Cylindrical battery liquid injection device

Abstract

The invention discloses a cylindrical battery liquid injection device which comprises a liquid injection assembly, and the liquid injection assembly comprises a liquid injection cup assembly; the liquid injection cup assembly comprises a liquid injection cavity and a liquid inlet cavity, a liquid injection cup is formed between the liquid injection cavity and the liquid inlet cavity, a liquid injection nozzle is formed in the bottom of the liquid injection cup, and a second lifting plug rod is arranged at the liquid injection nozzle in a matched mode; a liquid injection groove is formed in the bottom of the liquid injection cavity, a sealing rubber plug matched with the second lifting blocking rod is installed on the inner side of the liquid injection groove, and a liquid injection needle is formed at the bottom end of the liquid injection groove. A liquid inlet is formed in the liquid inlet cavity and communicates with a liquid inlet channel. When liquid is communicated with the liquid inlet, the liquid can enter the liquid inlet cavity, and when the second lifting blocking rod is far away from the sealing rubber plug, the liquid can enter the liquid injection needle. The liquid injection device has the beneficial effects that the servo motor is adopted to drive all execution elements to operate in a coordinated mode, and liquid injection operation is completed; and the design is flexible, the structure is compact, and corresponding liquid injection retainer cups can be replaced according to the sizes of different products, so that the battery models in a wide size range are realized.

Description

Technical Field

[0001] The invention relates to the technical field of battery liquid injection, and in particular to a cylindrical battery liquid injection device. Background Art

[0002] As an electrochemical energy storage device with high energy density and long cycle life, lithium batteries are widely used in electronic products, electric vehicles, energy storage equipment, etc. In recent years, with the rise of renewable energy and electric vehicles, the demand for lithium batteries has surged, driving the continuous upgrading of its manufacturing process.

[0003] In the lithium battery manufacturing process, the injection step is crucial. The quality of injection directly affects the capacity, cycle life and safety of the battery. In order to meet the market demand for high-performance batteries, modern lithium battery production has gradually adopted a fully automatic injection system to improve production efficiency and reduce human errors. However, most of the cylindrical lithium battery injection equipment on the market currently uses an assembly line injection method, which has the problem of a narrow range of applicable product sizes, resulting in high equipment adjustment costs and long changeover time when producing batteries of different specifications. In addition, this type of injection equipment is usually bulky and difficult to maintain, which further affects the overall production efficiency and reliability of the equipment. Due to these limitations, the injection efficiency of existing injection equipment is low, and it cannot adapt well to the rapidly changing market demands and meet the production needs of products with diversified specifications. Summary of the invention

[0004] 1. Problems to be solved

[0005] The technical problem to be solved by the present invention is to provide a cylindrical battery liquid injection device in view of the current status of the prior art.

[0006] (II) Technical solution

[0007] The present invention is implemented through the following technical scheme: The present invention proposes a cylindrical battery liquid injection device, including a liquid injection assembly, and the liquid injection assembly includes a liquid injection cup assembly. The liquid injection cup assembly includes a liquid injection cavity and a liquid inlet cavity, a liquid injection cup is formed between the liquid injection cavity and the liquid inlet cavity, a liquid injection nozzle is formed at the bottom of the liquid injection cup, and a second lifting blocking rod is arranged at the liquid injection nozzle. A liquid injection groove is formed at the bottom of the liquid injection cavity, a sealing rubber plug that matches the second lifting blocking rod is installed on the inner side of the liquid injection groove, and a liquid injection needle is formed at the bottom of the liquid injection groove. A liquid inlet is formed in the liquid inlet cavity, and the liquid inlet is connected to a liquid inlet channel. When the liquid is connected to the liquid inlet, the liquid can enter the liquid inlet cavity, and when the second lifting blocking rod is away from the sealing rubber plug, the liquid can enter the liquid injection needle.

[0008] Furthermore, the liquid injection assembly also includes a blocking rod lifting plate, a lifting cylinder, a liquid injection base plate and an air circuit plate, and a sealing cover plate is fixed on the upper end of the liquid inlet cavity. The liquid inlet channel passes through the sealing cover plate and is connected to the liquid inlet, the second lifting blocking rod passes through the sealing cover plate and is connected to the lifting drive member, and the lifting drive member is fixedly connected to the blocking rod lifting plate; the lifting cylinder is installed on the blocking rod lifting plate.

[0009] Furthermore, the liquid inlet cavity is fixedly mounted on a liquid injection base plate, the liquid injection base plate is fixedly connected to an air circuit plate and an injection cup sleeve arranged outside the liquid injection cavity, and the air circuit plate includes a sealing cover plate and is connected to an air circuit pipe.

[0010] Furthermore, the liquid injection assembly is fixed on the frame, and the frame is sequentially arranged from top to bottom with a liquid injection port blocking rod lifting assembly, a liquid injection valve moving assembly, a liquid injection assembly, and a waste liquid collection assembly.

[0011] Furthermore, a liquid injection port blocking rod lifting assembly is correspondingly arranged on the top of the liquid injection assembly; the liquid injection port blocking rod lifting assembly includes a blocking rod mounting plate and a blocking rod driving mechanism for controlling the lifting and lowering movement of the liquid injection port blocking rod lifting assembly. The blocking rod mounting plate is installed with a first lifting blocking rod, and when the blocking rod driving mechanism drives the blocking rod mounting plate to move downward, the first lifting blocking rod is embedded in and blocks the liquid inlet channel.

[0012] Furthermore, the blocking rod driving mechanism includes a blocking rod mounting plate guide assembly, an electric cylinder, a servo motor 1, and a reducer 1 connected and installed with the servo motor 1. The mounting plate guide assembly includes a guide column and a linear bearing.

[0013] Furthermore, a waste liquid collecting component is correspondingly arranged below the liquid injection component, and the waste liquid collecting component includes a waste liquid collecting box and a waste liquid box driving mechanism.

[0014] Furthermore, the waste liquid box driving mechanism is used to drive the waste liquid collection box to move horizontally to receive the liquid dripped from the liquid injection cup assembly after the liquid injection is completed. The waste liquid box driving mechanism includes a slider adapter plate connected and fixed to both ends of the waste liquid collection box, the slider adapter plate is fixedly connected to the first synchronous belt and the slider 1, the slider 1 is slidably connected to the first linear guide rail; the first synchronous belt is equipped with a first synchronous wheel, the first synchronous wheel is connected to the first synchronous shaft; the first synchronous shaft is connected and equipped with a servo motor 2 and a reducer 2.

[0015] Furthermore, a liquid injection valve moving assembly is provided at the upper end of the liquid injection assembly. The liquid injection valve moving assembly includes a liquid adding mechanism and a liquid injection valve driving mechanism, and the liquid adding mechanism includes a mounting horizontal plate, and the mounting horizontal plate is mounted and connected with a slider adapter, a mounting vertical plate and a liquid adding cylinder for controlling the relative movement of the liquid injection valve. The lower end of the liquid adding cylinder is connected with a liquid injection valve mounting plate, and a plurality of liquid injection valves are arranged at intervals on the liquid injection valve mounting plate. The liquid injection valve is fixed by a liquid injection valve fixing block on the liquid injection valve mounting plate, and the liquid injection valve driving mechanism includes a slider 2 fixedly connected with the slider adapter, the slider 2 is slidably connected with the second linear guide rail, and the slider adapter is connected with the second synchronous belt. The second synchronous belt is driven and connected by a servo motor 3, and the servo motor 3 is connected with a reducer 3, a second synchronous wheel and a third synchronous wheel.

[0016] (III) Beneficial effects

[0017] The present invention uses a servo motor to drive the coordinated operation of each actuator to complete the injection operation of the cylindrical lithium battery. The present invention has a flexible design and a compact structure. The corresponding injection cup can be replaced according to the size of different products, so as to adapt to a wide range of battery models. During the injection work, one action can perform liquid addition operations on 18 batteries at the same time; every 18 cups are integrated on a cup adapter plate. When changing the model, it is only necessary to install the cup and the cup adapter plate offline and then install them together under the injection base plate, so as to achieve rapid model change. The single-station single injection of the mechanism can reach 324 batteries, and the injection efficiency is high. Compared with traditional injection equipment, the present invention has the advantages of fast model change speed and high injection efficiency; it not only reduces the production cost, but also simplifies the difficulty of equipment maintenance, and greatly improves the operation stability and reliability of the equipment; in addition, after the injection, the gas circuit system is connected through a vacuum tube, the internal pressure of the battery can be adjusted and the residual electrolyte can be discharged, so as to achieve the effect of cleaning the waste liquid and making the electrolyte fully infiltrate the battery core, thereby improving the battery quality.

[0018] The present invention is very suitable for large-scale promotion and application by enterprises, and can effectively improve the flexibility and efficiency of lithium battery production lines, helping battery manufacturers to cope with diverse market demands. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is a three-dimensional diagram of a cylindrical battery liquid injection device according to the present invention;

[0021] Figure 2 It is a three-dimensional diagram of a liquid injection assembly in a cylindrical battery liquid injection device according to the present invention;

[0022] Figure 3It is a cross-sectional view of a liquid injection assembly in a cylindrical battery liquid injection device according to the present invention;

[0023] Figure 4 It is a three-dimensional diagram of a liquid injection cup assembly in a cylindrical battery liquid injection device according to the present invention;

[0024] Figure 5 It is a three-dimensional diagram of a lifting assembly of a liquid injection port blocking rod in a cylindrical battery liquid injection device according to the present invention;

[0025] Figure 6 It is a stereoscopic diagram of a waste liquid collection assembly in a cylindrical battery liquid injection device according to the present invention;

[0026] Figure 7 It is a stereoscopic diagram of a liquid injection valve moving assembly in a cylindrical battery liquid injection device described in the present invention.

[0027] The reference numerals are as follows:

[0028] 1. Liquid injection assembly; 2. Liquid injection cup assembly; 3. Liquid injection port plugging rod lifting assembly; 4. Waste liquid collection assembly; 5. Liquid injection valve moving assembly; 6. Rack; 100. Plug rod lifting plate; 101. Lifting cylinder; 102. Liquid injection base plate; 103. Air circuit board; 104. Sealing cover plate; 105. Lifting drive; 106. Liquid injection cup sleeve; 107. Air circuit pipe; 200. Liquid injection cavity; 201. Liquid inlet Cavity; 202, liquid injection cup; 203, liquid injection nozzle; 204, second lifting blocking rod; 205, liquid injection tank; 206, sealing rubber plug; 207, liquid injection needle; 208, liquid inlet; 209, liquid inlet channel; 300, blocking rod mounting plate; 301, blocking rod driving mechanism; 302, first lifting blocking rod; 303, mounting plate guide assembly; 304, electric cylinder; 305, servo motor 1; 306, reduction Speed ​​machine one; 307, guide column; 308, linear bearing; 400, waste liquid collection box; 401, waste liquid box drive mechanism; 402, slider adapter plate; 403, first synchronous belt; 404, slider one; 405, first linear guide; 406, first synchronous wheel; 407, first synchronous shaft; 408, servo motor two; 409, speed reducer two; 500, liquid adding mechanism; 501, liquid injection valve drive mechanism; 502, installation horizontal plate; 503, slider adapter seat; 504, installation vertical plate; 505, liquid adding cylinder; 506, liquid injection valve installation plate; 507, liquid injection valve; 508, liquid injection valve fixing block; 509, slider two; 510, second linear guide; 511, second synchronous belt; 512, servo motor three; 513, speed reducer three; 514, second synchronous wheel; 515, third synchronous wheel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present application, it should be understood that the terms "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] See also Figure 1-Figure 7 The present invention provides a technical solution: a cylindrical battery liquid injection device, comprising a liquid injection assembly (1), wherein the liquid injection assembly (1) comprises a liquid injection cup assembly (2). The liquid injection cup assembly (2) comprises a liquid injection cavity (200) and a liquid inlet cavity (201), wherein a liquid injection cup (202) is formed between the liquid injection cavity (200) and the liquid inlet cavity (201), wherein a liquid injection nozzle (203) is formed at the bottom of the liquid injection cup (202), and a second lifting and blocking rod (204) is provided at the liquid injection nozzle (203). A liquid injection groove (205) is formed at the bottom of the liquid injection cavity (200), wherein a sealing rubber plug (206) matching with the second lifting and blocking rod (204) is installed inside the liquid injection groove (205), and a liquid injection needle (207) is formed at the bottom of the liquid injection groove (205). A liquid inlet (208) is formed in the liquid inlet cavity (201), and the liquid inlet is connected to a liquid inlet channel (209). When the liquid is connected to the liquid inlet (208), the liquid can enter the liquid inlet cavity (201), and when the second lifting blocking rod (204) is away from the sealing plug (206), the liquid can enter the injection needle (207). When liquid is required to be injected, the first lifting blocking rod (302) is located above the liquid inlet channel (209), and the electrolyte flows from the injection valve (507) through the liquid inlet channel (209) and the liquid inlet (208) to reach the liquid inlet cavity (201). When liquid injection is required, the injection port blocking rod lifting assembly (3) descends, the first lifting blocking rod (302) blocks the liquid inlet channel (209), and the second lifting blocking rod (204) rises under the action of the lifting cylinder (101), and the electrolyte flows into the battery along the injection needle (207). At the same time, the positive and negative pressure states in the battery-filling cup assembly system are switched through the gas line tube, so that the electrolyte can fully infiltrate the battery cell and improve the battery quality.

[0032] Specifically, the liquid injection assembly (1) further comprises a blocking rod lifting plate (100), a lifting cylinder (101), a liquid injection base plate (102) and a gas path plate (103); a sealing cover plate (104) is fixed to the upper end of the liquid inlet cavity (201); a liquid inlet channel (209) passes through the sealing cover plate (104) and communicates with the liquid inlet (208); a second lifting blocking rod (204) passes through the sealing cover plate (104) and is connected to a lifting drive member (105); and the lifting drive member (105) is fixedly connected to the blocking rod lifting plate (100); and the lifting cylinder (101) is mounted on the blocking rod lifting plate (100).

[0033] Specifically, the liquid inlet cavity (201) is fixedly mounted on the liquid injection substrate (102), the liquid injection substrate (102) is fixedly connected to an air circuit plate (103) and an injection cup sleeve (106) arranged outside the liquid injection cavity (200), and the air circuit plate (103) includes a sealing cover plate (104) and is connected to an air circuit pipe (107).

[0034] Specifically, the liquid injection assembly (1) is fixed on a frame (6), and the frame (6) is sequentially arranged from top to bottom with a liquid injection port blocking rod lifting assembly (3), a liquid injection valve moving assembly (5), a liquid injection assembly (1), and a waste liquid collection assembly (4).

[0035] Specifically, a liquid injection port blocking rod lifting assembly (3) is correspondingly arranged at the top of the liquid injection assembly (1); the liquid injection port blocking rod lifting assembly (3) comprises a blocking rod mounting plate (300) and a blocking rod driving mechanism (301) for controlling the lifting and lowering movement of the liquid injection port blocking rod lifting assembly (3). The blocking rod mounting plate (300) is mounted with a first lifting blocking rod (302); when the blocking rod driving mechanism (301) drives the blocking rod mounting plate (300) to move downward, the first lifting blocking rod (302) is embedded in and blocks the liquid inlet channel (209).

[0036] Specifically, the blocking rod driving mechanism (301) includes a blocking rod mounting plate guide assembly (303), an electric cylinder (304), a servo motor (305), and a reducer (306) connected to the servo motor (305). The mounting plate guide assembly (303) includes a guide column (307) and a linear bearing (308).

[0037] Specifically, a waste liquid collection component (4) is correspondingly arranged below the liquid injection component (1), and the waste liquid collection component (4) comprises a waste liquid collection box (400) and a waste liquid box driving mechanism (401).

[0038] Specifically, the waste liquid box driving mechanism (401) is used to drive the waste liquid collection box (400) to move horizontally to receive the liquid dripped from the liquid injection cup assembly (2) after the liquid injection is completed. The waste liquid box driving mechanism (401) includes a slider adapter plate (402) connected and fixed to both ends of the waste liquid collection box (400), the slider adapter plate (402) is fixedly connected to the first synchronous belt (403) and the slider one (404), the slider one (404) is slidably connected to the first linear guide rail (405); the first synchronous belt (403) is equipped with a first synchronous wheel (406), and the first synchronous wheel (406) is connected to the first synchronous shaft (407); the first synchronous shaft (407) is connected and equipped with a servo motor two (408) and a reducer two (409).

[0039] Specifically, a liquid injection valve moving assembly (5) is arranged at the upper end of the liquid injection assembly (1). The liquid injection valve moving assembly (5) includes a liquid adding mechanism (500) and a liquid injection valve driving mechanism (501). The liquid adding mechanism (500) includes a mounting horizontal plate (502). The mounting horizontal plate (502) is mounted and connected with a slider adapter seat (503), a mounting vertical plate (504) and a liquid adding cylinder (505) for controlling the relative movement of a liquid injection valve (507). The lower end of the liquid adding cylinder (505) is connected with a liquid injection valve mounting plate (506), and a plurality of liquid injection valves (507) are arranged at intervals on the liquid injection valve mounting plate (506). The injection valve (507) is fixed by the injection valve fixing block (508) on the injection valve mounting plate (506), and the injection valve driving mechanism (501) includes a slider 2 (509) fixedly connected to the slider adapter (503), the slider 2 (509) is slidably connected to the second linear guide rail (510), and the slider adapter (503) is connected to the second synchronous belt (511). The second synchronous belt (511) is driven and connected by the servo motor 3 (512), and the servo motor 3 (512) is connected to the reducer 3 (513), the second synchronous wheel (514) and the third synchronous wheel (515).

[0040] By adopting the above technical solution, during operation, the servo motor drives the synchronous wheel and the synchronous belt to drive the injection valve moving assembly (5) to move to the injection channel (209) position of the corresponding injection assembly (1), and the injection valve (507) injects electrolyte into the injection channel (209) according to the instructions sent by the PLC control device. After all the injection cups (202) are filled, the injection valve moving assembly (5) returns to its original position. The fixture transplanting and lifting mechanism lifts the full fixture into the injection cup sleeve (106). The servo motor drives the reducer and the electric cylinder to drive the injection port blocking rod lifting assembly (3) to descend, and the first lifting blocking rod (302) presses the injection port (208). The vacuum solenoid valve opens, and the injection assembly (1) starts to evacuate the battery and the injection cup (202) at the same time. After the pressure reaches -90KPa, the solenoid valve closes and starts to maintain pressure. After the pressure maintenance time is reached, if the pressure is within the allowable range, the vacuum solenoid valve opens and injection starts at the same time. The lifting cylinder (101) in the liquid injection assembly (1) drives the blocking rod lifting plate (100) to drive the second lifting blocking rod (204) to rise, and the electrolyte automatically flows into the battery from the gap between the second lifting blocking rod (204) and the liquid injection tank (205), and then is filled with 0.5MPa nitrogen. After a certain period of time, vacuum is drawn, and then nitrogen filling and vacuum drawing are performed alternately. After a certain period of time, the vacuum is broken, and the fixture transfer lifting mechanism descends to drive the fixture to descend. The fixture transfer assembly drag module drags the fixture away from the liquid injection position of the liquid injection mechanism. Afterwards, the servo motor drives the synchronous wheel and the synchronous belt to drive the waste liquid collection box (400) to move to the first waste liquid collection position, and nitrogen is filled in to clean the inner wall of the injection cup. After the inner wall of the injection cup is cleaned, the lifting cylinder (101) in the injection assembly (1) drives the blocking rod lifting plate (100) to drive the second lifting blocking rod (204) to descend, and nitrogen is filled in to clean the inner hole of the second lifting blocking rod (204). When the inner hole of the second lifting blocking rod is cleaned, the injection action is completed.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cylindrical battery injection device, characterized in that: The invention comprises a liquid injection component, wherein the liquid injection component comprises a liquid injection cup component; the liquid injection cup component comprises a liquid injection cavity and a liquid inlet cavity, an liquid injection cup is formed between the liquid injection cavity and the liquid inlet cavity, a liquid injection nozzle is formed at the bottom of the liquid injection cup, and a second lifting blocking rod is arranged at the liquid injection nozzle; a liquid injection groove is formed at the bottom of the liquid injection cavity, a sealing rubber plug which matches the second lifting blocking rod is installed on the inner side of the liquid injection groove, and a liquid injection needle is formed at the bottom end of the liquid injection groove; a liquid inlet is formed in the liquid inlet cavity, and the liquid inlet is connected with a liquid inlet channel; when the liquid is connected with the liquid inlet, the liquid can enter the liquid inlet cavity, and when the second lifting blocking rod is away from the sealing rubber plug, the liquid can enter the liquid injection needle.

2. A cylindrical battery liquid injection device according to claim 1, characterized in that: The liquid injection assembly also includes a blocking rod lifting plate, a lifting cylinder, a liquid injection base plate and an air circuit plate; a sealing cover plate is fixed to the upper end of the liquid inlet cavity; the liquid inlet channel passes through the sealing cover plate and is connected to the liquid inlet, the second lifting blocking rod passes through the sealing cover plate and is connected to the lifting drive member, and the lifting drive member is fixedly connected to the blocking rod lifting plate; the lifting cylinder is installed on the blocking rod lifting plate.

3. A cylindrical battery liquid injection device according to claim 2, characterized in that: The liquid inlet cavity is fixedly mounted on the liquid injection base plate, the liquid injection base plate is fixedly connected to the gas circuit plate and the liquid injection cup sleeve arranged outside the liquid injection cavity, and the gas circuit plate includes the sealing cover plate and is connected to the gas circuit pipe.

4. A cylindrical battery liquid injection device according to claim 1, characterized in that: The liquid injection assembly is fixed on a frame, and the frame is sequentially arranged from top to bottom with a liquid injection port blocking rod lifting assembly, a liquid injection valve moving assembly, a liquid injection assembly, and a waste liquid collecting assembly.

5. A cylindrical battery liquid injection device according to claim 1, characterized in that: A liquid injection port blocking rod lifting assembly is correspondingly arranged on the top of the liquid injection assembly; the liquid injection port blocking rod lifting assembly includes a blocking rod mounting plate and a blocking rod driving mechanism for controlling the lifting movement of the liquid injection port blocking rod lifting assembly; the blocking rod mounting plate is installed with a first lifting blocking rod, and when the blocking rod driving mechanism drives the blocking rod mounting plate to move downward, the first lifting blocking rod is embedded in and blocks the liquid inlet channel.

6. A cylindrical battery liquid injection device according to claim 5, characterized in that: The blocking rod driving mechanism includes a blocking rod mounting plate guide assembly, an electric cylinder, a servo motor and a reducer connected to the servo motor; the mounting plate guide assembly includes a guide column and a linear bearing.

7. A cylindrical battery liquid injection device according to claim 1, characterized in that: A waste liquid collecting component is correspondingly arranged below the liquid injection component, and the waste liquid collecting component includes a waste liquid collecting box and a waste liquid box driving mechanism.

8. A cylindrical battery liquid injection device according to claim 7, characterized in that: The waste liquid box driving mechanism is used to drive the waste liquid collection box to move horizontally to receive liquid dripping from the injection cup assembly after the injection is completed; the waste liquid box driving mechanism includes a slider adapter plate connected and fixed to both ends of the waste liquid collection box, the slider adapter plate is fixedly connected to the first synchronous belt and slider one, the slider one is slidably connected to the first linear guide rail; the first synchronous belt is cooperated with the first synchronous wheel, the first synchronous wheel is connected to the first synchronous rotating shaft; the first synchronous rotating shaft is connected and installed with servo motor two and reducer two.

9. A cylindrical battery liquid injection device according to claim 1, characterized in that: A liquid injection valve moving assembly is provided at the upper end of the liquid injection assembly; the liquid injection valve moving assembly includes a liquid adding mechanism and a liquid injection valve driving mechanism; the liquid adding mechanism includes a mounting horizontal plate, and the mounting horizontal plate is installed and connected with a slider adapter, a mounting vertical plate and a liquid adding cylinder for controlling the relative movement of the liquid injection valve; the lower end of the liquid adding cylinder is connected with a liquid injection valve mounting plate, and a plurality of liquid injection valves are arranged at intervals on the liquid injection valve mounting plate; the liquid injection valve is installed and fixed by a liquid injection valve fixing block on the liquid injection valve mounting plate; the liquid injection valve driving mechanism includes a slider 2 fixedly connected to the slider adapter, the slider 2 is slidably connected to the second linear guide rail, and the slider adapter is connected to the second synchronous belt; the second synchronous belt is driven and connected by a servo motor 3, and the servo motor 3 is connected with a reducer 3, a second synchronous wheel and a third synchronous wheel.

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