A lithium battery deep discharge safety testing device

Abstract

This invention relates to the field of lithium battery discharge testing technology, and more particularly to a deep discharge safety testing device for lithium batteries. The device includes a testing frame and lithium battery blocks. A discharge detector is fixedly connected to the testing frame. Six lithium battery blocks are arranged. The testing frame is equipped with a positioning mechanism to restrict the position of the lithium battery blocks. A fixed frame is located above the testing frame, and support frames are fixedly connected to both sides of the fixed frame and the top of the testing frame. Through the arrangement of the positioning mechanism and the series connection mechanism, the present invention allows the testing personnel to simply place the lithium battery blocks on the testing frame in series order, then press down on the shaped plate to press the upper and lower connecting plates to the positive or negative side of the lithium battery blocks. Then, the shaped plate is pushed to push the upper and lower connecting plates into the series connection position of the lithium battery blocks. At this time, the series connection mechanism restricts the position of the shaped plate, thereby achieving rapid series connection of multiple lithium battery blocks without the need for tools to connect them one by one, greatly improving the testing efficiency of the device.

Description

Technical Field

[0001] This invention relates to the field of lithium battery discharge detection technology, and in particular to a lithium battery deep discharge safety detection device. Background Technology

[0002] With the rapid development of new energy technologies, lithium batteries, as a high-efficiency and environmentally friendly energy storage device, have been widely used in electric vehicles, mobile devices, energy storage systems, and other fields. However, lithium batteries will gradually age and degrade in performance during use, eventually becoming waste lithium batteries. Waste lithium batteries contain a large number of valuable metal resources, such as lithium, cobalt, and nickel. Recycling and reusing them can not only reduce resource waste but also reduce environmental pollution. Therefore, effective discharge safety testing of waste lithium batteries is an important step in realizing their recycling.

[0003] In many practical applications, such as electric vehicles or large energy storage systems, batteries are usually used in series. Therefore, existing lithium battery discharge testing uses multiple lithium batteries to conduct a series discharge test, which can more accurately simulate the performance of the battery under actual use conditions.

[0004] However, traditional lithium battery discharge testing methods usually require testers to place multiple sets of lithium batteries on a test rack and then connect all the lithium batteries in series. During the series connection process, wires need to be installed in designated positions, and then tools are used to tighten the wire clamping bolts on the lithium batteries. This is not only time-consuming and labor-intensive, but also reduces testing efficiency. In addition, manual operation may cause physical damage to the lithium batteries during the series connection process, increasing safety risks.

[0005] Therefore, a lithium battery deep discharge safety testing device is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a lithium battery deep discharge safety testing device.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a lithium battery deep discharge safety testing device, comprising a testing frame and lithium battery blocks, a discharge detector fixedly connected to the testing frame, six lithium battery blocks being provided, a positioning mechanism for limiting the position of the lithium battery blocks being provided on the testing frame, a fixed frame being provided above the testing frame, support frames being fixedly connected between the two sides of the fixed frame and the top of the testing frame, three U-shaped upper connecting plates and a pair of U-shaped lower connecting plates being respectively provided above the lithium battery blocks, an insulating layer being provided on the outer wall of the upper and lower connecting plates, a connecting frame being fixedly connected between the top ends of the insulating layer, a sliding frame being slidably connected longitudinally inside the fixed frame, a moving block being slidably connected laterally inside the sliding frame, and the bottom end of the moving block being fixedly connected to the top of the connecting frame, and a series mechanism for driving the upper and lower connecting plates to connect with the positive and negative terminals of the lithium battery blocks being provided inside the fixed frame.

[0008] In the above technical solution, further, several baffles are fixedly connected at equal intervals at the top of the testing frame, and the six lithium battery blocks are placed between the baffles on the testing frame.

[0009] In the above technical solution, the series mechanism further includes a mountain-shaped plate, a circular hole through which the side wall of the movable block is opened, and a round rod is slidably connected to both ends of the inner side of the circular hole. A series spring is fixedly connected between the round rods. Straight grooves are opened on both sides of the outer wall of the sliding frame, and vertical grooves are opened on both sides of the inner side of the fixed frame. The side ends of the round rods pass through the straight grooves and are inserted into the vertical grooves. A horizontal groove is opened at the bottom of the side wall of the vertical groove. An inclined groove is opened between the end of the horizontal groove and the top of the vertical groove. Three sliding grooves are opened on the front side of the fixed frame. The mountain-shaped plate is inserted into the three sliding grooves, and the side wall of the mountain-shaped plate is fixedly connected to the side wall of the movable block. A groove is opened at the bottom of the inclined groove. A cavity is opened inside the fixed frame relative to the side of the inclined groove. A limit block is slidably connected to the inner side of the cavity, and the side end of the limit block is set through the inner side of the inclined groove.

[0010] In the above technical solution, the horizontal groove is deeper than the vertical groove, and the top of the groove is inclined at the connection with the inner side of the inclined groove. The ends of the round rods that are furthest from each other are all set as smooth arc surfaces.

[0011] In the above technical solution, the bottom end of the limiting block is flush with the top end of the transverse groove, the bottom end of the cavity is fixedly connected to an upper electric telescopic cylinder, the output end of the upper electric telescopic cylinder is fixedly connected to a release plate, and the limiting block is fixedly connected to the side wall of the release plate.

[0012] In the above technical solution, furthermore, a plurality of upper springs are fixedly connected between the top end of the fixed frame and the top end of the sliding frame, and a plurality of lower springs are fixedly connected between the inner side of the sliding frame and the side wall of the moving block.

[0013] In the above technical solution, the positioning mechanism further includes a positioning rod, and push slots adapted to the positioning rod are provided at both ends of the inner side of the detection frame. Positioning frames are fixedly connected to the front side of the detection frame relative to the push slots. Bolts are threadedly connected to the opposite side of the positioning frames. The positioning rod is inserted into the inner side of the positioning frame. A conveyor line for conveying lithium battery blocks is provided on the rear side of the detection frame. A bottom groove is provided on the rear side of the detection frame. A limiting plate is slidably connected to the inner side of the bottom groove. Lower electric telescopic cylinders are fixedly connected to both sides of the bottom groove. The output end of the lower electric telescopic cylinder is fixedly connected to the top of the limiting plate.

[0014] In the above technical solution, a T-shaped block is further slidably connected to the inner side of the positioning frame, slots are provided on both sides of the positioning rod, and the slots are inclined on the side closer to the detection frame. The T-shaped block is inclined on the side closer to the detection frame, and the bolt side end is rotatably connected to the side wall of the T-shaped block.

[0015] In the above technical solution, further, the bottom end of the detection frame is fixedly connected with several U-shaped brackets for placing positioning rods, and the front side of the positioning rod is fixedly connected with a pair of handles.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention, through the setting of positioning mechanism and series connection mechanism, allows the testing personnel to simply place the lithium battery blocks on the testing rack in series order, then press down the mountain-shaped plate to press the upper and lower connecting plates down to the positive or negative side of the lithium battery blocks, and then push the mountain-shaped plate to push the upper and lower connecting plates into the series connection position of the lithium battery blocks. At this time, the series connection mechanism will restrict the position of the mountain-shaped plate, thereby realizing the rapid series connection of multiple lithium battery blocks without the need to connect them one by one with tools, which greatly improves the testing efficiency of the device.

[0018] 2. This invention, through the design of a positioning rod and an upper electric telescopic cylinder, can automatically release the restriction of the mountain-shaped plate after the discharge detection is completed, and drive the upper and lower connecting plates to move away from the positive or negative electrode of the lithium battery block. Then, the positioning rod is released from its limit, and the lower electric telescopic cylinder is controlled to retract, releasing the limit of the lithium battery block. This allows the positioning rod to slide in the push groove, thereby quickly pushing multiple lithium battery blocks onto the conveyor line, achieving rapid unloading of lithium battery blocks, and further improving the detection efficiency of the device. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the front of the detection device of the present invention;

[0020] Figure 2 Appendix of the present invention Figure 1 A magnified view of the structure at point A in the middle;

[0021] Figure 3 This is a rear-view three-dimensional structural diagram of the detection device of the present invention;

[0022] Figure 4 This is a top-view, partially cross-sectional, three-dimensional structural diagram of the detection frame of the present invention;

[0023] Figure 5 This is a rear-view three-dimensional structural diagram of the detection frame of the present invention;

[0024] Figure 6 This is a schematic diagram of a partial three-dimensional structure of the positioning rod and T-block separated according to the present invention;

[0025] Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the fixed frame of the present invention;

[0026] Figure 8 This is a top-view three-dimensional structural diagram of the sliding frame and moving block of the present invention;

[0027] Figure 9 This is a schematic diagram of the three-dimensional structure of the fixed frame side of the present invention;

[0028] Figure 10 This is a bottom-view perspective view of the fixed frame and support frame of the present invention.

[0029] In the diagram: 1. Detection frame; 2. Lithium battery block; 3. Discharge detector; 4. Baffle; 5. Fixing frame; 6. Support frame; 7. Upper connecting plate; 8. Lower connecting plate; 9. Insulation layer; 10. Connecting frame; 11. Sliding frame; 12. Moving block; 13. Mountain-shaped plate; 14. Round rod; 15. Series spring; 16. Straight groove; 17. Vertical groove; 18. Horizontal groove; 19. Inclined groove; 20. Groove; 21. Limiting block; 22. Upper electric telescopic cylinder; 23. Release plate; 24. Upper spring; 25. Lower spring; 26. Positioning rod; 27. Push groove; 28. Positioning frame; 29. ​​Bolt; 30. Conveyor line; 31. Limiting plate; 32. Lower electric telescopic cylinder; 33. Slot; 34. U-shaped bracket; 35. Handle; 36. T-shaped block. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0032] In practical use, it was found that traditional lithium battery discharge testing methods usually require the tester to place multiple sets of lithium batteries on the test rack 1 and then connect all the lithium batteries in series. During the series connection process, the wires need to be installed in designated positions, and then the wire clamping bolts on the lithium batteries need to be tightened with tools. This is not only time-consuming and labor-intensive, but also reduces the testing efficiency. In addition, manual operation may cause physical damage to the lithium batteries during the series connection process, increasing safety risks. To solve the above problems, the following structure was invented.

[0033] like Figures 1-10 The lithium battery deep discharge safety testing device shown includes a testing frame 1 and lithium battery blocks 2. A discharge detector 3 is fixedly connected to the testing frame 1. The lithium battery discharge detector 3 discharges the battery by simulating a load and measures parameters such as voltage, current, and temperature during the discharge process to evaluate the battery's capacity, internal resistance, and health status. Six lithium battery blocks 2 are provided. The testing frame 1 is equipped with a positioning mechanism to limit the position of the lithium battery blocks 2. A fixing frame 5 is provided above the testing frame 1. Support frames 6 are fixedly connected to both sides of the fixing frame 5 and the top of the testing frame 1. Three U-shaped upper connecting plates 7 and a pair of U-shaped lower connecting plates 8 are respectively provided above the lithium battery blocks 2. (It should be noted that in order to more stably ensure the normal series connection between the lithium battery blocks 2, the upper connecting plates 7 and the lower connecting plates 8 are...) The ends of the connecting plates 8 are provided with semi-circular grooves to ensure that the upper connecting plate 7 and the lower connecting plate 8 have more contact with the positive and negative electrode pressure bolts of the lithium battery block 2. The outer walls of the upper connecting plate 7 and the lower connecting plate 8 are provided with insulating layers 9. A connecting frame 10 is fixedly connected between the top ends of the insulating layers 9. The connecting frame 10 is isolated from the upper connecting plate 7 and the lower connecting plate 8 through the insulating layers 9 to ensure normal series connection between the lithium battery blocks 2. The upper connecting plate 7 and the lower connecting plate 8 are both made of conductive copper. A sliding frame 11 is slidably connected longitudinally inside the fixed frame 5. A moving block 12 is slidably connected laterally inside the sliding frame 11. The bottom end of the moving block 12 is fixedly connected to the top end of the connecting frame 10. The fixed frame 5 is provided with a series connection mechanism for driving the upper connecting plate 7 and the lower connecting plate 8 to connect with the positive and negative electrodes of the lithium battery block 2.

[0034] Several baffles 4 are fixedly connected at equal intervals at the top of the testing frame 1. The six lithium battery blocks 2 are placed between the baffles 4 on the testing frame 1. The baffles 4 can limit the lithium battery blocks 2 when they are placed on the testing frame 1, ensuring that the lithium battery blocks 2 are properly positioned, thereby ensuring the normal operation of the subsequent series connection mechanism. (It should be noted that when the six lithium battery blocks 2 are placed on the testing frame 1, the positive and negative electrodes of two adjacent lithium battery blocks 2 need to be staggered to ensure the normal series connection of the subsequent lithium battery pack. In addition, the lithium battery blocks 2 that need to be connected to the positive electrode of the discharge detector 3 need to be placed on the side closer to the discharge detector 3 to ensure the normal operation of the subsequent series connection.)

[0035] The series mechanism includes a mountain-shaped plate 13, a circular hole through the side wall of the movable block 12, and a circular rod 14 slidably connected to both ends of the circular hole. A series spring 15 is fixedly connected between the circular rods 14. Straight grooves 16 are opened on both sides of the outer wall of the sliding frame 11. Vertical grooves 17 are opened on both sides of the inner wall of the fixed frame 5. The side ends of the circular rods 14 pass through the straight grooves 16 and are inserted into the vertical grooves 17. Horizontal grooves 18 are opened at the bottom of the side wall of the vertical grooves 17. An inclined groove 19 is opened between the end of the horizontal groove 18 and the top of the vertical groove 17. Three sliding grooves are opened on the front side of the fixed frame 5. The mountain-shaped plate 13 is inserted into the three sliding grooves. The side wall of the mountain-shaped plate 13 is fixedly connected to the side wall of the movable block 12. A groove 20 is opened at the bottom of the inclined groove 19. A cavity is opened inside the fixed frame 5 relative to the side of the inclined groove 19. A limit block 21 is slidably connected inside the cavity. The side end of the limit block 21 passes through the inner side of the inclined groove 19.

[0036] The horizontal groove 18 is deeper than the vertical groove 17, and the top of the groove 20 is inclined at the connection with the inner side of the inclined groove 19. The ends of the round rod 14 that are far apart are all set as smooth arc surfaces.

[0037] Several upper springs 24 are fixedly connected between the top of the fixed frame 5 and the top of the sliding frame 11, and several lower springs 25 are fixedly connected between the inner side of the sliding frame 11 and the side wall of the moving block 12. The setting of the upper springs 24 and the lower springs 25 makes it easy to directly pull the sliding frame 11 and the moving block 12 to reset after the round rod 14 is released from its limit.

[0038] The positioning mechanism includes a positioning rod 26. Push slots 27 adapted to the positioning rod 26 are provided at both ends of the inner side of the test frame 1. Positioning frames 28 are fixedly connected to the front side of the test frame 1 relative to the push slots 27. Bolts 29 are threadedly connected to the side of the positioning frames 28 away from each other. The positioning rod 26 is inserted into the inner side of the positioning frame 28. The lithium battery block 2 can be locked on the test frame 1 by the positioning rod 26 to ensure stability during series connection and discharge test. It avoids problems between the lithium battery blocks 2 due to displacement, which would affect the test results of discharge test. A bottom groove is provided on the rear side of the test frame 1. A limiting plate 31 is longitudinally slidably connected to the inner side of the bottom groove. The limiting plate 31 restricts the rear position of the lithium battery block 2 on the test frame 1.

[0039] A T-shaped block 36 is slidably connected to the inner side of the positioning frame 28. Slots 33 are provided on both sides of the positioning rod 26, and the slots 33 are inclined on the side closer to the detection frame 1. The T-shaped block 36 is inclined on the side closer to the detection frame 1. The side end of the bolt 29 is rotatably connected to the side wall of the T-shaped block 36.

[0040] When performing deep discharge testing on waste lithium batteries, first, the lithium battery blocks 2 are installed in series on the testing frame 1 (at this time, the limiting plate 31 is in the raised state, which will restrict the position of the lithium battery blocks 2). Then, the positioning rod 26 can be taken out and inserted into the positioning frame 28. Then, the bolts 29 on both sides are rotated and slid inward, pushing the T-shaped block 36 to slide laterally in the positioning frame 28. Then, the end of the T-shaped block 36 is inserted into the slot 33 (during this process, the inclined surface of the T-shaped block 36 will press against the inclined surface of the slot 33, thereby pushing the positioning rod 26 to slide backward and pressing the positioning rod 26 tightly). On the lithium battery block 2, the position of the lithium battery block 2 is restricted. Then, it can be pushed down into the three sliding grooves of the mountain-shaped plate 13 to slide. At the same time, it drives the moving block 12 and the sliding frame 11 to move down and stretch the upper spring 24 (since the moving block 12 can only slide horizontally in the sliding frame 11, the sliding frame 11 slides vertically in the fixed frame 5 at this time). At the same time, it will drive the round rods 14 on both sides of the moving block 12 to slide in the vertical groove 17, and drive the upper connecting plate 7 and the lower connecting plate 8 to move down through the connecting frame 10, so that the upper connecting plate 7 and the lower connecting plate 8 move to the side of the series position of the lithium battery block 2.

[0041] At this point, the round rod 14 will slide out of the vertical groove 17 and into the horizontal groove 18. Since the depth of the horizontal groove 18 is greater than the depth of the vertical groove 17, the side end of the round rod 14 will be pushed into the horizontal groove 18 by the elastic force of the series spring 15 (because the horizontal groove 18 and the vertical groove 17 have steps, the upward sliding of the round rod 14 will be restricted, thus restricting the upward sliding of the upper connecting plate 7 and the lower connecting plate 8). Then, the mountain-shaped plate 13 can be pushed backward, thereby causing the moving block 12 to slide laterally in the sliding frame 11. This will cause the upper connecting plate 7 and the lower connecting plate 8 to move backward through the connecting frame 10, so that the semi-circular grooves on the upper connecting plate 7 and the lower connecting plate 8 are inserted into the lithium battery. On the outer wall of the positive and negative electrode pressure bolts of pool block 2, during this process, the lower spring 25 will be stretched, and the round rod 14 will slide in the transverse groove 18. When the upper connecting plate 7 and the lower connecting plate 8 contact the pressure bolts, the round rod 14 will move to the groove 20 at the bottom of the inclined groove 19, and then under the elastic force of the series spring 15, push the side end of the round rod 14 into the groove 20 (since there is a step between the groove 20 and the transverse groove 18, the reverse movement of the round rod 14 will be restricted, and the limiting block 21 in the inclined groove 19 will be in the extended state, thereby restricting the upward sliding of the round rod 14, thus ensuring the position of the upper connecting plate 7 and the lower connecting plate 8).

[0042] Then, the mountain-shaped plate 13 can be released to complete the rapid series connection of multiple lithium battery blocks 2. Finally, the positive and negative terminal connection lines on the discharge detector 3 are connected to the positive and negative terminals of the series-connected lithium battery pack to perform the discharge test.

[0043] In summary, with the above structural design, the testing personnel only need to place the lithium battery blocks 2 on the testing rack 1 in series order, then press down on the mountain-shaped plate 13 to press the upper connecting plate 7 and the lower connecting plate 8 to the positive or negative side of the lithium battery blocks 2. Then, push the mountain-shaped plate 13 to push the upper connecting plate 7 and the lower connecting plate 8 into the series connection position of the lithium battery blocks 2. At this time, the series connection mechanism will restrict the position of the mountain-shaped plate 13, thereby realizing the rapid series connection of multiple lithium battery blocks 2 without the need to connect them one by one with tools, which greatly improves the testing efficiency of the device.

[0044] Based on the above embodiments, it was found during use that although the above structure can quickly connect the lithium battery blocks 2 in series, after the discharge detection is completed, it is still necessary to disconnect the series connection between multiple lithium battery blocks 2 and remove the lithium battery blocks 2, which is quite troublesome. In order to solve the above problems, the above structure has been further improved.

[0045] The rear side of the testing frame 1 is provided with a conveyor line 30 for conveying lithium battery blocks 2. Both sides of the bottom groove are fixedly connected with lower electric telescopic cylinders 32, and the output end of the lower electric telescopic cylinders 32 is fixedly connected to the top of the limiting plate 31.

[0046] The bottom end of the limiting block 21 is flush with the top end of the transverse groove 18. The bottom end of the cavity is fixedly connected to the upper electric telescopic cylinder 22. The output end of the upper electric telescopic cylinder 22 is fixedly connected to the release plate 23, and the limiting block 21 is fixedly connected to the side wall of the release plate 23.

[0047] The bottom of the testing frame 1 is fixedly connected with several U-shaped brackets 34 for placing the positioning rods 26. The U-shaped brackets 34 facilitate the storage of the positioning rods 26 during the placement of the lithium battery block 2. A pair of handles 35 are fixedly connected to the front of the positioning rods 26. The handles 35 facilitate the pushing and pulling of the positioning rods 26 by the testing personnel, improving the convenience of the device.

[0048] After the discharge detection is completed, first remove the positive and negative connection wires from the discharge detector 3, then control the upper electric telescopic cylinder 22 to start and drive the release plate 23 to retract, while simultaneously driving the limit block 21 to move out of the inclined groove 19, thereby releasing the upward sliding restriction of the round rod 14. Then, under the elastic force of the upper spring 24 and the lower spring 25, the round rod 14 is pulled to slide obliquely upward in the inclined groove 19, while simultaneously driving the upper connecting plate 7 and the lower connecting plate 8 to move obliquely upward (it should be noted here that since the upper connecting plate 7 and the lower connecting plate 8 are moving obliquely upward...). The upper connecting plate 7 and the lower connecting plate 8 will move directly from the wire clamping bolt of the lithium battery block 2 without being obstructed by the nut on the wire clamping bolt. During this process, the round rod 14 will slide out from the inclined surface at the connection between the groove 20 and the inclined groove 19. During this process, the inclined surface will squeeze the round rod 14, causing the round rod 14 to slide into the round hole and compress the series spring 15. Then the round rod 14 will slide out from the inclined groove 19 and slide into the vertical groove 17, releasing the automatic removal of the upper connecting plate 7 and the lower connecting plate 8 from the wire clamping bolt of the lithium battery block 2.

[0049] Then, the electric telescopic cylinder 32 is started and the limiting plate 31 slides downward in the bottom groove, thereby releasing the restriction on the rear position of the lithium battery block 2. Then, the T-shaped block 36 is pulled out from the slot 33 by rotating the bolt 29 in the opposite direction, releasing the restriction on the positioning rod 26. Finally, the inspector pushes the handle 35 to drive the positioning rod 26 to slide in the push groove 27, thereby driving multiple lithium battery blocks 2 to slide backward on the inspection frame 1 until multiple lithium battery blocks 2 are pushed onto the conveyor line 30, thus completing the rapid unloading of the lithium battery blocks 2.

[0050] In summary, through the design of the above structure, after the discharge detection is completed, the restriction of the mountain-shaped plate 13 can be automatically released, and the upper connecting plate 7 and the lower connecting plate 8 can be moved away from the positive or negative electrode of the lithium battery block 2. Then, the positioning rod 26 is released from its limit, and the lower electric telescopic cylinder 32 is controlled to retract, releasing the limit of the lithium battery block 2. The positioning rod 26 can then be pushed to slide in the push groove 27, thereby quickly pushing multiple lithium battery blocks 2 onto the conveyor line 30, realizing rapid unloading of the lithium battery blocks 2, and further improving the detection efficiency of the device.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0052] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A lithium battery deep discharge safety testing device, comprising a testing frame (1) and a lithium battery block (2), characterized in that: A discharge detector (3) is fixedly connected to the testing frame (1). Six lithium battery blocks (2) are provided. The testing frame (1) is provided with a positioning mechanism for limiting the position of the lithium battery blocks (2). A fixed frame (5) is provided above the testing frame (1). Support frames (6) are fixedly connected between the two sides of the fixed frame (5) and the top of the testing frame (1). Three U-shaped upper connecting plates (7) and a pair of U-shaped lower connecting plates (8) are respectively provided above the lithium battery blocks (2). The upper connecting plates (7) An insulating layer (9) is provided on the outer wall of the upper connecting plate (7) and the lower connecting plate (8). A connecting frame (10) is fixedly connected between the top ends of the insulating layer (9). A sliding frame (11) is slidably connected to the inner side of the fixed frame (5). A moving block (12) is slidably connected to the inner side of the sliding frame (11). The bottom end of the moving block (12) is fixedly connected to the top end of the connecting frame (10). A series mechanism for driving the upper connecting plate (7) and the lower connecting plate (8) to connect with the positive and negative terminals of the lithium battery block (2) is provided in the fixed frame (5). The series mechanism includes a mountain-shaped plate (13), a circular hole is provided through the side wall of the movable block (12), and a round rod (14) is slidably connected to both ends of the inner side of the circular hole. A series spring (15) is fixedly connected between the round rods (14). Straight grooves (16) are provided on both sides of the outer wall of the sliding frame (11), and vertical grooves (17) are provided on both sides of the inner side of the fixed frame (5). The side ends of the round rods (14) pass through the straight grooves (16) and are inserted into the vertical grooves (17). A horizontal groove (18) is provided at the bottom of the side wall of the vertical groove (17). (18) An inclined groove (19) is provided between the end and the top of the vertical groove (17). Three sliding grooves are provided on the front side of the fixed frame (5). The mountain-shaped plate (13) is inserted into the three sliding grooves. The side wall of the mountain-shaped plate (13) is fixedly connected to the side wall of the moving block (12). A groove (20) is provided at the bottom of the inclined groove (19). A cavity is provided inside the fixed frame (5) relative to the side of the inclined groove (19). A limit block (21) is slidably connected inside the cavity. The side end of the limit block (21) passes through the inside of the inclined groove (19).

2. The lithium battery deep discharge safety testing device according to claim 1, characterized in that: The top of the testing frame (1) is fixedly connected with several baffles (4) at equal intervals, and the six lithium battery blocks (2) are placed between the baffles (4) on the testing frame (1).

3. The lithium battery deep discharge safety testing device according to claim 1, characterized in that: The opening depth of the horizontal groove (18) is deeper than the opening depth of the vertical groove (17), and the top of the groove (20) is inclined at the connection with the inner side of the inclined groove (19). The ends of the round rod (14) that are far apart are all set as smooth arc surfaces.

4. The lithium battery deep discharge safety testing device according to claim 1, characterized in that: The bottom end of the limiting block (21) is flush with the top end of the transverse groove (18). The bottom end of the cavity is fixedly connected to an upper electric telescopic cylinder (22). The output end of the upper electric telescopic cylinder (22) is fixedly connected to a release plate (23). The limiting block (21) is fixedly connected to the side wall of the release plate (23).

5. The lithium battery deep discharge safety testing device according to claim 1, characterized in that: Several upper springs (24) are fixedly connected between the top of the fixed frame (5) and the top of the sliding frame (11), and several lower springs (25) are fixedly connected between the inner side of the sliding frame (11) and the side wall of the moving block (12).

6. The lithium battery deep discharge safety testing device according to claim 1, characterized in that: The positioning mechanism includes a positioning rod (26). Both ends of the inner side of the detection frame (1) are provided with push grooves (27) that are adapted to the positioning rod (26). The front side of the detection frame (1) is fixedly connected to a positioning frame (28) at a position relative to the push groove (27). The side of the positioning frame (28) away from the positioning frame is threaded with a bolt (29). The positioning rod (26) is inserted into the inner side of the positioning frame (28). The rear side of the detection frame (1) is provided with a conveyor line (30) for conveying lithium battery blocks (2). The rear side of the detection frame (1) is provided with a bottom groove. The inner side of the bottom groove is longitudinally slidably connected with a limiting plate (31). Both sides of the bottom groove are fixedly connected with a lower electric telescopic cylinder (32). The output end of the lower electric telescopic cylinder (32) is fixedly connected to the top of the limiting plate (31).

7. The lithium battery deep discharge safety testing device according to claim 6, characterized in that: The positioning frame (28) is laterally slidably connected to a T-shaped block (36). The positioning rod (26) has slots (33) on both sides. The slots (33) are inclined on the side closer to the detection frame (1). The T-shaped block (36) is inclined on the side closer to the detection frame (1). The bolt (29) is rotatably connected to the side wall of the T-shaped block (36).

8. The lithium battery deep discharge safety testing device according to claim 6, characterized in that: The bottom of the testing frame (1) is fixedly connected to several U-shaped brackets (34) for placing positioning rods (26), and a pair of handles (35) are fixedly connected to the front side of the positioning rods (26).

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