Gradient pressure circulating injection device for electrolyte of all-tab battery and use method of gradient pressure circulating injection device
Through the gradient pressure cycling injection device of the all-pole ear battery electrolyte, the problems of uneven distribution of the electrolyte and excessive pressure are solved, uniform penetration of the electrolyte and efficient injection of the electrolyte are achieved, battery damage is avoided, and battery quality and liquid injection efficiency are improved.
Patent Information
- Application Number
- CN202510513459.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-25
AI Technical Summary
During the electrolyte injection process, the electrolyte distribution is uneven, the dry area is prone to occur, and the battery is bulging or deformation caused by excessive injection pressure.
The gradient pressure cycle injection device of the electrolyte is adopted for the all-pole ear battery. Through the cooperation of the liquid injection mechanism and the moving mechanism, the gradient pressure cycle injection is realized, and the internal pressure of the battery is gradually increased to ensure uniform penetration of the electrolyte and avoid excessive pressure, including the coordinated work of the cylinder, motor, slide rod, liquid injection tube and suction cup.
The uniform wetting of the electrolyte in the pores of the electrode and separator is achieved, and the battery is avoided torsion and deformation, which improves the liquid injection efficiency and quality, and reduces the waste of electrolyte.
Smart Images
Figure CN120376902A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of battery liquid injection, and specifically provides a gradient pressure cyclic injection device and a usage method for electrolyte of a full-tab battery. Background Art
[0002] With the continuous development of new energy technologies, lithium-ion batteries have been widely used in fields such as electric vehicles and energy storage systems. As a new type of high-performance battery structure, the full-tab battery has gradually become a research and application hotspot due to its advantages such as lower internal resistance, higher energy density, and better heat dissipation performance. However, during the production process of the full-tab battery, many technical challenges are faced in the electrolyte injection process.
[0003] The electrode and separator structures of the full-tab battery are relatively complex, and the electrolyte needs to fully infiltrate the pores of the electrode and separator to ensure the performance and safety of the battery. However, there are many deficiencies in traditional electrolyte injection methods. For example, during the liquid injection process, the distribution of the electrolyte inside the battery is prone to be uneven. Especially in the middle position of the electrode sheet, dry areas are likely to appear, thus affecting the performance and consistency of the battery. In addition, if the electrolyte is directly injected under high pressure, the internal pressure of the battery is likely to be too high, resulting in battery swelling or deformation, and even damaging the battery structure, affecting the service life and safety of the battery.
[0004] In order to improve the liquid injection efficiency and quality, reduce electrolyte waste, and at the same time adapt to the complex internal structure of the full-tab battery, a more advanced and efficient electrolyte injection technology is needed. The gradient pressure cyclic injection technology has emerged as the times require. This technology alternately acts at different pressure stages, enabling the electrolyte to penetrate more evenly into the pores of the electrode and separator, while avoiding damaging the battery due to excessive pressure. After the initial injection of the electrolyte, low-pressure cycling is used to further diffuse the electrolyte, and then high-pressure cycling is used to ensure that the electrolyte is fully infiltrated. In addition, by precisely controlling the pressure and the number of cycles, the situation of excessive or insufficient electrolyte injection can also be reduced, thereby improving the liquid injection efficiency and reducing electrolyte waste. Summary of the Invention
[0005] Aiming at the deficiencies of the prior art, the present invention provides a gradient pressure cyclic injection device and a usage method for electrolyte of a full-tab battery, which solve the problems of uneven electrolyte distribution, easy appearance of dry areas, and battery swelling caused by too high injection pressure during the electrolyte injection process of the full-tab battery.
[0006] To achieve the above object, the present invention is realized through the following technical solutions: A full-tab battery electrolyte gradient pressure cyclic injection device, including a device housing, on the upper surface of the device housing, a plurality of high-frequency micro-vibrators are fixedly connected, on the top of the high-frequency micro-vibrators, a liquid injection seat is fixedly connected, on the surface of the liquid injection seat, a plurality of liquid injection seat holes are provided, and at the inner top of the device housing, a liquid injection mechanism is provided, and the liquid injection mechanism is used for liquid injection.
[0007] Preferably, the liquid injection mechanism includes a first cylinder, the first cylinder is fixedly connected to the inner top of the device housing, at the bottom of the first cylinder, a first mounting frame is fixedly connected, on one side of the first mounting frame, a first motor is installed, at the output end of the first motor, a lead screw is fixedly connected, on the outer circumference of the lead screw, an internally threaded sleeve is threadedly connected, on the side of the first mounting frame away from the first motor, a first sliding rod is fixedly connected, and on the outer circumference of the first sliding rod, a sliding sleeve is slidably connected, on the outside of the sliding sleeve, a second fixed rod is fixedly connected, and at the end of the second fixed rod away from the sliding sleeve, it is fixedly connected to the outside of the internally threaded sleeve, and at the bottom of the second fixed rod, a liquid injection component is provided.
[0008] Preferably, the liquid injection component includes a first fixed rod, the first fixed rod is fixedly connected to the bottom of the second fixed rod, at the bottom of the first fixed rod, a second mounting frame is fixedly connected, and at the bottom of the second mounting frame, a plurality of liquid injection tubes are fixedly connected.
[0009] Preferably, on the top of the device housing, a pre-liquid injection storage seat and a pre-welding storage seat are fixedly connected, on the top of the pre-liquid injection storage seat, a plurality of pre-liquid injection storage holes are provided, and on the top of the pre-welding storage seat, a plurality of pre-welding storage holes are provided.
[0010] Preferably, a moving mechanism is provided on the upper side inside the device housing, and the moving mechanism includes a concave plate, a second cylinder, a slider, a fixing plate, a second sliding rod, a mounting plate, a suction cup, a second motor, and a friction roller.
[0011] Preferably, there are two concave plates, the two concave plates are respectively installed on the inner wall of the device housing, and in the middle of the two concave plates, sliders are slidably connected.
[0012] Preferably, on the top of the slider, a second motor is fixedly connected, at the output end of the second motor, a friction roller is fixedly connected, in the middle of the slider, a second sliding rod is slidably connected, and the second sliding rod is in contact with the friction roller.
[0013] Preferably, on one side of the slider, a fixing plate is fixedly connected, in the middle of the fixing plate, a second cylinder is fixedly connected, at the output end of the second cylinder, a mounting plate is fixedly connected, and at the bottom of the mounting plate, a plurality of suction cups are fixedly connected.
[0014] The present invention also provides a method for using a full-tab battery electrolyte gradient pressure cyclic injection device, including the following steps:
[0015] S1: The front-stage mechanism places the battery to be injected with liquid into the pre-injection liquid storage hole inside the pre-injection liquid storage seat. The second motor drives the friction roller to rotate, which has a frictional effect on the second sliding rod, driving the slider to slide inside the concave plate, thereby driving the suction cup to move horizontally, making the suction cup fit against the side of the battery and suck it. The second cylinder drives the mounting plate to rise, and then moves again to reach the upper end of the injection seat. The second cylinder is started to drive the mounting plate to descend, so that the battery enters the injection seat hole;
[0016] S2: The first motor drives the lead screw to rotate, thereby driving the internally threaded sleeve to move. The internally threaded sleeve drives the sliding sleeve to move horizontally on the surface of the first sliding rod through the second fixing rod, thereby driving the second mounting frame and the liquid injection pipe at its lower end to move to the upper end of the battery. The first cylinder is started to drive the liquid injection pipe to descend to an appropriate height;
[0017] S3: Gradient pressure cycle injection can gradually increase the pressure, enabling the internal pressure of the battery to gradually adapt, avoiding damage to the battery due to excessive pressure. After the electrolyte is initially injected, the low-pressure cycle is used to further diffuse the electrolyte, and then the high-pressure cycle is used to ensure that the electrolyte is fully infiltrated;
[0018] S4: After the liquid injection is completed, the second motor in the moving mechanism drives the friction roller to rotate, which has a frictional effect on the second sliding rod, driving the slider to slide inside the concave plate, thereby driving the suction cup to move horizontally, making the suction cup suck the battery in the injection seat. The second cylinder drives the mounting plate to rise, and then moves again to reach the upper end of the pre-welding storage seat. The second cylinder is started to drive the mounting plate to descend, so that the battery enters the pre-welding storage hole for the next welding step.
[0019] The present invention provides a gradient pressure cycle injection device and a usage method for the electrolyte of a full-tab battery.
[0020] It has the following beneficial effects:
[0021] 1. The present invention improves the electrolyte infiltration effect; accelerates the penetration of the electrolyte: The electrode and diaphragm structures of the full-tab battery are relatively complex, and the electrolyte needs to fully infiltrate the pores of the electrode and diaphragm. Gradient pressure cycle injection can alternately act at different pressure stages, making the electrolyte more evenly penetrate into the pores of the electrode and diaphragm. Reduce the dry area: During the liquid injection process, the distribution of the electrolyte inside the battery is prone to be uneven, especially in the middle position of the electrode sheet. Through gradient pressure cycle injection, the distribution of the electrolyte can be adjusted multiple times at different pressures, reducing the dry area.
[0022] 2. The present invention avoids excessive internal pressure of the battery; prevents the battery from bulging and deforming: If the electrolyte is directly injected under high pressure, the internal pressure of the battery may be too high, resulting in the battery bulging or deforming, and even possibly damaging the battery structure. Gradient pressure cycle injection can gradually increase the pressure, enabling the internal pressure of the battery to gradually adapt, avoiding damage to the battery due to excessive pressure.
[0023] 3. The present invention improves the liquid injection efficiency and quality; optimizes the liquid injection process: Gradient pressure cyclic injection can flexibly adjust the pressure according to the distribution of the electrolyte inside the battery, thereby optimizing the liquid injection process. For example, after the electrolyte is initially injected, low-pressure cycling is used to further diffuse the electrolyte, and then high-pressure cycling is used to ensure that the electrolyte is fully infiltrated. Reduces electrolyte waste: By precisely controlling the pressure and the number of cycles, excessive or insufficient injection of the electrolyte can be avoided, thereby reducing electrolyte waste and improving the liquid injection efficiency.
[0024] 4. The present invention adapts to the internal structure of the battery; the special structure of the all-pole ear battery: The electrode design of the all-pole ear battery makes the infiltration path of the electrolyte more complex. Gradient pressure cyclic injection can gradually adjust the injection path and distribution of the electrolyte according to the characteristics of the internal structure of the battery to ensure that the electrolyte can evenly infiltrate the electrodes and the separator. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is a three-dimensional structure schematic diagram of the present invention;
[0026] Figure 2 is an internal three-dimensional structure schematic diagram of the present invention;
[0027] Figure 3 is a three-dimensional structure schematic diagram of the liquid injection seat of the present invention;
[0028] Figure 4 is a three-dimensional structure schematic diagram of the liquid injection mechanism of the present invention;
[0029] Figure 5 is a three-dimensional structure schematic diagram of the moving mechanism of the present invention;
[0030] Figure 6 is a schematic diagram of the internal structure of the slider of the present invention;
[0031] Figure 7 is a top view structure schematic diagram of the liquid injection mechanism of the present invention;
[0032] Figure 8 is a top view structure schematic diagram of the moving mechanism of the present invention;
[0033] Figure 9 is a top view structure schematic diagram of the whole of the present invention.
[0034] Among them, 1. Device housing; 2. Moving mechanism; 3. Liquid injection mechanism; 4. Pre-liquid injection storage seat; 5. Pre-liquid injection storage hole; 6. Liquid injection seat hole; 7. Liquid injection seat; 8. High-frequency micro-vibrator; 9. Pre-welding storage seat; 10. Pre-welding storage hole; 11. Cylinder 1; 12. Motor 1; 13. Mounting bracket 1; 14. Slide bar 1; 15. Slide sleeve; 16. Fixed bar 1; 17. Mounting bracket 2; 18. Liquid injection pipe; 19. Internal thread sleeve; 20. Fixed bar 2; 21. Lead screw; 22. Concave plate; 23. Cylinder 2; 24. Slide block; 25. Fixed plate; 26. Slide bar 2; 27. Mounting plate; 28. Suction cup; 29. Motor 2; 30. Friction roller. Detailed implementation manners
[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0036] Please refer to the attached Figure 1 - attached Figure 3 , an electrolyte gradient pressure cycle injection device for all-pole ear batteries provided by an embodiment of the present invention includes a device housing 1. A plurality of high-frequency micro-vibrators 8 are fixedly connected to the upper surface of the device housing 1. A liquid injection seat 7 is fixedly connected to the top of the high-frequency micro-vibrator 8. A plurality of liquid injection seat holes 6 are formed on the surface of the liquid injection seat 7. A liquid injection mechanism 3 is provided at the inner top of the device housing 1, and the liquid injection mechanism 3 is used for liquid injection.
[0037] A plurality of high-frequency micro-vibrators 8 can conveniently generate high-frequency and small-amplitude vibrations, thereby conveniently driving the liquid injection seat 7 to vibrate at a high frequency. The liquid injection seat 7 and the liquid injection seat holes 6 can facilitate liquid injection.
[0038] Please refer to the attached Figure 1 , attached Figure 2 and attached Figure 4 , the liquid injection mechanism 3 includes a cylinder 11. The cylinder 11 is fixedly connected to the inner top of the device housing 1. A mounting bracket 13 is fixedly connected to the bottom of the cylinder 11. A motor 12 is installed on one side of the mounting bracket 13. The output end of the motor 12 is fixedly connected to a lead screw 21. An internal thread sleeve 19 is threadedly connected to the outer circumference of the lead screw 21. A slide bar 14 is fixedly connected to the side of the mounting bracket 13 away from the motor 12. A slide sleeve 15 is slidably connected to the outer circumference of the slide bar 14. A fixed bar 20 is fixedly connected to the outside of the slide sleeve 15. One end of the fixed bar 20 away from the slide sleeve 15 is fixedly connected to the outside of the internal thread sleeve 19. A feeding assembly is provided at the bottom of the fixed bar 20.
[0039] The device housing 1 can facilitate the more firm support and fixation of the first cylinder 11. When the first cylinder 11 works, it will drive the first mounting bracket 13 to move downward. When the first mounting bracket 13 moves, it can facilitate the simultaneous movement of the first motor 12. At the same time, the first mounting bracket 13 can facilitate the support and fixation of the first motor 12, making the first motor 12 more stable. When the first motor 12 works, it can facilitate the rotation of the lead screw 21. When the lead screw 21 rotates, it can facilitate the rotation of the internal thread sleeve 19; under the action of the second fixed rod 20 and the first slide rod 14, it can facilitate the limitation of the internal thread sleeve 19, and further prevent the internal thread sleeve 19 from shifting when moving.
[0040] Please refer to the appendix Figure 4 , appendix Figure 7 and appendix Figure 8 , the injection component includes the first fixed rod 16, the first fixed rod 16 is fixedly connected to the bottom of the second fixed rod 20, the bottom of the first fixed rod 16 is fixedly connected with the second mounting bracket 17, and the bottom of the second mounting bracket 17 is fixedly connected with a plurality of liquid injection pipes 18.
[0041] The first fixed rod 16 and the second fixed rod 20 can facilitate the support of the second mounting bracket 17, making the second mounting bracket 17 more stable. The second mounting bracket 17 can facilitate the support and fixation of a plurality of liquid injection pipes 18, and a plurality of liquid injection pipes 18 can facilitate the liquid injection process.
[0042] Please refer to the appendix Figure 3 and appendix Figure 9 , the top of the device housing 1 is fixedly connected with a pre-injection liquid storage seat 4 and a pre-welding storage seat 9. The top of the pre-injection liquid storage seat 4 is provided with a plurality of pre-injection liquid storage holes 5, and the top of the pre-welding storage seat 9 is provided with a plurality of pre-welding storage holes 10.
[0043] The pre-welding storage seat 9 and the pre-welding storage holes 10 can respectively facilitate the placement of the welding points, thus facilitating the operation of the work.
[0044] Please refer to the appendix Figure 2 , appendix Figure 5 and appendix Figure 6 , a moving mechanism 2 is arranged on the upper side inside the device housing 1. The moving mechanism 2 includes a concave plate 22, a second cylinder 23, a slider 24, a fixing plate 25, a second slide rod 26, a mounting plate 27, a suction cup 28, a second motor 29 and a friction roller 30; there are two concave plates 22, and the two concave plates 22 are respectively installed on the inner wall of the device housing 1, and the middle parts of the two concave plates 22 are both slidably connected with the slider 24.
[0045] The device housing 1 can facilitate the support and fixation of the two concave plates 22, making the two concave plates 22 more stable. At the same time, under the action of the two concave plates 22, it can facilitate the support and limitation of the slider 24.
[0046] Please refer to the appendix Figure 5 and the appendix Figure 6 , a second motor 29 is fixedly connected to the top of the slider 24, an output end of the second motor 29 is fixedly connected to a friction roller 30, a second sliding rod 26 is slidably connected to the middle of the slider 24, and the second sliding rod 26 is in contact with the friction roller 30; a fixing plate 25 is fixedly connected to one side of the slider 24, a second cylinder 23 is fixedly connected to the middle of the fixing plate 25, an output end of the second cylinder 23 is fixedly connected to a mounting plate 27, and a plurality of suction cups 28 are fixedly connected to the bottom of the mounting plate 27.
[0047] The slider 24 can conveniently support and fix the second motor 29, so that the second motor 29 can work better. When the second motor 29 works, it can conveniently drive the friction roller 30 to rotate. When the friction roller 30 rotates, it can conveniently drive the slider 24 and the fixing plate 25 to move simultaneously in cooperation with the second sliding rod 26. When the fixing plate 25 moves, it can conveniently drive the second cylinder 23 to move simultaneously, and the second cylinder 23 can be conveniently supported and fixed under the action of the fixing plate 25. When the second cylinder 23 works, it will drive the mounting plate 27 to move, and when the mounting plate 27 moves, it will drive a plurality of suction cups 28 to move.
[0048] The usage method of a full-tab battery electrolyte gradient pressure cyclic injection device described below can be mutually referred to with a full-tab battery electrolyte gradient pressure cyclic injection device described above.
[0049] The present invention also provides a construction method for an assembled station structure with a cast-in-place floor slab, including the following steps:
[0050] S1: The front-stage mechanism places the battery to be injected with liquid into the pre-injection liquid storage hole 5 in the pre-injection liquid storage seat 4. The second motor 29 drives the friction roller 30 to rotate to act on the second sliding rod 26 by friction, driving the slider 24 to slide inside the concave plate 22, thereby driving the suction cups 28 to move horizontally, making the suction cups 28 fit against the side of the battery and suck it. The second cylinder 23 drives the mounting plate 27 to rise, and then moves again to reach the upper end of the injection seat 7. The second cylinder 23 is started to drive the mounting plate 27 to descend, so that the battery enters the injection seat hole 6;
[0051] S2: The first motor 12 drives the lead screw 21 to rotate, thereby driving the internally threaded sleeve 19 to move. The internally threaded sleeve 19 drives the sliding sleeve 15 to move horizontally on the surface of the first sliding rod 14 through the second fixing rod 20, thereby driving the mounting frame two 17 and the injection pipe 18 at its lower end to move to the upper end of the battery. The first cylinder 11 is started to drive the injection pipe 18 to descend to an appropriate height;
[0052] S3: Through gradient pressure cyclic injection, the pressure inside the battery can be gradually adapted by increasing the pressure step by step, avoiding damage to the battery due to excessive pressure. After the initial injection of the electrolyte, the electrolyte is further diffused through low-pressure cycling, and then high-pressure cycling is used to ensure sufficient infiltration of the electrolyte;
[0053] S4: After the liquid injection is completed, the motor two 29 in the moving mechanism 2 drives the friction roller 30 to rotate, which has a frictional effect on the second slide bar 26, driving the slider 24 to slide inside the concave plate 22, thereby driving the suction cup 28 to move horizontally, so that the suction cup 28 sucks the battery in the liquid injection seat 7. The cylinder two 23 drives the mounting plate 27 to rise, and then moves again to reach the upper end of the pre-welding storage seat 9. The cylinder two 23 is started to drive the mounting plate 27 to descend, so that the battery enters the pre-welding storage hole 10 for the next welding step.
[0054] The usage method of this embodiment can be used to implement the above device embodiment, and its principle and technical effects are similar, so they will not be elaborated here.
[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A gradient pressure cyclic injection device for an all-tab battery electrolyte, comprising a device housing (1), characterized in that, On the upper surface of the device housing (1), a plurality of high-frequency micro-vibrators (8) are fixedly connected. On the top of the high-frequency micro-vibrators (8), a liquid injection seat (7) is fixedly connected. A plurality of liquid injection seat holes (6) are formed on the surface of the liquid injection seat (7). An injection mechanism (3) is provided at the inner top of the device housing (1), and the injection mechanism (3) is used for liquid injection.
2. The gradient pressure cyclic injection device for the electrolyte of an all-tab battery according to claim 1, wherein The injection mechanism (3) includes a first cylinder (11), the first cylinder (11) is fixedly connected to the inner top of the device housing (1), a mounting frame one (13) is fixedly connected to the bottom of the first cylinder (11), a first motor (12) is installed on one side of the mounting frame one (13), a lead screw (21) is fixedly connected to the output end of the first motor (12), an internally threaded sleeve (19) is threadedly connected to the outer circumference of the lead screw (21), a first slide bar (14) is fixedly connected to the side of the mounting frame one (13) away from the first motor (12), and a slide sleeve (15) is slidably connected to the outer circumference of the first slide bar (14). A second fixed rod (20) is fixedly connected to the outside of the slide sleeve (15), and a liquid injection component is provided at the bottom of the second fixed rod (20).
3. The gradient pressure cyclic injection device for the electrolyte of an all-tab battery according to claim 2, wherein, The liquid injection component includes a first fixed rod (16), the first fixed rod (16) is fixedly connected to the bottom of the second fixed rod (20), a mounting frame two (17) is fixedly connected to the bottom of the first fixed rod (16), and a plurality of liquid injection tubes (18) are fixedly connected to the bottom of the mounting frame two (17).
4. A gradient pressure cyclic injection device for an all-tab battery electrolyte according to claim 1, characterized in that, A pre-liquid injection storage seat (4) and a pre-welding storage seat (9) are fixedly connected to the top of the device housing (1). A plurality of pre-liquid injection storage holes (5) are formed on the top of the pre-liquid injection storage seat (4), and a plurality of pre-welding storage holes (10) are formed on the top of the pre-welding storage seat (9).
5. A gradient pressure cyclic injection device for an all-pole-ear battery electrolyte, according to claim 1, characterized in that A moving mechanism (2) is provided on the upper side inside the device housing (1), and the moving mechanism (2) includes a concave plate (22), a second cylinder (23), a slider (24), a fixing plate (25), a second slide bar (26), a mounting plate (27), a suction cup (28), a second motor (29) and a friction roller (30).
6. The gradient pressure cyclic injection device for the electrolyte of an all-tab battery according to claim 5, wherein There are two concave plates (22), and the two concave plates (22) are respectively installed on the inner wall of the device housing (1). A slider (24) is slidably connected to the middle of the two concave plates (22).
7. The gradient pressure cyclic injection device for the electrolyte of an all-tab battery according to claim 6, wherein A second motor (29) is fixedly connected to the top of the slider (24), a friction roller (30) is fixedly connected to the output end of the second motor (29), a second slide bar (26) is slidably connected to the middle of the slider (24), and the second slide bar (26) is in contact with the friction roller (30).
8. A gradient pressure cyclic injection device for an all-pole-ear battery electrolyte according to claim 7, characterized in that, A fixing plate (25) is fixedly connected to one side of the slider (24), a second cylinder (23) is fixedly connected to the middle of the fixing plate (25), a mounting plate (27) is fixedly connected to the output end of the second cylinder (23), and a plurality of suction cups (28) are fixedly connected to the bottom of the mounting plate (27).
9. A method for using an electrolyte gradient pressure cyclic injection device for an all-tab battery, which is applied to the electrolyte gradient pressure cyclic injection device for an all-tab battery according to any one of claims 1-8, characterized in that, Including the following steps: S1: The front-stage mechanism places the battery to be filled with liquid into the pre-filling liquid storage hole (5) inside the pre-filling liquid storage seat (4). The second motor (29) drives the friction roller (30) to rotate, which has a frictional effect on the second sliding rod (26), driving the slider (24) to slide inside the concave plate (22), thereby driving the suction cup (28) to move horizontally, making the suction cup (28) fit against the side of the battery and suck it. The second cylinder (23) drives the mounting plate (27) to rise, and then moves again to reach the upper end of the filling seat (7). Then, the second cylinder (23) is started to drive the mounting plate (27) to descend, so that the battery enters the filling seat hole (6). S2: The first motor (12) drives the lead screw (21) to rotate, thereby driving the internally threaded sleeve (19) to move. The internally threaded sleeve (19) drives the sliding sleeve (15) to move horizontally on the surface of the first sliding rod (14) through the second fixing rod (20), thereby driving the mounting bracket two (17) and the filling pipe (18) at its lower end to move to the upper end of the battery. The first cylinder (11) is started to drive the filling pipe (18) to descend to an appropriate height. S3: Through gradient pressure cycle injection, the internal pressure of the battery can be gradually adapted by gradually increasing the pressure, avoiding damage to the battery due to excessive pressure. After the electrolyte is initially injected, the electrolyte is further diffused through a low-pressure cycle, and then a high-pressure cycle is used to ensure that the electrolyte is fully infiltrated. S4: After the liquid injection is completed, the second motor (29) in the moving mechanism (2) drives the friction roller (30) to rotate, which has a frictional effect on the second sliding rod (26), driving the slider (24) to slide inside the concave plate (22), thereby driving the suction cup (28) to move horizontally, making the suction cup (28) suck the battery in the filling seat (7). The second cylinder (23) drives the mounting plate (27) to rise, and then moves again to reach the upper end of the pre-welding storage seat (9). Then, the second cylinder (23) is started to drive the mounting plate (27) to descend, so that the battery enters the pre-welding storage hole (10) for the next welding step.