Battery monomer, battery device and electric device

Abstract

A battery cell (1), a battery device (100), and an electric device. The battery cell (1) includes a housing (10), an electrode assembly (20), and an insulator (30). The housing (10) has a first wall (11). The electrode assembly (20) is housed within the housing (10). The insulating member (30) covers the outer side of the housing (10) and covers the outer surface of the first wall (11). Wherein the insulating part (30) is provided with a first hollow area (31), the first hollow area (31) is located on the side, away from the electrode assembly (20), of the first wall (11), an exposed area (111) is formed in the position, corresponding to the first hollow area (31), of the outer surface of the first wall (11), the exposed area (111) is provided with a groove (1111) and / or a protrusion (1112), and the reliability of the battery can be improved.

Description

Battery cells, battery packs and electrical devices Technical Field

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

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

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

[0004] Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery device.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, this application provides a battery cell. The battery cell includes a casing, an electrode assembly, and an insulating member. The casing has a first wall. The electrode assembly is housed within the casing. The insulating member covers the outer side of the casing and covers the outer surface of the first wall. The insulating member has a first hollow area located on the side of the first wall opposite to the electrode assembly, and the outer surface of the first wall forms an exposed area corresponding to the first hollow area, the exposed area having grooves and / or protrusions.

[0008] In the technical solution of this application embodiment, the battery cell is connected to the housing through an adhesive layer to form a battery device. By setting grooves and / or protrusions in the exposed area, the friction between the exposed area and the adhesive layer is increased, the risk of the adhesive layer falling off from the exposed area is reduced, and the bonding reliability between the adhesive layer and the exposed area is improved, thereby improving the reliability of the battery cell connection to the housing and the reliability of the battery device.

[0009] In some embodiments, the groove includes a first groove, and the exposed area includes a plurality of first grooves, the plurality of first grooves forming an adhesive area.

[0010] The technical solution of this application embodiment provides a plurality of first grooves for connection with the adhesive layer, which further improves the bonding reliability between the adhesive layer and the exposed area, thereby improving the reliability of the battery cell connection to the housing and the reliability of the battery device.

[0011] In some embodiments, 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.

[0012] The technical solution of this application embodiment has an opening diameter of the first groove that meets the above conditions, which is easy to process and improves the bonding reliability between the adhesive layer and the exposed area.

[0013] 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.

[0014] The technical solution of this application embodiment has an opening diameter of the first groove that meets the above conditions, which is easy to process and further improves the bonding reliability between the adhesive layer and the exposed area.

[0015] 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.

[0016] In the technical solution of this application embodiment, the opening side length of the first groove meets the above conditions, which is easy to process and improves the bonding reliability between the adhesive layer and the exposed area.

[0017] 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.

[0018] In the technical solution of this application embodiment, the opening side length of the first groove meets the above conditions, which is easy to process and further improves the bonding reliability between the adhesive layer and the exposed area.

[0019] In some embodiments, in the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

[0020] In the technical solution of this application embodiment, the depth of the first groove meets the above conditions, reducing the impact on the strength of the first wall structure, while improving the bonding reliability between the adhesive layer and the exposed area.

[0021] In some embodiments, in the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

[0022] In the technical solution of this application embodiment, the depth of the first groove meets the above conditions, further reducing the impact on the strength of the first wall structure, while improving the bonding reliability between the adhesive layer and the exposed area.

[0023] In some embodiments, the groove includes a second groove, which includes a first groove segment and a second groove segment. The first groove segment and the second groove segment are arranged along the thickness direction of the first wall, and the first groove segment is closer to the outer surface of the first wall than the second groove segment. The diameter of the first groove segment is smaller than the diameter of the second groove segment.

[0024] In the technical solution of this application embodiment, the adhesive layer enters the second groove from the first groove segment. The diameter of the first groove segment of the second groove is smaller than the diameter of the second groove segment, which reduces the risk of the adhesive layer falling off from the second groove segment and improves the bonding reliability between the adhesive layer and the exposed area.

[0025] In some embodiments, the second groove includes a third groove segment, and the third groove segment, the first groove segment, and the second groove segment are arranged sequentially along the thickness direction of the first wall. One end of the third groove segment extends to the outer surface of the first wall, and the other end communicates with the first groove segment. The diameter of the first groove segment is smaller than the diameter of the third groove segment.

[0026] In the technical solution of this application embodiment, the adhesive layer sequentially passes through the third groove segment and the first groove segment into the second groove segment. The diameter of the first groove segment of the second groove is smaller than the diameter of the second groove segment, and the diameter of the first groove segment of the second groove is smaller than the diameter of the third groove segment. This reduces the risk of the adhesive layer falling off from the second groove segment. The adhesive layer is bonded through the third groove segment, increasing the bonding area and improving the bonding reliability between the adhesive layer and the exposed area.

[0027] In some embodiments, the diameter R2 of the first groove segment is greater than or equal to 1 mm and less than or equal to 3 mm.

[0028] The technical solution of this application embodiment has a diameter of the first groove segment that meets the above conditions. This makes it easy to process while reducing the risk of the adhesive layer falling off from the second groove segment and improving the bonding reliability between the adhesive layer and the exposed area.

[0029] In some embodiments, the diameter R3 of the second groove segment is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0030] The technical solution of this application embodiment has a diameter of the second groove that meets the above conditions. This makes it easy to process while reducing the risk of the adhesive layer falling off from the second groove and improving the bonding reliability between the adhesive layer and the exposed area.

[0031] In some embodiments, the diameter R4 of the third groove segment is greater than or equal to 2 mm and less than or equal to 4 mm.

[0032] In the technical solution of this application embodiment, the diameter of the third groove section meets the above conditions, which increases the bonding area 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.

[0033] In some embodiments, in the thickness direction of the first wall, the depth D2 of the second groove is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0034] In the technical solution of this application embodiment, 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 first wall, and improving the bonding reliability between the adhesive layer and the exposed area.

[0035] In some embodiments, in the thickness direction of the first wall, the depth D3 of the first groove segment is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

[0036] In the technical solution of this application embodiment, the depth of the first groove section meets the above conditions, which makes it 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.

[0037] In some embodiments, in the thickness direction of the first wall, the depth D4 of the second groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0038] The technical solution of this application embodiment has a second groove segment whose depth meets the above conditions. This makes it easy to process while reducing the risk of the adhesive layer falling off from the second groove segment and improving the bonding reliability between the adhesive layer and the exposed area.

[0039] In some embodiments, in the thickness direction of the first wall, the depth D5 of the third groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0040] In the technical solution of this application embodiment, the depth of the third groove section meets the above conditions, which makes it 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.

[0041] In some embodiments, the housing further includes a second wall and a sidewall, wherein the second wall is disposed opposite to the first wall along the thickness direction of the first wall, and the sidewall surrounds the first wall and the second wall. The insulating member includes a first insulating member and a second insulating member disposed separately, wherein the first insulating member covers a portion of the outer surface of the first wall, and the second insulating member covers at least a portion of the outer surface of the second wall and at least a portion of the outer surface of the sidewall.

[0042] The technical solution of this application embodiment sets the insulator as a first insulating member and a second insulating member that are separately set. The first insulating member is a structure that covers the first wall, and the second insulating member is a structure that covers the side wall and the second wall. This makes the first insulating member and the second insulating member of the insulating member correspond to the first wall of the outer shell and the second wall and the side wall of the outer shell, respectively, thereby helping to reduce the assembly difficulty between the insulating member and the outer shell.

[0043] In some embodiments, the second insulating member has a flange portion, which is disposed circumferentially along the first wall and located on the outer surface of the first wall. The flange portion and the edge of the first insulating member together enclose a first hollow area.

[0044] In the technical solution of this application embodiment, the second insulating member has a flange portion disposed circumferentially on the first wall and located at the edge of the first wall, such that the edge of the first insulating member disposed on the first wall and the flange portion together enclose a first hollow area to form an exposed area on the first wall. The battery cell with this structure does not require the first insulating member to be configured as a structure with through holes, which is beneficial to improving the overall structural strength of the first insulating member. On the other hand, it is beneficial to control the size and dimensions of the first hollow area.

[0045] In some embodiments, the battery cell further includes electrode terminals disposed on the first wall. The insulating member has a second hollow area, which is spaced apart from the first hollow area, and the electrode terminals pass through the second hollow area.

[0046] In the technical solution of this application embodiment, the electrode terminal is disposed on the first wall, and the insulating member is provided with a second hollow area through which the power supply terminal passes at the position corresponding to the electrode terminal. By setting the second hollow area and the first hollow area apart, the exposed area formed by the first wall corresponding to the first hollow area can be set apart from the electrode terminal, so as to reduce the interference between the exposed area and the electrode terminal when it is connected to the external component.

[0047] In some embodiments, the housing includes a shell and an end cap. The shell includes a bottom wall and a plurality of side walls. The bottom wall and the end cap are disposed opposite each other along the thickness direction of the first wall. The plurality of side walls surround the bottom wall. One end of the plurality of side walls is connected to the bottom wall, and the other end forms an opening. The end cap closes the opening and is the first wall.

[0048] In the technical solution of this application embodiment, the end cap is a first wall, which increases the friction between the end cap and the adhesive layer, reduces the risk of the adhesive layer falling off the end cap, improves the bonding reliability between the adhesive layer and the end cap, thereby improving the reliability of the end cap connecting to the housing and improving the reliability of the battery device.

[0049] Secondly, this application also provides a battery device. The battery device includes a housing, an adhesive layer, a connecting member, and battery cells according to any embodiment of the first aspect. The battery cells are disposed within the housing. The adhesive layer is disposed in the exposed area. The connecting member is disposed within the housing, and at least one side of the connecting member is connected to the adhesive layer in the thickness direction of the first wall to connect multiple battery cells.

[0050] In the technical solution of this application embodiment, the adhesive layer is disposed in the exposed area, thereby connecting the battery cell and the connecting component, improving the reliability of the battery cell connection to the housing, and improving the reliability of the battery device.

[0051] In some embodiments, the exposed area is provided with a groove, and at least a portion of the adhesive layer is located in the groove.

[0052] In the technical solution of this application embodiment, the adhesive layer is disposed in the groove, which reduces the risk of the adhesive layer falling off from the exposed area, improves the reliability of the battery cell connection to the housing, and improves the reliability of the battery device.

[0053] In some embodiments, the exposed area is provided with a protrusion that is fully embedded in the adhesive layer.

[0054] The technical solution of this application embodiment has a protrusion embedded in the adhesive layer, which reduces the risk of the adhesive layer falling off from the exposed area, improves the reliability of the battery cell connection to the housing, and improves the reliability of the battery device.

[0055] In some embodiments, the battery device further includes a connecting layer that connects the exposed area and the adhesive layer in the thickness direction of the first wall, and the connecting layer is made of a coupling agent.

[0056] In the technical solution of this application embodiment, the coupling agent has the properties of affinity for adhesive layer and affinity for metal. The outer shell of the battery cell is metal, and the connecting layer is the coupling agent. The connecting layer connects the adhesive layer and the exposed area, reducing the risk of the adhesive layer falling off from the exposed area, improving the reliability of the battery cell connection to the housing, and improving the reliability of the battery device.

[0057] Thirdly, this application also provides an electrical device, including a battery cell of any embodiment of the first aspect or a battery device of any embodiment of the second aspect, wherein the battery cell or battery device is used to provide electrical energy to the electrical device.

[0058] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0061] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0062] Figure 3 is an exploded view of a single battery cell provided in some embodiments of this application;

[0063] Figure 4 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0064] Figure 5 is a cross-sectional view of the first wall provided in some embodiments of this application;

[0065] Figure 6 is a cross-sectional view of the first wall provided in some other embodiments of this application;

[0066] Figure 7 is a cross-sectional view of the first wall provided in some embodiments of this application;

[0067] Figure 8 is a schematic diagram of the exposed area provided in some embodiments of this application;

[0068] Figure 9 is a schematic diagram of the exposed area provided in some other embodiments of this application;

[0069] Figure 10 is a schematic diagram of the second groove provided in some embodiments of this application;

[0070] Figure 11 is a schematic diagram of the second groove provided in some other embodiments of this application;

[0071] Figure 12 is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0072] Figure 13 is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application;

[0073] Figure 14 is a schematic diagram of the connection between the exposed area and the connecting component provided in some embodiments of this application;

[0074] Figure 15 is a schematic diagram showing the connection between the exposed area and the connecting component provided in some other embodiments of this application;

[0075] Figure 16 is a schematic diagram of the connection between the exposed area and the connecting component provided in some embodiments of this application.

[0076] Icons: 1-Battery cell; 10-Casing; 11-First wall; 111-Exposed area; 1111-Groove; 1112-Protrusion; 1113-First groove; 11131-Bonding area; 1114-Second groove; 1115-First slot segment; 1116-Second slot segment; 1117-Third slot segment; 12-Second wall; 13-Side wall; 14-Casing; 141-Bottom wall; 15-End cap; 20-Electrode assembly; 30-Insulation 31-First hollow area; 32-First insulating component; 33-Second insulating component; 331-Flanged part; 34-Second hollow area; 40-Electrode terminal; 100-Battery device; 110-Box; 120-Adhesive layer; 130-Connecting component; 140-Connecting layer; 150-First sub-box; 160-Second sub-box; 1000-Vehicle; 1100-Controller; 1200-Motor; X-Thickness direction of the first wall. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0079] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0080] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0081] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0082] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0083] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0084] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0085] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0086] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0087] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0088] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0089] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0090] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0091] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0092] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0093] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0094] As an example, the battery cell can be a pouch cell.

[0095] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0096] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0097] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0098] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0100] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0101] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0102] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0103] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0104] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0105] 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 particular limitation. When the separator 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0106] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0107] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas for batteries continue to expand, the market demand is also constantly increasing.

[0108] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental and / or internal battery conditions change.

[0109] Currently, battery cell assemblies are housed in a housing by directly fixing multiple battery cells to the housing. The fixing methods include directly gluing the battery cells to the housing or gluing the battery cells to connecting components (such as pressure strips) and then connecting them to the housing through the connecting components.

[0110] 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 cells may detach from the battery cells, thereby affecting the reliability of the connection between the battery cells and the housing. There is a risk that the connection between the battery cells and the housing may fail, resulting in damage to the battery cells and affecting the reliability of the battery device.

[0111] Based on the above considerations, in order to solve the problem of poor reliability of the battery device caused by the adhesion layer detaching from the battery cell, resulting in the failure of the connection between the battery cell and the casing, this application provides a battery cell. The battery cell includes a shell and an insulating component. The shell has a first wall. The insulating component covers the outer side of the shell and covers the outer surface of the first wall. The insulating component is provided with a first hollow area, which is located on the side of the first wall opposite to the electrode assembly. The outer surface of the first wall forms an exposed area at the position corresponding to the first hollow area, and the exposed area is provided with grooves and / or protrusions.

[0112] By setting grooves and / or protrusions in the exposed area, the friction between the exposed area and the adhesive layer is increased, reducing the risk of the adhesive layer falling off from the exposed area, improving the bonding reliability between the adhesive layer and the exposed area, thereby improving the reliability of the battery cell connection to the housing and the reliability of the battery device.

[0113] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0114] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0115] Please refer to Figure 1, which is a schematic diagram of the vehicle structure provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0116] The vehicle 1000 may also 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, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0117] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0118] The battery device includes battery cell modules and a power management system. The battery management system is connected to the battery cell modules and is used to manage the charging and discharging of the battery cell modules.

[0119] Please refer to Figure 2, which is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 may further include a housing 110, within which a single battery cell 1 is housed. The housing 110 provides a space for housing the single battery cell 1, and the housing 110 may employ various structures. In some embodiments, the housing 110 may include a first sub-housing 150 and a second sub-housing 160, which overlap each other, and together define a space for housing the single battery cell 1. The first sub-box 150 can be a hollow structure with one end open, and the second sub-box 160 can be a plate-like structure. The second sub-box 160 covers the opening side of the first sub-box 150 so that the first sub-box 150 and the second sub-box 160 together define the accommodating space. Alternatively, the first sub-box 150 and the second sub-box 160 can both be hollow structures with one side open, and the opening side of the first sub-box 150 covers the opening side of the second sub-box 160.

[0120] In the battery device 100, there can be multiple battery cells 1, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 1 are connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 1 is housed within the housing 110. Alternatively, the battery device 100 can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 110. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 1.

[0121] 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 to these.

[0122] Please refer to Figure 3, which is an exploded view of a battery cell provided in some embodiments of this application. The battery cell 1 includes one or more electrode assemblies 20 and a housing 10. The housing 10 may include a shell 14, the plurality of walls of the shell 14 forming a cavity for accommodating the electrode assemblies 20. The shape of the shell 14 depends on the combined shape of the one or more electrode assemblies 20; for example, the shell 14 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 14 may have an opening so that one or more electrode assemblies 20 can be placed inside the shell 14. The shell 14 is filled with an electrolyte, such as an electrolyte solution.

[0123] The battery cell 1 may also include two electrode terminals 40, which can be disposed on the end cap 15. The end cap 15 is typically flat, and the two electrode terminals 40 are fixed to the flat surface of the end cap 15, respectively being the positive electrode terminal and the negative electrode terminal. In this battery cell 1, depending on actual usage requirements, the electrode assembly 20 may be single or multiple, and multiple independent electrode assemblies 20 may be disposed within the battery cell 1.

[0124] Please refer to Figure 4, which is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. This application provides 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 housed within the housing 10. The insulating member 30 covers the outer side of the housing 10 and covers the outer surface of the first wall 11. The insulating member 30 has a first hollow area 31 located on the side of the first wall 11 facing away from the electrode assembly 20. An exposed area 111 is formed on the outer surface of the first wall 11 at a position corresponding to the first hollow area 31. The exposed area 111 has a groove 1111 and / or a protrusion 1112.

[0125] In some embodiments, the shape of the housing 10 may include, but is not limited to, a cylinder, a cuboid, or a blade shape. The material of the housing 10 may include, but is not limited to, copper, iron, aluminum, steel, or aluminum alloy.

[0126] In some embodiments, the housing 10 has a first wall 11, which may be one or more of the end cap 15, side wall 13, or bottom wall 141.

[0127] In some embodiments, the first wall 11 may be an end cap 15.

[0128] In some embodiments, the electrode assembly 20 is housed within the housing 10, and the outer surface of the first wall 11 is the surface of the first wall 11 that faces away from the electrode assembly 20.

[0129] In some embodiments, the material of the insulating member 30 may include, but is not limited to, rubber, silicone, or other materials. The insulating member 30 may be attached to the outer surface of the first wall 11 by means of bonding, snap-fitting, welding, or other methods.

[0130] In some embodiments, the outer surface of the housing 10 is covered with an insulating member 30, which can insulate the housing 10 of the battery cell 1 from the external environment, thereby reducing the risk of short circuit in the battery cell 1 during use.

[0131] In some embodiments, the first wall 11 forms an exposed area 111 at the position corresponding to the first hollow area 31, that is, the insulating member 30 is provided with the first hollow area 31, so that the first wall 11 of the outer shell 10 has an area that is avoided by the first hollow area 31, thereby forming an exposed area 111 on the first wall 11 that is not covered by the insulating member 30.

[0132] In some embodiments, the first cutout area 31 disposed on the insulating member 30 may be one or more.

[0133] In some embodiments, the insulating member 30 may be provided with two first hollow areas 31, which are spaced apart to form two corresponding exposed areas 111 on the first wall 11, thereby increasing the connection strength between the first wall 11 and the connecting member 130.

[0134] In some embodiments, the first hollow area 31 can be rectangular, and correspondingly, the exposed area 111 formed on the first wall 11 is also rectangular.

[0135] In some embodiments, the first cutout area 31 may also be a triangle, pentagon, circle, or ellipse, etc.

[0136] In some embodiments, the exposed area 111 is used to connect with the connecting member 130, and the connection between the exposed area 111 and the connecting member 130 can be by adhesive bonding.

[0137] Please refer to Figure 5, which is a cross-sectional view of the first wall provided in some embodiments of this application. In some embodiments, the exposed area 111 may be provided with a groove 1111. The groove 1111 may be machined.

[0138] Please refer to Figure 6, which is a cross-sectional view of the first wall provided in some other embodiments of this application. In some embodiments, the exposed area 111 may be provided with protrusions 1112. The protrusions 1112 may be processed by extrusion.

[0139] Please refer to Figure 7, which is a cross-sectional view of the first wall provided in some embodiments of this application. In some embodiments, the exposed area 111 may be provided with both a groove 1111 and a protrusion 1112.

[0140] In some embodiments, when an adhesive layer 120 is provided in the exposed area 111, the adhesive layer 120 will adhere to the groove wall surface of the groove 1111, thereby increasing the contact area between the adhesive layer 120 and the exposed area 111.

[0141] In some embodiments, when an adhesive layer 120 is provided in the exposed area 111, the adhesive layer 120 will adhere to the wall surface of the protrusion 1112, thereby increasing the contact area between the adhesive layer 120 and the exposed area 111.

[0142] In the technical solution of this application embodiment, the battery cell 1 is connected to the housing 110 through the adhesive layer 120 to form the battery device 100. By providing grooves 1111 and / or protrusions 1112 in the exposed area 111, the friction between the exposed area 111 and the adhesive layer 120 is increased, the risk of the adhesive layer 120 falling off from the exposed area 111 is reduced, and 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 housing 110 and improving the reliability of the battery device 100.

[0143] Please refer to Figures 8 and 9. Figure 8 is a schematic diagram of an exposed area provided in some embodiments of this application, and Figure 9 is a schematic diagram of an exposed area provided in other embodiments of this application. In some embodiments, the groove 1111 includes a first groove 1113, the exposed area 111 includes a plurality of first grooves 1113, and the plurality of first grooves 1113 form an adhesive area 11131.

[0144] In some embodiments, the number of first grooves 1113 can be multiple, and the openings of the multiple first grooves 1113 can be circular, square, or other shapes.

[0145] In some embodiments, the shapes of the openings of the plurality of first grooves 1113 may be all the same, all different, or partially the same.

[0146] In some embodiments, the first grooves 1113 can be arranged in different ways to form an embossed pattern, which is the adhesive area 11131. The embossed pattern can be the shape of a specific object, such as flowers or animals, or it can be an irregular shape. It should be noted that an adhesive layer 120 is also provided on the exposed area 111 in areas other than the adhesive area 11131.

[0147] In some embodiments, the inner diameter of the first groove 1113 may remain unchanged in the thickness direction X of the first wall.

[0148] In some embodiments, the inner diameter of the first groove 1113 can change in the thickness direction X of the first wall. The change can be linear or irregular.

[0149] The technical solution of this application embodiment provides a plurality of first grooves 1113 for connection with the adhesive layer 120, which further improves the bonding reliability between the adhesive layer 120 and the exposed area 111, thereby improving the reliability of the battery cell 1 connecting to the housing 110 and improving the reliability of the battery device 100.

[0150] Referring to Figure 8, in some embodiments, the opening of the first groove 1113 is circular, and the diameter R1 of the opening is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0151] In some embodiments, the diameter R1 of the opening of the first groove 1113 can satisfy the condition: 0.4mm≤R1≤1.2mm. For example, R1 can be a specific value among 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, and 1.2mm, or a value between two of them.

[0152] In some embodiments, the opening diameter R1 of the plurality of first grooves 1113 may be all the same, partially the same, or all different.

[0153] In the technical solution of this application embodiment, the opening diameter of the first groove 1113 meets the above conditions, which is easy to process and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0154] Referring to Figure 8, in some embodiments, the diameter R1 of the opening is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0155] In some embodiments, the diameter R1 of the opening of the first groove 1113 can satisfy the condition: 0.4mm≤R1≤0.8mm. For example, R1 can be a specific value among 0.4mm, 0.5mm, 0.6mm, 0.7mm, and 0.8mm, or a value between two of them.

[0156] In the technical solution of this application embodiment, the opening diameter of the first groove 1113 meets the above conditions, which is easy to process and further improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0157] Referring to Figure 8, in some embodiments, the opening of the first groove 1113 is square, and the side length A1 of the opening is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0158] In some embodiments, the side length A1 of the opening of the first groove 1113 can satisfy the condition: 0.4mm≤A1≤1.2mm. For example, A1 can be a specific value among 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, and 1.2mm, or a value between two of them.

[0159] In some embodiments, the opening side length A1 of the plurality of first grooves 1113 may be all the same, partially the same, or all different.

[0160] In the technical solution of this application embodiment, the opening side length of the first groove 1113 meets the above conditions, which is easy to process and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0161] Referring 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.

[0162] In some embodiments, the side length A1 of the opening of the first groove 1113 can satisfy the condition: 0.4mm≤A1≤0.8mm. For example, A1 can be a specific value among 0.4mm, 0.5mm, 0.6mm, 0.7mm, and 0.8mm, or a value between two of them.

[0163] In the technical solution of this application embodiment, the opening side length of the first groove 1113 meets the above conditions, which is easy to process and further improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0164] Referring to Figure 5, in some embodiments, in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

[0165] In some embodiments, the thickness direction of the first wall can be represented by the direction indicated by the letter X in the figure.

[0166] In some embodiments, the end cap 15 and the bottom wall 141 may be disposed opposite each other along the thickness direction X of the first wall.

[0167] In some embodiments, the depth D1 of the first groove 1113 can satisfy the condition: 0.08mm≤D1≤0.5mm. For example, D1 can be a specific value among 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, and 0.5mm, or a value between two of them.

[0168] In some embodiments, the depth D1 of the plurality of first grooves 1113 may be all the same, partially the same, or all different.

[0169] It should be noted that, in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is less than the thickness of the first wall 11.

[0170] In the technical solution of this application embodiment, the depth of the first groove 1113 satisfies the above conditions, reducing the impact on the structural strength of the first wall 11, while improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0171] Referring to Figure 5, in some embodiments, in the thickness direction X of the first wall, the depth D1 of the first groove 1113 is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

[0172] In some embodiments, the depth D1 of the first groove 1113 can satisfy the condition: 0.08mm≤D1≤0.2mm. For example, D1 can be a specific value among 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, and 0.2mm, or a value between two of them.

[0173] In the technical solution of this application embodiment, the depth of the first groove 1113 satisfies the above conditions, further reducing the impact on the structural strength of the first wall 11, while improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0174] Please refer to Figure 10, which is a schematic diagram of a second groove provided in some embodiments of this application. In some embodiments, the groove 1111 includes a second groove 1114, and the second groove 1114 includes a first groove segment 1115 and a second groove segment 1116. The first groove segment 1115 and the second groove segment 1116 are arranged along the thickness direction X of the first wall, and the first groove segment 1115 is closer to the outer surface of the first wall 11 than the second groove segment 1116. The diameter of the first groove segment 1115 is smaller than the diameter of the second groove segment 1116.

[0175] In some embodiments, the second groove 1114 may be formed by injection molding.

[0176] In some embodiments, in the thickness direction X of the first wall, a first groove segment 1115 and a second groove segment 1116 are arranged sequentially, with the first groove segment 1115 connected to one end of the second groove segment 1116 away from the electrode assembly 20.

[0177] In some embodiments, the second groove 1114 may include only the first groove segment 1115 and the second groove segment 1116, with one end of the first groove segment 1115 away from the second groove segment 1116 extending to the outer surface of the first wall 11.

[0178] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 111, the adhesive layer 120 enters the first groove segment 1115 and the second groove segment 1116. Since the diameter of the first groove segment 1115 is smaller than the diameter of the second groove segment 1116, the adhesive layer 120 will contact or abut against the inner wall of the second groove segment 1116 away from the electrode assembly 20, thereby making it difficult for the adhesive layer 120 to fall off from the second groove segment 1116.

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

[0180] In some embodiments, the diameter of the first groove segment 1115 may vary in the thickness direction X of the first wall.

[0181] In some embodiments, the diameter of the second groove segment 1116 may remain unchanged in the thickness direction X of the first wall.

[0182] In some embodiments, the diameter of the first groove segment 1115 may be deformed in the thickness direction X of the first wall.

[0183] It should be noted that the diameter of the connection between the first groove segment 1115 and the second groove segment 1116 is smaller than the diameter of the connection between the second groove segment 1116 and the first groove segment 1115.

[0184] In the technical solution of this application embodiment, the adhesive layer 120 enters the second groove 1116 from the first groove 1115. The diameter of the first groove 1115 of the second groove 1114 is smaller than the diameter of the second groove 1116, which reduces the risk of the adhesive layer 120 falling off from the second groove 1116 and improves the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0185] Please refer to Figure 11, which is a schematic diagram of a second groove provided in some embodiments of this application. In some embodiments, the second groove 1114 includes a third groove segment 1117. The third groove segment 1117, the first groove segment 1115, and the second groove segment 1116 are arranged sequentially along the thickness direction X of the first wall. One end of the third groove segment 1117 extends to the outer surface of the first wall 11, and the other end communicates with the first groove segment 1115. The diameter of the first groove segment 1115 is smaller than the diameter of the third groove segment 1117.

[0186] In some embodiments, the second groove 1114 may further include a third groove segment 1117. Along the thickness direction X of the first wall, the third groove segment 1117, the first groove segment 1115, and the second groove segment 1116 are arranged sequentially. The first groove segment 1115 is connected to one end of the second groove segment 1116 away from the electrode assembly 20, and the third groove segment 1117 is connected to one end of the first groove segment 1115 away from the electrode assembly 20. The end of the third groove segment 1117 away from the first groove segment 1115 extends to the outer surface of the first wall 11.

[0187] In some embodiments, the number of second grooves 1114 can be multiple, wherein some of the second grooves 1114 may include a first groove segment 1115, a second groove segment 1116 and a third groove segment 1117, and other parts of the second grooves 1114 may only include the first groove segment 1115 and the second groove segment 1116.

[0188] In some embodiments, the number of second grooves 1114 can be multiple, and all second grooves 1114 can include a first groove segment 1115, a second groove segment 1116 and a third groove segment 1117.

[0189] In some embodiments, when the adhesive layer 120 is disposed in the exposed area 111, the adhesive layer 120 enters the third groove segment 1117, the first groove segment 1115 and the second groove segment 1116. Since the diameter of the third groove segment 1117 is larger than the diameter of the first groove segment 1115, the contact area between the adhesive layer 120 and the connecting member 130 is larger.

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

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

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

[0193] In some embodiments, the diameter of the third groove segment 1117 may vary in the thickness direction X of the first wall.

[0194] It should be noted that the diameter of the end of the third groove segment 1117 facing away from the electrode assembly 20 can be larger than the diameter of the end of the first groove segment 1115 facing away from the electrode assembly 20.

[0195] In the technical solution of this application embodiment, the adhesive layer 120 sequentially passes through the third groove segment 1117 and the first groove segment 1115 into the second groove segment 1116. The diameter of the first groove segment 1115 of the second groove 1114 is smaller than the diameter of the second groove segment 1116, and the diameter of the first groove segment 1115 of the second groove 1114 is smaller than the diameter of the third groove segment 1117. This reduces the risk of the adhesive layer 120 falling off from the second groove segment 1116. The adhesive layer 120 is bonded through the third groove segment 1117, increasing the bonding area and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0196] Referring to Figure 10, in some embodiments, the diameter R2 of the first groove segment 1115 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0197] In some embodiments, the diameter R2 of the first groove segment 1115 can satisfy the condition: 1mm≤R2≤3mm. For example, R2 can be a specific value among 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, or a value between two of them.

[0198] In some embodiments, the number of second grooves 1114 can be multiple, and the diameters R2 of the multiple first groove segments 1115 can all be the same, some can be the same, or all can be different.

[0199] In the technical solution of this application embodiment, the diameter of the first groove segment 1115 meets the above conditions, which makes it easy to process and reduces the risk of the adhesive layer 120 falling off from the second groove segment 1116, thereby improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0200] Referring to Figure 10, in some embodiments, the diameter R3 of the second groove segment 1116 is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0201] In some embodiments, the diameter R3 of the second groove segment 1116 can satisfy the condition: 1.5mm≤R3≤4mm. For example, R3 can be a specific value among 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm, or a value between two of them.

[0202] In some embodiments, the number of second grooves 1114 can be multiple, and the diameters R3 of the multiple second groove segments 1116 can be all the same, partially the same, or all different.

[0203] In the technical solution of this application embodiment, the diameter of the second groove segment 1116 meets the above conditions, which makes it easy to process and reduces the risk of the adhesive layer 120 falling off from the second groove segment 1116, thereby improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0204] Referring to Figure 11, in some embodiments, the diameter R4 of the third groove segment 1117 is greater than or equal to 2 mm and less than or equal to 4 mm.

[0205] In some embodiments, the diameter R4 of the third groove segment 1117 can satisfy the condition: 2mm≤R4≤4mm. For example, R4 can be a specific value among 2mm, 2.5mm, 3mm, 3.5mm, and 4mm, or a value between two of them.

[0206] In some embodiments, the number of second grooves 1114 can be multiple, and the diameters R4 of the multiple third groove segments 1117 can be all the same, partially the same, or all different.

[0207] In the technical solution of this application embodiment, the diameter of the third groove segment 1117 satisfies the above conditions, which increases the bonding area while reducing the risk of the adhesive layer 120 falling off from the exposed area 111 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0208] Referring to Figure 11, in some embodiments, in the thickness direction X of the first wall, the depth D2 of the second groove 1114 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

[0209] In some embodiments, the depth D2 of the second groove 1114 can satisfy the condition: 0.4mm≤D2≤1.5mm. For example, D2 can be a specific value among 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, and 1.5mm, or a value between two of them.

[0210] In some embodiments, the depth D2 of the plurality of second grooves 1114 may be all the same, partially the same, or all different.

[0211] It should be noted that, in the thickness direction X of the first wall, the depth D2 of the second groove 1114 is less than the thickness of the first wall 11.

[0212] In some embodiments, the number of second grooves 1114 can be multiple, and the depth D2 of the multiple second grooves 1114 can be all the same, partially the same, or all different.

[0213] In the technical solution of this application embodiment, the depth of the second groove 1114 satisfies the above conditions, reducing the risk of the exposed area 111 of the adhesive layer 120 falling off, while reducing the risk of affecting the structural strength of the first wall 11, and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0214] Referring to Figure 10, in some embodiments, in the thickness direction X of the first wall, the depth D3 of the first groove segment 1115 is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

[0215] In some embodiments, the depth D3 of the first groove segment 1115 can satisfy the condition: 0.2mm≤D3≤0.75mm. For example, D3 can be a specific value among 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, and 0.75mm, or a value between two of them.

[0216] In some embodiments, the number of second grooves 1114 can be multiple, and the depth D3 of the first groove segment 1115 of the multiple second grooves 1114 can be all the same, partially the same, or all different.

[0217] In the technical solution of this application embodiment, the depth of the first groove 1115 meets the above conditions, which makes it easy to process while reducing the risk of the adhesive layer 120 falling off from the second groove 1116 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0218] Referring to Figure 10, in some embodiments, in the thickness direction X of the first wall, the depth D4 of the second groove segment 1116 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0219] In some embodiments, the depth D4 of the second groove segment 1116 can satisfy the condition: 0.1mm≤D4≤0.4mm. For example, D4 ​​can be a specific value among 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, and 0.4mm, or a value between two of them.

[0220] In some embodiments, the number of second grooves 1114 can be multiple, and the depth D4 of the second groove segments 1116 of the multiple second grooves 1114 can be all the same, partially the same, or all different.

[0221] In the technical solution of this application embodiment, the depth of the second groove 1116 meets the above conditions, which makes it easy to process while reducing the risk of the adhesive layer 120 falling off from the second groove 1116 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0222] Referring to Figure 11, in some embodiments, in the thickness direction X of the first wall, the depth D5 of the third groove segment 1117 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0223] In some embodiments, the depth D5 of the third groove segment 1117 can satisfy the condition: 0.1mm≤D3≤0.4mm. For example, D5 can be a specific value among 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, and 0.4mm, or a value between two of them.

[0224] In some embodiments, the number of second grooves 1114 can be multiple, and the depth D5 of the third groove segment 1117 of the multiple second grooves 1114 can be all the same, partially the same, or all different.

[0225] In the technical solution of this application embodiment, the depth of the third groove 1117 meets the above conditions, which makes it easy to process and reduces the risk of the adhesive layer 120 falling off from the exposed area 111, thereby improving the bonding reliability between the adhesive layer 120 and the exposed area 111.

[0226] Please refer to Figures 3 and 4, and also to Figure 12, which is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application. In some embodiments, the housing 10 further includes a second wall 12 and a side wall 13. Along the thickness direction X of the first wall, the second wall 12 is disposed opposite to the first wall 11, and the side wall 13 surrounds the first wall 11 and the second wall 12. The insulating member 30 includes a separately disposed first insulating member 32 and a second insulating member 33. The first insulating member 32 covers a portion of the outer surface of the first wall 11, and the second insulating member 33 covers at least a portion of the outer surface of the second wall 12 and at least a portion of the outer surface of the side wall 13.

[0227] In some embodiments, along the thickness direction X of the first wall, the second wall 12 is disposed opposite to the first wall 11, and the side wall 13 is disposed around the first wall 11 and the second wall 12. That is, the first wall 11 and the second wall 12 are disposed at intervals along the thickness direction X of the first wall and are respectively disposed at both ends of the side wall 13. The side wall 13 is disposed around the first wall 11 along the circumference of the first wall 11 and around the second wall 12 along the circumference of the second wall 12.

[0228] It should be noted that the structure of the outer shell 10 can be various. It can be that the first wall 11, the second wall 12 and the side wall 13 are all separate structures, or the second wall 12 and the side wall 13 are integrally formed structures with the first wall 11 connected to the end of the side wall 13 away from the first wall 11, or the first wall 11 and the side wall 13 are integrally formed structures with the second wall 12 connected to the end of the side wall 13 away from the second wall 12.

[0229] In some embodiments, the first insulating member 32 covers the outer surface of the first wall 11 away from the electrode assembly 20, that is, the first insulating member 32 is disposed on the first wall 11 and located on the side of the first wall 11 away from the interior of the battery cell 1.

[0230] In some embodiments, the second insulating member 33 covers the outer surface of the second wall 12 away from the electrode assembly 20 and the outer surface of the side wall 13 away from the electrode assembly 20. That is, the second insulating member 33 is disposed on the housing 14 formed by the second wall 12 and the side wall 13, and is located on the side of the housing 14 away from the interior of the battery cell 1.

[0231] In some embodiments, the first insulating member 32 may cover the entire surface of the first wall 11, and the first hollow area 31 may be disposed on the first insulating member 32.

[0232] In some embodiments, the first insulating member 32 may cover a portion of the surface of the first wall 11, and the first hollow area 31 may be disposed on the first insulating member 32.

[0233] In some embodiments, the first insulating member 32 may cover a portion of the surface of the first wall 11, and the second insulating member 33 may also cover a portion of the surface of the first wall 11. The first insulating member 32 and the second insulating member 33 do not contact each other, and the edge of the second insulating member 33 and the edge of the first insulating member 32 together define the first hollow area 31.

[0234] In some embodiments, the first insulating member 32 may cover a portion of the surface of the first wall 11, and the second insulating member 33 may also cover a portion of the surface of the first wall 11. The first insulating member 32 and the second insulating member 33 do not contact each other, and the first hollow area 31 may be disposed on the first insulating member 32.

[0235] The technical solution of this application embodiment sets the insulator as a first insulating member 32 and a second insulating member 33 that are separately set. The first insulating member 32 is a structure that covers the first wall 11, and the second insulating member 33 is a structure that covers the side wall 13 and the second wall 12. This makes the first insulating member 32 and the second insulating member 33 of the insulating member 30 correspond to the first wall 11 and the second wall 12 and the side wall 13 of the outer shell 10, respectively, thereby helping to reduce the assembly difficulty between the insulating member 30 and the outer shell 10.

[0236] Referring to Figures 3, 4 and 12, in some embodiments, the second insulating member 33 has a flange 331, which is arranged circumferentially along the first wall 11 and located on the outer surface of the first wall 11. The flange 331 and the edge of the first insulating member 32 together enclose the first hollow area 31.

[0237] In some embodiments, the second insulating member 33 has a flange 331, which is disposed circumferentially along the first wall 11 and located on the side of the first wall 11 away from the electrode assembly 20. That is, a portion of the second insulating member 33 disposed on the outside of the housing 14 formed by the second wall 12 and the side wall 13 is folded onto the first wall 11 so that the second insulating member 33 forms a flange 331 on the outer surface of the first wall 11, and the flange 331 is an annular structure extending circumferentially along the first wall 11.

[0238] In some embodiments, the flange portion 331 and the edge of the first insulating member 32 together enclose and form a first hollow area 31, that is, the first hollow area 31 is formed by the flange portion 331 of the annular structure and the edge of the first insulating member 32 disposed on the outer surface of the first wall 11. In other words, the inner edge of the flange portion 331 and the outer edge of the first insulating member 32 together define the first hollow area 31.

[0239] In the technical solution of this application embodiment, the second insulating member 33 has a flanged portion 331 disposed circumferentially on the first wall 11 and located at the edge of the first wall 11, such that the edge of the first insulating member 32 disposed on the first wall 11 and a portion of the flanged portion 331 together enclose and form a first hollow area 31, thereby forming an exposed area 111 on the first wall 11. The battery cell 1 with this structure does not need 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. On the other hand, it is beneficial to control the size and dimensions of the first hollow area 31.

[0240] Referring to Figures 3, 4, and 12, in some embodiments, the battery cell 1 further includes an electrode terminal 40, which is disposed on the first wall 11. The insulating member 30 is provided with a second hollow area 34, which is spaced apart from the first hollow area 31, and the electrode terminal 40 passes through the second hollow area 34.

[0241] In some embodiments, the second cutout area 34 is spaced apart from the first cutout area 31, that is, the electrode terminal 40 disposed on the first wall 11 is spaced apart from the first cutout area 31, and a portion of the insulating member 30 is located between the electrode terminal 40 and the first cutout area 31.

[0242] In the technical solution of this application embodiment, the electrode terminal 40 is disposed on the first wall 11, and the insulating member 30 is provided with a second hollow area 34 through which the power supply terminal 40 passes at the position corresponding to the electrode terminal 40. By setting the second hollow area 34 and the first hollow area 31 alternately, the exposed area 111 formed by the first wall 11 corresponding to the first hollow area 31 can be set alternately with the electrode terminal 40, so as to reduce the interference between the exposed area 111 and the electrode terminal 40 when it is connected to the external component.

[0243] Referring to Figure 3, in some embodiments, the outer casing 10 includes a housing 14 and an end cap 15. The housing 14 includes a bottom wall 141 and a plurality of side walls 13. The bottom wall 141 and the end cap 15 are disposed opposite each other along the thickness direction X of the first wall. The plurality of side walls 13 surround the bottom wall 141. One end of the plurality of side walls 13 is connected to the bottom wall 141, and the other end forms an opening. The end cap 15 closes the opening and is the first wall 11.

[0244] In some embodiments, the second wall 12 and the side wall 13 enclose a hollow structure with one end open 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.

[0245] In some embodiments, the second wall 12 and the side wall 13 may also be a split structure, that is, the side wall 13 is a hollow structure with openings at both ends in the thickness direction X of the first wall, and the first wall 11 and the second wall 12 respectively cover the two openings of the side wall 13.

[0246] In some embodiments, the second wall 12 and the side wall 13 are integrally formed, that is, the second wall 12 and the side wall 13 of the outer shell 10 are made by an integral forming process, such as stamping or casting.

[0247] In the technical solution of this application embodiment, the end cap 15 is a first wall 11, which increases the friction between the end cap 15 and the adhesive layer 120, reduces the risk of the adhesive layer 120 falling off the end cap 15, improves the bonding reliability between the adhesive layer 120 and the end cap 15, thereby improving the reliability of the end cap 15 connecting to the housing 110 and improving the reliability of the battery device 100.

[0248] Please refer to Figures 13 to 15. Figure 13 is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application. Figure 14 is a schematic diagram of the connection between the exposed area and the connecting component provided in some embodiments of this application. Figure 15 is a schematic diagram of the connection between the exposed area and the connecting component provided in other embodiments of this application. In Figure 13, the first sub-box is hidden to facilitate the demonstration of the internal structure of the battery device. This application also provides a battery device 100. The battery device 100 includes a box 110, an adhesive layer 120, a connecting component 130, and a battery cell 1 from any of the above embodiments. The battery cell 1 is disposed within the box 110. The adhesive layer 120 is disposed in the exposed area 111. The connecting component 130 is disposed within the box 110. In the thickness direction X of the first wall, at least one side of the connecting component 130 is connected to the adhesive layer 120 to connect multiple battery cells 1.

[0249] In some embodiments, the battery cell 1 is placed inside the housing 110, that is, the second wall 12 of the battery cell 1 is configured to support the electrode assembly 20, such that the second wall 12 can support the electrode assembly 20 in the thickness direction X of the first wall. That is, the first wall 11 of the housing 10 is disposed facing the top of the housing 110, and the second wall 12 of the housing 10 is disposed facing the bottom of the housing 110, or in actual use, the second wall 12 of the housing 10 is disposed facing the ground or downward, such that the thickness direction X of the first wall is the vertical direction.

[0250] The connecting component 130 is disposed between the first wall 11 and the top of the housing 110 in the thickness direction X of the first wall, and the connecting component 130 is bonded to the exposed area 111 formed by the first wall 11.

[0251] In some embodiments, the connecting member 130 may be a pressure strip.

[0252] In some embodiments, the connecting component 130 is made of an insulating material, such as rubber, plastic, or silicone. The connecting component 130 with this structure can achieve an insulating connection between the connecting component 130 and the battery cell 1, thereby reducing the risk of leakage or short circuit.

[0253] It should be noted that in other embodiments, the battery cell 1 may also be placed upside down inside the housing 110, that is, the first wall 11 of the battery cell 1 is configured to support the electrode assembly 20, so that the first wall 11 can support the electrode assembly 20 in the thickness direction X of the first wall, so that the connecting member 130 is disposed between the first wall 11 and the bottom of the housing 110 in the thickness direction X of the first wall, and the exposed area 111 formed by the connecting member 130 and the first wall 11 is bonded.

[0254] In some embodiments, the adhesive layer 120 may be an adhesive layer.

[0255] In some embodiments, in the thickness direction X of the first wall, one surface of the adhesive layer 120 is bonded to the exposed area 111, and the other surface is bonded to the connecting member 130, such that the connecting member 130 connects a plurality of battery cells 1 to the side facing the battery cell 1.

[0256] In the technical solution of this application embodiment, the adhesive layer 120 is disposed in the exposed area 111, thereby connecting the battery cell 1 and the connecting component 130, improving the reliability of the battery cell 1 connecting to the housing 110, and improving the reliability of the battery device 100.

[0257] Referring to Figure 14, in some embodiments, the exposed area 111 is provided with a groove 1111, and at least a portion of the adhesive layer 120 is located in the groove 1111.

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

[0259] In some embodiments, a portion of the space in the groove 1111 of the exposed area 111 may be filled by the adhesive layer 120.

[0260] In the technical solution of this application embodiment, the adhesive layer 120 is disposed in the groove 1111, which reduces the risk of the adhesive layer 120 falling off from the exposed area 111, improves the reliability of the battery cell 1 connecting to the housing 110, and improves the reliability of the battery device 100.

[0261] Referring to Figure 15, in some embodiments, the exposed area 111 is provided with a protrusion 1112, which is completely embedded in the adhesive layer 120.

[0262] In some embodiments, the entire outer surface of the protrusion 1112 in the exposed area 111 is in contact with the adhesive layer 120.

[0263] In the technical solution of this application embodiment, the protrusion 1112 is embedded in the adhesive layer 120, which reduces the risk of the adhesive layer 120 falling off from the exposed area 111, improves the reliability of the battery cell 1 connecting to the housing 110, and improves the reliability of the battery device 100.

[0264] Please refer to Figure 16, which is a schematic diagram of the connection between the exposed area and the connecting component provided in some embodiments of this application. In some embodiments, the battery device 100 further includes a connecting layer 140, which connects the exposed area 111 and the adhesive layer 120 in the thickness direction X of the first wall. The material of the connecting layer 140 is a coupling agent.

[0265] In some embodiments, the outer casing 10 may be made of metal.

[0266] In some embodiments, the housing 10 may be made of aluminum.

[0267] In some embodiments, the adhesive layer 120 may be made of synthetic resin.

[0268] In some embodiments, the coupling agent has properties that are both adhesive-friendly and metal-friendly. The molecule of the coupling agent simultaneously contains reactive groups that can chemically bond with inorganic materials (such as glass, silica sand, metals, etc.) and reactive groups that can chemically bond with organic materials (such as synthetic resins).

[0269] In some embodiments, in the thickness direction X of the first wall, one surface of the connecting layer 140 may be connected to the exposed area 111, and the other surface may be connected to the adhesive layer 120.

[0270] In some embodiments, the connecting layer 140 may not have obvious delamination with the adhesive layer 120, that is, both the connecting layer 140 and the adhesive layer 120 may be in contact with the exposed area 111 and may be in contact with the connecting component 130.

[0271] In the technical solution of this application embodiment, the coupling agent has the properties of affinity for adhesive layer 120 and affinity for metal. The outer shell 10 of the battery cell 1 is metal, and the connecting layer 140 is a coupling agent. The connecting layer 140 connects the adhesive layer 120 and the exposed area 111, reducing the risk of the adhesive layer 120 falling off from the exposed area 111, improving the reliability of the battery cell 1 connected to the housing 110, and improving the reliability of the battery device 100.

[0272] This application also provides an electrical device, including a battery or a battery device 100 of any of the above embodiments, wherein the battery cell 1 or the battery device 100 is used to provide electrical energy to the electrical device.

[0273] Referring to Figures 3, 4, 5, 9, and 11, in some embodiments, the battery cell 1 includes an electrode assembly 20, a housing 10, and an insulating member 30. The electrode assembly 20 is disposed within the housing 10. The housing 10 includes a shell 14 and an end cap 15. The shell 14 has an opening, and the end cap 15 closes the opening of the shell 14. The insulating member 30 covers the outside of the housing 10 and covers the outer surface of the end cap 15. The insulating member 30 has a first hollow area 31 located on the side of the end cap 15 opposite to the electrode assembly 20. The outer surface of the end cap 15 forms an exposed area 111 at a position corresponding to the first hollow area 31, and the exposed area 111 has a groove 1111.

[0274] In some embodiments, the groove 1111 includes a first groove 1113 and a second groove 1114. There are multiple first grooves 1113, and the first grooves 1113 can be arranged in different ways to form an embossed pattern, the embossed pattern being the adhesive area 11131.

[0275] There are multiple second grooves 1114. Each second groove 1114 includes a first groove segment 1115, a second groove segment 1116, and a third groove segment 1117, which are sequentially connected along the thickness direction X of the first wall. One end of the third groove segment 1117 extends to the outer surface of the end cap 15. The diameter of the first groove segment 1115 is smaller than the diameter of the third groove segment 1117, and the diameter of the first groove segment 1115 is smaller than the diameter of the second groove segment 1116.

[0276] By providing a first groove 1113 and a second groove 1114 in the exposed area 111, the friction between the exposed area 111 and the adhesive layer 120 is increased, reducing the risk of the adhesive layer 120 falling off from the exposed area 111 and improving the bonding reliability between the adhesive layer 120 and the exposed area 111. This, in turn, improves the reliability of the battery cell 1 connecting to the housing 110 and the reliability of the battery device 100.

[0277] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This 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 by, The application relates to a battery, comprising: a shell having a first wall; an electrode assembly accommodated in the shell; an insulating member wrapped outside the shell and covering an outer surface of the first wall; wherein the insulating member is provided with a first hollow area located on a side of the first wall away from the electrode assembly, and the outer surface of the first wall forms a bare area at a position corresponding to the first hollow area, and the bare area is provided with grooves and / or protrusions.

2. The battery cell of claim 1, wherein, The grooves comprise first grooves, and the bare area comprises a plurality of the first grooves, and the plurality of the first grooves form a bonding area.

3. The battery cell of any one of claims 1 to 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 any one of claims 1 to 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 of any one of claims 1 to 2, wherein, The opening of the first groove is square, and the side length A1 of the opening of the first groove is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

6. The battery cell of claim 5, wherein, 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 any one of claims 1 to 6, characterized in that, In the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.5 mm.

8. The battery cell of any one of claims 1 to 7, wherein, In the thickness direction of the first wall, the depth D1 of the first groove is greater than or equal to 0.08 mm and less than or equal to 0.2 mm.

9. The battery cell of any one of claims 1 to 8, wherein, The grooves comprise second grooves, and the second grooves comprise a first groove segment and a second groove segment arranged in the thickness direction of the first wall, and the first groove segment is closer to the outer surface of the first wall than the second groove segment. The diameter of the first groove segment is smaller than the diameter of the second groove segment.

10. The battery cell of claim 9, wherein, The second grooves comprise a third groove segment, and the third groove segment, the first groove segment and the second groove segment are sequentially arranged in the thickness direction of the first wall, and one end of the third groove segment extends to the outer surface of the first wall, and the other end of the third groove segment communicates with the first groove segment. The diameter of the first groove segment is smaller than the diameter of the third groove segment.

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

12. The battery cell of any one of claims 9 to 11, wherein, The diameter R3 of the second groove segment is greater than or equal to 1.5 mm and less than or equal to 4 mm.

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

14. The battery cell of any one of claims 9 to 13, wherein, In the thickness direction of the first wall, the depth D2 of the second groove is greater than or equal to 0.4 mm and less than or equal to 1.5 mm.

15. The battery cell of any one of claims 9 to 14, wherein, In the thickness direction of the first wall, the depth D3 of the first groove segment is greater than or equal to 0.2 mm and less than or equal to 0.75 mm.

16. The battery cell of any one of claims 9 to 15, wherein, In the thickness direction of the first wall, the depth D4 of the second groove segment is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

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

18. The battery cell of any one of claims 1-17, wherein, The shell further comprises a second wall and a side wall, the second wall is arranged opposite to the first wall along the thickness direction of the first wall, and the side wall is arranged around the first wall and the second wall; The insulating member comprises a first insulating member and a second insulating member arranged separately, the first insulating member covers part of the outer surface of the first wall, and the second insulating member covers at least part of the outer surface of the second wall and at least part of the outer surface of the side wall.

19. The battery cell of claim 18, wherein, The second insulating member has a flange part, the flange part is arranged along the circumference of the first wall and located on the outer surface of the first wall, and the flange part and the edge of the first insulating member jointly form the first hollow area.

20. The battery cell of any one of claims 1-19, wherein, The battery monomer further comprises an electrode terminal, and the electrode terminal is arranged on the first wall. The insulating member is provided with a second hollow area, the second hollow area is arranged separately from the first hollow area, and the electrode terminal passes through the second hollow area.

21. The battery cell of any one of claims 1-20, wherein, The shell comprises a shell body and an end cover, the shell body comprises a bottom wall and a plurality of side walls, the bottom wall and the end cover are arranged opposite to each other along the thickness direction of the first wall, the plurality of side walls are arranged around the bottom wall, one end of the plurality of side walls is connected to the bottom wall, and the other end forms an opening, the end cover closes the opening, and the end cover is the first wall.

22. A battery device, characterized by Comprise: A box body; A plurality of battery monomers according to any one of claims 1 to 21 are arranged in the box body; An adhesive layer is arranged in the exposed area; A connecting component is arranged in the box body, at least one side of the connecting component is connected to the adhesive layer in the thickness direction of the first wall, so as to connect a plurality of battery monomers.

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

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

25. The battery device of any one of claims 22-24, wherein, The battery device further comprises a connecting layer, the connecting layer connects the exposed area and the adhesive layer in the thickness direction of the first wall, and the material of the connecting layer is a coupling agent.

26. An electrical device, comprising: The battery monomer or the battery device is used to provide electric energy for the electric device. The battery monomer or the battery device is used to provide electric energy for the electric device.

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