Liquid injection device for lithium battery production

Abstract

The utility model discloses a liquid injection device for lithium battery production. The liquid injection device comprises a machine table, a rotary fixing mechanism and a liquid injection mechanism, supporting legs are arranged at four corners of the lower end of the machine table, and supporting rods are arranged at the rear end of the upper surface of the machine table; the rotary fixing mechanism is arranged at the upper end of the machine table; the liquid injection mechanism comprises a sliding plate, a piston, a one-way valve, a feeding pipe and a charging barrel, the rear end of the sliding plate is slidably connected into a sliding groove formed in the front side face of the supporting rod, the charging barrel is arranged on the front side of the upper end of the sliding plate, the piston is slidably connected into the charging barrel, the feeding pipe is arranged at a feeding opening in the outer wall of the charging barrel, and the middle of the feeding pipe is connected with the one-way valve in series; according to the liquid injection device for lithium battery production, liquid can be rapidly injected into a lithium battery during liquid injection during lithium battery production, liquid injection is stable, bubbles generated in the lithium battery production process are reduced, meanwhile, the lithium battery is stably and firmly clamped during liquid injection and is not prone to toppling over, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a liquid injection device for lithium battery production. Background Art

[0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as positive / negative electrode material and non-aqueous electrolyte solution. In 1912, lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, MS Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream;

[0003] Some existing lithium battery production injection devices inject materials into a container, and then inject the materials into the unfilled lithium battery through an injection needle;

[0004] There are some problems. The traditional liquid injection device for lithium battery production is unstable in fixing the uninjected lithium batteries during processing, which is easy to tip over. The liquid injection speed is slow. The liquid injection adopts pneumatic liquid injection, which easily causes bubbles to form in the lithium battery. The liquid injection effect is not good, which greatly reduces the work efficiency. For this reason, we propose a liquid injection device for lithium battery production. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a liquid injection device for lithium battery production. When the lithium battery is injected during production, the liquid can be quickly injected into the lithium battery, the injection is stable and the generation of bubbles in the lithium battery production process is reduced. At the same time, the lithium battery during injection is stably and firmly clamped and is not easy to tip over, which greatly improves work efficiency and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid injection device for lithium battery production, comprising a machine platform, a rotating and fixing mechanism and a liquid injection mechanism;

[0007] Machine table: The four corners of the lower end are provided with supporting legs, and the rear end of the upper surface of the machine table is provided with a supporting rod;

[0008] Rotation fixing mechanism: it is arranged at the upper end of the machine;

[0009] Liquid injection mechanism: it includes a sliding plate, a piston, a one-way valve, a feed pipe and a barrel. The rear end of the sliding plate is slidably connected to the slide groove opened on the front side of the support rod. A barrel is provided on the front side of the upper end of the sliding plate. The piston is slidably connected inside the barrel. A feed pipe is provided at the feed port of the outer wall of the barrel. A one-way valve is connected in series in the middle of the feed pipe. When the lithium battery is produced and injected, the liquid can be quickly injected into the lithium battery. The injection is stable and the generation of bubbles in the lithium battery production process is reduced. At the same time, the lithium battery is stably and firmly clamped during the injection, and it is not easy to tip over, which greatly improves the work efficiency.

[0010] Furthermore, a control switch group is provided on the left side of the front end of the machine, and the input end of the control switch group is electrically connected to an external power supply to provide electrical connection for various electrical appliances.

[0011] Furthermore, the rotation and fixing mechanism includes a motor 1, a worm, a rotating column and a worm wheel. The lower end of the rotating column is rotatably connected to the middle part of the bottom wall of the machine platform. The worm wheel is fixedly sleeved in the middle part of the rotating column. The motor 1 is arranged on the bottom wall of the machine platform. The right end of the output shaft of the motor 1 is fixedly connected to the worm. The worm and the worm wheel are meshingly connected. The input end of the motor 1 is electrically connected to the output end of the control switch group to provide rotation drive.

[0012] Furthermore, the rotating and fixing mechanism also includes a turntable, a support block and a sliding clamp block. The turntable is fixedly connected to the upper end of the rotating column, and the outer arc surface of the turntable is rotatably connected to the inner wall of the circular avoidance opening opened on the upper surface of the machine platform. The upper end of the turntable is provided with evenly distributed support blocks, and the sliding grooves on the upper surfaces of the support blocks are respectively slidably connected with horizontally symmetrical sliding clamp blocks for easy clamping.

[0013] Furthermore, the rotating fixing mechanism also includes a sliding rod and a spring. The side surfaces of the outer sliding clamp are fixedly connected to two sliding rods. The inner ends of the two sliding rods are slidably connected to the sliding holes of the inner sliding clamp. A spring is fixedly connected between the two horizontally symmetrical sliding clamps. The springs are respectively sleeved on the outside of the sliding rods. A connecting strip is fixedly connected between the inner ends of the two adjacent sliding rods for easy fixation.

[0014] Furthermore, the rotation and fixing mechanism also includes a rotating shaft, a rotating bar and a second motor. The upper end of the turntable is rotatably connected to a uniformly distributed rotating shaft. The upper ends of the rotating shafts are fixedly connected to rotating bars. The outer arc surfaces of the rotating bars are respectively slidably connected to adjacent connecting bars and inner sliding clamps. The second motors are respectively arranged at the lower end of the turntable. The upper ends of the output shafts of the second motors are respectively fixedly connected to the lower ends of the rotating shafts. The rotating bars are all located on the left side of the connecting bars. The input end of the second motor is electrically connected to the output end of the control switch group to provide a fixed clamping drive.

[0015] Furthermore, the injection mechanism also includes a bracket, a hydraulic cylinder, a support rod, an electric one-way valve and an injection needle. The bracket is arranged at the upper end of the sliding plate, and a hydraulic cylinder is provided at the upper end of the bracket. The lower end of the hydraulic cylinder is fixedly connected to the support rod, and the lower end of the support rod is fixedly connected to the middle part of the upper end of the piston. An electric one-way valve is provided at the discharge port of the barrel, and the lower end of the electric one-way valve is fixedly connected to the injection needle. The input end of the hydraulic cylinder is connected to an external hydraulic pump, and the input end of the electric one-way valve is electrically connected to the output end of the control switch group to facilitate injection.

[0016] Furthermore, the injection mechanism also includes motor three and a screw rod, the screw rod is rotatably connected to a slide groove opened on the front side of the support rod, motor three is arranged at the upper end of the support rod, the lower end of the output shaft of motor three is fixedly connected to the upper end of the screw rod, the threaded hole at the rear end of the sliding plate is threadedly connected to the screw rod, and the input end of motor three is electrically connected to the output end of the control switch group to provide lifting drive.

[0017] Compared with the prior art, the beneficial effects of the utility model are: the liquid injection device for lithium battery production has the following advantages:

[0018] 1. First, place the unfilled lithium battery in the middle of the support block, and then adjust the control switch group to make motor 2 run, the output shaft of motor 2 drives the rotating shaft to rotate, and the rotating shaft drives the rotating bar to rotate. When the rotating bar rotates, the farthest end of the rotating bar away from the rotating shaft contacts the right side surface of the sliding clamp block at the right end and the left side surface of the connecting bar respectively, so that the sliding clamp block at the right end is pushed to the left, and the connecting bar is pulled to the right, and the connecting bar then pulls the sliding rod, and the sliding rod pulls the sliding clamp block at the left end to the right, thereby fixing and clamping the unfilled lithium battery, and then adjusting the control switch group to make motor 1 run, the output shaft of motor 1 drives the worm to rotate, the worm drives the meshing worm wheel to rotate, the rotating column of the worm wheel belt rotates, and then drives the turntable to rotate, so that the unfilled lithium battery is rotated to the lower end of the injection needle, so that the lithium battery during injection is stably and firmly clamped, not easy to tip over, and greatly improves the production efficiency of lithium batteries.

[0019] 2. By regulating the control switch group, motor three operates, the output shaft of motor three drives the screw rod to rotate, the screw rod drives the threaded sliding plate to move up and down, the sliding plate moves the injection needle down to the top of the unfilled lithium battery, and the control switch group is regulated, the external hydraulic pump pressurizes the hydraulic cylinder, the hydraulic cylinder drives the support rod to move up and down, the support rod drives the piston to move up and down, the one-way valve only enters but not exits, the electric one-way valve only exits but not enters, when the piston slides down on the inner wall of the barrel, the electric one-way valve opens, and the liquid at the lower end of the piston is injected into the lithium battery through the injection needle. When the liquid needs to be refilled after a certain period of time, the electric one-way valve opens, the piston moves up, the barrel content volume of the bottom part of the piston increases and the pressure decreases, until the piston is higher than the feed port, the liquid enters the barrel through the feed pipe, and the liquid can be quickly injected into the lithium battery during the production of lithium battery injection, the injection is stable, and the generation of bubbles in the production process of lithium batteries is reduced, thereby improving the quality of lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the front side sectional structure of the utility model;

[0023] Figure 4 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0024] In the figure: 1 machine platform, 2 legs, 3 rotating fixing mechanism, 301 motor 1, 302 worm, 303 rotating column, 304 worm wheel, 305 turntable, 306 support block, 307 sliding clamp block, 308 sliding rod, 309 spring, 310 rotating shaft, 311 rotating bar, 312 motor 2, 4 support rods, 5 injection mechanism, 501 motor 3, 502 sliding plate, 503 screw rod, 504 bracket, 505 hydraulic cylinder, 506 support rod, 507 piston, 508 one-way valve, 509 feeding pipe, 510 barrel, 511 injection needle, 512 electric one-way valve, 6 control switch group. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-4, This embodiment provides a technical solution: a liquid injection device for lithium battery production, including a machine 1, a rotating and fixing mechanism 3 and a liquid injection mechanism 5;

[0027] Machine 1: The four corners of the lower end are provided with legs 2, the rear end of the upper surface of the machine 1 is provided with a support rod 4, the left side of the front end of the machine 1 is provided with a control switch group 6, and the input end of the control switch group 6 is electrically connected to an external power supply;

[0028] Rotating and fixing mechanism 3: It is arranged at the upper end of the machine 1, and the rotating and fixing mechanism 3 includes a motor 301, a worm 302, a rotating column 303 and a worm wheel 304. The lower end of the rotating column 303 is rotatably connected to the middle part of the bottom wall of the machine 1, and the worm wheel 304 is fixedly sleeved in the middle part of the rotating column 303. The motor 301 is arranged on the bottom wall of the machine 1, and the right end of the output shaft of the motor 301 is fixedly connected to the worm 302. The worm 302 is meshed with the worm wheel 304. The input end of the motor 301 is electrically connected to the output end of the control switch group 6. The rotating and fixing mechanism 3 also includes a turntable 305, a support block 306 and a sliding clamp block 307. The turntable 305 is fixedly connected to the upper end of the rotating column 303, and the outer arc surface of the turntable 305 is in contact with the circular The inner wall of the avoidance opening is rotatably connected, and the upper end of the turntable 305 is provided with evenly distributed support blocks 306, and the sliding grooves on the upper surfaces of the support blocks 306 are respectively slidably connected with horizontally symmetrical sliding clamps 307. The rotation fixing mechanism 3 also includes a slide bar 308 and a spring 309. The sides of the outer sliding clamps 307 are fixedly connected with two slide bars 308, and the inner ends of the two slide bars 308 are slidably connected with the sliding holes of the inner sliding clamps 307. A spring 309 is fixedly connected between the two horizontally symmetrical sliding clamps 307, and the springs 309 are respectively sleeved on the outside of the slide bars 308. A connecting strip is fixedly connected between the inner ends of the two adjacent slide bars 308 in front and behind. The rotation fixing mechanism 3 also includes a rotating shaft 310, a rotating strip 311 and a motor 312. The upper end of the disk 305 is rotatably connected with a uniformly distributed rotating shaft 310, and the upper ends of the rotating shafts 310 are fixedly connected with rotating bars 311. The outer arc surfaces of the rotating bars 311 are slidably connected with the adjacent connecting bars and the inner sliding clamping block 307 respectively. The second motor 312 is respectively arranged at the lower end of the turntable 305, and the upper ends of the output shafts of the second motor 312 are respectively fixedly connected with the lower ends of the rotating shafts 310. The rotating bars 311 are all located on the left side of the connecting bars. The input end of the second motor 312 is electrically connected to the output end of the control switch group 6. First, by placing the unfilled lithium battery in the middle of the support block 306, and then by regulating the control switch group 6, the second motor 312 is operated, and the output shaft of the second motor 312 drives the rotating shaft 310 to rotate, and the rotating shaft 310 drives the rotating bar 3 11 rotates, when the rotating bar 311 rotates, the farthest end of the rotating bar 311 away from the rotating shaft 310 contacts the right side surface of the right end sliding clamp 307 and the left side surface of the connecting bar respectively, so that the right end sliding clamp 307 is pushed to the left, so that the connecting bar is pulled to the right, and the connecting bar then pulls the slide bar 308, and the slide bar 308 pulls the left end sliding clamp 307 to the right, thereby fixing and clamping the unfilled lithium battery, and then by regulating the control switch group 6, the motor 1 301 is operated, the output shaft of the motor 1 301 drives the worm 302 to rotate, the worm 302 drives the meshing worm wheel 304 to rotate, the rotating column 303 driven by the worm wheel 304 rotates, and then drives the turntable 305 to rotate, so that the unfilled lithium battery is rotated to the lower end of the injection needle 511;

[0029] Injection mechanism 5: It includes a sliding plate 502, a piston 507, a one-way valve 508, a feed pipe 509 and a barrel 510. The rear end of the sliding plate 502 is slidably connected to the slide groove opened on the front side of the support rod 4. The upper front side of the sliding plate 502 is provided with a barrel 510. The piston 507 is slidably connected inside the barrel 510. A feed pipe 509 is provided at the feed port of the outer wall of the barrel 510. The middle part of the feed pipe 509 is connected in series with a one-way valve 508. The injection mechanism 5 also includes a bracket 504, a hydraulic cylinder 505, a support rod 506, an electric one-way valve 512 and an injection needle 511. The bracket 504 is arranged on the sliding plate 50 2, a hydraulic cylinder 505 is provided at the upper end of the bracket 504, a support rod 506 is fixedly connected to the lower end of the hydraulic cylinder 505, and the lower end of the support rod 506 is fixedly connected to the middle part of the upper end of the piston 507, an electric one-way valve 512 is provided at the discharge port of the barrel 510, and an injection needle 511 is fixedly connected to the lower end of the electric one-way valve 512, an input end of the hydraulic cylinder 505 is connected to an external hydraulic pump, and an input end of the electric one-way valve 512 is electrically connected to an output end of the control switch group 6, and the injection mechanism 5 also includes a motor 3 501 and a screw rod 503, the screw rod 503 is rotatably connected to the slide groove opened on the front side of the support rod 4, and the motor 3 501 is arranged at the upper end of the support rod 4, the lower end of the output shaft of the motor 3 501 is fixedly connected to the upper end of the screw rod 503, the threaded hole at the rear end of the sliding plate 502 is threadedly connected to the screw rod 503, the input end of the motor 3 501 is electrically connected to the output end of the control switch group 6, by adjusting the control switch group 6, the motor 3 501 operates, the output shaft of the motor 3 501 drives the screw rod 503 to rotate, the screw rod 503 drives the threaded sliding plate 502 to move up and down, the sliding plate 502 moves the injection needle 511 down to the top of the lithium battery that has not been injected, the control switch group 6 is adjusted, the external hydraulic pump pressurizes the hydraulic cylinder 505, the hydraulic The cylinder 505 drives the support rod 506 to move up and down, and the support rod 506 drives the piston 507 to move up and down. The one-way valve 508 only allows inflow but not outflow, and the electric one-way valve 512 only allows outflow but not inflow. When the piston 507 slides downward on the inner wall of the barrel 510, the electric one-way valve 512 opens, and the liquid at the lower end of the piston 507 is injected into the lithium battery through the injection needle 511. When the liquid needs to be refilled after a certain period of time, the electric one-way valve 512 opens, the piston 507 moves up, and the volume of the barrel 510 at the bottom of the piston 507 increases and the pressure decreases until the piston 507 is higher than the feed port, and the liquid enters the barrel 510 through the feed pipe 509.

[0030] The working principle of the liquid injection device for lithium battery production provided by the utility model is as follows: first, the unfilled lithium battery is placed in the middle of the support block 306, and then the control switch group 6 is adjusted to operate the motor 2 312, the output shaft of the motor 2 312 drives the rotating shaft 310 to rotate, and the rotating shaft 310 drives the rotating bar 311 to rotate. When the rotating bar 311 rotates, the farthest end of the rotating bar 311 away from the rotating shaft 310 contacts the right side surface of the right end sliding clamp 307 and the left side surface of the connecting bar respectively. The sliding clamp 307 at the right end is pushed to the left, so that the connecting strip is pulled to the right, and the connecting strip then pulls the slide bar 308, and the slide bar 308 pulls the sliding clamp 307 at the left end to the right, thereby fixing and clamping the lithium battery that has not been injected with liquid. Then, by regulating the control switch group 6, the motor 1 301 is operated, and the output shaft of the motor 1 301 drives the worm 302 to rotate, and the worm 302 drives the meshing worm wheel 304 to rotate, and the rotating column 303 driven by the worm wheel 304 rotates, thereby driving the turntable 305 to rotate, so that the lithium battery that has not been injected with liquid is fixed. The lithium battery rotates to the lower end of the injection needle 511, and the control switch group 6 is adjusted to operate the motor 3 501. The output shaft of the motor 3 501 drives the screw rod 503 to rotate, and the screw rod 503 drives the threaded sliding plate 502 to move up and down. The sliding plate 502 moves the injection needle 511 down to the top of the lithium battery that has not been injected. Then, the control switch group 6 is adjusted, and the external hydraulic pump pressurizes the hydraulic cylinder 505. The hydraulic cylinder 505 drives the support rod 506 to move up and down, and the support rod 506 drives the piston 507 to move up and down. The one-way valve 508 only allows liquid to flow in but not out, and the electric one-way valve 512 only allows liquid to flow out but not in. When the piston 507 slides downward on the inner wall of the barrel 510, the electric one-way valve 512 opens, and the liquid at the lower end of the piston 507 is injected into the lithium battery through the injection needle 511. When liquid needs to be refilled after a certain period of time, the electric one-way valve 512 opens, and the piston 507 moves upward. The volume of the barrel 510 at the bottom of the piston 507 increases and the pressure decreases, until the piston 507 is higher than the feed port, and the liquid enters the barrel 510 through the feed pipe 509.

[0031] It is worth noting that the motor 1 301, motor 2 312, motor 3 501 and electric one-way valve 512 disclosed in the above embodiments, motor 1 301 and motor 3 501 can both use V5-040130FC2A, motor 2 312 can use 81KS-370, electric one-way valve 512 can use V2068-A11-OM, and the control switch group 6 is provided with switch buttons corresponding to motor 1 301, motor 2 312, motor 3 501 and electric one-way valve 512 for controlling their switching operation.

[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid injection device for lithium battery production, characterized in that: It comprises a machine platform (1), a rotating and fixing mechanism (3) and a liquid injection mechanism (5); The machine platform (1) has legs (2) at the four corners of its lower end, and a support rod (4) is provided at the rear end of the upper surface of the machine platform (1); Rotating fixing mechanism (3): it is arranged at the upper end of the machine platform (1); The liquid injection mechanism (5) comprises a sliding plate (502), a piston (507), a one-way valve (508), a feed pipe (509) and a barrel (510). The rear end of the sliding plate (502) is slidably connected to a slide groove provided on the front side of the support rod (4). The barrel (510) is provided on the front side of the upper end of the sliding plate (502). The piston (507) is slidably connected inside the barrel (510). A feed pipe (509) is provided at the feed port of the outer wall of the barrel (510). The middle part of the feed pipe (509) is connected in series with a one-way valve (508).

2. A liquid injection device for lithium battery production according to claim 1, characterized in that: A control switch group (6) is provided on the left side of the front end of the machine (1), and an input end of the control switch group (6) is electrically connected to an external power supply.

3. A liquid injection device for lithium battery production according to claim 2, characterized in that: The rotating fixing mechanism (3) comprises a motor 1 (301), a worm (302), a rotating column (303) and a worm wheel (304); the lower end of the rotating column (303) is rotatably connected to the middle part of the bottom wall of the machine platform (1); the worm wheel (304) is fixedly sleeved on the middle part of the rotating column (303); the motor 1 (301) is arranged on the bottom wall of the machine platform (1); the right end of the output shaft of the motor 1 (301) is fixedly connected to the worm (302); the worm (302) and the worm wheel (304) are meshingly connected; the input end of the motor 1 (301) is electrically connected to the output end of the control switch group (6).

4. A liquid injection device for lithium battery production according to claim 3, characterized in that: The rotating fixing mechanism (3) further comprises a rotating disk (305), a supporting block (306) and a sliding clamping block (307); the rotating disk (305) is fixedly connected to the upper end of the rotating column (303); the outer arc surface of the rotating disk (305) is rotatably connected to the inner wall of a circular avoidance opening provided on the upper surface of the machine platform (1); the upper end of the rotating disk (305) is provided with evenly distributed supporting blocks (306); and the sliding grooves on the upper surfaces of the supporting blocks (306) are respectively slidably connected to horizontally symmetrical sliding clamping blocks (307).

5. A liquid injection device for lithium battery production according to claim 4, characterized in that: The rotating fixing mechanism (3) further comprises a sliding rod (308) and a spring (309); the side surfaces of the outer sliding clamping block (307) are fixedly connected to two sliding rods (308); the inner ends of the two sliding rods (308) are slidably connected to the sliding holes of the inner sliding clamping block (307); a spring (309) is fixedly connected between the two horizontally symmetrical sliding clamping blocks (307); the springs (309) are respectively sleeved on the outside of the sliding rods (308); and a connecting strip is fixedly connected between the inner ends of the two front and rear adjacent sliding rods (308).

6. A liquid injection device for lithium battery production according to claim 5, characterized in that: The rotating fixing mechanism (3) further comprises a rotating shaft (310), a rotating bar (311) and a second motor (312); the upper end of the rotating disk (305) is rotatably connected to the evenly distributed rotating shafts (310); the upper ends of the rotating shafts (310) are fixedly connected to the rotating bars (311); the outer arc surfaces of the rotating bars (311) are respectively slidably connected to the adjacent connecting bars and the inner sliding clamping block (307); the second motor (312) is respectively arranged at the lower end of the rotating disk (305); the upper ends of the output shafts of the second motors (312) are respectively fixedly connected to the lower ends of the rotating shafts (310); the rotating bars (311) are all located on the left side of the connecting bars; and the input end of the second motor (312) is electrically connected to the output end of the control switch group (6).

7. A liquid injection device for lithium battery production according to claim 2, characterized in that: The injection mechanism (5) further comprises a bracket (504), a hydraulic cylinder (505), a support rod (506), an electric one-way valve (512) and an injection needle (511); the bracket (504) is arranged at the upper end of the sliding plate (502); the upper end of the bracket (504) is provided with a hydraulic cylinder (505); the lower end of the hydraulic cylinder (505) is fixedly connected to the support rod (506); the lower end of the support rod (506) is fixedly connected to the middle part of the upper end of the piston (507); the discharge port of the barrel (510) is provided with an electric one-way valve (512); the lower end of the electric one-way valve (512) is fixedly connected to the injection needle (511); the input end of the hydraulic cylinder (505) is connected to an external hydraulic pump; the input end of the electric one-way valve (512) is electrically connected to the output end of the control switch group (6).

8. A liquid injection device for lithium battery production according to claim 2, characterized in that: The injection mechanism (5) further comprises a motor three (501) and a screw rod (503), wherein the screw rod (503) is rotatably connected to a slide groove provided on the front side of the support rod (4), the motor three (501) is arranged at the upper end of the support rod (4), the lower end of the output shaft of the motor three (501) is fixedly connected to the upper end of the screw rod (503), the threaded hole at the rear end of the sliding plate (502) is threadedly connected to the screw rod (503), and the input end of the motor three (501) is electrically connected to the output end of the control switch group (6).

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