Lithium ion battery internal resistance detection tool

Abstract

The invention discloses a lithium ion battery internal resistance detection tool, and relates to the technical field of lithium ion battery production, the lithium ion battery internal resistance detection tool comprises a material disc, the material disc is used for placing a plurality of rows of lithium ion batteries, the material disc comprises a plurality of linearly distributed transverse blocks, the transverse blocks are rotatably provided with a plurality of bottom plates through rotating shafts, the bottom plates are used for placing the lithium ion batteries, and the bottom plates are used for placing the lithium ion batteries. A supporting plate is fixed to the end, close to one side of the transverse block, of the bottom plate, and a spring used for supporting the weight of the lithium ion battery is arranged between the supporting plate and the transverse block. And the detection mechanism is mounted at the execution end of the external mechanical arm. According to the invention, the internal resistance of the lithium ion battery can be produced and detected on a large scale, manual operation steps are reduced through an automatic detection process, the detection speed and the production efficiency are remarkably improved, meanwhile, the automatic design of the tool can realize a rapid and accurate test process, and the production efficiency is further optimized.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery production, and in particular to a lithium ion battery internal resistance detection tool. Background Art

[0002] When the current passes through the lithium-ion battery, it encounters resistance, which reduces the working voltage of the lithium-ion battery. This resistance is called the internal resistance of the lithium-ion battery. Due to the internal resistance, the terminal voltage of the lithium-ion battery during discharge is lower than its own electromotive force and open circuit voltage. When charging, the terminal voltage is higher than the electromotive force and open circuit voltage. The internal resistance of the lithium-ion battery is not a constant. It changes during the discharge process due to the composition of the active material, the concentration of the electrolyte, the temperature of the lithium-ion battery, and the discharge time. The internal resistance of the lithium-ion battery affects the working voltage, working current, output energy and power of the lithium-ion battery. The smaller the internal resistance of the lithium-ion battery, the better. In order to ensure the consistency of the specifications of the lithium-ion battery, it is necessary to test the internal resistance of the lithium-ion battery.

[0003] The commonly used method at present is to directly contact the two test leads of the voltage resistance meter with the positive and negative electrodes of the lithium-ion battery to be tested, and observe the reading of the voltage resistance meter. For testing large quantities of products, this operation method is very cumbersome, slows down the detection speed, and is not conducive to mass production. Summary of the invention

[0004] The purpose of the present invention is to provide a lithium ion battery internal resistance detection tool to solve the current problem of low efficiency in detecting the internal resistance of lithium ion batteries.

[0005] The present invention solves the above technical problems through the following technical solutions, which include: A material tray, the material tray is used to place multiple rows of lithium-ion batteries, the material tray includes multiple linearly distributed horizontal blocks, multiple bottom plates are rotatably mounted on the horizontal blocks through a rotating shaft, the bottom plates are used to place lithium-ion batteries, a support plate is fixed to the end of the bottom plate close to one side of the horizontal block, and a spring for supporting the weight of the lithium-ion battery is arranged between the support plate and the horizontal block; A detection mechanism, which is installed at the execution end of the external robot arm and is used to grab and displace the material tray and to detect the internal resistance of the lithium-ion battery on the material tray when it is powered on; A picking mechanism, the picking mechanism is located at the lower side of the horizontal block, the picking mechanism is used to support and position the material tray and pick out the lithium-ion batteries with unqualified internal resistance on the material tray to make them fall, the picking mechanism includes an electric slide member arranged at the lower side of the horizontal block and an electric push rod installed at the moving end of the electric slide member, a rubber head is fixed at the telescopic end of the electric push rod, and the electric slide member is used to drive the rubber head to move; A receiving mechanism, which is arranged at the lower side of the electric slide of the selection mechanism and is used to receive the fallen defective lithium-ion batteries; When the detection mechanism detects a lithium-ion battery with an internal resistance that does not meet the standard, the electric slide drives the rubber head to move to the lower side of the support plate corresponding to the lithium-ion battery, and the output end of the electric push rod extends to push the bottom plate to tilt, and the lithium-ion battery slides onto the receiving mechanism, thereby realizing automatic selection of lithium-ion batteries with internal resistance that does not meet the standard.

[0006] Preferably, a fixing piece is provided on the horizontal block, and when the bottom plate flips downward along the rotation axis, the fixing piece delays locking of the support plate to ensure that the lithium-ion battery falls smoothly; The fixing member includes a vertical rod connected to the support plate through a connecting rope, a fixing through hole is provided on the horizontal block, a rubber ring is provided on the upper half of the fixing through hole, the upper end of the vertical rod extends to the lower half of the fixing through hole, and the inner hole diameter of the rubber ring is smaller than the diameter of the vertical rod, a translation block is slidably provided on the upper side of the horizontal block, a first groove corresponding to the fixing through hole is provided on the lower side of the translation block, and a first inclined surface is provided on the top of the first groove along the length direction of the translation block.

[0007] Preferably, the detection mechanism includes a mounting plate, on the lower side of which two movable racks and a driving member for driving the two movable racks to move are slidably provided, the two movable racks each having multiple rows of vertical plates, the vertical plates having elastic terminals, the corresponding elastic terminals on the two movable racks are respectively located on both sides of the corresponding lithium-ion batteries, the elastic terminals are used to electrically contact the electrodes of the lithium-ion batteries, and the elastic terminals are connected to an external internal resistance detector to realize internal resistance detection.

[0008] Preferably, a clamping block is fixed on the vertical plate, a second groove is opened on the side of the translation block, the second groove has a second inclined surface, and the second inclined surface is arranged opposite to the first inclined surface.

[0009] Preferably, the driving member includes a first motor fixed on the mounting plate, a gear is fixed to the output end of the first motor, racks are fixed to the two moving frames, and the two racks are meshed with the gear.

[0010] Preferably, the selection mechanism further comprises a bottom frame, the electric slide comprises an optical axis fixed to the bottom frame and a screw rod rotatably mounted on the bottom frame, a second motor driving the screw rod to rotate is fixed to the outer side of the bottom frame, a moving rod is threadedly connected to the screw rod, and the moving rod is slidably connected to the optical axis; The electric push rods are installed on the moving rods, and the number of the electric push rods is the same as the number of rows of lithium-ion batteries, and the moving tracks of the multiple electric push rods correspond to the multiple rows of support plates respectively.

[0011] Preferably, the material tray also includes an outer frame, and the plurality of horizontal blocks are evenly fixed to the inner wall of the outer frame, at least two first positioning pins are fixed to the upper side of the outer frame, and positioning holes corresponding to the first positioning pins are opened on the lower side of the outer frame, and second positioning pins corresponding to the positioning holes are fixed to the upper side of the bottom frame.

[0012] Preferably, the material receiving mechanism comprises an inclined guide plate arranged at the lower side of the selection mechanism, and a material box is arranged on one side of the lower end of the inclined guide plate.

[0013] Preferably, a winding mechanism is provided at the lower end of the inclined guide plate, which is used to stick an identification ring on the periphery of a lithium-ion battery with poor internal resistance. The winding mechanism includes a mounting cross plate and a mounting rod fixed to the inclined guide plate by a bracket, and a plurality of winding rolls are installed on the mounting cross plate through a mounting support. A plurality of flip blocks are rotatably installed on the mounting rod, and the plurality of winding rolls correspond to the plurality of flip blocks respectively. A torsion spring for driving the flip blocks to flip upward is sleeved on the mounting rod, and L-shaped blocks are provided on both sides of the upper surface of the flip blocks. The winding roll is formed by a plurality of winding segments that can be disconnected and connected in sequence, and the winding segments pass through the L-shaped blocks and extend to the end of the flip blocks.

[0014] Preferably, a first adhesive area is provided on the upper surface of the head end of the winding section, a second adhesive area is provided on the upper surface of the tail end, a notch is provided at the center of the tail end of the winding section, and a protrusion corresponding to the notch is fixed on the lower side of the end of the flip block.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention can be used to mass produce and detect the internal resistance of lithium-ion batteries. Through the automated detection process, the manual operation steps are reduced, and the detection speed and production efficiency are significantly improved. At the same time, the automated design of the tooling can realize a fast and accurate testing process, further optimizing the production efficiency. The present invention is equipped with automatic screening and collection of lithium-ion batteries with substandard internal resistance, which not only improves the efficiency of quality control, but also reduces the error of manual screening; The present invention can wrap a winding section for marking and buffering on the outer side of the selected lithium-ion battery, which can effectively prevent the battery from being damaged due to collision during the detection process, not only protecting the appearance of the battery, but also reducing the defective rate caused by appearance defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the detection mechanism; Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the middle material tray; Figure 4 for Figure 3 A schematic diagram of a cross-sectional structure from a local first-person perspective; Figure 5 for Figure 3 A schematic diagram of a partial cross-sectional structure from a second viewing angle; Figure 6 is a schematic diagram of a top-down cross-sectional structure of a second groove; Figure 7 for Figure 1 A schematic diagram of the three-dimensional structure of the selection mechanism; Figure 8 for Figure 1 A schematic cross-sectional view of the middle inclined guide plate, the material box and the winding mechanism; Fig. 9 for Figure 1 Schematic diagram of the three-dimensional structure of the winding mechanism.

[0017] The numbers in the figure represent: 1-detection mechanism; 11-movable frame; 12-vertical plate; 13-clamping block; 14-elastic terminal; 15-first motor; 16-gear; 17-rack; 18-slideway; 19-slider; 110-second groove; 2-tray; 21-outer frame; 22-cross block; 23-bottom plate; 24-support plate; 25-spring; 26-storage station; 261-limiting block; 271-vertical rod; 272-rubber ring; 273-translation block; 274-first groove; 275-connecting rope; 28-first positioning pin; 3-selection mechanism; 31-bottom frame; 32-second positioning pin; 33-second motor; 34-screw rod; 35-moving rod; 36-electric push rod; 37-rubber head; 38-optical axis; 41- inclined guide plate; 42- material box; 5-winding mechanism; 51-mounting horizontal plate; 52-winding roll; 521-first adhesive area; 522-second adhesive area; 523-notch; 53-mounting rod; 54-turning block; 55-protrusion; 56-torsion spring; 57-L-shaped stopper; 6- Lithium-ion battery. DETAILED DESCRIPTION

[0018] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0019] This embodiment provides a technical solution: a lithium-ion battery internal resistance detection tool, such as Figures 1 to 9 As shown, it includes a material tray 2, a detection mechanism 1, a selection mechanism 3, a winding mechanism 5 and a material receiving mechanism.

[0020] The material tray 2 is used to place multiple rows of lithium-ion batteries 6. The material tray 2 includes an outer frame 21, and a plurality of linearly distributed horizontal blocks 22 are arranged inside the outer frame 21. The plurality of horizontal blocks 22 are rotatably mounted on the bottom plate 23 of the horizontal block 22 through a rotating shaft. The bottom plate 23 is a plate with an arc structure. The bottom plate 23 is the part where the lithium-ion batteries 6 are placed. There are raised isolation parts on both sides of the bottom plate 23. The isolation parts are fixed to the horizontal block 22, and one isolation part and the corresponding horizontal block 22 together form a storage station 26. A support plate 24 is fixed to the end of the bottom plate 23 close to one side of the horizontal block 22, and a spring 25 for supporting the weight of the lithium-ion battery 6 is arranged between the support plate 24 and the horizontal block 22.

[0021] When the lithium-ion battery 6 is placed in the bottom plate 23, the spring 25 can support the weight of the lithium-ion battery 6 to ensure that the bottom plate 23 is in a parallel state. In order to locate the position of the lithium-ion battery 6, two limiting blocks 261 can be fixed on the inner side of the isolation portion. The lithium-ion battery 6 is placed on the bottom plate 23 between the two limiting blocks 261 so that there is a certain gap between the lithium-ion battery 6 and the cross block 22.

[0022] A fixing piece is provided on the horizontal block 22. When the bottom plate 23 flips downward along the rotating shaft, the support plate 24 will tilt upward. At this time, the fixing piece delays the locking of the support plate 24, and the bottom plate 23 can maintain an inclined state for a certain period of time to ensure that the lithium-ion battery 6 falls smoothly, so as to pick out the lithium-ion battery 6 with poor internal resistance, thereby achieving the effect of automatically picking out the poor lithium-ion battery 6.

[0023] The fixing part includes a vertical rod 271 connected to the support plate 24 through a connecting rope 275. The setting of the connecting rope 275 can make the vertical rod 271 and the support plate 24 always maintain a soft connection state. A fixing through hole is opened on the cross block 22, and a rubber ring 272 is provided on the upper half of the fixing through hole. The rubber ring 272 has a certain deformation ability. The upper end of the vertical rod 271 extends to the lower half of the fixing through hole, and the inner hole diameter of the rubber ring 272 is smaller than the diameter of the vertical rod 271. When the vertical rod 271 moves upward and is inserted into the inner hole of the rubber ring 272, the force generated by the deformation of the rubber ring 272 will exert a certain clamping force on the vertical rod 271. A translation block 273 is slidingly provided on the upper side of the cross block 22, and the translation block 273 slides along the length direction of the cross block 22. The two can be slidably connected through a T-shaped sliding structure to prevent the two from falling off. A first groove 274 corresponding to the fixing through hole is formed on the lower side of the translation block 273 , and a first inclined surface is formed on the top of the first groove 274 along the length direction of the translation block 273 .

[0024] If a lithium-ion battery 6 with substandard internal resistance is detected, the corresponding support plate 24 can be pushed upward by the selection mechanism 3, so that the vertical rod 271 moves upward, and the upper end of the vertical rod 271 passes through the inner hole of the rubber ring 272 and extends into the first groove 274. The vertical rod 271 will contact the first inclined surface of the first groove 274, and the translation block 273 will be moved, and the vertical rod 271 will move to the non-inclined part of the first groove 274. At the same time, the bottom plate 23 will be in an inclined state, and the lithium-ion battery 6 will slide to the receiving mechanism due to the action of gravity, so as to select the lithium-ion battery 6 with substandard internal resistance. Since the lithium-ion battery 6 has been discharged, the force on the bottom plate 23 will be reduced, and the clamping force of the rubber ring 272 on the vertical rod 271 cannot resist the downward force of the spring 25 on the support plate 24, so that the support plate 24 and the bottom plate 23 gradually flip to their original positions.

[0025] The detection mechanism 1 is used to grab and displace the tray 2 and to detect the internal resistance of the lithium-ion battery 6 on the tray 2 by powering on. It should be noted that the detection mechanism 1 is installed on an external truss or the execution end of a robotic arm to achieve movement, thereby grabbing and displacing the tray 2.

[0026] The detection mechanism 1 includes a mounting plate, on the lower side of which two mobile frames 11 and a driving member for driving the two mobile frames 11 to move are slidably arranged, a slide groove 18 is provided on the mobile frame 11, a slider 19 is slidably arranged in the slide groove 18, and the slider 19 is fixed to the mounting plate, and the moving directions of the two mobile frames 11 are approaching or moving away from each other, and the two mobile frames 11 each have a plurality of rows of vertical plates 12, and the vertical plates 12 have elastic terminals 14, and the corresponding elastic terminals 14 on the two mobile frames 11 are respectively located on both sides of the corresponding lithium-ion batteries 6, and the elastic terminals 14 are used to make electrical contact with the electrodes of the lithium-ion batteries 6, and the elastic terminals 14 are connected to an external internal resistance detector to realize the detection of internal resistance.

[0027] The driving member includes a first motor 15 fixed on the mounting plate, a gear 16 is fixed to the output end of the first motor 15, racks 17 are fixed to the two moving frames 11, the two racks 17 are meshed and connected with the gear 16, and the two racks 17 are symmetrically arranged.

[0028] When the lithium-ion battery 6 is tested, the first motor 15 is operated to drive the gear 16 to rotate, and in cooperation with the two racks 17, the two movable frames 11 are brought close to each other, so that the corresponding elastic terminals 14 are in contact with the corresponding electrodes of the lithium-ion battery 6, and the internal resistance can be tested.

[0029] A clamping block 13 is fixed on the vertical plate 12 and is located at a side away from the elastic terminal 14 . A second groove 110 is formed on the side of the translation block 273 and has a second inclined surface that is opposite to the first inclined surface.

[0030] When the material tray 2 is clamped by the detection mechanism 1, the clamping block 13 is driven by the driving member to move to one side of the translation block 273, and the clamping block 13 will enter the second groove 110. Since the vertical rod 271 will displace the translation block 273 when it moves upward, when the detection mechanism 1 clamps the material tray 2, the clamping block 13 will contact the second inclined surface, and the translation block 273 can be displaced, so that the translation block 273 returns to its original position, and the vertical rod 271 that has not fallen down can be pushed down and moved downward by the first inclined surface, avoiding the remaining vertical rod 271 in the first groove 274.

[0031] The picking mechanism 3 is used to support and position the material tray 2 and to pick out the lithium-ion batteries 6 with unqualified internal resistance on the material tray 2 and make them fall; the picking mechanism 3 includes a bottom frame 31. In order to prevent the fallen lithium-ion batteries 6 from interfering with the edge of the bottom frame 31, a support frame is provided at the upper center position of the bottom frame 31 for setting up the material tray 2.

[0032] An optical axis 38 and a lead screw 34 are fixed in the inner frame of the bottom frame 31, and a second motor 33 for driving the lead screw 34 to rotate is fixed on the outer side of the bottom frame 31. A moving rod 35 is threadedly connected to the lead screw 34, and the moving rod 35 is slidably connected to the optical axis 38. When the second motor 33 is running, the lead screw 34 is driven to rotate, which further causes the moving rod 35 to move along the lead screw 34.

[0033] A plurality of electric push rods 36 are fixed on the moving rod 35 via a mounting seat. A rubber head 37 is fixed to the telescopic end of the electric push rod 36 , and the moving tracks of the plurality of electric push rods 36 correspond to the plurality of rows of support plates 24 .

[0034] When it is detected that the internal resistance of the lithium-ion battery 6 does not meet the standard, the second motor 33 is operated to move the rubber head 37 to the position of the support plate 24 corresponding to the lithium-ion battery 6 whose internal resistance does not meet the standard, and the corresponding telescopic end of the electric push rod 36 is extended, so that the rubber head 37 moves the support plate 24 upward, and the support plate 24 will be stuck in the inner hole of the rubber ring 272, the bottom plate 23 is in an inclined state, and the corresponding lithium-ion battery 6 slides onto the material receiving mechanism.

[0035] At least two first positioning pins 28 are fixed on the upper side of the outer frame 21, and positioning holes corresponding to the first positioning pins 28 are opened on the lower side of the outer frame 21, so that the material trays 2 can be stacked one by one by cooperating with the first positioning pins 28 and the positioning holes, and second positioning pins 32 corresponding to the positioning holes are fixed on the upper side of the bottom frame 31, so that the material trays 2 can be positioned on the selection mechanism 3.

[0036] The material receiving mechanism is arranged at the lower side of the selecting mechanism 3, and is used to receive the fallen defective lithium-ion batteries 6. The material receiving mechanism includes an inclined guide plate 41 arranged at the lower side of the selecting mechanism 3. A rubber buffer layer is arranged on the upper surface of the inclined guide plate 41, and a material box 42 is arranged on one side of the lower end of the inclined guide plate 41. The lithium-ion batteries 6 that do not meet the internal resistance standards will roll downward along with the inclined guide plate 41, and finally roll and fall into the material box 42 for storage.

[0037] A winding mechanism 5 is provided at the lower end of the inclined guide plate 41, which is used to stick an identification ring on the periphery of the lithium-ion battery 6 with poor internal resistance. The identification ring has two functions. The first is to identify the lithium-ion battery 6 as a product with unsatisfactory internal resistance. The second is to have a partition effect, reduce the impact force between two adjacent lithium-ion batteries 6, and avoid damage to the lithium-ion battery 6.

[0038] The winding mechanism 5 includes a mounting cross plate 51 and a mounting rod 53 fixed to the inclined guide plate 41 through a bracket, a plurality of winding rolls 52 are mounted on the mounting cross plate 51 through a mounting support, a plurality of flip blocks 54 are rotatably mounted on the mounting rod 53, and the plurality of winding rolls 52 correspond to the plurality of flip blocks 54 respectively, a torsion spring 56 for driving the flip blocks 54 to flip upward is sleeved on the mounting rod 53, a limiting block (not shown in the figure) is provided on the mounting rod 53 to limit the maximum angle of the flip block 54 to flip upward, to ensure that the flip block 54 is inclined toward one side of the inclined guide plate 41, L-shaped blocks 57 are provided on both sides of the upper surface of the flip block 54, the winding roll 52 is formed by a plurality of winding sections that can be disconnected and connected in sequence, the winding sections pass through the L-shaped blocks 57 and extend to the end of the flip block 54, the L-shaped blocks 57 are used to guide the winding sections to prevent them from tilting.

[0039] A first adhesive area 521 is provided on the upper surface of the head end of the winding section, a second adhesive area 522 is provided on the upper surface of the tail end, a notch 523 is provided at the center of the tail end of the winding section, and a protrusion 55 corresponding to the notch 523 is fixed to the lower side of the end of the flip block 54.

[0040] When the lithium-ion battery 6 rolls down the inclined guide plate 41, the lithium-ion battery 6 will contact the winding end on the flip block 54, and the lithium-ion battery 6 will be bonded to the first adhesive area 521. Then, the weight of the lithium-ion battery 6 will cause the flip block 54 to flip downward, and the lithium-ion battery 6 will fall into the material box 42. The winding segment on the winding roll 52 will be pulled apart due to the gravity of the lithium-ion battery 6 until the protrusion 55 is inserted into the notch 523. Due to the obstruction of the protrusion 55, resistance is given to the next winding segment, causing the connection between the two adjacent winding segments to break. Then, as the lithium-ion battery 6 rolls, the winding segment will be wound around the outside of the lithium-ion battery 6, and the second adhesive area 522 will bond to the lithium-ion battery 6, thus completing the winding of the winding segment around the lithium-ion battery 6.

[0041] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A lithium-ion battery internal resistance detection tool, characterized in that: include: A material tray (2), the material tray (2) being used to place multiple rows of lithium-ion batteries (6), the material tray (2) comprising multiple linearly distributed transverse blocks (22), multiple bottom plates (23) being rotatably mounted on the transverse blocks (22) via a rotating shaft, the bottom plates (23) being used to place the lithium-ion batteries (6), a support plate (24) being fixed to the end of the bottom plate (23) close to one side of the transverse block (22), a spring (25) being provided between the support plate (24) and the transverse block (22) for supporting the weight of the lithium-ion batteries (6); A detection mechanism (1), the detection mechanism (1) being installed at the execution end of the external mechanical arm, the detection mechanism (1) being used to grasp and displace the material tray (2) and to detect the internal resistance of the lithium-ion battery (6) on the material tray (2) when it is powered on; A selection mechanism (3), the selection mechanism (3) being located at the lower side of the horizontal block (22), the selection mechanism (3) being used to support and position the material tray (2) and to select the lithium-ion batteries (6) with unqualified internal resistance on the material tray (2) so that they fall off, the selection mechanism (3) comprising an electric slide member arranged at the lower side of the horizontal block (22) and an electric push rod (36) installed at the moving end of the electric slide member, a rubber head (37) being fixed at the telescopic end of the electric push rod (36), and the electric slide member being used to drive the rubber head (37) to move; A material receiving mechanism, the material receiving mechanism being arranged at the lower side of the electric slide member of the selection mechanism (3) and being used for receiving dropped defective lithium-ion batteries (6); When the detection mechanism (1) detects a lithium-ion battery (6) whose internal resistance does not meet the standard, the electric slide member drives the rubber head (37) to move to the lower side of the support plate (24) corresponding to the lithium-ion battery (6), and the output end of the electric push rod (36) extends to push the bottom plate (23) to tilt, so that the lithium-ion battery (6) slides onto the material receiving mechanism, thereby realizing automatic selection of the lithium-ion battery (6) whose internal resistance does not meet the standard.

2. The lithium-ion battery internal resistance detection tool as claimed in claim 1, characterized in that: A fixing piece is provided on the transverse block (22), and when the bottom plate (23) turns downward along the rotation axis, the fixing piece delays locking of the support plate (24) to ensure that the lithium-ion battery (6) falls smoothly; The fixing member comprises a vertical rod (271) connected to a support plate (24) via a connecting rope (275); a fixing through hole is provided on the horizontal block (22); a rubber ring (272) is provided at the upper half of the fixing through hole; the upper end of the vertical rod (271) extends to the lower half of the fixing through hole; the inner diameter of the rubber ring (272) is smaller than the diameter of the vertical rod (271); a translation block (273) is slidably provided on the upper side of the horizontal block (22); a first groove (274) corresponding to the fixing through hole is provided on the lower side of the translation block (273); and a first inclined surface is provided at the top of the first groove (274) along the length direction of the translation block (273).

3. The lithium-ion battery internal resistance detection tool as claimed in claim 2, characterized in that: The detection mechanism (1) comprises a mounting plate, two movable racks (11) and a driving member for driving the two movable racks (11) to move are slidably arranged on the lower side of the mounting plate, the two movable racks (11) each having a plurality of rows of vertical plates (12), the vertical plates (12) having elastic terminals (14), the corresponding elastic terminals (14) on the two movable racks (11) being respectively located on both sides of the corresponding lithium-ion battery (6), the elastic terminals (14) being used for electrically contacting the electrodes of the lithium-ion battery (6), and the elastic terminals (14) being connected to an external internal resistance detector to achieve internal resistance detection.

4. The lithium-ion battery internal resistance detection tool as claimed in claim 3, characterized in that: A clamping block (13) is fixed on the vertical plate (12), a second groove (110) is provided on the side of the translation block (273), the second groove (110) has a second inclined surface, and the second inclined surface is arranged opposite to the first inclined surface.

5. The internal resistance detection tool for lithium-ion batteries according to claim 3, characterized in that: The driving member comprises a first motor (15) fixed on a mounting plate, a gear (16) being fixed to an output end of the first motor (15), racks (17) being fixed to the two moving frames (11), and the two racks (17) being meshingly connected to the gear (16).

6. The lithium-ion battery internal resistance detection tool as claimed in claim 1, characterized in that: The selection mechanism (3) further comprises a bottom frame (31), the electric slide member comprises an optical axis (38) fixed to the bottom frame (31) and a screw rod (34) rotatably mounted on the bottom frame (31), a second motor (33) for driving the screw rod (34) to rotate is fixed to the outside of the bottom frame (31), a moving rod (35) is threadedly connected to the screw rod (34), and the moving rod (35) is slidably connected to the optical axis (38); The electric push rod (36) is mounted on the moving rod (35), and the number of the electric push rods (36) is the same as the number of rows of lithium-ion batteries (6), and the moving tracks of the multiple electric push rods (36) correspond to the multiple rows of support plates (24).

7. The lithium-ion battery internal resistance detection tool as claimed in claim 6, characterized in that: The material tray (2) further comprises an outer frame (21), a plurality of the transverse blocks (22) are evenly fixed to the inner wall of the outer frame (21), at least two first positioning pins (28) are fixed to the upper side of the outer frame (21), and positioning holes corresponding to the first positioning pins (28) are opened on the lower side of the outer frame (21), and second positioning pins (32) corresponding to the positioning holes are fixed to the upper side of the bottom frame (31).

8. The lithium-ion battery internal resistance detection tool as claimed in claim 1, characterized in that: The material receiving mechanism comprises an inclined guide plate (41) arranged at the lower side of the selection mechanism (3), and a material box (42) is arranged on one side of the lower end of the inclined guide plate (41).

9. The lithium-ion battery internal resistance detection tool as claimed in claim 8, characterized in that: A winding mechanism (5) is provided at the lower end of the inclined guide plate (41) for adhering an identification ring to the periphery of a lithium-ion battery (6) with poor internal resistance. The winding mechanism (5) comprises a mounting transverse plate (51) and a mounting rod (53) fixed to the inclined guide plate (41) by a bracket. A plurality of winding rolls (52) are mounted on the mounting transverse plate (51) by means of a mounting support. A plurality of flipping blocks (54) are rotatably mounted on the mounting rod (53), and the plurality of winding rolls (52) correspond to the plurality of flipping blocks (54) respectively. A torsion spring (56) for driving the flipping blocks (54) to flip upward is sleeved on the mounting rod (53). L-shaped stoppers (57) are provided on both sides of the upper surface of the flipping block (54). The winding roll (52) is formed by a plurality of winding segments that can be disconnected and butted in sequence. The winding segments pass through the L-shaped stoppers (57) and extend to the end of the flipping block (54).

10. The lithium-ion battery internal resistance detection tool as claimed in claim 9, characterized in that: A first adhesive zone (521) is provided on the upper surface of the head end of the winding section, a second adhesive zone (522) is provided on the upper surface of the tail end, and a notch (523) is provided at the center of the tail end of the winding section, and a protrusion (55) corresponding to the notch (523) is fixed to the lower side of the end of the flip block (54).

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