Pressurizing mechanism, solid-state battery charging and discharging testing device and method

Abstract

The invention relates to the technical field of solid-state battery performance testing, in particular to a pressurizing mechanism and a solid-state battery charging and discharging testing device and method. The pressurizing mechanism is used for applying pressure to a solid-state battery and comprises an isostatic pressing cabin and a gas supply assembly, a containing cavity used for containing the solid-state battery is formed in the isostatic pressing cabin, the gas supply assembly is connected with the isostatic pressing cabin, and the gas supply assembly is used for supplying inert gas into the isostatic pressing cabin. During testing, the solid-state battery is placed in the accommodating cavity, the gas supply assembly supplies inert gas into the isostatic pressing cabin, so that an isostatic pressing environment of high-pressure inert gas is formed in the isostatic pressing cabin, and all-around uniform pressure is applied to the solid-state battery by utilizing the static pressing characteristic of gas; the interface of the solid-state battery is uniformly pressed, so that uniform pressure distribution can be formed, the condition that the interior of the battery is concentrated is not easy to occur, and the test accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery performance testing technology, specifically to a pressurization mechanism, a solid-state battery charge-discharge testing device and method. Background Technology

[0002] In current solid-state batteries, the pressure application method is usually mechanical extrusion, which applies pressure to the battery through a plate, clamp, etc., and performs solid-state battery cycle testing under constant pressure.

[0003] However, this method has obvious drawbacks. Mechanical pressure is usually unidirectional, and unidirectional axial pressure is difficult to achieve uniform pressure on the solid-state battery interface. Uneven pressure distribution leads to stress concentration inside the battery, affecting the accuracy of the test and may even damage the solid-state battery. Summary of the Invention

[0004] (i) The problem that this invention aims to solve is that mechanical pressure is usually unidirectional, and unidirectional axial pressure is difficult to achieve uniform pressure on the interface of solid-state batteries. Uneven pressure distribution leads to stress concentration inside the battery, affecting the accuracy of testing, and may even damage the solid-state battery.

[0005] (II) Technical Solution The present invention provides a pressurization mechanism for applying pressure to a solid-state battery, comprising an isostatic chamber and a gas supply assembly; The isostatic chamber is equipped with a cavity for accommodating solid-state batteries. The gas supply assembly is connected to the isostatic chamber, and the gas supply assembly is used to supply inert gas into the isostatic chamber.

[0006] According to one embodiment of the present invention, the receiving cavity is provided with a limiting component for limiting the solid-state battery.

[0007] According to one embodiment of the present invention, the isostatic pressure chamber has an air inlet and an air outlet communicating with the receiving cavity; The gas supply component is connected to the gas inlet and is used to supply argon gas into the receiving cavity. A switch valve is provided at the gas outlet.

[0008] According to one embodiment of the present invention, the gas supply assembly includes an argon cylinder, a first connecting pipe, and a pressure reducing valve; The outlet end of the argon cylinder is connected to the inlet end of the pressure reducing valve, the outlet end of the pressure reducing valve is connected to one end of the first connecting pipe, and the other end of the first connecting pipe is connected to the air inlet. The air outlet is equipped with a switch valve.

[0009] According to one embodiment of the present invention, the limiting assembly includes a first plate, a second plate, and an adjusting member; The solid-state battery is placed between the first plate and the second plate, and the adjusting member is used to adjust the distance between the first plate and the second plate; Both the first plate and the second plate have multiple transfer holes.

[0010] According to one embodiment of the present invention, the adjusting member includes a screw and an adjusting nut; The screw is connected to the first plate, and the second plate has a through hole. The screw passes through the through hole and is screwed to the adjusting nut.

[0011] According to one embodiment of the present invention, the isostatic pressure chamber is provided with a pressure gauge for detecting the pressure of the containment cavity; The isostatic pressure chamber includes a chamber body and a door; The cabin and the hatch are detachably and sealed together.

[0012] According to one embodiment of the present invention, the pressurization mechanism further includes an air extraction assembly connected to the isostatic chamber, the air extraction assembly being used to extract gas from the isostatic chamber.

[0013] A solid-state battery charge and discharge testing device includes a pressurization mechanism and an electrical testing module. The electrical testing module includes two electrode leads. One end of each electrode lead passes through the receiving cavity and is connected to a pen clip. The other end of each electrode lead is connected to an electrical testing device. The two pen clips are respectively connected to the positive and negative terminals of the solid-state battery.

[0014] A method for testing the charge and discharge of a solid-state battery includes the following steps: S1. Position the solid-state battery within the positioning component and connect the pen clip to the positive and negative terminals of the solid-state battery. S2. Inert gas is supplied into the receiving cavity through the gas supply assembly to replace and remove the air in the receiving cavity; S3. Turn on the gas supply component to fill the cavity with argon gas until the first threshold is reached, so as to form an isostatic pressure environment in the cavity. S4. Turn on the electrical testing equipment and perform charge-discharge cycle tests on the solid-state battery.

[0015] According to one embodiment of the present invention, between steps S1 and S2, the following step is further provided: The gas inside the containment chamber is extracted using the air extraction assembly.

[0016] The beneficial effects of this invention are: During testing, after the solid-state battery is placed in the limiting component and positioned, the gas supply component supplies inert gas into the isostatic chamber, creating an isostatic pressure environment with high-pressure inert gas. Utilizing the static pressure characteristics of the gas, uniform pressure is applied to the solid-state battery from all directions. Compared to traditional mechanical extrusion methods, the solid-state battery interface is uniformly pressurized, resulting in a uniform pressure distribution. This reduces the likelihood of pressure concentration inside the battery, improves testing accuracy, and minimizes the risk of damaging the solid-state battery. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A perspective view of the pressurization mechanism provided in an embodiment of the present invention; Figure 2 This is a limiting component provided in an embodiment of the present invention.

[0019] Icons: 1. Isostatic pressure chamber; 11. Chamber body; 2. Gas supply assembly; 201. Argon cylinder; 202. Pressure reducing valve; 203. First connecting pipe; 3. Limiting assembly; 301. First plate; 302. Second plate; 303. Screw; 304. Adjusting nut; 4. Pressure gauge; 5. Switch valve. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: like Figures 1-2 As shown, one embodiment of the present invention provides a pressurization mechanism for applying pressure to a solid-state battery, including an isostatic chamber 1 and an air supply assembly 2; The isostatic pressure chamber 1 is equipped with a cavity for accommodating solid-state batteries; The gas supply assembly 2 is connected to the isostatic pressure chamber 1 and is used to supply inert gas into the isostatic pressure chamber 1.

[0022] During testing, the solid-state battery is placed in the containment cavity, and the gas supply component 2 supplies inert gas into the isostatic pressure chamber 1, creating an isostatic pressure environment with high-pressure inert gas in the isostatic pressure chamber 1. The static pressure characteristics of the gas are used to apply uniform pressure to the solid-state battery from all directions. Compared with the traditional mechanical extrusion method, the solid-state battery interface is uniformly pressurized, which can form a uniform pressure distribution and is less likely to cause pressure concentration inside the battery, thus improving the accuracy of the test and making it less likely to damage the solid-state battery.

[0023] It is important to know that a uniform pressure environment can keep the electrode-electrolyte interface contact of a solid-state battery stable, avoiding fluctuations in contact resistance caused by uneven mechanical pressure. As a result, the test data of a solid-state battery during charge-discharge cycles can better reflect its actual performance, thus improving accuracy.

[0024] The gas supply component 2 uses inert gas because high-pressure inert gas can both transmit pressure and isolate oxygen and water vapor in the air, thus preventing oxidation and hydrolysis of the solid-state battery during high-pressure testing and ensuring the stability of the battery's electrochemical characteristics during the test.

[0025] According to one embodiment of the present invention, the isostatic pressure chamber 1 has an air inlet and an air outlet communicating with the receiving cavity; The gas supply component 2 is connected to the gas inlet and is used to supply argon gas into the cavity. A switch valve 5 is provided at the gas outlet.

[0026] Specifically, the gas supply assembly 2 includes an argon cylinder 201, a first connecting pipe 203, and a pressure reducing valve 202, which is a precision pressure reducing valve. The outlet end of the argon cylinder 201 is connected to the inlet end of the pressure reducing valve 202, the outlet end of the pressure reducing valve 202 is connected to one end of the first connecting pipe 203, and the other end of the first connecting pipe 203 is connected to the air inlet of the isostatic pressure chamber 1. The pressure reducing valve 202 enables precise control of argon pressure. It can adjust the output pressure to a suitable range according to the test requirements, avoiding damage to the solid-state battery or equipment failure caused by the gas source pressure being too high and directly entering the containment cavity. At the same time, it ensures a smooth pressure rise process and guarantees the safety and stability of the isostatic pressure environment. Argon, as an inert medium, completely eliminates the harmful effects of oxygen and moisture on sensitive battery materials, while providing truly isotropic and absolutely uniform pressure. The gas pressure is easily controlled, allowing for rapid and stable pressure increases and decreases, facilitating pressure cycling tests or studies that do not affect battery performance through force. This pressurization mechanism is particularly suitable for solid-state battery interface research where high pressure uniformity is required, as well as all high-precision electrochemical tests that need to be performed in an inert atmosphere.

[0027] Argon cylinder 201 contains high-purity argon gas and can be connected to one side of isostatic chamber 1 via a connecting rod.

[0028] Of course, in this embodiment, the gas supply component 2 can also supply inert gases such as nitrogen. For example, the argon cylinder 201 in the gas supply component 2 can also be replaced with a nitrogen cylinder, which can also provide inert gas into the cavity and create a high-pressure and stable environment for the cavity. Its purpose has not departed from the design concept of the present invention, and therefore, it should fall within the protection scope of the present invention.

[0029] According to one embodiment of the present invention, the isostatic pressure chamber 1 includes a chamber body 11 and a door; The hull 11 and the hatch are detachably and sealed together.

[0030] It is important to know that the detachable sealed connection facilitates the insertion and removal of solid-state batteries, provides ample operating space, reduces the difficulty of installing and removing solid-state batteries, and improves the convenience of the testing process. The sealed connection design ensures the airtightness of the containment cavity, avoids gas leakage during the pressure environment construction process, ensures the stability and durability of the pressure, and prevents the waste of inert gas, thereby reducing testing costs. The detachable design also facilitates the cleaning, maintenance, and inspection of the isostatic pressure chamber 1, such as cleaning residual impurities and checking the status of limit components, extending the service life of the equipment and ensuring long-term stable operation.

[0031] Preferably, the hull 11 and the hatch are detachably and sealingly connected by fasteners, including locking bolts and sealing rings. Threaded holes are provided on the top wall of the hull 11. The hatch includes a first door panel and a second door panel connected together. The first door panel is larger than the second door panel, meaning its length and width are both greater than the second door panel. The thickness of the first and second door panels is not limited. Multiple circular holes are provided around the first door panel, and the projection of the circular holes onto the first door panel is perpendicular to the second door panel. The projections of the door panels on the first door panel are completely non-overlapping. The locking bolts, round holes, and threaded holes are set one-to-one. The side wall of the second door panel has a groove, and a sealing ring is connected in the groove. The shape of the second door panel is the same as the shape of the opening of the cabin 11, and the size of the second door panel is slightly smaller than the size of the opening of the cabin 11. When the locking bolt passes through the corresponding round hole and is screwed into place with the corresponding threaded hole, the sealing ring is compressed, sealing the gap between the second door panel and the opening. At this time, a completely sealed cavity can be formed, ensuring that the argon gas will not leak when it is injected into the cavity.

[0032] Of course, in this embodiment, sealing can also be achieved through other means, as long as it ensures that the receiving cavity is a sealed chamber.

[0033] According to one embodiment of the present invention, the isostatic pressure chamber 1 is equipped with a pressure gauge 4 for detecting the pressure in the containment chamber. This allows for real-time monitoring of the pressure magnitude within the containment chamber and whether the pressure is stable.

[0034] The pressure gauge 4 can display the pressure value in the containment cavity in real time, which makes it easy for operators to accurately control the pressure changes and ensure that the pressure can accurately reach and maintain the first threshold, avoiding the impact of pressure deviation on the validity of the test results. Real-time pressure monitoring can detect pressure anomalies (such as pressure leakage, overpressure, etc.) in a timely manner, allowing operators to take quick countermeasures, ensuring the safety of the testing process, and preventing damage to solid-state batteries due to pressure anomalies. Pressure gauge 4 is connected to the battery testing equipment via signal communication. The setting of pressure gauge 4 enables traceability of pressure control. The pressure data during the test can serve as an important part of the test record, improving the standardization and repeatability of the test.

[0035] According to one embodiment of the present invention, a limiting component 3 for limiting the solid-state battery is provided in the receiving cavity. The purpose of using the limiting component 3 to limit the solid-state battery is to prevent the solid-state battery from moving around when the initial pressure is applied.

[0036] According to one embodiment of the present invention, the limiting component 3 includes a first plate 301, a second plate 302, and an adjusting member; The solid-state battery is placed between the first plate 301 and the second plate 302, and the adjusting member is used to adjust the distance between the first plate 301 and the second plate 302. Multiple transfer holes are provided on both the first plate 301 and the second plate 302.

[0037] The spacing between the two plates can be flexibly adjusted according to the thickness of the solid-state battery, so as to achieve stable positioning of solid-state batteries of different specifications and improve the versatility of the positioning component 3.

[0038] The arrangement of the first plate 301 and the second plate 302 can form a bidirectional clamping limit for the solid-state battery, which not only ensures the stability of the solid-state battery in the pressure environment, but also prevents the uniform encapsulation of inert gas from being affected by excessive clamping, thus achieving a balance between limiting stability and pressure uniformity.

[0039] It should be noted that the first plate 301 and the second plate 302 only serve to limit the solid-state battery. Through the provided transfer holes, gas can be quickly filled between the first plate 301 and the second plate 302 to ensure that pressure is applied evenly to the entire outer surface of the solid-state battery from all directions. Preferably, multiple transfer holes are evenly spaced, and the diameter of the transfer holes is 2mm-5mm.

[0040] According to one embodiment of the present invention, the adjusting member includes a screw 303 and an adjusting nut 304; The screw 303 is connected to the first plate 301. The second plate 302 has a through hole. The screw 303 passes through the through hole and is screwed to the adjusting nut 304.

[0041] The adjustment method of screw 303 and adjusting nut 304 has high-precision adjustment characteristics, which can realize the micro-adjustment of the distance between the first plate 301 and the second plate 302, accurately adapt to solid batteries of different thicknesses, ensure the tightness and stability of the limit, and avoid the battery from undergoing slight displacement during the test. The threaded structure has a self-locking function, which can keep the maximum distance between the two plates fixed after adjustment. The distance will not change due to the pressure of the isostatic environment, ensuring the durability and reliability of the limiting effect. In addition, the cooperation structure between the screw 303 and the adjusting nut 304 is simple and easy to operate. The distance adjustment can be completed without complicated tools, which reduces the difficulty of operating the equipment. At the same time, the structure has high strength and durability, making it suitable for long-term repeated testing scenarios.

[0042] Furthermore, a first placement groove can be formed on the first plate 301, and the thickness of the solid-state battery is adapted to the depth of the first placement groove. This ensures that when the adjusting nut 304 is turned, it will not be over-tightened, causing the second plate 302 to exert excessive mechanical pressure on the solid-state battery, which would affect the test results of the solid-state battery. One side of the first placement groove penetrates through the side wall of the first plate 301.

[0043] Optionally, a first square groove can be formed on the first plate 301 and a second square groove can be formed on the second plate 302. The projection of the first square groove can fall completely into the second square groove, and the sum of the depth of the first square groove and the depth of the second square groove is not greater than the thickness of the solid-state battery.

[0044] Of course, there are other ways to prevent the second plate 302 from getting too close to the first plate 301. For example, a fixing nut can be installed on the screw 303 and the position of the fixing nut can be adjusted so that the distance from the side of the fixing nut close to the second plate 302 to the first plate 301 is equal to the thickness of the solid-state battery. The purpose of this method does not deviate from the design concept of this invention, and therefore, it should fall within the protection scope of this invention.

[0045] In another embodiment, the limiting component 3 includes a base frame with multiple holes on each side wall. The shape of the holes is not limited, as long as high-pressure gas from outside the base frame can enter the base frame. A top cover is provided on the top of the base frame, with one side of the top cover hinged to the base frame and the other side detachably connected to the base frame. Placing the solid-state battery inside the base frame can also limit the solid-state battery's position. This design does not depart from the spirit of the present invention and therefore should fall within the scope of protection of the present invention.

[0046] When installing the limiting component 3 into the receiving cavity, it should be noted that in order to allow gas to flow on the bottom side of the solid-state battery, a certain gap is left between the bottom of the first plate 301 and the bottom wall of the receiving cavity. The limiting component 3 can be placed directly into the receiving cavity. At this time, in order to prevent the high-pressure gas from blowing the limiting component 3, a counterweight can be added to the bottom wall of the first plate 301. The counterweight is fixedly connected to the first plate 301. At this time, the counterweight can not only prevent the first plate 301 from moving, but also support the first plate 301, so that the high-pressure inert gas flows upward from the bottom wall of the first plate 301 and contacts the bottom of the solid-state battery.

[0047] It should be noted that, preferably, the projection of the counterweight on the bottom wall of the cavity does not coincide with the projection of the solid-state battery on the bottom wall of the cavity, that is, the counterweight does not affect the passage of high-pressure inert gas through the transmission hole on the first plate 301.

[0048] Of course, a support rod can also be directly connected to the bottom of the first plate 301, with the other end of the support rod connected to the bottom of the receiving cavity, which can also fix the first plate 301 in place. The purpose of this invention does not deviate from the design concept of the present invention, and therefore, it should fall within the protection scope of the present invention.

[0049] It should be noted that, regardless of the structure of the limiting component 3, it can be made of high-strength aluminum alloy.

[0050] According to one embodiment of the present invention, the pressurization mechanism further includes an air extraction assembly connected to the isostatic chamber 1, which is used to extract gas from the isostatic chamber 1.

[0051] Preferably, a vacuum evacuation port is provided on one side of the isostatic pressure chamber 1, and the evacuation assembly includes a first vacuum line, a vacuum valve, a second vacuum line and a vacuum pump arranged in sequence; a vacuum pressure gauge is provided on the first vacuum line. Before evacuation, close the vacuum valve, confirm that the isostatic pressure chamber 1 is well sealed, and ensure the pen clip is connected to the battery. To evacuate, first turn on the vacuum pump, preferably a rotary vane vacuum pump. When the vacuum pump is turned on, its internal vane rotor rotates at high speed, expelling the gas inside the pump chamber and creating a preliminary negative pressure. Then, open the vacuum valve. Under the pressure difference between the atmospheric pressure and the negative pressure in the pump chamber, the gas inside the isostatic pressure chamber 1 continuously enters the pump chamber through the vacuum cycle port, the first vacuum line, the vacuum valve, and the second vacuum line, and is quickly discharged into the outside atmosphere by the pump body. When stopping, first observe the vacuum level in the chamber using a vacuum pressure gauge. Once the preset value (e.g., -0.1 MPa) is reached, first close the vacuum valve, then turn off the rotary vane vacuum pump. At this point, a sealed negative pressure environment is formed inside the chamber, completing the evacuation operation.

[0052] Of course, in this embodiment, the vacuum assembly can also take other forms, as long as the purpose of vacuuming is achieved.

[0053] The combination of the extraction component and the gas supply component 2 forms a complete gas environment control chain of "vacuuming - inert gas replacement - pressurization", which further improves the purity and stability of the isostatic environment in the containment cavity and provides a guarantee for subsequent high-precision testing of solid-state batteries.

[0054] Example 2: A solid-state battery charge and discharge testing device includes a pressurization mechanism and an electrical testing module. The electrical testing module includes two electrode leads. One end of each electrode lead passes through a receiving cavity and is connected to a pen clip. The other end of each lead is connected to an electrical testing device. The two pen clips are respectively connected to the positive and negative terminals of the solid-state battery.

[0055] The electrode leads of the electrical test module are connected to the positive and negative terminals of the solid-state battery through a pen clip. The connection method is simple and reliable. The pen clip has good conductivity and clamping stability, ensuring smooth circuit conduction during the charge and discharge test and avoiding the impact of poor contact on the test data. The design of inserting electrode leads into the receiving cavity ensures the effectiveness of electrical connection without compromising the sealing of the isostatic chamber, enabling coordinated pressure environment and electrical testing. The structural design is compact and reasonable. The complete solid-state battery charge and discharge testing device integrates pressure application and testing functions, eliminating the need for an additional testing platform, simplifying the testing process, improving testing efficiency, and is applicable to charge and discharge cycle testing of various solid-state batteries, making it highly versatile.

[0056] It should be noted that the electrical testing equipment includes an electrical interface for ensuring the airtightness of the electrode leads, which is a high-pressure sealed connector capable of withstanding a pressure of at least 10 MPa.

[0057] During operation, the solid-state battery sample to be tested is first precisely placed between the first plate 301 and the second plate 302 of the limiting component 3. The maximum distance between the first plate 301 and the second plate 302 is adjusted by the adjusting component to limit the second plate 302, ensuring that the sample is stable and does not shake. Inert gas can uniformly and quickly fill the internal space of the limiting component 3 through the transfer hole, thereby achieving uniform pressurization of the solid-state battery sample in all directions.

[0058] After confirming that all preparations are complete, close the door of the isostatic chamber and check the seal again to ensure the safety and reliability of the experiment.

[0059] Open the valve of the high-purity argon cylinder 201 and slowly adjust it through the precision pressure reducing valve 202 to gradually raise the pressure in the isostatic chamber 1 to the preset value (first threshold). During this process, the reading of the pressure gauge 4 needs to be closely monitored to ensure that the pressure rise is stable and accurate.

[0060] Subsequently, the external battery testing equipment was activated to accurately measure the electrochemical performance of the battery cell under high-voltage conditions. Throughout the experiment, the pressure changes within the containment cavity and the cell's test data needed to be continuously monitored to ensure the accuracy and repeatability of the experimental results.

[0061] Example 3: A method for testing the charge and discharge of a solid-state battery includes the following steps: S1. Position the solid-state battery within the limiting component 3, and connect the pen clip to the positive and negative terminals of the solid-state battery. Specifically, the solid-state battery sample to be tested is installed in the limiting component 3. Then, the fixture with the solid-state battery installed is moved into the receiving cavity. The positive and negative terminals of the solid-state battery and the corresponding pen clips are correctly connected so that the external battery testing equipment can test the electrochemical performance of the solid-state battery normally. Finally, the sealing performance of the receiving cavity is ensured to be good.

[0062] S2. Inert gas is supplied into the receiving cavity through the gas supply component 2 to replace and remove the air in the receiving cavity; Specifically, the process involves gas purging and replacement. Argon cylinder 201 and pressure reducing valve 202 are opened to fill the chamber with argon gas until the pressure reaches 0.5 MPa (the first threshold), thus fully replacing the original air in the chamber. Then, the inlet valve is closed, and switch valve 5 is opened to completely purge the gas from the chamber. This purging process is repeated three times to remove residual oxygen and moisture from the chamber to the maximum extent possible, creating a high-purity inert test atmosphere.

[0063] S3. Close the switch valve 5 and turn on the gas supply component 2 to fill the containment cavity with argon gas until the first threshold is reached, so as to form an isostatic pressure environment in the containment cavity. Specifically, an isostatic pressure is applied, the switching valve 5 is closed, and argon gas is slowly and evenly introduced into the containment cavity through the pressure reducing valve 202, gradually increasing the pressure. Once the pressure sensor indicates that the cavity pressure has reached 5.0 MPa and remains stable, the gas introduction is stopped. This step aims to simulate the isostatic load conditions that solid-state batteries experience in actual operating conditions.

[0064] In this step, by repeatedly introducing and expelling argon gas, the oxygen and water content in the rongnaion can be reduced to below 10 ppm.

[0065] It is important to know that the preset pressure threshold can be adjusted within the range of 0.1MPa to 20MPa.

[0066] S4. Turn on the electrical testing equipment and perform charge-discharge cycle tests on the solid-state battery.

[0067] Specifically, in a stable environment maintaining an isostatic pressure of 5.0 MPa, an external battery testing device was started to perform constant current cycling tests on the solid-state battery sample to examine its charge-discharge characteristics, capacity utilization efficiency, voltage plateau changes, and other key electrochemical behaviors under this pressure condition. S5. Data Acquisition: The battery testing equipment automatically collects and stores multi-dimensional data throughout the entire experimental process, including the voltage-time curve and coulombic efficiency for each charge-discharge cycle, as well as the real-time pressure and temperature parameters within the containment chamber, thereby providing sufficient and accurate experimental basis for subsequent analysis of the impact of pressure and temperature on battery performance.

[0068] Furthermore, between steps S1 and S2, the following steps are also included: The cavity is evacuated using a vacuum pump.

[0069] In the description of this invention, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressurizing mechanism for applying pressure to a solid-state battery, characterized in that, It includes an isostatic pressure chamber (1) and an air supply assembly (2); The isostatic pressure chamber (1) is provided with a cavity for accommodating solid-state batteries; The gas supply assembly (2) is connected to the isostatic pressure chamber (1) and is used to supply inert gas into the isostatic pressure chamber (1).

2. The pressurizing mechanism according to claim 1, characterized in that, The cavity is provided with a limiting component (3) for limiting the solid-state battery.

3. The pressurizing mechanism according to claim 1, characterized in that, The isostatic pressure chamber (1) has an air inlet and an air outlet that are connected to the receiving cavity; The gas supply component (2) is connected to the gas inlet and is used to supply argon gas into the accommodating cavity. A switch valve (5) is provided at the gas outlet.

4. The pressurizing mechanism according to claim 3, characterized in that, The gas supply assembly (2) includes an argon cylinder (201), a first connecting pipe (203), and a pressure reducing valve (202). The outlet end of the argon cylinder (201) is connected to the inlet end of the pressure reducing valve (202), the outlet end of the pressure reducing valve (202) is connected to one end of the first connecting pipe (203), and the other end of the first connecting pipe (203) is connected to the air inlet. The air outlet is equipped with a switch valve (5).

5. The pressurizing mechanism according to claim 2, characterized in that, The limiting component (3) includes a first plate (301), a second plate (302), and an adjusting member; The solid-state battery is placed between the first plate (301) and the second plate (302), and the adjusting member is used to adjust the distance between the first plate (301) and the second plate (302); Both the first plate (301) and the second plate (302) have multiple transmission holes.

6. The pressurizing mechanism according to claim 5, characterized in that, The adjusting component includes a screw (303) and an adjusting nut (304); The screw (303) is connected to the first plate (301), and the second plate (302) has a through hole. The screw (303) passes through the through hole and is screwed to the adjusting nut (304).

7. The pressurizing mechanism according to claim 1, characterized in that, The isostatic pressure chamber (1) is equipped with a pressure gauge (4) for detecting the pressure of the containment chamber. The isostatic pressure chamber (1) includes a chamber body (11) and a door; The cabin (11) and the cabin door are detachably and sealed together.

8. The pressurizing mechanism according to claim 1, characterized in that, The pressurization mechanism also includes an air extraction assembly, which is connected to the isostatic chamber (1) and is used to extract the gas from the isostatic chamber (1).

9. A solid-state battery charge / discharge testing device, characterized in that, The device includes the pressurizing mechanism as described in any one of claims 1-8, and further includes an electrical testing module. The electrical testing module includes two electrode leads, one end of each electrode lead is inserted into the receiving cavity and connected to a pen clip, and the other end is connected to an electrical testing device. The two pen clips are respectively connected to the positive and negative terminals of the solid-state battery.

10. A method for testing the charge and discharge of a solid-state battery, characterized in that, Includes the following steps: S1. The solid-state battery is positioned within the limiting component (3), and the pen clip and the positive and negative terminals of the solid-state battery are connected. S2. Inert gas is supplied into the receiving cavity through the gas supply assembly (2) to replace and remove the air in the receiving cavity; S3. Turn on the gas supply component (2) to fill the cavity with argon gas until the first threshold is reached, so as to form an isostatic pressure environment in the cavity. S4. Turn on the electrical testing equipment and perform charge-discharge cycle tests on the solid-state battery.

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