Battery and electric device

Abstract

A battery (100) and an electric device. The battery (100) comprises a plurality of cells (20) and a separator (30); and the plurality of cells (20) are arranged in a first direction. Each cell (20) comprises an electrode assembly (23); the electrode assembly (23) has a straight area (231) and two bent areas (232); and the two bent areas (232) are respectively located at two ends of the straight area (231) in a second direction. The thickness of the straight area (231) is D. In the second direction, areas offset by L1 towards the straight area (231) from positions where the straight area (231) and the bent areas (232) are connected are first areas (2311), and areas offset by L2 towards the bent areas (232) from the positions where the straight area (231) and the bent areas (232) are connected are second areas (2321), wherein L1<D and L2<D; and the first areas (2311) and the second areas (2321) constitute transition areas (233). The first direction intersects with the second direction. In the first direction, the separator (30) is located between two adjacent cells (20); and the projection of the separator (30) does not overlap the projection of at least one transition area (233). The separator (30) avoids the at least one transition area (233), to leave an expansion space for the transition area (233), thereby alleviating the stress concentration in the transition area (233), reducing the risk of electrode sheet breakage, and improving the reliability of the battery (100).

Description

Batteries and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202410708963.0 entitled "Battery and Electrical Equipment", filed on May 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and more specifically, to a battery and an electrical device. Background Technology

[0004] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, battery reliability must also be considered. However, current battery reliability is relatively poor.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a battery and an electrical device that aims to improve the poor reliability of batteries in related technologies.

[0007] In a first aspect, embodiments of this application provide a battery comprising a plurality of battery cells and a separator. The plurality of battery cells are arranged along a first direction. Each battery cell includes an electrode assembly, which includes a straight region and two bent regions. The two bent regions are located at opposite ends of the straight region along a second direction. The thickness of the straight region is D. Along the second direction, a region offset L1 from the connection point of the straight region and the bent region toward the straight region is a first region, and a region offset L2 from the connection point of the straight region and the bent region toward the bent region is a second region. The first region and the second region constitute a transition region of the electrode assembly, where L1 < D and L2 < D. The first direction and the second direction intersect. Along the first direction, the separator is disposed between two adjacent battery cells, and the projection of the separator does not overlap with the projection of at least one of the transition regions.

[0008] In the above technical solution, by setting a separator between two adjacent battery cells and ensuring that the projection of the separator along the first direction does not overlap with the projection of at least one transition zone along the first direction, the separator avoids at least one transition zone of the battery cell, leaving expansion space for the transition zone, reducing the suppression of deformation of the transition zone, reducing the external force on the transition zone, alleviating the stress concentration phenomenon in the transition zone, reducing the risk of electrode breakage, and also reducing the risk of burrs and debris generated at the breakage location piercing the separator, making it less likely for the positive electrode and negative electrode to contact and short-circuit, thus improving the reliability of the battery.

[0009] As an optional technical solution in the embodiments of this application, 0.1D≤L1≤0.2D, and / or 0.1D≤L2≤0.2D.

[0010] In the above technical solution, when 0.1D≤L1≤0.2D and 0.1D≤L2≤0.2D, the stress concentration in the transition zone is more obvious. By making the separator avoid at least one transition zone of the battery cell, it is more conducive to alleviating the stress concentration phenomenon in the transition zone, reducing the risk of electrode breakage, and improving the reliability of the battery.

[0011] As an optional technical solution in this application embodiment, L1 = L2 = 0.15D.

[0012] In the above technical solution, when L1=L2=0.15D, the stress concentration in the transition zone is more obvious. By making the separator avoid at least one transition zone of the battery cell, it is more conducive to alleviating the stress concentration phenomenon in the transition zone, reducing the risk of electrode breakage, and improving the reliability of the battery.

[0013] As an optional technical solution in this application embodiment, along the first direction, the projection of the separator does not overlap with the projections of the two transition zones.

[0014] In the above technical solution, by ensuring that the projection of the separator along the first direction does not overlap with the projection of the two transition regions along the first direction, the separator avoids the two transition regions of the battery cell, leaving expansion space for the two transition regions, reducing the suppression of deformation of the two transition regions, reducing the external force on the two transition regions, alleviating the stress concentration phenomenon in the two transition regions, further reducing the risk of electrode breakage, and improving the reliability of the battery.

[0015] As an optional technical solution in this application embodiment, the separator is provided with a hollow area, and along the first direction, the projection of at least one of the transition areas is located within the hollow area.

[0016] In the above technical solution, by setting a hollow area on the separator, on the one hand, the hollow area can avoid the transition area, leaving expansion space for the transition area, alleviating the stress concentration phenomenon in the transition area, reducing the risk of electrode breakage, and improving the reliability of the battery. On the other hand, the hollow area can reduce the material consumption of the separator and reduce the cost of the battery.

[0017] As an optional technical solution in this application embodiment, the separator is a ring structure, the ring structure defines a hollow area, and along the first direction, the projections of the two transition areas are both located within the hollow area.

[0018] In the above technical solution, when a battery cell expands, the middle part of the battery cell generally bulges out. By setting the separator as a ring structure and making the projections of the two transition zones along the first direction both located within a hollow area defined by the ring structure, not only is expansion space provided for the transition zone, but also expansion space is provided for the expansion of the battery cell. This helps to reduce the external force exerted on other structural components inside the battery when the battery cell expands, and helps to improve the reliability of the battery.

[0019] As an optional technical solution in this application embodiment, the elastic modulus of the separator is A, which satisfies: 0.1Gpa≤A≤ 300Gpa.

[0020] In the above technical solution, when the separator is a ring structure and the projections of the two transition zones along the first direction are both located within a hollow area defined by the ring structure, by ensuring A ≥ 0.1 GPa, the separator has a large elastic modulus, making it less prone to compression. This allows the separator to stably provide expansion space for the battery cells, reducing the external forces exerted on other structural components within the battery during expansion and improving battery reliability. By ensuring A ≤ 300 GPa, the elastic modulus of the separator is not excessively large, and the separator itself retains a certain degree of flexibility, allowing for flexible contact between the battery cells and the separator, reducing the risk of battery cell damage and improving battery cell reliability. Therefore, when 0.1 GPa ≤ A ≤ 300 GPa, it can stably provide expansion space for the battery cells while reducing the risk of damage due to rigid contact.

[0021] As an optional technical solution in this application embodiment, 1Gpa≤A≤10Gpa.

[0022] In the above technical solution, by ensuring A ≥ 1 GPa, the separator has a higher elastic modulus, making it less compressible. This allows the separator to provide more stable expansion space for the battery cells, reducing the external forces exerted on other structural components within the battery during expansion and improving battery reliability. By ensuring A ≤ 10 GPa, the elastic modulus of the separator is not excessively large, maintaining a degree of flexibility. This allows for flexible contact between the battery cells and the separator, reducing the risk of damage and improving battery cell reliability. Therefore, when 1 GPa ≤ A ≤ 10 GPa, it can stably provide expansion space for the battery cells while reducing the risk of damage due to rigid contact.

[0023] As an optional technical solution in this application embodiment, the separator is provided with a plurality of hollow areas, and the projections of the two transition areas along the first direction are respectively located in the two hollow areas.

[0024] In the above technical solution, by setting multiple hollow areas, the material consumption of the separator can be reduced, thereby lowering the cost of the battery. By positioning the projections of the two transition areas along the first direction within the two hollow areas, the two hollow areas can avoid the two transition areas, leaving expansion space for the transition areas, alleviating stress concentration in the transition areas, reducing the risk of electrode breakage, and improving the reliability of the battery.

[0025] As an optional technical solution in this application embodiment, the separator includes a ring body and a plurality of connecting ribs, the connecting ribs being connected to the ring body, and the plurality of connecting ribs and the ring body jointly defining a plurality of hollow areas.

[0026] In the above technical solution, the projection of the ring body along the first direction is arranged around the outer side of the projection of the transition area along the first direction. The connecting rib is connected to the ring body, which strengthens the structure of the ring body and gives the separator sufficient strength. The connecting rib and the ring body together define multiple hollow areas to avoid the transition area, alleviate the stress concentration phenomenon in the transition area, reduce the risk of electrode breakage, and improve the reliability of the battery.

[0027] As an optional technical solution in this application embodiment, two separators are provided between two adjacent battery cells, and the two separators are spaced apart along a third direction, which intersects with the first direction; the projections of the two transition regions along the first direction are both located between the projections of the two separators along the first direction along the third direction.

[0028] In the above technical solution, by setting two separators between two adjacent battery cells, the projections of the two transition zones along the first direction are both located between the projections of the two separators along the first direction along the third direction. That is, an expansion space for the transition zone to expand is formed between the two separators, so as to alleviate the stress concentration phenomenon in the transition zone, reduce the risk of electrode breakage, and improve the reliability of the battery.

[0029] As an optional technical solution in this application embodiment, along the second direction, the projection of the separator along the first direction is located between the projections of the two transition zones along the first direction.

[0030] In the above technical solution, by positioning the projection of the separator along the first direction along the second direction between the projections of the two transition zones along the first direction, the separator can avoid the transition zones while also preventing heat from being transferred from one battery cell to another to a certain extent. In this way, when one battery cell experiences thermal runaway, the heat is less likely to be transferred to another battery cell, causing the other battery cell to also experience thermal runaway, which is beneficial to improving the reliability of the battery.

[0031] As an optional technical solution in this application embodiment, the material of the separator includes heat-insulating material.

[0032] In the above technical solution, the material of the separator includes heat-insulating material, which makes the separator have better heat insulation performance. In this way, when one battery cell experiences thermal runaway, the heat is less likely to be transferred to another battery cell, causing the other battery cell to also experience thermal runaway, which is more conducive to improving the reliability of the battery.

[0033] As an optional technical solution in this application embodiment, along the first direction, the projected area of ​​the separator is S1, and the projected area of ​​the straight area is S2, satisfying: S1 / S2≥60%.

[0034] In the above technical solution, when S1 / S2≥60%, the separator can cover a large area of ​​the flat region, thus having a better heat insulation effect, which is beneficial to improving the reliability of the battery cell.

[0035] As an optional technical solution in this application embodiment, the elastic modulus of the separator is A, which satisfies: 1Mpa≤A≤100Mpa.

[0036] In the above technical solution, when the projection of the separator along the first direction along the second direction lies between the projections of the two transition zones along the first direction, by ensuring A ≤ 100 MPa, the separator has a smaller elastic modulus, making it easier to compress. Thus, when the battery cell expands, the separator is easily compressed, providing expansion space for the battery cell, which helps reduce the external force exerted on other structural components within the battery during expansion, thereby improving battery reliability. By ensuring A ≥ 1 MPa, the elastic modulus of the separator is not too small, reducing the risk of the separator being completely compacted under preload during manufacturing, allowing it to be compressed during battery cell expansion to provide expansion space.

[0037] As an optional technical solution in this application embodiment, 5MPa≤A≤10MPa.

[0038] In the above technical solution, when A ≤ 10 MPa, the separator has a smaller elastic modulus, making it easier to compress. This allows the separator to be easily compressed when the battery cell expands, providing expansion space and reducing the external forces exerted on other structural components within the battery during expansion, thus improving battery reliability. By ensuring A ≥ 5 MPa, the elastic modulus of the separator is not too small, reducing the risk of the separator being completely compacted under preload during manufacturing. This allows the separator to be compressed during battery cell expansion, providing expansion space.

[0039] As an optional technical solution in this application embodiment, the separator is a flat plate structure.

[0040] In the above technical solution, when the separator is a flat plate structure, it can better prevent heat from being transferred from one battery cell to another. In this way, when one battery cell experiences thermal runaway, the heat is less likely to be transferred to another battery cell, causing the other battery cell to also experience thermal runaway, which is beneficial to improving the reliability of the battery.

[0041] As an optional technical solution in this application embodiment, the separator is provided with a hollow area.

[0042] In the above technical solution, by setting a hollow area, the material consumption of the separator can be reduced, thereby lowering the cost of the battery.

[0043] As an optional technical solution in this application embodiment, the separator is provided with multiple hollow areas, and the multiple hollow areas are arranged in an array.

[0044] In the above technical solution, by setting multiple hollow areas, the material consumption of the separator can be further reduced, thereby lowering the cost of the battery.

[0045] As an optional technical solution in this application embodiment, a plurality of separators are spaced apart between two adjacent battery cells; along the second direction, the projections of the plurality of separators along the first direction are located between the projections of the two transition zones along the first direction.

[0046] In the above technical solution, by positioning the projections of multiple separators along the first direction along the second direction between the projections of the two transition zones along the first direction, the transition zones are avoided, thereby alleviating the stress concentration phenomenon in the transition zones, reducing the risk of electrode breakage, and improving the reliability of the battery.

[0047] As an optional technical solution in this application embodiment, the thickness of the separator along the first direction is H, which satisfies: 0.5mm≤H≤5mm.

[0048] In the above technical solutions, when H ≥ 0.5 mm, the separator thickness is relatively large, providing ample expansion space for the transition zone. This alleviates stress concentration in the transition zone, reduces the risk of electrode breakage, and improves battery reliability. When H ≤ 5 mm, the separator thickness is not excessive, which is beneficial for the separator's space occupancy within the battery and helps improve the battery's energy density. Therefore, when 0.5 mm ≤ H ≤ 5 mm, both battery reliability and energy density can be balanced.

[0049] As an optional technical solution in this application embodiment, 2mm≤H≤3mm.

[0050] In the above technical solutions, when H ≥ 2mm, the separator thickness is greater, providing more expansion space for the transition zone. This alleviates stress concentration in the transition zone, reduces the risk of electrode breakage, and improves battery reliability. When H ≤ 3mm, the separator thickness is not excessive, which is beneficial for the separator's space occupancy within the battery and helps improve the battery's energy density. Therefore, when 2mm ≤ H ≤ 3mm, a better balance between battery reliability and energy density can be achieved.

[0051] Secondly, embodiments of this application also provide an electrical device, the electrical device including the aforementioned battery, the battery being used to provide electrical energy to the electrical device. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0054] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0055] Figure 3 is a diagram showing the positional relationship between battery cells and separators provided in some embodiments of this application;

[0056] Figure 4 is a schematic diagram of the structure of the separator provided in some embodiments of this application;

[0057] Figure 5 is a top view of a separator provided in some embodiments of this application, which is disposed between two battery cells;

[0058] Figure 6 is an exploded view of a battery cell provided in some embodiments of this application;

[0059] Figure 7 is a top view schematic diagram of an electrode assembly provided in some embodiments of this application;

[0060] Figure 8 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some embodiments of this application;

[0061] Figure 9 is a diagram showing the positional relationship between the battery cell and the separator provided in some other embodiments of this application;

[0062] Figure 10 is a structural schematic diagram of the separator provided in some other embodiments of this application;

[0063] Figure 11 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application;

[0064] Figure 12 is a schematic diagram of the structure of the separator provided in some embodiments of this application;

[0065] Figure 13 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some embodiments of this application;

[0066] Figure 14 is a diagram showing the positional relationship between the battery cell and the separator provided in some embodiments of this application;

[0067] Figure 15 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some embodiments of this application;

[0068] Figure 16 is a diagram showing the positional relationship between the battery cell and the separator provided in some embodiments of this application;

[0069] Figure 17 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application;

[0070] Figure 18 is a diagram showing the positional relationship between the battery cell and the separator provided in some other embodiments of this application;

[0071] Figure 19 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application;

[0072] Figure 20 is a structural schematic diagram of a separator provided in some other embodiments of this application;

[0073] Figure 21 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application;

[0074] Figure 22 is a diagram showing the positional relationship between the battery cell and the separator provided in some other embodiments of this application;

[0075] Figure 23 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application;

[0076] Figure 24 is a diagram showing the positional relationship between the battery cell and the separator provided in some further embodiments of this application;

[0077] Figure 25 is a schematic diagram showing the projection relationship between the separator and the transition area provided in some other embodiments of this application.

[0078] Icons: 10-Box; 11-First part; 12-Second part; 20-Battery cell; 21-Outer shell; 211-Housing shell; 212-End cap; 23-Electrode assembly; 231-Straight area; 2311-First region; 232-Bending area; 2321-Second region; 233-Transition area; 2331-First boundary; 2332-Second boundary; 2333-Third boundary; 24-Electrode terminal; 30-Separator; 31-Hollowed area; 32-Ring; 33-Connecting rib; 331-Longitudinal rib; 332-Transverse rib; 100-Battery; 200-Controller; 300-Motor; 1000-Vehicle. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0080] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0081] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0082] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0084] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0085] In this application, "multiple" means two or more (including two).

[0086] 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.

[0087] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0088] 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, prevents short circuits while allowing active ions to pass through.

[0089] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0090] 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.

[0091] 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.).

[0092] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0093] 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.

[0094] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0095] 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 silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed 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.).

[0096] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0097] 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.

[0098] 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.

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

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

[0101] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0102] 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.

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

[0104] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0105] 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.

[0106] 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.

[0107] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0108] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0109] 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.

[0110] 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.

[0111] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0112] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0113] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0114] As an example, the separator can be continuously arranged and placed between any adjacent positive or negative electrode plates by winding.

[0115] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0116] 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.

[0117] 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.

[0118] 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, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0119] The battery mentioned in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity.

[0120] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0121] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0122] 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.

[0123] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0124] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as battery life, energy density, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must also be considered. However, current batteries have relatively poor reliability.

[0125] A single battery cell includes a casing and an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which are wound together to form the electrode assembly. The electrode assembly can be divided into a straight section and two bending sections, with the two bending sections connecting the two ends of the straight section. The area near the connection between the straight and bending sections is a transition zone. After a period of use, the electrode assembly expands. During this expansion, the straight section comes into contact with the casing, creating friction and hindering its expansion. The bending section expands outward, causing significant stress on the transition zone.

[0126] In existing technologies, adjacent battery cells are placed close together or separated by heat insulation pads, without providing expansion space for the transition zone. This suppresses deformation in the transition zone, causing secondary stress concentration and making the electrode in the transition zone prone to breakage. When an electrode breaks, burrs and even metal debris are generated at the fracture surface. These burrs and debris may puncture the separator, causing the positive and negative electrodes to overlap, resulting in a short circuit in the battery cell, potentially leading to fire or even explosion, thus reducing the reliability of the battery cell.

[0127] Therefore, this application provides a battery comprising multiple battery cells and separators, wherein the multiple battery cells are arranged along a first direction. Each battery cell includes an electrode assembly, which includes a flat region and two bent regions, the two bent regions being located at opposite ends of the flat region along a second direction. The thickness of the flat region is D. Along the second direction, a region offset L1 from the connection point of the flat region and the bent regions towards the flat region is a first region, and a region offset L2 from the connection point of the flat region and the bent regions towards the bent region is a second region. The first region and the second region constitute a transition region of the electrode assembly. L1 < D, L2 < D. The first direction and the second direction intersect. Along the first direction, a separator is disposed between two adjacent battery cells, and the projection of the separator does not overlap with the projection of at least one transition region.

[0128] By setting a separator between two adjacent battery cells, and ensuring that the projection of the separator along the first direction does not overlap with the projection of at least one transition region along the first direction, the separator avoids at least one transition region of the battery cell, leaving expansion space for the transition region. This reduces the suppression of deformation of the transition region, reduces the external force on the transition region, alleviates the stress concentration phenomenon in the transition region, and reduces the risk of electrode breakage. This also reduces the risk of burrs and debris generated at the breakage location piercing the separator, making it less likely for the positive and negative electrodes to contact and short-circuit, thus improving the reliability of the battery.

[0129] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0130] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0131] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0132] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0133] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0134] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0135] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0136] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0137] Please refer to Figures 3, 4, 5, 6, 7, and 8. Figure 3 is a diagram showing the positional relationship between the battery cell 20 and the separator 30 provided in some embodiments of this application. Figure 4 is a structural schematic diagram of the separator 30 provided in some embodiments of this application. Figure 5 is a top view of the separator 30 provided in some embodiments of this application disposed between two battery cells 20. Figure 6 is an exploded view of the battery cell 20 provided in some embodiments of this application. Figure 7 is a top view of the electrode assembly 23 provided in some embodiments of this application. Figure 8 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 provided in some embodiments of this application. This application provides a battery 100, which includes multiple battery cells 20 and separators 30, with the multiple battery cells 20 arranged along a first direction. Each battery cell 20 includes an electrode assembly 23, which includes a straight region 231 and two bending regions 232, with the two bending regions 232 located at opposite ends of the straight region 231 along a second direction. The thickness of the straight region 231 is D. Along the second direction, the region offset L1 from the connection point of the straight region 231 and the bend region 232 towards the straight region 231 is the first region 2311, and the region offset L2 from the connection point of the straight region 231 and the bend region 232 towards the bend region 232 is the second region 2321. The first region 2311 and the second region 2321 constitute the transition region 233 of the electrode assembly 23. L1 < D, L2 < D. The first direction and the second direction intersect. Along the first direction, the separator 30 is disposed between two adjacent battery cells 20, and the projection of the separator 30 does not overlap with the projection of at least one transition region 233.

[0138] A battery cell 20 refers to the smallest unit that makes up a battery 100. A battery 100 may include two, three, four, or more battery cells 20. Multiple battery cells 20 are arranged along a first direction, as shown in Figure 3, where the first direction is the X direction shown in Figure 3.

[0139] The battery cell 20 includes a housing 21 and an electrode assembly 23, which is housed within the housing 21.

[0140] The housing 21 includes an end cap 212 and a housing 211. The housing 211 has a receiving space with an opening at one end for accommodating the electrode assembly 23. The end cap 212 is connected to the housing 211 and closes the opening.

[0141] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is less prone to deformation under pressure and impact, enabling battery cell 20 to have higher structural strength and improved safety performance. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. Battery cell 20 also includes an insulating component disposed inside end cap 212. The insulating component can be used to isolate the electrical connection components inside housing 211 from end cap 212 to reduce the risk of short circuit. For example, the insulating component can be plastic, rubber, etc. Optionally, the end cap 212 may also be provided with electrode terminals 24, which are used to electrically connect with the tabs of the electrode assembly 23 to input or output electrical energy from the battery cell 20. The electrode terminals 24 and the tabs can be directly connected, for example, by direct welding. Alternatively, the electrode terminals 24 and the tabs can be indirectly connected, for example, through a current collector.

[0142] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common mating surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 23. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0143] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 21 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding and placing positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte.

[0144] The straight section 231 is the straight portion of the electrode assembly 23, and the bent section 232 is the bent portion at both ends of the electrode assembly 23. Referring to Figures 3, 4, 5, 6, 7, and 8, the electrode assembly 23 includes two straight sections 231, which connect to the two ends of the bent section 232 along a second direction. Referring to Figure 7, the second direction is the Y-direction shown in Figure 7. The angle between the first direction and the second direction can be acute or right angle. Referring to Figure 7, in the embodiment shown in Figure 7, the angle between the first direction and the second direction is a right angle, meaning the first direction and the second direction are perpendicular.

[0145] D represents the thickness of the straight section 231. Please refer to Figure 7, where the connection point between the straight section 231 and the bent section 232 is shown by a dashed line. It should be noted that the dashed line is only used to mark the connection point between the straight section 231 and the bent section 232 for easier illustration and does not represent the presence of a solid structure at that location.

[0146] Along the second direction, the first region 2311 is the region offset by L1 from the connection point of the straight region 231 and the bend region 232 towards the straight region 231. In other words, with the connection point of the straight region 231 and the bend region 232 as the first boundary 2331, the first boundary 2331 is offset by L1 towards the straight region 231 to form the second boundary 2332, and the first region 2311 is the region located between the first boundary 2331 and the second boundary 2332, where L1 < D.

[0147] Along the second direction, the second region 2321 is the region offset by L2 from the connection point of the straight region 231 and the bend region 232 towards the bend region 232. In other words, with the connection point of the straight region 231 and the bend region 232 as the first boundary 2331, the first boundary 2331 is offset by L2 towards the bend region 232 to form the third boundary 2333, and the second region 2321 is the region located between the first boundary 2331 and the third boundary 2333, where L2 < D.

[0148] It should be noted that L1 can be equal to L2, or L1 may not be equal to L2.

[0149] The transition region 233 includes only the first region 2311 and the second region 2321 described above. In other words, the region between the second boundary 2332 and the third boundary 2333 of the electrode assembly 23 is the transition region 233. Since the electrode assembly 23 includes two bending regions 232, correspondingly, the electrode assembly 23 also includes two transition regions 233, which are spaced apart along the second direction. Referring to Figures 7 and 8, the location of the transition region 233 is marked with a mesh line in this embodiment for easy illustration. It should be noted that the mesh line is only for marking the location of the transition region 233 to make the explanation more intuitive, and does not represent the existence of a physical structure at that location.

[0150] The separator 30 is a component used to separate two adjacent battery cells 20. In some embodiments, the separator 30 may be a heat insulation pad. In other embodiments, the separator 30 may be a gasket.

[0151] The projection of the separator 30 along the first direction does not overlap with the projection of at least one transition region 233. That is, the projection of the separator 30 along the first direction may not overlap with the projection of only one transition region 233, or the projection of the separator 30 along the first direction may not overlap with the projections of both transition regions 233.

[0152] Please refer to Figure 8. In Figure 8, the position of the electrode assembly 23 is marked by dashed lines to show the projection relationship between the separator 30 and the transition area 233.

[0153] By providing a separator 30 between two adjacent battery cells 20, and ensuring that the projection of the separator 30 along the first direction does not overlap with the projection of at least one transition region 233 along the first direction, the separator 30 avoids at least one transition region 233 of the battery cell 20, leaving expansion space for the transition region 233, reducing the suppression of deformation of the transition region 233, reducing the external force on the transition region 233, alleviating the stress concentration phenomenon in the transition region 233, reducing the risk of electrode breakage, and thus reducing the risk of burrs and debris generated at the breakage location piercing the separator, making it less likely for the positive and negative electrodes to contact and short-circuit, thereby improving the reliability of the battery 100.

[0154] In some embodiments, 0.1D≤L1≤0.2D, and / or, 0.1D≤L2≤0.2D.

[0155] The values ​​of L1 can be: L1 = 0.1D, 0.11D, 0.12D, 0.13D, 0.14D, 0.15D, 0.16D, 0.17D, 0.18D, 0.19D, 0.2D, etc.

[0156] The values ​​of L2 can be: L2 = 0.1D, 0.11D, 0.12D, 0.13D, 0.14D, 0.15D, 0.16D, 0.17D, 0.18D, 0.19D, 0.2D, etc.

[0157] When 0.1D≤L1≤0.2D and 0.1D≤L2≤0.2D, the stress concentration in the transition region 233 is more obvious. By making the separator 30 avoid at least one transition region 233 of the battery cell 20, it is more conducive to alleviating the stress concentration phenomenon in the transition region 233, reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0158] Optionally, L1 = L2 = 0.15D.

[0159] When L1 = L2 = 0.15D, the stress concentration in the transition zone 233 is more obvious. By making the separator 30 avoid at least one transition zone 233 of the battery cell 20, it is more conducive to alleviating the stress concentration phenomenon in the transition zone 233, reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0160] Please refer to Figures 3, 4, 5, 6, 7 and 8. In some embodiments, along the first direction, the projection of the separator 30 does not overlap with the projections of the two transition zones 233.

[0161] "The projection of the separator 30 along the first direction does not overlap with the projections of the two transition zones 233," that is, the projection of the separator 30 along the first direction does not overlap with the projections of the two transition zones 233 along the first direction.

[0162] By ensuring that the projection of the separator 30 along the first direction does not overlap with the projection of the two transition regions 233 along the first direction, the separator 30 avoids the two transition regions 233 of the battery cell 20, leaving expansion space for the two transition regions 233, reducing the suppression of deformation of the two transition regions 233, reducing the external force on the two transition regions 233, alleviating the stress concentration phenomenon of the two transition regions 233, further reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0163] Please refer to Figures 3, 4, 5, 6, 7 and 8. In some embodiments, the separator 30 is provided with a hollow area 31, and along the first direction, the projection of at least one transition area 233 is located within the hollow area 31.

[0164] The hollow area 31 is a hollowed-out area on the separator 30. The hollow area 31 can be formed by setting through holes on the separator 30. The hollow area 31 penetrates the separator 30 along the first direction.

[0165] Along the first direction, only one projection of the transition zone 233 may be located within the cutout zone 31, or both projections of the transition zones 233 may be located within the cutout zone 31. The projections of the two transition zones 233 along the first direction may be located within the two cutout zones 31 respectively, or they may be located within the same cutout zone 31.

[0166] By providing a hollow area 31 on the separator 30, on the one hand, the hollow area 31 can avoid the transition area 233, leaving expansion space for the transition area 233, alleviating the stress concentration phenomenon in the transition area 233, reducing the risk of electrode breakage, and improving the reliability of the battery 100. On the other hand, the hollow area 31 can reduce the material consumption of the separator 30 and reduce the cost of the battery 100.

[0167] Referring to Figures 3, 4, 5, 6, 7, and 8, in some embodiments, the separator 30 is an annular structure that defines a hollow area 31. Along the first direction, the projections of the two transition areas 233 are both located within the hollow area 31.

[0168] The separator 30 can be a circular ring structure or a rectangular frame structure. The projections of the two transition zones 233 along the first direction are both located inside the circular structure.

[0169] When the battery cell 20 expands, the middle part of the battery cell 20 usually bulges out. By setting the separator 30 as a ring structure and making the projections of the two transition zones 233 along the first direction both located within a hollow area 31 defined by the ring structure, not only is expansion space provided for the transition zone 233, but also for the expansion space of the battery cell 20. This helps to reduce the external force exerted on other structural components inside the battery 100 when the battery cell 20 expands, and helps to improve the reliability of the battery 100.

[0170] In some embodiments, the elastic modulus of the separator 30 is A, satisfying: 0.1 Gpa ≤ A ≤ 300 Gpa.

[0171] The elastic modulus is a measure of an object's ability to resist elastic deformation. The larger the value, the greater the stress required for the material to undergo a certain elastic deformation, that is, the greater the material stiffness, and the smaller the elastic deformation under a certain stress.

[0172] The elastic modulus of the separator 30 can be: A = 0.1 GPa, 1 GPa, 10 GPa, 20 GPa, 50 GPa, 80 GPa, 100 GPa, 120 GPa, 150 GPa, 180 GPa, 200 GPa, 220 GPa, 250 GPa, 280 GPa, 300 GPa, etc.

[0173] When the separator 30 is an annular structure, and the projections of the two transition zones 233 along the first direction are both located within a hollow area 31 defined by the annular structure, by ensuring A ≥ 0.1 GPa, the separator 30 has a large elastic modulus, making it less prone to compression. This allows the separator 30 to stably provide expansion space for the battery cell 20, which helps reduce the external force exerted on other structural components within the battery 100 during battery cell 20 expansion, thus improving the reliability of the battery 100. By ensuring A ≤ 300 GPa, the elastic modulus of the separator 30 is not excessively large, and the separator 30 itself still possesses a certain degree of flexibility, allowing for flexible contact between the battery cell 20 and the separator 30. This reduces the risk of damage to the battery cell 20 and improves its reliability. Therefore, when 0.1 GPa ≤ A ≤ 300 GPa, it can stably provide expansion space for the battery cell 20 while reducing the risk of damage to the battery cell 20 due to rigid contact.

[0174] Optionally, 1 Gpa ≤ A ≤ 10 Gpa.

[0175] The elastic modulus of the separator 30 can be: 1 GPa, 2 GPa, 3 GPa, 4 GPa, 5 GPa, 6 GPa, 7 GPa, 8 GPa, 9 GPa, 10 GPa, etc.

[0176] By ensuring A ≥ 1 GPa, the separator 30 has a higher elastic modulus, making it less compressible. This allows the separator 30 to provide more stable expansion space for the battery cell 20, reducing the external forces exerted on other structural components within the battery 100 during expansion and improving the reliability of the battery 100. By ensuring A ≤ 10 GPa, the elastic modulus of the separator 30 is not excessively large, maintaining a degree of flexibility. This allows for flexible contact between the battery cell 20 and the separator 30, reducing the risk of damage to the battery cell 20 and improving its reliability. Therefore, when 1 GPa ≤ A ≤ 10 GPa, it can stably provide expansion space for the battery cell 20 while reducing the risk of damage due to rigid contact.

[0177] Please refer to Figures 9, 10, and 11. In some embodiments, Figure 9 shows the positional relationship between the battery cell 20 and the separator 30 provided in other embodiments of this application. Figure 10 is a structural schematic diagram of the separator 30 provided in other embodiments of this application. Figure 11 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 provided in other embodiments of this application. In some embodiments, the separator 30 is provided with a plurality of hollow areas 31, and the projections of the two transition regions 233 along the first direction are respectively located within the two hollow areas 31.

[0178] The separator 30 can be configured with two, three, four, or more hollow areas 31.

[0179] Along the first direction, the projections of the two transition zones 233 are located within the two hollowed-out zones 31, respectively.

[0180] By setting multiple hollow areas 31, the material consumption of the separator 30 can be reduced, thereby lowering the cost of the battery 100. By positioning the projections of the two transition areas 233 along the first direction within the two hollow areas 31, the two hollow areas 31 can avoid the two transition areas 233, providing expansion space for the transition areas 233, alleviating stress concentration in the transition areas 233, reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0181] Referring to Figures 9, 10, and 11, in some embodiments, the separator 30 includes a ring 32 and a plurality of connecting ribs 33 connected to the ring 32. The plurality of connecting ribs 33 and the ring 32 together define a plurality of hollow areas 31.

[0182] The connecting rib 33 is connected to the inner side of the ring body 32, and the connecting rib 33 and the ring body 32 together define a plurality of hollow areas 31. Referring to Figures 9, 10 and 11, in the embodiment shown in the figures, the connecting rib 33 only includes longitudinal ribs 331, the extension direction of the longitudinal ribs 331 is perpendicular to the first direction and the second direction, and the longitudinal ribs 331 and the ring body 32 together define a plurality of hollow areas 31.

[0183] In other embodiments, the connecting rib 33 may consist only of the transverse rib 332, which extends along the second direction, and the transverse rib 332 and the ring body 32 together define a plurality of hollow areas 31.

[0184] Please refer to Figures 12 and 13. Figure 12 is a structural schematic diagram of the separator 30 provided in some embodiments of this application. Figure 13 is a schematic diagram of the projection relationship between the separator 30 and the transition area 233 provided in some embodiments of this application. In some embodiments, the connecting rib 33 includes longitudinal ribs 331 and transverse ribs 332, which are staggered. The longitudinal ribs 331, transverse ribs 332, and the ring body 32 together define multiple hollow areas 31.

[0185] The ring body 32 is arranged around the outer side of the transition region 233 along the first direction, with its projection along the first direction. The connecting rib 33 is connected to the ring body 32, which strengthens the structure of the ring body 32, giving the separator 30 sufficient strength. The connecting rib 33 and the ring body 32 together define multiple hollow areas 31 to avoid the transition region 233, alleviate stress concentration in the transition region 233, reduce the risk of electrode breakage, and improve the reliability of the battery 100.

[0186] Please refer to Figures 14 and 15. Figure 14 shows the positional relationship between the battery cell 20 and the separator 30 according to some embodiments of this application. Figure 15 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 according to some embodiments of this application. In some embodiments, two separators 30 are provided between two adjacent battery cells 20, and the two separators 30 are spaced apart along a third direction. The third direction intersects with the first direction. The projections of the two transition regions 233 along the first direction are both located between the projections of the two separators 30 along the first direction along the third direction.

[0187] Two separators 30 are provided between two adjacent battery cells 20, and the two separators 30 are spaced apart along a third direction.

[0188] The third direction can form an acute angle with the first direction, and the third direction can also form a right angle with the first direction. The third direction can be different from the second direction, and the third direction can also be the same as the second direction.

[0189] Referring to Figures 14 and 15, in the embodiment shown in the figures, the third direction is different from the second direction. The third direction is the Z direction shown in the figures, and the first direction, the second direction, and the third direction are perpendicular to each other. Along the third direction, the projections of the two transition zones 233 along the first direction are located between the projections of the two separators 30 along the first direction.

[0190] Please refer to Figures 16 and 17. Figure 16 shows the positional relationship between the battery cell 20 and the separator 30 according to some embodiments of this application. Figure 17 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 according to some embodiments of this application. In some embodiments, the third direction is the same as the second direction. Along the third direction, the projections of the two transition regions 233 along the first direction are located between the projections of the two separators 30 along the first direction.

[0191] By setting two separators 30 between two adjacent battery cells 20, the projections of the two transition regions 233 along the first direction are both located between the projections of the two separators 30 along the first direction along the third direction. That is, an expansion space is formed between the two separators 30 for the transition regions 233 to expand, so as to alleviate the stress concentration phenomenon in the transition regions 233, reduce the risk of electrode breakage, and improve the reliability of the battery 100.

[0192] Please refer to Figures 18 and 19. Figure 18 shows the positional relationship between the battery cell 20 and the separator 30 according to some other embodiments of this application. Figure 19 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 according to some other embodiments of this application. In some other embodiments, along the second direction, the projection of the separator 30 along the first direction is located between the projections of the two transition regions 233 along the first direction.

[0193] The projection of the separator 30 along the first direction is located between the projections of the two transition zones 233 along the first direction along the second direction.

[0194] By positioning the projection of the separator 30 along the first direction along the second direction between the projections of the two transition zones 233 along the first direction, the separator 30 can avoid the transition zones 233 while also preventing heat from being transferred from one battery cell 20 to another battery cell 20 to a certain extent. In this way, when one battery cell 20 experiences thermal runaway, the heat is less likely to be transferred to the other battery cell 20, causing the other battery cell 20 to also experience thermal runaway, which helps to improve the reliability of the battery 100.

[0195] In some embodiments, the material of the separator 30 includes a heat-insulating material.

[0196] Thermal insulation materials may include at least one of ceramic materials, asbestos materials, rock wool materials, and aerogel materials.

[0197] The separator 30 is made of heat-insulating material, which gives it better heat insulation performance. In this way, when one battery cell 20 experiences thermal runaway, the heat is less likely to be transferred to another battery cell 20, causing the other battery cell 20 to also experience thermal runaway, which is more conducive to improving the reliability of the battery 100.

[0198] In some embodiments, along the first direction, the projected area of ​​the separator 30 is S1, and the projected area of ​​the straight area 231 is S2, satisfying: S1 / S2≥60%.

[0199] S1 represents the projected area of ​​the separator 30 along the first direction. S2 represents the projected area of ​​the straight section 231 along the first direction. S1 / S2 represents the ratio of the projected area of ​​the separator 30 along the first direction to the projected area of ​​the straight section 231 along the first direction.

[0200] The ratio of the projected area of ​​the separator 30 along the first direction to the projected area of ​​the straight area 231 along the first direction can be: S1 / S2 = 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc.

[0201] When S1 / S2≥60%, the separator 30 can cover the flat area 231 over a larger area, thus achieving better heat insulation and improving the reliability of the battery cell 20.

[0202] Please refer to Figures 18 and 19. In some embodiments, the elastic modulus of the separator 30 is A, which satisfies: 1 MPa ≤ A ≤ 100 MPa.

[0203] The elastic modulus of the separator 30 can be: A = 1 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, 80 MPa, 90 MPa, 100 MPa, etc.

[0204] When the projection of the separator 30 along the first direction is located between the projections of the two transition zones 233 along the first direction along the second direction, by making A ≤ 100 MPa, the separator 30 has a small elastic modulus, making it easy to compress. Thus, when the battery cell 20 expands, the separator 30 is easily compressed, providing expansion space for the battery cell 20, which helps reduce the external force exerted on other structural components within the battery 100 during expansion, thereby improving the reliability of the battery 100. By making A ≥ 1 MPa, the elastic modulus of the separator 30 is not too small, reducing the risk of the separator 30 being completely compacted under preload during manufacturing, allowing the separator 30 to be compressed during battery cell 20 expansion, thus providing expansion space for the battery cell 20.

[0205] Optionally, 5 MPa ≤ A ≤ 10 MPa.

[0206] The elastic modulus of the separator 30 can be: A = 5 MPa, 5.5 MPa, 6 MPa, 6.5 MPa, 7 MPa, 7.5 MPa, 8 MPa, 8.5 MPa, 9 MPa, 9.5 MPa, 10 MPa, etc.

[0207] When A ≤ 10 MPa, the separator 30 has a smaller elastic modulus, making it easier to compress. This allows the separator 30 to be easily compressed when the battery cell 20 expands, providing expansion space and reducing the external forces exerted on other structural components within the battery 100 during expansion, thus improving the reliability of the battery 100. By ensuring A ≥ 5 MPa, the elastic modulus of the separator 30 is not too small, reducing the risk of it being completely compacted under preload during manufacturing. This allows the separator 30 to be compressed during battery cell 20 expansion, providing expansion space.

[0208] Please refer to Figures 18 and 19. In some embodiments, the separator 30 is a flat plate structure.

[0209] The separator 30 is a flat plate structure, and the separator 30 can be in the shape of a cuboid, a disc, etc.

[0210] When the separator 30 is a flat plate structure, it can better prevent heat from being transferred from one battery cell 20 to another battery cell 20. In this way, when one battery cell 20 experiences thermal runaway, the heat is less likely to be transferred to another battery cell 20, causing the other battery cell 20 to also experience thermal runaway, which helps to improve the reliability of the battery 100.

[0211] Please refer to Figures 20 and 21. Figure 20 is a structural schematic diagram of the separator 30 provided in some other embodiments of this application. Figure 21 is a schematic diagram of the projection relationship between the separator 30 and the transition area 233 provided in some other embodiments of this application. In some other embodiments, the separator 30 is provided with a hollow area 31.

[0212] By setting the hollow area 31, the material consumption of the separator 30 can be reduced, thereby lowering the cost of the battery 100.

[0213] The separator 30 has multiple hollow areas 31 arranged in an array.

[0214] The multiple cutout areas 31 can be arranged in a rectangular array or in a circular array.

[0215] Please refer to Figures 20 and 21. In the embodiment shown in the figures, multiple hollow areas 31 are arranged in a rectangular array.

[0216] By setting multiple hollow areas 31, the material consumption of the separator 30 can be reduced, thereby lowering the cost of the battery 100.

[0217] Please refer to Figures 22 and 23. Figure 22 is a diagram showing the positional relationship between the battery cell 20 and the separator 30 according to some other embodiments of this application. Figure 23 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 according to some other embodiments of this application. In some other embodiments, multiple separators 30 are spaced apart between two adjacent battery cells 20. Along the second direction, the projections of the multiple separators 30 along the first direction are located between the projections of the two transition regions 233 along the first direction.

[0218] Two, three, four, or more separators 30 can be provided between two adjacent battery cells 20. The multiple separators 30 are spaced apart. Referring to Figures 22 and 23, in the embodiment shown in the figures, the multiple separators 30 are spaced apart along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0219] Please refer to Figures 24 and 25. Figure 24 is a diagram showing the positional relationship between the battery cell 20 and the separator 30 according to some embodiments of this application. Figure 25 is a schematic diagram showing the projection relationship between the separator 30 and the transition region 233 according to some embodiments of this application. In some embodiments, multiple separators 30 are spaced apart along a second direction.

[0220] Along the second direction, the projections of the multiple separators 30 along the first direction are all located between the projections of the two transition zones 233 along the first direction.

[0221] By positioning the projections of multiple separators 30 along the first direction along the second direction between the projections of two transition regions 233 along the first direction, the transition regions 233 are avoided, thereby alleviating stress concentration in the transition regions 233, reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0222] Please refer again to Figures 3, 4, 5, 6, 7 and 8. In some embodiments, the thickness of the separator 30 along the first direction is H, which satisfies: 0.5mm≤H≤5mm.

[0223] H represents the thickness of the separator 30 along the first direction. During measurement, the thickness of the separator 30 can be measured at multiple different locations and the average value can be taken as H.

[0224] The thickness of the separator 30 along the first direction can be: H = 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0225] When H ≥ 0.5 mm, the separator 30 has a relatively large thickness, providing ample expansion space for the transition region 233. This alleviates stress concentration in the transition region 233, reduces the risk of electrode breakage, and improves the reliability of the battery 100. When H ≤ 5 mm, the separator 30's thickness is not excessive, which is beneficial for its space utilization within the battery 100 and helps improve the energy density of the battery 100. Therefore, when 0.5 mm ≤ H ≤ 5 mm, both the reliability and energy density of the battery 100 can be balanced.

[0226] Optionally, 2mm ≤ H ≤ 3mm.

[0227] The thickness of the separator 30 along the first direction can be: H = 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc.

[0228] When H ≥ 2 mm, the separator 30 is thicker, providing more expansion space for the transition region 233. This alleviates stress concentration in the transition region 233, reduces the risk of electrode breakage, and improves the reliability of the battery 100. When H ≤ 3 mm, the separator 30 is not too thick, which is beneficial for its space utilization within the battery 100 and helps improve the energy density of the battery 100. Therefore, when 2 mm ≤ H ≤ 3 mm, a better balance between the reliability and energy density of the battery 100 can be achieved.

[0229] This application embodiment also provides an electrical device, which includes the battery 100 described above, and the battery 100 is used to provide electrical energy to the electrical device.

[0230] Please refer to Figures 3 to 25 for some embodiments of this application.

[0231] This application provides a battery 100, which includes a plurality of battery cells 20 and separators 30. The plurality of battery cells 20 are arranged along a first direction. Each battery cell 20 includes an electrode assembly 23, which includes a straight region 231 and two bending regions 232. The two bending regions 232 are located at both ends of the straight region 231 along a second direction. The thickness of the straight region 231 is D. Along the second direction, a region offset by 0.15D from the connection point of the straight region 231 and the bending region 232 towards the straight region 231 is a first region 2311, and a region offset by 0.15D from the connection point of the straight region 231 and the bending region 232 towards the bending region 232 is a second region 2321. The first region 2311 and the second region 2321 constitute a transition region 233 of the electrode assembly 23. The first direction and the second direction intersect. Along the first direction, a separator 30 is disposed between two adjacent battery cells 20, and the projection of the separator 30 does not overlap with the projection of at least one transition region 233. By disposing a separator 30 between two adjacent battery cells 20 and ensuring that the projection of the separator 30 along the first direction does not overlap with the projection of at least one transition region 233 along the first direction, the separator 30 avoids at least one transition region 233 of the battery cell 20, leaving expansion space for the transition region 233, reducing the inhibition of deformation of the transition region 233, reducing the external force on the transition region 233, alleviating the stress concentration phenomenon in the transition region 233, reducing the risk of electrode breakage, and thus reducing the risk of burrs and debris generated at the breakage location piercing the separator, making it less likely for the positive and negative electrodes to contact and short-circuit, thereby improving the reliability of the battery 100.

[0232] Along the first direction, the projection of the separator 30 does not overlap with the projections of the two transition regions 233. By ensuring that the projection of the separator 30 along the first direction does not overlap with the projections of the two transition regions 233 along the first direction, the separator 30 avoids the two transition regions 233 of the battery cell 20, leaving expansion space for the two transition regions 233, reducing the suppression of deformation of the two transition regions 233, reducing the external force on the two transition regions 233, alleviating the stress concentration phenomenon in the two transition regions 233, further reducing the risk of electrode breakage, and improving the reliability of the battery 100.

[0233] In some embodiments, the separator 30 is an annular structure that defines a hollow area 31. Along the first direction, the projections of the two transition areas 233 are both located within the hollow area 31. When the battery cell 20 expands, the middle part of the battery cell 20 typically bulges. By setting the separator 30 as an annular structure and ensuring that the projections of the two transition areas 233 along the first direction are both located within the hollow area 31 defined by the annular structure, expansion space is provided not only for the transition areas 233 but also for the expansion of the battery cell 20. This helps to reduce the external force exerted on other structural components within the battery 100 when the battery cell 20 expands, thereby improving the reliability of the battery 100.

[0234] The elastic modulus of the separator 30 is A, satisfying: 1 GPa ≤ A ≤ 10 GPa. By ensuring A ≥ 1 GPa, the separator 30 has a larger elastic modulus, making it less compressible. This allows the separator 30 to provide more stable expansion space for the battery cell 20, reducing the external forces exerted on other structural components within the battery 100 during expansion and improving the reliability of the battery 100. By ensuring A ≤ 10 GPa, the elastic modulus of the separator 30 is not excessively large, maintaining a degree of flexibility. This allows for flexible contact between the battery cell 20 and the separator 30, reducing the risk of damage to the battery cell 20 and improving its reliability. Therefore, when 1 GPa ≤ A ≤ 10 GPa, it can stably provide expansion space for the battery cell 20 while reducing the risk of damage due to rigid contact.

[0235] In other embodiments, the projection of the separator 30 along the first direction is located between the projections of the two transition regions 233 along the first direction along the second direction. By positioning the projection of the separator 30 along the first direction along the second direction between the projections of the two transition regions 233 along the first direction, the separator 30 can avoid the transition regions 233 while also preventing heat transfer from one battery cell 20 to another to a certain extent. Thus, when one battery cell 20 experiences thermal runaway, heat is less likely to be transferred to the other battery cell 20, causing it to also experience thermal runaway, which helps improve the reliability of the battery 100.

[0236] The separator 30 is made of a heat-insulating material. This material provides better heat insulation, making it less likely for heat to be transferred to another battery cell 20 and cause it to also experience thermal runaway when one battery cell 20 experiences thermal runaway. This further improves the reliability of the battery 100.

[0237] At this point, 5 MPa ≤ A ≤ 10 MPa. When A ≤ 10 MPa, the separator 30 has a smaller elastic modulus, making it easier to compress. Thus, when the battery cell 20 expands, the separator 30 is easily compressed, providing expansion space for the battery cell 20. This helps reduce the external force exerted on other structural components within the battery 100 during battery cell expansion, improving the reliability of the battery 100. By ensuring A ≥ 5 MPa, the elastic modulus of the separator 30 is not too small, reducing the risk of the separator 30 being completely compacted under preload during manufacturing. This allows the separator 30 to be compressed during battery cell 20 expansion, providing expansion space for the battery cell 20.

[0238] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, wherein, The application relates to a battery cell, comprising: a plurality of battery cells arranged along a first direction, each battery cell comprising an electrode assembly, the electrode assembly comprising a flat section and two bent sections, the two bent sections being located at two ends of the flat section along a second direction, the flat section having a thickness D, a region offset from a connection position of the flat section and the bent section to the flat section by a distance L1 along the second direction being a first region, a region offset from the connection position of the flat section and the bent section to the bent section by a distance L2 along the second direction being a second region, the first region and the second region constituting a transition region of the electrode assembly, L1 < D, L2 < D, the first direction and the second direction intersecting each other; a separator arranged between two adjacent battery cells along the first direction, a projection of the separator not overlapping with a projection of at least one transition region.

2. The battery of claim 1, wherein, 0.1D <= L1 <= 0.2D, and / or 0.1D <= L2 <= 0.2D.

3. The battery of claim 2, wherein, L1 = L2 = 0.15D.

4. The battery of any one of claims 1-3, wherein, The projection of the separator along the first direction does not overlap with the projections of the two transition regions.

5. The battery of any one of claims 1-4, wherein, The separator is provided with a hollow region, and a projection of at least one transition region is located in the hollow region along the first direction.

6. The battery of claim 5, wherein, The separator is in a ring structure, and the ring structure defines a hollow region, and the projections of the two transition regions are both located in the hollow region along the first direction.

7. The battery of claim 6, wherein, The elastic modulus of the separator is A, and 0.1Gpa <= A <= 300Gpa.

8. The battery of claim 7, wherein, 1Gpa <= A <= 10Gpa.

9. The battery of any one of claims 5-8, wherein, The separator is provided with a plurality of hollow regions, and the projections of the two transition regions along the first direction are respectively located in the two hollow regions.

10. The battery of claim 9, wherein, The separator comprises a ring body and a plurality of connecting ribs connected to the ring body, and the connecting ribs and the ring body jointly define a plurality of hollow regions.

11. The battery of any one of claims 1-4, wherein, Two separators are arranged between two adjacent battery cells along a third direction intersecting the first direction. The projections of the two transition regions along the first direction are both located between the projections of the two separators along the first direction along the third direction.

12. The battery of any one of claims 1-4, wherein, The projection of the separator along the first direction is located between the projections of the two transition regions along the first direction along the second direction.

13. The battery of claim 12, wherein, The material of the separator comprises a heat-insulating material.

14. The battery of claim 13, wherein, The projection area of the separator along the first direction is S1, and the projection area of the flat section is S2, and S1 / S2 >= 60%.

15. The battery of any one of claims 12-14, wherein, The elastic modulus of the separator is A, and 1Mpa <= A <= 100Mpa.

16. The battery of claim 15, wherein, 5Mpa <= A <= 10Mpa.

17. The battery of any one of claims 12-16, wherein, The separator is in a flat plate structure.

18. The battery of any one of claims 12-16, wherein, The separator is provided with a hollow region.

19. The battery of claim 18, wherein, The separator is provided with a plurality of hollow regions, and the hollow regions are arranged in an array.

20. The battery of any one of claims 1-4, wherein, A plurality of separators are arranged between two adjacent battery cells along the first direction. The projections of the plurality of separators along the first direction are located between the projections of the two transition regions along the first direction along the second direction.

21. The battery of any one of claims 1-20, wherein, In the first direction, the thickness of the partition is H, satisfying: 0.5mm≤H≤5mm.

22. The battery of claim 21, wherein, 2mm≤H≤3mm.

23. An electrical device, comprising: The battery according to any one of claims 1-22, wherein the battery is configured to provide electrical energy to the electrical device.

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