WO2015053198A1 - 電極ロールの乾燥方法、および電極ロールの乾燥装置 - Google Patents
電極ロールの乾燥方法、および電極ロールの乾燥装置 Download PDFInfo
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- WO2015053198A1 WO2015053198A1 PCT/JP2014/076594 JP2014076594W WO2015053198A1 WO 2015053198 A1 WO2015053198 A1 WO 2015053198A1 JP 2014076594 W JP2014076594 W JP 2014076594W WO 2015053198 A1 WO2015053198 A1 WO 2015053198A1
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- electrode roll
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- drying
- heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
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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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to an electrode roll drying method and an electrode roll drying apparatus.
- the battery performance deteriorates.
- the battery In order to prevent moisture from adhering to the electrode during manufacturing, the battery is generally manufactured in a dry room. In addition to when the battery is manufactured, when the electrode is transported or stored, moisture may adhere to the electrode. For this reason, it is common to dry the electrode roll which wound the electrode base material in roll shape around the winding core before battery assembly.
- the winding roll side of the electrode roll has a high winding pressure and it is difficult to escape moisture. Therefore, the present applicant has proposed a technique of drying the electrode roll by heating from the core side (see Patent Document 1).
- the present invention provides an electrode roll capable of reducing the drying time of the electrode roll by providing suitable conditions for the combined use of heating from the core side of the electrode roll and heating from the outside of the electrode roll. It is an object of the present invention to provide a drying method for an electrode roll and an electrode roll drying apparatus that embodies the method.
- the electrode roll in which the electrode base material is wound around the core is heated from the outside and both sides on the core side in a drying furnace.
- the outermost temperature of the electrode roll reaches a target temperature lower than the allowable temperature allowed as the upper limit temperature at the outermost portion, heating from the outside is stopped, the inside of the drying furnace is depressurized, and the winding core Side heating and decompression are performed.
- the electrode roll drying apparatus of the present invention that achieves the above object has a drying furnace, an outer heater, a shaft heater, a decompressor, a sensor, and a control unit.
- the drying furnace stores an electrode roll in which an electrode base material is wound around a winding core.
- the outer heater heats the electrode roll housed in the drying furnace from the outside.
- the shaft-side heater heats the electrode roll housed in the drying furnace from the core side.
- the decompressor reduces the internal pressure of the drying furnace.
- the sensor detects the outermost temperature of the electrode roll.
- the control unit controls operations of the outer heater, the shaft heater, and the pressure reducer based on the outermost temperature of the electrode roll detected by the sensor.
- the control unit operates the outer heater and the shaft side heater to heat the electrode roll from both the outer side and the core side.
- the control unit stops the operation of the outer heater and operates the pressure reducer.
- the inside of the drying furnace is depressurized. Thus, heating by the shaft side heater and pressure reduction by the pressure reducer are performed.
- FIG. 5A is a graph showing the temperature change of the electrode roll during the drying operation
- FIG. 5B is a time chart showing the operating conditions of the outer heater, the shaft side heater, and the decompressor.
- FIG. 5A is a graph showing the temperature change of the electrode roll during the drying operation
- FIG. 5B is a time chart showing the operating conditions of the outer heater, the shaft side heater, and the decompressor.
- FIG. 1 is a schematic configuration diagram showing a drying apparatus 10 for an electrode roll 20 according to an embodiment of the present invention
- FIG. 2 is a perspective view showing the electrode roll 20
- FIG. 3 cuts an electrode substrate 21 of the electrode roll 20. It is a schematic sectional drawing which shows an example of the electric device to which the electrode formed by applying is applied.
- the drying device 10 for the electrode roll 20 generally includes a drying furnace 30, an outer heater 40, an axial heater 50, a decompressor 60, a sensor 70, and a controller 80.
- the drying furnace 30 houses the electrode roll 20 around which the electrode base material 21 is wound around the core 22.
- the outer heater 40 heats the electrode roll 20 accommodated in the drying furnace 30 from the outside.
- the shaft side heater 50 heats the electrode roll 20 accommodated in the drying furnace 30 from the core 22 side.
- the decompressor 60 reduces the internal pressure of the drying furnace 30.
- the sensor 70 detects the outermost temperature of the electrode roll 20.
- the controller 80 controls the operation of the outer heater 40, the shaft heater 50, and the decompressor 60 based on the outermost temperature of the electrode roll 20 detected by the sensor 70.
- the controller 80 operates the outer heater 40 and the shaft side heater 50 to heat the electrode roll 20 from both the outer side and the core 22 side.
- the control unit 80 stops the operation of the outer heater 40 and operates the decompressor 60.
- the inside of the drying furnace 30 is depressurized. Thereby, heating by the shaft side heater 50 and pressure reduction by the pressure reducer 60 are performed. Details will be described below.
- the electrode roll 20 is configured by winding a long electrode base material 21 around a hollow core 22 as shown in FIG.
- the electrode substrate 21 is configured by forming active material layers on both sides of a current collector.
- the electrode substrate 21 is fed out from the core 22 and cut into a predetermined length to form an electrode.
- moisture in the air may condense and adhere to the electrode substrate 21.
- battery performance decreases.
- Lithium ion secondary batteries used for automobiles are relatively large in size and tend to increase the amount of moisture adhering, and therefore countermeasures against moisture adhering are particularly necessary. It is also conceivable to dry the power generation element after forming the power generation element including the electrodes. However, since various battery elements are mixed in the power generation element, the amount of heat necessary for moisture removal cannot be applied to the electrodes, and moisture removal may be insufficient. Therefore, it is desirable to dry the electrode base 21 in the form of the electrode roll 20 before cutting.
- the drying furnace 30 has a door 31 that can be freely opened and closed, and the electrode roll 20 is taken in and out through the opened door 31.
- the drying furnace 30 is composed of a vacuum chamber, and airtightness is enhanced so that gas does not flow into the interior after decompression.
- a support member 32 that supports the electrode roll 20 accommodated therein is provided inside the drying furnace 30.
- the support member 32 includes a support leg 33 that is fixed to the floor surface of the drying furnace 30 and a support cylinder portion 34 that is detachably attached to the support leg 33.
- the support cylinder portion 34 can be inserted through the core 22 of the electrode roll 20.
- the support member 32 supports the electrode roll 20 by attaching the support cylinder portion 34 inserted through the winding core 22 to the support leg 33.
- the outer heater 40 is disposed on the wall surface of the drying furnace 30 facing the surface of the electrode roll 20 and transfers heat from the surface of the electrode roll 20 toward the core. In the case of drying while rotating the electrode roll 20, the number of installed outer heaters 40 can be reduced.
- the shaft side heater 50 is disposed on the shaft center of the support cylinder portion 34 and transfers heat from the core portion of the electrode roll 20 toward the surface.
- the outer heater 40 and the shaft heater 50 are composed of electric heaters.
- the outer heater 40 is connected to the power supply unit via a switch 41 that turns on and off energization. Switching between heating start and heating stop of the outer heater 40 is performed by operating the switch 41.
- the shaft-side heater 50 is also connected to the power supply unit via a switch 51 that turns on and off energization. Switching between the start and stop of heating of the shaft side heater 50 is performed by the operation of the switch 51.
- the decompressor 60 is composed of a vacuum pump, and discharges the gas inside the drying furnace 30 to the outside.
- the decompressor 60 decompresses the inside of the drying furnace 30 from the atmospheric pressure state to the vacuum state.
- the degree of vacuum is not particularly limited, but is, for example, about 1 Torr (133.32 Pa), which is about the same as a general general-purpose vacuum oven.
- the sensor 70 can be a general temperature sensor such as a thermocouple.
- the sensor 70 is attached to the surface of the electrode roll 20 and detects the outermost temperature of the electrode roll 20.
- the sensor 70 can use a non-contact type thermometer such as an infrared radiation thermometer in place of the contact type thermocouple.
- the control unit 80 includes a CPU, a RAM, a ROM, a timer, and the like, and the electrode roll 20 is dried by the CPU executing a control program stored in the ROM.
- a signal relating to the temperature at the outermost part of the electrode roll 20 detected by the sensor 70 is input to the control unit 80. From the control unit 80, a control signal for switching the heating start and the heating stop to the switch 41 for the outer heater 40, a control signal for switching the heating start and the heating stop to the switch 51 for the shaft side heater 50, and A control signal for switching operation start and operation stop of the decompressor 60 is output.
- FIG. 3 shows a lithium ion secondary battery 100 as an example of an electric device.
- a power generation element 104 formed by sequentially stacking a negative electrode 101, a separator 102, and a positive electrode 103 is sealed with an exterior material 105.
- active material layers are formed on both surfaces of a current collector 101a.
- active material layers are formed on both surfaces of the current collector 103a.
- the separator 102 constitutes an electrolyte layer by being impregnated with the electrolyte.
- the current collector 101a of the negative electrode 101 is extended and connected to the negative electrode tab 106 for power extraction.
- the current collector 103a of the positive electrode 103 is extended and connected to the positive electrode tab 107 for extracting power. Some of the tabs 106 and 107 protrude outward from the exterior material 105.
- the exterior material 105 is configured by heat-sealing the peripheral portions of two laminated films.
- the negative electrode 101 is manufactured by cutting an electrode roll 20 obtained by winding the electrode base material 21 for the negative electrode 101 into a roll shape, and then cutting it.
- the positive electrode 103 is manufactured by cutting an electrode roll 20 obtained by winding the electrode base material 21 for the positive electrode 103 into a roll shape after a necessary length. The reason why the electrode base material 21 is wound in a roll shape is in consideration of the convenience of conveyance and the like.
- FIG. 4 is a schematic diagram showing a position where a thermocouple is set in the drying test of the electrode roll 20
- FIG. 5A is a graph showing a temperature change of the electrode roll 20 during the drying operation
- FIG. 4 is a time chart showing operating states of an outer heater 40, a shaft heater 50, and a decompressor 60.
- thermocouple in the drying test of electrode roll 20, the thermocouple is divided into an outermost position P ⁇ b> 1 of electrode roll 20, a position P ⁇ b> 2 of the core part of electrode roll 20, and a central position between both positions. Set to P3.
- the thermocouple was inserted and set inward in the axial direction from the axial end surface of the electrode roll 20 to reduce the influence of heating from the axial end surface.
- the temperature was measured at two points that are symmetric with respect to the axis center, and the average temperature at the two points was adopted as the temperature at each of the positions P1, P2, and P3.
- the outermost temperature of the electrode roll 20 is indicated by a solid line
- the temperature of the core part is indicated by a one-dot chain line
- the temperature of the center part is indicated by a two-dot chain line.
- the outer diameter of the electrode roll 20 is increased in order to improve productivity, and it is necessary for moisture drying in the radially outer portion of the electrode roll 20 only by heat conduction radially outward. It takes longer time to transmit a large amount of heat. As a result, there is a possibility that drying on the outer portion of the electrode roll 20 becomes insufficient.
- the electrode roll 20 When the outer diameter of the electrode roll 20 is increased, in order to efficiently supply the amount of heat necessary for drying the electrode roll 20, as a result of various studies, the electrode roll 20 is transferred in the atmosphere before moving to vacuum drying. It was found that it is most efficient to conduct heat in the diameter direction.
- the electrode roll 20 in order to shorten the drying time of the electrode roll 20 by giving a suitable condition when the heating from the core 22 side of the electrode roll 20 and the heating from the outside of the electrode roll 20 are used in combination.
- the electrode roll 20 is dried by the following procedure.
- the electrode roll 20 is accommodated in the drying furnace 30, the door part 31 is closed, and the drying furnace 30 is sealed.
- the control unit 80 turns on both the switch 41 for the outer heater 40 and the switch 51 for the shaft-side heater 50. Heating from the outside of the electrode roll 20 is started by the outer heater 40. Heating from the core 22 side of the electrode roll 20 is started by the shaft side heater 50. The control unit 80 keeps the operation of the decompressor 60 off.
- the heat is transferred in the diameter direction of the electrode roll 20.
- the temperature of the electrode roll 20 is raised in the order of the outermost part, the core part, and the central part. Since heat is applied in the radial direction from the outside of the electrode roll 20 and from both sides on the core 22 side, the amount of heat required for drying the electrode roll 20 can be given evenly and in a short time.
- the electrode substrate 21 is stretched in the winding direction due to thermal expansion. A fine space is generated between the layers of the wound electrode substrate 21. Water evaporates through this fine space.
- each component in the electrode substrate 21 has a heat resistant temperature due to the relationship with the material.
- the electrode roll 20 has a permissible temperature (about 120 ° C. to 140 ° C.) that is allowed as the upper limit temperature.
- a target temperature lower than the allowable temperature is set as the outermost temperature of the electrode roll 20.
- the target temperature is not particularly limited, for example, a temperature lower by about 15 degrees than the allowable temperature is set.
- the waiting time varies depending on the material constituting the electrode base material 21, it is determined in advance by trial and error. For example, when only heating from the core 22 side of the electrode roll 20 is continued, the standby time reaches a temperature at which the temperature of the central portion of the electrode roll 20 is about 30 degrees lower than the allowable temperature, for example. Time until.
- the temperature of the core portion of the electrode roll 20 is adjusted so as to maintain the target temperature. Heat applied from the outside of the electrode roll 20 is transmitted radially inward, heat applied from the core 22 side of the electrode roll 20 is transmitted radially outward, and the temperature of the central portion of the electrode roll 20 rises.
- a standby time is provided before switching to vacuum drying, and the amount of heat necessary to evaporate the water in the central portion of the electrode roll 20 is added under atmospheric pressure. Therefore, in the subsequent vacuum drying, the temperature of the central portion of the electrode roll 20 can be sufficiently increased.
- the reduced pressure in the drying furnace 30 lowers the boiling point and promotes water evaporation. As a result, the electrode roll 20 can be dried quickly.
- the control unit 80 continues the vacuum drying for a predetermined time. This predetermined time is also determined in advance by trial and error. The predetermined time is set to a time sufficient for the temperature of the central portion of the electrode roll 20 to reach the target temperature and the central portion of the electrode roll 20 is dried.
- the operation of the decompressor 60 is stopped, the inside of the drying furnace 30 is returned to atmospheric pressure, and the electrode roll 20 is cooled.
- the dried electrode roll 20 is conveyed from the drying furnace 30 to a dry room, and a battery is manufactured.
- thermocouple When the battery is actually produced, the thermocouple is set at the outermost position P1 of the electrode roll 20 and the position of the core part P2, and the outer heater 40 and The electrode roll 20 is dried while controlling the operation of the shaft side heater 50.
- the control unit 80 operates the outer heater 40 and the shaft side heater 50 to heat the electrode roll 20 from both sides on the outer side and the core 22 side.
- the outermost temperature reaches a target temperature lower than the allowable temperature allowed as the upper limit temperature at the outermost portion
- the operation of the outer heater 40 is stopped, the decompressor 60 is operated, and the inside of the drying furnace 30 is decompressed. Heating by the shaft side heater 50 and decompression by the decompressor 60 are performed.
- the outermost part of the electrode roll 20 is controlled so as not to exceed the allowable temperature, and moisture evaporation of the electrode roll 20 is promoted by the reduced pressure of the drying furnace 30, and the electrode roll 20 is dried quickly. be able to.
- the controller 80 stops the operation of the outer heater 40 and stops the heating from the outside, and then operates the decompressor 60 to reduce the pressure in the drying furnace 30 after a preset standby time has elapsed.
- the electrode roll 20 can be dried to the center.
- the required amount of heat can be applied in a relatively short time.
- the temperature of the central portion of the electrode roll 20 rises in a relatively short time, and the electrode base material 21 located in the central portion that is difficult to dry can be quickly and sufficiently dried.
- the decompressor 60 depressurizes the inside of the drying furnace 30 from the atmospheric pressure state to the vacuum state. According to this configuration, the boiling point of water decreases due to the reduced pressure of the drying furnace 30, moisture evaporation of the electrode roll 20 is promoted, and the electrode roll 20 can be dried more quickly.
- the outer heater 40 and the shaft side heater 50 are composed of electric heaters, and switching between heating start and heating stop is performed by a switch. Thus, according to the structure, the responsiveness of switching of heating / stopping can be improved.
- FIG. 6 is a cross-sectional view showing the drying device 11 for the electrode roll 20 according to a modification.
- symbol is attached
- the electrode roll 20 drying device 11 according to the modification differs from the embodiment in which one electrode roll 20 is accommodated in one drying furnace 30 in that a plurality of electrode rolls 20 are accommodated in one drying furnace 130. To do.
- the drying furnace 130 is configured to be capable of storing a total of four electrode rolls 20 in two stages at the upper and lower stages. Eight outer heaters 40 are attached to the wall surface, and shaft side heaters 50 are disposed in the respective shaft centers of the four electrode rolls 20. A sensor 70 for detecting the outermost temperature is attached to each electrode roll 20. And the control part 80 controls the drying with respect to each of the several electrode roll 20 accommodated in the one drying furnace 130. FIG. As in the case of the embodiment, the control unit 80 operates the outer heater 40 and the shaft side heater 50 to heat the electrode roll 20 from both the outer side and the core 22 side, and the outermost temperature of the electrode roll 20 is increased. When the target temperature is reached, the operation of the outer heater 40 is stopped, the decompressor 60 is activated, the inside of the drying furnace 130 is decompressed, and heating by the shaft side heater 50 and decompression by the decompressor 60 are performed.
- each electrode roll 20 is controlled so as not to exceed the allowable temperature, and each electrode roll is controlled by reducing the pressure in the drying furnace 130. As a result, the evaporation of water 20 is promoted, and each electrode roll 20 can be dried quickly.
- the drying furnace 130 may be configured so that a plurality of electrode rolls 20 are arranged on the same axis and can be stored. Also in this case, the outermost part of each electrode roll 20 is controlled so as not to exceed the allowable temperature, and the evaporation of moisture in each electrode roll 20 is promoted by the reduced pressure of the drying furnace 130, and each electrode roll 20 is It can be dried quickly.
- Drying equipment 20 electrode rolls, 21 electrode substrate, 22 core, 30 drying oven, 40 outer heater, 41 Switch for outer heater, 50 axis heater, 51 Axis side heater switch, 60 decompressor, 70 sensors, 80 control unit, 130 Drying oven.
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Abstract
Description
図6は、変形例に係る電極ロール20の乾燥装置11を示す断面図である。なお、実施形態と共通する部材には同一の符号を付し、その説明は一部省略する。
20 電極ロール、
21 電極基材、
22 巻芯、
30 乾燥炉、
40 外側ヒーター、
41 外側ヒーター用のスイッチ、
50 軸側ヒーター、
51 軸側ヒーター用のスイッチ、
60 減圧器、
70 センサー、
80 制御部、
130 乾燥炉。
Claims (10)
- 乾燥炉の中で、巻芯の周りに電極基材を巻回した電極ロールを、外側および巻芯側の両側から加熱し、前記電極ロールの最外部の温度が前記最外部における上限温度として許容する許容温度よりも低い目標温度に達した場合、外側からの加熱を停止し、前記乾燥炉内を減圧し、巻芯側からの加熱と減圧とを実施してなる、電極ロールの乾燥方法。
- 外側からの加熱を停止した後、予め設定された待機時間経過後に、前記乾燥炉内を減圧する、請求項1に記載の電極ロールの乾燥方法。
- 前記乾燥炉内を、大気圧状態から、真空状態まで減圧する、請求項1または請求項2に記載の電極ロールの乾燥方法。
- 前記電極ロールの外側からの加熱および巻芯側からの加熱を電気ヒーターによって行い、加熱開始と加熱停止との切り替えをスイッチによって行う、請求項1~3のいずれか1項に記載の電極ロールの乾燥方法。
- 1つの前記乾燥炉内に収納した複数個の電極ロールのそれぞれに対する乾燥を実施してなる、請求項1~4のいずれか1項に記載の電極ロールの乾燥方法。
- 巻芯の周りに電極基材を巻回した電極ロールを収納する乾燥炉と、
前記乾燥炉内に収納された前記電極ロールを外側から加熱する外側ヒーターと、
前記乾燥炉内に収納された前記電極ロールを巻芯側から加熱する軸側ヒーターと、
前記乾燥炉の内部圧力を低下させる減圧器と、
前記電極ロールの最外部の温度を検出するセンサーと、
前記センサーによって検出した前記電極ロールの最外部の温度に基づいて、前記外側ヒーター、前記軸側ヒーター、および減圧器の作動を制御する制御部と、を有し、
前記制御部は、前記外側ヒーターおよび前記軸側ヒーターを作動して前記電極ロールを外側および巻芯側の両側から加熱し、前記電極ロールの最外部の温度が前記最外部における上限温度として許容する許容温度よりも低い目標温度に達した場合、前記外側ヒーターの作動を停止し、前記減圧器を作動させて前記乾燥炉内を減圧し、前記軸側ヒーターによる加熱と前記減圧器による減圧とを実施してなる、電極ロールの乾燥装置。 - 前記制御部は、前記外側ヒーターの作動を停止して外側からの加熱を停止した後、予め設定された待機時間経過後に、前記減圧器を作動させて前記乾燥炉内を減圧する、請求項6に記載の電極ロールの乾燥装置。
- 前記減圧器は、前記乾燥炉内を、大気圧状態から、真空状態まで減圧する、請求項6または請求項7に記載の電極ロールの乾燥装置。
- 前記外側ヒーターおよび前記軸側ヒーターは、電気ヒーターから構成され、加熱開始と加熱停止との切り替えをスイッチによって行う、請求項6~8のいずれか1項に記載の電極ロールの乾燥装置。
- 前記制御部は、1つの前記乾燥炉内に収納した複数個の電極ロールのそれぞれに対する乾燥を制御する、請求項6~9のいずれか1項に記載の電極ロールの乾燥装置。
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