Battery cell, battery, and electrical apparatus

Abstract

A battery cell (10), a battery (100), and an electrical apparatus. The battery cell (10) comprises a housing (11) and a post (12). The housing (11) comprises a first wall portion (111) and a second wall portion (112), the first wall portion (111) and the second wall portion (112) being disposed adjacent to each other. The first wall portion (111) comprises a first main body portion (1111) and a first protruding portion (1112), the first protruding portion (1112) protruding from an outer surface of the first main body portion (1111) in the thickness direction (X) of the first wall portion (111). The second wall portion (112) comprises a second main body portion (1121) and a first extension portion (1122), the first extension portion (1122) being located on a side of the second main body portion (1121) close to the first wall portion (111). The first main body portion (1111) is connected to the second main body portion (1121), the first protruding portion (1112) is connected to the first extension portion (1122) to form a protrusion (10a) on the surface of the housing (11), and the post (12) is disposed on the protrusion (10a). The present battery cell (10) helps to increase the volume of the protrusion (10a), thereby facilitating improvement of the capacity of the battery cell (10) and facilitating improvement of the space utilization rate in the battery cell (10); additionally, the protrusion (10a) can be provided even when the size of the battery cell (10) is small.

Description

Battery cell, battery and power-consuming device Technical Field

[0001] The embodiments of the present disclosure relate to the field of battery technology, and particularly to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, batteries have been used more and more widely in life and industry.

[0003] A battery is equipped with multiple cells. To increase the number of cells within a limited space, and thus the battery's capacity, the width of the cells is required to be smaller and smaller, allowing for more cells to be arranged along the width of the cells. Furthermore, to improve space utilization within the battery, protrusions are provided on the outer surface of the battery to increase the volume of the cells.

[0004] As the size of battery cells decreases, the area on the outer surface of the battery available for arranging protrusions becomes smaller and smaller, resulting in the protrusions becoming smaller and smaller. This is not conducive to arranging other components of the battery cells inside the protrusions, nor is it conducive to the manufacture of the protrusions.

[0005] Summary of the Invention

[0006] In view of this, the embodiments of the present disclosure aim to provide a battery cell, a battery, and an electrical device that can increase the size of the protrusion while maintaining the size of the battery cell.

[0007] To achieve the above objectives, the technical solution of the embodiment of the present disclosure is implemented as follows:

[0008] An embodiment of the present disclosure provides a battery cell, comprising:

[0009] The housing includes a first wall portion and a second wall portion, the first wall portion being adjacent to the second wall portion, the first wall portion including a first main portion and a first protrusion, the first protrusion protruding from the outer surface of the first main portion along the thickness direction of the first wall portion; the second wall portion including a second main portion and a first extension portion, the first extension portion being located on a side of the second main portion close to the first wall portion, the first main portion being connected to the second main portion, and the first protrusion being connected to the first extension portion to form a protrusion on the housing surface;

[0010] The pole is arranged on the protrusion.

[0011] The battery cell in the embodiment of the present disclosure has a protrusion on the outer shell surface formed by parts of two different wall portions, which is beneficial for increasing the size of the protrusion along the thickness direction of the second wall portion when the three-dimensional size of the battery cell is constant, thereby facilitating an increase in the volume of the protrusion, and further facilitating an increase in the capacity of the battery cell, and improving the space utilization within the battery cell. Even when the size of the battery cell is small, the protrusion can be arranged.

[0012] In some embodiments, the number of each of the first protrusions and the first extensions is multiple, and the two are arranged in a one-to-one correspondence. This facilitates the adaptation of the multiple first protrusions and the multiple first extensions to form a plurality of protrusions, so that the number of the multiple protrusions is consistent with the number of protruding parts of the electrode assembly, thereby improving the adaptability of the protrusions and facilitating improved space utilization within the battery cell.

[0013] In some embodiments, the battery cell further includes a tab, at least a portion of which is located within the protrusion. This facilitates adapting the shape of the space within the housing to the arrangement of the protruding portion of the electrode assembly, reducing the likelihood of interference between the tab and the first and second walls, and improving space utilization within the battery cell.

[0014] In some embodiments, the battery cell further includes an adapter that electrically connects the tab to the terminal post, with at least a portion of the adapter located within the protrusion. This facilitates adapting the shape of the space within the housing to the arrangement of the protruding portion of the electrode assembly, reduces the likelihood of interference between the adapter and the first and second walls, and improves space utilization within the battery cell.

[0015] In some embodiments, the battery cell further includes an electrode assembly, which is disposed within the housing and electrically connected to the terminal post. The number of electrode assemblies is one or two. Thus, the protrusions are adapted to the overall outer dimensions of the smaller housing, resulting in a smaller overall outer profile for the battery cell. By arranging the protrusions, the volume of the battery cell is increased, thereby improving the energy density of the battery cell.

[0016] In some embodiments, the housing further includes a third wall portion, the third wall portion and the second wall portion being located on opposite sides of the first wall portion, the third wall portion including a third main body portion and a second extension portion, the first main body portion being connected to the third main body portion, the second extension portion being located on a side of the third main body portion closer to the first wall portion, and the first protrusion portion being connected to the second extension portion such that the second extension portion forms a portion of the protrusion. This facilitates further increasing the dimension of the protrusion perpendicular to its protruding direction, thereby increasing the volume of the protrusion, thereby increasing the capacity of the battery cell and improving the space utilization within the battery cell.

[0017] In some embodiments, the housing further includes a fourth wall portion, the fourth wall portion including a fourth main portion and a third extension portion, the fourth main portion being located on one side of and connected to the second main portion, the third extension portion being located on a side of the fourth main portion proximal to the first wall portion, and the first protrusion being connected to the third extension portion such that the third extension portion forms a portion of the protrusion. This facilitates further increasing the dimension of the protrusion perpendicular to its protruding direction, thereby increasing the volume of the protrusion, thereby increasing the capacity of the battery cell and improving the space utilization within the battery cell.

[0018] In some embodiments, the third extension is located on one side of the first extension and the two are connected. This helps further increase the size of the protrusion perpendicular to its protruding direction, thereby increasing the volume of the protrusion, thereby increasing the capacity of the battery cell and improving the space utilization within the battery cell.

[0019] In some embodiments, the housing further comprises a fifth wall portion, the fifth wall portion being located on a side of the housing away from the first wall portion, the fifth wall portion comprising a fifth main portion and a second protrusion, the second wall portion further comprising a fourth extension portion, the fourth extension portion being located on a side of the second main portion closer to the fifth wall portion, the fifth main portion being connected to the second main portion, and the second protrusion being connected to the first extension portion to form the protrusion on the housing surface. This facilitates greater flexibility in the arrangement of battery cells within the battery, while also reducing the likelihood of short circuits caused by accidental contact between the poles due to increased spacing between the poles on the protrusion.

[0020] In some embodiments, the outer surface of the second wall portion is the largest surface area of ​​the outer surface of the housing. This ensures that the protrusion's protrusion direction is not in the same direction as the normal direction of the larger surface, thereby reducing the probability of the protrusion interfering with the arrangement of battery cells and other components in the battery.

[0021] In some embodiments, the number of the poles is two, and the two poles are located on the same protrusion. In this way, only one protrusion needs to be manufactured to arrange the two poles, which is conducive to simplifying the manufacturing steps of the housing and reducing production costs.

[0022] Alternatively, the number of the protrusions is two, and the two poles are respectively located on one protrusion, so as to reduce the probability of electrical connection between the two poles causing a short circuit.

[0023] In some embodiments, the protrusion is located at the center of the first wall portion along the length direction of the first wall portion. This helps to make the outer contour of the battery cell symmetrical, facilitates the adjustment of the placement direction of multiple battery cells when arranged in the battery, and improves the adaptability of the battery cells; and helps to shorten the distance between the positive electrode column and the negative electrode column of two adjacent battery cells, and facilitates electrical connection between different battery cells.

[0024] Alternatively, the protrusion is located at one end of the first wall portion along the length direction of the first wall portion. This is beneficial for the first main body portion to form a complete surface with a larger area, which is convenient for the arrangement between other devices in the battery and the battery cells, and is beneficial for improving the utilization rate of the space inside the battery.

[0025] In some embodiments, the housing includes a shell and a cover plate. A mounting cavity is provided in the shell, one side of the mounting cavity is open, and the cover plate is provided to cover the opening of the mounting cavity. The cover plate and the first wall portion are arranged opposite to each other. In this way, the first wall portion and the second wall portion can be simultaneously prepared and formed during the preparation of the shell, which is conducive to improving production efficiency and reducing production costs.

[0026] Alternatively, the cover plate forms the second wall portion, which is conducive to reducing the difficulty of forming the first protrusion on the shell and the difficulty of preparing the second wall portion, and is conducive to reducing the production cost of the shell and improving production efficiency.

[0027] In some embodiments, the housing includes a shell and a cover plate, an installation cavity is provided in the shell, one side of the installation cavity is opened to form a first opening, the cover plate is covered on the first opening, and the cover plate forms the first wall portion. In this way, the stamping direction for stamping the first protrusion is the same as the thickness direction of the cover plate, which reduces the difficulty of stamping the first protrusion, is conducive to reducing the size of the stamping die, reducing production costs, and improving production efficiency.

[0028] In some embodiments, the cover plate abuts against the shell along its covering direction. This is beneficial for welding from a side perpendicular to the protruding direction of the first protrusion during the welding process, which can reduce the adjustment of the welding equipment, especially the adjustment of the focal length of the laser welding equipment, and thus helps to simplify the welding process steps and improve production efficiency.

[0029] In some embodiments, the edge of the housing protrudes along the direction in which the cover plate is installed to form a flange portion, the first protrusion protrudes in a direction away from the housing, the first protrusion opens toward one side of the housing to form a second opening, the first protrusion opens toward the second wall portion to form a third opening, the second opening communicates with the mounting cavity, the first extension portion closes the third opening, and at least a portion of the flange portion forms the first extension portion. This, on the one hand, reduces the risk of cracking of the first protrusion during the stamping process, reduces the difficulty in manufacturing the first protrusion, and helps improve the yield rate of cover plate production; on the other hand, even if the cover plate is small in the direction in which the third opening is opened, the first protrusion is easily formed, which helps increase the volume of the first protrusion, and thus helps increase the volume of the protrusion.

[0030] In some embodiments, the first protrusion is open on both sides perpendicular to the covering direction of the cover plate to form two third openings. This further reduces the difficulty of processing and manufacturing the first protrusion, which is beneficial to improving the yield rate of cover plate production; it is convenient to stamp a smaller-sized cover plate to form the first protrusion, which is further beneficial to increase the volume of the protrusion.

[0031] In some embodiments, the first protrusion is located at at least one end of the first main body along the first direction, the first protrusion is opened on one side away from the first main body along the first direction to form the fourth opening, and the first protrusion is opened on at least one side along the second direction to form the third opening. The covering direction of the cover plate, the first direction and the second direction are perpendicular to each other, and the flange portion is located at at least one end of the shell along the first direction. The flange portion closes the third opening and the fourth opening to form the protrusion together with the first protrusion portion. This is further beneficial to reducing the difficulty requirements of the manufacturing process of the first protrusion, and at the same time, it is beneficial to further increase the volume of the protrusion when the size of the cover plate is limited.

[0032] In some embodiments, the cover plate abuts against the shell along its covering direction, and the abutment position of the first main body and the shell forms a first seam, and the abutment position of the first protrusion perpendicular to the covering direction of the cover plate and the flange portion forms a second seam, and the extension direction of the first seam and the extension direction of the second seam are in the range of 95° to 145°. Thus, within this angle range, on the one hand, it is beneficial to increase the size of the flange portion along the protruding direction of the first protrusion within a limited size range, which is beneficial to increase the volume of the protrusion; on the other hand, it is beneficial to reduce the change in the angle of the welding equipment during the switching process between welding the first seam and the second seam, which is beneficial to improve the efficiency and quality of the welding work.

[0033] In some embodiments, the second wall portion is located on one side of the first wall portion along the width direction of the first wall portion, and the width of the first wall portion ranges from 10 mm to 60 mm. This, on the one hand, facilitates a smaller outer shell dimension, facilitating an increase in the number of battery cells within the battery, thereby improving the battery's energy density; on the other hand, arranging the protrusion within this dimension range helps reduce the difficulty of manufacturing the protrusion.

[0034] In some embodiments, the size of the first protrusion along its protruding direction ranges from 1 mm to 10 mm. This helps ensure that the space inside the protrusion meets the requirements for arranging the protruding portion of the electrode assembly, and at the same time helps reduce the adverse effects of the protrusion size on the arrangement of other components in the battery.

[0035] And / or, the size range of the first extension portion along the protruding direction of the first protrusion is 1 mm to 10 mm, which is conducive to ensuring that the space inside the protrusion meets the requirements for arranging the protruding part of the electrode assembly, and at the same time, is conducive to reducing the adverse effects of the size of the protrusion on the arrangement of other devices in the battery.

[0036] An embodiment of the present disclosure also provides a battery, which includes a box body and the battery cell of any one of the aforementioned embodiments, wherein a accommodating space is provided in the box body, and the battery cell is arranged in the accommodating space. An accommodating cavity is provided on an inner wall of one side of the accommodating space, and the accommodating cavity is communicated with the accommodating space, and at least a portion of the protrusion is accommodated in the accommodating cavity. In this way, the space inside the battery can better adapt to the outer contour of the battery cell, which is beneficial to improving the utilization rate of the space inside the battery and improving the energy density inside the battery.

[0037] In some embodiments, a boss is provided on the outer surface of the box body, and the boss is located on the side of the accommodating cavity away from the accommodating space. This is beneficial to increase the volume of the accommodating cavity while reducing the outer contour size of the battery, thereby increasing the energy density of the battery.

[0038] An embodiment of the present disclosure also provides an electrical device, which includes the battery in the aforementioned embodiment, and the battery serves as the power source of the electrical device. In this way, the protrusion is formed by the first extension portion and the first protrusion portion, which increases the volume of the protrusion of the battery cell under a limited size, thereby facilitating an increase in the space utilization rate and battery capacity of the electrical device.

[0039] In some embodiments, the electrical device is a vehicle, which also includes a seat, and the accommodating cavity is located on the side of the box body facing the seat. This is beneficial to increasing the volume of the battery in the vehicle, thereby increasing the battery capacity and improving the vehicle's cruising range; at the same time, it is beneficial to make the flat box wall of the box body face the ground side, which is beneficial to making the bottom surface of the vehicle flatter, reducing the vehicle's drag coefficient and increasing the vehicle's ground clearance.

[0040] In some embodiments, a boss is provided on the outer surface of the box body, and the boss is located on the side of the accommodating cavity away from the accommodating space. This is beneficial to further increase the volume of the accommodating cavity, thereby helping to increase the capacity of the battery.

[0041] In some embodiments, the electrical device is a vehicle, further comprising a support plate, wherein a surface of the support plate facing the battery cell is recessed to form an installation space, and at least a portion of the terminal is located in the installation space;

[0042] And / or, at least a portion of the protrusion is located in the installation space. This helps increase the volume of the battery in the vehicle, thereby increasing the battery capacity. At the same time, the support plate can provide shielding and protection, reducing the adverse effects of battery problems on people or devices in the space on the side of the support plate away from the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a schematic diagram of a vehicle using a battery device according to an embodiment of the present disclosure;

[0044] FIG2 is a schematic diagram of an explosion of a battery in one embodiment of the present disclosure;

[0045] FIG3 is a schematic diagram of a battery cell in the first embodiment of the present disclosure at a first viewing angle;

[0046] FIG4 is a schematic diagram of the embodiment in FIG3 at a second viewing angle;

[0047] FIG5 is a partial enlarged schematic diagram of position A in FIG4 ;

[0048] FIG6 is a schematic diagram of the embodiment in FIG3 at a third viewing angle;

[0049] FIG7 is a partial enlarged schematic diagram of position B in FIG6;

[0050] FIG8 is a schematic diagram of the housing of the embodiment in FIG3 ;

[0051] FIG9 is a schematic diagram of a battery cell in the second embodiment of the present disclosure at a fourth viewing angle;

[0052] FIG10 is an exploded schematic diagram of the embodiment in FIG9 ;

[0053] FIG11 is a schematic diagram of the housing of the embodiment in FIG9 ;

[0054] FIG12 is a schematic diagram of the embodiment in FIG9 at a fifth viewing angle;

[0055] FIG13 is a schematic cross-sectional view of the DD position in FIG12;

[0056] FIG14 is a partial enlarged schematic diagram of position E in FIG13;

[0057] FIG15 is a schematic diagram of the cover plate of the embodiment in FIG9 ;

[0058] FIG16 is a partial enlarged schematic diagram of position F in FIG15 ;

[0059] FIG17 is a schematic diagram of the cover plate in FIG15 from another perspective;

[0060] FIG18 is a schematic diagram of a battery cell in a third embodiment of the present disclosure;

[0061] FIG19 is a partial enlarged schematic diagram of position G in FIG18 ;

[0062] FIG20 is an enlarged schematic diagram of the housing of the embodiment in FIG18 ;

[0063] FIG21 is a schematic diagram of a battery cell in a fourth embodiment of the present disclosure;

[0064] FIG22 is a schematic diagram of the embodiment in FIG19 from another perspective;

[0065] FIG23 is a partial enlarged schematic diagram of position H in FIG20;

[0066] FIG24 is an exploded view of the embodiment in FIG19 ;

[0067] FIG25 is a schematic diagram of the cover plate of the embodiment in FIG19 ;

[0068] FIG26 is a partial enlarged schematic diagram of position I in FIG25;

[0069] FIG27 is a schematic diagram of a battery cell in a fifth embodiment of the present disclosure;

[0070] FIG28 is an exploded schematic diagram of a battery cell in a sixth embodiment of the present disclosure;

[0071] FIG29 is an exploded schematic diagram of a battery cell in a seventh embodiment of the present disclosure;

[0072] FIG30 is a schematic diagram of a battery in one embodiment of the present disclosure;

[0073] FIG31 is a schematic cross-sectional view of the embodiment in FIG30 ;

[0074] FIG32 is a schematic diagram of the arrangement of seats and batteries in a vehicle according to an embodiment of the present disclosure;

[0075] FIG33 is a schematic diagram of the arrangement of a vehicle in an embodiment of the present disclosure;

[0076] FIG34 is a partially enlarged schematic diagram of position J in FIG33 . DETAILED DESCRIPTION

[0077] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of the present disclosure can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of the purpose of the present disclosure and should not be regarded as an improper limitation on the present disclosure.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification of the present disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0079] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0080] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is 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.

[0081] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0082] In the description of the embodiments of the present disclosure, for the convenience of explanation, as shown in Figures 3, 10, 14, and 24, the direction of the arrow X is the "thickness direction of the first wall portion", "the protruding direction of the first protrusion", "the covering direction of the cover plate", and the "vertical direction"; as shown in Figures 3 and 25, the direction of the arrow Y is the "first direction" and "the length direction of the first wall portion"; as shown in Figures 3 and 14, the direction of the arrow Z is the "second direction" and "the width direction of the first wall portion".

[0083] In the description of the embodiments of the present disclosure, 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; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0084] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0085] Batteries are increasingly used in everyday life and industry. They are not only used in energy storage systems like hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0086] FIG2 is a perspective exploded view of a battery 100 provided in an embodiment of the present disclosure. As shown in FIG2 , the battery 100 includes a housing 20 and at least one battery cell 10.

[0087] The box body 20 includes a top cover 21 and a bottom cover 22 . The top cover 21 covers the bottom cover 22 , so that an accommodation space for placing the battery cell 10 is formed between the bottom cover 22 and the top cover 21 .

[0088] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 may be placed in the storage space formed by the bottom cover 22 and the top cover 21. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed in the storage space formed by the bottom cover 22 and the top cover 21. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 10.

[0089] The battery cell 10 involved in the embodiments of the present disclosure includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 10 primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collector uncoated with the positive active material layer, after being stacked, serves as the positive electrode tab. Taking a lithium-ion battery as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collector uncoated with the negative active material layer, after being stacked, serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure.

[0090] The battery cell 10 may be a secondary battery. A secondary battery refers to a battery cell 10 that can be continuously used by activating active materials by charging after the battery cell 10 is discharged.

[0091] The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present disclosure.

[0092] The battery cell 10 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries, etc. There is no particular limitation in the embodiments of the present disclosure.

[0093] The battery 100 referred to in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0094] The electrical devices involved in the embodiments of the present disclosure are powered by the above-mentioned batteries, and the electrical devices may be, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. 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, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0095] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0096] FIG1 is a schematic structural diagram of a vehicle 1000 provided in an embodiment of the present disclosure. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As shown in FIG1 , a battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further 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.

[0097] In some embodiments of the present disclosure, 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 .

[0098] The following describes the embodiments of the present disclosure in detail.

[0099] A battery cell includes a shell, a pole and an electrode assembly. A space is formed inside the shell for placing the electrode assembly and storing the electrolyte. An electrochemical reaction can occur between the electrolyte and the electrode assembly. The pole passes through the shell, one end of which is electrically connected to the electrode assembly, and the other end is electrically connected to other devices outside the battery cell. In this way, the battery cell can realize the charging and discharging functions.

[0100] The electrode assembly is composed of multiple components, each with varying sizes, numbers, and shapes. This results in an irregular outer contour and the formation of protrusions. In related art, protrusions are formed on the outer surfaces of battery cells. This can increase the total volume of the battery cells, facilitating increased battery capacity. Furthermore, the shape of the space within the battery cells can be adapted to the shape of the electrode assembly, improving internal space utilization.

[0101] Influenced by the increasingly higher requirements for battery energy density, in order to enable the pole pieces in the electrode assembly to be made using a lamination process, the outer contour of the battery cell is gradually lengthened and thinned, so that the wall surface on the surface of the battery cell that can be used to form the protrusion becomes increasingly longer and narrower, making the space and size of the protrusion not conducive to the arrangement of the pole.

[0102] In view of the above problems, an embodiment of the present disclosure provides a battery cell, wherein at least one side surface of the protrusion perpendicular to its protruding direction is formed by the outer surface of a wall portion of the battery cell, thereby facilitating increasing the size of the protrusion.

[0103] Specifically, referring to FIG. 3 to FIG. 5 , an embodiment of the present disclosure provides a battery cell 10 for use in a battery 100 . The battery cell 10 includes a housing 11 and a terminal 12 .

[0104] The shell 11 includes a first wall portion 111 and a second wall portion 112. The first wall portion 111 and the second wall portion 112 are arranged adjacent to each other. The first wall portion 111 includes a first main body portion 1111 and a first protruding portion 1112. The first protruding portion 1112 protrudes from the outer surface of the first main body portion 1111 along the thickness direction of the first wall portion 111; the second wall portion 112 includes a second main body portion 1121 and a first extending portion 1122. The first extending portion 1122 is located on a side of the second main body portion 1121 close to the first wall portion 111. The first main body portion 1111 is connected to the second main body portion 1121, and the first protruding portion 1112 is connected to the first extending portion 1122 to form a protrusion 10a on the surface of the shell 11. The pole 12 is arranged on the protrusion 10a.

[0105] The outer shell 11 and the pole 12 together form the exterior surface of the battery cell 10 . A portion of the pole 12 passes through the outer shell 11 and extends into the inner space of the outer shell 11 .

[0106] The wall portion is a solid structure forming each outer contour surface of the housing 11 .

[0107] It should be noted that a wall portion can be formed by joining together multiple individual parts of the housing 11 to form a single outer contour surface; or it can be formed by only one individual part, with one surface of the individual part forming an outer contour surface of the housing 11. Furthermore, a single individual part of the housing 11 can form multiple wall portions, that is, the multiple surfaces of the individual part each form an outer contour surface of the housing 11.

[0108] The first wall portion 111 and the second wall portion 112 are disposed adjacent to each other, that is, a portion of the edge of the first wall portion 111 and a portion of the edge of the second wall portion 112 are connected to each other.

[0109] The outer surface of the first main body 1111 is a complete plane.

[0110] The thickness direction of the first wall portion 111 is the normal direction of the outer contour surface of the outer surface of the first main body portion 1111 .

[0111] The first extension portion 1122 is located at an edge of the second main portion 1121 close to the first wall portion 111 , such that the first extension portion 1122 forms a protruding portion of the second wall portion 112 .

[0112] The first body portion 1111 is connected to the second body portion 1121 , that is, a portion of the first body portion 1111 and a portion of the second body portion 1121 each form a portion where the first wall portion 111 and the second wall portion 112 are connected to each other.

[0113] The first protruding portion 1112 and the first extending portion 1122 together form a protrusion 10a on the surface of the housing 11 , that is, a portion of the surface of the protrusion 10a is the outer surface of the first protruding portion 1112 , and another portion of the surface is the outer surface of the first extension.

[0114] It is understood that at least a portion of the first protrusion 1112 forms an edge of the first wall portion 111 close to the second wall portion 112 so as to connect with the first extension portion 1122. In other words, the protrusion 10a extends all the way to the edge of the first main body portion 1111.

[0115] The terminal 12 is used to electrically connect the electrode assembly 18 inside the housing 11 and other devices outside the battery cell 10 .

[0116] The battery cell 10 in the embodiment of the present disclosure forms a protrusion 10a on the surface of the shell 11 by parts of two different wall portions. This is beneficial for increasing the size of the protrusion 10a along the thickness direction of the second wall portion 112 when the three-dimensional size of the battery cell 10 is constant, thereby facilitating an increase in the volume of the protrusion 10a, and further facilitating an increase in the capacity of the battery cell 10, and improving the space utilization within the battery cell 10. Even when the size of the battery cell 10 is small, the protrusion 10a can be arranged.

[0117] The specific position of the pole 12 on the protrusion 10a is not limited. For example, referring to Figures 3, 4 and 5, the pole 12 is provided on the end face of the protrusion 10a along its protruding direction; for another example, the pole 12 is provided on the side face of the protrusion 10a perpendicular to its protruding direction.

[0118] It is understandable that the protruding direction of the first protruding portion 1112 and the protruding direction of the first extending portion 1122 relative to the second main body portion 1121 can be in the same direction, or they can form a certain angle with each other.

[0119] It can be understood that the angle between the outer surface of the second main portion 1121 and the outer surface of the first extension portion 1122 has a direct impact on the volume of the protrusion 10a.

[0120] In some embodiments, referring to FIG. 3 and FIG. 5 , the outer surface of the second main portion 1121 is flush with the outer surface of the first extension portion 1122 , that is, the outer surfaces of the two together form a complete outer surface of the second wall portion 112 .

[0121] In this way, it is beneficial to increase the volume of the protrusion 10a while making the outer surface of the second wall portion 112 smooth, so that the battery cell 10 can be arranged in coordination with other battery cells 10 or other devices in the battery 100 through the second wall portion 112, which is beneficial to optimize the arrangement of various devices inside the battery 100 and improve the space utilization within the battery 100.

[0122] The specific number of the first protruding portion 1112 and the first extending portion 1122 is not limited, and can be one or more.

[0123] In some embodiments, referring to Figures 3 and 8 , there are multiple first protruding portions 1112 and multiple first extending portions 1122 , and the two are arranged in a one-to-one correspondence. In other words, each protrusion 10a is formed by one first protruding portion 1112 and one first extending portion 1122 .

[0124] In this way, the multiple first protrusions 1112 and the multiple first extensions 1122 are respectively adapted to form multiple protrusions 10a, so that the number of the multiple protrusions 10a is adapted to the number of protruding parts of the electrode assembly 18, thereby improving the adaptability of the protrusions 10a and helping to improve the space utilization inside the battery cell 10.

[0125] Electrode assembly 18 includes a pole piece 14 and a tab 13. Tab 13 is disposed on one side of pole piece 14, forming a protruding portion of electrode assembly 18. Pole piece 14 is used to generate an electrochemical reaction with the electrolyte in battery cell 10, while tab 13 is used to electrically connect to pole post 12, thereby conducting electrical energy between pole piece 14 and pole post 12.

[0126] The specific components of the electrode assembly 18 located within the protrusion 10 a are not limited.

[0127] In some embodiments, referring to FIG. 10 , FIG. 13 , and FIG. 14 , the battery cell 10 further includes a tab 13 , at least a portion of which is located within the protrusion 10 a .

[0128] This helps to make the shape of the space inside the shell 11 adapt to the arrangement of the protruding part of the electrode assembly 18, reduces the probability of interference between the tab 13 and the first wall portion 111 and the second wall portion 112, and improves the space utilization rate of the internal space of the battery cell 10.

[0129] In some embodiments, referring to FIG. 14 , the battery cell 10 further includes a transition piece 17 , which electrically connects the tab 13 and the post 12 . At least a portion of the transition piece 17 is located within the protrusion 10 a .

[0130] Connecting the tab 13 and the pole 12 through the adapter 17 is conducive to achieving the requirement of electrical connection between tabs 13 and poles 12 of different sizes in protrusions 10a of different sizes; at the same time, it is conducive to making the shape of the space in the shell 11 adaptable to the arrangement of the protruding part of the electrode assembly 18, reducing the probability of interference between the adapter 17 and the first wall portion 111 and the second wall portion 112, and improving the space utilization rate of the internal space of the battery cell 10.

[0131] The specific number of electrode assemblies 18 is not limited.

[0132] It can be understood that the smaller the number of electrode assemblies 18 , the smaller the size of the housing 11 .

[0133] In an embodiment in which an electrode assembly 18 is provided, referring to FIG. 10 and FIG. 24 , the electrode assembly 18 is provided in the housing 11 and electrically connected to the pole 12 . The number of the electrode assembly 18 is one or two.

[0134] The number of electrode assemblies 18 is one or two, which makes the overall outer profile of the housing 11 longer and thinner, thereby facilitating an increase in the energy density of the battery cell 10 .

[0135] In this way, the protrusion 10a is adapted to the overall outer wheel size of the smaller shell 11, so that the overall outer contour of the battery cell 10 is smaller. By arranging the protrusion 10a, the volume of the battery cell 10 is increased and the energy density of the battery cell 10 is improved.

[0136] It can be understood that the protrusion 10a can extend perpendicularly to the protrusion direction thereof to the edges of the first wall portion 111 in multiple directions to further increase the protrusion 10a of the protrusion 10a.

[0137] In some embodiments, referring to Figures 9 to 14, the housing 11 also includes a third wall portion 113, and the third wall portion 113 and the second wall portion 112 are respectively located on opposite sides of the first wall portion 111, and the third wall portion 113 includes a third main body portion 1131 and a second extension portion 1132. The first main body portion 1111 is connected to the third main body portion 1131, and the second extension portion 1132 is located on a side of the third main body portion 1131 close to the first wall portion 111, and the first protrusion 1112 is connected to the second extension portion 1132 so that the second extension portion 1132 forms a part of the protrusion 10a.

[0138] That is, the first protruding portion 1112 , the first extending portion 1122 and the second extending portion 1132 together form the protrusion 10 a . The first protruding portion 1112 extends to the edges of the first wall portion 111 on both sides.

[0139] The second extension portion 1132 is located at an edge of the third main portion 1131 close to the first wall portion 111 , such that the second extension portion 1132 forms a protruding portion of the second wall portion 112 .

[0140] The first body portion 1111 is connected to the third body portion 1131 , that is, a portion of the first body portion 1111 and a portion of the third body portion 1131 each form a portion where the first wall portion 111 and the third wall portion 113 are connected to each other.

[0141] This is beneficial for further increasing the dimension of the protrusion 10 a perpendicular to its protruding direction, thereby increasing the volume of the protrusion 10 a, thereby increasing the capacity of the battery cell 10 and improving the space utilization rate within the battery cell 10 .

[0142] The specific arrangement positions of the first extension portion 1122 and the second extension portion 1132 are not limited.

[0143] For example, referring to FIG. 11 and FIG. 14 , the first extension portion 1122 and the second extension portion 1132 are spaced apart from each other along the width direction of the first wall portion 111 .

[0144] The width direction of the first wall portion 111 refers to a linear direction in which the smaller dimension of two mutually perpendicular dimensions perpendicular to the thickness direction of the first wall portion 111 lies.

[0145] The term “oppositely arranged” means that, in a projection plane perpendicular to the width direction of the first wall portion 111 , the projection of the first extending portion 1122 and the projection of the second extending portion 1132 at least partially overlap.

[0146] This helps to make the shape of the protrusion 10 a more regular, making it easier for the battery cell 10 to match with other components in the battery 100 .

[0147] It is understandable that the shapes and sizes of the first extension portion 1122 and the second extension portion 1132 may be the same or different.

[0148] In some embodiments, referring to FIG. 12 , on a projection plane perpendicular to the width direction of the first wall portion 111 , a projection of the first extending portion 1122 completely overlaps with a projection of the second extending portion 1132 .

[0149] This helps to simplify the manufacturing process of the housing 11 and facilitates the first protrusion 1112 to be synchronously connected to the first extension portion 1122 and the second extension portion 1132 .

[0150] It can be understood that the angle between the outer surface of the second main portion 1121 and the outer surface of the first extension portion 1122 has a direct impact on the volume of the protrusion 10a.

[0151] In some embodiments, the outer surface of the third main portion 1131 is flush with the outer surface of the second extension portion 1132 . That is, the outer surfaces of the two together form a complete outer surface of the third wall portion 113 .

[0152] In this way, it is beneficial to increase the volume of the protrusion 10a while making the outer surface of the third wall portion 113 smooth, so that the battery cell 10 can be arranged in coordination with other battery cells 10 or other devices in the battery 100 through the third wall portion 113, which is beneficial to optimize the arrangement of various devices inside the battery 100 and improve the space utilization rate within the battery 100; at the same time, it is also beneficial to reduce the probability of installation interference between the part of the electrode assembly 18 located in the protrusion 10a, such as the tab 13, the adapter 17, etc., and the third wall portion 113.

[0153] In some embodiments, referring to Figures 18 to 24, the housing 11 also includes a fourth wall portion 114, the fourth wall portion 114 includes a fourth main body portion 1141 and a third extension portion 1142, the fourth main body portion 1141 is located on one side of the second main body portion 1121 and is connected, the third extension portion 1142 is located on a side of the fourth main body portion 1141 close to the first wall portion 111, and the first protrusion 1112 is connected to the third extension portion 1142 so that the third extension portion 1142 forms a part of the protrusion 10a.

[0154] That is, the first protruding portion 1112 , the first extending portion 1122 , and the third extending portion 1142 together form the protrusion 10 a .

[0155] The third extension portion 1142 is located at an edge of the fourth main portion 1141 close to the first wall portion 111 , such that the third extension portion 1142 forms a protruding portion of the fourth wall portion 114 .

[0156] The first body portion 1111 is connected to the fourth body portion 1141 , that is, a portion of the first body portion 1111 and a portion of the fourth body portion 1141 each form a portion where the first wall portion 111 and the fourth wall portion 114 are connected to each other.

[0157] This is beneficial for further increasing the dimension of the protrusion 10 a perpendicular to its protruding direction, thereby increasing the volume of the protrusion 10 a, thereby increasing the capacity of the battery cell 10 and improving the space utilization rate within the battery cell 10 .

[0158] In some embodiments, referring to FIG. 19 and FIG. 23 , the third extension portion 1142 is located on one side of the first extension portion 1122 and the two are connected.

[0159] That is, any two of the first extending portion 1122 , the first protruding portion 1112 , and the third extending portion 1142 are connected.

[0160] This is beneficial for further increasing the dimension of the protrusion 10 a perpendicular to its protruding direction, thereby increasing the volume of the protrusion 10 a, thereby increasing the capacity of the battery cell 10 and improving the space utilization rate within the battery cell 10 .

[0161] In some embodiments, referring to Figures 22 and 23, the third extension portion 1142 is connected between the first extension portion 1122 and the second extension portion 1132, so that the first protruding portion 1112, the first extension portion 1122, the second extension portion 1132, and the third extension portion 1142 collectively form a protrusion 10a. This helps further increase the dimension of the protrusion 10a perpendicular to its protruding direction, thereby increasing the volume of the protrusion 10a, thereby increasing the capacity of the battery cell 10 and improving the space utilization within the battery cell 10.

[0162] In some embodiments, referring to Figure 27, the shell 11 also includes a fifth wall portion 115, which is located on the side of the shell 11 away from the first wall portion 111. The fifth wall portion 115 includes a fifth main body portion 1151 and a second protrusion 1152. The second wall portion 112 also includes a fourth extension portion 1123. The fourth extension portion 1123 is located on a side of the second main body portion 1121 close to the fifth wall portion 115. The fifth main body portion 1151 is connected to the second main body portion 1121, and the second protrusion 1152 is connected to the first extension portion 1122 to form a protrusion 10a on the surface of the shell 11.

[0163] That is, the protrusion 10 a formed by the fifth wall portion 115 and the second wall portion 112 is located on an opposite side of the protrusion 10 a formed by the first wall portion 111 and the second wall portion 112 .

[0164] This helps expand the flexibility of the arrangement of the battery cells 10 in the battery 100 . At the same time, since the spacing between the poles 12 on the protrusions 10 a is increased, the probability of short circuits caused by accidental contact between the poles 12 is reduced.

[0165] It is understandable that the appearance parameters of the second protrusion 1152, such as shape and size, may be completely consistent with the appearance parameters of the first protrusion 1112, may be partially consistent, or may be completely different.

[0166] A plurality of battery cells 10 may be arranged in the battery 100 , and at least some of the battery cells 10 are arranged along the normal direction of their large surfaces to improve space utilization inside the battery 100 .

[0167] The protruding direction of the protrusion 10 a is adapted to the arrangement of the battery cells 10 .

[0168] 4 and 6 , in some embodiments, the outer surface of the second wall portion 112 is the largest surface of the outer surface of the housing 11. In other words, the outer surface of the second wall portion 112 forms the largest surface of the battery cell 10.

[0169] In this way, the protruding direction of the protrusion 10 a is not the same as the normal direction of the large surface, which reduces the probability of the protrusion 10 a interfering with the arrangement of the battery cells 10 and other components in the battery 100 .

[0170] It is understandable that there may be more than one pole 12 on the battery cell 10 , and the polarity of some poles 12 is positive, while the polarity of other poles 12 is negative.

[0171] In some embodiments, referring to FIG. 28 , there are two poles 12 , and the two poles 12 are located on the same protrusion 10 a .

[0172] In this way, only one protrusion 10 a needs to be manufactured to arrange two poles 12 , which is beneficial for simplifying the manufacturing steps of the housing 11 and reducing production costs.

[0173] It is understandable that the two poles 12 are spaced apart to reduce the probability of electrical connection between the two poles 12 causing a short circuit.

[0174] In some embodiments, referring to Figures 3, 6, 9 and 21, the number of poles 12 and the number of protrusions 10a are both two, and the two poles 12 are respectively located on one protrusion 10a. In other words, the two poles 12 are located on different protrusions 10a.

[0175] In this way, the probability of short circuit caused by electrical connection between the two poles 12 is reduced.

[0176] The specific position of the protrusion 10a on the first wall portion 111 is not limited.

[0177] In some embodiments, referring to FIG. 28 , the protrusion 10 a is located at the center of the first wall portion 111 along the length direction of the first wall portion 111 .

[0178] That is, the center position of the protrusion 10 a along the length direction of the first wall portion 111 and the center position of the first wall portion 111 along the length direction of the first wall portion 111 coincide with each other.

[0179] The length direction of the first wall portion 111 refers to a linear direction in which the larger dimension of two mutually perpendicular dimensions perpendicular to the thickness direction of the first wall portion 111 lies.

[0180] In this way, it is beneficial to make the outer contour of the battery cell 10 have a symmetrical structure, which is convenient for adjusting the placement direction of multiple battery cells 10 when arranged in the battery 100, so as to improve the adaptability of the battery cell 10; it is beneficial to shorten the distance between the positive electrode column 12 and the negative electrode column 12 between two adjacent battery cells 10, and facilitate electrical connection between different battery cells 10.

[0181] In some embodiments, referring to FIG. 3 and FIG. 9 , the protrusion 10 a is located at one end of the first wall portion 111 along the length direction of the first wall portion 111 .

[0182] In this way, the first main body portion 1111 is advantageously formed with a larger complete surface area, which facilitates the arrangement of other components in the battery 100 and the battery cell 10 , and is advantageous for improving the utilization rate of the space in the battery 100 .

[0183] It can be understood that the housing 11 is formed by a plurality of different parts connected to each other so as to place the electrode assembly in the housing 11 .

[0184] For example, referring to Figures 10, 24, 28 and 29, the housing 11 includes a shell 15 and a cover 16. The shell 15 defines a mounting cavity 15a, one side of which is open. The cover 16 covers the opening of the mounting cavity 15a.

[0185] After the electrode assembly 18 is placed into the installation cavity 15a through the opening of the installation cavity 15a, the cover plate 16 is fastened to the opening of the installation cavity 15a to seal the cover plate 16 and the housing 11 so that the electrode assembly 18 is stably located in the installation cavity 15a.

[0186] The corresponding relationship between the housing 15 and the cover 16 and the first wall portion 111 and the second wall portion 112 respectively is not limited.

[0187] For example, referring to FIG. 28 , the cover plate 16 and the first wall portion 111 are disposed opposite to each other.

[0188] That is, the first wall portion 111 and the second wall portion 112 are both located on the housing 15 .

[0189] In this way, the first wall portion 111 and the second wall portion 112 can be simultaneously prepared and formed during the process of preparing the shell 15 , which is beneficial to improving production efficiency and reducing production costs.

[0190] For example, referring to FIG. 29 , the cover plate 16 forms a second wall portion 112 .

[0191] That is, one side of the first protrusion 1112 is open to form a portion of the opening of the installation cavity 15a. The cover plate 16 is provided on the opening of the first protrusion 1112 to close the first protrusion 1112, thereby forming a closed protrusion 10a.

[0192] In this way, the difficulty of forming the first protrusion 1112 on the shell 15 and the difficulty of preparing the second wall portion 112 are reduced, which is conducive to reducing the production cost of the shell 11 and improving production efficiency.

[0193] For another example, referring to FIG. 10 , FIG. 14 and FIG. 24 , the cover plate 16 forms a first wall portion 111 .

[0194] It can be understood that the size of the cover plate 16 is smaller than that of the housing 15 .

[0195] In this way, the stamping direction of the first protrusion 1112 is the same as the thickness direction of the cover plate 16, which reduces the difficulty of stamping the first protrusion 1112, is conducive to reducing the size of the stamping die, reducing production costs, and improving production efficiency.

[0196] The housing 15 and cover plate 16 are sealed together using laser welding. During the laser welding process, the weld gap between the housing 15 and cover plate 16 and the deviation in the focal length of the laser welding equipment's lens affect the weld quality. Therefore, the arrangement of the housing 15 and cover plate 16 has a direct impact on the weld quality.

[0197] For example, referring to FIG. 14 , the cover plate 16 abuts against the housing 15 along its covering direction.

[0198] It can be understood that the end of the seam at the connection position between the cover 16 and the shell 15 close to the outer surface of the shell 11 is the position where laser welding needs to be performed. During the welding process, the lens of the laser welding equipment needs to move along the extension direction of the seam so that the focus of the lens is located at the end of the seam close to the outer surface of the shell 11.

[0199] That is to say, the joint between the cover plate 16 and the housing 15 does not fluctuate along the protruding direction of the first protruding portion 1112, but can extend on a plane perpendicular to the protruding direction of the first protruding portion 1112.

[0200] In this way, it is beneficial to perform welding from the side perpendicular to the protruding direction of the first protrusion 1112 during the welding process, which can reduce the adjustment of the welding equipment, especially the adjustment of the focal length of the laser welding equipment, and thus help simplify the welding process steps and improve production efficiency.

[0201] The specific manner of achieving the cooperation between the first extension portion 1122 and the first protrusion 1112 between the cover plate 16 and the housing 15 is not limited.

[0202] For example, referring to Figures 11, 15, 16 and 17, the edge of the shell 15 protrudes along the covering direction of the cover plate 16 to form a flange portion 151, the first protrusion 1112 protrudes in the direction away from the shell 15, the first protrusion 1112 opens toward one side of the shell 15 to form a second opening 16b, the first protrusion 1112 opens toward the side of the second wall portion 112 to form a third opening 16c, the second opening 16b is connected to the mounting cavity 15a, the first extension portion 1122 closes the third opening 16c, and at least a portion of the flange portion 151 forms the first extension portion 1122.

[0203] It is understandable that during the process of stamping the cover plate 16, the first portion of the first protrusion 1112 will form an end face along the stamping direction, while the other portion will be stretched and bent along the stamping direction under the action of the stamping force to form a folded edge connecting the first portion and the first main body 1111. In the case of a small size of the cover plate 16, for example, a small width dimension of the cover plate 16, the edge of the cover plate 16 is close to the folded edge, which may easily lead to problems such as difficulty in forming the folded edge and cracking of the folded edge due to stress concentration during the stamping process.

[0204] The flange portion 151 forms the third opening 16 c , that is, during the operation of punching and forming the first protrusion 1112 , the portion of the first protrusion 1112 close to the second wall portion 112 on the shell 15 does not need to be bent to generate a folded edge.

[0205] In this way, on the one hand, the risk of problems such as cracking of the first protrusion 1112 during the stamping process is reduced, the difficulty of processing and manufacturing the first protrusion 1112 is reduced, and it is beneficial to improve the yield rate of the cover plate 16 production; on the other hand, even if the size of the cover plate 16 along the opening direction of the third opening 16c is small, it is easy to form the first protrusion 1112, which is beneficial to increase the volume of the first protrusion 1112, and then it is beneficial to increase the volume of the protrusion 10a.

[0206] It can be understood that part of the housing 15 is protruded to form a flange portion 151 .

[0207] It is understandable that an escape space 16a is provided in the first protrusion 1112, and the escape space 16a is connected to the first opening 15b through the second opening 16b, and further connected to the installation cavity 15a, so that part of the electrode assembly 18 can extend into the escape space 16a.

[0208] In some embodiments where the cover plate 16 abuts against the housing 15 along the covering direction, the flange portion 151 abuts against the inner wall of the avoidance space 16 a, so that the position of the third opening 16 c forms a welding position.

[0209] It can be understood that the opening direction of the second opening 16 b is opposite to the stamping direction of the cover plate 16 .

[0210] It can be understood that a portion of the electrode assembly 18, such as the electrode tab 13, extends into the escape space 16a through the second opening 16b.

[0211] In some embodiments, the second opening 16b is connected to the third opening 16c to reduce the probability of interference between the electrode assembly 18 extending into the avoidance space 16a and the cover plate 16, while facilitating an increase in the volume within the protrusion 10a.

[0212] In some embodiments, the opening direction of the third opening 16 c is the width direction of the first wall portion 111 , so as to form a protrusion 10 a on the thin battery cell 10 .

[0213] In some embodiments, referring to FIG. 15 , FIG. 16 , FIG. 25 and FIG. 26 , the first protrusion 1112 is open on two opposite sides perpendicular to the covering direction of the cover plate 16 to form two third openings 16 c.

[0214] That is to say, there is no need to form folds on the opposite sides of the first protrusion 1112 along the covering direction perpendicular to the cover plate 16 during the stamping process. Therefore, the size of the punch in the stamping process along the relative direction of the two third openings 16c can be no less than the size of the first protrusion 1112 along this direction.

[0215] In this way, the difficulty of processing and manufacturing the first protrusion 1112 is further reduced, which is beneficial to improving the yield rate of the cover plate 16 production; it is convenient to stamp the first protrusion 1112 of the cover plate 16 of smaller size, which is further beneficial to increasing the volume of the protrusion 10a.

[0216] It is understandable that in the embodiment with the second extension portion 1132 , the flange portion 151 closing one of the third openings 16 c forms the first extension portion 1122 , and the flange portion 151 closing the other third opening 16 c forms the second extension portion 1132 .

[0217] In some embodiments, referring to Figures 25 and 26, the first protrusion 1112 is located at at least one end of the first main body 1111 along the first direction, the first protrusion 1112 is open on one side away from the first main body 1111 along the first direction to form a fourth opening 16d, and the first protrusion 1112 is open on at least one side along the second direction to form a third opening 16c. The covering direction, the first direction, and the second direction of the cover 16 are perpendicular to each other, and the flange portion 151 is located at at least one end of the shell 15 along the first direction. The flange portion 151 closes the third opening 16c and the fourth opening 16d to form a protrusion 10a together with the first protrusion 1112.

[0218] That is, the first protrusion 1112 is completely connected to the main body near the edge of the first main body 1111 in the first direction, and is at least partially connected to the flange portion 151 on the shell 15 in all other directions.

[0219] This is beneficial to further reduce the difficulty requirement of the manufacturing process of the first protrusion 1112, and at the same time, it is beneficial to further increase the volume of the avoidance space 16a when the size of the cover plate 16 is limited.

[0220] In some embodiments where the avoidance space 16a forms two third openings 16c, as shown in Figures 25 and 26, any two of the second opening 16b, the third opening 16c, and the fourth opening 16d are interconnected. The flange 151 is located at one end of the housing 15 along the first direction and is bent twice, sequentially along the first direction, the second direction, and the first direction, before being rotated and formed to form a portion of the accommodating cavity 20b. In this way, during the stamping process of the cover plate 16, only one end of the raw material needs to be stamped and bent to form the first protrusion 1112. This further reduces the probability of interference between the electrode assembly 18 extending into the avoidance space 16a and the cover plate 16, thereby further increasing the volume within the protrusion 10a.

[0221] It is understandable that, during the process of welding the cover plate 16 and the housing 15 , the steering amplitude of the welding equipment during movement directly affects the quality of welding and the efficiency of the welding operation.

[0222] In some embodiments where the cover 16 abuts the housing 15 along its installation direction, referring to FIG7 , the abutment location of the first main portion 1111 and the housing 15 forms a first seam 10b, and the abutment location of the first protrusion 1112 perpendicular to the installation direction of the cover 16 and the flange portion 151 forms a second seam 10c. The angle between the extension direction of the first seam 10b and the extension direction of the second seam 10c ranges from 95° to 145°. In other words, 95° ≤ D1 ≤ 145°.

[0223] It can be understood that the extending direction of the first seam 10b and the extending direction of the second seam 10c are both the moving directions of the welding equipment during the welding operation.

[0224] In this way, within the angle range, on the one hand, it is beneficial to increase the size of the flange portion 151 along the direction of the protrusion 10a of the first protrusion 1112 within a limited size range, which is beneficial to increase the volume of the protrusion 10a; on the other hand, it is beneficial to reduce the change in the angle of the welding equipment during the switching process between welding the first seam 10b and the second seam 10c, which is beneficial to improve the efficiency and quality of the welding work.

[0225] The specific angle value of the angle between the extending direction of the first seam 10b and the extending direction of the second seam 10c is not limited, for example, 95°, 105°, 115°, 125°, 135°, 145°, etc.

[0226] In some embodiments, a third seam 10d is formed at the abutment between one end of the flange portion 151 along the protruding direction of the first protruding portion 1112 and the first protruding portion 1112. The extending direction of the third seam 10d is parallel to the extending direction of the first seam 10b. This helps reduce changes in the direction of travel of the welding equipment during welding.

[0227] In some embodiments, referring to FIG14 , the second wall portion 112 is located on one side of the first wall portion 111 along the width direction of the first wall portion 111 , and the width of the first wall portion 111 ranges from 10 mm to 60 mm, that is, 10 mm ≤ W1 ≤ 60 mm.

[0228] In this way, on the one hand, it is beneficial to make the outer contour size of the shell 11 smaller, which is convenient for increasing the number of battery cells 10 inside the battery 100 and helping to improve the energy density of the battery 100; on the other hand, arranging the protrusion 10a within this size range is beneficial to reducing the difficulty of manufacturing the protrusion 10a.

[0229] The specific value of the width of the first wall portion 111 is not limited, for example, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc.

[0230] In some embodiments, referring to FIG. 6 and FIG. 7 , the size of the first protrusion 1112 along its protruding direction ranges from 1 mm (millimeter) to 10 mm, that is, 1 mm ≤ H1 ≤ 10 mm.

[0231] In this way, the space inside the protrusion 10a can meet the requirements for arranging the protruding portion of the electrode assembly 18, and at the same time, it can reduce the adverse effects of the size of the protrusion 10a on the arrangement of other devices in the battery 100.

[0232] The specific size of the first protrusion 1112 along its protruding direction can be 1 mm, 2 mm, 3 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0233] The method for measuring the dimension of first protrusion 1112 along its protruding direction is not limited. For example, the end surface of the base of a depth vernier caliper can be placed against the end surface of first protrusion 1112 along its protruding direction, and the caliper can be extended until the end surface of the caliper contacts the outer surface of first main body 1111. The depth vernier caliper reading can be taken to obtain the dimension of first protrusion 1112 along its protruding direction.

[0234] In some embodiments, referring to FIG. 6 and FIG. 7 , a dimension of the first extension portion 1122 along the protruding direction of the first protruding portion 1112 ranges from 1 mm to 10 mm, ie, 1 mm ≤ H2 ≤ 10 mm.

[0235] In this way, the space inside the protrusion 10a can meet the requirements for arranging the protruding portion of the electrode assembly 18, and at the same time, it can reduce the adverse effects of the size of the protrusion 10a on the arrangement of other devices in the battery 100.

[0236] A specific dimension of the first extension portion 1122 along the protruding direction of the first protruding portion 1112 may be 1 mm, 2 mm, 3 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0237] There are no restrictions on the method for measuring the dimension of the first extension portion 1122 along the protruding direction of the first protruding portion 1112. For example, the end surface of the base of a depth vernier caliper can be placed against the end surface of the first extension portion 1122 along the protruding direction of the first protruding portion 1112, and the ruler body can be extended until the end surface of the ruler body contacts the end surface of the second main body 1121 along the protruding direction of the first protruding portion 1112. The depth vernier caliper reading can be taken to obtain the dimension of the first extension portion 1122 along the protruding direction of the first protruding portion 1112.

[0238] The battery cell 10 in a specific embodiment of the present disclosure is described as follows:

[0239] The battery cell 10 includes a shell 11, a pole 12, an adapter 17 and an electrode assembly 18. The shell 11 includes a first wall portion 111, a second wall portion 112, a third wall portion 113 and a fourth wall portion 114. The first wall portion 111 is adjacent to the second wall portion 112. The first wall portion 111 includes a first main body portion 1111 and a first protruding portion 1112. The first protruding portion 1112 protrudes from the outer surface of the first main body portion 1111 along the thickness direction of the first wall portion 111; the second wall portion 112 includes a second main body portion 1121 and a first extension portion 1122. The first extension portion 1122 is located on a side of the second main body portion 1121 close to the first wall portion 111. The first main body portion 1111 is connected to the second main body portion 1121. The third wall portion 113 is adjacent to the first wall portion 114. The portion 113 and the second wall portion 112 are respectively located on one side of the opposite sides of the first wall portion 111, the third wall portion 113 includes a third main body portion 1131 and a second extension portion 1132, the first main body portion 1111 is connected to the third main body portion 1131, the second extension portion 1132 is located on a side of the third main body portion 1131 close to the first wall portion 111, the fourth wall portion 114 includes a fourth main body portion 1141 and a third extension portion 1142, the fourth main body portion 1141 is located on one side of the second main body portion 1121 and is connected, the third extension portion 1142 is located on a side of the fourth main body portion 1141 close to the first wall portion 111, the third extension portion 1142 is located on one side of the first extension portion 1122 and the two are connected, and the first protrusion 1112 is divided into the third main body portion 1131 and the second extension portion 1132. The first extension portion 1122, the second extension portion 1132, and the third extension portion 1142 are respectively connected to form a protrusion 10a on the surface of the shell 11; the shell 11 includes a shell 15 and a cover plate 16, a mounting cavity 15a is provided in the shell 15, one side of the mounting cavity 15a is opened to form a first opening 15b, the cover plate 16 is covered on the first opening 15b, the cover plate 16 forms a first wall portion 111, the cover plate 16 abuts against the shell 15 along its covering direction, a portion of the edge of the first opening 15b protrudes along the covering direction of the cover plate 16 to form a convex edge portion 151, the first protruding portion 1112 protrudes in a direction away from the first opening 15b, and an avoidance space 16a is provided in the first protruding portion 1112, and the avoidance space 16a is open toward one side of the shell 15. The first and second directions of the cover plate 16 are perpendicular to each other, and the flange portion 151 is located at least at one end of the housing 15 along the first direction.The flange portion 151 closes the third opening 16c and the fourth opening 16d to form a protrusion 10a together with the flange portion 151. Any two of the second opening 16b, the third opening 16c and the fourth opening 16d are connected to each other. At least a portion of the flange portion 151 forms a first extension portion 1122, a second extension portion 1132 and a third extension portion 1142. The abutment position of the first main body portion 1111 and the shell 15 forms a first seam 10b. The first protrusion 1112 is perpendicular to the covering direction of the cover plate 16 and forms a second seam 10c at the abutment position of the flange portion 151. The angle between the extension direction of the first seam 10b and the extension direction of the second seam 10c ranges from 95° to 145°. The second wall portion 112 is located on one side of the first wall portion 111 along the width direction of the first wall portion 111. The width dimension of the first wall portion 111 ranges from 10 mm to 60 mm. The size of the first protrusion 1112 along its protruding direction ranges from 1 mm to 10 mm, and the size of the first extension 1122 along the protruding direction of the first protrusion 1112 ranges from 1 mm to 10 mm. The number of the first protrusions 1112 and the first extension 1122 is the same, and the two are configured in a one-to-one correspondence. The electrode assembly 18 includes a pole ear 13, at least part of the pole ear 13 is located in the protrusion 10a, the adapter 17 electrically connects the pole ear 13 and the pole 12, at least part of the adapter 17 is located in the protrusion 10a, the number of electrode assemblies 18 is one or two, the outer surface of the second wall portion 112 is the surface with the largest area on the outer surface of the shell 11, the number of poles 12 is two, the number of protrusions 10a is two, the two poles 12 are respectively located on one protrusion 10a, and the protrusion 10a is located at one end of the first wall portion 111 along the length direction of the first wall portion 111.

[0240] The present disclosure also provides a battery 100. Referring to Figures 30 and 31, the battery 100 includes a case 20 and a battery cell 10 of any of the aforementioned embodiments. A accommodating space 20a is provided in the case 20. The battery cell 10 is arranged in the accommodating space 20a. An accommodating cavity 20b is provided on an inner wall of one side of the accommodating space 20a. The accommodating cavity 20b is communicated with the accommodating space 20a, and at least a portion of the protrusion 10a is accommodated in the accommodating cavity 20b.

[0241] In this way, the space inside the battery 100 can better adapt to the outer contour of the battery cell 10 , which is beneficial to improving the utilization rate of the space inside the battery 100 and improving the energy density inside the battery 100 .

[0242] In some embodiments, referring to FIG. 30 and FIG. 31 , a boss 23 is provided on the outer surface of the box body 20 . The boss 23 is located on a side of the accommodating cavity 20 b away from the accommodating space 20 a .

[0243] In this way, it is beneficial to increase the internal volume of the accommodating cavity 20 b while reducing the outer dimensions of the battery 100 , thereby increasing the energy density of the battery 100 .

[0244] An embodiment of the present disclosure further provides an electrical device, which includes the battery 100 in the aforementioned embodiment, and the battery 100 serves as a power source for the electrical device.

[0245] In this way, the protrusion 10a is formed by the first extension portion 1122 and the first protrusion 1112, which increases the volume of the protrusion 10a within a limited size of the battery cell 10, thereby facilitating an increase in space utilization of the electrical device and the capacity of the battery 100.

[0246] In some embodiments, referring to FIG. 32 and FIG. 33 , the electrical device is a vehicle, which further includes a seat 30 , and the accommodating cavity 20 b is located on a side of the box body 20 facing the seat 30 .

[0247] That is, the accommodating chamber 20b can utilize an idle space in the passenger compartment of the vehicle.

[0248] This is beneficial to increasing the volume of the battery 100 in the vehicle, thereby improving the capacity of the battery 100 and improving the vehicle's cruising range; at the same time, it is beneficial to make the flat box wall of the box body 20 face the ground side, which is beneficial to making the bottom surface of the vehicle flatter, reducing the vehicle's drag coefficient and improving the vehicle's ground clearance.

[0249] It can be understood that the seat 30 is located above the battery 100 in the vertical direction.

[0250] It is understood that in the embodiment where the battery 100 is provided with the boss 23, referring to FIG32 , the accommodating cavity 20b is located on the side of the box body 20 facing the seat 30. This is beneficial to further increase the volume of the accommodating cavity 20b, thereby increasing the capacity of the battery 100.

[0251] In some embodiments where the electrical device is a vehicle, referring to FIG. 30 , FIG. 31 and FIG. 34 , the vehicle further includes a support plate 40 .

[0252] The support plate 40 refers to a component used to enclose and form the interior cabin of the vehicle. Various components in the interior cabin of the vehicle can be arranged on the support plate 40. For example, the support plate 40 is the bottom plate of the passenger compartment, and the support plate 40 can be used to install the seat 30.

[0253] In some embodiments, referring to FIG. 33 and FIG. 34 , a surface of the support plate 40 facing the battery cell 10 is recessed to form an installation space 40 a , and at least a portion of the terminal 12 is located in the installation space 40 a .

[0254] That is, a portion of the battery cell 10 is located in the mounting space 40 a.

[0255] This is beneficial to increasing the volume of the battery 100 in the vehicle, and thus beneficial to improving the capacity of the battery 100. At the same time, the support plate 40 can play a shielding and protective role, reducing the adverse effects of problems with the battery 100 on people or devices in the space on the side of the support plate 40 away from the battery 100.

[0256] In some embodiments where the installation space 40 a is provided, referring to FIG. 33 and FIG. 34 , at least a portion of the protrusion 10 a is located in the installation space 40 a .

[0257] This is beneficial to increasing the volume of the battery 100 in the vehicle, and thus beneficial to improving the capacity of the battery 100. At the same time, the support plate 40 can play a shielding and protective role, reducing the adverse effects of problems with the battery 100 on people or devices in the space on the side of the support plate 40 away from the battery 100.

[0258] The various embodiments / implementations provided in the present disclosure can be combined with each other without causing any contradiction.

[0259] The above description is merely a preferred embodiment of the present disclosure and is not intended to limit the embodiments of the present disclosure. Those skilled in the art will appreciate that various modifications and variations of the embodiments of the present disclosure are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included within the scope of protection of the embodiments of the present disclosure. Industrial Applicability

[0260] The embodiments of the present disclosure provide a battery cell, a battery, and an electrical device that are beneficial for increasing the volume of a protrusion.

Claims

1. A battery cell, wherein: include: The housing includes a first wall portion and a second wall portion, the first wall portion being adjacent to the second wall portion, the first wall portion including a first main portion and a first protrusion, the first protrusion protruding from the outer surface of the first main portion along the thickness direction of the first wall portion; the second wall portion including a second main portion and a first extension portion, the first extension portion being located on a side of the second main portion close to the first wall portion, the first main portion being connected to the second main portion, and the first protrusion being connected to the first extension portion to form a protrusion on the housing surface; The pole is arranged on the protrusion.

2. The battery cell according to claim 1, wherein: There are multiple first protruding portions and multiple first extending portions, and the two are arranged in a one-to-one correspondence.

3. The battery cell according to claim 1, wherein: The battery cell further includes a tab, at least a portion of which is located within the protrusion.

4. The battery cell according to claim 3, wherein: The battery cell further includes a transition piece, which electrically connects the tab and the pole, and at least a portion of the transition piece is located within the protrusion.

5. The battery cell according to claim 1, wherein The battery cell further includes an electrode assembly, which is disposed in the housing and electrically connected to the electrode post. The number of the electrode assembly is one or two. The battery cell according to claim 1 , wherein: The shell also includes a third wall portion, and the third wall portion and the second wall portion are respectively located on opposite sides of the first wall portion. The third wall portion includes a third main body portion and a second extension portion. The first main body portion is connected to the third main body portion, and the second extension portion is located on a side of the third main body portion close to the first wall portion. The first protrusion is connected to the second extension portion so that the second extension portion forms a part of the protrusion.

7. The battery cell according to claim 1, wherein: The shell also includes a fourth wall portion, which includes a fourth main body portion and a third extension portion. The fourth main body portion is located on one side of the second main body portion and is connected. The third extension portion is located on a side of the fourth main body portion close to the first wall portion. The first protrusion is connected to the third extension portion so that the third extension portion forms a part of the protrusion.

8. The battery cell according to claim 7, wherein: The third extending portion is located on one side of the first extending portion and the two are connected.

9. The battery cell according to claim 1, wherein: The shell also includes a fifth wall portion, which is located on a side of the shell away from the first wall portion. The fifth wall portion includes a fifth main body portion and a second protrusion portion. The second wall portion also includes a fourth extension portion, which is located on a side of the second main body portion close to the fifth wall portion. The fifth main body portion is connected to the second main body portion, and the second protrusion portion is connected to the first extension portion to form the protrusion on the shell surface.

10. The battery cell according to claim 1, wherein The outer surface of the second wall portion is the surface with the largest area on the outer surface of the housing.

11. The battery cell according to claim 1, wherein There are two poles, and the two poles are located on the same protrusion; Alternatively, the number of the protrusions is two, and the two poles are respectively located on one protrusion.

12. The battery cell according to claim 1, wherein The protrusion is located at the center of the first wall portion along the length direction of the first wall portion; Alternatively, the protrusion is located at one end of the first wall portion along the length direction of the first wall portion.

13. The battery cell according to claim 1, wherein The housing includes a shell and a cover plate, wherein a mounting cavity is provided in the shell, one side of the mounting cavity is open, the cover plate is provided to cover the opening of the mounting cavity, and the cover plate is arranged opposite to the first wall portion; Alternatively, the cover plate forms the second wall portion.

14. The battery cell according to claim 1, wherein The housing includes a shell and a cover plate. A mounting cavity is provided in the shell. One side of the mounting cavity is opened to form a first opening. The cover plate is covered on the first opening and forms the first wall portion.

15. The battery cell according to claim 14, wherein: The cover plate abuts against the housing along a covering direction thereof.

16. The battery cell according to claim 14, wherein: The edge of the shell protrudes along the covering direction of the cover plate to form a flange portion, the first protrusion protrudes in a direction away from the shell, the first protrusion opens toward one side of the shell to form a second opening, the first protrusion opens toward the side of the second wall portion to form a third opening, the second opening is connected to the mounting cavity, the first extension portion closes the third opening, and at least part of the flange portion forms the first extension portion.

17. The battery cell according to claim 16, wherein: The first protrusion is open at two opposite sides perpendicular to the covering direction of the cover plate to form two third openings.

18. The battery cell according to claim 16, wherein: The first protrusion is located at at least one end of the first main body along the first direction, the first protrusion is opened on one side away from the first main body along the first direction to form a fourth opening, and the first protrusion is opened on at least one side along the second direction to form the third opening. The covering direction of the cover plate, the first direction and the second direction are perpendicular to each other, and the flange is located at at least one end of the shell along the first direction, and the flange closes the third opening and the fourth opening to form the protrusion together with the first protrusion.

19. The battery cell according to claim 16, wherein: The cover plate abuts against the shell along its covering direction, and the abutment position of the first main body and the shell forms a first seam. The first protrusion forms a second seam at abutment position perpendicular to the covering direction of the cover plate and the flange portion, and the angle between the extension direction of the first seam and the extension direction of the second seam ranges from 95° to 145°.

20. The battery cell according to claim 1, wherein The second wall portion is located on one side of the first wall portion along a width direction of the first wall portion, and a width dimension of the first wall portion ranges from 10 mm to 60 mm.

21. The battery cell according to claim 1, wherein The size of the first protrusion along its protruding direction ranges from 1 mm to 10 mm; And / or, a dimension of the first extension portion along the protruding direction of the first protruding portion ranges from 1 mm to 10 mm.

22. A battery, wherein: The battery includes a box body and the battery cell according to any one of claims 1-21, wherein a storage space is provided in the box body, the battery cell is arranged in the storage space, an accommodating cavity is provided on an inner wall of one side of the storage space, the accommodating cavity is communicated with the accommodating space, and at least a portion of the protrusion is accommodated in the accommodating cavity.

23. The battery according to claim 22, wherein A boss is provided on the outer surface of the box body, and the boss is located on a side of the accommodating cavity away from the accommodating space.

24. An electrical device, wherein: The electric device includes the battery according to claim 22, and the battery serves as a power source for the electric device.

25. The electrical device according to claim 24, wherein: The electrical device is a vehicle, which further includes a seat, and the accommodating cavity is located on a side of the box body facing the seat.

26. The electrical device according to claim 25, wherein: A boss is provided on the outer surface of the box body, and the boss is located on a side of the accommodating cavity away from the accommodating space.

27. The electrical device according to claim 24, wherein: The electrical device is a vehicle, and the vehicle further comprises a support plate, wherein a surface of the support plate facing the battery cell is recessed to form an installation space, and at least a portion of the terminal is located in the installation space; And / or, at least a portion of the protrusion is located in the installation space.

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