Control method and control device for battery cell production

Abstract

The present application provides a control method and a control device for producing a battery cell, including: determining multiple first target thicknesses according to the thicknesses of multiple target pole pieces, the target pole piece is a positive pole piece or a negative pole piece; obtaining the thicknesses of multiple target diaphragms, obtaining multiple second target thicknesses, the target diaphragm is a first diaphragm or a second diaphragm, the first diaphragm is a diaphragm wound on the innermost circle negative pole piece, and the second diaphragm is a diaphragm between any adjacent positive pole piece and negative pole piece; calculating the spacing between two adjacent target pole ears according to at least the first target thickness and the second target thickness, obtaining the target spacing, the polarity of the two adjacent target pole ears is the same, and the first target thickness, the second target thickness and the target spacing correspond one to one; according to the target spacing, controlling multiple target pole pieces to perform cutting and winding processing to obtain a target battery cell. This method solves the technical problem of how to improve the yield of battery cells in the prior art.

Description

Technical Field

[0001] The present application relates to the field of lithium batteries, and in particular to a control method and a control device for producing a battery cell. Background Art

[0002] In the winding process of the battery cell, poor alignment of the tabs is one of the reasons for the low yield of the battery cell. Therefore, there is an urgent need for a method to improve the alignment of the tabs and thus improve the yield of battery cell production. Summary of the invention

[0003] The main purpose of the present application is to provide a control method and a control device for battery cell production, so as to at least solve the problem of how to improve the battery cell yield in the prior art.

[0004] According to one aspect of the present application, a control method for producing a battery cell is provided, comprising: obtaining the thickness of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thickness of the plurality of target electrode sheets, wherein the thickness of the target electrode sheet corresponds to the first target thickness one-to-one, and the target electrode sheet is a positive electrode sheet or a negative electrode sheet; obtaining the thickness of a plurality of target separators to obtain a plurality of second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and the negative electrode sheet; calculating the spacing between two adjacent target electrode ears according to at least the first target thickness and the second target thickness to obtain a target spacing, wherein the target electrode ear is a conductor led out from the target electrode sheet, the target electrode ear is a positive electrode ear or a negative electrode ear, the polarity of the two adjacent target electrode ears is the same, and the first target thickness, the second target thickness and the target spacing correspond one-to-one; according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain a target battery cell.

[0005] Optionally, multiple first target thicknesses are determined based on the thicknesses of multiple target pole pieces, including: rolling multiple first preliminary pole pieces to obtain multiple processed pole pieces, and obtaining the thicknesses of multiple processed pole pieces to obtain multiple first preliminary thicknesses; determining whether the multiple processed pole pieces stop deforming, and when the multiple processed pole pieces stop deforming, obtaining the thickness of the processed pole pieces to obtain multiple second preliminary thicknesses; calculating the ratio of the average value of the multiple first preliminary thicknesses to the average value of the multiple second preliminary thicknesses to obtain a thickness correction coefficient; and using the thickness correction coefficient to correct the thickness of each target pole piece to obtain multiple first target thicknesses.

[0006] Optionally, the thickness of each target pole piece is corrected using the thickness correction coefficient to obtain multiple first target thicknesses, including: calculating multiple first target thicknesses based on at least the product of the thickness of the target pole piece and the thickness correction coefficient.

[0007] Optionally, the spacing between two adjacent target pole ears is calculated based on at least the first target thickness and the second target thickness to obtain the target spacing, including: obtaining a gap coefficient and a winding needle circumference, wherein the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the winding needle circumference is used to characterize the circumference of a winding needle of a winding machine that winds the target battery cell; the target spacing is calculated based on the first target thickness, the second target thickness, the gap coefficient and the winding needle circumference.

[0008] Optionally, obtaining the gap coefficient includes: obtaining the spacing between any two adjacent second preliminary pole pieces among a plurality of second preliminary pole pieces to obtain a plurality of preliminary spacings, wherein the alignment of the pole ears on each of the second preliminary pole pieces is less than an alignment threshold; and calculating an average value of the plurality of preliminary spacings to obtain the gap coefficient.

[0009] Optionally, the target spacing is calculated based on the first target thickness, the second target thickness, the gap coefficient and the winding needle circumference, including: calculating the spacing between two adjacent positive electrode tabs and the spacing between two adjacent negative electrode tabs based on the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm, respectively, to obtain the target spacing.

[0010] Optionally, according to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm, the distance between two adjacent positive electrode tabs is calculated to obtain the target distance, including: according to the formula , calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab ,in, is the circumference of the winding needle, is the gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second diaphragm.

[0011] Optionally, according to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm, the distance between two adjacent negative electrode tabs is calculated to obtain the target distance, including: according to the formula , calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab ,in, is the circumference of the winding needle, is the gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second diaphragm.

[0012] Optionally, according to the target spacing, multiple target pole pieces are controlled to be cut and wound to obtain a target battery cell, including: according to the target spacing, multiple target pole pieces are controlled to be cut and wound to obtain multiple cut pole pieces, wherein any one of the cut pole pieces includes a target pole ear; multiple cut pole pieces and multiple target diaphragms are controlled to be wound to obtain the target battery cell.

[0013] According to another aspect of the present application, a control device for producing a battery cell is provided, comprising: a first acquisition unit, used to acquire the thickness of a plurality of target pole pieces, and determine a plurality of first target thicknesses according to the thickness of the plurality of target pole pieces, wherein the thickness of the target pole piece corresponds to the first target thickness one by one, and the target pole piece is a positive pole piece or a negative pole piece; a second acquisition unit, used to acquire the thickness of a plurality of target diaphragms, and obtain a plurality of second target thicknesses, wherein the target diaphragm is a first diaphragm or a second diaphragm, the first diaphragm is a diaphragm wound on the innermost circle negative pole piece, and the second diaphragm is any one a separator between the adjacent positive electrode sheets and the adjacent negative electrode sheets; a calculation unit, used to calculate the distance between two adjacent target electrode tabs based on at least the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out from the target electrode sheet, the target electrode tab is a positive electrode tab or a negative electrode tab, the polarity of the two adjacent target electrode tabs is the same, and the first target thickness, the second target thickness and the target distance correspond one to one; a control unit, used to control the cutting and winding of the plurality of target electrode sheets according to the target distance to obtain a target battery cell.

[0014] By applying the technical solution of the present application, a control method for producing a battery cell is provided. First, according to the thickness of multiple target electrode sheets, multiple first target thicknesses are determined, and the target electrode sheet is a positive electrode sheet or a negative electrode sheet. Then, the thickness of multiple target diaphragms is obtained to obtain multiple second target thicknesses, and the target diaphragm is a first diaphragm or a second diaphragm, the first diaphragm is a diaphragm wound on the innermost circle negative electrode sheet, and the second diaphragm is a diaphragm between any adjacent positive electrode sheet and negative electrode sheet. Then, according to at least the first target thickness and the second target thickness, the spacing between two adjacent target electrode ears is calculated to obtain the target spacing, the polarity of the two adjacent target electrode ears is the same, and the first target thickness, the second target thickness and the target spacing correspond one to one. Finally, according to the target spacing, the multiple target electrode sheets are controlled to be cut and wound to obtain the target battery cell. This solution calculates the corrected tab spacing based on the diaphragm wound around the innermost circle of negative electrode sheets, the thickness of other diaphragms, the thickness of the positive electrode sheets, and the thickness of the negative electrode sheets; and then performs subsequent cutting and winding processing based on the tab spacing, replacing the traditional method of first winding and then determining whether there is a misalignment. This method can produce qualified battery cells with alignment that meets the requirements in one go, thereby improving the battery cell production yield and solving the technical problem of how to improve the battery cell yield in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A schematic diagram showing a process flow of a battery cell manufacturing process in the prior art is shown;

[0017] Figure 2 A schematic diagram showing a production process of a monomer winding machine in the prior art is shown;

[0018] Figure 3 A schematic diagram showing the production process of a laser die-cutting and winding machine in the prior art;

[0019] Figure 4 A hardware structure block diagram of a mobile terminal for executing a control method for battery cell manufacturing provided in an embodiment of the present application is shown;

[0020] Figure 5 A schematic flow chart of a control method for manufacturing a battery cell according to an embodiment of the present application is shown;

[0021] Figure 6 A specific flow chart of a control method for manufacturing a battery cell provided in accordance with an embodiment of the present application is shown;

[0022] Figure 7A specific flow chart of another control method for manufacturing a battery cell provided in an embodiment of the present application is shown;

[0023] Figure 8 A structural block diagram of a control device for manufacturing a battery cell provided in accordance with an embodiment of the present application is shown.

[0024] The above drawings include the following reference numerals:

[0025] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] In the prior art, the production process of the battery cell is as follows: Figure 1 As shown, the positive electrode sheet and the negative electrode sheet are coated respectively, and after coating, they are rolled; after rolling, the thickness of the positive electrode sheet and the negative electrode sheet is measured by an online thickness tester; according to the thickness of the whole roll of positive and negative electrodes after rebound, the positive electrode roll and the negative electrode roll are die-cut according to a certain tab spacing; the die-cut positive electrode sheet and negative electrode sheet are transported to the winding process, and at the winding station, the three main materials, namely the positive electrode, the negative electrode and the isolation film, are wound into a battery cell.

[0030] In practical applications, winding equipment is mainly divided into single winding machine and laser die-cutting winding machine. The production process of single winding machine is as follows: Figure 2 As shown, the positive and negative electrode sheets after rolling are run to the die-cutting process. The die-cutting process performs die-cutting according to the same pole ear spacing, and the pole rolls after die-cutting are transferred to the winding process for winding. However, the following problems exist in the above production process: First, when the thickness of the pole rolls after rolling fluctuates violently, the alignment of the pole ears of the wound production battery cells exceeds the specification, causing the entire roll of pole sheets to be scrapped; secondly, there is a lag in manual or equipment detection of poor alignment of the battery cell pole ears, and the defective battery cells that have been produced will be scrapped, increasing costs; in addition, manual or equipment adjustments may not be in place at one time, which will also result in the production of defective battery cells. The production process of the laser die-cutting and winding machine is as follows: Figure 3 As shown, the positive and negative electrode sheets after rolling are directly transferred to the laser die-cutting and winding process, and are wound after laser die-cutting. However, there are the following problems in the above production process: First, the laser die-cutting integrated machine is larger than the single winding machine, and the equipment stores more electrode sheets. After the winding is completed, if the alignment of the pole tabs is poor, more battery cells with poor alignment of the pole tabs will be produced; secondly, if the manual or equipment adjustments are not in place at one time, it will also cause the production of bad battery cells.

[0031] As introduced in the background technology, in the prior art, the alignment of the tabs is poor, resulting in a low yield rate of the battery cell. To solve the above problem, the embodiments of the present application provide a control method and a control device for battery cell production.

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 4 FIG. 1 is a hardware structure block diagram of a mobile terminal of a control method for producing a battery cell according to an embodiment of the present invention. Figure 4 As shown, the mobile terminal may include one or more ( Figure 4 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 4 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 4 More or fewer components as shown, or with Figure 4 Different configurations shown.

[0034] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the control method of the battery cell production in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned specific examples of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] In this embodiment, a control method for producing a battery cell running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Figure 5 1 is a flow chart of a control method for manufacturing a battery cell according to an embodiment of the present application. Figure 5 As shown, the method comprises the following steps:

[0037] Step S201, obtaining the thicknesses of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets;

[0038] Specifically, the thickness of the target pole piece after rolling can be measured by a mechanical measurement method or a non-contact measurement method, for example: the thickness of the target pole piece is detected in real time by an online thickness tester. Since the amount of data collected by the online thickness tester is large, the average value of multiple test data can be taken to reduce the requirements for equipment configuration and improve calculation efficiency. After rolling, the thickness of the pole piece will rebound to a certain extent, and the rebound amount of the thickness is related to the materials used and the ratio. That is to say, the thickness of the target pole piece is the thickness of the target pole piece before the rebound measured by the online thickness tester, and the first target thickness is the thickness of the target pole piece after the rebound.

[0039] Step S202, obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0040] Specifically, the diaphragm is used to separate the positive electrode plate and the negative electrode plate to prevent them from direct contact, thereby avoiding the occurrence of short circuit. Although the diaphragm separates the positive and negative electrode plates, it also allows ions to pass freely between the positive and negative electrodes. In addition, the diaphragm has thermal stability, chemical stability and a certain mechanical strength. It is precisely because of the above-mentioned material properties of the diaphragm that the diaphragm is difficult to deform. Therefore, the above-mentioned second target thickness can be directly obtained by obtaining the thickness of the target diaphragm. The diaphragm material can be polyethylene, polypropylene, polyamide, polyimide, etc.

[0041] Step S203, calculating the distance between two adjacent target electrode tabs at least according to the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out of the target electrode piece, the target electrode tab is a positive electrode tab or a negative electrode tab, the two adjacent target electrode tabs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0042] Specifically, the target spacing is the spacing between two adjacent positive electrode tabs or the spacing between two adjacent negative electrode tabs.

[0043] Step S204, according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain target battery cells.

[0044] Specifically, in the cutting process, i.e., the laser die-cutting process, die-cutting can be performed according to the above-mentioned target spacing. In the winding process of the battery cell, because the above-mentioned target spacing used is die-cut according to the thickness of the positive electrode sheet and the thickness of the negative electrode sheet, the adverse effect of the thickness fluctuation of the positive electrode sheet or the negative electrode sheet on the alignment of the tabs can be avoided. In addition, the above-mentioned die-cutting, winding, cold pressing, etc. are all conventional technical means in this field, and the present invention will not be specifically repeated or limited here.

[0045] Through this embodiment, a control method for battery cell production is provided, first, according to the thickness of multiple target electrode sheets, multiple first target thicknesses are determined, and the target electrode sheet is a positive electrode sheet or a negative electrode sheet; then, the thickness of multiple target separators is obtained to obtain multiple second target thicknesses, and the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet; then, according to at least the first target thickness and the second target thickness, the spacing between two adjacent target electrode ears is calculated to obtain the target spacing, the polarity of the two adjacent target electrode ears is the same, and the first target thickness, the second target thickness and the target spacing correspond one to one; finally, according to the target spacing, the multiple target electrode sheets are controlled to be cut and wound to obtain the target battery cell. This solution calculates the corrected tab spacing based on the diaphragm wound around the innermost circle of negative electrode sheets, the thickness of other diaphragms, the thickness of the positive electrode sheets, and the thickness of the negative electrode sheets; and then performs subsequent cutting and winding processing based on the tab spacing, replacing the traditional method of first winding and then determining whether there is a misalignment. This method can produce qualified battery cells with alignment that meets the requirements in one go, thereby improving the battery cell production yield and solving the technical problem of how to improve the battery cell yield in the prior art.

[0046] In the specific implementation process, the above step S201 can be implemented by the following steps: step S2011, rolling a plurality of first prepared pole pieces to obtain a plurality of processed pole pieces, and obtaining the thickness of the plurality of processed pole pieces to obtain a plurality of first prepared thicknesses; step S2012, determining whether the plurality of processed pole pieces stop deforming, and obtaining the thickness of the processed pole pieces when the plurality of processed pole pieces stop deforming, to obtain a plurality of second prepared thicknesses; step S2013, calculating the ratio of the average value of the plurality of first prepared thicknesses to the average value of the plurality of second prepared thicknesses to obtain a thickness correction coefficient; step S2014, using the thickness correction coefficient to correct the thickness of each of the target pole pieces to obtain a plurality of first target thicknesses. This method obtains the thickness correction coefficient by calculating the ratio of the pole piece thickness after rebound to the pole piece thickness before rebound, and uses the thickness correction coefficient to correct the thickness of each of the target pole pieces, thereby further improving the calculation accuracy of the first target thickness.

[0047] Specifically, the first prepared thickness is the thickness of the positive electrode sheet or the thickness of the negative electrode sheet before rebound, and the second prepared thickness is the thickness at which the sheet stops deforming, that is, the thickness of the positive electrode sheet or the thickness of the negative electrode sheet after rebound. To prevent the occurrence of extreme values, the average values ​​of multiple first prepared thicknesses and multiple second prepared thicknesses are taken respectively, and an accurate thickness correction coefficient can be further calculated.

[0048] In order to further calculate the precise first target thickness value, the above step S2014 of the present application can be implemented by the following steps: Step S20141, at least based on the product of the thickness of the above target pole piece and the above thickness correction coefficient, calculate multiple above first target thicknesses.

[0049] In practical applications, the formula can be used: or , calculate the first target thickness ,in, is the thickness correction factor mentioned above, is the thickness of the target electrode, is the coefficient of difference, and the size of the coefficient of difference is related to the material of the target electrode and the ratio between the materials.

[0050] The above step S203 can also be implemented in other ways, for example: step S2031, obtaining the gap coefficient and the winding needle circumference, wherein the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the winding needle circumference is used to characterize the circumference of the winding needle of the winding machine that winds the above target battery cell; step S2032, calculating the above target spacing according to the above first target thickness, the above second target thickness, the above gap coefficient and the above winding needle circumference. In the process of calculating the above target spacing, the gap coefficient and the winding needle circumference are added on the basis of the first target thickness and the second target thickness. This method can further accurately calculate the above target spacing.

[0051] Specifically, the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the width is related to the tension of the pole piece, the material of the pole piece and other characteristics.

[0052] In some embodiments, the above step S2031 can be specifically implemented by the following steps: step S20311, obtaining the spacing between any two adjacent second prepared pole pieces among the plurality of second prepared pole pieces, and obtaining a plurality of prepared spacings, wherein the alignment of the pole ears on each of the second prepared pole pieces is less than the alignment threshold; step S20312, calculating the average value of the plurality of prepared spacings, and obtaining the above gap coefficient. The above gap coefficient is obtained by calculating the average value of the spacing between the pole pieces corresponding to the pole ears that meet the alignment threshold, and the method can further accurately calculate the above gap coefficient.

[0053] In practical applications, the above-mentioned gap coefficient can be obtained by selecting pole pieces with good tab alignment in advance, removing pole pieces with poor tab alignment, and calculating the distance between any two adjacent pole pieces.

[0054] In some embodiments, step S2032 can be implemented by the following steps: Step S20321, according to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second diaphragm, respectively calculate the distance between the two adjacent positive electrode tabs and the distance between the two adjacent negative electrode tabs to obtain the target distance. According to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second diaphragm, the target distance is calculated, and the method can further accurately calculate the distance between the two adjacent positive electrode tabs and the distance between the two adjacent negative electrode tabs.

[0055] Specifically, in the process of calculating the spacing between the two adjacent positive electrode tabs and the spacing between the two adjacent negative electrode tabs, the six parameters of the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm are used for calculation, which can further simplify the calculation process of the above target spacing.

[0056] In the specific implementation process, step S20321 can be implemented by the following steps: Step S203211, according to the formula , calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab ,in, is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second separator. By providing the above calculation formula, the method can further accurately calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab.

[0057] Specifically, the distance between the first positive electrode tab and the second positive electrode tab is The calculation formula is as follows: , the distance between the second positive electrode tab and the third positive electrode tab The calculation formula is as follows: , and so on.

[0058] In some other implementations, step S20321 can be implemented by the following steps: Step S203212, according to the formula , calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab ,in, is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second separator. By providing the above calculation formula, the method can further accurately calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab.

[0059] Specifically, the distance between the first negative electrode tab and the second negative electrode tab is The calculation formula is as follows: , the distance between the second negative electrode tab and the third negative electrode tab The calculation formula is as follows: According to the calculation formula for the target spacing between adjacent positive electrode tabs and the calculation formula for the target spacing between adjacent negative electrode tabs, in fact, the parameters used in the two formulas in the calculation process are: the circumference of the winding needle , the above gap coefficient , the second target thickness of the first diaphragm , the first target thickness of the negative electrode sheet , the first target thickness of the positive electrode sheet and the second target thickness of the second diaphragm The difference between the two formulas is only the first target thickness of the negative electrode sheet. , the first target thickness of the positive electrode sheet and the second target thickness of the second diaphragm The coefficient value of .

[0060] The above step S204 can also be implemented in other ways, for example: step S2041, according to the above target spacing, control the cutting control process of the plurality of the above target pole pieces to obtain a plurality of cut pole pieces, wherein any one of the above cut pole pieces includes the above target pole ear; step S2042, control the winding process of the plurality of the above cut pole pieces and the plurality of the above target separators to obtain the above target battery cell. Since the above target spacing is die-cut according to the thickness matching of the positive pole piece and the negative pole piece, and die-cutting is performed according to the target spacing, this method can further avoid the adverse effects of the thickness fluctuation of the positive pole piece or the negative pole piece on the alignment of the pole ear, and further improve the battery cell manufacturing yield.

[0061] In practical applications, the above winding step also includes a cold pressing process. In addition, the above die cutting, winding and cold pressing are all conventional technical means in this field, and the present invention will not be specifically described or limited here.

[0062] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method for manufacturing a battery cell of the present application will be described in detail below in conjunction with specific embodiments.

[0063] Example 1

[0064] This embodiment relates to a specific control method for producing a battery cell. Figure 6 As shown, the following steps are included:

[0065] Step S11: performing a rolling process on the electrode piece;

[0066] Step S12: Detecting the thickness of the pole piece to obtain the thickness distribution of the pole piece;

[0067] Step S13: correcting the thickness of the pole piece using the pole piece thickness rebound coefficient to obtain a corrected pole piece thickness;

[0068] Step S14: outputting the corrected pole piece thickness corresponding to each pole piece, and obtaining the thickness characteristic value corresponding to the pole piece ID;

[0069] Step S15: Calculate the spacing between adjacent tabs according to the tab spacing model, where the spacing between the nth negative tab and the n+1th negative tab is The tab spacing model is: , the distance between the nth positive electrode tab and the n+1th positive electrode tab The tab spacing model is: , is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is a second target thickness of the second diaphragm;

[0070] Step S16: performing a die-cutting process on the pole piece according to the calculated pole tab spacing;

[0071] Step S17: performing a winding process on the die-cut electrode piece and the diaphragm.

[0072] Example 2

[0073] This embodiment relates to another specific control method for producing a battery cell. Figure 7 As shown, the following steps are included:

[0074] Step S21: performing a rolling process on the positive electrode sheet and the negative electrode sheet respectively;

[0075] Step S22: detecting the thickness of the positive electrode sheet to obtain the thickness distribution of the positive electrode sheet, and detecting the thickness of the negative electrode sheet to obtain the thickness distribution of the negative electrode sheet;

[0076] Step S23: correcting the thickness of the positive electrode sheet by using the electrode sheet thickness rebound coefficient to obtain the corrected thickness of the positive electrode sheet, and correcting the thickness of the negative electrode sheet by using the electrode sheet thickness rebound coefficient to obtain the corrected thickness of the negative electrode sheet;

[0077] Step S24: outputting the corrected electrode sheet thickness corresponding to each positive electrode sheet to obtain the thickness characteristic value corresponding to the positive electrode sheet ID, and outputting the corrected electrode sheet thickness corresponding to each negative electrode sheet to obtain the thickness characteristic value corresponding to the negative electrode sheet ID;

[0078] Step S25: According to the negative electrode tab spacing model: , calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab , according to the positive electrode tab spacing model: , calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab , is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is a second target thickness of the second diaphragm;

[0079] Step S26: performing a die-cutting process on the positive electrode sheet according to the calculated positive electrode tab spacing, and performing a die-cutting process on the negative electrode sheet according to the calculated negative electrode tab spacing;

[0080] Step S27: performing a winding process on the die-cut positive electrode sheet, negative electrode sheet and separator.

[0081] The embodiments of the present application also provide a control device for the production of battery cells. It should be noted that the control device for the production of battery cells in the embodiments of the present application can be used to execute the control method for the production of battery cells provided in the embodiments of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0082] The following is an introduction to the control device for producing a battery cell provided in an embodiment of the present application.

[0083] Figure 8 Schematic diagram of a control device made of a battery cell according to an embodiment of the present application. Figure 8 As shown, the device comprises:

[0084] A first acquisition unit 10 is used to acquire the thickness of multiple target electrode pieces, and determine multiple first target thicknesses according to the thicknesses of the multiple target electrode pieces, wherein the thicknesses of the target electrode pieces correspond to the first target thicknesses one by one, and the target electrode pieces are positive electrode pieces or negative electrode pieces;

[0085] Specifically, the thickness of the target pole piece after rolling can be measured by a mechanical measurement method or a non-contact measurement method, for example: the thickness of the target pole piece is detected in real time by an online thickness tester. Since the amount of data collected by the online thickness tester is large, the average value of multiple test data can be taken to reduce the requirements for equipment configuration and improve calculation efficiency. After rolling, the thickness of the pole piece will rebound to a certain extent, and the rebound amount of the thickness is related to the materials used and the ratio. That is to say, the thickness of the target pole piece is the thickness of the target pole piece before the rebound measured by the online thickness tester, and the first target thickness is the thickness of the target pole piece after the rebound.

[0086] A second acquisition unit 20 is used to acquire the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0087] Specifically, the diaphragm is used to separate the positive electrode plate and the negative electrode plate to prevent them from direct contact, thereby avoiding the occurrence of short circuit. Although the diaphragm separates the positive and negative electrode plates, it also allows ions to pass freely between the positive and negative electrodes. In addition, the diaphragm has thermal stability, chemical stability and a certain mechanical strength. It is precisely because of the above-mentioned material properties of the diaphragm that the diaphragm is difficult to deform. Therefore, the above-mentioned second target thickness can be directly obtained by obtaining the thickness of the target diaphragm. The diaphragm material can be polyethylene, polypropylene, polyamide, polyimide, etc.

[0088] A calculation unit 30 is used to calculate the distance between two adjacent target pole ears according to at least the first target thickness and the second target thickness to obtain a target distance, wherein the target pole ear is a conductor led out of the target pole piece, the target pole ear is a positive pole ear or a negative pole ear, the two adjacent target pole ears have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0089] Specifically, the target spacing is the spacing between two adjacent positive electrode tabs or the spacing between two adjacent negative electrode tabs.

[0090] The control unit 40 is used to control the cutting and winding of the plurality of target pole pieces to obtain target battery cells according to the target spacing.

[0091] Specifically, in the cutting process, i.e., the laser die-cutting process, die-cutting can be performed according to the above-mentioned target spacing. In the winding process of the battery cell, because the above-mentioned target spacing used is die-cut according to the thickness of the positive electrode sheet and the thickness of the negative electrode sheet, the adverse effect of the thickness fluctuation of the positive electrode sheet or the negative electrode sheet on the alignment of the tabs can be avoided. In addition, the above-mentioned die-cutting, winding, cold pressing, etc. are all conventional technical means in this field, and the present invention will not be specifically repeated or limited here.

[0092] Through this embodiment, a control device for producing a battery cell is provided, wherein a first acquisition unit determines a plurality of first target thicknesses according to the thicknesses of a plurality of target electrode sheets, wherein the target electrode sheet is a positive electrode sheet or a negative electrode sheet; a second acquisition unit acquires the thicknesses of a plurality of target diaphragms to obtain a plurality of second target thicknesses, wherein the target diaphragm is a first diaphragm or a second diaphragm, wherein the first diaphragm is a diaphragm wound on the innermost circle negative electrode sheet, and the second diaphragm is a diaphragm between any adjacent positive electrode sheet and negative electrode sheet; a calculation unit is used to calculate the spacing between two adjacent target electrode ears according to at least the first target thickness and the second target thickness to obtain a target spacing, wherein the polarities of the two adjacent target electrode ears are the same, and the first target thickness, the second target thickness and the target spacing correspond one to one; a control unit is used to control the cutting and winding of the plurality of target electrode sheets according to the target spacing to obtain a target battery cell. This solution calculates the corrected tab spacing based on the diaphragm wound around the innermost circle of negative electrode sheets, the thickness of other diaphragms, the thickness of the positive electrode sheets, and the thickness of the negative electrode sheets; and then performs subsequent cutting and winding processing based on the tab spacing, replacing the traditional method of first winding and then determining whether there is a misalignment. This method can produce qualified battery cells with alignment that meets the requirements in one go, thereby improving the battery cell production yield and solving the technical problem of how to improve the battery cell yield in the prior art.

[0093] In the specific implementation process, the first acquisition unit includes a processing module, a determination module, a first calculation module and a correction module, wherein the processing module is used to perform a rolling process on a plurality of first preparation pole pieces to obtain a plurality of processed pole pieces, and obtain the thickness of the plurality of processed pole pieces to obtain a plurality of first preparation thicknesses; the determination module is used to determine whether the plurality of processed pole pieces stop deforming, and when the plurality of processed pole pieces stop deforming, obtain the thickness of the processed pole pieces to obtain a plurality of second preparation thicknesses; the first calculation module is used to calculate the ratio of the average value of the plurality of first preparation thicknesses to the average value of the plurality of second preparation thicknesses to obtain a thickness correction coefficient; the correction module is used to use the thickness correction coefficient to correct the thickness of each of the target pole pieces to obtain a plurality of first target thicknesses. The device obtains the thickness correction coefficient by calculating the ratio of the pole piece thickness after rebound to the pole piece thickness before rebound, and uses the thickness correction coefficient to correct the thickness of each of the target pole pieces, thereby further improving the calculation accuracy of the first target thickness.

[0094] Specifically, the first prepared thickness is the thickness of the positive electrode sheet or the thickness of the negative electrode sheet before rebound, and the second prepared thickness is the thickness at which the sheet stops deforming, that is, the thickness of the positive electrode sheet or the thickness of the negative electrode sheet after rebound. To prevent the occurrence of extreme values, the average values ​​of multiple first prepared thicknesses and multiple second prepared thicknesses are taken respectively, and an accurate thickness correction coefficient can be further calculated.

[0095] In order to further calculate and obtain an accurate first target thickness value, the correction module of the present application is also used to calculate and obtain multiple first target thicknesses based on at least the product of the thickness of the target pole piece and the thickness correction coefficient.

[0096] In practical applications, the formula can be used: or , calculate the first target thickness ,in, is the thickness correction factor mentioned above, is the thickness of the target electrode, is the coefficient of difference, and the size of the coefficient of difference is related to the material of the target electrode and the ratio between the materials.

[0097] The calculation unit includes an acquisition module and a calculation module, wherein the acquisition module is used to acquire the gap coefficient and the winding needle circumference, wherein the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the winding needle circumference is used to characterize the circumference of the winding needle of the winding machine that winds the target battery cell; the calculation module is used to calculate the target spacing according to the first target thickness, the second target thickness, the gap coefficient and the winding needle circumference. In the process of calculating the target spacing, the gap coefficient and the winding needle circumference are added on the basis of the first target thickness and the second target thickness, and the device can further accurately calculate the target spacing.

[0098] Specifically, the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the width is related to the tension of the pole piece, the material of the pole piece and other characteristics.

[0099] In some embodiments, the acquisition module includes an acquisition submodule and a first calculation submodule, wherein the acquisition submodule is used to acquire the spacing between any two adjacent second preparation pole pieces among the plurality of second preparation pole pieces, and obtain a plurality of preparation spacings, wherein the alignment of the pole ears on each of the second preparation pole pieces is less than the alignment threshold; the first calculation submodule is used to calculate the average value of the plurality of preparation spacings to obtain the gap coefficient. By calculating the average value of the spacing between the pole pieces corresponding to the pole ears that meet the alignment threshold, the gap coefficient is obtained, and the device can further accurately calculate the gap coefficient.

[0100] In practical applications, the above-mentioned gap coefficient can be obtained by selecting pole pieces with good tab alignment in advance, removing pole pieces with poor tab alignment, and calculating the distance between any two adjacent pole pieces.

[0101] In some embodiments, the calculation module includes a second calculation submodule, which is used to calculate the distance between the two adjacent positive electrode tabs and the distance between the two adjacent negative electrode tabs according to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second diaphragm, respectively, to obtain the target distance. By calculating the target distance according to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second diaphragm, the device can further accurately calculate the distance between the two adjacent positive electrode tabs and the distance between the two adjacent negative electrode tabs.

[0102] Specifically, in the process of calculating the spacing between the two adjacent positive electrode tabs and the spacing between the two adjacent negative electrode tabs, the six parameters of the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm are used for calculation, which can further simplify the calculation process of the above target spacing.

[0103] In the specific implementation process, the second calculation submodule is also used to calculate the , calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab ,in, is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second separator. By providing the above calculation formula, the device can further accurately calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab.

[0104] Specifically, the distance between the first positive electrode tab and the second positive electrode tab is The calculation formula is as follows: , the distance between the second positive electrode tab and the third positive electrode tab The calculation formula is as follows: , and so on.

[0105] In some other implementations, the second calculation submodule is further configured to calculate , calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab ,in, is the circumference of the winding needle, is the above gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second separator. By providing the above calculation formula, the device can further accurately calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab.

[0106] Specifically, the distance between the first negative electrode tab and the second negative electrode tab is The calculation formula is as follows: , the distance between the second negative electrode tab and the third negative electrode tab The calculation formula is as follows: According to the calculation formula for the target spacing between adjacent positive electrode tabs and the calculation formula for the target spacing between adjacent negative electrode tabs, in fact, the parameters used in the two formulas in the calculation process are: the circumference of the winding needle , the above gap coefficient , the second target thickness of the first diaphragm , the first target thickness of the negative electrode sheet , the first target thickness of the positive electrode sheet and the second target thickness of the second diaphragm The difference between the two formulas is only the first target thickness of the negative electrode sheet. , the first target thickness of the positive electrode sheet and the second target thickness of the second diaphragm The coefficient value of .

[0107] The control unit includes a first control module and a second control module, wherein the first control module is used to control the cutting control processing of the plurality of target pole pieces according to the target spacing to obtain a plurality of cut pole pieces, wherein any one of the cut pole pieces includes the target pole ear; the second control module is used to control the winding processing of the plurality of cut pole pieces and the plurality of target separators to obtain the target battery cell. Since the target spacing is die-cut according to the thickness of the positive pole piece and the thickness of the negative pole piece, and die-cutting is performed according to the target spacing, the device can further avoid the adverse effects of the thickness fluctuation of the positive pole piece or the negative pole piece on the alignment of the pole ear, and further improve the production yield of the battery cell.

[0108] In practical applications, the above winding step also includes a cold pressing process. In addition, the above die cutting, winding and cold pressing are all conventional technical means in this field, and the present invention will not be specifically described or limited here.

[0109] The control device for manufacturing the battery cell includes a processor and a memory. The first acquisition unit, the second acquisition unit, the calculation unit, and the control unit are all stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0110] The processor contains a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the production of the battery cell can be controlled by adjusting the kernel parameters.

[0111] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0112] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, a device where the computer-readable storage medium is located is controlled to execute the control method for manufacturing a battery cell.

[0113] Specifically, the control method for producing a battery cell includes:

[0114] Step S201, obtaining the thicknesses of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets;

[0115] Step S202, obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0116] Step S203, calculating the distance between two adjacent target electrode tabs at least according to the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out of the target electrode piece, the target electrode tab is a positive electrode tab or a negative electrode tab, the two adjacent target electrode tabs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0117] Step S204, according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain target battery cells.

[0118] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the control method for manufacturing a battery cell is executed when the program is run.

[0119] Specifically, the control method for producing a battery cell includes:

[0120] Step S201, obtaining the thicknesses of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets;

[0121] Step S202, obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0122] Step S203, calculating the distance between two adjacent target electrode tabs at least according to the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out of the target electrode piece, the target electrode tab is a positive electrode tab or a negative electrode tab, the two adjacent target electrode tabs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0123] Step S204, according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain target battery cells.

[0124] An embodiment of the present invention provides a device, the device comprising a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0125] Step S201, obtaining the thicknesses of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets;

[0126] Step S202, obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0127] Step S203, calculating the distance between two adjacent target electrode tabs at least according to the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out of the target electrode piece, the target electrode tab is a positive electrode tab or a negative electrode tab, the two adjacent target electrode tabs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0128] Step S204, according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain target battery cells.

[0129] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0130] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0131] Step S201, obtaining the thicknesses of a plurality of target electrode sheets, and determining a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets;

[0132] Step S202, obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet;

[0133] Step S203, calculating the distance between two adjacent target electrode tabs at least according to the first target thickness and the second target thickness to obtain a target distance, wherein the target electrode tab is a conductor led out of the target electrode piece, the target electrode tab is a positive electrode tab or a negative electrode tab, the two adjacent target electrode tabs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one;

[0134] Step S204, according to the target spacing, controlling the plurality of target electrode sheets to be cut and wound to obtain target battery cells.

[0135] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0136] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0137] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0138] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0139] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0140] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0141] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0142] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0143] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0144] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0145] 1) The control method for producing a battery cell of the present application first determines multiple first target thicknesses based on the thicknesses of multiple target electrodes, where the target electrode is a positive electrode or a negative electrode; then obtains the thicknesses of multiple target separators to obtain multiple second target thicknesses, where the target separator is a first separator or a second separator, where the first separator is a separator wound on the innermost circle negative electrode, and the second separator is a separator between any adjacent positive electrode and negative electrode; then, based on at least the first target thickness and the second target thickness, calculates the spacing between two adjacent target electrode ears to obtain a target spacing, where the polarities of the two adjacent target electrode ears are the same, and the first target thickness, the second target thickness and the target spacing correspond one to one; finally, based on the target spacing, controls multiple target electrode sheets to be cut and wound to obtain a target battery cell. This solution calculates the corrected tab spacing based on the diaphragm wound around the innermost circle of negative electrode sheets, the thickness of other diaphragms, the thickness of the positive electrode sheets, and the thickness of the negative electrode sheets; and then performs subsequent cutting and winding processing based on the tab spacing, replacing the traditional method of first winding and then determining whether there is a misalignment. This method can produce qualified battery cells with alignment that meets the requirements in one go, thereby improving the battery cell production yield and solving the technical problem of how to improve the battery cell yield in the prior art.

[0146] 2) A control device for producing a battery cell of the present application, wherein a first acquisition unit determines multiple first target thicknesses based on the thicknesses of multiple target electrode sheets, where the target electrode sheet is a positive electrode sheet or a negative electrode sheet; a second acquisition unit acquires the thicknesses of multiple target diaphragms to obtain multiple second target thicknesses, where the target diaphragm is a first diaphragm or a second diaphragm, where the first diaphragm is a diaphragm wound on the innermost circle negative electrode sheet, and the second diaphragm is a diaphragm between any adjacent positive electrode sheet and negative electrode sheet; a calculation unit is used to calculate the spacing between two adjacent target electrode ears based on at least the first target thickness and the second target thickness to obtain a target spacing, where the polarities of the two adjacent target electrode ears are the same, and the first target thickness, the second target thickness and the target spacing correspond one to one; a control unit is used to control the cutting and winding of multiple target electrode sheets based on the target spacing to obtain a target battery cell. This solution calculates the corrected tab spacing based on the diaphragm wound around the innermost circle of negative electrode sheets, the thickness of other diaphragms, the thickness of the positive electrode sheets, and the thickness of the negative electrode sheets; and then performs subsequent cutting and winding processing based on the tab spacing, replacing the traditional method of first winding and then determining whether there is a misalignment. This method can produce qualified battery cells with alignment that meets the requirements in one go, thereby improving the battery cell production yield and solving the technical problem of how to improve the battery cell yield in the prior art.

[0147] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for producing a battery cell, characterized in that: include: Acquire the thicknesses of a plurality of target electrode sheets, and determine a plurality of first target thicknesses according to the thicknesses of the plurality of target electrode sheets, wherein the thicknesses of the target electrode sheets correspond one-to-one to the first target thicknesses, and the target electrode sheets are positive electrode sheets or negative electrode sheets; Obtaining the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet; At least according to the first target thickness and the second target thickness, the distance between two adjacent target pole ears is calculated to obtain a target distance, wherein the target pole ear is a conductor led out from the target pole piece, the target pole ear is a positive pole ear or a negative pole ear, the two adjacent target pole ears have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one; According to the target spacing, a plurality of target pole pieces are controlled to be cut and wound to obtain a target battery cell. Determining a plurality of first target thicknesses according to the plurality of target pole piece thicknesses includes: Rolling the plurality of first prepared electrode sheets to obtain a plurality of processed electrode sheets, and obtaining the thickness of the plurality of processed electrode sheets to obtain a plurality of first prepared thicknesses; Determine whether the plurality of processing electrode pieces stop deforming, and when the plurality of processing electrode pieces stop deforming, obtain the thickness of the processing electrode pieces to obtain a plurality of second preliminary thicknesses; Calculating a ratio of an average value of a plurality of the first prepared thicknesses to an average value of a plurality of the second prepared thicknesses to obtain a thickness correction coefficient; The thickness correction coefficient is used to correct the thickness of each target pole piece to obtain a plurality of the first target thicknesses. Calculating the distance between two adjacent target tabs at least according to the first target thickness and the second target thickness to obtain a target distance includes: Obtaining a gap coefficient and a winding needle circumference, wherein the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the winding needle circumference is used to characterize the circumference of a winding needle of a winding machine that winds the target battery cell; The target spacing is calculated according to the first target thickness, the second target thickness, the gap coefficient, and the winding needle circumference.

2. The method according to claim 1, characterized in that The thickness correction coefficient is used to correct the thickness of each target pole piece to obtain a plurality of the first target thicknesses, including: A plurality of the first target thicknesses are calculated based on at least the product of the thickness of the target pole piece and the thickness correction coefficient.

3. The method according to claim 1, characterized in that Get the clearance factor, including: Obtaining a spacing between any two adjacent second prepared pole pieces among a plurality of second prepared pole pieces to obtain a plurality of prepared spacings, wherein the alignment of the pole ears on each of the second prepared pole pieces is less than an alignment threshold; The gap coefficient is obtained by calculating an average value of a plurality of the preparation intervals.

4. The method according to claim 1, characterized in that: Calculating the target spacing according to the first target thickness, the second target thickness, the gap coefficient, and the winding needle circumference includes: According to the gap coefficient, the winding needle circumference, the second target thickness of the first diaphragm, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet and the second target thickness of the second diaphragm, the spacing between two adjacent positive electrode tabs and the spacing between two adjacent negative electrode tabs are calculated respectively to obtain the target spacing.

5. The method according to claim 4, characterized in that According to the gap coefficient, the winding needle circumference, the second target thickness of the first separator, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second separator, the distance between two adjacent positive electrode tabs is calculated to obtain the target distance, including: According to the formula , calculate the distance between the nth positive electrode tab and the n+1th positive electrode tab ,in, is the circumference of the winding needle, is the gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second diaphragm.

6. The method according to claim 4, characterized in that Calculating the distance between two adjacent negative electrode tabs according to the gap coefficient, the winding needle circumference, the second target thickness of the first separator, the first target thickness of the positive electrode sheet, the first target thickness of the negative electrode sheet, and the second target thickness of the second separator to obtain the target distance includes: According to the formula , calculate the distance between the nth negative electrode tab and the n+1th negative electrode tab ,in, is the circumference of the winding needle, is the gap coefficient, is the second target thickness of the first diaphragm, is the first target thickness of the negative electrode sheet, is the first target thickness of the positive electrode sheet, is the second target thickness of the second diaphragm.

7. The method according to claim 1, characterized in that According to the target spacing, a plurality of target pole pieces are controlled to be cut and wound to obtain a target battery cell, including: According to the target spacing, controlling the plurality of target pole pieces to perform cutting control processing to obtain a plurality of cut pole pieces, wherein any one of the cut pole pieces includes one target pole lug; The plurality of cut pole pieces and the plurality of target separators are controlled to be wound to obtain the target battery cell.

8. A control device for producing a battery cell, characterized in that: include: A first acquisition unit, used to acquire the thickness of a plurality of target electrode pieces, and determine a plurality of first target thicknesses according to the thickness of the plurality of target electrode pieces, wherein the thickness of the target electrode piece corresponds to the first target thickness one by one, and the target electrode piece is a positive electrode piece or a negative electrode piece; A second acquisition unit is used to acquire the thickness of multiple target separators to obtain multiple second target thicknesses, wherein the target separator is a first separator or a second separator, the first separator is a separator wound on the innermost circle negative electrode sheet, and the second separator is a separator between any adjacent positive electrode sheet and negative electrode sheet; a calculation unit, configured to calculate a distance between two adjacent target pole lugs at least according to the first target thickness and the second target thickness, to obtain a target distance, wherein the target pole lug is a conductor led out of the target pole piece, the target pole lug is a positive pole lug or a negative pole lug, the two adjacent target pole lugs have the same polarity, and the first target thickness, the second target thickness and the target distance correspond one to one; A control unit is used to control the plurality of target pole pieces to be cut and wound according to the target spacing to obtain a target battery cell, The first acquisition unit includes a processing module, a determination module, a first calculation module and a correction module, wherein the processing module is used to perform a rolling process on a plurality of first preparation pole pieces to obtain a plurality of processed pole pieces, and obtain the thickness of the plurality of processed pole pieces to obtain a plurality of first preparation thicknesses; the determination module is used to determine whether the plurality of processed pole pieces stop deforming, and when the plurality of processed pole pieces stop deforming, obtain the thickness of the processed pole pieces to obtain a plurality of second preparation thicknesses; the first calculation module is used to calculate the ratio of the average value of the plurality of first preparation thicknesses to the average value of the plurality of second preparation thicknesses to obtain a thickness correction coefficient; the correction module is used to use the thickness correction coefficient to correct the thickness of each of the target pole pieces to obtain a plurality of first target thicknesses, The calculation unit includes an acquisition module and a calculation module, wherein the acquisition module is used to obtain a gap coefficient and a winding needle circumference, wherein the gap coefficient is used to characterize the width of the gap between adjacent pole pieces, and the winding needle circumference is used to characterize the circumference of a winding needle of a winding machine that winds the target battery cell; the calculation module is used to calculate the target spacing based on the first target thickness, the second target thickness, the gap coefficient and the winding needle circumference.

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