Solid-state battery testing device with balanced pressurization function

Abstract

The utility model discloses a solid-state battery testing device with a balanced pressurization function. The solid-state battery testing device is used for improving the precision of stacking pressure and the electrochemical performance of a solid-state battery during testing of the solid-state battery. The die comprises an upper cover plate, an upper base plate, an upper pole column plate, an upper pole column, a sealing washer, a pressure stud, a pressure stabilizing column, an upper die shell, a lining, a lower die shell, a solid-state battery, a lower pole column, a lower pole column plate, a pressure sensor, a lower base plate and a lower cover plate. The plurality of voltage stabilizing columns with the same height are uniformly arranged on the upper pole column plate, and the plurality of pressure sensors are correspondingly and uniformly arranged on the lower pole column plate, so that uniform stress in the plane of the solid-state battery in the testing process is ensured, and the performance and the data repeatability of the solid-state battery are improved. In addition, the change condition of the plane internal stress of the solid-state battery can be known according to real-time pressure data. The solid-state battery performance testing device is suitable for performance testing of various solid-state batteries, and has a wide application prospect in solid-state battery research.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid battery test field, especially be used for real -time monitoring and control solid electrolyte test device of pressure exertion. BACKGROUND

[0002] Solid electrolyte material is crucial in the field of batteries, and its performance directly affects the energy density, safety and cycle life of the battery. As a medium for ion transfer and an insulating material for electrons, solid electrolyte is widely used in solid-state batteries, not only improving the safety of the battery, but also avoiding the risk of leakage and combustion that may be caused by liquid electrolyte. However, when testing the performance of solid electrolyte material, the way of applying pressure and the control accuracy can significantly affect the reliability and repeatability of electrochemical test results, and how to uniformly apply pressure becomes a key problem in testing.

[0003] The commonly used test method at present applies pressure by mechanically tightening bolts to ensure sufficient contact between the sample and the electrode. However, this method is prone to uneven pressure on the sample in different areas due to uneven distribution of bolts and difficulty in controlling manual operation. Especially under high pressure conditions, if the tightening force of the bolt is slightly off, it may cause stress concentration, resulting in deviation of test results and inability to accurately reflect the true performance of the material. For example, when the sample is unevenly stressed, the stress difference in different areas will cause errors in ion conductivity measurement, directly affecting the reliability of the test data.

[0004] The performance of solid electrolyte material is highly dependent on external pressure conditions, especially in terms of ion conduction behavior and interface stability. Changes in pressure will change the contact between the electrolyte and the electrode, thereby affecting the interface resistance. However, most existing test equipment lacks real-time pressure monitoring and adjustment functions, and operators can only rely on experience to judge the tightness of the bolts, making it difficult to ensure uniformity of pressure application. This unstable pressure application method not only increases the complexity of operation, but also reduces the repeatability and comparability of test results. Especially in cases where material performance is sensitive to pressure, data fluctuation is large, affecting the reliability of the experiment. "Pressure Effects and Countermeasures in Solid-State Batteries: A Comprehensive Review" points out that traditional test molds cannot accurately control pressure, resulting in large errors in test results, affecting the repeatability and comparability of experimental results. The lack of real-time feedback mechanism in testing makes it difficult to adjust the sample when the pressure is uneven, further increasing the difficulty of operation and the volatility of test data.

[0005] Therefore, it is particularly important to develop a testing device capable of uniform pressure, real-time monitoring, feedback and adjustment functions. The device needs to accurately monitor the stress of the sample during the pressure application process and timely feedback data so that the operator can adjust according to the pressure change to ensure the uniformity and accuracy of the test, effectively reduce the test deviation caused by manual operation error or environmental change, provide reliable data support for the research of ion conduction behavior and interface stability of solid electrolyte materials under different pressure conditions, and promote the further development and optimization of solid-state battery technology. Utility model content

[0006] The utility model provides a kind of solid electrolyte testing device with balanced pressurization function, it can solve the problem of unbalanced pressurization in the test engineering of solid-state battery, i.e.

[0007] The utility model aims to realize by the following technical scheme:

[0008] A kind of solid-state battery testing device with balanced pressurization function, including upper cover plate, upper pad plate, upper pole plate, upper electrode column, sealing washer, pressure stud, pressure stabilizing column, upper die shell, inner lining, lower die shell, solid-state battery, lower electrode column, lower pole plate, pressure sensor, lower pad plate, lower cover plate;The upper cover plate and the lower cover plate are fastened in the upper and lower ends of the upper pole plate and lower pole plate by the pressure stud, the upper pad plate is located between the upper cover plate and upper pole plate, similarly, the lower pad plate is located between the lower cover plate and lower pole plate, for insulation;The upper electrode column and the lower electrode column are respectively located in the center of the upper pole plate and the lower pole plate;The upper die shell and the lower die shell are tightened by thread connection;The inner lining is arranged in the die shell, for placing the solid-state battery;The upper electrode column and the lower electrode column are in close contact with solid-state battery respectively;The upper electrode column and lower electrode column are respectively provided with clamping slot for placing the sealing washer;The solid-state battery is fixed in the inner lining, and is pressurized during testing, the pressure stud is used for pressure maintaining and adjusting the pressure of each point;The pressure stabilizing column is connected with the upper pole plate by thread, and the pressure stabilizing column is in contact with the pressure sensor below;The pressure sensor is arranged in the equal-depth groove of lower pole plate;The pressure sensor is arranged at a certain angle, for monitoring the stress during the pressurization of each position, and adjusting the balance of the pressure of each position by adjusting the bolt on the pressure stud.

[0009] Preferably, the pressure stabilizing column is a rigid rod, and the pressure stabilizing columns are distributed at equal distances and angles.

[0010] Preferably, the pressure stabilizing column is provided with several rods, and the heights are consistent.

[0011] As preferred, the stabilizing column has a diameter of 2-200mm, and the length is configured according to the distance between the upper and lower electrode column plates.

[0012] As preferred, the number of pressure sensors is consistent with the number of stabilizing columns, the positions of the pressure sensors correspond to the positions of the pressure rods, and the heights of the pressure sensors need to be consistent.

[0013] As preferred, the pressure sensor, preferably a small industrial application micro pressure sensor, has a diameter of 1-50mm and a pressure bearing range of 0-1000Mpa, and different pressure range and pressure accuracy sensors can be replaced as needed when performing pressure tests on special samples.

[0014] As preferred, the pressure sensor adopts wireless or wired communication, preferably wireless communication, and displays the pressure reading through an external display.

[0015] As preferred, the bottom surface shape of the upper and lower electrode columns includes but is not limited to circular, square, and polygonal.

[0016] As preferred, the pressure stud is provided with a bolt.

[0017] The solid-state electrolyte testing device with balanced pressurization function of the present application applies the stacking pressure applied by the pressurization device to the stabilizing column through the upper cover plate, and then to the pressure sensor, and adjusts the bolt on the pressure stud to balance the pressure at each position through the display pressure value of the pressure sensor.

[0018] Compared with the prior art, the above technical scheme has the following technical effects:

[0019] 1. High stress uniformity, improving test accuracy: Through the multiple pressure sensors uniformly arranged on the lower base plate, the device can monitor the stress at each position in real time, ensuring that the stress of each part of the solid-state electrolyte sample is uniform during the application of pressure. Experimental data shows that after using the device, the stress deviation of the sample at each point can be controlled within ±5%, significantly improving the accuracy of the test, especially for sensitive tests such as ion conductivity. Compared with traditional molds, the utility model can effectively avoid errors caused by uneven stress, thereby improving the reliability of the overall test results.

[0020] 2. Significantly improve the consistency and repeatability of test results: By monitoring and adjusting the pressure distribution in real time, and visualizing the numerical process of pressure application, the force conditions of each test are ensured to be consistent, thereby improving the repeatability of test results. Experiments show that the data fluctuation of solid-state electrolyte ion conductivity test using the device is less than 3%, while the test result fluctuation of traditional mold is as high as 15%. This significant improvement has important value for laboratory repeated tests and scientific research.

[0021] 3. Facilitate large-scale application and industrialization: The modular design of the device makes it easy to mass-produce and assemble, especially suitable for quality detection in battery manufacturing enterprises. Since the reliability and accuracy of the test results are guaranteed, it can better meet the strict requirements of industrial applications for product consistency and performance, thereby providing support for the popularization and application of solid-state batteries.

[0022] In summary, the utility model realizes the uniformity of stress and data stability in the test process through the innovative pressure monitoring and control function, which has significant technical advantages and practical value compared with the prior art. Not only improves the accuracy and efficiency of solid-state electrolyte test, has wide application prospect and market potential. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the overall structure schematic diagram provided in the embodiment of the utility model;

[0024] Figure 2 is the device explosion schematic diagram provided in the embodiment of the utility model.

[0025] Mark explanation: 1, upper cover plate; 2, upper pad plate; 3, upper pole plate; 4, upper electrode post; 5, sealing washer; 6, pressure stud; 7, pressure stabilizing column; 8, upper mold shell; 9, inner liner; 10, lower mold shell; 11, solid-state battery; 12, lower electrode post; 13, lower pole plate; 14, pressure sensor; 15, lower pad plate; 16, lower cover plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0028] Please refer to Figures 1-2 The present application provides a solid-state battery testing device with balanced pressurization function.

[0029] Reference Figure 1 A solid-state battery testing device with balanced pressurization function, comprising an upper cover plate 1, an upper gasket plate 2, an upper pole plate 3, an upper electrode column 4, a sealing gasket 5, a pressure stud 6, a pressure stabilizing column 7, an upper mold shell 8, an inner liner 9, a lower mold shell 10, a solid-state battery 11, a lower electrode column 12, a lower pole plate 13, a pressure sensor 14, a lower gasket plate 15, and a lower cover plate 16.

[0030] Reference Figure 2 The specific implementation sequence is as follows: first, insert the lower electrode column 12 into the inner liner 9, place the solid-state battery 11 in the inner liner 9, select a suitable length of the pressure stabilizing column 7, tighten it with the upper pole plate through threads, keep the height of the pressure stabilizing column 7 consistent, then place the upper electrode column 4 and the lower electrode column 12 against the solid-state battery 11 respectively, make the pressure stabilizing column 7 exactly abut against the pressure sensor 14, then place the upper gasket plate 2 and the lower gasket plate 15 between the upper cover plate 1 and the upper pole plate 3, and between the lower cover plate 16 and the lower pole plate 13 respectively, then fix the upper cover plate 1 and the lower cover plate 16 through the pressure stud 6, finally, connect the external pressurization device to pressurize the solid-state battery 11, observe the pressure reading through the external display, tighten and adjust the pressure of each position through the bolts on the pressure stud 6, and finally remove the external pressurization device for testing.

[0031] Example 1: Conducting conductivity test on sulfide solid-state electrolyte LPSCl, according to the above implementation sequence, in the test, the initial pressure is 300 MPa, at the beginning of the experiment, there is a difference in the initial readings of each pressure sensor, the operator adjusts the tightening degree of the bolts according to the data feedback by the external display device, until the readings of the three sensors tend to be consistent.

[0032] The final data shows that the readings of all sensors are maintained within the range of 300 MPa±3 MPa, indicating that the uniformity of the stress on the sample is good. Under this condition, the ionic conductivity test is conducted, and the results show that the ionic conductivity of the sample is 4.5×10-3 S / cm, and the data change is less than 1% after repeated testing five times, verifying the effectiveness of the device in improving the consistency of the test results.

[0033] Comparative Example 1: The same solid-state electrolyte was used for ion conductivity testing without pressure balance adjustment. The initial pressure was 300 MPa, and the initial readings of each pressure sensor were different, indicating that the sample had good uniformity of stress. Under this condition, the ion conductivity test was repeated five times, and the data varied by more than 6%, indicating that the battery without pressure balance adjustment had a large difference in test results.

[0034] Example 2: The full solid-state battery was tested, with NCM811 positive electrode, LPSCl electrolyte, and lithium-indium alloy negative electrode. To verify the stress uniformity of the device under high pressure, the target pressure was set to 600 MPa. At the beginning of the experiment, the pressure was applied by the external pressure device, and the sensor data on the display device was monitored in real time. The initial readings of each sensor were between 580 MPa and 640 MPa. By gradually adjusting the bolts, the readings of each sensor were finally adjusted to 600 MPa ± 5 MPa.

[0035] Under this pressure condition, the sample was tested for cycle performance, and the results showed that the solid-state battery still had stable charge and discharge after 300 cycles at 600 MPa, with a capacity retention rate of > 90%. The data was stable and had good repeatability, further verifying the applicability and sample protection ability of the device under high pressure.

[0036] Comparative Example 2: Comparative experiment, the same solid-state battery was used, with NCM811 positive electrode, LPSCl electrolyte, and lithium-indium alloy negative electrode. Without pressure balance adjustment, the readings of each sensor were between 580 MPa and 640 MPa under the same target pressure (600 MPa). After 180 cycles under this condition, the solid-state battery short-circuited.

[0037] The test results showed that the battery with pressure balance adjustment performed better in consistency and accuracy, proving the importance of real-time pressure monitoring and adjustment for improving test quality.

[0038] Through these detailed experimental examples, it can be seen that the test mold of the present application can effectively ensure the uniform stress of the solid-state electrolyte sample during the test process, improve the performance of the solid-state battery, and improve the accuracy and repeatability of the test results, with wide application prospects.

[0039] The embodiments of the present application have been described in detail with reference to the drawings. It should be noted that the implementation manners not shown or described in the drawings or the specification are known to those skilled in the art, and are not described in detail. In addition, the definition of each component described above is not limited to the specific structure, shape or manner mentioned in the embodiments, and those skilled in the art can make simple changes or replacements.

[0040] Those skilled in the art can understand that the features described in various embodiments and / or claims of the present application can be combined or / and combined, even if such combination or combination is not explicitly described in the present application. In particular, the features described in various embodiments and / or claims of the present application can be combined and / or combined without departing from the spirit and teachings of the present application. All these combinations and / or combinations fall within the scope of the present application.

[0041] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A solid-state battery testing device having a balanced pressurization function, comprising: The upper cover plate (1), the upper gasket (2), the upper pole plate (3), the upper electrode column (4), the sealing gasket (5), the pressure stud (6), the pressure stabilizing column (7), the upper mold shell (8), the inner liner (9), the lower mold shell (10), the solid-state battery (11), the lower electrode column (12), the lower pole plate (13), the pressure sensor (14), the lower gasket (15), and the lower cover plate (16) are characterized in that: the upper cover plate (1) and the lower cover plate (16) are fastened at the upper and lower ends of the upper pole plate (3) and the lower pole plate (13) through the pressure stud (6), the upper gasket (2) is arranged between the upper cover plate (1) and the upper pole plate (3), and similarly, the lower gasket (15) is arranged between the lower cover plate (16) and the lower pole plate (13) for insulation; the upper electrode column (4) and the lower electrode column (12) are respectively located at the center of the upper pole plate (3) and the lower pole plate (13); the upper mold shell (8) and the lower mold shell (10) are screwed together; the inner liner (9) is arranged in the mold shell for placing the solid-state battery (11); the upper electrode column (4) and the lower electrode column (12) are in close contact with the solid-state battery (11) respectively; the upper electrode column (4) and the lower electrode column (12) are respectively provided with a clamping groove for placing the sealing gasket (5); the solid-state battery (11) is fixed in the inner liner (9) and is subjected to pressure during the test, and the pressure stud (6) is used for pressure retention and adjustment of the pressure at each point; the pressure stabilizing column (7) is connected with the upper pole plate (3) through threads, and the lower end of the pressure stabilizing column (7) abuts against the pressure sensor (14); the pressure sensor (14) is arranged in the equal-depth groove prearranged in the lower pole plate (13); the pressure sensor (14) is arranged at a certain angle for monitoring the stress condition during the pressure process at each position and adjusting the balance of the pressure at each position by adjusting the bolts on the pressure stud (6).

2. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The pressure stabilizing column (7) is a rigid rod, and the pressure stabilizing columns (7) are equally spaced and angularly distributed.

3. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The pressure stabilizing column (7) is provided with a plurality of rods with consistent heights.

4. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The diameter of the pressure stabilizing column (7) is 2-200 mm, and the length is configured according to the distance between the upper pole plate (3) and the lower pole plate (13).

5. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The number of the pressure sensors (14) is consistent with the number of the pressure stabilizing columns (7), the positions of the pressure sensors correspond to the positions of the pressure rods, and the heights of the pressure sensors (14) need to be consistent.

6. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The diameter of the pressure sensor (14) is 1-50 mm, and the pressure bearing range is 0-1000 Mpa. Different sensors with different pressure ranges and pressure accuracies can be replaced as needed during the pressure test of the sample.

7. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The pressure sensor (14) adopts wireless or wired communication, and the pressure value is displayed through an external display.

8. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The bottom surface shape of the upper electrode column (4) and the lower electrode column (12) includes but is not limited to a circular shape, a square shape, and a polygonal shape.

9. The solid-state battery testing device with a balanced pressurization function according to claim 1, characterized in that: The pressure stud (6) is provided with a bolt.

10. The solid-state battery testing device having a balanced pressurization function according to any one of claims 1 to 8, characterized by, The pressure applied by the pressing device is transmitted through the upper cover plate (1) to the pressure stabilizing column (7) and then to the pressure sensor (14). The pressure value displayed by the pressure sensor (14) is used to adjust the position of the bolt on the pressure screw column (6) to balance the pressure.

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