Electrolyte injection device for lithium battery production

Abstract

The utility model relates to the technical field of lithium battery production, in particular to an electrolyte injection device for lithium battery production, which comprises a supporting seat, a driving motor arranged above the supporting seat, a reciprocating mechanism arranged at the output end of the driving motor and comprising a rotating shaft fixedly mounted on the output shaft of the driving motor, and a cam sleeved on the surface of the rotating shaft. A connecting shaft is arranged below the cam, the surface of the connecting shaft is sleeved with a spring, the spring is fixedly installed on the upper surface of the connecting plug body, the end, away from the cam, of the connecting shaft is fixedly connected with a piston, and a storage box is arranged above the supporting base and communicates with the connecting plug body; the driving motor drives the cam to rotate and pushes the piston to slide in the cavity, so that the liquid injection amount is accurately controlled, when the cam rotates to the position where the cam is not in contact with the connecting shaft, the spring restores, the piston and the connecting shaft are pushed to move upwards and return to the initial position, and it is guaranteed that the liquid injection amount is the same every time; and the consistency and the quality stability of the lithium battery are ensured.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, specifically to an electrolyte injection device for lithium battery production. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloys as the positive / negative electrode materials and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use require very strict environmental control. With the development of science and technology, lithium-ion batteries have become mainstream. Lithium-ion batteries can be broadly classified into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable.

[0003] The electrolyte is an important component of lithium-ion batteries. Inside the battery, it acts as a conductor for ions between the positive and negative electrodes and serves as a medium for lithium-ion migration and charge transfer. The performance of the electrolyte directly affects key indicators of the battery, such as voltage, energy density, and cycle performance. Therefore, the electrolyte injection process is crucial in the production of lithium batteries.

[0004] A search revealed that Chinese patent CN 213782215 U discloses a quantitative electrolyte injection device for lithium battery production. The device uses a first motor to drive a drive wheel to rotate, which in turn drives a driven wheel and a rotating plate to rotate. When the rotating plate rotates from a vertical position to a horizontal position, the material inside the electrolyte storage tank is blocked from entering the battery casing at the bottom, thus achieving a quantitative electrolyte injection operation.

[0005] In actual use, when the rotating plate is in a horizontal position to complete the liquid injection work, electrolyte will remain on the side of the rotating plate away from the liquid injection pipe during the process of rotating the plate to the horizontal position. The remaining electrolyte will drip onto the surface of the battery casing due to gravity, resulting in waste of electrolyte and contamination of the battery casing. Utility Model Content

[0006] The purpose of this invention is to provide an electrolyte injection device for lithium battery production. A drive motor rotates a cam, which in turn pushes a piston to slide within a cavity, thereby precisely controlling the injection volume. When the cam rotates to the position of the non-contact connecting shaft, the spring returns to its original state, pushing the piston and connecting shaft upwards and back to the initial position, ensuring that the injection volume is consistent each time. This also effectively solves the problem in existing technologies where residual electrolyte drips onto the battery casing surface during injection, leading to electrolyte waste and battery casing contamination, thus ensuring the stability of lithium battery electrolyte injection.

[0007] The present invention adopts the following technical solution:

[0008] An electrolyte injection device for lithium battery production includes a support base, a drive motor mounted above the support base, a reciprocating mechanism mounted at the output end of the drive motor, a rotating shaft fixedly mounted on the output shaft of the drive motor, a cam sleeved on the surface of the rotating shaft, a connecting shaft mounted below the cam, a spring sleeved on the surface of the connecting shaft, the spring fixedly mounted on the upper surface of a connecting plug body, a piston fixedly connected to the end of the connecting shaft away from the cam, a storage tank mounted above the support base, the storage tank communicating with the connecting plug body, and the connecting plug body communicating with an injection nozzle.

[0009] The end of the rotating shaft away from the drive motor is rotatably mounted on the connecting plug body, the connecting plug body is fixedly mounted on the support frame, and the support frame is fixedly mounted on the upper surface of the support base.

[0010] Furthermore, a limiting plate is provided above the connecting shaft, and the limiting plate is fixedly installed on the connecting plug body.

[0011] Furthermore, a cavity is provided inside the connecting plug body, and a piston is slidably connected to the cavity.

[0012] Furthermore, the end of the piston near the storage tank is connected to a feed pipe, which is connected to the storage tank, and a first rotating block is rotatably installed inside the feed pipe; the end of the piston away from the storage tank is connected to a discharge pipe, which is connected to a liquid injection nozzle.

[0013] Furthermore, a second rotating block is rotatably installed inside the discharge pipe, and the injection nozzle passes through the support frame and is slidably connected to the support frame.

[0014] Furthermore, the lower end of the support base is provided with multiple sets of support legs, and a conveyor belt is rotatably mounted on the upper surface of the support base.

[0015] The beneficial effects of this utility model are:

[0016] 1. By driving the cam to rotate through the drive motor, the piston slides in the cavity, thereby precisely controlling the amount of electrolyte injected. When the cam rotates to the position of the non-contact connecting shaft, the spring returns to its original state, pushing the piston and the connecting shaft to move upward and return to the initial position, ensuring that the amount of electrolyte injected each time is the same. At the same time, it can effectively solve the problem of residual electrolyte dripping onto the surface of the battery casing during the electrolyte injection process in the existing technology, which leads to electrolyte waste and battery casing contamination, thus ensuring the quality stability of lithium batteries.

[0017] 2. By replacing different models of cams or adjusting the distance between the limit plate and the connecting shaft, it can flexibly adapt to the liquid injection of lithium batteries of different sizes, which not only improves the versatility of the device, but also ensures the accuracy and stability of liquid injection, and meets the production needs of lithium batteries of different specifications.

[0018] 3. The set conveyor belt can automatically transport the lithium batteries to be injected to the injection nozzle, realizing the automation of injection operation. This not only significantly improves production efficiency, but also reduces the tediousness and labor intensity of manual handling, lowers production costs, and ensures the continuity and stability of injection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0021] Figure 2 This is a schematic diagram of the reciprocating mechanism in this utility model;

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 This is a schematic diagram of the piston structure in this utility model;

[0024] Figure 5 This is a schematic diagram of the feed pipe structure in this utility model;

[0025] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0026] Figure 7 A schematic diagram of the discharge pipe in this utility model;

[0027] Figure 8 for Figure 7 A magnified structural diagram at point C.

[0028] Reference numerals: 1. Support base; 2. Support leg; 3. Conveyor belt; 5. Injection nozzle; 6. Drive motor; 7. Rotating shaft; 8. Cam; 9. Limiting plate; 10. Connecting shaft; 11. Spring; 12. Connecting plug body; 13. Cavity; 15. Storage box; 16. First rotating block; 17. Feed pipe; 18. Second rotating block; 19. Discharge pipe; 21. Support frame; 22. Piston. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] An electrolyte injection device for lithium battery production, as shown in the attached document. Figures 1-8 The system includes a support base 1, a drive motor 6 mounted above the support base 1, a reciprocating mechanism at the output end of the drive motor 6, a rotating shaft 7 fixedly mounted on the output shaft of the drive motor 6, a cam 8 sleeved on the surface of the rotating shaft 7, a connecting shaft 10 below the cam 8, a spring 11 sleeved on the surface of the connecting shaft 10, the spring 11 fixedly mounted on the upper surface of the connecting plug body 12, a piston 22 fixedly connected to the end of the connecting shaft 10 away from the cam 8, a storage box 15 mounted above the support base 1, the storage box 15 communicating with the connecting plug body 12, the connecting plug body 12 communicating with the injection nozzle 5, the end of the rotating shaft 7 away from the drive motor 6 rotatably mounted on the connecting plug body 12, the connecting plug body 12 fixedly mounted on a support frame 21, the support frame 21 fixedly mounted on the upper surface of the support base 1, a limit plate 9 mounted above the connecting shaft 10, the limit plate 9 fixedly mounted on the connecting plug body 12, and the connecting plug body 12... The device has a cavity 13, with a piston 22 slidably connected to it. When the drive motor 6 is in the open state, it drives the rotating shaft 7 to rotate via the output shaft. The rotating shaft 7 drives the cam 8 to rotate synchronously. By changing the cam 8 to different models according to the size of the lithium battery mold, it is possible to inject electrolyte into lithium batteries of different sizes, thereby increasing the flexibility of the device. When the protruding end of the cam 8 contacts the top of the connecting shaft 10 and squeezes the connecting shaft, the spring 11 begins to compress and deform. At the same time, the connecting shaft 10 drives the piston 22 to slide downward on the inner wall of the connecting plug body 12, thereby reducing the space inside the cavity 13. The airflow inside the cavity 13 allows the electrolyte to flow smoothly from the injection nozzle 5 and accurately enter the lithium battery. In addition, by adjusting the distance between the lower end of the limiting plate 9 and the top end of the connecting shaft 10 according to the size of the lithium battery mold, it is possible to accurately inject electrolyte into lithium batteries of different sizes, thereby further increasing the flexibility of the device.

[0032] In the above technical solution, the end of piston 22 near storage tank 15 is connected to feed pipe 17, feed pipe 17 is connected to storage tank 15, and a first rotating block 16 is rotatably installed inside feed pipe 17. The end of piston 22 away from storage tank 15 is connected to discharge pipe 19, discharge pipe 19 is connected to injection nozzle 5, and a second rotating block 18 is rotatably installed inside discharge pipe 19. Injection nozzle 5 passes through support frame 21 and is slidably connected to support frame 21. When the airflow inside the cavity squeezes discharge pipe 19, the second rotating block 18 inside discharge pipe 19... 8 rotates towards the injection nozzle 5, thus maintaining communication between the feed tube 19 and the injection nozzle. Simultaneously, the first rotating plate 16 inside the feed tube 17 rotates towards the cavity 13, maintaining communication between the feed tube 17 and the cavity 13. When the protruding end of the cam 8 moves away from the connecting shaft 10, the spring 11 returns to its original state, driving the connecting shaft 10 upwards. The top end of the connecting shaft 10 finally contacts the lower end of the limiting plate 9, which then limits its movement, ensuring that the injection volume is consistent each time.

[0033] In addition, the lower end of the support base 1 is equipped with multiple sets of support legs 2, and a conveyor belt 3 is rotatably mounted on the upper surface of the support base 1. The support legs 2 are used to provide stable support, ensuring that the entire liquid injection device can be placed stably in the working area, avoiding shaking or tilting during operation, which would affect the accuracy and safety of liquid injection. The conveyor belt 3 transports the lithium batteries to be injected in an orderly manner to the area directly below the liquid injection nozzle 5, so that the liquid injection nozzle 5 can be accurately aligned with the liquid injection port of the lithium battery for liquid injection operation. This improves production efficiency to a certain extent, reduces the tediousness and labor intensity of manual handling, and also ensures the continuity and stability of liquid injection.

[0034] The working principle of this utility model:

[0035] In use, the drive motor 6 drives the rotating shaft 7 to rotate, which in turn drives the cam 8 to rotate. The rotation of the cam 8 pushes the connecting shaft 10 and the spring 11 downward to compress, so that the piston 22 slides in the cavity 13 of the connecting plug body 12, reducing the cavity volume. This allows the electrolyte to be drawn into the storage tank 15 through the feed pipe 17, and then accurately injected into the lithium battery located on the conveyor belt 3 through the discharge pipe 19 and the injection nozzle 5. When the cam 8 rotates to the position of not contacting the connecting shaft 10, the spring 11 returns to its original state, pushing the piston 22 and the connecting shaft 10 upward until the connecting shaft 10 is limited by the limiting plate 9, completing one injection cycle. At the same time, by adjusting the model of the cam 8 or the distance between the limiting plate 9 and the connecting shaft 10, it can be adapted to inject electrolyte into lithium batteries of different sizes.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electrolyte injection device for lithium battery production, comprising a support seat (1), characterized in that, The support seat (1) is provided with a driving motor (6) above, the output end of the driving motor (6) is provided with a reciprocating mechanism, the reciprocating mechanism comprises a rotating shaft (7) fixedly installed on the output shaft of the driving motor (6), the rotating shaft (7) is sleeved with a cam (8) on the surface, the cam (8) is provided with a connecting shaft (10) below, the connecting shaft (10) is sleeved with a spring (11) on the surface, the spring (11) is fixedly installed on the upper surface of the connecting plug body (12), the connecting shaft (10) is fixedly connected with a piston (22) at one end away from the cam (8), the support seat (1) is provided with a storage box (15) above, the storage box (15) is communicated with the connecting plug body (12), the connecting plug body (12) is communicated with a liquid injection nozzle (5). The rotating shaft (7) is rotatably installed at one end away from the driving motor (6) on the connecting plug body (12), the connecting plug body (12) is fixedly installed on the support frame (21), and the support frame (21) is fixedly installed on the upper surface of the support seat (1).

2. The electrolyte injection device for lithium battery production according to claim 1, characterized in that, The connecting shaft (10) is provided with a limiting plate (9) above, and the limiting plate (9) is fixedly installed on the connecting plug body (12).

3. The electrolyte injection device for lithium battery production according to claim 1, characterized in that, The connecting plug body (12) is internally provided with a cavity (13), and the cavity (13) is slidably connected with the piston (22).

4. The electrolyte injection device for lithium battery production of claim 1, wherein The piston (22) is communicated with a feeding pipe (17) at one end close to the storage box (15), the feeding pipe (17) is communicated with the storage box (15), and the feeding pipe (17) is rotatably installed with a first rotating block (16) inside; the piston (22) is communicated with a discharging pipe (19) at one end away from the storage box (15), and the discharging pipe (19) is communicated with the liquid injection nozzle (5).

5. The electrolyte injection device for lithium battery production according to claim 4, characterized in that, The discharging pipe (19) is rotatably installed with a second rotating block (18) inside, and the liquid injection nozzle (5) penetrates through the support frame (21) and is slidably connected with the support frame (21).

6. The electrolyte injection device for lithium battery production of claim 1, wherein, The lower end of the support seat (1) is provided with a plurality of support legs (2), and the upper surface of the support seat (1) is rotatably installed with a conveyor belt (3).

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