A lithium ion battery cell charge-discharge cycle test device and method

Abstract

The application discloses a lithium ion battery cell charging and discharging cycle test device, and relates to the technical field of battery cell testing.The device comprises a test circular table, a control circular surface, a clamping and positioning device, a lifting adjusting device, a limiting rod, a moving adjusting device and a probe device.The control circular surface is fixed at the center of the test circular table and is internally provided with a driving mechanism.The clamping and positioning device is rotatably arranged on the control circular surface and is connected with the driving mechanism in the control circular surface at the bottom center.The lifting adjusting device is arranged on the test circular table.The limiting rod is connected with the top of the lifting adjusting device and is fixedly connected with the top of the clamping and positioning device.The moving adjusting device is arranged on the inner side of the lifting adjusting device.The probe device is fixed on the moving adjusting device, corresponds to the positive and negative poles of the battery cell, and is connected with a charging and discharging device.The application realizes the quick switching, stable clamping and reliable contact of the cylindrical and square battery cells, improves the test universality, precision and efficiency, and meets the performance verification demand of large-scale battery cells.

Description

Technical Field

[0001] This invention relates to the field of battery cell testing technology, and more specifically, to a lithium-ion battery cell charge-discharge cycle testing device and method. Background Technology

[0002] In the research and development and production of lithium-ion batteries, charge-discharge cycle testing of cells is a crucial step in evaluating battery performance. Traditional testing devices generally suffer from the following technical bottlenecks: First, poor adaptability to cell shapes; cylindrical and prismatic cells require different fixing mechanisms due to structural differences (such as different electrode distribution positions and sidewall curvatures), resulting in low equipment versatility. Second, insufficient clamping stability; rigid clamps are prone to damaging the cell casing and cannot accommodate the minute displacement requirements of the cells during testing. Third, low probe contact reliability; electrodes and probes often experience poor contact or overvoltage damage due to dimensional deviations and unstable contact pressure. Fourth, cumbersome testing procedures; electrode positioning and probe adjustment for cells of different shapes require manual intervention, leading to low efficiency. Although some existing devices attempt to improve these problems through adjustable clamps or movable probes, none have achieved rapid switching between cylindrical and prismatic cell testing or coordinated optimization of clamping and probe contact, making it difficult to meet the accuracy and efficiency requirements of large-scale cell performance verification. Therefore, it is necessary to provide a lithium-ion battery cell charge-discharge cycle testing device and method to solve the problems mentioned in the background art. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a lithium-ion battery cell charge-discharge cycle testing device and method, comprising:

[0004] The test truncated cone supports the cyclic testing device.

[0005] The control circle is fixed at the center of the test circle and has a drive mechanism inside.

[0006] The clamping and positioning device is rotatably mounted on the control circular surface, and its bottom center is connected to the drive mechanism inside the control circular surface;

[0007] The lifting and adjusting device is installed on the test platform;

[0008] Limiting rod; connected to the top of the lifting and adjusting device and fixedly connected to the top of the clamping and positioning device;

[0009] A movable adjustment device is located inside the lifting adjustment device;

[0010] The probe device is fixed on the movable adjustment device, corresponds to the positive and negative terminals of the battery cell, and is connected to the charging and discharging equipment.

[0011] Furthermore, preferably, the clamping and positioning device includes:

[0012] Two sets of rotating positioning rods are symmetrically distributed vertically, with two rods in each set. The center of the lower rotating positioning rod is connected to the drive mechanism inside the control circle. The two rotating positioning rods in the same set rotate in opposite directions, and each rotating positioning rod has two symmetrically distributed slides.

[0013] The clamping assembly is set to correspond to the slide rail on the rotating positioning rod, and the upper and lower ends are respectively slidably set on the slide rails of the upper and lower rotating positioning rods;

[0014] The support plate, located at the top center of the lower rotating positioning rod, supports the battery cell;

[0015] The auxiliary control mechanism is fixed in the middle of the limit rod and connected to the top center of the upper rotating positioning rod.

[0016] Furthermore, preferably, the clamping assembly includes:

[0017] Two active sliders are symmetrically distributed vertically, and are slidably positioned in the slides corresponding to the vertical rotating positioning rods.

[0018] Two connecting columns are symmetrically distributed vertically and fixed to the inner sides of the two active sliders;

[0019] A clamping cylinder is positioned between the connecting cylinders, and its diameter is larger than that of the connecting cylinders, to clamp the battery cell.

[0020] The telescopic shaft connects the two ends of the clamping cylinder to the corresponding active slider;

[0021] The limiting bushings are fixed at both ends of the clamping cylinder and are located inside the connecting cylinder.

[0022] The buffer spring is sleeved on the telescopic shaft and located inside the limiting shaft sleeve.

[0023] Furthermore, preferably, the lifting adjustment device includes:

[0024] The fixed frame is set on the top of the test frustum and is located outside the clamping and positioning device;

[0025] The adjustable rollers are arranged in a square pattern, with four rollers rotating at the four corners of the fixed frame and fitting against the side of the test platform.

[0026] The first lifting column is fixed on the right side of the fixed frame and has a first movable slider inside. The upper part of the first movable slider is fixedly connected to one end of the limiting rod, and the lower part is connected to a connecting telescopic plate.

[0027] The second lifting column is set in correspondence with the first lifting column and is fixed on the left side of the fixed frame. The auxiliary slider and the second movable slider are arranged sequentially from top to bottom inside. The auxiliary slider is fixedly connected to the other end of the limiting rod, and the second movable slider is fixed with a control telescopic plate.

[0028] Furthermore, as a preferred embodiment, the movable adjustment device is provided in two parts, corresponding to the connecting telescopic plate and the control telescopic plate respectively. It is fixedly connected to the connecting telescopic plate and rotatably connected to the control telescopic plate. The movable adjustment device includes a connecting slide rail and an adjustment slider slidably disposed on the connecting slide rail.

[0029] Furthermore, preferably, the probe device includes:

[0030] Connect the control base and fix it on the movable adjustment device;

[0031] The central fixed circular surface is fixed to the top center of the connecting control base;

[0032] The outer arc body is provided with multiple groups in a ring-shaped distribution, and each group has multiple groups distributed outward from the center.

[0033] The probe assembly is movable and positioned on the top of the central fixed circular surface and the outer arc body, and the number of probe assemblies on each outer arc body increases from the center outwards;

[0034] An adjustment ring assembly is provided corresponding to the outer arc body and fixed on the corresponding outer arc body, and the probe assembly passes through the adjustment ring assembly.

[0035] Furthermore, preferably, the connection control base includes:

[0036] A control groove is provided corresponding to the outer arc body and fixed to the top of the connecting control base, with the end of the control groove facing the center;

[0037] A compression spring is installed inside the control slot;

[0038] The connecting plate is movably positioned within the control slot, near the center end, with its side fixedly connected to the compression spring and its top fixedly connected to the top of the outer arc.

[0039] Furthermore, preferably, the probe assembly includes:

[0040] The needle is positioned at the top of the outer arc body, moving up and down.

[0041] An auxiliary spring is fitted onto the needle tip, located between the tip of the needle and the outer arc.

[0042] Furthermore, preferably, the adjusting ring assembly includes:

[0043] The inner adjusting inclined ring is a telescopic structure with an inclined surface at the top and a through hole running vertically through the inside. The bottom is fixedly connected to the connecting plate, and the through hole corresponds to the probe assembly.

[0044] The outer adjusting ring is a telescopic structure, fixed to the outside of the inner adjusting oblique ring, and extends and retracts synchronously with the inner adjusting oblique ring. It is equipped with a control spring inside, and the stiffness of the control spring is greater than that of the compression spring.

[0045] A method for using a lithium-ion battery cell charge-discharge cycle testing device includes the following steps:

[0046] Step 1: Determine whether the battery cell is cylindrical or square. For cylindrical cells, the second sliding block in the second lifting column moves the probe device on the moving adjustment device to the bearing plate above the center of the lower rotating positioning rod via the control telescopic plate. The telescopic plate then moves the probe device on the moving adjustment device corresponding to the first lifting column to the bottom center of the upper rotating positioning rod. With the upper and lower probe devices aligned, the cylindrical cell is placed between the upper and lower probe devices. For square cells, the second sliding block moves the lower probe device upward and flips it with the control telescopic plate, so that the two moving adjustment devices are on the same horizontal plane. The square cell is then placed on the bearing plate, and the two probe devices are moved and adjusted to the terminal of the square cell.

[0047] Step 2: Next, the clamping component in the clamping and positioning device moves on the slide of the rotating positioning rod, and the rotating positioning rods in the same group rotate in opposite directions, driving the clamping component to fix and clamp the side of the battery cell.

[0048] Step 3: Then, the first moving slider and the auxiliary slider drive the limit rod to move down, causing the upper rotating positioning rod and the probe device to move down. The probe device is connected to the battery cell terminal, and the charging and discharging equipment charges the battery at the connection point of the terminal and the corresponding probe assembly according to the terminal specifications.

[0049] Step 4: After charging is complete, let the battery cell rest, then discharge it, and let it rest again after discharging. Repeat this charging → resting → discharging → resting cycle multiple times.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] In this invention, the coordinated design of the rotating positioning rod and the clamping assembly in the clamping and positioning device enables compatible clamping of cylindrical and square battery cells, adapting to the fixing requirements of battery cells of different shapes.

[0052] The elastic structure of the telescopic shaft and the buffer spring allows the battery cell to be finely adjusted up and down while maintaining a stable clamping force, thus avoiding damage to the battery cell and improving the reliability of probe contact.

[0053] By adjusting the linkage design of the ring assembly and the probe assembly, the probe automatically adapts to the deviation of the pole size, ensuring stable contact pressure and preventing damage from poor contact or overpressure.

[0054] By precisely coordinating the lifting and moving adjustment devices, the horizontal position and vertical height of the probe can be automatically adjusted, thereby improving the positioning accuracy of the pole and the testing efficiency.

[0055] The modular structural design enables rapid switching between cylindrical and square cell testing, improving equipment versatility and meeting the needs of large-scale cell performance verification scenarios. Attached Figure Description

[0056] Figure 1 A schematic diagram of the overall structure of a lithium-ion battery cell charge-discharge cycle testing device;

[0057] Figure 2 A schematic diagram of the clamping and positioning device and the lifting and adjusting device;

[0058] Figure 3 This is a schematic diagram of the clamping component structure;

[0059] Figure 4 This is a schematic diagram of the lifting and adjusting device.

[0060] Figure 5 A schematic diagram of the lifting column and the movable adjustment device;

[0061] Figure 6 This is a schematic diagram of the structure during the testing of a square battery cell.

[0062] Figure 7 This is a schematic diagram of the probe device structure;

[0063] Figure 8 This is a schematic diagram of the cross-sectional structure of the probe device;

[0064] In the diagram: 1. Test cylinder; 2. Control cylinder; 3. Clamping and positioning device; 4. Lifting and adjusting device; 5. Limiting rod; 6. Moving and adjusting device; 7. Probe device; 31. Rotating positioning rod; 32. Clamping assembly; 33. Bearing plate; 34. Auxiliary control mechanism; 41. Fixed frame; 42. Adjusting roller; 43. First lifting column; 44. Second lifting column; 61. Connecting slide rail; 62. Adjusting slider; 71. Connecting control base; 72. Central fixed circle 73. Outer arc body; 74. Probe assembly; 75. Adjusting ring assembly; 321. Active slider; 322. Connecting column; 323. Clamping cylinder; 324. Telescopic shaft; 325. Restricting bushing; 326. Buffer spring; 431. Connecting telescopic plate; 441. Control telescopic plate; 711. Control groove; 712. Compression spring; 713. Connecting plate; 741. Needle; 742. Auxiliary spring; 751. Inner adjusting oblique ring; 752. Outer adjusting ring. Detailed Implementation

[0065] Please see Figures 1 to 8 In this embodiment of the invention, a lithium-ion battery cell charge-discharge cycle testing device and method includes:

[0066] Test truncated cone 1, bearing the cyclic testing device;

[0067] The control circular surface 2 is fixed at the center of the test circular platform 1, and has a drive mechanism inside;

[0068] The clamping and positioning device 3 is rotatably mounted on the control circular surface 2, and its bottom center is connected to the internal drive mechanism of the control circular surface 2;

[0069] The lifting and adjusting device 4 is installed on the test platform 1;

[0070] Limiting rod 5; connected to the top of lifting and adjusting device 4, and fixedly connected to the top of clamping and positioning device 3;

[0071] The movable adjustment device 6 is located inside the lifting adjustment device 4;

[0072] The probe device 7 is fixed on the movable adjustment device 6, corresponds to the positive and negative terminals of the battery cell, and is connected to the charging and discharging equipment.

[0073] In this embodiment, the clamping and positioning device 3 includes:

[0074] Two sets of rotating positioning rods 31 are symmetrically distributed vertically, with two rods in each set. The center of the lower rotating positioning rod 31 is connected to the drive mechanism inside the control circle 2. The two rotating positioning rods 31 in the same set rotate in opposite directions, and each rotating positioning rod 31 has two symmetrically distributed slides.

[0075] The clamping assembly 32 is configured to correspond to the slide rail on the rotating positioning rod 31, and its upper and lower ends are respectively slidably mounted on the slide rails of the upper and lower rotating positioning rods 31.

[0076] The support plate 33 is located at the top center of the lower rotating positioning rod 31 and supports the battery cell;

[0077] The auxiliary control mechanism 34 is fixed in the middle of the limit rod 5 and connected to the top center of the upper rotating positioning rod 31.

[0078] In other words, when testing a cylindrical battery cell, the cell is placed on the lower probe device 7. Then, the lifting adjustment device 4 moves the limiting rod 5, the upper rotating positioning rod 31, and the upper probe device 7 downwards, bringing the upper probe device 7 close to the top terminal of the battery cell. Simultaneously, the middle of the clamping assembly 32 aligns with the side of the battery cell. The clamping assembly 32 then slides towards the center on the slide rail of the rotating positioning rod 31, fitting against the side wall of the battery cell to clamp and fix it. After clamping and fixing the battery cell, the clamping assembly 32 allows the battery cell to move up and down with it. The lifting adjustment device 4 then moves the upper rotating positioning rod 31 downwards via the limiting rod 5, bringing the probe device 7 into contact with the top and bottom ends of the cylindrical battery cell for charge-discharge testing. When testing a square battery cell, the terminals are all located at the top, and the lower probe... The device 7 is moved upward to the same horizontal plane as the upper probe device 7, and the square battery cell is placed on the support plate 33. The lifting adjustment device 4 drives the limiting rod 5, the upper rotating positioning rod 31 and the probe device 7 to move downward, so that the probe device 7 is close to the top terminal of the battery cell. The middle part of the clamping assembly 32 corresponds to the side of the battery cell. Then, the two rotating positioning rods 31 in the lower and upper sets of rotating positioning rods 31 are controlled to rotate synchronously in opposite directions by the internal drive mechanism of the control circular surface 2 and the auxiliary control mechanism 34 at the top. The clamping assembly 32 moves towards the center on the slide to clamp and fix the square battery cell. Then, the probe device 7 is moved and adjusted by the moving adjustment device 6 so that the probe device 7 corresponds to the terminal of the square battery cell. Then, the lifting adjustment device 4 drives the probe device 7 to move downward and connect with the terminal of the square battery cell to perform charge and discharge tests.

[0079] In this embodiment, the clamping assembly 32 includes:

[0080] Two active sliders 321 are symmetrically distributed vertically and are slidably positioned in the slides corresponding to the vertical rotation positioning rods 31.

[0081] Two connecting columns 322 are symmetrically distributed vertically and fixed to the inner side of the two active sliders 321;

[0082] A clamping cylinder 323 is positioned between connecting cylinders 322 and has a diameter larger than the connecting cylinders 322 to clamp the battery cell.

[0083] The telescopic shaft 324 connects the two ends of the clamping cylinder 323 and the corresponding active slider 321 respectively;

[0084] The limiting bushing 325 is fixed at both ends of the clamping cylinder 323 and is located inside the connecting cylinder 322;

[0085] The buffer spring 326 is sleeved on the telescopic shaft 324 and located inside the limiting sleeve 325.

[0086] In other words, the active slider 321 drives the clamping assembly 32 to move along the slide of the rotating positioning rod 31, causing the clamping cylinder 323 to contact the battery cell and fix it. Before the clamping cylinder 323 fixes the battery cell, according to the height of the battery cell, when the upper probe device 7 moves down close to the electrode, the upper and lower telescopic shafts 324 and buffer springs 326 contract synchronously, so that the clamping cylinder 323 is always in the middle between the upper and lower rotating positioning rods 31, thereby clamping the battery cell. Under the action of the telescopic shaft 324 and buffer spring 326, while clamping and fixing the battery cell, the clamping cylinder 323 can move up and down with the battery cell and adjust accordingly, and assist the upper probe device 7 in moving and connecting with the electrode of the battery cell. When testing the cylindrical battery cell, after the clamping cylinder 323 clamps and fixes the cylindrical battery cell, the upper probe device 7 moves down to fit against the top electrode and pushes the cylinder... The cylindrical battery cell moves downwards following the clamping cylinder 323, causing the lower probe device 7 to compress and fit against the bottom of the cylindrical battery cell. The upper and lower telescopic shafts 324 and buffer springs 326 extend and retract respectively to assist in the movement. When testing a square battery cell, after the clamping cylinder 323 clamps and fixes the square battery cell, the two upper probe devices 7 move downwards synchronously to connect with the top electrode. During the downward movement, the clamping cylinder 323 remains fixed in position due to the constraint of the battery cell. The upper telescopic shaft 324 and buffer springs 326 then retract, assisting the probe device 7 in connecting with the electrode. Furthermore, under the action of the buffer springs 326, after the test is completed, the clamping cylinder 323 returns to its initial state. The buffer springs 326 absorb the impact force during lifting and lowering adjustments, preventing damage from overpressure during probe contact. The limiting sleeve 325 ensures the stability of the movement trajectory of the telescopic shaft 324 and buffer springs 326, avoiding test errors caused by clamping deviation.

[0087] In this embodiment, the lifting adjustment device 4 includes:

[0088] The fixing frame 41 is set on the top of the test frustum 1 and is located outside the clamping and positioning device 3;

[0089] Adjustable rollers 42 are arranged in a square shape, and are rotatably set at the four corners of the fixed frame 41, fitting against the side of the test platform 1;

[0090] The first lifting column 43 is fixed on the right side of the fixed frame 41 and has a first movable slider inside. The upper part of the first movable slider is fixedly connected to one end of the limiting rod 5, and the lower part is connected to the connecting telescopic plate 431.

[0091] The second lifting column 44 is arranged corresponding to the first lifting column 43 and is fixed on the left side of the fixed frame 41. The auxiliary slider and the second movable slider are arranged sequentially from top to bottom inside. The auxiliary slider is fixedly connected to the other end of the limiting rod 5, and the second movable slider is fixed with a control telescopic plate 441.

[0092] In other words, the fixed frame 41 achieves rolling friction connection with the test platform 1 through four adjusting rollers 42. By adjusting the rolling of the rollers 42, the fixed frame 41 is driven to rotate on the test platform 1, thereby adjusting the position of the lifting column. During the adjustment of the fixed frame 41, the limiting rod 5 and the auxiliary control mechanism 34 rotate at the top of the clamping and positioning device 3, thereby causing the first moving slider in the first lifting column 43 and the auxiliary slider in the second lifting column 44 to move synchronously, driving the limiting rod 5 and the upper rotating positioning rod 31 to move down, adjusting the position of the clamping cylinder 323 in the clamping assembly 32. After clamping the battery cell, it moves down again to connect the probe device 7 with the electrode post. The second lifting column 44 drives the lower probe device 7 to move and adjust through the second moving slider. When testing the cylindrical battery cell, the connecting telescopic plate 431 on the first moving slider extends to push the moving adjustment device 6 to extend to the clamping and positioning device 3. At the upper center of the first moving slider, the control telescopic plate 441 on the second moving slider extends to push the moving adjustment device 6 to the lower center of the clamping and positioning device 3, so that the upper and lower probe devices 7 correspond to each other. After the clamping assembly 32 fixes the cylindrical battery cell, the upper and lower probe devices 7 are connected to the cylindrical battery cell for testing. When testing the square battery cell, the connecting telescopic plate 431 on the first moving slider drives the end of the moving adjustment device 6 to move to the center of the clamping and positioning device 3. The control telescopic plate 441 on the second moving slider drives the moving adjustment device 6 to flip and move up to the same horizontal position as the first moving slider. The control telescopic plate 441 controls the end of the corresponding moving adjustment device 6 to fit with the end of the moving adjustment device 6 on the connecting telescopic plate 431. Then, the moving adjustment device 6 drives the probe device 7 to move and adjust respectively. After the clamping assembly 32 fixes the square battery cell, the probe device 7 moves down synchronously to achieve synchronous contact of the bipolar posts.

[0093] In this embodiment, there are two moving adjustment devices 6, which correspond to the connecting telescopic plate 431 and the control telescopic plate 441 respectively. The moving adjustment device 6 is fixedly connected to the connecting telescopic plate 431 and rotatably connected to the control telescopic plate 441. The moving adjustment device 6 includes a connecting slide rail 61 and an adjustment slider 62 slidably disposed on the connecting slide rail 61.

[0094] In other words, under the action of connecting telescopic plate 431 and controlling telescopic plate 441, the overall position of the moving adjustment device 6 is moved and adjusted. Under the action of adjusting slider 62, the probe device 7 is driven to move on connecting slide rail 61, so that the probe device 7 is accurately moved to the position of the cell electrode in the horizontal direction.

[0095] In this embodiment, the probe device 7 includes:

[0096] Connect the control base 71 and fix it on the movable adjustment device 6;

[0097] The central fixed circular surface 72 is fixed to the top center of the connecting control base 71;

[0098] The outer arc 73 is arranged in multiple groups in a ring, with multiple groups distributed outward from the center of each group.

[0099] The probe assembly 74 is movably disposed on the top of the central fixed circular surface 72 and the outer arc body 73, and the number of probe assemblies 74 on each outer arc body 73 increases from the center to the outside.

[0100] The adjustment ring assembly 75 is correspondingly disposed to the outer arc body 73 and fixed on the corresponding outer arc body 73, and the probe assembly 74 passes through the adjustment ring assembly 75.

[0101] In other words, when the probe device 7 moves toward the pole and connects with it, the pole contacts the adjusting ring assembly 75 according to the size of the pole, pushing the corresponding adjusting ring assembly 75 to contract and fit into the probe assembly 74, pushing the outer adjusting ring assembly 75 to move outward, and causing the corresponding outer arc body 73 and probe assembly 74 to move outward, ensuring that the corresponding probe assembly 74 is completely fitted with the pole, avoiding partial fitting that could lead to poor contact and accidents.

[0102] In this embodiment, the connection control base 71 includes:

[0103] A control groove 711 is provided corresponding to the outer arc 73 and is fixed on the top of the connecting control base 71, with the end of the control groove 711 facing the center.

[0104] A compression spring 712 is disposed within the control slot 711;

[0105] The connecting plate 713 is movably disposed within the control slot 711, near the center end, and its side is fixedly connected to the compression spring 712, while its top is fixedly connected to the top of the outer arc body 73.

[0106] In other words, when the pole pushes the adjusting ring assembly 75 outward, the corresponding outer arc body 73 moves outward synchronously, causing the connecting plate 713 to move within the control groove 711, compressing the compression spring 712. When the probe device 7 disengages from the pole, the compression spring 712 drives the outer arc body 73, the adjusting ring assembly 75, and the corresponding probe assembly 74 to reset via the connecting plate 713.

[0107] In this embodiment, the probe assembly 74 includes:

[0108] The needle 741 is positioned at the top of the outer arc body 73 and can move up and down.

[0109] An auxiliary spring 742 is sleeved on the needle 741 and located between the end of the needle 741 and the outer arc body 73.

[0110] In other words, the needle 741 provides stable contact pressure through the auxiliary spring 742 to ensure that it does not loosen during long-term testing.

[0111] In this embodiment, the adjusting ring assembly 75 includes:

[0112] The inner adjusting inclined ring 751 is a telescopic structure with an inclined surface at the top and a through hole running vertically through the inside. The bottom is fixedly connected to the connecting plate 713, and the through hole corresponds to the probe assembly 74.

[0113] The outer adjusting ring 752 is a telescopic structure, fixed to the outside of the inner adjusting inclined ring 751, and telescopically extends and retracts with the inner adjusting inclined ring 751. It is equipped with a control spring inside, and the stiffness of the control spring is greater than that of the compression spring 712.

[0114] In other words, when the probe device 7 is in contact with the pole, the edge of the pole corresponds to the inner adjusting inclined ring 751. Under continuous pressure, since the stiffness of the control spring is greater than that of the compression spring 712, the pole moves on the inclined surface of the inner adjusting inclined ring 751 and pushes the adjusting ring assembly 75 to move outward. Then, the outer arc body 73 moves outward synchronously, driving the connecting plate 713 to move in the control groove 711 and compressing the compression spring 712. If the edge of the pole corresponds to the outer adjusting ring 752, under continuous pressure, the pole pushes the outer adjusting ring 752 and the inner adjusting inclined ring 751 to contract, thereby exposing the probe assembly 74 and making the pole and the probe assembly 74 fit together.

[0115] In this embodiment, a method for using a lithium-ion battery cell charge-discharge cycle testing device is characterized by the following steps:

[0116] Step 1: Determine whether the battery cell is cylindrical or square. For cylindrical cells, testing is performed. The second movable slider in the second lifting column 44 moves the probe device 7 on the movable adjustment device 6 to the bearing plate 33 at the center of the lower rotating positioning rod 31 via the control telescopic plate 441. The telescopic plate 431 then moves the probe device 7 on the movable adjustment device 6 corresponding to the first lifting column 43 to the bottom center of the upper rotating positioning rod 31. With the upper and lower probe devices 7 aligned, the cylindrical battery cell is placed between the upper and lower probe devices 7. The test is then performed according to the battery cell specifications. The height is adjusted so that the upper probe device 7 moves down closer to the electrode post for testing the square battery cell. The lower probe device 7 moves up by the second sliding motion, and the moving adjustment device 6 is flipped by the control telescopic plate 441 so that the two moving adjustment devices 6 are on the same horizontal plane and their ends are attached to the bottom center of the upper rotating positioning rod 31. The square battery cell is placed on the support plate 33, and the sliding slider 62 moves on the connecting slide rail 61 to adjust the two probe devices 7 to the electrode post of the square battery cell. According to the height of the battery cell, the probe device 7 moves down closer to the electrode post.

[0117] Step 2: Next, the clamping component 32 in the clamping and positioning device 3 moves on the slide of the rotating positioning rod 31, and the rotating positioning rod 31 in the same group rotates in the opposite direction under the combined action of the driving mechanism and the auxiliary control mechanism 34 in the control circle 2, so as to drive the clamping component 32 to fix and clamp the side of the battery cell.

[0118] Step 3: Then, the first moving slider and the auxiliary slider drive the limit rod 5 to move down, causing the upper rotating positioning rod 31 and the probe device 7 to move down. The probe device 7 contacts the battery cell electrode. Under continuous pressure, if the edge of the electrode corresponds to the inner adjusting inclined ring 751, the electrode moves on the inclined surface of the inner adjusting inclined ring 751 and pushes the adjusting ring assembly 75 to move outward. Then, the outer arc body 73 moves outward synchronously, driving the connecting plate 713 to move in the control groove 711 and compressing the compression spring 712. If the edge of the electrode corresponds to the outer adjusting ring 752, the electrode pushes the outer adjusting ring 752 and the inner adjusting inclined ring 751 to contract, thus exposing the probe assembly 74, so that the electrode and the probe assembly 74 fit together, and the charging and discharging equipment charges the battery.

[0119] Step 4: After charging is complete, let the battery cell rest, then discharge it, and let it rest again after discharging. Repeat this charging → resting → discharging → resting cycle multiple times.

[0120] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lithium-ion battery cell charge-discharge cycle testing device, characterized in that: include: Test truncated cone (1), bearing cyclic test device; The control circular surface (2) is fixed at the center of the test circular platform (1) and has a drive mechanism inside; The clamping and positioning device (3) is rotatably mounted on the control circular surface (2), and its bottom center is connected to the internal drive mechanism of the control circular surface (2); A lifting and adjusting device (4) is installed on the test platform (1); Limiting rod (5); connected to the top of lifting adjustment device (4) and fixedly connected to the top of clamping positioning device (3); The movable adjustment device (6) is located inside the lifting adjustment device (4); The probe device (7) is fixed on the moving adjustment device (6), corresponds to the positive and negative poles of the battery cell, and is connected to the charging and discharging equipment.

2. The lithium-ion battery cell charge-discharge cycle testing device according to claim 1, characterized in that: The clamping and positioning device (3) includes: Two sets of rotating positioning rods (31) are symmetrically distributed in the upper and lower parts, with two rods in each set. The center of the lower rotating positioning rod (31) is connected to the drive mechanism inside the control circle (2). The two rotating positioning rods (31) in the same set rotate in opposite directions, and two symmetrically distributed slides are provided on each rotating positioning rod (31). The clamping assembly (32) is configured to correspond to the slide rail on the rotating positioning rod (31), and its upper and lower ends are respectively slidably configured on the slide rails of the upper and lower rotating positioning rods (31); The support plate (33) is set at the top center of the lower rotating positioning rod (31) and carries the battery cell; The auxiliary control mechanism (34) is fixed in the middle of the limit rod (5) and connected to the top center of the upper rotating positioning rod (31).

3. The lithium-ion battery cell charge-discharge cycle testing device according to claim 2, characterized in that: The clamping assembly (32) includes: Two active sliders (321) are symmetrically distributed vertically and are slidably set in the slides corresponding to the vertical rotating positioning rods (31); Two connecting columns (322) are symmetrically distributed vertically and fixed to the inner sides of the two active sliders (321); A clamping cylinder (323) is positioned between connecting cylinders (322) and has a diameter larger than the connecting cylinders (322) to clamp the battery cell; The telescopic shaft (324) is connected to both ends of the clamping cylinder (323) and the corresponding active slider (321). The limiting bushing (325) is fixed at both ends of the clamping cylinder (323) and located inside the connecting cylinder (322); A buffer spring (326) is sleeved on the telescopic shaft (324) and located inside the limiting bushing (325).

4. The lithium-ion battery cell charge-discharge cycle testing device according to claim 1, characterized in that: The lifting adjustment device (4) includes: The fixed frame (41) is set on the top of the test truncated cone (1) and is located outside the clamping and positioning device (3); Adjustment rollers (42) are arranged in a square shape, and are rotated at the four corners of the fixed frame (41) to fit against the side of the test platform (1); The first lifting column (43) is fixed on the right side of the fixed frame (41) and has a first movable slider inside. The upper part of the first movable slider is fixedly connected to one end of the limiting rod (5), and the lower part is connected to the connecting telescopic plate (431). The second lifting column (44) is set in correspondence with the first lifting column (43) and is fixed on the left side of the fixed frame (41). The auxiliary slider and the second moving slider are arranged in sequence from top to bottom inside. The auxiliary slider is fixedly connected to the other end of the limiting rod (5). The second moving slider is fixed with a control telescopic plate (441).

5. The lithium-ion battery cell charge-discharge cycle testing device according to claim 4, characterized in that: The movable adjustment device (6) has two parts, which correspond to the connecting telescopic plate (431) and the control telescopic plate (441) respectively. It is fixedly connected to the connecting telescopic plate (431) and rotatably connected to the control telescopic plate (441). The movable adjustment device (6) includes a connecting slide rail (61) and an adjustment slider (62) slidably disposed on the connecting slide rail (61).

6. The lithium-ion battery cell charge-discharge cycle testing device according to claim 1, characterized in that: The probe device (7) includes: Connect the control base (71) and fix it on the movable adjustment device (6); The central fixed circular surface (72) is fixed at the top center of the connecting control base (71); The outer arc (73) is provided with multiple groups in a ring-shaped distribution, and each group has multiple groups distributed from the center outwards. The probe assembly (74) is movable and set on the top of the central fixed circular surface (72) and the outer arc body (73), and the number of probe assemblies (74) on each outer arc body (73) increases from the center to the outside. The adjustment ring assembly (75) is correspondingly set to the outer arc body (73) and fixed on the corresponding outer arc body (73), and the probe assembly (74) passes through the adjustment ring assembly (75).

7. The lithium-ion battery cell charge-discharge cycle testing device according to claim 6, characterized in that: The connection control base (71) includes: A control groove (711) is provided corresponding to the outer arc body (73), and is fixed on the top of the connecting control base (71), with the end of the control groove (711) facing the center; A compression spring (712) is disposed in the control slot (711); The connecting plate (713) is movably disposed in the control slot (711) at one end near the center, and its side is fixedly connected to the compression spring (712), and its top is fixedly connected to the top of the outer arc body (73).

8. The lithium-ion battery cell charge-discharge cycle testing device according to claim 7, characterized in that: The probe assembly (74) includes: The needle (741) is positioned on the top of the outer arc (73) and moves up and down. An auxiliary spring (742) is fitted onto the needle (741) and located between the end of the needle (741) and the outer arc (73).

9. A lithium-ion battery cell charge-discharge cycle testing device according to claim 8, characterized in that: The regulating ring assembly (75) includes: The inner adjusting inclined ring (751) is a telescopic structure with an inclined surface at the top and a through hole running vertically through the inside. The bottom is fixedly connected to the connecting plate (713), and the through hole corresponds to the probe assembly (74). The outer adjusting ring (752) is a telescopic structure, fixed on the outside of the inner adjusting inclined ring (751), and telescopically extends and retracts with the inner adjusting inclined ring (751). It is equipped with a control spring inside, and the stiffness of the control spring is greater than that of the compression spring (712).

10. A method for testing the charge-discharge cycle of a lithium-ion battery cell, comprising using a lithium-ion battery cell charge-discharge cycle testing device as described in any one of claims 1-9, characterized in that, It includes the following steps: Step 1: Determine whether the battery cell is cylindrical or square. For cylindrical batteries, the second moving slider in the second lifting column (44) drives the probe device (7) on the moving adjustment device (6) to move to the upper support plate (33) at the center of the lower rotating positioning rod (31) via the control telescopic plate (441). The telescopic plate 431 moves the probe device (7) on the moving adjustment device (6) corresponding to the first lifting column (43) to the bottom center of the upper rotating positioning rod (31). The upper and lower probe devices (7) correspond to each other. The cylindrical battery cell is placed between the upper and lower probe devices (7). For square batteries, the second moving slider drives the lower probe device (7) to move upward and is rotated by the control telescopic plate (441) so that the two moving adjustment devices (6) are on the same horizontal plane. The square battery cell is placed on the support plate (33). The two probe devices (7) are moved and adjusted to the pole of the square battery cell. Step 2: Next, the clamping component 32 in the clamping and positioning device (3) moves on the slide of the rotating positioning rod (31), and the rotating positioning rod (31) rotates in the opposite direction, driving the clamping component (32) to fix and clamp the side of the battery cell. Step 3: Then, the first moving slider and the auxiliary slider drive the limiting rod (5) to move down, so that the upper rotating positioning rod (31) and the probe device (7) move down. The probe device (7) is connected to the battery cell terminal, and the charging and discharging equipment charges the battery cell at the terminal and the corresponding probe assembly (74) according to the terminal specifications. Step 4: After charging is complete, let the battery cell rest, then discharge it, and let it rest again after discharging. Repeat this charging → resting → discharging → resting cycle multiple times.

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