Battery, electric device, method and apparatus for preparing battery cell

Abstract

Embodiments of the present application provide a battery, an electric device, a method and an apparatus for preparing a battery cell, which have higher space utilization. The battery comprises a plurality of battery cells, a first region of an edge of a first surface of each battery cell of the plurality of battery cells is recessed to form a first recess, a first electrode terminal of the battery cell is protrudingly arranged on a second surface of the battery cell, the first surface and the second surface are perpendicular to a first direction; a first busbar component is configured to connect the first electrode terminal of an adjacent first battery cell and a second battery cell, the first busbar component bypasses a side wall of the second battery cell parallel to the first direction, such that a first end of the first busbar component is connected to the first electrode terminal of the first battery cell, a second end of the first busbar component is connected to the first electrode terminal of the second battery cell, and the first end of the first busbar component and the first electrode terminal of the first battery cell are jointly accommodated in the first recess of the second battery cell.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] To adapt to people's fast-paced travel habits, batteries need to meet the demands of fast charging during use. This necessitates increasing the capacity of individual battery cells, which may alter their size and require more storage space. Therefore, improving the space utilization rate of individual battery cells has become a problem that needs to be solved. Summary of the Invention

[0004] This application provides a battery, an electrical device, a method and apparatus for preparing battery cells, which can improve the space utilization of battery cells.

[0005] In a first aspect, a battery is provided, comprising:

[0006] A plurality of battery cells are arranged along a first direction. A first recess is formed in a first region at the edge of the first surface of each of the plurality of battery cells. A first electrode terminal of each of the battery cells protrudes from the second surface of the battery cell. The first surface and the second surface are perpendicular to the first direction. The plurality of battery cells include adjacent first battery cells and second battery cells.

[0007] A first busbar is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell parallel to the first direction, such that a first end of the first busbar is connected to the first electrode terminal of the first battery cell, and a second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together housed in the first recess of the second battery cell.

[0008] Based on this technical solution, since each battery cell has a first recess on the edge of its first surface and a first electrode terminal protruding from a second surface opposite to the first surface, when multiple battery cells are arranged along the protruding direction of the first electrode terminal, the first recess of the second battery cell in two adjacent battery cells can accommodate the first electrode terminal of the first battery cell and a first busbar for connecting the two battery cells. This first busbar can bypass the sidewall of the second battery cell, so that its first end is connected to the first electrode terminal of the first battery cell, and its second end is also connected to the first electrode terminal of the second battery cell. Because multiple battery cells are arranged along the protruding direction of their respective first electrode terminals, and the first electrode terminals are accommodated within the first recesses of adjacent battery cells, the first electrode terminals do not need to occupy additional space, thus improving the space utilization rate of the battery cells.

[0009] In one possible implementation, the first busbar includes a first end, a second end, and a bend located between the first end and the second end, the bend being configured to bend so that the first busbar bypasses a sidewall of the second battery cell parallel to the first direction.

[0010] In this embodiment, since a bending portion is provided on the first busbar component, the first busbar component can more easily bypass the sidewall of the battery cell during the assembly process of multiple battery cells, which facilitates the installation of the first busbar component.

[0011] In one possible implementation, the bending portion includes a first bending region, a second bending region, and an intermediate region, wherein the first bending region is used for bending to connect the first end and the intermediate region, and the second bending region is used for bending to connect the second end and the intermediate region.

[0012] In one possible implementation, the thickness of the first bending region and the thickness of the second bending region are less than the thickness of the intermediate region.

[0013] In this embodiment, since the thickness of the first bending region and the thickness of the second bending region of the bending portion of the first busbar component are less than the thickness of the middle region, it is equivalent to thinning the first bending region and the second bending region, making it easier to bend the first busbar component.

[0014] In one possible implementation, the intermediate region is perpendicular to the first surface and the second surface.

[0015] In this embodiment, since the middle region of the bend of the first busbar component is perpendicular to the first and second surfaces of the battery cell, the first busbar component occupies the least space in the direction perpendicular to the first and second surfaces, further improving the space utilization of the battery cell.

[0016] In one possible implementation, the intermediate region is provided with reinforcing ribs.

[0017] In this embodiment, a reinforcing rib is provided in the middle region of the bend of the first busbar component, thereby improving the strength of the first busbar component.

[0018] In one possible implementation, the reinforcing rib is parallel to the first direction.

[0019] In one possible implementation, an insulating layer is provided on the surface of the bent portion facing the second battery cell; or, the bent portion is wrapped with insulating material.

[0020] In this embodiment, the bent portion is provided with an insulating layer or wrapped with insulating material, which can prevent electrical contact between the first busbar component and the first electrode terminal of the battery cell, thereby improving the safety of the battery.

[0021] In one possible implementation, the insulating layer comprises an insulating patch or an insulating coating.

[0022] In one possible implementation, in the first direction, the size of the first recess is greater than the sum of the height of the first electrode terminal and the size of the first busbar.

[0023] In this embodiment, in order for the first recess of the battery cell to accommodate the first electrode terminal and the first busbar of the adjacent other battery cells, the size of the first recess is greater than the sum of the height of the first electrode terminal and the size of the first busbar.

[0024] In one possible implementation, in the first direction, the difference between the size of the battery cell and the size of the first recess of the battery cell is greater than or equal to 2 mm.

[0025] In this embodiment, along the first direction in which multiple battery cells are arranged, the size of the battery cell at the position corresponding to the first recess is greater than or equal to 2 mm, so as to ensure the accommodation space for components such as the adapter, plastic sheet, and electrode assembly inside the battery cell while meeting the size requirements of the first recess.

[0026] In one possible implementation, the dimension of the first recess on the first surface along a second direction is greater than or equal to 12 mm, the second direction being perpendicular to the third surface of the battery cell, the third surface being perpendicular to both the first and second surfaces.

[0027] In this embodiment, since space needs to be reserved for the first electrode terminal and its insulating edge, the riveting block of the battery cell, and the positioning of the riveting tool, the size of the first recess of the battery cell along the second direction on the first surface should be set within a reasonable range, for example, greater than or equal to 12 mm.

[0028] In one possible implementation, the battery cell includes a housing and an end cap, the housing for accommodating the electrode assembly of the battery cell, the end cap covering the housing to enclose the electrode assembly within the housing, the bottom wall of the housing forming the first surface of the battery cell, and the end cap forming the second surface of the battery cell.

[0029] In one possible implementation, the area of ​​the end cap corresponding to the electrode assembly protrudes in a direction away from the housing to form a groove on the side of the end cap facing the housing.

[0030] In one possible implementation, the groove is used to position the electrode assembly during assembly.

[0031] In one possible implementation, the outline between the raised area of ​​the end cap and the groove is used to position the welding trajectory during the welding process of the housing and the end cap.

[0032] In this embodiment, in the battery cell, the area on the end cap corresponding to the electrode assembly protrudes in a direction away from its housing, forming a groove on the side of the end cap facing the housing. This design not only allows the groove to position the electrode assembly during assembly, but also allows the contour line between the protruding area of ​​the end cap and the groove to position the welding trajectory during the welding of the housing and the end cap.

[0033] In one possible implementation, the depth of the groove is between 0.4 mm and 3 mm.

[0034] In this embodiment, the depth of the groove should not be too large to avoid affecting the position of the welding tool during the welding process. The depth of the groove should also not be too small, otherwise the above function cannot be achieved. Therefore, setting its depth between 0.4 and 3 mm is optimal.

[0035] In one possible implementation, the distance between the contour line and the welding trajectory is greater than 0.5 mm.

[0036] In one possible implementation, the size of the groove is greater than or equal to the size of the electrode assembly in a cross-section of a plane perpendicular to the first direction.

[0037] In one possible implementation, a second recess is formed in a second region at the edge of the first surface. The first region is located at a first end of the first surface in a second direction, and the second region is located at a second end of the first surface in the second direction. A second electrode terminal of each battery cell protrudes from the second surface of the battery cell, and the polarity of the second electrode terminal is opposite to that of the first electrode terminal. The plurality of battery cells also includes a third battery cell adjacent to the second battery cell. The battery also includes a second busbar for connecting the second electrode terminal of the second battery cell and the second electrode terminal of the third battery cell. The second busbar bypasses the sidewall of the third battery cell parallel to the first direction, such that a first end of the second busbar is connected to the second electrode terminal of the second battery cell, and a second end of the second busbar is connected to the second electrode terminal of the third battery cell. The first end of the second busbar and the second electrode terminal of the second battery cell are together accommodated in the second recess of the third battery cell.

[0038] In this embodiment, in addition to a first recess formed by a recess in a first region at the edge of the first surface of the battery cell, each battery cell also has a second recess and a second electrode terminal. The second recess is formed by a recess in the second region at the edge of the first surface of the battery cell, and the second electrode terminal protrudes from a second surface opposite to the first surface. Therefore, when multiple battery cells are arranged along the protruding direction of the second electrode terminal, the second recess of the third battery cell in two adjacent battery cells can accommodate the second electrode terminal of the second battery cell, as well as a second busbar for connecting the two battery cells. The second busbar can bypass the sidewall of the third battery cell, so that a first end of the second busbar is connected to the second electrode terminal of the second battery cell, and a second end is connected to the second electrode terminal of the third battery cell. Since multiple battery cells are arranged along the protruding direction of their respective second electrode terminals, and the second electrode terminals are accommodated within the second recesses of adjacent battery cells, the first electrode terminal does not need to occupy additional space, thus improving the space utilization rate of the battery cells.

[0039] In a second aspect, an electrical device is provided, comprising: a battery as described in the first aspect and any possible implementation thereof, the battery being used to provide electrical energy.

[0040] Thirdly, a method for preparing a battery cell is provided, including:

[0041] A plurality of battery cells are provided, the plurality of battery cells are arranged along a first direction, a first recess is formed in a first region of the edge of the first surface of each of the plurality of battery cells, a first electrode terminal of each of the battery cells is protruding from the second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells include adjacent first battery cells and second battery cells;

[0042] A first busbar is provided, which is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell parallel to the first direction, such that a first end of the first busbar is connected to the first electrode terminal of the first battery cell, and a second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together accommodated in the first recess of the second battery cell.

[0043] Fourthly, an apparatus for preparing battery cells is provided, including a providing module, the providing module being used for:

[0044] A plurality of battery cells are provided, the plurality of battery cells are arranged along a first direction, a first recess is formed in a first region of the edge of the first surface of each of the plurality of battery cells, a first electrode terminal of each of the battery cells is protruding from the second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells include adjacent first battery cells and second battery cells;

[0045] A first busbar is provided, which is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell parallel to the first direction, such that a first end of the first busbar is connected to the first electrode terminal of the first battery cell, and a second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together accommodated in the first recess of the second battery cell. Attached Figure Description

[0046] 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.

[0047] Figure 1 This is a schematic diagram of the structure of a vehicle disclosed in one embodiment of this application;

[0048] Figure 2 This is a schematic diagram of the structure of a battery disclosed in one embodiment of this application;

[0049] Figure 3 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0050] Figure 4 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram of the structure of a battery disclosed in one embodiment of this application;

[0052] Figure 6 This is a schematic diagram of a connection between adjacent battery cells via a busbar component, as disclosed in an embodiment of this application.

[0053] Figure 7 This is a schematic diagram of the structure of a busbar component disclosed in an embodiment of this application;

[0054] Figure 8 This is a schematic diagram of the structure of a busbar component disclosed in an embodiment of this application;

[0055] Figure 9 This is a schematic diagram of the structure of a busbar component disclosed in an embodiment of this application;

[0056] Figure 10 This is a schematic diagram of the structure of a busbar component disclosed in an embodiment of this application;

[0057] Figure 11 This is a dimensional schematic diagram of a busbar component disclosed in one embodiment of this application;

[0058] Figure 12 This is a dimensional schematic diagram of a busbar component disclosed in one embodiment of this application;

[0059] Figure 13 This is a schematic diagram of the structure of a battery cell disclosed in an embodiment of this application;

[0060] Figure 14This is a schematic diagram of a battery cell assembly process disclosed in an embodiment of this application;

[0061] Figure 15 This is a side view of a battery cell disclosed in an embodiment of this application;

[0062] Figure 16 This is a side view of a battery cell disclosed in an embodiment of this application;

[0063] Figure 17 This is a schematic diagram of the structure of a groove on the end cap of a battery cell disclosed in an embodiment of this application;

[0064] Figure 18 This is a schematic flowchart of a method for preparing a battery according to an embodiment of this application;

[0065] Figure 19 This is a schematic block diagram of an apparatus for preparing a battery according to an embodiment of this application;

[0066] The accompanying drawings are not drawn to scale. Detailed Implementation

[0067] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0069] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application based on 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] 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.

[0072] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0073] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0074] In this application, a battery refers to a physical module comprising one or more battery cells to provide electrical energy. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a casing for encapsulating one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] Optionally, a battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application embodiment is not limited thereto. In some embodiments, a battery cell may also be referred to as a battery cell.

[0076] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of 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 electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material 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 is coated on the surface of the negative current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be carried without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The diaphragm can be made of polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0077] To meet diverse power demands, multiple battery cells can be connected in series, parallel, or a combination thereof, with a combination of series and parallel connections. Optionally, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a battery. In other words, multiple battery cells can directly form a battery, or they can first be formed into battery modules, and then the battery modules can be combined into a battery. The battery is then further installed in electrical equipment to provide power to the equipment.

[0078] The battery casing may also include a signal transmission component. This component can be used to transmit signals such as voltage and / or temperature of individual battery cells. The signal transmission component may include a busbar for establishing electrical connections between multiple battery cells, such as in parallel, series, or mixed connections. The busbar can establish electrical connections between battery cells by connecting to the electrode terminals of the battery cells. In some embodiments, the busbar can be fixed to the electrode terminals of the battery cells by welding. The busbar transmits the voltage of the battery cells; when multiple battery cells are connected in series, a higher voltage is obtained. Accordingly, the electrical connection formed by the busbar can also be referred to as a "high-voltage connection."

[0079] In addition to the busbar component, the signal transmission assembly may also include sensors for sensing the state of individual battery cells. For example, the sensors may be used to measure and transmit sensing signals such as the temperature and state of charge of the individual battery cells. In embodiments of this application, the electrical connection components within the battery may include the busbar component and / or sensors.

[0080] The busbar and sensor can be encapsulated in an insulating layer to form a signal transmission assembly. Accordingly, the signal transmission assembly can be used to transmit the voltage and / or sensing signals of the battery cells. The signal transmission assembly does not have an insulating layer at the connection point with the electrode terminals of the battery cells; that is, the insulating layer has openings at this point for connection with the electrode terminals of the battery cells.

[0081] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, the space utilization of individual battery cells needs to be considered to reduce battery size and expand its application scenarios.

[0082] In view of this, this application provides a technical solution in which a recess is provided at the edge of the first surface of the battery cell, and the electrode terminals of the battery cell are disposed at corresponding positions on the second surface opposite to the first surface. For adjacent first and second battery cells, the recess of the second battery cell can be used to accommodate the electrode terminals of the first battery cell, so that the electrode terminals do not need to occupy additional space. Electrical connection between the two battery cells can be achieved simply by bypassing the sidewall of the second battery cell and connecting its two ends to the electrode terminals of the first and second battery cells respectively.

[0083] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0084] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0085] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery 10 can be installed inside vehicle 1. The controller 30 controls the battery 10 to supply power to the motor 40. For example, the battery 10 can be installed at the bottom, front, or rear of vehicle 1. The battery 10 can be used to power vehicle 1; for example, it can serve as the operating power source for the vehicle 1's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0086] Battery 10 may include multiple battery cells. For example, such as Figure 2 The diagram shown is a structural schematic of a battery 10 according to an embodiment of this application. The battery 10 may include at least one battery module 200. The battery module 200 includes multiple battery cells 20. The battery 10 may also include a housing 11, which has a hollow interior structure, and the multiple battery cells 20 are housed within the housing 11. Figure 2 As shown, the housing 11 may include two parts, referred to here as the first part 111 (upper housing) and the second part 112 (lower housing), which are fastened together. The shapes of the first part 111 and the second part 112 may be determined according to the shape of the combination of multiple battery cells 20, and at least one of the first part 111 and the second part 112 may have an opening. For example, as Figure 2 As shown, both the first part 111 and the second part 112 can be hollow cuboids, each with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 interlock to form a box 11 with a closed cavity. For example, unlike... Figure 2 As shown, in the first part 111 and the second part 112, only one can be a hollow cuboid with an opening, while the other can be plate-shaped to cover the opening. For example, if the second part 112 is a hollow cuboid with only one open face, and the first part 111 is plate-shaped, then the first part 111 covers the opening of the second part 112 to form a box 11 with a closed cavity, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the box 11 formed by the first part 111 and the second part 112.

[0087] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component for realizing electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing 11 via a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0088] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or a combination thereof to achieve a larger capacity or power. Since each battery 10 may contain a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements. A battery can include multiple battery modules, which can be connected in series, parallel, or a combination thereof.

[0089] As an example, such as Figure 3 The diagram shown is a structural schematic of a battery cell 20 according to an embodiment of this application. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and an end cap 212. The housing 211 and the end cap 212 form a casing or battery box 21. The walls of the housing 211 and the end cap 212 are both referred to as the walls of the battery cell 20. For a cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the assembled one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, that is, this plane does not have a wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open face, that is, the end face does not have a wall, allowing the inside and outside of the housing 211 to communicate. The end cap 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0090] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the end cap 212. The end cap 212 is typically flat, and the two electrode terminals 214 are fixed to the flat surface of the end cap 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, or a current collector 23, which is located between the end cap 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0091] like Figure 3 As shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab. The first tab 221a of one or more electrode assemblies 22 is connected to an electrode terminal via a connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive tab via a connecting member 23, and the negative electrode terminal 214b is connected to the negative tab via another connecting member 23.

[0092] In this battery cell 20, depending on actual usage requirements, the electrode assembly 22 can be configured as a single unit or multiple units, such as... Figure 3 As shown, the battery cell 20 contains four independent electrode assemblies 22.

[0093] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0094] The pressure relief mechanism 213 can be any possible pressure relief structure, and the embodiments of this application are not limited to this. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0095] It should be understood that the battery 10 in this embodiment includes multiple battery cells 20 that can be arranged and placed in any direction within the housing 11. For example, as shown in... Figure 3 Taking the rectangular battery cell 20 shown as an example, as Figure 2 As shown, multiple battery cells 20 can be arranged as follows Figure 3The cells are installed vertically inside the housing 11, such that the end caps 212 of the installed battery cells 20 face upwards towards the housing, while the bottom wall of the housing 211 of the battery cells 20 faces downwards towards the housing. For example, with... Figure 2 Different, and can also include multiple such Figure 3 The battery cell 20 shown is arranged horizontally inside the housing 11.

[0096] The above Figure 3 During the assembly process, the square battery cells 20 shown are prone to misalignment when subjected to external forces such as impacts. This causes the busbar component to pull on the electrode terminals 214 of the battery cells 20, and the large sidewall area of ​​the battery cells 20 makes them susceptible to deformation. To address this, the shape of the battery cells 20 can be made blade-like, increasing their length. This allows the casing 211 of the battery cells 20 to provide some support and share some of the force. Furthermore, the electrode terminals 214 can be positioned at the ends of the battery cells 20 along their length to reduce the pulling on the electrode terminals 214 by the busbar component.

[0097] With a fixed energy density for the battery cell 20, as the length of the battery cell 20 increases, its thickness must decrease, resulting in a flatter battery cell 20. This is to prevent excessive overcurrent at the electrode terminals due to excessive capacity, which could cause the heat generated at the electrode terminals to exceed the operating temperature requirements of the battery cell 20. Because the thickness of the battery cell 20 decreases, the size of the electrode terminals 214 at the ends of the battery cell 20 is limited. If the size of the electrode terminals 214 is too small, it will be unable to meet the overcurrent requirements.

[0098] Therefore, embodiments of this application may employ the following methods: Figure 4 The blade-shaped battery cell 20 is shown. (Example) Figure 4 As shown, the battery cell 20 includes a first surface 251, a second surface 252, and a first electrode terminal 214a. A first recess 241 is formed by a recess in a first region at the edge of the first surface 251, and the second surface 252 is used to provide the first electrode terminal 214a of the battery cell 20, wherein the first surface 251 and the second surface 252 are perpendicular to a first direction X. In the first direction X, the first electrode terminal 214a protrudes from the second surface 252 of the battery cell 20 and is directly opposite the first recess 241. Figure 4 The positions of the positive electrode terminal 214a and the negative electrode terminal 214b can be interchanged. Hereinafter, as an example, the electrode terminal at the corresponding position of the first recess 241 is described as the positive electrode terminal 214a.

[0099] The first surface 251 may be the bottom wall of the housing 211 of the battery cell 20, and a first region of the first surface 251 is located at one edge of the battery cell 20 in the X direction. The second surface 252 may be the surface of the end cap 212 of the battery cell. Optionally, the depth of the first recess 241 in the first direction X is greater than the height of the electrode terminal, and the area of ​​the projection of the first recess 241 onto the first surface 251 is greater than the area of ​​the projection of the first electrode terminal 214a onto the first surface 251. In this way, the first recess 241 can accommodate the first electrode terminal 214a of another battery cell 20 disposed adjacent to the battery cell 20 in the first direction.

[0100] Specifically, such as Figure 5 The image shown is a side view of a battery 10 according to an embodiment of this application. The battery 10 includes a plurality of battery cells 20, such as adjacent first battery cells 201 and second battery cells 202. The plurality of battery cells 20 are arranged along a first direction X, and a first recess 241 is formed by a first region recessed at the edge of the first surface 251 of each battery cell 20. A first electrode terminal 214a of each battery cell 20 protrudes from the second surface 252 of the battery cell 20. Here, the protruding direction of the first electrode terminal 214a is the first direction X.

[0101] Battery 10 also includes a first busbar component 26, which is used to electrically connect the first electrode terminals 214a of two adjacent battery cells 20. For example, the busbar component 26 between the first battery cell 201 and the second battery cell 202 is used to electrically connect the first electrode terminals 214a of the first battery cell 201 and the first electrode terminals 214a of the second battery cell 202. Figure 6 As shown, the first busbar component 26 bypasses the sidewall of the second battery cell 202 parallel to the first direction X, such that the first end 261 of the first busbar component 26 is connected to the first electrode terminal 214a of the first battery cell 201, and the second end 262 of the first busbar component 26 is connected to the first electrode terminal 214a of the second battery cell 202. The first end 261 of the first busbar component 26 and the first electrode terminal 214a of the first battery cell 201 are together accommodated in the first recess 241 of the second battery cell 202.

[0102] Since each battery cell 20 has a first recess 241 on the edge of its first surface 251, and the first electrode terminal 214a of the battery cell 20 protrudes from the second surface 252 opposite to the first surface 251, when multiple battery cells 20 are arranged along the protruding direction of the first electrode terminal 214a, the first recess 241 of the second battery cell 202 in two adjacent battery cells can accommodate the first electrode terminal 214a of the first battery cell 201, and also accommodate the first busbar 26 for connecting the two battery cells 20. The first busbar 26 can bypass the sidewall of the second battery cell 202, such that the first end 261 of the first busbar 26 is connected to the first electrode terminal 214a of the first battery cell 201, and the second end 262 is connected to the first electrode terminal 214a of the second battery cell 202. Since multiple battery cells 20 are arranged along the protruding direction X of their respective first electrode terminals 214a, and the first electrode terminals 214a are accommodated in the first recesses 241 of adjacent battery cells 20, they do not occupy module assembly space, thus improving the space utilization of battery cells 20.

[0103] In one implementation, such as Figure 7 As shown, the first busbar component 26 includes a first end 261, a second end 262, and a bend 263 located between the first end 261 and the second end 262. The bend 263 is configured to be bendable so that the first busbar component 26 can bypass the sidewall of the second battery cell 202 parallel to the first direction X.

[0104] Thus, since the bending portion 263 is provided on the first busbar component 26, the first busbar component 26 can more easily bypass the side wall of the battery cell 20 during the assembly process of multiple battery cells 20, which facilitates the installation of the first busbar component 26.

[0105] In one implementation, such as Figure 7 As shown, the bending portion 263 includes a first bending region 2631, a second bending region 2632, and an intermediate region 2633. The first bending region 2631 is used for bending to connect the first end 261 and the intermediate region 2633, and the second bending region 2632 is used for bending to connect the second end 262 and the intermediate region 2633.

[0106] In one implementation, such as Figure 7As shown, the thickness of the first bending region 2631 and the thickness of the second bending region 2632 are less than the thickness of the intermediate region 2633. Thus, since the thickness of the first bending region 2631 and the thickness of the second bending region 2632 of the bending portion 263 of the first busbar component 26 are less than the thickness of the intermediate region 2633, it is equivalent to thinning the first bending region 2631 and the second bending region 2632, making it easier to bend the first busbar component 26.

[0107] In one implementation, the intermediate region 2633 is perpendicular to the first surface 251 and the second surface 252 of the battery cell 20. Since the intermediate region of the bent portion of the first busbar 26 is perpendicular to the first surface 251 and the second surface 252 of the battery cell 20, the first busbar 26 occupies minimal space in the direction perpendicular to the first surface 251 and the second surface 252, further improving the space utilization of the battery cell.

[0108] Furthermore, such as Figure 8 As shown, a reinforcing rib 264 may be provided on the intermediate region 2633 to improve the strength of the first busbar component 26. The reinforcing rib 264 may, for example, be parallel to the first direction X.

[0109] In one implementation, such as Figure 9 As shown, an insulating layer 265 is provided on the surface of the bent portion 263 facing the battery cell 20. This insulating layer may be, for example, an insulating patch or an insulating coating; or, in another implementation, such as Figure 10 As shown, the bent portion 263 is wrapped with insulating material 266. Since the bent portion 263 is provided with an insulating layer 265 or wrapped with insulating material 266, electrical contact between the first busbar 26 and the first electrode terminal 214a of the battery cell 20 can be avoided, thus improving the safety of the battery 10.

[0110] In one implementation, such as Figure 11 As shown, in the first direction X, the size H1 of the first recess 241 is greater than the sum of the height H3 of the first electrode terminal 214a and the size H2 of the first busbar component 26, so that the first recess 241 of the battery cell 20 can accommodate the first electrode terminal 214a and the first busbar component 26 of the adjacent other battery cells 20.

[0111] For example, in the first direction X, the difference between the dimension H0 of the battery cell 20 (excluding the height H3 of the first electrode terminal 214a) and the dimension H2 of the first recess 241 of the battery cell 20 can be greater than or equal to 2 mm, i.e., H0-H1>2 mm. In this way, in the first direction X, when the dimension of the battery cell 20 at the position corresponding to the first recess 241 is greater than or equal to 2 mm, it is possible to ensure the accommodation space for components such as the adapter, plastic sheet, and electrode assembly 22 inside the battery cell 20 while meeting the size requirements of the first recess 241.

[0112] For example, such as Figure 12 As shown, the first recess 241 has a dimension L0 along the second direction Y on the first surface 251 that is greater than or equal to 12 mm. The second direction Y is perpendicular to the third surface 253 of the battery cell 20, and the third surface 253 is perpendicular to the first surface 251 and the second surface 252.

[0113] In the second direction Y, space is required for the first electrode terminal 214a and its insulating edging, the riveting block 28 of the battery cell 20, and the positioning of the riveting tool. Therefore, the dimension of the first recess 241 of the battery cell 20 along the second direction Y on the first surface 251 should be set within a reasonable range, for example, greater than or equal to 12 mm. Typically, to ensure the overcurrent requirements of the first electrode terminal 214a, the diameter D of the first electrode terminal 214a usually satisfies D≥5 mm. The single-sided dimension of the riveting block 28 in the second direction Y can be set, for example, L1≥2-3 mm; the single-sided thickness of the insulating edging used to wrap the first electrode terminal 214a can be set, for example, L2≥0.6 mm; and the single-sided gap of the riveting fixture during positioning can be set, for example, L3≥1 mm. Therefore, the dimension L0 of the first recess 241 along the second direction Y typically needs to be greater than 5+(2+0.6+1)*2=12.2 mm.

[0114] For example, such as Figure 12 As shown, the dimension L4 of the first recess 241 along the third direction Z on the first surface 251 is greater than or equal to 15 mm, in order to meet the requirements such as the spacing between the two first electrode terminals 214a and the thickness of the insulation edging of each first electrode terminal 214a.

[0115] In one implementation, such as Figure 13As shown, a second recess 242 is formed in the second region of the edge of the first surface 251 of each battery cell 20. The first region is located at the first end of the first surface 251 in the second direction Y, and the second region is located at the second end of the first surface 251 in the second direction Y. A second electrode terminal 214b of each battery cell 20 protrudes from the second surface 252 of the battery cell 20, and the polarity of the second electrode terminal 214b is opposite to that of the first electrode terminal 214a. Figure 13 The positions of the positive electrode terminal 214a and the negative electrode terminal 214b can be interchanged. In this application, the electrode terminal at the corresponding position of the second recess 242 is described as the negative electrode terminal 214b.

[0116] like Figure 14 As shown, the plurality of battery cells 20 also includes a third battery cell 203 adjacent to the second battery cell 202. The battery 10 also includes a second busbar 27, which is used to connect the second electrode terminal 214b of the second battery cell 202 and the second electrode terminal 214b of the third battery cell 203. Similarly, the second busbar 27 eventually bypasses the sidewall of the third battery cell 203 parallel to the first direction X, such that the first end of the second busbar 27 is connected to the second electrode terminal 214b of the second battery cell 202, and the second end of the second busbar 27 is connected to the second electrode terminal 214b of the third battery cell 203. The first end of the second busbar 27 connected to the second battery cell 202 and the second electrode terminal 214b of the second battery cell 202 are together accommodated in the second recess 242 of the third battery cell 203.

[0117] It should be understood that the specific details of the second recess 242 and the second busbar component 27 can be found in the foregoing descriptions of the first recess 241 and the first busbar component 26, and will not be repeated here for the sake of brevity. A first electrode terminal is provided on the second surface 252 of the battery cell 20 at a position corresponding to the first recess 241, and a second electrode terminal is provided on the second surface 252 of the battery cell 20 at a position corresponding to the second recess 242. The first electrode terminal and the second electrode terminal can be a positive electrode terminal 214a and a negative electrode terminal 214b, respectively, or the first electrode terminal and the second electrode terminal can be a negative electrode terminal 214b and a positive electrode terminal 214a, respectively.

[0118] The following describes the assembly process of multiple battery cells 20, taking the connection between the first electrode terminal 214a of the first battery cell 201 and the second battery cell 202 as an example. After the first battery cell 201 is assembled, the first end 261 of the first busbar 26 is welded to the corresponding first electrode terminal 214a on the second surface 252 of the first battery cell 201. Next, the second surface 252 of the second battery cell 202 is stacked towards the first surface of the first battery cell 201, and the first electrode terminal 214a of the first battery cell 201 is accommodated in the first recess 241 of the second battery cell 202. Then, the first busbar 26 is bent around the sidewall of the second battery cell 202 parallel to the first direction X, and the second end 262 of the first busbar 26 is welded to the first electrode terminal 214a of the second battery cell 202. In this way, the electrical connection between the first electrode terminal 214a of the first battery cell 201 and the second battery cell 202 is completed. Similarly, electrical connections can also be made between the second electrode terminals 214b of adjacent second battery cells 202 and third battery cells 203. Multiple battery cells 20 are grouped together in a similar manner to form a battery 10.

[0119] In one implementation, see Figures 15 to 17 ,in Figure 16 yes Figure 15 The diagram shows a cross-sectional view of a single battery cell along the AA direction, which is the second direction Y. Figure 17 yes Figure 16 A partial enlarged view of region B in the diagram. The region of the end cap 212 of the battery cell 20 corresponding to the electrode assembly 22 protrudes in a direction away from the housing 211 to form a groove 2121 on the side of the end cap 212 facing the housing 211.

[0120] The groove 2121 can be used to position the electrode assembly 22 during assembly. Furthermore, the contour line 2122 between the raised area of ​​the end cap 212 and the groove 2121 is used to position the welding trajectory during the welding of the housing 211 and the end cap 212.

[0121] Optionally, in a cross-section of a plane perpendicular to the first direction X, the size of the groove 2121 is greater than or equal to the size of the electrode assembly 22, so that the electrode assembly 22 can be accommodated within the groove 2121.

[0122] like Figure 17 As shown, the depth R1 of the groove 2121 in the first direction X is, for example, between 0.4 mm and 3 mm. The depth of the groove 2121 cannot be too large to avoid affecting the position of the welding tool during the welding process, nor can the depth of the groove 2121 be too small, otherwise the above function cannot be achieved. Therefore, setting its depth between 0.4 and 3 mm is optimal.

[0123] like Figure 17 As shown, the distance R2 between the contour line 2122 and the welding trajectory can be greater than 0.5 mm, for example, to allow for the position of the welding tool during the welding process, so as not to affect the positioning requirements of the laser welding lens.

[0124] As can be seen, in the battery cell 20, the area on the end cap 212 corresponding to the electrode assembly 22 protrudes in a direction away from its housing 211, forming a groove 2121 on the side of the end cap 212 facing the housing 211. This design not only allows the groove 2121 to position the electrode assembly 22 during assembly, but also allows the contour line 2122 between the protruding area of ​​the end cap 212 and the groove 2121 to position the welding trajectory during the welding of the housing 211 and the end cap 212.

[0125] One embodiment of this application also provides an electrical device that may include the battery 10 from the foregoing embodiments for providing electrical power to the device. Optionally, the electrical device may be a vehicle, a ship, or a spacecraft.

[0126] By incorporating the battery 10 of the aforementioned embodiment into the electrical equipment, space is saved and space utilization is improved, as the electrode terminals of the battery cells 20 in the battery 10 are accommodated in the recesses of adjacent battery cells, thus facilitating the promotion and use of the electrical equipment.

[0127] The foregoing described the battery and electrical device of the present application embodiments. The following will describe the method and apparatus for preparing the battery of the present application embodiments, wherein parts not described in detail can be referred to the foregoing embodiments.

[0128] Figure 18 A schematic flowchart of a method 300 for preparing a battery according to an embodiment of this application is shown. Figure 18 As shown, the method 300 may include:

[0129] Step 310: Provide a plurality of battery cells 20, which are arranged along a first direction X. A first recess 241 is formed in a first region of the edge of the first surface 251 of each battery cell 20. A first electrode terminal 214a of each battery cell 20 protrudes from the second surface 252 of the battery cell 20. The first surface 251 and the second surface 252 are perpendicular to the first direction X. The plurality of battery cells 20 includes adjacent first battery cells 201 and second battery cells 202. Step 320: Provide a first busbar 26 for connecting the first battery cells. The first electrode terminal 214a of the battery cell 201 and the first electrode terminal 214a of the battery cell 202 are connected together. The first busbar 26 bypasses the sidewall of the second battery cell 202 parallel to the first direction X, such that the first end 261 of the first busbar 26 is connected to the first electrode terminal 214a of the first battery cell 201, and the second end 262 of the first busbar 26 is connected to the first electrode terminal 214a of the second battery cell 202. The first end 261 of the first busbar 26 and the first electrode terminal 214a of the first battery cell 201 are together accommodated in the first recess 241 of the second battery cell 202.

[0130] Figure 19 A schematic block diagram of a battery manufacturing apparatus 400 according to one embodiment of this application is shown. Figure 19 As shown, the battery manufacturing apparatus 400 may include a providing module 410 for: providing a plurality of battery cells 20, including adjacent first battery cells 201 and second battery cells 202, the plurality of battery cells 20 being arranged along a first direction X, a first recess 241 being formed in a first region of the edge of the first surface 251 of each of the plurality of battery cells 20, and a first electrode terminal 214a protruding from the second surface 252 of each of the battery cells 20, the first surface 251 and the second surface 252 being perpendicular to the first direction X, the plurality of battery cells 20 including adjacent first battery cells 201 and second battery cells 202; and providing a first busbar component. 26. The first busbar component 26 is used to connect the first electrode terminal 214a of the first battery cell 201 and the first electrode terminal 214a of the second battery cell 202. The first busbar component 26 bypasses the side wall of the second battery cell 202 parallel to the first direction X, such that the first end 261 of the first busbar component 26 is connected to the first electrode terminal 214a of the first battery cell 201, and the second end 262 of the first busbar component 26 is connected to the first electrode terminal 214a of the second battery cell 202. The first end 261 of the first busbar component 26 and the first electrode terminal 214a of the first battery cell 201 are together accommodated in the first recess 241 of the second battery cell 202.

[0131] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, include: A plurality of battery cells are arranged along a first direction. A first recess is formed in a first region at the edge of the first surface of each of the plurality of battery cells. A first electrode terminal of each of the battery cells protrudes from the second surface of the battery cell. The first surface and the second surface are perpendicular to the first direction. The plurality of battery cells include adjacent first battery cells and second battery cells. A first busbar is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell that is parallel to the first direction, such that the first end of the first busbar is connected to the first electrode terminal of the first battery cell, and the second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together accommodated in the first recess of the second battery cell. In the first direction, the difference between the size of the battery cell and the size of the first recess of the battery cell is greater than or equal to 2 mm.

2. The battery according to claim 1, characterized in that, The first busbar includes a first end, a second end, and a bend located between the first end and the second end, the bend being configured to be bend so that the first busbar bypasses the sidewall of the second battery cell parallel to the first direction.

3. The battery according to claim 2, characterized in that, The bending portion includes a first bending region, a second bending region, and an intermediate region, wherein the first bending region is used for bending to connect the first end and the intermediate region, and the second bending region is used for bending to connect the second end and the intermediate region.

4. The battery according to claim 3, characterized in that, The thickness of the first bending region and the thickness of the second bending region are less than the thickness of the intermediate region.

5. The battery according to claim 3, characterized in that, The intermediate region is perpendicular to the first surface and the second surface.

6. The battery according to claim 3, characterized in that, The middle area is provided with reinforcing ribs.

7. The battery according to claim 6, characterized in that, The reinforcing rib is parallel to the first direction.

8. The battery according to claim 2, characterized in that, An insulating layer is provided on the surface of the bent portion facing the second battery cell; or, The bent portion is wrapped with insulating material.

9. The battery according to claim 8, characterized in that, The insulating layer includes insulating patches or insulating coatings.

10. The battery according to claim 1, characterized in that, In the first direction, the size of the first recess is greater than the sum of the height of the first electrode terminal and the size of the first busbar component.

11. The battery according to claim 1, characterized in that, The dimension of the first recess on the first surface along the second direction is greater than or equal to 12 mm, the second direction being perpendicular to the third surface of the battery cell, and the third surface being perpendicular to the first surface and the second surface.

12. The battery according to claim 1, characterized in that, The battery cell includes a housing and an end cap. The housing is used to accommodate the electrode assembly of the battery cell, and the end cap covers the housing to enclose the electrode assembly within the housing. The bottom wall of the housing forms the first surface of the battery cell, and the end cap forms the second surface of the battery cell.

13. The battery according to claim 12, characterized in that, The area of ​​the end cap corresponding to the electrode assembly protrudes in a direction away from the housing to form a groove on the side of the end cap facing the housing.

14. The battery according to claim 13, characterized in that, The groove is used to position the electrode assembly during assembly.

15. The battery according to claim 13, characterized in that, The outline between the raised area of ​​the end cap and the groove is used to position the welding trajectory during the welding process of the housing and the end cap.

16. The battery according to claim 13, characterized in that, The depth of the groove is between 0.4 mm and 3 mm.

17. The battery according to claim 15, characterized in that, The distance between the outline and the welding trajectory is greater than 0.5 mm.

18. The battery according to claim 13, characterized in that, In a cross-section of a plane perpendicular to the first direction, the size of the groove is greater than or equal to the size of the electrode assembly.

19. The battery according to any one of claims 1 to 18, characterized in that, A second recess is formed in a second region at the edge of the first surface. The first region is located at a first end of the first surface in a second direction, and the second region is located at a second end of the first surface in the second direction. A second electrode terminal of each battery cell protrudes from the second surface of the battery cell, and the polarity of the second electrode terminal is opposite to that of the first electrode terminal. The plurality of battery cells further includes a third battery cell adjacent to the second battery cell, and the battery further includes: A second busbar is used to connect the second electrode terminal of the second battery cell and the second electrode terminal of the third battery cell. The second busbar bypasses the sidewall of the third battery cell parallel to the first direction, such that the first end of the second busbar is connected to the second electrode terminal of the second battery cell, and the second end of the second busbar is connected to the second electrode terminal of the third battery cell. The first end of the second busbar and the second electrode terminal of the second battery cell are together accommodated in the second recess of the third battery cell.

20. An electrical appliance, characterized in that, include: The battery according to any one of claims 1-19 is used to provide electrical energy.

21. A method for preparing a battery cell, characterized in that, include: A plurality of battery cells are provided, the plurality of battery cells are arranged along a first direction, a first recess is formed in a first region of the edge of the first surface of each of the plurality of battery cells, a first electrode terminal of each of the battery cells is protruding from the second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells include adjacent first battery cells and second battery cells; A first busbar is provided, which is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell parallel to the first direction, such that a first end of the first busbar is connected to the first electrode terminal of the first battery cell, and a second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together accommodated in the first recess of the second battery cell. In the first direction, the difference between the size of the battery cell and the size of the first recess of the battery cell is greater than or equal to 2 mm.

22. An apparatus for preparing battery cells, characterized in that, Includes a providing module, the providing module being used for: A plurality of battery cells are provided, the plurality of battery cells are arranged along a first direction, a first recess is formed in a first region of the edge of the first surface of each of the plurality of battery cells, a first electrode terminal of each of the battery cells is protruding from the second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells include adjacent first battery cells and second battery cells; A first busbar is provided, which is used to connect the first electrode terminal of the first battery cell and the first electrode terminal of the second battery cell. The first busbar bypasses the sidewall of the second battery cell parallel to the first direction, such that a first end of the first busbar is connected to the first electrode terminal of the first battery cell, and a second end of the first busbar is connected to the first electrode terminal of the second battery cell. The first end of the first busbar and the first electrode terminal of the first battery cell are together accommodated in the first recess of the second battery cell. In the first direction, the difference between the size of the battery cell and the size of the first recess of the battery cell is greater than or equal to 2 mm.

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