Welding tool for battery module

Abstract

The utility model relates to the technical field of battery preparation, in particular to a battery module welding tool which comprises a supporting assembly and a locking assembly, and a first mounting groove is formed in the supporting assembly and used for containing a battery module; a locking assembly is arranged on the side, where the pole columns are formed, of the battery pole group, the locking assembly comprises a pressing component, an auxiliary pressing component and a pressing component, and the pressing component is arranged on one side of the battery module and placed in the first mounting groove; a second mounting groove is formed in the pressing component and is used for placing an aluminum bar; a first welding through hole corresponding to the pole is formed in the pressing component; and the auxiliary pressing component is provided with a welding protruding part extending into the welding through hole, the welding protruding part is provided with a second welding through hole, and the pressing component is arranged on the supporting assembly and used for driving the welding protruding part of the pressing component to press the pole of the battery module. Therefore, positioning of the aluminum bar and the pole is achieved through the welding tool, time and labor are saved, and production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery preparation, and in particular to a welding tool for a battery module. Background Art

[0002] Blade cells have demonstrated their value in safety, cycle life, fast charging, and low-temperature discharge, and are poised to become the mainstream choice for future new energy vehicle power batteries. However, for existing blade cells, the assembly of small and medium-volume battery modules requires welding the aluminum busbars to the cell's aluminum terminals to achieve high current carrying capacity. This process currently requires manual press welding using tools, making it cumbersome, time-consuming, and labor-intensive. Utility Model Content

[0003] The purpose of this application is to provide a welding tool for a battery module, which to a certain extent solves the technical problem in the prior art that during the process of assembling blade batteries into battery modules, the aluminum busbars need to be welded together with the aluminum poles of the battery cells in order to carry large currents. Currently, manual press welding is required using tools, which is cumbersome, time-consuming and labor-intensive.

[0004] The present application provides a welding tool for a battery module, comprising: a support assembly and a locking assembly; wherein the support assembly is formed with a first mounting groove and is used to place a battery module assembled from multiple battery cells; the locking assembly is provided on a side of the battery electrode group where the electrode is formed, and each of the locking assemblies includes a pressing member, an auxiliary pressing member, and a pressing member, wherein the pressing member is provided on one side of the battery module and is placed in the first mounting groove; the pressing member is formed with a second mounting groove and is used to place an aluminum bar, and the aluminum bar is assembled with the electrode;

[0005] The pressing member is formed with a first welding through-hole corresponding to the fitting position of the aluminum bar and the pole; the auxiliary pressing member is formed with a welding protrusion extending into the first welding through-hole, and the welding protrusion is formed with a second welding through-hole; the clamping member is arranged on the supporting assembly and is used to drive the welding protrusion of the pressing member to clamp the aluminum bar and the pole.

[0006] In the above technical solution, further, the locking assembly also includes a slide rail and a slider; wherein, the slide rail is arranged on the support assembly and extends along the arrangement direction of the multiple battery cells in the battery module, the slider is arranged on the clamping member, and the slider is slidably connected to the slide rail.

[0007] In any of the above technical solutions, further, the locking assembly also includes a connecting member, the slider is arranged on the connecting member, and the pressing member is connected to the connecting member.

[0008] In any of the above technical solutions, further, the pressing member and the connecting member are detachably connected via a first fastening member.

[0009] In any of the above technical solutions, further, the support assembly includes a support member, a side limiting member and a locking member; wherein, the support member is formed with the first mounting groove and a top opening and a side opening connected to the first mounting groove; the side limiting member is arranged at the side opening and is detachably connected to the support member through the locking member, and is used to limit the side of the battery module.

[0010] In any of the above technical solutions, further, the locking member is a buckle, and the buckle is provided on the supporting member or the side limiting member.

[0011] In any of the above technical solutions, further, the support assembly is formed with an avoidance gap that passes through the top thereof and is connected to the first installation groove, and a flexible protective component is provided in the avoidance gap.

[0012] In any of the above technical solutions, further, the material of the main body of the auxiliary pressing member is an insulating material, and the material of the welding protrusion of the auxiliary pressing member is a metal material.

[0013] In any of the above technical solutions, further, the number of the pressing members in any group of the locking assemblies is multiple, and the multiple pressing members are arranged sequentially along the arrangement direction of the multiple battery cells in the battery module, and the number of the pressing members in any group of the locking assemblies is also multiple, and corresponds one-to-one to the multiple pressing members.

[0014] In any of the above technical solutions, further, the pressing member and the auxiliary pressing member are detachably connected via a second fastening member.

[0015] In any of the above technical solutions, further, a pressing protrusion is formed on the inner wall of the second mounting groove opposite to the aluminum bar.

[0016] In any of the above technical solutions, further, the pressing member is a toggle clamp.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The welding tooling of the battery module provided by the present application can be used to constrain the position of the aluminum bar. After the position is constrained, the aluminum bar is not easy to be skewed, which improves the levelness of the aluminum bar after welding. At the same time, the gap between the aluminum bar and the battery cell pole is constrained, so that the aluminum bar is flat to the surface of the battery cell pole, reducing the welding defects such as cold welding and blown welding caused by the gap. Moreover, the aluminum bar has been positioned during welding. The laser only needs to find the welding through hole in the center part of the battery cell pole, and weld around the welding through hole according to the set welding parameters. There is no need to add an additional downward pressure mechanism, which saves equipment modification costs. In addition, the above process does not require manual operation, saves time and effort, and improves production efficiency.

[0019] In addition, the locking assembly can slide in the horizontal direction, making it easy to switch to the next welding target after welding, greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 The welding tooling of the battery module and the assembly drawing of the battery module provided in the embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of a local enlarged structure;

[0023] Figure 3 The welding tooling of the battery module and the assembly drawing of the battery module provided in the embodiment of the present application;

[0024] Figure 4 for Figure 3 Schematic diagram of a local enlarged structure;

[0025] Figure 5 Assembly diagram of the welding fixture and aluminum busbar of the battery module provided in the embodiment of the present application;

[0026] Figure 6 Another assembly diagram of the welding fixture and aluminum bars of the battery module provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the partial structure of the welding tooling for the battery module provided in an embodiment of the present application;

[0028] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at A;

[0029] Figure 9 Another partial structural diagram of the welding tooling for the battery module provided in an embodiment of the present application;

[0030] Figure 10 for Figure 9 A schematic diagram of the enlarged structure at B;

[0031] Figure 11 A schematic structural diagram of a welding tool for a battery module provided in an embodiment of the present application;

[0032] Figure 12 for Figure 11 Schematic diagram of the enlarged structure at C;

[0033] Figure 13 A schematic structural diagram of a welding tool for a battery module provided in an embodiment of the present application;

[0034] Figure 14 for Figure 13 Schematic diagram of the enlarged structure at D;

[0035] Figure 15 A schematic diagram of the structure of the support assembly provided in an embodiment of the present application;

[0036] Figure 16 Another structural schematic diagram of the support assembly provided in an embodiment of the present application;

[0037] Figure 17 for Figure 16 Schematic diagram of the enlarged structure at E.

[0038] Reference numerals:

[0039] 1-support assembly, 11-support member, 111-first mounting groove, 112-avoidance gap, 113-flexible protective member, 114-bottom plate, 115-side beam, 116-third fastening member, 12-side limiting member, 13-locking member, 2-locking assembly, 21-pressing member, 211-second mounting groove, 212-pressing protrusion, 22-auxiliary pressing member, 221-welding protrusion, 2211-second welding through hole, 222-body, 23-pressing member, 24-slide rail, 25-connecting member, 26-first fastening member, 27-second fastening member, 3-battery module, 4-aluminum row. DETAILED DESCRIPTION

[0040] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0042] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] Refer to the following Figures 1 to 17 The welding tooling of the battery module according to some embodiments of the present application is described.

[0046] See also Figures 1 to 15 As shown, an embodiment of the present application provides a battery module welding tool, comprising: a support assembly 1 and a locking assembly 2; wherein the support assembly 1 is formed with a first mounting groove 111 and a top opening connected to the first mounting groove 111, the first mounting groove 111 is used to place a battery module 3 assembled from multiple battery cells, and the top opening serves to avoid the battery module 3;

[0047] Both sides of the battery module 3 are formed with poles, and locking assemblies 2 are provided on both sides of the battery electrode group where the poles are formed. Each locking assembly 2 includes a pressing member 21, an auxiliary pressing member 22, and a pressing member 23. The pressing member 21 is provided on one side of the battery module 3 and is also placed in the first mounting groove 111. The pressing member 21 is formed with a second mounting groove 211 for placing the aluminum bar 4, and the aluminum bar 4 is assembled with the pole.

[0048] The pressing member 21 is formed with a first welding through-hole, and the first welding through-hole corresponds to the fitting position of the aluminum busbar 4 and the pole; the auxiliary pressing member 22 is formed with a welding protrusion 221 extending into the welding through-hole, and the welding protrusion 221 is formed with a second welding through-hole 2211, and the clamping member 23 is arranged on the support assembly 1, and is used to drive the welding protrusion 221 of the pressing member 21 to clamp the aluminum busbar 4 and the pole so that the two are tightly fitted.

[0049] According to the structure described above, the use process of the welding tooling of the battery module provided in this application is as follows:

[0050] Step 1: Place the stacked battery modules 3 on the support assembly 1;

[0051] Step 2: Place the aluminum bar 4 in the first mounting groove 111 of one pressing member 21, i.e., the first pressing member, corresponding to the A surface of the battery module 3. Place the aluminum bar 4 in the first mounting groove 111 of the other pressing member 21, i.e., the second pressing member, corresponding to the B surface of the battery module 3. After placement, tighten the side limiting members 12 with buckles to achieve positioning of the battery module 3.

[0052] Step 3: After completing step 2 above, move both pressing members 23 toward the battery module 3 to firmly hold the aluminum busbar 4. Then, lock the two pressing members 23 so that they cannot reciprocate, thereby achieving a tight fit between the aluminum busbar 4 and the battery cell poles.

[0053] Step 4: The laser beam is applied to the aluminum busbar 4 through the second welding through-hole 2211 on the welding protrusion 221, and the aluminum busbar 4 and the battery cell pole are melted by high energy to form a welding pool. After cooling, the aluminum busbar 4 and the battery cell pole are firmly welded together;

[0054] Step 5: gradually move the locking assembly 2 along the slide rail 24 to weld the entire A-side battery cell of the module;

[0055] Step 6: After welding the A-side battery cell poles, continue welding the B-side battery cell poles by rotating the support assembly 1. Please refer to the above steps. It should be noted that the specific operation steps are not limited to the above steps and can be selected according to actual needs.

[0056] It can be seen that the welding tooling of the battery module provided by the present application can constrain the position of the aluminum bar 4. After the position is constrained, the aluminum bar 4 is not easy to be skewed, which improves the levelness of the aluminum bar 4 after welding. At the same time, the gap between the aluminum bar 4 and the battery cell pole is constrained, so that the aluminum bar 4 is flat to the surface of the battery cell pole, reducing the poor welding conditions such as cold welding and blown welding caused by the gap. Moreover, the aluminum bar 4 has been positioned during welding. The laser only needs to find the welding through hole in the center part of the battery cell pole, and weld around the welding through hole according to the set welding parameters. There is no need to add an additional downward pressure mechanism, which saves equipment modification costs. In addition, the above process does not require manual operation, saves time and effort, and improves production efficiency.

[0057] Furthermore, preferably, two locking assemblies 2 are provided on both sides of the battery module 3 where the pole is formed. Of course, it is not limited to this. One locking assembly 2 or more than two locking assemblies 2, such as three or four, may also be provided on both sides of the battery module 3 where the pole is formed.

[0058] It should be noted that: it is not limited to the case where poles are formed on both sides of the battery module 3, and locking components 2 are provided on both sides of the battery electrode group where poles are formed. It is also possible that poles are formed on only one side of the battery module 3, and then the locking component 13 is only provided on the side where the poles are formed.

[0059] In this embodiment, preferably, Figure 1 and Figure 2 As shown, any locking assembly 2 also includes a slide rail 24 and a slider; wherein, the slide rail 24 is arranged on the support assembly 1 and extends along the arrangement direction of the multiple battery cells in the battery module 3, the slider is arranged on the clamping member 23, and the slider is slidably connected to the slide rail 24, that is, the slider can slide along the arrangement direction of the multiple battery cells in the battery module 3.

[0060] According to the structure described above, the slider slides along the slide rail 24, thereby driving the locking assembly 2 to move along the arrangement direction of multiple battery cells in the battery module 3, so as to conveniently switch to the next welding target after welding.

[0061] Furthermore, preferably, the slide rail 24 is provided on the side beam 115 of the support member 11 described below. Of course, the present invention is not limited thereto.

[0062] In this embodiment, preferably, Figure 1 and Figure 2 As shown, any locking assembly 2 further includes a connecting member 25 , the slider is disposed on the connecting member 25 , and the pressing member 23 is connected to the connecting member 25 .

[0063] According to the structure described above, the connecting member 25 plays a role of transfer, especially when there are multiple locking assemblies 2, multiple locking assemblies 2 are integrated on one connecting member 25, and a slider can be set on this connecting member 25 to thereby slideably connect with the slide rail 24.

[0064] Furthermore, preferably, the connecting member 25 may be a rectangular plate, but is not limited thereto.

[0065] It should be noted that the slide rail 24 , the slider and the connecting member 25 may not be provided, that is, the aforementioned pressing member 23 is directly fixedly connected to the supporting member 11 , and the specific selection can be made according to actual needs.

[0066] In this embodiment, preferably, Figure 1 As shown, the pressing member 23 and the connecting member 25 are detachably connected via a first fastening member 26 such as a screw or a bolt.

[0067] According to the structure described above, the connecting member 25 and the supporting member 11 are connected in a detachable manner, which is convenient for later maintenance or replacement.

[0068] In this embodiment, preferably, Figure 1 、 Figure 3 and Figure 15 As shown, the support assembly 1 includes a support member 11, a side limiting member 12 and a locking member 13; wherein, the support member 11 is formed with a first mounting groove 111 and a top opening and a side opening connected to the first mounting groove 111; the side limiting member 12 is arranged at the side opening and is detachably connected to the support member 11 through the locking member 13, and is used to limit the side of the battery module 3.

[0069] According to the structure described above, it can be seen that the assembly of the battery module 3 and the pressing member 21 is first placed in the first mounting groove 111, and then the side limiting member 12 is locked together with the supporting member 11 on the side of the mounting groove using the locking member 13, thereby fixing the assembly of the aforementioned battery module 3 and the pressing member 21, which also plays a limiting role.

[0070] It should be noted that the side limiting member 12 and the supporting member 11 can be fixedly connected or have an integrated structure, which can be selected according to actual needs.

[0071] In this embodiment, preferably, Figure 1 and Figure 15 As shown, the locking member 13 is a buckle, and the buckle is provided on the supporting member 11. Of course, it is not limited to this, and the buckle can also be provided on the side limiting member 12, depending on actual needs.

[0072] According to the structure described above, the locking member 13 adopts a buckle structure, which is extremely convenient to use and improves work efficiency. Of course, the structure of the locking member 13 is not limited to this, and can also be a bolt. Then, correspondingly, the support member 11 and the side limiting member 12 can be connected and fixed by bolts.

[0073] In this embodiment, preferably, Figure 8 As shown, the material of the main body 222 of the auxiliary pressing member 22 is an insulating material, and the material of the welding protrusion 221 of the auxiliary pressing member 22 is a metal material.

[0074] As can be seen from the structure described above, the body 222 can be made of plastic, which is lightweight. The welding protrusion 221, as the welding area, is subjected to higher temperatures, so it is made of metal to extend its service life. Of course, this is not limited to this. The body 222 and the welding protrusion 221 can also be made of the same material, such as metal.

[0075] In addition, it should be noted that the support member 11 and the side limiting member 12 are both made of insulating materials, such as bakelite.

[0076] In this embodiment, preferably, Figure 1 and Figure 15 As shown, the support member 11 of the support assembly 1 is formed with an avoidance gap 112 running through the top thereof, and a flexible protective member 113 is arranged in the avoidance gap 112 .

[0077] According to the structure described above, the avoidance gap 112 is mainly used to avoid the outlet plug-in of the heating film on the battery module 3, and a flexible protective component 113 is provided in the avoidance gap 112 to protect the outlet plug-in.

[0078] Furthermore, preferably, the flexible protective member 113 is made of foam. Of course, it is not limited thereto and may be a flexible member made of other materials, which can be selected according to actual needs.

[0079] Furthermore, preferably, the avoidance gap 112 is provided on the side beam 115 of the support member 11 described below.

[0080] In this embodiment, preferably, Figure 2 and Figure 4 As shown, the number of pressing members 21 in any group of locking assemblies 2 is multiple, and the multiple pressing members 21 are arranged sequentially along the arrangement direction of the multiple battery cells in the battery module 3. The number of pressing members 23 and auxiliary pressing members 22 in any group of locking assemblies 2 is also multiple, and corresponds one-to-one to the multiple pressing members 21.

[0081] According to the structure described above, each group of locking components 2 is provided with multiple pressing components 21, clamping components 23 and auxiliary pressing components 22, which can improve the welding efficiency. Of course, it is not limited to this. Each group of locking components 2 can also be provided with only one pressing component 21, one clamping component 23 and one auxiliary pressing component 22, and the specific selection is based on actual needs.

[0082] In this embodiment, preferably, Figure 1 As shown, the pressing member 21 and the battery module 3 can also be detachably connected via a second fastening member 27 such as a screw or a bolt, thereby facilitating the assembly of the pressing member 21 and the battery module 3 together.

[0083] In this embodiment, preferably, Figures 11 to 14 As shown, the inner wall of the second mounting groove 211, which faces the aluminum busbar 4, is formed with a pressing protrusion 212. This pressing protrusion 212 can further compress the aluminum busbar 4, ensuring a tighter fit between the aluminum busbar 4 and the battery cell terminal. Of course, the pressing protrusion 212 can also be omitted, depending on actual needs.

[0084] Furthermore, preferably, the clamping protrusion 212 is formed with an avoidance hole, which can avoid the area to be welded. It should be noted that when the clamping protrusion 212 is located on the outside of the second welding through hole 2211, the clamping protrusion 212 will not block the second welding through hole 2211, so there is no need to open an avoidance hole on the clamping protrusion 212. The specific design is based on actual needs.

[0085] In this embodiment, preferably, Figure 2 As shown, the pressing member 23 is a toggle clamp, which is more convenient to use. Of course, the pressing member 23 is not limited to this, and it can also be a linear motor or a screw drive structure, etc., specifically selected according to actual needs.

[0086] In this embodiment, preferably, Figures 15 to 17 As shown, the support member 11 includes a base plate 114 and three side beams 115. The base plate 114 is preferably rectangular. The three side beams 115 are all arranged on the upper surface of the base plate 114 and respectively correspond to the three sides of the base plate 114. The aforementioned side limiting member 12 can also be a side beam structure, which together with the aforementioned three side beams 115 forms a rectangular frame structure for placing a rectangular battery module 3. Of course, it is not limited to the rectangular side limiting member 12, and the shape of the frame can also be set according to the shape of the battery module 3, etc.

[0087] Furthermore, preferably, the side beam 115 and the bottom plate 114 can be detachably connected via a third fastening member 116 such as a screw or a bolt. Of course, the present invention is not limited thereto, and the side beam 115 can also be an integral structure with the bottom plate 114 , etc.

[0088] In summary, the detailed usage process of the battery module welding tooling provided in this application is as follows:

[0089] Step 1: Place the stacked battery modules 3 on the support member 11;

[0090] Step 2: Place the aluminum bar 4 in the first mounting groove 111 of a pressing member 21, i.e., the first pressing member, corresponding to the A surface of the battery module 3. Place the aluminum bar 4 in the first mounting groove 111 of another pressing member 21, i.e., the second pressing member, corresponding to the B surface of the battery module 3. After placement, fix the first pressing member, the second pressing member, and the two end plates of the battery module 3 together using second fastening members 27, such as bolts, and tighten the side limiting members 12 using buckles to achieve positioning of the battery module 3.

[0091] Step 3: After completing step 2 above, move the two pressing members 23, such as elbow clamps, toward the battery module 3 to firmly hold the aluminum busbar 4. Then, lock the two pressing members 23, such as locking them, so that they cannot move back and forth, thereby achieving a tight fit between the aluminum busbar 4 and the battery cell poles.

[0092] Step 4: The laser beam is applied to the aluminum busbar 4 through the second welding through-hole 2211 on the welding protrusion 221, and the aluminum busbar 4 and the battery cell pole are melted by high energy to form a welding pool. After cooling, the aluminum busbar 4 and the battery cell pole are firmly welded together;

[0093] Step 5: gradually move the locking assembly 2 along the slide rail 24 to weld the entire A-side battery cell of the module;

[0094] Step 6: After welding the A-side battery cell poles, continue welding the B-side battery cell poles by rotating the support member 11. The above steps can be referred to. Of course, the steps are not limited to the above and can be adjusted according to actual needs.

[0095] In combination with the above, it can be seen that the welding tooling of the battery module provided by the present application can be used to constrain the position of the aluminum bar 4. After the position is constrained, the aluminum bar 4 is not easy to be skewed, which improves the levelness of the aluminum bar 4 after welding. At the same time, the gap between the aluminum bar 4 and the battery cell pole is constrained, so that the aluminum bar 4 is flat to the surface of the battery cell pole, reducing the poor welding conditions such as cold welding and blown welding caused by the gap. Moreover, the aluminum bar 4 has been positioned during welding. The laser only needs to find the welding through hole in the center part of the battery cell pole, and weld around the welding through hole according to the set welding parameters. There is no need to add an additional downward pressure mechanism, which saves equipment modification costs. In addition, the above process does not require manual operation, saves time and effort, and improves production efficiency. In addition, the locking assembly 2 can slide in the horizontal direction, and then it is convenient to switch to the next welding target after welding is completed, which greatly improves production efficiency.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A welding tool for a battery module, characterized in that: The battery pack comprises a support assembly and a locking assembly; wherein the support assembly is formed with a first mounting groove and is used to place a battery module assembled from multiple battery cells; the locking assembly is provided on the side of the battery pole group where the pole is formed, and each of the locking assemblies includes a pressing member, an auxiliary pressing member, and a pressing member, wherein the pressing member is provided on one side of the battery module and is placed in the first mounting groove; the pressing member is formed with a second mounting groove and is used to place an aluminum bar, and the aluminum bar is assembled with the pole; The pressing member is formed with a first welding through-hole corresponding to the fitting position of the aluminum bar and the pole; the auxiliary pressing member is formed with a welding protrusion extending into the first welding through-hole, and the welding protrusion is formed with a second welding through-hole; the clamping member is arranged on the supporting assembly and is used to drive the welding protrusion of the pressing member to clamp the aluminum bar and the pole.

2. The welding tool for the battery module according to claim 1, characterized in that: The locking assembly also includes a slide rail and a slider; wherein the slide rail is arranged on the support assembly and extends along the arrangement direction of the multiple battery cells in the battery module, the slider is arranged on the clamping member, and the slider is slidably connected to the slide rail.

3. The welding tool for the battery module according to claim 2, characterized in that: The locking assembly further includes a connecting member, the slider is arranged on the connecting member, and the pressing member is connected to the connecting member.

4. The welding tool for the battery module according to claim 3, characterized in that: The pressing member and the connecting member are detachably connected via a first fastening member.

5. The welding tool for the battery module according to claim 1, characterized in that: The support assembly includes a support member, a side limiting member and a locking member; wherein, the support member is formed with the first mounting groove and a top opening and a side opening connected to the first mounting groove; the side limiting member is arranged at the side opening and is detachably connected to the support member through the locking member, and is used to limit the side of the battery module.

6. The welding tool for the battery module according to claim 5, characterized in that: The locking member is a buckle, and the buckle is arranged on the supporting member or the side limiting member.

7. The welding tool for the battery module according to claim 1, characterized in that: The support assembly is formed with an avoidance gap which passes through the top thereof and is in communication with the first installation groove, and a flexible protective component is arranged in the avoidance gap.

8. The welding tool for battery modules according to claim 1, characterized in that: The material of the main body of the auxiliary pressing member is an insulating material, and the material of the welding protrusion of the auxiliary pressing member is a metal material.

9. The welding tool for battery modules according to claim 1, characterized in that: The number of the pressing components in any group of the locking assemblies is multiple, and the multiple pressing components are arranged sequentially along the arrangement direction of the multiple battery cells in the battery module. The number of the pressing components in any group of the locking assemblies is also multiple, and corresponds one-to-one to the multiple pressing components.

10. The welding tool for the battery module according to any one of claims 1 to 9, characterized in that: The pressing member and the auxiliary pressing member are detachably connected via a second fastening member; and / or The inner wall of the second mounting groove opposite to the aluminum bar is formed with a pressing protrusion; and / or The pressing member is a toggle clamp.

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