Battery liquid injection hole cleaning device

Abstract

The utility model relates to battery technical field provides a kind of battery liquid injection hole cleaning device, including brush assembly, it includes bristle and heating part, bristle is opened with through-hole along axis, heating part is embedded in the through-hole, heating part is used to heat bristle, first driving part is used to drive brush assembly rotates around its own axis to clean liquid injection hole by bristle, the utility model makes it difficult for cleaning solvent to solidify on brush by heating part, can effectively solve brush solidification problem, ensure that bristle always keep soft activity, cooperate first driving part and drive brush assembly rotation, can continuously and efficiently remove the impurity of liquid injection hole welding area, improve cleaning effect and practical life, to guarantee the cleanliness of liquid injection hole cleaning, the heat of heating part can also assist the evaporation of residual small amount of solvent in liquid injection hole, reduce the possibility of solvent causing fire accident in subsequent high-temperature process, while reducing the hidden danger of residual solvent leading to internal short circuit of battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery filling hole cleaning device. Background Technology

[0002] Currently, the requirements for lithium-ion batteries are becoming increasingly stringent, demanding long driving ranges and low prices. Therefore, to meet these diverse needs, lithium battery manufacturers are focusing on improving energy density and product yield to enhance battery range and reduce costs. The sealing and welding process is one of the key steps in lithium battery manufacturing; poor sealing and welding can directly lead to battery failure. The cleanliness of the injection hole is a crucial factor directly affecting the quality of the sealing and welding; improving the cleanliness of the area near the injection hole welding area effectively increases the yield rate of the sealing and welding process.

[0003] Currently, the production line uses automation to clean the welding area of ​​the injection hole by spraying cleaning solvent and then wiping it with a brush. However, the brush will continuously absorb and accumulate cleaning solvent during the wiping process. As the operation time increases, the accumulated solvent will gradually solidify on the brush fibers, resulting in a significant decrease in the cleaning ability of the brush. It cannot effectively remove impurities from the welding area of ​​the injection hole, causing incomplete cleaning. This will affect the quality of subsequent sealing welding and increase the risk of battery scrapping. On the other hand, the solvent solidified on the brush and the residual solvent that has not been completely removed can easily cause fire accidents if they come into contact with high-temperature environments or metal parts inside the battery cell during subsequent production processes. At the same time, the residual solvent may also cause short circuit faults inside the battery cell, further aggravating the scrapping of batteries and posing serious hidden dangers to the safety and stability of lithium battery production. Utility Model Content

[0004] The purpose of this invention is to provide a battery filling hole cleaning device to solve the problems in the prior art. It can solve the problem of brush hardening during battery filling hole cleaning. It is suitable for the pretreatment process of laser sealing with high cleanliness of battery filling holes, and avoids the problem of explosion points caused by unclean surface cleaning during the laser sealing process of batteries. It can effectively improve the sealing yield.

[0005] This utility model provides a battery filling hole cleaning device, comprising: A conveyor belt is used to carry and transport batteries along a preset path. The side of the battery facing away from the conveyor belt has an injection hole. A brush assembly is suspended above the conveyor belt corresponding to the liquid injection hole, and is used to wipe and clean the liquid injection hole of the passing battery. The brush assembly includes bristles and a heating element. The bristles have through holes along the axis, and the heating element is embedded in the through holes. The heating element is used to heat the bristles. A first driving member is used to drive the brush assembly to rotate about its own axis to clean the injection hole through the bristles.

[0006] In the battery filling hole cleaning device described above, preferably, the base of the brush bristles is provided with a circuit board, the heating element includes a metal wire, the metal wire is folded in half and housed in the through hole, with the bent end of the metal wire facing the conveyor belt, the two movable ends of the metal wire extend out of the through hole and form an electrical connection with the circuit board, and the metal wire can be heated by the power supply of the circuit board.

[0007] In the battery filling hole cleaning device described above, preferably, the circuit board is provided with a positive terminal hole and a negative terminal hole, and the two movable ends of the metal wire are respectively connected to the positive terminal hole and the negative terminal hole to form a power supply circuit.

[0008] In the battery filling hole cleaning device described above, preferably, the metal wire includes any one of silver wire, copper wire, or aluminum wire.

[0009] In the battery filling hole cleaning device described above, preferably, the brush assembly is further provided with a temperature sensor, the output end of which is electrically connected to the input end of the heating element, and the temperature sensor is used to detect and control the opening or closing of the heating element.

[0010] In a battery filling hole cleaning device as described above, preferably, the cleaning device further includes a second driving member for driving the brush assembly to move relative to the filling hole.

[0011] The battery filling hole cleaning device described above, preferably, further includes a spraying assembly disposed in front of the brush assembly along the conveying direction of the conveyor belt, the spraying assembly including a first directional shaft, a fixing clamp, and a liquid suction pipe, wherein: The first directional shaft is a hollow rod-shaped structure and extends in a horizontal direction perpendicular to the conveyor belt's conveying direction; The fixing clamp is used to fix the first directional shaft at a preset position on the conveyor belt; The liquid suction pipe is inserted into the hollow interior of the first directional shaft. One end of the pipe extends along the first directional shaft to the side near the conveyor belt, and the other end extends away from the conveyor belt to connect to an external liquid supply mechanism. The end of the liquid suction pipe near the conveyor belt is provided with a solvent nozzle, and the nozzle of the solvent nozzle faces the liquid injection hole.

[0012] In the battery filling hole cleaning device described above, preferably, the external liquid supply mechanism includes a solvent tank and a liquid suction pump, the liquid suction pump is located inside the solvent tank, and the liquid suction pipe is connected to the liquid suction pump.

[0013] In the battery filling hole cleaning device described above, preferably, the cleaning device further includes a blower assembly disposed at the rear end of the brush assembly along the conveyor belt conveying direction. The blower assembly includes a second directional shaft and an air suction pipe. The second directional shaft is a hollow rod-shaped structure and is suspended on the conveyor belt corresponding to the filling hole. The air suction pipe is disposed inside the hollow part of the second directional shaft. One end of the air suction pipe facing the filling hole is provided with an air nozzle, and the other end is connected to an external air pressure device.

[0014] In the battery filling hole cleaning device described above, preferably, the cleaning device further includes a cleaning component disposed at the rear end of the blower assembly along the conveyor belt conveying direction. The cleaning component includes a cleaning brush and a fixing frame. The cleaning brush is suspended on the conveyor belt corresponding to the filling hole. The fixing frame is used to fix the cleaning brush at a preset position on the conveyor belt. When the battery passes by the cleaning brush, the cleaning brush brushes across the filling hole, sweeping away any foreign matter remaining after blowing away from the filling hole.

[0015] Compared with existing technologies, this invention uses a heating element to prevent the cleaning solvent from solidifying on the brush, effectively solving the problem of brush solidification and ensuring that the bristles remain soft and active. Combined with the first driving component that drives the brush assembly to rotate, it can continuously and efficiently remove impurities from the welding area of ​​the injection hole, improving cleaning effectiveness and service life. This ensures the cleanliness of the injection hole cleaning, thereby guaranteeing the quality of subsequent sealing welding and significantly reducing the risk of battery failure. Furthermore, the heat from the heating element not only prevents the solvent on the brush from solidifying but also helps to evaporate any remaining small amount of solvent in the injection hole, reducing the possibility of solvent-induced fires during subsequent high-temperature processes. It also reduces the risk of residual solvent causing short circuits within the battery cell, providing a reliable guarantee for the safety and stability of lithium battery production. Attached Figure Description

[0016] Figure 1 This is a perspective view of the battery filling hole cleaning device provided in an embodiment of the present invention; Figure 2 This is an enlarged view of the brush assembly and the first driving component provided in an embodiment of the present invention; Figure 3 This is a perspective view of the brush bristles provided in an embodiment of this utility model; Figure 4 This is a perspective view of the brush assembly provided in an embodiment of the present invention; Figure 5This is an enlarged view of the spraying assembly provided in an embodiment of this utility model; Figure 6 This is an enlarged view of the blower assembly provided in an embodiment of this utility model; Figure 7 This is an enlarged view of the cleaning component provided in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 10. Brush assembly; 11. Brush bristles; 110. Through hole; 12. Heating element; 13. First driving component; 14. Circuit board; 140. Positive terminal; 141. Negative terminal; 15. Temperature sensor; 16. Second driving component; 20. Spraying assembly; 21. First orientation axis; 22. Fixing clamp; 23. Liquid suction pipe; 24. Solvent nozzle; 25. Solvent tank; 26. Liquid suction pump; 30. Air blowing assembly; 31. Second directional shaft; 32. Intake duct; 33. Air blowing nozzle; 40. Sweeping assembly; 41. Sweeping brush; 42. Mounting bracket; 50. Conveyor belt; 51. Battery; 52. Liquid injection port. Detailed Implementation

[0018] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] See Figure 1-4 As shown, this embodiment provides a battery filling hole cleaning device, including a conveyor belt 50, a brush assembly 10, and a first drive unit 13, wherein: A conveyor belt 50 carries and transports batteries 51 along a preset path. Each battery 51 has an injection hole 52 on the side facing away from the conveyor belt 50. A brush assembly 10 is suspended above the conveyor belt 50 corresponding to the injection hole 52, used to wipe and clean the injection holes 52 of the passing batteries 51. The brush assembly 10 includes bristles 11 and a heating element 12. The bristles 11 have through holes 110 along their axis, and the heating element 12 is embedded in the through holes 110, used to heat the bristles 11. A first driving member 13 drives the brush assembly 10 to rotate around its own axis to clean the injection holes 52 through the bristles 11. In the embodiments provided in this application, the cleaning solvents are all commonly used solvents in electrolytes. The cleaning process does not introduce materials detrimental to the performance of the battery 51, and the solvents are low-cost and easy to manufacture. Each bristle 11 has a heating element 12 embedded in its through hole 110. The heating element 12 can evenly transfer heat to the bristle fibers. When the cleaning solvent adsorbed by the bristles 11 solidifies or is about to solidify due to prolonged operation, the heat from the heating element 12 can melt the solidified material in time, maintaining the softness and cleaning activity of the bristle fibers. This avoids the cleaning solvent from clumping and reducing its cleaning ability, as well as the problem of clumping scratching the injection hole 52 or impurities being pressed into the hole. In addition, the heating element 12 can not only prevent the solvent on the brush from solidifying, but also help evaporate the small amount of solvent remaining in the injection hole 52, reducing the possibility of solvent causing fire accidents in subsequent high-temperature processes.

[0020] The first driving component 13 can be a rotary motor, and the brush assembly 10 is located at the output end of the rotary motor. The first driving component 13 drives the brush assembly 10 to rotate around the axis. The rotating bristles 11 can wipe and clean the inner wall of the injection hole 52 and the welding area, as well as impurities such as welding slag and dust. The heated bristles 11 are more likely to conform to the irregular curved surface of the injection hole 52, eliminate cleaning dead corners, ensure the cleanliness of the welding area of ​​the injection hole 52, provide a stable foundation for subsequent sealing welding, and reduce the risk of battery 51 being scrapped.

[0021] In some embodiments of this application, the heating element 12 includes a metal wire, and a circuit board 14 is provided at the root of the bristles 11. The metal wire is folded in half and housed within a through hole 110, with the bent end of the metal wire facing the conveyor belt 50. The two movable ends of the metal wire extend out of the through hole 110 and form an electrical connection with the circuit board 14, allowing the metal wire to heat up when powered by the circuit board 14. The folded metal wire embedded within the through hole 110 of the bristles 11 results in a short heating path and minimal heat loss, enabling rapid heat transfer to all areas of the bristles 11 and preventing localized solvent coagulation. Simultaneously, the folded structure ensures more uniform heating of the bristles 11, maintaining cleaning activity. Furthermore, the metal wire possesses a certain degree of rigidity, enhancing the bristles 11's resistance to bending and extending its service life. The bent end of the metal wire is encased within the bristles 11, preventing contact with the electrolyte and effectively avoiding corrosion by the electrolyte.

[0022] See Figure 4 As shown, in this embodiment, the circuit board 14 is provided with a positive terminal 140 and a negative terminal 141. The two movable ends of the metal wire are respectively connected to the positive terminal 140 and the negative terminal 141 to form a power supply circuit. The two movable ends of the metal wire are connected to the circuit board 14. Specifically, one end of each metal wire is connected in series to the positive terminal 140, and the other end is connected in series to the negative terminal 141 to achieve power supply. This series-connected centralized wiring method eliminates the need to set separate positive and negative interfaces for each metal wire, simplifies the structural design of the circuit board 14 and the assembly process of the metal wire, reduces the risk of wiring errors and poor contact, and also facilitates the unified control of circuit on / off and heating status. It should be noted that the roots of all the bristles 11 in the brush assembly 10 are integrated into a bristle holder, and the circuit board 14 is set on the bristle holder to form an integral module. In this embodiment, the metal wire includes any one of silver wire, copper wire, or aluminum wire.

[0023] See Figure 4 As shown, the brush assembly 10 is further equipped with a temperature sensor 15. The output terminal of the temperature sensor 15 is electrically connected to the input terminal of the heating element 12. The temperature sensor 15 is used to detect and control the heating element 12 to turn on or off. The temperature sensor 15 senses the temperature near the bristles 11 in real time. When the temperature drops to the freezing point of the cleaning solvent, it controls the heating element 12 to turn on and heat the bristles 11. When the temperature reaches a certain level, it controls the heating element 12 to turn off to prevent the bristles 11 from softening due to excessive temperature.

[0024] Specifically, the temperature sensor 15 can be mounted on the circuit board 14, close to the heat-conducting area of ​​the metal wire or its vicinity. It converts the physical temperature of the metal wire into an electrical signal, which is transmitted to the control unit of the circuit board 14. The output terminal of the temperature sensor 15 is electrically connected to the input terminal of the circuit board 14, and the output terminal of the circuit board 14 is electrically connected to the input terminal of the metal wire. According to the data, the solidification point of the cleaning solvent is 4°C. To prevent the bristles 11 from clumping together due to solvent solidification, the power supply temperature of the temperature sensor 15 can be set to 10°C. When the temperature sensor 15 detects that the temperature of the metal wire is below 10°C, the power is activated, and the circuit board 14 conducts electricity to the metal wire, heating it to melt the solidified cleaning solvent. When the detected temperature of the metal wire exceeds 15°C, the power is turned off to prevent the excessively high temperature of the metal wire from affecting the bristles 11. It should be noted that the threshold setting of the temperature sensor 15 and its circuit connection with the circuit board 14 are existing technologies and will not be elaborated upon here.

[0025] See Figure 2As shown, in one feasible embodiment, the cleaning device further includes a second drive member 16 for driving the brush assembly 10 to move relative to the injection hole 52. The second drive member 16 may be a cylinder, and the first drive member 13 and the brush assembly 10 form an integral module. The second drive member 16 drives the entire module to move, realizing rotational cleaning and positional movement or angle change. When the battery 51 moves below the brush assembly 10, the second drive member 16 drives the brush assembly 10 to move until the bristles 11 contact the inner wall or surface of the injection hole 52. Then, the output end of the first drive member 13 drives the brush assembly 10 to rotate and clean the injection hole 52. After cleaning is completed, the second drive member 16 drives the brush assembly 10 away from the injection hole 52, and the battery 51 continues to be conveyed downward along the conveyor belt 50.

[0026] See Figure 1 and Figure 5 As shown, in some embodiments of this application, the cleaning device further includes a spraying assembly 20 disposed in front of the brush assembly 10 along the conveying direction of the conveyor belt 50. The spraying assembly 20 includes a first directional shaft 21, a fixing clamp 22, and a liquid suction pipe 23. The first directional shaft 21 is a hollow rod-shaped structure and extends in a horizontal direction perpendicular to the conveying direction of the conveyor belt 50. The fixing clamp 22 is used to fix the first directional shaft 21 at a preset position on the conveyor belt 50. The liquid suction pipe 23 passes through the hollow interior of the first directional shaft 21, with one end extending along the first directional shaft 21 to the side near the conveyor belt 50 and the other end extending away from the conveyor belt 50 to connect to an external liquid supply mechanism. The end of the liquid suction pipe 23 near the conveyor belt 50 is provided with a solvent nozzle 24, and the spray nozzle 24 faces the injection hole 52. The spraying assembly 20 is used to spray cleaning solvent onto the injection hole 52 before the brush assembly 10 cleans it. The suction pipe 23 passes through the hollow interior of the first directional shaft 21. The first directional shaft 21 provides rigid support for the suction pipe 23, preventing it from bending or shaking due to its own weight or equipment vibration. This ensures a stable spray angle of the solvent nozzle 24 and prevents it from splashing onto the non-clean areas of the battery 51. The spraying assembly 20 is spaced a certain distance from the brush assembly 10. The cleaning solvent can pre-wet the impurities in the injection hole 52, softening and loosening them, thus preparing for stable wetting for subsequent brush rotation and wiping.

[0027] See Figure 5 As shown, the external liquid supply mechanism further includes a solvent tank 25 and a suction pump 26. The suction pump 26 is located inside the solvent tank 25, and the suction pipe 23 is connected to the suction pump 26. The suction pump 26 can quickly and quantitatively draw up the cleaning solvent.

[0028] See Figure 1 and Figure 6As shown, in order to reduce the risk of internal short circuits caused by residual solvents, in some embodiments of this application, the cleaning device further includes a blower assembly 30 located at the rear end of the brush assembly 10 along the conveying direction of the conveyor belt 50. The blower assembly 30 includes a second directional shaft 31 and an air intake pipe 32. The second directional shaft 31 is a hollow rod-shaped structure and is suspended on the conveyor belt 50 corresponding to the liquid injection hole 52. The air intake pipe 32 is located inside the hollow part of the second directional shaft 31. One end of the air intake pipe 32 facing the liquid injection hole 52 is provided with an air nozzle 33, and the other end is connected to an external air pressure device (not shown in the figure). The air nozzle 33 is aligned with the liquid injection hole 52. With the stable support of the second directional shaft 31, it can quickly dry the cleaning solvent remaining in the hole and at the hole opening, avoiding the solvent residue from affecting subsequent processes or causing short circuit faults inside the battery cell. The air intake pipe 32 is located inside the hollow second directional shaft 31, which not only prevents the air intake pipe 32 from shaking and shifting, but also allows for flexible adjustment of its position to adapt to the liquid injection holes 52 of different battery specifications, without occupying too much production line space.

[0029] See Figure 1 and Figure 7 As shown, for the small foreign objects that remain after blowing, such as powder and lint left by solvent evaporation, the cleaning device also includes a cleaning component 40 located at the rear end of the blowing component 30 along the conveying direction of the conveyor belt 50. The cleaning component 40 includes a cleaning brush 41 and a fixing frame 42. The cleaning brush 41 is suspended on the conveyor belt 50 corresponding to the liquid injection hole 52. The fixing frame 42 is used to fix the cleaning brush 41 at a preset position on the conveyor belt 50. When the battery 51 passes the cleaning brush 41, the cleaning brush 41 brushes over the liquid injection hole 52, sweeping away the foreign objects remaining after blowing away from the liquid injection hole 52. The cleaning brush 41 thoroughly sweeps away debris, avoiding cleaning dead corners and further improving the cleanliness of the liquid injection hole 52. The cleaning end of the cleaning brush 41 makes slight contact with the liquid injection hole 52. As the battery 51 moves, the liquid injection hole 52 passes through the cleaning end of the cleaning brush 41. The cleaning brush 41 contacts the liquid injection hole 52 by sweeping rather than scrubbing, which can remove foreign objects and avoid scratching the hole wall. In addition, the cleaning brush 41 is installed in a preset position by the fixing bracket 42. The height of the cleaning brush 41 on the fixing bracket 42 can be adjusted to flexibly adapt to the cleaning needs of batteries 51 with different thicknesses.

[0030] Based on the above embodiments, the working principle of the battery injection hole cleaning device of the present invention is as follows: the battery 51 to be cleaned is placed on the conveyor belt 50. When the battery 51 passes under the solvent nozzle 24, the suction pump 26 draws the cleaning solvent in the solvent tank 25 and sends it to the solvent nozzle 24 through the suction pipe 23 to spray it on the surface of the injection hole 52. Battery 51 flows to the bottom of brush assembly 10 via conveyor belt 50. Second drive unit 16 drives brush assembly 10 to approach battery 51 until brush bristles 11 contact liquid injection hole 52. Under the action of first drive unit 13, brush bristles 11 clean battery 51. The brush bristles 11 are coated with cleaning solvent. Temperature sensor 15 detects the temperature near brush bristles 11. When the preset low temperature is reached, the power is turned on. The metal wire conducts heat after being energized, causing the solidified cleaning solvent to melt after being heated. When the metal wire reaches the preset high temperature, the temperature sensor 15 will control the power to be turned off to prevent the brush from being damaged by excessive temperature. When the battery 51 passes through the blower nozzle, the air intake pipe 32 blows gas out of the blower nozzle through the air pressure device to dry the battery 51. As the battery 51 continues to move, when it passes the cleaning assembly 40, the cleaning brush 41 cleans away any foreign objects remaining on the surface of the battery 51.

[0031] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0032] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A battery filling hole cleaning device, characterized in that, include: A conveyor belt is used to carry and transport batteries along a preset path. The side of the battery facing away from the conveyor belt has an injection hole. A brush assembly is suspended above the conveyor belt corresponding to the liquid injection hole, and is used to wipe and clean the liquid injection hole of the passing battery. The brush assembly includes bristles and a heating element. The bristles have through holes along the axis, and the heating element is embedded in the through holes. The heating element is used to heat the bristles. A first driving member is used to drive the brush assembly to rotate about its own axis to clean the injection hole through the bristles.

2. The battery filling hole cleaning device according to claim 1, characterized in that, The base of the bristles is provided with a circuit board. The heating element includes a metal wire, which is folded in half and housed in the through hole with the bent end of the metal wire facing the conveyor belt. The two movable ends of the metal wire extend out of the through hole and form an electrical connection with the circuit board. The metal wire can generate heat when powered by the circuit board.

3. The battery filling hole cleaning device according to claim 2, characterized in that, The circuit board is provided with a positive terminal and a negative terminal. The two movable ends of the metal wire are respectively connected to the positive terminal and the negative terminal to form a power supply circuit.

4. The battery filling hole cleaning device according to claim 2, characterized in that, The metal wire includes any one of silver wire, copper wire, or aluminum wire.

5. The battery filling hole cleaning device according to claim 1, characterized in that, The brush assembly is also equipped with a temperature sensor, the output of which is electrically connected to the input of the heating element. The temperature sensor is used to detect and control the heating element to turn on or off.

6. The battery filling hole cleaning device according to claim 1, characterized in that, The cleaning device also includes a second drive unit for driving the brush assembly to move relative to the injection hole.

7. The battery filling hole cleaning device according to claim 1, characterized in that, The cleaning device further includes a spraying assembly disposed in front of the brush assembly along the conveying direction of the conveyor belt. The spraying assembly includes a first directional shaft, a fixing clamp, and a liquid suction pipe, wherein: The first directional shaft is a hollow rod-shaped structure and extends in a horizontal direction perpendicular to the conveyor belt's conveying direction; The fixing clamp is used to fix the first directional shaft at a preset position on the conveyor belt; The liquid suction pipe is inserted into the hollow interior of the first directional shaft. One end of the pipe extends along the first directional shaft to the side near the conveyor belt, and the other end extends away from the conveyor belt to connect to an external liquid supply mechanism. The end of the liquid suction pipe near the conveyor belt is provided with a solvent nozzle, and the nozzle of the solvent nozzle faces the liquid injection hole.

8. The battery filling hole cleaning device according to claim 7, characterized in that, The external liquid supply mechanism includes a solvent tank and a liquid suction pump. The liquid suction pump is located inside the solvent tank, and the liquid suction pipe is connected to the liquid suction pump.

9. The battery filling hole cleaning device according to claim 1, characterized in that, The cleaning device further includes a blower assembly located at the rear end of the brush assembly along the conveyor belt's conveying direction. The blower assembly includes a second directional shaft and an air intake pipe. The second directional shaft is a hollow rod-shaped structure and is suspended on the conveyor belt corresponding to the injection hole. The air intake pipe is located inside the hollow interior of the second directional shaft. One end of the air intake pipe facing the injection hole is provided with an air nozzle, and the other end is connected to an external air pressure device.

10. The battery filling hole cleaning device according to claim 9, characterized in that, The cleaning device further includes a cleaning component located at the rear end of the blower assembly along the conveyor belt's conveying direction. The cleaning component includes a cleaning brush and a fixing frame. The cleaning brush is suspended on the conveyor belt corresponding to the liquid injection hole. The fixing frame is used to fix the cleaning brush at a preset position on the conveyor belt. When the battery passes by the cleaning brush, the cleaning brush brushes across the liquid injection hole, sweeping away any foreign matter remaining after blowing away from the liquid injection hole.

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