Battery swelling test device

Abstract

The application relates to a battery expansion testing device, which comprises an environment box, a bearing assembly and a pressure testing module, the environment box is used for simulating the use environment of a battery to be tested; the bearing assembly is located in the environment box and is used for bearing the battery to be tested; one end of the pressure testing module is located in the environment box and is connected with the bearing assembly, the other end extends to the outside of the environment box through the bearing plate and is fixed on the bearing plate, and the pressure testing module is used for providing test pressure to the battery to be tested and detecting the expansion of the battery to be tested according to displacement data fed back by the battery to be tested. The application can make the battery to be tested carry out thickness change amount testing in a full cycle of battery charging and discharging under a condition closer to a real working condition through the environment box simulating the actual use environment of the battery, and the accuracy and reliability of battery thickness and expansion degree measurement are improved, and strong support is provided for comprehensive evaluation of battery performance.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a battery expansion testing device. Background Technology

[0002] Solid-state batteries, with their high energy density and small size, have become one of the important development directions in battery technology. During battery charge-discharge cycles, the periodic changes in electrode thickness directly lead to changes in the overall battery size. As the number of charge-discharge cycles increases, the battery thickness gradually accumulates and increases, resulting in expansion forces that exert increasing pressure on the module structure. When the expansion force exceeds a critical value, it will not only seriously affect the battery's cycle life but may also cause safety hazards such as internal structural deformation and electrode interface failure. Therefore, accurate monitoring of battery thickness and expansion state during cycling is of great significance in the battery design and performance evaluation stages.

[0003] In related technologies, expansion testing instruments have achieved the measurement of thickness changes throughout the entire charge-discharge cycle of a battery. However, they have significant technical shortcomings in practical applications: current testing schemes generally ignore the influence of environmental factors on the measurement results. For example, changes in ambient temperature cause thermal expansion and contraction of the battery's internal materials, which, combined with the electrochemical expansion caused by charge-discharge, creates a superimposed effect, causing the thickness measurement value to deviate from the actual expansion amount. Environmental interference factors can cause the test conclusions to deviate from the actual values, leading to misjudgments in the direction of battery design optimization, resulting in a waste of human and material resources and a reduction in testing efficiency during the research and development process. Summary of the Invention

[0004] Therefore, it is necessary to address the issue that related technologies do not consider the impact of environmental factors on the thickness change measurement results throughout the battery charge and discharge cycle, and to provide a battery expansion testing device that can achieve test conclusions consistent with actual data and improve measurement accuracy.

[0005] According to one aspect of this application, a battery swelling test apparatus is provided, comprising:

[0006] An environmental chamber is used to simulate the operating environment of the battery under test, and a support plate is provided on the top of the environmental chamber;

[0007] A carrier assembly, located inside the environmental chamber and fixed to the carrier plate, is used to support the battery to be tested;

[0008] A pressure testing module is fixed on the support plate, with one end of the pressure testing module extending through the support plate into the environmental chamber and connected to the support assembly. The pressure testing module is configured to provide test pressure to the battery under test and detect the expansion of the battery under test based on the displacement data fed back by the battery under test.

[0009] In one embodiment, the stress testing module includes:

[0010] A pressurizing assembly, the first end of which is fixed to the support plate, and the second end of which extends through the support plate into the interior of the environmental chamber and presses against the battery under test to provide test pressure to the battery under test;

[0011] The detection component has a first end connected to the second ends of both the support component and the pressurizing component. The second end of the detection component extends to the outside of the environmental chamber and is fixed to the support plate. The detection component is used to measure the displacement data of the second ends of the support component and the pressurizing component relative to the support plate, so as to calculate the expansion of the battery under test.

[0012] In one embodiment, the support assembly includes: a first flange cylinder, a connecting plate, and a support platform. The connecting plate is fixed to the support plate via the first flange cylinder. The connecting plate and the support platform are disposed opposite to each other, and the connecting plate and the support platform are fixedly connected by a connecting rod. The connecting plate and the support platform form an accommodating space. The support platform is used to support the battery to be tested.

[0013] In one embodiment, the pressurizing assembly includes: a connecting component, a drive unit, a transmission column, and a first pressure plate.

[0014] The connecting component is disposed outside the environmental enclosure and is used to support the drive unit;

[0015] The first end of the transmission column is used to connect to the output end of the drive unit, and the second end of the transmission column extends through the connecting plate into the receiving space and connects to the first pressure plate. The first pressure plate is used to press on the battery under test. The transmission column and the first pressure plate can move within the receiving space under the action of the drive unit to apply pressure to the battery under test.

[0016] In one embodiment, a second pressure plate corresponding to the first pressure plate is also provided on the support platform, and the battery to be tested is placed on the second pressure plate. Both the first pressure plate and the second pressure plate are ceramic pressure plates.

[0017] In one embodiment, the detection component includes:

[0018] A first displacement detection component, the first end of which is fixed on the support platform, and a second end of a second displacement detection component that extends through the connecting plate and the support plate to the outside of the environmental chamber, are used to detect displacement data of the support platform relative to the support plate.

[0019] The second displacement detection component has its first end fixed to the displacement plate and its second end extending through the connecting plate and the supporting plate to the outside of the environmental chamber, for detecting the displacement data of the displacement plate relative to the supporting plate.

[0020] In one embodiment, a first linear bearing and a second linear bearing are provided between the connecting plate and the bearing plate;

[0021] The first displacement detection component includes: a first displacement rod and a first displacement sensor. The first displacement sensor is fixed on the support platform. The first end of the first displacement rod is fixed on the support platform. The second end of the first displacement rod passes through the connecting plate, the first linear bearing and the support plate in sequence, extends to the outside of the environmental chamber, and abuts against the detection end of the first displacement sensor.

[0022] The second displacement detection component includes a second displacement rod and a second displacement sensor. The second displacement sensor is fixed on the support platform. The first end of the second displacement rod is fixed on the displacement plate. The second end of the second displacement rod passes through the connecting plate, the second linear bearing, and the support plate in sequence, extending to the outside of the environmental chamber and abutting against the detection end of the second displacement sensor.

[0023] In one embodiment, the detection component further includes a drive platform and a fixing plate. The first displacement sensor and the second displacement sensor are fixed to the support plate via the fixing plate. The drive platform is fixed to the support plate, and the output end of the drive platform is connected to the fixing plate to drive the first displacement sensor and the second displacement sensor to move in the vertical direction.

[0024] In one embodiment, the detection component further includes a pressure sensor connected between the output of the drive unit and the transmission column for detecting the expansion force of the battery under test.

[0025] In one embodiment, the environmental chamber is capable of providing temperature regulation from -25°C to 80°C;

[0026] The environmental chamber is equipped with a charging interface, which is connected to an external charging device to charge and discharge the battery under test.

[0027] The aforementioned battery expansion testing device simulates the actual battery usage environment through an environmental chamber, enabling the battery under test to measure the thickness change over the entire charge-discharge cycle under conditions closer to real-world usage. This improves the accuracy and reliability of battery thickness and expansion measurements, providing strong support for comprehensive battery performance evaluation and reducing resource consumption during research and development and production. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a battery expansion testing device provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of a battery expansion testing device provided in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the overall structure of a battery expansion testing device provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Environmental enclosure; 2. Mounting enclosure; 3. Load-bearing components; 4. Pressurization components;

[0033] 10. Support plate; 11. Charging interface;

[0034] 30. Connecting plate; 31. Support platform; 32. Connecting rod; 33. First flange cylinder;

[0035] 40. Second flange cylinder; 41. Drive unit; 42. Transmission column; 43. Tableting assembly;

[0036] 441. Displacement plate; 442. First pressing plate; 443. Second pressing plate;

[0037] 50. Pressure sensor; 51. First displacement rod; 52. Second displacement rod; 53. First displacement sensor; 54. Second displacement sensor; 55. First linear bearing; 56. Second linear bearing; 57. Drive platform; 58. Fixing plate. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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 this application 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 this application.

[0040] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0044] As described in the background section, related expansion testing instruments or testing schemes generally ignore the influence of environmental factors on the measurement results of thickness changes throughout the battery charge and discharge cycle, which leads to deviations between test conclusions and actual values, resulting in misjudgments of battery design optimization directions, waste of human and material resources and reduced testing efficiency during the research and development process.

[0045] Therefore, this application provides a battery expansion testing device that can simulate the actual use environment of the battery, thereby improving the accuracy and reliability of battery thickness and expansion measurement, providing strong support for the comprehensive evaluation of battery performance, and thus reducing resource consumption in the research and development and production process.

[0046] See Figure 1 As shown, Figure 1 A schematic diagram of a battery expansion testing device according to an embodiment of this application is shown. The battery expansion testing device provided in one embodiment of this application includes an environmental chamber 1, a support component 3, and a pressure testing module. The environmental chamber 1 is used to simulate the usage environment of the battery under test, and a support plate 10 is provided on the top of the environmental chamber 1. The support component 3 is disposed inside the environmental chamber 1 and fixed to the support plate 10, and is used to support the battery under test. The pressure testing module is fixed to the support plate 10, and its first end extends through the support plate 10 into the interior of the environmental chamber 1 and is connected to the support component 3, for providing test pressure to the battery under test and detecting the expansion of the battery under test based on the displacement data fed back by the battery under test.

[0047] Specifically, the environmental chamber 1 can simulate the temperature and humidity changes in real-world battery usage scenarios. In this embodiment, the environmental chamber 1 can provide temperature regulation from -25℃ to 80℃. A charging interface 11 is provided on the side wall of the environmental chamber 1. One end of the charging interface 11 is connected to an external charging device, and the other end of the charging interface 11 is connected to the battery under test placed inside the environmental chamber 1 for charging and discharging the battery under test.

[0048] This application uses an environmental chamber 1 to simulate the actual use environment of the battery, enabling the test battery to measure the thickness change during the entire charge-discharge cycle under conditions closer to real-world operating conditions. This improves the accuracy and reliability of battery thickness and expansion measurement, provides strong support for the comprehensive evaluation of battery performance, and reduces resource consumption during research and development and production.

[0049] Continue reading Figure 1 The support assembly 3 includes a first flange cylinder 33, a connecting plate 30, and a support platform 31. The connecting plate 30 is fixed to the support plate 10 via the first flange cylinder 33, and the support platform 31 is used to support the battery to be tested. The dimensions of the connecting plate 30 and the support platform 31 are basically the same, while the dimensions of the support platform 31 are larger than the dimensions of the battery to be tested. The connecting plate 30 and the support platform 31 are arranged opposite to each other and are rigidly fixedly connected by several connecting rods 32, so that a receiving space is formed between the connecting plate 30 and the support platform 31. Furthermore, in order to facilitate the pressurizing assembly 4 to apply test pressure to the battery to be tested through the receiving space, the connecting plate 30 is provided with a connecting hole (not shown in the figure).

[0050] It is worth noting that the support component 3 will expand or contract with the temperature change inside the environmental chamber 1, and the upper surface of the support platform 31 will have a certain displacement in the vertical direction, that is, the support platform 31 will be displaced relative to the support plate 10.

[0051] The pressure testing module includes a pressurizing component 4 and a detection component. The first end of the pressurizing component 4 is fixed to the support plate 10, and the second end of the pressurizing component 4 passes through a connecting hole on the support plate 10 and the connecting plate 30, extending into the receiving space of the support component 3, and presses against the battery under test to provide test pressure. The first end of the detection component is connected to both the support component 3 and the second end of the pressurizing component 4. The second end of the detection component extends to the outside of the environmental chamber 1 and is fixed to the support plate 10. The detection component measures the displacement data of the support component 3 relative to the support plate 10, and the displacement data of the second end of the pressurizing component 4 relative to the support plate 10, to calculate the expansion of the battery under test in a simulated environment.

[0052] During testing, the battery under test is placed on the support platform 31, and the second end of the pressurizing component 4 presses against the battery to apply test pressure, simulating the pre-tightening force conditions after the battery is assembled into a module. During the test, the expansion force generated by the battery under test acts on the second end of the pressurizing component 4, causing it to move vertically and displace relative to the support plate 10. Since the support component 3 expands or contracts with temperature changes within the environmental chamber 1, the displacement data of the second end of the pressurizing component 4 relative to the support plate 10 detected by the testing component includes both the displacement of the second end of the pressurizing component 4 under the expansion force of the battery under test and the displacement caused by the expansion or contraction of the support component 3. Therefore, the actual expansion thickness of the battery under test is equal to the displacement data of the second end of the pressurizing component 4 relative to the support plate 10 minus the displacement data of the support component 3 relative to the support plate 10.

[0053] Furthermore, such as Figure 1 As shown, the pressurizing assembly 4 includes a connecting component, a drive unit 41, a transmission column 42, and a first pressure plate 442.

[0054] The connecting component is a second flange cylinder 40, which is located outside the environmental chamber 1 and fixed to the support plate 10. The first flange cylinder 33 is opposite to and coaxially arranged with the second flange cylinder 40, allowing the internal space of the second flange cylinder 40 to communicate with the internal space of the first flange cylinder 33. Both the first flange cylinder 33 and the second flange cylinder 40 include a flange and a sleeve, which are detachably installed. By fixing the flange to the support plate 10 and then installing the sleeve on the flange, either the first flange cylinder 33 or the second flange cylinder 40 can be fixed to the support plate 10. The drive unit 41 is fixed to the second flange cylinder 40, which primarily provides upward support to the drive unit 41.

[0055] The drive unit 41 is fixed to the second flange cylinder 40, and its output end is located inside the second flange cylinder 40, allowing it to move vertically within the cylinder. The first end of the transmission column 42 is fixed to the output end of the drive unit 41, and its second end extends through a connecting hole into the receiving space. Under the action of the drive unit 41, the transmission column 42 can move vertically within the receiving space. The first pressure plate 442 is fixedly connected to the second end of the transmission column 42, and the pressure plate component 43 follows the transmission column 42 in moving vertically within the receiving space, thereby applying test pressure to the battery under test.

[0056] Specifically, during testing, the drive unit 41 drives the transmission column 42 downwards. The second end of the transmission column 42 moves the first pressure plate 442 downwards, thereby compressing the battery to be tested placed on the support platform 31, simulating the pre-tightening force conditions after the battery is assembled into a module. After the test is completed, the drive unit 41 drives the transmission column 42 upwards. The transmission column 42 moves the first pressure plate 442 upwards, away from the support platform 31, at which point the battery to be tested can be removed or replaced. In this embodiment, the drive unit 41 is a cylinder. During the test, the pressure plate component 43 applies a pressure of 10 MPa to the battery to be tested.

[0057] Furthermore, in order to improve the uniformity of pressure applied to the battery under test, such as Figure 2 As shown, a second pressure plate 443 corresponding to the first pressure plate 442 is also provided on the support platform. The battery to be tested is placed on the second pressure plate 443. Both the first and second pressure plates are ceramic pressure plates. Ceramic pressure plates have good heat preservation performance. When the ceramic pressure plate is pressed on the battery, it can prevent the battery's self-generated heat from dissipating rapidly. It can detect the impact of the battery's self-generated heat on its performance under pressure and can accurately simulate the actual use of the battery.

[0058] Continue reading Figure 2 The system includes a first displacement detection component and a second displacement detection component. A pressure sensor 50 is located between the output end of the drive unit 41 and the transmission column 42. The first end of the first displacement detection component is fixed to the support platform 31, and the second end of the first displacement detection component extends through the connecting plate 30 and the support plate 10 to the outside of the environmental chamber 1, used to detect the displacement data of the support platform 31 relative to the support plate 10. The first end of the second displacement detection component is fixed to a displacement plate 441, and the second end of the second detection component extends through the connecting plate 30 and the support plate 10 to the outside of the environmental chamber 1, used to detect the displacement data of the displacement plate 441 relative to the support plate 10.

[0059] Specifically, the first displacement detection component includes a first displacement rod 51 and a first displacement sensor 53. The first displacement sensor 53 is located outside the environmental chamber 1 and fixed to the support plate 10. The first end of the first displacement rod 51 is fixed to the support platform 31, and the second end of the first displacement rod 51 extends through the connecting plate 30 and the support plate 10 to the outside of the environmental chamber 1, abutting against the detection end of the first displacement sensor 53. The first displacement rod 51 is used to transmit the displacement of the support platform 31 relative to the support plate 10, and the first sensor is used to detect the displacement data of the support platform 31 relative to the support plate 10. Similarly, the second displacement monitoring component includes a second displacement rod 52 and a second displacement sensor 54. The second displacement sensor 54 is located outside the environmental chamber 1 and fixed to the support plate 10. The first end of the second displacement rod 52 is fixed to the displacement plate 441, and the second end of the second displacement rod 52 extends through the connecting plate 30 and the support plate 10 to the outside of the environmental chamber 1, abutting against the detection end of the second displacement sensor 54. The second displacement rod 52 is used to transmit the displacement of the displacement plate 441 relative to the support plate 10, and the second sensor is used to detect the displacement data of the displacement plate 441 relative to the support plate 10.

[0060] Furthermore, to ensure stable movement of the first displacement rod 51 and the second displacement rod 52, reduce frictional resistance, and improve detection accuracy, a first linear bearing 55 and a second linear bearing 56 are respectively installed between the connecting plate 30 and the bearing plate 10. The central axes of the first linear bearing 55 and the second linear bearing 56 are perpendicular to the reference plane of the connecting plate 30 or the bearing plate 10, respectively. After the second end of the first displacement rod 51 passes through the connecting plate 30, its movement direction is constrained by the first linear bearing 55, and then it extends through the bearing plate 10 to the outside of the environmental chamber 1. Similarly, the second end of the second displacement rod 52 passes through the connecting plate 30, the second linear bearing 56, and the bearing plate 10 in sequence to extend to the outside of the environmental chamber 1. Likewise, after the second end of the second displacement rod 52 passes through the connecting plate 30, its movement direction is constrained by the second linear bearing 56, and then it extends through the bearing plate 10 to the outside of the environmental chamber 1.

[0061] See Figure 2 The detection component also includes a pressure sensor 50, which is set between the transmission column 42 and the output end of the drive unit 41 to detect the expansion force generated by the battery under test.

[0062] Continue reading Figure 2The detection assembly also includes a drive platform 57 and a fixing plate 58. The drive platform 57 is fixed on the support plate 10, and the first displacement sensor 53 and the second displacement sensor 54 are fixed on the fixing plate 58. The fixing plate 58 is fixed to the output end of the drive platform 57. The drive platform 57 is used to drive the fixing plate 58 to move in the vertical direction, thereby driving the first displacement sensor 53 and the second displacement sensor 54 to move in the vertical direction, so as to adjust the contact position between the first displacement sensor 53 and the first displacement rod 51, or adjust the contact position between the second displacement sensor 54 and the second displacement rod 52, so as to ensure that the first displacement sensor 53 or the second displacement sensor 54 can completely cover the movement trajectory of the first displacement rod 51 or the second displacement rod 52, and avoid the loss of measurement data due to insufficient range.

[0063] like Figure 3 As shown, the battery expansion testing device provided in one embodiment of this application also includes a mounting box 2, which is fixed on the top of the environmental chamber 1 and is used to accommodate the pressurization component 4 and the components of the detection component that extend to the outside of the environmental chamber 1 or are fixed on the support plate 10, so as to avoid these components being directly exposed to the external environment and to achieve centralized protection of these components.

[0064] The working principle of the battery expansion testing device provided in one embodiment of this application is as follows:

[0065] The battery under test is placed on the second pressure plate 443. The drive unit 41 drives the transmission column 42 to move downwards. The transmission column 42 drives the displacement plate 441 and the first pressure plate 442 to move downwards to press the battery under test. At this time, the pressure sensor 50, the first displacement sensor 53, and the second displacement sensor 54 are reset or zeroed. Then, the thickness change of the battery under test throughout the entire charge and discharge cycle is tested. After the test, the values ​​of the pressure sensor 50, the first displacement sensor 53, and the second displacement sensor 54 are recorded. The value of the pressure sensor 50 is the expansion force generated by the battery under test. The value of the first displacement sensor 53 is the displacement data of the support platform 31 relative to the support plate 10. The value of the second displacement sensor 54 is the data of the displacement plate 441 relative to the support plate 10. The value of the second displacement sensor 54 minus the value of the first displacement sensor 53 is the expansion thickness of the battery under test in the simulated environment. After the test, the drive unit 41 drives the transmission column 42 to move upwards. The transmission column 42 drives the first pressure plate 442 to move upwards. At this time, the battery under test is removed or replaced.

[0066] The aforementioned battery expansion testing device simulates the actual battery usage environment through an environmental chamber, enabling the battery under test to measure the thickness change over the entire charge-discharge cycle under conditions closer to real-world usage. This improves the accuracy and reliability of battery thickness and expansion measurements, providing strong support for comprehensive battery performance evaluation and reducing resource consumption during research and development and production.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery expansion testing device, characterized in that, include: An environmental chamber is used to simulate the operating environment of the battery under test, and a support plate is provided on the top of the environmental chamber; A carrier assembly, located inside the environmental chamber and fixed to the carrier plate, is used to support the battery to be tested; A pressure testing module is fixed on the support plate, with one end of the pressure testing module extending through the support plate into the environmental chamber and connected to the support assembly. The pressure testing module is configured to provide test pressure to the battery under test and detect the expansion of the battery under test based on the displacement data fed back by the battery under test.

2. The battery expansion testing device according to claim 1, characterized in that, The stress testing module includes: A pressurizing assembly, the first end of which is fixed to the support plate, and the second end of which extends through the support plate into the interior of the environmental chamber and presses against the battery under test to provide test pressure to the battery under test; The detection component has a first end connected to the second ends of both the support component and the pressurizing component. The second end of the detection component extends to the outside of the environmental chamber and is fixed to the support plate. The detection component is used to measure the displacement data of the second ends of the support component and the pressurizing component relative to the support plate, so as to calculate the expansion of the battery under test.

3. The battery expansion testing device according to claim 2, characterized in that, The supporting assembly includes: a first flange cylinder, a connecting plate, and a supporting platform. The connecting plate is fixed to the supporting plate through the first flange cylinder. The connecting plate and the supporting platform are arranged opposite to each other, and the connecting plate and the supporting platform are fixedly connected by a connecting rod. The connecting plate and the supporting platform form an accommodating space. The supporting platform is used to support the battery to be tested.

4. The battery expansion testing device according to claim 3, characterized in that, The pressurization assembly includes: a connecting component, a drive unit, a transmission column, and a first pressure plate. The connecting component is disposed outside the environmental enclosure and is used to support the drive unit; The first end of the transmission column is used to connect to the output end of the drive unit, and the second end of the transmission column extends through the connecting plate into the receiving space and connects to the first pressure plate. The first pressure plate is used to press on the battery under test. The transmission column and the first pressure plate can move within the receiving space under the action of the drive unit to apply pressure to the battery under test.

5. The battery expansion testing device according to claim 4, characterized in that, The support platform is also provided with a second pressing plate corresponding to the first pressing plate, and the battery to be tested is placed on the second pressing plate. Both the first pressing plate and the second pressing plate are ceramic pressing plates.

6. The battery expansion testing device according to claim 5, characterized in that, The detection component includes: A first displacement detection component has a first end fixed to the support platform and a second end extending through the connecting plate and the support plate to the outside of the environmental chamber, for detecting displacement data of the support platform relative to the support plate. The second displacement detection component has its first end fixed to the displacement plate and its second end extending through the connecting plate and the supporting plate to the outside of the environmental chamber, for detecting the displacement data of the displacement plate relative to the supporting plate.

7. The battery expansion testing device according to claim 6, characterized in that, A first linear bearing and a second linear bearing are provided between the connecting plate and the bearing plate; The first displacement detection component includes: a first displacement rod and a first displacement sensor. The first displacement sensor is fixed on the support platform. The first end of the first displacement rod is fixed on the support platform. The second end of the first displacement rod passes through the connecting plate, the first linear bearing and the support plate in sequence, extends to the outside of the environmental chamber, and abuts against the detection end of the first displacement sensor. The second displacement detection component includes a second displacement rod and a second displacement sensor. The second displacement sensor is fixed on the support platform. The first end of the second displacement rod is fixed on the displacement plate. The second end of the second displacement rod passes through the connecting plate, the second linear bearing, and the support plate in sequence, extending to the outside of the environmental chamber and abutting against the detection end of the second displacement sensor.

8. The battery expansion testing device according to claim 7, characterized in that, The detection assembly further includes a drive platform and a fixing plate. The first displacement sensor and the second displacement sensor are fixed on the support plate via the fixing plate. The drive platform is fixed on the support plate. The output end of the drive platform is connected to the fixing plate and is used to drive the first displacement sensor and the second displacement sensor to move in the vertical direction.

9. The battery expansion testing device according to claim 6, characterized in that, The detection component also includes a pressure sensor connected between the output end of the drive unit and the transmission column, used to detect the expansion force of the battery under test.

10. The battery expansion testing device according to claim 1, characterized in that, The environmental chamber can provide temperature regulation from -25℃ to 80℃; The environmental chamber is equipped with a charging interface, which is connected to an external charging device to charge and discharge the battery under test.

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