An electrode sheet unwinding method and device, electronic equipment and storage medium

Abstract

The application provides a pole piece dividing method and device, electronic equipment and a storage medium. The method comprises the following steps: obtaining the length of a pole piece to be divided; determining, according to the length of the pole piece to be divided, that the pole piece to be divided is divided according to a dividing parameter meeting a preset condition, to obtain a divided pole piece. The preset condition comprises that the dividing parameter can divide the pole piece to be divided, and the length of each pole piece roll obtained after division is within a preset range. According to the length of the pole piece to be divided, the dividing parameter is determined, and the pole piece to be divided is divided according to the dividing parameter, so that the probability of the last divided pole piece roll being of an inappropriate length is reduced, and the waste of the pole piece is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to an electrode rewinding method, apparatus, electronic device, and storage medium. Background Technology

[0002] The current battery manufacturing process for vehicles includes a slitting process, which refers to cutting the large coil of electrode sheets output from the previous process into multiple smaller coils of electrode sheets according to the battery model being produced.

[0003] The existing slitting method involves unwinding large rolls of electrode sheets from the unwinding shaft while simultaneously winding them up from the rewinding shaft. When the length of the wound sheet reaches the machine's preset alarm diameter, it is slit to obtain smaller rolls of electrode sheets. Due to the process, the length of the large rolls of electrode sheets output from the previous process is not fixed each time. This results in the production of smaller rolls of electrode sheets of unsuitable length when slitting them according to the alarm diameter, leading to electrode waste. Summary of the Invention

[0004] The purpose of this application is to provide an electrode rewinding method, apparatus, electronic device, and storage medium to solve the problem of small-roll electrode sheets of unsuitable length during the electrode rewinding process.

[0005] In a first aspect, embodiments of this application provide a method for splitting electrode sheets, the method comprising: obtaining the length of the electrode sheet to be split; determining, based on the electrode sheet length, that if splitting parameters satisfying preset conditions exist, splitting the electrode sheet to be split according to the splitting parameters to obtain split electrode sheets. It is understood that the preset conditions include: the splitting parameters are capable of splitting the electrode sheet to be split, and the length of each electrode sheet roll obtained after splitting is within a preset range.

[0006] This application embodiment determines the slitting parameters based on the length of the electrode to be slit, and slits the electrode to be slit according to the slitting parameters, thereby reducing the probability of electrode rolls of unsuitable length at the end of the slitting process and improving the utilization rate of the electrode.

[0007] In any embodiment, the case where there is a volume segmentation parameter that meets the preset conditions includes: starting with the volume segmentation parameter as an initial value, determining whether the volume segmentation parameter meets the preset conditions; if not, updating the volume segmentation parameter until the obtained volume segmentation parameter meets the preset conditions, then determining that there is a volume segmentation parameter that meets the preset conditions.

[0008] In this embodiment, the existence of a pre-defined ...

[0009] In any embodiment, the case where there are splitting parameters that meet the preset conditions includes: starting with the splitting parameters as the initial value, determining whether the splitting parameters meet the preset conditions; if not, and the length of the split electrode after cutting is greater than the lower limit of the preset range calculated based on the current splitting parameters, then incrementing the splitting parameters until the obtained splitting parameters meet the preset conditions, then determining that there are splitting parameters that meet the preset conditions.

[0010] In this embodiment of the application, if the current roll-up parameter does not meet the preset conditions, it is first determined that if the length of the stripped electrode obtained after splitting the electrode according to the current roll-up parameter is greater than the lower limit of the preset range, then it means that the value of the roll-up parameter can be increased; otherwise, it can be concluded that there is no roll-up parameter that meets the preset conditions, thus reducing the amount of calculation.

[0011] In any embodiment, the electrode to be slit is slit according to the slitting parameters, including: if there are multiple slitting parameters that meet preset conditions, then the electrode to be slit is slit according to the slitting parameter with the smallest value. This embodiment reduces the number of slitting operations by slitting the electrode to be slit according to the slitting parameter with the smallest value that meets preset conditions.

[0012] In any embodiment, the electrode sheet to be cut is cut according to the winding parameters, including: if there are multiple winding parameters that meet preset conditions, the number of cells in the cut electrode sheet corresponding to each winding parameter is obtained; wherein, the number of cells is used to characterize the number of cells that can be wound in the cut electrode sheet; the electrode sheet to be cut is cut according to the winding parameters corresponding to the minimum value of the decimal part of the number of cells.

[0013] The embodiments of this application divide the electrode sheets to be divided according to the minimum winding parameters that meet the preset conditions and have no decimal places for the number of battery cells, thereby improving the utilization rate of the electrode sheets.

[0014] In any embodiment, the length difference of the electrode rolls obtained by cutting the electrode sheet to be cut according to the winding parameters is less than a preset threshold, so as to cut the electrode sheet to be cut as evenly as possible.

[0015] In any embodiment, the electrode to be cut is cut according to the winding parameters, including: monitoring the actual winding length; correcting the actual winding length using compensation parameters to obtain the corrected actual winding length; if the corrected actual winding length is equal to the length of the electrode roll, then a cutting is performed.

[0016] The embodiments of this application improve the accuracy of slitting by correcting the actual winding length through compensation parameters.

[0017] In any embodiment, the method further includes: obtaining the uniform tape speed during the splitting process and the recorded uniform winding length; and determining compensation parameters based on the uniform tape speed and the uniform winding length.

[0018] The embodiments of this application improve the accuracy of slitting by pre-determining compensation parameters and using these parameters to correct the actual winding length.

[0019] In any embodiment, if there are no slitting parameters that meet the preset conditions, the electrode to be slit is slit according to the upper limit of the preset range.

[0020] In this embodiment of the application, if there are no slitting parameters that meet the preset conditions, the electrode to be slitting is slitting according to the upper limit of the preset range to ensure the normal execution of the slitting process.

[0021] Secondly, embodiments of this application provide an electrode rewinding device, comprising: an acquisition module for acquiring the electrode length of the electrode to be rewinded; and a rewinding module for rewinding the electrode to be rewinded according to the rewinding parameters when there are rewinding parameters that meet preset conditions; wherein the preset conditions include: the rewinding parameters are capable of rewinding the electrode to be rewinded, and the length of each electrode roll obtained after rewinding is within a preset range.

[0022] Thirdly, embodiments of this application provide an electronic device, including: a processor, a memory, and a bus, wherein the processor and the memory communicate with each other via the bus; the memory stores program instructions that can be executed by the processor, and the processor can execute the method of the first aspect by calling the program instructions.

[0023] Fourthly, embodiments of this application provide a non-transitory computer-readable storage medium, comprising: the non-transitory computer-readable storage medium storing computer instructions, the computer instructions causing the computer to perform the method of the first aspect.

[0024] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart of an electrode rewinding method provided in an embodiment of this application;

[0027] Figure 2 This application provides a flowchart illustrating a method for determining whether a splitting parameter meets preset conditions.

[0028] Figure 3 A flowchart illustrating another method for determining whether a splitting parameter that meets preset conditions is provided in an embodiment of this application;

[0029] Figure 4 This is a schematic flowchart of another electrode rewinding method provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the electronic device settings page provided in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of an electrode rewinding device provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0039] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] In current cold-pressing equipment, a large roll of electrode sheet can be cut into multiple batches of smaller rolls after being rolled and slit by a slitting knife. During production, the large roll of electrode sheet is unwound, and simultaneously, the unwound sheet is wound up by a take-up shaft. When the length of the wound smaller rolls reaches the machine's preset alarm length, the slitting knife cuts the large roll of electrode sheet once, and the unwinding and winding operations stop. The operator removes the smaller rolls of electrode sheet from the take-up shaft. At this point, one cutting operation is completed. If the large roll of electrode sheet has not been completely cut, the unwinding and winding operations continue.

[0042] Due to manufacturing process limitations, the length of the large coil of electrode sheets output from the previous process is not fixed. Assuming the large coil is 100 meters long and the alarm length is 50 meters, it can be divided into two batches of smaller coils. If the large coil is 130 meters long, 30 meters will remain. However, the actual process assumes a length range of 40 meters to 60 meters for the smaller coils. A 30-meter coil is too short to be used as a separate small coil. Currently, there are two main approaches: First, discard the 30-meter coil, resulting in waste. Second, the operator uses tape to connect the 30-meter coil to the next batch of large coils and continues winding. This results in a splicing end in the smaller coils, which needs to be cut off in later processes. This cutting action discards an electrode sheet the length of a battery cell, thus also leading to waste. In addition, manually bonding the electrodes requires a lot of manpower and reduces the efficiency of the production process.

[0043] To prevent the production of small, improperly sized electrode rolls during the slitting process, the inventors discovered that since the process requires the length of the small electrode rolls obtained after slitting to be within a certain range, the alarm length can be dynamically adjusted based on the length of the large electrode rolls output from the previous process, as long as the alarm length remains within this range. This allows for obtaining small electrode rolls that meet the process requirements while also enabling the slitting of large electrode rolls.

[0044] Based on the above considerations, in order to solve the problem of small-length electrode sheets with unsuitable lengths during the rewinding process, the inventors, after in-depth research, proposed an electrode sheet rewinding method, namely, determining rewinding parameters that meet preset conditions based on the length of the electrode sheet to be rewound, and rewinding the electrode sheet to be rewound according to the rewinding parameters.

[0045] The electrode splitting method disclosed in this application can be used in scenarios where electrode splitting is required.

[0046] Figure 1 This is a schematic flowchart of an electrode rewinding method provided in an embodiment of this application, as shown below. Figure 1As shown, this method is applied to an electronic device, which can be a cold press or other equipment capable of slitting electrode sheets. This application does not specifically limit the specific type of device used. The method includes:

[0047] Step 101: Obtain the length of the electrode to be cut.

[0048] Step 102: If there are slitting parameters that meet the preset conditions, the electronic device will slit the electrode sheet to be slit according to the slitting parameters that meet the preset conditions.

[0049] In step 101, the electrode sheet to be cut can be a large coil electrode sheet output from the previous production process, or a large coil electrode sheet obtained by other means. The length of the electrode sheet can be measured in meters or by the EA value. The EA value of a large coil electrode sheet in the length direction refers to the number of cells that can be produced from the large coil electrode sheet in the length direction.

[0050] In step 102, the preset conditions include that the slitting parameters are capable of slitting the electrode sheets to be slit, and that the length of each electrode sheet roll obtained after slitting is within a preset range. It can be understood that the preset range is set in advance according to process requirements; it is a length interval including an upper and lower limit. For example, if the preset range is [45 meters, 50 meters], then the upper limit is 50 meters and the lower limit is 45 meters. The length of each electrode sheet roll obtained after slitting should be within this preset range.

[0051] Slitting parameters refer to the parameters used when slitting the electrode sheets to be diced. Slitting parameters can be either slitting batches or roll-to-roll batches. Slitting batches represent the number of times the electrode sheets to be diced are diced, while roll-to-roll batches represent the number of batches of electrode rolls obtained after slitting the electrode sheets. For example, if the roll-to-roll batch is 1, the electrode sheets to be diced need to be diced to obtain one batch of electrode rolls, meaning no dicing is performed along the length of the electrode sheets. If the roll-to-roll batch is 2, the electrode sheets to be diced need to be diced once, obtaining two batches of electrode rolls. It can be understood that a batch of electrode rolls can include one electrode roll or multiple electrode rolls; the specific number of electrode rolls in a batch is determined by the process settings. In the case of multiple electrode rolls, it is the result of dicing the electrode sheets to be diced along the width direction. The length direction refers to the axial direction of the roll formed by the electrode sheets to be diced, and the width direction refers to the radial direction of the roll.

[0052] This application embodiment determines the slitting parameters based on the length of the electrode to be slit, and slits the electrode to be slit according to the slitting parameters, thereby avoiding the occurrence of electrode rolls of unsuitable length at the end of the slitting process, and thus improving the utilization rate of the electrode.

[0053] Based on the above embodiments, after obtaining the length of the electrode to be cut, it can be determined in advance whether there are slitting parameters that meet preset conditions. The determination method is as follows: Figure 2 As shown, the method includes:

[0054] Step 201: Set the splitting parameters to initial values.

[0055] Step 202: Determine whether the splitting parameter can split the electrode sheet to be split, and whether the length of each split electrode sheet roll is within the preset range. If not, proceed to step 203; if so, it means that there is a splitting parameter that meets the preset conditions.

[0056] Step 203: If the current splitting parameters do not meet the preset conditions, update the corresponding values ​​of the splitting parameters and continue to execute step 202.

[0057] It should be noted that the entity performing steps 201-203 above can be an electronic device.

[0058] In step 201, the initial value can be preset manually on the electronic device. For example, it can be set to 1, or it can be 0, 2, 3... The initial value can be preset according to the actual situation.

[0059] In step 202, if the electronic device determines that the splitting parameter meets the preset conditions, it can be determined that there are splitting parameters that meet the preset conditions.

[0060] In step 203, taking the roll-to-roll parameter as an example, if the current roll-to-roll batch does not meet the preset conditions, the value corresponding to the roll-to-roll batch can be updated. For example, the value corresponding to the roll-to-roll batch can be increased or decreased based on the current roll-to-roll batch. When increasing the value corresponding to the roll-to-roll batch, the roll-to-roll batch can be incremented by 1 each time, or it can be incremented by 2, 3, etc., depending on the actual situation. This embodiment does not specifically limit this. If the roll-to-roll batch value still does not meet the preset conditions after increasing to its maximum value, the increment of the roll-to-roll batch value is stopped, and it is concluded that no roll-to-roll batch meets the preset conditions. Alternatively, after obtaining the value of the newly added roll-to-roll batch, if the length of the obtained electrode roll after slicing the electrode sheet using the increased roll-to-roll batch value is less than the lower limit of the preset range, the increment of the roll-to-roll batch value is stopped, and it is concluded that no roll-to-roll batch meets the preset conditions. It should also be noted that if the current roll-to-roll batch meets the preset conditions, step 203 can continue to be executed until the preset maximum value of the roll-to-roll batch is reached. It is understood that the maximum value of the volume batch can also be preset, and in this embodiment of the application, the maximum value of the volume batch is greater than the initial value.

[0061] When reducing the value corresponding to a volume batch, the volume batch can be reduced by 1 each time. Alternatively, it can be reduced by 2, 3, etc., depending on the actual situation. This application embodiment does not specifically limit this. If the volume batch is reduced to its minimum value and still does not meet the preset condition, the reduction of the volume batch value is stopped, and it is concluded that no volume batch meets the preset condition. It is understood that for the method of decreasing volume batches, the initial value should be greater than the minimum value of the volume batch. The minimum value of the volume batch can be 1, 2, etc., or other values. This application embodiment does not specifically limit this.

[0062] In this embodiment, the existence of a pre-defined ...

[0063] In another embodiment, Figure 3 A flowchart illustrating another method for determining whether a splitting parameter that meets preset conditions exists, as provided in this application embodiment, is shown below. Figure 3 As shown, the method includes:

[0064] Step 301: Set the splitting parameters to initial values.

[0065] Step 302: Determine whether the splitting parameter can split the electrode sheet to be split, and whether the length of each split electrode sheet roll is within the preset range. If not, proceed to step 203; if so, it means that there is a splitting parameter that meets the preset conditions.

[0066] Step 303: The electronic device determines whether the length of the slit electrode after splitting, calculated based on the current splitting parameters, is greater than the lower limit of the preset range. If so, proceed to step 304; otherwise, it indicates that there are no splitting parameters that meet the preset conditions.

[0067] Step 304: If the length of the slit electrode corresponding to the current slitting parameter is greater than the lower limit of the preset range, then increase the value corresponding to the slitting parameter and continue to execute step 302.

[0068] It should be noted that the execution subject corresponding to steps 301-304 above can be an electronic device.

[0069] In step 301, the initial value can be preset manually on the electronic device. For example, it can be set to 1, or it can be 0, 2, 3... The initial value can be preset according to the actual situation. This application embodiment does not make specific limitations on this.

[0070] In step 302, if it is determined that the splitting parameter meets the preset conditions, then it can be confirmed that there is a splitting parameter that meets the preset conditions. Steps 303-304 can then be executed until the preset maximum value of the splitting parameter is reached. It is understood that the maximum value of the splitting parameter can also be preset, and in this embodiment, the maximum value of the splitting parameter is greater than the initial value.

[0071] In step 304, when increasing the value corresponding to the split parameter, the split parameter can be incremented by 1 each time. Of course, it can also be incremented by 2, 3, etc., each time, depending on the actual situation. This application embodiment does not specifically limit this. If the split parameter is increased to its maximum value and still does not meet the preset condition, the increase of the split parameter value is stopped, and the conclusion is drawn that there is no split parameter that meets the preset condition.

[0072] In this embodiment of the application, if the current roll-up parameter does not meet the preset conditions, it is first determined that if the length of the stripped electrode obtained after splitting the electrode according to the current roll-up parameter is greater than the lower limit of the preset range, then it means that the value of the roll-up parameter can be increased; otherwise, it can be concluded that there is no roll-up parameter that meets the preset conditions, thus reducing the amount of calculation.

[0073] Based on the above embodiments, there may be one or more winding parameters that meet the preset conditions. In the case where there are multiple winding parameters that meet the preset conditions, when the electronic device is cutting the electrode sheet to be cut, it can select the winding parameter with the smallest value from the multiple winding parameters that meet the preset conditions, and cut the electrode sheet to be cut according to the winding parameter with the smallest value.

[0074] In the actual implementation process, after the electrode sheets to be cut into electrode rolls, the beginning and end of the electrode rolls are coated with adhesive, making the coated electrode sheets unusable. Therefore, they are cut off in the next process. Since a smaller value for the cutting parameter results in a longer length for each electrode roll and fewer electrode rolls obtained, and if the length of electrode sheets cut off from each electrode roll is equal, then fewer electrode rolls and a smaller total length of cut electrode sheets are achieved. Based on these considerations, when multiple cutting parameters satisfy preset conditions exist, the electronic device can cut the electrode sheets to be cut according to the cutting parameter with the smallest value.

[0075] This application embodiment reduces the number of slitting operations by slitting the electrode sheet to be slitted according to the minimum slitting parameter that meets preset conditions.

[0076] In another embodiment, there may be one or more winding parameters that meet the preset conditions. If there are multiple winding parameters that meet the preset conditions, the electronic device obtains the number of cells of the electrode sheet after slicing corresponding to each winding parameter, and slices the electrode sheet to be sliced ​​according to the winding parameter corresponding to the minimum value of the decimal part of the number of cells.

[0077] In the specific implementation process, after the electronic equipment cuts the electrode sheet to be split, if the subsequent processes do not require cutting off the beginning and end of the electrode sheet roll, and the number of cells that can be wound from the split electrode sheet according to the splitting parameters is not an integer (e.g., 30.5EA), it means that the electrode sheet roll can wind 30 complete cells, with 0.5 cells of electrode sheet length remaining. This remaining 0.5 cells of electrode sheet length is unusable and needs to be discarded, resulting in electrode waste. Therefore, to reduce electrode waste, after obtaining multiple splitting parameters that meet preset conditions, the splitting parameter with the decimal part of the cell number as the minimum value is selected, and the electrode sheet to be split is cut using this splitting parameter. For example, if the cell counts corresponding to the preset winding parameters are 30.1EA, 45.6EA, and 54.8EA, then the decimal part of 30.1EA is the smallest, at 0.1. Therefore, the winding parameters corresponding to 30.1EA are used to cut the electrode sheet to be cut. As another example, if the cell counts corresponding to the preset winding parameters are 20.0EA and 36.5EA, then the winding parameters corresponding to 20.0EA can be used to cut the electrode sheet to be cut.

[0078] In this embodiment, the electrode sheets to be cut are cut according to the minimum number of decimals of the number of battery cells that meet the preset conditions, thereby reducing the waste of electrode sheets in the electrode sheet roll and improving the utilization rate of the electrode sheets.

[0079] Based on the above embodiments, the length difference of the electrode rolls obtained by the electronic device in cutting the electrode to be cut according to the winding parameters is less than a preset threshold.

[0080] An electrode roll refers to a small roll of slit electrodes obtained after the electrodes to be slit are cut. The preset threshold is pre-set, for example, it can be 1 meter, or 0.5EA, etc. This application embodiment does not limit the specific value of the preset threshold.

[0081] In order to ensure that the electrode sheets to be slit are slit uniformly, when determining the slitting parameters, the slitting parameters are selected such that the length difference of the electrode rolls obtained after slitting the electrode sheets to be slit is less than the preset threshold.

[0082] This application embodiment limits the length difference of the electrode rolls to less than a preset threshold, so that the electrode to be cut can be cut as evenly as possible.

[0083] Based on the above embodiments, during the slitting process, the cold-pressed electrode sheet to be slit can be wound up using a winding shaft. Electronic equipment monitors the actual winding length and corrects it using compensation parameters to obtain the corrected actual winding length. If the electronic equipment detects that the corrected actual winding length is equal to the length of the electrode sheet roll calculated based on the slitting parameters, then a slitting operation is performed.

[0084] In practical implementation, the electronic device can monitor the actual winding length of the electrode sheet to be cut on the take-up shaft in real time. The monitoring method can include recording the number of revolutions of other shafts using encoders on those shafts, and calculating the actual winding length based on the number of revolutions and the radius of other shafts. It is understood that the electronic device includes not only the take-up shaft but also other shafts to assist in winding. The actual winding length can also be calculated using the rotational speed of the take-up shaft and the winding time. This application does not limit the specific monitoring method for the actual winding length.

[0085] During the winding process of the electrode sheet to be cut using a take-up shaft, slippage may occur between the electrode sheet and the take-up shaft, resulting in inaccurate monitoring of the actual winding length. To improve the accuracy of obtaining the electrode sheet roll, this embodiment uses a compensation parameter to correct the actual winding length, thereby obtaining a corrected actual winding length. The electronic device determines whether the corrected actual winding length is equal to the length of the electrode sheet roll; if they are equal, a cutting operation is performed.

[0086] The embodiments of this application improve the accuracy of slitting by correcting the actual winding length through compensation parameters.

[0087] Based on the above embodiments, the present application embodiments pre-calculate compensation parameters according to the following method: the electronic device acquires the uniform tape speed during the slitting process and records the average speed winding length at the uniform tape speed, and then determines the compensation parameters based on the average speed tape speed and the average speed winding length.

[0088] In specific implementation, the uniform belt speed refers to the unwinding speed of the electrode sheet to be cut, wound on the unwinding shaft, during the unwinding process at a uniform speed. The unit of this uniform belt speed can be meters per minute, or of course, meters per second; this application embodiment does not specifically limit this. When the electronic device rewinds the electrode sheet to be cut, it records its rewinding length. The uniform speed rewinding length refers to the length of the electrode sheet to be cut that the rewinding shaft rewinds during the unwinding process at a uniform belt speed.

[0089] After obtaining the uniform belt speed and uniform winding length, the theoretical winding length is calculated based on the uniform belt speed and time. The ratio of the theoretical winding length to the uniform winding length is used as a compensation parameter.

[0090] After obtaining the compensation parameters, the product of the actual winding length and the compensation parameters is used as the corrected actual winding length.

[0091] For example: If the conveyor belt speed is 80 m / min, and after 3 minutes of unwinding and rewinding at this speed, the theoretical winding length is 240 m. If the electronic equipment records an actual winding length of 230 m, then the compensation parameter is 240 / 230. During the actual winding process, the electronic equipment can periodically correct the recorded actual winding length. If the actual winding length is 460 m, then the corrected actual winding length is:

[0092] The embodiments of this application improve the accuracy of slitting by pre-determining compensation parameters and using these parameters to correct the actual winding length.

[0093] Based on the above embodiments, after obtaining the length of the electrode sheet to be slit, it can be determined in advance whether there are slitting parameters that meet preset conditions. The determination method is the same as in the above embodiments and will not be repeated here. If there are no slitting parameters that meet preset conditions, in order to ensure that the slitting process is executed normally, any value within a preset range can be used as the length of the electrode roll obtained after slitting the electrode sheet to be slit.

[0094] In another embodiment, the electrode to be diced can be diced according to the upper limit of a preset range.

[0095] In the specific implementation process, after the electrode sheets to be slit are obtained into electrode rolls, the beginning and end of the electrode rolls are coated with adhesive, making the coated electrode sheets unusable. Therefore, they are cut off in the next process. Since a smaller value for the slitting parameter results in a longer length for each electrode roll and a smaller number of electrode rolls obtained, if the length of the electrode sheets cut off from each electrode roll is equal, then the number of electrode rolls is smaller, and the total length of the cut electrode sheets is smaller. Based on these considerations, when multiple slitting parameters satisfy preset conditions exist, the upper limit of the preset range can be used as the length of the electrode roll to slit the electrode sheets to be slit, thereby obtaining a smaller number of electrode rolls.

[0096] In this embodiment, if there are no slitting parameters that meet the preset conditions, the electrode to be slitting is slitting according to the upper limit of the preset range, which ensures the normal execution of the slitting process while reducing the waste of electrode sheets.

[0097] Figure 4 This is a schematic flowchart of another electrode rewinding method provided in an embodiment of this application, as shown below. Figure 4As shown, this method can also be applied to electronic devices, and taking the volume splitting parameter as an example, it includes:

[0098] Step 401: Obtain the number of coils. Different cell models correspond to different electrode widths. For electrode sheets of a fixed width, when producing electrode sheets for different cell models, the number of coils can be pre-selected on the electronic device, or the default number of coils on the electronic device can be used. The number of coils refers to the number of electrode rolls that can be obtained by cutting the large coil of electrode sheets into multiple parts in the radial direction. Therefore, a slitting blade is provided in the axial direction of the large coil of electrode sheets, which can cut the electrode sheets to be cut into multiple parts in the width of the electrode sheet. For example, if 1 to 3 is selected in the electronic device, the electrode sheets to be cut can be cut into 3 parts in the width of the electrode sheet.

[0099] Step 402: Obtain the EA value of the electrode to be split; it can be understood that the EA value of the electrode to be split can be obtained from the previous process.

[0100] Step 403: Determine if the machine's operating speed is greater than 30 m / min. The machine's operating speed determines whether it is operating normally. If the machine's operating speed is greater than 30 m / min, it indicates that it is operating normally, and proceed to step 404. Otherwise, it indicates that the machine is not operating normally, which may be due to manual roll changing or a machine malfunction. In this case, continue monitoring the operating speed. It is understood that this machine refers to a machine used for slitting, i.e., electronic equipment. This machine can also be a machine that communicates with electronic equipment to perform slitting operations on the electrode sheets to be slit. The electronic equipment is used to determine the slitting batch and, after confirming that the winding length meets the requirements, controls the machine to perform the slitting.

[0101] Step 404: Determine whether the electrode sheet to be cut can be evenly divided; the electronic device can sequentially determine whether the electrode sheet to be cut is evenly divided into batch 1, batch 2, batch 3 and batch 4, and determine whether the length of each small roll is within the preset range after the electrode sheet to be cut is cut.

[0102] For example, for ease of description, the roll of electrodes to be cut is called a large roll, and the roll of electrodes obtained after cutting the electrodes is called a small roll. Taking a MEB with a total EA value of 3015EA from the large roll of coated material as an example (where the EA value of the large roll is 1005EA in the length direction and 3EA in the width direction), the upper limit of the EA value of the small roll is set to 550EA and the lower limit is 360EA.

[0103] MEB battery cells are manufactured in a 1-to-3 configuration during the cold pressing process, meaning each batch of small rolls shipped contains 3 rolls. Figure 5As shown. First, determine whether the large roll can be divided equally into 3 smaller rolls in one batch. The calculation yields: 3015EA ÷ 3 = 1005EA.

[0104] 1005EA is not between the set upper limit (550EA) and lower limit (360EA) of the small roll EA, so it is impossible to complete the splitting of this large roll in one batch. That is, this large roll is not suitable for being divided into 3 small rolls.

[0105] Next, determine whether the large roll can be divided equally into two batches, that is, whether the large roll can be divided into 6 smaller rolls. 3015EA ÷ 6 = 502.5EA.

[0106] 502.5EA falls precisely between the set upper limit (550EA) and lower limit (360EA) of the small roll EA, so the large roll can be divided into 6 small rolls in two batches.

[0107] At this point, the program calculation is complete, dividing this 3015EA roll into two batches, with three smaller rolls in each batch, for a total of six smaller rolls. Each smaller roll is 502.5 EAs long.

[0108] If the portions can be divided equally, proceed to step 406; otherwise, proceed to step 405.

[0109] Step 405: Divide the data according to the upper limit of the preset range;

[0110] Step 406: Cut the electrode sheet to be cut according to the calculated length. If it can be evenly divided, calculate the length of each electrode sheet roll after cutting based on the length of the electrode sheet to be cut and the batch of rolls that meet the preset conditions, and cut the electrode sheet to be cut according to this length. That is, when the cold press roll reaches 502.5 EA meters, the machine will alarm and stop.

[0111] Understandably, before each slitting step in steps 405 and 406, an alarm can be triggered to stop the machine, i.e., stop unwinding and rewinding. After slitting with the slitting blade, the electrode roll is removed. If there are still electrode sheets remaining to be slit, i.e., the slitting of the electrode sheets is not yet complete, then step 405 or step 406 continues until all the electrode sheets to be slit are cut. Through the above process, electrode waste can be reduced.

[0112] Figure 6 This is a schematic diagram of an electrode rewinding device provided in an embodiment of this application. The device can be a module, program segment, or code on an electronic device. It should be understood that this device is similar to the one described above. Figure 1 The method implementation corresponds to this and can be executed. Figure 1The various steps involved in the method embodiment, and the specific functions of the device, can be found in the description above. To avoid repetition, detailed descriptions are appropriately omitted here. The device includes: an acquisition module 601 and a segmentation module 602, wherein:

[0113] The acquisition module 601 is used to acquire the length of the electrode sheet to be cut; the cutting module 602 is used to cut the electrode sheet to be cut according to the cutting parameters when there are cutting parameters that meet preset conditions; wherein, the preset conditions include that the cutting parameters can cut the electrode sheet to be cut, and the length of each electrode sheet roll obtained after cutting is within a preset range.

[0114] Based on the above embodiments, there are cases where the splitting parameters meet preset conditions, including:

[0115] Starting with the initial value of the split parameters, it is determined whether the split parameters meet the preset conditions; if not, the split parameters are incremented until the obtained split parameters meet the preset conditions, then it is determined that there are split parameters that meet the preset conditions.

[0116] Based on the above embodiments, there are cases where the splitting parameters meet preset conditions, including:

[0117] Starting with the initial value of the splitting parameters, determine whether the splitting parameters meet the preset conditions; if not, and the length of the split electrode after splitting is greater than the lower limit of the preset range calculated based on the current splitting parameters, then increment the splitting parameters until the obtained splitting parameters meet the preset conditions, then it is determined that there are splitting parameters that meet the preset conditions.

[0118] Based on the above embodiments, the segmentation module 602 is specifically used to: if there are multiple segmentation parameters that meet the conditions, then segment the electrode sheet according to the segmentation parameter with the smallest value.

[0119] Based on the above embodiments, the segmentation module 602 is specifically used for:

[0120] If there are multiple winding parameters that meet the preset conditions, the number of cells in the slit electrode sheet corresponding to each winding parameter is obtained; wherein, the number of cells is used to characterize the number of cells that can be wound in the slit electrode sheet; the electrode sheet to be slit is slit according to the winding parameter corresponding to the minimum value of the decimal part of the number of cells.

[0121] Based on the above embodiments, the slitting module 602 is specifically used to: divide the electrode rolls obtained by slitting the electrode to be slitting according to the slitting parameters into a length difference that is less than a preset threshold.

[0122] Based on the above embodiments, the slitting module 602 is specifically used for: monitoring the actual winding length; correcting the actual winding length using compensation parameters to obtain the corrected actual winding length; and performing a slitting operation if the corrected actual winding length is equal to the length of the electrode roll.

[0123] Based on the above embodiments, the device further includes:

[0124] The parameter determination module is used to obtain the uniform tape speed during the splitting process and the recorded uniform winding length; and to determine the compensation parameters based on the uniform tape speed and the uniform winding length.

[0125] Based on the above embodiments, the slitting module 602 is further configured to: if there are no slitting parameters that meet the preset conditions, then slitting the electrode to be slitted according to the upper limit of the preset range.

[0126] Figure 7 This is a schematic diagram of the physical structure of the electronic device provided in the embodiments of this application, such as... Figure 7 As shown, the electronic device includes: a processor 701, a memory 702, and a bus 703; wherein,

[0127] The processor 701 and the memory 702 communicate with each other via the bus 703;

[0128] The processor 701 is used to call program instructions in the memory 702 to execute the methods provided in the above-described method embodiments, such as: obtaining the electrode length of the electrode to be cut; and cutting the electrode to be cut according to the cutting parameters if there are cutting parameters that meet preset conditions; wherein the preset conditions include: the cutting parameters are capable of cutting the electrode to be cut, and the length of each electrode roll obtained after cutting is within a preset range.

[0129] The processor 701 can be an integrated circuit chip with signal processing capabilities. The processor 701 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor.

[0130] The memory 702 may include, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0131] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided in the above-described method embodiments, such as: obtaining the length of the electrode sheet to be slit; and, if there are slitting parameters that meet preset conditions, slitting the electrode sheet to be slit according to the slitting parameters; wherein the preset conditions include: the slitting parameters are capable of slitting the electrode sheet to be slit, and the length of each electrode sheet roll obtained after slitting is within a preset range.

[0132] This embodiment provides a non-transitory computer-readable storage medium storing computer instructions that cause the computer to execute the methods provided in the above-described method embodiments, such as: obtaining the length of the electrode sheet to be slit; and, if there are slitting parameters that meet preset conditions, slitting the electrode sheet to be slit according to the slitting parameters; wherein the preset conditions include: the slitting parameters are capable of slitting the electrode sheet to be slit, and the length of each electrode sheet roll obtained after slitting is within a preset range.

[0133] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0134] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0136] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0137] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for rewinding electrode sheets, characterized in that, include: Obtain the length of the electrode to be cut; When the slitting parameters meet preset conditions, the electrode sheet to be slitted is slitted according to the slitting parameters; wherein, the preset conditions include: the slitting parameters are capable of slitting the electrode sheet to be slitted, and the length of each electrode sheet roll obtained after slitting is within a preset range; the slitting parameters are parameters used when slitting the electrode sheet to be slitted, and the slitting parameters are either slitting batches or slitting batches, wherein the slitting batches are used to characterize the number of times the electrode sheet to be slitted is slitted, and the slitting batches are used to characterize the number of batches of electrode sheet rolls obtained after slitting the electrode sheet to be slitted; the preset range allows each electrode sheet roll obtained after slitting to be treated as a separate small roll electrode sheet; The step of slicing the electrode sheet to be sliced ​​according to the slicing parameters includes: if there are multiple slicing parameters that satisfy the preset conditions, then obtaining the number of cells in the sliced ​​electrode sheet corresponding to each slicing parameter; wherein the number of cells is used to characterize the number of cells that can be wound around the sliced ​​electrode sheet; and slicing the electrode sheet to be sliced ​​according to the slicing parameter corresponding to the minimum value of the decimal part of the number of cells.

2. The method according to claim 1, characterized in that, The existence of a split-volume parameter that meets the preset conditions includes: starting with the split-volume parameter as an initial value, determining whether the split-volume parameter meets the preset conditions; if not, updating the split-volume parameter until the obtained split-volume parameter meets the preset conditions, then determining that there is a split-volume parameter that meets the preset conditions.

3. The method according to claim 1, characterized in that, The existence of a splitting parameter that meets the preset conditions includes: starting with the splitting parameter as an initial value, determining whether the splitting parameter meets the preset conditions; if it does not meet the conditions, and the average length of the split electrode after division calculated based on the current splitting parameter is greater than the lower limit of the preset range, then the splitting parameter is incremented until the obtained splitting parameter meets the preset conditions, then it is determined that there is a splitting parameter that meets the preset conditions.

4. The method according to claim 1, characterized in that, The length difference of the electrode rolls obtained by cutting the electrode to be cut according to the cutting parameters is less than a preset threshold.

5. The method according to claim 1, characterized in that, The step of cutting the electrode sheet to be cut according to the splitting parameters includes: monitoring the actual winding length; correcting the actual winding length using compensation parameters to obtain the corrected actual winding length; and if the corrected actual winding length is equal to the length of the electrode sheet roll, then a cutting is performed.

6. The method according to claim 5, characterized in that, The method further includes: obtaining the uniform tape speed during the splitting process and the recorded uniform winding length; and determining the compensation parameter based on the uniform tape speed and the uniform winding length.

7. An electrode rewinding device, characterized in that, include: The acquisition module is used to obtain the length of the electrode sheet to be cut; A slicing module is used to slice the electrode sheet to be sliced ​​according to the slicing parameters when there are slicing parameters that meet preset conditions. The preset conditions include: the slicing parameters are capable of slicing the electrode sheet to be sliced, and the length of each electrode sheet roll obtained after slicing is within a preset range; the slicing parameters are parameters used when slicing the electrode sheet to be sliced, and the slicing parameters are either slicing batches or slicing batches. The slicing batches represent the number of times the electrode sheet to be sliced ​​is sliced, and the slicing batches represent the number of batches of electrode sheet rolls obtained after slicing the electrode sheet to be sliced; the preset range allows each electrode sheet roll obtained after slicing to be treated as a separate small roll electrode sheet. Specifically, the slitting module is used to obtain the number of cells in the slitting electrode corresponding to each slitting parameter if there are multiple slitting parameters that meet the preset conditions; wherein the number of cells is used to characterize the number of cells that can be wound around the slitting electrode; and to slitting the electrode to be slitting according to the slitting parameter corresponding to the minimum value of the decimal part of the number of cells.

8. The apparatus according to claim 7, characterized in that, The existence of a split-volume parameter that meets the preset conditions includes: starting with the split-volume parameter as an initial value, determining whether the split-volume parameter meets the preset conditions; if not, updating the split-volume parameter until the obtained split-volume parameter meets the preset conditions, then determining that there is a split-volume parameter that meets the preset conditions.

9. The apparatus according to claim 7, characterized in that, The existence of a splitting parameter that meets the preset conditions includes: starting with the splitting parameter as an initial value, determining whether the splitting parameter meets the preset conditions; if it does not meet the conditions, and the average length of the split electrode after division calculated based on the current splitting parameter is greater than the lower limit of the preset range, then the splitting parameter is incremented until the obtained splitting parameter meets the preset conditions, then it is determined that there is a splitting parameter that meets the preset conditions.

10. The apparatus according to claim 7, characterized in that, The length difference of the electrode rolls obtained by cutting the electrode to be cut according to the cutting parameters is less than a preset threshold.

11. The apparatus according to claim 7, characterized in that, The slitting module is specifically used for: monitoring the actual winding length; correcting the actual winding length using compensation parameters to obtain the corrected actual winding length; and performing a slitting operation if the corrected actual winding length is equal to the length of the electrode roll.

12. The apparatus according to claim 11, characterized in that, The device further includes: a parameter determination module, used to acquire the uniform tape speed during the slitting process and the recorded uniform winding length; and to determine the compensation parameter based on the uniform tape speed and the uniform winding length.

13. An electronic device, characterized in that, include: A processor, a memory, and a bus, wherein the processor and the memory communicate with each other via the bus; The memory stores program instructions that can be executed by the processor, and the processor can invoke the program instructions to perform the method as described in any one of claims 1-6.

14. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions, which, when executed by a computer, cause the computer to perform the method as described in any one of claims 1-6.

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