion is electrically connected to the first pole ear, the bending portion connects the first connecting portion and the second connecting portion, and on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first connecting portion and the orthographic projection of the second connecting portion at least partially overlap. Wherein, the bending portion includes at least two first conductive layers stacked.

[0007] According to the battery cell of the embodiment of the present application, the first adapter is a bending structure, the first connection part and the second connection part are connected through the bending part, and the orthographic projection of the first connection part and the orthographic projection of the second connection part at least partially overlap, when the battery cell is vibrated, the first adapter can absorb the force generated by the movement of the electrode assembly; further, the bending part includes at least two layers of conductive layers stacked and arranged, which can form a buffer structure between the first electrode terminal and the first pole ear, which is convenient for the bending of the first adapter and is conducive to the first adapter absorbing the force generated by the movement of the electrode assembly, and can disperse the stress of the bending part of the first pole ear, reduce the risk of fatigue cracking of the first pole ear, and make the battery cell have higher reliability. According to some embodiments of the present application, at least one first conductive layer is provided with a weakened portion.

[0008] In the above scheme, the weakened portion is arranged on at least one first conductive layer, which can reduce the overall strength of the bending portion. The bending difficulty of the first adapter is relatively low, which facilitates the bending portion to bend relative to the first connecting portion and the second connecting portion, and the processing and manufacturing difficulty is relatively low.

[0009] According to some embodiments of the present application, the weakened portion includes at least one of a through hole, a groove, and a notch.

[0010] In the above scheme, the through holes, grooves and notches are all of low processing difficulty, easy to process and manufacture, and reduce manufacturing costs.

[0011] According to some embodiments of the present application, the weakened portion is disposed on the inner side of the bent portion.

[0012] In the above solution, the weakened portion is located on the inner side of the bending portion, which facilitates the bending of the first adapter.

[0013] According to some embodiments of the present application, when the first adapter is in an unfolded state, the first connecting portion, the bending portion and the second connecting portion are distributed sequentially along the length direction of the first adapter; the length direction of the weakened portion is parallel to the width direction of the first adapter.

[0014] In the above scheme, the length direction of the weakened portion is parallel to the width direction of the first adapter, and the weakened portion has a larger size in the width direction of the first adapter, further reducing the strength of the bending portion and facilitating the bending portion to bend relative to the first connecting portion and the second connecting portion.

[0015] According to some embodiments of the present application, there are multiple weakened portions, and the multiple weakened portions are arranged at intervals along the width direction of the first adapter.

[0016] In the above scheme, multiple weakened portions are arranged at intervals along the width direction of the first adapter. On the one hand, the strength of the bending portion in the width direction of the first adapter can be reduced, which facilitates reducing the bending difficulty of the first adapter; on the other hand, the heat dissipation area of ​​the bending portion can be increased, so that the bending portion has a better heat dissipation effect.

[0017] According to some embodiments of the present application, the bending portion has a first end face and a second end face that are relatively arranged along the width direction of the first adapter, and the multiple weakened portions include a first weakened portion and a second weakened portion, one end of the first weakened portion extends to the first end face, and one end of the second weakened portion extends to the second end face.

[0018] In the above scheme, one end of the first weakened portion extends to the first end face, and one end of the second weakened portion extends to the second end face, so that the first weakened portion and the second weakened portion can be processed and manufactured from the end of the first adapter in the width direction of the first adapter, and the processing and manufacturing difficulty is relatively low.

[0019] According to some embodiments of the present application, the second connecting portion includes a plurality of second conductive layers stacked together, and the first electrode tab is sandwiched between the plurality of second conductive layers.

[0020] In the above solution, the multiple layers of second conductive layers clamp the first pole tab, so as to facilitate the welding connection between the multiple layers of second conductive layers and the first pole tab, and to facilitate the assembly of the first adapter and the first pole tab.

[0021] According to some embodiments of the present application, the number of first conductive layers is less than or equal to the number of second conductive layers.

[0022] In the above scheme, when the number of layers of the first conductive layer is less than the number of layers of the second conductive layer, the bending portion has a lower strength, which is conducive to bending of the bending portion; when the number of layers of the first conductive layer is equal to the number of layers of the second conductive layer, the bending portion can have a higher current carrying capacity, which facilitates the flow of current on the first adapter.

[0023] According to some embodiments of the present application, each first conductive layer is integrally formed with a second conductive layer.

[0024] In the above solution, the first conductive layer and the second conductive layer are integrally formed, the first conductive layer and the second conductive layer are firmly connected, and are easy to process and manufacture.

[0025] According to some embodiments of the present application, the thickness of the second conductive layer is equal to the thickness of the first conductive layer.

[0026] In the above solution, the thickness of the second conductive layer is equal to the thickness of the first conductive layer, which is convenient for processing and manufacturing.

[0027] According to some embodiments of the present application, the first electrode tab includes a plurality of first sub-electrode tabs stacked in layers, and the plurality of first sub-electrode tabs are sandwiched between two adjacent second conductive layers.

[0028] In the above scheme, multiple first sub-pole ears are stacked so that the first pole ear has a higher current carrying capacity; multiple first sub-pole ears are sandwiched between two adjacent second conductive layers to facilitate the connection between the first pole ear and the second connecting part, thereby improving the connection reliability between the first pole ear and the first adapter.

[0029] According to some embodiments of the present application, the number of layers of the second conductive layer of the second connecting portion located on both sides of the first electrode tab is equal.

[0030] In the above solution, the second connecting portion has the same number of second conductive layers on both sides of the first electrode tab, which can improve the welding quality between the multiple second conductive layers and the first electrode tab, so that the second connecting portion is firmly connected to the first electrode tab.

[0031] According to some embodiments of the present application, the first connection portion includes at least two third conductive layers stacked together.

[0032] In the above solution, the third conductive layer is a multi-layer structure, and each first conductive layer can be connected to one third conductive layer, so as to facilitate the connection between the first connecting portion and the bending portion.

[0033] According to some embodiments of the present application, the number of first conductive layers is less than or equal to the number of third conductive layers.

[0034] In the above scheme, when the number of layers of the first conductive layer is less than the number of layers of the third conductive layer, the bending portion has a lower strength, which is conducive to bending of the bending portion; when the number of layers of the first conductive layer is equal to the number of layers of the third conductive layer, the bending portion can have a higher current carrying capacity, which facilitates the flow of current on the first adapter.

[0035] According to some embodiments of the present application, each first conductive layer is integrally formed with a third conductive layer.

[0036] In the above solution, the first conductive layer and the third conductive layer are integrally formed, the first conductive layer and the third conductive layer are firmly connected, and are easy to process and manufacture.

[0037] According to some embodiments of the present application, the thickness of the third conductive layer is equal to the thickness of the first conductive layer.

[0038] In the above solution, the thickness of the third conductive layer is equal to the thickness of the first conductive layer, which is convenient for processing and manufacturing.

[0039] According to some embodiments of the present application, the first connecting portion is a single-layer structure.

[0040] In the above solution, the first connecting portion is a single-layer structure with a simple structure, which is conducive to the flow of current.

[0041] According to some embodiments of the present application, the thickness of each first conductive layer is greater than or equal to 0.05 mm and less than or equal to 0.25 mm.

[0042] In the above scheme, the thickness of each first conductive layer satisfies the above relationship (greater than or equal to 0.05 mm, and less than or equal to 0.25 mm). On the one hand, the processing and manufacturing difficulty is low, which is convenient for processing and manufacturing. On the other hand, the bending difficulty of the bending part is low, which is convenient for bending the first adapter.

[0043] According to some embodiments of the present application, the thickness of each first conductive layer is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

[0044] In the above scheme, when the thickness of each first conductive layer is greater than or equal to 0.1 mm, the first conductive layer has a thicker thickness, further reducing the difficulty of processing and manufacturing; when the thickness of each first conductive layer is less than or equal to 0.2 mm, the first conductive layer has a lower strength, further reducing the difficulty of bending the bending portion.

[0045] According to some embodiments of the present application, the first adapter is made of copper, and the maximum thickness of the bent portion is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0046] In the above scheme, the material of the first adapter is copper, which has good conductivity, and the maximum thickness of the bending portion satisfies the above relationship (greater than or equal to 0.4 mm, and less than or equal to 1.5 mm). On the one hand, the bending portion has a larger flow area, and the first adapter has a higher flow capacity. On the other hand, the strength of the bending portion is relatively low, which facilitates bending of the bending portion.

[0047] According to some embodiments of the present application, the maximum thickness of the bent portion is greater than or equal to 0.6 mm and less than or equal to 1.2 mm.

[0048] In the above scheme, when the maximum thickness of the bending portion is greater than or equal to 0.6 mm, the bending portion has a larger flow area, further improving the flow capacity of the first adapter; when the maximum thickness of the bending portion is less than or equal to 1.2 mm, the strength of the bending portion is relatively low, further reducing the bending difficulty of the bending portion.

[0049] According to some embodiments of the present application, the material of the first adapter is aluminum, and the maximum thickness of the bent portion is greater than or equal to 0.4 mm and less than or equal to 1.8 mm.

[0050] In the above scheme, the material of the first adapter is aluminum, which has low cost and low density, and aluminum has good processing performance; the maximum thickness of the bending portion satisfies the above relationship (greater than or equal to 0.4 mm, and less than or equal to 1.8 mm). On the one hand, the bending portion has a larger flow area, and the first adapter can have a higher flow capacity. On the other hand, the strength of the bending portion is relatively low, which facilitates bending of the bending portion.

[0051] According to some embodiments of the present application, the maximum thickness of the bent portion is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0052] In the above scheme, when the maximum thickness of the bending portion is greater than or equal to 0.7 mm, the bending portion has a larger flow area, further improving the flow capacity of the first adapter; when the maximum thickness of the bending portion is less than or equal to 1.5 mm, the strength of the bending portion is relatively low, further reducing the bending difficulty of the bending portion.

[0053] According to some embodiments of the present application, the number of first conductive layers is greater than or equal to 10 and less than or equal to 12; the thickness of each first conductive layer is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

[0054] In the above scheme, the number of first conductive layers and the thickness of each first conductive layer satisfy the above relationship. On the one hand, it is convenient to process and manufacture the first conductive layer. On the other hand, the bending difficulty of the bending portion is low, which facilitates the bending of the first adapter.

[0055] According to some embodiments of the present application, the minimum cross-sectional area of ​​the bending portion is H1, and the minimum cross-sectional area of ​​the first connecting portion is H2, satisfying 0.1*H2≤H1≤0.5*H2.

[0056] In the above scheme, the minimum cross-sectional area of ​​the bending portion and the minimum cross-sectional area of ​​the first connecting portion satisfy the above relationship (0.1*H2≤H1≤0.5*H2). On the one hand, the bending difficulty of the first adapter can be reduced, and on the other hand, the bending portion has a higher current flow capacity.

[0057] According to some embodiments of the present application, 0.2*H2≤H1≤0.4*H2.

[0058] In the above scheme, when H1≥0.2*H2, the cross-sectional area of ​​the bending portion is larger, further improving the flow capacity of the bending portion; when H1≤0.4*H2, the strength of the bending portion is lower, further reducing the bending difficulty of the bending portion.

[0059] According to some embodiments of the present application, the first adapter includes a plurality of conductive sheets arranged in a stacked manner, each conductive sheet includes a first conductive layer, a second conductive layer and a third conductive layer formed as one piece, the multiple first conductive layers form a bending portion, the multiple second conductive layers form a second connecting portion, and the multiple third conductive layers form a first connecting portion.

[0060] In the above solution, the first adapter is a multi-layer structure, and the first conductive layer, the second conductive layer and the third conductive layer are integrally formed, which is easy to process and manufacture, and the first conductive layer is firmly connected to the second conductive layer and the third conductive layer.

[0061] According to some embodiments of the present application, each conductive sheet in the plurality of conductive sheets has the same thickness.

[0062] In the above solution, the thickness of each conductive sheet in the plurality of conductive sheets is equal, which is convenient for batch processing and manufacturing, and the processing cost is low.

[0063] According to some embodiments of the present application, two adjacent conductive sheets among the plurality of conductive sheets are welded or connected by conductive glue.

[0064] In the above solution, two adjacent conductive sheets among the multiple conductive sheets are welded or connected by conductive adhesive to facilitate electrical connection between the multiple conductive sheets, so that the first adapter has a higher current carrying capacity.

[0065] According to some embodiments of the present application, the outer shell includes a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall; the electrode assembly also has a second pole ear, and the polarity of the second pole ear is opposite to the polarity of the first pole ear; the battery cell also includes a second electrode terminal, the second electrode terminal is arranged on the end cover or the shell, and the second electrode terminal is electrically connected to the second pole ear.

[0066] In the above solution, the end cap is the first wall, which facilitates the assembly of the first electrode terminal and the first wall, facilitates the connection of the first adapter and the first electrode terminal, and facilitates the assembly of the battery cell. When the second electrode terminal is set on the end cap, the second electrode tab and the first electrode tab can be located on the same side of the electrode assembly, which facilitates the connection of the second electrode terminal and the first electrode terminal to the electrode assembly; when the second electrode terminal is set on the housing, the second electrode terminal and the first electrode terminal are set flexibly, which facilitates the connection of the battery cell with other components.

[0067] According to some embodiments of the present application, the outer shell includes a first end cover, a shell and a second end cover, the shell has two openings arranged opposite to each other, the first end cover and the second end cover respectively cover the two openings, and the first end cover is the first wall; the electrode assembly also has a second pole ear, and the polarity of the second pole ear is opposite to that of the first pole ear; the battery cell also includes a second electrode terminal, the second electrode terminal is arranged on the second end cover, and the second electrode terminal is electrically connected to the second pole ear.

[0068] In the above scheme, the second electrode terminal is arranged on the second end cover, and the first end cover and the second end cover are arranged opposite to each other. The first end cover and the second end cover can be assembled with the shell from both ends of the shell respectively, which is convenient for improving the assembly flexibility of the battery cell and facilitating the assembly of the battery cell.

[0069] According to some embodiments of the present application, the electrode assembly has two first pole ears; the first adapter includes two second connection parts and two bending parts, the two second connection parts are arranged at intervals along the thickness direction of the electrode assembly, each second connection part is connected to the first connection part through a bending part, and each first pole ear is connected to a second connection part.

[0070] In the above scheme, when the electrode assembly is provided with a plurality of first sub-pole ears, the battery cell can have a higher energy density, and the plurality of first sub-pole ears can be divided into two first pole ears, and the two first pole ears can be spaced apart along the thickness direction of the electrode assembly to facilitate the gathering of the plurality of first sub-pole ears; the first adapter includes two second connecting parts, each of which is connected to the first connecting part through a bending part, so as to facilitate the connection between the first pole ear and the first adapter; at the same time, the setting of the two second connecting parts and the two bending parts is convenient for dispersing the stress of the two first pole ears, so as to reduce the risk of cracking of the first pole ears.

[0071] According to some embodiments of the present application, the housing is in the shape of a rectangular parallelepiped.

[0072] In the above solution, the outer shell is in the form of a rectangular parallelepiped, has high strength, and is convenient for stacking a plurality of battery cells, so as to improve the energy density of the battery device composed of the battery cells.

[0073] In a second aspect, an embodiment of the present application further provides a battery device, which includes a battery cell provided according to any of the above embodiments.

[0074] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell or a battery device provided according to any of the above embodiments, and the battery cell or the battery device is used to provide electrical energy.

[0075] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] 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.

[0077] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0078] Figure 2 A schematic diagram of the structural decomposition of a battery device provided in some embodiments of the present application;

[0079] Figure 3 A schematic diagram of the structural decomposition of a battery cell provided in some embodiments of the present application;

[0080] Figure 4 A schematic diagram of assembling a first adapter and a first tab provided in some embodiments of the present application;

[0081] Figure 5 A schematic diagram of a bending portion provided in some embodiments of the present application;

[0082] Figure 6 A schematic diagram of a first adapter in an expanded state provided in some embodiments of the present application;

[0083] Figure 7 Schematic diagram of a bending portion provided in some other embodiments of the present application;

[0084] Figure 8 A schematic diagram of assembling a first adapter and a first tab provided in some other embodiments of the present application;

[0085] Fig. 9 A schematic diagram of the structure of a first adapter provided in some embodiments of the present application;

[0086] Fig.10 for Fig. 9 A local enlarged view of point A;

[0087] Fig.11 A schematic diagram of assembling a first adapter and a first tab provided in some other embodiments of the present application;

[0088] Fig.12 A schematic diagram of the structural decomposition of a battery cell provided in some other embodiments of the present application;

[0089] Fig.13 A schematic diagram of the structural decomposition of a battery cell provided in some other embodiments of the present application;

[0090] Fig.14 A schematic diagram of a structural decomposition of a battery cell from one perspective provided in some embodiments of the present application;

[0091] Fig.15 A schematic diagram of a structural decomposition of a battery cell from another perspective provided in some embodiments of the present application;

[0092] Fig.16 A schematic diagram of the assembly of the electrode assembly and the first adapter provided in some embodiments of the present application.

[0093] Icons: 100-battery device; 10-housing; 11-first sub-housing; 12-second sub-housing; 20-battery cell; 21-housing; 21a-housing; 21b-end cover; 21c-first end cover; 21d-second end cover; 211-first wall; 212-first side wall; 213-second side wall; 22-electrode assembly; 22a-first pole ear; 22b-second pole ear; 220-main body; 220a-first edge; 220b-second edge; 221-first sub-pole ear; 23a-first electrode terminal; 23b-second electrode terminal; 24-first adapter; 24a-conductive sheet; 241-second A connecting portion; 2411-a third conductive layer; 242-a second connecting portion; 2421-a second conductive layer; 243-a bending portion; 243a-a first end face; 243b-a second end face; 2431-a first conductive layer; 244-a weakened portion; 244a-a first weakened portion; 244b-a second weakened portion; 25-a first insulating member; 26-a second insulating member; 27-a second adapter; 28-a pressure relief mechanism; 29-a third insulating member; 200-a controller; 300-a motor; 1000-a vehicle; K-a width direction; L-a length direction; X-a first direction; Y-a thickness direction of the electrode assembly; Z-a thickness direction of the first wall. DETAILED DESCRIPTION

[0094] 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 and completely 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.

[0095] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0096] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0097] 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.

[0098] 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.

[0099] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0100] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0101] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0102] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0103] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0104] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0105] As an example, the box may include a first sub-box and a second sub-box. The first sub-box and the second sub-box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first sub-box can be a top cover or a bottom plate.

[0106] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0107] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0108] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0109] 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.

[0110] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer 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.).

[0115] 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 conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0116] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0117] As an example, the negative 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.

[0118] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0119] As an example, the negative electrode active material may adopt the negative electrode active material for the battery 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 and 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.

[0120] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0121] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0122] 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.

[0123] 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.

[0124] In some embodiments, the electrode assembly is a laminate structure.

[0125] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), or a composite metal housing (such as a copper-aluminum composite housing).

[0126] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0127] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0128] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0129] In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing may protect the electrode assembly and prevent leakage of electrolyte. When the housing is a non-sealed structure, the housing may protect the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly, the sealing bag being used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0130] As an example, the battery cell may be a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, and the polygonal prismatic battery is, for example, a hexagonal prismatic battery.

[0131] The development of battery device technology must take into account multiple design factors at the same time, such as performance parameters such as energy density, discharge capacity, charge and discharge rate, and the reliability of the battery device must also be considered.

[0132] In some embodiments, a battery cell includes a housing, an electrode terminal, an electrode assembly, and an adapter. The electrode terminal is disposed on a first wall of the housing, the electrode assembly is disposed in the housing, and the electrode assembly has a tab; the adapter electrically connects the electrode terminal and the tab. In order to facilitate the assembly of the battery cell, the tab is relatively long. After the tab is connected to the adapter and the tab is bent, the electrode assembly is loaded into the housing. Since the adapter has a high strength, and one end of the adapter is welded to the tab, and the other end of the adapter is welded to the electrode terminal, during the transportation of the battery cell or the operation of the electrical device, when the battery cell is subjected to force and vibration, the electrode assembly is easy to move relative to the housing, and the bending position of the tab is easy to fatigue and crack, resulting in poor current carrying capacity of the battery cell, and the cracked pole piece is easy to puncture the isolation membrane to cause a short circuit between the positive and negative electrodes, affecting the reliability of the battery cell.

[0133] In view of this, in order to solve the problem of fatigue cracking of the bending position of the pole ear due to vibration of the battery cell, resulting in low reliability of the battery cell, the present application provides a battery cell, which includes a shell, a first electrode terminal, an electrode assembly and a first adapter. The shell has a first wall; the first electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell, and the electrode assembly has a first pole ear; the first adapter includes a first connecting part, a second connecting part and a bending part, the first connecting part is electrically connected to the first electrode terminal, the second connecting part is electrically connected to the first pole ear, and the bending part connects the first connecting part and the second connecting part, and on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first connecting part and the orthographic projection of the second connecting part at least partially overlap. Wherein, the bending part includes at least two layers of first conductive layers stacked. The battery cell has high reliability.

[0134] In such a battery cell, the first adapter is a bending structure, the first connecting part and the second connecting part are connected through the bending part, and the orthographic projection of the first connecting part and the orthographic projection of the second connecting part at least partially overlap, when the battery cell is vibrated, the first adapter can absorb the force generated by the movement of the electrode assembly; further, the bending part includes at least two layers of first conductive layers stacked together, which can form a buffer structure between the first electrode terminal and the first pole ear, which is convenient for bending the first adapter and helps the first adapter absorb the force generated by the movement of the electrode assembly, and can disperse the stress of the bending part of the first pole ear, reduce the risk of fatigue cracking of the first pole ear, so that the battery cell has higher reliability.

[0135] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0136] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0137] 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.

[0138] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. 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 device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used for powering the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0139] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0140] In some embodiments of the present application, the battery device 100 can not only serve as an operating 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.

[0141] Please refer to Figure 2 , Figure 2 The battery device 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is contained in the housing 10 .

[0142] The box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first sub-box 11 and a second sub-box 12, the first sub-box 11 and the second sub-box 12 cover each other, and the first sub-box 11 and the second sub-box 12 jointly define a storage space for accommodating the battery cell 20. The second sub-box 12 may be a hollow structure with one end open, and the first sub-box 11 may be a plate-like structure, and the first sub-box 11 covers the open side of the second sub-box 12, so that the first sub-box 11 and the second sub-box 12 jointly define a storage space; the first sub-box 11 and the second sub-box 12 may also be hollow structures with one side open, and the open side of the first sub-box 11 covers the open side of the second sub-box 12.

[0143] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A 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 a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 10.

[0144] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0145] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components. The housing 21 includes a shell 21a and an end cap 21b. The shell 21a has an opening, and the end cap 21b closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0146] The shell 21a is a component used to cooperate with the end cap 21b to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 21a and the end cap 21b can be independent components. The shell 21a can be of various shapes and sizes. Specifically, the shape of the shell 21a can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 21a can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0147] The end cap 21b refers to a component that covers the opening of the shell 21a to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21b can be adapted to the shape of the shell 21a to match the shell 21a. Optionally, the end cap 21b can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21b is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the reliability can also be improved. Functional components such as electrode terminals and pressure relief mechanisms can be provided on the end cap 21b. The electrode terminal can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. The material of the end cap 21b can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 21b, and the insulating structure may be used to isolate the electrical connection components in the housing 21a from the end cap 21b to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0148] The electrode assembly 22 is a component where electrochemical reactions occur in the battery cell 20. The housing 21a may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets, which is used to separate the positive and negative electrode sheets to avoid internal short circuits between the positive and negative electrode sheets.

[0149] Please refer to Figure 3 , and further refer to Figure 4 , Figure 4 Schematic diagram of the assembly of the first adapter and the first pole ear provided in some embodiments of the present application. The embodiment of the present application provides a battery cell 20, which includes a shell 21, a first electrode terminal 23a, an electrode assembly 22 and a first adapter 24. The shell 21 has a first wall 211; the first electrode terminal 23a is arranged on the first wall 211; the electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 has a first pole ear 22a; the first adapter 24 includes a first connecting portion 241, a second connecting portion 242 and a bending portion 243, the first connecting portion 241 is electrically connected to the first electrode terminal 23a, the second connecting portion 242 is electrically connected to the first pole ear 22a, and the bending portion 243 connects the first connecting portion 241 and the second connecting portion 242. On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first connecting portion 241 and the orthographic projection of the second connecting portion 242 at least partially overlap. Among them, the bending portion 243 includes at least two layers of first conductive layers 2431 stacked.

[0150] The material of the housing 21 can be metal, such as steel, aluminum, etc.

[0151] In some embodiments, the first wall 211 may be an end cap 21 b.

[0152] The first electrode terminal 23a may be a positive electrode terminal or a negative electrode terminal.

[0153] The first electrode terminal 23a may be insulated and connected to the first wall 211 , for example, an insulating structure is provided between the first electrode terminal 23a and the first wall 211 . Alternatively, the first electrode terminal 23a may also be electrically connected to the first wall 211 .

[0154] The polarity of the first electrode tab 22 a is the same as the polarity of the first electrode terminal 23 a , and the first electrode tab 22 a may be a positive electrode tab or a negative electrode tab.

[0155] The first connection portion 241 is used to be electrically connected to the first electrode terminal 23 a . For example, the first connection portion 241 and the first electrode terminal 23 a are welded to ensure that the first connection portion 241 and the first electrode terminal 23 a are firmly connected.

[0156] The second connection portion 242 is used to be electrically connected to the first electrode tab 22 a . For example, the second connection portion 242 and the first electrode tab 22 a are welded to ensure that the second connection portion 242 and the first electrode tab 22 a are firmly connected.

[0157] The bending portion 243 is a bending structure formed after the first connection portion 241 and the second connection portion 242 are bent. For example, the first adapter 24 is bent so that the first connection portion 241 and the second connection portion 242 at least partially overlap in the thickness direction Z of the first wall, and the bending portion 243 connects the first connection portion 241 and the second connection portion 242.

[0158] In some embodiments, the first connecting portion 241 , the bending portion 243 , and the second connecting portion 242 may be sequentially distributed along the length direction L of the first adapter 24 .

[0159] Taking the thickness direction Z of the first wall as the projection direction, the orthographic projection of the first connecting portion 241 at least partially overlaps with the orthographic projection of the second connecting portion 242, and the first electrode terminal 23a and the first pole ear 22a at least partially overlap in the thickness direction Z of the first wall; relative to the first electrode terminal 23a and the first pole ear 22a being staggered in the thickness direction Z of the first wall, the length of the first connecting portion 241 can be designed to be shorter to facilitate the current to flow between the first pole ear 22a and the first electrode terminal 23a.

[0160] The bending portion 243 is a multi-layer structure, and the multi-layer first conductive layer 2431 is stacked to form the bending portion 243, and the multi-layer first conductive layer 2431 is electrically connected to the first connecting portion 241 and the second connecting portion 242, respectively, so that the first adapter 24 has a higher current carrying capacity. For example, at least one layer of the multi-layer first conductive layer 2431 can be integrally formed with the first connecting portion 241, and at least one layer of the multi-layer first conductive layer 2431 can be integrally formed with the second connecting portion 242. For another example, the multi-layer first conductive layer 2431 can be welded to the first connecting portion 241, and the multi-layer first conductive layer 2431 can be welded to the second connecting portion 242.

[0161] Compared with the single-layer structure of the bending portion 243 , the multi-layer structure of the bending portion 243 can improve the flexibility of the bending portion 243 and facilitate stress absorption.

[0162] In some embodiments, the first conductive layer 2431 may be a metal sheet. For example, the first conductive layer 2431 may be made of copper or aluminum, which has good conductive properties.

[0163] According to the battery cell 20 of the embodiment of the present application, the first adapter 24 is a bending structure, the first connecting portion 241 and the second connecting portion 242 are connected by the bending portion 243, and the orthographic projection of the first connecting portion 241 and the orthographic projection of the second connecting portion 242 at least partially overlap, when the battery cell 20 is vibrated, the first adapter 24 can absorb the force generated by the movement of the electrode assembly 22; further, the bending portion 243 includes at least two layers of first conductive layers 2431 stacked together, which can form a buffer structure between the first electrode terminal 23a and the first pole ear 22a, which is convenient for the first adapter 24 to bend, and is conducive to the first adapter 24 absorbing the force generated by the movement of the electrode assembly 22, and can disperse the stress of the bending portion of the first pole ear 22a, reduce the risk of fatigue cracking of the first pole ear 22a, so that the battery cell 20 has higher reliability.

[0164] According to some embodiments of the present application, the battery cell 20 also includes a second insulating member 26, which is arranged on the side of the first wall 211 facing the interior of the battery cell 20, and the second insulating member 26 is used to separate the electrode assembly 22 from the first wall 211 to reduce the risk of short circuit between the electrode assembly 22 and the first wall 211.

[0165] Please refer to Figure 5 , Figure 5 Schematic diagram of a bending portion provided in some embodiments of the present application. According to some embodiments of the present application, at least one first conductive layer 2431 is provided with a weakened portion 244 .

[0166] The weakened portion 244 refers to a region where the strength of the first conductive layer 2431 is relatively weak. For example, the weakened portion 244 may be a through hole, a groove, a notch, or the like.

[0167] In some embodiments, the weakened portion 244 may be provided on any one of the first conductive layers 2431, or may be provided on any multiple layers of the first conductive layers 2431. Correspondingly, along the stacking direction of the multiple first conductive layers 2431, the weakened portion 244 may be provided on the first conductive layer 2431 at the end of the multiple first conductive layers 2431, or may be provided on the first conductive layer 2431 in the middle of the multiple first conductive layers 2431, or may be provided on the first conductive layer 2431 at the end of the multiple first conductive layers 2431 and the first conductive layer 2431 in the middle.

[0168] In some embodiments, the weakened portion 244 is disposed on all first conductive layers 2431 to facilitate batch processing and manufacturing.

[0169] In some embodiments, the weakened portions 244 of the multi-layer first conductive layer 2431 at least partially overlap along the thickness direction of the bending portion 243. For example, the multi-layer first conductive layer 2431 can be batch processed and formed. When the multi-layer first conductive layer 2431 is stacked, the weakened portions 244 of the multi-layer first conductive layer 2431 overlap. After the multi-layer first conductive layer 2431 is bent to form the bending portion 243, the weakened portions 244 of the multi-layer first conductive layer 2431 can at least partially overlap.

[0170] In some embodiments, the weakened portion 244 may be circular, square, or irregular in shape.

[0171] In the above scheme, the weakened portion 244 is arranged on at least one first conductive layer 2431, which can reduce the overall strength of the bending portion 243. The bending difficulty of the first adapter 24 is relatively low, which facilitates the bending portion 243 to bend relative to the first connecting portion 241 and the second connecting portion 242, and the processing and manufacturing difficulty is relatively low.

[0172] According to some embodiments of the present application, the weakened portion 244 includes at least one of a through hole, a groove, and a notch.

[0173] In some embodiments, the weakened portion 244 may be a through hole penetrating the first conductive layer 2431 along the thickness direction of the first conductive layer 2431 .

[0174] In some embodiments, the weakened portion 244 may be a groove disposed in the first conductive layer 2431 . For example, a portion of material is removed from the surface of the first conductive layer 2431 to form the weakened portion 244 on the first conductive layer 2431 .

[0175] In some embodiments, the weakened portion 244 may be a notch provided on the first conductive layer 2431 . For example, the notch is formed on the surface of the first conductive layer 2431 by laser etching, mechanical cutting with a cutting tool, or the like.

[0176] In some embodiments, the weakened portion 244 may include two or three of a through hole, a groove, and a notch.

[0177] In the above scheme, the through holes, grooves and notches are all of low processing difficulty, easy to process and manufacture, and reduce manufacturing costs.

[0178] According to some embodiments of the present application, the weakened portion 244 is disposed on the inner side of the bent portion 243 .

[0179] The bending portion 243, the first connecting portion 241 and the second connecting portion 242 enclose a first space. The inner side of the bending portion 243 refers to the side of the bending portion 243 facing the first space. It can also be understood that the inner side of the bending portion 243 refers to the concave side of the bending portion 243.

[0180] The weakened portion 244 may be located in one first conductive layer 2431 on the inner side of the bent portion 243 , or the weakened portion 244 may be located in at least two first conductive layers 2431 on the inner side of the bent portion 243 .

[0181] In the above solution, the weakened portion 244 is located inside the bent portion 243 , which facilitates the bending of the first adapter 24 .

[0182] Please refer to Figure 6 , Figure 6 Schematic diagram of the first adapter in the unfolded state provided for some embodiments of the present application. According to some embodiments of the present application, when the first adapter 24 is unfolded, the first connecting portion 241, the bending portion 243 and the second connecting portion 242 are sequentially distributed along the length direction L of the first adapter 24; the length direction of the weakened portion 244 is parallel to the width direction K of the first adapter 24.

[0183] Please refer to Fig. 9 The dotted line in the figure can represent the boundary between the bending portion 243 and the first connecting portion 241 and the second connecting portion 242.

[0184] Before the first adapter 24 is assembled with the first electrode terminal 23a and the first pole lug 22a, the first adapter 24 is in an unfolded state. In the length direction L of the first adapter 24, the first connecting portion 241, the bending portion 243 and the second connecting portion 242 are distributed in sequence to facilitate the assembly of the first adapter 24 with the first electrode terminal 23a and the first pole lug 22a. After the first connecting portion 241 is connected to the first electrode terminal 23a and the second connecting portion 242 is connected to the first pole lug 22a, the first adapter 24 is bent so that the first connecting portion 241 and the second connecting portion 242 at least partially overlap in the thickness direction Z of the first wall.

[0185] In some embodiments, the weakened portion 244 may be in a strip shape. The weakened portion 244 extends along the width direction K of the first adapter 24 , and can reduce the strength of the bent portion 243 in the width direction K of the first adapter 24 .

[0186] In the above scheme, the length direction of the weakened portion 244 is parallel to the width direction K of the first adapter 24. The weakened portion 244 has a larger size in the width direction K of the first adapter 24, further reducing the strength of the bending portion 243, which is beneficial for the bending portion 243 to bend relative to the first connecting portion 241 and the second connecting portion 242.

[0187] Please refer to Figure 5 and 6 , and further refer to Figure 7 , Figure 7 Schematic diagram of a bending portion provided in some other embodiments of the present application. According to some embodiments of the present application, there are multiple weakened portions 244 , and the multiple weakened portions 244 are arranged at intervals along the width direction K of the first adapter 24 .

[0188] The plurality of weakened portions 244 may be arranged at equal intervals along the width direction K of the first adapter 24 , or the plurality of weakened portions 244 may be arranged at unequal intervals along the width direction K of the first adapter 24 .

[0189] Optionally, a plurality of weakened portions 244 are arranged at equal intervals along the width direction K of the first adapter 24 to facilitate processing and manufacturing.

[0190] The number of weakened portions 244 can be selected according to actual conditions. For example, the total length of the plurality of weakened portions 244 can meet the flow requirement of the bent portion 243, so that the bent portion 243 has a higher flow energy. In addition, the provision of the plurality of weakened portions 244 can increase the heat dissipation surface area of ​​the bent portion 243, which is beneficial to the heat dissipation of the bent portion 243.

[0191] In the above scheme, multiple weakened portions 244 are arranged at intervals along the width direction K of the first adapter 24. On the one hand, the strength of the bending portion 243 in the width direction K of the first adapter 24 can be reduced, which facilitates reducing the bending difficulty of the first adapter 24; on the other hand, the heat dissipation area of ​​the bending portion 243 can be increased, so that the bending portion 243 has a better heat dissipation effect.

[0192] Please refer to Figure 7 According to some embodiments of the present application, the bending portion 243 has a first end face 243a and a second end face 243b that are relatively arranged along the width direction K of the first adapter 24, and the multiple weakened portions 244 include a first weakened portion 244a and a second weakened portion 244b, one end of the first weakened portion 244a extends to the first end face 243a, and one end of the second weakened portion 244b extends to the second end face 243b.

[0193] The first end surface 243 a and the second end surface 243 b are end surfaces at both ends of the bending portion 243 in the width direction K of the first adapter 24 , respectively. The first end surface 243 a and the second end surface 243 b are parallel to each other.

[0194] The first weakened portion 244 a and the second weakened portion 244 b are spaced apart along the width direction K of the first adapter 24 , and the first weakened portion 244 a and the second weakened portion 244 b are respectively located at two ends of the bending portion 243 in the width direction K of the first adapter 24 .

[0195] In some embodiments, the first weakened portion 244a may be a notch formed on the first end surface 243a, and the second weakened portion 244b may be a notch formed on the second end surface 243b.

[0196] In some embodiments, along the width direction K of the first transition component 24 , the length of the first weakened portion 244 a may be equal to the length of the second weakened portion 244 b to facilitate processing and manufacturing.

[0197] In some embodiments, the plurality of weakened portions 244 may further include at least one third weakened portion, and the at least one third weakened portion is located between the first weakened portion 244a and the second weakened portion 244b along the width direction K of the first transition member 24. For example, the number of the third weakened portion may be one, and the third weakened portion may be located in the middle of the bending portion 243 in the width direction K of the first transition member 24.

[0198] In the above scheme, one end of the first weakened portion 244a extends to the first end face 243a, and one end of the second weakened portion 244b extends to the second end face 243b, so that the first weakened portion 244a and the second weakened portion 244b can be processed and manufactured from the end of the first adapter 24 in the width direction K of the first adapter 24, and the processing and manufacturing difficulty is relatively low.

[0199] Please refer to Figure 8 , Figure 8 Schematic diagram of assembly of the first adapter and the first tab provided in some other embodiments of the present application. According to some embodiments of the present application, the second connecting portion 242 includes a plurality of stacked second conductive layers 2421 , and the first tab 22a is sandwiched between the plurality of second conductive layers 2421 .

[0200] The second conductive layer 2421 may be a metal sheet. For example, the second conductive layer 2421 may be made of copper or aluminum, which has good conductive properties.

[0201] In some embodiments, the second conductive layer 2421 can be integrally formed with the first conductive layer 2431, for example, a metal sheet is bent to form the second conductive layer 2421 and the first conductive layer 2431; or, the second conductive layer 2421 can be welded to the first conductive layer 2431 so that the second conductive layer 2421 and the first conductive layer 2431 are firmly connected.

[0202] The first pole tab 22a is clamped by the multi-layer second conductive layer 2421, which facilitates the connection between the multi-layer second conductive layer 2421 and the first pole tab 22a, and facilitates the flow of current between the first pole tab 22a and the second connecting portion 242. The first pole tab 22a is sandwiched between the multi-layer second conductive layer 2421, and the first pole tab 22a can be welded and connected to the multi-layer second conductive layer 2421, so that the first pole tab 22a and the multi-layer second conductive layer 2421 are firmly connected.

[0203] In the above solution, the multi-layer second conductive layer 2421 clamps the first pole tab 22a, so as to facilitate the welding connection between the multi-layer second conductive layer 2421 and the first pole tab 22a, and to facilitate the assembly of the first adapter 24 and the first pole tab 22a.

[0204] Please refer to Fig. 9 , Fig. 9 A schematic diagram of the structure of a first adapter provided in some embodiments of the present application, Fig.10 for Fig. 9 According to some embodiments of the present application, the number of layers of the first conductive layer 2431 is less than or equal to the number of layers of the second conductive layer 2421 .

[0205] In some embodiments, the number of layers of the first conductive layer 2431 can be equal to the number of layers of the second conductive layer 2421, and the second conductive layer 2421 can be integrally formed with the first conductive layer 2431. For example, the first adapter 24 is formed by stacking multiple layers of conductive sheets 24a and then bending them so that the first adapter 24 has a higher current carrying capacity.

[0206] In some embodiments, please refer to Fig. 9 and Fig.10The number of layers of the first conductive layer 2431 can be smaller than the number of layers of the second conductive layer 2421. For example, after the first adapter 24 is stacked by multiple layers of conductive sheets 24a, some layers of conductive sheets 24a are cut off in the area where the bending portion 243 is located, and the conductive sheets 24a are bent, so that the number of layers of the first conductive layer 2431 is smaller than the number of layers of the second conductive layer 2421.

[0207] In the above scheme, when the number of layers of the first conductive layer 2431 is less than the number of layers of the second conductive layer 2421, the bending portion 243 has a lower strength, which is conducive to the bending of the bending portion 243; when the number of layers of the first conductive layer 2431 is equal to the number of layers of the second conductive layer 2421, the bending portion 243 can have a higher current carrying capacity, which facilitates the flow of current on the first adapter 24.

[0208] According to some embodiments of the present application, each first conductive layer 2431 is integrally formed with a second conductive layer 2421 .

[0209] The bending portion 243 and the second connecting portion 242 may be formed by bending a plurality of metal sheets, so that each first conductive layer 2431 may be integrally formed with a second conductive layer 2421 .

[0210] In the above solution, the first conductive layer 2431 and the second conductive layer 2421 are integrally formed, the first conductive layer 2431 and the second conductive layer 2421 are firmly connected, and are easy to process and manufacture.

[0211] According to some embodiments of the present application, the thickness of the second conductive layer 2421 is equal to the thickness of the first conductive layer 2431 .

[0212] When the second conductive layer 2421 and the first conductive layer 2431 are integrally formed, the second conductive layer 2421 and the first conductive layer 2431 may be formed by bending the same metal sheet, so that the thickness of the second conductive layer 2421 is equal to the thickness of the first conductive layer 2431 .

[0213] The thickness of the second conductive layer 2421 being equal to the thickness of the first conductive layer 2431 means that the second conductive layer 2421 and the first conductive layer 2431 can be formed by metal sheets of the same thickness specification, and there may be a processing error between the thickness of the second conductive layer 2421 and the thickness of the first conductive layer 2431 .

[0214] In the above solution, the thickness of the second conductive layer 2421 is equal to the thickness of the first conductive layer 2431, which is convenient for processing and manufacturing.

[0215] Please refer to Figure 8 and Fig.10 According to some embodiments of the present application, the first electrode tab 22 a includes a plurality of first sub-electrode tabs 221 that are stacked, and the plurality of first sub-electrode tabs 221 are sandwiched between two adjacent second conductive layers 2421 .

[0216] The plurality of first sub-electrode tabs 221 are stacked to facilitate electrical connection of the plurality of first sub-electrode tabs 221 . The electrical connection between the first electrode tab 22 a and the first adapter 24 is achieved by connecting the plurality of first sub-electrode tabs 221 to the second connecting portion 242 .

[0217] Multiple first sub-pole ears 221 are sandwiched between two adjacent layers of the second conductive layer 2421. Multiple first sub-pole ears 221 are clamped by two adjacent layers of the second conductive layer 2421, which can increase the connection area between the second connecting portion 242 and the first pole ear 22a, and facilitate welding the first pole ear 22a and the second connecting portion 242 from both sides of the thickness direction of the first pole ear 22a, so as to improve the connection reliability between the first pole ear 22a and the second connecting portion 242.

[0218] In the above scheme, multiple first sub-pole ears 221 are stacked so that the first pole ear 22a has a higher current carrying capacity; multiple first sub-pole ears 221 are sandwiched between two adjacent second conductive layers 2421 to facilitate the connection between the first pole ear 22a and the second connecting portion 242, thereby improving the connection reliability between the first pole ear 22a and the first adapter 24.

[0219] According to some embodiments of the present application, the number of layers of the second conductive layer 2421 of the second connection portion 242 located on both sides of the first electrode tab 22 a is equal.

[0220] The multilayer second conductive layer 2421 is symmetrically distributed on both sides of the first pole tab 22a in the thickness direction, which facilitates welding of the multilayer second conductive layer 2421 and the first pole tab 22a on both sides in the thickness direction of the first pole tab 22a, so that the welding quality of the second connecting portion 242 and the first pole tab 22a is high.

[0221] In the above solution, the number of second conductive layers 2421 of the second connecting portion 242 located on both sides of the first pole tab 22a is equal, which can improve the welding quality of the multiple second conductive layers 2421 and the first pole tab 22a, so that the second connecting portion 242 is firmly connected to the first pole tab 22a.

[0222] Please refer to Fig.11 , Fig.11 Schematic diagram of assembly of the first adapter and the first tab provided in some embodiments of the present application. According to some embodiments of the present application, the first connecting portion 241 includes at least two third conductive layers 2411 stacked.

[0223] The third conductive layer 2411 may be a metal sheet. For example, the third conductive layer 2411 may be made of copper or aluminum, which has high conductivity.

[0224] In some embodiments, the third conductive layer 2411 can be integrally formed with the first conductive layer 2431, for example, a metal sheet is bent to form the third conductive layer 2411 and the first conductive layer 2431; or, the third conductive layer 2411 can be welded to the first conductive layer 2431 so that the third conductive layer 2411 is firmly connected to the first conductive layer 2431.

[0225] In the above solution, the third conductive layer 2411 is a multi-layer structure, and each first conductive layer 2431 can be connected to one third conductive layer 2411 , so as to facilitate the connection between the first connecting portion 241 and the bending portion 243 .

[0226] According to some embodiments of the present application, the number of layers of the first conductive layer 2431 is less than or equal to the number of layers of the third conductive layer 2411 .

[0227] In some embodiments, the number of layers of the first conductive layer 2431 can be equal to the number of layers of the third conductive layer 2411, and the third conductive layer 2411 can be integrally formed with the first conductive layer 2431. For example, the first adapter 24 is formed by stacking multiple layers of conductive sheets 24a and then bending them so that the first adapter 24 has a higher current carrying capacity.

[0228] In some embodiments, the number of layers of the first conductive layer 2431 can be smaller than the number of layers of the third conductive layer 2411. For example, after the first adapter 24 is stacked by multiple layers of conductive sheets 24a, some layers of the conductive sheets 24a are cut off in the area where the bending portion 243 is located and bent, so that the number of layers of the first conductive layer 2431 is smaller than the number of layers of the third conductive layer 2411.

[0229] In the above scheme, when the number of layers of the first conductive layer 2431 is less than the number of layers of the third conductive layer 2411, the bending portion 243 has a lower strength, which is conducive to the bending of the bending portion 243; when the number of layers of the first conductive layer 2431 is equal to the number of layers of the third conductive layer 2411, the bending portion 243 can have a higher current carrying capacity, which facilitates the flow of current on the first adapter 24.

[0230] According to some embodiments of the present application, each first conductive layer 2431 is integrally formed with a third conductive layer 2411 .

[0231] The bending portion 243 and the first connecting portion 241 may be formed by bending a plurality of metal sheets, so that each first conductive layer 2431 may be integrally formed with a third conductive layer 2411 .

[0232] In the above solution, the first conductive layer 2431 and the third conductive layer 2411 are integrally formed, the first conductive layer 2431 and the third conductive layer 2411 are firmly connected, and are easy to process and manufacture.

[0233] According to some embodiments of the present application, the thickness of the third conductive layer 2411 is equal to the thickness of the first conductive layer 2431 .

[0234] When the third conductive layer 2411 and the first conductive layer 2431 are integrally formed, the third conductive layer 2411 and the first conductive layer 2431 may be formed by bending the same metal sheet so that the thickness of the third conductive layer 2411 is equal to the thickness of the first conductive layer 2431 .

[0235] The thickness of the third conductive layer 2411 being equal to the thickness of the first conductive layer 2431 means that the third conductive layer 2411 and the first conductive layer 2431 can be formed by metal sheets of the same thickness specification, and there may be a processing error between the thickness of the third conductive layer 2411 and the thickness of the first conductive layer 2431 .

[0236] In the above solution, the thickness of the third conductive layer 2411 is equal to the thickness of the first conductive layer 2431, which is convenient for processing and manufacturing.

[0237] According to some embodiments of the present application, the first connection portion 241 is a single-layer structure.

[0238] The first connection part 241 may be a sheet-like structure, and the thickness of the first connection part 241 may be greater than or equal to the maximum thickness of the multi-layer first conductive layer 2431 , so that the first connection part 241 may have a larger flow area, thereby facilitating the first adapter 24 to have a higher flow capacity.

[0239] In the above solution, the first connecting portion 241 is a single-layer structure with a simple structure, which is conducive to the flow of current.

[0240] According to some embodiments of the present application, the thickness of each first conductive layer 2431 is greater than or equal to 0.05 mm and less than or equal to 0.25 mm.

[0241] In some embodiments, the thickness of each first conductive layer 2431 is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

[0242] In some embodiments, the thickness of each first conductive layer 2431 is 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm or 0.25 mm, or any range between any two of them.

[0243] The first conductive layer 2431 may be formed by thinning a metal sheet. The thinner the first conductive layer 2431 is, the more difficult it is to manufacture.

[0244] In the above scheme, the thickness of each first conductive layer 2431 satisfies the above relationship (greater than or equal to 0.05 mm, and less than or equal to 0.25 mm). On the one hand, the processing and manufacturing difficulty is relatively low, and it is convenient for processing and manufacturing. On the other hand, the bending difficulty of the bending portion 243 is relatively low, which facilitates the bending of the first adapter 24.

[0245] According to some embodiments of the present application, the thickness of each first conductive layer 2431 is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

[0246] In some embodiments, the thickness of each first conductive layer 2431 is greater than or equal to 0.12 mm and less than or equal to 0.18 mm.

[0247] In the above scheme, when the thickness of each first conductive layer 2431 is greater than or equal to 0.1 mm, the first conductive layer 2431 has a thicker thickness, further reducing the difficulty of processing and manufacturing; when the thickness of each first conductive layer 2431 is less than or equal to 0.2 mm, the first conductive layer 2431 has a lower strength, further reducing the difficulty of bending the bending portion 243.

[0248] According to some embodiments of the present application, the first adapter 24 is made of copper, and the maximum thickness of the bent portion 243 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0249] The first adapter 24 is made of copper, and the first tab 22 a is made of copper, so as to facilitate welding of the first adapter 24 and the first tab 22 a.

[0250] When the material of the first adapter 24 is copper, the maximum thickness of the bending portion 243 can be any one of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, or a range between any two of them.

[0251] The maximum thickness of the bent portion 243 may be the thickness of a region of the bent portion 243 where the weakened portion 244 is not provided.

[0252] In the present application, the maximum thickness of the bent portion 243 may be the sum of the thicknesses of all first conductive layers 2431 .

[0253] In the above scheme, the material of the first adapter 24 is copper, which has good conductivity. The maximum thickness of the bending portion 243 satisfies the above relationship (greater than or equal to 0.4 mm, and less than or equal to 1.5 mm). On the one hand, the bending portion 243 has a larger flow area, and the first adapter 24 has a higher current capacity. On the other hand, it is easy to connect the first adapter 24 with the first electrode terminal 23a and the first pole ear 22a.

[0254] According to some embodiments of the present application, the maximum thickness of the bent portion 243 is greater than or equal to 0.6 mm and less than or equal to 1.2 mm.

[0255] In some embodiments, the maximum thickness of the bent portion 243 is greater than or equal to 0.7 mm and less than or equal to 1.1 mm.

[0256] In the above scheme, when the maximum thickness of the bending portion 243 is greater than or equal to 0.6 mm, the bending portion 243 has a larger flow area, further improving the flow capacity of the first adapter 24; when the maximum thickness of the bending portion 243 is less than or equal to 1.2 mm, the strength of the bending portion 243 is relatively low, further reducing the bending difficulty of the bending portion 243.

[0257] According to some embodiments of the present application, the first adapter 24 is made of aluminum, and the maximum thickness of the bent portion 243 is greater than or equal to 0.4 mm and less than or equal to 1.8 mm.

[0258] The material of the first adapter 24 is aluminum, and the material of the first tab 22 a can also be aluminum, so as to facilitate welding of the first adapter 24 and the first tab 22 a.

[0259] When the material of the first adapter 24 is aluminum, the maximum thickness of the bending portion 243 can be any one of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm, or a range between any two of them.

[0260] In the above scheme, the material of the first adapter 24 is aluminum, which has low cost and low density, and aluminum has good processing performance; the maximum thickness of the bending portion 243 satisfies the above relationship (greater than or equal to 0.4 mm, and less than or equal to 1.8 mm). On the one hand, the bending portion 243 has a larger flow area, and the first adapter 24 can have a higher flow capacity. On the other hand, the strength of the bending portion 243 is relatively low, which facilitates the bending of the bending portion 243.

[0261] According to some embodiments of the present application, the maximum thickness of the bent portion 243 is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0262] In some embodiments, the maximum thickness of the bent portion 243 is greater than or equal to 0.9 mm and less than or equal to 1.3 mm.

[0263] In the above scheme, when the maximum thickness of the bending portion 243 is greater than or equal to 0.7 mm, the bending portion 243 has a larger flow area, further improving the flow capacity of the first adapter 24; when the maximum thickness of the bending portion 243 is less than or equal to 1.5 mm, the strength of the bending portion 243 is relatively low, further reducing the bending difficulty of the bending portion 243.

[0264] According to some embodiments of the present application, the number of first conductive layers 2431 is greater than or equal to 10 and less than or equal to 12; the thickness of each first conductive layer 2431 is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

[0265] When the number of first conductive layers 2431 is greater than or equal to 10 and less than or equal to 12, the number of first conductive layers 2431 can be any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm or 0.15 mm, or a range between any two of them.

[0266] In the above scheme, the number of first conductive layers 2431 and the thickness of each first conductive layer 2431 satisfy the above relationship. On the one hand, when the thickness of each first conductive layer 2431 is greater than or equal to 0.05 mm, it is convenient to process and manufacture the first conductive layer 2431. On the other hand, when the thickness of each first conductive layer 2431 is less than or equal to 0.15 mm, the overall thickness of the bending portion 243 is thinner, and the bending difficulty of the bending portion 243 is lower, which facilitates the bending of the first adapter 24.

[0267] According to some embodiments of the present application, the minimum cross-sectional area of ​​the bending portion 243 is H1, and the minimum cross-sectional area of ​​the first connecting portion 241 is H2, satisfying 0.1*H2≤H1≤0.5*H2.

[0268] The cross-sectional area of ​​the bend portion 243 may be the area of ​​a cross section of the bend portion 243 cut by a plane parallel to the width direction K of the first adapter 24. In some embodiments, the cross-sectional area of ​​the bend portion 243 may be the flow area of ​​the bend portion 243. For example, the cross-sectional area of ​​the bend portion 243 is the thickness of the bend portion 243 multiplied by the size of the bend portion 243 in the width direction K of the first adapter 24. When the first conductive layer 2431 is provided with a through hole, the size of the bend portion 243 in the width direction K of the first adapter 24 needs to be subtracted from the size of the through hole in the width direction K of the first adapter 24.

[0269] The cross-sectional area of ​​the first connection portion 241 may be the area of ​​a cross section of the first connection portion 241 cut by a plane parallel to the width direction K of the first adapter 24. In some embodiments, the cross-sectional area of ​​the first connection portion 241 may be the flow area of ​​the bent portion 243.

[0270] In some embodiments, the ratio H1 / H2 of H1 to H2 may be any one of 0.1, 0.2, 0.3, 0.4 or 0.5, or a range between any two of them.

[0271] In the above scheme, the minimum value of the cross-sectional area of ​​the bending portion 243 and the minimum value of the cross-sectional area of ​​the first connecting portion 241 satisfy the above relationship (0.1*H2≤H1≤0.5*H2). On the one hand, the bending difficulty of the first adapter 24 can be reduced, and on the other hand, the bending portion 243 has a higher current flow capacity.

[0272] According to some embodiments of the present application, 0.2*H2≤H1≤0.4*H2.

[0273] In some embodiments, 0.25*H2≤H1≤0.35*H2.

[0274] In the above scheme, when H1≥0.2*H2, the cross-sectional area of ​​the bending portion 243 is larger, further improving the flow capacity of the bending portion 243; when H1≤0.4*H2, the strength of the bending portion 243 is lower, further reducing the bending difficulty of the bending portion 243.

[0275] Please refer to Fig.11 According to some embodiments of the present application, the first adapter 24 includes a plurality of conductive sheets 24a arranged in a stacked manner, each conductive sheet 24a includes a first conductive layer 2431, a second conductive layer 2421 and a third conductive layer 2411 that are integrally formed, the multiple layers of the first conductive layer 2431 form a bending portion 243, the multiple layers of the second conductive layer 2421 form a second connecting portion 242, and the multiple layers of the third conductive layer 2411 form a first connecting portion 241.

[0276] The conductive sheet 24a is a conductive metal sheet with good conductive properties.

[0277] The third conductive layer 2411, the first conductive layer 2431 and the second conductive layer 2421 are three regions of the conductive sheet 24a. The third conductive layer 2411, the first conductive layer 2431 and the second conductive layer 2421 can be distributed in sequence along the length direction of the conductive sheet 24a. After the multiple conductive sheets 24a are stacked and bent, the multiple layers of the third conductive layer 2411 form the first connecting portion 241, the multiple layers of the first conductive layer 2431 form the bending portion 243, and the multiple layers of the second conductive layer 2421 form the second connecting portion 242.

[0278] The third conductive layer 2411, the first conductive layer 2431 and the second conductive layer 2421 are an integrally formed structure. The thickness of the third conductive layer 2411, the thickness of the first conductive layer 2431 and the thickness of the second conductive layer 2421 may be equal. However, processing errors in the thickness of the third conductive layer 2411, the thickness of the first conductive layer 2431 and the thickness of the second conductive layer 2421 are allowed.

[0279] In the above scheme, the first adapter 24 is a multi-layer structure, and the first conductive layer 2431, the second conductive layer 2421 and the third conductive layer 2411 are integrally formed, which is easy to process and manufacture, and the first conductive layer 2431 is firmly connected to the second conductive layer 2421 and the third conductive layer 2411.

[0280] According to some embodiments of the present application, the thickness of each conductive sheet 24 a in the plurality of conductive sheets 24 a is equal.

[0281] During the manufacturing process, the plurality of conductive sheets 24a can be manufactured in batches, for example, a continuous strip of conductive metal sheet is cut into a plurality of conductive sheets 24a, and the plurality of conductive sheets 24a are stacked to form the first adapter 24, so that the thickness of each conductive sheet 24a in the plurality of conductive sheets 24a is equal. It should be noted that the thickness of each conductive sheet 24a is equal means that it is approximately equal, and a manufacturing error is allowed.

[0282] In the above solution, the thickness of each conductive sheet 24a in the plurality of conductive sheets 24a is equal, which is convenient for batch processing and manufacturing, and the processing cost is low.

[0283] According to some embodiments of the present application, two adjacent conductive sheets 24 a among the plurality of conductive sheets 24 a are welded or connected by conductive glue.

[0284] After the plurality of conductive sheets 24 a are stacked, the plurality of conductive sheets 24 a may be fixedly connected, for example, two adjacent conductive sheets 24 a among the plurality of conductive sheets 24 a may be welded or connected by conductive glue.

[0285] When two adjacent conductive sheets 24a are welded or connected by conductive adhesive, the two ends of the bending portion 243 connected to the first connecting portion 241 and the second connecting portion 242 can be connected so that the bending portion 243 has higher flexibility and is easy to bend.

[0286] In the above solution, two adjacent conductive sheets 24a among the plurality of conductive sheets 24a are welded or connected by conductive adhesive to facilitate electrical connection between the plurality of conductive sheets 24a, so that the first adapter 24 has a higher current carrying capacity.

[0287] According to some embodiments of the present application, the battery cell 20 further includes a first insulating member 25 , which wraps at least a portion of the surface of the electrode assembly 22 to separate the electrode assembly 22 from the housing 21 .

[0288] For example, the first insulating member 25 may be an insulating film wrapped around the outer surface of the electrode assembly 22 , such as a Mylar film.

[0289] Optionally, the housing 21 includes a shell 21 a and an end cover 21 b , and the first insulating member 25 may be disposed between the electrode assembly 22 and the shell 21 a .

[0290] Please refer to Fig.12 and Fig.13 , Fig.12 A schematic diagram of the structural decomposition of a battery cell provided in some other embodiments of the present application, Fig.13 A schematic diagram of the structure of a battery cell provided for some other embodiments of the present application. According to some embodiments of the present application, the housing 21 includes a shell 21a and an end cover 21b, the shell 21a has an opening, the end cover 21b covers the opening, and the end cover 21b is a first wall 211; the electrode assembly 22 also has a second pole ear 22b, and the polarity of the second pole ear 22b is opposite to the polarity of the first pole ear 22a; the battery cell 20 also includes a second electrode terminal 23b, the second electrode terminal 23b is provided on the end cover 21b or the shell 21a, and the second electrode terminal 23b is electrically connected to the second pole ear 22b.

[0291] The shell 21a and the end cover 21b are separately provided, which is convenient for processing and manufacturing.

[0292] The first electrode tab 22a may be a positive electrode tab, and the second electrode tab 22b may be a negative electrode tab; or, the first electrode tab 22a may be a negative electrode tab, and the second electrode tab 22b may be a positive electrode tab.

[0293] The polarity of the second electrode tab 22b is opposite to the polarity of the first electrode tab 22a. Fig.10 , the second electrode tab 22b can be located on the same side of the electrode assembly 22 as the first electrode tab 22a; or, please refer to Fig.11 The second electrode tab 22 b and the first electrode tab 22 a may be located on both sides of the electrode assembly 22 . For example, the second electrode tab 22 b and the first electrode tab 22 a may be located on two adjacent sides or two opposite sides of the electrode assembly 22 .

[0294] In some embodiments, when the second electrode tab 22 b and the first electrode tab 22 a are located on the same side of the electrode assembly 22 , the second electrode terminal 23 b may be disposed on the end cap 21 b .

[0295] In some embodiments, when the second electrode tab 22 b and the first electrode tab 22 a are located on both sides of the electrode assembly 22 , the second electrode terminal 23 b may be disposed on the housing 21 a .

[0296] In some embodiments, the second electrode terminal 23 b may be directly welded to the second electrode tab 22 b , or the second electrode terminal 23 b may be electrically connected to the second electrode tab 22 b via a second adapter 27 .

[0297] In the above solution, the end cap 21b is the first wall 211, which facilitates the assembly of the first electrode terminal 23a and the first wall 211, facilitates the connection between the first adapter 24 and the first electrode terminal 23a, and facilitates the assembly of the battery cell 20. When the second electrode terminal 23b is arranged on the end cap 21b, the second electrode tab 22b and the first electrode tab 22a can be located on the same side of the electrode assembly 22, which facilitates the connection between the second electrode terminal 23b and the first electrode terminal 23a and the electrode assembly 22; when the second electrode terminal 23b is arranged on the housing 21a, the second electrode terminal 23b and the first electrode terminal 23a are arranged flexibly, which facilitates the connection between the battery cell 20 and other components.

[0298] Please refer to Fig.14 and Fig.15 , Fig.14 A schematic diagram of a structural decomposition of a battery cell from one perspective provided in some embodiments of the present application, Fig.15 A schematic diagram of the structure of a battery cell from another perspective provided for some embodiments of the present application. According to some embodiments of the present application, the housing 21 includes a first end cap 21c, a shell 21a, and a second end cap 21d, the shell 21a has two openings arranged opposite to each other, the first end cap 21c and the second end cap 21d cover the two openings respectively, and the first end cap 21c is a first wall 211; the electrode assembly 22 also has a second pole ear 22b, and the polarity of the second pole ear 22b is opposite to the polarity of the first pole ear 22a; the battery cell 20 also includes a second electrode terminal 23b, the second electrode terminal 23b is arranged on the second end cap 21d, and the second electrode terminal 23b is electrically connected to the second pole ear 22b.

[0299] The first end cover 21 c and the second end cover 21 d respectively cover the two openings of the housing 21 a , and the first end cover 21 c and the second end cover 21 d are respectively connected to the housing 21 a to separate the inside and the outside of the battery cell 20 .

[0300] The electrode assembly 22 includes a main body 220, a first pole ear 22a and a second pole ear 22b. The main body 220 has a first edge 220a and a second edge 220b that are relatively arranged along the thickness direction Z of the first wall. The first edge 220a is closer to the first end cover 21c than the second edge 220b, and the second edge 220b is closer to the second end cover 21d than the first edge 220a. The first pole ear 22a extends from the first edge 220a, and the second pole ear 22b extends from the second edge 220b.

[0301] The second electrode tab 22 b and the first electrode tab 22 a are distributed at two opposite ends of the electrode assembly 22 in the thickness direction Z of the first wall, so as to output or input current from or to the two opposite ends of the electrode assembly 22 in the thickness direction Z of the first wall.

[0302] When the battery cell 20 is assembled, the first pole tab 22a is connected to the first electrode terminal 23a provided on the first end cover 21c through the first adapter 24, and the second pole tab 22b is connected to the second electrode terminal 23b provided on the second end cover 21d. The first electrode terminal 23a and the second electrode terminal 23b are arranged opposite to each other in the thickness direction Z of the first wall, which can reduce the risk of short circuit between the positive and negative electrodes.

[0303] In some embodiments, the second electrode terminal 23 b may be directly welded to the second electrode tab 22 b , or the second electrode terminal 23 b may be electrically connected to the second electrode tab 22 b via a second adapter 27 .

[0304] In the above scheme, the second electrode terminal 23b is arranged on the second end cover 21d, and the first end cover 21c and the second end cover 21d are arranged opposite to each other. The first end cover 21c and the second end cover 21d can be assembled with the shell 21a from both ends of the shell 21a respectively, so as to improve the assembly flexibility of the battery cell 20 and facilitate the assembly of the battery cell 20.

[0305] According to some embodiments of the present application, the structure of the second adapter 27 is the same as that of the first adapter 24, and the second adapter 27 may also be a bent structure. The assembly method of the second adapter 27 with the second electrode terminal 23b and the second tab 22b may refer to the assembly method of the first adapter 24 with the first electrode terminal 23a and the first tab 22a.

[0306] In some embodiments, the second transition component 27 is also formed by a multi-layer conductive sheet 24 a.

[0307] According to some embodiments of the present application, the battery cell 20 also includes a third insulating member 29, which is arranged on the side of the second end cover 21d facing the interior of the battery cell 20, and the third insulating member 29 is used to separate the electrode assembly 22 and the second end cover 21d to reduce the risk of short circuit between the electrode assembly 22 and the second end cover 21d.

[0308] Please refer to Fig.16 , Fig.16Schematic diagram of assembly of electrode assembly and first adapter provided for some embodiments of the present application. According to some embodiments of the present application, the electrode assembly 22 has two first pole tabs 22a; the first adapter 24 includes two second connection parts 242 and two bending parts 243, the two second connection parts 242 are arranged at intervals along the thickness direction Y of the electrode assembly, each second connection part 242 is connected to the first connection part 241 through a bending part 243, and each first pole tab 22a is connected to a second connection part 242.

[0309] When the electrode assembly 22 is a wound structure, the electrode assembly 22 includes a straight region, and the pole pieces of the straight region are stacked along the thickness direction Y of the electrode assembly. When the electrode assembly 22 is a laminated structure, the pole pieces of the electrode assembly 22 are stacked along the thickness direction Y of the electrode assembly.

[0310] In some embodiments, when the number of electrode assemblies 22 is one, all first sub-electrode tabs 221 of the electrode assembly 22 are divided into two first electrode tabs 22a in the stacking direction. When the number of electrode assemblies 22 is an even number (such as two, four, etc.), the first sub-electrode tabs 221 of half of the electrode assemblies 22 in the even number of electrode assemblies 22 form one first electrode tab 22a, and the first sub-electrode tabs 221 of the other half of the electrode assemblies 22 form another first electrode tab 22a.

[0311] The electrode assembly 22 can be provided with a larger number of first sub-pole ears 221, all of which are divided into two first pole ears 22a, and two second connecting parts 242 are arranged at intervals along the thickness direction Y of the electrode assembly, so as to facilitate the connection between the first pole ears 22a and the second connecting parts 242 at both ends of the thickness direction Y of the electrode assembly, thereby facilitating the improvement of the energy density of the battery cell 20.

[0312] In the above scheme, when the electrode assembly 22 is provided with a plurality of first sub-pole ears 221, the battery cell 20 can have a higher energy density, and the plurality of first sub-pole ears 221 can be divided into two first pole ears 22a, and the two first pole ears 22a can be spaced apart along the thickness direction Y of the electrode assembly to facilitate the gathering of the plurality of first sub-pole ears 221; the first adapter 24 includes two second connecting portions 242, each second connecting portion 242 is connected to the first connecting portion 241 through a bending portion 243, so as to facilitate the connection between the first pole ear 22a and the first adapter 24; at the same time, the setting of the two second connecting portions 242 and the two bending portions 243 facilitates the dispersion of the stress of the two first pole ears 22a, and reduces the risk of cracking of the first pole ears 22a.

[0313] According to some embodiments of the present application, the housing 21 is in the shape of a cuboid.

[0314] In the above solution, the outer shell 21 is a rectangular parallelepiped, which has high strength and is convenient for stacking a plurality of battery cells 20 , so as to improve the energy density of the battery device 100 formed by the battery cells 20 .

[0315] In some embodiments, the housing 21 may be a steel shell or an aluminum shell, and the battery cell 20 may be a hard shell battery cell.

[0316] According to some embodiments of the present application, the battery cell 20 further includes a pressure relief mechanism 28 , which is disposed in the housing 21 a and can be actuated to release the internal pressure of the battery cell 20 .

[0317] The pressure relief mechanism 28 may be a notch provided on the housing 21 a , or the pressure relief mechanism 28 may be an explosion-proof valve provided on the housing 21 a .

[0318] In some embodiments, when the battery cell 20 thermally runs away, the pressure relief mechanism 28 can be actuated to release the internal pressure of the battery cell 20. The actuation of the pressure relief mechanism 28 may include but is not limited to at least partial structural destruction of the pressure relief mechanism 28, opening of the valve core of the pressure relief mechanism 28, etc.

[0319] In some embodiments, the housing 21a includes two first side walls 212 disposed oppositely along the first direction X and two second side walls 213 disposed oppositely along the second direction, and opposite ends of the first side wall 212 in the second direction are respectively connected to the two second side walls 213, and the two first side walls 212 and the two second side walls 213 enclose a space for accommodating the electrode assembly 22. The second direction is parallel to the thickness direction Y of the electrode assembly.

[0320] Optionally, the surface area of ​​the first side wall 212 is smaller than the surface area of ​​the second side wall 213 , and the pressure relief mechanism 28 is disposed on the first side wall 212 .

[0321] In some embodiments, a thickness direction Z of the first wall may be parallel to a length direction of the battery cell 20 .

[0322] According to some embodiments of the present application, an embodiment of the present application further provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0323] According to some embodiments of the present application, an electrical device is further provided, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, and the battery cell 20 or the battery device 100 is used to provide electrical energy.

[0324] The power-consuming device may be any of the above-mentioned devices or systems using the battery cell 20 or the battery device 100 as a power source.

[0325] According to some embodiments of this application, please refer to Figures 3 to 11 , Fig.14 and Fig.15 The embodiment of the present application provides a battery cell 20 , which includes a housing 21 , a first electrode terminal 23 a , an electrode assembly 22 , a first adapter 24 , a second electrode terminal 23 b and a second adapter 27 .

[0326] The outer shell 21 is a rectangular parallelepiped, and includes a shell body 21a, a first end cover 21c and a second end cover 21d. The shell body 21a has two openings arranged opposite to each other. The first end cover 21c and the second end cover 21d respectively close the two openings. The first end cover 21c is a first wall 211.

[0327] The first electrode terminal 23 a is disposed on the first wall 211 , and the second electrode terminal 23 b is disposed on the second end cover 21 d .

[0328] The electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 includes a main body 220, a first pole ear 22a and a second pole ear 22b. The main body 220 has a first edge 220a and a second edge 220b that are relatively arranged along the thickness direction Z of the first wall. The first edge 220a is closer to the first wall 211 than the second edge 220b, and the second edge 220b is closer to the second end cover 21d than the first edge 220a; the first pole ear 22a extends from the first edge 220a, and the second pole ear 22b extends from the second edge 220b, so as to output or input electric energy at both ends of the thickness direction Z of the first wall.

[0329] The first adapter 24 is a bent structure, and includes a first connection portion 241, a second connection portion 242, and a bent portion 243. The first connection portion 241 is welded to the first electrode terminal 23a, the second connection portion 242 is welded to the first electrode tab 22a, and the bent portion 243 connects the first connection portion 241 and the second connection portion 242. When the first adapter 24 is unfolded, the first connection portion 241, the bent portion 243, and the second connection portion 242 are sequentially distributed along the length direction L of the first adapter 24. On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first connection portion 241 and the orthographic projection of the second connection portion 242 at least partially overlap. The first adapter 24 includes a plurality of conductive sheets 24a stacked together, and the first pole ear 22a is sandwiched between the plurality of conductive sheets 24a; each conductive sheet 24a includes a first conductive layer 2431, a second conductive layer 2421 and a third conductive layer 2411 formed as one piece, the plurality of first conductive layers 2431 form a bending portion 243, the plurality of second conductive layers 2421 form a second connecting portion 242, and the plurality of third conductive layers 2411 form a first connecting portion 241.

[0330] According to the battery cell 20 of the embodiment of the present application, the first adapter 24 includes a plurality of conductive sheets 24a, and the first adapter 24 is a bending structure, so that the first adapter 24 connecting the first electrode terminal 23a and the first pole ear 22a is a buffer structure, which can buffer the force generated by the movement of the electrode assembly 22 caused by the vibration of the battery cell 20, can disperse the stress of the first pole ear 22a, and can reduce the risk of fatigue cracking of the first pole ear 22a.

[0331] In some embodiments, the number of layers of the first conductive layer 2431 is less than the number of layers of the third conductive layer 2411; the number of layers of the first conductive layer 2431 is less than the number of layers of the second conductive layer 2421. The number of layers of the first conductive layer 2431 is small, and the bending portion 243 is less difficult to bend, so that the first adapter 24 can be bent easily.

[0332] In some embodiments, at least one first conductive layer 2431 is provided with a weakened portion 244, and the number of the weakened portions 244 is multiple, and the multiple weakened portions 244 are arranged at intervals along the width direction K of the first adapter 24, and the bending portion 243 has a first end face 243a and a second end face 243b that are arranged opposite to each other along the width direction K of the first adapter 24, and the multiple weakened portions 244 include a first weakened portion 244a and a second weakened portion 244b, and one end of the first weakened portion 244a extends to the first end face 243a, and one end of the second weakened portion 244b extends to the second end face 243b. The arrangement of the first weakened portion 244a and the second weakened portion 244b, on the one hand, can reduce the strength of the first adapter 24 at the bending portion 243, so as to facilitate the bending of the first adapter 24; on the other hand, the difficulty of processing and manufacturing is low, and processing and manufacturing are convenient, and at the same time, the heat dissipation area can be increased, so as to facilitate the heat dissipation of the first adapter 24.

[0333] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; A first electrode terminal, disposed on the first wall; An electrode assembly is disposed in the housing, and the electrode assembly has a first electrode tab; A first adapter, comprising a first connecting portion, a second connecting portion and a bent portion, wherein the first connecting portion is electrically connected to the first electrode terminal, the second connecting portion is electrically connected to the first electrode tab, the bent portion connects the first connecting portion and the second connecting portion, and an orthographic projection of the first connecting portion and an orthographic projection of the second connecting portion at least partially overlap on the same projection plane perpendicular to the thickness direction of the first wall; Wherein, the bending portion includes at least two first conductive layers stacked together.

2. The battery cell according to claim 1, characterized in that: At least one of the first conductive layers is provided with a weakened portion.

3. The battery cell according to claim 2, characterized in that: The weakened portion includes at least one of a through hole, a groove, and a notch.

4. The battery cell according to claim 2, characterized in that: The weakened portion is arranged on the inner side of the bent portion.

5. The battery cell according to claim 2, characterized in that: When the first adapter is in an unfolded state, the first connecting portion, the bending portion and the second connecting portion are sequentially distributed along the length direction of the first adapter; The length direction of the weakened portion is parallel to the width direction of the first adapter.

6. The battery cell according to claim 5, characterized in that: There are multiple weakened portions, and the multiple weakened portions are arranged at intervals along the width direction of the first adapter.

7. The battery cell according to claim 6, characterized in that: The bending portion has a first end face and a second end face which are arranged opposite to each other along the width direction of the first adapter. The plurality of weakened portions include a first weakened portion and a second weakened portion. One end of the first weakened portion extends to the first end face, and one end of the second weakened portion extends to the second end face.

8. The battery cell according to claim 1, characterized in that: The second connecting portion includes a plurality of second conductive layers stacked together, and the first electrode tab is sandwiched between the plurality of second conductive layers.

9. The battery cell according to claim 8, characterized in that: The number of the first conductive layers is less than or equal to the number of the second conductive layers.

10. The battery cell according to claim 9, characterized in that: Each layer of the first conductive layer is integrally formed with a layer of the second conductive layer.

11. The battery cell according to claim 10, characterized in that: The thickness of the second conductive layer is equal to the thickness of the first conductive layer.

12. The battery cell according to claim 8, characterized in that: The first electrode tab includes a plurality of first sub-electrode tabs stacked in layers, and the plurality of first sub-electrode tabs are sandwiched between two adjacent second conductive layers.

13. The battery cell according to claim 8, characterized in that: The number of layers of the second conductive layer of the second connecting portion located on both sides of the first electrode tab is equal.

14. The battery cell according to claim 1, characterized in that: The first connecting portion includes at least two third conductive layers stacked together.

15. The battery cell according to claim 14, characterized in that: The number of layers of the first conductive layer is less than or equal to the number of layers of the third conductive layer.

16. The battery cell according to claim 15, characterized in that: Each layer of the first conductive layer is integrally formed with a layer of the third conductive layer.

17. The battery cell according to claim 16, characterized in that: The thickness of the third conductive layer is equal to the thickness of the first conductive layer.

18. The battery cell according to claim 1, characterized in that: The first connecting portion is a single-layer structure.

19. The battery cell according to claim 1, characterized in that: The thickness of each first conductive layer is greater than or equal to 0.05 mm and less than or equal to 0.25 mm.

20. The battery cell according to claim 19, characterized in that: The thickness of each first conductive layer is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

21. The battery cell according to claim 1, characterized in that: The first adapter is made of copper, and the maximum thickness of the bent portion is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

22. The battery cell according to claim 21, characterized in that: The maximum thickness of the bent portion is greater than or equal to 0.6 mm and less than or equal to 1.2 mm.

23. The battery cell according to claim 1, characterized in that: The first adapter is made of aluminum, and the maximum thickness of the bent portion is greater than or equal to 0.4 mm and less than or equal to 1.8 mm.

24. The battery cell according to claim 23, characterized in that: The maximum thickness of the bent portion is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

25. The battery cell according to claim 1, characterized in that The number of layers of the first conductive layer is greater than or equal to 10 and less than or equal to 12; The thickness of each first conductive layer is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

26. The battery cell according to claim 1, characterized in that: The minimum value of the cross-sectional area of ​​the bending portion is H1, and the minimum value of the cross-sectional area of ​​the first connecting portion is H2, satisfying 0.1*H2≤H1≤0.5*H2.

27. The battery cell according to claim 26, characterized in that: 0.2*H2≤H1≤0.4*H2.

28. The battery cell according to claim 1, characterized in that: The first adapter includes a plurality of conductive sheets stacked together, each of the conductive sheets includes the first conductive layer, the second conductive layer and the third conductive layer formed integrally, the multiple layers of the first conductive layer form the bending portion, the multiple layers of the second conductive layer form the second connecting portion, and the multiple layers of the third conductive layer form the first connecting portion.

29. The battery cell according to claim 28, characterized in that: The thickness of each of the plurality of conductive sheets is equal.

30. The battery cell according to claim 28, characterized in that Two adjacent conductive sheets among the plurality of conductive sheets are connected by welding or by conductive adhesive.

31. The battery cell according to any one of claims 1 to 30, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall; The electrode assembly further comprises a second electrode tab, wherein the polarity of the second electrode tab is opposite to the polarity of the first electrode tab; The battery cell further includes a second electrode terminal, which is disposed on the end cover or the housing, and is electrically connected to the second electrode tab.

32. The battery cell according to any one of claims 1 to 30, characterized in that: The housing comprises a first end cover, a shell and a second end cover, the shell has two openings arranged opposite to each other, the first end cover and the second end cover cover the two openings respectively, and the first end cover is the first wall; The electrode assembly further comprises a second electrode tab, wherein the polarity of the second electrode tab is opposite to the polarity of the first electrode tab; The battery cell further includes a second electrode terminal, which is disposed on the second end cover and is electrically connected to the second electrode tab.

33. The battery cell according to any one of claims 1 to 30, characterized in that: The electrode assembly has two first electrode tabs; The first adapter includes two second connecting parts and two bending parts, the two second connecting parts are arranged at intervals along the thickness direction of the electrode assembly, each second connecting part is connected to the first connecting part through a bending part, and each first electrode ear is connected to one second connecting part.

34. The battery cell according to any one of claims 1 to 30, characterized in that: The shell is in the shape of a rectangular parallelepiped.

35. A battery device, characterized in that: Comprising the battery cell according to any one of claims 1-34.

36. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 34 or the battery device according to claim 35, wherein the battery cell or the battery device is used to provide electrical energy.

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