Gas concentration detection method, gas concentration detection device and battery production line

Abstract

The invention relates to a gas concentration detection method, a gas concentration detection device and a battery production line. The gas concentration detection method is used for detecting the concentration of target gas in mixed gas and comprises the following steps: acquiring a first temperature value, a first pressure value and a first wind speed value of the mixed gas before the target gas is liquefied; acquiring a second temperature value, a second pressure value and a second wind speed value of mixed gas after the target gas is liquefied; and determining the concentration of the target gas in the mixed gas before the target gas is liquefied according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value. According to the gas concentration detection method, the concentration of the target gas can be detected, so that the target gas is correspondingly controlled and treated according to the detected concentration of the target gas, the explosion risk can be reduced, and the safety of battery production can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a gas concentration detection method, a gas concentration detection device, and a battery production line. Background Technology

[0002] The battery manufacturing process includes a coating process where a slurry is applied to a current collector and a drying process where the slurry is dried. During the drying process, some solvents in the slurry (such as N-methylpyrrolidone, or NMP) will evaporate and mix with air to form a mixed gas that is then discharged. However, if the concentration of N-methylpyrrolidone (NMP) is too high, the risk of explosion is high. Therefore, how to detect the concentration of N-methylpyrrolidone (NMP) in the mixed gas has become one of the urgent problems to be solved in battery production. Summary of the Invention

[0003] Therefore, it is necessary to provide a gas concentration detection method, a gas concentration detection device, and a battery production line to address the problem of how to detect the concentration of N-methylpyrrolidone (NMP) in a gas mixture.

[0004] According to a first aspect of this application, a gas concentration detection method is provided. The gas concentration detection method is used to detect the concentration of a target gas in a mixed gas. The gas concentration detection method includes: acquiring a first temperature value, a first pressure value, and a first wind speed value of the mixed gas before liquefaction of the target gas; acquiring a second temperature value, a second pressure value, and a second wind speed value of the mixed gas after liquefaction of the target gas; and determining the concentration of the target gas in the mixed gas before liquefaction of the target gas based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value.

[0005] In the technical solution of this application, after the target gas is liquefied, the volume of the mixed gas will change accordingly. The volume ratio of the liquefied target gas in the mixed gas can be determined based on the first temperature value, first pressure value, and first wind speed value detected before the target gas is liquefied, and the second temperature value, second pressure value, and second wind speed value detected after the target gas is liquefied. This determines the volume ratio of the target gas in the mixed gas before liquefaction, and thus the concentration of the target gas in the mixed gas before liquefaction. This allows for the detection of the target gas concentration, enabling appropriate control and treatment of the target gas based on the detected concentration (such as dilution of the target gas), reducing the risk of explosion and improving the safety of battery production.

[0006] In one embodiment, the concentration of the target gas in the mixed gas before liquefaction is determined based on a first temperature value, a first pressure value, a first wind speed value, a second temperature value, a second pressure value, and a second wind speed value. Specifically, this includes: determining the partial pressure of the target gas before liquefaction based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value; and determining the concentration of the target gas in the mixed gas before liquefaction based on the partial pressure of the target gas before liquefaction; wherein the partial pressure of the target gas before liquefaction is P. 目 The concentration of the target gas in the mixed gas before liquefaction is N. 目 N 目 =P 目 / P0*100%; P0 is standard atmospheric pressure. Based on the partial pressure of the target gas before liquefaction, the concentration of the target gas in the mixed gas before liquefaction can be determined more accurately, which is beneficial for better control and treatment of the target gas.

[0007] In one embodiment, the partial pressure of the target gas before liquefaction is determined based on a first temperature value, a first pressure value, a first wind speed value, a second temperature value, a second pressure value, and a second wind speed value. Specifically, this includes: determining the volume percentage λ of the target gas in the mixed gas before liquefaction based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value; wherein the first temperature value is T1, the first pressure value is P1, the first wind speed value is V2, the second temperature value is T2, the second pressure value is P2, and the second wind speed value is V2; and determining the partial pressure of the target gas before liquefaction based on the volume percentage λ of the target gas in the mixed gas before liquefaction; wherein V2 / V1=(1-λ)*P1*T2 / (P2*T1); P 目 =λ*P0+P0 / P1*P 目-T2 P0 is standard atmospheric pressure, P 目-T2 P is the saturated vapor pressure of the target gas at the second temperature. It can be understood that P... 目 =λ*P0+P0 / P1*P 目-T2 In the formula, λ*P0 is the pressure of the liquefied portion of the target gas, P0 / P1*P 目-T2 This refers to the pressure of the portion of the target gas that forms saturated vapor at the second temperature value. In this way, the partial pressure of the target gas before liquefaction can be calculated more accurately, and the concentration of the target gas (such as NMP gas) can be detected more accurately. This allows for the use of an appropriate amount of hot air (or air) to dilute the N-methylpyrrolidone (NMP) gas, thereby reducing safety risks and achieving good energy-saving effects, resulting in significant energy savings.

[0008] In one embodiment, the gas concentration detection method further includes: determining the environmental explosion hazard of the target gas based on the concentration of the target gas in the gas mixture before liquefaction; wherein the concentration of the target gas in the gas mixture before liquefaction is N. 目 The environmental explosion hazard level of the target gas is b, where b = N. 目 / a*100%, where a is the lower explosive limit of the target gas. The environmental explosion hazard of the target gas can be determined by the percentage of its concentration in the pre-liquefied gas mixture relative to its lower explosive limit. This allows for the determination of whether appropriate measures need to be taken or how much hot air (or air) should be used to dilute the N-methylpyrrolidone (NMP) gas, thereby reducing safety risks while also achieving significant energy savings and energy efficiency.

[0009] In one embodiment, the gas concentration detection method further includes displaying the concentration of the target gas in the gas mixture before liquefaction and / or the environmental explosion hazard of the target gas. This allows for a clear and immediate understanding of the concentration of the target gas in the gas mixture before liquefaction and / or the environmental explosion hazard of the target gas, facilitating intuitive judgment and processing based on these factors.

[0010] In one embodiment, the concentration of the target gas in the gas mixture before liquefaction and / or the environmental explosion hazard level of the target gas are announced via voice. This facilitates obtaining information about the concentration of the target gas in the gas mixture before liquefaction and / or the environmental explosion hazard level of the target gas, thereby enabling intuitive judgment and processing based on these factors.

[0011] According to a second aspect of this application, a gas concentration detection device is provided, comprising a gas collection mechanism, a cooling mechanism, an exhaust pipe, a first detector, and a second detector. The gas collection mechanism includes a gas collection pipe for collecting a mixed gas, the mixed gas including a target gas and air. The cooling mechanism has a gas inlet and a gas outlet. The gas collection pipe is connected to the gas inlet and configured to allow the mixed gas to flow from the gas inlet to the gas outlet. The exhaust pipe is connected to the gas outlet. The first detector is located between the gas collection pipe and the gas inlet and is used to detect a first temperature value, a first pressure value, and a first wind speed value of the mixed gas before the target gas is liquefied. The second detector is located between the gas outlet and the outlet of the exhaust pipe and is used to detect a second temperature value, a second pressure value, and a second wind speed value of the mixed gas after the target gas is liquefied. In this way, the volume ratio of the liquefied target gas in the mixed gas can be determined based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value. This allows for the determination of the volume ratio of the target gas in the mixed gas before liquefaction, and further determines the concentration of the target gas in the mixed gas before liquefaction. This enables the detection of the target gas concentration, allowing for appropriate control and treatment of the target gas based on the detected concentration (such as dilution of the target gas). This can reduce the risk of explosion and improve the safety of battery production.

[0012] In one embodiment, the gas concentration detection device further includes a controller, which is electrically connected to both a first detector and a second detector. The controller is used to determine the concentration of the target gas in the gas mixture before liquefaction based on a first temperature value, a first pressure value, a first wind speed value, a second temperature value, a second pressure value, and a second wind speed value. Since the controller determines the concentration of the target gas in the gas mixture before liquefaction based on these values, the concentration can be automatically calculated, reducing the time cost of manual calculation and improving the detection efficiency of concentration detection.

[0013] In one embodiment, the gas concentration detection device further includes a first constant-pressure tank and a first connecting pipe. The first constant-pressure tank has a first constant-pressure chamber connected to a gas collecting pipe, and the first connecting pipe connects the first constant-pressure chamber and the gas inlet. A first detector is mounted on the first connecting pipe. This ensures that the pressure of the mixed gas collected from the gas collecting pipe is kept constant within a certain range, thereby making the first pressure value measured by the first detector more accurate, and thus facilitating more accurate measurement of the concentration of the target gas in the mixed gas before liquefaction.

[0014] In one embodiment, a heat-insulating material layer is fitted onto the gas collecting pipe. This heat-insulating material layer allows the temperature of the mixed gas collected from the gas collecting pipe to be kept constant within a certain range, thereby making the first temperature value measured by the first detector more accurate. This, in turn, facilitates more accurate measurement of the concentration of the target gas in the mixed gas before liquefaction.

[0015] In one embodiment, the gas concentration detection device further includes a second constant-pressure tank with a second constant-pressure chamber connected between the gas outlet and the exhaust pipe. A second detector is mounted on the exhaust pipe. Thus, the mixed gas, cooled by the cooling mechanism, flows into the exhaust pipe through the second constant-pressure chamber, and the temperature, pressure, and wind speed of the mixed gas are detected by the second detector on the exhaust pipe. Furthermore, the second constant-pressure tank maintains the pressure of the mixed gas within a certain range, making the second pressure value measured by the second detector more accurate. This, in turn, facilitates more accurate measurement of the concentration of the target gas in the mixed gas before liquefaction.

[0016] In one embodiment, the gas concentration detection device further includes a self-regulating valve located on the exhaust pipe. The self-regulating valve can automatically regulate the pressure, flow rate, and temperature of the mixed gas after liquefaction of the target gas, reducing fluctuations in the pressure, wind speed, and temperature of the mixed gas in the exhaust pipe caused by the external environment or the pipe from which the exhaust pipe discharges. This improves the accuracy of the second temperature value, second pressure value, and second wind speed value measured by the second detector, thereby facilitating more accurate measurement of the target gas concentration in the mixed gas before liquefaction.

[0017] In one embodiment, the gas concentration detection device further includes a duct, which is connected to the inlet of a gas collecting pipe and the outlet of an exhaust pipe. The gas collecting pipe can collect the mixed gas inside the duct and detect it using the gas concentration detection device of this application to detect the concentration of the target gas in the mixed gas in the workshop where the drying equipment is located, so as to facilitate corresponding processing based on the detected concentration; and after the target gas in the mixed gas is cooled and liquefied by the cooling mechanism of the gas concentration detection device, the concentration of the target gas in the mixed gas can be reduced, and it can be safely discharged through the duct, thus saving the need for an additional emission mechanism for the gas concentration detection device.

[0018] In one embodiment, the gas collection mechanism further includes a volumetric pump, which has an inlet and an outlet connected to each other. The inlet is connected to the gas collection pipe, and the outlet is connected to the gas inlet. The volumetric pump enables the flow rate of the mixed gas flowing from the gas collection pipe into the gas inlet of the cooling mechanism to be approximately stabilized within a certain range. This facilitates more accurate detection of the first wind speed value by the first detector, and consequently, more accurate measurement of the concentration of the target gas in the mixed gas before liquefaction.

[0019] In one embodiment, the first detector includes a first wind speed sensor, a first temperature sensor, and a first pressure sensor. The first wind speed sensor detects a first wind speed value, the first temperature sensor detects a first temperature value, and the first pressure sensor detects a first pressure value. Thus, by using the first wind speed sensor to detect the first wind speed value, the first temperature sensor to detect the first temperature value, and the first pressure sensor to detect the first pressure value, the first temperature value, and the first wind speed value of the mixed gas before liquefaction of the target gas can be obtained, respectively.

[0020] In another embodiment, the first detector includes a first anemometer, which is used to detect a first temperature value, a first pressure value, and a first wind speed value. Thus, while acquiring the first temperature value, first pressure value, and first wind speed value of the mixed gas before liquefaction of the target gas, the overall performance of the first detector is improved, thereby enhancing the installation efficiency and overall integrity of the gas concentration detection device.

[0021] In one embodiment, the second detector includes a second wind speed sensor, a second temperature sensor, and a second pressure sensor. The second wind speed sensor detects a second wind speed value, the second temperature sensor detects a second temperature value, and the second pressure sensor detects a second pressure value. Thus, by using the second wind speed sensor to detect the second wind speed value, the second temperature sensor to detect the second temperature value, and the second pressure sensor to detect the second pressure value, the second temperature value, the second pressure value, and the second wind speed value of the liquefied target gas mixture can be obtained, respectively.

[0022] In another embodiment, the second detector includes a second anemometer, which is used to detect a second temperature value, a second pressure value, and a second wind speed value. Thus, while acquiring the second temperature value, second pressure value, and second wind speed value of the mixed gas after liquefaction of the target gas, the overall performance of the second detector is improved, thereby enhancing the installation efficiency and overall integrity of the gas concentration detection device.

[0023] In one embodiment, the cooling mechanism includes a condenser and a storage tank. A gas inlet and a gas outlet are located on the condenser, which also has condensation chambers communicating with the gas inlet and gas outlet respectively. The storage tank has a storage chamber communicating with the condensation chambers. The condenser can cool the mixed gas, thereby liquefying the target gas. The condensate formed after the target gas is liquefied can be stored in the storage tank, facilitating gas-liquid separation between the condensate and the mixed gas.

[0024] According to a third aspect of this application, a battery production line is provided, including the gas concentration detection device of any of the above embodiments.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 A schematic flowchart of a gas concentration detection method according to an embodiment of this application is shown.

[0028] Figure 2 A schematic flowchart of a gas concentration detection method according to another embodiment of this application is shown.

[0029] Figure 3 A schematic diagram of the gas concentration detection device according to an embodiment of this application is shown.

[0030] Figure 4 A circuit block diagram of a first detector, a second detector, a controller, and a display according to an embodiment of this application is shown.

[0031] Figure 5 A circuit block diagram of a first detector, a second detector, a controller, and a voice broadcaster according to an embodiment of this application is shown.

[0032] Figure 6 A circuit block diagram of a first detector, a second detector, and a controller according to an embodiment of this application is shown.

[0033] Reference numerals: 10. Gas concentration detection device; 110. Gas collection mechanism; 111. Gas collection pipe; 112. Volumetric pump; 1121. Pump inlet; 1122. Pump outlet; 120. Cooling mechanism; 121. Condenser; 1211. Gas inlet; 1212. Gas outlet; 1213. Condensation chamber; 122. Liquid storage tank; 1221. Liquid storage chamber; 123. Gas-liquid separation pipe; 1230. Gas-liquid separation port; 1231. Gas pipe section; 1232. Liquid pipe section; 124. Return gas pipe; 131. Exhaust pipe; 132. Self-regulating system Valve; 140, First detector; 141, First wind speed sensor; 142, First temperature sensor; 143, First pressure sensor; 150, Second detector; 151, Second wind speed sensor; 152, Second temperature sensor; 153, Second pressure sensor; 161, Controller; 162, Display; 163, Voice announcer; 171, First constant pressure tank; 1711, First constant pressure chamber; 172, First connecting pipe; 173, Second constant pressure tank; 1731, Second constant pressure chamber; 180, Thermal insulation layer; 190, Air duct. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] In the battery manufacturing process, some solvents in the slurry (such as N-methylpyrrolidone, or NMP for short) will volatilize and mix with air to form a mixed gas that is then discharged. However, if the concentration of N-methylpyrrolidone (NMP) is too high, the risk of explosion is high. Therefore, how to detect the concentration of N-methylpyrrolidone (NMP) in the mixed gas has become one of the urgent problems to be solved in battery production.

[0041] To address the problem of detecting the concentration of N-methylpyrrolidone (NMP) in a mixed gas, this application presents a gas concentration detection method and a gas concentration detection device. This device can detect the concentration of a target gas, enabling appropriate control and treatment of the target gas based on its detected concentration (such as dilution). This can reduce the risk of explosion and improve the safety of battery production.

[0042] The gas concentration detection method, gas concentration detection device, and / or battery production line disclosed in this application can be used, but are not limited to, in battery production.

[0043] Figure 1 A schematic flowchart of a gas concentration detection method according to an embodiment of this application is shown.

[0044] Please see Figure 1 According to a first aspect of this application, one embodiment of this application provides a gas concentration detection method, comprising the following steps:

[0045] S10. Obtain the first temperature value, first pressure value, and first wind speed value of the mixed gas before the target gas is liquefied.

[0046] The gas mixture includes the target gas and air. The target gas can be a volatile gas with an explosion risk, such as N-methylpyrrolidone (NMP).

[0047] The first temperature value refers to the temperature of the mixed gas before the target gas is liquefied.

[0048] The first pressure value refers to the pressure of the mixed gas before the target gas is liquefied.

[0049] The first wind speed value refers to the wind speed of the mixed gas before the target gas is liquefied.

[0050] S20. Obtain the second temperature value, second pressure value, and second wind speed value of the mixed gas after the target gas is liquefied.

[0051] The second temperature value refers to the temperature of the mixed gas after the target gas has been liquefied.

[0052] The second pressure value refers to the pressure of the mixed gas after the target gas has been liquefied.

[0053] The second wind speed value refers to the wind speed of the mixed gas after the target gas has been liquefied.

[0054] The units for the first and second temperature values ​​are the same, which can both be degrees Celsius (°C). The units for the first and second pressure values ​​are the same, which can both be kilopascals (kPa). The units for the first and second wind speed values ​​are the same, which can both be meters per second (m / s).

[0055] S30. Determine the concentration of the target gas in the mixed gas before liquefaction based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value.

[0056] After the target gas is liquefied, the volume of the mixed gas will change accordingly. The volume ratio of the liquefied target gas in the mixed gas can be determined by the first temperature, first pressure, and first wind speed values ​​detected before liquefaction, and the second temperature, second pressure, and second wind speed values ​​detected after liquefaction. This allows for the determination of the target gas's volume ratio in the mixed gas before liquefaction, and consequently, the concentration of the target gas in the mixed gas before liquefaction. This enables the detection of the target gas concentration, allowing for appropriate control and treatment of the target gas (such as dilution), reducing the risk of explosion and improving the safety of battery production.

[0057] In some embodiments, step S30, which determines the concentration of the target gas in the mixed gas before liquefaction based on a first temperature value, a first pressure value, a first wind speed value, a second temperature value, a second pressure value, and a second wind speed value, specifically includes:

[0058] S31. Determine the partial pressure of the target gas before liquefaction based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value.

[0059] S32. Determine the concentration of the target gas in the mixed gas before liquefaction based on the partial pressure of the target gas before liquefaction.

[0060] Wherein, the partial pressure of the target gas before liquefaction is P. 目 The concentration of the target gas in the mixed gas before liquefaction is N. 目 N 目 =P 目 / P0*100%, where P0 is the standard atmospheric pressure.

[0061] The partial pressure of the target gas before liquefaction refers to the pressure exerted by the target gas in the mixed gas at the same temperature when it occupies the same volume of the mixed gas before liquefaction.

[0062] Based on the partial pressure of the target gas before liquefaction, the concentration of the target gas in the mixed gas before liquefaction can be determined more accurately, which is conducive to better control and treatment of the target gas.

[0063] In some embodiments, step S31, which determines the partial pressure of the target gas before liquefaction based on a first temperature value, a first pressure value, a first wind speed value, a second temperature value, a second pressure value, and a second wind speed value, includes:

[0064] S311. Determine the volume percentage λ of the target gas in the mixed gas before liquefaction of the target gas based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value; wherein, the first temperature value is T1, the first pressure value is P1, the first wind speed value is V2, the second temperature value is T2, the second pressure value is P2, and the second wind speed value is V2.

[0065] S312. Determine the partial pressure of the target gas before liquefaction based on the volume ratio λ of the target gas in the mixed gas before liquefaction.

[0066] Where, V2 / V1=(1-λ)*P1*T2 / (P2*T1); P 目 =λ*P0+P0 / P1*P 目-T2 .

[0067] P0 is standard atmospheric pressure, P 目-T2 The saturated vapor pressure of the target gas at the second temperature value.

[0068] The volume percentage λ of the target gas in the mixed gas before liquefaction refers to the volume percentage of the target gas in the mixed gas before liquefaction.

[0069] If the target gas is not liquefied, normally, V2 / V1 = P1*T2 / (P2*T1). However, in this application, it is assumed that the volume of the mixed gas before the target gas is 1 part, then the volume of the target gas is λ. Therefore, the volume of the other gases in the mixed gas besides the target gas is 1-λ. Thus, in this application, V2 / V1 = (1-λ)*P1*T2 / 1*(P2*T1), that is, V2 / V1 = (1-λ)*P1*T2 / (P2*T1).

[0070] It's understandable, P 目 =λ*P0+P0 / P1*P 目-T2 In the formula, λ*P0 is the pressure of the liquefied portion of the target gas, P0 / P1*P 目-T2This refers to the pressure of the portion of the target gas that forms saturated vapor at the second temperature value. In this way, the partial pressure of the target gas before liquefaction can be calculated more accurately.

[0071] Compared to related technologies that use excessive hot air (or air) to dilute N-methylpyrrolidone (NMP) gas to reduce the risk of explosion (in related technologies, if the concentration of N-methylpyrrolidone (NMP) gas is too low, excessive hot air (or air) will cause a large amount of energy waste due to dilution of N-methylpyrrolidone (NMP) gas; if the concentration of N-methylpyrrolidone (NMP) gas is too high, it will lead to an excessively high risk of explosion), the gas concentration detection method of this application can more accurately detect the concentration of the target gas (such as NMP gas) so as to use an appropriate amount of hot air (or air) to dilute N-methylpyrrolidone (NMP) gas, thereby reducing safety risks while also achieving good energy-saving effects and bringing significant energy consumption benefits.

[0072] In some embodiments, please refer to Figure 2 Gas concentration detection methods also include:

[0073] S40. Determine the environmental explosion hazard of the target gas based on the concentration of the target gas in the mixed gas before liquefaction.

[0074] The concentration of the target gas in the mixed gas before liquefaction is N. 目 The environmental explosion hazard level of the target gas is b, where b = N. 目 / a*100%, where a is the lower explosive limit of the target gas.

[0075] The lower explosive limit of a target gas is the lowest concentration of the target gas in a gas mixture that would result in an explosion. This can be understood as N... 目 The unit is the same as the lower explosive limit of the target gas.

[0076] The environmental explosion hazard of a target gas refers to the degree of risk of an explosion in a gas mixture containing the target gas.

[0077] In this way, the environmental explosion hazard of the target gas can be determined based on the percentage of the target gas concentration in the mixed gas before liquefaction relative to the lower explosive limit of the target gas. This facilitates the determination of whether corresponding measures need to be taken or how much hot air (or air) should be used to dilute the N-methylpyrrolidone (NMP) gas, thereby reducing safety risks and achieving good energy-saving effects, resulting in significant energy consumption benefits.

[0078] For example, 20% is the warning threshold and 50% is the alarm threshold. When the environmental explosion hazard of the target gas is less than or equal to the warning threshold, it can be determined that no corresponding measures are needed or that a first volume of hot air (or air) should be used to dilute the N-methylpyrrolidone (NMP) gas. When the environmental explosion hazard of the target gas is greater than the warning threshold but less than the alarm threshold, it can be determined that a second volume of hot air (or air) should be used to dilute the N-methylpyrrolidone (NMP) gas. When the environmental explosion hazard of the target gas is greater than the alarm threshold, it can be determined that a third volume of hot air (or air) should be used to dilute the N-methylpyrrolidone (NMP) gas. The first volume is less than the second volume, the second volume is less than the third volume, and the units for the first, second, and third volumes are the same.

[0079] In some embodiments, please refer to Figure 2 Gas concentration detection methods also include:

[0080] S50 indicates the environmental explosion hazard level of the target gas.

[0081] The display 162 can be electrically connected to the controller 161 described below so that the environmental explosion hazard level of the target gas can be displayed on the display 162.

[0082] In other embodiments, the gas concentration detection method further includes:

[0083] S60. The environmental explosion hazard level of the target gas is announced verbally.

[0084] The voice announcer 163 can also be electrically connected to the controller 161 described below so that the voice announcer 163 can announce the environmental explosion hazard level of the target gas.

[0085] In this way, the environmental explosion hazard level of the target gas can be clearly obtained at a glance, which makes it easier to make corresponding judgments and take appropriate actions based on the environmental explosion hazard level of the target gas.

[0086] In some other embodiments, the gas concentration detection method further includes:

[0087] S70: Displays the concentration of the target gas in the mixed gas before liquefaction.

[0088] In other embodiments, the gas concentration detection method further includes:

[0089] S80, voice broadcast of the concentration of the target gas in the mixed gas before liquefaction.

[0090] In some embodiments, the gas concentration detection method further includes at least one of steps S50, S60, S70, and S80.

[0091] Please see Figure 3 According to a second aspect of this application, one embodiment of this application provides a gas concentration detection device 10, including a gas collection mechanism 110, a cooling mechanism 120, an exhaust pipe 131, a first detector 140, and a second detector 150.

[0092] The gas collection mechanism 110 includes a gas collection pipe 111 for collecting a mixed gas, wherein the mixed gas includes a target gas and air.

[0093] The gas collecting pipe 111 is a pipe used to collect the mixed gas so that the mixed gas can flow to the cooling mechanism 120.

[0094] The cooling mechanism 120 has a gas inlet 1211 and a gas outlet 1212. The gas collection pipe 111 is connected to the gas inlet 1211 and is configured to allow the mixed gas to flow through the gas inlet 1211 to the gas outlet 1212.

[0095] Cooling mechanism 120 refers to a mechanism capable of cooling the mixed gas and liquefying the target gas in the mixed gas.

[0096] Gas inlet 1211 refers to the inlet that allows the mixed gas in the gas collecting pipe 111 to flow in.

[0097] Gas outlet 1212 refers to the outlet of the cooling mechanism 120 after the mixed gas has been cooled and liquefied.

[0098] The gas collecting pipe 111 can be connected to the gas inlet 1211 by a vane pump or a positive displacement pump 112 described below.

[0099] The exhaust pipe 131 is connected to the gas outlet 1212. The exhaust pipe 131 is a gas pipe that can collect and discharge the mixed gas flowing out of the gas outlet 1212.

[0100] The first detector 140 is located between the gas collecting pipe 111 and the gas inlet 1211, and is used to detect the first temperature value, the first pressure value and the first wind speed value of the mixed gas before the target gas is liquefied. The second detector 150 is located between the gas outlet 1212 and the outlet of the exhaust pipe 131, and is used to detect the second temperature value, the second pressure value and the second wind speed value of the mixed gas after the target gas is liquefied.

[0101] The first detector 140 can be a single unit, such as an anemometer that can simultaneously detect wind speed, pressure, and temperature; the first detector 140 can also include multiple sensors that measure wind speed, pressure, and temperature separately.

[0102] The second detector 150 can be a single unit, such as an anemometer that can simultaneously detect wind speed, pressure, and temperature; the second detector 150 can also include multiple sensors that measure wind speed, pressure, and temperature separately.

[0103] In this way, the volume ratio of the liquefied target gas in the mixed gas can be determined based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value. This allows for the determination of the volume ratio of the target gas in the mixed gas before liquefaction, and further determines the concentration of the target gas in the mixed gas before liquefaction. This enables the detection of the target gas concentration, allowing for appropriate control and treatment of the target gas based on the detected concentration (such as dilution of the target gas). This can reduce the risk of explosion and improve the safety of battery production.

[0104] In some embodiments, the gas concentration detection device 10 further includes a controller 161, which is electrically connected to the first detector 140 and the second detector 150 respectively. The controller 161 is used to determine the concentration of the target gas in the mixed gas before the target gas is liquefied based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value.

[0105] The controller 161 can be used to implement the gas concentration detection method of any of the above embodiments.

[0106] Since the controller 161 is used to determine the concentration of the target gas in the mixed gas before liquefaction of the target gas based on the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value, and the second wind speed value, the controller 161 can automatically calculate the concentration of the target gas in the mixed gas before liquefaction of the target gas, reducing the time cost of manual calculation and improving the detection efficiency of concentration detection.

[0107] In some embodiments, such as Figure 4 As shown, the gas concentration detection device 10 also includes a display 162 electrically connected to the controller 161. The display 162 is used to display the concentration of the target gas in the mixed gas before the target gas is liquefied and / or the environmental explosion hazard of the target gas.

[0108] In some embodiments, such as Figure 5 As shown, the gas concentration detection device 10 also includes a voice broadcaster 163 electrically connected to the controller 161. The voice broadcaster 163 is used to broadcast the concentration of the target gas in the mixed gas before the target gas is liquefied and / or the environmental explosion hazard of the target gas.

[0109] This makes it easy to clearly see the concentration of the target gas in the mixed gas before liquefaction and / or the environmental explosion hazard of the target gas, thereby improving the detection efficiency of concentration detection.

[0110] In some embodiments, the gas concentration detection device 10 further includes a first constant pressure tank 171 and a first connecting pipe 172. The first constant pressure tank 171 has a first constant pressure chamber 1711, which is connected to the gas collecting pipe 111. The first connecting pipe 172 connects the first constant pressure chamber 1711 and the gas inlet 1211, wherein a first detector 140 is disposed on the first connecting pipe 172.

[0111] The first constant pressure tank 171 refers to a tank used to store the mixed gas before the target gas is liquefied and to stabilize the pressure of the mixed gas.

[0112] The first constant pressure chamber 1711 refers to the chamber on the first constant pressure tank 171 used to store the mixed gas before the target gas is liquefied.

[0113] In this way, the pressure of the mixed gas collected from the gas collecting pipe 111 can be kept constant within a certain range, thereby making the first pressure value measured by the first detector 140 more accurate, which in turn helps to more accurately measure the concentration of the target gas in the mixed gas before the target gas is liquefied.

[0114] In some embodiments, a heat insulation material layer 180 is provided on the gas collection pipe 111.

[0115] The heat insulation layer 180 refers to the material layer that can reduce the heat exchange between the mixed gas in the gas collecting pipe 111 and the external environment. The material of the heat insulation layer 180 can be glass fiber or asbestos, etc.

[0116] By utilizing the heat insulation material layer 180, the temperature of the mixed gas collected from the gas collecting pipe 111 can be kept constant within a certain range, thereby making the first temperature value measured by the first detector 140 more accurate, which in turn helps to more accurately measure the concentration of the target gas in the mixed gas before the target gas is liquefied.

[0117] In some embodiments, the gas concentration detection device 10 further includes a second constant pressure tank 173, the second constant pressure tank 173 having a second constant pressure chamber 1731, the second constant pressure chamber 1731 being connected between the gas outlet 1212 and the exhaust pipe 131, and the second detector 150 being disposed on the exhaust pipe 131.

[0118] The second constant pressure tank 173 refers to a tank used to store the mixed gas after the target gas has been liquefied and to stabilize the pressure of the mixed gas.

[0119] The second constant pressure chamber 1731 refers to the chamber on the second constant pressure tank 173 used to store the mixed gas after the target gas has been liquefied.

[0120] Thus, the mixed gas cooled by the cooling mechanism 120 can flow into the exhaust pipe 131 through the second constant pressure chamber 1731, and the temperature, pressure and wind speed of the mixed gas can be detected by the second detector 150 on the exhaust pipe 131. The pressure of the mixed gas can be kept constant within a certain range by the second constant pressure tank 173, so that the second pressure value measured by the second detector 150 is more accurate, which is conducive to more accurate measurement of the concentration of the target gas in the mixed gas before the target gas is liquefied.

[0121] In some embodiments, the gas concentration detection device 10 further includes a self-regulating valve 132, which is disposed on the exhaust pipe 131.

[0122] The self-regulating valve 132 can automatically regulate the pressure, flow rate, and temperature of the mixed gas after the target gas is liquefied, reducing fluctuations in the pressure, wind speed, and temperature of the mixed gas in the exhaust pipe 131 caused by the external environment or the pipe discharged from the exhaust pipe 131 (such as the air duct 190 described below). This can improve the accuracy of the second temperature value, second pressure value, and second wind speed value measured by the second detector 150, thereby facilitating a more accurate measurement of the concentration of the target gas in the mixed gas before the target gas is liquefied.

[0123] In some embodiments, the gas concentration detection device 10 further includes a duct 190, which is connected to the inlet of the gas collection pipe 111 and the outlet of the exhaust pipe 131.

[0124] One end of the duct 190 is open and can extend into the workshop where the drying equipment used in the slurry drying process is located. The other end of the duct 190 is used to extract the mixed gas in the workshop where the drying equipment is located through an exhaust fan.

[0125] The gas collection pipe 111 can collect the mixed gas in the air duct 190 and detect it through the gas concentration detection device 10 of this application to detect the concentration of the target gas in the mixed gas in the workshop where the drying equipment is located, so as to facilitate corresponding treatment according to the detected concentration; and after the target gas in the mixed gas is cooled and liquefied by the cooling mechanism 120 of the gas concentration detection device 10, the concentration of the target gas in the mixed gas can be reduced, and it can be safely discharged through the air duct 190. In this way, the additional emission mechanism set for the gas concentration detection device 10 can be saved.

[0126] In some embodiments, the gas collection mechanism 110 further includes a volumetric pump 112, which includes a pump inlet 1121 and a pump outlet 1122 that are connected to each other. The pump inlet 1121 is connected to the gas collection pipe 111, and the pump outlet 1122 is connected to the gas inlet 1211.

[0127] Compared to other pumps besides the volumetric pump 112, such as vane pumps, the volumetric pump 112 can keep the flow rate of the mixed gas flowing from the gas collection pipe 111 into the gas inlet 1211 of the cooling mechanism 120 within a certain range. This makes it easier for the first detector 140 to detect the first wind speed value more accurately, which in turn helps to measure the concentration of the target gas in the mixed gas before the target gas is liquefied more accurately.

[0128] In some embodiments, the first detector 140 includes a first wind speed sensor 141, a first temperature sensor 142, and a first pressure sensor 143. The first wind speed sensor 141 is used to detect a first wind speed value, the first temperature sensor 142 is used to detect a first temperature value, and the first pressure sensor 143 is used to detect a first pressure value.

[0129] like Figure 6 As shown, the first wind speed sensor 141, the first temperature sensor 142, and the first pressure sensor 143 can be electrically connected to the controller 161 respectively.

[0130] The first wind speed sensor 141 is a device used to detect the wind speed of the mixed gas before the target gas is liquefied, and an anemometer can be selected.

[0131] The first temperature sensor 142 is a sensor used to detect the temperature of the mixed gas before the target gas is liquefied.

[0132] The first pressure sensor 143 is a sensor used to detect the pressure of the mixed gas before the target gas is liquefied.

[0133] Thus, the first wind speed value can be detected by the first wind speed sensor 141, the first temperature value can be detected by the first temperature sensor 142, and the first pressure value can be detected by the first pressure sensor 143, thereby obtaining the first temperature value, the first pressure value, and the first wind speed value of the mixed gas before the target gas is liquefied.

[0134] In other embodiments, the first detector 140 includes a first anemometer for detecting a first temperature value, a first pressure value, and a first wind speed value.

[0135] The first anemometer is a multi-functional anemometer that can simultaneously detect the first temperature value, the first pressure value, and the first wind speed value.

[0136] The primary anemometer can be a Japanese Kanomax thermal anemometer (model KA26 or KA36), etc.

[0137] In this way, while obtaining the first temperature value, first pressure value and first wind speed value of the mixed gas before the target gas is liquefied, the overall integrity of the first detector 140 can be improved, which in turn helps to improve the installation efficiency and overall integrity of the gas concentration detection device 10.

[0138] In some embodiments, the second detector 150 includes a second wind speed sensor 151, a second temperature sensor 152, and a second pressure sensor 153. The second wind speed sensor 151 is used to detect a second wind speed value, the second temperature sensor 152 is used to detect a second temperature value, and the second pressure sensor 153 is used to detect a second pressure value.

[0139] like Figure 6 As shown, the second wind speed sensor 151, the second temperature sensor 152, and the second pressure sensor 153 can be electrically connected to the controller 161 respectively.

[0140] The second wind speed sensor 151 is a device used to detect the wind speed of the mixed gas after the target gas is liquefied, and an anemometer can be selected.

[0141] The second temperature sensor 152 is a sensor used to detect the temperature of the mixed gas after the target gas is liquefied.

[0142] The second pressure sensor 153 is a sensor used to detect the pressure of the mixed gas after the target gas is liquefied.

[0143] Thus, the second wind speed value can be detected by the second wind speed sensor 151, the second temperature value can be detected by the second temperature sensor 152, and the second pressure value can be detected by the second pressure sensor 153, thereby obtaining the second temperature value, the second pressure value, and the second wind speed value of the mixed gas after the target gas is liquefied.

[0144] In other embodiments, the second detector 150 includes a second anemometer for detecting a second temperature value, a second pressure value, and a second wind speed value.

[0145] The second anemometer is a multi-functional anemometer that can simultaneously detect a second temperature value, a second pressure value, and a second wind speed value.

[0146] The second anemometer can be a Japanese Kanomax thermal anemometer (model KA26 or KA36), etc.

[0147] In this way, while obtaining the second temperature value, second pressure value and second wind speed value of the mixed gas after the target gas is liquefied, the overall integrity of the second detector 150 can be improved, which in turn helps to improve the installation efficiency and overall integrity of the gas concentration detection device 10.

[0148] In some embodiments, the cooling mechanism 120 includes a condenser 121 and a storage tank 122, a gas inlet 1211 and a gas outlet 1212 are disposed on the condenser 121, the condenser 121 also has a condensation chamber 1213 that communicates with the gas inlet 1211 and the gas outlet 1212 respectively, and the storage tank 122 has a storage chamber 1221 that communicates with the condensation chamber 1213.

[0149] Condenser 121 refers to a device used for cooling a mixed gas and for liquefying a target gas.

[0150] Storage tank 122 refers to a tank used to store the condensate formed after the target gas is liquefied.

[0151] The mixed gas can be cooled by the condenser 121, thereby liquefying the target gas. The condensate formed after the target gas is liquefied can be stored in the storage tank 122, which facilitates the gas-liquid separation of the condensate and the mixed gas.

[0152] In this embodiment, the cooling mechanism 120 further includes a gas-liquid separation pipe 123. The gas-liquid separation pipe 123 includes a gas pipe section 1231 and a liquid pipe section 1232 connected to the bottom side of the gas pipe section 1231. The gas-liquid separation pipe 123 is provided with a gas-liquid separation port 1230, which is connected between the gas pipe section 1231 and the liquid pipe section 1232 and is connected to the gas outlet 1212. The end of the gas pipe section 1231 away from the liquid pipe section 1232 is connected to the exhaust pipe 131, and the end of the liquid pipe section 1232 away from the gas pipe section 1231 is connected to the liquid storage chamber 1221.

[0153] Thus, the condensate formed after the target gas is liquefied can flow into the liquid storage chamber 1221 through the gas outlet 1212, the gas-liquid separation port 1230 and the liquid pipe section 1232. The mixed gas after the target gas is liquefied can flow into the exhaust pipe 131 through the gas outlet 1212, the gas-liquid separation port 1230 and the gas pipe section 1231, so that the second temperature value, the second pressure value and the second wind speed value of the mixed gas can be detected by the second detector 150.

[0154] In this embodiment, the cooling mechanism 120 also includes a return air pipe 124 that communicates with the liquid storage chamber 1221 and is connected to the air duct 190.

[0155] The mixed gas flowing into the liquid storage chamber 1221 with the condensate can be discharged into the air duct 190 through the return air pipe 124, which can improve the safety of the cooling mechanism 120.

[0156] According to a third aspect of this application, one embodiment of this application provides a battery production line, including the gas concentration detection device 10 of any of the above embodiments.

[0157] The gas concentration detection device 10 can be used to detect the concentration of the target gas in the mixed gas before liquefaction, and then the target gas can be controlled and treated accordingly (such as diluting the target gas) based on the detected concentration, which can reduce the risk of explosion and improve the safety of battery production.

[0158] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A gas concentration detection method characterized by, The gas concentration detection method is used for detecting the concentration of a target gas in a mixed gas, and comprises the following steps: obtaining a first temperature value, a first pressure value and a first wind speed value of the mixed gas before the target gas is liquefied; obtaining a second temperature value, a second pressure value and a second wind speed value of the mixed gas after the target gas is liquefied; determining the concentration of the target gas in the mixed gas before the target gas is liquefied according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value.

2. The gas concentration detecting method according to claim 1, wherein The concentration of the target gas in the mixed gas before the target gas is liquefied is determined according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value, and specifically comprises the following steps: determining the gas partial pressure of the target gas before the target gas is liquefied according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value; determining the concentration of the target gas in the mixed gas before the target gas is liquefied according to the gas partial pressure of the target gas before the target gas is liquefied; Wherein, the gas partial pressure of the target gas before the target gas is liquefied is P 目 , and the concentration of the target gas in the mixed gas before the target gas is liquefied is N 目 . N 目 = P 目 / P0 * 100%; P0 is the standard atmospheric pressure.

3. The gas concentration detecting method according to claim 2, wherein The concentration of the target gas in the mixed gas before the target gas is liquefied is determined according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value, and specifically comprises the following steps: determining the volume ratio λ of the target gas in the mixed gas before the target gas is liquefied according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value; wherein the first temperature value is T1, the first pressure value is P1, the first wind speed value is V2, the second temperature value is T2, the second pressure value is P2, and the second wind speed value is V2; determining the gas partial pressure of the target gas before the target gas is liquefied according to the volume ratio λ of the target gas in the mixed gas before the target gas is liquefied; wherein V2 / V1=(1-λ)*P1*T2 / (P2*T1); P 目 = lambda * P0 + P0 / P1 * P 目-T2 ; P0 is the standard atmospheric pressure, P 目-T2 is the saturation vapor pressure of the target gas at the second temperature value.

4. The gas concentration detecting method according to any one of claims 1 to 3, characterized by, The gas concentration detection method further comprises determining the environmental explosion risk degree of the target gas according to the concentration of the target gas in the mixed gas before the target gas is liquefied. The concentration of the target gas in the mixed gas before the target gas is liquefied is N 目 , the environmental explosion risk degree of the target gas is b, b=N 目 / a*100%, and a is the lower explosion limit of the target gas.

5. The gas concentration detecting method according to claim 4, wherein The gas concentration detection method further comprises displaying the concentration of the target gas in the mixed gas before the target gas is liquefied and / or the environmental explosion risk degree of the target gas.

6. The gas concentration detecting method according to claim 4, wherein The concentration of the target gas in the mixed gas before the target gas is liquefied and / or the environmental explosion risk degree of the target gas is announced by voice.

7. A gas concentration detecting device characterized by comprising: It comprises: a gas collecting mechanism (110) comprising a gas collecting pipe (111) for collecting a mixed gas, wherein the mixed gas comprises a target gas and air; The cooling mechanism (120) has a gas inlet (1211) and a gas outlet (1212), the gas collector (111) is communicated with the gas inlet (1211), and the mixed gas can flow from the gas inlet (1211) to the gas outlet (1212); An exhaust pipe (131) is communicated with the gas outlet (1212); A first detector (140) is arranged between the gas collector (111) and the gas inlet (1211), and is used for detecting a first temperature value, a first pressure value and a first wind speed value of the mixed gas before the target gas is liquefied; And A second detector (150) is arranged between the gas outlet (1212) and the outlet of the exhaust pipe (131), and is used for detecting a second temperature value, a second pressure value and a second wind speed value of the mixed gas after the target gas is liquefied.

8. The gas concentration detecting apparatus according to claim 7, wherein The gas concentration detection device further comprises a controller (161) electrically connected with the first detector (140) and the second detector (150); The controller (161) is used for determining the concentration of the target gas in the mixed gas before the target gas is liquefied according to the first temperature value, the first pressure value, the first wind speed value, the second temperature value, the second pressure value and the second wind speed value.

9. The gas concentration detecting apparatus according to claim 7, wherein The gas concentration detection device further comprises: A first constant pressure tank (171) has a first constant pressure cavity (1711), and the first constant pressure cavity (1711) is communicated with the gas collector (111); and A first connecting pipe (172) is communicated between the first constant pressure cavity (1711) and the gas inlet (1211); The first detector (140) is arranged on the first connecting pipe (172).

10. The gas concentration detecting apparatus according to claim 7, wherein The gas collector (111) is sleeved with a layer of heat insulation material (180).

11. The gas concentration detecting apparatus according to claim 7, wherein The gas concentration detection device further comprises a second constant pressure tank (173), and the second constant pressure tank (173) has a second constant pressure cavity (1731) communicated between the gas outlet (1212) and the exhaust pipe (131); The second detector (150) is arranged on the exhaust pipe (131).

12. The gas concentration detecting apparatus according to claim 7, wherein The gas concentration detection device further comprises a self-operated regulating valve (132) arranged on the exhaust pipe (131).

13. The gas concentration detecting apparatus according to claim 12, wherein The gas concentration detection device further comprises an air pipe (190); The air pipe (190) is respectively communicated with the inlet of the gas collector (111) and the outlet of the exhaust pipe (131).

14. The gas concentration detecting apparatus according to claim 7, wherein The gas collecting mechanism (110) further comprises a volumetric pump (112), and the volumetric pump (112) comprises a pump inlet (1121) and a pump outlet (1122) communicated with each other, the pump inlet (1121) is communicated with the gas collector (111), and the pump outlet (1122) is communicated with the gas inlet (1211).

15. The gas concentration detecting apparatus according to claim 7, wherein The first detector (140) comprises a first wind speed sensor (141), a first temperature sensor (142) and a first pressure sensor (143); the first wind speed sensor (141) is used for detecting the first wind speed value; the first temperature sensor (142) is used for detecting the first temperature value; and the first pressure sensor (143) is used for detecting the first pressure value; or The first detector (140) comprises a first wind speed sensor, which is used for detecting the first temperature value, the first pressure value and the first wind speed value.

16. The gas concentration detecting apparatus according to claim 7, wherein The second detector (150) comprises a second wind speed sensor (151), a second temperature sensor (152) and a second pressure sensor (153); the second wind speed sensor (151) is used for detecting the second wind speed value; the second temperature sensor (152) is used for detecting the second temperature value; and the second pressure sensor (153) is used for detecting the second pressure value; or The second detector (150) comprises a second wind speed sensor, which is used for detecting the second temperature value, the second pressure value and the second wind speed value.

17. The gas concentration detecting apparatus according to claim 7, wherein The cooling mechanism (120) comprises a condenser (121) and a liquid storage tank (122); The gas inlet (1211) and the gas outlet (1212) are arranged on the condenser (121); The condenser (121) further has a condensing cavity (1213) in communication with the gas inlet (1211) and the gas outlet (1212) respectively; The liquid storage tank (122) has a liquid storage cavity (1221) in communication with the condensing cavity (1213).

18. A battery production line, characterized by The gas concentration detection device as claimed in any one of claims 7-17.

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