Lithium battery ocv test mechanism with ng replacement function

Abstract

This invention discloses a lithium battery OCV testing mechanism with NG replacement function, including a support component, one or more positive electrode probe components, one or more negative electrode probe components, and an NG replacement gripper assembly. In use, the support component is mounted on a robot. The positive electrode probe components, negative electrode probe components, and NG replacement gripper assembly are all mounted on the support component. In use, the positive electrode probe components and negative electrode probe components contact the positive and negative electrodes of the battery cell, respectively, for OCV testing of the battery cell. The NG replacement gripper assembly is used to replace the NG battery cell that has undergone OCV testing. This invention sets the NG replacement of the battery cell within the battery cell's OCV testing mechanism, eliminating the need for a separate NG replacement mechanism. This invention reduces the space utilization of the lithium battery production line, solves the problem of lengthy layouts in lithium battery production equipment, and makes the lithium battery production line more compact. This invention also effectively reduces the production cost of lithium batteries.

Description

Technical Field

[0001] This utility model relates to a lithium battery OCV testing mechanism with NG replacement function, belonging to the field of lithium battery production lines. Background Technology

[0002] As the core power source for new energy vehicles, lithium batteries' open-circuit voltage (OCV) directly reflects their health status. Abnormal voltage (such as overcharging / over-discharging) can lead to thermal runaway risks (accounting for 68% of battery safety incidents). Meanwhile, voltage consistency (within-pack deviation ≤5mV) is a crucial prerequisite for balanced battery pack performance. Therefore, conducting OCV testing on batteries before they are manufactured into a PACK is essential.

[0003] Existing OCV testing and NG replacement equipment, such as that disclosed in Chinese utility model patent CN222805628U, adopts a separate design, where OCV testing is completed at station 1 and NG replacement is performed at station 2. The disadvantages of this existing technology are its lengthy equipment layout, low production line space utilization, inability to meet the needs of compact production lines, and relatively high costs, thus increasing the production cost of lithium batteries. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium battery OCV testing mechanism with NG replacement function, which solves the technical defects in the prior art where OCV testing and NG replacement of battery cells are performed by different equipment, resulting in a long layout of lithium battery production equipment, low utilization of production line space, and inability to meet the needs of compact production lines.

[0005] To solve the above problems, the technical solution adopted by this utility model is: a lithium battery OCV testing mechanism with NG replacement function, including a support component, one or more positive electrode probe components, one or more negative electrode probe components, and an NG replacement gripper component. The support component is installed on a robot in the use state. The positive electrode probe component, the negative electrode probe component, and the NG replacement gripper component are all installed on the support component. In the use state, the positive electrode probe component and the negative electrode probe component are in contact with the positive and negative electrodes of the battery cell, respectively, for OCV testing of the battery cell. The NG replacement gripper component is used to replace the NG battery cell that has been tested by OCV in the use state.

[0006] As a further improvement of this utility model, the NG replacement gripper assembly includes a lifting cylinder, a gripper cylinder, and clamping fingers. The lifting cylinder is mounted on the support assembly. The gripper cylinder is connected to the lifting cylinder and is driven to move vertically by the lifting cylinder. There are two clamping fingers, which are driven by the gripper cylinder to move closer to each other or further away from each other. The two clamping fingers move closer to each other to clamp NG cells or qualified cells, and the two clamping fingers move further away from each other to release NG cells or qualified cells.

[0007] As a further improvement of this utility model, the NG replacement gripper assembly also includes a pneumatic gripper connector. The gripper cylinder is installed at the bottom of the pneumatic gripper connector. There are two lifting cylinders, both of which are installed on the support assembly. The two ends of the pneumatic gripper connector are respectively connected to the two lifting cylinders. The two lifting cylinders move synchronously to drive the pneumatic gripper connector to move vertically.

[0008] As a further improvement of this utility model, the NG replacement gripper assembly also includes two gripper mounting plates, which are connected to gripper cylinders and driven by the gripper cylinders to move closer or further apart from each other. Two gripping fingers are respectively mounted on the two gripper mounting plates, and their positions on the gripper mounting plates are adjustable.

[0009] As a further improvement of this utility model, the NG replacement gripper assembly also includes two anti-collision pads, which are respectively disposed on the opposite ends of the bottom of the two gripper mounting plates.

[0010] As a further improvement of this utility model, the positive electrode probe assembly includes a probe mounting block A, a positive electrode probe, and a temperature measuring element A. The probe mounting block A is mounted on a support assembly and its position on the support assembly is adjustable. The positive electrode probe and the temperature measuring element A are both mounted on the probe mounting block A and are used to contact the positive electrode post of the lithium battery and detect the temperature of the battery cell, respectively, during use.

[0011] As a further improvement of this utility model, the positive electrode probe assembly also includes an overvoltage protection structure, which includes an anti-collision pressure head, a guide rod, a compression spring, a sensing head, and a proximity switch. The guide rod passes through the probe mounting block A and can move up and down relative to the probe mounting block A. The anti-collision pressure head is fixed at the bottom end of the guide rod. The compression spring is sleeved on the guide rod, with its upper and lower ends respectively abutting against the probe mounting block A and the anti-collision pressure head. The sensing head is set at the top end of the guide rod, and the proximity switch is set on the probe mounting block A. In the use state, the anti-collision pressure head abuts against the battery cell. When the sensing head moves into the sensing range of the proximity switch, the robot stops moving the support assembly downward.

[0012] As a further improvement of this utility model, the negative electrode probe assembly includes a probe mounting block B, a negative electrode probe, and a temperature measuring element B. The probe mounting block B is mounted on a support assembly and its position on the support assembly is adjustable. The negative electrode probe and the temperature measuring element B are both mounted on the probe mounting block B and are used to contact the terminal post of the negative electrode of the lithium battery and to detect the temperature of the battery cell, respectively, during use.

[0013] As a further improvement of this utility model, the negative electrode probe assembly also includes a barcode scanner for scanning the QR code on the battery cell, and the NG replacement gripper assembly is also used to replace the NG battery cell that fails to scan the QR code during use.

[0014] As a further improvement of this utility model, the support assembly includes a mounting plate, a distance adjustment device, and two side plates. A robot flange is provided on the top of the mounting plate for mounting on the robot. The two side plates are slidably mounted on the mounting plate. The distance adjustment device is used to adjust the distance between the two side plates. The NG replacement gripper assembly is mounted on the lower surface of the mounting plate and located between the two side plates. The positive electrode probe assembly and the negative electrode probe assembly are mounted on the side plates and their positions can be adjusted along the length of the side plates.

[0015] As a further improvement of this utility model, a side mounting plate is provided on the top of the side plate, and a transition block is provided at each end of the side mounting plate. The transition block is composed of a horizontal transition unit and a vertical transition unit. The vertical transition unit is fixedly connected to the end of the side mounting plate, and the horizontal transition unit is slidably mounted on the upper surface of the mounting plate using a guide rail and a slider.

[0016] As a further improvement of this utility model, the distance adjustment device includes a lead screw and a handwheel. The two ends of the lead screw pass through two side mounting plates respectively and are threadedly engaged with the side mounting plates. The threads at both ends of the lead screw rotate in opposite directions. At least two clamping plates are provided on the mounting plates. The lead screw passes through the clamping plates and is rotatably connected to the clamping plates. The handwheel is provided at one end of the lead screw. The lead screw is driven to rotate by the handwheel to drive the two side mounting plates to move closer or further apart synchronously.

[0017] As a further improvement of this utility model, an installation groove is provided along the length direction on the side plate, and the positive electrode probe assembly and the negative electrode probe assembly are installed in the installation groove. A scale A is provided on the side plate above and / or below the installation groove to determine the adjustment position of the positive electrode probe assembly and the negative electrode probe assembly on the side plate.

[0018] In summary, the beneficial effects of this utility model are as follows: 1. This utility model sets the NG replacement of the battery cell on the OCV testing mechanism of the battery cell, so that there is no need to set up a separate NG replacement mechanism. Compared with the prior art, this utility model reduces the space utilization of the lithium battery production line, solves the problem of the long layout of lithium battery production equipment, and makes the battery production line more compact. This utility model also effectively reduces the production cost of lithium batteries.

[0019] 2. This utility model uses a lifting cylinder to drive the gripper cylinder to lift and lower, and the gripper cylinder drives the gripping fingers to move, so as to clamp or release the battery cell. When the battery cell fails the test, the NG battery cell is replaced.

[0020] 3. This utility model is equipped with a pneumatic gripper connector, with a lifting cylinder connected to each end. The two lifting cylinders move synchronously to drive the gripper cylinder to rise and fall, making the lifting and falling of the gripper cylinder more stable.

[0021] 4. By setting a clamping claw mounting plate, this utility model can increase the distance between the two clamping fingers, making it applicable to the replacement of more specifications of battery cells.

[0022] 5. The present invention is equipped with anti-collision pads, which can effectively prevent damage to the battery cells caused by the collision between the clamp mounting plate and the battery cells when replacing NG battery cells.

[0023] 6. This utility model sets a positive electrode probe and a temperature measuring element A on the control pin mounting block A, which cooperate with the positive electrode of the battery cell to perform OCV testing on the battery cell and measure the temperature of the battery cell to determine whether the battery cell is qualified.

[0024] 7. This utility model is equipped with a circular overvoltage protection structure. When the positive probe of this utility model is engaged with the positive terminal of the battery cell, this utility model moves downward. When the proximity switch senses the most sensitive head, this utility model stops moving downward to avoid damage to the battery cell terminal.

[0025] 8. This utility model sets a negative electrode probe and a temperature measuring element B on the probe mounting block B, which cooperate with the negative electrode of the battery cell to perform OCV testing on the battery cell and measure the temperature of the battery cell in order to determine whether the battery cell is qualified.

[0026] 9. This utility model is equipped with a barcode scanner to scan the QR code on the battery cell. By scanning the QR code on the battery cell, it can further determine whether the battery cell is qualified and replace the NG battery cell that fails the barcode scan.

[0027] 10. This utility model uses a distance adjustment device to drive the distance between the side plate and the mounting plate, making it applicable to the testing of more specifications of battery cells and improving its versatility.

[0028] 11. By setting a transition block, this utility model allows the side plate located below the mounting plate to slide and connect with the mounting plate on the upper surface of the mounting plate, thereby improving the stability of the side plate adjustment in this utility model.

[0029] 12. This utility model uses the different threads at both ends of the lead screw to make the side plates on both sides move in opposite directions when the lead screw rotates, so that the two side plates can move closer or further away at the same time.

[0030] 13. This utility model facilitates the installation and position adjustment of the positive electrode probe assembly and the negative electrode probe assembly by opening an installation groove on the side plate. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the new practical theory.

[0032] Figure 2 This is a three-dimensional structural diagram of the support component in this utility model.

[0033] Figure 3 This is a front view of the positive electrode probe assembly in this utility model.

[0034] Figure 4 This is a three-dimensional structural diagram of the positive electrode probe assembly in this utility model.

[0035] Figure 5 This is a three-dimensional structural diagram of the negative electrode probe assembly in this utility model.

[0036] Figure 6 This is a three-dimensional structural diagram of the NG replacement gripper assembly in this utility model.

[0037] The components include: 1. Support assembly; 2. Positive probe assembly; 3. Negative probe assembly; 4. NG replacement gripper assembly; 5. Lifting cylinder; 6. Gripper cylinder; 7. Gripper finger; 8. Gripper connector; 9. Gripper mounting plate; 10. Anti-collision pad; 11. Probe mounting block A; 12. Positive probe; 13. Temperature sensing element A; 14. Anti-collision pressure head; 15. Guide rod; 16. Compression spring; 17. Sensor head; 18. Proximity switch; 19. Probe mounting block B; 20. Negative probe; 21. Temperature sensing element B; 22. Barcode scanner; 23. Mounting plate; 24. Side plate; 25. Robot flange; 26. Side mounting plate; 27. Adapter block; 28. Horizontal adapter unit; 29. ​​Vertical adapter unit; 30. 31. Lead screw; 32. Handwheel; 33. Clamping plate fixing block; 34. Mounting slot; 35. Scale A; 36. Connecting beam; 37. Connecting plate; 38. Slotted photoelectric bracket A; 39. Slotted photoelectric A; 40. Photosensitive film A; 41. Slotted photoelectric bracket B; 42. Photoelectric sensor; 43. Adjusting block A; 44. Thermometer bracket; 45. Linear bearing; 46. Locking nut; 47. Buffer pad; 48. Adjusting block B; 49. Guide rail; 50. Slider; 51. Adjusting slider; 52. Locking block; 53. Guide rod; 54. Lead screw; 55. Handle; 56. Pointer; 57. Scale B; 58. 3M anti-stick adhesive; 59. Anti-stick adhesive clamping block; 60. Through-beam photoelectric. Detailed Implementation

[0038] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0039] like Figures 1 to 6The lithium battery OCV testing mechanism with NG replacement function shown includes a support component 1, one or more positive electrode probe components 2, one or more negative electrode probe components 3, and an NG replacement gripper component 4. Since each cell of the lithium battery has a positive electrode post and a negative electrode post, the number of positive electrode posts and negative electrode posts in the entire lithium battery is equal. Therefore, the number of positive electrode probe components 2 and negative electrode probe components 3 in this utility model is equal, and they are the same as the number of cells in each lithium battery. The support component 1 is mounted on a four-axis robot (not shown in the figure) in the use state. The positive electrode probe components 2, negative electrode probe components 3, and NG replacement gripper component 4 are all mounted on the support component 1. In the use state, the positive electrode probe components 2 and negative electrode probe components 3 are in contact with the positive and negative electrodes of the cell, respectively, for OCV detection of the cell. The NG replacement gripper component 4 is used to replace the NG cell that has been OCV detected in the use state.

[0040] like Figure 6 As shown, the NG replacement gripper assembly 4 of this utility model includes a lifting cylinder 5, a gripper cylinder 6, and gripping fingers 7. The cylinder body of the lifting cylinder 5 is mounted on the support assembly 1. The gripper cylinder 6 is connected to the lifting cylinder 5 and is driven by the lifting cylinder 5 to move vertically. There are two gripping fingers 7, which are driven by the gripper cylinder 6 to move closer or further apart. When the OCV test result of the positive electrode probe assembly 2 and / or the negative electrode probe assembly 3 is unqualified, the corresponding battery cell is an NG battery cell. At this time, the lifting cylinder 5 drives the gripper cylinder 6 to move downward, and the gripper cylinder 6 then drives the two gripping fingers 7 to move closer and clamp the NG battery cell. Then, the robot drives this utility model to transfer the NG battery cell to the designated position. The gripper cylinder 6 then drives the two gripping fingers 7 to move further apart and release the NG battery cell. The robot then drives this utility model to the place where a qualified battery cell is placed, where the gripping fingers 7 clamp the qualified battery cell. Then, the robot drives this utility model to the aforementioned place where the NG battery cell was removed, and places the qualified battery cell there, thus realizing the replacement of the NG battery cell.

[0041] like Figure 6As shown, the NG replacement gripper assembly 4 of this utility model also includes a pneumatic gripper connector 8. The pneumatic gripper connector 8 consists of a connecting beam 35 and two connecting plates 36. The two connecting plates 36 are bolted to both ends of the connecting beam 35, making the entire pneumatic gripper connector 8 H-shaped. A pneumatic gripper mounting seat 36 is detachably bolted to the bottom of the connecting beam 35. A gripper cylinder 6 is mounted on the pneumatic gripper mounting seat 36. There are two lifting cylinders 5, both of which are slide cylinders. The cylinder bodies of the two slide cylinders are mounted on the support assembly 1, and the slides of the two slide cylinders are arranged facing each other. The connecting plates 36 at both ends of the pneumatic gripper connector 8 are detachably bolted to the slides of the two lifting cylinders 5. The slides of the two lifting cylinders 5 move synchronously, driving the pneumatic gripper connector 8 to move vertically as a whole. The gripper cylinders 6 mounted on the connecting beam 35 via the pneumatic gripper mounting seat 36 move vertically accordingly, so that the gripping fingers 7 move closer to or further away from the battery cell.

[0042] like Figure 6 As shown, in order to increase the range of battery cell specifications that the clamping fingers 7 can grasp, the NG replacement gripper assembly 4 of this utility model also includes two gripper mounting plates 9. The gripper mounting plates 9 are rectangular plates, and one end of the two gripper mounting plates 9 are respectively mounted on the two grippers of the gripper cylinder 6. The movement of the grippers of the gripper cylinder 6 drives them to move closer or further apart. The two clamping fingers 7 are respectively mounted on the two gripper mounting plates 9, and their positions on the gripper mounting plates 9 are adjustable. This utility model has two rows of connecting through holes on the gripper mounting plates 9. Nuts with threaded engagement at the top of the clamping fingers 7 are provided in the connecting through holes. The clamping fingers 7 are detachably mounted on the gripper mounting plates 9. By setting the nuts of the connecting gripper mounting plates 9 and the clamping fingers 7 in different connecting through holes, the position of the clamping fingers 7 on the gripper mounting plates 9 can be adjusted.

[0043] like Figure 6 As shown, the NG replacement gripper assembly 4 also includes two anti-collision pads 10, which are respectively disposed on the opposite ends of the bottom of the two gripper mounting plates 9. In use, the lifting cylinder 5 drives the gripper cylinder 6 to move downward, and the anti-collision pads 10 press against the battery cell, effectively preventing damage to the battery cell. The anti-collision pads 10 in this invention are rectangular blocks made of rubber. This invention has 3M anti-adhesive 58 on the opposite side of the two clamping fingers 7, and anti-adhesive pressing blocks 59 on both sides of the 3M anti-adhesive 58 are used to press them firmly onto the clamping fingers 7. A photoelectric sensor 60 is provided on the side of the clamping fingers 7 away from the 3M anti-adhesive 58 to detect whether there is a battery cell below the NG replacement gripper assembly 4.

[0044] like Figure 6As shown, this invention features a slotted photoelectric bracket A37 detachably mounted on the cylinder body of the gripper cylinder 6 using two bolts. A slotted photoelectric bracket A38 is mounted at each end of the slotted photoelectric bracket A37. A photosensitive film A39 is positioned on the gripper mounting plate 9 near the anti-collision pad 10. The photosensitive film A39 moves synchronously with the gripper mounting plate 9. If there is a battery cell between the two gripping fingers 7, the photosensitive film A39 does not pass through the slotted photoelectric bracket A38 during the process of the two gripping fingers 7 moving towards each other with the gripper mounting plate 9 to clamp the battery cell. However, when there is no battery cell between the two gripping fingers 7, the photosensitive film A39 will pass through the slotted photoelectric bracket A38 during the process of the two gripping fingers 7 moving towards each other with the gripper mounting plate 9, thus determining whether there is a battery cell between the two gripping fingers 7. This invention also features a slotted photoelectric bracket on the side of the lifting cylinder 5 away from the slide table. The electric bracket B40 has two slotted photoelectric sensors B41 installed on it. A photoelectric sensor 42 is installed on the side of the lifting cylinder 5 where the slotted photoelectric sensor B41 is located. The bottom end of the photoelectric sensor 42 is bent at 90 degrees towards the slide table and is fixedly connected to the slide table of the lifting cylinder 5, so that the entire photoelectric sensor 42 can move up and down with the slide table. A sensing protrusion is provided on the top of the side of the photoelectric sensor 42 facing the slotted photoelectric sensor B41. The sensing protrusion moves synchronously with the movement of the photoelectric sensor 42. When it moves upward into the upper slotted photoelectric sensor B41, the slide table of the lifting cylinder 5 stops moving upward. When the sensing protrusion moves downward into the lower slotted photoelectric sensor B41, the slide table of the lifting cylinder 5 stops moving downward. The movement of the slide table of the lifting cylinder 5 is controlled by the two slotted photoelectric sensors B41.

[0045] like Figure 3 and Figure 4 As shown, the positive electrode probe assembly 2 includes a probe mounting block A11, a positive electrode probe 12, and a temperature measuring element A13. The probe mounting block A11 is mounted on the support assembly 1 and its position on the support assembly 1 is adjustable. In this invention, an adjusting block A43 is detachably mounted on the probe mounting block A11 using bolts. The adjusting block A43 is rectangular and plate-shaped. The probe mounting block A11 is located at the bottom end of the adjusting block A43, and the top end of the adjusting block A43 is mounted on the support assembly 1 and its position on the support assembly 1 can be adjusted. The positive electrode probe 12 and the temperature measuring element A13 are both mounted on the probe mounting block A11 and are used to contact the positive electrode post of the lithium battery and detect the temperature of the battery cell, respectively, during use. In this invention, the positive electrode probe 12 is directly mounted on the probe mounting block A11. A temperature measuring instrument bracket 44 is mounted on the probe mounting block A11, and the temperature measuring element A13 is mounted on the temperature measuring instrument bracket 44.

[0046] like Figure 3 and Figure 4As shown, the positive probe assembly 2 in this utility model is equipped with an overvoltage protection structure. This overvoltage protection structure includes an anti-collision head 14, a guide rod 15, a compression spring 16, a sensing head 17, and a proximity switch 18. The guide rod 15 passes through the probe mounting block A11 and can move up and down relative to the probe mounting block A11. A linear bearing 45 is mounted on the probe mounting block A11, and the guide rod 14 passes through the linear bearing 45. The anti-collision head 14 is fixed to the bottom end of the guide rod 15, and a locking nut 46 is fixed to the anti-collision head 14. The locking nut 46 is threadedly engaged with the bottom end of the guide rod 15, allowing the anti-collision head 14 to be detachably mounted on the guide rod 15. At the bottom of the guide rod 15, a compression spring 16 is sleeved on the guide rod 15, with its upper and lower ends abutting against the probe mounting block A11 and the anti-collision pressure head 14, respectively. The sensing head 17 is set at the top of the guide rod 15, and a buffer pad 47 made of rubber is set at the bottom of the sensing head 17. The proximity switch 18 is set on the probe mounting block A11. In this utility model, the proximity switch 18 is fixed on the adjusting block A43 of the probe mounting block A11. In the use state, the anti-collision pressure head 14 abuts against the battery cell. When the sensing head 17 moves into the sensing range of the proximity switch 18, the robot stops moving the support assembly 1 downward to avoid the electrode being damaged by excessive pressure.

[0047] like Figure 5 As shown, the negative electrode probe assembly 3 of this utility model includes a probe mounting block B19, a negative electrode probe 20, and a temperature measuring element B21. The probe mounting block B19 is mounted on the support assembly 1 and its position on the support assembly 1 is adjustable. The utility model is preferably provided with a rectangular plate-shaped adjusting block B48. The probe mounting block B19 is detachably mounted on the bottom end of the adjusting block B48 by bolts. The top end of the adjusting block B48 is mounted on the support assembly 1 and its position can be adjusted on the support assembly 1. The negative electrode probe 20 and the temperature measuring element B21 are both mounted on the probe mounting block B19 and are used to contact the negative electrode post of the lithium battery and detect the temperature of the cell, respectively, during use.

[0048] like Figure 5 As shown, the negative electrode probe assembly 3 in this utility model is also equipped with a barcode scanner 22. The barcode scanner 22 is used to scan the QR code on the battery cell. The NG replacement gripper assembly 4 is also used to replace the NG battery cell that fails to scan the QR code when in use. In this utility model, when the barcode scanner 22 fails to scan the battery cell, it may be because the battery cell itself is unqualified or the barcode scanner 22 is faulty. Under the premise that the battery cell OCV test is qualified, if the battery cell fails to scan the code, the battery cell will be replaced regardless of whether the battery cell is unqualified or the barcode scanner 22 is faulty. However, if the battery cell fails the OCV test, the unqualified battery cell will be replaced regardless of whether the scan is successful.

[0049] like Figure 2As shown, the support component 1 of this utility model includes a mounting plate 23, a distance adjustment device, and two side plates 24. The mounting plate 23 is a rectangular plate, and a robot flange 25 is provided on the upper surface of the mounting plate 23. The robot flange 25 is used to install on the robot. The two side plates 24 are slidably mounted on the mounting plate 23. The two side plates 24 can slide towards each other or away from each other, thereby adjusting the distance between the two side plates 24 to accommodate different specifications of battery cells. The distance adjustment device is used to adjust the distance between the two side plates 24. The NG replacement gripper assembly 4 is mounted on the lower surface of the mounting plate 23 and located between the two side plates 24. The positive electrode probe assembly 2 and the negative electrode probe assembly 3 are mounted on the side plates 24 and can be adjusted along the length of the side plates 24. The mounting positions of the positive electrode probe assembly 2 and the negative electrode probe assembly 3 on the side plates 24 in this utility model are determined by the distribution of the positive and negative electrodes of the battery cells that make up the lithium battery. The cylinder body of the lifting cylinder 5 in this utility model is mounted on the lower surface of the mounting plate 23.

[0050] like Figure 2 As shown, to facilitate the relative sliding of the side plate 23 and the mounting plate 23, this invention provides a side mounting plate 26 on the top of the side plate 24. The length of the side mounting plate 26 is less than the length of the side plate 23. A transition block 27 is provided at each end of the side mounting plate 26. The transition block 27 consists of a horizontal transition unit 28 and a vertical transition unit 29. The top end of the vertical transition unit 29 is detachably bolted to one end of the horizontal transition unit 28. The vertical transition unit 29 is detachably bolted to the end of the side mounting plate 26. The horizontal transition unit 28 is slidably mounted on the upper surface of the mounting plate 23 using guide rails and sliders. This invention provides two guide rails 49 on the upper surface of the mounting plate 23. A slider 50 is mounted on the lower surface of the horizontal transition unit 28 away from the vertical transition unit 29. The slider 50 slides in cooperation with the guide rails 49.

[0051] like Figure 2 As shown, the distance adjustment device of this utility model includes a lead screw 30 and a handwheel 31. The two ends of the lead screw 30 pass through two side mounting plates 26 respectively and are threadedly engaged with the side mounting plates 26. The threads at the two ends of the lead screw 30 rotate in opposite directions. At least two clamping blocks 32 are provided on the mounting plate 23. The lead screw 30 passes through the clamping blocks 32 and is rotatably connected to the clamping blocks 32 by bearings. The handwheel 31 is provided at one end of the lead screw 30. The lead screw 30 is driven to rotate by the handwheel 31 to drive the two side mounting plates 26 to move closer or further away from each other synchronously. For example, when the lead screw 30 rotates in the forward direction, the two side mounting plates 26 move closer to each other synchronously, and when the lead screw 30 rotates in the reverse direction, the two side mounting plates 26 move further away from each other synchronously.

[0052] like Figure 2As shown, this utility model has a mounting groove 33 along the length direction on the side plate 24. There are multiple mounting grooves 33 in this utility model. Each mounting groove 33 is used to install a positive electrode probe assembly 2 or a negative electrode probe assembly 3. The positive electrode probe assembly 2 and the negative electrode probe assembly 3 are installed in the mounting groove 33. A scale A34 is provided on the side plate 24 above and / or below the mounting groove 33 to determine the adjustment position of the positive electrode probe assembly 2 and the negative electrode probe assembly 3 on the side plate 24. In this utility model, each mounting groove 33 corresponds to a scale A34, and the scale A34 is located below the mounting groove 33.

[0053] like Figures 3 to 5 As shown, this utility model has an adjustment structure at the top of both the adjustment block A43 and the adjustment block B48. This adjustment structure includes an adjustment slider 51, a locking block 52, two guide rods 53, a lead screw 54, and a handle 55. The adjustment slider 51 is detachably mounted on the adjustment block A43 or the adjustment block B48 using bolts. The locking block 52 is fixedly connected to the two guide rods 53. Two guide holes corresponding to the guide rods 53 are provided on the adjustment slider 51. The two guide rods 53 are disposed in the guide holes and can move within them. The lead screw 54 passes through both the adjustment slider 51 and the adjustment block A43 or the adjustment slider 51 and the adjustment block B48, and is rotatably connected to the adjustment slider 51 using a bearing. The other end of the lead screw 54 passes through the locking block 52. Furthermore, a handle 53 is threadedly engaged with the locking block 52 and located on the end of the lead screw 54 away from the adjusting slider 51, for rotating the lead screw 54 during use. In this invention, both the lead screw 54 and the guide rod 53 pass through the mounting groove 33. The adjusting slider 51 and the locking block 52 are located on opposite sides of the mounting groove 33. Rotating the lead screw 54 adjusts the distance between the locking block 52 and the adjusting slider 51, clamping the side plate 24 to fix the positive probe assembly 2 and the negative probe assembly 3. Loosening the locking block 52 and the adjusting slider 51 allows the positive probe assembly 2 and the negative probe assembly 3 to move along the length of the mounting groove 33, adjusting their positions. This invention includes a pointer 56 on either the adjusting block A43 or the adjusting block B48. This pointer 56, in conjunction with the scale A34, determines the distance the positive probe assembly 2 and the negative probe assembly 3 are adjusted on the side plate 24.

[0054] like Figure 2 As shown, the present invention has scales B57 installed at both ends of the mounting plate 23, wherein scales B57 are perpendicular to scales A34, and scales B57 can determine the distance that the side plate 24 moves on the mounting plate 23.

[0055] In this invention, after the tray holding the battery cells reaches the working position, the four-axis robot moves the invention so that the positive probe assembly 2 and the negative probe assembly 3 are directly above the battery cell's terminal post. The robot then lowers the invention so that the positive probe 12 and the negative probe 20 contact the positive and negative terminals of the battery cell, respectively. While testing the OCV, a barcode scanner scans the QR code on the battery cell. After the test is completed, the robot moves the invention upward and waits for the MES to provide test data. If there are no NG (not good) battery cells, the tray is moved away. If there are NG battery cells, the tray is unlocked (existing technology), the battery cell is released, the NG replacement gripper assembly 4 removes the NG battery cell, and replaces it with an OK (qualified) battery cell. The tray is then locked (existing technology), and the OK battery cell is retested. After the retest is completed, if there are no NG battery cells, the tray is moved away.

[0056] Unless otherwise specified in the above description, all parts are existing technology or can be implemented using existing technology. Furthermore, the specific embodiments described in this utility model are merely preferred embodiments of the invention and are not intended to limit the scope of this utility model. That is, all equivalent changes and modifications made within the scope of this utility model patent should be considered within the technical scope of this utility model.

Claims

1. A lithium battery OCV testing mechanism with NG replacement function, characterized in that, The device includes a support assembly, one or more positive probe assemblies, one or more negative probe assemblies, and an NG replacement gripper assembly. The support assembly is mounted on the robot in use. The positive probe assembly, negative probe assembly, and NG replacement gripper assembly are all mounted on the support assembly. In use, the positive probe assembly and negative probe assembly are in contact with the positive and negative electrodes of the battery cell, respectively, for OCV testing of the battery cell. The NG replacement gripper assembly is used to replace the NG battery cell that has undergone OCV testing in use.

2. The lithium battery OCV testing mechanism with NG replacement function according to claim 1, characterized in that, The NG replacement gripper assembly includes a lifting cylinder, a gripper cylinder, and clamping fingers. The lifting cylinder is mounted on a support assembly. The gripper cylinder is connected to the lifting cylinder and is driven to move vertically by the lifting cylinder. There are two clamping fingers, which are driven by the gripper cylinder to move closer to or further away from each other. When the two clamping fingers move closer to each other, they are used to clamp NG or qualified battery cells. When the two clamping fingers move further away from each other, they are used to release NG or qualified battery cells.

3. The lithium battery OCV testing mechanism with NG replacement function according to claim 2, characterized in that, The NG replacement gripper assembly also includes a gripper connector. The gripper cylinder is installed at the bottom of the gripper connector. There are two lifting cylinders, both of which are installed on the support assembly. The two ends of the gripper connector are connected to the two lifting cylinders respectively. The two lifting cylinders move synchronously to drive the gripper connector to move vertically.

4. The lithium battery OCV testing mechanism with NG replacement function according to claim 3, characterized in that, The NG replacement gripper assembly also includes two gripper mounting plates and two anti-collision pads. The two gripper mounting plates are connected to gripper cylinders and are driven by the gripper cylinders to move closer or further apart. Two gripping fingers are respectively mounted on the two gripper mounting plates and their positions on the gripper mounting plates are adjustable. The two anti-collision pads are respectively set on the opposite ends of the bottom of the two gripper mounting plates.

5. The lithium battery OCV testing mechanism with NG replacement function according to claim 1, characterized in that, The positive electrode probe assembly includes a probe mounting block A, a positive electrode probe, a temperature sensing element A, and an overvoltage protection structure. The probe mounting block A is mounted on the support assembly and its position on the support assembly is adjustable. Both the positive electrode probe and the temperature sensing element A are mounted on the probe mounting block A and are used to contact the positive electrode post of the lithium battery and detect the temperature of the cell, respectively, during use. The overvoltage protection structure includes an anti-collision pressure head, a guide rod, a compression spring, a sensing head, and a proximity switch. The guide rod passes through the probe mounting block A and can move up and down relative to the probe mounting block A. The anti-collision pressure head is fixed to the bottom end of the guide rod. The compression spring is sleeved on the guide rod, with its upper and lower ends abutting against the probe mounting block A and the anti-collision pressure head, respectively. The sensing head is located at the top end of the guide rod, and the proximity switch is located on the probe mounting block A. During use, the anti-collision pressure head rests against the cell. When the sensing head moves into the sensing range of the proximity switch, the robot stops moving the support assembly downwards.

6. The lithium battery OCV testing mechanism with NG replacement function according to claim 1, characterized in that, The negative electrode probe assembly includes a probe mounting block B, a negative electrode probe, a temperature sensing element B, and a barcode scanner. The probe mounting block B is mounted on a support assembly and its position on the support assembly is adjustable. The negative electrode probe and the temperature sensing element B are both mounted on the probe mounting block B and are used to contact the negative electrode post of the lithium battery and detect the temperature of the cell, respectively, during use. The barcode scanner is mounted on the probe mounting block B and is used to scan the QR code on the cell. The NG replacement gripper assembly is also used to replace NG cells that fail to scan the QR code during use.

7. The lithium battery OCV testing mechanism with NG replacement function according to claim 1, characterized in that, The support assembly includes a mounting plate, a distance adjustment device, and two side plates. A robot flange is provided on the top of the mounting plate for mounting onto the robot. The two side plates are slidably mounted on the mounting plate. The distance adjustment device is used to adjust the distance between the two side plates. An NG replacement gripper assembly is mounted on the lower surface of the mounting plate and located between the two side plates. The positive electrode probe assembly and the negative electrode probe assembly are mounted on the side plates and their positions can be adjusted along the length of the side plates. 8.The lithium battery OCV test mechanism with NG replacement function according to claim 7, characterized in that, A side mounting plate is provided on the top of the side plate. A transition block is provided at each end of the side mounting plate. The transition block consists of a horizontal transition unit and a vertical transition unit. The vertical transition unit is fixedly connected to the end of the side mounting plate, and the horizontal transition unit is slidably installed on the upper surface of the mounting plate using a guide rail and a slider.

9. The lithium battery OCV testing mechanism with NG replacement function according to claim 8, characterized in that, The distance adjustment device includes a lead screw and a handwheel. The two ends of the lead screw pass through two side mounting plates and are threaded into the side mounting plates. The threads at the two ends of the lead screw turn in opposite directions. At least two clamping blocks are provided on the mounting plates. The lead screw passes through the clamping blocks and is rotatably connected to the clamping blocks. The handwheel is located at one end of the lead screw. The lead screw is driven to rotate by the handwheel to drive the two side mounting plates to move closer or further apart synchronously.

10. The lithium battery OCV testing mechanism with NG replacement function according to claim 7, characterized in that, A mounting groove is provided along the length of the side plate. The positive electrode probe assembly and the negative electrode probe assembly are installed in the mounting groove. A scale A is provided on the side plate above and / or below the mounting groove to determine the adjustment position of the positive electrode probe assembly and the negative electrode probe assembly on the side plate.

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