Lithium battery formation section vacuum proportional valve detection device

Abstract

The invention provides a lithium battery formation section vacuum proportional valve detection device which is used for detecting the pressure regulating performance of a lithium battery formation section vacuum proportional valve and comprises an upper computer, a rapid clamping loop and a detection loop communicated with a to-be-detected vacuum proportional valve (7). The detection loop is used for forming a working condition simulation environment for the vacuum proportional valve to be detected by simulating gas production of a lithium battery in a negative pressure formation process, the vacuum proportional valve to be detected is detected, and a detection scheme comprises a valve body static pressure regulation performance test, a valve body dynamic working condition pressure regulation performance test and a valve body pressure maintaining performance and air tightness test which are executed in sequence; according to the invention, accurate simulation of air pressure, flow velocity and other parameters in the battery formation process can be realized, the static performance of the vacuum proportional valve can be detected, and the lithium battery formation process can be simulated so as to detect the comprehensive performance of the valve body in the actual working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a detection device for a vacuum proportional valve in the formation section of a lithium battery. Background Art

[0002] The vacuum proportional valve is a key component in the lithium battery formation process. It dynamically adjusts gas flow and pressure through electromagnetic drive and closed-loop control. While evacuating reaction gases (such as H2, CO), it can inject inert gases (such as N2) to maintain a slightly positive pressure environment, ensuring uniform infiltration of the electrolyte and promoting the formation of a stable SEI film, thereby improving the battery cycle life and safety. Its corrosion-resistant valve body, high-precision sensor (±1% pressure control), and fast response design (millisecond level) can effectively prevent battery deformation and leakage and adapt to the multi-stage pressure process requirements of different battery models. Therefore, after the vacuum proportional valve is produced, it is necessary to comprehensively detect the performance of the valve body to reduce losses caused by unqualified valve body performance. It is necessary to detect the airtightness, static pressure regulation ability, dynamic pressure regulation ability, pressure holding ability, etc. of the valve body. Currently, most commonly used valve body detection systems only detect one performance of the valve body, such as airtightness and wear resistance, but cannot detect the comprehensive performance of the valve body, nor can they simulate the actual working conditions of the valve body.

[0003] The valve body detection system solutions of the prior art have the following disadvantages: There is no detection system for comprehensively detecting the performance of the vacuum proportional valve; The positioning and clamping process of the existing valve body detection system is cumbersome and requires a long time for debugging before detection can be carried out; The existing valve body detection system cannot simulate the actual working conditions of the target detection valve and can only detect static performance or single-characteristic performance, but cannot obtain the performance of the valve body under actual working conditions.

[0004] The present invention proposes a solution to the above problems. Summary of the Invention

[0005] The present invention provides a detection device for a vacuum proportional valve in the formation section of a lithium battery, which can accurately simulate parameters such as air pressure and flow rate during the battery formation process, can detect the static performance of the vacuum proportional valve, and also has the advantages of being able to simulate the lithium battery formation process to detect the comprehensive performance of the valve body under actual working conditions.

[0006] The present invention adopts the following technical solutions.

[0007] A detection device for a vacuum proportional valve in the formation section of a lithium battery, which is used to detect the pressure regulation performance of the vacuum proportional valve in the formation section of the lithium battery. It includes a host computer, a quick clamping circuit, and a detection circuit communicated with the vacuum proportional valve to be tested (7). The quick clamping circuit quickly installs the vacuum proportional valve to be tested at the detection circuit with a quick clamping fixture. The detection circuit forms a working condition simulation environment for the vacuum proportional valve to be tested by simulating the gas production during the negative pressure formation process of the lithium battery, and detects the vacuum proportional valve to be tested. The detection scheme includes the static pressure regulation performance test of the valve body, the dynamic working condition pressure regulation performance test of the valve body, and the pressure holding performance and airtightness test of the valve body, which are executed in sequence.

[0008] The detection circuit includes a vacuum pump (10) and a positive pressure air source (1) communicated with an air storage tank (2). It also includes a three-way pipe joint (52). The positive pressure air source is connected to a triple air source processor (3) at a six-way manifold (4). The three-way pipe joint is connected to the vacuum pump through a detection circuit switch valve (41) and a detection circuit pneumatic on-off valve (9).

[0009] The quick clamping fixture includes a left fixture (6) and a right fixture (5) placed on both sides of the vacuum proportional valve to be tested. Three-way pipe joints (52) are provided at both the left fixture (6) and the right fixture (5) to communicate with the vacuum proportional valve to be tested.

[0010] When the detection circuit works, the gas generated by the positive pressure air source enters the air storage tank through a pipeline, and then enters the triple air source processor under the differential pressure of the vacuum pump to clean and filter the gas to remove the moisture in the air. The filtered air first enters the six-way manifold, then enters the three-way pipe joint at the right fixture, then enters the vacuum proportional valve to be tested, and then enters the three-way pipe joint at the left fixture from the vacuum port of the vacuum proportional valve to be tested. Finally, it is sent to the detection circuit pneumatic on-off valve (9) through a pipeline and then to the vacuum pump, and then discharged to the external atmosphere. A detection circuit air filling plug (42) is provided beside the detection circuit switch valve. An air storage tank pneumatic on-off valve (21) and an air storage tank air filling plug (22) are provided at the air storage tank.

[0011] The quick clamping circuit includes a solenoid valve group (12) communicated with a cylinder air source (13) and an ultra-thin cylinder (51). When the quick clamping circuit works, the gas of the cylinder air source is input into the solenoid valve group, modulated by the solenoid valve group and then input into the ultra-thin cylinder to make the cylinder plunger move along the stroke, driving the three-way pipe joint to expand and contract to realize the connection and disconnection of the three-way pipe joint and the vacuum proportional valve to be tested. The gas in the ultra-thin cylinder is discharged to the solenoid valve group and then discharged to the external atmosphere. Before using the detection system, first place the valve body to be detected on the placement position of the valve body to be detected marked on the positioning plate (8). After placement, use the host computer to control the opening of the air source of the cylinder, control the solenoid valve group to move the plunger of the ultra-thin cylinder, so that the three-way pipe joint on the plunger is connected to the left and right working ports of the valve to be detected, so that the quick clamping circuit completes the clamping of the valve to be detected, and seals it with the pipe joint rubber plug of the three-way pipe joint.

[0012] After the quick clamping circuit completes the clamping of the valve to be detected, first use the host computer to let the detection device enter the airtightness detection link. At this time, the positive pressure air source is closed, and all pneumatic on-off valves are closed to prevent air from entering the detection circuit from each air replenishing plug; The vacuum pump first evacuates the detection circuit to a vacuum. When the reading of the electronic digital display pressure gauge (44) drops to the preset negative pressure of -100Kpa, the vacuum pump stops working and maintains the process for a preset duration, about 1 minute. Observe the circuit pressure curve read from the electronic digital display pressure gauge from the host computer. If the curve slope is very small and the circuit remains vacuum as a whole, it is determined that the airtightness of the valve body to be detected and the detection system is good.

[0013] After it is determined that the airtightness of the valve body to be detected and the detection system is good, the detection device performs a static pressure regulation performance test on the valve to be detected at the quick clamping fixture. The host computer issues control instructions to the positive pressure air source and the vacuum pump to form a static pressure regulation performance test gas path for the valve body and provide different static pressures to the valve body to be detected. The gas flow path of the static pressure regulation performance test gas path for the valve body is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve to be detected -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, to determine whether the valve body to be detected can control the gas storage tank at the set pressure and flow rate settings. The gas path pressure data at the six-way manifold is regarded as the pressure of the gas storage tank. The pressure data is measured by the electronic digital display pressure gauge (44) at the gas path and transmitted to the host computer, and can be viewed at the host computer; If the valve to be detected has a use feedback adjustment or needs to receive pressure information, the aviation connector of the pressure transmitter (43) can be connected to the valve to be detected, and the pressure transmitter will also measure the pressure at the six-way manifold; then the pressure to be adjusted can be set through the host computer or the control box of the valve to be detected. The valve to be detected adjusts the pressure to the set pressure according to the signal. The host computer will record the pressure change curve and obtain the pressure adjustment time and oscillation amplitude of the valve to be detected to judge whether the static pressure regulation ability of the valve to be detected meets the standard.

[0014] After determining that the static pressure regulation ability of the valve under test meets the standard, the detection device performs a pressure regulation performance test on the valve under test at the quick clamping fixture. The host computer issues control commands to the positive pressure air source and the vacuum device to form a gas path for the pressure regulation performance test of the valve body under dynamic conditions and provide different dynamic pressures to the valve body under test. The pressure change of this dynamic pressure mimics the gas production pressure at each stage during the negative pressure forming process of the lithium battery cell. The gas flow path of the gas path for the pressure regulation performance test of the valve body under dynamic conditions is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve under test -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, to test whether the valve body under test can control the gas storage tank on the set pressure-time curve. The pressure data during the test is detected in real time by an electronic digital display pressure gauge and transmitted to the host computer, and can be viewed on the host computer; In this test, the target pressure-time curve to be adjusted is set through the host computer or the control box of the valve under test. The valve under test adjusts the pressure to the set pressure according to the signal. The host computer records the pressure change curve to obtain the pressure tracking ability, response speed, and tracking stability of the valve under test, so as to judge whether the pressure regulation performance of the valve body under dynamic conditions meets the standard.

[0015] After determining that the pressure regulation performance of the valve body under dynamic conditions meets the standard, the detection device performs a pressure holding performance and airtightness test on the valve under test at the quick clamping fixture. The host computer issues control commands to the positive pressure air source and the vacuum device to form a gas path for the pressure holding performance and airtightness test of the valve body and provide different static pressures to the valve body under test. The gas flow path of the gas path for the pressure holding performance and airtightness test of the valve body is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve under test -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source. The valve body under test needs to control the gas storage tank at the set pressure and hold the pressure for a preset duration. The host computer records the pressure change curve over time and judges the pressure holding ability through the slope. When detecting the airtightness, the system evacuates to the target value (such as -100 kPa), and the pressure rise amplitude is detected after pressure holding. The pressure data is detected in real time by an electronic digital display pressure gauge and transmitted to the host computer, and can be viewed on the host computer; In this test, a certain static pressure to be adjusted is set through the host computer or the control box of the valve under test. The valve under test adjusts the pressure to the set pressure according to the signal. The host computer records the pressure change curve to obtain the pressure holding ability of the valve under test and judges whether the pressure feedback value is within a certain limit. If it meets the requirements, it is determined that the pressure holding ability of the valve under test meets the standard.

[0016] The vacuum proportional valve to be tested is a vacuum proportional valve with two working ports; the detection device includes the following components: A vacuum device that provides a vacuum source and a stable negative pressure environment; A positive pressure air source that provides a positive pressure source for simulating gas production during the formation of the battery cell. A gas storage tank for simulating the gas capacitance of the battery cell. Two pneumatic on-off valves for quickly breaking vacuum to protect the detection device in case of a failure in the valve body or the detection device.

[0017] Two quick-clamping fixtures, consisting of a fixing plate, an ultra-thin cylinder, a three-way pipe joint, and a pipe joint rubber plug; the ultra-thin cylinder is fixed on the fixing plate; the cylinder plunger is connected to one end of the three-way pipe joint; The three outlets of the three-way pipe joint are sealed with rubber plugs. One of the two outlets is used to dock the valve body to be tested, and the other is connected to the gas storage tank and accesses the vacuum device through the air hole on-off valve; the three-way pipe joint is adapted to different valves to be tested by replacing different calibers; The ultra-thin cylinder is connected to the upper computer through a communication link and is controlled by the upper computer to drive the three-way pipe joint to expand and contract to perform on-off with the valve to be tested, forming a gas circuit; A six-way manifold for docking devices such as air pipes, pressure transmitters, digital display pressure sensors, and switching valves; A positioning plate for quickly positioning the position where the valve core should be placed; Two air replenishing plugs for replenishing air to the system at low vacuum levels, improving the system's response speed and reducing system oscillation, commonly found in the negative pressure formation system of lithium batteries; one is connected to the gas storage tank through the air hole on-off valve for air replenishment, and the other is connected to the six-way manifold through the switching valve for slowly breaking vacuum in case of system failure to protect the detection system and the valve to be tested; An electronic digital display pressure sensor is docked on the six-way manifold to measure the pressure before the valve. The pressure before the valve is also the pressure of the gas storage tank, and the pressure signal is sent to the upper computer; A pressure transmitter for measuring the pressure before the valve, which is also the pressure of the gas storage tank. The pressure transmitter has an aviation plug for communication, can communicate with the valve to be tested, and sends the measured pressure signal to the controller of the valve to be tested; A triple air source processor, that is, the air source triple unit F.R.L, which is a combination of three air source treatment components: an air filter (F), a pressure reducing valve (R), and an oiler (L); the air filter is used to clean the air source, avoiding moisture entering the detection device with the gas by filtering moisture in the compressed air; the pressure reducing valve stabilizes the air source pressure to keep it constant, reducing damage to valves or actuator hardware caused by sudden air pressure changes; the oiler lubricates the moving parts of the machine body, extending the service life of the machine body by lubricating parts that are not convenient to add lubricating oil; one end of the triple air source processor is connected to the gas storage tank through an air pipe, and the other end is connected to the six-way manifold through an air pipe; A cylinder air source for providing a power source for the ultra-thin cylinder; A group of solenoid valve sets, composed of several solenoid valves, air pipes, and bases, are connected to the cylinder air source and the air supply holes of the ultra-thin cylinders of two quick-clamping fixtures, and are used to control the stroke of the cylinder. A host computer, which is used to receive the signals of the electronic digital display pressure sensor, send flow signals to the positive pressure air source, simulate the gas production of the battery cell at each formation stage according to the set flow value, and provide pressure for the static performance test of the valve body.

[0018] The present invention provides a detection device for the pressure regulation performance of a vacuum proportional valve in the formation section of a lithium battery, which is used to simulate the environment during the negative pressure formation of a lithium battery cell, realize the accurate simulation of parameters such as gas pressure and flow rate during the battery formation process, and quickly and accurately detect the comprehensive performance of the vacuum proportional valve. The present invention can accurately simulate parameters such as air pressure and flow rate during the battery formation process, can detect the static performance of the vacuum proportional valve, and also has the advantages of being able to simulate the lithium battery formation process to detect the comprehensive performance of the valve body under actual working conditions.

[0019] The advantages of the present invention are as follows: 1. It can simulate the gas production of a lithium battery cell during the negative pressure formation process, realize the working condition simulation of the vacuum proportional valve during the battery formation process, and pre-check the comprehensive ability of the valve body before the valve is used for actual negative pressure formation operations, ensure that it can meet the requirements of negative pressure formation operations, reduce the time spent on experiments, and avoid losses caused by defective vacuum proportional valves entering the negative pressure formation operations. 2. It adopts quick-clamping fixtures, which greatly shortens the time for installing the valve on the detection device, can quickly form a circuit, and can also emergently disconnect the circuit when the valve fails. Ultra-thin cylinders are used to reduce the volume of the fixture, and a solenoid valve set is used to precisely control the cylinder stroke to adapt to valves of different volumes. 3. The detection device has multiple protection devices, which can quickly break the vacuum when a failure occurs, and reduce the probability of damage to the detection device and the valve when a failure occurs. Description of the Drawings

[0020] The following further details the present invention in conjunction with the drawings and specific embodiments: Figure 1 It is a schematic structural diagram of the detection device for the implementation of the present invention; Figure 2 It is a schematic hydraulic principle diagram of the detection device for the implementation of the present invention; In the figure: 1. Positive pressure air source; 2. Air storage tank; 21. Pneumatic on-off valve; 22. Air storage tank air replenishment plug; 3. Three-in-one air source processor; 4. Six-way manifold; 41. Switch valve; 42. Detection circuit air replenishment plug; 43. Pressure transmitter; 44. Electronic digital display pressure gauge; 5. Right clamp; 51. Ultra-thin cylinder; 52. Three-way pipe joint; 53. Pipe joint rubber plug; 54. Clamp fixing plate; 6. Left clamp; 7. Vacuum proportional valve to be tested; 8. Positioning plate; 9. Pneumatic on-off valve; 10. Vacuum device; 11. Solenoid valve group base; 12. Solenoid valve; 13. Cylinder air source. Specific implementation method

[0021] As shown in the figure, a detection device for the vacuum proportional valve in the lithium battery formation section is used to detect the pressure regulation performance of the vacuum proportional valve in the lithium battery formation section. It includes a host computer, a quick clamping circuit, and a detection circuit connected to the vacuum proportional valve 7 to be tested. The quick clamping circuit uses a quick clamping fixture to quickly install the vacuum proportional valve to be tested at the detection circuit. The detection circuit forms a working condition simulation environment for the vacuum proportional valve to be tested by simulating the gas production during the negative pressure formation process of the lithium battery, and detects the vacuum proportional valve to be tested. The detection scheme includes a valve body static pressure regulation performance test, a valve body dynamic working condition pressure regulation performance test, and a valve body pressure holding performance and airtightness test executed in sequence.

[0022] The detection circuit includes a vacuum device 10, a positive pressure air source 1 connected to the air storage tank 2, and also includes a three-way pipe joint 52. The positive pressure air source is connected to the three-in-one air source processor 3 at the six-way manifold 4; The three-way pipe joint is connected to the vacuum device through the detection circuit switch valve 41 and the detection circuit pneumatic on-off valve 9.

[0023] The quick clamping fixture includes a left clamp 6 and a right clamp 5 placed on both sides of the vacuum proportional valve to be tested. The left clamp 6 and the right clamp 5 are both provided with a three-way pipe joint 52 communicating with the vacuum proportional valve to be tested.

[0024] When the detection circuit works, the gas generated by the positive pressure air source enters the air storage tank through the pipeline, and then enters the three-in-one air source processor under the differential pressure of the vacuum device to clean and filter the gas to remove the moisture in the air; The filtered air first enters the six-way manifold, then enters the three-way pipe joint at the right clamp, then enters the vacuum proportional valve to be tested, and then enters the three-way pipe joint at the left clamp from the vacuum port of the vacuum proportional valve to be tested. Finally, it is sent to the vacuum device through the pipeline and the detection circuit pneumatic on-off valve 9 and discharged to the external atmosphere; A detection circuit air replenishment plug 42 is provided beside the detection circuit switch valve; An air storage tank pneumatic on-off valve 21 and an air storage tank air replenishment plug 22 are provided at the air storage tank.

[0025] The quick clamping circuit includes a solenoid valve group 12 communicated with the cylinder air source 13 and the ultra-thin cylinder 51; When the quick clamping circuit works, the gas from the cylinder air source is input into the solenoid valve group. After being modulated by the solenoid valve group, it is input into the ultra-thin cylinder to make the cylinder plunger move along the stroke, driving the three-way pipe joint to expand and contract, so as to realize the connection and disconnection between the three-way pipe joint and the vacuum proportional valve to be measured. The gas in the ultra-thin cylinder is discharged to the outside atmosphere after being discharged to the solenoid valve group; Before using the detection system, first place the valve body to be detected at the position of the valve body to be measured marked on the positioning plate 8. After placing it, use the upper computer to control the opening of the cylinder air source, control the solenoid valve group to make the plunger of the ultra-thin cylinder move, so that the three-way pipe joint on the plunger is connected to the left and right working ports of the valve to be measured, so that the quick clamping circuit completes the clamping of the valve to be measured, and seals it with the pipe joint rubber plug of the three-way pipe joint.

[0026] After the quick clamping circuit completes the clamping of the valve to be measured, first use the upper computer to make the detection device enter the airtightness detection link. At this time, the positive pressure air source is closed, and all pneumatic on-off valves are closed to prevent air from entering the detection circuit from each air replenishing plug; The vacuum pump first evacuates the detection circuit to a vacuum. When the reading of the electronic digital display pressure gauge 44 drops to the preset negative pressure of -100 Kpa, the vacuum pump stops working and maintains the process for a preset duration, about 1 minute. Observe the circuit pressure curve read from the electronic digital display pressure gauge from the upper computer. If the curve slope is very small and the circuit as a whole maintains a vacuum, it is determined that the airtightness of the valve body to be measured and the detection system is good.

[0027] After it is determined that the airtightness of the valve body to be measured and the detection system is good, the detection device performs a static pressure regulation performance test on the valve to be measured at the quick clamping fixture. The upper computer issues control instructions to the positive pressure air source and the vacuum pump to form a static pressure regulation performance test gas path for the valve body and provide different static pressures to the valve body to be measured. The gas flow path of the static pressure regulation performance test gas path for the valve body is positive pressure air source -> air storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve to be measured -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, so as to determine whether the valve body to be measured can control the air storage tank at the set pressure and flow rate settings. The air path pressure data at the six-way manifold is regarded as the pressure of the air storage tank. The pressure data is measured by the electronic digital display pressure gauge 44 at the air path and transmitted to the upper computer, and can be viewed at the upper computer; If the valve under test has feedback regulation or needs to receive pressure information, the aviation connector of the pressure transmitter 43 can be connected to the valve under test, and the pressure transmitter will also measure the pressure at the six-way manifold. Subsequently, the pressure to be set can be set through the host computer or the control box of the valve under test. The valve under test adjusts the pressure to the set pressure according to the signal, and the host computer will record the pressure change curve to obtain the pressure adjustment time and oscillation amplitude of the valve under test, so as to judge whether the static pressure regulation ability of the valve under test meets the standard.

[0028] After determining that the static pressure regulation ability of the valve under test meets the standard, the detection device performs a test on the valve under test at the quick clamping fixture for the pressure regulation performance of the valve body under dynamic conditions. The host computer issues control instructions to the positive pressure air source and the vacuum device to form a gas path for testing the pressure regulation performance of the valve body under dynamic conditions and provide different dynamic pressures to the valve body under test. The pressure change of this dynamic pressure imitates the gas production pressure in each section during the negative pressure formation process of the lithium battery cell. The gas flow path of the gas path for testing the pressure regulation performance of the valve body under dynamic conditions is: positive pressure air source -> gas storage tank -> triple gas source processor -> six-way manifold -> right side of the quick clamping fixture -> valve under test -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, so as to test whether the valve body under test can control the gas storage tank on the set pressure-time curve. The pressure data during the test is detected in real time by the electronic digital display pressure gauge and transmitted to the host computer, and can be viewed on the host computer. In this test, the target pressure-time curve to be set is set through the host computer or the control box of the valve under test. The valve under test adjusts the pressure to the set pressure according to the signal, and the host computer records the pressure change curve to obtain the pressure tracking ability, response speed and tracking stability of the valve under test, so as to judge whether the pressure regulation performance of the valve under test under dynamic conditions meets the standard.

[0029] After determining that the pressure regulation performance of the valve under test under dynamic conditions meets the standard, the detection device performs a test on the valve under test at the quick clamping fixture for the pressure holding performance and air tightness of the valve body. The host computer issues control instructions to the positive pressure air source and the vacuum device to form a gas path for testing the pressure holding performance and air tightness of the valve body and provide different static pressures to the valve body under test. The gas flow path of the gas path for testing the pressure holding performance and air tightness of the valve body is: positive pressure air source -> gas storage tank -> triple gas source processor -> six-way manifold -> right side of the quick clamping fixture -> valve under test -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source. The valve body under test needs to control the gas storage tank at the set pressure and hold the pressure for a preset duration. The host computer records the pressure change curve over time and judges the pressure holding ability through the slope. When detecting the air tightness, the system evacuates to the target value (such as -100 kPa), and the pressure rise amplitude is detected after pressure holding. The pressure data is detected in real time by the electronic digital display pressure gauge and transmitted to the host computer, and can be viewed on the host computer. In this test, a certain static pressure to be adjusted is set through the host computer or the control box of the valve under test. The valve under test adjusts the pressure to the set pressure according to the signal. The host computer will record the pressure change curve, obtain the pressure holding capacity of the valve under test, and determine whether the pressure feedback value is within a certain limit. If it meets the requirements, it is determined that the pressure holding capacity of the valve under test meets the standard.

[0030] The vacuum proportional valve to be tested is a vacuum proportional valve with two working ports; the detection device includes the following components: A vacuum pump, which provides a vacuum source and a stable negative pressure environment; A positive pressure gas source, which provides a positive pressure source and is used to simulate the gas production during the formation of the battery cells; A gas storage tank, which is used to simulate the gas capacitance of the battery cells; Two pneumatic on-off valves, which are used to quickly break the vacuum to protect the detection device in case of a failure in the valve body or the detection device.

[0031] Two quick-clamping fixtures, which are composed of a fixing plate, an ultra-thin cylinder, a three-way pipe joint, and a pipe joint rubber plug; the ultra-thin cylinder is fixed on the fixing plate; the cylinder plunger is connected to one end of the three-way pipe joint; The three outlets of the three-way pipe joint are sealed with rubber plugs. One of the two outlets is used to hold the valve body to be tested, and the other is connected to the gas storage tank and accesses the vacuum pump through the air hole on-off valve; the three-way pipe joint is adapted to different valves under test by replacing different calibers; The ultra-thin cylinder is connected to the host computer through a communication link and is controlled by the host computer to drive the three-way pipe joint to expand and contract to perform on-off with the valve under test, forming a gas circuit; A six-way manifold, which is used to connect devices such as air pipes, pressure transmitters, digital display pressure sensors, and switch valves; A positioning plate, which is used to quickly locate the position where the valve core should be placed; Two air replenishing plugs, which are used to replenish air to the system at low vacuum levels, improve the reaction speed of the system, and reduce system oscillation, which are commonly found in the negative pressure formation system of lithium batteries; one is connected to the gas storage tank through the air hole on-off valve for air replenishment, and the other is connected to the six-way manifold through the switch valve for slowly breaking the vacuum in case of system failure to protect the detection system and the valve to be tested; An electronic digital display pressure sensor, which is connected to the six-way manifold and is used to measure the pressure before the valve. The pressure before the valve is also the pressure of the gas storage tank, and it sends the pressure signal to the host computer; A pressure transmitter, which is used to measure the pressure before the valve, which is also the pressure of the gas storage tank. The pressure transmitter has an aviation plug for communication, can communicate with the valve under test, and sends the measured pressure signal to the controller of the valve under test; A triple air source processor, namely the air source triple unit (F.R.L), is a combination of three air source treatment components: an air filter F, a pressure reducing valve R, and an oiler L. The air filter is used to clean the air source by filtering out moisture in the compressed air to prevent moisture from entering the detection device along with the gas. The pressure reducing valve stabilizes the air source pressure to keep it constant, reducing damage to valves or actuator hardware caused by sudden air pressure changes. The oiler lubricates the moving parts of the machine body, extending the service life of the machine body by lubricating parts that are not easily lubricated with oil. One end of the triple air source processor is connected to the air storage tank through a trachea, and the other end is connected to a six-way manifold through a trachea. An air cylinder air source is used to provide a power source for an ultra-thin air cylinder. A set of solenoid valve groups, consisting of several solenoid valves, tracheas, and bases, is connected to the air cylinder air source and the air supply holes of the ultra-thin air cylinders of two quick clamping jigs, and is used to control the stroke of the air cylinder. A host computer is used to receive the signal from the electronic digital display pressure sensor, send a flow signal to the positive pressure air source, simulate the gas production of the battery cells at each formation stage according to the set flow value, and provide pressure for the static performance test of the valve body.

[0032] Embodiment: In this example, a device for detecting the pressure regulating performance of a vacuum proportional valve in the formation section of a lithium battery is proposed, which includes a vacuum pump, a positive pressure air source, an air storage tank, two pneumatic on-off valves, two quick clamping jigs, a six-way manifold, a positioning plate, two air supplement plugs, a vacuum proportional valve to be tested, an electronic digital display pressure sensor, a pressure transmitter, a triple air source processor, an air cylinder air source, a set of solenoid valve groups, and a host computer.

[0033] The air pressure circuit of the vacuum proportional valve detection device can be divided into two parts: the detection circuit and the quick clamping circuit. The detection circuit consists of a positive pressure air source 1, an air storage tank 2, a triple air source processor 3, a six-way manifold 4, the valve to be tested 7, a three-way pipe joint 52, a pipe joint rubber plug 53, a pneumatic on-off valve 9, a vacuum pump 10, an air supplement plug 42, and several connecting pipelines. The positive pressure air source 1 generates gas, which enters the air storage tank 2 through a pipeline and then enters the triple air source processor 3 under the pressure difference of the vacuum pump 10, where the gas is cleaned and filtered to remove moisture in the air. The filtered air enters the six-way manifold 4, then enters the three-way pipe joint 52 of the right jig, and then enters the valve to be tested 7. It enters the three-way pipe joint of the left jig 6 from the vacuum port of the valve to be tested through a pipeline, and finally passes through the pipeline and the air hole on-off valve 9 to the vacuum pump 10 and is discharged to the atmosphere.

[0034] The quick clamping circuit consists of a cylinder air source 13, a solenoid valve group 12, and an ultra-thin cylinder 51. The gas from the cylinder air source 13 enters the solenoid valve group 12, and after being modulated by the solenoid valve group 12, it is input into the cylinder 51, causing the cylinder plunger to move along the stroke. The gas in the cylinder 51 is discharged to the solenoid valve group 12 and then discharged to the atmosphere.

[0035] Before using the detection system, the valve body 7 to be detected needs to be placed on the positioning plate 8. The approximate placement position of the valve body is marked on the positioning plate 8. After placement, use the upper computer to control the opening of the cylinder air source 1, and control the solenoid valve 12 to move the plunger of the ultra-thin cylinder 51 so that the three-way pipe joint 52 on the plunger is connected to the left and right working ports of the valve 7 to be detected. The rubber plug 53 of the pipe joint will play a sealing role.

[0036] After the quick clamps 5 and 6 clamp the valve 7 to be detected, use the upper computer to let the detection device enter the airtightness detection link. At this time, the positive pressure air source 1 will not be opened, and all the air hole on-off valves 21 and 41 are closed to prevent air from entering the circuit from the air compensation plug. The vacuum pump 10 will work to evacuate the detection circuit to a vacuum. When the reading of the electronic digital display pressure gauge 44 drops to -100 Kpa, the vacuum pump 10 will also stop working. This process will be maintained for about 1 minute. Observe the circuit pressure curve read from the electronic digital display pressure gauge 44 from the upper computer. If the curve slope is very small and the circuit remains in a vacuum as a whole, it means that the airtightness of the valve body 7 to be detected and the detection system is good.

[0037] Subsequently, the static pressure regulation performance test stage can be entered. The positive pressure air source 1 starts to work and inputs gas into the circuit at a fixed volume flow rate. The vacuum pump 10 will maintain the vacuum pumping condition. At this time, the gas path is: positive pressure air source 1 - air storage tank 2 - triple air source processor 3 - six-way manifold 4 - right clamp 5 - valve 7 to be detected - left clamp 6 - air hole on-off valve 9 - vacuum pump 10. The electronic digital display pressure gauge 44 will display the pressure at the six-way manifold 4, and at the same time, it can also be considered as the pressure of the air storage tank 2 and output it to the upper computer. If the valve 7 to be detected has a feedback adjustment for use or needs to receive pressure information, the aviation connector of the pressure transmitter 43 can be connected to the valve 7 to be detected. The pressure transmitter 43 will also measure the pressure at the six-way manifold 4. Subsequently, the pressure to be set can be set through the upper computer or the control box of the valve 7 to be detected. The valve 7 to be detected adjusts the pressure to the set pressure according to the signal. The upper computer will record the pressure change curve and obtain the pressure adjustment time and oscillation amplitude of the valve 7 to be detected to judge whether the static pressure regulation ability of the valve 7 to be detected meets the standard.

[0038] After the static pressure regulation ability of the valve under test 7 meets the standard, it enters the dynamic working condition simulation stage. The positive pressure air source 1 will, according to the instructions of the upper computer, simulate the gas production of the battery cells during the negative pressure formation of lithium batteries. The volume flow rate of the produced gas will change according to different stages of the negative pressure formation of lithium batteries to approximate the actual working conditions, while the vacuum pump 10 maintains the vacuum. At this time, the gas path is: positive pressure air source 1 - air storage tank 2 - triple air source processor 3 - six-way manifold 4 - right fixture 5 - valve under test 7 - left fixture 6 - air hole on-off valve 9 - vacuum pump 10. By setting the target pressure-time curve to be adjusted through the upper computer or the control box of the valve under test 7, the valve under test 7 adjusts the pressure to the set pressure according to the signal. The upper computer records the pressure change curve to obtain the pressure tracking ability, response speed, and tracking stability of the valve under test 7, so as to judge whether the dynamic working condition pressure regulation performance of the valve under test 7 meets the standard.

[0039] After the dynamic working condition pressure regulation performance of the valve under test 7 meets the standard, it enters the pressure holding ability test stage to test the pressure holding ability of the valve body 7. The positive pressure air source 1 will change the volume flow rate of the produced gas from slow to fast according to the instructions of the upper computer, while the vacuum pump 10 maintains the vacuum. At this time, the gas circuit is: positive pressure air source 1 - air storage tank 2 - triple air source processor 3 - six-way manifold 4 - right fixture 5 - valve under test 7 - left fixture 6 - air hole on-off valve 9 - vacuum pump 10. By setting a certain static pressure to be adjusted through the upper computer or the control box of the valve under test 7, the valve under test adjusts the pressure to the set pressure according to the signal. The upper computer records the pressure change curve to obtain the pressure holding ability of the valve under test 7 and judge whether the pressure feedback value is within a certain limit. If it meets the requirements, the pressure holding ability of the valve under test 7 meets the standard.

Claims

1. A detection device for a vacuum proportional valve in the formation section of a lithium battery, which is used to detect the pressure regulation performance of the vacuum proportional valve in the formation section of the lithium battery, and is characterized in that: It includes a host computer, a quick clamping circuit, and a detection circuit communicating with the vacuum proportional valve to be tested (7). The quick clamping circuit uses a quick clamping fixture to quickly install the vacuum proportional valve to be tested at the detection circuit. The detection circuit forms a working condition simulation environment for the vacuum proportional valve to be tested by simulating the gas production during the negative pressure formation process of the lithium battery, and tests the vacuum proportional valve to be tested. The detection scheme includes successively performing the static pressure regulation performance test of the valve body, the dynamic working condition pressure regulation performance test of the valve body, and the pressure holding performance and air tightness test of the valve body.

2. The lithium battery formation section vacuum proportional valve detection device according to claim 1, characterized in that: The detection circuit includes a vacuum pump (10) and a positive pressure air source (1) communicating with an air storage tank (2), and further includes a three-way pipe joint (52). The positive pressure air source is connected to a three-way air source processor (3) at a six-way manifold (4); The three-way pipe joint is connected to the vacuum pump through a detection circuit switch valve (41) and a detection circuit pneumatic on-off valve (9).

3. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 2, characterized in that: The quick clamping fixture includes a left fixture (6) and a right fixture (5) disposed on both sides of the vacuum proportional valve to be tested. Three-way pipe joints (52) are provided at both the left fixture (6) and the right fixture (5) to communicate with the vacuum proportional valve to be tested.

4. A detection device for a vacuum proportional valve in the formation stage of a lithium battery according to claim 3, characterized in that: When the detection circuit is working, the gas generated by the positive pressure air source enters the air storage tank through a pipeline, and then enters the three-way air source processor under the pressure difference of the vacuum pump to clean and filter the gas to remove moisture in the air; The filtered air first enters the six-way manifold, then enters the three-way pipe joint at the right fixture, then enters the vacuum proportional valve to be tested, and then enters the three-way pipe joint at the left fixture through the vacuum port of the vacuum proportional valve to be tested. Finally, it is sent to the vacuum pump through a pipeline and the detection circuit pneumatic on-off valve (9) and then discharged to the external atmospheric environment; A detection circuit air replenishment plug is provided beside the detection circuit switch valve; An air storage tank pneumatic on-off valve (21) and an air storage tank air replenishment plug (22) are provided at the air storage tank.

5. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 1, characterized in that: The quick clamping circuit includes a solenoid valve group (12) communicating with a cylinder air source (13) and an ultra-thin cylinder (51); When the quick clamping circuit is working, the gas of the cylinder air source is input into the solenoid valve group, modulated by the solenoid valve group and then input into the ultra-thin cylinder to move the cylinder plunger along the stroke, driving the three-way pipe joint to expand and contract to realize the connection and disconnection of the three-way pipe joint and the vacuum proportional valve to be tested. The gas in the ultra-thin cylinder is discharged to the solenoid valve group and then discharged to the external atmospheric environment after that; Before using the detection system, first place the valve body to be tested at the position of the valve body to be tested marked on the positioning plate (8). After placement, use the host computer to control the opening of the cylinder air source, control the solenoid valve group to move the plunger of the ultra-thin cylinder, make the three-way pipe joint on the plunger access the left and right working ports of the valve to be tested, complete the clamping of the valve to be tested by the quick clamping circuit, and seal it with the pipe joint rubber plug of the three-way pipe joint.

6. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 5, characterized in that: After the quick clamping circuit completes the clamping of the valve to be tested, first use the host computer to make the detection device enter the air tightness detection link. At this time, the positive pressure air source is closed, and all pneumatic on-off valves are closed to prevent air from entering the detection circuit through each air replenishment plug; The vacuum device first evacuates the detection circuit to a vacuum. When the reading of the electronic digital pressure gauge (44) drops to the preset negative pressure, the vacuum device stops working and maintains the process for a preset duration. Observe the loop pressure curve read from the electronic digital pressure gauge on the upper computer. If the curve slope is very small and the loop remains in vacuum as a whole, it is determined that the airtightness of the valve body to be tested and the detection system is good.

7. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 6, characterized in that: After determining that the airtightness of the valve body to be tested and the detection system is good, the detection device performs a static pressure regulation performance test on the valve to be tested at the quick clamping fixture. The upper computer issues control instructions to the positive pressure air source and the vacuum device to form a static pressure regulation performance test gas path for the valve body and provide different static pressures to the valve body to be tested. The gas flow path of the static pressure regulation performance test gas path for the valve body is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve to be tested -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, to determine whether the valve body to be tested can control the gas storage tank at the set values of pressure and flow rate. The gas path pressure data at the six-way manifold is regarded as the pressure of the gas storage tank. The pressure data is measured by the electronic digital pressure gauge (44) at the gas path and transmitted to the upper computer, and can be viewed on the upper computer.

8. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 7, characterized in that: After determining that the static pressure regulation ability of the valve to be tested meets the standard, the detection device performs a dynamic working condition pressure regulation performance test on the valve to be tested at the quick clamping fixture. The upper computer issues control instructions to the positive pressure air source and the vacuum device to form a dynamic working condition pressure regulation performance test gas path for the valve body and provide different dynamic pressures to the valve body to be tested. The pressure change of this dynamic pressure mimics the gas production pressure in each section during the negative pressure formation process of the lithium battery cell. The gas flow path of the dynamic working condition pressure regulation performance test gas path for the valve body is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve to be tested -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source, to test whether the valve body to be tested can control the gas storage tank on the set pressure-time curve. The pressure data during the test process is detected in real time by the electronic digital pressure gauge and transmitted to the upper computer, and can be viewed on the upper computer.

9. The detection device for the vacuum proportional valve in the formation section of a lithium battery according to claim 8, wherein: After determining that the pressure regulation performance of the valve under test meets the standard under dynamic conditions, the detection device performs a body pressure holding performance and airtightness test on the valve under test at the quick clamping fixture. The upper computer issues control instructions to the positive pressure air source and the vacuum device to form a gas path for the body pressure holding performance and airtightness test and provide different static pressures to the valve body under test. The gas flow path of the gas path for the body pressure holding performance and airtightness test is: positive pressure air source -> gas storage tank -> triple air source processor -> six-way manifold -> right side of the quick clamping fixture -> valve under test -> left side of the quick clamping fixture -> air hole on-off valve -> vacuum source. The valve body under test needs to control the gas storage tank at the set pressure and hold the pressure for a preset duration. The upper computer records the pressure change curve over time and judges the pressure holding ability through the slope. When detecting airtightness, the system evacuates to the target value, and the pressure rise amplitude is detected after pressure holding. The pressure data is detected in real time by an electronic digital display pressure gauge and transmitted to the upper computer, and can be viewed on the upper computer.

10. A detection device for a vacuum proportional valve in the formation section of a lithium battery according to claim 5, characterized in that: The vacuum proportional valve to be tested is a vacuum proportional valve with two working ports; the detection device includes the following components: A vacuum device that provides a vacuum source and a stable negative pressure environment; A positive pressure air source that provides a positive pressure source and is used to simulate the gas production during the formation of the battery cell; A gas storage tank that is used to simulate the gas capacitance of the battery cell; Two pneumatic on-off valves that are used to quickly break the vacuum to protect the detection device in case of a valve body or detection device failure; Two quick clamping fixtures, which are composed of a fixed plate, an ultra-thin cylinder, a three-way pipe joint, and a pipe joint rubber plug; the ultra-thin cylinder is fixed on the fixed plate; the cylinder plunger is connected to one end of the three-way pipe joint; The three outlets of the three-way pipe joint are sealed with rubber plugs. One of the two outlets is used to hold the valve body to be tested, and the other is connected to the gas tank and accesses the vacuum device through the air hole on-off valve; the three-way pipe joint is adapted to different valves under test by replacing different calibers; The ultra-thin cylinder is connected to the upper computer through a communication link and is controlled by the upper computer to drive the three-way pipe joint to expand and contract to perform on-off with the valve under test and form a gas circuit; A six-way manifold that is used to dock devices such as air pipes, pressure transmitters, digital display pressure sensors, and switch valves; A positioning plate that is used to quickly locate the position where the valve core should be placed; Two air replenishing plugs that are used to replenish air to the system under low vacuum conditions, improve the reaction speed of the system, and reduce system oscillation, which are commonly found in the negative pressure formation system of lithium batteries; one is connected to the gas storage tank through the air hole on-off valve for air replenishment, and the other is connected to the six-way manifold through the switch valve for slowly breaking the vacuum in case of system failure to protect the detection system and the valve to be tested; An electronic digital display pressure sensor that is docked on the six-way manifold to measure the pressure in front of the valve. The pressure in front of the valve is also the pressure of the gas storage tank, and the pressure signal is sent to the upper computer; A pressure transmitter that is used to measure the pressure in front of the valve, which is also the pressure of the gas storage tank. The pressure transmitter has an aviation plug for communication, can communicate with the valve under test, and sends the measured pressure signal to the controller of the valve under test; A triple air source processor, namely the air source triple unit (F.R.L), is a combination of three air source treatment components: an air filter (F), a pressure reducing valve (R), and an oiler (L). The air filter is used to clean the air source and avoid moisture entering the detection device by filtering the moisture in the compressed air. The pressure reducing valve stabilizes the air source pressure to keep it constant, reducing damage to valve or actuator hardware caused by sudden air pressure changes. The oiler lubricates the moving parts of the machine body, extending the service life of the machine body by lubricating parts where it is inconvenient to add lubricating oil. One end of the triple air source processor is connected to the air storage tank through a trachea, and the other end is connected to a six-way manifold through a trachea. A cylinder air source, used to provide a power source for the ultra-thin cylinder. A set of solenoid valve groups, composed of several solenoid valves, tracheas, and bases, is connected to the cylinder air source and the air supply holes of the ultra-thin cylinders of two quick clamping jigs, and is used to control the stroke of the cylinder. A host computer, used to receive the signal of the electronic digital display pressure sensor, send a flow signal to the positive pressure air source, simulate the gas production of the battery cell at each formation stage according to the set flow value, and provide pressure for the static performance test of the valve body.

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