CN117990301B - Air tightness detection system - Google Patents

Air tightness detection system Download PDF

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Publication number
CN117990301B
CN117990301B CN202410404261.3A CN202410404261A CN117990301B CN 117990301 B CN117990301 B CN 117990301B CN 202410404261 A CN202410404261 A CN 202410404261A CN 117990301 B CN117990301 B CN 117990301B
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China
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valve
product
detected
gas
detection
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CN117990301A (en
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钟惠英
张宁
连登伟
周海伦
余应丰
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The embodiment of the application provides an airtight detection system. The airtight detection system comprises an air source, a detection component, a product to be detected and a detection chamber; the outlet end of the air source is connected with the inlet end of the detection assembly through a first valve; the inlet end of the product to be detected is connected with the outlet end of the detection assembly through a second valve, and the inlet end of the product to be detected is connected with the outlet end of the air source through a third valve; the inlet end of the detection chamber is connected with the outlet end of the product to be detected, the outlet end of the detection chamber is connected with the external environment through a fourth valve, and the detection chamber comprises a temperature controller for monitoring and adjusting the temperature of the gas in the product to be detected; the outlet end of the air source is provided with a first pressure regulating valve, and the outlet end of the air source is connected with the inlet end of the detection assembly through the first pressure regulating valve and the first valve in sequence, and the outlet end of the air source is connected with the inlet end of the product to be detected through the first pressure regulating valve and the third valve in sequence. Thus, the accuracy and the overall efficiency of the airtight detection are effectively improved.

Description

Air tightness detection system
Technical Field
The application relates to the technical field of airtight detection, in particular to an airtight detection system.
Background
Conventionally, the existing airtight test generally employs a positive pressure test, i.e., a test in which a product end is inflated with compressed air, and then whether the product leaks is determined by detecting the pressure loss of a standard chamber and the product end. However, the positive pressure detection is deeply affected by the ambient temperature, and the temperature difference between the product end and the environment easily causes low accuracy of the detection result.
Disclosure of Invention
The embodiment of the application provides an airtight detection system, which aims to solve the technical problem of low airtight detection accuracy.
An embodiment of the present application provides an airtight detection system, including:
The outlet end of the air source is connected with the inlet end of the detection assembly through a first valve;
The inlet end of the product to be detected is connected with the outlet end of the detection assembly through a second valve, and the inlet end of the product to be detected is connected with the outlet end of the air source through a third valve;
The inlet end of the detection chamber is connected with the outlet end of the product to be detected, the outlet end of the detection chamber is connected with the external environment through a fourth valve, and the detection chamber comprises a temperature controller for monitoring and adjusting the temperature of the gas in the product to be detected;
The outlet end of the air source is provided with a first pressure regulating valve, and the outlet end of the air source is connected with the inlet end of the detection assembly through the first pressure regulating valve and the first valve in sequence, and the outlet end of the air source is connected with the inlet end of the product to be detected through the first pressure regulating valve and the third valve in sequence.
Like this, through the exit end at the product of waiting to detect increases the detection room that is provided with the temperature controller, wait to detect the product and detect the room and carry out the gas replacement to can monitor and adjust the inside gas temperature of product of waiting to detect, reduce the influence of ambient temperature to the testing result, and can be through first air-vent valve, the inflation atmospheric pressure of flexible adjustment air supply can guarantee on the one hand that airtight detection is in a steady voltage environment, on the other hand can control inflation efficiency, thereby effectively improve airtight detection's accuracy and overall efficiency.
The accuracy of the detection result is effectively improved.
In some embodiments, the air tightness detection system further comprises:
The control equipment is in communication connection with the temperature controller, the first valve, the second valve, the third valve, the fourth valve and the first pressure regulating valve.
Thus, the temperature controller and the valve can be controlled to be opened or closed through the control equipment, and the air pressure value of the first pressure regulating valve is controlled, so that the intelligence and the convenience of air tightness detection are improved.
In some embodiments, the control device is configured to control the second valve to open, and the first valve, the third valve, and the fourth valve to close, so that the detection assembly, the product to be detected, and the detection chamber form a first loop, and the first loop is configured to perform temperature compensation on the temperature of the gas in the product to be detected;
the method for compensating the temperature of the gas in the product to be detected comprises the following steps:
When the temperature of the gas in the detection chamber is detected to be outside the target detection temperature, the control equipment controls the temperature controller to adjust the temperature of the gas in the detection chamber;
The gas with the temperature in the detection chamber adjusted is replaced with the gas in the product to be detected in real time, so that the temperature of the gas in the product to be detected is within the target detection temperature.
Therefore, when the temperature of the gas in the detection chamber is higher than or lower than the set target detection temperature, the refrigeration or heating mode of the temperature controller can be automatically started, the gas temperature in the detection chamber is reduced or improved, and the gas in the detection chamber and the gas of the product to be detected are replaced in real time, so that the temperature in the product to be detected is close to the target detection temperature, and the accuracy of the detection result is improved.
In some embodiments, the outlet end of the air source is further provided with a second pressure regulating valve and a fifth valve, the air source is connected with the inlet end of the product to be detected through the second pressure regulating valve, the fifth valve and the second valve in sequence, and the second pressure regulating valve and the fifth valve are in communication connection with the control equipment;
wherein, the adjustable air pressure value of the first pressure regulating valve is smaller than the adjustable air pressure value of the second pressure regulating valve.
Therefore, the high-pressure channel can be used for exhausting and pre-charging the detection chamber, the function of rapid exhausting and charging is realized, the overall efficiency of airtight detection is improved, and the low-pressure channel can be used for charging at normal pressure, so that airtight detection is ensured to be in a pressure-stabilizing environment, and the reliability and accuracy of airtight detection are improved. In other words, by providing the high-pressure passage and the low-pressure passage, the accuracy requirement and the efficiency requirement of the airtight detection can be satisfied at the same time.
In some embodiments, the detection assembly comprises:
The leak detector is connected with the inlet end of the product to be detected through a second valve;
The inlet end of the standard chamber is connected with the leak detector, the outlet end of the standard chamber sequentially passes through a sixth valve and a second valve and is connected with the inlet end of a product to be detected, and the sixth valve is in communication connection with the control equipment.
In this way, the airtight detection function can be achieved by monitoring the pressure difference between the product to be detected and the standard chamber by the leak detector.
In some embodiments, the control device is configured to control the second valve and the fifth valve to be opened, and the first valve, the third valve, the fourth valve, and the sixth valve to be closed, so that the gas source, the product to be detected, and the detection chamber form a second loop, and the second loop is configured to pre-charge the gas pressure of the gas in the product to be detected to a preset cutoff gas pressure.
Therefore, the higher air pressure can be used for pre-filling the air pressure of the air in the product to be detected to the preset cut-off air pressure, so that the air filling efficiency can be improved, and the overall efficiency of airtight detection is improved.
In some embodiments, the control device is configured to control the first valve, the second valve, and the sixth valve to be opened, and the third valve, the fourth valve, and the fifth valve to be closed, so that the gas source, the standard chamber, the product to be detected, and the detection chamber form a third loop, and the third loop is configured to inflate the gas pressure of the gas in the product to be detected from a preset cutoff gas pressure to a target detection gas pressure.
Therefore, the lower air pressure can be used for inflating the air pressure of the air in the product to be detected from the preset cut-off air pressure to the target detection air pressure, the air pressure in the system can be ensured to be stable, and the reliability and the accuracy of airtight detection are improved.
In some embodiments, the control device is configured to control the second valve, the fourth valve, and the fifth valve to be opened, and the first valve, the third valve, and the sixth valve to be closed, so that the gas source, the product to be detected, and the detection chamber form a fourth loop, and the fourth loop is configured to keep the product to be detected consistent with the gas state in the detection chamber.
In this way, the product to be detected and the gas state in the detection chamber can be kept consistent, so that the accuracy of the detection result is further improved.
In some embodiments, the control device is configured to control the second valve to open, and the first valve, the third valve, the fourth valve, the fifth valve, and the sixth valve to close, so that the product to be detected and the detection chamber form a fifth loop, and the fifth loop is configured to detect whether the product to be detected leaks.
In this way, the airtight detection function can be achieved by monitoring the pressure difference between the product to be detected and the standard chamber by the leak detector.
In some embodiments, the control device is configured to control the third valve and the fourth valve to open, and the first valve, the second valve, the fifth valve, and the sixth valve to close, such that the product to be tested and the resulting test chamber form a sixth circuit, the sixth circuit being configured to vent the product to be tested and the test chamber.
In this way, after the airtight detection is finished, the product 3 to be detected, the detection chamber 4 and the pipeline can be exhausted, so that the aim of maintaining the airtight detection system is fulfilled.
In some embodiments, the detection chamber comprises a pressure sensor in communication with the control device for monitoring the gas pressure of the gas in the product to be detected.
Thus, the air pressure in the product to be detected can be reflected more accurately by the air pressure value detected by the pressure sensor in the detection chamber, and the accuracy of airtight detection is further improved.
In some embodiments, the detection chamber comprises a humidity sensor in communication with the control device for monitoring the humidity of the gas in the product to be detected.
Therefore, the humidity of the gas in the product to be detected can be monitored through the humidity sensor of the detection chamber, the influence of the external environment humidity on the airtight detection result is reduced, and the accuracy of airtight detection is further improved.
In some embodiments, the detection chamber includes a volatile organic compound sensor in communication with the control device for monitoring the concentration of the gaseous medium in which the electrolyte is volatilized in the product to be detected.
Therefore, the airtight detection system can realize the airtight detection function, the battery cell leakage detection function and more comprehensive functions.
In some embodiments, the detection chamber is provided with an insulating layer.
Therefore, the gas in the detection chamber can be further prevented from being influenced by external environmental factors, and the accuracy of data detected by the detection chamber is ensured.
In some embodiments, the first connecting pipeline of the product to be detected and the detection chamber is larger in diameter than the second connecting pipeline and smaller in length than the second connecting pipeline, wherein the second connecting pipeline is other connecting pipelines except the product to be detected and the detection chamber in the airtight detection system.
In this way, the airtight detection function can be achieved by monitoring the pressure difference between the product to be detected and the standard chamber by the leak detector.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an airtight detecting system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another embodiment of an airtight detection system according to the present application;
FIG. 3 is a schematic diagram of another embodiment of an airtight detecting system according to the present application;
FIG. 4 is a schematic diagram of the gas circuit in the exhaust phase of the detection chamber according to the embodiment of the present application;
FIG. 5 is a schematic diagram of a high pressure pre-charge stage according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the gas circuit during the normal pressure inflation phase provided by the embodiment of the application;
FIG. 7 is a schematic diagram of a gas circuit in a voltage stabilization stage according to an embodiment of the present application;
FIG. 8 is a schematic diagram of the gas circuit during the testing phase provided by the embodiment of the application;
FIG. 9 is a schematic diagram of the gas circuit during the exhaust phase provided by an embodiment of the present application;
Fig. 10 is a schematic flow chart of the airtight detection system according to the embodiment of the present application.
Reference numerals:
1. A gas source; 2. a detection assembly; 21. a leak detector; 22. a standard room; 3. a product to be detected; 4. a detection chamber; 41. a temperature controller; 42. a pressure sensor; 43. a humidity sensor; 44. a volatile organic compound sensor; 5. a control device;
101. a first valve; 102. a second valve; 103. a third valve; 104. a fourth valve; 105. a fifth valve; 106. a sixth valve;
201. a first pressure regulating valve; 202. and a second pressure regulating valve.
In the drawings, the drawings are not drawn to scale.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.
The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.
With reference to fig. 1, fig. 1 is a schematic diagram of an airtight detection system according to some embodiments of the present application, where the airtight detection system may include:
the air source 1 and the detection assembly 2, wherein the outlet end of the air source 1 is connected with the inlet end of the detection assembly 2 through a first valve 101;
the product 3 to be detected, wherein the inlet end of the product 3 to be detected is connected with the outlet end of the detection assembly 2 through the second valve 102, and the inlet end of the product 3 to be detected is connected with the outlet end of the air source 1 through the third valve 103;
The detecting chamber 4, the inlet end of the detecting chamber 4 is connected with the outlet end of the product 3 to be detected, the outlet end of the detecting chamber 4 is connected with the external environment through a fourth valve 104, and the detecting chamber 4 comprises a temperature controller 41 for monitoring and adjusting the temperature of the gas in the product 3 to be detected;
The outlet end of the air source 1 is provided with a first pressure regulating valve 201, and the outlet end of the air source 1 is connected with the inlet end of the detection assembly 2 through the first pressure regulating valve 201 and the first valve 101 in sequence, and the outlet end of the air source 1 is connected with the inlet end of the product 3 to be detected through the first pressure regulating valve 201 and the third valve 103 in sequence.
As shown in fig. 1, the airtight inspection system may include an air source 1, an inspection assembly 2, a product 3 to be inspected, and an inspection chamber 4 connected in sequence through pipes. Wherein, be provided with first valve 101 between the exit end of air supply 1 and the entry end of detection subassembly 2, first valve 101 is used for controlling the intercommunication state between air supply 1 and the detection subassembly 2. A second valve 102 is arranged between the inlet end of the product 3 to be detected and the outlet end of the detection assembly 2, and the second valve 102 is used for controlling the communication state between the product 3 to be detected and the detection assembly 2.
In addition, the inlet end of the product 3 to be detected can also be directly connected with the outlet end of the air source 1 through a pipeline. A third valve 103 is arranged between the inlet end of the product 3 to be detected and the outlet end of the air source 1, and the third valve 103 is used for controlling the communication state between the air source 1 and the product 3 to be detected. The outlet end of the detection chamber 4 can be connected with the external environment, and a fourth valve 104 is provided, and the fourth valve 104 is used for controlling the communication state of the detection chamber 4 and the external environment.
The outlet end of the air source 1 may also be provided with a first pressure regulating valve 201, the first pressure regulating valve 201 may be located on the same channel with the first valve 101 and the third valve 103, and the first pressure regulating valve 201 is located before the first valve 101 and the third valve 103. The first pressure regulating valve 201 may be used to regulate the inflation pressure of the gas flowing from the gas source 1.
The temperature controller 41 is disposed in the detecting chamber 4, and the temperature controller 41 can monitor and adjust the temperature of the gas in the detecting chamber 4, because the product 3 to be detected is in communication with the detecting chamber 4, i.e. gas replacement can be implemented between the product 3 to be detected and the detecting chamber 4, and therefore the temperature controller 41 can also be used for monitoring and adjusting the temperature of the gas in the product 3 to be detected.
It will be appreciated that the first valve 101, the second valve 102, the third valve 103 and the fourth valve 104 may be mechanical valves, and the temperature controller 41 and the first pressure regulating valve 201 may be mechanical key structures, and the open or closed states thereof may be manually controlled.
The first valve 101, the second valve 102, the third valve 103, the fourth valve 104, the temperature controller 41 and the first pressure regulating valve 201 may be electromagnetic structures, and controlled by electric signals.
In some embodiments, the airtight detection system may further comprise a control device 5, such as a host computer. The control device 5 may be connected to the thermostat 41, the first valve 101, the second valve 102, the third valve 103, the fourth valve 104 and the first pressure regulating valve 201 in a wired or wireless manner. The control device 5 can control the opening or closing states of the first valve 101, the second valve 102, the third valve 103 and the fourth valve 104, the control device 5 can also control the temperature controller 41 to open the temperature regulating function of refrigeration or heating, and the control device 5 can also control the first pressure regulating valve 201 to regulate the charging pressure of the gas flowing out from the gas source 1. Thereby improving the intelligence and convenience of airtight detection. The scheme of airtight detection according to the embodiment of the present application will be described below taking the control of the thermostat 41, the first valve 101, the second valve 102, the third valve 103 and the fourth valve 104 by the control device 5 as an example.
During the airtight inspection, the inspection chamber 4 may be first entered into an exhaust stage, and the control device 5 may control the third valve 103 and the fourth valve 104 to be opened, and the first valve 101 and the second valve 102 to be closed, so that the air source 1, the product 3 to be inspected, and the inspection chamber 4 form an exhaust circuit of the inspection chamber 4, for example. At this time, the air source 1 can introduce air into the product 3 to be detected, and the air of the product 3 to be detected can be introduced into the detection chamber 4 in real time and then discharged to the external environment. After the preset time, the next stage is carried out, and the original residual gas in the product 3 to be detected and the detection chamber 4 can be displaced and discharged, so that the gas state of the product 3 to be detected is consistent with the gas state of the detection chamber 4.
The inflation phase may then be entered, for example, the control device 5 may control the first valve 101 and the second valve 102 to open and the third valve 103 and the fourth valve 104 to close, so that the gas source 1, the detection assembly 2, the product 3 to be detected and the detection chamber 4 form an inflation circuit. The air source 1 is used for introducing air into the detection assembly 2 and the product 3 to be detected, the air of the product 3 to be detected can be introduced into the detection chamber 4 in real time, after the preset time, the air states in the whole loop tend to be consistent, and the air pressure detected by the detection assembly 2 can be used as the air pressure of the air in the product 3 to be detected at the moment. When the detected air pressure reaches the target detected air pressure, the next stage may be entered. The inflation pressure P1 is known, and the standard chamber 22 volume V1, the product to be detected 3 volume V2, the detection chamber 4 volume V3, and the target inflation pressure P2 in the detection assembly 2 are set to obtain p2=p1v1/(v1+v2+v3).
The voltage stabilization phase may then be entered. In some embodiments, the control device 5 may be configured to control the second valve 102 to open, and the first valve 101, the third valve 103, and the fourth valve 104 to close, so that the detection assembly 2, the product to be detected 3, and the detection chamber 4 form a first loop, and the first loop is configured to perform temperature compensation on the gas temperature in the product to be detected 3;
Wherein, carry out temperature compensation to the gas temperature in the product 3 to be detected, include:
In the case where it is detected that the temperature of the gas in the detection chamber 4 is outside the target detection temperature, the control device 5 may control the temperature controller 41 to perform temperature adjustment of the gas in the detection chamber 4;
The gas in the detection chamber 4 after temperature adjustment is replaced with the gas in the product 3 to be detected in real time, so that the temperature of the gas in the product 3 to be detected is within the target detection temperature.
For example, the control device 5 may control the second valve 102 to be opened, the first valve 101, the third valve 103 and the fourth valve 104 to be closed, balance the air pressures of the detection assembly 2, the product 3 to be detected and the detection chamber 4 reaching the target detection air pressure, and when the detection assembly 2 monitors that the pressure has not changed, control the temperature controller 41 to adjust the temperature of the gas in the product 3 to be detected until the temperature of the gas in the product 3 to be detected is the target detection temperature, and then enter the next stage. For example, the temperature controller 41 in the detecting chamber 4 can monitor the gas temperature inside the product 3 to be detected in real time, and when the temperature is higher or lower than the set target detecting temperature, the cooling or heating mode is automatically started to reduce or increase the gas temperature in the detecting chamber 4 and replace the gas in the product 3 to be detected in real time, so that the temperature inside the product 3 to be detected approaches the target detecting temperature, and the accuracy of the detecting result is improved.
The testing stage may then be entered and it may be determined whether the product 3 to be tested is leaking gas based on the air pressure difference detected by the detecting assembly 2. For example, if the product 3 to be detected leaks, the pressure is reduced, a pressure difference is formed between the product 3 to be detected and the standard chamber 22 in the detection assembly 2, the pressure difference can be monitored, the leakage value is output and fed back to the control device 5, if the leakage value exceeds the preset specification range, the product 3 to be detected can be considered to leak air, the product 3 to be detected needs to be returned to the factory for maintenance, and if the leakage value is within the preset specification range, the product 3 to be detected can be considered to be airtight, and the detection is passed.
In some examples, in order to make the gas pressure inside the gas tightness detection system more stable, when the gas needs to be introduced into the product 3 to be detected, the gas pressure of the gas to be inflated can be adjusted to a lower gas pressure value, for example, 3.0kPa, through the first pressure regulating valve 201, so as to ensure that the subsequent gas tightness detection is in a stable pressure environment, thereby improving the reliability and accuracy of the gas tightness detection.
In other examples, in order to improve the efficiency of airtight detection, in the exhaust stage of the detection chamber 4, the inflation pressure may be adjusted to a higher pressure value, for example, 30 to 50kpa, by the first pressure regulating valve 201, so as to achieve the purpose of quickly displacing and exhausting the original residual gas in the product 3 to be detected and the detection chamber 4. In the inflation stage, the inflation pressure may be adjusted to a higher pressure value, for example, 10 to 30kpa, by the first pressure adjusting valve 201, so that the pressure of the gas in the product 3 to be detected reaches the preset cut-off pressure. And then the first pressure regulating valve 201 is used for regulating the inflation pressure to a lower pressure value, for example, 3.0-3.5 kPa, and continuously introducing gas into the product 3 to be detected until the gas pressure in the product 3 to be detected reaches the target detection pressure, so that the follow-up airtight detection is ensured to be in a pressure stabilizing environment, and the reliability and accuracy of the airtight detection are improved.
In some examples, after the airtight detection is completed, the control device 5 may further control the third valve 103 and the fourth valve 104 to be opened, the first valve 101 and the second valve 102 to be closed, and the product 3 to be detected and the detection chamber 4 to be exhausted, and the detection assembly 2 to be not exhausted.
Like this, through the detection room 4 that is provided with temperature controller 41 in the exit end of waiting to detect product 3 increase, wait to detect product 3 and detect room 4 and carry out the gas replacement to can monitor and adjust the inside gas temperature of waiting to detect product 3, reduce the influence of ambient temperature to the testing result, and can be through first air-vent valve 201, flexible adjustment air supply 1's inflation atmospheric pressure, on the one hand can guarantee that airtight detection is in a steady voltage environment, on the other hand can control inflation efficiency, thereby effectively improve airtight detection's accuracy and overall efficiency.
In some embodiments, the outlet end of the air source 1 is further provided with a second pressure regulating valve 202 and a fifth valve 105, the air source 1 is connected with the inlet end of the product 3 to be detected through the second pressure regulating valve 202, the fifth valve 105 and the second valve 102 in sequence, and the second pressure regulating valve 202 and the fifth valve 105 are in communication connection with the control device 5;
Wherein the adjustable air pressure value of the first pressure regulating valve 201 is smaller than the adjustable air pressure value of the second pressure regulating valve 202.
In this embodiment, as shown in fig. 3, the outlet end of the air source 1 may be further provided with a second pressure regulating valve 202 and a fifth valve 105, and the air source 1 may be connected to the inlet end of the product 3 to be detected through the second pressure regulating valve 202, the fifth valve 105 and the second valve 102 in sequence. In other words, the second pressure regulating valve 202 and the first pressure regulating valve 201 may be in different channels. The second pressure regulating valve 202 and the fifth valve 105 may also be in communication with the control device 5, the fifth valve 105 may also be used to control the communication between the gas source 1 and the product 3 to be tested, and the second pressure regulating valve 202 may also be used to regulate the inflation pressure of the gas flowing from the gas source 1.
Wherein the adjustable air pressure value of the first pressure regulating valve 201 is smaller than the adjustable air pressure value of the second pressure regulating valve 202. For example, the first pressure regulating valve 201 may be a low pressure regulating valve, the adjustable air pressure value may be 0 to 3.5kpa, the second pressure regulating valve 202 may be a high pressure regulating valve, and the adjustable air pressure value may be 0 to 50kpa. It will be appreciated that when high pressure inflation is required, the air source 1 may inflate the product 3 to be tested through the passageway in which the second pressure regulating valve 202 is located, and when low pressure inflation is required, the air source 1 may inflate the product 3 to be tested through the passageway in which the first pressure regulating valve 201 is located.
For example, as shown in fig. 4, in the exhaust stage of the detection chamber 4, the control device 5 may control the second valve 102, the fourth valve 104 and the fifth valve 105 to be opened, the first valve 101 and the third valve 103 to be closed, at this time, the gas in the gas source 1 adjusts the inflation pressure through the second pressure adjusting valve 202, for example, 50kPa, to supply the gas to the product 3 to be detected, and the gas of the product 3 to be detected may be supplied to the detection chamber 4 in real time and then discharged to the external environment.
The aeration stage can be divided into a high-pressure pre-aeration stage and a normal-pressure aeration stage. As shown in fig. 5, in the high-pressure pre-charging stage, the control device 5 may control the second valve 102 and the fifth valve 105 to be opened, the first valve 101, the third valve 103 and the fourth valve 104 to be closed, the gas in the gas source 1 is adjusted to the first charging pressure by the second pressure regulating valve 202, for example, 30kPa, the gas is introduced into the product 3 to be detected, and the gas of the product 3 to be detected may be introduced into the detection chamber 4 in real time until the pressure of the gas in the product 3 to be detected is a preset cut-off pressure. The preset cutoff air pressure may be set according to actual requirements, for example, the preset cutoff air pressure may be 3.5kPa, which is not particularly limited herein.
As shown in fig. 6, in the normal pressure inflation stage, the control device 5 may control the first valve 101 and the second valve 102 to be opened, and the third valve 103, the fourth valve 104 and the fifth valve 105 to be closed, so that the gas in the gas source 1 is adjusted to the second inflation pressure, for example, 3.0kPa, by the first pressure regulating valve 201, the gas is introduced into the product 3 to be detected, and the gas of the product 3 to be detected may be introduced into the detection chamber 4 in real time until the gas pressure of the gas in the product 3 to be detected is the target detection gas pressure.
Therefore, the high-pressure channel can be used for exhausting and pre-charging the detection chamber 4, the function of rapid exhausting and charging is realized, the overall efficiency of airtight detection is improved, and the low-pressure channel can be used for charging at normal pressure, so that airtight detection is ensured to be in a stable pressure environment, and the reliability and accuracy of airtight detection are improved. In other words, by providing the high-pressure passage and the low-pressure passage, the accuracy requirement and the efficiency requirement of the airtight detection can be satisfied at the same time.
In some embodiments, the detection chamber 4 comprises a pressure sensor 42, the pressure sensor 42 being in communication with the control device 5 for monitoring the gas pressure of the gas in the product 3 to be detected.
In this embodiment, as shown in fig. 1 to 3, the detection chamber 4 may also be provided with a pressure sensor 42, the pressure sensor 42 being in communication with the control device 5 and being adapted to monitor the gas pressure of the gas in the product 3 to be detected.
It will be appreciated that during the above-described airtight detection process, the gas pressure inside the product 3 to be detected can be monitored in real time by the detection assembly 2. Or may be monitored jointly by the sensing assembly 2 and the pressure sensor 42 in the sensing chamber 4. Because the detection component 2 is far from the product 3 to be detected compared with the detection chamber 4, whether the gas pressure in the product 3 to be detected reaches the preset cut-off gas pressure or the target detection gas pressure can be reflected more accurately by the gas pressure value detected by the pressure sensor 42, and the accuracy of the airtight detection is further improved.
In some embodiments, the detection chamber 4 comprises a humidity sensor 43, the humidity sensor 43 being in communication with the control device 5 for monitoring the humidity of the gas in the product 3 to be detected.
In this embodiment, as shown in fig. 1 to 3, the detecting chamber 4 may be further provided with a humidity sensor 43, and the humidity sensor 43 is communicatively connected to the control device 5 and may be used for monitoring the humidity of the gas in the product 3 to be detected.
In the steady voltage stage, after the temperature of the gas in the product to be detected 3 approaches the target detection temperature, whether the humidity of the gas in the product to be detected 3 meets the air tightness detection requirement can be judged through the humidity sensor 43, if not, prompt information can be output through the control equipment 5 to remind that the current humidity is not suitable for air tightness detection, and gas replacement can be performed through circulation until the humidity of the gas in the product to be detected 3 meets the air tightness detection requirement.
In this way, the humidity of the gas in the product 3 to be detected can be monitored by the humidity sensor 43 of the detection chamber 4, the influence of the external environment humidity on the airtight detection result is reduced, and the accuracy of the airtight detection is further improved.
In some embodiments, the detection chamber 4 comprises a volatile organic compound sensor 44, the volatile organic compound sensor 44 being in communication with the control device 5 for monitoring the concentration of the gaseous medium in which the electrolyte in the product 3 to be detected volatilizes.
In this embodiment, as shown in fig. 1 to 3, the detecting chamber 4 may further be provided with a volatile organic compound sensor 44, where the volatile organic compound sensor 44 is communicatively connected to the control device 5, and the volatile organic compound sensor 44 may monitor the concentration of the gaseous medium in which the electrolyte in the product 3 to be detected volatilizes, so as to determine whether the cell leakage phenomenon exists inside the product 3 to be detected.
Therefore, the airtight detection system can realize the airtight detection function, the battery cell leakage detection function and more comprehensive functions.
In some embodiments, the detection assembly 2 comprises:
the leak detector 21 is connected with the inlet end of the product 3 to be detected through the second valve 102;
The inlet end of the standard chamber 22 is connected with the leak detector 21, the outlet end of the standard chamber 22 is connected with the inlet end of the product 3 to be detected through a sixth valve 106 and a second valve 102 in sequence, and the sixth valve 106 is connected with the control device 5 in a communication way.
In this embodiment, as shown in fig. 2 and 3, the detecting assembly 2 may include a leak detector 21 and a standard chamber 22, where the leak detector 21 may be connected to an inlet end of the product 3 to be detected through a second valve 102, the inlet end of the standard chamber 22 is connected to the leak detector 21, and an outlet end of the standard chamber 22 is connected to an inlet end of the product 3 to be detected through a sixth valve 106, the second valve 102, and the sixth valve 106 is in communication with the control device 5.
In this way, the airtight detection function can be achieved by monitoring the pressure difference between the product 3 to be detected and the standard chamber 22 by the leak detector 21.
In some embodiments, the control device 5 may be configured to control the second valve 102, the fourth valve 104 and the fifth valve 105 to be opened, and the first valve 101, the third valve 103 and the sixth valve 106 to be closed, so that the gas source 1, the product 3 to be detected and the detection chamber 4 form a fourth circuit, and the fourth circuit is configured to keep the gas state of the product 3 to be detected consistent with that in the detection chamber 4.
For example, as shown in fig. 4, in the exhaust stage of the detection chamber 4, the control device 5 may control the second valve 102, the fourth valve 104 and the fifth valve 105 to be opened, the first valve 101, the third valve 103 and the sixth valve 106 to be closed, at this time, the gas in the gas source 1 adjusts the inflation pressure through the second pressure adjusting valve 202, for example, 50kPa, to supply the gas to the product 3 to be detected, and the gas of the product 3 to be detected may be supplied to the detection chamber 4 in real time and then discharged to the external environment. The original gas in the product 3 to be detected and the detection chamber 4 can be rapidly discharged at this stage, so that the gas state of the product 3 to be detected is ensured to be consistent with the gas state in the detection chamber 4.
In this way, the product 3 to be detected can be kept consistent with the gas state in the detection chamber 4, thereby further improving the accuracy of the detection result.
In some embodiments, the control device 5 may be configured to control the second valve 102 and the fifth valve 105 to be opened, and the first valve 101, the third valve 103, the fourth valve 104, and the sixth valve 106 to be closed, so that the gas source 1, the product to be detected 3, and the detection chamber 4 form a second loop, and the second loop is configured to pre-charge the gas pressure of the gas in the product to be detected 3 to a preset cut-off gas pressure.
As shown in fig. 5, in the high-pressure pre-charging stage, the control device 5 may control the second valve 102 and the fifth valve 105 to be opened, the first valve 101, the third valve 103, the fourth valve 104 and the sixth valve 106 to be closed, the gas in the gas source 1 is adjusted to the first inflation pressure by the second pressure regulating valve 202, for example, 30kPa, the gas is introduced into the product 3 to be detected, and the gas of the product 3 to be detected may be introduced into the detection chamber 4 in real time until the gas pressure of the gas in the product 3 to be detected is a preset cut-off gas pressure. After the pressure sensor 42 detects that the pressure of the product 3 to be detected reaches the preset cut-off pressure, if the pressure reaches 3.5kPa, the control device 5 may control the fifth valve 105 to be closed, send a signal to the first pressure regulating valve 201, and open the normal pressure charging stage.
Therefore, the higher air pressure can be used for pre-charging the air pressure of the air in the product 3 to be detected to the preset cut-off air pressure, so that the air charging efficiency can be improved, and the overall efficiency of airtight detection is improved.
In this stage, the product 3 to be detected can be rapidly inflated to the target pressure, so that the inflation rate is increased, but the high pressure can make the internal air pressure of the product 3 to be detected unstable, so that the airtight detection is inaccurate, and normal pressure inflation is needed to be used for further pressure stabilization.
In some embodiments, the control device 5 may further be configured to control the first valve 101, the second valve 102 and the sixth valve 106 to be opened, and the third valve 103, the fourth valve 104 and the fifth valve 105 to be closed, so that the gas source 1, the standard chamber 22, the product 3 to be detected and the detection chamber 4 form a third circuit, and the third circuit is configured to inflate the gas pressure in the product 3 to be detected from a preset cut-off gas pressure to a target detection gas pressure.
As shown in fig. 6, in the normal pressure inflation stage, the control device 5 may control the first valve 101, the second valve 102 and the sixth valve 106 to be opened, the third valve 103, the fourth valve 104 and the fifth valve 105 to be closed, the gas in the gas source 1 is adjusted to the second inflation pressure by the first pressure regulating valve 201, for example, 3.0kPa, the gas is introduced into the product 3 to be detected, and the gas of the product 3 to be detected may be introduced into the detection chamber 4 in real time until the gas pressure of the gas in the product 3 to be detected is the target detection gas pressure. The inflation pressure is known, and the standard chamber 22 volume V1, the inflation pressure P1, the product to be detected 3 volume V2, the detection chamber 4 volume V3, and the target detection air pressure P2 are set to obtain p2=p1v1/(v1+v2+v3). The gas inside the product 3 to be detected can be further stabilized by using normal pressure inflation, and if the gas pressure does not meet the specification range of the inflation pressure requirement, the gas can be fed back to the control equipment 5 for alarming.
Therefore, the lower air pressure can be used for inflating the air pressure of the air in the product 3 to be detected from the preset cut-off air pressure to the target detection air pressure, the air pressure in the system can be ensured to be stable, and the reliability and the accuracy of airtight detection are improved.
As shown in fig. 7, in the pressure stabilizing stage, the control device 5 may control the second valve 102 and the sixth valve 106 to be opened, and the first valve 101, the third valve 103, the fourth valve 104 and the fifth valve 105 to be closed, so that the standard chamber 22, the product to be detected 3 and the detection chamber 4 form a first circuit. The air pressure of the detecting component 2, the product 3 to be detected and the detecting chamber 4 reaching the target air pressure are balanced, and when the detecting component 2 monitors that the pressure does not change, the temperature controller 41 can be controlled to adjust the temperature of the air in the product 3 to be detected until the temperature of the air in the product 3 to be detected is the target detection temperature.
The temperature controller 41 in the detecting chamber 4 can monitor the gas temperature inside the product 3 to be detected in real time, and when the temperature is higher or lower than the set target detecting temperature, the cooling or heating mode is automatically started, the gas temperature in the detecting chamber 4 is reduced or increased, and the gas temperature in the product 3 to be detected is replaced in real time, so that the temperature inside the product 3 to be detected is close to the target detecting temperature. In addition, the humidity sensor 43 in the detecting chamber 4 can monitor the gas humidity of the product 3 to be detected, and the humidity is not satisfied and can give an alarm.
In some embodiments, the control device 5 is configured to control the second valve 102 to open, and the first valve 101, the third valve 103, the fourth valve 104, the fifth valve 105, and the sixth valve 106 to close, so that the product 3 to be detected and the detection chamber 4 form a fifth loop, and the fifth loop is configured to detect whether the product 3 to be detected leaks.
As shown in fig. 8, in the test stage, the control device 5 may control the second valve 102 to be opened, the first valve 101, the third valve 103, the fourth valve 104, the fifth valve 105 and the sixth valve 106 to be closed, if the product 3 to be detected leaks, the pressure is reduced, a pressure difference is formed between the product to be detected and the standard chamber 22, the leak detector 21 may monitor the pressure difference and output a leakage value to be fed back to the control device 5, if the leakage value exceeds a preset specification range, the product 3 to be detected may be considered to be leaked, and the product may need to be returned to the factory for maintenance, and if the leakage value is within the preset specification range, the product 3 to be detected may be considered to be not leaked, and the detection is passed.
In this way, the airtight detection function can be achieved by the leak detector monitoring the pressure difference between the product to be detected and the standard chamber.
In some embodiments, the control device 5 is configured to control the third valve 103 and the fourth valve 104 to open, and the first valve 101, the second valve 102, the fifth valve 105, and the sixth valve 106 to close, so that the product 3 to be tested and the testing chamber 4 form a sixth loop, and the sixth loop is configured to exhaust the product 3 to be tested and the testing chamber 4.
As shown in fig. 9, in the exhaust stage, the control device 5 may further control the third valve 103 and the fourth valve 104 to be opened, the first valve 101, the second valve 102, the fifth valve 105 and the sixth valve 106 to be closed, and exhaust the product 3 to be tested, the test chamber 4 and the pipeline, and the standard chamber 22 is not exhausted.
In this way, after the airtight detection is finished, the product 3 to be detected, the detection chamber 4 and the pipeline can be exhausted, so that the aim of maintaining the airtight detection system is fulfilled.
In some embodiments, the detection chamber 4 is provided with an insulating layer.
In this embodiment, the detection chamber 4 may further be provided with an insulating layer, and the insulating layer may be coated inside the detection chamber 4, or may be provided with an insulating cover outside the detection chamber 4. In this way, it is possible to further ensure that the gas inside the detection chamber 4 is not affected by external environmental factors, ensuring the accuracy of the data detected by the detection chamber 4.
In some embodiments, the first connecting pipe of the product 3 to be detected and the detecting chamber 4 has a larger diameter than the second connecting pipe and a smaller length than the second connecting pipe, wherein the second connecting pipe is other connecting pipes except the product 3 to be detected and the detecting chamber 4 in the airtight detecting system.
In this embodiment, the diameter of the connecting pipe of the product 3 to be inspected and the inspection chamber 4 may be larger than other connecting pipes of the airtight inspection system except for the product 3 to be inspected and the inspection chamber 4, and the length may be smaller than the other connecting pipes. In other words, the connecting pipeline of the product 3 to be detected and the detecting chamber 4 is shortened and enlarged compared with other connecting pipelines, so that the replacement rate of the gas in the product 3 to be detected and the gas in the detecting chamber 4 can be further accelerated, and the accuracy of airtight detection is further ensured.
Based on the airtight detection system provided by the embodiment of the application, the airtight detection can be carried out on the product to be detected. Fig. 10 is a schematic flow chart of the airtight detection system according to the embodiment of the present application. As shown in fig. 10, the airtight test may include the steps of:
In step 1001, a product to be tested is connected to the testing chamber.
Step 1002, a chamber exhaust phase is detected. And discharging the original gas in the product to be detected and the detection chamber to make the gas states of the product to be detected and the detection chamber consistent.
Step 1003, high pressure priming phase. The internal gas pressure of the product to be detected is pre-charged to a preset cut-off gas pressure.
Step 1004, an atmospheric inflation stage. And filling the gas pressure in the product to be detected to the target detection gas pressure.
Step 1005, a voltage stabilizing stage and temperature and humidity judgment. Whether the temperature is the target detection temperature or not, whether the humidity is the target detection humidity or not, if so, step 1006 is executed, and if not, step 1009 is executed.
In step 1006, a test stage, air leakage determination is performed. Whether the product to be detected leaks is determined, if not, step 1007 is executed, and if yes, step 1010 is executed.
Step 1007, electrolyte leakage determination. Whether the product to be detected has electrolyte leakage is determined, if not, step 1008 is executed, and if yes, step 1010 is executed.
Step 1008, an exhaust phase. And exhausting the product to be detected and the detection chamber.
In step 1009, the temperature and humidity are adjusted and gas replacement is performed.
Step 1010, returning to factory for maintenance.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (13)

1. A gas tightness detection system, comprising:
the air source and the detection assembly are connected with the inlet end of the detection assembly through a first valve;
the inlet end of the product to be detected is connected with the outlet end of the detection assembly through a second valve, and the inlet end of the product to be detected is connected with the outlet end of the air source through a third valve;
The inlet end of the detection chamber is connected with the outlet end of the product to be detected, the outlet end of the detection chamber is connected with the external environment through a fourth valve, and the detection chamber comprises a temperature controller for monitoring and adjusting the temperature of the gas in the product to be detected;
The outlet end of the air source is provided with a first pressure regulating valve, the outlet end of the air source sequentially passes through the first pressure regulating valve and the first valve and is connected with the inlet end of the detection assembly, and the outlet end of the air source sequentially passes through the first pressure regulating valve and the third valve and is connected with the inlet end of the product to be detected;
the airtight detection system further comprises:
The control equipment is in communication connection with the temperature controller, the first valve, the second valve, the third valve, the fourth valve and the first pressure regulating valve; the control device is used for controlling the second valve to be opened, and the first valve, the third valve and the fourth valve are closed so that the detection assembly, the product to be detected and the detection chamber form a first loop, and the first loop is used for performing temperature compensation on the temperature of gas in the product to be detected;
wherein, the temperature compensation for the gas temperature in the product to be detected comprises:
when the temperature of the gas in the detection chamber is detected to be outside the target detection temperature, the control equipment controls the temperature controller to adjust the temperature of the gas in the detection chamber;
And the gas with the temperature in the detection chamber adjusted is replaced with the gas in the product to be detected in real time, so that the temperature of the gas in the product to be detected is within the target detection temperature.
2. The airtight detection system according to claim 1, wherein the outlet end of the air source is further provided with a second pressure regulating valve and a fifth valve, the air source is connected with the inlet end of the product to be detected through the second pressure regulating valve, the fifth valve and the second valve in sequence, and the second pressure regulating valve and the fifth valve are in communication connection with the control device;
The adjustable air pressure value of the first pressure regulating valve is smaller than that of the second pressure regulating valve.
3. The air tightness detection system of claim 2 wherein the detection assembly comprises:
the leak detector is connected with the inlet end of the product to be detected through the second valve;
The inlet end of the standard chamber is connected with the leak detector, the outlet end of the standard chamber sequentially passes through a sixth valve and the second valve and is connected with the inlet end of the product to be detected, and the sixth valve is in communication connection with the control equipment.
4. A gas tightness detection system according to claim 3 wherein said control means is arranged to control the opening of said second valve and said fifth valve, and the closing of said first valve, said third valve, said fourth valve and said sixth valve, so that said gas source, said product to be detected and said detection chamber form a second circuit for pre-filling the gas pressure of the gas in said product to be detected to a preset cut-off pressure.
5. The airtight testing system of claim 4, wherein said control means is adapted to control the opening of said first valve, said second valve and said sixth valve, and the closing of said third valve, said fourth valve and said fifth valve such that said gas source, said standard chamber, said product to be tested and said testing chamber form a third circuit for inflating the gas pressure of the gas within said product to be tested from said preset cutoff gas pressure to a target testing gas pressure.
6. The airtight testing system of claim 4 or 5, wherein said control device is configured to control opening of said second valve, said fourth valve and said fifth valve, and closing of said first valve, said third valve and said sixth valve, such that said gas source, said product to be tested and said testing chamber form a fourth circuit for maintaining said product to be tested in agreement with the gas conditions in said testing chamber.
7. The airtight testing system of claim 4 or 5, wherein said control device is configured to control said second valve to open, and said first valve, said third valve, said fourth valve, said fifth valve and said sixth valve to close, such that said product to be tested and said testing chamber form a fifth circuit for detecting whether said product to be tested is leaking.
8. The airtight testing system of claim 4 or 5, wherein said control device is configured to control said third valve and said fourth valve to open, and said first valve, said second valve, said fifth valve and said sixth valve to close, such that said product to be tested and said resulting testing chamber form a sixth circuit for venting said product to be tested and said testing chamber.
9. The gas tightness detection system of claim 1 wherein said detection chamber comprises a pressure sensor in communication with said control device for monitoring the gas pressure of the gas in the product to be detected.
10. The gas tightness detection system according to claim 1, wherein said detection chamber comprises a humidity sensor in communication with said control device for monitoring the humidity of the gas in said product to be detected.
11. The gas tightness detection system of claim 1 wherein said detection chamber comprises a volatile organic compound sensor in communication with said control device for monitoring the concentration of gaseous medium volatilized from the electrolyte in the product to be detected.
12. The airtight detection system of claim 1, wherein the detection chamber is provided with an insulating layer.
13. The airtight detection system of claim 1, wherein a first connecting pipe of the product to be detected and the detection chamber has a larger diameter than a second connecting pipe and a smaller length than the second connecting pipe, wherein the second connecting pipe is other connecting pipes of the airtight detection system except for the product to be detected and the detection chamber.
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