A battery gas production testing system

Abstract

This application discloses a battery gas generation testing system, including a calibration chamber, a measurement chamber, a pump-valve delivery pipeline, and an external control loop. The pump-valve delivery pipeline connects the calibration chamber and the measurement chamber. The other end of the calibration chamber and the measurement chamber are connected to the outside via the pump-valve delivery pipeline. The external control loop is electrically connected to the calibration chamber, the measurement chamber, and the pump-valve delivery pipeline. The external control loop transmits the test gas from the calibration chamber to the measurement chamber via the valve delivery pipeline. In the measurement chamber, the gas generation test of the battery under test is performed using the measurement method corresponding to the battery under test, obtaining the gas generation amount of the battery under test. By setting up a calibration chamber and a measurement chamber, and transmitting the test gas from the calibration chamber to the measurement chamber to perform the gas generation test on the battery under test, this application transforms the measurement of the gas generation amount of the battery under test into the detection of gas changes in the measurement chamber before and after the gas generation test, achieving accurate measurement of the gas generation amount.

Description

Technical Field

[0001] This application relates to the field of battery gas generation measurement equipment technology, and in particular to a battery gas generation testing system. Background Technology

[0002] For power batteries, a certain amount of gas is generated under normal charge-discharge cycles as well as abuse conditions such as overcharging, over-discharging, and overheating. This increases the internal pressure of the battery, causing it to bulge or triggering a safety accident. Most existing battery gas generation detection devices can only extract a portion of the gas inside the battery for composition analysis, but they cannot quantify the volume of compressed gas inside the battery. Therefore, it is necessary to accurately measure the amount of gas generated by the battery, which is of great significance for studying various battery performance characteristics, quantitative and qualitative analysis of gas generation, and battery safety life. Utility Model Content

[0003] To address the aforementioned problems, embodiments of this application provide a battery gas generation testing system.

[0004] In the first aspect, in order to solve the above-mentioned technical problems, this application provides a battery gas generation test system, including a calibration chamber, a measurement chamber, a pump and valve delivery pipeline and a peripheral control circuit; The pump valve delivery pipeline connects the calibration chamber and the measurement chamber. The other end of the calibration chamber and the measurement chamber are connected to the outside through the pump valve delivery pipeline. The peripheral control circuit is electrically connected to the calibration chamber, the measurement chamber and the pump valve delivery pipeline. The peripheral control loop transmits the test gas in the calibration chamber to the measurement chamber through the pump valve delivery pipeline, so as to complete the gas production test of the battery under test in the measurement chamber using the measurement method corresponding to the battery under test, and obtain the gas production amount of the battery under test.

[0005] The beneficial effects are: by setting up a calibration chamber and a measurement chamber, the test gas in the calibration chamber is transferred to the measurement chamber to perform a gas production test on the battery under test. This transforms the measurement of the gas production of the battery under test into the detection of gas changes in the measurement chamber before and after the gas production test, thus obtaining accurate measurement data and achieving precise measurement of gas production.

[0006] Based on the above technical solution, the battery gas generation testing system of this utility model can be further improved as follows.

[0007] Furthermore, the pump and valve delivery pipeline includes a calibration pipeline, a transfer pipeline, an external extraction pipeline, an extraction and discharge pipeline, and a loading and discharge pipeline; The calibration pipeline connects the air inlet of the battery gas generation test system to the calibration chamber, and introduces a preset volume of the test gas into the calibration chamber; The transfer pipeline connects the calibration chamber and the measurement chamber, and transmits the test gas to the measurement chamber; The external extraction pipeline connects the gas carrier port of the battery gas generation test system and the measuring chamber, and performs the external extraction process on the measuring chamber. The extraction pipe connects the measuring chamber and the extraction port, and is used for extraction processing of the measuring chamber; The discharge pipeline connects the air inlet, the measuring chamber, and the discharge outlet, and performs the discharge process on the measuring chamber.

[0008] Furthermore, multiple solenoid valves are installed on the pump valve delivery pipeline; The air inlet of the calibration chamber is connected to a solenoid valve for air intake, and the air outlet is connected to a solenoid valve for transferring the test gas. The air inlet of the measuring chamber is connected to a solenoid valve for transferring gas and a solenoid valve for supplying carrier gas, while the air outlet is connected to a solenoid valve for discharging carrier gas and a solenoid valve for evacuating air.

[0009] Furthermore, an air pump is installed on the transfer pipeline, and the air pump has a unidirectional air extraction direction.

[0010] Furthermore, an exhaust pump is installed on the external extraction pipe, and the exhaust pump has a unidirectional exhaust direction.

[0011] Furthermore, a first temperature sensor and a first pressure sensor are installed on the calibration chamber for measuring the indoor temperature and pressure.

[0012] Furthermore, a second temperature sensor and a second pressure sensor are installed on the measuring chamber for measuring the indoor temperature and pressure.

[0013] Furthermore, the battery gas generation test system also includes a system operation interface, which is electrically connected to the calibration chamber, the measurement chamber, the pump valve delivery pipeline, and the peripheral control circuit, respectively. The system operation interface is used to receive operation information and to receive and display various display information transmitted by the calibration chamber, the measurement chamber, the pump valve delivery pipeline, and the peripheral control circuit. The system operation interface includes multiple sub-interfaces such as monitoring interface, system operation, manual control, IO status, parameter settings, data curves, and alarm records.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of a battery gas generation testing system shown in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the pump and valve delivery pipeline connecting the calibration chamber and the measurement chamber in an exemplary embodiment; Figure 3 This is a schematic diagram of the connection relationship of solenoid valves on the pipeline in an exemplary embodiment of a battery gas generation test system; Figure 4 This is a schematic diagram of the system operation interface in an exemplary embodiment; Figure 5 This is a schematic diagram of the system operation interface in an exemplary embodiment. Detailed Implementation

[0016] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0017] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0018] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0019] In this application, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0020] To address the above-mentioned problems, embodiments of this application propose a battery gas generation testing system, which mainly relates to battery gas generation measurement equipment technology, and these embodiments will be described in detail below.

[0021] Please refer to the following first. Figure 1 , Figure 1 This is a schematic diagram illustrating a battery gas generation testing system according to an exemplary embodiment of this application. Figure 1 As shown, in an exemplary embodiment, the device includes a calibration chamber 10, a measurement chamber 20, a pump and valve delivery pipeline 30, and a peripheral control loop 40; The pump valve delivery pipeline 30 connects the calibration chamber 10 and the measuring chamber 20. The other end of the calibration chamber 10 and the measuring chamber 20 are connected to the outside world through the pump valve delivery pipeline 30. The external control circuit 40 is electrically connected to the calibration chamber 10, the measuring chamber 20 and the pump valve delivery pipeline 30. The peripheral control loop 40 transmits the test gas in the calibration chamber 10 to the measurement chamber 20 through the pump valve delivery pipeline 30, so as to complete the gas production test of the battery under test in the measurement chamber 20 using the measurement method corresponding to the battery under test, and obtain the gas production amount of the battery under test.

[0022] In use, the pump valve delivery pipeline 30 uses the measurement method corresponding to the battery under test to transmit the test gas in the calibration chamber 10 to the measurement chamber 20 to perform a gas production test on the battery under test and obtain measurement data; based on the measurement data, the gas pressure change in the measurement chamber 20 before and after the gas production test is obtained, thereby obtaining the gas production amount of the battery under test.

[0023] As can be seen from the above, in the device provided in this embodiment, by setting up a calibration chamber 10 and a measurement chamber 20, the test gas in the calibration chamber 10 is transferred to the measurement chamber 20 and then the gas production test is performed on the battery under test. Thus, the measurement of the gas production of the battery under test is converted into the detection of the gas pressure change in the measurement chamber 20 before and after the gas production test, which can obtain accurate measurement data and thus achieve accurate measurement of the gas production.

[0024] Optionally, the measurement method for the battery under test can be manual, semi-automatic, or automatic. The different measurement methods involve different entities performing the corresponding measurement process. For example, in manual measurement, personnel manually operate each step; in semi-automatic measurement, the system automatically acquires measurement data and calculates gas production, while personnel manually perform other steps; in automatic measurement, the system automatically completes all steps, but the execution process remains the same. Specifically, using the measurement method corresponding to the battery under test, a preset volume of test gas is introduced into the calibration chamber 10 according to the test preparation step in the measurement process, and the test gas is then transferred to the measurement chamber 20; according to the measurement steps, the battery under test undergoes pre-treatment, and gas production in the measurement chamber 20 is tested to obtain measurement data; according to the exhaust step, the measurement chamber 20 is either evacuated or discharged.

[0025] Thus, the present application, through the above embodiments, can adapt to the measurement needs corresponding to different application scenarios and testing requirements. Based on the measurement needs of the battery under test, it can configure the corresponding measurement methods, detection modes and measurement processes, thereby being applicable to various types of battery gas generation detection. It has a wide range of applications and makes up for the problems of existing battery gas generation testing having large limitations in terms of scenarios and single scenarios.

[0026] Optionally, in an exemplary embodiment of this application, the pump valve delivery pipeline 30 includes a calibration pipeline 31, a transfer pipeline 32, an external extraction pipeline 33, an external extraction pipeline 34, and a discharge pipeline 35. Please refer to... Figure 2 , Figure 2 This is a schematic diagram of the connection between the pump valve delivery pipeline 30 and the calibration chamber 10 and the measurement chamber 20 in an exemplary embodiment.

[0027] like Figure 2 As shown, calibration pipe 31 connects the air inlet of the battery gas generation test system to calibration chamber 10, and introduces a preset volume of test gas into calibration chamber 10. Transfer pipe 32 connects calibration chamber 10 and measurement chamber 20, and transfers test gas to measurement chamber 20; The external extraction pipe 33 connects the gas inlet of the battery gas generation test system to the measuring chamber 20, and performs the external extraction process on the measuring chamber 20; an air extraction pump and a solenoid valve (not shown in the figure) may also be installed between the measuring chamber 20 and the gas inlet. The extraction pipe 34 connects the measuring chamber 20 and the extraction port, and is used to extract water from the measuring chamber 20; an exhaust pump (not shown in the figure) may also be installed between the measuring chamber 20 and the extraction port. The air carrier pipe 35 connects the air carrier port, the measuring chamber 20, and the air carrier port, and performs the air carrier process on the measuring chamber 20.

[0028] In use, different pipelines are applied for different test scenarios and requirements of the batteries under test. For example, batteries that have already bulged and produced gas are placed in the measurement chamber beforehand. After calibration, the volume of the measurement chamber after placing different types of batteries is measured. Then, the bulging battery is punctured by the needle-punching mechanism in the measurement chamber, and gas fills the measurement chamber. The pressure is measured and converted to obtain the gas production of the bulging battery. Alternatively, batteries that have not produced gas are placed in the measurement chamber beforehand and undergo charge-discharge cycles inside until gas is produced (the battery explosion-proof valve needs to be opened). The gas production after charge-discharge cycles is then calculated. Therefore, in this embodiment, the detection mode corresponding to different measurement requirements of the batteries under test can be an internal detection mode or an external detection mode. The internal detection mode includes internal battery charge-discharge gas production detection and internal bulging battery gas production detection, while the external detection mode includes external gas extraction detection. The measurement process for detecting gas generation during internal battery charging and discharging includes calibration, transfer, charging and discharging, measurement, and extraction / discharge; the measurement process for detecting gas generation during internal bulging battery charging and discharging includes calibration, transfer, puncture, measurement, and extraction / discharge; the measurement process for detecting external gas extraction includes calibration, transfer, external extraction, measurement, and extraction / discharge.

[0029] Therefore, the pump and valve delivery pipeline 30 used for internal battery charging and discharging gas generation detection includes a calibration pipeline 31, a transfer pipeline 32, and an extraction pipeline 34 (or a carrier pipeline 35). The pump and valve delivery pipeline 30 used for internal bulging battery gas generation detection includes a calibration pipeline 31, a transfer pipeline 32, and an extraction pipeline 34 (or a carrier pipeline 35). The pump and valve delivery pipeline 30 used for external gas extraction detection includes a calibration pipeline 31, a transfer pipeline 32, an external extraction pipeline 33, and an extraction pipeline 34 (or a carrier pipeline 35).

[0030] Optionally, in an exemplary embodiment of this application, a plurality of solenoid valves are provided on the pump valve delivery pipeline. See also... Figure 3 , Figure 3 This is a schematic diagram of the solenoid valve connections on a pipeline within a battery gas generation test system in an exemplary embodiment. (See diagram below.) Figure 3 As shown, the pump valve delivery pipeline is equipped with multiple solenoid valves, including solenoid valve 1 to solenoid valve 7. The air inlet of the calibration chamber is connected to solenoid valve 1 for air intake, and the air outlet is connected to solenoid valve 2 for transferring test gas. The air inlet of the measurement chamber is connected to solenoid valve 3 for transferring gas and solenoid valve 7 for carrying carrier gas, respectively, and the air outlet is connected to solenoid valve 5 for carrying gas discharge and solenoid valve 4 for pumping gas discharge.

[0031] In this embodiment, a vacuum pump is installed on the transfer pipeline, positioned between the calibration chamber and the measurement chamber. It connects to solenoid valves 2, 3, 6, and 7 via a four-way connector, exhibiting a left-in, right-out directional configuration. Its main function is to transfer gas from the calibration chamber to the measurement chamber, or to draw external gas into the measurement chamber via solenoid valve 6. An exhaust pump is installed on the external exhaust pipeline, positioned between the measurement chamber and the exhaust port, connected to solenoid valve 4. It also exhibits a left-in, right-out directional configuration. Its main function is to evacuate and exhaust gas from the measurement chamber, and to perform gas extraction and purification of the entire system before and after testing.

[0032] Therefore, the gas flow in the calibration pipeline is: inlet → solenoid valve 1 → calibration chamber. The gas flow in the transfer pipeline is: calibration chamber → solenoid valve 2 → vacuum pump → solenoid valve 3 → measuring chamber. The gas flow in the external extraction pipeline is: carrier gas inlet → solenoid valve 6 → vacuum pump → solenoid valve 3 → measuring chamber. The vacuum pump draws test gas from the carrier gas inlet or calibration chamber into the measuring chamber, where quantitative measurement is performed. The gas flow in the exhaust pipeline is: measuring chamber → solenoid valve 4 → exhaust pump → exhaust port. After quantitative gas measurement, the exhaust pump evacuates the gas in the measuring chamber to a negative pressure vacuum state. The gas is then discharged to the outside through the exhaust port or collected through a gas bag to complete the exhaust process. The gas flow path within the carrier gas pipeline is as follows: carrier gas port → solenoid valve 6 → solenoid valve 7 → measuring chamber → solenoid valve 5 → carrier gas outlet. Using carrier gas discharge processing, after quantitative gas measurement, inert gas is introduced through the carrier gas port. The power source from the carrier gas source gradually carries the generated gas out of the measuring chamber. Gas is collected at the carrier gas outlet or introduced into a GCMS device for qualitative analysis of the generated gas components. Furthermore, the external control loop is electrically connected to each component and is therefore not shown in the structural diagram of this embodiment.

[0033] Optionally, in an exemplary embodiment of this application, such as Figure 3 As shown, the calibration chamber is equipped with a first temperature sensor and a first pressure sensor, namely... Figure 3 Temperature Measurement 1 and Pressure Measurement 1 are used to measure and demonstrate indoor temperature and pressure. A second temperature sensor and a second pressure sensor are installed on the measuring chamber. Figure 3 Temperature Measurement 2 and Pressure Measurement 2 are used to measure and display indoor temperature and pressure to complete the calculation of gas production.

[0034] Preferably, for calculating the gas production, the known volume V is used. 标 A certain amount of inert gas is introduced into the calibration chamber, and the pressure P in the calibration chamber is recorded by the first pressure sensor. 标 Then, it is transferred to the measuring chamber, and the pressure P1 in the measuring chamber is recorded by the second pressure sensor. The initial effective volume V of the measuring chamber can then be calculated. voidEnsure that the initial pressures of the calibration chamber and the measurement chamber are consistent before ventilation, and that the ambient temperature for pressure measurement is consistent after ventilation using the first and second temperature sensors, to obtain more accurate measurement data.

[0035] According to Pormadic Law: P 标 V 标 =P1V void And the ideal gas law: PV=nRT, the gas production volume of thermal runaway is calculated by measuring the pressure inside the explosion-proof cavity after thermal runaway of the battery under test, as shown in the following formula: Where V gas V is the volume of gas produced by thermal runaway. void The effective volume of the gas in the measuring chamber is given by P1 and P2, which represent the pressures of the gas in the measuring chamber before and after gas production, respectively. T is the ambient temperature, R is the ideal gas constant, and V is the volume of the gas in the measuring chamber. m0 This refers to the molar volume of an ideal gas under standard operating conditions. Therefore, knowing the initial effective volume and pressure of the measuring chamber before gas production, and recording the pressure after gas production, the produced gas volume can be calculated. Similarly, it is essential to ensure that the ambient temperature for measuring the pressure remains consistent before and after gas production to obtain a more accurate gas production rate.

[0036] Optionally, in an exemplary embodiment of this application, the battery gas generation testing system further includes a system operation interface, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of the system operation interface in an exemplary embodiment. The system operation interface includes multiple sub-interfaces such as a monitoring interface, system operation, manual control, IO status, parameter settings, data curves, and alarm records. The system operation interface is electrically connected to the calibration room, measurement room, pump and valve delivery pipeline, and external control loop, respectively. It is used to receive and display various display information transmitted from the calibration room, measurement room, pump and valve delivery pipeline, and external control loop. It is also used to receive operation information and generate control commands, transmitting the corresponding electrical signals of the control commands to the calibration room, measurement room, and pump and valve delivery pipeline through the external control loop.

[0037] Specifically, such as Figure 4 As shown, the monitoring interface is mainly used to monitor the on / off status of pumps and valves throughout the entire unit, as well as the pressure and temperature in the calibration and measurement chambers. It can also display gas production-related data, system operating status, current process steps, operating modes, and exhaust methods. For example... Figure 5 As shown, Figure 5 This is a schematic diagram of the system operation interface in an exemplary embodiment. The system operation is used to set the system's working mode and exhaust method, manual / automatic switch, and "start, stop, reset" button operations.

[0038] When using the battery gas generation testing system provided in this application embodiment to measure battery gas generation, the detection mode of the battery under test is either internal detection mode or external detection mode. Internal detection mode includes internal battery charge / discharge gas generation detection and internal bulging battery gas generation detection; external detection mode includes external gas extraction detection. The measurement process for internal battery charge / discharge gas generation detection includes purification, calibration, transfer, charge / discharge, measurement, and extraction / discharge. The measurement process for internal bulging battery gas generation detection includes purification, calibration, transfer, puncture, measurement, and extraction / discharge. The measurement process for external gas extraction detection includes purification, calibration, transfer, external extraction, measurement, and extraction / discharge. Purification, calibration, and transfer are test preparation steps; charge / discharge, puncture, external extraction, and measurement are measurement steps; and extraction and discharge are gas venting steps.

[0039] The steps for performing a gas generation test on the battery under test using the above-described battery gas generation test system include: Connect the external battery venting pipe or the internal battery charging / discharging circuit. Power-on initialization, reset and close the pump valve on the delivery pipeline, and reset the punctured electrode back to zero position; Set the battery detection mode (internal detection or external detection), set the exhaust process of the measurement procedure corresponding to the detection mode (extraction exhaust or carrier gas exhaust), and select the working mode (manual, semi-automatic or automatic). In automatic operation mode, for the detection of gas generation during internal battery charging and discharging, the corresponding measurement process is executed sequentially, including purification, calibration, transfer, charging and discharging, measurement, and extraction / discharge. In automatic operation mode, for the detection of gas generation in the internal bulging battery, the corresponding measurement process is executed in sequence, including purification, calibration, transfer, puncture, measurement and extraction / discharge. In automatic operation mode, for external gas extraction and detection, the corresponding measurement process is executed sequentially, including purification, calibration, transfer, external extraction, measurement, and extraction / discharge. In semi-automatic mode, referencing automatic mode, operate each process step by step according to the measurement process. Process data is automatically recorded and calculated, and the manual touch screen monitoring interface displays "total gas production". In manual mode, each pump and valve is operated manually according to each measurement process (refer to automatic mode), the temperature and pressure data of the calibration chamber and the measurement chamber are recorded manually during the operation, and the gas production is calculated.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery gas generation testing system, characterized by, This includes a calibration room, a measurement room, pump and valve delivery pipelines, and external control circuits; The pump valve delivery pipeline connects the calibration chamber and the measurement chamber. The other end of the calibration chamber and the measurement chamber are connected to the outside through the pump valve delivery pipeline. The peripheral control circuit is electrically connected to the calibration chamber, the measurement chamber and the pump valve delivery pipeline. The peripheral control loop transmits the test gas in the calibration chamber to the measurement chamber through the pump valve delivery pipeline, so as to complete the gas production test of the battery under test in the measurement chamber using the measurement method corresponding to the battery under test, and obtain the gas production amount of the battery under test.

2. The battery gas production test system of claim 1, wherein, The pump and valve delivery pipeline includes a calibration pipeline, a transfer pipeline, an external extraction pipeline, an extraction and discharge pipeline, and a loading and discharge pipeline; The calibration pipeline connects the air inlet of the battery gas generation test system to the calibration chamber, and introduces a preset volume of the test gas into the calibration chamber; The transfer pipeline connects the calibration chamber and the measurement chamber, and transmits the test gas to the measurement chamber; The external extraction pipeline connects the gas carrier port of the battery gas generation test system and the measuring chamber, and performs the external extraction process on the measuring chamber. The extraction pipe connects the measuring chamber and the extraction port, and is used for extraction processing of the measuring chamber; The discharge pipeline connects the air inlet, the measuring chamber, and the discharge outlet, and performs the discharge process on the measuring chamber.

3. The battery gas production test system of claim 2, wherein, Multiple solenoid valves are installed on the pump valve delivery pipeline; The air inlet of the calibration chamber is connected to a solenoid valve for air intake, and the air outlet is connected to a solenoid valve for transferring the test gas. The air inlet of the measuring chamber is connected to a solenoid valve for transferring gas and a solenoid valve for supplying carrier gas, while the air outlet is connected to a solenoid valve for discharging carrier gas and a solenoid valve for evacuating air.

4. The battery gas production test system of claim 2, wherein, An air pump is installed on the transfer pipeline, and the air pump has a unidirectional air extraction direction.

5. The battery gas generation testing system according to claim 2, characterized in that, An exhaust pump is installed on the external extraction pipe, and the exhaust pump has a unidirectional exhaust direction.

6. The battery gas production test system of claim 1, wherein, The calibration chamber is equipped with a first temperature sensor and a first pressure sensor for measuring the indoor temperature and pressure.

7. The battery gas production test system of claim 1, wherein, The measuring chamber is equipped with a second temperature sensor and a second pressure sensor for measuring the indoor temperature and pressure.

8. The battery gas production test system of any one of claims 1-7, wherein, The battery gas generation test system also includes a system operation interface, which is electrically connected to the calibration chamber, the measurement chamber, the pump valve delivery pipeline, and the peripheral control circuit, respectively. The system operation interface is used to receive operation information and to receive and display various display information transmitted by the calibration chamber, the measurement chamber, the pump valve delivery pipeline, and the peripheral control circuit. The system operation interface includes multiple sub-interfaces such as monitoring interface, system operation, manual control, IO status, parameter settings, data curves, and alarm records.

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