CN114566716B - Lithium battery thickness online control method and system and readable storage medium - Google Patents
Lithium battery thickness online control method and system and readable storage medium Download PDFInfo
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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- G05D5/02—Control of dimensions of material of thickness, e.g. of rolled material
- G05D5/03—Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric means
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
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- H01M4/02—Electrodes composed of, or comprising, active material
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Abstract
The invention provides a lithium battery thickness online control method, a lithium battery thickness online control system and a readable storage medium, wherein the method comprises the following steps: coating the current collector, and outputting a first working material of the lithium battery pole piece; measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge; constructing a dynamic roll gap prediction model based on rolling equipment; based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale, the roll gap variation trend along the time scale is obtained through dynamic roll gap prediction model prediction; controlling a rolling device to roll the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece; and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece. The invention can realize intelligent online control of the working procedure related to the thickness of the lithium battery in the lithium battery manufacturing process.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery thickness online control method and system and a readable storage medium.
Background
In recent years, with the development of scientific technology, lithium batteries have become the mainstream in the battery field. Lithium batteries are composed mainly of an anode, a cathode, a separator and an electrolyte, and operate by virtue of Li + moving between the anode and the cathode. During charging, Li + is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
The manufacturing process of the lithium battery is complex and the working procedures are numerous. Wherein the core process comprises coating and rolling. The coating procedure is that active substances, binding agents, conductive agents and the like are mixed to prepare slurry, then the slurry is coated on the two sides of a copper or aluminum current collector, and after drying, solvents are removed to form a positive plate and a negative plate; the rolling procedure is to adopt a double-roller machine to roll and compact the coated positive and negative plates.
Generally, the thickness of a lithium battery has strict requirements, and once the lithium battery is subjected to travel deviation in any process of a lithium battery manufacturing process, for example, during a coating process, due to uneven coating, the phenomenon of inconsistent thickness of a coated pole piece is easily caused. If the rolled pole piece is thick, the rolled pole piece is difficult to place in a lithium battery shell with uniform specification after being wound, and the thickness of the lithium battery can be thickened if the rolled pole piece is forced into the shell.
Disclosure of Invention
In order to solve at least one technical problem, the invention provides a lithium battery thickness online control method, a lithium battery thickness online control system and a readable storage medium, which can realize intelligent online control of processes related to the thickness of a lithium battery in a lithium battery manufacturing process, effectively ensure that the thickness of the manufactured lithium battery meets the specification requirement of a finished product, and further improve the production yield of the lithium battery.
The invention provides a lithium battery thickness online control method in a first aspect, which comprises the following steps:
sending a current collector for the lithium battery pole piece into coating equipment for coating operation, and outputting a first work material of the lithium battery pole piece;
measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
the method comprises the steps of obtaining the thickness specification requirement of the lithium battery, and deducing the standard thickness of a lithium battery pole piece according to the thickness specification requirement of the lithium battery;
based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale, predicting the roll gap variation trend along the time scale through a dynamic roll gap prediction model;
controlling the rolling equipment to roll the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
In this scheme, through the thickness gauge on-line measurement lithium-ion battery pole piece first work material along the thickness variation trend of flow direction scale, specifically include:
presetting a plurality of thickness gauges which are arranged along a direction vertical to the flow direction, and respectively measuring the thickness of a first working material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges;
obtaining influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
In this scheme, after a plurality of thickness gauges are used to measure the thickness of the first work material of lithium-ion battery pole piece at different positions on a certain flow direction scale, the method further comprises:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is greater than a second preset threshold value, if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of each thickness gauge marked as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, and if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauge from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
In this scheme, based on lithium-ion battery pole piece's standard thickness to and the first work material of lithium-ion battery pole piece along the thickness trend of change of flow to the scale, and obtain the roll gap trend of change along the time scale through the prediction of dynamic roll gap prediction model, specifically include:
the method comprises the steps of obtaining material components of a first material of the lithium battery pole piece, and obtaining corresponding resilience characteristics based on the material components;
analyzing the corresponding relation between the compression thickness and the rebound thickness of the first work material of the lithium battery pole piece based on the corresponding rebound characteristics;
acquiring the initial thickness of the first working material of the lithium battery pole piece on the flow direction scale A from the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale;
subtracting the roll gap pre-adjusted corresponding to the time scale from the initial thickness of the flow scale A to obtain the compressed thickness of the flow scale A, and subtracting the roll gap pre-adjusted corresponding to the time scale from the standard thickness of the lithium battery pole piece to obtain the rebound thickness of the flow scale A;
substituting the compression thickness of the flow direction scale A and the rebound thickness of the flow direction scale A into the corresponding relation, and calculating to obtain a roll gap preset corresponding to the time scale;
and respectively calculating the roll gaps preset by the continuous time scales, and obtaining the roll gap variation trend along the time scales on the basis of the roll gaps preset by the continuous time scales.
In this scheme, based on roll gap trend, control roll-in equipment carries out roll-in operation to lithium-ion battery pole piece first work material, specifically includes:
analyzing a stretching curve of a roll shaft of the rolling equipment along with temperature change, and constructing a size change prediction model based on the stretching curve;
acquiring the current temperature of the roll shaft through a temperature sensor, inputting the current temperature into a size change prediction model, and outputting a change value of the roll shaft relative to an initial size, wherein the initial size is the size of the roll shaft at normal temperature;
and dynamically compensating the roll gap variation trend based on the variation value to obtain the compensated roll gap variation trend, so that the roll shaft rolls the first work material of the lithium battery pole piece according to the compensated roll gap variation trend.
In this aspect, after outputting the value of the change in the roller shaft with respect to the initial size, the method further includes:
recording real size change data of the roll shaft at various temperatures in a historical period;
outputting corresponding predicted size change data through a size change prediction model based on various temperatures in a historical period;
subtracting the actual size change data and the predicted size change data of various temperatures in the historical period to obtain size deviation values of various temperatures in the historical period;
constructing a size deviation prediction model, and training the size deviation prediction model based on various temperatures in a historical period and corresponding size deviation values to obtain an optimized size deviation prediction model;
inputting the current temperature into the optimized size deviation prediction model, and outputting the size deviation value of the current temperature;
and compensating the change value based on the size offset value of the current temperature to obtain a compensated change value.
The second aspect of the present invention further provides an online lithium battery thickness control system, which includes a memory and a processor, where the memory includes an online lithium battery thickness control method program, and when executed by the processor, the online lithium battery thickness control method program implements the following steps:
sending a current collector for the lithium battery pole piece into coating equipment for coating operation, and outputting a first work material of the lithium battery pole piece;
measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
obtaining the thickness specification requirement of the lithium battery, and deducing the standard thickness of the lithium battery pole piece according to the thickness specification requirement of the lithium battery;
based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale, the roll gap variation trend along the time scale is obtained through dynamic roll gap prediction model prediction;
controlling the rolling equipment to roll the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
In this scheme, through the thickness gauge on-line measurement lithium-ion battery pole piece first work material along the thickness variation trend of flow direction scale, specifically include:
presetting a plurality of thickness gauges arranged in a direction perpendicular to the flow direction, and measuring the thicknesses of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges respectively;
acquiring influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
In this scheme, after the thicknesses of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale are respectively measured by the multiple thickness gauges, when the program of the lithium battery thickness online control method is executed by the processor, the following steps are also realized:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is larger than a second preset threshold value or not, and if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of marking each thickness gauge as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, and if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauges from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
The third aspect of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a program of an online lithium battery thickness control method, and when the program of the online lithium battery thickness control method is executed by a processor, the steps of the online lithium battery thickness control method are implemented.
According to the lithium battery thickness online control method, the lithium battery thickness online control system and the readable storage medium, the intelligent online control of the working procedures related to the thickness of the lithium battery in the lithium battery manufacturing process can be realized, the manufactured thickness of the lithium battery is effectively ensured to meet the specification requirement of finished products, and the production yield of the lithium battery is further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of an online lithium battery thickness control method according to the present invention;
fig. 2 shows a block diagram of an online control system for lithium battery thickness according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 shows a flow chart of an online control method for lithium battery thickness according to the present invention.
As shown in fig. 1, a first aspect of the present invention provides an online control method for lithium battery thickness, including:
s102, feeding a current collector for the lithium battery pole piece into coating equipment to perform coating operation, and outputting a first work material of the lithium battery pole piece;
s104, measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
s106, providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
s108, obtaining the thickness specification requirement of the lithium battery, and pushing out the standard thickness of the lithium battery pole piece according to the thickness specification requirement of the lithium battery;
s110, predicting to obtain a roll gap variation trend along time scales through a dynamic roll gap prediction model based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scales;
s112, controlling the rolling equipment to roll the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and S114, manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
It can be understood that the first material of the lithium battery pole piece is formed by coating slurry on both sides of a copper or aluminum current collector, wherein the slurry is formed by uniformly mixing positive or negative electrode powder, a conductive agent and a bonding agent according to a certain proportion. After the drying treatment, if the slurry is rolled according to a fixed roll gap, the thickness of the rolled lithium battery pole piece usually exceeds the roll gap due to the influence of the rebound property of the slurry. According to the invention, the thickness of the lithium battery pole piece is monitored in real time in the coating and rolling processes, the intelligent online control of the process related to the thickness of the lithium battery in the lithium battery manufacturing process can be realized, the thickness of the manufactured lithium battery is effectively ensured to meet the specification requirement of a finished product, and the production yield of the lithium battery is further improved.
It should be noted that the current collector is one of indispensable components in the lithium battery, and it not only can carry active materials, but also can collect and output the current generated by the electrode active materials, which is beneficial to reducing the internal resistance of the lithium battery and improving the coulombic efficiency, the cycle stability and the rate capability of the battery. The current collector of the present invention is preferably a copper current collector or an aluminum current collector.
The rolling equipment provided by the invention adopts double roll shafts to perform rolling operation, a roll gap is formed between the double roll shafts, and the size of the roll gap is a main factor for determining the thickness of the rolled lithium battery pole piece. The thickness of the preset lithium battery and the thickness of the lithium battery pole piece are in a direct proportional relation, and after the thickness specification requirement of the lithium battery is obtained, the standard thickness of the lithium battery pole piece can be obtained according to the direct proportional relation. The flow direction scale marks the length of the lithium battery pole piece along the flow direction, the preset rolling speed is fixed, namely the first working material flow speed of the lithium battery pole piece is fixed, and the corresponding relation between the flow direction scale and the time scale can be determined according to the formula of the speed, the time and the length, namely each flow direction scale is provided with the corresponding time scale. After the thickness of the first working material of the lithium battery pole piece on each flow direction scale is obtained, each corresponding time scale and the predicted roll gap can be determined, and the adjustment is carried out on each corresponding time scale according to the predicted roll gap.
According to the specific embodiment of the invention, the lithium battery meeting the thickness specification requirement is manufactured by adopting the second working material of the lithium battery pole piece, and the method specifically comprises the following steps:
slicing the second working material of the lithium battery pole pieces to form a plurality of lithium battery pole pieces;
and winding each lithium battery pole piece, then performing shell treatment, and performing liquid injection and welding treatment to manufacture the lithium battery meeting the thickness specification requirement.
According to the embodiment of the invention, the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale is measured on line through a thickness gauge, and the method specifically comprises the following steps:
presetting a plurality of thickness gauges arranged in a direction perpendicular to the flow direction, and measuring the thicknesses of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges respectively;
acquiring influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
It should be noted that, due to the influence of the uneven coating, the thickness of the first work material of the lithium battery pole piece along the direction perpendicular to the flow direction may not be uniform, and therefore, if only the thickness of a single point is measured by one thickness gauge, all the positions cannot be covered. According to the invention, the plurality of thickness gauges are arranged in the direction perpendicular to the flow direction, and the thickness gauges measure the thicknesses of different positions respectively. The specific calculation method comprises the following steps: and accumulating the importance levels of all the positions, and dividing the importance levels of all the positions by the accumulated sum respectively to obtain the influence weight of all the positions. And finally, calculating the comprehensive thickness on the flow direction scale based on the thicknesses of different positions on the flow direction scale and the corresponding influence weights, and drawing a thickness change trend by combining a plurality of comprehensive thicknesses on the continuous flow direction scale.
It can be understood that the thickness is measured by a plurality of thickness gauges, and the influence weight is combined, so that more fitting comprehensive thickness can be obtained, and more accurate thickness variation trend can be obtained conveniently.
According to the embodiment of the invention, after the thickness of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale is measured by a plurality of thickness meters, the method further comprises the following steps:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is larger than a second preset threshold value or not, and if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of each thickness gauge marked as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, and if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauge from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
It can be understood that although the thickness variation trend can be accurately measured by a plurality of thickness gauges, once a certain thickness gauge is abnormal, the thickness variation trend may be inaccurate. In order to avoid the problems, the plurality of thickness gauges are compared pairwise and checked by self, so that invalid thickness gauges are found out, thickness data measured by the invalid thickness gauges are removed, and error interference of the invalid thickness data on calculation of the thickness variation trend is avoided.
According to the specific embodiment of the invention, after the invalid thickness gauge is removed from the plurality of thickness gauges, the method further comprises the following steps:
updating and calculating corresponding influence weights based on the importance levels of the rest positions;
and multiplying the thicknesses of the rest different positions by the updated corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale.
It can be understood that when an invalid thickness gauge is eliminated, the sum of the influence weights of the remaining positions is not 1 due to the lack of one or more positions, and the influence weights of the remaining positions are recalculated by adopting the importance levels of the remaining positions.
According to the specific embodiment of the invention, after the invalid thickness gauge is removed from the plurality of thickness gauges, the method further comprises the following steps:
and replacing the thickness data measured at the corresponding position by the invalid thickness gauge by using historical thickness data without updating the influence weight of each position.
According to the embodiment of the invention, based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale, the roll gap variation trend along the time scale is obtained through prediction of a dynamic roll gap prediction model, and the method specifically comprises the following steps:
the method comprises the steps of obtaining material components of a first material of the lithium battery pole piece, and obtaining corresponding resilience characteristics based on the material components;
analyzing the corresponding relation between the compression thickness and the rebound thickness of the first work material of the lithium battery pole piece based on the corresponding rebound characteristics;
acquiring the initial thickness of the first working material of the lithium battery pole piece on the flow direction scale A from the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale;
subtracting the roll gap pre-adjusted corresponding to the time scale from the initial thickness of the flow scale A to obtain the compressed thickness of the flow scale A, and subtracting the roll gap pre-adjusted corresponding to the time scale from the standard thickness of the lithium battery pole piece to obtain the rebound thickness of the flow scale A;
substituting the compression thickness of the flow direction scale A and the rebound thickness of the flow direction scale A into the corresponding relation, and calculating to obtain a roll gap preset corresponding to the time scale;
and respectively calculating the roll gaps with preset continuous time scales, and obtaining the roll gap variation trend along the time scales on the basis of the roll gaps with preset continuous time scales.
The method analyzes the corresponding relation between the compression thickness and the rebound thickness based on the material quality of the work material, and calculates the preset roll gap by combining the corresponding relation and the standard thickness. The roll gap pre-adjusted by each time scale is dynamically changed based on the thickness change trend of the first working material of the lithium battery pole piece, so that the thickness of the second working material of the rolled lithium battery pole piece can be always close to the standard thickness.
According to a specific embodiment of the present invention, after calculating the continuous time scale pre-adjusted roll gap, the method further comprises:
obtaining historical rolling data, wherein each piece of historical rolling data at least comprises the initial thickness of a first working material of a lithium battery pole piece before rolling, the standard thickness of the first working material after rolling and a real roll gap;
dividing the standard thickness after rolling by the initial thickness before rolling according to each historical rolling data, and calculating to obtain a first proportional value of each historical rolling data;
dividing the standard thickness of the first working material of the current lithium battery pole piece by the initial thickness, and calculating to obtain a second proportional value;
respectively subtracting the second proportional value from the first proportional value of each historical rolling data, and carrying out absolute value processing on the proportional difference values to obtain absolute values of a plurality of difference values;
screening out historical rolling data with the absolute value of the difference value smaller than a fourth preset threshold value, and merging the historical rolling data into a correction database;
based on the initial thickness before rolling and the standard thickness after rolling in each piece of historical rolling data in the correction database, predicting by adopting a dynamic roll gap prediction model to obtain a predicted roll gap of each piece of historical rolling data;
respectively subtracting the corresponding predicted roll gaps from the real roll gaps of the historical rolling data in the correction database, and performing cumulative calculation on the difference values of the roll gaps to obtain a total roll gap difference value;
dividing the total roll gap difference value by the total amount of the historical roll pressing data in the correction database to obtain a roll gap correction value;
and adding the roll gap with the preset continuous time scale to the roll gap correction value to obtain the roll gap with the preset continuous time scale after correction.
Because the model prediction is realized based on ideal working conditions, if the working conditions of the rolling equipment are not the ideal working conditions, errors exist in the roll gap variation trend obtained by adopting the model prediction. According to the method, the error correction value is calculated through historical rolling data, and the roll gap variation trend predicted by the model is corrected based on the correction value, so that the accuracy of the roll gap variation trend is improved.
According to the embodiment of the invention, based on the roll gap variation trend, the rolling equipment is controlled to roll the first work material of the lithium battery pole piece, and the method specifically comprises the following steps:
analyzing a stretching curve of a roll shaft of the rolling equipment along with temperature change, and constructing a size change prediction model based on the stretching curve;
acquiring the current temperature of the roll shaft through a temperature sensor, inputting the current temperature into a size change prediction model, and outputting a change value of the roll shaft relative to an initial size, wherein the initial size is the size of the roll shaft at normal temperature;
and dynamically compensating the roll gap variation trend based on the variation value to obtain the compensated roll gap variation trend, so that the roll shaft rolls the first work material of the lithium battery pole piece according to the compensated roll gap variation trend.
According to the specific embodiment of the invention, the roll gap is the gap between two roll shafts, and if the size of a single roll shaft is increased, the shaft diameter of the single roll shaft is also increased; and (4) pushing out the variable wheel base of the single roll shaft according to the size change value, and adding 2 times of variable wheel base to the current roll gap to obtain the compensated roll gap. It is understood that the change axis has a positive and negative characteristic, and specifically, the change axis is a positive value when the roll shaft is expanded, and the change axis is a negative value when the roll shaft is contracted.
According to the invention, the influence of temperature on the roll shaft is analyzed, the roll gap change value caused by the influence of temperature is calculated, and the roll gap change value is used as a compensation value for compensation, so that more accurate roll gap can be obtained, and the thickness consistency of the rolled lithium battery pole piece is further ensured.
According to an embodiment of the present invention, after outputting the change value of the roll shaft with respect to the initial size, the method further includes:
recording real size change data of the roll shaft at various temperatures in a historical period;
outputting corresponding predicted size change data through a size change prediction model based on various temperatures in a historical period;
subtracting the actual size change data and the predicted size change data of various temperatures in the historical period to obtain size deviation values of various temperatures in the historical period;
constructing a size deviation prediction model, and training the size deviation prediction model based on various temperatures in a historical period and corresponding size deviation values to obtain an optimized size deviation prediction model;
inputting the current temperature into the optimized size deviation prediction model, and outputting the size deviation value of the current temperature;
and compensating the change value based on the size offset value of the current temperature to obtain a compensated change value.
It can be understood that in the production process of a specific lithium battery, the traditional size detection sensor is replaced by the prediction model to detect the size change value of the roller shaft, so that the phenomenon of inaccurate detection caused by the fact that the size detection sensor is influenced by surrounding environmental factors for a long time can be avoided, and meanwhile, the cost is further saved.
In the rolling process, the temperature of the roll shaft rises to generate the size change phenomenon, and in order to compensate the roll gap change caused by the expansion or contraction of the roll shaft, the invention analyzes and calculates the corresponding size change value in real time according to the current temperature, thereby dynamically adjusting the roll shaft based on the size change value and further realizing the dynamic compensation of the roll gap.
Fig. 2 shows a block diagram of an online control system for lithium battery thickness according to the present invention.
As shown in fig. 2, the second aspect of the present invention further provides an online lithium battery thickness control system 2, which includes a memory 21 and a processor 22, where the memory includes an online lithium battery thickness control method program, and when executed by the processor, the online lithium battery thickness control method program implements the following steps:
sending a current collector for the lithium battery pole piece into coating equipment for coating operation, and outputting a first work material of the lithium battery pole piece;
measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
the method comprises the steps of obtaining the thickness specification requirement of the lithium battery, and deducing the standard thickness of a lithium battery pole piece according to the thickness specification requirement of the lithium battery;
based on the standard thickness of the lithium battery pole piece and the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale, predicting the roll gap variation trend along the time scale through a dynamic roll gap prediction model;
controlling the rolling equipment to perform rolling operation on the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
According to the embodiment of the invention, the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale is measured on line through a thickness gauge, and the method specifically comprises the following steps:
presetting a plurality of thickness gauges which are arranged along a direction vertical to the flow direction, and respectively measuring the thickness of a first working material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges;
obtaining influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
According to the embodiment of the invention, after the thicknesses of the first working material of the lithium battery pole piece at different positions on a certain flow direction scale are respectively measured by a plurality of thickness meters, the program of the lithium battery thickness online control method is executed by the processor to further realize the following steps:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is larger than a second preset threshold value or not, and if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of marking each thickness gauge as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, and if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauges from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
The third aspect of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a program of an online lithium battery thickness control method, and when the program of the online lithium battery thickness control method is executed by a processor, the steps of the online lithium battery thickness control method are implemented.
The lithium battery thickness online control method, the lithium battery thickness online control system and the readable storage medium can realize intelligent online control of the working procedure related to the lithium battery thickness in the lithium battery manufacturing process, effectively ensure that the manufactured lithium battery thickness meets the specification requirement of finished products, and further improve the production yield of the lithium battery.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or in other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps of implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer-readable storage medium, and when executed, executes the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media capable of storing program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An online control method for the thickness of a lithium battery is characterized by comprising the following steps:
sending a current collector for the lithium battery pole piece into coating equipment for coating operation, and outputting a first work material of the lithium battery pole piece;
measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
obtaining the thickness specification requirement of the lithium battery, and deducing the standard thickness of the lithium battery pole piece according to the thickness specification requirement of the lithium battery;
based on the standard thickness of lithium-ion battery pole piece to and the thickness trend of the first work material of lithium-ion battery pole piece along the flow direction scale, and obtain the roll gap trend along the time scale through the prediction of dynamic roll gap prediction model, specifically include:
the method comprises the steps of obtaining material components of a first material of the lithium battery pole piece, and obtaining corresponding resilience characteristics based on the material components;
analyzing the corresponding relation between the compression thickness and the rebound thickness of the first work material of the lithium battery pole piece based on the corresponding rebound characteristics;
acquiring the initial thickness of the first working material of the lithium battery pole piece on the flow direction scale A from the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale;
subtracting the roll gap pre-adjusted corresponding to the time scale from the initial thickness of the flow scale A to obtain the compressed thickness of the flow scale A, and subtracting the roll gap pre-adjusted corresponding to the time scale from the standard thickness of the lithium battery pole piece to obtain the rebound thickness of the flow scale A;
substituting the compression thickness of the flow direction scale A and the rebound thickness of the flow direction scale A into the corresponding relation, and calculating to obtain a roll gap preset corresponding to the time scale;
respectively calculating the roll gaps preset by the continuous time scales, and obtaining the roll gap variation trend along the time scales on the basis of the roll gaps preset by the continuous time scales;
controlling the rolling equipment to perform rolling operation on the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
2. The lithium battery thickness online control method according to claim 1, wherein the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale is measured online by a thickness gauge, and the method specifically comprises the following steps:
presetting a plurality of thickness gauges arranged in a direction perpendicular to the flow direction, and measuring the thicknesses of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges respectively;
acquiring influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
3. The lithium battery thickness online control method according to claim 2, wherein after the thickness of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale is measured by a plurality of thickness gauges, the method further comprises:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is greater than a second preset threshold value, if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of each thickness gauge marked as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauge from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
4. The lithium battery thickness online control method according to claim 1, wherein the rolling operation of the first work material of the lithium battery pole piece by the rolling device is controlled based on the roll gap variation trend, and specifically comprises the following steps:
analyzing a stretching curve of a roll shaft of the rolling equipment along with temperature change, and constructing a size change prediction model based on the stretching curve;
acquiring the current temperature of the roll shaft through a temperature sensor, inputting the current temperature into a size change prediction model, and outputting a change value of the roll shaft relative to an initial size, wherein the initial size is the size of the roll shaft at normal temperature;
and dynamically compensating the roll gap variation trend based on the variation value to obtain the compensated roll gap variation trend, so that the roll shaft rolls the first work material of the lithium battery pole piece according to the compensated roll gap variation trend.
5. The method of claim 4, wherein after outputting the change value of the roll shaft relative to the initial size, the method further comprises:
recording real size change data of the roll shaft at various temperatures in a historical period;
outputting corresponding predicted size change data through a size change prediction model based on various temperatures in a historical period;
subtracting the real size change data and the predicted size change data of various temperatures in the historical period to obtain size deviation values of various temperatures in the historical period;
constructing a size deviation prediction model, and training the size deviation prediction model based on various temperatures in a historical period and corresponding size deviation values to obtain an optimized size deviation prediction model;
inputting the current temperature into the optimized size deviation prediction model, and outputting the size deviation value of the current temperature;
and compensating the change value based on the size offset value of the current temperature to obtain a compensated change value.
6. An online lithium battery thickness control system is characterized by comprising a memory and a processor, wherein the memory comprises an online lithium battery thickness control method program, and the online lithium battery thickness control method program realizes the following steps when executed by the processor:
sending a current collector for the lithium battery pole piece into coating equipment for coating operation, and outputting a first work material of the lithium battery pole piece;
measuring the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale on line through a thickness gauge;
providing rolling equipment, and constructing a dynamic roll gap prediction model based on the rolling equipment;
obtaining the thickness specification requirement of the lithium battery, and deducing the standard thickness of the lithium battery pole piece according to the thickness specification requirement of the lithium battery;
based on the standard thickness of lithium-ion battery pole piece to and the thickness trend of the first work material of lithium-ion battery pole piece along the flow direction scale, and obtain the roll gap trend along the time scale through the prediction of dynamic roll gap prediction model, specifically include:
the method comprises the steps of obtaining material components of a first material of the lithium battery pole piece, and obtaining corresponding resilience characteristics based on the material components;
analyzing the corresponding relation between the compression thickness and the rebound thickness of the first work material of the lithium battery pole piece based on the corresponding rebound characteristics;
acquiring the initial thickness of the first working material of the lithium battery pole piece on the flow scale A from the thickness variation trend of the first working material of the lithium battery pole piece along the flow scale;
subtracting the roll gap pre-adjusted corresponding to the time scale from the initial thickness of the flow scale A to obtain the compressed thickness of the flow scale A, and subtracting the roll gap pre-adjusted corresponding to the time scale from the standard thickness of the lithium battery pole piece to obtain the rebound thickness of the flow scale A;
substituting the compression thickness of the flow direction scale A and the rebound thickness of the flow direction scale A into the corresponding relation, and calculating to obtain a roll gap preset corresponding to the time scale;
respectively calculating the roll gaps with preset continuous time scales, and obtaining the roll gap variation trend along the time scales on the basis of the roll gaps with preset continuous time scales;
controlling the rolling equipment to perform rolling operation on the first working material of the lithium battery pole piece based on the roll gap variation trend to obtain a second working material of the lithium battery pole piece;
and manufacturing the lithium battery meeting the thickness specification requirement by adopting the second working material of the lithium battery pole piece.
7. The online lithium battery thickness control system of claim 6, wherein the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale is measured online through a thickness gauge, and the online lithium battery thickness control system specifically comprises:
presetting a plurality of thickness gauges which are arranged along a direction vertical to the flow direction, and respectively measuring the thickness of a first working material of the lithium battery pole piece at different positions on a certain flow direction scale by the plurality of thickness gauges;
obtaining influence weights of different positions on the lithium battery pole piece, wherein the sum of the influence weights is equal to 1;
multiplying the thicknesses of different positions by corresponding influence weights respectively, and accumulating the products to obtain the comprehensive thickness of the first work material of the lithium battery pole piece on the flow direction scale;
and respectively calculating the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale, and obtaining the thickness variation trend of the first working material of the lithium battery pole piece along the flow direction scale based on the comprehensive thickness of the first working material of the lithium battery pole piece on the continuous flow direction scale.
8. The lithium battery thickness online control system according to claim 7, wherein after the thickness of the first work material of the lithium battery pole piece at different positions on a certain flow direction scale is measured by the plurality of thickness gauges, the lithium battery thickness online control method further realizes the following steps when the processor executes the program:
recording a plurality of first thickness data detected by a plurality of thickness gauges on a flow scale S;
subtracting the rest other first thickness data from each first thickness data to obtain a plurality of first difference values;
judging whether the absolute value of the first difference value is larger than a first preset threshold value or not, and if so, marking the first thickness data of the first difference value with an error once;
after each first thickness data is subjected to difference comparison with the rest first thickness data one by one, counting the total times of marking errors of each first thickness data;
judging whether the total number of times of marking errors of each first thickness data is greater than a second preset threshold value, if so, marking the thickness gauge corresponding to the first thickness data as misalignment once;
taking the flow direction scale S as an initial scale of a preset period, continuously analyzing a plurality of thickness data detected after the flow direction scale S in the preset period, and counting the accumulated times of marking each thickness gauge as misalignment;
judging whether the accumulated times of each thickness gauge marked as misalignment is greater than a third preset threshold, if so, judging the corresponding thickness gauge as an invalid thickness gauge;
and eliminating the invalid thickness gauges from the plurality of thickness gauges, and measuring the thickness variation trend of the first work material of the lithium battery pole piece along the flow direction scale on line through the residual thickness gauges.
9. A computer-readable storage medium, wherein the computer-readable storage medium includes a lithium battery thickness online control method program, and when the lithium battery thickness online control method program is executed by a processor, the steps of the lithium battery thickness online control method according to any one of claims 1 to 5 are implemented.
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