Pole piece flexibility detection device and control method thereof, and coating machine

Abstract

This application relates to the field of battery electrode manufacturing technology, and in particular to an electrode flexibility testing device and its control method, as well as a coating machine. The electrode flexibility testing device includes two sides of an electrode located between the unwinding and rewinding stations. A sampling mechanism can move towards a testing mechanism to push the electrode located between them as a test sample to the testing mechanism. After pushing, the test sample can be cut off from the electrode to complete the sampling. The testing mechanism receives the test sample and tests its flexibility. This achieves sampling of the electrode before rewinding, which is simpler than the conventional method of sampling from the electrode after rewinding, and also avoids the problem of electrode waste caused by unqualified test results.

Description

Technical Field

[0001] This application relates to the field of battery electrode manufacturing technology, and in particular to an electrode flexibility testing device and its control method, and a coating machine. Background Technology

[0002] The preparation of battery electrodes typically involves first coating a blank foil with a slurry using a coating device to form a coating layer, then drying it in an oven to form the electrode sheet, and finally winding it up using a winding device. The flexibility of the electrode sheet is a crucial factor affecting battery design. After coating and drying, it is usually necessary to sample the electrode sheet for flexibility testing. Currently, electrode samples are generally cut from the winding device to obtain sheet-like electrodes for testing. However, this sampling method is not only cumbersome, but also leads to waste of all the electrode sheets in the oven and those that have already been dried, wound, and wound up if the test results do not meet the standards. Summary of the Invention

[0003] The purpose of this invention is to provide an electrode flexibility testing device and its control method, as well as a coating machine, so as to enable sampling of the electrode before winding, avoid the problem of waste caused by substandard testing, and simplify the sampling method to a certain extent.

[0004] This invention provides an electrode flexibility testing device, comprising a sampling mechanism and a testing mechanism;

[0005] The sampling mechanism and the detection mechanism are arranged at intervals to allow the electrode sheet to pass through between the unwinding station and the rewinding station of the coating machine.

[0006] The sampling mechanism is capable of moving toward the detection mechanism to push the electrode located between the sampling mechanism and the detection mechanism as a test sample to the detection mechanism, and the sampling mechanism is capable of cutting the electrode to separate the test sample from the electrode;

[0007] The testing institution is used to receive the test sample and perform flexibility testing on the test sample.

[0008] Furthermore, the sampling mechanism includes a first driving member, a first pushing roller, and a second pushing roller;

[0009] The length directions of the first pusher roller and the second pusher roller are both along the width direction of the electrode sheet, and the first pusher roller and the second pusher roller are arranged side by side at intervals along the length direction of the electrode sheet;

[0010] One end of the first pusher roller and one end of the second pusher roller are respectively connected to the driving end of the pusher drive member, and the pusher drive member can drive the first pusher roller and the second pusher roller to move toward the detection mechanism.

[0011] Furthermore, the first pusher roller and the second pusher roller are respectively provided with cutters, and the cutters on the first pusher roller and the second pusher roller can rotate toward the electrode sheet to cut the electrode sheet.

[0012] Furthermore, the electrode flexibility testing device also includes a splicing mechanism, which is disposed between the electrode and the testing mechanism. The splicing mechanism includes a first hot-pressing member and a second hot-pressing member spaced apart along the length direction of the electrode.

[0013] When the sampling mechanism pushes the test sample toward the detection mechanism, the sampling mechanism can drive the electrode sheet to pass between the first hot press and the second hot press;

[0014] The first hot press member and the second hot press member are capable of moving towards each other to hot press the electrode sheet located between the first hot press member and the second hot press member.

[0015] Furthermore, the electrode flexibility testing device also includes a second driving member, the driving end of which is connected to the sampling mechanism, and the second driving member is capable of driving the sampling mechanism to move along the width direction of the electrode.

[0016] Furthermore, the testing mechanism includes a conveyor belt, a first roller, and a second roller; the first roller and the second roller are arranged side by side at intervals, and the first roller and the second roller are capable of rotating in the same direction around their own axes, and the conveyor belt is wound around the first roller and the second roller; the test sample can be pushed onto the conveyor belt.

[0017] Furthermore, the second roller is opposite to the sampling mechanism, and the first pusher roller and the second pusher roller can move to both sides of the second roller.

[0018] Furthermore, the flexibility testing device is located upstream or downstream of the oven of the coating machine.

[0019] The present invention also provides a coating machine, including the electrode flexibility testing device described in any of the above claims.

[0020] The present invention also provides a control method for an electrode flexibility testing device, comprising the following steps:

[0021] A portion of the coated and dried electrode sheet is selected as a test sample, and the test sample is moved between the sampling mechanism and the testing mechanism.

[0022] The sampling mechanism pushes the test sample to the testing mechanism, and after the electrodes at both ends of the test sample are joined, the test sample is cut and separated from the electrodes.

[0023] The testing agency moves the test sample to simulate the actual transportation of the electrode, and determines the flexibility of the electrode based on the cracking or powder loss of the electrode with different coating materials during movement.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The electrode flexibility testing device provided by this invention includes a sampling mechanism and a testing mechanism, which are respectively located on both sides of the electrode, allowing the electrode between the unwinding station and the winding station to pass between the sampling mechanism and the testing mechanism. The sampling mechanism can move toward the testing mechanism to push the electrode located between the sampling mechanism and the testing mechanism to the testing mechanism. After pushing, the sampling mechanism can cut off the electrode pushed to the testing mechanism to complete the sampling of the electrode. The cut-off electrode is used as a test sample, and the testing mechanism receives the test sample and tests its flexibility.

[0026] Therefore, when it is necessary to sample the electrode sheet for flexibility testing, a test area can be selected on the electrode sheet between the unwinding station and the winding station before the electrode sheet is wound up. The electrode sheet in the test area is then moved between the testing mechanism and the sampling mechanism so that the sampling mechanism can take a sample from the test area. This achieves sampling of the electrode sheet before winding up. Compared with the conventional method of sampling from the electrode sheet after winding up, this method is not only simpler, but also avoids the problem of electrode sheet waste caused by unqualified test results.

[0027] This invention also provides a control method for an electrode flexibility testing device, comprising the following steps: First, a portion of the coated and dried electrode is selected as a test sample, and the test sample is moved between a sampling mechanism and a testing mechanism; next, the test sample is pushed to the testing mechanism by the sampling mechanism, and after the electrode pieces at both ends of the test sample are joined, the test sample is cut and separated from the electrode; next, the test sample is moved by the testing mechanism to simulate the actual transportation of the electrode, and the flexibility of the electrode is determined based on the cracking or powder shedding of electrode pieces coated with different films during movement. The control method of this application enables sampling and flexibility testing of the electrode before winding, avoiding the problem of electrode waste caused by unqualified test results.

[0028] The present invention also provides a coating machine including the aforementioned electrode flexibility testing device, thus the coating machine also has the beneficial effects of the electrode flexibility testing device. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the electrode flexibility testing device provided in an embodiment of the present invention from a first-view perspective.

[0031] Figure 2 This is a schematic diagram of the electrode flexibility testing device provided in an embodiment of the present invention from a second perspective.

[0032] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 A schematic diagram of the moving route of the sampling mechanism of the electrode flexibility testing device provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the detection mechanism of the electrode flexibility testing device provided in an embodiment of the present invention.

[0035] Figure label:

[0036] 1-Electrode, 11-Test sample, 2-Sampling mechanism, 21-First pusher roller, 22-Second pusher roller, 23-Cutter, 24-First drive component, 25-Second drive component, 3-Detection mechanism, 31-First roller component, 32-Second roller component, 33-Tension roller, 34-Conveyor belt, 35-First pulley, 36-Second pulley, 37-Drive belt, 38-Rotation drive component, 4-Belt splicing mechanism, 41-First hot pressing component, 42-Second hot pressing component. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0039] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The following reference Figures 1 to 5 This application describes an electrode flexibility testing device, its control method, and a coating machine according to some embodiments thereof.

[0043] This application provides a device for testing the flexibility of an electrode sheet 1, which is set between the unwinding station and the rewinding station of a coating machine to sample and test the flexibility of the electrode sheet 1 before it is rewound.

[0044] like Figures 1 to 3 As shown, the electrode sheet 1 flexibility testing device of this application includes a sampling mechanism 2 and a testing mechanism 3. The sampling mechanism 2 and the testing mechanism 3 are respectively located on both sides of the electrode sheet 1, so that the electrode sheet 1 between the unwinding station and the winding station passes through the sampling mechanism 2 and the testing mechanism 3. The sampling mechanism 2 can move toward the testing mechanism 3 to push the electrode sheet 1 located between the sampling mechanism 2 and the testing mechanism 3 to the testing mechanism 3. After pushing, the sampling mechanism 2 can cut off the electrode sheet 1 pushed to the testing mechanism 3 to complete the sampling of the electrode sheet 1. The cut-off electrode sheet 1 is used as a test sample 11. The testing mechanism 3 receives the test sample 11 and tests its flexibility.

[0045] Therefore, when it is necessary to sample electrode 1 for flexibility testing, a test area can be selected on electrode 1 between the unwinding station and the winding station before the electrode 1 is wound up. The electrode 1 in the test area is then moved between the testing mechanism 3 and the sampling mechanism 2 so that the sampling mechanism 2 can take a sample from the test area. This achieves sampling of electrode 1 before winding up. Compared with the conventional method of sampling electrode 1 after winding up, this method is not only simpler, but also avoids the problem of electrode waste caused by unqualified test results.

[0046] In one embodiment of this application, preferably, in combination with Figure 3 and Figure 4 As shown, the sampling mechanism 2 includes a first driving member 24 and a first pusher roller 21 and a second pusher roller 22 disposed at the driving end of the first driving member 24. The length directions of the first pusher roller 21 and the second pusher roller 22 are both along the width direction of the electrode 1, and the first pusher roller 21 and the second pusher roller 22 are arranged side by side at intervals along the length direction of the electrode 1. The first driving member 24 can drive the first pusher roller 21 and the second pusher roller 22 to move toward the detection mechanism 3 at the same time and press on the detection mechanism 3, so that the electrode 1 located between the first pusher roller 21 and the second pusher roller 22 can move toward the detection mechanism 3 and press on the detection mechanism 3 under the push of the two.

[0047] In this embodiment, preferably, as follows: Figure 3 As shown, the first pusher roller 21 and the second pusher roller 22 are also provided with cutters 23. When the first pusher roller 21 and the second pusher roller 22 push the electrode 1 located between them to the detection mechanism 3, the cutters 23 on the first pusher roller 21 and the second pusher roller 22 can rotate toward the electrode 1 so as to cut the electrode 1 through the cutters 23 on the two pusher rollers, thereby obtaining a section of the electrode 1 as a test sample 11, and completing the cutting and sampling of the electrode 1.

[0048] Preferably, the cutter 23 is fixedly connected to the corresponding pusher roller, and the sampling mechanism 2 is provided with a first rotary drive member for driving the first pusher roller 21 and the second pusher roller 22 to rotate, so that the first pusher roller 21 and the second pusher roller 22 can rotate around their own axes respectively, thereby driving the cutter 23 connected to them to rotate, and realizing the cutting and sampling of the electrode sheet 1. Alternatively, the cutter 23 is rotatably connected to the corresponding pusher roller, and the sampling mechanism 2 is provided with a second rotary drive member, which is connected to the cutter 23 on the first pusher roller 21 and the second pusher roller 22 respectively, so as to drive the two cutters 23 to rotate, thereby realizing the cutting and sampling of the electrode sheet 1 while avoiding wear on the electrode sheet 1 caused by the rotation of the pusher roller.

[0049] In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 3As shown, the electrode 1 flexibility testing device also includes a tape-joining mechanism 4, which can join the electrode 1 located at both ends of the test sample 11, so that after the sampling mechanism 2 completes the cutting and sampling of the electrode 1, the remaining electrode 1 can be joined, so as not to affect the normal transport of the electrode 1 from the unwinding station to the rewinding station.

[0050] Specifically, the receiving mechanism 4 is located between the sampling mechanism 2 and the testing mechanism 3, and the receiving mechanism 4 and the testing mechanism 3 are located on the same side of the electrode 1; the receiving mechanism 4 includes a first hot-pressing component 41 and a second hot-pressing component 42, which are spaced apart along the length of the electrode 1, and the pushing path of the sampling mechanism 2 is located between the first hot-pressing component 41 and the second hot-pressing component 42, that is, when the sampling mechanism 2 pushes the test sample 11 toward the testing mechanism 3, the sampling mechanism 2 can drive the electrode 1 from The first hot press 41 and the second hot press 42 pass between each other, so that the electrode 1 outside both ends of the test sample 11 is located between the first hot press 41 and the second hot press 42; the first hot press 41 and the second hot press 42 can move towards each other to hot press and join the electrode 1 outside both ends of the test sample 11, that is, to complete the joining of the electrode 1; so that after the test sample 11 is cut off, the remaining electrode 1 can be joined together so as not to affect the normal conveying of the electrode 1 from the unwinding station to the rewinding station.

[0051] In actual operation, the test sample 11 can be pushed to the detection mechanism 3 through the sampling mechanism 2 first, and then the electrode 1 connected to both ends of the test sample 11 can be connected through the hot pressing mechanism. After the connection is completed, the test sample 11 can be cut and separated from the electrode 1 by the cutter 23 on the sampling mechanism 2.

[0052] In this embodiment, preferably, as follows: Figure 4 As shown, in order to enable the sampling mechanism 2 to return to its initial position after the electrode 1 has finished sampling and splicing, the electrode 1 flexibility testing device also includes a second driving member 25. The driving end of the second driving member 25 is connected to the sampling mechanism 2, and the second driving member 25 can drive the sampling mechanism 2 to move along the width direction of the electrode 1, so that the sampling mechanism 2 (specifically the first pusher roller 21 and the second pusher roller 22 of the sampling mechanism 2) is moved away from the position opposite to the electrode 1.

[0053] Specifically, with the side of electrode 1 facing the sampling mechanism 2 as the lower part of electrode 1, in the initial state, the first pusher roller 21 and the second pusher roller 22 are suspended directly above electrode 1 under the action of the first drive member 24 and the second drive member 25; during sampling, the first drive member 24 drives the first pusher roller 21 and the second pusher roller 22 to move towards the detection mechanism 3, and presses one end of electrode 1 as test sample 11 onto the detection mechanism 3. After the tape splicing and cutting sampling are completed, the electrode 1 after splicing is stopped above the first pusher roller 21 and the second pusher roller 22, preventing the second pusher roller 22 from returning to the top of the electrode 1 along the original path under the drive of the first drive member 24. At this time, the first pusher roller 21 and the second pusher roller 22 can be moved along the width direction of the electrode 1 by the second drive member 25 to completely move out from directly below the electrode 1. Then, the first pusher roller 21 and the second pusher roller 22 can be driven back to the top of the electrode 1 by the first drive member 24 and the second drive member 25 to enable the next sampling.

[0054] In one embodiment of this application, preferably, as shown below, Figure 2 and Figure 5 As shown, the testing mechanism 3 includes a conveyor belt 34, and the sampling mechanism 2 can push the test sample 11 onto the conveyor belt 34 to transport the sampled test sample 11 via the conveyor belt 34.

[0055] In one embodiment of this application, preferably, as shown below, Figure 2 As shown, the testing mechanism 3 includes a first roller 31 and a second roller 32. A conveyor belt 34 is wound around the first roller 31 and the second roller 32. The first roller 31 and the second roller 32 can rotate in the same direction to drive the conveyor belt 34. Preferably, the conveyor belt 34 is provided with an adhesive layer. When the test sample 11 is pushed onto the conveyor belt 34, the test sample 11 can be adhered to the conveyor belt 34 so that the test sample 11 can be transported through the conveyor belt 34 and pass around the first roller 31 and the second roller 32. This simulates the situation of the test sample 11 passing around the rollers during actual transportation, and compares the cracking or powder loss of different film materials on the test sample 11 after several rotations to determine the flexibility of the electrode 1.

[0056] In this embodiment, preferably, as follows: Figure 3 As shown, the second roller 32 faces the sampling mechanism 2. When the sampling mechanism 2 pushes the test sample 11 towards the detection mechanism 3, the first pusher roller 21 and the second pusher roller 22 of the sampling mechanism 2 can move to both sides of the second roller 32, so that the test sample 11 wraps around the second roller 32 and covers the conveyor belt 34. This makes the test sample 11 fit better with the conveyor belt 34 when it is pushed onto the conveyor belt 34, and avoids voids between them to a certain extent.

[0057] In this embodiment, preferably, as follows: Figure 2 and Figure 5 As shown, the testing mechanism 3 also includes a tension roller 33, which is vertically slidably disposed below the first roller 31 and the second roller 32, and the conveyor belt 34 is wound around the tension roller 33. Thus, the weight of the tension roller 33 can provide tension to the conveyor belt 34, so that the conveyor belt 34 is kept taut, and slippage between the conveyor belt 34 and the first roller 31 and the second roller 32 is avoided, which would affect the accuracy of the test.

[0058] In this embodiment, preferably, as follows: Figure 5 As shown, the detection mechanism 3 also includes a rotary drive 38, a first pulley 35, and a second pulley 36. The drive end of the rotary drive 38 is connected to the second pulley 36 to drive the second pulley 36 to rotate. The first pulley 35 and the second pulley 36 are connected by a transmission belt 37, enabling the first pulley 35 and the second pulley 36 to rotate in the same direction. The first roller 31 is coaxially connected to the first pulley 35, and the second roller 32 is coaxially connected to the second pulley 36, thereby driving the first roller 31 and the second roller 32 to rotate synchronously through the first pulley 35 and the second pulley 36.

[0059] In this embodiment, preferably, the first pulley 35 is provided with a first claw, and one end of the first roller 31 can be detachably engaged with the first pulley 35 through the first claw, so that the first roller 31 can be detached and replaced. When performing flexibility tests, the first roller 31 can be replaced with one of the same or different diameters as the second roller 32, so that the cracking or powder loss of different film materials under the same roller diameter can be compared, or the cracking or powder loss of the same film material under different roller diameters can be compared.

[0060] Preferably, the second pulley 36 is provided with a second claw, and one end of the second roller 32 can be detachably connected to the second pulley 36 through the second claw, so that the second roller 32 can also be disassembled and replaced.

[0061] In one embodiment of this application, preferably, the coating machine further includes a coating device and an oven disposed between the winding station and the rewinding station, and the electrode 1 flexibility testing device can be used as follows: Figure 1 As shown, the electrode 1 flexibility testing device is located upstream of the oven, that is, between the winding station and the oven. Alternatively, the electrode 1 flexibility testing device can be located downstream of the oven, that is, between the oven and the winding station.

[0062] If the electrode 1 flexibility testing device is located upstream of the oven, during testing, the electrode 1 in the sampling area needs to be returned to the electrode 1 flexibility testing device after being dried in the oven for sampling and flexibility testing; if the electrode 1 flexibility testing device is located downstream of the oven, during testing, the electrode 1 in the sampling area needs to be moved forward to the electrode 1 flexibility testing device after being dried in the oven for sampling and flexibility testing.

[0063] In one embodiment of this application, preferably, the electrode 1 flexibility testing device further includes a material trough, which is disposed below the testing mechanism 3 to collect powder falling from the electrode 1. Preferably, the material trough is placed on a gravity sensor so that the falling powder can be weighed by the gravity sensor, and the real-time change in the amount of powder falling during the test can be obtained.

[0064] Preferably, the electrode 1 flexibility detection device further includes a control unit, and the gravity sensor is communicatively connected to the control unit, enabling the control unit to receive the data uploaded by the gravity sensor and obtain the change curve of powder loss at different times.

[0065] In one embodiment of this application, the electrode 1 flexibility testing device further includes a frame, a material trough, and a rotation drive 38 of the testing mechanism 3 mounted on the frame.

[0066] Preferably, the driving end of the rotary drive 38 is provided with a driving pulley, and a driven pulley is coaxially connected to the second pulley 36. The driving pulley is connected to the driven pulley through a transmission belt. The rotary drive 38 is vertically slidably mounted on the frame, and a first transmission screw is provided between the rotary drive 38 and the frame. The first transmission screw is arranged in the vertical direction, one end of the first transmission screw is rotatably connected to the housing of the rotary drive 38, and the other end of the first transmission screw is screwed to the frame. Thus, when the first transmission screw is rotated, the position of the rotary drive 38 in the vertical direction can be adjusted, thereby adjusting the tension of the transmission belt between the driving pulley and the driven pulley.

[0067] Preferably, the material trough is slidably connected to the frame in a vertical direction, and a second transmission screw is provided between the material trough and the frame. The second transmission screw is arranged in a vertical direction, and one end of it is rotatably connected to the material trough, while the other end is screwed to the frame. Thus, the installation height of the material trough on the frame can be adjusted by rotating the second transmission screw.

[0068] In one embodiment of this application, preferably, the electrode 1 flexibility testing device further includes an imaging unit, which is located on one side of the testing mechanism 3, for capturing images of the surface crack changes of the test sample 11.

[0069] When judging the flexibility of the electrode by the cracking or powder loss of the film material on the test sample, the imaging unit can capture images of the predetermined imaging area on the test sample and identify the crack area on the nth imaging area and the crack area on the (n+1)th imaging area. By calculating the area difference between the two imaging areas or comparing the non-overlapping parts of the crack areas on both sides, the shape and area of ​​the newly added crack can be obtained.

[0070] The image acquisition time for the two image acquisition areas can be between predetermined time intervals, which is the time it takes for the conveyor belt to run one revolution under ideal conditions. Alternatively, the formation of the conveyor belt can be calculated by an encoder set on the roller (first roller or second roller), and the position of the test sample can be determined by the driving distance of the roller.

[0071] This application also provides a control method for an electrode flexibility testing device, comprising the following steps:

[0072] First, a portion of the coated and dried electrode is selected as a test sample, and the test sample is moved between the sampling mechanism and the testing mechanism.

[0073] Next, the sampling mechanism pushes the test sample onto the conveyor belt of the testing mechanism, and after the electrodes at both ends of the test sample are joined, the test sample is cut and separated from the electrodes.

[0074] In this step, specifically, the first and second pusher rollers of the sampling mechanism move toward the testing mechanism to push the test sample toward the testing mechanism and press the test sample onto the conveyor belt of the testing mechanism. Then, the electrode sheets at both ends of the test sample are hot-pressed together by the first and second hot-pressing components of the hot-pressing mechanism. Finally, the test sample is cut off from the electrode sheet by the cutter on the first and second rollers to complete the sampling of the electrode sheet and to join the sampled electrode sheet together so as not to affect its normal transport.

[0075] The next step is to use a testing agency to move the test samples to simulate the actual transportation of the electrode sheets, and to determine the flexibility of the electrode sheets based on the cracking or powder loss of the electrode sheets coated with different films during the movement.

[0076] In this step, the conveyor belt of the testing mechanism drives the test sample to move around the first roller, the second roller and the tension roller of the testing mechanism to simulate the situation of the electrode sheet moving around the roller during actual transportation. The cracking or powder loss of the electrode sheet coated with different film materials is compared after a predetermined number of rotations to determine the flexibility of the electrode sheet.

[0077] This application also provides a coating machine, including the electrode sheet 1 flexibility testing device of any of the above embodiments.

[0078] In this embodiment, the coating machine includes an electrode 1 flexibility testing device, and therefore the coating machine has all the beneficial effects of the electrode 1 flexibility testing device, which will not be described in detail here.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the flexibility of electrode sheets, characterized in that, This includes sampling agencies and testing agencies; The sampling mechanism and the detection mechanism are arranged at intervals to allow the electrode sheet to pass through between the unwinding station and the rewinding station of the coating machine. The sampling mechanism is capable of moving toward the detection mechanism to push the electrode located between the sampling mechanism and the detection mechanism as a test sample to the detection mechanism, and the sampling mechanism is capable of cutting the electrode to separate the test sample from the electrode; The testing institution is used to receive the test sample and perform flexibility testing on the test sample; The sampling mechanism includes a first driving component, a first pushing roller, and a second pushing roller; The length directions of the first pusher roller and the second pusher roller are both along the width direction of the electrode sheet, and the first pusher roller and the second pusher roller are arranged side by side at intervals along the length direction of the electrode sheet; One end of the first pusher roller and one end of the second pusher roller are respectively connected to the driving end of the first driving member, and the first driving member can drive the first pusher roller and the second pusher roller to move toward the detection mechanism; The first pusher roller and the second pusher roller are respectively provided with cutters, and the cutters on the first pusher roller and the second pusher roller can rotate toward the electrode sheet to cut the electrode sheet; The electrode flexibility testing device further includes a bonding mechanism, which is disposed between the electrode and the testing mechanism. The bonding mechanism includes a first hot-pressing component and a second hot-pressing component spaced apart along the length direction of the electrode. When the sampling mechanism pushes the test sample toward the detection mechanism, the sampling mechanism can drive the electrode sheet to pass between the first hot press and the second hot press; The first hot press member and the second hot press member are capable of moving towards each other to hot press the electrode sheet located between the first hot press member and the second hot press member.

2. The electrode flexibility testing device according to claim 1, characterized in that, It also includes a second driving member, the driving end of which is connected to the sampling mechanism, and the second driving member is capable of driving the sampling mechanism to move along the width direction of the electrode.

3. The electrode flexibility testing device according to claim 1, characterized in that, The detection mechanism includes a conveyor belt, a first roller, and a second roller; The first roller and the second roller are arranged side by side with a gap between them. The first roller and the second roller are able to rotate in the same direction around their own axis. The conveyor belt is wound around the first roller and the second roller. The test sample can be pushed onto the conveyor belt.

4. The electrode flexibility testing device according to claim 3, characterized in that, The second roller is opposite to the sampling mechanism, and the first pusher roller and the second pusher roller can move to both sides of the second roller.

5. The electrode flexibility testing device according to claim 1, characterized in that, The flexibility testing device is located upstream or downstream of the oven of the coating machine.

6. A coating machine, characterized in that, The electrode flexibility testing device includes any one of claims 1 to 5.

7. A control method for the electrode flexibility testing device according to any one of claims 1 to 6, characterized in that, Includes the following steps: A portion of the coated and dried electrode sheet is selected as a test sample, and the test sample is moved between the sampling mechanism and the testing mechanism. The sampling mechanism pushes the test sample to the testing mechanism, and after the electrodes at both ends of the test sample are joined, the test sample is cut and separated from the electrodes. The testing agency moves the test sample to simulate the actual transportation of the electrode, and determines the flexibility of the electrode based on the cracking or powder loss of the electrode with different coating materials during movement.

Images