Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery cell comprises a shell, an electrode assembly and an insulating assembly. The shell comprises a first wall part, the inner surface of the first wall part comprises a first part, a second part and a bent part, and the bent part is connected with the first part and the second part. The electrode assembly includes an electrode body and a tab, the electrode body and the first wall portion being arranged in a first direction. In the first direction, the first portion is closer to the electrode body than the second portion. The insulation assembly comprises a first insulation part and a second insulation part, the first insulation part and the second insulation part are arranged in a split mode, the first insulation part is connected to the first part, the second insulation part is connected to the second part, in the thickness direction of the bending part, the first insulation part and the bending part are at least partially overlapped, and the second insulation part and the bending part are at least partially overlapped. According to the battery monomer provided by the invention, the operation stability and the assembly efficiency of the battery monomer are improved.

Description

Battery cells, battery devices and electrical equipment Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, and power tools.

[0003] The development of battery technology must take into account multiple design factors. Improving the stability of individual battery cells and assembly efficiency is also one of the research issues in this field. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device to improve the stability of battery cell operation and assembly efficiency.

[0005] In a first aspect, this application provides a battery cell, including a casing, an electrode assembly, and an insulating assembly. The casing includes a first wall portion, and the inner surface of the first wall portion includes a first part, a second part, and a bent portion, the bent portion connecting the first part and the second part. The electrode assembly is housed within the casing, and the electrode assembly includes an electrode body and a tab. The electrode body and the first wall portion are arranged along a first direction, and the tab extends from an end of the electrode body toward the first wall portion. In the first direction, the first part is closer to the electrode body than the second part. The insulating assembly includes a first insulating member and a second insulating member, the first insulating member and the second insulating member being separately disposed. The first insulating member is connected to the first part, and the second insulating member is connected to the second part. In the thickness direction of the bent portion, the first insulating member at least partially overlaps with the bent portion, and the second insulating member at least partially overlaps with the bent portion.

[0006] In the technical solution of this application embodiment, a housing is provided to offer a stable reaction environment for the electrode assembly, reducing damage to the electrode assembly from external impurities and moisture. The electrode body of the electrode assembly is the main reaction component for the conversion of chemical and electrical energy in the battery cell, enabling the charging and discharging of the battery cell. Tabs are used to connect to the housing and transmit electrical energy. The first wall includes a first part, a second part, and a bent portion. The first part is closer to the electrode body and forms a concave structure relative to the second part, while the second part forms a relatively convex structure. The second part corresponds to at least part of the tabs, increasing the space available for the tabs. The ends of the first and second extensions in the insulation assembly are both located within the bent portion, fully utilizing the space of the bent portion. Simultaneously, during the installation of the insulation assembly, the first and second extensions can move relative to each other to absorb structural errors and stress caused by bending during installation, reducing the compression of the first wall by the insulation assembly, improving the connection strength between the electrode assembly and the housing, thereby improving the stability of the battery cell operation and assembly efficiency.

[0007] In some embodiments, the first insulating member includes a first insulating body and a first extension, and the second insulating member includes a second insulating body and a second extension. The first insulating body is disposed on the side of the first portion facing the electrode body and connected to the first portion, and the second insulating body is disposed on the side of the second portion facing the electrode body and connected to the second portion. The first extension extends from the end of the first insulating body near the second insulating body toward the second insulating body, and the second extension extends from the end of the second insulating body near the first insulating body toward the first insulating body. In the thickness direction of the bend, the first extension and the bend at least partially overlap, and the second extension and the bend at least partially overlap. In the above structure, the first insulating body is connected to the first portion, the first extension is disposed at the bend and can move relative to the outer shell, the second insulating body is connected to the second portion, and the second extension is disposed at the bend and can move relative to the outer shell. During the installation of the outer shell, the first extension and the second extension can move within a certain range, reducing the stress on the outer shell caused by the deformation and compression of the insulating component, improving the installation efficiency of the insulating component, and improving the overall structural stability of the outer shell.

[0008] In some embodiments, in the same plane perpendicular to the first direction, the orthographic projection of the second portion at least partially overlaps with the orthographic projection of the tab. In the above structure, placing the tab within the space between the second portion and the electrode assembly increases the space available for the tab, improving the connection strength and stability between the tab and the electrode assembly.

[0009] In some embodiments, the first extension and the second extension at least partially overlap in the thickness direction of the bend. In the above structure, by partially overlapping the first extension and the second extension, the creepage distance between the electrode assembly and the first wall portion is increased, thereby enhancing the insulation protection performance of the insulating assembly.

[0010] In some embodiments, in the first direction, a portion of the second extension is disposed on the side of the first extension facing the bend. In the above structure, the second extension is disposed above the first extension, which reduces the risk of debris from the casing welding entering the electrode assembly through the gap between the first and second insulators, and improves the stability of the battery cell operation.

[0011] In some embodiments, the first extension includes a first base and a first thinned portion, the thickness of the first thinned portion being less than the thickness of the first base. The first base and the second extension are spaced apart, and the first thinned portion is connected to one end of the first base near the second extension. In the thickness direction of the bending portion, the first thinned portion and the second extension at least partially overlap. In the above structure, by providing the first thinned portion, the thickness of the first extension is reduced, the space occupied by the first extension in the bending portion is reduced, further reducing the stress of the insulating components on the electrode components and the casing during assembly, improving the stability of the battery cell operation, and increasing the energy density of the battery cell.

[0012] In some embodiments, the second extension includes a second base and a second thinned portion, the thickness of the second thinned portion being less than the thickness of the second base. The second base is spaced apart from the first extension, and the second thinned portion is connected to one end of the second base near the first extension. In the thickness direction of the bending portion, the second thinned portion at least partially overlaps with the first extension. In the above structure, by providing the second thinned portion, the thickness of the second extension is reduced, the space occupied by the second extension in the bending portion is reduced, further reducing the stress of the insulating components on the electrode components and the casing during assembly, improving the operational stability of the battery cell, and increasing the energy density of the battery cell.

[0013] In some embodiments, a gap is provided between the first extension and the second extension, and the insulating assembly further includes a third insulating member that covers the gap in a first direction. In the above structure, by providing a gap between the first extension and the second extension, the flexibility of relative movement between the first extension and the second extension is improved, and by providing a third insulating member to cover the gap, the creepage distance between the electrode assembly and the first wall is increased, thereby improving the insulation protection performance of the insulating assembly, and thus improving the operational stability of the battery cell and the assembly convenience of the insulating assembly.

[0014] In some embodiments, the third insulating member is connected to at least one of the bent portion, the first extension portion, and the second extension portion. In the above-described structure, the third insulating member can be connected in various ways, resulting in high assembly efficiency and stable insulation performance.

[0015] In some embodiments, in the first direction, a portion of the third insulating member is located between the bend and the first extension, and another portion of the third insulating member is located between the bend and the second extension. Alternatively, in the first direction, a portion of the third insulating member is located on the side of the first extension away from the bend and connected to the first extension, and another portion of the third insulating member is located on the side of the second extension away from the bend and connected to the second extension. In the above structure, placing the third insulating member between the housing and the first and second insulating members increases the creepage distance between the housing and the electrode assembly, thereby improving the insulation protection performance of the insulating assembly.

[0016] In some embodiments, there are two second portions and two bends. The two bends are respectively connected to the two ends of the first portion along the second direction, which is perpendicular to the first direction. Each second portion is connected to a corresponding bend. In the above structure, having two second portions allows the two tabs of the electrode assembly to be simultaneously positioned on the side facing the first wall. Having two bends also increases the assembly space for the two tabs, improving the connection strength and stability between the electrode assembly and the housing.

[0017] In some embodiments, two second insulating members are provided, and the second insulating bodies of the two second insulating members are respectively connected to the two second portions. In the above structure, the provision of two second insulating members to insulate the two second portions from the electrode assembly improves the insulation protection performance, thereby increasing the operating efficiency of the battery cell.

[0018] In some embodiments, the battery cell further includes electrode terminals disposed on the first wall portion and electrically connected to the tabs, and the electrode terminals are located in the first portion. The above structure, by placing the electrode terminals in the first portion, makes full use of the space on the outer side of the casing, thus improving space utilization.

[0019] In some embodiments, the battery cell further includes an adapter plate, which includes a first adapter portion, a second adapter portion, and a third adapter portion. The first adapter portion is disposed on the side of the first portion facing the electrode body and connected to the electrode terminal, and the second adapter portion is disposed on the side of the second portion facing the electrode body and connected to the tab. In the above structure, by providing the adapter plate to connect the tab of the electrode assembly to the electrode terminal of the housing, the transmission of electrical energy is realized, providing a channel for the charging and discharging process of the battery cell. The first adapter portion of the adapter plate is disposed in the first portion, and the second adapter portion of the adapter plate is disposed in the second portion, making full use of the space on the housing, improving space utilization, and simultaneously increasing the spatial energy density of the battery cell.

[0020] In some embodiments, in a first direction, the first adapter portion is closer to the electrode body than the second adapter portion, and the third adapter portion connects the first adapter portion and the second adapter portion. At least a portion of the first extension portion is disposed between the third adapter portion and the bend portion, and at least a portion of the second extension portion is disposed between the second adapter portion and the bend portion. In the above structure, the movable ends of the first extension portion and the second extension portion are disposed between the bend portion and the third adapter portion. This gap space is utilized, and the compressive stress formed in the transition areas on both sides of the bend portion is released at this point, improving the connection stability and strength between the adapter piece and the end cap and the electrode assembly.

[0021] In some embodiments, a recess is formed on the side of the first wall portion facing the electrode body, the recess being recessed relative to the inner surface of the first portion, the bottom surface of the recess being formed in the second portion, and the second adapter portion being accommodated within the recess. In the above structure, by providing the recess, the space occupied by the housing is reduced, and by accommodating the second adapter portion within the recess, the connection between the adapter piece and the electrode terminal is facilitated, improving the connection strength and thus enhancing the operational stability of the battery cell.

[0022] In some embodiments, the electrode terminals do not extend beyond the outer surface of the second portion along the direction of the electrode assembly pointing towards the first wall. In the above structure, the electrode terminals are completely disposed within the recess, reducing the risk of interference with other components during battery cell installation and improving the overall stability of the battery device.

[0023] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0024] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0027] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0028] Figure 2 is an exploded schematic diagram of a battery device provided in some embodiments of this application;

[0029] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0030] Figure 4 is an enlarged structural diagram of part A in Figure 3;

[0031] Figure 5 is a partial structural schematic diagram of the first insulating member and the second insulating member provided in some embodiments of this application;

[0032] Figure 6 is a partial structural schematic diagram of the first insulating member and the second insulating member provided in some embodiments of this application;

[0033] Figure 7 is a partial structural schematic diagram of the first insulating member and the second insulating member provided in some embodiments of this application;

[0034] Figure 8 is a partial structural schematic diagram of the first insulating member and the second insulating member provided in some embodiments of this application;

[0035] Figure 9 is a partial structural schematic diagram of the first insulating member and the second insulating member provided in some embodiments of this application;

[0036] Figure 10 is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0037] Figure 11 is a schematic diagram of the structure of the adapter plate provided in some embodiments of this application;

[0038] Figure 12 is an enlarged structural diagram of part B in Figure 11.

[0039] Detailed Explanation of Reference Numerals

[0040] 1. Vehicle; 2. Battery assembly; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 6. Battery cell; 10. Electrode assembly; 101. Electrode body; 102. Tab; 20. Housing; 201. First wall section; 202. First part; 203. Second part; 204. Bending part; 205. Recess; 50. Electrode terminal; 60. Insulation assembly; 601. First Insulating component; 602, second insulating component; 603, first insulating body; 604, first extension; 605, second insulating body; 606, second extension; 607, first base; 608, first thinned portion; 609, second base; 610, second thinned portion; 611, third insulating component; 70, adapter piece; 701, first adapter; 702, second adapter; 703, third adapter; X, first direction; Y, second direction. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0052] In this application, "multiple" means two or more (including two).

[0053] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0054] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0055] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0056] 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 disposed on at least one surface of the positive electrode current collector.

[0057] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0058] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0059] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0060] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0061] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] 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.

[0063] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0064] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0065] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0066] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0067] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0068] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0069] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0070] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without 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 single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0071] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0072] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0073] Liquid electrolytes include electrolyte salts and solvents.

[0074] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0075] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0076] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0077] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid—lithium salt.

[0078] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0079] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0080] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0081] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0082] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0083] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0084] In some implementations, the electrode assembly is a stacked structure.

[0085] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0086] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0087] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0088] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0089] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0090] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0091] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0092] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0093] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0094] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0095] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0096] In a single battery cell, the insulating component is located inside the outer casing to insulate the casing from the electrode assembly. To improve the space utilization of the battery cell, a bend can be provided on the first wall of the casing. A bending angle is formed near the bend, and stress is generated on the insulating sheet at the mounting angle, causing compression between the electrode assembly and the casing. This reduces the connection stability between the electrode assembly and the casing, increases the risk of separation between the electrode assembly and the casing, and thus reduces the operational stability of the battery cell.

[0097] In view of this, this application provides a battery cell that provides a stable reaction environment for the electrode assembly by setting a shell, reducing the damage to the electrode assembly caused by external impurities and moisture. The electrode body of the motor assembly is the main reaction component for the conversion of chemical energy and electrical energy in the battery cell, enabling the charging and discharging of the battery cell. The tabs are used to connect with the shell and transmit electrical energy. The first wall includes a first part, a second part, and a bent part. The first part is closer to the electrode body and forms a concave structure relative to the second part, while the second part forms a relatively convex structure. The second part is provided with at least some of the tabs, increasing the space for the tabs. The ends of the first extension and the second extension in the insulation assembly are both located within the bent part. Therefore, during the installation of the insulation assembly, the first extension and the second extension can move relative to each other to absorb structural errors and stress caused by bending during installation, reducing the compression of the first wall by the insulation assembly, improving the connection strength between the electrode assembly and the shell, thereby improving the stability of the battery cell operation and the assembly efficiency.

[0098] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0099] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0100] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0102] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0103] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0104] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0105] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0106] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0107] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0108] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0109] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0110] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0111] As shown in Figure 1, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0112] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0113] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0114] Figure 2 is an exploded view of a battery provided in some embodiments of this application. As shown in Figure 2, the battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The battery cell 6 can be the smallest unit that makes up the battery.

[0115] The housing 5 is used to house the battery cell 6, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 6. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0116] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0117] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0118] In the battery device 2, there can be one or more battery cells 6. If there are multiple battery cells 6, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0119] Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the whole composed of multiple battery cells 6 can be housed in the housing 5; of course, multiple battery cells 6 can also be connected in series, parallel, or in a mixed manner to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a mixed manner to form a whole, and housed in the housing 5.

[0120] Please refer to Figures 3 and 4. Figure 3 is a structural schematic diagram of the battery cell 6 provided in some embodiments of this application, and Figure 4 is an enlarged structural schematic diagram of part A in Figure 3.

[0121] As shown in the figure, the battery cell 6 provided in this embodiment includes a housing 20, an electrode assembly 10, and an insulating assembly 60. The housing 20 includes a first wall portion 201, and the inner surface of the first wall portion 201 includes a first part 202, a second part 203, and a bent part 204, the bent part 204 connecting the first part 202 and the second part 203. The electrode assembly 10 is housed within the housing 20, and the electrode assembly 10 includes an electrode body 101 and a tab 102. The electrode body 101 and the first wall portion 201 are arranged along a first direction X, and the tab 102 extends from the end of the electrode body 101 toward the first wall portion 201.

[0122] In the first direction X, the first portion 202 is closer to the electrode body 101 than the second portion 203. The insulating assembly 60 includes a first insulating member 601 and a second insulating member 602, which are separately disposed. The first insulating member 601 is connected to the first portion 202, and the second insulating member 602 is connected to the second portion 203. In the thickness direction of the bend 204, the first insulating member 601 at least partially overlaps with the bend 204, and the second insulating member 602 at least partially overlaps with the bend 204.

[0123] For example, the first direction X is the height direction of the battery cell 6.

[0124] For example, the housing 20 includes an end cap and a housing, the housing having an opening, the end cap closing onto the opening and together with the housing forming a receiving cavity, and the first wall portion 201 being the end cap.

[0125] The insulating component 60 is typically fitted snugly to the end cap to improve the tightness of the assembly and the accuracy of the installation position. The insulating component 60 is typically made of materials such as polypropylene, polyethylene, polytetrafluoroethylene, rubber, and silicone. These materials possess high insulation properties and a certain degree of mechanical strength, as well as some elasticity, allowing them to adapt to changes in the shape of the housing 20.

[0126] In the technical solution of this application embodiment, the outer shell 20 provides a stable reaction environment for the electrode assembly 10, reducing the damage to the electrode assembly 10 caused by external impurities and moisture. The electrode body 101 of the motor assembly is the main reaction component for the conversion of chemical energy and electrical energy in the battery cell 6, enabling the charging and discharging of the battery cell 6. The tab 102 is used to connect with the outer shell 20 to transmit electrical energy. The first wall portion 201 includes a first part 202, a second part 203, and a bent part 204. The first part 202 is closer to the electrode body 101 and forms a concave structure relative to the second part 203. The second part 203 forms a relatively convex structure. The second part 203 is provided corresponding to at least part of the tab 102, increasing the space for the tab 102. The ends of the first extension 604 and the second extension 606 in the insulating assembly 60 are both disposed within the bending portion 204. Therefore, during the installation of the insulating assembly 60, the first extension 604 and the second extension 606 can move relative to each other to absorb structural errors and stress caused by bending during installation. This reduces the compression of the first wall portion 201 by the insulating assembly 60, improves the connection strength between the electrode assembly 10 and the outer casing 20, and thus improves the stability of the battery cell 6 and the assembly efficiency.

[0127] In some embodiments of this application, the first insulating member 601 includes a first insulating body 603 and a first extension 604, and the second insulating member 602 includes a second insulating body 605 and a second extension 606. The first insulating body 603 is disposed on the side of the first portion 202 facing the electrode body 101 and connected to the first portion 202, and the second insulating body 605 is disposed on the side of the second portion 203 facing the electrode body 101 and connected to the second portion 203. The first extension 604 extends from the end of the first insulating body 603 near the second insulating body 605 toward the second insulating body 605, and the second extension 606 extends from the end of the second insulating body 605 near the first insulating body 603 toward the first insulating body 603. In the thickness direction of the bending portion 204, the first extension 604 and the bending portion 204 at least partially overlap, and the second extension 606 and the bending portion 204 at least partially overlap.

[0128] In the above structure, the first insulating body 603 is connected to the first part 202, the first extension 604 is disposed at the bending part 204 and can move relative to the outer shell, the second insulating body 605 is connected to the second part 203, and the second extension 606 is disposed at the bending part 204 and can move relative to the outer shell. During the installation of the outer shell 20, the first extension 604 and the second extension 606 can move within a certain range, reducing the stress caused to the outer shell 20 by the deformation and compression of the insulating component 60, improving the installation efficiency of the insulating component 60, and improving the overall structural stability of the outer shell 20.

[0129] In some embodiments of this application, the orthographic projection of the second portion 203 at least partially overlaps with the orthographic projection of the tab 102 in the same plane perpendicular to the first direction X.

[0130] Compared to the first part, the second part 203 is further away from the electrode assembly 10, meaning that there is a certain spatial gap between the second part 203 and the electrode assembly 10. In the above structure, the tab 102 is placed in the space between the second part 203 and the electrode assembly 10, which increases the space for the tab 102 and improves the connection strength and stability between the tab 102 and the electrode assembly 10, thereby improving the operational stability of the battery cell 6.

[0131] In some embodiments of this application, the first extension 604 and the second extension 606 at least partially overlap in the thickness direction of the bend 204.

[0132] In the thickness direction of the bent portion 204, the first extension 604 and the second extension 606 form a partially overlapping structure. This design, through a spatially staggered arrangement, increases the effective isolation path between the electrode assembly 10 and the first wall portion 201 within a limited volume. By increasing the isolation path, the electrical isolation performance between the electrode assembly 10 and the first wall portion 201 can be improved, reducing the risk of short circuits or breakdowns and enhancing insulation protection performance. Simultaneously, a longer isolation path may also aid in heat dissipation, improving the thermal stability of the structure.

[0133] As shown in FIG5, in some embodiments of this application, in the first direction X, a portion of the second extension 606 is disposed on the side of the first extension 604 facing the bend 204.

[0134] A portion of the second extension 606 is disposed on the side of the first extension 604 facing the bend 204, and at least partially overlaps the second extension 606 and the first extension 604 along the first direction X. Simultaneously, the second extension 606 is disposed above the first extension 604, and the two are positioned relative to each other in the vertical direction.

[0135] The aforementioned structure reduces the risk of welding debris from the casing 20 entering the electrode assembly 10 through the gap between the first insulator 601 and the second insulator 602. Metal debris or other impurities may be generated during the welding process of the casing 20. If these impurities enter the electrode assembly 10, they may cause short circuits, degraded battery performance, or safety hazards. By positioning the second extension 606 above the first extension 604, the entry of debris through the gap between the insulators is reduced or prevented, thereby improving the stability of the battery cell 6.

[0136] As shown in FIG6, in some embodiments of this application, the first extension 604 includes a first base 607 and a first thinning portion 608, the thickness of the first thinning portion 608 being less than the thickness of the first base 607. The first base 607 and the second extension 606 are spaced apart, and the first thinning portion 608 is connected to the end of the first base 607 near the second extension 606. In the thickness direction of the bending portion 204, the first thinning portion 608 and the second extension 606 at least partially overlap.

[0137] The first base 607 and the first thinned portion 608 are integrally molded from the same material. By providing the first thinned portion 608, the thickness of the first extension 604 is reduced, thereby reducing the space occupied by the first extension 604 at the bending portion 204. This reduces the stress on the electrode assembly 10 and the housing 20 by the insulating component 60 during assembly. Reduced stress helps reduce the risk of damage during assembly, improving assembly reliability and efficiency. Reduced stress means the battery is less susceptible to external factors during operation, thus improving its long-term operational reliability. By optimizing space utilization and reducing unnecessary material usage, more active material can be accommodated in the same volume, thereby increasing the battery's energy storage capacity.

[0138] In some embodiments of this application, the second extension 606 includes a second base 609 and a second thinned portion 610, the thickness of the second thinned portion 610 being less than the thickness of the second base 609. The second base 609 is spaced apart from the first extension 604, and the second thinned portion 610 is connected to the end of the second base 609 near the first extension 604. In the thickness direction of the bent portion 204, the second thinned portion 610 at least partially overlaps with the first extension 604.

[0139] The second base 609 and the second thinning portion 610 are integrally molded from the same material. By providing the second thinning portion 610, the thickness of the second extension 606 is reduced, thereby reducing the space occupied by the second extension 606 in the bending portion 204. This helps optimize the overall structure of the battery cell 6 and improves space utilization. It also reduces the stress on the electrode assembly 10 and the casing 20 from the insulating component 60 during assembly. The reduction in stress helps reduce the risk of damage during assembly and improves the reliability and durability of the battery. Reduced stress means that the battery is less susceptible to external factors during operation, thus maintaining its long-term operational reliability. By optimizing space utilization and reducing unnecessary material usage, more active material can be accommodated in the same volume, thereby improving the battery's energy storage and release capabilities.

[0140] As shown in Figure 7, in some alternative embodiments, the first thinning portion 608 is disposed on the side of the second thinning portion 610 near the first wall portion 201. This structure reduces the risk of welding impurities entering the electrode assembly 10 through the gap between the first insulating member 601 and the second insulating member 602, thereby improving the operational stability of the battery cell 6.

[0141] As shown in FIG8, in some embodiments of this application, a gap is provided between the first extension 604 and the second extension 606, and the insulating component 60 further includes a third insulating member 611, which covers the gap in the first direction X.

[0142] A gap is provided between the first extension 604 and the second extension 606. This design allows for a degree of flexibility during relative movement. The presence of the gap reduces stress concentration caused by factors such as thermal expansion and contraction, mechanical vibration, or assembly errors, thereby improving the durability and reliability of the structure.

[0143] The insulating assembly 60 also includes a third insulating element 611, which covers the gap in the first direction X. The main function of the third insulating element 611 is to increase the creepage distance between the electrode assembly 10 and the first wall portion 201. Creepage distance refers to the shortest path between two conductive parts measured along the insulating surface. Increasing the creepage distance can improve insulation performance, which helps reduce safety accidents caused by insulation failure and improves the operational stability of the battery cell 6. By covering the gap, the third insulating element 611 also plays a role in isolation and protection, preventing external impurities or moisture from entering the gap and affecting the performance of the battery cell 6. At the same time, the design of the third insulating element 611 also takes into account assembly convenience, making it easier to position and align the insulating assembly 60 during assembly, thus improving production efficiency.

[0144] In some embodiments of this application, the third insulating member 611 is connected to at least one of the bent portion 204, the first extension 604, and the second extension 606. Exemplarily, the third insulating member 611 is adhesively connected to the side surface of the bent portion 204 facing the first insulating member 601 and the second insulating member 602. Alternatively, one end of the third insulating member 611 is adhesively connected to the first extension 604, and the other end covers at least a portion of the second extension 606. Alternatively, one end of the third insulating member 611 is adhesively connected to the second extension 606, and the other end covers at least a portion of the first extension 604.

[0145] The third insulating member 611 is connected to at least one of the bent portion 204, the first extension 604, and the second extension 606. The third insulating member 611 can be flexibly connected to any one or more of the bent portion 204, the first extension 604, or the second extension 606, depending on design requirements. This flexibility in multiple connection methods allows the third insulating member 611 to more easily adapt to different assembly sequences and process requirements during assembly. The multiple connection methods of the third insulating member 611 improve assembly flexibility and make the assembly process smoother. Multiple connection methods also mean that the most suitable connection method can be selected according to the actual situation during assembly, thereby reducing assembly time and cost. The design of the third insulating member 611 may also consider ease of positioning and fixation, further improving assembly efficiency.

[0146] The third insulating member 611, as part of the insulating assembly 60, primarily functions to provide electrical isolation and prevent electric shock or short circuits. Through a stable connection with the bend 204, the first extension 604, or the second extension 606, the third insulating member 611 ensures long-term stability of insulation performance, which reduces the risk of accidents caused by insulation failure.

[0147] In some embodiments of this application, in the first direction X, a portion of the third insulating member 611 is located between the bend 204 and the first extension 604, and a portion of the third insulating member 611 is located between the bend 204 and the second extension 606.

[0148] As shown in FIG9, in some optional embodiments, in the first direction X, a portion of the third insulating member 611 is located on the side of the first extension 604 away from the bend 204 and connected to the first extension 604, and a portion of the third insulating member 611 is located on the side of the second extension 606 away from the bend 204 and connected to the second extension 606.

[0149] In the above structure, the third insulating member 611 is disposed between the housing 20 and the first insulating member 601 and the second insulating member 602, or the third insulating member 611 is disposed between the electrode assembly 10 and the first insulating member 601 and the second insulating member 602. This increases the creepage distance between the housing 20 and the electrode assembly 10 and improves the insulation protection performance of the insulating assembly 60.

[0150] As shown in Figure 10, in some embodiments of this application, there are two second portions 203 and two bending portions 204. The two bending portions 204 are respectively connected to the two ends of the first portion 202 along the second direction Y, where the second direction Y is perpendicular to the first direction X. Each second portion 203 is connected to the corresponding bending portion 204.

[0151] There are two second parts 203 and two bending portions 204. The two bending portions 204 are respectively connected to the two ends of the first part 202 along the second direction Y, where the second direction Y is perpendicular to the first direction X. Each second part 203 is connected to the corresponding bending portion 204. In the above structure, by setting two second parts 203, the two tabs 102 of the electrode assembly 10 can be simultaneously arranged on the side facing the first wall portion 201. The two bending portions 204 also increase the assembly space of the two tabs 102, thereby improving the connection strength and stability between the electrode assembly 10 and the outer shell 20.

[0152] The second part 203 is configured as two, allowing both tabs 102 of the electrode assembly 10 to be simultaneously positioned on one side facing the first wall portion 201. This design enables the tabs 102 of the electrode assembly 10 to be concentrated on one side, facilitating connection with the housing 20 or other components and simplifying the assembly process.

[0153] Two bending portions 204 are provided, which respectively increase the assembly space of the two tabs 102. The design of the bending portions 204 can take into account the shape, size and assembly requirements of the tabs 102, provide sufficient space to accommodate the tabs 102, and ensure that they can be firmly connected to the housing 20.

[0154] By setting two portions 203 and two bends 204 and rationally arranging them on the electrode assembly 10, the connection strength and stability between the electrode assembly 10 and the housing 20 are improved. This design allows the electrode assembly 10 to distribute stress more evenly when subjected to external forces, reducing local stress concentration. Simultaneously, the connection between the two bends 204 and the second portion 203 provides redundant paths for force transmission, enhancing structural redundancy and reliability.

[0155] In the above structure, the second part 203 is set as two, which allows the two tabs 102 of the electrode assembly 10 to be simultaneously set on the side facing the first wall 201. The bending part 204 is also set as two, which increases the assembly space of the two tabs 102 and improves the connection strength and stability between the electrode assembly 10 and the housing 20.

[0156] In some embodiments of this application, two second insulating members 602 are provided, and the second insulating bodies 605 of the two second insulating members 602 are respectively connected to the two second parts 203.

[0157] Two second insulating elements 602 are provided, with one corresponding to each second part 203. The second insulating bodies 605 of the two second insulating elements 602 are respectively connected to the two second parts 203, forming a tight insulating layer that effectively isolates the second part 203 from the other parts of the electrode assembly 10.

[0158] The main function of the second insulator 602 is to provide electrical isolation, prevent short circuits between different parts of the electrode assembly 10, and protect the operator from electric shock. By providing two second insulators 602, the two second parts 203 are insulated respectively, ensuring that each part is adequately insulated.

[0159] Good insulation performance is fundamental to the efficient operation of the battery cell 6. The provision of two secondary insulators 602 ensures electrical isolation between the electrode assembly 10 and the housing 20 or other components, reducing energy loss and heat generation. By improving insulation protection, the battery cell 6 can operate under safer conditions, thereby improving its overall efficiency and performance.

[0160] In some embodiments of this application, the battery cell 6 further includes an electrode terminal 50, which is disposed on the first wall portion 201 and electrically connected to the tab 102, and is located on the first portion 202.

[0161] The electrode terminal 50 is a key component for the electrical connection between the battery and external circuits, responsible for transferring the internal electrical energy of the battery to external devices. The electrode terminal 50 is located in the first part 202, positioned on the outer side or edge of the housing 20. This design allows the electrode terminal 50 to be directly exposed to the external environment, facilitating connection to external circuits, while also making full use of the space on the outer side of the housing 20. By placing the electrode terminal 50 in the first part 202 and fully utilizing the space on the outer side of the housing 20, the overall structure of the battery cell 6 becomes more compact. This design reduces unnecessary space waste and increases the energy density of the battery cell 6 per unit volume.

[0162] As shown in Figure 11, in some embodiments of this application, the battery cell 6 further includes an adapter piece 70, which includes a first adapter portion 701, a second adapter portion 702, and a third adapter portion 703. The first adapter portion 701 is disposed on the side of the first portion 202 facing the electrode body 101 and connected to the electrode terminal 50, and the second adapter portion 702 is disposed on the side of the second portion 203 facing the electrode body 101 and connected to the tab 102.

[0163] The main function of the adapter 70 is to connect the tabs 102 of the electrode assembly 10 to the electrode terminals 50 of the housing 20, thereby realizing the transmission of electrical energy. During the charging and discharging process of the battery cell 6, the adapter 70 provides a channel for current flow, ensuring that electrical energy can be transmitted efficiently and stably.

[0164] By placing the first adapter portion 701 of the adapter piece 70 in the first part 202 and the second adapter portion 702 in the second part 203, the space within the housing 20 is fully utilized. The compact design of the adapter piece 70 reduces wasted space within the battery cell 6, allowing the battery cell 6 to accommodate more electrode materials and electrolyte within a limited space, thereby improving space utilization. Because the design of the adapter piece 70 improves space utilization, the spatial energy density of the battery cell 6 is also increased. Increased spatial energy density means that the battery cell 6 can store more energy within the same volume or weight, which is crucial for improving battery range and performance.

[0165] Furthermore, the first adapter 701 is connected to the electrode terminal 50, and the second adapter 702 is connected to the tab 102. The above connection method replaces the scheme of stacking the tab 102, adapter 70, and electrode terminal 50 in the first direction X. The tab 102 and electrode terminal 50 are distributed along the second direction Y, which not only improves the connection strength and reduces the risk of connection instability caused by excessive stress at this point, but also makes full use of the space in the second direction Y of the housing, further improving the space utilization rate.

[0166] Therefore, the above structure connects the tabs 102 of the electrode assembly 10 to the electrode terminals 50 of the housing 20, which not only realizes the transmission of electrical energy, but also provides a channel for the charging and discharging process of the battery cell 6. At the same time, the design of the adapter piece 70 makes full use of the space on the housing 20, improving space utilization and spatial energy density, and providing a strong guarantee for the performance improvement and application expansion of the battery cell 6.

[0167] As shown in FIG12, in some embodiments of this application, in the first direction X, the first adapter 701 is closer to the electrode body 101 than the second adapter 702, and the third adapter 703 connects the first adapter 701 and the second adapter 702. At least a portion of the first extension 604 is disposed between the third adapter 703 and the bend 204, and at least a portion of the second extension 606 is disposed between the second adapter 702 and the bend 204.

[0168] The third adapter 703 connects the first adapter 701 and the second adapter 702, structurally linking them and also undertaking the task of current transmission. At least a portion of the first extension 604 is disposed between the third adapter 703 and the bend 204, indicating that the first extension 604 structurally overlaps or is adjacent to the third adapter 703 and the bend 204, thus improving insulation performance. At least a portion of the second extension 606 is disposed between the second adapter 702 and the bend 204, further improving insulation performance.

[0169] The movable ends of the first extension 604 and the second extension 606 are disposed between the bent portion 204 and the third adapter portion 703. This design effectively utilizes the gap space between the bent portion 204 and the third adapter portion 703. The provision of the movable ends may allow the adapter piece 70 to have a certain degree of flexibility or adjustment space during assembly or use, thereby adapting to structural changes or stress distribution inside the battery cell 6.

[0170] The compressive stress generated in the transition areas on both sides of the bending portion 204 is released at this location (i.e., between the bending portion 204 and the third transition portion 703). Through the provision of the movable end and the utilization of the gap space, the transition piece 70 can better withstand and disperse the compressive stress generated internally. Effective release of compressive stress helps reduce the risk of structural deformation and damage, and improves the connection stability and strength between the transition piece 70 and the end cap and electrode assembly 10.

[0171] In the above structure, the movable ends of the first extension 604 and the second extension 606 are disposed between the bending portion 204 and the third adapter portion 703. While utilizing this gap space, the compressive stress formed in the transition area on both sides of the bending portion 204 is released at this point, thereby improving the connection stability and strength between the adapter piece 70 and the end cap and the electrode assembly 10.

[0172] As shown in FIG10, in some embodiments of this application, a recess 205 is formed on the side of the first wall portion 201 facing the electrode body 101. The recess 205 is recessed relative to the inner surface of the first portion 202. The bottom surface of the recess 205 is formed in the second portion 203. The second transition portion 702 is accommodated in the recess 205.

[0173] A recess 205 is formed on the side of the first wall portion 201 facing the electrode body 101. The recess 205 is recessed relative to the inner surface of the first portion 202, indicating that the depth of the recess 205 is lower than that of the inner surface of the first portion 202, forming a recessed space. The bottom surface of the recess 205 is formed in the second portion 203, which clarifies the specific position of the recess 205 in the structure of the outer shell 20, that is, its bottom is located in the second portion 203 of the outer shell 20.

[0174] The second adapter 702 is accommodated within the recess 205 to ensure a tight fit. This fit not only saves space but also provides structural support and fixation for the second adapter 702, improving its stability. By providing the recess 205, the housing 20 retains its original function while reducing its space requirements. This design makes the battery cell 6 more compact overall, improving space utilization.

[0175] The second adapter 702 is accommodated in the recess 205, which facilitates the connection between the adapter 70 and the electrode terminal 50, improves the connection strength between the adapter 70 and the electrode terminal 50, and reduces the risk of current interruption or short circuit due to poor connection.

[0176] In the above structure, the space occupied by the outer casing 20 is reduced by setting the recess 205, and the second adapter 702 is accommodated in the recess 205, which facilitates the connection between the adapter 70 and the electrode terminal 50, improves the connection strength, and thus enhances the operational stability of the battery cell 6.

[0177] In some embodiments of this application, the electrode terminal 50 does not extend beyond the outer surface of the second portion 203 in the direction of the electrode assembly 10 pointing toward the first wall portion 201.

[0178] In the direction of the electrode assembly 10 toward the first wall portion 201, the electrode terminal 50 does not extend beyond the outer surface of the second portion 203. This means that in this specific direction of the battery cell 6, the position of the electrode terminal 50 is confined within the second portion 203 of the housing 20 and does not protrude to the outside of the housing 20.

[0179] The electrode terminal 50 is completely housed within the recess 205. This indicates that the recess 205 not only provides a receiving space 5c for the second adapter 702 but also simultaneously accommodates the electrode terminal 50. This design structurally protects and supports the electrode terminal 50 from external impacts or interference. Furthermore, since the electrode terminal 50 is completely housed within the recess 205, it will not interfere with other components during battery cell 6 installation. This design reduces the risk of assembly difficulties or damage to other components caused by protruding electrode terminals 50, improving the convenience and reliability of battery cell 6 installation.

[0180] The electrode terminals 50 are completely set inside the recess 205, making the battery cell 6 more compact and stable in structure. This reduces the risk of a decrease in the overall stability of the battery device 2 due to improper positioning of the electrode terminals 50, and improves the reliability and durability of the battery device 2 during long-term use.

[0181] In the above structure, the electrode terminal 50 is completely disposed within the recess 205, which reduces the risk of interference with other components when the battery cell 6 is installed, and improves the overall stability of the battery device 2.

[0182] In some alternative embodiments, the battery cell 6 includes a housing 20, an electrode assembly 10, electrode terminals 50, and an insulating assembly 60. The housing 20 includes a first wall 201, which includes a first portion 202, a second portion 203, and a bend 204 connecting the first portion 202 and the second portion 203. The electrode assembly 10 is housed within the housing 20 and includes an electrode body 101 and a tab 102. The electrode body 101 and the first wall 201 are arranged along a first direction X, and the tab 102 extends from the end of the electrode body 101 toward the first wall 201. In the first direction X, the first portion 202 is closer to the electrode body 101 than the second portion 203. In the same plane perpendicular to the first direction X, the orthographic projection of the second portion 203 at least partially overlaps with the orthographic projection of the tab 102. Electrode terminals 50 are disposed on the first wall portion 201 and electrically connected to the tab 102. The insulating assembly 60 includes a first insulating member 601 and a second insulating member 602, which are separately disposed. The first insulating member 601 includes a first insulating body 603 and a first extension 604, and the second insulating member 602 includes a second insulating body 605 and a second extension 606. The first insulating body 603 is disposed on the side of the first portion 202 facing the electrode body 101 and connected to the first portion 202, and the second insulating body 605 is disposed on the side of the second portion 203 facing the electrode body 101 and connected to the second portion 203. The first extension 604 extends from the end of the first insulating body 603 near the second insulating body 605 toward the second insulating body 605, and the second extension 606 extends from the end of the second insulating body 605 near the first insulating body 603 toward the first insulating body 603. In the thickness direction of the bend 204, the first extension 604 and the second extension 606 at least partially overlap with the bend 204. The first extension 604 and the second extension 606 at least partially overlap. In the first direction X, a portion of the second extension 606 is disposed on the side of the first extension 604 facing the bend 204. The first extension 604 includes a first base 607 and a first thinning portion 608, the thickness of which is less than the thickness of the first base 607. The first base 607 and the second extension 606 are spaced apart, and the first thinning portion 608 is connected to the end of the first base 607 near the second extension 606. In the thickness direction of the bend 204, the first thinning portion 608 and the second extension 606 at least partially overlap. The second extension 606 includes a second base 609 and a second thinning portion 610, the thickness of the second thinning portion 610 being less than the thickness of the second base 609. The second base 609 is spaced apart from the first extension 604, and the second thinning portion 610 is connected to the end of the second base 609 near the first extension 604.In the thickness direction of the bending portion 204, the second thinning portion 610 at least partially overlaps with the first extension portion 604. The battery cell 6 also includes an adapter piece 70, which includes a first adapter portion 701, a second adapter portion 702, and a third adapter portion 703. The first adapter portion 701 is disposed on the side of the first portion 202 facing the electrode body 101 and connected to the electrode terminal 50. The second adapter portion 702 is disposed on the side of the second portion 203 facing the electrode body 101 and connected to the tab 102. In the first direction X, the first adapter portion 701 is closer to the electrode body 101 than the second adapter portion 702, and the third adapter portion 703 connects the first adapter portion 701 and the second adapter portion 702. At least a portion of the first extension portion 604 is disposed between the third adapter portion 703 and the bending portion 204, and at least a portion of the second extension portion 606 is disposed between the second adapter portion 702 and the bending portion 204. A recess 205 is formed on the side of the first wall portion 201 facing the electrode body 101. The recess 205 is recessed relative to the inner surface of the first portion 202. The bottom surface of the recess 205 is formed in the second portion 203. The second transition portion 702 is accommodated in the recess 205.

[0183] Embodiments of this application provide a battery device 2, which includes the battery cell 6 described in the above embodiments. Embodiments of this application also provide an electrical device, which includes the battery device 2 described in the above embodiments, the battery device 2 being used to provide electrical energy.

[0184] In the battery device 2 and electrical equipment of this application, the outer casing 20 provides a stable reaction environment for the electrode assembly 10, reducing the damage to the electrode assembly 10 caused by external impurities and moisture. The electrode body 101 of the motor assembly is the main reaction component for the conversion of chemical energy and electrical energy in the battery cell 6, enabling the charging and discharging of the battery cell 6. The tabs 102 are used to connect to the outer casing 20 to transmit electrical energy. The first wall portion 201 includes a first part 202, a second part 203, and a bent portion 204. The first part 202 is closer to the electrode body 101 and forms a concave structure relative to the second part 203. The second part 203 forms a relatively convex structure. The second part 203 is provided corresponding to at least part of the tabs 102, increasing the space for the tabs 102. The ends of the first extension 604 and the second extension 606 in the insulating assembly 60 are both disposed within the bending portion 204. Therefore, during the installation of the insulating assembly 60, the first extension 604 and the second extension 606 can move relative to each other to absorb structural errors and stress caused by bending during installation. This reduces the compression of the first wall portion 201 by the insulating assembly 60, improves the connection strength between the electrode assembly 10 and the outer casing 20, and thus improves the stability of the battery cell 6 and the assembly efficiency.

[0185] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing includes a first wall portion, the inner surface of which includes a first portion, a second portion, and a bent portion, the bent portion connecting the first portion and the second portion; An electrode assembly, housed within the housing, includes an electrode body and a tab. The electrode body and the first wall portion are arranged along a first direction. The tab extends from the end of the electrode body toward the first wall portion. In the first direction, the first portion is closer to the electrode body than the second portion. An insulating assembly includes a first insulating member and a second insulating member. The first insulating member and the second insulating member are separately disposed. The first insulating member is connected to the first portion, and the second insulating member is connected to the second portion. In the thickness direction of the bent portion, the first insulating member at least partially overlaps with the bent portion, and the second insulating member at least partially overlaps with the bent portion.

2. The battery cell according to claim 1, characterized in that, The first insulating member includes a first insulating body and a first extension, and the second insulating member includes a second insulating body and a second extension. The first insulating body is disposed on the side of the first portion facing the electrode body and connected to the first portion. The second insulating body is disposed on the side of the second portion facing the electrode body and connected to the second portion. The first extension extends from the end of the first insulating body near the second insulating body toward the second insulating body, and the second extension extends from the end of the second insulating body near the first insulating body toward the first insulating body. In the thickness direction of the bend, the first extension and the bend at least partially overlap.

3. The battery cell according to claim 2, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the second portion at least partially overlaps with the orthographic projection of the tab.

4. The battery cell according to claim 2 or 3, characterized in that, In the thickness direction of the bend, the first extension and the second extension at least partially overlap.

5. The battery cell according to claim 2 or 3, characterized in that, In the first direction, a portion of the second extension is disposed on the side of the first extension facing the bend.

6. The battery cell according to claim 2 or 3, characterized in that, The first extension includes a first base and a first thinning portion, the thickness of the first thinning portion being less than the thickness of the first base; the first base and the second extension are spaced apart, and the first thinning portion is connected to one end of the first base near the second extension; in the thickness direction of the bending portion, the first thinning portion and the second extension at least partially overlap.

7. The battery cell according to claim 2 or 3, characterized in that, The second extension includes a second base and a second thinning portion, the thickness of the second thinning portion being less than the thickness of the second base; the second base is spaced apart from the first extension, and the second thinning portion is connected to one end of the second base near the first extension; in the thickness direction of the bending portion, the second thinning portion at least partially overlaps with the first extension.

8. The battery cell according to claim 2, characterized in that, A gap is provided between the first extension and the second extension, and the insulating assembly further includes a third insulating member that covers the gap in the first direction.

9. The battery cell according to claim 8, characterized in that, The third insulating element is connected to at least one of the bent portion, the first extension portion, and the second extension portion.

10. The battery cell according to claim 8 or 9, characterized in that, In the first direction, a portion of the third insulating member is located between the bend and the first extension, and a portion of the third insulating member is located between the bend and the second extension; or, in the first direction, a portion of the third insulating member is located on the side of the first extension away from the bend and connected to the first extension, and a portion of the third insulating member is located on the side of the second extension away from the bend and connected to the second extension.

11. The battery cell according to claim 2 or 3, characterized in that, There are two of each of the second part and the bending part. The two bending parts are respectively connected to the two ends of the first part along the second direction, which is perpendicular to the first direction. Each of the second parts is connected to the corresponding bending part.

12. The battery cell according to claim 11, characterized in that, The second insulating element is configured in two parts, and the second insulating body of the two second insulating elements is respectively connected to the two second parts.

13. The battery cell according to claim 2 or 3, characterized in that, The battery cell also includes an electrode terminal, which is disposed on the first wall portion and electrically connected to the tab, and the electrode terminal is disposed in the first portion.

14. The battery cell according to claim 13, characterized in that, The battery cell also includes an adapter piece, which includes a first adapter portion, a second adapter portion, and a third adapter portion. The first adapter portion is disposed on the side of the first portion facing the electrode body and connected to the electrode terminal. The second adapter portion is disposed on the side of the second portion facing the electrode body and connected to the tab.

15. The battery cell according to claim 14, characterized in that, In the first direction, the first adapter portion is closer to the electrode body than the second adapter portion, and the third adapter portion connects the first adapter portion and the second adapter portion; at least a portion of the first extension portion is disposed between the third adapter portion and the bending portion, and at least a portion of the second extension portion is disposed between the second adapter portion and the bending portion.

16. The battery cell according to claim 14, characterized in that, The first wall portion has a recess on the side facing the electrode body, the recess is recessed relative to the inner surface of the first portion, the bottom surface of the recess is formed in the second portion, and the second transition portion is accommodated in the recess.

17. The battery cell according to claim 13, characterized in that, Along the direction of the electrode assembly pointing towards the first wall portion, the electrode terminals do not extend beyond the outer surface of the second portion.

18. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-17.

19. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 18, the battery device being used to provide electrical energy.

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