WO2021249349A1

WO2021249349A1 - Connecting assembly, battery module and battery pack

Info

Publication number: WO2021249349A1
Application number: PCT/CN2021/098656
Authority: WO
Inventors: 吴婷婷; 冯俊敏; 张万财
Original assignee: 厦门海辰新能源科技有限公司
Priority date: 2020-06-07
Filing date: 2021-06-07
Publication date: 2021-12-16

Abstract

A connecting assembly (200) for connecting two cells, comprising a first connecting piece (210), a second connecting piece (250), and a connecting plate (230). The first connecting piece (210) is electrically connected to one of the cells (110), and the second connecting piece (250) is electrically connected to the other one of the cells (110). One end of the connecting plate (230) is welded and electrically connected to the first connecting piece (210), and the other end of the connecting plate (230) is welded and electrically connected to the second connecting piece (250).

Description

Connecting components, battery modules and battery packs

Technical field

This application relates to the field of batteries, and specifically, to connection assemblies, battery modules, and battery packs.

Background technique

The battery module is obtained by combining lithium-ion batteries in series and parallel. Its structure must support, fix and protect the cell. For some special single battery boxes, the width is narrow and the height is relatively high. Therefore, it is usually installed on its side. The difference in the installation structure will cause the volume energy density and weight energy density of the battery module to be relatively high. Big difference.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the prior art.

The connecting assembly for connecting two single batteries according to the embodiment of the present application includes: a first connecting piece, the first connecting piece is electrically connected to one of the single batteries; a second connecting piece, the first connecting piece Two connecting pieces are electrically connected to the other of the single cells; a connecting plate, one end of the connecting plate is welded and electrically connected to the first connecting piece, and the other end of the connecting plate is connected to the second connecting piece Solder and electrically connected.

According to the connecting assembly for connecting two single cells according to the embodiment of the present application, the connecting plate and one of the single cells are welded by using the first connecting piece, and the connecting plate and the other single battery are welded by using the second connecting piece Therefore, the volume of the battery module can be reduced while also reducing the weight, which is beneficial to increase the volume energy density and the weight energy density of the battery module.

In some embodiments, the connecting assembly further includes a first welding block, and one end of the connecting plate is welded to the first connecting piece through the first welding block.

In some embodiments, one end of the connecting plate has a first positioning hole, the first connecting piece has a first connecting hole, and both ends of the first welding block respectively extend into the first positioning hole, the A first connecting hole, and the first welding block is respectively welded to the first connecting piece and the connecting plate.

In some embodiments, the wall of the first welding block is welded to the inner wall of the first positioning hole; the wall of the first welding block is welded to the inner wall of the first connecting hole.

In some embodiments, the first welding block includes a top, a middle, and a bottom that are connected in sequence, one of the top and the bottom extends into the first positioning hole, and the other extends into the first positioning hole. Connection hole.

In some embodiments, the top part is cylindrical, and the bottom part is a square column.

In some embodiments, the two opposite surfaces of the middle portion respectively abut against the first connecting piece and the connecting plate.

In some embodiments, the welding method of the first welding block is penetration welding or seam welding.

In some embodiments, the connecting assembly further includes a second welding block, and the other end of the connecting plate is welded to the second connecting piece through the second welding block.

In some embodiments, the other end of the connecting plate has a second positioning hole, the second connecting piece has a second connecting hole, and both ends of the second welding block respectively extend into the second positioning hole and the second positioning hole. The second connecting hole, and the second welding block is respectively welded to the second connecting piece and the connecting plate.

In some embodiments, the wall of the second welding block is welded to the inner wall of the second positioning hole; the wall of the second welding block is welded to the inner wall of the second connecting hole.

In some embodiments, the configuration of the second welding nugget is the same as that of the first welding nugget.

In some embodiments, the materials of the first connecting piece, the second connecting piece, the connecting plate, the first welding block and the second welding block are all aluminum.

In some embodiments, the first connecting piece includes: a first plate body, the first plate body is suitable for welding with the single battery; a second plate body, the second plate body and the first plate body An included angle is formed between one plate body, the second plate body is suitable for being attached to the other side surface of the single battery, and the second plate body is welded to the connecting plate.

In some embodiments, the structure of the second connecting piece is the same as the structure of the first connecting piece.

The battery module according to the embodiment of the present application includes a plurality of single cells and a connecting assembly, and the connecting assembly is the above-mentioned connecting group for connecting two single cells.

According to the battery pack of the embodiment of the present application, the battery pack includes a plurality of battery modules as described above connected in series or/and in parallel.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 shows a schematic diagram of the connection structure of a single cell in the prior art.

Fig. 2 shows a schematic structural diagram of a battery module provided by an embodiment of the present application.

Fig. 3 shows a schematic structural diagram of a connection assembly provided by an embodiment of the present application.

FIG. 4 shows a schematic diagram of the structure of the first connecting piece, the first welding block, and the connecting plate provided by the embodiment of the present application.

Fig. 5 shows a schematic structural diagram of a first welding block provided by an embodiment of the present application.

Icon: 100-battery module; 110-single cell; 111-pole; 200-connecting component; 210-first connecting piece; 211-first connecting hole; 220-first soldering block; 221-bottom; 222 -Middle column; 223-top; 230-connecting plate; 231-first positioning hole; 232-second positioning hole; 240-second welding block; 250-second connecting piece.

detailed description

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying that The device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. Further, in the description of the present application, unless otherwise specified, "plurality" means two or more.

FIG. 1 shows a schematic diagram of the connection structure of a single cell in the prior art. Please refer to FIG. 1. In the prior art, the connection between the pair of single cells 110' is mainly to provide an L-shaped connecting piece above the single cell 110' 210', then a bracket 260' is arranged below the connecting piece 210', and a connecting plate 230' is arranged above the connecting piece 210', and the connecting plate 230', the connecting piece 210' and the bracket 260' are fixed by screws 270'. This connection method will increase the space occupied by the height of the module, and due to the weight of the fixing bracket 260' and the screw 270', it is not conducive to increasing the volume energy density and weight energy density of the battery.

In addition, due to the low hardness of aluminum, it is prone to deformation; therefore, the aluminum connecting plate and the screw are easily deformed, reducing reliability; usually nickel plating is required at the position where the aluminum connecting piece and the screw are connected to increase the connection between the two However, because the aluminum connecting piece needs to be welded to the aluminum pole of the single cell, nickel will affect the connection performance with the aluminum pole; therefore, the place where the aluminum connecting piece is welded to the pole of the single battery cannot be plated with nickel. Therefore, the aluminum connecting piece can only be partially nickel-plated, and the cost of partial nickel-plating is relatively high.

Therefore, the process of connecting the connecting plate, the connecting piece and the bracket with the screw is complicated, the consumables are large, and the cost is high; and the screw and the bracket increase the quality and volume of the battery module, which is not conducive to increasing the volume energy density of the battery module And weight energy density.

In addition, due to the low melting point of aluminum, the thickness of the aluminum connecting sheet is usually thin. If the aluminum sheet is welded directly to the aluminum sheet, the aluminum sheet will be welded through. Therefore, the aluminum sheet and the aluminum sheet cannot be directly welded to the two The aluminum connecting piece is connected.

The present application provides a battery module connection assembly 200, a battery module 100, and a battery pack, which can improve at least one of the above-mentioned problems.

Example

FIG. 2 shows a schematic structural diagram of a battery module 100 provided by an embodiment of the present application. Please refer to FIG. 2. The battery module 100 provided by this embodiment includes 12 single cells 110 and is used to connect two adjacent cells The connection assembly 200 of the battery 110. In the embodiment shown in FIG. 2, the battery module 100 includes two connecting assemblies 200, because two adjacent single cells 110 in the same row can be directly connected through a sheet, and the connecting assembly 200 is mainly used for distance comparison. Connection of the poles 111 of the two distant single cells 110. It is understandable that the number of connection components 200 included in a battery module 100 can be set according to the number of single cells 110 in the battery module 100 and the positional relationship of the single cells 110; The number of connection assemblies 200 is limited, and the present application does not limit the number of single cells 110 included in one battery module 100.

FIG. 3 shows a schematic structural diagram of a connection assembly 200 provided by an embodiment of the present application.

Please refer to FIGS. 2 and 3. In the present application, the connecting assembly 200 includes a first connecting piece 210, a first welding block 220, a connecting plate 230, a second welding block 240, and a second connecting sheet 250.

The connecting assembly 200 is used to connect two adjacent single cells 110. The first connecting piece 210 is connected to the pole 111 of one of the single cells 110, and the second connecting piece 250 is connected to the pole 111 of the other single cell 110. Both the first connecting piece 210 and the second connecting piece 250 are connected to the connecting plate 230.

In detail, the first connecting piece 210 is connected to the connecting plate 230 through the first welding block 220, and opposite ends of the first welding block 220 are respectively welded to the first connecting piece 210 and the connecting plate 230. Correspondingly, the second connecting piece 250 is connected to the connecting plate 230 through the second welding block 240, and the opposite ends of the second welding block 240 are respectively welded to the second connecting piece 250 and the connecting plate 230.

It should be noted that the first welding block 220 and the first welding block 220 do not mean that the shapes of the first welding block 220 and the first welding block 220 can only be cylindrical or elongated. The first welding block 220 and the first welding block 220 can be square blocks, Cylindrical block, ellipsoidal block, hemispherical block, etc.

In this embodiment, the first connecting piece 210 and the second connecting piece 250 are both L-shaped thin plates, and the connecting plate 230 is an elongated thin plate. It should be noted that, in other embodiments of the present application, the first connecting piece 210. The second connecting piece 250 and the connecting plate 230 may have other shapes, and the present application does not limit the shapes of them if the connection relationship is satisfied.

For example, as shown in FIG. 3, the first connecting piece 210 includes a first plate body and a second plate body. The first plate body is suitable for welding 110 with a single battery. The angle, for example, the included angle may be 90°, the second plate body is suitable for being attached to the other side of the single battery 110, and the second plate body is welded to the connecting plate 230. Further, the structure of the second connecting piece 250 is the same as that of the first connecting piece 210. It can be understood that the shape and size of the first connecting piece 210 are the same as the shape and size of the second connecting piece 250.

As an example, in the embodiment of the present application, the materials of the first connecting piece 210, the first welding block 220, the connecting plate 230, the second welding block 240, and the second connecting sheet 250 are all aluminum.

In the embodiment of the present application, the opposite ends of the second welding block 240 are respectively welded to the second connecting piece 250 and the connecting plate 230; the opposite ends of the first welding block 220 are respectively welded to the first connecting piece 210 and the connecting plate 230. welding. The connection assembly 200 may not be provided with screws and a fixing frame for supporting the screws, which reduces the volume while also reducing the weight, which is beneficial to increase the volume energy density and the weight energy density of the battery module 100.

By using the first welding block 220 and the second welding block 240 for welding, the first connecting piece 210, the second connecting piece 250 and the connecting plate 230 can be set as thin plates, reducing the weight and volume of the connecting assembly 200, and at the same time avoiding the first connection. A connecting piece 210 or a second connecting piece 250 is welded through the connecting plate 230. If in order to avoid the problem of welding through due to the direct connection between the first connecting piece 210 and the second connecting piece 250, thicken the first connecting piece 210 and the second connecting piece 250, and the thickening will increase the first connecting piece 210 and the second connecting piece. A resistance of 250 increases power loss. Or, part of the first connecting piece 210 and the second connecting piece 250 is thickened, and the thickness difference between the first connecting piece 210 and the second connecting piece 250 is too large, and thinning treatment is required during the manufacturing process, which will increase the manufacturing cost.

Correspondingly, based on considerations such as price and electrical performance, the connecting plate 230 is usually also made of aluminum. Due to the low melting point of aluminum, the direct welding of the connecting plate 230 with the first connecting piece 210 and the second connecting piece 250 may easily lead to weld penetration. The pole 111 of the single battery 110 is usually aluminum, and the first connecting piece 210 and the second connecting piece 250 are also usually aluminum; in the embodiment of the present application, the second connecting piece 250 and the connecting plate 230 are respectively It is welded with the second welding block 240; the first connecting piece 210 and the connecting plate 230 are respectively welded with the first welding block 220, which can solve the problem of easy welding through.

In the embodiment of the present application, the first welding block 220 and the second welding block 240 are both metal blocks. Further, the first welding block 220 and the second welding block 240 are metal blocks of the same material. In the embodiment, the materials of the first connecting piece 210, the first welding block 220, the connecting plate 230, the second welding block 240, and the second connecting sheet 250 are all aluminum.

It should be noted that in the embodiments of the present application, the materials of the first welding block 220 and the second welding block 240 refer to aluminum materials before welding, and the application does not limit the material of the solder introduced during the welding process.

The welding method of the pole 111 of the single battery 110 and the first connecting piece 210 and the second connecting piece 250 is the welding of aluminum material and the aluminum material, and the second connecting piece 250 and the connecting plate 230 are respectively welded to the second welding block 240. It is the welding of aluminum material and aluminum material, and the welding method of the first connecting piece 210, the connecting plate 230 and the first welding block 220 is the welding of aluminum material and aluminum material; in the process of connecting the two single cells 110, The same welding process and welding parameters (aluminum and aluminum welding parameters) are used to avoid the need to constantly change the welding process and welding parameters during the welding process, simplify the process flow, improve welding efficiency and reduce costs. In addition, compared with other materials such as copper, the cost of aluminum is relatively low, which can further reduce the cost.

It should be noted that, in some embodiments of the present application, the materials of the second solder bump 240, the first solder bump 220, and the connecting plate 230 may also be other metal materials such as copper.

FIG. 4 shows a schematic diagram of the structure of the first connecting piece 210, the first soldering block 220, and the connecting plate 230 provided by an embodiment of the present application. FIG. 5 shows a schematic structural diagram of the first welding block 220 provided by an embodiment of the present application.

Referring to FIGS. 5 and 4, in the embodiment of the present application, the first connecting piece 210 is an L-shaped sheet structure, and one end of the first connecting piece 210 is welded to the pole 111. The other end of the first connecting piece 210 is welded to the first welding block 220.

The first connecting piece 210 is provided with a first connecting hole 211; one end of the first welding block 220 extends into the first connecting hole 211 of the first connecting piece 210 and is welded to the first connecting piece 210.

The connecting plate 230 is a long strip plate, and the connecting plate 230 is provided with a first positioning hole 231 and a second positioning hole 232 at intervals. The first positioning hole 231 is for the other end of the first welding block 220 to extend; then the first welding block 220 is welded to the connecting plate 230.

As an example, all of the aforementioned welding methods may be penetration welding or seam welding.

The welding method of the first welding block 220 with the first connecting piece 210 and the connecting plate 230 adopts the welding method of the hole wall and the wall body. One side) for welding, the inner side of the first connecting piece 210 and the connecting plate 230 does not need to reserve an operable space, which further reduces the length of the first welding block 220 and reduces the volume of the battery module 100. In addition, there is no need to reserve an operable space on the inner side of the first connecting piece 210 and the connecting plate 230, and the first connecting piece 210, the connecting plate 230 and the first soldering block 220 can be brought into surface contact to increase the electrical transmission performance. In addition, the use of the welding method of the hole wall and the wall can increase the connection area of the welding place and increase the electrical transmission performance; further, the welding method of the hole wall and the wall, the contact seam can effectively absorb the laser energy of the welding machine, and the welding machine The power requirement is low, the welding yield is high, the welding strength is high, and the thickness range of the connecting piece is large.

In some embodiments of the present application, two opposite surfaces of the first welding block 220 abut against the first connecting piece 210 and the connecting plate 230 respectively. In other words, after the welding is completed, the first welding block 220 is in surface contact with the first connecting piece 210, and the first welding block 220 is in surface contact with the connecting plate 230; the surface-to-surface abutment can increase the electrical transmission performance.

As an example, in this embodiment, the first welding block 220 includes a bottom 221, a middle column 222, and a top 223 that are sequentially connected; the bottom 221, the middle column 222, and the top 223 are integrally formed.

In this embodiment, the bottom 221 is a square column, the first connecting hole 211 is a square hole that matches the bottom 221, and the bottom 221 can extend into the first connecting hole 211; then, the length of the square hole is welded by seam welding. The hole diameter in the direction is slightly larger than the length of the bottom 221. After the bottom 221 is fitted into the first connecting hole 211, welding is performed along the width direction.

In this embodiment, the entire inner wall of the first connecting hole 211 is welded to the bottom 221; it can be understood that, in some embodiments, part of the inner wall of the first connecting hole 211 is welded to the bottom 221.

In this embodiment, the top 223 is a circular column, and the first positioning hole 231 is a circular hole matching the top 223. The top 223 can extend into the first positioning hole 231 and then welded by penetration welding.

In this embodiment, the entire inner wall of the first positioning hole 231 is welded to the top 223; it can be understood that in some embodiments, part of the inner wall of the first positioning hole 231 is welded to the top 223.

In the embodiment of the present application, the middle column 222 cannot extend into the first positioning hole 231. In other words, the size of the middle column 222 is larger than the first positioning hole 231, so that the middle column 222 has a positioning function and avoids the welding process. The first welding block 220 passes through the first positioning hole 231, which makes it difficult to locate; in addition, the middle column 222 is located outside the first positioning hole 231, and the middle column 222 has a contact surface with the connecting plate 230, adding the first welding block 220 and the connecting plate 230 The contact area, thereby improving the electrical connection performance of the two. Further, in some embodiments of the present application, the two opposite middle pillars 222 abut against the soldering block 220 and the connecting plate 230 respectively, so as to achieve a surface-to-surface contact position relationship and increase electrical transmission performance.

Similarly, in this embodiment, the middle column 222 cannot extend into the first connecting hole 211, so as to prevent the first welding block 220 from passing through the first connecting hole 211 during the welding process, which may cause difficulty in positioning; accordingly, the middle column 222 Located outside the first connecting hole 211, the middle post 222 has a contact surface with the first connecting piece 210, increasing the contact area between the first soldering block 220 and the first connecting piece 210, thereby improving the electrical connection performance of the two; further improving the connecting board 230 and the electrical transmission performance of the first connecting piece 210.

As an example, in this embodiment, the middle column 222 is cylindrical; along the height direction of the first welding block 220, the projections of the bottom 221 and the top 223 are located within the projection of the middle column 222, and the diameter of the middle column 222 is larger than that of the top. The diameter of the 223; the diameter of the middle column 222 is greater than the length of the diagonal of the bottom 221 section.

The cylindrical middle column 222 has an outer circular surface, through which surface contact can be achieved with the connecting plate 230 and the first connecting piece 210.

In this embodiment, along the height direction of the first welding block 220, the projections of the bottom 221 and the top 223 are located in the projection of the middle column 222, which can prevent the first welding block 220 from passing through the first positioning hole 231 and the first connecting hole 211. In addition, it is also possible to make the first welding block 220 have a certain contact area with the connecting plate 230 and the first connecting piece 210 respectively.

It should be noted that in other embodiments of the present application, the first welding block 220 may have other shapes or other structures. For example, the first welding block 220 may have a square column at the top 223 and the bottom 221, and the top 223 and the bottom 221 Both are circular columns, and the top 223 and the bottom 221 are both truncated cones, inverted cones, etc.; the shape of the middle column 222 is not limited to a cylindrical shape. Correspondingly, the first connecting hole 211 and the first positioning hole 231 can also have other shapes; the welding method of the first welding block 220 and the middle column 222 and the connecting plate 230 can also be selected arbitrarily.

It should be noted that, in the embodiment of the present application, the shape and size of the first welding block 220 described above are described when the first welding block 220 is not yet welded, and the shape and size of the first welding block 220 after welding may be changed. There are some changes. Correspondingly, after welding, there may be a change in the shape of the middle column 222. The contact mode with the welding block 220 and the connecting plate 230 is multiple point-to-point contact.

Further, in some embodiments, the surface contact between the middle column 222 and the connecting plate 230 and the first connecting sheet 210 is not necessary, and the first welding block 220 may be electrically connected to the middle column 222 and the connecting plate 230 only through welding points. connect.

In addition, in other embodiments of the present application, the first welding block 220 may also be configured to pass through the first positioning hole 231 and the first connecting hole 211; during the welding process, an auxiliary positioning tool may be used for positioning. Alternatively, the first welding block 220 is configured to pass through the first positioning hole 231 but cannot pass through the first connecting hole 211, which also has a better positioning effect.

In some embodiments of the present application, the first connecting hole 211, the first positioning hole 231, the second positioning hole 232, etc. are not necessary, and the first connecting hole 211, the first positioning hole 231, and the second positioning hole may not be provided. 232. Correspondingly, the first welding block 220 may not be provided with the bottom 221 and the top 223.

Please refer to FIG. 3 again. In the embodiment of the present application, the shape and structure of the second welding block 240 refer to the description of the first welding block 220 described above. The second welding block 240 extends into the second positioning hole 232 and is welded to the connecting plate 230. For the connection manner of the second welding block 240 and the second connecting piece 250, please refer to the description of the first welding block 220 and the first connecting piece 210, which will not be repeated in this embodiment.

The advantages of the connection assembly 200 provided by the embodiment of the present application are:

The opposite ends of the first welding block 220 are respectively welded to the first connecting piece 210 and the connecting plate 230; the opposite ends of the second welding block 240 are respectively welded to the second connecting piece 250 and the connecting plate 230. The volume of the battery module 100 can be reduced while also reducing the weight, which is beneficial to increase the volume energy density and the weight energy density of the battery module 100. The first welding block 220 and the second welding block 240 avoid the problem of welding through between the aluminum plate and the aluminum plate.

For the embodiment where the materials of the first welding block 220, the connecting plate 230, and the second welding block 240 are all aluminum; the welding method of the pole 111 of the single battery 110 and the first connecting sheet 210 and the second connecting sheet 250 And the welding methods of the first welding block 220, the connecting plate 230 and the second welding block 240 are the same, and the same welding process and welding parameters (aluminum and aluminum welding) can be used to avoid changing the welding process during the welding process. And welding parameters, simplify the welding process and reduce the process cost and material cost.

For the embodiment where the two ends of the first welding block 220 respectively extend into the first positioning hole 231 and the first connection hole 211 and then perform welding, the welding process operation space is both outside the first connecting piece 210 and the connecting plate 230; Reducing the length of the first soldering block 220 further reduces the volume of the battery module 100, and at the same time increasing the contact area of the first connecting piece 210, the connecting plate 230 and the first soldering block 220 to increase the electrical transmission performance.

It can be understood that the battery module 100 has all the advantages of the above-mentioned connecting assembly 200, and has a relatively high volume energy density and weight energy density.

The present application also provides a battery pack, which includes a plurality of battery modules 100 connected in series or/and in parallel.

In other words, the battery pack includes a plurality of battery modules 100, and the plurality of battery modules 100 are connected in series; or, the plurality of battery modules 100 are connected in parallel; or, some of the plurality of battery modules 100 are connected through Connected in series, partly connected in parallel.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A connecting assembly for connecting two single batteries, which is characterized in that it comprises:

A first connecting piece, the first connecting piece is electrically connected to one of the single cells;

A second connecting piece, the second connecting piece is electrically connected to another of the single cells;

A connecting plate, one end of the connecting plate is welded and electrically connected to the first connecting piece, and the other end of the connecting plate is welded and electrically connected to the second connecting piece.
The connecting assembly for connecting two single cells according to claim 1, further comprising a first welding block, one end of the connecting plate is connected to the first connecting piece through the first welding block welding.
The connecting assembly for connecting two single cells according to claim 2, wherein one end of the connecting plate has a first positioning hole, the first connecting piece has a first connecting hole, and the second Two ends of a welding block respectively extend into the first positioning hole and the first connecting hole, and the first welding block is respectively welded to the first connecting piece and the connecting plate.
The connection assembly for connecting two single batteries according to claim 3, wherein the wall of the first welding block is welded to the inner wall of the first positioning hole; The wall body is welded to the inner wall of the first connecting hole.
The connection assembly for connecting two single cells according to claim 3, wherein the first soldering block includes a top, a middle, and a bottom connected in sequence, one of the top and the bottom Extends into the first positioning hole, and the other extends into the first connecting hole.
The connecting assembly for connecting two single cells according to claim 5, wherein the top is cylindrical, and the bottom is a square column.
The connecting assembly for connecting two single cells according to claim 5, wherein the two opposite surfaces of the middle portion respectively abut the first connecting piece and the connecting plate.
The connecting assembly for connecting two single cells according to claim 2, wherein the welding method of the first welding block is penetration welding or seam welding.
The connecting assembly for connecting two single batteries according to claim 2, further comprising a second welding block, and the other end of the connecting plate is connected to the second through the second welding block Sheet welding.
The connecting assembly for connecting two single batteries according to claim 9, wherein the other end of the connecting plate has a second positioning hole, the second connecting piece has a second connecting hole, and the Two ends of the second welding block respectively extend into the second positioning hole and the second connecting hole, and the second welding block is respectively welded to the second connecting piece and the connecting plate.
The connection assembly for connecting two single batteries according to claim 10, wherein the wall of the second welding block is welded to the inner wall of the second positioning hole; The wall body is welded to the inner wall of the second connecting hole.
The connection assembly for connecting two single cells according to claim 9, wherein the structure of the second welding block is the same as that of the first welding block.
The connecting assembly for connecting two single cells according to claim 9, wherein the first connecting piece, the second connecting piece, the connecting plate, the first welding block and the The material of the second welding block is aluminum.
The connecting assembly for connecting two single batteries according to claim 1, wherein the first connecting piece comprises:

A first plate body, the first plate body is suitable for welding with the single battery;

The second board has an angle between the second board and the first board, the second board is suitable for being attached to the other side of the single battery, the second board The body is welded to the connecting plate.
The connecting assembly for connecting two single cells according to claim 14, wherein the structure of the second connecting piece is the same as the structure of the first connecting piece.
A battery module, characterized by comprising a plurality of single batteries and a connecting assembly, the connecting assembly being the connecting group for connecting two single batteries according to any one of claims 1-15.
A battery pack, wherein the battery pack comprises a plurality of battery modules according to claim 16 connected in series or/and in parallel.