Warm isostatic pressing machine for solid-state battery

Abstract

The utility model relates to the technical field of warm isostatic pressing equipment, in particular to a warm isostatic pressing machine for a solid-state battery, which comprises a pressurizing structure and a temperature control structure arranged on the pressurizing structure, and the temperature control structure comprises a container assembly and a temperature control assembly arranged on the container assembly; the container assembly comprises a container body, the container body is provided with a heat conduction layer and a heat preservation layer, a spiral piece is arranged between the heat conduction layer and the heat preservation layer, the spiral piece is arranged in the height direction of the container body in a wrapping mode, and an annular cavity is formed by the spiral piece. The temperature control assembly comprises a circulating pipeline laid and extending along the annular cavity, a heating box connected to the circulating pipeline and a circulating pump. After the heating box heats the heat-conducting medium, the heat-conducting medium circulates between the annular cavity and the heating box through the circulating pipeline by utilizing the circulating pump, so that heat can be uniformly conducted to each part of the container main body to provide stable and uniform heat for the parts, and the temperature control stability and efficiency of the warm isostatic pressing machine are effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of warm isostatic pressing equipment, and particularly relates to a warm isostatic pressing machine for solid-state batteries. BACKGROUND

[0002] In the production process of the all-solid-state battery, the warm isostatic pressing machine has great commercial potential for the controllable densification processing technology of the cell laminates and the solid-state electrolyte film. The warm isostatic pressing machine is a typical incremental equipment, which operates at a certain temperature and uniform ultrahigh pressure, can reduce the pores in the solid-state electrolyte film and the electrode, thereby reducing the grain boundary resistance, increasing the concentration of the charge carriers, improving the electrical conductivity, improving the energy density, reducing the volume change during the operation of the solid-state battery, and effectively avoiding the delamination and cracking problems of the solid-state battery.

[0003] The conventional warm isostatic pressing machine controls the temperature by using electric heating. Although the electric heating has a fast heating speed, the temperature distribution is not uniform enough, and local high-temperature or low-temperature areas are easily generated in the equipment. For the solid-state battery production process which has extremely high requirements for temperature uniformity, the battery is prone to have inconsistent defects. Meanwhile, in the long-term working process, the temperature fluctuation of the electric heating method is large, and it is difficult to accurately maintain in the specific temperature range required by the solid-state battery production, which seriously affects the production quality and yield of the solid-state battery. It can be seen that the conventional warm isostatic pressing machine has poor performance in temperature control stability. CONTENT OF THE INVENTION

[0004] The application aims to provide a warm isostatic pressing machine for solid-state batteries, which aims to improve the temperature control stability and efficiency of the warm isostatic pressing machine, and optimize the warm isostatic pressing machine for the solid-state battery process.

[0005] The application provides a warm isostatic pressing machine for solid-state batteries, which comprises a pressing structure, and further comprises a temperature control structure arranged on the pressing structure. The temperature control structure comprises a container assembly and a temperature control assembly arranged on the container assembly. The container assembly comprises a container main body, and the container main body has a heat conduction layer and a heat preservation layer. A spiral member is arranged between the heat conduction layer and the heat preservation layer, and the spiral member is arranged in a wrapping manner along the height direction of the container main body, and forms an annular cavity. The temperature control assembly comprises a circulating pipeline arranged in a wrapping manner along the annular cavity, a heating box connected to the circulating pipeline, and a circulating pump.

[0006] Further, the heat conduction layer is located on one side of the spiral member close to the container main body, and a plurality of steel wire ropes are arranged in a wrapping manner in the heat conduction layer. The heat preservation layer is located on one side of the spiral member away from the container main body.

[0007] Further, the temperature control structure further comprises a sensing assembly, the sensing assembly comprising a temperature sensor and a pressure sensor arranged in the container body.

[0008] Further, the temperature control structure further comprises a temperature control assembly, the temperature control assembly comprising a heating tank, a liquid inlet pipe connected to the heating tank, and a circulating pump; the container body is provided with a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid inlet pipe, and the liquid outlet is connected to the heating tank.

[0009] Further, the inner wall of the heating tank is covered with a polyurethane layer.

[0010] Further, the temperature control assembly comprises a base arranged below the container body, and the heating tank is arranged on the side of the base away from the container body; a control valve is arranged at the connection between the liquid outlet and the heating tank.

[0011] Further, the pressurizing structure comprises a support frame, the container assembly is arranged in the support frame, the support frame is provided with a pressing cover facing the container assembly and a transmission assembly for driving the pressing cover.

[0012] Further, the pressurizing structure further comprises a slide rail arranged below the support frame, and the support frame is arranged on the slide rail and can reciprocate along the slide rail.

[0013] The beneficial effects of the present application are as follows:

[0014] 1. The warm isostatic press for solid-state batteries of the present application, by arranging a temperature control assembly in the container assembly, when the warm isostatic press is running, the heating tank is filled with a heat-conducting medium such as heat-conducting oil, after the heating tank heats the heat-conducting medium, the heat-conducting medium is circulated between the annular cavity and the heating tank through the circulating pipe by the circulating pump, and then the heat is transferred to the liquid medium and the loaded sample in the pressure container, the annular cavity is arranged along the height direction of the container body, so that the heat can be uniformly conducted to each part of the container body to provide stable and uniform heat, effectively improving the temperature control stability and efficiency of the warm isostatic press, and ensuring the production quality and yield of the solid-state batteries.

[0015] 2. The warm isostatic press for solid-state batteries sets a heat preservation box in communication with the container body, after processing, the liquid medium in the container body can be recycled and stored by the heat preservation box, when processing is needed, the stored liquid medium is pumped back to the container body through the infusion tube by the infusion pump for recycling, on the one hand, the heat preservation box is used for heat preservation of the liquid medium, and the liquid medium does not need to be heated repeatedly when used again, especially when the warm isostatic press is frequently started, the energy consumption of the warm isostatic press can be effectively reduced; on the other hand, the liquid medium is provided with a temporary storage container, and the waste phenomenon caused by direct discharge of the liquid medium after use is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a warm isostatic press for solid-state batteries provided by an embodiment of the present application;

[0017] Figure 2 is another structural schematic diagram of a warm isostatic press for solid-state batteries provided by an embodiment of the present application;

[0018] Figure 3 is a structural schematic diagram of a temperature control structure in the embodiment of the present application;

[0019] Figure 4 is a cross-sectional schematic diagram of the temperature control structure in the embodiment of the present application;

[0020] Figure 5 is Figure 3 is a local enlarged schematic diagram of part A.

[0021] BRIEF DESCRIPTION OF DRAWINGS:

[0022] 1, pressurizing structure; 11, support frame; 12, gland; 13, transmission assembly; 14, sliding rail; 2, temperature control structure; 21, container assembly; 211, container body; 2111, liquid inlet; 2112, liquid outlet; 212, heat conduction layer; 2121, steel wire rope; 213, heat preservation layer; 214, spiral part; 215, annular cavity; 22, temperature control assembly; 221, circulating pipeline; 222, heating box; 223, circulating pump; 23, sensing assembly; 231, temperature sensor; 232, pressure sensor; 24, heat preservation assembly; 241, heat preservation box; 242, infusion tube; 243, infusion pump; 244, base. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0024] It should be noted that although the functional modules are divided in the device schematic diagram, the logical order is shown in the flowchart, but in some cases, the steps shown or described can be performed in a manner different from the module division in the device, or the order in the flowchart. The terms "first", "second", etc. in the specification and claims and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification is for the purpose of describing the embodiments of the present application only and is not intended to limit the present application.

[0026] Referring to Figure 1 and Figure 2 , the present application provides a warm isostatic press for solid-state batteries, comprising a pressurizing structure 1, and further comprising a temperature control structure 2 arranged in the pressurizing structure 1. When the warm isostatic press is running, the pressurizing structure 1 is used to cooperate with the sealing of the temperature control structure 2 and to apply ultra-high pressure to the temperature control structure 2, and the temperature control structure 2 is used to accommodate the mold and adjust the temperature to a specified value.

[0027] Specifically, the pressurizing structure 1 comprises a support frame 11, the temperature control structure 2 is arranged in the support frame 11, a gland 12 is movably connected to the inner surface of the upper end of the support frame 11, the gland 12 faces the temperature control structure 2, one side of the support frame 11 is provided with a transmission assembly 13 for driving the gland 12, the transmission assembly 13 drives the gland 12 to move in the vertical direction in a hydraulic transmission manner to cooperate with the sealing of the temperature control structure 2, and one side of the temperature control structure 2 is provided with a control assembly for monitoring and controlling each structure. In addition, the pressurizing structure 1 further comprises a slide rail 14 arranged below the support frame 11, the support frame 11 is arranged on the slide rail 14 and can reciprocate along the slide rail 14, and the support frame 11 can move relative to the temperature control structure 2 through the slide rail 14. When the support frame 11 moves to the front side or the rear side of the temperature control structure 2, it is convenient to clean and maintain the inside of the temperature control structure 2.

[0028] Referring to Figure 3 , Figure 4 and Figure 5The temperature control structure 2 comprises a container assembly 21 and a temperature control assembly 22 arranged on the container assembly 21, the container assembly 21 is arranged in the support frame 11, and the container assembly 21 comprises a container body 211, the container body 211 has a heat conduction layer 212 and a heat preservation layer 213, a spiral member 214 is arranged between the heat conduction layer 212 and the heat preservation layer 213, the spiral member 214 is arranged in a wrapping manner along the height direction of the container body 211, and the spiral member 214 forms an annular cavity 215; the temperature control assembly 22 comprises a circulating pipeline 221 arranged in the annular cavity 215, a heating box 222 connected to the circulating pipeline 221, and a circulating pump 223, and the circulating pipeline 221 is filled with a heat conduction medium.

[0029] Specifically, the heat conduction layer 212 is located on the side of the spiral member 214 close to the container body 211, that is, the heat conduction layer 212 constitutes the inner wall of the container body 211, the heat conduction layer 212 is made of austenitic stainless steel, and a plurality of steel wire ropes 2121 are arranged in the heat conduction layer 212 and are uniformly wound in the heat conduction layer 212 along the height direction of the heat conduction layer 212. The steel wire rope 2121 can provide better prestress, thereby improving the strength of the heat conduction layer 212. Through the pre-applied tension, the steel wire rope 2121 can bear most of the stress generated by the high pressure inside during the operation of the equipment, so that the stress borne by the heat conduction layer 212 is greatly reduced, the excessive deformation or even rupture of the container body 211 due to high pressure is avoided, and the structural integrity and stability of the container body 211 in the high-pressure environment are ensured.

[0030] The heat preservation layer 213 is located on the side of the spiral member 214 away from the container body 211, and the heat preservation layer 213 constitutes the outer wall of the container body. The heat preservation layer 213 is composed of a composite material of silicon carbide and aerogel, and the composite material composed of silicon carbide and aerogel has extremely low thermal conductivity, can effectively prevent heat loss to form a strong heat shield, reduce heat loss, and enable the heat of the heat conduction medium in the circulating pipeline 221 to be effectively used in the pressing process of the solid-state battery.

[0031] The helix 214 is a helical rib fixedly connected between the heat-conducting layer 212 and the heat-insulating layer 213, so as to form a helical annular cavity 215 between the heat-conducting layer 212 and the heat-insulating layer 213. The circulating pipeline 221 is laid along the extension direction of the annular cavity 215 to fill the annular cavity 215, and the heat-conducting medium filled in the circulating pipeline 221 is heat-conducting oil. The heating tank 222 rapidly and stably heats the heat-conducting oil to a set temperature through the heating element inside the heating tank 222, and then the heat-conducting oil is circulated between the annular cavity 215 and the heating tank 222 through the circulating pump 223, so as to transfer heat to the working medium and the material in the container body 211, thereby providing relatively stable and uniform heat for the working medium and the material. The heat-conducting layer 212 is made of austenitic stainless steel, which has the advantage of good heat conductivity, can efficiently conduct heat, thereby reducing the heat loss of the heat-conducting oil in the heat transfer process, and further accelerating the temperature rising speed.

[0032] In addition, the temperature control structure 2 further includes a sensing assembly 23 and a heat preservation assembly 24. The sensing assembly 23 includes a temperature sensor 231 and a pressure sensor 232 arranged in the container body 211. The temperature sensor 231 and the pressure sensor 232 can respectively monitor the real-time temperature and pressure in the container body 211, so as to facilitate real-time adjustment of the heating power of the container body 211 and the internal pressure.

[0033] Looking back Figure 1 And Figure 2 The heat preservation assembly 24 includes a heat preservation tank 241, a liquid conveying pipe 242 connected to the heat preservation tank 241, and a liquid conveying pump 243. The heat preservation assembly 24 can temporarily store the liquid medium in the container body 211, so as to avoid waste caused by directly discharging the liquid medium in the container body 211 after processing. Specifically, the heat preservation assembly 24 includes a base 244 arranged below the container body 211, and the heat preservation tank 241 is arranged on the side of the base 244 away from the container body 211. The container body 211 is provided with a liquid inlet 2111 and a liquid outlet 2112. The liquid inlet 2111 is connected to the liquid conveying pipe 242, and the liquid outlet 2112 is communicated with the heat preservation tank 241. A control valve is arranged at the connection between the liquid outlet 2112 and the heat preservation tank 241, and the control valve can be arranged in the base 244. Meanwhile, the inner wall of the heat preservation tank 241 is covered with a polyurethane layer, which has a very low thermal conductivity and can effectively prevent heat loss of the liquid medium stored in the heat preservation tank 241. After the liquid medium and the material in the container body 211 are processed, the liquid medium can flow to the heat preservation tank 241 for temporary storage by opening the control valve. When the liquid medium needs to be processed again, the liquid medium in the heat preservation tank 241 can be conveyed back to the container body 211 by the liquid conveying pump 243, so as to be recycled, thereby saving energy. The heat preservation assembly 24 is particularly suitable for use in a scenario where the isostatic press needs to be frequently started.

[0034] The working principle of the warm isostatic press for solid-state batteries is as follows: first, the mold containing the target sample is smoothly placed into the container body 211, and then the infusion pump 243 is started to transfer the liquid in the incubator 241 to the container body 211 through the infusion tube 242. Subsequently, the heating tank 222 and the circulating pump 223 are started, the heat conducting oil is heated to the set temperature by the heating tank 222, and the heated heat conducting oil is input into the annular oil cavity through the circulating pipeline 221 by the pressure of the circulating pump 223, so that the heat conducting oil can uniformly transfer heat to the target sample in the container body 211. The heat conducting oil in the annular oil cavity flows back to the heating tank 222 through the circulating pipeline 221, forming a closed circulation system. This circulating heating method can ensure that the heat conducting oil always remains within the set temperature range, thereby providing a stable heat source.

[0035] After the temperature reaches the set target, the drive assembly 13 drives the gland 12 to move towards the container body 211, thereby applying pressure to the sample in the container body 211 to the set value. After the sample is pressed, the liquid in the container body 211 is stopped from being discharged into the incubator 241 for storage, and when it is needed to be used again, the stored liquid is delivered into the container body 211 by the infusion pump 243 through the infusion tube 242 for recycling.

[0036] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation method described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

Claims

1. A warm isostatic press for solid state batteries, comprising a pressurizing structure (1), characterized in that, The temperature control structure (2) is arranged on the pressurizing structure (1), and the temperature control structure (2) comprises a container assembly (21) and a temperature control assembly (22) arranged on the container assembly (21); the container assembly (21) comprises a container body (211), and the container body (211) is provided with a heat conduction layer (212) and a heat preservation layer (213); the heat conduction layer (212) and the heat preservation layer (213) are arranged with a spiral element (214) therebetween, the spiral element (214) is arranged in a wrapping manner along the height direction of the container body (211), and the spiral element (214) forms an annular cavity (215); the temperature control assembly (22) comprises a circulating pipeline (221) extending along the annular cavity (215), a heating box (222) connected to the circulating pipeline (221), and a circulating pump (223).

2. A warm isostatic press for solid-state batteries according to claim 1, characterized in that The heat conduction layer (212) is located on the side of the spiral element (214) close to the container body (211), and a plurality of steel wire ropes (2121) are arranged in the heat conduction layer (212) in a wrapping manner.

3. The warm isostatic press for solid-state batteries according to claim 1, characterized in that The temperature control structure (2) further comprises a sensing assembly (23), and the sensing assembly (23) comprises a temperature sensor (231) and a pressure sensor (232) arranged in the container body (211).

4. A warm isostatic press for solid state batteries according to any of claims 1-3, characterized in that The temperature control structure (2) further comprises a heat preservation assembly (24), and the heat preservation assembly (24) comprises a heat preservation box (241), a transfusion pipeline (242) connected to the heat preservation box (241), and a transfusion pump (243); the container body (211) is provided with an inlet (2111) and an outlet (2112), the inlet (2111) is connected to the transfusion pipeline (242), and the outlet (2112) is communicated with the heat preservation box (241).

5. A warm isostatic press for solid state batteries according to claim 4, characterized in that The inner wall of the heat preservation box (241) is covered with a polyurethane layer.

6. A warm isostatic press for solid state batteries according to claim 4, characterized in that The heat preservation assembly (24) comprises a base (244) arranged below the container body (211), and the heat preservation box (241) is arranged on the side, away from the container body (211), of the base (244); a control valve is arranged at the connection between the outlet (2112) and the heat preservation box (241).

7. The warm isostatic press for solid-state batteries according to claim 1, characterized in that The pressurizing structure (1) comprises a support frame (11), the container assembly (21) is arranged in the support frame (11), the support frame (11) is provided with a pressure cover (12) facing the container assembly (21) and a transmission assembly (13) for driving the pressure cover (12).

8. A warm isostatic press for solid state batteries according to claim 7, characterized in that The pressurizing structure (1) further comprises a slide rail (14), the slide rail (14) is arranged below the support frame (11), and the support frame (11) is arranged on the slide rail (14) and can move back and forth along the slide rail (14).

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