Battery cell, battery, and electric device

Abstract

The present application provides a battery cell, a battery, and an electric device. A wall portion of the battery cell comprises overlapping regions that overlap with electrode terminals in a thickness direction of the wall portion; each insulating assembly at least partially surrounds the corresponding electrode terminal and is fixed to the electrode terminal, and a portion of each insulating assembly is located between the corresponding electrode terminal and the corresponding overlapping region; in the thickness direction of the wall portion, the portion of each insulating assembly located between the corresponding overlapping region and the corresponding electrode terminal completely covers the overlapping region; and each fixing member is fixedly connected to the wall portion and the corresponding insulating assembly. Since the portion of each insulating assembly located between the corresponding overlapping region and the corresponding electrode terminal completely covers the overlapping region in the thickness direction, a breakdown channel is not prone to formation between the electrode terminals and the overlapping regions, so that the electrode terminals are not prone to short-circuiting with the wall portion, facilitating improvement of the reliability of the battery cell.

Description

Battery cell, battery and electric device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202421463577.1, filed on June 25, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, and in particular relates to a battery cell, a battery and an electric device. BACKGROUND

[0004] Batteries have high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools, etc.

[0005] With the increasing application range of batteries, how to improve the reliability of batteries has attracted more and more attention of those skilled in the art.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which have good reliability.

[0008] In a first aspect, some embodiments of the present application provide a battery cell, which comprises a shell, an electrode assembly, an electrode terminal, an insulation assembly and a fixing member, the shell comprises a wall portion, the wall portion is provided with an electrode lead-out hole; the electrode assembly is arranged in the shell; at least part of the electrode terminal is located outside the wall portion and covers the electrode lead-out hole, the wall portion comprises an overlapping region overlapping the electrode terminal in the thickness direction of the wall portion; the insulation assembly at least partially surrounds the electrode terminal and is fixed to the electrode terminal, part of the insulation assembly is located between the electrode terminal and the overlapping region; in the thickness direction of the wall portion, the part of the insulation assembly located between the overlapping region and the electrode terminal completely covers the overlapping region; the fixing member is fixedly connected to the wall portion and the insulation assembly.

[0009] In the above structure, since the part of the insulation assembly located between the overlapping region and the electrode terminal completely covers the overlapping region in the thickness direction, a breakdown channel is not easily formed between the electrode terminal and the overlapping region, so that the electrode terminal is not easily short-circuited with the wall portion, which is beneficial to improve the reliability of the battery cell.

[0010] According to the battery cell provided by some embodiments of the present application, the insulation assembly comprises an insulation connector, the insulation connector at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, at least part of the insulation connector is located between the electrode terminal and the overlapping area, and in the thickness direction of the wall portion, the part of the insulation connector located between the overlapping area and the electrode terminal completely covers the overlapping area, so that the insulation assembly can completely isolate the electrode terminal and the overlapping area through the insulation connector.

[0011] According to the battery cell provided by some embodiments of the present application, the insulation assembly comprises an insulation connector, the insulation connector at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, at least part of the insulation connector is located between the electrode terminal and the overlapping area, and in the thickness direction of the wall portion, the part of the insulation connector located between the overlapping area and the electrode terminal completely covers the overlapping area, so that the insulation assembly can completely isolate the electrode terminal and the overlapping area through the insulation connector.

[0012] According to the battery cell provided by some embodiments of the present application, the insulation assembly further comprises an insulation connector and an insulation sealing member, the insulation connector at least partially surrounds the electrode terminal and fixes the electrode terminal and the wall portion, the insulation connector is located outside the insulation sealing member, at least part of the insulation sealing member is clamped between the electrode terminal and the overlapping area, and at least part of the insulation connector is located between the electrode terminal and the overlapping area, so that the insulation connector and the insulation sealing member together completely cover the overlapping area in the thickness direction of the wall portion to completely isolate the electrode terminal and the overlapping area.

[0013] According to the battery cell provided by some embodiments of the present application, part of the insulation connector surrounds the insulation sealing member and abuts against the outer circumferential surface of the insulation sealing member, so that the insulation sealing member and the insulation connector can completely cover the overlapping area in the thickness direction of the wall portion, so that a breakdown channel is not easily formed between the overlapping area and the electrode terminal, and the electrode terminal is not easily short-circuited with the wall portion.

[0014] 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 insulation connector located between the electrode terminal and the overlapping area overlaps with the part of the insulation sealing member clamped between the electrode terminal and the overlapping area, so that there is a partial area between the overlapping area and the electrode terminal which has both the insulation sealing member and the insulation connector, so that the insulation connector and the insulation sealing member can better completely cover the overlapping area.

[0015] According to the battery cell provided by some embodiments of the present application, the insulation connecting piece is provided with a first recess on the side facing the overlapping area, and a part of the insulation sealing piece is accommodated in the first recess, so that the insulation sealing piece in the first recess can be arranged in overlapping manner with the insulation connecting piece in the thickness direction of the wall part, so that the insulation assembly can better cover the overlapping area.

[0016] According to the battery cell provided by some embodiments of the present application, the electrode terminal has an end face facing the overlapping area 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 insulation sealing piece completely separates the overlapping area from the end face; a part of the insulation connecting piece is arranged in the second recess and completely separates the bottom surface of the second recess from the overlapping area.

[0017] In the above structure, by making a part of the insulation connecting piece completely separate the bottom surface of the second recess from the overlapping area and making the insulation sealing piece completely separate the overlapping area from the end face, the part of the insulation assembly between the overlapping area and the electrode terminal can completely cover the overlapping area, so that a breakdown channel is not easily formed between the electrode terminal and the overlapping area, thereby preventing the electrode terminal from being short-circuited with the wall part.

[0018] 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 face; the insulation connecting piece in the second recess is connected to both the bottom surface and the side surface; the insulation sealing piece is connected to the insulation connecting piece, so that the insulation connecting piece in the second recess can completely cover the bottom surface of the second recess, thereby completely separating the bottom surface from the overlapping area.

[0019] According to the battery cell provided by some embodiments of the present application, a part of the insulation sealing piece is located between the bottom surface of the second recess and the overlapping area and overlaps the insulation connecting piece, so that the part of the insulation sealing piece can be arranged in overlapping manner with the insulation connecting piece in the thickness direction of the wall part, so that the insulation assembly can more reliably cover the overlapping area.

[0020] According to the battery cell provided by some embodiments of the present application, in the thickness direction of the wall part, the depth of the second recess is A, and 0.2mm≤A≤1mm, not only making the second recess have sufficient size in the thickness direction of the wall part to arrange the insulation connecting piece, but also reducing the influence of the excessive depth of the second recess in the thickness direction of the wall part on the structural strength of the electrode terminal.

[0021] According to the battery cell provided by some embodiments of the present application, the size of the second recess in the radial direction of the electrode terminal is B, and 0.2mm≤B≤1mm, which not only makes the second recess have a sufficient size in the radial direction of the electrode terminal to cover the overlapping area by the insulating connecting piece, but also reduces the impact of the excessive depth of the second recess in the radial direction of the electrode terminal on the structural strength of the electrode terminal.

[0022] According to the battery cell provided by some embodiments of the present application, the insulating connecting piece is an injection molding structure, which not only helps to improve the overall structural strength of the insulating connecting piece, but also enables the insulating connecting piece to be well adhered to the fixing piece, the electrode terminal and the wall part, and helps to improve the connection strength between the insulating connecting piece and the fixing piece, the electrode terminal and the wall part.

[0023] According to the battery cell provided by some embodiments of the present application, the insulating assembly further comprises an insulating layer, the insulating layer is arranged on the end surface of the electrode terminal facing the overlapping area, and / or the insulating layer is arranged on the surface of the overlapping area facing the electrode terminal; in the thickness direction, the projection of the insulating layer is connected with the projection of the part of the insulating connecting piece between the electrode terminal and the overlapping area, and the projection of the insulating layer is connected with the projection of the part of the insulating sealing piece between the electrode terminal and the overlapping area, so that the insulating layer can completely cover the overlapping area together with the insulating connecting piece and the insulating sealing piece in the thickness direction of the wall part, which helps to reduce the possibility of the breakdown channel between the electrode terminal and the overlapping area.

[0024] In a second aspect, some embodiments of the present application further provide a battery, which comprises the battery cell provided by any of the above technical solutions.

[0025] In a third aspect, some embodiments of the present application further provide a power utilization device, which comprises the battery provided by the above technical solutions, and the battery is used to provide electric energy.

[0026] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0027] Some embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly, an electrode terminal, an insulation assembly and a fixing member, a wall portion of the shell is provided with an electrode lead-out hole, the electrode assembly is arranged in the shell, at least part of the electrode terminal is located outside the wall portion and covers the electrode lead-out hole, the wall portion comprises an overlapping area overlapping the electrode terminal in a thickness direction of the wall portion; the insulation assembly at least partially surrounds the electrode terminal and is fixed to the electrode terminal, part of the insulation assembly is located between the electrode terminal and the overlapping area; in the thickness direction of the wall portion, the part of the insulation assembly between the overlapping area and the electrode terminal completely covers the overlapping area, and the fixing member is fixedly connected to the wall portion and the insulation assembly. In the above structure, since the part of the insulation assembly between the overlapping area and the electrode terminal completely covers the overlapping area in the thickness direction, a breakdown channel is not easily formed between the electrode terminal and the overlapping area, so that the electrode terminal is not easily short-circuited with the wall portion, which is beneficial to improve the reliability of the battery monomer.

[0028] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the content of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the several figures represent similar parts.

[0030] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0031] FIG. 2 is a split schematic diagram of a battery provided by some embodiments of the present application;

[0032] FIG. 3 is a split schematic diagram of a battery monomer provided by some embodiments of the present application;

[0033] FIG. 4 is a top view of part of the structure of the battery monomer provided by some embodiments of the present application;

[0034] FIG. 5 is a split schematic diagram of part of the structure of the battery monomer provided by some embodiments of the present application;

[0035] FIG. 6 is a sectional view at C-C in FIG. 4 of the first embodiment of the present application;

[0036] FIG. 7 is an enlarged view at L in FIG. 6;

[0037] FIG. 8 is a sectional view at C-C in FIG. 4 of the second embodiment of the present application;

[0038] Fig. 9 is an enlarged view of M in Fig. 8;

[0039] Fig. 10 is a sectional view of the third embodiment of the present application at C-C in Fig. 4;

[0040] Fig. 11 is an enlarged view of D in Fig. 10;

[0041] Fig. 12 is a sectional view of the fourth embodiment of the present application at C-C in Fig. 4;

[0042] Fig. 13 is an enlarged view of E in Fig. 12;

[0043] Fig. 14 is a sectional view of the fifth embodiment of the present application at C-C in Fig. 4;

[0044] Fig. 15 is an enlarged view of J in Fig. 14;

[0045] Fig. 16 is a sectional view of the sixth embodiment of the present application at C-C in Fig. 4;

[0046] Fig. 17 is an enlarged view of F in Fig. 16;

[0047] Fig. 18 is a sectional view of the seventh embodiment of the present application at C-C in Fig. 4;

[0048] Fig. 19 is an enlarged view of G in Fig. 18;

[0049] Fig. 20 is a sectional view of the eighth embodiment of the present application at C-C in Fig. 4;

[0050] Fig. 21 is an enlarged view of H in Fig. 20;

[0051] Fig. 22 is a sectional view of the ninth embodiment of the present application at C-C in Fig. 4;

[0052] Fig. 23 is an enlarged view of I in Fig. 22.

[0053] In the drawings: 1, housing; 11, wall portion; 111, electrode lead hole; 112, overlapping region; 12, 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 sealing member; 421, main body portion; 422, positioning portion; 423, protruding portion; 43, insulating layer; 5, fixing member; 10, case; 101, first case; 102, second case; 20, battery cell; 1000, vehicle; 100, battery; 200, controller; 300, motor. DETAILED DESCRIPTION

[0054] The technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by the skilled in the art to which the embodiments of the present application belong.

[0056] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0057] In addition, the technical terms “first”, “second” and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of “a plurality of” is two or more, unless otherwise explicitly specified and limited.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements or mutual action relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is “on” or “under” the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature can be directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0060] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace and other fields.

[0061] In the embodiment of the application, the battery monomer can be a secondary battery monomer, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0062] The battery monomer can be a lithium ion battery monomer, a sodium ion battery monomer, a sodium lithium ion battery monomer, a lithium metal battery monomer, a sodium metal battery monomer, a lithium sulfur battery monomer, a magnesium ion battery monomer, a nickel hydrogen battery monomer, a nickel cadmium battery monomer, a lead storage battery monomer, etc. The embodiment of the application is not limited thereto.

[0063] The battery monomer generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. In the charging and discharging process of the battery monomer, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode.

[0064] In some embodiments, the electrode assembly further includes a separator, which is arranged between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0065] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material layer arranged on at least one surface of the positive electrode current collector.

[0066] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material layer is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0067] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, silver surface treated aluminum, silver surface treated stainless steel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a high 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 high polymer material base material (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material layer includes a positive electrode active material. The positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0069] In some embodiments, the positive electrode can employ a foamed carbon or a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When the foamed metal is used as a positive electrode, the foamed metal surface can not be provided with a positive electrode active material, or of course, a positive electrode active material can be provided. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0070] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0071] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, a foamed carbon, or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, silver surface-treated aluminum, silver surface-treated stainless steel, a carbon electrode, a carbon, nickel, or titanium, or the like can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0072] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, or the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone only one or two or more can be used in combination.

[0073] In some embodiments, the negative electrode can employ a foamed carbon or a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, or the like. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative electrode active material, or of course, a negative electrode active material can be provided.

[0074] As an example, a lithium source material, a potassium metal, or a sodium metal can also be filled or / and deposited in the negative electrode current collector, and the lithium source material is a lithium metal and / or a lithium-rich material.

[0075] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0076] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0077] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0078] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0079] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode sheet and the negative electrode sheet, and functions to transport ions and separate the positive and negative electrodes.

[0080] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0081] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0082] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0083] In some embodiments, the solvent can 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, 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, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0084] The gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0085] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0086] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0087] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0088] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0089] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0090] In some embodiments, the electrode assembly is in a stack structure.

[0091] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0092] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0093] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0094] As an example, a plurality of separators can be provided, and each of the plurality of separators can be disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0095] As an example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0096] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0097] In some embodiments, the electrode assembly can be provided with a tab. The tab can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0098] In some embodiments, the battery cell can include a housing. The housing can be used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0099] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0100] The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0101] 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.

[0102] In some embodiments, the battery can be a battery pack, the battery pack including a box and battery cells, the battery cells or battery modules being accommodated in the box.

[0103] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and longitudinal beam of the vehicle.

[0104] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0105] The battery cell generally includes a casing having a wall portion, an electrode assembly, and an electrode terminal, the electrode terminal outputting electric energy to the outside generally needs to be insulated on the wall portion to avoid electrical connection between the electrode terminal and the casing. However, in the prior art, when the electrode terminal is arranged on the wall portion, a gap connecting the electrode terminal and the wall portion is easily formed in the thickness direction of the wall portion, 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 casing.

[0106] In order to reduce the possibility of short circuit between the electrode terminal and the shell and improve the reliability of the battery monomer, some embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly, an electrode terminal, an insulation assembly and a fixing member, the wall portion of the shell is provided with an electrode lead-out hole, the electrode assembly is arranged in the shell, at least part of the electrode terminal is located outside the wall portion and covers the electrode lead-out hole, the wall portion comprises an overlapping area which overlaps the electrode terminal in the thickness direction of the wall portion; the insulation assembly comprises an insulation connecting piece which at least partially surrounds the electrode terminal and is fixed to the electrode terminal, at least part of the insulation sealing piece is clamped between the electrode terminal and the overlapping area, at least part of the insulation connecting piece is located between the electrode terminal and the overlapping area and surrounds the insulation sealing piece, and in the thickness direction of the wall portion, the part of the insulation assembly between the overlapping area and the electrode terminal completely covers the overlapping area, and the fixing member is fixedly connected to the wall portion and the insulation connecting piece. In the above structure, since the part of the insulation assembly 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 the electrode terminal is not easy to be short-circuited with the wall portion, which is beneficial to improve the reliability of the battery monomer.

[0107] The battery monomer described in the embodiments of the present application is suitable for batteries and electric devices using batteries. The battery monomer can be used in batteries, but is not limited to this, and can also be used in vehicles, aircraft, ships, electronic devices, electric tools and other products, which can improve the reliability of these products.

[0108] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0109] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0110] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0111] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0112] Please refer to FIG. 2, which is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cell 20. The battery cell 20 in the battery 100 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the box body 10.

[0113] The box body 10 can include a first box body 101 and a second box body 102, and the first box body 101 and the second box body 102 are overlapped with each other to define a placement space for accommodating the battery cell 20. The first box body 101 and the second box body 102 can be various shapes, such as a cuboid, a cylinder, etc. The first box body 101 can be a hollow structure with one side open, and the second box body 102 can also be a hollow structure with one side open. The open side of the second box body 102 is overlapped with the open side of the first box body 101, and then the box body 10 with the placement space is formed.

[0114] The battery 100 can further include other structures, for example, the battery 100 can further include a current combing component for realizing electrical connection between the multiple battery cells 20.

[0115] Each battery cell 20 can be a secondary battery or a primary battery, and can 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 the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0116] In some embodiments of the present application, as shown in FIG. 3, the battery cell 20 includes a housing 1 and an electrode assembly 2 accommodated in the housing 1. The housing 1 can be a wall structure arranged at the outer periphery of the battery cell 20, which can form a cavity 12 for accommodating the electrode assembly 2 and other components of the battery cell 20 and an electrolyte. The electrode assembly 2, as a component accommodated in the housing 1, is in contact with the electrolyte, and active ions (e.g., lithium ions) can be conducted between the electrode assembly 2 and the electrolyte.

[0117] Some embodiments of the present application provide a battery cell 20, with reference to FIGS. 4 and 5, which 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 provided with an electrode lead-out hole 111. The electrode assembly 2 is arranged in the housing 1. At least part of the electrode terminal 3 is located outside the wall portion 11 and covers the electrode lead-out hole 111. With reference to FIGS. 6 to 11, the wall portion 11 includes an overlapping region 112 overlapping 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. Part of the insulating assembly 4 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 assembly 4 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112. The fixing member 5 is fixedly connected to the wall portion 11 and the insulating assembly 4.

[0118] The housing 1 can be a wall structure arranged at the outer periphery of the battery cell 20, which can form a cavity 12 for accommodating the electrode assembly 2 and other components of the battery cell 20 and an electrolyte, and can protect the electrode assembly 2 and other components of the battery cell 20. The wall portion 11 can be a part of the wall structure in the housing 1, on which the electrode terminal 3 is arranged. The electrode lead-out hole 111 can be a through hole arranged on the wall portion 11 and penetrating through the wall portion 11 in the thickness direction of the wall portion 11, which connects the cavity 12 in the housing 1 with the outside.

[0119] The electrode terminal 3, as a component arranged on the wall portion 11, can be used to electrically connect with a power consumption device or a charging device outside the battery cell 20, so that the battery cell 20 can be charged or discharged. The electrode terminal 3 can include but is not limited to a columnar structure, which can be arranged according to actual conditions by those skilled in the art.

[0120] By disposing at least 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, and the risk of leakage of the electrolyte from the accommodation cavity 12 of the case 1 is reduced.

[0121] The overlapping region 112 can be a portion of the wall portion 11 that overlaps the electrode terminal 3 in the thickness direction of the wall portion 11, and the electrode terminal 3 is covered by the overlapping region 112.

[0122] The insulation assembly 4 can be a plurality of components for insulating the electrode terminal 3 and the wall portion 11. The insulation assembly 4 is configured to at least partially surround the electrode terminal 3 and be fixed to the electrode terminal 3, and is partially located between the electrode terminal 3 and the overlapping region 112, so that the insulation assembly 4 can be used to isolate the electrode terminal 3 and the overlapping region 112.

[0123] Exemplarily, the insulation assembly 4 can be formed of an insulating material, so that the insulation assembly 4 completely covering the overlapping region 112 has good insulation performance.

[0124] 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 insulation assembly 4, so that the electrode terminal 3 is firmly connected to the wall portion 11.

[0125] By completely covering the overlapping region 112 in the thickness direction of the wall portion 11 with the portion of the insulation assembly 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.

[0126] In the above structure, since the portion of the insulation assembly 4 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112 in the thickness direction, a breakdown channel is not easily formed between the electrode terminal 3 and the overlapping region 112, so that the electrode terminal 3 is not easily short-circuited with the wall portion 11, which is beneficial to improve the reliability of the battery monomer 20.

[0127] In some embodiments, continuing to refer to FIGS. 6 and 7, the insulation assembly 4 includes an insulation connecting member 41 that at least partially surrounds the electrode terminal 3 and fixes the electrode terminal 3 and the wall portion 11, at least part of the insulation connecting member 41 is located between the electrode terminal 3 and the overlapping region 112, and the portion of the insulation connecting member 41 located between the overlapping region 112 and the electrode terminal 3 completely covers the overlapping region 112 in the thickness direction of the wall portion 11.

[0128] The insulating connecting member 41 can be a member for insulating and connecting the fixing member 5 and the electrode terminal 3. The insulating connecting 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 locating at least a portion of the insulating connecting member 41 between the electrode terminal 3 and the overlapping region 112 and by locating the portion of the insulating connecting member 41 between the overlapping region 112 and the electrode terminal 3 so as to completely cover the overlapping region 112 in the thickness direction of the wall portion 11, the insulating assembly 4 can completely insulate the electrode terminal 3 and the overlapping region 112 by the insulating connecting member 41.

[0129] In some embodiments, with continued reference to FIGS. 8 and 9, the insulating assembly 4 includes the insulating seal 42 and the insulating connecting member 41, the insulating connecting member 41 at least partially surrounding the electrode terminal 3 and fixing the electrode terminal 3 and the wall portion 11, the insulating connecting member 41 being located outside the insulating seal 42, at least a portion of the insulating seal 42 being located between the electrode terminal 3 and the overlapping region 112, and the portion of the insulating seal 42 between the overlapping region 112 and the electrode terminal 3 completely covering the overlapping region 112.

[0130] The insulating seal 42 is provided at the electrode lead-out hole 111 to seal the gap between the electrode terminal 3 and the overlapping region 112, thereby reducing the possibility of leakage of the electrolyte to the outside through the electrode lead-out hole 111. Similarly, the insulating connecting 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.

[0131] The insulating seal 42 is provided at the electrode lead-out hole 111, and at least a portion of the insulating seal 42 is located between the electrode terminal 3 and the overlapping region 112 to seal the gap between the electrode terminal 3 and the overlapping region 112. Illustratively, the insulating seal 42 has a ring shape so that the insulating seal 42 can seal the electrode lead-out hole 111 in the circumferential direction by being located between the electrode terminal 3 and the overlapping region 112 when provided at the electrode lead-out hole 111.

[0132] By locating the portion of the insulating seal 42 between the overlapping region 112 and the electrode terminal 3 so as to completely cover the overlapping region 112 in the thickness direction of the wall portion 11, the insulating assembly 4 can completely insulate the electrode terminal 3 and the overlapping region 112 by the insulating seal 42.

[0133] In some embodiments, with continued reference to FIGS. 10 and 11, the insulation assembly 4 includes the insulation seal 42 and the insulation connector 41 that at least partially surrounds the electrode terminal 3 and secures the electrode terminal 3 and the wall portion 11, the insulation connector 41 being disposed outside the insulation seal 42, at least a portion of the insulation seal 42 being sandwiched between the electrode terminal 3 and the overlap region 112, and at least a portion of the insulation connector 41 being located between the electrode terminal 3 and the overlap region 112.

[0134] By having the insulation assembly 4 include the insulation connector 41 and the insulation seal 42, the insulation connector 41 being disposed outside the insulation seal 42, the insulation seal 42 is able to seal the gap at the electrode lead-out hole 111 on the inside, and the insulation connector 41 is able to seal the gap close to the outside of the electrode terminal 3. The insulation connector 41 is able to insulate the electrode terminal 3 from the wall portion 11 by at least partially surrounding the electrode terminal 3 and securing the electrode terminal 3 and the wall portion 11.

[0135] By having the insulation connector 41 and the insulation seal 42 both have at least a portion located between the overlap region 112 and the electrode terminal 3, the insulation connector 41 and the insulation seal 42 together completely cover the overlap region 112 in the thickness direction of the wall portion 11 to completely isolate the electrode terminal 3 and the overlap region 112.

[0136] In some embodiments, a portion of the insulation connector 41 is disposed around the insulation seal 42 and abuts the outer circumferential surface of the insulation seal 42.

[0137] By having a portion of the insulation connector 41 disposed around the insulation seal 42, the insulation connector 41 is disposed outside the insulation seal 42. By having a portion of the insulation connector 41 disposed around the insulation seal 42 and abutting the outer circumferential surface of the insulation seal 42, the insulation seal 42 and the insulation connector 41 are able to completely cover the overlap region 112 in the thickness direction of the wall portion 11, so that a breakdown channel is less likely to be formed between the overlap region 112 and the electrode terminal 3, and the electrode terminal 3 is less likely to short circuit with the wall portion 11.

[0138] In some embodiments, in the thickness direction of the wall portion 11, the portion of the insulation connector 41 located between the electrode terminal 3 and the overlap region 112 overlaps the portion of the insulation seal 42 sandwiched between the electrode terminal 3 and the overlap region 112.

[0139] By configuring the portion of the insulating connecting member 41 between the electrode terminal 3 and the overlapping region 112 and the portion of the insulating seal 42 between the electrode terminal 3 and the overlapping region 112 to overlap in the thickness direction of the wall portion 11, the overlapping region 112 and the electrode terminal 3 are both covered by the insulating seal 42 and the insulating connecting member 41, so that the insulating seal 42 and the insulating connecting member 41 can better cover the overlapping region 112.

[0140] In some embodiments, with continued reference to FIGS. 12 and 13, the side of the insulating connecting member 41 facing the overlapping region 112 is provided with a first recess 411, and a portion of the insulating seal 42 is accommodated in the first recess 411.

[0141] The first recess 411 can be a structure in which the side 312 of the insulating connecting member 41 facing the overlapping region 112 is recessed inward. By providing the first recess 411 on the side of the insulating connecting member 41 facing the overlapping region 112, the insulating seal 42 can enter the first recess 411, so that in the thickness direction of the wall portion 11, the insulating seal 42 entering the first recess 411 can overlap the insulating connecting member 41, so that the insulating assembly 4 can better cover the overlapping region 112.

[0142] In some embodiments, the first recess 411 is in communication with the inner circumferential surface of the insulating connecting member 41, so that a portion of the insulating seal 42 inside the insulating connecting member 41 can extend into the first recess 411 from the inside.

[0143] Exemplarily, the insulating seal 42 has a protruding portion 423 protruding radially outward from the electrode terminal 3, the protruding portion 423 extends into the first recess 411 and overlaps the insulating connecting member 41.

[0144] In some embodiments, the insulating seal 42 includes a main body portion 421 and a positioning portion 422 connected to each other, the main body portion 421 is a portion of the insulating seal 42 clamped between the overlapping region 112 and the electrode terminal 3, and the positioning portion 422 is a 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 protruding portion 423 protrudes outward from the outer circumferential surface of the main body portion 421. During installation of the insulating seal 42, by placing the positioning portion 422 in the form of an annular structure into the electrode lead-out hole 111, the positioning of the insulating seal 42 at the electrode lead-out hole 111 can be achieved, so that the assembly of the battery monomer 20 is facilitated.

[0145] In some embodiments, with continued reference to FIGS. 14-19, the electrode terminal 3 has an end surface facing the overlapping region 112 and a second recess 31 recessed with respect to the end surface, the second recess 31 encircling the end surface and extending to an outer peripheral surface of the electrode terminal 3; the insulating seal 42 completely separates the overlapping region 112 from the end surface; a portion of the insulating connector 41 is disposed in the second recess 31 and completely separates a bottom surface 311 of the second recess 31 from the overlapping region 112.

[0146] The end surface can be a surface of the electrode terminal 3 facing the overlapping region 112 in a thickness direction of the wall portion 11. By providing the second recess 31 recessed with respect to the end surface on the end surface and extending the second recess 31 to the outer peripheral surface of the electrode terminal 3, the insulating connector 41 surrounding the electrode terminal 3 can extend into the second recess 31 from an outer side of the electrode terminal 3.

[0147] By providing the second recess 31 encircling the end surface, the insulating connector 41 extending into the second recess 31 is annularly fitted outside the insulating seal 42.

[0148] By sandwiching the insulating seal 42 between the overlapping region 112 and the end surface, the insulating seal 42 completely separates the overlapping region 112 from the end surface.

[0149] By disposing a portion of the insulating connector 41 in the second recess 31, a portion of the insulating connector 41 can extend into the second recess 31 to cover the overlapping region 112.

[0150] In the above structure, by having a portion of the insulating connector 41 completely separate the bottom surface 311 of the second recess 31 from the overlapping region 112, the insulating seal 42 completely separates the overlapping region 112 from the end surface, the portion of the insulating assembly 4 between the overlapping region 112 and the electrode terminal 3 can completely cover the overlapping region 112, so that a breakdown path is not easily formed between the electrode terminal 3 and the overlapping region 112, thereby preventing the electrode terminal 3 from short-circuiting with the wall portion 11.

[0151] In some embodiments, the second recess 31 further includes a side surface 312 connected to the bottom surface 311, the bottom surface 311 being connected to the outer peripheral surface of the electrode terminal 3, the side surface 312 being connected to the end surface of the electrode terminal 3 facing the overlapping region 112, the insulating connector 41 in the second recess 31 being connected to both the bottom surface 311 and the side surface 312, and the insulating seal 42 being connected to the insulating connector 41.

[0152] The bottom surface 311 and the side surface 312 are two connected inner surfaces in the second recess 31, respectively. The side surface 312 can be a surface arranged opposite to the outer circumferential surface of the electrode terminal 3 in the radial direction of the electrode terminal 3, and the side surface 312 is connected to the end surface. The bottom surface 311 can be a surface arranged opposite to the end surface of the electrode terminal 3 in the thickness direction of the wall portion 11, and the bottom surface 311 is connected to the outer circumferential surface of the electrode terminal 3.

[0153] By connecting the insulation connecting piece 41 in the second recess 31 to the bottom surface 311 and the side surface 312, the insulation connecting piece 41 in the second recess 31 can completely cover the bottom surface 311 of the second recess 31, so as to completely separate the bottom surface 311 from the overlapping area 112.

[0154] The insulation connecting piece 41 in the second recess 31 can be filled in the second recess 31, and the surface of the insulation connecting piece 41 in the second recess 31 towards the overlapping area 112 is not lower than the end surface in the thickness direction of the wall portion 11 and is connected to the insulation sealing piece 42. For example, with reference to FIGS. 14 and 15, the surface of the insulation connecting piece 41 in the second recess 31 towards the overlapping area 112 protrudes from the end surface in the thickness direction of the wall portion 11, and the outer circumferential surface of the insulation sealing piece 42 is connected to the inner circumferential surface of the insulation connecting piece 41 in the second recess 31. In another example, with reference to FIGS. 16 and 17, the surface of the insulation connecting piece 41 in the second recess 31 towards the overlapping area 112 is flush with the end surface, and the outer circumferential surface of the insulation sealing piece 42 is flush with and connected to the insulation connecting piece 41 in the second recess 31. Alternatively, as shown in FIGS. 18 and 19, the outer circumferential surface of the insulation sealing piece 42 is located between the bottom surface 311 of the second recess 31 and the overlapping area 112, and the insulation sealing piece 42 is connected to the insulation connecting piece 41.

[0155] In some embodiments, with reference to FIGS. 18 and 19, a part of the insulation sealing piece 42 is located between the bottom surface 311 of the second recess 31 and the overlapping area 112 and overlaps the insulation connecting piece 41.

[0156] The part of the insulation sealing piece 42 located between the bottom surface 311 of the second recess 31 and the overlapping area 112 can mean that the part of the insulation sealing piece 42 extends into the bottom surface 311 of the second recess 31 and the overlapping area 112, so that the part of the insulation sealing piece 42 can be arranged to overlap the insulation connecting piece 41 in the thickness direction of the wall portion 11, so that the insulation assembly 4 is more reliable in covering the overlapping area 112.

[0157] In some embodiments, with reference to FIG. 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.

[0158] 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 a sufficient size in the thickness direction of the wall portion 11 to provide the insulating connecting piece 41, but also the influence on the structural strength of the electrode terminal 3 caused by the second recess 31 having too large a depth in the thickness direction of the wall portion 11 can be reduced.

[0159] In some embodiments, 0.3 mm≤A≤0.8 mm, and 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 a sufficient size in the thickness direction of the wall portion 11 to provide the insulating connecting piece 41, but also the influence on the structural strength of the electrode terminal 3 caused by the second recess 31 can be reduced.

[0160] In some embodiments, in the radial direction of the electrode terminal 3, the size of the second recess 31 is B, and 0.2 mm≤B≤1 mm. By setting the range of the size 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 a sufficient size in the radial direction of the electrode terminal 3 to cover the overlapping region 112 by the insulating connecting piece 41, but also the influence on the structural strength of the electrode terminal 3 caused by the second recess 31 having too large a depth in the radial direction of the electrode terminal 3 can be reduced.

[0161] In some embodiments, 0.3 mm≤B≤0.8 mm, and exemplarily, the size 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 a sufficient size in the radial direction of the electrode terminal 3 to cover the overlapping region 112 by the insulating connecting piece 41, but also the influence on the structural strength of the electrode terminal 3 caused by the second recess 31 having too large a depth in the radial direction of the electrode terminal 3 can be reduced.

[0162] In some embodiments, the insulating connecting piece 41 is an injection molded structure.

[0163] The insulating connecting piece 41 being an injection molded structure can mean that the insulating connecting piece 41 is made by an injection molding process. By making the insulating connecting piece 41 by an injection molding process, the insulating connecting piece 41 is a monolithic structure, not only beneficial to improve the overall structural strength of the insulating connecting piece 41, but also beneficial to make the insulating connecting piece 41 well adhere to the fixing member 5, the electrode terminal 3, and the wall portion 11, and beneficial to improve the connecting strength of the insulating connecting piece 41 with the fixing member 5, the electrode terminal 3, and the wall portion 11.

[0164] In some embodiments, with reference to Figs. 20 and 21, the insulation assembly 4 further comprises an insulation layer 43 disposed on the end surface of the electrode terminal 3 facing the overlapping region 112, and / or disposed on the surface of the overlapping region 112 facing the electrode terminal 3; the projection of the insulation layer 43 is connected to the projection of the insulation connector 41 and the projection of the insulation seal 42 between the electrode terminal 3 and the overlapping region 112.

[0165] The insulation layer 43 can be a structure for covering the overlapping region 112, which, together with the insulation connector 41 and the insulation seal 42, covers the overlapping region 112, so that the overlapping region 112 can be completely covered by the insulation assembly 4. The insulation layer 43 is disposed on the end surface of the electrode terminal 3 facing the overlapping region 112, which can be that the insulation layer 43 is bonded to the end surface of the electrode terminal 3 facing the overlapping region 112 and covers the overlapping region 112. The insulation layer 43 is disposed on the surface of the overlapping region 112 facing the electrode terminal 3, which can be that the insulation layer 43 is bonded to the surface of the overlapping region 112 facing the electrode terminal 3 and covers the overlapping region 112.

[0166] By connecting the projection of the insulation layer 43 in the thickness direction to the projection of the insulation connector 41 between the electrode terminal 3 and the overlapping region 112 in the thickness direction, and connecting the projection of the insulation layer 43 in the thickness direction to the projection of the insulation seal 42 between the electrode terminal 3 and the overlapping region 112 in the thickness direction, the insulation layer 43 in the thickness direction can completely cover the overlapping region 112 together with the insulation connector 41 and the insulation seal 42, which is beneficial to reduce the possibility of breakdown channel between the electrode terminal 3 and the overlapping region 112.

[0167] In some embodiments, with reference to Figs. 22 and 23, in the thickness direction, the projection of the inner end of the portion of the insulation connector 41 between the electrode terminal 3 and the overlapping region 112 is located within the projection of the insulation layer 43, and the projection of the outer end of the portion of the insulation seal 42 between the electrode terminal 3 and the overlapping region 112 is located within the projection of the insulation layer 43.

[0168] The inner end of the portion of the insulation connecting piece 41 between the electrode terminal 3 and the overlapping area 112 is located within the projection of the insulation layer 43 in the thickness direction of the wall portion 11, so that the insulation layer 43 overlaps the insulation connecting piece 41 in the thickness direction; the outer end of the portion of the insulation sealing piece 42 between the electrode terminal 3 and the overlapping area 112 is located within the projection of the insulation layer 43 in the thickness direction of the wall portion 11, so that the insulation layer 43 overlaps the insulation sealing piece 42 in the thickness direction, so that the insulation layer 43 overlaps both the insulation connecting piece 41 and the insulation sealing piece 42 in the thickness direction of the wall portion 11, so that the insulation layer 43 can better cover the overlapping area 112 together with the insulation connecting piece 41 and the insulation sealing piece 42, which is conducive to further reducing the possibility of a breakdown channel between the electrode terminal 3 and the overlapping area 112.

[0169] In some embodiments, the insulation layer 43 can be a structure formed by curing a liquid insulation material such as insulation glue or insulation paint, or can be a solid insulation material such as an insulation sticker or an insulation tape.

[0170] Some embodiments of the present application also provide a battery 100 comprising the battery cell 20 provided by the technical solutions described above.

[0171] Some embodiments of the present application also provide a power utilization device comprising the battery 100 provided by the technical solutions described above, and the battery 100 is used to provide electric energy.

[0172] Some embodiments of the present application provide a battery cell 20 comprising a housing 1, an electrode assembly 2, an electrode terminal 3, an insulation assembly 4, and a fixing piece 5. The wall portion 11 of the housing 1 is provided with an electrode lead-out hole 111. The electrode assembly 2 is arranged in the housing 1. At least 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 comprises an overlapping area 112 overlapping the electrode terminal 3 in the thickness direction of the wall portion 11. The end surface of the electrode terminal 3 facing the overlapping area 112 is recessed to form a second recess 31. Part of the insulation connecting piece 41 in the insulation assembly 4 is arranged in the second recess 31. Part of the insulation sealing piece 42 is clamped between the end surface and the overlapping area 112 and extends between the bottom surface 311 of the second recess 31 and the overlapping area 112, so that the insulation sealing piece 42 and the insulation connecting piece 41 partially overlap. The insulation assembly 4 can completely cover the overlapping area 112 in the thickness direction, so that a breakdown channel is not easily formed between the electrode terminal 3 and the overlapping area 112, and the electrode terminal 3 is not easily short-circuited with the wall portion 11, which is conducive to improving the reliability of the battery cell 20.

[0173] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a wall portion, wherein the wall portion is provided with electrode lead-out holes; Electrode assembly, disposed within 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 overlap area that overlaps with the electrode terminal in the thickness direction of the wall portion; An insulating component at least partially surrounds and is fixed to the electrode terminal, with a portion of the insulating component located between the electrode terminal and the overlapping area; in the thickness direction of the wall portion, the portion of the insulating component located between the overlapping area and the electrode terminal completely covers the overlapping area; A fastener is fixedly connected to the wall portion and the insulating assembly.

2. The battery cell according to claim 1, wherein, The insulating assembly includes an insulating connector that at least partially surrounds and secures 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. 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 or 2, wherein, The insulating assembly includes an insulating seal and an insulating connector. The insulating connector at least partially surrounds the electrode terminal and secures the electrode terminal and the wall portion. The insulating connector is surrounding the outside of the insulating seal. At least a portion of the insulating seal is sandwiched between the electrode terminal and the overlapping area. The 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 or 3, wherein, The insulating assembly includes an insulating seal and an insulating connector. The insulating connector at least partially surrounds the electrode terminal and secures the electrode terminal and the wall portion. The insulating connector is surrounding the outside of the insulating seal. At least a portion of the insulating seal is sandwiched between the electrode terminal and the overlapping area. 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, wherein, A portion of the insulating connector surrounds the insulating seal and abuts against the outer peripheral surface of the insulating seal.

6. The battery cell according to claim 4 or 5, wherein, In the thickness direction of the wall portion, the portion of the insulating connector located between the electrode terminal and the overlapping area overlaps with the portion of the insulating seal sandwiched between the electrode terminal and the overlapping area.

7. The battery cell according to claim 6, wherein, The insulating connector has a first recess on the side facing the overlapping area, and a portion of the insulating seal is accommodated in the first recess.

8. The battery cell according to any one of claims 4 to 7, wherein, The electrode terminal has an end face facing the overlapping area and a second recess recessed relative to the end face, the second recess surrounding the end face and extending to the outer peripheral surface of the electrode terminal; The insulating seal completely separates the overlapping area from the end face; A portion of the insulating connector is disposed in the second recess, and the bottom surface of the second recess is completely separated from the overlapping area.

9. The battery cell according to claim 8, wherein, 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 face. 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 or 9, wherein, A portion of the insulating seal is located between the bottom surface of the second recess and the overlapping area and overlaps with the insulating connector.

11. The battery cell according to any one of claims 8 to 10, wherein, In the thickness direction of the wall portion, the depth of the second recess is A, where 0.2mm ≤ A ≤ 1mm.

12. The battery cell according to any one of claims 8 to 11, wherein, In the radial direction of the electrode terminal, the dimension of the second recess is B, where 0.2mm ≤ B ≤ 1mm.

13. The battery cell according to any one of claims 2 to 12, wherein, The insulating connector is an injection-molded structure.

14. The battery cell according to any one of claims 4 to 12, wherein, The insulating component further includes an insulating layer 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 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 comprising a battery cell as described in any one of claims 1 to 14.

16. An electrical device comprising the battery of claim 15, the battery being used to provide electrical energy.

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