Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes a housing and an electrode assembly. The shell comprises a plurality of wall parts, and a containing space is defined by the wall parts. The electrode assembly is accommodated in the accommodation space. Wherein at least one wall part is provided with a reinforcing rib. At least one wall part of the shell is provided with the reinforcing ribs, and the reinforcing ribs can enhance the strength of the wall part and the deformation resistance of the shell, so that the risk that the electrode assembly is pressed and damaged due to the fact that the shell is extruded by external force is reduced, and the structural stability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Art

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

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. Battery devices consist of battery cells. During the manufacturing process, these cells are prone to deformation, which can affect their performance. Therefore, enhancing the structural stability of battery cells is a pressing technical challenge in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery device, and an electrical device, which can improve the structural stability of the battery cell.

[0005] In a first aspect, embodiments of the present application provide a battery cell comprising a housing and an electrode assembly. The housing comprises a plurality of walls, which enclose a storage space. The electrode assembly is accommodated within the storage space. At least one of the walls is provided with a reinforcing rib.

[0006] In the above technical solution, at least one wall of the shell is provided with reinforcing ribs, which can enhance the strength of the wall and the deformation resistance of the shell, reduce the risk of the shell being squeezed by external force and causing the electrode assembly to be compressed and damaged, and improve the structural stability of the battery cell.

[0007] In some embodiments, the housing includes a shell and an end cap, wherein one wall portion serves as the end cap, the shell has an opening, and the end cap covers the opening. At least one wall portion of the shell is provided with reinforcing ribs. Providing reinforcing ribs on at least one wall portion of the shell enhances the shell's strength, improves its deformation resistance, and improves its structural stability.

[0008] In some embodiments, the thickness of the wall portion of the housing is 0.1 mm to 0.5 mm. In this way, the battery cell can have a thinner housing, which helps to increase the volume energy density of the battery cell when the volume of the battery cell is constant.

[0009] In some embodiments, the plurality of wall portions include a first wall portion and a second wall portion adjacently disposed along the circumference of the opening. The first wall portion and the second wall portion are formed on the housing. The outer surface area of ​​the first wall portion is smaller than the outer surface area of ​​the second wall portion. The first wall portion is provided with reinforcing ribs. Providing the reinforcing ribs on the first wall portion can increase the strength of the first wall portion, thereby improving the first wall portion's deformation resistance and enhancing the structural stability of the first wall portion.

[0010] In some embodiments, the dimension of the reinforcing rib along the thickness direction of the first wall portion is 0.1mm-1mm. When the dimension of the reinforcing rib along the thickness direction of the first wall portion is greater than or equal to 0.1mm, the reinforcing rib can have sufficient strength, reducing the risk of the reinforcing rib being damaged during use of the battery cell, and the reinforcing rib can maintain its reinforcing effect on the first wall portion; when the dimension of the reinforcing rib along the thickness direction of the first wall portion is less than or equal to 1mm, the space occupied by the reinforcing rib can be reduced, reducing the impact of the reinforcing rib on the use and installation of the battery cell; therefore, when the dimension of the reinforcing rib along the thickness direction of the first wall portion is 0.1mm-1mm, it is possible to maintain the strength of the reinforcing rib and reduce the space occupied by the reinforcing rib, thereby improving the performance of the battery cell.

[0011] In some embodiments, an opening is provided at at least one end of the shell along the first direction, and the size of the shell along the first direction is L1; a reinforcing rib is provided on the first wall portion, and the size of the reinforcing rib along the first direction is L2; ​​or a plurality of reinforcing ribs are provided on the first wall portion, and the plurality of reinforcing ribs are arranged along the first direction, and the sum of the sizes of the plurality of reinforcing ribs along the first direction is L2; ​​0.01≤L2 / L1≤1.

[0012] In the above embodiment, when L2 / L1≥0.01, the reinforcing effect of the reinforcing rib on the first wall portion of the shell can be maintained; when L2 / L1≤1, the reinforcing rib can be prevented from protruding from the shell, thereby reducing the interference of the reinforcing rib on external components; therefore, when 0.01≤L2 / L1≤1, it is possible to take into account both maintaining the reinforcing effect of the reinforcing rib on the first wall portion and reducing the interference of the reinforcing rib on external components.

[0013] In some embodiments, the shell is formed by bending a plate as a whole, the first wall portion includes a first part and a second part, the first part and the second part are welded together to form a first connecting portion, the reinforcing rib arranged on the first wall portion is a first reinforcing rib, and in a projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the first connecting portion at least partially overlaps with the orthographic projection of the first reinforcing rib.

[0014] In the above embodiment, the orthographic projection of the first connecting portion and the orthographic projection of the first reinforcing rib at least partially overlap within a projection plane perpendicular to the thickness direction of the first wall portion. The first reinforcing rib can strengthen the strength of the first connecting portion, thereby enhancing the weld strength between the first and second portions, reducing the risk of cracking between the first and second portions, and improving the structural stability of the battery cell. The first reinforcing rib can also enhance the strength of the first wall portion and improve its deformation resistance.

[0015] In some embodiments, the first portion and the second portion are both provided with first reinforcing ribs. Providing the first reinforcing ribs on both the first portion and the second portion can enhance the structural strength of the first portion and the second portion, enhance the deformation resistance of the first portion and the second portion, and reduce the risk of damage to the first portion and the second portion.

[0016] In some embodiments, the housing is provided with an opening at at least one end along the first direction. The first reinforcing rib extends along the first direction, and the first reinforcing rib provided on the first portion and the first reinforcing rib provided on the second portion are stacked along the second direction, with the first direction, the second direction, and the thickness direction of the first wall being perpendicular to each other.

[0017] In the above embodiment, by stacking the first reinforcing ribs on the first part and the first reinforcing ribs on the second part, the structural strength of the first reinforcing ribs can be improved, the structural strength of the first part and the second part can be enhanced, the deformation resistance of the first wall can be improved, and the structural stability of the battery cell can be improved.

[0018] In some embodiments, the first reinforcing rib provided on the first portion is engaged with the first reinforcing rib provided on the second portion. By engaging the first reinforcing rib of the first portion with the second reinforcing rib of the second portion, the connection strength between the first portion and the second portion can be enhanced, reducing the risk of damage to the first connection portion.

[0019] In some embodiments, the first reinforcing rib provided on the first portion and the first reinforcing rib provided on the second portion are respectively the two ends of the plate. The two reinforcing ribs on the first portion and the second portion are the two ends of the plate, which makes the processing of the first reinforcing rib more convenient, reduces the difficulty of forming the first reinforcing rib, and enhances the reinforcing effect of the first reinforcing rib on the shell.

[0020] In some embodiments, the first connecting portion extends to the first reinforcing rib along the thickness direction of the wall portion. By extending the first connecting portion to the first reinforcing rib, the connection area between the first portion and the second portion can be increased, and the connection stability between the first portion and the second portion can be improved, thereby improving the structural stability of the battery cell.

[0021] In some embodiments, a first reinforcing rib connects the first portion and the second portion. By providing the first reinforcing rib to connect the first portion and the second portion, the first reinforcing rib can strengthen the connection strength between the first portion and the second portion, reducing the risk of the first connection portion being damaged.

[0022] In some embodiments, along the thickness direction of the first wall portion, the first reinforcing rib includes a first overlapping area overlapping with the first portion and a second overlapping area overlapping with the second portion, the first overlapping area is connected to the first portion, and the second overlapping area is connected to the second portion.

[0023] In the above embodiment, by providing the first overlapping area connected to the first part and the second overlapping area connected to the second part, it is convenient to connect the first reinforcing rib with the first part and the second part, thereby improving the structural strength of the first wall portion.

[0024] In some embodiments, the first overlapping region is welded to the first portion, and the second overlapping region is welded to the second portion. By welding the first overlapping region to the first portion and the second overlapping region to the second portion, the connection strength between the first reinforcing rib and the first and second portions is improved, and the risk of the first reinforcing rib detaching from the first and second portions is reduced.

[0025] In some embodiments, the first reinforcing rib extends along a curved track. By setting the first reinforcing rib to extend along the curved track, the length of the first reinforcing rib can be extended, which is beneficial to improving the strength of the first wall portion.

[0026] In some embodiments, the first reinforcing rib includes a plurality of first overlapping regions and / or a plurality of second overlapping regions. The plurality of first overlapping regions and / or the plurality of second overlapping regions facilitates the first reinforcing rib to connect the first portion and the second portion, thereby increasing the connection strength between the first reinforcing rib, the first portion and the second portion, and thus increasing the connection strength between the first portion and the second portion.

[0027] In some embodiments, the housing has an opening at at least one end along the first direction, and the first wall portion is provided with a plurality of first reinforcing ribs, the plurality of first reinforcing ribs being spaced apart along the first direction. By providing the plurality of first reinforcing ribs along the first direction, the plurality of first reinforcing ribs can each connect the first portion and the second portion, thereby enhancing the connection strength of the first connecting portion.

[0028] In some embodiments, the reinforcing rib provided on the first wall portion is a first reinforcing rib, and the first reinforcing rib is provided on the side of the first wall portion facing the electrode assembly. By providing the first reinforcing rib on the side of the first wall portion facing the electrode assembly, the space occupied by the battery cells can be reduced, and the risk of interference between external components and the first reinforcing rib can be reduced.

[0029] In some embodiments, the end cover is welded to at least one wall portion in the shell to form a second connecting portion, the wall portion in the shell welded to the end cover is a third wall portion, the third wall portion is provided with reinforcing ribs, and the reinforcing ribs provided on the third wall portion are second reinforcing ribs. In a projection plane perpendicular to the thickness direction of the third wall portion, the orthographic projection of the second connecting portion at least partially overlaps with the orthographic projection of the second reinforcing rib.

[0030] In the above embodiment, in the projection plane perpendicular to the thickness direction of the third wall portion, the orthographic projection of the second connecting portion and the orthographic projection of the second reinforcing rib at least partially overlap, so that the second reinforcing rib can be arranged close to the second connecting portion, thereby enhancing the connection strength between the end cover and the shell, reducing the risk of the end cover being separated from the shell, improving the structural strength of the battery cell, and improving the structural stability of the battery cell.

[0031] In some embodiments, the second reinforcing rib is disposed on the side of the third wall facing the electrode assembly. This arrangement reduces the space occupied by the battery cells and reduces the risk of interference between external components and the second reinforcing rib.

[0032] In some embodiments, the multiple wall portions include a second wall portion disposed along the circumference of the opening. The second wall portion is the wall portion with the largest outer surface area in the housing, and the second wall portion is provided with reinforcing ribs. The provision of reinforcing ribs on the second wall portion enhances the strength of the second wall portion, improving its deformation resistance and thereby improving the structural stability of the battery cell.

[0033] In some embodiments, the second wall portion is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs include a third reinforcing rib and a fourth reinforcing rib, and the third reinforcing rib and the fourth reinforcing rib are cross-arranged.

[0034] In the above embodiment, the third reinforcing ribs and the fourth reinforcing ribs are cross-arranged, which can enhance the structural strength of the third reinforcing ribs and the fourth reinforcing ribs, thereby enhancing the reinforcing effect of the reinforcing ribs on the second wall portion and improving the structural strength of the second wall portion.

[0035] In some embodiments, the third and fourth reinforcing ribs are located on a side of the second wall facing away from the electrode assembly. By arranging the third and fourth reinforcing ribs on the side of the second wall facing away from the electrode assembly, when the battery cells and external components are arranged along the thickness direction of the second wall, the third and fourth reinforcing ribs can increase the distance between the second wall of the battery cells and the external components, thereby improving the heat dissipation effect of the battery cells.

[0036] In some embodiments, the housing includes a shell and an end cover, wherein one wall portion is the end cover, the shell has an opening, and the end cover covers the opening. The end cover is provided with a reinforcing rib.

[0037] In the above embodiment, the end cover is provided with reinforcing ribs to enhance the strength of the end cover and improve the deformation resistance of the end cover, thereby improving the structural stability of the battery cell.

[0038] In some embodiments, the thickness of the end cap is 0.5 mm to 5 mm. By setting the thickness of the end cap to 0.5 mm to 5 mm, the structural strength of the end cap can be improved, which helps to improve the connection stability between the end cap and the housing.

[0039] In some embodiments, the end cover is welded to at least one wall portion in the shell to form a second connection portion, and the reinforcement rib provided on the end cover is a fifth reinforcement rib. In a projection plane perpendicular to the thickness direction of the end cover, the orthographic projection of the second connection portion at least partially overlaps with the orthographic projection of the fifth reinforcement rib.

[0040] In the above embodiment, in the projection plane perpendicular to the thickness direction of the end cover, the orthographic projection of the second connecting part and the orthographic projection of the fifth reinforcing rib at least partially overlap, so that the fifth reinforcing rib can be arranged close to the second connecting part, thereby enhancing the connection strength of the second connecting part.

[0041] In some embodiments, the fifth reinforcing rib is disposed on the side of the end cap facing the electrode assembly. This arrangement reduces the space occupied by the battery cell and reduces the risk of interference with the fifth reinforcing rib by external components.

[0042] In some embodiments, the end cover is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs include a sixth reinforcing rib and a seventh reinforcing rib, and the sixth reinforcing rib and the seventh reinforcing rib are cross-arranged.

[0043] In the above embodiment, the cross arrangement of the sixth reinforcing rib and the seventh reinforcing rib can enhance the connection strength between the sixth reinforcing rib and the seventh reinforcing rib, thereby facilitating the structural strength of the end cover and improving the structural stability of the battery cell.

[0044] In some embodiments, the sixth and seventh reinforcing ribs are located on the side of the end cap facing the electrode assembly. This placement of the sixth and seventh reinforcing ribs on the side of the end cap facing the electrode assembly can reduce the space occupied by the battery cells, thereby reducing the risk of interference with the sixth and seventh reinforcing ribs by external components.

[0045] In some embodiments, the end cap is provided with a first electrode terminal and a second electrode terminal of opposite polarity, the first electrode terminal and the second electrode terminal being spaced apart along a third direction, and the housing has a first wall portion and a third wall portion disposed opposite each other along the third direction, wherein along the third direction, the first wall portion is closer to the first electrode terminal than to the second electrode terminal, and the third wall portion is closer to the second electrode terminal than to the first electrode terminal. The reinforcing rib provided on the end cap is an eighth reinforcing rib, and along the third direction, the eighth reinforcing rib is provided between the first electrode terminal and the first wall portion, and / or, between the second electrode terminal and the third wall portion.

[0046] In the above embodiment, the eighth reinforcing rib can enhance the strength of the end cover, thereby reducing the risk of deformation of the end cover affecting the sealing performance of the battery cell.

[0047] In some embodiments, the end cap is provided with a first electrode terminal and a second electrode terminal of opposite polarity, the first electrode terminal and the second electrode terminal being spaced apart along a third direction. The reinforcing rib provided on the end cap is an eighth reinforcing rib, which is provided between the first and second electrode terminals along the third direction. The eighth reinforcing rib provided between the first and second electrode terminals can enhance the structural strength of the end plate and improve the structural stability of the battery cell.

[0048] In some embodiments, the end cap is further provided with a pressure relief mechanism. Multiple eighth reinforcing ribs are provided along the third direction, one between the pressure relief mechanism and the first electrode terminal, and one between the pressure relief mechanism and the second electrode terminal. Providing eighth reinforcing ribs on both sides of the pressure relief mechanism enhances the structural strength of the end cap surrounding the pressure relief mechanism, reducing the risk of damage to the end cap prior to the pressure relief mechanism.

[0049] In a second aspect, an embodiment of the present application provides a battery device, comprising a battery cell provided by any embodiment of the first aspect.

[0050] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect or a battery device provided by any embodiment of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] Figure 1A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0053] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0054] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0055] Figure 4 for Figure 3 an axonometric view of a battery cell as shown;

[0056] Figure 5 A schematic structural diagram of a housing provided in some embodiments of the present application;

[0057] Figure 6 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0058] Figure 7 for Figure 6 AA cross-sectional view;

[0059] Figure 8 for Figure 7 A partial enlarged view of area A in the middle;

[0060] Figure 9 A schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0061] Figure 10 A schematic structural diagram of a battery cell provided in some further embodiments of the present application;

[0062] Figure 11 A schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0063] Figure 12 for Figure 11 BB cross-sectional view;

[0064] Figure 13 for Figure 12 A partial enlarged view of the middle B area;

[0065] Figure 14 A schematic structural diagram of a battery cell provided in some embodiments of the present application (showing that the second wall portion is provided with reinforcing ribs);

[0066] Figure 15 A schematic structural diagram of a battery cell provided in some embodiments of the present application (the end cap is provided with reinforcing ribs);

[0067] Figure 16 for Figure 15 CC cross-sectional view;

[0068] Figure 17 for Figure 16 A partial enlarged view of the middle C area;

[0069] Figure 18 A schematic structural diagram of a battery cell provided in some embodiments of the present application (showing the sixth and seventh reinforcing ribs);

[0070] Figure 19 A schematic structural diagram of a battery cell provided in some embodiments of the present application (showing a first electrode terminal and a second electrode terminal);

[0071] Figure 20 for Figure 19 DD cross-sectional view.

[0072] Icons: 1000 - vehicle; 100 - battery device; 10 - battery cell; 1 - housing; 11 - casing; 11a - opening; 11b - storage space; 12 - end cap; 13 - wall; 131 - first wall; 1311 - first portion; 1312 - second portion; 1313 - first connecting portion; 132 - second wall; 133 - third wall; 2 - electrode assembly; 21 - positive electrode tab; 22 - negative electrode tab; 23 - recess; 3 - electrode terminal; 31 - first electrode terminal; 32 - second electrode terminal; 4 - reinforcing rib; 41-first reinforcing rib; 411-first overlapping area; 412-second overlapping area; 413-first reinforcing portion; 414-second reinforcing portion; 42-second reinforcing rib; 43-third reinforcing rib; 44-fourth reinforcing rib; 45-fifth reinforcing rib; 46-sixth reinforcing rib; 47-seventh reinforcing rib; 48-eighth reinforcing rib; 5-second connecting portion; 6-pressure relief mechanism; 20-box; 201-first box; 202-second box; 200-controller; 300-motor; X-third direction; Y-second direction; Z-first direction. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0076] 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.

[0077] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0078] The term "plurality" used in this application refers to two or more (including two).

[0079] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0080] 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-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0081] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0082] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0083] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0084] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a surface silver plating treatment, stainless steel with a surface silver plating treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0085] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0086] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0087] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0088] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0090] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0091] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0092] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0093] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0094] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0095] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0096] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0097] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0098] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0099] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0100] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0101] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0102] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0103] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0104] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0105] In some embodiments, the electrode assembly is a laminate structure.

[0106] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0107] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0108] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0109] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0110] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0111] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0112] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0113] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0114] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal battery cells. Polygonal battery cells are, for example, hexagonal battery cells.

[0115] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0116] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells. As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0117] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0118] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0119] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0120] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0121] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0122] As an example, the box body may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0123] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0124] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0125] During the production of battery cells, the cell shell wall thickness can be reduced to reduce the mass of the battery cell. This allows for the inclusion of a larger electrode assembly within the same volume of the battery cell, thereby increasing the energy density of the battery cell. However, the thinner cell shell wall thickness reduces the strength of the shell wall, increasing the risk of shell deformation and rupture. The shell structure is unstable, and when the shell is squeezed by external forces, it can easily cause the electrode assembly to be damaged, affecting the performance of the battery cell.

[0126] In view of this, in order to improve the structural stability of the battery cell, an embodiment of the present application provides a technical solution. By arranging reinforcing ribs on at least one wall of the shell, the reinforcing ribs can enhance the shell's anti-deformation ability, reduce the risk of the electrode assembly being damaged by pressure, and improve the structural stability of the battery cell.

[0127] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0128] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0129] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery device 100 is disposed within vehicle 1000. Battery device 100 can be located at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as the operating power source of vehicle 1000.

[0130] The vehicle 1000 may further 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, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0131] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0132] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a box body 20 and a battery cell 10 . The box body 20 is used to accommodate the battery cell 10 .

[0133] Among them, a closed space for accommodating the battery cell 10 is formed inside the box body 20. The box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first box body 201 and a second box body 202, and the first box body 201 and the second box body 202 are buckled with each other. The first box body 201 and the second box body 202 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first box body 201 may be a hollow structure with one side open, and the second box body 202 may also be a hollow structure with one side open. The open side of the second box body 202 is buckled with the open side of the first box body 201 to form a box body 20 with a closed space. The first box body 201 may also be a hollow structure with one side open, and the second box body 202 may be a plate-like structure. The second box body 202 is buckled with the open side of the first box body 201 to form a box body 20 with a accommodating cavity.

[0134] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be connected in series, parallel, or in a hybrid connection to form a battery module, which is then connected in series, parallel, or in a hybrid connection to form a single unit and housed within the housing 20. Alternatively, all battery cells 10 can be directly connected in series, parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 10 is housed within the housing 20.

[0135] In some embodiments, the battery device 100 may further include a busbar component, through which the multiple battery cells 10 can be electrically connected to each other, thereby enabling series connection, parallel connection, or hybrid connection of the multiple battery cells 10. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0136] Please refer to Figure 3 and Figure 4 , Figure 3 An exploded view of a battery cell 10 provided in some embodiments of the present application; Figure 4 for Figure 3 The battery cell 10 is shown in an isometric view. The battery cell 10 may include a housing 1 and an electrode assembly 2 , wherein the electrode assembly 2 is accommodated in the housing 1 .

[0137] In some embodiments, the housing 1 may include a shell 11 and an end cap 12, wherein the shell 11 has an opening 11a and the end cap 12 closes the opening 11a of the shell 11. The term "closed" here means to cover or close, and may be sealed or non-sealed.

[0138] The housing 11 is a component for accommodating the electrode assembly 2. The housing 11 can be a hollow structure with an opening 11a formed at one end, or it can be a hollow structure with openings 11a formed at opposite ends. The housing 11 can have various shapes, such as a cylinder or a rectangular parallelepiped. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys. The electrode assembly 2 can be partially or completely located within the housing 11.

[0139] The end cap 12 and the shell 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 12 can be connected to the shell 11 by welding, crimping, etc. to close the opening 11a of the shell 11. The shape of the end cap 12 can be adapted to the shape of the shell 11. For example, the shell 11 is a rectangular parallelepiped structure, and the end cap 12 is a rectangular plate structure adapted to the shell 11. For another example, the shell 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the shell 11. The material of the end cap 12 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 12 and the shell 11 can be the same or different.

[0140] The electrode assembly 2 can be one or more. For example, Figure 3 As shown, the housing 11 has an opening 11a along a first direction Z, and the end cap 12 closes the opening 11a of the housing 11. There are two electrode assemblies 2, which are stacked along a second direction Y, and the first direction Z is perpendicular to the second direction Y.

[0141] In an embodiment where the housing 11 has an opening 11a formed at one end, one end cap 12 may be provided. In an embodiment where the housing 11 has openings 11a formed at opposite ends, two end caps 12 may be provided. The two end caps 12 respectively close the two openings 11a of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space.

[0142] In some embodiments, the battery cell 10 may further include an electrode terminal 3, which is disposed on the outer casing 1. The electrode terminal 3 is used to electrically connect to the tab of the electrode assembly 2 to input or output electrical energy from the battery cell 10. The electrode terminal 3 may be disposed on the shell 11 of the outer casing 1 or on the end cap 12 of the outer casing 1. The electrode terminal 3 and the tab may be directly connected, for example, by welding the electrode terminal 3 to the tab. The electrode terminal 3 and the tab may also be indirectly connected, for example, by indirectly connecting the electrode terminal 3 to the tab via a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0143] As an example, Figure 3 and Figure 4 As shown, an opening 11a is formed at one end of the housing 11. There is only one end cap 12 in the housing 1, and each end cap 12 closes the opening 11a of the housing 11. Two electrode terminals 3 are provided on the end cap 12, and the two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal. A positive electrode tab 21 and a negative electrode tab 22 are formed on the end of the electrode assembly 2 facing the end cap 12. The positive electrode terminal is electrically connected to the positive electrode tab 21, and the negative electrode terminal is electrically connected to the negative electrode tab 22.

[0144] Please refer to Figure 5 , Figure 5 Schematic diagram of the structure of a housing 1 provided in some embodiments of the present application. Embodiments of the present application provide a battery cell 10 comprising a housing 1 and an electrode assembly 2. Housing 1 includes multiple walls 13, which enclose a storage space 11b. Electrode assembly 2 is accommodated within storage space 11b. At least one wall 13 is provided with a reinforcing rib 4.

[0145] The battery cell 10 may be a cylindrical battery cell, a polygonal battery cell, or the like.

[0146] For example, the battery cell 10 is a cylindrical battery cell, and the outer shell 1 of the battery cell 10 includes an end cover 12 and a shell 11. The shell 11 is circumferentially arranged around the axis of the battery cell 10, and the shell 11 has two openings 11a. There are two end covers 12, and the two end covers 12 are arranged on the two openings 11a of the shell 11 along the axial direction of the battery cell 10. The battery cell 10 has three wall portions 13 in total, the two end covers 12 are two wall portions 13, and the shell 11 is one wall portion 13. Both the end cover 12 and the shell 11 of the cylindrical battery cell can be provided with reinforcing ribs 4.

[0147] For another example, the battery cell 10 is a square-shell battery cell, and one side of the shell 11 of the battery cell 10 has an opening 11a, and the end cover 12 is covered on the opening 11a of the shell 11. The battery cell 10 has six walls 13, and the end cover 12 is one of the walls 13. The shell 11 has five walls 13. The end cover 12 of the square-shell battery cell and any one of the walls 13 of the shell 11 can be provided with a reinforcing rib 4.

[0148] The reinforcing ribs 4 may be provided on only one wall 13 of the housing 1; for example, only one wall 13 of the shell 11 may be provided with the reinforcing ribs 4. Alternatively, the reinforcing ribs 4 may be provided on multiple walls 13 of the housing 1; for example, the shell 11 of a prismatic battery cell may have openings 11a on both sides along the first direction Z, with two end caps 12 covering the openings 11a. The housing 11 may have four walls 13, all of which may be provided with reinforcing ribs 4, while the end caps 12 may not be provided with reinforcing ribs 4. Alternatively, the reinforcing ribs 4 may be provided on all walls 13 of the housing 1.

[0149] It is possible that only one reinforcing rib 4 is provided on one wall portion 13. It is also possible that a plurality of reinforcing ribs 4 are provided on one wall portion 13, and the plurality of reinforcing ribs 4 can be provided crosswise or at intervals.

[0150] The reinforcing rib 4 may be provided on the side of the housing 1 facing the electrode assembly 2 , or may be provided on the side of the housing 1 facing away from the electrode assembly 2 .

[0151] As an example, Figure 5 As shown, only one wall portion 13 of the housing 11 is provided with a reinforcing rib 4 , and the reinforcing rib 4 is located on a side of the wall portion 13 facing away from the accommodating space 11 b .

[0152] In an embodiment of the present application, at least one wall portion 13 of the outer shell 1 is provided with a reinforcing rib 4. The reinforcing rib 4 can enhance the strength of the wall portion 13 provided with the reinforcing rib 4, thereby enhancing the deformation resistance of the outer shell 1, reducing the risk of the outer shell 1 being squeezed by external force and causing the electrode assembly 2 to be compressed and damaged, and improving the structural stability of the battery cell 10.

[0153] In some embodiments, the housing 1 includes a shell 11 and an end cover 12 , one wall portion 13 is the end cover 12 , the shell 11 has an opening 11 a , the end cover 12 covers the opening 11 a , and at least one wall portion 13 in the shell 11 is provided with a reinforcing rib 4 .

[0154] The shell 11 may have an opening 11a on only one side, with one end cover 12 covering the opening 11a; or the shell 11 may have openings 11a on both opposite sides, with two end covers 12 covering the two openings 11a respectively.

[0155] The reinforcing rib 4 may be provided on only one wall portion 13 of the housing 11, or on multiple walls 13 of the housing 11. A single wall portion 13 may be provided with only one reinforcing rib 4, or on multiple walls 13 of the housing 11. The reinforcing rib 4 may be provided on one wall portion 13, or on one wall portion 13. The reinforcing rib 4 may be provided on the side of the wall portion 13 of the housing 11 facing the electrode assembly 2, or on the side of the housing 11 facing away from the electrode assembly 2.

[0156] By providing reinforcing ribs 4 on at least one wall portion 13 of the shell 11 , the strength of the shell 11 can be enhanced, the deformation resistance of the shell 11 can be improved, and the structural stability of the shell 11 can be improved.

[0157] In some embodiments, the wall portion 13 in the housing 11 has a thickness of 0.1 mm to 0.5 mm.

[0158] The thicknesses of the walls 13 in the housing 11 may be uniform, or the thicknesses of at least two walls 13 in the housing 11 may be unequal. The thickness of any wall 13 may be any one of 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, and 0.5 mm, or a range of values ​​therebetween.

[0159] In the above embodiment, the thickness of the wall portion 13 of the shell 11 is 0.1mm-0.5mm, which allows the battery cell 10 to have a thinner shell 11. Given a given volume of the battery cell 10, this helps improve the volumetric energy density of the battery cell 10. Providing reinforcing ribs 4 on such a wall portion can improve the shell 11's resistance to deformation, reduce the risk of cracking due to the thin wall portion 13, and improve the structural stability of the shell 11. It can be seen that to meet the volumetric energy density requirements of the battery cell 10, the thickness of the wall portion 13 in the shell 11 can be set to 0.1mm-0.5mm. In the embodiment of the present application, providing reinforcing ribs 4 on at least one wall portion 13 of the shell 11 can enhance the deformation resistance of the wall portion 13. Therefore, providing reinforcing ribs 4 on the wall portion 13 of such a shell 11 can achieve both a higher volumetric energy density of the battery cell 10 and improved deformation resistance of the shell 11.

[0160] In some embodiments, please refer to Figure 5 The plurality of wall portions 13 include a first wall portion 131 and a second wall portion 132 adjacently arranged along the circumference of the opening 11 a . The first wall portion 131 and the second wall portion 132 are formed on the shell 11 . The outer surface area of ​​the first wall portion 131 is smaller than the outer surface area of ​​the second wall portion 132 . The first wall portion 131 is provided with a reinforcing rib 4 .

[0161] The first wall portion 131 and the second wall portion 132 are both wall portions 13 of the housing 11 .

[0162] The outer surface area of ​​the first wall portion 131 may be the area of ​​a projection of the first wall portion 131 along its thickness direction, and the outer surface area of ​​the second wall portion 132 may be the area of ​​a projection of the second wall portion 132 along its thickness direction.

[0163] As an example, Figure 5 As shown, the battery cell 10 is a prismatic battery cell. The outer surface area of ​​the two walls 13 of the housing 11, which are arranged opposite each other along the third direction X, is smaller than the outer surface area of ​​the two walls 13 of the housing 11, which are arranged opposite each other along the second direction Y. One of the two walls 13 arranged opposite each other along the third direction X is a first wall 131. A reinforcing rib 4 is provided on the side of the first wall 131 facing away from the electrode assembly 2. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other. It can be understood that the third direction X is the thickness direction of the first wall 131.

[0164] By providing the reinforcing ribs 4 on the first wall portion 131 , the reinforcing ribs 4 can enhance the strength of the first wall portion 131 , thereby improving the anti-deformation capability of the first wall portion 131 and enhancing the structural stability of the first wall portion 131 .

[0165] In some embodiments, along the thickness direction of the first wall portion 131 , the size of the reinforcing rib 4 is 0.1 mm-1 mm.

[0166] Along the thickness direction of the first wall portion 131 , the dimension of the reinforcing rib 4 is the maximum dimension of the reinforcing rib 4 along the third direction X.

[0167] The size of the reinforcing rib 4 can be any one of 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm or a range value between any two of them.

[0168] When the dimension of the reinforcing rib 4 along the thickness direction of the first wall portion 131 is greater than or equal to 0.1 mm, the reinforcing rib 4 can have sufficient strength, reducing the risk of the reinforcing rib 4 being damaged during the use of the battery cell 10, so that the reinforcing rib 4 can maintain its reinforcing effect on the first wall portion 131; when the dimension of the reinforcing rib 4 along the thickness direction of the first wall portion 131 is less than or equal to 1 mm, the space occupied by the reinforcing rib 4 can be reduced, reducing the impact of the reinforcing rib 4 on the use and installation of the battery cell 10; therefore, when the dimension of the reinforcing rib 4 along the thickness direction of the first wall portion 131 is 0.1 mm-1 mm, it is possible to take into account both maintaining the strength of the reinforcing rib 4 and reducing the space occupied by the reinforcing rib 4, thereby improving the performance of the battery cell 10.

[0169] In some embodiments, the housing 11 is provided with an opening 11a at at least one end thereof along the first direction Z. Along the first direction Z, the size of the housing 11 is L1 ( Figure 9 The size of the reinforcement rib 4 is L2 ( Figure 9 ), 0.01≤L2 / L1≤1.

[0170] The dimension of the reinforcing rib 4 along the first direction Z is the maximum dimension of the reinforcing rib 4 along the first direction Z.

[0171] The value of L2 / L1 can be any one of 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1 or any point value between them.

[0172] As an example, the size of the shell 11 is 120 mm, and the size of the reinforcement rib 4 is 96 mm.

[0173] In the above embodiment, when L2 / L1≥0.01, the reinforcing effect of the reinforcing rib 4 on the first wall portion 131 of the shell 11 can be maintained; when L2 / L1≤1, the reinforcing rib 4 can be prevented from protruding from the shell 11, thereby reducing the interference of the reinforcing rib 4 with external components; therefore, when 0.01≤L2 / L1≤1, it is possible to take into account both maintaining the reinforcing effect of the reinforcing rib 4 on the first wall portion 131 and reducing the interference of the reinforcing rib 4 with external components.

[0174] In some embodiments, please refer to Figure 6-Figure 8 , Figure 6 A schematic structural diagram of a battery cell 10 provided in some embodiments of the present application; Figure 7 for Figure 6 AA cross-sectional view; Figure 8 for Figure 7 A partial enlarged view of area A in the center. The housing 11 is integrally formed by bending a sheet material. The first wall portion 131 includes a first portion 1311 and a second portion 1312, which are welded together to form a first connecting portion 1313. The reinforcing rib 4 provided on the first wall portion 131 is a first reinforcing rib 41. In a projection plane perpendicular to the thickness direction of the first wall portion 131, the orthographic projection of the first connecting portion 1313 at least partially overlaps with the orthographic projection of the first reinforcing rib 41.

[0175] The first portion 1311 and the second portion 1312 are the portions that are connected after the shell 11 is bent into a ring. The first portion 1311 and the second portion 1312 are both part of the first wall portion 131. The first connecting portion 1313 is a weld mark formed by welding the first portion 1311 and the second portion 1312. Figure 8 As shown, the first connecting portion 1313 connects the first portion 1311 and the second portion 1312 .

[0176] There may be one or more first reinforcing ribs 41. In a projection plane perpendicular to the thickness direction of the first wall portion 131, a portion of the orthographic projection of the first connecting portion 1313 may overlap with a portion of the orthographic projection of the first reinforcing rib 41; or in a projection plane perpendicular to the thickness direction of the first wall portion 131, the orthographic projection of the first connecting portion 1313 may completely overlap with the orthographic projection of the first reinforcing rib 41.

[0177] In the above embodiment, in a projection plane perpendicular to the thickness direction of the first wall portion 131, the orthographic projection of the first connecting portion 1313 at least partially overlaps with the orthographic projection of the first reinforcing rib 41. The first reinforcing rib 41 can strengthen the strength of the first connecting portion 1313, thereby enhancing the welding strength between the first portion 1311 and the second portion 1312, reducing the risk of cracking between the first portion 1311 and the second portion 1312, and improving the structural stability of the battery cell 10. The first reinforcing rib 41 can enhance the strength of the first wall portion 131 and enhance its ability to resist deformation.

[0178] In some embodiments, please refer to Figure 8 Both the first portion 1311 and the second portion 1312 are provided with a first reinforcing rib 41 .

[0179] The first portion 1311 is provided with a first reinforcing rib 41 , and the second portion 1312 is also provided with a first reinforcing rib 41 .

[0180] By providing the first reinforcing ribs 41 on both the first part 1311 and the second part 1312, the first reinforcing ribs 41 can enhance the structural strength of the first part 1311 and the second part 1312, enhance the deformation resistance of the first part 1311 and the second part 1312, and reduce the risk of damage to the first part 1311 and the second part 1312.

[0181] In some embodiments, please refer to Figure 8 The housing 11 is provided with an opening 11a at at least one end thereof along the first direction Z. The first reinforcing ribs 41 extend along the first direction Z. The first reinforcing ribs 41 provided on the first portion 1311 and the first reinforcing ribs 41 provided on the second portion 1312 are stacked along the second direction Y. The first direction Z, the second direction Y, and the thickness direction of the first wall portion 131 are perpendicular to each other.

[0182] The first portion 1311 may be provided with only one first reinforcing rib 41 or may be provided with multiple first reinforcing ribs 41. The second portion 1312 may be provided with only one first reinforcing rib 41 or may be provided with multiple first reinforcing ribs 41.

[0183] The first reinforcing rib 41 arranged on the first part 1311 and the first reinforcing rib 41 arranged on the second part 1312 are stacked along the second direction Y, that is, the first reinforcing rib 41 on the first part 1311 and the first reinforcing rib 41 on the second part 1312 are arranged along the second direction Y, and the two adjacent first reinforcing ribs 41 along the second direction Y are in contact with each other.

[0184] In the above embodiment, by stacking the first reinforcing rib 41 on the first part 1311 and the first reinforcing rib 41 on the second part 1312, the structural strength of the first reinforcing rib 41 can be improved, the structural strength of the first part 1311 and the second part 1312 can be enhanced, the deformation resistance of the first wall portion 131 can be improved, and the structural stability of the battery cell 10 can be improved.

[0185] In some embodiments, the first reinforcing rib 41 disposed on the first portion 1311 is engaged with the first reinforcing rib 41 disposed on the second portion 1312 .

[0186] One of the first reinforcing ribs 41 on the first part 1311 and the second part 1312 may have a clamping portion, and the other may have a clamping slot, and the clamping portion cooperates with the clamping slot to realize the clamping of the first reinforcing rib 41 of the first part 1311 with the first reinforcing rib 41 arranged on the second part 1312.

[0187] By engaging the first reinforcing rib 41 of the first portion 1311 and the second reinforcing rib 42 of the second portion 1312 , the connection strength between the first portion 1311 and the second portion 1312 can be enhanced, thereby reducing the risk of the first connecting portion 1313 being damaged.

[0188] In some embodiments, please refer to Figure 8 The first reinforcing rib 41 provided on the first portion 1311 and the first reinforcing rib 41 provided on the second portion 1312 are respectively the two ends of the plate.

[0189] The first reinforcing rib 41 on the first portion 1311 and the first reinforcing rib 41 provided on the second portion 1312 are respectively the two ends of the plate. After the plate is bent into a ring, the ends of the plate are further bent to form two first reinforcing ribs 41.

[0190] The first reinforcing rib 41 may be formed on a side of the first wall portion 131 facing away from the electrode assembly 2 , or may be formed on a side of the first wall portion 131 facing the electrode assembly 2 .

[0191] The two reinforcing ribs 4 on the first part 1311 and the second part 1312 are the two ends of the plate, which makes the processing of the first reinforcing rib 41 more convenient, reduces the difficulty of forming the first reinforcing rib 41, and enhances the reinforcing effect of the first reinforcing rib 41 on the shell 1.

[0192] In some embodiments, please refer to Figure 8 , along the thickness direction of the wall portion 13 , the first connection portion 1313 extends to the first reinforcing rib 41 .

[0193] The first connecting portion 1313 extends to the first reinforcing rib 41 . That is, when the first portion 1311 and the second portion 1312 are welded, a weld mark formed by the first portion 1311 and the second portion 1312 extends to the first reinforcing rib 41 .

[0194] As an example, Figure 8 As shown, the first connection portion 1313 connects the first part 1311 and the second part 1312 and continues to extend toward the first reinforcing rib 41 to protrude from the surface of the first wall portion 131 facing the electrode assembly 2 , so that the first connection portion 1313 extends to the first reinforcing rib 41 .

[0195] By extending the first connection portion 1313 to the first reinforcing rib 41, the connection area between the first portion 1311 and the second portion 1312 is increased, improving the connection stability between the first portion 1311 and the second portion 1312, thereby enhancing the structural stability of the battery cell 10. By increasing the penetration depth of the first connection portion 1313, the weld between the first portion 1311 and the second portion 1312 is made more secure.

[0196] In some embodiments, please refer to Figure 9 , Figure 9 Schematic diagram of the structure of the battery cell 10 provided in some embodiments of the present application. The first reinforcing rib 41 connects the first portion 1311 and the second portion 1312.

[0197] There can be one first reinforcing rib 41, connecting the first portion 1311 and the second portion 1312. There can also be multiple first reinforcing ribs 41, each connecting the first portion 1311 and the second portion 1312.

[0198] The first reinforcing rib 41 may be connected between the first portion 1311 and the second portion 1312. Alternatively, the first reinforcing rib 41 may have overlapping regions with the first portion 1311 and the second portion 1312, and the first reinforcing rib 41 located in the corresponding overlapping regions may be connected to the first portion 1311 and the second portion 1312. The first reinforcing rib 41 may be connected to the first portion 1311 and the second portion 1312 by welding, bonding, or clamping.

[0199] The first reinforcing rib 41 may be in a strip shape, and the first reinforcing rib 41 extends along the first direction Z. The first reinforcing rib 41 may also be in a polygonal shape, a wavy shape, a broken line shape, or the like.

[0200] By providing the first reinforcing rib 41 to connect the first portion 1311 and the second portion 1312 , the first reinforcing rib 41 can strengthen the connection strength between the first portion 1311 and the second portion 1312 , thereby reducing the risk of the first connection portion 1313 being damaged.

[0201] In some embodiments, along the thickness direction of the first wall portion 131 , the first reinforcing rib 41 includes a first overlapping area 411 overlapping with the first part 1311 and a second overlapping area 412 overlapping with the second part 1312 , the first overlapping area 411 is connected to the first part 1311 , and the second overlapping area 412 is connected to the second part 1312 .

[0202] The first overlapping region 411 can be welded, bonded, or clamped to the first portion 1311; for example, the first overlapping region 411 is bonded to the first portion 1311. The second overlapping region 412 can be welded, bonded, or clamped to the first portion 1311; for example, the second overlapping region 412 is bonded to the second portion 1312.

[0203] In the above embodiment, by setting the first overlapping area 411 connected to the first part 1311 and the second overlapping area 412 connected to the second part 1312, it is convenient to connect the first reinforcing rib 41 with the first part 1311 and the second part 1312, thereby improving the structural strength of the first wall portion 131.

[0204] In some embodiments, the first overlapping region 411 is connected to the first portion 1311 by welding, and the second overlapping region 412 is connected to the second portion 1312 by welding.

[0205] There may be only one connection portion between the first overlapping area 411 and the first portion 1311, which is a welding point. Alternatively, there may be multiple connection portions between the first overlapping area 411 and the first portion 1311, which are arranged at intervals and are all welding points.

[0206] There may be only one connection portion between the second overlapping area 412 and the second portion 1312, which is a welding point. Alternatively, there may be multiple connection portions between the second overlapping area 412 and the second portion 1312, which are spaced apart and are all welding points.

[0207] By setting the first overlapping area 411 to be welded to the first part 1311 and the second overlapping area 412 to be welded to the second part 1312, the connection strength between the first reinforcing rib 41 and the first part 1311 and the second part 1312 is improved, and the risk of the first reinforcing rib 41 being separated from the first part 1311 and the second part 1312 is reduced.

[0208] In some embodiments, please refer to Figure 9 The first reinforcing rib 41 extends along a curved track.

[0209] The curved trajectory can be a wavy trajectory, a broken line trajectory, an arc trajectory, etc.

[0210] As an example, Figure 9 As shown, a first reinforcing rib 41 is provided on the surface of the first wall portion 131 facing away from the electrode assembly 2 , and the first reinforcing rib 41 is a wavy track.

[0211] By arranging the first reinforcing rib 41 to extend along a curved track, the length of the first reinforcing rib 41 can be extended, which is beneficial to improving the strength of the first wall portion 131 .

[0212] In some embodiments, the first reinforcing rib 41 includes a plurality of first overlapping regions 411 and / or a plurality of second overlapping regions 412 .

[0213] The first reinforcing rib 41 may include a plurality of first overlapping regions 411 ; or the first reinforcing rib 41 may include a plurality of second overlapping regions 412 .

[0214] As an example, Figure 9 As shown, the first reinforcing rib 41 includes two first overlapping regions 411 and a third second overlapping region 412 .

[0215] Multiple first overlapping areas 411 and / or multiple second overlapping areas 412 help the first reinforcing rib 41 to connect the first part 1311 and the second part 1312, thereby improving the connection strength between the first reinforcing rib 41 and the first part 1311 and the second part 1312, thereby improving the connection strength between the first part 1311 and the second part 1312.

[0216] In some embodiments, please refer to Figure 10 , Figure 10The structure of the battery cell 10 provided in some embodiments of the present application is schematic. The housing 11 is provided with an opening 11a at at least one end along the first direction Z. The first wall portion 131 is provided with a plurality of first reinforcing ribs 41 spaced apart along the first direction Z.

[0217] The opening 11 a may be provided at only one end of the housing 11 along the first direction Z; or the opening 11 a may be provided at both ends of the housing 11 along the first direction Z.

[0218] As an example, Figure 10 As shown, there are three first reinforcing ribs 41, which are spaced apart along the first direction Z. The first reinforcing rib 41 includes a first reinforcing portion 413 and a second reinforcing portion 414, which are arranged crosswise. The first reinforcing portion 413 and the second reinforcing portion 414 can be separately provided and connected, or they can be integrally formed.

[0219] By disposing a plurality of first reinforcing ribs 41 along the first direction Z, the plurality of first reinforcing ribs 41 can connect the first portion 1311 and the second portion 1312 , thereby enhancing the connection strength of the first connection portion 1313 .

[0220] In some embodiments, an opening 11a is provided at at least one end of the shell 11 along the first direction Z, and the dimension of the shell 11 along the first direction Z is L1; the first wall portion 131 is provided with a plurality of reinforcing ribs 4, and the plurality of reinforcing ribs 4 are arranged along the first direction Z, and the sum of the dimensions of the plurality of reinforcing ribs 4 along the first direction Z is L2, 0.01≤L2 / L1≤1.

[0221] In an embodiment where there are multiple reinforcing ribs 4 and the multiple reinforcing ribs 4 are spaced apart along the first direction Z, the size of the reinforcing rib 4 is the sum of the sizes of the multiple reinforcing ribs 4 .

[0222] As an example, Figure 10 As shown, the first wall portion 131 has three reinforcing ribs 4 , which are spaced apart along the first direction Z. The dimension of each reinforcing rib 4 along the first direction Z is L3 , where L3×3=L2 .

[0223] In an embodiment where there are multiple reinforcing ribs 4 and at least part of the multiple reinforcing ribs 4 overlap along the second direction Y, the area where the multiple reinforcing ribs 4 overlap along the second direction Y is the overlapping area, and the sum of the sizes of the multiple reinforcing ribs 4 located in the overlapping area is the size of the overlapping area along the first direction Z.

[0224] In some embodiments, please refer to Figure 7 and Figure 8The reinforcing rib 4 provided on the first wall portion 131 is a first reinforcing rib 41 . The first reinforcing rib 41 is provided on a side of the first wall portion 131 facing the electrode assembly 2 .

[0225] As an example, Figure 7 and 8 As shown, there are two electrode assemblies 2, which are stacked along the second direction Y. A recess 23 is provided between the two electrode assemblies 2 on one side near the first reinforcing rib 41, and at least a portion of the first reinforcing rib 41 is accommodated in the recess 23 to reduce interference between the electrode assembly 2 and the first reinforcing rib 41.

[0226] By disposing the first reinforcing rib 41 on the side of the first wall portion 131 facing the electrode assembly 2 , the space occupied by the battery cell 10 can be reduced, and the risk of interference between external components and the first reinforcing rib 41 can be reduced.

[0227] In some embodiments, please refer to Figure 11-13 , Figure 11 A schematic structural diagram of a battery cell 10 provided in some other embodiments of the present application; Figure 12 for Figure 11 BB cross-sectional view; Figure 13 for Figure 12 A partial enlarged view of area B in the middle. The end cap 12 is welded to at least one wall portion 13 of the housing 11 to form a second connecting portion 5. The wall portion 13 of the housing 11 welded to the end cap 12 is a third wall portion 133. Third wall portion 133 is provided with a reinforcing rib 4, which is a second reinforcing rib 42. In a projection plane perpendicular to the thickness direction of third wall portion 133, the orthographic projection of the second connecting portion 5 at least partially overlaps with the orthographic projection of the second reinforcing rib 42.

[0228] The end cover 12 and only one wall portion 13 of the shell 11 may be welded to form the second connection portion 5; or the end cover 12 and each wall portion 13 of the shell 11 may be welded to form multiple second connection portions 5, and the multiple second connection portions 5 may be connected or arranged at intervals.

[0229] The second reinforcing rib 42 may be located on the side of the third wall portion 133 facing away from the electrode assembly 2 ; or the second reinforcing rib 42 may be located on the side of the third wall portion 133 facing the electrode assembly 2 .

[0230] The orthographic projection of the second connecting portion 5 may partially overlap with the orthographic projection of the second reinforcing rib 42 in a projection plane perpendicular to the thickness direction of the third wall portion 133. Alternatively, the orthographic projection of the second connecting portion 5 may completely overlap with the orthographic projection of the second reinforcing rib 42 in a projection plane perpendicular to the thickness direction of the third wall portion 133.

[0231] As an example, Figure 11-13As shown, the second reinforcing rib 42 and the second connecting portion 5 are arranged along the third direction X (the thickness direction of the third wall portion 133 ), and in the projection plane perpendicular to the thickness direction of the third wall portion 133 , the orthographic projection of the second connecting portion 5 is located within the orthographic projection of the second reinforcing rib 42 .

[0232] In the above embodiment, in the projection plane perpendicular to the thickness direction of the third wall portion 133, the orthographic projection of the second connecting portion 5 and the orthographic projection of the second reinforcing rib 42 at least partially overlap, so that the second reinforcing rib 42 can be arranged close to the second connecting portion 5, thereby enhancing the connection strength between the end cover 12 and the shell 11, reducing the risk of the end cover 12 being separated from the shell 11, improving the structural strength of the battery cell 10, and improving the structural stability of the battery cell 10.

[0233] In some embodiments, the second reinforcing rib 42 is disposed on a side of the third wall portion 133 facing the electrode assembly 2 .

[0234] As an example, Figure 12 As shown, the second reinforcing rib 42 is located on the side of the third wall portion 133 facing the electrode assembly 2 .

[0235] By disposing the second reinforcing rib 42 on the side of the third wall portion 133 facing the electrode assembly 2 , the space occupied by the battery cell 10 can be reduced, and the risk of interference between external components and the second reinforcing rib 42 can be reduced.

[0236] In some embodiments, the third wall portion 133 may be the first wall portion 131; the third wall portion 133 may be the second wall portion 132; the third wall portion 133 and the first wall portion 131 may be arranged opposite to each other along the third direction X; or the third wall portion 133 and the second wall portion 132 may be arranged opposite to each other along the second direction Y.

[0237] In some embodiments, please refer to Figure 14 , Figure 14 Schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application (showing that the second wall portion 132 is provided with a reinforcing rib 4). The multiple wall portions 13 include a second wall portion 132 arranged along the circumference of the opening 11a. The second wall portion 132 is the wall portion 13 with the largest outer surface area in the housing 11 and is provided with a reinforcing rib 4.

[0238] As an example, the battery cell 10 is a square-shell battery cell, and the shell 11 has a first wall portion 131 and a third wall portion 133 arranged opposite to each other along the third direction X, and a second wall portion 132 located between the first wall portion 131 and the third wall portion 133 along the third direction X. The outer surface area of ​​the second wall portion 132 is greater than the outer surface area of ​​the first wall portion 131, and the outer surface area of ​​the second wall portion 132 is greater than the outer surface area of ​​the third wall portion 133.

[0239] By providing the reinforcing ribs 4 on the second wall portion 132 , the reinforcing ribs 4 can enhance the strength of the second wall portion 132 and improve the deformation resistance of the second wall portion 132 , thereby improving the structural stability of the battery cell 10 .

[0240] In some embodiments, the second wall portion 132 is provided with a plurality of reinforcing ribs 4 , and the plurality of reinforcing ribs 4 include a third reinforcing rib 43 and a fourth reinforcing rib 44 , and the third reinforcing rib 43 and the fourth reinforcing rib 44 are cross-arranged.

[0241] There may be one or more third reinforcing ribs 43. There may be one or more fourth reinforcing ribs 44.

[0242] The third reinforcing rib 43 and the fourth reinforcing rib 44 may be separately provided and connected; or the third reinforcing rib 43 and the fourth reinforcing rib 44 may be integrally formed.

[0243] The third reinforcing rib 43 and the fourth reinforcing rib 44 may be located on the side of the second wall portion 132 facing the electrode assembly 2 ; or the third reinforcing rib 43 and the fourth reinforcing rib 44 may be located on the side of the second wall portion 132 facing away from the electrode assembly 2 .

[0244] As an example, Figure 14 As shown, the third reinforcing rib 43 extends along the third direction X, and there is one third reinforcing rib 43. The fourth reinforcing rib 44 extends along the first direction Z, and there are two fourth reinforcing ribs 44. The two fourth reinforcing ribs 44 are spaced apart along the third direction X, and the one third reinforcing rib 43 and the two fourth reinforcing ribs 44 are arranged crosswise.

[0245] In the above embodiment, the third reinforcing ribs 43 and the fourth reinforcing ribs 44 are cross-arranged, which can enhance the structural strength of the third reinforcing ribs 43 and the fourth reinforcing ribs 44, thereby enhancing the reinforcing effect of the reinforcing ribs 4 on the second wall portion 132 and improving the structural strength of the second wall portion 132.

[0246] In some embodiments, the third reinforcing rib 43 and the fourth reinforcing rib 44 are located on a side of the second wall portion 132 facing away from the electrode assembly 2 .

[0247] As an example, Figure 14 As shown, the third reinforcing rib 43 and the fourth reinforcing rib 44 are cross-arranged and located on the side of the second wall portion 132 away from the electrode assembly 2 .

[0248] By arranging the third reinforcing rib 43 and the fourth reinforcing rib 44 on the side of the second wall portion 132 away from the electrode assembly 2, when the battery cell 10 and the external components are arranged along the thickness direction of the second wall portion 132, the third reinforcing rib 43 and the fourth reinforcing rib 44 can increase the distance between the second wall portion 132 of the battery cell 10 and the external components, thereby improving the heat dissipation effect of the battery cell 10.

[0249] In some embodiments, please refer to Figure 15-17 , Figure 15 A schematic structural diagram of a battery cell 10 provided in some embodiments of the present application (the end cap 12 is provided with a reinforcing rib 4); Figure 16 for Figure 15 CC cross-sectional view; Figure 17 for Figure 16 A partial enlarged view of the middle C area. The housing 1 includes a shell 11 and an end cover 12. One wall portion 13 is the end cover 12. The shell 11 has an opening 11a, and the end cover 12 covers the opening 11a. The end cover 12 is provided with a reinforcing rib 4.

[0250] The reinforcing rib 4 may be provided on the side of the end cover 12 facing the electrode assembly 2 , or may be provided on the side of the end cover 12 facing away from the electrode assembly 2 .

[0251] When the housing 1 has two end covers 12 , either one of the end covers 12 may have the reinforcing rib 4 , or both of the end covers 12 may be provided with the reinforcing rib 4 .

[0252] The end cover 12 may be provided with only one reinforcing rib 4. The end cover 12 may also be provided with multiple reinforcing ribs 4; the multiple reinforcing ribs 4 may be arranged crosswise or at intervals.

[0253] In the above embodiment, the end cover 12 is provided with the reinforcing rib 4 to enhance the strength of the end cover 12 and improve the deformation resistance of the end cover 12 , thereby improving the structural stability of the battery cell 10 .

[0254] In some embodiments, the end cap 12 has a thickness of 0.5 mm to 5 mm.

[0255] The thickness of the end cap 12 may be any one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm, or a range of values ​​between any two of them.

[0256] By setting the thickness of the end cover 12 to 0.5 mm-5 mm, the structural strength of the end cover 12 can be improved, which helps to improve the connection stability between the end cover 12 and the shell 11.

[0257] In some embodiments, the end cover 12 is welded to at least one wall portion 13 in the shell 11 to form a second connecting portion 5, and the reinforcing rib 4 provided on the end cover 12 is a fifth reinforcing rib 45. In a projection plane perpendicular to the thickness direction of the end cover 12, the orthographic projection of the second connecting portion 5 at least partially overlaps with the orthographic projection of the fifth reinforcing rib 45.

[0258] The fifth reinforcing rib 45 may be located on the side of the end cover 12 facing away from the electrode assembly 2 ; or the fifth reinforcing rib 45 may be located on the side of the end cover 12 facing the electrode assembly 2 .

[0259] It is possible that a portion of the orthographic projection of the second connecting portion 5 overlaps with a portion of the orthographic projection of the fifth reinforcing rib 45 in a projection plane perpendicular to the first direction Z. It is also possible that a portion of the orthographic projection of the second connecting portion 5 completely overlaps with the orthographic projection of the fifth reinforcing rib 45 in a projection plane perpendicular to the first direction Z.

[0260] As an example, Figure 15-17 As shown, the fifth reinforcing rib 45 and the second connecting portion 5 are arranged along the first direction Z (the thickness direction of the third wall portion 133 ), and in the projection plane perpendicular to the first direction Z, the orthographic projection of the second connecting portion 5 is located within the orthographic projection of the fifth reinforcing rib 45 .

[0261] In the above embodiment, in the projection plane perpendicular to the thickness direction of the end cover 12, the orthographic projection of the second connecting part 5 and the orthographic projection of the fifth reinforcing rib 45 at least partially overlap, so that the fifth reinforcing rib 45 can be arranged close to the second connecting part 5, thereby enhancing the connection strength of the second connecting part 5.

[0262] In some embodiments, the fifth reinforcing rib 45 is disposed on a side of the end cover 12 facing the electrode assembly 2 .

[0263] As an example, Figure 16 As shown, the fifth reinforcing rib 45 is located on the side of the end cover 12 facing the electrode assembly 2 .

[0264] By disposing the fifth reinforcing rib 45 on the side of the end cover 12 facing the electrode assembly 2 , the space occupied by the battery cell 10 can be reduced, thereby reducing the risk of external components interfering with the fifth reinforcing rib 45 .

[0265] In some embodiments, please refer to Figure 18 , Figure 18 Schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application (showing the sixth and seventh reinforcing ribs 46 and 47). The end cap 12 is provided with a plurality of reinforcing ribs 4, including the sixth and seventh reinforcing ribs 46 and 47, which are arranged crosswise.

[0266] There may be one or more sixth reinforcing ribs 46. There may be one or more seventh reinforcing ribs 47.

[0267] The sixth reinforcing rib 46 and the seventh reinforcing rib 47 may be separately provided and connected; or the sixth reinforcing rib 46 and the seventh reinforcing rib 47 may be integrally formed.

[0268] The sixth reinforcing rib 46 and the seventh reinforcing rib 47 may be located on the side of the end cover 12 facing the electrode assembly 2 ; or the sixth reinforcing rib 46 and the seventh reinforcing rib 47 may be located on the side of the end cover 12 facing away from the electrode assembly 2 .

[0269] As an example, Figure 18 As shown, the sixth reinforcing rib 46 extends along the third direction X, and there is one sixth reinforcing rib 46. The seventh reinforcing rib 47 extends along the second direction Y, and there are two seventh reinforcing ribs 47. The two seventh reinforcing ribs 47 are spaced apart along the third direction X, and the one sixth reinforcing rib 46 and the two seventh reinforcing ribs 47 are arranged crosswise.

[0270] In the above embodiment, the cross arrangement of the sixth reinforcing rib 46 and the seventh reinforcing rib 47 can enhance the connection strength between the sixth reinforcing rib 46 and the seventh reinforcing rib 47 , thereby facilitating the structural strength of the end cover 12 and improving the structural stability of the battery cell 10 .

[0271] In some embodiments, the sixth reinforcing rib 46 and the seventh reinforcing rib 47 are located on a side of the end cap 12 facing the electrode assembly 2 .

[0272] The sixth reinforcing rib 46 and the seventh reinforcing rib 47 are located between the end cover 12 and the electrode assembly 2. The sixth reinforcing rib 46 and the seventh reinforcing rib 47 support the electrode assembly 2. In an embodiment where the end cover 12 is provided with a pressure relief mechanism 6, the sixth reinforcing rib 46 and the seventh reinforcing rib 47 can form a channel between the electrode assembly 2 and the pressure relief mechanism 6, which is beneficial for the pressure relief mechanism 6 to release the internal pressure of the battery cell 10.

[0273] By arranging the sixth and seventh reinforcing ribs 46 and 47 on the side of the end cap 12 facing the electrode assembly 2 , the space occupied by the battery cell 10 can be reduced, thereby reducing the risk of external components interfering with the sixth and seventh reinforcing ribs 46 and 47 .

[0274] In some embodiments, please refer to Figure 19 and Figure 20 , Figure 19 A schematic structural diagram of a battery cell 10 provided in some embodiments of the present application (showing a first electrode terminal 31 and a second electrode terminal 32); Figure 20 for Figure 19DD cross-sectional view. The end cap 12 is provided with a first electrode terminal 31 and a second electrode terminal 32 of opposite polarity. The first electrode terminal 31 and the second electrode terminal 32 are spaced apart along the third direction X. The housing 11 has a first wall portion 131 and a third wall portion 133 arranged opposite each other along the third direction X. Along the third direction X, the first wall portion 131 is closer to the first electrode terminal 31 than to the second electrode terminal 32, and the third wall portion 133 is closer to the second electrode terminal 32 than to the first electrode terminal 31. The reinforcing rib 4 provided on the end cap 12 is an eighth reinforcing rib 48. Along the third direction X, the eighth reinforcing rib 48 is provided between the first electrode terminal 31 and the first wall portion 131, and / or between the second electrode terminal 32 and the third wall portion 133.

[0275] The eighth reinforcing rib 48 may be provided only between the first electrode terminal 31 and the first wall portion 131; the eighth reinforcing rib 48 may be provided only between the second electrode terminal 32 and the third wall portion 133; the eighth reinforcing rib 48 may be provided both between the first electrode terminal 31 and the first wall portion 131 and between the second electrode terminal 32 and the third wall portion 133.

[0276] The eighth reinforcing rib 48 may be disposed on a side of the end cover 12 facing the electrode assembly 2 , or may be disposed on a side of the end cover 12 facing away from the electrode assembly 2 .

[0277] In the above embodiment, the eighth reinforcing rib 48 can enhance the strength of the end cover 12 , thereby reducing the risk of deformation of the end cover 12 affecting the sealing performance of the battery cell 10 .

[0278] In some embodiments, the end cap 12 is provided with a first electrode terminal 31 and a second electrode terminal 32 of opposite polarity, and the first electrode terminal 31 and the second electrode terminal 32 are spaced apart along the third direction X. The reinforcing rib 4 provided on the end cap 12 is an eighth reinforcing rib 48 , and the eighth reinforcing rib 48 is provided between the first electrode terminal 31 and the second electrode terminal 32 along the third direction X.

[0279] Only one eighth reinforcing rib 48 may be provided between the first electrode terminal 31 and the second electrode terminal 32 , or a plurality of eighth reinforcing ribs 48 may be provided.

[0280] By disposing the eighth reinforcing rib 48 between the first electrode terminal 31 and the second electrode terminal 32 , the eighth reinforcing rib 48 can enhance the structural strength of the end plate and improve the structural stability of the battery cell 10 .

[0281] In some embodiments, the end cover 12 is further provided with a pressure relief mechanism 6 , and there are multiple eighth reinforcing ribs 48 . Along the third direction X, eighth reinforcing ribs 48 are provided between the pressure relief mechanism 6 and the first electrode terminal 31 and between the pressure relief mechanism 6 and the second electrode terminal 32 .

[0282] As an example, Figure 19 and 20 As shown, an eighth reinforcing rib 48 is provided between the first wall portion 131 and the first electrode terminal 31, an eighth reinforcing rib 48 is provided between the third wall portion 133 and the second electrode terminal 32, an eighth reinforcing rib 48 is provided between the first electrode terminal 31 and the pressure relief mechanism 6, and an eighth reinforcing rib 48 is provided between the second electrode terminal 32 and the pressure relief mechanism 6.

[0283] By providing the eighth reinforcing ribs 48 on both sides of the pressure relief mechanism 6 , the structural strength of the end cover 12 around the pressure relief mechanism 6 can be enhanced, thereby reducing the risk of the end cover 12 being damaged before the pressure relief mechanism 6 .

[0284] An embodiment of the present application provides a battery device 100 , comprising a battery cell 10 provided in any one of the above embodiments.

[0285] An embodiment of the present application provides an electrical device, including the battery cell 10 provided by any one of the above embodiments or the battery device 100 provided by any one of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0286] Please continue to refer to Figure 6-Figure 8 , an embodiment of the present application provides a battery cell 10, and the battery cell 10 includes a shell 1 and an electrode assembly 2. The shell 1 includes a plurality of wall portions 13, and the plurality of wall portions 13 enclose a receiving space 11b. The electrode assembly 2 is received in the receiving space 11b. The shell 11 is formed by integrally bending a plate, and the thickness of the plate is 0.1mm-0.5mm. The first wall portion 131 includes a first part 1311 and a second part 1312, and the first part 1311 and the second part 1312 are welded to form a first connecting portion 1313, and the reinforcing rib 4 provided on the first wall portion 131 is a first reinforcing rib 41. In a projection plane perpendicular to the thickness direction of the first wall portion 131, the orthographic projection of the first connecting portion 1313 is located within the orthographic projection of the first reinforcing rib 41. Among them, the first part 1311 and the second part 1312 are both provided with a first reinforcing rib 41, and the first reinforcing rib 41 on the first part 1311 and the first reinforcing rib 41 on the second part 1312 are the two ends of the plate, and the first connecting part 1313 extends along the third direction X to the first reinforcing rib 41.

[0287] The reinforcement ribs 4 are provided to increase the strength of the wall portion 13. The first reinforcement ribs 41 connect the first portion 1311 and the second portion 1312, thereby increasing the connection strength between the first portion 1311 and the second portion 1312, reducing the risk of damage to the first connection portion 1313, and improving the strength of the housing 1, thereby enhancing the structural stability of the battery cell 10.

[0288] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0289] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery cell, characterized in that: include: The housing comprises a plurality of wall portions, wherein the plurality of wall portions enclose an accommodating space; an electrode assembly, accommodated in the accommodation space; wherein at least one of the wall portions is provided with reinforcing ribs; The housing includes a shell and an end cover, one of the wall portions is the end cover, the shell has an opening, the end cover covers the opening, and at least one of the wall portions in the shell is provided with the reinforcing rib; Multiple wall portions include a first wall portion, the first wall portion is formed on the shell, the first wall portion is provided with the reinforcing rib, the first wall portion includes a first part and a second part, the first part and the second part are welded together to form a first connection portion, the reinforcing rib provided on the first wall portion is a first reinforcing rib, and in a projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the first connection portion at least partially overlaps with the orthographic projection of the first reinforcing rib.

2. The battery cell according to claim 1, wherein The thickness of the wall portion in the shell is 0.1 mm to 0.5 mm.

3. The battery cell according to claim 1, wherein The plurality of wall portions further include a second wall portion, the second wall portion and the first wall portion are adjacently arranged along the circumference of the opening, the second wall portion is formed in the shell, and the outer surface area of ​​the first wall portion is smaller than the outer surface area of ​​the second wall portion.

4. The battery cell according to claim 3, wherein: Along the thickness direction of the first wall portion, the size of the reinforcing rib is 0.1 mm-1 mm.

5. The battery cell according to claim 3, wherein: The opening is provided at at least one end of the shell along the first direction, and the size of the shell along the first direction is L1; The first wall portion is provided with one reinforcing rib, and the dimension of the reinforcing rib along the first direction is L2; ​​or the first wall portion is provided with multiple reinforcing ribs, and the multiple reinforcing ribs are arranged along the first direction, and the sum of the dimensions of the multiple reinforcing ribs along the first direction is L2; ​​0.01≤L2 / L1≤1.

6. The battery cell according to claim 3, wherein: The shell is formed by integrally bending a plate.

7. The battery cell according to claim 6, wherein: The first portion and the second portion are both provided with the first reinforcing ribs.

8. The battery cell according to claim 7, wherein: The opening is provided at at least one end of the housing along the first direction; The first reinforcing ribs extend along the first direction. The first reinforcing ribs arranged on the first part and the first reinforcing ribs arranged on the second part are stacked along the second direction. The first direction, the second direction and the thickness direction of the first wall portion are perpendicular to each other.

9. The battery cell according to claim 8, wherein: The first reinforcing rib provided on the first portion is engaged with the first reinforcing rib provided on the second portion.

10. The battery cell according to claim 7, wherein: The first reinforcing rib provided on the first portion and the first reinforcing rib provided on the second portion are respectively two end portions of the plate.

11. The battery cell according to claim 7, wherein: Along the thickness direction of the first wall portion, the first connecting portion extends to the first reinforcing rib.

12. The battery cell according to claim 6, wherein: The first reinforcing rib connects the first portion and the second portion.

13. The battery cell according to claim 12, wherein: Along the thickness direction of the first wall portion, the first reinforcing rib includes a first overlapping area overlapping with the first portion and a second overlapping area overlapping with the second portion, the first overlapping area is connected to the first portion, and the second overlapping area is connected to the second portion.

14. The battery cell according to claim 13, wherein: The first overlapping region is connected to the first portion by welding, and the second overlapping region is connected to the second portion by welding.

15. The battery cell according to claim 13, wherein: The first reinforcing rib extends along a curved track.

16. The battery cell according to claim 15, wherein: The first reinforcing rib includes a plurality of the first overlapping regions and / or a plurality of the second overlapping regions.

17. The battery cell according to claim 12, wherein: The opening is provided at at least one end of the shell along the first direction, and the first wall portion is provided with a plurality of the first reinforcing ribs, which are spaced apart along the first direction.

18. The battery cell according to claim 3, wherein: The reinforcing rib provided on the first wall portion is a first reinforcing rib, and the first reinforcing rib is provided on a side of the first wall portion facing the electrode assembly.

19. The battery cell according to claim 1, wherein: The end cover is welded to at least one of the wall portions in the shell to form a second connecting portion, the wall portion in the shell welded to the end cover is a third wall portion, the third wall portion is provided with the reinforcing rib, and the reinforcing rib provided on the third wall portion is a second reinforcing rib, and in a projection plane perpendicular to the thickness direction of the third wall portion, the orthographic projection of the second connecting portion at least partially overlaps with the orthographic projection of the second reinforcing rib.

20. The battery cell according to claim 19, wherein The second reinforcing rib is arranged on a side of the third wall portion facing the electrode assembly.

21. The battery cell according to claim 1, wherein The plurality of wall portions include a second wall portion provided along the circumference of the opening, the second wall portion being the wall portion with the largest outer surface area in the shell, and the second wall portion is provided with reinforcing ribs.

22. The battery cell according to claim 21, wherein The second wall portion is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs include a third reinforcing rib and a fourth reinforcing rib, and the third reinforcing rib and the fourth reinforcing rib are cross-arranged.

23. The battery cell according to claim 22, wherein: The third reinforcing rib and the fourth reinforcing rib are located on a side of the second wall portion facing away from the electrode assembly.

24. The battery cell according to any one of claims 1 to 23, characterized in that: The housing comprises a shell and an end cover, one of the wall portions is the end cover, the shell has an opening, and the end cover covers the opening; The end cover is provided with the reinforcing rib.

25. The battery cell according to claim 24, wherein: The thickness of the end cover is 0.5mm-5mm.

26. The battery cell according to claim 24, wherein: The end cover is welded to at least one of the wall portions in the shell to form a second connection portion, and the reinforcing rib arranged on the end cover is a fifth reinforcing rib. In a projection plane perpendicular to the thickness direction of the end cover, the orthographic projection of the second connection portion at least partially overlaps with the orthographic projection of the fifth reinforcing rib.

27. The battery cell according to claim 26, wherein: The fifth reinforcing rib is arranged on a side of the end cover facing the electrode assembly.

28. The battery cell according to claim 24, wherein: The end cover is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs include a sixth reinforcing rib and a seventh reinforcing rib, and the sixth reinforcing rib and the seventh reinforcing rib are cross-arranged.

29. The battery cell according to claim 28, wherein The sixth reinforcing rib and the seventh reinforcing rib are located on a side of the end cover facing the electrode assembly.

30. The battery cell according to claim 24, wherein The end cap is provided with a first electrode terminal and a second electrode terminal with opposite polarities, the first electrode terminal and the second electrode terminal being spaced apart along a third direction, the housing having a first wall portion and a third wall portion oppositely disposed along the third direction, the first wall portion being closer to the first electrode terminal than to the second electrode terminal, and the third wall portion being closer to the second electrode terminal than to the first electrode terminal; The reinforcing rib provided on the end cover is an eighth reinforcing rib. Along the third direction, an eighth reinforcing rib is provided between the first electrode terminal and the first wall portion, and / or an eighth reinforcing rib is provided between the second electrode terminal and the third wall portion.

31. The battery cell according to claim 24, wherein The end cap is provided with a first electrode terminal and a second electrode terminal with opposite polarities, and the first electrode terminal and the second electrode terminal are spaced apart along the third direction; The reinforcing rib provided on the end cover is an eighth reinforcing rib, and the eighth reinforcing rib is provided between the first electrode terminal and the second electrode terminal along the third direction.

32. The battery cell according to claim 31, wherein The end cover is further provided with a pressure relief mechanism, and there are multiple eighth reinforcing ribs. Along the third direction, the eighth reinforcing ribs are provided between the pressure relief mechanism and the first electrode terminal and between the pressure relief mechanism and the second electrode terminal.

33. A battery device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 32.

34. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 32 or the battery device according to claim 33, wherein the battery cell is used to provide electrical energy to the electrical device.

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