Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises an electrode assembly and two first insulating pieces, the electrode assembly comprises a main body and a tab, the tab is arranged at one end of the main body along a first direction, the tab comprises a plurality of tab pieces arranged in a stack, and the plurality of tab pieces comprise two outer tab pieces located at both sides in a stacking direction. Along the stacking direction of the tab piece, the two first insulating pieces are arranged at both sides of the two outer tab pieces, respectively, the first insulating piece comprises a sticky area and a non-sticky area, the non-sticky area covers part of the outer tab piece, the sticky area does not overlap the outer tab piece, and the sticky areas of the two first insulating pieces are bonded to each other. The battery monomer has high reliability.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the reliability of individual battery cells is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, which includes an electrode assembly and a first insulating member. The electrode assembly includes a body and tabs, with the tabs disposed at one end of the body along a first direction. Each tab includes a plurality of tab pieces stacked together, including two outermost tab pieces located on both sides of the stacking direction. Along the stacking direction of the tab pieces, at least two first insulating members are respectively disposed on both sides of the two outer tab pieces. Each first insulating member includes an adhesive region and a non-adhesive region, with the non-adhesive region covering at least a portion of the outer tab pieces and the adhesive region not overlapping with the outer tab pieces.

[0006] In the technical solution of this application embodiment, since the non-adhesive region covers at least a portion of the outer tab, multiple tabs can be gathered together by at least two first insulating members. This reduces the risk of multiple tabs bending freely and short-circuiting with the main body during tab bending. Furthermore, since the adhesive region does not overlap with the outer tab, the risk of the adhesive region pulling on the outer tab and causing tab cracking due to inconsistent bending paths between the first insulating members and the tab is reduced during tab bending. In summary, this structural design gives the battery cell higher reliability.

[0007] In one or more embodiments of the first aspect, at least two adhesive regions of the first insulating members are interconnected.

[0008] In the above scheme, since the adhesive regions of at least two first insulating components are interconnected, the first insulating components can be fixed through their own adhesive regions without the need for additional connecting components, which simplifies the assembly difficulty of the first insulating components and helps to make the structure of the battery cell more compact and improve the energy density of the battery cell.

[0009] In one or more embodiments of the first aspect, the adhesive region includes a first adhesive region and a second adhesive region, wherein the first adhesive regions of the two first insulating members are bonded to each other, and the second adhesive region is bonded to the body.

[0010] In the above solution, because the second adhesive region is bonded to the main body, the connection between the first insulating component and the electrode assembly has high stability. During the bending process of the electrode tab, the risk of displacement of the first insulating component, which could lead to accidental adhesion of the adhesive region to the outer electrode tab, can be effectively reduced. This further reduces the risk of the electrode tab cracking due to the adhesive region pulling on the outer electrode tab.

[0011] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the second direction, the projection of the first adhesive region does not overlap with the projection of the main body, the projection of the second adhesive region overlaps at least partially with the projection of the main body, and the second direction intersects the first direction.

[0012] In the above scheme, since the projection of the first adhesive region does not overlap with the projection of the main body in the same projection plane perpendicular to the second direction, the risk of the adhesive region accidentally sticking to the outer electrode tab can be further reduced, and the reliability of the battery cell can be further improved.

[0013] In one or more embodiments of the first aspect, the electrode assembly has two first surfaces disposed opposite each other along a second direction, and the second adhesive region is adhered to the first surfaces.

[0014] In the above scheme, the first surface can be used as the bonding reference for the first insulating component, which helps to reduce the assembly difficulty of the first insulating component.

[0015] In one or more embodiments of the first aspect, the first adhesive region includes a first sub-region and a second sub-region. Along a third direction, the first sub-region and the second sub-region are spaced apart. A non-adhesive region connects the first sub-region and the second sub-region. The third direction and the second direction are perpendicular to each other with the first direction.

[0016] In the above scheme, the two first insulating components are bonded to each other through a first sub-region and a second sub-region that are spaced apart. This not only provides a large bonding area between the two first insulating components, but also allows the first sub-region and the second sub-region to bear part of the stress when the battery cell is subjected to external force. The risk of stress concentration in a single first insulating component is low, the risk of damage to the first insulating component and insulation failure is low, and the reliability of the battery cell is high.

[0017] In one or more embodiments of the first aspect, along a third direction, a first sub-region is spaced apart from the tab, and a second sub-region is spaced apart from the tab.

[0018] In the above scheme, since the first sub-region is spaced apart from the electrode tab and the second sub-region is spaced apart from the electrode tab, there is a distance between the adhesive first sub-region and the electrode tab along the third direction. During the bending process of the electrode tab, the risk of displacement of the two first insulating components along the third direction, resulting in the adhesive region accidentally sticking to the outer electrode tab sheet, can be further reduced.

[0019] In one or more embodiments of the first aspect, the second adhesive region includes a third sub-region and a fourth sub-region, which are spaced apart along a third direction, and a non-adhesive region connects the third sub-region and the fourth sub-region.

[0020] In the above scheme, the first insulating component is bonded to the main body through the spaced third and fourth sub-regions. This not only provides a large bonding area between the first insulating component and the main body, but also allows the third and fourth sub-regions to bear part of the stress when the battery cell is subjected to external force. The risk of stress concentration in a single first insulating component is low, the risk of damage to the first insulating component and connection failure between the electrode assembly is low, and the reliability of the battery cell is high.

[0021] In one or more embodiments of the first aspect, the third sub-region is connected to the first sub-region, and the fourth sub-region is connected to the second sub-region.

[0022] In the above scheme, the third sub-region is connected to the first sub-region, and the fourth sub-region is connected to the second sub-region. This design allows the third and first sub-regions to be laid out in a unified manner during the fabrication of the first insulating component. Similarly, the fourth and second sub-regions can also be laid out in a unified manner. This layout simplifies the design process of the first insulating component and effectively reduces its manufacturing cost. In addition, the risk of tearing between the third and first sub-regions, leading to separation of the first insulating component from the main body, is relatively low, which is beneficial for ensuring a high connection strength between the first insulating component and the main body.

[0023] In one or more embodiments of the first aspect, along a third direction, the size of the first sub-region is L1, and the size of the second sub-region is L2, satisfying: 0.5mm≤L1≤15mm, 0.5mm≤L2≤15mm.

[0024] In the above scheme, when L1≥0.5mm, the first sub-region has a larger size, which is beneficial to the first insulating component having higher connection stability and the risk of insulation failure due to connection failure of the first insulating component is lower; when L1≤15mm, the size of the first sub-region is smaller, and the tensile force between the first insulating components is smaller during the bending process of the first insulating component with the tab, and the risk of damage to the first insulating component is lower; therefore, when 0.5mm≤L1≤15mm, while ensuring the first insulating component has higher connection stability, the risk of damage to the first insulating component during the bending process of the tab can also be reduced.

[0025] When L2 ≥ 0.5 mm, the second sub-region has a larger size, which is beneficial to the first insulator having higher connection stability and the risk of insulation failure due to connection failure of the first insulator is lower. When L2 ≤ 15 mm, the size of the second sub-region is smaller, and the tensile force between the first insulators is smaller during the bending process of the first insulator with the tab, and the risk of damage to the first insulator is lower. Therefore, when 0.5 mm ≤ L2 ≤ 15 mm, while ensuring the first insulator has higher connection stability, the risk of damage to the first insulator during the bending process of the tab can also be reduced.

[0026] In one or more embodiments of the first aspect, 1mm≤L1≤8mm, 1mm≤L2≤8mm.

[0027] In the above scheme, when L1≥1mm, it is beneficial to further improve the connection stability of the first insulating component and further reduce the risk of insulation failure caused by connection failure of the first insulating component; when L1≤8mm, it can further reduce the risk of damage to the first insulating component during the bending process of the electrode tab; therefore, when 1mm≤L1≤8mm, while further improving the connection stability of the first insulating component, it can also further reduce the risk of damage to the first insulating component during the bending process of the electrode tab.

[0028] When L2 ≥ 1 mm, it is beneficial to further improve the connection stability of the first insulating component and further reduce the risk of insulation failure caused by connection failure of the first insulating component. When L2 ≤ 8 mm, it can further reduce the risk of damage to the first insulating component during the bending process of the electrode tab. Therefore, when 1 mm ≤ L2 ≤ 8 mm, while further improving the connection stability of the first insulating component, it can also further reduce the risk of damage to the first insulating component during the bending process of the electrode tab.

[0029] In one or more embodiments of the first aspect, the first insulating member does not extend beyond both ends of the body along a third direction, and the third direction, the second direction, and the first direction are perpendicular to each other.

[0030] In the above scheme, since the first insulating component does not extend beyond the two ends of the main body along a third direction, the risk of the first insulating component coming into contact with other components of the battery cell, such as the casing, during the assembly of the electrode assembly is low, causing it to wrinkle, deform, and pull the tabs, further reducing the risk of the tabs tearing.

[0031] In one or more embodiments of the first aspect, the size of the second viscous region along the first direction is H, which satisfies: 3mm≤H≤350mm.

[0032] In the above scheme, when H≥3mm, the second adhesive region has a larger size, which is beneficial to have a greater adhesive strength between the second adhesive region and the main body, and the risk of insulation failure due to separation of the first insulating component from the main body is lower; when H≤350mm, the size of the second adhesive region is smaller, and the force of the first insulating component pulling the main body is smaller during the bending process of the first insulating component with the tab, and the risk of damage to the first insulating component and the main body is lower; therefore, when 3mm≤H≤350mm, while having a greater adhesive strength between the second adhesive region and the main body, the risk of damage to the first insulating component and the main body is also reduced.

[0033] In one or more embodiments of the first aspect, 5mm ≤ H ≤ 300mm.

[0034] In the above scheme, when H≥5mm, the risk of insulation failure caused by separation of the first insulating component from the main body can be further reduced; when H≤300mm, the risk of damage to the first insulating component and the main body can be further reduced; therefore, when 5mm≤H≤300mm, while further improving the bonding strength between the second adhesive zone and the main body, the risk of damage to the first insulating component and the main body can also be further reduced.

[0035] In one or more embodiments of the first aspect, the non-adhesive region includes a first non-adhesive region and a second non-adhesive region, the first non-adhesive region covering at least a portion of the outer electrode tab, the second non-adhesive region covering at least a portion of the body, and the first non-adhesive region and the second non-adhesive region being connected.

[0036] In the above scheme, since the tab is located at one end of the main body along the first direction, the adhesive area does not overlap with the outer tab sheet, the first non-adhesive area is connected to the second non-adhesive area, the first non-adhesive area covers at least part of the outer tab sheet, and the second non-adhesive area covers at least part of the main body. The non-adhesive area will cover part of the tab and part of the main body at the same time, and cover the connection between the two, thereby reducing the risk of damage due to excessive pulling force at the connection between the tab and the main body, and can further improve the reliability of the battery cell.

[0037] In one or more embodiments of the first aspect, the first non-adhesive region is transparent.

[0038] In the above solution, since the first non-adhesive region is transparent, the morphology of the tab can be directly observed through the first non-adhesive region. Non-destructive testing can be performed without removing the first insulating component, reducing the risk of production interruption due to testing. At the same time, it can also reduce the risk of tab damage caused by removing the first insulating component.

[0039] In one or more embodiments of the first aspect, the non-adhesive region further includes two connecting regions, which are spaced apart along a third direction that intersects with the first direction. Along the third direction, the first non-adhesive region is located between the two connecting regions, and the connecting regions connect the first non-adhesive region and the adhesive region.

[0040] In the above scheme, since the first non-adhesive region is located between the two connecting regions along the third direction, and the connecting region connects the first non-adhesive region and the adhesive region, the setting of the connecting region can increase the distance between the adhesive region and the tab in the third direction, and reduce the risk of the adhesive region accidentally sticking to the outer tab.

[0041] In one or more embodiments of the first aspect, the battery cell further includes an electrode lead-out component. A tab is welded to the electrode lead-out component to form a first connection portion, and a first insulating member does not overlap with the first connection portion. The first insulating member has a first edge away from the main body, and along the extending direction of the tab, the first edge is spaced apart from the first connection portion.

[0042] In the above scheme, since the first edge and the first connecting part are spaced apart along the extension direction of the tab, the risk of the first insulating part being damaged by welding is low during the welding process of the tab and the electrode lead-out component, and the tab of the battery cell can have good insulation performance with the main body.

[0043] In one or more embodiments of the first aspect, the battery cell further includes a support having an opening, a tab passing through the opening and electrically connected to an electrode lead-out member, and at least a portion of a first insulating member being located between the periphery of the opening and the tab.

[0044] In the above solution, the support member further improves the insulation performance between the electrode tab and the main body. Furthermore, the first insulating member reduces the risk of the electrode tab tearing due to peripheral friction between the electrode tab and the opening of the support member.

[0045] In one or more embodiments of the first aspect, the distance between the first edge and the first connecting portion along the extending direction of the tab is L. 3， The following conditions must be met: 1mm≤L3≤20mm.

[0046] In the above scheme, when L3≥1mm, there is a large distance between the first edge and the first connecting part, and the risk of the first insulating component being damaged due to the formation of the first connecting part is low; when L3≤20mm, the distance between the first edge and the first connecting part is small, which is conducive to making the area of ​​the outer electrode tab covered by the non-adhesive area of ​​the first insulating component larger, thereby improving the insulation performance between the electrode tab and the body; therefore, when 1mm≤L3≤20mm, while reducing the risk of damage to the first insulating component, it can also make the first insulating component and the body have good insulation performance.

[0047] In one or more embodiments of the first aspect, 3mm ≤ L3 ≤ 7mm.

[0048] In the above scheme, when L3≥3mm, the risk of the first insulating component being damaged due to the formation of the first connection portion is further reduced; when L3≤7mm, the insulation performance between the electrode tab and the main body is further improved; therefore, when 3mm≤L3≤7mm, while further reducing the risk of damage to the first insulating component, the insulation performance between the first insulating component and the main body can also be further improved.

[0049] In one or more embodiments of the first aspect, the electrode assembly is a stacked structure or a wound structure.

[0050] Secondly, this application provides a battery device that includes the battery cell described in one or more of the above embodiments.

[0051] In the above solutions, since the battery cells in one or more of the above embodiments have high reliability, the battery device including the battery cells in one or more of the above embodiments also has high reliability.

[0052] Thirdly, this application provides an electrical device that includes a battery cell or a battery device as described in one or more of the above embodiments, wherein the battery cell or battery device is used to provide electrical energy.

[0053] In the above solutions, since the battery cells in one or more of the above embodiments have high reliability, and the battery devices in one or more of the above embodiments also have high reliability, the power-consuming devices that include the battery cells in one or more of the above embodiments, or the power-consuming devices that include the battery devices in one or more of the above embodiments, also have high reliability.

[0054] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0055] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0056] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0057] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0058] Figure 3 Here are exploded views of individual battery cells from some embodiments of this application;

[0059] Figure 4 This is a schematic diagram of the partial structure of a battery cell according to some embodiments of this application;

[0060] Figure 5 This is a schematic diagram of a portion of the structure of a battery cell according to some embodiments of this application;

[0061] Figure 6 This is a schematic diagram of a partial structure of a battery cell according to other embodiments of this application;

[0062] Figure 7 This is a schematic diagram of a partial structure of a battery cell according to other embodiments of this application;

[0063] Figure 8 for Figure 7 A magnified view of a portion of point A in the middle.

[0064] Partial structural schematic diagrams of battery cells according to some embodiments of this application.

[0065] The reference numerals in the detailed embodiments are as follows:

[0066] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 12 - Battery Cell; 121 - Casing; 1211 - End Cap; 1212 - Housing; 122 - Electrode Assembly; 1221 - Main Body; 1222 - Tab; 1223 - First Surface; 123 - Electrode Terminal; 124 - Adapter; 125 - First Insulator; 1251 - Adhesive Region; 12511 - First Adhesive Region; 12511a - First Sub- Zone; 12511b - Second sub-zone; 12512 - Second adhesive zone; 12512a - Third sub-zone; 12512b - Fourth sub-zone; 1252 - Non-adhesive zone; 12521 - First non-adhesive zone; 12522 - Second non-adhesive zone; 12523 - Connecting zone; 1253 - First edge; 126 - First connecting part; 127 - Second connecting part; 128 - Support member; 1281 - Support part; 1282 - Isolation part; 1283 - Opening; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0067] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0069] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0070] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0072] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0073] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0074] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. 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, reduces the risk of short circuits while allowing active ions to pass through.

[0075] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0076] 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.

[0077] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0078] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0079] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0080] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative current collector.

[0081] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0083] 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.

[0084] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0085] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0086] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0087] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0088] 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.

[0089] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0090] In some embodiments, the electrolyte salt may include 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.

[0091] In some embodiments, the solvent may include at least one selected from 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 selected from 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.

[0092] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0095] As an example, inorganic solid electrolytes may include 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 phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0096] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0097] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly is a stacked structure.

[0099] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0100] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0101] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separator can be set continuously, either by folding or rolling between any adjacent positive or negative electrode plates.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] 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.

[0106] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0107] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0108] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0109] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0110] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0111] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0112] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0113] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0114] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0115] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0116] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0117] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0118] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of individual battery cells also needs to be considered.

[0119] To reduce the risk of short circuits between the tabs and the electrode assembly body in a battery cell, an insulating material is typically attached to the tabs before the electrode assembly is installed in the casing (before the tabs are bent). However, even with these precautions, short circuits can still occur between the tabs and the electrode assembly after installation. This can be due to several factors: First, the insulating material may not tightly wrap or close the tab, allowing it to easily contact the electrode assembly body during free bending, resulting in a short circuit. Second, the insulating material may shift, causing the previously separated tabs to directly contact the electrode assembly body, leading to a short circuit. Third, the tab may crack and puncture the insulating material during bending, causing contact between the tab and the electrode assembly body, also resulting in a short circuit. One reason for tab cracking is a mismatch between the bending path of the insulating material and the bending path of the tab itself. This causes the insulating material attached to the tab to pull on the tab during bending, leading to cracking and a short circuit between the electrode assembly body and the tab, ultimately affecting the overall reliability of the battery cell.

[0120] In view of this, this application provides a battery cell, which includes an electrode assembly and two first insulating members. The electrode assembly includes a body and tabs, with the tabs disposed at one end of the body along a first direction. Each tab includes a plurality of tab pieces stacked together, including two outermost tab pieces located on both sides of the stacking direction. Along the stacking direction of the tab pieces, at least two first insulating members are respectively disposed on both sides of the two outer tab pieces. Each first insulating member includes an adhesive region and a non-adhesive region. The non-adhesive region covers at least a portion of the outer tab pieces, and the adhesive region does not overlap with the outer tab pieces. Because the non-adhesive region covers at least a portion of the outer tab pieces, the plurality of tab pieces can be gathered together by the at least two first insulating members, thereby reducing the risk of short circuit between the plurality of tab pieces and the body during the bending process of the tabs. Furthermore, since the viscous region does not overlap with the outer tab, the risk of the viscous region pulling on the outer tab and causing it to crack during tab bending is reduced due to the inconsistent bending paths of the first insulating component and the tab. In summary, this structural design results in higher reliability for the battery cell.

[0121] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0122] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0123] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0124] For example, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. 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 for the power requirements of starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0125] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or a combination thereof to form a battery cell assembly, and then the battery cell assemblies can be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 12 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0126] For example, please refer to Figure 2 , Figure 2The exploded view of a battery device 100 according to some embodiments of this application shows that the battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing 11, which has a hollow interior structure, housing the plurality of battery cells 12. As shown in the figure, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the combined shape of the plurality of battery cells 12. Both the first housing 111 and the second housing 112 may have an opening 1283. For example, both the first housing 111 and the second housing 112 may be hollow cuboids, each with only one opening 1283. The opening 1283 of the first housing 111 and the opening 1283 of the second housing 112 are opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing 111 and the second housing 112 being fastened together.

[0127] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0128] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery cell assembly. The number of battery cells 12 included in a battery cell assembly is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies, which can be connected in series, parallel, or mixed connection.

[0129] Please refer to Figure 3 As shown, Figure 3The image shows an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity for accommodating the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 has an opening 1283 so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0130] The battery cell 12 may also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is provided with a corresponding adapter 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be configured as a single unit or multiple units, and multiple independent electrode assemblies 122 are disposed within the battery cell 12.

[0131] According to some embodiments of this application, please refer to Figures 3-6 This application provides a battery cell 12, which includes an electrode assembly 122 and a first insulating member 125. The electrode assembly 122 includes a main body 1221 and tabs 1222. The tabs 1222 are disposed at one end of the main body 1221 along a first direction X. The tabs 1222 include a plurality of tab pieces stacked together, including two outermost tab pieces located on both sides in the stacking direction. Along the stacking direction of the tab pieces, at least two first insulating members 125 are respectively disposed on both sides of the two outer tab pieces. The first insulating member 125 includes an adhesive region 1251 and a non-adhesive region 1252. The non-adhesive region 1252 covers at least a portion of the outer tab piece, and the adhesive region 1251 does not overlap with the outer tab piece.

[0132] In some embodiments, the battery cell 12 includes a housing 121, and an electrode assembly 122 is disposed within the housing 121. The housing 121 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 121 can have various structural forms. The housing 121 can also be made of various materials, including metals such as copper, iron, aluminum, steel, and aluminum alloys. Of course, the housing 121 can also be made of non-metallic materials.

[0133] In some embodiments, the housing 121 may include a housing 1212 and an end cap 1211. The housing 1212 has an internal cavity with an opening, meaning the housing 1212 is a hollow structure with one open end. The end cap 1211 covers the opening of the housing 1212 and forms a sealed connection to create a sealed space for accommodating the electrode assembly 122 and the electrolyte. The housing 1212 may have one opening, and the end cap 1211 closes this opening. Alternatively, the housing 121 may include two end caps 1211, and the housing 1212 may have two openings. The two end caps 1211 correspond one-to-one with the two openings and close their respective openings.

[0134] In some embodiments, the portion of the current collector without an active material layer forms a tab.

[0135] In some embodiments, the electrode tab may include a plurality of sub-electrode tabs spaced apart, the non-adhesive region 1252 simultaneously covers a portion of the plurality of sub-electrode tabs of the outer electrode tab, the adhesive region 1251 does not overlap with the plurality of sub-electrode tabs, wherein the adhesive regions 1251 of the two first insulating members 125 are bonded to each other.

[0136] In some embodiments, the tab 1222 can be a positive tab, and of course, the tab 1222 can also be a negative tab.

[0137] In some embodiments, the body 1221 of the electrode assembly 122 includes a portion in the current collector where an active material layer is disposed and a second insulating member, while the portion in the current collector without an active material layer forms a tab, and the second insulating member encloses the portion in the current collector where the active material layer is disposed. A portion of the adhesive region 1251 is adhered to the second insulating member. The second insulating member may be an insulating film.

[0138] In some embodiments, the first insulating element 125 is made of plastic. The material of the first insulating element 125 may include, but is not limited to, one or more of polyethylene terephthalate, polypropylene, and polyethylene.

[0139] In some embodiments, the first insulating member 125 includes a substrate and an adhesive layer. The portion of the substrate on which the adhesive layer is disposed forms an adhesive region 1251 of the first insulating member 125, and the portion of the substrate on which the adhesive layer is not disposed forms a non-adhesive region 1252 of the first insulating member 125. In some embodiments, the first insulating member 125 may be formed directly from an adhesive material and a non-adhesive material. The adhesive material may include, but is not limited to, natural rubber, synthetic rubber, and acrylic acid.

[0140] In some embodiments, please refer to Figure 6The adhesive region 1251 includes a first adhesive region 12511 and a second adhesive region 12512. The first adhesive regions 12511 of the two first insulating members 125 are bonded to each other, and the second adhesive region 12512 is bonded to the main body 1221. The first adhesive region 12511 includes a first sub-region 12511a and a second sub-region 12511b. Along the third direction Z, the first sub-region 12511a and the second sub-region 12511b are spaced apart, and the non-adhesive region 1252 connects the first sub-region 12511a, the second sub-region 12511b, and the second adhesive region 12512. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other. In other embodiments, please refer to Figure 5 The second viscous region 12512 connects the first sub-region 12511a and the second sub-region 12511b.

[0141] The adhesive area 1251 does not overlap with the outer tab, which means that the adhesive area 1251 does not contact the outer tab. Even if the bending path of the first insulating member 125 is inconsistent with that of the outer tab during the bending process of the tab 1222, the risk of the first insulating member 125 pulling the tab 1222 is relatively low.

[0142] The non-adhesive region 1252 covers at least a portion of the outer tabs, meaning that the first insulating member 125 facilitates the gathering of multiple tabs.

[0143] In some embodiments, at least two first insulating members 125 may be connected together by an additional connector. In other embodiments, two first insulating members 125 may also be connected together by means of heat fusion or the like.

[0144] In the technical solution of this application embodiment, the non-adhesive region 1252 covers at least a portion of the outer tab. This design allows multiple tabs to be gathered together by the two first insulating members 125, thereby reducing the risk of short circuits between the multiple tabs and the main body 1221 during the bending of the tab 1222. Furthermore, since the adhesive region 1251 does not overlap with the outer tab, the risk of the adhesive region 1251 pulling on the outer tab and causing the tab 1222 to crack during the bending of the tab 1222 is reduced due to the inconsistent bending paths of the first insulating member 125 and the tab 1222. In summary, this structural design gives the battery cell 12 higher reliability.

[0145] According to some embodiments of this application, please refer to Figures 3-6 At least two adhesive regions 1251 of the first insulating element 125 are interconnected.

[0146] The adhesive areas 1251 can be connected to each other by means of bonding, hot melt connection, etc.

[0147] The adhesive areas 1251 of at least two first insulating members 125 are interconnected, which means that while the two first insulating members 125 serve to gather the tabs 1222, there is no need to fix them together with additional connectors; they can be connected directly through their own adhesive areas 1251.

[0148] In the above scheme, since the adhesive regions 1251 of at least two first insulating members 125 are connected to each other, the first insulating member 125 can be fixed by the adhesive region 1251 of the first insulating member 125 itself, without the need for additional connecting members, which simplifies the assembly difficulty of the first insulating member 125, and at the same time helps to make the structure of the battery cell 12 more compact and improve the energy density of the battery cell 12.

[0149] According to some embodiments of this application, please refer to Figures 3-6 The adhesive area 1251 includes a first adhesive area 12511 and a second adhesive area 12512. The first adhesive areas 12511 of the two first insulating members 125 are bonded to each other, and the second adhesive area 12512 is bonded to the main body 1221.

[0150] In some embodiments, the first adhesive region 12511 may include a plurality of sub-regions, which are spaced apart.

[0151] The first adhesive regions 12511 of the two first insulating members 125 are bonded to each other, meaning that a portion of the first adhesive regions 12511 of the two first insulating members 125 are bonded to each other, thereby increasing the difficulty of separating the two first insulating members 125 from each other. In some embodiments, the tab 1222 is disposed at the first end of the body 1221 along the first direction X, and the first adhesive region 12511 can be understood as the portion of the adhesive region 1251 that extends beyond the first end of the body 1221 in the first direction X.

[0152] In the embodiment where the body 1221 of the electrode assembly 122 includes a portion in which an active material layer is disposed in the current collector and a second insulating member, the second adhesive region 12512 is bonded to the surface of the second insulating member of the body 1221 that is away from the current collector.

[0153] In the above solution, since the second adhesive region 12512 is bonded to the main body 1221, the connection between the first insulating member 125 and the electrode assembly 122 is highly stable. During the bending process of the tab 1222, the risk of displacement of the two first insulating members 125, leading to accidental adhesion of the adhesive region 1251 to the outer tab, is effectively reduced. This further reduces the risk of the tab 1222 cracking due to the adhesive region 1251 pulling on the outer tab.

[0154] According to some embodiments of this application, please refer to Figures 3-6In the same projection plane perpendicular to the second direction, the projection of the first adhesive region does not overlap with the projection of the main body, the projection of the second adhesive region overlaps with the projection of the main body at least partially, and the second direction intersects with the first direction.

[0155] In some embodiments, the electrode assembly 122 has a flat region on the electrode sheet. The electrode assembly 122 can be a stacked structure or a wound structure. There can be one or more electrode assemblies 122 in the housing 1212. If there are multiple electrode assemblies 122, they can be stacked. For example, multiple electrode assemblies 122 can be stacked along the stacking direction of the flat region of one of the electrode assemblies 122. The flat region is the flat portion of the electrode sheet of the electrode assembly 122. If the electrode assembly 122 is a stacked structure, it is a stacked electrode assembly 122, where the entire electrode sheet of the electrode assembly 122 is a flat region. If the electrode assembly 122 is a wound structure, the electrode sheet of the electrode assembly 122 also has a corner region, with a corner region provided at least at one end of the electrode sheet along a direction intersecting the flat region. The second direction Y is the stacking direction of the flat region of the electrode assembly 122.

[0156] In the above scheme, since the projection of the first adhesive region 12511 and the projection of the main body 1221 do not overlap in the same projection plane perpendicular to the second direction Y, the risk of the adhesive region 1251 accidentally sticking to the outer electrode tab can be further reduced, and the reliability of the battery cell 12 can be further improved.

[0157] According to some embodiments of this application, please refer to Figures 3-6 The electrode assembly 122 has two first surfaces 1223 disposed opposite to each other along the second direction Y, and the second adhesive region 12512 is bonded to the first surfaces 1223.

[0158] In some embodiments, the length of the first adhesive region 12511 is greater than the dimension of the body 1221 along the second direction Y, so that the two first adhesive regions 12511 have a larger adhesive area after being bonded together.

[0159] In some embodiments, the battery cell 12 is a square battery cell 12, and the surface of the battery cell 12 perpendicular to the second direction Y is the surface with the largest area in the battery cell 12.

[0160] In the embodiment of the electrode assembly 122 body 1221 including the portion in the current collector where an active material layer is disposed and the second insulating member, the first surface 1223 consists of two surfaces of the second insulating member disposed opposite to each other along the second direction Y.

[0161] In the above scheme, the first surface 1223 can be used as the bonding reference for the first insulating component 125, which helps to reduce the assembly difficulty of the first insulating component 125.

[0162] According to some embodiments of this application, please refer to Figures 3-6 The first adhesive region 12511 includes a first sub-region 12511a and a second sub-region 12511b. Along the third direction Z, the first sub-region 12511a and the second sub-region 12511b are spaced apart. The non-adhesive region 1252 connects the first sub-region 12511a and the second sub-region 12511b. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other.

[0163] In some embodiments, along the third direction Z, the non-adhesive region 1252 is located between the first sub-region 12511a and the second sub-region 12511b.

[0164] In the above scheme, the two first insulating members 125 are bonded to each other through the first sub-region 12511a and the second sub-region 12511b which are spaced apart. While providing a large bonding area between the two first insulating members 125, the first sub-region 12511a and the second sub-region 12511b can also bear part of the stress when the battery cell 12 is subjected to external force. The risk of stress concentration in a single first insulating member 125 is low, the risk of damage to the first insulating member 125 and insulation failure is low, and the reliability of the battery cell 12 is high.

[0165] According to some embodiments of this application, please refer to Figures 3-6 Along the third direction Z, the first sub-region 12511a is spaced apart from the tab 1222, and the second sub-region 12511b is spaced apart from the tab 1222.

[0166] Along the third direction Z, the first sub-region 12511a and the tab 1222 are spaced apart, and the second sub-region 12511b and the tab 1222 are also spaced apart. This means that along the third direction Z, there is a distance between the adhesive first sub-region 12511a and the second sub-region 12511b and the tab 1222. Even if the first insulating member 125 undergoes a slight displacement along the third direction Z, the risk of the adhesive area sticking to the tab 1222 is relatively low.

[0167] In the above scheme, during the bending process of the tab 1222, the risk of the two first insulating parts 125 being displaced along the third direction Z, causing the adhesive area 1251 to accidentally stick to the outer tab sheet, can be further reduced.

[0168] According to some embodiments of this application, please refer to Figures 3-6 The second adhesive region 12512 includes a third sub-region 12512a and a fourth sub-region 12512b. Along the third direction Z, the third sub-region 12512a and the fourth sub-region 12512b are spaced apart. The non-adhesive region 1252 connects the third sub-region 12512a and the fourth sub-region 12512b.

[0169] In some embodiments, the first sub-region 12511a is bent relative to the third sub-region 12512a, the second sub-region 12511b is bent relative to the fourth sub-region 12512b, the first sub-region 12511a and the third sub-region 12512a are not connected, and the second sub-region 12511b and the fourth sub-region 12512b are bent. For example, when manufacturing the first insulating member 125, a dividing line may be provided between the first sub-region 12511a and the third sub-region 12512a. During the process of bonding the first sub-regions 12511a of the two first insulating members 125 together, the first sub-region 12511a and the third sub-region 12512a separate along the dividing line, and the second sub-region 12511b and the fourth sub-region 12512b separate along the dividing line.

[0170] In the above scheme, the first insulating member 125 is bonded to the main body 1221 through the spaced third sub-region 12512a and fourth sub-region 12512b. While providing a large bonding area between the first insulating member 125 and the main body 1221, it also allows the third sub-region 12512a and fourth sub-region 12512b to bear part of the stress when the battery cell 12 is subjected to external force. The risk of stress concentration in a single first insulating member 125 is low. The risk of damage to the first insulating member 125 and connection failure between the electrode assembly 122 is low, and the reliability of the battery cell 12 is high.

[0171] According to some embodiments of this application, please refer to Figures 3-6 The third sub-region 12512a is connected to the first sub-region 12511a, and the fourth sub-region 12512b is connected to the second sub-region 12511b.

[0172] The third sub-region 12512a is connected to the first sub-region 12511a, and the fourth sub-region 12512b is connected to the second sub-region 12511b. This means that the adhesive regions 1251 of the first insulating member 125 can be uniformly arranged. After the adhesive regions 1251 are bonded to the main body 1221, the third sub-region 12512a and the fourth sub-region 12512b are formed. After the adhesive regions 1251 of the two first insulating members 125 are bonded to each other, the first sub-region 12511a and the second sub-region 12511b are formed.

[0173] In the above scheme, the third sub-region 12512a is connected to the first sub-region 12511a, and the fourth sub-region 12512b is connected to the second sub-region 12511b. This design allows the third sub-region 12512a and the first sub-region 12511a to be laid out in a unified manner when manufacturing the first insulating component 125. Similarly, the fourth sub-region 12512b and the second sub-region 12511b can also be laid out in a unified manner. This layout simplifies the design process of the first insulating component 125 and effectively reduces its manufacturing cost. In addition, the risk of tearing between the third sub-region 12512a and the first sub-region 12511a, causing the first insulating component 125 to separate from the main body 1221, is relatively low, which is conducive to ensuring a high connection strength between the first insulating component 125 and the main body 1221.

[0174] According to some embodiments of this application, please refer to Figures 3-6 Along the third direction Z, the size of the first sub-region 12511a is L1, and the size of the second sub-region 12511b is L2, satisfying: 0.5mm≤L1≤15mm, 0.5mm≤L2≤15mm.

[0175] Along the third direction Z, the size of the first sub-region 12511a can be any value between 0.5mm and 15mm, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7 The value of any one of the following: 0.4mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, or a range of values ​​between any two.

[0176] Along the third direction Z, the size of the second sub-region 12511b can be any value between 1 mm and 8 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm, 7.2 mm, 7.4 mm. The values ​​are any one of the following: mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, or any range of values ​​between two of these.

[0177] In the above scheme, when L1≥0.5mm, the first sub-region 12511a has a larger size, which is beneficial to the first insulating member 125 having higher connection stability and the risk of insulation failure due to connection failure of the first insulating member 125 is lower; when L1≤15mm, the size of the first sub-region 12511a is smaller, and the tensile force between the first insulating members 125 is smaller during the bending process of the first insulating member 125 with the tab 1222, and the risk of damage to the first insulating member 125 is lower; therefore, when 0.5mm≤L1≤15mm, while ensuring high bonding strength between the first insulating members 125, the risk of damage to the first insulating member 125 during bending with the tab 1222 can also be reduced.

[0178] When L2 ≥ 0.5 mm, the second sub-region 12511b has a larger size, which is beneficial to the first insulating element 125 having higher connection stability and the risk of insulation failure due to connection failure of the first insulating element 125 is lower. When L2 ≤ 15 mm, the size of the second sub-region 12511b is smaller, and the tensile force on the first insulating element 125 is smaller during the bending process of the first insulating element 125 with the tab 1222, and the risk of damage to the first insulating element 125 is lower. Therefore, when 0.5 mm ≤ L2 ≤ 15 mm, while ensuring the first insulating element 125 has higher connection stability, the risk of damage to the first insulating element 125 during the bending process of the tab 1222 can also be reduced.

[0179] According to some embodiments of this application, please refer to Figures 3-6 3mm≤L1≤8mm, 3mm≤L2≤8mm.

[0180] Along the third direction Z, the size of the first sub-region 12511a can be any value between 1 mm and 8 mm, for example, any point value or a range between any two of the following: 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm.

[0181] Along the third direction Z, the size of the second sub-region 12511b can be any value between 1 mm and 8 mm, for example, any point value or a range between any two of the following: 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm.

[0182] In the above scheme, when L1≥1mm, it is beneficial to further improve the connection stability of the first insulating component 125 and further reduce the risk of insulation failure caused by connection failure of the first insulating component 125; when L1≤8mm, it can further reduce the risk of damage to the first insulating component 125 during bending with the tab 1222; therefore, when 1mm≤L1≤8mm, while further improving the connection stability of the first insulating component 125, it can also further reduce the risk of damage to the first insulating component 125 during bending with the tab 1222.

[0183] When L2 ≥ 1 mm, it is beneficial to further improve the connection stability of the first insulating component 125 and further reduce the risk of insulation failure caused by connection failure of the first insulating component 125. When L2 ≤ 8 mm, it can further reduce the risk of damage to the first insulating component 125 during bending of the tab 1222. Therefore, when 1 mm ≤ L2 ≤ 8 mm, while further improving the connection stability of the first insulating component 125, it can also further reduce the risk of damage to the first insulating component 125 during bending of the tab 1222.

[0184] According to some embodiments of this application, please refer to Figures 3-6 The first insulating element 125 does not extend beyond the two ends of the main body 1221 along the third direction Z, and the third direction Z, the second direction Y, and the first direction X are perpendicular to each other.

[0185] The first insulating member 125 does not extend beyond the two ends of the main body 1221 along the third direction Z. This means that the wall portions of the battery cell 12 on both sides of the third direction Z, or the components disposed inside the battery cell 12 on both sides of the electrode assembly 122 in the third direction Z, will not come into contact with the first insulating member 125 when the electrode assembly 122 is installed in the casing. The risk of the first insulating member 125 being pulled and thus pulling the tab 1222 is low.

[0186] In the above scheme, since the first insulating component 125 does not extend beyond the two ends of the main body 1221 along the third direction Z, the risk of the first insulating component 125 contacting other components of the battery cell 12, such as the outer shell 121, during the assembly of the electrode assembly 122, causing it to wrinkle and deform and pull the tab 1222, is low, further reducing the risk of the tab 1222 tearing.

[0187] According to some embodiments of this application, please refer to Figures 3-6 Along the first direction X, the size of the second viscous region 12512 is H, which satisfies: 3mm≤H≤350mm.

[0188] Along the first direction X, the size of the second viscous region 12512 can be any value between 5 mm and 300 mm, for example, 3 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 125 mm, 130 mm, 135 mm, 140 mm, 14 The value of any one of the following: 5mm, 150mm, 155mm, 160mm, 165mm, 170mm, 175mm, 180mm, 185mm, 190mm, 195mm, 200mm, 205mm, 210mm, 215mm, 220mm, 225mm, 230mm, 235mm, 240mm, 245mm, 250mm, 255mm, 260mm, 265mm, 270mm, 275mm, 280mm, 285mm, 290mm, 295mm, 300mm, etc., or a range of values ​​between any two.

[0189] In the above scheme, when H≥3mm, the second adhesive region 12512 has a larger size, which is beneficial to have a larger adhesive strength between the second adhesive region 12512 and the main body 1221, and the risk of insulation failure due to separation of the first insulating component 125 from the main body 1221 is lower; when H≤350mm, the size of the second adhesive region 12512 is smaller, and the force of the first insulating component 125 pulling the main body 1221 is smaller during the bending process of the first insulating component 125 with the tab 1222, and the risk of damage to the first insulating component 125 and the main body 1221 is lower; therefore, when 3mm≤H≤350mm, while having a larger adhesive strength between the second adhesive region 12512 and the main body 1221, the risk of damage to the first insulating component 125 and the main body 1221 is also reduced.

[0190] According to some embodiments of this application, please refer to Figures 3-6 , 5mm≤H≤300mm.

[0191] Along the first direction X, the size of the second viscous region 12512 can be any value between 5 mm and 300 mm, for example, any point value or a range between any two of the following: 5 mm, 20 mm, 40 mm, 60 mm, 80 mm, 100 mm, 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm.

[0192] In the above scheme, when H≥5mm, the risk of insulation failure caused by separation of the first insulating component 125 from the main body 1221 can be further reduced; when H≤300mm, the risk of damage to the first insulating component 125 and the main body 1221 can be further reduced; therefore, when 5mm≤H≤300mm, while further improving the bonding strength between the second adhesive region 12512 and the main body 1221, the risk of damage to the first insulating component 125 and the main body 1221 can also be further reduced.

[0193] According to some embodiments of this application, please refer to Figures 3-6 The non-adhesive region 1252 includes a first non-adhesive region 12521 and a second non-adhesive region 12522. The first non-adhesive region 12521 covers at least a portion of the outer electrode tab, and the second non-adhesive region 12522 covers at least a portion of the body 1221. The first non-adhesive region 12521 and the second non-adhesive region 12522 are connected.

[0194] The first non-adhesive region 12521 covers at least a portion of the outer tab, and the second non-adhesive region 12522 covers at least a portion of the main body 1221. The first non-adhesive region 12521 and the second non-adhesive region 12522 are connected. This means that the non-adhesive region 1252 will simultaneously cover part of the tab 1222 and part of the main body 1221, and cover the location where the two are connected.

[0195] In the above scheme, since the tab 1222 is disposed at one end of the main body 1221 along the first direction X, the adhesive region 1251 does not overlap with the outer tab sheet, the first non-adhesive region 12521 is connected to the second non-adhesive region 12522, the first non-adhesive region 12521 covers at least part of the outer tab sheet, and the second non-adhesive region 12522 covers at least part of the main body 1221. The non-adhesive region 1252 will simultaneously cover part of the tab 1222 and part of the main body 1221, and cover the position where the two are connected, thereby reducing the risk of damage due to excessive pulling force at the connection position between the tab 1222 and the main body 1221, and can further improve the reliability of the battery cell 12.

[0196] According to some embodiments of this application, the first non-adhesive region 12521 is transparent.

[0197] The first non-adhesive region 12521 is transparent, which means that the tab 1222 can be observed directly through the first non-adhesive region 12521. For example, the welding quality of the tab 1222 can be observed, whether it is corroded, contaminated or has mechanical damage.

[0198] In some embodiments, the transmittance of the first non-adhesive region 12521 is greater than or equal to 30% and less than or equal to 1. The transmittance can be determined by methods such as transmission method, spectrophotometry, integrating sphere method, and spectral transmission method.

[0199] In the above solution, since the first non-adhesive region 12521 is transparent, the morphology of the tab can be observed directly through the first non-adhesive region 12521. Non-destructive testing can be performed without removing the first insulating component 125, reducing the risk of production interruption due to testing. At the same time, it can also reduce the risk of damage to the tab 1222 caused by removing the first insulating component 125.

[0200] According to some embodiments of this application, please refer to Figures 3-6 The non-adhesive region 1252 also includes two connecting regions 12523. The two connecting regions 12523 are spaced apart along a third direction Z. The third direction Z intersects with the first direction X. Along the third direction Z, the first non-adhesive region 12521 is located between the two connecting regions 12523. The connecting regions 12523 connect the first non-adhesive region 12521 and the adhesive region 1251.

[0201] Along the third direction Z, the first non-adhesive region 12521 is located between two connecting regions 12523. The connecting regions 12523 connect the first non-adhesive region 12521 and the adhesive region 1251. This means that when the first insulating member 125 is displaced, the adhesive region 1251 needs to move at least the distance of the connecting regions 12523 along the third direction Z before it adheres to the tab 1222. Furthermore, during the assembly of the first insulating member 125, the presence of the connecting regions 12523 can also reduce the risk of the adhesive region 1251 adhering to the tab 1222 due to assembly errors in the first insulating member 125.

[0202] In the above scheme, since the first non-adhesive region 12521 is located between the two connecting regions 12523 along the third direction Z, the connecting region 12523 connects the first non-adhesive region 12521 and the adhesive region 1251. The setting of the connecting region 12523 can increase the distance between the adhesive region 1251 and the tab 1222 in the third direction Z, and reduce the risk of the adhesive region 1251 accidentally sticking to the outer tab.

[0203] According to some embodiments of this application, please refer to Figures 3-6 The battery cell 12 also includes an electrode lead-out component. The tab 1222 is welded to the electrode lead-out component to form a first connection portion 126, and the first insulating member 125 does not overlap with the first connection portion 126. The first insulating member 125 has a first edge 1253 away from the main body 1221, and the first edge 1253 is spaced apart from the first connection portion 126 along the extending direction of the tab 1222.

[0204] The electrode lead-out component can be a component that leads out electrical energy from the main body 1221.

[0205] In some embodiments, multiple tabs are welded to form a second connection portion 127, and the second connection portion 127 is welded to the electrode lead-out component to form a first connection portion 126. The second connection portion 127 can be a pre-welded solder mark of the electrode assembly 122, which on the one hand allows multiple tabs to be welded into an integral structure, reducing the risk of welding defects when forming the first connection portion 126, and on the other hand can also have the effect of gathering multiple tabs together.

[0206] In some embodiments, the battery cell 12 includes a housing 121 and electrode terminals 123. The housing 121 includes a first wall, and the electrode terminals 123 are disposed on the first wall. The first wall can be any part of the housing 121.

[0207] In some embodiments, the electrode lead-out component is an electrode terminal 123, and the tab 1222 is welded to the electrode terminal 123 to form a first connection portion 126.

[0208] In some embodiments, the electrode lead-out component includes an electrode terminal 123 and an adapter 124, with the electrode tab 1222 welded to the adapter 124 to form a first connection portion 126, and the adapter 124 welded to the electrode terminal 123.

[0209] Along the extension direction of the tab 1222, the first edge 1253 and the first connecting portion 126 are spaced apart, which means that there is a distance between the first edge 1253 and the first connecting portion 126. During the welding process, the risk of the welding heat causing the first insulating component 125 to be excessively deformed is low. Excessive deformation of the first insulating component 125 can refer to its bonding failure or insulation failure caused by melting due to heat, or it can refer to its bonding failure or insulation failure caused by softening.

[0210] In the above scheme, since the first edge 1253 and the first connecting part 126 are spaced apart along the extension direction of the tab 1222, the risk of the first insulating part 125 being damaged due to welding is low during the welding process of the tab 1222 and the electrode lead-out component, and the tab 1222 of the battery cell 12 can have good insulation performance with the main body 1221.

[0211] According to some embodiments of this application, please refer to Figures 3-8 The battery cell 12 also includes a support member 128 having an opening 1283, through which a tab 1222 passes and is welded to an electrode lead-out component, and at least a portion of a first insulating member 125 is located between the periphery of the opening 1283 and the tab 1222.

[0212] In some embodiments, please refer to Figure 8The battery cell 12 includes a housing 121 and electrode terminals 123. The housing 121 includes a first wall, and the electrode terminals 123 are disposed on the first wall. A support member 128 is located between the main body 1221 and the first wall. The support member 128 may include a support portion 1281 and an isolation portion 1282. The support portion 1281 and the isolation portion 1282 are fastened together to form the support member 128. A portion of the support portion 1281 is connected to the main body 1221. The support member 128 has a receiving cavity inside, and a portion of the electrode tab 1222 is located in the receiving cavity. After the support portion 1281 and the isolation portion 1282 are fastened together, an opening 1283 is formed. The opening 1283 communicates with the receiving cavity. The electrode tab 1222 passes through the support member 128 through the opening 1283 and is welded to the electrode lead-out component. The opening 1283 may be a notch or through hole provided in the support portion 1281, a notch or through hole provided in the isolation portion 1282, or a gap between the support portion 1281 and the isolation portion 1282. Of course, in some other embodiments, at least a portion of the adapter 124 may also be housed within the receiving cavity.

[0213] In some embodiments, the support member 128 may be made of an insulating material.

[0214] In the above solution, the support member 128 can further improve the insulation performance between the tab 1222 and the main body 1221. The first insulating member 125 can also reduce the risk of the tab 1222 tearing due to peripheral friction between the tab 1222 and the opening 1283 of the support member 128.

[0215] According to some embodiments of this application, please refer to Figures 3-6 Along the extending direction of the tab 1222, the distance between the first edge 1253 and the first connecting portion 126 is L. 3， The following conditions must be met: 1mm≤L3≤20mm.

[0216] Along the extending direction of the tab 1222, the distance between the first edge 1253 and the first connecting portion 126 can be any value between 1 mm and 20 mm, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4 mm. 6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7. 6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, 10.2mm, 10.4mm , 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13m m, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, 15.2mm, 15.4mm, 15 The value of any one of the following: 0.6mm, 15.8mm, 16mm, 16.2mm, 16.4mm, 16.6mm, 16.8mm, 17mm, 17.2mm, 17.4mm, 17.6mm, 17.8mm, 18mm, 18.2mm, 18.4mm, 18.6mm, 18.8mm, 19mm, 19.2mm, 19.4mm, 19.6mm, 19.8mm, 20mm, or a range between any two.

[0217] In the above scheme, when L3≥1mm, there is a large distance between the first edge 1253 and the first connecting part 126, and the risk of the first insulating component 125 being damaged by welding is low; when L3≤20mm, the distance between the first edge 1253 and the first connecting part 126 is small, which is beneficial for the non-adhesive area 1252 of the first insulating component 125 to cover more outer tabs, thereby improving the insulation performance between the tab 1222 and the body 1221; therefore, when 1mm≤L3≤20mm, while reducing the risk of the first insulating component 125 being damaged by welding, it also allows the first insulating component 125 and the body 1221 to have good insulation performance.

[0218] According to some embodiments of this application, please refer to Figures 3-6 , 3mm≤L3≤7mm.

[0219] Along the extension direction of the tab 1222, the distance between the first edge 1253 and the first connecting portion 126 can be any value between 3mm and 7mm, for example, any one of the following values ​​or a range between any two: 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm.

[0220] In the above scheme, when L3≥3mm, the risk of the first insulating member 125 being damaged due to the formation of the first connecting part 126 is further reduced; when L3≤7mm, the insulation performance between the tab 1222 and the main body 1221 is further improved; therefore, when 3mm≤L3≤7mm, while further reducing the risk of the first insulating member 125 being damaged, the insulation performance between the first insulating member 125 and the main body 1221 can also be further improved.

[0221] According to some embodiments of this application, the electrode assembly 122 is a stacked structure or a wound structure.

[0222] According to some embodiments of this application, please refer to Figure 2 This application provides a battery device 100, which includes the battery cell 12 in one or more of the above embodiments.

[0223] In the above scheme, since the battery cell 12 in one or more of the above embodiments has high reliability, the battery device 100 including the battery cell 12 in one or more of the above embodiments also has high reliability.

[0224] According to some embodiments of this application, please refer to Figure 1 This application provides an electrical device that includes a battery cell 12 or a battery device 100 as described in one or more of the above embodiments, wherein the battery cell 12 or the battery device 100 is used to provide electrical energy.

[0225] In the above solutions, since the battery cell 12 in one or more of the above embodiments has high reliability, and the battery device 100 in one or more of the above embodiments also has high reliability, the power-consuming device including the battery cell 12 in one or more of the above embodiments, or the power-consuming device including the battery device 100 in one or more of the above embodiments, also has high reliability.

[0226] According to some embodiments of this application, refer to Figure 4 and Figure 6This application provides a battery cell 12, which includes an electrode assembly 122 and two first insulating members 125. The electrode assembly 122 includes a main body 1221 and tabs 1222. The tabs 1222 are disposed at one end of the main body 1221 along a first direction X. The tabs 1222 include a plurality of tab pieces stacked together, including two outer tab pieces located on both sides of the stacking direction. Along the stacking direction of the tab pieces, the two first insulating members 125 are respectively disposed on both sides of the two outer tab pieces. The first insulating member 125 includes an adhesive region 1251 and a non-adhesive region 1252. The non-adhesive region 1252 covers a portion of the outer tab piece, and the adhesive region 1251 does not overlap with the outer tab piece. The adhesive regions 1251 of the two first insulating members 125 are bonded to each other. The adhesive region 1251 includes a first adhesive region 12511 and a second adhesive region 12512. The first adhesive regions 12511 of the two first insulating members 125 are bonded to each other, and the second adhesive region 12512 is bonded to the main body 1221. The electrode assembly 122 has two first surfaces 1223 arranged opposite each other along the second direction Y, and the second adhesive region 12512 is bonded to the first surface 1223. The first adhesive region 12511 includes a first sub-region 12511a and a second sub-region 12511b. Along the third direction Z, the first sub-region 12511a and the second sub-region 12511b are spaced apart. The non-adhesive region 1252 connects the first sub-region 12511a and the second sub-region 12511b. The third direction Z, the second direction Y, and the first direction X are all perpendicular to each other. Along the third direction Z, the first sub-region 12511a is spaced apart from the tab 1222, and the second sub-region 12511b is also spaced apart from the tab 1222. The second adhesive region 12512 includes a third sub-region 12512a and a fourth sub-region 12512b, which are spaced apart along the third direction Z. The non-adhesive region 1252 connects the third sub-region 12512a and the fourth sub-region 12512b. The third sub-region 12512a is connected to the first sub-region 12511a, and the fourth sub-region 12512b is connected to the second sub-region 12511b.

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An electrode assembly includes a body and an electrode tab, wherein the electrode tab is disposed at one end of the body along a first direction, and the electrode tab includes a plurality of electrode tab pieces stacked together, wherein the plurality of electrode tab pieces include two outermost electrode tab pieces located on both sides of the stacking direction. First insulating elements, along the stacking direction of the tabs, at least two first insulating elements are respectively disposed on both sides of the two outer tabs. The first insulating element includes an adhesive region and a non-adhesive region. The non-adhesive region covers at least a portion of the outer tab, and the adhesive region does not overlap with the outer tab.

2. The battery cell according to claim 1, characterized in that, At least two of the adhesive regions of the first insulating elements are interconnected.

3. The battery cell according to claim 1, characterized in that, The adhesive area includes a first adhesive area and a second adhesive area. The first adhesive areas of the two first insulating components are bonded to each other, and the second adhesive area is bonded to the main body.

4. The battery cell according to claim 3, characterized in that, In the same projection plane perpendicular to the second direction, the projection of the first adhesive region does not overlap with the projection of the main body, the projection of the second adhesive region overlaps at least partially with the projection of the main body, and the second direction intersects the first direction.

5. The battery cell according to claim 3, characterized in that, The electrode assembly has two first surfaces disposed opposite each other along a second direction, the second adhesive region is adhered to the first surfaces, and the second direction intersects the first direction.

6. The battery cell according to claim 5, characterized in that, The first viscous region includes a first sub-region and a second sub-region. Along a third direction, the first sub-region and the second sub-region are spaced apart. The non-viscous region connects the first sub-region and the second sub-region. The third direction and the second direction are perpendicular to the first direction.

7. The battery cell according to claim 6, characterized in that, Along the third direction, the first sub-region is spaced apart from the electrode tab, and the second sub-region is spaced apart from the electrode tab.

8. The battery cell according to claim 6, characterized in that, The second adhesive region includes a third sub-region and a fourth sub-region. The third sub-region and the fourth sub-region are spaced apart along the third direction. The non-adhesive region connects the third sub-region and the fourth sub-region.

9. The battery cell according to claim 8, characterized in that, The third sub-region is connected to the first sub-region, and the fourth sub-region is connected to the second sub-region.

10. The battery cell according to claim 6, characterized in that, Along the third direction, the size of the first sub-region is L1, and the size of the second sub-region is L2, satisfying: 0.5mm≤L1≤15mm, 0.5mm≤L2≤15mm.

11. The battery cell according to claim 10, characterized in that, 1mm≤L1≤8mm, 1mm≤L2≤8mm.

12. The battery cell according to claim 5, characterized in that, The first insulating element does not extend beyond the two ends of the main body along a third direction, and the third direction and the second direction are perpendicular to the first direction.

13. The battery cell of claim 5, wherein, Along the first direction, the size of the second viscous region is H, which satisfies: 3mm≤H≤350mm.

14. The battery cell of claim 5, wherein, 5mm≤H≤300mm.

15. The battery cell of claim 1, wherein, The non-adhesive region includes a first non-adhesive region and a second non-adhesive region. The first non-adhesive region covers at least a portion of the outer tab, and the second non-adhesive region covers at least a portion of the body. The first non-adhesive region and the second non-adhesive region are connected.

16. The battery cell of claim 15, wherein, The first non-adhesive region is transparent.

17. The battery cell of claim 15, wherein, The non-adhesive region further includes two connecting regions, which are spaced apart along a third direction that intersects with the first direction. Along the third direction, the first non-adhesive region is located between the two connecting regions, and the connecting regions connect the first non-adhesive region and the adhesive region.

18. The battery cell according to claim 1, characterized in that, The battery cell also includes an electrode lead-out component; The tab is electrically connected to the electrode lead-out component to form a first connection portion, and the first insulating member does not overlap with the first connection portion; The first insulating member has a first edge away from the body and along the extension direction of the tab, the first edge being spaced apart from the first connecting portion.

19. The battery cell of claim 18, wherein, The battery cell also includes a support member having an opening through which the tab passes and is electrically connected to the electrode lead-out member, and at least a portion of the first insulating member is located between the periphery of the opening and the tab.

20. The battery cell of claim 18, wherein, Along the extending direction of the electrode tab, the distance between the first edge and the first connecting portion is L. 3， The following conditions must be met: 1mm≤L3≤20mm.

21. The battery cell of claim 20, wherein, 3mm≤L3≤7mm.

22. The battery cell of claim 1, wherein, The electrode assembly has a stacked structure or a wound structure.

23. A battery device, characterized by Includes the battery cell as described in any one of claims 1-22.

24. An electrical device, comprising: Includes a battery cell as described in any one of claims 1-22 or a battery device as described in claim 23, wherein the battery cell or the battery device is used to provide electrical energy.

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