Lithium ion soft package battery liquid injection device for experiment
By designing a combination device of electrolyte temporary storage container and injection channel, and using servo motor to control electrolyte injection, the problems of high cost and low precision of existing lithium-ion soft-pack battery injection equipment are solved, and low-cost and high-precision electrolyte injection effect is achieved.
Patent Information
- Application Number
- CN202422556938.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-22
AI Technical Summary
Existing lithium-ion soft-pack battery filling equipment is expensive, difficult to maintain, and the uncertainty of manual operation leads to inaccurate liquid absorption, which cannot meet the needs of experimental evaluation.
An injection device was designed, which included an electrolyte temporary storage container, an injection channel, a one-way valve, a constant volume pumping device and a liquid outlet switch. The electrolyte injection was controlled by a servo motor and a worm gear mechanism, and the pressure plate assembly and sealing plate were combined to ensure sealing and accuracy.
It achieves high-precision electrolyte injection with low cost and convenient maintenance, which is suitable for small-batch battery injection, reduces the uncertainty of manual operation, and improves injection accuracy and equipment reliability.
Smart Images
Figure CN223390748U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery testing, in particular to a liquid injection device for a lithium ion soft-pack battery used in an experiment. Background Art
[0002] In order to evaluate the performance of lithium-ion positive electrode materials or negative electrode materials, soft-pack full batteries are generally produced for testing. In the process of making soft-pack full batteries, electrolyte needs to be injected into the battery cell as a carrier for the circulation of lithium ions between the positive and negative electrodes. In the production of such battery cells, the number of soft-pack batteries per batch is generally less than one hundred, and the number of batteries per batch is relatively small. The main methods of filling lithium-ion soft-pack batteries are mechanical automatic filling and manual filling. Mechanical automatic filling uses a quantitative pump such as a diaphragm pump to extract a specified volume of electrolyte and inject it into the battery cell. Manual filling mainly uses a pipette. After adjusting the pipette scale, the pipette is manually used to manually draw the electrolyte from the container, and then the pipette is manually pushed to inject the electrolyte into the battery cell.
[0003] Mechanical automatic filling is more suitable for mass production, but the filling pump requires a lot of supporting equipment and requires debugging before it can be put into use. It occupies a large area, is costly, and difficult to maintain. It is not suitable for filling soft-pack lithium-ion batteries for experimental evaluation. If manual filling is used, the uncertainty of manual operation can easily lead to inaccurate aspiration.
[0004] In view of this, the present utility model is proposed. Utility Model Content
[0005] The purpose of the utility model is to provide a liquid injection device for a lithium-ion soft-pack battery for experimental use, so as to solve or improve the above-mentioned technical problems.
[0006] The utility model can be achieved like this:
[0007] In a first aspect, the utility model provides an experimental lithium-ion soft-pack battery injection device, comprising an electrolyte temporary storage container and an injection channel;
[0008] One end of the liquid injection channel is communicated with the electrolyte temporary storage container, and the liquid injection channel is sequentially provided with a first one-way valve, a constant volume pumping device and a liquid outlet switch.
[0009] In an optional embodiment, the experimental lithium-ion soft-pack battery injection device further includes a second one-way valve, which is arranged in the injection channel and located between the constant volume pumping device and the liquid outlet switch.
[0010] In an optional embodiment, the experimental lithium-ion soft-pack battery filling device further includes a filling hose, which is connected to an end of the filling channel away from the electrolyte temporary storage container.
[0011] In an optional embodiment, the constant volume pumping device includes a constant volume column and a power source, one end of the constant volume column is connected to the injection channel, and the power source is connected to the constant volume column, so as to enable the constant volume column to draw electrolyte from the injection channel and to discharge the electrolyte into the injection channel.
[0012] In an optional embodiment, the power source includes a servo motor and a worm gear mechanism, and the servo motor is connected to the piston of the constant volume column through the worm gear mechanism.
[0013] In an optional embodiment, the experimental lithium-ion soft-pack battery filling device further includes a pressure plate assembly, which includes a temporary storage container pressure plate, a connecting rod, and a sealing plate. The sealing plate is movably disposed vertically on the electrolyte temporary storage container, one end of the connecting rod is connected to the sealing plate, and the other end of the connecting rod is connected to the temporary storage container pressure plate;
[0014] The liquid injection channel is connected to the bottom end of the electrolyte temporary storage container.
[0015] In an optional embodiment, there are multiple connecting rods, and the multiple connecting rods are evenly distributed.
[0016] In an optional embodiment, the experimental lithium-ion soft-pack battery filling device further includes an electrolyte filling channel, one end of the electrolyte filling channel is connected to the electrolyte temporary storage container, and the other end of the electrolyte temporary storage container is formed as an electrolyte filling port.
[0017] In an optional embodiment, an electrolyte filling port switch is provided on the electrolyte filling channel.
[0018] In an optional embodiment, the electrolyte perfusion channel includes a vertical tube and an arc tube, the electrolyte perfusion port is formed at the top of the vertical tube, the bottom end of the vertical tube is connected to the top end of the arc tube, and the bottom end of the arc tube is connected to the side wall of the electrolyte temporary storage container.
[0019] The beneficial effects of the utility model include:
[0020] The experimental lithium-ion soft-pack battery filling device provided by the present invention includes an electrolyte temporary storage container and a liquid filling channel. One end of the liquid filling channel is connected to the electrolyte temporary storage container, and a first one-way valve, a constant volume pumping device and a liquid outlet switch are sequentially arranged on the liquid filling channel. When it is necessary to fill the battery with liquid, the liquid outlet switch is controlled to be closed, and the constant volume pumping device is controlled to pump liquid, and the electrolyte in the electrolyte temporary storage container enters the constant volume pumping device through the liquid filling channel. At this time, the battery can be assembled at the other end of the liquid filling channel, the liquid outlet switch is opened, and the constant volume pumping device is controlled to discharge liquid. Due to the presence of the first one-way valve, the electrolyte stored in the constant volume pumping device can only enter the battery through the liquid outlet switch, thereby realizing liquid filling of the battery.
[0021] The experimental lithium-ion soft-pack battery filling device has a simple structure, involves fewer parts, is easy to maintain, has low maintenance costs, has good equipment reliability, and has higher liquid aspiration accuracy compared to manual filling methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 A schematic diagram of the structure of the experimental lithium-ion soft-pack battery injection device provided in this embodiment from a first perspective;
[0024] Figure 2 A schematic structural diagram of the experimental lithium-ion soft-pack battery injection device provided in this embodiment at a second viewing angle.
[0025] Icons: 100-liquid filling device for experimental lithium-ion soft-pack batteries; 10-electrolyte temporary storage container; 20-liquid filling channel; 30-first one-way valve; 40-constant volume pumping device; 41-constant volume column; 42-power source; 421-servo motor; 422-worm gear mechanism; 50-second one-way valve; 60-liquid outlet switch; 70-liquid filling hose; 80-pressure plate assembly; 81-temporary storage container pressure plate; 82-connecting rod; 83-sealing plate; 90-electrolyte filling channel; 91-vertical tube; 911-electrolyte filling port; 92-arc tube; 93-electrolyte filling port switch. DETAILED DESCRIPTION
[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0027] 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 rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.
[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.
[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of the utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," "third," etc., etc., are intended solely to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] Furthermore, the use of terms such as "horizontal" and "vertical" does not necessarily mean that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical", not that the structure must be completely horizontal, but that it can be slightly tilted.
[0031] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0032] Example
[0033] Please refer to Figure 1 and Figure 2 This embodiment provides an experimental lithium-ion soft-pack battery injection device 100, which includes an electrolyte temporary storage container 10 and an injection channel 20. One end of the injection channel 20 is connected to the electrolyte temporary storage container 10. The injection channel 20 is sequentially provided with a first one-way valve 30, a constant volume pumping device 40 and a liquid outlet switch 60.
[0034] When it is necessary to inject liquid into the battery, the liquid outlet switch 60 is controlled to be closed, and the constant volume pumping device 40 is controlled to pump liquid. The electrolyte in the electrolyte temporary storage container 10 enters the constant volume pumping device 40 through the injection channel 20. At this time, the battery can be assembled at the other end of the injection channel 20, the liquid outlet switch 60 is opened, and the constant volume pumping device 40 is controlled to discharge liquid. Due to the presence of the first one-way valve 30, the electrolyte stored in the constant volume pumping device 40 can only enter the battery through the liquid outlet switch 60, thereby realizing liquid injection into the battery.
[0035] The experimental lithium-ion soft-pack battery injection device 100 has a simple structure, involves fewer parts, is easy to maintain, has low maintenance costs, has good equipment reliability, and has higher liquid aspiration accuracy compared to manual injection methods.
[0036] In order to prevent the electrolyte discharged into the battery from flowing back, in this embodiment, the experimental lithium-ion soft-pack battery filling device 100 also includes a second one-way valve 50, which is arranged in the filling channel 20 and is located between the constant volume pumping device 40 and the liquid outlet switch 60.
[0037] In addition, depending on the actual situation, a general switch valve can be used instead of a one-way valve.
[0038] In this embodiment, the experimental lithium-ion soft-pack battery injection device 100 further includes an injection hose 70 to facilitate injection of liquid into the battery.
[0039] The injection hose 70 is connected to the end of the injection channel 20 away from the electrolyte temporary storage container 10. After the electrolyte passes through the liquid outlet switch 60, it enters the injection hose 70. The operator can assemble the open end of the injection hose 70 into the battery.
[0040] In this embodiment, the constant volume pumping device 40 includes a constant volume column 41 and a power source 42 .
[0041] One end of the constant volume column 41 is connected to the injection channel 20 , and the power source 42 is connected to the constant volume column 41 , so as to enable the constant volume column 41 to draw electrolyte from the injection channel 20 and to discharge the electrolyte into the injection channel 20 .
[0042] The constant volume column 41 can be made of a transparent material to facilitate visual observation of the injection volume. Furthermore, a scale can be set on the constant volume column 41 to accurately control the volume of electrolyte injected. In addition, full pumping and full discharge can also be performed, that is, the constant volume column 41 is fully pumped each time the liquid is pumped out, and the electrolyte is also completely discharged when it is discharged.
[0043] In order to improve control accuracy, in this embodiment, the power source 42 includes a servo motor 421 and a worm gear mechanism 422 , and the servo motor 421 is connected to the piston of the constant volume column 41 through the worm gear mechanism 422 .
[0044] The output shaft of the servo motor 421 rotates forward to cause the piston to rise, thereby pumping liquid from the constant volume column 41 ; the output shaft of the servo motor 421 rotates reverse to cause the piston to descend, thereby discharging liquid from the constant volume column 41 .
[0045] In addition, in other embodiments, a general motor may be used, or a motor and a rack and pinion mechanism may be used in combination.
[0046] In order to achieve a better sealing effect, in this embodiment, the experimental lithium-ion soft-pack battery injection device 100 further includes a pressing plate assembly 80 .
[0047] The pressure plate assembly 80 includes a temporary storage container pressure plate 81, a connecting rod 82, and a sealing plate 83. The sealing plate 83 is movably arranged vertically on the electrolyte temporary storage container 10. One end of the connecting rod 82 is connected to the sealing plate 83, and the other end of the connecting rod 82 is connected to the temporary storage container pressure plate 81. The liquid injection channel 20 is connected to the bottom end of the electrolyte temporary storage container 10.
[0048] The electrolyte is contained within the electrolyte temporary storage container 10 and sealed by a sealing plate 83. When the electrolyte is injected into the electrolyte temporary storage container 10, the sealing plate 83 rises; when the electrolyte in the electrolyte temporary storage container 10 is discharged, the sealing plate 83 descends, ensuring that the sealing plate 83 always seals the electrolyte in the electrolyte temporary storage container 10.
[0049] In addition, during the drainage process, the gravity of the temporary storage container pressing plate 81 and the connecting rod 82 acts on the electrolyte to speed up the drainage. Alternatively, the operator can press the temporary storage container pressing plate 81 to improve the drainage efficiency.
[0050] Through the above design, the interior of the electrolyte temporary storage container 10 is completely sealed, which can protect the electrolyte from environmental influences. The electrolyte has a good preservation effect and is not easy to deteriorate in a short time. It can also prevent the electrolyte from absorbing water and causing gas production inside the battery cell, resulting in excessive side reactions and affecting the test results.
[0051] In order to better balance the forces, in this embodiment, there are multiple connecting rods 82 , and the multiple connecting rods 82 are evenly distributed.
[0052] In some embodiments, five connecting rods 82 may be used, arranged in a manner of one in the middle and four evenly distributed around the periphery. In other embodiments, the number of connecting rods 82 may also be three, four, or six.
[0053] In order to facilitate the replenishment of the electrolyte temporary storage container 10 , in this embodiment, the experimental lithium-ion soft-pack battery filling device 100 further includes an electrolyte filling channel 90 .
[0054] One end of the electrolyte filling channel 90 is connected to the electrolyte temporary storage container 10, and the other end of the electrolyte temporary storage container 10 is formed as an electrolyte filling port 911. With the above arrangement, when the electrolyte capacity in the electrolyte temporary storage container 10 is insufficient, the operator can replenish it through the electrolyte filling port 911.
[0055] At the same time, in order to achieve sealing, in this embodiment, an electrolyte filling port switch 93 is provided on the electrolyte filling channel 90. When no fluid is replenished, the electrolyte filling port switch 93 is generally controlled to remain closed.
[0056] To facilitate liquid injection, in this embodiment, the electrolyte injection channel 90 includes a vertical tube 91 and an arc tube 92 .
[0057] The electrolyte filling port 911 is formed at the top of the vertical tube 91. The bottom of the vertical tube 91 is connected to the top of the arc tube 92. The bottom of the arc tube 92 is connected to the side wall of the electrolyte temporary storage container 10. In other embodiments, the electrolyte filling channel 90 can also be an L-shaped tube.
[0058] As mentioned above, the working principle of the experimental lithium-ion soft-pack battery injection device 100 provided in this embodiment includes:
[0059] Initial stage: Control the liquid outlet switch 60 to be closed and the electrolyte filling port switch 93 to remain open. Electrolyte is injected into the electrolyte temporary storage container 10 through the electrolyte filling port 911. During the injection process, the temporary storage container pressure plate 81 can be slowly raised to improve the injection efficiency while ensuring the internal sealing and ensuring that the electrolyte fills the electrolyte temporary storage container 10. After the electrolyte temporary storage container 10 is injected, the electrolyte filling port switch 93 is closed.
[0060] Preparation stage before liquid injection: ensure that the piston of the constant volume column 41 is reset to the initial position (0 scale). If the piston is not in the initial position at this time, the liquid outlet switch 60 can be opened, and the servo motor 421 can be started to control the piston to descend to the initial position, and the liquid outlet switch 60 can be closed at the same time.
[0061] Injection stage: Turn on the servo motor 421 to allow the electrolyte in the injection channel 20 to enter the constant volume column 41. After the designated electrolyte is sucked into the constant volume column 41 with a scale, temporarily stop the servo motor 421. At this time, put the open end of the injection hose 70 into the battery cell, open the liquid outlet switch 60, turn on the servo motor 421, and realize the piston of the constant volume column 41 to descend. Due to the presence of the first one-way valve 30, the electrode liquid can only be discharged from the constant volume column 41 through the second one-way valve 50 to the liquid outlet switch 60, and finally enter the battery.
[0062] The device is easy to install, takes up little space, and is suitable for small batch injections, allowing for quick start of injection. Most of the structure can be made of stainless steel, which offers excellent corrosion resistance.
[0063] In summary, the experimental lithium-ion soft-pack battery filling device 100 provided by the present invention has a simple structure, involves fewer parts, is easy to maintain, has low maintenance costs, has good equipment reliability, and has higher liquid aspiration accuracy compared to manual filling methods.
[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. An experimental lithium-ion soft-pack battery injection device, characterized in that: It includes an electrolyte temporary storage container and a liquid injection channel; One end of the liquid injection channel is communicated with the electrolyte temporary storage container, and a first one-way valve, a constant volume pumping device and a liquid outlet switch are sequentially arranged on the liquid injection channel.
2. The experimental lithium-ion soft pack battery injection device according to claim 1, characterized in that: The experimental lithium-ion soft-pack battery injection device further includes a second one-way valve, which is arranged in the injection channel and located between the constant volume pumping device and the liquid outlet switch.
3. The experimental lithium-ion soft pack battery injection device according to claim 1, characterized in that: The experimental lithium-ion soft-pack battery injection device further includes an injection hose connected to one end of the injection channel away from the electrolyte temporary storage container.
4. The experimental lithium-ion soft pack battery injection device according to claim 1, characterized in that: The constant volume pumping device includes a constant volume column and a power source. One end of the constant volume column is connected to the injection channel. The power source is connected to the constant volume column to enable the constant volume column to suck electrolyte from the injection channel and to discharge the electrolyte into the injection channel.
5. The experimental lithium-ion soft pack battery injection device according to claim 4, characterized in that: The power source includes a servo motor and a worm gear mechanism, and the servo motor is connected to the piston of the constant volume column through the worm gear mechanism.
6. The experimental lithium-ion soft-pack battery injection device according to any one of claims 1 to 5, characterized in that: The experimental lithium-ion soft-pack battery filling device also includes a pressure plate assembly, which includes a temporary storage container pressure plate, a connecting rod, and a sealing plate. The sealing plate is movably arranged in the vertical direction on the electrolyte temporary storage container. One end of the connecting rod is connected to the sealing plate, and the other end of the connecting rod is connected to the temporary storage container pressure plate. Wherein, the injection channel is connected to the bottom end of the electrolyte temporary storage container.
7. The experimental lithium-ion soft pack battery injection device according to claim 6, characterized in that: There are multiple connecting rods, and the connecting rods are evenly distributed.
8. The experimental lithium-ion soft pack battery injection device according to any one of claims 1 to 5, characterized in that: The experimental lithium-ion soft-pack battery filling device further includes an electrolyte filling channel, one end of which is connected to the electrolyte temporary storage container, and the other end of the electrolyte temporary storage container is formed as an electrolyte filling port.
9. The experimental lithium-ion soft pack battery injection device according to claim 8, characterized in that: An electrolyte filling port switch is provided on the electrolyte filling channel.
10. The experimental lithium-ion soft pack battery injection device according to claim 8, characterized in that: The electrolyte perfusion channel includes a vertical tube and an arc tube, the electrolyte perfusion port is formed at the top of the vertical tube, the bottom end of the vertical tube is connected to the top end of the arc tube, and the bottom end of the arc tube is connected to the side wall of the electrolyte temporary storage container.