Battery cells, battery packs, and electrical devices

Abstract

This application provides a battery cell, a battery device, and an electrical device. The battery cell includes a housing, electrode terminals, an insulating member, an adapter plate, and an electrode assembly. The housing includes a first wall. The electrode terminals are disposed on the first wall. The insulating member is disposed within the housing. The insulating member is disposed on one side of the first wall. The adapter plate is disposed within the housing. The adapter plate is connected to the electrode terminals. The electrode assembly is disposed within the housing. The electrode assembly includes tabs. The adapter plate includes a connected body portion and a first protrusion. The body portion and the first protrusion are located on the side of the insulating member opposite to the first wall. A first gap is formed between the body portion and the housing along the width direction of the first wall. At least a portion of the first protrusion is disposed within the first gap. The tabs are connected to the body portion, and at least a portion of the tabs is disposed within the first gap.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular 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. Improving battery safety has always been a key research direction in battery technology development. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the safety of the battery device.

[0004] This application provides a battery cell, comprising a housing, electrode terminals, an insulating member, an adapter plate, and an electrode assembly. The housing includes a first wall. The electrode terminals are disposed on the first wall. The insulating member is disposed within the housing, on one side of the first wall. The adapter plate is disposed within the housing and connected to the electrode terminals. The electrode assembly is disposed within the housing, including tabs. The adapter plate includes a connected body portion and a first protrusion. The body portion and the first protrusion are located on the side of the insulating member opposite to the first wall. A first gap is formed between the body portion and the housing along the width direction of the first wall. At least a portion of the first protrusion is disposed within the first gap. The tabs are connected to the body portion, and at least a portion of the tabs is disposed within the first gap.

[0005] In the battery cell of this application embodiment, the adapter includes a body portion and a first protrusion. A first gap can be formed between the body portion and the casing in the width direction. A portion of the tab can reuse the first gap, which helps reduce the height of the battery cell and increase its energy density. The electrolyte can relatively easily pass through the first gap and contact the insulating component, making it relatively easy for the insulating component located in or near the first gap to swell and collapse. The first protrusion can support the insulating component over a larger width range. When the insulating component contacts the electrolyte and swells, the first protrusion can support it. The first protrusion can also prevent the insulating component from contacting the electrode assembly, reducing the possibility of a deformed insulating component inserting into the electrode assembly, reducing the possibility of a short circuit between the positive and negative electrodes leading to thermal runaway in the battery cell, and thus improving the safety of the battery cell. The adapter of this application embodiment can help the battery cell achieve high energy density while providing effective support for the insulating component.

[0006] In some possible implementations, the adapter includes an adapter portion connected to an electrode terminal, the adapter portion being located in the body portion, at least a portion of which is located on one side of the first protrusion along the width direction of the first wall.

[0007] The way in which the adapter is located on the main body and along the width direction, and at least part of the adapter is located on one side of the first protrusion, can shorten the lever arm between the force point on the first protrusion and the connecting area, which is beneficial to improving the deformation resistance of the first protrusion and enabling the first protrusion to bear a larger force.

[0008] In some feasible implementations, a second gap is formed between the first protrusion and the housing along the width direction of the first wall, and the size of the first gap is larger than the size of the second gap.

[0009] Compared to the edge of the body portion, the edge of the first protrusion is closer to the edge of the insulating member, which allows the first protrusion to support the insulating member over a wider range in the width direction, thereby improving the first protrusion's ability to support the insulating member.

[0010] In some feasible ways, the tab is connected to the surface of the body that faces away from the insulating element.

[0011] When the insulating component comes into contact with the electrolyte and swells, the body and the insulating component are less likely to apply compressive stress to the tab, which helps to reduce the possibility of the tab breaking due to compressive force.

[0012] In some feasible embodiments, first protrusions are provided on opposite sides of the body portion along the width direction of the first wall, and first gaps are formed between the opposite sides of the body portion and the shell.

[0013] The housing may contain an electrode assembly. The tabs of an electrode assembly can be reused for the first gap on either side of the body, which improves the flexibility of the tab arrangement of the electrode assembly.

[0014] The housing may contain multiple electrode assemblies. The tabs of different electrode assemblies can be reused to cover the first gap on both sides of the main body, thereby reducing the possibility of the tabs squeezing each other due to different electrode assemblies simultaneously reusing the same first gap.

[0015] The first protrusion extends beyond the edge of the body near the housing. Along the width direction, the first protrusions on both sides can be used to support the insulating component, which helps to improve the stability and reliability of the first protrusion supporting the insulating component.

[0016] In some possible implementations, the first protrusion includes a plurality of first teeth spaced apart along the length of the first wall.

[0017] Multiple first teeth can provide multi-point support for the insulating component. The arrangement of multiple first teeth in the first protrusion allows for a balance between its support performance for the insulating component and its own weight. By fulfilling its support function, the first protrusion can reduce its own weight, which is beneficial for reducing the weight of the adapter plate and increasing the energy density of the battery cell.

[0018] In some feasible embodiments, a first tooth groove is formed between two adjacent first teeth, and along the width direction of the first wall, the first protrusion extends beyond the body portion by a dimension of K1, and the depth of the first tooth groove is K2, wherein K2≤K1.

[0019] The size of the first tooth in the width direction is related to the depth of the first tooth groove. The condition of K2≤K1 gives the first tooth good structural stability. When the first tooth supports the insulating part, it reduces the possibility of excessive bending moment at the root of the first tooth, which could lead to stress concentration at the root.

[0020] In some feasible ways, a foolproof chamfer is provided at one corner of the first protrusion.

[0021] During the assembly of the adapter piece and the electrode terminal, the correctness of the adapter piece to be assembled can be determined by the anti-foolproof chamfer of the first protrusion. This reduces the possibility of using the wrong adapter piece to connect to the electrode terminal, which could lead to the scrapping of the adapter piece and the electrode terminal. It also helps to improve the efficiency of the assembly of the adapter piece and the electrode terminal.

[0022] In some possible implementations, the adapter includes a second protrusion connected to the body portion, the second protrusion being located on the side of the insulator facing away from the first wall, and at least a portion of the second protrusion being disposed within the first gap.

[0023] The first and second protrusions can be used to support the insulating components at different positions, and can increase the effective support area of ​​the adapter plate on the insulating components, which is beneficial to improving the support stability and reliability of the adapter plate on the insulating components.

[0024] In some possible implementations, the second protrusion includes a plurality of second teeth spaced apart along the length of the first wall.

[0025] Multiple second teeth can provide multi-point support for the insulation component. The arrangement of multiple second teeth in the second protrusion allows for a balance between its support performance for the insulation component and its own weight. By fulfilling its support function, the second protrusion can reduce its own weight, which is beneficial for reducing the weight of the adapter plate and increasing the energy density of the battery cell.

[0026] In some feasible embodiments, a second tooth groove is formed between two adjacent second teeth, and along the width direction of the first wall, the second protrusion extends beyond the body portion by a dimension of K3, and the depth of the second tooth groove is K4, wherein K4≤K3.

[0027] The size of the second tooth in the width direction is related to the depth of the second tooth groove. The arrangement of K4≤K3 gives the second tooth good structural stability. When the second tooth supports the insulating part, it reduces the possibility of excessive bending moment at the root of the second tooth, which could lead to stress concentration at the root.

[0028] In some possible implementations, the body includes two connecting arms, each connecting arm being connected to a second protrusion, and a first opening is formed between the two connecting arms along the width direction of the first wall.

[0029] The design of setting the first opening on the adapter piece allows the adapter piece to reduce its own weight while meeting the requirements for supporting the insulation components. This achieves a balance between supporting the insulation components and its own weight, which is beneficial for improving the energy density of the battery cell.

[0030] In some feasible implementations, the insulating element includes a liquid injection hole, which is provided corresponding to the first opening.

[0031] The battery cell is injected with electrolyte through the injection hole. The adapter plate avoids the injection hole through the first opening, so that the adapter plate is less likely to obstruct the electrolyte during the injection process, reducing the injection resistance of the electrolyte and facilitating the smooth completion of the electrolyte injection through the injection hole, thereby improving the injection efficiency.

[0032] In some feasible implementations, the orthographic projection of the second protrusion lies within the orthographic projection of the insulating member in the same projection plane perpendicular to the height direction of the battery cell.

[0033] Along the width direction, the second protrusion does not extend beyond the edge of the insulating member, reducing the possibility of positional interference between the second protrusion and the housing, and also reducing the possibility of electrical connection between the second protrusion and the first wall due to the second protrusion extending beyond the insulating member.

[0034] In some feasible embodiments, the insulating member includes two opposite ends along its length, with a first protrusion located on the side of the insulating member facing away from the first wall.

[0035] When the end of the insulating component swells upon contact with the electrolyte, it is more prone to deformation than the middle portion. A first protrusion located below the end of the insulating component can support it, reducing the likelihood of deformation during electrode assembly insertion.

[0036] In some feasible implementations, the orthographic projections of the first protrusion and the body portion are located within the orthographic projection of the insulating member in the same projection plane perpendicular to the height direction of the battery cell.

[0037] Along the width direction, neither the first protrusion nor the body portion extends beyond the edge of the insulating member, reducing the possibility of positional interference between the first protrusion and the body portion and the housing, and also reducing the possibility of electrical connection between at least one of the first protrusion and the body portion and the first wall due to at least one of the first protrusion and the body portion extending beyond the insulating member.

[0038] In some feasible implementations, the distance between the edge of the first protrusion and the edge of the insulating member along the width direction of the first wall is 1 mm to 5 mm.

[0039] When the distance L2 between the edge of the first protrusion and the edge of the insulating member is less than 1 mm, the distance between the first protrusion and the edge of the insulating member is too small, increasing the possibility of electrical connection between the first protrusion and the first wall. When the distance L2 between the edge of the first protrusion and the edge of the insulating member is greater than 5 mm, the distance between the first protrusion and the edge of the insulating member is too large, and there is a possibility that the first protrusion does not provide sufficient support strength for the insulating member. A distance L2 between the edge of the first protrusion and the edge of the insulating member of 1 mm to 5 mm helps to reduce the possibility of electrical connection between the first protrusion and the first wall, while the first protrusion provides good support strength for the insulating member.

[0040] In some feasible embodiments, a thinning recess is provided on the surface of the body facing away from the insulating member, and the tab is connected to the bottom wall of the thinning recess.

[0041] In the height direction, a portion of the tab can be located within the thinning recess. This reuse of the thinning recess in the tab improves the utilization of internal space within the battery cell, reduces the cell's height, and thus increases its energy density.

[0042] In some feasible implementations, a third gap is formed between the first protrusion and the body portion and the insulating element along the height direction of the battery cell.

[0043] Before the adapter plate is connected to the electrode terminal, the insulating component and the first wall are assembled first. When the adapter plate is connected to the electrode terminal, the first protrusion and the main body are not easy to contact with the insulating component and the problem of positional interference occurs. This reduces the possibility of difficulty in connecting the adapter plate to the electrode terminal or the possibility of a loose connection at the connection point due to positional interference, which is beneficial to improving the working efficiency of the connection between the adapter plate and the electrode terminal and the stability of the connection structure.

[0044] In some feasible implementations, the orthographic projection of the first protrusion and the orthographic projection of the tab are spaced apart on the same projection plane perpendicular to the height direction of the battery cell.

[0045] When the first protrusion supports the insulating component and deforms towards the main body, the first protrusion is less likely to squeeze the tab, reducing the possibility that the tab may be inserted backwards into the main body and cause a short circuit in the electrode due to the tab being squeezed.

[0046] This application provides a battery device that includes the aforementioned battery cell assembly.

[0047] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy. Attached Figure Description

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0050] Figure 2 This is a partially exploded structural diagram of a battery device provided in an embodiment of this application;

[0051] Figure 3 This is a schematic diagram of the structure of a battery cell assembly provided in one embodiment of the application;

[0052] Figure 4 This is a partially exploded structural diagram of a battery cell provided in an embodiment of this application;

[0053] Figure 5 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0054] Figure 6 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0055] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure along the MM direction;

[0056] Figure 8 yes Figure 7 Enlarged view of section V in the middle;

[0057] Figure 9 This is a schematic diagram of the structure of an adapter plate provided in one embodiment of this application;

[0058] Figure 10 yes Figure 6 A schematic cross-sectional view of the structure along the PP direction;

[0059] Figure 11 yes Figure 10 Enlarged diagram of point S in the middle;

[0060] Figure 12 This is a schematic diagram of the structure of an adapter plate provided in one embodiment of this application;

[0061] Figure 13 This is a schematic diagram of the structure of an adapter plate provided in another embodiment of this application;

[0062] Figure 14 This is a schematic diagram of the structure of an adapter plate provided in another embodiment of this application;

[0063] Figure 15 This is a schematic diagram of the structure of an adapter plate provided in another embodiment of this application;

[0064] Figure 16 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0065] Figure 17 This is a schematic diagram of the structure of an adapter plate provided in another embodiment of this application;

[0066] Figure 18 This is a schematic diagram of the structure of an adapter plate provided in another embodiment of this application;

[0067] Figure 19 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0068] Figure 20 This is a partial cross-sectional view of a battery cell provided in another embodiment of this application;

[0069] Figure 21 This is a partial cross-sectional view of a battery cell provided in an embodiment of this application;

[0070] Figure 22 This is a partial cross-sectional view of a battery cell provided in an embodiment of this application.

[0071] Explanation of reference numerals in the attached figures:

[0072] 1. Vehicle; 10. Battery assembly; 10a. Housing; 10b. First housing section; 10c. Second housing section; 11. Controller; 12. Motor; 20. Battery cell assembly; 30. Battery cell; 40. First wall; 41. Electrode terminal; 50. Housing; 60. Electrode assembly; 61. Tab; 62. Main body; 70. Insulator; 71. Injection hole; 80. Adapter piece; 801. First opening; 81. First protrusion; 811. First tooth; 812. First groove; 813. Anti-foolproof chamfer; 82. Main body; 821. Connecting arm; 822. Thinning recess; 83. Second protrusion; 831. Second tooth; 832. Second groove; 84. Adapter; 100. First gap; 200. Second gap; 300. Third gap; X, length direction; Y, width direction; Z, height direction. Detailed Implementation

[0073] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0074] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0075] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0076] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0080] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0081] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery cell assemblies, etc. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0082] A single battery cell consists of electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. A single battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0083] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collection section and a positive electrode tab connected to the current collection section. The positive current collection section is coated with the positive active material layer. The positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes the positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0084] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collection section and a negative electrode tab connected to the negative electrode current collection section. The negative electrode current collection section is coated with the negative electrode active material layer. The negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper. The negative electrode active material layer includes the negative electrode active material. The negative electrode active material can be carbon or silicon, etc.

[0085] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0086] A battery cell includes a casing and an insulating component. The casing includes a first wall. The insulating component is disposed inside the first wall. The insulating component isolates the electrode assembly from the first wall. During the use of the battery cell, there is a possibility that the electrolyte may come into contact with the insulating component. The insulating component in contact with the electrolyte may swell, causing local deformation of the insulating component towards the electrode assembly. The deformed insulating component may insert into the electrode assembly, causing a short circuit between the positive and negative electrode plates. When a short circuit occurs between the positive and negative electrode plates, there is a possibility of thermal runaway in the electrode assembly, affecting the safety of the battery cell and the battery device including the battery cell.

[0087] To mitigate the problem of thermal runaway in electrode assemblies caused by insulation deformation, the insulation can be supported to reduce the possibility of it swelling, deforming, and inserting into the electrode assembly.

[0088] Based on the above considerations, in order to alleviate the problem of thermal runaway of the electrode assembly caused by the deformation of the insulating component, the inventors, after in-depth research, designed a battery cell. In this battery cell, the battery cell includes an adapter plate. The adapter plate is connected to the electrode terminals. The adapter plate is connected to the electrode assembly. The adapter plate includes a body portion and a first protrusion. When the insulating component swells and deforms, the first protrusion can be used to support the insulating component, thereby preventing the insulating component from contacting the electrode assembly, reducing the possibility of the deformed insulating component inserting into the electrode assembly, and reducing the possibility of a short circuit between the positive and negative electrode plates leading to thermal runaway of the battery cell.

[0089] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0090] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0091] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0092] See Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0093] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0094] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery cell assembly or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes battery cell assemblies or battery packs. Multiple battery cells can be connected in series, in parallel, or in a mixed configuration. A mixed configuration refers to a combination of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into a battery pack.

[0095] See Figure 2 As shown, the battery device 10 includes a housing 10a and individual battery cells (not shown). The individual battery cells are housed within the housing 10a.

[0096] The housing 10a can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10a can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0097] The housing 10a is used to accommodate individual battery cells, and the housing 10a can have various structures. In some embodiments, the housing 10a may include a first housing portion 10b and a second housing portion 10c. The first housing portion 10b and the second housing portion 10c overlap each other. The first housing portion 10b and the second housing portion 10c together define a receiving space for accommodating the individual battery cells. The second housing portion 10c may be a hollow structure with one open end. In some embodiments, the first housing portion 10b is a plate-like structure. The first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. In some embodiments, both the first housing portion 10b and the second housing portion 10c may also be hollow structures with one open side. The open side of the first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. Of course, the first housing portion 10b and the second housing portion 10c can have various shapes, such as cylinders, cuboids, etc.

[0098] To improve the sealing performance after the first housing part 10b and the second housing part 10c are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 10b and the second housing part 10c.

[0099] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b may also be referred to as the upper housing cover, and the second housing portion 10c may also be referred to as the lower housing.

[0100] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 10a. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery cell assembly. The multiple battery cell assemblies can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10a.

[0101] In some embodiments, see Figure 3 As shown, there can be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20. Multiple battery cell assemblies 20 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed within the casing 10a.

[0102] Multiple battery cells 30 in the battery cell assembly 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery cell assembly 20.

[0103] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

[0104] Battery cell 30 refers to the smallest unit that makes up battery device 10. See also Figure 4 and Figure 5 As shown, the battery cell 30 includes a housing 50, an electrode assembly 60, and an adapter plate 80.

[0105] The housing 50 includes a first wall 40. Functional components such as electrode terminals 41 may be provided on the first wall 40. The electrode terminals 41 can be electrically connected to the electrode assembly 60 via an adapter plate 80 for outputting or inputting electrical energy from the battery cell 30.

[0106] In some embodiments, the first wall 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. In some embodiments, an insulating member 70 may also be provided on the inner side of the first wall 40. The insulating member 70 may be used to isolate the electrical connection components within the housing 50 from the first wall 40 to reduce the risk of short circuit. Exemplarily, the insulating member 70 may be made of plastic, rubber, etc.

[0107] The housing 50 forms a receiving space that can accommodate the electrode assembly 60, electrolyte (not shown in the figure), and other components. In some embodiments, the first wall 40 may be a separate component. The housing 50 includes a housing body and the first wall 40. An opening may be provided on the housing body, and the first wall 40 may be used to close the opening to form the internal environment of the battery cell 30. In some embodiments, the housing body and the first wall 40 may be an integrated structure.

[0108] In some embodiments, the housing 50 can be of various shapes and sizes, such as cuboid, hexagonal prism, etc. The shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. In some embodiments, the material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0109] Electrode assembly 60 is the component in the battery cell 30 where electrochemical reactions occur. The housing 50 may contain one or more electrode assemblies 60. Electrode assembly 60 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body 62 of the electrode assembly 60. The portions of the positive and negative electrode sheets without active material each constitute tabs 61. The positive and negative tabs 61 may be located together at one end of the main body 62 or at opposite ends of the main body 62. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 61 connect to the electrode terminals 41 to form a current loop.

[0110] See Figures 6 to 9 As shown in the embodiment of this application, a battery cell 30 includes a housing 50, electrode terminals 41, an insulating component 70, an adapter piece 80, and an electrode assembly 60.

[0111] The housing 50 includes a first wall 40. Electrode terminals 41 are disposed on the first wall 40. An insulating member 70 is disposed within the housing 50. The insulating member 70 is disposed on one side of the first wall 40. An adapter piece 80 is disposed within the housing 50. The adapter piece 80 is connected to the electrode terminals 41. An electrode assembly 60 is disposed within the housing 50. The electrode assembly 60 includes tabs 61.

[0112] The adapter plate 80 includes a connected body portion 82 and a first protrusion 81. The body portion 82 and the first protrusion 81 are located on the side of the insulating member 70 opposite to the first wall 40. A first gap 100 is formed between the body portion 82 and the housing 50 along the width direction Y of the first wall 40. At least a portion of the first protrusion 81 is disposed within the first gap 100. A tab 61 is connected to the body portion 82. At least a portion of the tab 61 is disposed within the first gap 100.

[0113] The adapter piece 80 of this embodiment has a relatively narrow body portion 82. A first gap 100 can be formed between at least one side of the relatively narrow body portion 82 and the housing 50 along the width direction Y. After the tab 61 is led out from the body portion 62, a portion of the tab 61 can reuse the first gap 100 to improve the utilization rate of the internal space of the battery cell 30, thereby reducing the height of the battery cell 30 and increasing its energy density. In some possible implementations, the body portion 82 can also be used to support the insulating member 70.

[0114] In the width direction Y of the first wall 40, a first protrusion 81 protrudes from the body portion 82. The area on the adapter piece 80 where the first protrusion 81 is provided has a relatively large width. In this embodiment, the width of the area on the adapter piece 80 where the first protrusion 81 is provided is D1, and the width of the body portion 82 is D2, where D1 is greater than D2. The width D2 of the body portion 82 refers to the dimension between the two edges of the body portion 82 along the width direction Y. Relative to the body portion 82, the first protrusion 81 can be used to support the insulating member 70 over a larger width range in the width direction Y of the first wall 40.

[0115] In some possible implementations, the first protrusion 81 and the body portion 82 are located on the side of the insulating member 70 facing away from the first wall 40.

[0116] In some feasible embodiments, the tab 61 is connected to the surface of the body 82 facing away from the insulating member 70. No tab 61 is provided between the body 82 and the insulating member 70. When the insulating member 70 comes into contact with the electrolyte and swells, the body 82 and the insulating member 70 are less likely to apply compressive stress to the tab 61, which helps reduce the possibility of the tab 61 breaking due to compressive stress.

[0117] In some feasible ways, a portion of the tab 61 protrudes toward the insulator 70 and enters into the first gap 100.

[0118] In the battery cell 30 of this application embodiment, the adapter 80 includes a body portion 82 and a first protrusion 81. A first gap 100 can be formed between the body portion 82 and the housing 50 in the width direction Y. A portion of the tab 61 can reuse the first gap 100, which helps to reduce the height of the battery cell 30 and increase its energy density. The electrolyte can relatively easily pass through the first gap 100 and contact the insulating member 70, making it relatively easy for the insulating member 70 located in or near the first gap 100 to swell and collapse. The first protrusion 81 can support the insulating member 70 over a wider range. When the insulating member 70 contacts the electrolyte and swells, the first protrusion 81 can support it. The first protrusion 81 can also prevent the insulating member 70 from contacting the electrode assembly 60, reducing the possibility of a deformed insulating member 70 inserting into the electrode assembly 60, reducing the possibility of a short circuit between the positive and negative electrodes leading to thermal runaway in the battery cell 30, and thus improving the safety of the battery cell 30. The adapter piece 80 in this embodiment can help the battery cell 30 achieve high energy density, while providing effective support for the insulating component 70.

[0119] See also some of the possible implementation methods. Figures 9 to 11 As shown, along the width direction Y of the first wall 40, a second gap 200 is formed between the first protrusion 81 and the housing 50, and the size of the first gap 100 is larger than the size of the second gap 200.

[0120] The dimension of the first gap 100 refers to the distance from the edge of the body portion 82 to the housing 50 along the width direction Y. The dimension of the second gap 200 refers to the distance from the edge of the first protrusion 81 to the housing 50 along the width direction Y.

[0121] Compared to the edge of the body portion 82, the edge of the first protrusion 81 is closer to the edge of the insulating member 70, so that in the width direction Y, the first protrusion 81 can be used to support the insulating member 70 over a wider range, which is beneficial to improving the support capacity of the first protrusion 81 for the insulating member 70.

[0122] In some feasible implementations, the orthographic projection of the first protrusion 81 and the orthographic projection of the tab 61 are spaced apart in the same projection plane perpendicular to the height direction Z of the battery cell 30. The first protrusion 81 is not connected to the tab 61. There is no overlap between the first protrusion 81 and the tab 61 along the height direction Z.

[0123] No tab 61 is provided below the first protrusion 81. When the first protrusion 81 supports the insulating member 70, and the first protrusion 81 deforms toward the main body 62, the first protrusion 81 is less likely to squeeze the tab 61, reducing the possibility that the tab 61 may be inserted backward into the main body 62 due to being squeezed and causing a short circuit in the electrode.

[0124] See also some of the possible implementation methods. Figures 9 to 11 As shown, along the width direction Y of the first wall 40, first protrusions 81 are respectively provided on opposite sides of the main body 82, and first gaps 100 are formed between the opposite sides of the main body 82 and the housing 50. The first protrusions 81 on both sides form second gaps 200 between the first protrusions 81 on both sides and the housing 50.

[0125] The housing 50 may contain an electrode assembly 60. The tabs 61 of the electrode assembly 60 can be reused for the first gap 100 on either side of the body portion 82, which is beneficial to improving the flexibility of the arrangement of the tabs 61 of the electrode assembly 60.

[0126] The housing 50 may contain multiple electrode assemblies 60. The tabs 61 of different electrode assemblies 60 can be reused on both sides of the first gap 100 of the main body 82 to reduce the possibility of the tabs 61 squeezing each other due to different electrode assemblies 60 simultaneously reusing the same first gap 100.

[0127] The first protrusion 81 extends beyond the edge of the body portion 82 near the housing 50. Along the width direction Y, the first protrusions 81 on both sides can be used to support the insulating member 70, which helps to improve the stability and reliability of the support of the first protrusion 81 to the insulating member 70.

[0128] See in some examples Figure 9 and Figure 12 As shown, the adapter plate 80 includes an adapter portion 84 that connects to the electrode terminal 41. The adapter portion 84 is located in the body portion 82. Along the width direction Y, at least a portion of the adapter portion 84 is located on one side of the first protrusion 81.

[0129] The adapter piece 80 is connected to the electrode terminal 41 via the adapter portion 84 to form a connection area. The electrode terminal 41 provides support for the adapter piece 80 through this connection area. When the insulating member 70 contacts the electrolyte and swells, and when the insulating member 70 applies a force to the first protrusion 81, the first protrusion 81 bears a bending moment, causing the first protrusion 81 to tend to bend relative to the connection area. The adapter portion 84 is located on the body portion 82 and along the width direction Y, with at least a portion of the adapter portion 84 located on one side of the first protrusion 81. This shortens the lever arm between the stress point on the first protrusion 81 and the connection area, which helps to improve the deformation resistance of the first protrusion 81, allowing the first protrusion 81 to withstand larger forces.

[0130] In some examples, the area on the adapter 84 for connection with the electrode terminal 41 can be a circular area.

[0131] See in some examples Figure 9 and Figure 12As shown, the adapter piece 80 includes two first protrusions 81. Along the width direction Y, the adapter portion 84 is provided with first protrusions 81 on opposite sides.

[0132] The width of the area on the adapter piece 80 where the two first protrusions 81 are provided is D1. Width D1 refers to the dimension between the edges of the two first protrusions 81 along the width direction Y.

[0133] For example, the adapter 84 is welded to the electrode terminal 41. For instance, the adapter 84 and the electrode terminal 41 can be welded using a laser welding process.

[0134] For example, see Figure 9 and Figure 12 As shown, the adapter portion 84 can be a convex structure protruding towards the electrode terminal 41. The top wall of the adapter portion 84 is connected to the electrode terminal 41. Exemplarily, the surface of the top wall of the adapter portion 84 facing away from the electrode terminal 41 can be embossed, which facilitates welding of the adapter portion 84 to the electrode terminal 41.

[0135] For example, see Figure 13 As shown, the adapter portion 84 can be a flat structure. The first protrusion 81 and the body portion 82 can both be flat structures. The adapter portion 84 does not protrude from the surface of the body portion 82 facing the electrode terminal 41. For example, the surface of the adapter portion 84 facing away from the electrode terminal 41 can be embossed, which facilitates welding of the adapter portion 84 to the electrode terminal 41.

[0136] For example, see Figure 14 As shown, the main body 82 has an inclined transition portion, such that there is a height difference between the regions on both sides of the inclined transition portion along the height direction Z of the battery cell 30.

[0137] See in some examples Figure 15 As shown, the first protrusion 81 includes a plurality of first teeth 811. The plurality of first teeth 811 are spaced apart along the length direction X of the first wall 40.

[0138] Multiple first teeth 811 each form a cantilever structure. Each of the multiple first teeth 811 can support the insulating member 70 at different positions. The multiple first teeth 811 can provide multi-point support for the insulating member 70. The arrangement of the first protrusion 81 including multiple first teeth 811 allows the first protrusion 81 to achieve a balance between its support performance for the insulating member 70 and its own weight. The first protrusion 81 can reduce its own weight while fulfilling its support function, which is beneficial for reducing the weight of the adapter piece 80 and increasing the energy density of the battery cell 30.

[0139] See in some examples Figure 15As shown, a first tooth groove 812 is formed between two adjacent first tooth portions 811. Along the width direction Y, the first protrusion 81 extends beyond the body portion 82 by a dimension of K1, and the depth of the first tooth groove 812 is K2, where K2≤K1.

[0140] The size of the first tooth 811 in the width direction Y is related to the depth of the first tooth groove 812. The arrangement of K2≤K1 gives the first tooth 811 good structural stability. When the first tooth 811 supports the insulating part 70, it reduces the possibility of excessive bending moment at the root of the first tooth 811, which may lead to stress concentration at the root.

[0141] In some examples, the width W1 of the first tooth 811 in the length direction X of the first wall 40 ranges from 1 mm to 5 mm. For example, the width W1 of the first tooth 811 in the length direction X is 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0142] When the width W1 of the first tooth 811 is less than 1 mm, the width W1 of the first tooth 811 is relatively small, and there is a possibility that the structural strength of the first tooth 811 is insufficient, resulting in insufficient support capacity. When the width W1 of the first tooth 811 is greater than 5 mm, the width W1 of the first tooth 811 is relatively large, and there is a possibility that the weight reduction of the first protrusion 81 is not significant.

[0143] See in some examples Figure 15 As shown, the opening width W2 of the first tooth groove 812 in the length direction X ranges from 1 mm to 5 mm. For example, the opening width W2 of the first tooth groove 812 in the length direction X is 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0144] When the opening width W2 of the first tooth groove 812 is greater than 5 mm, the opening width W2 of the first tooth groove 812 is relatively large, which may lead to a decrease in the structural strength of the first protrusion 81 and insufficient support capacity. When the opening width W2 of the first tooth groove 812 is less than 1 mm, the opening width W2 of the first tooth groove 812 is relatively small, which may lead to insufficient weight reduction of the first protrusion 81.

[0145] For example, in the length direction X, the opening width W2 of each first tooth groove 812 is the same. For example, in the length direction X, each first tooth groove 812 is equally spaced.

[0146] See in some examples Figure 15As shown, a foolproof chamfer 813 is provided at one corner of the first protrusion 81. During the assembly process of the adapter piece 80 and the electrode terminal 41, the foolproof chamfer 813 of the first protrusion 81 can be used to determine whether the adapter piece 80 to be assembled is correct, reducing the possibility of using an incorrect adapter piece 80 to connect to the electrode terminal 41, which would lead to the scrapping of the adapter piece 80 and the electrode terminal 41. At the same time, it also helps to improve the efficiency of the assembly work of the adapter piece 80 and the electrode terminal 41.

[0147] For example, the first protrusion 81 includes two corners. The two corners are spaced apart along the length direction X. A foolproof chamfer 813 is provided on either of the two corners.

[0148] See also some of the possible implementation methods. Figure 15 As shown, along the width direction Y, the main body 82 includes two connecting arms 821. The two connecting arms 821 are spaced apart along the width direction Y. A first opening 801 is formed between the two connecting arms 821.

[0149] The way the adapter piece 80 is provided with the first opening 801 is beneficial for the adapter piece 80 to reduce its own weight while meeting the support performance of the insulating component 70, so as to achieve a balance between the support performance of the insulating component 70 and its own weight, which is conducive to improving the energy density of the battery cell 30.

[0150] In embodiments where the body portion 82 includes a first opening 801, the width D2 of the body portion 82 along the width direction Y refers to the maximum width of the body portion 82.

[0151] For example, see Figure 16 As shown, the insulating component 70 includes an injection hole 71. The injection hole 71 is provided corresponding to the first opening 801. The battery cell 30 is injected with electrolyte through the injection hole 71. The adapter piece 80 avoids the injection hole 71 through the first opening 801, so that during the electrolyte injection process, the adapter piece 80 is less likely to obstruct the electrolyte, reducing the electrolyte injection resistance and facilitating the smooth completion of electrolyte injection through the injection hole 71, thereby improving the electrolyte injection efficiency.

[0152] See also some of the possible implementation methods. Figure 17 As shown, the adapter piece 80 includes a second protrusion 83. The body portion 82 is connected to the second protrusion 83. The second protrusion 83 is located on the side of the insulating member 70 facing away from the first wall 40. At least a portion of the second protrusion 83 is disposed within the first gap 100. Along the width direction Y, the second protrusion 83 protrudes from the body portion 82. Along the length direction X, the first protrusion 81 and the second protrusion 83 are spaced apart. The second protrusion 83 is used to support the insulating member 70.

[0153] The second protrusion 83 extends beyond the edge of the body portion 82 near the housing 50. The first protrusion 81 and the second protrusion 83 can be used to support the insulating member 70 at different positions, and can increase the effective support area of ​​the adapter piece 80 on the insulating member 70, which is beneficial to improving the support stability and reliability of the adapter piece 80 on the insulating member 70.

[0154] In some examples, the orthographic projection of the second protrusion 83 and the orthographic projection of the tab 61 can be spaced apart in the same projection plane perpendicular to the height direction Z of the battery cell 30. The second protrusion 83 is not connected to the tab 61.

[0155] See in some examples Figure 18 As shown, the second protrusion 83 includes a plurality of second teeth 831. The plurality of second teeth 831 are spaced apart along the length direction X of the first wall 40.

[0156] Multiple second teeth 831 each form a cantilever structure. Each of the multiple second teeth 831 can support the insulating member 70 at different positions. The multiple second teeth 831 can provide multi-point support for the insulating member 70. The way the second protrusion 83 includes multiple second teeth 831 allows the second protrusion 83 to achieve a balance between its support performance for the insulating member 70 and its own weight. The second protrusion 83 can reduce its own weight while fulfilling its support function, which is beneficial for reducing the weight of the adapter piece 80 and increasing the energy density of the battery cell 30.

[0157] See in some examples Figure 18 As shown, a second tooth groove 832 is formed between two adjacent second teeth 831. Along the width direction Y, the second protrusion 83 extends beyond the body portion 82 by a dimension of K3, and the depth of the second tooth groove 832 is K4, where K4≤K3.

[0158] The size of the second tooth 831 in the width direction Y is related to the depth of the second tooth groove 832. The arrangement of K4≤K3 gives the second tooth 831 good structural stability. When the second tooth 831 supports the insulating part 70, it reduces the possibility of excessive bending moment at the root of the second tooth 831, which may lead to stress concentration at the root.

[0159] See in some examples Figure 18 As shown, the width W3 of the second tooth 831 in the length direction X ranges from 1 mm to 5 mm. For example, the width W3 of the second tooth 831 in the length direction X can be 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0160] When the width W3 of the second tooth 831 is less than 1 mm, the width W3 of the second tooth 831 is relatively small, and there is a possibility that the structural strength of the second tooth 831 is insufficient, resulting in insufficient support capacity. When the width W3 of the second tooth 831 is greater than 5 mm, the width W3 of the second tooth 831 is relatively large, and there is a possibility that the weight reduction of the second protrusion 83 is not significant.

[0161] See in some examples Figure 18 As shown, the opening width W4 of the second tooth groove 832 in the length direction X ranges from 1 mm to 5 mm. For example, the opening width W4 of the second tooth groove 832 in the length direction X can be 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0162] When the opening width W4 of the second tooth groove 832 is greater than 5 mm, the opening width W4 of the second tooth groove 832 is relatively large, which may lead to a decrease in the structural strength of the second protrusion 83 and insufficient support capacity. When the opening width W4 of the second tooth groove 832 is less than 1 mm, the opening width W4 of the second tooth groove 832 is relatively small, which may lead to insufficient weight reduction of the second protrusion 83.

[0163] For example, in the length direction X, the opening width W4 of each of the second tooth grooves 832 is the same. For example, in the length direction X, the second tooth grooves 832 are equally spaced.

[0164] See in some examples Figure 18 As shown, there are two second protrusions 83. The two second protrusions 83 are spaced apart along the width direction Y. The body portion 82 includes two connecting arms 821. Each connecting arm 821 is connected to one second protrusion 83. A first opening 801 is formed between the two connecting arms 821 along the width direction Y.

[0165] The way the adapter piece 80 is provided with the first opening 801 is beneficial for the adapter piece 80 to reduce its own weight while meeting the support performance of the insulating component 70, so as to achieve a balance between the support performance of the insulating component 70 and its own weight, which is conducive to improving the energy density of the battery cell 30.

[0166] For example, see Figure 19 As shown, the insulating component 70 includes a liquid injection hole 71. The liquid injection hole 71 is provided corresponding to the first opening 801.

[0167] The battery cell 30 is injected with electrolyte through the injection hole 71. The adapter plate 80 avoids the injection hole 71 through the first opening 801, so that the adapter plate 80 is less likely to block the electrolyte during the injection process, reducing the electrolyte injection resistance and facilitating the smooth completion of the electrolyte injection through the injection hole 71, thereby improving the injection efficiency.

[0168] For example, the injection hole 71 is configured to correspond entirely to the first opening 801. Alternatively, a portion of the injection hole 71 may correspond to the first opening 801.

[0169] In some examples, the orthographic projection of the second protrusion 83 lies within the orthographic projection of the insulating member 70 in the same projection plane perpendicular to the height direction Z of the battery cell 30.

[0170] See Figure 19 As shown, along the width direction Y, the second protrusion 83 does not extend beyond the edge of the insulating member 70, reducing the possibility of positional interference between the second protrusion 83 and the housing 50, and also reducing the possibility of electrical connection between the second protrusion 83 and the first wall 40 due to the second protrusion 83 extending beyond the insulating member 70.

[0171] For example, along the width direction Y, the distance L1 between the edge of the second protrusion 83 and the edge of the insulating member 70 can be 1 mm to 5 mm.

[0172] When the distance L1 between the edge of the second protrusion 83 and the edge of the insulating member 70 is less than 1 mm, the distance between the two edges is too small, increasing the possibility of electrical connection between the second protrusion 83 and the first wall 40. When the distance L1 between the edge of the second protrusion 83 and the edge of the insulating member 70 is greater than 5 mm, the distance is too large, potentially leading to insufficient support of the second protrusion 83 for the insulating member 70. A distance L1 between the edge of the second protrusion 83 and the edge of the insulating member 70 of 1 mm to 5 mm helps reduce the possibility of electrical connection between the second protrusion 83 and the first wall 40, while also providing good support strength for the insulating member 70.

[0173] For example, along the width direction Y, the distance L1 between the orthographic projection edge of the second protrusion 83 and the orthographic projection edge of the insulating member 70 is 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0174] In some examples, the insulating member 70 is a strip-shaped insulating plate. Along the length direction X, a first protrusion 81 is disposed near the end of the insulating member 70, and a second protrusion 83 is disposed near the middle region of the insulating member 70.

[0175] See also some of the possible implementation methods. Figure 5 and Figure 19 As shown, the insulating member 70 includes two opposite ends along the length direction X. The first protrusion 81 is located on the side of the insulating member 70 facing away from the first wall 40.

[0176] When the end of the insulating member 70 swells upon contact with the electrolyte, it is relatively more prone to deformation than the middle portion of the insulating member 70. The first protrusion 81 located below the end of the insulating member 70 can support the end of the insulating member 70 to reduce the possibility of the end of the insulating member 70 deforming and being inserted into the electrode assembly 60.

[0177] In some examples, the insulating element 70 can be an insulating board.

[0178] See also some of the possible implementation methods. Figure 16 or Figure 19 As shown, in the same projection plane along the height direction Z of the battery cell 30, the orthographic projections of the first protrusion 81 and the body portion 82 are respectively located within the orthographic projection of the insulating member 70.

[0179] Along the width direction Y, neither the first protrusion 81 nor the body portion 82 extends beyond the edge of the insulating member 70, reducing the possibility of positional interference between the first protrusion 81 and the body portion 82 and the housing 50, and also reducing the possibility of electrical connection between at least one of the first protrusion 81 and the body portion 82 and the first wall 40 due to at least one of the first protrusion 81 and the body portion 82 extending beyond the insulating member 70.

[0180] In some examples, the distance L2 between the edge of the first protrusion 81 and the edge of the insulating member 70 along the width direction Y can be 1 mm to 5 mm.

[0181] When the distance L2 between the edge of the first protrusion 81 and the edge of the insulating member 70 is less than 1 mm, the distance between the first protrusion 81 and the edge of the insulating member 70 is too small, increasing the possibility of electrical connection between the first protrusion 81 and the first wall 40. When the distance L2 between the edge of the first protrusion 81 and the edge of the insulating member 70 is greater than 5 mm, the distance between the first protrusion 81 and the edge of the insulating member 70 is too large, and there is a possibility that the first protrusion 81 does not provide sufficient support strength for the insulating member 70. A distance L2 between the edge of the first protrusion 81 and the edge of the insulating member 70 of 1 mm to 5 mm helps to reduce the possibility of electrical connection between the first protrusion 81 and the first wall 40, while the first protrusion 81 provides good support strength for the insulating member 70.

[0182] For example, along the width direction Y, the distance L2 between the edge of the first protrusion 81 and the edge of the insulating member 70 is 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0183] See also some of the possible implementation methods. Figure 20 As shown, a thinning recess 822 is provided on the surface of the body portion 82 facing away from the insulating member 70. The electrode tab 61 is connected to the bottom wall of the thinning recess 822. The bottom wall of the thinning recess 822 faces the body portion 62 of the electrode assembly 60.

[0184] In the height direction Z, a portion of the tab 61 can be located within the thinning recess 822. The portion of the tab 61 can reuse the thinning recess 822, which helps to improve the internal space utilization of the battery cell 30 and reduce the height of the battery cell 30, thereby increasing the energy density of the battery cell 30.

[0185] In some examples, the thickness of the body portion 82 in the thinning recess 822 may be less than the thickness of other areas of the body portion 82.

[0186] See also some of the possible implementation methods. Figure 21 As shown, along the height direction Z of the battery cell 30, a third gap 300 is formed between the first protrusion 81 and the insulating member 70. (See also...) Figure 22 As shown, a third gap 300 is formed between the body portion 82 and the insulating member 70 along the height direction Z of the battery cell 30. Both the first protrusion 81 and the body portion 82 are in a non-contact state with the insulating member 70.

[0187] Before the adapter piece 80 is connected to the electrode terminal 41, the insulating member 70 and the first wall 40 are assembled first. When the adapter piece 80 is connected to the electrode terminal 41, the first protrusion 81 and the body part 82 are not easy to contact with the insulating member 70 and the problem of positional interference occurs. This reduces the possibility of difficulty in connecting the adapter piece 80 to the electrode terminal 41 or the possibility of a loose connection at the connection point of the adapter piece 80 to the electrode terminal 41 due to positional interference, which is beneficial to improving the working efficiency of the connection between the adapter piece 80 and the electrode terminal 41 and the stability of the connection structure.

[0188] When the insulating component 70 swells upon contact with the electrolyte and deforms, the first protrusion 81 can contact the insulating component 70 to support it and prevent it from contacting the main body 62.

[0189] In some feasible ways, a third gap 300 is formed between the second protrusion 83 and the insulating member 70 along the height direction Z of the battery cell 30.

[0190] When the adapter plate 80 is connected to the electrode terminal 41, the second protrusion 83 and the insulating member 70 are not easy to contact and may cause positional interference. This reduces the possibility that the adapter plate 80 and the electrode terminal 41 may be difficult to connect due to positional interference or that there may be a loose connection at the connection point between the adapter plate 80 and the electrode terminal 41. This is beneficial to improving the working efficiency of the connection between the adapter plate 80 and the electrode terminal 41 and the stability of the connection structure.

[0191] When the insulating component 70 swells upon contact with the electrolyte and deforms, the second protrusion 83 can contact the insulating component 70 to support it and prevent it from contacting the main body 62.

[0192] In some possible implementations, the battery cell 30 includes two electrode terminals 41 and two adapter plates 80. Each electrode terminal 41 is connected to one adapter plate 80. The two electrode terminals 41 are spaced apart. The two adapter plates 80 are spaced apart.

[0193] According to some embodiments of this application, this application also provides a battery device 10, including a battery cell 30 of any of the above schemes.

[0194] According to some embodiments of this application, this application also provides an electrical device including a battery device 10 of any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0195] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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, include: The shell includes the first wall; Electrode terminals are disposed on the first wall; An insulating element is disposed within the housing, and the insulating element is disposed on one side of the first wall; An adapter plate is disposed inside the housing and is connected to the electrode terminal; An electrode assembly is disposed within the housing, the electrode assembly including tabs; The adapter includes a connected body portion and a first protrusion. The body portion and the first protrusion are located on the side of the insulating member away from the first wall. A first gap is formed between the body portion and the housing along the width direction of the first wall. At least a portion of the first protrusion is disposed within the first gap. The electrode tab is connected to the body portion, and at least a portion of the electrode tab is disposed within the first gap.

2. The battery cell of claim 1, wherein, The adapter includes an adapter portion connected to the electrode terminal. The adapter portion is located in the body portion along the width direction of the first wall, and at least a portion of the adapter portion is located on one side of the first protrusion.

3. The battery cell according to claim 1 or 2, characterized in that, Along the width direction of the first wall, a second gap is formed between the first protrusion and the housing, and the size of the first gap is larger than the size of the second gap.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The electrode tab is connected to the surface of the body that faces away from the insulating element.

5. The battery cell according to any one of claims 1 to 4, characterized in that, Along the width direction of the first wall, the first protrusions are respectively provided on opposite sides of the body portion, and the first gaps are respectively formed between the opposite sides of the body portion and the shell.

6. The battery cell of claim 5, wherein, The first protrusion includes a plurality of first teeth, which are spaced apart along the length of the first wall.

7. The battery cell according to claim 6, characterized in that, A first tooth groove is formed between two adjacent first teeth. Along the width direction of the first wall, the first protrusion extends beyond the body portion by a dimension of K1, and the depth of the first tooth groove is K2, wherein K2≤K1.

8. The battery cell of any one of claims 5 to 7, wherein, A chamfer is provided at one corner of the first protrusion to prevent fooling.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The adapter includes a second protrusion, the main body is connected to the second protrusion, the second protrusion is located on the side of the insulating member facing away from the first wall, and at least a portion of the second protrusion is disposed within the first gap.

10. The battery cell of claim 9, wherein, The second protrusion includes a plurality of second teeth, which are spaced apart along the length direction of the first wall.

11. The battery cell of claim 10, wherein, A second tooth groove is formed between two adjacent second teeth. Along the width direction of the first wall, the second protrusion extends beyond the body portion by a dimension of K3, and the depth of the second tooth groove is K4, wherein K4≤K3.

12. The battery cell of any one of claims 9 to 11, wherein, The main body includes two connecting arms, each connecting arm being connected to a second protrusion, and a first opening is formed between the two connecting arms along the width direction of the first wall.

13. The battery cell of claim 12, wherein, The insulating component includes a liquid injection hole, which is provided corresponding to the first opening.

14. The battery cell of any one of claims 9 to 13, wherein, In the same projection plane perpendicular to the height direction of the battery cell, the orthographic projection of the second protrusion lies within the orthographic projection of the insulating member.

15. The battery cell of any one of claims 1 to 14, wherein, The insulating member includes two opposite ends along its length, with the first protrusion located on the side of the insulating member facing away from the first wall.

16. The battery cell of any one of claims 1 to 15, wherein, In the same projection plane perpendicular to the height direction of the battery cell, the orthographic projections of the first protrusion and the body portion are respectively located within the orthographic projection of the insulating member.

17. The battery cell of claim 16, wherein, Along the width direction of the first wall, the distance between the edge of the first protrusion and the edge of the insulating member is 1 mm to 5 mm.

18. The battery cell of any one of claims 1 to 17, wherein, The surface of the main body facing away from the insulating member is provided with a thinning recess, and the electrode tab is connected to the bottom wall of the thinning recess.

19. The battery cell of any one of claims 1 to 18, wherein, Along the height direction of the battery cell, both the first protrusion and the body portion form a third gap with the insulating member.

20. The battery cell of any one of claims 1 to 19, wherein, In the same projection plane perpendicular to the height direction of the battery cell, the orthographic projection of the first protrusion and the orthographic projection of the electrode tab are spaced apart.

21. A battery device, characterized by Includes the battery cell as described in any one of claims 1 to 20.

22. An electrical device, comprising: Includes the battery device as described in claim 21, wherein the battery device is used to provide electrical energy.

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