Detection clamp and detection method adaptive to retired batteries of multiple specifications

Abstract

The invention discloses a detection fixture and a detection method adapted to retired batteries of multiple specifications, four clamping plates capable of synchronously moving are arranged in a detection box, the clamping plates can be independently adjusted through adjusting parts, and the clamping plates are driven to move through movement of an extrusion plate. The clamping plate and the extrusion plate are in driving connection through a toothed bar and a gear, a placement plate which moves along with upward movement of the extrusion plate is arranged in the detection box, the placement plate and the extrusion plate are driven by a driving piece, and the adjustable clamping assembly realizes synchronous rotation of a plurality of adjusting screw rods through a four-axis reverser. The clamping plates are driven to move synchronously, basic clamping requirements of batteries of different sizes can be rapidly met, meanwhile, an extrusion screw of the adjusting part is linked with a threaded cylinder, the single clamping plate can be finely adjusted independently by rotating a handle by unscrewing the extrusion screw, and a double-adjusting mode is achieved in cooperation with scale mark reference in the detection box. And the accuracy of clamping distance adjustment is greatly improved, and the device is suitable for more retired batteries of special specifications.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, specifically to a testing fixture and testing method adapted to retired batteries of various specifications. Background Technology

[0002] In the new energy battery recycling industry chain, the safety and performance testing of retired batteries is the core link to ensure the feasibility of cascade utilization. Due to differences in usage conditions, retired batteries may have problems such as internal structural damage, electrolyte leakage, and thermal runaway risks. Therefore, the testing process not only needs to accurately obtain conventional parameters such as voltage and capacity, but also needs to evaluate their safety performance through simulated working conditions such as extrusion. As the core carrier device for battery testing, the adaptability, stability, and safety of the testing fixture directly determine the reliability of the test results and the safety of the testing process.

[0003] While existing testing fixtures meet user needs to some extent, they still have certain shortcomings. Specifically, they lack adaptability to multiple specifications. Traditional fixtures are mostly fixed clamping structures, only compatible with a few battery specifications. Frequent fixture changes are required when dealing with different sizes and types of retired batteries, making operation cumbersome and inefficient, failing to meet the needs of large-scale testing. Furthermore, they have low automation; battery loading, positioning, clamping, and unloading processes rely heavily on manual operation, increasing labor intensity and increasing the risk of safety hazards due to human error. Additionally, existing testing fixtures operate independently, lacking a coordinated design, resulting in poor flow of the testing process and further reducing efficiency. Therefore, this invention designs a testing fixture and method adaptable to retired batteries of multiple specifications to solve these problems. Summary of the Invention

[0004] This invention provides a testing fixture and method for adapting to retired batteries of various specifications, which can effectively solve the problem of insufficient multi-specification adaptability mentioned in the background art. Traditional fixtures are mostly fixed clamping structures that can only adapt to a few specifications of batteries. When dealing with retired batteries of different sizes and types, the fixtures need to be changed frequently, which is cumbersome and inefficient, making it difficult to meet the needs of large-scale testing. Moreover, the degree of automation is low, and the processes of battery loading, positioning, clamping, and unloading rely heavily on manual operation, which not only increases labor intensity but also easily causes safety hazards due to human error. At the same time, the functional components of existing testing fixtures operate independently and lack linkage design, resulting in poor connection of the testing process and further reducing testing efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for detecting retired batteries, comprising: S1: Pre-test inspection: Inspect the connection and operation of the testing fixture, testing box, hydraulic rod, extrusion plate and box door; S2: Battery loading: Place the battery inside the testing box; S3: Battery clamping and detection: The hydraulic rod is activated to move the extrusion plate. The extrusion plate 3 is used to run the detection fixture to clamp the battery. The battery is detected as the extrusion plate continues to move. S4: Battery Removal: After the test is completed, as the extrusion plate moves up, the test fixture moves synchronously to separate the battery from the inner end face of the test box. After placing the battery for half an hour, open the box door to remove the battery.

[0006] A testing fixture adaptable to retired batteries of various specifications is provided. The testing box contains four synchronously movable clamping plates. Each clamping plate can be individually adjusted by an adjusting component. The clamping plates are moved by the movement of a pressing plate. The clamping plates and the pressing plate are connected by a rack and pinion. The testing box contains a placement plate that moves upward with the pressing plate. The placement plate and the pressing plate are driven by a driving component, which includes a driving rod, a fixed plate, a spring telescopic column, and a driving block.

[0007] A testing fixture adapted to retired batteries of various specifications, preferably, the testing box is provided with an adjustable clamping assembly, the adjustable clamping assembly including a four-axis commutator, an adjusting screw, an adjusting component, a moving plate, a clamping plate, scale lines, a rack, a gear and a rubber cylinder; The testing box is equipped with a four-axis commutator. Adjusting screws are evenly arranged on the outside of the four-axis commutator. Adjusting components are arranged on the outside of the adjusting screws. A movable plate is provided at one end of the adjusting component. A clamping plate is installed on the top of the movable plate by screws. Scale lines are evenly arranged inside the testing box. A toothed rod is installed at the bottom of the extrusion plate by screws. A rubber cylinder is rotatably connected to one end of the adjusting screw, and a gear is glued to the outside of the rubber cylinder.

[0008] A testing fixture adapted to retired batteries of various specifications, preferably, the adjusting component includes a threaded cylinder, a limiting block, a pressing screw, and a driving ring; The adjusting screw is connected to a threaded cylinder by a thread on its outer side. A limit block is rotatably connected to the outer side of the threaded cylinder. A pressing screw is connected to one end of the limit block by a thread on its inner side. A driving ring is fixedly connected to one end of the threaded cylinder. The driving ring is rotatably embedded and installed inside the moving plate.

[0009] A testing fixture adapted to retired batteries of various specifications, preferably, the testing box has a moving groove at the position of the limiting block, and the outer side of the limiting block is in contact with the inner wall of the moving groove.

[0010] A testing fixture adapted to retired batteries of various specifications, preferably wherein the end face of the extrusion screw is in contact with the end face of the threaded cylinder, and a rotating handle is fixedly connected to one end of the threaded cylinder.

[0011] A testing fixture adapted to retired batteries of various specifications, preferably wherein the rack and gear are positioned correspondingly, and the rack can mesh with the gear.

[0012] A testing fixture adapted to retired batteries of various specifications, preferably, the testing box is equipped with an automatic feeding assembly, the automatic feeding assembly including a moving column, a connecting plate, a placement plate, a magnetic plate, a driving rod, a fixed plate, a spring telescopic column, a driving block and an electric magnet; The inside of the detection box is uniformly connected with movable columns. The tops of the multiple movable columns are connected by a connecting plate, and the bottoms of the multiple movable columns are connected by a placement plate. Both ends of the placement plate are welded with a driving rod. Both ends of the bottom of the extrusion plate are fixed with screws. A spring telescopic column is installed inside the bottom of the fixed plate with screws. A driving block is installed at one end of the spring telescopic column with screws. Magnetic plates are fixedly connected inside the driving block, the placement plate, and the detection box. An electric magnet is fixedly connected at one end of the bottom of the fixed plate.

[0013] A testing fixture adapted to retired batteries of various specifications, preferably wherein the positions of the magnetic plates inside the driving block and inside the testing box correspond to each other, and the positions of the magnetic plates inside the placement plate and the electric magnets correspond to each other.

[0014] A testing fixture adapted to retired batteries of various specifications, preferably, has an inclined angle at the bottom of the driving block, and the top surface of the driving block can contact the bottom surface of the driving rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention has a scientific and reasonable structure and is safe and convenient to use: The adjustable clamping assembly realizes the synchronous rotation of multiple adjusting screws through a four-axis commutator, which drives the clamping plates to move synchronously. It can quickly adapt to the basic clamping requirements of batteries of different sizes. At the same time, the extrusion screw of the adjusting component is linked with the threaded cylinder. Loosening the extrusion screw allows for individual fine adjustment of a single clamping plate by rotating the handle. With the reference of the scale line inside the testing box, a dual adjustment mode is realized, which greatly improves the accuracy of clamping distance adjustment, adapts to more special specifications of retired batteries, eliminates the need for frequent clamp replacement, and significantly improves the versatility and efficiency of testing.

[0016] In the initial downward movement, the gear and rack mesh to drive the adjustable clamping assembly to synchronously clamp and fix the battery. After clamping, the downward movement continues, directly realizing the compression test of the battery. No additional drive mechanism or equipment switching is required, simplifying the testing process and reducing testing costs. During this process, the linkage friction design between the rubber cylinder and the adjusting screw allows the gear to idle during the compression stage without driving the adjusting screw to rotate, avoiding excessive clamping and damage to the battery, and ensuring the stability and safety of the compression test process.

[0017] The electric magnet of the automatic feeding component is linked with the magnetic plate to accurately move the placement plate to the inspection station and fix it, providing a stable foundation for subsequent clamping and positioning. After clamping, the electric magnet is de-energized and the spring telescopic column is reset, releasing the placement plate and pushing the drive block to reset, preparing for the subsequent unloading action. The whole process does not require manual intervention in battery positioning and fixing, reducing direct contact between operators and batteries, reducing safety risks, and improving the efficiency of automated connection of the inspection process.

[0018] After the test is completed, the hydraulic rod retracts, causing the extrusion plate to move upward, which is linked to the unloading process: in the initial upward movement, the rack and pinion drive the clamping plate to release the battery synchronously through reverse transmission. As the upward movement continues, the fixed plate drives the driving block to contact and link with the driving rod, driving the placement plate to move upward and separate the battery from the test platform. Subsequently, the electric magnet and the magnetic plate are attracted and linked again, storing the driving block inside the fixed plate to avoid interference during the reset process and ensure smooth reset of the equipment. The entire unloading and reset process is linked and connected, requiring no additional manual operation, improving unloading efficiency and equipment operation stability. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the inspection method of the present invention; Figure 2 This is a schematic diagram of the hydraulic rod mounting structure of the present invention; Figure 3 This is a schematic diagram of the extrusion plate mounting structure of the present invention; Figure 4 This is a schematic diagram of the mounting structure of the placement plate of the present invention; Figure 5 This is a schematic diagram of the adjusting screw mounting structure of the present invention; Figure 6 This is a schematic diagram of the mounting structure of the fixing plate of the present invention; Figure 7 This is a schematic diagram of the hydraulic rod mounting structure of the present invention; Figure 8 This is the invention Figure 4 Enlarged structural diagram of region A in the middle; Figure 9 This is the invention Figure 6 Enlarged structural diagram of region B in the middle; The diagram is labeled as follows: 1. Detection box; 2. Hydraulic rod; 3. Extrusion plate; 4. Box door; 5. Adjustable clamping assembly; 501. Four-axis commutator; 502. Adjusting screw; 503. Adjusting component; 5031. Threaded cylinder; 5032. Limit block; 5033. Extrusion screw; 5034. Drive ring; 504. Moving plate; 505. Clamping plate; 506. Scale line; 507. Gear rack; 508. Gear; 509. Rubber cylinder; 6. Automatic feeding assembly; 601. Moving column; 602. Connecting plate; 603. Placement plate; 604. Magnetic plate; 605. Drive rod; 606. Fixing plate; 607. Spring telescopic column; 608. Drive block; 609. Electric magnet. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example: Figure 1 As shown, the present invention provides a technical solution: a method for detecting retired batteries. S1: Pre-test inspection: Check the connection and operation of the testing fixture, testing box 1, hydraulic rod 2, extrusion plate 3 and box door 4; S2: Battery loading: Place the battery inside the testing box 1; S3: Battery clamping and detection: Activating hydraulic rod 2 moves extrusion plate 3, and extrusion plate 3 enables the detection fixture to clamp the battery. As extrusion plate 3 continues to move, the battery is detected. S4: Battery Removal: After the test is completed, as the extrusion plate 3 moves upward, the test fixture moves synchronously to separate the battery from the inner end face of the test box 1. After placing the battery for half an hour, open the box door 4 to remove the battery.

[0023] like Figure 2-9 As shown, a testing fixture adapted to retired batteries of various specifications is provided. A hydraulic rod 2 is installed on the top of the testing box 1 by screws, and a pressing plate 3 is installed on the bottom of the hydraulic rod 2 by screws. A door 4 is provided on one side of the testing box 1. The test box 1 is equipped with an adjustable clamping assembly 5, which includes a four-axis commutator 501, an adjusting screw 502, an adjusting component 503, a moving plate 504, a clamping plate 505, a scale line 506, a rack 507, a gear 508, and a rubber cylinder 509. The test box 1 is equipped with a four-axis commutator 501. Adjusting screws 502 are evenly arranged on the outside of the four-axis commutator 501. Adjusting component 503 is arranged on the outside of the adjusting screws 502. A movable plate 504 is arranged at one end of the adjusting component 503. A clamping plate 505 is installed on the top of the movable plate 504 by screws. Scale lines 506 are evenly arranged inside the test box 1. A toothed rod 507 is installed at the bottom of the extrusion plate 3 by screws. A rubber cylinder 509 is rotatably connected to one end of an adjusting screw 502. A gear 508 is glued to the outside of the rubber cylinder 509.

[0024] Adjusting component 503 includes threaded cylinder 5031, limiting block 5032, pressing screw 5033 and driving ring 5034; A threaded cylinder 5031 is threadedly connected to the outside of the adjusting screw 502. A limit block 5032 is rotatably connected to the outside of the threaded cylinder 5031. A pressing screw 5033 is threadedly connected to one end of the limit block 5032. A driving ring 5034 is fixedly connected to one end of the threaded cylinder 5031. The driving ring 5034 is rotatably embedded and installed inside the moving plate 504.

[0025] The detection box 1 has a moving groove at the position of the limiting block 5032. The outer side of the limiting block 5032 is in contact with the inner wall of the moving groove to ensure the stability of the movement of the limiting block 5032, thereby ensuring the stability of the movement of the clamping plate 505, and thus facilitating stable clamping of the battery.

[0026] The end face of the extrusion screw 5033 is in contact with the end face of the threaded cylinder 5031. One end of the threaded cylinder 5031 is fixedly connected to a rotating handle, which makes it easy for personnel to rotate the threaded cylinder 5031. When the threaded cylinder 5031 and the limiting block 5032 are loose, the personnel can rotate the threaded cylinder 5031 to move one clamping plate 505 independently. The extrusion screw 5033 fixes the threaded cylinder 5031 and the limiting block 5032, so as to realize the synchronous movement of multiple clamping plates 505.

[0027] The rack 507 and the gear 508 are positioned corresponding to each other. The rack 507 can mesh with the gear 508 to facilitate the rotation of the gear 508, thereby rotating the adjusting screw 502. Through the connection of the four-axis commutator 501, multiple adjusting screws 502 can be rotated synchronously, thereby moving multiple clamping plates 505.

[0028] The testing box 1 is equipped with an automatic feeding assembly 6, which includes a moving column 601, a connecting plate 602, a placement plate 603, a magnetic plate 604, a driving rod 605, a fixed plate 606, a spring telescopic column 607, a driving block 608, and an electric magnet 609. Inside the testing box 1, there are movable columns 601 that slide evenly. The tops of multiple movable columns 601 are connected by a connecting plate 602, and the bottoms of multiple movable columns 601 are connected by a placement plate 603. Both ends of the placement plate 603 are welded with a driving rod 605. Both ends of the bottom of the extrusion plate 3 are fitted with fixing plates 606 by screws. Inside the bottom of the fixing plate 606, a spring telescopic column 607 is fitted with screws. One end of the spring telescopic column 607 is fitted with a driving block 608 by screws. Magnetic plates 604 are fixedly connected inside the driving block 608, inside the placement plate 603, and inside the detection box 1. An electric magnet 609 is fixedly connected to one end of the bottom of the fixing plate 606.

[0029] The positions of the magnetic plates 604 inside the drive block 608 and inside the detection box 1 correspond to each other, and the positions of the magnetic plates 604 inside the placement plate 603 and the electric magnet 609 correspond to each other, which facilitates the mutual attraction between the magnetic plates 604 inside the drive block 608 and inside the detection box 1, thereby facilitating the fixation of the drive block 608 and the placement plate 603, and also facilitates the attraction of the drive block 608 into the fixed plate 606, which facilitates the movement of the pressing plate 3.

[0030] The bottom of the drive block 608 is provided with an inclined angle, and the top surface of the drive block 608 can contact the bottom surface of the drive rod 605. When the extrusion plate 3 moves upward, it is convenient to drive the drive rod 605 to move upward, thereby driving the placement plate 603 to move, so that the battery is separated from the placement platform inside the test box 1, making it convenient for personnel to take the battery.

[0031] Open the box door 4, place the retired battery to be tested on top of the placement plate 603 of the automatic feeding assembly 6, close the box door 4, start the electric magnet 609, the electric magnet 609 attracts the magnetic plate 604 inside the placement plate 603, and drives the placement plate 603 to slide along the inside of the testing box 1 to the testing station via the moving column 601. At this time, the magnetic plate 604 inside the driving block 608 attracts the magnetic plate 604 inside the testing box 1, fixing the driving block 608 and the placement plate 603, thus achieving the initial positioning of the battery.

[0032] According to the size of the battery and referring to the scale line 506 inside the test box 1, the personnel first loosen the extrusion screw 5033 of the corresponding adjustment part 503, rotate the rotating handle of the threaded cylinder 5031 to adjust it separately, drive the clamping plate 505 to move, move the clamping plate 505 to the appropriate position, and tighten the extrusion screw 5033 after the adjustment is completed. The hydraulic rod 2 extends, causing the extrusion plate 3 to move downwards. The toothed rod 507 at the bottom of the extrusion plate 3 moves downwards and meshes with the gear 508. As the extrusion plate 3 continues to move downwards, the toothed rod 507 drives the gear 508 to rotate. The gear 508, through the rubber cylinder 509, drives the corresponding adjusting screw 502 to rotate. Through the transmission action of the four-axis commutator 501, this adjusting screw 502 synchronously drives the other adjusting screws 502 to rotate. The adjusting screw 502, through its threaded engagement, drives the outer threaded cylinder 5031 to move. 1. The moving plate 504 and the clamping plate 505 are moved synchronously towards the battery by the driving ring 5034 until the clamping plate 505 is in close contact with the side of the battery, thus completing the stable clamping of the battery. As the pressing plate 3 moves downward, the rack 507 drives the gear 508 to rotate. However, the clamping plate 505 is limited by the battery. At this time, the friction between the rubber cylinder 509 and the adjusting screw 502 is less than the rotational force of the gear 508. Therefore, the rotation of the gear 508 will not drive the adjusting screw 502 to rotate, which facilitates the subsequent battery inspection and processing. As the extrusion plate 3 moves downward, it extrudes the battery, performing extrusion detection. After detection, the hydraulic rod 2 retracts, causing the extrusion plate 3 to move upward. The rack 507 drives the gear 508 to rotate in the opposite direction, which in turn drives the adjusting screw 502 to rotate in the opposite direction. This causes the clamping plate 505 to move away from the battery, releasing the clamp. The electric magnet 609 is then deactivated, releasing the adsorption and fixation on the placement plate 603. The spring telescopic column 607 stretches, pushing the drive block 608 to move. At this time, the extrusion plate 3 continues to move upward, and the fixing plate 606 moves upward simultaneously, causing the bottom end face of the drive block 608 to align with the bottom surface of the drive rod 605. Contact and drive the rod 605 to move upward. The rod 605 drives the placement plate 603 to move upward through the moving column 601, so that the battery is separated from the placement platform inside the test box 1. At this time, the two adjacent magnetic plates 604 attract each other and fix the connecting plate 602. Then, the electric magnet 609 is turned on again to attract the magnetic plate 604 at the end of the driving block 608, and move the driving block 608 into the fixed plate 606. This will not hinder the movement of the squeezing plate 3. After all the structures are reset, the battery is placed in the test box 1 for half an hour. If the battery does not explode or leak, personnel can take the battery out by opening the box door.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for detecting retired batteries, characterized in that, include: S1: Pre-test inspection: Check the connection and operation of the testing fixture, testing box (1), hydraulic rod (2), extrusion plate (3) and box door (4); S2: Battery loading: Place the battery inside the testing box (1); S3: Battery clamping and detection: The hydraulic rod (2) is activated to move the extrusion plate (3). The extrusion plate (3) is used to clamp the battery by running the detection fixture. The battery is detected as the extrusion plate (3) continues to move. S4: Battery Retrieval: After the test is completed, as the extrusion plate (3) moves upward, the test fixture moves synchronously to separate the battery from the inner end face of the test box (1). After placing the battery for half an hour, open the box door (4) to retrieve the battery.

2. A testing fixture adaptable to retired batteries of various specifications, characterized in that: The inside of the testing box (1) is provided with four clamping plates (505) that can move synchronously. The clamping plates (505) are individually adjustable by adjusting members (503). The clamping plates (505) are driven to move by the movement of the extrusion plate (3). The clamping plates (505) and the extrusion plate (3) are connected by a rack (507) and a gear (508). The inside of the testing box (1) is provided with a placement plate (603) that moves as the extrusion plate (3) moves upward. The placement plate (603) and the extrusion plate (3) are driven by a driving member. The driving member includes a driving rod (605), a fixed plate (606), a spring telescopic column (607), and a driving block (608).

3. The testing fixture for adapting to retired batteries of multiple specifications according to claim 2, characterized in that, The testing box (1) is equipped with an adjustable clamping assembly (5), which includes a four-axis commutator (501), an adjusting screw (502), an adjusting component (503), a moving plate (504), a clamping plate (505), a scale line (506), a rack (507), a gear (508), and a rubber sleeve (509). The testing box (1) is equipped with the four-axis commutator (501), and the adjusting screw (502) is evenly arranged on the outer side of the four-axis commutator (501). The adjustment member (503) is provided on the outside of (502), and the moving plate (504) is provided at one end of the adjustment member (503). The clamping plate (505) is installed on the top of the moving plate (504) by screws. The scale lines (506) are evenly arranged inside the detection box (1). The toothed rod (507) is installed on the bottom of the extrusion plate (3) by screws. The rubber cylinder (509) is inserted and rotatably connected to one end of the adjustment screw (502). The gear (508) is bonded to the outside of the rubber cylinder (509).

4. The testing fixture for adapting to multiple specifications of retired batteries according to claim 3, characterized in that, The adjusting component (503) includes a threaded cylinder (5031), a limiting block (5032), a pressing screw (5033), and a driving ring (5034). The outer side of the adjusting screw (502) is threadedly connected to the threaded cylinder (5031), and the outer side of the threaded cylinder (5031) is rotatably connected to the limiting block (5032). One end of the inner side of the limiting block (5032) is threadedly connected to the pressing screw (5033), and one end of the threaded cylinder (5031) is fixedly connected to the driving ring (5034). The driving ring (5034) is rotatably embedded and installed inside the moving plate (504).

5. A testing fixture for adapting to retired batteries of multiple specifications according to claim 4, characterized in that, A movable groove is provided at the position of the limiting block (5032) corresponding to the detection box (1), and the outer side of the limiting block (5032) is in contact with the inner wall of the movable groove.

6. A testing fixture for adapting to retired batteries of multiple specifications according to claim 4, characterized in that, The end face of the extrusion screw (5033) is in contact with the end face of the threaded cylinder (5031), and a rotating handle is fixedly connected to one end of the threaded cylinder (5031).

7. A testing fixture for adapting to retired batteries of multiple specifications according to claim 3, characterized in that, The rack (507) and the gear (508) are positioned corresponding to each other, and the rack (507) and the gear (508) are meshed together.

8. A testing fixture for adapting to retired batteries of multiple specifications according to claim 2, characterized in that, The detection box (1) is equipped with an automatic feeding assembly (6), which includes a moving column (601), a connecting plate (602), a placement plate (603), a magnetic plate (604), a driving rod (605), a fixed plate (606), a spring telescopic column (607), a driving block (608), and an electric magnet (609). The moving columns (601) are uniformly slidably connected inside the detection box (1). The tops of multiple moving columns (601) are connected through the connecting plate (602), and the bottoms of multiple moving columns (601) are connected through the placement plate (603). Both ends of the placement plate (603) are welded with driving rods (605); both ends of the bottom of the extrusion plate (3) are fitted with fixing plates (606) by screws. The bottom end of the fixing plate (606) is fitted with spring telescopic columns (607) by screws. One end of the spring telescopic columns (607) is fitted with a driving block (608) by screws. The magnetic plate (604) is fixedly connected inside the driving block (608), inside the placement plate (603), and inside the detection box (1). The bottom end of the fixing plate (606) is fixedly connected with an electric magnet (609).

9. A testing fixture for adapting to retired batteries of multiple specifications according to claim 8, characterized in that, The positions of the magnetic plate (604) inside the drive block (608) and the magnetic plate (604) inside the detection box (1) correspond to each other, and the positions of the magnetic plate (604) inside the placement plate (603) and the electric magnet (609) correspond to each other.

10. A testing fixture for adapting to retired batteries of multiple specifications according to claim 8, characterized in that, The bottom of the drive block (608) is provided with an inclined angle, and the top surface of the drive block (608) is in contact with the bottom surface of the drive rod (605).

Images