Cylindrical battery module

Abstract

The utility model provides a cylindrical battery module, which comprises a plurality of battery cell groups connected in series, each battery cell group comprises a plurality of cylindrical battery cells connected in parallel, and the plurality of cylindrical battery cells of each battery cell group are arranged side by side along the length direction of the module. The plurality of cylindrical battery cells of each battery cell group are arranged in parallel along the width direction of the module; a plurality of rows of battery cell groups and a plurality of columns of battery cell groups are arranged along the length direction of the module, each row of battery cell groups comprises a plurality of battery cell groups which are arranged side by side along the length direction of the module, and each column of battery cell groups comprises a plurality of battery cell groups which are arranged side by side along the width direction of the module.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a cylindrical battery module. Background Art

[0002] The cylindrical battery module consists of multiple battery packs connected in series, and each battery pack consists of multiple cylindrical batteries connected in parallel. Figure 1 In the conventional solution, the multiple cylindrical cells of the cell group 10 are arranged side by side along the width direction of the module, and several rows of cell groups 10 can be arranged along the length direction of the module. Therefore, only an integer multiple of the cell groups 10 can be arranged in the width direction of the module. For the battery envelope, especially the battery envelope of CTC, the battery system generally has several cylindrical battery modules, the length direction of the module corresponds to the length direction of the whole vehicle, and the width direction of the module corresponds to the width direction of the whole vehicle. Obviously, in the battery space envelope, the width direction is very compact and tight, because only an integer multiple of battery cell groups can be arranged in the width direction of the module, and the size in the width direction is limited by the number of parallel battery cells. For example, a battery cell group includes 5 parallel cylindrical battery cells, and the width direction of the module can only be arranged as an integer multiple of 5 battery cells. If the width direction dimension of the battery system envelope is not an integer multiple of 5 battery cells, such as the width direction of the battery system envelope has space for arranging 7 cylindrical battery cells, but because the cylindrical battery cells are arranged in groups, the space can only be arranged for 5 cylindrical battery cells, thereby wasting the space for two cylindrical battery cells, resulting in serious waste of the battery system width direction envelope. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a cylindrical battery module, including a plurality of battery cell groups connected in series, each of the battery cell groups including a plurality of cylindrical battery cells connected in parallel, the plurality of cylindrical battery cells in each of the battery cell groups are arranged side by side along the length direction of the module, and the plurality of cylindrical battery cells in each of the battery cell groups are arranged side by side along the width direction of the module; a plurality of rows of battery cell groups and a plurality of columns of battery cell groups are arranged along the length direction of the module, each row of battery cell groups includes a plurality of battery cell groups arranged side by side along the length direction of the module, and each column of battery cell groups includes a plurality of battery cell groups arranged side by side along the width direction of the module.

[0004] Preferably, each of the battery cell groups further comprises a positive bus and a negative bus, the positive electrodes of the plurality of cylindrical battery cells in the battery cell group are connected in parallel via the positive bus, and the negative electrodes of the plurality of cylindrical battery cells in the battery cell group are connected in parallel via the negative bus;

[0005] In the same column of cell groups arranged along the length direction of the module, two adjacent cell groups are connected in series by connecting the positive electrode bus of one cell group to the negative electrode bus of the other cell group;

[0006] In two adjacent columns of cell groups arranged along the length direction of the module, two adjacent cell groups in the first row or the last row are connected in series via the positive electrode bus of one of the cell groups and the negative electrode bus of the other cell group.

[0007] Preferably, the positive busbar comprises a positive busbar main body and a plurality of positive electrode welding branches integrally and spaced apart on one side of the positive busbar main body, and the positive busbar main body is located on one side of the battery cell group; each of the positive electrode welding branches is respectively welded to the positive electrode of one of the cylindrical battery cells.

[0008] Preferably, the positive electrode and negative electrode of the cylindrical battery cell are concentrically arranged at the same end of the cylindrical battery cell, the negative electrode is located at the end surface of the cylindrical battery cell, the positive electrode is a cylindrical structure protruding from the negative electrode, and the radius of the positive electrode is smaller than the radius of the negative electrode.

[0009] Preferably, the end of the positive electrode welding branch is an arc structure, the arc structure is stacked above the positive electrode of the cylindrical battery cell, and the arc structure is concentric with the positive electrode of the cylindrical battery cell and has the same radius.

[0010] Preferably, the negative busbar comprises a negative busbar main body and a plurality of negative electrode welding branches integrally and spaced apart on one side of the negative busbar main body, and the negative busbar main body is located on one side of the battery cell group; each of the negative electrode welding branches is respectively welded to the negative electrode of one of the cylindrical battery cells.

[0011] Preferably, the negative electrode welding branch is a crescent-shaped structure, which includes an inner arc and an outer arc that are integrally arranged and concentric with the cylindrical battery cell, the outer arc is integrally connected to the negative electrode bus body, the radius of the inner arc is larger than the radius of the positive electrode, and the radius of the outer arc is not larger than the radius of the negative electrode.

[0012] Preferably, the negative electrode welding branch is lower than the negative electrode busbar body, and the thickness of the negative electrode welding branch is the height difference between the positive electrode cylindrical end face and the negative electrode cylindrical end face of the cylindrical battery cell.

[0013] Preferably, in the same column of cell groups arranged along the length direction of the module, the positive bus body of the positive bus of one of the two adjacent cell groups is integrally connected to the negative bus body of the negative bus of the other cell group at the side to form an intermediate series bus.

[0014] Preferably, in two adjacent columns of battery cell groups arranged along the length direction of the module, the positive bus body of the positive bus of one of the two adjacent battery cell groups in the first row or the last row and the negative bus body of the negative bus of the other battery cell group are integrally connected at the end surface to form a side series bus.

[0015] Preferably, a weakening structure is provided at the connection between the positive busbar body and the negative busbar body of the side series busbar.

[0016] Preferably, an even number of rows of cell groups are arranged along the length direction of the module, the positive bus outside the first cell group in the first row of cell groups arranged along the length direction of the module is the total positive bus, and the negative bus outside the last cell group in the first row of cell groups is the total negative bus.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] In the traditional solution, multiple cylindrical cells of the cell group are arranged side by side along the width direction of the module, and several columns of cell groups can be arranged along the length direction of the module. Therefore, only an integer multiple of cell groups can be arranged in the width direction of the module, resulting in serious waste of the envelope in the width direction of the battery system. In the utility model, multiple cylindrical cells of the cell group are arranged side by side along the length direction of the module. Therefore, any number of columns of cell groups can be arranged in the width direction of the module, that is, the width direction of the module can be fully utilized, and thus the envelope in the width direction of the battery system can be fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic diagram of the arrangement of the battery cell group in the cylindrical battery module of the traditional solution;

[0021] Figure 2 It is a schematic diagram of the arrangement of the battery cell group in the cylindrical battery module provided by the utility model;

[0022] Figure 3 It is a structural schematic diagram of a cylindrical battery module provided by the utility model;

[0023] Figure 4 This is a disassembly diagram of a cylindrical battery module provided by the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the total negative bus provided by the utility model Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the structure of the total negative bus provided by the utility model Figure 2 ;

[0026] Figure 7 It is a structural schematic diagram of the intermediate series bus provided by the utility model;

[0027] Figure 8 It is a structural schematic diagram of the side series bus provided by the utility model;

[0028] Fig. 9 It is a structural schematic diagram of the total positive busbar provided by the utility model; DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Please refer to Figures 2 to 4 , this embodiment provides a cylindrical battery module, including a plurality of battery cell groups 10 connected in series, each battery cell group 10 includes a plurality of cylindrical battery cells 101 connected in parallel, and the plurality of cylindrical battery cells 101 of each battery cell group 10 are arranged side by side along the length direction of the module. Several rows of battery cell groups and several columns of battery cell groups are arranged along the length direction of the module, each row of battery cell groups includes a plurality of battery cell groups 10 arranged side by side along the length direction of the module, and each column of battery cell groups includes a plurality of battery cell groups 10 arranged side by side along the width direction of the module. In this embodiment, the plurality of cylindrical battery cells 101 of each battery cell group 10 are arranged side by side along the length direction of the module, and the plurality of cylindrical battery cells 101 of each battery cell group 10 are arranged side by side along the width direction of the module. For example, if a battery cell group includes 5 parallel cylindrical battery cells 101, then an integer multiple of 5 cylindrical battery cells 101 can be arranged side by side along the length direction of the module, and an integer multiple of 1 cylindrical battery cell 101 can be arranged side by side along the width direction of the module. That is, the width direction of the module can be fully utilized, and battery cell groups of any number of columns can be arranged, thereby making full use of the envelope of the battery system in the width direction.

[0031] According to the requirements, it is necessary to design a cylindrical battery module with 5 parallel (i.e., one battery cell group 10 includes 5 parallel cylindrical battery cells 101). According to the given battery system envelope, 6 parallel cylindrical battery cells 101 can be accommodated in the width direction, and 30 parallel cylindrical battery cells 101 can be accommodated in the length direction.

[0032] According to the traditional scheme, only 5 cylindrical battery cells can be arranged side by side in the width direction of the module (the width direction of the module in the traditional scheme can only arrange an integer multiple of 5 cylindrical battery cells side by side, that is, only 5 cylindrical battery cells can be arranged), and 30 cylindrical battery cells can be arranged side by side in the length direction of the module, that is, 5 rows of cylindrical battery cells can be set along the length direction of the module, and each row has 30 cylindrical battery cells, then the module has a total of 5×30=150 battery cells.

[0033] In this embodiment, six cylindrical battery cells 101 can be arranged side by side in the width direction of the module (actually, any number of cylindrical battery cells 101 can be arranged side by side according to the battery system envelope), and 30 cylindrical battery cells 101 can be arranged side by side in the length direction of the module, that is, six rows of cylindrical battery cells can be set along the length direction of the module, with 30 cylindrical battery cells in each row, and the module has a total of 6×30=180 battery cells, which increases the power consumption by 20% compared with the traditional solution.

[0034] In the traditional solution, the electrical connection structure of the cylindrical battery module is generally first welded with aluminum wire or nickel sheet and the battery cell group is connected to the bus, and then the bus is used to connect the battery cell groups in series. The entire bus assembly is complex and the welding workload is large. At the same time, the aluminum wire or nickel sheet is generally used as a fuse at the same time, there is a problem of poor balance between overcurrent capacity and protection effect, and the fuse arrangement is not flexible.

[0035] In this embodiment, the electrical connection structure does not need to use aluminum wires or nickel sheets, and the parallel connection of multiple cylindrical cells in a cell group and the series connection between cell groups can be achieved through the structure of the busbar itself.

[0036] Specifically, each battery cell group 10 further includes a positive bus and a negative bus, the positive electrodes 1011 of the multiple cylindrical battery cells 101 of the battery cell group 10 are connected in parallel via the positive bus, and the negative electrodes 1012 of the multiple cylindrical battery cells 101 of the battery cell group 10 are connected in parallel via the negative bus.

[0037] The positive electrode 1011 and the negative electrode 1012 of the cylindrical battery cell 101 are concentrically arranged at the same end of the cylindrical battery cell 101 , and the negative electrode 1012 is located at the end surface of the cylindrical battery cell 101 . The positive electrode 1011 is a cylindrical structure protruding from the negative electrode 1012 , and the radius of the positive electrode 1011 is smaller than the radius of the negative electrode 1012 .

[0038] In the same column of cell groups arranged along the length direction of the module, two adjacent cell groups 10 are connected in series by connecting the positive bus of one cell group 10 to the negative bus of the other cell group 10, that is, the positive bus of one cell group 10 and the negative bus of the other cell group 10 of the two adjacent cell groups 10 are connected as a whole to form an intermediate series bus 30.

[0039] In two adjacent columns of battery cell groups arranged along the length direction of the module, two adjacent battery cell groups 10 in the first row or the last row are connected in series by connecting the positive bus of one battery cell group 10 and the negative bus of the other battery cell group 10, and the positive bus of one battery cell group 10 and the negative bus of the other battery cell group 10 are integrally connected to form a side series bus 40.

[0040] The present invention does not restrict whether an even number of columns or an odd number of columns of battery cell groups are arranged along the length direction of the module. This embodiment preferably arranges an even number of columns of battery cell groups along the length direction of the module, in order to ensure that the total positive output pole and the total negative output pole of the module are located at the two ends of the same side in the length direction of the module.

[0041] The utility model does not specifically limit how many rows of battery cell groups, how many columns of battery cell groups, and how many cylindrical battery cells 101 each battery cell group has, and can be set according to the size of the actual battery system envelope. This embodiment takes a battery cell group including 5 parallel cylindrical battery cells 101, and 6 rows of battery cell groups and 6 columns of battery cell groups are set along the length direction of the module as an example to describe the electrical connection structure of the lower module in detail.

[0042] The electrical connection structure of this embodiment includes a total negative bus 20, a plurality of intermediate series bus 30, a plurality of side series bus 40 and a total positive bus 50. In the first row of battery cell groups arranged along the length direction of the module, there are a total of six battery cell groups 10 from left to right. The total negative bus 20 is connected to the negative electrodes 1012 of the five cylindrical battery cells 101 of the first battery cell group 10, and the total positive bus 50 is connected to the positive electrodes 1011 of the five cylindrical battery cells 101 of the last battery cell group 10.

[0043] Please refer to Figure 5 and Figure 6 The total negative electrode busbar 20 is a metal stamping sheet metal structure, which includes a total negative electrode busbar body 202 and five total negative electrode welding branches 201 integrally arranged at intervals on one side of the total negative electrode busbar body 202. The total negative electrode busbar body 202 is located outside the first battery cell group 10. Each total negative electrode welding branch 201 is welded to the negative electrode 1012 of the corresponding cylindrical battery cell 101 of the first battery cell group 10.

[0044] The total negative electrode welding branch 201 is a crescent-shaped structure, which includes a total inner arc 2011 and a total outer arc 2012 that are integrally arranged and concentric with the cylindrical battery cell 101. The total outer arc 2012 is integrally connected to the total negative electrode busbar body 202. The radius of the total inner arc 2011 is greater than the radius of the positive electrode 1011 to reserve an electrical gap. The radius of the total outer arc 2012 is not greater than the radius of the negative electrode 1012.

[0045] The total negative electrode welding branch 201 is lower than the total negative electrode busbar body 202 , and the thickness of the total negative electrode welding branch 201 is the height difference between the cylindrical end surface of the positive electrode 1011 and the cylindrical end surface of the negative electrode 1012 of the cylindrical battery cell 101 .

[0046] A first flange structure 204 is also provided on the main body 202 of the total negative electrode busbar. The first flange structure 204 and the total negative electrode welding branch 201 are respectively located on both sides of the main body 202 of the total negative electrode busbar. The first flange structure 204 is at right angles to the total negative electrode welding branch 201, and is mainly used to reduce the width of the module. In addition, after the sheet metal of the total negative electrode busbar 20 is unfolded, its cross-sectional height gradually increases from right to left, mainly because the current carrying capacity gradually increases from right to left. This design effectively reduces the weight and cost of the total negative electrode busbar 20. At the same time, a mounting hole 203, such as a circular mounting hole, is provided at the left end of the main body 202 of the total negative electrode busbar, which is used for connecting and fixing the busbar or high-voltage wiring harness between other modules when the negative electrode is led out.

[0047] Please refer to Figure 7 The intermediate series bus 30 is used to connect two adjacent battery cell groups 10 in the same column of battery cell groups arranged along the length direction of the module, and includes an intermediate positive bus 301 and an intermediate negative bus 302 that are integrally arranged. The intermediate positive bus 301 is connected to one of the battery cell groups 10, and the intermediate negative bus 302 is connected to another adjacent battery cell group 10. Specifically, the intermediate positive bus 301 includes an intermediate positive bus body 3012 and a plurality of intermediate positive electrode welding branches 3011 that are integrally arranged at intervals on one side of the intermediate positive bus body 3012, and each intermediate positive electrode welding branch 3011 is respectively welded to the positive electrode 1011 of the cylindrical battery cell 101 of a battery cell group 10.

[0048] The intermediate negative electrode busbar 302 includes an intermediate negative electrode busbar body 3022 and five intermediate negative electrode welding branches 3021 integrally and spaced apart on one side of the intermediate negative electrode busbar body 3022 , each intermediate negative electrode welding branch 3021 being respectively welded to the negative electrode 1012 of the cylindrical battery cell 101 of another adjacent battery cell group 10 .

[0049] The middle positive busbar body 3012 and the middle negative busbar body 3022 are integrally connected at the side.

[0050] The middle positive electrode welding branch 3011 is a short strip structure, and its end is an arc structure. The arc structure is stacked above the positive electrode 1011 of the cylindrical battery cell 101, and the arc structure is concentric with the positive electrode 1011 of the cylindrical battery cell 101 and has the same radius.

[0051] The middle negative electrode welding branch 3021 is a crescent-shaped structure, which includes a middle inner arc 30211 and a middle outer arc 30212 which are integrally arranged and concentric with the cylindrical battery cell 101, and the middle outer arc 30212 is integrally connected with the middle negative electrode busbar body 3022, and the radius of the middle inner arc 30211 is greater than the radius of the positive electrode 1011 to reserve an electrical gap. The radius of the middle outer arc 30212 is not greater than the radius of the negative electrode 1012.

[0052] The middle series busbar 30 is a metal stamping sheet metal structure. The middle negative electrode welding branch 3021 and the middle positive electrode welding branch 3011 have a stamping drop. The stamping depth is equal to the height difference between the cylindrical end faces of the positive electrode 1011 and the negative electrode 1012 of the cylindrical battery cell 101.

[0053] Please refer to Figure 8 The side series bus 40 is used to connect the two adjacent battery cell groups 10 in the first row or the last row of two adjacent columns of battery cell groups arranged along the length direction of the module. For example, the two battery cell groups 10 in the first column and the last row of the second column in this embodiment are connected by the side series bus 40, and the two battery cell groups 10 in the first row of the second column and the third column are connected by the side series bus 40.

[0054] The side series bus 40 includes a side positive bus 401 and a side negative bus 402. Specifically, the side positive bus 401 includes a side positive bus body 4012 and a plurality of side positive welding branches 4011 integrally and spaced apart on one side of the side positive bus body 4012. Each side positive welding branch 4011 is respectively welded to the positive electrode 1011 of a cylindrical battery cell 101 of a battery cell group 10.

[0055] The side negative electrode busbar 402 includes a side negative electrode busbar body 4021 and five side negative electrode welding branches 4022 integrally and spaced apart on one side of the side negative electrode busbar body 4021 , each side negative electrode welding branch 4022 is welded to the negative electrode 1012 of the cylindrical battery cell 101 of another adjacent battery cell group 10 .

[0056] The side positive busbar body 4012 and the side negative busbar body 4021 are integrally connected at the end surface to form the side series busbar 40 body.

[0057] The side positive electrode welding branch 4011 is a short strip structure, and its end is an arc structure. The arc structure is stacked above the positive electrode 1011 of the cylindrical battery cell 101, and the arc structure is concentric with the positive electrode 1011 of the cylindrical battery cell 101 and has the same radius.

[0058] The side negative electrode welding branch 4022 is a crescent-shaped structure, which includes an inner side arc and an outer side arc that are integrally arranged and concentric with the cylindrical battery cell 101, and the outer side arc is integrally connected to the side negative electrode busbar body 4021, and the radius of the inner side arc is greater than the radius of the positive electrode 1011 to reserve an electrical gap. The radius of the outer side arc is not greater than the radius of the negative electrode 1012.

[0059] The side series busbar 40 is a metal stamping sheet metal structure. The side negative electrode welding branch 4022 and the side positive electrode welding branch 4011 have a stamping drop. The stamping depth is equal to the height difference between the cylindrical end faces of the positive electrode 1011 and the negative electrode 1012 of the cylindrical battery cell 101.

[0060] The main body of the side series busbar 40 is also provided with a second flange structure 403, which is at right angles to the side negative electrode welding branch 4022 and the side positive electrode welding branch 4011, and is mainly used to reduce the width of the module while ensuring the electrical gap. In addition, after the sheet metal of the side series busbar 40 is unfolded, its cross-sectional height gradually increases from left to right in a step-shaped manner, and then gradually decreases in a step-shaped manner, mainly because the current carrying capacity gradually increases from left to right and then gradually decreases. This design effectively reduces the weight and cost of the side series busbar 40.

[0061] The middle area of ​​the side series bus 40 (the connection between the side positive bus body 4012 and the side negative bus body 4021), that is, the part that carries the series current, can weaken the structure 404 as needed (such as reducing the cross-sectional area or weakening the cross-section) to serve as a fuse, integrating the fuse and bus functions.

[0062] Please refer to Fig. 9 The total positive electrode bus 50 includes a total positive electrode bus body 502 and a plurality of total positive electrode welding branches 501 integrally and spaced apart on one side of the total positive electrode bus body 502 , and each total positive electrode welding branch 501 is respectively welded to the positive electrode 1011 of a cylindrical battery cell 101 of a battery cell group 10 .

[0063] The total positive electrode welding branch 501 is a short strip structure, and its end is an arc structure. The arc structure is stacked above the positive electrode 1011 of the cylindrical battery cell 101, and the arc structure is concentric with the positive electrode 1011 of the cylindrical battery cell 101 and has the same radius.

[0064] The main body 502 of the total positive busbar is also provided with a third flange structure 503 and a fourth flange structure 504. The third flange structure 503 is arranged on the outer side surface of the main body 502 of the total positive busbar, and the fourth flange structure 504 is arranged on the outer end surface of the main body 502 of the total positive busbar. The third flange structure 503 and the fourth flange structure 504 are both at right angles to the total positive electrode welding branch 501, and are mainly used to reduce the width and length of the module while ensuring the electrical gap. In addition, after the sheet metal of the total positive busbar 50 is unfolded, the height of its main cross-section gradually increases from left to right, mainly because the current carrying capacity gradually increases from left to right. This design effectively reduces the weight and cost of the total positive busbar 50. At the same time, a circular mounting hole 505 is arranged at the right end of the main body 502 of the total positive busbar, which is used to connect and fix the busbar or high-voltage wiring harness between other modules when the positive electrode is led out.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A cylindrical battery module, characterized in that: It comprises a plurality of battery cell groups connected in series, each of which comprises a plurality of cylindrical battery cells connected in parallel, the plurality of cylindrical battery cells in each of which are arranged side by side along the length direction of the module, and the plurality of cylindrical battery cells in each of which are arranged side by side along the width direction of the module; a plurality of rows of battery cell groups and a plurality of columns of battery cell groups are arranged along the length direction of the module, each row of battery cell groups comprises a plurality of battery cell groups arranged side by side along the length direction of the module, and each column of battery cell groups comprises a plurality of battery cell groups arranged side by side along the width direction of the module.

2. The module according to claim 1, characterized in that: Each of the battery cell groups further includes a positive bus and a negative bus, the positive electrodes of the multiple cylindrical battery cells in the battery cell group are connected in parallel via the positive bus, and the negative electrodes of the multiple cylindrical battery cells in the battery cell group are connected in parallel via the negative bus; In the same column of cell groups arranged along the length direction of the module, two adjacent cell groups are connected in series by connecting the positive electrode bus of one cell group to the negative electrode bus of the other cell group; In two adjacent columns of cell groups arranged along the length direction of the module, two adjacent cell groups in the first row or the last row are connected in series via the positive electrode bus of one of the cell groups and the negative electrode bus of the other cell group.

3. The module according to claim 2, characterized in that: The positive busbar includes a positive busbar body and a plurality of positive electrode welding branches which are integrally and spaced apart on one side of the positive busbar body. The positive busbar body is located on one side of the battery cell group. Each of the positive electrode welding branches is respectively welded to the positive electrode of one of the cylindrical battery cells.

4. The module according to claim 3, characterized in that: The positive electrode and the negative electrode of the cylindrical battery cell are concentrically arranged at the same end of the cylindrical battery cell, the negative electrode is located at the end surface of the cylindrical battery cell, the positive electrode is a cylindrical structure protruding from the negative electrode, and the radius of the positive electrode is smaller than the radius of the negative electrode.

5. The module according to claim 4, characterized in that: The end of the positive electrode welding branch is an arc structure, the arc structure is stacked above the positive electrode of the cylindrical battery cell, and the arc structure is concentric with the positive electrode of the cylindrical battery cell and has the same radius.

6. The module according to claim 4, characterized in that: The negative busbar includes a negative busbar body and a plurality of negative electrode welding branches which are integrally and spaced apart on one side of the negative busbar body. The negative busbar body is located on one side of the battery cell group. Each of the negative electrode welding branches is respectively welded to the negative electrode of one of the cylindrical battery cells.

7. The module according to claim 6, characterized in that: The negative electrode welding branch is a crescent-shaped structure, which includes an inner arc and an outer arc that are integrally arranged and concentric with the cylindrical battery cell. The outer arc is integrally connected to the negative electrode bus body. The radius of the inner arc is greater than the radius of the positive electrode, and the radius of the outer arc is not greater than the radius of the negative electrode.

8. The module according to claim 7, characterized in that: The negative electrode welding branch is lower than the negative electrode busbar body, and the thickness of the negative electrode welding branch is the height difference between the positive electrode cylindrical end surface and the negative electrode cylindrical end surface of the cylindrical battery cell.

9. The module according to claim 8, characterized in that: In the same column of cell groups arranged along the length direction of the module, the positive busbar body of the positive busbar of one of the two adjacent cell groups is integrally connected to the negative busbar body of the negative busbar of the other cell group at the side to form an intermediate series busbar.

10. The module according to claim 8, characterized in that: In two adjacent columns of cell groups arranged along the length direction of the module, the positive bus body of the positive bus of one of the two adjacent cell groups in the first row or the last row and the negative bus body of the negative bus of the other cell group are integrally connected at the end surface to form a side series bus.

11. The module according to claim 10, characterized in that: A weakening structure is provided at the connection between the positive busbar body and the negative busbar body of the side series busbar.

12. The module according to claim 2, characterized in that: An even number of rows of cell groups are arranged along the length direction of the module, the positive bus outside the first cell group in the first row of cell groups arranged along the length direction of the module is the total positive bus, and the negative bus outside the last cell group in the first row of cell groups is the total negative bus.

Images