Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery cell includes: a first post; the battery cell assembly is provided with a first side face, a second side face and a third side face, the first side face faces the first pole, the third side face is opposite to the first side face, the second side face is located between the first side face and the third side face, and the first side face and the third side face are each provided with a first tab; the first adapter piece comprises a first section, a second section and a third section which are connected in sequence, the second section is located on the side, provided with the second side face, of the battery cell assembly, the first section is bent to the side, provided with the first side face, of the battery cell assembly relative to the second section and is electrically connected with the first tab on the first side face, and the first section is electrically connected with the first pole column; the third section is bent relative to the second section to one side, provided with the third side surface, of the battery cell assembly, and is electrically connected with the first tab on the third side surface.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0002] With the rapid development of the electric vehicle market, higher demands are being placed on battery energy density, fast charging speed, and safety performance. Charging time is crucial for improving user satisfaction and convenience, especially in commercial sectors such as taxis, where shorter charging times can significantly improve vehicle operating efficiency and economic benefits. However, existing square aluminum-cased batteries have poor fast-charging performance and cannot meet the demands of fast charging. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell, battery, and power device that can improve fast charging performance and better meet the needs of fast charging, in order to address the above problems.

[0004] On one hand, this application provides a single battery cell, comprising:

[0005] First pole;

[0006] A battery cell assembly has a first side, a second side, and a third side. The first side faces a first terminal post, the third side faces the first side, and the second side is located between the first side and the third side. Both the first side and the third side have first tabs.

[0007] The first adapter piece includes a first segment, a second segment, and a third segment connected in sequence. The second segment is located on the side of the battery cell assembly with the second side. The first segment is bent relative to the second segment to the side of the battery cell assembly with the first side and is electrically connected to the first tab on the first side. The first segment is also electrically connected to the first terminal post. The third segment is bent relative to the second segment to the side of the battery cell assembly with the third side and is electrically connected to the first tab on the third side.

[0008] In some embodiments, the first segment has a first through hole, and the first tab on the first side extends through the first through hole to the side of the first segment opposite to the cell assembly and is soldered to the surface of the first segment opposite to the cell assembly.

[0009] In some embodiments, the first electrode post and the first electrode tab are located on the portion of the first segment opposite to the cell assembly and / or the first segment is welded and fixed.

[0010] In some embodiments, the third segment has a second through hole, and the first tab on the third side extends through the second through hole to the side of the third segment opposite to the cell assembly, and is welded to the surface of the third segment opposite to the cell assembly.

[0011] In some embodiments, the first side of the battery cell assembly has a plurality of first tabs, and the first segment is electrically connected to each of the first tabs on the first side; and / or

[0012] The third side of the battery cell assembly has a plurality of first tabs, and the third segment is electrically connected to each of the first tabs on the third side.

[0013] In some embodiments, the battery cell further includes a second terminal and a second adapter piece, the second terminal and the first terminal are located on the same side of the cell assembly, the first side and the third side each have a second tab with a polarity opposite to the first tab, and the second adapter piece includes a fourth segment, a fifth segment and a sixth segment connected in sequence.

[0014] The battery cell assembly also has a fourth side opposite to the second side, the fifth segment is located on the side of the battery cell assembly with the fourth side, the fourth segment is bent relative to the fifth segment to the side of the battery cell assembly with the first side and electrically connected to the second tab on the first side, the fourth segment is electrically connected to the second pole; the sixth segment is bent relative to the fifth segment to the side of the battery cell assembly with the third side and electrically connected to the second tab on the third side.

[0015] In some embodiments, the fourth segment has a third through hole, through which the second electrode tab on the first side extends to the side of the fourth segment opposite to the cell assembly and is welded to the surface of the fourth segment opposite to the cell assembly.

[0016] The second electrode post and the second electrode tab are located on the side of the fourth segment opposite to the cell assembly and / or the fourth segment is welded and fixed.

[0017] In some embodiments, the sixth segment has a fourth through hole, through which the second electrode tab on the third side extends to the side of the sixth segment opposite to the cell assembly, and is soldered to the surface of the sixth segment opposite to the cell assembly.

[0018] On the other hand, this application provides a battery including a battery cell as described in any of the preceding claims.

[0019] In another aspect, this application provides an electrical device including a battery as described in any of the above embodiments.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] The aforementioned battery cell, battery, and electrical device all have first tabs of the same polarity on both the first side and the third side opposite to the first side of the cell assembly, and are electrically connected to the first terminal post via a first adapter piece. In other words, the increased number of first tabs, and the presence of first tabs on different sides of the cell assembly (i.e., the first and third sides), results in a more uniform current density across the cell assembly during charging, which is beneficial for improving the battery's fast-charging performance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of this application (the outer casing is omitted);

[0023] Figure 2 for Figure 1 The diagram shows the assembly structure of the battery cell assembly, the first adapter piece, and the second adapter piece of the battery cell.

[0024] Figure 3 for Figure 1 The diagram shows the assembly structure of the battery cell assembly, the first adapter piece, and the second adapter piece from another perspective.

[0025] Figure 4 for Figure 1 A schematic diagram of the structure of the first adapter piece of the battery cell shown;

[0026] Figure 5 for Figure 1 The diagram shows the structure of the second adapter piece of the battery cell. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] One embodiment of this application provides an electrical device that uses a battery or battery cell as its power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0034] A battery comprises a casing and individual battery cells, which are housed within the casing. The casing provides space for the battery cells and can have various structures and shapes, such as a cuboid. A battery may contain multiple individual cells, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections refers to multiple battery cells being connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then housed within the casing. Alternatively, multiple battery cells can be first connected in series, parallel, or a combination thereof to form a battery module, and then these modules can be connected in series, parallel, or a combination thereof to form a single unit housed within the casing. The battery may also include other structures, such as a busbar for electrical connection between the multiple battery cells. Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these.

[0035] The specific structure of the battery cell is described in detail below with reference to the accompanying drawings. Please refer to the attached diagram. Figures 1 to 4In the embodiments of this application, the battery cell includes a casing, a first terminal post 20, a cell assembly 30, and a first adapter plate 40. The casing has a receiving cavity in which the cell assembly 30 is received. The first terminal post 20 is disposed on the casing, and the cell assembly 30 has a first side a1, a second side a2, and a third side a3. The first side a1 faces the first terminal post 20, the third side a3 is opposite to the first side a1, and the second side a2 is located between the first side a1 and the third side a3. Both the first side a1 and the third side a3 of the cell assembly 30 have first tabs 31. It is understood that the polarity of each first tab 31 is the same; they can all be positive tabs, or they can all be negative tabs, as long as the polarity of each first tab 31 is the same, and no special limitation is made here.

[0036] The first adapter piece 40 includes a first segment 41, a second segment 42, and a third segment 43 connected in sequence. The second segment 42 of the first adapter piece 40 is located on the side of the cell assembly 30 with the second side a2. The first segment 41 of the first adapter piece 40 is bent relative to the second segment 42 to the side of the cell assembly 30 with the first side a1, and is electrically connected to the first tab 31 on the first side a1. The first segment 41 of the first adapter piece 40 is also electrically connected to the first terminal 20. The third segment 43 of the first adapter piece 40 is bent relative to the second segment 42 to the side of the cell assembly 30 with the third side a3, and is electrically connected to the first tab 31 on the third side a3. This realizes the electrical connection between each of the first tabs 31 on opposite sides of the cell assembly 30 and the first terminal 20, so that the first terminal 20 serves as an electrode terminal of the battery cell to realize the output and input of electrical energy.

[0037] The aforementioned battery cell has a first tab 31 of the same polarity on both the first side a1 and the third side a3 opposite to the first side a1 of the cell assembly 30, and is electrically connected to the first terminal post 20 through a first adapter piece 40. In other words, the increased number of first tabs 31, and the presence of first tabs 31 on different sides of the cell assembly 30 (i.e., the first side a1 and the third side a3), results in a more uniform current density across the cell assembly 30 during charging, which is beneficial for improving the battery's fast-charging performance.

[0038] Optionally, the first segment 41 and the third segment 43 of the first adapter piece 40 are both bent at approximately 90° toward the same side of the second segment 42, that is, the first segment 41 and the third segment 43 of the first adapter piece 40 are approximately perpendicular to the second segment 42. It should be noted that the included angles between the first segment 41 and the third segment 43 of the first adapter piece 40 and the second segment 42 are related to the shape of the battery cell assembly 30 and can be adjusted according to the shape of the battery cell assembly 30, and are not limited here.

[0039] It should be noted that the number of first tabs 31 on the first side a1 of the battery cell assembly 30 is not limited to one. In some embodiments, the first side a1 of the battery cell assembly 30 has multiple first tabs 31, and the first segment 41 of the first adapter plate 40 is electrically connected to each of the first tabs 31 on the first side a1, so that each of the first tabs 31 on the first side a1 is electrically connected to the first terminal post 20 through the first adapter plate 40. It is understood that the number of first tabs 31 on the first side a1 of the battery cell assembly 30 can be 2, 3, 4 or 5, etc., and is not limited here.

[0040] Similarly, the number of first tabs 31 on the third side a3 of the battery cell assembly 30 is not limited to one. In some embodiments, the third side a3 of the battery cell assembly 30 has multiple first tabs 31, and the third segment 43 of the first adapter plate 40 is electrically connected to each of the first tabs 31 on the third side a3, so that each of the first tabs 31 on the third side a3 is electrically connected to the first terminal post 20 through the first adapter plate 40. It is understood that the number of first tabs 31 on the third side a3 of the battery cell assembly 30 can be 2, 3, 4, or 5, etc., and is not specifically limited here. The number of first tabs 31 on the first side a1 of the battery cell assembly 30 can be the same as or different from the number of first tabs 31 on the third side a3, and is not specifically limited here.

[0041] Please see also Figure 4 As shown in the embodiment of this application, the first segment 41 of the first adapter piece 40 has a first through hole 411. The first tab 31 on the first side a1 passes through the first through hole 411 to the side of the first segment 41 facing away from the battery cell assembly 30, and is welded to the surface of the first segment 41 facing away from the battery cell assembly 30, thereby realizing the mechanical and electrical connection between the first tab 31 and the first segment 41 of the first adapter piece 40. The connection is relatively stable and safe and reliable compared with traditional wire connection, and the process is simple.

[0042] Furthermore, the portion of the first pole post 20 and the first tab 31 located on the side of the first segment 41 away from the cell assembly 30 and / or the first segment 41 of the first adapter piece 40 are welded and fixed, thereby realizing the mechanical and electrical connection between the first pole post 20, the first tab 31 and the first segment 41 of the first adapter piece 40.

[0043] Furthermore, a first insulating film (not shown) is affixed to the surface of the first tab 31 on the side of the first segment 41 facing away from the cell assembly 30, thereby protecting the first tab 31. It is understood that the first insulating film does not cover the area where it is welded to the first terminal post 20.

[0044] Specifically, in the embodiment, the third segment 43 of the first adapter piece 40 has a second through hole 431. The first electrode 31 on the third side a3 of the battery cell assembly 30 passes through the second through hole 431 to the side of the third segment 43 away from the battery cell assembly 30, and is welded to the surface of the third segment 43 away from the battery cell assembly 30, thereby realizing the mechanical and electrical connection between the first electrode 31 and the third segment 43 of the first adapter piece 40. The connection is relatively stable and safe and reliable compared with traditional wire connection, and the process is simple.

[0045] Furthermore, a second insulating film is attached to the surface of the first tab 31 located on the side of the third segment 43 away from the battery cell assembly 30, thereby protecting the first tab 31 using the second insulating film.

[0046] Please see Figures 1 to 3 As shown in the embodiments of this application, the battery cell further includes a second terminal 50 and a second adapter plate 60. The second terminal 50 is disposed on the housing and is located on the same side of the cell assembly 30 as the first terminal 20. The first side a1 and the third side a3 of the cell assembly 30 each have a second tab 32 with a polarity opposite to that of the first tab 31. The second adapter plate 60 includes a fourth segment 61, a fifth segment 62, and a sixth segment 63 connected in sequence.

[0047] The cell assembly 30 also has a fourth side a4 opposite to the second side a2. The fifth segment 62 of the second adapter piece 60 is located on the side of the cell assembly 30 with the fourth side a4. The fourth segment 61 of the second adapter piece 60 is bent relative to the fifth segment 62 to the side of the cell assembly 30 with the first side a1 and is electrically connected to the second tab 32 on the first side a1. The fourth segment 61 of the second adapter piece 60 is electrically connected to the second terminal 50. The sixth segment 63 of the second adapter piece 60 is bent relative to the fifth segment 62 to the side of the cell assembly 30 with the third side a3 and is electrically connected to the second tab 32 on the third side a3. This achieves electrical connection between each of the second tabs 32 on opposite sides of the cell assembly 30 and the second terminal 50, so that the second terminal 50 and the aforementioned first terminal 20 serve as the two electrode terminals of the battery cell, jointly realizing the output and input of electrical energy. In other words, when the first electrode 31 is the positive electrode and the second electrode 32 is the negative electrode, the first electrode post 20 is the positive electrode post and the second electrode post 50 is the negative electrode post; when the first electrode 31 is the negative electrode and the second electrode 32 is the positive electrode, the first electrode post 20 is the negative electrode post and the second electrode post 50 is the positive electrode post.

[0048] Thus, second tabs 32 of the same polarity are provided on both the first side a1 and the third side a3 opposite to the first side a1 of the cell assembly 30, and are electrically connected to the second terminal 50 through the second adapter piece 60. That is to say, the number of second tabs 32 is increased, and second tabs 32 are provided on different sides of the cell assembly 30 (i.e., the first side a1 and the third side a3), so that the current density of the cell assembly 30 is more uniform in all parts during charging, which is beneficial to improving the fast charging performance of the battery.

[0049] Optionally, the fourth segment 61 and the sixth segment 63 of the second adapter piece 60 are both bent at approximately 90° towards the same side of the fifth segment 62, that is, the fourth segment 61 and the sixth segment 63 of the second adapter piece 60 are approximately perpendicular to the fifth segment 62. It should be noted that the included angles between the fourth segment 61 and the sixth segment 63 of the second adapter piece 60 and the fifth segment 62 are related to the shape of the cell assembly 30 and can be adjusted according to the shape of the cell assembly 30, and are not limited here.

[0050] It should be noted that the number of second tabs 32 on the first side a1 of the battery cell assembly 30 is not limited to one. In some embodiments, the first side a1 of the battery cell assembly 30 has multiple second tabs 32, and the fourth segment 61 of the second adapter piece 60 is electrically connected to each of the second tabs 32 on the first side a1, so that each of the second tabs 32 on the first side a1 is electrically connected to the second terminal 50 through the second adapter piece 60. It is understood that the number of second tabs 32 on the first side a1 of the battery cell assembly 30 can be 2, 3, 4 or 5, etc., and is not limited here.

[0051] Similarly, the number of second tabs 32 on the third side a3 of the battery cell assembly 30 is not limited to one. In some embodiments, the third side a3 of the battery cell assembly 30 has multiple second tabs 32, and the sixth segment 63 of the second adapter piece 60 is electrically connected to each of the second tabs 32 on the third side a3, so that each of the second tabs 32 on the third side a3 is electrically connected to the second terminal 50 through the second adapter piece 60. It is understood that the number of second tabs 32 on the third side a3 of the battery cell assembly 30 can be 2, 3, 4, or 5, etc., and is not specifically limited here. The number of second tabs 32 on the first side a1 of the battery cell assembly 30 can be the same as or different from the number of second tabs 32 on the third side a3, and is not specifically limited here.

[0052] Please see also Figure 5As shown in the embodiment of this application, the fourth segment 61 of the second adapter piece 60 has a third through hole 611. The second electrode 32 on the first side a1 passes through the third through hole 611 to the side of the fourth segment 61 facing away from the battery cell assembly 30, and is welded to the surface of the fourth segment 61 facing away from the battery cell assembly 30, thereby realizing the mechanical and electrical connection between the second electrode 32 and the fourth segment 61 of the second adapter piece 60. The connection is relatively stable, safe and reliable compared to traditional wire connections, and the process is simple.

[0053] Furthermore, the second pole post 50 and the second pole tab 32 located on the side of the fourth segment 61 opposite to the cell assembly 30 and / or the fourth segment 61 of the second adapter piece 60 are welded and fixed, thereby realizing the mechanical and electrical connection between the second pole post 50, the second pole tab 32 and the fourth segment 61 of the second adapter piece 60.

[0054] Furthermore, a third insulating film (not shown) is affixed to the surface of the second tab 32 on the side of the fourth segment 61 facing away from the cell assembly 30, thereby protecting the second tab 32. It is understood that the third insulating film does not cover the area where it is soldered to the second terminal 50.

[0055] Specifically, in the embodiment, the sixth segment 63 of the second adapter piece 60 has a fourth through hole 631. The second electrode 32 on the third side a3 of the battery cell assembly 30 passes through the fourth through hole 631 to the side of the sixth segment 63 facing away from the battery cell assembly 30, and is welded to the surface of the sixth segment 63 facing away from the battery cell assembly 30. This achieves mechanical and electrical connection between the second electrode 32 and the sixth segment 63 of the second adapter piece 60. The connection is relatively stable and safe and reliable compared to traditional wire connection, and the process is simple.

[0056] Furthermore, a fourth insulating film (not shown) is attached to the surface of the second tab 32 on the side of the sixth segment 63 opposite to the cell assembly 30, thereby protecting the second tab 32 using the fourth insulating film.

[0057] In a specific embodiment, the battery cell further includes an insulating support block 70. This insulating support block 70 is disposed on the side of the cell assembly 30 having the third side a3, and is located between the third segment 43 of the first adapter piece 40 and the sixth segment 63 of the second adapter piece 60. Thus, the insulating support block 70 serves two purposes: firstly, it insulates the space between the third segment 43 of the first adapter piece 40 and the sixth segment 63 of the second adapter piece 60; secondly, it supports the cell assembly 30, making it more stable within the casing. It should be noted that the insulating support block 70 can be made of insulating plastic, or other insulating materials, as long as it provides insulation and support; no limitation is made here.

[0058] Furthermore, the battery cell also includes a fifth insulating film (not shown), which is attached to the surface of the third segment 43 of the first adapter piece 40, the insulating support block 70, and the sixth segment 63 of the second adapter piece 60 on the side away from the cell assembly 30, thereby protecting the third segment 43 of the first adapter piece 40 and the sixth segment 63 of the second adapter piece 60.

[0059] In embodiments of this application, the housing includes a shell and a cover plate 12. The shell has an inner cavity serving as the aforementioned receiving cavity and an opening communicating with the receiving cavity. The cover plate 12 covers the opening of the shell to seal the opening. The first side a1 of the cell assembly 30 faces the cover plate 12. The first terminal 20 and the second terminal 50 are both insulatedly disposed on the cover plate 12.

[0060] The battery cell also includes an insulating member 90 disposed between the cell assembly 30 and the cover plate 12. The insulating member 90 has a first through hole (not shown) opposite the first terminal 20 and a second through hole (not shown) opposite the second terminal 50. The first segment 41 of the first adapter piece 40 and the fourth segment 61 of the second adapter piece 60 are both located between the insulating member 90 and the cell assembly 30. The first terminal 20 passes through the first through hole in the insulating member 90 and is welded and fixed to the first segment 41 of the first adapter piece 40 and / or the first tab 31 on the first side a1, thereby achieving electrical connection between the first adapter piece 40 and the first terminal 20. The second terminal 50 passes through the second through hole in the insulating member 90 and is welded and fixed to the fourth segment 61 of the second adapter piece 60 and / or the second tab 32 on the first side a1, thereby achieving electrical connection between the second adapter piece 60 and the second terminal 50.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: First pole (20); A battery cell assembly (30) has a first side (a1), a second side (a2), and a third side (a3). The first side (a1) faces the first terminal post (20), the third side (a3) ​​is opposite to the first side (a1), and the second side (a2) is located between the first side (a1) and the third side (a3). Both the first side (a1) and the third side (a3) ​​have first tabs (31). The first adapter piece (40) includes a first segment (41), a second segment (42), and a third segment (43) connected in sequence. The second segment (42) is located on the side of the cell assembly (30) with the second side surface (a2). The first segment (41) is bent relative to the second segment (42) to the side of the cell assembly (30) with the first side surface (a1) and is electrically connected to the first tab (31) on the first side surface (a1). The first segment (41) is electrically connected to the first terminal post (20). The third segment (43) is bent relative to the second segment (42) to the side of the cell assembly (30) with the third side surface (a3) ​​and is electrically connected to the first tab (31) on the third side surface (a3).

2. The battery cell according to claim 1, characterized in that, The first segment (41) has a first through hole (411), and the first tab (31) on the first side (a1) passes through the first through hole (411) to the side of the first segment (41) opposite to the cell assembly (30), and is welded to the surface of the first segment (41) opposite to the cell assembly (30).

3. The battery cell according to claim 2, characterized in that, The first pole post (20) and the first tab (31) are located on the side of the first segment (41) away from the cell assembly (30) and / or the first segment (41) is welded and fixed.

4. The battery cell according to claim 1, characterized in that, The third segment (43) has a second through hole (431), and the first electrode (31) on the third side (a3) ​​passes through the second through hole (431) to the side of the third segment (43) away from the cell assembly (30), and is welded to the surface of the third segment (43) away from the cell assembly (30).

5. The battery cell according to claim 1, characterized in that, The battery cell assembly (30) has a plurality of first tabs (31) on its first side surface (a1), and the first segment (41) is electrically connected to each of the first tabs (31) on the first side surface (a1); and / or The third side (a3) ​​of the battery cell assembly (30) has a plurality of first tabs (31), and the third segment (43) is electrically connected to each of the first tabs (31) on the third side (a3).

6. The battery cell according to claim 1, characterized in that, The battery cell also includes a second terminal (50) and a second adapter plate (60). The second terminal (50) and the first terminal (20) are located on the same side of the cell assembly (30). The first side (a1) and the third side (a3) ​​each have a second tab (32) with a polarity opposite to that of the first tab (31). The second adapter plate (60) includes a fourth segment (61), a fifth segment (62) and a sixth segment (63) connected in sequence. The cell assembly (30) also has a fourth side (a4) opposite to the second side (a2), the fifth segment (62) is located on the side of the cell assembly (30) having the fourth side (a4), the fourth segment (61) is bent relative to the fifth segment (62) to the side of the cell assembly (30) having the first side (a1) and is electrically connected to the second tab (32) on the first side (a1), the fourth segment (61) is electrically connected to the second pole (50); the sixth segment (63) is bent relative to the fifth segment (62) to the side of the cell assembly (30) having the third side (a3) ​​and is electrically connected to the second tab (32) on the third side (a3).

7. The battery cell according to claim 6, characterized in that, The fourth segment (61) has a third through hole (611), and the second electrode (32) on the first side (a1) passes through the third through hole (611) to the side of the fourth segment (61) away from the cell assembly (30), and is welded to the surface of the fourth segment (61) away from the cell assembly (30). The second pole post (50) and the second pole tab (32) are located on the side of the fourth segment (61) away from the cell assembly (30) and / or the fourth segment (61) is welded and fixed.

8. The battery cell according to claim 6, characterized in that, The sixth segment (63) has a fourth through hole (631), and the second electrode (32) on the third side (a3) ​​passes through the fourth through hole (631) to the side of the sixth segment (63) away from the cell assembly (30), and is welded to the surface of the sixth segment (63) away from the cell assembly (30).

9. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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