Single-sided welded battery module

Abstract

The present invention discloses a single-sided welded battery module, including a battery cell holder, a plurality of battery cells and a busbar assembly, wherein each battery cell is placed in the battery cell holder, and each battery cell is hierarchically distributed in the battery cell holder, and is characterized in that: the positive poles of each battery cell are all facing the same direction, the busbar assembly is located at the position where the positive poles of each battery cell are facing, and the busbar assembly and the positive poles of the battery cells, and the busbar assembly and the outer shell of the battery cells are all welded and connected by welding wire. With the single-sided welded battery module used in the present invention, all battery cells face the same direction, which is convenient for assembling the battery cells. At the same time, only one side needs to be welded, which reduces the welding surface and improves work efficiency; the volume of the battery module is reduced, freeing up space, which is convenient for heat dissipation of the negative pole of the battery cell.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of electric vehicle accessories, and in particular to a single-sided welded battery module. Background Art

[0002] Compared with traditional cars, electric cars have obvious advantages in environmental protection. Waste pollution and noise pollution are the two major pollutions of internal combustion engine cars. Electric cars do not consume gasoline, have no exhaust pollution, low noise, and low radiation. They are an ideal clean means of transportation. With the enhancement of human environmental awareness, the application of electric cars is becoming more and more extensive, and the development of battery modules and battery modules for electric cars has become an important topic. Chinese Patent 201720702345.0 discloses a battery module, which is provided with a busbar on the upper side of the upper tray and the lower side of the lower tray. Each battery cell is connected to the upper and lower busbars by aluminum wire welding. When manufacturing this product, it is necessary to weld one side, then turn the battery module over and weld the other side. and It takes a long time to weld the two surfaces. In addition, in order to ensure the safety of the battery module, the busbar and the battery cell are usually kept at a certain distance. The upper and lower busbars are at a certain distance from the upper and lower ends of the battery cell, making the battery module larger and inconvenient to install. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a single-sided welded battery module, which only needs to be welded on one side of the battery module, thereby simplifying the manufacturing steps, improving work efficiency, reducing the volume of the battery module, and utilizing the negative electrode surface of the battery cell to dissipate heat.

[0004] An embodiment of the present invention provides a single-sided welded battery module, comprising a cell holder, a plurality of cell and a busbar assembly, wherein each cell is placed in the cell holder, and each cell is distributed in a hierarchical manner in the cell holder, and is characterized in that: the positive poles of each cell are facing the same direction, the busbar assembly is located at the position where the positive poles of each cell are facing, and the busbar assembly and the positive poles of the cell, and the busbar assembly and the outer shell of the cell are connected by welding wires.

[0005] Optionally, the busbar assembly includes a positive busbar, at least one series busbar and a negative busbar, the positive busbar includes a positive busbar main body and a positive busbar connecting part, the positive busbar main body includes a plurality of long strips distributed in layers, and the positive busbar connecting part is connected to each long strip of the positive busbar main body; the negative busbar includes a negative busbar main body and a negative busbar connecting part, the negative busbar main body includes a plurality of long strips distributed in layers, and the negative busbar connecting part is connected to each long strip of the negative busbar main body; the series busbar includes a series busbar main body and a series busbar connecting part, the series busbar main body includes a plurality of long strips distributed in layers, and the series busbar connecting part is connected to the middle part of each long strip of the series busbar main body, thereby dividing the series busbar into left and right sides.

[0006] Optionally, the negative busbar and the positive busbar are respectively located on both sides of the battery module, and there are multiple series busbars, each of which is arranged in sequence between the positive busbar and the negative busbar, and the battery cells between the negative busbar and the adjacent series busbar, their battery cell shells are all connected to the main part of the negative busbar, and the positive electrodes of the battery cells are all connected to the main part of the adjacent series busbar, the battery cells between the positive busbar and the adjacent series busbar, their positive electrodes are all connected to the main part of the positive busbar, and the battery cell shells are all connected to the main part of the adjacent series busbar, and the battery cells between two series busbars, their positive electrodes and battery cell shells are respectively connected to the corresponding two adjacent series busbar main parts.

[0007] Optionally, the negative busbar and the positive busbar are respectively located on both sides of the battery module, and one of the series busbars is provided, and the series busbar is located between the positive busbar and the negative busbar, one side of the series busbar is adjacent to the negative busbar, and the other side of the series busbar is adjacent to the positive busbar, the battery cell between the positive busbar and the series busbar, its battery cell positive electrode is connected to the main part of the positive busbar, and the battery cell shell is connected to one side of the main part of the series busbar, the battery cell between the negative busbar and the series busbar, its battery cell shell is connected to the negative busbar, and the positive electrode of the battery cell is connected to the other side of the main part of the series busbar.

[0008] Optionally, the busbar assembly includes a positive busbar and a negative busbar, the positive busbar includes a positive busbar main part and a positive busbar connecting part, the positive busbar main part includes a plurality of long strips distributed in layers, and the positive busbar connecting part is connected to each long strip of the positive busbar main part; the negative busbar includes a negative busbar main part and a negative busbar connecting part, the negative busbar main part includes a plurality of long strips distributed in layers, and the negative busbar connecting part is connected to each long strip of the negative busbar main part, the positive electrode of the battery cell is connected to the positive busbar main part, and the battery cell casing is connected to the negative busbar main part.

[0009] Optionally, the long strips of the main part of the negative busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction, the long strips of the main part of the series busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction, and the long strips of the main part of the positive busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction.

[0010] Optionally, insulating parts are provided between the end of the main part of the negative busbar and the connecting part of the adjacent series busbar, between the connecting part of the negative busbar and the end of the main part of the adjacent series busbar, between the end of the main part of the series busbar and the connecting part of the adjacent series busbar, between the end of the main part of the positive busbar and the connecting part of the adjacent series busbar, and between the connecting part of the positive busbar and the end of the main part of the adjacent series busbar.

[0011] Optionally, the negative busbar connecting part and the positive busbar connecting part are both fixedly connected to the frame of the battery cell holder, the battery cell holder is provided with a plurality of mounting holes, the positive busbar, the negative busbar and the series busbar are all provided with mounting holes, the mounting holes on each busbar correspond to the positions of the mounting holes of the battery cell holder, and the mounting holes on each busbar are fixedly connected to the mounting holes of the battery cell holder through fixings.

[0012] Optionally, the connecting portion of the series busbars is bent.

[0013] Optionally, the negative electrode surface of each of the battery cells is attached to a heat dissipation surface.

[0014] The essential features and significant technical advances of the present invention are as follows: (1) With the single-sided welded battery module used in the present invention, all battery cells are oriented in the same direction, which facilitates the assembly of the battery cells and eliminates the need for installing some battery cells upright and some battery cells in reverse order to achieve series-parallel connection in the traditional battery module; (2) the present invention only requires welding on one side, which reduces the welding surface and improves work efficiency; (3) the negative electrode of the battery of the present invention is no longer provided with a busbar, which reduces the volume of the battery module, frees up space, and can use the negative electrode surface of the battery cell for heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the battery module structure;

[0016] Figure 2 is a schematic diagram of the busbar and the battery cell in the first embodiment;

[0017] Figure 3 It is a schematic diagram of the negative busbar;

[0018] Figure 4 is a schematic diagram of the first series busbar;

[0019] Figure 5 is a schematic diagram of the second series busbar;

[0020] Figure 6 It is a schematic diagram of the positive busbar;

[0021] Figure 7 It is a specific schematic diagram of welding the battery cell and the busbar;

[0022] Figure 8 This is a schematic diagram of the distribution of each busbar in Example 3.

[0023] Explanation of the accompanying drawings: 1. Battery cell bracket; 2. Battery cell; 3. Negative busbar; 31. Main part of negative busbar; 32. Connecting part of negative busbar; 4. First series busbar; 41. Main part of first series busbar; 42. Connecting part of first series busbar; 5. Second series busbar; 51. Main part of second series busbar; 52. Connecting part of second series busbar; 6. Positive busbar; 61. Main part of positive busbar; 62. Connecting part of positive busbar; 7. Insulating member; 8. Fixing member. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. The single-sided welded battery module cell holder 1, multiple cells 2 and busbar assembly of the present invention, each cell 2 is placed in the cell holder 1, and the positive poles of each cell 2 are facing the same direction, the busbar assembly is fixedly connected to the cell holder 1, and the busbar assembly is located at the position where the positive poles of each cell 2 are facing. Figure 7As shown, the principle of the present invention is as follows: according to the characteristics of the battery cell 2, the negative electrode of the battery cell 2 is connected to the outer shell, and the busbar assemblies are all installed in the direction of the positive electrode of the battery cell 2. For the busbar in the busbar assembly that originally needs to be welded to the negative electrode of the battery cell 2, it is connected to the outer shell of the battery cell 2 through a welding wire.

[0025] Example 1

[0026] like Figure 1-7 As shown, the battery module includes a cell holder 1, multiple cells 2 and a busbar assembly, each cell 2 is placed in the cell holder 1, and the positive pole of each cell 2 faces upward, the busbar assembly is fixedly connected to the cell holder 1, and the busbar assemblies are all located on the side where the positive pole of the cell 2 is located, the busbar assembly includes a positive busbar 6, a first series busbar 4, a second series busbar 5 and a negative busbar 3, the positive busbar 6 includes a positive busbar main part 61 and a positive busbar connecting part 62, the positive busbar main part 61 is composed of multiple long strips, each of which is distributed in multiple layers, the positive busbar connecting part 62 is connected to the edges of each long strip of the positive busbar main part 61 to form a complete positive busbar. The negative busbar 3 includes a negative busbar main body 31 and a negative busbar connecting part 32. The negative busbar main body 31 is composed of a plurality of long strips, each of which is distributed in multiple layers. The negative busbar connecting part 32 is connected to the edge of each long strip in each negative busbar main body 31 to form a complete negative busbar. The first series busbar 4 includes a first series busbar main body 41 and a first series busbar connecting part 42. The first series busbar main body 41 is composed of a plurality of long strips, each of which is distributed in multiple layers. The first series busbar connecting part 42 is connected to the middle part of each long strip in the first series busbar main body 41, thereby dividing the first series busbar main body 41 into two left and right parts. Specifically, the first series busbar connecting part 42 is bent. The second series busbar 5 includes a second series busbar main body 51 and a second series busbar connecting part 52. The second series busbar main body 51 is composed of a plurality of long strips, each of which is distributed in multiple layers. The second series busbar connecting part 52 is connected to the middle part of each of the long strips of the second series busbar main body 51, thereby dividing the second series busbar main body 51 into two parts on the left and right. Specifically, the second series busbar connecting part 52 is bent. The negative busbar 3 and the positive busbar 6 are distributed at both ends, and the first series busbar and the second series busbar are located between the negative busbar 3 and the positive busbar 6. Specifically, one side of the first series busbar 4 is adjacent to the negative busbar 3, and one side of the second series busbar 5 is adjacent to the positive busbar 6, and the other side of the first series busbar 4 is adjacent to the other side of the second series busbar 5.

[0027] like Figure 1 and Figure 2 As shown, each battery cell 2 is divided into three parts, according to Figure 1 From the perspective of the embodiment, the tail portion is from the negative busbar connection part 32 to the left side of the first series busbar connection part 42, the middle portion is from the right side of the first series busbar connection part 42 to the left side of the second series busbar connection part 52, and the head portion is from the right side of the second series busbar connection part 52 to the side of the positive busbar connection part 62. The outer shells of the battery cells 2 in the tail portion are all welded to the main part 31 of the negative busbar by welding wires, and the positive electrodes of the battery cells 2 in the tail portion are welded to the left part of the main part 41 of the first series busbar by welding wires. The outer shells of the battery cells 2 in the middle portion are all welded to the right part of the main part 41 of the first series busbar by welding wires, the positive electrodes of the battery cells 2 in the middle portion are all welded to the left part of the main part 51 of the second series busbar by welding wires, the outer shells of the battery cells 2 in the head portion are all welded to the right part of the main part 51 of the second series busbar by welding wires, and the positive electrodes of the battery cells 2 in the head portion are all welded to the main part 61 of the positive busbar by welding wires.

[0028] like Figure 1 and Figure 2 As shown, each battery cell 2 is provided with multiple layers in the battery cell holder, and the long strip plates of the main part 31 of the negative busbar and the long strip plates on the left side of the main part 41 of the first series busbar are staggered along the battery cell level arrangement direction, the long strip plates on the right side of the main part 41 of the first series busbar and the long strip plates on the left side of the main part 51 of the second series busbar are staggered along the battery cell level arrangement direction, and the long strip plates on the right side of the main part 51 of the second series busbar and the long strip plates of the main part 61 of the positive busbar are staggered along the battery cell level arrangement direction. Insulating parts 7 are provided between the end of the main part 31 of the negative busbar and the adjacent first series busbar connecting part 42, between the connecting part 32 of the negative busbar and the end of the adjacent first series busbar main part 41, between the end of the first series busbar main part 41 and the adjacent second series busbar connecting part 52, between the first series busbar connecting part 42 and the adjacent second series busbar main part 51, between the end of the main part 61 of the positive busbar and the adjacent second series busbar connecting part 52, and between the connecting part 62 of the positive busbar and the end of the adjacent second series busbar main part 51 to prevent electrical conduction of the individual busbars.

[0029] The following installation methods can be used for each manifold in the manifold group. For details, please refer to Figure 1 and Figure 2The negative busbar connection part 32 and the positive busbar connection part 62 are both fixedly connected to the frame of the battery module cell holder 1 by screws. The cell holder 1 is provided with a plurality of mounting holes, and each busbar is also provided with mounting holes. The mounting holes on each busbar correspond to the mounting holes on the cell holder, and are fixedly connected by the fixing member 8. The fixing member 8 is preferably a screw or a tree-shaped snap.

[0030] Specifically, the first part, the second part and the third part of the battery cell 2 each include 19 battery cells, and according to the above connection method, a battery module with 19 parallel and 3 series can be formed. It should be noted here that the use of two series busbars in the above scheme is only a preferred scheme. In order to realize a battery module with a structure of 19 parallel and 3 series of battery cells, two series busbars are needed. If 4 groups of battery cells need to be connected in series, 3 series busbars are needed. Specifically, each battery cell can be arranged according to the required voltage and current requirements of the battery module to form different series-parallel combinations, so as to set the busbar group according to the needs. The specific setting method of the busbar group can be referred to the above embodiment 1 for analogy, and will not be repeated here. Of course, according to actual needs, two groups of battery cells can also be connected in series, and only one series busbar needs to be set. For details, please refer to embodiment 2, or if the battery cells are not required to be connected in series, there is no need to set a series busbar, and for details, please refer to embodiment 3.

[0031] Example 2

[0032] The battery cells 2 are divided into two groups. The busbar assembly includes a positive busbar, a negative busbar and a series busbar. One side of the series busbar is adjacent to the negative busbar, and the other side of the series busbar is adjacent to the positive busbar. Among the two groups of battery cells, the positive electrode of one group of battery cells is welded to the main part of the positive busbar through a welding wire, and the outer shell of this group of battery cells is welded to one side of the main part of the series busbar through a welding wire. The outer shell of the other group of battery cells is welded to the negative busbar through a welding wire, and the positive electrode of the other group of battery cells is welded to the other side of the main part of the series busbar through a welding wire.

[0033] Example 3

[0034] like Figure 8As shown, if in the battery module, it is only necessary to connect the battery cells 2 in parallel and there is no need to connect the battery cells in series, therefore only the positive busbar 3 and the negative busbar 4 are included, the positive busbar 6 includes a positive busbar main body 61 and a positive busbar connecting part 62, the positive busbar main body 61 is composed of a plurality of long strips, each of which is distributed in multiple layers, the positive busbar connecting part 62 is connected to the edges of each of the long strips of the positive busbar main body 61 to form a complete positive busbar. The negative busbar 3 includes a negative busbar main body 31 and a negative busbar connecting part 32. The negative busbar main body 31 is composed of a plurality of long strips, each of which is distributed in multiple layers. The negative busbar connecting part 32 is connected to the edge of each long strip in each negative busbar main body 31 to form a complete negative busbar. The outer shell of the battery cell 2 is welded to the negative busbar main body 31 by welding wire, and the positive electrode of the battery cell 2 is welded to the positive busbar main body 61 by welding wire. The long strips of the negative busbar main body 31 and the long strips of the positive busbar main body 61 are staggered along the battery cell hierarchical arrangement direction.

[0035] It can be seen from the above description that, in the battery module with single-sided welding used in the present invention, all the cells are oriented in the same direction, which is convenient for assembling the cells, eliminating the steps of installing some cells in the right direction and some cells in the reverse direction in order to achieve series-parallel connection in the traditional battery module, and only one surface of the battery module needs to be welded, which reduces the welding surface and improves work efficiency. In addition, the negative electrode of the battery of the present invention is no longer provided with a busbar, which reduces the volume of the battery module and frees up space. Due to the characteristics of the battery cell, the temperature of the negative electrode of the battery cell is relatively high, so the negative electrode of the battery frees up space for the installation of a heat dissipation device. Preferably, the negative electrode surface of each battery cell 2 is attached to a heat dissipation surface, and the heat dissipation surface is made of thermal conductive adhesive.

[0036] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A single-sided welded battery module, comprising a cell holder, a plurality of cells and a busbar assembly, wherein each cell is placed in the cell holder, and each cell is hierarchically distributed in the cell holder, characterized in that: The positive electrodes of each battery cell are all facing the same direction, the busbar assembly is located at the position where the positive electrodes of each battery cell are facing, the busbar assembly and the positive electrodes of the battery cells, and the busbar assembly and the outer shell of the battery cells are connected by welding wires, the busbar assembly includes a positive busbar, at least one series busbar and a negative busbar, the positive busbar includes a positive busbar main body and a positive busbar connecting part, the positive busbar main body includes a plurality of hierarchically distributed long strips, the positive busbar connecting part is connected to each long strip of the positive busbar main body; the negative busbar It includes a negative busbar main body and a negative busbar connecting part, the negative busbar main body includes a plurality of long strips distributed in layers, and the negative busbar connecting part is connected to each long strip in each negative busbar main body; the series busbar includes a series busbar main body and a series busbar connecting part, the series busbar main body includes a plurality of long strips distributed in layers, and the series busbar connecting part is connected to the middle part of each long strip in the series busbar main body, thereby dividing the series busbar into left and right sides, and the negative electrode surface of each battery cell is attached to a heat dissipation surface.

2. The single-sided welded battery module according to claim 1, characterized in that: The negative busbar and the positive busbar are respectively located on both sides of the battery module. There are multiple series busbars, and each series busbar is arranged in sequence between the positive busbar and the negative busbar. The battery cells between the negative busbar and the adjacent series busbar have their battery cell shells connected to the main part of the negative busbar, and the positive electrodes of the battery cells are connected to the main part of the adjacent series busbar. The battery cells between the positive busbar and the adjacent series busbar have their positive electrodes connected to the main part of the positive busbar, and the battery cell shells are connected to the main part of the adjacent series busbar. The battery cells between two series busbars have their positive electrodes and battery cell shells respectively connected to the corresponding two adjacent series busbar main parts.

3. The single-sided welded battery module according to claim 1, characterized in that: The negative busbar and the positive busbar are respectively located on both sides of the battery module, and one of the series busbars is provided, and the series busbar is located between the positive busbar and the negative busbar, one side of the series busbar is adjacent to the negative busbar, and the other side of the series busbar is adjacent to the positive busbar. The battery cell between the positive busbar and the series busbar has its positive electrode connected to the main part of the positive busbar, and the battery cell shell is connected to one side of the main part of the series busbar. The battery cell between the negative busbar and the series busbar has its battery cell shell connected to the negative busbar, and the positive electrode of the battery cell is connected to the other side of the main part of the series busbar.

4. The single-sided welded battery module according to claim 2, characterized in that: The long strips of the main part of the negative busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction, the long strips of the main part of the series busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction, and the long strips of the main part of the positive busbar are staggered with the long strips of the main part of the adjacent series busbar along the cell level arrangement direction.

5. The single-sided welded battery module according to claim 4, characterized in that: Insulating parts are provided between the end of the main part of the negative busbar and the connecting part of the adjacent series busbar, between the connecting part of the negative busbar and the end of the main part of the adjacent series busbar, between the end of the main part of the series busbar and the connecting part of the adjacent series busbar, between the end of the main part of the positive busbar and the connecting part of the adjacent series busbar, and between the connecting part of the positive busbar and the end of the main part of the adjacent series busbar.

6. The single-sided welded battery module according to claim 1, characterized in that: The negative busbar connecting part and the positive busbar connecting part are both fixedly connected to the frame of the battery cell holder. The battery cell holder is provided with a plurality of mounting holes. The positive busbar, the negative busbar and the series busbar are all provided with mounting holes. The mounting holes on each busbar correspond to the positions of the mounting holes of the battery cell holder, and the mounting holes on each busbar are fixedly connected to the mounting holes of the battery cell holder through fixings.

7. The single-sided welded battery module according to claim 1, characterized in that: The connecting portion of the series busbars is bent.

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