Battery assembly, battery pack and electric equipment

Abstract

The utility model discloses a battery assembly, a battery pack and electric equipment, and belongs to the technical field of batteries, the battery assembly comprises: a plurality of single batteries, the plurality of single batteries are arranged along a first direction, each single battery comprises a first pole member, a second pole member and a bus member, the first pole member and the second pole member are arranged at an interval along a second direction, and the bus member is arranged between the first pole member and the second pole member; the first direction intersects with the second direction, the first pole piece and the confluence piece are integrally formed, and the confluence piece of the single battery is connected with the second pole piece on the adjacent single battery. The first pole piece and the confluence piece are integrally processed and formed, so that the first pole piece and the confluence piece become an integrated structure, the confluence piece is not an independent structure any more, the integrally-formed connection effect is better, the confluence piece and the first pole piece do not need to be welded, the welding area on the confluence piece is reduced, the probability of undesirable phenomena on the confluence piece is reduced, and the service life of the battery is prolonged. And the structural strength of the battery assembly is also improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery assembly, a battery pack and a power consumption equipment. BACKGROUND

[0002] A single battery generally comprises a shell, a cover plate, a positive pole, a negative pole, an inner core and the like. Two single batteries are connected in series through busbars. However, when the busbars are connected with the single batteries, adverse reactions are easily generated, the connection effect is poor, and the normal use of the battery can be affected. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims to overcome the technical problem that adverse reactions are easily generated when busbars are connected with single batteries, and the connection effect is poor. Another object of the utility model is to provide a battery pack. A third object of the utility model is to provide a power consumption equipment.

[0004] TECHNICAL SCHEME The battery assembly provided in the embodiment of the application comprises:

[0005] A plurality of single batteries, the plurality of single batteries are arranged along a first direction, each single battery comprises a first pole piece, a second pole piece and a busbar piece, the first pole piece and the second pole piece are arranged along a second direction, the first direction intersects the second direction, the first pole piece and the busbar piece are integrally formed, and the busbar piece of the single battery is connected with the second pole piece on an adjacent single battery.

[0006] In some embodiments, the busbar piece comprises:

[0007] A first connecting portion is located on one side of the first pole piece along a third direction and connected with the first pole piece.

[0008] A second connecting portion is located on one side of the second pole piece on an adjacent single battery along the third direction and connected with the second pole piece on the adjacent single battery.

[0009] A bending portion is located between the first connecting portion and the second connecting portion and connected with the first connecting portion and the second connecting portion respectively, the bending portion has a convex structure and / or a concave structure arranged along the third direction.

[0010] The third direction intersects the first direction and the second direction.

[0011] In some embodiments, the second connecting portion has a first positioning hole, and the second pole piece comprises:

[0012] A body is arranged on one side of the single battery.

[0013] A positioning column is located on one side of the body along the third direction and is connected with the body, and the positioning column is arranged in the first positioning hole.

[0014] In some embodiments, the first positioning hole is a waist-shaped hole, the first positioning hole extends along the first direction, and the side of the positioning column away from the bending portion is spaced apart from the first positioning hole.

[0015] In some embodiments, the single battery has a placement groove formed between the first pole piece and the second pole piece, and a plurality of placement grooves on a plurality of single batteries combine to form a bearing area.

[0016] The battery assembly comprises:

[0017] A circuit board piece is arranged in the bearing area and connected with a plurality of single batteries.

[0018] In some embodiments, the busbar has a second positioning hole; the circuit board piece comprises:

[0019] A support portion is arranged in the bearing area and connected with a plurality of single batteries.

[0020] A circuit portion is located on the side of the support portion away from the single battery and is connected with the support portion.

[0021] A lap portion is connected with the busbar through the circuit portion, the lap portion comprises a main body and a bending structure, one end of the main body is connected with the circuit portion, the other end of the main body is connected with the bending structure, at least part of the bending structure is embedded into the second positioning hole and connected with the busbar.

[0022] In some embodiments, in the first direction, the first pole piece of the single battery is spaced apart from the second pole piece of the adjacent single battery.

[0023] In some embodiments, the battery assembly comprises:

[0024] An adhesive piece is located between two adjacent single batteries and is connected with two adjacent single batteries respectively, and the adhesive piece is used to space apart two adjacent single batteries.

[0025] A battery pack comprising the battery assembly of any one of the above.

[0026] A power consumption device comprising the battery assembly of any one of the above or the battery pack of the above.

[0027] Beneficial effects: the battery assembly of the embodiment of the application comprises: a plurality of single batteries, the plurality of single batteries are arranged along a first direction, each single battery comprises a first pole piece, a second pole piece and a busbar piece, the first pole piece and the second pole piece are arranged at intervals along a second direction, the first direction intersects the second direction, the first pole piece is integrally formed with the busbar piece, and the busbar piece of the single battery is connected with the second pole piece on an adjacent single battery. By integrally processing and forming the first pole piece and the busbar piece, the two become an integrated structure, the busbar piece is no longer an independent structure, the integrated forming has better connection effect, the busbar piece and the first pole piece do not need to be welded, the welding area on the busbar piece is reduced, the probability of adverse phenomena occurring on the busbar piece is reduced, and the structural strength of the battery assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a perspective view of the battery assembly of the embodiment of the application;

[0030] Figure 2 It is a perspective view of the single battery of the embodiment of the application;

[0031] Figure 3 It is a perspective view of the busbar piece of the embodiment of the application, wherein the first positioning hole is a circular hole;

[0032] Figure 4 It is a perspective view of the busbar piece of the embodiment of the application, wherein the first positioning hole is a waist-shaped hole;

[0033] Figure 5 It is a perspective view of the battery assembly of the embodiment of the application, wherein the circuit board piece is not drawn;

[0034] Figure 6 It is a perspective view of the circuit board piece of the embodiment of the application;

[0035] Figure 7 It is an enlarged view of area A in the embodiment of the application; Figure 6

[0036] Figure 8 It is a perspective view of the lap joint part of the embodiment of the application;

[0037] Figure 9 It is a front view of the battery assembly of the embodiment of the application; ​

[0038] Explanation of reference signs: 10 - single battery; 11 - first pole piece; 12 - second pole piece; 121 - body; 122 - positioning column; 13 - busbar piece; 131 - first connecting part; 132 - second connecting part; 1321 - first positioning hole; 133 - bending part; 134 - second positioning hole; 14 - placing groove; 15 - bearing area; 20 - circuit board piece; 21 - supporting part; 22 - circuit part; 23 - lapping part; 231 - main body; 232 - bending structure; 30 - adhesive piece; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise specifically limited.

[0041] The single battery generally includes a shell, a cover plate, a positive pole, a negative pole, an inner core, an explosion-proof valve, a liquid injection hole and the like. Two single batteries are connected in series through a busbar. The busbar and the single battery are two independent components, which are generally connected together by laser welding. The welding of the busbar is prone to false welding, blasting, burning and other adverse reactions, thereby causing voltage defects when multiple single batteries are connected in series, and structural weakness after connection of multiple single batteries, and the like. Therefore, the connection effect when the busbar and the single battery are welded can be poor, affecting the normal use of the battery.

[0042] Therefore, the embodiments of the present application provide a battery assembly to overcome at least one of the above technical problems.

[0043] Please refer to Figure 1 and Figure 2In the embodiment of the present application, the battery assembly comprises a plurality of single batteries 10. The plurality of single batteries 10 are arranged along a first direction X, each single battery 10 comprises a first pole piece 11, a second pole piece 12 and a busbar 13, the first pole piece 11 and the second pole piece 12 are arranged at intervals along a second direction Y, the first direction X intersects the second direction Y, the first pole piece 11 is integrally formed with the busbar 13, and the busbar 13 of the single battery 10 is connected with the second pole piece 12 on the adjacent single battery 10.

[0044] It can be understood that when the battery assembly is arranged, a plurality of single batteries 10 can be arranged along the first direction X, which is the width direction of the single battery 10. Arranging along this direction can make the large faces of the two adjacent single batteries 10 opposite to each other, and the plurality of single batteries 10 can occupy a smaller space size when arranged. The single battery 10 includes a first pole piece 11 and a second pole piece 12. The first pole piece 11 is the positive electrode structure of the single battery 10, and the second pole piece 12 is the negative electrode structure of the single battery 10, or the first pole piece 11 is the negative electrode structure of the single battery 10, and the second pole piece 12 is the positive electrode structure of the single battery 10. The first pole piece 11 and the second pole piece 12 on each single battery 10 are arranged at intervals along the second direction Y, which is the length direction of the single battery 10. The second direction Y intersects the first direction X, and preferably, the second direction Y is perpendicular to the first direction X. The busbar 13 on the single battery 10 can be integrally formed with the first pole piece 11 to form the positive electrode structure or the negative electrode structure of the battery. Part of the busbar 13 on the single battery 10 can extend in the direction of the adjacent single battery 10 and extend to the position of the second pole piece 12 on the adjacent single battery 10 to be connected with the second pole piece 12. Since the first pole piece 11 on the single battery 10 and the second pole piece 12 on the adjacent single battery 10 are of different electrode structures (positive electrode structure and negative electrode structure), they are connected through the busbar 13, so that the two adjacent single batteries 10 are connected in series. Through this connection form, it is convenient to connect a plurality of single batteries 10 to form a battery assembly. In the original battery assembly arrangement process, the busbar 13 is an independent structure, which needs to be welded with the different electrode structures on the two adjacent single batteries 10, such as laser welding. In the single battery 10 processing process, the first pole piece 11 and the busbar 13 are integrally formed by injection molding, so that they become an integrated structure (the busbar 13 is no longer an independent structure, reducing the number of parts on the battery assembly). The connection effect of the two is good. When the two adjacent single batteries 10 are connected through the busbar 13, the busbar 13 does not need to be welded with one of the single batteries 10 (the busbar 13 and the first pole piece 11 on one of the single batteries 10 are an integral structure, and do not need to be welded, and the connection between the two has higher strength). Therefore, the welding area of the busbar 13 is reduced, the probability of virtual welding, point explosion, and burning of the busbar 13 is reduced, the welding position is reduced, the stability of the voltage on the battery assembly is improved to a certain extent, and the structural strength of the battery assembly is improved.

[0045] Meanwhile, the connection between the busbar 13 and the first pole piece 11 on the single battery 10 by welding increases the cost and maintenance cost of the laser welding equipment, and the cost of the battery assembly during processing is high. In the present application, the busbar 13 and the first pole piece 11 are integrally processed and formed, and the two do not need to be welded, which can reduce the cost and maintenance cost of the welding equipment; also can reduce the number of parts during the production and processing of the battery assembly, thereby reducing the cost during the development and processing of the battery assembly.

[0046] Please refer to Figure 1 , Figure 2 and Figure 3 , in combination with the above embodiments, in some embodiments, the busbar 13 includes a first connecting portion 131, a second connecting portion 132, and a bending portion 133.

[0047] The first connecting portion 131 is located on one side of the first pole piece 11 along the third direction Z, and is connected with the first pole piece 11. The second connecting portion 132 is located on one side of the second pole piece 12 on the adjacent single battery 10 along the third direction Z, and is connected with the second pole piece 12 on the adjacent single battery 10. The bending portion 133 is located between the first connecting portion 131 and the second connecting portion 132, and is connected with the first connecting portion 131 and the second connecting portion 132 respectively, and the bending portion 133 has a protruding structure and / or a recess structure arranged along the third direction Z. The third direction Z intersects with the first direction X and the second direction Y.

[0048] It can be understood that the first connecting portion 131 on the busbar 13 is arranged at one side of the first pole piece 11 along the third direction Z, that is, at the top surface position of the first pole piece 11, so that the first connecting portion 131 is connected with the top surface of the first pole piece 11, the top surface area of the first pole piece 11 is large, and the first connecting portion 131 can be connected with the bottom surface with a large area, which facilitates connection and can increase the connection area and improve the current carrying capacity. The third direction Z can be the height direction of the single battery 10, and further, the third direction Z can be the direction from the bottom of the single battery 10 to the top of the single battery 10, and the third direction Z intersects with the first direction X and the second direction Y, and preferably, the third direction Z is perpendicular to the first direction X and the second direction Y. The second connecting portion 132 on the busbar 13 is connected with the second pole piece 12 on the adjacent single battery 10, and the second connecting portion 132 is arranged at one side of the second pole piece 12 along the third direction Z, that is, the bottom surface with a large area of the second connecting portion 132 is connected with the top surface with a large area of the second pole piece 12, which facilitates connection and can also increase the connection area of the second connecting portion 132 and the second pole piece 12 and improve the current carrying capacity. The first connecting portion 131 and the second connecting portion 132 are connected through the bending portion 133, so that the current can be conducted between the first connecting portion 131 and the second connecting portion 132.

[0049] The bending portion 133 can have a structure protruding along the third direction Z, such as an arch shape. When the volumes of the two adjacent single batteries 10 expand, the two single batteries 10 will be pulled by the busbar 13, and the directions of the pulling forces are opposite. The protruding structure can buffer the opposite pulling forces to some extent. The opposite pulling forces can cause the protruding structure to deform, the protruding curvature of the protruding structure gradually decreases, and the protruding structure tends to be horizontal, but the busbar 13 is not damaged and can still work normally (if the busbar 13 is entirely flat, the busbar 13 can be torn and damaged when subjected to two opposite pulling forces, which affects its normal work). The bending portion 133 can have a structure recessed along the third direction Z, and the effect is the same as the protruding structure. The bending portion 133 can be provided with both protruding structures and recessed structures (such as a wave shape), which can withstand a larger deformation amplitude and have a better buffering effect.

[0050] Please refer to Figure 1 , Figure 2 and Figure 3In combination with the above embodiments, in some embodiments, the second connecting portion 132 has a first positioning hole 1321. The second pole piece 12 includes a body 121 and a positioning column 122. The body 121 is arranged at one side of the single battery 10. The positioning column 122 is located at one side of the body 121 along the third direction Z and is connected with the body 121. The positioning column 122 is arranged in the first positioning hole 1321.

[0051] It can be understood that the first positioning hole 1321 can be arranged on the second connecting portion 132 of the busbar 13, and the positioning column 122 is arranged on the body 121 of the second pole piece 12. The size of the positioning column 122 is matched with the size of the first positioning hole 1321, and the extending directions of the two are the same. When the second connecting portion 132 of the busbar 13 is connected with the second pole piece 12, the positioning column 122 can be smoothly arranged in the first positioning hole 1321. Then, the positioning column 122 and the first positioning hole 1321 are connected by mechanical hot pressing, so as to realize the connection between the busbar 13 and the second pole piece 12. The structure positions the busbar 13, ensures the accuracy and stability of the position of the second connecting portion 132 of the busbar 13 connected with the second pole piece 12, and avoids the deviation of the position of the two in the connection process.

[0052] Please refer to Figure 4 In combination with the above embodiments, in some embodiments, the first positioning hole 1321 is a waist-shaped hole, the first positioning hole 1321 extends along the first direction X, and the side of the positioning column 122 away from the bending portion 133 is arranged in a spaced manner with the first positioning hole 1321.

[0053] It can be understood that the first positioning hole 1321 can be arranged as a waist-shaped hole extending along the first direction X. When the positioning column 122 is arranged in the first positioning hole 1321, the side of the positioning column 122 toward the bending portion 133 is arranged in a matched manner with the inner wall of the first positioning hole 1321, which can position the connection between the busbar 13 and the second pole piece 12 to a certain extent. Meanwhile, the side of the positioning column 122 away from the bending portion 133 is arranged in a spaced manner with the first positioning hole 1321, so that when the adjacent two single batteries 10 are expanded to a large extent and the bending portion 133 cannot play a buffering role, the positioning column 122 can move in the first positioning hole 1321 in a direction away from the bending portion 133, so as to avoid the tearing of the busbar 13 and ensure the integrity of the busbar 13. During the movement, the positioning column 122 is still connected with the two sides of the first positioning hole 1321 along the second direction Y, so that the connection between the positioning column 122 and the second connecting portion 132 can be ensured, and the conduction of the current can be ensured, thereby avoiding the open circuit of the battery assembly when the single battery 10 is expanded to a large extent.

[0054] Please refer to Figure 1 , Figure 5 andFigure 6 In some embodiments, the monomer battery 10 has a placement slot 14 formed between the first pole piece 11 and the second pole piece 12, and a plurality of placement slots 14 on a plurality of monomer batteries 10 combine to form a bearing area 15. The battery assembly includes a circuit board piece 20 disposed in the bearing area 15 and connected to the plurality of monomer batteries 10.

[0055] It can be understood that the placement slot 14 is formed between the first pole piece 11 and the second pole piece 12 on each monomer battery 10, and when the plurality of monomer batteries 10 are arranged in the first direction X, the placement slots 14 on each monomer battery 10 are connected to each other to form the bearing area 15. The circuit board piece 20 on the battery assembly is disposed in the bearing area 15, and then the circuit board piece 20 is connected to the plurality of monomer batteries 10 by screw connection, buckle connection or adhesive connection. By providing the bearing area 15 on the plurality of monomer batteries 10, the circuit board piece 20 is conveniently accommodated, and the space occupied by the circuit board piece 20 is reduced.

[0056] Please refer to Figure 1 , Figure 6 , Figure 7 and Figure 8 , in combination with the above embodiments, in some embodiments, the bus piece 13 has a second positioning hole 134; the circuit board piece 20 includes a support portion 21, a circuit portion 22 and a lap portion 23.

[0057] The support portion 21 is disposed in the bearing area 15 and connected to the plurality of monomer batteries 10. The circuit portion 22 is located on the side of the support portion 21 away from the monomer battery 10 and connected to the support portion 21. The circuit portion 22 is connected to the bus piece 13 through the lap portion 23, and the lap portion 23 includes a main body 231 and a bending structure 232. One end of the main body 231 is connected to the circuit portion 22, and the other end of the main body 231 is connected to the bending structure 232. At least part of the bending structure 232 is embedded into the second positioning hole 134 and connected to the bus piece 13.

[0058] It can be understood that the support part 21 on the circuit board piece 20 is arranged in the bearing area 15 formed by the plurality of single batteries 10, and the support part 21 can be connected with the plurality of single batteries 10 by screw connection, buckle connection or glue connection. The circuit part 22 is arranged on the side of the support part 21 away from the plurality of single batteries 10. The support part 21 can be a tray structure for supporting the circuit part 22, facilitating the installation of the circuit part 22. The circuit part 22 can be an FPC circuit board, and the circuit part 22 can be connected to the support part 21 by gluing, so as to realize the positioning and fixing of the circuit part 22. On the battery assembly, the circuit part 22 is connected with the corresponding busbar 13 through the lap joint part 23. The lap joint part 23 includes a main body 231 and a bending structure 232, and the extension directions of the main body 231 and the bending structure 232 intersect, preferably, the extension directions of the two are perpendicular to each other. One end of the main body 231 is connected with the circuit part 22, such as welding, and the other end of the main body 231 is connected with the bending structure 232. The main body 231 and the bending structure 232 can be an integral structure (the bending structure 232 can be an end of the lap joint part 23 bent to form), which is convenient for processing. The second positioning hole 134 can be arranged on the first connecting part 131, the second connecting part 132 or the bending part 133 of the busbar 13. When the lap joint part 23 is connected with the corresponding busbar 13, the bending structure 232 on the lap joint part 23 can be first embedded into the corresponding second positioning hole 134, and then the lap joint part 23 is welded with the busbar 13. The positioning structure plays a positioning role for the lap joint part 23, avoids the position deviation of the lap joint part 23 during the connection with the busbar 13, is beneficial to the connection of the two, and reduces the connection difficulty. At the same time, the welding positioning tool is not needed when the lap joint part 23 is welded with the busbar 13, which reduces the manufacturing cost of the lap joint part 23 during welding.

[0059] Please refer to Figure 1 , in combination with the above embodiments, in some embodiments, in the first direction X, the first pole piece 11 of the single battery 10 is arranged spaced apart from the second pole piece 12 of the adjacent single battery 10.

[0060] It can be understood that the plurality of single batteries 10 are arranged along the first direction X, and in two adjacent single batteries 10, one single battery 10 is provided with the first pole piece 11 on one side along the first direction X, and the other single battery 10 is provided with the second pole piece 12. That is, in the arrangement process of the plurality of single batteries 10, the first pole piece 11 and the second pole piece 12 on the plurality of single batteries 10 are alternately arranged along the first direction X. Since the busbar 13 is integrally formed with the first pole piece 11, when the two adjacent single batteries 10 are connected in series through the busbar 13, the busbar 13 can be directly connected with the second pole piece 12 on the adjacent single battery 10 along the first direction X, so that the length of the busbar 13 can be minimized, the material of the busbar 13 can be saved, the cost can be reduced, and the connection between the busbar 13 and the second pole piece 12 on the adjacent single battery 10 is facilitated.

[0061] Please refer to Figure 9 In combination with the above embodiments, in some embodiments, the battery assembly comprises an adhesive piece 30, which is located between and connected with the two adjacent single batteries 10, and is used for spacing the two adjacent single batteries 10.

[0062] It can be understood that the adhesive piece 30 can be arranged between the two adjacent single batteries 10, and the two sides of the adhesive piece 30 along the first direction X are respectively adhesively connected with the corresponding single batteries 10, so as to connect the two adjacent single batteries 10. The adhesive piece 30 can space the two adjacent single batteries 10, and can reduce the influence of the heat of one battery on the other battery. Meanwhile, the adhesive piece 30 can also be provided in a multi-layer structure, and the outer layers on the two sides can be ordinary adhesive materials, and the middle layer can be a heat insulation material such as polyethylene foam, polyurethane foam or the like, so as to better improve the heat insulation effect of the adhesive piece 30 and further reduce the mutual influence of the heat of the two adjacent single batteries 10.

[0063] A battery pack comprising the battery assembly described above. The battery pack is used for storing and releasing electric energy, and comprises a box body, a circuit board piece 20 and a plurality of single batteries 10 described above, which are accommodated in the box body. The battery pack can be a battery module, a battery cluster, a battery stack, a battery tower, a battery array or the like, which is a charging and discharging structure composed of a plurality of single batteries 10 and a circuit board piece 20. The single battery 10 includes but is not limited to a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, and the like, and the embodiments of the present disclosure are not limited thereto.

[0064] A power consuming device comprising the battery assembly described above, or comprising the battery pack described above.

[0065] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0066] The battery assembly, the battery pack and the electric equipment provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment descriptions are only used to help understand the technical solutions and the core ideas of the present application; the ordinary skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly, characterized in that, include: Multiple single-cell batteries (10) are arranged along a first direction (X). Each single-cell battery (10) includes a first terminal (11), a second terminal (12), and a busbar (13). The first terminal (11) and the second terminal (12) are spaced apart along a second direction (Y). The first direction (X) intersects with the second direction (Y). The first terminal (11) and the busbar (13) are integrally formed. The busbar (13) of the single-cell battery (10) is connected to the second terminal (12) on the adjacent single-cell battery (10).

2. The battery assembly according to claim 1, characterized in that, The busbar (13) includes: The first connecting part (131) is located on one side of the first pole post (11) along the third direction (Z) and is connected to the first pole post (11); The second connection part (132) is located on one side of the second pole piece (12) on the adjacent single cell (10) along the third direction (Z) and is connected to the second pole piece (12) on the adjacent single cell (10). A bending portion (133) is located between the first connecting portion (131) and the second connecting portion (132) and is connected to the first connecting portion (131) and the second connecting portion (132) respectively. The bending portion (133) has a protruding structure and / or a recessed structure disposed along the third direction (Z). The third direction (Z) intersects with the first direction (X) and the second direction (Y).

3. The battery assembly according to claim 2, characterized in that, The second connecting portion (132) has a first positioning hole (1321); the second pole member (12) includes: The main body (121) is disposed on one side of the single cell (10); The positioning post (122) is located on one side of the body (121) along the third direction (Z) and is connected to the body (121). The positioning post (122) passes through the first positioning hole (1321).

4. The battery assembly according to claim 3, characterized in that, The first positioning hole (1321) is an oblong hole, and the first positioning hole (1321) extends along the first direction (X). The positioning post (122) is spaced apart from the first positioning hole (1321) on the side opposite to the bent part (133).

5. The battery assembly according to claim 1, characterized in that, The single cell (10) has a placement groove (14) formed between the first electrode post (11) and the second electrode post (12). The multiple placement grooves (14) on the multiple single cells (10) are combined to form a bearing area (15). The battery assembly includes: A circuit board (20) is disposed within the bearing area (15) and connected to a plurality of the individual battery cells (10).

6. The battery assembly according to claim 5, characterized in that, The busbar (13) has a second positioning hole (134); the circuit board (20) includes: A support portion (21) is disposed within the bearing area (15) and connected to a plurality of individual battery cells (10); The circuit section (22) is located on the side of the support section (21) away from the single cell (10) and is connected to the support section (21); The circuit part (22) is connected to the busbar (13) through the overlapping part (23). The overlapping part (23) includes a main body (231) and a bending structure (232). One end of the main body (231) is connected to the circuit part (22), and the other end of the main body (231) is connected to the bending structure (232). At least a portion of the bending structure (232) is embedded in the second positioning hole (134) and connected to the busbar (13).

7. The battery assembly according to claim 1, characterized in that, In the first direction (X), the first terminal (11) of the single cell (10) is spaced apart from the second terminal (12) of the adjacent single cell (10).

8. The battery assembly according to claim 1, characterized in that, The battery assembly includes: An adhesive (30) is located between two adjacent individual cells (10) and is connected to the two adjacent individual cells (10) respectively. The adhesive (30) is used to space between two adjacent individual cells (10).

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

10. An electrical appliance, characterized in that, It includes the battery assembly as described in any one of claims 1 to 8, or the battery pack as described in claim 9.

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