Battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, battery and electric device, the battery monomer includes shell and pole, shell includes first wall portion and second wall portion, first wall portion and second wall portion are adjacent to each other, first wall portion includes first main part and first projection portion, and second wall portion includes second main part and second projection portion. The first protruding part protrudes out of the outer surface of the first main body part in the thickness direction of the first wall part; the second wall part comprises a second main body part and a first extending part, the first extending part is located on the side, close to the first wall part, of the second main body part, the first main body part is connected with the second main body part, and the first protruding part is connected with the first extending part to form a protrusion on the surface of the shell; the pole is arranged on the protrusion. According to the battery monomer disclosed by the embodiment of the utility model, the volume of the bulges can be increased, so that the capacity of the battery monomer can be improved, the space utilization rate in the battery monomer can be improved, and the bulges can be arranged even under the condition that the size of the battery monomer is relatively small.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of batteries, and in particular 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] The battery is provided with multiple battery cells. In order to increase the number of battery cells in a limited space and thus increase the capacity of the battery, the width of the battery cells is required to be smaller and smaller so that more battery cells can be arranged along the width direction of the battery cells. At the same time, in order to improve the space utilization rate in the battery, a protrusion is provided on the outer surface of the battery to increase the volume of the battery cells.

[0004] As the size of the battery cell decreases, the area on the outer surface of the battery that can be used to arrange the protrusion becomes smaller and smaller, resulting in the size of the protrusion becoming smaller and smaller, which is not conducive to arranging other components of the battery cell inside the protrusion and is also not conducive to the manufacture of the protrusion. Utility Model Content

[0005] In view of this, the embodiments of the present invention are intended to provide a battery cell, a battery and an electrical device that can increase the size of the protrusion on the basis of a certain size of the battery cell.

[0006] To achieve the above purpose, the technical solution of the embodiment of the utility model is implemented as follows:

[0007] The present invention provides a battery cell, comprising:

[0008] The housing comprises a first wall portion and a second wall portion, wherein the first wall portion is disposed adjacent to the second wall portion, the first wall portion comprises a first main body portion and a first protruding portion, the first protruding portion protruding from the outer surface of the first main body portion along the thickness direction of the first wall portion; the second wall portion comprises a second main body portion and a first extending portion, the first extending portion is located on a side of the second main body portion close to the first wall portion, the first main body portion is connected to the second main body portion, and the first protruding portion is connected to the first extending portion to form a protrusion on the housing surface;

[0009] The pole is arranged on the protrusion.

[0010] The battery cell in the embodiment of the utility model has a protrusion on the outer shell surface formed by parts of two different wall portions, which is beneficial to 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 increasing the volume of the protrusion, and further facilitating increasing the capacity of the battery cell, and improving the space utilization rate within the battery cell. Even when the size of the battery cell is small, the protrusion can be arranged.

[0011] In some embodiments, the number of the first protrusions and the first extensions are both multiple, and the two are configured one-to-one. In this way, the multiple first protrusions and the multiple first extensions are adapted to form multiple protrusions, so that the number of the multiple protrusions is adapted to the number of protrusions of the electrode assembly, which improves the adaptability of the protrusions and is conducive to improving the space utilization inside the battery cell.

[0012] In some embodiments, the battery cell further includes a tab, at least a portion of which is located within the protrusion. This helps to adapt the shape of the space within the housing to the arrangement of the protruding portion of the electrode assembly, reduces the probability of interference between the tab and the first wall portion and the second wall portion, and improves the space utilization rate of the internal space of the battery cell.

[0013] In some embodiments, the battery cell further includes a transition piece, the transition piece electrically connects the pole lug and the pole, and at least a portion of the transition piece is located in the protrusion. This is advantageous in that the shape of the space in the housing can adapt to the arrangement of the protruding portion of the electrode assembly, reduces the probability of interference between the transition piece and the first wall portion and the second wall portion, and improves the space utilization rate of the internal space of the battery cell.

[0014] In some embodiments, the battery cell further includes an electrode assembly, which is disposed in the housing and electrically connected to the pole, and the number of the electrode assemblies is one or two. In this way, the protrusions are adapted to the overall outer wheel size of the smaller housing, so that the overall outer contour of the battery cell is smaller. By arranging the protrusions, the volume of the battery cell is increased, and the energy density of the battery cell is improved.

[0015] In some embodiments, the housing further includes a third wall portion, 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, the second extension portion is located on a side of the third main body portion close to the first wall portion, and the first protrusion portion is connected to the second extension portion so that the second extension portion forms a part of the protrusion. In this way, it is beneficial to further increase the size of the protrusion perpendicular to its protruding direction, thereby facilitating the increase of the volume of the protrusion, and further facilitating the increase of the capacity of the battery cell, and facilitating the increase of the space utilization rate within the battery cell.

[0016] In some embodiments, the housing further includes a fourth wall portion, the fourth wall portion 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 connected, the third extension portion is located on a side of the fourth main body portion close to the first wall portion, and the first protrusion portion is connected to the third extension portion so that the third extension portion forms a part of the protrusion. In this way, it is beneficial to further increase the size of the protrusion perpendicular to its protruding direction, thereby facilitating the increase of the volume of the protrusion, and further facilitating the increase of the capacity of the battery cell, and facilitating the increase of the space utilization rate within the battery cell.

[0017] In some embodiments, the third extension portion is located on one side of the first extension portion and the two are connected. This is conducive to further increasing the size of the protrusion perpendicular to its protruding direction, thereby facilitating the increase of the volume of the protrusion, thereby facilitating the increase of the capacity of the battery cell and the space utilization rate in the battery cell.

[0018] In some embodiments, the shell further includes a fifth wall portion, the fifth wall portion 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 further includes a fourth extension portion, the fourth extension portion 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. In this way, it is beneficial to expand the flexibility of the arrangement of battery cells in the battery, and at the same time, since the spacing between the poles on the protrusion is increased, the probability of short circuit caused by accidental contact between the poles is reduced.

[0019] In some embodiments, the outer surface of the second wall portion is the largest surface of the outer surface of the housing. In this way, the protruding direction of the protrusion is not in the same direction as the normal direction of the large surface, reducing the probability of the protrusion interfering with the arrangement of battery cells and other devices in the battery.

[0020] 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 the production cost.

[0021] 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 short circuit caused by electrical connection between the two poles.

[0022] In some embodiments, the protrusion is located at the center of the first wall portion along the length direction of the first wall portion, so that the outer contour of the battery cell is symmetrical, which is convenient for adjusting the placement direction of multiple battery cells when they are arranged in the battery, so as to improve the adaptability of the battery cell; it is convenient for shortening the distance between the positive electrode column and the negative electrode column between two adjacent battery cells, so as to facilitate the electrical connection between different battery cells;

[0023] Alternatively, the protrusion is located at one end of the first wall portion along the length direction of the first wall portion, which is beneficial for the first main body to form a complete surface with a larger area, facilitates the arrangement of other devices in the battery and the battery cells, and is beneficial for improving the utilization rate of the space inside the battery.

[0024] 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, the cover plate is provided to cover the opening of the mounting cavity, and the cover plate and the first wall portion are arranged opposite to each other, so that 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;

[0025] 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.

[0026] In some embodiments, the shell includes a shell and a cover plate, the shell has an installation cavity, 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 of 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.

[0027] 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, thereby simplifying the welding process steps and improving production efficiency.

[0028] In some embodiments, 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 installation cavity, the first extension portion closes the third opening, and at least part of the flange portion forms the first extension portion. In this way, on the one hand, the risk of problems such as cracking of the first protrusion during the stamping process is reduced, the difficulty of processing and manufacturing the first protrusion is reduced, and it is beneficial to improve the yield rate of cover plate production; on the other hand, even if the size of the cover plate along the opening direction of the third opening is small, it is easy to form the first protrusion, which is beneficial to increase the volume of the first protrusion, and then to increase the volume of the protrusion.

[0029] In some embodiments, the first protrusion is open on two opposite 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.

[0030] 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 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 portion is located at at least one end of the shell along the first direction, and the flange portion closes the third opening and the fourth opening to form the protrusion together with the first protrusion portion. This further helps to reduce the difficulty requirements of the manufacturing process of the first protrusion, and at the same time, helps to further increase the volume of the avoidance space when the size of the cover plate is limited.

[0031] In some embodiments, the cover plate abuts against the shell along its covering direction, and the abutting position of the first main body and the shell forms a first seam, and the abutting position of the first protrusion perpendicular to the covering direction of the cover plate and the flange portion forms a second seam, and the extending direction of the first seam and the extending direction of the second seam range from 95° to 145°. Thus, within the 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 of the welding work and the welding quality.

[0032] 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 dimension range of the first wall portion is 10 mm to 60 mm. In this way, on the one hand, it is beneficial to make the outer contour dimension of the shell smaller, which is convenient for increasing the number of battery cells inside the battery, and is beneficial for improving the energy density of the battery; on the other hand, arranging the protrusions within this size range is beneficial to reducing the difficulty of manufacturing the protrusions.

[0033] In some embodiments, the size of the first protrusion along its protruding direction ranges from 1 mm to 10 mm, which is conducive to ensuring that the space inside the protrusion meets the requirements for arranging the protruding portion 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;

[0034] And / or, the dimension 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.

[0035] An embodiment of the utility model further provides a battery, comprising 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, and 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 part 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 the energy density inside the battery.

[0036] 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 facilitating increasing the energy density of the battery.

[0037] An embodiment of the utility model also provides an electrical device, which includes the battery in the aforementioned embodiment, and the battery serves as a power source for 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 increasing the space utilization rate and battery capacity of the electrical device.

[0038] 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 increase 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, which is beneficial to make the bottom surface of the vehicle smoother, reduce the vehicle's drag coefficient and increase the vehicle's ground clearance.

[0039] In some embodiments, 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. This is beneficial for further increasing the volume of the accommodating cavity, thereby facilitating increasing the capacity of the battery.

[0040] In some embodiments, the electrical device is a vehicle, and the vehicle further comprises a support plate, a surface of one side of the support plate facing the battery cell is recessed to form an installation space, and at least a portion of the pole is located in the installation space;

[0041] And / or, at least part of the protrusion is located in the installation space. In this way, it is helpful to increase the volume of the battery in the vehicle, and then to increase the battery capacity. At the same time, the support plate can play a shielding and protective role, 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

[0042] Figure 1 A schematic diagram of a vehicle using a battery device in one embodiment of the utility model;

[0043] Figure 2 This is a schematic diagram of an explosion of a battery in one embodiment of the utility model;

[0044] Figure 3 It is a schematic diagram of a battery cell in the first embodiment of the utility model at a first viewing angle;

[0045] Figure 4 for Figure 3 A schematic diagram of the embodiment in the second viewing angle;

[0046] Figure 5 for Figure 4 A partial enlarged schematic diagram of position A in the middle;

[0047] Figure 6 for Figure 3 A schematic diagram of the embodiment in the third viewing angle;

[0048] Figure 7 for Figure 6 A partial enlarged schematic diagram of position B in the middle;

[0049] Figure 8 for Figure 3 A schematic diagram of a housing of an embodiment of the present invention;

[0050] Fig. 9 It is a schematic diagram of a battery cell in the second embodiment of the utility model at a fourth viewing angle;

[0051] Fig.10 for Fig. 9 An exploded schematic diagram of an embodiment of the invention;

[0052] Fig.11 for Fig. 9 A schematic diagram of a housing of an embodiment of the invention;

[0053] Fig.12 for Fig. 9 A schematic diagram of the embodiment in the fifth viewing angle;

[0054] Fig.13 for Fig.12 Schematic diagram of the cross section at the middle DD position;

[0055] Fig.14 for Fig.13 A partial enlarged schematic diagram of the E position in the middle;

[0056] Fig.15 for Fig. 9 A schematic diagram of a cover plate of an embodiment of the invention;

[0057] Fig.16 for Fig.15 A partial enlarged schematic diagram of the F position in the middle;

[0058] Fig.17 for Fig.15 A schematic diagram of the cover plate in another viewing angle;

[0059] Fig.18 A schematic diagram of a battery cell in the third embodiment of the present utility model;

[0060] Fig.19 for Fig.18 A partial enlarged schematic diagram of the G position in the middle;

[0061] Fig. 20 for Fig.18 An enlarged schematic diagram of the housing of the embodiment;

[0062] Fig.21 A schematic diagram of a battery cell in a fourth embodiment of the present utility model;

[0063] Fig. 22 for Fig.19 A schematic diagram of the embodiment in another viewing angle;

[0064] Fig.23 for Fig. 20A partial enlarged schematic diagram of the H position in the middle;

[0065] Fig.24 for Fig.19 An exploded schematic diagram of an embodiment of the invention;

[0066] Fig.25 for Fig.19 A schematic diagram of a cover plate of an embodiment of the invention;

[0067] Fig.26 for Fig.25 A partial enlarged schematic diagram of the middle I position;

[0068] Fig. 27 A schematic diagram of a battery cell in a fifth embodiment of the present utility model;

[0069] Fig.28 This is a schematic diagram of an explosion of a battery cell in the sixth embodiment of the present utility model;

[0070] Fig.29 This is a schematic diagram of an explosion of a battery cell in the seventh embodiment of the present utility model;

[0071] Fig.30 A schematic diagram of a battery in one embodiment of the utility model;

[0072] Fig.31 for Fig.30 A schematic cross-sectional view of an embodiment of the present invention;

[0073] Fig.32 This is a schematic diagram of the arrangement of seats and batteries in a vehicle in one embodiment of the utility model;

[0074] Fig.33 A schematic diagram of the arrangement of a vehicle in one embodiment of the utility model;

[0075] Fig.34 for Fig.33 A partial enlarged schematic diagram of the J position in the middle.

[0076] Description of Reference Numerals

[0077] 1000, vehicle; 100, battery; 200, controller; 300, motor;

[0078] 10. Battery cell; 10a. Protrusion; 10b. First seam; 10c. Second seam; 10d. Third seam; 11. Housing; 111. First wall; 1111. First main body; 1112. First protrusion; 112. Second wall; 1121. Second main body; 1122. First extension; 1123. Fourth extension; 113. Third wall; 1131. Third main body; 1132. Second extension; 114. Fourth wall ; 1141, fourth main body; 1142, third extension; 115, fifth wall; 1151, fifth main body; 1152, second protruding portion; 12, pole; 13, pole ear; 14, pole piece; 15, shell; 15a, mounting cavity; 15b, first opening; 151, flange; 16, cover; 16a, avoidance space; 16b, second opening; 16c, third opening; 16d, fourth opening; 17, adapter; 18, electrode assembly;

[0079] 20. Box body; 20a. Accommodation space; 20b. Accommodation cavity; 21. Top cover; 22. Bottom cover; 23. Boss; 30. Seat; 40. Support plate; 40a. Installation space; 41. Raised portion. DETAILED DESCRIPTION

[0080] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification of the present invention and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0082] In the description of the embodiments of the present utility model, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0083] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0084] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In the description of the embodiments of the present utility model, for the convenience of explanation, as Figure 3 , Fig.10 , Fig.14 , Fig.24 As shown, the direction of the arrow X is the “thickness direction of the first wall portion”, “the protruding direction of the first protruding portion”, “the covering direction of the cover plate”, and “the vertical direction”; Figure 3 , Fig.25 As shown, the direction of arrow Y is the "first direction" and the "length direction of the first wall portion"; Figure 3 , Fig.14 As shown, the direction indicated by the arrow Z is referred to as the “second direction” and the “width direction of the first wall portion”.

[0086] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0087] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0088] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0089] Figure 2 The following is a schematic diagram of a three-dimensional exploded view of a battery 100 provided in an embodiment of the present utility model. Figure 2 As shown, the battery 100 includes a housing 20 and at least one battery cell 10.

[0090] The box body 20 includes a top cover 21 and a bottom cover 22 . The top cover 21 is covered on 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 .

[0091] In the battery 100, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is placed in the accommodation space formed by the bottom cover 22 and the top cover 21; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation 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 realizing electrical connection between the multiple battery cells 10.

[0092] The battery cell 10 involved in the embodiment of the utility model includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure.

[0093] 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.

[0094] 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the utility model.

[0095] 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 batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no particular limitation in the embodiments of the present invention.

[0096] The battery 100 involved in the embodiment of the present invention refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0097] The electric device involved in the embodiment of the utility model is provided with electric energy by the above-mentioned battery, and the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0098] In the following embodiments, for the convenience of description, the electric device of one embodiment of the utility model is taken as a vehicle 1000 as an example for description.

[0099] Figure 1 The structure diagram of a vehicle 1000 provided in one embodiment of the utility model is shown in FIG. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0100] In some embodiments of the present invention, the battery 100 can be used 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.

[0101] Below, the embodiments of the present utility model are described in detail.

[0102] The 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 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.

[0103] The electrode assembly is composed of multiple components, and the size, quantity and shape of each component are different, so the outer contour of the electrode assembly is irregular, and a protrusion is formed on the electrode assembly. In the related art, a protrusion is formed on the outer surface of the battery cell. By setting the protrusion, the total volume of the battery cell can be increased, which is conducive to improving the capacity of the battery cell; at the same time, it is conducive to the shape of the space inside the battery cell to adapt to the shape of the electrode assembly, thereby improving the space utilization rate inside the battery cell.

[0104] Affected by the increasingly higher requirements for battery energy density, in order to make the pole pieces in the electrode assembly adopt 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 longer and narrower, making the space and size of the protrusion not conducive to the arrangement of the pole.

[0105] Based on the above problems, an embodiment of the utility model 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 the enlargement of the size of the protrusion.

[0106] Specifically, see Figures 3 to 5 An embodiment of the utility model provides a battery cell 10 used in a battery 100 . The battery cell 10 includes a housing 11 and a pole 12 .

[0107] The shell 11 includes a first wall portion 111 and a second wall portion 112. 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 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.

[0108] The outer shell 11 and the pole 12 together form the appearance surface of the battery cell 10 , and a portion of the pole 12 passes through the outer shell 11 and extends into the inner space of the outer shell 11 .

[0109] The wall portion is a solid structure that forms each outer contour surface of the housing 11 .

[0110] It should be noted that a wall portion may be formed by splicing a plurality of single parts in the housing 11 to form an outer contour surface together; or may be formed by only a single part, and a surface of the single part forms an outer contour surface of the housing 11. In addition, a single part in the housing 11 may form a plurality of wall portions, that is, a plurality of surfaces of the single part each form an outer contour surface of the housing 11.

[0111] The first wall portion 111 and the second wall portion 112 are disposed adjacent to each other, that is, a partial edge of the first wall portion 111 and a partial edge of the second wall portion 112 are connected to each other.

[0112] The outer surface of the first main body 1111 is a complete plane.

[0113] 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 body portion 1111 .

[0114] The first extension portion 1122 is located at an edge of the second main body portion 1121 close to the first wall portion 111 , so that the first extension portion 1122 forms a protruding portion of the second wall portion 112 .

[0115] 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.

[0116] 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.

[0117] It is understandable that at least part of the first protruding portion 1112 forms an edge of the first wall portion 111 close to the second wall portion 112 so as to be connected to the first extending portion 1122. In other words, the protrusion 10a extends all the way to the edge of the first main body portion 1111.

[0118] The pole 12 is used to electrically connect the electrode assembly 18 inside the housing 11 and other devices outside the battery cell 10 .

[0119] The battery cell 10 in the embodiment of the utility model has a protrusion 10a on the surface of the outer shell 11 formed 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 increasing the volume of the protrusion 10a, and further facilitating increasing the capacity of the battery cell 10, and improving the space utilization rate within the battery cell 10. Even when the size of the battery cell 10 is small, the protrusion 10a can be arranged.

[0120] The specific position of the pole 12 on the protrusion 10a is not limited, for example, see Figure 3 , Figure 4 and Figure 5 For example, the pole 12 is arranged on the end face of the protrusion 10a along the protruding direction thereof; for another example, the pole 12 is arranged on the side face of the protrusion 10a perpendicular to the protruding direction thereof.

[0121] It can be understood 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.

[0122] It can be understood that the angle between the outer surface of the second main body portion 1121 and the outer surface of the first extension portion 1122 has a direct impact on the volume of the protrusion 10a.

[0123] In some embodiments, see Figure 3 and Figure 5 The outer surface of the second main body 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 .

[0124] 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 with 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 rate inside the battery 100.

[0125] The specific number of the first protruding portion 1112 and the first extending portion 1122 is not limited, and can be one or more.

[0126] In some embodiments, see Figure 3 and Figure 8 The number of the first protruding portions 1112 and the first extending portions 1122 are both multiple, and the two are arranged in a one-to-one correspondence. In other words, each protrusion 10a is formed by a first protruding portion 1112 and a first extending portion 1122.

[0127] 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 consistent with the number of protruding parts of the electrode assembly 18, thereby improving the adaptability of the protrusions 10a and facilitating improving the space utilization inside the battery cell 10.

[0128] The electrode assembly 18 includes a pole piece 14 and a pole ear 13. The pole ear 13 is disposed on one side of the pole piece 14, so that the pole ear 13 forms a protruding portion of the electrode assembly 18. The pole piece 14 is used to generate an electrochemical reaction with the electrolyte in the battery cell 10, and the pole ear 13 is used to electrically connect the pole 12 to realize the conduction of electric energy between the pole piece 14 and the pole 12.

[0129] The specific components of the electrode assembly 18 located within the protrusion 10a are not limited.

[0130] In some embodiments, see Fig.10 , Fig.13 and Fig.14 The battery cell 10 further includes a pole ear 13 , at least a portion of which is located in the protrusion 10 a .

[0131] This helps to make the shape of the space inside the shell 11 adapt to the arrangement of the protruding portion of the electrode assembly 18, reduce the probability of interference between the tab 13 and the first wall portion 111 and the second wall portion 112, and improve the space utilization rate of the internal space of the battery cell 10.

[0132] In some embodiments, see Fig.14 The battery cell 10 further includes a transition piece 17 , which electrically connects the pole lug 13 and the pole 12 , and at least a portion of the transition piece 17 is located in the protrusion 10 a .

[0133] Connecting the pole lug 13 and the pole post 12 via the adapter 17 is beneficial to achieving the requirement of electrical connection between the pole lugs 13 and the pole posts 12 of different sizes in protrusions 10a of different sizes; at the same time, it is beneficial to make the shape of the space in the outer shell 11 adapt 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, thereby improving the space utilization rate of the internal space of the battery cell 10.

[0134] The specific number of electrode assemblies 18 is not limited.

[0135] It can be understood that the smaller the number of electrode assemblies 18 is, the smaller the size of the housing 11 is.

[0136] In the embodiment with electrode assembly 18, see Fig.10 and Fig.24 The electrode assembly 18 is disposed in the housing 11 and is electrically connected to the pole 12 . The number of the electrode assembly 18 is one or two.

[0137] The number of the electrode assembly 18 is one or two, which makes the overall outer contour of the housing 11 longer and thinner, thereby facilitating the improvement of the energy density of the battery cell 10 .

[0138] In this way, the protrusion 10a is adapted to the overall outer wheel size of the smaller housing 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.

[0139] 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.

[0140] In some embodiments, see Figures 9 to 14The 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.

[0141] 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 two opposite sides.

[0142] The second extension portion 1132 is located at an edge of the third main body portion 1131 close to the first wall portion 111 , so that the second extension portion 1132 forms a protruding portion of the second wall portion 112 .

[0143] 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.

[0144] This helps to further increase the size of the protrusion 10 a perpendicular to its protruding direction, thereby helping to increase the volume of the protrusion 10 a, and further helps to increase the capacity of the battery cell 10 and improve the space utilization rate within the battery cell 10 .

[0145] The specific arrangement positions of the first extension portion 1122 and the second extension portion 1132 are not limited.

[0146] For example, see Fig.11 and Fig.14 The first extension portion 1122 and the second extension portion 1132 are arranged relatively spaced apart along the width direction of the first wall portion 111 .

[0147] 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.

[0148] Relative arrangement means that in a projection plane perpendicular to the width direction of the first wall portion 111 , the projection of the first extension portion 1122 and the projection of the second extension portion 1132 at least partially overlap.

[0149] 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 .

[0150] 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.

[0151] In some embodiments, see Fig.12 In the projection plane perpendicular to the width direction of the first wall portion 111 , the projection of the first extension portion 1122 completely overlaps with the projection of the second extension portion 1132 .

[0152] This helps to simplify the manufacturing process of the housing 11 and facilitates the first protrusion 1112 to synchronously connect the first extension portion 1122 and the second extension portion 1132 .

[0153] It can be understood that the angle between the outer surface of the second main body portion 1121 and the outer surface of the first extension portion 1122 has a direct impact on the volume of the protrusion 10a.

[0154] In some embodiments, the outer surface of the third main body 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 .

[0155] 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 with 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 in 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.

[0156] In some embodiments, see 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 one 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.

[0157] That is, the first protruding portion 1112 , the first extending portion 1122 , and the third extending portion 1142 together form the protrusion 10 a .

[0158] The third extending portion 1142 is located at an edge of the fourth main body portion 1141 close to the first wall portion 111 , so that the third extending portion 1142 forms a protruding portion of the fourth wall portion 114 .

[0159] 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.

[0160] This helps to further increase the size of the protrusion 10 a perpendicular to its protruding direction, thereby helping to increase the volume of the protrusion 10 a, and further helps to increase the capacity of the battery cell 10 and improve the space utilization rate within the battery cell 10 .

[0161] In some embodiments, see 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.

[0162] That is to say, any two of the first extending portion 1122 , the first protruding portion 1112 , and the third extending portion 1142 are connected.

[0163] This helps to further increase the size of the protrusion 10 a perpendicular to its protruding direction, thereby helping to increase the volume of the protrusion 10 a, and further helps to increase the capacity of the battery cell 10 and improve the space utilization rate within the battery cell 10 .

[0164] In some embodiments, see Fig. 22 and Fig.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 together form a protrusion 10a. In this way, it is beneficial to further increase the size of the protrusion 10a perpendicular to its protruding direction, thereby facilitating the increase of the volume of the protrusion 10a, and further facilitating the increase of the capacity of the battery cell 10, and facilitating the improvement of the space utilization rate in the battery cell 10.

[0165] In some embodiments, see Fig. 27 The shell 11 also includes a fifth wall portion 115, which is located on a 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 protruding portion 1152. The second wall portion 112 also includes a fourth extension portion 1123, which 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 protruding portion 1152 is connected to the first extension portion 1122 to form a protrusion 10a on the surface of the shell 11.

[0166] 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 .

[0167] This is beneficial for expanding 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.

[0168] It is understandable that the appearance parameters such as shape and size of the second protrusion 1152 may be completely consistent with the appearance parameters of the first protrusion 1112 , may be partially consistent with them, or may be completely different.

[0169] 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 the space utilization inside the battery 100 .

[0170] The protruding direction of the protrusion 10 a is adapted to the arrangement of the battery cells 10 .

[0171] In some embodiments, see Figure 4 and Figure 6 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 .

[0172] In this way, the protruding direction of the protrusion 10 a is not in the same direction 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 devices in the battery 100 .

[0173] It is understandable that the number of poles 12 on the battery cell 10 may be multiple, and the polarity of some poles 12 is positive, and the polarity of other poles 12 is negative.

[0174] In some embodiments, see Fig.28 , the number of the poles 12 is two, and the two poles 12 are located on the same protrusion 10a.

[0175] In this way, only one protrusion 10a needs to be manufactured to arrange two poles 12, which is beneficial to simplify the manufacturing steps of the housing 11 and reduce the production cost.

[0176] 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.

[0177] In some embodiments, see Figure 3 , Figure 6 , Fig. 9 and Fig.21 The number of the poles 12 and the number of the 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.

[0178] In this way, the probability of short circuit caused by electrical connection between the two poles 12 can be reduced.

[0179] The specific position of the protrusion 10a on the first wall portion 111 is not limited.

[0180] In some embodiments, see 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 .

[0181] 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.

[0182] The length direction of the first wall portion 111 refers to a straight line direction in which the larger dimension of two mutually perpendicular dimensions perpendicular to the thickness direction of the first wall portion 111 is located.

[0183] 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 when multiple battery cells 10 are arranged in the battery 100, so as to improve the adaptability of the battery cells 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 the electrical connection between different battery cells 10.

[0184] In some embodiments, see Figure 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 .

[0185] In this way, the first main body 1111 can form a complete surface with a larger area, which is convenient for the arrangement of other components in the battery 100 and the battery cell 10 , and is conducive to improving the utilization rate of the space in the battery 100 .

[0186] 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 .

[0187] For example, see Fig.10 , Fig.24 , Fig.28 and Fig.29 The housing 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 open. The cover plate 16 is covered at the open portion of the mounting cavity 15a.

[0188] 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 buckled onto 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.

[0189] The corresponding relationship between the shell 15 and the cover plate 16 and the first wall portion 111 and the second wall portion 112 respectively is not limited.

[0190] For example, see Fig.28 The cover plate 16 and the first wall portion 111 are arranged opposite to each other.

[0191] That is, both the first wall portion 111 and the second wall portion 112 are located on the housing 15 .

[0192] In this way, it is convenient to simultaneously prepare and form the first wall portion 111 and the second wall portion 112 during the process of preparing the shell 15, which is beneficial to improving production efficiency and reducing production costs.

[0193] For example, see Fig.29 , the cover plate 16 forms the second wall portion 112 .

[0194] That is, one side of the first protruding portion 1112 is opened to form a part of the opening of the installation cavity 15a. The cover plate 16 is disposed on the opening of the first protruding portion 1112 to close the first protruding portion 1112, thereby forming a closed protrusion 10a.

[0195] In this way, it is helpful to reduce the difficulty of forming the first protrusion 1112 on the shell 15 and the difficulty of preparing the second wall portion 112, which is helpful to reduce the production cost of the shell 11 and improve the production efficiency.

[0196] For example, see Fig.10 , Fig.14 and Fig.24 , the cover plate 16 forms a first wall portion 111 .

[0197] It can be understood that the size of the cover plate 16 is smaller than that of the housing 15 .

[0198] 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 beneficial to reducing the size of the stamping die, reducing production costs, and improving production efficiency.

[0199] The shell 15 and the cover plate 16 are sealed by laser welding. During the laser welding process, the deviation between the welding gap between the shell 15 and the cover plate 16 and the focal length of the lens of the laser welding equipment affects the welding quality. Therefore, the arrangement between the shell 15 and the cover plate 16 has a direct impact on the welding quality between the two.

[0200] For example, see Fig.14 The cover plate 16 abuts against the housing 15 along its covering direction.

[0201] 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 outer shell 11 is the position where laser welding needs to be performed. The lens of the laser welding equipment needs to move along the extension direction of the seam during the welding process so that the focus of the lens is located at the end of the seam close to the outer surface of the outer shell 11.

[0202] That is to say, the joint between the cover plate 16 and the housing 15 will 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.

[0203] 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.

[0204] 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.

[0205] For example, see Fig.11 , Fig.15 , Fig.16 and Fig.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 installation cavity 15a, the first extension portion 1122 closes the third opening 16c, and at least part of the flange portion 151 forms the first extension portion 1122.

[0206] It is understandable that, in the process of stamping the cover plate 16, the first part of the first protrusion 1112 will form an end face along the stamping direction, and the other part will be stretched and bent along the stamping direction under the action of the stamping force to form a folded edge connecting the first part and the first main body 1111. In the case where the size of the cover plate 16 is small, for example, the size of the cover plate 16 in the width direction is small, 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.

[0207] The flange portion 151 forms the third opening 16c, that is, in 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.

[0208] In this way, on the one hand, the risk of 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.

[0209] It can be understood that part of the shell 15 is convenient to protrude to form the flange portion 151.

[0210] It is understandable that a relief space 16a is provided in the first protrusion 1112, and the relief 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 relief space 16a.

[0211] 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.

[0212] 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 .

[0213] 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.

[0214] 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 increasing the volume within the protrusion 10a.

[0215] 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 .

[0216] In some embodiments, see 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 16c.

[0217] That is to say, the first protrusion 1112 does not need to form folded edges on both sides 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 may not be smaller than the size of the first protrusion 1112 along this direction.

[0218] 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 increase the volume of the protrusion 10a.

[0219] 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 .

[0220] In some embodiments, see Fig.25 and Fig.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 opened 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 opened 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 plate 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, and 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.

[0221] That is, the first protrusion 1112 is completely connected to the main body at an edge close to 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.

[0222] 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.

[0223] In some embodiments where the avoidance space 16a forms two third openings 16c, see Fig.25 and Fig.26 Any two of the second opening 16b, the third opening 16c and the fourth opening 16d are connected to each other, and the flange portion 151 is located at one end of the shell 15 along the first direction, and is bent twice in the first direction, the second direction and the first direction in sequence, and is rotated to form a part of the accommodating cavity 20b. In this way, in the process of stamping and manufacturing the cover plate 16, only one end of the raw material needs to be stamped and bent to form the first protruding portion 1112; the probability of interference between the electrode assembly 18 extending into the avoidance space 16a and the cover plate 16 is further reduced, which is conducive to further increasing the volume in the protrusion 10a.

[0224] It can be understood that, during the process of welding the cover plate 16 and the shell 15 , the steering amplitude of the welding equipment during movement directly affects the quality of welding and the efficiency of the welding operation.

[0225] In some embodiments, the cover plate 16 abuts against the housing 15 along its covering direction, see Figure 7 The first main body 1111 and the housing 15 form a first joint 10b at their abutting positions, the first protruding portion 1112 is perpendicular to the direction of the cover plate 16 and the flange 151 at their abutting positions to form a second joint 10c, and the angle between the extending direction of the first joint 10b and the extending direction of the second joint 10c is in the range of 95° to 145°. In other words, 95°≤D1≤145°.

[0226] 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.

[0227] 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 of the welding work and the welding quality.

[0228] The specific angle value of the angle between the extension direction of the first seam 10b and the extension direction of the second seam 10c is not limited, for example, 95°, 105°, 115°, 125°, 135°, 145°, etc.

[0229] In some embodiments, the third seam 10d is formed by the contact position between one end of the flange portion 151 along the protruding direction of the first protruding portion 1112 and the first protruding portion 1112, and the extension direction of the third seam 10d is parallel to the extension direction of the first seam 10b. This helps to reduce the change in the traveling direction of the welding equipment during the welding process.

[0230] In some embodiments, see Fig.14 The second wall portion 112 is located at one side of the first wall portion 111 along the width direction of the first wall portion 111, and the width dimension of the first wall portion 111 ranges from 10 mm to 60 mm. That is, 10 mm ≤ W1 ≤ 60 mm.

[0231] In this way, on the one hand, it is helpful 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 helpful to reduce the difficulty of manufacturing the protrusion 10a.

[0232] The specific value of the width dimension of the first wall portion 111 is not limited, for example, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc.

[0233] In some embodiments, see Figure 6 and Figure 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.

[0234] In this way, it is helpful to make the space inside the protrusion 10a meet the requirements for arranging the protruding portion of the electrode assembly 18, and at the same time, it is helpful to reduce the adverse effect of the size of the protrusion 10a on the arrangement of other devices in the battery 100.

[0235] The specific size of the first protrusion 1112 along its protruding direction may be 1 mm, 2 mm, 3 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0236] There is no limit to the method for measuring the size of the first protruding portion 1112 along its protruding direction. For example, the end face of the base of the depth vernier caliper is placed against the end face of the first protruding portion 1112 along its protruding direction, and the ruler is extended until the end face of the ruler is in contact with the outer surface of the first main body 1111, and the reading of the depth vernier caliper is read to obtain the size of the first protruding portion 1112 along its protruding direction.

[0237] In some embodiments, see Figure 6 and Figure 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, that is, 1 mm ≤ H2 ≤ 10 mm.

[0238] In this way, it is helpful to make the space inside the protrusion 10a meet the requirements for arranging the protruding portion of the electrode assembly 18, and at the same time, it is helpful to reduce the adverse effect of the size of the protrusion 10a on the arrangement of other devices in the battery 100.

[0239] 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.

[0240] There is no limit to 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 face of the base of the depth vernier caliper is placed against the end face of the first extension portion 1122 along the protruding direction of the first protruding portion 1112, and the ruler is extended until the end face of the ruler is in contact with the end face of the second main body 1121 along the protruding direction of the first protruding portion 1112, and the reading of the depth vernier caliper is read to obtain the dimension of the first extension portion 1122 along the protruding direction of the first protruding portion 1112.

[0241] The battery cell 10 in a specific embodiment of the present invention is described as follows:

[0242] 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 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. The third wall portion 113 is adjacent to the first wall portion 114. The third wall 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 one 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 protruding portion 1112 is divided into The outer shell 11 comprises a shell 15 and a cover plate 16, wherein the shell 15 is provided with a mounting cavity 15a, 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 part 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 second opening 16b is opened and at least one side perpendicular to the covering direction of the cover plate 16 is opened to form a third opening 16c. The second opening 16b is communicated with the installation cavity 15a. The two opposite sides of the avoidance space 16a perpendicular to the covering direction of the cover plate 16 are opened to form two third openings 16c. The first protrusion 1112 is located at at least one end of the first main body 1111 along the first direction. The side of the avoidance space 16a away from the first main body 1111 along the first direction is opened to form a fourth opening 16d. The avoidance space 16a is opened along at least one side of the second direction to form a third opening 16c. The covering direction, the first direction and the second direction of the cover plate 16 are perpendicular to each other. The flange portion 151 is located at at least one end of the shell body 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 part of the flange portion 151 forms a first extension portion 1122, a second extension portion 1132 and a third extension portion 1142, the first main body portion 1111 and the shell body 15 abutting position to form a first seam 10b, the first protruding portion 1112 is perpendicular to the covering direction of the cover plate 16 and forms a second seam 10c at the abutting position of the flange portion 151, the extending direction of the first seam 10b and the extending direction of the second seam 10c are in the range of 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, and 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 1mm to 10mm, the size of the first extension 1122 along the protruding direction of the first protrusion 1112 ranges from 1mm to 10mm, the number of the first protrusion 1112 and the first extension 1122 is the same, and the two are configured one by one, 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 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 111 along the length direction of the first wall 111.

[0243] The utility model also provides a battery 100, see Fig.30 and Fig.31 The battery 100 includes a box body 20 and a battery cell 10 of any of the aforementioned embodiments. A storage space 20a is provided in the box body 20. The battery cell 10 is arranged in the storage 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. At least a portion of the protrusion 10a is accommodated in the accommodating cavity 20b.

[0244] 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 .

[0245] In some embodiments, see Fig.30 and Fig.31 A boss 23 is provided on the outer surface of the box body 20, and the boss 23 is located on the side of the accommodating cavity 20b away from the accommodating space 20a.

[0246] In this way, it is beneficial to increase the internal volume of the accommodating cavity 20 b while reducing the outer contour size of the battery 100 , thereby facilitating increasing the energy density of the battery 100 .

[0247] The embodiment of the utility model further provides an electric device, which includes the battery 100 in the above embodiment, and the battery 100 serves as a power source of the electric device.

[0248] In this way, the protrusion 10 a is formed by the first extension portion 1122 and the first protruding portion 1112 , which increases the volume of the protrusion 10 a within a limited size of the battery cell 10 , thereby facilitating increasing the space utilization of the electrical device and the capacity of the battery 100 .

[0249] In some embodiments, see Fig.32 and Fig.33 The electrical device is a vehicle, which also includes a seat 30 , and the accommodating cavity 20 b is located on a side of the box body 20 facing the seat 30 .

[0250] That is, the accommodation chamber 20b can utilize an idle space in the passenger compartment of the vehicle.

[0251] This is beneficial to increasing the volume of the battery 100 in the vehicle, thereby helping to increase 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, which is beneficial to making the bottom surface of the vehicle smoother, reducing the vehicle's drag coefficient and improving the vehicle's ground clearance.

[0252] It can be understood that the seat 30 is located above the battery 100 in the vertical direction.

[0253] It is understood that in the embodiment where the battery 100 is provided with the boss 23, see Fig.32 The accommodating chamber 20b is located on the side of the box body 20 facing the seat 30. In this way, the volume of the accommodating chamber 20b is further increased, thereby increasing the capacity of the battery 100.

[0254] In some embodiments where the electrical device is a vehicle, see Fig.30 , Fig.31 and Fig.34 , the vehicle further includes a support plate 40 .

[0255] The support plate 40 refers to a component used to enclose and form an 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.

[0256] In some embodiments, see Fig.33 and Fig.34The 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 pole 12 is located in the installation space 40 a .

[0257] That is, a portion of the battery cell 10 is located in the mounting space 40 a .

[0258] This is beneficial to increasing the volume of the battery 100 in the vehicle, and further 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.

[0259] In some embodiments with installation space 40a, see Fig.33 and Fig.34 , at least a portion of the protrusion 10a is located in the installation space 40a.

[0260] This is beneficial to increasing the volume of the battery 100 in the vehicle, and further 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.

[0261] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0262] The above description is only a preferred embodiment of the present invention and is not intended to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall portion and a second wall portion, wherein the first wall portion is disposed adjacent to the second wall portion, the first wall portion comprises a first main body portion and a first protruding portion, the first protruding portion protruding from the outer surface of the first main body portion along the thickness direction of the first wall portion; the second wall portion comprises a second main body portion and a first extending portion, the first extending portion is located on a side of the second main body portion close to the first wall portion, the first main body portion is connected to the second main body portion, and the first protruding portion is connected to the first extending portion to form a protrusion on the housing surface; The pole is arranged on the protrusion.

2. The battery cell according to claim 1, characterized in that: The number of the first protruding portions and the number of the first extending portions are both plural, and the two are arranged in a one-to-one correspondence.

3. The battery cell according to claim 1, characterized in that: 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, characterized in that: The battery cell further includes a transition piece, which electrically connects the pole lug and the pole, and at least a portion of the transition piece is located in the protrusion.

5. The battery cell according to claim 1, characterized in that: The battery cell further includes an electrode assembly, which is disposed in the housing and electrically connected to the pole. The number of the electrode assembly is one or two.

6. The battery cell according to claim 1, characterized in that: 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, the second extension portion is located on a side of the third main body portion close to the first wall portion, and 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, characterized in that: 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 to the second main body portion. 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, characterized in that: The third extending portion is located at 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, the fourth extension portion 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, characterized in that: 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, characterized in that: The number of the poles is two, 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 of the protrusions.

12. The battery cell according to claim 1, characterized in that: 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, characterized in that: The housing comprises a shell and a cover plate, a mounting cavity is provided in the shell, one side of the mounting cavity is open, the cover plate is arranged to cover the open portion of the mounting cavity, and the cover plate and the first wall portion are arranged opposite to each other; Alternatively, the cover plate forms the second wall portion.

14. The battery cell according to claim 1, characterized in that: The housing comprises a shell and a cover plate. A mounting cavity is arranged in the shell. One side of the mounting cavity is opened to form a first opening. The cover plate is arranged to cover the first opening and forms the first wall portion.

15. The battery cell according to claim 14, characterized in that: The cover plate abuts against the shell along its covering direction.

16. The battery cell according to claim 14, characterized in that: The edge of the shell protrudes along the covering direction of the cover plate to form a flange portion, the first protrusion protrudes in the 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 installation 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 abutment position of the first protrusion perpendicular to the covering direction of the cover plate and the flange portion forms a second seam. 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, characterized in that: The second wall portion is located at 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, characterized in that: 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, characterized in that: The battery comprises a box body and the battery cell of 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, a storage cavity is provided on an inner wall of one side of the storage space, the storage cavity is communicated with the storage space, and at least a part of the protrusion is accommodated in the storage cavity.

23. The battery according to claim 22, characterized in that 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, characterized in that: The electrical device comprises the battery according to claim 22, and the battery serves as a power source for the electrical device.

25. The electrical device according to claim 24, characterized in that: The electrical device is a vehicle, which also 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, characterized in that: 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, characterized in that: The electrical device is a vehicle, and the vehicle further comprises a support plate, a surface of one side of the support plate facing the battery cell is recessed to form an installation space, and at least a portion of the pole 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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