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. A battery cell includes a housing, an electrode assembly, an electrode terminal, and an insulator. The housing has a first wall and a second wall disposed opposite to each other in a first direction. The electrode assembly is housed within the housing. The electrode terminal is arranged on the first wall. And the insulating part covers the outer side of the shell and covers a part of the outer surface of the second 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 second wall, an exposed area is formed in the position, corresponding to the first hollow-out area, of the outer surface of the second 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 shell, an electrode assembly, an electrode terminal and an insulating member. The shell has a first wall and a second wall arranged opposite to each other along a first direction. The electrode assembly is accommodated in the shell. The electrode terminal is arranged on the first wall. The insulating member is coated on the outer side of the shell and covers a portion of the outer surface of the second wall. Among them, the insulating member is provided with a first hollow area, the first hollow area is located on the side of the second wall away from the electrode assembly, and the outer surface of the second 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, and by arranging grooves and / or protrusions in the exposed area of the second wall, 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 first direction, the second wall has a thickness E, and the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5*E.

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

[0020] In some embodiments, in the first direction, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.1 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 impact on the structural strength of the second 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 first direction, and the first groove segment is closer to the outer surface of the second wall than the second groove segment. Among them, 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 first direction. One end of the third groove section extends to the outer surface of the second wall, and the other end communicates with the first groove section. Wherein, 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 sequentially passes through the third groove section, the first groove section, and enters the second groove section. 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. Bonding is performed through the adhesive layer in 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 satisfies 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 satisfies 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 satisfies 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 first direction, 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 exposed area of the adhesive layer falling off, while reducing the risk of affecting the structural strength of the second wall, and improving the bonding reliability between the adhesive layer and the exposed area.

[0034] In some embodiments, in the first direction, the depth D3 of the first groove section 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 section meets the above conditions, which is easy to process, while 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.

[0036] In some embodiments, in the first direction, the depth D4 of the second groove section 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 section meets the above conditions, which is easy to process, while 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.

[0038] In some embodiments, in the first direction, the depth D5 of the third groove section 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 section 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 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 oppositely arranged in the first direction. 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. The end cover is the first wall, and the bottom wall is the second wall.

[0041] In the technical solution of the embodiment of the present application, the end cover is the first wall and the bottom wall is the second wall, increasing the friction between the bottom wall and the adhesive layer, reducing the risk of the adhesive layer falling off from the bottom wall, improving the bonding reliability between the adhesive layer and the bottom wall, thereby improving the reliability of the connection between the bottom wall and the box body, and improving the reliability of the battery device.

[0042] In a second aspect, the present application further provides a battery device. The battery device includes a box body, an adhesive layer, and a 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. Wherein, the box body includes a connecting component, and the exposed area is bonded to the connecting component through the adhesive layer.

[0043] In the technical solution of the embodiment of the present application, the adhesive layer is disposed in the exposed area to connect the battery cell and the connecting component, thereby improving the reliability of the connection between the battery cell and the box body, and improving the reliability of the battery device.

[0044] 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.

[0045] 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 connection between the battery cell and the box body, and improving the reliability of the battery device.

[0046] In some embodiments, the exposed area is provided with a protrusion, and the protrusion is completely embedded in the adhesive layer.

[0047] 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 connection between the battery cell and the box body, and improving the reliability of the battery device.

[0048] In some embodiments, the battery device further includes a connection layer. In a first direction, the connection layer connects the exposed area and the adhesive layer, and the material of the connection layer is a coupling agent.

[0049] 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 connection between the battery cell and the box body is improved, and the reliability of the battery device is improved.

[0050] 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. The battery cell or the battery device is used to provide electrical energy for the electrical device.

[0051] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used 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 limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0053] Figure 1 Structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0054] Figure 2 Exploded view of the battery device provided in some embodiments of the present application;

[0055] Figure 3 Exploded view of the battery cell provided in some embodiments of the present application;

[0056] Figure 4 Schematic structural diagram of the battery cell provided in some embodiments of the present application;

[0057] Figure 5 Cross-sectional view of the second wall provided in some embodiments of the present application;

[0058] Figure 6 Cross-sectional view of the second wall provided in some other embodiments of the present application;

[0059] Figure 7 Cross-sectional view of the second wall provided in some further embodiments of the present application;

[0060] Figure 8 Schematic diagram of the exposed area provided in some embodiments of the present application;

[0061] Figure 9 Schematic diagram of the exposed area provided in some other embodiments of the present application;

[0062] Figure 10 Schematic diagram of the second groove provided in some embodiments of the present application;

[0063] Figure 11 Schematic diagram of the second groove provided in some other embodiments of the present application;

[0064] Figure 12 Schematic diagram of the connection between the exposed area and the connecting component provided in some embodiments of the present application;

[0065] Figure 13 Schematic diagram of the connection between the exposed area and the connecting component provided in some other embodiments of the present application;

[0066] Figure 14 Schematic diagram of the connection between the exposed area and the connecting component provided in some further embodiments of the present application.

[0067] Icons: 1 - battery cell; 10 - housing; 11 - first wall; 12 - second wall; 121 - exposed area; 1211 - groove; 12111 - first groove; 121111 - bonding area; 12112 - second groove; 12113 - first groove section; 12114 - second groove section; 12115 - third groove section; 1212 - protrusion; 13 - housing body; 131 - side wall; 132 - bottom wall; 14 - end cap; 20 - electrode assembly; 30 - insulating part; 31 - first 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 - first direction. Detailed implementation manners

[0068] 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.

[0069] 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, rather than to describe a specific order or primary - secondary relationship.

[0070] 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.

[0071] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "linked", and "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 a direct connection, or an indirect connection through an intermediate medium, and it 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.

[0072] In the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the present application, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0073] The term "a plurality of" as used 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).

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] As an example, the battery case may include a first case and a second case. The first case and the second case are snapped together so that a closed space is formed inside the battery case to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first case can be a top cover or a bottom plate.

[0080] As an example, the battery case 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 battery case to accommodate the battery cell assembly.

[0081] As an example, the battery case can be part of the chassis structure of a vehicle. For example, the top cover of the battery case can become at least part of the floor of the vehicle, or the frame of the battery case can become at least part of the cross beams and longitudinal beams of the vehicle.

[0082] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a battery case with a door provided on at least one side thereof. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0083] 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 to continue to be used.

[0084] 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.

[0085] As an example, the battery cell can be a pouch battery cell.

[0086] 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 short circuit between the positive and negative electrodes and allow active ions to pass through at the same time.

[0087] 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.

[0088] 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 either or both of the two opposite surfaces of the positive electrode current collector.

[0089] 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 substrate 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.).

[0090] 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.

[0091] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In some embodiments, the separator is a diaphragm. The present application has no particular limitation on the type of the diaphragm, and any well-known porous structure diaphragm with good chemical stability and mechanical stability can be selected.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Currently, a battery cell assembly is housed in a box by directly fixing a plurality of battery cells to the box, and the fixing method is to directly adhere the battery cells to the box.

[0101] 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.

[0102] 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 and a second wall arranged opposite to each other along a first direction. The insulating member is coated on the outside of the shell and covers a portion of the outer surface of the second wall. Among them, the insulating member is provided with a first hollow area, the first hollow area is located on the side of the second wall away from the electrode assembly, and the outer surface of the second 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.

[0103] By providing grooves and / or protrusions in the exposed area of the second wall, 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.

[0104] 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, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0105] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0106] 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 provided inside the vehicle 1000, and the battery device 100 can be arranged 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 the 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.

[0107] 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.

[0108] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] 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.

[0110] 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 cells 1 are accommodated in the box body 110. Among them, the box body 110 is used to provide an accommodation space for the battery cells 1, and the box body 110 may 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 cells 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.

[0111] In the battery device 100, there may be multiple battery cells 1. The multiple battery cells 1 may be connected in series, in parallel, or in a hybrid connection. A hybrid 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 hybrid 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 hybrid connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a hybrid 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.

[0112] 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.

[0113] 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 housing body 13. Multiple wall portions of the housing body 13, that is, multiple wall portions of the housing 10, enclose a cavity, and this cavity may be used to accommodate the electrode assemblies 20. The housing body 13 is determined according to the shape after the combination of one or more electrode assemblies 20. For example, the housing body 13 may be a hollow cuboid, cube, or regular polyhedron, and one of the faces of the housing body 13 has an opening so that one or more electrode assemblies 20 can be placed in the housing body 13. The housing body 13 is filled with an electrolyte, such as an electrolyte solution.

[0114] The battery cell 1 may further include two electrode terminals 40, and the two electrode terminals 40 may be disposed on the end cap 14. The end cap 14 is generally in a flat plate shape, and the two electrode terminals 40 are fixed on the flat plate surface of the end cap 14. 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 disposed in the battery cell 1.

[0115] Please refer to Figure 3 and 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, electrode terminals 40, and an insulating member 30. The housing 10 has a first wall 11 and a second wall 12 oppositely disposed along a first direction X. The electrode assembly 20 is received in the housing 10. The electrode terminals 40 are disposed on the first wall 11. The insulating member 30 is coated on the outer side of the housing 10 and covers a part of the outer surface of the second wall 12. Wherein, the insulating member 30 is provided with a first hollowed-out area 31, and the first hollowed-out area 31 is located on a side of the second wall 12 away from the electrode assembly 20, and an exposed area 121 is formed on the outer surface of the second wall 12 at a position corresponding to the first hollowed-out area 31. The exposed area 121 is provided with a groove 1211 and / or a protrusion 1212.

[0116] 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.

[0117] In some embodiments, the first direction X may be represented by the direction indicated by the letter X in the figure.

[0118] In some embodiments, the first direction X may be parallel to the thickness direction of the first wall 11.

[0119] In some embodiments, the housing 10 has a first wall 11 and a second wall 12 oppositely disposed along the first direction X. The first wall 11 may be an end cap 14, and the second wall 12 may be a bottom wall 132.

[0120] In some embodiments, the electrode assembly 20 is received in the housing 10, and the outer surface of the second wall 12 is the surface of the second wall 12 away from the electrode assembly 20.

[0121] 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 second wall 12 by means of bonding, clamping, welding, etc.

[0122] 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, thereby reducing the risk of short circuit of the battery cell 1 during use.

[0123] In some embodiments, the insulating member 30 is provided with a first hollowed-out area 31. The insulating member 30 covers a part of the surface of the second wall 12, and the first hollowed-out area 31 corresponds to another part of the surface of the second wall 12, so that the second wall 12 forms an exposed area 121 at the 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 the second wall 12 of the housing 10 has an area avoided by the first hollowed-out area 31, thereby forming an exposed area 121 on the second wall 12 that is not covered by the insulating member 30.

[0124] In some embodiments, the number of the first hollowed-out areas 31 provided on the insulating member 30 can be one or more.

[0125] 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 121 on the second wall 12, so as to increase the connection strength between the second wall 12 and the connecting member 130.

[0126] In some embodiments, the first hollowed-out area 31 can be rectangular, and correspondingly, the exposed area 121 formed on the second wall 12 is also rectangular.

[0127] In some embodiments, the first hollowed-out area 31 can also be triangular, pentagonal, circular, oval, etc.

[0128] In some embodiments, the exposed area 121 is used to connect with the connecting member 130, and the connection manner between the exposed area 121 and the connecting member 130 can be bonding.

[0129] Please refer to Figure 5 , Figure 5 which is a cross-sectional view of the second wall provided in some embodiments of the present application. In some embodiments, the exposed area 121 can be provided with a groove 1211. The processing method of the groove 1211 can be machining.

[0130] Please refer to Figure 6 , Figure 6 which is a cross-sectional view of the second wall provided in some other embodiments of the present application. In some embodiments, the exposed area 121 can be provided with a protrusion 1212. The processing method of the protrusion 1212 can be extrusion.

[0131] Please refer to Figure 7 , Figure 7A cross-sectional view of the second wall provided by some other embodiments of the present application. In some embodiments, the exposed area 121 may be provided with both a groove 1211 and a protrusion 1212 simultaneously.

[0132] In some embodiments, when the adhesive layer 120 is provided in the exposed area 121, the adhesive layer 120 will adhere to the wall surface of the groove 1211, thereby increasing the contact area between the adhesive layer 120 and the exposed area 121.

[0133] In some embodiments, when the adhesive layer 120 is provided in the exposed area 121, the adhesive layer 120 will adhere to the wall surface of the protrusion 1212, thereby increasing the contact area between the adhesive layer 120 and the exposed area 121.

[0134] 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 1211 and / or the protrusion 1212 in the exposed area 121 of the second wall 12, the friction between the exposed area 121 and the adhesive layer 120 is increased, the risk of the adhesive layer 120 falling off from the exposed area 121 is reduced, the bonding reliability between the adhesive layer 120 and the exposed area 121 is improved, thereby improving the reliability of the connection between the battery cell 1 and the box body 110 and the reliability of the battery device 100.

[0135] 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 some other embodiments of the present application. In some embodiments, the groove 1211 includes a first groove 12111, and the exposed area 121 includes a plurality of first grooves 12111, and the plurality of first grooves 12111 form a bonding area 121111.

[0136] In some embodiments, the number of the first grooves 12111 may be multiple, and the openings of the plurality of first grooves 12111 may be circular, square or other shapes.

[0137] In some embodiments, the first grooves 12111 may be arranged in different ways to form an embossed pattern, and the embossed pattern is the bonding area 121111. The embossed pattern may be the shape of a specific object, such as a flower, an animal, etc., or an irregular shape. It should be noted that on the exposed area 121, the adhesive layer 120 is also provided in the area other than the bonding area 121111.

[0138] In some embodiments, in the first direction X, the inner diameter of the first groove 12111 may remain unchanged.

[0139] In some embodiments, in the first direction X, the inner diameter of the first groove 12111 may vary, and the form of variation may be a linear variation or an irregular variation.

[0140] In the technical solution of the embodiment of the present application, a plurality of first grooves 12111 are provided for connecting with the adhesive layer 120, further improving the bonding reliability between the adhesive layer 120 and the exposed area 121, thereby improving the reliability of connecting the battery cell 1 to the box body 110 and enhancing the reliability of the battery device 100.

[0141] Please refer to Figure 8 , in some embodiments, the opening of the first groove 12111 is circular, and the diameter R1 of the opening of the first groove 12111 is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0142] In some embodiments, the diameter R1 of the opening of the first groove 12111 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.

[0143] In some embodiments, the opening diameters R1 of the plurality of first grooves 12111 may all be the same, partially the same, or all different.

[0144] In the technical solution of the embodiment of the present application, when the opening diameter of the first groove 12111 satisfies the above conditions, it is easy to process and at the same time improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0145] Please refer to Figure 8 , in some embodiments, the diameter R1 of the opening of the first groove 12111 is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0146] In some embodiments, the diameter R1 of the opening of the first groove 12111 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.

[0147] In the technical solution of the embodiment of the present application, when the opening diameter of the first groove 12111 satisfies the above conditions, it is easy to process and further improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0148] Please refer to Figure 8, in some embodiments, the opening of the first groove 12111 is square, and the side length A1 of the opening of the first groove 12111 is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0149] In some embodiments, the side length A1 of the opening of the first groove 12111 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.

[0150] In some embodiments, the side lengths A1 of the openings of the plurality of first grooves 12111 may all be the same, partially the same, or all different.

[0151] For the technical solution of the embodiment of the present application, the side length of the opening of the first groove 12111 satisfies the above conditions, which is easy to process and improves the bonding reliability between the bonding layer 120 and the exposed area 121.

[0152] 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.

[0153] In some embodiments, the side length A1 of the opening of the first groove 12111 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.

[0154] For the technical solution of the embodiment of the present application, the side length of the opening of the first groove 12111 satisfies the above conditions, which is easy to process and further improves the bonding reliability between the bonding layer 120 and the exposed area 121.

[0155] Please refer to Figure 5 , in some embodiments, in the first direction X, the second wall 12 has a thickness E, and the depth D1 of the first groove 12111 is greater than or equal to 0.08 mm and less than or equal to 0.5E.

[0156] In some embodiments, in the first direction X, the depth D1 of the first groove 12111 may satisfy the condition: 0.08 mm ≤ D1 ≤ 0.5E. For example, D1 may be a specific value among 0.08 mm, 0.1E, 0.2E, 0.3E, 0.4E, 0.5E or a value between any two of them.

[0157] In some embodiments, the depths D1 of the plurality of first grooves 12111 may all be the same, partially the same, or all different.

[0158] In some embodiments, in the first direction X, the thickness E of the second wall 12 may be 1.5 mm, 2 mm, 3 mm, etc.

[0159] In the technical solution of the embodiment of the present application, the depth of the first groove 12111 satisfies the above conditions, reducing the impact on the structural strength of the second wall 12, and at the same time improving the bonding reliability between the bonding layer 120 and the exposed area 121.

[0160] Please refer to Figure 5 In some embodiments, in the first direction X, the depth D1 of the first groove 12111 is greater than or equal to 0.08 mm and less than or equal to 0.1 mm.

[0161] In some embodiments, the depth D1 of the first groove 12111 may satisfy the condition: 0.08 mm ≤ D1 ≤ 0.1 mm. For example, D1 may be a specific value among 0.08 mm, 0.09 mm, 0.1 mm or a value between any two of them.

[0162] In the technical solution of the embodiment of the present application, the depth of the first groove 12111 satisfies the above conditions, further reducing the impact on the structural strength of the second wall 12, and at the same time improving the bonding reliability between the bonding layer 120 and the exposed area 121.

[0163] Please refer to Figure 9 and refer to Figure 10 , Figure 10 is a schematic diagram of a second groove provided in some embodiments of the present application. In some embodiments, the groove 1211 includes a second groove 12112, and the second groove 12112 includes a first groove segment 12113 and a second groove segment 12114. The first groove segment 12113 and the second groove segment 12114 are arranged along the first direction X, and the first groove segment 12113 is closer to the outer surface of the second wall 12 than the second groove segment 12114. Among them, the diameter of the first groove segment 12113 is smaller than the diameter of the second groove segment 12114.

[0164] In some embodiments, the second groove 12112 may be formed by injection molding.

[0165] In some embodiments, in the first direction X, the first groove segment 12113 and the second groove segment 12114 are arranged in sequence, and the first groove segment 12113 is connected to one end of the second groove segment 12114 facing away from the electrode assembly 20.

[0166] In some embodiments, the second groove 12112 may only include a first groove segment 12113 and a second groove segment 12114, and one end of the first groove segment 12113 facing away from the second groove segment 12114 extends to the outer surface of the second wall 12.

[0167] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 121, the adhesive layer 120 enters the first groove segment 12113 and the second groove segment 12114. Since the diameter of the first groove segment 12113 is smaller than that of the second groove segment 12114, the adhesive layer 120 will contact or abut against the inner wall of the second groove segment 12114 facing away from the electrode assembly 20, so that the adhesive layer 120 is not easily detached from the second groove segment 12114.

[0168] In some embodiments, in the first direction X, the diameter of the first groove segment 12113 may remain unchanged.

[0169] In some embodiments, in the first direction X, the diameter of the first groove segment 12113 may change.

[0170] In some embodiments, in the first direction X, the diameter of the second groove segment 12114 may remain unchanged.

[0171] In some embodiments, in the first direction X, the diameter of the first groove segment 12113 may be deformed.

[0172] It should be noted that the diameter of the connection portion of the first groove segment 12113 and the second groove segment 12114 is smaller than the diameter of the connection portion of the second groove segment 12114 and the first groove segment 12113.

[0173] In the technical solution of the embodiment of the present application, the adhesive layer 120 enters the second groove segment 12114 from the first groove segment 12113. The diameter of the first groove segment 12113 of the second groove 12112 is smaller than the diameter of the second groove segment 12114, reducing the risk of the adhesive layer 120 falling off from the second groove segment 12114 and improving the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0174] 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 12112 includes a third groove segment 12115. The third groove segment 12115, the first groove segment 12113, and the second groove segment 12114 are arranged in sequence along the first direction X. One end of the third groove segment 12115 extends to the outer surface of the second wall 12, and the other end is communicated with the first groove segment 12113. Among them, the diameter of the first groove segment 12113 is smaller than the diameter of the third groove segment 12115.

[0175] In some embodiments, the second groove 12112 may further include a third groove segment 12115. In the first direction X, the third groove segment 12115, the first groove segment 12113, and the second groove segment 12114 are arranged in sequence. The first groove segment 12113 is connected to one end of the second groove segment 12114 away from the electrode assembly 20, and the third groove segment 12115 is connected to one end of the first groove segment 12113 away from the electrode assembly 20. One end of the third groove segment 12115 away from the first groove segment 12113 extends to the outer surface of the second wall 12.

[0176] In some embodiments, the number of the second grooves 12112 may be multiple. Some of the second grooves 12112 may include the first groove segment 12113, the second groove segment 12114, and the third groove segment 12115, and some of the other second grooves 12112 may only include the first groove segment 12113 and the second groove segment 12114.

[0177] In some embodiments, the number of the second grooves 12112 may be multiple, and all the second grooves 12112 may include the first groove segment 12113, the second groove segment 12114, and the third groove segment 12115.

[0178] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 121, the adhesive layer 120 enters the third groove segment 12115, the first groove segment 12113, and the second groove segment 12114. Since the diameter of the third groove segment 12115 is larger than that of the first groove segment 12113, the contact area between the adhesive layer 120 and the connecting component 130 is relatively large.

[0179] In some embodiments, in the first direction X, the diameter of the third groove segment 12115 may remain unchanged.

[0180] In some embodiments, in the first direction X, the diameter of the third groove segment 12115 may change.

[0181] In some embodiments, in the first direction X, the diameter of the third groove segment 12115 may remain unchanged.

[0182] In some embodiments, in the first direction X, the diameter of the third groove segment 12115 may change.

[0183] It should be noted that the diameter of one end of the third groove segment 12115 away from the electrode assembly 20 may be larger than the diameter of one end of the first groove segment 12113 away from the electrode assembly 20.

[0184] In the technical solution of the embodiment of the present application, the adhesive layer 120 sequentially passes through the third groove section 12115 and the first groove section 12113 and enters the second groove section 12114. The diameter of the first groove section 12113 of the second groove 12112 is smaller than the diameter of the second groove section 12114, and the diameter of the first groove section 12113 of the second groove 12112 is smaller than the diameter of the third groove section 12115, reducing the risk of the adhesive layer 120 falling off from the second groove section 12114. The adhesive layer 120 in the third groove section 12115 is used for bonding, increasing the bonding area and improving the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0185] Please refer to Figure 10 , in some embodiments, the diameter R2 of the first groove section 12113 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0186] In some embodiments, the diameter R2 of the first groove section 12113 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.

[0187] In some embodiments, the number of the second grooves 12112 may be multiple. The diameters R2 of the multiple first groove sections 12113 may all be the same, or partially the same, or all different.

[0188] In the technical solution of the embodiment of the present application, when the diameter of the first groove section 12113 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 12114 and improving the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0189] Please refer to Figure 10 , in some embodiments, the diameter R3 of the second groove section 12114 is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0190] In some embodiments, the diameter R3 of the second groove section 12114 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.

[0191] In some embodiments, the number of the second grooves 12112 may be multiple. The diameters R3 of the multiple second groove sections 12114 may all be the same, or partially the same, or all different.

[0192] In the technical solution of the embodiment of the present application, the diameter of the second groove section 12114 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 12114 and improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0193] Please refer to Figure 11 , in some embodiments, the diameter R4 of the third groove section 12115 is greater than or equal to 2 mm and less than or equal to 4 mm.

[0194] In some embodiments, the diameter R4 of the third groove section 12115 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.

[0195] In some embodiments, the number of the second grooves 12112 may be multiple. The diameters R4 of the multiple third groove sections 12115 may all be the same, or partially the same, or all different.

[0196] In the technical solution of the embodiment of the present application, the diameter of the third groove section 12115 meets the above conditions. While increasing the bonding area, it reduces the risk of the adhesive layer 120 falling off from the exposed area 121 and improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0197] Please refer to Figure 11 , in some embodiments, in the first direction X, the depth D2 of the second groove 12112 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0198] In some embodiments, the depth D2 of the second groove 12112 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.

[0199] In some embodiments, the depths D2 of the multiple second grooves 12112 may all be the same, or partially the same, or all different.

[0200] It should be noted that in the first direction X, the depth D2 of the second groove 12112 is less than the thickness of the second wall 12.

[0201] In some embodiments, the number of the second grooves 12112 may be multiple. The depths D2 of the multiple second grooves 12112 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 depth of the second groove 12112 satisfies the above conditions, reducing the risk of the exposed area 121 of the adhesive layer 120 falling off, and at the same time reducing the risk of affecting the structural strength of the second wall 12, and improving the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0203] Please refer to Figure 10 , in some embodiments, in the first direction X, the depth D3 of the first groove segment 12113 is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

[0204] In some embodiments, the depth D3 of the first groove segment 12113 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.

[0205] In some embodiments, the number of the second grooves 12112 may be multiple. The depths D3 of the first groove segments 12113 of the multiple second grooves 12112 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 depth of the first groove segment 12113 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 12114, and improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0207] Please refer to Figure 10 , in some embodiments, in the first direction X, the depth D4 of the second groove segment 12114 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0208] In some embodiments, the depth D4 of the second groove segment 12114 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.

[0209] In some embodiments, the number of the second grooves 12112 may be multiple. The depths D4 of the second groove segments 12114 of the multiple second grooves 12112 may all be the same, may be partially the same, or may all be different.

[0210] In the technical solution of the embodiment of the present application, the depth of the second groove segment 12114 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 12114, and improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0211] Please refer to Figure 11 , in some embodiments, in the first direction X, the depth D5 of the third groove segment 12115 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0212] In some embodiments, the depth D5 of the third groove segment 12115 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.

[0213] In some embodiments, the number of the second grooves 12112 may be multiple. The depths D5 of the third groove segments 12115 of the multiple second grooves 12112 may all be the same, may be partially the same, or may all be different.

[0214] In the technical solution of the embodiment of the present application, the depth of the third groove segment 12115 satisfies the above conditions. While being easy to process, it reduces the risk of the adhesive layer 120 peeling off from the exposed area 121 and improves the bonding reliability between the adhesive layer 120 and the exposed area 121.

[0215] Please refer to Figure 3 and Figure 4 , in some embodiments, the housing 10 includes a housing body 13 and an end cover 14. The housing body 13 includes a bottom wall 132 and a plurality of side walls 131. The bottom wall 132 and the end cover 14 are disposed opposite to each other in the first direction X. The plurality of side walls 131 surround the bottom wall 132. One ends of the plurality of side walls 131 are connected to the bottom wall 132, and the other ends form an opening. The end cover 14 closes the opening. The end cover 14 is the first wall 11, and the bottom wall 132 is the second wall 12.

[0216] In some embodiments, the second wall 12 and the side walls 131 enclose a hollow structure with an opening at one end in the first direction X, and the first wall 11 covers the opening to form a housing 10 for accommodating the electrode assembly 20.

[0217] In some embodiments, the second wall 12 and the side walls 131 may also be a split structure, that is, the side walls 131 are a hollow structure with openings at both ends in the first direction X, and the first wall 11 and the second wall 12 respectively cover the two openings of the side walls 131.

[0218] In some embodiments, the second wall 12 and the side walls 131 are an integrally formed structure, that is, the second wall 12 and the side walls 131 of the housing 10 are made by an integral forming process, such as stamping or casting.

[0219] In some embodiments, the first wall 11 may be an end cap 14, and the second wall 12 may be a bottom wall 132. The electrode terminal 40 is disposed on the end cap 14. The exposed area 121 is located on the bottom wall 132.

[0220] In the technical solution of the embodiment of the present application, the end cap 14 is the first wall 11, and the bottom wall 132 is the second wall 12, which increases the friction between the bottom wall 132 and the adhesive layer 120, reduces the risk of the adhesive layer 120 falling off from the bottom wall 132, improves the bonding reliability between the adhesive layer 120 and the bottom wall 132, thereby improving the reliability of the connection between the bottom wall 132 and the box body 110, and improving the reliability of the battery device 100.

[0221] Please refer to Figure 2 and refer to Figure 12 and Figure 13 , Figure 12 is a schematic diagram of the connection between the exposed area and the connecting component provided by some embodiments of the present application, Figure 13 is a schematic diagram of the connection between the exposed area and the connecting component provided by other embodiments of the present application. The embodiment of the present application also provides a battery device 100. The battery device 100 includes a box body 110, an adhesive layer 120, and the battery cell 1 of any one of the first aspects. The battery cell 1 is disposed in the box body 110. The adhesive layer 120 is disposed in the exposed area 121. Wherein, the box body 110 includes a connecting component 130, and the exposed area 121 is bonded to the connecting component 130 through the adhesive layer 120.

[0222] In some embodiments, the battery cell 1 is placed in 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 first direction X. 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 actual use, the second wall 12 of the outer shell 10 is arranged facing the ground or downward, so that the first direction X is the up and down direction.

[0223] Wherein, the connecting component 130 is bonded to the exposed area 121 formed with the second wall 12 in the first direction X.

[0224] In some embodiments, the connecting component 130 may be the inner wall of the box body 110 or a thermal management component, such as a heat exchange plate. The connecting component 130 is bonded to the second wall 12 of the battery cell 1 through the adhesive layer 120.

[0225] In some embodiments, the adhesive layer 120 may be a glue layer.

[0226] In some embodiments, in the first direction X, one surface of the adhesive layer 120 is bonded to the exposed area 121, and the other surface is bonded to the connecting component 130.

[0227] In the technical solution of the embodiment of the present application, the adhesive layer 120 is disposed in the exposed area 121 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.

[0228] Please refer to Figure 12 , in some embodiments, the exposed area 121 is provided with a groove 1211, and at least a part of the adhesive layer 120 is located in the groove 1211.

[0229] In some embodiments, the groove 1211 in the exposed area 121 may be completely filled with the adhesive layer 120.

[0230] In some embodiments, a part of the space in the groove 1211 in the exposed area 121 may be filled with the adhesive layer 120.

[0231] In the technical solution of the embodiment of the present application, the adhesive layer 120 is disposed in the groove 1211, reducing the risk of the adhesive layer 120 falling off from the exposed area 121, 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.

[0232] Please refer to Figure 13 , in some embodiments, the exposed area 121 is provided with a protrusion 1212, and the protrusion 1212 is completely embedded in the adhesive layer 120.

[0233] In some embodiments, all outer surfaces of the protrusion 1212 in the exposed area 121 are in contact with the adhesive layer 120.

[0234] In the technical solution of the embodiment of the present application, the protrusion 1212 is embedded in the adhesive layer 120, reducing the risk of the adhesive layer 120 falling off from the exposed area 121, 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.

[0235] Please refer to Figure 14 , Figure 14 is a schematic diagram of 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. In the first direction X, the connecting layer 140 connects the exposed area 121 and the adhesive layer 120, and the material of the connecting layer 140 is a coupling agent.

[0236] In some embodiments, the material of the housing 10 may be metal.

[0237] In some embodiments, the material of the housing 10 may be aluminum metal.

[0238] In some embodiments, the material of the adhesive layer 120 may be synthetic resin.

[0239] In some embodiments, the coupling agent has the properties of being affinity for glue and affinity for metal. The molecule of the coupling agent has reaction groups that can chemically bond with inorganic materials (such as glass, silica sand, metal, etc.) and reaction groups that can chemically bond with organic materials (such as synthetic resins, etc.) at the same time.

[0240] In some embodiments, in the first direction X, one surface of the connection layer 140 can be connected to the exposed area 121, and the other surface can be connected to the adhesive layer 120.

[0241] 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 121, and both can be in contact with the connection component 130.

[0242] In the technical solution of the embodiment of the present application, the coupling agent has the properties of being affinity for the adhesive layer 120 and affinity for metal. The outer shell 10 of the battery cell 1 is made of metal, and the connection layer 140 is a coupling agent. The adhesive layer 120 and the exposed area 121 are connected through the connection layer 140, reducing the risk of the adhesive layer 120 falling off from the exposed area 121, improving the reliability of the connection between the battery cell 1 and the connection box 110, and improving the reliability of the battery device 100.

[0243] The embodiment of the present application also provides an electrical device, including the battery cell 1 or the battery device 100 according to any one of the above embodiments. The battery cell 1 or the battery device 100 is used to provide electrical energy for the electrical device.

[0244] Please refer to Figures 3 to 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 13 and an end cover 14. The housing 13 includes a bottom wall 132 and a plurality of side walls 131. The bottom wall 132 and the end cover 14 are disposed opposite to each other in the first direction X. The plurality of side walls 131 surround the bottom wall 132. One end of the plurality of side walls 131 is connected to the bottom wall 132, and the other end forms an opening. The end cover 14 closes the opening.

[0245] The insulating member 30 is coated on the outside of the outer shell 10 and covers the outer surface of the bottom wall 132. Among them, the insulating member 30 is provided with a first hollow area 31. The first hollow area 31 is located on the side of the bottom wall 132 facing away from the electrode assembly 20. An exposed area 121 is formed on the outer surface of the bottom wall 132 at a position corresponding to the first hollow area 31. The exposed area 121 is provided with a groove 1211.

[0246] In some embodiments, the groove 1211 includes a first groove 12111 and a second groove 12112. The number of the first grooves 12111 is plural, and the first grooves 12111 can be arranged in different ways to form an embossed pattern, and the embossed pattern is an adhesive area 121111.

[0247] The number of the second grooves 12112 is plural. The second groove 12112 includes a first groove section 12113, a second groove section 12114, and a third groove section 12115. The third groove section 12115, the first groove section 12113, and the second groove section 12114 are sequentially connected along the first direction X. One end of the third groove section 12115 extends to the outer surface of the bottom wall 132. Wherein, the diameter of the first groove section 12113 is smaller than the diameter of the third groove section 12115, and the diameter of the first groove section 12113 is smaller than the diameter of the second groove section 12114.

[0248] By providing the first groove 12111 and the second groove 12112 in the exposed area 121, the frictional force between the exposed area 121 and the adhesive layer 120 is increased, the risk of the adhesive layer 120 falling off from the exposed area 121 is reduced, the adhesion reliability between the adhesive layer 120 and the exposed area 121 is improved, thereby improving the reliability of connecting the battery cell 1 to the box body 110 and improving the reliability of the battery device 100.

[0249] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto 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 herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a first wall and a second wall oppositely disposed along a first direction; An electrode assembly accommodated within the housing; An electrode terminal disposed on the first wall; An insulating member coated on the outer side of the housing and covering a part of the outer surface of the second wall; Wherein, the insulating member is provided with a first hollowed-out area located on a side of the second wall facing away from the electrode assembly, and an exposed area is formed on the outer surface of the second wall at a position corresponding to the first hollowed-out 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, and the exposed area includes a plurality of the first grooves, and the plurality of the first grooves form an adhesive area.

3. The battery cell according to claim 2, wherein, The opening of the first groove is circular, and 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 1.2 mm.

4. The battery cell according to claim 3, characterized in that, 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.

5. The battery cell according to claim 2, characterized in that, 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 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.

7. The battery cell according to claim 2, wherein In the first direction, the second wall has a thickness E, and the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5*E.

8. The battery cell according to claim 7, wherein In the first direction, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.1 mm.

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

10. The battery cell according to claim 9, wherein, The second groove includes a third groove section, and the third groove section, the first groove section and the second groove section are arranged in sequence along the first direction, one end of the third groove section extends to the outer surface of the second wall, the other end is communicated with the first groove section, and one end of the first groove section facing away from the third groove section is communicated with the second groove section; Wherein, the diameter of the first groove section is smaller than the diameter of the third groove section, and the diameter of the first groove section is smaller than the diameter of the second groove section.

11. The battery cell according to any one of claims 9-10, characterized in that, The diameter R2 of the first groove section is greater than or equal to 1 mm and less than or equal to 3 mm.

12. The battery cell according to any one of claims 9-10, characterized in that, 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.

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

14. The battery cell according to any one of claims 9-10, characterized in that, In the first direction, 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.

15. The battery cell according to any one of claims 9-10, characterized in that, In the first direction, the depth D3 of the first groove section is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

16. The battery cell according to any one of claims 9-10, characterized in that, In the first direction, the depth D4 of the second groove section 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, wherein, In the first direction, the depth D5 of the third groove section 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 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 oppositely arranged in the first direction. 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. The end cover is the first wall, and the bottom wall is the second wall.

19. A battery device, characterized in that, Comprising: A box body; A plurality of battery cells as described in any one of claims 1-18, disposed in the box body; An adhesive layer, disposed in the exposed area; Wherein, the box body includes a connecting component, and the exposed area is adhered to the connecting component through the adhesive layer.

20. The battery device according to claim 19, 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.

21. The battery device according to any one of claims 19-20, characterized in that, The exposed area is provided with a protrusion, and the protrusion is completely embedded in the adhesive layer.

22. The battery device according to any one of claims 19-21, characterized in that, The battery device further includes a connecting layer. In the first direction, the connecting layer connects the exposed area and the adhesive layer, and the material of the connecting layer is a coupling agent.

23. An electrical device, characterized in that, Comprising a battery cell as described in any one of claims 1-18 or a battery device as described in any one of claims 19-22, and the battery cell or the battery device is used to provide electrical energy for the electrical device.

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