Flexible lithium battery tab welding tool

Abstract

The invention relates to the technical field of lithium battery assembly, in particular to a flexible lithium battery tab welding tool which comprises a placing frame, a back plate, a plurality of tab pressing sets and a pressure adjusting piece, the back plate is detachably assembled at one end of the placing frame, the placing frame is at least provided with two horizontal cross beams which are vertically arranged at intervals, and horizontal sliding grooves are formed in the horizontal cross beams; the end of the pressure adjusting piece is assembled in the horizontal sliding groove in a sliding mode, the pressing lug set is connected to the horizontal cross beam in a sliding mode in the X-axis direction, the pressing lug set is in a long strip shape and arranged in the Z-axis direction, the pressing lug set is connected to the horizontal cross beam through the pressure adjusting piece, the pressure adjusting piece is arranged in the Y-axis direction, and the pressure adjusting piece is used for driving the pressing lug set to be close to or away from the back plate. A welding channel used for welding is arranged on the lug pressing set, and a pressure sensing unit is arranged in the lug pressing set. By means of the electrode lug pressing device, workers or welding equipment can conveniently and rapidly know whether electrode lugs are pressed in place or not, and follow-up welding quality and welding efficiency can be improved.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery assembly, and particularly to a flexible lithium battery tab welding tooling. Background Art

[0002] A battery module is a module that realizes specific voltage and current transmission through the series and parallel connection of multiple single cells. Usually, the series and parallel connection of battery cells is achieved through welding, including welding methods such as laser welding or ultrasonic welding. The welding effect affects the electrical performance and safety of the battery module. To ensure the safety and stable performance of the battery module, it is very important to ensure the welding effect of the lithium battery tabs. Moreover, strict pressing is required for tab welding to ensure that no welding defects occur. Therefore, the welding tooling is an essential auxiliary tool in the lithium battery welding and assembly process.

[0003] After retrieval, Chinese Patent No. CN202110541758.6 discloses a lithium battery module welding tooling, which includes a base plate, and a bottom positioning structure is provided on the base plate; a top positioning plate is provided above the base, and a top positioning groove adapted to the top shape of the grouped lithium batteries is provided on the bottom surface of the top positioning plate; a vertically penetrating conductive bar placement groove is provided on the top positioning plate, and a conductive bar positioning structure is provided on the top positioning plate, and the conductive bar positioning structure is used to position the conductive bar so that the conductive bar and the pole columns of the grouped lithium batteries are arranged vertically opposite; the welding tooling further includes a conductive bar pressing plate assembly and a pressing structure. The conductive bar pressing plate assembly includes a conductive bar pressing block located at the bottom for pressing the conductive bar. A welding channel corresponding to each pole column and the conductive bar positioning groove is provided on the conductive bar pressing plate assembly during use, and the welding channel is for a laser or a laser welding head to pass through; the pressing structure is used to press the conductive bar pressing plate assembly against the conductive bar.

[0004] Regarding the above related technologies, the inventor believes that there are the following technical defects to be improved:

[0005] During the use of common welding tooling, generally, the staff manually adjusts the pressing force on the tabs. If the pressing force on the tabs is too large, it is easy to cause the tabs to bend or be damaged. If the pressing force on the tabs is too small, it is easy to cause problems such as the tabs becoming loose and the welding being unreliable. This defect of being unable to timely know whether the tabs are pressed in place greatly affects the welding quality and welding efficiency. Summary of the Invention

[0006] This application provides a flexible lithium battery tab welding tooling to improve the following technical problems:

[0007] During the use of common welding tooling, the defect of being unable to timely know whether the tabs are pressed in place greatly affects the welding quality and welding efficiency.

[0008] The present application provides a flexible lithium battery tab welding tooling, adopting the following technical solutions:

[0009] A flexible lithium battery tab welding tooling, comprising a placement frame, a back plate, several groups of tab pressing groups and a pressure regulating member. A chamber for placing the battery module to be welded is arranged inside the placement frame. The back plate is detachably assembled at one end of the placement frame to block the back of the battery module to be welded. At least two horizontally spaced horizontal crossbeams are arranged on the placement frame. Horizontal sliding grooves are arranged on the horizontal crossbeams. The end of the pressure regulating member is slidably assembled in the horizontal sliding grooves. The tab pressing groups are slidably connected to the horizontal crossbeams along the X-axis direction. The tab pressing groups are strip-shaped and arranged along the Z-axis direction. The tab pressing groups are connected to the horizontal crossbeams through one or more of the pressure regulating members. The pressure regulating members are arranged along the Y-axis direction. The pressure regulating members are used to drive the tab pressing groups to approach or move away from the back plate. The tab pressing groups are used to provide a pressing force for pressing the tabs on the battery module to be welded. Welding channels for welding are arranged on the tab pressing groups.

[0010] A pressure sensing unit is arranged inside the tab pressing group. The pressure sensing unit is used to directly or indirectly feedback the magnitude of the pressing force of the tab pressing group on the tabs. A control display screen electrically connected to the pressure sensing unit is arranged outside the placement frame. The control display screen is used to display and record the pressing force value in real time. A standard pressure threshold is also preset in the processor of the control display screen. When the pressing force value exceeds the standard pressure threshold, the control display screen starts an alarm mode.

[0011] In a feasible technical solution of the present application, the tab pressing group includes an outer frame and an elastic pressing assembly. Threaded holes are respectively arranged at the top and bottom of the outer frame. The pressure regulating member is threadedly connected and penetrates through the threaded holes. An installation hole is arranged in the middle of the outer frame. The elastic pressing assembly is fixed in the installation hole and is used to press the tabs on the battery module to be welded.

[0012] In a feasible technical solution of the present application, the pressure regulating member includes a threaded rod, a butterfly handle and a limiting block. The threaded rod is threadedly assembled in the threaded hole. The butterfly handle is fixed to the outer end of the threaded rod. The inner end of the threaded rod is rotatably connected and perpendicular to the limiting block to form a T-shaped structure. The cross-section of the horizontal sliding groove is a T-shape adapted to the T-shaped structure. A notch communicating with the horizontal sliding groove is arranged on the horizontal crossbeam. The notch is used for the T-shaped structure to enter and exit.

[0013] In an implementable technical solution of the present application, the elastic pressing assembly includes a fixed seat, a pressing part, and an elastic connecting member. The outer shape of the fixed seat is adapted to the mounting hole. A sliding hole is provided in the middle of the fixed seat. The pressing part is slidably assembled in the sliding hole along the Y-axis direction. The elastic connecting member is arranged between the top / bottom of the pressing part and the fixed seat. The elastic force of the elastic connecting member is used to drive the pressing part to always approach the horizontal cross beam. The welding channel is arranged in the middle of the pressing part.

[0014] In an implementable technical solution of the present application, the pressing part includes a square box, two ear plates, and a conical surface mouth-binding box. One of the ear plates is vertically fixed to the top of the square box and is used for connecting one group of the elastic connecting members. The other ear plate is vertically fixed to the bottom of the square box and is used for connecting the other group of the elastic connecting members. The outer end of the conical surface mouth-binding box communicates with the inner end of the square box. The conical surface mouth-binding box includes a first inclined plate, a second inclined plate, and a rectangular long pressing plate. The distance between the first inclined plate and the second inclined plate gradually decreases from the outside to the inside. The rectangular long pressing plate is fixed to the inner ends of the first inclined plate and the second inclined plate. The rectangular long pressing plate is used to contact and press the pole ears on the battery module to be welded. Welding holes for forming the welding channel are provided on the rectangular long pressing plate. The welding holes are in a long strip shape and a partition plate is arranged in the middle.

[0015] In an implementable technical solution of the present application, the elastic connecting member includes a connecting bolt, a spring, and a plurality of limit nuts. The connecting bolt penetrates through the fixed seat. The limit nuts are threadedly assembled at the inner end of the connecting bolt. The connecting bolt slidably penetrates through the ear plate. The spring is sleeved on the connecting bolt. The spring is clamped between the ear plate and the fixed seat.

[0016] In an implementable technical solution of the present application, the pressure sensing unit is an annular pressure sensor. The annular pressure sensor is arranged between the spring and the ear plate. The connecting bolt penetrates through the annular pressure sensor. The annular pressure sensor is used to monitor the extrusion force value of the spring on the ear plate. The extrusion force value is used to indirectly replace the pressing force value.

[0017] In an implementable technical solution of the present application, fixing plates are vertically connected to both the top and the bottom of the fixed seat. A sunk groove adapted to the fixing plate is provided on the front surface of the outer frame. The fixing plate is locked in the sunk groove by a plurality of screws.

[0018] In an implementable technical solution of the present application, the placement frame is of a cuboid structure and includes a bottom plate, two side plates, and four horizontal crossbeams. The two side plates are fixed to opposite sides of the bottom plate by bolts. The two side plates are arranged in parallel and are square-shaped. The two ends of the horizontal crossbeam are respectively vertically connected to the corners of the two side plates by bolts.

[0019] In an implementable technical solution of the present application, vertical insertion slots are provided at the front and rear ends of the side plates, and the back plate is detachably assembled in the insertion slots.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] When the staff uses the operating pressure regulating member to change the magnitude of the elastic pressing force, the pressure sensing unit and the control display screen cooperate to change the traditional method of judging whether it is pressed by hand feeling into a method of accurately detecting the pressure and displaying the magnitude of the pressing force on the display screen, so as to facilitate the staff or the welding equipment to quickly know whether the tab is pressed in place. When the pressing force value exceeds the standard pressure value, the control display screen starts the alarm mode to warn that the subsequent tab welding work cannot be carried out, which is beneficial to improving the subsequent welding quality and welding efficiency;

[0022] According to the size and tab position of the battery module to be welded, the position of the tab pressing group can be horizontally moved, and the number of tab pressing groups can be adaptively increased according to the assembly needs. Then, through the pressure regulating member, the pressing force of the tab pressing group on the tab of the battery module to be welded can be adjusted to ensure a better welding effect. The whole tooling not only has a simple structure and is convenient to manufacture, but also is convenient for placing and removing the battery module to be welded, easy to adjust, and can better meet the tab welding requirements of different specifications of battery modules. There is no need to design a separate welding tooling for different specifications of battery modules, and single tab welding or multiple tabs can be welded simultaneously, which can meet the requirements of various welding equipment and processes, and reduce the R & D time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a flexible lithium battery tab welding tooling according to an embodiment of the present application.

[0025] Figure 2 It is a schematic structural diagram of a tab pressing group and a pressure regulating member in an embodiment of the present application.

[0026] Figure 3 It is a schematic structural diagram of the elastic pressing component in the embodiment of the present application.

[0027] Figure 4 It is a schematic structural diagram of the pressing part in the embodiment of the present application.

[0028] Explanation of reference numerals:

[0029] 1. Placing frame; 11. Horizontal cross beam; 111. Horizontal sliding groove; 112. Notch; 12. Bottom plate; 13. Side plate; 131. Insertion slot

[0030] 2. Back plate

[0031] 3. Ear pressing group; 300. Welding channel; 31. Outer frame; 311. Threaded hole; 312. Mounting hole; 313. Sunk groove; 32. Elastic pressing component; 321. Fixed seat; 3211. Sliding hole; 3212. Fixed plate; 322. Pressing part; 3221. Square box; 3222. Ear plate; 3223. First inclined plate; 3224. Second inclined plate; 3225. Rectangular long strip pressing plate; 32251. Welding hole; 32252. Partition plate; 323. Elastic connecting piece; 3231. Connecting bolt; 3232. Spring; 3233. Limit nut

[0032] 4. Pressure regulating part; 41. Threaded rod; 42. Butterfly handle; 43. Limit block

[0033] 5. Pressure sensing unit

[0034] 6. Control display screen Detailed implementation manners

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0039] The following will further elaborate on the present application in conjunction with the attached Figures 1-4 drawings.

[0040] An embodiment of the present application discloses a flexible lithium battery tab welding tooling. Referring to Figures 1-4 , the flexible lithium battery tab welding tooling includes a placement frame 1, a back plate 2, several groups of tab pressing groups 3 and a pressure regulating member 4. In this embodiment, the tab pressing group 3 is preferably two groups. A chamber for placing the battery module to be welded is provided inside the placement frame 1. The back plate 2 is detachably assembled at one end of the placement frame 1 to block the back of the battery module to be welded. At least two horizontally spaced horizontal crossbeams 11 are provided on the placement frame 1. A horizontal chute 111 is provided on the horizontal crossbeam 11. The end of the pressure regulating member 4 is slidably assembled in the horizontal chute 111. The tab pressing group 3 is slidably connected to the horizontal crossbeam 11 along the X-axis direction. The tab pressing group 3 is in a long strip shape and is arranged along the Z-axis direction. The tab pressing group 3 is connected to the horizontal crossbeam 11 through one or more pressure regulating members 4. The pressure regulating member 4 is arranged along the Y-axis direction. The pressure regulating member 4 is used to drive the tab pressing group 3 to approach or move away from the back plate 2. The tab pressing group 3 is used to provide a pressing force for pressing the upper tabs of the battery module to be welded. A welding channel 300 for welding is provided on the tab pressing group 3;

[0041] A pressure sensing unit 5 is provided inside the tab pressing group 3. The pressure sensing unit 5 is used to directly or indirectly feedback the magnitude of the pressing force of the tab pressing group 3 on the tabs. A control display screen 6 electrically connected to the pressure sensing unit 5 is provided on the outside of the placement frame 1. The control display screen 6 is an integrated computer screen with a computer processor. The control display screen 6 is used to display and record the pressing force value in real time. A standard pressure threshold is also preset in the processor of the control display screen 6. When the pressing force value exceeds the standard pressure threshold, the control display screen 6 starts an alarm mode to warn that the subsequent tab welding work cannot be carried out.

[0042] In this embodiment, the ear pressing group 3 includes an outer frame 31 and an elastic pressing assembly 32. Threaded holes 311 are respectively provided at the top and bottom of the outer frame 31. The pressure regulating member 4 is threadedly connected and penetrates through the threaded holes 311. An installation hole 312 is provided in the middle of the outer frame 31. The elastic pressing assembly 32 is fixed in the installation hole 312 and is used to press the ear of the battery module to be welded. The ear pressing group 3 designed as above can not only maintain good structural strength through the outer frame 31, so that the outer frame 31 can cooperate with the pressure regulating member 4 to complete the adjustment and locking purposes, but also the elastic pressing assembly 32 can effectively avoid rigid contact with the ear, and has a certain protective effect on the ear of the battery module. Since the pressure regulating member 4 can drive the outer frame 31 to move a certain distance in the Y-axis direction through the screwing operation mode, the pressing force on the ear can be appropriately adjusted.

[0043] In this embodiment, the pressure regulating member 4 includes a threaded rod 41, a butterfly handle 42 and a limiting block 43. The threaded rod 41 is threadedly assembled in the threaded hole 311. The butterfly handle 42 is fixed to the outer end of the threaded rod 41. The inner end of the threaded rod 41 is rotatably connected and perpendicular to the limiting block 43 and forms a T-shaped structure. The cross-section of the horizontal chute 111 is a T-shape adapted to the T-shaped structure. A notch 112 communicating with the horizontal chute 111 is provided on the horizontal crossbeam 11. The notch 112 is used for the T-shaped structure to enter and exit. The pressure regulating member 4 and the horizontal crossbeam 11 designed as above have a simple and firm structure and are convenient to assemble. Moreover, the limiting block 43 can be fixed in the Y-axis direction and slide in the X-axis direction in the horizontal chute 111, and the adjustment operation is relatively convenient and the connection is relatively stable.

[0044] In this embodiment, the elastic pressing assembly 32 includes a fixed seat 321, a pressing part 322 and an elastic connecting piece 323. The outer shape of the fixed seat 321 is adapted to the installation hole 312. A sliding hole 3211 is provided in the middle of the fixed seat 321. The pressing part 322 is slidably assembled in the sliding hole 3211 along the Y-axis direction. The elastic connecting piece 323 is arranged between the top / bottom of the pressing part 322 and the fixed seat 321. The elastic force of the elastic connecting piece 323 is used to drive the pressing part 322 to always approach the horizontal crossbeam 11. The welding channel 300 is provided in the middle of the pressing part 322.

[0045] Among them, the pressing part 322 includes a square box 3221, two ear plates 3222 and a conical surface drawstring box. One of the ear plates 3222 is vertically fixed to the top of the square box 3221 and is used for connecting one set of elastic connectors 323, and the other ear plate 3222 is vertically fixed to the bottom of the square box 3221 and is used for connecting the other set of elastic connectors 323. The outer end of the conical surface drawstring box communicates with the inner end of the square box 3221. The conical surface drawstring box includes a first inclined plate 3223, a second inclined plate 3224 and a rectangular strip pressing plate 3225. The distance between the first inclined plate 3223 and the second inclined plate 3224 gradually decreases from the outside to the inside. The rectangular strip pressing plate 3225 is fixed to the inner ends of the first inclined plate 3223 and the second inclined plate 3224. The rectangular strip pressing plate 3225 is used to contact and press the ear tabs on the battery module to be welded. The rectangular strip pressing plate 3225 is provided with welding holes 32251 for forming a welding channel 300. The welding holes 32251 are in a strip shape and are provided with a partition plate 32252 in the middle.

[0046] Among them, the elastic connector 323 includes a connecting bolt 3231, a spring 3232 and a plurality of limit nuts 3233. The connecting bolt 3231 passes through the fixing seat 321, and the limit nut 3233 is threadedly assembled at the inner end of the connecting bolt 3231. The connecting bolt 3231 slidably passes through the ear plate 3222, and the spring 3232 is sleeved on the connecting bolt 3231. The spring 3232 is clamped between the ear plate 3222 and the fixing seat 321.

[0047] The elastic pressing assembly 32 designed above has a simple and firm structure. According to the welding requirements of the ear tabs, a welding channel 300 is formed in the middle for the laser or laser welding head in the welding equipment to pass through. The structural design of the elastic connector 323 can better provide the pressing force on the ear tabs for the pressing part 322, and the pressing and fixing effect on the ear tabs is better.

[0048] Specifically, the pressure sensing unit 5 is an annular pressure sensor. The annular pressure sensor is arranged between the spring 3232 and the ear plate 3222. The connecting bolt 3231 passes through the annular pressure sensor. The annular pressure sensor is used to monitor the extrusion force value of the spring 3232 on the ear plate 3222, and the extrusion force value is used to indirectly replace the pressing force value.

[0049] In this embodiment, in order to optimize the flatness of the front structure of the ear pressing group 3, fixing plates 3212 are vertically connected to both the top and the bottom of the fixing seat 321. A sinking groove 313 adapted to the fixing plates 3212 is provided on the front surface of the outer frame 31. The fixing plates 3212 are locked in the sinking groove 313 through a plurality of screws, so as to facilitate the firm connection between the fixing seat 321 and the outer frame 31.

[0050] In this embodiment, the placement frame 1 is a rectangular structure and includes a bottom plate 12, two side plates 13 and four horizontal beams 11. The two side plates 13 are fixed to the opposite sides of the bottom plate 12 by bolts. The two side plates 13 are arranged in parallel and are square in shape. The two ends of the horizontal beam 11 are vertically connected to the corners of the two side plates 13 by bolts respectively. The front and rear ends of the side plates 13 are provided with vertically arranged plug-in grooves 131, and the back plate 2 can be detachably assembled in the plug-in grooves 131.

[0051] The placement frame 1 designed as above has a simple and stable structure and a low manufacturing cost. It is convenient for taking out or placing the battery module to be welded from the cavity. Combined with the barrier and pressing effect of the back plate 2 and the pressure ear group 3 on the front and back of the battery module, it is beneficial to improve the stability of the battery module during welding. After welding, the back plate 2 can be pulled out of the plug-in slot 131, which makes the operation more convenient.

[0052] The beneficial technical effects of the flexible lithium battery tab welding tooling of the embodiment of the present application are roughly as follows:

[0053] When the staff uses the operating pressure regulating part 4 to change the size of the elastic clamping force, the pressure sensing unit 5 and the control display screen 6 work together to transform the traditional method of judging whether the clamping is done by hand into a method of accurately detecting the pressure and displaying the size of the clamping force on the display screen, thereby facilitating the staff or welding equipment to quickly know whether the tab is clamped in place. When the clamping force value exceeds the standard pressure value, the control display screen 6 activates the alarm mode to warn that subsequent tab welding work cannot be carried out, which is beneficial to improving subsequent welding quality and welding efficiency.

[0054] At the same time, according to the size and position of the tabs of the battery module to be welded, the position of the tab group 3 can be moved horizontally, and the number of tab groups 3 can be adaptively increased according to assembly requirements. Then, the pressure of the tab group 3 on the tabs on the battery module to be welded can be adjusted through the pressure regulating piece 4 to ensure a better welding effect. The entire tooling is not only simple in structure and easy to manufacture, but also convenient for taking and placing the battery modules to be welded and easy to adjust. It can better adapt to the tab welding requirements of battery modules of different specifications. There is no need to design separate welding tooling for battery modules of different specifications. It can also achieve single tab welding or simultaneous welding of multiple tabs, which can meet the needs of various welding equipment and processes and reduce R&D time and cost.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the protection scope of the present application.

Claims

1. A flexible lithium battery tab welding tooling, characterized in that, it includes a placement frame (1), a back plate (2), several groups of tab pressing groups (3) and a pressure regulating member (4). A chamber for placing the battery module to be welded is arranged in the placement frame (1). The back plate (2) is detachably assembled at one end of the placement frame (1) for blocking the back of the battery module to be welded. At least two horizontally arranged cross beams (11) are arranged on the placement frame (1) at intervals in the up and down direction. A horizontal sliding groove (111) is arranged on the horizontal cross beam (11). The end of the pressure regulating member (4) is slidably assembled in the horizontal sliding groove (111). The tab pressing group (3) is slidably connected to the horizontal cross beam (11) along the X-axis direction. The tab pressing group (3) is in a long strip shape and is arranged along the Z-axis direction. The tab pressing group (3) is connected to the horizontal cross beam (11) through one or more of the pressure regulating members (4). The pressure regulating member (4) is arranged along the Y-axis direction. The pressure regulating member (4) is used to drive the tab pressing group (3) to approach or move away from the back plate (2). The tab pressing group (3) is used to provide a pressing force for pressing the upper tabs of the battery module to be welded. A welding channel (300) is arranged on the tab pressing group (3); A pressure sensing unit (5) is arranged inside the tab pressing group (3). The pressure sensing unit (5) is used to directly or indirectly feedback the magnitude of the pressing force of the tab pressing group (3) on the tabs. A control display screen (6) electrically connected to the pressure sensing unit (5) is arranged on the outside of the placement frame (1). The control display screen (6) is used to display and record the pressing force value in real time. A standard pressure threshold is also preset in the processor of the control display screen (6). When the pressing force value exceeds the standard pressure threshold, the control display screen (6) starts an alarm mode.

2. The flexible lithium battery tab welding tooling according to claim 1, characterized in that, the tab pressing group (3) includes an outer frame (31) and an elastic pressing assembly (32). Threaded holes (311) are respectively arranged at the top and bottom of the outer frame (31). The pressure regulating member (4) is threadedly connected and penetrates through the threaded holes (311). An installation hole (312) is arranged in the middle of the outer frame (31). The elastic pressing assembly (32) is fixed in the installation hole (312) and is used to press the tabs of the battery module to be welded.

3. The flexible lithium battery tab welding tooling according to claim 2, characterized in that, The pressure regulating member (4) includes a threaded rod (41), a butterfly handle (42) and a limit block (43). The threaded rod (41) is threadedly assembled in the threaded hole (311). The butterfly handle (42) is fixed to the outer end of the threaded rod (41). The inner end of the threaded rod (41) is rotatably connected and perpendicular to the limit block (43) to form a T-shaped structure. The cross-section of the horizontal chute (111) is in a T-shape adapted to the T-shaped structure. A notch (112) communicating with the horizontal chute (111) is provided on the horizontal crossbeam (11). The notch (112) is for the T-shaped structure to enter and exit.

4. The flexible lithium battery tab welding tooling according to claim 2, characterized in that the elastic pressing assembly (32) includes a fixed seat (321), a pressing part (322) and an elastic connecting member (323). The outer shape of the fixed seat (321) is adapted to the mounting hole (312). A sliding hole (3211) is provided in the middle of the fixed seat (321). The pressing part (322) is slidably assembled in the sliding hole (3211) along the Y-axis direction. The elastic connecting member (323) is arranged between the top / bottom of the pressing part (322) and the fixed seat (321). The elastic force of the elastic connecting member (323) is used to drive the pressing part (322) to always approach the horizontal crossbeam (11). The welding channel (300) is provided in the middle of the pressing part (322).

5. The flexible lithium battery tab welding tooling according to claim 4, characterized in that the pressing part (322) includes a square box (3221), two ear plates (3222) and a conical surface constriction box. One of the ear plates (3222) is vertically fixed to the top of the square box (3221) and is used for connecting one group of the elastic connecting members (323). The other ear plate (3222) is vertically fixed to the bottom of the square box (3221) and is used for connecting the other group of the elastic connecting members (323). The outer end of the conical surface constriction box communicates with the inner end of the square box (3221). The conical surface constriction box includes a first inclined plate (3223), a second inclined plate (3224) and a rectangular long pressing plate (3225). The distance between the first inclined plate (3223) and the second inclined plate (3224) gradually decreases from outside to inside. The rectangular long pressing plate (3225) is fixed to the inner ends of the first inclined plate (3223) and the second inclined plate (3224). The rectangular long pressing plate (3225) is used to contact and press the tabs on the battery module to be welded. A welding hole (32251) for forming the welding channel (300) is provided on the rectangular long pressing plate (3225). The welding hole (32251) is in a long strip shape and a partition plate (32252) is provided in the middle.

6. The flexible lithium battery tab welding tooling according to claim 5, characterized in that The elastic connecting member (323) includes a connecting bolt (3231), a spring (3232) and a plurality of limit nuts (3233). The connecting bolt (3231) penetrates through the fixed seat (321). The limit nuts (3233) are threadedly assembled at the inner end of the connecting bolt (3231). The connecting bolt (3231) slidably penetrates through the ear plate (3222). The spring (3232) is sleeved on the connecting bolt (3231), and the spring (3232) is clamped between the ear plate (3222) and the fixed seat (321).

7. The flexible lithium battery tab welding tooling according to claim 6, wherein, the pressure sensing unit (5) is an annular pressure sensor. The annular pressure sensor is arranged between the spring (3232) and the ear plate (3222). The connecting bolt (3231) penetrates through the annular pressure sensor. The annular pressure sensor is used to monitor the extrusion force value of the spring (3232) on the ear plate (3222), and the extrusion force value is used to indirectly replace the pressing force value.

8. The flexible lithium battery tab welding tooling according to claim 4, wherein, fixing plates (3212) are vertically connected to both the top and bottom of the fixed seat (321). A sinking groove (313) adapted to the fixing plates (3212) is provided on the front surface of the outer frame (31). The fixing plates (3212) are locked in the sinking groove (313) by a plurality of screws.

9. The flexible lithium battery tab welding tooling according to claim 1, wherein, the placement frame (1) is of a cuboid structure and includes a bottom plate (12), two side plates (13) and four horizontal cross beams (11). The two side plates (13) are fixed to opposite sides of the bottom plate (12) by bolts. The two side plates (13) are arranged in parallel and are square-shaped. The two ends of the horizontal cross beam (11) are respectively vertically connected to the corners of the two side plates (13) by bolts.

10. The flexible lithium battery tab welding tooling according to claim 8, wherein, insertion grooves (131) arranged vertically are provided at both the front end and the rear end of the side plate (13). The back plate (2) is detachably assembled in the insertion grooves (131).

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