Battery cell, battery, and electric device

Abstract

Disclosed in the present application are a battery cell, a battery and an electric device. The battery cell comprises: a housing, an electrode assembly, an electrode lead-out member, and an insulating bracket. The electrode assembly is accommodated in the housing and comprises a main body portion and a first tab, the first tab extending out through the end of the main body portion in a first direction. The electrode lead-out member is arranged on the housing and is electrically connected to the first tab. The insulating bracket is accommodated in the housing and is arranged in the first direction with the main body portion, a portion of the insulating bracket is located between the electrode lead-out member and the housing, and the insulating bracket is provided with a first accommodating recess on the side facing the main body portion, at least part of the first tab extending into the first accommodating recess. By means of the provision of the insulating bracket, the embodiments of the present application can improve reliability.

Description

Battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 202311454200.X, filed on November 03, 2023, entitled “Battery Cell, Battery, and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Battery cells are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0005] In the development of battery technology, how to improve the reliability of battery cells is a research direction in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device, which can improve reliability.

[0008] In a first aspect, the present application provides a battery cell comprising a housing, an electrode assembly, an electrode lead-out member, and an insulating bracket. The electrode assembly is housed within the housing and comprises a main body and a first tab, the first tab extending from an end of the main body along a first direction. The electrode lead-out member is disposed within the housing and electrically connected to the first tab. The insulating bracket is housed within the housing and disposed along the first direction with the main body, with a portion of the insulating bracket positioned between the electrode lead-out member and the housing. A first accommodating recess is provided on a side of the insulating bracket facing the main body, with at least a portion of the first tab extending into the first accommodating recess.

[0009] The insulating bracket can accommodate and contain the first tab, reducing the risk of the first tab being inserted backwards into the main body, and can separate at least a portion of the first tab from the outer casing to reduce the risk of short circuits. The electrode lead-out member and the outer casing can limit the insulating bracket, thereby reducing the shaking of the insulating bracket relative to the outer casing when the battery cell is subjected to external impact, reducing the risk of the insulating bracket impacting the outer casing and the risk of the outer casing rupturing, and improving the reliability of the battery cell.

[0010] In some embodiments, the first tab is bent within the first accommodating recess. By bending the first tab, the space occupied by the first tab in the first direction can be reduced, thereby improving space utilization. Because the first tab is bent within the first accommodating recess, the insulating bracket can isolate the bent portion of the first tab from the outer shell, thereby reducing the risk of the first tab contacting the outer shell during bending and deformation.

[0011] In some embodiments, the first electrode tab includes a first portion, a bent portion, and a second portion. The first portion is connected to the main body and the electrode lead. The bent portion extends from an end of the first portion away from the main body and is bent relative to the first portion, and the bent portion is accommodated in the first accommodating recess. The second portion extends from an end of the bent portion away from the first portion toward the main body.

[0012] The first electrode tab is bent back in the first accommodating recess so that the first portion and the second portion share a space in the first direction, thereby improving space utilization and increasing the energy density of the battery cell.

[0013] In some embodiments, the insulating bracket includes an insulating base, a first limiting plate, and a second limiting plate. The insulating base is spaced apart from the main body along a first direction. The first limiting plate and the second limiting plate are located on a side of the insulating base facing the main body and spaced apart along a second direction, with the first direction being perpendicular to the second direction. The first receiving recess is located between the first limiting plate and the second limiting plate.

[0014] The first limiting plate and the second limiting plate can limit and insulate the first tab, thereby reducing the risk of conduction between the first tab and the housing and improving reliability.

[0015] In some embodiments, the thickness of the second limiting plate is greater than the thickness of the first limiting plate.

[0016] The second limiting plate needs to withstand the stress generated by bending the first tab. Therefore, the second limiting plate can be thicker than the first limiting plate to provide effective support for the first tab and reduce the risk of deformation of the second limiting plate. The first limiting plate mainly serves as an insulator and can be thinner than the second limiting plate to reduce the weight of the insulating bracket.

[0017] In some embodiments, the second limiting plate supports the first tab to shape the first tab.

[0018] In some embodiments, in the first direction, an end of the first limiting plate facing the main body extends beyond an end of the second limiting plate facing the main body, and insulates the first tab from the housing.

[0019] The first limiting plate may have a larger size in the first direction than the second limiting plate to insulate the first tab from the housing and reduce the risk of short circuit. The second limiting plate may have a smaller size in the first direction than the first limiting plate to reduce the weight of the insulating bracket.

[0020] In some embodiments, the first limiting plate protrudes from the insulating substrate in the first direction by a dimension D1, and the second limiting plate protrudes from the insulating substrate in the first direction by a dimension D2. D1 and D2 satisfy the following: 0.3≤D2 / D1≤0.7.

[0021] D2 / D1 is limited to be greater than or equal to 0.3 to increase the contact area between the second limiting plate and the first tab and improve the supporting effect. In the embodiment of the present application, D2 / D1 is limited to be greater than or equal to 0.7 to reduce the volume and weight of the second limiting plate.

[0022] In some embodiments, the electrode lead-out member includes a first connecting plate connected to the first electrode tab, the first connecting plate being located between the main body and the insulating substrate in a first direction, and an end of the first connecting plate remote from the main body being located between the first limiting plate and the second limiting plate in a second direction. The first electrode tab is bent within the first accommodating recess along the end of the first connecting plate remote from the main body.

[0023] The first connecting plate can guide the first electrode tab to bend and realize electrical connection between the first electrode tab and the electrode lead-out piece.

[0024] In some embodiments, the electrode lead-out member further includes a second connecting plate connected to an end of the first connecting plate close to the main body, and the second connecting plate separates the end of the first electrode tab from the main body in the first direction.

[0025] The second connecting plate can separate the main body from the end of the first tab in the first direction, so as to reduce the risk of the first tab being inserted into the main body and improve the reliability of the battery cell.

[0026] In some embodiments, the housing includes a first housing wall, the electrode assembly and the insulating bracket are located on the same side of the first housing wall along the second direction, and the first limiting plate is located on a side of the second limiting plate facing away from the first housing wall. The electrode lead-out member further includes a third connecting plate and an electrode terminal, the third connecting plate being located on a side of the first connecting plate facing the first housing wall, the second connecting plate connecting the first connecting plate and the third connecting plate, and the electrode terminal connecting the third connecting plate and extending through the first housing wall.

[0027] The third connecting plate, the second connecting plate, and the first connecting plate form a receiving space to accommodate at least part of the first tab, reducing the risk of the first tab contacting the outer shell. The electrode terminal passes through the first shell wall to conduct current to the outside of the battery cell.

[0028] In some embodiments, the first connecting plate, the second connecting plate, the third connecting plate and the electrode terminal are an integrally formed structure, thereby simplifying the structure of the electrode lead-out member, simplifying the assembly process, and improving the current flow capacity.

[0029] In some embodiments, the housing includes a first housing wall, and the insulating bracket is located on a side of the first housing wall along the second direction. The insulating bracket also includes a third limiting plate, the third limiting plate being located on a side of the second limiting plate facing the first housing wall and connected to the insulating substrate, and the first limiting plate being located on a side of the second limiting plate facing away from the first housing wall. In the second direction, at least a portion of the third limiting plate is located between the first housing wall and the electrode lead-out member.

[0030] By providing the third limiting plate, the first shell wall and the electrode lead-out member can limit the insulating bracket in the second direction. The electrode lead-out member can utilize the space between the second limiting plate and the third limiting plate, thereby improving space utilization.

[0031] In some embodiments, in the first direction, one end of the second limiting plate facing the main body exceeds one end of the third limiting plate facing the main body. The third limiting plate may have a smaller size in the first direction, which can reduce the weight of the insulating bracket.

[0032] In some embodiments, the battery cell further includes an insulating member, at least a portion of which is located between the housing and the electrode lead-out member.

[0033] Insulation can be used to insulate the housing and electrode leads to reduce the risk of short circuits.

[0034] In some embodiments, the insulating bracket is connected to the insulating member, and the insulating member can limit the position of the insulating bracket, thereby improving the stability of the insulating bracket.

[0035] In some embodiments, an insulating recess is provided at one end of the insulating member away from the main body along the first direction, and at least a portion of the insulating bracket is inserted into the insulating recess.

[0036] During assembly, the insulating bracket can cooperate with the insulating recess to achieve positioning of the insulating member and the insulating bracket, thereby improving assembly efficiency and accuracy.

[0037] In some embodiments, the portion of the insulating bracket inserted into the insulating recess is interference-engaged between the housing and the insulating member in a second direction, where the second direction is perpendicular to the first direction. This interference-engagement method can improve the stability of the insulating bracket and reduce the risk of the insulating bracket being dislodged from the insulating recess when the battery cell is subjected to external impact.

[0038] In some embodiments, the insulating bracket abuts against the main body in the first direction, thereby limiting the main body in the first direction and reducing movement of the main body in the housing when the battery cell is subjected to external impact, thereby improving the cycle performance of the battery cell.

[0039] In some embodiments, the housing is provided with an injection hole. The insulating bracket is provided with an injection channel, which communicates with the space between the main body and the insulating bracket. The peripheral wall of the injection channel includes a drainage wall. The injection hole and the drainage wall are opposite in the axial direction of the injection hole, and the injection channel is located on the side of the drainage wall facing the injection hole.

[0040] The drainage wall of the insulating bracket can withstand the impact of the electrolyte and guide the electrolyte to flow in the injection channel, thereby reducing the direct impact of the electrolyte on the main body and reducing the deformation of the isolation piece.

[0041] In some embodiments, the injection channel forms an injection opening on a surface of the insulating bracket facing the main body, so that the electrolyte can flow out through the injection opening and infiltrate the main body, thereby improving the infiltration efficiency.

[0042] In some embodiments, a second accommodating recess is provided on a side of the insulating bracket facing the main body, the second accommodating recess being arranged along the second direction with the first accommodating recess. The liquid injection channel is located on one side of the second accommodating recess along the third direction and communicates with the second accommodating recess, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0043] The second accommodating recess and the liquid injection channel can change the flow direction of the electrolyte, reduce the direct impact on the main body, reduce the risk of deformation of the isolation piece of the main body, and improve reliability.

[0044] In some embodiments, the insulating bracket has multiple accommodating recesses on a side facing the main body. The multiple accommodating recesses are arranged along a second direction perpendicular to the first direction. One of the multiple accommodating recesses is a first accommodating recess. The sum of the dimensions of the multiple accommodating recesses along the second direction is D3, and the dimension of the insulating bracket along the second direction is D4. D3 and D4 satisfy the following: 0.3 ≤ D3 / D4 ≤ 0.7.

[0045] A larger D3 / D4 ratio increases the hollow portion of the insulating bracket, reducing the weight of the insulating bracket and increasing the energy density of the battery cell. Of course, a larger D3 / D4 ratio also decreases the structural strength of the insulating bracket. In this embodiment, D3 / D4 is limited to 0.3-0.7. This allows the hollow portion of the insulating bracket to be increased, the weight of the insulating bracket to be reduced, and the energy density of the battery cell to be increased, while ensuring the structural strength of the insulating bracket meets the requirements.

[0046] In some embodiments, the electrode assembly further includes a second electrode tab having a polarity opposite to that of the first electrode tab. The first electrode tab and the second electrode tab extend from an end of the main body along the first direction and are spaced apart along a third direction perpendicular to the first direction. A third accommodating recess is defined on a side of the insulating bracket facing the main body. The third accommodating recess is spaced apart from the first accommodating recess along the third direction. At least a portion of the second electrode tab extends into the third accommodating recess.

[0047] The insulating bracket is provided with a first accommodating recess for accommodating the first pole tab and a third accommodating recess for accommodating the second pole tab, so as to reduce the risk of short circuit, simplify the structure of the battery cell, and increase the energy density of the battery cell.

[0048] In some embodiments, the housing includes a first housing wall and a second housing wall disposed opposite each other along a second direction, with the main body located between the first housing wall and the second housing wall, and the second direction being perpendicular to the first direction. The housing includes a first recessed portion, the first recessed portion being recessed toward the first housing wall relative to an outer surface of the second housing wall. The electrode lead-out member includes a terminal plate located on a side of the first housing wall facing away from the second housing wall. In the second direction, a projection of the terminal plate is located within a projection of the first recessed portion.

[0049] By providing a terminal plate to facilitate electrical connection with an external conductive structure, the current carrying capacity is improved. When multiple battery cells are arranged along the second direction, the first recess of one battery cell can avoid the terminal plate of another battery cell, thereby improving space utilization and increasing the energy density of the battery.

[0050] In some embodiments, in the second direction, a projection of the insulating support at least partially overlaps with a projection of the first recess.

[0051] The insulating bracket can support the bottom wall of the first recess, reduce the risk of the bottom wall of the first recess collapsing inward, and isolate the bottom wall of the first recess from the first tab, thereby reducing the risk of short circuit and improving reliability.

[0052] In some embodiments, the housing includes a shell and a cover plate disposed opposite to each other along the second direction, the shell has an opening, and the cover plate covers the opening. The cover plate includes a first shell wall, and the shell includes a second shell wall.

[0053] In some embodiments, the size of the housing along the first direction is L1, the size of the housing along the second direction is L2, and the size of the housing along the third direction is L3. The first direction, the second direction, and the third direction are perpendicular to each other. 3≤L1 / L3≤7, 2≤L3 / L2≤7.

[0054] On the premise that the volume of the battery cell is certain, limiting L1 / L3 to 3-7 and limiting L3 / L2 to 2-7 can balance the space utilization of the battery cell in the first direction and the current carrying capacity of the first tab, reduce the temperature rise of the battery cell, reduce the risk of deformation of the battery cell when subjected to external impact, and improve the reliability and cycle performance of the battery cell.

[0055] In a second aspect, the present application provides a battery comprising a plurality of battery cells provided by any embodiment of the first aspect.

[0056] In a third aspect, the present application provides an electrical device comprising the battery of the second aspect, the battery being used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0058] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0059] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application;

[0060] FIG3 is a schematic structural diagram of batteries provided in other embodiments of the present application;

[0061] FIG4 is a schematic cross-sectional view of a battery cell provided in some embodiments of the present application;

[0062] FIG5 is an enlarged schematic diagram of the frame in FIG4 ;

[0063] FIG6 is a schematic diagram of an insulating bracket of a battery cell provided in some embodiments of the present application at one viewing angle;

[0064] FIG7 is a schematic diagram of the insulating bracket shown in FIG6 from another perspective;

[0065] FIG8 is a schematic cross-sectional view taken along the AA direction of FIG7;

[0066] FIG9 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0067] FIG10 is a partial cross-sectional schematic diagram of the battery cell shown in FIG9 ;

[0068] FIG11 is a schematic cross-sectional view of an insulating bracket of a battery cell provided in some other embodiments of the present application;

[0069] FIG12 is a schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0070] FIG13 is a schematic structural diagram of the insulating bracket shown in FIG12;

[0071] FIG14 is a schematic structural diagram of an electrode assembly of a battery cell provided in some embodiments of the present application.

[0072] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0073] The reference numerals are as follows:

[0074] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Housing; 5a. First housing portion; 5b. Second housing portion; 5c. Accommodation space; 6. Battery cell; 7. Converging member;

[0075] 10. Electrode assembly; 11. Main body; 12. First tab; 121. First portion; 122. Bend portion; 123. Second portion; 124. Folding portion; 13. Second tab;

[0076] 20. Outer shell; 21. First shell wall; 211. Liquid injection hole; 212. Pressure relief mechanism; 22. Second shell wall; 23. First recess; 24. Second recess; 20a. Shell; 20b. Cover plate;

[0077] 30. Electrode lead-out member; 31. First connecting plate; 32. Second connecting plate; 33. Third connecting plate; 34. Electrode terminal; 35. Terminal plate; 351. First terminal portion; 352. Second terminal portion;

[0078] 40. Insulating bracket; 40a. First accommodating recess; 40b. Second accommodating recess; 40c. Third accommodating recess; 40d. Liquid injection channel; 40e. Liquid injection opening; 41. Insulating substrate; 42. First limiting plate; 43. Second limiting plate; 44. Third limiting plate; 45. Partition; 46. Support block; 47. Drainage wall;

[0079] 50, insulating member; 50a, insulating recess;

[0080] 60. First sealing member;

[0081] 70. Second sealing member;

[0082] X, first direction; Z, second direction; Y, third direction. DETAILED DESCRIPTION

[0083] Below, the embodiments of the battery cell, battery, and electrical device of the present application are described in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structure are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0084] " range " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameters, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, the numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0085] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, and such technical solutions should be considered to be included in the disclosure of the present application.

[0086] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0087] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0088] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0089] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0090] In this application, the terms "plurality" and "multiple" refer to two or more.

[0091] Unless otherwise stated, the numerical values ​​of the various parameters mentioned in this application can be measured using various test methods commonly used in the art, for example, they can be measured according to the test methods given in the examples of this application. Unless otherwise stated, the test temperature of each parameter is 25°C.

[0092] 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.

[0093] A battery cell typically includes an electrode assembly, which includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. For example, the electrode assembly also includes a separator disposed between the positive and negative electrodes. The separator can, to a certain extent, prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0094] Battery cells may include, 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-acid batteries, and the like.

[0095] 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 or a polygonal battery. The polygonal battery may be, for example, a hexagonal battery.

[0096] The battery cells may be hard-shell battery cells, soft-pack battery cells, or other types of battery cells.

[0097] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0098] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0099] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0100] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0101] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0102] Electrode assemblies typically have tabs that conduct current away from the assembly. When a battery cell is subjected to an external impact, these tabs can easily deform, creating the risk of the tabs contacting the outer casing or being inserted backwards into the electrode assembly, causing a short circuit and impacting the reliability of the battery cell.

[0103] In view of this, an embodiment of the present application provides a technical solution, which disposes an insulating bracket inside the battery cell to retract and accommodate the tabs, thereby reducing the risk of short circuit and improving the reliability of the battery cell.

[0104] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0105] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0106] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0107] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0108] As shown in FIG1 , a battery 2 is provided inside the vehicle 1. The battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1. For example, the battery 2 may serve as an operating power source for the vehicle 1.

[0109] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0110] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0111] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application.

[0112] As shown in FIG. 2 , the battery 2 includes a housing 5 and a battery cell 6 , and the battery cell 6 is accommodated in the housing 5 .

[0113] The housing 5 is used to accommodate the battery cells 6 and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other and together define a storage space 5c for accommodating the battery cells 6. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. The first housing portion 5a and the second housing portion 5b can also both be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0114] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0115] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0116] In the battery 2, there can be one or more battery cells 6. If there are multiple battery cells 6, the multiple battery cells 6 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 6. The multiple battery cells 6 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 6 can be housed within the housing 5. Alternatively, multiple battery cells 6 can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 5.

[0117] FIG3 is a schematic structural diagram of batteries provided in other embodiments of the present application.

[0118] As shown in FIG3 , in some embodiments, the battery 2 includes a plurality of battery cells 6 and a plurality of busbar components 7 . The plurality of busbar components 7 can connect the plurality of battery cells 6 in series, in parallel, or in mixed connection.

[0119] FIG4 is a schematic cross-sectional view of a battery cell provided in some embodiments of the present application.

[0120] 4 , an embodiment of the present application provides a battery cell 6 , which includes a housing 20 and an electrode assembly 10 , wherein the electrode assembly 10 is accommodated in the housing 20 .

[0121] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 6, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. Optionally, the electrode assembly 10 also includes a separator disposed between the positive and negative electrodes. The separator can reduce the risk of short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0122] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0123] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0124] 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, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. 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.).

[0125] As an example, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active material layers may also be used. These positive electrode active material layers may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0126] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, a positive electrode active material layer may or may not be provided on the surface of the metal foam. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0127] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0128] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0129] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0130] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0131] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0132] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0133] In some embodiments, the separator includes 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.

[0134] As an example, the primary 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 particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0135] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0136] The housing 20 is a hollow structure, and its interior forms a space for accommodating the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a rectangular parallelepiped structure, a rectangular housing can be selected.

[0137] The housing 20 can be made of a variety of materials, for example, metal or plastic. Alternatively, the housing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the housing 20 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0138] As an example, the housing 20 includes a shell 20 a and a cover 20 b . The shell 20 a has an opening, and the cover 20 b is used to cover the opening.

[0139] The housing 20 a is a component used to cooperate with the cover plate 20 b to form an internal cavity of the battery cell 6 . The formed internal cavity can be used to accommodate the electrode assembly 10 , electrolyte, and other components.

[0140] The housing 20a and the cover 20b may be separate components. For example, an opening may be provided on the housing 20a, and the cover 20b may be placed over the opening to form an internal cavity of the battery cell 6.

[0141] The housing 20a can have various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the housing 20a can be determined according to the specific shape and size of the electrode assembly 10. The housing 20a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0142] The shape of the cover plate 20b can be adapted to the shape of the housing 20a to fit the housing 20a. The material of the cover plate 20b can be the same as or different from the material of the housing 20a. Optionally, the cover plate 20b can be made of a material with a certain hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). In this way, the cover plate 20b is less likely to deform when subjected to compression or collision, thereby providing the battery cell 6 with higher structural strength and improved reliability.

[0143] The cover plate 20b can be connected to the housing 20a by welding, bonding, clamping or other methods.

[0144] Figure 5 is an enlarged schematic diagram of the box in Figure 4; Figure 6 is a schematic diagram of the insulating bracket of the battery cell provided in some embodiments of the present application at one perspective; Figure 7 is a schematic diagram of the insulating bracket shown in Figure 6 at another perspective; Figure 8 is a cross-sectional schematic diagram of Figure 7 taken along the AA direction.

[0145] With reference to Figures 5 to 8 , in some embodiments, the battery cell 6 includes an electrode assembly 10, a housing 20, an electrode lead-out member 30, and an insulating bracket 40. The electrode assembly 10 is housed in the housing 20 and includes a main body 11 and a first electrode tab 12. The first electrode tab 12 extends from an end of the main body 11 along a first direction X. The electrode lead-out member 30 is disposed in the housing 20 and electrically connected to the first electrode tab 12. The insulating bracket 40 is housed in the housing 20 and disposed along the first direction X with the main body 11. A portion of the insulating bracket 40 is located between the electrode lead-out member 30 and the housing 20. A first accommodating recess 40a is provided on the side of the insulating bracket 40 facing the main body 11. At least a portion of the first electrode tab 12 extends into the first accommodating recess 40a.

[0146] The electrode assembly 10 is a component where electrochemical reactions occur in the battery cell 6. The housing 20 may contain one or more electrode assemblies 10. The electrode assembly 10 may be a wound structure, a laminate structure, a wound laminate composite structure, or other structures.

[0147] The shape of the electrode assembly 10 can be cylindrical, flat, or polygonal.

[0148] As an example, the electrode assembly 10 includes a first electrode sheet, a second electrode sheet, and a separator. The polarity of the first electrode sheet is opposite to that of the second electrode sheet, and the separator is used to insulate and isolate the first electrode sheet from the second electrode sheet. The first electrode sheet includes a first current collector and a first active material layer coated on the surface of the first current collector. The second electrode sheet includes a second current collector and a second active material layer coated on the surface of the second current collector. The main body 11 includes a portion of the first current collector coated with the first active material layer, a portion of the second current collector coated with the second active material layer, the first active material layer, and the second active material layer. The first electrode tab 12 includes a portion of the first current collector that is not coated with the first active material layer. One of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other is a negative electrode sheet.

[0149] The first electrode tab 12 extends from one end of the main body 11 along the first direction X. Alternatively, there may be two first electrode tabs 12 , which extend from both ends of the main body 11 along the first direction X respectively.

[0150] For example, the electrode lead-out member 30 may be used to electrically connect the electrode assembly 10 to the current outside the battery cell, thereby enabling charging and discharging of the battery cell.

[0151] The first electrode tab 12 may be directly connected to the electrode lead-out member 30 , or may be indirectly connected to the electrode lead-out member 30 through other conductive structures.

[0152] The electrode lead-out member 30 may be fixed to the housing 20. For example, the electrode lead-out member 30 may be fixed to the housing 20a or to the cover plate 20b.

[0153] The insulating bracket 40 may be provided with one first accommodating recess 40 a or may be provided with a plurality of first accommodating recesses 40 a.

[0154] The insulating bracket 40 can accommodate and contain the first electrode tab 12, reducing the risk of the first electrode tab 12 being inserted upside down into the main body 11, and at least partially separate the first electrode tab 12 from the outer shell 20 to reduce the risk of short circuits. The electrode lead 30 and the outer shell 20 can also limit the insulating bracket 40, thereby reducing the shaking of the insulating bracket 40 relative to the outer shell 20 when the battery cell 6 is subjected to external impact, reducing the risk of the insulating bracket 40 impacting the outer shell 20 and the risk of the outer shell 20 rupturing, thereby improving the reliability of the battery cell 6.

[0155] In some embodiments, the insulating bracket 40 is fixed to the housing 20. Optionally, the electrode lead-out member 30 and the housing 20 clamp a portion of the insulating bracket 40 to fix the insulating bracket 40 to the housing 20.

[0156] By fixing the insulating bracket 40 with the electrode lead-out member 30 , the structure of the battery cell can be simplified and the difficulty of installing the insulating bracket 40 can be reduced.

[0157] In some embodiments, the first tab 12 is bent in the first receiving recess 40 a.

[0158] In the embodiment of the present application, by bending the first electrode tab 12, the space occupied by the first electrode tab 12 in the first direction X can be reduced, thereby improving space utilization. Since the first electrode tab 12 is bent in the first accommodating recess 40a, the insulating bracket 40 can isolate the bent portion of the first electrode tab 12 from the housing 20, thereby reducing the risk of the first electrode tab 12 contacting the housing 20 during bending and deformation.

[0159] In some embodiments, the first tab 12 includes a first portion 121, a bent portion 122, and a second portion 123. The bent portion 122 extends from an end of the first portion 121 away from the main body 11 and is bent relative to the first portion 121. The bent portion 122 is received in the first receiving recess 40a. The second portion 123 extends from an end of the bent portion 122 away from the first portion 121 toward the main body 11.

[0160] The first electrode tab 12 is bent back in the first accommodating recess 40 a so that the first portion 121 and the second portion 123 share a common space in the first direction X, thereby improving space utilization and increasing the energy density of the battery cell.

[0161] In some embodiments, the first electrode tab 12 further includes a gathering portion 124 , and the gathering portion 124 is connected between the first portion 121 and the main body 11 .

[0162] Exemplarily, the first tab 12 includes a plurality of conductive layers stacked together. In the gathered portion 124 , the plurality of conductive layers converge toward the middle; and in the first portion 121 , the plurality of conductive layers are stacked and bonded together.

[0163] In some embodiments, the insulating bracket 40 includes an insulating base plate 41, a first limiting plate 42, and a second limiting plate 43. The insulating base plate 41 is spaced apart from the main body 11 along a first direction X. The first limiting plate 42 and the second limiting plate 43 are located on a side of the insulating base plate 41 facing the main body 11 and are spaced apart along a second direction Z. The first direction X is perpendicular to the second direction Z. The first accommodating recess 40a is located between the first limiting plate 42 and the second limiting plate 43.

[0164] The insulating substrate 41 , the first limiting plate 42 and the second limiting plate 43 are used to define the first accommodating recess 40 a .

[0165] The first limiting plate 42 and the second limiting plate 43 can limit and insulate the first electrode tab 12 , thereby reducing the risk of conduction between the first electrode tab 12 and the housing 20 and improving reliability.

[0166] In some embodiments, in the second direction Z, the bent portion 122 is located between the first limiting plate 42 and the second limiting plate 43 . The second portion 123 is located on a side of the first portion 121 close to the second limiting plate 43 .

[0167] In some embodiments, the thickness of the second limiting plate 43 is greater than the thickness of the first limiting plate 42 .

[0168] The second limiting plate 43 needs to withstand the stress generated by bending the first tab 12. Therefore, the second limiting plate 43 can be thicker than the first limiting plate 42 to provide effective support for the first tab 12 and reduce the risk of deformation of the second limiting plate 43. The first limiting plate 42 mainly serves as an insulator and can be thinner than the second limiting plate 43 to reduce the weight of the insulating bracket 40.

[0169] In some embodiments, the ratio of the thickness of the second limiting plate 43 to the thickness of the first limiting plate 42 is 1.2-3 to balance the strength and weight of the second limiting plate 43. When the strength of the second limiting plate 43 meets the requirements, the total weight of the insulating bracket 40 is reduced.

[0170] Optionally, the ratio of the thickness of the second limiting plate 43 to the thickness of the first limiting plate 42 is 1.5-2.

[0171] In some embodiments, the second limiting plate 43 supports the first electrode tab 12 to shape the first electrode tab 12 .

[0172] In some embodiments, the second limiting plate 43 supports the second portion 123 of the first tab 12 .

[0173] In some embodiments, in the first direction X, one end of the first limiting plate 42 facing the main body 11 extends beyond one end of the second limiting plate 43 facing the main body 11 , and insulates the first tab 12 from the housing 20 .

[0174] The first limiting plate 42 may have a larger size than the second limiting plate 43 in the first direction X to insulate the first tab 12 from the housing 20 and reduce the risk of short circuit. The second limiting plate 43 may have a smaller size than the first limiting plate 42 in the first direction X to reduce the weight of the insulating bracket 40.

[0175] In some embodiments, the first limiting plate 42 separates the first portion 121 from the housing 20 .

[0176] In some embodiments, the first limiting plate 42 protrudes from the insulating substrate 41 by a dimension D1 in the first direction X, and the second limiting plate 43 protrudes from the insulating substrate 41 by a dimension D2 in the first direction X. D1 and D2 satisfy: 0.3≤D2 / D1≤0.7.

[0177] Optionally, D2 / D1 is 0.3, 0.4, 0.5, 0.6 or 0.7.

[0178] In this embodiment, D2 / D1 is set to be greater than or equal to 0.3 to increase the contact area between the second limiting plate 43 and the first tab 12 and improve the support effect. In this embodiment, D2 / D1 is set to be greater than or equal to 0.7 to reduce the volume and weight of the second limiting plate 43.

[0179] In some embodiments, the electrode lead-out member 30 includes a first connecting plate 31 connected to the first electrode tab 12. The first connecting plate 31 is located between the main body 11 and the insulating substrate 41 in the first direction X. The end of the first connecting plate 31 away from the main body 11 is located between the first limiting plate 42 and the second limiting plate 43 in the second direction Z. The first electrode tab 12 is bent within the first accommodating recess 40a along the end of the first connecting plate 31 away from the main body 11.

[0180] The first connecting plate 31 can guide the first electrode tab 12 to bend and realize electrical connection between the first electrode tab 12 and the electrode lead-out member 30 .

[0181] In some embodiments, the electrode lead-out member 30 further includes a second connecting plate 32 connected to an end of the first connecting plate 31 close to the main body 11. The second connecting plate 32 separates the end of the first electrode tab 12 from the main body 11 in the first direction X.

[0182] The second connecting plate 32 can separate the main body 11 from the end of the first electrode tab 12 in the first direction X, so as to reduce the risk of the first electrode tab 12 being inserted into the main body 11 and improve the reliability of the battery cell 6 .

[0183] In some embodiments, the electrode lead-out member 30 includes a first connecting plate 31 and a second connecting plate 32. The first connecting plate 31 is located between the main body 11 and the insulating substrate 41 in the first direction X. In the second direction Z, at least a portion of the first connecting plate 31 is located between the first portion 121 and the second portion 123 and is electrically connected to the first portion 121. The second connecting plate 32 is connected to an end of the first connecting plate 31 close to the main body 11 and is located on a side of the first connecting plate 31 close to the second portion 123. The second connecting plate 32 separates the second portion 123 from the main body 11 in the first direction X.

[0184] The first connecting plate 31 can support the first portion 121 and achieve electrical connection between the first electrode tab 12 and the electrode lead-out member 30. The second connecting plate 32 can separate the main body 11 from the second portion 123 in the first direction X, thereby reducing the risk of the first electrode tab 12 being inserted into the main body 11 and improving the reliability of the battery cell 6.

[0185] In some embodiments, the first portion 121 is welded to the first connecting plate 31 .

[0186] In some embodiments, the multiple conductive layers of the second portion 123 are stacked and independent, and the second limiting plate 43 and the first connecting plate 31 can gather the multiple conductive layers of the second portion 123 from both sides to reduce the risk of the multiple conductive layers spreading out.

[0187] In some embodiments, in the second direction Z, the end of the first connecting plate 31 away from the main body 11 is located between the first limiting plate 42 and the second limiting plate 43. The first tab 12 is bent along the end of the first connecting plate 31 away from the main body 11 to form a bent portion 122. The second limiting plate 43 supports the second portion 123.

[0188] When the electrode assembly 10 and the insulating bracket 40 are assembled along the first direction X, the free end of the first electrode tab 12 can first extend into the first accommodating recess 40a, and then bend along the end of the first connecting plate 31 away from the main body 11 after being blocked by the insulating substrate 41.

[0189] The end of the first connecting plate 31 away from the main body 11 is located between the first limiting plate 42 and the second limiting plate 43, so that the bent portion 122 can be accommodated in the first accommodating recess 40a. In addition, the second limiting plate 43 can also support the end of the first connecting plate 31 away from the main body 11, reducing deformation of the first connecting plate 31.

[0190] In some embodiments, the housing 20 includes a first shell wall 21 , the electrode assembly 10 and the insulating bracket 40 are located on the same side of the first shell wall 21 along the second direction Z, and the first limiting plate 42 is located on the side of the second limiting plate 43 away from the first shell wall 21 .

[0191] In some embodiments, the electrode lead-out member 30 further includes a third connecting plate 33 and an electrode terminal 34, wherein the third connecting plate 33 is located on the side of the first connecting plate 31 facing the first shell wall 21, the second connecting plate 32 connects the first connecting plate 31 and the third connecting plate 33, and the electrode terminal 34 connects the third connecting plate 33 and passes through the first shell wall 21.

[0192] As an example, the first shell wall 21 may be a wall of the housing 20a, or may be at least a portion of the cover plate 20b. Optionally, the first shell wall 21 is a flat wall.

[0193] The electrode terminal 34 and the third connecting plate 33 may be integrally formed, or may be connected to the third connecting plate 33 by welding, riveting or other methods.

[0194] There may be one or more electrode terminals 34 .

[0195] The third connecting plate 33, the second connecting plate 32, and the first connecting plate 31 form a receiving space to accommodate at least a portion of the first electrode tab 12, thereby reducing the risk of contact between the first electrode tab 12 and the outer shell 20. The electrode terminal 34 passes through the first shell wall 21 to conduct current to the outside of the battery cell 6.

[0196] In some embodiments, the second portion 123 can be accommodated in the accommodation space surrounded by the third connecting plate 33 , the second connecting plate 32 , and the first connecting plate 31 .

[0197] In some embodiments, the third connecting plate 33 , the second connecting plate 32 , and the first connecting plate 31 form an integrated C-shaped structure.

[0198] In some embodiments, the first connecting plate 31 , the second connecting plate 32 , the third connecting plate 33 and the electrode terminal 34 are an integrally formed structure, thereby simplifying the structure of the electrode lead-out member 30 , simplifying the assembly process, and improving the current flow capacity.

[0199] In some embodiments, the electrode lead-out member 30 further includes a terminal plate 35, which is located on a side of the first shell wall 21 away from the first electrode tab 12 and is connected to the electrode terminal 34. The terminal plate 35 facilitates electrical connection with an external conductive structure and improves current carrying capacity.

[0200] For example, the terminal plate 35 can be used to connect with the busbar component. Optionally, the terminal plate 35 and the busbar component are arranged along the first direction X and connected.

[0201] In some embodiments, the terminal plate 35 includes a first terminal portion 351 and a second terminal portion 352 . The first terminal portion 351 is connected to the electrode terminal 34 , and the second terminal portion 352 is protruded from a surface of the first terminal portion 351 facing away from the first housing wall 21 .

[0202] Both the first terminal portion 351 and the second terminal portion 352 can be used to connect to the busbar component. By providing the second terminal portion 352, the connection area between the terminal plate 35 and the busbar component can be increased.

[0203] In some embodiments, an end surface of the first terminal portion 351 facing the busbar along the first direction X is flush with an end surface of the second terminal portion 352 facing the busbar along the first direction X.

[0204] In some embodiments, the electrode terminal 34 is riveted to the terminal plate 35 . For example, the electrode terminal 34 is riveted to the first terminal portion 351 .

[0205] In some embodiments, the housing 20 includes a first housing wall 21, and the insulating bracket 40 is located on one side of the first housing wall 21 along the second direction Z. The insulating bracket 40 also includes a third limiting plate 44, which is located on the side of the second limiting plate 43 facing the first housing wall 21 and connected to the insulating base plate 41. The first limiting plate 42 is located on the side of the second limiting plate 43 away from the first housing wall 21. In the second direction Z, at least a portion of the third limiting plate 44 is located between the first housing wall 21 and the electrode lead-out member 30.

[0206] The third limiting plate 44 is provided so that the first shell wall 21 and the electrode lead-out member 30 can limit the insulating bracket 40 in the second direction Z. The electrode lead-out member 30 can utilize the space between the second limiting plate 43 and the third limiting plate 44, thereby improving space utilization.

[0207] In some embodiments, at least a portion of the third connecting plate 33 is located between the second limiting plate 43 and the third limiting plate 44 .

[0208] In some embodiments, at least a portion of the third limiting plate 44 is located between the first housing wall 21 and the third connecting plate 33. For example, the first housing wall 21 and the third connecting plate 33 clamp the third limiting plate 44 in the second direction Z to fix the insulating bracket 40 to the first housing wall 21.

[0209] In some embodiments, the third limiting plate 44 , the second limiting plate 43 , and the insulating substrate 41 define a second accommodating recess 40 b , and at least a portion of the third connecting plate 33 is disposed in the second accommodating recess 40 b .

[0210] The first accommodation recess 40 a and the second accommodation recess 40 b are arranged along the second direction Z.

[0211] In some embodiments, in the first direction X, an end of the second limiting plate 43 facing the main body 11 extends beyond an end of the third limiting plate 44 facing the main body 11 .

[0212] The third limiting plate 44 may have a smaller size in the first direction X, which can reduce the weight of the insulating bracket 40 and reduce the risk of interference between the third limiting plate 44 and the electrode terminal 34 .

[0213] In some embodiments, the thickness of the third limiting plate 44 is less than that of the second limiting plate 43. By reducing the thickness of the third limiting plate 44, the space occupied by the third limiting plate 44 in the second direction Z and the weight of the third limiting plate 44 can be reduced, thereby improving the energy density of the battery cell.

[0214] In some embodiments, the battery cell 6 further includes an insulating member 50, at least a portion of which is located between the housing 20 and the electrode lead 30. The insulating member 50 can be used to insulate the housing 20 and the electrode lead 30 to reduce the risk of short circuit.

[0215] In some embodiments, the insulating bracket 40 is connected to the insulating member 50 .

[0216] For example, the third limiting plate 44 may be connected to the insulating member 50 by welding, bonding, abutting or other methods.

[0217] The insulating member 50 can limit the insulating support 40 , thereby improving the stability of the insulating support 40 .

[0218] In some embodiments, the electrode lead-out member 30 fixes the insulating member 50 to the first housing wall 21 .

[0219] In some embodiments, an insulating recess 50 a is defined at one end of the insulating member 50 away from the main body 11 along the first direction X, and at least a portion of the insulating bracket 40 is inserted into the insulating recess 50 a .

[0220] During assembly, the insulating bracket 40 can cooperate with the insulating recess 50 a to achieve positioning of the insulating member 50 and the insulating bracket 40 , thereby improving assembly efficiency and accuracy.

[0221] In some embodiments, the insulating recess 50 a is disposed at an end of the insulating member 50 along the first direction X close to the insulating substrate 41 .

[0222] In some embodiments, at least a portion of the third limiting plate 44 is inserted into the insulating recess 50 a.

[0223] In some embodiments, the insulating recess 50a is recessed from the surface of the insulating member 50 that is in contact with the first shell wall 21. One end of the insulating recess 50a along the second direction Z may be open, which can simplify the molding process of the insulating recess 50a.

[0224] In some embodiments, the portion of the insulating bracket 40 inserted into the insulating recess 50a is interference-engaged between the housing 20 and the insulating member 50 in the second direction Z. This interference-engaging method can improve the stability of the insulating bracket 40 and reduce the risk of the insulating bracket 40 being dislodged from the insulating recess 50a when the battery cell 6 is subjected to external impact.

[0225] In some embodiments, the third limiting plate 44 is partially inserted into the insulating recess 50 a and is interference-engaged between the first shell wall 21 and the insulating member 50 .

[0226] In some embodiments, the insulating bracket 40 abuts against the main body 11 in the first direction X. The insulating bracket 40 can limit the main body 11 in the first direction X, thereby reducing movement of the main body 11 within the housing 20 when the battery cell 6 is subjected to external impact, thereby improving the cycle performance of the battery cell 6.

[0227] In some embodiments, the insulating bracket 40 abuts against the isolation member of the main body 11 .

[0228] In some embodiments, the insulating bracket 40 includes two support blocks 46. In the third direction Y, the first limiting plate 42, the second limiting plate 43, and the third limiting plate 44 are disposed between the two support blocks 46 and connected to the two support blocks 46. Exemplarily, the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0229] The first limiting plate 42 , the second limiting plate 43 , the insulating substrate 41 and the two supporting blocks 46 jointly define a first accommodating recess 40 a .

[0230] By providing the support block 46, the structural strength of the insulating bracket 40 can be improved.

[0231] In some embodiments, a lightening hole is provided inside the support block 46 to reduce the weight of the support block. The lightening hole can also accommodate electrolyte.

[0232] In some embodiments, in the first direction X, one end of the support block 46 facing the main body 11 extends beyond the first limiting plate 42 , the second limiting plate 43 , and the third limiting plate 44 to abut against the main body 11 .

[0233] In some embodiments, the insulating support 40 has multiple accommodating recesses on a side facing the main body 11. The multiple accommodating recesses are arranged along a second direction Z, which is perpendicular to the first direction X. One of the multiple accommodating recesses is a first accommodating recess 40a. The sum of the dimensions of the multiple accommodating recesses along the second direction Z is D3, and the dimension of the insulating support 40 along the second direction Z is D4. D3 and D4 satisfy the following: 0.3 ≤ D3 / D4 ≤ 0.7.

[0234] A larger D3 / D4 ratio increases the hollow portion of the insulating bracket 40, reducing the weight of the insulating bracket 40 and increasing the energy density of the battery cell. Of course, a larger D3 / D4 ratio also decreases the structural strength of the insulating bracket 40. In this embodiment, D3 / D4 is limited to 0.3-0.7. This allows the hollow portion of the insulating bracket 40 to be increased, the weight of the insulating bracket 40 to be reduced, and the energy density of the battery cell to be increased, while ensuring that the structural strength of the insulating bracket 40 meets the requirements.

[0235] In some embodiments, D3 / D4 may be 0.3, 0.4, 0.5, 0.6, or 0.7.

[0236] In some embodiments, the insulating support 40 is provided with two accommodating recesses, ie, a first accommodating recess 40 a and a second accommodating recess 40 b .

[0237] The dimension of the first accommodating recess 40 a along the second direction Z is D31 , and the dimension of the second accommodating recess 40 b along the second direction Z is D32 . D3 = D31 + D32 .

[0238] In some embodiments, the housing 20 includes a first shell wall 21 and a second shell wall 22 oppositely arranged along a second direction Z, the main body 11 is located between the first shell wall 21 and the second shell wall 22, and the second direction Z is perpendicular to the first direction X.

[0239] The first wall 21 is a wall of the housing 20 having a certain thickness, and the second wall 22 is a wall of the housing 20 having a certain thickness. The first wall 21 and the second wall 22 are spaced apart along the second direction Z.

[0240] The first shell wall 21 can be in various shapes, such as circular, rectangular, square or other shapes. The second shell wall 22 can be in various shapes, such as circular, rectangular, square or other shapes.

[0241] The first shell wall 21 can be a flat wall or a curved wall with a certain curvature. The second shell wall 22 can be a flat wall or a curved wall with a certain curvature.

[0242] For example, the area of ​​the first shell wall 21 can be the area of ​​the projection of the first shell wall 21 along the second direction Z, and the area of ​​the second shell wall 22 can be the area of ​​the projection of the second shell wall 22 along the second direction Z. The area of ​​the second shell wall 22 can be equal to the area of ​​the first shell wall 21. For example, the second shell wall 22 and the first shell wall 21 have the same shape and size. Alternatively, the area of ​​the second shell wall 22 can be smaller than the area of ​​the first shell wall 21.

[0243] In some embodiments, the housing 20 has a first recess 23 that is recessed relative to the outer surface of the second housing wall 22 toward the first housing wall 21. The electrode lead 30 includes a terminal plate 35 located on a side of the first housing wall 21 facing away from the second housing wall 22. In the second direction Z, the projection of the terminal plate 35 is located within the projection of the first recess 23.

[0244] The terminal plate 35 is provided to facilitate electrical connection with an external conductive structure, thereby improving the current carrying capacity. When multiple battery cells 6 are arranged along the second direction Z, the first recess 23 of one battery cell 6 can avoid the terminal plate 35 of another battery cell 6, thereby improving space utilization and increasing the energy density of the battery.

[0245] In some embodiments, at least a portion of the first electrode tab 12 is located between the bottom wall of the first recess 23 and the first shell wall 21 in the second direction Z. The first electrode tab 12 requires less space in the second direction Z. Therefore, the first recess 23 can be provided on the outer side of the shell 20, which can reduce the volume of the battery cell 6 and improve the volume energy density of the battery cell 6.

[0246] In some embodiments, in the second direction Z, a projection of the insulating support 40 at least partially overlaps with a projection of the first recess 23 .

[0247] The insulating bracket 40 can support the bottom wall of the first recess 23, reduce the risk of the bottom wall of the first recess 23 collapsing inward, and isolate the bottom wall of the first recess 23 from the first tab 12, thereby reducing the risk of short circuit and improving reliability.

[0248] In some embodiments, the first recess 23 passes through the housing 20 along the third direction Y.

[0249] In some embodiments, the area of ​​the second shell wall 22 is smaller than the area of ​​the first shell wall 21 .

[0250] In some embodiments, the electrode assembly 10 further includes a second electrode tab 13, and the first electrode tab 12 and the second electrode tab 13 have opposite polarities. Exemplarily, the second electrode tab 13 includes a portion of the second current collector that is not coated with the second active material layer.

[0251] The second electrode tab 13 and the first electrode tab 12 may extend from the same end of the main body 11 along the first direction X, or may extend from two ends of the main body 11 along the first direction X respectively.

[0252] In some embodiments, the first electrode tab 12 and the second electrode tab 13 extend from both ends of the main body 11 along the first direction X, respectively, to reduce the risk of short circuit caused by contact between the first electrode tab 12 and the second electrode tab 13 .

[0253] The first electrode tab 12 and the second electrode tab 13 extend from both ends of the main body 11 along the first direction X, respectively, and the two can share space in the third direction Y. Therefore, the first electrode tab 12 can have a larger size in the third direction Y, thereby improving the current flow capacity of the first electrode tab 12 and reducing the temperature rise of the first electrode tab 12.

[0254] In some embodiments, the housing 20 has a second recess 24 at its end along the first direction X. The second recess 24 is recessed relative to the surface of the second wall 22 facing away from the first wall 21. The first recess 23 and the second recess 24 are located on both sides of the second wall 22 along the first direction X.

[0255] In some embodiments, in the second direction Z, at least a portion of the second electrode tab 13 is located between the bottom wall of the second recess 24 and the first shell wall 21 .

[0256] For example, the electrode lead-out member electrically connected to the first electrode tab 12 may be referred to as a first electrode lead-out member. The battery cell 6 further includes a second electrode lead-out member electrically connected to the second electrode tab 13.

[0257] When two battery cells 6 are arranged along the second direction Z and need to be connected in parallel, the first recess 23 of one battery cell 6 can avoid the first electrode lead of the other battery cell 6 , and the second recess 24 of the one battery cell 6 can avoid the second electrode lead of the other battery cell 6 .

[0258] When two battery cells 6 are arranged along the second direction Z and need to be connected in series, the first recess 23 of one battery cell 6 can avoid the second electrode lead-out piece of the other battery cell 6 , and the second recess 24 of the one battery cell 6 can avoid the first electrode lead-out piece of the other battery cell 6 .

[0259] In some embodiments, the housing 20 includes a shell 20 a and a cover 20 b disposed opposite to each other along the second direction Z. The shell 20 a has an opening, and the cover 20 b covers the opening. The cover 20 b includes a first shell wall 21 , and the shell 20 a includes a second shell wall 22 .

[0260] The housing 20a and the cover plate 20b can be covered with each other to form a receiving space for receiving the electrode assembly. The housing 20a and the cover plate 20b are easy to form and assemble.

[0261] In some embodiments, the insulating bracket 40 is fixed to the cover plate 20 b.

[0262] In some embodiments, the housing 20a is welded to the cover plate 20b.

[0263] In some embodiments, the housing 20a and the cover 20b are both made of metal. Metal has high strength and good thermal conductivity. Using metal housing 20a and cover 20b can improve the cycle performance of the battery cell 6 and enhance the reliability of the battery cell 6.

[0264] In some embodiments, the electrode assembly is a laminate structure.

[0265] In some embodiments, the electrode assembly 10 includes multiple first pole pieces and multiple second pole pieces, the polarity of the first pole pieces is opposite to the polarity of the second pole pieces, and the multiple first pole pieces and the multiple second pole pieces are alternately stacked along the second direction Z.

[0266] The electrode assembly 10 adopts a laminated structure, which can improve space utilization and increase the energy density of the battery cell.

[0267] In some embodiments, the first recess 23 and the second recess 24 are provided on the housing 20 a.

[0268] In some embodiments, the thickness of the shell 20 a is 0.1 mm-0.8 mm to balance the strength and weight of the shell 20 a , improve the reliability of the battery cell 6 , and increase the energy density of the battery cell 6 .

[0269] Optionally, the thickness of the shell 20a is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm.

[0270] In some embodiments, the thickness of the housing 20a is 0.2 mm to 0.5 mm.

[0271] In some embodiments, the size of the housing 20 along the first direction X is L1, the size of the housing 20 along the second direction Z is L2, and the size of the housing 20 along the third direction Y is L3. 3≤L1 / L3≤7, 2≤L3 / L2≤7.

[0272] The first tab 12 extends from the end of the main body 11 along the first direction X, and it will occupy additional space in the first direction X. The larger L1 is, the smaller the size of the first tab 12 in the first direction X is, and the higher the space utilization rate of the battery cell in the first direction X is.

[0273] The first electrode tab 12 and the main body 11 may share a space in the third direction Y. The larger L3 is, the larger the flow area of ​​the first electrode tab 12 is, the better the flow capacity of the first electrode tab 12 is, and the lower the heat generation is.

[0274] L2 can be the thickness of the battery cell. The smaller L2 is, the shorter the path for the main body 11 to dissipate heat upward is, and the lower the temperature rise of the battery cell 6 during charging and discharging is. However, the smaller L2 is, the thinner the battery cell is, and the battery cell 6 is more likely to be deformed when subjected to external impact during the production, transportation and use of the battery cell 6.

[0275] On the premise that the volume of the battery cell is certain, limiting L1 / L3 to 3-7 and limiting L3 / L2 to 2-7 can balance the space utilization of the battery cell in the first direction X and the current carrying capacity of the first pole ear 12, reduce the temperature rise of the battery cell, reduce the risk of deformation of the battery cell 6 when subjected to external impact, and improve the reliability and cycle performance of the battery cell 6.

[0276] Optionally, L1 / L3 is 3, 4, 5, 6 or 7.

[0277] Optionally, L3 / L2 is 2, 3, 4, 5, 6 or 7.

[0278] FIG9 is a schematic diagram of a battery cell provided in some embodiments of the present application; FIG10 is a schematic diagram of a partial cross-section of the battery cell shown in FIG9 .

[0279] 9 and 10 , in some embodiments, the housing 20 is provided with a liquid injection hole 211. During the production of the battery cell, electrolyte can be injected into the housing 20 through the liquid injection hole 211.

[0280] There can be one or more liquid injection holes 211 .

[0281] In some embodiments, the insulating bracket 40 is provided with an injection channel 40d, which communicates with the space between the main body 11 and the insulating bracket 40. The peripheral wall of the injection channel 40d includes a drainage wall 47. In the axial direction of the injection hole 211, the injection hole 211 and the drainage wall 47 are opposite each other, and the injection channel 40d is located on the side of the drainage wall 47 facing the injection hole 211.

[0282] The drainage wall 47 of the insulating bracket 40 can withstand the impact of the electrolyte and guide the electrolyte to flow in the injection channel 40d, thereby reducing the direct impact of the electrolyte on the main body 11 and reducing the deformation of the isolation member.

[0283] In some embodiments, the injection channel 40d forms an injection opening 40e on the surface of the insulating bracket 40 facing the main body 11. The electrolyte can flow out through the injection opening 40e and infiltrate the main body 11, thereby improving the infiltration efficiency.

[0284] In some embodiments, the injection channel 40d is disposed on a support block 46. The support block 46 includes a drainage wall 47.

[0285] In some embodiments, the liquid injection hole 211 is disposed on the first shell wall 21 .

[0286] In some embodiments, the battery cell 6 includes a first sealing member 60 . The first sealing member 60 is connected to the first shell wall 21 and covers the liquid injection hole 211 from the outside to seal the liquid injection hole 211 .

[0287] Exemplarily, the first sealing member 60 is welded to the first housing wall 21 .

[0288] In some embodiments, the battery cell 6 includes a second sealing member 70 , which is inserted into the liquid injection hole 211 and has an interference fit with the liquid injection hole 211 .

[0289] Exemplarily, the second sealing member 70 includes a rubber stud.

[0290] In some embodiments, the first shell wall 21 is provided with a pressure relief mechanism 212. There can be one or more pressure relief mechanisms 212.

[0291] FIG11 is a schematic cross-sectional view of an insulating bracket of a battery cell provided in some other embodiments of the present application.

[0292] As shown in Figures 5 and 11, in some embodiments, a second accommodating recess 40b is provided on a side of the insulating bracket 40 facing the main body 11. The second accommodating recess 40b and the first accommodating recess 40a are arranged along the second direction Z. The injection channel 40d is located on one side of the second accommodating recess 40b along the third direction Y and is connected to the second accommodating recess 40b. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0293] The second accommodating recess 40 b and the liquid injection channel 40 d can change the flow direction of the electrolyte, reduce the direct impact on the main body 11 , reduce the risk of deformation of the isolation member of the main body 11 , and improve reliability.

[0294] Illustratively, the injection channel 40 d is formed in a support block 46 .

[0295] The second accommodating recess 40 b is opposite to the main body 11 in the first direction X, and has a larger flow area, which can improve the infiltration efficiency of the electrolyte and reduce the impact on the main body 11 .

[0296] Figure 12 is a cross-sectional schematic diagram of a battery cell provided in some other embodiments of the present application; Figure 13 is a structural schematic diagram of the insulating bracket shown in Figure 12; Figure 14 is a structural schematic diagram of the electrode assembly of a battery cell provided in some embodiments of the present application.

[0297] As shown in Figures 12 to 14 , in some embodiments, the electrode assembly 10 further includes a second electrode tab 13 having a polarity opposite to that of the first electrode tab 12 . The first and second electrode tabs 12 , 13 extend from an end of the main body 11 along the first direction X and are spaced apart along a third direction Y, which is perpendicular to the first direction X. A third accommodating recess 40 c is defined on a side of the insulating bracket 40 facing the main body 11 . The third accommodating recess 40 c is spaced apart from the first accommodating recess 40 a along the third direction Y. At least a portion of the second electrode tab 13 extends into the third accommodating recess 40 c.

[0298] The insulating bracket 40 is provided with a first accommodating recess 40 a for accommodating the first electrode tab 12 and a third accommodating recess 40 c for accommodating the second electrode tab 13 , so as to reduce the risk of short circuit, simplify the structure of the battery cell, and increase the energy density of the battery cell.

[0299] In some embodiments, the insulating support 40 further includes a partition 45 , which separates the first receiving recess 40 a from the third receiving recess 40 c .

[0300] Exemplarily, both ends of the partition plate 45 along the second direction Z are connected to the first limiting plate 42 and the second limiting plate 43 respectively, and one end of the partition plate 45 along the first direction X is connected to the insulating substrate 41 .

[0301] In some embodiments, the thickness of the partition plate 45 is greater than the thickness of the second limiting plate 43 .

[0302] The separator 45 has a greater thickness to increase the creepage distance between the first electrode tab 12 and the second electrode tab 13 .

[0303] In some embodiments, a dimension of the partition plate 45 along the first direction X is greater than a dimension of the second limiting plate 43 along the first direction X, and is less than or equal to a dimension of the first limiting plate 42 along the first direction X.

[0304] According to some embodiments of the present application, the present application further provides a battery cell comprising a shell, an electrode assembly, an electrode lead-out member, and an insulating bracket. The shell comprises a first shell wall. The electrode assembly is housed in the shell and comprises a main body and a first pole tab, the first pole tab extending from an end portion of the main body along a first direction. The electrode lead-out member is disposed in the shell and electrically connected to the first pole tab. The insulating bracket is housed in the shell and disposed along the first direction with the main body, the insulating bracket being located on one side of the first shell wall along a second direction, the first direction being perpendicular to the second direction. A first accommodating recess is provided on a side of the insulating bracket facing the main body, and at least a portion of the first pole tab extends into the first accommodating recess.

[0305] The insulating bracket includes an insulating base, a first limiting plate, a second limiting plate, and a third limiting plate. The insulating base is spaced apart from the main body along a first direction. The first limiting plate and the second limiting plate are located on a side of the insulating base facing the main body and are spaced apart along a second direction. The third limiting plate is located on a side of the second limiting plate facing the first shell wall and is connected to the insulating base. The first limiting plate is located on a side of the second limiting plate away from the first shell wall. The first accommodating recess is located between the first limiting plate and the second limiting plate. In the first direction, an end of the first limiting plate facing the main body extends beyond an end of the second limiting plate facing the main body and insulates the first electrode tab from the shell. In the second direction, at least a portion of the third limiting plate is located between the first shell wall and the electrode lead-out member.

[0306] According to some embodiments of the present application, the present application also provides a battery comprising a plurality of battery cells according to any of the above embodiments.

[0307] According to some embodiments of the present application, the present application further provides an electrical device comprising a battery cell according to any of the above embodiments, the battery cell being used to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems using the battery cell.

[0308] 4 to 8 , an embodiment of the present application provides a battery cell 6 , which includes an electrode assembly 10 , a housing 20 , an electrode lead-out member 30 , and an insulating bracket 40 .

[0309] The electrode assembly 10 is housed in a housing 20 and includes a main body 11 , a first electrode tab 12 , and a second electrode tab 13 . The first electrode tab 12 and the second electrode tab 13 extend from ends of the main body 11 along a first direction X. The first electrode tab 12 and the second electrode tab 13 have opposite polarities.

[0310] The housing 20 includes a shell 20a and a cover 20b. The shell 20a has an opening, and the cover 20b is used to cover the opening. The cover 20b and the shell 20a are arranged along a second direction Z. The second direction Z is perpendicular to the first direction X.

[0311] The housing 20a has a first recess 23 and a second recess 24 at both ends along the first direction X. The first recess 23 is recessed relative to the surface of the housing 20a away from the cover 20b, and the second recess 24 is recessed relative to the surface of the housing 20a away from the cover 20b.

[0312] The electrode lead-out member 30 is fixed to the cap plate 20 b and includes a first connecting plate 31 , a second connecting plate 32 , a third connecting plate 33 , an electrode terminal 34 , and a terminal plate 35 .

[0313] The first connecting plate 31 and the third connecting plate 33 are spaced apart along the second direction Z. The first connecting plate 31 is located on a side of the third connecting plate 33 facing away from the cover plate 20 b. The first connecting plate 31 and the third connecting plate 33 are located on the same side of the main body 11 along the first direction X. The second connecting plate 32 is connected to an end of the first connecting plate 31 closer to the main body 11 and an end of the third connecting plate 33 closer to the main body 11.

[0314] The electrode terminal 34 protrudes from the surface of the third connection plate 33 facing the cover plate 20b and passes through the cover plate 20b to extend to the outside of the cover plate 20b. The terminal plate 35 is located on the side of the cover plate 20b facing away from the housing 20a.

[0315] The first connecting plate 31 , the second connecting plate 32 , the third connecting plate 33 and the electrode terminal 34 are integrally formed. The portion of the electrode terminal 34 extending out of the cover plate 20 b is riveted to the terminal plate 35 , so that the terminal plate 35 and the electrode terminal 34 are fixed to the cover plate 20 b .

[0316] In the second direction Z, the projection of the terminal board 35 is located within the projection of the first recess 23 .

[0317] The first electrode tab 12 includes a first portion 121, a bent portion 122, and a second portion 123. The first portion 121 is located on a side of the first connecting plate 31 facing away from the third connecting plate 33 and is welded to the first connecting plate 31. The bent portion 122 extends from an end of the first portion 121 away from the main body 11 and bends along the end of the first connecting plate 31 away from the main body 11. The second portion 123 extends from an end of the bent portion 122 away from the first portion 121 toward the main body 11. In the second direction Z, at least a portion of the second portion 123 is located between the first connecting plate 31 and the third connecting plate 33.

[0318] The insulating bracket 40 includes an insulating substrate 41, a first limiting plate 42, a second limiting plate 43 and a third limiting plate 44. The insulating substrate 41 and the main body 11 are spaced apart along the first direction X. The first limiting plate 42, the second limiting plate 43 and the third limiting plate 44 are located on the side of the insulating substrate 41 facing the main body 11, and are spaced apart in sequence along the second direction Z.

[0319] The insulating substrate 41 , the first limiting plate 42 and the second limiting plate 43 define a first accommodating recess 40 a . An end of the first connecting plate 31 away from the main body 11 extends into the first accommodating recess 40 a so that the bent portion 122 is accommodated in the first accommodating recess 40 a .

[0320] The insulating substrate 41 , the third limiting plate 44 and the second limiting plate 43 define a second accommodating recess 40 b , and one end of the third connecting plate 33 away from the main body 11 extends into the second accommodating recess 40 b .

[0321] The first limiting plate 42, the second limiting plate 43, and the third limiting plate 44 are arranged along one side of the cover plate 20b. At least a portion of the third limiting plate 44 is clamped between the cover plate 20b and the third connecting plate 33 in the second direction Z to secure the insulating bracket 40 to the cover plate 20b. The second limiting plate 43 is thicker than the first limiting plate 42.

[0322] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described 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 within the scope of the claims.

Claims

1. A battery cell, comprising: shell; an electrode assembly, contained in the housing and comprising a main body and a first electrode tab, wherein the first electrode tab extends from an end of the main body along a first direction; An electrode lead-out member, disposed on the housing and electrically connected to the first electrode tab; An insulating bracket is accommodated in the shell and arranged along the first direction with the main body, a portion of the insulating bracket is located between the electrode lead-out piece and the shell, and a first accommodating recess is provided on the side of the insulating bracket facing the main body, and at least a portion of the first electrode ear extends into the first accommodating recess.

2. The battery cell according to claim 1, wherein: The first electrode tab is bent in the first accommodating recess.

3. The battery cell according to claim 1 or 2, wherein: The first electrode tab comprises: A first part connected to the main body and the electrode lead-out member; a bent portion extending from one end of the first portion away from the main body portion and bent relative to the first portion, the bent portion being accommodated in the first accommodating recess; and The second portion extends from an end of the bent portion away from the first portion toward the main body portion.

4. The battery cell according to any one of claims 1 to 3, wherein: The insulating support comprises an insulating substrate, a first limiting plate and a second limiting plate, and the insulating substrate and the main body are spaced apart along the first direction; The first limiting plate and the second limiting plate are located on a side of the insulating substrate facing the main body and are spaced apart along a second direction, wherein the first direction is perpendicular to the second direction; The first accommodating recess is located between the first limiting plate and the second limiting plate.

5. The battery cell according to claim 4, wherein: The thickness of the second limiting plate is greater than the thickness of the first limiting plate.

6. The battery cell according to claim 4 or 5, wherein: The second limiting plate supports the first electrode tab.

7. The battery cell according to any one of claims 4 to 6, wherein: In the first direction, one end of the first limiting plate facing the main body exceeds one end of the second limiting plate facing the main body, and insulates the first electrode tab from the housing.

8. The battery cell according to claim 7, wherein: The first limiting plate protrudes from the insulating substrate in the first direction by a dimension D1, and the second limiting plate protrudes from the insulating substrate in the first direction by a dimension D2; D1 and D2 satisfy: 0.3≤D2 / D1≤0.

7.

9. The battery cell according to any one of claims 4 to 8, wherein: The electrode lead-out member comprises a first connecting plate connected to the first electrode tab, the first connecting plate being located between the main body and the insulating substrate in the first direction, and an end of the first connecting plate away from the main body being located between the first limiting plate and the second limiting plate in the second direction; The first electrode tab is bent in the first accommodating recess along the end of the first connecting plate away from the main body. fold.

10. The battery cell according to claim 9, wherein: The electrode lead-out member further includes a second connecting plate connected to an end of the first connecting plate close to the main body; the second connecting plate separates the end of the first electrode tab from the main body in the first direction.

11. The battery cell according to claim 10, wherein: The housing comprises a first shell wall, the electrode assembly and the insulating bracket are located on the same side of the first shell wall along the second direction, and the first limiting plate is located on a side of the second limiting plate away from the first shell wall; The electrode lead-out member further includes a third connecting plate and an electrode terminal, the third connecting plate is located on a side of the first connecting plate facing the first shell wall, the second connecting plate connects the first connecting plate and the third connecting plate, and the electrode terminal connects the third connecting plate and passes through the first shell wall.

12. The battery cell according to claim 11, wherein: The first connecting plate, the second connecting plate, the third connecting plate and the electrode terminal are an integrally formed structure.

13. The battery cell according to any one of claims 4 to 12, wherein: The housing comprises a first housing wall, and the insulating bracket is located on one side of the first housing wall along the second direction; The insulating bracket further includes a third limiting plate, the third limiting plate is located on a side of the second limiting plate facing the first shell wall and connected to the insulating substrate, and the first limiting plate is located on a side of the second limiting plate away from the first shell wall; In the second direction, at least a portion of the third limiting plate is located between the first shell wall and the electrode lead-out member.

14. The battery cell according to claim 13, wherein: In the first direction, one end of the second limiting plate facing the main body exceeds one end of the third limiting plate facing the main body. 15 . The battery cell according to claim 1 , further comprising an insulating member, at least a portion of which is located between the outer shell and the electrode lead-out member.

16. The battery cell according to claim 15, wherein: The insulating support is connected to the insulating member.

17. The battery cell according to claim 15 or 16, wherein: An insulating recess is formed at one end of the insulating member away from the main body along the first direction, and at least a portion of the insulating bracket is inserted into the insulating recess.

18. The battery cell according to claim 17, wherein: The portion of the insulating bracket inserted into the insulating recess is interference-engaged between the housing and the insulating member in a second direction, and the second direction is perpendicular to the first direction.

19. The battery cell according to any one of claims 1 to 18, wherein: In the first direction, the insulating support abuts against the main body.

20. The battery cell according to any one of claims 1 to 19, wherein: The shell is provided with a liquid injection hole; The insulating support is provided with a liquid injection channel, and the liquid injection channel is connected to the space between the main body and the insulating support; The peripheral wall of the injection channel includes a drainage wall. In the axial direction of the injection hole, the injection hole is opposite to the drainage wall, and the injection channel is located on a side of the drainage wall facing the injection hole.

21. The battery cell according to claim 20, wherein: The liquid injection channel forms a liquid injection opening on a surface of the insulating bracket facing the main body.

22. The battery cell according to claim 20 or 21, wherein: A second accommodating recess is provided on a side of the insulating bracket facing the main body, and the second accommodating recess and the first accommodating recess are arranged along a second direction; The injection channel is located at one side of the second accommodating recess along the third direction and is connected to the second accommodating recess. The first direction, the second direction and the third direction are perpendicular to each other.

23. The battery cell according to any one of claims 1 to 22, wherein: A plurality of accommodating recesses are provided on one side of the insulating bracket facing the main body, and the plurality of accommodating recesses are arranged along a second direction, and the second direction is perpendicular to the first direction; One of the plurality of accommodating recesses is the first accommodating recess; The sum of the dimensions of the plurality of accommodating recesses along the second direction is D3, and the dimension of the insulating bracket along the second direction is D4; D3 and D4 satisfy: 0.3≤D3 / D4≤0.

7.

24. The battery cell according to any one of claims 1 to 23, wherein: The electrode assembly further includes a second electrode tab, the polarity of the second electrode tab is opposite to that of the first electrode tab, the first electrode tab and the second electrode tab extend from an end of the main body along the first direction and are spaced apart along a third direction, the third direction being perpendicular to the first direction; A third accommodating recess is provided on a side of the insulating bracket facing the main body, and the third accommodating recess and the first accommodating recess are arranged at intervals along the third direction; At least a portion of the second electrode tab extends into the third accommodating recess.

25. The battery cell according to any one of claims 1 to 24, wherein: The housing comprises a first shell wall and a second shell wall which are arranged opposite to each other along a second direction, the main body is located between the first shell wall and the second shell wall, and the second direction is perpendicular to the first direction; The housing is provided with a first recessed portion, the first recessed portion being recessed relative to the outer surface of the second shell wall toward the first shell wall; The electrode lead-out member comprises a terminal plate located on a side of the first shell wall away from the second shell wall; In the second direction, the projection of the terminal board is located within the projection of the first recess.

26. The battery cell according to claim 25, wherein: In the second direction, a projection of the insulating support at least partially overlaps with a projection of the first recess.

27. The battery cell according to claim 25 or 26, wherein: The housing comprises a shell and a cover plate which are arranged opposite to each other along a second direction, the shell has an opening, and the cover plate covers the opening; The cover plate includes the first shell wall, and the housing includes the second shell wall.

28. The battery cell according to any one of claims 1 to 27, wherein: The size of the shell along the first direction is L1, the size of the shell along the second direction is L2, and the size of the shell along the third direction is L3, and the first direction, the second direction and the third direction are perpendicular to each other; 3≤L1 / L3≤7, 2≤L3 / L2≤7.

29. A battery comprising a plurality of battery cells according to any one of claims 1 to 28.

30. An electrical device comprising the battery according to claim 29, wherein the battery is used to provide electrical energy.

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