Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device. The battery monomer comprises an electrode assembly, a shell and an electrode terminal. The electrode assembly comprises an electrode body and a tab. The tab is led out from an end of the electrode body along a first direction. The shell has a containing cavity. The electrode assembly is contained in the containing cavity. The shell has a first wall. The first wall is located on a side of the tab away from the electrode body. The first wall has a recess recessed to the containing cavity along the first direction. The containing cavity has a first subspace. Along a second direction, the first subspace is located on at least one side of the recess. The second direction intersects the first direction. At least part of the tab is contained in the first subspace. The electrode terminal is used for electrically connecting with the tab and is at least partially contained in the recess. The battery monomer provided by the embodiments of the application can improve the energy density of the battery monomer.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Individual battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and rechargeable alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, besides improving the performance of individual battery cells, how to increase the energy density of batteries is also an issue that cannot be ignored. Therefore, how to improve the energy density of individual battery cells is a technical problem that requires continuous improvement in battery cell technology. Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device that can improve the energy density of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell including an electrode assembly, a housing, and electrode terminals; the electrode assembly includes an electrode body and a tab, the tab being extended from an end of the electrode body along a first direction; the housing has a receiving cavity, the electrode assembly being received within the receiving cavity; the housing has a first wall, the first wall being located on the side of the tab facing away from the electrode body, and the first wall having a recess recessed into the receiving cavity along the first direction, the receiving cavity having a first subspace, the first subspace being located on at least one side of the recess along a second direction, the second direction intersecting the first direction, at least a portion of the tab being received within the first subspace; the electrode terminals are used for electrical connection with the tab and are at least partially received within the recess.

[0006] The battery cell provided in this application embodiment, by setting a first subspace, transfers the space of at least one side of the external electrode terminal of the battery cell along the second direction to the inside of the battery cell, and accommodates at least a portion of the tab in the first subspace. This is beneficial to reduce the space occupied by the tab in the inside of the battery cell along the first direction. The space saved by setting at least a portion of the tab in the first sub-hole can be used to accommodate the electrode body, which can increase the size of the electrode body along the first direction. This is beneficial to increase the capacity of the battery cell and thus increase the energy density of the battery cell.

[0007] In some embodiments, along the first direction, the depth h1 of the recess satisfies: h1 ≥ 2.5 mm. This facilitates accommodating as much of the tab as possible within the first subspace, reducing the space occupied by the tab within the battery cell along one direction, and further increasing the dimensions of the electrode body along the first direction to maximize the capacity of the battery cell, thereby increasing the energy density of the battery cell.

[0008] In some embodiments, along the first direction, the distance h2 between the electrode body and the bottom wall of the recess satisfies: h2 ≤ 3 mm. This allows the tabs to be located as much as possible within the first subspace, which is beneficial for increasing the dimensions of the electrode body along the first direction, thereby increasing the capacity and energy density of the battery cell.

[0009] In some embodiments, the electrode terminal is disposed on the bottom wall of the recess, and the end face of the electrode terminal facing away from the receiving cavity is located inside the recess.

[0010] This design allows for full utilization of the extra space occupied by the electrode terminals on the exterior of the battery cell, enabling as many tabs as possible to be located within the first sub-space along the first direction, thus maximizing the size of the electrode body along the first direction and improving the capacity and energy density of the battery cell. Furthermore, since the electrode terminals are entirely located within the recess, the risk of them becoming loose due to friction is reduced. When the battery cell is subjected to impacts or vibrations, these loads are absorbed by the area corresponding to the first wall and the outer casing, rather than being transmitted to the electrode terminals. This reduces the vibration and impact loads on the electrode terminals, maintaining the stability of the electrode terminal structure.

[0011] In some embodiments, the housing includes a shell and an end cap, the end cap fitting onto the shell to form a receiving cavity, and a first wall being at least a portion of the end cap. This configuration helps to reduce the processing difficulty of the first wall and also reduces the complexity of the battery cell assembly process.

[0012] In some embodiments, the recess extends through the battery cell along a third direction, and the first direction, the second direction, and the third direction intersect each other. During the connection of the electrode terminals of two adjacent battery cells via a busbar, the busbar passes through the recesses of the two adjacent battery cells without interfering with other components, which helps improve the overall structural stability of the battery.

[0013] In some embodiments, along the first direction, the depth h1 of the recess satisfies: h1 ≥ 6.5 mm. Thus, the recess has sufficient space to accommodate the busbar and electrode terminals, meaning the busbar and electrode terminals are completely located inside the recess. The first wall provides some protection for the busbar and electrode terminals, reducing the risk of the busbar failing to connect to the electrode terminals due to friction from other components. When the battery cell is subjected to impacts, vibrations, or other loads, the impacts and vibrations are less likely to be transmitted to the busbar and battery terminals, thus further improving the stability of the battery's internal structure.

[0014] In some embodiments, the two first subspaces are located on both sides of the recess along the second direction. This facilitates the rational setting of the number and arrangement of electrode components inside the battery cell according to actual needs.

[0015] In some embodiments, the electrode body has two first surfaces disposed opposite to each other along a second direction and two second surfaces disposed opposite to each other along a third direction. The first surfaces connect the two second surfaces, and the area of ​​the first surface is larger than the area of ​​the second surface. The battery cell includes multiple electrode assemblies arranged along the second direction. Since the area of ​​the first surface is larger than the area of ​​the second surface, the dimension of the electrode assembly along the third direction is larger than the dimension along the second direction. The two tabs of opposite polarities of the electrode assembly can be spaced apart along the third direction. Arranging multiple electrode assemblies along the second direction is beneficial for achieving electrical connection of tabs of the same polarity in different electrode assemblies.

[0016] In some embodiments, the electrode body has two first surfaces disposed opposite to each other along a second direction and two second surfaces disposed opposite to each other along a third direction, the first surfaces connecting the two second surfaces, and the area of ​​the first surface being smaller than the area of ​​the second surface; the battery cell includes a plurality of electrode assemblies, the plurality of electrode assemblies being arranged along a third direction.

[0017] In the above embodiments, since the area of ​​the first surface is smaller than the area of ​​the second surface, the dimension of the electrode assembly along the third direction is smaller than the dimension along the second direction. Two tabs with opposite polarities on the electrode assembly can be spaced apart along the second direction. Arranging multiple electrode assemblies along the third direction facilitates the electrical connection of tabs with the same polarity from different electrode assemblies.

[0018] In some embodiments, the two recesses are located on both sides of the first subspace along the second direction. By setting the two recesses on both sides of the first subspace along the second direction, it is convenient to reasonably set the number and arrangement of the electrode components inside the battery cell according to actual needs.

[0019] In some embodiments, the electrode body has two first surfaces disposed opposite each other along a second direction and two second surfaces disposed opposite each other along a third direction, the first surfaces connecting the two second surfaces, and the surface area of ​​the first surface being smaller than the surface area of ​​the second surface; the battery cell includes multiple electrode assemblies arranged along a third direction. Therefore, arranging multiple electrode assemblies along a third direction is beneficial for achieving electrical connection of tabs with the same polarity for different electrode assemblies.

[0020] In some embodiments, the battery cell includes two electrode terminals, with one electrode terminal located within a recess. Since the two tabs of opposite polarity of the electrode assembly are spaced apart along a second direction within the first subspace, placing the electrode terminals on both sides of the first subspace along the second direction facilitates electrical connection between the electrode terminals and their corresponding tabs.

[0021] In some embodiments, the battery cell further includes a current collector that connects the electrode terminals and the tabs. Connecting the electrode terminals and tabs via a current collector helps reduce the difficulty of connecting the electrode terminals and tabs.

[0022] In some embodiments, the current collector includes a first connecting portion, a second connecting portion, and a bent portion. The first connecting portion is connected to the electrode terminal, the second connecting portion is located within a first subspace and connected to the tab, and the bent portion connects the first connecting portion and the second connecting portion. This arrangement further facilitates the electrical connection between the electrode terminal and the tab.

[0023] In some embodiments, the current collector includes two second connecting portions and two bent portions. The two second connecting portions are located on both sides of the first connecting portion, and the two bent portions are respectively connected to the two ends of the first connecting portion and the second connecting portion. This facilitates the electrical connection between the electrode terminal and the tabs of the same polarity located on both sides of the electrode terminal.

[0024] Secondly, embodiments of this application provide a battery, including a battery cell as described in any embodiment of the first aspect.

[0025] The battery provided according to the embodiments of this application has the same technical effect because it uses the battery cell provided in any of the above embodiments, and will not be described again here.

[0026] In some embodiments, the battery further includes a busbar that connects to the electrode terminals of adjacent battery cells and is located within a recess.

[0027] Thus, when the battery is subjected to loads such as impacts and vibrations, these loads are borne by the first wall of the battery cell, making it less likely to be transmitted to the busbar and electrode terminals, which helps improve the stability of the battery's internal structure. Furthermore, because the busbar is located within a recess, the risk of other components scratching the busbar and causing connection failure between the busbar and electrode terminals is reduced.

[0028] Thirdly, embodiments of this application provide an electrical device, including a battery as described in the second aspect embodiment, the battery being used to provide electrical energy.

[0029] The electrical device provided according to the embodiments of this application has the same technical effect as the battery provided in the embodiments of this application, and will not be described again here. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0031] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0032] Figure 2 is a schematic diagram of an explosion of a battery provided in an embodiment of this application;

[0033] Figure 3 is a magnified view of part A in Figure 2;

[0034] Figure 4 is a schematic diagram of the explosion of a single battery cell in the battery shown in Figure 2;

[0035] Figure 5 is a front view of a single battery cell in the battery shown in Figure 2;

[0036] Figure 6 is a schematic diagram of the cross-sectional structure along BB in Figure 5;

[0037] Figure 7 is a schematic diagram of an explosion of a battery provided in another embodiment of this application;

[0038] Figure 8 is a magnified view of part M in Figure 7;

[0039] Figure 9 is a schematic diagram of the explosion of a single cell in the battery shown in Figure 7;

[0040] Figure 10 is a front view of a single battery cell in the battery shown in Figure 7;

[0041] Figure 11 is a schematic diagram of the cross-sectional structure along NN in Figure 10;

[0042] Figure 12 is a schematic diagram of an explosion of a battery according to another embodiment of this application;

[0043] Figure 13 shows a magnified view of point C in Figure 12;

[0044] Figure 14 is a schematic diagram of the explosion of a single cell in the battery shown in Figure 12;

[0045] Figure 15 is a front view of a single cell in the battery shown in Figure 12;

[0046] Figure 16 is a schematic cross-sectional view of the structure along DD in Figure 15.

[0047] The accompanying drawings are not drawn to scale.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Vehicle; 1a. Motor; 1b. Controller;

[0050] 10. Battery; 11. First housing section; 12. Second housing section;

[0051] 20. Battery module;

[0052] 30. Battery cell; 31. Housing; 31a. Receiving cavity; 31b. First subspace; 311. Shell; 311a. Opening; 312. End cap; 313. First wall; 313a. Recess; 32. Electrode assembly; 321. Electrode body; 321a. First surface; 321b. Second surface; 322. Tab; 33. Electrode terminal; 34. Current collector; 341. First connecting part; 342. Second connecting part; 343. Bending part;

[0053] 40. Busbar;

[0054] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0057] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, C and / or D can represent: C existing alone, C and D existing simultaneously, or D existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0061] In this application, "multiple" means two or more (including two).

[0062] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.

[0063] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0064] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, with the active material layer coated on the surface of the current collector. The current collector includes a current-collecting portion and a positive convex portion protruding from the current-collecting portion. The current-collecting portion is coated with the active material layer, while at least a portion of the positive convex portion is not coated with the active material layer; the positive convex portion serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the active material layer includes the active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection portion and a negative current protrusion protruding from the negative current collection portion. The negative current collection portion is coated with the negative active material layer, and at least a portion of the negative current protrusion is not coated with the negative active material layer; the negative current protrusion serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0065] After discovering the problem of low energy density in battery cells, the inventors systematically analyzed and studied the structure and assembly process of battery cells. They found that in related technologies, the electrode terminals of battery cells are usually set to protrude from the first wall, which is usually a flat wall. As a result, the electrode terminals occupy the space along the thickness direction of the first wall on the outside of the battery cell. After the battery cells are assembled into a battery, part of the space along the thickness direction of the first wall inside the battery cannot be used, resulting in a certain amount of space waste. Inside the battery cell, the tabs have a certain height relative to the electrode body, and part of the space along the height direction of the tabs inside the battery cell cannot be used reasonably. Thus, to a certain extent, this limits the improvement of the energy density of battery cells.

[0066] Based on the problems discovered by the inventors, the inventors have improved the structure of the battery cell. The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0067] The battery cell provided according to an embodiment of this application includes an electrode assembly, a housing, and electrode terminals. The electrode assembly includes an electrode body and a tab, the tab extending from an end of the electrode body along a first direction. The housing has a receiving cavity in which the electrode assembly is received. The housing has a first wall located on the side of the tab facing away from the electrode body, and the first wall has a recess recessed into the receiving cavity along the first direction. The receiving cavity has a first subspace located on at least one side of the recess along a second direction, the second direction intersecting the first direction, and at least a portion of the tab is received within the first subspace. At least a portion of the electrode terminal is received within the recess and is used for electrical connection with the tab.

[0068] The battery cell provided in this application embodiment has a recess in its first wall, and a first sub-space is provided on at least one side of the recess to house at least a portion of the electrode terminal and at least a portion of the tab. This transfers the space outside the battery cell occupied by the electrode terminal to the first sub-space inside the battery cell to accommodate at least a portion of the tab. This transfers unused space outside the battery cell to the interior of the battery cell to accommodate at least a portion of the tab, which is beneficial for increasing the dimension of the electrode body along the first direction, i.e., increasing the capacity of the battery cell, and thus increasing the energy density of the battery cell.

[0069] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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. This application does not impose any special limitations on the above-mentioned electrical devices.

[0070] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0071] As shown in Figure 1, a battery 10 is installed inside the vehicle 1. The battery 10 can be located at the bottom, front, or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1; for example, the battery 10 can serve as the operating power source for the vehicle 1.

[0072] Vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0073] In some embodiments of this application, the battery 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0074] Figure 2 shows a schematic diagram of the exploded structure of a battery provided in an embodiment of this application, and Figure 3 shows a partial enlarged view of point A in Figure 2.

[0075] Referring to Figures 2 and 3, the battery 10 includes a battery cell 30. The battery 10 may also include a housing for accommodating the battery cell 30.

[0076] The housing is used to house the battery cell 30, and the housing can have various structural forms. In some embodiments, the housing may include a first housing portion 11 and a second housing portion 12. The first housing portion 11 and the second housing portion 12 cover each other. The first housing portion 11 and the second housing portion 12 together define a receiving space for accommodating the battery cell. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing with a receiving space; alternatively, both the first housing portion 11 and the second housing portion 12 may be hollow structures with one side open. The open side of the first housing portion 11 covers the open side of the second housing portion 12 to form a housing with a receiving space. Of course, the first housing portion 11 and the second housing portion 12 can be various shapes, such as cylinders, cuboids, etc.

[0077] To improve the sealing performance after the first housing part 11 and the second housing part 12 are connected, a sealing element, such as sealant or sealing ring, can be provided between the first housing part 11 and the second housing part 12.

[0078] Assuming that the first box part 11 covers the second box part 12, the first box part 11 can also be called the upper box cover, and the second box part 12 can also be called the lower box.

[0079] In battery 10, there can be one or more battery cells 30. If there are multiple battery cells 30, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 30 are connected in both series and parallel. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed configuration and then housed in a housing. Alternatively, multiple battery cells 30 can first be connected in series, parallel, or in a mixed configuration to form a battery module 20. Multiple battery modules 20 can then be connected in series, parallel, or in a mixed configuration to form a whole and housed in a housing.

[0080] In some embodiments, the battery module 20 comprises multiple battery cells 30. These multiple battery cells 30 are first connected in series, parallel, or in a mixed configuration to form the battery module 20. The multiple battery modules 20 are then connected in series, parallel, or in a mixed configuration to form a whole, which is housed within a casing.

[0081] In some embodiments, multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery module 20.

[0082] Please refer to Figure 4, which is an exploded view of the battery cell 30 shown in Figure 3. The battery cell 30 provided in this embodiment includes an electrode assembly 32 and a housing 31. The housing 31 has a receiving cavity 31a, in which the electrode assembly 32 is received.

[0083] In some embodiments, the housing 31 may include a housing 311 and an end cap 312. The housing 311 is a hollow structure with an opening on one side, and the end cap 312 covers the opening 311a of the housing 311 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.

[0084] When assembling the battery cell 30, the electrode assembly 32 can be placed into the housing 311 first, and then the end cap 312 can be closed on the opening of the housing 311. Then, the electrolyte can be injected into the housing 311 through the electrolyte injection port on the end cap 312.

[0085] In some embodiments, the housing 31 may also be used to contain an electrolyte, such as an electrolyte solution. The housing 31 may have various structural forms.

[0086] The housing 311 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 311 can be determined based on the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 is a cylindrical structure, the housing 311 can be a cylindrical structure. If the electrode assembly 32 is a cuboid structure, the housing 311 can be a cuboid structure. In Figure 4, exemplarily, both the housing 311 and the electrode assembly 32 are cuboid structures.

[0087] The material of the housing 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and this application embodiment does not impose any special restrictions on it.

[0088] The electrode assembly 32 housed within the housing 311 can be one or more. In Figure 4, there are two electrode assemblies 32 housed within the housing 311.

[0089] Figure 5 is a front view of the battery cell shown in Figure 4; Figure 6 is a cross-sectional view of Figure 5 along the BB axis.

[0090] As shown in Figures 4 to 6, the battery cell 30 provided according to an embodiment of this application includes an electrode assembly 32, a housing 31, and electrode terminals 33. The electrode assembly 32 includes an electrode body 321 and a tab 322, the tab 322 extending from the end of the electrode body 321 along a first direction X. The housing 31 has a receiving cavity 31a, within which the electrode assembly 32 is received. The housing 31 has a first wall 313 located on the side of the tab 322 facing away from the electrode body 321, and the first wall 313 has a recess 313a recessed into the receiving cavity 31a along the first direction X. The receiving cavity 31a has a first subspace 31b, located on at least one side of the recess 313a along a second direction Y, the second direction Y intersecting the first direction X. At least a portion of the tab 322 is received within the first subspace 31b. The electrode terminal 33 is at least partially received within the recess 313a and is used for electrical connection with the tab 322.

[0091] The electrode body 321 corresponds to the part of the electrode sheet coated with the active material layer. Its size reflects the capacity of the battery cell 30. Under the condition that other parameters remain unchanged, the larger the size of the electrode body 321, the larger the capacity of the corresponding battery cell 30.

[0092] Optionally, the electrode assembly 32 may include one tab 322, or the electrode assembly 32 may include two tabs 322.

[0093] In an embodiment where the electrode assembly 32 includes two tabs 322, the two tabs 322 may be led out from one end of the electrode body 321 along the first direction X, or the two tabs 322 may be led out from both ends of the electrode body 321 along the first direction X.

[0094] In an embodiment where the tab 322 extends from one end of the electrode body 321 along the first direction X, the housing 31 includes a first wall 313. In an embodiment where the tab 322 extends from both ends of the electrode body 321 along the first direction X, the housing 31 may include one first wall 313, and the first wall 313 is located on the side of either tab 322 facing away from the electrode body 321. Alternatively, the housing 31 may include two first walls 313, each located on the side of one tab 322 facing away from the electrode body 321.

[0095] If the recess 313a is recessed into the receiving cavity 31a along the first direction X, then the periphery of the recess 313a perpendicular to the first direction X can be surrounded by the first wall 313. Alternatively, the portion of the recess 313a perpendicular to the first direction X may be provided with the first wall 313. In other words, the recess 313a may be provided through the first wall 313 along any one or more directions perpendicular to the first direction X. That is, the recess 313a may be provided in the region near the middle of the first wall 313, or the recess 313a may be provided in the region near the edge of the first wall 313.

[0096] The first subspace 31b is located on at least one side of the recess 313a along the second direction Y, and the first subspace 31b and the recess 313a are arranged side by side along the second direction Y. In other words, a protrusion is formed in the area corresponding to the first wall 313 and the first subspace 31b, the protrusion and the recess 313a are arranged side by side along the second direction Y, and the area corresponding to the first wall 313 and the protrusion forms the first subspace 31b.

[0097] Optionally, the first wall 313 may have a recess 313a and the receiving cavity 31a may have a first subspace 31b; or, the first wall 313 may have a recess 313a and the receiving cavity 31a may have two first subspaces 31b, with the two first subspaces 31b located on both sides of the recess 313a along the second direction Y; or, the first wall 313 may have a recess 313a and the receiving cavity 31a may have two first subspaces 31b, with the two first subspaces 31b located on both sides of the recess 313a along the second direction Y.

[0098] It should be noted that the second direction Y can be one direction intersecting with the first direction X, or it can be two directions intersecting with the second direction Y. For example, the first subspace 31b is located on at least one side of any two directions that the recess 313a intersects with the first direction X.

[0099] If a first direction X intersects with a second direction Y, the angle between the first direction X and the second direction Y can be an acute angle, a right angle, or an obtuse angle, etc. For example, the first direction X and the second direction Y can be perpendicular to each other.

[0100] At least a portion of the tab 322 is contained within the first subspace 31b. Therefore, it is possible to configure a portion of the tab 322 to be contained within the first subspace 31b, or to configure the tab 322 to be contained entirely within the first subspace 31b, depending on the actual situation.

[0101] The electrode terminal 33 and the electrode tab 322 can be directly electrically connected, or the electrode terminal 33 and the electrode tab 322 can be electrically connected through an intermediate conductive element.

[0102] The electrode terminal 33 is at least partially accommodated within the recess 313a. Alternatively, the electrode terminal 33 may be partially accommodated within the recess 313a, or it may be configured to be entirely accommodated within the recess 313a. The choice can be made based on the actual situation.

[0103] Optionally, the end face of the electrode terminal 33 facing away from the first wall 313 may be located outside the recess 313a, or the end face of the electrode terminal 33 facing away from the first wall 313 may be located inside the recess 313a.

[0104] The battery cell 30 provided in this application embodiment, by setting a first subspace 31b, transfers the space of at least one side of the external electrode terminal 33 of the battery cell 30 along the second direction Y to the inside of the battery cell 30, and accommodates at least a portion of the tab 322 in the first subspace 31b. This is beneficial to reduce the space occupied by the tab 322 in the inside of the battery cell 30 along the first direction X. The space saved by setting at least a portion of the tab 322 in the first sub-hole can be used to accommodate the electrode body 321, that is, the size of the electrode body 321 along the first direction X can be increased. In this way, it is beneficial to increase the capacity of the battery cell 30, and thus increase the energy density of the battery cell 30.

[0105] The depth of the recess 313a along the first direction X is not limited and can be selected according to actual needs.

[0106] In some embodiments, along the first direction X, the depth h1 of the recess 313a satisfies: h1≥2.5mm.

[0107] For example, h1 can be 2.5mm, 2.6mm, 2.8mm or 3mm, etc.

[0108] The depth of the recess 313a along the first direction X can be the dimension of the first subspace 31b along the first direction X.

[0109] It is understandable that the more the tab 322 is located in the first subspace 31b, the less space it occupies inside the battery cell 30 along the first direction X.

[0110] Therefore, the depth of the recess 313a satisfies the above relationship, that is, the minimum value of the dimension of the first subspace 31b along the first direction X is 2.5mm. Typically, the sum of the dimension of the tab 322 along the first direction X and the dimension of its connection structure with the electrode terminal 33 in the battery cell 30 is 2.5mm. This allows the tab 322 to be accommodated as much as possible within the first subspace 31b, reducing the space occupied by the tab 322 within the battery cell 30 along one direction. This also helps to further increase the dimension of the electrode body 321 along the first direction X, thereby maximizing the capacity of the battery cell 30 and ultimately increasing its energy density.

[0111] The larger the size of the electrode body 321 along the first direction X, the more beneficial it is to increase the capacity of the battery cell 30. Therefore, under the premise that the external size of the battery cell 30 remains unchanged, the distance between the electrode body 321 and the bottom wall of the recess 313a should be as small as possible.

[0112] In some embodiments, the distance h2 between the electrode body 321 and the bottom wall of the recess 313a satisfies: h2≤3mm.

[0113] For example, h2 can be 3mm, 2.5mm, 2mm, 1.5mm, 1mm, or 0. When h2 is 0, the electrode body 321 abuts against the bottom wall of the recess 313a. In this case, an insulating member can be provided on the side of the bottom wall of the recess 313a facing the receiving cavity 31a.

[0114] It is understandable that the smaller the distance between the electrode body 321 and the bottom wall of the recess 313a along the first direction X, the more of the tab 322 is located within the first subspace 31b along the first direction X. For example, if the tab 322 and the portion connected to the electrode terminal 33 are all located within the first subspace 31b, then the distance between the electrode body 321 and the bottom wall of the recess 313a can be zero.

[0115] Therefore, the distance between the electrode body 321 and the bottom wall of the recess 313a is set to satisfy the above relationship so that the tab 322 is located within the first subspace 31b as much as possible. This is beneficial to increasing the size of the electrode body 321 along the first direction X, thereby increasing the capacity and energy density of the battery cell 30.

[0116] In some embodiments, the electrode terminal 33 is disposed on the bottom wall of the recess 313a, and the end face of the electrode terminal 33 facing away from the receiving cavity 31a is located inside the recess 313a.

[0117] Optionally, the end face of the electrode terminal 33 facing away from the receiving cavity 31a may be located inside the recess 313a, or the side of the electrode terminal 33 facing away from the receiving cavity 31a may be flush with the opening 311a surface of the recess 313a.

[0118] This arrangement allows for full utilization of the extra space occupied by the electrode terminals 33 on the exterior of the battery cell 30, enabling the tabs 322 to be disposed as much as possible within the first subspace 31b along the first direction X, and maximizing the size of the electrode body 321 along the first direction X, thereby increasing the capacity and energy density of the battery cell 30. Furthermore, since the electrode terminals 33 are entirely located within the recess 313a, the risk of loosening due to scraping is reduced. When the battery cell 30 is subjected to impacts, vibrations, or other loads, these loads will be borne by the area corresponding to the first wall 313 and the outer casing 31, and will not be transmitted to the electrode terminals 33. This reduces the vibration and impact loads borne by the electrode terminals 33, maintaining the structural stability of the electrode terminals 33.

[0119] Optionally, the first wall 313 may be part of the housing 311, or the first wall 313 may be part or all of the end cap 312. Of course, a part of the housing 311 may be set as the first wall 313, and at least a part of the end cap 312 may be set as the first wall 313.

[0120] In some embodiments, the housing 31 includes a housing 311 and an end cap 312, the end cap 312 covering the housing 311 to form a receiving cavity 31a, and a first wall 313 being at least a portion of the end cap 312.

[0121] The first wall 313 is set as part of the end cover 312. A recess 313a can be formed on the end cover 312. In the assembly process of the battery cell 30, the electrode assembly 32 is placed into the housing 311, and then the end cover 312 is closed onto the housing 311.

[0122] This design helps to reduce the processing difficulty of the first wall 313 and the complexity of the assembly process of the battery cell 30.

[0123] Figure 7 shows an exploded view of the battery 10 provided in another embodiment of this application; Figure 8 is a partial enlarged view of point M in Figure 7; Figure 9 is an exploded view of the battery cell 30 in Figure 8; Figure 10 is a front view of the battery cell 30 in Figure 8; Figure 11 is a cross-sectional view of Figure 10 along NN.

[0124] As shown in Figures 2 to 11, in some embodiments, the recess 313a is disposed through the battery cell 30 along the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0125] Optionally, the included angles between the first direction X, the second direction Y, and the third direction Z can be right angles, acute angles, or obtuse angles. For example, the first direction X, the second direction Y, and the third direction Z can be set to be perpendicular to each other.

[0126] During the assembly process, battery cells 30 are typically connected to the electrode terminals 33 of two adjacent battery cells 30 via a busbar 40 to achieve series or parallel connection of the corresponding battery cells 30. Therefore, by providing a recess 313a that penetrates the battery cell 30 along the third direction Z, the busbar 40 can easily pass through the recess 313a of the adjacent battery cells 30 during the connection of the electrode terminals 33 of two adjacent battery cells 30 without interfering with other components, which helps to improve the overall structural stability of the battery 10.

[0127] When the end face of the electrode terminal 33 facing away from the electrode assembly 32 along the first direction X is located inside the recess 313a, at least a portion of the busbar 40 can be accommodated in the recess 313a during the process of connecting the electrode terminal 33 of the adjacent battery cell 30 through the busbar 40, thereby further improving the compactness of the internal structure of the battery 10.

[0128] In some embodiments, along the first direction X, the depth h1 of the recess 313a satisfies: h1≥6.5mm.

[0129] In battery 10, the sum of the portion of electrode terminal 33 located within the receiving cavity 31a, the dimension of busbar 40 along the first direction X, and the gap between busbar 40 and electrode terminal 33 is approximately 6.5 mm. That is, after busbar 40 is connected to electrode terminal 33, the distance between the end face of busbar 40 facing away from the bottom wall of recess 313a and the bottom wall of recess 313a is approximately 6.5 mm. By setting the depth h1 of recess 313a to ≥ 6.5 mm, recess 313a has sufficient space to accommodate busbar 40 and electrode terminal 33, meaning busbar 40 and electrode terminal 33 are completely located inside recess 313a. The first wall 313 provides a certain degree of protection for busbar 40 and electrode terminal 33, reducing the risk of connection failure due to scraping of busbar 40 by other components. When battery cell 30 is subjected to impact, vibration, or other loads, the impact and vibration are less likely to be transmitted to busbar 40 and battery 10 terminals, thus further improving the stability of the internal structure of battery 10.

[0130] Referring again to Figures 2 through 11, in some embodiments, two first subspaces 31b are located on both sides of the recess 313a along the second direction Y.

[0131] Correspondingly, the electrode assembly 32 may include two tabs 322 extending from the same end of the electrode body 321, with the two tabs 322 located in two first subspaces 31b respectively.

[0132] Two first electrode terminals 33 are located in the recess 313a. The two electrode terminals 33 can be spaced apart along the third direction Z, or spaced apart along the second direction Y. The specific arrangement can be determined according to the arrangement of the electrode assembly 32 inside the battery cell 30.

[0133] By setting two first subspaces 31b located on both sides of the recess 313a along the second direction Y, it is convenient to reasonably set the number and arrangement of the electrode components 32 inside the battery cell 30 according to actual needs.

[0134] As shown in Figures 2 to 6, in some embodiments, the electrode body 321 has two first surfaces 321a disposed opposite to each other along the second direction Y and two second surfaces 321b disposed opposite to each other along the third direction Z, with the first surfaces 321a connecting the two second surfaces 321b.

[0135] Optionally, one of the first surface 321a and the second surface 321b can be set to be a plane and the other to be a curved surface, or both the first surface 321a and the second surface 321b can be set to be planes. The choice can be made according to actual needs.

[0136] As shown in Figures 7 to 11, in some embodiments, the area of ​​the first surface 321a is larger than the area of ​​the second surface 321b, and the battery cell 30 includes a plurality of electrode components 32, which are arranged along the second direction Y.

[0137] Since the area of ​​the first surface 321a is larger than the area of ​​the second surface 321b, the dimension of the electrode assembly 32 along the third direction Z is larger than the dimension along the second direction Y. The two tabs 322 with opposite polarities of the electrode assembly 32 can be spaced apart along the third direction Z. Arranging multiple electrode assemblies 32 along the second direction Y is beneficial to realize the electrical connection of tabs 322 with the same polarity of different electrode assemblies 32.

[0138] Figure 12 shows an exploded view of another battery 10 provided in an embodiment of this application. Figure 13 shows a partial enlarged view of point C in Figure 12. Figure 14 shows an exploded view of the battery cell 30 in Figure 13. Figure 15 shows a front view of the battery cell 30 in Figure 13. Figure 16 shows a cross-sectional view along DD in Figure 15.

[0139] As shown in Figures 12 to 16, in some embodiments, the area of ​​the first surface 321a is smaller than the area of ​​the second surface 321b, and the battery cell 30 includes a plurality of electrode assemblies 32, which are arranged along the third direction Z.

[0140] Since the area of ​​the first surface 321a is smaller than the area of ​​the second surface 321b, the dimension of the electrode assembly 32 along the third direction Z is smaller than the dimension along the second direction Y. The two tabs 322 of the electrode assembly 32 with opposite polarities can be spaced apart along the second direction Y. Arranging multiple electrode assemblies 32 along the third direction Z facilitates the electrical connection of tabs 322 with the same polarity for different electrode assemblies 32.

[0141] Referring again to Figures 12 to 16, in some embodiments, two recesses 313a are located on both sides of the first subspace 31b along the second direction Y.

[0142] Thus, the first subspace 31b is located at the middle part of the first wall 313 along the second direction Y, and the tab 322 of the electrode assembly 32 is also located at the middle part of the electrode assembly 32 along the second direction Y. An electrode terminal 33 can be provided in each of the two recesses 313a.

[0143] By setting two recesses 313a on both sides of the first subspace 31b along the second direction Y, it is convenient to reasonably set the number and arrangement of the electrode components 32 inside the battery cell 30 according to actual needs.

[0144] In some embodiments, the electrode body 321 has two first surfaces 321a disposed opposite each other along a second direction Y and two second surfaces 321b disposed opposite each other along a third direction Z. The first surfaces 321a connect the two second surfaces 321b, and the surface area of ​​the first surfaces 321a is smaller than the surface area of ​​the second surfaces 321b. The battery cell 30 includes a plurality of electrode assemblies 32, which are arranged along a third direction Z.

[0145] Since the area of ​​the first surface 321a is smaller than the area of ​​the second surface 321b, the dimension of the electrode assembly 32 along the second direction Y is larger than the dimension along the third direction Z, allowing the two tabs 322 with opposite polarities to be spaced apart along the second direction Y. Furthermore, since the second recess 313a is located on both sides of the first subspace 31b along the second direction Y, the electrode terminal 33 can be positioned along the second direction Y on at least one side of the first subspace 31b.

[0146] In some embodiments, the battery cell 30 includes two electrode terminals 33, and one electrode terminal 33 is provided in a recess 313a.

[0147] Since the two tabs 322 of opposite polarity of the electrode assembly 32 are spaced apart in the first subspace 31b along the second direction Y, it is beneficial to place the electrode terminal 33 on both sides of the first subspace 31b along the second direction Y to realize the electrical connection between the electrode terminal 33 and the corresponding tab 322.

[0148] In some embodiments, the battery cell 30 further includes a current collector 34, which is connected to the electrode terminal 33 and the tab 322.

[0149] Optionally, the current collector 34 can be of any shape to achieve electrical connection between the connection terminal and the tab 322. Exemplarily, the current collector 34 can be in the form of a bent sheet.

[0150] Since the electrode terminal 33 is located on the side of the tab 322 along the second direction Y, it is difficult to connect the two directly. Therefore, the battery cell 30 is provided with a current collector 34, and the electrode terminal 33 and the tab 322 are connected through the current collector 34, which helps to reduce the difficulty of connecting the electrode terminal 33 and the tab 322.

[0151] In some embodiments, the current collector 34 includes a first connecting portion 341, a second connecting portion 342, and a bending portion 343. The first connecting portion 341 is connected to the electrode terminal 33, the second connecting portion 342 is located in the first subspace 31b and is connected to the tab 322, and the bending portion 343 connects the first connecting portion 341 and the second connecting portion 342.

[0152] Optionally, a current collector 34 may have one second connection portion 342, or a current collector 34 may have two second connection portions 342, which can be specifically configured according to the arrangement of the electrode assembly 32 inside the battery cell 30.

[0153] The bent portion 343 can be a straight sheet or an arc.

[0154] Since the connection end face between the tab 322 and the current collector 34 is located within the first subspace 313a, the second connecting portion 342 is located within the first subspace 313a to facilitate the electrical connection between the tab 322 and the current collector 34. Since the first connecting portion 341 is connected to the electrode terminal 33 and is located at the bottom of the recess 313a, the first connecting portion 341 and the second connecting portion 342 are spaced apart along the first direction X. The bent portion 343 is provided to facilitate the connection between the first connecting portion 341 and the second connecting portion 342.

[0155] Therefore, this arrangement further facilitates the electrical connection between electrode terminal 33 and tab 322.

[0156] As shown in Figures 9 and 11, in some embodiments, the current collector 34 includes two second connecting portions 342 and two bending portions 343. The two second connecting portions 342 are located on both sides of the first connecting portion 341, and the two bending portions 343 are respectively connected to the brightness of the first connecting portion 341 and the second connecting portion 342.

[0157] In an embodiment where the battery cell 30 includes multiple electrode assemblies 32, and the tabs 322 of the multiple electrode assemblies 32 with the same polarity are respectively located on both sides of the recess 313a, the current collector 34 includes two second connecting parts 342, which connect the tabs 322 of the different electrode assemblies 32 located on both sides of the recess 313a with the same polarity through the two second connecting parts 342.

[0158] Optionally, a second connection portion 342 may be connected to the tab 322 of an electrode assembly 32, or a second connection portion 342 may be provided to connect multiple tabs 322 of the same polarity of the electrode assemblies 32.

[0159] Therefore, the current collector 34 is provided with two second connecting parts 342 and two bending parts 343 to facilitate the electrical connection between the electrode terminal 33 and the tabs 322 with the same polarity located on both sides of the electrode terminal 33.

[0160] The battery 10 provided according to the embodiments of this application includes the battery cell 30 provided in any of the above embodiments.

[0161] The battery 10 provided according to the embodiments of this application has the same technical effect as the battery cell 30 provided in any of the above embodiments, and will not be described again here.

[0162] In some embodiments, the battery 10 further includes a busbar 40, which is connected to the electrode terminal 33 of an adjacent battery cell 30, and the busbar 40 is located within a recess 313a.

[0163] The manifold 40 is located within the recess 313a, meaning that the manifold 40 does not protrude from the recess 313a and is disposed on either side of the first wall 313 along the first direction X.

[0164] Thus, when the battery 10 is subjected to loads such as impact and vibration, these loads will be borne by the first wall 313 of the battery cell 30, making it less likely to be transmitted to the busbar 40 and the electrode terminals 33, which helps to improve the stability of the internal structure of the battery 10. Furthermore, since the busbar 40 is located within the recess 313a, the risk of other components scratching the busbar 40 and causing connection failure between the busbar 40 and the electrode terminals 33 is reduced.

[0165] In addition, during the assembly of the battery cells 30, the first wall 313 of the battery cell 30 can be placed inside the battery box of the battery 10. Since the busbar 40 is located inside the recess 313a, the weight of the battery cell 313 can be supported by the first wall 313 on the side of the recess 313a. The first wall 313 on the side of the recess 313a has a large contact area with the box and is a planar support. Therefore, there is no need to set up additional support components to achieve a stable arrangement of the battery cells 30 inside the box. In this way, the connection stability between the battery cells 30 and the box is improved, and the internal structure of the battery 10 is simplified.

[0166] In some embodiments, the battery 10 includes a plurality of battery cells 30. The end cap 312 of the battery cell 30 has a recess 313a that is concave towards a receiving cavity 31a along a first direction X. The receiving cavity 31a has a first subspace 31b arranged parallel to the recess 313a along a second direction Y. The two first subspaces 31b are located on both sides of the recess 313a along the second direction Y, or the two recesses 313a are located on both sides of the first subspace 31b along the second direction. The tabs 322 are accommodated in as many of the first subspaces 31b as possible. The electrode terminal 33 is disposed in the recess, which is through the third direction Z. The current collector 34 is bent and connects the electrode terminal 33 and the tab 322. The distance between the electrode body 321 and the end cap 312 is less than or equal to 2 mm. The plurality of battery cells 30 are arranged along the third direction Z. The current collector 40 connects the electrode terminals 33 of two adjacent battery cells 30 and is completely accommodated in the recess 313a.

[0167] Therefore, the battery 30 provided in this application embodiment transfers a portion of the extra space occupied outside the battery cell 30 due to the arrangement of electrode terminals 33 and busbars 40 to the first subspace 31b inside the battery cell 30, and utilizes the first subspace 31b to accommodate the tabs 322, thereby increasing the size of the electrode body 321, which is beneficial to increasing the capacity of the battery cell 30, and thus increasing the energy density of the battery 10. Furthermore, since both the electrode terminals 33 and the busbars 40 are accommodated within the recess 313a, the risk of misalignment due to friction is reduced, which is beneficial to improving the connection stability of the electrode terminals 33 and the busbars 40. In the assembly process of the battery 10, the end cap 312 of the battery cell 30 can be placed in the housing. Since the end cap 312 is in surface contact with the housing and has a large contact area, it can provide a certain degree of support for the battery cell 30 without the need for additional support components, which simplifies the internal structure of the battery 10.

[0168] The electrical device provided according to the embodiments of this application includes the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electrical energy.

[0169] The electrical device provided in this application embodiment has the same technical effect as the battery 10 provided in this application embodiment, and will not be described again here.

[0170] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, comprising a current collector and a plurality of battery cells, wherein the battery cells comprise: An electrode assembly includes an electrode body and a tab, the tab being extended from an end of the electrode body along a first direction; The housing has a receiving cavity in which the electrode assembly is received; the housing has a first wall located on the side of the tab facing away from the electrode body, and the first wall has a recess recessed into the receiving cavity along a first direction; the receiving cavity has a first subspace located on at least one side of the recess along a second direction, the second direction intersecting the first direction; at least a portion of the tab is received within the first subspace. An electrode terminal is used for electrical connection with the tab and is at least partially accommodated within the recess; wherein the battery cell includes two spaced-apart electrode terminals, the recess extends through at least one end of the battery cell along the spacing direction of the electrode terminals, and the busbar connects to the electrode terminals of adjacent battery cells along the spacing direction, with at least a portion of the busbar located within the recess.

2. The battery according to claim 1, wherein, Along the first direction, the depth h1 of the recess satisfies: h1≥2.5mm.

3. The battery according to claim 1, wherein, Along the first direction, the distance h2 between the electrode body and the bottom wall of the recess satisfies: h2≤3mm.

4. The battery according to claim 1, wherein, The electrode terminal is disposed on the bottom wall of the recess, and the end face of the electrode terminal facing away from the receiving cavity is located inside the recess.

5. The battery according to claim 1, wherein, The housing includes a shell and an end cap, the end cap being fitted onto the shell to form the receiving cavity, the first wall being at least a portion of the end cap.

6. The battery according to claim 1, wherein, The recess is provided through the battery cell along a third direction, and the first direction, the second direction, and the third direction intersect each other.

7. The battery according to claim 6, wherein, Along the first direction, the depth h1 of the recess satisfies: h1≥6.5mm.

8. The battery according to claim 6 or 7, wherein, The two first subspaces are located on either side of the recess along the second direction.

9. The battery according to claim 8, wherein, The electrode body has two first surfaces arranged opposite each other along the second direction and two second surfaces arranged opposite each other along the third direction. The first surface connects the two second surfaces, and the area of ​​the first surface is larger than the area of ​​the second surface. The battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the second direction.

10. The battery according to claim 8, wherein, The electrode body has two first surfaces arranged opposite each other along a second direction and two second surfaces arranged opposite each other along a third direction. The first surfaces connect the two second surfaces, and the area of ​​the first surface is smaller than the area of ​​the second surface. The battery cell includes a plurality of electrode assemblies, which are arranged along the third direction.

11. The battery according to claim 6 or 7, wherein, The two recesses are located on both sides of the first subspace along the second direction.

12. The battery according to claim 11, wherein, The electrode body has two first surfaces arranged opposite each other along the second direction and two second surfaces arranged opposite each other along the third direction. The first surface connects the two second surfaces, and the surface area of ​​the first surface is smaller than the surface area of ​​the second surface. The battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the third direction.

13. The battery according to claim 12, wherein, One of the recesses is provided with one of the electrode terminals.

14. The battery according to claim 1, wherein, The battery cell also includes a current collector, which connects the electrode terminals and the tabs.

15. The battery according to claim 14, wherein, The current collector includes a first connecting part, a second connecting part, and a bending part. The first connecting part is connected to the electrode terminal, the second connecting part is located in the first subspace and is connected to the electrode tab, and the bending part connects the first connecting part and the second connecting part.

16. The battery according to claim 15, wherein, The current collector includes two second connecting portions and two bending portions. The two second connecting portions are located on both sides of the first connecting portion, and the two bending portions are respectively connected to the two ends of the first connecting portion and the second connecting portion.

17. An electrical device comprising a battery as claimed in any one of claims 1 to 16, the battery being used to provide electrical energy.

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