Battery cell, battery device, electric device and energy storage device

Abstract

Provided in the embodiments of the present disclosure are a battery cell, a battery device, an electric device and an energy storage device. The battery cell comprises a casing, electrode terminals, an electrode assembly, adapters, and insulating members. The electrode terminals are disposed on the casing. The electrode assembly is disposed in the casing and is provided with tabs. The tabs are electrically connected to the electrode terminals by means of the adapters, and each adapter comprises a first connecting portion and a second connecting portion, each first connecting portion being electrically connected to the corresponding electrode terminal, and each second connecting portion being electrically connected to the corresponding tab. At least part of each insulating member is arranged between the corresponding adapter and the casing.

Description

Battery cells, battery packs, electrical devices, and energy storage devices Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery cell, battery device, power supply device, and energy storage device. Background Technology

[0002] This section is intended to provide background or context for embodiments of this disclosure. The description herein is not intended to imply that it is prior art simply because it is included in this section.

[0003] In new energy vehicles equipped with battery devices, the battery devices can provide all or part of the power. The tabs of the battery cells in the battery device are typically connected to the electrode terminals via adapters. In related technologies, there may be insulation failure between the adapter and the casing, leading to a short circuit. Summary of the Invention

[0004] In view of this, the present disclosure aims to provide a battery cell, battery device, power consumption device, and energy storage device that can reduce the possibility of short circuits caused by insulation failure between the adapter and the casing, thereby improving the reliability of the battery cell.

[0005] To achieve the above objectives, a first aspect of this disclosure provides a battery cell, comprising:

[0006] shell;

[0007] Electrode terminals, wherein the electrode terminals are disposed in the housing;

[0008] An electrode assembly, wherein the electrode assembly is disposed within the housing, and the electrode assembly is provided with tabs;

[0009] An adapter is provided, wherein the tab and the electrode terminal are electrically connected via the adapter. The adapter includes a first connecting part and a second connecting part, wherein the first connecting part is electrically connected to the electrode terminal and the second connecting part is electrically connected to the tab.

[0010] An insulating element, at least a portion of which is disposed between the adapter and the housing.

[0011] The battery cell provided in this disclosure includes a casing, electrode terminals, electrode assemblies, an adapter, and an insulating component. The electrode assembly has tabs that allow current to be discharged from the assembly. The casing has at least one electrode terminal, and the electrode terminal is electrically connected to the tabs via the adapter. By configuring the adapter to include a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal and the second connecting portion being electrically connected to the tabs, and by placing the insulating component between the adapter and the casing, the possibility of short circuits due to insulation failure between the adapter and the casing can be reduced to some extent, thereby improving the reliability of the battery cell.

[0012] In some embodiments, at least a portion of the insulating element is attached to the adapter.

[0013] In this embodiment, by attaching at least a portion of the insulating element to the adapter, the bonding ability between the insulating element and the adapter is improved, and the possibility of the adapter directly contacting the electrode plate of the electrode assembly is further reduced.

[0014] In some embodiments, at least a portion of the insulating element is attached to the housing.

[0015] Here, even if a normal battery cell may be affected by the heat of a thermally runaway battery cell, causing damage to the lower plastic between the internal connector and the outer casing, the possibility of insulation failure between the connector and the outer casing is reduced because an additional insulating component is provided on the outer casing, meaning the connector will not directly contact the outer casing.

[0016] In some embodiments, the melting point of the insulating element is T, where T ≥ 150°C.

[0017] In this embodiment, the reliability of the insulating component is improved by setting the melting point of the insulating component to be greater than or equal to 150°C.

[0018] In some embodiments, the energy density of the battery cell is E, and the relationship between E and T satisfies:

[0019] If E < 390 Wh / L, then T ≥ 150 ℃;

[0020] If E≥390Wh / L, then T≥200℃.

[0021] Here, when the energy density of a single battery cell is less than 390Wh / L, setting the melting point of the insulating component to ≥150℃ provides good insulation and meets the requirement of not melting / softening and shrinking under thermal diffusion conditions. When the energy density of a single battery cell is ≥390Wh / L, setting the melting point of the insulating component to ≥200℃ provides good insulation and meets the requirement of not melting / softening and shrinking under thermal diffusion conditions.

[0022] In some embodiments, the insulating element is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide, a polyphthalamide film, or a polyphenylene sulfide film.

[0023] It has high temperature resistance and high insulation.

[0024] In some embodiments, the insulating member includes a first insulating portion and a second insulating portion, the first insulating portion being disposed between the first adapter portion and the housing, and the second insulating portion being disposed between the second adapter portion and the housing.

[0025] In this embodiment, by configuring the insulating member to include a first insulating part and a second insulating part, and disposing the first insulating part between the first adapter part and the outer shell, and the second insulating part between the second adapter part and the outer shell, the adapter part can be covered as much as possible, which further helps to reduce the possibility of insulation failure between the adapter part and the outer shell.

[0026] In some embodiments, the housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces; the second connecting portion has a welding area, which is electrically connected to the tab.

[0027] The distance between the side of the second insulating portion away from the first surface and the first surface is A1, and the distance between the side of the welding area away from the first surface and the first surface is A2, where A1 ≥ A2.

[0028] Here, by ensuring that the distance between the side of the second insulating part away from the first surface and the first surface is greater than or equal to the distance between the side of the welding area away from the first surface and the first surface, i.e., the second insulating part completely covers the welding area, it is beneficial to reduce the possibility of insulation failure between the adapter and the housing.

[0029] In some embodiments, the second connection portion has a welding area that is electrically connected to the tab, and the second insulating portion covers the welding area.

[0030] In some embodiments, the housing includes a plurality of surfaces, the plurality of surfaces including a first surface, the first surface being the surface with the largest area among the plurality of surfaces; the distance between the side of the first insulating portion away from the first surface and the first surface is B, 5mm≤B≤50mm.

[0031] In this embodiment, by setting the distance between the side of the first insulating part away from the first surface and the first surface to 5mm-50mm, the space occupied by the insulating part can be reduced as much as possible, while also increasing the coverage area of ​​the first insulating part on the adapter.

[0032] In some embodiments, 10mm ≤ B ≤ 35mm.

[0033] In this embodiment, by setting the distance between the side of the first insulating part away from the first surface and the first surface to 10mm-35mm, the distance within this range is appropriate. This not only minimizes the space occupied by the insulating part, but also helps to further increase the coverage area of ​​the first insulating part on the adapter.

[0034] In some embodiments, the distance between the side of the first insulating portion near the first surface and the first surface is less than or equal to the distance between the side of the adapter near the first surface and the first surface.

[0035] In other words, the first insulating part can cover the side of the adapter near the first surface, thereby reducing the possibility of insulation failure between the adapter and the housing.

[0036] In some embodiments, the housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces, and the first surface is distributed on both sides of the battery cell along the thickness direction; the distance between the first insulating portion and the second insulating portion in a first direction is C, where C≤5mm, wherein the first direction intersects the thickness direction of the battery cell.

[0037] In this embodiment, by setting the distance between the first insulating part and the second insulating part in the first direction to be less than or equal to 5 mm, the appropriate distance within this range not only minimizes the space occupied by the insulating part and improves assembly efficiency, but also helps to increase the coverage area of ​​the insulating part on the adapter.

[0038] In some embodiments, the housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces, and the first surface is distributed on both sides of the battery cell along the thickness direction; the battery cell also includes second surfaces on both sides along a first direction, and the distance between the side of the insulating member near the second surface and the second surface is less than or equal to the distance between the side of the adapter member near the second surface and the second surface; wherein, the first direction intersects the thickness direction of the battery cell.

[0039] In this embodiment, the insulating element can cover the side of the adapter near the second surface, thereby reducing the possibility of insulation failure between the adapter and the housing.

[0040] In some embodiments, the thickness of the insulating element is D, where 20 μm ≤ D ≤ 200 μm.

[0041] In this embodiment, by setting the thickness of the insulating component to 20μm-200μm, the appropriate thickness within this range can minimize the space occupied by the insulating component, thereby reducing its impact on the gap between the outer shell and the adapter. At the same time, it can also give the insulating component certain mechanical properties such as strength, which helps to reduce the possibility of the insulating component being punctured and also helps to improve the situation of shrinkage and deformation of the insulating component.

[0042] In some embodiments, the housing includes an end cap and a shell, the shell having an opening, and the end cap covering the opening; at least a portion of the insulating element is disposed between the adapter and the end cap.

[0043] Here, even if a normal battery cell may be affected by the heat of a thermally runaway battery cell, causing insulation failure between the internal adapter and the end cap (e.g., damage to the lower plastic), the possibility of insulation failure between the adapter and the end cap is reduced because an additional insulating component is provided between the adapter and the end cap, meaning the adapter will not directly contact the end cap.

[0044] In some embodiments, the insulating member includes a third insulating portion and a fourth insulating portion, the third insulating portion and the fourth insulating portion being connected, the third insulating portion being disposed between the adapter and the end cap, and the fourth insulating portion being disposed between the electrode assembly and the housing.

[0045] In this embodiment, by configuring the insulating member to include a third insulating part and a fourth insulating part, and disposing the third insulating part between the adapter and the end cap, and the fourth insulating part between the electrode assembly and the housing, the adapter can be covered by the third insulating part, reducing the possibility of insulation failure between the adapter and the end cap, and the electrode assembly can be covered by the fourth insulating part, reducing the possibility of insulation failure between the electrode assembly and the housing.

[0046] In some embodiments, the housing includes a plurality of surfaces, the plurality of surfaces including a first surface, the first surface being the surface with the largest area among the plurality of surfaces, and the fourth insulating portion is disposed between the electrode assembly and the housing.

[0047] It is understandable that the arrangement direction of the battery cells is generally perpendicular to the first surface. After the battery cells run away from thermal control, they generate heat, which has a significant thermal impact on the large surface of the adjacent battery cells. Therefore, the fourth insulating part is preferentially disposed between the electrode assembly and the first surface.

[0048] In some embodiments, the battery cell includes a lower plastic layer disposed between the housing and the electrode assembly, and at least a portion of the insulating element is attached to the lower plastic layer.

[0049] Here, even if a normal battery cell may be affected by the heat of a thermally runaway battery cell, causing damage to the lower plastic between the internal connector and the outer casing, the presence of an additional insulating component on the lower plastic prevents the connector from directly contacting the outer casing, thus reducing the likelihood of insulation failure between the connector and the outer casing.

[0050] In some embodiments, the battery cell includes a lower plastic layer disposed between the housing and the electrode assembly. The lower plastic layer has a groove formed on the side facing the electrode assembly. The second connecting portion is bent relative to the first connecting portion toward the top of the battery cell and extends into the groove.

[0051] In this embodiment, a groove is provided on the side of the lower plastic facing the electrode assembly. The second connecting part is bent relative to the first connecting part toward the top of the battery cell and extends into the groove. The groove provides a space for the second connecting part, which is beneficial to improving space utilization and structural compactness.

[0052] In some embodiments, at least a portion of the sidewall of the lower plastic away from the electrode assembly protrudes, so that the lower plastic is recessed to form the groove on the sidewall closer to the electrode assembly; or, at least a portion of the sidewall of the lower plastic closer to the electrode assembly is thinned to form the groove.

[0053] For example, by stamping, at least a portion of the sidewall of the lower plastic on the side away from the electrode assembly protrudes, so that the sidewall of the lower plastic corresponding to the side near the electrode assembly is recessed to form a groove.

[0054] For example, milling, planing and other processing techniques can be used to thin at least part of the sidewall of the lower plastic near the electrode assembly to form a groove. The groove formed by this processing method has high precision and is easy to form.

[0055] In some embodiments, the first insulating part and the second insulating part are an integral structure.

[0056] In this embodiment, by setting the first insulating part and the second insulating part as an integral structure, it is beneficial to reduce the number of parts and improve assembly efficiency.

[0057] In some embodiments, both the first insulating portion and the second insulating portion are rectangular.

[0058] This helps to improve the molding efficiency of the first and second insulating parts.

[0059] A second aspect of this disclosure provides a battery device including at least one of the battery cells described above.

[0060] The battery cell of the battery device provided in this disclosure includes a casing, electrode terminals, electrode assemblies, an adapter, and an insulating component. The electrode assembly has tabs that allow current to be discharged from the assembly. The casing has at least one electrode terminal, and the electrode terminal is electrically connected to the tabs via the adapter. By configuring the adapter to include a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal and the second connecting portion being electrically connected to the tabs, and by placing the insulating component between the adapter and the casing, the possibility of short circuits due to insulation failure between the adapter and the casing can be reduced to a certain extent, thereby improving the reliability of the battery cell.

[0061] A third aspect of this disclosure provides an electrical device including a battery cell or a battery device as described above, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0062] The battery device of the power device provided in this disclosure includes a battery cell, comprising a casing, electrode terminals, electrode assemblies, an adapter, and an insulating component. The electrode assembly has tabs that allow current to be discharged from the electrode assembly. The casing has at least one electrode terminal, and the electrode terminal is electrically connected to the tabs via the adapter. By configuring the adapter to include a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal and the second connecting portion being electrically connected to the tabs, and by placing the insulating component between the adapter and the casing, the possibility of short circuits due to insulation failure between the adapter and the casing can be reduced to a certain extent, thereby improving the reliability of the battery cell.

[0063] A fourth aspect of this disclosure provides an energy storage device, including the battery cell or battery device described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0064] The energy storage device provided in this disclosure includes a battery cell, comprising a casing, electrode terminals, electrode assemblies, an adapter, and an insulating component. The electrode assembly has tabs that allow current to be discharged from the assembly. The casing has at least one electrode terminal, which is electrically connected to the tabs via the adapter. By configuring the adapter to include a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal and the second connecting portion being electrically connected to the tabs, and by placing the insulating component between the adapter and the casing, the possibility of short circuits due to insulation failure between the adapter and the casing can be reduced to some extent, thereby improving the reliability of the battery cell. Attached Figure Description

[0065] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this disclosure;

[0066] Figure 2 is an exploded view of a battery device provided in an embodiment of this disclosure;

[0067] Figure 3 is a schematic diagram of the structure of a single battery cell provided in the first embodiment of this disclosure;

[0068] Figure 4 is an exploded view of Figure 3;

[0069] Figure 5 is a top view of Figure 3;

[0070] Figure 6 is a cross-sectional view along the aa direction in Figure 5;

[0071] Figure 7 is an enlarged view of point b in Figure 6;

[0072] Figure 8 is a cross-sectional view along the cc direction in Figure 5;

[0073] Figure 9 is an enlarged view of point d in Figure 8;

[0074] Figure 10 is a cross-sectional view along the ee direction in Figure 5;

[0075] Figure 11 is an enlarged view of point m in Figure 10;

[0076] Figure 12 is an enlarged view of point n in Figure 10;

[0077] Figure 13 is a schematic diagram of the structure of a battery cell provided in the second embodiment of this disclosure;

[0078] Figure 14 is a schematic diagram of the structure of a battery cell provided in the third embodiment of this disclosure;

[0079] Figure 15 is a schematic diagram of the structure of a battery cell provided in the fourth embodiment of this disclosure.

[0080] Explanation of reference numerals in the attached drawings: 10. Battery cell; 11. Adapter; 111. First connecting part; 112. Second connecting part; 113. Welding area; 12. Outer shell; 121. Housing; 122. End cap; 13. Electrode terminal; 14. Electrode assembly; 141. Tab; 15. Insulator; 151. First insulating part; 152. Second insulating part; 153. Third insulating part; 154. Fourth insulating part; 16. Lower plastic; 17. First surface; 18. Second surface; 21. Housing; 211. First housing; 212. Second housing; 100. Battery assembly; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0081] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0082] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0083] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0084] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0085] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0086] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0089] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this disclosure is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate 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 Co1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0091] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0092] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] 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 disclosure is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0097] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0098] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0099] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0100] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0101] In some embodiments, the separator is a separator membrane. This disclosure 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.

[0102] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure 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.

[0105] Liquid electrolytes include electrolyte salts and solvents.

[0106] 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.

[0107] 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.

[0108] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0109] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0110] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0111] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0112] 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-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0113] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0114] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0115] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0116] In some implementations, the electrode assembly is a stacked structure.

[0117] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0118] 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.

[0119] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0120] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0121] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0122] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0123] 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.

[0124] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0125] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0126] In new energy vehicles equipped with battery devices, the battery devices can provide all or part of the power. The tabs of the battery cells in the battery device are usually connected to the electrode terminals via adapters. In related technologies, during use, a normal battery cell may be affected by the heat of a thermally runaway battery cell, causing the internal insulation of the normal battery cell to fail, resulting in a short circuit between the adapter and the casing.

[0127] In view of this, in order to reduce the possibility of short circuits caused by insulation failure between the adapter and the casing, and to improve the reliability of the battery cell, this disclosure provides a battery cell. The battery cell includes a casing, electrode terminals, an electrode assembly, an adapter, and an insulating component. The electrode terminals are disposed in the casing. The electrode assembly is disposed within the casing and has tabs. The tabs and electrode terminals are electrically connected via the adapter, which includes a first connecting portion and a second connecting portion. The first connecting portion is electrically connected to the electrode terminals, and the second connecting portion is electrically connected to the tabs. The insulating component is disposed between the adapter and the casing.

[0128] The battery cell provided in this disclosure includes a casing, electrode terminals, electrode assemblies, an adapter, and an insulating component. The electrode assembly has tabs that allow current to be discharged from the assembly. The casing has at least one electrode terminal, and the electrode terminal is electrically connected to the tabs via the adapter. By configuring the adapter to include a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal and the second connecting portion being electrically connected to the tabs, and by placing the insulating component between the adapter and the casing, the possibility of short circuits due to insulation failure between the adapter and the casing can be reduced to some extent, thereby improving the reliability of the battery cell.

[0129] The technical solutions described in the embodiments of this disclosure are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0130] Referring to Figure 1, a controller 200, a motor 300, and a battery device 100 can be installed inside the vehicle 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this disclosure, the battery device 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.

[0131] This disclosure provides an energy storage device, including a plurality of battery cells 10 or battery devices 100 according to any embodiment of this disclosure, wherein the battery cells 10 or battery devices 100 are used to store or provide electrical energy.

[0132] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this disclosure can be any power system that requires energy storage devices.

[0133] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0134] Referring to Figures 3 to 15, this disclosure provides a battery cell 10. The battery cell 10 includes a housing 12, electrode terminals 13, electrode assemblies 14, an adapter 11, and an insulating member 15. The electrode terminals 13 are disposed within the housing 12. The electrode assembly 14 is disposed within the housing 12 and has tabs 141. The tabs 141 and electrode terminals 13 are electrically connected via the adapter 11. The adapter 11 includes a first connecting portion 111 and a second connecting portion 112. The first connecting portion 111 is electrically connected to the electrode terminals 13, and the second connecting portion 112 is electrically connected to the tabs 141. At least a portion of the insulating member 15 is disposed between the adapter 11 and the housing 12.

[0135] In some embodiments, referring to Figures 3 and 4, the housing 12 includes an end cap 122 and a housing 121. The housing 121 has an opening, and the end cap 122 covers the opening. The housing 121 may have one or more openings. The end cap 122 may also have one or more.

[0136] In some embodiments, at least one electrode terminal 13 is provided on the housing 12, and the electrode terminal 13 is electrically connected to the tab 141 via an adapter 11. The electrode terminal 13 may be provided on the end cap 122 or on the housing 121.

[0137] Referring to Figure 2, the battery device 100 mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via busbars.

[0138] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10.

[0139] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0140] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 21 and one or more individual battery cells housed within the housing 21.

[0141] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 21 by fixing the battery module in the housing 21.

[0142] As an example, the battery cell assembly can also be housed in the housing 21 by directly fixing multiple battery cells 10 to the housing 21.

[0143] As an example, referring to Figure 2, the housing 21 may include a first housing 21121 and a second housing 21221. The first housing 21121 and the second housing 21221 are fastened together, forming a closed space inside the housing 21 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 21121 may be a top cover or a bottom plate.

[0144] As an example, the housing 21 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 21 forms an enclosed space to accommodate the battery cell assembly.

[0145] In some embodiments, the housing 21 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 21 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 21 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0146] As an example, please refer to Figure 4. The battery cell 10 includes a lower plastic 16, which is disposed inside the housing 12 and located between the electrode terminal 13 and the housing 12 to achieve insulation between the electrode terminal 13 and the housing 12. In addition, the lower plastic 16 is also located between the electrode terminal 13 and the adapter 11 to achieve insulation between the electrode terminal 13 and the adapter 11.

[0147] As an example, the first connecting part 111 and the second connecting part 112 can be an integral structure or a separate structure.

[0148] At least a portion of the insulating element 15 is disposed between the adapter 11 and the housing 12. In other words, by providing an additional insulating element 15 between the adapter 11 and the housing 12, the possibility of short circuit due to insulation failure between the adapter 11 and the housing 12 can be reduced to a certain extent, thereby improving the reliability of the battery cell 10.

[0149] Here, even if the normal battery cell 10 may be affected by the heat of the thermal runaway battery cell 10, causing the insulation between the internal adapter 11 and the outer casing 12 of the normal battery cell 10 to fail (for example, the lower plastic 16 is damaged), the possibility of insulation failure between the adapter 11 and the outer casing 12 is reduced because an additional insulating component 15 is provided between the adapter 11 and the outer casing 12, that is, the adapter 11 will not directly contact the outer casing 12.

[0150] The statement that "at least some of the insulating components 15 are disposed between the adapter 11 and the housing 12" means that all of the insulating components 15 can be disposed between the adapter 11 and the housing 12, or only some of the insulating components 15 can be disposed between the adapter 11 and the housing 12.

[0151] The battery cell 10 provided in this embodiment includes a housing 12, electrode terminals 13, electrode assemblies 14, an adapter 11, and an insulator 15. The electrode assembly 14 has tabs 141 that allow current to be drawn out. At least one electrode terminal 13 is provided on the housing 12, and the electrode terminal 13 is electrically connected to the tabs 141 via the adapter 11. By configuring the adapter 11 to include a first connecting portion 111 and a second connecting portion 112, where the first connecting portion 111 is electrically connected to the electrode terminal 13 and the second connecting portion 112 is electrically connected to the tabs 141, and by placing the insulator 15 between the adapter 11 and the housing 12, the possibility of short circuits due to insulation failure between the adapter 11 and the housing 12 can be reduced to a certain extent, thereby improving the reliability of the battery cell 10.

[0152] There are several ways in which the insulating element 15 is disposed between the adapter 11 and the housing 12.

[0153] In some embodiments, as shown in Figures 6 and 7, at least a portion of the insulating element 15 is attached to the adapter 11.

[0154] Here, all of the insulating parts 15 can be attached to the adapter 11, or only some of the insulating parts 15 can be attached to the adapter 11.

[0155] For example, the insulating element 15 is attached to the adapter 11 by adhesive.

[0156] In this embodiment, by attaching at least a portion of the insulating element 15 to the adapter 11, it is beneficial to improve the bonding ability between the insulating element 15 and the adapter 11, and further beneficial to reduce the possibility of the adapter 11 directly contacting the electrode sheet of the electrode assembly 14.

[0157] In other embodiments, at least a portion of the insulating element 15 is attached to the housing 12.

[0158] Here, even if the normal battery cell 10 may be affected by the heat of the thermal runaway battery cell 10, causing the lower plastic 16 between the internal adapter 11 and the outer casing 12 of the normal battery cell 10 to be damaged, the possibility of insulation failure between the adapter 11 and the outer casing 12 is reduced because an additional insulating part 15 is provided on the outer casing 12, that is, the adapter 11 will not directly contact the outer casing 12.

[0159] In some other embodiments, at least a portion of the insulating element 15 is attached to the lower plastic 16.

[0160] Here, even if the normal battery cell 10 may be affected by the heat of the thermal runaway battery cell 10, causing the lower plastic 16 between the internal adapter 11 and the outer casing 12 of the normal battery cell 10 to be damaged, the possibility of insulation failure between the adapter 11 and the outer casing 12 is reduced because an additional insulating part 15 is provided on the lower plastic 16, that is, the adapter 11 will not directly contact the outer casing 12.

[0161] In some embodiments, the melting point of the insulating element 15 is T, where T ≥ 150°C.

[0162] Understandably, in order to reduce the possibility of the insulation component 15 failing due to melting or shrinkage caused by heat during normal use, the melting point of the insulation component 15 needs to be sufficiently high.

[0163] In this embodiment, the reliability of the insulating component 15 is improved by setting the melting point of the insulating component 15 to be greater than or equal to 150°C.

[0164] In some embodiments, the energy density of the battery cell 10 is E, and the relationship between E and T satisfies:

[0165] If E < 390 Wh / L, then T ≥ 150 ℃;

[0166] If E≥390Wh / L, then T≥200℃.

[0167] Here, the higher the energy density of the battery cell 10, the more heat is generated after the battery cell 10 thermal runaway. After the battery cell 10 thermal runaway, the temperature of the large area rises, which aggravates the thermal impact on adjacent battery cells 10. Therefore, it is necessary to have a higher temperature-resistant insulation component 15 that does not melt / soften and shrink under thermal diffusion scenarios.

[0168] In other words, as the energy density of the battery cell 10 increases, the melting point of the insulating component 15 also increases.

[0169] Here, when the energy density of the battery cell 10 is less than 390Wh / L, the melting point of the insulating component 15 is set to be greater than or equal to 150℃, which can achieve a good insulation effect and meet the requirements of not melting / softening and shrinking under thermal diffusion scenarios. When the energy density of the battery cell 10 is greater than or equal to 390Wh / L, the melting point of the insulating component 15 is set to be greater than or equal to 200℃, which can achieve a good insulation effect and meet the requirements of not melting / softening and shrinking under thermal diffusion scenarios.

[0170] It should be noted that the specific type of insulating component 15 is not limited here.

[0171] For example, the insulating element 15 is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide (commonly known as a nylon film), a polyphthalamide film, or a polyphenylene sulfide film.

[0172] Polyimide (PI) film, polyethylene terephthalate (PET) film, polypropylene (PP) film, polyethylene (PE) film, polyamide (PA) film, polyphthalamide (PPA) film, and polyphenylene sulfide (PPS) film all have high temperature resistance and high insulation properties.

[0173] Of course, the insulating element 15 can also be other films with high temperature resistance and high insulation.

[0174] For example, the thickness of the insulating element 15 is D, where 20 μm ≤ D ≤ 200 μm.

[0175] For example, the thickness of the insulating element 15 can be any one of 20μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, and 200μm, or any value between two of them.

[0176] It is understandable that the smaller the thickness of the insulating component 15, the smaller the impact on the gap between the outer shell 12 and the adapter 11; the larger the thickness of the insulating component 15, the better the mechanical properties of the insulating component 15, such as strength, which is beneficial to reducing the possibility of the insulating component 15 being punctured and also beneficial to improving the shrinkage and deformation of the insulating component 15.

[0177] In this embodiment, by setting the thickness of the insulating component 15 to 20μm-200μm, the thickness within this range is appropriate. This allows the insulating component 15 to occupy as little space as possible, thereby reducing the impact on the gap between the outer shell 12 and the adapter 11. At the same time, it also allows the insulating component 15 to have certain mechanical properties such as strength, which helps to reduce the possibility of the insulating component 15 being punctured and also helps to improve the shrinkage and deformation of the insulating component 15.

[0178] In some embodiments, referring to FIG4, the insulating member 15 includes a first insulating portion 151 and a second insulating portion 152. The first insulating portion 151 is disposed between the first transition portion and the housing 12, and the second insulating portion 152 is disposed between the second transition portion and the housing 12.

[0179] In this embodiment, by configuring the insulating member 15 to include a first insulating part 151 and a second insulating part 152, and by disposing the first insulating part 151 between the first adapter and the outer shell 12, and the second insulating part 152 between the second adapter and the outer shell 12, the adapter 11 can be covered as much as possible, which further helps to reduce the possibility of insulation failure between the adapter 11 and the outer shell 12.

[0180] For example, referring to FIG15, in the height direction of the battery cell 10, the second connection portion 112 is higher than the first connection portion 111.

[0181] Here, the second connecting portion 112 is higher than the first connecting portion 111, meaning that the second connecting portion 112 and the first connecting portion 111 are not on the same plane; that is, the distance between the second connecting portion 112 and the bottom end of the outer casing 12 is greater than the distance between the first connecting portion 111 and the bottom end of the outer casing 12. Since the tab 141 protrudes from other areas of the electrode assembly 14, setting the second connecting portion 112 higher than the first connecting portion 111 helps to reserve space for the tab 141, thereby improving space utilization and structural compactness.

[0182] This facilitates the electrical connection of the first connecting part 111 to the electrode terminal 13 and the electrical connection of the second connecting part 112 to the tab 141, thereby making full use of the space inside the casing 12 and increasing the energy density of the battery cell 10.

[0183] In some embodiments, as shown in Figures 13 and 14, the first insulating portion 151 and the second insulating portion 152 are integral structures.

[0184] In this embodiment, by setting the first insulating part 151 and the second insulating part 152 as an integral structure, it is beneficial to reduce the number of parts and improve assembly efficiency.

[0185] Of course, in other embodiments, the first insulating part 151 and the second insulating part 152 can also be a separate structure, that is, the first insulating part 151 and the second insulating part 152 can be formed separately. This is beneficial to form the first insulating part 151 and the second insulating part 152 into the required shape. For example, the first insulating part 151 and the second insulating part 152 can both be formed into rectangles.

[0186] For example, both the first insulating portion 151 and the second insulating portion 152 are rectangular.

[0187] This helps to improve the molding efficiency of the first insulating part 151 and the second insulating part 152.

[0188] In some embodiments, referring to Figures 4 to 7, the housing 12 includes multiple surfaces, including a first surface 17, which is the surface with the largest area among the multiple surfaces. The second connecting portion 112 has a welding area 113, which is electrically connected to the tab 141. The distance between the side of the second insulating portion 152 away from the first surface 17 and the first surface 17 is A1, and the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17 is A2, where A1 ≥ A2.

[0189] In other words, the distance between the side of the second insulating portion 152 away from the first surface 17 and the first surface 17 is greater than or equal to the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17.

[0190] In other words, the second insulation part 152 covers the welding area 113.

[0191] It should be noted that the first surface 17 described in this embodiment is the large surface of the battery cell 10, which is the surface with the largest area among the multiple surfaces of the battery cell 10.

[0192] Taking a square battery cell 10 as an example, in a vertical state, the surface formed by the length and width directions of the battery cell 10 is the bottom surface of the battery cell 10, the surface formed by the length and height directions of the battery cell 10 is the large surface of the battery cell 10, and the surface formed by the width and height directions of the battery cell 10 is the side surface of the battery cell 10.

[0193] The second connecting part 112 is connected to the electrode tab 141 by welding, and the welding area between the second connecting part 112 and the electrode tab 141 is the welding area 113.

[0194] In multiple embodiments of the electrode assembly 14, the second insulating portion 152 referred to herein refers to the second insulating portion 152 corresponding to and connected to the electrode assembly 14, and the first surface 17 referred to herein refers to the first surface 17 close to the electrode assembly 14.

[0195] Here, by ensuring that the distance between the side of the second insulating portion 152 away from the first surface 17 and the first surface 17 is greater than or equal to the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17, i.e., the second insulating portion 152 completely covers the welding area 113, it is beneficial to reduce the possibility of insulation failure between the adapter 11 and the housing 12.

[0196] In some embodiments, referring to Figures 8 and 9, the housing 12 includes a plurality of surfaces, including a first surface 17, which is the surface with the largest area among the plurality of surfaces. The distance between the side of the first insulating portion 151 away from the first surface 17 and the first surface 17 is B, where 5mm ≤ B ≤ 50mm.

[0197] For example, the distance between the side of the first insulating portion 151 away from the first surface 17 and the first surface 17 can be any one of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 25mm, 28mm, 30mm, 32mm, 35mm, 37mm, 40mm, 43mm, 45mm, 50mm or any combination thereof.

[0198] It is understandable that the smaller the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17, the smaller the space occupied, which is beneficial to improving the structural compactness; the larger the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17, the larger the coverage area of ​​the first insulating part 151 on the adapter 11.

[0199] In this embodiment, by setting the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17 to 5mm-50mm, the space occupied by the insulating part 15 is reduced as much as possible, while also increasing the coverage area of ​​the first insulating part 151 on the adapter 11.

[0200] In some embodiments, please continue to refer to Figures 8 and 9, where 10mm ≤ B ≤ 35mm.

[0201] For example, the distance between the side of the first insulating portion 151 away from the first surface 17 and the first surface 17 can be any one of 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, and 35mm, or any value between two of them.

[0202] In this embodiment, by setting the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17 to 10mm-35mm, the distance within this range is appropriate. This not only minimizes the space occupied by the insulating part 15, but also helps to further increase the coverage area of ​​the first insulating part 151 on the adapter 11.

[0203] In some embodiments, referring to Figures 8 and 9, the distance between the side of the first insulating portion 151 near the first surface 17 and the first surface 17 is less than or equal to the distance between the side of the adapter 11 near the first surface 17 and the first surface 17.

[0204] In other words, the first insulating part 151 can cover the side of the adapter 11 near the first surface 17, thereby helping to reduce the possibility of insulation failure between the adapter 11 and the housing 12.

[0205] In some embodiments, referring to Figures 10 and 11, the first surface 17 is distributed on both sides of the battery cell 10 along the thickness direction. The distance between the first insulating portion 151 and the second insulating portion 152 in the first direction is C, where C ≤ 5 mm, and the first direction intersects the thickness direction of the battery cell 10.

[0206] That is, the distance between the first insulating part 151 and the second insulating part 152 in the first direction is less than or equal to 5 mm.

[0207] Here, the first direction is, for example, the length direction of the battery cell 10.

[0208] The distance between the first insulating part 151 and the second insulating part 152 in the first direction is the distance between the first insulating part 151 and the second insulating part 152 in the length direction.

[0209] For example, the distance between the first insulating part 151 and the second insulating part 152 in the first direction can be a point value of any one of 0, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm, or a point value between any two.

[0210] In an embodiment where the distance between the first insulating portion 151 and the second insulating portion 152 in the first direction is 0, the first insulating portion 151 and the second insulating portion 152 may be connected or intersecting in the first direction.

[0211] It is understandable that the smaller the distance between the first insulating part 151 and the second insulating part 152 in the first direction, the larger the coverage area of ​​the insulating member 15; the larger the distance between the first insulating part 151 and the second insulating part 152 in the first direction, the more beneficial it is to the assembly between the first insulating part 151 and the second insulating part 152.

[0212] In this embodiment, by setting the distance between the first insulating part 151 and the second insulating part 152 in the first direction to be less than or equal to 5 mm, the appropriate distance within this range not only minimizes the space occupied by the insulating part 15 and improves the assembly efficiency, but also helps to increase the coverage area of ​​the insulating part 15 on the adapter 11.

[0213] In some embodiments, referring to Figures 10 to 12, the battery cell 10 further includes second surfaces 18 on both sides along a first direction, and the distance between the side of the insulating member 15 near the second surface 18 and the second surface 18 is less than or equal to the distance between the side of the adapter 11 near the second surface 18 and the second surface 18. The first direction intersects the thickness direction of the battery cell 10.

[0214] In other words, the insulating element 15 can cover the side of the adapter 11 near the second surface 18.

[0215] It should be noted that the second surface 18 described in this embodiment is the side surface of the battery cell 10.

[0216] Taking a square battery cell 10 as an example, in the vertical state, the surface formed by the length and width directions of the battery cell 10 is the bottom surface of the battery cell 10, the surface formed by the length and height directions of the battery cell 10 is the large surface of the battery cell 10, and the surface formed by the width and height directions of the battery cell 10 is the second surface 18 of the battery cell 10.

[0217] In this embodiment, the insulating member 15 can cover the side of the adapter 11 near the second surface 18, thereby helping to reduce the possibility of insulation failure between the adapter 11 and the housing 12.

[0218] In some embodiments, referring to FIG4, the housing 12 includes an end cap 122 and a housing 121, the housing 121 having an opening, and the end cap 122 covering the opening. At least a portion of the insulating member 15 is disposed between the adapter 11 and the end cap 122.

[0219] The statement that at least part of the insulating element 15 is disposed between the adapter 11 and the end cap 122 means that the insulating element 15 can be disposed on the adapter 11, on the end cap 122, or on the lower plastic 16 between the adapter 11 and the end cap 122.

[0220] In other words, by providing an additional insulating element 15 between the adapter 11 and the end cap 122, the possibility of short circuit due to insulation failure between the adapter 11 and the end cap 122 can be reduced to a certain extent, thereby improving the reliability of the battery cell 10.

[0221] Here, even if the normal battery cell 10 may be affected by the heat of the thermal runaway battery cell 10, causing the insulation between the internal adapter 11 and the end cap 122 of the normal battery cell 10 to fail (for example, the lower plastic 16 is damaged), the possibility of insulation failure between the adapter 11 and the end cap 122 is reduced because an additional insulating component 15 is provided between the adapter 11 and the end cap 122, that is, the adapter 11 will not directly contact the end cap 122.

[0222] In some embodiments, referring to Figures 4 to 7, the insulating member 15 includes a third insulating portion 153 and a fourth insulating portion 154, which are connected. The third insulating portion 153 is disposed between the adapter 11 and the end cap 122, and the fourth insulating portion 154 is disposed between the electrode assembly 14 and the housing 121.

[0223] That is, the third insulating part 153 is disposed between the adapter 11 and the end cap 122, one end of the fourth insulating part 154 is connected to the third insulating part 153, and the other end extends to the bottom of the battery cell 10.

[0224] For example, the first insulating portion 151 includes a third insulating portion 153 and a fourth insulating portion 154.

[0225] For example, the second insulating portion 152 includes a third insulating portion 153 and a fourth insulating portion 154.

[0226] It is understandable that the heat generated after the thermal runaway of the battery cell 10 has a thermal effect on the adjacent battery cells 10. As a result, the electrode assembly 14 of the adjacent battery cell 10 is heated, causing damage to the insulation layer on the outer surface. Therefore, by covering the electrode assembly 14 with the insulating component 15, the possibility of short circuit caused by insulation failure between the electrode assembly 14 and the housing 121 can be reduced.

[0227] In this embodiment, by configuring the insulating member 15 to include a third insulating portion 153 and a fourth insulating portion 154, with the third insulating portion 153 disposed between the adapter 11 and the end cap 122, and the fourth insulating portion 154 disposed between the electrode assembly 14 and the housing 121, the adapter 11 can be covered by the third insulating portion 153, reducing the possibility of insulation failure between the adapter 11 and the end cap 122, and the electrode assembly 14 can be covered by the fourth insulating portion 154, reducing the possibility of insulation failure between the electrode assembly 14 and the housing 121.

[0228] In some embodiments, please refer to Figures 13 to 15, the housing 12 includes a plurality of surfaces, including a first surface 17, which is the surface with the largest area among the plurality of surfaces, and a fourth insulating portion 154 is disposed between the electrode assembly 14 and the housing 121.

[0229] It is understandable that the arrangement direction of the battery cells 10 is generally perpendicular to the first surface 17. After the battery cells 10 undergo thermal runaway, they generate heat, which has a significant thermal impact on the large surface of the adjacent battery cells 10. Therefore, the fourth insulating part 154 is preferably disposed between the electrode assembly 14 and the first surface 17.

[0230] For example, referring to FIG15, the battery cell 10 includes a lower plastic 16 disposed between the housing 12 and the electrode assembly 14. The side of the lower plastic 16 facing the electrode assembly 14 forms a groove. The second connecting portion 112 bends relative to the first connecting portion 111 toward the top of the battery cell 10 and extends into the groove.

[0231] In this embodiment, a groove is provided on the side of the lower plastic 16 facing the electrode assembly 14. The second connecting part 112 bends relative to the first connecting part 111 toward the top of the battery cell 10 and extends into the groove. The groove provides a space for the second connecting part 112, which is beneficial to improving space utilization and structural compactness.

[0232] It should be noted that there are multiple ways to form grooves.

[0233] For example, referring to FIG15, at least a portion of the sidewall of the end cap 122 on the side away from the lower plastic 16 protrudes, so that the sidewall of the lower plastic 16 corresponding to the protruding area on the lower plastic 16 is recessed to form a recessed area.

[0234] In some embodiments, referring to FIG15, at least a portion of the sidewall of the lower plastic 16 on the side away from the electrode assembly 14 protrudes, so that the lower plastic 16 forms a groove corresponding to the sidewall of the lower plastic 16 closer to the electrode assembly 14.

[0235] In this embodiment, the thickness of the groove wall is equal to the wall thickness of the lower plastic 16.

[0236] For example, by stamping, at least a portion of the sidewall of the lower plastic 16 on the side away from the electrode assembly 14 protrudes, so that the lower plastic 16 is recessed on the sidewall closer to the electrode assembly 14 to form a groove.

[0237] It should be noted that there are no restrictions on the cross-sectional shape of the groove.

[0238] Here, the groove can be selected with different cross-sectional shapes according to requirements.

[0239] For example, at least a portion of the sidewall of the end cap 122 on the side away from the lower plastic 16 protrudes, such that the sidewall of the lower plastic 16 corresponding to the protruding area on the lower plastic 16 is recessed to form a recessed area.

[0240] In other embodiments, at least a portion of the sidewall of the lower plastic 16 near the electrode assembly 14 is thinned to form a groove.

[0241] In this embodiment, at least a portion of the sidewall of the lower plastic 16 near the electrode assembly 14 is thinned to form a groove, that is, the thickness of the groove wall is less than the wall thickness of other areas of the lower plastic 16.

[0242] For example, milling, planing and other processing techniques can be used to thin at least part of the sidewall of the lower plastic 16 near the electrode assembly 14 to form a groove. The groove formed by this processing method has high precision and is easy to form.

[0243] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A single battery cell, comprising: shell; Electrode terminals, wherein the electrode terminals are disposed in the housing; An electrode assembly, wherein the electrode assembly is disposed within the housing, and the electrode assembly is provided with tabs; An adapter is provided, wherein the tab and the electrode terminal are electrically connected via the adapter. The adapter includes a first connecting part and a second connecting part, wherein the first connecting part is electrically connected to the electrode terminal and the second connecting part is electrically connected to the tab. An insulating element, at least a portion of which is disposed between the adapter and the housing.

2. The battery cell according to claim 1, wherein, At least a portion of the insulating element is attached to the adapter.

3. The battery cell according to any one of claims 1-2, wherein, At least a portion of the insulating element is attached to the housing.

4. The battery cell according to any one of claims 1-3, wherein, The melting point of the insulating component is T, where T ≥ 150℃.

5. The battery cell according to claim 4, wherein, The energy density of the battery cell is E, and the relationship between E and T satisfies the following: If E < 390 Wh / L, then T ≥ 150 ℃; If E ≥ 390 Wh / L, then T ≥ 200 ℃.

6. The battery cell according to any one of claims 1-5, wherein, The insulating component is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide, a polyphthalamide film, or a polyphenylene sulfide film.

7. The battery cell according to any one of claims 1-6, wherein, The insulating component includes a first insulating portion and a second insulating portion, wherein the first insulating portion is disposed between the first adapter portion and the outer casing, and the second insulating portion is disposed between the second adapter portion and the outer casing.

8. The battery cell according to claim 7, wherein, The housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces; the second connecting portion has a welding area, which is electrically connected to the electrode tab. The distance between the side of the second insulating portion away from the first surface and the first surface is A1, and the distance between the side of the welding area away from the first surface and the first surface is A2, where A1 ≥ A2.

9. The battery cell according to claim 7 or 8, wherein, The second connecting portion has a welding area that is electrically connected to the electrode tab, and the second insulating portion covers the welding area.

10. The battery cell according to any one of claims 7-9, wherein, The housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces; the distance between the side of the first insulating part away from the first surface and the first surface is B, where 5mm≤B≤50mm.

11. The battery cell according to claim 10, wherein, 10mm≤B≤35mm.

12. The battery cell according to claim 10 or 11, wherein, The distance between the side of the first insulating portion near the first surface and the first surface is less than or equal to the distance between the side of the adapter near the first surface and the first surface.

13. The battery cell according to claim 7, wherein, The outer casing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces. The first surface is distributed on both sides of the battery cell along the thickness direction. The distance between the first insulating part and the second insulating part in a first direction is C, where C≤5mm, and the first direction intersects the thickness direction of the battery cell.

14. The battery cell according to any one of claims 1-6, wherein, The outer casing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces, and the first surface is distributed on both sides of the battery cell along the thickness direction; the battery cell also includes second surfaces on both sides along a first direction, and the distance between the side of the insulating member near the second surface and the second surface is less than or equal to the distance between the side of the adapter member near the second surface and the second surface; wherein, the first direction intersects the thickness direction of the battery cell.

15. The battery cell according to any one of claims 1-6, wherein, The thickness of the insulating component is D, where 20μm≤D≤200μm.

16. The battery cell according to claims 1-6, wherein, The outer casing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening; at least a portion of the insulating element is disposed between the adapter and the end cap.

17. The battery cell according to claim 16, wherein, The insulating component includes a third insulating portion and a fourth insulating portion, which are connected. The third insulating portion is disposed between the adapter and the end cap, and the fourth insulating portion is disposed between the electrode assembly and the housing.

18. The battery cell according to claim 17, wherein, The housing includes multiple surfaces, including a first surface, which is the surface with the largest area among the multiple surfaces, and the fourth insulating portion is disposed between the electrode assembly and the housing.

19. The battery cell according to any one of claims 1-6, wherein, The battery cell includes a lower plastic layer disposed between the outer casing and the electrode assembly, and at least a portion of the insulating component is attached to the lower plastic layer.

20. The battery cell according to any one of claims 7-19, wherein, The battery cell includes a lower plastic layer disposed between the outer casing and the electrode assembly. A groove is formed on the side of the lower plastic layer facing the electrode assembly. The second connecting portion is bent relative to the first connecting portion toward the top of the battery cell and extends into the groove.

21. The battery cell according to claim 20, wherein, At least a portion of the sidewall of the lower plastic away from the electrode assembly protrudes, so that the sidewall of the lower plastic corresponding to the sidewall near the electrode assembly is recessed to form the groove; or, at least a portion of the sidewall of the lower plastic near the electrode assembly is thinned to form the groove.

22. The battery cell according to any one of claims 7-16, wherein, The first insulating part and the second insulating part are an integral structure; and / or, both the first insulating part and the second insulating part are rectangular.

23. A battery device comprising a plurality of battery cells according to any one of claims 1-22.

24. An electrical device comprising a battery cell according to any one of claims 1-22 or a battery device according to claim 23, wherein the battery cell or the battery device is used to store or provide electrical energy.

25. An energy storage device comprising a battery cell according to any one of claims 1-22 or a battery device according to claim 23, wherein the battery cell or the battery device is used to store or provide electrical energy.

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