Battery pole piece flexibility testing device

Abstract

The utility model discloses a battery pole piece flexibility testing device which comprises a conveying device, a receiving device, a first supporting device, a second supporting device and a lifting device, one end of a pole piece is connected with the conveying device, and the other end of the pole piece sequentially penetrates through the first supporting device and the second supporting device and then is connected with the receiving device. The conveying device is used for pushing the pole piece in the direction close to the receiving device, so that the test part of the pole piece is positioned between the first supporting device and the second supporting device; the lifting device comprises a lifting driving assembly and a bending shaft body, the radial size of the bending shaft body is adjustable, the bending shaft body is installed at the driving end of the lifting driving assembly, and the lifting driving assembly is used for driving the bending shaft body to move in the direction perpendicular to the pole piece, so that the bending shaft body bends the test part of the pole piece. The battery pole piece flexibility testing device can carry out accurate and comprehensive quantitative test on the flexibility of the pole piece, and is beneficial to improving the accuracy and efficiency of evaluating the flexibility of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pole piece flexibility testing, in particular to a battery pole piece flexibility testing device. Background Art

[0002] With the increasingly serious new energy crisis and the strong guidance of national policies, electric vehicles have become the main trend of future automotive industry development. As an important component of electric vehicles, power batteries have the highest installed capacity in the electric vehicle field due to their advantages such as small size, high energy density and green environmental protection. As various companies vigorously develop high-power power batteries, the performance of power batteries has also received widespread attention.

[0003] In the production and manufacturing process of power batteries, the flexibility of the battery pole piece is an important parameter to measure the battery performance and directly affects the battery life. Therefore, accurate evaluation of the flexibility of the pole piece is a key link in the production and manufacturing process of power batteries.

[0004] There are two existing methods for evaluating the flexibility of battery electrodes. One is to fold the rolled electrode 180 degrees and observe whether there are any broken pieces that are light-transmitting after the fold. The other is to wrap the electrode around cylindrical needles of different diameters for traction and friction, and observe the material shedding at different diameters.

[0005] The above two methods for evaluating the flexibility of the electrode are both based on manual observation and empirical judgment to evaluate the flexibility of the electrode. Subjective factors have a great influence and cannot be accurately quantified, resulting in a lack of objectivity in the evaluation of the flexibility of the electrode. The evaluation results cannot accurately reflect the true flexibility of the electrode. If a misjudgment occurs, it will seriously affect the performance and service life of the battery. In addition, the evaluation operation process is complicated and time-consuming, which is not conducive to rapid detection in the large-scale production of battery electrodes. Utility Model Content

[0006] The purpose of the utility model is to provide a battery pole piece flexibility testing device, which can perform accurate and comprehensive quantitative testing on the flexibility of the pole piece, which is beneficial to improving the accuracy and efficiency of evaluating the flexibility of the pole piece. The test steps are simple and suitable for rapid detection of pole pieces during large-scale production, which is beneficial to improving the efficiency of battery production as well as the performance and service life of the battery.

[0007] In order to achieve the above-mentioned purpose, the utility model discloses a battery pole piece flexibility testing device, which includes: a conveying device, a receiving device, a first supporting device, a second supporting device and a lifting device, wherein the first supporting device and the second supporting device are arranged between the conveying device and the receiving device, one end of the pole piece is connected to the conveying device, and the other end passes through the first supporting device and the second supporting device in sequence and then is connected to the receiving device, the conveying device is used to push the pole piece in a direction close to the receiving device so that the testing part of the pole piece is between the first supporting device and the second supporting device; the lifting device includes a lifting drive assembly and a bending shaft body, the radial size of the bending shaft body is adjustable, the bending shaft body is installed at the driving end of the lifting drive assembly, and the lifting drive assembly is used to drive the bending shaft body to move in a direction perpendicular to the pole piece so that the bending shaft body bends the testing part of the pole piece.

[0008] Optionally, a connecting shaft is provided at the driving end of the lifting drive assembly, and the bending shaft body is roller-shaped and detachably mounted on the connecting shaft.

[0009] Optionally, the lifting device includes a visual sensor, and the visual sensor and the bending axis are respectively arranged on both sides of the test part of the pole piece in the vertical direction. The visual sensor is provided with a sensing end, and the sensing end faces the test part of the pole piece. The visual sensor is used to detect and record the fracture of the test part of the pole piece.

[0010] Optionally, the visual sensor is arranged below the bending shaft, and the sensing end is arranged upward. The bending shaft is driven by the lifting drive assembly to bend the test portion of the pole piece downward until the test portion of the pole piece breaks.

[0011] Optionally, the first supporting device and the second supporting device are both provided with a transmission shaft assembly and a correction sensor, the transmission shaft assembly includes a first transmission shaft, a second transmission shaft and two transmission brackets, the first transmission shaft and / or the second transmission shaft can be movably arranged on the transmission bracket parallel to the pole piece, the correction sensor is used to detect the position of the pole piece, the correction sensor is connected to the transmission shaft assembly, the transmission shaft assembly is used to control the rolling of the first transmission shaft and the second transmission shaft to drive the pole piece, and is used to control the first transmission shaft and / or the second transmission shaft to correct the position of the pole piece transmission according to the detection of the correction sensor.

[0012] Optionally, the first supporting device and the second supporting device both include a partition plate and two transmission shaft assemblies, the partition plate is provided with a transmission gap, and the two transmission shaft assemblies are fixedly connected to the two sides of the partition plate corresponding to the transmission gap, so that the pole piece passes through one transmission shaft assembly, the transmission gap and the other transmission shaft assembly in sequence.

[0013] Optionally, the conveying device is provided with a roll-feeding assembly, and the receiving device is provided with a roll-reeling assembly, and the roll-feeding assembly and the roll-reeling assembly both include a device bracket, a drive, a driving wheel, a passive wheel and a connecting belt arranged on the device bracket, the driving wheel is installed on the driving end of the drive, the passive wheel includes a connecting part and a roller part, the roller part is connected to the pole piece, the connecting belt is wound between the driving wheel and the connecting part, and the driver is used to drive the driving wheel to rotate so as to drive the roller part to rotate through the connecting belt and the connecting part.

[0014] Optionally, the conveying device includes a winding assembly and a tension assembly, the winding assembly is provided with an unwinding roller and a brake, the unwinding roller is connected to a pole piece, the winding assembly is used to control the rotation of the unwinding roller to push the pole piece toward the first supporting device, the tension assembly is arranged between the winding assembly and the first supporting device, the tension assembly includes a tension detector and a tension controller, the tension detector is in contact with the pole piece and is used to detect the tension of the pole piece, the tension controller is connected to the tension detector and the brake, and the tension controller is used to adjust the unwinding resistance formed by the unwinding roller under the action of the brake according to the detection of the tension detector.

[0015] Optionally, the tension assembly includes a first roller, a second roller, and the tension detector arranged between the first roller and the second roller, the arrangement height of the lower tangent lines of the first roller and the second roller is smaller than the arrangement height of the upper tangent line of the tension detector, and the pole piece contacts the upper side of the first roller, the lower side of the tension detector, and the upper side of the second roller in sequence.

[0016] The utility model is provided with a lifting device to bend the pole piece, and cooperates with a conveying device and a receiving device to unfold the pole piece, and a first supporting device and a second supporting device are also provided between the conveying device and the receiving device. The pole piece starts from the conveying device, passes through the first supporting device and the second supporting device in sequence, and is connected to the receiving device. The conveying device is used to push the pole piece so that the test part of the pole piece is between the first supporting device and the second supporting device. The lifting drive assembly of the lifting device is used to drive the bending shaft to move in a direction perpendicular to the pole piece to bend the test part of the pole piece until the pole piece breaks. By judging the distance moved by the bending shaft when the pole piece breaks, and cooperating with the adjustable radial size of the bending shaft, the flexibility of the pole piece can be accurately and comprehensively quantitatively tested, which is conducive to improving the accuracy and efficiency of evaluating the flexibility of the pole piece, and the test steps are simple, which is suitable for rapid detection of the pole piece during large-scale production, thereby helping to improve the efficiency of battery production and the performance and service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a battery pole piece flexibility testing device according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the conveying device in the battery pole piece flexibility testing device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0020] See also Figure 1 and Figure 2 The utility model discloses a battery pole piece flexibility testing device, which includes: a conveying device 1, a receiving device 2, a first supporting device 3, a second supporting device 4 and a lifting device 5, wherein the first supporting device 3 and the second supporting device 4 are arranged between the conveying device 1 and the receiving device 2, one end of the pole piece 100 is connected to the conveying device 1, and the other end passes through the first supporting device 3 and the second supporting device 4 in sequence and then is connected to the receiving device 2, the conveying device 1 is used to push the pole piece 100 in a direction close to the receiving device 2, so that the testing part of the pole piece 100 is between the first supporting device 3 and the second supporting device 4; the lifting device 5 includes a lifting drive assembly 51 and a bending shaft body 52, the radial size of the bending shaft body 52 is adjustable, the bending shaft body 52 is installed at the driving end of the lifting drive assembly 51, and the lifting drive assembly 51 is used to drive the bending shaft body 52 to move in a direction perpendicular to the pole piece 100, so that the bending shaft body 52 bends the testing part of the pole piece 100.

[0021] The utility model is provided with a lifting device 5 to bend the pole piece 100, and cooperates with a conveying device 1 and a receiving device 2 to unfold the pole piece 100, and a first supporting device 3 and a second supporting device 4 are also provided between the conveying device 1 and the receiving device 2. The pole piece 100 starts from the conveying device 1, passes through the first supporting device 3 and the second supporting device 4 in sequence, and is connected to the receiving device 2. The conveying device 1 is used to push the pole piece 100 so that the test part of the pole piece 100 is between the first supporting device 3 and the second supporting device 4. The lifting drive assembly 51 of the lifting device 5 is used to drive the bending shaft 52 to move in a direction perpendicular to the pole piece 100 to bend the test part of the pole piece 100 until the pole piece 100 breaks. By determining the distance that the bending shaft 52 moves when the pole piece 100 breaks, and by adjusting the radial size of the bending shaft 52, the flexibility of the pole piece 100 can be accurately and comprehensively quantitatively tested, which is beneficial to improving the accuracy and efficiency of evaluating the flexibility of the pole piece 100. Moreover, the test steps are simple, which is suitable for rapid detection of the pole piece 100 during large-scale production, thereby helping to improve the efficiency of battery production as well as the performance and service life of the battery.

[0022] See also Figure 1 and Figure 2 The lifting device 5 includes a visual sensor 53. The visual sensor 53 and the bending shaft 52 are respectively arranged on both sides of the test part of the pole piece 100 along the vertical direction. The visual sensor 53 is provided with a sensing end, and the sensing end faces the test part of the pole piece 100. The visual sensor 53 is used to detect and record the fracture of the test part of the pole piece 100, which is conducive to the realization of automatic detection, reduces the influence of subjective factors and improves the evaluation efficiency of the flexibility of the pole piece 100, and is suitable for rapid detection of the pole piece 100 during large-scale production.

[0023] Optionally, in this embodiment, the visual sensor 53 is arranged below the bending shaft 52 with the sensing end facing upward. The bending shaft 52 is driven by the lifting drive assembly 51 to bend the test portion of the pole piece 100 downward until the test portion of the pole piece 100 breaks, which is conducive to maintaining a single test variable and accurately performing quantitative testing on the flexibility of the pole piece 100.

[0024] Specifically, in this embodiment, the visual sensor 53 is a sensing device of the CCD visual system. The CCD visual system detects and records the fracture of the test part of the pole piece 100 through the visual sensor 53. At the same time, the CCD visual system records the time and moving distance from the bending axis 52 being pressed down from the fixed position to the fracture of the pole piece 100, so as to use this data to evaluate the flexibility of the pole piece 100 later.

[0025] In other embodiments, the test part of the pole piece 100 and the visual sensor 53 can also be arranged in sequence above the bending shaft 52, with the sensing end arranged downward toward the pole piece 100. The bending shaft 52 is driven by the lifting drive assembly 51 to bend the test part of the pole piece 100 upward until the test part of the pole piece 100 breaks.

[0026] See also Figure 1 and Figure 2 A connecting shaft 54 ​​is provided at the driving end of the lifting driving assembly 51 , and the bending shaft body 52 is roller-shaped and detachably mounted on the connecting shaft 54 ​​.

[0027] Specifically, in the present embodiment, when a certain inclination angle is formed in the middle portion of the pole piece 100, the pole piece 100 will appear to be broken and powdery. The better the flexibility of the pole piece 100, the greater the distance that the bending shaft 52 descends or the smaller the inclination angle that can be formed in the middle portion. Therefore, when the driving limit of the lifting drive assembly 51 is reached, if the pole piece 100 is still not broken, the bending shaft 52 with a smaller radial dimension can be replaced for a bending test, which is conducive to a comprehensive evaluation of the flexibility of the pole piece 100 and avoids being limited to observing the bending shaft 52 with a single radial dimension.

[0028] Specifically, in the present embodiment, the radial dimension of the bending shaft body 52 is adjustable by making the bending shaft body 52 detachable, so that the parameter settings of pole pieces 100 of different models can be adapted by installing bending shaft bodies 52 of different radial dimensions. For example, a bending shaft body 52 made of cemented carbide and with radial dimensions of 0.01 m, 0.02 m, 0.03 m and 0.04 m can be selected. The smaller the radial dimension of the bending shaft body 52, the more tortuous the path of the pole piece 100 in contact with it is, and the higher the flexibility requirement is. Therefore, by comparing the moving distance required for the bending shaft bodies 52 of different radial dimensions to move at a uniform speed from the initial position to break the pole piece 100, the flexibility of the pole piece 100 can be accurately measured, which is beneficial to reduce the influence of human factors and realize automatic detection, but is not limited to this.

[0029] See also Figure 1 and Figure 2 The first supporting device 3 and the second supporting device 4 are both provided with a transmission shaft assembly 61 and a correction sensor 62. The transmission shaft assembly 61 includes a first transmission shaft 611, a second transmission shaft 612 and two transmission brackets 613. The first transmission shaft 611 and / or the second transmission shaft 612 can be movably arranged on the transmission bracket 613 parallel to the pole piece 100. The correction sensor 62 is used to detect the position of the pole piece 100. The correction sensor 62 is connected to the transmission shaft assembly 61. The transmission shaft assembly 61 is used to control the rolling of the first transmission shaft 611 and the second transmission shaft 612 to transmit the pole piece 100, and is used to control the first transmission shaft 611 and / or the second transmission shaft 612 to correct the transmission position of the pole piece 100 according to the detection of the correction sensor 62, which is conducive to accurately controlling the position of the pole piece 100.

[0030] Specifically, in this embodiment, the first transmission shaft 611 rotates outward in a clockwise direction, and the second transmission shaft 612 rotates inward in a counterclockwise direction, so that the pole piece 100 can pass through the transmission shaft assembly 61 smoothly, and the correction sensor 62 is set on one side of the transmission shaft assembly 61 corresponding to the gap between the first transmission shaft 611 and the second transmission shaft 612, and detects the current position of the pole piece 100 to compare it with the normal position of the pole piece 100 to determine the deviated position of the pole piece 100. After detecting the deviation position of the pole piece 100, the correction sensor 62 sends a signal to the transmission shaft assembly 61, and the transmission shaft assembly 61 controls the first transmission shaft 611 and the second transmission shaft 612 to move left and right according to the received signal to automatically correct the offset of the pole piece 100, reduce the offset of the pole piece 100 during operation, make its running trajectory more accurate, and help improve production efficiency.

[0031] Specifically, in this embodiment, the radial dimension of the first transmission shaft 611 and the second transmission shaft 612 is 0.05 meters and the material is cemented carbide, but not limited thereto.

[0032] See also Figure 1 and Figure 2 The first supporting device 3 and the second supporting device 4 both include a partition plate 60 and two transmission shaft assemblies 61. The partition plate 60 is provided with a transmission gap 601. The two transmission shaft assemblies 61 are fixedly connected to the two sides of the partition plate 60 corresponding to the transmission gap 601, so that the pole piece 100 passes through a transmission shaft assembly 61, the transmission gap 601 and the other transmission shaft assembly 61 in sequence, which is conducive to accurately controlling the movement state of the pole piece 100.

[0033] Specifically, in this embodiment, the correction sensor 62 is arranged corresponding to one of the transmission shaft assemblies 61, and the transmission bracket 613 of the two transmission shaft assemblies 61 is fixedly connected to the partition plate 60, and is symmetrically arranged on both sides of the partition plate 60 so that the gap between the first transmission shaft 611 and the second transmission shaft 612 of the two transmission shaft assemblies 61 is at the same height as the transmission gap 601, which is beneficial to protect the pole piece 100 and prevent the pole piece 100 from being scratched when passing through the partition plate 60 of the first support device 3 and the second support device 4, but is not limited to this.

[0034] Specifically, in this embodiment, when performing a bending test, the transmission shaft assembly 61 located at the second support device 4 remains stationary, while the transmission shaft assembly 61 located at the first support device 3 is transmitted inward to transmit a certain length of the pole piece 100 to the lifting device 5, which is beneficial to ensure the limit of the bending test of the pole piece 100. At the same time, the position of the test pole piece 100 can be accurately controlled by transmission, but it is not limited to this.

[0035] See also Figure 1 and Figure 2 The conveying device 1 is provided with a roll-feeding assembly 11, and the receiving device 2 is provided with a roll-reeling assembly 21. The roll-feeding assembly 11 and the roll-reeling assembly 21 both include a device bracket 101, a driver 102, a driving wheel 103, a passive wheel 104 and a connecting belt 105 arranged on the device bracket 101. The driving wheel 103 is installed on the driving end of the driver 102, and the passive wheel 104 includes a connecting portion 1041 and a roller portion 1042. The roller portion 1042 is connected to the pole piece 100, and the connecting belt 105 is wound between the driving wheel 103 and the connecting portion 1041. The driver 102 is used to drive the driving wheel 103 to rotate so as to drive the roller portion 1042 to rotate through the connecting belt 105 and the connecting portion 1041, which is conducive to accurately controlling the movement state of the pole piece 100.

[0036] Specifically, in this embodiment, the electrode sheet will be cut into small rolls during production, and then the small roll electrode sheet will be cut into one electrode sheet (1 PCS) again. When performing the flexibility test, in combination with the operation of the device, a electrode sheet 100 is manually installed to the feeding assembly 11 and the winding assembly 21, and the flexibility of the electrode sheet 100 is tested by the lifting device 5. According to actual needs, multiple electrode sheets 100 and different types of electrode sheets 100 are tested for comparison, so as to quantitatively test the flexibility of the electrode sheet 100.

[0037] See also Figure 1 and Figure 2 The conveying device 1 includes a coiling assembly 11 and a tension assembly 12. The coiling assembly 11 is provided with a reeling roller 111 and a brake 112. The reeling roller 111 is connected to the pole piece 100. The coiling assembly 11 is used to control the rotation of the reeling roller 111 to push the pole piece 100 to the first supporting device 3. The tension assembly 12 is arranged between the coiling assembly 11 and the first supporting device 3. The tension assembly 12 includes a tension detector 121 and a tension controller 122. The tension detector 121 is in contact with the pole piece 100 and is used to detect the tension of the pole piece 100. The tension controller 122 is connected to the tension detector 121 and the brake 112. The tension controller 122 is used to adjust the reeling resistance formed by the reeling roller 111 under the action of the brake 112 according to the detection of the tension detector 121, which is beneficial to keep the pole piece 100 in a taut state, improve the accuracy of quantifying the flexibility of the pole piece 100, and then accurately evaluate the quality of the pole piece 100, and improve the performance and service life of the battery.

[0038] Optionally, the tension assembly 12 includes a first roller 123, a second roller 124, and a tension detector 121 arranged between the first roller 123 and the second roller 124, the arrangement height of the lower tangent of the first roller 123 and the second roller 124 is less than the arrangement height of the upper tangent of the tension detector 121, and the pole piece 100 contacts the upper side of the first roller 123, the lower side of the tension detector 121, and the upper side of the second roller 124 in sequence, which is conducive to the tension detector 121 to closely contact the pole piece 100 and accurately detect.

[0039] Specifically, in this embodiment, Figure 2 As shown, the brake 112 is a magnetic powder brake, and the brake 112 is connected to the tension controller 122 via the power amplifier 125. The tension controller 122 determines the tension of the pole piece 100 according to the tension detection value of the tension detector 121, and outputs a control signal for adjusting the brake 112 in real time. The control signal is amplified by the power amplifier 125 and then input into the brake 112, which is conducive to the realization of constant tension control. Before conducting the flexibility test, after the tension of the pole piece 100 is adjusted, the lifting drive assembly 51 drives the bending shaft 52 in the initial position to press down the bending pole piece 100, but is not limited to this.

[0040] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A battery pole piece flexibility testing device, characterized in that: include: A conveying device, a receiving device, a first supporting device, a second supporting device and a lifting device, The first supporting device and the second supporting device are arranged between the conveying device and the receiving device, one end of the electrode piece is connected to the conveying device, and the other end passes through the first supporting device and the second supporting device in sequence and then is connected to the receiving device, and the conveying device is used to push the electrode piece toward the receiving device so that the testing part of the electrode piece is between the first supporting device and the second supporting device; The lifting device includes a lifting drive assembly and a bending shaft body. The radial size of the bending shaft body is adjustable. The bending shaft body is installed at the driving end of the lifting drive assembly. The lifting drive assembly is used to drive the bending shaft body to move in a direction perpendicular to the pole piece so that the bending shaft body bends the test part of the pole piece.

2. The battery pole piece flexibility testing device according to claim 1, characterized in that: A connecting shaft is provided at the driving end of the lifting driving assembly, and the bending shaft body is roller-shaped and detachably mounted on the connecting shaft.

3. The battery pole piece flexibility testing device according to claim 1, characterized in that: The lifting device includes a visual sensor, and the visual sensor and the bending shaft are respectively arranged on both sides of the test part of the pole piece in the vertical direction. The visual sensor is provided with a sensing end, and the sensing end faces the test part of the pole piece. The visual sensor is used to detect and record the fracture of the test part of the pole piece.

4. The battery pole piece flexibility testing device according to claim 3, characterized in that: The visual sensor is arranged below the bending shaft, and the sensing end is arranged upward. The bending shaft is driven by the lifting drive component to bend the test part of the pole piece downward until the test part of the pole piece breaks.

5. The battery pole piece flexibility testing device according to claim 1, characterized in that: The first supporting device and the second supporting device are both provided with a transmission shaft assembly and a correction sensor, the transmission shaft assembly includes a first transmission shaft, a second transmission shaft and two transmission brackets, the first transmission shaft and / or the second transmission shaft can be movably arranged on the transmission bracket parallel to the pole piece, the correction sensor is used to detect the position of the pole piece, the correction sensor is connected to the transmission shaft assembly, the transmission shaft assembly is used to control the first transmission shaft and the second transmission shaft to roll to drive the pole piece, and is used to control the first transmission shaft and / or the second transmission shaft to correct the position of the pole piece transmission according to the detection of the correction sensor.

6. The battery pole piece flexibility testing device according to claim 1, characterized in that: The first supporting device and the second supporting device both include a partition plate and two transmission shaft assemblies, the partition plate is provided with a transmission gap, and the two transmission shaft assemblies are fixedly connected to the two sides of the partition plate corresponding to the transmission gap, so that the pole piece passes through one transmission shaft assembly, the transmission gap and the other transmission shaft assembly in sequence.

7. The battery pole piece flexibility testing device according to claim 1, characterized in that: The conveying device is provided with a roll-feeding assembly, and the receiving device is provided with a roll-reeling assembly. The roll-feeding assembly and the roll-reeling assembly both include a device bracket, a driver, a driving wheel, a driven wheel and a connecting belt arranged on the device bracket, the driving wheel is installed on the driving end of the driver, the driven wheel includes a connecting part and a roller part, the roller part is connected to the pole piece, the connecting belt is wound between the driving wheel and the connecting part, and the driver is used to drive the driving wheel to rotate so as to drive the roller part to rotate through the connecting belt and the connecting part.

8. The battery pole piece flexibility testing device according to claim 1, characterized in that: The conveying device includes a coil feeding assembly and a tension assembly, the coil feeding assembly is provided with an unwinding roller and a brake, the unwinding roller is connected to a pole piece, the coil feeding assembly is used to control the rotation of the unwinding roller to push the pole piece toward the first supporting device, the tension assembly is arranged between the coil feeding assembly and the first supporting device, the tension assembly includes a tension detector and a tension controller, the tension detector is in contact with the pole piece and is used to detect the tension of the pole piece, the tension controller is connected to the tension detector and the brake, and the tension controller is used to adjust the unwinding resistance formed by the unwinding roller under the action of the brake according to the detection of the tension detector.

9. The battery pole piece flexibility testing device according to claim 8, characterized in that: The tension assembly includes a first roller, a second roller, and the tension detector arranged between the first roller and the second roller. The arrangement height of the lower tangent lines of the first roller and the second roller is smaller than the arrangement height of the upper tangent line of the tension detector. The pole piece contacts the upper side of the first roller, the lower side of the tension detector, and the upper side of the second roller in sequence.

Images