Automatic liquid injection device for battery production

Abstract

The invention discloses an automatic liquid injection device for battery production, which comprises a liquid injection mechanism, the liquid injection mechanism is provided with a liquid injection unit, the liquid injection unit is connected with a liquid storage tank, and an atomization unit is arranged between the liquid storage tank and the liquid injection unit; the atomization unit comprises an atomization generator, a plurality of ultrasonic transducers are arranged in the atomization generator, the atomization generator is installed on an atomization cavity, and a spiral flow guide pipe and a porous baffle are arranged in the atomization cavity. According to the invention, the electrolyte is atomized through the arranged atomization unit, the atomized electrolyte with smaller and uniform particle size is formed, and the electrolyte is ensured to be uniformly distributed in macroscopic and microscopic levels in the battery and fully infiltrate the pole piece in cooperation with the liquid injection nozzle with a special structure, so that the problem of inconsistent battery performance caused by non-uniform liquid injection is avoided, and the service life of the battery is prolonged. Therefore, each battery unit can obtain sufficient and uniform electrolyte supply, and the stability and the reliability of the battery performance are further enhanced.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of battery production, and in particular to an automatic liquid injection device for battery production. Background Art

[0002] As environmental pollution caused by energy applications becomes increasingly serious, the new energy industry has received increasing support, and power storage devices represented by lithium-ion batteries have developed rapidly. In the production process of lithium batteries, injecting liquid into the lithium battery shell is an important step in the lithium battery processing process.

[0003] The prior art discloses a liquid injection device for battery production, wherein the liquid injection device for battery production pushes the liquid injection head downward to separate the connecting plate from the bracket, and the elastic force of the second spring drives the roller to squeeze the fixing plate through the oblique opening to drive the collecting box to retract, and the collecting box compresses the elastic airbag to slowly release the gas inside the elastic airbag, and heats the gas through the heating ring to discharge the gas into the battery cell package through the gas outlet head group, thereby realizing the internal heating operation of the battery cell package, and the collecting box also drives the teeth to mesh with the second gear to drive the rotating shaft to rotate, and the rotating shaft drives the rotating rod to rotate through the belt transmission structure, so that the cam cooperates with the first spring to drive the storage frame to reciprocate, and the reciprocating movement of the battery cell package keeps the hot air evenly blowing in the inner cavity of the battery cell, thereby utilizing thermal conductivity to completely discharge the moisture in the electrode piece, increase the temperature of the electrode piece, and improve the subsequent wetting effect of the electrode piece surface after the electrolyte.

[0004] However, although the above technology sets up an auxiliary infiltration mechanism wheel to promote infiltration by heating and shaking the battery pack, the infiltration effect of these operations on battery packs of different models and different internal structures may be different. For example, for battery packs with complex internal pole piece structures and low porosity, relying solely on the current hot air blowing and simple shaking may not ensure that the electrolyte fully infiltrates every corner of the pole piece, and it is difficult to ensure that the electrolyte absorption rate reaches an ideal level, which in turn affects the overall performance of the battery. Summary of the invention

[0005] The present invention mainly provides an automatic liquid injection device for battery production, which is used to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: An automatic liquid injection device for battery production, comprising a liquid injection mechanism, wherein the liquid injection mechanism is provided with a liquid injection unit, the liquid injection unit is connected to a liquid storage tank, and an atomization unit is provided between the liquid storage tank and the liquid injection unit; The atomization unit comprises an atomization generator, the atomization generator contains a plurality of ultrasonic transducers, and the atomization generator is installed on an atomization chamber, and a spiral guide tube and a porous baffle are arranged in the atomization chamber.

[0007] Preferably, the atomization chamber is made of stainless steel, the spiral flow guide tube is arranged in the upper half of the atomization chamber, and the spiral flow guide tube is located within the action range of the atomization generator; The porous baffle is arranged in the lower half of the atomization chamber, and circular holes with a size of 10-50 microns are arranged in a matrix on the porous baffle.

[0008] Preferably, the injection unit includes an injection nozzle and an adjustment component. The injection nozzle is made of corrosion-resistant stainless steel and is cylindrical in shape as a whole. The injection nozzle is connected to the atomization unit through an injection pipe. In addition, a multi-layer structure is provided inside the injection nozzle, which includes a spiral diversion layer, a guide layer and a spray hole layer from the inside to the outside.

[0009] Preferably, the adjusting component includes a driving motor, which is arranged at the top of the injection mechanism, and the output end of the driving motor is transmission-connected to a lifting screw, a lifting platform is provided on the lifting screw, the injection nozzle is installed at the bottom of the lifting platform, and a distance sensor is also provided at the bottom of the lifting platform. In addition, the driving motor and the distance sensor are electrically connected to a PLC controller.

[0010] Preferably, the spiral diverter layer is composed of a continuous spiral groove with a groove depth of 1-2 mm, a width of 2-3 mm, a pitch of 5-10 mm, and an outlet of the spiral diverter layer is connected to an inlet of the guide layer.

[0011] Preferably, the guide layer is composed of a plurality of radially distributed guide tubes, the number of which can be adjusted according to the size and model of the battery, and the inner diameter of the guide tube is 1-1.5 mm and the length is 10-15 mm.

[0012] Preferably, the spray hole layer is evenly distributed with a plurality of spray holes distributed in an annular manner along the circumferential direction of the liquid injection nozzle, the diameter of the spray holes is 0.5-1 mm, and the central angle between adjacent spray holes is 15°-30°.

[0013] Preferably, the injection mechanism is further provided with a limit unit, the limit unit comprises an electric telescopic rod, the telescopic end of the electric telescopic rod is connected to a limit plate, a pressure sensor is provided on the surface of the limit plate, and the pressure sensor is electrically connected to the PLC controller.

[0014] Preferably, the liquid injection mechanism is arranged on a conveyor belt, a material distribution unit is arranged at one end of the conveyor belt, a photoelectric sensor is arranged between the material distribution unit and the liquid injection mechanism, and the photoelectric sensor is electrically connected to a PLC controller.

[0015] Preferably, the material distribution unit comprises a material distribution cylinder, and two material distribution telescopic rods are connected to the material distribution cylinder. The spacing between the two material distribution telescopic rods is the same as the size of the battery to be injected, and the two material distribution telescopic rods are synchronously staggered and telescopic.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention atomizes the electrolyte through the atomizing unit to form atomized electrolyte with smaller and more uniform particle size. The specially structured liquid injection nozzle ensures that the electrolyte is evenly distributed at both the macro and micro levels inside the battery and fully infiltrates the pole piece, thereby avoiding the problem of inconsistent battery performance caused by uneven liquid injection, so that each battery cell can obtain sufficient and uniform electrolyte supply, further enhancing the stability and reliability of battery performance.

[0017] 2. The spiral guide plate provided in the present invention can make the electrolyte form a stable spiral flow during the atomization process, increase the atomization time and effect of the electrolyte under the action of ultrasound, and the porous baffle further refines and homogenizes the atomized electrolyte particles in the lower half of the cavity to prevent the formation and aggregation of large particles, thereby ensuring that the electrolyte entering the battery has good uniformity at the microscopic level.

[0018] 3. The spiral flow-dividing layer of the liquid injection nozzle provided in the present invention preliminarily disperses the electrolyte by centrifugal force, the flow-guiding layer further refines it into multiple independent thin streams, and the orifice layer injects the electrolyte into the battery at a specific angle and speed to form a spiral track. This series of fine flow-dividing and precise injection actions ensures the uniform distribution of the electrolyte at the macro level inside the battery.

[0019] 4. The present invention monitors the distance between the injection nozzle and the battery through the distance sensor, and the PLC controller controls the drive motor in real time according to the sensor feedback information, thereby adjusting the nozzle height. This intelligent adjustment mechanism can perform personalized injection operations for batteries of different heights, ensuring that the distance between the nozzle and the battery is in the best state during each injection, thereby accurately controlling the injection speed and flow rate of the electrolyte, effectively improving the accuracy of injection, reducing the battery performance differences caused by injection volume deviation, and improving the consistency of product quality.

[0020] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the back of the overall structure of the present invention; Figure 3 It is a front view of the liquid injection mechanism of the present invention; Figure 4is a cross-sectional view of an atomization unit of the present invention; Figure 5 It is a schematic diagram of the structure of the liquid injection nozzle of the present invention; Figure 6 It is a front cross-sectional view of the liquid injection nozzle of the present invention; Figure 7 It is a top view cross-sectional view of the liquid injection nozzle of the present invention; Figure 8 It is a top view of the material distribution unit of the present invention.

[0022] Description of the drawings: 1. Liquid injection mechanism; 2. Liquid injection unit; 201. Liquid injection nozzle; 2011. Spiral diversion layer; 2012. Guide layer; 2013. Spray hole layer; 2014. Guide pipe; 2015. Spray hole; 202. Liquid injection pipeline; 3. Adjustment component; 301. Drive motor; 302. Lifting screw rod; 303. Lifting platform; 304. Distance sensor; 4. Atomization unit; 401. Atomization generator; 402. Atomization cavity; 403. Spiral guide pipe; 404. Porous baffle; 5. Liquid storage tank; 6. PLC controller; 7. Limit unit; 701. Electric telescopic rod; 702. Limit plate; 703. Pressure sensor; 8. Conveyor belt; 9. Material distribution unit; 901. Material distribution cylinder; 902. Material distribution telescopic rod; 10. Photoelectric sensor. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive. Example

[0024] Please refer to the attached Figure 1 , 2 As shown in , 4, an automatic liquid injection device for battery production includes a liquid injection mechanism 1, the liquid injection mechanism 1 is provided with a liquid injection unit 2, the liquid injection unit 2 is connected to a liquid storage tank 5, an atomization unit 4 is provided between the liquid storage tank 5 and the liquid injection unit 2, the atomization unit 4 includes an atomization generator 401, the atomization generator 401 contains a plurality of ultrasonic transducers, and the atomization generator 401 is installed on an atomization chamber 402, a spiral guide tube 403 is provided in the upper half of the atomization chamber 402, and a porous baffle 404 is provided in the lower half of the chamber.

[0025] It should be noted that the ultrasonic transducer converts electrical energy into high-frequency mechanical vibration (ultrasound) and acts on the electrolyte to overcome the surface tension and form tiny droplets. The operating frequency of the ultrasonic transducer is adjustable in the range of 20kHz-100kHz, and the power is controllable between 100W-500W. By changing the operating frequency and power of the transducer, the atomization degree and particle size of the electrolyte can be precisely controlled. When atomized electrolyte with smaller particles is required, the ultrasonic frequency can be increased and the power can be appropriately increased; when the atomization degree is not required but a larger flow rate of electrolyte is required, the frequency can be reduced and the power can be adjusted to an appropriate level.

[0026] It should be noted that the atomization chamber 402 is made of stainless steel, which has good corrosion resistance and can resist chemical erosion by the electrolyte, thus ensuring the structural integrity and service life of the chamber. At the same time, it also has high strength and can withstand a certain internal pressure, providing a stable spatial environment for the atomization process. Moreover, stainless steel is relatively easy to clean and maintain, which helps to keep the chamber clean and prevent impurities from mixing into the atomized electrolyte and affecting the injection quality.

[0027] It should be noted that the spiral guide tube 403 is arranged in the upper half of the atomization chamber 402 and is located within the action range of the atomization generator 401. Its spiral shape can guide the electrolyte to form a stable spiral flow under the action of ultrasound, thereby increasing the atomization time and effect of the electrolyte under the action of ultrasound. When the electrolyte flows along the spiral guide tube 403, due to the extended path, the ultrasound has more opportunities to continuously act on the electrolyte, causing more large droplets to be broken into small droplets, thereby improving the overall atomization quality.

[0028] It should be noted that the porous baffle 404 has circular holes of 10-50 microns arranged in a matrix. When the atomized electrolyte particles pass through the porous baffle 404, the large particles will be blocked and broken up because they cannot pass through the pores smoothly, and further split into smaller particles. At the same time, it can also make the small particles more evenly distributed to prevent local particle aggregation. In this way, after the porous baffle 404, the electrolyte droplets flowing out from the bottom outlet of the atomization chamber 402 have a smaller particle size and a more even distribution. After being transported to the injection nozzle 201 through the injection pipe 202 made of flexible material, it can be injected into the battery casing in a more ideal state, ensuring the uniformity of the electrolyte distribution inside the battery and improving the performance and quality of the battery.

[0029] Please refer to the attached Figure 3 , 5As shown in , 6 and 7, the liquid injection unit 2 includes a liquid injection nozzle 201 and an adjustment component 3. The liquid injection nozzle 201 is made of corrosion-resistant stainless steel and is cylindrical in shape. It is connected to the atomization unit 4 through a liquid injection pipe 202. The liquid injection nozzle 201 is provided with a multi-layer structure, which is a spiral diversion layer 2011, a guide layer 2012 and a spray hole layer 2013 from the inside to the outside. The adjustment component 3 includes a drive motor 301, which is arranged at the top of the liquid injection mechanism 1, and the output end of the drive motor 301 is transmission-connected with a lifting screw 302, and a lifting platform 303 is sleeved on the lifting screw 302. The liquid injection nozzle 201 is installed at the bottom of the lifting platform 303, and a distance sensor 304 is also provided at the bottom of the lifting platform 303. In addition, the drive motor 301 and the distance sensor 304 are both electrically connected to the PLC controller 6.

[0030] It should be noted that the spiral diverter layer 2011 is composed of a continuous spiral groove with a groove depth of 1-2 mm, a width of 2-3 mm, a pitch of 5-10 mm, and the outlet of the spiral diverter layer 2011 is connected to the inlet of the guide layer 2012. When the electrolyte enters the spiral groove of the spiral diverter layer 2011, the electrolyte will flow along the spiral path, and its flow rate and pressure will change accordingly. Due to the spiral direction of the groove, the electrolyte constantly changes the flow direction, producing an effect similar to circular motion. In this flow state, the electrolyte will be affected by the centripetal force, and at the same time, a corresponding centrifugal force will inevitably be generated.

[0031] It should be noted that the flow guide layer 2012 is composed of a plurality of radially distributed flow guide tubes 2014, the number of which can be adjusted between 6 and 12 according to the size and model of the battery, and the inner diameter of the flow guide tube 2014 is 1-1.5 mm, and the length is 10-15 mm. The radially distributed flow guide tubes 2014 further refine the electrolyte preliminarily dispersed by the spiral flow dividing layer 2011 into a larger number of more uniform independent thin streams, which have a relatively stable flow direction and flow rate when flowing out of the flow guide tubes 2014, and are fully prepared for the multi-angle and multi-speed injection through the spray hole layer 2013. In addition, by reasonably adjusting the number of flow guide tubes 2014, the injection of batteries of different specifications can be adapted.

[0032] It should be noted that the spray hole layer 2013 is evenly distributed with a plurality of spray holes 2015 distributed in an annular manner along the circumferential direction of the injection nozzle 201, the diameter of the spray holes 2015 is 0.5-1 mm, and the center angle between adjacent spray holes 2015 is 15°-30°. When the electrolyte is sprayed out from the spray holes 2015 of the spray hole layer 2013 in the form of fine liquid columns, a spiral injection track can be formed along the inner wall of the battery, so that the electrolyte can achieve good fluidity inside the battery along the spiral track, fully fill every corner of the battery, improve the infiltration effect and distribution uniformity of the electrolyte inside the battery, and thus help improve the charge and discharge performance and overall quality of the battery.

[0033] It should be noted that the driving motor 301 drives the lifting screw 302 to rotate, so that the lifting platform 303 mounted thereon can move up and down, thereby controlling the height position of the liquid injection nozzle 201. The distance sensor 304 can detect the distance between the liquid injection nozzle 201 and the battery in real time, and feed back the signal to the PLC controller 6. The PLC controller 6 accurately controls the operation of the driving motor 301 according to the preset program and distance information, ensuring that the liquid injection nozzle 201 maintains a suitable distance from the battery, achieving accurate liquid injection, and meeting the liquid injection requirements of batteries of different sizes, while also avoiding the occurrence of collisions between the liquid injection nozzle 201 and the battery.

[0034] It should be noted that the atomization unit 4 allows the electrolyte to enter the battery in the form of mist, which can better fill the tiny pores and complex structures inside the battery. However, for some larger spaces or areas where the electrolyte needs to be quickly filled, the atomization method may be insufficient in speed. The injection nozzle 201 can quickly deliver a certain amount of electrolyte to these areas through its special diversion and injection method, and combine with the atomized electrolyte, which not only ensures the uniform distribution of the electrolyte at the microscopic level, but also meets the battery's requirements for electrolyte filling speed and amount at the macroscopic level, thereby more effectively improving the electrolyte infiltration efficiency.

[0035] Please refer to the attached Figure 1 , 2 As shown in , 3, and 8, the injection mechanism 1 is arranged on the conveyor belt 8, and the injection mechanism 1 is provided with a limit unit 7, which includes an electric telescopic rod 701, and the telescopic end of the electric telescopic rod 701 is connected to a limit plate 702, and a pressure sensor 703 is provided on the surface of the limit plate 702. One end of the conveyor belt 8 is provided with a material distribution unit 9, and the material distribution unit 9 includes a material distribution cylinder 901, and two material distribution telescopic rods 902 are connected to the material distribution cylinder 901. The spacing between the two material distribution telescopic rods 902 is the same as the size of the battery to be injected, and the two material distribution telescopic rods 902 are synchronously staggered and extended. A photoelectric sensor 10 is provided between the material distribution unit 9 and the injection mechanism 1, and the pressure sensor 703 and the photoelectric sensor 10 are both electrically connected to the PLC controller 6.

[0036] It should be noted that the telescopic movements of the two material-dividing telescopic rods 902 of the material-dividing cylinder 901 are staggered, that is, when one material-dividing telescopic rod 902 is in an extended state, the other material-dividing telescopic rod 902 is in a retracted state. During material-dividing, the material-dividing telescopic rod 902 close to the injection mechanism 2 is retracted to release the battery, while the other material-dividing telescopic rod 902 is extended to limit the next battery, so that only one battery can be released at a time.

[0037] It should be noted that when the battery passes through the photoelectric sensor 10, the photoelectric sensor 10 sends a signal to the PLC controller 6, and the PLC controller 6 controls the electric telescopic rod 701 to push the limit plate 702 to limit the battery, ensuring that the battery is in the accurate injection position, and the pressure sensor 703 can detect the pressure between the limit plate 702 and the battery. When the pressure exceeds or is lower than the set range, the signal is fed back to the PLC controller 6. The PLC controller 6 can judge whether the placement state of the battery is normal, or whether there is an abnormal stress situation, and then take corresponding measures, such as issuing an alarm or suspending injection, etc., to ensure the safety and accuracy of the injection operation.

[0038] It should be noted that the entire device realizes the automated coordinated control of various components through the PLC controller 6. Each sensor (distance sensor 304, pressure sensor 703, photoelectric sensor 10, etc.) feeds back the detected real-time information to the PLC controller 6, and the PLC controller 6 coordinates and manages the injection operation of the injection mechanism 1 (controlling the position and injection process of the injection nozzle 201 through the adjustment component 3), the limit and pressure monitoring of the limit unit 7, the operation of the conveyor belt, and the diversion of the material distribution unit 9 according to the preset program logic, so that the entire automatic injection device for battery production can efficiently, accurately and stably complete the battery injection work, improve the quality and efficiency of battery production, and reduce the errors and uncertainties caused by manual intervention.

[0039] The specific operation process of the present invention is as follows: Turn on the device power, start the PLC controller 6, start the conveyor belt 8 and the material distribution unit 9, the material distribution unit 9 releases a battery, when the battery passes the photoelectric sensor 10, the photoelectric sensor 10 sends a signal to the PLC controller 6, the PLC controller 6 instructs the electric telescopic rod 701 of the limit unit 7 to extend, push the limit plate 702 to limit the battery, and the pressure sensor 703 monitors the pressure and gives feedback; At the same time, the distance sensor 304 detects the distance between the injection nozzle 201 and the battery and transmits data to the PLC controller, which controls the drive motor 301 to rotate, drives the lifting screw 302 to rotate, and then drives the lifting platform 303 to move, so as to adjust the height of the injection nozzle 201; The electrolyte in the liquid storage tank 5 flows into the atomization unit 4 under pressure, and the atomization generator 401 atomizes the electrolyte in the atomization chamber 402. The spiral guide tube 403 guides the electrolyte into a spiral flow to enhance the atomization effect. After the porous baffle 404 refines the uniform particles, it passes through the injection pipe 202 to the injection nozzle 201. In the injection nozzle 201, the electrolyte is first centrifugally diverted according to the spiral grooves in the spiral diversion layer 2011, and then refined into multiple thin streams through the radial guide tube 2014 of the guide layer 2012, and finally injected into the battery in a spiral shape at a specific angle and speed through the annular nozzle 215 of the nozzle layer 2013. The injection amount and time are controlled by the PLC controller 6 according to the preset program; After reaching the preset injection volume or time, the injection is stopped under the action of the PLC controller, and the driving motor 301 is reversed to raise the injection nozzle 201 to the initial height. Then the PLC controller 6 shortens the electric telescopic rod 701 and the limit plate 702 moves away from the battery. The battery is transported to the next process under the action of the conveyor belt 8, and the material distribution unit 9 releases another battery, and the above operation is repeated.

[0040] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An automated liquid injection device for battery production, comprising a liquid injection mechanism (1), characterized in that: The liquid injection mechanism (1) is provided with a liquid injection unit (2), the liquid injection unit (2) is connected to a liquid storage tank (5), and an atomization unit (4) is provided between the liquid storage tank (5) and the liquid injection unit (2); The atomization unit (4) comprises an atomization generator (401), wherein the atomization generator (401) contains a plurality of ultrasonic transducers, and the atomization generator (401) is mounted on an atomization chamber (402), wherein a spiral flow guide tube (403) and a porous baffle (404) are provided in the atomization chamber (402).

2. The automatic liquid injection device for battery production according to claim 1, characterized in that: The atomization chamber (402) is made of stainless steel, the spiral flow guide tube (403) is arranged in the upper cavity of the atomization chamber (402), and the spiral flow guide tube (403) is located within the action range of the atomization generator (401); The porous baffle (404) is arranged in the lower half of the atomization chamber (402), and circular holes with a size of 10-50 micrometers are arranged in a matrix on the porous baffle (404).

3. The automatic liquid injection device for battery production according to claim 1, characterized in that: The liquid injection unit (2) comprises a liquid injection nozzle (201) and an adjustment component (3); the liquid injection nozzle (201) is made of corrosion-resistant stainless steel and is cylindrical in shape as a whole; the liquid injection nozzle (201) is connected to the atomization unit (4) via a liquid injection pipe (202); in addition, a multi-layer structure is provided inside the liquid injection nozzle (201), which comprises, from inside to outside, a spiral diversion layer (2011), a guide layer (2012) and a spray hole layer (2013).

4. The automatic liquid injection device for battery production according to claim 3, characterized in that: The regulating assembly (3) comprises a driving motor (301), the driving motor (301) being arranged at the top of the liquid injection mechanism (1), and the output end of the driving motor (301) being drivingly connected to a lifting screw (302), a lifting platform (303) being sleeved on the lifting screw (302), the liquid injection nozzle (201) being installed at the bottom of the lifting platform (303), and a distance sensor (304) being also arranged at the bottom of the lifting platform (303), and in addition, the driving motor (301) and the distance sensor (304) are both electrically connected to a PLC controller (6).

5. The automatic liquid injection device for battery production according to claim 3, characterized in that: The spiral diversion layer (2011) is composed of a continuous spiral groove with a groove depth of 1-2 mm, a width of 2-3 mm, and a pitch of 5-10 mm. The outlet of the spiral diversion layer (2011) is connected to the inlet of the guide layer (2012).

6. The automatic liquid injection device for battery production according to claim 3, characterized in that: The guide layer (2012) is composed of a plurality of radially distributed guide tubes (2014), the number of which can be adjusted between 6 and 12 according to the size and model of the battery, and the inner diameter of the guide tube (2014) is 1 to 1.5 mm and the length is 10 to 15 mm.

7. The automatic liquid injection device for battery production according to claim 3, characterized in that: The spray hole layer (2013) is evenly distributed with a plurality of spray holes (2015) distributed in an annular manner along the circumferential direction of the liquid injection nozzle (201), the spray holes (2015) have a diameter of 0.5-1 mm, and the center angle between adjacent spray holes (2015) is 15°-30°.

8. The automatic liquid injection device for battery production according to claim 1, characterized in that: The injection mechanism (1) is further provided with a limit unit (7), the limit unit (7) comprising an electric telescopic rod (701), the telescopic end of the electric telescopic rod (701) being connected to a limit plate (702), a pressure sensor (703) being provided on the surface of the limit plate (702), and the pressure sensor (703) being electrically connected to the PLC controller (6).

9. The automatic liquid injection device for battery production according to claim 1, characterized in that: The liquid injection mechanism (1) is arranged on a conveyor belt (8), a material distribution unit (9) is arranged at one end of the conveyor belt (8), a photoelectric sensor (10) is arranged between the material distribution unit (9) and the liquid injection mechanism (1), and the photoelectric sensor (10) is electrically connected to a PLC controller (6).

10. The automatic liquid injection device for battery production according to claim 9, characterized in that: The material distribution unit (9) comprises a material distribution cylinder (901), to which two material distribution telescopic rods (902) are connected, the spacing between the two material distribution telescopic rods (902) being the same as the size of the battery to be injected, and the two material distribution telescopic rods (902) are synchronously staggered and telescopic.

Images