Battery cell, method and system for manufacturing the same, battery, and electric device

Abstract

The application provides a battery monomer, a manufacturing method and a manufacturing system thereof, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal. An outer surface of the shell is provided with a recess. The electrode assembly is accommodated in the shell. At least part of the electrode terminal is accommodated in the recess, and the electrode terminal is used for electrically connecting with the electrode assembly to export the electric energy of the electrode assembly. The recess is used for accommodating at least part of a bus component of the battery, and the bus component is used for connecting the electrode terminals of a plurality of battery monomers to electrically connect the plurality of battery monomers. The application can save the space occupied by the bus component in the battery, increase the space utilization rate in the battery, and improve the energy density of the battery.

Description

Technical Field

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

[0002] Battery cells 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. 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, improving energy density is one of the research directions. Summary of the Invention

[0004] This application provides a battery cell, a method and system for manufacturing the same, a battery, and an electrical device that can improve energy density.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and electrode terminals. The outer surface of the housing has a recess. The electrode assembly is housed within the housing. At least a portion of the electrode terminals is housed within the recess, and the electrode terminals are used for electrical connection with the electrode assembly to conduct electrical energy from the electrode assembly. The recess is used to house at least a portion of a busbar component of the battery, and the busbar component is used to connect the electrode terminals of multiple battery cells to electrically connect the multiple battery cells.

[0006] In the above solution, by creating recesses in the outer casing, the size of the electrode terminals protruding from the outer surface of the casing is reduced, thereby reducing the overall size of the battery cell and the space occupied by the battery cell within the battery. The recesses can also accommodate at least a portion of the busbar component, thus saving space occupied by the busbar component within the battery, increasing the internal space utilization of the battery, and improving the energy density of the battery.

[0007] In some embodiments, the portion of the electrode terminal located outside the housing is completely accommodated within the recess.

[0008] In the above scheme, the electrode terminals do not protrude from the outer surface of the casing and do not additionally increase the size of the battery cell, thereby improving the energy density of the battery cell. When multiple battery cells are arranged sequentially, the electrode terminals will not interfere with the casings of adjacent battery cells, thereby reducing the spacing between the casings of adjacent battery cells and improving the energy density.

[0009] In some embodiments, the housing includes two first surfaces disposed opposite to each other along a first direction, two second surfaces disposed opposite to each other along a second direction, and two third surfaces disposed opposite to each other along a third direction.

[0010] In some embodiments, the area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface.

[0011] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0012] In some embodiments, the recess is recessed relative to the first surface. The electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities, at least a portion of the first electrode terminal and at least a portion of the second electrode terminal being received in the recess.

[0013] In the above scheme, the recess can be used to accommodate both the first electrode terminal and the second electrode terminal, which simplifies the molding process of the housing.

[0014] In some embodiments, the first electrode terminal and the second electrode terminal are disposed correspondingly along a second direction.

[0015] In the above scheme, the first electrode terminal and the second electrode terminal are arranged correspondingly in the second direction, so that the first electrode terminal and the second electrode terminal can share the same space in the third direction, effectively improving the space utilization rate and thus improving the energy density of the battery cell.

[0016] In some embodiments, the recess extends to two second surfaces at both ends along the second direction. The busbar can extend into the recess from the side near the second surface to connect to the first electrode terminal or the second electrode terminal.

[0017] In some embodiments, the recess extends to a third surface at one end in a third direction. The bus member can extend into the recess from the side near the third surface to connect to a first electrode terminal or a second electrode terminal.

[0018] In some embodiments, the recess includes a first recess and a second recess spaced apart, wherein at least a portion of the first electrode terminal is accommodated in the first recess and at least a portion of the second electrode terminal is accommodated in the second recess.

[0019] In some embodiments, the first recess and the second recess are respectively disposed along the second direction.

[0020] In the above scheme, the first recess and the second recess share the same space in the third direction, which can reserve more space for the electrode assembly in the third direction, thereby effectively increasing the capacity of the electrode assembly.

[0021] In some embodiments, one end of the first recess opposite to the second recess extends to a second surface, and one end of the second recess opposite to the first recess extends to another second surface. A bus member may extend into the first recess from the side near one of the second surfaces to connect to a first electrode terminal; another bus member may extend into the second recess from the side near the other second surface to connect to a second electrode terminal.

[0022] In some embodiments, one end of the first recess along a third direction and one end of the second recess along a third direction extend to the same third surface. Two busbars can extend into the first recess and the second recess from the side near the third surface, respectively, to connect to the first electrode terminal and the second electrode terminal, respectively.

[0023] In some embodiments, the projection of the first recess along the first direction and the projection of the first recess along the first direction are arranged along the diagonal direction of the projection of the housing in the first direction.

[0024] In some embodiments, one end of the first recess extends along a second direction to a second surface, and one end of the second recess extends along a second direction to another second surface. A bus member may extend into the first recess from the side near one of the second surfaces to connect to a first electrode terminal; another bus member may extend into the second recess from the side near the other second surface to connect to a second electrode terminal.

[0025] In some embodiments, the first recess extends to a third surface at one end in a third direction, and the second recess extends to another third surface at one end in a third direction. A bus member may extend into the first recess from the side near one third surface to connect to a first electrode terminal; another bus member may extend into the second recess from the side near the other third surface to connect to a second electrode terminal.

[0026] In some embodiments, the recess includes a first recess and a second recess, the first recess being recessed relative to a second surface and the second recess being recessed relative to another second surface. The electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities, at least a portion of the first electrode terminal being received within the first recess and at least a portion of the second electrode terminal being received within the second recess.

[0027] In some embodiments, the first recess extends to two first surfaces at both ends along a first direction, and the second recess extends to two first surfaces at both ends along the first direction. A bus member can extend into the first recess from one side near a first surface to connect to a first electrode terminal; another bus member can extend into the second recess from one side near a first surface to connect to a second electrode terminal.

[0028] In some embodiments, the first recess and the second recess are respectively disposed along the second direction.

[0029] In the above scheme, the first recess and the second recess share the same space in the third direction, which can reserve more space for the electrode assembly in the third direction, thereby effectively increasing the capacity of the electrode assembly.

[0030] In some embodiments, one end of the first recess along a third direction and one end of the second recess along a third direction extend to the same third surface. Two busbars can extend into the first recess and the second recess from the side near the third surface, respectively, to connect to the first electrode terminal and the second electrode terminal, respectively.

[0031] In some embodiments, the electrode assembly includes a body portion, a first electrode tab, and a second electrode tab, the first electrode tab and the second electrode tab extending from the body portion and having opposite polarities. In a second direction, at least a portion of the first electrode tab is located between and electrically connected to the first electrode terminal, and at least a portion of the second electrode tab is located between and electrically connected to the second electrode terminal.

[0032] The above scheme utilizes the space between the first electrode terminal and the second electrode terminal to arrange the first electrode tab and the second electrode tab, which allows for more space to be reserved in the main body and increases the capacity of the electrode assembly.

[0033] In some embodiments, the first recess and the second recess are arranged diagonally on the housing.

[0034] In some embodiments, the first recess extends to a third surface at one end in a third direction, and the second recess extends to another third surface at one end in a third direction. A bus member may extend into the first recess from the side near one third surface to connect to a first electrode terminal; another bus member may extend into the second recess from the side near the other third surface to connect to a second electrode terminal.

[0035] Secondly, embodiments of this application provide a battery, comprising: a plurality of battery cells according to any of the embodiments of the first aspect; and a busbar for connecting the electrode terminals of the plurality of battery cells to electrically connect the plurality of battery cells. A recess in each battery cell is used to accommodate at least a portion of the busbar.

[0036] In some embodiments, the busbar is housed entirely within a space formed by the recesses of multiple battery cells, thereby improving space utilization and increasing the energy density of the battery.

[0037] Thirdly, embodiments of this application provide an electrical device including a battery cell according to any of the embodiments of the first aspect, wherein the battery cell is used to provide electrical energy.

[0038] Fourthly, embodiments of this application provide a method for manufacturing a single battery cell, comprising:

[0039] A housing and electrode terminals are provided, wherein the outer surface of the housing is provided with a recess, and at least a portion of the electrode terminals are accommodated within the recess;

[0040] Provide electrode assemblies;

[0041] The electrode assembly is installed inside the housing, and the electrode terminals are connected to the electrode assembly to discharge the electrical energy from the electrode assembly.

[0042] The recess is used to accommodate at least a portion of the battery's busbar component, which is used to connect the electrode terminals of multiple battery cells to electrically connect the multiple battery cells.

[0043] Fifthly, embodiments of this application provide a manufacturing system for a single battery cell, comprising:

[0044] A first providing device is used to provide a housing and electrode terminals, wherein the outer surface of the housing is provided with a recess, and at least a portion of the electrode terminals is accommodated within the recess;

[0045] A second providing device is used to provide electrode assemblies;

[0046] An assembly device for mounting electrode assemblies within a housing and connecting electrode terminals to the electrode assembly to discharge electrical energy from the electrode assembly;

[0047] The recess is used to accommodate at least a portion of the battery's busbar component, which is used to connect the electrode terminals of multiple battery cells to electrically connect the multiple battery cells. Attached Figure Description

[0048] 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.

[0049] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0050] Figure 2 Explosion diagrams of batteries provided for some embodiments of this application;

[0051] Figure 3 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application;

[0052] Figure 4 for Figure 3 A cross-sectional schematic diagram of a single battery cell is shown.

[0053] Figure 5 for Figure 3 A cross-sectional schematic diagram of the battery cell and the busbar connected to the battery cell;

[0054] Figure 6 A perspective view of a battery cell provided for other embodiments of this application;

[0055] Figure 7 A three-dimensional schematic diagram of a battery cell provided for some embodiments of this application;

[0056] Figure 8 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application;

[0057] Figure 9 A perspective view of a battery cell provided for other embodiments of this application;

[0058] Figure 10 A three-dimensional schematic diagram of a battery cell provided for some embodiments of this application;

[0059] Figure 11 for Figure 10 A cross-sectional schematic diagram of the battery cell and the busbar connected to the battery cell;

[0060] Figure 12 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application;

[0061] Figure 13 for Figure 12 A cross-sectional schematic diagram of a single battery cell is shown.

[0062] Figure 14 A perspective view of a battery cell provided for other embodiments of this application;

[0063] Figure 15 A schematic flowchart illustrating a method for manufacturing a single battery cell according to some embodiments of this application;

[0064] Figure 16 This is a schematic flowchart illustrating a method for manufacturing a battery cell according to some embodiments of this application.

[0065] The accompanying drawings are not drawn to scale. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0072] 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.

[0073] In this application, "multiple" means two or more (including two).

[0074] In this application, the battery cell may include lithium-ion secondary battery cell, lithium-ion primary battery cell, lithium-sulfur battery cell, sodium lithium-ion battery cell, sodium-ion battery cell, or magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto.

[0075] 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 be 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.

[0076] A 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, which is coated on the surface of the positive current collector. The positive current collector includes a positive current-collecting section and a positive electrode tab; the positive current-collecting section is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive 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, which is coated on the surface of the negative current collector. The negative current collector includes a negative current-collecting section and a negative electrode tab; the negative current-collecting section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0077] The battery cell also includes a housing and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are mounted on the housing and electrically connected to the electrode assembly to conduct electrical energy from the electrode assembly.

[0078] With the development of battery technology, users are demanding increasingly higher battery capacity. For example, with the increasing popularity of new energy vehicles, the requirements for the batteries used in these vehicles are becoming more stringent. As users' demands for the driving range of new energy vehicles continue to rise, the capacity of the batteries used in these vehicles needs to be continuously increased.

[0079] A battery consists of a housing and multiple battery cells housed within the housing. These battery cells can be connected in series, in parallel, or in a mixed configuration. A mixed configuration refers to a configuration in which multiple battery cells are connected in both series and parallel.

[0080] In related technologies, multiple battery cells are electrically connected through a busbar; the electrode terminals generally protrude from the casing to facilitate connection with external busbars. However, the inventors have discovered that protruding electrode terminals increase the size of the battery cells and the space they occupy within the casing, and the busbar also occupies internal space within the battery. This reduces the internal space utilization of the battery, resulting in lower energy density.

[0081] In view of this, this application provides a technical solution in which a battery cell includes a casing, an electrode assembly, and electrode terminals. The outer surface of the casing has a recess. The electrode assembly is housed within the casing. At least a portion of the electrode terminals is housed within the recess, and the electrode terminals are used to electrically connect with the electrode assembly to conduct electrical energy from the electrode assembly. The recess is used to house at least a portion of a current-connecting component of the battery, which connects the electrode terminals of multiple battery cells to electrically connect the multiple battery cells. This technical solution reduces the size of the electrode terminals protruding from the outer surface of the casing by creating a recess in the casing, thereby reducing the overall size of the battery cell and the space occupied by the battery cell within the battery. The recess can also accommodate at least a portion of the current-connecting component, thus saving space occupied by the current-connecting component within the battery, increasing the internal space utilization of the battery, and improving the energy density of the battery.

[0082] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0083] 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.

[0084] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0085] Figure 1 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0086] like Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0087] Vehicle 1 may also include controller 3 and motor 4. Controller 3 is used to control battery 2 to supply power to motor 4, for example, for the power needs of vehicle 1 during start-up, navigation and driving.

[0088] In some embodiments of this application, the battery 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.

[0089] Figure 2 This is an exploded schematic diagram of a battery provided for some embodiments of this application.

[0090] like Figure 2 As shown, battery 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed inside the housing 5.

[0091] The housing 5 is used to house the battery cell 6, 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 6. 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.

[0092] 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.

[0093] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0094] In battery 2, there can be one or more battery cells 6. If there are multiple battery cells 6, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0095] Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the whole composed of multiple battery cells 6 can be housed in the housing 5; of course, multiple battery cells 6 can also be connected in series, parallel, or in a mixed manner to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a mixed manner to form a whole, and housed in the housing 5.

[0096] In some embodiments, the battery cells 6 are directly mounted onto the housing 5. This eliminates the need for assembling multiple battery cells 6 into a battery module and also eliminates the need for a fixing frame in the battery module to secure the battery cells 6, thus simplifying the battery structure and increasing the battery's energy density.

[0097] In some embodiments, the battery 2 further includes a busbar 7 for connecting multiple battery cells 6 to achieve series, parallel, or mixed connection among the multiple battery cells 6.

[0098] In some embodiments, there may be multiple busbars 7. Exemplarily, each busbar 7 connects to two adjacent battery cells 6.

[0099] Figure 3 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application; Figure 4 for Figure 3 A cross-sectional schematic diagram of a single battery cell is shown. Figure 5 for Figure 3 The diagram shows a cross-sectional view of the battery cell and the busbar connected to the battery cell.

[0100] like Figures 3 to 5 As shown, the battery cell 6 in this embodiment includes an electrode assembly 10, a housing 20, and electrode terminals 30. A recess 24 is provided on the outer surface of the housing 20. The electrode assembly 10 is housed within the housing 20. At least a portion of the electrode terminals 30 is housed within the recess 24, and the electrode terminals 30 are used for electrical connection with the electrode assembly 10 to conduct electrical energy from the electrode assembly 10. The recess 24 is used to house at least a portion of a current-connecting component 7 of the battery, and the current-connecting component 7 is used to connect the electrode terminals 30 of a plurality of battery cells 6 to electrically connect the plurality of battery cells 6.

[0101] The electrode assembly 10 is the core component for enabling the charging and discharging function of the battery cell 6. It includes a first electrode, a second electrode, and a separator. The first and second electrodes have opposite polarities, and the separator is used to insulate and isolate the first and second electrodes. The electrode assembly 10 mainly relies on the movement of metal ions between the first and second electrodes to operate.

[0102] One of the first and second electrodes is the positive electrode, and the other of the first and second electrodes is the negative electrode.

[0103] The electrode assembly 10 can be one or more, and this embodiment does not limit this.

[0104] The outer shell 20 is a hollow structure, with an internal cavity for accommodating the electrode assembly 10 and the electrolyte. The outer shell 20 can be of various shapes, such as a cylinder or a cuboid. The shape of the outer shell 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cylindrical structure, a cylindrical outer shell can be used; if the electrode assembly 10 is a cuboid structure, a cuboid outer shell can be used.

[0105] The recess 24 is recessed relative to the outer surface of the housing 20. The electrode terminal 30 can be mounted on the bottom wall of the recess 24 or on the side wall of the recess 24.

[0106] The electrode terminal 30 may be entirely housed within the recess 24 or only partially housed within the recess 24. For example, a portion of the electrode terminal 30 may pass through the housing 20 and extend into the interior of the housing 20 to achieve an electrical connection between the electrode terminal 30 and the electrode assembly 10.

[0107] The electrode terminal 30 may protrude from the outer surface of the housing 20 or may not protrude from the outer surface of the housing 20.

[0108] In the battery, the busbar component 7 can be connected to the electrode terminals 30 of the battery cell 6 by welding, bonding, snapping or other means.

[0109] For example, the portion of the busbar 7 that is housed within the recess 24 is connected to the electrode terminal 30.

[0110] In this embodiment, the arrangement direction of the busbar 7 and the electrode terminal 30 is not limited. For example, the busbar 7 can be connected to the top surface of the electrode terminal 30 or to the side surface of the electrode terminal 30.

[0111] In this embodiment, by creating a recess 24 in the housing 20, the size of the electrode terminal 30 protruding from the outer surface of the housing 20 is reduced, thereby reducing the overall size of the battery cell 6 and the space occupied by the battery cell 6 within the battery. The recess 24 can also accommodate at least a portion of the busbar component 7, thus saving space occupied by the busbar component 7 within the battery, increasing the space utilization rate inside the battery, and improving the energy density of the battery.

[0112] In this embodiment, the recess 24 can also be used to accommodate other components of the battery, such as sampling components, cooling components, etc.

[0113] In some embodiments, the housing 20 includes a housing 20a and an end cap 20b, the housing 20a having an opening at one end, and the end cap 20b covering the opening of the housing 20a. The electrode terminal 30 may be mounted on the housing 20a or on the end cap 20b.

[0114] In some embodiments, the electrode assembly 10 includes a main body 11 and a first tab 12 and a second tab 13 extending from the main body 11. The main body 11 is the electrogenerating part of the electrode assembly 10, and the active material inside it is used to undergo an electrochemical reaction with an electrolyte or the like to generate a charge-discharge process. The first tab 12 and the second tab 13 are used to conduct electrical energy generated by the main body 11. Exemplarily, the first tab 12 is the region of the first electrode sheet that is not coated with an active material layer, and the second tab 13 is the region of the second electrode sheet that is not coated with an active material layer.

[0115] In some embodiments, the portion of the electrode terminal 30 located outside the housing 20 is completely accommodated within the recess 24.

[0116] In this embodiment, the electrode terminals 30 do not protrude from the outer surface of the housing 20 and do not additionally increase the size of the battery cell 6, thereby improving the energy density of the battery cell 6. When multiple battery cells 6 are arranged sequentially, the electrode terminals 30 will not interfere with the housing 20 of adjacent battery cells 6, thereby reducing the spacing between the housings 20 of adjacent battery cells 6 and improving the energy density.

[0117] In some embodiments, the housing 20 includes two first surfaces 21 disposed opposite to each other along a first direction X, two second surfaces 22 disposed opposite to each other along a second direction Y, and two third surfaces 23 disposed opposite to each other along a third direction Z.

[0118] For example, the first surface 21 is a plane perpendicular to the first direction X, the second surface 22 is a plane perpendicular to the second direction Y, and the third surface 23 is a plane perpendicular to the third direction Z.

[0119] The first direction X, the second direction Y, and the third direction Z intersect each other.

[0120] For example, the outer casing 20 is prismatic.

[0121] The first surface 21 is connected to two second surfaces 22 at its two ends along the second direction Y. The first surface 21 and the second surface 22 can be directly connected or indirectly connected through other surfaces (such as arc surfaces).

[0122] The first surface 21 is connected to two third surfaces 23 at its two ends along the third direction Z. The first surface 21 and the third surface 23 can be directly connected or indirectly connected through other surfaces (such as arc surfaces).

[0123] In some embodiments, the area of ​​the first surface 21 is greater than the area of ​​the second surface 22, and the area of ​​the first surface 21 is greater than the area of ​​the third surface 23.

[0124] In this embodiment, the first surface 21 is the surface with the largest area of ​​the outer shell 20.

[0125] In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0126] In this embodiment, the outer shell 20 is generally a cuboid.

[0127] In some embodiments, the recess 24 is recessed relative to the first surface 21. The electrode terminal 30 includes a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities, at least a portion of the first electrode terminal 31 and at least a portion of the second electrode terminal 32 being received in the recess 24.

[0128] The recess 24 forms an opening on the first surface 21. Exemplarily, the bottom surface of the recess 24 is parallel to the first surface 21.

[0129] The first electrode terminal 31 is electrically connected to the first electrode tab 12, and the second electrode terminal 32 is electrically connected to the second electrode tab 13, thereby discharging electrical energy from the electrode assembly 10.

[0130] In some embodiments, the first electrode tab 12 is directly connected to the first electrode terminal 31, and the second electrode tab 13 is directly connected to the second electrode terminal 32.

[0131] For example, the electrode assembly 10 has a stacked structure, with multiple first electrodes and multiple second electrodes alternately stacked along the first direction X.

[0132] For example, the electrode assembly 10 has a stacked structure, the first electrode is continuously bent and includes multiple stacked segments and multiple bending segments, the multiple stacked segments and multiple second electrodes are stacked alternately along the first direction X, and each bending segment is used to connect two adjacent stacked segments.

[0133] For example, the electrode assembly 10 has a wound structure, in which the first electrode and the second electrode are wound around a winding axis to form a wound structure. The winding axis is perpendicular to the first direction X.

[0134] For example, the portion of the first electrode terminal 31 located outside the housing 20 is completely accommodated within the recess 24, and the portion of the second electrode terminal 32 located outside the housing 20 is completely accommodated within the recess 24.

[0135] In this embodiment, the recess 24 can be used to accommodate both the first electrode terminal 31 and the second electrode terminal 32, which simplifies the molding process of the housing 20.

[0136] In some embodiments, the first electrode terminal 31 and the second electrode terminal 32 are disposed correspondingly along the second direction Y.

[0137] In this embodiment, the projection of the first electrode terminal 31 along the second direction Y at least partially overlaps with the projection of the second electrode terminal 32 along the second direction Y. The projections of the first electrode terminal 31 and the second electrode terminal 32 are projections in the same plane perpendicular to the second direction Y.

[0138] In this embodiment, the first electrode terminal 31 and the second electrode terminal 32 are respectively arranged in the second direction Y, so that the first electrode terminal 31 and the second electrode terminal 32 can share the same space in the third direction Z, effectively improving the space utilization rate and thereby increasing the energy density of the battery cell 6.

[0139] This embodiment can also reduce the misalignment of the first electrode terminal 31 and the second electrode terminal 32 in the third direction Z. Thus, when multiple battery cells 6 are connected in series, this solution helps to connect the first electrode terminal 31 and the second electrode terminal 32 of adjacent battery cells 6.

[0140] In some embodiments, the recess 24 extends to two second surfaces 22 at both ends along the second direction Y.

[0141] In this embodiment, the busbar component 7 can extend into the recess 24 from the side near the second surface 22 to connect to the first electrode terminal 31 or the second electrode terminal 32.

[0142] In some embodiments, a plurality of battery cells 6 are arranged along a first direction X, and adjacent battery cells 6 are electrically connected via a busbar 7.

[0143] In this embodiment, the first surfaces 21 of adjacent battery cells 6 are opposite each other, and the first surface 21 is the surface with the largest area of ​​the outer casing 20, so that the overall structure composed of multiple battery cells 6 can be more uniform in size in all directions.

[0144] In some embodiments, in two adjacent battery cells 6, the first electrode terminal 31 of one battery cell 6 and the second electrode terminal 32 of the other battery cell 6 are arranged correspondingly along the first direction X. The busbar component 7 is bent into a U-shaped structure, which includes a first busbar 7a, a second busbar 7b and a third busbar 7c. The first busbar 7a is used to extend into the recess 24 of one battery cell 6 and connect to the first electrode terminal 31. The second busbar 7b is used to extend into the recess 24 of the other battery cell 6 and connect to the second electrode terminal 32. The third busbar 7c connects the first busbar 7a and the second busbar 7b and is located on one side of the other battery cell 6 along the second direction Y.

[0145] In a plurality of battery cells 6 arranged in sequence, each battery cell 6 is rotated 180° relative to the adjacent battery cell 6 along an axis parallel to the first direction X, so that the first electrode terminal 31 of each battery cell 6 and the second electrode terminal 32 of the adjacent battery cell 6 are arranged correspondingly along the first direction X.

[0146] In this embodiment, the busbar component 7 does not occupy additional space in the first direction X.

[0147] In other embodiments, in two adjacent battery cells 6, the first electrode terminals 31 of the two battery cells 6 are arranged correspondingly along the first direction X, and the busbar 7 connects the first electrode terminals 31 of the two battery cells 6 to connect the two battery cells 6 in parallel.

[0148] Figure 6This is a perspective view of a battery cell provided for other embodiments of this application.

[0149] like Figure 6 As shown, in some embodiments, the recess 24 extends to a third surface 23 at one end in the third direction Z.

[0150] The recess 24 is formed at the end of the outer casing 20 along the third direction Z.

[0151] In this embodiment, the busbar can extend into the recess 24 from the side near the third surface 23 to connect to the first electrode terminal 31 or the second electrode terminal 32.

[0152] In some embodiments, the recess 24 extends to two second surfaces 22 at both ends along the second direction Y. In this case, the busbar can extend into the recess 24 from either the side near the third surface 23 or the side near the second surface 22, which helps to simplify the assembly process of the busbar.

[0153] Figure 7 This is a three-dimensional schematic diagram of a battery cell provided for some embodiments of this application.

[0154] like Figure 7 As shown, in some embodiments, the recess 24 includes a first recess 241 and a second recess 242 spaced apart, at least a portion of the first electrode terminal 31 is accommodated in the first recess 241, and at least a portion of the second electrode terminal 32 is accommodated in the second recess 242.

[0155] In some embodiments, the portion of the first electrode terminal 31 located outside the housing 20 is completely accommodated within the first recess 241, and the portion of the second electrode terminal 32 located outside the housing 20 is completely accommodated within the second recess 242.

[0156] In some embodiments, the first recess 241 and the second recess 242 are respectively disposed along the second direction Y.

[0157] In this embodiment, the projection of the first recess 241 along the second direction Y and the projection of the second recess 242 along the second direction Y at least partially overlap. The projections of the first recess 241 and the second recess 242 are projections in the same plane perpendicular to the second direction Y.

[0158] In this embodiment, the first recess 241 and the second recess 242 share the same space in the third direction Z, which can reserve more space for the electrode assembly 10 in the third direction Z, thereby effectively increasing the capacity of the electrode assembly 10.

[0159] In some embodiments, one end of the first recess 241 opposite to the second recess 242 extends to a second surface 22, and one end of the second recess 242 opposite to the first recess 241 extends to another second surface 22.

[0160] In this embodiment, one busbar 7 can extend into the first recess 241 from the side near a second surface 22 to connect to the first electrode terminal 31; another busbar 7 can extend into the second recess 242 from the side near another second surface 22 to connect to the second electrode terminal 32.

[0161] Figure 8 This is a perspective view of a battery cell provided in some embodiments of this application.

[0162] like Figure 8 As shown, in some embodiments, one end of the first recess 241 along the third direction Z and the other end of the second recess 242 along the third direction Z extend to the same third surface 23.

[0163] The first recess 241 and the second recess 242 are formed at the same end of the outer casing 20 along the third direction Z.

[0164] In this embodiment, the two busbar components 7 can extend into the first recess 241 and the second recess 242 from the side near the third surface 23, respectively, to connect to the first electrode terminal 31 and the second electrode terminal 32, respectively.

[0165] In some embodiments, one end of the first recess 241 opposite to the second recess 242 extends to a second surface 22, and one end of the second recess 242 opposite to the first recess 241 extends to another second surface 22.

[0166] Figure 9 This is a perspective view of a battery cell provided for other embodiments of this application.

[0167] like Figure 9 As shown, in some embodiments, the projection of the first recess 241 along the first direction X and the projection of the first recess 241 along the first direction X are arranged along the diagonal direction of the projection of the housing 20 onto the first direction X.

[0168] In the above description, the projections of the first recess 241, the second recess 242, and the outer shell 20 are all projections in the same plane perpendicular to the first direction X.

[0169] In some embodiments, the housing 20 is rotationally symmetrical about an axis parallel to the first direction X by 180°.

[0170] In some embodiments, the first recess 241 extends at one end along the second direction Y to a second surface 22, and the second recess 242 extends at one end along the second direction Y to another second surface 22.

[0171] In this embodiment, one busbar 7 can extend into the first recess 241 from the side near a second surface 22 to connect to the first electrode terminal 31; another busbar 7 can extend into the second recess 242 from the side near another second surface 22 to connect to the second electrode terminal 32.

[0172] In some embodiments, the first recess 241 extends to a third surface 23 at one end in the third direction Z, and the second recess 242 extends to another third surface 23 at one end in the third direction Z.

[0173] In this embodiment, one busbar 7 can extend into the first recess 241 from the side near a third surface 23 to connect to the first electrode terminal 31; another busbar 7 can extend into the second recess 242 from the side near another third surface 23 to connect to the second electrode terminal 32.

[0174] Figure 10 A three-dimensional schematic diagram of a battery cell provided for some embodiments of this application; Figure 11 for Figure 10 The diagram shows a cross-sectional view of the battery cell and the busbar connected to the battery cell.

[0175] like Figure 10 and Figure 11 As shown, in some embodiments, the recess includes a first recess 241 and a second recess 242, the first recess 241 being recessed relative to one second surface 22, and the second recess 242 being recessed relative to another second surface 22. The electrode terminal 30 includes a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities, at least a portion of the first electrode terminal 31 being received within the first recess 241, and at least a portion of the second electrode terminal 32 being received within the second recess 242.

[0176] In some examples, the first recess 241 extends to two first surfaces 21 at both ends along the first direction X, and the second recess 242 extends to two first surfaces 21 at both ends along the first direction X.

[0177] In this embodiment, one busbar 7 can extend into the first recess 241 from the side near a first surface 21 to connect to the first electrode terminal 31; another busbar 7 can extend into the second recess 242 from the side near a first surface 21 to connect to the second electrode terminal 32.

[0178] When multiple battery cells 6 are arranged along the first direction X, the first recesses 241 of the multiple battery cells 6 are opposite each other along the first direction X. The busbar component 7 can simultaneously extend into the first recesses 241 of the multiple battery cells 6 along the first direction X and connect to the first electrode terminals 31 of the multiple battery cells 6, thereby realizing the parallel connection of the multiple battery cells 6.

[0179] This embodiment simplifies the structure of the current collector 7 and reduces the assembly difficulty of the current collector 7. The current collector 7 is housed entirely within the space formed by the first recess 241 of multiple battery cells 6, thereby improving space utilization and increasing the energy density of the battery.

[0180] For example, the busbar component 7 is a flat plate structure parallel to the first direction X.

[0181] In some embodiments, the first recess 241 and the second recess 242 are respectively disposed along the second direction Y.

[0182] In this embodiment, the first recess 241 and the second recess 242 share the same space in the third direction Z, which can reserve more space for the electrode assembly 10 in the third direction Z, thereby effectively increasing the capacity of the electrode assembly 10.

[0183] In a plurality of battery cells 6 arranged sequentially along the first direction X, each battery cell 6 is rotated 180° relative to the adjacent battery cell 6 along an axis parallel to the first direction X, so that the first recess 241 of each battery cell 6 and the second recess 242 of the adjacent battery cell 6 are arranged correspondingly along the first direction X.

[0184] The busbar component 7 can simultaneously extend into the first recess 241 of one battery cell 6 and the second recess 242 of another battery cell 6 along the first direction X, and connect the first electrode terminal 31 and the second electrode terminal 32, thereby realizing the series connection of two battery cells 6. At this time, the busbar component 7 is entirely accommodated within the space formed by the first recess 241 and the second recess 242, thereby improving space utilization and increasing the energy density of the battery.

[0185] In some embodiments, the busbar 7 is entirely housed within a space formed by the recesses of multiple battery cells 6, thereby improving space utilization and increasing the energy density of the battery.

[0186] In some embodiments, the first electrode tab 12 is electrically connected to the first electrode terminal 31 via an adapter 40, and the second electrode tab 13 is electrically connected to the second electrode terminal 32 via another adapter 40.

[0187] Figure 12 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application; Figure 13 for Figure 12The diagram shows a cross-sectional view of a single battery cell.

[0188] like Figure 12 and Figure 13 As shown, the first recess 241 extends to one end along the third direction Z and the second recess 242 extends to the same third surface 23 along the third direction Z.

[0189] In this embodiment, the first recess 241 and the second recess 242 are located at the same end of the outer casing 20 along the third direction Z.

[0190] In this embodiment, the two busbar components 7 can extend into the first recess 241 and the second recess 242 from the side near the third surface 23, respectively, to connect to the first electrode terminal 31 and the second electrode terminal 32, respectively.

[0191] In some embodiments, the first recess 241 extends to two first surfaces 21 at both ends along the first direction X, and the second recess 242 extends to two first surfaces 21 at both ends along the first direction X.

[0192] In some embodiments, the electrode assembly includes a main body 11, a first electrode tab 12, and a second electrode tab 13, the first electrode tab 12 and the second electrode tab 13 extending from the main body 11 and having opposite polarities. In the second direction Y, at least a portion of the first electrode tab 12 is located between and electrically connected to the first electrode terminal 31, and at least a portion of the second electrode tab 13 is located between and electrically connected to the second electrode terminal 32.

[0193] The first electrode 12 and the second electrode 13 are arranged at intervals along the second direction Y.

[0194] In this embodiment, the first electrode tab 12 and the second electrode tab 13 are arranged in the space between the first electrode terminal 31 and the second electrode terminal 32, which can reserve more space for the main body 11 and increase the capacity of the electrode assembly 10.

[0195] Figure 14 This is a perspective view of a battery cell provided for other embodiments of this application.

[0196] like Figure 14 As shown, in some embodiments, the first recess 241 and the second recess 242 are arranged diagonally on the housing 20.

[0197] In some embodiments, the housing 20 is rotationally symmetrical about an axis parallel to the first direction X by 180°.

[0198] In some embodiments, the first recess 241 extends to a third surface 23 at one end in the third direction Z, and the second recess 242 extends to another third surface 23 at one end in the third direction Z.

[0199] In this embodiment, one busbar 7 can extend into the first recess 241 from the side near a third surface 23 to connect to the first electrode terminal 31; another busbar 7 can extend into the second recess 242 from the side near another third surface 23 to connect to the second electrode terminal 32.

[0200] Figure 15 This is a schematic flowchart illustrating a manufacturing method provided in some embodiments of this application.

[0201] like Figure 15 As shown, the method for manufacturing a single battery cell according to an embodiment of this application includes:

[0202] S100, providing a housing and electrode terminals, wherein the outer surface of the housing has a recess, and at least a portion of the electrode terminals is accommodated within the recess;

[0203] S200, provides electrode assemblies;

[0204] S300: Install the electrode assembly inside the housing and connect the electrode terminals to the electrode assembly to discharge the electrical energy from the electrode assembly;

[0205] The recess is used to accommodate at least a portion of the battery's busbar component, which is used to connect the electrode terminals of multiple battery cells to electrically connect the multiple battery cells.

[0206] It should be noted that the relevant structure of the battery cell manufactured by the above-described battery cell manufacturing method can be found in the battery cells provided in the above embodiments.

[0207] When manufacturing a battery cell based on the above-described method, the steps do not necessarily need to be performed sequentially. That is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously. For example, steps S100 and S200 can be performed concurrently without any order.

[0208] Figure 16 This is a schematic flowchart illustrating a method for manufacturing a battery cell according to some embodiments of this application.

[0209] like Figure 16 As shown, the battery cell manufacturing system 90 of this application embodiment includes:

[0210] A first providing device 91 is used to provide a housing and electrode terminals, wherein the outer surface of the housing is provided with a recess, and at least a portion of the electrode terminals is accommodated in the recess;

[0211] The second providing device 92 is used to provide the electrode assembly;

[0212] Assembly device 93 is used to install the electrode assembly inside the housing and to connect the electrode terminals to the electrode assembly so as to conduct electrical energy from the electrode assembly;

[0213] The recess is used to accommodate at least a portion of the battery's busbar component, which is used to connect the electrode terminals of multiple battery cells to electrically connect the multiple battery cells.

[0214] The relevant structure of the battery cell manufactured by the above manufacturing system can be found in the battery cells provided in the above embodiments.

[0215] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0216] 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 modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to 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 single battery cell, comprising: The outer shell includes two first surfaces arranged opposite each other along a first direction, two second surfaces arranged opposite each other along a second direction, and two third surfaces arranged opposite each other along a third direction. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface. The first direction, the second direction, and the third direction are perpendicular to each other. The outer shell is provided with a recess, and the recess is recessed relative to the first surface. Electrode assembly, housed within the housing; as well as The electrode terminal is used to electrically connect with the electrode assembly to conduct electrical energy from the electrode assembly. The electrode terminal includes a first electrode terminal and a second electrode terminal with opposite polarities. At least a portion of the first electrode terminal and at least a portion of the second electrode terminal are accommodated in the recess. The first electrode terminal and the second electrode terminal are correspondingly arranged along the second direction. The recess extends continuously along the second direction, and both ends of the recess extend to the two second surfaces respectively along the second direction. Along the third direction, the recess and the third surface are spaced apart. The recess is used to accommodate at least a portion of the battery's busbar component. The busbar component is used to connect the electrode terminals of a plurality of battery cells to electrically connect the plurality of battery cells.

2. The battery cell according to claim 1, wherein, The portion of the electrode terminal located on the outside of the housing is completely accommodated within the recess.

3. The battery cell according to claim 1, wherein, The recess is located in the middle of the outer casing along the third direction.

4. The battery cell according to claim 1, wherein, The electrode assembly includes a main body, a first electrode tab, and a second electrode tab, wherein the first electrode tab and the second electrode tab extend from the main body and have opposite polarities; The recess has a bottom surface parallel to the first surface. In the first direction, the bottom surface of the recess overlaps with the first tab and the bottom surface of the recess overlaps with the second tab.

5. The battery cell according to claim 1, wherein, The area of ​​the second surface is greater than the area of ​​the third surface.

6. A battery, comprising: Multiple battery cells according to any one of claims 1-5; A busbar for connecting the electrode terminals of a plurality of battery cells to electrically connect the plurality of battery cells, wherein the recess of the battery cells is used to receive at least a portion of the busbar.

7. The battery according to claim 6, wherein, The busbar component is housed entirely within the space formed by the recesses of the multiple battery cells.

8. The battery according to claim 6, wherein, Multiple battery cells are arranged along the first direction.

9. The battery according to claim 6, wherein, The current-combining component includes a first current-combining section, a second current-combining section, and a third current-combining section. The first current-combining section is used to extend into the recess of one of the battery cells and connect to the first electrode terminal. The second current-combining section is used to extend into the recess of another battery cell and connect to the second electrode terminal. The third current-combining section connects the first current-combining section and the second current-combining section.

10. The battery according to claim 9, wherein, Along the second direction, the third busbar is located on one side of the other battery cell.

11. An electrical device comprising a battery cell according to any one of claims 1-5, the battery cell being used to provide electrical energy.

12. A method for manufacturing a single battery cell, comprising: A housing and electrode terminals are provided. The housing includes two first surfaces disposed opposite to each other along a first direction, two second surfaces disposed opposite to each other along a second direction, and two third surfaces disposed opposite to each other along a third direction. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the third surface is greater than the area of ​​the third surface. The first direction, the second direction, and the third direction are perpendicular to each other. The housing has a recess that is recessed relative to the first surface. The electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities. At least a portion of the first electrode terminal and at least a portion of the second electrode terminal are accommodated in the recess. The first electrode terminal and the second electrode terminal are disposed correspondingly along the second direction. Provide electrode assemblies; The electrode assembly is installed inside the housing, and the electrode terminals are connected to the electrode assembly to discharge the electrical energy of the electrode assembly; The recess extends continuously along the second direction, and both ends of the recess extend to the two second surfaces respectively along the second direction. Along the third direction, the recess and the third surface are spaced apart. The recess is used to accommodate at least a portion of the battery's busbar component. The busbar component is used to connect the electrode terminals of a plurality of battery cells to electrically connect the plurality of battery cells.

13. A manufacturing system for a single battery cell, comprising: A first providing device is used to provide a housing and electrode terminals. The housing includes two first surfaces disposed opposite to each other along a first direction, two second surfaces disposed opposite to each other along a second direction, and two third surfaces disposed opposite to each other along a third direction. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface. The first direction, the second direction, and the third direction are perpendicular to each other. The housing has a recess that is recessed relative to the first surface. The electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities. At least a portion of the first electrode terminal and at least a portion of the second electrode terminal are accommodated in the recess. The first electrode terminal and the second electrode terminal are disposed correspondingly along the second direction. A second providing device is used to provide electrode assemblies; An assembly device for mounting the electrode assembly inside the housing and connecting the electrode terminals to the electrode assembly to discharge electrical energy from the electrode assembly; The recess extends continuously along the second direction, and both ends of the recess extend to the two second surfaces respectively along the second direction. Along the third direction, the recess and the third surface are spaced apart. The recess is used to accommodate at least a portion of the battery's busbar component. The busbar component is used to connect the electrode terminals of a plurality of battery cells to electrically connect the plurality of battery cells.

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