Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, an electrode assembly, and an insulator. The housing has a first wall. The electrode assembly is housed within the housing. The insulating part wraps the outer side of the shell and covers the outer surface of the first wall. Wherein the insulating part is provided with a first hollow-out area, the first hollow-out area is located on the side, away from the electrode assembly, of the first wall, an exposed area is formed in the position, corresponding to the first hollow-out area, of the outer surface of the first wall, and the exposed area is provided with a groove and / or a protrusion. According to the technical scheme, the reliability of the battery can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, an electrode assembly, and an insulating member. The housing has a first wall. The electrode assembly is accommodated in the housing. The insulating member is coated on the outside of the housing and covers the outer surface of the first wall. The insulating member is provided with a first hollow area, the first hollow area is located on the side of the first wall away from the electrode assembly, and the outer surface of the first wall forms an exposed area at a position corresponding to the first hollow area, and the exposed area is provided with a groove and / or a protrusion.

[0007] According to the technical solution of the embodiment of the present application, the battery cell is connected to the box body through an adhesive layer to form a battery device. By arranging grooves and / or protrusions in the exposed area, the friction between the exposed area and the adhesive layer is increased, the risk of the adhesive layer falling off from the exposed area is reduced, and the bonding reliability between the adhesive layer and the exposed area is improved, thereby improving the reliability of the connection between the battery cell and the box body and improving the reliability of the battery device.

[0008] In some embodiments, the groove includes a first groove, the exposed area includes a plurality of first grooves, and the plurality of first grooves form a bonding area.

[0009] The technical solution of the embodiment of the present application provides a plurality of first grooves for connecting with the adhesive layer, further improving the reliability of the bonding between the adhesive layer and the exposed area, thereby improving the reliability of the battery cell connection box and improving the reliability of the battery device.

[0010] In some embodiments, the opening of the first groove is circular, and a diameter R1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0011] In the technical solution of the embodiment of the present application, the opening diameter of the first groove meets the above conditions, which is easy to process and improves the bonding reliability between the bonding layer and the exposed area at the same time.

[0012] In some embodiments, the diameter R1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0013] In the technical solution of the embodiment of the present application, the opening diameter of the first groove meets the above conditions, which is easy to process and further improves the bonding reliability between the bonding layer and the exposed area at the same time.

[0014] In some embodiments, the opening of the first groove is square, and the side length A1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0015] In the technical solution of the embodiment of the present application, the side length of the opening of the first groove meets the above conditions, which is easy to process and improves the bonding reliability between the bonding layer and the exposed area at the same time.

[0016] In some embodiments, the side length A1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0017] In the technical solution of the embodiment of the present application, the side length of the opening of the first groove meets the above conditions, which is easy to process and further improves the bonding reliability between the bonding layer and the exposed area at the same time.

[0018] In some embodiments, in the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

[0019] In the technical solution of the embodiment of the present application, the depth of the first groove meets the above conditions, reducing the influence on the structural strength of the first wall and improving the bonding reliability between the bonding layer and the exposed area at the same time.

[0020] In some embodiments, in the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

[0021] In the technical solution of the embodiment of the present application, the depth of the first groove meets the above conditions, further reducing the influence on the structural strength of the first wall and improving the bonding reliability between the bonding layer and the exposed area at the same time.

[0022] In some embodiments, the groove includes a second groove, the second groove includes a first groove segment and a second groove segment, the first groove segment and the second groove segment are arranged along the thickness direction of the first wall, and the first groove segment is closer to the outer surface of the first wall than the second groove segment. Wherein, the diameter of the first groove segment is smaller than the diameter of the second groove segment.

[0023] In the technical solution of the embodiment of the present application, the adhesive layer enters the second groove section from the first groove section. The diameter of the first groove section of the second groove is smaller than that of the second groove section, reducing the risk of the adhesive layer falling off from the second groove section and improving the bonding reliability between the adhesive layer and the exposed area.

[0024] In some embodiments, the second groove includes a third groove section. The third groove section, the first groove section, and the second groove section are arranged in sequence along the thickness direction of the first wall. One end of the third groove section extends to the outer surface of the first wall, and the other end communicates with the first groove section. Among them, the diameter of the first groove section is smaller than that of the third groove section.

[0025] In the technical solution of the embodiment of the present application, the adhesive layer passes through the third groove section, the first groove section, and then enters the second groove section in sequence. The diameter of the first groove section of the second groove is smaller than that of the second groove section, and the diameter of the first groove section of the second groove is smaller than that of the third groove section, reducing the risk of the adhesive layer falling off from the second groove section. The adhesive layer is bonded through the third groove section, increasing the bonding area and improving the bonding reliability between the adhesive layer and the exposed area.

[0026] In some embodiments, the diameter R2 of the first groove section is greater than or equal to 1 mm and less than or equal to 3 mm.

[0027] In the technical solution of the embodiment of the present application, the diameter of the first groove section meets the above conditions. While being easy to process, it reduces the risk of the adhesive layer falling off from the second groove section and improves the bonding reliability between the adhesive layer and the exposed area.

[0028] In some embodiments, the diameter R3 of the second groove section is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0029] In the technical solution of the embodiment of the present application, the diameter of the second groove section meets the above conditions. While being easy to process, it reduces the risk of the adhesive layer falling off from the second groove section and improves the bonding reliability between the adhesive layer and the exposed area.

[0030] In some embodiments, the diameter R4 of the third groove section is greater than or equal to 2 mm and less than or equal to 4 mm.

[0031] In the technical solution of the embodiment of the present application, the diameter of the third groove section meets the above conditions. While increasing the bonding area, it reduces the risk of the adhesive layer falling off from the exposed area and improves the bonding reliability between the adhesive layer and the exposed area.

[0032] In some embodiments, in the thickness direction of the first wall, the depth D2 of the second groove is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0033] In the technical solution of the embodiment of the present application, the depth of the second groove meets the above conditions, reducing the risk of the adhesive layer exposed area falling off, while reducing the risk of affecting the structural strength of the first wall, and improving the bonding reliability between the adhesive layer and the exposed area.

[0034] In some embodiments, in the thickness direction of the first wall, the depth D3 of the first groove segment is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

[0035] In the technical solution of the embodiment of the present application, the depth of the first groove segment meets the above conditions, which is easy to process, while reducing the risk of the adhesive layer falling off from the second groove segment, and improving the bonding reliability between the adhesive layer and the exposed area.

[0036] In some embodiments, in the thickness direction of the first wall, the depth D4 of the second groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0037] In the technical solution of the embodiment of the present application, the depth of the second groove segment meets the above conditions, which is easy to process, while reducing the risk of the adhesive layer falling off from the second groove segment, and improving the bonding reliability between the adhesive layer and the exposed area.

[0038] In some embodiments, in the thickness direction of the first wall, the depth D5 of the third groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0039] In the technical solution of the embodiment of the present application, the depth of the third groove segment meets the above conditions, which is easy to process, while reducing the risk of the adhesive layer falling off from the exposed area, and improving the bonding reliability between the adhesive layer and the exposed area.

[0040] In some embodiments, the housing further includes a second wall and a side wall. Along the thickness direction of the first wall, the second wall is disposed opposite to the first wall, and the side wall surrounds the first wall and the second wall. The insulating member includes a first insulating member and a second insulating member which are separately arranged. The first insulating member covers a part of the outer surface of the first wall, and the second insulating member covers at least a part of the outer surface of the second wall and at least a part of the outer surface of the side wall.

[0041] In the technical solution of the embodiment of the present application, by setting the insulator as a separately arranged first insulating member and second insulating member, the first insulating member is a structure covering the first wall, and the second insulating member is a structure covering the side wall and the second wall, so that the first insulating member and the second insulating member of the insulating member are respectively arranged corresponding to the first wall of the housing and the second wall and the side wall of the housing, which is beneficial to reducing the assembly difficulty between the insulating member and the housing.

[0042] In some embodiments, the second insulating member has a flanging portion, the flanging portion is arranged along the circumferential direction of the first wall and is located on the outer surface of the first wall, and the flanging portion and the edge of the first insulating member jointly enclose a first hollow area.

[0043] In the technical solution of the embodiment of the present application, the second insulating member has a flanging portion disposed along the circumference of the first wall on the first wall and located at the edge of the first wall, so that the edge of the first insulating member disposed on the first wall and a part of the flanging portion jointly enclose a first hollowed-out area to form an exposed area on the first wall. For a battery cell adopting such a structure, on the one hand, there is no need to set the first insulating member to have a through-hole structure, which is beneficial to improving the overall structural strength of the first insulating member. On the other hand, it is beneficial to control the size and dimensions of the first hollowed-out area.

[0044] In some embodiments, the battery cell further includes an electrode terminal, and the electrode terminal is disposed on the first wall. The insulating member is provided with a second hollowed-out area, and the second hollowed-out area is spaced from the first hollowed-out area, and the electrode terminal passes through the second hollowed-out area.

[0045] In the technical solution of the embodiment of the present application, the electrode terminal is disposed on the first wall, and the insulating member is provided with a second hollowed-out area through which the electrode terminal passes at a position corresponding to the electrode terminal. By spacing the second hollowed-out area from the first hollowed-out area, on the one hand, the exposed area formed on the first wall corresponding to the first hollowed-out area can be spaced from the electrode terminal to reduce the interference effect between the exposed area and the electrode terminal when the exposed area is connected to an external component.

[0046] In some embodiments, the housing includes a housing body and an end cover. The housing body includes a bottom wall and a plurality of side walls. The bottom wall and the end cover are disposed opposite to each other in the thickness direction of the first wall. The plurality of side walls surround the bottom wall. One end of the plurality of side walls is connected to the bottom wall, and the other end forms an opening, and the end cover closes the opening, and the end cover is the first wall.

[0047] In the technical solution of the embodiment of the present application, the end cover is the first wall, which increases the friction between the end cover and the adhesive layer, reduces the risk of the adhesive layer peeling off from the end cover, improves the bonding reliability between the adhesive layer and the end cover, thereby improving the reliability of the connection between the end cover and the box body, and improving the reliability of the battery device.

[0048] In a second aspect, the present application further provides a battery device. The battery device includes a box body, an adhesive layer, a connecting component, and the battery cell according to any one of the embodiments in the first aspect. The battery cell is disposed in the box body. The adhesive layer is disposed in the exposed area. The connecting component is disposed in the box body, and at least one side of the connecting component is connected to the adhesive layer in the thickness direction of the first wall to connect a plurality of battery cells.

[0049] In the technical solution of the embodiment of the present application, the adhesive layer is disposed in the exposed area, thereby connecting the battery cell and the connecting component, improving the reliability of the connection between the battery cell and the box body, and improving the reliability of the battery device.

[0050] In some embodiments, the exposed area is provided with a groove, and at least a part of the adhesive layer is located in the groove.

[0051] In the technical solution of the embodiment of the present application, the adhesive layer is disposed in the groove, reducing the risk of the adhesive layer peeling off from the exposed area, improving the reliability of the battery cell connecting the box body, and improving the reliability of the battery device.

[0052] In some embodiments, the exposed area is provided with a protrusion, and the protrusion is completely embedded in the adhesive layer.

[0053] In the technical solution of the embodiment of the present application, the protrusion is embedded in the adhesive layer, reducing the risk of the adhesive layer peeling off from the exposed area, improving the reliability of the battery cell connecting the box body, and improving the reliability of the battery device.

[0054] In some embodiments, the battery device further includes a connection layer. In the thickness direction of the first wall, the connection layer connects the exposed area and the adhesive layer, and the material of the connection layer is a coupling agent.

[0055] In the technical solution of the embodiment of the present application, the coupling agent has the properties of being affinity for the adhesive layer and affinity for the metal. The outer shell of the battery cell is metal, and the connection layer is a coupling agent. By connecting the adhesive layer and the exposed area through the connection layer, the risk of the adhesive layer peeling off from the exposed area is reduced, the reliability of the battery cell connecting the box body is improved, and the reliability of the battery device is improved.

[0056] In a third aspect, the present application further provides an electrical device, including the battery cell of any one of the embodiments in the first aspect or the battery device of any one of the embodiments in the second aspect, and the battery cell or the battery device is used to provide electrical energy for the electrical device.

[0057] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0059] Figure 1 It is a schematic structural diagram of a vehicle provided for some embodiments of the present application;

[0060] Figure 2 It is an exploded view of a battery device provided for some embodiments of the present application;

[0061] Figure 3 It is an exploded view of a battery cell provided for some embodiments of the present application;

[0062] Figure 4Schematic diagram of the battery cell provided by some embodiments of the present application;

[0063] Figure 5 Cross-sectional view of the first wall provided by some embodiments of the present application;

[0064] Figure 6 Cross-sectional view of the first wall provided by some other embodiments of the present application;

[0065] Figure 7 Cross-sectional view of the first wall provided by some further embodiments of the present application;

[0066] Figure 8 Schematic diagram of the exposed area provided by some embodiments of the present application;

[0067] Figure 9 Schematic diagram of the exposed area provided by some other embodiments of the present application;

[0068] Figure 10 Schematic diagram of the second groove provided by some embodiments of the present application;

[0069] Figure 11 Schematic diagram of the second groove provided by some other embodiments of the present application;

[0070] Figure 12 Schematic diagram of the battery cell provided by some other embodiments of the present application;

[0071] Figure 13 Schematic diagram of the internal structure of the battery device provided by some embodiments of the present application;

[0072] Figure 14 Schematic diagram of the connection between the exposed area and the connecting component provided by some embodiments of the present application;

[0073] Figure 15 Schematic diagram of the connection between the exposed area and the connecting component provided by some other embodiments of the present application;

[0074] Figure 16 Schematic diagram of the connection between the exposed area and the connecting component provided by some further embodiments of the present application.

[0075] Icon: 1 - battery cell; 10 - housing; 11 - first wall; 111 - exposed area; 1111 - groove; 1112 - protrusion; 1113 - first groove; 11131 - bonding area; 1114 - second groove; 1115 - first groove segment; 1116 - second groove segment; 1117 - third groove segment; 12 - second wall; 13 - side wall; 14 - housing body; 141 - bottom wall; 15 - end cap; 20 - electrode assembly; 30 - insulating member; 31 - first hollowed - out area; 32 - first insulating member; 33 - second insulating member; 331 - flanging portion; 34 - second hollowed - out area; 40 - electrode terminal; 100 - battery device; 110 - box body; 120 - bonding layer; 130 - connecting component; 140 - connecting layer; 150 - first sub - box body; 160 - second sub - box body; 1000 - vehicle; 1100 - controller; 1200 - motor; X - thickness direction of the first wall. Detailed implementation manners

[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0077] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above - mentioned drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0078] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0079] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "linked", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0080] The term "and / or" in the present application is merely an association relationship describing the associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0081] The "multiple" mentioned in the present application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0082] The battery device (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 (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0083] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0084] In some embodiments, the battery device can be a battery pack (battery Pack), and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0085] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0086] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0087] As an example, the housing may include a first housing and a second housing. The first housing and the second housing are snapped together so that a closed space is formed inside the housing to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first housing can be a top cover or a bottom plate.

[0088] As an example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the housing to accommodate the battery cell assembly.

[0089] As an example, the housing can be part of the chassis structure of a vehicle. For example, the top cover of the housing can become at least part of the floor of the vehicle, or the frame of the housing can become at least part of the cross beam and longitudinal beam of the vehicle.

[0090] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a housing with a door provided on at least one side of the housing. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0091] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0092] The battery cell can be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0093] As an example, the battery cell can be a pouch battery cell.

[0094] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) shuttle between the positive electrode and the negative electrode for insertion and extraction. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0095] In some embodiments, the positive electrode can be a positive electrode tab, and the positive electrode tab can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0096] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0097] As an example, the positive electrode current collector can be a metal foil 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, etc. can be used. 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 (such as 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.).

[0098] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used.

[0099] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector.

[0100] As an example, the negative electrode current collector can be a metal foil 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, etc. can be used.

[0101] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0102] As an example, the negative electrode active material can be a negative electrode active material for a battery well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0103] In some embodiments, the separator is a diaphragm. The present application does not particularly limit the type of the diaphragm, and any well-known porous structure diaphragm with good chemical stability and mechanical stability can be selected.

[0104] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0105] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0106] At present, from the perspective of market development, battery devices have been widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment, etc. As the application areas of batteries continue to expand, the market demand is also constantly expanding.

[0107] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or internal conditions of the battery change, the reliability of the battery device is also one of the key factors to consider.

[0108] Currently, a battery cell assembly is contained in a box by directly fixing a plurality of battery cells to the box. The fixing method is to directly bond the battery cells to the box, or to bond the battery cells to a connecting component (such as a pressure strip) and then connect the battery cells to the box via the connecting component.

[0109] However, when the battery device is subjected to external impact or after a period of time, there is a risk that the adhesive layer used to bond with the battery cell will fall off the battery cell, thereby affecting the reliability of the battery cell connection to the box. There is a risk that the connection between the battery cell and the box will fail, resulting in damage to the battery cell, affecting the reliability of the battery device.

[0110] Based on the above considerations, in order to solve the problem that the adhesive layer falls off from the battery cell, resulting in failure of the connection between the battery cell and the box, thereby affecting the poor reliability of the battery device, an embodiment of the present application provides a battery cell. The battery cell includes a shell and an insulating member. The shell has a first wall. The insulating member is coated on the outside of the shell and covers the outer surface of the first wall. Among them, the insulating member is provided with a first hollow area, the first hollow area is located on the side of the first wall away from the electrode assembly, and the outer surface of the first wall forms an exposed area at a position corresponding to the first hollow area, and the exposed area is provided with a groove and / or a protrusion.

[0111] By providing grooves and / or protrusions in the exposed area, the frictional force between the exposed area and the adhesive layer is increased, the risk of the adhesive layer peeling off from the exposed area is reduced, and the bonding reliability between the adhesive layer and the exposed area is improved, thereby improving the reliability of the battery cell connection box and the reliability of the battery device.

[0112] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0113] For the convenience of description, the following embodiments take a vehicle as an example of an electrical device in an embodiment of the present application for illustration.

[0114] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000 and used for the circuit system of the vehicle 1000, such as for the working power requirements during the start, navigation, and operation of the vehicle 1000.

[0115] The vehicle 1000 may further include a controller 1100 and a motor 1200. The controller 1100 is used to control the battery device 100 to supply power to the motor 1200. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0116] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0117] The battery device includes a battery cell assembly and a power management system. The battery management system is connected to the battery cell assembly for managing the charging and discharging of the battery cell assembly.

[0118] Please refer to Figure 2 , Figure 2An exploded view of the battery device provided by some embodiments of the present application. The battery device 100 may further include a box body 110, and the battery cell 1 is accommodated in the box body 110. Among them, the box body 110 is used to provide an accommodation space for the battery cell 1, and the box body 110 can adopt various structures. In some embodiments, the box body 110 may include a first sub-box body 150 and a second sub-box body 160. The first sub-box body 150 and the second sub-box body 160 cover each other, and the first sub-box body 150 and the second sub-box body 160 jointly define an accommodation space for accommodating the battery cell 1. The first sub-box body 150 may be a hollow structure with one end open, and the second sub-box body 160 may be a plate-like structure. The second sub-box body 160 covers the open side of the first sub-box body 150 so that the first sub-box body 150 and the second sub-box body 160 jointly define an accommodation space; the first sub-box body 150 and the second sub-box body 160 may also both be hollow structures with one side open, and the open side of the first sub-box body 150 covers the open side of the second sub-box body 160.

[0119] In the battery device 100, there may be multiple battery cells 1, and the multiple battery cells 1 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 may be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 1 is accommodated in the box body 110; of course, the battery device 100 may also be that multiple battery cells 1 are first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 110. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 1.

[0120] Among them, the battery cell 1 may be a secondary battery or a primary battery; the battery cell 1 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0121] Please refer to Figure 3 , Figure 3 An exploded view of the battery cell provided by some embodiments of the present application. The battery cell 1 includes one or more electrode assemblies 20 and a housing 10. The housing 10 may include a casing 14. Multiple wall portions of the casing 14, that is, multiple wall portions of the housing 10, enclose a cavity, and this cavity can be used to accommodate the electrode assembly 20. The casing 14 is determined according to the shape after the combination of one or more electrode assemblies 20. For example, the casing 14 may be a hollow cuboid, cube, or regular polyhedron, and one of the faces of the casing 14 has an opening so that one or more electrode assemblies 20 can be placed inside the casing 14. The casing 14 is filled with an electrolyte, such as an electrolyte solution.

[0122] The battery cell 1 may further include two electrode terminals 40, and the two electrode terminals 40 may be disposed on the end cap 15. The end cap 15 is generally in a flat plate shape, and the two electrode terminals 40 are fixed on the flat plate surface of the end cap 15. The two electrode terminals 40 are a positive electrode terminal and a negative electrode terminal respectively. In the battery cell 1, according to actual usage requirements, the electrode assembly 20 may be provided as a single one or multiple ones, and a plurality of independent electrode assemblies 20 are provided in the battery cell 1.

[0123] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of a battery cell provided in some embodiments of the present application. Some embodiments of the present application provide a battery cell 1. The battery cell 1 includes a housing 10, an electrode assembly 20, and an insulating member 30. The housing 10 has a first wall 11. The electrode assembly 20 is accommodated in the housing 10. The insulating member 30 is coated on the outer side of the housing 10 and covers the outer surface of the first wall 11. Wherein, the insulating member 30 is provided with a first hollowed-out area 31, and the first hollowed-out area 31 is located on the side of the first wall 11 facing away from the electrode assembly 20. An exposed area 111 is formed on the outer surface of the first wall 11 at a position corresponding to the first hollowed-out area 31, and the exposed area 111 is provided with a groove 1111 and / or a protrusion 1112.

[0124] In some embodiments, the shape of the housing 10 may include but is not limited to a cylinder, a cuboid, a blade shape, etc. The material of the housing 10 may include but is not limited to copper, iron, aluminum, steel, or aluminum alloy, etc.

[0125] In some embodiments, the housing 10 has a first wall 11, and the first wall 11 may be one or at least one of an end cap 15, a side wall 13, or a bottom wall 141.

[0126] In some embodiments, the first wall 11 may be the end cap 15.

[0127] In some embodiments, the electrode assembly 20 is accommodated in the housing 10, and the outer surface of the first wall 11 is the surface of the first wall 11 facing away from the electrode assembly 20.

[0128] In some embodiments, the material of the insulating member 30 may include but is not limited to rubber, silica gel, or rubber, etc. The insulating member 30 may cover the outer surface of the first wall 11 by means of bonding, clamping, welding, etc.

[0129] In some embodiments, the outer surface of the housing 10 is coated with an insulating member 30, so that the insulating member 30 can insulate and isolate the housing 10 of the battery cell 1 from the external environment to reduce the risk of short circuit during the use of the battery cell 1.

[0130] In some embodiments, the first wall 11 forms an exposed area 111 at a position corresponding to the first hollowed-out area 31. That is, the insulating member 30 is provided with the first hollowed-out area 31, so that there is an area on the first wall 11 of the housing 10 that is avoided by the first hollowed-out area 31, thereby forming an exposed area 111 on the first wall 11 that is not covered by the insulating member 30.

[0131] In some embodiments, the number of the first hollowed-out areas 31 provided on the insulating member 30 can be one or more.

[0132] In some embodiments, the insulating member 30 can be provided with two first hollowed-out areas 31, and the two first hollowed-out areas 31 are spaced apart to form two corresponding exposed areas 111 on the first wall 11, so as to increase the connection strength between the first wall 11 and the connecting member 130.

[0133] In some embodiments, the first hollowed-out area 31 can be rectangular, and correspondingly, the exposed area 111 formed on the first wall 11 is also rectangular.

[0134] In some embodiments, the first hollowed-out area 31 can also be triangular, pentagonal, circular, oval, etc.

[0135] In some embodiments, the exposed area 111 is used to connect with the connecting member 130, and the connection method between the exposed area 111 and the connecting member 130 can be bonding.

[0136] Please refer to Figure 5 , Figure 5 which is a cross-sectional view of the first wall provided in some embodiments of the present application. In some embodiments, the exposed area 111 can be provided with a groove 1111. The processing method of the groove 1111 can be machining.

[0137] Please refer to Figure 6 , Figure 6 which is a cross-sectional view of the first wall provided in some other embodiments of the present application. In some embodiments, the exposed area 111 can be provided with a protrusion 1112. The processing method of the protrusion 1112 can be extrusion.

[0138] Please refer to Figure 7 , Figure 7 which is a cross-sectional view of the first wall provided in some other embodiments of the present application. In some embodiments, the exposed area 111 can be provided with both a groove 1111 and a protrusion 1112.

[0139] In some embodiments, when the adhesive layer 120 is provided on the exposed area 111, the adhesive layer 120 will bond with the wall surface of the groove 1111, thereby increasing the contact area between the adhesive layer 120 and the exposed area 111.

[0140] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 111, the adhesive layer 120 will adhere to the wall surface of the protrusion 1112, thereby increasing the contact area between the adhesive layer 120 and the exposed area 111.

[0141] In the technical solution of the embodiment of the present application, the battery cell 1 is connected to the box body 110 through the adhesive layer 120 to form the battery device 100. By providing the groove 1111 and / or the protrusion 1112 in the exposed area 111, the friction between the exposed area 111 and the adhesive layer 120 is increased, the risk of the adhesive layer 120 falling off from the exposed area 111 is reduced, the adhesion reliability between the adhesive layer 120 and the exposed area 111 is improved, thereby improving the reliability of the connection between the battery cell 1 and the box body 110, and improving the reliability of the battery device 100.

[0142] Please refer to Figure 8 and Figure 9 , Figure 8 which is a schematic diagram of the exposed area provided by some embodiments of the present application, Figure 9 and which is a schematic diagram of the exposed area provided by other embodiments of the present application. In some embodiments, the groove 1111 includes a first groove 1113, and the exposed area 111 includes a plurality of first grooves 1113, and the plurality of first grooves 1113 form an adhesive area 11131.

[0143] In some embodiments, the number of the first grooves 1113 may be multiple, and the openings of the plurality of first grooves 1113 may be circular, square or other shapes.

[0144] In some embodiments, the shapes of the openings of the plurality of first grooves 1113 may all be the same, may all be different, or may be partially the same.

[0145] In some embodiments, the first grooves 1113 may be arranged in different ways to form an embossed pattern, and the embossed pattern is the adhesive area 11131. The embossed pattern may be the shape of a specific object, such as a flower, an animal, etc., or may be an irregular shape. It should be noted that on the exposed area 111, the adhesive layer 120 is also provided in the area other than the adhesive area 11131.

[0146] In some embodiments, in the thickness direction X of the first wall, the inner diameter of the first groove 1113 may remain unchanged.

[0147] In some embodiments, in the thickness direction X of the first wall, the inner diameter of the first groove 1113 may change, and the form of the change may be a linear change or an irregular change.

[0148] The technical solution of the embodiment of the present application provides multiple first grooves 1113 for connecting with the adhesive layer 120, further improving the bonding reliability between the adhesive layer 120 and the exposed area 111, thereby enhancing the reliability of connecting the battery cell 1 to the box body 110 and improving the reliability of the battery device 100.

[0149] Please refer to Figure 8 , in some embodiments, the opening of the first groove 1113 is circular, and the diameter R1 of the opening is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0150] In some embodiments, the diameter R1 of the opening of the first groove 1113 may satisfy the condition: 0.4 mm ≤ R1 ≤ 1.2 mm. For example, R1 may be a specific value among 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm or a value between any two of them.

[0151] In some embodiments, the opening diameters R1 of the multiple first grooves 1113 may all be the same, partially the same, or all different.

[0152] With the technical solution of the embodiment of the present application, when the opening diameter of the first groove 1113 meets the above conditions, it is easy to process and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0153] Please refer to Figure 8 , in some embodiments, the diameter R1 of the opening is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0154] In some embodiments, the diameter R1 of the opening of the first groove 1113 may satisfy the condition: 0.4 mm ≤ R1 ≤ 0.8 mm. For example, R1 may be a specific value among 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or a value between any two of them.

[0155] With the technical solution of the embodiment of the present application, when the opening diameter of the first groove 1113 meets the above conditions, it is easy to process and further improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0156] Please refer to Figure 8 , in some embodiments, the opening of the first groove 1113 is square, and the side length A1 of the opening is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0157] In some embodiments, the side length A1 of the opening of the first groove 1113 may satisfy the condition: 0.4 mm ≤ A1 ≤ 1.2 mm. For example, A1 may be a specific value among 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm or a value between any two of them.

[0158] In some embodiments, the side lengths A1 of the openings of the plurality of first grooves 1113 may all be the same, some may be the same, or none may be the same.

[0159] In the technical solution of the embodiment of the present application, the side length of the opening of the first groove 1113 satisfies the above conditions, which is easy to process and improves the bonding reliability between the bonding layer 120 and the exposed area 111.

[0160] Please refer to Figure 8 , in some embodiments, the side length A1 of the opening is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0161] In some embodiments, the side length A1 of the opening of the first groove 1113 may satisfy the condition: 0.4 mm ≤ A1 ≤ 0.8 mm. For example, A1 may be a specific value among 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or a value between any two of them.

[0162] In the technical solution of the embodiment of the present application, the side length of the opening of the first groove 1113 satisfies the above conditions, which is easy to process and further improves the bonding reliability between the bonding layer 120 and the exposed area 111.

[0163] Please refer to Figure 5 , in some embodiments, in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

[0164] In some embodiments, the thickness direction of the first wall may be represented by the direction indicated by the letter X in the figure.

[0165] In some embodiments, the end cap 15 and the bottom wall 141 may be oppositely arranged along the thickness direction X of the first wall.

[0166] In some embodiments, the depth D1 of the first groove 1113 may satisfy the condition: 0.08 mm ≤ D1 ≤ 0.5 mm. For example, D1 may be a specific value among 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or a value between any two of them.

[0167] In some embodiments, the depths D1 of the plurality of first grooves 1113 may all be the same, some may be the same, or none may be the same.

[0168] It should be noted that in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is less than the thickness of the first wall 11.

[0169] In the technical solution of the embodiment of the present application, the depth of the first groove 1113 satisfies the above conditions, reducing the impact on the structural strength of the first wall 11, and at the same time improving the bonding reliability between the bonding layer 120 and the exposed area 111.

[0170] Please refer to Figure 5 , in some embodiments, in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

[0171] In some embodiments, the depth D1 of the first groove 1113 may satisfy the condition: 0.08 mm ≤ D1 ≤ 0.2 mm. For example, D1 may be a specific value among 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm or a value between two of them.

[0172] In the technical solution of the embodiment of the present application, the depth of the first groove 1113 satisfies the above conditions, further reducing the impact on the structural strength of the first wall 11, and at the same time improving the bonding reliability between the bonding layer 120 and the exposed area 111.

[0173] Please refer to Figure 10 , Figure 10 is a schematic diagram of the second groove provided in some embodiments of the present application. In some embodiments, the groove 1111 includes a second groove 1114, and the second groove 1114 includes a first groove segment 1115 and a second groove segment 1116. The first groove segment 1115 and the second groove segment 1116 are arranged along the thickness direction X of the first wall, and the first groove segment 1115 is closer to the outer surface of the first wall 11 than the second groove segment 1116. Among them, the diameter of the first groove segment 1115 is smaller than the diameter of the second groove segment 1116.

[0174] In some embodiments, the second groove 1114 may be formed by injection molding.

[0175] In some embodiments, in the thickness direction X of the first wall, the first groove segment 1115 and the second groove segment 1116 are arranged in sequence, and the first groove segment 1115 is connected to the end of the second groove segment 1116 facing away from the electrode assembly 20.

[0176] In some embodiments, the second groove 1114 may only include a first groove segment 1115 and a second groove segment 1116, and one end of the first groove segment 1115 facing away from the second groove segment 1116 extends to the outer surface of the first wall 11.

[0177] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 111, the adhesive layer 120 enters the first groove segment 1115 and the second groove segment 1116. Since the diameter of the first groove segment 1115 is smaller than the diameter of the second groove segment 1116, the adhesive layer 120 will contact or abut against the inner wall of the second groove segment 1116 facing away from the electrode assembly 20, so that the adhesive layer 120 is not easily detached from the second groove segment 1116.

[0178] In some embodiments, in the thickness direction X of the first wall, the diameter of the first groove segment 1115 may remain unchanged.

[0179] In some embodiments, in the thickness direction X of the first wall, the diameter of the first groove segment 1115 may change.

[0180] In some embodiments, in the thickness direction X of the first wall, the diameter of the second groove segment 1116 may remain unchanged.

[0181] In some embodiments, in the thickness direction X of the first wall, the diameter of the first groove segment 1115 may be deformed.

[0182] It should be noted that the diameter of the connection part of the first groove segment 1115 and the second groove segment 1116 is smaller than the diameter of the connection part of the second groove segment 1116 and the first groove segment 1115.

[0183] In the technical solution of the embodiment of the present application, the adhesive layer 120 enters the second groove segment 1116 from the first groove segment 1115. The diameter of the first groove segment 1115 of the second groove 1114 is smaller than the diameter of the second groove segment 1116, reducing the risk of the adhesive layer 120 falling off from the second groove segment 1116 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0184] Please refer to Figure 11 , Figure 11 For the schematic diagram of the second groove provided in some other embodiments of the present application. In some embodiments, the second groove 1114 includes a third groove segment 1117. The third groove segment 1117, the first groove segment 1115 and the second groove segment 1116 are arranged in sequence along the thickness direction X of the first wall. One end of the third groove segment 1117 extends to the outer surface of the first wall 11, and the other end is communicated with the first groove segment 1115. Among them, the diameter of the first groove segment 1115 is smaller than the diameter of the third groove segment 1117.

[0185] In some embodiments, the second groove 1114 may further include a third groove segment 1117. In the thickness direction X of the first wall, the third groove segment 1117, the first groove segment 1115, and the second groove segment 1116 are arranged in sequence. The first groove segment 1115 is connected to one end of the second groove segment 1116 facing away from the electrode assembly 20, and the third groove segment 1117 is connected to one end of the first groove segment 1115 facing away from the electrode assembly 20. One end of the third groove segment 1117 facing away from the first groove segment 1115 extends to the outer surface of the first wall 11.

[0186] In some embodiments, the number of the second grooves 1114 may be multiple. Among them, some of the second grooves 1114 may include the first groove segment 1115, the second groove segment 1116, and the third groove segment 1117, and some of the other second grooves 1114 may only include the first groove segment 1115 and the second groove segment 1116.

[0187] In some embodiments, the number of the second grooves 1114 may be multiple, and all of the second grooves 1114 may include the first groove segment 1115, the second groove segment 1116, and the third groove segment 1117.

[0188] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 111, the adhesive layer 120 enters the third groove segment 1117, the first groove segment 1115, and the second groove segment 1116. Since the diameter of the third groove segment 1117 is larger than that of the first groove segment 1115, the contact area between the adhesive layer 120 and the connecting component 130 is relatively large.

[0189] In some embodiments, in the thickness direction X of the first wall, the diameter of the third groove segment 1117 may remain unchanged.

[0190] In some embodiments, in the thickness direction X of the first wall, the diameter of the third groove segment 1117 may change.

[0191] In some embodiments, in the thickness direction X of the first wall, the diameter of the third groove segment 1117 may remain unchanged.

[0192] In some embodiments, in the thickness direction X of the first wall, the diameter of the third groove segment 1117 may change.

[0193] It should be noted that the diameter of one end of the third groove segment 1117 facing away from the electrode assembly 20 may be larger than the diameter of one end of the first groove segment 1115 facing away from the electrode assembly 20.

[0194] In the technical solution of the embodiment of the present application, the adhesive layer 120 sequentially passes through the third groove section 1117 and the first groove section 1115 and enters the second groove section 1116. The diameter of the first groove section 1115 of the second groove 1114 is smaller than the diameter of the second groove section 1116, and the diameter of the first groove section 1115 of the second groove 1114 is smaller than the diameter of the third groove section 1117, reducing the risk of the adhesive layer 120 falling off from the second groove section 1116. The adhesive layer 120 passing through the third groove section 1117 is used for bonding, increasing the bonding area and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0195] Please refer to Figure 10 , in some embodiments, the diameter R2 of the first groove section 1115 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0196] In some embodiments, the diameter R2 of the first groove section 1115 may satisfy the condition: 1 mm ≤ R2 ≤ 3 mm. For example, R2 may be a specific value among 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or a value between any two of them.

[0197] In some embodiments, the number of the second grooves 1114 may be multiple. The diameters R2 of the multiple first groove sections 1115 may all be the same, or partially the same, or all different.

[0198] In the technical solution of the embodiment of the present application, when the diameter of the first groove section 1115 meets the above conditions, it is easy to process, while reducing the risk of the adhesive layer 120 falling off from the second groove section 1116 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0199] Please refer to Figure 10 , in some embodiments, the diameter R3 of the second groove section 1116 is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0200] In some embodiments, the diameter R3 of the second groove section 1116 may satisfy the condition: 1.5 mm ≤ R3 ≤ 4 mm. For example, R3 may be a specific value among 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or a value between any two of them.

[0201] In some embodiments, the number of the second grooves 1114 may be multiple. The diameters R3 of the multiple second groove sections 1116 may all be the same, or partially the same, or all different.

[0202] In the technical solution of the embodiment of the present application, the diameter of the second groove section 1116 meets the above conditions. While being easy to process, it reduces the risk of the adhesive layer 120 falling off from the second groove section 1116 and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0203] Please refer to Figure 11 , in some embodiments, the diameter R4 of the third groove section 1117 is greater than or equal to 2 mm and less than or equal to 4 mm.

[0204] In some embodiments, the diameter R4 of the third groove section 1117 may meet the condition: 2 mm ≤ R4 ≤ 4 mm. For example, R4 may be a specific value among 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or a value between any two of them.

[0205] In some embodiments, the number of the second grooves 1114 may be multiple. The diameters R4 of the multiple third groove sections 1117 may all be the same, may be partially the same, or may all be different.

[0206] In the technical solution of the embodiment of the present application, the diameter of the third groove section 1117 meets the above conditions. While increasing the bonding area, it reduces the risk of the adhesive layer 120 falling off from the exposed area 111 and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0207] Please refer to Figure 11 , in some embodiments, in the thickness direction X of the first wall, the depth D2 of the second groove 1114 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0208] In some embodiments, the depth D2 of the second groove 1114 may meet the condition: 0.4 mm ≤ D2 ≤ 1.5 mm. For example, D2 may be a specific value among 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm or a value between any two of them.

[0209] In some embodiments, the depths D2 of the multiple second grooves 1114 may all be the same, may be partially the same, or may all be different.

[0210] It should be noted that in the thickness direction X of the first wall, the depth D2 of the second groove 1114 is less than the thickness of the first wall 11.

[0211] In some embodiments, the number of the second grooves 1114 may be multiple. The depths D2 of the multiple second grooves 1114 may all be the same, may be partially the same, or may all be different.

[0212] In the technical solution of the embodiment of the present application, the depth of the second groove 1114 satisfies the above conditions, reducing the risk of the exposed area 111 of the adhesive layer 120 falling off, and at the same time reducing the risk of affecting the structural strength of the first wall 11, and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0213] Please refer to Figure 10 , in some embodiments, in the thickness direction X of the first wall, the depth D3 of the first groove segment 1115 is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

[0214] In some embodiments, the depth D3 of the first groove segment 1115 may satisfy the condition: 0.2 mm ≤ D3 ≤ 0.75 mm. For example, D3 may be a specific value among 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm or a value between any two of them.

[0215] In some embodiments, the number of the second grooves 1114 may be multiple. The depths D3 of the first groove segments 1115 of the multiple second grooves 1114 may all be the same, or partially the same, or all different.

[0216] In the technical solution of the embodiment of the present application, the depth of the first groove segment 1115 satisfies the above conditions. While being easy to process, it reduces the risk of the adhesive layer 120 falling off from the second groove segment 1116, and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0217] Please refer to Figure 10 , in some embodiments, in the thickness direction X of the first wall, the depth D4 of the second groove segment 1116 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0218] In some embodiments, the depth D4 of the second groove segment 1116 may satisfy the condition: 0.1 mm ≤ D4 ≤ 0.4 mm. For example, D4 may be a specific value among 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm or a value between any two of them.

[0219] In some embodiments, the number of the second grooves 1114 may be multiple. The depths D4 of the second groove segments 1116 of the multiple second grooves 1114 may all be the same, or partially the same, or all different.

[0220] In the technical solution of the embodiment of the present application, the depth of the second groove segment 1116 satisfies the above conditions. While being easy to process, it reduces the risk of the adhesive layer 120 falling off from the second groove segment 1116, and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0221] Please refer to Figure 11 In some embodiments, in the thickness direction X of the first wall, the depth D5 of the third groove segment 1117 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0222] In some embodiments, the depth D5 of the third groove segment 1117 may satisfy the condition: 0.1 mm ≤ D3 ≤ 0.4 mm. For example, D5 may be a specific value among 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm or a value between any two of them.

[0223] In some embodiments, the number of the second grooves 1114 may be multiple. The depths D5 of the third groove segments 1117 of the multiple second grooves 1114 may all be the same, partially the same, or all different.

[0224] In the technical solution of the embodiment of the present application, when the depth of the third groove segment 1117 satisfies the above conditions, it is easy to process, while reducing the risk of the adhesive layer 120 peeling off from the exposed area 111, and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0225] Please refer to Figure 3 and Figure 4 and refer to Figure 12 , Figure 12 FIG. is a schematic structural diagram of a battery cell provided in some other embodiments of the present application. In some embodiments, the housing 10 further includes a second wall 12 and a side wall 13. Along the thickness direction X of the first wall, the second wall 12 is disposed opposite to the first wall 11, and the side wall 13 surrounds the first wall 11 and the second wall 12. The insulating member 30 includes a separately disposed first insulating member 32 and a second insulating member 33. The first insulating member 32 covers a part of the outer surface of the first wall 11, and the second insulating member 33 covers at least a part of the outer surface of the second wall 12 and at least a part of the outer surface of the side wall 13.

[0226] In some embodiments, along the thickness direction X of the first wall, the second wall 12 is disposed opposite to the first wall 11, and the side wall 13 surrounds the first wall 11 and the second wall 12, that is, the first wall 11 and the second wall 12 are spaced apart along the thickness direction X of the first wall and are respectively disposed at both ends of the side wall 13. The side wall 13 surrounds the first wall 11 along the circumferential direction of the first wall 11 and surrounds the second wall 12 along the circumferential direction of the second wall 12.

[0227] It should be noted that the structure of the outer shell 10 can be various. The first wall 11, the second wall 12, and the side wall 13 can all be split structures, or the second wall 12 and the side wall 13 can be integrally formed structures, with the first wall 11 connected to one end of the side wall 13 away from the first wall 11. It can also be that the first wall 11 and the side wall 13 are integrally formed structures, and the second wall 12 is connected to one end of the side wall 13 away from the second wall 12.

[0228] In some embodiments, the first insulating member 32 covers the outer surface of the first wall 11 facing away from the electrode assembly 20, that is, the first insulating member 32 is disposed on the first wall 11 and is located on the side of the first wall 11 facing away from the interior of the battery cell 1.

[0229] In some embodiments, the second insulating member 33 covers the outer surface of the second wall 12 facing away from the electrode assembly 20 and the outer surface of the side wall 13 facing away from the electrode assembly 20, that is, the second insulating member 33 is disposed on the housing 14 formed by enclosing the second wall 12 and the side wall 13, and is located on the side of the housing 14 facing away from the interior of the battery cell 1.

[0230] In some embodiments, the first insulating member 32 can cover the entire surface of the first wall 11, and the first hollowed-out area 31 can be provided on the first insulating member 32.

[0231] In some embodiments, the first insulating member 32 can cover a part of the surface of the first wall 11, and the first hollowed-out area 31 can be provided on the first insulating member 32.

[0232] In some embodiments, the first insulating member 32 can cover a part of the surface of the first wall 11, and the second insulating member 33 can also cover a part of the surface of the first wall 11. The first insulating member 32 and the second insulating member 33 do not contact each other, and the edges of the second insulating member 33 and the edges of the first insulating member 32 jointly define the first hollowed-out area 31.

[0233] In some embodiments, the first insulating member 32 can cover a part of the surface of the first wall 11, and the second insulating member 33 can also cover a part of the surface of the first wall 11. The first insulating member 32 and the second insulating member 33 do not contact each other, and the first hollowed-out area 31 can be provided on the first insulating member 32.

[0234] In the technical solution of the embodiment of the present application, by setting the insulator as the split first insulating member 32 and the second insulating member 33, the first insulating member 32 is a structure covering the first wall 11, and the second insulating member 33 is a structure covering the side wall 13 and the second wall 12, so that the first insulating member 32 and the second insulating member 33 of the insulating member 30 are respectively arranged corresponding to the first wall 11 of the outer shell 10 and the second wall 12 and the side wall 13 of the outer shell 10, thereby facilitating the reduction of the assembly difficulty between the insulating member 30 and the outer shell 10.

[0235] Please refer toFigure 3 , Figure 4 and Figure 12 In some embodiments, the second insulating member 33 has a flange portion 331 , which is arranged along the circumference of the first wall 11 and located on the outer surface of the first wall 11 , and the flange portion 331 and the edge of the first insulating member 32 together enclose the first hollow area 31 .

[0236] In some embodiments, the second insulating member 33 has a flange portion 331, which is arranged along the circumference of the first wall 11 and is located on the side of the first wall 11 that is away from the electrode assembly 20, that is, a portion of the second insulating member 33 arranged on the outer side of the shell 14 formed by the second wall 12 and the side wall 13 is folded onto the first wall 11, so that the second insulating member 33 is formed with a flange portion 331 located on the outer surface of the first wall 11, and the flange portion 331 is an annular structure extending along the circumference of the first wall 11.

[0237] In some embodiments, the flange portion 331 and the edge of the first insulating member 32 together enclose a first hollow area 31, that is, the first hollow area 31 is enclosed by the flange portion 331 of the annular structure and the edge of the first insulating member 32 arranged on the outer surface of the first wall 11, that is, the inner edge of the flange portion 331 and the outer edge of the first insulating member 32 together define the first hollow area 31.

[0238] According to the technical solution of the embodiment of the present application, the second insulating member 33 has a flange portion 331 arranged on the first wall 11 along the circumference of the first wall 11 and located at the edge of the first wall 11, so that the edge of the first insulating member 32 arranged on the first wall 11 and part of the flange portion 331 are jointly enclosed to form a first hollow area 31 to form an exposed area 111 on the first wall 11. The battery cell 1 adopting this structure does not need to set the first insulating member 32 as a structure with a through hole, which is beneficial to improving the overall structural strength of the first insulating member 32. On the other hand, it is beneficial to control the size and dimensions of the first hollow area 31.

[0239] Please refer to Figure 3 , Figure 4 and Figure 12 In some embodiments, the battery cell 1 further includes an electrode terminal 40 , which is disposed on the first wall 11 . The insulating member 30 is provided with a second hollow area 34 , which is spaced apart from the first hollow area 31 , and the electrode terminal 40 is disposed through the second hollow area 34 .

[0240] In some embodiments, the second hollow area 34 is spaced apart from the first hollow area 31 , that is, the electrode terminal 40 disposed on the first wall 11 is spaced apart from the first hollow area 31 , and part of the insulating member 30 is located between the electrode terminal 40 and the first hollow area 31 .

[0241] In the technical solution of the embodiment of the present application, the electrode terminal 40 is disposed on the first wall 11, and the insulating member 30 is provided with a second hollow area 34 through which the power supply terminal 40 passes at a position corresponding to the electrode terminal 40. By disposing the second hollow area 34 at an interval from the first hollow area 31, on the one hand, the exposed area 111 formed on the first wall 11 corresponding to the first hollow area 31 can be disposed at an interval from the electrode terminal 40, so as to reduce the interference effect between the exposed area 111 and the electrode terminal 40 when the exposed area 111 is connected to an external component.

[0242] Please refer to Figure 3 , in some embodiments, the housing 10 includes a housing body 14 and an end cover 15. The housing body 14 includes a bottom wall 141 and a plurality of side walls 13. The bottom wall 141 and the end cover 15 are disposed opposite to each other along the thickness direction X of the first wall. The plurality of side walls 13 surround the bottom wall 141. One end of the plurality of side walls 13 is connected to the bottom wall 141, and the other end forms an opening. The end cover 15 closes the opening, and the end cover 15 is the first wall 11.

[0243] In some embodiments, the second wall 12 and the side wall 13 enclose a hollow structure with an opening at one end in the thickness direction X of the first wall, and the first wall 11 covers the opening to form the housing 10 for accommodating the electrode assembly 20.

[0244] In some embodiments, the second wall 12 and the side wall 13 may also be a split structure, that is, the side wall 13 is a hollow structure with openings at both ends in the thickness direction X of the first wall, and the first wall 11 and the second wall 12 respectively cover the two openings of the side wall 13.

[0245] In some embodiments, the second wall 12 and the side wall 13 are an integrally formed structure, that is, the second wall 12 and the side wall 13 of the housing 10 are made by an integral forming process, such as stamping or casting.

[0246] In the technical solution of the embodiment of the present application, the end cover 15 is the first wall 11, which increases the friction between the end cover 15 and the adhesive layer 120, reduces the risk of the adhesive layer 120 falling off from the end cover 15, improves the bonding reliability between the adhesive layer 120 and the end cover 15, thereby improving the reliability of the connection between the end cover 15 and the box body 110, and improving the reliability of the battery device 100.

[0247] Please refer to Figures 13 to 15 , Figure 13 is a schematic diagram of the internal structure of a battery device provided by some embodiments of the present application, Figure 14 is a schematic diagram of the connection between the exposed area and the connection component provided by some embodiments of the present application, Figure 15 is a schematic diagram of the connection between the exposed area and the connection component provided by some other embodiments of the present application. Among them, for the convenience of showing the internal structure of the battery device, Figure 13The first sub - box body is hidden therein. An embodiment of the present application also provides a battery device 100. The battery device 100 includes a box body 110, an adhesive layer 120, a connecting component 130, and the battery cell 1 of any of the above - mentioned embodiments. The battery cell 1 is disposed inside the box body 110. The adhesive layer 120 is disposed in the exposed area 111. The connecting component 130 is disposed inside the box body 110. In the thickness direction X of the first wall, at least one side of the connecting component 130 is connected to the adhesive layer 120 to connect a plurality of battery cells 1.

[0248] In some embodiments, the battery cell 1 is placed inside the box body 110, that is, the second wall 12 of the battery cell 1 is configured to support the electrode assembly 20, so that the second wall 12 can support the electrode assembly 20 in the thickness direction X of the first wall. That is to say, the first wall 11 of the outer shell 10 is arranged facing the top of the box body 110, the second wall 12 of the outer shell 10 is arranged facing the bottom of the box body 110, or in the actual use process, the second wall 12 of the outer shell 10 is arranged facing the ground or downward, so that the thickness direction X of the first wall is the up - and - down direction.

[0249] Wherein, the connecting component 130 is disposed between the first wall 11 and the top of the box body 110 in the thickness direction X of the first wall, and the connecting component 130 is bonded to the exposed area 111 formed with the first wall 11.

[0250] In some embodiments, the connecting component 130 can be a pressing strip.

[0251] In some embodiments, the connecting component 130 is made of an insulating material. The material of the connecting component 130 can be rubber, plastic, silicone, etc. The connecting component 130 with this structure can achieve an insulating connection between the connecting component 130 and the battery cell 1 to reduce risks such as electric leakage or short - circuit.

[0252] It should be noted that in other embodiments, the battery cell 1 can also be placed upside - down inside the box body 110, that is, the first wall 11 of the battery cell 1 is configured to support the electrode assembly 20, so that the first wall 11 can support the electrode assembly 20 in the thickness direction X of the first wall, so that the connecting component 130 is disposed between the first wall 11 and the bottom of the box body 110 in the thickness direction X of the first wall, and the connecting component 130 is bonded to the exposed area 111 formed with the first wall 11.

[0253] In some embodiments, the adhesive layer 120 can be a glue layer.

[0254] In some embodiments, in the thickness direction X of the first wall, one surface of the adhesive layer 120 is bonded to the exposed area 111, and the other surface is bonded to the connecting component 130, so that the side of the connecting component 130 facing the battery cell 1 connects a plurality of battery cells 1.

[0255] In the technical solution of the embodiment of the present application, the adhesive layer 120 is disposed in the exposed area 111 to connect the battery cell 1 and the connecting member 130, thereby improving the reliability of the connection between the battery cell 1 and the box body 110 and enhancing the reliability of the battery device 100.

[0256] Please refer to Figure 14 , in some embodiments, the exposed area 111 is provided with a groove 1111, and at least a part of the adhesive layer 120 is located in the groove 1111.

[0257] In some embodiments, the groove 1111 in the exposed area 111 may be completely filled with the adhesive layer 120.

[0258] In some embodiments, a part of the space in the groove 1111 of the exposed area 111 may be filled with the adhesive layer 120.

[0259] In the technical solution of the embodiment of the present application, the adhesive layer 120 is disposed in the groove 1111, reducing the risk of the adhesive layer 120 peeling off from the exposed area 111, improving the reliability of the connection between the battery cell 1 and the box body 110, and enhancing the reliability of the battery device 100.

[0260] Please refer to Figure 15 , in some embodiments, the exposed area 111 is provided with a protrusion 1112, and the protrusion 1112 is completely embedded in the adhesive layer 120.

[0261] In some embodiments, the entire outer surface of the protrusion 1112 in the exposed area 111 is in contact with the adhesive layer 120.

[0262] In the technical solution of the embodiment of the present application, the protrusion 1112 is embedded in the adhesive layer 120, reducing the risk of the adhesive layer 120 peeling off from the exposed area 111, improving the reliability of the connection between the battery cell 1 and the box body 110, and enhancing the reliability of the battery device 100.

[0263] Please refer to Figure 16 , Figure 16 is a schematic diagram showing the connection between the exposed area and the connecting member provided in still other embodiments of the present application. In some embodiments, the battery device 100 further includes a connecting layer 140, and in the thickness direction X of the first wall, the connecting layer 140 connects the exposed area 111 and the adhesive layer 120, and the material of the connecting layer 140 is a coupling agent.

[0264] In some embodiments, the material of the housing 10 may be metal.

[0265] In some embodiments, the material of the housing 10 may be aluminum metal.

[0266] In some embodiments, the material of the adhesive layer 120 may be synthetic resin.

[0267] In some embodiments, the coupling agent has the properties of being affinity with glue and metal. The molecule of the coupling agent has reactive groups that can chemically bond with inorganic materials (such as glass, silica sand, metal, etc.) and reactive groups that can chemically bond with organic materials (such as synthetic resins, etc.).

[0268] In some embodiments, in the thickness direction X of the first wall, one surface of the connection layer 140 can be connected to the exposed area 111, and the other surface can be connected to the adhesive layer 120.

[0269] In some embodiments, there may be no obvious delamination between the connection layer 140 and the adhesive layer 120, that is, both the connection layer 140 and the adhesive layer 120 can be in contact with the exposed area 111, and both can also be in contact with the connection component 130.

[0270] In the technical solution of the embodiment of the present application, the coupling agent has the properties of being affinity with the adhesive layer 120 and metal. The outer shell 10 of the battery cell 1 is metal, and the connection layer 140 is a coupling agent. By connecting the adhesive layer 120 and the exposed area 111 through the connection layer 140, the risk of the adhesive layer 120 falling off from the exposed area 111 is reduced, the reliability of connecting the battery cell 1 to the box body 110 is improved, and the reliability of the battery device 100 is improved.

[0271] The embodiment of the present application also provides an electrical device, including the battery in any of the above embodiments or the battery device 100 in any of the above embodiments. The battery cell 1 or the battery device 100 is used to provide electrical energy for the electrical device.

[0272] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 9 and Figure 11 , in some embodiments, the battery cell 1 includes an electrode assembly 20, an outer shell 10, and an insulating member 30. The electrode assembly 20 is disposed inside the outer shell 10. The outer shell 10 includes a housing 14 and an end cap 15. The housing 14 has an opening, and the end cap 15 covers the opening of the housing 14. The insulating member 30 is coated on the outside of the outer shell 10 and covers the outer surface of the end cap 15. Among them, the insulating member 30 is provided with a first hollowed-out area 31. The first hollowed-out area 31 is located on the side of the end cap 15 facing away from the electrode assembly 20. An exposed area 111 is formed on the outer surface of the end cap 15 at a position corresponding to the first hollowed-out area 31, and a groove 1111 is provided in the exposed area 111.

[0273] In some embodiments, the groove 1111 includes a first groove 1113 and a second groove 1114. The number of the first grooves 1113 is multiple, and the first grooves 1113 can be arranged in different ways to form an embossed pattern, and the embossed pattern is an adhesive area 11131.

[0274] The number of the second grooves 1114 is multiple. The second groove 1114 includes a first groove section 1115, a second groove section 1116, and a third groove section 1117. The third groove section 1117, the first groove section 1115, and the second groove section 1116 are sequentially connected along the thickness direction X of the first wall. One end of the third groove section 1117 extends to the outer surface of the end cap 15. Wherein, the diameter of the first groove section 1115 is smaller than the diameter of the third groove section 1117, and the diameter of the first groove section 1115 is smaller than the diameter of the second groove section 1116.

[0275] By providing the first groove 1113 and the second groove 1114 in the exposed area 111, the friction between the exposed area 111 and the adhesive layer 120 is increased, the risk of the adhesive layer 120 falling off from the exposed area 111 is reduced, the bonding reliability between the adhesive layer 120 and the exposed area 111 is improved, thereby improving the reliability of the connection between the battery cell 1 and the box body 110, and improving the reliability of the battery device 100.

[0276] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: a housing having a first wall; an electrode assembly, contained in the housing; An insulating member, wrapped around the outer side of the housing and covering the outer surface of the first wall; The insulating member is provided with a first hollow area, the first hollow area is located on the side of the first wall away from the electrode assembly, the outer surface of the first wall forms an exposed area at a position corresponding to the first hollow area, and the exposed area is provided with grooves and / or protrusions.

2. The battery cell according to claim 1, characterized in that, The groove includes a first groove, the exposed area includes a plurality of the first grooves, and the plurality of the first grooves form a bonding area.

3. The battery cell according to claim 2, wherein, The opening of the first groove is circular, and a diameter R1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

4. The battery cell according to claim 3, characterized in that, A diameter R1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

5. The battery cell according to claim 2, wherein, The opening of the first groove is square, and the side length A1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

6. The battery cell according to claim 5, characterized in that, A side length A1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

7. The battery cell according to claim 2, characterized in that, In the thickness direction of the first wall, a depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

8. The battery cell according to claim 7, wherein In the thickness direction of the first wall, a depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

9. The battery cell according to any one of claims 1-8, characterized in that, The groove includes a second groove, the second groove includes a first groove section and a second groove section, the first groove section and the second groove section are arranged along the thickness direction of the first wall, and the first groove section is closer to the outer surface of the first wall than the second groove section; Wherein, the diameter of the first slot section is smaller than the diameter of the second slot section.

10. The battery cell according to claim 9, characterized in that, The second groove includes a third groove section, the third groove section, the first groove section and the second groove section are arranged in sequence along the thickness direction of the first wall, one end of the third groove section extends to the outer surface of the first wall, and the other end is connected to the first groove section; Wherein, the diameter of the first slot segment is smaller than the diameter of the third slot segment.

11. The battery cell according to claim 9, wherein, The diameter R2 of the first groove segment is greater than or equal to 1 mm and less than or equal to 3 mm.

12. The battery cell according to claim 9, wherein, A diameter R3 of the second groove segment is greater than or equal to 1.5 mm and less than or equal to 4 mm.

13. The battery cell according to claim 10, characterized in that, The diameter R4 of the third groove segment is greater than or equal to 2 mm and less than or equal to 4 mm.

14. The battery cell according to claim 9, wherein In the thickness direction of the first wall, a depth D2 of the second groove is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

15. The battery cell according to claim 9, characterized in that, In the thickness direction of the first wall, a depth D3 of the first groove segment is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

16. The battery cell according to claim 9, characterized in that, In the thickness direction of the first wall, a depth D4 of the second groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

17. The battery cell according to claim 10, characterized in that, In the thickness direction of the first wall, a depth D5 of the third groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

18. The battery cell according to claim 1, characterized in that, The outer shell further includes a second wall and a side wall. Along the thickness direction of the first wall, the second wall is disposed opposite to the first wall, and the side wall surrounds the first wall and the second wall. The insulating member includes a first insulating member and a second insulating member that are separately provided. The first insulating member covers a part of the outer surface of the first wall, and the second insulating member covers at least a part of the outer surface of the second wall and at least a part of the outer surface of the side wall.

19. The battery cell according to claim 18, wherein The second insulating member has a flanging portion. The flanging portion is disposed along the circumferential direction of the first wall and is located on the outer surface of the first wall. The flanging portion and the edge of the first insulating member jointly enclose the first hollow area.

20. The battery cell according to claim 1, characterized in that, The battery cell further includes an electrode terminal, and the electrode terminal is disposed on the first wall. The insulating member is provided with a second hollow area. The second hollow area is spaced apart from the first hollow area, and the electrode terminal passes through the second hollow area.

21. The battery cell according to claim 1, characterized in that, The outer shell includes a housing and an end cover. The housing includes a bottom wall and a plurality of side walls. The bottom wall and the end cover are disposed opposite to each other along the thickness direction of the first wall. The plurality of side walls surround the bottom wall. One end of the plurality of side walls is connected to the bottom wall, and the other end forms an opening. The end cover closes the opening, and the end cover is the first wall.

22. A battery device, characterized in that, Comprising: A box body; A plurality of battery cells as described in any one of claims 1-21, disposed in the box body; An adhesive layer, disposed in the exposed area; A connecting member, disposed in the box body. Along the thickness direction of the first wall, at least one side of the connecting member is connected to the adhesive layer to connect the plurality of battery cells.

23. The battery device according to claim 22, characterized in that, The exposed area is provided with a groove, and at least a part of the adhesive layer is located in the groove.

24. The battery device according to any one of claims 22-23, characterized in that, The exposed area is provided with a protrusion, and the protrusion is completely embedded in the adhesive layer.

25. The battery device according to claim 22, wherein, The battery device further includes a connecting layer. Along the thickness direction of the first wall, the connecting layer connects the exposed area and the adhesive layer, and the material of the connecting layer is a coupling agent.

26. An electrical device, characterized in that, Comprising a battery cell as described in any one of claims 1-21 or a battery device as described in any one of claims 22-25, and the battery cell or the battery device is used to provide electrical energy for the electrical device.

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