A testing device and method for square battery module

Abstract

The application discloses a kind of square battery module testing device and testing method of battery module technical field, including outer frame, the bottom fixed connection of outer frame has base, the top fixed connection of outer frame has hydraulic rod, the output end of hydraulic rod is provided with puncture rod, the side fixed connection of outer frame has control cabinet, the inside of outer frame is provided with neutralization cleaning component, the puncture experiment of battery is carried out simultaneously with the cleaning after puncture of puncture rod by using neutralization cleaning component, it is not necessary to clean separately after puncture is completed, then puncture experiment is used, so as to effectively improve the efficiency of puncture experiment, and by rotating the mode of puncture rod and rubbing cylinder contact, the impurities attached to the surface of puncture rod can be cleaned, the chemical battery liquid attached to the surface of puncture rod due to battery module puncture is washed clean, avoid subsequent puncture experiment when battery liquid on the surface of puncture rod causes influence on puncture experiment.

Description

Technical Field

[0001] This invention relates to the field of battery module technology, specifically to a testing device and testing method for square battery modules. Background Technology

[0002] Square battery modules are battery modules assembled into a square shape using multiple lithium batteries. They are mostly used in electric bicycles and electric vehicles. According to the outer casing material, they are divided into: aluminum-cased lithium batteries, steel-cased lithium-ion batteries, and soft-pack lithium batteries. According to the positive electrode material, they are mainly divided into: lithium cobalt oxide, nickel cobalt manganese, nickel cobalt aluminum, lithium iron phosphate, lithium iron phosphate, lithium manganese oxide, and lithium polymer batteries.

[0003] After battery modules are manufactured, they need to undergo various tests to ensure battery quality, including destructive puncture tests. These tests obtain data on the battery's compression and explosion resistance by puncturing the battery module, determining how much pressure the battery can withstand without exploding in a collision. Current puncture tests typically involve inserting a puncture rod into the battery through compression. After the test, the puncture rod is removed, and the test is repeated. However, because the battery contains chemical components that easily adhere to the surface of the puncture rod, failure to clean the surface can affect the accuracy of subsequent puncture tests. Furthermore, the chemical components adhering to the surface of the puncture rod can easily corrode it. Cleaning the puncture rod after each test also reduces the efficiency of the puncture test.

[0004] Based on this, the present invention designs a testing device and testing method for square battery modules to solve the problem that the surface of the puncture rod will be affected by chemical components due to puncturing the battery during the puncture test. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device and testing method for square battery modules to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing device for a square battery module, comprising an outer frame, a base fixedly connected to the bottom of the outer frame, a hydraulic rod fixedly connected to the top of the outer frame, a puncture rod provided at the output end of the hydraulic rod, a control console fixedly connected to one side of the outer frame, and a neutralization and cleaning component provided inside the outer frame, the neutralization and cleaning component being used to clean away the chemical components on the puncture rod after puncturing the battery.

[0007] As a further embodiment of the present invention, the neutralization and cleaning assembly includes a connecting plate disposed inside an outer frame. A piercing rod is fixedly connected to each of the bottom two sides of the connecting plate, and a docking rail is fixedly connected to each of the top two sides of the connecting plate. A docking block for rotatably connecting with the docking rail is fixedly connected to the bottom output shaft of the hydraulic rod. A telescopic rod is fixedly connected to the top of the connecting plate. A sleeve is fixedly connected inside the top of the outer frame. The output shaft of the telescopic rod is rotatably connected to the sleeve. A rotating motor is fixedly connected to the top of the outer frame. The output shaft of the rotating motor passes through the outer frame and is fixedly connected to the output shaft of the telescopic rod inside the sleeve. A soaking cylinder is fixedly connected to the bottom of the outer frame. A friction cylinder for docking with the piercing rod is disposed inside the soaking cylinder.

[0008] As a further embodiment of the present invention, a fixed gear is fixedly connected to the top of the puncture rod, a sliding plate is fixedly connected to the side wall of the outer frame, a lead screw is slidably connected inside the sliding plate, a connecting rod is helically sleeved at one end of the lead screw, a first rack is slidably connected to the outside of the connecting rod, a return spring for resetting the first rack is fixedly connected to one end of the connecting rod, a second rack is fixedly connected to the side wall of the sliding plate, a connecting gear for meshing with the second rack is fixedly connected to the lead screw, and transmission sleeves are fixedly connected to both sides of the connecting plate.

[0009] As a further embodiment of the present invention, a fixing plate is fixedly connected to the top of the soaking tube, and a pushing cylinder is fixedly connected to both sides of the fixing plate. A fixing shaft is fixedly connected to the top of the fixing plate, and a clamping sleeve is slidably connected to the fixing shaft. The output end of the pushing cylinder is fixedly connected to the clamping sleeve.

[0010] As a further embodiment of the present invention, a highly absorbent foam block is fixedly connected to the inner wall of the clamping sleeve.

[0011] As a further embodiment of the present invention, a fire extinguisher is fixedly connected to the side wall of the outer frame, and nozzles are fixedly connected to the front and rear ends of the outer frame respectively, with the input ends of the two nozzles respectively connected to the fire extinguisher.

[0012] As a further embodiment of the present invention, a fixed gear is slidably connected to the slide plate, and a docking ring for slidably connecting with the fixed gear is provided on the first rack rod.

[0013] A testing method for a square battery module, the method comprising the following steps: Step 1: Place the square battery module to be punctured on the base stably; Step 2: Drive the puncture rod downwards using the hydraulic rod to perform a puncture test on the battery module, and observe the corresponding experimental data through the control console; Step 3: After the puncture is completed, the puncture rod is cleaned with a neutralization and cleaning component to remove the chemical components that adhered to the surface after puncturing the battery; Step 4: Replace with a new battery module and repeat the puncture test.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a neutralization and cleaning component, allowing the battery puncture test and post-puncture cleaning of the puncture rod to be performed simultaneously. This eliminates the need for separate cleaning of the puncture rod after puncture, effectively improving the efficiency of the puncture test. Furthermore, by rotating the puncture rod to contact the friction cylinder, impurities adhering to the surface of the puncture rod are thoroughly cleaned, and the chemical battery fluid adhering to the surface due to puncturing the battery module is rinsed away. This prevents the battery fluid on the puncture rod surface from affecting subsequent puncture tests and also avoids corrosion caused by prolonged adhesion of battery fluid to the puncture rod, effectively extending its service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the front structure of the present invention; Figure 3 A schematic diagram of the telescopic rod, connecting plate, and puncture rod structure; Figure 4 A schematic diagram of the first rack rod, lead screw, connecting gear, and second rack rod; Figure 5 This is a schematic diagram of a partial cross-sectional structure of the first rack rod; Figure 6 This is a schematic diagram of the soaking tank structure; Figure 7 This is a flowchart of the method of the present invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Control console; 2. Rotary motor; 3. Outer frame; 4. Fire extinguisher; 5. Nozzle; 6. Base; 7. Hydraulic rod; 8. Sleeve; 9. Telescopic rod; 10. Connecting plate; 11. Puncture rod; 12. Soaking cylinder; 13. Connecting block; 14. Connecting rail; 15. First rack rod; 16. Transmission sleeve; 17. Fixed gear; 18. Connecting gear; 19. Second rack rod; 20. Slide plate; 21. Return spring; 22. Connecting rod; 23. Lead screw; 24. Fixing plate; 25. Foam block; 26. Clamping sleeve; 27. Fixed shaft; 28. Push cylinder; 29. ​​Friction cylinder; 30. Limiting rod. Detailed Implementation

[0017] Please see Figure 1-7The present invention provides a technical solution: a testing device for a square battery module, including an outer frame 3, a base 6 fixedly connected to the bottom of the outer frame 3, a hydraulic rod 7 fixedly connected to the top of the outer frame 3, a puncture rod 11 provided at the output end of the hydraulic rod 7, a control console 1 fixedly connected to one side of the outer frame 3, and a neutralization and cleaning component provided inside the outer frame 3, the neutralization and cleaning component being used to clean away the chemical components on the puncture rod 11 after puncturing the battery; When the above solution is put into practical use, during the puncture test, the square battery module to be punctured is placed stably on the base 6. The puncture rod 11 is driven downward by the hydraulic rod 7 to puncture the battery module. The corresponding experimental data is observed through the control console 1. After the puncture is completed, the puncture rod 11 is cleaned by the neutralization and cleaning component to remove the chemical components adhering to the surface after puncturing the battery. Then, the puncture test can continue to be performed on the battery module. The advantage of this is that the puncture rod 11 can be cleaned after each puncture test, rinsing off the chemical battery fluid adhering to the surface of the puncture rod 11 after puncturing the battery module. This avoids the battery fluid on the surface of the puncture rod 11 affecting the puncture test in subsequent puncture tests. It also avoids corrosion caused by the long-term adhesion of battery fluid to the puncture rod 11, effectively improving the service life of the puncture rod 11.

[0018] As a further embodiment of the present invention, the neutralization and cleaning assembly includes a connecting plate 10, which is disposed inside the outer frame 3. A piercing rod 11 is fixedly connected to both sides of the bottom of the connecting plate 10, and a docking rail rod 14 is fixedly connected to both sides of the top of the connecting plate 10. A docking block 13 for rotatably connecting with the docking rail rod 14 is fixedly connected to the bottom output shaft of the hydraulic rod 7. A telescopic rod 9 is fixedly connected to the top of the connecting plate 10. A sleeve 8 is fixedly connected inside the top of the outer frame 3. The output shaft of the telescopic rod 9 is rotatably connected to the sleeve 8. A rotating motor 2 is fixedly connected to the top of the outer frame 3. The output shaft of the rotating motor 2 passes through the outer frame 3 and is fixedly connected to the output shaft of the telescopic rod 9 inside the sleeve 8. A soaking cylinder 12 is fixedly connected to the bottom of the outer frame 3. A friction cylinder 29 for docking with the piercing rod 11 is disposed inside the soaking cylinder 12. A fixed gear 17 is fixedly connected to the top of the piercing rod 11. The outer frame 3... A sliding plate 20 is fixedly connected to the side wall. A lead screw 23 is slidably connected inside the sliding plate 20. A connecting rod 22 is screwed onto one end of the lead screw 23. A first rack rod 15 is slidably connected to the outside of the connecting rod 22. A return spring 21 for resetting the first rack rod 15 is fixedly connected to one end of the connecting rod 22. A second rack rod 19 is fixedly connected to the side wall of the sliding plate 20. A connecting gear 18 for meshing with the second rack rod 19 is fixedly connected to the lead screw 23. Transmission sleeves 16 are fixedly connected to both sides of the connecting plate 10. A fixing plate 24 is fixedly connected to the top of the soaking cylinder 12. Push cylinders 28 are fixedly connected to both sides of the fixing plate 24. A fixing shaft 27 is fixedly connected to the top of the fixing plate 24. A clamping sleeve 26 is slidably connected to the fixing shaft 27. The output end of the push cylinder 28 is fixedly connected to the clamping sleeve 26. A highly absorbent foam block 25 is fixedly connected to the inner wall of the clamping sleeve 26. When the above scheme is put into practical use, during the puncture test, the hydraulic rod 7 is activated to push the connecting plate 10 down, causing the telescopic rod 9 to be stretched. The puncture rod 11 at the top of the base 6 directly punctures the battery for the test. After the test, the hydraulic rod 7 drives the puncture rod 11 to reset. Then, the rotating motor 2 is activated to drive the telescopic rod 9 to rotate. The telescopic rod 9 drives the connecting plate 10 to rotate, causing the connecting plate 10 to rotate 180 degrees and exchange the positions of the two puncture rods 11 at the bottom. The rotation position is determined by the rotational docking of the docking rail rod 14 and the docking block 13. During the rotation, the first rack rod 15 will contact the inclined wall on the transmission sleeve 16. Then, along the inclined wall of the transmission sleeve 16, the first rack rod 15 is squeezed and slides along the connecting rod 22, stretching the reset spring 21. As the connecting plate 10 rotates, when the first rack rod 15 enters the transmission sleeve 16, it is pulled back to its original position by the elastic force of the return spring 21, causing the first rack rod 15 to slide to the position where it meshes with the fixed gear 17. Then, the battery to be pierced is placed back on the base 6. When piercing is performed again, a new piercing rod 11 is used to pierce the battery, while the previously used piercing rod 11 slides downward as the hydraulic rod 7 is pressed down. Since the first rack rod 15 is located at the bottom of the connecting plate 10, when the connecting plate 10 slides downward, it will drive the first rack rod 15 to slide downward as well. The first rack rod 15 drives the lead screw 23 to slide down, causing the connecting gear 18 at one end of the lead screw 23 to mesh with the second rack rod 19. When the connecting gear 18 rotates, it drives the lead screw 23 to rotate, causing the connecting rod 22, which is threaded to the lead screw 23, to compress the return spring 21. When the return spring 21 can no longer be compressed, the connecting rod 22 will drive the first rack rod 15 to slide together. The sliding first rack rod 15 will then drive the fixed gear 17 to rotate, which in turn drives the puncture rod 11 to rotate together. The rotating puncture rod 11 extends into the soaking tank 12 and reacts with the acid-base neutralization solution inside the soaking tank 12. The chemical battery liquid adhering to the surface of the puncture rod 11 is precipitated through the chemical reaction and detached from the surface of the puncture rod 11 by contacting the friction tank 29. The rotating puncture rod 11 can fully contact the side wall of the friction tank 29 until the impurities adhering to its surface are completely cleaned. After the puncture test, the hydraulic rod 7 drives the connecting plate 10 to reset. As the connecting plate 10 slides upward, it pushes the cylinder 28 to drive the clamping sleeve 26 to slide inward into the soaking cylinder 12. This allows the two foam blocks 25 to clamp the puncture rod 11 from both sides. The foam blocks 25 contact the surface of the puncture rod 11 to clean the water from its surface and further remove any remaining impurities. After the connecting plate 10 resets, the motor 2 rotates the connecting plate 10 again to swap the positions of the two puncture rods 11. This allows the treated puncture rods 11 to be used again for puncture tests on the battery. The used puncture rods 11 then enter the soaking cylinder 12 to clean the surface battery fluid. This method is beneficial for the battery puncture test.The cleaning of the puncture rod 11 after puncture is performed simultaneously, eliminating the need for separate cleaning of the puncture rod 11 after puncture before use in puncture experiments. This effectively improves the efficiency of puncture experiments. Furthermore, by rotating the puncture rod 11 to contact the friction cylinder 29, impurities adhering to the surface of the puncture rod 11 can be cleaned, and then the foam block 25 absorbs the moisture adhering to the surface of the soaked puncture rod 11.

[0019] As a further embodiment of the present invention, a fire extinguisher 4 is fixedly connected to the side wall of the outer frame 3, and a nozzle 5 is fixedly connected to the front and rear ends of the outer frame 3 respectively, and the input ends of the two nozzles 5 are respectively connected to the fire extinguisher 4. When the above solution is put into practical use, during puncture tests, the battery may sometimes catch fire due to squeezing and puncturing. Extinguishing the fire with foam sprayed from fire extinguisher 4 can improve safety and prevent fires.

[0020] As a further embodiment of the present invention, a limiting rod 30 is slidably connected to the slide plate 20, and a docking ring for slidably connecting with the limiting rod 30 is provided on the first rack rod 15; When the above solution is put into practical use, the limiting rod 30 improves the overall stability of the first rack rod 15, making the first rack rod 15 more stable when the connecting plate 10 pushes the first rack rod 15 to slide up and down.

[0021] A testing method for a square battery module, the method comprising the following steps: Step 1: Place the square battery module to be tested on base 6 stably; Step 2: Drive the puncture rod 11 downwards using the hydraulic rod 7 to perform a puncture test on the battery module, and observe the corresponding experimental data through the control console 1; Step 3: After the puncture is completed, the puncture rod 11 is cleaned with the neutralization and cleaning component to remove the chemical components that adhered to the surface after puncturing the battery. Step 4: Replace with a new battery module and repeat the puncture test.

[0022] Working principle: During the puncture test, the square battery module to be punctured is placed stably on the base 6. The puncture rod 11 is driven downward by the hydraulic rod 7 to puncture the battery module. The corresponding experimental data is observed through the control console 1. The hydraulic rod 7 is activated to push the connecting plate 10 down, causing the telescopic rod 9 to be stretched. The puncture rod 11 at the top of the base 6 directly punctures the battery for the test. After the test, the hydraulic rod 7 drives the puncture rod 11 to reset. Then, the rotating motor 2 is activated to drive the telescopic rod 9 to rotate. The telescopic rod 9 drives the connecting plate 10 to rotate, causing the connecting plate 10 to rotate 180 degrees and exchange the positions of the two puncture rods 11 at the bottom. The rotation position is determined by the rotation and docking of the docking rail rod 14 and the docking block 13. During the rotation, the first rack rod 1... 5 will contact the inclined wall on the transmission sleeve 16, and then along the inclined wall of the transmission sleeve 16, the first rack rod 15 will be squeezed and slide along the connecting rod 22, stretching the return spring 21. As the connecting plate 10 rotates, when the first rack rod 15 enters the transmission sleeve 16, under the elastic force of the return spring 21, it will pull the first rack rod 15 back to its original position, causing the first rack rod 15 to slide to the position of meshing with the fixed gear 17. Then, the battery to be punctured is placed back on the base 6. At this time, when puncturing, a new puncture rod 11 is used to puncture the battery, while the previously used puncture rod 11 will slide downward as the hydraulic rod 7 is pressed down. At this time, since the first rack rod 15 is located at the bottom of the connecting plate 10, when the connecting plate 10 moves downward... When sliding, the first rack rod 15 slides downwards together. The first rack rod 15 drives the lead screw 23 to slide down, causing the connecting gear 18 at one end of the lead screw 23 to mesh and rotate with the second rack rod 19. The rotation of the connecting gear 18 drives the lead screw 23 to rotate, causing the connecting rod 22, which is threaded to the lead screw 23, to compress the return spring 21. When the return spring 21 can no longer be compressed, the connecting rod 22 will drive the first rack rod 15 to slide together. The sliding first rack rod 15 will then drive the fixed gear 17 to rotate, which in turn drives the puncture rod 11 to rotate. The rotating puncture rod 11 extends into the soaking tank 12 and reacts with the acid-base neutralization solution inside the soaking tank 12, dissolving the chemical battery solution adhering to the surface of the puncture rod 11 through a chemical reaction. A precipitate is generated and detaches from the surface of the puncture rod 11 through contact with the friction cylinder 29. The rotating puncture rod 11 can fully contact the side wall of the friction cylinder 29 until the impurities attached to its surface are completely cleaned. After the puncture experiment, the hydraulic rod 7 drives the connecting plate 10 to reset. When the connecting plate 10 slides upward, it pushes the cylinder 28 to drive the clamping sleeve 26 to slide into the soaking cylinder 12, so that the two foam blocks 25 clamp the puncture rod 11 from both sides. The foam blocks 25 contact the surface of the puncture rod 11 to clean the water on the surface of the puncture rod 11, and at the same time, it can further remove the impurities remaining on the surface of the puncture rod 11. After the connecting plate 10 is reset, the connecting plate 10 is rotated again by the rotating motor 2 so that the positions of the two puncture rods 11 are reversed.The treated puncture rod 11 is then used to perform another puncture test on the battery. After use, the puncture rod 11 is inserted into the immersion tank 12 to clean the surface battery fluid.

Claims

1. A testing device for a square battery module, comprising an outer frame (3), a base (6) fixedly connected to the bottom of the outer frame (3), a hydraulic rod (7) fixedly connected to the top of the outer frame (3), a puncture rod (11) provided at the output end of the hydraulic rod (7), a control console (1) fixedly connected to one side of the outer frame (3), and a neutralization and cleaning component provided inside the outer frame (3), the neutralization and cleaning component being used to clean away the chemical components on the puncture rod (11) after puncturing the battery; The neutralization and cleaning assembly includes a connecting plate (10), which is located inside the outer frame (3). A piercing rod (11) is fixedly connected to both sides of the bottom of the connecting plate (10). A docking rail rod (14) is fixedly connected to both sides of the top of the connecting plate (10). A docking block (13) for rotating connection with the docking rail rod (14) is fixedly connected to the bottom output shaft of the hydraulic rod (7). A telescopic rod (9) is fixedly connected to the top of the connecting plate (10). A sleeve (8) is fixedly connected inside the top of the outer frame (3). The output shaft of the telescopic rod (9) is rotatably connected to the sleeve (8). A rotating motor (2) is fixedly connected to the top of the outer frame (3). The output shaft of the rotating motor (2) passes through the outer frame (3) and is fixedly connected to the output shaft of the telescopic rod (9) inside the sleeve (8). A soaking cylinder (12) is fixedly connected to the bottom of the outer frame (3). A fixed gear (17) is fixedly connected to the top of the puncture rod (11), a sliding plate (20) is fixedly connected to the side wall of the outer frame (3), a lead screw (23) is slidably connected inside the sliding plate (20), a connecting rod (22) is screwed to one end of the lead screw (23), a first rack rod (15) is slidably connected to the outside of the connecting rod (22), and a reset spring (21) for resetting the first rack rod (15) is fixedly connected to one end of the connecting rod (22). The slide plate (20) is fixedly connected to the side wall of the second rack rod (19), and the lead screw (23) is fixedly connected to the connecting gear (18) for meshing with the second rack rod (19). The two side walls of the connecting plate (10) are respectively fixedly connected to the transmission sleeve (16). The soaking tube (12) is provided with a friction tube (29) for docking with the puncture rod (11). During the rotation of the connecting plate (10), the first rack rod (15) will contact the inclined wall on the transmission sleeve (16), and then the first rack rod (15) will be squeezed along the inclined wall of the transmission sleeve (16) and slide along the connecting rod (22) and stretch the return spring (21). As the connecting plate (10) rotates, the first rack rod (15) enters the transmission sleeve (16), and under the elastic force of the return spring (21), it will pull the first rack rod (15) back to its original position, so that the first rack rod (15) slides to the position of meshing with the fixed gear (17).

2. The testing device for a square battery module according to claim 1, characterized in that: The top of the soaking tube (12) is fixedly connected to a fixing plate (24), and a push cylinder (28) is fixedly connected to both sides of the fixing plate (24). The top of the fixing plate (24) is fixedly connected to a fixing shaft (27), and a clamping sleeve (26) is slidably connected to the fixing shaft (27). The output end of the push cylinder (28) is fixedly connected to the clamping sleeve (26).

3. The testing device for a square battery module according to claim 2, characterized in that: The inner wall of the clamping sleeve (26) is fixedly connected to a highly absorbent foam block (25).

4. The testing device for a square battery module according to claim 1, characterized in that: Fire extinguishers (4) are fixedly connected to the side wall of the outer frame (3), and nozzles (5) are fixedly connected to the front and rear ends of the outer frame (3), and the input ends of the two nozzles (5) are respectively connected to the fire extinguishers (4).

5. The testing device for a square battery module according to claim 1, characterized in that: A limiting rod (30) is slidably connected to the slide plate (20), and a docking ring for slidably connecting with the limiting rod (30) is provided on the first rack rod (15).

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