Battery cell detection device and detection method

Abstract

The application relates to the technical field of battery core detection, and discloses a battery core detection device and a detection method, which comprise a detection bin and a detection probe arranged on the inner side of the top of the detection bin. Two left rollers and right rollers are arranged in parallel in the detection bin, and each of the left roller and the right roller is provided with a moving frame. The first driving device is used for driving the left roller and the right roller to rotate synchronously, the transmission mechanism at the end of the right roller is used for adjusting the speed, the transmission mechanism of the right roller is faster than that of the left roller, the second driving device is used for adjusting the front and back of the battery core and the vertical body position in cooperation with the first driving device, the steering mechanism for adjusting the detection direction of the vertical body position of the battery core is arranged on the moving frame in cooperation with the second driving device, the front and back of the battery core and the vertical body position can be comprehensively detected, the detection process is completely automatic, the detection efficiency of the battery core is improved, and the problem that the front and back and the vertical body position cannot be comprehensively detected in the prior art is solved.

Description

Technical Field

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

[0002] A battery cell is the basic component of a battery; it is a device for storing and releasing electrical energy generated by the battery's electrochemical reaction. A battery cell consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The battery cell generates electrical energy through the flow of electrons and ions between the anode and cathode. If wrinkles, bubbles, exposed areas, defects, or small foreign objects are present in the battery cell during the manufacturing process, they can easily lead to dangerous accidents after being put into use; therefore, surface defect inspection is essential.

[0003] A search revealed that CN111060529A discloses a defect detection device and method for hydrogen fuel cell chips. Its vacuum platform can upright the battery chip, facilitating subsequent image acquisition and reducing detection errors. A flipping mechanism can flip the battery chip, thereby detecting defects on both the front and back sides. An image acquisition device scans the battery chip, and then the image information is compared with defect-free images to detect defects. The entire detection process is simple, the equipment structure is simple, and the operation is convenient. The detection efficiency is high; furthermore, the judgment criteria are consistent, and the detection results have good stability and small errors.

[0004] However, the aforementioned testing equipment still has the following problems: The testing equipment flips the battery chip using a flipping mechanism, thereby scanning the front and back of the battery chip with an image acquisition device. Then, it compares the image information with the defect-free image information to detect the defects on the front and back of the battery chip. Since the battery chip is usually sheet-like, its pressure resistance is weak, and it is very easy to bend under external force. The aforementioned testing equipment achieves the flipping of the front and back through the flipping mechanism, but it cannot take into account the comprehensive detection of the front and back as well as the vertical position, making it difficult to detect the defect. The existing detection method is to manually flip the battery cell to the vertical position and subjectively judge whether the battery chip is bent, which makes the detection efficiency low and human error large. Summary of the Invention

[0005] This invention proposes a battery cell testing device and method, which solves the problem that the existing technology cannot take into account the comprehensive testing of the front and back, as well as the vertical position.

[0006] The technical solution of the present invention is as follows: A battery cell testing device includes a testing chamber and a testing probe installed on the inner side of the top of the testing chamber. The testing chamber is provided with two parallel left rollers and right rollers. Each of the left rollers and right rollers is provided with a movable frame, and each of the left rollers and right rollers is rotatably arranged with the movable frame. The two movable frames are elastically connected by a first spring. The inner side of the testing chamber is symmetrically fixed with guide rails for sliding guidance of the two movable frames. Each of the left rollers and right rollers is radially provided with a first stop post, a second stop post, and a third stop post.

[0007] The detection chamber is equipped with a first drive device that drives the left and right rollers to rotate synchronously. The end of the right roller is equipped with a transmission mechanism that, driven by the first drive device, makes the right roller rotate faster than the left roller. The rotational speed ratio of the left and right rollers is 1:3. A second drive device is provided between the left and right rollers to adjust the orientation and vertical position of the battery cell in coordination with the first drive device. The moving frame is equipped with a steering mechanism that, in coordination with the second drive device, adjusts the vertical position and detection orientation of the battery cell.

[0008] Preferably, the movable frame includes a frame body, with slides symmetrically fixed on both sides of the bottom of the frame body. The slides are slidably connected to the guide rail inside the detection chamber, and the two ends of the first spring are respectively fixedly connected to the slides of the left roller and the right roller.

[0009] Preferably, both the first and second stop columns include a column body, which is fixed on the left roller. A sliding rod is slidably connected to the inner side of the outer end of the column body. The outer end of the sliding rod extends outward and is fixed with a pressure block. The pressure block is slidably connected to the column body through a second spring.

[0010] Preferably, the first driving device includes a frame and a first motor fixed inside the frame. The first motor is a dual-axis motor, and a first pulley is fixed at both output shaft ends. The first pulley is connected to a second pulley and a third pulley via a transmission belt. A left roller shaft is fixed on the second pulley. The left roller shaft is fixedly connected to a left roller and rotatably connected to a left slide.

[0011] Preferably, the transmission mechanism includes an end cover, which is rotatably connected to the right roller. A third pulley is fixed to the end cover and rotatably connected to a slide block. A right roller shaft is rotatably connected to the inner side of the third pulley and is fixed to the slide block. One end of the right roller shaft extends into the end cover and is fixed with a straight bracket. A first gear is rotatably connected to the center of the straight bracket. The first gear is fixedly connected to the right roller. A second gear and a third gear are provided on the outer side of the first gear. Both the second and third gears are rotatably connected to the straight bracket. The first gear meshes with the second gear, and the second gear meshes with the third gear. An annular toothed surface that meshes with the third gear is provided on the inner side of the end cover.

[0012] Preferably, the second driving device includes a fixed plate and a first electric telescopic rod fixed to the bottom of the fixed plate. The fixed plate is fixed inside the detection chamber, and the output end of the first electric telescopic rod is fixed to the frame.

[0013] Preferably, the steering mechanism includes a second electric telescopic rod, a bearing sleeve is rotatably connected to the second electric telescopic rod and the bearing sleeve is fixed to the frame, a pressure plate is fixed to the output end of the second electric telescopic rod, a second motor is fixed to the frame above the left roller, a fifth gear is fixed to the output shaft end of the second motor, and a fourth gear that meshes with the fifth gear is fixed to the outside of the second electric telescopic rod.

[0014] A method for testing battery cells includes the following steps:

[0015] Step 1: Inspection of the front position of the battery cell. Place the battery cell to be inspected face up between the left and right rollers, and support it with the third stop on the left and right rollers. The inspection probe is used to inspect the front of the battery cell for defects.

[0016] Step Two: The battery cell's front-facing position is changed to a vertical position. After the front-facing defect inspection of the battery cell is completed, the first motor is activated, driving the first pulley to rotate clockwise. The transmission belt then drives the second and third pulleys to rotate clockwise synchronously. During this process, the rotation of the left roller causes the battery cell to shift to the right, while simultaneously, the second stop on the left roller gradually presses down on the left end of the battery cell, causing the left end of the battery cell to tend downwards. The rotation of the right roller causes the battery cell to shift to the right, while simultaneously, the third stop on the right roller gradually presses down on the right end of the battery cell, causing the right end of the battery cell to tend upwards. That is, the battery cell rotates counterclockwise as a whole. At the same time, the first electric telescopic rod works synchronously to drive the height of the first pulley to decrease. Then, under the drag of the transmission belt, the distance between the left and right rollers is shortened, which helps to push the rotation of the battery cell. Under the speed adjustment of the transmission mechanism, the rotation speed of the right roller is three times that of the left roller. Therefore, when the second stop of the left roller rotates 90 degrees to press against the left side of the battery cell, the second stop of the right roller rotates 270 degrees to press against the right side of the battery cell. At this time, the battery cell is clamped and fixed by the first and second stopes on both sides and kept in a vertical position.

[0017] Step 3: Detection of the vertical position of the battery cell. The second electric telescopic rod above the left and right rollers works synchronously to drive the pressure plate to clamp the battery cell from both sides. Then, the first electric telescopic rod drives the first pulley to rise a short distance. Under the elastic force of the first spring, the left and right rollers move in opposite directions until the first and second stop columns disengage from the battery cell. Then, the second motor works to drive the battery cell to rotate in the vertical position. The detection probe performs a full-range detection of the vertical position of the rotating battery cell.

[0018] Step 4: Conversion of the battery cell from vertical to reverse position. After the vertical position inspection of the battery cell is completed, the first electric telescopic rod drives the first pulley to lower its height. This, in turn, causes the distance between the left and right rollers to shorten under the drag of the transmission belt, until the first and second stoppers clamp the battery cell again. Then, the second electric telescopic rod retracts the pressure plate and starts the first motor to continue working. The first stopper on the left roller pushes the lower half of the battery cell to the right, while the first stopper on the right roller rotates faster, pushing the upper half of the battery cell to the left through the pressure block. At the same time, the first electric telescopic rod begins to drive the first pulley to rise again, gradually increasing the distance between the left and right rollers. The entire battery cell rotates counterclockwise until it is in a reverse-facing position, where the inspection probe performs defect inspection on the reverse side of the battery cell.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. This invention drives the left and right rollers to rotate synchronously through a first driving device. The transmission mechanism at the end of the right roller adjusts the speed so that the right roller rotates faster than the transmission mechanism of the left roller. The second driving device, in conjunction with the first driving device, can adjust the orientation of the battery cell and its vertical position. A steering mechanism is set on the moving frame to adjust the vertical position detection orientation of the battery cell in conjunction with the second driving device. This enables comprehensive detection of the orientation of the battery cell and its vertical position, and the detection process is fully automated, improving the detection efficiency of the battery cell and solving the problem that the prior art cannot take into account the comprehensive detection of orientation and vertical position.

[0021] 2. The present invention provides a first stop post, a second stop post, and a third stop post on the left and right rollers, respectively. The first stop post is mainly used to support the battery cell in its initial state and keep the battery cell horizontal, while the second and third stop posts are mainly used to switch the battery cell between its forward and reverse positions and its vertical position, as well as to clamp and fix it in the vertical position. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of a battery cell testing device proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the structure of a battery cell testing device with the testing chamber removed, as proposed in this invention.

[0025] Figure 3 for Figure 2 A schematic diagram of the structure without the movable frame;

[0026] Figure 4 The present invention proposes Figure 2 A structural diagram excluding the front view of the movable frame;

[0027] Figure 5 This is a schematic diagram of the left roller rotating 90 degrees as proposed in this invention;

[0028] Figure 6 This is a partial cross-sectional schematic diagram of the transmission mechanism proposed in this invention;

[0029] Figure 7 This is a schematic diagram of the mobile frame structure proposed in this invention;

[0030] Figure 8 This is a schematic diagram showing the battery cell being supported by the third baffle proposed in this invention;

[0031] Figure 9 This is a schematic diagram showing the battery cell being clamped by the first and second baffles proposed in this invention.

[0032] In the diagram: 1. Detection chamber; 11. Guide rail; 2. Detection probe; 3. Left roller; 31. First stop post; 311. Column; 312. Slide rod; 313. Pressure block; 314. Second spring; 32. Second stop post; 33. Third stop post; 4. Right roller; 5. Moving frame; 51. Frame body; 52. Slide block; 53. Left roller shaft; 6. First spring; 7. First drive device; 71. Frame; 72. First motor; 73. First pulley; 74. Second pulley 75. Third pulley; 76. Transmission belt; 8. Second drive unit; 81. Fixing plate; 82. First electric telescopic rod; 9. Transmission mechanism; 91. End cover; 92. Right roller shaft; 93. Straight bracket; 94. First gear; 95. Second gear; 96. Third gear; 97. Annular tooth surface; 10. Steering mechanism; 101. Second electric telescopic rod; 102. Pressure plate; 103. Fourth gear; 104. Second motor; 105. Fifth gear. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 , Figure 2 and Figure 3 This invention provides a technical solution: a battery cell testing device, comprising a testing chamber 1 and a testing probe 2 installed on the inner side of the top of the testing chamber 1. The testing probe 2 can be an image acquisition and testing device from a comparison file, and the detected defects include one or more combinations of wrinkles, bubbles, exposed areas, defects, or small foreign objects on the surface of the battery cell. The testing chamber 1 is equipped with two parallel left rollers 3 and right rollers 4. Each of the left rollers 3 and right rollers 4 is equipped with a movable frame 5, and each of the left rollers 3 and right rollers 4 is rotatably mounted to the movable frame 5. The two movable frames 5 are elastically connected by a first spring 6. Figure 7 As shown, the movable frame 5 includes a frame body 51. Slide seats 52 are symmetrically fixed on both sides of the bottom of the frame body 51. The slide seats 52 are slidably connected to the guide rails 11 inside the detection chamber 1. The two ends of the first spring 6 are fixedly connected to the slide seats 52 of the left roller 3 and the right roller 4 respectively. The inner side of the detection chamber 1 is symmetrically fixed with guide rails 11 that guide the sliding of the two movable frames 5. The left roller 3 and the right roller 4 are both radially provided with a first stop post 31, a second stop post 32 and a third stop post 33.

[0035] Please see Figure 4 and Figure 5Both the first stop post 31 and the second stop post 32 include a post body 311. The post body 311 is fixed on the left roller 3 (the post body 311 of the first stop post 31 and the second stop post 32 on the right roller 4 is fixed on the right roller 4). The inner side of the outer end of the post body 311 is slidably connected to a slide rod 312. The outer end of the slide rod 312 extends to the outside of the slide rod 312 and is fixed with a pressure block 313. The pressure block 313 is slidably connected to the post body 311 through a second spring 314. The elastic force of the second spring 314 can prevent excessive pressure from damaging the battery cell. At the same time, it is suitable for clamping and fixing battery cells of different thicknesses within a reliable range.

[0036] Please see Figure 2 and Figure 3 The detection chamber 1 is equipped with a first drive device 7 that drives the left roller 3 and the right roller 4 to rotate synchronously. The first drive device 7 includes a frame 71 and a first motor 72 fixed in the frame 71. The first motor 72 is a dual-axis motor, and the two output shaft ends are fixed with first pulleys 73. The first pulleys 73 are connected to the second pulley 74 and the third pulley 75 through the transmission belt 76. The left roller shaft 53 is fixed on the second pulley 74. The left roller shaft 53 is fixedly connected to the left roller 3 and rotatably connected to the left side slide 52. The first motor 72 is a drive element that drives the left roller 3 and the right roller 4 to rotate synchronously, which can assist in the flipping of the battery cell.

[0037] Please see Figure 6 The right roller 4 is equipped with a transmission mechanism 9 at its end, which, driven by the first driving device 7, makes the right roller 4 rotate faster than the left roller 3. The transmission mechanism 9 includes an end cover 91, which is rotatably connected to the right roller 4. A third pulley 75 is fixed to the end cover 91 and is rotatably connected to the slide block 52. A right roller shaft 92 is rotatably connected to the inner side of the third pulley 75 and is fixed to the slide block 52. One end of the right roller shaft 92 extends into the end cover 91 and is fixed with a straight bracket 93. A first gear 94 is rotatably connected to the center of the straight bracket 93 and is fixedly connected to the right roller 4. A second gear 95 and a third gear 96 are provided on the outer side of the first gear 94. The second gear 95 and the third gear 96 are both connected to the straight bracket. The first gear 94 meshes with the second gear 95, and the second gear 95 meshes with the third gear 96. The inner side of the end cover 91 is provided with an annular toothed surface 97 that meshes with the third gear 96. When the third pulley 75 is driven to rotate clockwise by the transmission belt 76, the third gear 96 can be driven to rotate clockwise by the meshing of the annular toothed surface 97 with the third gear 96. The second gear 95 can be driven to rotate counterclockwise by the meshing of the third gear 96 with the second gear 95. The first gear 94 can be driven to rotate clockwise by the meshing of the second gear 95 with the first gear 94. That is, the left roller 3 and the right roller 4 rotate clockwise synchronously. By adjusting the transmission ratio between the gears, the rotational speed of the right roller 4 can be three times that of the left roller 3.

[0038] Please see Figure 3 and Figure 4 The rotational speed ratio between the left roller 3 and the right roller 4 is 1:3. A second drive device 8 is provided between the left roller 3 and the right roller 4 to adjust the orientation and vertical position of the battery cells in conjunction with the first drive device 7. The second drive device 8 includes a fixed plate 81 and a first electric telescopic rod 82 fixed to the bottom of the fixed plate 81. The fixed plate 81 is fixed inside the detection chamber 1. The output end of the first electric telescopic rod 82 is fixed to the frame 71. The first electric telescopic rod 82 can drive the height of the first pulley 73 to decrease, thereby shortening the distance between the left roller 3 and the right roller 4 under the drag of the transmission belt 76. Conversely, when the height of the first pulley 73 rises, the distance between the left roller 3 and the right roller 4 increases under the elastic force of the first spring 6.

[0039] Please see Figure 7 The mobile frame 5 is equipped with a steering mechanism 10 that works in conjunction with the second drive device 8 to adjust the vertical position detection orientation of the battery cell. The steering mechanism 10 includes a second electric telescopic rod 101, which is rotatably connected to a bearing sleeve and fixed to the frame 51. A pressure plate 102 is fixed to the output end of the second electric telescopic rod 101. A second motor 104 is fixed to the frame 51 above the left roller 3. A fifth gear 105 is fixed to the output shaft end of the second motor 104. A fourth gear 103 that meshes with the fifth gear 105 is fixed to the outside of the second electric telescopic rod 101. When the second electric telescopic rod 101 above the left roller 3 and the right roller 4 works synchronously, it can drive the pressure plate 102 to clamp the battery cell from both sides. When the second motor 104 works, it can drive the battery cell to rotate in a vertical position through the meshing of the fifth gear 105 and the fourth gear 103.

[0040] Based on the battery cell testing device proposed in this invention, this invention also proposes a battery cell testing method, which specifically includes the following steps:

[0041] Step 1: Detecting the front position of the battery cell. Place the battery cell to be tested face up between the left roller 3 and the right roller 4, supported by the third stop 33 on the left roller 3 and the right roller 4. At this time, the device... Figure 8 In the state shown, the front of the battery cell is inspected for defects using the detection probe 2;

[0042] Step Two: The battery cell's front-facing position is changed to a vertical position. After the front-facing defect inspection of the battery cell is completed, the first motor 72 is activated, driving the first pulley 73 to rotate clockwise. Under the transmission action of the drive belt 76, the second pulley 74 and the third pulley 75 rotate synchronously clockwise. During this process, the rotation of the left roller 3 causes the battery cell to shift to the right, while simultaneously the second stop 32 on the left roller 3 gradually presses down on the left end of the battery cell, causing the left end of the battery cell to tend downwards. The rotation of the right roller 4 causes the battery cell to shift to the right, while simultaneously the third stop 33 on the right roller 4 gradually presses down on the right end of the battery cell, causing the right end of the battery cell to tend upwards. That is, the battery cell... The battery core rotates counterclockwise. Simultaneously, the first electric telescopic rod 82 lowers the height of the first pulley 73, which, driven by the transmission belt 76, shortens the distance between the left roller 3 and the right roller 4, further assisting in the rotation of the battery core. Under the speed regulation of the transmission mechanism 9, the right roller 4 rotates three times faster than the left roller 3. Therefore, when the second stop post 32 of the left roller 3 rotates 90 degrees to press against the left side of the battery core, the second stop post 32 of the right roller 4 rotates 270 degrees to press against the right side of the battery core. At this time, the battery core is clamped and fixed in a vertical position by the first stop posts 31 and the second stop posts 32 on both sides. The device then... Figure 9 In the state shown;

[0043] Step 3: Detection of the vertical position of the battery cell. The second electric telescopic rod 101 above the left roller 3 and the right roller 4 works synchronously to drive the pressure plate 102 to clamp the battery cell from both sides. Then, the first electric telescopic rod 82 drives the first pulley 73 to rise a short distance. Under the elastic force of the first spring 6, the left roller 3 and the right roller 4 move in opposite directions until the first stop post 31 and the second stop post 32 disengage from the battery cell. Then, the second motor 104 works to drive the battery cell to rotate in the vertical position. The detection probe 2 performs an all-round detection of the vertical position of the rotating battery cell.

[0044] Step 4: Conversion of the battery cell from vertical to reverse position. After the vertical position inspection of the battery cell is completed, the first electric telescopic rod 82 drives the first pulley 73 to decrease in height. Then, under the drag of the transmission belt 76, the distance between the left roller 3 and the right roller 4 is shortened until the first stop post 31 and the second stop post 32 clamp the battery cell again. Then, the second electric telescopic rod 101 retracts the pressure plate 102 and starts the first motor 72 to continue working. The first stop post 31 on the left roller 3 pushes the lower half of the battery cell to the right, while the first stop post 31 on the right roller 4 rotates faster and pushes the upper half of the battery cell to the left through the pressure block 313. At the same time, the first electric telescopic rod 82 begins to drive the first pulley 73 to rise again, so that the distance between the left roller 3 and the right roller 4 gradually increases. The battery cell rotates counterclockwise until the battery cell is in a reverse-facing position. The detection probe 2 then performs defect detection on the reverse side of the battery cell.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 battery cell testing device, comprising a testing chamber (1) and a testing probe (2) installed on the inner side of the top of the testing chamber (1), characterized in that, The detection chamber (1) is provided with two parallel left rollers (3) and right rollers (4). Each of the left rollers (3) and right rollers (4) is provided with a movable frame (5), and each of the left rollers (3) and right rollers (4) is rotatably arranged with the movable frame (5). The two movable frames (5) are elastically connected by a first spring (6). The inner side of the detection chamber (1) is symmetrically fixed with guide rails (11) for sliding guidance of the two movable frames (5). Each of the left rollers (3) and right rollers (4) is radially provided with a first stop post (31), a second stop post (32) and a third stop post (33). The detection chamber (1) is equipped with a first drive device (7) that drives the left roller (3) and the right roller (4) to rotate synchronously. The end of the right roller (4) is equipped with a transmission mechanism (9) that makes the right roller (4) rotate faster than the left roller (3) under the drive of the first drive device (7). The speed ratio of the left roller (3) to the right roller (4) is 1:

3. A second drive device (8) is provided between the left roller (3) and the right roller (4) to adjust the front and back of the battery cell and its vertical position in cooperation with the first drive device (7). The moving frame (5) is equipped with a steering mechanism (10) that adjusts the vertical position detection orientation of the battery cell in cooperation with the second drive device (8).

2. The battery cell testing device according to claim 1, characterized in that, The mobile frame (5) includes a frame (51), and slides (52) are symmetrically fixed on both sides of the bottom of the frame (51). The slides (52) are slidably connected to the guide rail (11) in the detection chamber (1). The two ends of the first spring (6) are fixedly connected to the slides (52) of the left roller (3) and the right roller (4) respectively.

3. The battery cell testing device according to claim 1, characterized in that, Both the first stop (31) and the second stop (32) include a column (311). The column (311) is fixed on the left roller (3). A slide rod (312) is slidably connected to the inner side of the outer end of the column (311). The outer end of the slide rod (312) extends to the outside of the slide rod (312) and is fixed with a pressure block (313). The pressure block (313) is slidably connected to the column (311) through a second spring (314).

4. The battery cell testing device according to claim 1, characterized in that, The first drive device (7) includes a frame (71) and a first motor (72) fixed inside the frame (71). The first motor (72) is a dual-axis motor, and a first pulley (73) is fixed at both output shaft ends. The first pulley (73) is connected to a second pulley (74) and a third pulley (75) via a transmission belt (76). A left roller shaft (53) is fixed on the second pulley (74). The left roller shaft (53) is fixedly connected to the left roller (3), and the left roller shaft (53) is rotatably connected to the left slide (52).

5. A battery cell testing device according to claim 4, characterized in that, The transmission mechanism (9) includes an end cover (91), which is rotatably connected to the right roller (4). The third pulley (75) is fixed on the end cover (91) and rotatably connected to the slide (52). A right roller shaft (92) is rotatably connected to the inner side of the third pulley (75). The right roller shaft (92) is fixed on the slide (52). One end of the right roller shaft (92) extends into the end cover (91) and is fixed with a straight bracket (93). The center position of the straight bracket (93) is rotatably connected to... A first gear (94) is connected to the right roller (4). A second gear (95) and a third gear (96) are provided on the outside of the first gear (94). The second gear (95) and the third gear (96) are rotatably connected to the bracket (93). The first gear (94) meshes with the second gear (95), and the second gear (95) meshes with the third gear (96). The inner side of the end cover (91) is provided with an annular tooth surface (97) that meshes with the third gear (96).

6. The battery cell testing device according to claim 4, characterized in that, The second drive device (8) includes a fixed plate (81) and a first electric telescopic rod (82) fixed to the bottom of the fixed plate (81). The fixed plate (81) is fixed inside the detection chamber (1), and the output end of the first electric telescopic rod (82) is fixed to the frame (71).

7. The battery cell testing device according to claim 1, characterized in that, The steering mechanism (10) includes a second electric telescopic rod (101), which is rotatably connected to a bearing sleeve and fixed to the frame (51). The output end of the second electric telescopic rod (101) is fixed to a pressure plate (102). A second motor (104) is fixed on the frame (51) above the left roller (3). A fifth gear (105) is fixed to the output shaft end of the second motor (104). A fourth gear (103) that meshes with the fifth gear (105) is fixed to the outside of the second electric telescopic rod (101).

8. A method for detecting battery cells, comprising a battery cell detection device according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Inspection of the front position of the battery cell. Place the battery cell to be inspected face up between the left roller (3) and the right roller (4), and support it with the third stop (33) on the left roller (3) and the right roller (4). The front of the battery cell is inspected for defects by the inspection probe (2). Step Two: Conversion of the battery cell from a frontal to a vertical position. After the defect detection of the front of the battery cell is completed, the first motor (72) is turned on to drive the first pulley (73) to rotate clockwise. Under the transmission action of the transmission belt (76), the second pulley (74) and the third pulley (75) are driven to rotate clockwise synchronously. During this process, the rotation of the left roller (3) causes the battery cell to shift to the right, while at the same time, the second stop (32) on the left roller (3) gradually presses down on the left end of the battery cell, causing the left end of the battery cell to have a downward tendency. The rotation of the right roller (4) causes the battery cell to shift to the right, while at the same time, the third stop (33) on the right roller (4) gradually presses down on the right end of the battery cell, causing the right end of the battery cell to have an upward tendency, that is, the battery cell is rotated to the right. The battery core rotates counterclockwise. At the same time, the first electric telescopic rod (82) works synchronously to drive the height of the first pulley (73) to drop. Then, under the drag of the transmission belt (76), the distance between the left roller (3) and the right roller (4) is shortened, which helps to push the rotation of the battery core. Under the speed regulation of the transmission mechanism (9), the rotation speed of the right roller (4) is 3 times that of the left roller (3). Therefore, when the second stop post (32) of the left roller (3) rotates 90 degrees to press against the left side of the battery core, the second stop post (32) of the right roller (4) rotates 270 degrees to press against the right side of the battery core. At this time, the battery core is clamped and fixed by the first stop post (31) and the second stop post (32) on both sides and kept in a vertical position. Step 3: Detection of the vertical position of the battery cell. The second electric telescopic rod (101) above the left roller (3) and the right roller (4) works synchronously to drive the pressure plate (102) to clamp the battery cell from both sides. Then, the first electric telescopic rod (82) drives the first pulley (73) to rise a short distance. Under the elastic force of the first spring (6), the left roller (3) and the right roller (4) move in opposite directions until the first stop (31) and the second stop (32) are separated from the battery cell. Then, the second motor (104) works to drive the battery cell to rotate in the vertical position. The vertical position of the rotating battery cell is detected from all directions by the detection probe (2). Step 4: Converting the battery cell from vertical to reverse position. After the vertical position detection of the battery cell is completed, the height of the first pulley (73) is lowered by the first electric telescopic rod (82). Then, under the drag of the transmission belt (76), the distance between the left roller (3) and the right roller (4) is shortened until the first stop post (31) and the second stop post (32) clamp the battery cell again. Then, the second electric telescopic rod (101) retracts the pressure plate (102), and the first motor (72) is turned on to continue working. The first roller (3) on the left roller (3)... A stop column (31) pushes the lower half of the battery cell to the right, while the first stop column (31) on the right roller (4) rotates faster and pushes the upper half of the battery cell to the left through the pressure block (313). At the same time, the first electric telescopic rod (82) begins to drive the height of the first pulley (73) to rise, so that the distance between the left roller (3) and the right roller (4) gradually increases, and the battery cell rotates counterclockwise until the battery cell is kept in the position of reverse side facing up. The detection probe (2) performs defect detection on the reverse side of the battery cell.

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