Pole piece cutting method, pole piece cutting system and battery production equipment

Abstract

An embodiment of the present application provides a method for slitting a pole piece, a pole piece slitting system, and a battery production device. The method for slitting a pole piece is used for a slitting device, and the slitting device includes a rolling component and a slitting component. The rolling component is configured to convey the pole piece, and the slitting component is configured to slit the pole piece. The method for slitting a pole piece includes: obtaining parameter information of the rolling component, where the parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotation turns; judging that the pole piece has rewound according to the parameter information, and outputting a shutdown instruction to stop the slitting device. The present application can effectively monitor the rewinding phenomenon generated during the slitting of the pole piece.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a method for cutting a pole piece, a pole piece cutting system, and a battery production device. Background Art

[0002] During the production process of a battery, it is necessary to cut the pole piece into multiple parts. When starting or stopping the cutting process, due to uneven front and rear tensions of the pole piece, it may move a certain distance in the opposite direction, that is, reverse winding. After reverse winding occurs, it is possible to cut the already cut pole piece again.

[0003] If the reverse winding phenomenon of the pole piece during the cutting process is not detected in time, it may affect the forming quality of the pole piece in subsequent cutting operations. Summary of the Invention

[0004] In view of the above problems, the present application provides a method for cutting a pole piece, a pole piece cutting system, and a battery production device, which can effectively monitor the reverse winding phenomenon generated during the cutting of the pole piece.

[0005] In a first aspect, the present application provides a method for cutting a pole piece for a cutting device. The cutting device includes a rolling component and a cutting component. The rolling component is configured to convey the pole piece, and the cutting component is configured to cut the pole piece. The method for cutting a pole piece includes: obtaining parameter information of the rolling component, where the parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotation turns; determining that the pole piece has reverse wound according to the parameter information, and outputting a stop instruction to stop the cutting device.

[0006] In some embodiments of the first aspect, by obtaining the parameter information of the rolling component, it is possible to determine that the pole piece has reverse wound and output a stop instruction to stop the cutting device. Through the above operations, it is possible to monitor the reverse winding phenomenon of the pole piece in real time, and it is also beneficial to improve the accuracy of monitoring the occurrence of the reverse winding phenomenon.

[0007] In some embodiments, the parameter information includes a rotation direction. Determining that the pole piece has reverse wound according to the parameter information and outputting a stop instruction to stop the cutting device includes: determining that the pole piece has reverse wound according to the rotation direction being different from a preset direction.

[0008] In the above solution, it is possible to determine that the pole piece has reverse wound according to the rotation direction of the rolling component, which is easy to implement.

[0009] In some embodiments, the method for cutting a pole piece further includes: calculating and recording the length of the reverse winding of the pole piece according to the parameter information.

[0010] In the above solution, the length of the rewinding of the pole piece can be calculated and recorded so that the subsequent operators can trace it.

[0011] In some embodiments, the pole piece slitting method further includes: judging that the pole piece has rewound according to the parameter information, and outputting an alarm instruction to send an alarm signal. By setting in this way, it is convenient to prompt the operator that the pole piece has rewound and check it.

[0012] In some embodiments, the pole piece slitting method further includes: judging that the pole piece has rewound according to the parameter information, and outputting a marking instruction to mark at the position where the pole piece has rewound. By setting in this way, it is convenient for the subsequent operator to process the rewound part of the pole piece.

[0013] In some embodiments, the pole piece slitting method further includes: obtaining the surface information of the position where the pole piece has rewound according to the slitting equipment being in a stopped state; judging that the pole piece has drawn wire according to the surface information of the pole piece rewinding position, and outputting a cleaning instruction to clean the drawn wire on the pole piece.

[0014] In the above solution, after the pole piece has rewound, it is possible to judge that the pole piece has drawn wire by obtaining the surface information of the position where the pole piece has rewound, and an instruction to clean the drawn wire on the pole piece can be output, so as to process the drawn wire generated on the pole piece in time, prevent the drawn wire from not being cleaned in time and affecting the quality of the pole piece, and is conducive to improving the forming quality after the pole piece is slit.

[0015] In some embodiments, obtaining the surface information of the pole piece rewinding position according to the slitting equipment being in a stopped state includes: photographing the position where the pole piece has rewound to obtain the surface information of the position where the pole piece has rewound. By setting in this way, the work burden of the operator can be reduced, and it is also conducive to improving the automation design.

[0016] In some embodiments, the pole piece slitting method further includes: after cleaning the drawn wire on the pole piece, sending a start instruction to start the slitting equipment. After the rolling component rotates for a preset time, sending a stop instruction to stop the slitting equipment, and obtaining the surface information of the position where the pole piece rewound last time again according to the slitting equipment being in a stopped state.

[0017] In the above solution, when the pole piece that has rewound is conveyed again by the rolling component, it is still possible to have the phenomenon of drawing wire again. Therefore, through the above operations, the two possible drawing wire phenomena caused by the rewinding of the pole piece can be cleared, so as to be conducive to better improving the forming quality after the pole piece is slit.

[0018] Second aspect, the present application provides a pole piece slitting system, including: a slitting device, including a rolling component and a slitting component, the rolling component is configured to convey the pole piece, and the slitting component is configured to slit the pole piece; a detection device, arranged on the rolling component, the detection device is configured to detect parameter information of the rolling component, and the parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotation turns; a control component, communicatively connected to the slitting device and the detection device respectively, the control component is configured to judge that the pole piece has rewound according to the parameter information detected by the detection device and output a shutdown instruction, and the slitting device is configured to receive the shutdown instruction to stop.

[0019] In some embodiments of the second aspect, by arranging a detection device on the rolling component, the detection device can detect the parameter information of the rolling component and can directly or indirectly send the parameter information of the rolling component to the control component. The control component can judge that the pole piece has rewound according to the parameter information detected by the detection device, so that the slitting device stops, to effectively monitor the rewinding phenomenon of the pole piece. And, the operator can check whether there is wire drawing at the position where the pole piece has rewound and remove the wire drawing, which is beneficial to improving the forming quality of the pole piece after slitting.

[0020] In some embodiments, the rolling component includes a first roller body, the first roller body is located upstream of the slitting component, the detection device is connected to the first roller body, and the pole piece forms a wrap angle area at the first roller body.

[0021] In the above solution, connecting the detection device to the first roller body with sufficient friction to the pole piece is beneficial to improving the accuracy of the parameter information obtained by the detection device.

[0022] In some embodiments, the pole piece slitting system further includes a warning device, the warning device is communicatively connected to the control component, and the control component is further configured to judge that the pole piece has rewound according to the parameter information and output an alarm instruction, and the warning device is configured to receive the alarm instruction to emit an alarm signal.

[0023] In the above solution, when the control component judges that the pole piece has rewound according to the parameter information, it can output an alarm instruction so that the warning device emits an alarm signal to facilitate prompting the operator.

[0024] In some embodiments, the pole piece slitting system further includes a marking device, the marking device is communicatively connected to the control component, and the control component is further configured to judge that the pole piece has rewound according to the parameter information and output a marking instruction, and the marking device is configured to receive the marking instruction to mark at the position where the pole piece has rewound.

[0025] In the above solution, when the control component determines that the pole piece has rewound according to the parameter information, it outputs a marking instruction, so that the marking device marks at the position where the pole piece has rewound, so that the subsequent operator can process the rewound part of the pole piece.

[0026] In some embodiments, the pole piece slitting system further includes an image acquisition device, the image acquisition device is communicatively connected to the control component, the control component is further configured to determine that the pole piece has rewound according to the parameter information and output an acquisition instruction, and the image acquisition device is configured to receive the acquisition instruction to obtain the surface information of the position where the pole piece has rewound.

[0027] In the above solution, the operator can determine whether there is a wire drawing phenomenon at the position where the pole piece has rewound according to the image information collected by the image acquisition device.

[0028] In some embodiments, the image acquisition device includes at least two shooting devices, at least one shooting device is arranged upstream of the slitting component, and at least one shooting device is arranged downstream of the slitting component. By setting in this way, it is beneficial to improve the accuracy of the image information collected by the image acquisition device.

[0029] In a third aspect, the present application provides a battery production device, including the pole piece slitting system according to any one of the embodiments of the second aspect.

[0030] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the drawings.

[0032] Figure 1 It is a flowchart of a pole piece slitting method provided by some embodiments of the present application;

[0033] Figure 2 It is a partial structural schematic diagram of a pole piece slitting system for slitting a pole piece provided by some embodiments of the present application;

[0034] Figure 3 It is a flowchart of a pole piece slitting method provided by other embodiments of the present application;

[0035] Figure 4Partial structural schematic diagram of a pole piece slitting system provided in other embodiments of the present application for slitting a pole piece;

[0036] Figure 5 Flowchart of a pole piece slitting method provided in still other embodiments of the present application.

[0037] Reference numerals in the specific embodiments are as follows:

[0038] 11. Rolling assembly; 111. First roller body; 112. Second roller body; 12. Slitting assembly;

[0039] 20. Detection device; 30. Image acquisition device; 31. Shooting device;

[0040] 200. Pole piece; 201. Wrapping angle area; 202. Straight area. Specific embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0043] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0044] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] The term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0047] The term "a plurality of" as used in the present application refers to two or more (including two).

[0048] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0049] During the production process of batteries, it is necessary to slit the electrode sheets into multiple pieces. The slitting knife at the slitting position will slit the tabs in the central blank area of the electrode sheet to divide the electrode sheet into N pieces, where N≥2. When starting or stopping the slitting operation, due to uneven front and rear tensions of the electrode sheet, there is a certain probability that the electrode sheet will move in the reverse direction for a certain distance, that is, rewind. After rewinding occurs, it is possible to slit the already slit electrode sheet again. If the rewinding phenomenon is not monitored in time, it may affect the forming quality of the electrode sheet in subsequent slitting operations.

[0050] Based on the above technical problems, the present application provides a method for slitting a pole piece, which is used for a slitting device. The slitting device includes a rolling component and a slitting component. The rolling component is configured to convey the pole piece, and the slitting component is configured to slit the pole piece. The method for slitting the pole piece includes obtaining parameter information of the rolling component. The parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotation turns. According to the parameter information, it is determined that the pole piece has rewound, and a stop instruction is output to stop the slitting device.

[0051] By obtaining the parameter information of the rolling component, it is possible to determine that the pole piece has rewound, so that the slitting device stops. Through the above operations, it is possible to monitor the rewinding phenomenon of the pole piece in real time, and it is also beneficial to improve the accuracy of monitoring the occurrence of the rewinding phenomenon.

[0052] Please refer to Figure 1 and Figure 2 According to some embodiments of the present application, the present application provides a method for slitting a pole piece, which is used for a slitting device. The slitting device includes a rolling component 11 and a slitting component 12. The rolling component 11 is configured to convey the pole piece 200, and the slitting component 12 is configured to slit the pole piece 200. The method for slitting the pole piece includes:

[0053] S100. Obtain parameter information of the rolling component 11. The parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotation turns;

[0054] S200. According to the parameter information, determine that the pole piece 200 has rewound, and output a stop instruction to stop the slitting device.

[0055] In the embodiment of the present application, when the pole piece 200 moves along the preset direction, it can be regarded as normal tape running. The "preset direction" refers to the direction from the first roller body 111 to the slitting component 12 in the length direction of the pole piece 200, as Figure 2 shown. When the pole piece 200 moves in the direction opposite to the preset direction, it can be regarded as rewinding, that is, the pole piece 200 moves along the direction from the slitting component 12 to the first roller body 111.

[0056] In step S100, the parameter information of the rolling component 11 can be obtained through the detection device 20. Optionally, the detection device 20 may include, but is not limited to, at least one of an encoder and a resolver. Among them, the detection device 20 is integrally connected to the rolling component 11 to facilitate improving the accuracy of obtaining the parameter information of the rolling component 11.

[0057] In step S200, the control component can determine that the pole piece 200 has rewound according to the parameter information, and output a shutdown instruction to stop the slitting equipment. Specifically, the detection device 20 is communicatively connected to the control component. The detection device 20 can directly send the parameter information it obtains to the control component, or the detection device 20 can also send the parameter information it obtains to the control component in the form of an electrical signal. The control component determines whether the pole piece 200 has rewound according to the parameter information sent by the detection device 20 or by decoding the electrical signal. If the control component determines that the pole piece 200 has rewound, it outputs a shutdown instruction to stop the slitting equipment and no longer perform the slitting operation on the pole piece 200. Of course, if the control component determines that the pole piece 200 has not rewound, the slitting equipment operates normally.

[0058] Among them, the operation of the slitting equipment to execute shutdown can be directly controlled by the control component. Of course, the control component can also output a shutdown instruction to other control components, and this component controls the slitting equipment to stop.

[0059] The pole piece slitting method provided by some embodiments of the present application can determine that the pole piece 200 has rewound by obtaining the parameter information of the rolling component 11 and output a shutdown instruction to stop the slitting equipment. Through the above steps, it is possible to monitor the rewinding phenomenon of the pole piece 200 in real time, and it is also beneficial to improve the accuracy of monitoring the occurrence of the rewinding phenomenon.

[0060] Through the above steps, it is possible to avoid the situation where the pole piece 200 rewinds but fails to be monitored in time, resulting in continued slitting and possible local wire drawing, which affects the forming quality of the pole piece 200.

[0061] In some optional embodiments, the parameter information includes the rotation direction, and step S200 includes:

[0062] Judge that the pole piece 200 has rewound according to the rotation direction being different from the preset direction.

[0063] The pole piece slitting method provided by some embodiments of the present application is convenient to implement by judging whether the pole piece 200 has rewound according to the rotation direction of the rolling component 11.

[0064] Of course, the slitting equipment can also be stopped according to any one of the rotation speed, rotation distance, rotation time, and rotation number of turns of the rolling component 11.

[0065] For example, in some optional embodiments, the parameter information includes the rotation distance, and step S200 includes:

[0066] Judge that the pole piece 200 has rewound according to the decreasing trend of the rotation distance.

[0067] In some optional embodiments, the pole piece slitting method further includes:

[0068] Calculate and record the length of the rewinding of the pole piece 200 according to the parameter information.

[0069] In the above steps, the control component can calculate and record the length of the rewinding of the pole piece 200 through the obtained parameter information of the rolling component 11. For example, the control component can calculate the length of the rewinding of the pole piece 200 based on the number of rotation turns of the rolling component 11 and the diameter of the rolling component 11, that is, the number of meters that the pole piece 200 moves in the direction opposite to the preset direction, and record the length of the rewinding of the pole piece 200 for subsequent operators to trace.

[0070] Alternatively, the detection device 20 can also calculate the length of the rewinding of the pole piece 200 according to the parameter information of the rolling component 11 and send the length value of the rewinding of the pole piece 200 to the control component.

[0071] In some optional embodiments, the pole piece slitting method further includes:

[0072] Record the moment when the pole piece 200 rewinds and the duration of the rewinding according to the parameter information.

[0073] In the above steps, the control component can also obtain the moment when the pole piece 200 rewinds and the duration of the rewinding through the parameter information of the rolling component 11, and record both the moment when the pole piece 200 rewinds and the duration for subsequent operators to trace.

[0074] In some embodiments, the pole piece slitting method further includes:

[0075] Judge that the pole piece 200 rewinds according to the parameter information and output an alarm instruction to emit an alarm signal.

[0076] In the above steps, it is convenient to prompt the operator that the pole piece 200 rewinds and check whether there is wire drawing. Optionally, an alarm instruction can be output to the warning device through the control component, and after receiving the alarm instruction, the warning device emits an alarm signal.

[0077] In some embodiments, the pole piece slitting method further includes:

[0078] Judge that the pole piece 200 rewinds according to the parameter information and output a marking instruction to mark the position where the pole piece 200 rewinds.

[0079] In the above steps, it is convenient for subsequent operators to process the part where the pole piece 200 rewinds.

[0080] Optionally, after the rewinding of the pole piece 200 occurs, the operator can mark the position where the pole piece 200 is rewound, or the position where the pole piece 200 is rewound can also be marked by a marking device. Specifically, the marking device is communicatively connected to the control component. When the control component determines that the pole piece 200 is rewound according to the parameter information, the control component controls the marking device to mark the position where the pole piece 200 is rewound.

[0081] Please refer to Figure 2 and Figure 3 , in some alternative embodiments, the pole piece slitting method further includes:

[0082] S300. Obtain the surface information of the position where the pole piece 200 is rewound according to the slitting equipment being in a stopped state;

[0083] S400. Judge that the pole piece 200 has drawn wire according to the surface information of the rewound position of the pole piece 200, and output a cleaning instruction to clean the drawn wire on the pole piece 200.

[0084] In step S300, the operator can check the position where the pole piece 200 is rewound, record or photograph the surface information of the position where the pole piece 200 is rewound, and transmit the recorded or photographed surface information to the control component.

[0085] Or, some photographing devices can also be used to photograph the position where the pole piece 200 is rewound. For example, the control component can control the photographing device to photograph the position where the pole piece 200 is rewound, and the photographing device sends the picture or video of the surface information of the position where the pole piece 200 is rewound to the control component.

[0086] In step S400, the control component can judge that the pole piece 200 has drawn wire according to the surface information of the rewound position of the pole piece 200 and output a cleaning instruction; of course, the control component can judge that the pole piece 200 has not drawn wire according to the surface information of the rewound position of the pole piece 200 and output a start instruction to start the slitting equipment.

[0087] Through the above steps, after the rewinding of the pole piece 200 occurs, it can be judged whether the pole piece 200 has drawn wire by obtaining the surface information of the position where the pole piece 200 is rewound, so as to timely obtain whether there is a wire drawing phenomenon at the position where the pole piece 200 is rewound. The control component can output a cleaning instruction to clean the drawn wire on the pole piece 200 in time, prevent the quality of the pole piece 200 from being affected due to the failure to clean the drawn wire in time, and is beneficial to improving the forming quality of the pole piece 200 after slitting.

[0088] Optionally, the control component can send a clearing instruction to the cleaning device. After receiving the clearing instruction, the cleaning device can clear the wire drawing generated by the pole piece 200, or the operator can clear the wire drawing generated by the pole piece 200 according to the clearing instruction.

[0089] In the above steps, the wire drawing generated by the pole piece 200 can be processed in a timely manner to prevent the quality of the pole piece 200 from being affected due to the failure to clear the wire drawing in time, which is beneficial to improving the forming quality after the pole piece 200 is slit.

[0090] Such as Figure 4 shown, in some optional embodiments, step S300 includes:

[0091] Take a picture of the position where the pole piece 200 has rewound to obtain the surface information of the position where the pole piece 200 has rewound.

[0092] In the above steps, an image acquisition device 30 can be set near the slitting component 12. The control component controls the image acquisition device 30 to take a picture of the position where the pole piece 200 has rewound, and the image acquisition device 30 can send the picture or video including the surface information of the position where the pole piece 200 has rewound to the control component.

[0093] Through the above steps, the workload of the operator can be reduced, and it is also beneficial to improve the automation design.

[0094] Please refer to Figure 2 and Figure 5 , in some optional embodiments, the pole piece slitting method further includes:

[0095] S500. After clearing the wire drawing on the pole piece 200, send a start instruction to start the slitting device. After the rolling component 11 rotates for a preset time, send a stop instruction to stop the slitting device. According to the fact that the slitting device is in a stopped state, obtain the surface information of the position where the pole piece 200 rewound last time again.

[0096] It can be understood that when the rewound pole piece 200 is conveyed by the rolling component 11 again, there is a certain probability that the pole piece 200 that has been slit will be slit again when the pole piece 200 moves in the preset direction again, and the pole piece 200 may generate wire drawing phenomenon again.

[0097] Therefore, through the above steps, it is possible to check for the two wire drawing phenomena that the pole piece 200 may generate due to rewinding, so as to clear the two wire drawings that the pole piece 200 may generate due to rewinding, which is beneficial to better improving the forming quality after the pole piece 200 is slit.

[0098] Optionally, the preset time can be 5 seconds, 10 seconds, and can be specifically set according to actual needs.

[0099] The method for preventing the tab from being drawn out provided by the embodiment of the present application can be used for slitting the electrode tab 200, and can also be used in other fields that require slitting, such as the film packaging field, the food production field, etc., which is beneficial to improving the product quality.

[0100] Please refer to Figure 2 , according to the embodiment of the present application, a system for slitting an electrode tab is provided, including a slitting device, a detection device 20, and a control component. The slitting device includes a rolling component 11 and a slitting component 12. The rolling component 11 is configured to convey the electrode tab 200, and the slitting component 12 is configured to slit the electrode tab 200. The detection device 20 is arranged on the rolling component 11, and the detection device 20 is configured to detect the parameter information of the rolling component 11, and the parameter information includes at least one of the rotation direction, rotation speed, rotation distance, rotation time, and number of rotation turns. The control component is respectively communicatively connected to the slitting device and the detection device 20. The control component is configured to judge that the electrode tab 200 has a reverse winding according to the parameter information detected by the detection device 20 and output a shutdown instruction, and the slitting device is configured to receive the shutdown instruction to stop.

[0101] The slitting device is used to transport the electrode tab 200 and slit it, so that the electrode tab 200 is divided into two, or three, or even more after being slit by the slitting device.

[0102] The rolling component 11 is used to convey the electrode tab 200, that is, to drive the electrode tab 200 to run the tape. The slitting component 12 is used to slit the electrode tab 200, and the slitting component 12 may include, but is not limited to, any one of a cutting knife and a slitting laser.

[0103] The detection device 20 is used to obtain the rotation direction, rotation speed, rotation distance, rotation time or number of rotation turns of the rolling component 11, and can directly send the above-obtained parameter information to the control component, or can send the above parameter information to the control component in the form of an electrical signal. The control component can judge whether the electrode tab 200 has a reverse winding according to the parameter information or by decoding the electrical signal.

[0104] In the system for slitting an electrode tab provided by some embodiments of the present application, by arranging the detection device 20 on the rolling component 11, the detection device 20 can detect the parameter information of the rolling component 11, and can directly or indirectly send the parameter information of the rolling component 11 to the control component. The control component can judge that the electrode tab 200 has a reverse winding according to the parameter information detected by the detection device 20 and output a shutdown instruction, and the slitting device can receive the shutdown instruction to stop, so as to effectively monitor the reverse winding phenomenon of the electrode tab 200. Moreover, the operator can check whether there is a wire drawing phenomenon at the position where the electrode tab 200 has a reverse winding and remove the wire drawing, which is beneficial to improving the forming quality of the electrode tab 200 after slitting.

[0105] Optionally, the detection device 20 may include an encoder, which may specifically be an incremental encoder. The encoder can convert the timing and phase relationship of the angle code disk through two photosensitive receiving tubes, encode the obtained parameter information and send it to the control component, and the control component can decode the received data to obtain the parameter information.

[0106] For example, as Figure 2 shown, the rolling component 11 rotates counterclockwise, enabling the pole piece 200 to move towards the slitting component 12 in a preset direction to be slit by the slitting component 12. The encoder continuously sends a signal of the parameter information of the normal tape running of the pole piece 200 to the control component, and the slitting device operates normally; when the rotation direction of the rolling component 11 is clockwise, the pole piece 200 will move in the direction opposite to the preset direction, and the encoder will send a signal of the parameter information of the pole piece 200 experiencing tape rewind to the control component. When the control component receives this signal and decodes the parameter information, it determines that the pole piece has experienced tape rewind and controls the slitting device to stop.

[0107] Optionally, the detection device 20 may further include a resolver, which is a device that converts angular displacement into an electrical signal.

[0108] Optionally, the number of detection devices 20 can be set to one, two, or even more.

[0109] In some alternative embodiments, the number of detection devices 20 can be set to more than two. The rolling component 11 includes a plurality of rollers distributed at intervals, and more than two detection devices 20 are respectively arranged on different rollers. By setting in this way, it is beneficial to improve the accuracy of the detection device 20 in obtaining data, so as to prevent one of the detection devices 20 from failing or other possibilities of not accurately obtaining data.

[0110] In some alternative embodiments, the detection device 20 is connected to one side of the rolling component 11 along its own axial direction and is coaxially arranged with the rolling component 11.

[0111] By setting in this way, it is beneficial to ensure the accuracy of the synchronous rotation of the detection device 20 and the rolling component 11, so as to improve the accuracy of the detection device 20 in obtaining data.

[0112] In some embodiments, at least one of the slitting device and the detection device 20 can be communicatively connected to the control component through a control signal line.

[0113] In some other embodiments, a wireless transmission module is provided in at least one of the slitting device and the detection device 20, and a wireless receiving module is provided in the control component. Specifically, the parameter information of the rolling component 11 can be transmitted to the control component by wireless transmission, and the control component can send a start or stop signal to the slitting device.

[0114] The control component may include a programmable logic controller (PLC). Specifically, the control component may include a monitoring host computer, in which a controller may be set. The controller may specifically be a programmable logic controller (PLC). An operator may monitor the operation of the slitting device through the monitoring host computer.

[0115] Optionally, the slitting device may further include a unwind device, a tension control device, a winding device, etc. The control component can control the start and stop of the slitting device, which can be understood as that the control component can control the start and stop of all devices in the slitting device.

[0116] Please continue to refer to Figure 2 , in some optional embodiments, the rolling component 11 includes a first roller body 111. The first roller body 111 is located upstream of the slitting component 12. The detection device 20 is connected to the first roller body 111, and the pole piece 200 forms a wrap angle area 201 at the first roller body 111.

[0117] In the embodiments of the present application, "upstream" and "downstream" refer to the sequence of production. For example, "upstream" means earlier in the production sequence. The first roller body 111 is located upstream of the slitting component 12, that is to say, the pole piece 200 first passes through the first roller body 111 for transmission and then passes through the slitting component 12 for slitting.

[0118] The "wrap angle area 201" means that the parts of the pole piece 200 on both sides of the first roller body 111 are in different extension planes, that is, there is an included angle between the parts of the pole piece 200 on both sides of the first roller body 111.

[0119] The rolling component 11 further includes a second roller body 112. The pole piece 200 forms a straight area 202 at the second roller body 112. The "straight area 202" means that the parts of the pole piece 200 on both sides of the second roller body 112 are in the same extension plane, that is, the parts of the pole piece 200 on both sides of the second roller body 112 are arranged in parallel.

[0120] Therefore, the frictional force provided by the pole piece 200 to the first roller body 111 located in the wrap angle area 201 is greater than the frictional force provided by the pole piece 200 to the second roller body 112 located in the straight area 202. In actual operation, the first roller body 111 rotates more reliably than the second roller body 112, that is, the first roller body 111 is not likely to slip with the pole piece 200 and other phenomena.

[0121] In some embodiments of the present application, the pole piece slitting system provided, by connecting the detection device 20 to the first roller body 111 having sufficient frictional force with the pole piece 200, is conducive to improving the accuracy of the parameter information obtained by the detection device 20.

[0122] In some optional embodiments, the pole piece slitting system further includes a warning device, which is communicatively connected to the control component. The control component is further configured to determine that the pole piece 200 has rewound based on the parameter information and output an alarm instruction, and the warning device is configured to receive the alarm instruction to issue an alarm signal.

[0123] For the pole piece slitting system provided by some embodiments of the present application, when the control component determines that the pole piece 200 has rewound based on the parameter information, it can output an alarm instruction, and the warning device can receive the alarm instruction to issue an alarm signal, so as to prompt the operator to check the slitting equipment.

[0124] In some embodiments, the warning device can be communicatively connected to the control component through a control signal line.

[0125] In some other embodiments, a wireless receiving module is provided in the warning device, and a wireless transmitting module is provided in the control component. Specifically, the control component can send an alarm instruction to the warning device by wireless transmission, and the warning device issues an alarm signal after receiving the alarm instruction.

[0126] The alarm signal can be a sound signal or an image signal sent to the monitoring host.

[0127] Optionally, the warning device includes a buzzer, and the buzzer can include but is not limited to any one of an electromagnetic buzzer, a piezoelectric buzzer, etc.

[0128] Optionally, the warning device includes a speaker, and the speaker can include but is not limited to any one of a moving coil speaker, a piezoelectric speaker, a horn speaker, etc.

[0129] Optionally, the warning device includes a warning light, and the warning light can include but is not limited to any one of a CHINT alarm light, an LED warning light, etc.

[0130] For the pole piece slitting system provided by some embodiments of the present application, the warning device can adopt any one of the above components, which is beneficial to improving the use flexibility.

[0131] In some optional embodiments, the pole piece slitting system further includes a marking device, which is communicatively connected to the control component. The control component is further configured to determine that the pole piece 200 has rewound based on the parameter information and output a marking instruction, and the marking device is configured to receive the marking instruction to mark at the position where the pole piece 200 has rewound.

[0132] In some embodiments of the present application, for the pole piece slitting system, when the control component determines that the pole piece 200 has rewound according to the parameter information, it can output a marking instruction, and the marking device can receive the marking instruction to mark at the position where the pole piece 200 has rewound, so that the subsequent operator can process the rewound part of the pole piece 200, reminding the next production process to conduct key inspections.

[0133] Optionally, the marking device can mark the pole piece 200 by means of labeling, rolling, stamping, or air jetting.

[0134] Optionally, the marking device is arranged downstream of the slitting component 12, and it can mark the slit part of the pole piece 200.

[0135] Please refer to Figure 2 and Figure 4 , in some optional embodiments, the pole piece slitting system further includes an image acquisition device 30. The image acquisition device 30 is communicatively connected to the control component. The control component is further configured to determine that the pole piece 200 has rewound according to the parameter information and output an acquisition instruction. The control image acquisition device 30 is configured to receive the acquisition instruction to obtain the surface information of the position where the pole piece 200 has rewound.

[0136] The image acquisition device 30 can receive the acquisition instruction and is used to acquire the surface information of the pole piece 200 at the slitting device, and transmit this surface information to the control component.

[0137] For the pole piece slitting system provided by some embodiments of the present application, the operator can judge whether there is wire drawing at the position where the pole piece 200 has rewound according to the surface information acquired by the image acquisition device 30, so as to prompt that wire drawing occurs on the pole piece 200 and it needs to be processed, preventing the wire drawing from not being cleared in time and affecting the quality of the pole piece 200, which is beneficial to improving the forming quality of the pole piece 200 after slitting. Moreover, by setting the image acquisition device 30, it is beneficial to improve the automation design of the pole piece slitting system to reduce the working difficulty of the operator.

[0138] In some embodiments, the image acquisition device 30 can be communicatively connected to the control component through a control signal line.

[0139] In some other embodiments, the image acquisition device 30 can also be communicatively connected to the control component by means of wireless transmission.

[0140] The image acquisition device 30 can always acquire the surface information of the pole piece 200 at the slitting device, or, in some optional embodiments, the control component is further configured to control the start and stop of the image acquisition device 30.

[0141] By setting in the above manner, the image acquisition device 30 can collect the surface information of the pole piece 200 at the slitting device according to the instructions of the control component, which helps to save costs and avoid waste.

[0142] Specifically, when the pole piece 200 moves along the preset direction, the image acquisition device 30 always remains in the closed state. When the pole piece 200 moves in the direction opposite to the preset direction, the first roller body 111 rotates reversely. The control component determines that the pole piece 200 has rewound by detecting the parameter information sent by the device, and controls the image acquisition device 30 to turn on to collect the surface information of the pole piece 200 at the slitting device and send it to the control component.

[0143] Optionally, the control component can also be configured to set parameters such as the frame rate and resolution of the image acquisition device 30.

[0144] Optionally, the control component can also be configured to set the aperture, shutter speed, and gain of the image acquisition device 30 according to the actual image acquisition effect.

[0145] As Figure 4 shown, in some alternative embodiments, the image acquisition device 30 includes at least two photographing devices 31. At least one photographing device 31 is provided upstream of the slitting component 12, and at least one photographing device 31 is provided downstream of the slitting component 12.

[0146] For the pole piece slitting system provided by some embodiments of the present application, by setting in the above manner, it is beneficial to improve the accuracy of the image information of the pole piece 200 collected by the image acquisition device 30 at the slitting device.

[0147] The number of the photographing devices 31 can be set to two, three, or even more. The photographing device 31 can include but is not limited to any one of a CCD (Charge Coupled Device) camera, a mobile phone camera, a video camera, etc.

[0148] Optionally, the photographing device 31 is set as a CCD camera. A CCD is a semiconductor device that can convert optical images into digital signals and has the advantages of small size, light weight, not being affected by magnetic fields, and having anti-vibration and anti-impact. By setting in this way, it is beneficial to improve the accuracy of the surface information of the pole piece 200 collected at the rewinding position.

[0149] As Figure 4As shown in the figure, by way of example, two photographing devices 31 are provided upstream of the slitting assembly 12, and one of the photographing devices 31 is located above the pole piece 200 in the direction of its own thickness, and the other photographing device 31 is located below the pole piece 200 in the direction of its own thickness. Two photographing devices 31 are provided downstream of the slitting assembly 12, and one of the photographing devices 31 is located above the pole piece 200 in the direction of its own thickness, and the other photographing device 31 is located below the pole piece 200 in the direction of its own thickness.

[0150] In some alternative embodiments, the pole piece slitting system further includes a cleaning device, which is communicatively connected to the control assembly. The control assembly is further configured to determine that the pole piece 200 has wire drawing based on the surface information of the position where the pole piece 200 has rewound, and control the cleaning device to remove the wire drawing generated by the pole piece 200.

[0151] The control assembly can determine whether the pole piece 200 has wire drawing based on the image information of the position where the pole piece 200 has rewound. If it is determined that the pole piece 200 has wire drawing, an instruction to remove it is output to the cleaning device. After receiving the instruction to remove it, the cleaning device can remove the wire drawing generated by the pole piece 200.

[0152] The pole piece slitting system provided by some embodiments of the present application, configured in the above manner, can timely remove wire drawing, prevent the wire drawing from flowing out and affecting the overall quality of the pole piece 200, which is beneficial to improving the forming quality of the pole piece 200 after slitting. Moreover, by providing the cleaning device, it is beneficial to improve the automated design of the pole piece slitting system and reduce the work difficulty of the operator.

[0153] Optionally, the cleaning device may include clamping jaws, suction cups, etc. to remove the wire drawing on the pole piece 200.

[0154] The pole piece slitting system provided by the embodiments of the present application can be used in the battery technology field to slit the pole piece 200. Of course, it can also be used in other fields that require slitting, such as the thin film packaging field, the food production field, etc., which is beneficial to improving the quality of the product.

[0155] In some alternative embodiments, the slitting equipment may further include a frame, and the rolling assembly 11, the slitting assembly 12, the image acquisition device 30, and the marking device can all be installed on the frame.

[0156] According to some embodiments of the present application, the present application provides a battery production device, including the pole piece slitting system provided in any of the above embodiments, which is beneficial to improving the quality of the battery.

[0157] Please refer to Figure 2 and Figure 4, an embodiment of the present application provides a pole piece slitting system, including a slitting device, a detection device 20, a control component, a warning device, a marking device, and an image acquisition device 30

[0158] The slitting device includes a rolling component 11 and a slitting component 12. The rolling component 11 includes a first roller body 111 located upstream of the slitting component 12. The pole piece 200 forms a wrap angle area 201 at the first roller body 111. The rolling component 11 is configured to convey the pole piece 200, and the slitting component 12 is configured to slit the pole piece 200.

[0159] The detection device 20 includes an encoder. The detection device 20 is connected to the first roller body 111 and is configured to detect parameter information of the rolling component 11. The parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a rotation number of turns.

[0160] The control component is respectively communicatively connected to the slitting device, the detection device 20, the warning device, the marking device, and the image acquisition device 30. The control component is configured to determine that the pole piece 200 has reversed based on the parameter information detected by the detection device 20, control the slitting device to stop, control the warning device to emit an alarm signal, control the marking device to mark at the position where the pole piece 200 has reversed, and control the image acquisition device 30 to obtain the surface information of the position where the pole piece 200 has reversed.

[0161] Please refer to Figures 1 to 5 , an embodiment of the present application also provides a pole piece slitting method for the pole piece slitting system provided in any of the above embodiments. The pole piece slitting method includes:

[0162] Obtain the parameter information of the rolling component 11 through an encoder. The parameter information includes a rotation direction, a rotation speed, a rotation distance, a rotation time, and a rotation number of turns;

[0163] The control component determines that the pole piece 200 has reversed based on the rotation direction being different from the preset direction. The control component outputs a stop instruction to stop the slitting device, outputs an alarm instruction to cause the warning device to emit an alarm signal, outputs a marking instruction to cause the marking device to mark at the position where the pole piece 200 has reversed, and the control component calculates and records the length of the reversed pole piece 200 according to the parameter information;

[0164] According to the slitting device being in a stopped state, the control component outputs a collection instruction to cause the image acquisition device 30 to take a picture of the position where the pole piece 200 has reversed to obtain the surface information of the position where the pole piece 200 has reversed;

[0165] The control component determines that the pole piece 200 has drawn wire based on the surface information of the reversed position of the pole piece 200 and outputs a cleaning instruction to clean the drawn wire on the pole piece 200;

[0166] After removing the wire drawing on the electrode sheet 200, the control component sends a start command to start the slitting device. After the rolling component 11 rotates for a preset time, a stop command is sent to stop the slitting device. According to the fact that the slitting device is in a stopped state, the surface information of the position where the electrode sheet 200 rewound last time is obtained again.

[0167] It can be understood that after the electrode sheet 200 rewinds, there is a certain probability that the already slit tab will be slit again, resulting in the phenomenon of tab wire drawing. The tab wire drawing cannot be effectively detected in the subsequent processes after slitting, and there is a great risk of missed detection. When it is involved in the battery cell, it is likely to cause the risks of lithium plating and thermal runaway in the battery cell.

[0168] Therefore, effectively monitoring whether the electrode sheet 200 rewinds during the slitting process is the basis for effectively detecting and removing the wire drawing of the tab. The electrode sheet slitting method provided by some embodiments of the present application can not only effectively monitor the rewinding phenomenon of the electrode sheet 200 during the slitting process, but also further remove the tab wire drawing caused by the rewinding of the electrode sheet 200, so as to prevent the tab wire drawing from flowing out and damaging the forming quality of the electrode sheet 200 after slitting.

[0169] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0170] If there is no special description, all steps of the present application can be carried out in sequence or randomly, and preferably in sequence. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) carried out in sequence, or may include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0171] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for cutting a pole piece, used in a cutting device, the cutting device comprising a rolling assembly and a cutting assembly, the rolling assembly being configured to convey the pole piece, the cutting assembly being configured to cut the pole piece, characterized in that: The pole piece cutting method comprises: Acquiring parameter information of the rolling assembly, wherein the parameter information includes at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotations; Determining, according to the parameter information, that the pole piece is rewound, and outputting a shutdown instruction to stop the slitting device; According to the slitting device being in a stopped state, obtaining surface information of the position where the pole piece is rewound; Determining that wire drawing occurs on the pole piece according to surface information of the pole piece rewinding position, and outputting a clearing instruction to clear the wire drawing on the pole piece; After clearing the wire drawing on the pole piece, a start command is sent to start the slitting device. After the roller assembly rotates for a preset time, a stop command is sent to stop the slitting device. According to the slitting device being in the stop state, the surface information of the last rewinding position of the pole piece is obtained again.

2. The pole piece cutting method according to claim 1, characterized in that: The parameter information includes a rotation direction, and the step of determining that the pole piece is rewound according to the parameter information and outputting a shutdown instruction to stop the slitting device includes: According to the fact that the rotation direction is different from the preset direction, it is determined that the pole piece is rewound.

3. The pole piece cutting method according to claim 1, characterized in that: The pole piece cutting method further comprises: The length of the pole piece where rewinding occurs is calculated and recorded according to the parameter information.

4. The pole piece cutting method according to claim 1, characterized in that: The pole piece cutting method further comprises: The pole piece is judged to have rewound according to the parameter information, and an alarm instruction is output to send out an alarm signal.

5. The pole piece cutting method according to claim 1, characterized in that: The pole piece cutting method further comprises: It is determined based on the parameter information whether the pole piece has been rewound, and a marking instruction is output to mark the position where the pole piece has been rewound.

6. The pole piece cutting method according to claim 1, characterized in that: The step of obtaining the surface information of the pole piece rewinding position according to the slitting device being in a stopped state comprises: The position where the pole piece is rewound is photographed to obtain surface information of the position where the pole piece is rewound.

7. A pole piece cutting system, characterized in that: include: A slitting device, comprising a rolling assembly and a slitting assembly, wherein the rolling assembly is configured to convey the pole piece, and the slitting assembly is configured to slitting the pole piece; A detection device, disposed on the rolling assembly, the detection device being configured to detect parameter information of the rolling assembly, the parameter information including at least one of a rotation direction, a rotation speed, a rotation distance, a rotation time, and a number of rotations; Image acquisition equipment; cleaning device; A control component is respectively connected to the slitting device, the detection device, the image acquisition device and the cleaning device in communication, the control component is configured to determine whether the pole piece is rewound according to the parameter information detected by the detection device and output a stop and acquisition instruction, the slitting device is configured to receive the stop instruction to stop, and the image acquisition device is configured to receive the acquisition instruction to obtain surface information of the position where the pole piece is rewound; The control component is further configured to determine that the pole piece has wire drawing according to the image information of the rewinding position of the pole piece and output a clearing instruction, and the cleaning device is configured to receive the clearing instruction to clear the wire drawing generated by the pole piece; The control component is also configured to determine that the wire drawing generated by the pole piece has been cleared based on the image information of the rewinding position of the pole piece and output an instruction to start the preset time and stop. The slitting equipment is also configured to receive the instruction to start the preset time and stop to start the preset time and stop.

8. The pole piece cutting system according to claim 7, characterized in that: The rolling assembly comprises a first roller body, the first roller body is located upstream of the slitting assembly, the detection device is connected to the first roller body, and the pole piece forms an angled area at the first roller body.

9. The pole piece cutting system according to claim 7 or 8, characterized in that: The electrode slitting system also includes a warning device, which is communicatively connected to the control component. The control component is also configured to determine whether the electrode is rewound based on the parameter information and output an alarm instruction. The warning device is configured to receive the alarm instruction to issue an alarm signal.

10. The pole piece cutting system according to claim 7 or 8, characterized in that: The pole piece cutting system also includes a marking device, which is communicatively connected to the control component. The control component is also configured to determine whether the pole piece is rewound based on the parameter information and output a marking instruction. The marking device is configured to receive the marking instruction to mark the position where the pole piece is rewound.

11. The pole piece cutting system according to claim 7 or 8, characterized in that: The image acquisition device includes at least two shooting devices, at least one of the shooting devices is arranged upstream of the slitting component, and at least one of the shooting devices is arranged downstream of the slitting component.

12. A battery production device, characterized in that: Comprising a pole piece cutting system according to any one of claims 7 to 11.

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