Battery cell, battery, and electric device

Abstract

A battery cell (20), a battery (100), and an electric device. The battery cell (20) comprises a casing (1), an electrode terminal (2), an electrode assembly (3), and an insulating member (4). The electrode terminal (2) is arranged on a wall portion (11) of the casing (1). The electrode assembly (3) is accommodated in the casing (1). A first tab (32) of the electrode assembly (3) is electrically connected to the electrode terminal (2). A first insulating portion (41) of the insulating member (4) surrounds the outer side of the first tab (32). A second insulating portion (42) is connected to the first insulating portion (41) and located between the wall portion (11) and the first tab (32). In the structure, the first insulating portion (41) of the insulating member (4) surrounds the outer side of the first tab (32), and the second insulating portion (42) is located between the wall portion (11) and the first tab (32), such that the insulating member (4) can insulate and isolate the first tab (32) from the casing (1), thereby reducing an insulating treatment process such as applying an insulating adhesive to the first tab (32), and thus improving the production efficiency of the battery cell (20).

Description

A battery compartment and battery swapping system for a battery swapping system Technical Field

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

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

[0003] As the application scope of batteries continues to expand, how to improve battery production efficiency has always been a key focus for those skilled in the art.

[0004] Summary of the Invention

[0005] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, wherein the battery cell has high production efficiency.

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, electrode terminals, an electrode assembly, and an insulating member. The housing includes a wall portion; the electrode terminals are disposed in the wall portion; the electrode assembly is housed within the housing, and the electrode assembly includes a first tab that is electrically connected to the electrode terminal; the insulating member includes a first insulating portion and a second insulating portion, the first insulating portion surrounding the outside of the first tab, and the second insulating portion being connected to the first insulating portion and located between the wall portion and the first tab.

[0007] In the above structure, since the first insulating part of the insulating component surrounds the outside of the first electrode tab and the second insulating part is located between the wall and the first electrode tab, the insulating component can insulate and isolate the first electrode tab from the outer shell, reducing the insulation treatment process such as applying insulating adhesive to the first electrode tab, which is beneficial to improving the production efficiency of the battery cell.

[0008] According to some embodiments of the present application, the end face of the first insulating part facing away from the second insulating part has a notch. The notch penetrates the first insulating part along the thickness direction of the first insulating part, so that when the first electrode is inserted into the space enclosed by the first insulating part, the first insulating part can open at the notch, and the opening of the first insulating part facing away from the second insulating part can be increased, so that the first electrode can be inserted into the space enclosed by the first insulating part more easily, which is beneficial to improving the convenience of assembling the battery cell.

[0009] According to some embodiments of the present application, the battery cell has a first insulating portion with multiple notches arranged circumferentially along the first insulating portion, so that the opening of the first insulating portion away from the second insulating portion can be uniformly enlarged, which is beneficial to improving the smoothness of the first tab during insertion.

[0010] According to some embodiments of this application, in a battery cell, the width of the notch in the circumferential direction of the first tab gradually increases along the direction from the first insulating portion to the electrode assembly, which facilitates the opening of the second insulating portion.

[0011] According to some embodiments of this application, the battery cell further includes a current collector connected to a first tab, a first insulating portion enclosing a receiving cavity, the current collector being located in the receiving cavity, and at least a portion of the current collector being located between a second insulating portion and the first tab; a through hole communicating with the receiving cavity is formed on the second insulating portion, and the current collector is connected to the electrode terminal through the through hole.

[0012] According to some embodiments of the present application, the battery cell has a first insulating portion with a size of H1 along the thickness direction of the wall, a current collector with a thickness of H3, and a notch with a size of H4, where H4 ≤ H1 - H3. This allows the current collector to be completely surrounded by the first insulating portion in its circumferential direction, making it less likely for the current collector to leak current to the casing through the notch, which is beneficial to improving the reliability of the battery cell.

[0013] According to some embodiments of the present application, the battery cell includes an electrode assembly that further includes stacked electrode sheets and a separator. A first tab is connected to the electrode sheet and extends out of the separator. Along the thickness direction of the wall portion, the size of the first insulating portion is H1, the size of the first tab extending out of the separator is H2, and the thickness of the current collector is H3, where H1≥H2+H3. This allows the current collector and the portion of the first tab extending out of the separator to be completely located within the accommodating space enclosed by the first insulating portion. This allows the first insulating portion to surround the portion of the current collector and the portion of the first tab extending out of the separator, reducing leakage current from the current collector and the portion of the first tab extending out of the separator to the casing, which is beneficial to improving the reliability of the battery cell.

[0014] According to some embodiments of the present application, the battery cell has a first tab as a columnar body, the length of the first tab along the winding direction is L1, the length of the electrode sheet along the winding direction is L2, and L1 / L2≥50%, which makes the length of the first tab in the winding direction sufficient, which is beneficial to improving the current carrying capacity of the first tab.

[0015] According to some embodiments of this application, the battery cell further includes a current collector connected to a first tab, a first insulating portion enclosing a receiving cavity, the current collector being located within the receiving cavity, and at least a portion of the current collector being located between a second insulating portion and the first tab; a through hole communicating with the receiving cavity is formed on the second insulating portion, and the current collector is connected to an electrode terminal through the through hole; the battery cell also includes an insulating structure disposed on the surface of the wall portion facing the electrode assembly, and at least a portion of the insulating structure being located between the wall portion and the second insulating portion. By positioning at least a portion of the insulating structure between the wall portion and the second insulating portion, the wall portion can press or block the second insulating portion through the insulating structure, which helps to improve the stability of the insulating member installed on the electrode assembly.

[0016] According to some embodiments of this application, in a battery cell, at least a portion of the insulating structure extends out of the inner wall surface of the through hole along the direction from the first insulating portion to the first tab, so that the current collector is insulated from the wall portion, and the at least portion of the insulating structure can cover the through hole and can insulate the insulating member located in the receiving cavity from the wall portion.

[0017] According to some embodiments of this application, at least a portion of the insulating structure extending from the inner wall of the through hole abuts against the current collector to compress the first tab, so that the current collector can compress the first tab under the action of the insulating structure, so that the first tab is in a compressed state, and the first tab can be stably connected to the current collector under the action of its own elastic restoring force.

[0018] According to some embodiments of the present application, the battery cell has an insulating structure at least partially sandwiched between the wall portion and the second insulating portion, such that the insulating structure can push the insulating member to stably cover the end of the electrode assembly, reducing the possibility of the insulating member falling off the electrode assembly.

[0019] According to some embodiments of the present application, the battery cell provided has an annular overlapping area between the projection of the insulating structure and the projection of the second insulating part along the thickness direction of the wall portion. The width of the overlapping area in the radial direction of the first electrode tab is D, where D≥0.8mm, so that the overlapping area has sufficient width to make the pressing or blocking of the second insulating part by the insulating structure stable.

[0020] According to some embodiments of the present application, the wall thickness of the second insulating part is T1 along the thickness direction of the wall portion, where 0.05mm≤T1≤4mm. This ensures that the second insulating part has sufficient thickness to improve the structural strength of the insulating component, while also preventing material waste due to excessive thickness.

[0021] According to some embodiments of the present application, the battery cell is provided in which a first insulating portion surrounds and forms a receiving cavity, and at least a portion of a first tab is received in the receiving cavity; along the direction from the first tab to the first insulating portion, the size of at least a portion of the receiving cavity in the radial direction of the first tab is reduced, so that the current collector and the first tab can be easily inserted from the opening of the receiving cavity away from the second insulating portion.

[0022] According to some embodiments of the present application, the thickness of the end region of the first insulating portion away from the second insulating portion is less than the thickness of the end region of the first insulating portion close to the second insulating portion, so that the first insulating portion changes the radial dimension of the receiving cavity by changing its own wall thickness, so that the current collector and the first tab can be easily inserted from the opening of the receiving cavity away from the second insulating portion.

[0023] According to some embodiments of this application, in the battery cell, along the direction from the first tab to the first insulating portion, the thickness of at least a portion of the first insulating portion gradually increases, so that the thickness of the first insulating portion changes continuously, which helps to reduce the possibility of stress concentration on the first insulating portion.

[0024] According to some embodiments of the present application, the battery cell includes an electrode assembly that further includes a second electrode with a polarity opposite to that of the first electrode, and the second electrode is electrically connected to the casing.

[0025] According to some embodiments of this application, the battery cell has a housing including a shell and an end cap. The shell includes an end wall and a side wall. The side wall surrounds the outer periphery of the end wall. One end of the side wall is connected to the end wall, and the other end forms an opening opposite to the end wall. The end cap covers the opening. The wall portion is either an end wall or an end cap.

[0026] Secondly, some embodiments of this application also provide a battery, which includes the battery cell provided by the aforementioned technical solution.

[0027] Thirdly, some embodiments of this application also provide an electrical device, which includes the battery provided by the aforementioned technical solution, and the battery is used to provide electrical energy.

[0028] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0029] Some embodiments of this application provide a battery cell including a casing, electrode terminals, an electrode assembly, and an insulating member. The electrode terminals are disposed on the wall of the casing, the electrode assembly is housed within the casing, a first tab of the electrode assembly is electrically connected to the electrode terminals, a first insulating portion of the insulating member surrounds the outside of the first tab, and a second insulating portion is connected to the first insulating portion and located between the wall and the first tab. In the above structure, because the first insulating portion of the insulating member surrounds the outside of the first tab and the second insulating portion is located between the wall and the first tab, the insulating member can insulate and isolate the first tab from the casing, reducing the need for insulation treatment processes such as applying insulating adhesive to the first tab, which is beneficial to improving the production efficiency of the battery cell.

[0030] 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

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0032] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0033] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0034] Figure 3 is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0035] Figure 4 is a schematic diagram showing the disassembled battery cell provided in some embodiments of this application;

[0036] Figure 5 is a top view of a battery cell provided in some embodiments of this application;

[0037] Figure 6 is a cross-sectional view at point AA in Figure 5;

[0038] Figure 7 is a front view of the insulating component of a battery cell provided in some embodiments of this application;

[0039] Figure 8 is a top view of the insulating component of a battery cell provided in some embodiments of this application;

[0040] Figure 9 is a cross-sectional view of CC in Figure 8 in some embodiments;

[0041] Figure 10 is a cross-sectional view of CC in Figure 8 in some other embodiments;

[0042] Figure 11 is a front view of the insulating component of a battery cell provided in some other embodiments of this application;

[0043] Figure 12 is an enlarged view of point B in Figure 6.

[0044] In the attached diagram:

[0045] 1. Outer shell; 11. Wall; 12. Housing; 121. End wall; 122. Side wall; 13. End cap; 2. Electrode terminal; 3. Electrode assembly; 32. First tab; 33. Second tab; 34. Separator; 35. Electrode sheet; 4. Insulator; 41. First insulating part; 411. Notch; 412. Receiving cavity; 42. Second insulating part; 421. Through hole; 5. Current collector; 6. Insulation structure; 10. Housing; 101. First housing; 102. Second housing; 20. Battery cell; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0048] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] 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.

[0051] 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.

[0052] 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°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0053] In this application, "multiple" means two or more (including two).

[0054] Currently, judging from market trends, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0055] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0056] 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., but the embodiments of this application are not limited to this.

[0057] A single battery cell typically includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. 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.

[0058] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes, which can prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a layer of positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0061] 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, silver-coated aluminum, silver-coated stainless steel, carbon electrodes, carbon, nickel, or titanium can be used. 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 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.).

[0062] 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 phosphates, lithium transition metal oxides, 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 phosphates 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 oxides 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) 0.80 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0063] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or lithium-rich material.

[0064] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a layer of negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0065] As an example, the negative electrode current collector can be a metal foil, foamed metal, foamed carbon, or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, silver-treated aluminum, silver-treated stainless steel, carbon electrodes, carbon, nickel, or titanium can be used. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloys. 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 (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.).

[0066] 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 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.

[0067] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, 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.

[0068] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0069] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0070] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0071] 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.

[0072] 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0073] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0074] 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.

[0075] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0076] 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.

[0077] 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.

[0078] Gel electrolytes consist of a polymer-based electrolyte backbone network combined with an ionic liquid—lithium salt.

[0079] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0081] 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.

[0082] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0083] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode 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 housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0093] As an example, a 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.

[0094] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0095] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0096] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0097] 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.

[0098] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0099] Currently, in order to achieve insulation between the casing and the electrode assembly, the electrode assembly in the prior art is usually wrapped with insulating adhesive around the outer periphery of the tab. This not only reduces the production efficiency of the battery cell, but also affects the yield of the battery cell due to poor wrapping of the insulating adhesive.

[0100] To improve the production efficiency of battery cells, some embodiments of this application provide a battery cell including a casing, electrode terminals, an electrode assembly, and an insulating member. The electrode terminals are disposed on the wall of the casing, the electrode assembly is housed within the casing, a first tab of the electrode assembly is electrically connected to the electrode terminals, a first insulating portion of the insulating member surrounds the outside of the first tab, and a second insulating portion is connected to the first insulating portion and located between the wall and the first tab. In the above structure, because the first insulating portion of the insulating member surrounds the outside of the first tab and the second insulating portion is located between the wall and the first tab, the insulating member can insulate and isolate the first tab from the casing, reducing the need for insulation treatment processes such as applying insulating adhesive to the first tab, which is beneficial to improving the production efficiency of the battery cell.

[0101] The battery cell described in this application is applicable to batteries and electrical devices that use batteries. This battery cell can be used, but is not limited to, batteries, and can also be used in products such as vehicles, aircraft, ships, electronic devices, and power tools, thereby improving the reliability of these products.

[0102] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. 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.

[0103] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0104] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0105] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0106] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and individual battery cells 20, with the individual battery cells 20 housed within the housing 10. The housing 10 provides space for the individual battery cells 20. There can be multiple individual battery cells 20 in the battery 100, which can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the individual battery cells 20 are connected in series and others in parallel. Multiple individual battery cells 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple individual battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can also be composed of multiple individual battery cells 20 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10.

[0107] The housing 10 may include a first housing 101 and a second housing 102, which overlap each other to define a placement space for accommodating the battery cell 20. The first housing 101 and the second housing 102 may have various shapes, such as cuboids or cylinders. The first housing 101 may be a hollow structure with one open side, and the second housing 102 may also be a hollow structure with one open side. When the open side of the second housing 102 overlaps the open side of the first housing 101, a housing 10 with a placement space is formed.

[0108] The battery 100 may also include other structures, for example, the battery 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0109] 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 to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0110] In some embodiments of this application, as shown in FIG3, the battery cell 20 includes a housing 1 and an electrode assembly 3, the electrode assembly 3 being housed within the housing 1. The housing 1 may be a wall structure disposed on the outer periphery of the battery cell 20, which can form a cavity for accommodating other components of the battery cell 20, such as the electrode assembly 3, and the electrolyte. As a component housed within the housing 1, the electrode assembly 3 is in contact with the electrolyte, and active ions (e.g., lithium ions) can be conducted between the electrode assembly 3 and the electrolyte.

[0111] The outer casing 1 includes an end cap and a housing, the housing having an opening, and the end cap covering the opening.

[0112] In some embodiments of this application, referring again to Figures 4 to 6, some embodiments of this application provide a battery cell 20, which includes a housing 1, electrode terminals 2, electrode assemblies 3, and an insulating member 4. The housing 1 includes a wall portion 11; the electrode terminals 2 are disposed on the wall portion 11; the electrode assembly 3 is housed within the housing 1, and the electrode assembly 3 includes a first tab 32 electrically connected to the electrode terminals 2. Referring again to Figures 7 and 8, the insulating member 4 includes a first insulating portion 41 and a second insulating portion 42. Referring again to Figure 7, the first insulating portion 41 surrounds the outside of the first tab 32, and the second insulating portion 42 is connected to the first insulating portion 41 and located between the wall portion 11 and the first tab 32.

[0113] In this embodiment, the outer casing 1 of the battery cell 20 may include an end cap 13 and a housing 12, which are sealed together to form a receiving space for accommodating components such as the electrode assembly 3. Exemplarily, the housing 12 may be a cylindrical structure with an opening at at least one end, and the end cap 13 seals and covers the opening. The end cap 13 and the housing 12 together form the receiving space for accommodating components such as the electrode assembly 3 and the electrolyte. The wall portion 11 may be a part of the outer casing 1; it may be the end cap 13 or a part of the housing 12.

[0114] The electrode terminal 2 can be a connection terminal disposed on the wall 11 of the housing 1, which is electrically connected to the electrode assembly 3 in the battery cell 20 and protrudes outward from the housing 1. The electrode terminal 2 is used to electrically connect to external electrical equipment to deliver electrical energy to the external electrical equipment. The electrode terminal 2 includes, but is not limited to, a cylindrical structure, and can also be other shapes such as a prism structure.

[0115] The electrode assembly 3 may include a first tab 32, an electrode 35, and a separator 34. The electrode 35 may include a positive electrode and a negative electrode with opposite polarities, which can serve as the positive and negative electrodes, respectively. The separator 34 is stacked between the positive and negative electrode plates to isolate them. The surface of the positive current collector in the positive electrode plate is coated with a positive active material layer, and the surface of the negative current collector in the negative electrode plate is coated with a negative active material layer. The first tab 32 is connected to the positive or negative current collector and extends from the end of the positive or negative current collector facing the wall 11. The first tab 32 is electrically connected to the electrode terminal 2, allowing the electrode 35 to be electrically connected to the electrode terminal 2.

[0116] The insulating component 4 can be a component with insulating properties, and it can be made of insulating materials such as rubber and plastic. The first insulating part 41 and the second insulating part 42 are respectively partial structures in the insulating component 4, and the two are connected to each other. The first insulating part 41 surrounds the outside of the first electrode 32, and the first insulating part 41 can be a cylindrical structure. The first insulating part 41 is fitted onto the outside of the first electrode 32 to achieve insulation between the first electrode 32 and the outer shell 1.

[0117] The second insulating part 42 may be a portion connected to the end of the first insulating part 41. The second insulating part 42 is connected to the end of the first insulating part 41 along its own axial direction, such that when the first insulating part 41 is fitted over the outside of the first electrode tab 32, the second insulating part 42 is located between the wall part 11 and the first electrode tab 32, and is used to insulate between the first electrode tab 32 and the wall part 11.

[0118] In the above structure, since the first insulating part 41 of the insulating member 4 surrounds the outside of the first electrode 32 and the second insulating part 42 is located between the wall part 11 and the first electrode 32, the insulating member 4 can insulate and isolate the first electrode 32 from the outer shell 1, reducing the insulation treatment process such as applying insulating glue to the first electrode 32, which is beneficial to improving the production efficiency of the battery cell 20.

[0119] For example, the insulating member 4 is a one-piece molded structure. The first insulating part 41 and the second insulating part 42 can be integrally molded using an injection molding process, so that the insulating member 4 has good structural strength.

[0120] In some embodiments, referring further to Figures 9 to 12, the end face of the first insulating portion 41 facing away from the second insulating portion 42 is provided with a notch 411, and the notch 411 penetrates the first insulating portion 41 along the thickness direction of the first insulating portion 41.

[0121] The notch 411 can be a structure formed by removing material from the first insulating portion 41. By providing an inwardly recessed notch 411 on the end face of the first insulating portion 41 opposite to the second insulating portion 42, and by making the notch 411 penetrate the first insulating portion 41 along its thickness direction, the first insulating portion 41 can open at the notch 411 as the first tab 32 extends into the space enclosed by the first insulating portion 41. This increases the opening of the first insulating portion 41 away from the second insulating portion 42, making it easier for the first tab 32 to be inserted into the space enclosed by the first insulating portion 41, which improves the ease of assembling the battery cell 20.

[0122] In some embodiments, the first insulating portion 41 is provided with a plurality of notches 411, which are arranged circumferentially along the first insulating portion 41.

[0123] By providing multiple notches 411 on the first insulating part 41 and arranging the multiple notches 411 around the circumference of the first insulating part 41, the opening of the first insulating part 41 away from the second insulating part 42 can be enlarged more easily as the first electrode 32 extends into the space enclosed by the first insulating part 41, further facilitating the insertion of the first electrode 32 into the space enclosed by the first insulating part 41.

[0124] Multiple notches 411 are arranged circumferentially along the first insulating part 41. These notches 411 can be equally spaced along the circumferential direction of the first insulating part 41, so that the opening of the first insulating part 41 away from the second insulating part 42 can be uniformly enlarged, which is beneficial to improving the smoothness of the first electrode tab 32 during insertion.

[0125] In some embodiments, continuing to refer to FIG12, along the direction from the first insulating portion 41 to the electrode assembly 3, the width of the notch 411 in the circumferential direction of the first tab 32 gradually increases.

[0126] By setting the width of the notch 411 in the circumferential direction of the first electrode tab 32 to gradually increase along the direction from the first insulating part 41 to the electrode assembly 3, the notch 411 can form a V-shaped structure with the opening facing away from the first insulating part 41, which facilitates the opening of the second insulating part 42.

[0127] In some embodiments, continuing to refer to FIG7, the battery cell 20 further includes a current collector 5 connected to the first tab 32, the first insulating portion 41 enclosing to form an accommodating cavity 412, the current collector 5 being located in the accommodating cavity 412, and at least a portion of the current collector 5 being located between the second insulating portion 42 and the first tab 32; a through hole 421 communicating with the accommodating cavity 412 is formed on the second insulating portion 42, and the current collector 5 is connected to the electrode terminal 2 through the through hole 421.

[0128] The current collector 5 can be a component connected to multiple first tabs 32 in the electrode assembly 3, which can collect the current drawn from multiple first tabs 32 to facilitate the electrical connection between the first tabs 32 and the electrode terminal 2.

[0129] The inner cavity 412 may be the space enclosed by the first insulating part 41, which is used to accommodate the current collector 5 and at least part of the first electrode 32.

[0130] The through hole 421 can be a hole-like structure provided on the second insulating part 42 that extends along the thickness direction of the second insulating part 42. Since the second insulating part 42 is provided with a through hole 421 extending along the thickness direction of the second insulating part 42, the through hole 421 connects the inner cavity 412 to the outside, and the current collector 5 located in the inner cavity 412 can be connected to the electrode terminal 2 through the through hole 421.

[0131] At least a portion of the current collector 5 is located between the second insulating portion 42 and the first electrode tab 32. This can mean that the diameter of the current collector 5 is larger than the diameter of the through hole 421, a portion of the current collector 5 is located between the second insulating portion 42 and the first electrode tab 32, and another portion of the current collector 5 corresponds to the through hole 421 and is electrically connected to the electrode terminal 2 through the through hole 421.

[0132] In some embodiments, along the thickness direction of the wall portion 11, the size of the first insulating portion 41 is H1, the thickness of the current collector 5 is H3, the size of the notch 411 is H4, and H4≤H1-H3.

[0133] The dimension of the first insulating part 41 in the thickness direction of the wall 11 is set to H1, the thickness of the current collector 5 in the thickness direction of the wall 11 is set to H3, and the dimension of the notch 411 in the thickness direction of the wall 11 is set to H4, and H4≤H1-H3, so that the dimension of the inner cavity 412 in the thickness direction of the wall 11 minus the depth of the current collector 5 in the thickness direction of the wall 11 is greater than the dimension of the notch 411 in the thickness direction of the wall 11, so that the current collector 5 can be completely surrounded by the first insulating part 41 in its circumference, and the current collector 5 is less likely to leak current to the housing 12 through the notch 411, which is beneficial to improving the reliability of the battery cell 20.

[0134] In some embodiments, H4≤H1-H3-0.2mm, so that the current collector 5 can be better completely surrounded by the first insulating part 41 in its circumferential direction, and the current collector 5 is less likely to leak current to the housing 12 through the notch 411, which is beneficial to improving the reliability of the battery cell 20.

[0135] In some embodiments, the electrode assembly 3 further includes a stacked electrode 35 and an isolator 34, a first tab 32 is connected to the electrode 35 and extends out of the isolator 34; along the thickness direction of the wall portion 11, the size of the first insulating portion 41 is H1, the size of the first tab 32 extending out of the isolator 34 is H2, the thickness of the current collector 5 is H3, and H1≥H2+H3.

[0136] The first tab 32 is a component provided on the electrode 35 for electrical connection with the current collector 5 of the battery cell 20. It is located at the end of the electrode 35 along the thickness direction of the wall portion 11, so that the end of the electrode 35 along the thickness direction of the wall portion 11 can be connected to the current collector 5 through the first tab 32.

[0137] For example, by providing a plurality of first tabs 32 at intervals at the ends of the electrode 35, the electrode 35 can transmit electrical energy uniformly and stably to other components through the plurality of first tabs 32.

[0138] The stacked arrangement of the electrode 35 and the separator 34 can refer to the electrode assembly 3 having a stacked structure, with the sheet-like electrode 35 and separator 34 stacked layer by layer; or it can refer to the electrode assembly 3 having a wound structure, with the strip-shaped electrode 35 and separator 34 stacked and wound along the winding direction.

[0139] The connection between the first tab 32 and the electrode 35 can refer to the connection between the first tab 32 and the current collector in the electrode 35. By extending the first tab 32 out of the isolator 34, the first tab 32 can lead the current of the electrode 35 outward.

[0140] The dimension of the first insulating part 41 in the thickness direction of the wall 11 is set to H1, the dimension of the first tab 32 extending out of the separator 34 in the thickness direction of the wall 11 is set to H2, and the thickness of the current collector 5 in the thickness direction of the wall 11 is set to H3. By making H1≥H2+H3, the current collector 5 and the portion of the first tab 32 extending out of the separator 34 can be completely located in the accommodating space enclosed by the first insulating part 41. This allows the first insulating part 41 to surround the portion of the current collector 5 and the portion of the first tab 32 extending out of the separator 34, reducing leakage current from the portion of the current collector 5 and the portion of the first tab 32 extending out of the separator 34 to the housing 12, which is beneficial to improving the reliability of the battery cell 20.

[0141] In some embodiments, the first tab 32 is a columnar body, the length of the first tab 32 along the winding direction is L1, the length of the electrode 35 along the winding direction is L2, and L1 / L2≥50%.

[0142] Referring to Figure 3, the electrode assembly 3 has a wound structure, and the first electrode tab 32 is a columnar body. It can be that the first electrode tab 32, which extends out of the isolation member 34, has been flattened into a columnar structure.

[0143] By setting the length of the first tab 32 along the winding direction to L1 and the length of the electrode 35 along the winding direction to L2, and making L1 / L2≥50%, the length of the first tab 32 in the winding direction is sufficient, which is beneficial to improving the current carrying capacity of the first tab 32.

[0144] For example, the ratio L1 / L2 of the length L1 of the first electrode 32 along the winding direction to the length L2 of the electrode 35 along the winding direction can be 50%, 60% or 70%, so that the length of the first electrode 32 in the winding direction is sufficient, which is beneficial to improving the current carrying capacity of the first electrode 32.

[0145] In some embodiments, the battery cell 20 further includes a current collector 5 connected to the first tab 32, the first insulating portion 41 enclosing a receiving cavity 412, the current collector 5 being located in the receiving cavity 412, and at least a portion of the current collector 5 being located between the second insulating portion 42 and the first tab 32; a through hole 421 communicating with the receiving cavity 412 is formed on the second insulating portion 42, and the current collector 5 is connected to the electrode terminal 2 through the through hole 421; the battery cell 20 further includes an insulating structure 6, the insulating structure 6 being disposed on the surface of the wall portion 11 facing the electrode assembly 3, and at least a portion of the insulating structure 6 being located between the wall portion 11 and the second insulating portion 42.

[0146] The insulating structure 6 can refer to a structure with insulating properties, which can be made of insulating materials such as rubber and plastic. The insulating structure 6 is disposed on the surface of the wall portion 11 facing the electrode assembly 3. Alternatively, the insulating structure 6 can be formed on the surface of the wall portion 11 facing the electrode assembly 3 by using the wall portion 11 as an insert to form the insulating material.

[0147] By positioning at least a portion of the insulating structure 6 between the wall portion 11 and the second insulating portion 42, the wall portion 11 can press or block the second insulating portion 42 through the insulating structure 6, which helps to improve the stability of the insulating member 4 installed on the electrode assembly 3.

[0148] In some embodiments, at least a portion of the insulating structure 6 extends out of the inner wall surface of the through hole 421 in the direction from the first insulating portion 41 to the first tab 32 so that the current collector 5 is insulated from the wall portion 11.

[0149] By extending at least a portion of the insulating structure 6 out of the inner wall surface of the through hole 421 in the direction from the first insulating portion 41 to the first tab 32, the at least portion of the insulating structure 6 can cover the through hole 421 and can insulate the insulating member 4 located in the receiving cavity 412 from the wall portion 11.

[0150] In some embodiments, at least a portion of the insulating structure 6 extending from the inner wall of the through hole 421 abuts against the current collector 5 to compress the first tab 32.

[0151] By having at least a portion of the insulating structure 6 extending from the inner wall of the through hole 421 abut against the current collector 5, the current collector 5 is able to squeeze the first tab 32 under the action of the insulating structure 6, so that the first tab 32 is in a compressed state, and the first tab 32 can be stably connected to the current collector 5 under the action of its own elastic restoring force.

[0152] In some embodiments, at least a portion of the insulating structure 6 is sandwiched between the wall portion 11 and the second insulating portion 42.

[0153] By sandwiching at least a portion of the insulating structure 6 between the wall portion 11 and the second insulating portion 42, the insulating structure 6 can push the insulating member 4 to stably cover the end of the electrode assembly 3, reducing the possibility of the insulating member 4 falling off the electrode assembly 3.

[0154] In some embodiments, along the thickness direction of the wall portion 11, the overlapping area of ​​the projection of the insulating structure 6 and the projection of the second insulating portion 42 is annular, and the width of the overlapping area in the radial direction of the first electrode tab 32 is D, where D≥0.8mm.

[0155] By setting the overlapping area of ​​the projection of the insulating structure 6 in the thickness direction of the wall portion 11 and the projection of the second insulating portion 42 in the thickness direction of the wall portion 11 to be annular, the insulating structure 6 presses or blocks the second insulating portion 42 around the through hole 421, which helps to improve the stability of the action on the second insulating portion 42.

[0156] By setting the width D of the overlapping area in the radial direction of the first tab 32 to D≥0.8mm, the overlapping area has sufficient width to ensure that the pressing or blocking of the second insulating part 42 by the insulating structure 6 is stable.

[0157] For example, the width D of the overlapping area in the radial direction of the first tab 32 can be set to 0.8 mm, 1 mm or 1.2 mm, so that the pressing or blocking of the second insulating part 42 by the insulating structure 6 is stable.

[0158] In some embodiments, along the thickness direction of the wall portion 11, the wall thickness of the second insulating portion 42 is T1, where 0.05mm≤T1≤4mm.

[0159] By setting the wall thickness T1 of the second insulating part 42 in the thickness direction of the wall part 11 to a range of 0.05mm≤T1≤4mm, the second insulating part 42 has sufficient thickness to improve the structural strength of the insulating member 4, and the second insulating part 42 is not prone to material waste due to excessive thickness.

[0160] In some embodiments, 0.1mm ≤ T1 ≤ 2mm. For example, T1 can be set to 0.5mm, 1mm or 1.5mm, so that the second insulating portion 42 has sufficient thickness to improve the structural strength of the insulating member 4, and the second insulating portion 42 is not prone to material waste due to excessive thickness.

[0161] In some embodiments, the first insulating portion 41 surrounds to form a receiving cavity 412, and at least a portion of the first tab 32 is received in the receiving cavity 412; along the direction from the first tab 32 to the first insulating portion 41, the size of at least a portion of the receiving cavity 412 in the radial direction of the first tab 32 decreases.

[0162] By reducing the radial dimension of at least a portion of the receiving cavity 412 in the direction from the first tab 32 to the first insulating portion 41, the radial dimension of the receiving cavity 412 away from the first insulating portion 41 is greater than the radial dimension near the first insulating portion 41, so that the current collector 5 and the first tab 32 can be easily inserted from the opening of the receiving cavity 412 away from the second insulating portion 42.

[0163] For example, the size of at least part of the cavity 412 in the radial direction of the first tab 32 may be gradually reduced, so that the radial dimension of the cavity 412 is continuously changing; or the size of at least part of the cavity 412 in the radial direction of the first tab 32 may be stepped, so that the radial dimension of the cavity 412 is discontinuously changing.

[0164] In some embodiments, the thickness of the end region of the first insulating portion 41 away from the second insulating portion 42 is less than the thickness of the end region of the first insulating portion 41 near the second insulating portion 42.

[0165] By setting the thickness of the end region of the first insulating part 41 away from the second insulating part 42 to be less than the thickness of the end region of the first insulating part 41 near the second insulating part 42, the first insulating part 41 changes the radial dimension of the receiving cavity 412 by changing its own wall thickness, so that the current collector 5 and the first electrode 32 can be conveniently inserted from the opening of the receiving cavity 412 away from the second insulating part 42.

[0166] For example, the thickness variation of the first insulating portion 41 can be continuous or stepped, and those skilled in the art can change the thickness of the first insulating portion 41 according to the actual situation.

[0167] In some embodiments, continuing to refer to FIG11, along the direction from the first tab 32 to the first insulating portion 41, the thickness of at least a portion of the first insulating portion 41 gradually increases.

[0168] By setting the thickness of at least a portion of the first insulating portion 41 to gradually increase along the direction from the first tab 32 to the first insulating portion 41, the thickness of the first insulating portion 41 is continuously varied, which helps to reduce the possibility of stress concentration on the first insulating portion 41.

[0169] In some embodiments, the electrode assembly 3 further includes a second electrode 33 with the opposite polarity to the first electrode 32, and the second electrode 33 is electrically connected to the housing 1.

[0170] The second electrode 33 can be a component that leads the current from the electrode 35 outward, with the polarity opposite to that of the first electrode 32. The second electrode 33 extends out of the isolator 34 and is electrically connected to the housing 1.

[0171] In some embodiments, the housing 1 includes a housing 12 and an end cap 13. The housing 12 includes an end wall 121 and a side wall 122. The side wall 122 surrounds the outer periphery of the end wall 121. One end of the side wall 122 is connected to the end wall 121, and the other end forms an opening opposite to the end wall 121. The end cap 13 covers the opening. The wall portion 11 is either the end wall 121 or the end cap 13.

[0172] The housing 12 can be a cylindrical structure with an opening at one end, and an end cap 13 seals and covers the opening. The end cap 13 and the housing 12 together form a receiving space for accommodating the electrode assembly 3, the insulating component 4, and other components, as well as the electrolyte. The side wall 122 can be a structure surrounding the end wall 121 within the housing 12, with one end of the side wall 122 connected to the end wall 121 and the other end forming an opening opposite to the end wall 121. Exemplarily, the housing 12 is an integrally formed structure, and the end wall 121 and the side wall 122 are integrally formed by a stamping process.

[0173] The wall portion 11 in this application can be an end wall 121 or an end cap 13, so that the electrode terminal 2 is located at the end of the battery cell 20, which facilitates the battery cell 20 to output electrical energy.

[0174] Some embodiments of this application also provide a battery 100, which includes the battery cell 20 provided by the above-described technical solution.

[0175] Some embodiments of this application also provide an electrical device, which includes the battery 100 provided by the above-described technical solution, the battery 100 being used to provide electrical energy.

[0176] Some embodiments of this application provide a battery cell 20, which includes a housing 1, electrode terminals 2, electrode assembly 3, current collector 5, and insulating member 4. The electrode terminals 2 are disposed on the wall portion 11 of the housing 1. The electrode assembly 3 is located inside the housing 1, and a first tab 32 on it is connected to the current collector 5. The current collector 5 and the first tab 32 are located in the receiving cavity 412 formed by the insulating member 4. The first insulating portion 41 of the insulating member 4 surrounds the outside of the first tab 32 and the current collector 5. The current collector 5 is connected to the electrode terminals 2 through a through hole 421 in the second insulating portion 42. The end face of the first insulating portion 41 opposite to the second insulating portion 42 is provided with a notch 411 penetrating the first insulating portion 41. In the above structure, since the first insulating part 41 of the insulating member 4 surrounds the outside of the first electrode 32 and the second insulating part 42 is located between the wall part 11 and the first electrode 32, the insulating member 4 can insulate and isolate the first electrode 32 from the outer shell 1, reducing the insulation treatment process such as applying insulating glue to the first electrode 32, which is beneficial to improving the production efficiency of the battery cell 20.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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 outer casing, including the walls; Electrode terminals are disposed on the wall portion; An electrode assembly is housed within the housing, the electrode assembly including a first tab, the first tab being electrically connected to the electrode terminal; An insulating element includes a first insulating portion and a second insulating portion, the first insulating portion surrounding the outside of the first electrode tab, and the second insulating portion connected to the first insulating portion and located between the wall portion and the first electrode tab.

2. The battery cell according to claim 1, characterized in that, The end face of the first insulating part facing away from the second insulating part has a notch, and the notch penetrates the first insulating part along the thickness direction of the first insulating part.

3. The battery cell according to claim 2, characterized in that, The first insulating portion has a plurality of notches, which are arranged circumferentially along the first insulating portion.

4. The battery cell according to claim 2 or 3, characterized in that, Along the direction from the first insulating portion toward the electrode assembly, the width of the notch gradually increases in the circumferential direction of the first tab.

5. The battery cell according to any one of claims 2 to 4, characterized in that, The battery cell further includes a current collector connected to the first electrode tab, the first insulating portion encloses and forms an accommodating cavity, the current collector is located in the accommodating cavity, and at least a portion of the current collector is located between the second insulating portion and the first electrode tab; The second insulating part has a through hole that communicates with the inner cavity of the accommodating part, and the current collector is connected to the electrode terminal through the through hole.

6. The battery cell according to claim 5, characterized in that, Along the thickness direction of the wall portion, the size of the first insulating portion is H1, the thickness of the current collector is H3, and the size of the notch is H4, where H4 ≤ H1 - H3.

7. The battery cell according to any one of claims 5 to 6, characterized in that, The electrode assembly further includes stacked electrode plates and insulating members, the first electrode tab is connected to the electrode plate and extends out of the insulating member; along the thickness direction of the wall portion, the size of the first insulating portion is H1, the size of the first electrode tab extending out of the insulating member is H2, the thickness of the current collector is H3, and H1≥H2+H3.

8. The battery cell according to claim 7, characterized in that, The first electrode tab is a columnar body, the length of the first electrode tab along the winding direction is L1, the length of the electrode sheet along the winding direction is L2, and L1 / L2≥50%.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The battery cell further includes a current collector connected to the first electrode tab, the first insulating portion encloses and forms an accommodating cavity, the current collector is located in the accommodating cavity, and at least a portion of the current collector is located between the second insulating portion and the first electrode tab; The second insulating portion has a through hole communicating with the accommodating cavity, and the current collector is connected to the electrode terminal through the through hole; The battery cell further includes an insulating structure disposed on the surface of the wall portion facing the electrode assembly, with at least a portion of the insulating structure located between the wall portion and the second insulating portion.

10. The battery cell according to claim 9, characterized in that, Along the direction from the first insulating portion to the first electrode tab, at least a portion of the insulating structure extends out of the inner wall surface of the through hole to insulate the current collector from the wall portion.

11. The battery cell according to claim 10, characterized in that, At least a portion of the insulating structure extending from the inner wall of the through hole abuts against the current collector to compress the first tab.

12. The battery cell according to any one of claims 9 to 11, characterized in that, At least a portion of the insulating structure is sandwiched between the wall portion and the second insulating portion.

13. The battery cell according to any one of claims 9 to 12, characterized in that, Along the thickness direction of the wall portion, the overlapping area of ​​the projection of the insulating structure and the projection of the second insulating portion is annular, and the width of the overlapping area in the radial direction of the first electrode tab is D, where D≥0.8mm.

14. The battery cell according to any one of claims 1 to 13, characterized in that, Along the thickness direction of the wall portion, the wall thickness of the second insulating portion is T1, where 0.05mm≤T1≤4mm.

15. The battery cell according to any one of claims 1 to 14, characterized in that, The first insulating portion encloses and forms a receiving cavity, and at least a portion of the first electrode tab is received within the receiving cavity; Along the direction from the first tab to the first insulating portion, at least a portion of the receiving cavity decreases in size radially from the first tab.

16. The battery cell according to any one of claims 1 to 15, characterized in that, The thickness of the end region of the first insulating portion away from the second insulating portion is less than the thickness of the end region of the first insulating portion near the second insulating portion.

17. The battery cell according to claim 16, characterized in that, Along the direction from the first tab to the first insulating portion, the thickness of at least a portion of the first insulating portion gradually increases.

18. The battery cell according to any one of claims 1 to 17, characterized in that, The electrode assembly also includes a second electrode with a polarity opposite to that of the first electrode, and the second electrode is electrically connected to the housing.

19. The battery cell according to any one of claims 1 to 18, characterized in that, The outer casing includes a housing and an end cap. The housing includes an end wall and a side wall. The side wall surrounds the outer periphery of the end wall. One end of the side wall is connected to the end wall, and the other end forms an opening opposite to the end wall. The end cap covers the opening. The wall portion is either the end wall or the end cap.

20. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 19.

21. An electrical appliance, characterized in that, Includes the battery as described in claim 20, the battery being used to provide electrical energy.

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