Pole piece film roll, manufacturing device, recognition device and method

Abstract

The invention relates to a pole piece film roll, a manufacturing device, a recognition device and a method, the pole piece film roll comprises a pole piece, the pole piece comprises a first part and a second part which are connected, the edge of the first part is provided with a roll changing mark, the edge of the second part is provided with a tab, and the roll changing mark and the tab are located on the same side of the pole piece. And the pole piece film roll is formed by winding the pole piece by taking the first part as a starting end. The pole piece film roll is formed by winding the pole piece, the pole piece is divided into two parts according to different structures, when the pole piece film roll is formed through winding, the first part serves as the starting end, so that the first part and the roll changing mark become the innermost layer structure in the pole piece film roll, and in the winding step of manufacturing the roll core, when the innermost layer structure is sent out, the first part is taken as the starting end; when the pole piece film roll is replaced, the pole piece film roll is almost completely wound, so that the roll replacement is required as long as the roll replacement mark is detected, the roll replacement time can be accurately grasped, and the problem that the pole piece flies due to too late roll replacement or more scrapes are generated due to advanced roll replacement is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell manufacturing, and in particular to a pole piece film roll, a manufacturing device, an identification device and a method. Background Art

[0002] The quality and demand for batteries are constantly increasing. When battery manufacturers improve product quality and production efficiency, it is particularly important to improve the yield in the battery manufacturing process.

[0003] The battery manufacturing process includes die cutting and winding steps.

[0004] The die-cutting process includes a unwinding shaft and a rewinding shaft. A laser is arranged between the unwinding shaft and the rewinding shaft. The electrode raw material film roll is mounted on the unwinding shaft for unwinding. The electrode raw material is cut into a certain size of pole ears by the laser to obtain the pole piece. The pole piece is then rewinded by the rewinding shaft and then cut in the middle to obtain two rolls of pole piece film rolls.

[0005] The winding process also includes a reel and a winding needle. The electrode film roll obtained in the die-cutting process is installed on the reel for unwinding. The unwound electrode is wound by the winding needle to be wound together with the diaphragm, etc., to form a winding core.

[0006] During the winding process, the timing of changing the electrode film roll is found by manually determining the length of the remaining material at the tail of the electrode film roll when it is unwound. If the roll is changed too late, it is easy to cause the electrode to fly or change the roll in advance, resulting in more scrap. Most manufacturers currently use sensors to measure the thickness of the electrode film roll to determine the timing of changing the roll, but due to the large measurement error, this method still cannot solve the problem of accurately grasping the timing of changing the roll. Summary of the invention

[0007] The embodiments of the present application provide a pole piece film roll, a manufacturing device, an identification device and a method to solve the problem in the related art that it is difficult to accurately grasp the timing of roll change, resulting in the pole piece flying due to changing the roll too late or more scrapped due to changing the roll too early.

[0008] In a first aspect, a pole piece film roll is provided, wherein the pole piece film roll comprises a pole piece, and the pole piece comprises a first part and a second part connected to each other, wherein a roll change mark is provided at an edge of the first part, and a pole ear is provided at an edge of the second part, and the roll change mark and the pole ear are located on the same side of the pole piece, and the pole piece film roll is formed by winding the pole piece with the first part as the starting end.

[0009] In some embodiments, the roll change mark and the pole piece have different identification parameters, and the identification parameters include one or more of shape and size.

[0010] In some embodiments, the identification parameter is a size, the size is the length in the length direction of the pole piece, and in the length direction of the pole piece, the length L1 of the roll change mark is greater than the length L2 of the pole piece.

[0011] In a second aspect, a method for manufacturing a pole piece film roll as described above is provided, comprising:

[0012] Determine whether a roll-changing connector on the electrode raw material delivered by the electrode raw material film roll is detected, and whether a roll-changing instruction for changing the electrode raw material film roll is received;

[0013] If a roll-changing connector is detected on the electrode material and a roll-changing instruction is received, the pole ear cutter is controlled to perform the first jump cut to form a roll-changing mark on the electrode material. After die-cutting, winding and cutting, the first part is wound as the starting end to form a pole film roll.

[0014] In some embodiments, if only a coil-changing connector is detected on the electrode raw material, the tab cutter is controlled to perform a second jump cut to skip the coil-changing connector.

[0015] In some embodiments, in the length direction of the electrode raw material, the length of the second jump cut is smaller than the length of the first jump cut.

[0016] In some embodiments, the length of the first jump cut is recorded as L1, and L1≥L0+M;

[0017] Wherein, L0 is the length of the pole piece tape when the winding machine driving the winding needle is decelerated from the winding speed V to the speed of 0 at a uniform deceleration rate a during the winding process when the roll change mark is detected, and

[0018] M is the adjustment constant used to prevent the pole piece from flying during the winding step.

[0019] In a third aspect, there is provided a manufacturing device for an electrode film roll as described above, comprising a first controller, and a first unwinding shaft, a first detector, a tab cutter and a first winding shaft arranged in sequence along the conveying direction of the electrode raw material;

[0020] The first unwinding shaft is used to install the electrode raw material film roll;

[0021] The first winding shaft is used for winding the pole piece with the first part as the starting end to form a pole piece film roll;

[0022] The first detector is located on one side of the moving path of the electrode stock and is used to detect the reel-changing connector on the electrode stock;

[0023] The tab cutter is located on one side of the moving path of the electrode raw material and is used to cut the electrode raw material to form tabs or roll change marks;

[0024] The first controller is connected to the first detector and the tab cutter, and is used to control the tab cutter to work according to the received roll-changing instruction and the detection result of the first detector.

[0025] In a fourth aspect, a device for identifying the unwinding tail material and the reel change of a pole piece film reel is provided, comprising:

[0026] a second detector, which is used to detect a roll change mark on a pole piece released from a pole piece film roll, wherein the pole piece film roll comprises a pole piece, and the pole piece comprises a first part, an edge of the first part is provided with a roll change mark, and the pole piece film roll is formed by winding the pole piece with the first part as a starting end;

[0027] A second controller is connected to the second detector, and the second controller is used to determine whether to rewind the pole film according to the detection result of the second detector.

[0028] In a fifth aspect, a method for identifying a device for identifying a film roll unwinding tail material change roll is provided, which comprises:

[0029] Determining whether the roll change mark is detected;

[0030] When the roll-changing mark is detected, a prompt is given to change the pole film roll;

[0031] Otherwise, no prompt.

[0032] The beneficial effects of the technical solution provided by this application include:

[0033] The pole piece film roll provided in the present application is wound by the pole piece, wherein the pole piece is divided into two parts according to the different structures, namely, the second part with the pole ear and the first part with the roll change mark, and the first part is used as the starting end when the pole piece film roll is wound by the winding shaft in the die-cutting step, which makes the first part and the roll change mark the innermost structure in the pole piece film roll. In the winding step of manufacturing the winding core, the unwinding shaft on which the pole piece film roll is installed will continuously send out the pole piece. When the innermost structure is sent out, it indicates that the pole piece film roll is basically almost wound, so it only needs to detect the roll change mark to indicate that the roll needs to be changed. In this way, the timing of the roll change can be accurately grasped to avoid the problem of pole piece flying tape due to too late roll change or more scrap caused by early roll change. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of a pole film roll provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of a manufacturing device for a pole piece film roll provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the manufacturing of the winding core provided in the embodiment of the present application;

[0038] Figure 4 Schematic diagram of the unwinding tail material and roll replacement identification device for the electrode film roll provided in an embodiment of the present application.

[0039] In the figure: 1. pole piece film roll; 2. pole piece; 21. first part; 210. roll change mark; 22. second part; 220. pole ear; 3. electrode raw material film roll; 30. electrode raw material; 300. pole piece coating area; 301. foil area; 4. roll change connector; 5. pole ear cutter; 6. first unwinding shaft; first winding shaft; 7. first detector; 8. second detector; 9. upper diaphragm unwinding shaft; 10. upper diaphragm; 11. lower diaphragm unwinding shaft; 12. lower diaphragm; 13. winding needle. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an embodiment of the present application provides a pole piece film roll, wherein the pole piece film roll 1 includes a pole piece 2, and the pole piece 2 includes a first part 21 and a second part 22 connected to each other, wherein a roll change mark 210 is provided at an edge of the first part 21, and a pole ear 220 is provided at an edge of the second part 22, and the roll change mark 210 and the pole ear 220 are located on the same side of the pole piece 2, and the pole piece film roll 1 is formed by winding the pole piece 2 with the first part 21 as the starting end.

[0042] The pole piece film roll 1 provided in the present application is wound by a pole piece 2, wherein the pole piece 2 is divided into two parts according to different structures, namely, a second part 22 with a pole ear 220 and a first part with a roll change mark 210, and the first part 21 is used as the starting end when the pole piece film roll 1 is wound by a winding shaft in the die-cutting step, which makes the first part 21 and the roll change mark 210 the innermost structure in the pole piece film roll 1. In the winding step of manufacturing the winding core, the unwinding shaft on which the pole piece film roll 1 is installed will continuously send out the pole piece, and when the innermost structure is sent out, it indicates that the pole piece film roll 1 is basically almost wound, so it only needs to detect the roll change mark 210 to indicate that the roll needs to be changed, so that the timing of the roll change can be accurately grasped to avoid the problem of pole piece flying tape due to too late roll change or more scrap caused by early roll change.

[0043] It can be understood that, since the roll change mark 210 and the pole ear 220 are both located at the edge of the pole piece 2, there are different features between the two to achieve distinction between the two.

[0044] Specifically, in the present application, the roll change mark 210 and the pole piece 2 are distinguished from each other by setting different identification parameters.

[0045] This identification parameter has different forms.

[0046] For example, the identification parameter may be a shape to achieve the purpose of differentiation, such as Figure 1 As shown in FIG. 1 , the roll change mark 210 is square, while the tab 220 is trapezoidal.

[0047] For another example, the identification parameter may be a size, which may be the length in the length direction of the pole piece 2 or the length in the width direction of the pole piece 2, so as to achieve the purpose of distinction, such as Figure 1 As shown in FIG. 2 , in the length direction of the pole piece 2 , the length L1 of the roll change mark 210 is greater than the length L2 of the pole piece 2 .

[0048] Of course, combinations of the above different forms can also be used.

[0049] See also Figure 1 and Figure 2 As shown, the embodiment of the present application also provides a method for manufacturing a pole piece film roll, which comprises the following steps:

[0050] 101 : Determine whether the roll-changing connector 4 on the electrode raw material 30 delivered by the electrode raw material film roll 3 is detected, and whether a roll-changing instruction for changing the electrode raw material film roll 3 is received.

[0051] It is understandable that in the die-cutting step, when the electrode raw material film roll 3 is used to manufacture the electrode film roll, the electrode raw material film roll 3 is installed on the first unwinding shaft 6 to unwind the electrode raw material 30, and the electrode 2 is wound through the first winding shaft to form the electrode film roll 1. When a roll of electrode raw material film roll 3 on the first unwinding shaft 6 is almost used up, it is necessary to replace it with a new roll of electrode raw material film roll 3. At this time, the new and old rolls of electrode raw material film rolls 3 need to be connected, and the roll-changing connector 4 is usually used to achieve the purpose of connection.

[0052] It is understandable that the above-mentioned roll-changing connector 4 is also a commonly used part, such as an adhesive tape.

[0053] In the die-cutting process, when a roll of electrode raw material film 3 is almost used up, the employee needs to replace it with a new electrode raw material film roll 3. At this time, the new electrode raw material film roll 3 will be scanned to scan the brand barcode, thereby giving the control device a roll change signal to prompt the control device to replace the new electrode raw material film roll 3. By scanning the barcode, the raw materials can also be traced.

[0054] The old electrode raw material film roll 3 that is about to be used up is removed from the first unwinding shaft 6, and then replaced with a new electrode raw material film roll 3, and the starting end of the new electrode raw material film roll 3 is connected to the end of the old electrode raw material film roll 3 through the roll changing connector 4, and then the die-cutting process can continue.

[0055] 102: If the roll-changing connector 4 on the electrode raw material 30 is detected and a roll-changing instruction is received, the pole ear cutter 5 is controlled to perform the first jump cut to form a roll-changing mark 210 on the electrode raw material 30. After die-cutting, winding and cutting, the first part 21 is used as the starting end for winding to form a new pole film roll 1.

[0056] It can be understood that when the first portion 21 is wound as the starting end, the cutting line AA (such as Figure 1 As shown) is before the first jump cut, this can ensure that after cutting from the cutting line AA, it can be smoothly wound with the first part 21 as the starting end, and then jump cut can be performed to make the roll change mark 210 become the innermost structure in the new electrode film roll 1.

[0057] 103 : If only the coil-changing connector 4 on the electrode raw material 30 is detected, the tab cutter 5 is controlled to perform a second jump cut to skip the coil-changing connector 4 .

[0058] In the present application, two different jump cuts are set up in order to distinguish the splicing of the roll-changing connector 4 under different circumstances, that is, to distinguish whether the splicing is a normal roll-changing splicing of the electrode raw material film roll 3, or a splicing when the roll-changing connector 4 appears when preparing the electrode raw material film roll 3.

[0059] Through the above-mentioned jump cutting method, the forming of the roll change mark 210 can be realized. It can be understood that, in fact, the pole ear 220 and the roll change mark 210 are both formed by cutting the edge structure of the electrode raw material 30 by the pole ear cutter 5. The difference is that the pole ear 220 is cut normally, while the roll change mark 210 is realized by jump cutting.

[0060] See also Figure 2 As shown, the electrode raw material 30 includes a pole piece coating area 300 in the middle and a foil area 301 at the edge. The foil area 301 is cut by a pole tab cutter 5 to form a pole tab 220 and a roll change mark 210 .

[0061] It can be understood that the advantage of using this method to implement the pole ear 220 and the roll change mark 210 is that there is no need to change the electrode raw material 30, and it can be achieved by simply controlling the cutting method of the pole ear cutter 5. To control this cutting method, it is only necessary to change the control program, and the impact on existing equipment is very small.

[0062] As mentioned above, the identification parameters of the roll change mark 210 in the present application may be shape, size, etc.

[0063] For example, taking the length of the pole piece 2 in the longitudinal direction as an example, the duration of the jump cut can be controlled so that the foil area 301 is not cut by the pole ear cutter 5 within the duration, thereby obtaining a roll change mark 210 with a required length.

[0064] It can be understood that, since different jump cuts are used to distinguish different joint situations, different jump cuts also have different identification parameters. This identification parameter can also be shape or size. For example, as an example, in the length direction of the electrode raw material 30, the length of the second jump cut is smaller than the length of the first jump cut.

[0065] It can be understood that the length of the first jump cut is actually equal to the length L1 of the roll change mark 210 .

[0066] The first jump cut and the second adjustment length values ​​can be determined according to actual needs.

[0067] See also Figure 3 As shown, it can usually be calculated through the situation in the actual winding process.

[0068] In the winding process, the winding needle 13 is driven by the winding machine to wind, the winding speed is recorded as V, the unit is m / s, and the uniform deceleration of the winding machine is recorded as a, the unit is m / s 2 When the roll change mark 210 is detected, the machine needs to be stopped for roll change. At this time, the winding machine decelerates from the winding speed V to 0 according to the uniform deceleration a. At this time, the length of the pole piece 2 is L0, and

[0069] Then L1≥L0+M, M is the adjustment constant used to prevent the pole piece 2 from flying during the winding step. Only when L1≥L0+M is satisfied can it be ensured that the winding tail material will not fly.

[0070] Similarly, for the second skip length L3, since its purpose is to skip the reel-changing connector 4, L3≥L4+M, where L4 is the length of the reel-changing connector 4 in the length direction of the pole piece 2.

[0071] M can be obtained by experiment or assigned based on experience. For example, as an example, M=0.3 meters.

[0072] For example, as an example, the length of the first jump cut ranges from 250 to 300 cm, and the length of the second jump cut ranges from 20 to 40 cm. Preferably, the length of the first jump cut ranges from 270 cm, and the length of the second jump cut ranges from 30 cm.

[0073] Based on the manufacturing method of the above-mentioned pole film roll, see Figure 1 and Figure 2 As shown, an embodiment of the present application also provides a manufacturing device for an electrode film roll, which includes a first controller, and a first unwinding shaft 6, a first detector 7, a pole ear cutter 5 and a first winding shaft arranged in sequence along the conveying direction of the electrode raw material 30, the first unwinding shaft 6 is used to install the electrode raw material film roll 3; the first winding shaft is used to wind the electrode 2 with the first part 21 as the starting end to form the electrode film roll 1; the first detector 7 is located on one side of the moving path of the electrode raw material 30, and is used to detect the winding connection 4 on the electrode raw material 30; the pole ear cutter 5 is located on one side of the moving path of the electrode raw material 30, and is used to cut the electrode raw material 30 to form a pole ear 220 or a winding mark 210; the first controller is connected to the first detector 7 and the pole ear cutter 5, and is used to control the operation of the pole ear cutter 5 according to the received winding instruction and the detection result of the first detector 7.

[0074] The manufacturing device provided in the present application utilizes a first unwinding shaft 6 to install an electrode raw material film roll 3, and utilizes a first winding shaft to wind up an electrode film roll 1. In the die-cutting step, a pole ear cutter 5 cuts the foil area 301 of the electrode raw material 30 according to a predetermined procedure to form a pole ear 220. When the first controller receives a roll changing instruction and the first detector 7 detects a roll changing connector 4, the pole ear cutter 5 is controlled to jump cut, thereby forming a roll changing mark 210.

[0075] It can be understood that if the electrode raw material 30 includes a pole piece coating area 300 in the middle and a foil area 301 on one side edge, then only one pole ear cutter 5 can be used to cut the foil area 301 on one side edge, and the first winding shaft can be wound up to directly obtain a roll of pole piece film 1.

[0076] It can be understood that if the electrode raw material 30 includes a pole piece coating area 300 in the middle and foil areas 301 on both side edges, then two of the above-mentioned pole ear cutters 5 are arranged at this time, and the foil areas 301 on both side edges of the electrode raw material 30 are cut respectively. The first winding shaft is wound up to directly obtain a pole piece film semi-finished product, which is then cut from the middle to obtain two pole piece film rolls 1.

[0077] The first detector 7 can use a color code sensor to sense the roll-changing connector 4. It is understandable that in order to achieve color sensing, the colors of the roll-changing connector 4 and the pole piece have a distinguishable color difference, such as using different colors, or using the same color but with different shades.

[0078] The first detector 7 may also use an image acquisition device such as a camera to identify the acquired image. If the roll-changing connector 4 appears in the acquired image, it means that the roll-changing connector 4 is detected.

[0079] In order to promptly identify whether a roll change is required, see Figure 3 and Figure 4 As shown, an embodiment of the present application also provides a device for identifying unwinding tail material and reel change of an electrode film roll, which includes a second detector 8 and a second controller, the second detector 8 is used to detect the reel change mark 210 on the electrode 2 released from the electrode film roll 1, wherein the electrode film roll 1 includes a electrode 2, and the electrode 2 includes a first part 21, the edge of the first part 21 is provided with a reel change mark 210, and the electrode film roll 1 is wound by the electrode 2 with the first part 21 as the starting end; the second controller is connected to the second detector 8, and the second controller is used to determine whether to reel the electrode film roll 1 according to the detection result of the second detector 8.

[0080] When used in the winding step of manufacturing the winding core, the edge of the electrode 2 is detected by the second detector 8, and it is determined whether the roll change mark 210 is detected; when the roll change mark 210 is detected, it is prompted to change the electrode film roll 1. At this time, the alarm can be immediately stopped, and the employee replaces the new electrode film roll 1 with the new one for production, so that the employee can be accurately reminded of the roll change time, avoiding the employee's inaccurate judgment of the roll change time, which will cause the electrode to fly or change the roll in advance to cause more scrap; otherwise, no prompt is given and production continues.

[0081] The identification parameter of the roll change mark 210 may be shape or size.

[0082] According to different situations, different devices can be selected as the second detector 8 .

[0083] For instance, as an example, for the recognition parameter of the roll change mark 210 using shape or size, the second detector 8 may use an image acquisition device such as a camera to recognize the acquired image. If the roll change mark 210 appears in the acquired image, it indicates that the machine needs to be stopped for roll change.

[0084] For another example, as an example, the identification parameter of the roll change mark 210 can be a size, which is the length in the length direction of the pole piece 2, specifically Figure 1 As shown in , in the length direction of the pole piece 2, the length L1 of the roll change mark 210 is greater than the length L2 of the pole piece 2. At this time, the second detector 8 can be an infrared sensor, including a receiver and a transmitter, which are just located on both sides of the pole ear 220. When the pole ear 220 or the roll change mark 210 moves between the two, the infrared rays emitted by the transmitter cannot be captured by the receiver due to being blocked. When the gap between two adjacent pole ears 220 or the gap between the pole ear 220 and the roll change mark 210 moves between the two, the infrared rays emitted by the transmitter can be successfully captured by the receiver due to being unblocked. Since the length of the roll change mark 210 is different from that of the pole piece 2, the length of time that the receiver captures the infrared rays can be directly judged to distinguish the roll change mark 210 from the pole piece 2, thereby realizing the recognition of the roll change mark 210.

[0085] It is understandable that, since both positive and negative electrode sheets are needed during the manufacture of the winding core, the electrode film roll 1 mentioned in the present application can be either a positive electrode film roll or a negative electrode film roll.

[0086] For example, see Figure 3 As shown, the electrode film roll 1 on the left is a positive electrode film roll, and the electrode film roll 1 on the right is a negative electrode film roll. Both are provided with a second detector 8 to determine whether the positive electrode film roll or the negative electrode film roll needs to be replaced in time. The upper part is an upper diaphragm unwinding shaft 9 to deliver the upper diaphragm 10, and the lower part is a lower diaphragm unwinding shaft 11 to deliver the lower diaphragm 12. The four are wound by rollers and winding needles 13 to form a winding core.

[0087] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0088] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0089] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pole film roll, characterized in that: The pole piece film roll (1) comprises a pole piece (2), and the pole piece (2) comprises a first part (21) and a second part (22) which are connected to each other, wherein a roll change mark (210) is provided on the edge of the first part (21), and a pole ear (220) is provided on the edge of the second part (22), and the roll change mark (210) and the pole ear (220) are located on the same side of the pole piece (2), and the pole piece film roll (1) is formed by winding the pole piece (2) with the first part (21) as the starting end.

2. The pole piece film roll according to claim 1, characterized in that: The roll change mark (210) and the pole piece (2) have different identification parameters, and the identification parameters include one or more of shape and size.

3. The pole piece film roll according to claim 2, characterized in that: The identification parameter is a size, the size is the length in the length direction of the pole piece (2), and in the length direction of the pole piece (2), the length L1 of the roll change mark (210) is greater than the length L2 of the pole piece (2).

4. A method for manufacturing a pole piece film roll according to any one of claims 1 to 3, characterized in that: It includes: Determining whether a roll-changing connector (4) on the electrode raw material (30) delivered by the electrode raw material film roll (3) is detected, and whether a roll-changing instruction for changing the roll of the electrode raw material film roll (3) is received; If a roll-changing connector (4) is detected on the electrode material (30) and a roll-changing instruction is received, the electrode ear cutter (5) is controlled to perform a first jump cut to form a roll-changing mark (210) on the electrode material (30). After die-cutting, winding and cutting, the electrode material is wound with the first part (21) as the starting end to form an electrode film roll (1).

5. The method for manufacturing a pole piece film roll according to claim 4, characterized in that: If only the coil-changing connector (4) on the electrode raw material (30) is detected, the electrode tab cutter (5) is controlled to perform a second jump cut to skip the coil-changing connector (4).

6. The method for manufacturing a pole piece film roll according to claim 5, characterized in that: In the length direction of the electrode raw material (30), the length of the second jump cut is smaller than the length of the first jump cut.

7. The method for manufacturing a pole piece film roll according to claim 4, characterized in that: The length of the first jump cut is recorded as L1, and L1≥L0+M; Wherein, L0 is the length of the pole piece (2) when the winding machine driving the winding needle decelerates from the winding speed V to a speed of 0 at a uniform deceleration rate a during the winding process when the winding change mark (210) is detected, and M is an adjustment constant used to prevent the pole piece (2) from flying during the winding process.

8. A manufacturing device for a pole piece film roll as claimed in any one of claims 1 to 3, characterized in that: It comprises a first controller, and a first unwinding shaft (6), a first detector (7), a tab cutter (5) and a first winding shaft which are sequentially arranged along the conveying direction of the electrode raw material (30); The first unwinding shaft (6) is used to install the electrode raw material film roll (3); The first winding shaft is used to wind up the pole piece (2) with the first portion (21) as the starting end to form a pole piece film roll (1); The first detector (7) is located on one side of the moving path of the electrode raw material (30) and is used to detect the reel-changing connector (4) on the electrode raw material (30); The tab cutter (5) is located on one side of the moving path of the electrode raw material (30) and is used to cut the electrode raw material (30) to form a tab (220) or a roll change mark (210); The first controller is connected to the first detector (7) and the tab cutter (5), and is used to control the operation of the tab cutter (5) according to the received roll change instruction and the detection result of the first detector (7).

9. A device for identifying the unwinding tail material and the reel change of a pole film reel, characterized in that: It includes: a second detector (8) for detecting a roll change mark (210) on a pole piece (2) released from a pole piece film roll (1), wherein the pole piece film roll (1) comprises a pole piece (2), and the pole piece (2) comprises a first portion (21), an edge of the first portion (21) is provided with a roll change mark (210), and the pole piece film roll (1) is formed by winding the pole piece (2) with the first portion (21) as a starting end; A second controller is connected to the second detector (8), and the second controller is used to determine whether to replace the pole piece film roll (1) according to the detection result of the second detector (8).

10. An identification method for the unwinding tail material change roll identification device of the electrode film roll as claimed in claim 9, characterized in that: It includes: Determining whether the roll change mark is detected (210); When the roll change mark (210) is detected, a prompt is given to change the pole film roll (1); Otherwise, no prompt.

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