Electrolyte injection equipment of lithium battery

Abstract

The invention belongs to the technical field of lithium battery production, and particularly relates to lithium battery electrolyte injection equipment which comprises a conveyor. A cross beam is arranged above the conveyor; a plurality of liquid injection units are uniformly arranged on the cross beam; the liquid injection unit comprises a transverse plate; vertical plates are fixedly connected to the two sides of the bottom face of the transverse plate. A filling needle is arranged in the middle of the bottom surface of the transverse plate; a shifting plate is rotationally mounted at the bottom of the vertical plate; a driving assembly is arranged on one side of the vertical plate; the shifting plates on the two sides rotate in the opposite directions of the two sides, the shifting plates on the two sides are opened in a splayed shape to open the top opening of the shell, and the filling needle is located between the shifting plates on the two sides, so that the filling needle can be accurately inserted into the top opening of the shell after the top opening of the shell is opened. Therefore, the electrolyte can be accurately injected into the shell, and the probability that the electrolyte flows out of the shell and leaks is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium battery production, in particular to an electrolyte injection device for a lithium battery. Background Art

[0002] A lithium battery is a battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium battery and is the guarantee for the lithium-ion battery to achieve advantages such as high voltage and high specific energy. The electrolyte is generally made of high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials, prepared under certain conditions and in a certain proportion.

[0003] A Chinese patent application with application number CN201410361268.8 discloses a lithium battery electrolyte filling device, including a frame and a filling device body, the filling device body including an upper and a lower filling cup body; a receiving cavity is formed in the upper filling cup body, a leakage port is opened at the bottom of the receiving cavity, a filling cup blocking needle is arranged in the receiving cavity to be adapted to the leakage port in an openable and closable manner; a vacuum filling cavity is opened in the lower filling cup body, the vacuum filling cavity is connected to a vacuum interface, and a vacuum filling cavity is provided. A liquid-filling cup body is provided with a liquid-passing needle, the upper end of the liquid-passing needle of the liquid-filling cup body is connected to the aforementioned leakage port, and the lower end of the lower liquid-filling cup body has a liquid-filling port adapted to the battery, and the liquid-filling port and the opening at the lower end of the liquid-passing needle of the liquid-filling cup body are spaced opposite to each other in the upper and lower directions; thereby, by designing the liquid-filling device as a "double-layer" liquid-filling cup body structure, the time for liquid to be injected into the battery can be effectively shortened, the service life of the sealing part in the cup body can be improved, the stability and reliability of the liquid-filling accuracy can be ensured, the equipment maintenance time and cost can be reduced, and the utilization rate of the equipment can be improved.

[0004] The shell of the soft-pack lithium battery is an aluminum-plastic composite film, which makes the shell of the soft-pack lithium battery relatively soft. When the electrolyte is injected into the soft-pack lithium battery, the opening of the shell of the soft-pack lithium battery will produce different deformations and bends, which can easily block the filling needle from entering the shell of the soft-pack lithium battery, causing the electrolyte to flow out of the shell of the soft-pack lithium battery, resulting in an electrolyte leakage accident.

[0005] To this end, the present invention provides an electrolyte injection device for a lithium battery. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the electrolyte injection equipment of a lithium battery described in the present invention comprises a conveyor; the conveyor is used to convey the shell of a soft-pack lithium battery; a crossbeam is arranged above the conveyor; a plurality of injection units are evenly arranged on the crossbeam, and the injection units are used to inject electrolyte into the interior of the shell; the injection unit comprises a filling needle, a dial plate and a driving assembly; dial plates are rotatably arranged on both sides of the filling needle; the driving assembly is used to drive the dial plates to rotate; the dial plates on both sides rotate in opposite directions on both sides, and the dial plates on both sides are opened in an eight-shaped shape to open the top opening of the shell, and because the filling needle is located between the dial plates on both sides, after the top opening of the shell is opened, the filling needle can be accurately inserted into the top opening of the shell, so that the electrolyte can be accurately injected into the interior of the shell, effectively reducing the probability of electrolyte flowing out of the shell and leaking.

[0008] Preferably, the injection unit also includes a horizontal plate; vertical plates are fixedly connected on both sides of the bottom surface of the horizontal plate; the filling needle is arranged in the middle of the bottom surface of the horizontal plate; the shift plate is rotatably installed at the bottom of the vertical plate; the driving assembly includes a face gear; the face gear is fixedly connected to the outer ring of the rotating shaft on one side of the shift plate; the side of the vertical plate close to the face gear is fixedly connected to motor No. 1; the outer ring of the rotating shaft of motor No. 1 is fixedly connected to gear No. 1; the gear No. 1 is meshed with the face gear; the shift plates on both sides are rotated to close and unfold.

[0009] Preferably, the top surface of the crossbeam is fixedly connected to a No. 1 hydraulic cylinder; the bottom end of the piston rod of the No. 1 hydraulic cylinder is fixedly connected to the top surface of the cross plate; thereby realizing the lifting and lowering of the injection unit.

[0010] Preferably, a No. 1 hollow column is fixedly connected to the middle of the bottom surface of the horizontal plate; a No. 2 hollow column is slidably installed inside the No. 1 hollow column; a No. 2 hydraulic cylinder is fixedly connected between the inner bottom end of the No. 2 hollow column and the bottom surface of the horizontal plate; the bottom end of the No. 2 hollow column is fixedly connected to the top end of the filling needle; this further avoids the leakage of electrolyte from the inside of the shell.

[0011] Preferably, a half-shell is fixedly connected to the middle of one side of the shift plates on both sides close to the filling needle; the two half-shells can wrap the bottom of the filling needle; the inner circles of the openings of the two half-shells close to each other are fixed with rubber sealing rings; the top of one half-shell is connected to a gas tank filled with inert gas through a pipeline; thereby effectively avoiding the dangerous situation of a small amount of electrolyte leakage from the filling needle.

[0012] Preferably, a plurality of fixing units are evenly arranged on the top of the conveyor, and the fixing units are used to fix the shell; the fixing units include a mounting seat; the mounting seat is fixedly installed on the top of the conveyor; a placement box is bolted to the top surface of the mounting seat; the shell is fixedly placed inside the placement box; the shell is convenient for fixed transportation, reduces the deformation of the shell during transportation and filling of electrolyte, and improves the accuracy of electrolyte filling.

[0013] Preferably, side clamping assemblies are provided on both sides of the interior of the placement box, and the side clamping assemblies are used to clamp the sides of the shell; the side clamping assembly includes a cavity opened at the bottom of the placement box; a pair of No. 1 slide grooves are opened at both ends of the inner bottom surface of the placement box; a slide plate is slidably installed inside the No. 1 slide groove; the bottom end of the slide plate is bolted to a panel; the protrusions of the two panels are in opposite directions; the side of the protrusions of the two panels that are close to each other is fixedly connected to a No. 3 hydraulic cylinder; the other end of the No. 3 hydraulic cylinder is fixedly connected to the side wall of the cavity; a conical clamping strip is provided on the side of the slide plate close to the middle of the mounting seat; thereby effectively reducing the shaking and displacement of the shell during transportation.

[0014] Preferably, one side of the slide is provided with a mounting block; the mounting block is fixedly connected to a plurality of slides on one side near the middle of the mounting seat; the outer ring of the slide is surrounded by a plurality of through grooves; the outer ring of the slide is fixedly connected to a No. 1 convex ring at one end away from the mounting block; a slide rod is slidably mounted on the inside of the slide; the slide rod is fixedly connected to a No. 2 convex ring near the outer ring of the mounting block; the No. 2 convex ring is sleeved on the outer ring of the slide; the inner ring of the No. 2 convex ring is fixed with a plurality of protrusions, and the protrusion of the No. 2 convex ring slides through the through groove; a spring is provided between the No. 2 convex ring and the No. 1 convex ring; the spring is sleeved on the outer ring of the slide; one end of the plurality of slide rods near the middle of the placement box is fixedly connected to a mounting plate; the close side of the two mounting plates is bolted to the conical clamping bar; thereby effectively reducing the leakage of the internal electrolyte when the shell moves.

[0015] Preferably, a fixing groove is provided in the middle of the slide plate; the mounting block is fixedly mounted by a plurality of bolts passing through the fixing groove; thereby facilitating the clamping and fixing of shells of different heights, thereby improving the applicability of the side clamping assembly.

[0016] Preferably, the inner bottom surface of the placement box is provided with a bottom edge clamping assembly, and the bottom edge clamping assembly is used to clamp the bottom edge of the shell; the bottom edge clamping assembly includes multiple pairs of No. 2 slide grooves on both sides of the inner bottom surface of the placement box; a two-way screw rod is rotatably installed inside the middle pair of No. 2 slide grooves; a slider is slidably installed inside the No. 2 slide groove; the two-way screw rod is threadedly matched with the slider; the middle bottom surface of the cavity is fixedly connected to the No. 2 motor; the outer ring of the rotating shaft of the No. 2 motor and the middle outer ring of the two-way screw rod are both fixedly connected to the No. 2 gear; the two No. 2 gears are meshed with each other; the tops of multiple sliders are fixedly connected to arc-shaped brackets; the tops of the arc-shaped brackets are bent toward the middle of the placement box; the tops of the arc-shaped brackets are fixedly connected to rubber ridges; the shell is effectively fixed to the inside of the placement box.

[0017] The beneficial effects of the present invention are as follows: 1. The electrolyte injection device of a lithium battery described in the present invention comprises a conveyor, a horizontal plate, a vertical plate, a filling needle, a paddle plate, a face gear, a No. 1 motor and a No. 1 gear; the conveyor conveys the shell to be injected with electrolyte to the bottom of the liquid injection unit, at this time, the paddle plates on both sides are in a state of close contact, and the bottoms of the paddle plates are in contact; the bottoms of the paddle plates on both sides are inserted into the top opening of the shell, the No. 1 motor drives the No. 1 gear to rotate, drives the face gear to rotate, drives the paddle plates to rotate, and the paddle plates on both sides rotate in opposite directions on both sides, and the paddle plates on both sides are opened in an eight-shaped shape to open the top opening of the shell, and because the filling needle is located between the paddle plates on both sides, the filling needle can be accurately inserted into the top opening of the shell after the top opening of the shell is opened, so that the electrolyte can be accurately injected into the interior of the shell, effectively reducing the probability of electrolyte flowing out of the shell and leaking.

[0018] 2. The lithium battery electrolyte injection device described in the present invention includes a half-shell and a rubber sealing ring; when the electrolyte is not being added, the No. 2 hydraulic cylinder is in a retracted state, driving the filling needle to be between the shifting plates on both sides, and the filling needle is located between the half-shells on both sides; the half-shells on both sides are pushed by the shifting plates on both sides, so that the half-shells on both sides are closed to surround the filling needle, and the rubber sealing rings on both sides are squeezed and contacted to seal the gap between the half-shells on both sides; when the electrolyte is not needed for a long time, the inert gas inside the gas storage tank is transported to the inside of the half-shells on both sides through the pipeline, so that the area around the filling needle is filled with inert gas; thereby effectively avoiding the dangerous situation of a small amount of electrolyte leakage from the filling needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a perspective view of the present invention; Figure 2 is a three-dimensional diagram of the liquid injection unit and the fixing unit in the present invention; Figure 3 is a perspective view of the liquid injection unit of the present invention; Figure 4 It is an exploded view of the liquid injection unit in the present invention; Figure 5 It is a three-dimensional diagram of the half housing and the rubber sealing ring in the present invention; Figure 6 is a three-dimensional diagram of the fixing unit of the present invention; Figure 7 is an exploded view of the fixing unit in the present invention; Figure 8 It is the internal structure diagram of the placement box in the present invention; Figure 9 is a top view of the fixing unit of the present invention; Figure 10 is a perspective view of the side clamping assembly of the present invention; Figure 11 It is a three-dimensional diagram of the slide in the present invention; Figure 12 It is an exploded view of the slide in the present invention; Figure 13 is a perspective view of the bottom edge clamping assembly of the present invention; Figure: 1. Conveyor; 2. Housing; 3. Crossbeam; 4. Cross plate; 5. Vertical plate; 6. Filling needle; 7. Dial plate; 8. Face gear; 9. Motor No. 1; 10. Gear No. 1; 11. Hydraulic cylinder No. 1; 12. Hollow column No. 1; 13. Hollow column No. 2; 14. Hydraulic cylinder No. 2; 15. Half housing; 16. Rubber seal; 17. Mounting base; 18. Placement box; 19. Cavity; 20. Chute No. 1; 21. Slide plate; 22. Panel; 23. Hydraulic cylinder No. 3; 24. Conical clamping strip; 25. Mounting block; 26. Slide cylinder; 27. Through groove; 28. No. 1 raised ring; 29. ​​Slide rod; 30. No. 2 raised ring; 31. Spring; 32. Mounting plate; 33. Fixed groove; 34. No. 2 slide groove; 35. Bidirectional screw rod; 36. Slider; 37. No. 2 motor; 38. No. 2 gear; 39. Arc bracket; 40. Rubber convex strip. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figures 1 to 4As shown, an electrolyte injection device for a lithium battery according to an embodiment of the present invention includes a conveyor 1; the conveyor 1 is used to convey the shell 2 of a soft-pack lithium battery; a crossbeam 3 is provided above the conveyor 1; a plurality of injection units are evenly provided on the crossbeam 3, and the injection units are used to inject electrolyte into the interior of the shell 2; the injection units include a filling needle 6, a dial plate 7 and a drive assembly; the dial plates 7 are rotatably provided on both sides of the filling needle 6; the drive assembly is used to drive the dial plates 7 to rotate; During operation, the conveyor 1 conveys the shell 2 to be injected with electrolyte to the bottom of the injection unit. At this time, the paddles 7 on both sides are in a state of close contact, and the bottoms of the paddles 7 are in contact; the injection unit descends, driving the filling needle 6 and the paddle 7 to descend, so that the bottoms of the paddles 7 on both sides are inserted into the top opening of the shell 2, and the driving component drives the paddle 7 to rotate, and the paddles 7 on both sides rotate in opposite directions on both sides. The paddles 7 on both sides open in an eight-shaped shape, opening the top opening of the shell 2, and because the filling needle 6 is located between the paddles 7 on both sides, after the top opening of the shell 2 is opened, the filling needle 6 can be accurately inserted into the top opening of the shell 2, so that the electrolyte can be accurately injected into the interior of the shell 2, effectively reducing the probability of electrolyte flowing out of the shell 2 and leaking.

[0023] like Figures 2 to 4 As shown, the injection unit also includes a horizontal plate 4; vertical plates 5 are fixed on both sides of the bottom surface of the horizontal plate 4; the filling needle 6 is arranged in the middle of the bottom surface of the horizontal plate 4; the dial plate 7 is rotatably installed at the bottom of the vertical plate 5; the driving assembly includes a face gear 8; the face gear 8 is fixed to the outer ring of the rotating shaft on one side of the dial plate 7; the side of the vertical plate 5 close to the face gear 8 is fixed with a No. 1 motor 9; the outer ring of the rotating shaft of the No. 1 motor 9 is fixed with a No. 1 gear 10; the No. 1 gear 10 is meshed with the face gear 8; when working, the No. 1 motor 9 drives the No. 1 gear 10 to rotate, drives the face gear 8 to rotate, and drives the dial plate 7 to rotate, thereby realizing the rotation, closing and unfolding of the dial plates 7 on both sides.

[0024] like Figures 2 to 4 As shown, the top surface of the cross beam 3 is fixedly connected to the No. 1 hydraulic cylinder 11; the bottom end of the piston rod of the No. 1 hydraulic cylinder 11 is fixedly connected to the top surface of the cross plate 4; when working, the No. 1 hydraulic lever 11 pushes the cross plate 4 to move up and down, thereby realizing the lifting and lowering of the injection unit.

[0025] like Figures 2 to 4 As shown, a first hollow column 12 is fixedly connected to the middle of the bottom surface of the horizontal plate 4; a second hollow column 13 is slidably mounted inside the first hollow column 12; a second hydraulic cylinder 14 is fixedly connected between the inner bottom end of the second hollow column 13 and the bottom surface of the horizontal plate 4; the bottom end of the second hollow column 13 is fixedly connected to the top end of the filling needle 6; During operation, after the paddles 7 on both sides open the top opening of the shell 2, the No. 2 hydraulic cylinder 14 pushes the No. 2 hollow column 13 to slide downward along the No. 1 hollow column 12, pushing the filling needle 6 downward, so that the filling needle 6 is inserted into the top opening of the shell 2, thereby further preventing the electrolyte from flowing out from the inside of the shell 2 and leaking.

[0026] like Figures 2 to 5 As shown, a half-shell 15 is fixedly connected to the middle of the side of the shift plate 7 on both sides close to the filling needle 6; the two half-shells 15 can wrap the bottom of the filling needle 6; the inner rings of the openings of the two half-shells 15 close to each other are fixedly connected to a rubber sealing ring 16; the top of one of the half-shells 15 is connected to a gas tank filled with inert gas through a pipe; During operation, when electrolyte is not being added, the No. 2 hydraulic cylinder 14 is in a retracted state, driving the filling needle 6 between the two side shift plates 7, and the filling needle 6 is located between the two side half-shells 15; the two side half-shells 15 are pushed by the two side shift plates 7, so that the two side half-shells 15 are closed, surrounding the filling needle 6, and the gap between the two side half-shells 15 is sealed by the compression contact of the two side rubber sealing rings 16; when electrolyte filling is not required for a long time, the inert gas inside the gas storage tank is transported to the inside of the two side half-shells 15 through the pipeline, so that the area around the filling needle 6 is filled with inert gas; thereby effectively avoiding the dangerous situation of a small amount of electrolyte leakage from the filling needle 6; When filling the electrolyte, the paddles 7 on both sides open the top opening of the housing 2, driving the half-shells 15 on both sides to separate, exposing the filling needle 6 for filling.

[0027] like Figure 1 、 Figure 2 and Figure 6 As shown, a plurality of fixing units are evenly arranged on the top of the conveyor 1, and the fixing units are used to fix the housing 2; the fixing units include a mounting seat 17; the mounting seat 17 is fixedly installed on the top of the conveyor 1; a placement box 18 is bolted to the top surface of the mounting seat 17; the housing 2 is fixedly placed inside the placement box 18; During operation, a plurality of mounting seats 17 are evenly installed on the top of the conveyor 1, and the placement box 18 is fixedly installed on the mounting seat 17. The shell 2 is placed through the placement box 18, so that the shell 2 can be conveniently fixed and conveyed, reducing the deformation of the shell 2 during transportation and filling of electrolyte, and improving the accuracy of electrolyte filling.

[0028] like Figures 6 to 12As shown, side clamping assemblies are provided on both sides of the interior of the placement box 18, and the side clamping assemblies are used to clamp the side of the shell 2; the side clamping assembly includes a cavity 19 opened at the bottom of the placement box 18; a pair of No. 1 slide grooves 20 are opened at both ends of the inner bottom surface of the placement box 18; a slide plate 21 is slidably installed inside the No. 1 slide groove 20; a panel 22 is bolted to the bottom end of the slide plate 21; the protrusions of the two panels 22 are in opposite directions; a No. 3 hydraulic cylinder 23 is fixed to the side where the protrusions of the two panels 22 are close to each other; the other end of the No. 3 hydraulic cylinder 23 is fixed to the side wall of the cavity 19; a conical clamping strip 24 is provided on the side of the slide plate 21 close to the middle of the mounting seat 17; The cam 26 is provided with a plurality of guide rails 26 on one side of the slide 21; the guide rail 26 is fixedly connected to a plurality of slides 26 on one side near the middle of the mounting seat 17; the outer ring of the slide 26 is surrounded by a plurality of through grooves 27; the outer ring of the slide 26 is fixedly connected to a No. 1 convex ring 28 at one end away from the mounting block 25; a slide rod 29 is slidably mounted on the inside of the slide 26; the slide rod 29 is fixedly connected to a No. 2 convex ring 30 near the outer ring of the mounting block 25; the No. 2 convex ring 30 is sleeved on the outer ring of the slide 26; the inner ring of the No. 2 convex ring 30 is fixedly connected to a plurality of protrusions, and the protrusions of the No. 2 convex ring 30 slide through the through groove 27; a spring 31 is provided between the No. 2 convex ring 30 and the No. 1 convex ring 28; the spring 31 is sleeved on the outer ring of the slide 26; one end of the plurality of slide rails 29 near the middle of the placement box 18 is fixedly connected to a mounting plate 32; the adjacent sides of the two mounting plates 32 are bolted to the conical clamping bar 24; A fixing groove 33 is formed in the middle of the slide plate 21; the mounting block 25 is fixedly mounted by a plurality of bolts passing through the fixing groove 33; During operation, when the shell 2 is placed inside the placement box 18, the No. 3 hydraulic cylinder 23 pushes the panel 22 and the slide 21 to slide along the slide 20, and the slides 221 on both sides move closer to each other, driving the mounting block 25, the slide 26 and the slide rod 29 to move, driving the conical clamping strips 24 on both sides to clamp and fix the two side edges of the shell 2, thereby effectively reducing the shaking and displacement of the shell 2 during transportation; When the paddles 7 on both sides open the top opening of the housing 2, the top edges of the housing 2 move toward the middle of the housing 2, driving the conical clamping strips 24 on both sides to move, driving the slide rod 29 to slide out from the inside of the slide cylinder 26, driving the second protruding ring 30 to slide toward the first protruding ring 28, causing the spring 31 to compress and accumulate force; When the electrolyte filling of the housing 2 is completed, the paddles 7 on both sides are moved out of the top opening of the housing 2, and the spring 31 is reset, pushing the second convex ring 30 and the slide rod 29 to slide toward the inside of the slide cylinder 26, driving the conical clamping strip 24 to slide, pulling the top edges of the housing 2 toward the sides of the housing 2, pulling the top opening of the housing 2 smaller, thereby effectively reducing the leakage of the electrolyte inside when the housing 2 is moved; The fixing groove 33 provided on the slide plate 21 facilitates the staff to adjust the height of the mounting block 25 along the fixing groove 33 and control and adjust the height of the conical clamping strip 24, thereby facilitating the clamping and fixing of the housings 2 of different heights, thereby improving the applicability of the side clamping assembly.

[0029] like Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 13 As shown, the inner bottom surface of the placement box 18 is provided with a bottom edge clamping assembly, and the bottom edge clamping assembly is used to clamp the bottom edge of the shell 2; the bottom edge clamping assembly includes multiple pairs of No. 2 slide grooves 34 opened on both sides of the inner bottom surface of the placement box 18; a two-way screw rod 35 is rotatably installed inside the middle pair of No. 2 slide grooves 34; a slider 36 is slidably installed inside the No. 2 slide groove 34; the two-way screw rod 35 is threadedly matched with the slider 36; the middle bottom surface of the cavity 19 is fixedly connected to the No. 2 motor 37; the outer ring of the rotating shaft of the No. 2 motor 37 and the middle outer ring of the two-way screw rod 35 are both fixedly connected to the No. 2 gear 38; the two No. 2 gears 38 mesh with each other; the tops of multiple sliders 36 are fixedly connected to arc brackets 39; the tops of the arc brackets 39 are bent toward the middle of the placement box 18; the tops of the arc brackets 39 are fixedly connected to rubber ridges 40; During operation, when the shell 2 is placed inside the placement box 18, the No. 2 motor 37 is driven through the two No. 2 gears 38 to mesh and drive the bidirectional screw 35 to rotate, driving the sliders 36 on both sides to slide close to each other along the No. 2 slide groove 34, driving the arc-shaped brackets 39 on both sides to approach each other, and driving the rubber ridges 40 on both sides to clamp and fix the bottom of the shell 2, thereby effectively fixing the shell 2 inside the placement box 18.

[0030] Working principle: Multiple mounting seats 17 are evenly installed on the top of the conveyor 1, and the placement box 18 is fixedly installed on the mounting seats 17; when the shell 2 is placed inside the placement box 18, the No. 2 motor 37 is driven by the two No. 2 gears 38 to mesh and drive the bidirectional screw 35 to rotate, driving the sliders 36 on both sides to slide along the No. 2 slide 34, driving the arc-shaped brackets 39 on both sides to approach, and driving the rubber ridges 40 on both sides to clamp and fix the bottom of the shell 2; at the same time, the No. 3 hydraulic cylinder 23 pushes the panel 22 and the slide 21 to slide along the slide 20, and the slides 221 on both sides move closer to each other, driving the mounting block 25, the slide 26 and the slide rod 29 to move, driving the tapered clamping strips 24 on both sides to clamp and fix the two side edges of the shell 2; At this time, the No. 2 hydraulic cylinder 14 is in a retracted state, driving the filling needle 6 between the two side shift plates 7, and the filling needle 6 is located between the two side half-shells 15; the two side half-shells 15 are pushed by the two side shift plates 7, so that the two side half-shells 15 are closed, surrounding the filling needle 6, and the gap between the two side half-shells 15 is sealed by the compression contact of the two side rubber sealing rings 16; when the electrolyte is not needed for a long time, the inert gas inside the gas storage tank is transported to the inside of the two side half-shells 15 through the pipeline, so that the area around the filling needle 6 is filled with inert gas; thereby effectively avoiding the dangerous situation of a small amount of electrolyte leakage from the filling needle 6; The conveyor 1 conveys the shell 2 to be injected with electrolyte to the bottom of the injection unit. At this time, the paddles 7 on both sides are in a state of close contact, and the bottoms of the paddles 7 are in contact. The No. 1 hydraulic lever 11 pushes the horizontal plate 4, the vertical plate 5, the filling needle 6 and the paddle 7 to descend, so that the bottoms of the paddles 7 on both sides are inserted into the top opening of the shell 2; the No. 1 motor 9 drives the No. 1 gear 10 to rotate, drives the face gear 8 to rotate, drives the paddle 7 to rotate, and the paddles 7 on both sides rotate in opposite directions on both sides. The paddles 7 on both sides open in an eight-shaped shape, and the top opening of the shell 2 is stretched open; the top two side edges of the shell 2 move toward the middle of the shell 2, driving the conical clamping strips 24 on both sides to move, driving the slide rod 29 to slide out from the inside of the slide cylinder 26, and driving the No. 2 convex ring 30 to slide toward the No. 1 convex ring 28, so that the spring 31 is compressed and stored; At the same time, the half-shells 15 on both sides are driven apart, exposing the filling needle 6 for filling. The second hydraulic cylinder 14 pushes the second hollow column 13 to slide downward along the first hollow column 12, pushing the filling needle 6 downward so that the filling needle 6 is inserted into the top opening of the outer shell 2. This allows the electrolyte to be accurately injected into the interior of the outer shell 2, effectively reducing the probability of electrolyte flowing out of the inner shell 2 and leaking. After the electrolyte filling of the housing 2 is completed, the No. 2 hydraulic cylinder 14 drives the filling needle 66 to rise; the No. 1 motor 9 reverses, driving the two side shift plates 7 to rotate and close, so that the two side half-shells 15 close together, surrounding the filling needle 6; the No. 1 hydraulic lever 11 drives the horizontal plate 4, the vertical plate 5, the filling needle 6 and the shift plate 7 to rise and move out of the top opening of the housing 2; At this time, the spring 31 is reset, pushing the second convex ring 30 and the slide rod 29 to slide toward the inside of the slide cylinder 26, driving the conical clamping strip 24 to slide, pulling the top side edges of the shell 2 toward the sides of the shell 2, pulling the top opening of the shell 2 smaller, thereby effectively reducing the leakage of the internal electrolyte when the shell 2 moves.

[0031] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery electrolyte injection device, comprising a conveyor (1); the conveyor (1) is used to convey the shell (2) of a soft-pack lithium battery; a crossbeam (3) is provided above the conveyor (1); and the device is characterized in that: A plurality of liquid injection units are evenly arranged on the crossbeam (3), and the liquid injection units are used to inject electrolyte into the interior of the housing (2); The liquid injection unit comprises a filling needle (6), a dial plate (7) and a drive assembly; the dial plates (7) are rotatably provided on both sides of the filling needle (6); and the drive assembly is used to drive the dial plates (7) to rotate.

2. The electrolyte injection device for a lithium battery according to claim 1, characterized in that: The injection unit further comprises a horizontal plate (4); vertical plates (5) are fixedly connected to both sides of the bottom surface of the horizontal plate (4); the filling needle (6) is arranged in the middle of the bottom surface of the horizontal plate (4); the dial plate (7) is rotatably mounted on the bottom of the vertical plate (5); The driving assembly comprises a face gear (8); the face gear (8) is fixedly connected to the outer ring of the rotating shaft on one side of the shift plate (7); a No. 1 motor (9) is fixedly connected to the side of the vertical plate (5) close to the face gear (8); the outer ring of the rotating shaft of the No. 1 motor (9) is fixedly connected to the No. 1 gear (10); the No. 1 gear (10) is meshed with the face gear (8).

3. The electrolyte injection device for a lithium battery according to claim 1, characterized in that: The top surface of the cross beam (3) is fixedly connected to a No. 1 hydraulic cylinder (11); the bottom end of the piston rod of the No. 1 hydraulic cylinder (11) is fixedly connected to the top surface of the cross plate (4).

4. The electrolyte injection device for a lithium battery according to claim 1, characterized in that: A first hollow column (12) is fixedly connected to the middle of the bottom surface of the horizontal plate (4); a second hollow column (13) is slidably mounted inside the first hollow column (12); a second hydraulic cylinder (14) is fixedly connected between the inner bottom end of the second hollow column (13) and the bottom surface of the horizontal plate (4); and the bottom end of the second hollow column (13) is fixedly connected to the top end of the filling needle (6).

5. The electrolyte injection device for a lithium battery according to claim 1, characterized in that: A half-shell (15) is fixedly connected to the middle of one side of the shift plates (7) on both sides close to the filling needle (6); the two half-shells (15) can wrap the bottom of the filling needle (6); the inner rings of the openings on the adjacent sides of the two half-shells (15) are fixedly connected to a rubber sealing ring (16); the top of one of the half-shells (15) is connected to a gas storage tank filled with inert gas through a pipeline.

6. The electrolyte injection device for a lithium battery according to claim 1, characterized in that: A plurality of fixing units are evenly arranged on the top of the conveyor (1), and the fixing units are used to fix and place the outer shell (2); The fixing unit comprises a mounting seat (17); the mounting seat (17) is fixedly mounted on the top of the conveyor (1); a placement box (18) is bolted to the top surface of the mounting seat (17); and the housing (2) is fixedly placed inside the placement box (18).

7. The electrolyte injection device for a lithium battery according to claim 6, characterized in that: Side clamping assemblies are provided on both sides of the interior of the placement box (18), and the side clamping assemblies are used to clamp the side of the shell (2); The side clamping assembly includes a cavity (19) opened at the bottom of the placement box (18); a pair of No. 1 slide grooves (20) are opened at both ends of the inner bottom surface of the placement box (18); a slide plate (21) is slidably installed inside the No. 1 slide groove (20); a panel (22) is bolted to the bottom end of the slide plate (21); the protrusions of the two panels (22) are in opposite directions; a No. 3 hydraulic cylinder (23) is fixedly connected to the side of the protrusions of the two panels (22) that are close to each other; the other end of the No. 3 hydraulic cylinder (23) is fixedly connected to the side wall of the cavity (19); and a conical clamping strip (24) is provided on the side of the slide plate (21) close to the middle of the placement box (18).

8. The electrolyte injection device for a lithium battery according to claim 7, characterized in that: A mounting block (25) is provided on one side of the slide plate (21); a plurality of slide cylinders (26) are fixedly connected to one side of the mounting block (25) close to the middle of the placement box (18); a plurality of through grooves (27) are provided around the outer ring of the slide cylinder (26); a first convex ring (28) is fixedly connected to the outer ring of one end of the slide cylinder (26) away from the mounting block (25); a slide rod (29) is slidably installed inside the slide cylinder (26); a second convex ring (30) is fixedly connected to the outer ring of the slide rod (29) close to the mounting block (25); the second convex ring (3 0) is sleeved on the outer ring of the slide (26); the inner ring of the No. 2 convex ring (30) is fixed with a plurality of protrusions, and the protrusions of the No. 2 convex ring (30) slide through the through groove (27); a spring (31) is provided between the No. 2 convex ring (30) and the No. 1 convex ring (28); the spring (31) is sleeved on the outer ring of the slide (26); one end of the plurality of slide rods (29) close to the middle of the placement box (18) is fixed with a mounting plate (32); the adjacent sides of the two mounting plates (32) are bolted to the conical clamping strip (24).

9. The electrolyte injection device for a lithium battery according to claim 8, characterized in that: A fixing groove (33) is provided in the middle of the slide plate (21); the mounting block (25) is fixedly mounted by a plurality of bolts passing through the fixing groove (33).

10. The electrolyte injection device for a lithium battery according to claim 7, characterized in that: The inner bottom surface of the placement box (18) is provided with a bottom edge clamping assembly, and the bottom edge clamping assembly is used to clamp the bottom edge of the shell (2); the bottom edge clamping assembly includes a plurality of pairs of No. 2 slide grooves (34) opened on both sides of the inner bottom surface of the placement box (18); a bidirectional screw rod (35) is rotatably installed inside the middle pair of No. 2 slide grooves (34); a slider (36) is slidably installed inside the No. 2 slide groove (34); the bidirectional screw rod (35) and the slider (36) are threadedly matched; A No. 2 motor (37) is fixedly connected to the middle bottom surface of the cavity (19); the outer ring of the rotating shaft of the No. 2 motor (37) and the middle outer ring of the bidirectional screw (35) are both fixedly connected to a No. 2 gear (38); the two No. 2 gears (38) are meshed with each other; the tops of the plurality of sliders (36) are fixedly connected to an arc-shaped bracket (39); the tops of the arc-shaped brackets (39) are bent toward the middle of the placement box (18); and the tops of the arc-shaped brackets (39) are fixedly connected to a rubber convex strip (40).

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