Pole piece flexibility testing device, testing method and battery device production system

Abstract

The embodiment of the invention provides a pole piece flexibility testing device, a testing method and a battery device production system. A bearing mechanism in the pole piece flexibility testing device is used for placing a pole piece to be tested; the folding mechanism can fold the to-be-tested pole piece and unfold the folded to-be-tested pole piece; the rolling mechanism is used for rolling the folded to-be-tested pole piece to form a crease; an image acquisition unit in the image recognition mechanism is used for acquiring an image at the crease, an image processing unit is used for determining whether the crease is light-transmitting or not according to the image, and the turnover mechanism can turn over the to-be-detected pole piece, so that the folding direction of the to-be-detected pole piece is alternately changed. The pole piece flexibility testing device can determine whether the crease is light-transmitting or not according to the image acquired by the image acquisition unit, human errors caused by determining whether the crease is light-transmitting or not through human eyes are reduced, the accuracy of a pole piece flexibility testing result is improved, and the flexibility of a pole piece used in a battery device can be effectively controlled.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece flexibility testing device, a testing method and a battery device production system. Background Art

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0003] As the application scope of battery devices continues to expand, people's requirements for the reliability of battery devices are getting higher and higher. Among them, the reliability of the pole piece has a very important influence on the reliability of the battery device. Therefore, the flexibility of the pole piece, which has a very important influence on the reliability of the pole piece, has attracted the attention of technical personnel in this field. At present, the evaluation of the flexibility of the pole piece is usually carried out through manual testing and identification, which brings a large error to the results of the pole piece flexibility test, which is not conducive to improving the accuracy of the pole piece flexibility test results. Summary of the invention

[0004] In view of the above problems, the present application provides a pole piece flexibility testing device, a testing method and a battery device production system. The pole piece flexibility testing device is beneficial to improving the accuracy of the pole piece flexibility test results and helps to improve the reliability of the pole pieces used in the battery device.

[0005] In a first aspect, some embodiments of the present application provide a pole piece flexibility testing device, which includes a bearing mechanism, a folding mechanism, a rolling mechanism, an image recognition mechanism and a flipping mechanism. The bearing mechanism includes a bearing platform, and the bearing platform is used to place the pole piece to be tested; the folding mechanism is connected to the bearing mechanism, and the folding mechanism can fold the pole piece to be tested in half and unfold the folded pole piece to be tested; the rolling mechanism is connected to the bearing mechanism; in a direction perpendicular to the surface of the bearing platform where the pole piece to be tested is placed, the rolling mechanism is arranged on a side of the pole piece to be tested away from the bearing platform, and the rolling mechanism is used to roll the pole piece to be tested. The electrode piece to be tested is folded to form a crease; the image recognition mechanism includes an image acquisition unit and an image processing unit, the image acquisition unit is arranged on the carrying mechanism and is used to acquire the image at the crease, the image processing unit is communicatively connected with the image acquisition unit, and the image processing unit is used to determine whether the crease is light-transmissive according to the image; the flipping mechanism includes a suction cup and a second driver, the second driver is transmission-connected to the suction cup, the suction cup is rotatably connected to the carrying mechanism, and the suction cup is used to adsorb the electrode piece to be tested; under the drive of the second driver, the suction cup can flip the electrode piece to be tested.

[0006] In the above scheme, the image processing unit in the image recognition mechanism can determine whether the crease is light-transmitting based on the image captured by the image acquisition unit, thereby reducing the human error caused by determining whether the crease is light-transmitting by the human eye, improving the accuracy of determining whether the crease is light-transmitting, and improving the accuracy of the electrode flexibility test results, so that the flexibility of the electrode used in the battery device can be effectively controlled, which helps to improve the reliability of the electrode used in the battery device; the flipping mechanism can flip the electrode to be tested to alternately change the folding direction of the electrode to be tested.

[0007] According to the pole piece flexibility testing device provided in some embodiments of the present application, the folding mechanism includes a first connecting rod, a first driver and a first connecting member, the first connecting member is connected to the first connecting rod, the first connecting member is used for connecting with the pole piece to be tested, the first connecting rod is rotatably connected to the supporting mechanism, and the first driver is transmission-connected to the first connecting rod; under the drive of the first driver, the first connecting rod and the first connecting member can fold the pole piece to be tested or unfold the folded pole piece to be tested.

[0008] According to the pole piece flexibility testing device provided in some embodiments of the present application, the folding mechanism also includes a rotating shaft, a second connecting rod, a second driver and a second connecting member, the second connecting member is connected to the second connecting rod, the first connecting rod and the second connecting rod are rotatably connected to the supporting mechanism through the rotating shaft, the second driver is transmission-connected to the second connecting rod, the first connecting member and the second connecting member are used to be respectively connected to the opposite ends of the pole piece to be tested, and under the drive of the first driver and the second driver, the first connecting member, the first connecting rod, the second connecting member and the second connecting rod can fold the pole piece to be tested or unfold the folded pole piece to be tested.

[0009] According to the electrode piece flexibility testing device provided in some embodiments of the present application, in a direction perpendicular to the surface of the carrying platform on which the electrode piece to be tested is placed, the image acquisition unit is arranged on a side of the electrode piece to be tested away from the carrying platform, and the image acquisition unit is arranged opposite to the rotating shaft. By arranging the image acquisition unit and the rotating shaft relatively spaced apart in a direction perpendicular to the surface of the carrying platform on which the electrode piece to be tested is placed, the image acquisition unit can achieve good correspondence with the fold of the electrode piece to be tested, which is conducive to improving the quality of the image acquired by the image acquisition unit.

[0010] According to the electrode flexibility testing device provided by some embodiments of the present application, the surface of the supporting platform for placing the electrode to be tested is recessed inward to form an avoidance groove, and the avoidance groove can accommodate at least a portion of the first connecting member, thereby reducing the possibility that a portion of the first connecting member is clamped between the surface of the supporting platform for placing the electrode to be tested and the electrode to be tested, and reducing the possibility that the electrode to be tested is supported by the first connecting member and is difficult to flatten.

[0011] According to the pole piece flexibility testing device provided in some embodiments of the present application, the flipping mechanism also includes a flipping axis, the suction cup is rotatably connected to the supporting mechanism through the flipping axis, and the second driver is transmission-connected to the flipping axis; the supporting platform includes a first platform and a second platform which are relatively arranged on both sides of the flipping axis along the radial direction of the flipping axis; under the drive of the second driver, the suction cup can flip the pole piece to be tested on the first platform to the second platform or flip the pole piece to be tested on the second platform to the first platform, so that the two side surfaces of the pole piece to be tested can alternately face the surface of the supporting platform for placing the pole piece to be tested, which is convenient for the subsequent alternating change of the folding direction of the pole piece to be tested.

[0012] According to the electrode flexibility testing device provided by some embodiments of the present application, the surface of the second platform for placing the electrode to be tested is recessed inward to form a receiving groove, and the receiving groove is connected to the gap between the first platform and the second platform. The receiving groove is used to accommodate at least part of the suction cup, thereby reducing the possibility that part of the suction cup is clamped between the surface of the second platform for placing the electrode to be tested and the electrode to be tested, and reducing the possibility that the electrode to be tested is supported by the suction cup and is difficult to flatten.

[0013] According to the electrode flexibility testing device provided in some embodiments of the present application, the flip mechanism further includes a telescopic rod, the telescopic rod extends in a direction perpendicular to the surface of the carrying platform on which the electrode to be tested is placed, the fixed end of the telescopic rod is connected to the carrying mechanism, and the flip shaft is rotatably connected to the telescopic end of the telescopic rod. The extension and retraction of the telescopic rod can drive the flip shaft to move, so that the suction cup can drive the electrode to be tested away from or close to the surface of the carrying platform on which the electrode to be tested is placed.

[0014] According to the electrode piece flexibility testing device provided in some embodiments of the present application, the rolling mechanism includes a crane and a pressure roller connected to the crane, the crane is connected to the bearing mechanism, and driven by the crane, the pressure roller can roll the electrode piece to be tested after being folded in half. By connecting the pressure roller to the crane and using the crane to drive the pressure roller to roll the electrode piece to be tested, the pressure roller can roll the electrode piece to be tested from above the electrode piece to be tested by using its own gravity, which is conducive to improving the stability of the force acting on the electrode piece to be tested, and is conducive to keeping the rolling effect on the electrode piece to be tested consistent each time.

[0015] According to the electrode flexibility testing device provided in some embodiments of the present application, the carrying platform is provided with a positioning block, which protrudes from the surface of the carrying platform where the electrode to be tested is placed. This not only enables the electrode to be tested placed on the surface of the carrying platform to be blocked by the positioning block and the movement of the electrode to be tested can be restricted by the positioning block, but also enables the electrode to be tested to be conveniently placed at a designated position on the carrying platform by abutting against the positioning block when placed on the carrying platform.

[0016] According to the pole piece flexibility testing device provided in some embodiments of the present application, the image recognition mechanism also includes a light-emitting unit, which is arranged on a side of the pole piece to be tested close to the supporting platform, and the light-emitting unit is used to emit light to the pole piece to be tested, so that the light-transmitting portion on the pole piece to be tested can be more easily identified.

[0017] According to the pole piece flexibility testing device provided in some embodiments of the present application, the luminous flux of the light-emitting unit is set to D, where D≥500lm.

[0018] In a second aspect, some embodiments of the present application provide a battery device production system, which includes a pole piece flexibility testing device provided by any of the above-mentioned technical solutions.

[0019] In a third aspect, some embodiments of the present application provide a method for testing the flexibility of a pole piece, wherein the method uses a pole piece flexibility testing device provided by any of the above technical solutions to test the flexibility of a pole piece to be tested, and the pole piece flexibility testing method includes: Place the electrode to be tested on the carrying platform of the electrode flexibility testing device; Fold the electrode to be tested in half using the folding mechanism of the electrode flexibility testing device; The pole piece to be tested is rolled by a rolling mechanism of the pole piece flexibility testing device to form a crease on the pole piece to be tested; The folded electrode to be tested is unfolded by the folding mechanism, and the image recognition mechanism of the electrode flexibility testing device collects the image of the fold through the image collection unit; The image processing unit of the image recognition mechanism determines whether the crease is light-transmissive based on the image. If the crease is light-transmissive, the number of times the electrode to be tested is folded is recorded; if the crease is not light-transmissive, the process returns to execute the folding mechanism of the electrode flexibility testing device to fold the electrode to be tested.

[0020] According to the pole piece flexibility testing method provided in some embodiments of the present application, a pole piece to be tested is rolled by a rolling mechanism of a pole piece flexibility testing device to form a crease on the pole piece to be tested, including: The pole piece to be tested is rolled from the bent portion of the pole piece to be tested in a direction away from the bent portion by using a rolling mechanism.

[0021] According to the electrode flexibility testing method provided in some embodiments of the present application, the electrode to be tested is unfolded after being folded in half by a folding mechanism, and the image recognition mechanism of the electrode flexibility testing device collects an image at the fold through an image acquisition unit, including: When the folded electrode to be tested is unfolded by the folding mechanism, the image acquisition unit continuously acquires images at the fold.

[0022] According to the pole piece flexibility testing method provided by some embodiments of the present application, when the fold is opaque, before returning to the step of folding the pole piece to be tested in half using the folding mechanism of the pole piece flexibility testing device, the pole piece flexibility testing method further includes: Turn over the electrode to be tested.

[0023] The technical solutions provided by the embodiments disclosed in this application bring at least the following beneficial effects: Some embodiments of the present application provide a pole piece flexibility testing device, which includes a bearing mechanism, a folding mechanism, a rolling mechanism, an image recognition mechanism and a flipping mechanism, wherein the bearing mechanism includes a bearing platform, and the bearing platform is used to place the pole piece to be tested; the folding mechanism can fold the pole piece to be tested in half, and unfold the folded pole piece to be tested; the rolling mechanism is arranged on the side of the pole piece to be tested away from the bearing platform, and the rolling mechanism is used to roll the folded pole piece to be tested to form a crease; the image recognition mechanism includes an image acquisition unit and an image processing unit, the image acquisition unit is used to acquire an image at the crease, the image processing unit is communicatively connected to the image acquisition unit, and the image processing unit is used to determine whether the crease is light-transmissive according to the image; the flipping mechanism includes a suction cup and a second driver, the second driver is transmission-connected to the suction cup, the suction cup is rotatably connected to the bearing mechanism, and the suction cup is used to adsorb the pole piece to be tested; under the drive of the second driver, the suction cup can flip the pole piece to be tested. In the above scheme, the image processing unit in the image recognition mechanism can determine whether the crease is light-transmitting based on the image captured by the image acquisition unit, thereby reducing the human error caused by determining whether the crease is light-transmitting by the human eye, improving the accuracy of determining whether the crease is light-transmitting, and improving the accuracy of the electrode flexibility test results, so that the flexibility of the electrode used in the battery device can be effectively controlled, which helps to improve the reliability of the electrode used in the battery device; the flipping mechanism can flip the electrode to be tested to alternately change the folding direction of the electrode to be tested.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0026] Figure 1A schematic diagram of the structure of a pole piece flexibility testing device provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of the electrode flexibility testing device provided in some embodiments of the present application after the electrode to be tested is folded in half; Figure 3 A partial structural schematic diagram of a pole piece flexibility testing device provided in some embodiments of the present application; Figure 4 for Figure 3 Enlarged view of point E in the middle; Figure 5 for Figure 3 The enlarged view of F in the middle; Figure 6 A flow chart of a pole piece flexibility testing method provided in some embodiments of the present application.

[0027] In the attached picture: 1. Carrying mechanism; 11. Carrying platform; 110. Avoidance groove; 111. First platform; 112. Second platform; 1121. Accommodating groove; 113. Positioning block; 2. Folding mechanism; 21. First connecting rod; 22. First driver; 23. First connecting piece; 25. Second connecting rod; 26. Second driver; 27. Second connecting piece; 3. Rolling mechanism; 31. Traveling crane; 32. Pressing roller; 4. Image acquisition unit; 5. Turning mechanism; 51. Suction cup; 53. Turning axis; 54. Telescopic rod; 6. Light-emitting unit; 10. Pole piece to be tested. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0030] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power supply systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in battery cells such as energy storage containers or energy storage cabinets. People's requirements for the capacity of battery devices are also constantly increasing.

[0035] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0036] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0037] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0038] The battery cells may be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0039] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0040] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0041] The positive and negative electrodes in the electrode assembly are usually formed by cutting the corresponding polarity pole pieces, so the performance of the pole pieces has a very important influence on the performance of the battery device. Among them, pole pieces with good flexibility can not only effectively reduce the possibility of pole piece breaking during rolling, but also reduce the possibility of inner ring breaking after winding and hot pressing, which has a very important influence on the long cycle and safety of the battery device, so the flexibility test of the pole piece is of great significance.

[0042] In some cases, the flexibility of the electrode is determined by repeatedly folding the electrode in half and rolling it, and observing whether the crease of the electrode is light-transmissive after unfolding. The number of times the electrode is folded in half when the crease of the electrode is light-transmissive is used as an indicator to evaluate the flexibility of the electrode. In this process, since the judgment of whether the crease of the electrode is light-transmissive is made by manual visual judgment, the difference in human eyes brings about human errors, which is not conducive to the accuracy of the electrode flexibility test results.

[0043] In order to improve the accuracy of the test results of the flexibility of the electrode, some embodiments of the present application provide a pole piece flexibility test device, which includes a bearing mechanism, a folding mechanism, a rolling mechanism, an image recognition mechanism and a flipping mechanism. The bearing mechanism includes a bearing platform, and the bearing platform is used to place the pole piece to be tested; the folding mechanism can fold the pole piece to be tested in half, and unfold the folded pole piece to be tested; the rolling mechanism is arranged on the side of the pole piece to be tested away from the bearing platform, and the rolling mechanism is used to roll the folded pole piece to be tested to form a crease; the image recognition mechanism includes an image acquisition unit and an image processing unit, the image acquisition unit is used to acquire an image at the crease, the image processing unit is communicatively connected to the image acquisition unit, and the image processing unit is used to determine whether the crease is light-transmissive according to the image; the flipping mechanism includes a suction cup and a second driver, the second driver is transmission-connected to the suction cup, the suction cup is rotatably connected to the bearing mechanism, and the suction cup is used to adsorb the pole piece to be tested; under the drive of the second driver, the suction cup can flip the pole piece to be tested. In the above scheme, the image processing unit in the image recognition mechanism can determine whether the crease is light-transmitting based on the image captured by the image acquisition unit, thereby reducing the human error caused by determining whether the crease is light-transmitting by the human eye, improving the accuracy of determining whether the crease is light-transmitting, and improving the accuracy of the electrode flexibility test results, so that the flexibility of the electrode used in the battery device can be effectively controlled, which helps to improve the reliability of the electrode used in the battery device; the flipping mechanism can flip the electrode to be tested to alternately change the folding direction of the electrode to be tested.

[0044] The pole piece flexibility testing device disclosed in the embodiment of the present application can be used to perform flexibility testing on the pole pieces of a battery device, and can also be used to perform flexibility testing on the isolation pieces of a battery device. The pole piece flexibility testing device can reduce the human error caused by determining whether light is transmitted through the human eye at the crease, and can improve the accuracy of the isolation piece flexibility test results.

[0045] Of course, the pole piece flexibility testing device of the embodiment of the present application can also be used to perform flexibility testing on other sheet materials.

[0046] The following is a further description of the technical solutions for the pole piece flexibility testing device, testing method and battery device production system provided in the specific implementation manner of the present application.

[0047] Some embodiments of the present application provide a pole piece flexibility testing device, such as Figure 1As shown, the electrode flexibility testing device includes a bearing mechanism 1, a folding mechanism 2, a rolling mechanism 3 and an image recognition mechanism, the bearing mechanism 1 includes a bearing platform 11, the bearing platform 11 is used to place the electrode 10 to be tested; the folding mechanism 2 is connected to the bearing mechanism 1, the folding mechanism 2 can fold the electrode 10 to be tested in half, and unfold the folded electrode 10 to be tested; the rolling mechanism 3 is connected to the bearing mechanism 1; in a direction perpendicular to the surface of the bearing platform 11 on which the electrode 10 to be tested is placed, the rolling mechanism 3 is arranged on the side of the electrode 10 to be tested away from the bearing platform 11, the rolling mechanism 3 is used to roll the folded electrode 10 to be tested to form a crease; the image recognition mechanism includes an image acquisition unit 4 and an image processing unit, the image acquisition unit 4 is used to acquire an image at the crease, the image processing unit is communicatively connected to the image acquisition unit 4, and the image processing unit is used to determine whether the crease is light-transmissive according to the image.

[0048] The bearing mechanism 1 may be a mechanism for bearing and setting other mechanisms in the pole piece flexibility test device, which can connect other mechanisms in the pole piece flexibility test device into an integral structure and provide a placement position for placing the pole piece. The bearing platform 11 may be a mechanism for bearing and placing the pole piece in the bearing mechanism 1. After the pole piece 10 to be tested is placed on the bearing platform 11, the pole piece 10 to be tested can be conveniently folded in half, rolled, and the like.

[0049] The folding mechanism 2 can be a mechanism for folding the electrode piece 10 to be tested placed on the carrying platform 11 and unfolding the folded electrode piece 10 to be tested. Figure 2 As shown, it is convenient to form a fold on the electrode piece 10 to be tested later, and the folded electrode piece 10 to be tested can also be unfolded to facilitate observation or judgment of the light transmission at the fold. By connecting the folding mechanism 2 to the carrying mechanism 1, the folding mechanism 2 can transfer the load received to the carrying mechanism 1, so that the folding mechanism 2 can stably fold the electrode piece 10 to be tested on the carrying platform 11 or unfold the folded electrode piece 10 to be tested.

[0050] The rolling mechanism 3 may be a mechanism for rolling the folded electrode piece 10 to be tested. By rolling the electrode piece 10 to be tested placed on the carrying platform 11, the two parts of the folded electrode piece 10 to be tested can be fitted to each other, so that the folded electrode piece 10 to be tested is pressed, and the electrode piece 10 to be tested is completely folded in half, so as to form a crease on the folded electrode piece 10 to be tested. By connecting the rolling mechanism 3 to the carrying mechanism 1, the rolling mechanism 3 can transfer the load received to the carrying mechanism 1, so that the rolling mechanism 3 can remain stable, so that the rolling mechanism 3 can stably roll the electrode piece 10 to be tested placed on the carrying platform 11.

[0051] By arranging the rolling mechanism 3 on the side of the electrode piece 10 to be tested away from the carrying platform 11 in a direction perpendicular to the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed, the rolling mechanism 3 can apply a force to the electrode piece 10 to be tested located on the carrying platform 11, and the electrode piece 10 to be tested is rolled on the carrying platform 11. Exemplarily, the electrode piece 10 to be tested placed on the carrying platform 11 can be rolled by the gravity of the roller in the rolling mechanism 3 itself, and the electrode piece 10 to be tested placed on the carrying platform 11 can also be rolled by the gravity of the roller in the rolling mechanism 3 itself and the additional force applied by the rolling mechanism 3.

[0052] The image recognition mechanism may be a mechanism for determining whether the electrode piece 10 to be tested is light-transmissive, so that the flexibility of the electrode piece 10 to be tested can be evaluated by the number of times the electrode piece 10 to be tested is folded when it is light-transmissive. The image acquisition unit 4 may be a device for acquiring an image of the electrode piece 10 to be tested on the carrying platform 11, which is arranged on the carrying mechanism 1 so that the load of the image acquisition unit 4 can be transferred to the carrying mechanism 1, so that the image acquisition unit 4 can remain stable, so that the image acquisition unit 4 can stably acquire the image of the electrode piece 10 to be tested on the carrying platform 11. Exemplarily, the image acquisition unit 4 may be arranged at a relative interval to the carrying platform 11, and the image acquisition unit 4 is arranged on a side of the electrode piece 10 to be tested that is away from the carrying platform 11 in a direction perpendicular to the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed, and can acquire an image of the fold of the electrode piece 10 to be tested placed on the carrying platform 11.

[0053] Exemplarily, the image acquisition unit 4 may include a charge coupled device (CCD) image acquisition unit 4. The CCD image acquisition unit 4 has the advantages of high sensitivity, resistance to strong light, and small distortion. It is beneficial to improve the quality of the image obtained at the crease of the electrode piece 10 to be tested, and is beneficial to improve the accuracy of the image processing unit in determining whether the crease is light transmissive.

[0054] The pixel value range of the image acquisition unit 4 can be set to 30 million to 60 million, so that the image acquired by the image acquisition unit 4 has a higher definition. Exemplarily, the pixel value of the image acquisition unit 4 can be set to 40 million, 50 million or 60 million, and those skilled in the art can set the pixel value of the image acquisition unit 4 according to actual conditions. Exemplarily, the pixel value range of the image acquisition unit 4 can be set to 40 million to 50 million, which not only makes the image acquired by the image acquisition unit 4 have a higher definition, but also can reduce the cost increase caused by using too high a pixel value of the image acquisition unit 4.

[0055] The image processing unit can be an industrial control computer, which can perform numerical calculations, logical calculations, and storage and memory functions. The image processing unit can store and run a corresponding recognition program for determining whether there is a light-transmitting area in the image, so as to determine whether the fold is light-transmitting according to the image, so that the staff can evaluate the flexibility of the electrode piece 10 to be tested according to the number of folds to be applied when light is transmitted at the fold.

[0056] The image processing unit is connected to the image acquisition unit 4 by communication, so that the image of the fold captured by the image acquisition unit 4 can be transmitted to the image processing unit, so that the image processing unit can recognize and process the image using a corresponding recognition program.

[0057] In the above scheme, the image processing unit in the image recognition mechanism can determine whether the crease is light-transmitting based on the image captured by the image acquisition unit 4, thereby reducing the human error caused by determining whether the crease is light-transmitting by the human eye, improving the accuracy of determining whether the crease is light-transmitting, and improving the accuracy of the electrode flexibility test results, so that the flexibility of the electrode used in the battery device can be effectively controlled, which helps to improve the reliability of the electrode used in the battery device.

[0058] In some embodiments, the folding mechanism 2 includes a first connecting rod 21, a first driver 22 and a first connecting member 23, the first connecting member 23 is connected to the first connecting rod 21, the first connecting member 23 is used to connect with the electrode piece 10 to be tested, the first connecting rod 21 is rotatably connected to the supporting mechanism 1, and the first driver 22 is transmission-connected to the first connecting rod 21; under the drive of the first driver 22, the first connecting rod 21 and the first connecting member 23 can fold the electrode piece 10 to be tested or unfold the folded electrode piece 10 to be tested.

[0059] The first connecting member 23 can be a device in the folding mechanism 2 for connecting with the electrode piece 10 to be tested, and is used to connect the folding mechanism 2 with the electrode piece 10 to be tested so that the folding mechanism 2 can apply force to the electrode piece 10 to be tested, thereby folding the electrode piece 10 to be tested in half.

[0060] In some embodiments, the first connecting member 23 can be detachably connected to the electrode piece 10 to be tested, so that the electrode piece 10 to be tested in the electrode piece flexibility testing device can be easily replaced; the first connecting member 23 can also be fixedly connected to the electrode piece 10 to be tested, so that the connection between the first connecting member 23 and the electrode piece 10 to be tested is firm and not easy to disengage.

[0061] Exemplarily, the first connecting member 23 may include a spring clip, which can be connected to the electrode piece 10 by clamping the electrode piece 10. Since the spring clip can be easily disassembled from the electrode piece 10 to be tested, the electrode piece 10 to be tested can be easily taken and placed in the folding mechanism 2, which is conducive to improving the convenience of the staff in operating the electrode piece flexibility testing device.

[0062] The first connecting rod 21 may be a rod-shaped device in the folding mechanism 2, the first connecting member 23 is connected to the first connecting rod 21, and the first driver 22 is in transmission connection with the first connecting rod 21, which is used to transmit the driving force of the first driver 22 to the electrode piece 10 to be tested, so that the folding mechanism 2 can fold the electrode piece 10 to be tested. By rotatably connecting the first connecting rod 21 to the bearing mechanism 1, the first connecting rod 21 is driven by the first driver 22 to rotate, and the first connecting member 23 is also driven by the first connecting rod 21 to rotate, so that the first connecting rod 21 and the first connecting member 23 can bend the electrode piece 10 to be tested to achieve folding or unfold the folded electrode piece 10 to be tested.

[0063] The first driver 22 may be a driver for driving the first connecting rod 21 to rotate, and it provides driving force for the folding mechanism 2 to fold and unfold the electrode piece 10 to be tested. Exemplarily, the first driver 22 may be a servo motor, and the rotation angle of the servo motor is accurately controlled, so that under the drive of the first driver 22, the electrode piece 10 to be tested can be accurately folded and accurately flattened.

[0064] Driven by the first driver 22 , the first connecting member 23 can bend the electrode piece 10 to be tested by rotating so as to fold it in half, and can also unfold the folded electrode piece 10 to be tested by rotating so as to collect an image at the fold.

[0065] In some embodiments, reference Figure 3 to Figure 4 The folding mechanism 2 also includes a rotating shaft, a second connecting rod 25, a second driver 26 and a second connecting member 27. The second connecting member 27 is connected to the second connecting rod 25. The first connecting rod 21 and the second connecting rod 25 are rotatably connected to the supporting mechanism 1 through a rotating shaft. The second driver 26 is transmission-connected to the second connecting rod 25. The first connecting member 23 and the second connecting member 27 are used to be respectively connected to the opposite ends of the electrode piece 10 to be tested. Under the drive of the first driver 22 and the second driver 26, the first connecting member 23, the first connecting rod 21, the second connecting member 27 and the second connecting rod 25 can fold the electrode piece 10 to be tested or unfold the folded electrode piece 10 to be tested.

[0066] The second connecting member 27 can be a device in the folding mechanism 2 for connecting with the electrode piece 10 to be tested, and is used to connect the folding mechanism 2 with the electrode piece 10 to be tested. The second connecting member 27 is connected to the opposite ends of the electrode piece 10 to be tested by the first connecting member 23, respectively, so that the folding mechanism 2 can apply a force to the two parts of the electrode piece 10 to be tested, thereby folding the electrode piece 10 to be tested.

[0067] The rotating shaft can be an axis-like component connecting the first connecting rod 21 and the second connecting rod 25, which can be rotatably connected to the supporting mechanism 1, so that the first connecting rod 21 and the second connecting rod 25 can be rotatably connected to the supporting mechanism 1 through the rotating shaft, so that the first connecting rod 21 and the second connecting rod 25 can rotate relative to the supporting mechanism 1 around the same rotation center.

[0068] Exemplarily, the second connecting member 27 may fix the end of the electrode piece 10 to be tested connected thereto, and the first connecting member 23 may drive the end of the electrode piece 10 to be tested connected thereto to rotate around the rotating axis through 180°, so that the two parts of the electrode piece 10 to be tested are folded in half; or the first connecting member 23 may fix the end of the electrode piece 10 to be tested connected thereto, and the second connecting member 27 may drive the end of the electrode piece 10 to be tested connected thereto to rotate around the rotating axis through 180°, so that the two parts of the electrode piece 10 to be tested are folded in half.

[0069] In some embodiments, the second connecting member 27 can be detachably connected to the electrode piece 10 to be tested, so that the electrode piece 10 to be tested in the electrode piece flexibility testing device can be easily replaced; the second connecting member 27 can also be fixedly connected to the electrode piece 10 to be tested, so that the connection between the first connecting member 23 and the electrode piece 10 to be tested is firm and not easy to disengage.

[0070] Exemplarily, the second connecting member 27 may include a spring clip, which can be connected to the electrode piece 10 by clamping the electrode piece 10. Since the spring clip can be easily disassembled from the electrode piece 10 to be tested, the electrode piece 10 to be tested can be easily taken and placed in the folding mechanism 2, which is conducive to improving the convenience of the staff in operating the electrode piece flexibility testing device.

[0071] The second connecting rod 25 can be a rod-shaped device in the folding mechanism 2, the second connecting member 27 is connected to the second connecting rod 25, and the second driver 26 is transmission-connected to the second connecting rod 25, which is used to transmit the driving force of the second driver 26 to the pole piece 10 to be tested, so that the second driver 26 can drive part of the pole piece 10 to be tested to bend, thereby realizing the folding of the pole piece 10 to be tested, or unfolding the folded pole piece 10 to be tested.

[0072] The second driver 26 may be a driver for driving the second connecting rod 25 to rotate, and it provides driving force for the folding mechanism 2 to fold and unfold the electrode piece 10 to be tested. Exemplarily, the second driver 26 may be a servo motor, and the rotation angle of the servo motor is accurately controlled, so that under the drive of the second driver 26, the electrode piece 10 to be tested can be folded more accurately and can be flattened more accurately.

[0073] In some embodiments, in a direction perpendicular to the surface of the carrying platform 11 on which the pole piece 10 to be tested is placed, the image acquisition unit 4 is disposed on a side of the pole piece 10 to be tested away from the carrying platform 11 , and the image acquisition unit 4 is disposed opposite to the rotating shaft.

[0074] By arranging the image acquisition unit 4 on a side of the pole piece 10 to be tested that is away from the carrying platform 11 in a direction perpendicular to the surface of the carrying platform 11 on which the pole piece 10 to be tested is placed, the carrying platform 11 is less likely to affect the image acquisition by the image acquisition unit 4, and the image acquisition unit 4 can capture images of the pole piece 10 to be tested placed on the carrying platform 11.

[0075] Since the first connecting rod 21 and the second connecting rod 25 are both rotatably connected to the bearing mechanism 1 through the rotating shaft, the fold of the electrode piece 10 to be tested appears at a position corresponding to the rotating shaft. By relatively spacing the image acquisition unit 4 and the rotating shaft in a direction perpendicular to the surface of the bearing platform 11 on which the electrode piece 10 to be tested is placed, the image acquisition unit 4 can achieve good correspondence with the fold of the electrode piece 10 to be tested, which is conducive to improving the quality of the image acquired by the image acquisition unit 4.

[0076] In some embodiments, the surface of the carrying platform 11 for placing the electrode piece 10 to be tested is recessed inward to form an escape groove 110 , and the escape groove 110 can accommodate at least a portion of the first connecting member 23 .

[0077] The avoidance groove 110 may be a groove-shaped structure for avoiding the first connector 23. The avoidance groove 110 is formed by making the surface of the carrying platform 11 for placing the electrode piece 10 to be tested concave inward, so that when the first connector 23 is connected to the electrode piece 10 to be tested, the part of the first connector 23 located between the electrode piece 10 to be tested and the carrying platform 11 can be accommodated by the avoidance groove 110, reducing the possibility that the part of the first connector 23 is clamped between the surface of the carrying platform 11 for placing the electrode piece 10 to be tested and the electrode piece 10 to be tested, and reducing the possibility that the electrode piece 10 to be tested is supported by the first connector 23 and is not easy to flatten.

[0078] In some embodiments, the pole piece flexibility testing device also includes a flipping mechanism 5, which includes a suction cup 51 and a second driver 26, the second driver 26 is transmission-connected to the suction cup 51, the suction cup 51 is rotatably connected to the supporting mechanism 1, and the suction cup 51 is used to adsorb the pole piece 10 to be tested; under the drive of the second driver 26, the suction cup 51 can flip the pole piece 10 to be tested.

[0079] The flipping mechanism 5 can be a mechanism for flipping the electrode piece 10 to be tested. It can flip the electrode piece 10 to be tested so that the two side surfaces of the electrode piece 10 to be tested alternately face the surface of the supporting platform 11 for placing the electrode piece 10 to be tested, thereby realizing the alternating change of the folding direction of the electrode piece 10 to be tested.

[0080] The suction cup 51 can be used to absorb the surface of the electrode piece 10 to be tested, and it serves as a device connected to the electrode piece 10 to be tested in the flipping mechanism 5. By rotatably connecting the suction cup 51 to the carrying mechanism 1, the suction cup 51 can drive the electrode piece 10 to be tested to flip by rotating, so that the two side surfaces of the electrode piece 10 to be tested can alternately face the surface of the carrying platform 11 for placing the electrode piece 10 to be tested, so as to realize the alternating change of the folding direction of the electrode piece 10 to be tested.

[0081] The second driver 26 may be a driver for driving the suction cup 51 to move, which is in transmission connection with the suction cup 51 and can drive the suction cup 51 to rotate back and forth relative to the supporting mechanism 1, so as to flip the pole piece 10 to be tested. Exemplarily, the second driver 26 may be a servo motor, and the rotation angle of the servo motor is accurately controlled, so that under the drive of the second driver 26, the pole piece 10 to be tested can be accurately flipped 180°, so that the two sides of the pole piece 10 to be tested can alternately face the surface of the supporting platform 11 for placing the pole piece 10 to be tested.

[0082] In some embodiments, reference Figure 3 and Figure 5 The flipping mechanism 5 also includes a flipping shaft 53, the suction cup 51 is rotatably connected to the carrying mechanism 1 through the flipping shaft 53, and the second driver 26 is transmission-connected to the flipping shaft 53; the carrying platform 11 includes a first platform 111 and a second platform 112 which are relatively arranged on both sides of the flipping shaft 53 along the radial direction of the flipping shaft 53; under the drive of the second driver 26, the suction cup 51 can flip the pole piece 10 to be tested on the first platform 111 to the second platform 112 or flip the pole piece 10 to be tested on the second platform 112 to the first platform 111.

[0083] The flip axis 53 may be an axis-like component connected to the suction cup 51, which is rotatably connected to the bearing mechanism 1, so that the suction cup 51 can rotate around the flip axis 53. The first platform 111 and the second platform 112 are two platform structures arranged relatively spaced apart in the bearing platform 11, respectively. The two are arranged relatively on both sides of the flip axis 53 along the radial direction of the flip axis 53, so that when the electrode piece 10 to be tested is flipped 180° under the drive of the suction cup 51, it can be flipped from the first platform 111 to the second platform 112 or from the second platform 112 to the first platform 111, and at the same time, the two side surfaces of the electrode piece 10 to be tested can alternately face the surface of the bearing platform 11 for placing the electrode piece 10 to be tested, so as to facilitate the subsequent alternating change of the folding direction of the electrode piece 10 to be tested.

[0084] Driven by the second driver 26, the suction cup 51 can flip the electrode piece 10 to be tested on the first platform 111 by 180° and flip it onto the second platform 112, or flip the electrode piece 10 to be tested on the second platform 112 by 180° and flip it onto the first platform 111, so that the two side surfaces of the electrode piece 10 to be tested are alternately facing the supporting platform 11, which is convenient for the subsequent alternating change of the folding direction of the electrode piece 10 to be tested.

[0085] In some embodiments, the surface of the second platform 112 for placing the electrode piece 10 to be tested is recessed inward to form a receiving groove 1121 , which is connected to the gap between the first platform 111 and the second platform 112 , and is used to receive at least part of the suction cup 51 .

[0086] The receiving groove 1121 may be a groove-shaped structure for avoiding the suction cup 51. The receiving groove 1121 is formed by making the surface of the second platform 112 for placing the electrode piece 10 to be tested concave inward, and the receiving groove 1121 is connected with the gap between the first platform 111 and the second platform 112, so that after the electrode piece 10 to be tested is adsorbed from the first platform 111, at least part of the suction cup 51 can enter the receiving groove 1121 by rotation and be accommodated in the receiving groove 1121, which reduces the possibility that part of the suction cup 51 is sandwiched between the surface of the second platform 112 for placing the electrode piece 10 to be tested and the electrode piece 10 to be tested, and reduces the possibility that the electrode piece 10 to be tested is supported by the suction cup 51 and is not easy to flatten.

[0087] In some embodiments, the flipping mechanism 5 also includes a telescopic rod 54, which extends in a direction perpendicular to the surface of the supporting platform 11 on which the electrode 10 to be tested is placed. The fixed end of the telescopic rod 54 is connected to the supporting mechanism 1, and the flipping axis 53 is rotatably connected to the telescopic end of the telescopic rod 54.

[0088] The telescopic rod 54 may be a rod-shaped device that can be extended or shortened. By connecting the fixed end of the telescopic rod 54 to the carrying mechanism 1, rotatably connecting the flip shaft 53 to the telescopic end of the telescopic rod 54, and extending the telescopic rod 54 in a direction perpendicular to the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed, the telescopic rod 54 can drive the flip shaft 53 to reciprocate in a direction perpendicular to the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed.

[0089] The extension and retraction of the telescopic rod 54 can drive the flip shaft 53 to move, so that the suction cup 51 can drive the electrode piece 10 to be tested to move away from or approach the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed.

[0090] It can be that after the suction cup 51 adsorbs the electrode piece 10 to be tested located on the first platform 111, the telescopic rod 54 is first extended, and the electrode piece 10 to be tested is driven away from the first platform 111 by driving the flip axis 53 and the suction cup 51 away from the first platform 111, and then the flip axis 53 rotates to flip the electrode piece 10 to be tested 180° by driving the suction cup 51 to flip, and the electrode piece 10 to be tested is flipped from the first platform 111 to the upper side of the second platform 112, and then the telescopic rod 54 is shortened, and the suction cup 51 places the electrode piece 10 to be tested on the surface of the second platform 112.

[0091] In some embodiments, the rolling mechanism 3 includes a crane 31 and a pressure roller 32 connected to the crane 31 . The crane 31 is connected to the supporting mechanism 1 . Driven by the crane 31 , the pressure roller 32 can roll the folded electrode 10 to be tested.

[0092] The pressure roller 32 may be a roller wheel used to roll the folded electrode piece 10 to be tested. The crane 31 may be a device used to suspend and move the pressure roller 32, which is connected to the bearing mechanism 1 and is used to drive the pressure roller 32 to roll the electrode piece 10 to be tested placed on the bearing platform 11. By connecting the pressure roller 32 to the crane 31 and using the crane 31 to drive the pressure roller 32 to roll the electrode piece 10 to be tested, the pressure roller 32 can roll the electrode piece 10 to be tested from above the electrode piece 10 by using its own gravity, which is beneficial to improving the stability of the force of rolling the electrode piece 10 to be tested, and is beneficial to keeping the rolling effect on the electrode piece 10 to be tested consistent each time.

[0093] Exemplarily, the pressure roller 32 is connected to the crane 31 via a connecting rope, so that the gravity of the pressure roller 32 can be applied relatively completely to the electrode piece 10 to be tested.

[0094] In some embodiments, the carrying platform 11 is provided with a positioning block 113 , and the positioning block 113 protrudes from the surface of the carrying platform 11 on which the electrode piece 10 to be tested is placed.

[0095] The positioning block 113 may be a structure for limiting the position of the electrode piece 10 to be tested on the carrying platform 11. By protruding the positioning block 113 on the surface of the carrying platform 11 where the electrode piece 10 to be tested is placed, not only the electrode piece 10 to be tested placed on the surface of the carrying platform 11 can be blocked by the positioning block 113, the movement of the electrode piece 10 to be tested can be limited by the positioning block 113, but also the electrode piece 10 to be tested can be conveniently placed at a designated position on the carrying platform 11 by abutting against the positioning block 113 when placed on the carrying platform 11.

[0096] In some embodiments, the image recognition mechanism further includes a light emitting unit 6 , which is disposed on a side of the electrode piece 10 to be tested close to the supporting platform 11 , and is used to emit light to the electrode piece 10 to be tested.

[0097] The light-emitting unit 6 may be an optical device for emitting light outward. The light-emitting unit 6 emits light to the electrode piece 10 to be tested, so that the light-transmitting portion on the electrode piece 10 to be tested can be more easily identified. By arranging the light-emitting unit 6 on the side of the electrode piece 10 to be tested close to the carrying platform 11, and arranging the image acquisition unit 4 on the side of the electrode piece 10 to be tested away from the carrying platform 11, the light emitted by the light-emitting unit 6 can better pass through the light-transmitting portion of the electrode piece 10 to be tested and appear in the image captured by the image acquisition unit 4.

[0098] Exemplarily, the light emitting unit 6 may include a lampshade and a light emitting diode, wherein the light emitting diode is disposed in the lampshade, and the opening of the lampshade faces the electrode piece 10 to be tested, for emitting light to the electrode piece 10 to be tested. In some embodiments, the light emitting unit 6 may be provided in plurality to emit light of sufficient intensity to the electrode piece 10 to be tested.

[0099] In some embodiments, the luminous flux of the light emitting unit 6 is set to D, where D≥500 lm.

[0100] By setting the range of the luminous flux D of the light emitting unit 6 to D≥500lm, the light emitting unit 6 can emit light of sufficient intensity to the electrode piece 10 to be tested, so that the light-transmitting portion in the image collected by the image acquisition unit 4 can be more easily identified. Exemplarily, the luminous flux D of the light emitting unit 6 can be set to 600lm, 700lm or 800lm, which not only makes it easier to identify the light-transmitting portion in the image collected by the image acquisition unit 4, but also reduces the cost increase caused by using too high a luminous flux of the light emitting unit 6.

[0101] Some embodiments of the present application also provide a battery device production system, which includes a pole piece flexibility testing device provided by any of the aforementioned embodiments.

[0102] Some embodiments of the present application also provide a method for testing the flexibility of a pole piece, wherein the method uses a pole piece flexibility testing device provided by any of the above technical solutions to test the flexibility of the pole piece 10 to be tested, referring to Figure 6 , the pole piece flexibility test method comprises the following steps: S1. Place the electrode 10 to be tested on the carrying platform 11 of the electrode flexibility testing device.

[0103] In the above step S1 , by placing the pole piece 10 to be tested on the carrying platform 11 of the pole piece flexibility testing device, the staff can use the pole piece flexibility testing device to perform a flexibility test on the pole piece 10 to be tested.

[0104] S2, folding the electrode 10 to be tested in half using the folding mechanism 2 of the electrode flexibility testing device.

[0105] In the above step S2, a part of the electrode piece 10 to be tested is bent relative to another part of the electrode piece 10 to be tested by using the folding mechanism 2 in the electrode piece flexibility testing device, so that the two parts of the electrode piece 10 to be tested can be folded together.

[0106] S3 , using the rolling mechanism 3 of the pole piece flexibility testing device to roll the pole piece 10 to be tested, so as to form a fold on the pole piece 10 to be tested.

[0107] In the above step S3, the electrode piece 10 to be tested is rolled by the rolling mechanism 3 in the electrode piece flexibility testing device, so that the two parts of the folded electrode piece 10 to be tested can be fitted together, so that the folded electrode piece 10 to be tested is pressed tightly, and the electrode piece 10 to be tested is completely folded, so that a crease is formed on the electrode piece 10 to be tested.

[0108] S4 , unfolding the folded electrode piece 10 to be tested through the folding mechanism 2 , and the image recognition mechanism of the electrode piece flexibility testing device collects the image of the fold through the image collection unit 4 .

[0109] In the above step S4, the folded electrode piece 10 to be tested is unfolded by using the folding mechanism 2, so that the fold on the electrode piece 10 to be tested can be better exposed, which is convenient for observing or judging the light transmission condition at the fold.

[0110] In the above step S4, the image recognition mechanism of the electrode flexibility testing device collects the image at the crease through the image acquisition unit 4. It can be that during the process of the folding mechanism 2 unfolding the folded electrode 10 to be tested, the image acquisition unit 4 in the image recognition mechanism continuously collects the image at the crease; it can also be that after the folding mechanism 2 unfolds the folded electrode 10 to be tested, the image acquisition unit 4 in the image recognition mechanism continuously collects the image at the crease; it can also be that during the process of the folding mechanism 2 unfolding the folded electrode 10 to be tested, the image acquisition unit 4 in the image recognition mechanism collects the image at the crease multiple times according to preset rules. For example, during the process of the folding mechanism 2 unfolding the folded electrode 10 to be tested, the image acquisition unit 4 in the image recognition mechanism collects the image at the crease once every time the two parts of the folded electrode 10 to be tested are opened 30°.

[0111] S5. The image processing unit of the image recognition mechanism determines whether the fold is light-transmissive based on the image. If the fold is light-transmissive, the number of times the electrode piece 10 to be tested is folded is recorded. If the fold is not light-transmissive, the process returns to execute the folding mechanism 2 of the electrode piece flexibility testing device to fold the electrode piece 10 to be tested.

[0112] In the above step S5, after the image processing unit of the image recognition mechanism obtains the image of the fold captured by the image acquisition unit 4, it can use the corresponding recognition program to determine whether the fold is light-transmissive based on the image. In the case that light is transmissive at the fold, the number of times the electrode piece 10 to be tested is folded is recorded. At this time, the number of times the electrode piece 10 to be tested is folded is an indicator for evaluating the flexibility of the electrode piece 10 to be tested. In the case that the fold is not light-transmissive, the process returns to step S2, that is, returns to the step of folding the electrode piece 10 to be tested in half using the folding mechanism 2 of the electrode piece flexibility test device.

[0113] In the above scheme, the electrode flexibility testing method utilizes the electrode flexibility testing device to continuously fold and roll the electrode 10 to be tested until the electrode 10 to be tested becomes light transmissive, and the number of times the electrode 10 to be tested is folded when the electrode 10 to be tested becomes light transmissive is used as an indicator for evaluating the flexibility of the electrode 10 to be tested.

[0114] In order to test the flexibility of the same batch of pole pieces, multiple (2 or more) pole pieces 10 to be tested can be randomly selected from the pole pieces in the batch, and the pole piece flexibility test method can be used to perform flexibility tests. If the average number of times the pole pieces 10 to be tested are folded when light is transmitted at the fold is at least 3 times, and the minimum number is at least 2 times, the flexibility of the pole pieces in the batch is determined to meet the requirements.

[0115] In some embodiments, the pole piece 10 to be tested is rolled by the rolling mechanism 3 of the pole piece flexibility testing device to form a crease on the pole piece 10 to be tested, including: using the rolling mechanism 3 to roll the pole piece 10 to be tested from the bent portion of the pole piece 10 to be tested in a direction away from the bent portion.

[0116] By making the aforementioned step S5 as follows, using the rolling mechanism 3 to roll the electrode piece 10 to be tested from the bent portion of the electrode piece 10 to be tested in a direction away from the bent portion, the rolling mechanism 3 rolls the electrode piece 10 to be tested starting from the bent portion of the electrode piece 10 to be tested after being folded in half each time and ending at the opening of the electrode piece 10 to be tested after being folded in half, it is helpful to reduce the situation where the creases of the previous fold and the next fold are inconsistent when the electrode piece 10 to be tested is folded in half.

[0117] In some embodiments, the folded electrode piece 10 to be tested is unfolded by the folding mechanism 2, and the image recognition mechanism of the electrode piece flexibility testing device collects the image at the crease through the image acquisition unit 4, including: in the process of unfolding the folded electrode piece 10 to be tested by the folding mechanism 2, the image acquisition unit 4 continuously collects the image at the crease.

[0118] By making the aforementioned step S4 such that, in the process of unfolding the folded electrode piece 10 to be tested by the folding mechanism 2, the image acquisition unit 4 continuously acquires the image at the fold, so that in the process of the angle between the two parts of the folded electrode piece 10 to be tested changing from 0° to 180°, the image acquisition unit 4 continuously acquires the image at the fold. As long as the image processing unit recognizes that light transmission occurs in the image at the fold continuously acquired by the image acquisition unit 4, light transmission at the fold can be determined.

[0119] In some embodiments, when the fold is opaque, before returning to the step of folding the electrode 10 to be tested in half using the folding mechanism 2 of the electrode flexibility testing device, the electrode flexibility testing method further includes: turning over the electrode 10 to be tested.

[0120] In some embodiments, in the electrode flexibility testing method, when the fold is opaque, before returning to step S2, the electrode 10 to be tested is flipped over so that the folding directions of the electrode 10 to be tested are alternately changed between the previous folding and the next folding.

[0121] Some embodiments of the present application provide a pole piece flexibility testing device, which includes a carrying mechanism 1, a folding mechanism 2, a rolling mechanism 3, an image recognition mechanism and a flipping mechanism 5, wherein the carrying mechanism 1 includes a carrying platform 11, and the carrying platform 11 is used to place the pole piece 10 to be tested; the folding mechanism 2 can fold the pole piece 10 to be tested in half, and unfold the folded pole piece 10 to be tested; the rolling mechanism 3 is arranged on the side of the pole piece 10 to be tested away from the carrying platform 11, and the rolling mechanism 3 is used to roll the folded pole piece 10 to be tested to form a crease; the image recognition mechanism includes an image acquisition unit 4 and an image processing unit, the image acquisition unit 4 is used to acquire an image at the crease, the image processing unit is communicated with the image acquisition unit 4, and the image processing unit is used to determine whether the crease is light-transmissive according to the image, and the suction cup 51 in the flipping mechanism 5 flips the pole piece 10 to be tested under the drive of the second driver 26, so that the folding direction of the pole piece 10 to be tested is alternately changed between the previous folding and the next folding.

[0122] In the above scheme, the image processing unit in the image recognition mechanism can determine whether the crease is light-transmitting based on the image captured by the image acquisition unit, thereby reducing the human error caused by determining whether the crease is light-transmitting by the human eye, improving the accuracy of determining whether the crease is light-transmitting, and improving the accuracy of the electrode flexibility test results, so that the flexibility of the electrode used in the battery device can be effectively controlled, which helps to improve the reliability of the electrode used in the battery device.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece flexibility testing device, characterized in that: include: The bearing mechanism comprises a bearing platform, and the bearing platform is used to place the electrode to be tested; A folding mechanism, connected to the carrying mechanism, capable of folding the electrode piece to be tested in half and unfolding the folded electrode piece to be tested; A rolling mechanism connected to the bearing mechanism; In a direction perpendicular to the surface of the carrying platform on which the pole piece to be tested is placed, the rolling mechanism is arranged on a side of the pole piece to be tested away from the carrying platform, and the rolling mechanism is used to roll the folded pole piece to be tested to form a crease; An image recognition mechanism, comprising an image acquisition unit and an image processing unit, wherein the image acquisition unit is disposed on the carrying mechanism and is used to acquire an image at the fold, and the image processing unit is communicatively connected with the image acquisition unit, and the image processing unit is used to determine whether the fold is light-transmissive according to the image; A flipping mechanism, the flipping mechanism comprising a suction cup and a second driver, the second driver is drivingly connected to the suction cup, the suction cup is rotatably connected to the bearing mechanism, and the suction cup is used to absorb the pole piece to be tested; Driven by the second driver, the suction cup can flip the pole piece to be tested.

2. The pole piece flexibility testing device according to claim 1, characterized in that: The folding mechanism comprises a first connecting rod, a first driver and a first connecting member, wherein the first connecting member is connected to the first connecting rod, the first connecting member is used to connect with the electrode to be tested, the first connecting rod is rotatably connected to the bearing mechanism, and the first driver is drivingly connected to the first connecting rod; Driven by the first driver, the first connecting rod and the first connecting member can fold the pole piece to be tested in half or unfold the folded pole piece to be tested.

3. The pole piece flexibility testing device according to claim 2, characterized in that: The folding mechanism also includes a rotating shaft, a second connecting rod, a second driver and a second connecting member, the second connecting member is connected to the second connecting rod, the first connecting rod and the second connecting rod are rotatably connected to the supporting mechanism through the rotating shaft, the second driver is transmission-connected to the second connecting rod, the first connecting member and the second connecting member are used to be respectively connected to the opposite ends of the pole piece to be tested, and under the drive of the first driver and the second driver, the first connecting member, the first connecting rod, the second connecting member and the second connecting rod can fold the pole piece to be tested or unfold the folded pole piece to be tested.

4. The pole piece flexibility testing device according to claim 3, characterized in that: In a direction perpendicular to the surface of the carrying platform on which the pole piece to be tested is placed, the image acquisition unit is arranged on a side of the pole piece to be tested away from the carrying platform, and the image acquisition unit is arranged opposite to the rotating shaft.

5. The pole piece flexibility testing device according to any one of claims 2 to 4, characterized in that: The surface of the carrying platform for placing the electrode piece to be tested is recessed inward to form an avoidance groove, and the avoidance groove can accommodate at least a part of the first connecting member.

6. The pole piece flexibility testing device according to claim 1, characterized in that: The flipping mechanism also includes a flipping axis, the suction cup is rotatably connected to the supporting mechanism via the flipping axis, and the second driver is transmission-connected to the flipping axis; the supporting platform includes a first platform and a second platform which are arranged opposite to each other on both sides of the flipping axis along the radial direction of the flipping axis; under the drive of the second driver, the suction cup can flip the pole piece to be tested on the first platform to the second platform or flip the pole piece to be tested on the second platform to the first platform.

7. The pole piece flexibility testing device according to claim 6, characterized in that: The surface of the second platform for placing the electrode to be tested is recessed inward to form a receiving groove, the receiving groove is communicated with the gap between the first platform and the second platform, and the receiving groove is used to receive at least part of the suction cup.

8. The pole piece flexibility testing device according to any one of claims 6-7, characterized in that: The flip mechanism also includes a telescopic rod, which extends in a direction perpendicular to the surface of the bearing platform on which the electrode to be tested is placed. The fixed end of the telescopic rod is connected to the bearing mechanism, and the flip shaft is rotatably connected to the telescopic end of the telescopic rod.

9. The pole piece flexibility testing device according to claim 1, characterized in that: The rolling mechanism includes a crane and a pressing roller connected to the crane. The crane is connected to the bearing mechanism. Driven by the crane, the pressing roller can roll the folded electrode to be tested.

10. The pole piece flexibility testing device according to claim 1, characterized in that: The carrying platform is provided with a positioning block, and the positioning block protrudes from the surface of the carrying platform on which the pole piece to be tested is placed.

11. The pole piece flexibility testing device according to claim 1, characterized in that: The image recognition mechanism further comprises a light emitting unit, which is arranged on a side of the electrode piece to be tested close to the carrying platform, and is used for emitting light to the electrode piece to be tested.

12. The pole piece flexibility testing device according to claim 11, characterized in that: The luminous flux of the light emitting unit is set to D, where D≥500 lm.

13. A battery device production system, characterized in that: It comprises a pole piece flexibility testing device as described in any one of claims 1-12.

14. A method for testing the flexibility of a pole piece, characterized in that: The flexibility of the pole piece to be tested is tested using the pole piece flexibility testing device according to any one of claims 1 to 12, wherein the pole piece flexibility testing method comprises: Placing the pole piece to be tested on the carrying platform of the pole piece flexibility testing device; Folding the electrode to be tested in half using the folding mechanism of the electrode flexibility testing device; Using the rolling mechanism of the pole piece flexibility testing device to roll the pole piece to be tested to form a fold on the pole piece to be tested; The folded electrode to be tested is unfolded by the folding mechanism, and the image recognition mechanism of the electrode flexibility testing device collects the image of the fold through the image collection unit; The image processing unit of the image recognition mechanism determines whether the crease is light-transmissive based on the image. If the crease is light-transmissive, the image processing unit records the number of times the electrode to be tested is folded. If the crease is not light-transmissive, the image processing unit returns to execute the folding mechanism of the electrode flexibility testing device to fold the electrode to be tested.

15. The pole piece flexibility testing method according to claim 14, characterized in that: The method comprises: using a rolling mechanism of the pole piece flexibility testing device to roll the pole piece to be tested to form a fold on the pole piece to be tested, comprising: The rolling mechanism is used to roll the pole piece to be tested from the bent portion of the pole piece to be tested in a direction away from the bent portion.

16. The pole piece flexibility testing method according to claim 14, characterized in that: The folded electrode to be tested is unfolded by the folding mechanism, and the image recognition mechanism of the electrode flexibility testing device collects the image of the fold through the image acquisition unit, including: During the process of unfolding the folded electrode to be tested by the folding mechanism, the image acquisition unit continuously acquires images at the fold.

17. The pole piece flexibility testing method according to claim 14, characterized in that: In the case where the fold is opaque, before returning to the step of folding the electrode to be tested in half using the folding mechanism of the electrode flexibility testing device, the electrode flexibility testing method further includes: Turn over the electrode to be tested.

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