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 outer side of the shell is coated with the insulating part. Wherein the outer surface of the first wall comprises a covering area covered by the insulating part and an exposed area not covered by the insulating part, and the roughness of the exposed area is larger than that of the covering area. 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 more specifically, to a battery cell, a battery device, and an electrical device. Background Art

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

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

[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] The present application is implemented 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 outer side of the housing. Among them, the outer surface of the first wall includes a covered area covered by the insulating member and an exposed area not covered by the insulating member, and the roughness of the exposed area is greater than the roughness of the covered area.

[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 or realizes heat conduction between the battery cell and the box body. The adhesive layer is provided in the exposed area. By increasing the roughness of the exposed area, the friction 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, 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 enabling a good heat conduction effect between the box body and the battery cell, and improving the reliability of the battery device.

[0008] In some embodiments, the roughness Ra of the exposed area is greater than or equal to 0.4 um and less than or equal to 100 um.

[0009] According to the technical solution of the embodiment of the present application, when the roughness of the exposed area meets the above conditions, while improving the bonding reliability between the adhesive layer and the exposed area, it also has good convenience when cleaning the exposed area.

[0010] In some embodiments, the roughness Ra of the exposed area is greater than or equal to 0.8 um and less than or equal to 50 um.

[0011] According to the technical solution of the embodiment of the present application, the roughness of the exposed area meets the above conditions, which further improves the bonding reliability between the adhesive layer and the exposed area and makes it more convenient to clean the exposed area.

[0012] In some embodiments, the exposed area is provided with grooves and / or protrusions.

[0013] The technical solution of the embodiment of the present application increases the roughness of the exposed area by providing grooves and / or protrusions in the exposed area, thereby increasing the friction between the exposed area and the adhesive layer, reducing the risk of the adhesive layer falling off from the exposed area, and improving the reliability of the battery device.

[0014] In some embodiments, in the thickness direction of the first wall, a depth D1 of the groove is greater than or equal to 0.02 mm and less than or equal to 0.2 mm.

[0015] In the technical solution of the embodiment of the present application, the depth of the groove meets the above conditions, reducing the impact on the structural strength of the first wall, while improving the bonding reliability between the adhesive layer and the exposed area.

[0016] In some embodiments, in the thickness direction of the first wall, a depth D1 of the groove is greater than or equal to 0.02 mm and less than or equal to 0.1 mm.

[0017] In the technical solution of the embodiment of the present application, the depth of the groove meets the above conditions, further reducing the impact on the structural strength of the first wall, while improving the bonding reliability between the adhesive layer and the first exposed area.

[0018] In some embodiments, the number of the grooves is plural.

[0019] The technical solution of the embodiment of the present application uses multiple grooves for connection with the adhesive layer, thereby further improving the adhesion reliability between the adhesive layer and the exposed area, thereby improving the reliability of the battery device.

[0020] In some embodiments, the insulating member is provided with a first hollow area, the first hollow area is located on a side of the first wall away from the electrode assembly, and in the thickness direction of the first wall, the first hollow area corresponds to the exposed area.

[0021] The technical solution of the embodiment of the present application reduces the risk of interference with the insulating part when the battery cell is connected to the adhesive layer by setting a first hollow area in the area corresponding to the insulating part and the exposed area, improves the bonding reliability between the adhesive layer and the exposed area, and thus improves the reliability of the battery device.

[0022] In some embodiments, the outer shell includes a shell and an end cover, the shell includes a bottom wall and multiple side walls, the bottom wall and the end cover are arranged opposite to each other, the multiple side walls are arranged around the bottom wall, one end of the multiple 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.

[0023] 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 falling off from the end cover, improves the bonding reliability between the adhesive layer and the end cover, and thus improves the reliability of the battery device.

[0024] In some embodiments, 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 end cover, and the second insulating member covers at least a part of the outer surface of the bottom wall and at least a part of the outer surface of the side wall. The second insulating member has a first flanging portion, and the first flanging portion is arranged along the circumferential direction of the end cover and is located on the outer surface of the end cover. The first flanging portion and the edge of the first insulating member jointly enclose a first hollow area.

[0025] In the technical solution of the embodiment of the present application, by setting the insulator as a separately provided first insulating member and a 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 bottom wall, which is beneficial to reducing the assembly difficulty between the insulating member and the outer shell. At the same time, the second insulating member has a first flanging portion arranged along the circumferential direction of the end cover and located at the edge of the end cover, so that the edge of the first insulating member arranged on the end cover and a part of the first flanging portion jointly enclose a first hollow area to form an exposed area on the end cover. For a battery cell adopting this structure, on the one hand, it is not necessary to set the first insulating member as a structure with through holes, which is beneficial to improving the overall structural strength of the first insulating member, and on the other hand, it is beneficial to controlling the size and dimensions of the first hollow area.

[0026] In some embodiments, 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 oppositely arranged. 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 bottom wall is the first wall.

[0027] In the technical solution of the embodiment of the present application, the bottom wall is the first wall, which increases the friction between the bottom wall and the adhesive layer, reduces the risk of the adhesive layer falling off from the bottom wall, improves the bonding reliability between the adhesive layer and the bottom wall, and thus improves the reliability of the battery device.

[0028] In some embodiments, 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 end cover, and the second insulating member covers at least a part of the outer surface of the bottom wall and at least a part of the outer surface of the side wall. The second insulating member has a second flanging portion, and the second flanging portion is arranged along the circumferential direction of the bottom wall and is located on the outer surface of the bottom wall. The second flanging portion encloses a first hollow area.

[0029] In the technical solution of the embodiment of the present application, the second insulating member has a second flanging portion that is circumferentially arranged on the bottom wall and is located at the edge of the bottom wall, so that the edge of the second insulating member disposed on the bottom wall encloses a first hollowed-out area to form an exposed area on the bottom wall. For a battery cell with this structure, on the one hand, it is not necessary to set the second insulating member to have a through-hole structure, which is beneficial to improving the overall structural strength of the second insulating member; on the other hand, it is beneficial to control the size and dimensions of the first hollowed-out area.

[0030] In some embodiments, the outer casing includes a housing and an end cap. The housing includes a bottom wall and a plurality of side walls. The bottom wall and the end cap are disposed opposite to each other. 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 cap closes the opening. At least one of the plurality of side walls is a first wall.

[0031] In the technical solution of the embodiment of the present application, when the side wall is a first wall, the friction between the side wall and the adhesive layer is increased, the risk of the adhesive layer peeling off from the side wall is reduced, and the bonding reliability between the adhesive layer and the side wall is improved, thereby improving the reliability of the battery device.

[0032] In some embodiments, the insulating member includes a first insulating member and a second insulating member that are separately provided. The first insulating member covers at least a part of the outer surface of the end cap, and the second insulating member covers at least a part of the outer surface of the bottom wall and at least a part of the outer surface of the side wall. The first hollowed-out area is provided in the second insulating member.

[0033] In the technical solution of the embodiment of the present application, the second insulating member is provided with the first hollowed-out area, so that it is more convenient to dispose the second insulating member on the side wall and facilitate installation.

[0034] In some embodiments, the outer casing includes a housing and an end cap. The housing includes a bottom wall and a plurality of side walls. The bottom wall and the end cap are disposed opposite to each other. 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 cap closes the opening. The battery cell further includes an electrode terminal, and the electrode terminal is disposed on the end cap. The insulating member is provided with a second hollowed-out area, and the electrode terminal passes through the second hollowed-out area.

[0035] In the technical solution of the embodiment of the present application, the electrode terminal is disposed on the end cap, 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, reducing the risk of interference between the insulating member and the electrode terminal.

[0036] In some embodiments, the surface of the electrode terminal includes a first area for connecting with a heat exchange component, and the roughness of the first area is greater than that of the covering area.

[0037] In the technical solution of the embodiment of the present application, by increasing the roughness of the first region of the electrode terminal for connecting with the heat exchange component, the friction force between the first region and the adhesive layer is increased, the risk of the adhesive layer peeling off from the first region is reduced, and the bonding reliability between the adhesive layer and the first region is improved, so that there is a good heat conduction effect between the box body and the electrode terminal, and the reliability of the battery device is improved.

[0038] In some embodiments, the surface of the electrode terminal includes a first region for connecting with the heat exchange component and a second region for connecting with the bus bar component, and the roughness of the first region is greater than that of the second region.

[0039] In the technical solution of the embodiment of the present application, by increasing the roughness of the first region, the risk of the adhesive layer peeling off from the first region is reduced, and the reliability of the battery device is improved.

[0040] 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.

[0041] In a third aspect, the present application further provides an electrical device, including the battery cell according to any one of the embodiments in the first aspect or the battery device according to 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.

[0042] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for 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, other related drawings can also be obtained based on these drawings without creative efforts.

[0044] Figure 1 Structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0045] Figure 2 Explosion diagram of a battery device provided for some embodiments of the present application;

[0046] Figure 3 Explosion diagram of a battery cell provided for some embodiments of the present application;

[0047] Figure 4 Structural schematic diagram of a battery cell provided for some embodiments of the present application;

[0048] Figure 5 Schematic structural diagram of a battery cell provided for some other embodiments of the present application;

[0049] Figure 6 Cross-sectional view of a first wall provided for some embodiments of the present application;

[0050] Figure 7 Schematic structural diagram of a battery cell provided for some other embodiments of the present application;

[0051] Figure 8 Schematic structural diagram of a battery cell provided for some further embodiments of the present application;

[0052] Figure 9 Schematic internal structural diagram of a battery device provided for some embodiments of the present application;

[0053] Figure 10 Schematic diagram of the connection between an exposed area and a connection component provided for some embodiments of the present application.

[0054] Reference numerals: 1 - battery cell; 10 - housing; 11 - first wall; 111 - exposed area; 1111 - groove; 1112 - protrusion; 112 - covering area; 12 - housing body; 121 - bottom wall; 122 - side wall; 13 - end cap; 20 - electrode assembly; 30 - insulating member; 31 - first hollowed-out area; 32 - first insulating member; 33 - second insulating member; 331 - first flanging portion; 332 - second flanging portion; 34 - second hollowed-out area; 40 - electrode terminal; 41 - first area; 42 - second area; 100 - battery device; 110 - box body; 120 - adhesive layer; 130 - connection component; 140 - first sub-box body; 150 - second sub-box body; 1000 - vehicle; 1100 - controller; 1200 - motor; X - thickness direction of the first wall. Detailed implementation manners

[0055] 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.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0057] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "attached" shall 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 internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The term "and / or" in this application is merely a description of the association relationship of 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 this application generally represents an "or" relationship between the associated objects before and after.

[0060] The term "plurality" as used in this 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).

[0061] The battery device (Battery Apparatus) mentioned in the embodiments of this 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.

[0062] In some embodiments, a 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, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0063] In some embodiments, the battery device can be a 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.

[0064] 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.

[0065] 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.

[0066] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0067] As an example, the box body can 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 box body to accommodate the battery cell assembly.

[0068] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0069] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0070] In the embodiments of the present application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after the battery cell discharges and can be used continuously.

[0071] 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.

[0072] As an example, the battery cell can be a soft-pack battery cell.

[0073] A 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) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short - circuiting, and at the same time allow active ions to pass through.

[0074] In some embodiments, the positive electrode can be a positive electrode tab, and the positive electrode tab can include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0075] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is disposed on any one or both of the two opposite surfaces of the positive current collector.

[0076] As an example, the positive current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the 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 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 substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive active material can include at least one of the following materials: lithium - containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive active materials can also be used.

[0078] In some embodiments, the negative electrode can be a negative electrode tab, and the negative electrode tab can include a negative current collector.

[0079] As an example, the negative current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used.

[0080] In some embodiments, the negative current collector has two surfaces opposite to each other in its own thickness direction, and the negative active material is disposed on any one or both of the two opposite surfaces of the negative current collector.

[0081] As an example, the negative electrode active material can be the negative electrode active material for batteries 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 materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. 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.

[0082] 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.

[0083] As an example, the main material of the diaphragm can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The diaphragm can be a single-layer film or a multi-layer composite film, without particular limitation. When the diaphragm is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0085] Currently, from the perspective of the development of the market situation, battery devices have been widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as electric tools, drones, and energy storage devices. With the continuous expansion of the fields where batteries are used, the market demand is also continuously increasing.

[0086] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, with the change of environmental conditions and / or internal conditions of the battery, the reliability problem of the battery device is also one of the key factors to be considered.

[0087] Currently, the battery single cell components are accommodated in the box by directly fixing multiple battery cells to the box, and the fixing method is by bonding the battery cells to the box. In addition, the battery cells can also achieve heat conduction with the box by bonding with the box.

[0088] However, when the battery device is subject to external impact or after a period of time, there is a risk that the adhesive layer used to bond the battery cell will peel off from the battery cell, thereby affecting the reliability of the connection between the battery cell and the box body. There is a risk of failure in the connection between the battery cell and the box body and a risk of affecting the heat conduction effect between the box body and the battery cell, resulting in a risk of damage to the battery cell and affecting the reliability of the battery device.

[0089] Based on the above considerations, in order to solve the problem that the adhesive layer peels off from the battery cell, thereby affecting the poor reliability of the battery device, an embodiment of the present application provides a battery cell. The battery cell includes a housing and an insulating member. The housing has a first wall. The insulating member is coated on the outer side of the housing. Among them, the outer surface of the first wall includes a covered area covered by the insulating member and an exposed area not covered by the insulating member, and the roughness of the exposed area is greater than that of the covered area.

[0090] By increasing the roughness of the exposed area, the friction force between the first exposed area and the adhesive layer is increased, the risk of the adhesive layer peeling off from the exposed area is reduced, 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 enabling a better heat conduction effect between the box body and the battery cell, and improving the reliability of the battery device.

[0091] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, 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.

[0092] For the convenience of description in the following embodiments, a vehicle as an electrical device in an embodiment of the present application is taken as an example for description.

[0093] 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 provided 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-up, navigation, and operation of the vehicle 1000.

[0094] 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 power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0095] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also 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.

[0096] 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.

[0097] Please refer to Figure 2 , Figure 2 which is an exploded view of the battery device provided in 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 140 and a second sub-box body 150. The first sub-box body 140 and the second sub-box body 150 cover each other, and the first sub-box body 140 and the second sub-box body 150 jointly define an accommodation space for accommodating the battery cell 1. The first sub-box body 140 may be a hollow structure with one end open, and the second sub-box body 150 may be a plate-like structure. The second sub-box body 150 covers the open side of the first sub-box body 140 so that the first sub-box body 140 and the second sub-box body 150 jointly define an accommodation space; the first sub-box body 140 and the second sub-box body 150 may also both be hollow structures with one side open, and the open side of the first sub-box body 140 covers the open side of the second sub-box body 150.

[0098] In the battery device 100, there may be multiple battery cells 1. The multiple battery cells 1 can be connected in series, 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 can be directly connected in series, 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 can also be that multiple battery cells 1 are first connected in series, parallel, or in a hybrid connection to form a battery module form, and then multiple battery modules are connected in series, 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.

[0099] Among them, the battery cell 1 can be a secondary battery or a primary battery; the battery cell 1 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0100] Please refer to Figure 3 , Figure 3 which is an exploded view of the battery cell provided in 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 12, and a cavity is formed by a plurality of wall portions of the casing 12, i.e., a plurality of wall portions of the housing 10, and this cavity can be used to accommodate the electrode assembly 20. The casing 12 is determined according to the shape after combining one or more electrode assemblies 20. For example, the casing 12 can be a hollow cuboid, cube, or regular polyhedron, and one of the surfaces of the casing 12 has an opening so that one or more electrode assemblies 20 can be placed inside the casing 12. The casing 12 is filled with an electrolyte, such as an electrolyte solution.

[0101] The battery cell 1 may further include two electrode terminals 40, and the two electrode terminals 40 can be arranged on the end cap 13. The end cap 13 is generally in a flat plate shape, and the two electrode terminals 40 are fixed on the flat plate surface of the end cap 13. The two electrode terminals 40 are a positive electrode terminal and a negative electrode terminal respectively. In the battery cell 1, according to actual use requirements, the electrode assembly 20 can be set to be single or multiple, and a plurality of independent electrode assemblies 20 are arranged in the battery cell 1.

[0102] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the 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 inside the housing 10. The insulating member 30 is coated on the outer side of the housing 10. Among them, the outer surface of the first wall 11 includes a covered area 112 covered by the insulating member 30 and an exposed area 111 not covered by the insulating member 30, and the roughness of the exposed area 111 is greater than that of the covered area 112.

[0103] In some embodiments, the shape of the housing 10 may include but is not limited to a cylinder, a cuboid, or 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.

[0104] In some embodiments, the housing 10 has a first wall 11, and the first wall 11 can be one or at least one of the end cap 13, the side wall 122, or the bottom wall 121.

[0105] In some embodiments, the first wall 11 can be the end cap 13.

[0106] In some embodiments, the electrode assembly 20 is accommodated within 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.

[0107] 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 adhesion, snap connection, welding, etc.

[0108] In some embodiments, the outer surface of the housing 10 is coated with the 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.

[0109] In some embodiments, the outer surface of the first wall 11 includes a covering area 112 and an exposed area 111. The covering area 112 is connected to the insulating member 30, and the connection method may be adhesion.

[0110] In some embodiments, the exposed area 111 may be one or multiple.

[0111] In some embodiments, two exposed areas 111 may be provided on the same wall, and the two exposed areas 111 are spaced apart to increase the connection strength between the first wall 11 and the connecting member 130.

[0112] In some embodiments, the exposed area 111 may be rectangular.

[0113] In some embodiments, the exposed area 111 may also be triangular, pentagonal, circular, oval, etc.

[0114] In some embodiments, the exposed area 111 is used to connect to the connecting member 130, and the connection method between the exposed area 111 and the connecting member 130 may be adhesion.

[0115] In some embodiments, before processing, the roughness of the outer surface of the first wall 11 may be the same as that of the covering area 112. After processing, the roughness of a part of the outer surface of the first wall 11 is increased, and this part with increased roughness is the exposed area 111.

[0116] In some embodiments, the form of the increased roughness of the exposed area 111 may be that there are grooves 1111, protrusions 1112, etc. provided in the exposed area 111.

[0117] In some embodiments, the processing method of the exposed area 111 may be processes such as embossing, laser etching, laser engraving, etc.

[0118] 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 or heat conduction between the battery cell 1 and the box body 110 is achieved. The adhesive layer 120 is disposed in the exposed area 111. By increasing the roughness of the exposed area 111, the friction force 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 enabling a good heat conduction effect between the box body 110 and the battery cell 1, and improving the reliability of the battery device 100.

[0119] In some embodiments, the roughness Ra of the exposed area 111 is greater than or equal to 0.4 um and less than or equal to 100 um.

[0120] In some embodiments, the roughness Ra of the exposed area 111 satisfies the condition: 0.4 um ≤ Ra ≤ 100 um. For example, the roughness Ra of the exposed area 111 can be a specific value among 0.4 um, 10 um, 20 um, 30 um, 40 um, 50 um, 60 um, 70 um, 80 um, 90 um, 100 um or a value between any two of them.

[0121] In some embodiments, the roughness of each area in the exposed area 111 can be the same or different.

[0122] In some embodiments, the number of the exposed areas 111 can be multiple, and the roughness of each of the multiple exposed areas 111 can be the same or different.

[0123] In some embodiments, the roughness of the exposed area 111 can be detected by methods such as the stylus method, the impression method, the direct measurement method, the comparison measurement method, and the comprehensive measurement method. Taking the direct measurement method as an example, relevant parameters of the exposed area 111 can be directly measured by optical and electric instruments to determine the roughness.

[0124] In the technical solution of the embodiment of the present application, when the roughness of the exposed area 111 meets the above conditions, while improving the bonding reliability between the adhesive layer 120 and the exposed area 111, it also has good convenience when cleaning the exposed area 111.

[0125] In some embodiments, the roughness Ra of the exposed area 111 is greater than or equal to 0.8 um and less than or equal to 50 um.

[0126] In some embodiments, the roughness Ra of the exposed area 111 satisfies the condition: 0.8um ≤ Ra ≤ 50um. For example, the roughness Ra of the exposed area 111 can be a specific value among 0.8um, 10um, 10um, 20um, 30um, 40um, 50um or a value between any two of them.

[0127] In the technical solution of the embodiment of the present application, the roughness of the exposed area 111 satisfies the above conditions, which further improves the bonding reliability between the bonding layer 120 and the exposed area 111 while making it more convenient to clean the exposed area 111.

[0128] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a battery cell provided in some other embodiments of the present application. In some embodiments, the exposed area 111 is provided with a groove 1111 and / or a protrusion 1112.

[0129] In some embodiments, the exposed area 111 may be provided with a groove 1111. The processing method of the groove 1111 can be machining.

[0130] In some embodiments, the exposed area 111 may be provided with a protrusion 1112. The processing method of the protrusion 1112 can be extrusion.

[0131] In some embodiments, the exposed area 111 may be provided with both a groove 1111 and a protrusion 1112.

[0132] In some embodiments, when the bonding layer 120 is provided on the exposed area 111, the bonding layer 120 will bond to the wall surface of the groove 1111, thereby increasing the contact area between the bonding layer 120 and the exposed area 111.

[0133] In some embodiments, when the bonding layer 120 is provided on the exposed area 111, the bonding layer 120 will bond to the wall surface of the protrusion 1112, thereby increasing the contact area between the bonding layer 120 and the exposed area 111.

[0134] In the technical solution of the embodiment of the present application, by providing a groove 1111 and / or a protrusion 1112 on the exposed area 111, the roughness of the exposed area 111 is increased, thereby increasing the frictional force between the exposed area 111 and the bonding layer 120, reducing the risk of the bonding layer 120 falling off from the exposed area 111, and improving the reliability of the battery device 100.

[0135] Please refer to Figure 6 , Figure 6 which is a cross-sectional view of the first wall provided in some embodiments of the present application. In some embodiments, in the thickness direction X of the first wall, the depth D1 of the groove 1111 is greater than or equal to 0.02mm and less than or equal to 0.2mm.

[0136] In some embodiments, the thickness direction X of the first wall may be represented by the direction indicated by the letter X in the figure.

[0137] In some embodiments, the depth D1 of the groove 1111 may satisfy the condition: 0.02 mm ≤ D1 ≤ 0.2 mm. For example, D1 may be a specific value among 0.02 mm, 0.04 mm, 0.06 mm, 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 any two of them.

[0138] In some embodiments, the number of the grooves 1111 may be multiple. The depths D1 of the multiple grooves 1111 may all be the same, partially the same, or all different.

[0139] It should be noted that in the thickness direction X of the first wall, the depth D1 of the groove 1111 is less than the thickness of the first wall 11.

[0140] In the technical solution of the embodiment of the present application, the depth of the groove 1111 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.

[0141] Please refer to Figure 6 , in some embodiments, in the thickness direction X of the first wall, the depth D1 of the groove 1111 is greater than or equal to 0.02 mm and less than or equal to 0.1 mm.

[0142] In some embodiments, the depth D1 of the groove 1111 may satisfy the condition: 0.02 mm ≤ D1 ≤ 0.1 mm. For example, D1 may be a specific value among 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm or a value between any two of them.

[0143] In the technical solution of the embodiment of the present application, the depth of the groove 1111 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 first exposed area 111.

[0144] Please refer to Figure 5 , in some embodiments, the number of the grooves 1111 is multiple.

[0145] In some embodiments, the number of the grooves 1111 may be multiple. The openings of the multiple grooves 1111 may be circular, square or other shapes.

[0146] In some embodiments, the grooves 1111 can be arranged in different ways to form an embossed pattern. The embossed pattern can be the shape of a specific object, such as a flower, an animal, etc., or an irregular shape.

[0147] In some embodiments, in the thickness direction X of the first wall, the inner diameter of the groove 1111 can remain unchanged.

[0148] In some embodiments, in the thickness direction X of the first wall, the inner diameter of the groove 1111 can change, and the form of change can be a linear change or an irregular change.

[0149] The technical solution of the embodiment of the present application uses a plurality of grooves 1111 to connect with the adhesive layer 120, further improving the bonding reliability between the adhesive layer 120 and the exposed area 111, thereby improving the reliability of the battery device 100.

[0150] Please refer to Figure 4 , in some embodiments, 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. In the thickness direction X of the first wall, the first hollowed-out area 31 corresponds to the exposed area 111.

[0151] 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 the first wall 11 of the housing 10 has an area 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.

[0152] In some embodiments, the first hollowed-out area 31 provided on the insulating member 30 can be one or multiple.

[0153] 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 arranged at intervals 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.

[0154] 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.

[0155] In some embodiments, the first hollowed-out area 31 can also be triangular, pentagonal, circular, oval, etc.

[0156] In the technical solution of the embodiment of the present application, by providing a first hollowed-out area 31 in the area corresponding to the exposed area 111 of the insulating member 30, the risk of interference between the battery cell 1 and the insulating member 30 when the battery cell 1 is connected to the adhesive layer 120 is reduced, and the bonding reliability between the adhesive layer 120 and the exposed area 111 is improved, thereby improving the reliability of the battery device 100.

[0157] Please refer to Figure 4 and Figure 5 , in some embodiments, the housing 10 includes a housing body 12 and an end cap 13. The housing body 12 includes a bottom wall 121 and a plurality of side walls 122. The bottom wall 121 and the end cap 13 are disposed opposite to each other. The plurality of side walls 122 surround the bottom wall 121. One end of the plurality of side walls 122 is connected to the bottom wall 121, and the other end forms an opening. The end cap 13 closes the opening, and the end cap 13 is the first wall 11.

[0158] In some embodiments, the end cap 13 is the first wall 11.

[0159] In some embodiments, the bottom wall 121 and the side walls 122 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 a housing 10 for accommodating the electrode assembly 20.

[0160] In some embodiments, the bottom wall 121 and the side walls 122 may also be a split structure, that is, the side walls 122 are a hollow structure with openings at both ends in the thickness direction X of the first wall, and the first wall 11 and the bottom wall 121 respectively cover the two openings of the side walls 122.

[0161] In some embodiments, the bottom wall 121 and the side walls 122 are an integrally formed structure, that is, the bottom wall 121 and the side walls 122 of the housing 10 are made by an integral forming process, such as stamping or casting.

[0162] In the technical solution of the embodiment of the present application, the end cap 13 is the first wall 11, which increases the friction between the end cap 13 and the adhesive layer 120, reduces the risk of the adhesive layer 120 falling off from the end cap 13, improves the bonding reliability between the adhesive layer 120 and the end cap 13, and thereby improves the reliability of the battery device 100.

[0163] Please refer to Figure 4 , in some embodiments, 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 end cap 13, and the second insulating member 33 covers at least a part of the outer surface of the bottom wall 121 and at least a part of the outer surface of the side walls 122. The second insulating member 33 has a first flanging portion 331. The first flanging portion 331 is disposed along the circumferential direction of the end cap 13 and is located on the outer surface of the end cap 13. The first flanging portion 331 and the edge of the first insulating member 32 jointly enclose a first hollowed-out area 31.

[0164] In some embodiments, the first insulating member 32 covers the outer surface of the end cap 13 facing away from the electrode assembly 20, that is, the first insulating member 32 is disposed on the end cap 13 and is located on the side of the end cap 13 facing away from the interior of the battery cell 1.

[0165] In some embodiments, the second insulating member 33 covers the outer surface of the bottom wall 121 facing away from the electrode assembly 20 and the outer surface of the side wall 122 facing away from the electrode assembly 20, that is, the second insulating member 33 is disposed on the housing 12 formed by the enclosure of the bottom wall 121 and the side wall 122 and is located on the side of the housing 12 facing away from the interior of the battery cell 1.

[0166] In some embodiments, the second insulating member 33 has a first flanging portion 331. The first flanging portion 331 is disposed along the circumferential direction of the end cap 13 and is located on the side of the end cap 13 facing away from the electrode assembly 20, that is, a part of the second insulating member 33 disposed on the outer side of the housing 12 formed by the enclosure of the bottom wall 121 and the side wall 122 is folded onto the end cap 13, so that the second insulating member 33 forms the first flanging portion 331 on the outer surface of the end cap 13, and the first flanging portion 331 is an annular structure extending along the circumferential direction of the end cap 13.

[0167] In some embodiments, the first flanging portion 331 and the edge of the first insulating member 32 jointly enclose a first hollow-out area 31, that is, the first hollow-out area 31 is jointly enclosed by the annular first flanging portion 331 and the edge of the first insulating member 32 disposed on the outer surface of the end cap 13. That is to say, the inner edge of the first flanging portion 331 and the outer edge of the first insulating member 32 jointly define the first hollow-out area 31.

[0168] The forming method of the first hollow-out area 31 is not limited to this. For example, the forming method of the first hollow-out area 31 can also be the following method.

[0169] In some embodiments, the first insulating member 32 can cover the entire surface of the end cap 13, and the first hollow-out area 31 can be disposed on the first insulating member 32.

[0170] In some embodiments, the first insulating member 32 can cover a part of the surface of the end cap 13, and the first hollow-out area 31 can be disposed on the first insulating member 32.

[0171] In some embodiments, the first insulating member 32 can cover a part of the surface of the end cap 13, the second insulating member 33 can also cover a part of the surface of the end cap 13, the first insulating member 32 and the second insulating member 33 do not contact each other, and the first hollow-out area 31 can be disposed on the first insulating member 32.

[0172] In the technical solution of the embodiment of the present application, by setting the insulator as the first insulating member 32 and the second insulating member 33 which are separately arranged, 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 122 and the bottom wall 121, which is beneficial to reducing the assembly difficulty between the insulating member 30 and the housing 10. At the same time, the second insulating member 33 has a first flanging portion 331 which is arranged along the circumference of the end cover 13 and is located at the edge of the end cover 13, so that the edge of the first insulating member 32 arranged on the end cover 13 and a part of the first flanging portion 331 jointly enclose to form a first hollow area 31, so as to form an exposed area 111 on the end cover 13. For the battery cell 1 with this structure, on the one hand, it is not necessary to set the first insulating member 32 as a structure with through holes, which is beneficial to improving the overall structural strength of the first insulating member 32, and on the other hand, it is beneficial to control the size and dimension of the first hollow area 31.

[0173] Please refer to Figure 7 , Figure 7 FIG. is a schematic structural diagram of a battery cell provided by some other embodiments of the present application. In some embodiments, the housing 10 includes a housing body 12 and an end cover 13. The housing body 12 includes a bottom wall 121 and a plurality of side walls 122. The bottom wall 121 and the end cover 13 are oppositely arranged. The plurality of side walls 122 surround the bottom wall 121. One ends of the plurality of side walls 122 are connected to the bottom wall 121, and the other ends form an opening. The end cover 13 closes the opening, and the bottom wall 121 is the first wall 11.

[0174] In some embodiments, the bottom wall 121 is the first wall 11.

[0175] In some embodiments, the first wall 11 and the side wall 122 enclose a hollow structure with one end open in the thickness direction X of the first wall, and the end cover 13 is covered at the opening to form a housing 10 for accommodating the electrode assembly 20.

[0176] In some embodiments, the first wall 11 and the side wall 122 may also be a split structure, that is, the side wall 122 is a hollow structure with both ends open in the thickness direction X of the first wall, and the first wall 11 and the end cover 13 are respectively covered at the two openings of the side wall 122.

[0177] In some embodiments, the first wall 11 and the side wall 122 are an integrally formed structure, that is, the first wall 11 and the side wall 122 of the housing 10 are made by an integral forming process, such as stamping or casting.

[0178] In the technical solution of the embodiment of the present application, the bottom wall 121 is the first wall 11, which increases the friction between the bottom wall 121 and the adhesive layer 120, reduces the risk of the adhesive layer 120 falling off from the bottom wall 121, improves the bonding reliability between the adhesive layer 120 and the bottom wall 121, and thus improves the reliability of the battery device 100.

[0179] Please refer to Figure 7 In some embodiments, the insulating member 30 includes a first insulating member 32 and a second insulating member 33, which are separately provided. The first insulating member 32 covers a portion of the outer surface of the end cap 13, and the second insulating member 33 covers at least a portion of the outer surface of the bottom wall 121 and at least a portion of the outer surface of the side wall 122. The second insulating member 33 has a second flange portion 332, which is arranged along the circumference of the bottom wall 121 and located on the outer surface of the bottom wall 121. The second flange portion 332 encloses the first hollow area 31.

[0180] In some embodiments, the second insulating member 33 has a second flange portion 332, which is arranged along the circumference of the bottom wall 121 and is located on the side of the bottom wall 121 facing away from the electrode assembly 20, that is, the portion of the second insulating member 33 arranged on the outside of the shell 12 formed by the bottom wall 121 and the side wall 122 is folded onto the bottom wall 121, so that the second insulating member 33 is formed with a second flange portion 332 located on the outer surface of the bottom wall 121, and the second flange portion 332 is an annular structure extending along the circumference of the bottom wall 121.

[0181] In some embodiments, the edges of the second flange portion 332 jointly enclose a first hollow area 31, that is, the first hollow area 31 is formed by the edges of the second flange portion 332 of the annular structure, that is, the inner edges of the second flange portion 332 jointly define the first hollow area 31.

[0182] The forming method of the first hollow area 31 is not limited thereto. For example, the forming method of the first hollow area 31 can also be the following method.

[0183] In some embodiments, the second insulating member 33 may cover the entire surface of the bottom wall 121 , and the first hollow area 31 may be disposed on the second insulating member 33 .

[0184] In some embodiments, the second insulating member 33 may cover a portion of the surface of the bottom wall 121 , and the first hollow area 31 may be disposed on the second insulating member 33 .

[0185] According to the technical solution of the embodiment of the present application, the second insulating member 33 has a second flange portion 332 arranged on the bottom wall 121 along the circumference of the bottom wall 121 and located at the edge of the bottom wall 121, so that the edge of the second insulating member 33 arranged on the bottom wall 121 encloses a first hollow area 31 to form an exposed area 111 on the bottom wall 121. The battery cell 1 adopting this structure does not need to set the second insulating member 33 to a structure with a through hole, which is beneficial to improving the overall structural strength of the second insulating member 33. On the other hand, it is beneficial to control the size and dimensions of the first hollow area 31.

[0186] Please refer to Figure 8 , Figure 8Schematic structural diagram of a battery cell provided for some embodiments of the present application. In some embodiments, the outer casing 10 includes a housing 12 and an end cap 13. The housing 12 includes a bottom wall 121 and a plurality of side walls 122. The bottom wall 121 and the end cap 13 are disposed opposite to each other. The plurality of side walls 122 surround the bottom wall 121. One end of each of the plurality of side walls 122 is connected to the bottom wall 121, and the other end forms an opening. The end cap 13 closes the opening. At least one of the plurality of side walls 122 is a first wall 11.

[0187] In some embodiments, at least one of the plurality of side walls 122 may be a first wall 11.

[0188] For example, taking the number of side walls 122 as four as an example. One of the four side walls 122 may be a first wall 11. Alternatively, two of the four side walls 122 may be first walls 11. Alternatively, three of the four side walls 122 may be first walls 11. Alternatively, all four side walls 122 may be first walls 11.

[0189] In some embodiments, the first wall 11 and the bottom wall 121 enclose a hollow structure with an opening at one end in the extending direction of the first wall 11, and the end cap 13 covers the opening to form the outer casing 10 for accommodating the electrode assembly 20.

[0190] In some embodiments, the first wall 11 and the bottom wall 121 may also be a split structure, that is, the first wall 11 is a hollow structure with openings at both ends in the extending direction of the first wall 11, and the bottom wall 121 and the end cap 13 respectively cover the two openings of the first wall 11.

[0191] In some embodiments, the first wall 11 and the bottom wall 121 are of an integrally formed structure, that is, the first wall 11 and the bottom wall 121 of the outer casing 10 are made by an integral forming process, such as stamping or casting, etc.

[0192] In the technical solution of the embodiments of the present application, the side wall 122 is the first wall 11, which increases the friction between the side wall 122 and the adhesive layer 120, reduces the risk of the adhesive layer 120 peeling off from the side wall 122, improves the bonding reliability between the adhesive layer 120 and the side wall 122, and thus improves the reliability of the battery device 100.

[0193] Please refer to Figure 8 , in some embodiments, 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 end cap 13, and the second insulating member 33 covers at least a part of the outer surface of the bottom wall 121 and at least a part of the outer surface of the side wall 122. The first hollow area 31 is provided on the second insulating member 33.

[0194] In some embodiments, the second insulating member 33 may cover the entire surface of the first wall 11, and the first hollowed-out area 31 is provided in the second insulating member 33.

[0195] In the technical solution of the embodiment of the present application, the second insulating member 33 is provided with the first hollowed-out area 31, so that it is more convenient to arrange the second insulating member 33 on the side wall 122, which is convenient for installation.

[0196] Please refer to Figure 4 , in some embodiments, the housing 10 includes a housing 12 and an end cap 13. The housing 12 includes a bottom wall 121 and a plurality of side walls 122. The bottom wall 121 and the end cap 13 are oppositely arranged. The plurality of side walls 122 surround the bottom wall 121. One end of the plurality of side walls 122 is connected to the bottom wall 121, and the other end forms an opening. The end cap 13 closes the opening. The battery cell 1 further includes an electrode terminal 40, and the electrode terminal 40 is arranged on the end cap 13. The insulating member 30 is provided with a second hollowed-out area 34, and the electrode terminal 40 passes through the second hollowed-out area 34.

[0197] In some embodiments, when the first hollowed-out area 31 is arranged on the end cap 13, the second hollowed-out area 34 and the first hollowed-out area 31 are arranged at intervals, that is, the electrode terminal 40 arranged on the end cap 13 is arranged at intervals from the first hollowed-out area 31, and a part of the insulating member 30 is located between the electrode terminal 40 and the first hollowed-out area 31.

[0198] In the technical solution of the embodiment of the present application, the electrode terminal 40 is arranged on the end cap 13, and the insulating member 30 is provided with a second hollowed-out area 34 through which the power supply terminal 40 passes at a position corresponding to the electrode terminal 40, reducing the risk of interference between the insulating member 30 and the electrode terminal 40.

[0199] Please refer to Figure 5 , in some embodiments, the surface of the electrode terminal 40 includes a first area 41 for connecting with the heat exchange component, and the roughness of the first area 41 is greater than the roughness of the covering area 112.

[0200] In some embodiments, the heat exchange component may be the inner wall of the box body 110.

[0201] In some embodiments, when a plurality of battery cells 1 are connected to form a battery module, the heat exchange component may be a side plate or an end plate of the battery module.

[0202] In some embodiments, before processing, the roughness of the surface of the electrode terminal 40 may be the same. After processing, the roughness of a part of the surface of the electrode terminal 40 is increased, and this part with increased roughness is the first area 41.

[0203] In some embodiments, the form of the increase in the roughness of the first area 41 may be that there are grooves 1111, protrusions 1112, etc. arranged in the first area 41.

[0204] In some embodiments, the first region 41 can be processed by processes such as embossing, laser etching, or laser engraving.

[0205] In some embodiments, the surface of the electrode terminal 40 is the surface of the portion of the electrode terminal 40 that is exposed from the housing 10.

[0206] The technical solution of the embodiment of the present application increases the roughness of the first region 41 of the electrode terminal 40 for connecting with the heat exchange component, increases the friction between the first region 41 and the adhesive layer 120, reduces the risk of the adhesive layer 120 peeling off from the first region 41, improves the bonding reliability between the adhesive layer 120 and the first region 41, thereby enabling a better heat conduction effect between the box body 110 and the electrode terminal 40, and improving the reliability of the battery device 100.

[0207] Please refer to Figure 5 , in some embodiments, the surface of the electrode terminal 40 includes a first region 41 for connecting with the heat exchange component and a second region 42 for connecting with the bus bar component, and the roughness of the first region 41 is greater than that of the second region 42.

[0208] In some embodiments, the bus bar component is used to connect with the electrode terminal 40 to electrically connect multiple battery cells 1. The connection method between the bus bar component and the electrode terminal 40 can be welding.

[0209] The technical solution of the embodiment of the present application reduces the risk of the adhesive layer 120 peeling off from the first region 41 by increasing the roughness of the first region 41, and improves the reliability of the battery device 100.

[0210] Please refer to Figure 9 and Figure 10 , Figure 9 is a schematic diagram of the internal structure of a battery device provided by some embodiments of the present application, Figure 10 is a schematic diagram of the connection between the exposed area and the connection component provided by some 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 a battery cell 1 as described in any of the above embodiments. The battery cell 1 is disposed in the box body 110. The adhesive layer 120 is disposed in the exposed area 111. Wherein, the box body 110 includes a connection component 130, and the exposed area 111 is bonded to the connection component 130 through the adhesive layer 120.

[0211] In some embodiments, the battery cell 1 is placed inside the box body 110, that is, the bottom wall 121 of the battery cell 1 is configured to support the electrode assembly 20, so that the bottom wall 121 can play a supporting role for the electrode assembly 20. That is to say, the end cover 13 of the outer shell 10 is arranged facing the top of the box body 110, the bottom wall 121 of the outer shell 10 is arranged facing the bottom of the box body 110, or during actual use, the end cover 13 of the outer shell 10 is oriented towards the ground or downward.

[0212] Wherein, the connecting component 130 is arranged between the first wall 11 and the inner wall of the box body 110 in the thickness direction X of the first wall, and the exposed area 111 formed by the connecting component 130 and the first wall 11 is bonded.

[0213] In some embodiments, when the end cover 13 is the first wall 11, the connecting component 130 can be a pressing strip. At this time, the connecting component 130 is made of an insulating material, and the material of the connecting component 130 can be rubber, plastic, silica gel, 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.

[0214] In some embodiments, the connecting component 130 can also be the inner wall of the box body 110.

[0215] In some embodiments, the connecting component 130 can also be a heat exchange component.

[0216] In some embodiments, the bonding layer 120 can be a glue layer.

[0217] In some embodiments, the bonding layer 120 can be a structural adhesive or a thermally conductive structural adhesive.

[0218] This application also provides an electrical device, including the battery cell 1 of any of the above embodiments or the battery device 100 of any of the above embodiments. The battery cell 1 or the battery device 100 is used to provide electrical energy for the electrical device.

[0219] Please refer to Figures 3 to 8 , in some embodiments, the battery cell 1 includes an outer shell 10 and an insulating member 30. The outer shell 10 has a first wall 11. The insulating member 30 is coated on the outside of the outer shell 10. The outer surface of the first wall 11 includes a covered area 112 covered by the insulating member 30 and an exposed area 111 not covered by the insulating member 30. The roughness of the exposed area 111 is greater than the roughness of the covered area 112.

[0220] The housing 10 includes a housing body 12 and an end cover 13. The housing body 12 includes a bottom wall 121 and a plurality of side walls 122. The bottom wall 121 and the end cover 13 are disposed opposite to each other. The plurality of side walls 122 surround the bottom wall 121. One end of each of the plurality of side walls 122 is connected to the bottom wall 121, and the other end forms an opening, and the end cover 13 closes the opening. At least one of the end cover 13, the bottom wall 121 and the plurality of side walls 122 is the first wall 11.

[0221] In the technical solution of the embodiment of the present application, by increasing the roughness of the exposed area 111 on the first wall 11, the friction force 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 connecting the battery cell 1 to the box body 110, and enabling a good heat conduction effect between the box body 110 and the battery cell 1, and improving the reliability of the battery device 100.

[0222] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof 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 manner. 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, include: a housing having a first wall; an electrode assembly housed in the housing; an insulating member, covering the outer side of the shell; The outer surface of the first wall includes a covered area covered by the insulating member and an exposed area not covered by the insulating member, and the roughness of the exposed area is greater than that of the covered area.

2. The battery cell according to claim 1, characterized in that, The roughness Ra of the exposed area is greater than or equal to 0.4 um and less than or equal to 100 um.

3. The battery cell according to claim 2, wherein The roughness Ra of the exposed area is greater than or equal to 0.8 um and less than or equal to 50 um.

4. The battery cell according to claim 1, characterized in that, The exposed area is provided with grooves and / or protrusions.

5. The battery cell according to claim 4, wherein, In the thickness direction of the first wall, a depth D1 of the groove is greater than or equal to 0.02 mm and less than or equal to 0.2 mm.

6. The battery cell according to claim 5, characterized in that, In the thickness direction of the first wall, a depth D1 of the groove is greater than or equal to 0.02 mm and less than or equal to 0.1 mm.

7. The battery cell according to claim 4, characterized in that, There are multiple grooves.

8. The battery cell according to claim 1, wherein, The insulating member is provided with a first hollow area, which is located on a side of the first wall away from the electrode assembly. In the thickness direction of the first wall, the first hollow area corresponds to the exposed area.

9. The battery cell according to claim 8, wherein, The outer shell includes a shell and an end cover, the shell includes a bottom wall and multiple side walls, the bottom wall and the end cover are arranged opposite to each other, the multiple side walls are arranged around the bottom wall, one end of the multiple 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.

10. The battery cell according to claim 9, characterized in that, The insulating member includes a first insulating member and a second insulating member that are separately provided, the first insulating member covers a portion of the outer surface of the end cover, and the second insulating member covers at least a portion of the outer surface of the bottom wall and at least a portion of the outer surface of the side wall; The second insulating member has a first flange portion, which is arranged along the circumference of the end cover and located on the outer surface of the end cover. The first flange portion and the edge of the first insulating member are together enclosed to form the first hollow area.

11. The battery cell according to claim 8, wherein, The outer shell includes a shell and an end cover, the shell includes a bottom wall and multiple side walls, the bottom wall and the end cover are arranged opposite to each other, the multiple side walls are arranged around the bottom wall, one end of the multiple side walls is connected to the bottom wall, and the other end forms an opening, the end cover closes the opening, and the bottom wall is the first wall.

12. The battery cell according to claim 11, wherein, The insulating member includes a first insulating member and a second insulating member that are separately provided, the first insulating member covers a portion of the outer surface of the end cover, and the second insulating member covers at least a portion of the outer surface of the bottom wall and at least a portion of the outer surface of the side wall; The second insulating member has a second flange portion, which is arranged along the circumference of the bottom wall and located on the outer surface of the bottom wall. The second flange portion encloses and forms the first hollow area.

13. The battery cell according to claim 8, wherein, The outer shell includes a shell and an end cover, the shell includes a bottom wall and multiple side walls, the bottom wall and the end cover are arranged opposite to each other, the multiple side walls are arranged around the bottom wall, one end of the multiple side walls is connected to the bottom wall, and the other end forms an opening, the end cover closes the opening, and at least one of the multiple side walls is the first wall.

14. The battery cell according to claim 13, wherein, The insulating member includes a first insulating member and a second insulating member that are separately provided. The first insulating member covers a partial outer surface of the end cap, and the second insulating member covers at least a partial outer surface of the bottom wall and at least a partial outer surface of the side wall; The first hollowed-out area is provided in the second insulating member.

15. The battery cell according to claim 1, characterized in that, The housing includes a housing body and an end cap. The housing body includes a bottom wall and a plurality of side walls. The bottom wall and the end cap are oppositely arranged. The plurality of side walls surround the bottom wall. One ends of the plurality of side walls are connected to the bottom wall, and the other ends form an opening. The end cap closes the opening; The battery cell further includes an electrode terminal, and the electrode terminal is provided on the end cap; The insulating member is provided with a second hollowed-out area, and the electrode terminal passes through the second hollowed-out area.

16. The battery cell according to claim 15, characterized in that, The surface of the electrode terminal includes a first area for connecting with a heat exchange component, and the roughness of the first area is greater than that of the covering area.

17. The battery cell according to claim 15, wherein, The surface of the electrode terminal includes a first area for connecting with a heat exchange component and a second area for connecting with a busbar component, and the roughness of the first area is greater than that of the second area.

18. A battery device, characterized in that, Comprising: A box body; A plurality of battery cells as described in any one of claims 1-17, provided in the box body; An adhesive layer, provided 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.

19. An electrical device, characterized in that, Comprising the battery cell as described in any one of claims 1-17 or the battery device as described in claim 18, and the battery cell or the battery device is used to supply electric energy to the electrical device.

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