Battery cell, battery, and electrical apparatus

Abstract

Embodiments of the present application provide a battery cell, a battery, and an electrical apparatus. The battery cell comprises a housing, an end cover, and an electrode terminal. The housing is provided with an opening, the end cover is used for covering the opening, the electrode terminal is provided on the housing, and the end cover is a wall, having the largest area, of the battery cell. By arranging the end cover as the wall having the largest area on the battery cell, the area of the opening can be increased to facilitate a structure in the battery cell to enter the housing, the assembly speed during assembly is increased, and then the production efficiency of the battery cell is improved.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202221856857.X, filed on July 19, 2022, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] As the depletion of natural resources and environmental damage worsen, interest in devices that can store and effectively utilize energy is growing in various fields. Battery cells are systems that can be combined to utilize new renewable energy.

[0005] In the field of battery equipment technology, the production efficiency of battery cells is low.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can facilitate the assembly and molding of the battery cell and improve the production efficiency of the battery cell.

[0008] In a first aspect of the present application, a battery cell is provided, comprising a housing, an end cap, and an electrode terminal. The housing has an opening, the end cap is used to cover the opening, the electrode terminal is disposed on the housing, and the end cap is the largest wall of the battery cell.

[0009] By adopting the above structure, by setting the end cover as the wall with the largest area on the battery cell, the area of ​​the opening can be increased, making it easier for the structure inside the battery cell to enter the shell. At the same time, the electrode terminals are set on the shell, which increases the assembly speed during assembly and thereby accelerates the production efficiency of the battery cell.

[0010] In some optional embodiments of the present application, the battery cell further includes an electrode assembly, which is disposed in the shell; the electrode assembly includes a main body and a tab extending from the main body, and the arrangement direction of the tab and the main body is perpendicular to the thickness direction of the end cover.

[0011] By adopting the above structure, the arrangement direction of the tabs and the main body is perpendicular to the thickness direction of the end cover, thereby reducing the space occupied by the tabs and improving the energy density.

[0012] In some optional embodiments of the present application, the shell includes a first wall and a second wall that intersect each other, the area of ​​the second wall is larger than the area of ​​the first wall and smaller than the area of ​​the end cover, and the electrode terminal is arranged on the first wall; the end surface of the main body extending out of the electrode ear faces the second wall.

[0013] By adopting the above structure, the wetting area of ​​the electrode assembly can be increased as much as possible, thereby improving the wetting effect.

[0014] In some optional embodiments of the present application, the battery cell further includes a connecting component for connecting the electrode terminal and the tab.

[0015] With the above structure, by providing a connecting component, it is possible to facilitate connection of the tab to the electrode terminal.

[0016] In some optional embodiments of the present application, the connecting component includes a first connecting portion and a second connecting portion, the first connecting portion is used to connect the electrode terminal, and the second connecting portion is used to connect the electrode tab.

[0017] With the above structure, by providing the first connecting portion and the second connecting portion, the locations on the connecting component for connecting the electrode terminal and the tab can be made relatively independent, making it easier to provide a structure for connecting the electrode terminal and the tab on the connecting component.

[0018] In some optional embodiments of the present application, the connecting component is L-shaped.

[0019] With the above structure, by setting the connecting component in an L shape, the connecting component can be easily set at the corner where the first wall and the second wall meet, fully utilizing the remaining space in the shell and improving the energy density of the battery cell.

[0020] In some optional embodiments of the present application, along the thickness direction of the end cover, the shell has two openings arranged opposite to each other, and the battery cell includes two end covers, and the two end covers are correspondingly arranged at the two openings.

[0021] By adopting the above structure and providing two openings, the operating space on the housing during assembly can be further increased, thereby improving assembly efficiency.

[0022] In some optional embodiments of the present application, along the thickness direction of the second wall, the size of the main body of the electrode assembly is H1, and the size of the shell is H2, satisfying H1 / H2≥0.8.

[0023] By adopting the above structure and constraining the ratio H1 / H2, the main body can occupy as much internal space of the battery cell as possible, reducing the space occupied by other components of the battery cell (such as connecting components), and improving the space utilization and energy density of the battery cell.

[0024] In some optional embodiments of the present application, the electrode assembly is a wound electrode assembly, and along the first direction, the size of the electrode assembly is L, satisfying 300mm≤L≤800mm, and the first direction is perpendicular to the thickness direction of the end cover and the thickness direction of the second wall.

[0025] By adopting the above structure, by constraining the size of the electrode assembly along the first direction, the problem of L being too small, resulting in low energy density of the battery cell, can be reduced; the problem of L being too large, resulting in increased difficulty in processing the electrode assembly and reduced production efficiency of the electrode assembly can also be reduced.

[0026] In some optional embodiments of the present application, along the thickness direction of the end cover, the size of the electrode assembly is D, satisfying 10 mm ≤ D ≤ 80 mm.

[0027] By adopting the above structure, by constraining the size of the electrode assembly along the thickness direction, the problem of D being too small, resulting in low energy density of the battery cell, can be reduced; the problem of D being too large, resulting in increased difficulty in processing the electrode assembly and reduced production efficiency of the electrode assembly can also be reduced.

[0028] According to a second aspect of the embodiments of the present application, a battery is provided, comprising the above-mentioned battery cell.

[0029] According to a third aspect of the embodiments of the present application, there is provided an electrical device comprising the above-mentioned battery cell for providing electrical energy.

[0030] Compared with the related art, in the battery cell, battery and electrical device of the embodiments of the present application, by setting the end cover as the wall with the largest area on the battery cell, the area of ​​the opening can be increased, which facilitates the structure inside the battery cell to enter the shell, improves the assembly speed during assembly, and thus accelerates the production efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. 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 creative work.

[0032] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0033] FIG2 is a schematic diagram of the structure of a battery provided in some embodiments of the present application.

[0034] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application.

[0035] FIG4 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application.

[0036] FIG5 is a schematic side view of the structure of a battery cell provided in some embodiments of the present application.

[0037] FIG6 is a schematic cross-sectional view along AA in FIG5 .

[0038] FIG. 7 is an enlarged schematic diagram of the first wall in FIG. 6 .

[0039] FIG8 is an enlarged schematic diagram of the electrode terminal in FIG6 .

[0040] FIG9 is a schematic structural diagram of an electrode assembly provided in some embodiments of the application.

[0041] In the accompanying drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 110, casing; 111, first casing portion; 112, second casing portion; 10, battery cell; 1, shell; 11, opening; 12, first wall; 13, second wall; 2, end cover; 3, electrode terminal; 4, electrode assembly; 41, main body; 42, tab; 43, end face; 5, connecting component; 51, first connecting portion; 52, second connecting portion. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] The following embodiments of the technical solution of the present application are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0045] In the description of the implementation methods of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0046] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent:

[0048] There are three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next related objects are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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. Therefore, they should not be understood as limiting the embodiments of the present application.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0052] In the development of battery technology, it is necessary not only to consider various design factors, but also the battery production process, such as production efficiency and production safety. Among them, production efficiency in battery production has become one of the important obstacles restricting the further development of batteries.

[0053] The inventors noted that a battery cell includes a housing that forms a storage space. The housing typically has an opening for placing the internal structure of the battery cell into the storage space. However, to increase the energy density of the battery cell, the internal structure of the battery cell is relatively compact, making the assembly process of the internal structure into the housing difficult, seriously affecting the production efficiency of the battery cell.

[0054] In order to alleviate the technical problem of low battery cell production efficiency, the inventors have discovered that by adjusting the position of the opening on the shell, the opening's passing area can be expanded to facilitate the internal structure of the battery cell to enter the shell, thereby increasing the assembly speed and accelerating the production efficiency of the battery cell.

[0055] Based on the above considerations, the inventors of the present application have conducted in-depth research and designed a battery cell, a battery and an electrical device.

[0056] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0057] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0058] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0059] As shown in Figure 1, Figure 1 is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, 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 driving the vehicle 1000.

[0060] In some embodiments of the present application, 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.

[0061] In the embodiments of the present application, the battery mentioned herein refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned herein may include a battery module or a battery pack.

[0062] As shown in Figure 2, Figure 2 is a schematic structural diagram of the battery 100 provided in some embodiments of the present application. In some embodiments of the present application, the battery 100 includes a housing 110, and the housing 110 may include a first housing portion 111 and a second housing portion 112 connected to each other. A plurality of battery cells are connected in parallel, in series, or in a mixed combination and placed in a space formed by the connection of the first housing portion 111 and the second housing portion 112. The shape of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the combination of the plurality of battery cells. The battery cell may be flat, rectangular or in other shapes, etc., which is not limited in the embodiments of the present application. The packaging methods of the battery cell include but are not limited to cylindrical battery cells, square battery cells and soft-pack battery cells, etc., which are not specifically limited in the embodiments of the present application. In addition, the battery 100 may also include other structures, such as a busbar component, which is used to realize electrical connection between multiple battery cells, which will not be described one by one here.

[0063] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application, and Figure 4 is a schematic diagram of the structure of a battery cell provided in other embodiments of the present application. As shown in Figures 3 and 4, some optional embodiments of the present application provide a battery cell 10, comprising a housing 1, an end cap 2, and an electrode terminal 3. The housing 1 has an opening 11, and the end cap 2 is used to cover the opening 11. The electrode terminal 3 is disposed on the housing 1, and the end cap 2 is the largest wall of the battery cell.

[0064] The housing 1 is a component used to form a housing for the battery cells. This housing can accommodate the internal structure of the battery cells. For example, the shape of the housing 1 can be determined based on the specific shape of the electrode assembly 4. The housing 1 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this embodiment of the present application does not impose any particular limitations on this.

[0065] The electrode terminal 3 is used for electrical connection to the outside world, and power is drawn out of or into the battery cell 10. For example, one end of the electrode terminal 3 is disposed inside the housing 1 and connected to the internal structure of the battery cell 10, and the other end is disposed outside the housing 1.

[0066] The end cover 2 is used to cover the opening 11 of the housing 1 and form a sealed connection to form a sealed space for accommodating the internal structure of the battery cell.

[0067] By setting the end cover 2 as the wall with the largest area on the battery cell 10, the area of ​​the opening 11 can be increased, making it easier for the structure inside the battery cell 10 to enter the shell 1, thereby increasing the assembly speed during assembly and further accelerating the production efficiency of the battery cell 10.

[0068] 3 and 4 , optionally, the shell 1 may be a hollow structure with an opening 11 on one side, or a hollow structure with openings 11 on two opposite sides. By way of example, taking a rectangular battery as an example, the opening 11 of the shell 1 is provided on one or two walls with the largest area on the rectangular battery, and the end cover 2 covers the opening 11. By way of example, the aforementioned wall refers to a wall-shaped structure used to enclose and form a space, such as a square battery cell having six walls. By way of example, when two openings 11 are provided, two end covers 2 may also be provided, and one end cover 2 corresponds to covering one opening 11 of the shell 1 and forming a sealed connection to form a sealed space for accommodating the internal structure of the battery cell 10.

[0069] 3 and 4 , the area of ​​the end cap 2 can optionally be larger than the area of ​​the remaining surfaces of the battery cell. For example, in the case of a rectangular battery, the end cap 2 can completely cover the largest wall on the rectangular battery, or it can partially cover the largest wall on the rectangular battery.

[0070] Optionally, the electrode terminal 3 may include a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are respectively used to electrically connect to the positive electrode tab and the negative electrode tab of the electrode assembly.

[0071] Figure 5 is a schematic diagram of the side structure of a battery cell provided in some embodiments of the present application. Figure 6 is a schematic diagram of a cross-section along AA in Figure 5. Figure 7 is an enlarged schematic diagram of the first wall 12 in Figure 6. Figure 8 is an enlarged schematic diagram of the electrode terminal 3 in Figure 6. As shown in Figures 3, 5 to 8, in some optional embodiments of the present application, the battery cell further includes an electrode assembly 4, which is disposed in the shell 1; the electrode assembly 4 includes a main body 41 and a tab 42 extending from the main body 41, and the arrangement direction of the tab 42 and the main body 41 (the y-axis direction in the figure) is perpendicular to the thickness direction of the end cover 2 (the x-axis direction in the figure).

[0072] The electrode assembly 4 refers to the component in a battery cell that is used for electrochemical reactions. For example, the electrode assembly 4 is primarily formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body 41 of the electrode assembly 4, while the portions of the positive and negative electrode sheets without active material each constitute a tab 42. During the charge and discharge process of the battery cell, the positive and negative electrode active materials react with the electrolyte within the battery cell, and the tab 42 is electrically connected to the electrode terminal 3 to form a current circuit.

[0073] By arranging the tabs 42 and the main body 41 perpendicular to the thickness direction of the end cap 2, the end face of the lead tab 42 does not correspond to the largest face of the battery cell (i.e., the end cap 2), which significantly reduces the space waste caused by the lead tab 42 and improves the energy density.

[0074] For example, taking a rectangular battery as an example, it includes two large walls with the largest area, two middle walls with the second largest area, and two small walls with the smallest area. The end face 43 extending from the tab 42 can be one of the end faces 43 facing the middle wall or the small wall.

[0075] Optionally, one or more electrode assemblies 4 may be provided.

[0076] As shown in Figures 6 to 8, in some optional embodiments of the present application, the shell 1 includes an intersecting first wall 12 and a second wall 13, the area of ​​the second wall 13 is larger than the area of ​​the first wall 12 and smaller than the area of ​​the end cover 2, and the electrode terminal 3 is arranged on the first wall 12; the end surface 43 of the main body 41 extending out of the tab 42 faces the second wall 13.

[0077] By arranging the electrode terminal 3 on the first wall 12 and the area of ​​the second wall 13 being larger than the area of ​​the first wall 12, the area of ​​the end face of the lead-out tab 42 and the end face opposite to the end face can be made larger, thereby facilitating the entry of liquid (such as electrolyte) into the electrode assembly 4, and the wetting area of ​​the electrode assembly 4 can be increased as much as possible, thereby improving the wetting effect.

[0078] For example, taking a rectangular battery as an example, it includes two large walls with the largest area, two middle walls with the second largest area, and two small walls with the smallest area. One of the first wall 12 and the second wall 13 can be the middle wall or the small wall, and the other of the first wall 12 and the second wall 13 can be the other of the middle wall or the small wall.

[0079] As shown in Figures 6 to 8, in some optional embodiments of the present application, the battery cell further includes a connecting component 5 for connecting the electrode terminal 3 and the tab 42. The provision of the connecting component 5 facilitates the connection of the tab 42 to the electrode terminal 3.

[0080] Optionally, the connecting component 5 may be a connecting piece made of a conductive material.

[0081] In some optional embodiments of the present application, the connecting component 5 includes a first connecting portion 51 and a second connecting portion 52, wherein the first connecting portion 51 is used to connect to the electrode terminal 3, and the second connecting portion 52 is used to connect to the tab 42. By providing the first connecting portion 51 and the second connecting portion 52, the portions of the connecting component 5 for connecting to the electrode terminal 3 and the tab 42 can be relatively independent, making it easier to provide a structure for connecting the electrode terminal 3 and the tab 42 on the connecting component 5.

[0082] Optionally, the first connection part 51 and the second connection part 52 can be integrally formed or separately provided. Exemplarily, the first connection part 51 and the second connection part 52 can be connected by one of a welding structure, a conductive adhesive bonding structure or a riveted structure. Conductive connection through a welding structure refers to connecting the first connection part 51 and the second connection part 52 by welding means such as laser welding. Conductive connection through a conductive adhesive bonding structure refers to bonding the first connection part 51 and the second connection part 52 by using a conductive adhesive. The conductive adhesive can be a conductive adhesive film. The conductive adhesive can not only achieve an electrical connection between the first connection part 51 and the second connection part 52, but also achieve a mechanical connection between the two. Conductive connection through a riveted structure refers to the first connection part 51 and the second connection part 52 being connected to each other by rivets.

[0083] Optionally, the tab 42 may be disposed between the second connecting portion 52 and the second wall 13 , so that the tab 42 can be bent and wrapped around the surface of the second connecting portion 52 , thereby increasing the contact area between the second connecting portion 52 and the tab 42 .

[0084] As shown in FIG. 6 to FIG. 8 , in some optional embodiments of the present application, the connecting component 5 is L-shaped.

[0085] By configuring the connecting component 5 to be L-shaped, the connecting component 5 can be conveniently disposed at the corner where the first wall 12 and the second wall 13 meet, thereby fully utilizing the remaining space in the housing 1 and improving the energy density of the battery cell.

[0086] As shown in FIG4 , in some optional embodiments of the present application, the housing 1 has two openings 11 disposed opposite each other along the thickness direction of the end cap 2 (the x-axis direction in the figure). The battery cell includes two end caps 2, and the two end caps 2 are disposed at the two openings 11. The provision of two openings 11 can further increase the operating space on the housing 1 during assembly, thereby improving assembly efficiency.

[0087] FIG9 is a schematic diagram of the structure of the electrode assembly 4 provided in some embodiments of the present application. As shown in FIG3 and FIG6 to FIG9, in some optional embodiments of the present application, along the thickness direction of the second wall 13 (the x-axis direction in the figure), the size of the main body 41 of the electrode assembly 4 is H1, and the size of the shell 1 is H2, satisfying H1 / H2 ≥ 0.8. By constraining the ratio of H1 / H2, the main body can occupy as much internal space of the battery cell as possible, reducing the space occupied by other components of the battery cell (such as connecting components), and improving the space utilization and energy density of the battery cell.

[0088] Optionally, the size of the main body 41 of the electrode assembly 4 is H1, and the size of the shell 1 is H2, satisfying H1 / H2≥0.9.

[0089] Optionally, the size of the main body 41 of the electrode assembly 4 is H1, and the size of the shell 1 is H2, satisfying that H1 / H2 is equal to 0.85, 0.9 or 0.95.

[0090] As shown in Figures 3, 6, and 9, in some optional embodiments of the present application, the electrode assembly is a wound electrode assembly. Along a first direction (the z-axis in the figure), the dimension L of the electrode assembly 4 satisfies the following conditions: 300 mm ≤ L ≤ 800 mm. The first direction is perpendicular to the thickness direction of the end cap 2 (the x-axis in the figure) and the thickness direction of the second wall 13 (the y-axis in the figure). The wound electrode assembly 4 has high production efficiency. By constraining the dimension of the electrode assembly in the first direction, it can reduce the problem of L being too small, resulting in low energy density of the battery cell; it can also reduce the problem of L being too large, which increases the difficulty of processing the electrode assembly and reduces the production efficiency of the electrode assembly.

[0091] Optionally, along the first direction, the size of the electrode assembly 4 is L, satisfying 500 mm ≤ L ≤ 550 mm.

[0092] Optionally, along the first direction, the dimension of the electrode assembly 4 is L, and L is equal to 400 mm, 500 mm, 600 mm or 700 mm.

[0093] As shown in Figures 3, 6 to 9, in some optional embodiments of the present application, the size of the electrode assembly 4 along the thickness direction of the end cap 2 (x-axis direction in the figure) is D, satisfying 10mm≤D≤80mm. When there is one electrode assembly 4, the size of one electrode assembly 4 is D, 10mm≤D≤80mm. When there are multiple electrode assemblies 4, multiple electrode assemblies are arranged along the thickness direction of the end cap 2 (x-axis direction in the figure), and D is the total size of the multiple electrode assemblies 4 along the thickness direction of the end cap 2 (x-axis direction in the figure). By constraining the size of the electrode assembly along the thickness direction, the problem of D being too small, resulting in low energy density of the battery cell, can be reduced; the problem of D being too large, resulting in increased difficulty in processing the electrode assembly and reduced production efficiency of the electrode assembly can also be reduced. Optionally, the size of the electrode assembly 4 along the thickness direction of the end cap 2 is D, satisfying 40mm≤D≤50mm.

[0094] Optionally, along the thickness direction of the end cover 2 , the size of the electrode assembly 4 is D, which satisfies that D is equal to 20 mm, 30 mm, 40 mm, 50 mm, 60 mm and 70 mm.

[0095] According to a second aspect of the embodiments of the present application, a battery is provided, comprising the above-mentioned battery cell.

[0096] According to a third aspect of the embodiments of the present application, there is provided an electrical device comprising the above-mentioned battery cell for providing electrical energy.

[0097] In some optional embodiments of the present application, a battery cell is provided, comprising a housing 1, an end cap 2, and an electrode terminal 3. The housing 1 has an opening 11, and the end cap 2 is used to cover the opening 11. The electrode terminal 3 is disposed on the housing 1, and the end cap 2 is the wall with the largest area of ​​the battery cell. The battery cell also includes an electrode assembly 4, which is disposed within the housing 1. The electrode assembly 4 includes a main body 41 and a tab 42 extending from the main body 41. The tab 42 and the main body 41 are arranged perpendicular to the thickness of the end cap 2. The housing 1 includes a first wall 12 and a second wall 13 intersecting therebetween. The electrode terminal 3 is disposed on the first wall 12. The end face 43 of the tab 42 extending from the main body 41 faces the second wall 13. The battery cell also includes an L-shaped connecting member 5 for connecting the electrode terminal 3 to the tab 42. The housing 1 has two openings 11 disposed opposite each other along the thickness of the end cap 2. The battery cell includes two end caps 2, which are disposed at the two openings 11, respectively. Along the thickness direction of the second wall 13, the main body 41 of the electrode assembly 4 has a dimension H1, and the housing 1 has a dimension H2, satisfying H1 / H2 ≥ 0.9. Along the first direction, the electrode assembly 4 has a dimension L, satisfying 490 mm ≤ L ≤ 510 mm. The first direction is perpendicular to the thickness direction of the end cap 2 and the thickness direction of the second wall 13. Along the thickness direction of the end cap 2, the electrode assembly 4 has a dimension D, satisfying 45 mm ≤ D ≤ 55 mm.

[0098] Compared with the related art, in the battery cell, battery and electrical device of the embodiment of the present application, by setting the end cover 2 as the wall with the largest area on the battery cell, the area of ​​the opening 11 can be increased, which facilitates the structure inside the battery cell to enter the shell 1, improves the assembly speed during assembly, and thus accelerates the production efficiency of the battery cell.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising: a housing having an opening; An end cover, used to cover the opening; An electrode terminal is disposed on the housing; The end cover is the wall with the largest area of ​​the battery cell.

2. The battery cell according to claim 1, wherein: The battery cell further includes an electrode assembly, and the electrode assembly is disposed in the housing; The electrode assembly includes a main body and a tab extending from the main body, and an arrangement direction of the tab and the main body is perpendicular to a thickness direction of the end cover.

3. The battery cell according to claim 2, wherein: The shell includes a first wall and a second wall intersecting each other, the area of ​​the second wall is larger than the area of ​​the first wall and smaller than the area of ​​the end cover, the electrode terminal is arranged on the first wall; the end surface of the main body extending out of the pole ear faces the second wall.

4. The battery cell according to claim 3, wherein: The battery cell further includes a connecting component for connecting the electrode terminal and the electrode tab.

5. The battery cell according to claim 4, wherein: The connecting component includes a first connecting portion and a second connecting portion, the first connecting portion is used to connect the electrode terminal, and the second connecting portion is used to connect the electrode tab.

6. The battery cell according to claim 5, wherein: The connecting component is L-shaped.

7. The battery cell according to any one of claims 3 to 6, wherein: Along the thickness direction of the end cover, the shell has two openings arranged opposite to each other, and the battery cell includes two end covers, and the two end covers are correspondingly arranged at the two openings.

8. The battery cell according to any one of claims 3 to 7, wherein: Along the thickness direction of the second wall, the size of the main body of the electrode assembly is H1, and the size of the shell is H2, satisfying H1 / H2≥0.

8.

9. The battery cell according to any one of claims 3 to 7, wherein: The electrode assembly is a wound electrode assembly. Along a first direction, the size of the electrode assembly is L, satisfying 300mm≤L≤800mm. The first direction is perpendicular to the thickness direction of the end cover and the thickness direction of the second wall.

10. The battery cell according to any one of claims 2 to 7, wherein: Along the thickness direction of the end cover, the dimension of the electrode assembly is D, satisfying 10 mm ≤ D ≤ 80 mm.

11. A battery comprising the battery cell according to any one of claims 1 to 10.

12. An electrical device comprising the battery cell according to any one of claims 1 to 10, for providing electrical energy.

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