Battery internal short circuit test device

Abstract

This utility model discloses a battery internal short-circuit testing device, belonging to the technical field of testing equipment. It includes an outer shell, with a shelf fixedly connected inside. A lower cabinet door is hinged to the bottom of the shelf, and an outer cabinet door is hinged to the front of the outer shell. A fixing buckle is rotatably connected to the surface of the outer cabinet door, and an observation window is fixedly connected to the middle of the outer cabinet door. A sand storage box is fixedly connected to the top of the outer shell. This utility model works by pressing a push rod, which drives a telescopic rod to move. As the push rod moves, the angle between the telescopic rod and the protective shell continuously decreases. Since the position of the fixing post is fixed, as the angle between the telescopic rod and the protective shell changes, the telescopic rod hinged to the push rod extends, while the telescopic rod hinged to the locking block shortens. Because the longitudinal distance between the connection point of the telescopic rod and the locking block and the fixing post remains constant, as the telescopic rod shortens, the locking block also moves inward into the protective shell, causing the baffle to disengage from the locking block, allowing the sand inside the sand storage box to be quickly released into the inner shell.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a battery internal short circuit test device. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, battery safety issues are becoming increasingly prominent, with the risk of spontaneous combustion caused by internal short circuits being particularly critical. When an internal short circuit occurs, the electrodes come into direct contact, triggering a violent chemical reaction that releases a large amount of heat in a short period. This causes the battery temperature to rise sharply, exceeding the thermal runaway threshold and leading to spontaneous combustion. Because the short circuit occurs inside the battery, there are no obvious external signs initially, and the fire develops rapidly, making it difficult for traditional firefighting measures to intervene in time. This can easily lead to the fire spreading, posing a serious threat to equipment, personnel, and the environment. Therefore, developing a testing device that can simulate the internal short circuit process and accurately monitor temperature changes and combustion / explosion characteristics has become an important prerequisite for addressing this safety hazard.

[0003] Patent publication number CN209894942U discloses a battery internal short circuit test device, belonging to the technical field of testing equipment. It includes a chassis, with electric push rods installed at both ends of the two sets of fixing plates near the inside of the chassis. The limiting block is provided with multiple sets of soft rubber grooves on the side near the fixing plate. An air conditioner is provided at the top of the inside of the chassis. Multiple dryers are provided at the end of the inside of the chassis near the water pipe. A control panel is provided at the top of one end of the chassis.

[0004] To address the issues of existing devices not being able to handle all environments within a single device, being inconvenient for users, and having low practicality and efficiency in testing batteries, the current technology involves simultaneously conducting internal short-circuit tests on multiple batteries, using steel doors to effectively ensure worker safety. However, this method still presents the problem of batteries spontaneously combusting due to the increased internal temperature caused by the short circuit, making it impossible to extinguish the fire in a timely manner. Utility Model Content

[0005] The purpose of this invention is to provide a battery internal short-circuit test device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A battery internal short-circuit test device includes an outer shell, a shelf fixedly connected inside the outer shell, a lower cabinet door hinged to the bottom of the shelf, an outer cabinet door hinged to the front of the outer shell, a fixing buckle rotatably connected to the surface of the outer cabinet door, an observation window fixedly connected to the middle of the outer cabinet door, a sand storage tank fixedly connected to the top of the outer shell, a protective shell fixedly connected to the middle of the sand storage tank, baffles hinged to both sides of the sand storage tank, a push rod inserted inside the protective shell, and locking blocks inserted to both sides of the protective shell. The locking blocks are inclined from bottom to top away from the protective shell, and telescopic rods are hinged to the surfaces of the locking blocks and the push rod. A fixing column is rotatably connected to the middle of the two telescopic rods, and a spring is fixedly connected to the back of the push rod. The end of the spring is fixedly connected to the inner wall surface of the slide rail.

[0008] It also includes protective mechanisms, clamping mechanisms, puncture mechanisms, limiting mechanisms, and cleaning mechanisms;

[0009] The protective mechanism is used to enhance personnel protection and clean sand from inside the device in the event of battery combustion;

[0010] The clamping mechanism is used to secure the battery.

[0011] The puncture mechanism is used to puncture the battery to cause a short circuit inside it.

[0012] The limiting mechanism is used to adjust the puncture depth;

[0013] The cleaning mechanism is used to remove sand and soil from the crevices.

[0014] A further improvement of this utility model's technical solution is that: the protective mechanism includes an inner shell, which is fixedly connected to the top of the shelf. A sliding groove is provided on the front side of the inner shell, and a transparent sliding door is slidably connected inside the sliding groove. A test platform is fixedly connected to the bottom of the inner wall of the inner shell, and the test platform is inclined downwards from back to front. The bottom of the inner shell is inclined downwards from back to front and has a sand discharge hole on the front side. A sand collection hopper is fixedly connected to the bottom of the shelf, and the sand collection hopper is funnel-shaped. A valve is fixedly connected to the bottom of the sand collection hopper, and a collection box is provided at the bottom of the valve. The collection box is inserted into the interior of the outer shell.

[0015] A further improvement of this utility model is that the clamping mechanism includes a base plate, which is fixedly connected to the top of the test bench. A slide rail is fixedly connected to the top of the base plate. Clamping plates are symmetrically slidably connected to the front and rear sides of the slide rail. A screw is threadedly connected to the inside of the clamping plate. The threads on both sides of the screw rotate in opposite directions. Fixed teeth are fixedly connected to the surface of the clamping plate. The fixed teeth are inclined to the right. A support base is fixedly connected to the middle of the base plate. A battery is provided on the top of the support base. The screw is rotatably connected to the inside of the support base. A turntable is fixedly connected to the front of the screw.

[0016] A further improvement of the present invention is that the puncture mechanism includes a base, the base is fixedly connected to the top of the test bench, a cylinder is fixedly connected to the top of the base, a ceramic partition is fixedly connected to the output end of the cylinder, and a steel needle is fixedly connected to the left side of the ceramic partition.

[0017] A further improvement of the present invention is that the limiting mechanism includes a fixing groove, the fixing groove is opened on the surface of the test bench, a limiting plate is slidably connected inside the fixing groove, a fixing screw is threadedly connected to the surface of the limiting plate, a through hole is opened on the surface of the limiting plate, the steel needle is inserted into the through hole, a sliding groove is opened on the surface of the test bench, and the limiting plate is slidably connected inside the sliding groove.

[0018] A further improvement of the present invention is that the cleaning mechanism includes an air pump, which is disposed on the side of the outer casing. The output end of the air pump is fixedly connected to a connecting pipe, and the end of the connecting pipe is fixedly connected to a nozzle.

[0019] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0020] 1. This utility model provides a battery internal short-circuit test device, which employs an outer shell, shelves, outer cabinet door, fixing buckle, observation window, lower cabinet door, inner shell, transparent sliding door, sand discharge hole, sand collection hopper, valve, collection box, test platform, sand storage box, protective shell, baffle, push rod, telescopic rod, fixed column, locking block, spring, air pump, connecting pipe, and nozzle in cooperation. By pressing the push rod, the push rod drives the telescopic rod to move. As the push rod moves, the angle between the telescopic rod and the protective shell continuously decreases. Since the position of the fixed column is fixed, as the angle between the telescopic rod and the protective shell changes, the telescopic rod hinged to the push rod extends, while the telescopic rod hinged to the locking block shortens. The connection between the telescopic rod and the locking block and the fixed column... The longitudinal distance between them remains unchanged. Therefore, as the telescopic rod shortens, the locking block will also move inward into the protective shell, causing the baffle to detach from the locking block. This allows the sand inside the sand storage box to be quickly released into the inner shell, thus enabling rapid fire extinguishing when the battery short-circuits and catches fire. After confirming safety, the valve is opened to discharge the sand inside the device through the sand discharge hole into the collection box for recycling. After the battery is exposed and safety is confirmed again, the two cabinet doors are opened, and the air pump is started to blow out the sand in the gaps for use in the next experiment. After the sand is collected, the baffle is pressed upward, and the baffle squeezes the locking block inward. When the baffle passes the locking block, the elasticity of the spring is used to make the locking block rebound and fix the baffle.

[0021] 2. This utility model provides a battery internal short circuit testing device, which employs a base plate, slide rail, clamping plate, screw, turntable, fixing teeth, support base, battery, base, cylinder, ceramic partition, steel needle, fixing groove, limiting plate, fixing screw, through hole, and slide groove in cooperation. By rotating the fixing buckle, the outer cabinet door is opened, and then the two transparent sliding doors are slid to the same side. The push rod rotates the turntable, causing the screw to rotate inside the support base. The rotation of the screw causes the clamping plate to slide on the slide rail, thereby making the two clamping plates move away from each other. Then, the battery is inserted, and the turntable is reversed, causing the two clamping plates to move closer together, thus achieving the test of the battery internal short circuit. The battery is clamped, and then the transparent sliding door is moved to the other side. The fixing screws are loosened to adjust the limiting plate to the appropriate position, and then the fixing screws are tightened. The friction between the bottom of the fixing screw and the fixing groove of the push rod fixes the position of the limiting plate. Then the two cabinet doors are closed, and then the cylinder is activated. The cylinder drives the steel needle to extend to the left to puncture the battery. When the ceramic separator contacts the limiting plate, the cylinder stops extending, thereby controlling the puncture depth and simulating the real scenario of a metal foreign object penetrating the separator. By setting a sufficient puncture depth, it is ensured that the steel needle contacts the positive and negative electrodes at the same time to form a stable short-circuit circuit. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the battery internal short-circuit test device of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the protection mechanism of this utility model;

[0025] Figure 4 This is a schematic diagram of the clamping mechanism of this utility model;

[0026] Figure 5 This is a schematic diagram of the protective mechanism of this utility model;

[0027] Figure 6 This is a schematic diagram of the internal structure of the protective shell of this utility model.

[0028] In the diagram: 2. Protective mechanism; 4. Clamping mechanism; 6. Puncture mechanism; 7. Limiting mechanism; 8. Cleaning mechanism; 11. Outer shell; 12. Shelf; 13. Outer cabinet door; 14. Fixing buckle; 15. Observation window; 16. Lower cabinet door; 21. Inner shell; 22. Transparent sliding door; 23. Sand discharge hole; 24. Sand collection hopper; 25. Valve; 26. Collection box; 27. Test bench; 31. Sand storage box; 32. Protective shell; 33. Baffle; 34. Push rod; 35. Telescopic rod; 36. Fixed column; 37. Clamping block; 38. Spring; 41. Base plate; 42. Slide rail; 43. Clamping plate; 44. Screw; 45. Turntable; 46. Fixed tooth; 47. Support base; 51. Battery; 61. Base; 62. Cylinder; 63. Ceramic partition; 64. Steel needle; 71. Fixed groove; 72. Limiting plate; 73. Fixing screw; 74. Through hole; 75. Slide groove; 81. Air pump; 82. Connecting pipe; 83. Nozzle. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments:

[0030] Example 1

[0031] like Figure 1-6As shown, this utility model provides a battery internal short circuit test device, including an outer shell 11, a shelf 12 fixedly connected inside the outer shell 11, a lower cabinet door 16 hinged to the bottom of the shelf 12, an outer cabinet door 13 hinged to the front of the outer shell 11, a fixing buckle 14 rotatably connected to the surface of the outer cabinet door 13, an observation window 15 fixedly connected to the middle of the outer cabinet door 13, a sand storage tank 31 fixedly connected to the top of the outer shell 11, a protective shell 32 fixedly connected to the middle of the sand storage tank 31, baffles 33 hinged to both sides of the sand storage tank 31, a push rod 34 inserted inside the protective shell 32, and locking blocks 37 inserted on both sides of the protective shell 32, with the locking blocks 37 moving away from the protective shell 32 from bottom to top. One side is tilted, and the surfaces of the locking block 37 and the push rod 34 are hinged with telescopic rods 35. The middle of the two telescopic rods 35 is rotatably connected to a fixed column 36. The back of the push rod 34 is fixed with a spring 38, and the end of the spring 38 is fixed to the inner wall surface of the slide rail 42. It also includes a protection mechanism 2, a clamping mechanism 4, a puncture mechanism 6, a limiting mechanism 7, and a cleaning mechanism 8. The protection mechanism 2 is used to enhance the protection of personnel and clean the sand inside the device when the battery burns. The clamping mechanism 4 is used to fix the battery. The puncture mechanism 6 is used to puncture the battery to cause a short circuit inside. The limiting mechanism 7 is used to adjust the puncture depth. The cleaning mechanism 8 is used to clean the sand in the gaps. The protective mechanism 2 includes an inner shell 21, which is fixed to the top of the shelf 12. A sliding groove is provided on the front side of the inner shell 21, and a transparent sliding door 22 is slidably connected inside the groove. A test platform 27 is fixed to the bottom of the inner wall of the inner shell 21, and the test platform 27 tilts downwards from back to front. The bottom of the inner shell 21 tilts downwards from back to front and has a sand discharge hole 23 on the front side. A sand collection hopper 24, which is funnel-shaped, is fixed to the bottom of the sand collection hopper 24. A valve 25 is fixed to the bottom of the sand collection hopper 24, and a collection box 26 is provided at the bottom of the valve 25. The collection box 26 is inserted into the interior of the outer shell 11. The cleaning mechanism 8 includes an air pump 81, which is located on the side of the outer shell 11. A connecting pipe 82 is fixed to the output end of the air pump 81, and a nozzle 83 is fixed to the end of the connecting pipe 82.

[0032] In this embodiment, by pressing the push rod 34, the push rod 34 drives the telescopic rod 35 to move. As the push rod 34 moves, the angle between the telescopic rod 35 and the protective shell 32 continuously decreases. Since the position of the fixed post 36 is fixed, as the angle between the telescopic rod 35 and the protective shell 32 changes, the telescopic rod 35 hinged to the push rod 34 extends, while the telescopic rod 35 hinged to the locking block 37 shortens. Since the longitudinal distance between the connection point of the telescopic rod 35 and the locking block 37 and the fixed post 36 remains unchanged, as the telescopic rod 35 shortens, the locking block 37 also moves inward into the protective shell 32, thereby causing the baffle 33 to disengage from the locking block 37, thus allowing the sand storage to proceed. The sand inside the box 31 is quickly released into the inner shell 21, thus enabling rapid fire extinguishing when the battery 51 short-circuits and catches fire. After confirming safety, the valve 25 is opened to discharge the sand inside the device through the sand discharge hole 23 into the collection box 26 for recycling. After the battery is exposed and safety is confirmed again, the two cabinet doors are opened and the air pump 81 is started to blow out the sand in the gaps for use in the next experiment. After the sand is collected, the baffle 33 is pressed upwards, and the baffle 33 squeezes the locking block 37 to move inwards. When the baffle 33 passes the locking block 37, the locking block 37 rebounds due to the elasticity of the spring 38, thereby fixing the baffle 33.

[0033] Example 2

[0034] like Figure 1-6 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the clamping mechanism 4 includes a base plate 41, which is fixedly connected to the top of the test bench 27. A slide rail 42 is fixedly connected to the top of the base plate 41. Clamping plates 43 are symmetrically slidably connected to the front and rear sides of the slide rail 42. A screw 44 is threadedly connected to the inside of the clamping plate 43. The threads on both sides of the screw 44 rotate in opposite directions. Fixing teeth 46 are fixedly connected to the surface of the clamping plate 43. The fixing teeth 46 are inclined to the right. A support base 47 is fixedly connected to the middle of the base plate 41. A battery 51 is provided on the top of the support base 47. The screw 44 is rotatably connected to the inside of the support base 47. A turntable 45 is fixedly connected to the front of the screw 44. The piercing mechanism 6 includes a base 61, which is fixedly connected to the top of the test bench 27. A cylinder 62 is fixedly connected to the top of the base 61. A ceramic partition 63 is fixedly connected to the output end of the cylinder 62. A steel needle 64 is fixedly connected to the left side of the ceramic partition 63. The limiting mechanism 7 includes a fixing groove 71, which is formed on the surface of the test bench 27. A limiting plate 72 is slidably connected inside the fixing groove 71. A fixing screw 73 is threadedly connected to the surface of the limiting plate 72. A through hole 74 is formed on the surface of the limiting plate 72, and a steel needle 64 is inserted into the through hole 74. A sliding groove 75 is formed on the surface of the test bench 27, and the limiting plate 72 is slidably connected inside the sliding groove 75.

[0035] In this embodiment, by rotating the fixing buckle 14, the outer cabinet door 13 is opened, and then the two transparent sliding doors 22 are slid to the same side. The push rod rotates the turntable 45, causing the screw 44 to rotate inside the support base 47. The rotation of the screw 44 causes the clamping plate 43 to slide on the slide rail 42, thereby making the two clamping plates 43 move away from each other. Then, the battery 51 is inserted, and the turntable 45 is reversed, causing the two clamping plates 43 to move closer together, thereby clamping the battery 51. Then, the transparent sliding door 22 is moved to the other side, and the fixing screw 73 is loosened to adjust the limiting plate 72 to the desired position. Position the device appropriately, then tighten the fixing screw 73. The friction between the bottom of the fixing screw 73 and the fixing groove 71 fixes the position of the limiting plate 72. Then close the two cabinet doors and start the cylinder 62. The cylinder 62 drives the steel needle 64 to extend to the left to pierce the battery 51. When the ceramic separator 63 contacts the limiting plate 72, the cylinder 62 stops extending, thereby controlling the piercing depth and simulating the real scenario of a metal foreign object penetrating the separator. By setting a sufficient piercing depth, it is ensured that the steel needle contacts the positive and negative electrode plates simultaneously, forming a stable short-circuit circuit.

[0036] The working principle of the battery internal short circuit test device will be explained in detail below.

[0037] like Figure 1-6As shown, by rotating the fixing buckle 14, the outer cabinet door 13 is opened, and then the two transparent sliding doors 22 are slid to the same side. The push rod rotates the turntable 45, which drives the screw 44 to rotate inside the support base 47. The rotation of the screw 44 drives the clamping plate 43 to slide on the slide rail 42, thereby making the two clamping plates 43 move away from each other. Then, the battery 51 is inserted, and the turntable 45 is reversed, making the two clamping plates 43 move closer together, thereby clamping the battery 51. Then, the transparent sliding door 22 is moved to the other side, the fixing screw 73 is loosened to adjust the limiting plate 72 to the appropriate position, and then the fixing screw is tightened. 73. The friction between the bottom of the push rod fixing screw 73 and the fixing groove 71 fixes the position of the limiting plate 72. Then, the two cabinet doors are closed, and the cylinder 62 is activated. The cylinder 62 drives the steel needle 64 to extend to the left to pierce the battery 51. When the ceramic separator 63 contacts the limiting plate 72, the cylinder 62 stops extending, thereby controlling the piercing depth and simulating the real scenario of a metal foreign object penetrating the separator. By setting a sufficient piercing depth, it is ensured that the steel needle contacts the positive and negative electrode plates simultaneously, forming a stable short-circuit circuit. By pressing the push rod 34, the push rod 34 drives the telescopic rod 35 to move. As rod 34 moves, the angle between telescopic rod 35 and protective shell 32 continuously decreases. Since the position of fixed post 36 is fixed, as the angle between telescopic rod 35 and protective shell 32 changes, the telescopic rod 35 hinged to push rod 34 extends, while the telescopic rod 35 hinged to latch block 37 shortens. Since the longitudinal distance between the connection point of telescopic rod 35 and latch block 37 and fixed post 36 remains constant, as telescopic rod 35 shortens, latch block 37 also moves inward into protective shell 32, causing baffle 33 to disengage from latch block 37, allowing sand inside sand storage box 31 to be quickly released into inner shell. Inside 21, the device can quickly extinguish a fire when the battery 51 short-circuits and catches fire. After confirming safety, the valve 25 is opened to discharge the sand inside the device through the sand discharge hole 23 into the collection box 26 for recycling. After the battery is exposed and safety is confirmed again, the two cabinet doors are opened and the air pump 81 is started to blow out the sand in the gaps for use in the next experiment. After the sand is collected, the baffle 33 is pressed upwards, and the baffle 33 squeezes the locking block 37 to move inwards. When the baffle 33 passes the locking block 37, the locking block 37 rebounds due to the elasticity of the spring 38, thereby fixing the baffle 33.

[0038] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A battery internal short-circuit test device, comprising a housing (11), characterized in that: The outer shell (11) is internally fixed with a shelf (12), the bottom of the shelf (12) is hinged with a lower cabinet door (16), the front of the outer shell (11) is hinged with an outer cabinet door (13), the surface of the outer cabinet door (13) is rotatably connected with a fixing buckle (14), the middle of the outer cabinet door (13) is fixed with an observation window (15), the top of the outer shell (11) is fixed with a sand storage box (31), the middle of the sand storage box (31) is fixed with a protective shell (32), and the two sides of the sand storage box (31) are hinged with baffles ( ). 33), a push rod (34) is inserted inside the protective shell (32), and a locking block (37) is inserted on both sides of the protective shell (32). The locking block (37) is inclined from bottom to top away from the protective shell (32). A telescopic rod (35) is hinged to the surface of the locking block (37) and the push rod (34). A fixed column (36) is rotatably connected to the middle of the two telescopic rods (35). A spring (38) is fixed to the back of the push rod (34). The end of the spring (38) is fixed to the inner wall surface of the slide rail (42). It also includes a protective mechanism (2), a clamping mechanism (4), a puncture mechanism (6), a limiting mechanism (7), and a cleaning mechanism (8); The protective mechanism (2) is used to enhance personnel protection and clean up sand inside the device when the battery burns; The clamping mechanism (4) is used to fix the battery; The puncture mechanism (6) is used to puncture the battery to cause a short circuit inside it; The limiting mechanism (7) is used to adjust the puncture depth; The cleaning mechanism (8) is used to clean the sand and soil in the gaps.

2. The battery internal short-circuit test device according to claim 1, characterized in that: The protective mechanism (2) includes an inner shell (21), which is fixed to the top of the shelf (12). A sliding groove is provided on the front side of the inner shell (21). A transparent sliding door (22) is slidably connected inside the sliding groove of the inner shell (21). A test bench is fixed to the bottom of the inner wall of the inner shell (21). The test bench (27) is inclined from back to front and downward. The bottom of the inner shell (21) is inclined from back to front and downward and has a sand discharge hole (23) on the front side. A sand collection hopper (24) is fixed to the bottom of the shelf (12). The sand collection hopper (24) is funnel-shaped. A valve (25) is fixed to the bottom of the sand collection hopper (24). A collection box (26) is provided at the bottom of the valve (25). The collection box (26) is inserted into the inside of the outer shell (11).

3. The battery internal short-circuit test device according to claim 2, characterized in that: The clamping mechanism (4) includes a base plate (41), which is fixed to the top of the test bench (27). A slide rail (42) is fixed to the top of the base plate (41). Clamping plates (43) are symmetrically slidably connected to the front and rear sides of the slide rail (42). A screw (44) is connected to the internal thread of the clamping plate (43). The threads on both sides of the screw (44) rotate in opposite directions. A fixing tooth (46) is fixed to the surface of the clamping plate (43). The fixing tooth (46) is tilted to the right. A support seat (47) is fixed to the middle of the base plate (41). A battery (51) is provided on the top of the support seat (47). The screw (44) is rotatably connected to the inside of the support seat (47). A turntable (45) is fixed to the front of the screw (44).

4. The battery internal short-circuit test device according to claim 2, characterized in that: The puncture mechanism (6) includes a base (61) which is fixed to the top of the test bench (27). A cylinder (62) is fixed to the top of the base (61). A ceramic partition (63) is fixed to the output end of the cylinder (62). A steel needle (64) is fixed to the left side of the ceramic partition (63).

5. The battery internal short-circuit test device according to claim 4, characterized in that: The limiting mechanism (7) includes a fixing groove (71), which is opened on the surface of the test bench (27). A limiting plate (72) is slidably connected inside the fixing groove (71). A fixing screw (73) is threadedly connected to the surface of the limiting plate (72). A through hole (74) is opened on the surface of the limiting plate (72). A steel needle (64) is inserted into the through hole (74). A sliding groove (75) is opened on the surface of the test bench (27). The limiting plate (72) is slidably connected inside the sliding groove (75).

6. The battery internal short-circuit test device according to claim 1, characterized in that: The cleaning mechanism (8) includes an air pump (81), which is located on the side of the outer casing (11). The output end of the air pump (81) is fixedly connected to a connecting pipe (82), and the end of the connecting pipe (82) is fixedly connected to a nozzle (83).

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