Device for preventing tab of soft package lithium battery from being broken

Abstract

The utility model discloses a device for preventing a tab of a soft package lithium battery from being broken. The device comprises a mechanical turntable platform, a naked battery cell platform, a battery cell horizontal moving assembly, a battery cell pressing assembly and a battery cell pressing cylinder assembly, an ultrasonic welding head is arranged at a position where the mechanical turntable platform is matched with a tab of the naked battery cell; the battery cell pressing assembly drives a battery cell pressing plate at the end part of the battery cell pressing assembly to move through a battery cell pressing supporting rod so as to press the bare battery cell; during welding, the battery cell horizontal moving assembly pushes the bare battery cell to move towards one side of the ultrasonic welding head. According to the device, the battery cell horizontal moving assembly is used for driving the bare battery cell platform to horizontally move so that the battery cell tabs can be in a relaxed state, after the battery cell pressing assembly is used for pressing the bare battery cells, the ultrasonic welding machine works, the welding operation of the tabs is completed, due to the fact that horizontal movement of the bare battery cells is achieved in the early stage, stress at spot welding positions is eliminated, and the welding quality of the tabs is improved. The problem of breakage of multiple layers of tabs is effectively prevented, the cost is saved for battery cell production enterprises, and the yield of battery cells is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic welding production of soft-pack lithium-ion battery tabs, in particular to a device for preventing the tabs of soft-pack lithium-ion batteries from breaking. Background Art

[0002] As a high-performance rechargeable battery, lithium-ion batteries are widely used in mobile devices, electric vehicles, energy storage systems, etc. Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate and light weight. Lithium-ion power batteries provide power for new energy vehicles, and their endurance performance has attracted much attention from consumers.

[0003] Lithium battery modules may experience tab breakage during the manufacturing process. This anomaly is caused by the fact that the lithium battery tabs are made up of multiple layers of aluminum foil or copper foil. When the battery cell welds the multiple layers of tabs together, the characteristics of ultrasonic welding will cause the tabs to be pulled, resulting in the tab breakage of the battery cell. This makes it impossible for the battery cell to release the designed capacity, resulting in low battery cell capacity. This fracture phenomenon cannot be solved by existing ultrasonic welding technology, and subsequent testing cannot guarantee that products with broken tabs will be eliminated.

[0004] Therefore, based on the above technical problems, technicians in this field urgently need to develop a device to prevent the tabs of soft-pack lithium batteries from breaking. Utility Model Content

[0005] The purpose of the utility model is to provide a device to prevent the tabs of soft-pack lithium batteries from breaking. The device drives a bare cell platform to move horizontally through a cell moving cylinder to relax the cell tabs, thereby effectively preventing the multi-layer tabs from breaking during the tab ultrasonic welding process, saving costs for cell manufacturers and improving the cell yield rate.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a device for preventing a tab of a soft-pack lithium battery from breaking, the device comprising:

[0008] Mechanical turntable platform;

[0009] A bare cell platform integrated with the mechanical turntable platform, a bare cell is placed on the bare cell platform, and the tabs of the bare cell extend to the edge of the bare cell platform; and

[0010] Battery cell horizontal movement assembly, battery cell pressing assembly and battery cell pressing cylinder assembly;

[0011] An ultrasonic welding horn is arranged at the matching position between the mechanical turntable platform and the tab of the bare battery cell, and two ultrasonic welding horns are arranged in the vertical direction, and the space between the two ultrasonic welding horns is the welding operation space of the tab, and the tab can extend into the welding operation space;

[0012] The battery cell pressing assembly drives the battery cell pressing plate at the end thereof to move through the battery cell pressing support rod to press the bare battery cell;

[0013] During welding, the battery cell horizontal moving assembly pushes the bare battery cell to move toward one side of the ultrasonic welding welding head;

[0014] The battery cell pressing cylinder assembly cooperates with the end of the battery cell pressing support rod away from the battery cell pressing plate to release the pressing state of the bare battery cell.

[0015] Furthermore, the bare cell platform has a platform horizontal portion for placing the bare cell, and a platform vertical portion located on the platform horizontal portion close to one end of the cell horizontal moving assembly;

[0016] The battery cell horizontal moving assembly pushes the platform vertical portion to move in a horizontal direction to adjust the relative position of the bare battery cell and the ultrasonic welding horn.

[0017] Furthermore, the battery cell horizontal movement component includes:

[0018] a horizontal cylinder support arranged close to the bare cell platform, on which a cell moving cylinder is mounted, and a cylinder rod of the cell moving cylinder is connected to the vertical portion of the platform; and

[0019] A fixing device is located at one end of the horizontal cylinder support away from the bare cell platform.

[0020] Furthermore, the battery cell pressing assembly includes:

[0021] The battery cell pressing support rod, one end of which is connected to the fixing device, and the other end of which is fixed with the battery cell pressing plate by bolts; and

[0022] A limit spring mechanism connected between the battery core pressing support rod and the fixing device;

[0023] The battery cell pressing support rod drives the battery cell pressing plate to press the battery cell on the bare battery cell platform through the spring force of the limit spring mechanism.

[0024] Furthermore, the limit spring mechanism comprises:

[0025] A limit spring lower bracket provided on the fixing device; and

[0026] A limit spring upper bracket arranged on the battery core pressing support rod;

[0027] A limit spring is arranged between the limit spring lower bracket and the limit spring upper bracket;

[0028] The limit spring tightens the limit spring upper bracket to drive the battery cell pressing support rod to flip toward the bare battery cell side to press the bare battery cell.

[0029] Furthermore, one end of the battery cell pressing support rod that cooperates with the fixing device is provided with a battery cell thickness adjustment limit block and a battery cell pressing support rod limit block;

[0030] A through slot is provided at a position where the fixing device cooperates with the battery cell thickness adjustment limit block along the thickness direction of the fixing device, and the battery cell thickness adjustment limit block can extend into the through slot;

[0031] A notch groove is provided at the matching position between the fixing device and the battery cell clamping support rod limit block. When the battery cell clamping support rod flips toward the fixing device, the lower end of the battery cell clamping support rod limit block abuts against the inner wall of the notch groove to limit the flipping degree of the battery cell clamping support rod.

[0032] Furthermore, a cell thickness adjustment bolt is provided in the horizontal direction at the position where the fixing device cooperates with the through slot, and the cell thickness adjustment bolt can be screwed into the fixing device and contact the lower end surface of the cell thickness adjustment limit block;

[0033] The lower end surface of the battery cell thickness adjustment limit block is configured as an inclined surface structure, and the battery cell thickness adjustment bolt abuts against the inclined surface structure to fine-tune the height of the battery cell pressing plate of the battery cell pressing support rod by adjusting the extension length.

[0034] Furthermore, a positioning groove is provided on the upper surface of one end of the battery cell pressing support rod away from the battery cell pressing plate;

[0035] The battery cell pressing cylinder assembly comprises:

[0036] vertical cylinder brackets; and

[0037] A downward pressing cylinder integrated in the vertical cylinder bracket, the cylinder rod of the downward pressing cylinder extending toward the battery cell pressing support rod, and the cylinder rod of the downward pressing cylinder and the battery cell pressing support rod cooperate with the positioning groove;

[0038] The cylinder rod of the downward pressing cylinder extends out and pushes the battery cell pressing support rod to flip so as to drive the battery cell pressing plate away from the bare battery cell.

[0039] Furthermore, at least one group of the devices is arranged on the mechanical turntable platform.

[0040] In the above technical solution, the utility model provides a device for preventing the tab of a soft-pack lithium battery from breaking, which has the following beneficial effects:

[0041] When ultrasonically welding the battery cell tabs, the device of the utility model utilizes the ultrasonic welding welding head to clamp the tabs of the bare battery cell, and the battery cell horizontal moving component drives the bare battery cell platform to move horizontally to relax the battery cell tabs, and then utilizes the battery cell pressing component to press the bare battery cell and then perform the ultrasonic welding machine to complete the tab welding operation. Since the horizontal movement of the bare battery cell is achieved in the early stage, the stress at the spot welding point is eliminated, and the breakage problem of the multi-layer tabs is effectively prevented, thereby saving costs for battery cell production enterprises and improving the battery cell yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0043] Figure 1 A schematic diagram of the structure of a device for preventing a tab of a soft-pack lithium battery from breaking provided by an embodiment of the utility model;

[0044] Figure 2 A schematic diagram of the structure of a cell pressing assembly of a device for preventing a tab of a soft-pack lithium battery from breaking provided by an embodiment of the utility model;

[0045] Figure 3 A schematic diagram of the structure of a battery cell horizontal moving assembly of a device for preventing a soft-pack lithium battery tab from breaking provided by an embodiment of the utility model;

[0046] Figure 4 A schematic structural diagram of a cell pressing cylinder assembly of a device for preventing a soft-pack lithium battery tab from breaking provided in an embodiment of the utility model.

[0047] Description of reference numerals:

[0048] 1. Mechanical turntable platform; 101. Ultrasonic welding welding head;

[0049] 201, horizontal part of the platform; 202, vertical part of the platform; 203, bare battery cell; 204, tab;

[0050] 3. Horizontal cylinder bracket;

[0051] 301, horizontal cylinder bracket; 302, battery cell moving cylinder; 303, fixing device; 304, battery cell thickness adjustment bolt; 305, through slot; 306, notch slot;

[0052] 4. Battery cell pressing assembly;

[0053] 401, battery cell pressing support rod; 402, battery cell pressing plate; 403, limit spring lower bracket; 404, limit spring upper bracket; 405, limit spring; 406, battery cell thickness adjustment limit block; 407, battery cell pressing support rod limit block;

[0054] 5. Battery cell pressing cylinder assembly;

[0055] 501, vertical cylinder bracket; 502, downward pressure cylinder. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0057] See also Figures 1 to 4 As shown;

[0058] This embodiment discloses a device for preventing a tab of a soft-pack lithium battery from breaking, the device comprising:

[0059] Mechanical turntable platform 1;

[0060] A bare cell platform integrated on the mechanical turntable platform 1, on which a bare cell 203 is placed, and the tabs 204 of the bare cell 203 extend to the edge of the bare cell platform; and

[0061] Battery cell horizontal moving assembly 3, battery cell pressing assembly 4 and battery cell pressing cylinder assembly 5;

[0062] An ultrasonic welding horn 101 is provided at the matching position between the mechanical turntable platform 1 and the pole lug 204 of the bare battery cell 203, and two ultrasonic welding horns 101 are provided in the vertical direction, and the space between the two ultrasonic welding horns 101 is the welding operation space of the pole lug 204, and the pole lug 204 can extend into the welding operation space;

[0063] The battery cell pressing assembly 4 drives the battery cell pressing plate 402 at its end to move through the battery cell pressing support rod 401 to press the bare battery cell 203;

[0064] During welding, the battery cell horizontal moving assembly 3 pushes the bare battery cell 203 to move toward the side of the ultrasonic welding horn 101;

[0065] The cell pressing cylinder assembly 5 cooperates with the end of the cell pressing support rod 401 away from the cell pressing plate 402 to release the pressing state of the bare cell 203 .

[0066] Specifically, the present embodiment discloses a device capable of preventing the tabs of soft-pack lithium batteries from breaking during ultrasonic welding, which is integrated on a mechanical turntable platform 1, and a bare battery cell 203 is placed on the above-mentioned bare battery cell platform, and the tab 204 of the bare battery cell 203 extends to the edge of the mechanical turntable platform 1, and two ultrasonic welding horns 101 arranged at intervals in the vertical direction are provided at the position cooperating with the tab 204, and the tab 204 can be extended between the two ultrasonic welding horns 101 to complete the welding operation of the tab 204 using the ultrasonic welding horn 101.

[0067] Secondly, this embodiment designs three main functional components: a battery cell horizontal moving component 3, a battery cell pressing component 4, and a battery cell pressing cylinder component 5;

[0068] Among them, the battery cell horizontal moving component 3 can drive the bare battery cell platform and the bare battery cell 203 to move horizontally toward the side of the ultrasonic welding horn 101. Since the multi-layer tab 204 is first positioned and fixed by spot welding, and then ultrasonic welding is performed, and there is stress at the welding point of the multi-layer tab 204 after spot welding, in order to reduce the stress, the battery cell horizontal moving component 3 is needed to push the bare battery cell platform and the bare battery cell 203 toward the side of the ultrasonic welding horn 101 to ensure that the battery cell tab 204 is in a relaxed state, and then the battery cell pressing component 4 is used to press the bare battery cell 203 to perform the tab 204 welding operation. Finally, the pressing state of the bare battery cell 203 is released by the battery cell pressing cylinder component 5 to complete the entire welding process.

[0069] Preferably, the bare cell platform of this embodiment has a platform horizontal portion 201 for placing the bare cell 203, and a platform vertical portion 202 located at one end of the platform horizontal portion 201 close to the cell horizontal moving assembly 3;

[0070] The battery cell horizontal moving assembly 3 pushes the platform vertical portion 202 to move in the horizontal direction to adjust the relative position of the bare battery cell 203 and the ultrasonic welding horn 101 .

[0071] This embodiment further defines the structure of the bare cell platform, which is formed into an L-shaped platform structure capable of accommodating the bare cell 203 through the above-mentioned platform horizontal part 201 and the platform vertical part 202, and the bare cell 203 is stored on the platform horizontal part 201, while the platform vertical part 202 cooperates with the cell horizontal moving component 3 to realize the overall horizontal movement.

[0072] Preferably, the battery cell horizontal moving assembly 3 of this embodiment includes:

[0073] A horizontal cylinder support 301 is arranged close to the bare cell platform, and a cell moving cylinder 302 is installed on the horizontal cylinder support 301, and a cylinder rod of the cell moving cylinder 302 is connected to the platform vertical portion 202; and

[0074] A fixing device 303 is located at one end of the horizontal cylinder support 301 away from the bare cell platform.

[0075] In this embodiment, the horizontal movement of the bare cell platform and the bare cell 203 is mainly achieved through the cell moving cylinder 302. The cylinder rod of the cell moving cylinder 302 can be extended to push the bare cell platform to move, thereby adjusting the relative position of the bare cell 203 and the ultrasonic welding welding head 101.

[0076] Preferably, the battery cell pressing assembly 4 of this embodiment includes:

[0077] A cell pressing support rod 401, one end of which is connected to the fixing device 303, and the other end of which is fixed with a cell pressing plate 402 by bolts; and

[0078] A limit spring mechanism connected between the battery cell pressing support rod 401 and the fixing device 303;

[0079] The cell pressing support rod 401 drives the cell pressing plate 402 to press the bare cell 203 on the bare cell platform through the spring force of the limit spring mechanism.

[0080] Wherein, the above-mentioned limit spring mechanism includes:

[0081] A limit spring lower bracket 403 disposed on the fixing device 303; and

[0082] A limit spring upper bracket 404 provided on the battery core pressing support rod 401;

[0083] A limit spring 405 is provided between the limit spring lower bracket 403 and the limit spring upper bracket 404;

[0084] The limit spring 405 tightens the limit spring upper bracket 404 to drive the battery cell pressing support rod 401 to flip toward the side of the bare battery cell 203 to press the bare battery cell 203 .

[0085] First, the present embodiment further defines the structural composition of the battery cell pressing assembly 4, which is provided with a battery cell pressing support rod 401 that can be flipped relative to the fixing device 303, a battery cell pressing plate 402 is installed at one end of the battery cell pressing support rod 401 by bolts, and a limit spring mechanism is provided between the battery cell pressing support rod 401 and the fixing device 303, and the limit spring mechanism of the present embodiment includes a limit spring lower bracket 403 and a limit spring upper bracket 404 respectively provided on the fixing device 303 and the battery cell pressing support rod 401; and a limit spring 405 is connected between the limit spring lower bracket 403 and the limit spring upper bracket 404. The limit spring 405 is in a stretched state, so the limit spring 405 will stretch the end of the battery cell pressing support rod 401 under the action of the spring force, driving the battery cell pressing plate 402 at the other end of the battery cell pressing support rod 401 to move toward the surface of the bare battery cell 203 to press the bare battery cell 203.

[0086] More preferably, the cell pressing support rod 401 of this embodiment cooperates with the fixing device 303 and is provided with a cell thickness adjustment limit block 406 and a cell pressing support rod limit block 407 at one end;

[0087] A through slot 305 is provided along the thickness direction of the fixing device 303 at the position where the fixing device 303 cooperates with the battery cell thickness adjustment limit block 406, and the battery cell thickness adjustment limit block 406 can extend into the through slot 305;

[0088] A notch groove 306 is provided at the matching position between the fixing device 303 and the battery cell clamping support rod limit block 407. When the battery cell clamping support rod 401 flips toward the fixing device 303, the lower end of the battery cell clamping support rod limit block 407 abuts against the inner wall of the notch groove 306 to limit the flipping degree of the battery cell clamping support rod 401.

[0089] In addition, a cell thickness adjustment bolt 304 is provided in the horizontal direction at the position where the fixing device 303 of this embodiment cooperates with the through slot 305, and the cell thickness adjustment bolt 304 can be screwed into the fixing device 303 and contact the lower end surface of the cell thickness adjustment limit block 406;

[0090] The lower end surface of the cell thickness adjustment limit block 406 is configured as an inclined surface structure, and the cell thickness adjustment bolt 304 abuts against the inclined surface structure to fine-tune the height of the cell pressing plate 402 of the cell pressing support rod 401 by adjusting the extension length.

[0091] The cell thickness adjustment limit block 406 protruding from the lower part of one end of the cell clamping support rod 401 of the present embodiment is embedded in the opened through groove 305, and cooperates with the cell thickness adjustment bolt 304 on the side of the fixing device 303. Since the lower end of the cell thickness adjustment limit block 406 is designed with a slope structure, as the extension length of the cell thickness adjustment bolt 304 changes, it can abut against different positions of the slope structure, thereby realizing fine adjustment of the height of the cell clamping support rod 401 to adapt to bare cells 203 of different thicknesses.

[0092] Preferably, a positioning groove is provided on the upper surface of the battery cell pressing support rod 401 of this embodiment away from the battery cell pressing plate 402;

[0093] The battery cell pressing cylinder assembly 5 comprises:

[0094] Vertical cylinder support 501; and

[0095] A downward pressing cylinder 502 integrated in the vertical cylinder bracket 501, the cylinder rod of the downward pressing cylinder 502 extends toward the battery cell pressing support rod 401, and the cylinder rod of the downward pressing cylinder 502 and the battery cell pressing support rod 401 are matched in the positioning groove;

[0096] The cylinder rod of the downward pressing cylinder 502 extends and pushes the battery cell pressing support rod 401 to flip over to drive the battery cell pressing plate 402 away from the bare battery cell 203 .

[0097] In order to drive the battery cell pressing support rod 401 to release the pressing state of the bare battery cell 203, the present embodiment designs a battery cell pressing cylinder assembly 5. The cylinder rod of the pressing cylinder 502 of the battery cell pressing cylinder assembly 5 can push one end of the battery cell pressing support rod 401 by extending, thereby driving the battery cell pressing support rod 401 to flip to allow the battery cell pressing plate 402 to move away from the bare battery cell 203.

[0098] Preferably, at least one set of devices is provided on the mechanical turntable platform 1 of this embodiment.

[0099] In the above technical solution, the utility model provides a device for preventing the tab of a soft-pack lithium battery from breaking, which has the following beneficial effects:

[0100] During ultrasonic welding of the battery cell tab 204, the device of the utility model utilizes the ultrasonic welding welding head 101 to clamp the tab 204 of the bare battery cell 203, and the battery cell horizontal moving component 3 drives the bare battery cell platform to move horizontally to relax the battery cell tab 204, and then utilizes the battery cell clamping component 4 to press the bare battery cell 203 and then perform the ultrasonic welding machine to complete the tab welding operation. Since the horizontal movement of the bare battery cell 203 is achieved in the early stage, the stress at the spot welding point is eliminated, and the breakage problem of the multi-layer tab 204 is effectively prevented, thereby saving costs for battery cell manufacturers and improving the battery cell yield rate.

[0101] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for preventing the tab of a soft-pack lithium battery from breaking, characterized in that: The device includes: Mechanical turntable platform (1); A bare cell platform integrated on the mechanical turntable platform (1), a bare cell (203) being placed on the bare cell platform, and a tab (204) of the bare cell (203) extending to the edge of the bare cell platform; and A battery cell horizontal movement assembly (3), a battery cell pressing assembly (4) and a battery cell pressing cylinder assembly (5); An ultrasonic welding horn (101) is provided at the matching position between the mechanical turntable platform (1) and the pole lug (204) of the bare battery cell (203), and two ultrasonic welding horns (101) are provided in the vertical direction, and the space between the two ultrasonic welding horns (101) is the welding operation space of the pole lug (204), and the pole lug (204) can extend into the welding operation space; The battery cell pressing assembly (4) drives the battery cell pressing plate (402) at the end thereof to move via the battery cell pressing support rod (401) to press the bare battery cell (203); During welding, the battery cell horizontal moving component (3) pushes the bare battery cell (203) to move toward one side of the ultrasonic welding welding head (101); The battery cell pressing cylinder assembly (5) cooperates with the end of the battery cell pressing support rod (401) away from the battery cell pressing plate (402) to release the pressing state of the bare battery cell (203).

2. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 1, characterized in that: The bare cell platform comprises a platform horizontal portion (201) for placing the bare cell (203), and a platform vertical portion (202) located at one end of the platform horizontal portion (201) close to the cell horizontal moving assembly (3); The battery cell horizontal movement component (3) pushes the platform vertical portion (202) to move in a horizontal direction to adjust the relative position of the bare battery cell (203) and the ultrasonic welding horn (101).

3. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 2, characterized in that: The battery cell horizontal moving component (3) comprises: A horizontal cylinder support (301) is arranged close to the bare cell platform, and a cell moving cylinder (302) is installed on the horizontal cylinder support (301), and a cylinder rod of the cell moving cylinder (302) is connected to the platform vertical portion (202); and A fixing device is located at one end of the horizontal cylinder support (301) away from the bare cell platform.

4. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 3, characterized in that: The battery core pressing assembly (4) comprises: The battery cell pressing support rod (401), one end of the battery cell pressing support rod (401) is connected to the fixing device (303), and the other end of the battery cell pressing support rod (401) is fixed with the battery cell pressing plate (402) by bolts; and A limit spring mechanism connected between the battery core pressing support rod (401) and the fixing device (303); The battery cell pressing support rod (401) drives the battery cell pressing plate (402) to press the bare battery cell (203) on the bare battery cell platform through the spring force of the limit spring mechanism.

5. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 4, characterized in that: The limit spring mechanism comprises: A limit spring lower bracket (403) disposed on the fixing device (303); and A limit spring upper bracket (404) arranged on the battery core pressing support rod (401); A limit spring (405) is arranged between the limit spring lower bracket (403) and the limit spring upper bracket (404); The limit spring (405) tightens the limit spring upper bracket (404) to drive the battery cell pressing support rod (401) to flip toward the side of the bare battery cell (203) to press the bare battery cell (203).

6. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 5, characterized in that: The battery cell pressing support rod (401) cooperates with the fixing device (303) and is provided with a battery cell thickness adjustment limit block (406) and a battery cell pressing support rod limit block (407) at one end; A through slot (305) is provided along the thickness direction of the fixing device (303) at a position where the fixing device (303) cooperates with the battery cell thickness adjustment limit block (406), and the battery cell thickness adjustment limit block (406) can extend into the through slot (305); A notch groove (306) is provided at the matching position between the fixing device (303) and the battery cell pressing support rod limit block (407); when the battery cell pressing support rod (401) flips toward one side of the fixing device (303), the lower end of the battery cell pressing support rod limit block (407) abuts against the inner wall of the notch groove (306) to limit the flipping degree of the battery cell pressing support rod (401).

7. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 6, characterized in that: A cell thickness adjustment bolt (304) is provided in the horizontal direction at a position where the fixing device (303) cooperates with the through slot (305), and the cell thickness adjustment bolt (304) can be screwed into the fixing device (303) and contact the lower end surface of the cell thickness adjustment limit block (406); The lower end surface of the cell thickness adjustment limit block (406) is configured as an inclined surface structure, and the cell thickness adjustment bolt (304) abuts against the inclined surface structure to fine-tune the height of the cell pressing plate (402) of the cell pressing support rod (401) by adjusting the insertion length.

8. The device for preventing the tab of a soft-pack lithium battery from breaking according to claim 4, characterized in that: A positioning groove is provided on the upper surface of one end of the battery cell pressing support rod (401) away from the battery cell pressing plate (402); The battery cell pressing cylinder assembly (5) comprises: A vertical cylinder support (501); and A downward pressing cylinder (502) integrated in the vertical cylinder support (501), the cylinder rod of the downward pressing cylinder (502) extending toward the battery cell pressing support rod (401), and the cylinder rod of the downward pressing cylinder (502) and the battery cell pressing support rod (401) are matched in the positioning groove; The cylinder rod of the downward pressing cylinder (502) extends out and pushes the battery cell pressing support rod (401) to flip over so as to drive the battery cell pressing plate (402) away from the bare battery cell (203).

9. A device for preventing the tab of a soft-pack lithium battery from breaking according to any one of claims 1 to 8, characterized in that: At least one set of the devices is arranged on the mechanical turntable platform (1).

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