Multifunctional intelligent detection platform for lithium battery shell

Abstract

This invention discloses a multifunctional intelligent testing platform for lithium battery casings, applied in the field of lithium battery technology. It includes a first testing component, comprising an upper mounting base and a lower mounting base. Limiting rods are installed at the lower corners of the upper mounting base, and a limiting seat is installed at the upper end of the lower mounting base. Several hydraulic push rods are installed at the lower end of the upper mounting base, with a pressure plate fixedly connected to the output end of each hydraulic push rod. Several hydraulic push rods are installed at the upper end of the lower mounting base, with a pressure block fixedly connected to the output end of each hydraulic push rod. Several limiting sliders are provided at the upper end of the lower mounting base. A barometric pressure detector and several optical detectors are fixedly installed at the upper end of the lower mounting base. Several test chambers are installed around the periphery of the lower mounting base, and electrical testing equipment is installed inside each test chamber. This invention enables the accurate testing of the casing's performance.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, specifically to a multifunctional intelligent testing platform for lithium battery casings. Background Technology

[0002] A lithium battery is a type of rechargeable battery that essentially converts electrical energy into chemical energy through the reversible insertion and extraction of lithium ions between positive and negative electrode materials. It is widely used in modern society.

[0003] The lithium battery casing serves as the protective and supporting carrier for the battery, directly affecting its safety, stability, and application compatibility. Under current technology, the production process of lithium battery casings involves welding. After the materials are welded into the casing, their effective elastic limit changes and exhibits localized unevenness. This results in the overall and local effective elastic limit of the casing being inconsistent with the raw materials, thereby altering the actual load-bearing capacity of the casing and affecting its safety protection, sealing, and stability.

[0004] Therefore, how to achieve true performance testing of the casing has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a multifunctional intelligent testing platform for lithium battery casings to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a multi-functional intelligent testing platform for lithium battery casings, comprising a base, a testing system, a first testing component, a second testing component, and a third testing component. The first testing component includes an upper mounting base and a lower mounting base. Limiting rods are installed at the lower corners of the upper mounting base, and a limiting seat is installed at the upper end of the lower mounting base. The installation positions of the limiting seats correspond to the installation positions of the limiting rods. A plurality of hydraulic push rods are installed at the lower end of the upper mounting base, and the output of the hydraulic push rods... A pressure plate is fixedly connected to the end of the lower mounting base. Several hydraulic push rods are installed on the upper end of the lower mounting base. A pressure block is fixedly connected to the output end of the hydraulic push rod. The pressure plate and the pressure block have different structures. The size and shape of the pressure plate are much larger than the pressure block. The shapes of each set of pressure plates and the pressure block are different. Several limiting sliders are provided on the upper end of the lower mounting base. A barometric pressure detector and several optical detectors are fixedly installed on the upper end of the lower mounting base. Several test boxes are installed around the lower mounting base. Electrical testing equipment is installed inside the test boxes.

[0007] According to the above technical solution, the second detection component includes a mounting plate 1 and a frame 1. A plurality of limiting posts 1 are installed on the upper end of the mounting plate 1, and a plurality of limiting plates 1 are installed on the periphery of the frame 1. The installation positions of the limiting posts 1 and the limiting plates 1 correspond one-to-one. The third detection component includes a mounting plate 2 and a frame 2. A support member is fixedly installed on the upper end of the mounting plate 2, and a plurality of limiting posts 2 are arranged around the periphery of the support member. The limiting posts 2 are fixedly installed on the upper end of the mounting plate 2. A plurality of limiting plates 2 are installed on the periphery of the frame 2. The installation positions of the limiting plates 2 and the limiting posts 2 correspond one-to-one. A pressure plate 2 and a pressure rod are alternately installed on the bottom of the frame 2. The shape of the pressure plate 2 and the pressure rod is rectangular, and the structural dimension of the pressure plate 2 is larger than that of the pressure rod.

[0008] According to the above technical solution, a plurality of guide rails are evenly installed on the upper end of the base, and a slide table is slidably connected above each group of guide rails. An electric telescopic rod is installed at the center of the upper end of the base, and a drag chain is provided on one side of the electric telescopic rod. A base is fixedly installed above each group of slide tables, and a through hole is opened on the base. One end of the drag chain is slidably connected to the base, and the other end is close to the through hole and fixedly connected to the lower end of the base. The output end of the electric telescopic rod is fixedly connected to the bottom end of the base. The detection system includes a control module and an analysis module.

[0009] According to the above technical solution, a frame is installed on the outside of the rear half of the base structure. The projection of the frame covers half of the rear end area of ​​the base. A data panel is installed on the frame. Guide rails are installed on the left and right side columns of the frame. A limit plate is slidably connected to the opposite side of the guide rails. A mesh frame is set below the limit plate. The mesh frame is made of multiple sets of independent steel frames welded together. Lifting rods are installed on the left and right sides of the upper end of the frame. Several pressure boosting rods are installed at the upper end of the frame. The installation position of each set of pressure boosting rods corresponds to the intersection point of each set of steel frames on the mesh frame. The output direction of the lifting rods and the pressure boosting rods is towards the base. The output end of the lifting rods is fixedly connected to the mesh frame. Pressure gauges are installed on the cylinders of the lifting rods and the pressure boosting rods.

[0010] According to the above technical solution, the first detection component, the second detection component and the third detection component are disposed below the grid frame, and a thermal imager is disposed directly above the grid frame, and the thermal imager is fixedly connected to the frame.

[0011] According to the above technical solution, the first detection component includes the following specific operating steps:

[0012] Step 1a: Open a gas delivery port and a gas pressure detection port on a flat part of the shell, and bolt the upper mounting base to the bottom of the grid frame, and bolt the lower mounting base to the upper end of the base to simulate the preload between the frame and the shell in a real environment;

[0013] Step 2a: The control module controls the pressure booster to apply pressure to the housing, the optical detector detects the degree of deformation of the housing sidewall, and the analysis module calculates the maximum expansion force that the housing can withstand;

[0014] Step 3a: The control module controls the hydraulic push rod to apply pressure to the housing, the optical detector detects the degree of deformation of the housing sidewall, and the analysis module calculates the maximum pressure that the housing can withstand.

[0015] According to the above technical solution, the first detection component includes the following specific operating steps:

[0016] Step 4a: Adjust the installation position of the shell, repeat steps 2a and 3a to obtain the new maximum expansion force and maximum pressure, apply pressure to the welding area to obtain the maximum expansion force and maximum pressure of the welding area, and the analysis module compares the maximum expansion force and maximum pressure of the welding area with the newly obtained maximum expansion force and maximum pressure. If the ratio is less than 0.8, it indicates that the processing is unqualified.

[0017] Step 5a: Repeat step 1a, insert the probe of the pressure detector into the housing through the pressure detection port, connect the gas delivery port to the external gas source pipeline, and ensure that the inflation pressure does not exceed the maximum expansion force in step 2a. If the pressure detector detects that the internal pressure of the housing is continuously decreasing, it indicates that the structure of the housing itself is unqualified.

[0018] According to the above technical solution, the second detection component includes the following specific operating steps:

[0019] Step 1b: Bolt the mounting plate to the upper end of the base, bolt the frame to the lower end of the grid, fix the plate to the upper end of the mounting plate with bolts, place several pressure blocks on the upper end of the plate, and the rest of the operation is the same as in Step 1a.

[0020] Step 2b: The control module controls the pressure booster rod to generate downward pressure on a pair of bearing blocks of the frame. When the plate undergoes plastic deformation, the analysis module calculates the maximum load that the plate can withstand in the pre-tightened state.

[0021] According to the above technical solution, step two b includes the following specific operational steps:

[0022] The analysis module calculates the ratio of the maximum load that the shell can withstand to the maximum load that the plate can withstand in step 3a.

[0023] If the ratio is less than 0.5, it indicates that there is a defect in the structural design of the shell, resulting in the overall load-bearing capacity of the shell being far lower than the load-bearing capacity of the plate material itself. The structural design should be optimized.

[0024] If the ratio is close to 1, it indicates that the structural design is efficient and the materials and structure of the shell are fully utilized. Therefore, the overall strength of the shell is directly determined by the material strength, providing strong data support for the selection of shell materials.

[0025] If the ratio is much greater than 1, it indicates that the load-bearing capacity of the shell is greater than that of a single plate, the structural design is excellent, and it can be used as the preferred solution in shell production.

[0026] According to the above technical solution, the third detection component includes the following specific operating steps:

[0027] Step 1c: Select the support component with the corresponding structure according to the shape of the shell to be tested, bolt the mounting plate to the upper end of the base, bolt the frame to the lower end of the grid frame, place the shell on the support component, and the rest of the operation is the same as the operation in Step 1a.

[0028] Step 2c: The alternately installed pressure plate 2 and pressure rod correspond to the unprocessed area and positioning groove at the upper end of the housing, respectively. The pressure plate 2 and pressure rod achieve uniform pressure transmission. The remaining operating principles are the same as those in Step 2b, and finally the maximum load of the housing for the battery array is obtained.

[0029] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention realizes mechanical testing of the entire shell and the welded area by setting a first detection component, and compares the mechanical properties of the overall shell and the mechanical properties of the welded area to determine whether the shell processing is reasonable; by setting a second detection component, mechanical testing of the plate material is realized, verifying whether the material selection and structural design are reasonable; by setting a third detection component, mechanical testing of the array battery shell is realized, expanding the application range of the shell. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the base structure of the present invention;

[0033] Figure 3This is a schematic diagram of the frame structure of the present invention;

[0034] Figure 4 This is a front view schematic diagram of the frame of the present invention;

[0035] Figure 5 This is the present invention. Figure 3 Schematic diagram of area A;

[0036] Figure 6 This is a schematic diagram of the structure of the first detection component of the present invention;

[0037] Figure 7 This is the present invention. Figure 6 Schematic diagram of area B;

[0038] Figure 8 This is a schematic diagram of the housing placement of the present invention;

[0039] Figure 9 This is the present invention. Figure 8 Schematic diagram of region C;

[0040] Figure 10 This is a bottom view of the upper mounting base of the present invention;

[0041] Figure 11 This is a schematic diagram of the operation of the first detection component of the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the second detection component of the present invention;

[0043] Figure 13 This is the present invention. Figure 12 Schematic diagram of region D;

[0044] Figure 14 This is a schematic diagram of the operation of the second detection component of the present invention;

[0045] Figure 15 This is a schematic diagram of the third detection component structure of the present invention;

[0046] Figure 16 This is a schematic diagram of the support structure of the present invention;

[0047] Figure 17 This is a bottom view of the frame of the present invention;

[0048] Figure 18 This is a schematic diagram of the operation of the third detection component of the present invention;

[0049] In the diagram: 1. Base; 2. Guide rail one; 3. Slide table; 4. Electric telescopic rod; 5. Cable chain; 6. Base; 7. Frame; 8. Data panel; 9. Guide rail two; 10. Limiting plate; 11. Space frame; 12. Lifting rod; 13. Pressure boosting rod; 14. Upper mounting base; 15. Lower mounting base; 16. Limiting seat; 17. Limiting rod; 18. Hydraulic push rod one; 19. Pressure plate one; 20. Hydraulic push rod two; 21. Pressure block; 22. Limiting slider; 23. Optical detector; 24. Air pressure detector; 25. Test box; 26. Thermal imager; 27. Mounting plate one; 28. Limiting post one; 29. ​​Limiting plate one; 30. Frame one; 31. Mounting plate two; 32. Support component; 33. Limiting post two; 34. Limiting plate two; 35. Frame two; 36. Pressure plate two; 37. Pressure rod. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Please see Figures 1-5 The present invention provides a technical solution: a multifunctional intelligent testing platform for lithium battery casings, comprising a base 1 and a testing system. Several guide rails 2 are evenly installed on the upper end of the base 1. A slide table 3 is slidably connected above each set of guide rails 2. An electric telescopic rod 4 is installed at the center of the upper end of the base 1. A drag chain 5 is provided on one side of the electric telescopic rod 4. A base 6 is fixedly installed above each set of slide tables 3. A through hole is opened on the base 6. One end of the drag chain 5 is slidably connected to the base 1, and the other end is close to the through hole and fixedly connected to the lower end of the base 6. The output end of the electric telescopic rod 4 is fixedly connected to the bottom end of the base 6.

[0052] A frame 7 is mounted on the exterior of the rear half of the base 1 structure. The projection of the frame 7 covers half of the rear end area of ​​the base 1. A data panel 8 is mounted on the frame 7. Guide rails 9 are mounted on the left and right side columns of the frame 7. A limit plate 10 is slidably connected to the opposite side of the guide rails 9. A mesh frame 11 is set below the limit plate 10. The mesh frame 11 is made of multiple sets of independent steel frames welded together. Lifting rods 12 are mounted on the left and right sides of the upper end of the frame 7. Several pressure boosting rods 13 are mounted on the upper end of the frame 7. The installation position of each set of pressure boosting rods 13 corresponds to the intersection point of each set of steel frames on the mesh frame 11. The output direction of the lifting rods 12 and the pressure boosting rods 13 is facing the base 1. The output end of the lifting rods 12 is fixedly connected to the mesh frame 11. The lifting rods 12 and the pressure boosting rods 13 are both hydraulically driven. Pressure gauges (not shown in the figure) are mounted on the cylinders of the lifting rods 12 and the pressure boosting rods 13 to directly display the oil pressure inside the cylinder.

[0053] The lower part of the grid frame 11 is provided with a first detection component, a second detection component and a third detection component, and the upper part of the grid frame 11 is provided with a thermal imager 26, which is fixedly connected to the frame 7.

[0054] like Figures 6-11 The first detection component includes an upper mounting base 14 and a lower mounting base 15. Limiting rods 17 are installed at the lower corners of the upper mounting base 14. The observation direction of the thermal imager 26 faces the lower mounting base 15. A limiting seat 16 is installed at the upper end of the lower mounting base 15, with the installation position of the limiting seat 16 corresponding to the installation position of the limiting rods 17. Several hydraulic push rods 18 are installed at the lower end of the upper mounting base 14, and pressure plates 19 are fixedly connected to the output ends of the hydraulic push rods 18. Several hydraulic push rods 2 are installed at the upper end of the lower mounting base 15. 0. The output end of the hydraulic push rod 20 is fixedly connected to the pressure block 21. The pressure plate 19 and the pressure block 21 have different structures. The size and shape of the pressure plate 19 are much larger than those of the pressure block 21. The shapes of each set of pressure plates 19 and pressure blocks 21 are different. Several limit sliders 22 are provided at the upper end of the lower mounting base 15. A barometric pressure detector 24 and several optical detectors 23 are fixedly installed at the upper end of the lower mounting base 15. Several test boxes 25 are installed around the lower mounting base 15. Electrical testing equipment (not shown in the figure) is installed inside the test box 25.

[0055] like Figures 12-14 The second detection component includes a mounting plate 27 and a frame 30. Several limiting posts 28 are installed on the upper end of the mounting plate 27, and several limiting plates 29 are installed on the periphery of the frame 30. The installation positions of the limiting posts 28 and the limiting plates 29 correspond one-to-one.

[0056] like Figures 15-18 The third detection component includes a mounting plate 2 31 and a frame 2 35. A support member 32 is fixedly installed on the upper end of the mounting plate 2 31. Several limiting posts 2 33 are provided around the support member 32. The limiting posts 2 33 are fixedly installed on the upper end of the mounting plate 2 31. Several limiting plates 2 34 are installed around the frame 2 35. The installation positions of the limiting plates 2 34 and the limiting posts 2 33 correspond one-to-one. A pressure plate 2 36 and a pressure rod 37 are alternately installed at the bottom of the frame 2 35. The shape of the pressure plate 2 36 and the pressure rod 37 are both rectangular. The structural dimensions of the pressure plate 2 36 are larger than those of the pressure rod 37.

[0057] The detection system includes a control module and an analysis module. The control module is used to send command signals to each component, the analysis module is used to receive and analyze the signals from each component, and the data panel 8 is used to display the analysis results of the analysis module.

[0058] Example 1: The first detection component includes the following steps:

[0059] Step 1a: Before the test begins, open a gas delivery port and a pressure testing port (not shown in the figure) on a flat area of ​​the housing. Bolt the upper mounting base 14 to the bottom of the grid frame 11, and bolt the lower mounting base 15 to the upper end of the base 6 (e.g., Figure 11 As shown), the electric telescopic rod 4 is in the retracted state, and the base 6 is located outside the projection of the frame 7. The lithium battery casing to be tested is placed above the lower mounting base 15, and the battery casing is limited by the limiting slider 22. The casing is then fixed to the upper part of the lower mounting base 15 with bolts (as shown). Figure 8 (As shown).

[0060] The cable chain 5 has several integrated wirings (not shown in the figure) inside, which pass through the through holes of the base 6 to connect the power supply to each electrical component.

[0061] The control module sends a working signal to the electric telescopic rod 4, and the output end of the electric telescopic rod 4 extends outward, driving the base 6 to move towards the projection area of ​​the frame 7. The base 6 drives the lower mounting seat 15 to move synchronously, and the lower mounting seat 15 drives the housing to move synchronously. When the electric telescopic rod 4 reaches the maximum stroke position, the electric telescopic rod 4 stops working, and the housing is located in the projection area of ​​the frame 7.

[0062] The control module sends a working signal to the lifting rod 12, the output end of the lifting rod 12 extends outward, the lifting rod 12 drives the limit plate 10 and the grid frame 11 to move downward, the grid frame 11 drives the upper mounting base 14 to move downward, and the upper mounting base 14 drives the limit rod 17 to move downward.

[0063] Furthermore, in actual working environments, lithium battery casings require external frames to limit their movement, creating a constrained state with a fixed preload. Therefore, the upper mounting base 14 is used to limit the vertical movement of the casing. Based on the height of the casing to be tested, a limiting rod 17 with a length slightly smaller than the casing's height is selected. When the upper mounting base 14 presses against the casing, the limiting rod 17 engages with the limiting seat 16, preventing the upper mounting base 14 from moving. Since the length of the limiting rod 17 is slightly less than the casing's height, the casing is slightly compressed as the upper mounting base 14 contacts the casing and continues downward until it is stopped by the limiting rod 17. This causes the upper mounting base 14 to apply a certain preload to the casing. The upper mounting base 14 and the lower mounting base 15 achieve rigid constraint of the casing in the vertical direction, simulating the preload between the frame and the casing in a real environment. This ensures that subsequent testing is conducted in the same mechanical environment, improving the accuracy of the test results.

[0064] Step 2a: After the material is welded into a shell, the effective elastic limit will change, resulting in the overall and local effective elastic limit of the shell being inconsistent with the raw material. If the relevant parameters of the shell are still based on the parameters of the raw material, it is easy to cause the design safety margin to fail, thereby causing unexpected plastic deformation and premature failure of the shell under the expected working load, or even causing safety accidents. Therefore, the actual load capacity of the shell should be further tested.

[0065] When the battery is charging or discharging or thermal runaway occurs, the internal cells expand, exerting outward pressure on the casing. Because the external frame limits the casing, the pressure causes the sidewalls of the casing to tend to expand outward.

[0066] The control module sends a command signal to the booster rod 13, causing the output end of the booster rod 13 to extend outward. The output end of the booster rod 13 acts on the upper end of the space frame 11, causing the space frame 11 to move downward. The space frame 11 drives the upper mounting seat 14 to move downward, and the upper mounting seat 14 exerts downward pressure on the housing. Since the limiting rod 17 limits the upper mounting seat 14, and the housing itself is bolted to the lower mounting seat 15, the compression of the housing in the vertical direction is restricted, causing the vertical force of the upper mounting seat 14 to be converted into a radial force, resulting in the sidewall of the housing to expand outward. The booster rod 13 is used to simulate the internal expansion force.

[0067] The expansion force causes the side wall of the shell to bulge outward. The deformation of the side of the shell is detected by the optical detector 23. The analysis module directly obtains the oil pressure when the shell deformation occurs through the pressure gauge on the cylinder of the booster rod 13, and calculates the pressure value applied by the booster rod 13. The calculation principle is the existing technology.

[0068] After the control module controls the pressure booster rod 13 to remove the pressure, the optical detector 23 detects whether the deformation of the shell sidewall has recovered and transmits the detection result to the analysis module. If the deformation recovers, it means that the pressure applied at this time caused elastic deformation of the shell. The control module controls the pressure booster rod 13 to work repeatedly, and the pressure applied each time gradually increases until the pressure booster rod 13 removes the pressure. The optical detector 23 detects that the deformation cannot be recovered, which means that the shell sidewall has undergone plastic deformation. The analysis module records the pressure generated by the pressure booster rod 13 when the shell undergoes plastic deformation. The analysis module subtracts the preload from the recorded pressure, which is the maximum expansion force that the shell can withstand.

[0069] Step 3a: In the actual use of lithium batteries, external pressure can cause the casing to deform. Due to the internal expansion force, the casing is subjected to tensile stress, and the external pressure is subjected to compressive stress. Therefore, under the same force magnitude, the deformation of the casing produced by the two forces is different. Therefore, it is impossible to determine the maximum load that the casing can withstand by detecting a single force.

[0070] Specifically, the shell that underwent plastic deformation in step 2a is replaced with a shell from the same batch, and the operation of step 1a is repeated. The control module issues a working command to the hydraulic push rod 18, and the output end of the hydraulic push rod 18 pushes the pressure plate 19 to compress the side wall of the shell over a wide range. The optical detector 23 is used to detect whether the deformation of the side wall of the shell has recovered. When the side wall undergoes plastic deformation, the analysis module subtracts the preload from the pressure generated by the hydraulic push rod 18 at this time, which is the maximum pressure that the shell can withstand. The detection principle is the same as that in step 2a.

[0071] Step 4a: Weld defects exist in the welded area, making the welded area a weak point in mechanical structure. Its elastic limit and maximum load are usually lower than other parts of the shell. It is easy to miss the risk of local failure by only conducting overall inspection.

[0072] As structural joints, welded areas are subject to material heterogeneity and defect risks due to the difference in mechanical properties between the weld metal and the raw materials. To prevent these areas from cracking or deforming first when the battery cell expands, the frame applies stronger pre-tightening force to the welded areas through structures such as reinforcing ribs and positioning clips.

[0073] Therefore, in step one a, the position of the housing during installation is adjusted so that the welding area is aligned with the pressure block 21, and the length of the limiting rod 17 is appropriately changed so that the upper mounting seat 14 applies a greater preload to the housing, simulating the stress situation of the welding area in a real environment.

[0074] Furthermore, the operation in step 2a is repeated to obtain the maximum expansion force of the shell under the new preload.

[0075] Furthermore, the control module sends a working signal to the pressure booster rod 13 near the welding area and applies pressure to the shell according to the principle in step 2a. At this time, the radial force acts more on the side wall corresponding to the welding area. The optical detector 23 is used to detect whether the deformation is restored. When the deformation is not restored, the pressure applied by the pressure booster rod 13 minus the new pre-tightening force is the maximum expansion force that the welding area can withstand.

[0076] Furthermore, the analysis module calculates the ratio of the maximum expansion force in the welded area to the total maximum expansion force. If the ratio is less than 0.8, the welded part is deemed to be substandard and should be scrapped.

[0077] Furthermore, the housing to be tested is replaced, and the above operation of applying a new preload to the housing is repeated. The control module drives the hydraulic push rod 20, which drives the pressure block 21 to apply pressure to the welding area. The optical detector 23 is used to detect whether the deformation of the welding area is restored. When the optical detector 23 detects that the deformation cannot be restored, it indicates that the welding area has undergone plastic deformation. At this time, the pressure applied by the hydraulic push rod 20 minus the new preload is the maximum load that the welding area can withstand.

[0078] The analysis module calculates the ratio of the maximum welding load to the overall maximum load obtained in step 3a. If the ratio is less than 0.8, the welding part is judged to be unqualified and should be scrapped.

[0079] Furthermore, if it is necessary to test the fatigue resistance of the welded area, the hydraulic push rod 20 can be controlled to apply pressure for 1000 cycles within 80% of the elastic deformation threshold. After a certain number of cycles, the optical detector 23 monitors whether the deformation has accumulated. If the accumulated deformation exceeds the allowable error range, fatigue failure is judged.

[0080] Step 5a: Replace with a new housing. Repeat step 1a, inserting the probe of the pressure detector 24 into the housing through the pressure detection port. Connect the gas delivery port to the external gas source pipeline. The control module sends a command signal to the external gas source, sets the inflation pressure, and sends gas into the housing. The inflation pressure should not exceed the maximum expansion force in step 2a to avoid premature deformation of the housing due to inflation. When the pressure detector 24 detects that the internal pressure of the housing reaches the set value, the control module commands the gas source to stop inflation. The analysis module records the pressure data in real time, and the thermal imager 26 observes the housing temperature to eliminate pressure fluctuations caused by temperature changes. After a period of time, if the pressure detector 24 detects that the internal pressure of the housing is continuously decreasing, it indicates that the structure of the housing itself is unqualified, and the tested housing should be scrapped.

[0081] It should be noted that since the pressure detection port and gas delivery port are located in the flat area of ​​the outer shell, away from stress concentration areas such as the welding area, they can be used as heat dissipation ports after the shell is actually installed.

[0082] Furthermore, the casing can be replaced with an assembled lithium battery for testing. The cable chain 5 is used to integrate the wiring, powering on the lithium battery and the electrical testing equipment in the test box 25. Hydraulic push rod 18 and hydraulic push rod 20 are used to apply pressure to the lithium battery. The above steps 1a to 4a are repeated to simulate the external influences during actual operation. The electrical testing equipment tests the electrical performance of the lithium battery under different external influences, providing data support for the optimized design of the lithium battery.

[0083] Example 2: Inspecting the sheet metal before welding the shell using a second inspection component, including the following steps:

[0084] Step 1b: Bolt mounting plate 27 to the upper end of base 6, bolt frame 30 to the lower end of space frame 11, and fix the plate to the upper end of mounting plate 27 with bolts (e.g., Figure 12 As shown in the figure, several pressure blocks (not shown in the figure) are placed on the upper end of the plate. The pressure blocks are used to transmit pressure.

[0085] The remaining operations are the same as those in step 1a. It should be noted that the working principle of the limiting post 28 is the same as that of the limiting rod 17, and the working principle of the limiting plate 29 is the same as that of the limiting seat 16. The limiting post 28, the limiting plate 29 and the frame 30 are used to simulate the pre-tightening force on the plate. Before welding the plate, the reliability of the material and the stability of the process are evaluated, and potential safety risks are prevented.

[0086] Step 2b: The production process of the sheet is existing technology. Therefore, the relevant mechanical properties and corresponding ultimate load of the sheet under normal conditions are known. However, under the action of preload, the sheet will generate an initial preload stress in the same direction as the preload. The initial preload stress occupies part of the material's ultimate stress reserve. When the sheet bears a working load, if the working stress and the preload stress are superimposed, the total stress must be controlled within the material's ultimate stress. Therefore, the maximum value of the additional working load that the sheet can withstand under preload is necessarily less than the ultimate load of the sheet under normal conditions.

[0087] The control module sends a command signal to the booster rod 13, and the output end of the booster rod 13 extends outward. The booster rod 13 causes the frame 30 to exert downward pressure on the bearing block. The bearing block transmits the pressure to the plate. When the plate undergoes plastic deformation, the analysis module subtracts the preload from the actual pressure recorded by the booster rod 13, which is the maximum load that the plate can withstand in the preloaded state.

[0088] The analysis module calculates the ratio of the maximum load that the shell can withstand to the maximum load that the plate can withstand in step 3a of Example 1.

[0089] If the ratio is less than 0.5, it indicates that there is a defect in the structural design of the shell, resulting in the overall load-bearing capacity of the shell being far lower than the load-bearing capacity of the plate material itself, and the structural design should be optimized.

[0090] If the ratio is close to 1, it indicates that the structural design is efficient and the materials and structure of the shell are fully utilized. Therefore, the overall strength of the shell is directly determined by the strength of the materials, providing strong data support for the selection of shell materials.

[0091] If the ratio is much greater than 1, it indicates that the load-bearing capacity of the shell is greater than that of a single plate, the structural design is excellent, and it can be used as the preferred solution in shell production.

[0092] Example 3: In applications requiring large-scale, long-term stable power supply, a large number of lithium battery cells need to be combined into a battery array through series, parallel, or mixed connection. Therefore, the housing structure required for the battery array is relatively long, and positioning slots are evenly provided on the upper end of the housing to facilitate the rapid positioning of individual cells. The third detection component is used to detect the battery array housing.

[0093] Step 1c: Select the corresponding support component 32 according to the shape of the shell to be tested, bolt the mounting plate 31 to the upper end of the base 6, and bolt the frame 35 to the lower end of the space frame 11 (e.g., Figure 18 As shown), the housing is placed on top of the support member 32, and the housing is bolted to the mounting plate 31. Since the structure of the battery array housing is relatively long, the hollow structure of the housing is supported by the support member 32 to prevent the housing from wrinkling and denting during the pressure test, which would affect the accuracy of the test results. The remaining operations are the same as those in step one a. It should be noted that the working principle of the limiting post 33 is the same as that of the limiting rod 17, the working principle of the limiting plate 34 is the same as that of the limiting seat 16, and the principle of applying pre-tightening force to the housing is the same as that in embodiment two.

[0094] Step 2c: The alternating pressure plate 36 and pressure rod 37 correspond to the unprocessed area and positioning groove at the upper end of the housing, respectively. The pressure is uniformly transmitted through the pressure plate 36 and pressure rod 37. The remaining operating principles are the same as those in Step 2b, and the maximum load of the housing for the battery array is finally obtained.

[0095] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0096] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional intelligent testing platform for lithium battery casings, comprising a base (1), a testing system, a first testing component, a second testing component, and a third testing component, characterized in that: The first detection component includes an upper mounting base (14) and a lower mounting base (15). Limiting rods (17) are installed at the lower corners of the upper mounting base (14). A limiting seat (16) is installed at the upper end of the lower mounting base (15). The installation position of the limiting seat (16) corresponds to the installation position of the limiting rod (17). Several hydraulic push rods (18) are installed at the lower end of the upper mounting base (14). A pressure plate (19) is fixedly connected to the output end of each hydraulic push rod (18). Several hydraulic push rods (20) are installed at the upper end of the lower mounting base (15). The output end of the plate is fixedly connected to a pressure block (21). The structure of the pressure plate (19) and the pressure block (21) are different. The size and shape of the pressure plate (19) are much larger than that of the pressure block (21). The shapes of the pressure plate (19) and the pressure block (21) in each group are different. The upper end of the lower mounting base (15) is provided with several limiting sliders (22). The upper end of the lower mounting base (15) is fixedly installed with a barometric pressure detector (24) and several optical detectors (23). Several test boxes (25) are installed around the lower mounting base (15). Electrical testing equipment is installed inside the test boxes (25). The second detection component includes a mounting plate (27) and a frame (30). A plurality of limiting posts (28) are installed on the upper end of the mounting plate (27), and a plurality of limiting plates (29) are installed on the periphery of the frame (30). The installation positions of the limiting posts (28) and the limiting plates (29) correspond one-to-one. The third detection component includes a mounting plate (31) and a frame (35). A support member (32) is fixedly installed on the upper end of the mounting plate (31), and the periphery of the support member (32) is provided with There are several limiting posts (33), which are fixedly installed on the upper end of the mounting plate (31). Several limiting plates (34) are installed on the periphery of the frame (35). The installation positions of the limiting plates (34) and the limiting posts (33) correspond one-to-one. The bottom of the frame (35) is alternately equipped with pressure plates (36) and pressure rods (37). The shape of the pressure plates (36) and the pressure rods (37) is rectangular. The structural dimensions of the pressure plates (36) are larger than those of the pressure rods (37). The upper end of the base (1) is evenly equipped with several guide rails (2), and a slide table (3) is slidably connected above each set of guide rails (2). An electric telescopic rod (4) is installed at the center of the upper end of the base (1). A drag chain (5) is provided on one side of the electric telescopic rod (4). A base (6) is fixedly installed above each set of slide tables (3). A through hole is opened on the base (6). One end of the drag chain (5) is slidably connected to the base (1), and the other end is close to the through hole and fixedly connected to the lower end of the base (6). The output end of the electric telescopic rod (4) is fixedly connected to the bottom end of the base (6). The detection system includes a control module and an analysis module.

2. The multifunctional intelligent testing platform for lithium battery casings according to claim 1, characterized in that: A frame (7) is installed on the exterior of the rear half of the base (1). The projection of the frame (7) covers half of the rear end area of ​​the base (1). A data panel (8) is installed on the frame (7). Guide rails (9) are installed on the left and right side columns of the frame (7). A limit plate (10) is slidably connected to the opposite side of the guide rails (9). A mesh frame (11) is provided below the limit plate (10). The mesh frame (11) is made of multiple independent steel frames welded together. Lifting rods (12) are installed on the upper left and right sides of the frame (7). Several boosting rods (13) are installed on the upper end of the frame (7). The installation position of each set of boosting rods (13) corresponds to the intersection point of each set of steel frames on the mesh frame (11). The output direction of the lifting rods (12) and the boosting rods (13) are both towards the base (1). The output end of the lifting rods (12) is fixedly connected to the mesh frame (11). Pressure gauges are installed on the cylinders of the lifting rods (12) and the boosting rods (13).

3. The multifunctional intelligent testing platform for lithium battery casings according to claim 2, characterized in that: The first detection component, the second detection component and the third detection component are located below the mesh frame (11), and a thermal imager (26) is located directly above the mesh frame (11). The thermal imager (26) is fixedly connected to the frame (7).

4. A method of using a multifunctional intelligent testing platform for lithium battery casings, comprising using the multifunctional intelligent testing platform for lithium battery casings as described in claim 3, characterized in that: The first detection component includes the following specific operating steps: Step 1a: Open a gas delivery port and a gas pressure detection port on the flat part of the shell, bolt the upper mounting base (14) to the bottom end of the grid frame (11), and bolt the lower mounting base (15) to the upper end of the base (6) to realize the simulation of the pre-tightening force between the frame and the shell in a real environment; Step 2a: The control module controls the pressure bar (13) to apply pressure to the shell, the optical detector (23) detects the degree of deformation of the shell sidewall, and the analysis module calculates the maximum expansion force that the shell can withstand; Step 3a: The control module controls the hydraulic push rod (18) to apply pressure to the housing, the optical detector (23) detects the degree of deformation of the side wall of the housing, and the analysis module calculates the maximum pressure that the housing can withstand.

5. The method of using the multifunctional intelligent testing platform for lithium battery casings according to claim 4, characterized in that: The first detection component includes the following specific operating steps: Step 4a: Adjust the installation position of the shell, repeat steps 2a and 3a to obtain the new maximum expansion force and maximum pressure, apply pressure to the welding area to obtain the maximum expansion force and maximum pressure of the welding area, and the analysis module compares the maximum expansion force and maximum pressure of the welding area with the newly obtained maximum expansion force and maximum pressure. If the ratio is less than 0.8, it indicates that the processing is unqualified. Step 5a: Repeat step 1a, insert the probe end of the pressure detector (24) into the housing through the pressure detection port, connect the gas delivery port to the external gas source pipeline, and ensure that the inflation pressure does not exceed the maximum expansion force in step 2a. If the pressure detector (24) detects that the internal pressure of the housing is continuously decreasing, it indicates that the structure of the housing itself is unqualified.

6. The method of using the multifunctional intelligent testing platform for lithium battery casings according to claim 4, characterized in that: The second detection component includes the following specific operating steps: Step 1b: Bolt the mounting plate (27) to the upper end of the base (6), bolt the frame (30) to the lower end of the grid frame (11), fix the plate to the upper end of the mounting plate (27) with bolts, place several pressure blocks on the upper end of the plate, and the rest of the operation is the same as the operation in step 1a. Step 2b: The control module controls the pressure booster (13) to make the frame (30) exert downward pressure on the pressure block. When the plate undergoes plastic deformation, the analysis module calculates the maximum load that the plate can withstand in the pre-tightened state.

7. The method of using the multifunctional intelligent testing platform for lithium battery casings according to claim 6, characterized in that: Step 2b includes the following specific operational steps: The analysis module calculates the ratio of the maximum load that the shell can withstand to the maximum load that the plate can withstand in step 3a. If the ratio is less than 0.5, it indicates that there is a defect in the structural design of the shell, resulting in the overall load-bearing capacity of the shell being far lower than the load-bearing capacity of the plate material itself. The structural design should be optimized. If the ratio is close to 1, it indicates that the structural design is efficient and the materials and structure of the shell are fully utilized. Therefore, the overall strength of the shell is directly determined by the material strength, providing strong data support for the selection of shell materials. If the ratio is much greater than 1, it indicates that the load-bearing capacity of the shell is greater than that of a single plate, the structural design is excellent, and it can be used as the preferred solution in shell production.

8. The method of using the multifunctional intelligent testing platform for lithium battery casings according to claim 4, characterized in that: The third detection component includes the following specific operating steps: Step 1c: Select the support member (32) with the corresponding structure according to the shape of the shell to be tested, bolt the mounting plate two (31) to the upper end of the base (6), bolt the frame two (35) to the lower end of the grid frame (11), place the shell on the support member (32), and the rest of the operation is the same as the operation in step 1a. Step 2c: The alternating installation of the pressure plate 2 (36) and the pressure rod (37) corresponds to the unprocessed area and positioning groove at the upper end of the housing, respectively. The pressure transmission uniformity is achieved through the pressure plate 2 (36) and the pressure rod (37). The remaining operating principles are the same as those in step 2b, and finally the maximum load of the housing for the battery array is obtained.

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