Welding jig for battery cell protection plate assembly

Abstract

The utility model discloses a welding jig for a battery cell protection plate assembly, and relates to the technical field of battery machining, the welding jig comprises a positioning mechanism and a cooling mechanism, the positioning mechanism is provided with a positioning welding area, and the positioning welding area is used for containing the battery cell protection plate assembly; the cooling mechanism comprises a spraying part, and the spraying part is opposite to the positioning welding area and used for spraying a cooling medium to the positioning welding area. When the protection plate main body in the positioning welding area is welded, the spraying part can spray a cooling medium to the positioning welding area so as to properly reduce the temperature of the nickel sheet, and the phenomenon of secondary tin melting at the welding disc of the nickel sheet and the protection plate main body can be effectively prevented, so that the welding strength of the nickel sheet and the protection plate main body is improved; and the electrical performance of the battery is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a welding jig for a battery cell protection plate assembly. Background Art

[0002] At present, most batteries adopt a protection board + battery cell structure. The protection board and the battery cell are connected by a nickel sheet. The protection board is an important component used to monitor and control the working status of the battery cell and prevent abnormal situations such as overcharging, over-discharging, and short circuit of the battery cell.

[0003] In the related art, the protection board includes PCB (Printed Circuit Board) and FPC (Flexible Printed Circuit). In order to facilitate the connection between the protection board and the battery cell, the nickel sheet will be welded to one side of the PCB first, and then the FPC will be welded to the other side of the PCB, and then the protection board and the nickel sheet will be connected to the battery cell. Since the welding position of the nickel sheet and the PCB and the welding position of the FPC and the PCB overlap, when the FPC and the PCB are welded, the high temperature generated by the welding will be transmitted to the welding position of the nickel sheet and the PCB, which may cause the secondary melting of the nickel sheet and the PCB pad, resulting in poor welding strength between the nickel sheet and the PCB, and even affecting the electrical performance of the battery. Summary of the invention

[0004] The present application discloses a welding jig for a battery protection board assembly to solve the problem in the related art that secondary tin melting occurs between a nickel sheet and a soldering pad of a PCB, resulting in poor welding strength between the nickel sheet and the PCB.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The embodiment of the present application discloses a welding jig for a battery protection plate assembly, wherein the battery protection plate assembly comprises a battery protection plate and a nickel sheet, the battery protection plate is welded to the nickel sheet, and the welding jig comprises a positioning mechanism and a cooling mechanism;

[0007] The positioning mechanism is provided with a positioning welding area, and the positioning welding area is used to accommodate the battery cell protection plate assembly;

[0008] The cooling mechanism comprises a spraying part, which is arranged opposite to the tack welding area and is used for spraying a cooling medium to the tack welding area.

[0009] The technical solution adopted in this application can achieve the following technical effects:

[0010] The welding jig disclosed in the embodiment of the present application improves the related technology. The disclosed welding jig includes a positioning mechanism and a cooling mechanism. The positioning mechanism is provided with a positioning welding area, and the positioning welding area is used to accommodate the battery cell protection plate assembly; the cooling mechanism is provided with a spray part, and the spray part is arranged opposite to the positioning welding area, and is used to spray a cooling medium to the positioning welding area. When welding the protection plate body in the positioning welding area, the spray part can spray a cooling medium to the positioning welding area to appropriately reduce the temperature of the nickel sheet, which can effectively prevent the secondary tin melting phenomenon at the welding pad of the nickel sheet and the protection plate body, thereby improving the welding strength between the nickel sheet and the protection plate body, and then improving the electrical performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 An exploded view of a welding jig disclosed in an embodiment of the present application;

[0012] Figure 2 This is a schematic diagram of the structure of a welding jig disclosed in an embodiment of the present application;

[0013] Figure 3 This is one of the side views of the welding jig disclosed in the embodiment of the present application;

[0014] Figure 4 This is a second side view of the welding jig disclosed in the embodiment of the present application;

[0015] Figure 5 A top view of a welding jig disclosed in an embodiment of the present application;

[0016] Figure 6 This application manual is attached Figure 5 Sectional view along the middle line AA;

[0017] Figure 7 A schematic diagram of the structure of the cooling mechanism disclosed in the embodiment of the present application;

[0018] Figure 8 An exploded view of the cooling mechanism disclosed in the embodiment of the present application;

[0019] Fig. 9 A top view of the cooling mechanism disclosed in the embodiment of the present application;

[0020] Fig.10 A schematic diagram of an air cooling pipeline of a cooling mechanism disclosed in an embodiment of the present application;

[0021] Fig.11 A schematic diagram of the structure of a switch assembly disclosed in an embodiment of the present application;

[0022] Fig.12 A cross-sectional view of the switch assembly and the base disclosed in the embodiment of the present application;

[0023] Fig.13 A schematic diagram of the structure of the positioning mechanism disclosed in the embodiment of the present application;

[0024] Fig.14 An exploded view of the battery cell protection board assembly disclosed in the embodiment of the present application;

[0025] Fig.15 A front view of a battery cell protection board assembly disclosed in an embodiment of the present application;

[0026] Fig.16 This is a top view of the battery cell protection board assembly disclosed in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 100-welding fixture, 110-positioning mechanism, 111-positioning welding area, 112-bottom plate, 1121-positioning groove, 1122-avoidance hole, 113-cover plate, 1131-operation hole, 114-shaft rod, 115-sleeve, 116-positioning column, 117-positioning hole, 118-magnetic part, 120-cooling mechanism, 121-injection part, 1211-nozzle, 122-base, 122 1-installation groove, 1222-guide hole, 1223-limiting platform, 1224-installation hole, 1225-positioning part, 123-air cooling pipeline, 1231-main pipeline, 1232-branch pipeline, 124-switch assembly, 1241-switch body, 1242-pressure ring, 1243-flow guide pipe, 1244-elastic part, 1245-guide column, 1246-limiting protrusion, 125-flow regulating valve;

[0029] 200-battery cell protection board assembly, 210-protection board body, 211-PCB, 212-FPC, 220-nickel sheet. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0032] The technical solutions disclosed in various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0033] Please refer to Figures 1 to 16 The embodiment of the present application discloses a welding fixture 100 for a battery cell protection plate assembly 200. The welding fixture 100 is used to position the battery cell protection plate assembly 200 so as to facilitate welding the battery cell protection plate assembly 200 using a welding device. Figures 14 to 16 As shown, the battery cell protection board assembly 200 may include a protection board body 210 and a nickel sheet 220, and the protection board body 210 and the nickel sheet 220 are welded to facilitate the subsequent connection of the protection board body 210 and the battery cell through the nickel sheet 220. The protection board body 210 may specifically include a PCB 211 and an FPC 212, and the PCB 211 includes a first board surface and a second board surface opposite to each other. When welding the battery cell protection board assembly 200, the nickel sheet 220 may be first welded to the first board surface of the PCB 211, and then the FPC 212 may be welded to the second board surface of the PCB 211. The nickel sheet 220 is used to weld to the tab of the battery cell, and the FPC 212 is used to plug in with an electronic device, so that the electronic device can obtain the state parameters of the battery cell, and control the charging and discharging process of the battery cell through the FPC 212 and the PCB 211.

[0034] like Figures 1 to 6 As shown, the welding fixture 100 may include a positioning mechanism 110, and the positioning mechanism 110 is provided with a positioning welding area 111, and the positioning welding area 111 is used to accommodate the battery protection board assembly 200. The positioning welding area 111 can be a groove structure, or it can be a limiting area surrounded by multiple positioning protrusions. As long as the PCB211, FPC212 and nickel sheet 220 can be positioned to facilitate the welding operation of the welding device, the embodiment of the present application does not limit the specific form of the positioning welding area 111. When the battery protection board assembly 200 is placed in the positioning welding area 111, the PCB211 and the nickel sheet 220 can be welded first, and then the PCB211 and the FPC212 can be welded.

[0035] Since the welding positions of PCB211 and FPC212 and the welding positions of PCB211 and nickel sheet 220 overlap, when welding PCB211 and FPC212, the high temperature generated by the welding will be transmitted to the welding position of nickel sheet 220 and PCB211, which may cause secondary tin melting on the soldering pads of nickel sheet 220 and PCB211, resulting in poor welding strength between nickel sheet 220 and PCB211, and even affecting the electrical performance of the battery.

[0036] Based on the above situation, the welding fixture 100 may also include a cooling mechanism 120, the cooling mechanism 120 is provided with a spraying part 121, the spraying part 121 is arranged opposite to the positioning welding area 111, and the spraying part 121 is provided with an overflow port, through which a cooling medium can be sprayed to the positioning welding area 111 to cool down the welding position of the nickel sheet 220 and the PCB 211, thereby reducing the influence of the high temperature generated by welding on the welding strength of the nickel sheet 220. The cooling mechanism 120 may be an air cooling mechanism, a water cooling mechanism, etc., and the cooling medium sprayed by the spraying part 121 may be a gas or a liquid.

[0037] From the above, it can be seen that the welding jig 100 disclosed in the embodiment of the present application improves the relevant technology. When welding the protection plate body 210 in the positioning welding area 111, the injection part 121 can spray cooling medium to the positioning welding area 111 to appropriately reduce the temperature of the nickel sheet 220, which can effectively prevent the secondary tin melting phenomenon from occurring at the welding pads of the nickel sheet 220 and the protection plate body 210, thereby improving the welding strength between the nickel sheet 220 and the protection plate body 210, and further improving the electrical performance of the battery.

[0038] Furthermore, if Figures 1 to 5 , Fig.13 As shown, the positioning mechanism 110 may include a base plate 112 and a cover plate 113, and the base plate 112 and the cover plate 113 may be switched between an unfolded state and a folded state. When placing the battery cell protection plate assembly 200, the base plate 112 and the cover plate 113 may be controlled to be in an unfolded state first. After the battery cell protection plate assembly 200 is placed in the positioning welding area 111, the base plate 112 and the cover plate 113 may be controlled to be in a folded state. Under the further limiting effect of the cover plate 113, the battery cell protection plate assembly 200 may be prevented from shaking or deflecting on the base plate 112.

[0039] The bottom plate 112 and the cover plate 113 can be switched between the unfolded state and the folded state in a detachable manner. When the cover plate 113 is separated from the bottom plate 112, it is in the unfolded state. When the cover plate 113 is engaged with the bottom plate 112, it is in the folded state. The bottom plate 112 and the cover plate 113 can also be switched between the unfolded state and the folded state by a rotation connection. Specifically, Fig.13As shown, a shaft rod 114 may be provided on one of the bottom plate 112 and the cover plate 113, and a shaft sleeve 115 may be provided on the other, and the shaft sleeve 115 may be sleeved on the shaft rod 114, so that the bottom plate 112 and the cover plate 113 can rotate relative to each other around the axial direction of the shaft rod 114 to achieve folding and unfolding. In addition, the bottom plate 112 and the cover plate 113 may be connected by a flexible member, and a rotation connection may also be achieved.

[0040] like Figures 1 to 5 , Fig.13 As shown, the cover plate 113 is also provided with an operation hole 1131, and the positioning welding area 111 is provided on the bottom plate 112. The operation hole 1131 is arranged opposite to the positioning welding area 111. The welding device can extend into the positioning welding area 111 through the operation hole 1131, and weld the battery cell protection board assembly 200. It should be noted that the welding device welds the PCB 211 and the FPC 212 from one side of the cover plate 113 through the operation hole 1131; for the welding process of the PCB 211 and the nickel sheet 220, the welding can be completed before the battery cell protection board assembly 200 is placed in the positioning welding area 111, or the PCB 211 and the nickel sheet 220 can be welded from the side close to the bottom plate 112 by using the welding device. When this welding method is adopted, it is necessary to set an avoidance hole 1122 corresponding to the positioning welding area 111 on the bottom plate 112 for the welding device to pass through.

[0041] The cooling mechanism 120 may be an air cooling mechanism or a water cooling mechanism. When a water cooling mechanism is adopted, the spraying part 121 may spray a cooling liquid onto the bottom plate 112 to achieve cooling, and the cooling liquid is circulated and transmitted through the water cooling pipeline.

[0042] When using air cooling mechanism, Figures 1 to 9 As shown, the cooling mechanism 120 may include a base 122, a compressed gas source (not shown in the figure) and an air-cooling pipeline 123. The base 122 is the installation base of the cooling mechanism 120. The shape of the base 122 may be a rectangular parallelepiped, a truncated cone, etc. The base 122 is arranged on the side of the bottom plate 112 facing away from the cover plate 113. The base 122 and the bottom plate 112 may overlap and contact each other, or they may be separated by a certain distance, as long as it does not affect the injection part 121 to spray cooling gas to the positioning welding area 111.

[0043] The air cooling pipeline 123 is disposed on the base 122 and is connected to a compressed gas source, which can provide cooling gas for the air cooling pipeline 123 and provide circulation power for the gas in the air cooling pipeline 123. The injection unit 121 is connected to the air cooling pipeline 123, and the cooling gas provided by the compressed gas source is transmitted to the injection unit 121 through the air cooling pipeline 123, and is injected by the injection unit 121 to the positioning welding area 111 to achieve cooling.

[0044] In order to improve the cooling efficiency of the cooling mechanism 120, Figures 1 to 5, Fig.13 As shown, the bottom plate 112 can be provided with an avoidance hole 1122 at the positioning welding area 111, and the injection part 121 is arranged opposite to the avoidance hole 1122, so that the cooling gas injected by the injection part 121 can directly pass through the avoidance hole 1122 and reach the welding position of the nickel sheet 220 and the PCB 211 for cooling. In addition, the avoidance hole 1122 can also provide a placement space for the nickel sheet 220, so that the welding device can weld the nickel sheet 220 and the PCB 211 through the avoidance hole 1122.

[0045] Since the battery cell has two positive and negative poles, when the battery cell protection board assembly 200 is connected to the battery cell, the number of nickel sheets 220 is also two, and the two nickel sheets 220 are arranged on the first board surface of PCB211 at intervals. Correspondingly, the number of the above-mentioned avoidance holes 1122 is also two, and the two avoidance holes 1122 are respectively used to accommodate the nickel sheets 220. The injection part 121 also includes two nozzles 1211, and the nozzles 1211 and the avoidance holes 1122 are arranged one by one, so that the two nickel sheets 220 can be cooled down respectively, thereby further improving the cooling efficiency.

[0046] In order to achieve flexible control of the cooling mechanism 120, such as Figures 7 to 12 As shown, the cooling mechanism 120 may further include a switch assembly 124, which is connected to the air cooling pipeline 123 between the compressed air source and the injection part 121. By controlling the state of the switch assembly 124, the injection part 121 can be controlled to be turned on or off. The switch assembly 124 may be a mechanical switch or an electrically controlled switch, which is not limited in the embodiment of the present application.

[0047] Furthermore, if Figures 7 to 12 As shown, the cooling mechanism 120 may further include a flow regulating valve 125, which is connected to the air cooling pipeline 123 between the compressed air source and the injection part 121, and controls the injection flow of the injection part 121 by operations such as rotation and pressing, so as to accurately control the cooling process.

[0048] like Figure 11 to Figure 12 As shown, the above-mentioned switch assembly 124 can specifically include a switch body 1241, a pressure ring 1242 and a guide tube 1243. The switch body 1241 can be in the shape of a cylinder, a rectangular parallelepiped, etc. A hollow area is provided inside the switch body 1241. The guide tube 1243 is provided in the hollow area inside the switch body 1241, and both ends of the guide tube 1243 are positioned inside the switch body 1241.

[0049] The base 122 is provided with a mounting groove 1221, the switch body 1241 is provided in the mounting groove 1221 and is slidably connected with the mounting groove 1221, and the pressing ring 1242 is provided at the notch of the mounting groove 1221 and is snap-fitted with the mounting groove 1221 to restrict the switch body 1241 in the mounting groove 1221 and prevent the switch body 1241 from falling out of the mounting groove 1221. There is a first relative position and a second relative position between the switch body 1241 and the mounting groove 1221, and the switch body 1241 can slide relative to the mounting groove 1221 by pressing, and switch between the first relative position and the second relative position.

[0050] When the switch body 1241 and the mounting groove 1221 are in a first relative position, both ends of the flow guide tube 1243 are respectively connected to the air cooling pipeline 123, and the cooling gas generated by the compressed gas source can be smoothly transmitted to the injection part 121 through the air cooling pipeline 123; when the switch body 1241 and the mounting groove 1221 are in a second relative position, at least one end of the flow guide tube 1243 is disconnected from the air cooling pipeline 123 to block the gas passage between the compressed gas source and the injection part 121, thereby closing the injection part 121. It should be noted that the two ends of the flow guide tube 1243 are respectively spliced ​​with the air cooling pipeline 123 to form a gas passage. When at least one end of the flow guide tube 1243 is disconnected from the air cooling pipeline 123, the gas passage is disconnected. When the switch body 1241 is pressed, the splicing point between the flow guide tube 1243 and the air cooling pipeline 123 is misaligned, and the port of the air cooling pipeline 123 abuts against the side wall of the switch body 1241, and the port of the flow guide tube 1243 abuts against the side wall of the mounting groove 1221, thereby blocking the gas passage.

[0051] like Figure 11 to Figure 12 As shown, when a push-type switch body 1241 is used, the switch assembly 124 may further include an elastic member 1244. A guide column 1245 is provided at one end of the switch body 1241 facing the bottom of the mounting groove 1221. A guide hole 1222 is provided at the bottom of the mounting groove 1221. The guide column 1245 extends into the guide hole 1222. The elastic member 1244 is sleeved on the guide column 1245 and elastically supported between the switch body 1241 and the bottom of the guide hole 1222. The elastic member 1244 may be a material capable of storing elastic potential energy, such as a metal spring, a rubber member, or a silicone member. Under the elastic force support of the elastic member 1244, the switch body 1241 may be in the first relative position to ensure stable conduction of the gas path. The user may overcome the elastic force of the elastic member 1244 by pressing the switch body 1241, so that the switch body 1241 moves toward the inside of the mounting groove 1221, thereby disconnecting the gas path.

[0052] like Figure 11 to Figure 12As shown, in order to prevent the switch body 1241 from excessively extending into the mounting groove 1221 and causing damage to components such as the elastic member 1244 and the guide column 1245, a limiting protrusion 1246 can be provided on the side of the switch body 1241, and a limiting platform 1223 can be provided on the side wall of the mounting groove 1221. When the switch body 1241 and the mounting groove 1221 are in the second relative position, the limiting protrusion 1246 abuts against the limiting platform 1223, thereby limiting the switch body 1241 from sliding further into the mounting groove 1221.

[0053] In an optional embodiment of the present application, Figures 1 to 5 , Figures 7 to 10 , Fig.13 As shown, in order to improve welding efficiency, the bottom plate 112 may be provided with at least two positioning welding areas 111, which can simultaneously place at least two battery cell protection board assemblies 200, so as to facilitate batch welding of the battery cell protection board assemblies 200. When the air cooling pipeline 123 is arranged, the air cooling pipeline 123 may include a main pipeline 1231 and a branch pipeline 1232, the main pipeline 1231 is connected to the compressed gas source, the number of branch pipelines 1232 may be multiple, and they are respectively connected to the main pipeline 1231, the injection part 121 is connected to the branch pipeline 1232, and the number of branch pipelines 1232 and the injection part 121 is equal to the number of the positioning welding areas 111 and corresponds one to one.

[0054] like Fig.10 As shown, the main pipeline 1231 and the branch pipeline 1232 can be arranged on the surface of the base 122. In an optional embodiment of the present application, a pipeline installation space can be reserved inside the base 122, and at least part of the main pipeline 1231 and the branch pipeline 1232 can be buried in the base 122 to improve the consistency and aesthetics of the base 122. A mounting hole 1224 can be set at a position where the base 122 and the branch pipeline 1232 are opposite, and the injection part 121 is set in the mounting hole 1224 and communicated with the branch pipeline 1232.

[0055] like Figures 1 to 9 As shown, the base 122 of the cooling mechanism 120 and the bottom plate 112 of the positioning mechanism 110 can be overlapped and in contact with each other. In order to enable the injection portion 121 of the cooling mechanism 120 to be accurately aligned with the positioning welding area 111 and the avoidance hole 1122, a positioning portion 1225 can be provided at a position close to the edge of the base 122. The positioning portion 1225 can be a step structure. The positioning portion 1225 of the step structure can be positioned and cooperated with the edge of the bottom plate 112, so that the bottom plate 112 can be accurately placed at the preset position of the base 122.

[0056] In some optional embodiments, such as Fig.13As shown, the positioning welding area 111 may be a positioning groove 1121, and the contour of the positioning groove 1121 matches the shape of the battery cell protection board assembly 200, so that the battery cell protection board assembly 200 can be accommodated and positioned. The bottom of the positioning groove 1121 is provided with the above-mentioned avoidance hole 1122. When placing the battery cell protection board assembly 200, the first board surface on which the PCB 211 is placed can be fitted with the bottom of the positioning groove 1121, the nickel sheet 220 is accommodated in the avoidance hole 1122, and the FPC 212 is placed on the second board surface of the PCB 211. The positioning groove 1121 can also position the FPC 212, so that the positions of the FPC 212 and the PCB 211 are also relatively fixed.

[0057] The welding device needs to extend into the positioning welding area 111 through the operation hole 1131 on the cover plate 113 to weld the FPC 212 and the PCB 211. If the operation hole 1131 and the positioning welding area 111 are not accurately aligned, the normal welding process will be affected. In order to improve the alignment accuracy of the operation hole 1131 and the positioning welding area 111, as shown in FIG. Fig.13 As shown, a positioning column 116 may be provided on one of the bottom plate 112 and the cover plate 113 , and a positioning hole 117 may be provided on the other. The cover plate 113 and the bottom plate 112 may be assembled and positioned by plugging and fitting the positioning column 116 into the positioning hole 117 .

[0058] The bottom plate 112 and the cover plate 113 can be made of metal materials. In order to improve the stability of the bottom plate 112 and the cover plate 113 in the folded state, Fig.13 As shown, a magnetic member 118 can be provided on at least one of the base plate 112 and the cover plate 113 , and the base plate 112 and the cover plate 113 can be attracted to each other through the magnetic member 118 , thereby preventing the base plate 112 and the cover plate 113 from being accidentally unfolded, thereby improving the reliability of the positioning mechanism 110 .

[0059] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. Considering the simplicity of the text, they will not be repeated here.

[0060] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A welding jig for a battery cell protection plate assembly, wherein the battery cell protection plate assembly (200) comprises a protection plate body (210) and a nickel sheet (220), wherein the protection plate body (210) and the nickel sheet (220) are welded, characterized in that: The welding jig (100) comprises a positioning mechanism (110) and a cooling mechanism (120); The positioning mechanism (110) is provided with a positioning welding area (111), and the positioning welding area (111) is used to accommodate the battery core protection plate assembly (200); The cooling mechanism (120) comprises a spraying portion (121), wherein the spraying portion (121) is arranged opposite to the positioning welding area (111) and is used for spraying a cooling medium toward the positioning welding area (111).

2. The welding jig according to claim 1, characterized in that: The positioning mechanism (110) comprises a bottom plate (112) and a cover plate (113), and the bottom plate (112) and the cover plate (113) can be switched between an unfolded state and a folded state; The positioning welding area (111) is arranged on the bottom plate (112), and the cover plate (113) is provided with an operation hole (1131), and the operation hole (1131) is arranged opposite to the positioning welding area (111).

3. The welding jig according to claim 2, characterized in that: The cooling mechanism (120) comprises a base (122), a compressed air source and an air cooling pipeline (123); The base (122) is arranged on a side of the bottom plate (112) facing away from the cover plate (113); the air cooling pipeline (123) is arranged on the base (122) and is connected to the compressed gas source; the injection portion (121) is connected to the air cooling pipeline (123) and is used to inject cooling gas to the positioning welding area (111).

4. The welding jig according to claim 3, characterized in that: The bottom plate (112) is provided with an avoidance hole (1122) at the positioning welding area (111), and the injection portion (121) is arranged opposite to the avoidance hole (1122).

5. The welding jig according to claim 4, characterized in that: The number of the avoidance holes (1122) is two, and the two avoidance holes (1122) are respectively used to accommodate the nickel sheet (220). The injection portion (121) comprises two nozzles (1211), and the nozzles (1211) are arranged in a one-to-one correspondence with the avoidance holes (1122).

6. The welding jig according to claim 3, characterized in that: The cooling mechanism (120) further comprises a switch assembly (124), wherein the switch assembly (124) is connected to the air cooling pipeline (123) between the compressed air source and the injection part (121) and is used to control the opening or closing of the injection part (121).

7. The welding jig according to claim 3, characterized in that: The cooling mechanism (120) further comprises a flow regulating valve (125), wherein the flow regulating valve (125) is connected to the air cooling pipeline (123) between the compressed air source and the injection part (121) and is used to control the injection flow of the injection part (121).

8. The welding jig according to claim 6, characterized in that: The switch assembly (124) comprises a switch body (1241), a pressure ring (1242) and a flow guide tube (1243), wherein the flow guide tube (1243) is arranged in the switch body (1241); The base (122) is provided with a mounting groove (1221), the switch body (1241) is arranged in the mounting groove (1221) and is slidably connected to the mounting groove (1221), and the pressure ring (1242) is arranged at the notch of the mounting groove (1221); When the switch body (1241) and the mounting groove (1221) are in a first relative position, both ends of the flow guide tube (1243) are respectively connected to the air cooling pipeline (123); when the switch body (1241) and the mounting groove (1221) are in a second relative position, at least one end of the flow guide tube (1243) is disconnected from the air cooling pipeline (123) to block the gas passage between the compressed gas source and the injection part (121).

9. The welding jig according to claim 8, characterized in that: The switch assembly (124) further comprises an elastic member (1244); a guide column (1245) is provided at one end of the switch body (1241) facing the bottom of the installation groove (1221); a guide hole (1222) is provided at the bottom of the installation groove (1221); the guide column (1245) extends into the guide hole (1222); the elastic member (1244) is sleeved on the guide column (1245) and elastically supported between the switch body (1241) and the bottom of the guide hole (1222).

10. The welding jig according to claim 8, characterized in that: A limiting protrusion (1246) is provided on the side of the switch body (1241), and a limiting platform (1223) is provided on the side wall of the installation groove (1221); when the switch body (1241) and the installation groove (1221) are in the second relative position, the limiting protrusion (1246) abuts against the limiting platform (1223).

11. The welding jig according to claim 3, characterized in that: The base plate (112) is provided with at least two positioning welding areas (111); the air cooling pipeline (123) comprises a main pipeline (1231) and a branch pipeline (1232); the main pipeline (1231) is connected to the compressed air source; the branch pipeline (1232) is connected to the main pipeline (1231); the injection part (121) is connected to the branch pipeline (1232); the number of the branch pipelines (1232) and the injection part (121) is equal to the number of the positioning welding areas (111) and corresponds one to one.

12. The welding jig according to claim 11, characterized in that: At least part of the main pipeline (1231) and the branch pipeline (1232) are buried in the base (122); the base (122) is provided with a mounting hole (1224); the injection portion (121) is provided in the mounting hole (1224) and is connected to the branch pipeline (1232).

13. The welding jig according to claim 2, characterized in that: The positioning welding area (111) is a positioning groove (1121) provided on the bottom plate (112), and the positioning groove (1121) is used to accommodate the battery cell protection plate assembly (200).

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