A pulse needle for lithium battery filling machine

Abstract

This invention relates to the field of lithium battery electrolyte filling machine technology, and discloses a pulse-type needle for a lithium battery electrolyte filling machine. The needle includes a cylinder for holding electrolyte, with multiple pulse valves connected to the lower part of the cylinder via a piping assembly. Multiple injection needles are connected to the lower end of each pulse valve. Each pulse valve includes a valve body with an internal partition dividing the valve body into an inlet chamber and an outlet chamber. A connecting hole is provided on the partition to connect the inlet and outlet chambers. A valve core is installed on the connecting hole, and the valve core controls the opening and closing of the connecting hole via a control assembly. By using pulse valves for control, the continuous liquid flow is divided into discrete, uniformly sized micro-droplets. Precise control of the number and frequency of pulse signals allows for precise control of the total electrolyte injection volume, ensuring the uniformity of battery performance.

Description

Technical Field

[0001] This invention relates to the field of lithium battery filling machine technology, specifically to a pulse-type needle used in a lithium battery filling machine. Background Technology

[0002] In the lithium battery production process, the electrolyte injection process is one of the core links that determines battery performance (such as capacity, cycle life, and safety). Its core requirement is to achieve precise, stable, and pollution-free electrolyte injection.

[0003] Traditional liquid injection methods, such as gravity dripping or continuous pumping, have many inherent drawbacks: they are easily affected by changes in liquid level, pressure, and fluid viscosity, resulting in poor consistency of liquid injection volume for each cell, which directly affects the consistency, cycle life, and safety of the battery pack. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this application provides a pulse-type needle for a lithium battery filling machine.

[0006] (II) Technical Solution

[0007] To solve the above problems, this application provides the following technical solution: a pulse needle for a lithium battery electrolyte filling machine, including a material cylinder for placing electrolyte, the lower part of the material cylinder is connected to multiple pulse valves through a pipeline assembly, and the lower end of the pulse valves is connected to multiple injection needles;

[0008] The pulse valve includes a valve body, and a partition is provided inside the valve body to divide the valve body into an inlet chamber and an outlet chamber. A connecting hole is provided on the partition to connect the inlet chamber and the outlet chamber. A valve core is provided on the connecting hole, and the valve core controls the opening and closing of the connecting hole through a control component.

[0009] Preferably, the control component includes a fixed iron core, a moving iron core, and coils disposed on the outer rings of the fixed iron core and the moving iron core.

[0010] Preferably, the fixed iron core and the moving iron core are connected by a spring, and the other end of the moving iron core is connected to the valve core. When the coil is energized, the fixed iron core and the moving iron core generate a magnetic force that attracts each other, causing the moving iron core to drive the valve core to move, so that the connecting hole is in the open state, connecting the liquid inlet chamber and the liquid outlet chamber.

[0011] Preferably, the inlet chamber is connected to the pipeline assembly below the material cylinder, and the outlet chamber is connected to the injection needle.

[0012] Preferably, the pipeline assembly includes a connecting pipe and a diverter pipe. One end of the connecting pipe is connected to the discharge port below the material cylinder, and the other end of the connecting pipe is connected to the diverter pipe. The other end is provided with multiple pipeline interfaces for connecting to pulse valves respectively.

[0013] Preferably, a plurality of the pulse valves are disposed on a mounting plate, which is moved by a telescopic cylinder to move the injection needle above the lithium battery.

[0014] Preferably, a liquid inlet pipe is provided above the material cylinder, a control valve is provided on the liquid inlet pipe, a liquid level sensing component is provided inside the material cylinder, and the control valve is controlled according to the liquid level in the material cylinder.

[0015] Preferably, the liquid level sensing component includes a high liquid level sensor and a low liquid level sensor, both of which are disposed inside the material cylinder, with the high liquid level sensor located above the low liquid level sensor.

[0016] Preferably, it also includes a PLC control box, which is electrically connected to the pulse valve, the control valve, the high liquid level sensor, and the low liquid level sensor, respectively.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this application provides a pulse needle for a lithium battery filling machine, which has the following advantages:

[0019] 1. The pulse needle used in the lithium battery filling machine is controlled by a pulse valve, which divides the continuous liquid flow into discrete, uniformly sized micro-droplets. By precisely controlling the number and frequency of the pulse signal, the total filling volume can be precisely controlled, ensuring the uniformity of battery performance.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of a pulse needle for a lithium battery filling machine according to this application;

[0023] Figure 2 This is a schematic diagram of the pulse valve in this application.

[0024] Reference numerals in the attached diagram: 1. Material cylinder; 11. Connecting pipe; 12. Diverter pipe; 13. Control valve; 14. Inlet pipe; 15. High level sensor; 16. Low level sensor; 3. Pulse valve; 31. Valve body; 32. Inlet chamber; 33. Baffle plate; 34. Outlet chamber; 35. Valve core; 36. Moving iron core; 37. Coil; 38. Spring; 39. Fixed iron core; 4. Mounting plate; 5. Injection needle; 6. PLC control box. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Please see Figures 1-2This application provides a new technical solution: a pulse needle for a lithium battery electrolyte injection machine, including a material cylinder 1 for placing electrolyte, the lower part of the material cylinder 1 is connected to multiple pulse valves 3 through a pipeline assembly, and the lower end of the pulse valves 3 is connected to multiple injection needles 5.

[0030] The pulse valve 3 includes a valve body 31, and a partition 33 is provided inside the valve body 31 to divide the valve body 31 into an inlet chamber 32 and an outlet chamber 34. A connecting hole is provided on the partition 33 to connect the inlet chamber 32 and the outlet chamber 34. A valve core 35 is provided on the connecting hole, and the valve core 35 controls the opening and closing of the connecting hole through a control component.

[0031] In use, the electrolyte is stored in the feed cylinder 1 and flows into the inlet chamber 32 of the pulse valve 3 through the pipeline assembly under the action of gravity. When not energized, the valve core 35 closes the connecting hole on the partition 33 under the action of the spring force, blocking the liquid path. When the pulse valve 3 receives an electrical signal from the PLC 6, its internal control component is activated, driving the valve core 35 to lift up and open the connecting hole. After the connecting hole is opened, the inlet chamber 32 is connected to the outlet chamber 34 and flows out from the injection needle 5. When the electrical signal disappears, the valve core 35 quickly resets under the action of the spring, cutting off the liquid path. By controlling the frequency and number of electrical signals, the number and total volume of the sprayed droplets can be controlled to achieve pulsed liquid injection.

[0032] In some embodiments, the control component includes a fixed core 39, a moving core 36, and a coil 37 disposed on the outer ring of the fixed core 39 and the moving core 36.

[0033] In this embodiment, the fixed iron core 39 and the moving iron core 36 are connected by a spring 38. The other end of the moving iron core 36 is connected to the valve core 35. When the coil 37 is energized, the fixed iron core 39 and the moving iron core 36 generate a magnetic attraction force, causing the moving iron core 36 to drive the valve core 35 to move, so that the connecting hole is in the open state, connecting the liquid inlet chamber 32 and the liquid outlet chamber 34.

[0034] When coil 37 is energized, the attraction between fixed iron core 39 and moving iron core 36 overcomes the elastic force of spring 38, causing moving iron core 36 to move toward fixed iron core 39, which in turn drives valve core 35 to open the communication hole. When coil 37 is de-energized, the magnetic force disappears, and the elastic force of spring 38 pushes moving iron core 36 to reset, which in turn drives valve core 35 to tightly fit against partition 33, closing the communication hole and ensuring that there is no electrolyte leakage when the injection is paused.

[0035] In some embodiments, the inlet chamber 32 is connected to the pipeline assembly below the barrel 1, and the outlet chamber 34 is connected to the injection needle 5.

[0036] In a specific embodiment, the piping assembly includes a connecting pipe 11 and a diverter pipe 12. One end of the connecting pipe 11 is connected to the discharge port below the material cylinder 1, and the other end of the connecting pipe 11 is connected to the diverter pipe 12. The end of the diverter pipe 12 is provided with multiple pipe interfaces for connecting to pulse valves 3 respectively. The multiple pipe interfaces of the diverter pipe 12 are arranged in a manner corresponding to the number of pulse valves 3.

[0037] In some embodiments, a plurality of pulse valves 3 are disposed on a mounting plate 4, which is moved by a telescopic cylinder to move the injection needle 5 above the lithium battery. When injection is required, the piston rod of the telescopic cylinder extends, causing the mounting plate 4 to move downward, so that the injection needle 5 approaches and inserts into the injection port of the lithium battery; after injection is completed, the piston rod of the telescopic cylinder retracts, causing the mounting plate 4 to move upward, so that the injection needle 5 disengages from the lithium battery.

[0038] In some embodiments, an inlet pipe 14 is provided above the feed cylinder 1, and a control valve 13 is provided on the inlet pipe 14. A liquid level sensing component is provided inside the feed cylinder 1, and the control valve 13 is controlled according to the liquid level in the feed cylinder 1. The liquid level sensing component inside the feed cylinder 1 monitors the electrolyte level in real time. When the liquid level is lower than the set lower limit (triggered by the low liquid level sensor 16), the control valve 13 opens, and the inlet pipe 14 injects electrolyte into the feed cylinder 1. When the liquid level reaches the set upper limit (triggered by the high liquid level sensor 15), the control valve 13 closes, stopping the liquid injection, thereby achieving automatic maintenance of the liquid level in the feed cylinder 1.

[0039] In some embodiments, the liquid level sensing component includes a high liquid level sensor 15 and a low liquid level sensor 16, both of which are disposed inside the feed cylinder 1, with the high liquid level sensor 15 positioned above the low liquid level sensor 16. When the electrolyte level in the feed cylinder 1 drops to the detection position of the low liquid level sensor 16, the low liquid level sensor 16 outputs a "low liquid level signal"; when the electrolyte level rises to the detection position of the high liquid level sensor 15, the high liquid level sensor 15 outputs a "high liquid level signal." Through the signal linkage of the two sensors, precise control of the upper and lower limits of the liquid level is achieved.

[0040] In some embodiments, a PLC control box 6 is also included, which is electrically connected to the pulse valve 3, the control valve 13, the high liquid level sensor 15, and the low liquid level sensor 16. The PLC control box 6 receives signals from the high liquid level sensor 15 and the low liquid level sensor 16, operator instructions, and production line linkage signals. Then, according to a preset program, it controls the opening and closing of the replenishment control valve 13, drives the opening and closing of the pulse valve 3, and controls the lifting cylinder of the mounting plate 4.

[0041] Working principle: When using a pulse needle for a lithium battery filling machine, the electrolyte in the cylinder 1 flows into the connecting pipe 11 of the pipeline assembly through the bottom outlet under the action of gravity. It is then transported to the distribution pipe 12 through the connecting pipe 11. The distribution pipe 12 distributes the electrolyte evenly to the inlet chamber 32 of each pulse valve 3 through multiple pipe interfaces at the end. The PLC control box 6 sends an electrical signal to the coil 37 of the pulse valve 3 according to the preset filling parameters. After the coil 37 is energized, it generates a magnetic field. The fixed iron core 39 and the moving iron core 36 generate an attraction force, which overcomes the elastic force of the spring 38 and drives the moving iron core 36 to move towards the fixed iron core 39. This pushes the valve core 35 to lift up, opening the connecting hole on the partition plate 33. The electrolyte in the inlet chamber 32 flows into the outlet chamber 34 through the connecting hole, and then flows into the filling needle 5 through the interface below the outlet chamber 34, and finally into the lithium battery filling port.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulse-type needle for a lithium battery filling machine, characterized in that, It includes a container for holding electrolyte, the lower part of which is connected to multiple pulse valves via a piping assembly, and the lower end of each pulse valve is connected to multiple injection needles; The pulse valve includes a valve body, and a partition is provided inside the valve body to divide the valve body into an inlet chamber and an outlet chamber. A connecting hole is provided on the partition to connect the inlet chamber and the outlet chamber. A valve core is provided on the connecting hole, and the valve core controls the opening and closing of the connecting hole through a control component.

2. The pulse-type needle for a lithium battery filling machine according to claim 1, characterized in that, The control assembly includes a fixed iron core, a moving iron core, and coils disposed on the outer rings of the fixed iron core and the moving iron core.

3. A pulse-type needle for a lithium battery filling machine according to claim 2, characterized in that, The fixed iron core and the moving iron core are connected by a spring. The other end of the moving iron core is connected to the valve core. When the coil is energized, the fixed iron core and the moving iron core generate a magnetic force that attracts each other, causing the moving iron core to drive the valve core to move, so that the connecting hole is in the open state, connecting the liquid inlet chamber and the liquid outlet chamber.

4. The pulse-type needle for a lithium battery filling machine according to claim 1, characterized in that, The inlet chamber is connected to the pipeline assembly below the barrel, and the outlet chamber is connected to the injection needle.

5. A pulse-type needle for a lithium battery filling machine according to claim 4, characterized in that, The pipeline assembly includes a connecting pipe and a diverter pipe. One end of the connecting pipe is connected to the discharge port below the material cylinder, and the other end of the connecting pipe is connected to the diverter pipe. The other end is provided with multiple pipeline interfaces for connecting to pulse valves respectively.

6. A pulse-type needle for a lithium battery filling machine according to claim 1, characterized in that, Multiple pulse valves are mounted on a mounting plate, which is moved by a telescopic cylinder to move the injection needle above the lithium battery.

7. A pulse-type needle for a lithium battery filling machine according to claim 1, characterized in that, A liquid inlet pipe is provided above the material cylinder, and a control valve is provided on the liquid inlet pipe. A liquid level sensing component is provided inside the material cylinder, and the control valve is controlled according to the liquid level in the material cylinder.

8. A pulse-type needle for a lithium battery filling machine according to claim 7, characterized in that, The liquid level sensing component includes a high liquid level sensor and a low liquid level sensor, both of which are disposed inside the material cylinder, with the high liquid level sensor located above the low liquid level sensor.

9. A pulse-type needle for a lithium battery filling machine according to claim 1, characterized in that, It also includes a PLC control box, which is electrically connected to the pulse valve, the control valve, the high liquid level sensor, and the low liquid level sensor, respectively.

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