Aluminum shell lithium battery liquid injection equipment
By combining dry ice rinsing and dispersion components, the problem of electrolyte residue during the electrolyte filling process of aluminum-cased lithium batteries is solved, achieving uniform dispersion and automated control of the electrolyte, thus improving filling efficiency and battery performance.
Patent Information
- Application Number
- CN202511577408.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-02-10
AI Technical Summary
During the electrolyte injection process of aluminum-cased lithium batteries, electrolyte tends to accumulate and remain near the injection port, resulting in a lower-than-expected injection volume, which increases production costs and cleaning workload.
Dry ice particles from a dry ice tank are used to rinse the electrolyte filling port of the lithium battery, and the electrolyte is evenly dispersed through a dispersion component and a transmission component. Combined with an intelligent valve control system, the dry ice rinsing and electrolyte filling processes are automatically controlled.
It effectively reduces electrolyte residue, improves electrolyte injection efficiency and battery cleanliness, enhances battery performance, simplifies operation procedures, and reduces manual intervention.
Smart Images
Figure CN121507340A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lithium battery electrolyte filling technology, specifically to an aluminum-cased lithium battery electrolyte filling device. Background Technology
[0002] Aluminum-cased lithium batteries, as a type of high-performance polymer lithium battery, feature a unique structural design—including an aluminum casing, an explosion-proof valve, and a precision stacked or wound structure composed of a cover, positive plate, negative plate, and separator—which not only enhances the safety and durability of the battery but also promotes its widespread application in diverse fields such as LED lighting, power tools, electric vehicles, and energy storage systems.
[0003] In the production process of aluminum-cased lithium batteries, the electrolyte injection machine plays a crucial role. This device integrates an electrolyte storage tank, a high-precision pump, an intelligent positioning device, and an intuitive and easy-to-use control panel, ensuring the efficiency and precision of the electrolyte injection process. In the workflow, the battery is first placed stably on an automated conveyor belt, and then accurately positioned at the injection location by a precise positioning device. At this point, the pump starts, drawing the electrolyte from the storage tank and slowly injecting it into the battery through a precisely designed delivery pipe. Once the preset electrolyte capacity is reached, the pump immediately stops working automatically, and the conveyor belt transports the injected battery to the next process.
[0004] However, given the complex internal component layout of aluminum-cased lithium batteries, the electrolyte injection process is not without challenges. The specific arrangement of the positive electrode plate, negative electrode plate, and separator often affects the flow and penetration of the electrolyte, leading to electrolyte accumulation near the injection port. Furthermore, after injection, due to the combined effects of liquid surface tension and gravity, electrolyte residues tend to form on the outside and surrounding areas of the injection port. These residues are included in the total weight during subsequent weighing, causing the actual injected volume to be lower than expected. This forces workers to perform tedious cleaning, reweighing, and possible secondary injection operations, which undoubtedly increases production and time costs. To address this, we propose an aluminum-cased lithium battery electrolyte injection device. Summary of the Invention
[0005] To address the aforementioned technical problems, this application provides an aluminum-cased lithium battery electrolyte filling device, comprising a main body, a storage tank for storing electrolyte disposed on the main body, a mounting frame disposed on the main body, an electric actuator disposed on the mounting frame, and further comprising: A dry ice container is installed at the end of an electric push rod and contains dry ice. A support is installed on the outside of the dry ice container, and the dry ice container is connected to the electric push rod through the support. The injection tube, mounted on the support and connected to the storage tank via a pump, is used to inject electrolyte into the battery. The transition tank and the cleaning head are provided. The transition tank is located on one side of the injection pipe and is connected to the dry ice tank and the cleaning head. The cleaning head is located on the outside of the injection pipe and is used to rinse the injection port of the lithium battery with dry ice after the injection is completed. The dispersion component, located inside the injection tube, enables the electrolyte injected into the lithium battery to be transported to the outside of the lithium battery during injection. The transmission component is installed inside the injection pipe and is connected to the dispersion component for driving the dispersion component to move and deliver electrolyte.
[0006] Valve body one and valve body two are respectively located between the dry ice tank and the transition tank, and between the transition tank and the cleaning head. A trigger rod is provided on the outside of the injection pipe. When the trigger rod moves, valve body one and valve body two can be opened.
[0007] In some embodiments, the dispersion assembly includes a dispersion head movably disposed at the bottom of the injection tube. The dispersion head is a cylindrical structure with a closed bottom. Multiple through grooves are provided on the outer side of the dispersion head. Multiple elastic bands are fixedly disposed in the through grooves. The width of the elastic bands is the same as the width of the through grooves. A rotating shaft is fixedly connected to the dispersion head.
[0008] In some embodiments, the transmission assembly includes a housing disposed above the injection tube, a transmission shaft rotatably disposed within the housing, the bottom of the transmission shaft penetrating the housing, a plurality of blades disposed on the outer side of the transmission shaft, a spline shaft fixedly connected to the top of the rotating shaft, a spline groove formed at the bottom of the transmission shaft, the spline shaft slidably disposed within the spline groove, a connecting spring disposed within the spline groove, and both ends of the connecting spring being fixedly connected to the interior of the transmission shaft and the spline shaft, respectively.
[0009] In some embodiments, a connecting pipe is provided between the dry ice tank and the transition tank, and the middle section of the connecting pipe is connected to the shell. When dry ice particles pass through the connecting pipe and the shell, the flowing dry ice can drive the blades and the drive shaft to rotate. A cleaning pipe is provided between the transition tank and the cleaning head. Valve body one and valve body two are respectively installed in the connecting pipe and the cleaning pipe.
[0010] In some embodiments, the valve body includes a stop ball rotatably disposed in a connecting pipe, a connecting shaft is fixedly connected to the stop ball, a gear is disposed on the outside of the connecting shaft, and a rack is fixedly disposed at one end of the trigger rod, so that when the trigger rod moves, it can drive the rack to mesh with the gear.
[0011] In some embodiments, the valve body 2 includes a fixed box fixedly disposed on the outside of the cleaning pipe, a baffle ball 2 rotatably disposed inside the cleaning pipe, a connecting shaft 2 fixedly disposed on the baffle ball 2, the end of the connecting shaft 2 extending into the fixed box and having a gear 2 disposed at the end, a rack 2 meshing with the gear 2 disposed inside the fixed box, a friction rod slidably disposed inside the fixed box, a support spring fixedly disposed on the outside of the friction rod, and the bottom of the support spring being connected to the fixed box.
[0012] In some embodiments, a connecting bracket is provided on a trigger rod located below one of the valve bodies, and another trigger rod is fixedly disposed at the end of the connecting bracket.
[0013] In some embodiments, a plurality of rollers are rotatably disposed on the outer side of the trigger rod located below the valve body. The plurality of rollers are rotatably disposed on the trigger rod via one-way bearings. When the trigger rod moves upward and contacts the friction rod, the rollers rotate on the trigger rod. When the trigger rod resets and moves downward, the rollers and the friction rod experience sliding friction.
[0014] In some embodiments, a slide rail is provided on the outside of the injection tube, a slider is slidably disposed inside the slide rail, a return spring is provided on the slider, the end of the return spring is fixedly connected to the slide rail, and the slider is fixedly connected to a trigger rod below the valve body.
[0015] In some embodiments, a plurality of fan blades are provided on the outer side of the rotating shaft.
[0016] The present invention has at least the following beneficial effects: Reduce electrolyte residue: After electrolyte filling is completed, the present invention uses dry ice particles in a dry ice can to rinse the electrolyte filling port of the lithium battery. Through the dual action of low temperature freezing and physical flushing, residual electrolyte is effectively removed, reducing the burden of subsequent cleaning work and improving the cleanliness and safety of the battery. Improve electrolyte injection efficiency: The dispersion component in the equipment can evenly disperse the electrolyte to the inside and outside of the lithium battery during the electrolyte injection process, avoiding the problem that the electrolyte is only concentrated in the central area of the battery, thereby improving the uniformity of electrolyte distribution and utilization rate, and thus improving the performance of the lithium battery. Intelligent valve control system: Through the intelligent control of valve body one and valve body two, the automatic switching between dry ice rinsing and electrolyte injection is realized. When the injection tube moves to the designated position, the trigger rod automatically triggers the valve body to open. After completing the corresponding operation, it automatically closes, reducing manual intervention and improving the automation level and ease of operation of the equipment. Reasonable structural design: The transmission component in this invention uses the power generated by the flow of dry ice particles to drive the dispersion component to work, without the need for an additional power source, thus realizing the efficient use of energy and simplification of structure. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Another structural diagram; Figure 3 For the present invention Figure 1 Schematic diagram of a partial structure; Figure 4 This is a schematic cross-sectional view of the injection tube of the present invention; Figure 5 This is a schematic cross-sectional view of the transmission shaft of the present invention; Figure 6 This is a schematic diagram of the outer structure of the injection tube of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the valve body structure of the present invention; Figure 9 This is a schematic diagram of the valve body structure of the present invention; Figure 10 This is a schematic diagram of the structure at the rotating shaft in Embodiment 2 of the present invention.
[0018] In the diagram: 1-Main body; 2-Mounting frame; 3-Dry ice tank; 4-Injection pipe; 5-Transfer tank; 6-Cleaning head; 7-Dispersion assembly; 71-Dispersion head; 72-Through groove; 73-Elastic band; 74-Rotating shaft; 8-Transmission assembly; 81-Housing; 82-Transmission shaft; 83-Blade; 84-Splined shaft; 85-Connecting spring; 9-Valve body one; 91-Block ball one; 92-Connecting shaft one; 93-Gear one; 94-Rack one; 10-Valve body two; 101-Fixing box; 102-Block ball two; 103-Connecting shaft two; 104-Gear two; 105-Rack two; 106-Friction rod; 107-Support spring; 11-Trigger rod; 12-Connecting pipe; 13-Cleaning pipe; 14-Connecting frame; 15-Roller; 16-Slide rail; 17-Slider; 18-Reset spring; 19-Fan blade. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Example 1, please refer to Figures 1-9This invention provides a technical solution: an aluminum-cased lithium battery electrolyte injection device, comprising a main body 1, on which a storage tank for storing electrolyte is provided (not shown in the figure, as it is prior art and will not be described in detail here). A mounting frame 2 is provided on the main body 1, and an electric push rod is provided on the mounting frame 2. It also includes a dry ice tank 3 located at the end of the electric push rod, containing dry ice. A support is provided on the outside of the dry ice tank 3, and the dry ice tank 3 is connected to the electric push rod via the support. An injection pipe 4 is provided on the support, and the injection pipe 4 is connected to the storage tank via a pipe and a pump to inject electrolyte into the battery. A transition tank 5 is provided on one side of the injection pipe 4, and a cleaning head 6 is provided on the outside of the injection pipe 4 to rinse the injection port of the lithium battery with dry ice after injection. A dispersion component 7 is provided inside the injection pipe 4, which can transport the electrolyte injected into the lithium battery to the outside of the lithium battery during injection. A transmission component 8 is also provided inside the injection pipe 4 to drive the dispersion component 7 to move and transport the electrolyte.
[0021] Valve body 19 and valve body 20 are respectively located between dry ice tank 3 and transition tank 5 and between transition tank 5 and cleaning head 6. A trigger rod 11 is provided on the outside of injection pipe 4. When the trigger rod 11 moves, it can open valve body 19 and valve body 20.
[0022] The dispersion assembly 7 includes a dispersion head 71 movably disposed at the bottom of the injection tube 4. The dispersion head 71 is a cylindrical structure with a closed bottom. Multiple through grooves 72 are opened on the outside of the dispersion head 71. Multiple elastic bands 73 are fixedly disposed in the through grooves 72. The width of the elastic bands 73 is the same as the width of the through grooves 72. A rotating shaft 74 is fixedly connected to the dispersion head 71. When the electrolyte is injected, the injection pressure can compress the elastic band 73 to deform it, thereby exposing the through groove 72, so that the electrolyte can flow out from the multiple through grooves 72 on the side of the dispersing head 71. It should be noted that in order to ensure that the elastic band 73 is not corroded by the electrolyte, the elastic band 73 can be made of corrosion-resistant fluororubber or other corrosion-resistant elastic materials.
[0023] The transmission assembly 8 includes a housing 81 disposed above the injection tube 4. A transmission shaft 82 is rotatably disposed inside the housing 81. The bottom of the transmission shaft 82 passes through the housing 81. Multiple blades 83 are disposed on the outside of the transmission shaft 82. A splined shaft 84 is fixedly connected to the top of the rotating shaft 74. A splined groove is opened at the bottom of the transmission shaft 82. The splined shaft 84 is slidably disposed in the splined groove. A connecting spring 85 is disposed in the splined groove. The two ends of the connecting spring 85 are fixedly connected to the inside of the transmission shaft 82 and the splined shaft 84, respectively.
[0024] A connecting pipe 12 is provided between the dry ice tank 3 and the transition tank 5. The middle section of the connecting pipe 12 is connected to the shell 81. When dry ice particles pass through the connecting pipe 12 and the shell 81, the flowing dry ice can drive the blade 83 and the drive shaft 82 to rotate. The drive shaft 82 drives the spline shaft 84 and the rotating shaft 74 to rotate, which in turn drives the dispersing head 71 to rotate. A cleaning pipe 13 is provided between the transition tank 5 and the cleaning head 6. Valve body 1 9 and valve body 2 10 are respectively installed in the connecting pipe 12 and the cleaning pipe 13.
[0025] The valve body 9 includes a retaining ball 91 rotatably disposed inside the connecting pipe 12. A connecting shaft 92 is fixedly connected to the retaining ball 91. A gear 93 is disposed on the outside of the connecting shaft 92. A rack 94 is fixedly disposed at one end of the trigger rod 11. When the injection pipe 4 moves downward into the injection port, the trigger rod 11 abuts against the outer shell of the lithium battery and moves upward. When the trigger rod 11 moves, it can drive the rack 94 to mesh with the gear 93, thereby driving the gear 93 to rotate. The gear 93 drives the retaining ball 91 to rotate through the connecting shaft 92, so that the connecting pipe 12 is open. At this time, the high-pressure dry ice in the dry ice tank 3 can enter the transition tank 5.
[0026] Valve body 2 10 includes a fixed box 101 fixedly installed outside the cleaning pipe 13. A baffle ball 2 102 is rotatably installed inside the cleaning pipe 13. A connecting shaft 2 103 is fixedly installed on the baffle ball 2 102. The end of the connecting shaft 2 103 extends into the fixed box 101 and is provided with a gear 2 104 at the end. A rack 2 105 that meshes with the gear 2 104 is provided inside the fixed box 101. A friction rod 106 is slidably installed inside the fixed box 101. A support spring 107 is fixedly installed on the outside of the friction rod 106. The bottom of the support spring 107 is connected to the fixed box 101.
[0027] A connecting frame 14 is provided on the trigger rod 11 located below the valve body 9, and another trigger rod 11 is fixedly installed at the end of the connecting frame 14 so that the two trigger rods 11 move synchronously.
[0028] Multiple rollers 15 are rotatably mounted on the outer side of the top of the trigger rod 11 located below the valve body 2 10. The multiple rollers 15 are rotatably mounted on the trigger rod 11 via one-way bearings. When the trigger rod 11 moves upward and contacts the friction rod 106, the rollers 15 rotate on the trigger rod 11. When the trigger rod 11 returns to its original position and moves downward, there is sliding friction between the rollers 15 and the friction rod 106, which in turn drives the friction rod 106 to move downward. The friction rod 106 drives the rack 2 105 to move, which in turn drives the gear 2 104 to rotate, causing the cleaning pipe 13 to open. At this time, dry ice in the transition tank 5 is sprayed out from the cleaning head 6 to clean the liquid injection port. When the friction rod 106 disengages from the rollers 15, the friction rod 106 drives the rack 2 105 to return to its original position, causing the cleaning pipe 13 to close.
[0029] A slide rail 16 is provided on the outside of the injection tube 4. A slider 17 is slidably arranged inside the slide rail 16. A return spring 18 is provided on the slider 17. The end of the return spring 18 is fixedly connected to the slide rail 16. The slider 17 is fixedly connected to the trigger rod 11 below the valve body 9.
[0030] In summary, during use, when the electric actuator moves the injection tube 4 downwards into the injection port, the trigger rod 11 abuts against the lithium battery casing and moves upwards. When the trigger rod 11 moves upwards, it opens the valve body 9, allowing the dry ice in the dry ice tank 3 to flow through the connecting pipe 12 and the housing 81 into the transition tank 5. The flowing dry ice particles drive the blade 83 and the drive shaft 82 to rotate. The drive shaft 82 drives the spline shaft 84 and the rotating shaft 74 to rotate, which in turn drives the dispersing head 71 to rotate, allowing the electrolyte to be dispersed and injected into the lithium battery during injection, improving the uniformity of the electrolyte. When the injection is finished, the electric actuator moves the injection tube 4 upwards, and at this time, another trigger rod 11 drives the valve body 10 to open, causing the cleaning head to spray dry ice to clean the injection port and prevent electrolyte residue.
[0031] Example 2, please refer to Figure 10 The main structure of Embodiment 2 is the same as that of Embodiment 1, except that multiple fan blades 19 are provided on the outside of the rotating shaft 74. When the rotating shaft 74 rotates, it can drive the fan blades 19 to rotate. The fan blades 19 can accelerate the flow of electrolyte in the injection tube 4, which can increase the pressure and promote the uniform mixing of electrolyte to avoid sedimentation.
[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An aluminum-cased lithium battery electrolyte filling device, comprising a main body (1), a storage tank for storing electrolyte disposed on the main body (1), a mounting frame (2) disposed on the main body (1), and an electric actuator disposed on the mounting frame (2), characterized in that: It also includes: A dry ice container (3) is set at the end of an electric push rod and contains dry ice. A support is set on the outside of the dry ice container (3), and the dry ice container (3) is connected to the electric push rod through the support. The injection tube (4) is mounted on the support and connected to the storage tank via a pump to inject electrolyte into the battery; The transition tank (5) and the cleaning head (6) are provided. The transition tank (5) is located on one side of the injection pipe (4) and is connected to the dry ice tank (3) and the cleaning head (6). The cleaning head (6) is located on the outside of the injection pipe (4) and is used to rinse the injection port of the lithium battery with dry ice after the injection is completed. The dispersion component (7) is installed inside the injection tube (4) and can transport the electrolyte injected into the lithium battery to the outside of the lithium battery during injection. The transmission component (8) is installed inside the injection pipe (4) and is connected to the dispersion component (7) for driving the dispersion component (7) to move and transport the electrolyte; Valve body one (9) and valve body two (10) are respectively located between the dry ice tank (3) and the transition tank (5) and between the transition tank (5) and the cleaning head (6). A trigger rod (11) is provided on the outside of the injection pipe (4). When the trigger rod (11) moves, it can open valve body one (9) and valve body two (10).
2. The aluminum-cased lithium battery electrolyte filling device according to claim 1, characterized in that: The dispersion assembly (7) includes a dispersion head (71) movably disposed at the bottom of the injection tube (4). The dispersion head (71) is a cylindrical structure with a closed bottom. Multiple through grooves (72) are provided on the outside of the dispersion head (71). Multiple elastic bands (73) are fixedly disposed in the through grooves (72). The width of the elastic bands (73) is the same as the width of the through grooves (72). A rotating shaft (74) is fixedly connected to the dispersion head (71).
3. The aluminum-cased lithium battery electrolyte filling device according to claim 2, characterized in that: The transmission assembly (8) includes a housing (81) disposed above the injection tube (4), a transmission shaft (82) is rotatably disposed inside the housing (81), the bottom of the transmission shaft (82) penetrates the housing (81), a plurality of blades (83) are disposed on the outside of the transmission shaft (82), a spline shaft (84) is fixedly connected to the top of the rotating shaft (74), a spline groove is provided at the bottom of the transmission shaft (82), the spline shaft (84) is slidably disposed in the spline groove, a connecting spring (85) is disposed in the spline groove, and the two ends of the connecting spring (85) are fixedly connected to the inside of the transmission shaft (82) and the spline shaft (84) respectively.
4. The aluminum-cased lithium battery electrolyte filling device according to claim 3, characterized in that: A connecting pipe (12) is provided between the dry ice tank (3) and the transition tank (5). The middle section of the connecting pipe (12) is connected to the shell (81). When dry ice particles pass through the connecting pipe (12) and the shell (81), the flowing dry ice can drive the blades (83) and the drive shaft (82) to rotate. A cleaning pipe (13) is provided between the transition tank (5) and the cleaning head (6). The valve body one (9) and the valve body two (10) are respectively installed in the connecting pipe (12) and the cleaning pipe (13).
5. The aluminum-cased lithium battery electrolyte filling device according to claim 4, characterized in that: The valve body (9) includes a stop ball (91) rotatably disposed in the connecting pipe (12), a connecting shaft (92) fixedly connected to the stop ball (91), a gear (93) disposed on the outside of the connecting shaft (92), and a rack (94) fixedly disposed at one end of the trigger rod (11). When the trigger rod (11) moves, it can drive the rack (94) to mesh with the gear (93).
6. The aluminum-cased lithium battery electrolyte filling device according to claim 5, characterized in that: The valve body 2 (10) includes a fixed box (101) fixedly installed outside the cleaning pipe (13). A baffle ball 2 (102) is rotatably installed inside the cleaning pipe (13). A connecting shaft 2 (103) is fixedly installed on the baffle ball 2 (102). The end of the connecting shaft 2 (103) extends into the fixed box (101) and is provided with a gear 2 (104) at the end. A rack 2 (105) meshing with the gear 2 (104) is provided inside the fixed box (101). A friction rod (106) is slidably installed inside the fixed box (101). A support spring (107) is fixedly installed on the outside of the friction rod (106). The bottom of the support spring (107) is connected to the fixed box (101).
7. The aluminum-cased lithium battery electrolyte filling device according to claim 6, characterized in that: A connecting frame (14) is provided on the trigger rod (11) located below the valve body (9), and another trigger rod (11) is fixedly provided at the end of the connecting frame (14).
8. The aluminum-cased lithium battery electrolyte filling device according to claim 7, characterized in that: Multiple rollers (15) are rotatably mounted on the outer side of the top of the trigger rod (11) located below the valve body (10). The multiple rollers (15) are rotatably mounted on the trigger rod (11) through a one-way bearing. When the trigger rod (11) moves upward and contacts the friction rod (106), the rollers (15) rotate on the trigger rod (11). When the trigger rod (11) resets and moves downward, there is sliding friction between the rollers (15) and the friction rod (106).
9. The aluminum-cased lithium battery electrolyte filling device according to claim 8, characterized in that: A slide rail (16) is provided on the outside of the injection tube (4), and a slider (17) is slidably provided inside the slide rail (16). A reset spring (18) is provided on the slider (17), and the end of the reset spring (18) is fixedly connected to the slide rail (16). The slider (17) is fixedly connected to the trigger rod (11) below the valve body (9).
10. The aluminum-cased lithium battery electrolyte filling device according to claim 9, characterized in that: Multiple fan blades (19) are provided on the outer side of the rotating shaft (74).