Lithium battery liquid injection hole cleaning gun head

Abstract

The embodiment of the utility model provides a kind of lithium battery liquid injection hole cleaning gun head, it is related to lithium battery cleaning technical field.Lithium battery liquid injection hole cleaning gun head includes gun head main part, plug core, inner layer sleeve and outer layer sleeve.Plug core is set in the central part of gun head main part.Inner layer sleeve is set around plug core, and it is communicated with the cleaning supply device of gun head main part, for injecting cleaning fluid into inner layer sleeve.Outer layer sleeve is set around inner layer sleeve, and it is communicated with the waste liquid recovery device of gun head main part, for recovering waste liquid after cleaning.The utility model can effectively clean the step structure of liquid injection hole, remove the electrolyte residue of plane and vertical surface.The gun head is simple in structure, low in manufacturing cost, convenient to use, and can avoid secondary pollution through waste liquid recovery, improve cleaning effect, reduce equipment cost, guarantee subsequent sealing nail welding yield and long-term sealing of battery cell.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery cleaning technology, and more specifically, to a cleaning gun head for lithium battery injection holes. Background Technology

[0002] In lithium battery manufacturing, after the cell is injected or formed, the residual electrolyte around the injection hole will form crystals. These crystals will volatilize when heated during subsequent laser welding of the sealing nails, generating gas and causing defects such as porosity and bursts in the weld, which seriously endangers the sealing performance and production yield of the cell.

[0003] Currently, common cleaning technologies include laser cleaning, dry ice cleaning, and manual cleaning. Laser cleaning is difficult to effectively clean the vertical surfaces of the injection hole steps, easily leading to residue. Green laser equipment is expensive, while cheaper red lasers can easily damage pre-installed adhesive pins. Dry ice cleaning systems are complex and have high operating costs, requiring specialized training and additional ventilation. Manual cleaning is inefficient and inconsistent, failing to meet mass production requirements. Therefore, existing cleaning technologies cannot simultaneously guarantee cleaning effectiveness while maintaining low cost and high efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a cleaning gun head for lithium battery injection holes, which can effectively clean the stepped structure of the injection hole and remove electrolyte residues on the plane and vertical surfaces. The gun head has a simple structure, low manufacturing cost, and is easy to use. It can also avoid secondary pollution through waste liquid recycling, improve the cleaning effect, reduce equipment costs, and ensure the yield of subsequent sealing nail welding and the long-term sealing performance of the battery cell.

[0005] The embodiments of this utility model can be implemented as follows: This utility model provides a cleaning nozzle for lithium battery filling holes, comprising: Gun head body; A plug is provided at the center of the gun head body; An inner sleeve surrounds the plug and is connected to the cleaning fluid supply device of the nozzle body. An outer sleeve surrounds the inner sleeve and is connected to a waste liquid recovery device of the nozzle body for recovering waste liquid after cleaning.

[0006] In an optional embodiment, the outer diameter of the end of the plug away from the nozzle body is larger than the inner diameter of the injection hole.

[0007] In an optional embodiment, the outer diameter of the end of the plug away from the nozzle body is smaller than the diameter of the lower plane of the injection hole step.

[0008] In an optional embodiment, the diameter of the end of the inner sleeve away from the nozzle body is larger than the diameter of the upper plane of the injection hole step.

[0009] In an optional embodiment, the end of the outer sleeve away from the gun head body extends beyond the end of the inner sleeve away from the gun head body.

[0010] In an optional embodiment, the end of the plug is hemispherical, conical, or planar.

[0011] In an optional embodiment, a seal is provided at the end of the outer sleeve away from the gun head body.

[0012] In an optional embodiment, the plug includes a plug body and a plug connector, the plug connector being connected between the nozzle body and the plug body, and the plug connector being detachably connected to the plug body.

[0013] In an optional embodiment, the gun head body is further provided with a driving component, which is used to drive the plug core to extend and retract relative to the gun head body.

[0014] In an optional embodiment, the plug is made of a corrosion-resistant elastic material.

[0015] The beneficial effects of the lithium battery filling hole cleaning gun head provided in this embodiment of the utility model include: This utility model's lithium battery electrolyte filling hole cleaning gun head features a central plug that seals the filling hole, preventing cleaning fluid or contaminants from entering the battery cell. The surrounding inner sleeve guides and flushes the filling hole steps and their vertical surfaces, solving the problem of incomplete cleaning of such complex structures by existing laser cleaning methods. The outermost sleeve allows for immediate waste fluid recovery, avoiding secondary pollution during the cleaning process. The integrated design results in a simple gun head structure, low manufacturing cost, and convenient operation. While improving the cleaning effect on electrolyte crystallization, it reduces equipment costs, provides reliable assurance for subsequent laser welding of sealing nails, reduces welding porosity and burst points caused by electrolyte residue, and improves the yield of high-quality battery cells. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the lithium battery filling hole cleaning gun head provided in this embodiment.

[0018] Icons: 100 - Lithium battery filling hole cleaning nozzle; 10 - Plug; 20 - Inner sleeve; 30 - Outer sleeve; 200 - Top cover; 201 - Filling hole; 202 - Lower plane; 203 - Upper plane; 204 - Side. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] The following describes in detail the overall structure, working principle, and technical effects of the lithium battery filling hole cleaning gun head provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1The lithium battery injection hole cleaning gun head 100 provided by this utility model is applied to the cleaning process of lithium battery cells after the completion of the injection and formation process and before the laser welding of the sealing nails. It removes the residual electrolyte crystals on the injection hole 201 and its step surface of the battery cell to ensure the quality of subsequent sealing nail welding.

[0027] This lithium battery filling port cleaning nozzle 100 includes a nozzle body (not shown), a plug 10, an inner sleeve 20, and an outer sleeve 30. The plug 10 is located at the center of the nozzle body. The inner sleeve 20 surrounds the plug 10 and is connected to a cleaning supply device (not shown) of the nozzle body for injecting cleaning fluid into the inner sleeve 20. The outer sleeve 30 surrounds the inner sleeve 20 and is connected to a waste liquid recovery device (not shown) of the nozzle body for recovering waste liquid after cleaning. Specifically, the nozzle body provides an installation base and structural support for the plug 10, the inner sleeve 20, and the outer sleeve 30. Internally, it integrates mutually isolated cleaning channels (not shown) and recovery channels (not shown). The cleaning channels are connected to the inner sleeve 20 to introduce cleaning fluid, and the recovery channels are connected to the outer sleeve 30 to discharge waste liquid. Specifically, the cleaning supply device introduces cleaning fluid into the inner sleeve 20 through the cleaning channel, and the waste liquid after cleaning flows out from the gap between the outer sleeve 30 and the inner sleeve 20 and flows into the waste liquid recovery device through the recovery channel.

[0028] By setting up mutually isolated cleaning and recycling channels, the directional spraying of cleaning fluid and the instantaneous recycling of waste liquid can be carried out simultaneously. Setting the plug 10 to block the battery cell injection hole 201 can effectively prevent the cleaning fluid from entering the battery cell and also prevent secondary pollution caused by waste liquid overflow.

[0029] Specifically, the outer diameter of the end of the plug 10 furthest from the gun head body is larger than the inner diameter of the injection hole 201, which can reliably seal the injection hole 201, effectively preventing liquid or contaminants from entering the cell during the cleaning process, thus ensuring the safety of the cell and the reliability of the cleaning operation.

[0030] Furthermore, the outer diameter of the end of the plug 10 furthest from the nozzle body is smaller than the diameter of the lower plane 202 of the injection hole 201 step. It is understood that the injection hole 201 is located on the top cover 200 of the battery cell. The top cover 200 has a recessed stepped structure. This stepped structure includes an upper plane 203 with a larger diameter located above and a lower plane 202 with a smaller diameter located below; that is, the side 204 of the stepped structure is an inclined plane, and the injection hole 201 penetrates through the lower plane 202. By setting the outer diameter of the distal end of the plug 10 to be smaller than the diameter of the lower plane 202 of the injection hole 201 step, it can be ensured that the plug 10 can pass through the stepped structure without interference during the sealing process of being pressed into the injection hole 201. This achieves precise alignment and effective sealing between the plug 10 and the inner wall of the injection hole 201, avoiding sealing failure or damage to the plug 10 due to dimensional interference.

[0031] Furthermore, the diameter of the end of the inner sleeve 20 furthest from the nozzle body is larger than the diameter of the upper plane 203 of the injection hole 201 step. By setting the inner sleeve 20 to this size, it can be ensured that during the cleaning process, the cleaning fluid sprayed from the inner sleeve 20 can completely cover and flush the upper plane 203, lower plane 202, and the side 204 connecting the two of the injection hole 201 step, thereby achieving all-round, no-dead-angle cleaning of the injection hole 201 step structure, thoroughly removing electrolyte crystals remaining in this complex geometry, and facilitating subsequent sealing nail welding.

[0032] In this embodiment, the stepped structure includes an upper plane 203 with a larger diameter located above and a lower plane 202 with a smaller diameter located below, and the side surface 204 of the stepped structure is an inclined plane. In other embodiments, the diameter of the upper plane 203 of the stepped structure can be equal to the diameter of the lower plane 202, and the side surface 204 of the stepped structure is set as a plane perpendicular to the upper plane 203 and the lower plane 202. It is understood that the cleaning gun head provided by this utility model can adapt to and clean stepped structures with different geometric shapes, and has good versatility and reliability.

[0033] To achieve waste liquid recycling, the end of the outer sleeve 30 furthest from the nozzle body extends beyond the end of the inner sleeve 20 furthest from the nozzle body. Specifically, in this embodiment, the axial length of the outer sleeve 30 is greater than the axial length of the inner sleeve 20. By setting a double-sleeve structure with a difference in axial length, the end of the outer sleeve 30 can contact the top cover 200 of the battery cell, while a gap is formed between the inner sleeve 20 and the top cover 200 of the battery cell. This allows the cleaning fluid in the inner sleeve 20 to enter the channel between the inner sleeve 20 and the outer sleeve 30 through this gap after cleaning the battery cell injection hole 201, and then be efficiently drawn in and discharged under negative pressure. This ensures that the contaminated cleaning fluid is recycled immediately and in a targeted manner after use, effectively avoiding the residue or splashing of waste liquid on the surface of the battery cell, achieving clean and closed-loop management of the cleaning process, and eliminating the risk of secondary pollution.

[0034] Optionally, the end of the plug 10 can be hemispherical, conical, or planar. In this embodiment, the end of the plug 10 can be configured in different shapes according to actual needs. Specifically, a hemispherical end facilitates guidance and centering, helping the plug 10 to smoothly enter the injection hole 201 and reducing uneven wear; a conical end has stronger wedging and centering capabilities, making it particularly suitable for scenarios with high initial sealing requirements; and a planar end provides the largest contact area, contributing to a stable and uniform seal. The cleaning gun head of this invention has adaptability and flexibility, enabling it to maintain reliable sealing performance in diverse production environments.

[0035] Furthermore, to prevent leakage of waste liquid after cleaning, a seal (not shown) is provided at the end of the outer sleeve 30 away from the main body of the cleaning nozzle. Specifically, the seal can be an annular sealing ring or a flexible lip structure made of materials such as rubber or silicone. When the cleaning nozzle approaches the battery cell, the seal will make elastic contact with the surface of the battery cell top cover 200 before the outer sleeve 30 and produce a slight deformation, thereby ensuring that a relatively closed negative pressure recovery chamber is maintained during the cleaning process.

[0036] In some implementations, the plug 10 and the gun head body can also be configured as a detachable structure. Specifically, the plug 10 includes a plug body and a plug connector. The plug connector is connected between the gun head body and the plug body. The plug connector is detachably connected to the plug body. By setting a modular detachable structure, quick replacement and convenient maintenance of the plug body can be achieved. Specifically, the detachable connection can be configured as a threaded connection, a snap-fit ​​connection, or a quick-connect fitting connection. When the plug body wears or ages due to long-term use or needs to be replaced due to cleaning different specifications of battery cells, the operator does not need to replace the entire gun head; they only need to remove the plug body from the plug connector and replace it with a new one.

[0037] In another embodiment, the plug 10 and the nozzle body can also be configured as a telescopic structure. Specifically, the nozzle body is also provided with a driving component. The driving component is used to drive the plug 10 to extend and retract relative to the nozzle body. By setting an actively controllable telescopic structure, precise docking and separation of the plug 10 and the injection hole 201 can be achieved during the cleaning process. In particular, when the outer sleeve 30 abuts against the top cover 200 of the battery cell, the plug 10 still does not contact the injection hole 201. By setting the plug 10 as a telescopic structure, it can adapt to the depth differences of the stepped structure of the injection hole 201 in different battery cell models. Specifically, the driving component can preferably be a pneumatic cylinder, a hydraulic cylinder, or a linear motor. At the start of cleaning, the driving component pushes the plug 10 out and presses against the injection hole 201 to form a reliable seal; after cleaning, the driving component drives the plug 10 to retract and detach from the surface of the battery cell.

[0038] To improve the durability and sealing effect of the plug 10, the plug 10 is made of a corrosion-resistant elastic material. Specifically, the plug 10 can be made of materials such as silicone, rubber, or fluororubber. The plug 10 can undergo controllable elastic deformation when in contact with the top cover 200 of the battery cell, which ensures a tight fit with the metal wall while avoiding scratches that may be caused by excessively hard materials.

[0039] The beneficial effects of the lithium battery filling hole cleaning gun head 100 provided in this embodiment of the utility model include: The lithium battery electrolyte filling hole cleaning nozzle 100 of this invention seals the filling hole 201 with a central plug 10, preventing cleaning fluid or contaminants from entering the battery cell. The surrounding inner sleeve 20 guides and flushes the steps and vertical surfaces of the filling hole 201, solving the problem of incomplete cleaning of such complex structures by existing laser cleaning methods. The outermost outer sleeve 30 can immediately recover waste liquid, avoiding secondary pollution during the cleaning process. The integrated design makes the nozzle simple in structure, low in manufacturing cost, and easy to operate. While improving the cleaning effect on electrolyte crystallization, it reduces equipment costs, provides a reliable guarantee for subsequent laser welding of sealing nails, reduces welding porosity and burst points caused by electrolyte residue, and improves the yield of high-quality battery cells.

[0040] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A cleaning nozzle (100) for a lithium battery filling hole, characterized in that, include: Gun head body; A plug (10) is disposed at the center of the gun head body; Inner sleeve (20), the inner sleeve (20) is arranged around the plug (10) and is connected to the cleaning fluid supply device of the gun head body; An outer sleeve (30) surrounds the inner sleeve (20) and is connected to the waste liquid recovery device of the gun head body for recovering the waste liquid after cleaning.

2. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The outer diameter of the end of the plug (10) away from the main body of the nozzle is larger than the inner diameter of the injection hole (201).

3. The lithium battery filling hole cleaning nozzle (100) according to claim 2, characterized in that, The outer diameter of the end of the plug (10) away from the main body of the nozzle is smaller than the diameter of the lower plane (202) of the injection hole (201) step.

4. The lithium battery filling hole cleaning nozzle (100) according to claim 2, characterized in that, The diameter of the end of the inner sleeve (20) away from the main body of the nozzle is greater than the diameter of the upper plane (203) of the injection hole (201) step.

5. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The end of the outer sleeve (30) away from the gun head body extends beyond the end of the inner sleeve (20) away from the gun head body.

6. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The end of the plug (10) is hemispherical, conical or planar.

7. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The outer sleeve (30) is provided with a seal at the end away from the gun head body.

8. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The plug (10) includes a plug body and a plug connector. The plug connector is connected between the gun head body and the plug body, and the plug connector is detachably connected to the plug body.

9. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The gun head body is also provided with a driving component, which is used to drive the plug (10) to extend and retract relative to the gun head body.

10. The lithium battery filling hole cleaning nozzle (100) according to claim 1, characterized in that, The plug (10) is made of a corrosion-resistant elastic material.

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