Battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), and an electric device. The electric device comprises the battery cell (10) and the battery (100), wherein the battery (100) comprises battery cells (10), and the battery cells (10) each comprise a casing (12) and an electrode assembly (11). At least part of the casing (12) is a steel casing, and the casing (12) comprises a body (121) and a bottom (122). The bottom (122) is formed at one end of the body (121) in a first direction (Z), and is separated from or integrated with the body (121). At least part of the body (121) is welded. At least part of the electrode assembly (11) is provided in a space defined by the body (121) and the bottom (122). Therefore, the wall thickness of the casing (12) can be reduced while the structural strength of the battery cell (10) is relatively high, thereby reducing the proportion of the casing (12) in the battery cell (10), and achieving high energy density of the battery cell (10).

Description

Battery cells, batteries and electrical devices

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on November 2, 2023, with application number 202322955803.X and application name "Battery Cell, Battery and Electrical Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In the related art, a battery cell may generally include a shell, an electrode assembly, and an end cover, wherein the electrode assembly is disposed in an internal environment defined by the shell and the end cover.

[0005] In some cases, to ensure greater structural strength of the battery cell as a whole, the shell is usually provided with a thicker wall. As a result, the shell occupies a larger proportion of the battery cell, which limits the energy density of the battery cell to a certain extent.

[0006] Summary of the Invention

[0007] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, which can improve the technical problem of limited energy density of the battery cell.

[0008] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0009] The shell is at least partially made of steel; the shell includes a shell body and a shell bottom, the shell bottom is arranged at one end of the shell body along the first direction, and is separately connected to the shell body or integrally connected to the shell body;

[0010] The electrode assembly is at least partially disposed in the space enclosed by the shell body and the shell bottom;

[0011] The shell body includes a first side wall and a second side wall arranged opposite to each other along the second direction, and a third side wall and a fourth side wall arranged opposite to each other along the third direction; the first side wall, the third side wall, the second side wall and the fourth side wall are bent and connected in sequence, and an end of the fourth side wall away from the second side wall is connected to the first side wall; the shell bottom is arranged at one end of the first side wall, the second side wall, the third side wall and the fourth side wall along the first direction; the first direction, the second direction and the third direction are arranged to intersect each other;

[0012] The first side wall includes a first partition wall and a second partition wall sequentially distributed along the third direction, and the first partition wall and the second partition wall are welded;

[0013] And / or, the second side wall includes a third partition wall and a fourth partition wall sequentially distributed along the third direction, and the third partition wall and the fourth partition wall are welded;

[0014] And / or, the third side wall includes a fifth partition wall and a sixth partition wall sequentially distributed along the second direction, and the fifth partition wall and the sixth partition wall are welded;

[0015] And / or, the fourth side wall includes a seventh partition wall and an eighth partition wall sequentially distributed along the second direction, and the seventh partition wall and the eighth partition wall are welded;

[0016] and / or, the first side wall and the third side wall are welded;

[0017] and / or, the first side wall and the fourth side wall are welded;

[0018] and / or, the second side wall is welded to the third side wall;

[0019] And / or, the second side wall is welded to the fourth side wall.

[0020] The battery cell provided in the embodiments of the present application has a shell that is at least partially steel-shelled, i.e., at least partially steel-shelled, which provides the shell with greater structural strength. Furthermore, the shell includes a body and a bottom, with at least a portion of the body welded together. Therefore, while ensuring greater structural strength for the battery cell as a whole, the shell wall thickness can be significantly reduced, thereby reducing the proportion of the shell within the battery cell, and thus enabling the battery cell to have a higher energy density.

[0021] In some embodiments, at least a portion of the housing has a wall thickness less than or equal to 0.2 mm.

[0022] Such an arrangement allows the shell to have a relatively large structural strength while at least part of the shell has a relatively small wall thickness, thereby reducing the proportion of the shell in the battery cell and thereby allowing the battery cell to have a higher energy density.

[0023] In some embodiments, at least a portion of the housing has a wall thickness less than or equal to 0.075 mm.

[0024] Such an arrangement allows the shell to have a relatively large structural strength while at least part of the shell has a very small wall thickness, which can greatly reduce the proportion of the shell in the battery cell, thereby allowing the battery cell to have a higher energy density.

[0025] In some embodiments, four edges of the shell body along the first direction toward the shell bottom are welded to the shell bottom.

[0026] The shell body is welded to the shell bottom along the first direction at one end thereof, so that the shell bottom and the shell body are integrally connected by welding.

[0027] In some embodiments, the first side wall and the third side wall are welded, and the third side wall, the second side wall, the fourth side wall and the first side wall are integrally connected in sequence;

[0028] Alternatively, the first side wall includes a first partition wall and a second partition wall that are sequentially distributed and welded along the third direction, and the first partition wall, the third side wall, the second side wall, the fourth side wall and the second partition wall are sequentially connected as one piece.

[0029] By adopting the above technical solution, the shell body can be obtained by setting multiple bends in one piece and then performing one welding. In this way, the shell body forming process is very simple and easy to implement.

[0030] In some embodiments, a wall area of ​​the first sidewall is smaller than a wall area of ​​the third sidewall.

[0031] By setting the wall area of ​​the first side wall to be smaller than the wall area of ​​the third side wall, the third side wall becomes a larger surface of the battery cell than the first side wall.

[0032] In some embodiments, the first side wall includes a first partition wall and a second partition wall sequentially distributed and welded along the third direction, the second side wall includes a third partition wall and a fourth partition wall sequentially distributed and welded along the third direction, the first partition wall, the third side wall, and the third partition wall are sequentially connected as one piece, and the fourth partition wall, the fourth side wall, and the second partition wall are sequentially connected;

[0033] Alternatively, the third side wall is welded to the first side wall and the second side wall respectively, and the first side wall, the fourth side wall and the second side wall are integrally connected in sequence;

[0034] Alternatively, the first side wall is welded to the third side wall, the second side wall is welded to the fourth side wall, the first side wall is integrally connected to the fourth side wall, and the second side wall is integrally connected to the third side wall.

[0035] The shell body can be obtained by arranging two integrally arranged parts and then welding the two parts in two passes. In this way, the forming process of the shell body is very simple and easy to implement.

[0036] In some embodiments, the first side wall, the third side wall, the second side wall, and the fourth side wall are welded in sequence, and an end of the fourth side wall away from the second side wall is welded to the first side wall.

[0037] By adopting the above technical solution, the first side wall, the second side wall, the third side wall and the fourth side wall can be formed into the shell body through four welding steps. In this way, the forming process of the shell body is very simple and easy to implement.

[0038] In some embodiments, the battery cell further includes an end cover disposed on the shell, and the electrode assembly is accommodated in a space enclosed by the shell and the end cover.

[0039] Such an arrangement enables the end cover and the shell to form the internal environment of the battery cell.

[0040] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0041] The battery provided in the embodiment of the present application, by adopting the battery cells involved above, can reduce the proportion of the shell in the battery cells, thereby making the battery cells have a higher energy density, thereby improving the energy density of the battery.

[0042] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0043] The electrical device provided in the embodiment of the present application can improve the energy density of the battery by adopting the battery cells or batteries involved above.

[0044] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0047] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0048] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0049] FIG4 is a first exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0050] FIG5 is a second exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0051] FIG6 is a third exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0052] FIG7 is a fourth exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0053] FIG8 is a fifth exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0054] FIG9 is a sixth exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0055] FIG10 is a seventh exploded schematic diagram of a battery cell housing provided by some embodiments of the present application;

[0056] FIG11 is an exploded schematic diagram eight of the shell of a battery cell provided in some embodiments of the present application.

[0057] Among them, the reference numerals in the figures are:

[0058] 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - housing; 201 - storage space; 21 - first portion; 22 - second portion; 11 - electrode assembly; 12 - housing; 121 - housing; 1211 - first sidewall; 12111 - first partition wall; 12112 - second partition wall; 1212 - second sidewall; 12121 - third partition wall; 12122 - fourth partition wall; 1213-third side wall; 12131-fifth partition wall; 12132-sixth partition wall; 1214-fourth side wall; 12141-seventh partition wall; 12142-eighth partition wall; 122-shell bottom; 13-end cover; a-first weld bead; b-second weld bead; c-third weld bead; d-fourth weld bead; e-fifth weld bead; f-sixth weld bead; g-seventh weld bead; h-eighth weld bead; Z-first direction; Y-second direction; X-third direction. DETAILED DESCRIPTION

[0059] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0060] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0062] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0063] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0065] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0066] In the related art, a battery cell may generally include a shell, an electrode assembly, and an end cover, wherein the electrode assembly is disposed in an internal environment defined by the shell and the end cover.

[0067] In some cases, to ensure greater structural strength of the battery cell as a whole, the shell is usually provided with a thicker wall. As a result, the shell occupies a larger proportion of the battery cell, which limits the energy density of the battery cell to a certain extent.

[0068] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, and an electrical device. By configuring at least a portion of the housing as a steel shell, i.e., at least a portion of the housing is made of steel, the housing has greater structural strength. Furthermore, the housing includes a body and a bottom, and at least a portion of the body is welded. Therefore, while ensuring greater structural strength for the battery cell as a whole, the wall thickness of the housing can be significantly reduced, thereby reducing the proportion of the housing in the battery cell, and thereby enabling the battery cell to have a higher energy density.

[0069] In some embodiments, the battery cells and batteries involved in the embodiments of the present application can be used in electrical devices that use the battery cells or batteries as a power source.

[0070] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like. According to the drive mode, vehicles may be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0071] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, such as energy storage containers, energy storage cabinets, and the like.

[0072] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0073] In some embodiments, the battery may be a battery module. When multiple battery cells are present, the multiple battery cells are arranged and secured to form a battery module. For example, the multiple battery cells may be secured to form a battery module using cable ties or other similar means. For example, the multiple battery cells may also be secured to form a battery module using end plates, side plates, or other similar means.

[0074] In other embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, the battery cells may be first formed into a battery module and then housed in the housing.

[0075] The battery cells referred to in the embodiments of this application are the smallest units that store and output electrical energy. These cells can be secondary batteries or primary batteries. They can be, but are not limited to, metal batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries. They can be cylindrical, flat, rectangular, or other shapes.

[0076] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0077] In some embodiments, please refer to FIG1 , which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The interior of the vehicle 1000 is provided with the above-mentioned battery 100, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0078] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0079] In some embodiments, please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 has a structure with a storage space 201 therein and can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 21 and a second portion 22, which overlap each other and together define the storage space 201.

[0080] 2 , the first portion 21 may be a hollow structure with an opening at one end, and the second portion 22 may be a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201. Alternatively, the first portion 21 and the second portion 22 may both be hollow structures with an opening at one end, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201.

[0081] The box body 20 composed of the first part 21 and the second part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0082] In some embodiments, referring to FIG. 2 , multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 10 may be directly accommodated in the aforementioned accommodation space 201 of the housing 20. In other embodiments, multiple battery cells 10 may also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form a battery module, and the battery module may be accommodated in the aforementioned accommodation space 201 of the housing 20. In still other embodiments, multiple battery modules may also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form multiple battery modules, and then the multiple battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the aforementioned accommodation space 201 of the housing 20.

[0083] In some embodiments, the housing 20 of the battery 100 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may form at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 may form at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0084] In some embodiments, please refer to Figure 3, which is an exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 may include an electrode assembly 11 and a housing.

[0085] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet containing active materials constitute the main body of the electrode assembly 11, while the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The tab of the positive electrode sheet is the positive tab, and the tab of the negative electrode sheet is the negative tab. The positive tab and the negative tab can be located together at one end of the main body or at opposite ends of the main body.

[0086] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0087] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0088] In some embodiments, the battery cell 10 may further include an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The electrolyte in the embodiments of the present application may be in liquid, gel, or solid form.

[0089] In some embodiments, please continue to refer to Figure 3. The outer shell may include a shell 12 and an end cap 13. The shell 12 and the end cap 13 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 12 and the end cap 13 is used to accommodate the electrode assembly 11 and the electrolyte. Among them, the shell 12 and the end cap 13 may be independent components. Specifically, the shell 12 has an opening, and the end cap 13 is covered at the opening of the shell 12 to jointly define the internal environment of the battery cell 10 with the shell 12, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell 12 and the end cap 13 may also be an integrated structure. Specifically, a common connection surface can be formed between the end cap 13 and the shell 12 before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 is placed in the shell and the electrode assembly 11 needs to be encapsulated, the end cap 13 is then covered with the shell 12.

[0090] As shown in FIG3 , the number of the end cap 13 may be one. Alternatively, the number of the end cap 13 may be two, and the two end caps 13 are respectively disposed at opposite ends of the housing 12 .

[0091] The shell 12 may be cylindrical, square, or other shapes, and may be determined according to the specific shape and size of the electrode assembly 11 .

[0092] Please continue to refer to Figure 3 in conjunction with the other figures. The battery 100 provided in this embodiment includes a housing 12 and an electrode assembly 11. At least a portion of the housing 12 is a steel shell. At least a portion of the electrode assembly 11 is disposed within the housing 12.

[0093] At least a portion of the housing 12 is a steel shell, meaning that the housing 12 is a steel shell, i.e., the material of the housing 12 is steel. Alternatively, one portion of the housing 12 is a steel shell, while another portion is a shell made of another material; that is, one portion of the housing 12 is made of steel, while the other portion can be made of at least one of copper, iron, aluminum, and an aluminum alloy.

[0094] As an example, the housing 12 is a steel shell made of at least one of 304 stainless steel (SUS304), 316 stainless steel (SUS316), SPCC and the like.

[0095] At least part of the electrode assembly 11 is disposed in the shell 12 . Part of the electrode assembly 11 may be contained in the shell 12 , and the other part may be located outside the shell 12 . Alternatively, the electrode assembly 11 may be completely contained in the shell 12 .

[0096] The battery cell 100 provided in the embodiment of the present application has a housing 12 that is at least partially steel. This provides the housing 12 with significant structural strength. Therefore, while ensuring the overall structural strength of the battery cell 100, the thickness of the housing 12 can be significantly reduced, thereby reducing the proportion of the housing 12 within the battery cell 100 and, in turn, enabling the battery cell 100 to have a higher energy density.

[0097] Furthermore, steel has a relatively high melting point, which in turn results in a relatively high melting point for the housing 12. Thus, in the battery 100, when a cell in a battery 100 experiences thermal runaway, the higher melting point of the housing 12 can slow the spread of thermal runaway from the cell to adjacent cells. This can mitigate the problem of thermal runaway in adjacent cells due to melting of the housing 12, effectively reducing the risk of a chain reaction of thermal runaway within the battery 100 and ensuring higher reliability.

[0098] In some embodiments, the melting point of the shell 12 is greater than 1000° C. and less than 2500° C. at standard atmospheric pressure. For example, the melting point of the shell 12 may be 1100° C., 1200° C., 1300° C., 1400° C., 1500° C., 1600° C., 1700° C., 1800° C., 1900° C., etc.

[0099] In this way, the shell 12 has a higher melting point.

[0100] In some embodiments, at least a portion of the housing 12 has a wall thickness less than or equal to 0.2 mm.

[0101] It is understandable that the overall wall thickness of the housing 12 is less than or equal to 0.2 mm. Alternatively, the wall thickness of a portion of the housing 12 is less than or equal to 0.2 mm.

[0102] For example, the wall thickness of at least part of the housing 12 may be 0.19 mm, 0.18 mm, 0.17 mm, 0.16 mm, 0.15 mm, 0.14 mm, 0.13 mm, 0.12 mm, 0.11 mm, 0.1 mm, 0.095 mm, 0.09 mm, 0.085 mm, 0.08 mm, 0.075 mm, 0.07 mm, 0.065 mm, 0.06 mm, 0.05 mm, etc.

[0103] Such a configuration allows the shell 12 to have a relatively large structural strength while at least part of the shell 12 has a relatively small wall thickness, thereby reducing the proportion of the shell 12 in the battery 100, thereby allowing the battery 100 to have a relatively high energy density.

[0104] In some embodiments, at least a portion of the housing 12 has a wall thickness less than or equal to 0.075 mm.

[0105] It is understandable that the overall wall thickness of the housing 12 is less than or equal to 0.075 mm. Alternatively, the wall thickness of a portion of the housing 12 is less than or equal to 0.075 mm.

[0106] For example, the wall thickness of at least a portion of the housing 12 may be 0.075 mm, 0.072 mm, 0.07 mm, 0.068 mm, 0.065 mm, 0.062 mm, 0.06 mm, 0.058 mm, 0.055 mm, 0.05 mm, etc.

[0107] Such a configuration allows the shell 12 to have a relatively large structural strength while at least part of the shell 12 has a very small wall thickness, which can greatly reduce the proportion of the shell 12 in the battery 100 cell, thereby allowing the battery 100 cell to have a higher energy density.

[0108] It should be noted that at least a portion of the housing 12 may be at least one of the housing bottom 122, the first sidewall 1211, the second sidewall 1212, the third sidewall 1213, and the fourth sidewall 1214 described below. The wall thickness of the housing bottom 122 is the dimension of the housing bottom 122 along the first direction Z, the wall thickness of the first sidewall 1211 is the dimension of the first sidewall 1211 along the second direction Y, the wall thickness of the second sidewall 1212 is the dimension of the second sidewall 1212 along the second direction Y, the wall thickness of the third sidewall 1213 is the dimension of the third sidewall 1213 along the third direction X, and the wall thickness of the fourth sidewall 1214 is the dimension of the fourth sidewall 1214 along the third direction X.

[0109] In some embodiments, please refer to Figures 4 to 10 in conjunction with other drawings. Among them, Figures 4 to 10 are respectively exploded views of the shell 12 of the battery 100 monomer provided in eight embodiments of the present application. The shell 12 includes a shell body 121 and a shell bottom 122. The shell bottom 122 is arranged at one end of the shell body 121 along the first direction Z. As shown in Figures 4 to 10, the shell bottom 122 is separately connected to the shell body 121; or, the shell bottom 122 is integrally connected to the shell body 121. At least a portion of the electrode assembly 11 is arranged in the space enclosed by the shell body 121 and the shell bottom 122.

[0110] At least a portion of the housing 12 is made of steel. This may be at least a portion of the body 121, at least a portion of the bottom 122, or both. For example, if both the body 121 and the bottom 122 are made of steel, the entire housing 12 is made of steel.

[0111] The shell body 121 and the housing 12 are two parts of the housing 12. As shown in Figures 4 to 10, the shell body 121 is arranged to pass through along the first direction Z, and the shell bottom 122 is arranged at one end of the shell body 121 along the first direction Z to close the opening at one end of the shell body 121 along the first direction Z.

[0112] The first direction Z is parallel to the Z axis shown in Figures 4 to 10. The first direction Z may be a height direction or a length direction of the battery 100.

[0113] The shell bottom 122 and the shell body 121 can be separately connected by welding, bonding, etc.

[0114] The shell bottom 122 and the shell body 121 can be integrally connected by integral die-casting, stamping, etc.

[0115] The shell bodies 121 are connected separately or integrally to each other, so that the shell 12 can be a separate connection structure or an integral connection structure. The molding process of the shell 12 is very flexible, has strong selectivity, and is easy to mold.

[0116] In some embodiments, please refer to FIG. 4 to FIG. 10 in conjunction with other drawings. The four edges of the shell body 121 along the first direction Z at one end facing the shell bottom 122 are welded to the shell bottom 122 .

[0117] Specifically, the four edges of the shell body 121 along the first direction Z, at one end facing the shell bottom 122, are correspondingly welded to the four edges of the housing 12. The four edges of the shell body 121 along the first direction Z, at one end facing the shell bottom 122, refer to the four edges of the shell body 121 along the first direction Z, at one end facing the shell bottom 122, along the first direction Z. Correspondingly, the four edges of the shell bottom 122 refer to the four edges of the shell bottom 122 along the first direction Z.

[0118] The shell body 121 is welded to the shell bottom 122 along the first direction Z at one end thereof, so that the shell bottom 122 and the shell body 121 are integrally connected by welding.

[0119] It should be noted that when the dimension of the housing 12 along the first direction Z is large, forming the housing 12 by integral die-casting, stamping, or other methods to integrally connect the shell body 121 and the shell bottom 122 may cause the housing 12 to break during the molding process, making it difficult to mold the housing 12. In the battery cell 100 provided in the embodiment of the present application, the shell bottom 122 and the shell body 121 are separately connected by a method that may be, but is not limited to, welding, to facilitate the molding of the housing 12.

[0120] In some embodiments, please refer to Figures 4 to 10 in conjunction with other figures. The housing 121 includes a first sidewall 1211, a second sidewall 1212, a third sidewall 1213, and a fourth sidewall 1214. The first sidewall 1211 and the second sidewall 1212 are arranged opposite each other along the second direction Y, and the third sidewall 1213 and the fourth sidewall 1214 are arranged opposite each other along the third direction X. The first sidewall 1211, the third sidewall 1213, the second sidewall 1212, and the fourth sidewall 1214 are bent and connected in sequence, and the end of the fourth sidewall 1214 away from the second sidewall 1212 is connected to the first sidewall 1211. The housing bottom 122 is disposed at the same end of the first sidewall 1211, the second sidewall 1212, the third sidewall 1213, and the fourth sidewall 1214 along the first direction Z. The first direction Z, the second direction Y, and the third direction X are arranged to intersect each other.

[0121] It should be noted here that the first direction Z, the second direction Y and the third direction X are set to intersect in pairs, which means that the first direction Z and the second direction Y intersect, the second direction Y intersects the third direction X, and the first direction Z intersects the third direction X. The intersection of the first direction Z and the second direction Y means that the first direction Z and the second direction Y can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction Y are not parallel. Among them, the first direction Z and the second direction Y can be perpendicular to each other or not. The first direction Z and the second direction Y can be directions that intersect on the same plane, or directions on planes that are not parallel to each other, and the projection of the second direction Y on the plane where the first direction Z is located can intersect with the first direction Z. As an example, the first direction Z is parallel to the Z axis, the second direction Y is parallel to the Y axis, and the third direction X is parallel to the X axis, that is, the first direction Z and the second direction Y are perpendicular, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X. The X-axis, Y-axis, and Z-axis are three coordinate axes of the spatial coordinate system. The X-axis is perpendicular to the Y-axis, the X-axis is perpendicular to the Z-axis, and the Y-axis is perpendicular to the Z-axis.

[0122] The first sidewall 1211, the second sidewall 1212, the third sidewall 1213, and the fourth sidewall 1214 are four solid walls of the housing 121. At least a portion of the electrode assembly 11 is disposed within a space enclosed by the first sidewall 1211, the second sidewall 1212, the third sidewall 1213, the fourth sidewall 1214, and the housing bottom 122.

[0123] As shown in Figures 4 to 10, one end of the first side wall 1211 along the third direction X is integrally connected or separately connected to one end of the third side wall 1213 along the second direction Y, one end of the first side wall 1211 along the third direction X away from the third side wall 1213 is integrally connected or separately connected to one end of the fourth side wall 1214 along the second direction Y, one end of the second side wall 1212 along the third direction X is integrally connected or separately connected to one end of the third side wall 1213 along the second direction Y away from the first side wall 1211, and one end of the second side wall 1212 along the third direction X away from the third side wall 1213 is integrally connected or separately connected to one end of the fourth side wall 1214 along the second direction Y away from the first side wall 1211. In this way, the first side wall 1211, the third side wall 1213, the second side wall 1212 and the fourth side wall 1214 are connected integrally or separately in sequence, the end of the fourth side wall 1214 away from the second side wall 1212 is connected integrally or separately to the first side wall 1211, and the first side wall 1211 and the third side wall 1213 are bent relative to each other, the third side wall 1213 and the second side wall 1212 are bent relative to each other, the second side wall 1212 and the fourth side wall 1214 are bent relative to each other, and the fourth side wall 1214 and the first side wall 1211 are bent relative to each other.

[0124] With such configuration, the shell body 121 is substantially in a cubic shape, that is, the battery 100 is a square battery 100 .

[0125] Based on this, the shell bottom 122 is also roughly square. The four edges of the shell body 121 along the first direction Z at one end of the shell bottom 122 are welded to the shell bottom 122, which means that the four edges of the shell bottom 122 are respectively welded to the first side wall 1211, the third side wall 1213, the second side wall 1212 and the fourth side wall 1214.

[0126] It should be noted that the integral connection involved in each embodiment of the present application can be achieved by integral die-casting, stamping, etc., and the split connection involved in each embodiment of the present application can be achieved by welding, bonding, etc.

[0127] In some embodiments, please refer to FIG. 4 to FIG. 10 , at least a portion of the shell 121 is welded.

[0128] The at least partially welded arrangement of the shell body 121 means that welding is included in the forming process of the shell body 121. For example, the shell body 121 is composed of multiple parts, and at least two parts are welded and fixed.

[0129] Such a configuration makes the molding process of the shell body 121 very flexible, with strong selectivity and convenient molding.

[0130] Regarding at least a portion of the welding arrangement of the shell 121:

[0131] In some embodiments, referring to FIG. 4 and FIG. 5 , the first side wall 1211 includes a first partition wall 12111 and a second partition wall 12112 . The first partition wall 12111 and the second partition wall 12112 are sequentially distributed along the third direction X and welded.

[0132] As shown in FIG. 4 and FIG. 5 , the first partition wall 12111 and the second partition wall 12112 are welded to form a first weld bead a.

[0133] Furthermore, one end of the first partition wall 12111 away from the second partition wall 12112 along the third direction X is integrally or separately connected to the third side wall 1213, and the first partition wall 12111 and the third side wall 1213 are bent relative to each other. One end of the second partition wall 12112 away from the first partition wall 12111 along the third direction X is integrally or separately connected to the fourth side wall 1214, and the second partition wall 12112 and the fourth side wall 1214 are bent relative to each other.

[0134] In some embodiments, referring to FIG. 5 , the second side wall 1212 includes a third partition wall 12121 and a fourth partition wall 12122 . The third partition wall 12121 and the fourth partition wall 12122 are sequentially distributed along the third direction X and welded.

[0135] As shown in FIG5 , the third partition wall 12121 and the fourth partition wall 12122 are welded to form a second weld bead b.

[0136] Furthermore, one end of the third partition wall 12121 away from the fourth partition wall 12122 along the third direction X is integrally or separately connected to the third side wall 1213, and the third partition wall 12121 and the third side wall 1213 are bent relative to each other. One end of the fourth partition wall 12122 away from the third partition wall 12121 along the third direction X is integrally or separately connected to the fourth side wall 1214, and the fourth partition wall 12122 and the fourth side wall 1214 are bent relative to each other.

[0137] In some embodiments, referring to FIG. 6 and FIG. 7 , the third sidewall 1213 includes a fifth partition wall 12131 and a sixth partition wall 12132 . The fifth partition wall 12131 and the sixth partition wall 12132 are sequentially distributed along the second direction Y and welded.

[0138] As shown in FIG6 and FIG7 , the fifth partition wall 12131 and the sixth partition wall 12132 are welded to form a third weld bead c.

[0139] Furthermore, one end of the fifth partition wall 12131 away from the sixth partition wall 12132 along the second direction Y is integrally or separately connected to the first side wall 1211, and the fifth partition wall 12131 and the first side wall 1211 are bent relative to each other. One end of the sixth partition wall 12132 away from the fifth partition wall 12131 along the second direction Y is integrally or separately connected to the second side wall 1212, and the sixth partition wall 12132 and the second side wall 1212 are bent relative to each other.

[0140] In some embodiments, referring to FIG. 7 , the fourth sidewall 1214 includes a seventh partition wall 12141 and an eighth partition wall 12142 . The seventh partition wall 12141 and the eighth partition wall 12142 are sequentially distributed along the second direction Y and welded.

[0141] As shown in FIG. 7 , the seventh partition wall 12141 and the eighth partition wall 12142 are welded to form a fourth weld bead d.

[0142] Furthermore, one end of the seventh partition wall 12141 away from the eighth partition wall 12142 along the second direction Y is integrally or separately connected to the first side wall 1211, and the seventh partition wall 12141 and the first side wall 1211 are bent relative to each other. One end of the eighth partition wall 12142 away from the seventh partition wall 12141 along the second direction Y is integrally or separately connected to the second side wall 1212, and the eighth partition wall 12142 and the second side wall 1212 are bent relative to each other.

[0143] In some embodiments, referring to FIG. 8 to FIG. 11 , the first side wall 1211 and the third side wall 1213 are welded.

[0144] As shown in FIG. 8 to FIG. 11 , the first side wall 1211 and the third side wall 1213 are bent relative to each other and welded to form a fifth weld bead e.

[0145] In some embodiments, referring to both FIG. 9 and FIG. 11 , the second side wall 1212 and the third side wall 1213 are welded.

[0146] As shown in FIG. 9 and FIG. 11 , the second side wall 1212 and the third side wall 1213 are bent relative to each other and welded to form a sixth weld bead f.

[0147] In some embodiments, referring to both FIG. 10 and FIG. 11 , the second side wall 1212 and the fourth side wall 1214 are welded.

[0148] As shown in FIG. 10 and FIG. 11 , the second side wall 1212 and the fourth side wall 1214 are bent relative to each other and welded to form a seventh weld bead g.

[0149] In some embodiments, referring to FIG. 11 , the first sidewall 1211 and the fourth sidewall 1214 are welded.

[0150] As shown in FIG. 11 , the first side wall 1211 and the fourth side wall 1214 are bent relative to each other and welded to form an eighth weld bead h.

[0151] Based on the above structure, at least one of the first weld bead a, the second weld bead b, the third weld bead c, the fourth weld bead d, the fifth weld bead e, the sixth weld bead f, the seventh weld bead g and the eighth weld bead h is provided on the shell body 121 .

[0152] Such an arrangement makes the welding process of the shell body 121 very flexible, has strong selectivity, and is convenient for forming.

[0153] In some embodiments, referring to FIG. 4 and in conjunction with other figures, the first sidewall 1211 includes the aforementioned first partition wall 12111 and the aforementioned second partition wall 12112. The first partition wall 12111 and the second partition wall 12112 are sequentially arranged along the third direction X and welded together. The first partition wall 12111, the third sidewall 1213, the second sidewall 1212, the fourth sidewall 1214, and the second partition wall 12112 are sequentially connected as one piece.

[0154] The first partition wall 12111 and the second partition wall 12112 are welded to form a first weld bead a.

[0155] Specifically, the first partition wall 12111 is integrally connected to the third side wall 1213 and is bent relative to each other. The third side wall 1213 is integrally connected to the fourth side wall 1214 and is bent relative to each other. The third side wall 1213 is integrally connected to the fourth side wall 1214 and is bent relative to each other. The fourth side wall 1214 is integrally connected to the second partition wall 12112 and is bent relative to each other.

[0156] The shell body 121 can be obtained by integrally setting four bends and then performing one welding.

[0157] Alternatively, in other embodiments, referring to FIG8 and in combination with other drawings, the first side wall 1211 and the third side wall 1213 are welded, and the third side wall 1213 , the second side wall 1212 , the fourth side wall 1214 and the first side wall 1211 are integrally connected in sequence.

[0158] Specifically, as shown in FIG8 , first side wall 1211 and third side wall 1213 are bent relative to each other and welded to form a fifth weld bead e. Third side wall 1213 and fourth side wall 1214 are integrally connected and bent relative to each other. Third side wall 1213 and fourth side wall 1214 are integrally connected and bent relative to each other. Fourth side wall 1214 is integrally connected to first side wall 1211 and bent relative to each other.

[0159] The shell body 121 can be obtained by integrally setting three bends and performing one welding.

[0160] By adopting the above technical solution, multiple bends are provided in one piece, and then welding is performed to obtain the shell body 121. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0161] In some embodiments, please refer to FIG. 4 to FIG. 11 together with other drawings. The wall area of ​​the first sidewall 1211 is smaller than the wall area of ​​the third sidewall 1213 .

[0162] The wall area of ​​the first sidewall 1211 is the area of ​​any surface of the first sidewall 1211 along the second direction Y. The wall area of ​​the third sidewall 1213 is the area of ​​any surface of the third sidewall 1213 along the third direction X.

[0163] By setting the wall area of ​​the first side wall 1211 to be smaller than the wall area of ​​the third side wall 1213 , the third side wall 1213 becomes a larger surface of the battery 100 relative to the first side wall 1211 .

[0164] By setting a first weld bead a between the first partition wall 12111 and the second partition wall 12112 of the first side wall 1211, compared with setting a third weld bead c between the fifth partition wall 12131 and the sixth partition wall 12132 of the third side wall 1213, the third side wall 1213 can better resist the expansion of the large surface of the electrode assembly 11, thereby making the battery 100 single body have higher reliability.

[0165] In some embodiments, the wall area of ​​the first sidewall 1211 is substantially the same as the wall area of ​​the second sidewall 1212, and the wall area of ​​the third sidewall 1213 is substantially the same as the wall area of ​​the fourth sidewall 1214. Thus, the large surface of the battery 100 is located on the third sidewall 1213 and the fourth sidewall 1214.

[0166] It can be understood that in other embodiments, the wall area of ​​the first sidewall 1211 may be the same as the wall area of ​​the third sidewall 1213 , or the wall area of ​​the first sidewall 1211 may be greater than the wall area of ​​the third sidewall 1213 .

[0167] In some embodiments, please refer to Figure 5 and combine with other figures. The first side wall 1211 includes the first partition wall 12111 and the second partition wall 12112. The first partition wall 12111 and the second partition wall 12112 are sequentially distributed along the third direction X and welded. The second side wall 1212 includes the third partition wall 12121 and the fourth partition wall 12122. The third partition wall 12121 and the fourth partition wall 12122 are sequentially distributed along the third direction X and welded. The first partition wall 12111, the third side wall 1213, and the third partition wall 12121 are sequentially connected as a whole. The fourth partition wall 12122, the fourth side wall 1214, and the second partition wall 12112 are sequentially connected.

[0168] Specifically, as shown in FIG5 , the first partition wall 12111 and the second partition wall 12112 are welded to form a first weld bead a, and the third partition wall 12121 and the fourth partition wall 12122 are welded to form a second weld bead b.

[0169] The first partition wall 12111 is bent relative to and integrally connected to the third side wall 1213. The third side wall 1213 is bent relative to and integrally connected to the third partition wall 12121. The fourth partition wall 12122 is bent relative to and integrally connected to the fourth side wall 1214. The fourth side wall 1214 is bent relative to and integrally connected to the second partition wall 12112.

[0170] By providing two components, each of which is integrally provided with two bends, and then welding the two components in two steps, the shell body 121 can be obtained. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0171] Alternatively, in other embodiments, referring to FIG9 and other drawings, the third side wall 1213 is welded to the first side wall 1211 and the second side wall 1212 respectively, and the first side wall 1211, the fourth partition wall 12122 and the second side wall 1212 are integrally connected in sequence.

[0172] 9 , the third side wall 1213 and the first side wall 1211 are bent relative to each other and welded to form a fifth weld bead e. The third side wall 1213 and the second side wall 1212 are bent relative to each other and welded to form a sixth weld bead f.

[0173] The first side wall 1211 and the fourth side wall 1214 are bent relative to each other and are integrally connected. The fourth side wall 1214 and the second side wall 1212 are bent relative to each other and are integrally connected.

[0174] By providing two parts, one of which is integrally provided with two bends, and then welding the two parts in two steps, the shell body 121 can be obtained. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0175] Alternatively, in some other embodiments, referring to FIG. 10 and in combination with other drawings, the first side wall 1211 is welded to the third side wall 1213 , the second side wall 1212 is welded to the fourth side wall 1214 , the first side wall 1211 is integrally connected to the fourth side wall 1214 , and the second side wall 1212 is integrally connected to the third side wall 1213 .

[0176] 10 , the first side wall 1211 and the third side wall 1213 are bent relative to each other and welded to form a fifth weld bead e. The second side wall 1212 and the fourth side wall 1214 are bent relative to each other and welded to form a seventh weld bead g.

[0177] The first side wall 1211 and the fourth side wall 1214 are bent relative to each other and are integrally connected. The second side wall 1212 and the third side wall 1213 are bent relative to each other and are integrally connected.

[0178] By providing two components, each of which is integrally provided with a bend, and then welding the two components in two passes, the shell body 121 can be obtained. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0179] By arranging two integrally arranged components and then welding the two components in two passes, the shell body 121 can be obtained. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0180] In some embodiments, referring to FIG. 11 and other figures, the first side wall 1211 , the third side wall 1213 , the second side wall 1212 , and the fourth side wall 1214 are welded in sequence, and the end of the fourth side wall 1214 away from the second side wall 1212 is welded to the first side wall 1211 .

[0181] The first side wall 1211 and the third side wall 1213 are bent relative to each other and welded together to form a fifth weld bead e. The third side wall 1213 and the second side wall 1212 are bent relative to each other and welded together to form a sixth weld bead f. The second side wall 1212 and the fourth side wall 1214 are bent relative to each other and welded together to form a seventh weld bead g. The fourth side wall 1214 and the first side wall 1211 are bent relative to each other and welded together to form an eighth weld bead h.

[0182] By adopting the above technical solution, the first side wall 1211, the second side wall 1212, the third side wall 1213 and the fourth side wall 1214 can be welded in four steps to form the shell body 121. In this way, the forming process of the shell body 121 is very simple and easy to implement.

[0183] In some embodiments, referring to FIG3 and other figures, the battery 100 further includes an end cap 13 disposed on the housing 12 . The electrode assembly 11 is accommodated in a space enclosed by the housing 12 and the end cap 13 .

[0184] Specifically, the end cap 13 is disposed at one end of the shell body 121 away from the shell bottom 122 along the first direction Z, so that the end cap 13 , the shell body 121 and the shell bottom 122 can enclose a space for accommodating the electrode assembly 11 .

[0185] Such an arrangement enables the end cover 13 and the shell 12 to form the internal environment of the battery 100 unit.

[0186] Referring to FIG. 2 and the other accompanying drawings, the battery 100 provided in the embodiment of the present application includes a battery cell 100. The battery cell 100 in this embodiment is identical to the battery cell 100 in the previous embodiment. For details, please refer to the description of the battery cell 100 in the previous embodiment, which will not be repeated here.

[0187] The battery 100 provided in the embodiment of the present application can reduce the proportion of the shell 12 in the battery 100 cell by adopting the battery 100 cell involved above, thereby making the battery 100 cell have a higher energy density, thereby improving the energy density of the battery 100.

[0188] Referring to FIG1 , the electrical device provided in the embodiment of the present application includes a battery 100 or a battery 100. The battery 100 and the battery 100 in this embodiment are the same as those in the previous embodiment. For details, please refer to the description of the battery 100 and the battery 100 in the previous embodiment, which will not be repeated here.

[0189] The electrical device provided in the embodiment of the present application can improve the energy density of the battery 100 by adopting the battery 100 monomer or the battery 100 involved above.

[0190] As one of the embodiments of the present application, as shown in Figures 3 and 4, a battery cell 100 includes an electrode assembly 11, a shell 12, and an end cap 13. The electrode assembly 11 is disposed in an internal environment defined by the end cap 13 and the shell 12. The shell 12 is a steel shell. The shell 12 includes a shell body 121 and a shell bottom 122. The shell body 121 is arranged to pass through along the first direction Z. The end cap 13 and the shell bottom 122 are respectively arranged at opposite ends of the shell body 121 along the first direction Z. The shell body 121 includes a first side wall 1211, a second side wall 1212, a third side wall 1213, and a fourth side wall 1214. The first side wall 1211 and the second side wall 1212 are arranged opposite to each other along the second direction Y, and the third side wall 1213 and the fourth side wall 1214 are arranged opposite to each other along the third direction X. The first sidewall 1211 includes a first partition wall 12111 and a second partition wall 12112, which are sequentially arranged along the third direction X and welded to form a first weld bead a. The first partition wall 12111, the third sidewall 1213, the second sidewall 1212, the fourth sidewall 1214, and the second partition wall 12112 are sequentially connected as a whole. The first partition wall 12111 and the third sidewall 1213 are bent relative to each other, the third sidewall 1213 and the second sidewall 1212 are bent relative to each other, the second sidewall 1212 and the fourth sidewall 1214 are bent relative to each other, and the fourth sidewall 1214 and the second partition wall 12112 are bent relative to each other. The first partition wall 12111, the second partition wall 12112, the second sidewall 1212, the third sidewall 1213, and the fourth sidewall 1214 are welded to the shell bottom 122 at one end away from the end cover 13 along the first direction Z.

[0191] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: include: A shell (12), at least part of which is a steel shell; the shell (12) comprises a shell body (121) and a shell bottom (122); the shell bottom (122) is arranged at one end of the shell body (121) along a first direction (Z), and is separately connected to or integrally connected to the shell body (121); The electrode assembly (11) is at least partially disposed in a space enclosed by the shell body (121) and the shell bottom (122); The shell body (121) comprises a first side wall (1211) and a second side wall (1212) which are arranged opposite to each other along a second direction (Y), and a third side wall (1213) and a fourth side wall (1214) which are arranged opposite to each other along a third direction (X); the first side wall (1211), the third side wall (1213), the second side wall (1212) and the fourth side wall (1214) are bent and connected in sequence, and an end of the fourth side wall (1214) away from the second side wall (1212) is connected to the first side wall (1211); the shell bottom (122) is arranged at one end of the first side wall (1211), the second side wall (1212), the third side wall (1213) and the fourth side wall (1214) along the first direction (Z); the first direction (Z), the second direction (Y) and the third direction (X) are arranged to cross each other in pairs; Wherein, the first side wall (1211) comprises a first partition wall (12111) and a second partition wall (12112) sequentially distributed along the third direction (X), and the first partition wall (12111) and the second partition wall (12112) are welded; And / or, the second side wall (1212) comprises a third partition wall (12121) and a fourth partition wall (12122) sequentially distributed along the third direction (X), and the third partition wall (12121) and the fourth partition wall (12122) are welded; And / or, the third side wall (1213) comprises a fifth partition wall (12131) and a sixth partition wall (12132) sequentially distributed along the second direction (Y), and the fifth partition wall (12131) and the sixth partition wall (12132) are welded; And / or, the fourth side wall (1214) includes a seventh partition wall (12141) and an eighth partition wall (12142) sequentially distributed along the second direction (Y), and the seventh partition wall (12141) and the eighth partition wall (12142) are welded; and / or, the first side wall (1211) and the third side wall (1213) are welded; and / or, the first side wall (1211) and the fourth side wall (1214) are welded; and / or, the second side wall (1212) and the third side wall (1213) are welded; And / or, the second side wall (1212) is welded to the fourth side wall (1214).

2. The battery cell (10) according to claim 1, wherein: The wall thickness of at least part of the shell (12) is less than or equal to 0.2 mm.

3. The battery cell (10) according to claim 1 or 2, wherein: The wall thickness of at least part of the shell (12) is less than or equal to 0.075 mm.

4. The battery cell (10) according to any one of claims 1 to 3, wherein: The peripheral edges of the shell body (121) at one end along the first direction (Z) facing the shell bottom (122) are welded to the shell bottom (122).

5. The battery cell (10) according to any one of claims 1 to 4, wherein: The first side wall (1211) and the third side wall (1213) are welded, and the third side wall (1213), the second side wall (1212), the fourth side wall (1214) and the first side wall (1211) are integrally connected in sequence; Alternatively, the first side wall (1211) includes a first partition wall (12111) and a second partition wall (12112) which are distributed in sequence along the third direction (X) and welded, and the first partition wall (12111), the third side wall (1213), the second side wall (1212), the fourth side wall (1214) and the second partition wall (12112) are sequentially connected as a whole.

6. The battery cell (10) according to any one of claims 1 to 5, wherein: The wall area of ​​the first side wall (1211) is smaller than the wall area of ​​the third side wall (1213).

7. The battery cell (10) according to any one of claims 1 to 6, wherein: The first side wall (1211) comprises a first partition wall (12111) and a second partition wall (12112) which are sequentially distributed and welded along the third direction (X); the second side wall (1212) comprises a third partition wall (12121) and a fourth partition wall (12122) which are sequentially distributed and welded along the third direction (X); the first partition wall (12111), the third side wall (1213), and the third partition wall (12121) are sequentially connected as a whole; and the fourth partition wall (12122), the fourth side wall (1214), and the second partition wall (12112) are sequentially connected; Alternatively, the third side wall (1213) is welded to the first side wall (1211) and the second side wall (1212) respectively, and the first side wall (1211), the fourth side wall (1214) and the second side wall (1212) are integrally connected in sequence; Alternatively, the first side wall (1211) is welded to the third side wall (1213), the second side wall (1212) is welded to the fourth side wall (1214), the first side wall (1211) is integrally connected to the fourth side wall (1214), and the second side wall (1212) is integrally connected to the third side wall (1213).

8. The battery cell (10) according to any one of claims 1 to 7, wherein: The first side wall (1211), the third side wall (1213), the second side wall (1212) and the fourth side wall (1214) are welded in sequence, and an end of the fourth side wall (1214) away from the second side wall (1212) is welded to the first side wall (1211).

9. The battery cell (10) according to any one of claims 1 to 8, wherein: The battery cell (10) further comprises an end cover (13) arranged on the shell (12), and the electrode assembly (11) is accommodated in a space enclosed by the shell (12) and the end cover (13).

10. A battery (100), wherein: The invention comprises a plurality of battery cells (10) according to any one of claims 1 to 9.

11. An electrical device, wherein: It comprises a battery cell (10) according to any one of claims 1 to 9; or it comprises a battery (100) according to claim 10.

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