Isostatic pressing device for soft package solid-state battery and gas isostatic pressing method for soft package solid-state battery

Abstract

The invention provides an isostatic pressing device for a soft package solid-state battery and a gas isostatic pressing method for the soft package solid-state battery, the isostatic pressing device comprises a compressed gas source supply device, an isostatic pressing cavity device, a pressurization system, a control system and a vacuumizing device, the compressed gas source supply device is communicated with the pressurization system; the isostatic pressing cavity device is communicated with the pressurization system, the vacuumizing device is communicated with the isostatic pressing cavity device, and the control system is used for controlling the compressed air source supply device, the isostatic pressing cavity device, the pressurization system and the vacuumizing device. According to the device and the method, the density of the soft package solid-state battery is effectively improved, and the interface contact of the solid-state battery is enhanced, so that the performance of the soft package solid-state battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, specifically to an isostatic pressing apparatus for pouch solid-state batteries and a gas isostatic pressing method for pouch solid-state batteries. Background Technology

[0002] Technology is advancing rapidly, and the battery industry is also constantly iterating and upgrading. As the market demands increasingly higher battery performance, traditional manufacturing processes are no longer sufficient to meet these needs.

[0003] Currently, battery manufacturing uses liquids such as oil / water as the pressurizing medium, but this easily leads to liquid contamination of pouch solid-state batteries. Furthermore, liquids are almost incompressible, and the pressurization process mainly relies on mechanical displacement (such as plunger pushing), the speed of which is limited by the reciprocating frequency of the pump and the inertia of the fluid, resulting in a relatively slow response and long pressurization time, affecting efficiency. In addition, liquid containers, pump stations, and safety systems are expensive to build and maintain. Moreover, hydraulic oil is flammable and poses a certain danger.

[0004] Therefore, it is necessary to invent a new battery manufacturing apparatus and method to avoid liquid contamination of pouch solid-state batteries, while improving the production efficiency and safety of pouch solid-state batteries and reducing production and maintenance costs. Summary of the Invention

[0005] The primary objective of this invention is to provide an isostatic pressing device for pouch solid-state batteries, addressing the problems of existing battery manufacturing apparatuses and methods being susceptible to liquid contamination, resulting in low production efficiency and poor safety.

[0006] A second objective of the present invention is to provide a gas isostatic pressing method for pouch solid-state batteries, which is implemented by the aforementioned isostatic pressing device for pouch solid-state batteries.

[0007] To achieve the aforementioned first objective, the present invention provides an isostatic pressure device for pouch solid-state batteries, comprising a compressed air supply device, an isostatic pressure chamber device, a pressurization system, a control system, and a vacuuming device. The compressed air supply device is connected to the pressurization system, the isostatic pressure chamber device is connected to the pressurization system, and the vacuuming device is connected to the isostatic pressure chamber device. The control system is used to control the compressed air supply device, the isostatic pressure chamber device, the pressurization system, and the vacuuming device. The isostatic pressure chamber device includes a clamping plate and a plurality of isostatic pressure chambers. The clamping plate is disposed above the isostatic pressure chambers and can move to contact or move away from the top of the isostatic pressure chambers. The isostatic pressure chamber includes an isostatic pressure frame, an isostatic pressure sealing plug, and a heating module. The isostatic pressure sealing plug is used to seal the isostatic pressure frame, the heating module is sleeved outside the isostatic pressure frame, and the pouch solid-state battery can be placed inside the isostatic pressure frame. The isostatic pressure frame is connected to the pressurization system and the vacuuming device.

[0008] As can be seen from the above scheme, the isostatic pressing device of this invention does not use liquids such as oil / water as the pressurizing medium, thus eliminating liquid contamination of the pouch solid-state battery. Furthermore, liquids are flammable, improving production safety. The pressurizing medium is derived from air, which can be directly obtained, eliminating the need for additional equipment and material costs, saving costs. Moreover, the air can be directly discharged, causing no pollution and saving processing space and costs. By setting up several isostatic pressing chambers and pressure plates, the reliability of its sealing is ensured. Multiple isostatic pressing chambers can be used simultaneously, improving production efficiency. Furthermore, the isostatic pressing chambers are equipped with heating modules, enabling simultaneous temperature control. Combined with the vacuum device and pressurization system, this effectively improves the density of the pouch solid-state battery and enhances the interface contact, thereby improving the performance of the pouch solid-state battery.

[0009] A further embodiment is that the isostatic pressure chamber device also includes a first clamping component, which includes a clamping screw and an operating handle. The clamping screw is connected to the clamping plate, and the operating handle drives the clamping plate to move up and down.

[0010] As can be seen from the above scheme, the first clamping component has self-locking properties, which can prevent loosening and ensure the reliability of the isostatic pressure cavity seal.

[0011] A further embodiment is that the isostatic pressing chamber device also includes a second clamping component, which includes a quick-clamping clamp and a clamping rod. The clamping rod can abut against the clamping plate, and the quick-clamping clamp drives the clamping rod to move up and down. Each isostatic pressing chamber is provided with at least one second clamping component.

[0012] As can be seen from the above scheme, the setting of the second clamping component further enhances the reliability of the seal, plays a safety protection role, and facilitates opening and closing.

[0013] A further embodiment is that a portion of the isostatic sealing plug can extend into the isostatic frame, and another portion of the isostatic sealing plug covers the top of the isostatic frame. A sealing gasket is fitted onto the portion of the isostatic sealing plug that extends into the isostatic frame. The upper surface of the sealing gasket abuts against the portion of the isostatic sealing plug that covers the top of the isostatic frame. The outer diameter of the sealing gasket is larger than the opening diameter of the isostatic frame.

[0014] A further option is that the portion of the isostatic sealing plug that extends into the isostatic frame is fitted with at least one sealing ring, and the outer diameter of the sealing ring matches the inner diameter of the isostatic frame.

[0015] As can be seen from the above scheme, the use of gaskets and sealing rings provides multiple layers of sealing to prevent leakage.

[0016] A further option is that the isostatic pressing chamber also includes a material frame, which has several soft-pack solid-state battery placement positions, and the material frame is placed inside the isostatic pressing chamber.

[0017] As can be seen from the above scheme, the placement position of the soft-pack solid-state battery is set according to the shape of the battery, and multiple batteries can be placed, which further improves production efficiency. In addition, it can keep the batteries isolated from each other and prevent them from being squeezed.

[0018] A further embodiment is that the isostatic pressure chamber device also includes a base and a housing. The base is provided with placement slots that match the number of isostatic pressure chambers, and the isostatic pressure chambers are placed on the placement slots. The housing is located outside the isostatic pressure chambers and the clamping plate.

[0019] As can be seen from the above scheme, the placement groove ensures the stable placement of the isostatic cavity and prevents it from moving. The shell protects the isostatic cavity and enhances safety.

[0020] A further design includes a top plate and a perimeter protective door, which is openable and made of transparent material.

[0021] As can be seen from the above scheme, the transparent protective door around the perimeter facilitates real-time observation of the isostatic pressure chamber.

[0022] To achieve the second objective mentioned above, the present invention provides a gas isostatic pressing method for pouch solid-state batteries. The gas isostatic pressing method is implemented using an isostatic pressing device for pouch solid-state batteries as described in any of the above embodiments. The gas isostatic pressing method includes the following steps: S1: Placing the pouch solid-state battery in an isostatic pressing frame; S2: Covering the pouch solid-state battery with an isostatic pressing sealing plug and abutting the pressing plate against the isostatic pressing sealing plug to seal the isostatic pressing chamber; S3: Setting a heating temperature and heating the isostatic pressing chamber using a heating module; S4: Setting a vacuum pressure value and starting a vacuum pump to evacuate the isostatic pressing chamber until the vacuum pressure value is reached, at which point the vacuum pumping stops; S5: A compressed air supply device generates low-pressure compressed air, which enters a pressurization system for pressure setting and then enters the isostatic pressing chamber to uniformly pressurize the pouch solid-state battery. The pressure setting includes several pressure stages with different pressure values ​​and times; S6: After isostatic pressing is completed, the pressing plate is moved away from the isostatic pressing chamber, the isostatic pressing sealing plug is opened, and the finished pouch solid-state battery is removed.

[0023] As can be seen from the above scheme, the isostatic pressing method can improve the density of pouch solid-state batteries and enhance the interfacial contact, thereby improving the performance of pouch solid-state batteries. Setting different pressure stages can make the pouch solid-state batteries compacted more uniformly and without damage, improving the quality and performance of pouch solid-state batteries.

[0024] A further proposed approach is to set the pressure in step S5 as follows: First pressure stage: isostatic pressure value of 0MPa~5MPa, pressure application time greater than 120min; Second pressure stage: isostatic pressure value greater than 90MPa, pressure application time less than 1min; Third pressure stage: isostatic pressure value of 0MPa~5MPa, pressure application time of 0min~10min; Fourth pressure stage: isostatic pressure value of 0MPa, pressure application time of 0min~1min.

[0025] As can be seen from the above scheme, the first pressure stage involves a long period of low-pressure pre-isostatic pressing to reduce damage to the pouch solid-state battery; the second pressure stage involves a short period of high pressure to make the pouch solid-state battery more compact; the third pressure stage involves a short period of low pressure to stabilize the performance of the pouch solid-state battery; and the fourth pressure stage is for pressure release. By adopting segmented pressurization and a combination of low and high pressure for gas isostatic pressing, and by setting the pressure and time of the four stages, the quality and performance of the pouch solid-state battery are significantly improved. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the isostatic pressing device for soft-pack solid-state batteries according to the present invention.

[0027] Figure 2 This is a schematic diagram of the isostatic pressure cavity device of the present invention.

[0028] Figure 3 This is a schematic diagram of the isostatic pressure cavity device of the present invention without the surrounding protective door.

[0029] Figure 4 This is an exploded view of the isostatic pressure cavity of the present invention.

[0030] Figure 5 This is a schematic diagram of the air path system of the isostatic chamber device of the present invention.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0032] See Figures 1 to 5 The isostatic pressure device for soft-pack solid-state batteries provided in this embodiment includes a compressed air supply device 2, an isostatic pressure chamber device 1, a pressurization system and a control system 3, a vacuum pumping device 4, and a support base 5. The isostatic pressure chamber device 1 and the vacuum pumping device 4 are placed on the support base 5. The compressed air supply device 2 is connected to the pressurization system and the control system 3, the isostatic pressure chamber device 1 is connected to the pressurization system and the control system 3, and the vacuum pumping device 4 is connected to the isostatic pressure chamber device 1. The control system in the pressurization system and the control system 3 is used to control the compressed air supply device 2, the isostatic pressure chamber device 1, the pressurization system in the pressurization system and the control system 3, and the vacuum pumping device 4.

[0033] In this embodiment, the isostatic pressure chamber device 1 is an air source compressor. The pressurization system in the pressurization system and control system 3 is an air pressurization system, and the control system in the pressurization system and control system 3 is a PLC control system. The vacuum pump device 4 is a vacuum pump.

[0034] See Figures 2 to 4 The isostatic pressure chamber device 1 includes a base 11, a housing 12, a first clamping member 13, a second clamping member 14, a clamping plate 15, three isostatic pressure chambers 16, and a support column 17. The base 11 is provided with placement positions 111 matching the number of isostatic pressure chambers 16, and the isostatic pressure chambers 16 are placed on the placement positions 111. The housing 12 is disposed outside the isostatic pressure chambers 116 and the clamping plate 15. The clamping plate 15 is disposed above the isostatic pressure chambers 16, and the clamping plate 15 can move to contact or move away from the top of the isostatic pressure chambers 16.

[0035] The housing 12 includes a top plate 121 and a peripheral protective door 122. The peripheral protective door 122 is openable and made of transparent material. The support column 17 is fixed to the base 11 and is fixedly connected to the top plate 121, serving to support the top plate 121.

[0036] The first clamping component 13 includes a clamping screw 132 and an operating handle 131. The clamping screw 132 passes through the top plate 121 and is connected to the clamping plate 15. The operating handle 131 drives the clamping plate 15 to move up and down. The clamping screw 132 is a trapezoidal screw and has self-locking properties.

[0037] The second clamping member 14 includes a quick clamping clamp 141 and a clamping rod 142. The clamping rod 142 can pass through the top plate 121 and abut against the clamping plate 15. The quick clamping clamp 141 drives the clamping rod 142 to move up and down. Each isostatic pressure cavity 16 is provided with at least one second clamping member 14. In this embodiment, two second clamping members 14 are provided on one isostatic pressure cavity 16, and the two second clamping members 14 are symmetrically arranged with the central axis of the isostatic pressure cavity 16 as the axis.

[0038] See Figure 4 The isostatic chamber 16 includes an isostatic frame 165, an isostatic sealing plug 161, a heating module 167, and a material frame 164. The isostatic sealing plug 161 is used to seal the isostatic frame 165. The heating module 167 is sleeved outside the isostatic frame 165, and the material frame 164 is placed inside the isostatic frame 165. The material frame 164 is provided with several soft-pack solid-state battery placement positions for placing soft-pack solid-state batteries 6.

[0039] A portion of the isostatic sealing plug 151 can extend into the isostatic frame 165, and another portion of the isostatic sealing plug 161 covers the top of the isostatic frame 165. The portion of the isostatic sealing plug 161 that extends into the isostatic frame is fitted with a sealing gasket 162. The upper surface of the sealing gasket 162 abuts against the portion of the isostatic sealing plug 161 that covers the top of the isostatic frame 165. The outer diameter of the sealing gasket 162 is larger than the opening diameter of the isostatic frame 165.

[0040] The portion of the isostatic sealing plug 161 that extends into the isostatic frame 165 is fitted with two layers of sealing rings 163, the outer diameter of the sealing rings 163 matching the inner diameter of the isostatic frame 165.

[0041] The isostatic frame 165 is provided with a vacuum port 1662 and a pressurized gas inlet 1661. The heating module 167 is provided with a through hole 1671 corresponding to the positions of the vacuum port 1662 and the pressurized gas inlet 1661.

[0042] See Figure 5 In this embodiment, the isostatic pressing device for soft-pack solid-state batteries uses an air source compressor (referred to as the air compressor in the figure) as the power source. The output compressed air is purified by a filter and then divided into two paths. One path is used as pre-pressurized gas, which enters the booster pump through a pressure regulator, an inlet pressure sensor, and an input air control valve. The other path is used as the booster pump start-up gas, which drives the booster pump to perform secondary pressurization on the pre-pressurized gas through a pressure regulator and an input air control valve. The pressurized high-pressure gas is output as boosted output gas after being monitored by an output air control valve, an output pressure gauge, and an output pressure sensor. The booster pump is also equipped with a safety valve, which, together with the boosted output gas and the high-pressure relief valve, ensures safe operation. At the same time, the vacuum pump performs vacuuming operation on the isostatic pressing chamber through a vacuum pump control valve and a pressure gauge. The gas valves, pump body, and sensor signals of the entire system are all uniformly collected and controlled by the PLC control system, realizing automated and precise control of pressure, vacuum degree, and process sequence, providing stable and reliable operating conditions for the isostatic pressing process. Except for the air source compressor (referred to as air compressor in the figure), vacuum pump, pressure gauge connected to the vacuum pump, vacuum pump control valve, and isostatic chamber, the rest of the components are all located in the pressurization system and control system 3. Figure 5 The solid line represents the airflow path, and the dashed line represents the control signal path.

[0043] This invention provides a gas isostatic pressing method for pouch solid-state batteries. The gas isostatic pressing method is implemented using the aforementioned isostatic pressing device for pouch solid-state batteries, and includes the following steps: S1: Place the soft-pack solid-state battery 6 into the material frame 164; S2: Cover the isostatic pressure sealing plug 161 and make the clamping plate 15 abut against the isostatic pressure sealing plug 161 to seal the isostatic pressure cavity 16; specifically, clamping is achieved by the first clamping member 13 and the second clamping member 14. S3: Set the heating temperature so that the heating module 167 heats the isostatic pressure cavity 16. The heating temperature is 30℃~200℃. S4: Set the vacuum pressure value, start the vacuum pumping device 4, and pump the isostatic pressure chamber 16 until the vacuum pressure value is reached. The vacuum pressure value is -93Kpa to -99.9Kpa. S5: The compressed air supply device 2 generates low-pressure compressed air of 0 MPa to 0.8 MPa. After the low-pressure compressed air enters the pressurization system and is pressure-set, it enters the isostatic chamber 16 to uniformly pressurize the soft-pack solid-state battery 6. The pressure setting includes several pressure stages with different pressure values ​​and times. Specifically, the pressure settings are as follows: First pressure stage: isostatic pressure value of 0 MPa to 5 MPa, pressure application time greater than 120 min; Second pressure stage: isostatic pressure value greater than 90 MPa, pressure application time less than 1 min; Third pressure stage: isostatic pressure value of 0 MPa to 5 MPa, pressure application time of 0 min to 10 min; Fourth pressure stage: isostatic pressure value of 0 MPa, pressure application time of 0 min to 1 min.

[0044] S6: After the isostatic pressing is completed, the clamping plate 15 is moved away from the isostatic pressing cavity 16, the isostatic pressing sealing plug 161 is opened, and the finished soft-pack solid battery is taken out.

[0045] This invention employs an isostatic pressing device that does not use oil / water or other liquids as the pressurizing medium, thus eliminating liquid contamination of the pouch solid-state battery. Furthermore, liquids are flammable, improving production safety. The pressurizing medium is derived from air, which is directly available, requiring no additional equipment or material costs, saving costs. Air can also be directly discharged, causing no pollution and saving processing space and costs. By setting up several isostatic pressing chambers and pressure plates, the reliability of the seal is ensured. Multiple isostatic pressing chambers can be used simultaneously, improving production efficiency. The isostatic pressing chambers are equipped with heating modules, enabling simultaneous temperature control. Combined with a vacuum device and pressurization system, this effectively improves the density of the pouch solid-state battery and enhances the interface contact, thereby improving the performance of the pouch solid-state battery. The isostatic pressing method includes different pressure stages: the first pressure stage is a long-term low-pressure pre-isostatic pressing to reduce damage to the pouch solid-state battery; the second pressure stage is a short-term high-pressure stage to make the pouch solid-state battery more dense; the third pressure stage is a short-term low-pressure stage to stabilize the performance of the pouch solid-state battery; and the fourth pressure stage is a pressure release stage. By employing segmented pressurization and a combination of low and high pressure for gas isostatic pressing, and by setting four stages of pressure and time, the compaction of the pouch solid-state battery can be made more uniform and without damage, thereby improving the quality and performance of the pouch solid-state battery.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An isostatic pressing device for pouch solid-state batteries, characterized in that: It includes a compressed air supply device, an isostatic pressure chamber device, a pressurization system, a control system, and a vacuum pumping device. The compressed air supply device is connected to the pressurization system, the isostatic pressure chamber device is connected to the pressurization system, and the vacuum pumping device is connected to the isostatic pressure chamber device. The control system is used to control the compressed air supply device, the isostatic pressure chamber device, the pressurization system, and the vacuum pumping device. The isostatic pressure chamber device includes a clamping plate and a plurality of isostatic pressure chambers. The clamping plate is disposed above the isostatic pressure chambers and can move to contact or move away from the top of the isostatic pressure chambers. The isostatic chamber includes an isostatic frame, an isostatic sealing plug, and a heating module. The isostatic sealing plug is used to seal the isostatic frame. The heating module is sleeved on the outside of the isostatic frame. A soft-pack solid-state battery can be placed inside the isostatic frame. The isostatic frame is connected to the pressurization system and the vacuum pump.

2. The isostatic pressing device for pouch solid-state batteries as described in claim 1, characterized in that: The isostatic pressure chamber device further includes a first clamping member, which includes a clamping screw and an operating handle. The clamping screw is connected to the clamping plate, and the operating handle drives the clamping plate to move up and down.

3. The isostatic pressing device for pouch solid-state batteries as described in claim 1, characterized in that: The isostatic pressure chamber device further includes a second clamping component, which includes a quick-clamping clamp and a clamping rod. The clamping rod can abut against the clamping plate. The quick-clamping clamp drives the clamping rod to move up and down. Each isostatic pressure chamber is provided with at least one second clamping component.

4. An isostatic pressing device for pouch solid-state batteries as described in any one of claims 1 to 3, characterized in that: A portion of the isostatic sealing plug can extend into the isostatic frame, and another portion of the isostatic sealing plug covers the top of the isostatic frame. A sealing gasket is fitted onto the portion of the isostatic sealing plug that extends into the isostatic frame. The upper surface of the sealing gasket abuts against the portion of the isostatic sealing plug that covers the top of the isostatic frame. The outer diameter of the sealing gasket is larger than the opening diameter of the isostatic frame.

5. The isostatic pressing device for pouch solid-state batteries as described in claim 4, characterized in that: The portion of the isostatic sealing plug that extends into the isostatic frame is fitted with at least one sealing ring, and the outer diameter of the sealing ring matches the inner diameter of the isostatic frame.

6. An isostatic pressing device for pouch solid-state batteries as described in any one of claims 1 to 3, characterized in that: The isostatic pressing chamber also includes a material frame, which has several soft-pack solid-state battery placement positions, and the material frame is placed inside the isostatic pressing chamber.

7. An isostatic pressing device for pouch solid-state batteries as described in any one of claims 1 to 3, characterized in that: The isostatic pressure chamber device further includes a base and a housing. The base is provided with a placement slot that matches the number of isostatic pressure chambers, and the isostatic pressure chambers are placed on the placement slots. The housing is disposed outside the isostatic cavity and the clamping plate.

8. The isostatic pressing device for pouch solid-state batteries as described in claim 7, characterized in that: The housing includes a top plate and a peripheral protective door, which is openable and made of transparent material.

9. A gas isostatic pressing method for soft-pack solid-state batteries, characterized in that, The gas isostatic pressing method is implemented using an isostatic pressing device for pouch solid-state batteries as described in any one of claims 1 to 8, and the gas isostatic pressing method includes the following steps: S1: Place the soft-pack solid-state battery inside the isostatic frame; S2: Cover the isostatic pressure sealing plug and make the clamping plate abut against the isostatic pressure sealing plug to seal the isostatic pressure cavity; S3: Set the heating temperature so that the heating module heats the isostatic chamber; S4: Set the vacuum pressure value, start the vacuum pumping device, and pump the isostatic chamber to the vacuum pressure value and then stop the vacuum pumping. S5: The compressed air supply device generates low-pressure compressed air. The low-pressure compressed air enters the pressurization system and, after the pressure is set, enters the isostatic chamber to uniformly pressurize the soft-pack solid-state battery. The pressure setting includes several pressure stages with different pressure values ​​and times. S6: After the isostatic pressing is completed, the clamping plate is moved away from the isostatic pressing cavity, the isostatic pressing sealing plug is opened, and the finished soft-pack solid-state battery is taken out.

10. The gas isostatic pressing method for pouch solid-state batteries as described in claim 9, characterized in that: The pressure setting in step S5 is as follows: First pressure stage: The isostatic pressure value is 0MPa~5MPa, and the pressure application time is greater than 120min; Second pressure stage: The isostatic pressure value is greater than 90MPa, and the pressure application time is less than 1min; Third pressure stage: the isostatic pressure value is 0MPa~5MPa, and the pressure application time is 0min~10min; Fourth pressure stage: The isostatic pressure value is 0 MPa, and the pressure application time is 0 min to 1 min.

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