Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. A wall part in the battery monomer comprises an overlapping region which is overlapped with an electrode terminal in the thickness direction of the wall part; the insulating component at least partially surrounds the electrode terminal and is fixed on the electrode terminal, and part of the insulating component is positioned between the electrode terminal and the overlapping region; in the thickness direction of the wall part, the part, located between the overlapping area and the electrode terminal, of the insulating assembly completely covers the overlapping area, and the fixing piece is fixedly connected to the wall part and the insulating assembly. As the part of the insulating component between the overlapping region and the electrode terminal completely covers the overlapping region in the thickness direction, a breakdown channel is not easy to form between the electrode terminal and the overlapping region, so that the electrode terminal is not easy to generate short circuit with the wall part, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Batteries have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation means, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, and electric tools, etc.

[0003] With the increasingly wide range of battery applications, how to improve the reliability of batteries has attracted more and more attention from those skilled in the art. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, and the battery cell has good reliability.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, an electrode terminal, an insulating assembly, and a fixing member. The housing includes a wall portion, and the wall portion is provided with an electrode lead-out hole; the electrode assembly is disposed inside the housing; at least a part of the electrode terminal is located outside the wall portion and covers the electrode lead-out hole. The wall portion includes an overlapping area that overlaps with the electrode terminal in the thickness direction of the wall portion; the insulating assembly at least partially surrounds the electrode terminal and is fixed to the electrode terminal, and a part of the insulating assembly is located between the electrode terminal and the overlapping area; in the thickness direction of the wall portion, the part of the insulating assembly located between the overlapping area and the electrode terminal completely covers the overlapping area; the fixing member is fixedly connected to the wall portion and the insulating assembly.

[0006] In the above structure, since the part of the insulating assembly located between the overlapping area and the electrode terminal completely covers the overlapping area in the thickness direction, it is not easy to form a breakdown channel between the electrode terminal and the overlapping area, so that it is not easy for the electrode terminal to be short-circuited with the wall portion, which is beneficial to improving the reliability of the battery cell.

[0007] According to the battery cell provided by some embodiments of the present application, the insulating assembly includes an insulating connecting member, the insulating connecting member at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, at least a part of the insulating connecting member is located between the electrode terminal and the overlapping area, and in the thickness direction of the wall portion, the part of the insulating connecting member located between the overlapping area and the electrode terminal completely covers the overlapping area, so that the insulating assembly can completely isolate the electrode terminal and the overlapping area through the insulating connecting member.

[0008] According to the battery cell provided by some embodiments of the present application, the insulating assembly includes an insulating seal and the insulating connecting member. The insulating connecting member at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion. The insulating connecting member surrounds the outside of the insulating seal. At least a part of the insulating seal is clamped between the electrode terminal and the overlapping region. The part of the insulating seal located between the overlapping region and the electrode terminal completely covers the overlapping region, so that the insulating assembly can completely isolate the electrode terminal and the overlapping region through the insulating seal.

[0009] According to the battery cell provided by some embodiments of the present application, the insulating assembly further includes an insulating seal and the insulating connecting member. The insulating connecting member at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion. The insulating connecting member surrounds the outside of the insulating seal. At least a part of the insulating seal is clamped between the electrode terminal and the overlapping region. At least a part of the insulating connecting member is located between the electrode terminal and the overlapping region, so that the insulating connecting member and the insulating seal together completely cover the overlapping region in the thickness direction of the wall portion to completely isolate the electrode terminal and the overlapping region.

[0010] According to the battery cell provided by some embodiments of the present application, a part of the insulating connecting member surrounds the insulating seal and abuts against the outer peripheral surface of the insulating seal, so that the insulating seal and the insulating connecting member can completely cover the overlapping region in the thickness direction of the wall portion, making it difficult to form a breakdown channel between the overlapping region and the electrode terminal and making it difficult for the electrode terminal to short-circuit with the wall portion.

[0011] According to the battery cell provided by some embodiments of the present application, in the thickness direction of the wall portion, the part of the insulating connecting member located between the electrode terminal and the overlapping region overlaps with the part of the insulating seal clamped between the electrode terminal and the overlapping region, so that there is a partial region between the overlapping region and the electrode terminal that has both the insulating seal and the insulating connecting member, enabling the insulating connecting member and the insulating seal to better completely cover the overlapping region.

[0012] According to the battery cell provided by some embodiments of the present application, a first recess is provided on the side of the insulating connecting member facing the overlapping region, and a part of the insulating seal is received in the first recess, so that in the thickness direction of the wall portion, the insulating seal entering the first recess can be arranged overlapping with the insulating connecting member, enabling the insulating assembly to better cover the overlapping region.

[0013] According to the battery cell provided by some embodiments of the present application, the electrode terminal has an end face facing the overlapping region and a second recess recessed relative to the end face. The second recess surrounds the end face and extends to the outer peripheral surface of the electrode terminal; the insulating seal completely separates the overlapping region from the end face; a part of the insulating connecting member is arranged in the second recess and completely separates the bottom surface of the second recess from the overlapping region.

[0014] In the above structure, by using a part of the insulating connector to completely separate the bottom surface of the second recess from the overlapping region, and using the insulating seal to completely separate the overlapping region from the end surface, the part of the insulating component located between the overlapping region and the electrode terminal can completely cover the overlapping region, making it difficult to form a breakdown channel between the electrode terminal and the overlapping region, so that it is not easy for the electrode terminal to short-circuit with the wall portion.

[0015] According to the battery cell provided by some embodiments of the present application, the second recess further includes a side surface connected to the bottom surface. The bottom surface is connected to the outer peripheral surface of the electrode terminal, and the side surface is connected to the end surface. The insulating connector located in the second recess is connected to both the bottom surface and the side surface, and the insulating seal and the insulating connector are connected, so that the insulating connector located in the second recess can completely cover the bottom surface of the second recess, thereby being able to completely separate the bottom surface from the overlapping region.

[0016] According to the battery cell provided by some embodiments of the present application, a part of the insulating seal is located between the bottom surface of the second recess and the overlapping region and overlaps with the insulating connector, so that a part of the insulating seal can overlap with the insulating connector in the thickness direction of the wall portion, making the coverage of the overlapping region by the insulating component more reliable.

[0017] According to the battery cell provided by some embodiments of the present application, in the thickness direction of the wall portion, the depth of the second recess is A, and 0.2 mm ≤ A ≤ 1 mm. This not only enables the second recess to have sufficient dimensions in the thickness direction of the wall portion to set the insulating connector, but also can reduce the influence on the structural strength of the electrode terminal caused by the excessive depth of the second recess in the thickness direction of the wall portion.

[0018] According to the battery cell provided by some embodiments of the present application, in the radial direction of the electrode terminal, the dimension of the second recess is B, and 0.2 mm ≤ B ≤ 1 mm. This not only enables the second recess to have sufficient dimensions in the radial direction of the electrode terminal to allow the insulating connector to cover the overlapping region, but also can reduce the influence on the structural strength of the electrode terminal caused by the excessive depth of the second recess in the radial direction of the electrode terminal.

[0019] According to the battery cell provided by some embodiments of the present application, the insulating connector is an injection-molded structure, which not only helps to improve the overall structural strength of the insulating connector, but also enables the insulating connector to adhere well to the fixing member, the electrode terminal, and the wall portion, which is beneficial to improving the connection strength between the insulating connector and the fixing member, the electrode terminal, and the wall portion.

[0020] According to the battery cell provided by some embodiments of the present application, the insulating assembly further includes an insulating layer. The insulating layer is disposed on the end face of the electrode terminal facing the overlapping region, and / or the insulating layer is disposed on the surface of the overlapping region facing the electrode terminal; in the thickness direction, the projection of the insulating layer is connected to the projection of the insulating connection member located between the electrode terminal and the overlapping region, and the projection of the insulating layer is connected to the projection of the insulating sealant located between the electrode terminal and the overlapping region, so that the insulating layer can completely cover the overlapping region together with the insulating connection member and the insulating sealant in the thickness direction of the wall portion, which is beneficial to reducing the possibility of a breakdown channel appearing between the electrode terminal and the overlapping region.

[0021] In a second aspect, some embodiments of the present application further provide a battery, which includes the battery cell provided by any of the above technical solutions.

[0022] In a third aspect, some embodiments of the present application further provide an electrical device, which includes the battery provided by the above technical solutions, and the battery is used to provide electrical energy.

[0023] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0024] Some embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, an electrode terminal, an insulating assembly, and a fixing member. The wall portion of the housing is provided with an electrode lead-out hole. The electrode assembly is disposed inside the housing. At least a part of the electrode terminal is located outside the wall portion and covers the electrode lead-out hole. The wall portion includes an overlapping region that overlaps with the electrode terminal in the thickness direction of the wall portion; the insulating assembly at least partially surrounds the electrode terminal and is fixed to the electrode terminal, and a part of the insulating assembly is located between the electrode terminal and the overlapping region; in the thickness direction of the wall portion, the part of the insulating assembly located between the overlapping region and the electrode terminal completely covers the overlapping region, and the fixing member is fixedly connected to the wall portion and the insulating assembly. In the above structure, since the part of the insulating assembly located between the overlapping region and the electrode terminal completely covers the overlapping region in the thickness direction, it is not easy to form a breakdown channel between the electrode terminal and the overlapping region, so that it is not easy for the electrode terminal to be short-circuited with the wall portion, which is beneficial to improving the reliability of the battery cell.

[0025] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Description of the Drawings

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Also, throughout the drawings, the same reference numerals are used to denote the same components.

[0027] Figure 1 Schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 Exploded view of a battery provided in some embodiments of the present application;

[0029] Figure 3 Exploded view of a battery cell provided in some embodiments of the present application;

[0030] Figure 4 Top view of a partial structure in a battery cell provided in some embodiments of the present application;

[0031] Figure 5 Exploded view of a partial structure in a battery cell provided in some embodiments of the present application;

[0032] Figure 6 For the first embodiment of the present application in Figure 4 Cross-sectional view taken along line C-C;

[0033] Figure 7 For Figure 6 Enlarged view at location L;

[0034] Figure 8 For the second embodiment of the present application in Figure 4 Cross-sectional view taken along line C-C;

[0035] Figure 9 For Figure 8 Enlarged view at location M;

[0036] Figure 10 For the third embodiment of the present application in Figure 4 Cross-sectional view taken along line C-C;

[0037] Figure 11 For Figure 10 Enlarged view at location D;

[0038] Figure 12 For the fourth embodiment of the present application in Figure 4 Cross-sectional view taken along line C-C;

[0039] Figure 13 For Figure 12 Enlarged view at location E;

[0040] Figure 14This is a cross-sectional view of the fifth embodiment of the present application at Figure 4 at the C-C position;

[0041] Figure 15 is Figure 14 an enlarged view of the position J in

[0042] Figure 16 This is a cross-sectional view of the sixth embodiment of the present application at Figure 4 at the C-C position;

[0043] Figure 17 is Figure 16 an enlarged view of the position F in

[0044] Figure 18 This is a cross-sectional view of the seventh embodiment of the present application at Figure 4 at the C-C position;

[0045] Figure 19 is Figure 18 an enlarged view of the position G in

[0046] Figure 20 This is a cross-sectional view of the eighth embodiment of the present application at Figure 4 at the C-C position;

[0047] Figure 21 is Figure 20 an enlarged view of the position H in

[0048] Figure 22 This is a cross-sectional view of the ninth embodiment of the present application at Figure 4 at the C-C position;

[0049] Figure 23 is Figure 22 an enlarged view of the position I in

[0050] In the drawings:

[0051] 1. Outer shell; 11. Wall portion; 111. Electrode lead-out hole; 112. Overlapping area; 12. Cavity; 2. Electrode assembly; 3. Electrode terminal; 31. Second recess; 311. Bottom surface; 312. Side surface; 4. Insulating assembly; 41. Insulating connecting member; 411. First recess; 42. Insulating seal; 421. Main body portion; 422. Positioning portion; 423. Protruding portion; 43. Insulating layer; 5. Fixing member; 10. Box body; 101. First box body; 102. Second box body; 20. Battery cell; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor. Detailed implementation manners

[0052] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0053] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0054] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0058] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace.

[0059] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can activate the active material through charging and continue to be used after the battery cell discharges.

[0060] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application do not limit this.

[0061] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode.

[0062] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode, and can play a role in preventing short circuit between the positive and negative electrodes, and at the same time can allow active ions to pass through.

[0063] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0064] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0065] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, aluminum with silver surface treatment, stainless steel with silver surface treatment, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material layer includes a positive electrode active material. The positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O 2 ) and their modified compounds, etc.

[0067] In some embodiments, the positive electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or foam alloy, etc. When the metal foam is used as the positive electrode, the positive electrode active material may not be provided on the surface of the metal foam. Of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may also be filled and / or deposited in the metal foam, and the lithium source material is lithium metal and / or lithium-rich material.

[0068] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer provided on at least one surface of the negative electrode current collector.

[0069] As an example, the negative electrode current collector may be made of a metal foil, metal foam, carbon foam, or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, aluminum surface-treated with silver, stainless steel surface-treated with silver, carbon electrodes, carbon, nickel, titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, or foam alloy, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0070] 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. The silicon-based materials may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the negative electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or foam alloy, etc. When the metal foam is used as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the metal foam. Of course, the negative electrode active material may also be provided.

[0072] As an example, a lithium source material, potassium metal, or sodium metal may also be filled and / or deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0073] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0074] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0075] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any publicly known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0076] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0077] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode sheet and the negative electrode sheet, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0078] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0079] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0080] In some embodiments, the electrolyte salt can 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 bis(oxalate) borate, lithium difluoro bis(oxalate) phosphate, and lithium tetrafluorooxalate phosphate.

[0081] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0082] The gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0083] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0084] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0085] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0086] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0087] In some embodiments, the electrode assembly is of a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0088] In some embodiments, the electrode assembly is of a stacked structure.

[0089] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0090] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0091] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0092] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0093] As an example, the separators can be continuously arranged and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0094] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0095] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0096] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly and an electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0097] 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. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0098] The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide a higher voltage and capacity.

[0099] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0100] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0101] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0102] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0103] A battery cell generally includes a housing with a wall portion, an electrode assembly, and an electrode terminal. The electrode terminal for outputting electrical energy outward usually needs to be insulated and arranged on the wall portion to prevent the electrode terminal from being electrically connected to the housing. However, in the prior art, when the electrode terminal is arranged on the wall portion, in the thickness direction of the wall portion, a gap connecting the electrode terminal and the wall portion is easily formed, which makes the gap easily be broken down when there is a large voltage difference between the electrode terminal and the wall portion, and the electrode terminal is short-circuited with the housing.

[0104] To reduce the possibility of short - circuit between the electrode terminal and the housing and improve the reliability of the battery cell, some embodiments of the present application provide a battery cell. The battery cell includes a housing, an electrode assembly, an electrode terminal, an insulating assembly, and a fixing member. An electrode lead - out hole is provided in the wall portion of the housing. The electrode assembly is disposed inside the housing. At least a part of the electrode terminal is located outside the wall portion and covers the electrode lead - out hole. The wall portion includes an overlapping area that overlaps with the electrode terminal in the thickness direction of the wall portion. At least a part of the insulating connecting member in the insulating assembly surrounds the electrode terminal and is fixed to the electrode terminal. At least a part of the insulating sealing member is clamped between the electrode terminal and the overlapping area. At least a part of the insulating connecting member is located between the electrode terminal and the overlapping area and surrounds the insulating sealing member. In the thickness direction of the wall portion, the part of the insulating assembly located between the overlapping area and the electrode terminal completely covers the overlapping area. The fixing member is fixedly connected to the wall portion and the insulating connecting member. In the above structure, since the part of the insulating assembly located between the overlapping area and the electrode terminal completely covers the overlapping area in the thickness direction, it is not easy to form a breakdown channel between the electrode terminal and the overlapping area, so that it is not easy for the electrode terminal to short - circuit with the wall portion, which is beneficial to improving the reliability of the battery cell.

[0105] The battery cell described in the embodiments of the present application is applicable to batteries and electrical devices using batteries. The battery cell can be, but is not limited to, used in batteries, and can also be used in products such as vehicles, airplanes, ships, electronic devices, power tools, etc., and can improve the reliability of these products.

[0106] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and a power tool, etc. The vehicle can be a fuel - powered vehicle, a gas - powered vehicle, or a new - energy vehicle. The new - energy vehicle can be a pure - electric vehicle, a hybrid vehicle, or an extended - range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric - vehicle toy, an electric - ship toy, and an electric - airplane toy, etc.; the power tool includes a metal - cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, and a planer, etc.

[0107] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device in an embodiment of the present application, is taken as an example for illustration.

[0108] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Inside vehicle 1000, there is a battery 100, which can be arranged at the bottom, head, or tail of vehicle 1000. Battery 100 can be used to supply power to vehicle 1000. For example, battery 100 can be used as the operating power source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery 100 to supply power to motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 1000.

[0109] In some embodiments of the present application, battery 100 can not only be used as the operating power source of vehicle 1000, but also as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0110] Please refer to Figure 2 , Figure 2 Explosion diagram of battery 100 provided by some embodiments of the present application. Battery 100 includes a box body 10 and battery cells 20. Battery cells 20 are accommodated in box body 10. Among them, box body 10 is used to provide an accommodation space for battery cells 20. There can be multiple battery cells 20 in battery 100. Multiple battery cells 20 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells 20. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by multiple battery cells 20 is accommodated in box body 10. Of course, battery 100 can also be in the form that multiple battery cells 20 are first connected in series, parallel, or in a mixed connection to form battery modules, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in box body 10.

[0111] Box body 10 can include a first box body 101 and a second box body 102. First box body 101 and second box body 102 cover each other to define a placement space for accommodating battery cells 20. First box body 101 and second box body 102 can be in various shapes, such as a cuboid, a cylinder, etc. First box body 101 can be a hollow structure with one side open, and second box body 102 can also be a hollow structure with one side open. The open side of second box body 102 covers the open side of first box body 101, then box body 10 with a placement space is formed.

[0112] Battery 100 can also include other structures. For example, battery 100 can also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0113] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0114] In some embodiments of the present application, as Figure 3 shown, the battery cell 20 includes a housing 1 and an electrode assembly 2, and the electrode assembly 2 is accommodated in the housing 1. The housing 1 can be a wall structure provided on the outer periphery of the battery cell 20, which can form a cavity 12 for accommodating other components of the battery cell 20 such as the electrode assembly 2 and the electrolyte. The electrode assembly 2, as a component accommodated in the housing 1, is in contact with the electrolyte, and active ions (such as lithium ions) can be conducted between the electrode assembly 2 and the electrolyte.

[0115] Some embodiments of the present application provide a battery cell 20. Continuing to refer to Figure 4 and Figure 5 , the battery cell 20 includes a housing 1, an electrode assembly 2, an electrode terminal 3, an insulating assembly 4, and a fixing member 5. The housing 1 includes a wall portion 11, and the wall portion 11 is provided with an electrode lead-out hole 111; the electrode assembly 2 is disposed in the housing 1; at least a part of the electrode terminal 3 is located outside the wall portion 11 and covers the electrode lead-out hole 111. Referring to Figures 6 to 11 , the wall portion 11 includes an overlapping area 112 that overlaps with the electrode terminal 3 in the thickness direction of the wall portion 11; the insulating assembly 4 at least partially surrounds the electrode terminal 3 and is fixed to the electrode terminal 3, and a part of the insulating assembly 4 is located between the electrode terminal 3 and the overlapping area 112; in the thickness direction of the wall portion 11, the part of the insulating assembly 4 located between the overlapping area 112 and the electrode terminal 3 completely covers the overlapping area 112; the fixing member 5 is fixedly connected to the wall portion 11 and the insulating assembly 4.

[0116] The housing 1 can be a wall structure provided on the outer periphery of the battery cell 20, which can form a cavity 12 for accommodating other components of the battery cell 20 such as the electrode assembly 2 and the electrolyte, and can protect other components of the battery cell 20 such as the electrode assembly 2. The wall portion 11 can be a part of the wall structure of the housing 1, on which the electrode terminal 3 is provided. The electrode lead-out hole 111 can be a through hole provided on the wall portion 11 and penetrating along the thickness direction of the wall portion 11, which communicates the cavity 12 in the housing 1 with the outside.

[0117] The electrode terminal 3, as a component provided on the wall portion 11, can be used for electrically connecting to an electrical device or a charging device outside the battery cell 20, so that the battery cell 20 can be charged and discharged. The electrode terminal 3 can include, but is not limited to, a columnar structure, and those skilled in the art can set it according to actual situations.

[0118] By disposing at least a part of the electrode terminal 3 outside the wall portion 11 and covering the electrode lead-out hole 111, the electrode terminal 3 can block the electrode lead-out hole 111, reducing the risk of electrolyte leakage from the cavity 12 of the housing 1.

[0119] The overlapping region 112 can be the part of the wall portion 11 that overlaps with the electrode terminal 3 in the thickness direction of the wall portion 11. By overlapping with the overlapping region 112, the electrode terminal 3 covers the electrode lead-out hole 111.

[0120] The insulating component 4 can be a plurality of components for insulating the electrode terminal 3 and the wall portion 11. By at least partially surrounding the electrode terminal 3 and fixing to the electrode terminal 3, and partially located between the electrode terminal 3 and the overlapping region 112, the insulating component 4 can be used for isolating the electrode terminal 3 and the overlapping region 112.

[0121] Exemplarily, the insulating component 4 can be formed of an insulating material, so that the insulating component 4 that completely covers the overlapping region 112 has good insulating properties.

[0122] By fixedly connecting the fixing member 5 to the wall portion 11, the fixing member 5 can be connected to the electrode terminal 3 through the insulating component 4, so that the electrode terminal 3 is firmly connected to the wall portion 11.

[0123] By completely covering the overlapping region 112 in the thickness direction of the wall portion 11 with the part of the insulating component 4 located between the overlapping region 112 and the electrode terminal 3, the possibility of a breakdown channel connecting in the thickness direction of the wall portion 11 between the overlapping region 112 and the electrode terminal 3 is reduced.

[0124] In the above structure, since the part of the insulating component 4 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112 in the thickness direction, it is not easy to form a breakdown channel between the electrode terminal 3 and the overlapping region 112, making it not easy for the electrode terminal 3 to be short-circuited with the wall portion 11, which is beneficial to improving the reliability of the battery cell 20.

[0125] In some embodiments, with continued reference to Figure 6 and Figure 7 , the insulating component 4 includes an insulating connecting member 41. The insulating connecting member 41 at least partially surrounds the electrode terminal 3 and fixes the electrode terminal 3 and the wall portion 11. At least a part of the insulating connecting member 41 is located between the electrode terminal 3 and the overlapping region 112. In the thickness direction of the wall portion 11, the part of the insulating connecting member 41 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112.

[0126] The insulating connection member 41 can be a component for insulating and isolating the fixing member 5 and the electrode terminal 3 and connecting the fixing member 5 and the electrode terminal 3. The insulating connection member 41 insulates and connects the electrode terminal 3 to the wall portion 11 by at least partially surrounding the electrode terminal 3 and fixing the electrode terminal 3 and the wall portion 11. By making at least a part of the insulating connection member 41 located between the electrode terminal 3 and the overlapping region 112, and making the part of the insulating connection member 41 located between the overlapping region 112 and the electrode terminal 3 completely cover the overlapping region 112 in the thickness direction of the wall portion 11, the insulating assembly 4 can completely isolate the electrode terminal 3 and the overlapping region 112 through the insulating connection member 41.

[0127] In some embodiments, with continued reference to Figure 8 and Figure 9 , the insulating assembly 4 includes an insulating seal 42 and the insulating connection member 41. The insulating connection member 41 at least partially surrounds the electrode terminal 3 and fixes the electrode terminal 3 and the wall portion 11. The insulating connection member 41 surrounds the outside of the insulating seal 42. At least a part of the insulating seal 42 is clamped between the electrode terminal 3 and the overlapping region 112, and the part of the insulating seal 42 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112.

[0128] The insulating seal 42 is provided at the electrode lead-out hole 111 for sealing the gap between the electrode terminal 3 and the overlapping region 112, to reduce the possibility of electrolyte leaking to the outside through the electrode lead-out hole 111. Similarly, the insulating connection member 41 insulates and connects the electrode terminal 3 to the wall portion 11 by at least partially surrounding the electrode terminal 3 and fixing the electrode terminal 3 and the wall portion 11.

[0129] The insulating seal 42 is provided at the electrode lead-out hole 111, and at least a part of the insulating seal 42 is clamped between the electrode terminal 3 and the overlapping region 112 to seal the gap between the electrode terminal 3 and the overlapping region 112. Exemplarily, the insulating seal 42 has an annular structure, so that in the state of being provided at the electrode lead-out hole 111, the insulating seal 42 can seal the electrode lead-out hole 111 circumferentially by being clamped between the electrode terminal 3 and the overlapping region 112.

[0130] By making the part of the insulating seal 42 located between the overlapping region 112 and the electrode terminal 3 completely cover the overlapping region 112 in the thickness direction of the wall portion 11, the insulating assembly 4 can completely isolate the electrode terminal 3 and the overlapping region 112 through the insulating seal 42.

[0131] In some embodiments, with continued reference to Figure 10 and Figure 11, the insulating component 4 includes an insulating seal 42 and the insulating connecting member 41. The insulating connecting member 41 at least partially surrounds the electrode terminal 3 and fixes the electrode terminal 3 and the wall portion 11. The insulating connecting member 41 surrounds the outside of the insulating seal 42. At least a part of the insulating seal 42 is clamped between the electrode terminal 3 and the overlapping region 112. At least a part of the insulating connecting member 41 is located between the electrode terminal 3 and the overlapping region 112.

[0132] By making the insulating component 4 include the insulating connecting member 41 and the insulating seal 42, and the insulating connecting member 41 surrounds the outside of the insulating seal 42, the insulating seal 42 can seal the gap at the electrode lead hole 111 located inside, and the insulating connecting member 41 can seal the gap near the outside of the electrode terminal 3. The insulating connecting member 41 at least partially surrounds the electrode terminal 3 and fixes the electrode terminal 3 and the wall portion 11, so that the electrode terminal 3 can be insulated and connected to the wall portion 11.

[0133] By making at least a part of both the insulating connecting member 41 and the insulating seal 42 be located between the overlapping region 112 and the electrode terminal 3, the insulating connecting member 41 and the insulating seal 42 can completely cover the overlapping region 112 in the thickness direction of the wall portion 11 together to completely isolate the electrode terminal 3 and the overlapping region 112.

[0134] In some embodiments, a part of the insulating connecting member 41 surrounds the insulating seal 42 and abuts against the outer peripheral surface of the insulating seal 42.

[0135] By arranging a part of the insulating connecting member 41 to surround the insulating seal 42, the insulating connecting member 41 is arranged on the outer ring of the insulating seal 42. By making a part of the insulating connecting member 41 surround the insulating seal 42 and abut against the outer peripheral surface of the insulating seal 42, the insulating seal 42 and the insulating connecting member 41 can completely cover the overlapping region 112 in the thickness direction of the wall portion 11, so that it is not easy to form a breakdown channel between the overlapping region 112 and the electrode terminal 3, and it is not easy for the electrode terminal 3 to be short-circuited with the wall portion 11.

[0136] In some embodiments, in the thickness direction of the wall portion 11, the part of the insulating connecting member 41 located between the electrode terminal 3 and the overlapping region 112 overlaps with the part of the insulating seal 42 clamped between the electrode terminal 3 and the overlapping region 112.

[0137] By arranging the portion of the insulating connection member 41 between the electrode terminal 3 and the overlapping region 112 and the portion of the insulating seal 42 clamped between the electrode terminal 3 and the overlapping region 112 to overlap in the thickness direction of the wall portion 11, there is a partial region between the overlapping region 112 and the electrode terminal 3 that has both the insulating seal 42 and the insulating connection member 41, enabling the insulating connection member 41 and the insulating seal 42 to better completely cover the overlapping region 112.

[0138] In some embodiments, with continued reference to Figure 12 and Figure 13 , a first recess 411 is provided on the side of the insulating connection member 41 facing the overlapping region 112, and a part of the insulating seal 42 is received in the first recess 411.

[0139] The first recess 411 may be a structure formed by the inward depression of the side surface 312 of the insulating connection member 41 facing the overlapping region 112. By providing the first recess 411 on the side of the insulating connection member 41 facing the overlapping region 112, the insulating seal 42 can enter the first recess 411, such that in the thickness direction of the wall portion 11, the insulating seal 42 entering the first recess 411 can be arranged to overlap with the insulating connection member 41, enabling the insulating assembly 4 to better cover the overlapping region 112.

[0140] In some embodiments, the first recess 411 communicates with the inner circumferential surface of the insulating connection member 41, such that a part of the insulating seal 42 located inside the insulating connection member 41 can extend into the first recess 411 from the inside.

[0141] Exemplarily, the insulating seal 42 has an extending portion 423 that protrudes radially outward along the electrode terminal 3, and the extending portion 423 extends into the first recess 411 and overlaps with the insulating connection member 41.

[0142] In some embodiments, the insulating seal 42 includes a connected main body portion 421 and a positioning portion 422. The main body portion 421 is the portion of the insulating seal 42 clamped between the overlapping region 112 and the electrode terminal 3, and the positioning portion 422 is the portion located in the electrode lead-out hole 111. Both the main body portion 421 and the positioning portion 422 are annular structures, and the extending portion 423 protrudes outward from the outer circumferential surface of the main body portion 421. During the installation of the insulating seal 42, by placing the annular positioning portion 422 into the electrode lead-out hole 111, the positioning of the insulating seal 42 at the electrode lead-out hole 111 can be achieved, facilitating the assembly of the battery cell 20.

[0143] In some embodiments, with continued reference to Figures 14 to 19, the electrode terminal 3 has an end face facing the overlapping region 112 and a second recess 31 recessed with respect to the end face. The second recess 31 surrounds the end face and extends to the outer peripheral surface of the electrode terminal 3; the insulating seal 42 completely separates the overlapping region 112 from the end face; a part of the insulating connection member 41 is disposed in the second recess 31 and completely separates the bottom surface 311 of the second recess 31 from the overlapping region 112.

[0144] The end face may be the face of the electrode terminal 3 facing the overlapping region 112 in the thickness direction of the wall portion 11. By providing the second recess 31 recessed with respect to the end face on the end face and extending the second recess 31 to the outer peripheral surface of the electrode terminal 3, the insulating connection member 41 surrounding the electrode terminal 3 can extend into the second recess 31 from the outside of the electrode terminal 3.

[0145] By providing the second recess 31 around the end face, the insulating connection member 41 extending into the second recess 31 is annularly sleeved outside the insulating seal 42.

[0146] By sandwiching the insulating seal 42 between the overlapping region 112 and the end face, the insulating seal 42 completely separates the overlapping region 112 from the end face.

[0147] By disposing a part of the insulating connection member 41 in the second recess 31, a part of the insulating connection member 41 can extend into the second recess 31 to cover the overlapping region 112.

[0148] In the above structure, by completely separating the bottom surface 311 of the second recess 31 from the overlapping region 112 by a part of the insulating connection member 41 and completely separating the overlapping region 112 from the end face by the insulating seal 42, the part of the insulating assembly 4 located between the overlapping region 112 and the electrode terminal 3 can completely cover the overlapping region 112, so that it is not easy to form a breakdown channel between the electrode terminal 3 and the overlapping region 112, and thus it is not easy for the electrode terminal 3 to be short-circuited with the wall portion 11.

[0149] In some embodiments, the second recess 31 further includes a side surface 312 connected to the bottom surface 311. The bottom surface 311 is connected to the outer peripheral surface of the electrode terminal 3, and the side surface 312 is connected to the end face of the electrode terminal 3 facing the overlapping region 112. The insulating connection member 41 located in the second recess 31 is connected to both the bottom surface 311 and the side surface 312, and the insulating seal 42 and the insulating connection member 41 are connected.

[0150] The bottom surface 311 and the side surface 312 are respectively two connected inner surfaces in the second recess 31. Among them, the side surface 312 may be a surface disposed at a relatively spaced interval from the outer peripheral surface of the electrode terminal 3 in the radial direction of the electrode terminal 3. The side surface 312 is connected to the end face, and the bottom surface 311 may be a surface disposed at a relatively spaced interval from the end face of the electrode terminal 3 in the thickness direction of the wall portion 11. The bottom surface 311 is connected to the outer peripheral surface of the electrode terminal 3.

[0151] By connecting the insulating connector 41 located in the second recess 31 to the bottom surface 311 and the side surface 312, the insulating connector 41 located in the second recess 31 can completely cover the bottom surface 311 of the second recess 31, so that the bottom surface 311 can be completely separated from the overlapping area 112.

[0152] The insulating seal 42 is connected to the insulating connector 41. It can be that the insulating connector 41 located in the second recess 31 fills the second recess 31, and the surface of the insulating connector 41 located in the second recess 31 facing the overlapping area 112 is not lower than the end face in the thickness direction of the wall portion 11 and is connected to the insulating seal 42. Exemplarily, it can be, continuing to refer to Figure 14 and Figure 15 , the surface of the insulating connector 41 located in the second recess 31 facing the overlapping area 112 protrudes from the end face in the thickness direction of the wall portion 11, and the outer peripheral surface of the insulating seal 42 abuts and is connected to the inner peripheral surface of the insulating connector 41 located in the second recess 31. In another example, it can also be, continuing to refer to Figure 16 and Figure 17 , the surface of the insulating connector 41 located in the second recess 31 facing the overlapping area 112 is flush with the end face, the outer peripheral surface of the insulating seal 42 is flush with and connected to the insulating connector 41 located in the second recess 31, or as Figure 18 and Figure 19 shown, the outer peripheral surface of the insulating seal 42 is located between the bottom surface 311 of the second recess 31 and the overlapping area 112 and the insulating seal 42 is connected to the insulating connector 41.

[0153] In some embodiments, continuing to refer to Figure 18 and Figure 19 , a part of the insulating seal 42 is located between the bottom surface 311 of the second recess 31 and the overlapping area 112 and overlaps with the insulating connector 41.

[0154] A part of the insulating seal 42 being located between the bottom surface 311 of the second recess 31 and the overlapping area 112 may mean that a part of the insulating seal 42 extends into the space between the bottom surface 311 of the second recess 31 and the overlapping area 112, so that a part of the insulating seal 42 can overlap with the insulating connector 41 in the thickness direction of the wall portion 11, making the coverage of the overlapping area 112 by the insulating assembly 4 more reliable.

[0155] In some embodiments, continuing to refer to Figure 17 , in the thickness direction of the wall portion 11, the depth of the second recess 31 is A, and 0.2 mm ≤ A ≤ 1 mm.

[0156] By setting the range of the depth A of the second recess 31 in the thickness direction of the wall portion 11 to 0.2 mm ≤ A ≤ 1 mm, not only does the second recess 31 have sufficient dimensions in the thickness direction of the wall portion 11 to provide the insulating connection member 41, but also the influence on the structural strength of the electrode terminal 3 caused by an excessive depth of the second recess 31 in the thickness direction of the wall portion 11 can be reduced.

[0157] In some embodiments, 0.3 mm ≤ A ≤ 0.8 mm. Exemplarily, the depth A of the second recess 31 in the thickness direction of the wall portion 11 can be 0.4 mm, 0.5 mm, or 0.7 mm. Not only does the second recess 31 have sufficient dimensions in the thickness direction of the wall portion 11 to provide the insulating connection member 41, but also the influence on the structural strength of the electrode terminal 3 caused by providing the second recess 31 can be reduced.

[0158] In some embodiments, in the radial direction of the electrode terminal 3, the dimension of the second recess 31 is B, and 0.2 mm ≤ B ≤ 1 mm. By setting the range of the dimension B of the second recess 31 in the radial direction of the electrode terminal 3 to 0.2 mm ≤ B ≤ 1 mm, not only does the second recess 31 have sufficient dimensions in the radial direction of the electrode terminal 3 to allow the insulating connection member 41 to cover the overlapping region 112, but also the influence on the structural strength of the electrode terminal 3 caused by an excessive depth of the second recess 31 in the radial direction of the electrode terminal 3 can be reduced.

[0159] In some embodiments, 0.3 mm ≤ B ≤ 0.8 mm. Exemplarily, the dimension B of the second recess 31 in the radial direction of the electrode terminal 3 can be 0.4 mm, 0.5 mm, or 0.7 mm. Not only does the second recess 31 have sufficient dimensions in the radial direction of the electrode terminal 3 to allow the insulating connection member 41 to cover the overlapping region 112, but also the influence on the structural strength of the electrode terminal 3 caused by an excessive depth of the second recess 31 in the radial direction of the electrode terminal 3 can be reduced.

[0160] In some embodiments, the insulating connection member 41 is an injection-molded structure.

[0161] The insulating connection member 41 being an injection-molded structure may mean that the insulating connection member 41 is made by an injection molding process. By making the insulating connection member 41 by an injection molding process, the insulating connection member 41 is an integral structure, which not only helps to improve the overall structural strength of the insulating connection member 41, but also enables the insulating connection member 41 to adhere well to the fixing member 5, the electrode terminal 3, and the wall portion 11, which is beneficial to improving the connection strength between the insulating connection member 41 and the fixing member 5, the electrode terminal 3, and the wall portion 11.

[0162] In some embodiments, continue to refer to Figure 20 and Figure 21, the insulating component 4 further includes an insulating layer 43. The insulating layer 43 is disposed on the end face of the electrode terminal 3 facing the overlapping region 112, and / or the insulating layer 43 is disposed on the surface of the overlapping region 112 facing the electrode terminal 3; the projection of the insulating layer 43 is connected to the projection of the insulating connecting member 41 located between the electrode terminal 3 and the overlapping region 112, and the projection of the insulating layer 43 is connected to the projection of the insulating seal 42 located between the electrode terminal 3 and the overlapping region 112.

[0163] The insulating layer 43 may be a structure for covering the overlapping region 112. It, together with the insulating connecting member 41 and the insulating seal 42, covers the overlapping region 112, so that the overlapping region 112 can be completely covered by the insulating component 4. When the insulating layer 43 is disposed on the end face of the electrode terminal 3 facing the overlapping region 112, it may be that the insulating layer 43 is adhered to the end face of the electrode terminal 3 facing the overlapping region 112 and covers the overlapping region 112. When the insulating layer 43 is disposed on the surface of the overlapping region 112 facing the electrode terminal 3, it may be that the insulating layer 43 is adhered to the surface of the overlapping region 112 facing the electrode terminal 3 and covers the overlapping region 112.

[0164] By making the projection of the insulating layer 43 in the thickness direction connected to the projection of the insulating connecting member 41 located between the electrode terminal 3 and the overlapping region 112 in the thickness direction, and making the projection of the insulating layer 43 in the thickness direction connected to the projection of the insulating seal 42 located between the electrode terminal 3 and the overlapping region 112 in the thickness direction, the insulating layer 43 can completely cover the overlapping region 112 together with the insulating connecting member 41 and the insulating seal 42 in the thickness direction of the wall portion 11, which is beneficial to reducing the possibility of a breakdown channel appearing between the electrode terminal 3 and the overlapping region 112.

[0165] In some embodiments, with continued reference to Figure 22 and Figure 23 , in the thickness direction, the projection of the inner end of the portion of the insulating connecting member 41 located between the electrode terminal 3 and the overlapping region 112 is located within the projection of the insulating layer 43, and the projection of the outer end of the portion of the insulating seal 42 located between the electrode terminal 3 and the overlapping region 112 is located within the projection of the insulating layer 43.

[0166] By making the projection of the inner end of the portion of the insulating connector 41 between the electrode terminal 3 and the overlapping region 112 in the thickness direction of the wall portion 11 located within the projection of the insulating layer 43 in the thickness direction of the wall portion 11, an overlap of the insulating layer 43 in the thickness direction with the insulating connector 41 is achieved; by making the projection of the outer end of the portion of the insulating seal 42 between the electrode terminal 3 and the overlapping region 112 in the thickness direction of the wall portion 11 located within the projection of the insulating layer 43 in the thickness direction of the wall portion 11, an overlap of the insulating layer 43 in the thickness direction with the insulating seal 42 is achieved. Thus, the insulating layer 43 overlaps with both the insulating connector 41 and the insulating seal 42 in the thickness direction of the wall portion 11, enabling the insulating layer 43 to better cover the overlapping region 112 together with the insulating connector 41 and the insulating seal 42, which is conducive to further reducing the possibility of a breakdown channel occurring between the electrode terminal 3 and the overlapping region 112.

[0167] In some embodiments, the insulating layer 43 may be a structure formed by curing a liquid insulating material such as insulating glue or insulating paint, or may be a solid insulating material such as insulating stickers or insulating tapes.

[0168] Some embodiments of the present application further provide a battery 100, which includes the battery cell 20 provided by the above technical solution.

[0169] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0170] Some embodiments of the present application provide a battery cell 20, which includes a housing 1, an electrode assembly 2, an electrode terminal 3, an insulating assembly 4, and a fixing member 5. An electrode lead-out hole 111 is provided in the wall portion 11 of the housing 1. The electrode assembly 2 is disposed inside the housing 1. At least a part of the electrode terminal 3 is located outside the wall portion 11 and covers the electrode lead-out hole 111. The wall portion 11 includes an overlapping region 112 that overlaps with the electrode terminal 3 in the thickness direction of the wall portion 11; a second recess 31 is formed by the depression of the end face of the electrode terminal 3 facing the overlapping region 112. A part of the insulating connector 41 in the insulating assembly 4 is disposed in the second recess 31, and a part of the insulating seal 42 is clamped between the end face and the overlapping region 112 and extends between the bottom surface 311 of the second recess 31 and the overlapping region 112, so that there is a partial overlap between the insulating seal 42 and the insulating connector 41, enabling the insulating assembly 4 to completely cover the overlapping region 112 in the thickness direction, making it difficult to form a breakdown channel between the electrode terminal 3 and the overlapping region 112, and making it difficult for the electrode terminal 3 to be short-circuited with the wall portion 11, which is conducive to improving the reliability of the battery cell 20.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; An electrode assembly is disposed in the housing; an electrode terminal, at least a portion of which is located outside the wall portion and covers the electrode lead-out hole, the wall portion including an overlapping region overlapping the electrode terminal in a thickness direction of the wall portion; an insulating component, the insulating component at least partially surrounding the electrode terminal and being fixed to the electrode terminal, a portion of the insulating component being located between the electrode terminal and the overlapping region; in a thickness direction of the wall portion, a portion of the insulating component located between the overlapping region and the electrode terminal completely covers the overlapping region; A fixing member is fixedly connected to the wall portion and the insulating assembly.

2. The battery cell according to claim 1, characterized in that: The insulating assembly includes an insulating connector, which at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, at least a portion of the insulating connector is located between the electrode terminal and the overlapping area, and in the thickness direction of the wall portion, the portion of the insulating connector located between the overlapping area and the electrode terminal completely covers the overlapping area.

3. The battery cell according to claim 1, characterized in that: The insulating assembly includes an insulating seal and an insulating connector, wherein the insulating connector at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, the insulating connector surrounds the outside of the insulating seal, at least a portion of the insulating seal is sandwiched between the electrode terminal and the overlapping area, and a portion of the insulating seal located between the overlapping area and the electrode terminal completely covers the overlapping area.

4. The battery cell according to claim 2, characterized in that: The insulating assembly includes an insulating seal and an insulating connector, wherein the insulating connector at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, the insulating connector surrounds the outside of the insulating seal, at least a portion of the insulating seal is sandwiched between the electrode terminal and the overlapping area, and at least a portion of the insulating connector is located between the electrode terminal and the overlapping area.

5. The battery cell according to claim 4, characterized in that: A portion of the insulating connector surrounds the insulating seal and abuts against an outer peripheral surface of the insulating seal.

6. The battery cell according to claim 4 or 5, characterized in that: In the thickness direction of the wall portion, a portion of the insulating connector located between the electrode terminal and the overlapping region overlaps with a portion of the insulating seal sandwiched between the electrode terminal and the overlapping region.

7. The battery cell according to claim 6, characterized in that: A first recess is disposed on a side of the insulating connector facing the overlapping region, and a portion of the insulating seal is accommodated in the first recess.

8. The battery cell according to claim 4, characterized in that: The electrode terminal has an end surface facing the overlap region and a second recessed portion recessed relative to the end surface, the second recessed portion surrounds the end surface and extends to the outer peripheral surface of the electrode terminal; The insulating seal completely separates the overlap region from the end surface; A portion of the insulating connector is disposed in the second recess and completely separates the bottom surface of the second recess from the overlapping area.

9. The battery cell according to claim 8, characterized in that: The second recess also includes a side surface connected to the bottom surface, the bottom surface is connected to the outer peripheral surface of the electrode terminal, and the side surface is connected to the end surface. The insulating connector located in the second recess is connected to both the bottom surface and the side surface, and the insulating seal is connected to the insulating connector.

10. The battery cell according to claim 8, characterized in that: A portion of the insulating seal is located between the bottom surface of the second recess and the overlapping area and overlaps the insulating connector.

11. The battery cell according to claim 8, characterized in that: In the thickness direction of the wall portion, the depth of the second recess is A, 0.2 mm ≤ A ≤ 1 mm.

12. The battery cell according to claim 8, characterized in that: In the radial direction of the electrode terminal, the size of the second recess is B, 0.2 mm ≤ B ≤ 1 mm.

13. The battery cell according to claim 2, characterized in that: The insulating connector is an injection-molded structure.

14. The battery cell according to claim 4, characterized in that: The insulating assembly further comprises an insulating layer, wherein the insulating layer is disposed on an end surface of the electrode terminal facing the overlapping region, and / or the insulating layer is disposed on a surface of the overlapping region facing the electrode terminal; In the thickness direction, the projection of the insulating layer is connected to the projection of the portion of the insulating connector located between the electrode terminal and the overlapping area, and the projection of the insulating layer is connected to the projection of the portion of the insulating seal located between the electrode terminal and the overlapping area.

15. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that: Comprising the battery of claim 15, the battery being used to provide electrical energy.

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