A warm isostatic pressing device for all-solid-state batteries

Abstract

The utility model discloses a kind of warm isostatic pressing devices for all-solid-state battery, including pressure cavity and the main pressurizing device located above pressure cavity;Fixedly installed on the outer wall of pressure cavity outer frame;Gas recovery system and double valve protection system are installed on outer frame, and double valve protection system is integrated on the cavity pressure relief interface of pressure cavity through flange, the gas inlet end of gas recovery system is connected with the outlet of double valve protection system through pipeline;The warm isostatic pressing device for all-solid-state battery of the utility model is synergized by the gas recovery system and double valve protection system of additional, cooling, impurity removal, purification and compression recovery can be carried out to the protection gas discharged by pressure relief, then it is retransported to pressure cavity reuse by gas booster pump, greatly reduce protection gas consumption, reduce the gas cost of all-solid-state battery processing;While the protection gas after purification can avoid impurity to affect battery pole piece quality.

Description

Technical Field

[0001] This utility model belongs to the field of solid-state battery temperature isostatic pressing technology, specifically relating to a temperature isostatic pressing device for all-solid-state batteries. Background Technology

[0002] In all-solid-state batteries, the electrodes and solid electrolytes are in solid-solid interface contact, which is prone to porosity and poor contact, resulting in high interface resistance and low ion transport efficiency. Temperature isostatic pressing (WIP) technology is a key process in the manufacturing of all-solid-state batteries, especially in the core link of mass production of high-energy-density sulfide solid-state batteries. The WIP process is usually carried out in a medium-temperature (about 70-250 degrees Celsius) and ultra-high-pressure environment. High thermal conductivity liquid oil materials (mineral oil, silicone oil, and hydraulic oil, etc.) are used as the main transfer medium, while high-purity argon (or nitrogen) is used to maintain an inert protective atmosphere in the cavity to prevent the solid electrolyte material and electrode active material (such as lithium foil) from oxidizing and deteriorating at high temperatures.

[0003] Existing technology and equipment have significant shortcomings in the production process: after each pressing, the chamber pressure needs to be released to remove the workpiece. The mixture of protective gas and a small amount of oil mist volatiles is directly discharged through the pressure relief valve, which not only causes a huge waste of expensive protective gas and significantly increases production costs, but also poses a safety risk due to the failure of a single pressure relief valve. In addition, if the discharged gas contains sulfide electrolyte dust or decomposition volatiles (such as hydrogen sulfide), direct discharge will also bring environmental hazards. In terms of gas quality, if fresh gas is repeatedly added, trace amounts of oxygen or moisture impurities in the fresh gas may contaminate the solid electrolyte interface, which is extremely sensitive to the atmosphere, affecting the final electrochemical performance of the battery and product consistency. Therefore, this utility model proposes a thermostatic pressure device for all-solid-state batteries. Utility Model Content

[0004] The purpose of this invention is to provide a thermostatic isobaric device for all-solid-state batteries to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a thermostatic pressure device for all-solid-state batteries, comprising... Pressure chamber and main pressurization device located above the pressure chamber; An external frame that is fixedly installed on the outer wall of the pressure chamber; A gas recovery system and a dual-valve protection system are installed on the external frame. The dual-valve protection system is integrated with the pressure chamber's pressure relief port via a flange. The gas inlet of the gas recovery system is connected to the outlet of the dual-valve protection system via a pipe, and the gas outlet of the gas recovery system is connected to the pressure port of the pressure chamber via a pipe.

[0006] Preferably, the dual-valve protection system includes, in sequence along the pressure path, a flange module, a main valve unit, a pressure monitoring section, and a backup valve unit.

[0007] Preferably, the pressure monitoring section integrates a pressure transmitter and a trace oxygen water sensor, and the front surface of the pressure monitoring section is also provided with an observation window.

[0008] Preferably, the flange module adopts a tongue and groove sealing structure, and a metal filter element is integrated on its inner side.

[0009] Preferably, the main valve unit is a pneumatic shut-off valve, and the standby valve unit is a solenoid ball valve.

[0010] Preferably, the gas recovery system includes a plate-fin cooler, a cyclone separator, a dryer filter, an oil-free compressor, a protective gas storage tank, and a gas booster pump connected in sequence via pipelines. The inlet of the gas booster pump is connected to the outlet of the protective gas storage tank, and the outlet of the gas booster pump is connected to the pressurization port of the pressure chamber.

[0011] Preferably, the external frame includes an arc-shaped fixing plate fixed to the outer wall of the pressure chamber and a platform plate welded to the surface of the arc-shaped fixing plate for installation of the gas recovery system and the dual-valve protection system. A fixing structure and a positioning structure are provided between the arc-shaped fixing plate and the pressure chamber.

[0012] Preferably, the fixing structure includes a support column welded to the outer wall of the pressure chamber, a support hole through which the support column passes through the bottom surface of the arc-shaped fixing plate, a fixing bolt disposed on the bottom surface of the arc-shaped fixing plate, and a threaded hole on the surface of the support column for the threaded end of the fixing bolt to be screwed in. The positioning structure includes a positioning block welded to the outer wall of the pressure chamber and located above the support column. The inner wall of the arc-shaped fixing plate is provided with a positioning groove for the positioning block to be embedded.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The thermostatic pressure device for all-solid-state batteries of this utility model, through the synergistic effect of the added gas recovery system and the dual-valve protection system, can cool, remove impurities, purify and compress the protective gas discharged after depressurization, and then send it back to the pressure chamber for reuse via a gas booster pump, which greatly reduces the consumption of protective gas and lowers the gas cost of all-solid-state battery processing; at the same time, the purified protective gas can avoid impurities from affecting the quality of the battery electrode sheets, and with the stable pressurization of the pressure chamber and the main pressurizing device, it ensures the consistency of the battery pressing process and improves the product qualification rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the pressure chamber of this utility model; Figure 3This is a schematic diagram of the gas recovery system and dual-valve protection system of this utility model; Figure 4 This is a schematic diagram of the pressure monitoring section of this utility model; Figure 5 This is a schematic diagram of the internal structure of the flange module of this utility model; Figure 6 This is a structural block diagram of the dual-valve protection system of this utility model; Figure 7 This is a structural block diagram of the gas recovery system of this utility model; Figure 8 This is a cross-sectional view of the connection between the external frame and the pressure chamber of this utility model; In the diagram: 1. Pressure chamber; 11. Positioning block; 12. Main pressurization device; 13. External frame; 131. Arc-shaped fixing plate; 132. Platform plate; 133. Support hole; 134. Fixing bolt; 135. Positioning groove; 14. Support column; 141. Threaded hole; 2. Gas recovery system; 3. Dual valve protection system; 31. Flange module; 32. Main valve unit; 33. Pressure monitoring section; 34. Backup valve unit; 331. Pressure transmitter; 332. Micro oxygen water sensor; 333. Observation window; 311. Metal filter element; 21. Plate-fin cooler; 22. Cyclone separator; 23. Dryer filter; 24. Oil-free compressor; 25. Protective gas storage tank; 26. Gas booster pump. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 Please see Figures 1 to 7 This is the first embodiment of the present invention, which provides the following technical solution: a thermostatic pressure device for all-solid-state batteries, comprising... Pressure chamber 1 and main pressurization device 12 located above pressure chamber 1; An external frame 13 is fixedly installed on the outer wall of the pressure chamber 1; Gas recovery system 2 and dual valve protection system 3 are installed on the external frame 13. The dual valve protection system 3 is integrated with the cavity pressure relief interface of the pressure chamber 1 through a flange. The gas inlet of the gas recovery system 2 is connected to the outlet of the dual valve protection system 3 through a pipe, and the gas outlet of the gas recovery system 2 is connected to the pressurization port of the pressure chamber 1 through a pipe. The isostatic pressure device for all-solid-state batteries uses an external frame 13 fixedly installed on the outer wall of the pressure chamber 1, which provides stable support for the gas recovery system 2 and the dual-valve protection system 3. During operation, the main pressurizing device 12 located at the upper end of the pressure chamber 1 applies pressure to the inside of the pressure chamber 1 to meet the processing requirements of the all-solid-state battery module. This process uses high thermal conductivity mineral oil as the main pressure transmission medium to achieve uniform and efficient pressure transmission. At the same time, a protective gas (argon or nitrogen) is introduced as a protective atmosphere to prevent the battery materials from oxidizing under high temperature and high pressure. Meanwhile, the dual-valve protection system 3 is integrated into the cavity pressure relief port of the pressure chamber 1 through a flange to control the pressure relief process of the pressure chamber 1. The gas inlet of the gas recovery system 2 is connected to the outlet of the dual-valve protection system 3 through a pipeline to collect the gas discharged by the dual-valve protection system 3. The gas outlet of the gas recovery system 2 is then connected to the pressurization port of the pressure chamber 1 through a pipeline to re-transport the recovered gas back into the pressure chamber 1, realizing the recycling of gas and ensuring the coordinated operation of the overall pressurization and gas recovery of the equipment.

[0017] In this embodiment, preferably, the dual-valve protection system 3 includes a flange module 31, a main valve unit 32, a pressure monitoring section 33, and a backup valve unit 34 along the pressure path. The dual-valve protection system 3 is arranged in sequence according to the pressure transmission path. When the pressure chamber 1 needs to be depressurized, the pressurized gas first enters the dual-valve protection system 3 through the flange module 31, and then flows through the main valve unit 32. The main valve unit 32 mainly undertakes the conventional pressure relief control function. Then the pressurized gas enters the pressure monitoring section 33 to monitor the pressure parameters during the pressure relief process. Finally, the pressurized gas is discharged through the backup valve unit 34. The backup valve unit 34 can take over the pressure relief control when the main valve unit 32 fails. Through this sequential arrangement, the stability and reliability of the pressure relief process of the pressure chamber 1 are ensured.

[0018] In this embodiment, preferably, the pressure monitoring section 33 integrates a pressure transmitter 331 and a trace oxygen / water sensor 332, and the front surface of the pressure monitoring section 33 is also provided with an observation window 333. The pressure transmitter 331 integrated on the pressure monitoring section 33 can detect the pressure value of the pressurized gas in the pressure monitoring section 33 in real time; the trace oxygen / water sensor 332 can detect the content of trace oxygen and water in the pressurized gas, preventing oxygen and water in the gas from adversely affecting the processing quality of equipment components or all-solid-state batteries; at the same time, the observation window 333 made of transparent glass has good high temperature resistance and pressure resistance, and the staff can directly observe the state inside the pressure monitoring section 33 through the observation window 333. The three work together to achieve comprehensive monitoring of the pressure, gas composition and internal state inside the pressure monitoring section 33.

[0019] In this embodiment, preferably, the flange module 31 adopts a tenon and groove sealing structure. This structure, through the precise fit between the tenon and the groove, can effectively enhance the sealing performance of the connection between the flange module 31 and the pressure chamber 1, preventing the pressurized gas from leaking from the connection gap during the pressure release process. In addition, the metal filter element 311 integrated inside the flange module 31 can filter the pressurized gas entering the dual valve protection system 3, intercepting solid impurities or particles that may be contained in the gas, preventing impurities from entering the subsequent main valve unit 32, pressure monitoring section 33 and backup valve unit 34, preventing component blockage or wear, and ensuring the normal operation of the dual valve protection system 3.

[0020] In this embodiment, preferably, the main valve unit 32 is a pneumatic shut-off valve with a valve disc using a composite seal of hard alloy and PTFE. It achieves valve opening and closing through pneumatic control, enabling rapid response to pressure relief control requirements. The hard alloy possesses high hardness and wear resistance, while PTFE offers excellent sealing performance and corrosion resistance. This combination ensures that the main valve unit 32 maintains good sealing performance and resists erosion from pressurized gas during long-term use. The standby valve unit 34 is a solenoid ball valve with a valve disc using a double seal of PTFE and copper alloy. It achieves valve action through electromagnetic control, resulting in a fast response. The PTFE ensures reliable sealing, while the copper alloy enhances the structural strength and corrosion resistance of the valve disc. The different structural designs and sealing methods of the main valve unit 32 and the standby valve unit 34 ensure reliable pressure relief control of the dual-valve protection system 3 under various operating conditions.

[0021] In this embodiment, preferably, the gas recovery system 2 includes a plate-fin cooler 21, a cyclone separator 22, a dryer filter 23, an oil-free compressor 24, a protective gas storage tank 25, and a gas booster pump 26 connected in sequence via pipelines. The inlet of the gas booster pump 26 is connected to the outlet of the protective gas storage tank 25, and the outlet of the gas booster pump 26 is connected to the pressurization port of the pressure chamber 1. The components of the gas recovery system 2 are connected in sequence via pipelines. When the gas discharged from the dual-valve protection system 3 enters the gas recovery system 2, it first flows through the plate-fin cooler 21. The plate-fin cooler 21 uses its efficient heat exchange structure to cool the gas and reduce its temperature. The cooled gas then enters the cyclone separator 22, which centrifuges... The gas is separated by force to remove larger particles of impurities. The gas then enters a dryer filter 23, which further filters out finer impurities and oil mist to ensure gas purity. The purified gas enters an oil-free compressor 24, which compresses the gas to a certain pressure. The compressed gas is then transported to a protective gas storage tank 25 for storage to ensure a stable supply. When the pressure chamber 1 needs pressurization, the gas in the protective gas storage tank 25 enters a gas booster pump 26, which further increases the gas pressure to the required level for the pressure chamber 1. The gas is then transported to the pressurization port of the pressure chamber 1, thus realizing the recovery, purification, compression, storage, and reuse of the gas.

[0022] In summary, before use, a protective gas (argon or nitrogen) is first filled into the pressure chamber 1 containing the all-solid-state battery module housing as a protective atmosphere: the protective gas (argon or nitrogen) is output from the protective gas storage tank 25, pressurized to the set pressure by the gas booster pump 26, and then injected through the protective gas inlet at the top of the pressure chamber 1 to gradually expel the air in the chamber; after the air in the chamber is completely expelled, filled with protective gas (argon or nitrogen), and the pressure is stable, the main pressurizing device 12 located at the top of the pressure chamber 1 is started. This device drives hydraulic oil (high thermal conductivity mineral oil) as the main pressure transmission medium to uniformly transmit pressure to the surface of the electrode sheet, achieving isostatic pressing. During the entire pressing process, the main pressurizing device 12 continuously maintains the set pressure, and the protective gas (argon or nitrogen) atmosphere effectively prevents the electrode sheet from oxidizing under high temperature and high pressure, ensuring the pressing quality.

[0023] After compression is completed, pressure relief begins: the dual-valve protection system 3 is activated, and the pressurized gas first passes through the flange module 31, where the inner metal filter element 311 filters impurities from the gas, and then enters the pressure monitoring section 33 through the main valve unit 32; the pressure transmitter 331 monitors the pressure in real time, and the trace oxygen water sensor 332 detects the gas composition. The staff can check whether there are any significant abnormalities in the pressure monitoring section 33 through the transparent observation window 333; if the main valve unit 32 fails, the backup valve unit 34 will be activated immediately to take over the pressure relief.

[0024] The gas discharged from the pressure relief system enters the gas recovery system 2 simultaneously: it is first cooled by the plate-fin cooler 21, then enters the cyclone separator 22 to separate large particles of impurities, and then passes through the dryer filter 23 to filter out fine impurities and oil mist; the purified gas is compressed by the oil-free compressor 24 and finally returned to the protective gas storage tank 25 for storage, to be recycled for the next use. The dual-valve protection system 3 ensures the safety of pressure relief throughout the process, and the gas recovery system 2 realizes the circulation of protective gas.

[0025] Example 2 Please see Figures 1 to 8 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the outer frame 13 includes an arc-shaped fixing plate 131 fixed to the outer wall of the pressure chamber 1 and a platform plate 132 welded to the surface of the arc-shaped fixing plate 131 for the gas recovery system 2 and the dual valve protection system 3 to be installed. A fixing structure and a positioning structure are provided between the arc-shaped fixing plate 131 and the pressure chamber 1, which can improve the installation convenience and stability of the outer frame 13, and at the same time facilitate subsequent disassembly and maintenance.

[0026] In this embodiment, preferably, the fixing structure includes a support column 14 welded to the outer wall of the pressure chamber 1, a support hole 133 through which the support column 14 passes through the bottom surface of the arc-shaped fixing plate 131, a fixing bolt 134 disposed on the bottom surface of the arc-shaped fixing plate 131, and a threaded hole 141 on the surface of the support column 14 for the threaded end of the fixing bolt 134 to be screwed in. The positioning structure includes a positioning block 11 welded to the outer wall of the pressure chamber 1 and located above the support column 14. The inner wall of the arc-shaped fixing plate 131 has a positioning groove 135 for the positioning block 11 to be embedded. When the arc-shaped fixing plate 131 is aligned with the outer wall of the pressure chamber 1, the positioning structure is positioned by the positioning block 11. When the pressure chamber 1 is fixedly installed, first attach the arc-shaped fixing plate 131 to the outer wall of the pressure chamber 1, so that the positioning block 11 is embedded in the positioning groove 135, and the end of the support column 14 passes through the support hole 133 to the surface of the arc-shaped fixing plate 131, ensuring that the arc-shaped fixing plate 131 is in contact with the outer wall of the pressure chamber 1. At this time, screw the fixing bolt 134 into the bottom of the arc-shaped fixing plate 131, so that the threaded end of the fixing bolt 134 is screwed into the fixing bolt 134 and tightened, thus completing the stable fixing of the arc-shaped fixing plate 131 and the pressure chamber 1, thereby realizing the stable installation of the outer frame 13.

[0027] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermostatic isobaric device for all-solid-state batteries, characterized in that: include Pressure chamber (1) and main pressurization device (12) located above pressure chamber (1); An external frame (13) is fixedly installed on the outer wall of the pressure chamber (1); A gas recovery system (2) and a dual-valve protection system (3) are installed on the external frame (13), and the dual-valve protection system (3) is integrated with the cavity pressure relief interface of the pressure chamber (1) through a flange. The gas inlet of the gas recovery system (2) is connected to the outlet of the dual-valve protection system (3) through a pipe, and the gas outlet of the gas recovery system (2) is connected to the pressurization port of the pressure chamber (1) through a pipe. The external frame (13) includes an arc-shaped fixing plate (131) fixed to the outer wall of the pressure chamber (1) and a platform plate (132) welded to the surface of the arc-shaped fixing plate (131) for the gas recovery system (2) and the dual valve protection system (3) to be installed. A fixing structure and a positioning structure are provided between the arc-shaped fixing plate (131) and the pressure chamber (1).

2. The isostatic pressing device for all-solid-state batteries according to claim 1, characterized in that: The dual-valve protection system (3) includes, along the pressure path, a flange module (31), a main valve unit (32), a pressure monitoring section (33), and a backup valve unit (34).

3. The isostatic pressing device for all-solid-state batteries according to claim 2, characterized in that: The pressure monitoring section (33) integrates a pressure transmitter (331) and a trace oxygen water sensor (332), and the front surface of the pressure monitoring section (33) is also provided with an observation window (333).

4. The isostatic pressing device for all-solid-state batteries according to claim 2, characterized in that: The flange module (31) adopts a tenon and groove sealing structure, and a metal filter element (311) is integrated inside it.

5. The isostatic pressing device for all-solid-state batteries according to claim 2, characterized in that: The main valve unit (32) is a pneumatic shut-off valve, and the standby valve unit (34) is a solenoid ball valve.

6. The isostatic pressing device for all-solid-state batteries according to claim 1, characterized in that: The gas recovery system (2) includes a plate-fin cooler (21), a cyclone separator (22), a dryer filter (23), an oil-free compressor (24), a protective gas storage tank (25), and a gas booster pump (26) connected in sequence by pipelines. The inlet of the gas booster pump (26) is connected to the outlet of the protective gas storage tank (25), and the outlet of the gas booster pump (26) is connected to the pressurization port of the pressure chamber (1).

7. The isostatic pressing device for all-solid-state batteries according to claim 1, characterized in that: The fixed structure includes a support column (14) welded to the outer wall of the pressure chamber (1), a support hole (133) through which the support column (14) passes through the bottom surface of the arc-shaped fixed plate (131), a fixing bolt (134) set on the bottom surface of the arc-shaped fixed plate (131), and a threaded hole (141) on the surface of the support column (14) for the threaded end of the fixing bolt (134) to be screwed in.

8. The isostatic pressing device for all-solid-state batteries according to claim 7, characterized in that: The positioning structure includes a positioning block (11) welded to the outer wall of the pressure chamber (1) and located above the support column (14), and the inner wall of the arc-shaped fixing plate (131) is provided with a positioning groove (135) for the positioning block (11) to be embedded.

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