Production microenvironment device of sulfide all-solid-state battery and control method

Abstract

The invention provides a production microenvironment device of a sulfide all-solid-state battery and a control method, and relates to the technical field of solid-state battery production. The small production environment device for the sulfide all-solid-state battery comprises an isolation bin mechanism, a sealing cover mechanism, a vacuum pipeline, a hydrogen sulfide exhaust pipeline and a fresh air assembly, the isolation bin mechanism is connected with the sealing cover mechanism; the production mechanism of the sulfide all-solid-state battery is mounted in the sealing cover mechanism; the vacuum pipeline and the isolation bin mechanism are arranged in a matched mode, and the vacuum pipeline communicates with the internal space of the isolation bin mechanism; the fresh air assembly comprises a sealing cover fresh air mechanism and an isolation bin fresh air mechanism, the sealing cover fresh air mechanism is connected with the sealing cover mechanism, the isolation bin fresh air mechanism is connected with the isolation bin mechanism, and the hydrogen sulfide exhaust pipeline communicates with the inner space of the sealing cover mechanism. The production microenvironment device of the sulfide all-solid-state battery can achieve the technical effect of improving the development efficiency and the production efficiency of the sulfide all-solid-state battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of solid-state battery production, and in particular to a production microenvironment device and control method for sulfide all-solid-state batteries. Background Art

[0002] There are three main technical routes for all-solid-state batteries: polymer, sulfide, and oxide. At present, the ionic conductivity of sulfide solid electrolytes has initially met the requirements, and subsequent material modification can further improve the ionic conductivity and environmental adaptability. The sulfide system has high technical maturity, rapid development progress, and is most likely to be mass-produced in the short term. It is the best overall choice. Major car companies on the market have all taken sulfide as the preferred technical route for all-solid-state electrolyte materials and the main development direction.

[0003] Generally, sulfide solid electrolytes (such as Li6PS5Cl) will produce hydrogen sulfide (H2S) in a dry environment with moisture. Hydrogen sulfide is a colorless, highly toxic acidic gas. According to the "GBZT 259-2014 Guidelines for Occupational Hazard Protection of Hydrogen Sulfide", the upper limit of occupational exposure to hydrogen sulfide is ≤10mg / m 3 . During the development and trial production of sulfide all-solid-state batteries, for the sake of personnel safety, it is necessary to specially control the amount and range of hydrogen sulfide release. Existing patents and literature have not yet provided an effective hydrogen sulfide release control device during the production of sulfide all-solid-state batteries and a general control logic solution within the device. It is impossible to effectively control the concentration of hydrogen sulfide under multiple working conditions, and it is impossible to effectively guide the development and construction of sulfide all-solid-state battery production lines, which leads to low development efficiency and production efficiency of sulfide all-solid-state batteries. Summary of the invention

[0004] The purpose of the present application is to provide a production microenvironment device and control method for a sulfide all-solid-state battery, which can achieve the technical effect of improving the development efficiency and production efficiency of sulfide all-solid-state batteries.

[0005] In a first aspect, the present application provides a production microenvironment device for a sulfide all-solid-state battery, including an isolation chamber mechanism, a sealing cover mechanism, a vacuum pipeline, a hydrogen sulfide exhaust pipeline, and a fresh air component;

[0006] The isolation chamber mechanism is connected to the sealing cover mechanism, and a production mechanism for a sulfide all-solid-state battery is installed inside the sealing cover mechanism;

[0007] The vacuum pipeline is matched with the isolation chamber mechanism, wherein the vacuum pipeline is connected to the internal space of the isolation chamber mechanism;

[0008] The fresh air component includes a sealed cover fresh air mechanism and an isolated chamber fresh air mechanism. The sealed cover fresh air mechanism is connected to the sealed cover mechanism, the isolated chamber fresh air mechanism is connected to the isolated chamber mechanism, and the hydrogen sulfide exhaust pipeline is connected to the internal space of the sealed cover mechanism.

[0009] In the above-mentioned implementation process, the production microenvironment device of the sulfide all-solid-state battery is the first microenvironment device and the enclosed battery cell box for loading and unloading that are suitable for the production of sulfide all-solid-state batteries. The selected materials and structural methods meet the performance requirements of the structural strength, sealing structure, corrosion resistance and other performance requirements of the environmental room for the production of sulfide all-solid-state batteries; in addition, the control logic meets the needs of multiple working conditions, can be used for various types of equipment and realize centralized control of the entire line, with less development cost for the entire line, which is conducive to centralized control of the entire line; thus, the production microenvironment device of the sulfide all-solid-state battery can achieve the technical effect of improving the development efficiency and production efficiency of sulfide all-solid-state batteries.

[0010] Furthermore, the production microenvironment device also includes a movable door assembly, which includes at least one movable door. The movable door and the sealing cover mechanism are locked and sealed by means of fluororubber sealing gaskets and sealant, and the hinges of the movable door are sealed by sealing welding.

[0011] In the above implementation process, the movable door and the sealing cover mechanism, as well as the hinges of the movable door, are sealed to prevent leakage of hydrogen sulfide gas.

[0012] Furthermore, the sealing cover mechanism is provided with a device observation window, which is a transparent observation window of antistatic modified corrosion-resistant polycarbonate, and the device observation window and the sheet metal of the sealing cover mechanism are sealed by a silicone pad.

[0013] In the above implementation process, the equipment observation window is made of anti-static modified corrosion-resistant polycarbonate, and a silicone pad is used to seal between the PC board and the sheet metal, which ensures the sealing performance while not affecting the internal observation of the sealing cover mechanism.

[0014] Furthermore, the production microenvironment device also includes a PLC control cabinet, and the sealed cover fresh air mechanism includes a communication mechanism and a variable frequency fan, and the communication mechanism is electrically connected to the variable frequency fan and the PLC control cabinet respectively.

[0015] Furthermore, the sealing cover fresh air mechanism is distributedly arranged on the top of the hood of the sealing cover mechanism, and the sealing cover fresh air mechanism is equipped with a check valve.

[0016] In the above implementation process, the fresh air mechanism of the sealed hood is arranged on the top of the hood, with a distributed layout and equipped with a check valve to ensure that the gas can only enter but not exit.

[0017] Furthermore, each pipeline of the vacuum pipeline and the hydrogen sulfide exhaust pipeline is locked and sealed by means of flanges and fluororubber sealing gaskets, and the interior of the sealing cover mechanism is in a slightly negative pressure state.

[0018] In the above implementation process, a slightly negative pressure state (such as -10 to -30 Pa) needs to be maintained inside the equipment to prevent hydrogen sulfide gas inside the equipment from leaking into the workshop.

[0019] Furthermore, the ratio of the gap leakage area to the overall surface area of ​​the production microenvironment device is less than or equal to 0.04%.

[0020] In the above implementation process, the connection between the various structures of the small environment cover and the logistics between the various equipment are ensured through the transportation of closed battery boxes for loading and unloading to meet the sealing requirements in the production process of sulfide all-solid-state batteries.

[0021] In a second aspect, the present application provides a control method, which is applied to the production microenvironment device of the sulfide all-solid-state battery described in the first aspect, and the control method comprises:

[0022] Acquire sensor information of the production microenvironment device, wherein the sensor information includes one or more sensor information of a wind pressure sensor, a hydrogen sulfide sensor, and a dew point temperature sensor;

[0023] Process the sensor information according to preset control logic to generate control instructions;

[0024] The sealing cover fresh air mechanism and the isolation chamber fresh air mechanism are controlled according to the control instructions.

[0025] In the above implementation process, the control logic meets the needs of multiple working conditions, can be used for various types of equipment and realize centralized control of the entire line, with lower development costs for the entire line, which is conducive to centralized control of the entire line; thus, the control method can achieve the technical effect of improving the development efficiency and production efficiency of sulfide all-solid-state batteries.

[0026] Further, the step of controlling the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the control instruction includes:

[0027] The sealing cover fresh air mechanism and the isolation chamber fresh air mechanism are respectively connected to a PLC control cabinet, and the PLC control cabinet controls the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to preset working conditions and the control instructions.

[0028] Furthermore, the preset working conditions include continuous production working conditions, loading and unloading working conditions and accident working conditions, the production microenvironment device of the sulfide all-solid-state battery also includes an accident emergency exhaust fan, and the PLC control cabinet controls the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the preset working conditions and the control instructions, including:

[0029] Detecting the current working condition of the production microenvironment device of the sulfide all-solid-state battery;

[0030] If the current working condition is a continuous production working condition, a first control instruction is generated, and under the first control instruction, the air supply volume of the fresh air mechanism of the sealing cover is less than the exhaust volume of the hydrogen sulfide exhaust pipeline;

[0031] If the current working condition is a loading and unloading working condition, a second control instruction is generated, and under the second control instruction, the difference between the air supply volume of the fresh air mechanism of the sealing cover and the exhaust volume of the hydrogen sulfide exhaust pipeline is greater than the preset air volume value;

[0032] If the current operating condition is an accident operating condition, a third control instruction is generated, and the air supply volume of the fresh air mechanism of the sealing cover under the third control instruction is less than the total value of the exhaust volume of the hydrogen sulfide exhaust pipeline and the exhaust volume of the accident emergency exhaust fan.

[0033] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0034] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application;

[0037] Figure 2 A structural front view of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application;

[0038] Figure 3 A top view of the structure of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application;

[0039] Figure 4 A structural side view of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application;

[0040] Figure 5 A flow chart of a control method provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of the change of hydrogen sulfide concentration under continuous working conditions provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of the change of water volume under continuous working conditions provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of changes in hydrogen sulfide concentration under accident conditions provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of the change in water volume under accident conditions provided in an embodiment of the present application.

[0045] Figure numerals: isolation chamber mechanism 100; sealing cover mechanism 200; vacuum pipeline 300; hydrogen sulfide exhaust pipeline 400; fresh air assembly 500; sealing cover fresh air mechanism 510; isolation chamber fresh air mechanism 520; movable door assembly 600; movable door 610; PLC control cabinet 700. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0047] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0051] The equipment cover of the existing lithium battery production line cannot meet the production of sulfide all-solid-state batteries. The disadvantages are as follows:

[0052] ① The existing equipment cover does not take sealing into consideration, and the gas generated during the equipment production process will escape to the outside of the equipment cover without restriction, and the escape of hydrogen sulfide generated during the production of sulfide all-solid-state batteries cannot be effectively controlled;

[0053] ② The material selection of the existing equipment cover does not take into account the protection against hydrogen sulfide corrosion. The equipment cover is in an environment containing hydrogen sulfide for a long time and cannot effectively maintain the protection requirements of the equipment cover against hydrogen sulfide;

[0054] ③ The air pressure inside the existing equipment cover is usually a positive pressure environment, which cannot form a negative pressure inside the equipment cover environment. The positive pressure condition outside the equipment cover environment controls the escape of hydrogen sulfide;

[0055] ④ The existing equipment cover ventilation conditions are relatively simple, with only FFU air intake and FFU is a fixed-frequency fan, which cannot achieve dynamic adjustment of the control of hydrogen sulfide concentration under different working conditions.

[0056] Based on this, it is necessary to design a highly reliable small environment device suitable for the production of sulfide all-solid-state batteries and the general control logic of the device to solve the following problems:

[0057] ① Provide a new device structure (small environment cover) that can fully seal the equipment that produces hydrogen sulfide, while achieving negative pressure in the device environment to control the release range of hydrogen sulfide;

[0058] ② Provide general control logic and control objectives in the small environment cover under multiple working conditions;

[0059] ③ Provide simulation effect of small environment cover on the control of hydrogen sulfide release range, and provide scientific basis for production line construction.

[0060] The key technologies mainly include: the first hydrogen sulfide release range control device structure (small environment cover), optimization of the small environment cover control logic, meeting the needs of dynamic hydrogen sulfide balance under multiple working conditions, thereby ensuring the safety and reliability of battery cell development.

[0061] See also Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the production microenvironment device of the sulfide all-solid-state battery provided in the embodiment of the present application, Figure 2 This is a structural front view of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application. Figure 3 A top view of the structure of the production microenvironment device of the sulfide all-solid-state battery provided in the embodiment of the present application, Figure 4 A structural side view of a production microenvironment device for a sulfide all-solid-state battery provided in an embodiment of the present application; the production microenvironment device for a sulfide all-solid-state battery comprises an isolation chamber mechanism 100, a sealing cover mechanism 200, a vacuum pipeline 300, a hydrogen sulfide exhaust pipeline 400 and a fresh air assembly 500;

[0062] Exemplarily, the isolation chamber mechanism 100 is connected to the sealing cover mechanism 200, and the production mechanism of the sulfide all-solid-state battery is installed inside the sealing cover mechanism 200;

[0063] Exemplarily, the vacuum pipeline 300 is matched with the isolation chamber mechanism 100, wherein the vacuum pipeline 300 is connected to the internal space of the isolation chamber mechanism 100;

[0064] Exemplarily, the fresh air assembly 500 includes a sealed cover fresh air mechanism 510 and an isolation chamber fresh air mechanism 520, the sealed cover fresh air mechanism 510 is connected to the sealed cover mechanism 200, the isolation chamber fresh air mechanism 520 is connected to the isolation chamber mechanism 100, and the hydrogen sulfide exhaust duct 400 is connected to the internal space of the sealed cover mechanism 200.

[0065] Illustratively, the production microenvironment device of the sulfide all-solid-state battery is the first of its kind, a microenvironment device and a closed battery cell box for loading and unloading suitable for the production of sulfide all-solid-state batteries. The selected materials and structural methods meet the performance requirements of the environmental room for the production of sulfide all-solid-state batteries, such as structural strength, sealing structure, and corrosion resistance. In addition, the control logic meets the needs of multiple working conditions and can be used for various types of equipment to achieve centralized control of the entire line. The development cost of the entire line is lower, which is conducive to centralized control of the entire line. Thus, the production microenvironment device of the sulfide all-solid-state battery can achieve the technical effect of improving the development efficiency and production efficiency of sulfide all-solid-state batteries.

[0066] Exemplarily, the production microenvironment device also includes a movable door assembly 600, which includes at least one movable door 610. The movable door 610 and the sealing cover mechanism 200 are locked and sealed by means of fluororubber sealing gaskets and sealants, and the hinges of the movable door are sealed by sealing welding.

[0067] Exemplarily, the movable door 610 and the sealing cover mechanism 200, as well as the hinges of the movable door 610, are sealed to prevent leakage of hydrogen sulfide gas.

[0068] Exemplarily, the sealing cover mechanism is provided with a device observation window, which is a transparent observation window of antistatic modified corrosion-resistant polycarbonate, and the device observation window and the sheet metal of the sealing cover mechanism are sealed by a silicone pad.

[0069] Exemplarily, the equipment observation window is made of anti-static modified corrosion-resistant polycarbonate, and a silicone pad is used to seal the PC board and the sheet metal, thereby ensuring the sealing performance without affecting the internal observation of the sealing cover mechanism.

[0070] Exemplarily, the production microenvironment device also includes a PLC control cabinet 700, and the sealed cover fresh air mechanism 510 includes a communication mechanism and a variable frequency fan, and the communication mechanism is electrically connected to the variable frequency fan and the PLC control cabinet 700 respectively.

[0071] Exemplarily, the sealed cover fresh air mechanism 510 is distributedly arranged on the top of the hood of the sealed cover mechanism 200, and the sealed cover fresh air mechanism 510 is equipped with a check valve.

[0072] Exemplarily, the sealed hood fresh air mechanism 510 is arranged on the top of the hood, with a distributed layout and equipped with a check valve to ensure that the gas can only enter but not exit.

[0073] Exemplarily, each pipeline of the vacuum pipeline 300 and the hydrogen sulfide exhaust pipeline 400 is locked and sealed by means of flanges and fluororubber sealing gaskets, and the interior of the sealing cover mechanism 200 is in a slightly negative pressure state.

[0074] For example, a slightly negative pressure state (such as -10 to -30 Pa) needs to be maintained inside the equipment to prevent hydrogen sulfide gas inside the equipment from leaking into the workshop.

[0075] Exemplarily, the ratio of the gap leakage area to the overall surface area of ​​the production microenvironment device is less than or equal to 0.04%.

[0076] Exemplarily, the connection between the various structures of the small environment cover and the logistics between the various equipment are ensured to meet the sealing requirements in the production process of sulfide all-solid-state batteries through the transportation of closed battery boxes for loading and unloading.

[0077] See also Figure 5 , Figure 5 A flow chart of a control method provided in an embodiment of the present application, wherein the control method is applied to Figures 1 to 4 The production microenvironment device of the sulfide all-solid-state battery shown in the figure, and the control method include:

[0078] S100: Acquire sensor information of a production microenvironment device, where the sensor information includes one or more sensor information of a wind pressure sensor, a hydrogen sulfide sensor, and a dew point temperature sensor;

[0079] S200: Processing sensor information according to preset control logic to generate control instructions;

[0080] S300: Control the fresh air mechanism of the sealed cover and the fresh air mechanism of the isolation chamber according to the control instructions.

[0081] Exemplarily, the control logic meets the needs of multiple working conditions, can be used for various types of equipment and realize centralized control of the entire line, with lower development costs for the entire line, which is conducive to centralized management and control of the entire line; thus, the control method can achieve the technical effect of improving the development efficiency and production efficiency of sulfide all-solid-state batteries.

[0082] Exemplarily, S300: the step of controlling the fresh air mechanism of the sealing cover and the fresh air mechanism of the isolation chamber according to the control instruction includes:

[0083] The sealing cover fresh air mechanism and the isolation chamber fresh air mechanism are respectively connected to the PLC control cabinet, and the PLC control cabinet controls the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the preset working conditions and control instructions.

[0084] Exemplarily, the preset working conditions include continuous production working conditions, loading and unloading working conditions and accident working conditions. The production microenvironment device of the sulfide all-solid-state battery also includes an accident emergency exhaust fan. The steps of the PLC control cabinet controlling the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the preset working conditions and control instructions include:

[0085] Detect the current working conditions of the production microenvironment device of sulfide all-solid-state batteries;

[0086] If the current working condition is a continuous production working condition, a first control instruction is generated, and under the first control instruction, the air supply volume of the fresh air mechanism of the sealing cover is less than the exhaust volume of the hydrogen sulfide exhaust pipeline;

[0087] If the current working condition is a loading and unloading working condition, a second control instruction is generated, and under the second control instruction, the difference between the air supply volume of the fresh air mechanism of the sealing cover and the exhaust volume of the hydrogen sulfide exhaust pipeline is greater than the preset air volume value;

[0088] If the current operating condition is an accident condition, a third control instruction is generated. Under the third control instruction, the air supply volume of the fresh air mechanism of the sealing cover is less than the total value of the exhaust volume of the hydrogen sulfide exhaust pipeline and the exhaust volume of the accident emergency exhaust fan.

[0089] In some embodiments, in combination Figures 1 to 5 The production microenvironment device and control method of the sulfide all-solid-state battery shown in the figure, the specific implementation steps are as follows:

[0090] Environmental conditions in the small environment hood: ambient temperature 25℃±4℃, cleanliness level 100,000. The working conditions are divided into continuous production conditions (fully enclosed small environment hood), short-term loading and unloading conditions (small environment hood movable door open, including short-term maintenance of faults), and accident conditions;

[0091] If all environmental monitoring parameters are within the defined parameters, it is defined as a continuous production condition. If all environmental monitoring parameters are within the defined parameters and the movable door is in the open state, it is defined as a short-term loading and unloading condition. If one or more environmental monitoring parameters are abnormal, it is defined as an accident condition. The environmental monitoring definition parameters of each condition are calibrated as shown in Table 1:

[0092] Table 1- Environmental conditions definition parameters

[0093] Working condition type Hydrogen sulfide concentration Dew point Wind pressure Continuous production conditions ≤5ppm -35℃～-30℃ -30Pa~-10Pa Short-term loading and unloading conditions 5ppm~10ppm -60℃～-35℃ -50Pa~-30Pa Accident conditions >10ppm -30℃ and above -50Pa and below

[0094] Among them, the input module is responsible for receiving signals from the wind pressure sensor, hydrogen sulfide sensor and dew point meter arranged in the plant space and the small environment cover. The output module is responsible for sending control signals to the FFU, process exhaust fan and accident emergency exhaust fan. The PLC control cabinet outputs the corresponding control signal according to the state change of the input signal after program logic processing. The PLC control cabinet controls the FFU, process exhaust fan and accident emergency exhaust fan through the internally stored program (ladder diagram, function block diagram, instruction list or structured text).

[0095] Wind pressure sensors, hydrogen sulfide sensors and dew point meters are arranged in the plant space and the small environment cover, and connected to the PLC control cabinet through the RS485 protocol. The PLC control cabinet centrally monitors the data of wind pressure sensors, hydrogen sulfide sensors and dew point meters in the whole plant. After the wind pressure sensors, hydrogen sulfide sensors and dew point meters exceed the limit, they will send communication signals to the PLC control cabinet. FFU, process exhaust fans and accident emergency exhaust fans are uniformly controlled by the PLC control cabinet. The specific working conditions are as follows:

[0096] (1) Continuous production condition control logic: The PLC control cabinet monitors the parameters of the wind pressure sensor, hydrogen sulfide sensor and dew point meter. The PLC control cabinet transmits signals to the FFU system in the small environment device to supply air and the process exhaust fan to exhaust. Under this condition, the FFU air supply volume is less than the process exhaust fan exhaust volume to maintain a low dew point and a slight negative pressure in the small environment hood.

[0097] (2) Control logic for short-term loading and unloading conditions: The PLC control cabinet monitors the parameters of the wind pressure sensor, hydrogen sulfide sensor and dew point meter. The PLC control cabinet transmits signals to the FFU system in the small environment device to reduce air supply and increase the exhaust volume of the process exhaust fan to form a relatively large negative pressure environment inside the small environment hood, so that the small environment hood door opening is constantly in a negative pressure state to ensure that hydrogen sulfide does not escape at the door opening. Under this condition, the FFU air supply volume is less than the exhaust volume of the process exhaust fan to achieve a low dew point and a slight negative pressure in the small environment hood.

[0098] (3) Accident condition control logic: The PLC control cabinet monitors the parameters of the wind pressure sensor, hydrogen sulfide sensor and dew point meter. When the parameters exceed the limit, the PLC control cabinet transmits a signal to the small environment device to increase the air supply of the FFU system and turn on the process exhaust fan and the accident emergency exhaust fan for exhaust. Under this condition, the FFU air supply volume is less than the exhaust volume of the process exhaust fan + the exhaust volume of the accident emergency exhaust fan, so as to quickly reduce the hydrogen sulfide concentration in the small environment hood.

[0099] Table 2-PLC centralized control cabinet control mode

[0100]

[0101] (1) The development concept of environmental hydrogen sulfide control in the plant: the outside of the room is at atmospheric pressure, the inside of the room is at a slightly positive pressure (5Pa to 30Pa), the inside of the equipment (small environment cover) is at a slightly negative pressure (-10Pa to -30Pa), and the pipeline between the small environment cover and the exhaust gas treatment system is at a negative pressure (-10Pa to -100Pa);

[0102] (2) The external space of the factory is at atmospheric pressure. The dehumidifier supplies air to control the dew point of the factory space. The air supply duct is equipped with a check valve to prevent hydrogen sulfide from overflowing. At the same time, a slight positive pressure is maintained in the factory space. The return air from the dehumidifier is treated with hydrogen sulfide by a hydrogen sulfide absorber to prevent hydrogen sulfide from corroding the dehumidifier unit;

[0103] (3) The small environment hood (inside the equipment) is actively supplied with air in the factory through the FFU variable frequency fan, and the FFU is equipped with a check valve to prevent hydrogen sulfide from overflowing. The small environment hood is equipped with a variable frequency fan for process exhaust and a variable frequency fan for emergency exhaust to control the concentration of hydrogen sulfide in the small environment hood while maintaining a slight negative pressure (-10Pa to -30Pa) in the small environment hood, thereby inhibiting the diffusion of hydrogen sulfide in the equipment;

[0104] (4) An RTO system is arranged outside the plant to chemically neutralize the hydrogen sulfide in the process exhaust fan and the emergency exhaust fan ducts, while maintaining a slight negative pressure in the ducts to prevent hydrogen sulfide backflow.

[0105] For example, the internal volume of the simulation model is 24.2m 3 The leakage area of ​​the door panel gap accounts for 0.04% of the total surface area (0.035m 2 ), 1m 3 The cell volatilizes to produce 3.34ppm / min (2.145mg / s) of hydrogen sulfide, and the whole equipment volatilizes 1.913mg / s. The hydrogen sulfide concentration C under the accident condition is calculated, and the calculation formula for the hydrogen sulfide volatilization amount X is as follows:

[0106]

[0107] in:

[0108] C--mg / m 3 ;

[0109] ppm - parts per million;

[0110] MW--molecular weight of the substance, hydrogen sulfide 34.15;

[0111] 24.05--The volume of 1 mol of gas at 20℃ and 101.3KPa;

[0112] V--Equipment effective volume 24.2m 3 .

[0113] Exemplarily, the production microenvironment device of the sulfide all-solid-state battery provided in the embodiment of the present application is an innovative device structure, wherein:

[0114] 1. Small environment hood:

[0115] (1) Development ideas of small environment cover:

[0116] The leakage area of ​​the small environmental cover gap accounts for 0.04% of the total surface area;

[0117] The material selection of the small environment cover meets the requirements of hydrogen sulfide corrosion resistance;

[0118] The strength simulation of the small environment cover mechanism meets the positioning vibration requirements of the production environment;

[0119] The small environment cover should reserve sufficient space for human flow, logistics and maintenance.

[0120] (2) The sheet metal protection plate of the equipment is made of 304 or Q235B (painted) with a thickness of 1.5 mm;

[0121] (3) The equipment wire holes are sealed with rubber plugs (through-wall plates);

[0122] (4) The top cover of the equipment hood is sealed by full welding;

[0123] (5) The joints between hoods are locked and sealed by stainless steel + fluororubber gaskets;

[0124] (6) There must be a fluororubber protective pad at the connection support plate between the hood and the frame, and the square surface at the bottom of the hood must fit tightly with the support plate to ensure the sealing of the hood after installation;

[0125] (7) After assembly, apply glue around the outer edge of the joint to ensure that the hood is completely sealed and leak-proof.

[0126] 2. Movable door:

[0127] (1) The movable door is made of 304 or Q235B (painted) with a thickness of 1.5 mm;

[0128] (2) The hood door is locked and sealed by using fluororubber gasket + sealant;

[0129] (3) The hinges of the movable door are sealed by blocking welding;

[0130] (4) The equipment observation window is made of anti-static modified corrosion-resistant polycarbonate PC+PTFE+PUR (transparent), and a silicone pad is used to seal the PC board and the sheet metal.

[0131] 3. Hood FFU system:

[0132] (1) FFU must be equipped with RS485 communication and variable frequency fan, and the equipment must be made of stainless steel;

[0133] (2) FFU realizes group control and partition control through the PLC control cabinet touch screen, and can monitor or monitor the operating status of each FFU;

[0134] (3) The FFU is arranged on the top of the hood in a distributed layout, and a check valve is installed at the FFU to ensure that gas can only enter but not exit.

[0135] 4. Upper hood duct:

[0136] (1) The pipelines are locked and sealed by flange + fluororubber sealing gasket;

[0137] (2) A slightly negative pressure state (-10 to -30 Pa) must be maintained inside the equipment to prevent hydrogen sulfide gas from leaking into the workshop.

[0138] For example, the connection between the various structures of the small environment cover and the logistics between the various equipment are transported through the closed battery box for loading and unloading to meet the sealing requirements in the production process of sulfide all-solid-state batteries (the leakage surface of the door panel gap accounts for 0.04% of the total surface area); the equipped FFU and pipeline system ensure a slightly negative pressure state (-10~30pa) to prevent the hydrogen sulfide gas inside the equipment from leaking into the workshop; the small environment cover components and sealing devices are made of anti-corrosion materials to ensure full sealing of the equipment under production conditions containing hydrogen sulfide;

[0139] In some implementation scenarios, examples of simulation effects of the production microenvironment device and control method of the sulfide all-solid-state battery provided in the embodiments of the present application are as follows:

[0140] Simulation condition settings:

[0141] Process exhaust: exhaust air volume 1467m 3 / h, the pipe diameter is 98mm, and the exhaust air velocity is calculated to be 54m / s;

[0142] Emergency exhaust: exhaust air volume 2219m 3 / h, the pipe diameter is 98mm, and the exhaust air velocity is calculated to be 81.72m / s;

[0143] Set the initial multi-component concentration: hydrogen sulfide accounts for 10mg / m 3 (7.04ppm), water accounts for 376ppm, and the rest is air components;

[0144] Set the air intake conditions: the total air volume of the six FFUs under process exhaust conditions is 1467m 3 / h; under the condition of accident exhaust, the total air volume of six FFU intakes is 2179m 3 / h; of which hydrogen sulfide accounts for 0, water accounts for 38.8ppm (dew point temperature -30℃), and the rest is air;

[0145] Set the leakage surface pressure to the external atmospheric pressure, where the proportion of hydrogen sulfide is 0, the proportion of water is 376ppm (dew point temperature -30℃), and the rest is air;

[0146] Set the cell area as the hydrogen sulfide volatilization surface, with a volatilization rate of 3.34ppm / min (1.913mg / s);

[0147] Set the gravity field G;

[0148] Set the entire outer surface to wall.

[0149] The simulation results are shown below:

[0150] 1. Continuous production conditions:

[0151] Volume change curve of each component:

[0152] Under the current simulation conditions, the volume components of internal hydrogen sulfide and water show a clear downward trend. Figure 6 A schematic diagram of the change of hydrogen sulfide concentration under continuous working conditions provided in the embodiment of the present application, Figure 7 A schematic diagram of the change of water volume under continuous working conditions provided in an embodiment of the present application;

[0153] Exhaust air volume 1467m 3 / h, fresh air intake volume 1441m 3 / h, when the exhaust is turned on for 120s, the average concentration of hydrogen sulfide increases from 5mg / m 3 (3.52ppm) reduced to 0.295mg / m 3 (0.416ppm). When the ambient moisture content is 376ppm and the intake air moisture content is 38.8ppm (-30℃), after 120s of exhaust ventilation, the moisture content inside the whole machine is 83.34ppm, reaching the dew point requirement of -42℃ and meeting the dew point requirement of -35℃~-30℃.

[0154] The component volume cloud diagram is displayed in the form of a cross-sectional diagram, and some results are presented in the form of multiple cross-sectional axonometric diagrams. The simulation results are the internal conditions of the model at 150s.

[0155] For the hydrogen sulfide component, the concentration in most areas inside the whole machine is below 5ppm. There is a small amount of hydrogen sulfide accumulation below the door panel at the far end of the exhaust vent, which can be solved by blocking the slit of the door panel in the area. For the moisture component, the content in most areas inside the whole machine is below 100ppm, and the accumulation location is the same as that of hydrogen sulfide.

[0156] There is no obvious partition area inside the whole machine, so the pressure in the area except the negative pressure pipe is almost the same.

[0157] Under process exhaust, when the fresh air intake coefficient (fresh air intake coefficient = intake air volume ÷ exhaust air volume) is 0.982, the inside of the whole machine is in a negative pressure state, and the maximum negative pressure value detected is -0.0083pa.

[0158] 2. Accident conditions:

[0159] Volume change curve of each component:

[0160] Under the current simulation conditions, the volume components of internal hydrogen sulfide and water show a clear downward trend. Figure 8 A schematic diagram of the change of hydrogen sulfide concentration under accident conditions provided in the embodiments of the present application, Fig. 9 A schematic diagram of the change of water volume under accident conditions provided in an embodiment of the present application;

[0161] Exhaust air volume 2219m 3 / h, fresh air intake volume 2179m 3 / h, the current structure can reduce the average concentration of hydrogen sulfide from 10ppm to 5ppm in 24.5s; at the same time, when the ambient moisture content is 376ppm and the intake moisture content is 38.8ppm, after 150s (i.e. 2.5min) of exhaust ventilation, the moisture content inside the whole machine is 49.03ppm, which can reach the -48℃ dew point requirement and meet the -45℃ dew point requirement.

[0162] The component volume cloud diagram is displayed in the form of a cross-sectional diagram, and some results are presented in the form of multiple cross-sectional axonometric diagrams. The simulation results are the internal conditions of the model at 150s.

[0163] For the hydrogen sulfide component, the concentration in most areas inside the whole machine is below 5ppm. There is a small amount of hydrogen sulfide accumulation below the door panel at the far end of the exhaust vent, which can be solved by blocking the slit of the door panel in the area. For the moisture component, the content in most areas inside the whole machine is below 100ppm, and the accumulation location is the same as that of hydrogen sulfide.

[0164] There is no obvious partition area inside the whole machine, so the pressure in the area except the negative pressure pipe is almost the same.

[0165] Since the air intake fresh air coefficient is 0.982 (air intake fresh air coefficient = intake air volume ÷ exhaust air volume), the fresh air volume is lower than the exhaust air volume, the entire machine is in a negative pressure state, and the maximum negative pressure value detected is -0.011pa.

[0166] After the process exhaust is turned on for 120 seconds, the hydrogen sulfide concentration in most areas of the whole machine is less than 5mg / m 3 (3.52ppm) is the design requirement; no 3.52ppm concentration area was observed visually.

[0167] When the moisture content of the environment outside the equipment is 376ppm (-30℃ dew point) and the moisture content of the inlet air is 38.8ppm (-50℃ dew point), after 120s of exhaust ventilation, the moisture content inside the whole machine is 83.34ppm, reaching the dew point requirement of -42℃, but not meeting the dew point temperature requirement of -50℃;

[0168] The process exhaust design can meet the requirement of quickly reducing the concentration of hydrogen sulfide inside the machine, with the average concentration from 5mg / m 3(3.52ppm) reduced to 0.295mg / m 3 (0.416ppm);

[0169] Under process exhaust, when the fresh air intake coefficient (fresh air intake coefficient = intake air volume ÷ exhaust air volume) is 0.982, the inside of the whole machine is in a negative pressure state, and the maximum negative pressure value detected is -0.0083pa.

[0170] ① After 150 seconds of emergency exhaust, the hydrogen sulfide concentration in most areas of the whole machine meets the design requirement of less than 5ppm;

[0171] ② When the ambient moisture content is 376ppm (-30℃ dew point) and the intake air moisture content is 38.8ppm (-50℃ dew point), after 150s (2.5min) of exhaust ventilation, the moisture content inside the whole machine is 49.03ppm, reaching the -48℃ dew point requirement and meeting the -45℃ dew point requirement;

[0172] ③ The emergency exhaust design can meet the requirement of quickly reducing the hydrogen sulfide concentration inside the machine, and it takes 24.5 seconds to reduce the average concentration from 10ppm to 5ppm;

[0173] ④ Under accident emergency exhaust, when the air intake fresh air coefficient (air intake fresh air coefficient = air intake volume ÷ exhaust air volume) is 0.982, the inside of the whole machine is in a negative pressure state, and the maximum negative pressure value detected is -0.011pa.

[0174] For example, the production microenvironment device of sulfide all-solid-state batteries provided in the embodiment of the present application adopts the first microenvironment device suitable for the production of sulfide all-solid-state batteries and the enclosed battery box for loading and unloading and the general control logic of the device, which can quickly guide how to control the production and escape of hydrogen sulfide in a production environment containing hydrogen sulfide, and adopts a centralized PLC control cabinet to monitor data and control system operation to reduce the logic redundancy of the microenvironment cover of the whole line. The simulation results verify that this microenvironment device and the general control logic can meet the needs of safe production of sulfide all-solid-state batteries, improve the safety and product quality of battery production, and truly improve product competitiveness.

[0175] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0176] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0177] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0178] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A production microenvironment device for sulfide all-solid-state batteries, characterized in that: It includes an isolation chamber mechanism, a sealing cover mechanism, a vacuum pipeline, a hydrogen sulfide exhaust pipeline and a fresh air component; The isolation chamber mechanism is connected to the sealing cover mechanism, and a production mechanism for a sulfide all-solid-state battery is installed inside the sealing cover mechanism; The vacuum pipeline is matched with the isolation chamber mechanism, wherein the vacuum pipeline is connected to the internal space of the isolation chamber mechanism; The fresh air component includes a sealed cover fresh air mechanism and an isolated chamber fresh air mechanism. The sealed cover fresh air mechanism is connected to the sealed cover mechanism, the isolated chamber fresh air mechanism is connected to the isolated chamber mechanism, and the hydrogen sulfide exhaust pipeline is connected to the internal space of the sealed cover mechanism.

2. The production microenvironment device of sulfide all-solid-state battery according to claim 1, characterized in that: The production microenvironment device also includes a movable door assembly, which includes at least one movable door. The movable door and the sealing cover mechanism are locked and sealed by means of fluororubber sealing pads and sealant, and the hinges of the movable door are sealed by blocking welding.

3. The production microenvironment device of the sulfide all-solid-state battery according to claim 1 or 2, characterized in that: The sealing cover mechanism is provided with an equipment observation window, which is a transparent observation window of antistatic modified corrosion-resistant polycarbonate, and the equipment observation window and the sheet metal of the sealing cover mechanism are sealed by a silicone pad.

4. The production microenvironment device of the sulfide all-solid-state battery according to claim 1, characterized in that: The production micro-environment device also includes a PLC control cabinet, and the sealed cover fresh air mechanism includes a communication mechanism and a variable frequency fan, and the communication mechanism is electrically connected to the variable frequency fan and the PLC control cabinet respectively.

5. The production microenvironment device of the sulfide all-solid-state battery according to claim 4, characterized in that: The sealing cover fresh air mechanism is distributedly arranged on the top of the machine cover of the sealing cover mechanism, and the sealing cover fresh air mechanism is equipped with a check valve.

6. The production microenvironment device of sulfide all-solid-state battery according to claim 1, characterized in that: The pipelines of the vacuum pipeline and the hydrogen sulfide exhaust pipeline are locked and sealed by means of flanges and fluororubber sealing pads, and the interior of the sealing cover mechanism is in a slightly negative pressure state.

7. The production microenvironment device of sulfide all-solid-state battery according to claim 1, characterized in that: The ratio between the gap leakage area and the overall surface area of ​​the production microenvironment device is less than or equal to 0.04%.

8. A control method, characterized in that: The production microenvironment device for a sulfide all-solid-state battery according to any one of claims 1 to 7, wherein the control method comprises: Acquire sensor information of the production microenvironment device, wherein the sensor information includes one or more sensor information of a wind pressure sensor, a hydrogen sulfide sensor, and a dew point temperature sensor; Process the sensor information according to preset control logic to generate control instructions; The sealing cover fresh air mechanism and the isolation chamber fresh air mechanism are controlled according to the control instructions.

9. The control method according to claim 8, characterized in that: The step of controlling the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the control instruction includes: The sealing cover fresh air mechanism and the isolation chamber fresh air mechanism are respectively connected to a PLC control cabinet, and the PLC control cabinet controls the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to preset working conditions and the control instructions.

10. The control method according to claim 9, characterized in that: The preset working conditions include continuous production working conditions, loading and unloading working conditions and accident working conditions. The production microenvironment device of the sulfide all-solid-state battery also includes an accident emergency exhaust fan. The steps of the PLC control cabinet controlling the operation of the sealing cover fresh air mechanism and the isolation chamber fresh air mechanism according to the preset working conditions and the control instructions include: Detecting the current working condition of the production microenvironment device of the sulfide all-solid-state battery; If the current working condition is a continuous production working condition, a first control instruction is generated, and under the first control instruction, the air supply volume of the fresh air mechanism of the sealing cover is less than the exhaust volume of the hydrogen sulfide exhaust pipeline; If the current working condition is a loading and unloading working condition, a second control instruction is generated, and under the second control instruction, the difference between the air supply volume of the fresh air mechanism of the sealing cover and the exhaust volume of the hydrogen sulfide exhaust pipeline is greater than the preset air volume value; If the current operating condition is an accident operating condition, a third control instruction is generated, and the air supply volume of the fresh air mechanism of the sealing cover under the third control instruction is less than the total value of the exhaust volume of the hydrogen sulfide exhaust pipeline and the exhaust volume of the accident emergency exhaust fan.

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