WO2011108561A1 - 電極製造装置 - Google Patents
電極製造装置 Download PDFInfo
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- WO2011108561A1 WO2011108561A1 PCT/JP2011/054687 JP2011054687W WO2011108561A1 WO 2011108561 A1 WO2011108561 A1 WO 2011108561A1 JP 2011054687 W JP2011054687 W JP 2011054687W WO 2011108561 A1 WO2011108561 A1 WO 2011108561A1
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- electrode slurry
- electrode
- slurry
- unit
- storage tank
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- 239000011267 electrode slurry Substances 0.000 claims abstract description 118
- 239000011362 coarse particle Substances 0.000 claims abstract description 61
- 238000003860 storage Methods 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000013530 defoamer Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 abstract description 8
- 238000004220 aggregation Methods 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 208000028659 discharge Diseases 0.000 description 16
- 230000007547 defect Effects 0.000 description 8
- 239000002904 solvent Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- H01M4/0402—Methods of deposition of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
- B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
-
- 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
-
- 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
Definitions
- the present invention relates to an electrode manufacturing apparatus.
- This application claims priority based on Japanese Patent Application No. 2010-047049 filed in Japan on Mar. 3, 2010, the contents of which are incorporated herein by reference.
- an electrode of a secondary battery or the like is a die head from an electrode slurry obtained by mixing a plurality of materials (electrode active material, binder, solvent, etc.) to a current collector made of aluminum or copper as a base material. It is manufactured by applying the electrode slurry and drying the applied electrode slurry.
- the present invention has been made in view of such circumstances, and its purpose is to provide an electrode manufacturing apparatus that can efficiently remove coarse particles and bubbles contained in an electrode slurry and suppress electrode defects. It is to provide.
- an electrode manufacturing apparatus includes a manufacturing unit that manufactures an electrode slurry by mixing a plurality of materials, a storage tank that is connected to the manufacturing unit and stores the manufactured electrode slurry, and the storage tank
- the storage tank is connected to a coarse particle removal filter for removing coarse particles of the stored electrode slurry, and the storage tank is connected to the coarse particle removal filter to remove bubbles in the electrode slurry from which the coarse particles have been removed.
- the electrode slurry is transferred from the manufacturing unit to the storage tank or stored in the storage tank.
- the bubbles generated during replacement of this coarse particle removal filter are also removed by a defoamer and returned to the storage tank. Therefore, the stored electrode slurry is an electrode slurry having an excellent property containing almost no bubbles and coarse particles.
- the electrode slurry is circulated to remove the bubbles and coarse particles continuously and repeatedly, so that an electrode slurry having excellent properties containing almost no bubbles and coarse particles can be applied to the substrate. And electrode defects such as voids and dropout can be suppressed.
- the electrode manufacturing apparatus it is possible to efficiently remove coarse particles and bubbles contained in an electrode slurry applied to a substrate for manufacturing an electrode, and to suppress electrode defects.
- FIG. 1 is a schematic configuration diagram of an electrode manufacturing apparatus 1 according to an embodiment of the present invention.
- FIG. 1 is a schematic configuration diagram of an electrode manufacturing apparatus 1 according to an embodiment of the present invention. First, the basic configuration of the electrode manufacturing apparatus 1 will be described. As shown in FIG. 1, the electrode manufacturing apparatus 1 includes a manufacturing unit 10, a storage unit 20, and a coating unit 30.
- the manufacturing unit 10 mixes an electrode active material, a conductive material, a binder, and a solvent to form a slurry, and manufactures an electrode slurry S.
- the manufacturing unit 10 includes a mixing tank 11 and a vacuum pump 12, and the electrode slurry S manufactured in the mixing tank 11 is vacuum degassed by the vacuum pump 12.
- the storage unit 20 is connected to the manufacturing unit 10 and the coating unit 30, stores or stores the electrode slurry S, and includes a primary storage tank 21 and a feed tank 22 as storage tanks.
- the primary storage tank 21 is connected to the mixing tank 11 via the conduit 13 and the pump 14, and stores the electrode slurry S transferred from the mixing tank 11.
- the feed tank 22 is smaller (for example, 10 liters) than the primary storage tank 21 (for example, 100 liters).
- the feed tank 22 is connected to the primary storage tank 21 via a pipe line 23, a pump 24, and a valve 25, and the electrode slurry S is transferred from the primary storage tank 21.
- the electrode slurry S transferred and stored in the feed tank 22 is applied to the substrate M by a coating unit 30 including a coating head (such as a die head) described later.
- the feed tank 22 is provided with a liquid level sensor 26 that detects the liquid level in the feed tank 22 and is controlled so that the liquid level of the electrode slurry S falls within a predetermined range.
- a control unit controls the operation / stop of the pump 24 and the opening / closing of the valve 25 based on the detection result of the liquid level sensor 26, and the electrode in the feed tank 22 is applied by coating.
- the electrode slurry S containing coarse particles or bubbles produced by the production unit 10 is appropriately supplemented via the primary storage tank 21 and controlled so as to be within a predetermined range. ing.
- the electrode slurry S is transferred from the primary storage tank 21 to the feed tank 22 in a state where supply of the electrode slurry S in the feed tank 22 to a coating unit to be described later is stopped. Then, after the electrode slurry S in the feed tank 22 is circulated for a certain period in a circulation system described later, supply to the coating unit 30 is started.
- the coating unit 30 is for applying the electrode slurry S to the base material M and then drying it.
- the transport unit 31, a drying device (not shown), a film thickness sensor 32, and a coating head 33 are provided. It has.
- the conveyance device 31 includes two conveyance rolls 31a and 31b, and conveys the sheet-like substrate M in one direction between the conveyance rolls 31a and 31b.
- the drying device (not shown) dries the electrode slurry S applied to the substrate M to form an electrode film on the surface of the substrate M.
- the film thickness sensor 32 is provided on the side of the transport roll 31b that winds up the base material M, and detects the thickness of the electrode film with light.
- the coating head 33 is provided on the side of the transport roll 31 a that feeds the substrate M, and applies the electrode slurry S to the substrate M.
- the coating head 33 is connected to the feed tank 22 via a pipe line 34 and a pump 35.
- the discharge amount of the electrode slurry S is controlled so that the thickness of the electrode film after drying becomes a predetermined thickness.
- the control unit (not shown) controls the discharge amount of the electrode slurry S by controlling the flow rate of the pump 35 based on the detection result of the film thickness sensor 32.
- the electrode manufacturing apparatus 1 having the above basic configuration includes a circulation system 50.
- the circulation system 50 is provided in the feed tank 22 of the storage unit 20 and circulates the electrode slurry S stored in the feed tank 22.
- the circulation system 50 includes a pipe line 51, a pump 52, a filter unit 53, a centrifugal deaerator 54, and a sub circulation unit 55.
- coarse particles and bubbles are removed more as the electrode slurry S stored in the feed tank 22 circulates in the circulation system including the feed tank 22, the filter unit 53, and the centrifugal deaerator 54. An electrode slurry having good properties can be obtained.
- the electrode slurry S stored in the feed tank 22 is applied for a certain period (for example, 30 minutes), that is, substantially a plurality of times after passing through this circulation system, thereby producing a high-quality electrode. be able to.
- the number of times the electrode slurry S is passed through the circulation system can be changed according to the design, and in some cases, the circulation system may be passed only once.
- the circulation of the circulation system may be stopped for coating, or the coating may be performed while passing through the circulation system. This is because if the circulation is performed at least as many times as required in the design, a slurry having a property that is designed or superior to the design can be applied by the coating unit 30.
- the pipe 51 includes a pipe 51 a that connects the upstream opening 22 a disposed near the bottom surface of the feed tank 22 and the pump 52, a pipe 51 b that connects the pump 52 and the filter unit 53, and a filter unit 53.
- 51c is connected to the centrifugal deaerator 54, and the downstream opening 22b is disposed at the upper position relatively far from the bottom of the wall surface of the centrifugal deaerator 54 and the feed tank 22. 51d.
- the upstream opening 22a opens at the bottom of the feed tank 22 as described above.
- the downstream opening 22b opens below the liquid level (predetermined range) of the stored electrode slurry S in the inner wall portion of the feed tank 22.
- the electrode slurry S that has passed through the circulation system 50 is returned to the feed tank 22, it is sufficient that no new bubbles are generated by hitting the liquid surface of the stored electrode slurry S.
- a pipe arranged so that one opening is connected to the downstream opening 22 b and the other opening is lower than the liquid level of the electrode slurry S in which the other opening is stored is provided inside the feed tank 22. .
- the filter unit 53 includes two coarse particle removal filters 53A and 53B arranged in parallel, and four switching units arranged upstream and downstream of the two coarse particle removal filters 53A and 53B, respectively. And valves 53a to 53d.
- the circulation system 50 can be formed through only one of the two coarse particle removal filters 53A and 53B.
- the switching unit immediately switches to the coarse particle removal filter 53B and circulates. Since the flow of the system 50 can be continued, productivity can be improved. In this case, the coarse particle removal filter 53A is replaced after the switching.
- the switching unit may be automatically controlled to be switched after a lapse of a certain time by a control unit (not shown).
- the coarse particle removal filters 53A and 53B are made of a mesh filter, and capture coarse particles contained in the electrode slurry S.
- the slot width of the die head is generally 200 to 500 ⁇ m, so that coarse particles can be sufficiently captured by setting the mesh filter aperture to about 150 ⁇ m.
- the centrifugal deaerator 54 rotates to apply a centrifugal force to the electrode slurry S, and defoams by this centrifugal force. More specifically, the centrifugal defoamer 54 collects bubbles having a lighter specific gravity than the electrode slurry S on the center side of the rotation, and discharges the foam phase from the center side discharge portion that opens to the center side. The liquid phase is discharged from the outer peripheral discharge portion that opens to the side. Defoaming is performed so that there is about one bubble per about 10 milliliters of electrode slurry, preferably about one bubble per about 100 milliliters.
- the rotation speed of the centrifugal deaerator 54 is such that the electrode active material contained in the electrode slurry S, the solvent, and the binder are not separated by centrifugal force.
- the auxiliary circulation part 55 puts the electrode slurry S containing the bubbles discharged from the central discharge part of the centrifugal deaerator 54 into the recovery tank 55a to recover the bubbles, and the electrode slurry S from which the bubbles have been recovered is piped. Return to path 51c.
- the electrode active material, the binder, and the solvent are mixed to produce the electrode slurry S.
- bubbles mixed in the electrode slurry S by mixing are vacuum degassed by the vacuum pump 12.
- the amount of the solvent at the time of the above mixing is an amount in consideration of air stagnation due to vacuum degassing.
- the electrode slurry S in the mixing tank 11 is transferred to the primary storage tank 21 via the conduit 13 and the pump 14. In this transfer, bubbles are slightly mixed into the electrode slurry S.
- the electrode slurry S in which bubbles are slightly mixed is stored in the primary storage tank 21. During this storage, aggregation proceeds with time, and coarse particles are generated in the electrode slurry S. Further, bubbles are mixed into the electrode slurry S due to external vibration or the like.
- the control unit controls the operation / stop of the pump 24 and the opening / closing of the valve 25 to control the feed tank 22 from the primary storage tank 21.
- the electrode slurry S is transferred to Even in this transfer, bubbles are slightly mixed into the electrode slurry S.
- the electrode slurry S in which bubbles are mixed and coarse particles are contained is temporarily stored in the feed tank 22.
- the electrode slurry S once stored in the feed tank 22 in this way flows into the pipeline 51a from the upstream opening 22a, and passes through one of the coarse particle removal filters 53A and 53B of the filter unit 53 via the pump 52. pass. During this passage, the coarse particle removal filter 53A or the coarse particle removal filter 53B captures the coarse particles generated in the primary storage tank 21.
- the electrode slurry S from which coarse particles have been removed by the filter unit 53 flows into the centrifugal deaerator 54.
- the centrifugal defoamer 54 collects and separates the bubbles contained in the electrode slurry S in the center, and discharges the foam phase from the central discharge section and discharges the liquid phase from the outer discharge section.
- the electrode slurry S discharged from the center-side discharge portion is collected in the recovery tank 55a, then returned to the pipe 51c, and flows into the centrifugal deaerator 54 again.
- the electrode slurry S discharged from the outer peripheral side discharge portion of the centrifugal defoamer 54 and from which bubbles have been removed flows again into the feed tank 22 from the downstream opening 22b via the conduit 51d. In this way, the electrode slurry S continuously circulates in the circulation system 50, whereby coarse particles and bubbles are almost removed, and the properties of the electrode slurry S are recovered.
- the electrode slurry S whose properties have been recovered is supplied to the coating unit 30 and applied to the substrate M.
- the applied electrode slurry S contains almost no coarse particles and bubbles, and almost no electrode defects occur.
- the discharge amount of the electrode slurry S from the coating head 33 is strictly controlled. That is, the liquid level of the feed tank 22 is controlled within a predetermined range, the fluctuation range of the head pressure is limited, and the circulation system 50 is provided independently of the pipe line 34 and the pump 35.
- the discharge amount of the electrode slurry S of the coating head 33 is strictly controlled through the flow rate control of the pump 35. By such strict control, an electrode having a uniform electrode film thickness can be obtained.
- the circulation system 50 including the coarse particle removal filters 53 ⁇ / b> A and 53 ⁇ / b> B and the centrifugal deaerator 54 is provided in the storage unit 20. Even if air bubbles are mixed into the electrode slurry S during transfer to the tank 21, during transfer from the primary storage tank 21 to the feed tank 22, or during storage in the primary storage tank 21, the centrifugal deaerator 54 Bubbles can be removed. Further, even when coarse particles are generated during storage in the primary storage tank 21 of the electrode slurry S, the coarse particles can be removed by the coarse particle removal filters 53A and 53B. As a result, the electrode slurry S is circulated to remove the bubbles and coarse particles continuously and repeatedly. Therefore, it is possible to apply the electrode slurry S having an excellent property containing almost no bubbles and coarse particles to the substrate M. It is possible to suppress electrode defects such as streaks, voids and dropouts.
- examples of the defoamer include a vacuum vacuum defoamer, an ultrasonic defoamer, and a centrifugal defoamer.
- the solvent of the electrode slurry S may be scattered.
- the ultrasonic deaerator the temperature of the electrode slurry S may increase. If the solvent is diffused, the coating may be affected, and the temperature increase of the electrode slurry may change the properties of the electrode slurry, which is a chemical substance. Therefore, a centrifugal defoamer with less of these effects and possibilities is desirable. For this reason, the electrode manufacturing apparatus 1 of this embodiment employs a centrifugal deaerator.
- apparatuses other than the centrifugal deaerator can be used as long as they do not affect the properties of the electrode slurry to be applied.
- the continuous operation time of a coating process can be lengthened and production capacity can be improved. That is, simply, when a coarse particle removal filter is provided in the pipeline 34 for supplying the electrode slurry S from the storage unit 20 to the coating unit 30, the coating must be stopped during maintenance, Production capacity decreases. Further, even if a coarse particle removal filter is provided in parallel at the same place and the switching operation is performed, the valve 34 in the pipeline 34 and the priming water are switched at the time of the filter switching even if the coating is continuously performed during the maintenance.
- the electrode manufacturing apparatus 1 of the present embodiment since the circulation system 50 is provided in the feed tank 22 independently of the pipe line 34, it is necessary to stop the coating even during the maintenance of the filter unit 53. Therefore, the continuous operation time can be extended and the production capacity can be improved. Furthermore, according to the electrode manufacturing apparatus 1 of the present embodiment, since the circulation system 50 is provided in the feed tank 22 independently of the pipe line 34, the strict discharge amount control of the coating unit 30 is affected. The film quality can be kept constant.
- the electrode manufacturing apparatus 1 of the present embodiment since the coarse particles and the bubbles are directly removed in the feed tank immediately before the coating process for actually manufacturing the electrode, the effectiveness is high.
- the plurality of coarse particle removal filters 53A and 53B can be switched, circulation of the stored electrode slurry S can be continued even during maintenance such as cleaning, and bubbles and coarse particles are always removed. be able to. Thereby, the electrode slurry S having excellent properties can be applied to the base material M at all times.
- the centrifugal deaerator 54 is provided on the downstream side of the coarse particle removal filters 53A and 53B, the electrode slurry S containing bubbles mixed in when passing through the coarse particle removal filters 53A and 53B immediately after cleaning is provided. At the stage before returning to the feed tank 22 again, the bubbles can be removed, and workability and operability can be improved.
- the electrode slurry S containing the removed bubbles can be used effectively without being discarded.
- the circulation system 50 is provided in the feed tank 22 in which the liquid level is controlled, it is easy to adjust so that bubbles and the like are not mixed when returning the electrode slurry S that has been defoamed and coarsely removed to the feed tank 22 It is. For this reason, the electrode slurry S having excellent properties through the circulation system 50 can be applied to the base material M.
- the manufacturing unit 10 is configured to perform vacuum defoaming, but the bubble removal may be performed only by the centrifugal defoamer 54 without performing vacuum defoaming.
- the electrode manufacturing apparatus it is possible to efficiently remove coarse particles and bubbles contained in an electrode slurry applied to a substrate for manufacturing an electrode, and to suppress electrode defects.
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Abstract
Description
本願は、2010年3月3日に日本出願された特願2010-047049に基づいて優先権を主張し、その内容をここに援用する。
また、真空脱泡器を塗工工程におけるフィード系に組み込むと、フィード系全体が減圧されることでダイヘッドでの流量変動が大きくなり、均一な膜厚でスラリを集電体に塗布することが困難であるため、真空脱泡を行う際は塗工を停止しなければならなかった。
さらに、フィード系にフィルタを組み込むと、粗粒で目詰まりしたフィルタを交換するとき再び気泡を巻き込んでしまうため、結局、気泡を含む電極スラリが集電体に塗布されて電極欠陥が生じてしまうという問題があった。
すなわち、本発明に係る電極製造装置は、複数の材料を混合して電極スラリを製造する製造部と、前記製造部に接続され、前記製造された電極スラリを貯留する貯留タンクと、前記貯留タンクに接続され、前記貯留された電極スラリの粗粒を除去する粗粒除去フィルタと、前記粗粒除去フィルタに接続され、前記粗粒が除去された電極スラリの気泡を除去して、前記貯留タンクに貯留された電極スラリの液位よりも下方に前記気泡が除去された電極スラリを戻す脱泡器と、前記貯留タンクに接続され、前記貯留された電極スラリを基材に塗布する塗工部と、を有する。
この構成によれば、粗粒除去フィルタと脱泡器とを有する循環系が貯留タンクに設けられているので、製造部から電極スラリを貯留タンクに移送する際あるいは貯留タンクに貯留している際に混入した気泡および貯留時に生成された粗粒を除去できるのみならず、この粗粒除去フィルタの交換時に発生する気泡も脱泡器により除去して貯留タンクに戻す(戻す際には気泡が新たに発生しないよう、貯蔵された電極スラリの液位よりも下方に戻される)ので、貯留された電極スラリは気泡と粗粒とが殆ど含まれない優れた性状の電極スラリとなる。
これらにより、電極スラリを循環させて気泡と粗粒とを連続的かつ繰り返し除去するので、気泡と粗粒とが殆ど含まれない優れた性状の電極スラリを基材に塗布することができ、スジや空隙、脱落等の電極欠陥を抑制することができる。
図1は、本発明の実施形態に係る電極製造装置1の概略構成図である。
まず、電極製造装置1の基本構成について説明する。図1に示すように、電極製造装置1は、製造部10と、貯蔵部20と、塗工部30とを備えている。
一次貯蔵タンク21は、管路13とポンプ14とを介して、混合タンク11と接続されており、混合タンク11から移送された電極スラリSを貯蔵する。
このフィードタンク22には、フィードタンク22内の液位を検出する液位センサ26が設けられており、電極スラリSの液位が所定の範囲になるように制御されている。具体的には、制御部(不図示)が、液位センサ26の検出結果に基づいて、ポンプ24の稼働・停止及び弁25の開・閉を制御し、塗工によりフィードタンク22内の電極スラリSの液位が低くなった場合には、一次貯蔵タンク21を介して製造部10で製造された粗粒または気泡を含む電極スラリSを適宜補充し、所定の範囲になるように制御されている。
なお、上記補充の際、一次貯蔵タンク21からフィードタンク22への電極スラリSの移送は、フィードタンク22内の電極スラリSの後述の塗工部への供給を停止した状態で行う。そして、フィードタンク22内の電極スラリSを後述の循環系で一定期間循環させた後、塗工部30へ供給を開始する。
搬送装置31は、二つの搬送ロール31a,31bを備えており、これら搬送ロール31a,31b間でシート状の基材Mを一方向に搬送する。
乾燥装置(不図示)は、基材Mに塗布された電極スラリSを乾燥させて基材Mの表面上に電極膜を形成する。
膜厚センサ32は、基材Mを巻き取る搬送ロール31b側に設けられており、電極膜の厚さを光で検出する。
この塗工ヘッド33は、乾燥後の電極膜の厚さが所定の厚みとなるように、電極スラリSの吐出量が制御されている。具体的には、制御部(不図示)が、膜厚センサ32の検出結果に基づいて、ポンプ35の流量を制御して、電極スラリSの吐出量を制御している。
循環系50は、貯蔵部20のフィードタンク22に設けられており、フィードタンク22に貯蔵された電極スラリSを循環させる。この循環系50は、管路51と、ポンプ52と、フィルタ部53と、遠心脱泡器54と、副循環部55とを有している。
この循環系50のうち、フィードタンク22、フィルタ部53および遠心脱泡器54とからなる循環系を、フィードタンク22に貯留された電極スラリSが循環すればするほど粗粒や気泡がより除去された性状のよい電極スラリとすることができる。このため、フィードタンク22に貯留された電極スラリSを一定期間(例えば30分間)、すなわち実質的に複数回、この循環系に通した後に塗工を行うことで、品質のよい電極を製造することができる。もちろん、この循環系に電極スラリSを通す回数は設計に応じて変更可能であり、場合によっては約1回だけ循環系を通すとしてもよい。
また、一定期間循環系を通した後、循環系の循環を止めて塗工をしてもよいし、循環系を通しつつ塗工をしてもよい。少なくとも設計で求められる回数だけ循環がなされていれば、設計された性状または設計より優れた性状のスラリを塗工部30で塗工することができるからである。
なお、上流開口22aは、上述のとおりフィードタンク22の底部に開口している。一方、下流開口22bは、フィードタンク22の内側壁部のうち貯留された電極スラリSの液位(所定の範囲)よりも下方に開口している。
ただし、上記循環系50を経た電極スラリSがフィードタンク22に戻される際に、貯留された電極スラリSの液面に当たって新たな気泡が発生しなければよいので、下流開口22bはフィードタンク22の内側壁部のうち貯留された電極スラリSの液位よりも上方に開口していてもよい。この場合には、例えば、一方の開口が下流開口22bと接続され、他方の開口が貯留された電極スラリSの液位よりも下方となるよう配置された管がフィードタンク22の内部に設けられる。
上記切替部は、図示しない制御部により一定時間経過後に自動的に切り替え制御されてもよい。
なお、この遠心脱泡器54の回転数は、電極スラリSに含まれる電極活物質と、溶媒及び結着剤とが、遠心力によって分離しない程度の回転数が用いられる。
まず、混合タンク11において、電極活物質と結着剤と溶媒を混合して電極スラリSを製造する。この際、混合によって電極スラリSに混入した気泡を、真空ポンプ12によって真空脱泡する。なお、上記の混合時の溶媒の量は、真空脱泡による気散を考慮した量となっている。
また、外部振動等によって、電極スラリSに気泡が混入する。
そして、気泡が混入し、粗粒が含まれるようになった電極スラリSは、フィードタンク22に一旦貯留される。
遠心脱泡器54は、電極スラリSに含まれる気泡を中央に集めて分離し、泡相を中心側排出部から、液相を外周側排出部から排出する。
中心側排出部から排出された電極スラリSは、回収タンク55aに集められた後に、管路51cに戻され、遠心脱泡器54に再度流入する。
一方、遠心脱泡器54の外周側排出部から排出され、気泡が除去された電極スラリSは、管路51dを介して下流開口22bからフィードタンク22に再流入する。
このようにして、電極スラリSが循環系50を連続して循環することにより、粗粒と気泡とが殆ど除去され、電極スラリSの性状が回復する。
また、この電極スラリSを基材Mに塗布する際には、塗工ヘッド33からの電極スラリSの吐出量が厳密に制御される。すなわち、フィードタンク22の液位が所定の範囲に制御されて、ヘッド圧の変動幅が制限されており、また、管路34及びポンプ35とは独立して循環系50を設けているために、ポンプ35の流量制御を介して、塗工ヘッド33の電極スラリSの吐出量の制御を厳密に制御される。このような厳密な制御により、電極膜の厚さが均一となった電極が得られる。
また、電極スラリSの一次貯蔵タンク21の貯蔵時に粗粒が生成されても、粗粒除去フィルタ53A,53Bで粗粒を除去することができる。
これらにより、電極スラリSを循環させて気泡と粗粒とを連続的かつ繰り返し除去するので、気泡と粗粒とが殆ど含まれない優れた性状の電極スラリSを基材Mに塗布することができ、スジや空隙、脱落等の電極欠陥を抑制することができる。
もちろん、遠心脱泡器以外の装置でも、塗工される電極スラリの性状に影響を与えるものでなければ、採用可能である。
すなわち、単純に、貯蔵部20から塗工部30に対して、電極スラリSを供給する管路34に粗粒除去フィルタを設けた場合には、メンテナンス時に塗工を停止しなければならず、生産能力が低下する。
また、仮に、同様の場所に粗粒除去フィルタを並列に設け、切り替え運用にすることにより、メンテナンス時に連続して塗工を行う構成にしたとしても、フィルタ切替時に管路34における弁開閉や呼び水・エア抜き等をしなければならず、塗工部30の電極スラリSの吐出量の厳密な制御ができなくなり、塗膜品質の劣化(電極膜の厚さの不均一等)を招いてしまう。
しかしながら、本実施形態の電極製造装置1によれば、管路34とは独立してフィードタンク22に循環系50が設けられているので、フィルタ部53のメンテナンス時も塗工を停止する必要がなく、連続運転時間の長時間化及び生産能力を向上させることができる。
さらに、本実施形態の電極製造装置1によれば、管路34とは独立してフィードタンク22に循環系50を設けているので、塗工部30の厳密な吐出量の制御に影響を与えることがなく、塗膜品質を一定に保つことができる。
しかしながら、本実施形態の電極製造装置1によれば、実際に電極を製作する塗工工程直前のフィードタンクにおいて粗粒と気泡とを直接的に除去するので、実効性が高いものとなる。
例えば、上述した実施形態では、製造部10においても真空脱泡する構成としたが、真空脱泡を行わなくても、気泡除去は遠心脱泡器54のみで行ってもよい。
10…製造部
20…貯蔵部
21…一次貯蔵タンク
22…フィードタンク
30…塗工部
33…塗工ヘッド
50…循環系
53A,53B…粗粒除去フィルタ
54…遠心脱泡器
55…副循環部
55a…回収タンク
M…基材
S…電極スラリ
Claims (4)
- 複数の材料を混合して電極スラリを製造する製造部と、
前記製造部に接続され、前記製造された電極スラリを貯留する貯留タンクと、
前記貯留タンクに接続され、前記貯留された電極スラリの粗粒を除去する粗粒除去フィルタと、
前記粗粒除去フィルタに接続され、前記粗粒が除去された電極スラリの気泡を除去して、前記貯留タンクに貯留された電極スラリの液位よりも下方に前記気泡が除去された電極スラリを戻す脱泡器と、
前記貯留タンクに接続され、前記貯留された電極スラリを基材に塗布する塗工部と、
を有する電極製造装置。 - 前記貯留タンク、前記粗粒除去フィルタ、および前記脱泡器を一定期間循環した前記貯留された電極スラリにより前記塗布を行う請求項1に記載の電極製造装置。
- 切替部をさらに有し、
前記粗粒除去フィルタは、前記切替部によりいずれか一方に切り替えられる第1および第2の粗粒除去フィルタを備え、
前記循環は前記切替部により切り替えられた前記第1または第2の粗粒除去フィルタのいずれか一方を介して行われる請求項2に記載の電極製造装置。 - 前記貯留された電極スラリの液位を検出する液位センサと
前記液位センサによる前記検出の結果を受信する制御部とをさらに有し、
前記制御部は、前記液位が所定範囲より低下したことを示す前記検出の結果を受信した場合には、前記製造部により製造された電極スラリを前記貯留タンクへ補充して前記所定範囲とする請求項3に記載の電極製造装置。
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US13/575,666 US20120291704A1 (en) | 2010-03-03 | 2011-03-02 | Electrode manufacturing apparatus |
EP11750670.9A EP2544266A4 (en) | 2010-03-03 | 2011-03-02 | DEVICE FOR PRODUCING ELECTRODES |
CN2011900002971U CN203071166U (zh) | 2010-03-03 | 2011-03-02 | 电极制造装置 |
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JP2010047049A JP5386408B2 (ja) | 2010-03-03 | 2010-03-03 | 電極製造装置 |
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US (1) | US20120291704A1 (ja) |
EP (1) | EP2544266A4 (ja) |
JP (1) | JP5386408B2 (ja) |
KR (1) | KR20120104402A (ja) |
CN (1) | CN203071166U (ja) |
TW (1) | TW201218487A (ja) |
WO (1) | WO2011108561A1 (ja) |
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US9731315B2 (en) | 2013-01-07 | 2017-08-15 | General Electric Company | Vacuum dip coating apparatus |
CN111203370A (zh) * | 2020-02-25 | 2020-05-29 | 深圳吉阳智能科技有限公司 | 锂离子电池浆料螺旋循环搅拌加工集成系统 |
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JP5983001B2 (ja) * | 2012-05-01 | 2016-08-31 | 日産自動車株式会社 | 電極用スラリー供給装置、および電極用スラリー供給方法 |
JP6115436B2 (ja) * | 2013-10-15 | 2017-04-19 | 株式会社豊田自動織機 | 混練機 |
WO2017014166A1 (ja) * | 2015-07-17 | 2017-01-26 | エリーパワー株式会社 | 電池電極スラリー分配装置、電池電極スラリー処理装置、電池電極スラリー分配方法、懸濁液分配装置、懸濁液分配方法、電池電極スラリー処理方法、作製装置、および作製方法 |
JP6562396B2 (ja) * | 2015-07-17 | 2019-08-21 | 大成建設株式会社 | 電池電極スラリー分配装置、電池電極スラリー処理装置、電池電極スラリー分配方法、懸濁液分配装置、および懸濁液分配方法 |
JP6757876B2 (ja) * | 2016-02-19 | 2020-09-23 | 大成建設株式会社 | 電池電極スラリー処理装置、電池電極スラリー処理方法、作製装置、および作製方法 |
JP6721956B2 (ja) * | 2015-07-28 | 2020-07-15 | 株式会社Screenホールディングス | 塗布装置および塗布方法 |
CN106669520B (zh) * | 2016-11-17 | 2023-07-28 | 山东精工电子科技股份有限公司 | 一种锂离子电池浆料的制备装置及方法 |
JP6887693B2 (ja) * | 2019-07-16 | 2021-06-16 | エリーパワー株式会社 | 循環装置、処理装置および電池電極スラリーの循環方法 |
KR102476940B1 (ko) * | 2020-07-02 | 2022-12-12 | 표형주 | 클라우드를 이용하여 제품 생산 공정이 최적화되도록 자동으로 제어하는 장치 및 방법 |
JP2022041420A (ja) * | 2020-09-01 | 2022-03-11 | エムテックスマート株式会社 | 塗布方法、燃料電池の製造方法または燃料電池、2次電池の製造方法または2次電池、全固体電池の製造方法または全固体電池 |
KR20230083032A (ko) * | 2021-12-02 | 2023-06-09 | 현대자동차주식회사 | 전극 코팅 시스템 |
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US20120291704A1 (en) | 2012-11-22 |
KR20120104402A (ko) | 2012-09-20 |
TW201218487A (en) | 2012-05-01 |
JP2011181465A (ja) | 2011-09-15 |
EP2544266A1 (en) | 2013-01-09 |
EP2544266A4 (en) | 2013-07-17 |
JP5386408B2 (ja) | 2014-01-15 |
CN203071166U (zh) | 2013-07-17 |
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