CN117352664B - Preparation method of double-layer coated battery core pole piece - Google Patents
Preparation method of double-layer coated battery core pole piece Download PDFInfo
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- CN117352664B CN117352664B CN202311639325.XA CN202311639325A CN117352664B CN 117352664 B CN117352664 B CN 117352664B CN 202311639325 A CN202311639325 A CN 202311639325A CN 117352664 B CN117352664 B CN 117352664B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 142
- 239000011248 coating agent Substances 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 239000011888 foil Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims description 49
- 230000007246 mechanism Effects 0.000 claims description 43
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002355 dual-layer Substances 0.000 claims 3
- 239000010410 layer Substances 0.000 claims 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 8
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000006258 conductive agent Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000011267 electrode slurry Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000006183 anode active material Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002134 carbon nanofiber Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a double-layer coated battery cell pole piece. Preparing a foil; coating for the first time; judging; when the analysis module judges that the one-time coating process of the battery cell pole piece does not meet the preset standard, judging the reason for not meeting the preset standard according to the number of cracks or the crack distribution so as to adjust the corresponding operation parameters to the corresponding values; the primary coating meets the preset standard, the secondary coating and judging whether the secondary coating meets the preset standard or not; and when the secondary coating is judged to meet the preset standard, judging that the double-layer coating is finished. Compared with the prior art, the method has the beneficial effects that by carrying out double-layer coating twice and carrying out surface detection in the middle of coating the battery cell pole piece, whether the operation parameters in the coating process meet the preset standard or not can be timely found, so that the operation parameters are timely corrected, and the coating yield of the battery cell pole piece is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a double-layer coated battery cell pole piece.
Background
With the vigorous development of new energy industry in China, the lithium ion battery has become the first choice of battery systems of electric automobiles and large-scale energy storage equipment due to the advantages of high energy density, long cycle life and the like. In recent years, with the continuous development of the application market of lithium batteries, the requirements of clients on the performance of lithium ion batteries are continuously improved, especially the requirements on the energy density of power battery cells are higher and higher, and under the same conditions, the high energy density can effectively increase the endurance mileage of vehicles, so that the energy density of batteries is improved, and the research and development of power type lithium ion batteries is the current focus, so that battery materials become the key for restricting the performance.
In the manufacturing process of the battery cell, if the anode active material slurry is directly coated on the photo-aluminum foil, the contact resistance between the active material and the aluminum foil is larger, the dynamic performance is poor and the cycle life is poor, in order to remedy the defect, the carbon-coated aluminum foil is generally adopted at present, namely, the surface of the aluminum foil is coated with the conductive carbon layer firstly and then the surface of the conductive carbon layer is coated with the anode active material slurry, so that the dynamic performance is improved but the energy density is sacrificed at the same time.
Chinese patent publication No.: CN110071292a discloses a preparation method of a positive pole piece of a lithium ion battery and the positive pole piece thereof, comprising: s1, dissolving an anode active material, a binder and a first conductive agent in the mass ratio of (96-97) (2-3) 1 in N-methylpyrrolidone, and uniformly mixing and stirring to obtain a first anode slurry; s2, dissolving the positive electrode active material, the binder and the second conductive agent (2-2.5) in the mass ratio of (96-96.5) to (1.5) in N-methylpyrrolidone, and uniformly mixing and stirring to obtain second positive electrode slurry; s3, uniformly coating the first positive electrode slurry obtained in the step S1 on two side surfaces of the photo-aluminum foil, wherein the coating weight of the first positive electrode slurry is 0.3-20 g/cm < 2 >, uniformly coating the second positive electrode slurry obtained in the step S2 on the outer side of the first positive electrode slurry after drying, and preparing a positive electrode plate of the lithium ion battery after drying; wherein the conductivity of the first conductive agent is greater than the conductivity of the second conductive agent; the first conductive agent is one or more of CNT, graphene and VGCF, and the second conductive agent is one or more of graphite, carbon black and acetylene black; the positive electrode active material in the step S1 is one or a mixture of two of lithium iron phosphate and lithium manganese iron phosphate; the binder in the step S1 is one or two of polyvinylidene fluoride and polytetrafluoroethylene. Therefore, the preparation method of the positive electrode plate of the lithium ion battery and the positive electrode plate thereof have the following problems: the coated battery cell pole piece cannot be detected in time and corresponding operation parameters cannot be adjusted according to detection results, and the yield of double-layer coating of the battery cell pole piece cannot be guaranteed, and the yield is low.
Disclosure of Invention
Therefore, the invention provides a preparation method of a double-layer coated battery cell pole piece, which is used for solving the problem of lower yield in the prior art.
In order to achieve the above purpose, the invention provides a preparation method of a double-layer coated electrode slice. Comprising the following steps:
step S1, a preparation module prepares a metal foil of an electrode slice according to preset parameters in the preparation module;
s2, the coating module finishes one-time coating of the electrode slice by using preset parameters in the coating module;
step S3, the analysis module controls the conveying mechanism to output the coated electrode slices to the drying module, and the drying module carries out drying treatment on the coated electrode slices;
s4, the analysis module controls the detection module to acquire the image information of the surface of the dried battery cell pole piece output by the drying module, and judges whether the coating process of the battery cell pole piece meets the preset standard according to the crack characteristics in the image information;
step S5, when the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, determining the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number or the distribution of cracks on the surface of the battery cell pole piece, and adjusting the corresponding operation parameters of the coating module, the conveying mechanism or the drying module to the corresponding values based on the determined reason;
Step S6, when the analysis module judges that the coating process of the battery cell pole piece meets the preset standard, controlling the coating module to carry out secondary coating on the battery cell pole piece and repeating the steps S3-S5 to judge whether the secondary coating meets the preset standard or not;
and S7, when the analysis module judges that the secondary coating meets the preset standard, the preparation of the battery cell pole piece is completed.
Further, in the step S4, the analysis module determines, according to the number of cracks on the surface of the electrode sheet, a determination mode of whether the process of coating the electrode sheet meets a preset standard, where:
the first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and judges the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number of cracks; the first judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is larger than the number of first-level preset cracks preset in the analysis module;
the second judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and determines the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the crack distribution condition; the second judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than or equal to the first-level preset number of cracks and larger than or equal to the second-level preset number of cracks preset in the analysis module;
The third judging mode is that the analysis module judges that the coating process of the battery cell pole piece meets the preset standard; and the third judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than the number of secondary preset cracks.
Further, the analysis module records a difference between the number of cracks on the surface of the battery cell pole piece and the number of the first-stage preset cracks as a number difference in the first judgment mode, and determines a reason judgment mode that a one-time coating process for the battery cell pole piece does not meet a preset standard according to the number difference, wherein:
the first reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the moving speed of the battery cell pole piece in the coating process of the battery cell pole piece by the coating module does not meet the preset standard, and the transmission speed of the transmission mechanism is adjusted to a corresponding value according to the quantity difference value; the first cause judgment mode meets the condition that the number difference value is smaller than or equal to a preset number difference value preset in the analysis module;
the second reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the distance between the die head slit in the coating module and the battery cell pole piece is larger than the preset standard, and adjusts the distance between the die head slit in the coating module and the battery cell pole piece to a corresponding value according to the quantity difference; the second cause judgment mode satisfies that the number difference is larger than the preset number difference.
Further, the analysis module records the difference between the preset number difference and the number difference as a first number difference in the first cause judgment mode, and determines an adjustment mode for the conveying speed of the conveying mechanism according to the first number difference, wherein:
the first adjusting mode is that the analysis module uses a first adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the first adjusting mode meets the condition that the first quantity difference value is larger than a first-level preset first quantity difference value preset in the analysis module;
the second adjusting mode is that the analysis module uses a second adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the second adjusting mode meets the condition that the first quantity difference value is smaller than or equal to the first-level preset first quantity difference value and larger than or equal to the second-level preset first quantity difference value preset in the analysis module;
the third adjusting mode is that the analysis module uses a third adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the third adjusting mode meets the condition that the first quantity difference value is smaller than the second-level preset first quantity difference value.
Further, the analysis module records the difference between the number difference and the preset number difference as a second number difference and determines a distance adjustment mode for the distance between the die slot and the electrode sheet in the coating module according to the second number difference in the second cause judgment mode, wherein:
The first interval adjusting mode is that the analysis module uses a first interval adjusting coefficient to adjust the interval between the die head slit and the battery cell pole piece to a corresponding value; the first interval adjusting mode meets the condition that the second quantity difference value is larger than a first-level preset second quantity difference value preset in the analysis module;
the second interval adjusting mode is that the analysis module uses a second interval adjusting coefficient to adjust the interval between the die head slit and the electrode slice to a corresponding value; the second interval adjustment mode meets the condition that the second quantity difference value is smaller than or equal to the first-level preset second quantity difference value and larger than or equal to a second-level preset second quantity difference value preset in the analysis module;
the third interval adjusting mode is that the analysis module adjusts the interval between the die head slit and the electrode slice to a corresponding value by using a third interval adjusting coefficient; the third interval adjusting mode meets the condition that the second quantity difference value is smaller than the second-level preset second quantity difference value.
Further, after the interval between the die slot and the electrode sheet is adjusted to a corresponding value by the analysis module, the raw material feeding amount is recalculated according to the width of the electrode sheet, the interval between the corrected die slot and the electrode sheet and the conveying speed of the conveying mechanism, and the feeding amount of the coating module in the secondary coating process is synchronously corrected to the corresponding value.
Further, the analysis module divides the battery cell pole piece into a plurality of equal areas in the second determination mode, marks the collected variance value of the number of cracks in each area as a discrete value, and determines the determination mode of the reason that the process of coating the battery cell pole piece does not meet the preset standard according to the discrete value, wherein:
the first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the coating module shifts the moving path of the conveying pole piece in the coating process of the battery cell pole piece, and the analysis module controls the coating module to carry out deviation correction treatment on the battery cell pole piece; the first judgment mode meets the condition that the discrete value is larger than a preset discrete value preset in the analysis module;
the second judgment mode is that the analysis module determines specific reasons that the coating process of the battery cell pole piece does not meet preset standards according to the crack distribution direction; the second judgment mode satisfies that the discrete value is smaller than or equal to the preset discrete value.
Further, in the second judging mode, the analyzing module marks the ratio of the number of cracks with the included angle smaller than the preset included angle to the total number of cracks, which is preset in the analyzing module, between the crack direction and the preset reference direction as a same-direction duty ratio, and determines a specific reason judging mode that the coating process of the battery cell pole piece does not meet the preset standard according to the same-direction duty ratio, wherein:
The first specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the tension of the transmission mechanism when transmitting the battery cell pole piece is larger than the preset standard, and the analysis module adjusts the tension of the transmission mechanism when transmitting the battery cell pole piece to a corresponding value according to the homodromous duty ratio; the first specific cause judgment mode meets the condition that the homodromous duty ratio is larger than a preset homodromous duty ratio preset in the analysis module;
the second specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the temperature of the drying module is higher than the preset standard, and the analysis module adjusts the temperature of the drying module to a corresponding value according to the homodromous duty ratio; the second specific cause judgment mode meets the requirement that the homodromous duty ratio is smaller than or equal to the preset homodromous duty ratio.
Further, the analysis module records a difference between the homodromous duty ratio and the preset homodromous duty ratio as a duty ratio difference in the first specific cause judgment mode, and determines a tension adjustment mode for conveying the tension of the core pole piece by the conveying mechanism of the core pole piece according to the duty ratio difference, wherein:
The first tension adjusting mode is that the analysis module uses a first tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the first tension adjusting mode meets the condition that the duty ratio difference is larger than a first-level preset duty ratio difference preset in the analysis module;
the second tension adjusting mode is that the analysis module uses a second tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the second tension adjusting mode meets the condition that the duty ratio difference is smaller than or equal to the primary preset duty ratio difference and larger than or equal to a secondary preset duty ratio difference preset in the analysis module;
the third tension adjusting mode is that the analysis module uses a third tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the third tension adjusting mode meets the condition that the duty ratio difference is smaller than the second-level preset duty ratio difference.
Further, the analysis module records the difference between the preset homodromous duty ratio and the homodromous duty ratio as a standard deviation in the second specific cause determination mode, and determines a temperature adjustment mode for the drying temperature of the drying module according to the standard deviation, wherein:
The first temperature regulation mode is that the analysis module uses a first temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the first temperature regulation mode meets the condition that the standard deviation value is larger than a first-level preset standard deviation value preset in the analysis module;
the second temperature regulation mode is that the analysis module uses a second temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the second temperature regulation mode meets the condition that the standard deviation value is smaller than or equal to the first-level preset standard deviation value and larger than or equal to a second-level preset standard deviation value preset in the analysis module;
the third temperature regulation mode is that the analysis module uses a third temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the third temperature regulation mode meets the condition that the standard deviation value is smaller than the second-level preset standard deviation value.
Compared with the prior art, the method has the beneficial effects that by carrying out double-layer coating twice and carrying out surface detection in the middle of coating the battery cell pole piece, whether the operation parameters in the coating process meet the preset standard or not can be timely found, so that the operation parameters are timely corrected, and the coating yield of the battery cell pole piece is improved.
Further, the invention can judge whether the process of coating the battery core meets the preset standard or not by detecting the number of cracks on the surface of the battery core pole piece, so that corresponding processing is carried out according to different judging results, and the coating yield of the battery core pole piece is further improved.
Further, the method and the device divide the reasons which do not meet the preset standard into the speed shifting problem and the space problem by calculating the quantity difference and comparing the quantity difference with the preset standard, so that the parameters which do not meet the preset standard are judged according to the corresponding reasons, and the coating yield of the battery cell pole pieces is further improved.
Further, the invention calculates the first quantity difference value and compares the first quantity difference value with the preset standard, so that the corresponding adjustment coefficient is selected according to the actual situation to adjust the moving speed to the corresponding value, and the defect of insufficient adjustment precision caused by using the same adjustment coefficient is avoided, thereby further improving the coating yield of the battery cell pole piece.
Further, the invention calculates the second quantity difference and compares the second quantity difference with the preset standard to select the corresponding spacing adjustment coefficient, thereby rapidly completing the adjustment mode aiming at the spacing, and further improving the coating yield of the battery cell pole pieces.
Furthermore, the invention corrects the raw material feeding amount to avoid the situation that excessive coating occurs on the surface of the coated electrode sheet caused by excessive raw material feeding amount, thereby further improving the coating yield of the electrode sheet.
Further, the method and the device can quickly determine the specific reason that the one-time coating process of the battery cell pole piece does not meet the preset standard by calculating the same direction and comparing with the preset standard, so that the operation parameters to be adjusted are quickly determined according to the specific reason, the adjustment of the parameters is quickly completed, and the coating yield of the battery cell pole piece is further improved.
Further, the invention calculates the duty ratio difference value, thereby selecting the corresponding tension adjustment coefficient according to the duty ratio difference value, avoiding the situation that the surface tension of the electrode sheet is too low to cause wrinkles due to excessive tension adjustment, and further improving the coating yield of the electrode sheet.
Furthermore, the temperature regulation mode aiming at the temperature can be rapidly determined by calculating the standard deviation value and comparing the standard deviation value with the preset standard, and the drying temperature is regulated by different temperature regulation coefficients, so that the regulated temperature meets the actual use requirement, and the coating yield of the battery cell pole piece is further improved.
Drawings
FIG. 1 is a flow chart of a method for preparing a double-layer coated battery cell pole piece according to the invention;
FIG. 2 is a schematic diagram of an apparatus for preparing a double-coated battery cell pole piece according to the present invention;
FIG. 3 is a flowchart of a decision method according to the present invention;
FIG. 4 is a flow chart of the adjustment mode determination according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a flow chart of a method for preparing a double-layer coated electrode sheet according to the present invention, fig. 2 is a device structure diagram of the method for preparing a double-layer coated electrode sheet according to the present invention, including:
the device comprises an analysis module 1, a coating module 2, a drying module 3, a detection module 4, a conveying mechanism 5 and a preparation module which are not shown in the figure;
step S1, a preparation module prepares a metal foil of an electrode slice according to preset parameters in the preparation module;
s2, the coating module finishes one-time coating of the electrode slice by using preset parameters in the coating module;
step S3, the analysis module controls the conveying mechanism to output the coated electrode slices to the drying module, and the drying module carries out drying treatment on the coated electrode slices;
S4, the analysis module controls the detection module to acquire the image information of the surface of the dried battery cell pole piece output by the drying module, and judges whether the coating process of the battery cell pole piece meets the preset standard according to the crack characteristics in the image information;
step S5, when the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, determining the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number or the distribution of cracks on the surface of the battery cell pole piece, and adjusting the corresponding operation parameters of the coating module, the conveying mechanism or the drying module to the corresponding values based on the determined reason;
step S6, when the analysis module judges that the coating process of the battery cell pole piece meets the preset standard, controlling the coating module to carry out secondary coating on the battery cell pole piece and repeating the steps S3-S5 to judge whether the secondary coating meets the preset standard or not;
and S7, when the analysis module judges that the secondary coating meets the preset standard, the preparation of the battery cell pole piece is completed.
Referring to fig. 3, which is a decision flow chart of the decision mode according to the present invention, the analysis module determines, according to the number of cracks on the surface of the electrode sheet, whether the process of one-time coating for the electrode sheet meets a preset criterion, wherein:
The first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and judges the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number of cracks; the first judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is larger than the number of first-level preset cracks preset in the analysis module; setting the number of the first-stage preset cracks to be 30;
the second judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and determines the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the crack distribution condition; the second judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than or equal to the first-level preset number of cracks and larger than or equal to the second-level preset number of cracks preset in the analysis module; setting the number of the secondary preset cracks to be 15;
the third judging mode is that the analysis module judges that the coating process of the battery cell pole piece meets the preset standard; and the third judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than the number of secondary preset cracks.
Specifically, the analysis module records the difference between the number of cracks on the surface of the battery cell pole piece and the number of the first-stage preset cracks as a number difference in the first judgment mode, and determines a reason judgment mode that the process of one-time coating of the battery cell pole piece does not meet a preset standard according to the number difference, wherein:
the first reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the moving speed of the battery cell pole piece in the coating process of the battery cell pole piece by the coating module does not meet the preset standard, and the transmission speed of the transmission mechanism is adjusted to a corresponding value according to the quantity difference value; the first cause judgment mode meets the condition that the number difference value is smaller than or equal to a preset number difference value preset in the analysis module; setting the preset number difference as 35;
the second reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the distance between the die head slit in the coating module and the battery cell pole piece is larger than the preset standard, and adjusts the distance between the die head slit in the coating module and the battery cell pole piece to a corresponding value according to the quantity difference; the second cause judgment mode satisfies that the number difference is larger than the preset number difference.
Referring to fig. 4, which is a flowchart of the adjustment mode determination according to the present invention, the analysis module records the difference between the preset number difference and the number difference as a first number difference and determines an adjustment mode for the conveying speed of the conveying mechanism according to the first number difference in the first cause determination mode, wherein:
the first adjusting mode is that the analysis module uses a first adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the first adjusting mode meets the condition that the first quantity difference value is larger than a first-level preset first quantity difference value preset in the analysis module; setting the first adjusting coefficient to be 1.10, wherein the first-stage preset first quantity difference value is 25;
the second adjusting mode is that the analysis module uses a second adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the second adjusting mode meets the condition that the first quantity difference value is smaller than or equal to the first-level preset first quantity difference value and larger than or equal to the second-level preset first quantity difference value preset in the analysis module; setting the second adjusting coefficient to be 1.20, wherein the second-level preset first quantity difference value is 15;
The third adjusting mode is that the analysis module uses a third adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the third adjusting mode meets the condition that the first quantity difference value is smaller than the second-level preset first quantity difference value; the third adjustment coefficient is set to 1.30.
Specifically, the analysis module records the difference between the number difference and the preset number difference as a second number difference and determines a distance adjustment mode for the distance between the die slot and the electrode sheet in the coating module according to the second number difference in the second cause judgment mode, wherein:
the first interval adjusting mode is that the analysis module uses a first interval adjusting coefficient to adjust the interval between the die head slit and the battery cell pole piece to a corresponding value; the first interval adjusting mode meets the condition that the second quantity difference value is larger than a first-level preset second quantity difference value preset in the analysis module; setting the first interval adjusting coefficient to be 0.75, and presetting the first-stage preset second quantity difference value to be 20;
the second interval adjusting mode is that the analysis module uses a second interval adjusting coefficient to adjust the interval between the die head slit and the electrode slice to a corresponding value; the second interval adjustment mode meets the condition that the second quantity difference value is smaller than or equal to the first-level preset second quantity difference value and larger than or equal to a second-level preset second quantity difference value preset in the analysis module; setting the second interval adjusting coefficient to be 0.85, and setting the second-level preset second quantity difference value to be 40;
The third interval adjusting mode is that the analysis module adjusts the interval between the die head slit and the electrode slice to a corresponding value by using a third interval adjusting coefficient; the third interval adjusting mode meets the condition that the second quantity difference value is smaller than the second-level preset second quantity difference value; and setting the third interval regulating coefficient to be 0.95.
Specifically, after the interval between the die slot and the electrode sheet is adjusted to a corresponding value by the analysis module, the raw material feeding amount is recalculated according to the width of the electrode sheet, the interval between the corrected die slot and the electrode sheet and the conveying speed of the conveying mechanism, and the feeding amount of the coating module in the secondary coating process is synchronously corrected to the corresponding value.
Specifically, the analysis module divides the battery cell pole piece into a plurality of equal areas in the second determination mode, marks the variance value of the number of cracks in each acquired area as a discrete value, and determines the determination mode of the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the discrete value, wherein:
the first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the coating module shifts the moving path of the conveying pole piece in the coating process of the battery cell pole piece, and the analysis module controls the coating module to carry out deviation correction treatment on the battery cell pole piece; the first judgment mode meets the condition that the discrete value is larger than a preset discrete value preset in the analysis module; setting the preset discrete value to be 100;
The second judgment mode is that the analysis module determines specific reasons that the coating process of the battery cell pole piece does not meet preset standards according to the crack distribution direction; the second judgment mode satisfies that the discrete value is smaller than or equal to the preset discrete value.
Specifically, the analysis module records the ratio of the number of cracks with an included angle smaller than a preset included angle between the crack direction and a preset reference direction preset in the analysis module to the total number of cracks as a homodromous duty ratio in the second cause judgment mode, and determines that the process of coating the battery cell pole piece does not meet the specific cause judgment mode of the preset standard according to the homodromous duty ratio, wherein:
the first specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the tension of the transmission mechanism when transmitting the battery cell pole piece is larger than the preset standard, and the analysis module adjusts the tension of the transmission mechanism when transmitting the battery cell pole piece to a corresponding value according to the homodromous duty ratio; the first specific cause judgment mode meets the condition that the homodromous duty ratio is larger than a preset homodromous duty ratio preset in the analysis module; setting the preset homodromous ratio to be 40%;
The second specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the temperature of the drying module is higher than the preset standard, and the analysis module adjusts the temperature of the drying module to a corresponding value according to the homodromous duty ratio; the second specific cause judgment mode meets the requirement that the homodromous duty ratio is smaller than or equal to the preset homodromous duty ratio.
Specifically, the analysis module records a difference between the homodromous duty ratio and the preset homodromous duty ratio as a duty ratio difference in the first specific cause judgment mode, and determines a tension adjustment mode for conveying the tension of the core pole piece by the conveying mechanism of the core pole piece according to the duty ratio difference, wherein:
the first tension adjusting mode is that the analysis module uses a first tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the first tension adjusting mode meets the condition that the duty ratio difference is larger than a first-level preset duty ratio difference preset in the analysis module; setting the first tension adjustment coefficient to be 0.91, wherein the first-stage preset duty ratio difference value is 30%;
the second tension adjusting mode is that the analysis module uses a second tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the second tension adjusting mode meets the condition that the duty ratio difference is smaller than or equal to the primary preset duty ratio difference and larger than or equal to a secondary preset duty ratio difference preset in the analysis module; setting the second tension adjustment coefficient to be 0.81, wherein the second-level preset duty ratio difference value is 15%;
The third tension adjusting mode is that the analysis module uses a third tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the third tension adjusting mode meets the condition that the duty ratio difference is smaller than the second-level preset duty ratio difference; the third tension adjustment coefficient is set to 0.75.
Specifically, the analysis module records the difference between the preset homodromous duty ratio and the homodromous duty ratio as a standard deviation and determines a temperature adjustment mode of the drying temperature of the drying module according to the standard deviation in the second specific cause determination mode, wherein:
the first temperature regulation mode is that the analysis module uses a first temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the first temperature regulation mode meets the condition that the standard deviation value is larger than a first-level preset standard deviation value preset in the analysis module; setting the first temperature regulation coefficient to be 0.95, wherein the first-level preset standard deviation value is 13%;
the second temperature regulation mode is that the analysis module uses a second temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the second temperature regulation mode meets the condition that the standard deviation value is smaller than or equal to the first-level preset standard deviation value and larger than or equal to a second-level preset standard deviation value preset in the analysis module; setting the second temperature regulation coefficient to be 0.90, and setting the second-level preset standard deviation value to be 21%;
The third temperature regulation mode is that the analysis module uses a third temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the third temperature regulation mode meets the condition that the standard deviation value is smaller than the second-level preset standard deviation value; the third temperature adjustment coefficient is set to 0.85.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The preparation method of the double-layer coated battery cell pole piece is characterized by comprising the following steps of:
Step S1, a preparation module prepares a metal foil of an electrode slice according to preset parameters in the preparation module;
s2, the coating module finishes one-time coating of the electrode slice by using preset parameters in the coating module;
step S3, the analysis module controls the conveying mechanism to output the coated electrode slices to the drying module, and the drying module carries out drying treatment on the coated electrode slices;
s4, the analysis module controls the detection module to acquire the image information of the surface of the dried battery cell pole piece output by the drying module, and judges whether the coating process of the battery cell pole piece meets the preset standard according to the crack characteristics in the image information;
step S5, when the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, determining the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number or the distribution of cracks on the surface of the battery cell pole piece, and adjusting the corresponding operation parameters of the coating module, the conveying mechanism or the drying module to the corresponding values based on the determined reason;
step S6, when the analysis module judges that the primary coating process of the battery cell pole piece meets the preset standard, controlling the coating module to carry out secondary coating on the battery cell pole piece and repeating the steps S3-S5 to judge whether the secondary coating meets the preset standard;
Step S7, the analysis module completes preparation of the electrode slice of the battery cell when judging that the secondary coating meets the preset standard;
in the step S4, the analysis module determines, according to the number of cracks on the surface of the electrode sheet, a determination mode of whether the coating process for the electrode sheet meets a preset standard, where:
the first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and judges the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the number of cracks; the first judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is larger than the number of first-level preset cracks preset in the analysis module;
the second judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard, and determines the reason that the coating process of the battery cell pole piece does not meet the preset standard according to the crack distribution condition; the second judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than or equal to the first-level preset number of cracks and larger than or equal to the second-level preset number of cracks preset in the analysis module;
the third judging mode is that the analysis module judges that the coating process of the battery cell pole piece meets the preset standard; the third judging mode meets the condition that the number of cracks on the surface of the battery cell pole piece is smaller than the number of secondary preset cracks;
The analysis module records the difference between the number of cracks on the surface of the battery cell pole piece and the number of the first-stage preset cracks as a number difference in the first judgment mode, and determines a reason judgment mode for that the one-time coating process of the battery cell pole piece does not meet a preset standard according to the number difference, wherein:
the first reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the moving speed of the battery cell pole piece in the coating process of the battery cell pole piece by the coating module does not meet the preset standard, and the transmission speed of the transmission mechanism is adjusted to a corresponding value according to the quantity difference value; the first cause judgment mode meets the condition that the number difference value is smaller than or equal to a preset number difference value preset in the analysis module;
the second reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the distance between the die head slit in the coating module and the battery cell pole piece is larger than the preset standard, and adjusts the distance between the die head slit in the coating module and the battery cell pole piece to a corresponding value according to the quantity difference; the second cause judgment mode satisfies that the number difference is larger than the preset number difference.
2. The method for preparing a double-coated battery cell electrode sheet according to claim 1, wherein the analysis module records a difference between the preset number difference and the number difference as a first number difference in the first cause judgment mode, and determines an adjustment mode for the conveying speed of the conveying mechanism according to the first number difference, wherein:
the first adjusting mode is that the analysis module uses a first adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the first adjusting mode meets the condition that the first quantity difference value is larger than a first-level preset first quantity difference value preset in the analysis module;
the second adjusting mode is that the analysis module uses a second adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the second adjusting mode meets the condition that the first quantity difference value is smaller than or equal to the first-level preset first quantity difference value and larger than or equal to the second-level preset first quantity difference value preset in the analysis module;
the third adjusting mode is that the analysis module uses a third adjusting coefficient to adjust the conveying speed of the conveying mechanism to a corresponding value; the third adjusting mode meets the condition that the first quantity difference value is smaller than the second-level preset first quantity difference value.
3. The method for preparing a dual-layer coated electrode sheet according to claim 1, wherein the analysis module records a difference between the number difference and the preset number difference as a second number difference in the second cause determination mode and determines a pitch adjustment mode for a pitch between the die slot and the electrode sheet in the coating module according to the second number difference value, wherein:
the first interval adjusting mode is that the analysis module uses a first interval adjusting coefficient to adjust the interval between the die head slit and the battery cell pole piece to a corresponding value; the first interval adjusting mode meets the condition that the second quantity difference value is larger than a first-level preset second quantity difference value preset in the analysis module;
the second interval adjusting mode is that the analysis module uses a second interval adjusting coefficient to adjust the interval between the die head slit and the electrode slice to a corresponding value; the second interval adjustment mode meets the condition that the second quantity difference value is smaller than or equal to the first-level preset second quantity difference value and larger than or equal to a second-level preset second quantity difference value preset in the analysis module;
the third interval adjusting mode is that the analysis module adjusts the interval between the die head slit and the electrode slice to a corresponding value by using a third interval adjusting coefficient; the third interval adjusting mode meets the condition that the second quantity difference value is smaller than the second-level preset second quantity difference value.
4. The method for preparing a double-layer coated electrode sheet according to claim 3, wherein the analysis module recalculates the raw material feeding amount according to the width of the electrode sheet, the corrected distance between the die slot and the electrode sheet and the conveying speed of the conveying mechanism after adjusting the distance between the die slot and the electrode sheet to a corresponding value, and synchronously corrects the feeding amount of the coating module to a corresponding value in the secondary coating process.
5. The method for preparing a double-layer coated battery cell electrode sheet according to claim 1, wherein the analysis module divides the battery cell electrode sheet into a plurality of equal areas in the second determination mode, marks the variance value of the number of cracks in each acquired area as a discrete value, and determines the determination mode of the reason why the coating process of the battery cell electrode sheet does not meet the preset standard according to the discrete value, wherein:
the first judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the coating module shifts the moving path of the conveying pole piece in the coating process of the battery cell pole piece, and the analysis module controls the coating module to carry out deviation correction treatment on the battery cell pole piece; the first judgment mode meets the condition that the discrete value is larger than a preset discrete value preset in the analysis module;
The second judgment mode is that the analysis module determines specific reasons that the coating process of the battery cell pole piece does not meet preset standards according to the crack distribution direction; the second judgment mode satisfies that the discrete value is smaller than or equal to the preset discrete value.
6. The method for preparing a dual-layer coated battery cell electrode sheet according to claim 5, wherein the analysis module, in the second judging manner, records a ratio of the number of cracks with an included angle smaller than a preset included angle to the total number of cracks in the preset reference direction preset in the analysis module as a homodromous duty ratio and determines a specific reason judging manner that the coating process of the battery cell electrode sheet does not meet a preset standard according to the homodromous duty ratio, wherein:
the first specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the tension of the transmission mechanism when transmitting the battery cell pole piece is larger than the preset standard, and the analysis module adjusts the tension of the transmission mechanism when transmitting the battery cell pole piece to a corresponding value according to the homodromous duty ratio; the first specific cause judgment mode meets the condition that the homodromous duty ratio is larger than a preset homodromous duty ratio preset in the analysis module;
The second specific reason judging mode is that the analysis module judges that the coating process of the battery cell pole piece does not meet the preset standard because the temperature of the drying module is higher than the preset standard, and the analysis module adjusts the temperature of the drying module to a corresponding value according to the homodromous duty ratio; the second specific cause judgment mode meets the requirement that the homodromous duty ratio is smaller than or equal to the preset homodromous duty ratio.
7. The method of claim 6, wherein the analysis module, in the first specific cause determination mode, marks a difference between the homodromous duty cycle and the preset homodromous duty cycle as a duty cycle difference, and determines a tension adjustment mode of the tension of the transmission mechanism for the battery pole piece for transmitting the battery pole piece according to the duty cycle difference, wherein:
the first tension adjusting mode is that the analysis module uses a first tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the first tension adjusting mode meets the condition that the duty ratio difference is larger than a first-level preset duty ratio difference preset in the analysis module;
the second tension adjusting mode is that the analysis module uses a second tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the second tension adjusting mode meets the condition that the duty ratio difference is smaller than or equal to the primary preset duty ratio difference and larger than or equal to a secondary preset duty ratio difference preset in the analysis module;
The third tension adjusting mode is that the analysis module uses a third tension adjusting coefficient to adjust the tension of the core pole piece conveyed by the conveying mechanism to a corresponding value; the third tension adjusting mode meets the condition that the duty ratio difference is smaller than the second-level preset duty ratio difference.
8. The method for preparing a dual-layer coated battery cell electrode sheet according to claim 6, wherein the analysis module marks a difference between the preset homodromous duty cycle and the homodromous duty cycle as a standard deviation and determines a temperature adjustment mode for a drying temperature of the drying module according to the standard deviation in the second specific cause determination mode, wherein:
the first temperature regulation mode is that the analysis module uses a first temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the first temperature regulation mode meets the condition that the standard deviation value is larger than a first-level preset standard deviation value preset in the analysis module;
the second temperature regulation mode is that the analysis module uses a second temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the second temperature regulation mode meets the condition that the standard deviation value is smaller than or equal to the first-level preset standard deviation value and larger than or equal to a second-level preset standard deviation value preset in the analysis module;
The third temperature regulation mode is that the analysis module uses a third temperature regulation coefficient to regulate the drying temperature of the drying module to a corresponding value; the third temperature regulation mode meets the condition that the standard deviation value is smaller than the second-level preset standard deviation value.
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