Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, an electrode assembly of the battery monomer is accommodated in a shell, the electrode assembly comprises an electrode main body and a tab, one side, facing the electrode main body, of a wall part is provided with a first concave part, the first concave part is located on one side, along a first direction, of an electrode terminal, and the first direction is perpendicular to the thickness direction of the wall part; the tab extends from the electrode body toward an end portion of the wall portion, a portion of the tab is disposed in the first recess, and a portion of the tab extends from the first recess to be connected to the electrode terminal. The first concave part, facing the electrode main body, of the wall part is positioned on one side of the first direction of the electrode terminal, a part of the tab extending from the electrode main body to the wall part is arranged in the first concave part, a part of the tab extending from the first concave part is connected to the electrode terminal, and the tab is directly connected with the electrode terminal, so that the use of an adapter is reduced, and the cost is reduced. The internal resistance of the battery monomer is reduced, and the energy density of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] The battery device has the advantages of high specific energy and high power density, and is widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] With the continuous expansion of the application range of the battery device, people's requirements for various performances of the battery device are also getting higher and higher. How to reduce the internal resistance of the battery and improve the overcurrent capacity of the battery device is more and more concerned by the technical personnel in the field. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, the internal resistance of the battery monomer is small, and the battery monomer has good overcurrent capacity.

[0005] In the first aspect, some embodiments of the present application provide a battery monomer, which comprises a shell and an electrode assembly, the shell comprises a wall portion, and the wall portion is provided with an electrode terminal; the electrode assembly is accommodated in the shell, and the electrode assembly comprises an electrode main body and a tab, a first recess is arranged on a side of the wall portion facing the electrode main body, the first recess is located on one side of the electrode terminal along a first direction, and the first direction is perpendicular to a thickness direction of the wall portion; the tab extends from the electrode main body to an end portion of the wall portion, part of the tab is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal.

[0006] In the above structure, since the first recess of the wall portion facing the electrode main body is located on one side of the electrode terminal along the first direction, part of the tab extending from the electrode main body to the wall portion is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal, so that the tab can utilize the space of the first recess, the additional occupation of the tab to the space in the thickness direction is reduced, and more space can be left in the battery monomer to arrange the electrode main body, so as to improve the energy density of the battery monomer; the tab is directly connected to the electrode terminal, the use of the adapter is reduced, which is not only conducive to reducing the internal resistance of the battery monomer, but also conducive to improving the energy density of the battery monomer.

[0007] According to the battery monomer provided by some embodiments of the present application, the tab comprises a protruding structure and a bending structure connected to each other, the protruding structure extends to the wall portion along the thickness direction, and the bending structure is bent relative to the thickness direction, part of the bending structure is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal.

[0008] According to some embodiments of the present application, the battery cell includes a connection structure and a main body structure, the main body structure is connected to the extension structure and the connection structure, at least part of the main body structure is arranged in the first recess, the connection structure extends along the first direction, at least part of the connection structure extends out of the first recess, and the connection structure is connected to the electrode terminal.

[0009] According to some embodiments of the present application, the tab includes a plurality of tab layers, the tab layer includes an extension part, a main body part and a connection part, the main body part is connected between the extension part and the connection part, the extension parts of the plurality of tab layers are stacked to form the extension structure, the main body parts of adjacent tab layers are stacked in the thickness direction to form the main body structure, and the connection parts of adjacent tab layers are stacked in the thickness direction to form the connection structure.

[0010] According to some embodiments of the present application, the connection structure is welded to the surface of the electrode terminal facing the electrode main body.

[0011] According to some embodiments of the present application, the wall part includes a first region and a second region connected to each other, in the thickness direction, the distance between at least part of the first region and the electrode main body is greater than the distance between the second region and the electrode main body, the first recess is arranged in the first region, and the electrode terminal is arranged in the second region.

[0012] According to some embodiments of the present application, the first region and the second region are arranged along the first direction; in the 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.

[0013] According to some embodiments of the present application, a plurality of first regions are provided, and the second region is connected between two adjacent first regions.

[0014] According to some embodiments of the present application, a plurality of second regions are provided, the first region is connected between two adjacent second regions, and a plurality of electrode terminals are provided, and the plurality of electrode terminals are arranged in the plurality of second regions respectively.

[0015] According to some embodiments of the present application, the shell includes 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.

[0016] In the second aspect, some embodiments of the present application provide a battery device, which includes the battery cell provided in any of the technical solutions.

[0017] In the third aspect, some embodiments of the present application provide a power consumption device, which includes the battery device provided in the above technical solutions, and the battery device is used to provide electric energy.

[0018] The embodiments of the present disclosure provide at least the following beneficial effects:

[0019] Some embodiments of the present application provide a battery monomer, which comprises a shell and an electrode assembly, the shell comprises a wall part, and the wall part is provided with an electrode terminal; the electrode assembly is accommodated in the shell, and the electrode assembly comprises an electrode body and a tab, a first recess is arranged on a side of the wall part facing the electrode body, the first recess is located on one side of the electrode terminal in a first direction, and the first direction is perpendicular to the thickness direction of the wall part; the tab extends from the electrode body to the end of the wall part, part of the tab is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal. In the above structure, since the first recess of the wall part facing the electrode body is located on one side of the electrode terminal in the first direction, part of the tab extending from the electrode body to the wall part is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal, so that the tab can utilize the space of the first recess, reduce the additional occupation of the tab to the space in the thickness direction, and facilitate to leave more space in the battery monomer to arrange the electrode body, so as to improve the energy density of the battery monomer; the tab is directly connected to the electrode terminal, which reduces the use of the adapter, is beneficial to reducing the internal resistance of the battery monomer, and is also beneficial to improving the energy density of the battery monomer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are merely illustrative and are not considered to be limiting upon the present application. Throughout the drawings, like reference numerals are used to indicate like components.

[0021] Figure 1 A schematic view of a vehicle provided by some embodiments of the present application;

[0022] Figure 2 A split view of a battery device provided by some embodiments of the present application;

[0023] Figure 3 A split view of a battery monomer provided by some embodiments of the present application;

[0024] Figure 4 A sectional view of a battery monomer provided by some embodiments of the present application;

[0025] Figure 5 A Figure 4 An enlarged view at D in FIG. 8;

[0026] Figure 6 A structure schematic view of a tab layer in a tab of a battery monomer provided by some embodiments of the present application;

[0027] Figure 7A front view of an electrode assembly of a battery cell provided by some embodiments of the present application;

[0028] Figure 8 A front view of an electrode assembly of a battery cell provided by some embodiments of the present application.

[0029] In the drawings:

[0030] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 7, battery cell; 8, housing; 81, wall portion; 811, first region; 8111, first recess; 812, second region; 8121, second recess; 813, third region; 82, cover; 83, housing; 84, cavity; 9, electrode assembly; 91, electrode main body; 92, tab; 921, protruding structure; 922, bending structure; 9221, connecting structure; 9222, main body structure; 93, tab layer; 931, protruding portion; 932, main body portion; 933, connecting portion; 10, electrode terminal; X, thickness direction; Y, first direction; Z, second direction. DETAILED DESCRIPTION

[0031] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0033] In the description of the embodiments of the present application, the orientations or positional relationships indicated by 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" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0034] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0035] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in battery monomer of energy storage container or energy storage cabinet. With the continuous expansion of the application range of battery device, people's requirements for various performances of battery device are also getting higher and higher.

[0038] The battery device (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0039] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells.

[0040] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0041] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc.

[0042] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can function to prevent short circuiting between the positive electrode and the negative electrode while allowing the active ions to pass through.

[0043] The electrode assembly can be in a jellyroll structure, a stacked structure, or a hybrid structure of the jellyroll and the stacked structure.

[0044] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0045] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0046] In some embodiments, the battery device can include one or more battery packs, and the battery pack can include one or more battery cell assemblies. As an example, the battery pack includes a case and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the case, for example, by a fixing manner. As another example, the battery device includes a plurality of battery packs, and the plurality of battery packs can be connected in series, in parallel, or in a mixed manner.

[0047] As an example, the case can include a first case and a second case. The first case and the second case are fastened to each other, so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, the enclosed refers to covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0048] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0049] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0050] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0051] Currently, in order to facilitate the electrical connection between the electrode assembly and the electrode terminal, a relay is usually arranged in the battery monomer, the relay is arranged in the space between the electrode terminal and part of the electrode assembly, and the relay is welded with the tab of the electrode assembly and the electrode terminal. This not only makes the manufacturing process complex, but also increases the resistance of the battery monomer, and limits the improvement of the overcurrent capacity of the battery monomer.

[0052] In order to reduce the internal resistance of the battery monomer and improve the overcurrent capacity of the battery monomer, some embodiments of the present application provide a battery monomer, which comprises a shell and an electrode assembly, the shell comprises a wall portion, and the wall portion is provided with an electrode terminal; the electrode assembly is accommodated in the shell, and the electrode assembly comprises an electrode main body and a tab, a first recess is arranged on the side of the wall portion facing the electrode main body, the first recess is located on one side of the electrode terminal along a first direction, and the first direction is perpendicular to the thickness direction of the wall portion; the tab extends from the electrode main body towards the end portion of the wall portion, part of the tab is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal. In the above structure, since the first recess of the wall portion facing the electrode main body is located on one side of the electrode terminal along the first direction, part of the tab extending from the electrode main body towards the wall portion is arranged in the first recess, and part of the tab extends from the first recess and is connected to the electrode terminal, so that the tab can utilize the space of the first recess, and the additional occupation of the tab to the space in the thickness direction is reduced, which is beneficial to leaving more space in the battery monomer for arranging the electrode main body, so as to improve the energy density of the battery monomer; the tab is directly connected to the electrode terminal, which reduces the use of the relay, which is not only beneficial to reducing the internal resistance of the battery monomer, but also beneficial to improving the energy density of the battery monomer.

[0053] The battery monomer described in the embodiments of the present application is suitable for a battery device and a power consumption device using the battery device.

[0054] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0055] The following embodiments take a vehicle as an example for convenience of description.

[0056] Figure 1The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 7 are connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 7 can be accommodated in the case 5. Alternatively, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which can be accommodated in the case 5.

[0065] Some embodiments of the present application provide a battery cell 7, referring to Figures 3 to 4 the battery cell 7 includes a housing 8 and an electrode assembly 9. The housing 8 includes a wall portion 81 provided with an electrode terminal 10. The electrode assembly 9 is accommodated in the housing 8 and includes an electrode body 91 and a tab 92. A first recess 8111 is provided on a side of the wall portion 81 facing the electrode body 91 and is located on a side of the electrode terminal 10 in a first direction Y perpendicular to a thickness direction X of the wall portion 81. The tab 92 extends from an end of the electrode body 91 toward the wall portion 81, and a part of the tab 92 is disposed in the first recess 8111, and a part of the tab 92 extends from the first recess 8111 and is connected to the electrode terminal 10.

[0066] The housing 8 can be a component of the battery cell 7 for enclosing a sealed space and for accommodating other components of the battery cell 7. The wall portion 81 is a partial wall structure of the housing 8 for enclosing a sealed space in the housing 8.

[0067] The electrode assembly 9 is a component of the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 9 can be contained in the housing 8. The electrode body 91 and the tab 92 are two main parts of the electrode assembly 9. The tab 92 extends from an end of the electrode body 91 toward the wall portion 81, and the tab 92 is used to connect to the electrode terminal 10, so that the tab 92 can lead current out of or into the electrode assembly 9.

[0068] The electrode body 91 can include a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet can serve as a positive electrode and a negative electrode, respectively. During charging and discharging of the battery cell 7, active ions (e.g., lithium ions) are inserted into and extracted from the positive electrode and the negative electrode. The separator is disposed between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet, thereby preventing short circuiting of the positive electrode and the negative electrode while allowing the active ions to pass through.

[0069] The first recess 8111 can be a first recess 8111 structure provided on the wall portion 81. The wall portion 81 can be provided with the first recess 8111 on the side facing the electrode body 91, and can be that the side of the wall portion 81 facing the electrode body 91 is inwardly recessed to form the first recess 8111.

[0070] 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 the side of the electrode terminal 10 along the first direction Y, and can be that in the first direction Y, the projection of the first recess 8111 and the projection of the electrode terminal 10 overlap, so that the first recess 8111 and the electrode terminal 10 can occupy the same space in the thickness direction X.

[0071] The partial tab 92 is provided in the first recess 8111, and can be that a part of the tab 92 is provided in the first recess 8111, and the first recess 8111 serves as a space for accommodating the tab 92. By being provided on the side of the electrode terminal 10 along the first direction Y, the tab 92 and the electrode terminal 10 can share the space in the first direction Y, reducing the additional occupation of the tab 92 in the thickness direction X, and facilitating the battery monomer 7 to have more space for the electrode body 91 to be arranged, so as to improve the energy density of the battery monomer 7.

[0072] The partial tab 92 extends from the first recess 8111 and is connected to the electrode terminal 10, and can be that a part of the tab 92 extends from the first recess 8111, and the part extending from the first recess 8111 is connected to the electrode terminal 10, so that the tab 92 can be directly connected to the electrode terminal 10. By directly connecting the tab 92 to the electrode terminal 10, the use of the adapter is reduced, which not only facilitates the reduction of the internal resistance of the battery monomer 7, but also facilitates the improvement of the energy density of the battery monomer 7.

[0073] In the above structure, since the first recess 8111 of the wall portion 81 facing the electrode body 91 is located on the side of the electrode terminal 10 along the first direction Y, the part of the tab 92 extending from the electrode body 91 to the wall portion 81 is provided in the first recess 8111, and the part extending from the first recess 8111 is connected to the electrode terminal 10, so that the tab 92 can utilize the space of the first recess 8111, reducing the additional occupation of the tab 92 in the thickness direction X, and facilitating the battery monomer 7 to have more space for the electrode body 91 to be arranged, so as to improve the energy density of the battery monomer 7; by directly connecting the tab 92 to the electrode terminal 10, the use of the adapter is reduced, which not only facilitates the reduction of the internal resistance of the battery monomer 7, but also facilitates the improvement of the energy density of the battery monomer 7.

[0074] In some embodiments, continuing to refer to Figure 3 and Figure 5The tab 92 includes a protruding structure 921 and a bent structure 922 connected to each other, the protruding structure 921 extends to the wall portion 81 along the thickness direction X, and the bent structure 922 is bent relative to the thickness direction X, and part of the bent structure 922 is arranged in the first recess 8111, and part of the tab 92 protrudes from the first recess 8111 and is connected to the electrode terminal 10.

[0075] The protruding structure 921 and the bent structure 922 can be two different parts connected to each other in the tab 92, wherein the protruding structure 921 extends from the electrode body 91 to the wall portion 81 along the thickness direction X of the wall portion 81 and extends to the wall portion 81, and the bent structure 922 is bent relative to the thickness direction X to approach the electrode terminal 10 so as to be connected to the electrode terminal 10. By being bent relative to the thickness direction X, the bent structure 922 enables a larger surface of the tab 92 to face the electrode terminal 10, which is conducive to increasing the connection area of the tab 92 and the electrode terminal 10.

[0076] Part of the bent structure 922 is arranged in the first recess 8111, and part of the tab 92 protrudes from the first recess 8111. For example, part of the bent structure 922 is located in the first recess 8111, and part of the bent structure 922 protrudes from the first recess 8111 to one side of the electrode terminal 10 in the thickness direction X, so that the bent structure 922 protruding from the first recess 8111 can be connected to the electrode terminal 10. For example, the connection of the bent structure 922 and the electrode terminal 10 can be that the bent structure 922 is bonded to the electrode terminal 10 by conductive glue, or the bent structure 922 can be welded to the electrode terminal 10.

[0077] In some embodiments, the bent structure 922 includes a connecting structure 9221 and a body structure 9222, the body structure 9222 is connected to the protruding structure 921 and the connecting structure 9221, at least part of the body structure 9222 is arranged in the first recess 8111, the connecting structure 9221 extends along the first direction Y, at least part of the connecting structure 9221 protrudes from the first recess 8111, and the connecting structure 9221 is connected to the electrode terminal 10.

[0078] The connecting structure 9221 and the body structure 9222 can be two parts connected to each other in the bent structure 922, and the body structure 9222 is a main body part 932 in the bent structure 922 for connecting the protruding structure 921 and the connecting structure 9221.

[0079] At least part of the body structure 9222 is arranged in the first recess 8111. The body structure 9222 can be partially arranged in the first recess 8111 and partially arranged outside the first recess 8111. The part of the body structure 9222 arranged outside the first recess 8111 is connected to the extension structure 921, and the part of the body structure 9222 arranged in the first recess 8111 is connected to the connecting structure 9221. The entire body structure 9222 can be arranged in the first recess 8111, and the extension structure 921 extends into the first recess 8111 from the electrode body 91 and is connected to the body structure 9222 arranged in the first recess 8111.

[0080] The connecting structure 9221 extends along the first direction Y, so that at least part of the connecting structure 9221 extends from the first recess 8111 to the surface of the electrode terminal 10 facing the electrode body 91 along the first direction Y. At least part of the connecting structure 9221 extends from the first recess 8111. The part of the connecting structure 9221 extending from the first recess 8111 is connected to the electrode terminal 10, and the part of the connecting structure 9221 arranged in the first recess 8111 is connected to the body structure 9222.

[0081] In some embodiments, the tab 92 includes a plurality of tab layers 93, and the tab 92 is formed by stacking the plurality of tab layers 93. Figure 6 The tab layer 93 includes an extension portion 931, a body portion 932, and a connecting portion 933. The body portion 932 is connected between the extension portion 931 and the connecting portion 933. The extension portions 931 of the plurality of tab layers 93 are stacked to form the extension structure 921. The body portions 932 of adjacent tab layers 93 are stacked in the thickness direction X to form the body structure 9222. The connecting portions 933 of adjacent tab layers 93 are stacked in the thickness direction X to form the connecting structure 9221.

[0082] The tab layer 93 can be a portion of the electrode tab extending from the electrode body 91. The plurality of tab layers 93 are connected to form the tab 92 to be connected to the electrode terminal 10. The extension portion 931, the body portion 932, and the connecting portion 933 can be three portions of the tab layer 93. The body portion 932 can be a portion for connecting the extension portion 931 and the connecting portion 933. The extension portion 931 extends from the electrode body 91 along the thickness direction X. The body portion 932 and the connecting portion 933 are bent relative to the thickness direction X to approach the electrode terminal 10.

[0083] The extension portions 931 of the plurality of tab layers 93 are stacked to form the extension structure 921 of the tab 92. The plurality of tab layers 93 are stacked such that the body portions 932 of adjacent tab layers 93 can be stacked in the thickness direction X to form the body structure 9222. The plurality of tab layers 93 are stacked such that the connecting portions 933 of adjacent tab layers 93 can be stacked in the thickness direction X to form the connecting structure 9221.

[0084] Exemplarily, the plurality of tab layers 93 are connected by ultrasonic welding after being stacked, so that the tab 92 formed by the plurality of tab layers 93 has good overall structural strength to be connected with the electrode terminal 10.

[0085] In some embodiments, the connecting structure 9221 is welded to the surface of the electrode terminal 10 facing the electrode body 91.

[0086] By welding the connecting structure 9221 to the surface of the electrode terminal 10 facing the electrode body 91, the material of the connecting structure 9221 can be melted together with the material of the electrode terminal 10, not only making the tab 92 firmly connected to the electrode terminal 10, but also reducing the resistance at the connection between the tab 92 and the electrode terminal 10, which is conducive to improving the overcurrent capacity of the battery monomer 7.

[0087] In some embodiments, the wall portion 81 includes a first region 811 and a second region 812 connected to each other, at least part of the first region 811 has a larger distance from the electrode body 91 than the second region 812 in the thickness direction X, the first recess 8111 is arranged in the first region 811, and the electrode terminal 10 is arranged in the second region 812.

[0088] The first region 811 and the second region 812 are two parts connected to each other in the wall portion 81. In the thickness direction X, the first region 811 has a larger distance from the electrode body 91 than the second region 812, which means that in the thickness direction X, the first region 811 is farther away from the electrode body 91 than the second region 812, so that the first region 811 is recessed away from the electrode body 91 compared with the second region 812, so that the first region 811 can correspond to the bottom surface of the first recess 8111, so that the first recess 8111 is arranged in the first region 811.

[0089] By arranging the electrode terminal 10 in the second region 812, the electrode terminal 10 and the first recess 8111 are arranged in different parts of the wall portion 81, which facilitates the arrangement of different structures on the wall portion 81.

[0090] In some embodiments, the first region 811 and the second region 812 are arranged along a first direction Y; along a 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.

[0091] 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 terminal 10 located in the second region 812 can be arranged along the first direction Y, so that the first recess 8111 is located on one side of the electrode terminal 10 along the first direction Y.

[0092] By setting the second direction Z as perpendicular to the first direction Y and the thickness direction X of the wall portion 81, the thickness direction X, the first direction Y and the second direction Z of the wall portion 81 are perpendicular to each other. By setting the size of the first recess portion 8111 along the second direction Z and the size of the second region 812 along the second direction Z as equal, the first recess portion 8111 can better accommodate the tab 92, which helps to save the additional space of the tab 92 in the thickness direction X.

[0093] In some embodiments, the second region 812 is provided with a second recess portion 8121 on the side away from the electrode body 91, and the partial electrode terminal 10 is located in the second recess portion 8121.

[0094] The second recess portion 8121 can be a recess structure provided on the second region 812 and recessed inward from the side of the second region 812 away from the electrode body 91. By accommodating the partial electrode terminal 10 in the second recess portion 8121, not only can the size of the electrode terminal 10 protruding outward from the shell 8 be reduced, but also the compactness of the battery monomer 7 structure can be improved.

[0095] In some embodiments, the wall portion 81 further comprises a third region 813, the third region 813 being connected between the first region 811 and the second region 812, and the third region 813 being bent towards the second region 812 relative to the first region 811.

[0096] The third region 813 can be a part of the wall portion 81 for connecting the first region 811 and the second region 812. By being connected between the first region 811 and the second region 812 and being bent towards the second region 812 relative to the first region 811, the second region 812 of the wall portion 81 can be formed with the first recess portion 8111 by stamping, so that the wall portion 81 is conveniently formed.

[0097] In some embodiments, the end surface 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 surface 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.

[0098] By making the end surface 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, or making the end surface 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 portion 8121, so that the electrode terminal 10 will not additionally occupy the size of the battery monomer 7 in the thickness direction X, and the possibility of wasted space of the electrode terminal 10 is reduced.

[0099] In some embodiments, the first region 811 is provided in plurality, and the second region 812 is connected between two adjacent first regions 811.

[0100] By providing the first region 811 in plurality and connecting the second region 812 between two adjacent first regions 811, the second region 812 recessed inward from the outside of the battery cell 7 is located in the middle of the wall portion 81, so that the wall portion 81 is recessed in the middle.

[0101] In some embodiments, the electrode terminal 10 is provided in plurality, and the plurality of electrode terminals 10 are arranged at intervals in the second region 812. By arranging the plurality of electrode terminals 10 at intervals in the second region 812, electrode terminals 10 of different polarities can be arranged on the wall portion 81, and electrode terminals 10 of different polarities can be arranged at the same end of the battery cell 7.

[0102] For example, the first region 811 is provided in two, the second region 812 is provided in one, the second region 812 is connected between the two first regions 811, and the electrode terminal 10 is provided in two of opposite polarities, and the two electrode terminals 10 of opposite polarities are arranged at intervals in the first region 811. At this time, referring to Figure 7 , the two tabs 92 of opposite polarities are arranged opposite to each other in the first direction Y, and the connection structures 9221 of the two tabs 92 extend close to each other to extend to the electrode terminal 10 located in the second region 812.

[0103] In some embodiments, the second region 812 is provided in plurality at intervals, the first region 811 is connected between two adjacent second regions 812, and the electrode terminal 10 is provided in plurality, and the plurality of electrode terminals 10 are arranged in the plurality of second regions 812, respectively.

[0104] By providing the second region 812 in plurality and connecting the first region 811 between two adjacent second regions 812, the second region 812 recessed inward from the outside of the battery cell 7 is located in the side portion of the wall portion 81, so that the wall portion 81 is recessed in the side.

[0105] The plurality of electrode terminals 10 are arranged in the plurality of second regions 812, respectively, which can be that the number of electrode terminals 10 is equal to the number of second regions 812, and the electrode terminals 10 are arranged one by one in the second regions 812, so that electrode terminals 10 of different polarities can be arranged at intervals at the same end of the battery cell 7.

[0106] For example, the second region 812 is provided in two, the first region 811 is provided in one, the first region 811 is connected between the two second regions 812, and the electrode terminal 10 is provided in two of opposite polarities, and the two electrode terminals 10 of opposite polarities are arranged in the two second regions 812, respectively. At this time, referring to Figure 8The two polar tabs 92 with opposite polarity are arranged opposite to each other along the first direction Y, and the connecting structures 9221 of the two polar tabs 92 extend away from each other to extend to the electrode terminal 10 located at the second area 812.

[0107] In some embodiments, the shell 8 includes a housing 83 and a cover 82, the housing 83 forms a cavity 84 with an opening, the electrode assembly 9 is located in the cavity 84, and the cover 82 covers the opening, and the cover 82 is configured as the wall portion 81.

[0108] The housing 83 and the cover 82 are two parts connected to each other in the shell 8, wherein the housing 83 surrounds the cavity 84 with an open end, so that the components such as the electrode assembly 9 can be conveniently loaded into the cavity 84 from the opening; the cover 82 can be a part for sealing the opening, which is sealed to the housing 83 to form a sealed space in the cavity 84. By configuring the cover 82 as the wall portion 81, the electrode terminal 10 is arranged on the cover 82, and since the cover 82 has a smaller size compared to the housing 83, the electrode terminal 10 can be more conveniently arranged on the cover 82.

[0109] Some embodiments of the present application also provide a battery device 2, which includes the battery cell 7 provided in the above technical solutions.

[0110] Some embodiments of the present application also provide a power utilization device, which includes the battery device 2 provided in the above technical solutions, and the battery device 2 is used to provide electric energy.

[0111] Some embodiments of the present application provide a battery cell 7, which includes a shell 8 and an electrode assembly 9, a wall portion 81 of the shell 8 is provided with an electrode terminal 10, the electrode assembly 9 is accommodated in the shell 8, the electrode assembly 9 includes an electrode body 91 and a polar tab 92, a first recess 8111 is arranged on a side of the wall portion 81 facing the electrode body 91, the first recess 8111 is located on one side of the electrode terminal 10 along a first direction Y, and the first direction Y is perpendicular to a thickness direction X of the wall portion 81; the polar tab 92 includes an extending structure 921, a connecting structure 9221, and a main body structure 9222, the extending structure 921 extends to the wall portion 81 along the thickness direction X, the main body structure 9222 is connected to the extending structure 921 and the connecting structure 9221, the connecting structure 9221 and the main body structure 9222 are bent relative to the thickness direction X and located in the first recess 8111, the connecting structure 9221 extends along the first direction Y, and at least part of the connecting structure 9221 extends from the first recess 8111 and is welded to a surface of the electrode terminal 10 facing the electrode body 91.

[0112] In the above structure, since the first recess portion 8111 of the wall portion 81 facing the electrode body 91 is located on the first direction Y side of the electrode terminal 10, the portion of the tab 92 extending from the electrode body 91 to the wall portion 81 is arranged in the first recess portion 8111, and the portion extending from the first recess portion 8111 is connected to the electrode terminal 10, so that the tab 92 can use the space of the first recess portion 8111, reducing the extra space occupied by the tab 92 in the thickness direction X, which is conducive to leaving more space in the battery monomer 7 to arrange the electrode body 91, so as to improve the energy density of the battery monomer 7; the tab 92 is connected directly to the electrode terminal 10, reducing the use of adapters, which is not only conducive to reducing the internal resistance of the battery monomer 7, but also conducive to improving the energy density of the battery monomer 7.

[0113] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing comprising a wall portion provided with an electrode terminal; an electrode assembly accommodated in the housing, the electrode assembly comprising an electrode body and a tab, the wall portion being provided with a first recess on a side facing the electrode body, the first recess being located on a side of the electrode terminal along a first direction, the first direction being perpendicular to a thickness direction of the wall portion; the tab extending from the electrode body towards an end portion of the wall portion, part of the tab being provided in the first recess and part of the tab extending out of the first recess and being connected to the electrode terminal.

2. The battery cell of claim 1, wherein, The tab comprises a protruding structure and a bent structure connected to each other, the protruding structure extending along the thickness direction towards the wall portion, and the bent structure being bent relative to the thickness direction, part of the bent structure being provided in the first recess and part of the tab extending out of the first recess and being connected to the electrode terminal.

3. The battery cell of claim 2, wherein, The bent structure comprises a connecting structure and a main body structure, the main body structure being connected to the protruding structure and the connecting structure, at least part of the main body structure being provided in the first recess, the connecting structure extending along the first direction, at least part of the connecting structure extending out of the first recess, and the connecting structure being connected to the electrode terminal.

4. The battery cell of claim 3, wherein, The tab comprises a plurality of tab layers, each of the tab layers comprising a protruding portion, a main body portion and a connecting portion, the main body portion being connected between the protruding portion and the connecting portion, the protruding portions of the plurality of tab layers being stacked to form the protruding structure, the main body portions of adjacent tab layers being stacked in the thickness direction to form the main body structure, and the connecting portions of adjacent tab layers being stacked in the thickness direction to form the connecting structure.

5. The battery cell of claim 3, wherein, The connecting structure is welded to a surface of the electrode terminal facing the electrode body.

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, at least part of the first region has a larger distance to the electrode body than the second region, the first recess is provided in the first region, and the electrode terminal is provided in the second region.

7. The battery cell of claim 6, wherein, The first region and the second region are arranged along the first direction; along a second direction, the first recess has a same size as the second region, the second direction being perpendicular to the first direction and the thickness direction.

8. The battery cell of claim 6, wherein, The first region is provided in a plurality, and the second region is connected between adjacent two of the first regions.

9. The battery cell of claim 6, wherein, The second region is provided in a plurality, the first region is connected between adjacent two of the second regions, and the electrode terminal is provided in a plurality, each of the plurality of electrode terminals being provided in a corresponding one of the plurality of second regions.

10. The battery cell of claim 1, wherein, The housing comprises a housing body and a cover body, the housing body forms a cavity having an opening, the electrode assembly is located in the cavity, and the cover body covers the opening, the cover body being configured as the wall portion.

11. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1 to 10.

12. An electrical device, characterized by The battery device according to claim 11 is configured to provide electrical energy.

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