Battery cell expansion testing device

Abstract

The utility model provides a battery cell expansion testing device, which comprises a connecting mechanism, the connecting mechanism comprises a first fixing plate, a second fixing plate and at least one fixing rod, the first fixing plate and the second fixing plate are connected through the fixing rod, an accommodating space is formed between the first fixing plate and the second fixing plate, and a battery cell to be tested is arranged in the accommodating space; the at least one detection mechanism comprises a detector and a sensor, the detector comprises a shell and a piston, a closed detection space is defined by the inner wall of the shell and the piston, and the sensor is arranged in the detection space. According to the battery cell expansion degree detection device, the mounting space is provided for the battery cell and the detection mechanism through the connecting mechanism, and then the at least one detection mechanism is in contact with the expansion surface of the battery cell, so that the expansion degree of the battery cell is detected, and the test result is visually fed back; the device has the remarkable advantages of being simple in structure, low in cost, convenient to manufacture and operate, accurate in detection, visual in result and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core expansion testing device. Background Art

[0002] With the vigorous development of the production and processing industry, the depletion of traditional energy and environmental problems are becoming increasingly serious. Based on this, lithium batteries are widely used in new energy vehicles, aerospace, communications and other fields due to their high energy density, long life and green environmental protection.

[0003] Batteries generally include battery cells, metal shells and top covers, among which battery cells are the basis for measuring battery performance. In the battery cell testing process, its cyclicity is a very necessary and important indicator for evaluating battery performance. The expansion data of the battery cell during the cycle is crucial to the analysis of the battery cell, cyclicity analysis and mechanical simulation of the module. Therefore, battery cell expansion monitoring is also one of the routine test items.

[0004] For the expansion test of the battery cells of conventional square batteries, the existing test tooling usually directly collects the pressure of the clamping plate when the battery cell expands by setting a high-precision pressure sensor on the clamping plate. When the battery cell is fully charged, the thickness of the battery cell expands, and when the battery cell is empty, the thickness of the battery cell shrinks. In the repeated process of expansion and shrinkage, the overall expansion degree of the battery cell gradually increases. The pressure of squeezing the clamping plate when the battery cell expands is converted into an electrical signal by the pressure sensor, and then exported after entering the computer through software to complete a test. However, the above-mentioned tooling can only be based on high-precision pressure sensors, which are relatively expensive, and during the test, it is difficult for operators to intuitively observe the degree of battery expansion. For some products that do not require precise testing, the existing tooling will reduce the detection efficiency and increase the detection cost. Therefore, how to explore a new type of battery cell expansion test device that is simple in structure, easy to operate, low in cost, and can observe the degree of battery cell expansion with the naked eye is the focus of the industry at this stage. Summary of the invention

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problems in the prior art that the detection of the expansion degree of the battery cell is not intuitive, the detection device is costly and the use is complicated, and provide a battery cell expansion test device.

[0006] In order to solve the above technical problems, the utility model provides a battery cell expansion testing device, which includes: a connecting mechanism, the connecting mechanism includes a first fixed plate, a second fixed plate and at least one fixed rod, the first fixed plate and the second fixed plate are connected by at least one of the fixed rods, and there is an accommodating space between the two, wherein the battery cell to be tested is arranged in the accommodating space; at least one detection mechanism, the detection mechanism includes a detector and a sensor, the detector is connected to the second fixed plate, and includes a shell and a piston, one end of the piston abuts against the battery cell to be tested, and the other end extends into the shell, the inner wall of the shell and the piston enclose a closed detection space, the sensor is arranged in the detection space, the piston can move along the expansion direction of the battery cell to be tested, the sensor can measure the pressure value of the detection space, and the pressure value of the detection space changes according to the moving distance of the piston.

[0007] In one embodiment of the present invention, the piston includes a push portion and a piston body, one side of the push portion is connected to the piston body, and the other side is in contact with the battery cell to be tested, and the cross-sectional area of ​​the push portion is larger than the cross-sectional area of ​​the piston body.

[0008] In one embodiment of the utility model, the connecting mechanism also includes a transmission plate, which is sleeved on the fixed rod and can move along the fixed rod, the battery cell to be tested is arranged between the first fixed plate and the transmission plate, the detection mechanism is arranged between the second fixed plate and the transmission plate, and the detection mechanism and the transmission plate are abutted against each other.

[0009] In one embodiment of the utility model, the length of the shell in the thickness direction of the battery cell to be tested is L, the length of the detection space in the same direction is X, and the range of X / L is 0.2-0.5, wherein X is the initial length of the detection space when not tested.

[0010] In one embodiment of the present invention, there are multiple detection mechanisms, and the multiple detection mechanisms are evenly distributed on the expansion surface of the battery cell to be tested.

[0011] In one embodiment of the present invention, the second fixing plate includes at least one first connecting hole, one of the detection mechanisms is correspondingly arranged in one of the first connecting holes, and the first connecting hole is penetrated along the thickness direction of the battery cell to be tested and connected to the second fixing plate.

[0012] In one embodiment of the utility model, the first connecting hole includes a first mounting hole and a second mounting hole, the first mounting hole and the second mounting hole are connected to each other, and the diameter of the second mounting hole is smaller than the diameter of the first mounting hole; wherein, the first mounting hole is arranged on a side close to the battery cell, and the second mounting hole is arranged on a side away from the battery cell; the detector also includes a fixed end, the fixed end is arranged at an end of the shell away from the battery cell to be tested, and is connected to the detection space, wherein part of the shell is arranged in the first mounting hole, and the fixed end is arranged in the second mounting hole.

[0013] In an embodiment of the present invention, the housing further comprises a sealing member, and the sealing member is disposed inside the fixed end to form the closed detection space.

[0014] In one embodiment of the present invention, the detection mechanism further includes a connecting wire, one end of which passes through the shell to connect to the sensor, and the other end of which is led out from the shell to transmit the pressure signal detected by the sensor.

[0015] In an embodiment of the present invention, a scale is provided on the surface of the shell.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The battery cell expansion testing device of the utility model provides installation space for the battery cell and the detection mechanism through a connecting mechanism, and then contacts the expansion surface of the battery cell through at least one detection mechanism, thereby detecting the expansion degree of the battery cell and intuitively feeding back the test result. Compared with the existing related detection devices, the present application has the significant advantages of simple structure, low cost, easy manufacturing, easy operation, accurate detection and intuitive results, and has broad application prospects in battery cell quality detection and related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of a battery cell expansion test device in a preferred embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the second fixed plate;

[0021] Figure 3 yes Figure 1 Schematic diagram of the structure of the testing agency;

[0022] Figure 4 yes Figure 2 A schematic cross-sectional view of the second fixing plate at AA;

[0023] Figure 5 It is a structural schematic diagram of a battery cell expansion test device in another embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the detection mechanism in the third embodiment of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the detection mechanism in the fourth embodiment of the utility model;

[0026] Figure 8 It is a structural schematic diagram of the detection mechanism in the fifth embodiment of the present utility model.

[0027] Explanation of the reference numerals in the specification: 100, connecting mechanism; 110, first fixing plate; 120, fixing rod; 130, second fixing plate; 131, first connecting hole; 1311, first mounting hole; 1312, second mounting hole; 132, second connecting hole; 140, transmission plate; 150, accommodating space; 200, detecting mechanism; 210, detector; 211, housing; 2111, scale; 212, piston; 2121, pushing part; 2122, piston body; 213, detecting space; 214, fixing end; 215, sealing member; 216, buckle; 220, sensor; 230, connecting wire; 300, battery cell. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] Embodiment 1

[0030] See also Figure 1As shown, this embodiment provides a battery cell 300 expansion test device, which includes: a connecting mechanism 100, the connecting mechanism 100 includes a first fixing plate 110, a second fixing plate 130 and at least one fixing rod 120, the first fixing plate 110 and the second fixing plate 130 are connected by at least one fixing rod 120, and there is an accommodating space 150 between the first fixing plate 110 and the second fixing plate 130, wherein the battery cell 300 to be tested is arranged in the accommodating space 150; at least one detection mechanism 200, the detection mechanism 200 includes a detector 210 and a sensor 220, The detector 210 is connected to the second fixed plate 130, and includes a shell 211 and a piston 212. One end of the piston 212 abuts against the battery cell 300 to be tested, and the other end extends into the shell 211. The inner wall of the shell 211 and the piston 212 enclose a closed detection space 213. The sensor 220 is arranged in the detection space 213. The piston 212 can move along the expansion direction of the battery cell 300 to be tested. The sensor 220 can measure the pressure value of the detection space 213. The pressure value of the detection space 213 changes according to the moving distance of the piston 212.

[0031] The battery cell 300 expansion test device provided in this embodiment provides installation space for the battery cell 300 and the detection mechanism 200 through the connection mechanism 100, and then contacts the expansion surface of the battery cell 300 through at least one detection mechanism 200, thereby detecting the expansion degree of the expansion surface of the battery cell 300 and intuitively feeding back the test results. Compared with the existing related detection devices, the present application has the significant advantages of simple structure, low cost, convenient manufacturing, easy operation, accurate detection and intuitive results, and has broad application prospects in battery cell 300 quality detection and related fields. Usually, the expansion surface of the battery cell 300 is the side with the largest area of ​​the battery cell 300. When the battery cell 300 is a long body structure, the side with the largest area is the side defined by the length and height of the rectangular structure.

[0032] See also Figure 1 and Figure 2As shown, in this embodiment, the first fixing plate 110 and the second fixing plate 130 are preferably two rectangular plates arranged in parallel, and the connecting mechanism 100 includes four fixing rods 120, and the same end of the four fixing rods 120 along the length direction is respectively inserted and connected to the four corners of the first fixing plate 110, and the other end is respectively inserted and connected to the four corners of the second fixing plate 130. Any fixing rod 120 extends along the height direction of the device, and the two ends of any fixing rod 120 are inserted and fixed in the first fixing plate 110 and the second fixing plate 130. The first fixing plate 110 and the second fixing plate 130 are spaced apart along the height direction of the device, and the four fixing rods 120, the first fixing plate 110 and the second fixing plate 130 jointly enclose a receiving space 150 for accommodating the battery cell 300 to be tested and the testing mechanism 200. Further, during use, the battery cell 300 to be tested is supported on the first fixed plate 110, and the expansion surface to be tested is placed toward the second fixed plate 130, and the detection mechanism 200 is in contact with the expansion surface of the battery cell 300 to be tested. When the battery cell 300 expands, its expansion surface will bulge toward the detection mechanism 200, thereby pushing the detection mechanism 200 at the corresponding position to achieve the purpose of detecting the expansion degree of the battery cell 300. In other embodiments, in order to improve the stability during the detection process, other numbers of fixing rods 120 can be set according to actual use requirements, and first fixing plates 110 and second fixing plates 130 of other shapes or materials can also be set, and the utility model does not make specific restrictions on this. Further, in this embodiment, the first fixing plate 110 and the fixing rod 120, and the second fixing rod 120 and the fixing rod 120 are connected by bolts. Based on this, the operator can change the spacing between the first fixing plate 110 and the second fixing plate 130 by adjusting the bolts, so that the device can be applied to more models of battery cell 300 tests.

[0033] See also Figure 2As shown, in this embodiment, the second fixing plate 130 includes at least one first connection hole 131 and at least one second connection hole 132, a detection mechanism 200 is correspondingly arranged in a first connection hole 131, a fixing rod 120 is correspondingly inserted in a second connection hole 132, and the first connection hole 131 and the second connection hole 132 are both penetrated and connected to the second fixing plate 130 along the thickness direction of the battery cell 300 to be tested. The expansion degree of the battery cell 300 at different locations on its expansion surface is different. Generally speaking, from the central area of ​​the expansion surface to the edge area, the expansion degree of the battery cell 300 gradually decreases, so the expansion degree of the central area of ​​the battery cell 300 is relatively large, and the expansion degree of the edge is relatively small. Therefore, in order to improve the accuracy of the detection of the device, the number of the detection mechanisms 200 in this embodiment is multiple, and the multiple detection mechanisms 200 are evenly distributed on the expansion surface of the battery cell 300 to be tested, so that the expansion degree of each specific position of the battery cell 300 can be more accurately known through the detection results of multiple detection mechanisms 200. Specifically, nine detection mechanisms 200 and four fixing rods 120 are provided in the present embodiment, and accordingly, nine first connection holes 131 and four second connection holes 132 are provided on the second fixing plate 130, and the nine first connection holes 131 are arranged in an array at the center of the second fixing plate 130. In other embodiments, the number and setting positions of the first connection holes 131 and the second connection holes 132 can be flexibly adjusted according to actual use requirements. Furthermore, the total area of ​​the nine detection mechanisms 200 in the present embodiment in contact with the battery cell 300 is not less than the area of ​​the raised part of the expansion surface of the battery cell 300, so that the expansion surface can be fully detected. Accordingly, in actual use, the operator can also adjust the setting position of the detection mechanism 200 to achieve directional detection of different areas of the expansion surface.

[0034] See also Figure 3 and Figure 4As shown, the detector 210 also includes a fixed end 214, which is arranged at one end of the shell 211 away from the battery cell 300 to be tested and is connected to the detection space 213, wherein a portion of the shell 211 is arranged in the first mounting hole 1311, and the fixed end 214 is arranged in the second mounting hole 1312. Accordingly, the first connecting hole 131 in this embodiment includes a first mounting hole 1311 and a second mounting hole 1312, the first mounting hole 1311 and the second mounting hole 1312 are connected to each other, and the diameter of the second mounting hole 1312 is smaller than the diameter of the first mounting hole 1311; wherein the first mounting hole 1311 is arranged on a side close to the battery cell 300, and the second mounting hole 1312 is arranged on a side away from the battery cell 300. Specifically, the second mounting hole 1312 is arranged at the center of the first mounting hole 1311, the diameter of the shell 211 on the side away from the battery cell 300 to be detected is the same as the diameter of the first mounting hole 1311, and the diameter of the fixed end 214 is the same as the diameter of the second mounting hole 1312. When the detection mechanism 200 is inserted and connected to the second fixing plate 130, the first mounting hole 1311 and the second mounting hole 1312 can respectively restrain the fixed end 214 and the shell 211, thereby ensuring that the position of the detection mechanism 200 in its length direction and the height direction of the device is restricted and fixed, thereby making the device have good stability in use.

[0035] In this embodiment, the length of the shell 211 in the thickness direction of the battery cell 300 to be tested is L, the length of the detection space 213 in the same direction is X, and the range of X / L is 0.2-0.5, wherein X is the initial length of the detection space 213 when it is not tested. During the use of the present device, the actual expansion degree of the battery cell 300 to be tested is related to the moving distance of the piston 212 in the detection mechanism 200, so the expansion degree of the battery cell 300 can be intuitively reflected through the movement process of the piston 212. Based on this, the length L of the shell 211 determines the moving range of the piston 212, and the length X of the detection space 213 needs to adapt to the change of the expansion degree of the battery cell 300. After comprehensively considering the actual battery cell 300 expansion degree experience value and the detection range of the detector 210, the present embodiment sets X / L to be maintained between 0.2-0.5, thereby ensuring that the piston 212 has a sufficient moving range and can be suitable for the expansion degree of the battery cell 300 during actual use, thereby maximizing the accuracy of the detection of the present device. Furthermore, in this embodiment, it is assumed that the length of the detection space 213 after the battery cell 300 expands is Y, and the actual expansion degree of the battery cell 300 is equal to XY.

[0036] In this embodiment, the piston 212 includes a push portion 2121 and a piston body 2122. One side of the push portion 2121 is connected to the piston body 2122, and the other side is in contact with the battery cell 300 to be tested. The cross-sectional area of ​​the push portion 2121 is larger than the cross-sectional area of ​​the piston body 2122. Based on this structure, the push portion 2121 with a larger cross-sectional area can more comprehensively cover the expansion surface of the battery cell 300 to be tested, thereby further improving the accuracy of the detection result of the device.

[0037] In this embodiment, the detection mechanism 200 also includes a connecting wire 230, one end of which passes through the housing 211 to connect to the sensor 220, and the other end is led out of the housing 211 to transmit the pressure signal detected by the sensor 220. In order to allow the connecting wire 230 to pass through the inside of the housing 211 so that it can be connected to an external signal receiving device such as a computer, while still maintaining a high degree of sealing of the detection space 213, the housing 211 also includes a sealing member 215, which is arranged inside the fixed end 214 to form a closed detection space 213. Specifically, the sealing member 215 is preferably a sealing glue. In other embodiments, the sealing member 215 can also be set as a sealing rubber, elastic silicone or other elements with a sealing effect, and the utility model does not make specific restrictions.

[0038] The specific detection process of the battery cell 300 expansion test device in this embodiment is described below:

[0039] First, before testing, the battery cell 300 to be tested needs to be placed in the testing space 213, and at the same time, ensure that the expansion surface to be tested is set toward the testing mechanism 200. After placement, the pistons 212 of multiple testing mechanisms 200 are in contact with the surface to be tested, and the battery to be tested is cyclically charged and discharged. During the repeated charging and discharging process, the battery cell 300 to be tested will expand, thereby causing the expansion surface to gradually bulge toward the multiple testing mechanisms 200, thereby pushing the piston 212 in the testing mechanism 200 to move along the shell 211 toward the testing space 213. In the process of the testing space 213 being gradually compressed, the internal air pressure gradually increases, thereby causing the detection value of the sensor 220 inside the testing space 213 to change, thereby reflecting the expansion of the battery cell 300 in real time.

[0040] Embodiment 2

[0041] See also Figure 5As shown, this embodiment provides another battery cell 300 expansion test device, and its detection process and principle are the same as those of the first embodiment, and no further details are given here. In this embodiment, the connecting mechanism 100 also includes a transmission plate 140, which is sleeved on the fixed rod 120 and can move along the fixed rod 120. The battery cell 300 to be tested is arranged between the first fixed plate 110 and the transmission plate 140, and the detection mechanism 200 is arranged between the second fixed plate 130 and the transmission plate 140, and the detection mechanism 200 and the transmission plate 140 are in contact with each other. Furthermore, after the battery cell 300 expands, it pushes the transmission plate 140, and after the transmission plate 140 moves along the fixed rod 120, it pushes multiple detectors 210 at the same time. This structural setting can ensure that the detector 210 can completely cover the expansion surface of the battery cell 300. At the same time, since the expansion degree of the surface of the battery cell 300 is different, its expansion limit depends on the most severely expanded part (mostly the center of the expansion surface). Therefore, the present application can monitor the expansion degree of different positions of the expansion surface from multiple angles through the transmission plate 140, thereby truly reflecting the expansion of the entire battery, and further refining the upper limit of the expansion of the battery cell 300.

[0042] Embodiment 3

[0043] See also Figure 6 As shown, the present embodiment provides another battery cell 300 expansion testing device, in which only the structure of the detection mechanism 200 is different from that in the first embodiment. Specifically, the sensor 220 in the present embodiment transmits signals via Bluetooth. Therefore, the present embodiment does not require the provision of a connecting wire 230 and related structures for the connecting wire 230 to pass through the shell 211, thereby simplifying the production cycle and cost.

[0044] Embodiment 4

[0045] See also Figure 7 As shown, this embodiment provides another battery cell 300 expansion test device, in which only the structure of the detection mechanism 200 is different from that in the first embodiment, specifically: a scale 2111 is provided on the surface of the shell 211, thereby further quantifying the test result. Furthermore, in this embodiment, the interval between two adjacent scales 2111 is in millimeters.

[0046] Embodiment 5

[0047] See also Figure 8 As shown, this embodiment provides another battery cell 300 expansion test device, in which only the structure of the detection mechanism 200 is different from that in the second embodiment, specifically: a buckle 216 is provided on the shell 211, and the buckle 216 is arranged around the shell 211 and connected to the second transmission plate 140. The arrangement of the buckle 216 can further improve the connection stability between the detection mechanism 200 and the second transmission plate 140, thereby ensuring the accuracy of the detection result.

[0048] In summary, the battery cell 300 expansion testing device of the utility model provides installation space for the battery cell 300 and the detection mechanism 200 through the connecting mechanism 100, and then contacts the expansion surface of the battery cell 300 through at least one detection mechanism 200, thereby detecting the expansion degree of the expansion surface of the battery cell 300 and intuitively feeding back the test results. Compared with the existing related detection devices, the present application has the significant advantages of simple structure, low cost, easy manufacturing, easy operation, accurate detection and intuitive results, and has broad application prospects in battery cell 300 quality inspection and related fields.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A battery cell expansion test device, characterized in that: include: A connecting mechanism (100), the connecting mechanism (100) comprising a first fixing plate (110), a second fixing plate (130) and at least one fixing rod (120), the first fixing plate (110) and the second fixing plate (130) being connected via at least one fixing rod (120), and an accommodating space (150) being provided between the first fixing plate (110) and the second fixing plate (130), wherein the battery cell (300) to be tested is arranged in the accommodating space (150); At least one detection mechanism (200), the detection mechanism (200) comprising a detector (210) and a sensor (220), the detector (210) being connected to the second fixing plate (130), comprising a shell (211) and a piston (212), one end of the piston (212) being in contact with the battery cell (300) to be tested, and the other end extending into the shell (211), the inner wall of the shell (211) and the piston (212) enclosing a closed detection space (213), the sensor (220) being arranged in the detection space (213), the piston (212) being movable along the expansion direction of the battery cell (300) to be tested, the sensor (220) being capable of measuring the pressure value of the detection space (213), and the pressure value of the detection space (213) changing according to the moving distance of the piston (212).

2. The battery cell expansion test device according to claim 1, characterized in that: The piston (212) comprises a pushing portion (2121) and a piston body (2122); one side of the pushing portion (2121) is connected to the piston body (2122), and the other side is in contact with the battery cell (300) to be tested; and the cross-sectional area of ​​the pushing portion (2121) is greater than the cross-sectional area of ​​the piston body (2122).

3. The battery cell expansion test device according to claim 1, characterized in that: The connecting mechanism (100) further comprises a transmission plate (140), wherein the transmission plate (140) is sleeved on the fixing rod (120) and can move along the fixing rod (120), the battery cell (300) to be tested is arranged between the first fixing plate (110) and the transmission plate (140), the detection mechanism (200) is arranged between the second fixing plate (130) and the transmission plate (140), and the detection mechanism (200) and the transmission plate (140) are in contact with each other.

4. The battery cell expansion test device according to claim 1, characterized in that: The length of the shell (211) in the thickness direction of the battery cell (300) to be tested is L, the length of the detection space (213) in the same direction is X, and the range of X / L is 0.2-0.5, wherein X is the initial length of the detection space (213) when not tested.

5. The battery cell expansion test device according to claim 1, characterized in that: There are a plurality of detection mechanisms (200), and the plurality of detection mechanisms (200) are evenly distributed on the expansion surface of the battery cell (300) to be tested.

6. The battery cell expansion test device according to claim 5, characterized in that: The second fixing plate (130) comprises at least one first connection hole (131), one of the detection mechanisms (200) is correspondingly arranged in one of the first connection holes (131), and the first connection hole (131) is penetrated along the thickness direction of the battery cell (300) to be tested and connected to the second fixing plate (130).

7. The battery cell expansion test device according to claim 6, characterized in that: The first connection hole (131) comprises a first mounting hole (1311) and a second mounting hole (1312), the first mounting hole (1311) and the second mounting hole (1312) are connected to each other, and the diameter of the second mounting hole (1312) is smaller than the diameter of the first mounting hole (1311); wherein the first mounting hole (1311) is arranged on a side close to the battery cell (300), and the second mounting hole (1312) is arranged on a side away from the battery cell (300); the detector (210) further comprises a fixed end (214), the fixed end (214) is arranged at an end of the shell (211) away from the battery cell (300) to be tested, and is connected to the detection space (213), wherein a portion of the shell (211) is arranged in the first mounting hole (1311), and the fixed end (214) is arranged in the second mounting hole (1312).

8. The battery cell expansion test device according to claim 7, characterized in that: The housing (211) further comprises a sealing member (215), wherein the sealing member (215) is arranged inside the fixed end (214) to form the sealed detection space (213).

9. The battery cell expansion test device according to claim 1, characterized in that: The detection mechanism (200) further comprises a connecting line (230), one end of which passes through the housing (211) to connect to the sensor (220), and the other end of which is led out from the housing (211) to transmit a pressure signal detected by the sensor (220).

10. The battery cell expansion test device according to claim 1, characterized in that: The surface of the housing (211) is provided with scales (2111).

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