Lithium ion battery in-situ expansion testing device and testing method

Abstract

The invention discloses a lithium ion battery in-situ expansion test device and a test method. The testing device comprises a clamping assembly and an expansion testing assembly. The clamping assembly comprises a first plate body and a second plate body. And the lithium ion battery is clamped between the second plate body and the first plate body. The expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber. The fluid storage cavity abuts against the top of the second plate body. And a fluid pressure sensor is arranged in the fluid pressure testing cavity. In the testing process, the lithium ion battery expands to enable the second plate body to move upwards, so that the volume of the fluid storage cavity is changed, and the fluid in the fluid storage cavity is transmitted into the fluid pressure testing cavity. And the fluid pressure sensor measures the expansion condition of the lithium ion battery by detecting the fluid pressure change. And by arranging the fluid storage cavity and the fluid pressure sensor, the expansion condition of the lithium ion battery can be measured through the fluid pressure sensor, so that the test process is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion battery testing, and in particular to a lithium-ion battery in-situ expansion testing device and testing method. 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 the use of lithium-ion batteries, fluid will be generated inside due to multiple charge and discharge processes, which will cause the volume of the lithium-ion battery to expand and generate a certain expansion force to the outside. How to detect the expansion deformation of lithium-ion batteries during operation is a problem that people currently need to solve.

[0004] A commonly used method for detecting the expansion deformation of lithium-ion batteries is to use a pressure sensor directly in contact with the surface of the lithium-ion battery. When the lithium-ion battery expands and deforms, the pressure sensor can directly measure the expansion deformation of the lithium-ion battery. However, in this method, the pressure sensor is in direct contact with the lithium-ion battery. When the lithium-ion battery heats up, catches fire or even explodes during the test, it is easy to cause damage to the pressure sensor. In addition, the pressure sensor generally detects the pressure value through the relationship curve between the deformation amount and pressure of the metal. When the temperature of the lithium-ion battery rises during the test, the relationship curve between the deformation amount and pressure of the metal will deviate from the pre-set relationship curve, which will seriously affect the accuracy of the test results. Summary of the invention

[0005] The main purpose of the present application is to provide a lithium-ion battery in-situ expansion test device and test method to solve the problem in the prior art that the pressure sensor is easily damaged or the test result is inaccurate due to the close distance between the pressure sensor and the lithium-ion battery during the lithium-ion battery expansion test.

[0006] One embodiment of the present application provides a lithium-ion battery in-situ expansion test device for testing the expansion of a lithium-ion battery. The lithium-ion battery in-situ expansion test device includes a clamping component and an expansion test component;

[0007] The clamping assembly includes a first plate body and a second plate body;

[0008] The second plate is disposed on the first plate, and a receiving space for receiving the lithium-ion battery is disposed between the second plate and the first plate;

[0009] The expansion test assembly is arranged on the clamping assembly, and the expansion test assembly comprises a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber;

[0010] The fluid storage chamber is in contact with the top of the second plate body, and a fluid pressure sensor is arranged in the fluid pressure test chamber. During the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body causes the volume of the fluid storage chamber to change, so that the fluid in the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber.

[0011] In one embodiment, the clamping assembly further includes a third plate body, and the third plate body is disposed on the second plate body and fixedly connected to the first plate body.

[0012] In one embodiment, the fluid storage chamber includes a first cylinder body and a first telescopic rod extending downward from the first cylinder body, the first cylinder body is arranged on the top of the third plate body, the first telescopic rod passes through the third plate body and abuts against the top of the second plate body, and a fluid pressure sensor is arranged in the fluid pressure testing chamber. During the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body drives the first telescopic rod of the fluid storage chamber to shorten, so that the fluid in the first cylinder body of the fluid storage chamber is transmitted to the fluid pressure testing chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure testing chamber.

[0013] In one embodiment, the fluid storage chamber further includes a second cylinder and a second telescopic rod;

[0014] The second cylinder body is arranged on the top of the third plate body, and the second cylinder body and the first cylinder body are respectively arranged at two opposite ends of the fluid pressure test chamber, and the second telescopic rod passes through the third plate body and abuts against the top of the second plate body.

[0015] In one embodiment, the fluid storage chamber further includes a third cylinder, a third telescopic rod, a fourth cylinder and a fourth telescopic rod;

[0016] The third cylinder body and the fourth cylinder body are arranged on the top of the third plate body, and the first cylinder body, the second cylinder body, the third cylinder body and the fourth cylinder body are arranged around the fluid pressure test chamber, the third telescopic rod and the fourth telescopic rod pass through the third plate body and abut against the top of the second plate body, and the first telescopic rod, the second telescopic rod, the third telescopic rod and the fourth telescopic rod are respectively abutted against the four sides of the second plate body.

[0017] In one embodiment, the expansion test assembly further comprises:

[0018] a first capillary connecting tube, the first capillary connecting tube being connected between the first cylinder and the fluid pressure testing chamber and being used for transferring the fluid in the first cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the first cylinder;

[0019] and / or, a second capillary connecting tube, the second capillary connecting tube being connected between the second cylinder and the fluid pressure testing chamber, and being used for transferring the fluid in the second cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the second cylinder;

[0020] and / or, a third capillary connecting tube, the third capillary connecting tube being connected between the third cylinder and the fluid pressure testing chamber, and being used for transferring the fluid in the third cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the third cylinder;

[0021] And / or, a fourth capillary connecting tube, the fourth capillary connecting tube is connected between the fourth cylinder body and the fluid pressure testing chamber, and is used for transferring the fluid in the fourth cylinder body to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the fourth cylinder body.

[0022] In one embodiment, the inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 3 mm.

[0023] In one embodiment, the inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 2 mm.

[0024] In one embodiment, the expansion test assembly further comprises:

[0025] The detection tube body is arranged on the third plate body, the fluid pressure test cavity is arranged inside the detection tube body, the detection tube body also includes a first accommodating cavity, the fluid pressure test cavity is connected with the first accommodating cavity, and the fluid pressure sensor is arranged in the first accommodating cavity for detecting the fluid pressure change in the fluid pressure test cavity.

[0026] In one embodiment, the detection tube body further includes:

[0027] A first connecting hole, wherein the first connecting hole is connected to the fluid pressure test chamber, and a one-way valve is arranged in the first connecting hole. Before testing the lithium-ion battery, the fluid pressure test chamber is inflated through the first one-way valve in the first connecting hole, and the fluid is transmitted from the fluid pressure test chamber to one or more of the first cylinder body, the second cylinder body, the third cylinder body, and the fourth cylinder body, thereby driving one or more of the first telescopic rod, the second telescopic rod, the third telescopic rod, and the fourth telescopic rod to extend and press downward, thereby driving the second plate body to pre-tighten the lithium-ion battery.

[0028] In one embodiment, the fluid pressure test chamber includes a first cavity, a second cavity, a third cavity and a fourth cavity, the first cylinder body is connected to the first cavity, the second cylinder body is connected to the second cavity, the third cylinder body is connected to the third cavity, and the fourth cylinder body is connected to the fourth cavity, the fluid pressure sensor includes a first fluid pressure sensor, a second fluid pressure sensor, a third fluid pressure sensor and a fourth fluid pressure sensor, the first fluid pressure sensor is arranged in the first cavity to detect the fluid pressure change in the first cavity, the second fluid pressure sensor is arranged in the second cavity to detect the fluid pressure change in the second cavity, the third fluid pressure sensor is arranged in the third cavity to detect the fluid pressure change in the third cavity, and the fourth fluid pressure sensor is arranged in the fourth cavity to detect the fluid pressure change in the fourth cavity.

[0029] In one of the embodiments, the lithium-ion battery in-situ expansion test device also includes a plurality of fixed columns, wherein the fixed columns are arranged between the first plate body and the third plate body, one end of the fixed column is fixedly connected to the first plate body, and the other end of the fixed column is fixedly connected to the third plate body, and the second plate body has a guide hole, and the fixed column is arranged through the guide hole of the second plate body, and the aperture of the guide hole is larger than the diameter of the fixed column, so that the second plate body can move up and down along the fixed column.

[0030] In one embodiment, the fluid storage chamber includes one or more air bags / liquid bags, and the one or more air bags / liquid bags are arranged between the second plate body and the third plate body. When the lithium ion battery arranged between the second plate body and the first plate body expands, the lithium ion battery squeezes the second plate body to move the second plate body upward, thereby reducing the distance between the second plate body and the third plate body, thereby changing the volume of the one or more air bags / liquid bags, so that the fluid in the fluid storage chamber is transferred to the fluid pressure testing chamber.

[0031] In one of the embodiments, the lithium-ion battery in-situ expansion test device further includes a thickness measurement component, and the thickness measurement component is used to detect the thickness change of the lithium-ion battery.

[0032] In one embodiment, the lithium-ion battery in-situ expansion test device further includes a control component, wherein the control component is connected to the fluid storage chamber and is used to control the volume of the fluid in the fluid storage chamber.

[0033] Another embodiment of the present invention further provides a lithium ion battery in-situ expansion test method for testing the expansion of a lithium ion battery, comprising the following steps:

[0034] The lithium-ion battery is clamped by a clamping assembly, the clamping assembly comprising a first plate and a second plate; the second plate is arranged on the first plate, and a receiving space for accommodating the lithium-ion battery is arranged between the second plate and the first plate; the lithium-ion battery is arranged in the receiving space between the second plate and the first plate;

[0035] An expansion test assembly is used to test the expansion of the lithium-ion battery in the clamping assembly, wherein the expansion test assembly is arranged on the clamping assembly, and the expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber;

[0036] The fluid storage chamber is in contact with the top of the second plate body, and a fluid pressure sensor is arranged in the fluid pressure test chamber. During the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body causes the volume of the fluid storage chamber to change, so that the fluid in the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber.

[0037] In one embodiment, before testing the lithium-ion battery, the fluid pressure test chamber is inflated, and the fluid is transferred from the fluid pressure test chamber to the fluid pressure storage chamber, thereby driving the second plate to pre-tighten the lithium-ion battery.

[0038] One of the embodiments of the present application also provides a lithium-ion battery in-situ expansion test device, including an expansion test assembly;

[0039] The expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber;

[0040] The fluid storage cavity is directly or indirectly connected to the lithium-ion battery, and a fluid pressure sensor is arranged in the fluid pressure test cavity. During the test, when the lithium-ion battery expands, the lithium-ion battery squeezes the fluid storage cavity to change the volume of the fluid storage cavity, so that the fluid in the fluid storage cavity is transmitted to the fluid pressure test cavity. The fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test cavity.

[0041] The lithium-ion battery in-situ expansion test device and test method of the present application have the following advantages and beneficial effects:

[0042] 1. In the lithium-ion battery in-situ expansion test device provided in the present application, a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber are provided, and a fluid pressure sensor is provided in the fluid pressure test chamber. At this time, the pressure change caused by the expansion of the lithium-ion battery is first transmitted to the fluid storage chamber, so that the fluid volume of the cylinder in the fluid storage chamber changes. Since the fluid storage chamber is connected to the fluid pressure test chamber, the change in the fluid volume in the cylinder will cause the fluid pressure in the fluid pressure test chamber to change. Therefore, the fluid pressure change in the fluid pressure test chamber is detected by the fluid pressure sensor, and then the deformation caused by the expansion of the lithium-ion battery can be calculated. In the above test device, the fluid pressure sensor does not directly contact the lithium-ion battery, thereby avoiding the situation that the lithium-ion battery is easily damaged when it heats up, catches fire or even explodes during the test. In one embodiment, the fluid storage chamber includes a first cylinder and a first telescopic rod extending downward from the first cylinder, the first cylinder is arranged on the top of the third plate, and the first telescopic rod passes through the third plate and abuts on the top of the second plate. During the test, the lithium-ion battery squeezes the second plate body so that the second plate body moves upward, and the upward movement of the second plate body drives the first telescopic rod of the fluid storage chamber to shorten, so that the fluid in the first cylinder of the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber. It can be seen that even if the lithium-ion battery generates heat, catches fire or even explodes during the test, the possibility of damage to the fluid pressure sensor will be greatly reduced through the isolation of the second plate body, the first telescopic rod, the first cylinder body and the fluid pressure test chamber, thereby enhancing the safety and reliability of the lithium-ion battery in-situ expansion test device in the present application.

[0043] 2. In the lithium-ion battery in-situ expansion test device provided in the present application, the fluid storage chamber is configured to include a first cylinder and a first telescopic rod extending downward from the first cylinder, the first cylinder is arranged on the top of the third plate, and the first telescopic rod passes through the third plate and abuts against the top of the second plate. At this time, the deformation of the lithium-ion battery expansion is achieved by the extension or shortening of the first telescopic rod. In traditional pressure sensors, the pressure value is generally detected by the relationship curve between the deformation of the metal and the pressure. When the temperature of the lithium-ion battery rises during the test, the relationship curve between the deformation of the metal and the pressure will deviate from the pre-set relationship curve, thereby seriously affecting the accuracy of the test results. In the lithium-ion battery in-situ expansion test device provided in this embodiment, even if the temperature of the lithium-ion battery rises during the test, the temperature rise will basically not have much effect on the extension or shortening of the first telescopic rod. At the same time, due to the isolation of the second plate, the first telescopic rod, the first cylinder, and the fluid pressure test chamber, the influence of the temperature rise of the lithium-ion battery during the test on the fluid pressure sensor is also greatly reduced, thereby ensuring that the lithium-ion battery in-situ expansion test device in the present application can ensure the accuracy of the test results even when an abnormality occurs in the lithium-ion battery.

[0044] 3. In the lithium-ion battery in-situ expansion test device provided by the present application, a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber are used, and a fluid pressure sensor is arranged in the fluid pressure test chamber to detect the expansion pressure of the lithium-ion battery. Compared with the traditional method of using a pressure sensor, since the cost of the fluid storage chamber + fluid pressure sensor is much lower than the cost of the pressure sensor, the manufacturing cost of the lithium-ion battery in-situ expansion test device provided by the present application is much lower than the cost of the test device using a pressure sensor.

[0045] 4. In one embodiment, the fluid storage chamber further includes a second cylinder body and a second telescopic rod; the second cylinder body is arranged on the top of the third plate body, and the second cylinder body and the first cylinder body are respectively arranged at two opposite ends of the fluid pressure test chamber, and the second telescopic rod passes through the third plate body and abuts against the top of the second plate body. By setting the first cylinder body and the second cylinder body, and setting the first telescopic rod and the second telescopic rod, since the second cylinder body and the first cylinder body are respectively arranged at two opposite ends of the fluid pressure test chamber, at this time, even if the expansion position of the lithium-ion battery is not in the center position but is offset. The symmetrically arranged first cylinder body and the second cylinder body, and the symmetrically arranged first telescopic rod and the second telescopic rod can still effectively detect the expansion pressure of the lithium-ion battery, thereby ensuring the accuracy of the expansion pressure test result.

[0046] 5. In one embodiment, the fluid storage chamber further includes a third cylinder, a third telescopic rod, a fourth cylinder and a fourth telescopic rod; the third cylinder and the fourth cylinder are arranged on the top of the third plate, and the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are arranged around the fluid pressure test chamber, the third telescopic rod and the fourth telescopic rod pass through the third plate and abut on the top of the second plate, and the first telescopic rod, the second telescopic rod, the third telescopic rod and the fourth telescopic rod are respectively abutted on the four sides of the second plate. By arranging the first to fourth cylinders and the first to fourth telescopic rods, since the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are arranged around the fluid pressure test chamber, and the first telescopic rod, the second telescopic rod, the third telescopic rod and the fourth telescopic rod are respectively abutted on the four sides of the second plate. At this time, no matter where the lithium-ion battery expands, the first to fourth cylinders and the first to fourth telescopic rods arranged around the four sides can still effectively detect the expansion pressure of the lithium-ion battery, thereby ensuring the accuracy of the expansion pressure test result.

[0047] 6. In one embodiment, a first connecting hole is provided on the detection tube body, and the first connecting hole is connected to the fluid pressure test chamber. Since a one-way valve is provided in the first connecting hole, before testing the lithium-ion battery, the fluid pressure test chamber is inflated through the first one-way valve in the first connecting hole, and the fluid is transmitted from the fluid pressure test chamber to one or more of the first cylinder body, the second cylinder body, the third cylinder body, and the fourth cylinder body, thereby driving one or more of the first telescopic rod, the second telescopic rod, the third telescopic rod, and the fourth telescopic rod to extend and press downward, thereby driving the second plate body to pre-tighten the lithium-ion battery. In the existing lithium-ion battery expansion detection device, a pressure plate with a pressure sensor is generally pressed against the lithium-ion battery by a hand-cranked screw, and then the lithium-ion battery is powered on, and the expansion condition is detected by reading the value change of the pressure sensor. In the lithium-ion battery in-situ expansion test device provided in this embodiment, the lithium-ion battery can be pre-tightened by inflating the first connecting hole of the detection tube body, and the pre-tightening operation process is simpler and easier to operate.

[0048] 7. In one embodiment, the fluid pressure test chamber includes a first cavity, a second cavity, a third cavity and a fourth cavity, the first cylinder body is connected to the first cavity, the second cylinder body is connected to the second cavity, the third cylinder body is connected to the third cavity, and the fourth cylinder body is connected to the fourth cavity, the fluid pressure sensor includes a first fluid pressure sensor, a second fluid pressure sensor, a third fluid pressure sensor and a fourth fluid pressure sensor, the first fluid pressure sensor is arranged in the first cavity to detect the fluid pressure change in the first cavity, the second fluid pressure sensor is arranged in the second cavity to detect the fluid pressure change in the second cavity, the third fluid pressure sensor is arranged in the third cavity to detect the fluid pressure change in the third cavity, and the fourth fluid pressure sensor is arranged in the fourth cavity to detect the fluid pressure change in the fourth cavity. By respectively setting up four independent first cavities, second cavities, third cavities and fourth cavities, and respectively setting up four independent first fluid pressure sensors, second fluid pressure sensors, third fluid pressure sensors and fourth fluid pressure sensors, since the first telescopic rod, the second telescopic rod, the third telescopic rod and the fourth telescopic rod are respectively abutted against the four sides of the second plate body, no matter which part of the lithium-ion battery expands due to the generation of fluid, according to the pressure detection conditions of the first fluid pressure sensor, the second fluid pressure sensor, the third fluid pressure sensor and the fourth fluid pressure sensor, the position where the lithium-ion battery expands and the expansion pressure conditions can be accurately tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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:

[0050] Figure 1 A three-dimensional diagram of an in-situ expansion test device for a lithium-ion battery disclosed in one embodiment of the present application;

[0051] Figure 2 for Figure 1 A three-dimensional diagram of the lithium-ion battery in-situ expansion test device without the third plate;

[0052] Figure 3 for Figure 1 A side view of the in-situ expansion test apparatus for lithium-ion batteries;

[0053] Figure 4 for Figure 1 A schematic top view of an in-situ expansion test device for lithium-ion batteries;

[0054] Figure 5 for Figure 4 A schematic cross-sectional view of the in-situ expansion test device for lithium-ion batteries along the AA direction;

[0055] Figure 6 for Figure 4 A schematic cross-sectional view of the in-situ expansion test device for lithium-ion batteries along the BB direction;

[0056] Figure 7 A schematic top view of an in-situ expansion test device for a lithium-ion battery provided in another embodiment of the present application;

[0057] Figure 8 A cross-sectional schematic diagram of a lithium-ion battery in-situ expansion test device provided in yet another embodiment of the present application;

[0058] Fig. 9 A schematic flow chart of an in-situ expansion test method for a lithium-ion battery provided in another embodiment of the present application. DETAILED DESCRIPTION

[0059] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0060] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] Please also see Figures 1 to 6One embodiment of the present application provides a lithium-ion battery in-situ expansion test device 100 for testing the expansion of a lithium-ion battery. The lithium-ion battery in-situ expansion test device 100 includes a clamping assembly 110 and an expansion test assembly 120. In this embodiment, the lithium-ion battery in-situ expansion test device 100 can perform thickness testing, expansion testing, pressure testing, etc. on the lithium-ion battery.

[0063] The clamping assembly 110 includes a first plate 111, a second plate 112, and a third plate 113. It can be understood that the clamping assembly 110 may also include only the first plate 111 and the second plate 112.

[0064] The second plate body 112 is disposed on the first plate body 111. An accommodation space for accommodating the lithium-ion battery is disposed between the second plate body 112 and the first plate body 111.

[0065] The third plate 113 is disposed on the second plate 112 and fixedly connected to the first plate 111 .

[0066] In this embodiment, the first plate 111, the second plate 112 and the third plate 113 are all in a quadrilateral shape. As required, the first plate 111, the second plate 112 and the third plate 113 may also be in other shapes, which are not specifically limited here.

[0067] The expansion test assembly 120 is disposed on the clamp assembly 110 . The expansion test assembly 120 includes a fluid storage chamber 121 and a fluid pressure test chamber 122 connected to the fluid storage chamber 121 .

[0068] The fluid storage chamber 121 is in contact with the top of the second plate 112. A fluid pressure sensor 1221 is disposed in the fluid pressure test chamber 122. During the test, when the lithium-ion battery disposed between the second plate 112 and the first plate 111 expands, the lithium-ion battery squeezes the second plate 112 so that the second plate 112 moves upward. The upward movement of the second plate 112 changes the volume of the fluid storage chamber 121, so that the fluid in the fluid storage chamber 121 is transferred to the fluid pressure test chamber 122. The fluid pressure sensor 1221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 122.

[0069] In one 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 cylinder 1211 is disposed on the top of the third plate 113. The first telescopic rod 1212 passes through the third plate 113 and abuts against the top of the second plate 112. A fluid pressure sensor 1221 is disposed in the fluid pressure test chamber 122. During the test, when the lithium-ion battery disposed between the second plate 112 and the first plate 111 expands, the lithium-ion battery squeezes the second plate 112 so that the second plate 112 moves upward, and the upward movement of the second plate 112 drives the first telescopic rod 1212 of the fluid storage chamber 121 to shorten, so that the fluid in the first cylinder 1211 of the fluid storage chamber 121 is transmitted to the fluid pressure test chamber 122. The fluid pressure sensor 1221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 122. In fact, in the fluid storage chamber 121, one end of the first telescopic rod 1212 abuts against the top of the second plate 112, and a piston is connected to the first telescopic rod 1212, and the piston can move up and down in the first cylinder 1211. When the first telescopic rod 1212 moves up, the first telescopic rod 1212 drives the piston to move up, thereby changing the volume of the fluid in the first cylinder 1211. When the first telescopic rod 1212 moves down, the first telescopic rod 1212 drives the piston to move down, thereby increasing the volume of the fluid in the first cylinder 1211.

[0070] In this embodiment, the fluid may be a gas or a liquid, as long as it can be transferred between the first cylinder 1211 and the fluid pressure testing chamber 122 under pressure.

[0071] In the lithium-ion battery in-situ expansion test device 100 provided in this embodiment, a fluid storage chamber 121 and a fluid pressure test chamber 122 connected to the fluid storage chamber 121 are provided, and a fluid pressure sensor 1221 is provided in the fluid pressure test chamber 122. At this time, the pressure change caused by the expansion of the lithium-ion battery is first transmitted to the fluid storage chamber 121, so that the fluid volume of the cylinder in the fluid storage chamber 121 changes. Since the fluid storage chamber 121 is connected to the fluid pressure test chamber 122, the change in the fluid volume in the cylinder will cause the fluid pressure in the fluid pressure test chamber 122 to change. Therefore, the fluid pressure change in the fluid pressure test chamber 122 is detected by the fluid pressure sensor 1221, and then the deformation caused by the expansion of the lithium-ion battery can be calculated. In the above test device, the fluid pressure sensor 1221 does not directly contact the lithium-ion battery, thereby avoiding the situation that the fluid pressure sensor 1221 is easily damaged when the lithium-ion battery heats up, catches fire or even explodes during the test. Specifically, 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 cylinder 1211 is disposed on the top of the third plate 113. The first telescopic rod 1212 passes through the third plate 113 and abuts against the top of the second plate 112. During the test, the lithium-ion battery squeezes the second plate 112 so that the second plate 112 moves upward, and the upward movement of the second plate 112 drives the first telescopic rod 1212 of the fluid storage chamber 121 to shorten, so that the fluid in the first cylinder 1211 of the fluid storage chamber 121 is transmitted to the fluid pressure test chamber 122, and the fluid pressure sensor 1221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 122. It can be seen that even if the lithium-ion battery generates heat, catches fire or even explodes during the test, the possibility of damage to the fluid pressure sensor 1221 will be greatly reduced due to the isolation of the second plate 112, the first telescopic rod 1212, the first cylinder 1211 and the fluid pressure test chamber 122, thereby enhancing the safety and reliability of the lithium-ion battery in-situ expansion test device 100 in the present application.

[0072] In addition, in the lithium-ion battery in-situ expansion test device 100 provided in the present application, the fluid storage chamber 121 is configured to include a first cylinder 1211 and a first telescopic rod 1212 extending downward from the first cylinder 1211. The first cylinder 1211 is disposed on the top of the third plate 113. The first telescopic rod 1212 passes through the third plate 113 and abuts against the top of the second plate 112. At this time, the deformation of the lithium-ion battery expansion is achieved by the extension or contraction of the first telescopic rod 1212. In a conventional pressure sensor, the pressure value is generally detected by a relationship curve between the deformation of the metal and the pressure. When the temperature of the lithium-ion battery rises during the test, the relationship curve between the deformation of the metal and the pressure will deviate from the pre-set relationship curve, thereby seriously affecting the accuracy of the test result. In the lithium-ion battery in-situ expansion test device 100 provided in this embodiment, even if the temperature of the lithium-ion battery rises during the test, the temperature rise will basically not have much effect on the extension or contraction of the first telescopic rod 1212. At the same time, due to the isolation of the second plate 112, the first telescopic rod 1212, the first cylinder 1211, and the fluid pressure test chamber 122, the impact of the temperature rise of the lithium-ion battery during the test on the fluid pressure sensor 1221 is also greatly reduced, thereby ensuring that the lithium-ion battery in-situ expansion test device 100 in the present application can ensure the accuracy of the test results even when an abnormality occurs in the lithium-ion battery.

[0073] In fact, in traditional lithium-ion battery in-situ expansion test devices, the operating temperature of the pressure sensor generally does not exceed 65°C. When the temperature of the lithium-ion battery rises, the detection accuracy of the pressure sensor will decrease. In the lithium-ion battery in-situ expansion test device 100 provided in the present application, even if the temperature of the lithium-ion battery rises to 100°C or even 200°C, since the fluid storage chamber 121 only relies on the first telescopic rod 1212 to abut against the second plate body 112, and the second plate body 112 presses on the lithium-ion battery, the corresponding temperature will not affect the extension or shortening of the first telescopic rod 1212. That is, the temperature rise of the lithium-ion battery will not have much impact on the working mode of the fluid pressure sensor 1221 in the fluid storage chamber 121 plus the fluid pressure test chamber 122.

[0074] At the same time, in the lithium-ion battery in-situ expansion test device 100 provided in the present application, a fluid storage chamber 121 and a fluid pressure test chamber 122 connected to the fluid storage chamber 121 are used, and a fluid pressure sensor 1221 is arranged in the fluid pressure test chamber 122 to detect the expansion pressure of the lithium-ion battery. Compared with the traditional method of using a pressure sensor, since the cost of the fluid storage chamber + fluid pressure sensor is much lower than the cost of the pressure sensor, the manufacturing cost of the lithium-ion battery in-situ expansion test device 100 provided in the present application is much lower than the cost of the test device using the pressure sensor. In fact, according to market research, the pressure sensor used in the lithium-ion battery in-situ expansion test device generally costs more than several thousand yuan, and its application temperature range is also relatively small, not exceeding 65°C. In the lithium-ion battery in-situ expansion test device 100 provided in the present application, the cost of a single fluid storage chamber plus a single fluid pressure sensor is only a few hundred yuan, which is much lower than the cost of the pressure sensor.

[0075] In one embodiment, the fluid storage chamber 121 further includes a second cylinder 1213 and a second telescopic rod 1214 .

[0076] The second cylinder 1213 is disposed on the top of the third plate 113, and the second cylinder 1213 and the first cylinder 1211 are respectively disposed at two opposite ends of the fluid pressure test chamber 122. The second telescopic rod 1214 passes through the third plate 113 and abuts against the top of the second plate 112.

[0077] In this embodiment, the first cylinder 1211 and the first telescopic rod 1212 matched therewith are arranged at one corner of the third plate 113. The second cylinder 1213 and the second telescopic rod 1214 matched therewith are arranged at another corner of the third plate 113. The first cylinder 1211 and the second cylinder 1213 are arranged diagonally. By setting the first cylinder 1211 and the second cylinder 1213, and setting the first telescopic rod 1212 and the second telescopic rod 1214, since the second cylinder 1213 and the first cylinder 1211 are respectively arranged at two opposite ends of the fluid pressure test chamber 122, at this time, even if the expansion position of the lithium-ion battery is not at the center position, but is offset. The symmetrically arranged first cylinder 1211 and the second cylinder 1213, and the symmetrically arranged first telescopic rod 1212 and the second telescopic rod 1214 can still effectively detect the expansion pressure of the lithium-ion battery, thereby ensuring the accuracy of the expansion pressure test result.

[0078] In one embodiment, the fluid storage chamber 121 further includes a third cylinder 1215 , a third telescopic rod 1216 , a fourth cylinder 1217 and a fourth telescopic rod 1218 .

[0079] The third cylinder 1215 and the fourth cylinder 1217 are disposed on the top of the third plate 113, and the first cylinder 1211, the second cylinder 1213, the third cylinder 1215, and the fourth cylinder 1217 are disposed around the fluid pressure test chamber 122. The third telescopic rod 1216 and the fourth telescopic rod 1218 pass through the third plate 113 and abut against the top of the second plate 112, and the first telescopic rod 1212, the second telescopic rod 1214, the third telescopic rod 1216, and the fourth telescopic rod 1218 abut against the four sides of the second plate 112, respectively.

[0080] In this embodiment, the first cylinder 1211, the second cylinder 1213, the third cylinder 1215 and the fourth cylinder 1217 are respectively arranged at the four corners of the third plate 113. By arranging the first to fourth cylinders 1211, 1213, 1215, 1217, and the first to fourth telescopic rods 1212, 1214, 1216, 1218, since the first cylinder 1211, the second cylinder 1213, the third cylinder 1215 and the fourth cylinder 1217 are arranged around the fluid pressure test chamber 122, and the first telescopic rod 1212, the second telescopic rod 1214, the third telescopic rod 1216 and the fourth telescopic rod 1218 are respectively abutted against the four sides of the second plate 112. At this time, no matter where the expansion position of the lithium-ion battery is, the first to fourth cylinders 1211, 1213, 1215, 1217 arranged around it, and the first to fourth telescopic rods 1212, 1214, 1216, 1218 arranged around it can still effectively detect the expansion pressure of the lithium-ion battery, thereby ensuring the accuracy of the expansion pressure test results.

[0081] It is understandable that in other embodiments, the number of cylinders and the number of telescopic rods are not in a one-to-one correspondence. One cylinder and multiple telescopic rods may be provided, or multiple cylinders and one telescopic rod may be provided. Similarly, the total number of cylinders and telescopic rods is not limited to the above embodiments, and may be set to 5 or more. Preferably, the total number of cylinders and telescopic rods may be set between 1 and 10, and their positions may also be determined as needed, and may be symmetrical, surrounding, evenly spaced, and the like. As needed, when there are multiple fluid storage chambers 121, the multiple fluid storage chambers 121 are connected to each other through pipes to ensure the same pressure.

[0082] In one embodiment, the expansion test assembly 120 further includes a first capillary connecting tube 1231 .

[0083] The first capillary connecting tube 1231 is connected between the first cylinder 1211 and the fluid pressure testing chamber 122 , and is used to transfer the fluid in the first cylinder 1211 to the fluid pressure testing chamber 122 , or to transfer the fluid in the fluid pressure testing chamber 122 to the first cylinder 1211 .

[0084] As required, the expansion test assembly 120 further includes a second capillary connection tube 1232. The second capillary connection tube 1232 is connected between the second cylinder 1213 and the fluid pressure test chamber 122, and is used to transfer the fluid in the second cylinder 1213 to the fluid pressure test chamber 122, or transfer the fluid in the fluid pressure test chamber 122 to the second cylinder 1213.

[0085] As required, the expansion test assembly 120 further includes a third capillary connection tube 1233. The third capillary connection tube 1233 is connected between the third cylinder 1215 and the fluid pressure test chamber 122, and is used to transfer the fluid in the third cylinder 1215 to the fluid pressure test chamber 122, or transfer the fluid in the fluid pressure test chamber 122 to the third cylinder 1215.

[0086] As required, the expansion test assembly 120 further includes a fourth capillary connection tube 1234. The fourth capillary connection tube 1234 is connected between the fourth cylinder 1217 and the fluid pressure test chamber 122, and is used to transfer the fluid in the fourth cylinder 1217 to the fluid pressure test chamber 122, or transfer the fluid in the fluid pressure test chamber 122 to the fourth cylinder 1217.

[0087] In this embodiment, by providing the first capillary connection tube 1231, the fluid of the first cylinder 1211 and the fluid pressure test chamber 122 can be mutually connected, so as to achieve the purpose of detecting the expansion of the lithium-ion battery by using the fluid pressure sensor 1221. Similarly, by providing the second capillary connection tube 1232, the fluid of the second cylinder 1213 and the fluid pressure test chamber 122 can be mutually connected, so as to achieve the purpose of detecting the expansion of the lithium-ion battery by using the fluid pressure sensor 1221. Similarly, by providing the third capillary connection tube 1233, the fluid of the third cylinder 1215 and the fluid pressure test chamber 122 can be mutually connected, so as to achieve the purpose of detecting the expansion of the lithium-ion battery by using the fluid pressure sensor 1221. Similarly, by providing the fourth capillary connection tube 1234, the fluid of the fourth cylinder 1217 and the fluid pressure test chamber 122 can be mutually connected, so as to achieve the purpose of detecting the expansion of the lithium-ion battery by using the fluid pressure sensor 1221.

[0088] In one embodiment, the inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 3 mm. Preferably, the inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 2 mm.

[0089] In one embodiment, the expansion test assembly 120 further includes a detection tube 124 .

[0090] The detection tube body 124 is disposed on the third plate body 113. The fluid pressure test chamber 122 is disposed inside the detection tube body 124. The detection tube body 124 further includes a first accommodating chamber 1241. The fluid pressure test chamber 122 is communicated with the first accommodating chamber 1241. The fluid pressure sensor 1221 is disposed in the first accommodating chamber 1241, and is used to detect changes in fluid pressure in the fluid pressure test chamber 122.

[0091] In this embodiment, by setting the detection tube body 124, and making the detection tube body 124 set on the third plate body 113, since the fluid pressure test chamber 122 is set inside the detection tube body 124, at this time, the connection between the first cylinder body 1211, the second cylinder body 1213, the third cylinder body 1215 and the fourth cylinder body 1217 and the fluid pressure test chamber 122 will become more convenient. The first cylinder body 1211, the second cylinder body 1213, the third cylinder body 1215 and the fourth cylinder body 1217 and the fluid pressure test chamber 122 can be directly connected by using capillary connecting tubes 1231-1234. In this embodiment, the first cylinder body 1211, the second cylinder body 1213, the third cylinder body 1215 and the fourth cylinder body 1217 are respectively provided with threaded interfaces connected with the capillary connecting tubes. Similarly, the detection tube body 124 is also provided with four threaded interfaces, which are respectively connected to the first to fourth capillary connection tubes 1231-1234. As required, the first accommodating cavity 1241 is provided at the top of the detection tube body 124, so that when an abnormality occurs in the lithium-ion battery, it is less likely to affect the normal operation of the fluid pressure sensor 1221.

[0092] In one embodiment, the detection tube body 124 further includes a first communication hole 1242 .

[0093] The first connecting hole 1242 is connected to the fluid pressure test chamber 122. A one-way valve (not shown) is arranged in the first connecting hole 1242. Before testing the lithium-ion battery, the fluid pressure test chamber 122 is inflated through the first one-way valve in the first connecting hole 1242, and the fluid is transmitted from the fluid pressure test chamber 122 to one or more of the first cylinder 1211, the second cylinder 1213, the third cylinder 1215 and the fourth cylinder 1217, thereby driving one or more of the first telescopic rod 1212, the second telescopic rod 1214, the third telescopic rod 1216 and the fourth telescopic rod 1218 to extend and press downward, thereby driving the second plate 112 to pre-tighten the lithium-ion battery.

[0094] In this embodiment, a first connecting hole 1242 is provided on the detection tube body 124, and the first connecting hole 1242 is connected to the fluid pressure test chamber 122. Since a one-way valve is provided in the first connecting hole 1242, before the lithium-ion battery is tested, the fluid pressure test chamber 122 is inflated through the first one-way valve in the first connecting hole 1242, and the fluid is transmitted from the fluid pressure test chamber 122 to one or more of the first cylinder 1211, the second cylinder 1213, the third cylinder 1215, and the fourth cylinder 1217, thereby driving one or more of the first telescopic rod 1212, the second telescopic rod 1214, the third telescopic rod 1216, and the fourth telescopic rod 1218 to extend and press downward, thereby driving the second plate 112 to pre-tighten the lithium-ion battery. In the existing lithium-ion battery expansion detection device, a pressure plate with a pressure sensor is generally pressed against the lithium-ion battery by a hand-cranked screw, and then the lithium-ion battery is powered on, and the expansion condition is detected by reading the value change of the pressure sensor. In the lithium-ion battery in-situ expansion test device 100 provided in this embodiment, the lithium-ion battery can be pre-tightened by inflating the first connecting hole 1242 of the detection tube body 124, and the pre-tightening operation process is simpler and easier to operate.

[0095] In one embodiment, the lithium-ion battery in-situ expansion test device 100 further includes a plurality of fixing columns 125. The fixing columns 125 are disposed between the first plate 111 and the third plate 113. One end of the fixing column 125 is fixedly connected to the first plate 111. The other end of the fixing column 125 is fixedly connected to the third plate 113. A guide hole 1121 is provided on the second plate 112. The fixing column 125 is disposed through the guide hole 1121 of the second plate 112. The diameter of the guide hole 1121 is larger than the diameter of the fixing column 125, so that the second plate 112 moves up and down along the fixing column 125.

[0096] It can be understood that the lithium-ion battery in-situ expansion testing device is not limited to the above embodiments.

[0097] Please also see Figure 7In another embodiment, the fluid pressure test chamber 122 includes a first chamber 1222, a second chamber 1223, a third chamber 1224, and a fourth chamber 1225. The first cylinder 1211 is connected to the first chamber 1222. The second cylinder 1213 is connected to the second chamber 1223. The third cylinder 1215 is connected to the third chamber 1224. The fourth cylinder 1217 is connected to the fourth chamber 1225. The fluid pressure sensor 1221 includes a first fluid pressure sensor 1226, a second fluid pressure sensor 1227, a third fluid pressure sensor 1228, and a fourth fluid pressure sensor 1229. The first fluid pressure sensor 1226 is disposed in the first chamber 1222 to detect changes in fluid pressure in the first chamber 1222. The second fluid pressure sensor 1227 is disposed in the second chamber 1223 to detect changes in fluid pressure in the second chamber 1223. The third fluid pressure sensor 1228 is disposed in the third cavity 1224 to detect changes in fluid pressure in the third cavity 1224 , and the fourth fluid pressure sensor 1229 is disposed in the fourth cavity 1225 to detect changes in fluid pressure in the fourth cavity 1225 .

[0098] In this embodiment, by respectively providing four independent first cavities 1222, second cavities 1223, third cavities 1224 and fourth cavities 1225, and respectively providing four independent first fluid pressure sensors 1226, second fluid pressure sensors 1227, third fluid pressure sensors 1228 and fourth fluid pressure sensors 1229, since the first telescopic rod 1212, the second telescopic rod 1214, the third telescopic rod 1216 and the fourth telescopic rod 1218 are respectively abutted against the four sides of the second plate 112, no matter which part of the lithium-ion battery expands due to the generation of fluid, according to the pressure detection conditions of the first fluid pressure sensor 1226, the second fluid pressure sensor 1227, the third fluid pressure sensor 1228 and the fourth fluid pressure sensor 1229, the position where the lithium-ion battery expands and the expansion pressure conditions can be accurately tested.

[0099] As required, the lithium-ion battery in-situ expansion test device 100 further includes a thickness measurement component. The thickness measurement component is used to detect the thickness change of the lithium-ion battery. In one embodiment, the thickness measurement component can be a micrometer, which is used to test the thickness change of the lithium-ion battery.

[0100] As required, the lithium-ion battery in-situ expansion test device 100 further includes a control component. The control component is connected to the fluid storage chamber 121 and is used to control the volume of the fluid in the fluid storage chamber 121. For example, after the lithium-ion battery expands, the fluid in the fluid storage chamber 121 is increased by the control component until the volume of the fluid in the fluid storage chamber 121 is equal to that before the lithium-ion battery expands. At this time, the fluid pressure sensor 1221 detects the change in the fluid pressure in the fluid pressure test chamber 122.

[0101] It is understandable that the fluid storage chamber 121 is not limited to the structure of a cylinder plus a telescopic rod. Figure 8 Another embodiment of the present application provides a lithium-ion battery in-situ expansion test device 200, which is used to test the expansion of a lithium-ion battery. The lithium-ion battery in-situ expansion test device 200 includes a clamping assembly 210 and an expansion test assembly 220. In this embodiment, the lithium-ion battery in-situ expansion test device 200 can perform thickness testing, expansion testing, pressure testing, etc. on the lithium-ion battery.

[0102] The clamping assembly 210 includes a first plate 211, a second plate 212, and a third plate 213. It can be understood that the clamping assembly 110 may also include only the first plate 111 and the second plate 112.

[0103] The second plate body 212 is disposed on the first plate body 211. An accommodation space for accommodating the lithium-ion battery is disposed between the second plate body 212 and the first plate body 211.

[0104] The third plate 213 is disposed on the second plate 212 and fixedly connected to the first plate 211 .

[0105] In this embodiment, the first plate 211, the second plate 212 and the third plate 213 are all in a quadrilateral shape. As required, the first plate 211, the second plate 212 and the third plate 213 may also be in other shapes, which are not specifically limited here.

[0106] The expansion test assembly 220 is disposed on the clamp assembly 210 . The expansion test assembly 220 includes a fluid storage chamber 221 and a fluid pressure test chamber 222 connected to the fluid storage chamber 221 .

[0107] The fluid storage chamber 221 is in contact with the top of the second plate 212. A fluid pressure sensor 2221 is disposed in the fluid pressure test chamber 222. During the test, when the lithium-ion battery disposed between the second plate 212 and the first plate 211 expands, the lithium-ion battery squeezes the second plate 212 so that the second plate 212 moves upward. The upward movement of the second plate 212 changes the volume of the fluid storage chamber 221, so that the fluid in the fluid storage chamber 221 is transferred to the fluid pressure test chamber 222. The fluid pressure sensor 2221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 222.

[0108] In this embodiment, the fluid storage chamber 221 includes one or more air bags / liquid bags. The one or more air bags / liquid bags are arranged between the second plate 212 and the third plate 213. When the lithium-ion battery arranged between the second plate 212 and the first plate 211 expands, the lithium-ion battery presses the second plate 212 so that the second plate 212 moves upward, thereby reducing the distance between the second plate 212 and the third plate 213, thereby changing the volume of the one or more air bags / liquid bags, so that the fluid in the fluid storage chamber 221 is transferred to the fluid pressure test chamber 222.

[0109] Different from the above embodiments, in this embodiment, the fluid storage chamber 221 is an air bag or liquid bag structure, which is arranged between the second plate 212 and the third plate 213. When the lithium-ion battery arranged between the second plate 212 and the first plate 211 expands, the lithium-ion battery squeezes the second plate 212 so that the second plate 212 moves upward, thereby reducing the distance between the second plate 212 and the third plate 213. The reduction in the distance between the second plate 212 and the third plate 213 causes the volume of the fluid storage chamber 221 to change, so that the fluid in the fluid storage chamber 221 is transmitted to the fluid pressure test chamber 222. The fluid pressure sensor 2221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 222. That is, since the fluid storage chamber 221 is an air bag or liquid bag structure, its overall deformation can cause the volume of the fluid storage chamber 221 to change without using a cylinder plus a telescopic rod structure.

[0110] See also Fig. 9 Another embodiment of the present invention further provides a lithium ion battery in-situ expansion test method for testing the expansion of a lithium ion battery, comprising the following steps:

[0111] The lithium-ion battery is clamped by a clamping assembly 110. The clamping assembly includes a first plate 111 and a second plate 112. The second plate 112 is disposed on the first plate 111. An accommodation space for accommodating the lithium-ion battery is disposed between the second plate 112 and the first plate 111. The lithium-ion battery is disposed in the accommodation space between the second plate 112 and the first plate 111.

[0112] The expansion test assembly 120 is used to test the expansion of the lithium-ion battery in the clamp assembly 110. The expansion test assembly 120 is disposed on the clamp assembly 110. The expansion test assembly 120 includes a fluid storage chamber 121 and a fluid pressure test chamber 122 connected to the fluid storage chamber 121.

[0113] The fluid storage chamber 121 is in contact with the top of the second plate 112. A fluid pressure sensor 1221 is disposed in the fluid pressure test chamber 122. During the test, when the lithium-ion battery disposed between the second plate 112 and the first plate 111 expands, the lithium-ion battery squeezes the second plate 112 so that the second plate 112 moves upward. The upward movement of the second plate 112 changes the volume of the fluid storage chamber 121, so that the fluid in the fluid storage chamber 121 is transferred to the fluid pressure test chamber 122. The fluid pressure sensor 1221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 122.

[0114] In one embodiment, the clamping assembly 110 further includes a third plate 113 . The third plate 113 is disposed on the second plate 112 and fixedly connected to the first plate 111 .

[0115] In one 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 cylinder 1211 is disposed on the top of the third plate 113. The first telescopic rod 1212 passes through the third plate 113 and abuts against the top of the second plate 112. A fluid pressure sensor 1221 is disposed in the fluid pressure test chamber 122. During the test, when the lithium-ion battery disposed between the second plate 112 and the first plate 111 expands, the lithium-ion battery squeezes the second plate 112 so that the second plate 112 moves upward, and the upward movement of the second plate 112 drives the first telescopic rod 1212 of the fluid storage chamber 121 to shorten, so that the fluid in the first cylinder 1211 of the fluid storage chamber 121 is transmitted to the fluid pressure test chamber 122, and the fluid pressure sensor 1221 measures the expansion of the lithium-ion battery by detecting the change in fluid pressure in the fluid pressure test chamber 122.

[0116] In one embodiment, before testing the lithium-ion battery, the fluid pressure test chamber 122 is inflated, and the fluid is transferred from the fluid pressure test chamber to the fluid pressure storage chamber 121, thereby driving the second plate 112 to pre-tighten the lithium-ion battery.

[0117] One of the embodiments of the present application also provides a lithium-ion battery in-situ expansion test device, including an expansion test assembly;

[0118] The expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber;

[0119] The fluid storage cavity is directly or indirectly connected to the lithium-ion battery, and a fluid pressure sensor is arranged in the fluid pressure test cavity. During the test, when the lithium-ion battery expands, the lithium-ion battery squeezes the fluid storage cavity to change the volume of the fluid storage cavity, so that the fluid in the fluid storage cavity is transmitted to the fluid pressure test cavity. The fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test cavity.

[0120] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "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 are interpreted accordingly.

[0121] 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.

[0122] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium-ion battery in-situ expansion test device, used to test the expansion of a lithium-ion battery, characterized in that: Includes a clamping assembly and an expansion test assembly; The clamping assembly includes a first plate body and a second plate body; The second plate is disposed on the first plate, and a receiving space for receiving the lithium-ion battery is disposed between the second plate and the first plate; The expansion test assembly is arranged on the clamping assembly, and the expansion test assembly comprises a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber; The fluid storage chamber is in contact with the top of the second plate body, and a fluid pressure sensor is arranged in the fluid pressure test chamber. During the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body causes the volume of the fluid storage chamber to change, so that the fluid in the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber.

2. The lithium-ion battery in-situ expansion test device according to claim 1, characterized in that: The clamping assembly also includes a third plate body, which is disposed on the second plate body and fixedly connected to the first plate body.

3. The lithium-ion battery in-situ expansion test device according to claim 2, characterized in that: The fluid storage chamber includes a first cylinder body and a first telescopic rod extending downward from the first cylinder body, the first cylinder body is arranged on the top of the third plate body, the first telescopic rod passes through the third plate body and abuts against the top of the second plate body, during the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body drives the first telescopic rod of the fluid storage chamber to shorten, so that the fluid in the first cylinder body of the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber.

4. The lithium-ion battery in-situ expansion test device according to claim 3, characterized in that: The fluid storage chamber also includes a second cylinder and a second telescopic rod; The second cylinder body is arranged on the top of the third plate body, and the second cylinder body and the first cylinder body are respectively arranged at two opposite ends of the fluid pressure test chamber, and the second telescopic rod passes through the third plate body and abuts against the top of the second plate body.

5. The lithium-ion battery in-situ expansion test device according to claim 4, characterized in that: The fluid storage chamber further includes a third cylinder, a third telescopic rod, a fourth cylinder and a fourth telescopic rod; The third cylinder body and the fourth cylinder body are arranged on the top of the third plate body, and the first cylinder body, the second cylinder body, the third cylinder body and the fourth cylinder body are arranged around the fluid pressure test chamber, the third telescopic rod and the fourth telescopic rod pass through the third plate body and abut against the top of the second plate body, and the first telescopic rod, the second telescopic rod, the third telescopic rod and the fourth telescopic rod are respectively abutted against the four sides of the second plate body.

6. The lithium-ion battery in-situ expansion test device according to any one of claims 1 to 5, characterized in that: The expansion test assembly also includes: a first capillary connecting tube, the first capillary connecting tube being connected between the first cylinder and the fluid pressure testing chamber and being used for transferring the fluid in the first cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the first cylinder; and / or, a second capillary connecting tube, the second capillary connecting tube being connected between the second cylinder and the fluid pressure testing chamber, and being used for transferring the fluid in the second cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the second cylinder; and / or, a third capillary connecting tube, the third capillary connecting tube being connected between the third cylinder and the fluid pressure testing chamber, and being used for transferring the fluid in the third cylinder to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the third cylinder; And / or, a fourth capillary connecting tube, the fourth capillary connecting tube is connected between the fourth cylinder body and the fluid pressure testing chamber, and is used for transferring the fluid in the fourth cylinder body to the fluid pressure testing chamber, or transferring the fluid in the fluid pressure testing chamber to the fourth cylinder body.

7. The lithium-ion battery in-situ expansion test device according to claim 6, characterized in that: An inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 3 mm.

8. The lithium-ion battery in-situ expansion test device according to claim 7, characterized in that: An inner diameter of the first capillary connecting tube, the second capillary connecting tube, the third capillary connecting tube or the fourth capillary connecting tube is less than or equal to 2 mm.

9. The lithium-ion battery in-situ expansion test device according to claim 6, characterized in that: The expansion test assembly also includes: The detection tube body is arranged on the third plate body, the fluid pressure test cavity is arranged inside the detection tube body, the detection tube body also includes a first accommodating cavity, the fluid pressure test cavity is connected with the first accommodating cavity, and the fluid pressure sensor is arranged in the first accommodating cavity for detecting the fluid pressure change in the fluid pressure test cavity.

10. The lithium-ion battery in-situ expansion test device according to claim 9, characterized in that: The detection tube body also includes: a first communicating hole, wherein the first communicating hole is connected with the fluid pressure test chamber, wherein a one-way valve is arranged in the first communicating hole; before testing the lithium-ion battery, air is inflated into the fluid pressure test chamber through the first one-way valve in the first communicating hole, and fluid is transmitted from the fluid pressure test chamber to one or more of the first cylinder body, the second cylinder body, the third cylinder body, and the fourth cylinder body, thereby driving one or more of the first telescopic rod, the second telescopic rod, the third telescopic rod, and the fourth telescopic rod to extend and press downward, thereby driving the second plate body to pre-tighten the lithium-ion battery.

11. The lithium-ion battery in-situ expansion test device according to claim 10, characterized in that: The fluid pressure test chamber includes a first chamber, a second chamber, a third chamber and a fourth chamber, the first cylinder body is connected to the first chamber, the second cylinder body is connected to the second chamber, the third cylinder body is connected to the third chamber, and the fourth cylinder body is connected to the fourth chamber. The fluid pressure sensor includes a first fluid pressure sensor, a second fluid pressure sensor, a third fluid pressure sensor and a fourth fluid pressure sensor. The first fluid pressure sensor is arranged in the first chamber to detect the change of fluid pressure in the first chamber, the second fluid pressure sensor is arranged in the second chamber to detect the change of fluid pressure in the second chamber, the third fluid pressure sensor is arranged in the third chamber to detect the change of fluid pressure in the third chamber, and the fourth fluid pressure sensor is arranged in the fourth chamber to detect the change of fluid pressure in the fourth chamber.

12. The lithium-ion battery in-situ expansion test device according to claim 3, characterized in that: The lithium-ion battery in-situ expansion test device also includes a plurality of fixed columns, which are arranged between the first plate body and the third plate body, one end of the fixed column is fixedly connected to the first plate body, and the other end of the fixed column is fixedly connected to the third plate body, the second plate body has a guide hole, and the fixed column is arranged through the guide hole of the second plate body, and the aperture of the guide hole is larger than the diameter of the fixed column, so that the second plate body moves up and down along the fixed column.

13. The lithium-ion battery in-situ expansion test device according to claim 2, characterized in that: The fluid storage chamber includes one or more air bags / liquid bags, and the one or more air bags / liquid bags are arranged between the second plate body and the third plate body. When the lithium ion battery arranged between the second plate body and the first plate body expands, the lithium ion battery squeezes the second plate body to move the second plate body upward, thereby reducing the distance between the second plate body and the third plate body, thereby changing the volume of the one or more air bags / liquid bags, so that the fluid in the fluid storage chamber is transmitted to the fluid pressure testing chamber.

14. The lithium-ion battery in-situ expansion test device according to claim 1, characterized in that: It also includes a thickness measuring component, which is used to detect the thickness change of the lithium-ion battery.

15. The lithium-ion battery in-situ expansion test device according to claim 1, characterized in that: Also included is a control component, which is connected to the fluid storage chamber and is used to control the volume of the fluid in the fluid storage chamber.

16. A lithium ion battery in-situ expansion test method for testing the expansion of a lithium ion battery, characterized in that: The following steps are involved: The lithium-ion battery is clamped by a clamping assembly, the clamping assembly comprising a first plate and a second plate; the second plate is arranged on the first plate, and a receiving space for accommodating the lithium-ion battery is arranged between the second plate and the first plate; the lithium-ion battery is arranged in the receiving space between the second plate and the first plate; An expansion test assembly is used to test the expansion of the lithium-ion battery in the clamping assembly, wherein the expansion test assembly is arranged on the clamping assembly, and the expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber; The fluid storage chamber is in contact with the top of the second plate body, and a fluid pressure sensor is arranged in the fluid pressure test chamber. During the test, when the lithium-ion battery arranged between the second plate body and the first plate body expands, the lithium-ion battery squeezes the second plate body to move the second plate body upward, and the upward movement of the second plate body causes the volume of the fluid storage chamber to change, so that the fluid in the fluid storage chamber is transmitted to the fluid pressure test chamber, and the fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test chamber.

17. The lithium ion battery in-situ expansion test method according to claim 16, characterized in that: Before testing the lithium-ion battery, the fluid pressure test chamber is inflated, and the fluid is transferred from the fluid pressure test chamber to the fluid storage chamber, thereby driving the second plate to pre-tighten the lithium-ion battery.

18. A lithium-ion battery in-situ expansion test device, characterized in that: Includes expansion test assembly; The expansion test assembly includes a fluid storage chamber and a fluid pressure test chamber connected to the fluid storage chamber; The fluid storage cavity is directly or indirectly connected to the lithium-ion battery, and a fluid pressure sensor is arranged in the fluid pressure test cavity. During the test, when the lithium-ion battery expands, the lithium-ion battery squeezes the fluid storage cavity to change the volume of the fluid storage cavity, so that the fluid in the fluid storage cavity is transmitted to the fluid pressure test cavity. The fluid pressure sensor measures the expansion of the lithium-ion battery by detecting the change of fluid pressure in the fluid pressure test cavity.

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