Battery cell, battery pack and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell, a battery pack and an electric device. The battery cell comprises a shell and a pole group; the shell is provided with a first shell wall and a second shell wall which are located on the two opposite sides, one of the first shell wall and the second shell wall is provided with a positive terminal, the other one is provided with a negative terminal, and the positive terminal and the negative terminal are of structures suitable for mutual insertion matching of the first battery cell and the second battery cell; the first battery cell of which the second shell wall is provided with the negative terminal is suitable for being reversely inserted and connected in series with the second battery cell of which the second shell wall is provided with the positive terminal; and the second battery cell with the negative terminal arranged on the first shell wall is suitable for being reversely inserted and connected in series with the first battery cell with the positive terminal arranged on the other first shell wall. According to the battery cell provided by the utility model, the battery cell can be arranged into two structures which can be plugged and matched with each other, and the adjacent battery cells are connected without welding, so that when one battery cell breaks down, the battery cell is convenient to disassemble, maintain and replace, and the production cost and the after-sales cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell, a battery pack and an electrical device. Background Art

[0002] Lithium-ion batteries, with their advantages of high rate performance, high safety, large capacity, long cycle life, and environmental friendliness, are widely used in various fields, including 3C digital products, electric vehicles, and energy storage power stations. With the challenges posed by global climate change and energy issues, electricity demand in emerging industries is increasing, and energy storage is gradually penetrating more scenarios. Long-duration energy storage is also attracting widespread attention.

[0003] The current battery cell assembly system mainly connects the positive and negative poles of the battery cells by welding, and is limited by factors such as the pole shape and the thickness of the shell, which has certain requirements for welding technology. When a battery in the battery pack fails, it cannot be replaced and maintained, and the after-sales cost is high. Utility Model Content

[0004] In view of this, the present invention provides a battery cell, a battery pack and an electrical device to solve the problems of high welding requirements for the positive and negative electrodes of the battery cell and high maintenance costs.

[0005] In the first aspect, the utility model provides a battery cell, comprising a shell and a pole group; the shell comprises a main body and a protrusion protruding from one end of the main body to one side, the inner cavity of the main body and the inner cavity of the protrusion are connected to form a accommodating cavity, the shape of the pole group is adapted to the shape of the shell, and is arranged in the accommodating cavity; the shell has a first shell wall and a second shell wall located on opposite sides, the first shell wall is a plane, and the second shell wall is a stepped surface extending from the main body to the protrusion; one of the first shell wall and the second shell wall is provided with a positive terminal, and the other is provided with a negative terminal, the positive terminal and the negative terminal are structures suitable for mutual plug-in and cooperation between the first battery cell and the second battery cell; a first battery cell with a negative terminal provided on the second shell wall is suitable for reverse inversion plug-in and series connection with a second battery cell with a positive terminal provided on the second shell wall; a second battery cell with a negative terminal provided on the first shell wall is suitable for reverse inversion plug-in and series connection with a first battery cell with a positive terminal provided on the other first shell wall.

[0006] Beneficial effects: The battery cells provided by the utility model can be set as two structures that can be plugged into and paired with each other. Adjacent battery cells do not require welding connections. When a battery cell fails, it is easy to disassemble, maintain and replace, saving production costs and after-sales costs.

[0007] In an optional embodiment, one of the positive terminal and the negative terminal is configured as a protrusion and the other as a groove, and the protrusion and the groove are adapted to be plugged into and fitted with each other.

[0008] In an optional embodiment, the protrusion is arranged perpendicular to the main body, and the first battery cell and the second battery cell are adapted to be inverted and plugged in with the second shell walls facing each other to form a rectangular parallelepiped structure.

[0009] In an optional embodiment, the second shell wall includes a first side wall provided on the main body, a second side wall connected to the first side wall, and a third side wall provided on the raised portion and connected to the second side wall, and the positive terminal or the negative terminal is provided on any one of the first side wall, the second side wall and the third side wall.

[0010] In an optional embodiment, the battery cell is a first battery cell, and the positive terminal and the negative terminal of the first battery cell are respectively arranged on two opposite side walls of the raised portion; or, the battery cell is a second battery cell, and the positive terminal and the negative terminal of the second battery cell are respectively arranged on two opposite side walls of the main body.

[0011] In an optional embodiment, pole ears with opposite polarities are provided on both sides of the pole group; the outer shell includes a shell body, a first cover plate assembly and a second cover plate assembly; the first cover plate assembly includes a first cover plate, a first current collecting sheet and a first insulating sheet, the first cover plate is provided with a groove, the first current collecting sheet and the first insulating sheet are both provided with a first pole ear through-hole, and the pole ears on the corresponding sides of the pole group pass through the first insulating sheet and the first pole ear through-hole of the first current collecting sheet in sequence and are then welded to the first current collecting sheet; the second cover plate assembly includes a second cover plate, a second current collecting sheet and a second insulating sheet, the second insulating sheet and the second current collecting sheet are both provided with a second pole ear through-hole, and the pole ears on the corresponding sides of the pole group pass through the second insulating sheet and the second pole ear through-hole of the second current collecting sheet in sequence and are then welded to the second current collecting sheet; the second cover plate is provided with a pole post through-hole, and the second current collecting sheet is provided with a protrusion, which passes through the pole post through-hole; in the first battery cell, the first cover plate assembly constitutes the third side wall, and the second cover plate assembly constitutes the first shell wall; or, in the second battery cell, the first cover plate assembly constitutes the first shell wall, and the second cover plate assembly constitutes the first side wall.

[0012] In an optional embodiment, the shell has multiple side walls perpendicular to each other, and the battery cell further includes an explosion-proof valve, which is arranged on any side wall perpendicular to the side wall where the positive terminal and the negative terminal are located.

[0013] In the second aspect, the utility model also provides a battery pack, comprising at least two battery modules, the battery module comprising multiple battery cells of any one of the above technical solutions, the battery cells comprising a first battery cell and a second battery cell, adjacent first battery cells and second battery cells are arranged in an inverted manner with respect to each other, and are connected in series through positive terminals and negative terminals; at the same end of adjacent battery modules, one is a positive terminal and the other is a negative terminal, and the two are conductively connected in series through a bus.

[0014] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells and will not be described in detail here.

[0015] In an optional embodiment, it further includes a heat insulating sheet and / or a fixing frame, wherein the heat insulating sheet is arranged between two adjacent battery cells; and the fixing frame is arranged outside the battery module to fix multiple battery cells connected in series.

[0016] In a third aspect, the present invention further provides an electrical device comprising a battery pack according to any one of the above technical solutions.

[0017] Beneficial effects: Since the electrical device includes a battery pack, it has the same effects as the battery pack and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a battery module composed of battery cells according to an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the assembly of the first battery cell and the second battery cell;

[0021] Figure 3 for Figure 2 A schematic structural diagram of the first battery cell in the figure at a first viewing angle;

[0022] Figure 4 for Figure 2 A schematic structural diagram of the first battery cell in the figure at a second viewing angle;

[0023] Figure 5 for Figure 2 Schematic diagram of the exploded structure of the electrode group in the first battery cell;

[0024] Figure 6 for Figure 2 Schematic diagram of the structural decomposition of the first battery cell;

[0025] Figure 7 for Figure 2 A schematic structural diagram of the second battery cell in the figure at a first viewing angle;

[0026] Figure 8 for Figure 2 A schematic structural diagram of the second battery cell in the middle at a second viewing angle;

[0027] Figure 9 for Figure 2 Schematic diagram of the exploded structure of the electrode group in the second battery cell;

[0028] Figure 10 for Figure 2 Schematic diagram of the structural decomposition of the second battery cell;

[0029] Figure 11 for Figure 1 Schematic diagram of the exploded structure of the battery module and the fixing frame shown.

[0030] Description of reference numerals:

[0031] 1. Shell; 11. Main body; 12. Raised portion; 101. First shell wall; 102. Second shell wall; 1021. First side wall; 1022. Second side wall; 1023. Third side wall; 2. Electrode group; 21. Positive electrode sheet; 211. Positive electrode tab; 22. Separator; 23. Negative electrode sheet; 231. Negative electrode tab; 3. Positive terminal; 4. Negative terminal; 110. Shell body; 120. First cover plate group Components; 130, second cover plate assembly; 1201, first cover plate; 1202, first current collecting sheet; 1203, first insulating sheet; 1204, first pole ear through-hole; 1301, second cover plate; 1302, second current collecting sheet; 1303, second insulating sheet; 1304, second pole ear through-hole; 1305, pole through-hole; 10, first battery cell; 20, second battery cell; 30, fixing frame; 40, busbar. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] The following combination Figures 1 to 11 , describing the embodiments of the present utility model.

[0034] According to an embodiment of the present utility model, in a first aspect, a battery cell is provided, comprising a housing 1 and an electrode group 2; the housing 1 comprises a main body 11 and a protrusion 12 protruding from one end of the main body 11 to one side, the inner cavity of the main body 11 and the inner cavity of the protrusion 12 are connected to form an accommodating cavity, the shape of the electrode group 2 is adapted to the shape of the housing 1, and is arranged in the accommodating cavity; the housing 1 has a first housing wall 101 and a second housing wall 102 located on opposite sides, the first housing wall 101 is a plane, and the second housing wall 102 is a stepped surface extending from the main body 11 to the protrusion 12, as shown in FIG. Figure 3As shown; in the first shell wall 101 and the second shell wall 102, one of them is provided with a positive terminal 3, and the other is provided with a negative terminal 4, and the positive terminal 3 and the negative terminal 4 are structures suitable for the first battery cell and the second battery cell to be plugged and matched with each other; a first battery cell 10 with a negative terminal 4 provided on one second shell wall 102 is suitable for being plugged and connected in series with a second battery cell 20 with a positive terminal 3 provided on the second shell wall 102 in reverse order; the second battery cell 20 with a negative terminal 4 provided on the first shell wall 101 is suitable for being plugged and connected in series with a first battery cell 10 with a positive terminal 3 provided on another first shell wall 101 in reverse order.

[0035] Specifically, if Figure 1 and Figure 2 As shown, when adjacent battery cells are connected in series, the positions of the two battery cells are inverted relative to each other. In this embodiment, the second shell wall 102 of the first battery cell 10 is provided with a negative terminal 4, and the first shell wall 101 of the first battery cell 10 is provided with a positive terminal 3. Accordingly, the second shell wall 102 of the second battery cell 20 is provided with a positive terminal 3, and the first shell wall 101 of the second battery cell 20 is provided with a negative terminal 4. In this way, the second shell wall 102 of a first battery cell 10 is invertedly connected to the second shell wall 102 of a second battery cell 20, and the negative terminal 4 of the first battery cell 10 is connected to the positive terminal 3 of the second battery cell 20; the first shell wall 101 of the second battery cell 20 is invertedly connected to the first shell wall 101 of another first battery cell 10, and the negative terminal 4 of the second battery cell 20 is connected to the positive terminal 3 of the first battery cell 10, thereby forming a series structure of first battery cell 10, second battery cell 20, first battery cell 10, second battery cell 20, and so on.

[0036] The battery cells (i.e., secondary battery cells) provided in the embodiments of the present invention can be configured as two mutually pluggable and paired structures, eliminating the need for welding connections between adjacent cells. This facilitates disassembly, maintenance, and replacement when a cell fails, saving production and after-sales costs. For example, when a first cell 10 fails, only the corresponding first cell 10 needs to be replaced.

[0037] In some embodiments, one of the positive terminal 3 and the negative terminal 4 is configured as a protrusion and the other as a groove, and the protrusion and the groove are adapted to be plugged into and fitted with each other.

[0038] Specifically, the shell 1 is provided with grooves and protrusions, and the positive terminal 3 of the battery cell is connected to the negative terminal 4 of the next adjacent battery cell by plugging and unplugging. The battery pack thus formed eliminates the traditional welding process, and one of the battery cells can be flexibly replaced, reducing after-sales maintenance costs.

[0039] In this embodiment, the conductive terminal welded to the housing 1 is configured as a groove, and the conductive terminal of the other polarity is configured as a protrusion. Furthermore, in this embodiment, the negative terminal 4 is configured as a groove, and the positive terminal 3 is configured as a protrusion.

[0040] The plug-in method of convex columns and grooves is adopted, which has a simple structure, is easy to manufacture, and is convenient for disassembly, assembly and maintenance.

[0041] In some embodiments, the protrusion 12 is arranged perpendicular to the body 11 , and the first battery cell 10 and the second battery cell 20 are adapted to be inverted and plugged into each other with the second shell wall 102 facing each other to form a rectangular parallelepiped structure.

[0042] like Figure 1 and Figure 2 As shown, the first battery cell 10 is an L-shaped structure, and the second battery cell 20 is inverted and docked with the first battery cell 10 to form a rectangular parallelepiped structure.

[0043] In some embodiments, the second shell wall 102 includes a first side wall 1021 provided on the main body portion 11, a second side wall 1022 connected to the first side wall 1021, and a third side wall 1023 provided on the raised portion 12 and connected to the second side wall 1022, and the positive terminal 3 or the negative terminal 4 is provided on any one of the first side wall 1021, the second side wall 1022 and the third side wall 1023.

[0044] like Figure 3 As shown, the first side wall 1021, the second side wall 1022, and the third side wall 1023 are sequentially connected to form a stepped surface, namely the second shell wall 102. In this embodiment, the negative terminal 4 of the first battery cell 10 is located on the third side wall 1023, and correspondingly, the positive terminal 3 of the second battery cell 20 is located on the first side wall 1021. In this way, when the second battery cell 20 and the first battery cell 10 are arranged in an inverted manner, the negative terminal 4 of the first battery cell 10 is exactly opposite the positive terminal 3 of the second battery cell 20, so that the first battery cell 10 and the second battery cell 20 can be connected in series by plugging the positive terminal 3 and the negative terminal 4.

[0045] In other embodiments, when the negative terminal 4 of the first battery cell 10 is provided on the second side wall 1022, the positive terminal 3 of the second battery cell 20 to be plugged in and paired therewith is also provided on the second side wall 1022, and the first battery cell 10 and the second battery cell 20 are plugged in and out along the axial direction of the boss to achieve assembly or disassembly.

[0046] In some embodiments, the battery cell is a first battery cell 10, and the positive terminal 3 and the negative terminal 4 of the first battery cell 10 are respectively arranged on two opposite side walls of the raised portion 12; or, the battery cell is a second battery cell 20, and the positive terminal 3 and the negative terminal 4 of the second battery cell 20 are respectively arranged on two opposite side walls of the main body 11.

[0047] In this embodiment, referring to Figure 2The positive terminal 3 and the negative terminal 4 of the first battery cell 10 are provided at the raised portion 12, and the positive terminal 3 and the negative terminal 4 of the second battery cell 20 are provided at the main body portion 11. Therefore, the first battery cell 10 and the second battery cell 20 can be plugged in and out of reverse.

[0048] In some embodiments, pole lugs with opposite polarities are provided on both sides of the pole group 2; the housing 1 includes a housing body 110, a first cover assembly 120 and a second cover assembly 130; Figure 6 or Figure 10 As shown, the first cover plate assembly 120 includes a first cover plate 1201, a first current collecting sheet 1202 and a first insulating sheet 1203. The first cover plate 1201 is provided with a groove, and the first current collecting sheet 1202 and the first insulating sheet 1203 are both provided with a first pole ear through-hole 1204. The pole ears on the corresponding sides of the pole group 2 pass through the first insulating sheet 1203 and the first pole ear through-hole 1204 of the first current collecting sheet 1202 in sequence and are welded to the first current collecting sheet 1202. The first current collecting sheet 1202 is welded to the first cover plate 1201; as shown Figure 6 or Figure 10 As shown, the second cover plate assembly 130 includes a second cover plate 1301, a second current collecting sheet 1302 and a second insulating sheet 1303. The second current collecting sheet 1302 and the second insulating sheet 1303 are both provided with a second pole ear through-hole 1304. The pole ears on the corresponding side of the pole group 2 pass through the second insulating sheet 1303 and the second pole ear through-hole 1304 of the second current collecting sheet 1302 in sequence and are then welded to the second current collecting sheet 1302. The second current collecting sheet 1302 and the second cover plate 1 301 is welded; the second cover plate 1301 is provided with a pole through-hole 1305, and the second current collecting sheet 1302 is provided with a boss, which passes through the pole through-hole 1305; in the first battery cell 10, the first cover plate assembly 120 constitutes the third side wall 1023, and the second cover plate assembly 130 constitutes the first shell wall 101; or, in the second battery cell 20, the first cover plate assembly 120 constitutes the first shell wall 101, and the second cover plate assembly 130 constitutes the first side wall 1021.

[0049] Specifically, in Figure 5 or Figure 9 In the illustrated embodiment, the electrode assembly 2 includes a positive electrode sheet 21, a separator 22, and a negative electrode sheet 23. Because the shape of the housing cavity of the housing 1 differs from conventional irregular shapes, and the shape of the electrode assembly 2 matches the shape of the cavity, the positive electrode sheet 21, separator 22, and negative electrode sheet 23 are L-shaped to match the shape of the cavity. A positive electrode tab 211 extends from the positive electrode sheet 21, and a negative electrode tab 231 extends from the negative electrode sheet 23. The positive electrode sheet 21, separator 22, and negative electrode sheet 23 are stacked in sequence through a lamination process. The tabs are welded to the corresponding current collectors according to their position.

[0050] In this embodiment, for the first battery cell 10, the negative electrode tab 231 passes through the first insulating sheet 1203 and the first current collector 1202 before being welded to the first current collector 1202. The first current collector 1202 is welded to the first cover 1201, and the first cover 1201 is welded to the shell body 110. Therefore, the shell body 110 is negatively charged. The corresponding position of the first cover 1201 is provided with a groove, forming the negative terminal 4 of the first battery cell 10. The positive electrode tab 211 passes through the second insulating sheet 1303 and the second current collector 1302, is folded over, and is welded to the second current collector 1302. A protrusion is provided on the second current collector 1302, which passes through the pole hole 1305 of the second cover 1301 to form the positive terminal 3.

[0051] The second battery cell 20 differs from the first battery cell 10 in that the first cover plate assembly 120 forms the first shell wall 101 and the second cover plate assembly 130 forms the first side wall 1021. The second battery cell 20 is assembled in the same manner as the first battery cell 10.

[0052] In this way, the first battery cell 10 and the second battery cell 20 can be paired in reverse, the concave negative terminal 4 of the first battery cell 10 and the convex positive terminal 3 of the second battery cell 20 are plugged in, and the concave negative terminal 4 of the second battery cell 20 and the convex positive terminal 3 of another first battery cell 10 are plugged in, and so on. They are connected in series in sequence to form a battery module, and multiple battery modules constitute a battery pack.

[0053] In the battery cell of this embodiment, the negative electrode tab 231 of the electrode group 2 is welded to the first current collector 1202, which is then welded to the first cover 1201 in the outer shell 1, giving the outer shell 1 a negative charge. A positive terminal 3 is also provided. Alternatively, the positive electrode tab 211 of the electrode group 2 in the battery cell is welded to the second current collector 1302, which is then welded to the second cover 1301 in the outer shell 1, giving the outer shell 1 a positive charge. A negative terminal 4 is also provided. This facilitates the design of the negative terminal 4 as a groove and the positive terminal 3 as a protrusion.

[0054] In some embodiments, the housing 1 has a plurality of mutually perpendicular side walls, and the battery cell further includes an explosion-proof valve, which is provided on any side wall perpendicular to the side wall where the positive terminal 3 and the negative terminal 4 are located. Figure 2 From the perspective shown, the explosion-proof valve can be located on any one or more of the top, bottom, front or back of the battery cell.

[0055] With this arrangement, the explosion-proof valve and the positive terminal 3 or the negative terminal 4 are respectively arranged on different side walls to achieve thermal and electrical separation, which can avoid thermal runaway contacting the electrical structure and further aggravating the thermal runaway range, thereby improving the safety performance of the battery pack.

[0056] According to an embodiment of the present invention, in a second aspect, a battery pack is further provided, comprising at least two battery modules, the battery module comprising a plurality of battery cells according to any one of the above embodiments, the battery cells comprising a first battery cell 10 and a second battery cell 20, adjacent first battery cells 10 and second battery cells 20 are arranged in an inverted manner relative to each other, and are connected in series through a positive terminal 3 and a negative terminal 4; at the same end of adjacent battery modules, one is a positive terminal 3 and the other is a negative terminal 4, and the two are conductively connected in series through a bus 40.

[0057] When the number of battery cells is large, the side ends of multiple battery modules are conductively connected in series through a bus bar 40 , and an insulating layer is provided on the outside of the bus bar 40 .

[0058] The battery pack provided by the embodiment of the present invention is designed to obtain two types of battery cells with simple structures, different tab positions, and which can be paired with each other in reverse. The two are integrated by plugging, eliminating the traditional welding process, making installation and disassembly convenient, and the cost of structural parts low. One of the battery cells can be flexibly replaced, reducing after-sales maintenance costs.

[0059] In some embodiments, a heat insulating sheet and / or a fixing frame 30 is further included. The heat insulating sheet is provided between two adjacent battery cells. The fixing frame 30 is provided outside the battery module to fix a plurality of battery cells connected in series.

[0060] In this embodiment, a heat insulating sheet is provided at the joint surface between adjacent first battery cells 10 and second battery cells 20 , that is, between adjacent second shell walls 102 . This can provide heat insulation and prevent heat from spreading when thermal runaway occurs in one battery cell.

[0061] In some embodiments, a fixing frame 30 is provided outside the battery module to maintain the connection between the battery cells. One fixing frame 30 may be provided for one battery module, or one fixing frame 30 may be provided for two or more battery modules.

[0062] Specifically, the fixing frame 30 includes a steel belt.

[0063] In some embodiments, a cold plate is added between the inner bottom surface of the battery pack and the battery cell, and the protrusions and grooves of the battery cell are all arranged on the side walls with a smaller area. By adding cooling channels on the large surface and bottom surface of the battery cell, the heat dissipation efficiency of the battery pack can be improved.

[0064] According to an embodiment of the present invention, in a third aspect, an electrical device is further provided, comprising a battery pack according to any one of the above technical solutions.

[0065] Since the electrical device includes a battery pack and has the same effect as the battery pack, it will not be described in detail here.

[0066] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: It comprises a housing (1) and a pole group (2); The housing (1) comprises a main body (11) and a protruding portion (12) protruding from one end of the main body (11) to one side. The inner cavity of the main body (11) and the inner cavity of the protruding portion (12) are connected to form a receiving cavity. The shape of the electrode group (2) is adapted to the shape of the housing (1) and is arranged in the receiving cavity. The housing (1) comprises a first housing wall (101) and a second housing wall (102) located on opposite sides, wherein the first housing wall (101) is a plane, and the second housing wall (102) is a stepped surface extending from the main body (11) to the raised portion (12); a positive terminal (3) is provided on one of the first housing wall (101) and the second housing wall (102), and a negative terminal (4) is provided on the other of the first housing wall (101) and the second housing wall (102); the positive terminal (3) and the negative terminal (4) are structures suitable for mutual plugging and matching of the first battery cell and the second battery cell; A first battery cell (10) having a negative terminal (4) provided on the second shell wall (102) is adapted to be connected in series with a second battery cell (20) having a positive terminal (3) provided on the second shell wall (102) in an inverted manner; The second battery cell (20) having a negative terminal (4) provided on the first shell wall (101) is suitable for reverse plug-in connection in series with another first battery cell (10) having a positive terminal (3) provided on the first shell wall (101).

2. The battery cell according to claim 1, characterized in that The positive terminal (3) and the negative terminal (4) are configured as a convex column and a groove respectively, and the convex column and the groove are suitable for mutual insertion and matching.

3. The battery cell according to claim 2, characterized in that The raised portion (12) is arranged perpendicular to the main body (11), and the first battery core (10) and the second battery core (20) are adapted to be inverted and plugged in with the second shell wall (102) facing each other to form a rectangular parallelepiped structure.

4. The battery cell according to claim 2 or 3, characterized in that: The second shell wall (102) includes a first side wall (1021) provided on the main body (11), a second side wall (1022) connected to the first side wall (1021), and a third side wall (1023) provided on the raised portion (12) and connected to the second side wall (1022); the positive terminal (3) or the negative terminal (4) is provided on any one of the first side wall (1021), the second side wall (1022), and the third side wall (1023).

5. The battery cell according to claim 4, characterized in that: The battery cell is a first battery cell (10), and the positive terminal (3) and the negative terminal (4) of the first battery cell (10) are respectively arranged on two opposite side walls of the raised portion (12); Alternatively, the battery cell is a second battery cell (20), and the positive terminal (3) and the negative terminal (4) of the second battery cell (20) are respectively arranged on two opposite side walls of the main body (11).

6. The battery cell according to claim 4, characterized in that Both sides of the electrode group (2) are provided with electrode ears with opposite polarities; The housing (1) comprises a housing body (110), a first cover assembly (120) and a second cover assembly (130); The first cover plate assembly (120) comprises a first cover plate (1201), a first current collecting sheet (1202) and a first insulating sheet (1203); the first cover plate (1201) is provided with the groove; the first current collecting sheet (1202) and the first insulating sheet (1203) are both provided with a first pole ear through-hole (1204); the pole ears on the corresponding side of the pole group (2) pass through the first insulating sheet (1203) and the first pole ear through-hole (1204) of the first current collecting sheet (1202) in sequence and are then welded to the first current collecting sheet (1202); The second cover plate assembly (130) comprises a second cover plate (1301), a second current collecting sheet (1302) and a second insulating sheet (1303); the second current collecting sheet (1302) and the second insulating sheet (1303) are both provided with a second pole ear through-hole (1304); the pole ears on the corresponding side of the pole group (2) pass through the second insulating sheet (1303) and the second pole ear through-hole (1304) of the second current collecting sheet (1302) in sequence and are then welded to the second current collecting sheet (1302); the second cover plate (1301) is provided with a pole through-hole (1305); the second current collecting sheet (1302) is provided with a protruding column, and the protruding column passes through the pole through-hole (1305); In the first battery cell (10), the first cover plate assembly (120) constitutes the third side wall (1023), and the second cover plate assembly (130) constitutes the first shell wall (101); Alternatively, in the second battery cell (20), the first cover plate assembly (120) constitutes the first shell wall (101), and the second cover plate assembly (130) constitutes the first side wall (1021).

7. The battery cell according to any one of claims 1 to 3, characterized in that: The housing (1) has a plurality of mutually perpendicular side walls, and the battery core further comprises an explosion-proof valve, which is arranged on any side wall perpendicular to the side wall where the positive terminal (3) and the negative terminal (4) are located.

8. A battery pack, characterized in that: comprising at least two battery modules, each of which comprises a plurality of battery cells according to any one of claims 1 to 7, The battery cell comprises a first battery cell (10) and a second battery cell (20), wherein adjacent first battery cells (10) and second battery cells (20) are arranged in an inverted manner relative to each other and are connected in series via a positive terminal (3) and a negative terminal (4); At the same end of the adjacent battery modules, one is a positive terminal (3) and the other is a negative terminal (4), and the two are electrically connected in series via a busbar (40).

9. The battery pack according to claim 8, characterized in that: Also includes: A heat insulating sheet is provided between two adjacent battery cells; and / or, A fixing frame (30) is provided outside the battery module and fixes a plurality of battery cells connected in series.

10. An electrical device, characterized in that: Including the battery pack according to claim 8 or 9.

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