A lithium-ion battery internal resistance detection tooling

Abstract

The present invention discloses a detection tool for the internal resistance of a lithium-ion battery, which relates to the technical field of lithium-ion battery production. It includes a material tray for placing multiple rows of lithium-ion batteries. The material tray comprises a plurality of horizontal blocks distributed linearly. A plurality of bottom plates are rotatably installed on the horizontal blocks through rotating shafts, and the bottom plates are used for placing lithium-ion batteries. A support plate is fixed at the end of the bottom plate near 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 is installed at the execution end of an external robotic arm. The present invention can detect the internal resistance of lithium-ion batteries in large quantities. Through an 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 this tooling can achieve a fast and accurate testing process, further optimizing the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion battery production, and particularly to a tool for detecting the internal resistance of a lithium-ion battery. Background Art

[0002] When current passes through the inside of a lithium-ion battery, it encounters resistance, which causes the working voltage of the lithium-ion battery to decrease. 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 electromotive force and open-circuit voltage. During charging, the terminal voltage is higher than the electromotive force open-circuit voltage. The internal resistance of a lithium-ion battery is not a constant; it varies 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 a lithium-ion battery affects its working voltage, working current, output energy, and power, etc. The smaller the internal resistance of a lithium-ion battery, the better. To ensure the consistency of lithium-ion battery specifications, it is necessary to detect the internal resistance of lithium-ion batteries.

[0003] The currently common method is to directly contact the two probes of a voltage internal resistance meter with the positive and negative electrodes of the lithium-ion battery to be detected and observe the reading of the voltage internal resistance meter. For detecting a large number of products, this operation method is very cumbersome, the detection speed is slowed down, and it is not conducive to mass production. Summary of the Invention

[0004] The purpose of the present invention is to provide a tool for detecting the internal resistance of a lithium-ion battery, which solves the problem of low efficiency in detecting the internal resistance of current lithium-ion batteries.

[0005] The present invention solves the above technical problems through the following technical solutions. The present invention includes:

[0006] A tray for placing multiple rows of lithium-ion batteries. The tray includes a plurality of cross blocks linearly distributed. A plurality of bottom plates are rotatably installed on the cross blocks through rotating shafts. The bottom plates are used for placing lithium-ion batteries. A support plate is fixed at the end of the bottom plate close to the cross block side. A spring for supporting the weight of the lithium-ion battery is provided between the support plate and the cross block;

[0007] A detection mechanism installed at the execution end of an external robotic arm, which is used for grasping and displacing the tray and for energizing and detecting the internal resistance of the lithium-ion batteries on the tray;

[0008] A selection mechanism located below the cross block, which is used for supporting and positioning the tray and for picking out the lithium-ion batteries with unqualified internal resistance on the tray to make them fall. The selection mechanism includes an electric slide table member arranged below the cross block and an electric push rod installed on the moving end of the electric slide table member. A rubber head is fixed at the telescopic end of the electric push rod, and the electric slide table member is used to drive the rubber head to move;

[0009] A material receiving mechanism is provided below the electric slide member of the selection mechanism for receiving the dropped defective lithium-ion batteries.

[0010] When the detection mechanism detects a lithium-ion battery with an internal resistance not meeting the standard, the electric slide member 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 be tilted, so that the lithium-ion battery slides onto the material receiving mechanism, realizing the automatic selection of lithium-ion batteries with an internal resistance not meeting the standard.

[0011] Preferably, a fixing member is provided on the cross block. When the bottom plate rotates downward along the rotating shaft, the fixing member delays the locking of the support plate to ensure the smooth dropping of the lithium-ion battery.

[0012] The fixing member includes a vertical rod connected to the support plate by a connecting rope. A fixing through hole is provided on the cross block. The upper half of the fixing through hole is provided with a rubber ring. 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 cross 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 at the top of the first groove along the length direction of the translation block.

[0013] Preferably, the detection mechanism includes a mounting plate. Two moving frames and a driving member for driving the two moving frames to move are slidably provided on the lower side of the mounting plate. Each of the two moving frames has multiple rows of vertical plates. Elastic terminals are provided on the vertical plates. The corresponding elastic terminals on the two moving frames are respectively located on both sides of the corresponding lithium-ion battery. The elastic terminals are used for electrical contact with the electrodes of the lithium-ion battery, and the elastic terminals are connected to an external internal resistance detector to realize the detection of the internal resistance.

[0014] Preferably, a clamping block is fixed on the vertical plate. A second groove is provided on the side of the translation block. The second groove has a second inclined surface, and the second inclined surface is oppositely arranged to the first inclined surface.

[0015] 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. Rack bars are fixed on both of the two moving frames. Both of the two rack bars are meshed with the gear.

[0016] Preferably, the selection mechanism further includes a bottom frame. The electric slide member includes an optical axis fixed to the bottom frame and a lead screw rotatably installed in the bottom frame. A second motor for driving the lead screw to rotate is fixed on the outside of the bottom frame. A moving rod is threadedly connected to the lead screw, and the moving rod is slidably connected to the optical axis.

[0017] The electric push rod is installed on the moving rod, and the number of the electric push rods is the same as the number of rows of the lithium-ion batteries, and the moving tracks of the plurality of electric push rods respectively correspond to the plurality of rows of support plates.

[0018] Preferably, the material tray further includes an outer frame, a plurality of the horizontal blocks are uniformly fixed on the inner wall of the outer frame, at least two first positioning pins are fixed on the upper side of the outer frame, and positioning holes corresponding to the first positioning pins are formed in the lower side of the outer frame, and a second positioning pin corresponding to the positioning hole is fixed on the upper side of the bottom frame.

[0019] Preferably, the material receiving mechanism includes an inclined guide plate arranged below the sorting mechanism, and a material box is arranged on one side of the lower end of the inclined guide plate.

[0020] Preferably, a winding mechanism is arranged at the lower end of the inclined guide plate, which is used to stick a marking ring around the lithium-ion battery with poor internal resistance. The winding mechanism includes a mounting cross plate and a mounting rod fixed on the inclined guide plate through a bracket. A plurality of winding reels are mounted on the mounting cross plate through mounting seats, a plurality of turning blocks are rotatably mounted on the mounting rod, and the plurality of winding reels and the plurality of turning blocks respectively correspond to each other. A torsion spring for driving the turning block to turn upwards is sleeved on the mounting rod. L-shaped stoppers are arranged on both sides of the upper surface of the turning block. The winding reel is formed by sequentially and detachably docking a plurality of winding segments. The winding segment passes through the L-shaped stopper and extends to the end part of the turning block.

[0021] Preferably, a first adhesive area is arranged on the upper surface of the head end of the winding segment, a second adhesive area is arranged on the upper surface of the tail end thereof, and a notch is formed in the central part of the tail end of the winding segment. A protrusion corresponding to the notch is fixed on the lower side of the end part of the turning block.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The present invention can mass-produce and detect the internal resistance of lithium-ion batteries. Through an 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 achieve a fast and accurate testing process, further optimizing the production efficiency;

[0024] The present invention is equipped with automatically screening and collecting the lithium-ion batteries with unqualified internal resistance, which not only improves the efficiency of quality control, but also reduces the error of manual screening;

[0025] The present invention can wind a winding segment for marking and buffering on the outer side of the picked 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. Description of the Drawings

[0026] Figure 1Schematic three-dimensional structure diagram of the present invention;

[0027] Figure 2 is Figure 1 Schematic three-dimensional structure diagram of the detection mechanism in;

[0028] Figure 3 is Figure 1 Schematic three-dimensional structure diagram of the tray in;

[0029] Figure 4 is Figure 3 Schematic cross-sectional structure diagram of a part from the first perspective;

[0030] Figure 5 is Figure 3 Schematic cross-sectional structure diagram of a part from the second perspective;

[0031] Figure 6 Schematic top-down cross-sectional structure diagram of the second groove;

[0032] Figure 7 is Figure 1 Schematic three-dimensional structure diagram of the selection mechanism in;

[0033] Figure 8 is Figure 1 Schematic cross-sectional structure diagram of the inclined guide plate, the material box and the winding mechanism in;

[0034] Figure 9 is Figure 1 Schematic three-dimensional structure diagram of the winding mechanism in.

[0035] The numbers in the figure indicate:

[0036] 1 - Detection mechanism; 11 - Moving frame; 12 - Vertical plate; 13 - Clamping block; 14 - Elastic terminal; 15 - First motor; 16 - Gear; 17 - Rack; 18 - Chute; 19 - Slide block; 110 - Second groove;

[0037] 2 - Tray; 21 - Outer frame; 22 - Horizontal 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;

[0038] 3 - Selection mechanism; 31 - Bottom frame; 32 - Second positioning pin; 33 - Second motor; 34 - Lead screw; 35 - Moving rod; 36 - Electric push rod; 37 - Rubber head; 38 - Optical axis;

[0039] 41 - Inclined guide plate; 42 - Material box;

[0040] 5 - Winding mechanism; 51 - Installation cross - plate; 52 - Winding roll; 521 - First adhesive area; 522 - Second adhesive area; 523 - Notch; 53 - Installation rod; 54 - Flipping block; 55 - Protrusion; 56 - Torsion spring; 57 - L - shaped stop block;

[0041] 6 - Lithium - ion battery. Specific implementation mode

[0042] The following combines the accompanying drawings to make a more detailed description of the above - mentioned and other technical features and advantages of the present invention.

[0043] This embodiment provides a technical solution: a lithium - ion battery internal resistance detection tooling, as Figures 1 to 9 shown, including a material tray 2, a detection mechanism 1, a selection mechanism 3, a winding mechanism 5, and a material receiving mechanism.

[0044] The material tray 2 is used to place multiple rows of lithium - ion batteries 6. The material tray 2 includes an outer frame 21. Inside the outer frame 21, there are multiple horizontally arranged cross - blocks 22. On the multiple cross - blocks 22, a bottom plate 23 is rotatably installed through a rotating shaft. The bottom plate 23 is a plate with an arc - shaped structure. The bottom plate 23 is the part for placing the lithium - ion battery 6, and both sides of it have raised isolation parts. The isolation parts are fixed to the cross - blocks 22, and one isolation part and the corresponding cross - block 22 together form a storage station 26. At the end of the bottom plate 23 near the cross - block 22, a support plate 24 is fixed. Between the support plate 24 and the cross - block 22, there is a spring 25 for supporting the weight of the lithium - ion battery 6.

[0045] When placing the lithium - ion battery 6 inside 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 position the lithium - ion battery 6, two limiting blocks 261 can be fixed on the inner side of the isolation part. 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.

[0046] On the cross - block 22, there is a fixing part. When the bottom plate 23 rotates downward along the rotating shaft, the support plate 24 will tilt upward. At this time, the fixing part 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 drops smoothly, so as to pick out the lithium - ion battery 6 with poor internal resistance and achieve the effect of automatically picking out the lithium - ion battery 6 with poor quality.

[0047] The fixing member includes a vertical rod 271 connected to the support plate 24 through a connecting rope 275. The arrangement of the connecting rope 275 enables the vertical rod 271 and the support plate 24 to always maintain a soft connection state. A fixing through-hole is provided on the transverse block 22. The upper half of the fixing through-hole is provided with a rubber ring 272. 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 acting 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 slidably arranged on the upper side of the transverse block 22, and the translation block 273 slides along the length direction of the transverse block 22. The two can be slidably connected through a T-shaped sliding structure to prevent them from falling off. A first groove 274 corresponding to the fixing through-hole is provided on the lower side of the translation block 273. The top of the first groove 274 is provided with a first inclined surface along the length direction of the translation block 273.

[0048] When it is detected that there is a lithium-ion battery 6 with unqualified internal resistance, the corresponding support plate 24 can be pushed upward through the selection mechanism 3, so that the vertical rod 271 moves upward. 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 push the translation block 273 to move. 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 to realize the picking out of the lithium-ion battery 6 with unqualified internal resistance. Since the lithium-ion battery 6 has been discharged, the acting force borne by the bottom plate 23 will decrease, and the clamping force of the rubber ring 272 on the vertical rod 271 cannot resist the downward acting force of the spring 25 on the support plate 24, so that the support plate 24 and the bottom plate 23 gradually turn back to the original position.

[0049] The detection mechanism 1 is used to perform grasping displacement on the tray 2 and perform power-on detection of the internal resistance of the lithium-ion batteries 6 on the tray 2; it should be noted that: the detection mechanism 1 is installed at the execution end of an external truss or robotic arm to realize movement, and then perform grasping displacement on the tray 2.

[0050] The detection mechanism 1 includes a mounting plate. Two moving frames 11 are slidably arranged on the lower side of the mounting plate, and a driving member for driving the two moving frames 11 to move. A chute 18 is formed on the moving frame 11, and a slider 19 is slidably arranged in the chute 18, and the slider 19 is fixed to the mounting plate. The moving directions of the two moving frames 11 are close to each other or away from each other. Both of the two moving frames 11 have multiple rows of vertical plates 12, and elastic terminals 14 are provided on the vertical plates 12. The corresponding elastic terminals 14 on the two moving frames 11 are respectively located on both sides of the corresponding lithium-ion battery 6. The elastic terminals 14 are used for making electrical contact with the electrodes of the lithium-ion battery 6, and the elastic terminals 14 are connected to an external internal resistance detector to realize the detection of the internal resistance.

[0051] The driving member includes a first motor 15 fixed to the mounting plate. A gear 16 is fixed to the output end of the first motor 15. Rack bars 17 are fixed to both of the two moving frames 11, and both of the two rack bars 17 are meshed and connected with the gear 16. The two rack bars 17 are symmetrically arranged.

[0052] When detecting the lithium-ion battery 6, by operating the first motor 15 to drive the gear 16 to rotate, and with the cooperation of the two rack bars 17, the two moving frames 11 are made to approach each other, so that the corresponding elastic terminals 14 are in contact with the electrodes of the corresponding lithium-ion battery 6, and then the detection of the internal resistance can be carried out.

[0053] A clamping block 13 is fixed to the vertical plate 12. The clamping block 13 is located on the side far from the elastic terminal 14. A second groove 110 is formed in the side part of the translation block 273. The second groove 110 has a second inclined surface, and the second inclined surface is oppositely arranged with the first inclined surface.

[0054] When the detection mechanism 1 clamps the tray 2, by driving the driving member to drive the clamping block 13 to move towards one side of the translation block 273, the clamping block 13 will enter the second groove 110. Since the vertical rod 271 will displace the translation block 273 when moving upward, when the detection mechanism 1 clamps the tray 2, the clamping block 13 will contact the second inclined surface, and then the translation block 273 can be displaced, so that the translation block 273 returns to the original position, and then the vertical rod 271 that has not fallen can be displaced downward by the first inclined surface, avoiding the remaining vertical rod 271 still being in the first groove 274.

[0055] The selection mechanism 3 is used for supporting and positioning the tray 2 and picking out the lithium-ion batteries 6 with unqualified internal resistance on the tray 2 to make them fall; the selection mechanism 3 includes a bottom frame 31. In order to avoid interference between the fallen lithium-ion batteries 6 and the edge of the bottom frame 31, a support frame is provided at the central position on the upper side of the bottom frame 31 for erecting the tray 2.

[0056] 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.

[0057] 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 .

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 reels 52 are mounted on the mounting cross plate 51 through mounting supports. A plurality of flipping blocks 54 are rotatably mounted on the mounting rod 53, and the plurality of winding reels 52 and the plurality of flipping blocks 54 correspond to each other respectively. A torsion spring 56 for driving the flipping block 54 to flip upward is sleeved on the mounting rod 53. A limiting block (not shown in the figure) for limiting the maximum angle of the flipping block 54 to flip upward is provided on the mounting rod 53 to ensure that the flipping block 54 is inclined toward the inclined guide plate 41. L-shaped stoppers 57 are provided on both sides of the upper surface of the flipping block 54. The winding reel 52 is formed by sequentially disconnectable docking of multiple winding segments. The winding segment passes through the L-shaped stopper 57 and extends to the end portion of the flipping block 54. The L-shaped stopper 57 is used to guide the winding segment to prevent it from skewing.

[0063] A first adhesive area 521 is provided on the upper surface of the head end of the winding segment, a second adhesive area 522 is provided on the upper surface of its tail end, and a notch 523 is formed in the central portion of the tail end of the winding segment. A protrusion 55 corresponding to the notch 523 is fixed to the lower side of the end of the flipping block 54.

[0064] 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 flipping block 54, and the lithium-ion battery 6 will be bonded to the first adhesive area 521. Subsequently, the weight of the lithium-ion battery 6 will cause the flipping block 54 to flip downward, and the lithium-ion battery 6 will fall into the material box 42. The winding segments on the winding reel 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 blockage of the protrusion 55, resistance is given to the next winding segment, causing the connection between adjacent two winding segments to break. Subsequently, as the lithium-ion battery 6 rolls, the winding segment will wind around the outside of the lithium-ion battery 6, and the second adhesive area 522 will be bonded to the lithium-ion battery 6, that is, the winding segment is wound around the lithium-ion battery 6.

[0065] The above is only a preferred embodiment of the present invention, which is illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope 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 fixing piece being provided on the transverse block (22), and when the bottom plate (23) is turned downward along the rotating shaft, the fixing piece delays the locking of the support plate (24) to ensure that the lithium-ion batteries (6) are held in the storage tank. The battery (6) falls smoothly; the fixing member comprises a vertical rod (271) connected to the 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); the top of the first groove (274) has a first inclined surface provided along the length direction of the translation block (273); A detection mechanism (1), the detection mechanism (1) being mounted on the execution end of an external robot 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, the detection mechanism (1) comprising a mounting plate, two movable racks (11) and a driving member for driving the two movable racks (11) to move being slidably disposed on the lower side of the mounting plate, the two movable racks (11) both having a plurality of rows of vertical plates (12); 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; 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; When the material tray (2) is clamped by the detection mechanism (1), the clamping block (13) is driven by the driving member to move toward one side of the translation block (273), and the clamping block (13) will enter the second groove (110). Since the vertical rod (271) will push 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) will be pushed and 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 by the first inclined surface to move downward, so as to prevent the vertical rod (271) from being left in the first groove (274).

2. The lithium-ion battery internal resistance detection tool as claimed in claim 1, characterized in that: The vertical plate (12) is provided with an elastic terminal (14), and the corresponding elastic terminals (14) on the two mobile frames (11) are respectively located on both sides of the corresponding lithium-ion battery (6), and the elastic terminals (14) are used to electrically contact the electrodes of the lithium-ion battery (6), and the elastic terminals (14) are connected to an external internal resistance detector to achieve internal resistance detection.

3. The lithium-ion battery internal resistance detection tool as claimed in claim 1, 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).

4. 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).

5. The lithium-ion battery internal resistance detection tool as claimed in claim 4, 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).

6. 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).

7. The lithium-ion battery internal resistance detection tool as claimed in claim 6, 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).

8. The lithium-ion battery internal resistance detection tool as claimed in claim 7, 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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