A circulating temperature and pressure increasing system for a warm isostatic press

Abstract

The utility model discloses a kind of circulating temperature rising and pressure increasing systems for warm isostatic press, belong to solid-state battery production technical field.It includes hydraulic station and high pressure cylinder;It further includes circulating solution component, temperature rising solution component and pressure increasing solution component;Temperature rising solution component includes mould temperature controller oil tank and first high-temperature liquid injection pump;Mould temperature controller oil tank is communicated with high pressure cylinder by liquid injection pipeline;First high-temperature liquid injection pump is installed on liquid injection pipeline;Pressure increasing solution component includes heat conducting oil tank, second high-temperature liquid injection pump and bidirectional pressure booster;Hydraulic station is divided into two paths respectively and is communicated to two big cavities of bidirectional pressure booster;Heat conducting oil tank is respectively communicated two small cavities of bidirectional pressure booster by pressure increasing front-end pipeline, and high pressure cylinder is respectively communicated two small cavities of bidirectional pressure booster by pressure increasing rear-end pipeline.The utility model reduces the temperature rising time and pressure increasing time of warm isostatic press, improves the working efficiency of warm isostatic press, so that the temperature uniformity of warm isostatic press is better.

Description

Technical Field

[0001] This utility model belongs to the field of solid-state battery production technology, specifically a cyclic heating and pressurization system for a warm isostatic press, which can improve the working efficiency of the warm isostatic press and enhance the density of solid-state batteries. Background Technology

[0002] Solid-state batteries are considered a core direction for next-generation energy storage technology due to their high energy density, high safety, and long cycle life. However, one of the key challenges facing their industrialization lies in the interfacial contact problem of the battery's multi-layered structure (such as positive and negative electrodes and solid electrolyte layers). Isothermal hydrostatic pressing (SHP) technology applies isotropic pressure to the workpiece through a fluid medium (such as gas or liquid), offering advantages such as uniform pressure, no mold contact damage, and controllable temperature. It has already been successfully applied in fields such as powder metallurgy and ceramic forming. How to efficiently integrate SHP technology with existing battery processes (such as coating and drying) to reduce production costs is a pressing problem that needs to be solved.

[0003] Currently, conventional isostatic presses typically operate at pressures around 300 MPa and maximum temperatures below 85°C. They generally suffer from heating times of approximately four hours, poor temperature uniformity, and significant pressure fluctuations during the holding period. In solid-state battery production, isostatic presses require even higher pressures and temperatures, so these issues affect equipment efficiency and the density of solid-state batteries. Utility Model Content

[0004] In view of this, the present invention discloses a circulating heating and pressurizing system for a warm isostatic press, which reduces the heating and pressurizing time of the warm isostatic press, improves the working efficiency of the warm isostatic press, and makes the temperature uniformity of the warm isostatic press better.

[0005] To achieve the above effects, the specific solution adopted by this utility model is as follows:

[0006] A circulating heating and pressurizing system for a thermostatic press includes a hydraulic station and a high-pressure cylinder; it also includes a circulating solution assembly, a heating solution assembly, and a pressurizing solution assembly.

[0007] The circulating solution assembly includes a transfer tank, an unloading valve, and a high-temperature pump; there are two unloading valves, namely a first unloading valve and a second unloading valve; the high-pressure cylinder is connected to the transfer tank through two unloading pipes; the first unloading valve and the second unloading valve are respectively installed on the corresponding unloading pipes; the high-temperature pump is installed on one of the unloading pipes.

[0008] The heating solution assembly includes a mold temperature control oil tank and a first high-temperature injection pump; the mold temperature control oil tank is connected to the high-pressure cylinder via an injection pipe; the first high-temperature injection pump is installed on the injection pipe.

[0009] The pressurizing solution assembly includes a heat-conducting oil tank, a second high-temperature injection pump, and a bidirectional booster; the hydraulic station branches off into two lines, which are respectively connected to the two large chambers of the bidirectional booster; the heat-conducting oil tank is connected to the two small chambers of the bidirectional booster through the front-end pipeline of the pressurizing assembly, and the high-pressure cylinder is connected to the two small chambers of the bidirectional booster through the rear-end pipeline of the pressurizing assembly.

[0010] The transfer oil tank is connected to the mold temperature controller oil tank via the first return pipe and to the heat transfer oil tank via the second return pipe; both the first and second return pipes are equipped with high-temperature return pumps and solenoid ball valves.

[0011] Furthermore, the booster front-end pipe has one input port and two output ports; the input port of the booster front-end pipe is located in the heat transfer oil tank, and its output ports correspond to the two small chambers of the bidirectional booster.

[0012] Furthermore, the booster back-end pipeline has one output port and two input ports; the output port of the booster front-end pipeline is located in the high-pressure cylinder, and its two input ports correspond to the two small chambers of the bidirectional booster, respectively.

[0013] Furthermore, the second high-temperature injection pump is located on the main line of the pressurization front-end pipeline.

[0014] Furthermore, the outer wall of the high-pressure cylinder is also provided with insulation cotton and an electric heating cable; the electric heating cable is located between the insulation cotton and the high-pressure cylinder.

[0015] Furthermore, it also includes a servo valve and a solenoid directional valve; both the servo valve and the solenoid directional valve have an A port, a B port, a P port, and a T port; wherein the P port and the T port are both connected to the hydraulic station to form a circuit; the A port and the B port are respectively connected to the inlet and outlet ports of the corresponding unloading valve to form a circuit.

[0016] Furthermore, it also includes a control unit. A first level gauge is installed in the mold temperature controller oil tank, and a second level gauge is installed in the heat transfer oil tank. The first level gauge, the second level gauge, the servo valve, and the solenoid directional valve are all electrically connected to the control unit. The first and second level gauges serve as sensors, and the servo valve and the solenoid directional valve serve as actuators, forming an automatic control system with the control unit.

[0017] The beneficial effects of adopting the above-mentioned optimized technical solution are as follows:

[0018] This invention enables faster heating and better temperature uniformity in the operation of a thermostatic press. It ensures the accurate return of the heated and pressurized solutions to their respective oil tanks, reducing the heating and pressurization times and improving the press's efficiency. This also results in better temperature uniformity and guarantees the quality of the pressed products. Furthermore, it increases the press's operating time, thereby enhancing the company's productivity and efficiency. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] In the diagram: 1. Mold temperature controller oil tank; 2. First level gauge; 3. First high-temperature injection pump; 4. Heat transfer oil tank; 5. Second level gauge; 6. Second high-temperature injection pump; 7. Hydraulic station; 8. High-pressure cylinder; 9. Two-way booster; 10. First unloading valve; 11. Second unloading valve; 12. High-temperature pump; 13. Transfer oil tank; 14. Servo valve; 15. Solenoid directional valve; 16. First high-temperature return pump; 17. Second high-temperature return pump; 18. First solenoid ball valve; 19. Second solenoid ball valve; 20. Solenoid valve. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] This embodiment achieves a fast and efficient solid-state battery isostatic press by adding a rapid circulating heating and pressurization system to the isostatic press. The isostatic press includes a high-pressure cylinder, a heating mold temperature controller, and a hydraulic booster substation. An electric heating cable is wrapped around the outside of the high-pressure cylinder, and the outside of the electric heating cable is wrapped with insulation cotton.

[0023] The heating mold temperature controller heats the pre-charged solution to the temperature required for pressing solid-state batteries. The heating time is approximately thirty minutes. The system is equipped with two unloading valves and a high-temperature centrifugal pump. Simultaneously, the electric heating tape on the outside of the high-pressure cylinder heats the solution to the temperature required for the operation of the isostatic press. Once the heating mold temperature controller has completed its heating phase, the heated solution is directly injected into the high-pressure cylinder of the isostatic press. After filling, the unloading valves and the high-temperature centrifugal pump are opened, and the solution is pumped back into the oil tank of the heating mold temperature controller. This rapid preheating of the high-pressure cylinder by the high-temperature solution is achieved. The injection time of the heating mold temperature controller and the pumping time of the high-temperature centrifugal pump are both approximately three minutes. This cycle is repeated several times, and the temperature uniformity is detected by a temperature sensor within the high-pressure cylinder structure. The preheating of the solution by the heating mold temperature controller, the rapid circulation heating within the high-pressure cylinder, and the insulation provided by the electric heating tape together ensure the heating efficiency and temperature uniformity of the isostatic press.

[0024] After the temperature of the isostatic press reaches the specified operating temperature, the pressurization circulation section starts to work. The hydraulic pressurization substation raises the pressure in the high-pressure cylinder to the specified pressure through the bidirectional pressurizer. After the isostatic press has finished holding the pressure, the unloading valve is used to replenish all the solution in the mold temperature controller and the heat transfer oil tank to the oil level before the system circulation through the circulation return pump, thus completing one cycle.

[0025] The following is a more specific example:

[0026] like Figure 1 As shown, this embodiment consists of a circulating solution assembly, a heated solution assembly, and a pressurized solution assembly.

[0027] The circulating solution assembly includes a transfer tank 13, an unloading valve, a high-temperature pump 12, a servo valve, and a solenoid directional valve. Two unloading valves are provided: a first unloading valve and a second unloading valve. The high-pressure cylinder is connected to the transfer tank via two unloading pipes. The first and second unloading valves are installed on their respective unloading pipes, with the first unloading valve installed on the first unloading pipe and the second unloading valve installed on the second unloading pipe. The high-temperature pump is installed on the first unloading pipe and located downstream of the first unloading valve. Both the servo valve and the solenoid directional valve have ports A, B, P, and T. Ports P and T are connected to the hydraulic station to form a circuit. Ports A and B are connected to the inlet and outlet ports of the corresponding unloading valves to form a circuit. The structure and implementation principle of the solenoid valve and the servo valve are common knowledge in the art and will not be elaborated further. The solenoid directional valve corresponds to the second unloading valve.

[0028] The heating solution assembly includes a mold temperature controller oil tank and a first high-temperature injection pump 3; the mold temperature controller oil tank is connected to the high-pressure cylinder via an injection pipe; the first high-temperature injection pump is installed on the injection pipe;

[0029] The pressurized solution assembly includes a heat-conducting oil tank, a second high-temperature injection pump, and a bidirectional booster; the hydraulic station branches off into two lines, which are respectively connected to the two large chambers of the bidirectional booster; the heat-conducting oil tank is connected to the two small chambers of the bidirectional booster through the front-end pipeline of the booster, and the high-pressure cylinder is connected to the two small chambers of the bidirectional booster through the rear-end pipeline of the booster.

[0030] Both the front-end and rear-end pressurization pipelines are branched pipelines. The front-end pressurization pipeline has one input port and two output ports. The input port of the front-end pressurization pipeline is located in the heat transfer oil tank, and its output ports correspond to the two small chambers of the bidirectional pressurizer. The rear-end pressurization pipeline has one output port and two input ports. The output port of the front-end pressurization pipeline is located in the high-pressure cylinder, and its two input ports correspond to the two small chambers of the bidirectional pressurizer. In this embodiment, the second high-temperature injection pump is located on the main line of the front-end pressurization pipeline. The bidirectional pressurizer achieves bidirectional pressurization function through solenoid valve control; it is a directly purchased product from Shanxi Hengli Technology Co., Ltd.

[0031] The specific implementation principle of this embodiment is as follows:

[0032] The circulating heating and pressurization system heats the solution in the mold temperature controller's oil tank 1 to the temperature required for the operation of the isostatic press. Simultaneously, the electric heating cable outside the high-pressure cylinder 8 also heats up to the required operating temperature. The first high-temperature injection pump 3 injects the heated solution into the high-pressure cylinder 8 for preheating. During oil return, the first unloading valve 10 and the second unloading valve 11 are controlled by the hydraulic station 7 through the opening and closing of the servo valve 14 and the solenoid directional valve. When the first unloading valve 10 is open, the high-temperature pump 12 draws the solution from the high-pressure cylinder into the transfer oil tank 13. A ring of temperature strain gauges on the high-pressure cylinder 8 is used to detect the actual temperature and temperature uniformity of the entire cylinder. Before the high-pressure cylinder temperature reaches the required operating temperature of the isostatic press, the high-temperature solution is circulated again between the mold temperature controller and the high-pressure cylinder 8 to quickly bring the internal temperature of the high-pressure cylinder to the required operating temperature and ensure temperature uniformity.

[0033] After the isothermal isostatic press has completed its preheating cycle, the heating solution in the mold temperature controller's oil tank 1 fills the high-pressure cylinder 8 through the first high-temperature injection pump 3. At this point, the isothermal isostatic press begins to pressurize. During pressurization, the hydraulic station 7 injects hydraulic oil into the large chamber of the bidirectional intensifier 9, and the injection pump 6 injects heat transfer oil from the heat transfer oil tank 4 into the small chamber of the bidirectional intensifier 9. The bidirectional intensifier 9 compresses the heat transfer oil into the high-pressure cylinder 8 for pressurization. The hydraulic station 7, injection pump 6, and bidirectional intensifier 9 work in a cycle to raise the pressure in the high-pressure cylinder to the actual working pressure required by the isothermal isostatic press, and pressure holding begins.

[0034] After the high-pressure cylinder 8 finishes holding pressure, the hydraulic station 7 opens the first unloading valve 10 through the control servo valve 14 to start unloading pressure. All the solution in the high-pressure cylinder 8 is pumped back to the transfer oil tank 13 through the high-temperature pumping pump 12. According to the difference in liquid level signals between the first liquid level gauge 2 in the mold temperature controller oil tank 1 and the second liquid level gauge 5 in the heat transfer oil tank 4, the control unit opens the solenoid ball valve 18 and the solenoid ball valve 19 in turn. The solution in the transfer oil tank 13 is then pumped back to the mold temperature controller oil tank 1 and the heat transfer oil tank 4 through the high-temperature return pump 16 and the high-temperature return pump 17, respectively, according to the liquid level signals. This completes the operation of the entire isostatic press.

[0035] Specifically, the high-pressure cylinder feeds back temperature signals and liquid level signals from the level gauge to the control unit via its own structural temperature strain gauges. The control unit then rapidly heats the cylinder by circulating the high-temperature solution through the mold temperature controller and the high-pressure cylinder, enabling it to quickly reach the required operating temperature and pressure. The heating time of the mold temperature controller is approximately thirty minutes, while the operation time of the liquid injection and extraction centrifugal pumps is less than three minutes. By reducing the heating time at the source and using a rapid circulation heating system, the heating efficiency, pressure increase efficiency, and temperature uniformity of the isostatic press are ensured, thereby improving the working efficiency of the isostatic press and increasing the equipment's operating time.

Claims

1. A circulating heating and pressurization system for a thermostatic press, comprising a hydraulic station (7) and a high-pressure cylinder (8); characterized in that, It also includes a circulating solution assembly, a heated solution assembly, and a pressurized solution assembly; The circulating solution assembly includes a transfer tank (13), an unloading valve, and a high-temperature pump (12); there are two unloading valves, namely a first unloading valve and a second unloading valve; the high-pressure cylinder is connected to the transfer tank through two unloading pipes; the first unloading valve and the second unloading valve are respectively installed on the corresponding unloading pipes; the high-temperature pump is installed on one of the unloading pipes. The heating solution assembly includes a mold temperature control oil tank (1) and a first high-temperature injection pump (3); the mold temperature control oil tank is connected to the high-pressure cylinder through an injection pipe; the first high-temperature injection pump is installed on the injection pipe; The pressurized solution assembly includes a heat-conducting oil tank (4), a second high-temperature injection pump (6), and a bidirectional booster; the hydraulic station is divided into two paths that are respectively connected to the two large chambers of the bidirectional booster; the heat-conducting oil tank is respectively connected to the two small chambers of the bidirectional booster through the front-end pipeline of the pressurization, and the high-pressure cylinder is respectively connected to the two small chambers of the bidirectional booster through the rear-end pipeline of the pressurization; The transfer oil tank is connected to the mold temperature controller oil tank via the first return pipe and to the heat transfer oil tank via the second return pipe; both the first and second return pipes are equipped with high-temperature return pumps and solenoid ball valves.

2. The circulating heating and pressurization system for a thermostatic press according to claim 1, characterized in that, The booster front-end pipeline has one input port and two output ports; the input port of the booster front-end pipeline is located in the heat transfer oil tank, and its output ports correspond to the two small chambers of the bidirectional booster.

3. The circulating heating and pressurization system for a thermostatic press according to claim 1, characterized in that, The booster back-end pipeline has one output port and two input ports; the output port of the booster front-end pipeline is located in the high-pressure cylinder, and its two input ports correspond to the two small chambers of the bidirectional booster.

4. A cyclic heating and pressurization system for a thermostatic press according to claim 1, characterized in that, The second high-temperature injection pump is located on the main pipeline at the front end of the pressurization stage.

5. A cyclic heating and pressurization system for a thermostatic press according to claim 1, characterized in that, The outer wall of the high-pressure cylinder (8) is also provided with insulation cotton and electric heating cable; the electric heating cable is located between the insulation cotton and the high-pressure cylinder.

6. A cyclic heating and pressurization system for a thermostatic press according to claim 1, characterized in that, It also includes a servo valve and a solenoid directional valve; both the servo valve and the solenoid directional valve have an A port, a B port, a P port and a T port; the P port and the T port are both connected to the hydraulic station to form a circuit; the A port and the B port are respectively connected to the inlet and outlet ports of the corresponding unloading valve to form a circuit.

7. A cyclic heating and pressurization system for a thermostatic press according to claim 6, characterized in that, It also includes a control unit. A first level gauge is installed in the oil tank (1) of the mold temperature controller, and a second level gauge is installed in the heat transfer oil tank. The first level gauge, the second level gauge, the servo valve and the solenoid directional valve are all electrically connected to the control unit. The first level gauge and the second level gauge are used as sensors, and the servo valve and the solenoid directional valve are used as actuators. Together with the control unit, they form an automatic control system.

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