Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, a shell of the battery monomer comprises a wall part, and the wall part is provided with an electrode lead-out hole; a tab of the electrode assembly extends out of the end, facing the wall part, of the electrode body, a first concave part is arranged on the side, facing the electrode body, of the wall part and located on the side, in the first direction, of the electrode leading-out hole, the first connecting part of the electrode terminal is contained in the shell, and at least part of the first connecting part and / or at least part of the tab are / is arranged in the first concave part. The tab is connected with the first connecting part, so that the space occupied by the tab and the electrode terminal in the thickness direction is reduced, a larger space can be reserved in the battery monomer for arranging the electrode main body, the energy density of the battery monomer is favorably improved, and the capacity of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for the performance of these devices are also increasing. Improving the energy density of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell has a high energy density, which is beneficial to improving the capacity of the battery device.

[0005] In a first aspect, some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and electrode terminals. The housing includes a wall portion with an electrode lead-out hole. The electrode assembly is housed in the housing and includes an electrode body and a tab. The tab extends from the end of the electrode body toward the wall portion. A first recess is provided on the side of the wall portion facing the electrode body. The first recess is located on the side of the electrode lead-out hole along a first direction, which is perpendicular to the thickness direction of the wall portion. The electrode terminals are disposed in the electrode lead-out hole and include a first connecting portion housed in the housing. At least a portion of the first connecting portion and / or at least a portion of the tab is disposed in the first recess, and the tab is connected to the first connecting portion.

[0006] In the above structure, since a first recess is provided on the side of the wall facing the electrode body, located on the side of the electrode lead hole along the first direction, the first direction is perpendicular to the thickness direction of the wall, and at least a portion of the first connecting portion and / or at least a portion of the electrode tab is provided in the first recess, the at least a portion of the first connecting portion and / or at least a portion of the electrode tab can utilize the space of the first recess, so that the at least a portion of the first connecting portion and / or at least a portion of the electrode tab and the electrode terminal can occupy the same space in the thickness direction, reducing the space occupied by the electrode tab and / or the electrode terminal in the thickness direction, so that more space can be left in the battery cell to set the electrode body, which is beneficial to improving the energy density of the battery cell, thereby increasing the capacity of the battery device.

[0007] According to some embodiments of the present application, in a battery cell, at least a portion of the first connecting portion is accommodated in a first recess, and a tab is located outside the first recess and connected to the surface of the first connecting portion away from the wall. By accommodating at least a portion of the first connecting portion in the first recess and having the tab located outside the first recess, such that the tab connects from the outside of the first recess to the surface of the first connecting portion away from the wall, the additional space occupied by the first connecting portion in the thickness direction can be reduced.

[0008] According to some embodiments of the present application, in a battery cell, at least a portion of the first connecting portion extends to the side of the first recess facing the electrode body, and a tab portion is disposed in the first recess and connected to the surface of the first connecting portion facing the wall. By extending at least a portion of the first connecting portion to the side of the first recess facing the electrode assembly, and disposing of the tab portion in the first recess and connecting it to the surface of the first connecting portion facing the wall, a portion of the tab extends into the first recess and connects to the surface of the first connecting portion facing the wall, thereby partially accommodating the tab in the first recess and reducing the additional space occupied by the tab in the thickness direction.

[0009] According to some embodiments of the present application, the battery cell is provided in which at least a portion of the first connecting portion is accommodated in the first recess, and at least a portion of the tab is accommodated in the first recess and connected to the surface of the first connecting portion facing the electrode body. This reduces the additional space occupied by the first connecting portion and the tab in the thickness direction and is beneficial to shortening the length of the tab.

[0010] According to some embodiments of the present application, the battery cell has a tab welded to a first connecting portion to form a weld portion, and at least a portion of the weld portion is located in a first recess, which reduces the additional space occupied by the tab and the first connecting portion in the thickness direction.

[0011] According to some embodiments of this application, the battery cell includes a wall portion comprising a first region and a second region connected to each other. In the thickness direction, at least a portion of the first region is spaced from the electrode body more than the distance between the second region and the electrode body. A first recess is disposed in the first region, and an electrode lead-out hole is disposed in the second region. By disposing the electrode lead-out hole in the second region, the electrode lead-out hole and the first recess are disposed in different parts of the wall portion, which facilitates the provision of different structures on the wall portion.

[0012] According to some embodiments of the present application, the battery cell has a first region and a second region arranged along a first direction; along a second direction, the size of the first recess and the size of the second region are equal, and the second direction is perpendicular to the first direction and the thickness direction of the wall, so that the first recess can better accommodate the first connecting part and the electrode tab, which helps to save the additional space occupied by the first connecting part and the electrode tab in the thickness direction.

[0013] According to some embodiments of the present application, the battery cell has a first connecting portion including a first portion and a second portion that are connected to each other. The first portion is disposed between the electrode body and the second region, and at least a portion of the second portion is located in the first recess. The tab is connected to the second portion, such that at least a portion of the first connecting portion is located in the first recess.

[0014] According to some embodiments of the present application, the battery cell includes an electrode terminal further comprising a terminal body, at least a portion of which is accommodated in an electrode lead-out hole and connected to a first surface facing away from the electrode body, such that the terminal body passing through the electrode lead-out hole can be easily connected to the first surface facing away from the electrode body.

[0015] According to some embodiments of the present application, the battery cell has a second recess on the side of the second region away from the electrode body. The electrode terminal also includes a terminal plate connected to the terminal body. At least a portion of the terminal plate is accommodated in the second recess, which can reduce the size of the electrode terminal protruding outward from the shell and improve the compactness of the battery cell structure.

[0016] According to some embodiments of the present application, the end face of the electrode terminal away from the electrode assembly is flush with the surface of the first region away from the electrode assembly, or the end face of the electrode terminal away from the electrode assembly is closer to the electrode assembly than the surface of the first region away from the electrode assembly, so that the electrode terminal will not occupy additional space of the battery cell in the thickness direction, reducing the possibility of wasted space of the electrode terminal.

[0017] According to some embodiments of this application, the battery cell further includes a first insulating member connected to the wall portion, the first insulating member being at least partially disposed between the terminal body and the wall portion. By connecting the first insulating member to the wall portion at the electrode lead-out hole, the first insulating member can isolate the wall portion from the terminal body and terminal plate, thereby insulating and isolating the wall portion from the terminal body and terminal plate, making the wall portion non-energized, and making it difficult for the wall portion to form an electrical connection with external devices.

[0018] According to some embodiments of this application, the battery cell, the terminal body, the first part, and the second part are integrally formed, so that the overall structure of the terminal body, the first part, and the second part has good strength.

[0019] According to some embodiments of the present application, a battery cell has a third recess on the side of the second portion facing the electrode body. The third recess is located on the side of the electrode lead-out hole along the first direction, and at least a portion of the tab is disposed in the third recess. By disposing at least a portion of the tab in the third recess, at least a portion of the tab can share the space in the thickness direction with the electrode lead-out hole, reducing the additional space occupied by the tab in the thickness direction.

[0020] According to some embodiments of the present application, in a battery cell, the tab is welded to the second portion to form a welded portion, which is located in the third recess, reducing the additional space occupied by the tab and the first connecting portion in the thickness direction. According to some embodiments of the present application, in a battery cell, the first connecting portion further includes a third portion connected between the first and second portions. The third portion is bent relative to the first portion toward the second portion, such that at least a portion of the second portion of the first connecting portion can be bent or stamped into the first recess, facilitating the processing and forming of the first connecting portion.

[0021] According to some embodiments of the present application, the battery cell further includes a third region connected between the first and second regions, and the third region is bent toward the second region relative to the first region. By connecting the third region between the first and second regions and bending toward the second region relative to the first region, the second region of the wall can be stamped to form a first recess, thus facilitating the processing and forming of the wall.

[0022] According to some embodiments of this application, the battery cell has a pressure relief structure on its wall. The pressure relief structure is located in the second region, which allows the pressure relief structure to avoid the first connection part of the electrode terminal and reduces the impact of the first connection part on the pressure relief structure.

[0023] According to some embodiments of this application, the battery cell has a first region with multiple regions and a second region connected between two adjacent first regions.

[0024] According to some embodiments of this application, the battery cell has multiple second regions, and the first region is connected between two adjacent second regions.

[0025] According to some embodiments of this application, the battery cell has multiple electrode lead-out holes, which are respectively disposed in multiple second regions.

[0026] According to some embodiments of this application, the battery cell further includes a second insulating member, which is at least partially disposed between the wall portion and the first connecting portion. A fourth recess is provided on the side of the second insulating member facing the electrode body, located on the side of the electrode lead-out hole along a first direction. At least a portion of the first connecting portion is disposed in the fourth recess. By disposing at least a portion of the first connecting portion in the fourth recess, at least a portion of the first connecting portion can share space in the thickness direction with the electrode lead-out hole, reducing the additional space occupied by the first connecting portion in the thickness direction.

[0027] According to some embodiments of the present application, the battery cell has a tab welded to a first connecting portion to form a weld portion, and the weld portion is located in a fourth recess, which reduces the additional space occupied by the tab and the first connecting portion in the thickness direction.

[0028] According to some embodiments of this application, the battery cell includes a housing and a cover. The housing forms a cavity with an opening, an electrode assembly is located in the cavity, and the cover closes to the opening. The cover is configured as a wall portion.

[0029] According to some embodiments of the present application, the size of the first recess along the thickness direction is A, where 0.1mm≤A≤10mm. This not only ensures that the first recess has sufficient depth to accommodate the welding part, but also prevents the first recess from wasting space due to excessive depth.

[0030] According to some embodiments of this application, the battery cell has a diameter of 0.5mm ≤ A ≤ 6mm.

[0031] According to some embodiments of this application, the battery cell further includes an adapter piece, and the electrode tab is connected to the first connection portion through the adapter piece.

[0032] Secondly, some embodiments of this application provide a battery device that includes a single battery cell provided by any of the above-described technical solutions.

[0033] Thirdly, some embodiments of this application provide an electrical device that includes the battery device provided by the above-described technical solution, the battery device being used to provide electrical energy.

[0034] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0035] Some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and electrode terminals. The housing includes a wall portion with an electrode lead-out hole. The electrode assembly is housed in the housing and includes an electrode body and a tab. The tab extends from the end of the electrode body toward the wall portion. A first recess is provided on the side of the wall portion facing the electrode body. The first recess is located on the side of the electrode lead-out hole along a first direction, which is perpendicular to the thickness direction of the wall portion. The electrode terminals are disposed in the electrode lead-out hole and include a first connecting portion housed in the housing. At least a portion of the first connecting portion and / or at least a portion of the tab is disposed in the first recess, and the tab is connected to the first connecting portion. In the above structure, since a first recess is provided on the side of the wall facing the electrode body, located on the side of the electrode lead hole along the first direction, the first direction is perpendicular to the thickness direction of the wall, and at least a portion of the first connecting portion and / or at least a portion of the electrode tab is provided in the first recess, the at least a portion of the first connecting portion and / or at least a portion of the electrode tab can utilize the space of the first recess, so that the at least a portion of the first connecting portion and / or at least a portion of the electrode tab and the electrode terminal can occupy the same space in the thickness direction, reducing the space occupied by the electrode tab and / or the electrode terminal in the thickness direction, so that more space can be left in the battery cell to set the electrode body, which is beneficial to improving the energy density of the battery cell, thereby increasing the capacity of the battery device. Attached Figure Description

[0036] 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.

[0037] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application;

[0038] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0039] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0040] Figure 4 Cross-sectional views of electrode assemblies provided in some embodiments of this application;

[0041] Figure 5 for Figure 4 Enlarged view at point F;

[0042] Figure 6 This is a structural schematic diagram of the wall portion of a battery cell provided in some embodiments of this application from one perspective;

[0043] Figure 7 This is a schematic diagram of the structure of the electrode terminals of a battery cell provided in some embodiments of this application;

[0044] Figure 8 This is a structural schematic diagram of the wall portion of a battery cell provided in some embodiments of this application from another perspective.

[0045] In the diagram:

[0046] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 7. Battery cell; 8. Outer shell; 81. Wall section; 811. First zone; 8111. First recess; 812. Second zone; 8121. Second recess; 8122. Electrode lead-out hole; 813. Third zone; 82. Cover; 821. Pressure relief structure; 83. Shell; 84. Cavity; 9. 91. Electrode assembly; 92. Electrode body; 93. Electrode tab; 10. Welding part; 10. Electrode terminal; 101. Terminal body; 102. First connecting part; 1021. First part; 1022. Second part; 10221. Third recess; 1023. Third part; 103. Terminal plate; 11. First insulating member; 12. Second insulating member; 121. Protrusion; 122. Fourth recess; X, thickness direction; Y, first direction; Z, second direction. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 used in individual battery cells such as energy storage containers or energy storage cabinets. Furthermore, the capacity requirements for battery devices are constantly increasing.

[0054] 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 connected in series, parallel, or mixed connections via a busbar.

[0055] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0056] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0057] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0058] 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.

[0059] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0060] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0061] 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 an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0062] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] Currently, in battery cells, to facilitate electrical connection between the electrode assembly and the electrode terminals, an adapter is typically incorporated. This adapter is positioned in the space between the electrode terminals and the electrode assembly, and is welded to the tabs and terminals of the electrode assembly. To facilitate welding the tabs to the adapter, the tabs must extend a certain length from the electrode body of the electrode assembly. Sufficient space must be left between the battery cell casing and the electrode body to accommodate the tabs and adapter, thus encroaching on the space of the electrode body. This hinders the increase in the size of the electrode body and is detrimental to improving the energy density of the battery cell.

[0068] To improve the energy density of a single battery cell, some embodiments of this application provide a single battery cell including a housing, an electrode assembly, and electrode terminals. The housing includes a wall portion with an electrode lead-out hole. The electrode assembly is housed in the housing and includes an electrode body and a tab. The tab extends from the end of the electrode body toward the wall portion. A first recess is provided on the side of the wall portion facing the electrode body. The first recess is located on the side of the electrode lead-out hole along a first direction, which is perpendicular to the thickness direction of the wall portion. The electrode terminals are disposed in the electrode lead-out hole and include a first connecting portion housed in the housing. At least a portion of the first connecting portion and / or at least a portion of the tab is disposed in the first recess, and the tab is connected to the first connecting portion. In the above structure, since a first recess is provided on the side of the wall facing the electrode body, located on the side of the electrode lead hole along the first direction, the first direction is perpendicular to the thickness direction of the wall, and at least a portion of the first connecting portion and / or at least a portion of the electrode tab is provided in the first recess, the at least portion of the first connecting portion and / or at least a portion of the electrode tab can utilize the space of the first recess, reducing the additional space occupied by the electrode tab and / or electrode terminal in the thickness direction, so that more space can be left in the battery cell to set the electrode body, which is beneficial to improve the energy density of the battery cell, thereby increasing the capacity of the battery device.

[0069] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0070] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. 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, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. 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, etc.

[0071] 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.

[0072] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0073] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0074] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0075] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0076] Figure 2 This is a schematic diagram showing the disassembled structure of the battery device 2 provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0077] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0078] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0079] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called the upper box cover, and the second box part 5b can also be called the lower box 5.

[0080] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells 7 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 5.

[0081] Some embodiments of this application provide a battery cell 7, see reference Figures 3 to 5The battery cell 7 includes a housing 8, an electrode assembly 9, and an electrode terminal 10. The housing 8 includes a wall portion 81, which has an electrode lead-out hole 8122. The electrode assembly 9 is housed in the housing 8 and includes an electrode body 91 and a tab 92. The tab 92 extends from the end of the electrode body 91 toward the wall portion 81. A first recess 8111 is provided on the side of the wall portion 81 facing the electrode body 91. The first recess 8111 is located on the side of the electrode lead-out hole 8122 along a first direction Y, which is perpendicular to the thickness direction X of the wall portion 81. The electrode terminal is disposed in the electrode lead-out hole 8122. The electrode terminal 10 includes a first connecting portion 102 housed in the housing 8. At least a portion of the first connecting portion 102 and / or at least a portion of the tab 92 is disposed in the first recess 8111. The tab 92 is connected to the first connecting portion 102.

[0082] The outer casing 8 can be a component in the battery cell 7 used to form a sealed space, which is used to accommodate other components in the battery cell 7. The wall portion 81 is a partial wall structure in the outer casing 8, which is used to form a sealed space in the outer casing 8.

[0083] Electrode assembly 9 is a component in battery cell 7 where an electrochemical reaction occurs. The housing 8 may contain one or more electrode assemblies 9. A tab 92 extends from the end of electrode body 91 toward wall portion 81. The electrode assembly 9 may include electrode body 91 and tab 92, with the tab 92 extending from one end of electrode body 91 toward wall portion 81. The tab 92 is used to connect to electrode terminal 10, allowing electrical energy from the electrode assembly 9 to be transferred to the electrode terminal 10.

[0084] The electrode body 91 may include a positive electrode, a negative electrode, and a separator. The positive and negative electrode can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrode to isolate them, preventing short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0085] The first recess 8111 may be a recessed structure provided on the wall portion 81. The first recess 8111 is provided on the side of the wall portion 81 facing the electrode body 91, which may be formed by the side of the wall portion 81 facing the electrode body 91 being recessed inward.

[0086] The first direction Y can be a direction perpendicular to the thickness direction X of the wall portion 81. The first recess 8111 is located on one side of the electrode lead-out hole 8122 along the first direction Y. It can be that the projection of the first recess 8111 and the projection of the electrode lead-out hole 8122 overlap in the first direction Y, so that the first recess 8111 and the electrode lead-out hole 8122 can occupy the same space in the thickness direction X.

[0087] The electrode terminal 10, as a component disposed at the electrode lead-out hole 8122, can be used to electrically connect to an external electrical device or charging device of the battery cell 7 so that the battery cell 7 can be charged and discharged. The electrode terminal 10 may include, but is not limited to, a cylindrical structure, an elliptical cylindrical structure, etc., and those skilled in the art can set it according to the actual situation.

[0088] The first connecting portion 102 is part of the electrode terminal 10 and is housed in the housing 8. The first connecting portion 102 may be located in the sealed space formed by the housing 8.

[0089] At least a portion of the first connecting portion 102 and / or at least a portion of the electrode tab 92 is disposed in the first recess 8111. This can be achieved by: at least a portion of the first connecting portion 102 being accommodated in the first recess 8111, allowing at least a portion of the first connecting portion 102 to share space in the thickness direction X with the electrode lead-out hole 8122, thus reducing the additional space occupied by the first connecting portion 102 in the thickness direction X; or at least a portion of the electrode tab 92 being accommodated in the first recess 8111, allowing at least a portion of the electrode tab 92 to share space in the thickness direction X with the electrode lead-out hole 8122, thus reducing the additional space occupied by the electrode tab 92 in the thickness direction X; or at least a portion of the first connecting portion 102 and at least a portion of the electrode tab 92 being accommodated in the first recess 8111, allowing at least a portion of the first connecting portion 102 and at least a portion of the electrode tab 92 to share space in the thickness direction X with the electrode lead-out hole 8122, thus reducing the additional space occupied by the first connecting portion 102 and the electrode tab 92 in the thickness direction X.

[0090] The tab 92 is connected to the first connecting portion 102, either by welding or by bonding with conductive adhesive. Exemplarily, the tab 92 can be connected to the surface of the first connecting portion 102 facing the wall portion 81, the tab 92 can be connected to the surface of the first connecting portion 102 away from the wall portion 81, or the surface between the surface of the first connecting portion 102 away from the wall portion 81 and the surface facing the wall portion 81.

[0091] In the above structure, since the wall portion 81 facing the electrode body 91 has a first recess 8111 located on the side of the electrode lead-out hole 8122 along the first direction Y, the first direction Y is perpendicular to the thickness direction X of the wall portion 81, and at least a portion of the first connecting portion 102 and / or at least a portion of the tab 92 is disposed in the first recess 8111, at least a portion of the first connecting portion 102 and / or at least a portion of the tab 92 can utilize the space of the first recess 8111, reducing the additional space occupied by the tab 92 and / or the electrode terminal 10 in the thickness direction X, so that more space can be left in the battery cell 7 to accommodate the electrode body 91, which is beneficial to improving the energy density of the battery cell 7, thereby increasing the capacity of the battery device 2.

[0092] In some embodiments, at least a portion of the first connecting portion 102 is accommodated in the first recess 8111, and the tab 92 is located outside the first recess 8111 and connected to the surface of the first connecting portion 102 away from the wall portion 81.

[0093] At least a portion of the first connecting portion 102 is accommodated in the first recess 8111. This can be either a portion of the first connecting portion 102 is accommodated in the first recess 8111, while another portion of the first connecting portion 102 is located outside the first recess 8111; or the entire first connecting portion 102 is accommodated in the first recess 8111.

[0094] By accommodating at least a portion of the first connecting portion 102 within the first recess 8111, and with the tab 92 located outside the first recess 8111, such that the tab 92 connects from the outside of the first recess 8111 to the surface of the first connecting portion 102 away from the wall portion 81, the additional space occupied by the first connecting portion 102 in the thickness direction X can be reduced.

[0095] In some embodiments, at least a portion of the first connecting portion 102 extends to the side of the first recess 8111 facing the electrode assembly 9, and the tab 92 is partially disposed in the first recess 8111 and connected to the surface of the first connecting portion 102 facing the wall portion 81.

[0096] At least a portion of the first connecting portion 102 extends to the side of the first recess 8111 facing the electrode assembly 9, which may mean that the first connecting portion 102 is located outside the first recess 8111 and at least a portion is located on the side of the first recess 8111 facing the electrode body 91.

[0097] By extending at least a portion of the first connecting portion 102 to the side of the first recess 8111 facing the electrode assembly 9, and by partially disposing of the tab 92 in the first recess 8111 and connecting it to the surface of the first connecting portion 102 facing the wall portion 81, a portion of the tab 92 extends into the first recess 8111 and connects to the surface of the first connecting portion 102 facing the wall portion 81, thereby partially accommodating the tab 92 in the first recess 8111 and reducing the additional space occupied by the tab 92 in the thickness direction X.

[0098] In some embodiments, at least a portion of the first connecting portion 102 is accommodated in the first recess 8111, and at least a portion of the tab 92 is accommodated in the first recess 8111 and connected to the surface of the first connecting portion 102 facing the electrode body 91.

[0099] By accommodating at least a portion of the first connecting portion 102 within the first recess 8111, and at least a portion of the tab 92 within the first recess 8111, the additional space occupied by the first connecting portion 102 and the tab 92 in the thickness direction X is reduced.

[0100] By connecting the tab 92 to the surface of the first connecting portion 102 facing the electrode body 91, the tab 92 is connected to the first connecting portion 102 from the outside of the first recess 8111, which helps to shorten the length of the tab 92.

[0101] In some embodiments, the tab 92 is welded to the first connection portion 102 to form a weld portion 93, and at least a portion of the weld portion 93 is located in the first recess 8111.

[0102] The tab 92 is welded to the first connecting portion 102 to form a weld portion 93. Alternatively, the tab 92 may be welded to the first connecting portion 102 to form the weld portion 93 between the tab 92 and the first connecting portion 102. At least a portion of the weld portion 93 is disposed in the first recess 8111. Alternatively, the entire weld portion 93 may be disposed in the first recess 8111, or a portion of the weld portion 93 may be disposed in the first recess 8111, while another portion of the weld portion 93 may be located outside the first recess 8111.

[0103] By providing at least a portion of the welding portion 93 in the first recess 8111, the projection of at least a portion of the welding portion 93 in the first direction Y and the projection of the electrode lead-out hole 8122 in the first direction Y overlap, thereby causing the projection of at least a portion of the tab 92 in the first direction Y and the projection of the electrode lead-out hole 8122 in the first direction Y to overlap, reducing the space occupied by the tab 92 and the electrode terminal 10 in the thickness direction X.

[0104] In some embodiments, the wall portion 81 includes a first region 811 and a second region 812 that are connected to each other. In the thickness direction X, at least a portion of the first region 811 is spaced from the electrode body 91 at a distance greater than the distance between the second region 812 and the electrode body 91. A first recess 8111 is disposed in the first region 811, and an electrode lead-out hole 8122 is disposed in the second region 812.

[0105] The first region 811 and the second region 812 are two interconnected parts of the wall portion 81. In the thickness direction X, the distance between the first region 811 and the electrode body 91 is greater than the distance between the second region 812 and the electrode body 91. This means that in the thickness direction X, the first region 811 is further away from the electrode body 91 than the second region 812, so that the first region 811 is recessed in a direction away from the electrode body 91 compared to the second region 812. This allows the first region 811 to correspond to the bottom surface of the first recess 8111, and the first recess 8111 is provided in the first region 811.

[0106] By setting the electrode lead-out hole 8122 in the second region 812, the electrode lead-out hole 8122 and the first recess 8111 are set in different parts of the wall portion 81, which facilitates setting different structures on the wall portion 81.

[0107] In some embodiments, the first region 811 and the second region 812 are arranged along the first direction Y; along the second direction Z, the size of the first recess 8111 and the size of the second region 812 are equal, and the second direction Z is perpendicular to the first direction Y and the thickness direction X of the wall portion 81.

[0108] By arranging the first region 811 and the second region 812 along the first direction Y, the first recess 8111 located in the first region 811 and the electrode lead-out hole 8122 located in the second region 812 can be arranged along the first direction Y, such that the first recess 8111 is located on one side of the electrode lead-out hole 8122 along the first direction Y.

[0109] By setting the second direction Z to be perpendicular to the first direction Y and the thickness direction X of the wall portion 81, the thickness direction X of the wall portion 81, the first direction Y, and the second direction Z are mutually perpendicular. By making the dimensions of the first recess 8111 along the second direction Z and the second region 812 along the second direction Z equal, the first recess 8111 can better accommodate the first connecting portion 102 and the tab 92, which helps to save the additional space occupied by the first connecting portion 102 and the tab 92 in the thickness direction X.

[0110] In some embodiments, the first connecting portion 102 includes a first portion 1021 and a second portion 1022 that are connected to each other. The first portion 1021 is disposed between the electrode body 91 and the second region 812, and at least a portion of the second portion 1022 is located in the first recess 8111. The tab 92 is connected to the second portion 1022.

[0111] The first part 1021 and the second part 1022 are two interconnected parts of the first connecting part 102. The first part 1021 is the part disposed between the electrode body 91 and the second region 812, and the second part 1022 is the part at least partially located in the first recess 8111.

[0112] The connection between the tab 92 and the second part 1022 can be achieved by welding the tab 92 to the second part 1022, allowing the materials of the tab 92 and the second part 1022 to fuse together, which improves the strength of the connection between the tab 92 and the second part 1022. For example, the welding of the tab 92 to the second part 1022 can be either welding the tab 92 to the surface of the second part 1022 facing the electrode body 91, or welding the tab 92 to the surface of the second part 1022 facing the wall portion 81.

[0113] In some embodiments, the electrode terminal 10 further includes a terminal body 101, at least a portion of which is accommodated in the electrode lead-out hole 8122 and connected to the surface of the first part 1021 opposite to the electrode body 91.

[0114] The terminal body 101 and the first connecting portion 102 are different parts of the electrode terminal 10 that are connected to each other. At least a portion of the terminal body 101 is accommodated in the electrode lead-out hole 8122. This can be the case that the entire terminal body 101 is accommodated in the electrode lead-out hole 8122, or it can be that a portion of the terminal body 101 is accommodated in the electrode lead-out hole 8122, while another portion of the terminal body 101 extends outward from the electrode lead-out hole 8122.

[0115] The terminal body 101 is connected to the surface of the first part 1021 that is away from the electrode body 91. This can be achieved by the first part 1021 being positioned opposite the terminal body 101 along the thickness direction X, so that the terminal body 101, which passes through the electrode lead-out hole 8122, can be easily connected to the surface of the first part 1021 that is away from the electrode body 91.

[0116] In some embodiments, reference Figure 6 The second region 812 has a second recess 8121 on the side opposite to the electrode body 91. The electrode terminal 10 also includes a terminal plate 103, which is connected to the terminal body 101. At least a portion of the terminal plate 103 is accommodated in the second recess 8121.

[0117] The second recess 8121 can be a recessed structure formed by the side of the second region 812 that is recessed inward from the side of the second region 812 away from the electrode body 91.

[0118] The terminal plate 103 can be a structure provided on the electrode terminal 10. It is located on the side of the second region 812 away from the electrode body 91 and connected to the terminal body 101, and can be used to connect the electrode terminal 10 to the wall portion 81. The terminal plate 103 is connected to the terminal body 101. The terminal plate 103 can be provided on the outside of the wall portion 81 as a riveting structure. The terminal plate 103 is provided with a riveting hole. The terminal body 101 extending from the electrode lead-out hole 8122 passes through the riveting hole and is riveted to the terminal plate 103, so that the electrode terminal 10 can be firmly connected to the wall portion 81 by riveting.

[0119] By accommodating at least a portion of the terminal plate 103 in the second recess 8121, the second recess 8121 can accommodate at least a portion of the electrode terminals 10, thereby reducing the size of the electrode terminals 10 protruding outward from the housing 8, which is beneficial to improving the compactness of the battery cell 7 structure.

[0120] In some embodiments, the end face of the electrode terminal 10 away from the electrode assembly 9 is flush with the surface of the first region 811 away from the electrode assembly 9, or the end face of the electrode terminal 10 away from the electrode assembly 9 is closer to the electrode assembly 9 than the surface of the first region 811 away from the electrode assembly 9.

[0121] By making the end face of the electrode terminal 10 away from the electrode assembly 9 flush with the surface of the first region 811 away from the electrode assembly 9, the electrode terminal 10 will not protrude outward from the second recess 8121, so that the electrode terminal 10 will not occupy additional space of the battery cell 7 in the thickness direction X, thus reducing the possibility of wasting space on the electrode terminal 10.

[0122] Similarly, by making the end face of the electrode terminal 10 away from the electrode assembly 9 closer to the electrode assembly 9 than the surface of the first region 811 away from the electrode assembly 9, the electrode terminal 10 will not protrude outward from the second recess 8121, so that the electrode terminal 10 will not occupy additional space of the battery cell 7 in the thickness direction X, thus reducing the possibility of wasting space on the electrode terminal 10.

[0123] In some embodiments, the battery cell 7 further includes a first insulating member 11 connected to the wall portion 81, the first insulating member 11 being at least partially disposed between the terminal body 101 and the wall portion 81.

[0124] The first insulating member 11 may be a component with insulating properties. The first insulating member 11 is at least partially disposed between the terminal body 101 and the wall portion 81, insulating and isolating the wall portion 81 from the terminal body 101. Exemplarily, at least a portion of the first insulating member 11 is disposed in the gap between the wall portion 81 and the terminal body 101.

[0125] By connecting the first insulating member 11 to the wall portion 81 at the electrode lead-out hole 8122, the first insulating member 11 can isolate the wall portion 81 from the terminal body 101 and the terminal plate 103, thereby insulating the wall portion 81 from the terminal body 101 and the terminal plate 103, making the wall portion 81 non-energized, and making it difficult for the wall portion 81 to be electrically connected to external devices.

[0126] In some embodiments, reference Figure 7 The terminal body 101, the first part 1021, and the second part 1022 are integrally formed.

[0127] The terminal body 101, the first part 1021, and the second part 1022 are integrally formed, meaning they are manufactured using an integral molding process. The terminal body 101, the first part 1021, and the second part 1022 can be manufactured using integral molding methods such as stamping, allowing for simultaneous overall manufacturing. This not only facilitates the manufacturing of the terminal body 101, the first part 1021, and the second part 1022 but also ensures good overall structural strength. Alternatively, the terminal body 101, the first part 1021, and the second part 1022 can also be manufactured using machining methods such as milling, by processing a single piece of raw material.

[0128] In some embodiments, a third recess 10221 is provided on the side of the second part 1022 facing the electrode body 91. The third recess 10221 is located on the side of the electrode lead-out hole 8122 along the first direction Y, and at least a portion of the tab 92 is provided in the third recess 10221.

[0129] The third recess 10221 can be a recessed structure provided on the second part 1022. The third recess 10221 is provided on the side of the second part 1022 facing the electrode body 91. Specifically, the side of the second part 1022 facing the electrode body 91 is recessed inward to form the third recess 10221. The third recess 10221 is located on the side of the electrode lead-out hole 8122 along the first direction Y. Specifically, in the first direction Y, the projection of the third recess 10221 and the projection of the electrode lead-out hole 8122 overlap, so that the third recess 10221 and the electrode lead-out hole 8122 can occupy the same space in the thickness direction X.

[0130] By providing at least a portion of the tab 92 in the third recess 10221, at least a portion of the tab 92 can share the space in the thickness direction X with the electrode lead-out hole 8122, thereby reducing the additional space occupied by the tab 92 in the thickness direction X.

[0131] In some embodiments, the tab 92 is welded to the second portion 1022 to form a welding portion 93, and the welding portion 93 is located in the third recess 10221.

[0132] The tab 92 is welded to the second part 1022 to form a welded part 93. Alternatively, the tab 92 may be welded to the second part 1022 to form the welded part 93 between the tab 92 and the second part 1022. The welded part 93 is disposed in the third recess 10221. Alternatively, the entire welded part 93 may be disposed in the third recess 10221.

[0133] By placing the welding part 93 in the third recess 10221, the projection of the welding part 93 in the first direction Y and the projection of the electrode lead-out hole 8122 in the first direction Y overlap, thereby making the projections of part of the tab 92 and the first connecting part 102 in the first direction Y overlap with the projection of the electrode lead-out hole 8122 in the first direction Y, reducing the additional space occupied by the tab 92 and the first connecting part 102 in the thickness direction X.

[0134] In some embodiments, the first connecting portion 102 further includes a third portion 1023, which is connected between the first portion 1021 and the second portion 1022, and the third portion 1023 is bent toward the second portion 1022 relative to the first portion 1021.

[0135] The third part 1023 may be the portion of the first connecting part 102 used to connect the first part 1021 and the second part 1022. (See reference) Figure 8 The third part 1023 is connected between the first part 1021 and the second part 1022, and is bent relative to the first part 1021 toward the second part 1022, so that at least a portion of the second part 1022 of the first connecting part 102 can be bent or stamped into the first recess 8111, making the processing and forming of the first connecting part 102 convenient.

[0136] In some embodiments, the wall portion 81 further includes a third region 813, which is connected between the first region 811 and the second region 812, and the third region 813 bends toward the second region 812 relative to the first region 811.

[0137] The third region 813 can be the part of the wall portion 81 used to connect the first region 811 and the second region 812. The third region 813 is connected between the first region 811 and the second region 812 and is bent relative to the first region 811 toward the second region 812, so that the second region 812 of the wall portion 81 can be formed by stamping the first recess 8111, which makes the processing and forming of the wall portion 81 convenient.

[0138] In some embodiments, the wall portion 81 is provided with a pressure relief structure 821, which is located in the second region 812.

[0139] The pressure relief structure 821 can be a structure that connects the cavity 84 to the outside when the internal pressure of the battery cell 7 reaches a preset value, and it is used to relieve pressure in the cavity 84 of the battery cell 7.

[0140] For example, the pressure relief structure 821 can achieve pressure relief by forming grooves on the wall portion 81 for thickness reduction, causing the wall portion 81 to rupture at the grooves when the pressure inside the housing 8 exceeds a preset pressure. This type of pressure relief structure 821 can be integrally formed with the wall portion 81 by a stamping process.

[0141] By placing the pressure relief structure 821 in the second region 812, the pressure relief structure 821 can avoid the first connection portion 102 of the electrode terminal 10, thereby reducing the impact of the first connection portion 102 on the pressure relief structure 821.

[0142] In some embodiments, there are multiple first regions 811, and a second region 812 is connected between two adjacent first regions 811.

[0143] By setting multiple first regions 811, the second region 812 is connected between two adjacent first regions 811, so that the second region 812, which is recessed from the outside of the battery cell 7, is located in the middle of the wall portion 81, so that the wall portion 81 has a centrally recessed shape.

[0144] In some embodiments, multiple electrode lead-out holes 8122 are provided, and the multiple electrode lead-out holes 8122 are spaced apart in the second region 812.

[0145] By providing multiple electrode lead-out holes 8122 at intervals on the second region 812, electrode terminals 10 with different polarities can be provided on the wall portion 81, so that electrode terminals 10 with different polarities are provided on the same end of the battery cell 7.

[0146] In some embodiments, multiple second regions 812 are spaced apart, and a first region 811 is connected between two adjacent second regions 812.

[0147] By setting multiple second zones 812, the first zone 811 is connected between two adjacent second zones 812, so that the second zone 812, which is recessed from the outside of the battery cell 7, is located on the side of the wall portion 81, so that the wall portion 81 has a side-recessed shape.

[0148] In some embodiments, multiple electrode lead-out holes 8122 are provided, and the multiple electrode lead-out holes 8122 are respectively disposed in multiple second regions 812.

[0149] Multiple electrode lead-out holes 8122 are respectively disposed in multiple second regions 812. The number of electrode lead-out holes 8122 is equal to the number of second regions 812, and the electrode lead-out holes 8122 are disposed one-to-one on the second regions 812.

[0150] By providing multiple electrode lead-out holes 8122 on multiple second zones 812 respectively, electrode terminals 10 with different polarities can be provided on the side portion of the wall portion 81, so that electrode terminals 10 with different polarities are provided on the same end of the battery cell 7.

[0151] In some embodiments, the battery cell 7 further includes a second insulating member 12, which is at least partially disposed between the wall portion 81 and the first connecting portion 102. A fourth recess 122 is provided on the side of the second insulating member 12 facing the electrode body 91. The fourth recess 122 is located on the side of the electrode lead-out hole 8122 along the first direction Y. The first connecting portion 102 is at least partially disposed in the fourth recess 122.

[0152] The second insulating member 12 may be a component with insulating properties. The second insulating member 12 is at least partially disposed between the wall portion 81 and the first connecting portion 102, isolating the wall portion 81 from the first connecting portion 102. Alternatively, the second insulating member 12 may be disposed on the surface of the wall portion 81 facing the electrode assembly 9 to insulate the wall portion 81 from the internal components of the battery cell 7.

[0153] The fourth recess 122 may be a recessed structure provided on the second insulating member 12. The fourth recess 122 is provided on the side of the second insulating member 12 facing the electrode body 91, and may be formed by the side of the fourth recess 122 facing the electrode body 91 being recessed inward. The fourth recess 122 is located on the side of the electrode lead-out hole 8122 along the first direction Y, and may be such that the projection of the fourth recess 122 and the projection of the electrode lead-out hole 8122 overlap in the first direction Y, so that the fourth recess 122 and the electrode lead-out hole 8122 can occupy the same space in the thickness direction X.

[0154] By providing at least a portion of the first connecting portion 102 in the fourth recess 122, at least a portion of the first connecting portion 102 can share the space in the thickness direction X with the electrode lead-out hole 8122, thereby reducing the additional space occupied by the first connecting portion 102 in the thickness direction X.

[0155] In some embodiments, the second insulating member 12 is provided with a protrusion 121 protruding toward the electrode body 91.

[0156] By providing a protrusion 121 protruding towards the electrode body 91 in the second insulating member 12, the protrusion 121 can limit the electrode body 91, reducing the possibility of the electrode body 91 shaking, which is beneficial to improving the reliability of the battery cell 7.

[0157] In some embodiments, the tab 92 is welded to the first connecting portion 102 to form a welding portion 93, and the welding portion 93 is located in the fourth recess 122.

[0158] By placing the welding part 93 in the fourth recess 122, the projection of the welding part 93 in the first direction Y and the projection of the electrode lead-out hole 8122 in the first direction Y overlap, thereby making the projections of part of the tab 92 and the first connecting part 102 in the first direction Y overlap with the projection of the electrode lead-out hole 8122 in the first direction Y, reducing the additional space occupied by the tab 92 and the first connecting part 102 in the thickness direction X.

[0159] In some embodiments, the housing 8 includes a housing 83 and a cover 82, the housing 83 forming a cavity 84 with an opening, the electrode assembly 9 being located in the cavity 84, and the cover 82 covering the opening, the cover 82 being configured as a wall portion 81.

[0160] The housing 83 and the cover 82 are two interconnected parts of the outer casing 8. The housing 83 forms a cavity 84 with one open end, allowing components such as the electrode assembly 9 to be easily inserted into the cavity 84 through the opening. The cover 82 is a part used to seal the opening, and its seal fits onto the housing 83 to form a sealed space in the cavity 84. By configuring the cover 82 as a wall portion 81, the electrode terminal 10 is disposed on the cover 82. Since the cover 82 has a smaller size than the housing 83, the electrode terminal 10 can be disposed on the cover 82 more conveniently.

[0161] For example, the cover 82 and the electrode terminal 10 can be provided as inserts in the injection mold. The first insulating member 11 is formed by filling the gap between the cover 82 and the electrode terminal 10 in the injection mold. The first insulating member 11 connects the cover 82 and the first terminal portion and seals the gap between the cover 82 and the electrode terminal 10.

[0162] In some embodiments, the dimension of the first recess 8111 along the thickness direction X is A, where 0.1mm≤A≤10mm.

[0163] The dimension A of the first recess 8111 along the thickness direction X can be set as the minimum dimension of the first recess 8111 in the thickness direction X. For example, when the dimension of the first recess 8111 in the thickness direction X is not uniform, the dimension A of the first recess 8111 along the thickness direction X is the minimum depth of the first recess 8111 in the thickness direction X.

[0164] By setting the dimension A of the first recess 8111 along the thickness direction X to a range of 0.1mm≤A≤10mm, not only is the first recess 8111 made deep enough to accommodate the welding part 93, but the first recess 8111 is also less likely to waste space due to excessive depth.

[0165] In some embodiments, the dimension A of the first recess 8111 along the thickness direction X is set to be 0.5mm ≤ A ≤ 6mm. For example, the dimension A of the first recess 8111 along the thickness direction X can be set to 0.5mm, 2mm, 4mm or 6mm, which not only ensures that the first recess 8111 has sufficient depth to accommodate the welding part 93, but also prevents the first recess 8111 from wasting space due to excessive depth.

[0166] In some embodiments, the battery cell 7 further includes an adapter plate, and the tab 92 is connected to the first connection portion 102 via the adapter plate.

[0167] The electrode 92 is connected to the first connecting part 102 via an adapter piece. Alternatively, the adapter piece can be connected to the first connecting part 102, and the electrode 92 can be connected to the adapter piece, thus achieving an electrical connection between the electrode 92 and the first connecting part 102. The electrode 92 is soldered to the first connecting part 102 via the adapter piece, resulting in a relatively secure connection between the electrode 92 and the first connecting part 102.

[0168] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided by the above-described technical solution.

[0169] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, and the battery device 2 is used to provide electrical energy.

[0170] Some embodiments of this application provide a battery cell 7, which includes a housing 8, an electrode assembly 9, and an electrode terminal 10. The housing 8 includes a shell 83 and a cover 82. The shell 83 forms a cavity 84 with an opening. The electrode assembly 9 is located in the cavity 84. The cover 82 covers the opening. A first recess 811 is provided on the side of the first region 811 facing the electrode body 91. An electrode tab 92 extending from the end of the electrode body 91 toward the wall portion 81 is welded to a first connecting portion 102 to form a welding portion 93. At least a portion of the welding portion 93 is provided in the first recess 8111. A second recess 8121 is provided on the side of the second region 812 away from the electrode body 91. The terminal plate 103 of the electrode terminal 10 is connected to the second region 812. The end face of the electrode terminal 10 away from the electrode assembly 9 is flush with the surface of the first region 811 away from the electrode assembly 9.

[0171] In the above structure, since at least a portion of the welded portion 93 formed by the tab 92 and the electrode terminal 10 is disposed in the first recess 8111, the welded portion 93 and the electrode terminal 10 can occupy the same space in the thickness direction X, reducing the additional space occupied by the tab 92 and the electrode terminal 10 in the thickness direction X. This allows for more space in the battery cell 7 to accommodate the electrode body 91, which is beneficial to improving the energy density of the battery cell 7 and thus increasing the capacity of the battery device 2.

[0172] 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, The battery cell comprises: a housing comprising a wall portion provided with an electrode lead-out hole; an electrode assembly accommodated in the housing, the electrode assembly comprising an electrode body and a tab, the tab extending from the electrode body toward an end of the wall portion, a first recess being provided on a side of the wall portion facing the electrode body, the first recess being located on a side of the electrode lead-out hole in a first direction perpendicular to a thickness direction of the wall portion; an electrode terminal provided in the electrode lead-out hole, the electrode terminal comprising a first connecting portion accommodated in the housing, at least a portion of the first connecting portion and / or at least a portion of the tab being provided in the first recess, the tab being connected to the first connecting portion.

2. The battery cell of claim 1, wherein, At least a portion of the first connecting portion is accommodated in the first recess, and the tab is located outside the first recess and connected to a surface of the first connecting portion facing away from the wall portion.

3. The battery cell of claim 1, wherein, At least a portion of the first connecting portion extends to a side of the first recess facing the electrode body, and the tab is partially provided in the first recess and connected to a surface of the first connecting portion facing the wall portion.

4. The battery cell of claim 1, wherein, At least a portion of the first connecting portion is accommodated in the first recess, and at least a portion of the tab is accommodated in the first recess and connected to a surface of the first connecting portion facing the electrode body.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The tab is welded to the first connecting portion to form a welded portion, and at least a portion of the welded portion is located in the first recess.

6. The battery cell of any one of claims 1 to 5, wherein, The wall portion comprises a first region and a second region connected to each other, in the thickness direction, a distance between at least a portion of the first region and the electrode body is greater than a distance between the second region and the electrode body, the first recess is provided in the first region, and the electrode lead-out hole is provided in the second region.

7. The battery cell of claim 6, wherein, The first region and the second region are arranged in the first direction, and in a second direction perpendicular to the first direction and the thickness direction of the wall portion, a size of the first recess is equal to a size of the second region.

8. The battery cell according to claim 6 or 7, characterized in that The first connecting portion comprises a first portion and a second portion connected to each other, the first portion is provided between the electrode body and the second region, at least a portion of the second portion is located in the first recess, and the tab is connected to the second portion.

9. The battery cell of claim 8, wherein, The electrode terminal further comprises a terminal body, at least a portion of the terminal body is accommodated in the electrode lead-out hole and connected to a surface of the first portion facing away from the electrode body.

10. The battery cell of claim 9, wherein, A second recess is provided on a side of the second region facing away from the electrode body, and the electrode terminal further comprises a terminal plate connected to the terminal body, at least a portion of the terminal plate is accommodated in the second recess.

11. The battery cell of claim 10, wherein, An end surface of the electrode terminal away from the electrode assembly is flush with a surface of the first region away from the electrode assembly, or the end surface of the electrode terminal away from the electrode assembly is closer to the electrode assembly than the surface of the first region away from the electrode assembly.

12. The battery cell of any one of claims 9 to 11, wherein, The battery cell further comprises a first insulating member connected to the wall portion, the first insulating member is at least partially provided between the terminal body and the wall portion.

13. The battery cell of any one of claims 9 to 12, wherein, The terminal body, the first portion, and the second portion are integrally formed.

14. The battery cell of any one of claims 8 to 13, wherein, The second part is provided with a third recess on a side facing the electrode body, the third recess is located on a side of the electrode lead-out hole along the first direction, and at least part of the tab is arranged in the third recess.

15. The battery cell of claim 14, wherein, The tab is welded to the second part to form a welded part, and the welded part is located in the third recess.

16. The battery cell of any one of claims 8 to 15, wherein, The first connecting part further comprises a third part connected between the first part and the second part, and the third part is bent towards the second part relative to the first part.

17. The battery cell of any one of claims 6 to 16, wherein, The wall part further comprises a third region connected between the first region and the second region, and the third region is bent towards the second region relative to the first region.

18. The battery cell of any one of claims 6 to 17, wherein, The wall part is provided with a pressure relief structure, and the pressure relief structure is located in the second region.

19. The battery cell of any one of claims 6 to 18, wherein, The first region is provided with a plurality of first regions, and the second region is connected between two adjacent first regions.

20. The battery cell of any one of claims 6 to 19, wherein, The second region is provided with a plurality of second regions, and the first region is connected between two adjacent second regions.

21. The battery cell of claim 20, wherein, The electrode lead-out hole is provided with a plurality of electrode lead-out holes, and each of the plurality of electrode lead-out holes is arranged in a plurality of second regions.

22. The battery cell of any one of claims 1 to 21, wherein, The battery monomer further comprises a second insulating part, the second insulating part is at least partially arranged between the wall part and the first connecting part, a fourth recess is arranged on a side of the second insulating part facing the electrode body, the fourth recess is located on a side of the electrode lead-out hole along the first direction, and the first connecting part is at least partially arranged in the fourth recess.

23. The battery cell of claim 22, wherein, The tab is welded to the first connecting part to form a welded part, and the welded part is located in the fourth recess.

24. The battery cell of any one of claims 1 to 23, wherein, The shell comprises a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is located in the cavity, and the cover body covers the opening, and the cover body is configured as the wall part.

25. The battery cell of any one of claims 1 to 21, wherein, In the thickness direction, the size of the first recess is A, and 0.1mm≤A≤10mm.

26. The battery cell of claim 25, wherein, 0.5mm≤A≤6mm.

27. The battery cell of any one of claims 1 to 26, wherein, The battery monomer further comprises a transfer sheet, and the tab is connected to the first connecting part through the transfer sheet.

28. A battery device, characterized by The battery monomer comprises the battery monomer according to any one of claims 1 to 27.

29. An electrical device, comprising: The battery device comprises the battery device according to claim 28, and the battery device is used to provide electric energy.

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