Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises battery monomers and a plurality of heat management parts, the plurality of heat management parts are arranged along a first direction, and the battery monomers are arranged between two adjacent heat management parts along the first direction. The battery monomer comprises a shell and an end cover, at least one end of the shell along the second direction is provided with an opening, and the end cover seals the opening. The shell comprises a first wall in heat conduction connection with the heat management component, the first wall comprises a first area and a second area which are arranged in the second direction, and the thickness of the first area is larger than that of the second area. The end cover and the first wall are welded to form a connecting part, and the first area is located between the connecting part and the second area in the second direction. The thermal management component has a first end proximate the end cap, and at least a portion of the first region exceeds the first end in a direction in which the electrode assembly points to the end cap. The overlapping area of the heat management component and the first area in the first direction is reduced, the influence of the heat management component on the first area is reduced, and the service life of the battery device is effectively prolonged.

Description

Technical Field

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

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

[0003] In battery technology, the lifespan of battery devices is a crucial factor. Therefore, improving the lifespan of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the service life of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery cell and a plurality of thermal management components; the plurality of thermal management components are arranged along a first direction; the battery cell is disposed between two adjacent thermal management components along the first direction, and the battery cell includes a housing, an end cap, and an electrode assembly; the housing has an opening at at least one end along a second direction, and the housing includes a first wall that is thermally connected to the thermal management components, the first wall includes a first region and a second region arranged along the second direction, the thickness of the first region is greater than the thickness of the second region, and the second direction intersects the first direction; the end cap closes the opening, and the end cap is welded to the first wall to form a connection portion, and along the second direction, the first region is located between the connection portion and the second region; the electrode assembly is at least partially housed within the housing; wherein, along the second direction, the end of the thermal management component near the end cap is a first end, and at least a portion of the first region extends beyond the first end along the direction from the electrode assembly to the end cap.

[0006] In the above technical solution, the thickness of the first region is greater than that of the second region, and the first region is located between the connecting portion and the second region along the second direction. This makes the thicker first region closer to the connecting portion than the second region, thus strengthening the area of ​​the first wall near the connecting portion and reducing the risk of fatigue cracking in that area. Furthermore, since at least a portion of the first region extends beyond the first end of the thermal management component along the direction from the electrode assembly to the end cap, the overlap between the thermal management component and the first region in the first direction is reduced, decreasing the impact of the thermal management component on the first region. This allows the first region to exert a greater strengthening effect on the area of ​​the first wall near the connecting portion, improving the lifespan of the battery cell and thus effectively increasing the lifespan of the battery device.

[0007] In some embodiments, along a first direction, the second region has a first outer surface facing the exterior of the housing, the first outer surface directly or indirectly abutting against the thermal management component. The first region includes a first protrusion protruding from the first outer surface, at least a portion of the first protrusion extending beyond the first end in the direction from the electrode assembly to the end cap. This allows the first protrusion to effectively utilize the space at the first end of the thermal management component, reducing the overall size of the battery cell and the thermal management component along the first direction, resulting in a more compact structure for the battery cell and the thermal management component, improving space utilization, and contributing to increased volumetric energy density of the battery device.

[0008] In some embodiments, the orthographic projection of the first protrusion does not overlap with the orthographic projection of the thermal management component in a projection plane perpendicular to the first direction. This reduces the risk of interference between the first protrusion and the thermal management component, making the structure of the battery cell and the thermal management component more compact. It also reduces the risk of the thermal management component squeezing the first protrusion, thus reducing the impact of the thermal management component on the first region.

[0009] In some embodiments, the battery device includes a plurality of battery cells arranged along a first direction. A thermal management component is disposed between two adjacent battery cells along the first direction. The thermal management component located between two adjacent battery cells is a first thermal management component. The maximum thickness of the first thermal management component is D1, and the maximum thickness of the first protrusion is L1, where L1 ≤ D1 / 2. This ensures that the sum of the maximum thicknesses of the first protrusions of the battery cells on both sides of the first thermal management component does not exceed the maximum thickness of the first thermal management component. This reduces the risk of interference between the first protrusions of the battery cells on both sides of the first thermal management component, allowing the first thermal management component to be closer to the first outer surface of the second region of the adjacent battery cell, thereby improving the heat exchange efficiency between the first thermal management component and the adjacent battery cell.

[0010] In some embodiments, the battery device includes an end plate and a plurality of battery cells arranged along a first direction. A thermal management component is disposed between two adjacent battery cells along the first direction. The plurality of battery cells are located on the same side of the end plate. The thermal management component located between the end plate and the battery cell closest to the end plate is a second thermal management component. The maximum thickness of the second thermal management component is D2, and the maximum thickness of the first protrusion is L1, where L1 ≤ D2. This reduces the risk of interference between the first protrusion and the end plate, allowing the second thermal management component to be closer to the first outer surface of the second region of the adjacent battery cell, thereby improving the heat exchange efficiency between the second thermal management component and the adjacent battery cell.

[0011] In some embodiments, along the first direction, the thermal management component located between two adjacent battery cells is a first thermal management component. The maximum thickness of the first thermal management component is D1, where 0.3D1≤D2≤0.7D1. The first thermal management component needs to exchange heat with the battery cells on both sides, while the second thermal management component only needs to exchange heat with the battery cells on one side, where 0.3D1≤D2≤0.7D1. This allows the second thermal management component to meet the thermal management requirements for the battery cells on one side, while reducing the material used in the second thermal management component and the space occupied by the second thermal management component in the first direction. This frees up more space for the battery cells and helps to improve the volumetric energy density of the battery device.

[0012] In some embodiments, the end plate includes an overhang region extending beyond the first end in the direction from the electrode assembly toward the end cap, wherein at least a portion of the orthographic projection of the overhang region overlaps at least a portion of the orthographic projection of the first protrusion in a projection plane perpendicular to the first direction. This ensures that the overhang region has sufficient size in the second direction, improving the end plate's ability to constrain the second thermal management component.

[0013] In some embodiments, the thermal management component includes a main body region and a thinned region, the thickness of which is less than the thickness of the main body region. The main body region is thermally connected to a second region. Along a second direction, at least one end of the main body region is provided with a thinned region, and the end of the thinned region near the connection portion that is away from the main body region is designated as the first end. The thinned region's thickness is less than the thickness of the main body region, and the thinned region further reduces the impact of the thermal management component on the first region.

[0014] In some embodiments, the thickness of the thinning region decreases along the direction from the main body region to the thinning region. This structure of the thinning region is simple, allowing a gap to be formed between the weak region and the first wall, reducing the risk of compression between the weak region and the first region, and further reducing the impact of the thermal management components on the first region.

[0015] In some embodiments, a gap exists between the thinned region and the first wall along the first direction. This further reduces the impact of the thermal management components on the first region.

[0016] In some embodiments, the orthographic projection of the first region does not overlap with the orthographic projection of the thermal management component in a projection plane perpendicular to the first direction. This reduces the risk of the thermal management component being squeezed against the first region, and further reduces the impact of the thermal management component on the first region.

[0017] In some embodiments, along a first direction, the second region has a first outer surface facing the exterior of the housing and a first inner surface facing the interior of the housing. The first outer surface directly or indirectly abuts against the thermal management component. A portion of the first region protrudes from the first outer surface, and another portion of the first region protrudes from the first inner surface. With a fixed thickness, the portion of the first region protruding from both the first outer and first inner surfaces ensures that the thickness of the portion protruding from the first outer surface and the portion protruding from the first inner surface are not excessive, thus reducing the space occupied by the first region within the housing's interior or exterior.

[0018] In some embodiments, the first region includes a first protrusion protruding from a first outer surface and a second protrusion protruding from a first inner surface. Along a first direction, the maximum thickness of the first protrusion is L1, and the maximum thickness of the second protrusion is L2, where L1 > L2. The greater maximum thickness of the first protrusion and the smaller maximum thickness of the second protrusion allow the first protrusion to fully utilize the space at the first end of the thermal management component while reducing the space occupied by the second protrusion within the housing, thus freeing up more space for the electrode assembly.

[0019] In some embodiments, 0.05mm ≤ L1 ≤ 1.2mm.

[0020] In some embodiments, 0.05mm ≤ L2 ≤ 1mm.

[0021] In some embodiments, the first wall further includes a transition region connected to the end of the first region away from the second region along a second direction. The transition region is connected to a connecting portion, and the connection point between the transition region and the connecting portion forms a connection interface. The connection interface has a first position closest to the first region along the second direction, located at the end of the first region away from the second region along the second direction. The connection interface formed by the connection point between the transition region and the connecting portion provides a sufficiently large contact area, improving the robustness of the first wall after welding to the end cap.

[0022] In some embodiments, at least a portion of the connection interface extends obliquely relative to a first direction. After the end cap and the first wall are welded, the connection shrinks as it solidifies, generating tensile stress in the transition region. When the first wall is subjected to the expansion force of the electrode assembly, it deforms, generating tensile stress in the transition region on the connection. Because the connection interface extends obliquely relative to the first direction, the tensile stress generated by the connection due to shrinkage in the transition region near the portion of the connection interface that extends obliquely relative to the first direction is not in the same direction as the tensile stress generated by the transition region due to deformation of the first wall, reducing the risk of fatigue cracking in the area of ​​the transition region near the connection interface.

[0023] In some embodiments, the connection interface includes a first interface that extends obliquely from a first position toward the end cap. Along a first direction, at least a portion of the transition region is located between the first interface and the end cap. The connection portion protects the transition region. When the first wall is subjected to the expansion force of the electrode assembly, the deformation of the transition region during the stress process is blocked by the connection portion, reducing the risk of fatigue cracking in the area of ​​the transition region near the first interface.

[0024] In some embodiments, the first interface is connected to the outer surface of the first region at a first location. This brings the first region closer to the connection in the second direction, further reducing the risk of fatigue cracking of the area of ​​the first wall near the connection due to the expansion of the electrode assembly.

[0025] In some embodiments, the connection interface includes a second interface that extends obliquely from the first position toward the end cap. Along the first direction, at least a portion of the transition region is located on the side of the second interface away from the end cap. This allows the transition region to restrict the connection, reducing the risk of the connection detaching.

[0026] In some embodiments, the second interface is connected to the inner surface of the first region at a first location. This brings the first region closer to the connection in the first direction, further reducing the risk of fatigue cracking of the area of ​​the first wall near the connection due to the expansion of the electrode assembly.

[0027] In some embodiments, the Vickers hardness of the transition zone is less than that of the second zone; and / or, the Vickers hardness of the transition zone is less than that of the connecting portion. If the Vickers hardness of the transition zone is less than that of the second zone, the transition zone with lower Vickers hardness connects with the connecting portion, which can alleviate the rigid tension between the first wall and the connecting portion when the first wall deforms, reducing the risk of separation between the first wall and the connecting portion. If the Vickers hardness of the transition zone is less than that of the connecting portion, the transition zone is more prone to deformation than the connecting portion, which can alleviate the rigid tension between the first wall and the connecting portion when the first wall deforms, reducing the risk of separation between the first wall and the connecting portion.

[0028] In some embodiments, at least a portion of the Vickers hardness of the first region is less than that of the second region. When the second region deforms under the expansion force of the electrode assembly, the region in the first region with a lower Vickers hardness than the second region can reduce the impact of the deformation of the second region on the area of ​​the first wall near the connection, thereby reducing the risk of fatigue cracking of the area of ​​the first wall near the connection due to the expansion of the electrode assembly.

[0029] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, at least a portion of the positive electrode and at least a portion of the negative electrode are stacked along a first direction, and the first wall is the wall with the largest outer surface area in the housing. This allows the thermal management component to be thermally connected to the wall with the largest outer surface area in the housing, thereby improving the heat exchange efficiency between the thermal management component and the battery cell, and enabling rapid cooling or heating of the battery cell.

[0030] In some embodiments, the electrode assembly has a flat region, and portions of the positive electrode and negative electrode located in the flat region are stacked along a first direction. The first direction is the stacking direction of the portions of the positive and negative electrode located in the flat region. During cycling, the electrode assembly expands more along the first direction, and the first wall is more significantly affected by this expansion. Because the first region reinforces the area of ​​the first wall near the connection, the risk of fatigue cracking of the first wall near the connection due to electrode assembly expansion is reduced.

[0031] In some embodiments, the electrode assembly is a wound structure, and the electrode assembly further has a corner region. The corner region is located at at least one end of the straight region along a third direction. The first direction, the second direction, and the third direction are not coplanar and intersect each other. For the wound electrode assembly, the straight region expands more in the second direction. Since the first region reinforces the area of ​​the first wall near the connection, the risk of fatigue cracking of the first wall near the connection due to the expansion of the electrode assembly can be effectively reduced.

[0032] In some embodiments, the electrode assembly is a stacked structure, and the flat region includes multiple positive electrode sheets and multiple negative electrode sheets, which are stacked along a first direction. For the stacked electrode assembly, the expansion amount of the electrode assembly in the stacking direction of the positive and negative electrode sheets is greater. Since the first region strengthens the area of ​​the first wall near the connection, the risk of fatigue cracking of the first wall near the connection due to the expansion of the electrode assembly can be effectively reduced.

[0033] Secondly, embodiments of this application provide an electrical device, including the battery device provided in any one of the embodiments of the first aspect. Attached Figure Description

[0034] 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.

[0035] Figure 1A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 Axonometric views of a battery device provided in some embodiments of this application;

[0037] Figure 3 for Figure 2 The battery assembly shown is an isometric view after the second housing has been removed.

[0038] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0039] Figure 5 Exploded views of a single battery cell provided in some embodiments of this application;

[0040] Figure 6 for Figure 5 The diagram shows the structure of a single battery cell;

[0041] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0042] Figure 8 This is a schematic diagram of the battery device provided in some embodiments of this application after removing the second housing;

[0043] Figure 9 for Figure 8 A partial enlarged view of point C in the middle;

[0044] Figure 10 for Figure 9 The diagram shows the positional relationship between the first wall and the thermal management components.

[0045] Figure 11 for Figure 8 A magnified view of a section at point D;

[0046] Figure 12 for Figure 11 The diagram shows the positional relationship between the first wall and the thermal management components.

[0047] Figure 13 This is a schematic diagram of the structure of a thermal management component provided in some embodiments of this application;

[0048] Figure 14 A diagram showing the positional relationship between the first wall and the thermal management component, provided for other embodiments of this application;

[0049] Figure 15 Partial views of a battery cell provided for other embodiments of this application;

[0050] Figure 16 for Figure 15 A magnified view of a section at point E in the middle;

[0051] Figure 17 A partial view of a battery cell provided for some embodiments of this application;

[0052] Figure 18 for Figure 17 A magnified view of a section at point F in the middle;

[0053] Figure 19 A partial view of a battery cell provided for some embodiments of this application;

[0054] Figure 20 for Figure 19 A magnified view of a section at point G in the middle;

[0055] Figure 21 Axonometric views of the housing provided for some embodiments of this application;

[0056] Figure 22 Axonometric views of electrode assemblies provided in some embodiments of this application;

[0057] Figure 23 for Figure 22 The diagram shows the structure of the electrode assembly.

[0058] Figure 24 Axonometric views of electrode assemblies provided for other embodiments of this application;

[0059] Figure 25 for Figure 24 The diagram shows the structure of the electrode assembly.

[0060] Icons: 1-Outer shell; 11-Housing shell; 111-First wall; 1111-First region; 11111-First protrusion; 11112-Second protrusion; 1112-Second region; 11121-First outer surface; 11122-First inner surface; 1113-Transition region; 112-Second wall; 12-End cap; 2-Electrode assembly; 21-Electrode tab; 22-Positive electrode; 23-Negative electrode; 24-Isolator; 25-Straight region; 26-Corner region; 3-Electrode terminal; 4-Current collector; 5-Pressure relief mechanism; 6-Insulating component; 7-Connecting part; 71-Connecting interface; 71a-First interface; 71b - Second interface; 711- First position; 712- Second position; 713- Third position; 10- Battery cell; 20- Housing; 201- First housing; 202- Second housing; 203- End plate; 2031- Exceeding area; 30- Thermal management component; 30a- First thermal management component; 30b- Second thermal management component; 301- First end; 302- Main body area; 303- Thinning area; 304- Shell body; 305- Separator; 100- Battery device; 200- Controller; 300- Motor; 1000- Vehicle; W- First interface; X- First direction; Z- Second direction; Y- Third direction. Detailed Implementation

[0061] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0063] 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.

[0064] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0065] 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.

[0066] In this application, "multiple" means two or more (including two).

[0067] 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.

[0068] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0069] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

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

[0071] 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.

[0072] 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.).

[0073] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells 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 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0074] 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.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0076] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0078] 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.

[0079] 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 negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0081] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0088] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0089] 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.

[0090] 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.

[0091] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0092] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0093] In some implementations, the electrode assembly is a stacked structure.

[0094] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0095] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0096] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0097] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0098] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0099] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0100] 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.

[0101] 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.

[0102] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0103] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0104] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0105] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0106] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0107] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0108] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0109] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0110] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0111] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0112] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0113] In a single battery cell, the cell may include a casing and electrode assemblies. The casing may include a housing and end caps. The housing has an opening. After the electrode assemblies are installed inside the housing, the opening can be closed by the end caps. The end caps can be welded to the housing. After the end caps are welded to the housing, the welded joint between the end caps and the housing wall forms a connection. The area of ​​the housing wall near the connection will form a heat-affected zone due to the high temperature of welding, and the strength of the portion of the housing wall in the heat-affected zone will be reduced. During the charge-discharge cycle of the battery cell, the electrode assemblies expand. The housing wall, subjected to the expansion force of the electrode assemblies, will deform. Over time, this can easily lead to fatigue cracking in the area of ​​the housing wall near the connection (heat-affected zone).

[0114] Therefore, to reduce the risk of fatigue cracking in the area of ​​the casing wall near the connection, the area of ​​the casing wall near the connection can be locally thickened. However, in battery devices, thermal management components are generally installed to manage the temperature of the individual battery cells. The thermal management components are thermally connected to the battery cells, and since the thermal management components cover the thickened area of ​​the casing wall, the large-area compression of the thickened area weakens the reinforcing effect of the thickened area and affects the service life of the individual battery cells.

[0115] In view of this, the present application provides a technical solution in which a battery device includes a battery cell and a plurality of thermal management components; the plurality of thermal management components are arranged along a first direction; the battery cell is disposed between two adjacent thermal management components along the first direction, and the battery cell includes a housing, an end cap, and an electrode assembly; the housing has an opening at at least one end along a second direction, and the housing includes a first wall that is thermally connected to the thermal management components, the first wall includes a first region and a second region arranged along the second direction, the thickness of the first region is greater than the thickness of the second region, and the second direction intersects the first direction; the end cap closes the opening, and the end cap is welded to the first wall to form a connection portion, and along the second direction, the first region is located between the connection portion and the second region; the electrode assembly is at least partially housed in the housing; wherein, along the second direction, the end of the thermal management component near the end cap is the first end, and at least a portion of the first region extends beyond the first end along the direction from the electrode assembly to the end cap.

[0116] In such a battery device, at least a portion of the first region extends beyond the first end of the thermal management component along the direction of the electrode assembly toward the end cap, reducing the overlap area between the thermal management component and the first region in the first direction, reducing the impact of the thermal management component on the first region, so that the first region can exert a greater reinforcing effect on the area of ​​the first wall near the connection, improving the service life of the battery cell, and thus effectively improving the service life of the battery device.

[0117] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0118] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0119] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0120] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0121] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0122] Please refer to Figure 2 and Figure 3 , Figure 2 Axonometric view of a battery device 100 provided in some embodiments of this application; Figure 3 for Figure 2 The battery assembly 100 shown is an isometric view after removing the second housing 202. The battery assembly 100 may include individual battery cells 10 and housing 20 for housing the individual battery cells 10.

[0123] The housing 20 has an enclosed space inside for accommodating the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which are interlocked. The first housing 201 and the second housing 202 can have various shapes, such as cuboids or cylinders. The first housing 201 can be a hollow structure open on one side, and the second housing 202 can also be a hollow structure open on one side. The open side of the second housing 202 interlocks with the open side of the first housing 201, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 201 can be a hollow structure open on one side, and the second housing 202 can be a plate-like structure, with the second housing 202 interlocked with the open side of the first housing 201, thus forming a housing 20 with a accommodating space.

[0124] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0125] In some embodiments, please refer to Figure 4 , Figure 4 for Figure 3 A partial enlarged view at point A. The battery device 100 may also include a thermal management component 30 for managing the temperature of the individual battery cells 10.

[0126] There can be multiple thermal management components 30, and one or more battery cells 10 are disposed between two adjacent thermal management components 30.

[0127] As an example, in Figure 4 In the illustrated embodiment, a plurality of thermal management components 30 are arranged along a first direction X. Along the first direction X, a row of battery cells 10 is arranged between two adjacent thermal management components 30. The thermal management components 30 extend along a third direction Y. A plurality of battery cells 10 in the row of battery cells 10 are arranged along the third direction Y. The first direction X, the second direction Z and the third direction Y are not coplanar and intersect each other.

[0128] Please refer to Figure 5-Figure 7 , Figure 5 Exploded views of a battery cell 10 provided in some embodiments of this application; Figure 6 for Figure 5 The schematic diagram of the battery cell 10 shown is shown. Figure 7 for Figure 6 A partial enlarged view at point B. The battery cell 10 may include a housing 1 and an electrode assembly 2, the electrode assembly 2 being housed within the housing 1.

[0129] In some embodiments, the housing 1 may include a housing 11 and an end cap 12. The housing 11 has an opening at at least one end along the second direction Z, and the end cap 12 corresponds to the opening one-to-one, closing the opening of the housing 11. Here, "closing" means covering or shutting off, which can be either sealed or unsealed.

[0130] The housing 11 is a component used to house the electrode assembly 2. The housing 11 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 11 can have various shapes, such as cylindrical or cuboid. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 2 can be partially or completely housed within the housing 11.

[0131] The end cap 12 and the housing 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 12 can be welded to the housing 11 to close the opening of the housing 11. The shape of the end cap 12 can be adapted to the shape of the housing 11; for example, if the housing 11 is a cuboid structure, the end cap 12 can be a rectangular plate structure adapted to the housing 11. The end cap 12 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The end cap 12 and the housing 11 can be made of the same or different materials.

[0132] In an embodiment where the housing 11 has an opening at one end, one end cap 12 may be provided accordingly. In an embodiment where the housing 11 has openings at both opposite ends, two end caps 12 may be provided accordingly. The two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define the receiving space.

[0133] In some embodiments, the battery cell 10 may further include electrode terminals 3, which are disposed on the housing 1 and are used for electrical connection with the tabs 21 of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminals 3 may be disposed on the housing 11 of the housing 1 or on the end cap 12 of the housing 1. The electrode terminals 3 and the tabs 21 may be directly connected, for example, by welding. Alternatively, the electrode terminals 3 and the tabs 21 may be indirectly connected, for example, through a current collector 4. The current collector 4 may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0134] In some embodiments, the battery cell 10 may further include a pressure relief mechanism 5, which may be disposed on the end cap 12 or the housing 11. The pressure relief mechanism 5 may be a pressure relief component installed on the housing 11 or the end cap 12, such as an explosion-proof plate or a safety valve. The pressure relief mechanism 5 may also be integrally formed with the end cap 12 or the housing 11. The pressure relief mechanism 5 may be provided with a pressure relief groove to split along the pressure relief groove when the battery cell 10 is depressurized. The pressure relief groove may be a groove extending along a closed trajectory, which may be a circular trajectory, a rectangular trajectory, etc.; the pressure relief groove may also be a groove extending along a non-closed trajectory, which may be an H-shaped trajectory, a Y-shaped trajectory, a V-shaped trajectory, a U-shaped trajectory, etc.

[0135] As an example, such as Figure 5-Figure 7 As shown, one end of the housing 11 forms an opening, and there is one end cap 12 in the housing 1, which closes one opening of the housing 11. The end cap 12 is provided with a pressure relief mechanism 5, and two electrode terminals 3 are provided on the end cap 12, which are a positive electrode terminal and a negative electrode terminal, respectively. The end of the electrode assembly 2 facing the end cap 12 has two tabs 21, which are a positive electrode tab and a negative electrode tab, respectively. The positive electrode terminal is connected to the positive electrode tab through a current collector 4, and the negative electrode terminal is connected to the negative electrode tab through another current collector 4. An insulating member 6 is provided on the side of the end cap 12 facing the electrode assembly 2, which is used to insulate and isolate the end cap 12 and the current collector 4.

[0136] Please refer to Figures 8-9 , Figure 8 A schematic diagram of the structure of the battery device 100 provided in some embodiments of this application after removing the second housing 202; Figure 9 for Figure 8 A partial enlarged view at point C. This application provides a battery device 100, including a battery cell 10 and a plurality of thermal management components 30. The plurality of thermal management components 30 are arranged along a first direction X. The battery cell 10 is disposed between two adjacent thermal management components 30 along the first direction X, and the battery cell 10 includes a housing 11 (…). Figure 5(shown in the diagram) end cap 12 and electrode assembly 2. The housing 11 has an opening at at least one end along the second direction Z. The housing 11 includes a first wall 111 thermally connected to the thermal management component 30. The first wall 111 includes a first region 1111 and a second region 1112 arranged along the second direction Z. The thickness of the first region 1111 is greater than the thickness of the second region 1112. The second direction Z intersects the first direction X. The end cap 12 closes the opening and is welded to the first wall 111 to form a connection portion 7. Along the second direction Z, the first region 1111 is located between the connection portion 7 and the second region 1112. The electrode assembly 2 is at least partially housed within the housing 11. Along the second direction Z, the end of the thermal management component 30 near the end cap 12 is a first end 301. At least a portion of the first region 1111 extends beyond the first end 301 in the direction from the electrode assembly 2 to the end cap 12.

[0137] The thermal management component 30 can be a heating component for heating the battery cell 10 or a cooling component for cooling the battery cell 10. The thermal management component 30 can extend along a third direction Y, where the first direction X, the second direction Z, and the third direction Y are not coplanar and intersect each other. Any two of the first direction X, the second direction Z, and the third direction Y can be arranged at acute, right, or obtuse angles. As an example, the thermal management component 30 is a water-cooled plate, and a flow channel for the heat exchange medium is formed inside the thermal management component 30. The thickness direction of the thermal management component 30 is parallel to the first direction X, and the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0138] Along the second direction Z, the thermal management component 30 has two opposing ends, with the end closer to the end cap 12 being the first end 301. It is understood that in embodiments where the housing 11 has openings at its opposing ends along the second direction Z, there are two end caps 12. Along the second direction Z, one end of the thermal management component 30 is close to one end cap 12, and the other end of the thermal management component 30 is close to the other end cap 12. Both ends of the thermal management component 30 are the first end 301.

[0139] One or more battery cells 10 can be arranged between two adjacent thermal management components 30. If multiple battery cells 10 are arranged between two adjacent thermal management components 30, the multiple battery cells 10 can be arranged in a row, and the battery cells 10 can be prism-shaped. The prism can be a triangular prism, a square prism, a pentagonal prism, a hexagonal prism, etc. The square prism can be a cuboid, a cube, etc.

[0140] The thermal management component 30 can be made of metal, such as copper, iron, aluminum, steel, or aluminum alloy. The thermal management component 30 is thermally connected to the first wall 111 of the housing 11. This can be achieved by direct contact or connection between the thermal management component 30 and the first wall 111, or by thermally connecting the thermal management component 30 to the first wall 111 through a thermally conductive component, such as thermally conductive adhesive or a metal plate.

[0141] The first wall 111 is the wall portion of the housing 11 facing the thermal management component 30, and the thickness direction of the first wall 111 is parallel to the first direction X. Along the first direction X, the housing 11 may include two opposing first walls 111, one first wall 111 being thermally connected to an adjacent thermal management component 30, and the other first wall 111 being thermally connected to another adjacent thermal management component 30.

[0142] The first wall 111 can be the wall with the largest outer surface area in the shell 11, or it can be a wall that is not the wall with the largest outer surface area in the shell 11. Taking the shell 11 as a cuboid as an example, the shell 11 can include two first walls 111 and two second walls 112. Figure 8 and Figure 9 (Not shown), two first walls 111 are arranged opposite each other along a first direction X, and two second walls 112 are arranged opposite each other along a third direction Y. The first wall 111 can be the wall with the largest outer surface area in the shell 11, so that the outer surface area of ​​the first wall 111 is greater than the outer surface area of ​​the second wall 112. Alternatively, the second wall 112 can be the wall with the largest outer surface area in the shell 11, so that the outer surface area of ​​the second wall 112 is greater than the outer surface area of ​​the first wall 111.

[0143] The first region 1111 can be a region where the thickness of the first wall 111 is increased, and the first region 1111 is thicker than the second region 1112. The first region 1111 can be directly connected to the connecting part 7 or indirectly connected. The first region 1111 can be a structure of equal thickness or a structure of unequal thickness; the second region 1112 can be a structure of equal thickness or a structure of unequal thickness. If at least one of the first region 1111 and the second region 1112 is a structure of unequal thickness, the maximum thickness of the second region 1112 can be less than or equal to the minimum thickness of the first region 1111, so that the thickness of the first region 1111 is greater than the thickness of the second region 1112. As an example, the first region 1111 is a structure of unequal thickness, the first region 1111 includes a first part and a second part, the thickness of the second part is less than the thickness of the first part, the second part is located at the first part and the second region 1112, and connects the first part and the second region 1112, and the thickness of the second part decreases in the direction from the first part to the second region 1112.

[0144] In an embodiment where there is one end cap 12 in the housing 1, there is one first region 1111 in the first wall 111; in an embodiment where there are two end caps 12 in the housing 1, there are two first regions 1111 in the first wall 111, and along the second direction Z, the second region 1112 is located between the two first regions 1111.

[0145] The second region 1112 has a first outer surface 11121 facing the exterior of the housing 11. Figure 7 (shown in the figure) and the first inner surface 11122 facing the interior of the housing 11 ( Figure 7 (As shown in the figure), a portion of the first region 1111 may protrude from the first outer surface 11121, with the inner surface of the first region 1111 coplanar with the first inner surface 11122; or a portion of the first region 1111 may protrude from the first inner surface 11122, with the outer surface of the first region 1111 flush with the first outer surface 11121; or a portion of the first region 1111 may protrude from the first outer surface 11121, with another portion of the first region 1111 protruding from the first inner surface 11122.

[0146] The electrode assembly 2 may be partially or entirely located within the housing 11. The electrode assembly 2 is situated within the receiving space defined by the housing 11 and the end cap 12. The electrode assembly 2 may be a stacked structure or a wound structure. There may be one or more electrode assemblies 2 within the housing 11. If there are multiple electrode assemblies 2, they may be stacked, for example, multiple electrode assemblies 2 may be stacked along a first direction X.

[0147] The end cap 12 can be welded to the housing 11 to achieve fixation and sealing between the end cap 12 and the housing 11. The connecting part 7 is the weld mark formed after the end cap 12 and the first wall 111 of the housing 11 are welded together. The connecting part 7 can be formed by welding the end cap 12 and the first wall 111 together. The connecting part 7 can correspond one-to-one with the first area 1111 of the first wall 111. A part of the connecting part 7 can be formed on the end cap 12 and another part can be formed on the first wall 111. The first wall 111 and the end cap 12 can form the connecting part 7 by seam welding or by through welding.

[0148] In the second direction Z, along the direction from the electrode assembly 2 to the end cap 12, a portion of the first region 1111 may extend beyond the first end 301, such that in a plane perpendicular to the first direction X, a portion of the orthographic projection of the first region 1111 overlaps with a portion of the orthographic projection of the thermal management component 30; or the entire first region 1111 may extend beyond the first end 301, such that in a plane perpendicular to the first direction X, the orthographic projection of the first region 1111 and the orthographic projection of the thermal management component 30 do not overlap, and are spaced apart along the second direction Z.

[0149] In this embodiment, the thickness of the first region 1111 is greater than the thickness of the second region 1112, and the first region 1111 is located between the connecting portion 7 and the second region 1112 along the second direction Z. This makes the thicker first region 1111 closer to the connecting portion 7 than the second region 1112. The first region 1111 strengthens the area of ​​the first wall 111 near the connecting portion 7, thereby reducing the risk of fatigue cracking in the area of ​​the first wall 111 near the connecting portion 7. In addition, since at least a portion of the first region 1111 extends beyond the first end 301 of the thermal management component 30 along the direction from the electrode assembly 2 to the end cap 12, the overlap area between the thermal management component 30 and the first region 1111 in the first direction X is reduced, thus reducing the influence of the thermal management component 30 on the first region 1111. This allows the first region 1111 to exert a greater strengthening effect on the area of ​​the first wall 111 near the connecting portion 7, improving the service life of the battery cell 10 and thus effectively improving the service life of the battery device 100.

[0150] In some embodiments, please refer to Figure 10 , Figure 10 for Figure 9 The diagram shows the positional relationship between the first wall 111 and the thermal management component 30. Along the first direction X, the second region 1112 has a first outer surface 11121 facing the exterior of the housing 11. The first outer surface 11121 directly or indirectly abuts against the thermal management component 30. The first region 1111 includes a first protrusion 11111 protruding from the first outer surface 11121. At least a portion of the first protrusion 11111 extends beyond the first end 301 in the direction from the electrode assembly 2 to the end cap 12.

[0151] The second region 1112 has a first inner surface 11122 facing the interior of the housing 11, and the first inner surface 11122 and the first outer surface 11121 are disposed opposite to each other. The first outer surface 11121 and the first inner surface 11122 can be planar or curved. The thermal management component 30 can be attached to the first outer surface 11121 to achieve direct contact between the first outer surface 11121 and the thermal management component 30. The thermal management component 30 can also be indirectly contacted with the first outer surface 11121 through a heat-conducting component.

[0152] The first protrusion 11111 is the portion of the first region 1111 that protrudes from the first outer surface 11121. The first protrusion 11111 can be of uniform thickness or of non-uniform thickness. A portion of the first protrusion 11111 may extend beyond the first end 301 in the direction from the electrode assembly 2 to the end cover 12, or the entire first protrusion 11111 may extend beyond the first end 301 in the direction from the electrode assembly 2 to the end cover 12. For example, the first protrusion 11111 and the thermal management component 30 are spaced apart along the second direction Z.

[0153] As an example, in Figure 10 In the illustrated embodiment, the inner surface of the first region 1111 is coplanar with the first inner surface 11122.

[0154] In this embodiment, at least a portion of the first protrusion 11111 is arranged with the thermal management component 30 along the second direction Z, so that the first protrusion 11111 effectively utilizes the space of the first end 301 of the thermal management component 30, reducing the total size of the battery cell 10 and the thermal management component 30 along the first direction X, making the structure of the battery cell 10 and the thermal management component 30 more compact, improving space utilization, and helping to improve the volumetric energy density of the battery device 100.

[0155] In some embodiments, in a projection plane perpendicular to the first direction X, the orthographic projection of the first protrusion 11111 does not overlap with the orthographic projection of the thermal management component 30.

[0156] It is understandable that, in the projection plane perpendicular to the first direction X, the orthographic projection of the first protrusion 11111 and the orthographic projection of the thermal management component 30 do not overlap, and the first protrusion 11111 and the thermal management component 30 are spaced apart along the second direction Z.

[0157] In this embodiment, in the projection plane perpendicular to the first direction X, the orthographic projection of the first protrusion 11111 does not overlap with the orthographic projection of the thermal management component 30. On the one hand, this reduces the risk of interference between the first protrusion 11111 and the thermal management component 30, making the structure of the battery cell 10 and the thermal management component 30 more compact. On the other hand, it reduces the risk of the thermal management component 30 squeezing the first protrusion 11111, thus reducing the impact of the thermal management component 30 on the first region 1111.

[0158] In some embodiments, please continue to refer to Figure 9 and Figure 10 The battery device 100 includes a plurality of battery cells 10 arranged along a first direction X. A thermal management component 30 is disposed between two adjacent battery cells 10 along the first direction X. The thermal management component 30 located between two adjacent battery cells 10 is a first thermal management component 30a. The maximum thickness of the first thermal management component 30a is D1, and the maximum thickness of the first protrusion 11111 is L1, where L1≤D1 / 2.

[0159] The first thermal management component 30a can be of uniform thickness or non-uniform thickness. The thickness direction of the first thermal management component 30a is parallel to the thickness direction of the first protrusion 11111 in the first direction X. The thickness of the thickest part of the first thermal management component 30a is its maximum thickness. A flow channel for the flow of the heat exchange medium can be formed inside the first thermal management component 30a. The thickness of the thickest part of the first protrusion 11111 is its maximum thickness. As an example, along the first direction X, the maximum distance between the surface of the first protrusion 11111 facing away from the first outer surface 11121 and the first outer surface 11121 is equal to the maximum thickness of the first protrusion 11111.

[0160] D1 / L1≥2, where D1 / L1 can take any one of the point values ​​from 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., or any range between the two.

[0161] In this embodiment, L1≤D1 / 2, ensuring that the sum of the maximum thicknesses of the first protrusions 11111 on both sides of the first thermal management component 30a does not exceed the maximum thickness of the first thermal management component 30a. This reduces the risk of mutual interference between the first protrusions 11111 on both sides of the first thermal management component 30a, allowing the first thermal management component 30a to be closer to the first outer surface 11121 of the second region 1112 of the adjacent battery cell 10, thereby improving the heat exchange efficiency between the first thermal management component 30a and the adjacent battery cell 10.

[0162] In some embodiments, please refer to Figure 11 and Figure 12 , Figure 11 for Figure 8 A magnified view of a section at point D; Figure 12 for Figure 11 The diagram shows the positional relationship between the first wall 111 and the thermal management component 30. The battery device 100 includes an end plate 203 and a plurality of battery cells 10 arranged along a first direction X. A thermal management component 30 is disposed between two adjacent battery cells 10 along the first direction X. The plurality of battery cells 10 are located on the same side of the end plate 203. The thermal management component 30 located between the end plate 203 and the battery cell 10 closest to the end plate 203 is a second thermal management component 30b. The maximum thickness of the second thermal management component 30b is D2, and the maximum thickness of the first protrusion 11111 is L1, where L1 ≤ D2.

[0163] The battery device 100 may have one or more end plates 203. Taking two end plates 203 as an example, multiple battery cells 10 and multiple thermal management components 30 are sandwiched between the two end plates 203, and the battery cells 10 and thermal management components 30 are alternately arranged along the first direction X. In embodiments where the battery device 100 includes a housing 20, the end plate 203 may be a wall in the housing 20, or it may be a beam fixed inside the housing 20.

[0164] Among the multiple thermal management components 30, the thermal management component 30 closest to the end plate 203 is the second thermal management component 30b, and the second thermal management component 30b corresponds one-to-one with the end plate 203. It can be understood that the second thermal management component 30b is the thermal management component 30 adjacent to the end plate 203 among the multiple thermal management components 30.

[0165] The second heat management component 30b can be of uniform thickness or non-uniform thickness. The thickness direction of the second heat management component 30b is parallel to the thickness direction of the first protrusion 11111 and is in the first direction X. The thickness of the thickest part of the second heat management component 30b is the maximum thickness of the first heat management component 30a. A flow channel for the flow of the heat exchange medium can be formed inside the second heat management component 30b.

[0166] D2 / L1≥1, where D2 / L1 can take any one of the point values ​​from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., or any range between two values. It can be D2>D1, D2=D1, or D2<D1.

[0167] In this embodiment, L1≤D2 reduces the risk of interference between the first protrusion 11111 and the end plate 203, allowing the second thermal management component 30b to be closer to the first outer surface 11121 of the second region 1112 of the adjacent battery cell 10, thereby improving the heat exchange efficiency between the second thermal management component 30b and the adjacent battery cell 10.

[0168] In some embodiments, along the first direction X, the thermal management component 30 located between two adjacent battery cells 10 is a first thermal management component 30a, and the maximum thickness of the first thermal management component 30a is D1, where 0.3D1≤D2≤0.7D1.

[0169] 0.3≤D2 / D1≤0.7, where D2 / D1 can take any one of the following point values ​​or any range between two values: 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7.

[0170] The first thermal management component 30a needs to exchange heat with the battery cells 10 on both sides, while the second thermal management component 30b only needs to exchange heat with the battery cell 10 on one side. 0.3D1≤D2≤0.7D1. This allows the second thermal management component 30b to meet the thermal management requirements for the battery cell 10 on one side, while reducing the amount of material used in the second thermal management component 30b and the space occupied by the second thermal management component 30b in the first direction X, thus freeing up more space for the battery cell 10 and improving the volumetric energy density of the battery device 100.

[0171] In some embodiments, please continue to refer to Figure 11 and Figure 12 The end plate 203 includes an extension region 2031 extending beyond the first end 301 in the direction from the electrode assembly 2 to the end cap 12. In a projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of the extension region 2031 overlaps with at least a portion of the orthographic projection of the first protrusion 11111.

[0172] The extended area 2031 is the portion of the end plate 203 that extends beyond the first end 301 along the direction from the electrode assembly 2 to the end cover 12.

[0173] In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the area 2031 may overlap with a portion of the orthographic projection of the first protrusion 11111, a portion of the orthographic projection of the area 2031 may overlap with the entire orthographic projection of the first protrusion 11111, the entire orthographic projection of the area 2031 may overlap with a portion of the orthographic projection of the first protrusion 11111, or the entire orthographic projection of the area 2031 may overlap with the entire orthographic projection of the first protrusion 11111.

[0174] As an example, in Figure 11 In the illustrated embodiment, along the first direction X, the extended region 2031 is disposed opposite to the first protrusion 11111, and a gap exists between the extended region 2031 and the first protrusion 11111. In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the extended region 2031 overlaps with a portion of the orthographic projection of the first protrusion 11111.

[0175] In this embodiment, in the projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of the extended region 2031 overlaps with at least a portion of the orthographic projection of the first protrusion 11111, ensuring that the extended region 2031 has sufficient size in the second direction Z, thereby improving the constraint capability of the end plate 203 on the second thermal management component 30b. Furthermore, when the battery cell 10 expands along the first direction X, the second thermal management component 30b is compressed by the pressure of the first wall 111, which may cause the internal flow channels of the second thermal management component 30b to close due to compression. Since at least a portion of the orthographic projection of the extended region 2031 overlaps with at least a portion of the orthographic projection of the first protrusion 11111, during the compression process of the second thermal management component 30b by the battery cell 10 and the end plate 203, the first protrusion 11111 can abut against the end plate 203, reducing the risk of further compression of the second thermal management component 30b leading to flow channel closure.

[0176] In some embodiments, please refer to Figure 12 and Figure 13 , Figure 13 This is a schematic diagram of the structure of a thermal management component 30 provided in some embodiments of this application. The thermal management component 30 includes a main body region 302 and a thinning region 303. The thickness of the thinning region 303 is less than the thickness of the main body region 302. The main body region 302 is thermally connected to the second region 1112. Along the second direction Z, at least one end of the main body region 302 is provided with a thinning region 303. The end of the thinning region 303 near the connecting portion 7 that is away from the main body region 302 is the first end 301.

[0177] Along the second direction Z, the main body region 302 may have a thinning region 303 at only one end, or it may have thinning regions 303 at both ends. It is understood that in embodiments where there are two end caps 12 in the outer casing 1, along the second direction Z, both ends of the first wall 111 are provided with connecting portions 7, and both ends of the main body region 302 may have thinning regions 303, with the ends of the two thinning regions 303 furthest from the main body region 302 being the first end 301.

[0178] The main body region 302 can be a structure of uniform thickness or a structure of non-uniform thickness; the thinning region 303 can also be a structure of uniform thickness or a structure of non-uniform thickness. If at least one of the main body region 302 and the thinning region 303 is a structure of non-uniform thickness, the maximum thickness of the thinning region 303 can be less than or equal to the minimum thickness of the main body region 302, so that the thickness of the thinning region 303 is less than the thickness of the main body region 302. The thickness direction of the main body region 302 and the thickness direction of the thinning region 303 are parallel to the first direction X.

[0179] The main body region 302 and the second region 1112 are thermally connected. This can be achieved by direct contact or connection between the main body region 302 and the second region 1112, or by thermally connecting the main body region 302 and the second region 1112 through a thermally conductive component.

[0180] As an example, the main body region 302 is in contact with the first outer surface 11121 of the second region 1112 to achieve a thermally conductive connection between the main body region 302 and the second region 1112.

[0181] In this embodiment, the thickness of the thinning region 303 is less than the thickness of the main body region 302. The thinning region 303 can further reduce the influence of the thermal management component 30 on the first region 1111.

[0182] In some embodiments, please continue to refer to Figure 13 The thickness of the thinning region 303 decreases along the direction from the main region 302 to the thinning region 303.

[0183] The direction in which the main body region 302 points to the thinning region 303 is the same as the direction in which the electrode assembly 2 points to the end cap 12.

[0184] As an example, the thermal management component 30 includes a shell body 304 and a plurality of partitions 305 disposed inside the shell body 304. The partitions 305 are spaced apart and divide the internal space of the shell body 304 into a plurality of subspaces, which are connected to form flow channels inside the thermal management component 30. The partitions 305 are inclined and, in a cross section parallel to the first direction X and the second direction Z, the partitions 305 are set at an acute angle to the first direction X. The two end regions of the shell body 304 along the second direction Z are located in the thinning region 303, and the middle region of the shell body 304 and the plurality of partitions 305 are located in the main body region 302. The first protrusion 11111 ( Figure 12 The thickness of the portion shown in the diagram is greater than the wall thickness of the shell body 304. For example, the first protrusion 11111 ( Figure 12 The thickness (shown in the figure) is more than twice the wall thickness of the shell body 304.

[0185] In this embodiment, the thickness of the thinning region 303 decreases along the direction from the main body region 302 to the thinning region 303. This structure of the thinning region 303 is simple, which allows a gap to be formed between the weak region and the first wall 111, reducing the risk of compression between the weak region and the first region 1111, and further reducing the impact of the thermal management component 30 on the first region 1111.

[0186] In some embodiments, please continue to refer to Figure 12 Along the first direction X, there is a gap between the thinning region 303 and the first wall 111.

[0187] As an example, there is a gap between the thinning zone 303 and the second zone 1112 of the first wall 111.

[0188] In this embodiment, there is a gap between the thinning region 303 and the first wall 111, which further reduces the influence of the thermal management component 30 on the first region 1111.

[0189] In some embodiments, the orthographic projection of the first region 1111 does not overlap with the orthographic projection of the thermal management component 30 in a projection plane perpendicular to the first direction X.

[0190] It is understood that, in a projection plane perpendicular to the first direction X, the orthographic projection of the first region 1111 and the orthographic projection of the thermal management component 30 do not overlap. In an embodiment where the first region 1111 has a first protrusion 11111, in a projection plane perpendicular to the first direction X, the orthographic projection of the first protrusion 11111 does not overlap with the orthographic projection of the thermal management component 30.

[0191] In this embodiment, the orthographic projection of the first region 1111 does not overlap with the orthographic projection of the thermal management component 30 in the projection plane perpendicular to the first direction X. This reduces the risk of compression between the thermal management component 30 and the first region 1111, and further reduces the impact of the thermal management component 30 on the first region 1111.

[0192] In some embodiments, please refer to Figure 14 , Figure 14 This diagram illustrates the positional relationship between the first wall 111 and the thermal management component 30, as provided in other embodiments of this application. Along the first direction X, the second region 1112 has a first outer surface 11121 facing the exterior of the housing 11 and a first inner surface 11122 facing the interior of the housing 11. The first outer surface 11121 directly or indirectly abuts against the thermal management component 30. A portion of the first region 1111 protrudes from the first outer surface 11121, and another portion of the first region 1111 protrudes from the first inner surface 11122.

[0193] The thickness of the portion of the first region 1111 protruding from the first outer surface 11121 may be greater than the thickness of the portion of the first region 1111 protruding from the first inner surface 11122, or the thickness of the portion of the first region 1111 protruding from the first outer surface 11121 may be equal to the thickness of the portion of the first region 1111 protruding from the first inner surface 11122, or the thickness of the portion of the first region 1111 protruding from the first outer surface 11121 may be less than the thickness of the portion of the first region 1111 protruding from the first inner surface 11122.

[0194] In this embodiment, the first outer surface 11121 directly or indirectly abuts against the thermal management component 30, enabling better heat exchange between the battery cell 10 and the thermal management component 30 and improving the heat exchange efficiency between them. With a fixed thickness of the first region 1111, a portion of the first region 1111 protrudes from the first outer surface 11121 and the first inner surface 11122, ensuring that the thickness of the portion of the first region 1111 protruding from the first outer surface 11121 and the thickness of the portion protruding from the first inner surface 11122 are not excessive, thus reducing the occupancy of the first region 1111 on the internal or external space of the housing 11.

[0195] In some embodiments, please continue to refer to Figure 14 The first region 1111 includes a first protrusion 11111 protruding from the first outer surface 11121 and a second protrusion 11112 protruding from the first inner surface 11122. Along the first direction X, the maximum thickness of the first protrusion 11111 is L1, and the maximum thickness of the second protrusion 11112 is L2, where L1 > L2.

[0196] The first protrusion 11111 is the portion of the first region 1111 that protrudes from the first outer surface 11121, and the second protrusion 11112 is the portion of the first region 1111 that protrudes from the first inner surface 11122. The first protrusion 11111 can be of uniform thickness or of non-uniform thickness. The second protrusion 11112 can also be of uniform thickness or of non-uniform thickness. The thickness of the thickest portion of the first protrusion 11111 is the maximum thickness of the first protrusion 11111, and the thickness of the thickest portion of the second protrusion 11112 is the maximum thickness of the second protrusion 11112. As an example, along the first direction X, the maximum distance between the surface of the first protrusion 11111 facing away from the first outer surface 11121 and the first outer surface 11121 is equal to the maximum thickness of the first protrusion 11111, and the maximum distance between the surface of the second protrusion 11112 facing away from the first inner surface 11122 and the first inner surface 11122 is equal to the maximum thickness of the second protrusion 11112.

[0197] If L1 / L2 > 1, then L1 / L2 can take values ​​of 1.1, 1.3, 1.5, 1.7, 1.9, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5.

[0198] The value of any one of 8, 8.5, 9, 9.5, 10, etc., or the range between any two.

[0199] In this embodiment, the first protrusion 11111 has a larger maximum thickness and the second protrusion 11112 has a smaller maximum thickness. This allows the first protrusion 11111 to make full use of the space at the first end 301 of the thermal management component 30, while also reducing the space occupied by the second protrusion 11112 on the internal space of the housing 11, thus freeing up more space for the electrode assembly 2.

[0200] In some embodiments, 0.05mm ≤ L1 ≤ 1.2mm.

[0201] L1 can take any one of the following point values ​​or a range between any two: 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm.

[0202] In some embodiments, 0.05mm ≤ L2 ≤ 1mm.

[0203] L2 can take any one of the following point values ​​or any range between two values: 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm.

[0204] In some embodiments, please refer to Figure 15 and Figure 16 , Figure 15 Partial view of a battery cell 10 provided for other embodiments of this application; Figure 16 for Figure 15 A partial enlarged view at point E. The first wall 111 also includes a transition region 1113, which is connected to the end of the first region 1111 away from the second region 1112 along the second direction Z. The transition region 1113 is connected to the connecting part 7, and the connection position of the transition region 1113 and the connecting part 7 forms a connecting interface 71. The connecting interface 71 has a first position 711 that is closest to the first region 1111 along the second direction Z. The first position 711 is located at the end of the first region 1111 away from the second region 1112 along the second direction Z.

[0205] The transition zone 1113 may be the portion of the first wall 111 connecting the connecting portion 7 and the first zone 1111. The transition zone 1113 may be a structure of uniform thickness or a structure of non-uniform thickness. The thickness of the transition zone 1113 may be less than the thickness of the first zone 1111, and the thickness direction of the transition zone 1113 and the thickness direction of the first zone 1111 are both parallel to the first direction X. As an example, in Figure 15 and Figure 16In the illustrated embodiment, the thickness of the transition region 1113 gradually decreases along the direction from the second region 1112 to the first region 1111.

[0206] The hardness of the transition zone 1113 may be equal to or unequal to the hardness of the first zone 1111. The hardness of the transition zone 1113 may be equal to or unequal to the hardness of the connecting portion 7.

[0207] The connection interface 71 is formed at the connection position between the transition area 1113 and the connection part 7, and the transition area 1113 and the connection part 7 are separated at the connection interface 71. The connection interface 71 can be a plane or a curved surface.

[0208] The first zone 1111 and the transition zone 1113 are separated by the first interface W, which is a virtual plane. The first interface W passes through the first position 711 and is perpendicular to the second direction Z. The transition zone 1113 and the connecting part 7 are located above the first interface W, and the first zone 1111 is located below the first interface W.

[0209] In this embodiment, the transition area 1113 and the connecting part 7 are connected to form a connection interface 71, so that the transition area 1113 and the connecting part 7 have a sufficiently large contact area, which improves the firmness of the first wall 111 and the end cap 12 after welding.

[0210] In some embodiments, at least a portion of the connection interface 71 extends at an angle relative to the first direction X.

[0211] The connection interface 71 can extend at an angle relative to the first direction X as a whole, or it can extend at an angle relative to the first direction X in a partial manner. It is understood that the extension direction of the portion of the connection interface 71 that extends at an angle relative to the first direction X is not parallel to the first direction X.

[0212] After the end cap 12 and the first wall 111 are welded, the connecting portion 7 shrinks as it solidifies, generating tensile stress on the transition zone 1113. When the first wall 111 is subjected to the expansion force of the electrode assembly 2, it deforms, and the transition zone 1113 generates tensile stress on the connecting portion 7. Since the connecting interface 71 extends at least partially at an angle relative to the first direction X, the tensile stress generated by the connecting portion 7 due to shrinkage on the transition zone 1113 near the portion of the connecting interface 71 that extends at an angle relative to the first direction X (the direction of the tensile stress is approximately perpendicular to the portion of the connecting interface 71 that extends at an angle relative to the first direction X) is not in the same direction as the tensile stress generated by the transition zone 1113 due to deformation of the first wall 111 on the connecting portion 7 (the direction of the tensile stress is approximately parallel to the second direction Z). This reduces the risk of fatigue cracking in the area of ​​the transition zone 1113 near the connecting interface 71.

[0213] In some embodiments, please continue to refer to Figure 16 The connection interface 71 includes a first interface 71a, which extends obliquely from a first position 711 toward the end cap 12. Along the first direction X, at least a portion of the transition region 1113 is located between the first interface 71a and the end cap 12.

[0214] It is understandable that the first interface 71a extends at an angle relative to the first direction X. The first interface 71a can be a plane or a curved surface.

[0215] The first position 711 is the lowest position of the first interface 71a (the position closest to the first area 1111). The first interface 71a extends obliquely from the first position 711 toward the end cover 12, that is, the first interface 71a extends obliquely upward from the first position 711 toward the end cover 12.

[0216] Along the first direction X, the transition region 1113 can be entirely located between the first interface 71a and the end cap 12, or only a portion of the transition region 1113 can be located between the first interface 71a and the end cap 12.

[0217] In this embodiment, at least a portion of the transition region 1113 is located between the first interface 71a and the end cap 12 along the first direction X. The connecting portion 7 protects the transition region 1113. When the first wall 111 is subjected to the expansion force of the electrode assembly 2, the deformation of the transition region 1113 during the force process is blocked by the connecting portion 7, which reduces the risk of fatigue cracking in the area of ​​the transition region 1113 near the first interface 71a.

[0218] In some embodiments, please continue to refer to Figure 16 The first interface 71a is connected to the outer surface of the first region 1111 at the first position 711.

[0219] As an example, the first interface 71a intersects the outer surface of the first region 1111 at a first line, which extends along a third direction Y, and the location of the first line is the first position 711. The first interface 71a is connected to the inner surface of the transition region 1113 at a second position 712 along a second direction Z, and the second position 712 is farther away from the first region 1111 than the first position 711. The transition region 1113 is approximately triangular in shape.

[0220] In this embodiment, the first interface 71a is connected to the outer surface of the first region 1111 at the first position 711, so that the first region 1111 and the connecting part 7 are closer along the second direction Z, which further reduces the risk of fatigue cracking of the area of ​​the first wall 111 near the connecting part 7 due to the expansion of the electrode assembly 2.

[0221] In some embodiments, please refer to Figure 17 and Figure 18 , Figure 17A partial view of a battery cell 10 provided for some embodiments of this application; Figure 18 for Figure 17 A partial enlarged view at point F. The connection interface 71 includes a second interface 71b, which extends obliquely from the first position 711 toward the end cap 12. Along the first direction X, at least a portion of the transition region 1113 is located on the side of the second interface 71b away from the end cap 12.

[0222] Understandably, the second interface 71b extends at an angle relative to the first direction X. The second interface 71b can be planar or curved. Along the first direction X, at least a portion of the connecting portion 7 is located between the second interface 71b and the end cap 12.

[0223] The first position 711 is the lowest position of the second interface 71b (the position closest to the first area 1111). The second interface 71b extends obliquely from the first position 711 in a direction away from the end cover 12, that is, the second interface 71b extends obliquely upward from the first position 711 in a direction away from the end cover 12.

[0224] Along the first direction X, the transition region 1113 can be entirely located on the side of the second interface 71b away from the end cover 12, or the transition region 1113 can be only partially located on the side of the second interface 71b away from the end cover 12.

[0225] In this embodiment, at least a portion of the transition region 1113 is located on the side of the second interface 71b away from the end cap 12 along the first direction X, so that the transition region 1113 restricts the connection portion 7 and reduces the risk of the connection portion 7 falling off.

[0226] In some embodiments, please continue to refer to Figure 18 The second interface 71b is connected to the inner surface of the first region 1111 at the first position 711.

[0227] As an example, the second interface 71b intersects the inner surface of the first region 1111 at a second line, which extends along a third direction Y, and the location of the second line is the first position 711. The second interface 71b is connected to the outer surface of the transition region 1113 at a third position 713, along a second direction Z. The third position 713 is farther away from the first region 1111 than the first position 711. The transition region 1113 is approximately triangular in shape.

[0228] In this embodiment, the second interface 71b is connected to the inner surface of the first region 1111 at the first position 711, making the first region 1111 and the connecting part 7 closer along the first direction X, further reducing the risk of fatigue cracking of the area of ​​the first wall 111 near the connecting part 7 due to the expansion of the electrode assembly 2.

[0229] In some embodiments, please refer to Figure 19 and Figure 20 , Figure 19 A partial view of a battery cell 10 provided for some embodiments of this application; Figure 20 for Figure 19 A partial enlarged view of point G. The connection interface 71 includes a first interface 71a and a second interface 71b. The first interface 71a extends obliquely from the first position 711 toward the end cap 12, and the second interface 71b extends obliquely from the first position 711 toward the end cap 12. Along the first direction X, a portion of the transition region 1113 is located between the first interface 71a and the end cap 12, and another portion of the transition region 1113 is located on the side of the second interface 71b away from the end cap 12.

[0230] As an example, the first interface 71a is connected to the inner surface of the transition region 1113 at the second position 712, and the second interface 71b is connected to the outer surface of the transition region 1113 at the third position 713.

[0231] In some embodiments, the Vickers hardness of the transition region 1113 is less than the Vickers hardness of the second region 1112; and / or, the Vickers hardness of the transition region 1113 is less than the Vickers hardness of the connecting portion 7.

[0232] As an example, the Vickers hardness of the second zone 1112 is less than that of the connecting part 7.

[0233] If the Vickers hardness of the transition zone 1113 is less than that of the second zone 1112, the transition zone 1113, with its lower Vickers hardness, connects to the connecting portion 7. This alleviates the rigid tension between the first wall 111 and the connecting portion 7 when the first wall 111 deforms, reducing the risk of separation between the first wall 111 and the connecting portion 7. Conversely, if the Vickers hardness of the transition zone 1113 is less than that of the connecting portion 7, the transition zone 1113 is more prone to deformation than the connecting portion 7. This also alleviates the rigid tension between the first wall 111 and the connecting portion 7 when the first wall 111 deforms, reducing the risk of separation between the first wall 111 and the connecting portion 7.

[0234] In some embodiments, at least a portion of the Vickers hardness of the first region 1111 is less than the Vickers hardness of the second region 1112.

[0235] It can be that the Vickers hardness of the entire first zone 1111 is less than the Vickers hardness of the second zone 1112, or it can be that only a portion of the Vickers hardness of the first zone 1111 is less than the Vickers hardness of the second zone 1112.

[0236] As an example, the Vickers hardness of a portion of the first zone 1111 is less than that of the second zone 1112, the Vickers hardness of another portion of the first zone 1111 is equal to that of the second zone 1112, and the portion of the first zone 1111 with the same Vickers hardness as the second zone 1112 is directly connected to the second zone 1112.

[0237] In this embodiment, when the second region 1112 deforms due to the expansion force of the electrode assembly 2, the area in the first region 1111 with a smaller Vickers hardness than the second region 1112 can reduce the impact of the deformation of the second region 1112 on the area of ​​the first wall 111 near the connection part 7, thereby reducing the risk of fatigue cracking of the area of ​​the first wall 111 near the connection part 7 due to the expansion of the electrode assembly 2.

[0238] In some embodiments, please refer to Figures 21-25 , Figure 21 Axonometric view of housing 11 provided for some embodiments of this application; Figure 22 Axonometric view of electrode assembly 2 provided in some embodiments of this application; Figure 23 for Figure 22 The diagram shows the structure of electrode assembly 2. Figure 24 Axonometric view of electrode assembly 2 provided in other embodiments of this application; Figure 25 for Figure 24 The diagram shows the structure of the electrode assembly 2. The electrode assembly 2 includes a positive electrode 22 and a negative electrode 23. At least a portion of the positive electrode 22 and at least a portion of the negative electrode 23 are stacked along the first direction X. The first wall 111 is the wall with the largest outer surface area in the housing 11.

[0239] It should be noted that the first wall 111 is the wall with the largest outer surface area in the shell 11, but this does not limit the shell 11 to having only one first wall 111. As an example, taking the shell 11 as a cuboid, the shell 11 may include two first walls 111 and two second walls 112. The two first walls 111 are arranged opposite each other along the first direction X, and the two second walls 112 are arranged opposite each other along the third direction Y. The outer surface area of ​​the first wall 111 is larger than the outer surface area of ​​the second wall 112.

[0240] In this embodiment, the first wall 111 is the wall with the largest outer surface area in the housing 11, so that the thermal management component 30 is thermally connected to the wall with the largest outer surface area in the housing 11, which can improve the heat exchange efficiency between the thermal management component 30 and the battery cell 10, and realize rapid cooling or heating of the battery cell 10.

[0241] Although the thermally conductive connection between the wall with the largest outer surface area in the housing 11 (the first wall 111) and the thermal management component 30 can improve the heat exchange efficiency between the thermal management component 30 and the battery cell 10, the electrode assembly 2 expands significantly along the first direction X during cycling because at least a portion of the positive electrode 22 and at least a portion of the negative electrode 23 are stacked along the first direction X. This makes the first region 1111 of the first wall 111 more susceptible to the influence of the thermal management component 30. In this embodiment, however, at least a portion of the first region 1111 extends beyond the first end 301 along the direction from the electrode assembly 2 to the end cap 12, effectively reducing the influence of the thermal management component 30 on the first region 1111.

[0242] In some embodiments, please refer to Figures 22-25 The electrode assembly 2 has a flat region 25, and the portion of the positive electrode 22 located in the flat region 25 and the portion of the negative electrode 23 located in the flat region 25 are stacked along the first direction X.

[0243] The flat region 25 is the flat portion of the electrode assembly 2. The portion of the positive electrode 22 located in the flat region 25 is approximately flat, and the portion of the negative electrode 23 located in the flat region 25 is also approximately flat. As an example, both the portions of the positive electrode 22 and the negative electrode 23 located in the flat region 25 are flat plate structures. If the electrode assembly 2 is a wound structure, it is a wound electrode assembly, and a portion of the electrode assembly 2 may be the flat region 25; if the electrode assembly 2 is a stacked structure, it is a stacked electrode assembly, and the entire electrode assembly 2 may be the flat region 25. The first direction X is the stacking direction of the portions of the positive electrode 22 and the negative electrode 23 located in the flat region 25.

[0244] As an example, the electrode assembly 2 may also include a separator 24, which is disposed between the positive electrode 22 and the negative electrode 23, and serves to separate the positive electrode 22 and the negative electrode 23. The portion of the positive electrode 22 located in the flat region 25, the portion of the negative electrode 23 located in the flat region 25, and the portion of the separator 24 located in the flat region 25 are stacked along the first direction X.

[0245] The first direction X is the stacking direction of the portion of the positive electrode 22 located in the flat region 25 and the portion of the negative electrode 23 located in the flat region 25. During cycling, the electrode assembly 2 expands more along the first direction X, and the first wall 111 is more affected by the expansion of the electrode assembly 2. Since the first region 1111 strengthens the area of ​​the first wall 111 near the connection portion 7, the risk of fatigue cracking of the first wall 111 near the connection portion 7 due to the expansion of the electrode assembly 2 is reduced.

[0246] In some embodiments, please refer to Figure 22 and Figure 23 The electrode assembly 2 has a wound structure and also has a corner region 26. The straight region 25 has a corner region 26 at at least one end along the third direction Y. The first direction X, the second direction Z and the third direction Y are not coplanar and intersect each other.

[0247] The straight area 25 may have a corner area 26 at only one end along the third direction Y, or it may have corner areas 26 at both opposite ends along the third direction Y. The first direction X, the second direction Z, and the third direction Y are not coplanar, and any two of the first direction X, the second direction Z, and the third direction Y may be set at acute angles, right angles, or obtuse angles.

[0248] As an example, the positive electrode 22, the separator 24, and the negative electrode 23 are stacked and wound to form a wound structure. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other, and the straight region 25 has corner regions 26 at both ends along the third direction Y. The portions of the positive electrode 22, the negative electrode 23, and the separator 24 located in the corner regions 26 are in a bent state. The portion of the positive electrode 22 located in the corner region 26 can be at least partially arc-shaped, the portion of the negative electrode 23 located in the corner region 26 can be at least partially arc-shaped, and the portion of the separator 24 located in the corner region 26 can be at least partially arc-shaped.

[0249] For the wound electrode assembly, the flat region 25 expands more in the second direction Z. Since the first region 1111 strengthens the area of ​​the first wall 111 near the connection 7, it can effectively reduce the risk of fatigue cracking of the first wall 111 near the connection 7 due to the expansion of the electrode assembly 2.

[0250] In some embodiments, please refer to Figure 24 and Figure 25 The electrode assembly 2 has a stacked structure. The flat region 25 includes multiple positive electrode plates 22 and multiple negative electrode plates 23. The multiple positive electrode plates 22 and multiple negative electrode plates 23 are stacked along the first direction X.

[0251] As an example, multiple positive electrode plates 22, multiple negative electrode plates 23, and multiple separators 24 are stacked along the first direction X to form a stacked structure. The positive electrode plates 22 and negative electrode plates 23 are completely located in the flat region 25, and separators 24 are provided between adjacent positive electrode plates 22 and negative electrode plates 23.

[0252] For stacked electrode assemblies, the expansion of electrode assembly 2 is greater in the stacking direction of positive electrode 22 and negative electrode 23. Since the first region 1111 strengthens the area of ​​the first wall 111 near the connection portion 7, the risk of fatigue cracking of the first wall 111 near the connection portion 7 due to the expansion of electrode assembly 2 can be effectively reduced.

[0253] This application provides an electrical device, including the battery device 100 provided in any of the above embodiments.

[0254] This application embodiment also provides a battery device 100, including multiple rows of battery cells 10 and multiple thermal management components 30. The multiple thermal management components 30 are arranged along a first direction X, and a row of battery cells 10 is disposed between two adjacent thermal management components 30. The thermal management components 30 are water-cooled plates, and the thermal management components 30 extend along a third direction Y. Multiple battery cells 10 in a row of battery cells 10 are arranged along a third direction Y.

[0255] The battery cell 10 includes a housing 11, an end cap 12, and an electrode assembly 2. The housing 11 has an opening at one end along the second direction Z, and the end cap 12 closes the opening. The end cap 12 is welded to a first wall 111 to form a connection portion 7. The electrode assembly 2 is at least partially housed within the housing 11. The housing 11 includes a first wall 111 that is thermally connected to a thermal management component 30. The first wall 111 includes a first region 1111 and a second region 1112 arranged along the second direction Z. The thickness of the first region 1111 is greater than the thickness of the second region 1112. Along the second direction Z, the first region 1111 is located between the connection portion 7 and the second region 1112. The first direction X, the second direction Z, and the third direction Y are not coplanar and intersect each other. Along the second direction Z, the end of the thermal management component 30 near the end cap 12 is a first end 301. At least a portion of the first region 1111 extends beyond the first end 301 in the direction from the electrode assembly 2 to the end cap 12.

[0256] Along the first direction X, the second region 1112 has a first outer surface 11121 facing the outside of the housing 11. The first outer surface 11121 is in contact with the thermal management component 30. The first region 1111 includes a first protrusion 11111 protruding from the first outer surface 11121. In a projection plane perpendicular to the first direction X, the orthographic projection of the first protrusion 11111 does not overlap with the orthographic projection of the thermal management component 30.

[0257] The battery device 100 also includes two end plates 203, which are spaced apart along a first direction X. Multiple rows of battery cells 10 and multiple thermal management components 30 are disposed between the two end plates 203. Along the first direction X, the thermal management component 30 located between two adjacent rows of battery cells 10 is a first thermal management component 30a, and the thermal management component 30 located between the end plate 203 and the row of battery cells 10 closest to the end plate 203 is a second thermal management component 30b. The maximum thickness of the first thermal management component 30a is D1, the maximum thickness of the second thermal management component 30b is D2, and the maximum thickness of the first protrusion 11111 is L1, where L1≤D1 / 2, L1≤D2, and 0.3D1≤D2≤0.7D1.

[0258] The thermal management component 30 includes a main body region 302 and a thinning region 303. The thickness of the thinning region 303 is less than the thickness of the main body region 302. The main body region 302 is thermally connected to the second region 1112. Along the second direction Z, thinning regions 303 are provided at both ends of the main body region 302. The end of the thinning region 303 closest to the connecting portion 7 and furthest from the main body region 302 is the first end 301. The thickness of the thinning region 303 decreases along the direction from the main body region 302 to the thinning region 303. Along the first direction X, there is a gap between the thinning region 303 and the first wall 111.

[0259] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0260] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. 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 device, characterized in that, include: Multiple thermal management components are arranged along a first direction; A battery cell, disposed along the first direction between two adjacent thermal management components, the battery cell comprising: The housing has an opening at at least one end along a second direction, the housing includes a first wall that is thermally connected to the thermal management component, the first wall includes a first region and a second region arranged along the second direction, the thickness of the first region is greater than the thickness of the second region, and the second direction intersects the first direction; An end cap is provided to close the opening. The end cap is welded to the first wall to form a connection. Along the second direction, the first region is located between the connection and the second region. The electrode assembly is at least partially housed within the housing; Wherein, along the second direction, the end of the thermal management component near the end cap is the first end, and at least a portion of the first region extends beyond the first end along the direction of the electrode assembly pointing towards the end cap.

2. The battery device as claimed in claim 1, characterized in that, Along the first direction, the second region has a first outer surface facing the exterior of the housing, the first outer surface directly or indirectly abutting the thermal management component, the first region including a first protrusion protruding from the first outer surface, at least a portion of the first protrusion extending beyond the first end in the direction of the electrode assembly toward the end cap.

3. The battery device as claimed in claim 2, characterized in that, In a projection plane perpendicular to the first direction, the orthographic projection of the first protrusion does not overlap with the orthographic projection of the thermal management component.

4. The battery device as claimed in claim 2, characterized in that, The battery device includes a plurality of battery cells arranged along the first direction. A thermal management component is disposed between two adjacent battery cells along the first direction. The thermal management component located between two adjacent battery cells is a first thermal management component. The maximum thickness of the first thermal management component is D1, and the maximum thickness of the first protrusion is L1, where L1 ≤ D1 / 2.

5. The battery device as claimed in claim 2, characterized in that, The battery device includes an end plate and a plurality of battery cells arranged along the first direction. A thermal management component is disposed between two adjacent battery cells along the first direction. The plurality of battery cells are located on the same side of the end plate. The thermal management component located between the end plate and the battery cell closest to the end plate is a second thermal management component. The maximum thickness of the second thermal management component is D2, and the maximum thickness of the first protrusion is L1, where L1 ≤ D2.

6. The battery device as claimed in claim 5, characterized in that, Along the first direction, the thermal management component located between two adjacent battery cells is the first thermal management component, and the maximum thickness of the first thermal management component is D1, where 0.3D1≤D2≤0.7D1.

7. The battery device as claimed in claim 5, characterized in that, The end plate includes an extension region that extends beyond the first end in the direction from the electrode assembly toward the end cap, and at least a portion of the orthographic projection of the extension region overlaps with at least a portion of the orthographic projection of the first protrusion in a projection plane perpendicular to the first direction.

8. The battery device according to any one of claims 1-7, characterized in that, The thermal management component includes a main body region and a thinning region. The thickness of the thinning region is less than the thickness of the main body region. The main body region is thermally connected to the second region. Along the second direction, at least one end of the main body region is provided with the thinning region. The end of the thinning region near the connection portion that is away from the main body region is the first end.

9. The battery device as claimed in claim 8, characterized in that, The thickness of the thinning region decreases along the direction from the main body region to the thinning region.

10. The battery device as claimed in claim 8, characterized in that, Along the first direction, there is a gap between the thinned region and the first wall.

11. The battery device according to any one of claims 1-7, characterized in that, In a projection plane perpendicular to the first direction, the orthographic projection of the first region does not overlap with the orthographic projection of the thermal management component.

12. The battery device according to any one of claims 1-7, characterized in that, Along the first direction, the second region has a first outer surface facing the outside of the housing and a first inner surface facing the inside of the housing, the first outer surface directly or indirectly abutting the thermal management component, a portion of the first region protruding from the first outer surface, and another portion of the first region protruding from the first inner surface.

13. The battery device as claimed in claim 12, characterized in that, The first region includes a first protrusion protruding from the first outer surface and a second protrusion protruding from the first inner surface. Along the first direction, the maximum thickness of the first protrusion is L1, and the maximum thickness of the second protrusion is L2, where L1 > L2.

14. The battery device as claimed in claim 13, characterized in that, 0.05mm≤L1≤1.2mm.

15. The battery device as claimed in claim 13, characterized in that, 0.05mm≤L2≤1mm.

16. The battery device according to any one of claims 1-7, characterized in that, The first wall further includes a transition zone connected to one end of the first zone away from the second zone along the second direction. The transition zone is connected to the connecting portion, and the connection position of the transition zone and the connecting portion forms a connection interface. The connection interface has a first position closest to the first zone along the second direction, and the first position is located at one end of the first zone away from the second zone along the second direction.

17. The battery device as claimed in claim 16, characterized in that, At least a portion of the connection interface extends at an angle relative to the first direction.

18. The battery device as claimed in claim 17, characterized in that, The connection interface includes a first interface that extends obliquely from the first position toward the end cap, and at least a portion of the transition area is located between the first interface and the end cap along the first direction.

19. The battery device as claimed in claim 18, characterized in that, The first interface is connected to the outer surface of the first area at the first position.

20. The battery device as claimed in claim 17, characterized in that, The connection interface includes a second interface that extends obliquely from the first position toward the end cap. Along the first direction, at least a portion of the transition area is located on the side of the second interface away from the end cap.

21. The battery device as claimed in claim 20, characterized in that, The second interface is connected to the inner surface of the first area at the first position.

22. The battery device as claimed in claim 16, characterized in that, The Vickers hardness of the transition zone is less than that of the second zone; and / or, the Vickers hardness of the transition zone is less than that of the connecting portion.

23. The battery device according to any one of claims 1-7, characterized in that, At least a portion of the Vickers hardness in the first region is less than that in the second region.

24. The battery device according to any one of claims 1-7, characterized in that, The electrode assembly includes a positive electrode and a negative electrode, at least a portion of the positive electrode and at least a portion of the negative electrode are stacked along the first direction, and the first wall is the wall with the largest outer surface area in the housing.

25. The battery device as claimed in claim 24, characterized in that, The electrode assembly has a flat region, and the portion of the positive electrode plate located in the flat region and the portion of the negative electrode plate located in the flat region are stacked along the first direction.

26. The battery device as claimed in claim 25, characterized in that, The electrode assembly has a wound structure and also has a corner region. The corner region is provided at least one end of the straight region along a third direction. The first direction, the second direction, and the third direction are not coplanar and intersect each other.

27. The battery device as claimed in claim 25, characterized in that, The electrode assembly is a stacked structure, and the flat region includes a plurality of positive electrode plates and a plurality of negative electrode plates, which are stacked along the first direction.

28. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-27.

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