Lithium battery electrolyte filling device

Abstract

The utility model discloses a lithium battery electrolyte filling device which comprises an electrolyte box, supporting rods are fixedly connected to the four corners of the outer side end of the electrolyte box, four first connecting rods are fixedly connected to the bottom of the electrolyte box at equal intervals, and electric push rods are fixedly connected to the lower ends of the first connecting rods. A liquid injection mechanism is arranged below the middle of the electrolyte box and communicates with a connecting hose, a bottom plate is arranged below the liquid injection mechanism, a fixing mechanism is slidably connected to the upper surface of the bottom plate, fixing plates are fixedly connected to the left side and the right side of the lower end of the bottom plate, and a lead screw and a first guide column are installed between the fixing plates. And a first motor is mounted on the surface of the fixed plate. Through cooperation of a screw rod, a transmission chain, a large chain wheel and a small chain wheel in the electrolyte injection mechanism, a third motor can control the movement amount of a piston pushed by the screw rod, so that the amount of electrolyte pumped into an electrolyte injection cylinder is adjusted, and electrolyte injection of lithium batteries of different models is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and particularly relates to a device for filling electrolyte of a lithium battery. Background Art

[0002] A lithium battery is a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. The production of lithium batteries includes a pole piece manufacturing process, a battery assembly process, and finally a liquid injection, pre-charging, formation, and aging process. The basic process of liquid injection is to connect the battery liquid injection hole to a vacuum system, evacuate to form a negative pressure inside the battery case, and the electrolyte enters the battery through a liquid injection tube under the action of the negative pressure.

[0003] In the patent with the publication number "CN112736375B" and the patent name of a device for filling electrolyte in lithium battery production, it includes a first motor, a second motor, a pump, a controller, and a support plate. The left and right sides of the lower end of the support plate are fixedly connected with support plates and a plurality of electric telescopic rods. A clamping mechanism is arranged on the lower side of the support plate, and a moving support mechanism is arranged at the lower end of the support plate. The lower end of the electric telescopic rod is fixedly connected with a support plate, and the center of the support plate is fixedly connected with a liquid injection cylinder. A piston is slidably connected inside the liquid injection cylinder, the upper end of the piston is fixedly connected with a push rod, and a reciprocating mechanism is arranged above the push rod. The upper end of the support plate is fixedly connected with a connecting column, and the upper end of the connecting column is fixedly connected with a stirring tank. The first motor is arranged at the upper end of the stirring tank.

[0004] In the above device, when the piston in the liquid injection cylinder rises, a negative pressure is formed in the liquid injection cylinder. After sucking the electrolyte from the stirring tank into the liquid injection cylinder, by rotating the second motor to control any one of the rotating rods to rotate, the left and right rotating rods are driven by a synchronous belt to control the left and right third gears to rotate. The toothed areas of the left and right third gears will respectively engage with the left and right tooth rails of the push rod periodically, controlling the push rod to move up and down periodically to realize the pushing process of the electrolyte. However, the rising height of the piston is fixed under the influence of the third gear and the push rod, resulting in a fixed suction volume of the electrolyte by the liquid injection cylinder, so that the liquid injection cylinder can only inject the electrolyte into a lithium battery case with a fixed size once. Content of the Utility Model

[0005] The purpose of the utility model is to provide a device for filling electrolyte of a lithium battery, which can adjust the amount of electrolyte sucked by the liquid injection cylinder according to the size of the lithium battery that needs to be filled with electrolyte, so that the device can directly inject the electrolyte into lithium batteries of different sizes once respectively.

[0006] To achieve the above object, a lithium battery electrolyte filling device is provided, which includes an electrolyte tank. Four support rods are fixedly connected to the four corners of the outer side end of the electrolyte tank. Four first connecting rods are fixedly connected to the bottom of the electrolyte tank at equal intervals. An electric push rod is fixedly connected to the lower end of the first connecting rod. A liquid injection mechanism is arranged below the middle part of the electrolyte tank, and the lower end of the electric push rod is fixedly connected to the liquid injection mechanism. The liquid injection mechanism is communicated with a connecting hose, and the other end of the connecting hose is connected to the bottom of the electrolyte tank main body. A bottom plate is arranged below the liquid injection mechanism, and the lower end of the support rod is fixedly connected to the bottom plate. A fixing mechanism is slidably connected to the upper surface of the bottom plate. Two first sliding grooves are symmetrically formed on the surface of the bottom plate, and the fixing mechanism passes through the first sliding grooves and extends below the bottom plate. Fixing plates are fixedly connected to the left and right sides of the lower end of the bottom plate. A lead screw and a first guiding column are installed between the fixing plates. The lead screw is threadedly connected to the fixing mechanism, and the first guiding column is slidably connected to the fixing mechanism. A first motor is installed on the surface of the fixing plate, and the output end of the first motor is fixedly connected to the lead screw. Support legs are fixedly connected to the four corners of the lower end of the bottom plate respectively. It can adjust the amount of electrolyte inhaled by the liquid injection cylinder according to the size of the lithium battery that needs to be filled with electrolyte, so that the device can directly fill different-sized lithium batteries once respectively.

[0007] According to the described lithium battery electrolyte filling device, the liquid filling mechanism is composed of a connecting plate, a second connecting rod, a mounting plate, a liquid injection needle, a liquid injection cylinder, a screw rod and a piston. The connecting plate is fixedly connected to the lower end of the electric push rod. The second connecting rods are arranged at the four corners of the connecting plate and fixedly connected to the lower end of the connecting plate. The mounting plate is fixedly connected to the lower end of the second connecting rod. The liquid injection cylinder is fixedly connected to the upper end of the mounting plate. The screw rod is arranged in the middle of one end of the liquid injection cylinder and extends into the liquid injection cylinder and is threadedly connected to the liquid injection cylinder. The piston is arranged in the liquid injection cylinder and is slidably connected to the inner wall of the liquid injection cylinder. One end of the screw rod is rotatably connected to the middle of the piston. A support sleeve is fixedly connected to the middle of one end of the liquid injection cylinder, and the screw rod passes through the middle of the support sleeve. A large sprocket is rotatably connected to the outer end of the support sleeve, and the screw rod passes through the middle of the large sprocket and is fixedly connected to the large sprocket. Two third guide posts on the same side as the screw rod are symmetrically and fixedly connected to the surface of the piston, and the end of the third guide post away from the screw rod penetrates through the liquid injection cylinder and is slidably connected to the liquid injection cylinder. A first one-way valve is installed at the top of the end of the liquid injection cylinder away from the support sleeve. One end of the connecting hose is fixedly connected to the first one-way valve. A second one-way valve is installed at the lower end of the mounting plate, and the upper end of the second one-way valve passes through the mounting plate and communicates with the liquid injection cylinder. The second one-way valve and the first one-way valve are on the same side of the liquid injection cylinder. The liquid injection needle is fixedly connected to the lower end of the second one-way valve, and the liquid injection needle communicates with the liquid injection cylinder through the second one-way valve. A third motor is fixedly connected to the lower end of the connecting plate. The output end of the third motor is fixedly connected to a small sprocket. A transmission chain meshes with the outer sides of the large sprocket and the small sprocket, and the transmission chain is located between the two third guide posts. The third motor drives the small sprocket to rotate. The transmission of the transmission chain causes the small sprocket to drive the large sprocket to rotate. The large sprocket drives the screw rod to rotate. The threaded connection between the screw rod and the liquid injection cylinder converts the rotational motion into a linear motion and pushes the piston to move in the liquid injection cylinder, so that the piston cooperates with the liquid injection cylinder to suck the electrolyte in the electrolyte tank and then stably inject the electrolyte into the lithium battery housing. The first one-way valve and the second one-way valve enable the electrolyte in the connecting hose and the liquid injection needle to flow only in one direction.

[0008] According to the described lithium battery electrolyte filling device, the fixing mechanism consists of clamping plates, a second motor, adjusting blocks, an electric guide rail, a support platform, a support frame, a second guide post, and a bidirectional lead screw. The support platform is slidably connected to the upper end of the bottom plate, and the bottom of the support platform passes through the chute. The lead screw penetrates through the support platform and is threadedly connected to the support platform. The first guide post penetrates through the support platform and is slidably connected to the support platform. The support frame is slidably connected to the upper end of the support platform. The electric guide rail is installed in the support frame and is perpendicular to the first chute. The electric guide rail includes a slider, and the upper end of the slider of the electric guide rail is fixedly connected to the support frame. Two second chutes parallel to the electric guide rail are symmetrically formed on the upper surface of the support frame. The adjusting blocks are arranged in the support frame and pass through the second chutes upward, and two adjusting blocks in the second chutes are symmetrically provided. The clamping plates are slidably connected to the upper end of the support frame and are symmetrically provided in two. The lower ends of the clamping plates are fixedly connected to the adjusting blocks. The second guide post and the bidirectional lead screw are respectively arranged below the middle of the two second chutes, and the second guide post and the bidirectional lead screw are located inside the support frame and are rotatably connected to the support frame. The second motor is fixedly connected to the outer end of the support frame, and the output end of the second motor is fixedly connected to the bidirectional lead screw. The second guide post penetrates through the adjusting block and is slidably connected to the adjusting block. The bidirectional lead screw penetrates through the middle of the adjusting block and is threadedly connected to the adjusting block, and the two adjusting blocks in the second chutes are respectively located in the two thread directions of the bidirectional lead screw. The second motor controls the rotation of the bidirectional lead screw to enable the adjusting block to drive the clamping plate to fix the lithium battery shell. The electric guide rail enables the support frame to move on the support platform, and cooperates with the first motor to drive the lead screw to rotate to move the fixing mechanism, so that when the fixing mechanism fixes lithium battery shells of different sizes, the liquid injection port of the lithium battery shell can be moved directly below the liquid injection needle of the liquid injection mechanism.

[0009] According to the described lithium battery electrolyte filling device, a distance sensor is installed at one end of the liquid injection cylinder, and the distance sensor and the support sleeve are located at the same end. The distance sensor is used to detect the distance from the piston, so as to detect the amount of electrolyte sucked into the liquid injection cylinder.

[0010] According to the described lithium battery electrolyte filling device, two symmetric recognition cameras are installed at the lower end of the mounting plate, and the detection ends of the recognition cameras face downward below the liquid injection needle. The recognition cameras are used to detect whether the liquid injection port of the lithium battery shell has moved into place, ensuring that the liquid injection needle can extend into the lithium battery shell for liquid injection.

[0011] According to the described lithium battery electrolyte filling device, breathing holes are formed on the surface of the liquid injection cylinder, and the breathing holes are located at one end of the piston away from the first one-way valve and the second one-way valve. The breathing holes enable the space on the screw side in the liquid injection cylinder to communicate with the outside when the piston moves, ensuring the normal movement of the piston in the liquid injection cylinder.

[0012] According to the described lithium battery electrolyte filling device, a controller is fixedly connected to the surface of the support rod. The controller enables the staff to control the device to fix the lithium battery housing and fill it with electrolyte.

[0013] According to the described lithium battery electrolyte filling device, a solenoid valve for controlling the conduction of the connecting hose is installed at the bottom of the electrolyte tank. The solenoid valve controls the conduction at the bottom of the electrolyte tank, facilitating the disassembly of the connecting hose for maintenance.

[0014] The beneficial effects of the above solution are as follows: Through the cooperation of the screw, drive chain, large sprocket and small sprocket in the liquid injection mechanism, the third motor can control the moving amount of the screw to push the piston, thereby adjusting the amount of electrolyte drawn into the liquid injection cylinder. The second motor controls the rotation of the bidirectional lead screw, enabling the adjusting block to drive the clamping plate to fix the lithium battery housing. The electric guide rail moves the support frame on the support platform, and in cooperation with the first motor driving the lead screw to rotate to move the fixing mechanism, the lithium battery housing fixed by the clamping plate can move within the plane above the bottom plate, so that when the fixing mechanism fixes lithium battery housings of different sizes, the liquid injection port of the lithium battery housing can be moved directly below the liquid injection needle of the liquid injection mechanism, realizing the injection of electrolyte into lithium batteries of different models.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0017] Figure 1 is a perspective view of a lithium battery electrolyte filling device of the present utility model;

[0018] Figure 2 is a front view of a lithium battery electrolyte filling device of the present utility model;

[0019] Figure 3 is a perspective view of the cooperation between the fixing mechanism and the bottom plate of a lithium battery electrolyte filling device of the present utility model;

[0020] Figure 4 is a cross-sectional view of the fixing mechanism of a lithium battery electrolyte filling device of the present utility model;

[0021] Figure 5 is a perspective view of the liquid injection mechanism of a lithium battery electrolyte filling device of the present utility model;

[0022] Figure 6 is a cross-sectional view of the liquid injection mechanism of a lithium battery electrolyte filling device of the present utility model;

[0023] Figure 7 is Figure 6 an enlarged view of part A in

[0024] Figure 8 a sectional view showing the cooperation of a screw, a large sprocket and a support sleeve in a fixing mechanism of a lithium battery electrolyte filling device of the present utility model.

[0025] Legend:

[0026] 1. electrolyte tank; 2. support rod; 3. controller; 4. bottom plate; 5. support leg; 6. first motor; 7. fixing mechanism; 8. liquid injection mechanism; 9. connecting hose; 10. electric push rod; 11. first connecting rod; 12. lead screw; 13. fixing plate; 14. first guide post; 15. first chute; 16. clamping plate; 17. second motor; 18. adjusting block; 19. electric guide rail; 20. support platform; 21. support frame; 22. second guide post; 23. bidirectional lead screw; 24. second chute; 25. connecting plate; 26. second connecting rod; 27. mounting plate; 28. identification camera; 29. liquid injection needle; 30. liquid injection cylinder; 31. first one-way valve; 32. screw; 33. third guide post; 34. piston; 35. second one-way valve; 36. drive chain; 37. large sprocket; 38. support sleeve; 39. distance sensor; 40. third motor; 41. small sprocket. Detailed implementation manners

[0027] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model. Embodiment 1

[0028] Refer to Figures 1-8, in an embodiment of the present utility model, a device for filling a lithium battery electrolyte includes an electrolyte tank 1. Four support rods 2 are fixedly connected to the four corners of the outer side end of the electrolyte tank 1. Four first connecting rods 11 are fixedly connected to the bottom of the electrolyte tank 1 at equal intervals. An electric push rod 10 is fixedly connected to the lower end of the first connecting rod 11. The electric push rods 10 at the lower ends of the four first connecting rods 11 extend synchronously by sharing a servo motor. A liquid injection mechanism 8 is provided below the middle of the electrolyte tank 1, and the lower end of the electric push rod 10 is fixedly connected to the liquid injection mechanism 8. The liquid injection mechanism 8 is communicated with a connecting hose 9, and the other end of the connecting hose 9 is connected to the bottom of the main body of the electrolyte tank 1. A bottom plate 4 is provided below the liquid injection mechanism 8, and the lower ends of the support rods 2 are fixedly connected to the bottom plate 4. A fixing mechanism 7 is slidably connected to the upper surface of the bottom plate 4. Two first sliding grooves 15 are symmetrically formed on the surface of the bottom plate 4, and the fixing mechanism 7 passes through the first sliding grooves 15 and extends below the bottom plate 4. Fixing plates 13 are fixedly connected to the left and right sides of the lower end of the bottom plate 4. A lead screw 12 and a first guiding column 14 are installed between the fixing plates 13. The lead screw 12 is threadedly connected to the fixing mechanism 7, and the first guiding column 14 is slidably connected to the fixing mechanism 7. A first motor 6 is installed on the surface of the fixing plate 13, and the output end of the first motor 6 is fixedly connected to the lead screw 12. Support legs 5 are fixedly connected to the four corners of the lower end of the bottom plate 4. The fixing mechanism 7 fixes the lithium battery housing. The electric push rod 10 pushes the liquid injection mechanism 8 to move downward to inject liquid into the lithium battery housing. The first motor 6 drives the lead screw 12 to rotate, so that the fixing mechanism 7 drives the lithium battery housing to move in one direction on the surface of the bottom plate 4.

[0029] The liquid injection mechanism 8 is composed of a connecting plate 25, a second connecting rod 26, a mounting plate 27, a liquid injection needle 29, a liquid injection cylinder 30, a screw 32 and a piston 34. The connecting plate 25 is fixedly connected to the lower end of the electric push rod 10. The second connecting rod 26 is arranged at the four corners of the connecting plate 25 and fixedly connected to the lower end of the connecting plate 25. The mounting plate 27 is fixedly connected to the lower end of the second connecting rod 26. The liquid injection cylinder 30 is fixedly connected to the upper end of the mounting plate 27. The screw 32 is arranged at the middle of one end of the liquid injection cylinder 30, and the screw 32 extends into the liquid injection cylinder 30 and is threadedly connected to the liquid injection cylinder 30. The piston 34 is arranged in the liquid injection cylinder 30 and is slidably connected to the inner wall of the liquid injection cylinder 30. One end of the screw 32 is rotatably connected to the middle of the piston 34. A support sleeve 38 is fixedly connected to the middle of one end of the liquid injection cylinder 30, and the screw 32 passes through the middle of the support sleeve 38. A distance sensor 39 is installed at one end of the liquid injection cylinder 30, and the distance sensor 39 and the support sleeve 38 are located at the same end. The distance sensor 39 is used to detect the distance from the piston 34, so as to detect the amount of electrolyte sucked by the liquid injection cylinder 30. A large sprocket 37 is rotatably connected to the outer side end of the support sleeve 38, and the screw 32 passes through the middle of the large sprocket 37 and is fixedly connected to the large sprocket 37. Two third guide posts 33 on the same side as the screw 32 are symmetrically and fixedly connected to the surface of the piston 34, and the end of the third guide post 33 far from the screw 32 passes through the liquid injection cylinder 30 and is slidably connected to the liquid injection cylinder 30. A first one-way valve 31 is installed at the top of one end of the liquid injection cylinder 30 far from the support sleeve 38. One end of the connecting hose 9 is fixedly connected to the first one-way valve 31. The electrolyte in the connecting hose 9 can only flow in the direction of the liquid injection cylinder 30. A second one-way valve 35 is installed at the lower end of the mounting plate 27, and the upper end of the second one-way valve 35 passes through the mounting plate 27 and is communicated with the liquid injection cylinder 30. The liquid in the liquid injection cylinder 30 can only be discharged through the second one-way valve 35 and then through the liquid injection needle 29. The second one-way valve 35 and the first one-way valve 31 are located on the same side of the liquid injection cylinder 30. The liquid injection needle 29 is fixedly connected to the lower end of the second one-way valve 35, and the liquid injection needle 29 is communicated with the liquid injection cylinder 30 through the second one-way valve 35. A third motor 40 is fixedly connected to the lower end of the connecting plate 25. The output end of the third motor 40 is fixedly connected to a small sprocket 41. A transmission chain 36 is meshed with the outer sides of the large sprocket 37 and the small sprocket 41, and the transmission chain 36 is located between the two third guide posts 33. Two symmetric identification cameras 28 are installed at the lower end of the mounting plate 27, and the detection ends of the identification cameras 28 face the lower part of the liquid injection needle 29. The identification cameras 28 are used to detect whether the liquid injection port of the lithium battery housing has moved into place, so as to ensure that the liquid injection needle 29 can extend into the lithium battery housing for liquid injection. A breathing hole is opened on the surface of the liquid injection cylinder 30, and the breathing hole is located at the end of the piston 34 far from the first one-way valve 31 and the second one-way valve 35. The breathing hole enables the space on the side of the screw 32 in the liquid injection cylinder 30 to communicate with the outside when the piston 34 moves, ensuring the normal movement of the piston 34 in the liquid injection cylinder 30. An electromagnetic valve for controlling the conduction of the connecting hose 9 is installed at the bottom of the electrolyte tank 1. The electromagnetic valve controls the conduction at the bottom of the electrolyte tank 1.It is convenient to disassemble the connecting hose 9 for maintenance and repair.

[0030] A controller 3 is fixedly connected to the surface of the support rod 2. The controller 3 enables the staff to set the moving amount of the piston 34 in the liquid injection cylinder 30, and controls the third motor 40 to stop working after the piston 34 reaches the position by combining the distance change of the piston 34 detected by the distance sensor 39. The controller 3 controls the second motor 17 to work so that the clamping plate 16 clamps the lithium battery case, and the controller 3 controls the first motor 6, the electric guide rail 19 and the second motor 17 by combining the data detected by the recognition camera 28, and transmits to the controller 3 to enable the staff to control the device to fix the lithium battery shell and add electrolyte. Embodiment 2

[0031] Refer to Figures 1-4, the difference between this embodiment and the above-mentioned first embodiment is that the fixing mechanism 7 consists of a clamping plate 16, a second motor 17, an adjusting block 18, an electric guide rail 19, a support platform 20, a support frame 21, a second guide post 22 and a bidirectional lead screw 23. The support platform 20 is slidably connected to the upper end of the bottom plate 4, and the bottom of the support platform 20 passes through the chute. The lead screw 12 passes through the support platform 20 and is threadedly connected to the support platform 20. The first guide post 14 passes through the support platform 20 and is slidably connected to the support platform 20. The support frame 21 is slidably connected to the upper end of the support platform 20. The electric guide rail 19 is installed in the support frame 21 and is perpendicular to the first chute 15. The electric guide rail 19 includes a slider, and the upper end of the slider of the electric guide rail 19 is fixedly connected to the support frame 21. Two second chutes 24 parallel to the electric guide rail 19 are symmetrically formed on the upper surface of the support frame 21. The adjusting block 18 is arranged in the support frame 21 and passes upward through the second chute 24, and two adjusting blocks 18 in the second chute 24 are symmetrically arranged. The clamping plate 16 is slidably connected to the upper end of the support frame 21 and two clamping plates 16 are symmetrically arranged, and the lower end of the clamping plate 16 is fixedly connected to the adjusting block 18. The second guide post 22 and the bidirectional lead screw 23 are respectively arranged below the middle parts of the two second chutes 24, and the second guide post 22 and the bidirectional lead screw 23 are located inside the support frame 21 and are rotatably connected to the support frame 21. The second motor 17 is fixedly connected to the outer end of the support frame 21, and the output end of the second motor 17 is fixedly connected to the bidirectional lead screw 12. The second guide post 22 passes through the adjusting block 18 and is slidably connected to the adjusting block 18. The bidirectional lead screw 23 passes through the middle part of the adjusting block 18 and is threadedly connected to the adjusting block 18, and the two adjusting blocks 18 in the second chute 24 are respectively located on the two thread directions of the bidirectional lead screw 12. The second motor 17 controls the rotation of the bidirectional lead screw 23, so that the adjusting block 18 drives the clamping plate 16 to fix the lithium battery shell. The electric guide rail 19 moves the support frame 21 on the support platform 20, and cooperates with the first motor 6 to drive the lead screw 12 to rotate to move the fixing mechanism 7, so that when the fixing mechanism 7 fixes lithium battery shells of different sizes, the liquid injection port of the lithium battery shell can be moved directly below the liquid injection needle 29 of the liquid injection mechanism 8.

[0032] Working principle: When in use, place the lithium battery housing on the support frame 21 between the two clamping plates 16. The second motor 17 drives the bidirectional lead screw 23 to rotate, causing the adjusting block 18 to drive the clamping plates 16 to clamp the lithium battery housing. The first motor 6 drives the lead screw 12 to rotate, causing the fixing mechanism 7 and the lithium battery housing to move in one direction. The electric guide rail 19 drives the support frame 21 and the lithium battery body to move on the fixing mechanism 7 in a direction perpendicular to the moving direction of the fixing mechanism 7. The recognition camera 28 detects the liquid injection port of the lithium battery housing until the liquid injection port of the lithium battery housing is directly below the liquid injection needle 29 of the liquid injection mechanism 8. The electric push rod 10 pushes the liquid injection mechanism 8 downward, causing the liquid injection needle 29 to enter the liquid injection port of the lithium battery housing. The third motor 40 drives the small sprocket 41 to rotate. The transmission of the transmission chain 36 causes the small sprocket 41 to drive the large sprocket 37 to rotate. The large sprocket 37 drives the screw 32 to rotate, causing the screw 32 to push the piston 34 to move in the liquid injection cylinder 30 away from the first one-way valve 31 and the second one-way valve 35, sucking the electrolyte in the electrolyte tank 1 into the liquid injection cylinder 30 through the connecting hose 9 and the first one-way valve 31. Then, the third motor 40 causes the small sprocket 41 to rotate. After the transmission of the transmission chain 36, the large sprocket 37 drives the screw 32 to rotate in the reverse direction. The piston 34 gradually resets and pushes the electrolyte in the liquid injection cylinder 30 to be stably injected into the lithium battery housing through the second one-way valve 35 and the liquid injection needle 29.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field to which it belongs, various changes can be made without departing from the gist of the present invention.

Claims

1. A lithium battery electrolyte filling device, comprising: An electrolyte tank (1) is characterized in that the four corners of the outer end of the electrolyte tank (1) are fixedly connected to support rods (2), the bottom of the electrolyte tank (1) is equidistantly fixedly connected to four first connecting rods (11), the lower ends of the first connecting rods (11) are fixedly connected to an electric push rod (10), a liquid injection mechanism (8) is provided below the middle of the electrolyte tank (1), and the lower end of the electric push rod (10) is fixedly connected to the liquid injection mechanism (8), the liquid injection mechanism (8) is connected to a connecting hose (9), and the other end of the connecting hose (9) is connected to the bottom of the electrolyte tank (1) body, a bottom plate (4) is provided below the liquid injection mechanism (8), the lower ends of the support rods (2) are fixedly connected to the bottom plate (4), and the upper end of the bottom plate (4) is fixedly connected to the bottom plate (4). The surface is slidably connected with a fixing mechanism (7); two first sliding grooves (15) are symmetrically provided on the surface of the base plate (4); the fixing mechanism (7) passes through the first sliding grooves (15) and extends to the bottom of the base plate (4); the left and right sides of the lower end of the base plate (4) are fixedly connected with fixing plates (13); a lead screw (12) and a first guide column (14) are installed between the fixing plates (13); the lead screw (12) is threadedly connected to the fixing mechanism (7); the first guide column (14) is slidably connected to the fixing mechanism (7); a first motor (6) is installed on the surface of the fixing plate (13); the output end of the first motor (6) is fixedly connected to the lead screw (12); and the four corners of the lower end of the base plate (4) are respectively fixedly connected with support legs (5).

2. A lithium battery electrolyte filling device according to claim 1, characterized in that: The injection mechanism (8) is composed of a connecting plate (25), a second connecting rod (26), a mounting plate (27), an injection needle (29), an injection cylinder (30), a screw (32) and a piston (34); the connecting plate (25) is fixedly connected to the lower end of the electric push rod (10); the second connecting rod (26) is arranged at four corners of the connecting plate (25) and is fixedly connected to the lower end of the connecting plate (25); the mounting plate (27) is fixedly connected to the lower end of the second connecting rod (26); the injection cylinder (30) is fixedly connected to the upper end of the mounting plate (27); the screw (32) is arranged at one end of the injection cylinder (30) and is fixedly connected to the upper end of the mounting plate (27); The middle part of the end of the liquid injection cylinder (30) is fixedly connected with a support sleeve (38), and the screw (32) extends into the liquid injection cylinder (30) and is threadedly connected to the liquid injection cylinder (30). The piston (34) is arranged in the liquid injection cylinder (30) and is slidably connected to the inner wall of the liquid injection cylinder (30). One end of the screw (32) is rotatably connected to the middle part of the piston (34). The middle part of one end of the liquid injection cylinder (30) is fixedly connected with a support sleeve (38), and the screw (32) passes through the middle part of the support sleeve (38). The outer end of the support sleeve (38) is rotatably connected with a large sprocket (37), and the screw (32) passes through the middle part of the large sprocket (37) and is fixedly connected to the large sprocket (37). The surface of the plug (34) is symmetrically fixedly connected with two third guide pillars (33) on the same side as the screw rod (32), and the end of the third guide pillar (33) away from the screw rod (32) passes through the injection cylinder (30) and is slidably connected to the injection cylinder (30), and the top of the end of the injection cylinder (30) away from the support sleeve (38) is installed with a first one-way valve (31), one end of the connecting hose (9) is fixedly connected to the first one-way valve (31), and the lower end of the mounting plate (27) is installed with a second one-way valve (35), and the upper end of the second one-way valve (35) passes through the mounting plate (27) and is connected to the injection cylinder (30). The second one-way valve (35) and the first one-way valve (31) are located on the same side of the injection cylinder (30), the injection needle (29) is fixedly connected to the lower end of the second one-way valve (35), and the injection needle (29) is connected to the injection cylinder (30) through the second one-way valve (35), the lower end of the connecting plate (25) is fixedly connected to a third motor (40), the output end of the third motor (40) is fixedly connected to a small sprocket (41), the outer sides of the large sprocket (37) and the small sprocket (41) are meshed with a transmission chain (36), and the transmission chain (36) is located between the two third guide pillars (33).

3. A lithium battery electrolyte filling device according to claim 2, characterized in that: The fixing mechanism (7) comprises a clamping plate (16), a second motor (17), an adjusting block (18), an electric guide rail (19), a support platform (20), a support frame (21), a second guide column (22) and a bidirectional screw rod (23); the support platform (20) is slidably connected to the upper end of the base plate (4), and the bottom of the support platform (20) passes through the slide groove; the screw rod (12) passes through the support platform (20) and is threadedly connected to the support platform (20); the first guide column (14) passes through the support platform (20) and is The support frame (21) is slidably connected to the upper end of the support platform (20), the electric guide rail (19) is installed in the support frame (21), and the electric guide rail (19) and the first slide groove (15) are perpendicular to each other, the electric guide rail (19) includes a slider, and the upper end of the slider of the electric guide rail (19) is fixedly connected to the support frame (21), the upper surface of the support frame (21) is symmetrically provided with two second slide grooves (24) parallel to the electric guide rail (19), and the adjustment block (18 ) is arranged in the support frame (21) and passes through the second slide groove (24) upward, and the second slide groove (24) has two symmetrical adjustment blocks (18), the clamping plate (16) is slidably connected to the upper end of the support frame (21) and has two symmetrical adjustment blocks, and the lower end of the clamping plate (16) is fixedly connected to the adjustment block (18), the second guide column (22) and the bidirectional screw rod (23) are respectively arranged below the middle of the two second slide grooves (24), and the second guide column (22) and the bidirectional screw rod (23) are located in the support frame (21) and are connected to the support frame (21). The support frame (21) is rotatably connected, the second motor (17) is fixedly connected to the outer end of the support frame (21), and the output end of the second motor (17) is fixedly connected to the bidirectional lead screw (12), the second guide column (22) passes through the adjustment block (18) and is slidably connected to the adjustment block (18), the bidirectional lead screw (23) passes through the middle of the adjustment block (18) and is threadedly connected to the adjustment block (18), and the two adjustment blocks (18) in the second slide groove (24) are respectively located in two thread directions of the bidirectional lead screw (12).

4. A lithium battery electrolyte filling device according to claim 2, characterized in that: A distance sensor (39) is installed at one end of the liquid injection cylinder (30), and a detection end of the distance sensor (39) extends into the liquid injection cylinder (30).

5. A lithium battery electrolyte filling device according to claim 2, characterized in that: Two symmetrical identification cameras (28) are installed at the lower end of the installation plate (27), and the detection ends of the identification cameras (28) face downwardly of the injection needle (29).

6. A lithium battery electrolyte filling device according to claim 2, characterized in that: A breathing hole is provided on the surface of the injection cylinder (30), and the breathing hole is located at an end of the piston (34) away from the first one-way valve (31) and the second one-way valve (35).

7. A lithium battery electrolyte filling device according to claim 1, characterized in that: A controller (3) is fixedly connected to the surface of the support rod (2).

8. A lithium battery electrolyte filling device according to claim 1, characterized in that: A solenoid valve for controlling the conduction of the connecting hose (9) is installed at the bottom of the electrolyte tank (1).

Images