A lithium battery cell swelling force testing device

Abstract

The utility model relates to battery test technical field, and disclose a kind of lithium battery cell expansion force testing device, including workbench, workbench upper end surface is symmetrically provided with avoiding hole and sliding slot, sliding slot is provided with a pair, and it is located the left and right sides of avoiding hole, workbench upper end four corners are all fixedly connected with support column, and support column upper end is fixedly connected with top plate;Further comprising: clamping mechanism, clamping mechanism is installed on workbench upper end, and clamping mechanism is used to fix lithium battery cell;Scanning drive mechanism, scanning drive mechanism is installed on top plate lower end, and it is located just above clamping mechanism.The utility model drives driving rod rotation by self-locking motor drive, driving rod rotation drives connecting rod to move, connecting rod moves and drives connecting rod to move, to drive clamping seat to move, clamping seat moves and drives through spring and guide rod and drives clamping plate to move, clamping plate moves to reach the effect of clamping, to be able to adapt to different long, wide size square cell.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a lithium battery cell expansion force testing device. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the capacity of lithium-ion battery cells is constantly increasing. The expansion problem of cells during their cycle life is becoming increasingly prominent. Accurately obtaining expansion force and thickness data has become a prerequisite for the structural safety design and thermal runaway early warning of battery packs.

[0003] Patent CN221037770U discloses a lithium battery cell expansion force testing device, belonging to the field of battery testing technology. The device includes a top plate, a movable plate, a bottom plate, a fixed rod, a pressure sensor, a reflector, and a laser rangefinder. The top plate, movable plate, and bottom plate are arranged parallel to each other from top to bottom. The fixed rod passes through the top plate, movable plate, and bottom plate, and an elastic element connects the top plate and the movable plate. A pressure sensor is installed on the lower surface of the movable plate directly above the lithium battery placement slot. A reflector is installed on the upper surface of the movable plate, and a laser rangefinder is installed on the lower surface of the top plate directly above the reflector. When the lithium battery cell expands, the expansion force of the lithium battery cell is transmitted upwards, pushing the movable plate upwards, allowing the pressure sensor to receive the pressure, thus obtaining the battery expansion force. The upward movement of the movable plate allows for precise measurement of the cell thickness via the laser rangefinder and reflector. This device has a simple structure, is portable, and provides more accurate measurements.

[0004] However, the lithium battery placement slot in the above device has a fixed size and can only be compatible with a single specification of battery cell. Due to the large differences in the external dimensions of lithium-ion batteries in the current market, it is difficult for the same device to effectively clamp battery cells of different widths and lengths. This causes the battery cells to easily slip or tilt during the test, which in turn affects the accuracy of the expansion force and thickness data. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a lithium battery cell expansion force testing device to solve the problem that the fixed-size placement slot cannot be compatible with cells of different specifications, and the cells are prone to slippage and tilting during testing, resulting in distortion of expansion force and thickness data.

[0006] This utility model provides a lithium battery cell expansion force testing device, including a worktable. The upper surface of the worktable has symmetrically arranged clearance holes and sliding grooves on its front and back. A pair of sliding grooves are provided, located on the left and right sides of the clearance holes. Support columns are fixedly connected to the four corners of the upper surface of the worktable, and a top plate is fixedly connected to the upper end of each support column. The device also includes:

[0007] A clamping mechanism is mounted on the upper end of the worktable and is used to fix lithium battery cells.

[0008] A scanning drive mechanism is installed at the lower end of the top plate and is located directly above the clamping mechanism.

[0009] Preferably, a control box is fixedly connected to the upper end of the top plate, and a controller is installed inside the control box.

[0010] Preferably, the clamping mechanism includes a clamping seat, a pair of which are symmetrically arranged on the upper part of the worktable. Guide rods are slidably connected to the left and right sides of the clamping seat. A clamping plate is fixedly connected to the adjacent end of the front and rear guide rods. A spring is sleeved on the side wall of the guide rod between the clamping seat and the clamping plate. One end of the spring is fixedly connected to the clamping seat, and the other end of the spring is fixedly connected to the clamping plate. A slider and a connecting rod are fixedly connected to the lower end of the clamping seat. A pair of sliders are arranged on the left and right sides of the connecting rod. The sliders are located inside the slide groove and are slidably connected thereto. The lower end of the connecting rod passes through the clearance hole and is slidably connected thereto.

[0011] Preferably, a first laser rangefinder is fixedly connected inside the clamping plate, and its emitted beam is directed perpendicularly toward the surface of the clamping plate. The spring is a rectangular cross-section compression spring.

[0012] Preferably, the clamping mechanism further includes a drive assembly, which includes a self-locking motor. The drive motor is electrically connected to the controller via a wire. The self-locking motor is fixedly connected inside the worktable. A drive rod is fixedly connected to the output shaft end of the self-locking motor. Both ends of the drive rod are rotatably connected to connecting rods. The end of the connecting rod away from the drive rod is rotatably connected to the lower end of the connecting rod.

[0013] Preferably, the scanning drive mechanism includes a slide rail, a pair of which are fixedly connected to the front and rear sides of the lower end of the top plate. A first threaded rod is rotatably connected inside the slide rail, and the two first threaded rods are connected by a sprocket assembly. A first servo motor is fixedly connected to the right end of the slide rail located on the front side of the top plate. The first servo motor is electrically connected to a controller via a wire. The output shaft of the first servo motor is fixedly connected to the right end of the first threaded rod. A support frame is threadedly connected between the two first threaded rods. A sliding hole is provided on the upper surface of the support frame, and a mounting block is slidably connected inside the sliding hole. A second laser rangefinder is fixedly connected to the lower end of the mounting block, and its emitted beam is perpendicularly directed onto the worktable surface. A second threaded rod is rotatably connected to the upper end of the support frame via a bearing seat. The second threaded rod passes through the mounting block and is threadedly connected to it. A first servo motor is fixedly connected to the upper end of the support frame, and the output shaft of the first servo motor is fixedly connected to the rear end of the second threaded rod. The first servo motor is electrically connected to the controller via a wire.

[0014] Preferably, the upper end of the workbench is also provided with a charging mechanism, which includes a cylinder. The output shaft end of the cylinder is fixedly connected to a mounting plate, and the left end of the mounting plate is fixedly connected to a charging interface. The cylinder is electrically connected to the controller via a wire.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a self-locking motor to drive a drive rod to rotate, which in turn drives a connecting rod to move, which in turn drives a connecting rod to move, thereby moving a clamping seat. The movement of the clamping seat, in turn, drives a clamping plate to move via a spring and a guide rod, thus achieving a clamping effect. This allows it to accommodate square battery cells of different lengths and widths.

[0017] 2. This utility model integrates a first laser rangefinder inside the clamping plate to monitor the lateral displacement of the battery cell in real time. At the same time, a second laser rangefinder driven by XY bidirectional servo scanning performs a grid scan on the upper surface of the battery cell, which can obtain the full surface expansion profile at one time. With the expansion force-thickness coupling algorithm built into the controller, it can realize charging, data acquisition and correction at the same time, improve the testing efficiency, and eliminate the measurement distortion caused by the tilt of the battery cell in the traditional fixed slot structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0019] Figure 2 This is a top view of the clamping mechanism of this utility model;

[0020] Figure 3 This is a schematic diagram of the overall structure of the drive component of this utility model;

[0021] Figure 4 This is a schematic diagram of the overall structure of the scanning drive mechanism of this utility model.

[0022] Numbering on the map:

[0023] 1. Workbench; 11. Clearance Hole; 12. Slide Groove; 2. Support Column; 3. Top Plate; 4. Clamping Mechanism; 41. Clamping Seat; 411. Slider; 412. Connecting Rod; 42. Guide Rod; 43. Clamping Plate; 44. Spring; 45. First Laser Rangefinder; 46. Drive Assembly; 461. Self-Locking Motor; 462. Drive Rod; 463. Connecting Rod; 5. Scanning Drive Mechanism; 51. Slide Rail; 52. First Threaded Rod; 53. Support Frame; 531. Sliding Hole; 54. Second Threaded Rod; 55. Mounting Block; 56. Second Servo Motor; 57. Second Laser Rangefinder; 58. Sprocket Assembly; 59. Second Servo Motor; 6. Control Box; 7. Charging Mechanism; 71. Cylinder; 72. Mounting Plate; 73. Charging Interface. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-4 As shown, this utility model has the following three specific embodiments.

[0026] Example 1

[0027] A lithium battery cell expansion force testing device includes a worktable 1. The upper end of the worktable 1 has symmetrically arranged clearance holes 11 and sliding grooves 12. A pair of sliding grooves 12 are provided on the left and right sides of the clearance holes 11. Support columns 2 are fixedly connected to the four corners of the upper end of the worktable 1, and a top plate 3 is fixedly connected to the upper end of each support column 2. The device also includes:

[0028] Clamping mechanism 4 is installed on the upper end of worktable 1 and is used to fix lithium battery cells.

[0029] The scanning drive mechanism 5 is installed at the lower end of the top plate 3 and is located directly above the clamping mechanism 4.

[0030] A control box 6 is fixedly connected to the upper end of the top plate 3, and a controller is installed inside the control box 6;

[0031] The upper end of the workbench 1 is also equipped with a charging mechanism 7, which includes a cylinder 71. The output shaft end of the cylinder 71 is fixedly connected to a mounting plate 72, and the left end of the mounting plate 72 is fixedly connected to a charging interface 73. The cylinder 71 is electrically connected to the controller through a wire.

[0032] In this embodiment, as Figures 1-2As shown, the worktable 1 adopts a flat structure with clearance holes 11 and sliding grooves 12 on its upper surface. The sliding grooves 12 are symmetrically distributed on both sides of the clearance holes 11. The support columns 2 are vertically fixed at the four corners of the worktable 1, and the top plate 3 is horizontally mounted above the support columns 2, forming a stable frame structure. The clamping mechanism 4 is located at the upper end of the worktable 1 and is connected to the sliding grooves 12 through a sliding fit. The clamping mechanism 4 can clamp and position the lithium battery cells. The clamping process is stable and reliable, and it is suitable for fixing cells of different sizes. The scanning drive mechanism 5 is installed at the lower end of the top plate 3, located above the clamping mechanism 4, and has the following functions: The bidirectional movement function allows the ranging component to move flexibly in the horizontal plane, facilitating multi-point detection of the battery cell surface and improving detection efficiency and accuracy. The control box 6 is fixed to the top of the top plate 3 and contains a controller for centralized control of the actions of each mechanism to achieve coordinated operation. The charging mechanism 7 is located on one side of the upper end of the workbench 1. The cylinder 71 drives the mounting plate 72 to move the charging interface 73 close to the battery cell terminal. After docking, the battery cell can be continuously powered to meet the charging needs during the test. The overall structure is compact and easy to operate, and it is suitable for expansion force testing scenarios of various battery cell specifications.

[0033] Example 2

[0034] The difference from Embodiment 1 is that this embodiment discloses a clamping mechanism 4 for fixing lithium battery cells;

[0035] The clamping mechanism 4 includes a clamping seat 41. A pair of clamping seats 41 are symmetrically arranged on the upper end of the worktable 1. Guide rods 42 are slidably connected to the left and right sides of the clamping seat 41. A clamping plate 43 is fixedly connected to the adjacent end of the front and rear guide rods 42. A spring 44 is sleeved on the side wall of the guide rod 42 between the clamping seat 41 and the clamping plate 43. One end of the spring 44 is fixedly connected to the clamping seat 41, and the other end of the spring 44 is fixedly connected to the clamping plate 43. A slider 411 and a connecting rod 412 are fixedly connected to the lower end of the clamping seat 41. A pair of sliders 411 are arranged on the left and right sides of the connecting rod 412. The sliders 411 are located inside the slide groove 12 and are slidably connected to it. The lower end of the connecting rod 412 passes through the clearance hole 11 and is slidably connected to it.

[0036] A first laser rangefinder 45 is fixedly connected inside the clamping plate 43, and its emitted beam is perpendicularly directed toward the surface of the clamping plate 43. The spring 44 is a rectangular cross-section compression spring 44.

[0037] The clamping mechanism 4 also includes a drive assembly 46, which includes a self-locking motor 461. The drive motor is electrically connected to the controller via wires. The self-locking motor 461 is fixedly connected inside the worktable 1. A drive rod 462 is fixedly connected to the output shaft end of the self-locking motor 461. Both ends of the drive rod 462 are rotatably connected to connecting rods 463. The end of the connecting rod 463 away from the drive rod 462 is rotatably connected to the lower end of the connecting rod 412.

[0038] In this embodiment, as Figures 2-3 As shown, the guide rod 42 passes through the left and right side walls of the clamping seat 41, and a limiting ring is provided at the outer end to prevent it from coming off. A rectangular compression spring 44 is sleeved on the outer circumference of the guide rod 42, and its two ends are fixed in the clamping seat 41 and the clamping plate 43 respectively, forming a pre-compression state, which can provide a gentle thrust at the moment of clamping and avoid deformation of the battery cell edge due to concentrated load. The first laser rangefinder 45 is hidden in the inner wall of the clamping plate 43, its window is flush with the inner side of the clamping plate 43, and the beam direction is perpendicular to the clamping plate 43, providing real-time feedback on the change in the distance between the clamping plates 43. The self-locking motor 461 is horizontally placed in the inner cavity of the worktable 1, and the drive rod 462 is fixed in the center at the end of the motor shaft. The connecting rods 463 at both ends are hinged to form a double rocker structure. After the motor is powered on, the rotation angle of the drive rod 462 is limited by the controller, and the connecting rods 463 push and pull the connecting rods 412 on both sides in sync, so that the two clamping seats 41 slide towards each other or away from each other in the slide groove 12 to realize the clamping and releasing action. After the power is cut off, the motor self-locks, and the clamping force remains constant, without the need for additional braking elements.

[0039] Example 3

[0040] The difference from Embodiment 2 is that this embodiment discloses a scanning drive mechanism 5 at the lower end of the top plate 3;

[0041] The scanning drive mechanism 5 includes a slide rail 51. A pair of slide rails 51 are fixedly connected to the front and rear sides of the lower end of the top plate 3. A first threaded rod 52 is rotatably connected inside the slide rail 51. The two first threaded rods 52 are connected by a sprocket assembly 58. A first servo motor is fixedly connected to the right end of the slide rail 51 located on the front side of the top plate 3. The first servo motor is electrically connected to the controller via wires. The output shaft end of the first servo motor is fixedly connected to the right end of the first threaded rod 52. A support frame 53 is threadedly connected between the two first threaded rods 52 to support... A sliding hole 531 is provided on the upper surface of the support frame 53. A mounting block 55 is slidably connected inside the sliding hole 531. A second laser rangefinder 57 is fixedly connected to the lower end of the mounting block 55. Its emitted beam is directed perpendicularly to the surface of the worktable 1. A second threaded rod 54 is rotatably connected to the upper end of the support frame 53 through a bearing seat. The second threaded rod 54 passes through the mounting block 55 and is threadedly connected to it. A first servo motor is fixedly connected to the upper end of the support frame 53. The output shaft end of the first servo motor is fixedly connected to the rear end of the second threaded rod 54. The first servo motor is electrically connected to the controller through a wire.

[0042] In this embodiment, as Figure 4As shown, two slide rails 51 are suspended parallel to each other on the lower end face of the top plate 3, forming a longitudinal track spanning the clamping area; the first threaded rod 52 is hidden in the hollow cavity of the slide rail 51, and the rod end is coaxially locked with the sprocket, with the chain encircling it. After the first servo motor is powered on, the front and rear first threaded rods 52 rotate synchronously. The two ends of the support frame 53 are threadedly connected to the first threaded rods 52, converting the rotation into translation, realizing overall longitudinal guidance, with no crawling and no backlash during the movement; the second threaded rod 54 is located above the sliding hole 531 and mates with the inner threaded sleeve of the mounting block 55; the second servo motor 59 The second servo motor 5956 is mounted horizontally at the tail end of the support frame 53. The housing of the second servo motor 5956 is attached to the end face of the support frame 53 and reinforced with ribs. The shaft of the second servo motor 5956 is directly connected to the second threaded rod 54 through an elastic coupling to eliminate eccentric impact. After the second servo motor 5956 is powered on, the second threaded rod 54 drives the mounting block 55 to move laterally along the sliding hole 531. The second laser rangefinder 57 scans accordingly, and the beam is always perpendicular to the worktable 1, realizing grid sampling in both longitudinal and transverse directions, covering the entire upper surface of the cell, and providing high-density spatial information for the expansion morphology.

[0043] The working principle of this utility model is as follows:

[0044] The controller first causes the self-locking motor 461 to rotate, and the connecting rods 463 at both ends of the drive rod 462 to open outwards at the same time. The two clamping seats 41 slide back and forth along the slide groove 12 to the maximum opening. The battery cell to be tested is placed between the two clamping plates 43. The motor reverses, the connecting rods 463 retract inwards, the clamping seats 41 close together, and the rectangular spring 44 automatically compresses and applies force evenly according to the width of the battery cell until the distance value fed back by the first laser rangefinder 45 reaches the preset range. The motor is then de-energized and self-locked, completing the stepless clamping.

[0045] Under the command of the controller, the piston of cylinder 71 extends forward, and the mounting plate 72 carries the charging interface 73 forward to elastically press against the battery cell terminal to form a continuous power supply path. Throughout the test, the charging interface 73 floats and follows to compensate for changes in battery cell thickness and avoids loose connections.

[0046] The first servo motor synchronously drives the two first threaded rods 52 to rotate via a sprocket, causing the support frame 53 to move longitudinally along the slide rail 51. At the same time, the second servo motor 5956 drives the second threaded rod 54 to rotate, and the mounting block 55 carries the second laser rangefinder 57 to move laterally within the sliding hole 531, forming a grid scanning trajectory. The second laser rangefinder 57 collects the height of each point on the surface of the battery cell in real time to obtain the expansion profile. The first laser rangefinder 45 in the clamping plate 43 synchronously records the lateral displacement of the battery cell. All data is transmitted back to the controller, and after algorithm coupling, the expansion force-thickness curve is output, realizing integrated testing of charging, scanning, and analysis at the same time.

[0047] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A lithium battery cell expansion force testing device, comprising a worktable (1), characterized in that, The workbench (1) has symmetrical clearance holes (11) and slide grooves (12) on the front and back of its upper end. A pair of slide grooves (12) are provided, located on the left and right sides of the clearance holes (11). Support columns (2) are fixedly connected to the four corners of the upper end of the workbench (1), and a top plate (3) is fixedly connected to the upper end of each support column (2). The workbench (1) also includes: Clamping mechanism (4), which is installed on the upper end of the workbench (1), is used to fix the lithium battery cell; The scanning drive mechanism (5) is installed at the lower end of the top plate (3) and is located directly above the clamping mechanism (4).

2. The lithium battery cell expansion force testing device according to claim 1, characterized in that, A control box (6) is fixedly connected to the upper end of the top plate (3), and a controller is installed inside the control box (6).

3. The lithium battery cell expansion force testing device according to claim 1, characterized in that, The clamping mechanism (4) includes a clamping seat (41). A pair of clamping seats (41) are symmetrically arranged on the upper end of the workbench (1). Guide rods (42) are slidably connected to the left and right sides of the clamping seat (41). A clamping plate (43) is fixedly connected to the adjacent end of the front and rear guide rods (42). A spring (44) is sleeved on the side wall of the guide rod (42) between the clamping seat (41) and the clamping plate (43). One end of the spring (44) is fixedly connected to the clamping seat (41), and the other end of the spring (44) is fixedly connected to the clamping plate (43). A slider (411) and a connecting rod (412) are fixedly connected to the lower end of the clamping seat (41). A pair of sliders (411) are arranged on the left and right sides of the connecting rod (412). The sliders (411) are located inside the slide groove (12) and are slidably connected thereto. The lower end of the connecting rod (412) passes through the clearance hole (11) and is slidably connected thereto.

4. The lithium battery cell expansion force testing device according to claim 3, characterized in that, The clamp (43) is fixedly connected to a first laser rangefinder (45), whose emitted beam is directed perpendicularly to the surface of the clamp (43). The spring (44) is a rectangular cross-section compression spring (44).

5. The lithium battery cell expansion force testing device according to claim 1, characterized in that, The clamping mechanism (4) also includes a drive assembly (46), which includes a self-locking motor (461). The self-locking motor (461) is electrically connected to the controller via a wire. The self-locking motor (461) is fixedly connected inside the workbench (1). A drive rod (462) is fixedly connected to the output shaft end of the self-locking motor (461). Both ends of the drive rod (462) are rotatably connected to connecting rods (463). The end of the connecting rod (463) away from the drive rod (462) is rotatably connected to the lower end of the connecting rod (412).

6. The lithium battery cell expansion force testing device according to claim 1, characterized in that, The scanning drive mechanism (5) includes a slide rail (51), which has a pair and is fixedly connected to the front and rear sides of the lower end of the top plate (3). A first threaded rod (52) is rotatably connected inside the slide rail (51). The two first threaded rods (52) are connected by a sprocket assembly (58). A first servo motor (59) is fixedly connected to the right end of the slide rail (51) located on the front side of the top plate (3). The first servo motor (59) is electrically connected to the controller via a wire. The output shaft end of the first servo motor (59) is fixedly connected to the right end of the first threaded rod (52). A support frame (53) is threadedly connected between the two first threaded rods (52). A sliding hole (531) is provided on the upper surface of the support frame (53). A mounting block (55) is slidably connected inside the sliding hole (531). A second laser rangefinder (57) is fixedly connected to the lower end of the mounting block (55). Its emitted beam is directed perpendicularly to the surface of the worktable (1). A second threaded rod (54) is rotatably connected to the upper end of the support frame (53) through a bearing seat. The second threaded rod (54) passes through the mounting block (55) and is threadedly connected to it. A second servo motor (56) is fixedly connected to the upper end of the support frame (53). The output shaft end of the second servo motor (56) is fixedly connected to the rear end of the second threaded rod (54). The second servo motor (56) is electrically connected to the controller through a wire.

7. The lithium battery cell expansion force testing device according to claim 1, characterized in that, The upper end of the workbench (1) is also provided with a charging mechanism (7), which includes a cylinder (71). The output shaft end of the cylinder (71) is fixedly connected to a mounting plate (72), and the left end of the mounting plate (72) is fixedly connected to a charging interface (73). The cylinder (71) is electrically connected to the controller through a wire.

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