In-situ detection system for gas production of aqueous battery

Abstract

The utility model relates to an in-situ detection system for gas production of an aqueous battery. The in-situ detection system comprises a gas carrying device, an in-situ detection device, a condensing device and a mass spectrometer which are connected in series, the in-situ detection device comprises a vertical shell, a cover body and a tray, a battery is loaded in the vertical shell, the top of the battery is electrically connected with the bottom of the cover body, the bottom of the battery is electrically connected with the top of the tray, an air inlet is formed in the side portion of the tray, and the air inlet is communicated with the interior of the vertical shell through an air inlet channel arranged in the tray. An air outlet is formed in the side portion of the cover body, the air outlet communicates with the interior of the vertical shell through an air outlet channel formed in the cover body, sensors are detachably installed on the upper portion of the cover body and the side portion of the tray, and the receiving ends of the sensors are used for detecting the pressure value in the vertical shell. The system effectively monitors the gas pressure change and gas component analysis in the in-situ charging and discharging process of the battery, is simple in structure, and provides data support for water-based battery research.

Description

Technical Field

[0001] The utility model relates to the technical field of water system battery detection, in particular to an in-situ detection system for gas production of water system batteries. Background Art

[0002] Energy security has become the focus of major think tanks recently. Electricity, as a clean, efficient and convenient secondary energy source, can effectively improve energy utilization efficiency, promote the development of clean energy, and improve the level of electrification. Therefore, in terms of energy consumption, replacing the direct consumption of fossil energy such as coal, oil and gas with electricity and increasing the proportion of electricity in terminal energy consumption is not only the inevitable result of clean substitution, but also the central link of energy reform and transformation.

[0003] Lithium-ion batteries play a leading role in current energy storage systems due to their high operating voltage (>3.8V) generated by the use of organic electrolytes, but they have safety, environmental and cost issues. In contrast, aqueous batteries have the advantages of low cost, high safety and high conductivity. Among them, aqueous batteries use zinc metal anodes. Due to the high theoretical specific capacity (820mAh g-1) and low redox potential (-0.76V vs SHE) of zinc metal anodes, low-cost, non-flammable aqueous zinc ion battery (AZIB) devices are expected to become the next generation of portable power sources. However, there are still many problems with zinc-based anodes, mainly including the formation of insulating ZnO or Zn(OH) during long-term cycling. 2 The passivation layer will hinder the further redox reaction of Zn, resulting in low reversible capacity, poor cycle performance, and free and uneven deposition of zinc, which will lead to the growth of zinc dendrites and deformation of the zinc foil used, which can penetrate the separator and cause battery short circuit, etc. It is particularly important that during the electroplating process of Zn, although the overpotential of HER on Zn is high, the formation of H2 cannot be completely avoided, which will seriously reduce the coulombic efficiency of the zinc battery and cause its service life to be significantly reduced. Therefore, it is an important research topic to use various modification methods to inhibit hydrogen evolution in aqueous batteries.

[0004] However, the current testing devices are only used on button cells and soft-pack batteries. Since the battery reaction of aqueous batteries is more complicated during use, a large number of side reactions will occur, and the composition is complex, resulting in a large amount of gas production, it is difficult to use existing solid-state battery testing devices. Therefore, there is currently no testing device that can perform in-situ testing and analysis of gas production in aqueous batteries, especially in practical applications. This has greatly restricted the development of aqueous batteries. Therefore, how to develop an in-situ detection system for gas production in aqueous batteries, monitor the gas pressure changes and gas composition analysis of the battery during in-situ charging and discharging, and provide data support for research is an urgent problem that needs to be solved. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide an in-situ detection system for gas production of aqueous batteries, including an in-situ detection device, a condensation device, a gas carrier device and a mass spectrometer arranged in series. The system effectively monitors the gas pressure changes and gas composition analysis during the in-situ charging and discharging process of the battery, has a simple structure and is easy to assemble, providing data support for aqueous battery research.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An in-situ detection system for gas production of water-based batteries, comprising a gas carrier device, an in-situ detection device, a condensation device and a mass spectrometer arranged in series; the gas carrier device, which is located upstream of the in-situ detection device and is used to provide carrier gas to the in-situ detection device; the in-situ detection device, which comprises a vertical shell opened up and down, a cover body detachably mounted on the top of the vertical shell body and a tray detachably mounted on the bottom of the vertical shell body, the vertical shell body is loaded with batteries, the top of the battery is electrically connected to the cover body, the bottom of the battery is electrically connected to the tray, the side of the tray has an air inlet for receiving the carrier gas, and the air inlet The cover body has an air outlet for discharging battery gas and carrier gas, and the air outlet is connected to the interior of the vertical shell through an air outlet channel arranged inside the cover body. Sensors are detachably installed on the upper part of the cover body and the side of the tray, one of which is used to detect the pressure value at the top of the battery, and the other is used to detect the pressure value at the bottom of the battery; a condensation device, which is located downstream of the in-situ detection device and is used to condense water vapor in the gas; a mass spectrometer, which is located downstream of the condensation device and is used to collect and analyze gas data.

[0008] Furthermore, a first threaded groove is provided at the bottom of the cover body, and the top thread of the vertical shell is screwed into the first threaded groove. A second threaded groove is provided at the top of the tray, and the bottom thread of the vertical shell is screwed into the second threaded groove. The top of the battery is electrically connected to the top of the first threaded groove, and the bottom of the battery is electrically connected to the bottom of the second threaded groove.

[0009] Furthermore, a sealing ring is provided between the first groove and the top of the vertical shell, and a sealing ring is provided between the second groove and the bottom of the vertical shell.

[0010] Furthermore, the air outlet channel is connected to the top of the first thread groove, and the air inlet channel is connected to the bottom of the second thread groove.

[0011] Furthermore, a temperature regulating component for regulating the temperature of the battery is also provided on the outside of the vertical housing.

[0012] Furthermore, a dust filter is provided at the air outlet.

[0013] Furthermore, the carrier gas is an inert gas, and the inert gas is nitrogen or argon.

[0014] Furthermore, a first dust removal device is provided between the condensation device and the in-situ detection device.

[0015] Furthermore, a second dust removal device is provided between the condensation device and the mass spectrometer.

[0016] Furthermore, a gas flow meter is provided between the gas carrier device and the in-situ detection device.

[0017] The utility model has the following advantages:

[0018] 1. The in-situ detection system of the utility model comprises a carrier gas device, an in-situ detection device, a condensation device and a mass spectrometer which are arranged in series. The carrier gas is introduced into the interior of a vertical shell through the carrier gas device to form a single gas atmosphere. The function of the carrier gas device is to discharge the internal air of the vertical shell before testing to prevent other gases from interfering with the data of pressure and component analysis. The function of the condensation device is to condense water vapor in the gas to prevent a large amount of water vapor containing electrolytes from directly entering the mass spectrometer. In addition, since the gas needs to be heated at the inlet of the mass spectrometer, if the gas to be tested contains water, the water will evaporate at the inlet and cause salt residue, thereby clogging the inlet. The condensation device can well solve this problem. The mass spectrometer adopts a blowing-type air intake to blow the gas into the mass spectrometer, so that the gas flows through the mass spectrometer faster, thereby obtaining faster and more accurate detection results and analyzing the composition of the battery gas.

[0019] 2. The in-situ detection device of the utility model is sealedly connected through a vertical shell, a cover body and a tray. Sensors are arranged on the cover body and the tray. The battery is loaded in the vertical shell to perform gas production detection. It can effectively monitor the gas pressure changes of the battery during the in-situ charging and discharging process. It has a simple structure and is easy to assemble, providing data support for aqueous battery research. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic flow chart of the in-situ detection system for gas production of aqueous batteries according to the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the in-situ detection device of the present invention.

[0022] Figure 3 It is a three-dimensional exploded view of the in-situ detection device of the present invention.

[0023] Figure 4 It is a cross-sectional view of the in-situ detection device of the present invention.

[0024] Among them, A is an in-situ detection device, 1 is a vertical shell, 101 is a fluid channel, 2 is a cover, 201 is an air outlet, 202 is an air outlet channel, 203 is a first threaded groove, 3 is a tray, 301 is an air inlet, 302 is an air inlet channel, 303 is a second threaded groove, 4 is a battery, 5 is a sensor, 6 is a sealing ring, 7 is a temperature control component, B is a condensing device, C is a gas carrier device, D is a mass spectrometer, E is a first dust removal device, F is a second dust removal device, G is a gas flow meter, H is a switch valve, and I is an electrochemical workstation. DETAILED DESCRIPTION

[0025] The following description is essentially only exemplary and is not intended to limit the present invention, its application or use. It will be further understood that the term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, component or part discussed below can be referred to as the second element, component or part without departing from the teaching of the utility model. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field to which the utility model belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0026] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1 As shown, an in-situ detection system for gas production of aqueous batteries includes a gas carrier device, an in-situ detection device, a condensation device and a mass spectrometer arranged in series for gas production detection. It can effectively monitor the gas pressure changes of the battery during the in-situ charging and discharging process and the composition analysis of the battery gas. It has a simple structure and is easy to assemble, providing data support for aqueous battery research.

[0029] like Figure 1 As shown, the carrier gas device is located upstream of the in-situ detection device and is used to provide carrier gas to the in-situ detection device. The carrier gas is introduced into the vertical shell through the carrier gas device, so that the vertical shell becomes a single carrier gas atmosphere to prevent other gases from interfering with the gas production of the battery. During the charge and discharge cycle, the gas generated by the reaction inside the battery is blown out from the gas outlet together with the carrier gas, thereby ensuring that the gas generated by the battery is discharged from the gas outlet to the next process without remaining in the vertical shell, thereby improving the accuracy of the detection. If a single carrier gas is not used but a vacuum method is used for gas production detection, although the gas production pressure and component analysis can also be detected, the driving force is lost due to the lack of carrier gas supply, and the rate of battery gas transmission to the mass spectrometer will be very slow, and the detection will not be timely, resulting in the time of battery gas production being different from the actual test time of the mass spectrometer, resulting in a time difference, which in turn affects the judgment of the experimental data.

[0030] like Figure 1-4 As shown, the in-situ detection device includes a vertical shell body opened up and down, a cover body detachably mounted on the top of the vertical shell body, and a tray detachably mounted on the bottom of the vertical shell body, the vertical shell body is loaded with batteries, the top of the batteries are electrically connected to the cover body, the bottom of the batteries are electrically connected to the tray, the side of the tray has an air inlet for receiving carrier gas, the air inlet is connected to the interior of the vertical shell body through an air inlet channel arranged inside the tray, the side of the cover body has an air outlet for discharging battery gas and carrier gas, the air outlet is connected to the interior of the vertical shell body through an air outlet channel arranged inside the cover body, and sensors are detachably mounted on the upper part of the cover body and the side of the tray, one of the sensors is used to detect the pressure value at the top of the battery, and the other sensor is used to detect the pressure value at the bottom of the battery.

[0031] Among them, the vertical shell is a cylindrical structure and is made of insulating plastic, such as PMMA, PC, PTFE, nylon or PEEK, preferably PEEK. The selection of the material makes the vertical shell not only heat-conductive but also has good insulation performance. The internal space of the vertical shell is used to load the aqueous battery, which is a roll-core battery structure, including a positive electrode, a diaphragm and a negative electrode that are pasted together and then wound. The gas is generated from the inside of the battery and discharged through the top and bottom of the battery. The main component of the battery gas is hydrogen, accompanied by a small amount of oxygen and other components. In order to adapt to different models and sizes of aqueous batteries for testing, the vertical shell can be replaced as needed. The cover and the tray are respectively located at the top and bottom of the vertical shell, and together form a relatively closed space with the vertical shell. The cover and the tray are made of metal or insulating metal materials, and stainless steel is the preferred material. When the battery is loaded, a fluid channel is formed between it and the vertical shell. An outlet is provided on the side of the cover, and it is connected to the fluid channel through the outlet channel for discharging battery gas and carrier gas. An air inlet is provided on the side of the tray, and is connected to the fluid channel through an air inlet channel for receiving the carrier gas. On the upper part of the cover body, a sensor is installed by means of a threaded connection. The sensor is an electronic barometer. A rubber ring is provided between the electronic barometer and the cover body to ensure a good sealing effect. When the battery gas flows with the carrier gas, it will first pass through the electronic barometer to detect the pressure change, and then be discharged through the air outlet to the mass spectrometer for component analysis. The flow path of the carrier gas enters from the air inlet of the tray, flows through the air inlet channel, the fluid channel and the air outlet channel, and finally is discharged from the air outlet of the cover body. This ensures that the carrier gas flows around the outside of the battery, ensuring that all the gas generated by the battery can flow with the carrier gas and will not remain in the vertical shell.

[0032] like Figure 1 As shown, the condensation device is located downstream of the in-situ detection device and is used to condense water vapor in the gas. The purpose of setting up the condensation device is to condense water vapor in the gas to prevent a large amount of water vapor containing electrolytes from directly entering the mass spectrometer. In addition, since the gas needs to be heated at the inlet of the mass spectrometer, if the gas to be tested contains water, the water will evaporate at the inlet and cause salt residue, which will then block the inlet. The condensation device can solve this problem well.

[0033] like Figure 1As shown, the mass spectrometer is located downstream of the condensing device and is used to collect and analyze gas data. The carrier gas and battery gas flowing through the mass spectrometer are discharged from the device after desorption. There are two ways for gas to enter the mass spectrometer: blowing and exhaust. The blowing method is to blow the gas generated in the vertical shell into the mass spectrometer through an external carrier gas device. The exhaust method uses the exhaust function of the mass spectrometer itself to extract the gas from the vertical shell. Although both methods can achieve the detection of battery gas, the blowing method has significant advantages in the speed and accuracy of obtaining test results because the gas is delivered to the mass spectrometer faster.

[0034] like Figure 1-4 As shown, the bottom of the cover is provided with a first thread groove, the top of the vertical shell is provided with a corresponding thread, the top thread of the vertical shell is screwed into the first thread groove, the top of the tray is provided with a second thread groove, the bottom of the vertical shell is provided with a corresponding thread, and the bottom thread of the vertical shell is screwed into the second thread groove. The inner diameter of the first thread groove is 1 / 4 inch, and the inner diameter of the second thread groove is 1 / 4 inch, so that the installation and docking are more stable, ensuring the sealing, and not easy to loosen during the battery testing process.

[0035] like Figure 1-4 As shown, the top of the battery is electrically connected to the first threaded groove, and the bottom of the battery is electrically connected to the second threaded groove. Among them, the top of the battery and the top of the first threaded groove are electrically connected through a conductive spring. The conductive spring not only ensures the stable transmission of electrical signals between the battery and the device, but also forms a certain fluid space between the top of the battery and the top of the first threaded groove due to its elastic properties, so as to allow the gas generated by the battery during normal operation to be smoothly precipitated, avoiding potential safety hazards caused by gas accumulation. The bottom of the battery and the bottom of the second threaded groove are electrically connected through a conductive spring, which not only ensures conductivity, but also applies a certain stress to the aqueous battery, further enhancing the connection stability between the battery and the device. Moreover, the conductive spring also forms a fluid space between the bottom of the battery and the second threaded groove, which promotes the smooth precipitation of battery gas. Among them, the in-situ detection device also includes an electrochemical workstation, which is located outside the in-situ detection device, and the cover body is provided with a cover electrode hole for inserting the conductive electrode, and the tray is provided with a tray electrode hole for inserting the conductive electrode. The electrochemical workstation is electrically connected to the conductive spring on the top of the battery through the cover electrode hole, and the electrochemical workstation is electrically connected to the conductive spring at the bottom of the battery through the tray electrode hole.

[0036] like Figure 4As shown, a sealing ring is provided between the first threaded groove and the top of the vertical shell, and a sealing ring is provided between the second threaded groove and the bottom of the vertical shell. The sealing ring can significantly improve the airtightness of the entire device to ensure that the entire device is airtight. The sealing ring can fit tightly on the contact surface between the threaded groove and the vertical shell, effectively filling the possible tiny gap. Through this design, the airtightness of the entire device is significantly improved, ensuring that no gas leakage occurs during the battery test, thereby ensuring the accuracy and reliability of the test results. In addition, the sealing ring also has a certain elasticity and corrosion resistance, can adapt to various working environments and temperature changes, and ensure that the in-situ detection device still maintains good sealing performance during long-term use.

[0037] like Figure 4 As shown, the air outlet channel is connected to the top of the first threaded groove, and the air inlet channel is connected to the bottom of the second threaded groove, so that the gas flow is smoother. Among them, one end of the air outlet channel is connected to the air outlet, and the other end of the air outlet channel is connected to the top of the first threaded groove, so as to allow the gas generated by the battery during normal operation to be discharged smoothly. In order to optimize the flow effect of the gas, the air outlet channel adopts a trumpet-shaped structure in the part close to the air outlet, that is, its inner diameter is larger near the air outlet, and gradually decreases near the first threaded groove, so that the battery gas and the carrier gas can form an expanded flow output when discharged from the vertical shell, avoiding the interference of the test results caused by excessive gas flow rate. One end of the air inlet channel is connected to the air inlet, and the other end of the air inlet channel is connected to the top of the second threaded groove. The design of the air inlet channel also adopts a trumpet-shaped structure, that is, the inner diameter of the part close to the air inlet is larger, while the inner diameter of the part close to the second threaded groove gradually decreases, so that the flow rate of the carrier gas is accelerated to a certain extent when the carrier gas enters the vertical shell, which helps to discharge the gas generated by the battery smoothly, and prevents the battery gas from flowing back to the air inlet, thereby ensuring the purity of the test environment and the accuracy of the test results.

[0038] like Figure 2-4 As shown, the outside of the vertical shell is also provided with a thermostat for adjusting the battery temperature, which has an automatic thermostat function to test the changes in the gas production pressure of the battery at different temperatures, with a temperature of 60-80°. The thermostat monitors the temperature inside the vertical shell in real time through a built-in temperature sensor, and automatically adjusts the working state of the heating or cooling element according to the preset test program to keep the temperature inside the vertical shell constant within the set range. At the same time, the thermostat also has an over-temperature protection function. When the temperature inside the vertical shell exceeds the safety threshold, it will automatically cut off the power supply of the heating element to ensure the safety and reliability of the test process.

[0039] In an embodiment not shown, a dust filter is also provided at the gas outlet. The dust filter is used to remove large particles that may exist in the battery gas to prevent clogging of equipment / devices in subsequent processes. When cleaning, just disassemble the pipeline, take out the dust filter for cleaning, and it can be reused.

[0040] like Figure 4 As shown, the carrier gas is an inert gas, which is nitrogen or argon. The carrier gas is introduced to form a single gas atmosphere inside the vertical shell. Its function is to introduce the carrier gas before testing to exhaust the internal air of the vertical shell to prevent other gases from interfering with the pressure and component analysis data.

[0041] like Figure 1 As shown, a first dust removal device is also provided between the condensing device and the in-situ detection device. The first dust removal device includes a dust removal filter, which is arranged on the pipeline between the condensing device and the in-situ detection device to remove impurities in the exhaust gas of the in-situ detection device. A switch valve is provided upstream of the dust removal filter, and a branch pipeline is also provided between the condensing device and the in-situ detection device. The gas in the branch pipeline does not flow through the dust removal filter but directly enters the condensing device. The operator can control the switch valve as needed to determine whether the gas needs to be dusted.

[0042] like Figure 1 As shown, a second dust removal device is also provided between the condensing device and the mass spectrometer. The second dust removal device includes a dust removal filter, which is arranged on the pipeline between the condensing device and the mass spectrometer to remove impurities in the exhaust gas of the condensing device. A switch valve is provided upstream of the dust removal filter, and a branch pipeline is also provided between the condensing device and the mass spectrometer. The gas in the branch pipeline does not flow through the dust removal filter but directly enters the mass spectrometer. The operator can control the switch valve as needed to determine whether the gas needs to be dusted. The dust removal filter is used to remove large particles that may exist in the gas to prevent blockage of the equipment / device.

[0043] Of course, the above-mentioned first dust removal device and second dust removal device can be configured according to actual needs. For example, the first dust removal device and the second dust removal device are respectively arranged upstream and downstream of the condensing device to achieve the purpose of multi-stage dust removal, or only the first dust removal device is arranged upstream of the condensing device to remove most of the gas impurities, or the dust filter at the air outlet has effectively isolated most of the gas impurities, so there is no need to set the first dust removal device and the second dust removal device.

[0044] like Figure 1As shown, the carrier gas device is connected to the air inlet of the in-situ detection device, the condensation device is connected to the air outlet of the in-situ detection device, and a gas flow meter is also provided between the carrier gas device and the in-situ detection device. The flow of the carrier gas is quantitatively controlled by the gas flow meter to keep the carrier gas at a relatively fixed flow rate and flow rate. That is to say, in this state, the carrier gas can be regarded as a constant, which will not change due to external factors or internal fluctuations of the system, thereby ensuring the consistency and accuracy of the detection results.

[0045] There are joints on both the air outlet and the air inlet. The joint of the air outlet is connected to the condensing device through a pipeline, and the joint of the air inlet is connected to the gas carrier device through a pipeline. Both joints are threadedly connected to the air outlet and the air inlet, and the inner diameter of the threaded holes corresponding to the air outlet and the air inlet is 1 / 16 inch. The joint is made of insulating plastic, which can be PMMA, PC, PTFE, nylon, PEEK, etc.

[0046] In an embodiment not shown, the in-situ detection system also includes a control device, and the mass spectrometer, sensor, gas carrier device and electrochemical workstation are respectively connected to the control device by signal, and the detection instructions are transmitted through the control device, with a high degree of automation.

[0047] In an embodiment not shown, a three-way valve is further provided on the pipeline between the in-situ detection device and the condensation device, the first end of the three-way valve is connected to the air outlet, the second end of the three-way valve is connected to the condensation device, and the third end of the three-way valve is connected to the external environment, wherein an automatic opening and closing portion for closing or opening the third end is provided at the outlet of the third end. During battery gas production detection, the third end is in a closed state. When the sensor detects that the gas pressure inside the vertical shell is abnormal, the third end can be opened by opening the automatic opening and closing portion, so that part of the gas is discharged from the third end to the external environment.

[0048] The working method of the utility model is as follows:

[0049] S1. Assembly of the in-situ detection device: Place the battery in the three-dimensional shell, ensure that the bottom is tightly screwed to the tray through threads, screw the top of the three-dimensional shell to the cover body through threads to ensure good sealing, screw the sensor to the cover body through threads to ensure direct contact between the sensor and the internal environment, put the temperature control component on the outside of the vertical shell to prepare for subsequent temperature control, use wires to connect the battery to the electrochemical workstation to prepare for power-on testing.

[0050] S2. Connection and debugging: Connect the gas carrier device to the air inlet of the three-dimensional shell to ensure that the carrier gas can enter smoothly, connect the condensation device to the air outlet of the three-dimensional shell to condense the exhausted gas, connect the condensation device to the mass spectrometer to analyze the gas composition, turn on the gas carrier device, adjust the carrier gas flow to the preset value through the gas flow meter, and continue ventilation for 15 minutes to ensure that a stable single gas atmosphere is formed in the vertical shell, use the mass spectrometer to test the background signal, and confirm that there is no interference from other gases.

[0051] S3, Experiment and detection: Open the external temperature control component, set the required battery temperature according to the experimental requirements, input the battery test program into the external control device, and start the experiment. Power on the battery through the electrochemical workstation to trigger the chemical reaction inside the battery and generate gas. Use the mass spectrometer to monitor and record the changes in the internal gas during the battery charging and discharging process in real time. At the same time, monitor and record the pressure changes of the internal gas through the sensor. After the experiment, read and analyze the test values ​​to obtain the experimental results.

[0052] In general, the in-situ detection system of the utility model includes a carrier gas device, an in-situ detection device, a condensation device and a mass spectrometer arranged in series. The carrier gas is introduced into the interior of a vertical shell through the carrier gas device to form a single gas atmosphere. The function of the carrier gas is to discharge the internal air of the vertical shell before testing to prevent other gases from interfering with the pressure and component analysis data; the function of the condensation device is to condense water vapor in the gas to prevent a large amount of water vapor containing electrolytes from directly entering the mass spectrometer. In addition, since the gas needs to be heated at the inlet of the mass spectrometer, if the gas to be tested contains water, the water will evaporate at the inlet and cause salt residue, thereby clogging the inlet. This problem can be well solved by the condensation device; the mass spectrometer adopts a blowing-type air intake to blow the gas into the mass spectrometer, so that the gas flows through the mass spectrometer faster, thereby obtaining faster and more accurate detection results and analyzing the composition of the battery gas. The in-situ detection device of the utility model is sealedly connected by a vertical shell, a cover body and a tray. Sensors are arranged on the cover body and the tray. The battery is loaded in the vertical shell to perform gas production detection. It can effectively monitor the gas pressure changes of the battery during the in-situ charging and discharging process. It has a simple structure and is easy to assemble, providing data support for aqueous battery research.

[0053] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An in-situ detection system for gas production in aqueous batteries, characterized in that: It includes a gas carrier device, an in-situ detection device, a condensation device and a mass spectrometer arranged in series; A gas carrier device, the gas carrier device is located upstream of the in-situ detection device and is used to provide carrier gas to the in-situ detection device; An in-situ detection device, the in-situ detection device comprises a vertical shell body opened at the top and the bottom, a cover body detachably mounted on the top of the vertical shell body, and a tray detachably mounted on the bottom of the vertical shell body, the vertical shell body is loaded with batteries, the top of the battery is electrically connected to the cover body, the bottom of the battery is electrically connected to the tray, the side of the tray is provided with an air inlet for receiving a carrier gas, the air inlet is connected to the interior of the vertical shell body through an air inlet channel arranged inside the tray, the side of the cover body is provided with an air outlet for discharging battery gas and carrier gas, the air outlet is connected to the interior of the vertical shell body through an air outlet channel arranged inside the cover body, the upper part of the cover body and the side of the tray are both detachably mounted with sensors, one of which is used to detect the pressure value at the top of the battery, and the other is used to detect the pressure value at the bottom of the battery; A condensation device, which is located downstream of the in-situ detection device and is used to condense water vapor in the gas; A mass spectrometer is located downstream of the condensation device and is used to collect analytical gas data.

2. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: A first threaded groove is provided at the bottom of the cover body, and the top thread of the vertical shell is screwed into the first threaded groove. A second threaded groove is provided at the top of the tray, and the bottom thread of the vertical shell is screwed into the second threaded groove. The top of the battery is electrically connected to the top of the first threaded groove, and the bottom of the battery is electrically connected to the bottom of the second threaded groove.

3. The in-situ detection system for gas production in aqueous batteries according to claim 2, characterized in that: A sealing ring is arranged between the first groove and the top of the vertical shell, and a sealing ring is arranged between the second groove and the bottom of the vertical shell.

4. The in-situ detection system for gas production in aqueous batteries according to claim 2, characterized in that: The air outlet channel is connected to the top of the first thread groove, and the air inlet channel is connected to the bottom of the second thread groove.

5. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: A temperature regulating component for regulating the temperature of the battery is also provided on the outside of the vertical housing.

6. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: There is also a dust filter at the air outlet.

7. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: The carrier gas is an inert gas, which is nitrogen or argon.

8. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: A first dust removal device is also provided between the condensation device and the in-situ detection device.

9. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: A second dust removal device is also provided between the condensation device and the mass spectrometer.

10. The in-situ detection system for gas production in aqueous batteries according to claim 1, characterized in that: A gas flow meter is also provided between the gas carrier device and the in-situ detection device.

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