Lithium ion battery in-situ expansion testing device

Abstract

The utility model discloses an in-situ expansion testing device for a lithium ion battery. The testing device comprises a clamping assembly and a detection assembly. The detection assembly comprises a fluid storage cavity and a fluid pressure test cavity connected with the fluid storage cavity. And a fluid pressure sensor is arranged in the fluid pressure testing cavity. The fluid pressure testing cavity comprises a first cavity body, a second cavity body and a first conduction valve. The detection assembly has a first working mode and a second working mode. In the first working mode, the first conduction valve is closed, and the fluid pressure sensor detects the expansion condition of the lithium ion battery by detecting the pressure change of fluid in the first cavity. And in the second working mode, the first conduction valve is opened to enable the first cavity to be communicated with the second cavity, and the fluid pressure sensor detects the expansion condition of the lithium ion battery by detecting the pressure change of fluid in the first cavity and the second cavity. By arranging the first cavity, the second cavity and the first conduction valve, the detection assembly can have different working modes to adapt to different test condition requirements.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion battery testing, and in particular to an in-situ expansion testing device for lithium-ion batteries. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and are widely used in new energy power and energy storage equipment.

[0003] During use, lithium-ion batteries generate internal gas due to repeated charge and discharge cycles, which causes the volume of the lithium-ion battery to expand and exert a certain external expansion force. Therefore, it is particularly important to test the expansion of lithium-ion batteries.

[0004] Commonly used lithium-ion battery expansion measurement devices typically use pressure sensors to measure the battery's expansion deformation. However, the pressure sensor is relatively close to the battery, making it susceptible to damage if the battery experiences an abnormality during testing. Furthermore, these common lithium-ion battery expansion measurement devices are unable to adapt to the diverse testing requirements of lithium-ion batteries of varying sizes. Utility Model Content

[0005] The main purpose of the present application is to provide an in-situ expansion test device for lithium-ion batteries to solve the problems in the prior art that the pressure sensor in the lithium-ion battery expansion test device is easily damaged and cannot adapt to the testing requirements of lithium-ion batteries of different sizes.

[0006] One embodiment of the present application provides an in-situ expansion testing device for a lithium-ion battery, comprising a clamping assembly and a detection assembly, wherein the lithium-ion battery is disposed in the clamping assembly, and the detection assembly is used to detect expansion data of the lithium-ion battery;

[0007] The detection assembly includes a fluid storage chamber and a fluid pressure testing chamber connected to the fluid storage chamber, wherein the fluid storage chamber directly or indirectly abuts against the lithium-ion battery and changes in volume as the lithium-ion battery expands, and a fluid pressure sensor is disposed in the fluid pressure testing chamber;

[0008] The fluid pressure test chamber includes a first cavity, a second cavity, and a first conduction valve connected between the first cavity and the second cavity. The fluid pressure sensor is disposed in the first cavity. The detection component has a first working mode and a second working mode.

[0009] In a first working mode, the first conduction valve is closed, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity;

[0010] In the second working mode, the first conduction valve is opened to connect the first cavity and the second cavity, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting the change in fluid pressure in the first cavity and the second cavity.

[0011] In one embodiment, the volume of the second cavity is greater than the volume of the first cavity.

[0012] In one embodiment, the volume of the second cavity is twice or more than twice the volume of the first cavity.

[0013] In one embodiment, the fluid pressure test chamber further includes a third chamber and a second conduction valve;

[0014] The second conduction valve is connected between the second cavity and the third cavity, and the detection component further includes a third working mode;

[0015] In the third operating mode, the first conduction valve and the second conduction valve are opened simultaneously to connect the first cavity, the second cavity, and the third cavity, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity, the second cavity, and the third cavity.

[0016] In one embodiment, the fluid pressure test chamber further includes a third conduction valve;

[0017] The third conducting valve is connected between the first cavity and the third cavity, and the detection component further includes a fourth working mode;

[0018] In a fourth operating mode, the first conduction valve and the second conduction valve are closed simultaneously, and the third conduction valve is opened to connect the first cavity and the third cavity. The fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity and the third cavity.

[0019] In one embodiment, the volume of the third cavity is greater than the volume of the second cavity.

[0020] In one embodiment, the volume of the third cavity is twice or more than twice the volume of the second cavity.

[0021] In one embodiment, the detection assembly includes a first tube body and a second tube body;

[0022] The first cavity and the fluid pressure sensor are arranged on the first tube;

[0023] The second cavity is arranged on the second tube;

[0024] A first conducting member is connected between the first tube body and the second tube body. A first fluid channel is formed inside the first conducting member to connect the first cavity and the second cavity. The first conducting valve is arranged in the first fluid channel of the first conducting member.

[0025] In one embodiment, the detection assembly further includes a third tube;

[0026] The third cavity is arranged on the third tube;

[0027] A second conducting member is connected between the second tube body and the third tube body. A second fluid channel is formed inside the second conducting member to connect the second cavity and the third cavity. The second conducting valve is provided in the second fluid channel of the second conducting member.

[0028] In one embodiment, the detection component further includes a third conductive member;

[0029] The third conducting member is disposed between the third tube body and the first tube body. A third fluid channel is formed inside the third conducting member to connect the first cavity and the third cavity. The third conducting valve is disposed in the third fluid channel of the third conducting member.

[0030] In the lithium-ion battery in-situ expansion testing device provided herein, a fluid storage chamber and a fluid pressure testing chamber connected to the fluid storage chamber are provided, and a fluid pressure sensor is installed within the fluid pressure testing chamber. Because the fluid pressure sensor is not in direct contact with the lithium-ion battery, damage to the fluid pressure sensor, which could occur if the lithium-ion battery overheats, catches fire, or even explodes during testing, is avoided. Furthermore, the fluid pressure testing chamber is configured to include a first chamber, a second chamber, and a first conduction valve connected between the first and second chambers. In this case, the detection assembly has two operating modes. In the first operating mode, the first conduction valve is closed, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure within the first chamber. In the second operating mode, the first conduction valve is opened, connecting the first and second chambers, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure within the first and second chambers. By configuring the detection assembly with two operating modes, the detection assembly can adapt to different testing requirements. For example, for smaller lithium-ion batteries, the first conduction valve can be closed, placing the detection assembly in a first operating mode. In this operating mode, due to the small volume of the first cavity, when the lithium-ion battery expands, its thickness changes slightly. Fluid transferred from the first cylinder into the first cavity will cause a significant change in the fluid pressure within the first cavity, thereby ensuring the accuracy of the detection results. For larger lithium-ion batteries, the first conduction valve can be opened, placing the detection assembly in a second operating mode. In this operating mode, due to the larger combined volume of the first and second cavities, even if the lithium-ion battery undergoes significant expansion deformation, the combined volume of the first and second cavities can still accommodate the fluid transferred from the first cylinder. This prevents the detection assembly from experiencing excessive pressure buildup due to the large flow of transferred fluid, thus preventing damage to the detection assembly due to excessive pressure buildup. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 A three-dimensional diagram of an in-situ expansion testing device for lithium-ion batteries disclosed in one embodiment of the present application;

[0033] Figure 2 for Figure 1 A side view of the in-situ expansion test apparatus for lithium-ion batteries;

[0034] Figure 3 for Figure 1 A top view of the in-situ expansion test apparatus for lithium-ion batteries;

[0035] Figure 4 for Figure 3 A cross-sectional view of the lithium-ion battery in-situ expansion test device along the AA direction;

[0036] Figure 5 for Figure 4 A structural diagram of the first conduction valve when it is opened;

[0037] Figure 6 A cross-sectional view of an in-situ expansion testing device for a lithium-ion battery disclosed in another embodiment of the present application;

[0038] Figure 7 for Figure 6 A schematic structural diagram of the first conduction valve and the second conduction valve when they are opened;

[0039] Figure 8 A cross-sectional view of an in-situ expansion testing device for a lithium-ion battery disclosed in yet another embodiment of the present application;

[0040] Figure 9 for Figure 8 Schematic diagram of the structure when the first conduction valve and the second conduction valve are closed and the third conduction valve is opened. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] The foregoing is considered as illustrative only of the principles of the application. Other variations and modifications are possible in light of the above teachings. Therefore, the scope of the application is not intended to be limited to the particular embodiments described, but is to be accorded the broadest scope consistent with the scope of the claims. Without intent to limit the scope of the application, exemplary embodiments of the application are set forth below. It is, however, contemplated that other embodiments might fall within the scope of the application. To facilitate an understanding of this application, a number of terms are defined below. Main parts shown in the drawings are not necessarily to scale, with emphasis shown on illustrating the principles of the application. The skilled artisan will understand that the drawings are not intended to limit the scope of this application, which is limited only by the claims set forth below. In the drawings:

[0044] Reference will now be made to Figures 1 to 5 One of the embodiments of the present application provides a lithium ion battery in-situ expansion testing device 100. The lithium ion battery in-situ expansion testing device 100 comprises a clamping assembly 110 and a detection assembly 120. A lithium ion battery is arranged in the clamping assembly 110, and the detection assembly 120 is used to detect the expansion data of the lithium ion battery. In this embodiment, the lithium ion battery in-situ expansion testing device 100 can perform thickness testing, expansion testing, pressure testing, etc. on the lithium ion battery.

[0045] The detection assembly 120 includes a fluid storage chamber 121 and a fluid pressure testing chamber 122 connected to the fluid storage chamber 121. The fluid storage chamber 121 directly or indirectly abuts the lithium-ion battery and changes volume as the lithium-ion battery expands, thereby transferring fluid from the fluid storage chamber 121 to the fluid pressure testing chamber 122. In this embodiment, the fluid storage chamber 121 includes a first cylinder 1211 and a first telescopic rod 1212 extending downward from the first cylinder 1211. The first telescopic rod 1212 directly or indirectly abuts the lithium-ion battery and contracts as the lithium-ion battery expands. A fluid pressure sensor 1221 is disposed within the fluid pressure testing chamber 122. In this embodiment, the fluid pressure sensor 1221 can be either a gas pressure sensor or a liquid pressure sensor. When the fluid pressure testing chamber 122 is filled with gas, the fluid pressure sensor 1221 is a gas pressure sensor to detect the air pressure within the fluid pressure testing chamber 122. When the fluid pressure testing chamber 122 is filled with liquid, the fluid pressure sensor 1221 is a liquid pressure sensor to detect the liquid pressure in the fluid pressure testing chamber 122. It is understood that the fluid storage chamber 121 may also simply be an airbag or liquid bag structure. When the lithium-ion battery expands, it squeezes the fluid storage chamber 121, similarly transferring the fluid in the fluid storage chamber 121 to the fluid pressure testing chamber 122.

[0046] The fluid pressure test chamber 122 includes a first cavity 1222, a second cavity 1223, and a first conduction valve 1224 connected between the first cavity 1222 and the second cavity 1223. The fluid pressure sensor 1221 is disposed in the first cavity 1222. The detection assembly 120 has a first operating mode and a second operating mode.

[0047] In the first working mode, the first conduction valve 1224 is closed, and the fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by detecting the change in fluid pressure in the first cavity 1222 .

[0048] In the second working mode, the first conduction valve 1224 is opened to connect the first cavity 1222 and the second cavity 1223 , and the fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by detecting the change in fluid pressure in the first cavity 1222 and the second cavity 1223 .

[0049] In this embodiment, the fluid may be gas or liquid, as long as it can be transferred between the first cylinder 1211 and the fluid pressure testing chamber 122 under pressure.

[0050] In the lithium-ion battery in-situ expansion testing device 100 provided herein, a fluid storage chamber 121 and a fluid pressure testing chamber 122 connected to the fluid storage chamber 121 are provided. A fluid pressure sensor 1221 is disposed within the fluid pressure testing chamber 122. Because the fluid pressure sensor 1221 is not in direct contact with the lithium-ion battery, damage to the fluid pressure sensor 1221, which could occur during testing due to heating, fire, or even explosion, is avoided. Furthermore, the fluid pressure testing chamber 122 comprises a first cavity 1222, a second cavity 1223, and a first conduction valve 1224 connected between the first and second cavities 1222, 1223. In this configuration, the detection assembly 120 has two operating modes. In the first operating mode, the first conduction valve 1224 is closed, and the fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by monitoring changes in the fluid pressure within the first cavity 1222. In the second operating mode, the first conduction valve 1223 is opened to connect the first and second cavities 1222, 1223. The fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by monitoring changes in the fluid pressure within the first and second cavities 1222, 1223. By configuring the detection assembly 120 to have two operating modes, the detection assembly 120 can adapt to different testing requirements. For example, for smaller lithium-ion batteries, the first conduction valve 1224 can be closed, placing the detection assembly 120 in the first operating mode. In this operating mode, due to the small size of the first cavity 1222, when the lithium-ion battery expands, its thickness undergoes relatively subtle changes. Fluid transferred from the first cylinder to the first cavity 1222 will cause a significant change in the fluid pressure within the first cavity 1222, thus ensuring the accuracy of the test results. For larger lithium-ion batteries, the first conduction valve 1224 can be opened, placing the detection assembly 120 in the second operating mode. In this working mode, since the combined volume of the first cavity 1222 and the second cavity 1223 is relatively large, even if the lithium-ion battery undergoes a large expansion deformation, the combined volume of the first cavity 1222 and the second cavity 1223 can still accommodate the fluid transferred from the first cylinder 1211, so that the detection component 120 will not suffer from excessive pressure in the cavity due to the large flow rate of the transferred fluid, thereby avoiding damage to the detection component 120 due to excessive pressure in the cavity.

[0051] In one embodiment, the volume of the second cavity 1223 is greater than the volume of the first cavity 1222. Preferably, the volume of the second cavity 1223 is twice or more than the volume of the first cavity 1222.

[0052] In this embodiment, by setting the volume of the second cavity 1223 to be larger than the volume of the first cavity 1222, when the first conduction valve 1223 is opened, connecting the first and second cavities 1222, 1223, the combined volume of the first and second cavities 1222, 1223 is at least twice the volume of the first cavity 1222. This allows the detection assembly 120 to better adapt to the expansion detection of large lithium-ion batteries. Preferably, by setting the volume of the second cavity 1223 to be twice or more than the volume of the first cavity 1222, when the first conduction valve 1223 is opened, connecting the first and second cavities 1222, 1223, the combined volume of the first and second cavities 1222, 1223 is at least three times the volume of the first cavity 1222. This also allows the detection assembly 120 to better adapt to the expansion detection of large lithium-ion batteries.

[0053] See Figures 6 and 7 In one embodiment, the fluid pressure testing chamber 122 further includes a third chamber 1225 and a second conducting valve 1226 .

[0054] The second conduction valve 1226 is connected between the second cavity 1223 and the third cavity 1225. The detection component further includes a third working mode.

[0055] In the third operating mode, the first conduction valve 1224 and the second conduction valve 1226 are simultaneously opened to allow communication between the first cavity 1222, the second cavity 1223, and the third cavity 1225. The fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity 1222, the second cavity 1223, and the third cavity 1225.

[0056] In this embodiment, by configuring the fluid pressure test chamber 122 to include a third chamber 1225 and a second conduction valve 1226, the detection assembly 120 has three operating modes to accommodate different testing requirements. As previously described, for smaller lithium-ion batteries, the first conduction valve 1224 can be closed, placing the detection assembly 120 in the first operating mode. In this operating mode, due to the small volume of the first chamber 1222, when the lithium-ion battery expands, its thickness undergoes relatively subtle changes. Fluid transferred from the first cylinder to the first chamber 1222 will cause a significant change in the fluid pressure within the first chamber 1222, thereby ensuring the accuracy of the test results. For larger lithium-ion batteries, the first conduction valve 1224 can be opened, placing the detection assembly 120 in the second operating mode. In this operating mode, because the combined volume of the first and second cavities 1222, 1223 is relatively large, even if the lithium-ion battery undergoes significant expansion deformation, the combined volume of the first and second cavities 1222, 1223 can still accommodate the fluid transferred from the first cylinder 1211. This prevents the detection assembly 120 from experiencing excessive pressure buildup due to the large flow of transferred fluid, thereby preventing damage to the detection assembly 120 caused by excessive pressure buildup. If the volume of the lithium-ion battery continues to increase, the first and second conduction valves 1224, 1226 can be opened simultaneously, placing the detection assembly 120 in the third operating mode. In this working mode, since the combined volume of the first cavity 1222, the second cavity 1223 and the third cavity 1225 is relatively large, even if the lithium-ion battery undergoes a large expansion deformation, the combined volume of the first cavity 1222, the second cavity 1223 and the third cavity 1225 can still accommodate the fluid transferred from the first cylinder 1211, so that the detection component 120 will not suffer from excessive pressure in the cavity due to the large flow rate of the transferred fluid, thereby avoiding damage to the detection component 120 due to excessive pressure in the cavity.

[0057] In one embodiment, the volume of the third cavity 1225 is greater than the volume of the second cavity 1223. Preferably, the volume of the third cavity 1225 is twice or more than the volume of the second cavity 1223.

[0058] In this embodiment, by setting the volume of the third cavity 1225 to be larger than the volume of the second cavity 1223, when the first conduction valve 1223 and the second conduction valve 1226 are opened simultaneously to connect the first cavity 1222, the second cavity 1223, and the third cavity 1225, the sum of the volumes of the first cavity 1222, the second cavity 1223, and the third cavity 1225 will be more than three times the volume of the first cavity 1222, thereby enabling the detection assembly 120 to better adapt to the expansion detection of large-volume lithium-ion batteries. Preferably, when the volume of the third cavity 1225 is set to be twice or more than the volume of the second cavity 1223, and the volume of the second cavity 1223 is twice or more than the volume of the first cavity 1222, when the first conduction valve 1223 and the second conduction valve 1226 are simultaneously opened to connect the first cavity 1222, the second cavity 1223, and the third cavity 1225, the sum of the volumes of the first cavity 1222, the second cavity 1223, and the third cavity 1225 will be more than 7 times the volume of the first cavity 1222. In this case, the detection assembly 120 can also better adapt to the expansion detection of large lithium-ion batteries.

[0059] See Figures 8 and 9 In one embodiment, the fluid pressure testing chamber 122 further includes a third conducting valve 1227 .

[0060] The third conducting valve 1227 is connected between the first cavity 1222 and the third cavity 1225. The detection assembly 120 also includes a fourth working mode.

[0061] In the fourth operating mode, the first conduction valve 1224 and the second conduction valve 1226 are closed at the same time, and the third conduction valve 1227 is opened to connect the first cavity 1222 and the third cavity 1226. The fluid pressure sensor 1221 detects the expansion of the lithium-ion battery by detecting the change in fluid pressure in the first cavity 1222 and the third cavity 1226.

[0062] In the present embodiment, in order to enable the detection assembly 120 to adapt to more test requirements, the fluid pressure test cavity 122 further comprises a third valve 1227, so that the detection assembly 120 has a fourth working mode. In this working mode, the first valve 1224 and the second valve 1226 are closed at the same time, and the third valve 1227 is opened to enable the first cavity 1222 and the third cavity 1226 to communicate, and the fluid pressure sensor 1221 detects the swelling condition of the lithium ion battery by detecting the fluid pressure change in the first cavity 1222 and the third cavity 1226. When the volume of the third cavity 1225 is set to be twice or more than twice the volume of the second cavity 1223, if the first cavity 1222 and the third cavity 1226 are communicated, the sum of the volumes of the first cavity 1222 and the third cavity 1225 will be more than 5 times the volume of the first cavity 1222, thereby adapting to the test requirements of the swelling conditions of lithium ion batteries of different volumes.

[0063] In one embodiment, the detection assembly 120 comprises a first tube 1231 and a second tube 1232.

[0064] The first cavity 1222 and the fluid pressure sensor 1221 are arranged on the first tube 1231.

[0065] The second cavity 1223 is arranged on the second tube 1232.

[0066] The first tube 1231 and the second tube 1232 are connected by a first valve 1233. The first valve 1233 has a first fluid passage 1234 formed therein to communicate the first cavity 1222 and the second cavity 1223. The first valve 1224 is arranged in the first fluid passage 1234 of the first valve 1233.

[0067] In the present embodiment, by arranging the first tube 1231 and the second tube 1232, the first cavity 1222 and the second cavity 1223 can be physically isolated from each other, thereby facilitating manufacturing. Similarly, by arranging the first valve 1233 between the first tube 1231 and the second tube 1232, and arranging the first valve 1224 in the first fluid passage 1234 of the first valve 1233, the manufacturing and installation of the first valve 1233 and the first valve 1224 also become simpler.

[0068] In one embodiment, the detection assembly 120 further comprises a third tube 1235.

[0069] The third cavity 1225 is disposed on the third tube 1235 .

[0070] A second conducting member 1236 is connected between the second tube 1232 and the third tube 1235. A second fluid channel 1237 is formed inside the second conducting member 1236 to connect the second cavity 1223 and the third cavity 1225. The second conducting valve 1226 is disposed in the second fluid channel 1237 of the second conducting member 1236.

[0071] In one embodiment, the detection component 120 further includes a third conductive member 1238 .

[0072] The third conducting member 1238 is disposed between the third tube 1235 and the first tube 1231 . A third fluid channel 1239 is formed inside the third conducting member 1238 to connect the first cavity 1222 and the third cavity 1225 . The third conducting valve 1227 is disposed in the third fluid channel 1239 of the third conducting member 1238 .

[0073] In this embodiment, a third conducting member 1238 is provided between the third tube body 1235 and the first tube body 1231, and the third conducting valve 1227 is provided in the third fluid channel 1239 of the third conducting member 1238. The manufacture and installation of the third conducting member 1238 and the third conducting valve 1227 also become simpler.

[0074] For ease of description, spatially relative terms such as "above," "on the upper surface of," "on top of," etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would then be positioned as "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0075] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0076] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A lithium-ion battery in-situ expansion test device, characterized in that: It comprises a clamping assembly and a detection assembly, wherein the lithium-ion battery is arranged in the clamping assembly, and the detection assembly is used to detect the expansion data of the lithium-ion battery; The detection assembly includes a fluid storage chamber and a fluid pressure testing chamber connected to the fluid storage chamber, wherein the fluid storage chamber directly or indirectly abuts against the lithium-ion battery and changes in volume as the lithium-ion battery expands, and a fluid pressure sensor is disposed in the fluid pressure testing chamber; The fluid pressure test chamber includes a first cavity, a second cavity, and a first conduction valve connected between the first cavity and the second cavity. The fluid pressure sensor is disposed in the first cavity. The detection component has a first working mode and a second working mode. In a first working mode, the first conduction valve is closed, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity; In the second working mode, the first conduction valve is opened to connect the first cavity and the second cavity, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting the change in fluid pressure in the first cavity and the second cavity.

2. The lithium-ion battery in-situ expansion testing device according to claim 1, characterized in that: The volume of the second cavity is greater than that of the first cavity.

3. The lithium-ion battery in-situ expansion testing device according to claim 2, characterized in that: The volume of the second cavity is twice or more than twice the volume of the first cavity.

4. The lithium-ion battery in-situ expansion testing device according to any one of claims 1 to 3, characterized in that: The fluid pressure test chamber further includes a third cavity and a second conduction valve; The second conduction valve is connected between the second cavity and the third cavity, and the detection component further includes a third working mode; In the third operating mode, the first conduction valve and the second conduction valve are opened simultaneously to connect the first cavity, the second cavity, and the third cavity, and the fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity, the second cavity, and the third cavity.

5. The lithium-ion battery in-situ expansion testing device according to claim 4, characterized in that: The fluid pressure test chamber further includes a third conduction valve; The third conducting valve is connected between the first cavity and the third cavity, and the detection component further includes a fourth working mode; In a fourth operating mode, the first conduction valve and the second conduction valve are closed simultaneously, and the third conduction valve is opened to connect the first cavity and the third cavity. The fluid pressure sensor detects the expansion of the lithium-ion battery by detecting changes in the fluid pressure in the first cavity and the third cavity.

6. The lithium-ion battery in-situ expansion testing device according to claim 5, characterized in that: The volume of the third cavity is greater than that of the second cavity.

7. The lithium-ion battery in-situ expansion testing device according to claim 6, characterized in that: The volume of the third cavity is twice or more than twice the volume of the second cavity.

8. The lithium-ion battery in-situ expansion testing device according to any one of claims 5 to 7, characterized in that: The detection assembly includes a first tube body and a second tube body; The first cavity and the fluid pressure sensor are arranged on the first tube; The second cavity is arranged on the second tube; A first conducting member is connected between the first tube body and the second tube body. A first fluid channel is formed inside the first conducting member to connect the first cavity and the second cavity. The first conducting valve is arranged in the first fluid channel of the first conducting member.

9. The lithium-ion battery in-situ expansion testing device according to claim 8, characterized in that: The detection assembly further includes a third tube body; The third cavity is arranged on the third tube; A second conducting member is connected between the second tube body and the third tube body. A second fluid channel is formed inside the second conducting member to connect the second cavity and the third cavity. The second conducting valve is provided in the second fluid channel of the second conducting member.

10. The lithium-ion battery in-situ expansion testing device according to claim 9, characterized in that: The detection component further includes a third conductive member; The third conducting member is disposed between the third tube body and the first tube body. A third fluid channel is formed inside the third conducting member to connect the first cavity and the third cavity. The third conducting valve is disposed in the third fluid channel of the third conducting member.

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