Control valve device for lithium battery formation process

Abstract

The utility model relates to a control valve device for a lithium battery formation process, which comprises a control valve main body, a motor driving module and a control module, the driving end of the motor driving module is connected with a push rod valve core to drive the push rod valve core to act, and a push rod valve core positioning pin is inserted beside the push rod valve core; the control module comprises a control box, a control panel, a zero position detection sensor and an external signal receiving module, the control panel is arranged in the control box, the zero position detection sensor is embedded in the side of the control box and located on the side of the push rod valve element positioning pin so as to detect the position of the push rod valve element positioning pin, and the zero position detection sensor is electrically connected with the control panel; the external signal receiving module is embedded in the control box and is electrically connected with the control panel; and the control panel is electrically connected with a control signal input end of the motor driving module. The device is beneficial to quickly, accurately and stably controlling the pressure in the battery formation process.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery formation, in particular to a control valve device used in a lithium battery formation process. Background Art

[0002] Lithium battery formation refers to the activation of the battery cell through the first charge. During this process, an effective passivation film (SEI film) is generated on the negative electrode surface to achieve the "initialization" of the lithium battery. During the formation of lithium batteries, the battery needs to be pressure controlled to ensure the structural stability and safety of the battery. During the formation process, the decomposition of the electrolyte and the formation of the SEI film will produce a certain amount of gas, which will increase the internal pressure of the battery. If the internal pressure of the battery is too high, it may cause the battery to deform, rupture or explode, affecting the performance and life of the battery. Therefore, it is necessary to monitor and adjust the pressure of the battery during the formation process to keep the internal pressure of the battery within a reasonable range. At present, the commonly used pressure control scheme is to use an electrical proportional valve and a solenoid valve group to control the air pressure at the positive pressure end, and cooperate with the air-controlled on-off valve and vacuum pressure-regulating valve at the negative pressure end to achieve air pressure control. By adjusting the opening of the electrical proportional valve, the feedback signal from the pressure sensor is controlled to control the internal air pressure of the lithium battery. However, the existing pressure control scheme has the following disadvantages: 1) The response speed, accuracy and reliability of the existing pressure control scheme are not high, and it is impossible to timely, accurately and stably control the pressure in the battery formation process; 2) The components used in the existing drain valve group are high in cost, the gas path is complex, and maintenance is difficult, which is prone to pipeline blockage, leakage and other faults. Summary of the invention

[0003] The utility model aims to provide a control valve device for a lithium battery formation process, which is conducive to quickly, accurately and stably controlling the pressure in the battery formation process.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a control valve device for lithium battery formation process, including a control valve body, and also including a motor drive module and a control module, the motor drive module is arranged on the upper part of the control valve body, the driving end of the motor drive module is connected to the push rod valve core on the control valve body to drive the push rod valve core to move, and a push rod valve core positioning pin is inserted beside the push rod valve core; the control module includes a control box, a control board, a zero position detection sensor and an external signal receiving module, the control box is arranged beside the control valve body, the control board is arranged inside the control box, the zero position detection sensor is embedded in the side of the control box and is located beside the push rod valve core positioning pin to detect the position of the push rod valve core positioning pin, the zero position detection sensor is electrically connected to the control board, the external signal receiving module is embedded in the control box and electrically connected to the control board; the control board is electrically connected to the control signal input end of the motor drive module.

[0005] Furthermore, the motor driving module is a screw stepping motor, a screw nut of the screw stepping motor is fixedly connected to the push rod valve core, and the control board is electrically connected to the control signal input end of the screw stepping motor.

[0006] Furthermore, the screw stepper motor includes a motor body, a screw and a screw nut. The motor body drives the screw to rotate. The screw nut cooperates with the screw. The front end face of the screw nut is fixedly connected to the push rod valve core. A spring is sleeved on the outside of the screw. The front and rear ends of the spring are respectively pressed on the rear end face of the screw nut and the front end face of the motor body.

[0007] Furthermore, the external signal receiving module is an aviation plug.

[0008] Furthermore, the control module also includes a digital display module, which is embedded in the control box and electrically connected to the control board.

[0009] Furthermore, a light emitting diode is provided on the control board.

[0010] Furthermore, the control valve body is connected to the battery clamp through a pipeline to control the pressure in the battery clamp.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model adopts a zero-position detection sensor to detect the position of the push rod spool of the control valve, and can obtain the opening of the control valve in combination with the signal of the pressure sensor received from the outside; on this basis, a motor drive module is adopted to drive the push rod spool of the control valve to move, thereby improving the response speed, accuracy and reliability of the pressure control in the battery clamp, being able to timely, accurately and stably control the pressure in the battery formation process, avoiding the pressure fluctuation of the battery, and improving the performance and life of the battery; and the device has a simple structure, is easy to maintain, has a low implementation cost, and has strong practicality and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the device structure of an embodiment of the utility model;

[0013] Figure 2 yes Figure 1 AA section view;

[0014] Figure 3 It is a side view of the device structure of an embodiment of the utility model;

[0015] Figure 4 yes Figure 2 BB cross-sectional view.

[0016] In the figure: 1. Screw stepper motor; 2. Spring; 3. Screw nut; 4. Push rod valve core; 5. Push rod valve core positioning pin; 6. O-ring rubber seal; 7. Lower valve body - double port; 8. Aviation plug; 9. Zero position detection sensor; 10. Digital display module; 11. Control board; 12. Light emitting diode; 13. Vacuum diameter; 14. Vacuum valve port; 15. Valve seat; 16. Working diameter; 17. Inlet valve port; 18. Valve core cavity. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] like Figure 1-3 As shown, this embodiment provides a control valve device for lithium battery formation process, including a control valve body, a motor drive module and a control module, wherein the motor drive module is arranged on the upper part of the control valve body, and the driving end of the motor drive module is connected to the push rod valve core 4 on the control valve body to drive the push rod valve core to move and accurately control the opening of the control valve, and a push rod valve core positioning pin 5 is inserted beside the push rod valve core 4; the control module includes a control box, a control board 11, a zero position detection sensor 9 and an external signal receiving module, and the control box is arranged beside the control valve body. The board 11 is arranged inside the control box, the zero position detection sensor 9 is embedded in the side of the control box and is located next to the push rod valve core positioning pin 5, so as to determine whether the push rod valve core 4 is in the zero position by detecting the push rod valve core positioning pin 5, the zero position detection sensor 9 is electrically connected to the control board 11 to send the detected position signal to the control board, the external signal receiving module is used to receive signals from the pressure sensor and the host computer, the external signal receiving module is embedded in the control box and is electrically connected to the control board 11; the control board 11 is electrically connected to the control signal input end of the motor drive module.

[0021] In this embodiment, the motor driving module is a screw stepper motor 1, the screw nut 3 of the screw stepper motor 1 is fixedly connected to the push rod valve core 4, and the control board 11 is electrically connected to the control signal input end of the screw stepper motor 1. Specifically, the screw stepper motor 1 includes a motor body, a screw and a screw nut 3, the motor body drives the screw to rotate, the screw nut 3 cooperates with the screw, the front end face of the screw nut 3 is fixedly connected to the push rod valve core 4, and a spring 2 is sleeved on the outside of the screw, and the front and rear ends of the spring 2 are respectively pressed on the rear end face of the screw nut 3 and the front end face of the motor body to play a role in eliminating backlash and ensure the accuracy of motion control.

[0022] In this embodiment, the external signal receiving module is an aviation plug 8 .

[0023] In this embodiment, the control module further includes a digital display module 10, which is embedded in the control box and electrically connected to a control board 11. The control board 11 is provided with a light emitting diode 12.

[0024] The control valve body is connected to the battery clamp through a pipeline to control the pressure in the battery clamp. The utility model does not involve the battery clamp, but it is an essential part of the lithium battery formation process and is generally provided by the manufacturer.

[0025] The working principle of the device is as follows: the controller on the control board 11 combines the signal detected by the zero position detection sensor, the signal detected by the pressure sensor and the pressure control data sent by the host computer to calculate the opening of the control valve, and outputs a signal to the screw stepper motor 1 to drive the push rod valve core 4 to move, thereby accurately controlling the opening of the control valve, and then realizing the control of the pressure in the battery fixture. The specific working process is as follows: 1) Before the lithium battery formation begins, the host computer determines the relationship curve between the internal pressure and time of the best battery cell in the corresponding battery formation process according to different battery types and specifications, and then sends the pressure control data at each moment to the control board through the external signal receiving module, and stores it in the memory of the controller on the control board. 2) During the lithium battery formation process, the controller controls the control valve to start moving and receives the signal detected by the zero position detection sensor in real time. When the zero position detection sensor detects the push rod valve core positioning pin, it is judged that the push rod valve core is at the zero position, that is, the push rod valve core is in the position of opening and not opening. The zero position detection sensor can be simply understood as an inductive proximity sensor, which generates an output signal by detecting the change of the magnetic field when an object enters. When the positioning pin of the push rod valve core is detected by the zero position detection sensor, the valve core position is in an open-not-open state. The function of the zero position detection sensor is to locate the zero point position of the push rod valve core. Then, the pressure sensor continuously detects the pipeline pressure and sends it to the control board through the external signal receiving module. The controller compares the signal detected by the pressure sensor with the pressure control data at the corresponding moment, calculates the opening of the control valve and outputs a signal to the motor drive module to drive the push rod valve core to move, thereby controlling the difference between the real-time pressure in the battery fixture and the pressure control data at the corresponding moment within the set range, thereby realizing the control of the pressure in the battery fixture. 3) After the lithium battery is formed, the controller controls the control valve to close; and records the pressure data in the battery fixture in the memory of the controller for data analysis and quality management. Storing pressure data means saving the local work log, which is convenient for maintenance when a fault occurs. The stored data is the data detected by the pressure sensor and the pressure data provided by the host computer. The size of the stored data is only the size of the last three formation operations.

[0026] After receiving the control signal from the circuit board 11, the lead screw stepper motor 1 controls the lead screw (integrated in the lead screw stepper motor, generally represented as a whole) to rotate, so that the lead screw nut 3 moves up and down. The spring 2 is pressed between the motor body and the lead screw nut 3 to eliminate the backlash and ensure the accuracy of motion control.

[0027] The screw nut 3 and the push rod valve core 4 (one end of the push rod valve core 4 is connected to the screw through the screw nut 3, and the other end is connected to the sealing ring to control the valve core opening, that is, the degree of valve opening, thereby controlling the air pressure and flow) are connected with bolts. Therefore, the push rod valve core 4 moves with the screw nut 3. The up and down movement of the push rod valve core 4 will change the volume of the middle valve cavity, so as to achieve the purpose of controlling the gas flow rate and the pressure in the valve at the same time.

[0028] The O-shaped rubber sealing ring 6 is embedded in each O-shaped ring groove opened on the valve body and the valve core to seal and prevent leakage.

[0029] The push rod valve core locating pin 5 is connected to the push rod valve core 4, and the push rod valve core 4 drives the push rod valve core locating pin 5 to move; the zero position detection sensor 9 detects the position of the push rod valve core locating pin 5, forms a position signal and sends the data to the control board 11 via the communication line, and the control board 11 sends the position information to the upper computer, and the control signal information returned by the upper computer controls the screw stepper motor 1.

[0030] The aviation plug 8 connects the external pipeline to the inside of the control module, so that the control module can communicate with the host computer. The communication line inside the aviation plug 8 is connected to the control board 11, so that the control board can obtain the data of the host computer. The control board 11 will display the pressure data on the digital display module 10. The control board 11 also controls the light-emitting diode 12. When the exhaust system works normally, the light-emitting diode 12 will emit green light. When the exhaust system works abnormally, the light-emitting diode 12 will emit red light, and the control board 11 will send the fault signal to the host computer through the communication line via the aviation plug 8.

[0031] The lower valve body-double port 7 has two main working ports, namely the air intake valve port 17 and the vacuum valve port 14. The air intake valve port 17 is connected to the battery fixture through a connecting pipeline. The exhaust gas of the battery is introduced into the working path 16 through the air intake valve port 17 and then enters the valve seat 15 (the valve seat is the flow ring groove in the valve body; the valve seat is a key component of the valve, which is located in the valve body and cooperates with the valve core or valve disc to control the flow of the medium), and then enters the valve core cavity 18 (the cavity formed after the valve core is opened, 18 is the approximate position of the valve core cavity after the valve core is opened). The gas then enters the vacuum path 13 through the valve core cavity 18 and is then extracted from the vacuum valve port 14. The vacuum valve port 14 is connected to the negative pressure end, and the negative pressure end (not included in the utility model) provides a pressure difference as the driving force for exhaust.

[0032] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A control valve device for a lithium battery formation process, comprising a control valve body, characterized in that: It also includes a motor drive module and a control module, wherein the motor drive module is arranged on the upper part of the control valve body, and the drive end of the motor drive module is connected to the push rod valve core on the control valve body to drive the push rod valve core to move, and a push rod valve core positioning pin is inserted beside the push rod valve core; the control module includes a control box, a control board, a zero position detection sensor and an external signal receiving module, the control box is arranged beside the control valve body, and the control board is arranged inside the control box, the zero position detection sensor is embedded beside the control box and located beside the push rod valve core positioning pin to detect the position of the push rod valve core positioning pin, the zero position detection sensor is electrically connected to the control board, and the external signal receiving module is embedded in the control box and electrically connected to the control board; the control board is electrically connected to the control signal input end of the motor drive module.

2. A control valve device for lithium battery formation process according to claim 1, characterized in that: The motor driving module is a screw stepping motor, a screw nut of the screw stepping motor is fixedly connected to the push rod valve core, and the control board is electrically connected to the control signal input end of the screw stepping motor.

3. A control valve device for lithium battery formation process according to claim 2, characterized in that: The screw stepper motor includes a motor body, a screw and a screw nut. The motor body drives the screw to rotate. The screw nut cooperates with the screw. The front end face of the screw nut is fixedly connected to the push rod valve core. A spring is sleeved on the outside of the screw. The front and rear ends of the spring are respectively pressed on the rear end face of the screw nut and the front end face of the motor body.

4. A control valve device for lithium battery formation process according to claim 1, characterized in that: The external signal receiving module is an aviation plug.

5. A control valve device for lithium battery formation process according to claim 1, characterized in that: The control module also includes a digital display module, which is embedded in the control box and electrically connected to the control board.

6. A control valve device for lithium battery formation process according to claim 1, characterized in that: The control board is provided with a light emitting diode.

7. A control valve device for lithium battery formation process according to claim 1, characterized in that: The control valve body is connected to the battery clamp through a pipeline to control the pressure in the battery clamp.

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