Internal resistance detection device
By using an internal resistance detection device that rotates the internal resistance detection component synchronously with the turntable, continuous detection and transfer of battery cells can be achieved, solving the problems of low efficiency and high cost in existing technologies, improving detection efficiency and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI HIGRAND ELECTRONICS TECH
- Filing Date
- 2025-04-16
- Publication Date
- 2026-05-08
AI Technical Summary
Existing internal resistance testing devices are inefficient and costly. The battery cell must be stationary during the testing process, which leads to low efficiency and increased costs.
Design an internal resistance detection device. By connecting the internal resistance detection component to a turntable and making them rotate synchronously, continuous detection and transfer of battery cells can be achieved. The probe component makes contact with the extreme points of the battery cell to detect the internal resistance, and unqualified battery cells are rejected during the transfer process.
It improves the efficiency and accuracy of battery cell testing, reduces production costs, enables continuous processing and production of battery cells, reduces the subsequent processing of unqualified battery cells, and improves production efficiency.
Smart Images
Figure CN224216853U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery testing technology, and more specifically, to an internal resistance testing device. Background Technology
[0002] To prevent defective products from entering subsequent processes and causing significant safety hazards, internal resistance testing is an essential part of battery production. Current methods typically use a single internal resistance testing device or a large number of additional mechanisms to test the internal resistance of the battery cells. Furthermore, the cells must be stationary during the testing process, which not only reduces testing efficiency but also increases testing costs. Utility Model Content
[0003] The present invention aims to solve the problems of low internal resistance detection efficiency and high detection cost of existing internal resistance detection devices.
[0004] To solve the above problems, this utility model provides an internal resistance detection device, comprising:
[0005] Feed end and discharge end;
[0006] A turntable, wherein a plurality of first cell fixtures are arranged circumferentially on the turntable, the turntable is used to transfer the first cell fixtures between the feed end and the discharge end, and the first cell fixtures are used to clamp the cells;
[0007] An internal resistance detection assembly is provided, wherein multiple internal resistance detection assemblies are connected to the turntable and can rotate synchronously with the turntable. Each internal resistance detection assembly is configured to correspond one-to-one with the first cell fixture. Each internal resistance detection assembly includes at least one probe assembly, which is disposed at the vertical end of the first cell fixture and can make contact with the extreme end of the cell to detect the internal resistance of the cell.
[0008] Furthermore, the internal resistance detection component includes two probe components, which are respectively disposed at both ends of the first cell fixture in the vertical direction. One probe component can contact the first end of the cell, and the other probe component can contact the second end of the cell. The polarities of the first end and the second end are opposite.
[0009] Furthermore, the internal resistance detection device also includes a rotating shaft and two detection turntables. The rotating shaft connects the two detection turntables and the turntable. The two detection turntables are respectively disposed at both ends of the turntable in the vertical direction. The two probe components in each internal resistance detection assembly are respectively disposed on the two detection turntables.
[0010] Furthermore, the internal resistance detection device also includes two transfer turntables, each with at least one second cell fixture; one transfer turntable is located between the feed end and the turntable, for transferring the cell from the feed end to the turntable, and the other transfer turntable is located between the discharge end and the turntable, for transferring the cell on the turntable to the discharge end.
[0011] Furthermore, the internal resistance detection device also includes a fixed plate, on which both the feed end and the discharge end are disposed. The fixed plate has a through hole for the transfer turntable to pass through. The fixed plate is provided with a first stop and a second stop. The first stop is disposed on the outer periphery of the turntable, and the second stop is disposed on the outer periphery of the transfer turntable. The first stop extends toward the second stop, so that the battery cell held by the first battery cell fixture or the second battery cell fixture can be located between the first stop and the second stop.
[0012] Furthermore, both the first and second stop edges are arc-shaped stop edges, and the first cell fixture can pass through the second stop edge. An avoidance notch is provided on the first stop edge so that the second cell fixture can pass through the first stop edge.
[0013] Furthermore, the probe assembly includes a support frame and a probe mounting base disposed on the support frame. The probe mounting base is provided with a probe, which includes a first probe and a second probe coaxially disposed. The second probe is sleeved outside the first probe. The first probe can move relative to the second probe in a vertical direction. An insulating element is disposed between the first probe and the second probe.
[0014] Furthermore, a first elastic element is sleeved on the first probe, one end of the first elastic element abuts against the first probe, and the other end of the first elastic element abuts against the insulating element; a second elastic element is sleeved on the second probe, one end of the second elastic element abuts against the second probe, and the other end of the second elastic element abuts against the probe mounting base.
[0015] Furthermore, the probe assembly also includes a second connecting block connected to the probe mounting base. The support frame includes a first connecting block and guide rods. Two guide rods are respectively connected to both ends of the first connecting block. The guide rods extend vertically toward the first cell fixture. Both ends of the second connecting block are respectively connected to the two guide rods. The second connecting block is located between the first connecting block and the probe mounting base. A linear bearing is sleeved on the end of the guide rod away from the first connecting block. A third elastic element is provided between the linear bearing and the second connecting block.
[0016] Furthermore, the internal resistance detection device also includes at least one cam, which is coaxially arranged with the turntable. A cam follower is provided on the first connecting block. The cam has a groove for guiding the cam follower to reciprocate in the vertical direction, and the cam follower is disposed in the groove.
[0017] The internal resistance detection device of this invention connects the internal resistance detection component to a turntable, allowing the component to rotate synchronously with the turntable. This enables the internal resistance detection component to rotate synchronously with the first cell fixture and the cell on the turntable, maintaining a relatively stationary state between the component and the cell. Simultaneously, while the turntable transports the cell, the probe component in the internal resistance detection component makes extreme contact with the cell to detect its internal resistance. This eliminates the need to pause the first cell fixture and the cell during internal resistance detection, enabling continuous detection and transport of cells, thus improving detection efficiency. Furthermore, cells failing the internal resistance test can be preemptively removed during transport, preventing further processing and reducing production costs. In addition, the loading end allows for better integration with the previous process, and the unloading end allows for better integration with the next process. By incorporating loading and unloading ends into the internal resistance detection device, continuous processing and production of cells can be achieved, further improving production efficiency. Attached Figure Description
[0018] Figure 1 This is a three-dimensional structural diagram of the internal resistance detection device provided in the embodiments of this utility model;
[0019] Figure 2 This is a front view of the internal resistance detection device provided in the embodiments of this utility model.
[0020] Figure 3 This is a schematic diagram of the internal resistance detection component provided in this embodiment of the present invention for detecting the internal resistance of the battery cell;
[0021] Figure 4 This is a schematic diagram of the probe assembly provided in the embodiments of this utility model;
[0022] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure;
[0023] Figure 6 This is a schematic diagram of the probe structure provided in the embodiments of this utility model;
[0024] Figure 7 for Figure 1 A partial structural diagram;
[0025] Figure 8 for Figure 7 A partial structural diagram;
[0026] Figure 9 This is a schematic diagram of the structure of the feed end transferring the battery cell to the central turntable in an embodiment of this utility model. Detailed Implementation
[0027] The technical solution of this utility model will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. Moreover, in the description of this utility model, "at least one" means one or more, unless otherwise explicitly specified.
[0028] In this specification, the term "as an alternative embodiment" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one alternative embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0029] Combination Figure 1 and Figure 2 As shown, this embodiment provides an internal resistance detection device, including: a frame 1 and an inlet end 10, an outlet end 20, a turntable 30, and an internal resistance detection assembly disposed on the frame 1, wherein:
[0030] The turntable 30 is provided with a plurality of first cell fixtures 31 in the circumferential direction. The turntable 30 is used to transfer the first cell fixtures 31 between the feed end 10 and the discharge end 20. The first cell fixtures 31 are used to clamp the cell 100.
[0031] Multiple internal resistance detection components are connected to the turntable 30. The internal resistance detection components can rotate synchronously with the turntable 30. The number of internal resistance detection components is the same as the number of the first cell fixture 31, and the internal resistance detection components are arranged in a one-to-one correspondence with the first cell fixture 31. The internal resistance detection component includes at least one probe component 50. The probe component 50 is disposed at the end of the first cell fixture 31 in the vertical direction. The probe component 50 can contact the extreme end of the cell 100 to detect the internal resistance of the cell 100.
[0032] The internal resistance detection device provided in this embodiment connects the internal resistance detection component to a turntable. The internal resistance detection component rotates synchronously with the turntable, enabling synchronous rotation of the internal resistance detection component, the first cell fixture, and the cell on the turntable. This keeps the internal resistance detection component and the cell relatively stationary, allowing the probe component in the internal resistance detection component to make extreme contact with the cell while the turntable is transporting the cell, thus detecting the cell's internal resistance. This eliminates the need to pause the first cell fixture and the cell during the internal resistance detection process, enabling continuous detection and transport of cells, improving detection efficiency. Furthermore, cells that fail the internal resistance test can be preemptively removed during transport, avoiding further processing of defective cells and reducing production costs. In addition, the loading end allows for better integration with the previous process, and the unloading end allows for better integration with the next process. By incorporating loading and unloading ends into the internal resistance detection device, continuous processing and production of cells can be achieved, further improving production efficiency.
[0033] Based on the above embodiments, as an optional implementation method, combined with Figure 3 and Figure 5 As shown, each internal resistance detection component includes two probe components 50, which are respectively disposed at both ends of the first cell fixture 31 along the vertical direction. That is, one probe component 50 is disposed above and one below the first cell fixture 31. One probe component 50 can contact the first terminal (positive terminal) of the cell 100, and the other probe component 50 can contact the second terminal (negative terminal) of the cell 100. Thus, by having the two probe components 50 contact the positive and negative terminals of the cell 100 respectively, the accuracy of the internal resistance detection of the cell 100 can be improved.
[0034] Based on the above embodiments, as an optional implementation, the internal resistance detection device further includes a rotating shaft 32 and two detection turntables 33. The two detection turntables 33 are respectively disposed at both ends of the turntable 30 in the vertical direction. The two probe assemblies 50 in each internal resistance detection assembly are respectively disposed on the two detection turntables 33. The two detection turntables 33 and the turntable 30 are connected by the rotating shaft 32. Specifically, the probe assembly 50 located above the first cell fixture 31 is named the first probe assembly, the probe assembly located below the first cell fixture 31 is named the second probe assembly, the detection turntable 33 located above the turntable 30 is named the first detection turntable, and the detection turntable 33 located below the turntable 30 is named the second detection turntable. The first probe assembly is disposed on the first detection turntable, and the second probe assembly is disposed on the second detection turntable. Therefore, when the rotating shaft 32 rotates, it can drive the turntable 30 and the two detection turntables 33 to rotate synchronously, so that the first cell fixture 31 and the two probe assemblies 50 rotate synchronously, keeping the two probe assemblies 50 and the cell 100 relatively stationary. In addition, the rotating shaft 32 connects the turntable 30 and the two detection turntables 33, making the turntable 30 and the two detection turntables 33 coaxially set, ensuring the coaxiality between the cell 100 and the two probe assemblies 50, which is beneficial to improving the accuracy of the probe assembly 50 in detecting the internal resistance of the cell 100.
[0035] Based on the above embodiments, as an optional implementation, in this embodiment, the two probe assemblies 50 have the same structure and are combined... Figure 4 As shown, the probe assembly 50 includes a support frame, a probe mounting base 52, and a second connecting block 53. The probe mounting base 52 is mounted on the support frame via the second connecting block 53, and a probe 51 is mounted on the probe mounting base 52. Specifically, the support frame includes a first connecting block 54 and guide rods 55. Two guide rods 55 are respectively connected to the two ends of the first connecting block 54 and extend vertically toward the first cell fixture 31. The two ends of the second connecting block 53 are respectively connected to the two guide rods 55. The second connecting block 53 is located between the first connecting block 54 and the probe mounting base 52. The probe mounting base 52 is fixedly connected to the second connecting block 53 via a connecting rod. The two guide rods 55 pass through the detection turntable 33, so that the probe assembly 50 is fixedly mounted on the detection turntable 33. The detection turntable 33 has a clearance notch for the probe 51 to perform internal resistance detection on the cell 100. Therefore, the probe mounting base 52 is set on the guide rod 55 by the second connecting block 53. The second connecting block 53 and the guide rod 55 can be connected by a threaded connection or other movable connection method, which makes it easy to adjust the height of the probe mounting base 52 and adjust the height of the probe 1. This allows the probe assembly 50 to be used with different sizes of battery cells 100, and the internal resistance detection device to be compatible with different sizes of battery cells 100.
[0036] Based on the above embodiments, as an optional implementation method, combined with Figure 4 and Figure 5 As shown, a cam follower 56 is provided on the first connecting block 54. A linear bearing 57 is sleeved on the end of the guide rod 55 away from the first connecting block 54. A third elastic element 58 is provided between the linear bearing 57 and the second connecting block 53. One end of the third elastic element 58 abuts against the second connecting block 53, and the other end of the third elastic element 58 abuts against the linear bearing 57. Therefore, by providing a linear bearing 57 on the guide rod 55, the support frame can move more smoothly in the vertical direction, which is beneficial to improving the structural stability of the probe assembly 50. This allows the probe 51 to move more smoothly in the vertical direction, which is beneficial to improving the accuracy of internal resistance detection. By sleeved a third elastic element 58 on the guide rod 55, the repeatability of the cam follower 56 is improved, and the reset of the probe 51 is also facilitated.
[0037] Based on the above embodiments, as an optional implementation method, combined with Figure 6 As shown, probe 51 includes a first probe 511 and a second probe 512 coaxially arranged. The second probe 512 is sleeved outside the first probe 511. The first probe 511 can move vertically relative to the second probe 512. An insulating member 513 is provided between the first probe 511 and the second probe 512. Specifically, the second probe 512 has an open hollow cavity, and the first probe 511 is housed within the hollow cavity. The first probe 511 and the second probe 512 are connected by the insulating member 513 to achieve an insulated connection between the first probe 511 and the second probe 512. Thus, by setting the first probe 511 and the second probe 512 coaxially arranged to detect the same end of the battery cell 100, the internal resistance of the battery cell 100 can be detected through current and voltage loops. Furthermore, by providing the insulating member 513 between the first probe 511 and the second probe 512, the true voltage of the battery cell 100 can be directly measured by physically isolating the current and voltage loops, eliminating the influence of wires and contact resistance, which is beneficial to further improving the accuracy of the internal resistance detection of the battery cell 100. As an alternative implementation, the insulating element 513 may be a polyurethane ring.
[0038] Based on the above embodiments, as an optional implementation, a first elastic member 514 is sleeved on the first probe 511. One end of the first elastic member 514 abuts against the first probe 511, and the other end of the first elastic member 514 abuts against the insulating member 513. Thus, the first elastic member 514 allows the first probe 511 and the second probe 512 to form a flexible connection, enabling the first probe 511 to move vertically relative to the second probe 512. This facilitates the reset of the first probe 511 and also provides cushioning during vertical movement, preventing damage to the smaller-diameter first probe 511 under overpressure. As an optional implementation, the first elastic member 514 can be a compression spring.
[0039] Based on the above embodiments, as an optional implementation, a second elastic member 515 is sleeved on the second probe 512. One end of the second elastic member 515 abuts against the second probe 512, and the other end of the second elastic member 515 abuts against the probe mounting base 52. Thus, the second elastic member 515 can reset the second probe 512, and the second elastic member 515 can adjust the height of the second probe 512 in the vertical direction. As an optional implementation, the second elastic member 515 can be a compression spring.
[0040] Those skilled in the art can use different shapes for the second probe 512 and the probe mounting base 52 in the two probe assemblies 50 according to the shape and size of the battery cell 100, but the structure and working principle of the two probe assemblies 50 are the same.
[0041] Based on the above embodiments, as an optional implementation method, combined with Figure 2As shown, the internal resistance detection device also includes two cams 60, which are mounted on the frame 1. The frame 1 and the cams 60 do not rotate with the rotating shaft 32. The two cams 60 are respectively mounted at both ends of the turntable 30 in the vertical direction. Both cams 60 are coaxially mounted with the turntable 30. Each of the two cams 60 has a groove for guiding the cam follower 56 to reciprocate in the vertical direction. The two probe assemblies 50 are respectively mounted in the two grooves, allowing the two probe assemblies 50 to move in the vertical direction. Specifically, the cam 60 located above the turntable 30 is named the upper cam, and the cam 60 located below the turntable 30 is named the lower cam. The upper cam is located above the first detection turntable, and the cam follower 56 of the first probe assembly is mounted in the groove of the upper cam, connecting the first probe assembly to the upper cam. The lower cam is located below the second detection turntable, and the cam follower 56 of the second probe assembly is mounted in the groove of the lower cam, connecting the second probe assembly to the lower cam. Therefore, when the probe assembly 50 rotates around the rotating shaft 32 via the cam follower 56 and the cam 60, the cam follower 56 can rotate along the groove, causing the cam follower 56 to drive the probe assembly 50 to rise and fall periodically in the vertical direction, thereby improving the accuracy of the repeatability of the probe assembly 50.
[0042] In this embodiment, the groove on the cam 60 has a height difference at different positions. This embodiment does not further limit the height difference. Those skilled in the art can set it according to the actual situation, as long as it can ensure that the two probe components 50 can contact the upper end and the lower end of the battery cell 100 respectively to detect the internal resistance of the battery cell 100.
[0043] Based on the above embodiments, as an optional implementation method, combined with Figure 7 As shown, the internal resistance detection device also includes two intermediate turntables 70, each rotatable around its own axis. At least one second cell fixture 71 is mounted on each intermediate turntable 70. One intermediate turntable 70 is positioned between the feed end 10 and the turntable 30, used to transfer the cell 100 from the feed end 10 to the turntable 30. The other intermediate turntable 70 is positioned between the discharge end 20 and the turntable 30, used to transfer the cell on the turntable 30 to the discharge end 20. Therefore, by setting intermediate turntables 70 between the feed end 10 and the turntable 30, and between the discharge end 20 and the turntable 30, automatic transfer of the cell 100 can be achieved, improving the conveying efficiency of the cell 100. Furthermore, the intermediate turntables 70 can buffer the cell 100, enabling individual detection of the cell 100's internal resistance, avoiding missed or duplicate detections, and improving the efficiency and accuracy of the detection.
[0044] Based on the above embodiments, as an optional implementation method, combined with Figures 7 to 9As shown, the internal resistance detection device also includes a fixed plate 80. The feed end 10 and the discharge end 20 are both set on the fixed plate 80. The fixed plate 80 has a through hole for the transfer turntable 70 to pass through. The fixed plate 80 is provided with a first baffle 81 and a second baffle 82. The first baffle 81 is set on the outer periphery of the turntable 30, and the second baffle 82 is set on the outer periphery of the transfer turntable 70. The first baffle 81 extends toward the second baffle 82, so that the battery cell 100 held by the first battery cell fixture 31 or the second battery cell fixture 71 can be located between the first baffle 81 and the second baffle 82. Therefore, by setting the first baffle 81 and the second baffle 82, when the battery cell 100 is located between the first baffle 81 and the second baffle 82, the battery cell 100 can be transferred between the first battery cell fixture 31 and the second battery cell fixture 71, so as to realize the transfer of the battery cell 100 at the feed end 10 to the turntable 30, or the transfer of the battery cell on the turntable 30 to the discharge end 20.
[0045] Based on the above embodiments, as an optional implementation, both the first baffle 81 and the second baffle 82 are arc-shaped baffles, allowing the first cell fixture 31 to pass through the second baffle 82. The first baffle 81 has an clearance notch, allowing the second cell fixture 71 to pass through the first baffle 81. Thus, the first cell fixture 31 and the second cell fixture 71 do not interfere with each other when rotating, avoiding affecting the transport of the cell 100. As an optional implementation, both the first cell fixture 31 and the second cell fixture 71 are magnetic cell fixtures, both magnetically attracting the cell 100. The first cell fixture 31 has a clearance between it for the second baffle 82 to pass through, and the height of the second cell fixture 71 is lower than that of the first baffle 81.
[0046] Based on the above embodiments, as an optional implementation, the internal resistance detection device further includes a drive component 2, an electric slip ring 3, an internal resistance detector 4, and a relay 5 mounted on the frame 1. The drive component 2 is located below the turntable 30 and is connected to the rotating shaft 32, and is used to drive the rotating shaft 32 to rotate. The electric slip ring 3, the internal resistance detector 4, and the relay 5 are all located below the fixed plate 80. Power is supplied to the turntable 30 through the electric slip ring 3 to power the internal resistance detection device, avoiding wire tangling or breakage. The internal resistance detector 4 and the relay 5 are both connected to the probe assembly 50. When detecting internal resistance, the detection line first passes through the relay 5 and then enters the internal resistance detector 4, which can avoid data fluctuation and affect the accuracy of the detection results.
[0047] Based on the above embodiments, as an optional implementation, the feed end 10 and the discharge end 20 can be belt conveyors for transporting battery cells. Those skilled in the art can also select other commonly used conveying devices according to actual conditions.
[0048] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.
Claims
1. An internal resistance detection device, characterized in that, include: Feed end and discharge end; A turntable, wherein a plurality of first cell fixtures are arranged circumferentially on the turntable, the turntable is used to transfer the first cell fixtures between the feed end and the discharge end, and the first cell fixtures are used to clamp the cells; An internal resistance detection assembly is provided, wherein multiple internal resistance detection assemblies are connected to the turntable and can rotate synchronously with the turntable. Each internal resistance detection assembly is configured to correspond one-to-one with the first cell fixture. Each internal resistance detection assembly includes at least one probe assembly, which is disposed at the vertical end of the first cell fixture and can make contact with the extreme end of the cell to detect the internal resistance of the cell.
2. The internal resistance detection device according to claim 1, characterized in that, The internal resistance detection component includes two probe components, which are respectively disposed at both ends of the first cell fixture in the vertical direction. One probe component can contact the first end of the cell, and the other probe component can contact the second end of the cell. The polarities of the first end and the second end are opposite.
3. The internal resistance detection device according to claim 2, characterized in that, The internal resistance detection device also includes a rotating shaft and two detection turntables. The rotating shaft connects the two detection turntables and the turntable. The two detection turntables are respectively disposed at both ends of the turntable in the vertical direction. The two probe components in each internal resistance detection assembly are respectively disposed on the two detection turntables.
4. The internal resistance detection device according to claim 1, characterized in that, The internal resistance detection device also includes two transfer turntables, and at least one second cell fixture is provided on the transfer turntables; One of the transfer turntables is disposed between the feed end and the turntable, for transferring the battery cells from the feed end to the turntable; the other transfer turntable is disposed between the discharge end and the turntable, for transferring the battery cells on the turntable to the discharge end.
5. The internal resistance detection device according to claim 4, characterized in that, The internal resistance detection device also includes a fixing plate. The feeding end and the discharging end are both disposed on the fixing plate. The fixing plate has a through hole for the transfer turntable to pass through. The fixing plate is provided with a first stop and a second stop. The first stop is disposed on the outer periphery of the turntable, and the second stop is disposed on the outer periphery of the transfer turntable. The first stop extends toward the second stop, so that the battery cell held by the first battery cell fixture or the second battery cell fixture can be located between the first stop and the second stop.
6. The internal resistance detection device according to claim 5, characterized in that, Both the first and second stop edges are arc-shaped. The first cell fixture can pass through the second stop edge. An avoidance notch is provided on the first stop edge so that the second cell fixture can pass through the first stop edge.
7. The internal resistance detection device according to claim 1, characterized in that, The probe assembly includes a support frame and a probe mounting base disposed on the support frame. The probe mounting base is provided with a probe, which includes a first probe and a second probe arranged coaxially. The second probe is sleeved outside the first probe. The first probe can move vertically relative to the second probe. An insulating element is provided between the first probe and the second probe.
8. The internal resistance detection device according to claim 7, characterized in that, The first probe is fitted with a first elastic element, one end of which abuts against the first probe and the other end of which abuts against the insulating element; the second probe is fitted with a second elastic element, one end of which abuts against the second probe and the other end of which abuts against the probe mounting base.
9. The internal resistance detection device according to claim 7, characterized in that, The probe assembly further includes a second connecting block connected to the probe mounting base. The support frame includes a first connecting block and guide rods. Two guide rods are respectively connected to both ends of the first connecting block. The guide rods extend vertically toward the first cell fixture. Both ends of the second connecting block are respectively connected to the two guide rods. The second connecting block is located between the first connecting block and the probe mounting base. A linear bearing is sleeved on the end of the guide rod away from the first connecting block. A third elastic element is provided between the linear bearing and the second connecting block.
10. The internal resistance detection device according to claim 9, characterized in that, The internal resistance detection device further includes at least one cam, which is coaxially arranged with the turntable. A cam follower is provided on the first connecting block. The cam has a groove that guides the cam follower to reciprocate in the vertical direction, and the cam follower is disposed in the groove.