CN116722097B - Current collector composite device for dry electrode production - Google Patents
Current collector composite device for dry electrode production Download PDFInfo
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- CN116722097B CN116722097B CN202310808865.XA CN202310808865A CN116722097B CN 116722097 B CN116722097 B CN 116722097B CN 202310808865 A CN202310808865 A CN 202310808865A CN 116722097 B CN116722097 B CN 116722097B
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000007731 hot pressing Methods 0.000 claims abstract description 92
- 238000013329 compounding Methods 0.000 claims abstract description 62
- 238000004804 winding Methods 0.000 claims abstract description 56
- 150000001875 compounds Chemical class 0.000 claims description 32
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 230000008676 import Effects 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 18
- 238000009736 wetting Methods 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 description 11
- 239000002390 adhesive tape Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012937 correction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000007719 peel strength test Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005507 spraying Methods 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H16/00—Unwinding, paying-out webs
- B65H16/02—Supporting web roll
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
- B65H37/04—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations for securing together articles or webs, e.g. by adhesive, stitching or stapling
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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
- H01M4/04—Processes of manufacture in general
-
- 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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/11—Dimensional aspect of article or web
- B65H2701/113—Size
- B65H2701/1133—Size of webs
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- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a current collector composite device for dry electrode production, which comprises: the current collector unreeling device is used for smoothly unreeling and conveying the reeled current collector backwards; the hot-pressing composite device is arranged behind the current collector unreeling device; the electrode film unreeling devices are arranged on the hot-pressing machine frame and symmetrically distributed relative to the hot-pressing compounding device, and are used for smoothly unreeling and conveying the electrode film to the hot-pressing compounding pair roller to be hot-pressed and compounded with the current collector; and the winding device is arranged at the rear side of the hot-pressing compounding device and is used for winding the finished product subjected to hot-pressing compounding. The invention adopts the independent unreeling and double-sided hot-pressing compounding process of the electrode film, improves the compounding efficiency and quality of the current collector and the electrode film, and can soften the adhesive layer on the surface of the current collector and improve the compounding strength between the current collector and the electrode film by wetting and preheating the front and aspects of the current collector before hot-pressing compounding.
Description
Technical Field
The invention relates to the technical field of battery production, in particular to a current collector composite device for dry electrode production.
Background
Currently, electrode tabs of batteries are mostly prepared by wet coating. The preparation method has complex process, and the volatilization of the solvent in the preparation process easily causes environmental pollution; in addition, there is a problem of solvent residue in the coated electrode. In the preparation process of the electrode plate, the solvent is recovered well, the requirement on the capacity of equipment is high, and the process cost is increased.
The electrode can also be prepared by adopting a dry process. Compared with the wet process, the dry process of the electrode is simple in process, and the problem of volatilization of the solvent is avoided; meanwhile, under the conditions of high temperature, electrolyte and the like, the electrode prepared by the dry process has better bonding performance and adhesive force, and the comprehensive performance of the battery can be further improved.
In the prior art, in order to improve thermal runaway of a battery, the industry gradually directs eyes to a composite current collector, and a common preparation method of the composite current collector is to electroplate a foil on a polymer layer or thermally compound the foil and the polymer layer, and the two methods can realize preparation of the composite current collector at present.
Chinese patent application publication No. CN116093243a discloses a current collector compounding device and a dry coater, wherein the current collector compounding device comprises: the rolling mechanism comprises two press rolls, a roll gap is formed between the two press rolls, the current collector sent out by the current collector supply mechanism and the mixed material sent out by the mixed material supply mechanism enter the roll gap respectively, the current collector and the mixed material are sequentially distributed in the roll gap along the arrangement direction of the two press rolls, and the rolling mechanism can complete the rolling of the mixed material and the compounding of the current collector in one-time rolling, so that the equipment structure and the process are simplified, and the risk of breakage easily caused by an electrode film in a single conveying process is avoided. However, in the actual production process of the current collector, the compounding of the electrode material and the current collector is finished through one-time rolling, the risk of uneven material mixing is increased, the film forming quality of the electrode film cannot be guaranteed, once the quality of the electrode film is low, the quality of the current collector is poor due to the fact that no corresponding adjusting means are arranged in the follow-up process, and the yield cannot be guaranteed. In addition, how to improve the composite strength between the current collector and the electrode film in the direct hot-pressing composite process is also a technical problem which needs to be solved in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a current collector compounding device for dry electrode production, which adopts the independent unreeling and double-sided hot-pressing compounding process of an electrode film, improves the compounding efficiency and quality of the current collector and the electrode film, and can soften an adhesive layer on the surface of the current collector and improve the compounding strength between the current collector and the electrode film by wetting and preheating the front surface and aspects of the current collector before hot-pressing compounding.
In order to achieve the above technical solution, the present invention provides a current collector composite device for dry electrode production, including: the current collector unreeling device is used for smoothly unreeling and conveying the reeled current collector backwards; the hot-pressing compound device comprises a hot-pressing rack, a pair of hot-pressing compound paired rollers which are transversely attached to each other are arranged on the hot-pressing rack, a hot-pressing compound area is formed in a paired roller attaching area of the hot-pressing compound paired rollers, a preheating bellows is arranged right above the hot-pressing compound area on the hot-pressing rack, a second import roller is arranged right above the preheating bellows, a first humidifying roller and a second humidifying roller are arranged on one side of the second import roller side by side up and down, a sprayer is arranged between the first humidifying roller and the second humidifying roller and is right opposite to the front face of a conveyed current collector, the first import roller is arranged above the first humidifying roller, and a compound export roller is arranged right below the hot-pressing compound area; the electrode film unreeling devices are arranged on the hot-pressing machine frame and symmetrically distributed relative to the hot-pressing compounding device, and are used for smoothly unreeling and conveying the electrode film to the hot-pressing compounding pair roller to be thermally and hydraulically compounded with the current collector; and the winding device is arranged at the rear side of the hot-pressing compounding device and is used for winding the finished product subjected to hot-pressing compounding.
In the technical scheme, during actual operation, the coiled current collector is placed in the current collector unreeling device, and steadily unreeled and conveyed backwards through the current collector unreeling device, the current collector enters the hot-pressing compound device through the first guide-in roller, the unreeled current collector is firstly humidified through the first humidifying roller, then is humidified through the sprayer in a spraying manner, then is humidified through the second humidifying roller for the second time, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are humidified and softened, and then conveyed into the preheating bellows for preheating, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are further softened, the viscosity of the conductive adhesive layers is activated in advance before contacting with the electrode films, meanwhile, the two electrode film unreeling devices which are symmetrically distributed on the hot-pressing compound counter roller are required to be unreeled, the electrode films which are required to be compounded are compounded in the hot-pressing compound region of the hot-pressing compound counter roller and the current collector which are humidified and preheated are subjected to double-sided compounding, so that the compact current collector compound is formed, and then is coiled through the compound guide-out roller in a hot-pressing mode, and finally the finished product is obtained through the winding device.
Preferably, the current collector unreeling device comprises an unreeling rack, a current collector unreeling roller is mounted on the unreeling rack, a current collector unreeling first guide roller is mounted at the rear of the current collector unreeling roller, an unreeling tension detector is mounted at the rear of the current collector unreeling first guide roller, a first guide roller and a second guide roller are mounted at the rear of the unreeling tension detector, a current collector unreeling tension adjusting swing roller is mounted at the rear of the second guide roller, the current collector unreeling tension adjusting swing roller is mounted on the current collector unreeling tension adjusting swing arm, a current collector unreeling tension adjusting cylinder is mounted on the unreeling rack and connected with the current collector unreeling tension adjusting swing arm, a third guide roller is mounted at the rear of the third guide roller, a spreader roller is mounted at one side of the spreader roller, a spreader roller is mounted on the spreader roller, a spreader roller pressure cylinder is mounted on the spreader roller and is connected with the rear of the unreeling rack, and a fourth guide roller is mounted at the rear of the spreader swing arm. During actual operation, the current collector rolls are placed on the current collector unreeling rollers, constant-speed unreeling is carried out through the current collector unreeling rollers, after the current collector is led out through the current collector unreeling first guide rollers, unreeling tension is detected on line through an unreeling tension detector, so that the unreeling tension of the current collector meets the requirements, current collector breakage possibly caused by overlarge unreeling tension is avoided, or current collector wrinkles possibly caused by overlarge unreeling tension are generated, the current collector after tension detection enters the current collector unreeling tension adjusting swing rollers after passing through transition of the first guide rollers and the second guide rollers, the current collector unreeling tension adjusting swing arms are adjusted through the current collector unreeling tension adjusting cylinders, the current collector after tension adjustment subsequently enters an unreeling compression region formed by the unreeling rollers and the unreeling compression rollers, the upper surface and the lower surface of the current collector are smooth, the quality of subsequent hot-pressing compounding is improved, and the current collector after unreeling finally enters the hot-pressing compounding device after passing through the current collector unreeling second guide rollers.
Preferably, a current collector unreeling deviation rectifying device is arranged between the unfolding roller and the fourth guide roller, the current collector unreeling deviation rectifying device comprises a current collector unreeling deviation rectifying roller, the current collector unreeling deviation rectifying roller is arranged between the unfolding roller and the fourth guide roller, the current collector unreeling deviation rectifying roller is arranged on a deviation rectifying swing arm, and a deviation rectifying cylinder is arranged on the unreeling rack and is connected with the deviation rectifying swing arm. During actual operation, the current collector after being stretched can be rectified through the current collector unreeling rectifying roller, and during rectification, the rectifying swing arm can be driven by the rectifying cylinder to realize the adjustment of the position and the angle of the current collector unreeling rectifying roller, so that the rectification of the current collector in the conveying process can be realized.
Preferably, the electrode film unreeling device comprises an electrode film unreeling roller, one side of the electrode film unreeling roller is provided with an electrode film unreeling first guiding roller, the rear of the electrode film unreeling first guiding roller is provided with an electrode film unreeling deviation correcting roller, an electrode film unreeling tension adjusting roller, a fifth guide roller and a sixth guide roller in sequence along the electrode film unreeling direction, the electrode film unreeling tension adjusting roller is arranged on an electrode film unreeling tension adjusting swing arm, the electrode film unreeling tension adjusting cylinder is arranged on a hot press frame and is connected with one end of the electrode film unreeling tension adjusting swing arm, and the sixth guide roller is positioned above the hot press composite counter roller. During actual operation, the electrode film rolls are placed on the electrode film unreeling roller, uniform unreeling is carried out through the electrode film unreeling roller, and after deviation correction and tension adjustment of the electrode film unreeling deviation correcting roller and the electrode film unreeling tension adjusting roller, the electrode film rolls stably enter the hot-pressing composite pair roller to be hot-pressing composite with the current collector.
Preferably, the winding device comprises a winding rack, and a winding leading-in roller, a seventh guide roller, a winding tension adjusting roller, an eighth guide roller, a ninth guide roller, a tenth guide roller, a winding leading-out roller and a winding roller are sequentially arranged on the winding rack along the winding direction. During actual operation, the current collector composite body subjected to hot-pressing compounding is subjected to stable rolling through the rolling roller after sequentially passing through the rolling leading-in roller, the seventh guide roller, the rolling tension adjusting roller, the eighth guide roller, the ninth guide roller, the tenth guide roller and the rolling leading-out roller.
Preferably, a winding tension detector is arranged between the ninth guide roller and the tenth guide roller, and winding tension can be monitored on line in real time through the winding tension detector, so that winding speed can be controlled better, and winding quality can be improved.
The current collector composite device for dry electrode production has the beneficial effects that:
1) The invention adopts the independent unreeling and double-sided hot-pressing compounding process of the electrode film, improves the compounding efficiency and quality of the current collector and the electrode film, and can soften the adhesive layer on the surface of the current collector and improve the compounding strength between the current collector and the electrode film by wetting and preheating the front and aspects of the current collector before hot-pressing compounding.
2) According to the invention, through structural design of the hot-pressing compounding device, the first humidifying roller, the second humidifying roller and the sprayer are arranged to humidify the front surface and the back surface of the current collector respectively, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are humidified and softened, then through arrangement of the preheating bellows, the humidified current collector is preheated through the preheating bellows, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are further softened, the viscosity of the conductive adhesive layers is activated in advance before the current collector contacts with the electrode film, and finally the current collector and the electrode film are subjected to double-sided hot-pressing compounding in a hot-pressing compounding region of the hot-pressing compounding pair roller, so that a compact current collector complex is formed, and the compounding strength between the current collector and the electrode film is greatly improved. The product of the heat pressing compounding area of the heat pressing compounding roller is tested, and the peeling strength between the electrode film and the current collector is 0.13N/m, while the peeling strength between the electrode film and the current collector is 0.19N/m, which is improved by 38%.
3) According to the invention, through the structural design of the current collector unreeling device, the online detection of the tension in the current collector unreeling process, the automatic adjustment of the tension, the automatic correction and the automatic extension of the upper surface and the lower surface of the current collector can be realized, the unreeling quality of the current collector is greatly improved, and the phenomena of breakage, fold and uneven and smooth surface of the current collector, which are easily caused by tension fluctuation in the current collector unreeling process, are effectively avoided.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic structural view of a current collector unreeling device of the present invention.
Fig. 3 is a schematic structural view of a hot-pressing composite device and an electrode film unreeling device of the present invention.
Fig. 4 is a schematic structural diagram of a winding device in the present invention.
In the figure: 1. a current collector unreeling device; 11. unreeling the frame; 12. a current collector unreeling roller; 13. the current collector unreels the first guiding-out roller; 14. an unreeling tension detector; 15. a first guide roller; 16. a second guide roller; 17. current collector unreeling tension adjusting swing roller; 18. current collector unreeling tension adjusting swing arm; 19. current collector unreeling tension adjusting cylinder; 110. a third guide roller; 111. stretching the press roller; 112. a spreader roll; 113. stretching a press roller swing arm; 114. stretching a compression roller pressure cylinder; 115. unreeling deviation correcting roller for current collector; 116. deviation rectifying swing arms; 117. a deviation correcting cylinder; 118. a fourth guide roller; 119. the current collector unreels a second guiding-out roller; 2. a hot-pressing compounding device; 21. a hot press frame; 22. hot-pressing and compounding the paired rollers; 23. a first introduction roller; 24. a first humidifying roller; 25. a sprayer; 26. a second humidifying roller; 27. a second introduction roller; 28. preheating a bellows; 29. a composite lead-out roller; 3. an electrode film unreeling device; 31. an electrode film unreeling roller; 32. unreeling the electrode film from a second lead-out roller; 33. unreeling the electrode film from a first lead-out roller; 34. an electrode film unreeling deviation correcting roller; 35. an electrode film unreeling tension adjusting roller; 36. a fifth guide roller; 37. an electrode film unreeling tension adjusting swing arm; 38. an electrode film unreeling tension adjusting cylinder; 39. a sixth guide roller; 4. a winding device; 41. a winding frame; 42. a winding lead-in roller; 43. a seventh guide roller; 44. a winding tension adjusting roller; 45. an eighth guide roller; 46. a ninth guide roller; 47. a winding tension detector; 48. a tenth guide roller; 49. winding and guiding out rollers; 410. and (5) a wind-up roller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.
Examples: a current collector composite device for dry electrode production.
Referring to fig. 1 to 4, a current collector composite apparatus for dry electrode production, comprising:
a current collector unreeling device 1, wherein the current collector unreeling device 1 is used for smoothly unreeling and conveying a reeled current collector backwards. The current collector unreeling device 1 comprises an unreeling rack 11, a current collector unreeling roller 12 is mounted on the unreeling rack 11, a current collector unreeling first guide roller 13 is mounted at the rear of the current collector unreeling roller 12, an unreeling tension detector 14 is mounted at the rear of the current collector unreeling first guide roller 13, the unreeling tension detector 14 is used for monitoring the tension of a current collector in the unreeling process in real time, a first guide roller 15 and a second guide roller 16 are mounted at the rear of the unreeling tension detector 14, a current collector unreeling tension adjusting swing roller 17 is mounted at the rear of the second guide roller 16, the current collector unreeling tension adjusting swing roller 17 is mounted on a current collector unreeling tension adjusting swing arm 18, a current collector unreeling tension adjusting cylinder 19 is mounted on the unreeling rack 11 and is connected with the current collector unreeling tension adjusting swing arm 18, and in actual working, the position of the current collector unreeling tension adjusting swing arm 18 is adjusted through the current collector unreeling tension adjusting cylinder 19, and thus the current collector unreeling tension adjusting swing arm 17 is adjusted; the third guide roller 110 is arranged at the rear of the current collector unreeling tension adjusting swing roller 17, the unfolding roller 112 is arranged at the rear of the third guide roller 110, the unfolding press roller 111 is arranged at one side of the unfolding roller 112, the unfolding press roller 111 is arranged on the unfolding press roller swing arm 113, the unfolding press roller pressure cylinder 114 is arranged on the unreeling frame 11 and is connected with the rear end of the unfolding press roller swing arm 113, and in actual operation, the unfolding press roller swing arm 113 is driven by the unfolding press roller pressure cylinder 114, so that the pressure between the unfolding roller 112 and the unfolding press roller 111 can be adjusted, and when the current collector enters the unfolding press region formed by the unfolding roller 112 and the unfolding press roller 111, the upper surface and the lower surface of the current collector are unfolded, and the upper surface and the lower surface of the current collector are ensured to be flat; the fourth deflector roll 118 is installed at the rear of the spreader roll 112, the second current collector unreeling guiding-out roll 119 is installed at the rear of the fourth deflector roll 118, the current collector unreeling correcting device is installed between the spreader roll 112 and the fourth deflector roll 118 and comprises a current collector unreeling correcting roll 115, the current collector unreeling correcting roll 115 is installed between the spreader roll 112 and the fourth deflector roll 118, the current collector unreeling correcting roll 115 is installed on a correcting swing arm 116, and a correcting cylinder 117 is installed on the unreeling rack 11 and is connected with the correcting swing arm 116. In actual operation, the stretched current collector can be rectified through the current collector unreeling rectifying roller 115, and the rectifying swing arm 116 can be driven by the rectifying cylinder 117 to adjust the position and angle of the current collector unreeling rectifying roller 115 during rectification, so that the rectification of the current collector in the conveying process can be realized.
In this embodiment, through the structural design of current collector unreeling device 1, can realize that the tension in the current collector unreeling process detects on line, tension automatically regulated, automatic correction and the automatic of current collector upper and lower surface are extended, very big improvement current collector unreeling quality, effectively avoided current collector unreeling the fracture that the tension fluctuation that appears easily and fold and current collector surface unevenness, smooth phenomenon. In actual operation, the current collector coil is placed on the current collector unreeling roller 12, constant-speed unreeling is carried out through the current collector unreeling roller 12, after the current collector is led out through the current collector unreeling first guide roller 13, the unreeling tension is detected on line through the unreeling tension detector 14, so that the current collector unreeling tension meets the requirements, the current collector breakage possibly caused by overlarge unreeling tension or the current collector possibly caused by overlarge unreeling tension generates wrinkles, the current collector after tension detection then enters the current collector unreeling tension adjusting swing roller 17 after passing through the transition of the first guide roller 15 and the second guide roller 16, the current collector unreeling tension adjusting swing arm 18 is adjusted through the current collector unreeling tension adjusting cylinder 19, the current collector after tension adjustment then enters the unreeling pressure region formed by the unreeling roller 112 and the unreeling compression roller 111, the upper surface and the lower surface of the current collector are smooth, the quality of the subsequent thermal compression composite is improved, the current collector after the unreeling is subsequently subjected to thermal compression and the thermal compression roller 115, and the current collector after the thermal compression is finally guided out of the thermal compression roller 119 through the current collector unreeling roller 2.
The hot pressing composite device 2 is arranged behind the current collector unreeling device 1, the hot pressing composite device 2 comprises a hot pressing rack 21, a pair of hot pressing composite pair rollers 22 which are transversely attached to each other are arranged on the hot pressing rack 1, a hot pressing composite area is formed in a pair roller attaching area of the hot pressing composite pair rollers 22, a preheating bellows 28 is arranged right above the hot pressing composite area on the hot pressing rack 21, a second leading-in roller 27 is arranged right above the preheating bellows 28, a first humidifying roller 24 and a second humidifying roller 26 are arranged on one side of the second leading-in roller 27 side by side from top to bottom, a sprayer 25 is arranged between the first humidifying roller 24 and the second humidifying roller 26 and right opposite to the front face of a conveyed current collector, a first leading-in roller 23 is arranged above the first humidifying roller 24, and a composite leading-out roller 29 is arranged right below the hot pressing composite area.
During actual operation, the current collector enters the hot-pressing composite device 2 through the first guide-in roller 23, the unreeled current collector firstly humidifies the back surface of the current collector through the first humidifying roller 24, then carries out front spray humidification through the sprayer 25, then carries out secondary humidification on the back surface of the current collector through the second humidifying roller 26, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are humidified and softened, and then is conveyed into the preheating bellows 28 for preheating, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are further softened, and the viscosity of the conductive adhesive layers is activated in advance before contacting with an electrode film.
According to the invention, through the structural design of the hot-pressing compounding device 2, the first humidifying roller 24, the second humidifying roller 26 and the sprayer 25 are arranged to respectively humidify the front surface and the back surface of the current collector, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are humidified and softened, then through the arrangement of the preheating bellows 28, the humidified current collector is preheated through the preheating bellows 28, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are further softened, the viscosity of the conductive adhesive layers is activated in advance before the current collector contacts with an electrode film, and finally the current collector and the electrode film are subjected to double-sided hot-pressing compounding in a hot-pressing compounding region of the hot-pressing compounding pair roller 22, so that a compact current collector compound is formed, and the compounding strength between the current collector and the electrode film is greatly improved.
And two electrode film unreeling devices 3 which are arranged on the hot press frame 21 and symmetrically distributed relative to the hot press compounding device 2, wherein the electrode film unreeling devices 3 are used for smoothly unreeling and conveying the electrode film to the hot press compounding pair roller 22 to be hot press compounded with a current collector. The electrode film unreeling device 3 comprises an electrode film unreeling roller 31, an electrode film unreeling first guide roller 33 is mounted on one side of the electrode film unreeling roller 31, an electrode film unreeling deviation correcting roller 34, an electrode film unreeling tension adjusting roller 35, a fifth guide roller 36 and a sixth guide roller 39 are sequentially mounted on the rear of the electrode film unreeling first guide roller 33 along the electrode film unreeling direction, the electrode film unreeling tension adjusting roller 35 is mounted on an electrode film unreeling tension adjusting swing arm 37, an electrode film unreeling tension adjusting cylinder 38 is mounted on a hot-pressing frame 21 and connected with one end of the electrode film unreeling tension adjusting swing arm 37, the sixth guide roller 39 is located above the hot-pressing compound counter roller 22, and the electrode film unreeling second guide roller 32 is mounted between the sixth guide roller 39 and the hot-pressing compound counter roller 22. In actual operation, the electrode film roll is placed on the electrode film unreeling roller 31, unreels at a constant speed through the electrode film unreeling roller 31, and after deviation correction and tension adjustment of the electrode film unreeling deviation correcting roller 34 and the electrode film unreeling tension adjusting roller 35, the electrode film roll stably enters the hot-press compounding pair roller 22 to be hot-press compounded with a current collector.
And the winding device 4 is arranged at the rear side of the hot-pressing compounding device 2, and the winding device 4 is used for winding the finished product subjected to hot-pressing compounding. The winding device 4 comprises a winding frame 41, and a winding lead-in roller 42, a seventh guide roller 43, a winding tension adjusting roller 44, an eighth guide roller 45, a ninth guide roller 46, a tenth guide roller 48, a winding lead-out roller 49 and a winding roller 410 are sequentially arranged on the winding frame 41 along the winding direction. In actual operation, the current collector composite after hot-pressing and compounding is stably wound by the winding roller 410 after passing through the winding inlet roller 42, the seventh guide roller 43, the winding tension adjusting roller 44, the eighth guide roller 45, the ninth guide roller 46, the tenth guide roller 48 and the winding outlet roller 49 in sequence. A winding tension detector 47 is arranged between the ninth guide roller 46 and the tenth guide roller 48, and winding tension can be monitored on line in real time through the winding tension detector 47, so that winding speed can be controlled better, and winding quality can be improved.
The invention adopts the independent unreeling and double-sided hot-pressing compounding process of the electrode film, improves the compounding efficiency and quality of the current collector and the electrode film, and can soften the adhesive layer on the surface of the current collector and improve the compounding strength between the current collector and the electrode film by wetting and preheating the front and aspects of the current collector before hot-pressing compounding. In actual operation, the coiled current collector is placed in the current collector uncoiling device 1, and steadily uncoiled and conveyed backwards through the current collector uncoiling device 1, the current collector enters the hot-pressing compound device 2 through the first lead-in roller 23, the uncoiled current collector firstly wets the back surface of the current collector through the first humidifying roller 24, then carries out front-surface spray humidification through the sprayer 25, then carries out secondary humidification on the back surface of the current collector through the second humidifying roller 26, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are humidified and softened, then is conveyed into the preheating bellows 28 for preheating, so that the conductive adhesive layers on the upper surface and the lower surface of the current collector are further softened, the viscosity of the conductive adhesive layers is activated in advance before contacting with the electrode films, meanwhile, the two electrode film uncoiling devices 3 which are installed on the hot-pressing compound counter roller 21 and symmetrically distributed with respect to the hot-pressing compound counter roller 22 are coiled, the electrode films which need to be compounded are coiled, the hot-pressing compound counter roller 22 and the humidified current collector is compounded in the hot-pressing compound region, the hot-pressing compound counter roller 22 is carried out of the compact current collector, and then the compact current collector composite is led out through the hot-pressing compound counter roller 29, and finally the finished product is coiled through the hot-pressing compound roller 4, and the current collector 4 is obtained.
Peel strength test
Test instrument: wenzhou three and measuring instruments limited SBL-90 peel force test machine.
The testing method comprises the following steps: the adhesive tape is peeled off, 3-5 layers outside the adhesive tape are cut off, the adhesive tape is uniformly peeled off, the adhesive tape is adhered to one end of a tested pole piece, the included angle between the adhesive tape and the pole piece is larger than 30 degrees, a polyester film with the length of about 200mm and the width of 40mm is placed below the other end of the pole piece, then a sample is rolled back and forth for 3 times at the speed of about 120mm/s under the dead weight by using a wheel of a rolling device, the free end of the sample is folded through 180 degrees, the adhesive surface is peeled off by about 10mm, the pole piece is clamped on a lower clamp, and the free end of the sample is clamped on an upper clamp. The stripping surface is kept consistent with the tester force line. The tester continuously peeled at a falling rate of 300.+ -.10 mm/min. The effective peel adhesion length was about 100mm and there were automated technical means to give peel strength and peel force data.
The above test experiments were each averaged after 5 times. The experimental results of comparative example 1 (the product obtained by directly compounding the current collector and the electrode film in the hot-press compounding zone of the hot-press compounding counter roller without humidification and preheating treatment) of the current collector composite finished product prepared in example 1 of the present invention are shown in table 1:
TABLE 1 peel strength test results
| 1 | 2 | 3 | 4 | 5 | average/N/m | |
| This embodiment | 0.18 | 0.19 | 0.19 | 0.19 | 0.20 | 0.19 |
| Comparative example 1 | 0.13 | 0.13 | 0.12 | 0.13 | 0.13 | 0.13 |
From the test results, it can be seen that the peeling strength between the electrode film and the current collector is 0.13N/m, and the peeling strength between the electrode film and the current collector is 0.19N/m, which is improved by 38%. The experimental results can clearly show that the electrode film and the current collector are correspondingly humidified and preheated between the hot-pressing compounding, and the compounding strength between the current collector and the electrode film can be greatly improved.
The foregoing is a preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, so that the equivalents and modifications can be made without departing from the spirit of the disclosure.
Claims (6)
1. A current collector composite device for dry electrode production, comprising:
the current collector unreeling device is used for smoothly unreeling and conveying the reeled current collector backwards;
the hot-pressing compound device comprises a hot-pressing rack, a pair of hot-pressing compound paired rollers which are transversely attached to each other are arranged on the hot-pressing rack, a hot-pressing compound area is formed in a paired roller attaching area of the hot-pressing compound paired rollers, a preheating bellows is arranged right above the hot-pressing compound area on the hot-pressing rack, a second import roller is arranged right above the preheating bellows, a first humidifying roller and a second humidifying roller are arranged on one side of the second import roller side by side up and down, a sprayer is arranged between the first humidifying roller and the second humidifying roller and is right opposite to the front face of a conveyed current collector, the first import roller is arranged above the first humidifying roller, and a compound export roller is arranged right below the hot-pressing compound area;
the electrode film unreeling devices are arranged on the hot-pressing machine frame and symmetrically distributed relative to the hot-pressing compounding device, and are used for smoothly unreeling and conveying the electrode film to the hot-pressing compounding pair roller to be thermally and hydraulically compounded with the current collector;
and the winding device is arranged at the rear side of the hot-pressing compounding device and is used for winding the finished product subjected to hot-pressing compounding.
2. The collector composite device for dry electrode production according to claim 1, wherein the collector unwinding device comprises an unwinding frame, a collector unwinding roller is mounted on the unwinding frame, a collector unwinding first guide roller is mounted at the rear of the collector unwinding roller, an unwinding tension detector is mounted at the rear of the collector unwinding first guide roller, a first guide roller and a second guide roller are mounted at the rear of the unwinding tension detector, a collector unwinding tension adjusting swing roller is mounted at the rear of the second guide roller, a collector unwinding tension adjusting swing roller is mounted on a collector unwinding tension adjusting swing arm, a collector unwinding tension adjusting cylinder is mounted on the unwinding frame and connected with the collector unwinding tension adjusting swing arm, a third guide roller is mounted at the rear of the collector unwinding tension adjusting swing roller, a unwinding compression roller is mounted at the rear of the third guide roller, a unwinding compression roller is mounted at one side of the unwinding roller, a compression roller is mounted on the unwinding compression roller, a fourth guide roller is mounted at the rear of the unwinding roller, and is connected with the fourth guide roller, and a unwinding compression roller is mounted at the rear of the fourth guide roller.
3. The current collector composite device for dry electrode production according to claim 2, wherein a current collector unreeling deviation rectifying device is installed between the unreeling roller and the fourth guide roller, the current collector unreeling deviation rectifying device comprises a current collector unreeling deviation rectifying roller, the current collector unreeling deviation rectifying roller is installed between the unreeling roller and the fourth guide roller, the current collector unreeling deviation rectifying roller is installed on a deviation rectifying swing arm, and a deviation rectifying cylinder is installed on an unreeling rack and connected with the deviation rectifying swing arm.
4. The current collector composite device for dry electrode production according to claim 1, wherein the electrode film unreeling device comprises an electrode film unreeling roller, a first electrode film unreeling guide roller is installed on one side of the electrode film unreeling roller, an electrode film unreeling deviation correcting roller, an electrode film unreeling tension adjusting roller, a fifth guide roller and a sixth guide roller are sequentially installed at the rear of the first electrode film unreeling guide roller along the electrode film unreeling direction, the electrode film unreeling tension adjusting roller is installed on an electrode film unreeling tension adjusting swing arm, the electrode film unreeling tension adjusting cylinder is installed on a hot-pressing frame and connected with one end of the electrode film unreeling tension adjusting swing arm, and the sixth guide roller is located above the hot-pressing composite counter roller.
5. The current collector composite device for dry electrode production according to claim 1, wherein the winding device comprises a winding frame, and a winding lead-in roller, a seventh guide roller, a winding tension adjusting roller, an eighth guide roller, a ninth guide roller, a tenth guide roller, a winding lead-out roller and a winding roller are sequentially installed on the winding frame along a winding direction.
6. The current collector composite device for dry electrode production according to claim 5, wherein a winding tension detector is installed between the ninth guide roller and the tenth guide roller.
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| JP2015229741A (en) * | 2014-06-06 | 2015-12-21 | 日本ゼオン株式会社 | Electrochemical element electrode conductive adhesive composition, current collector with adhesive layer, and electrochemical element electrode |
| CN113611825A (en) * | 2021-08-06 | 2021-11-05 | 中汽创智科技有限公司 | Preparation process of lithium battery electrode piece |
| CN113611814A (en) * | 2021-08-05 | 2021-11-05 | 南京航空航天大学 | Preparation method of battery dry-method pole piece |
| CN113675362A (en) * | 2021-08-18 | 2021-11-19 | 蜂巢能源科技有限公司 | Method and system for preparing electrode slice by dry method and application |
| CN115148947A (en) * | 2022-08-08 | 2022-10-04 | 惠州市赢合科技有限公司 | Production system and production method for dry coating pressed pole piece |
| CN116093243A (en) * | 2022-12-30 | 2023-05-09 | 广东利元亨智能装备股份有限公司 | Current collector composite device and dry coating machine |
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| JP2015229741A (en) * | 2014-06-06 | 2015-12-21 | 日本ゼオン株式会社 | Electrochemical element electrode conductive adhesive composition, current collector with adhesive layer, and electrochemical element electrode |
| CN113611814A (en) * | 2021-08-05 | 2021-11-05 | 南京航空航天大学 | Preparation method of battery dry-method pole piece |
| CN113611825A (en) * | 2021-08-06 | 2021-11-05 | 中汽创智科技有限公司 | Preparation process of lithium battery electrode piece |
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