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. And the lithium ion battery is arranged in the clamping assembly. The detection assembly is used for detecting expansion data of the lithium ion battery. The clamping assembly comprises a first plate body and a second plate body. And the lithium ion battery is arranged between the second plate body and the first plate body. A first notch is formed in the first plate body, a second notch is formed in the second plate body, and the fixing column is assembled to the first plate body from the first notch and fixedly connected with the first plate body. The fixing column is assembled to the second plate body from the second notch so that the second plate body can move up and down along the fixing column. And by arranging the first notch and the second notch, installation between the fixing column and the first plate body and the second plate body is more convenient.

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] A common lithium-ion battery expansion testing device generally includes a first plate, a third plate, and a second plate. The lithium-ion battery is placed between the second plate and the first plate, and the expansion data of the lithium-ion battery during operation is detected by a pressure sensor provided on the second plate or the first plate. Screw holes are provided on the first plate, the third plate, and the second plate, and the three are fixed together by a screw structure passing through the screw holes. In the actual assembly process, since the first plate, the third plate, and the second plate are relatively large in volume and are basically made of metal, the first plate, the third plate, and the second plate are relatively heavy and difficult to move. Therefore, when the assembly method of using a screw structure passing through the screw holes is adopted, the assembly process becomes particularly difficult when the weight of the first plate, the third plate, and the second plate is relatively large. Utility Model Content

[0005] The main purpose of the present application is to provide an in-situ expansion test device for lithium-ion batteries, so as to solve the problem that the in-situ expansion test device for lithium-ion batteries in the prior art is difficult to assemble due to its heavy weight.

[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 clamping assembly includes a first plate and a second plate, and the lithium-ion battery is arranged between the second plate and the first plate;

[0008] A first notch is provided on the first plate body, a second notch is provided on the second plate body, and a third notch is provided on the third plate body. The fixing column is assembled to the first plate body from the first notch and is fixedly connected to the first plate body. The fixing column is assembled to the third plate body from the third notch and is fixedly connected to the third plate body. The fixing column is assembled to the second plate body from the second notch so that the second plate body moves up and down along the fixing column.

[0009] In one embodiment, the clamping assembly also includes a third plate body, the first plate body, the second plate body and the third plate body are connected together by a fixing column, a third notch is provided on the third plate body, and the fixing column is assembled to the third plate body from the third notch and is fixedly connected to the third plate body.

[0010] In one embodiment, there are two or more first notches, and two or more first notches are arranged around the first plate; there are two or more second notches, and two or more second notches are arranged around the second plate; there are two or more third notches, and two or more third notches are arranged around the third plate; the positions of the first notch, the second notch, and the third notch correspond one to one, so that the fixing column passes through the first notch, the second notch, and the third notch in sequence to fix the first plate, the second plate, and the third plate together.

[0011] In one embodiment, there are four first notches, and the four first notches are respectively set at the four corners of the first plate body; there are four second notches, and the four second notches are respectively set at the four corners of the second plate body; there are four third notches, and the four third notches are respectively set at the four corners of the third plate body.

[0012] In one embodiment, the fixing column has a first end and a second end, the first end of the fixing column has a first screw, the first screw is used to fix the first end of the fixing column to the first plate body, and the second end of the fixing column has a second screw, the second screw is used to fix the second end of the fixing column to the third plate body.

[0013] In one embodiment, the size of the first end of the fixing post is smaller than the size of the first notch, so that the first end of the fixing post is disposed in the first notch;

[0014] The size of the second end of the fixing post is smaller than the size of the third notch, so that the second end of the fixing post is disposed in the third notch;

[0015] The size of the middle portion of the fixing column is larger than the size of the first notch to form a first step portion, and the first screw and the first step portion jointly clamp the first plate, thereby fixing the fixing column and the first plate together;

[0016] The size of the middle part of the fixing column is larger than the size of the third notch to form a second step portion, and the second screw and the second step portion jointly clamp the third plate body, thereby fixing the fixing column and the third plate body together.

[0017] In one embodiment, the size of the middle portion of the fixing column is smaller than the size of the second notch, so that the second plate can be movably disposed on the fixing column.

[0018] In one embodiment, the lithium-ion battery in-situ expansion testing device further comprises:

[0019] The first locking member is provided on the first notch. When the fixing post is installed in the first notch, the first locking member closes the first notch to fix the fixing post inside the first notch.

[0020] In one embodiment, the lithium-ion battery in-situ expansion testing device further comprises:

[0021] The second locking member is provided on the second notch. When the fixing post is installed in the second notch, the second locking member closes the second notch to fix the fixing post inside the second notch.

[0022] In one embodiment, the lithium-ion battery in-situ expansion testing device further comprises:

[0023] The third locking member is provided on the third notch. When the fixing post is installed in the third notch, the third locking member closes the third notch to fix the fixing post inside the third notch.

[0024] In one embodiment, the first locking member includes a first locking tongue and a first elastic member, the first locking tongue is retractably arranged on the first notch by the first elastic member, the first locking tongue has a first setting position and a second setting position, when the first locking tongue is set in the first setting position, the first notch is opened to install the fixing post, and when the first locking tongue is set in the second setting position, the first notch is closed to accommodate the fixing post in the first notch;

[0025] The second locking member includes a second locking tongue and a second elastic member. The second locking tongue is retractably arranged on the second notch by the second elastic member. The second locking tongue has a third setting position and a fourth setting position. When the second locking tongue is set to the third setting position, the second notch is opened to install the fixing post. When the second locking tongue is set to the fourth setting position, the second notch is closed to accommodate the fixing post in the second notch.

[0026] The third locking member includes a third locking tongue and a third elastic member. The third locking tongue is telescopically arranged on the third notch through the third elastic member. The third locking tongue has a fifth setting position and a sixth setting position. When the third locking tongue is set at the fifth setting position, the third notch is opened to install the fixing column. When the third locking tongue is set at the sixth setting position, the third notch is closed to accommodate the fixing column in the third notch.

[0027] Another 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;

[0028] The clamping assembly includes a first plate and a second plate, and the lithium-ion battery is arranged between the second plate and the first plate;

[0029] A first screw hole is provided on the first plate body, and a second notch is provided on the second plate body. The fixing column is assembled to the first plate body through the first screw hole and is fixedly connected to the first plate body. The fixing column is assembled to the second plate body through the second notch so that the second plate body can move up and down along the fixing column.

[0030] In the lithium-ion battery in-situ expansion testing device provided in the present application, by providing a first notch on the first plate and a second notch on the second plate, when a fixing post is used to fix the first and second plates together, the fixing post can be assembled to the first plate from the first notch and fixedly connected to the first plate, and assembled to the second plate from the second notch, so that the second plate can move up and down along the fixing post. Compared to the traditional screw + screw hole connection method, the lithium-ion battery in-situ expansion testing device provided in the present application does not require large-scale movement of the first and second plates to complete the entire assembly process. During the assembly process, it is only necessary to fix the relative positions of the first and second plates, then install the fixing post from the side into the first and second notches, and then fix the fixing post to the first plate to complete the assembly of the lithium-ion battery in-situ expansion testing device. In other words, the provision of the first and second notches makes the assembly of the lithium-ion battery in-situ expansion testing device more convenient and easy to operate. 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 three-dimensional diagram of the lithium-ion battery in-situ expansion test device after removing the detection components;

[0034] Figure 3 for Figure 1 Front view schematic diagram of the in-situ expansion test device for lithium-ion batteries;

[0035] Figure 4 for Figure 1 A schematic top view of an in-situ expansion test apparatus for lithium-ion batteries;

[0036] Figure 5 for Figure 4 A cross-sectional view of the in-situ expansion test device for lithium-ion batteries along the AA direction;

[0037] Figure 6 for Figure 5 A cross-sectional view of the fixing column in FIG.

[0038] Figure 7A schematic structural diagram of a first plate body provided in another embodiment of the present application;

[0039] Figure 8 A schematic structural diagram of a second plate provided in another embodiment of the present application;

[0040] Figure 9 A schematic structural diagram of a third plate body provided in another embodiment of the present application. 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] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, 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. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, technology, methods and equipment should be considered as 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 numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0044] See Figures 1 to 5 One embodiment of the present application provides an in-situ expansion testing device 100 for a lithium-ion battery. The in-situ expansion testing device 100 for a lithium-ion battery includes a clamping assembly 110 and a detection assembly 120. A lithium-ion battery is disposed within the clamping assembly 110. The detection assembly 120 is configured to detect expansion data of the lithium-ion battery. In this embodiment, the detection assembly 120 includes a cylinder 121 and a detection cavity 122 connected to the cylinder 121. An air pressure sensor is disposed within the detection cavity 122.

[0045] The clamping assembly 110 includes a first plate 111 and a second plate 112 . The lithium-ion battery is disposed between the second plate 112 and the first plate 111 .

[0046] The first plate 111 is provided with a first notch 1111. The second plate 112 is provided with a second notch 1121. The fixing post 114 is assembled to the first plate 111 through the first notch 1111 and is fixedly connected to the first plate 111. The fixing post 114 is assembled to the second plate 112 through the second notch 1121, allowing the second plate 112 to move up and down along the fixing post 114.

[0047] In the lithium-ion battery in-situ expansion testing device 100 provided herein, by providing a first notch 111 on the first plate 111 and a second notch 1121 on the second plate 112, when the first and second plates 111, 112 are secured together using fixing posts 114, the fixing posts 114 can be assembled to the first plate 111 through the first notch 1111, thereby being fixedly connected to the first plate 111, and then assembled to the second plate 112 through the second notch 1121, thereby allowing the second plate 112 to move up and down along the fixing posts 114. Compared to the traditional screw-and-thread connection method, the lithium-ion battery in-situ expansion testing device 100 provided herein does not require extensive movement of the first and second plates 111, 112, to complete the entire assembly process. During assembly, the first and second plates 111, 112, need only be fixed relative to each other, and then the fixing posts 114 can be installed from the side into the first and second notches 1111, 1121. That is, the provision of the first notch 1111 and the second notch 1121 makes the assembly of the lithium-ion battery in-situ expansion testing device 100 more convenient and easier to operate.

[0048] In one embodiment, the clamping assembly further includes a third plate 113. The first plate 111, the second plate 112, and the third plate 113 are connected together via a fixing post 114. The third plate 113 is provided with a third notch 1131. The fixing post 114 is assembled to the third plate 113 through the third notch 1131 and is fixedly connected to the third plate 113. In this embodiment, the provision of the third notch 1131 in the third plate 113 further facilitates the installation of the fixing post 114 and the third plate 113.

[0049] In this embodiment, the first plate 111, the second plate 112, and the third plate 113 are all steel plates with a quadrilateral shape. As needed, the first plate 111, the second plate 112, and the third plate 113 can also be made of other materials, and their shapes are not limited to quadrilaterals, as long as they can achieve the purpose of clamping the lithium-ion battery.

[0050] In one embodiment, there are two or more first notches 1111, and the two or more first notches 1111 are arranged around the first plate 111. When there are two or more first notches 1111, the first notches 1111 are arranged symmetrically on the first plate 1111 as much as possible to ensure the stability of the assembly process. There are two or more second notches 1121, and the two or more second notches 1121 are arranged around the second plate 112. Similarly, when there are two or more second notches 1121, the second notches 1121 are arranged symmetrically on the second plate 1121 as much as possible to ensure the stability of the assembly process. There are two or more third notches 1131, and the two or more third notches 1131 are arranged around the third plate 113. Similarly, when there are two or more third notches 1131, the third notches 1131 are arranged symmetrically on the third plate 1131 as much as possible to ensure the stability of the assembly process. The positions of the first notch 1111, the second notch 1121, and the third notch 1131 correspond to each other, so that the fixing column 114 passes through the first notch 1111, the second notch 1121, and the third notch 1131 in sequence to fix the first plate 111, the second plate 112, and the third plate 113 together.

[0051] In this embodiment, there are four first notches 1111. These four first notches 1111 are respectively located at the four corners of the first plate 111. There are four second notches 1121. These four second notches 1121 are respectively located at the four corners of the second plate 112. There are four third notches 1131. These four third notches 1131 are respectively located at the four corners of the third plate 113.

[0052] In this embodiment, by providing the first notches 1111 at the four corners of the first plate 111 and the third notches 1131 at the four corners of the third plate 113, the connection between the first plate 111 and the third plate 113 becomes more stable when the four fixing posts 114 are used to fix the first plate 111 and the third plate 113. Similarly, by providing the second notches 1121 at the four corners of the second plate 112 and passing the fixing posts 114 through the second notches 1121, the up and down movement of the second plate 112 on the fixing posts 114 becomes smoother.

[0053] Please also see Figure 6 In one embodiment, the fixing post 114 has a first end 1141 and a second end 1142. The first end 1141 of the fixing post 114 has a first screw 1151. The first screw 1151 is used to fix the first end 1141 of the fixing post 114 to the first plate 111. The second end 1142 of the fixing post 114 has a second screw 1152. The second screw 1152 is used to fix the second end 1142 of the fixing post 114 to the third plate 113.

[0054] In this embodiment, the first end 1141 of the fixing post 114 is smaller than the first notch 1111, so that the first end 1141 of the fixing post 114 is disposed within the first notch 1111. Since the first end 1141 of the fixing post 114 is smaller than the first notch 1111, during assembly, the first end 1141 of the fixing post 114 can be easily inserted from the side into the first notch 1111 of the first plate 111, thereby completing the assembly process of the fixing post 114 and the first plate 111.

[0055] In this embodiment, the second end 1142 of the fixing post 114 is smaller than the third notch 1131, so that the second end 1142 of the fixing post 114 is disposed within the third notch 1131. Since the second end 1142 of the fixing post 114 is smaller than the third notch 1131, during assembly, the second end 1142 of the fixing post 114 can be easily inserted from the side into the third notch 1131 of the third plate 113, thereby completing the assembly process of the fixing post 114 and the third plate 113.

[0056] The middle portion of the fixing post 114 is larger than the first notch 1111, forming a first step 1143. The first screw 1151 and the first step 1143 jointly clamp the first plate 111, thereby securing the fixing post 114 to the first plate 111. In this embodiment, by making the middle portion of the fixing post 114 larger than the first notch 1111 to form the first step 1143, the first screw 1151 and the first step 1143 can jointly clamp the first plate 111 during assembly, securing the fixing post 114 to the first plate 111. In fact, by forming the first step 1143 on the fixing post 114, the alignment of the fixing post 114 and the first notch 1111 is more accurate when the fixing post 114 is installed from the side into the first notch 1111 of the first plate 111.

[0057] The middle portion of the fixing post 114 is larger than the third notch 1131, forming a second step 1144. The second screw 1152 and the second step 1144 jointly clamp the third plate 113, thereby securing the fixing post 114 to the third plate 113. In this embodiment, by making the middle portion of the fixing post 114 larger than the third notch 1131 to form the second step 1144, the second screw 1152 and the second step 1144 can jointly clamp the third plate 113 during assembly, securing the fixing post 114 to the third plate 113. In fact, forming the second step 1144 on the fixing post 114 facilitates more accurate alignment between the fixing post 114 and the third notch 1131 when the fixing post 114 is installed from the side into the third notch 1131 of the third plate 113.

[0058] In one embodiment, the size of the middle portion of the fixing post 114 is smaller than the size of the second notch 1121, so that the second plate 112 is movably disposed on the fixing post 114. In this embodiment, the size of the middle portion of the fixing post 114 is slightly smaller than the size of the second notch 1121, so that the second plate 112 can move up and down along the fixing post 114.

[0059] It is understandable that the lithium-ion battery in-situ expansion testing device 100 is not limited to the above embodiments.

[0060] See Figure 7In one embodiment, the lithium-ion battery in-situ expansion testing device 100 further includes a first locking member 130 .

[0061] The first locking member 130 is disposed on the first notch 1111. When the fixing post 114 is installed in the first notch 1111, the first locking member 130 closes the first notch 1111 to fix the fixing post 114 inside the first notch 1111.

[0062] In this embodiment, by providing the first locking member 130 and setting the first locking member 130 on the first notch 1111, when the fixing column 114 is installed in the first notch 1111, the first locking member 130 closes the first notch 1111 to fix the fixing column 114 inside the first notch 1111, thereby preventing the fixing column 114 from falling out of the first notch 1111, thereby affecting the stability of its assembly process.

[0063] In this embodiment, the first locking member 130 includes a first locking tongue 131 and a first elastic member 132. The first locking tongue 131 is retractably positioned in the first notch 1111 via the first elastic member 132. The first locking tongue 131 has a first setting position and a second setting position. When the first locking tongue 131 is in the first setting position, the first notch 1111 is open to accommodate the fixing post 114. When the first locking tongue 131 is in the second setting position, the first notch 1111 is closed to accommodate the fixing post 114 within the first notch 1111.

[0064] By configuring the first locking member 130 to include a first locking tongue 131 and a first elastic member 132, and by enabling the first locking tongue 131 to be retractably positioned in the first notch 1111 via the first elastic member 132, when the fixing post 114 is installed in the first notch 1111, the first elastic member 132 can be compressed, causing the first locking tongue 131 to be positioned in the first position. This allows the fixing post 114 to be easily assembled into the first notch 1111. After the fixing post 114 is assembled, the first locking tongue 131 can return to the second position due to the rebound action of the first elastic member 132, thereby closing the first notch 1111 and accommodating the fixing post 114 within the first notch 1111. Optionally, the first locking tongue 131 can be configured as an inclined surface. When the fixing post 114 is assembled into the first notch 1111, it can automatically compress the first locking tongue 131, causing the first notch 1111 to open. When the fixing post 114 is completely accommodated in the first notch 1111 , the first locking tongue 131 will automatically return to its original position due to the action of the first elastic member 132 , thereby closing the first notch 1111 .

[0065] See Figure 8 Similarly, in one embodiment, the lithium-ion battery in-situ expansion testing device 100 further includes a second locking member 140 .

[0066] The second locking member 140 is disposed on the second notch 1121 . When the fixing post 114 is installed in the second notch 1121 , the second locking member 140 closes the second notch 1121 to fix the fixing post 114 inside the second notch 1121 .

[0067] In this embodiment, by providing the second locking member 140 and arranging the second locking member 140 on the second notch 1121, when the fixing column 114 is installed in the second notch 1121, the second locking member 140 closes the second notch 1121 to fix the fixing column 114 inside the second notch 1121, thereby preventing the fixing column 114 from falling out of the second notch 1121, thereby affecting the stability of its assembly process.

[0068] In this embodiment, the second locking member 140 includes a second locking tongue 141 and a second elastic member 142. The second locking tongue 141 is retractably positioned in the second notch 1121 via the second elastic member 142. The second locking tongue 141 has a third and a fourth position. When the second locking tongue 141 is in the third position, the second notch 1121 is open to accommodate the fixing post 114. When the second locking tongue 141 is in the fourth position, the second notch 1121 is closed to accommodate the fixing post 114 within the second notch 1121.

[0069] By configuring the second locking member 140 to include a second locking tongue 141 and a second elastic member 142, and by enabling the second locking tongue 141 to be retractably positioned in the second notch 1121 via the second elastic member 142, when the fixing post 114 is installed in the second notch 1121, the second elastic member 142 can be compressed, causing the second locking tongue 141 to be positioned in the third position. This allows the fixing post 114 to be easily assembled into the second notch 1121. After the fixing post 114 is assembled, the rebound action of the second elastic member 142 causes the second locking tongue 141 to return to the fourth position, thereby closing the second notch 1121 and accommodating the fixing post 114 within the second notch 1121. Optionally, the second locking tongue 141 can be configured as an inclined surface. When the fixing post 114 is assembled into the second notch 1121, it automatically compresses the second locking tongue 141, opening the second notch 1121. When the fixing post 114 is completely accommodated in the second notch 1121 , the second locking tongue 141 will automatically return to its original position due to the action of the second elastic member 142 , thereby closing the second notch 1121 .

[0070] See Figure 9 In one embodiment, the lithium-ion battery in-situ expansion testing device 100 further includes a third locking member 150 .

[0071] The third locking member 150 is disposed on the third notch 1131 . When the fixing post 114 is installed in the third notch 1131 , the third locking member 150 closes the third notch 1131 to fix the fixing post 114 inside the third notch 1131 .

[0072] In this embodiment, by providing the third locking member 150 and arranging the third locking member 150 on the third notch 1131, when the fixing column 114 is installed in the third notch 1131, the third locking member 150 closes the third notch 1131 to fix the fixing column 114 inside the third notch 1131, thereby preventing the fixing column 114 from falling out of the third notch 1131, thereby affecting the stability of its assembly process.

[0073] In this embodiment, the third locking member 150 includes a third locking tongue 151 and a third elastic member 152. The third locking tongue 151 is retractably positioned in the third notch 1131 via the third elastic member 152. The third locking tongue 151 has a fifth and sixth positioning positions. When the third locking tongue 151 is in the fifth positioning position, the third notch 1131 is open to accommodate the fixing post 114. When the third locking tongue 151 is in the sixth positioning position, the third notch 1131 is closed to accommodate the fixing post 114 within the third notch 1131.

[0074] By configuring the third locking member 150 to include a third locking tongue 151 and a third elastic member 152, and by enabling the third locking tongue 151 to be retractably positioned in the third notch 1131 via the third elastic member 152, when the fixing post 114 is installed in the third notch 1131, the third elastic member 152 can be compressed, causing the third locking tongue 151 to be positioned in the fifth position. At this point, the fixing post 114 can be easily assembled into the third notch 1131. After the fixing post 114 is assembled, the third locking tongue 151 can return to the sixth position due to the rebound action of the third elastic member 152, thereby closing the third notch 1131 and accommodating the fixing post 114 within the third notch 1131. The third locking tongue 151 can be configured as an inclined surface as desired. When the fixing post 114 is assembled into the third notch 1131, the fixing post 114 can automatically squeeze the third locking tongue 151 to open the third notch 1131. When the fixing post 114 is completely accommodated in the third notch 1131, the third locking tongue 151 will automatically return to its original position due to the action of the third elastic member 152, closing the third notch 1131.

[0075] It is understood that the in-situ expansion test device for lithium-ion batteries is not limited to the above embodiments. Another embodiment of the present application provides an in-situ expansion test device for lithium-ion batteries, 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;

[0076] The clamping assembly includes a first plate and a second plate, and the lithium-ion battery is arranged between the second plate and the first plate;

[0077] A first screw hole is provided on the first plate body, and a second notch is provided on the second plate body. The fixing column is assembled to the first plate body through the first screw hole and is fixedly connected to the first plate body. The fixing column is assembled to the second plate body through the second notch so that the second plate body can move up and down along the fixing column.

[0078] In this embodiment, the first notch on the first plate is replaced with a first screw hole. During assembly, the fixing post can be first assembled to the first plate through the first screw hole and fixedly connected to the first plate. The fixing post can then be assembled to the third plate through the third notch and to the second plate through the second notch. This embodiment also facilitates installation of the fixing post.

[0079] Optionally, the clamping assembly further includes a third plate. The first plate, the second plate, and the third plate are connected together via a fixing post. The third plate is provided with a third notch. The fixing post is assembled into the third plate through the third notch and is fixedly connected to the third plate.

[0080] 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.

[0081] 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.

[0082] 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 clamping assembly includes a first plate, a second plate, and a fixing column, and the lithium-ion battery is arranged between the second plate and the first plate; A first notch is provided on the first plate body, and a second notch is provided on the second plate body. The fixing column is assembled to the first plate body from the first notch and is fixedly connected to the first plate body. The fixing column is assembled to the second plate body from the second notch so that the second plate body moves up and down along the fixing column.

2. The lithium-ion battery in-situ expansion testing device according to claim 1, characterized in that: The clamping assembly also includes a third plate body, the first plate body, the second plate body and the third plate body are connected together by a fixing column, a third notch is provided on the third plate body, and the fixing column is assembled to the third plate body from the third notch and is fixedly connected to the third plate body.

3. The lithium-ion battery in-situ expansion testing device according to claim 2, characterized in that: There are two or more first notches, and two or more first notches are arranged around the first plate; there are two or more second notches, and two or more second notches are arranged around the second plate; there are two or more third notches, and two or more third notches are arranged around the third plate; the positions of the first notches, the second notches, and the third notches correspond one to one, so that the fixing column passes through the first notch, the second notch, and the third notch in sequence to fix the first plate, the second plate, and the third plate together.

4. The lithium-ion battery in-situ expansion testing device according to claim 3, characterized in that: There are four first notches, which are respectively arranged at the four corners of the first plate; there are four second notches, which are respectively arranged at the four corners of the second plate; there are four third notches, which are respectively arranged at the four corners of the third plate.

5. The lithium-ion battery in-situ expansion testing device according to claim 2, characterized in that: The fixing column has a first end and a second end. The first end of the fixing column has a first screw, and the first screw is used to fix the first end of the fixing column and the first plate together. The second end of the fixing column has a second screw, and the second screw is used to fix the second end of the fixing column and the third plate together.

6. The lithium-ion battery in-situ expansion testing device according to claim 5, characterized in that: The size of the first end of the fixing post is smaller than the size of the first notch, so that the first end of the fixing post is disposed in the first notch; The size of the second end of the fixing post is smaller than the size of the third notch, so that the second end of the fixing post is disposed in the third notch; The size of the middle portion of the fixing column is larger than the size of the first notch to form a first step portion, and the first screw and the first step portion jointly clamp the first plate, thereby fixing the fixing column and the first plate together; The size of the middle part of the fixing column is larger than the size of the third notch to form a second step portion, and the second screw and the second step portion jointly clamp the third plate body, thereby fixing the fixing column and the third plate body together.

7. The lithium-ion battery in-situ expansion testing device according to claim 6, characterized in that: The size of the middle portion of the fixing column is smaller than the size of the second notch, so that the second plate body can be movably arranged on the fixing column.

8. The lithium-ion battery in-situ expansion testing device according to claim 2, characterized in that: Also includes: The first locking member is provided on the first notch. When the fixing post is installed in the first notch, the first locking member closes the first notch to fix the fixing post inside the first notch.

9. The lithium-ion battery in-situ expansion testing device according to claim 8, characterized in that: Also includes: The second locking member is provided on the second notch. When the fixing post is installed in the second notch, the second locking member closes the second notch to fix the fixing post inside the second notch.

10. The lithium-ion battery in-situ expansion testing device according to claim 9, characterized in that: Also includes: The third locking member is provided on the third notch. When the fixing post is installed in the third notch, the third locking member closes the third notch to fix the fixing post inside the third notch.

11. The lithium-ion battery in-situ expansion testing device according to claim 10, characterized in that: The first locking member includes a first locking tongue and a first elastic member. The first locking tongue is retractably arranged on the first notch by the first elastic member. The first locking tongue has a first setting position and a second setting position. When the first locking tongue is set in the first setting position, the first notch is opened to install the fixing post. When the first locking tongue is set in the second setting position, the first notch is closed to accommodate the fixing post in the first notch. The second locking member includes a second locking tongue and a second elastic member. The second locking tongue is retractably arranged on the second notch by the second elastic member. The second locking tongue has a third setting position and a fourth setting position. When the second locking tongue is set to the third setting position, the second notch is opened to install the fixing post. When the second locking tongue is set to the fourth setting position, the second notch is closed to accommodate the fixing post in the second notch. The third locking member includes a third locking tongue and a third elastic member. The third locking tongue is telescopically arranged on the third notch through the third elastic member. The third locking tongue has a fifth setting position and a sixth setting position. When the third locking tongue is set at the fifth setting position, the third notch is opened to install the fixing column. When the third locking tongue is set at the sixth setting position, the third notch is closed to accommodate the fixing column in the third notch.

12. 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 clamping assembly includes a first plate, a second plate, and a fixing column, and the lithium-ion battery is arranged between the second plate and the first plate; A first screw hole is provided on the first plate body, and a second notch is provided on the second plate body. The fixing column is assembled to the first plate body through the first screw hole and is fixedly connected to the first plate body. The fixing column is assembled to the second plate body through the second notch so that the second plate body can move up and down along the fixing column.

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