CN117840004A - Drying system and drying method for battery pole piece - Google Patents
Drying system and drying method for battery pole piece Download PDFInfo
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- CN117840004A CN117840004A CN202410089104.8A CN202410089104A CN117840004A CN 117840004 A CN117840004 A CN 117840004A CN 202410089104 A CN202410089104 A CN 202410089104A CN 117840004 A CN117840004 A CN 117840004A
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- 238000001035 drying Methods 0.000 title claims abstract description 121
- 238000004093 laser heating Methods 0.000 claims abstract description 108
- 238000010438 heat treatment Methods 0.000 claims abstract description 82
- 238000000576 coating method Methods 0.000 claims description 60
- 239000011248 coating agent Substances 0.000 claims description 58
- 238000001514 detection method Methods 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 41
- 238000007602 hot air drying Methods 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 35
- 238000004804 winding Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 2
- 239000002904 solvent Substances 0.000 description 21
- 230000009471 action Effects 0.000 description 6
- 239000013543 active substance Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 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
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
-
- 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 application relates to the technical field of batteries, in particular to a drying system and a drying method for a battery pole piece, wherein the drying system comprises a first baking unit and a second baking unit, and the first baking unit comprises a laser heating module and is used for carrying out first laser baking on the pole piece to be dried; the second baking unit comprises an infrared heating module for infrared baking of the pole piece baked by the first laser. According to the technical scheme, the laser heating module and the infrared heating module are integrated in the drying system, the problem that the existing drying system cannot give consideration to the pole piece baking speed and the baking precision is solved, and the baking efficiency and the baking quality of the pole piece are comprehensively improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a drying system and a drying method for a battery pole piece.
Background
In the production process of the lithium battery, a coating process is a key link in the manufacturing of the positive electrode of the lithium battery. Coating refers to a method for preparing a composite film by coating pasty polymer, molten polymer or polymer solution on a film pole piece; after coating, the coated pole piece needs to be dried to a certain degree of dryness, so that the quality of the coated pole piece is ensured, and the service life and performance of the coated pole piece are improved. Therefore, the baking forming is a key node in the coating process, and the occurrence of the anomalies such as powder falling, scorching, baking, unqualified compaction density, inconsistent solvent volatilization, insufficient adhesion between the slurry and the foil, and the like of the coated pole piece are directly related to the baking quality.
In principle, the baking is a process of conducting external heat to the coated pole piece, is an energy input and output process, and is a process of completing heat exchange; at present, common pole piece baking modes comprise hot air baking, infrared baking, laser baking and the like, wherein the infrared baking has the defect of low baking speed, and the hot air baking and the laser baking have the problems of baking uniformity, temperature control accuracy and the like; the existing pole piece baking method is difficult to consider the baking speed of the pole piece and the temperature control accuracy in the baking process.
Disclosure of Invention
The application provides a drying system and a drying method of a battery pole piece, which can improve the temperature control accuracy of the pole piece in the baking process and further improve the baking quality of the pole piece while considering the baking speed.
In a first aspect, an embodiment of the present application provides a method for drying a battery pole piece, including the steps of:
carrying out primary laser baking on the pole piece to be dried;
and carrying out infrared baking on the pole piece subjected to the first laser baking to obtain a dry pole piece.
In an embodiment, the first laser baking includes a temperature raising stage and a constant temperature stage, in the temperature raising stage, the power of the laser heating module of the first laser baking is adjusted to a first threshold, and when the temperature of the pole piece reaches the temperature of the constant temperature stage, the power of the laser heating module of the first laser baking is adjusted down so that the temperature of the pole piece is just maintained within the temperature interval of the constant temperature stage.
In one embodiment, the laser wavelength of the first laser bake is 600 μm to 1080 μm.
In one embodiment, the laser power of the first laser baking is 2000W to 30000W.
In one embodiment, the laser power density of the first laser bake is120W/cm 2 ～160W/cm 2 。
In one embodiment, the first laser baking has a heating stage, and the heating stage is 0.1s to 3s.
In one embodiment, the first laser bake has a constant temperature stage at a temperature of 125 ℃ to 160 ℃.
In one embodiment, the first laser bake time is 5s to 65s.
In one embodiment, the infrared wavelength of the infrared bake is 1.0 μm to 1.4 μm.
In one embodiment, the infrared power of the infrared baking is 500W to 9000W.
In one embodiment, the infrared baking has an infrared power density of 160W/m 2 ～200W/m 2 。
In one embodiment, the infrared bake temperature is 120 ℃ to 145 ℃.
In one embodiment, the infrared baking time is 5s to 30s.
In one embodiment, after the infrared baking, the drying method further comprises hot air drying treatment of the pole piece after the infrared baking, wherein the temperature of the hot air drying treatment is 70-110 ℃, and the fan frequency of the hot air drying treatment is 16-35 Hz.
In one embodiment, after the hot air drying treatment, the drying method further includes performing a second laser baking on the pole piece after the hot air drying treatment.
In one embodiment, the laser wavelength of the second laser bake is 600 μm to 1080 μm.
In one embodiment, the laser power of the second laser baking is 500W to 1500W.
In one embodiment, the laser power density of the second laser bake is 30W/cm 2 ～80W/cm 2 。
In one embodiment, the second laser baking time is 5s to 65s.
In an embodiment, before the first laser baking, the drying method further includes unreeling the pole piece to provide a pole piece to be dried; and/or the number of the groups of groups,
the drying method further comprises the step of winding the pole piece of the obtained dry pole piece.
In one embodiment, the drying method further comprises rectifying and/or tension-adjusting the pole piece after unreeling the pole piece.
In one embodiment, the drying method further comprises applying a slurry to the pole piece after unreeling the pole piece and before the first laser firing.
In a second aspect, the present application further provides a drying system for a battery pole piece, including:
The first baking unit comprises a first laser heating module and is used for carrying out first laser baking on the pole piece to be dried;
and the second baking unit comprises an infrared heating module and is used for infrared baking of the pole piece baked by the first laser.
In an embodiment, the first baking unit further includes a first temperature detection module, where the first temperature detection module is configured to detect a temperature of the pole piece in the first laser baking process, the first laser heating module is electrically connected to the first temperature detection module, and power of the first laser heating module is adjusted according to a detection result of the first temperature detection module; and/or the number of the groups of groups,
the second baking unit further comprises a second temperature detection module, the second temperature detection module is electrically connected with the infrared heating module, the second temperature detection module is used for detecting the temperature of the pole piece in the infrared baking process, and the power of the infrared heating module is adjusted according to the detection result of the second temperature detection module.
In an embodiment, the drying system further includes a control module, where the control module is electrically connected to the first laser heating module, the infrared heating module, the first temperature detecting module, and the second temperature detecting module, and the control module adjusts the power of the infrared heating module according to the detection result of the second temperature detecting module, and adjusts the power of the first laser heating module according to the detection result of the first temperature detecting module.
In an embodiment, the drying system further comprises an oven and a hot air drying module, wherein the light outlets of the first laser heating module and the infrared heating module are communicated with the interior of the oven, and the air outlet of the hot air drying module is communicated with the interior of the oven.
In one embodiment, the drying system further comprises a second laser heating module disposed downstream of the infrared heating module.
In an embodiment, the first laser heating modules, the infrared heating modules and the second laser heating modules are arranged at equal intervals on the same side of the pole piece, the number of the hot drying modules is multiple, and the hot air drying modules are respectively arranged between the first laser heating modules, the infrared heating modules and the second laser heating modules, which are arranged on the same side of the pole piece.
In an embodiment, the first laser heating module, the infrared heating module and the second laser heating module are arranged on two sides of the pole piece trend, the first laser heating module, the infrared heating module and the second laser heating module which are located on one side of the pole piece trend, and the first laser heating module, the infrared heating module and the second laser heating module which are located on the other side of the pole piece trend are arranged in a staggered mode along the trend of the pole piece.
In an embodiment, the drying system further comprises an unreeling unit for supplying the pole piece and a reeling unit for reeling the pole piece, wherein the first laser heating module and the infrared heating module are sequentially arranged along the trend of the pole piece, and the first laser heating module is located at the upstream of the infrared heating module.
In an embodiment, the drying system further comprises a tension adjusting unit and/or a deviation rectifying unit, and the tension adjusting unit and/or the deviation rectifying unit are/is located downstream of the unreeling unit.
In an embodiment, the drying system further comprises a coating unit, and the coating unit is arranged on both sides of the pole piece between the unreeling unit and the first laser heating module.
Compared with the prior art, the technical scheme has at least the following technical effects:
according to the drying method, the pole pieces are baked successively by combining the laser heating mode and the infrared heating mode, so that the problem that the existing drying method cannot give consideration to the baking speed and the baking precision is solved, and the baking efficiency and the baking quality of the pole pieces are comprehensively improved. In the technical scheme, in the process of baking the pole piece, the pole piece is baked for the first time by adopting a laser heating mode, so that the temperature of the pole piece is quickly increased, a large amount of solvents on the surface and in the interior of a pole piece coating are quickly evaporated, and the time of a heating stage and a constant drying rate stage of the pole piece is shortened; and then the pole piece is baked in an infrared heating mode, so that the accurate regulation and control of the temperature of the pole piece in the deceleration drying stage can be realized, the situations of degradation of an adhesive, deterioration of an active substance and the like in a pole piece coating caused by overlarge temperature fluctuation in the deceleration drying stage are avoided, and the baking quality of the pole piece is improved.
According to the technical scheme, the laser heating module and the infrared heating module are integrated in the drying system, the problem that the existing drying system cannot give consideration to the pole piece baking speed and the baking precision is solved, and the baking efficiency and the baking quality of the pole piece are comprehensively improved. The inventor researches that the pole piece can sequentially go through three dynamic stages of a heating stage, a constant drying rate stage and a deceleration drying stage in the drying process of the pole piece. The heating stage mainly comprises the steps of evaporating a solvent on the surface of the pole piece coating and diffusing the solvent in a gas-liquid two-phase mode through an interface; when the solvent on the surface of the pole piece coating is completely vaporized and enters a constant drying rate stage, the solvent such as NMP, water and the like in the pole piece coating is mainly evaporated in a large quantity, and in the stage, the solvent in the pole piece coating is continuously migrated to the surface due to capillary action and is enriched and evaporated on the surface, and the pole piece coating is gradually contracted, so that the time consumption of the stage is relatively long; when the moisture content in the coating is low and reaches a critical state, a deceleration drying stage is started, the drying rate of the stage is controlled by the migration rate of the solvent, namely by the particle and gap distribution mode of the pole piece coating, and the baking temperature control precision is high in the stage. In the technical scheme, in the process of baking the pole piece, a first laser heating module is adopted to bake the pole piece for the first time, and the first laser heating module can enable the temperature of the pole piece to be quickly increased, so that a large amount of solvents on the surface and in the interior of a pole piece coating are quickly evaporated, and the time of a heating stage and a constant drying rate stage of the pole piece is shortened; and then the pole piece is baked by adopting an infrared heating module, the power adjustment precision of the infrared heating module is high, the accurate adjustment and control of the temperature of the pole piece in the deceleration drying stage can be realized, the situations of binder degradation, active substance deterioration and the like in the pole piece coating caused by overlarge temperature fluctuation in the deceleration drying stage are avoided, and the baking quality of the pole piece is improved. The drying system integrates the laser heating module and the infrared heating module together, and can be used for quickly baking the polar plate with high efficiency and high quality.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic flow chart of a drying method according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a drying system according to an embodiment of the present application;
fig. 3 is a schematic structural view of a drying system according to another embodiment of the present application;
fig. 4 is a schematic structural view of a drying system according to another embodiment of the present application.
Reference numerals:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Drying system | 110 | First laser heating module |
| 120 | Infrared heating module | 130 | Hot air drying module |
| 140 | Baking oven | 150 | Second laser heating module |
| 160 | Roller wheel | 171 | Unreeling unit |
| 172 | Rolling unit | 181 | Tension adjusting unit |
| 182 | Deviation rectifying unit | 183 | Coating module |
| 200 | Pole piece |
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
At present, common pole piece baking modes comprise hot air baking, infrared baking, laser baking and the like, wherein the infrared baking has the defect of low baking speed, and the hot air baking and the laser baking have the problems of baking uniformity, temperature control accuracy and the like; the existing pole piece baking method is difficult to consider the baking speed of the pole piece and the temperature control accuracy in the baking process.
In order to solve the technical problems, in a first aspect, the present application provides a method for drying a battery pole piece.
Referring to fig. 1, in an embodiment of the present application, the drying method includes the following steps:
s10, carrying out primary laser baking on the pole piece to be dried;
s20, carrying out infrared baking on the pole piece subjected to the first laser baking to obtain a dry pole piece.
According to the drying method, the pole pieces are baked successively by combining the laser heating mode and the infrared heating mode, so that the problem that the existing drying method cannot give consideration to the baking speed and the baking precision is solved, and the baking efficiency and the baking quality of the pole pieces are comprehensively improved. In the technical scheme, in the process of baking the pole piece, the pole piece is baked for the first time by adopting a laser heating mode, so that the temperature of the pole piece is quickly increased, a large amount of solvents on the surface and in the interior of a pole piece coating are quickly evaporated, and the time of a heating stage and a constant drying rate stage of the pole piece is shortened; and then the pole piece is baked in an infrared heating mode, so that the accurate regulation and control of the temperature of the pole piece in the deceleration drying stage can be realized, the situations of degradation of an adhesive, deterioration of an active substance and the like in a pole piece coating caused by overlarge temperature fluctuation in the deceleration drying stage are avoided, and the baking quality of the pole piece is improved.
In an embodiment, the first laser baking includes a temperature raising stage and a constant temperature stage, in which the power of the laser heating module of the first laser baking (corresponding to the first laser heating module 110 below) is adjusted to a first threshold, and in a preferred embodiment, the first threshold is a maximum power value of the laser heating module, and when the temperature of the pole piece reaches the temperature of the constant temperature stage, the power of the laser heating module of the first laser baking (corresponding to the first laser heating module 110 below) is adjusted downward so that the temperature of the pole piece is just maintained within the temperature range of the constant temperature stage. Through will at the intensification stage the power of the laser heating module of first laser baking (corresponding below first laser heating module 110) is adjusted to first threshold, can make the quick rising of pole piece surface's temperature, and the solvent in the pole piece coating gets into boiling fast, has effectively improved the drying efficiency of pole piece, and through when the temperature of pole piece reaches the temperature of constant temperature stage, will the power of the laser heating module of first laser baking (corresponding below first laser heating module 110) is suitably down-regulated for the solvent in the pole piece coating volatilizes gently, is favorable to avoiding toasting the too high and pole piece surface coating fracture, can promote the baking quality of pole piece, still plays energy-conserving effect simultaneously.
More specifically, in one embodiment, the laser wavelength of the first laser bake is 600 μm to 1080 μm, and specifically may be 600 μm, 700 μm, 800 μm, 900 μm, 1080 μm, or any value therebetween.
In an embodiment, the laser power of the first laser baking is 2000W to 30000W, specifically, 2000W, 2200W, 2400W, 2600W, 2800W, 30000W or any value therebetween.
In one embodiment, the laser power density of the first laser bake is 120W/cm 2 ～160W/cm 2 Specifically, the concentration of the catalyst may be 120W/cm 2 、130W/cm 2 、140W/cm 2 、160W/cm 2 Or any value therebetween.
In one embodiment, the time of the heating stage is 0.1s to 3s, and may specifically be 0.1s, 1s, 2s, 3s or any value therebetween. The pole piece is subjected to first laser baking in a laser heating mode, so that the temperature of the surface of the pole piece can be quickly increased, and the solvent in the pole piece coating can be quickly evaporated.
The temperature in the constant temperature stage is 125-160 ℃, and specifically can be 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃, 160 ℃ or any value between the two. By controlling the temperature of the constant temperature stage in the range, the baking efficiency of the pole piece can be improved on the premise of considering the baking quality; the specific temperature of the constant temperature stage is related to the coating thickness of the pole piece, and the thicker the pole piece is coated, the more difficult the pole piece is dried, and the longer the temperature of the constant temperature stage is.
In one embodiment, the time of the first laser baking is 5s to 65s, and may specifically be 5s, 10s, 16s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s, 60s, 65s or any value therebetween. The specific time of the first laser baking is related to the coating thickness of the pole piece, and the thicker the pole piece is coated, the more difficult it is to dry, and the longer the first laser baking time is, for example: compared with a ternary positive plate, the coating area of the lithium iron phosphate plate is thicker, and the first laser baking time is longer.
In one embodiment, the infrared wavelength of the infrared baking is 1.0 μm to 1.4 μm, and may specifically be 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, or any value therebetween.
In one embodiment, the infrared power of the infrared baking is 500W to 9000W, specifically 500W, 1000W, 2000W, 3000W, 4000W, 5000W, 6000W, 7000W, 8000W, 9000W or any value therebetween. The infrared power in the infrared baking process can be adjusted in real time according to the temperature of the surface of the pole piece so as to accurately regulate and control the infrared baking temperature.
In one embodiment, the infrared baking has an infrared power density of 160W/m 2 ～200W/m 2 Specifically, 160W/m 2 、170W/m 2 、180W/m 2 、180W/m 2 、190W/m 2 、200W/m 2 Or any value therebetween.
In one embodiment, the temperature of the infrared baking is 120 ℃ to 145 ℃, specifically 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃ or any value therebetween. By controlling the temperature of the infrared baking in the range, the baking efficiency of the pole piece can be improved on the premise of considering the baking quality.
In one embodiment, the infrared baking time is 5s to 30s, and may specifically be 5s, 10s, 16s, 20s, 25s, 30s or any value therebetween; the infrared baking time is too short, the pole piece may not be dried, and the system baking time is too long, which may affect the baking quality of the pole piece.
In one embodiment, the drying method is performed based on the drying system 100 as described above.
In an embodiment, after the infrared baking, the drying method further includes performing hot air drying treatment on the infrared baked pole piece, so as to further dry and remove dust on the infrared baked pole piece.
The temperature of the hot air drying treatment is 70-110 ℃, and specifically can be 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃ or any value between the two.
The fan frequency of the hot air drying treatment is 16 Hz-35 Hz, and can be specifically 16Hz, 20Hz, 25Hz, 30Hz, 35Hz or any value between the two.
In the later drying stage (the later stage of the deceleration drying stage), the pole piece is dried by adopting hot air convection, so that solute in the pole piece coating can be prevented from migrating to the surface of the pole piece coating through capillary action, the influence on baking quality caused by migration of solute such as adhesive is further reduced, and the baking quality of the pole piece is further improved.
In an embodiment, in the first laser baking process, the pole piece is dried by adopting hot air convection at the same time, and/or in the infrared baking process, the pole piece is dried by adopting hot air at the same time, so that the drying efficiency of the pole piece can be further improved.
In one embodiment, after the hot air drying treatment, the drying method further includes performing a second laser baking on the pole piece after the hot air drying treatment. The second laser baking can transfer energy to solutes transferred to the surface of the pole piece coating, so that the solutes are transferred back to the inside of the pole piece coating, and the baking quality of the pole piece is further improved.
Specifically, the laser wavelength of the second laser baking is 600 μm to 1080 μm, and specifically may be 600 μm, 700 μm, 800 μm, 900 μm, 1080 μm or any value therebetween.
The laser power of the second laser baking is 500W-1500W, and can be specifically 500W, 800W, 1000W, 1200W, 1400W, 15000W or any value between them.
The laser power density of the second laser baking is 30W/cm 2 ～80W/cm 2 Specifically, it may be 30W/cm 2 、40W/cm 2 、50W/cm 2 、60W/cm 2 、70W/cm 2 、80W/cm 2 Or any value therebetween.
The second laser baking time is 5 s-65 s, and specifically can be 5s, 10s, 16s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s, 60s, 65s or any value between them.
In an embodiment, before the first laser baking, the drying method further comprises unreeling the pole piece to provide a pole piece to be dried; and/or, the drying method further comprises pole piece winding of the obtained dry pole piece. The two ends of the pole piece are respectively wound on the unwinding unit 171 and the winding unit 172, in the baking process of the pole piece, the unwinding unit 171 and the winding unit 172 rotate simultaneously, and the pole piece to be baked is continuously released from the unwinding unit 171 and is wound on the winding unit 172 after the baking is finished. The continuous baking of the pole piece can be realized by utilizing the running fit of the unreeling unit 171 and the reeling unit 172 to carry out the conveying of the pole piece, and the whole process is automatic, so that the baking efficiency of the pole piece is greatly improved and the labor cost is reduced.
Based on the foregoing embodiment, in a specific example, the laser action area of the first laser baking is the same as the laser action area of the second laser baking, so that the time of the first laser baking is consistent with the time of the second laser baking in order not to pull the pole piece in the conveying process.
In an embodiment, after unreeling the pole piece and before the first laser baking, the drying method further comprises coating slurry on the pole piece, wherein the specific coating thickness of the slurry depends on the type of the pole piece, and the application is not limited.
In an embodiment, after the pole piece is unreeled, the drying method further comprises correcting and/or adjusting tension of the pole piece, so that accuracy of pole piece feeding (unreeling) and winding is improved, and loosening or deviation is avoided.
In a second aspect, the present application also proposes a drying system 100 for a battery pole piece 200.
Referring to fig. 2, 3 and 4, in the embodiment of the present application, the drying system 100 includes a first baking unit and a second baking unit; the first baking unit comprises a first laser heating module 110, and the first laser heating module 110 is used for performing first laser baking on the pole piece 200 to be dried; the second baking unit includes an infrared heating module 120, and the infrared heating module 120 is used for infrared baking of the pole piece 200 baked by the first laser.
According to the technical scheme, the laser heating module 110 and the infrared heating module 120 are integrated in the drying system 100, so that the problem that the existing drying system 100 cannot give consideration to the baking speed and the baking precision of the pole piece 200 is solved, and the baking efficiency and the baking quality of the pole piece 200 are comprehensively improved. The inventor has found that during the drying process of pole piece 200, pole piece 200 undergoes three kinetic stages, namely a heating stage, a constant drying rate stage, and a deceleration drying stage. The heating stage mainly comprises the steps of evaporating a solvent on the surface of the coating of the pole piece 200 and diffusing the solvent in a gas-liquid two-phase mode through an interface; when the solvent on the surface of the coating of the pole piece 200 is completely vaporized and enters a constant drying rate stage, the solvent such as NMP, water and the like in the coating of the pole piece 200 is mainly evaporated in a large amount, and in the stage, the solvent in the coating is continuously migrated to the surface due to capillary action and is enriched and evaporated on the surface, and the coating is gradually contracted, so that the time consumption of the stage is relatively long; when the moisture content in the coating of the pole piece 200 is low and reaches a critical state, the pole piece 200 enters a deceleration drying stage, the drying rate of the pole piece 200 at the stage is controlled by the migration rate of the solvent, namely by the coating particles and the gap distribution mode of the pole piece 200, and the baking temperature control precision is high in the stage. In the technical scheme of the application, in the baking process of the pole piece 200, the first laser heating module 110 can be adopted to bake the pole piece 200 for the first time, and the first laser heating module 110 can enable the temperature of the pole piece 200 to rise rapidly, so that a large amount of solvents on the surface and in the interior of the coating of the pole piece 200 are evaporated rapidly, and the time of the heating stage and the constant drying rate stage of the pole piece 200 is shortened; and then the infrared heating module 120 is adopted to bake the pole piece 200 in an infrared manner, the power adjustment precision of the infrared heating module 120 is high, the accurate adjustment and control of the temperature of the pole piece 200 in the deceleration drying stage can be realized, the situations of binder degradation, active substance deterioration and the like in the coating of the pole piece 200 caused by overlarge temperature fluctuation in the deceleration drying stage are avoided, and the baking quality of the pole piece 200 is improved. The drying system 100 of this application utilizes the characteristic that laser heating module can heat up fast earlier, take up an area of little and be convenient for adjust, carries out preliminary heating to the polar plate, adopts infrared heating module to further toast the polar plate again, and infrared heating module can finely tune the stoving temperature of polar plate, realizes the accurate control to polar plate stoving temperature for the stoving efficiency of polar plate obtains synthesizing with the stoving quality and promotes.
In some embodiments, the first baking unit further includes a first temperature detection module, the first temperature detection module is configured to detect a temperature of the pole piece 200 during the first laser baking process, the first laser heating module 110 is electrically connected to the first temperature detection module, and the power of the first laser heating module 110 is adjusted according to a detection result of the first temperature detection module. In a specific embodiment, the first temperature detection module may specifically be an infrared camera, a thermal infrared imager, a thermocouple, or a temperature sensor, and the first temperature detection module is specifically configured to detect the temperature of the coating surface of the pole piece 200 during the first laser baking process; of course, the first temperature detection module may be another type of temperature detection module, which is not limited in this application.
In the middle and later stages of the first laser baking stage, the internal and external temperatures of the coating of the pole piece 200 reach preset values, the pole piece 200 enters a constant drying rate stage, and the solvent in the coating of the pole piece 200 is evaporated gently, so that the power of the first laser heating module 110 can be reduced appropriately; according to the method, the first temperature detection module is arranged, the temperature of the coating of the pole piece 200 is monitored in real time, when the pole piece 200 enters a constant drying rate stage, the information can be fed back to the first laser heating module 110 in time, so that the power of the first laser heating module 110 is properly reduced, the baking quality of the pole piece 200 is improved, and an energy-saving effect can be achieved.
In order to further improve the control accuracy of the baking temperature in the infrared baking stage, in some embodiments, the second baking unit further includes a second temperature detection module, where the second temperature detection module is electrically connected to the infrared heating module 120, the second temperature detection module is used to detect the temperature of the pole piece 200 in the infrared baking process, and the power of the infrared heating module 120 is finely adjusted according to the detection result of the second temperature detection module. In a specific embodiment, the second temperature detection module may specifically be an infrared camera, a thermal infrared imager, a thermocouple, or a temperature sensor, and the second temperature detection module is specifically configured to detect a temperature of a coating surface of the pole piece 200 during the infrared baking process; of course, the second temperature detecting module may be another type of temperature detecting module, which is not limited in this application.
In the infrared baking process, along with the continuous promotion of the drying process, the composition of the coating of the pole piece 200 and the surrounding environment can change, and the optimal baking temperature required by the coating of the pole piece 200 can also change.
Based on the above embodiments, in some embodiments, the drying system 100 further includes a control module, where the control module is electrically connected to the first laser heating module 110, the infrared heating module 120, the first temperature detection module, and the second temperature detection module, and the control module adjusts the power of the infrared heating module 120 according to the detection result of the second temperature detection module, and adjusts the power of the first laser heating module 110 according to the detection result of the first temperature detection module.
Specifically, the control module has a first input end, a second input end, a first output end and a second output end, the output end of the first temperature detection module is electrically connected with the first input end of the control module, the first output end of the control module is electrically connected with the first laser heating module 110, the output end of the second temperature detection module is electrically connected with the second input end of the control module, and the second output end of the control module is electrically connected with the infrared heating module 120. In the first laser baking process, the first temperature detection module timely feeds back the detected temperature data of the coating surface of the pole piece 200 to the control module, and the control module timely adjusts the power of the first laser heating module 110 according to the temperature data; similarly, in the infrared baking process, the second temperature detection module timely feeds back the detected temperature data of the coating surface of the pole piece 200 to the control module, and the control module timely adjusts the power of the infrared heating module 120 according to the temperature data.
In an embodiment, the drying system 100 further includes an oven 140 and a hot air drying module 130, the light outlets of the first laser heating module 110 and the infrared heating module 120 are communicated with the interior of the oven 140, the air outlet of the hot air drying module 130 is communicated with the interior of the oven 140, and the size of the oven 140 can be adjusted according to the actual situation, which is not particularly limited in this application. In a specific embodiment, the air frequency of the hot air drying module 130 is 16-35, and may specifically be 16, 20, 25, 30, 35 or any value therebetween.
When the number of the hot air drying modules 130 is one, preferably, the hot air drying modules 130 are disposed downstream of the infrared heating modules 120, and the infrared heating modules 120 are used for further drying and dedusting the infrared baked pole pieces 200. In the later drying stage (the later stage of the deceleration drying stage) of the pole piece 200, hot air convection is adopted to dry the pole piece 200, so that solute in the pole piece coating can be prevented from migrating to the surface of the pole piece 200 coating through capillary action, and the influence on baking quality caused by migration of solute such as adhesive is further reduced. When the number of the hot air drying modules 130 is plural, the hot air drying modules 130 may be uniformly arranged along the trend of the pole piece 200, so that the air in the oven 140 is uniformly convected, and the baking uniformity and the baking rate of the pole piece 200 may be improved.
Referring to fig. 4, in some embodiments, the drying system 100 further includes a second laser heating module 150, and the second laser heating module 150 is disposed downstream of the infrared heating module 120; more specifically, the second laser heating module 150 is further located downstream of the hot air drying module 130, and the second laser heating module 150 is configured to perform a second laser baking on the pole piece 200 that is processed by the infrared baking and the hot air convection drying, where the second laser baking may transfer energy to solutes that migrate to the surface of the pole piece coating, so that the solutes migrate back into the coating of the pole piece 200, and further improve the baking quality of the pole piece 200.
Based on the above embodiment, in an embodiment, the number of the hot air drying modules 130 is plural, and the plurality of hot air drying modules 130 are respectively disposed between the first laser heating module 110, the infrared heating module 120, and the second laser heating module 150 that are disposed adjacently on the same side of the pole piece 200; for example: the number of the hot air drying modules 130 is not less than two, at least one hot air drying module 130 is disposed between the first laser heating module 110 and the infrared heating module 120, and at least one hot air drying module 130 is disposed between the infrared heating module 120 and the second laser heating module 150, and the specific number of the hot air drying modules 130 can be adjusted according to actual situations.
In a specific embodiment, the first laser heating module 110, the infrared heating module 120, the second laser heating module 150, and the plurality of hot air drying modules 130 are disposed at equal intervals along the direction of the pole piece 200.
Since the surfaces of both sides of the pole piece 200 are coated with the slurry, that is, both sides of the pole piece 200 need to be baked, in order to improve the baking efficiency and the baking uniformity, in an embodiment, referring to fig. 2, both sides of the pole piece 200 are provided with the first laser heating module 110, the infrared heating module 120 and the second laser heating module 150, so as to bake both sides (the first side and the second side) of the pole piece 200 respectively.
Correspondingly, the first temperature detection module comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is electrically connected with the first laser heating module on one side of the pole piece 200, and is used for measuring the temperature of the first side surface of the pole piece 200 in the first laser baking process, and the second temperature sensor is electrically connected with the second laser heater 112 on the other side of the pole piece 200, and is used for measuring the temperature of the second side surface of the pole piece 200 in the first laser baking process.
The second temperature detection module comprises a third temperature sensor and a fourth temperature sensor, wherein the third temperature sensor is electrically connected with an infrared heater 121 on one side of the pole piece 200, and is used for measuring the temperature of the first side surface of the pole piece 200 in the infrared baking process, and the fourth temperature sensor is electrically connected with an infrared heater 122 on the other side of the pole piece 200, and is used for measuring the temperature of the second side surface of the pole piece 200 in the infrared baking process.
Referring to fig. 4, further, the first laser heating module 110, the infrared heating module 120, and the second laser heating module 150 located on one side of the pole piece 200, and the first laser heating module 110, the infrared heating module 120, and the second laser heating module 150 located on the other side of the pole piece 200 are arranged in a staggered manner along the direction of the pole piece 200. Specifically, in the drying process of the pole piece 200, the two laser heating modules 110 sequentially bake the upper and lower surfaces of the same section of the pole piece 200, then, the two infrared heating modules 120 sequentially bake the upper and lower surfaces of the same section of the pole piece 200, then, the two second laser heating modules 150 sequentially bake the upper and lower surfaces of the same section of the pole piece 200, thereby avoiding the occurrence of the situation that the local section of the pole piece 200 is too high in baking temperature and improving the baking efficiency of the pole piece 200 on the premise of considering the baking quality of the pole piece 200.
With continued reference to fig. 2 and 3, in one embodiment, the drying system 100 further includes an unreeling unit 171 for feeding the pole piece 200 and a reeling unit 172 for reeling the pole piece 200, where the first laser heating module 110 and the infrared heating module 120 are sequentially arranged along the trend of the pole piece 200, and the first laser heating module 110 is located upstream of the infrared heating module 120. One end of the pole piece 200 is wound on the unwinding unit 171, the other end is wound on the winding unit 172, the unwinding unit 171 rotates to release the pole piece 200 in the baking process of the pole piece 200, the pole piece 200 is baked by the first laser heating module 110 and the infrared heating module 120 in sequence after being coated with the sizing agent, and after baking, the winding unit 172 rotates to wind the dried pole piece 200 on the winding unit 172.
In more detail, during the baking process of the pole piece 200, the unwinding unit 171 and the winding unit 172 are simultaneously rotated, and the pole piece 200 is continuously unwound from the unwinding unit 171 and sequentially transferred to the corresponding positions of the first laser heating module 110 and the infrared heating module 120 for baking, and is wound on the winding unit 172 after the baking is completed. By utilizing the running fit of the unreeling unit 171 and the reeling unit 172 to carry out the conveying of the pole piece 200, the continuous baking of the pole piece 200 can be realized, the whole process is automatic, the baking efficiency of the pole piece 200 is greatly improved, and the labor cost is reduced.
It may be appreciated that the drying system 100 further includes a coating module 183, the coating unit 183 is disposed between the winding unit 172 and the first laser heating module 110, after the pole piece 200 is released from the unwinding unit 171, the coating module 183 may coat slurry (coating) on the surface of the pole piece 200, and after that, the pole piece 200 is baked by the first laser heating module 110, the infrared heating module 120, the hot air drying module, and the second laser heating module 150 in sequence, and after baking, the dried pole piece 200 is wound on the winding unit 172 along with the rotation of the winding unit 172.
On the basis of the above embodiment, in an embodiment, a plurality of rollers 160 are sequentially disposed on the trend of the pole piece 200 between the unreeling unit 171 and the reeling unit 172, and during the baking process of the pole piece 200, the rollers 160 are located below the pole piece 200 and are used for supporting the pole piece 200, and the rollers 160 rotate along with the conveying of the pole piece 200.
Referring to fig. 2 and 3, in an embodiment, the drying system 100 further includes a tension adjusting unit 181 and/or a deviation rectifying unit 182, and the tension adjusting unit 181 and/or the deviation rectifying unit 182 are located downstream of the unreeling unit 171. In the pole piece drying process, the accuracy of feeding and winding the pole piece 200 is improved through the adjusting unit and/or the deviation rectifying unit 182, and the phenomenon of loosening or deviation is avoided.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (19)
1. The drying method of the battery pole piece is characterized by comprising the following steps:
carrying out primary laser baking on the pole piece to be dried;
and carrying out infrared baking on the pole piece subjected to the first laser baking to obtain a dry pole piece.
2. The drying method according to claim 1, wherein the first laser baking includes a temperature rising stage in which the power of the laser heating module of the first laser baking is adjusted to a first threshold value, and a constant temperature stage in which the power of the laser heating module of the first laser baking is adjusted down so that the temperature of the pole piece is maintained within a temperature interval of the constant temperature stage when the temperature of the pole piece reaches the temperature of the constant temperature stage.
3. The drying method according to claim 2, characterized in that the drying method comprises at least one of the following features (1) - (11):
(1) The laser wavelength of the first laser baking is 600-1080 mu m;
(2) The laser power of the first laser baking is 2000W-30000W;
(3) The laser power density of the first laser baking is 120W/cm 2 ～160W/cm 2 ；
(4) The time of the heating stage is 0.1 s-3 s;
(5) The temperature of the constant temperature stage is 125-160 ℃;
(6) The time of the first laser baking is 5 s-65 s;
(7) The infrared wavelength of the infrared baking is 1.0-1.4 mu m;
(8) The infrared power of the infrared baking is 500W-9000W;
(9) The infrared power density of the infrared baking is 160W/m 2 ～200W/m 2 ；
(10) The temperature of the infrared baking is 120-145 ℃;
(11) The infrared baking time is 5 s-30 s.
4. A drying method according to any one of claims 1 to 3, wherein after the infrared baking, the drying method further comprises the step of carrying out hot air drying treatment on the pole piece after the infrared baking, wherein the temperature of the hot air drying treatment is 70 ℃ to 110 ℃, and the fan frequency of the hot air drying treatment is 16Hz to 35Hz.
5. The drying method according to claim 4, further comprising performing a second laser baking on the hot air-dried pole piece.
6. The drying method according to claim 5, further comprising at least one of the following features (1) - (4):
(1) The laser wavelength of the second laser baking is 600-1080 mu m;
(2) The laser power of the second laser baking is 500-1500W;
(3) The laser power density of the second laser baking is 30W/cm 2 ～80W/cm 2 ；
(4) The time of the second laser baking is 5 s-65 s.
7. The drying method of claim 1, wherein prior to the first laser firing, the drying method further comprises unreeling the pole piece to provide a pole piece to be dried; and/or the number of the groups of groups,
the drying method further comprises the step of winding the pole piece of the obtained dry pole piece.
8. The drying method of claim 7, further comprising rectifying and/or tension adjusting the pole piece after unreeling the pole piece.
9. The drying method of claim 7, further comprising applying a slurry to said pole piece after unreeling said pole piece and before said first laser firing.
10. A battery pole piece drying system, comprising:
the first baking unit comprises a first laser heating module and is used for carrying out first laser baking on the pole piece to be dried;
And the second baking unit comprises an infrared heating module and is used for infrared baking of the pole piece baked by the first laser.
11. The drying system of claim 10, wherein the first baking unit further comprises a first temperature detection module, the first temperature detection module is configured to detect a temperature of the pole piece during the first laser baking process, the first laser heating module is electrically connected to the first temperature detection module, and a power of the first laser heating module is adjusted according to a detection result of the first temperature detection module; and/or the number of the groups of groups,
the second baking unit further comprises a second temperature detection module, the second temperature detection module is electrically connected with the infrared heating module, the second temperature detection module is used for detecting the temperature of the pole piece in the infrared baking process, and the power of the infrared heating module is adjusted according to the detection result of the second temperature detection module.
12. The drying system of claim 11 further comprising a control module electrically connected to the first laser heating module, the infrared heating module, the first temperature detection module, and the second temperature detection module, the control module adjusting the power of the infrared heating module based on the detection result of the second temperature detection module, and adjusting the power of the first laser heating module based on the detection result of the first temperature detection module.
13. The drying system of claim 10 further comprising an oven and a hot air drying module, wherein the light outlets of the first laser heating module and the infrared heating module are in communication with the oven interior, and wherein the air outlets of the hot air drying module are in communication with the oven interior.
14. The drying system according to any one of claims 10-13 further comprising a second laser heating module disposed downstream of the infrared heating module.
15. The drying system of claim 14, wherein the first laser heating modules, the infrared heating modules, and the second laser heating modules are disposed at equal intervals on the same side of the pole piece, and the hot air drying modules are plural in number, and the hot air drying modules are disposed between the first laser heating modules, the infrared heating modules, and the second laser heating modules disposed adjacently on the same side of the pole piece.
16. The drying system of claim 14 wherein the first laser heating module, the infrared heating module, and the second laser heating module are disposed on both sides of the pole piece, and the first laser heating module, the infrared heating module, and the second laser heating module on one side of the pole piece are disposed in a staggered manner with respect to the first laser heating module, the infrared heating module, and the second laser heating module on the other side of the pole piece along the pole piece.
17. The drying system of claim 10, further comprising an unwind unit for feeding the pole piece and a wind-up unit for winding the pole piece, wherein the first laser heating module and the infrared heating module are arranged in sequence along the trend of the pole piece, and wherein the first laser heating module is located upstream of the infrared heating module.
18. The drying system according to claim 17, further comprising a tension adjustment unit and/or a deviation correction unit, said tension adjustment unit and/or said deviation correction unit being located downstream of said unreeling unit.
19. The drying system of claim 17 further comprising a coating unit disposed on both sides of the pole piece between the unwind unit and the first laser heating module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410089104.8A CN117840004A (en) | 2024-01-22 | 2024-01-22 | Drying system and drying method for battery pole piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410089104.8A CN117840004A (en) | 2024-01-22 | 2024-01-22 | Drying system and drying method for battery pole piece |
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| CN117840004A true CN117840004A (en) | 2024-04-09 |
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| CN202410089104.8A Pending CN117840004A (en) | 2024-01-22 | 2024-01-22 | Drying system and drying method for battery pole piece |
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