JP2019185862A - Electrode manufacturing device - Google Patents

Abstract

To provide an electrode manufacturing device that can suppress equipment costs and operation costs.SOLUTION: An electrode manufacturing device includes a solvent recovery unit 50. The solvent recovery unit 50 includes an adsorption zone 54a for recovering solvent vapor contained in first gas to be treated G1 discharged from a first drying device 31 by adsorbing the solvent vapor to an adsorbent, and a desorption zone 54b for desorbing the solvent vapor adsorbed on the adsorbent from the adsorbent. The electrode manufacturing device includes a first gas supply path 33 for introducing the first gas to be treated G1 generated when an active material mixture is heated and dried by the first drying device 31 into the adsorption zone 54a, and a second gas supply path 42 for introducing second gas to be treated G2 generated when the active material mixture is heated and dried by a second drying device 41 into the desorption zone 54b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrode manufacturing apparatus comprising: an adsorption unit that recovers by adsorbing solvent vapor contained in a gas to be treated by an adsorbent; and a desorption unit that desorbs solvent vapor adsorbed on the adsorbent from the adsorbent. .

  Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with lithium ion secondary batteries as power storage devices that store power supplied to the motors that serve as prime movers. The lithium ion secondary battery includes a positive electrode and a negative electrode. The electrode generally has an active material layer carried on a current collector. The active material layer is manufactured by preparing an active material mixture in which an active material, a binder, a conductive auxiliary agent and the like are dispersed in an organic solvent, applying the active material mixture to a current collector, and drying. The organic solvent is useful for dissolving the solid binder, increasing the affinity between the active material and the binder, and increasing the affinity between the active material mixture and the current collector. As such an organic solvent, for example, N-methyl-2-pyrrolidone (hereinafter abbreviated as NMP if necessary) is often used.

  However, the organic solvent becomes unnecessary after the active material mixture is formed as a predetermined layer on the current collector, and is thus evaporated and evaporated to be removed from the active material mixture as solvent vapor. Since it is not preferable from the viewpoint of environmental hygiene to exhaust the exhaust gas containing the solvent vapor into the atmosphere, the solvent vapor in the exhaust gas is recovered.

  In order to recover the solvent vapor, for example, a solvent recovery facility disclosed in Patent Document 1 is used. The solvent recovery facility of Patent Document 1 is a cooling system that condenses and separates and recovers the solvent vapor contained in the gas to be processed by cooling the gas to be processed generated in a coating drying furnace for drying the object to be processed (electrode). A collection unit is provided. The solvent recovery facility of Patent Document 1 includes an adsorption recovery unit that separates and recovers the solvent vapor from the gas to be processed by causing the adsorbent to adsorb the solvent vapor remaining in the gas to be processed after cooling in the cooling recovery unit. Moreover, the solvent collection | recovery equipment of patent document 1 equips an adsorption | suction collection part with the desorption area | region part which desorbs the solvent vapor | steam adsorbed | sucked to the adsorbent by supplying desorption gas to an adsorbent.

JP-A-2015-44160

  As disclosed in Patent Document 1, it is desired to suppress the facility cost and the operation cost in the facility for adsorbing the solvent vapor by the adsorbent and desorbing the solvent vapor from the adsorbent.

  The objective of this invention is providing the electrode manufacturing apparatus which can suppress an installation cost and an operating cost.

  An electrode manufacturing apparatus for solving the above problems includes a first drying device for heating and drying an active material mixture applied to a current collector for an electrode of a lithium ion secondary battery, and drying by the first drying device. A second drying device for heating and drying the active material mixture at a temperature higher than the heating temperature of the first drying device, and a solvent generated when the active material mixture is heated and dried by the first drying device. A first gas to be treated containing vapor is introduced, an adsorbing part for recovering the solvent vapor by adsorbing the solvent vapor contained in the first gas to be treated to an adsorbent, and the adsorbed by the adsorbent A solvent recovery device having a desorption part for desorbing solvent vapor from the adsorbent, and a first gas to be treated generated when the active material mixture is heated and dried by the first drying apparatus are introduced into the adsorption part. First gas supply When, and summarized in that with a second gas supply passage for introducing the second processed gas occurring in the desorption unit when the heated drying the active material mixture by the second drying unit.

  According to this, the 1st to-be-processed gas which generate | occur | produced with the 1st drying apparatus is introduce | transduced into an adsorption | suction part by the 1st gas supply path. Then, the solvent vapor contained in the first gas to be treated is adsorbed by the adsorbent. In addition, the second gas to be processed generated in the second drying device is introduced into the desorption portion through the second gas supply path, and the solvent vapor adsorbed on the adsorbent is desorbed from the adsorbent. Therefore, the thermal energy which the 2nd to-be-processed gas generate | occur | produced with the 2nd drying apparatus can be utilized for desorption of adsorption material. Therefore, for example, in order to use the first gas to be treated discharged from the first drying apparatus for desorption of the adsorbent, it is not necessary to reheat the first gas to be treated. Equipment costs and operating costs can be reduced by eliminating the heating step.

Moreover, the electrode manufacturing apparatus may include a chemical heat pump that stores heat of the second gas to be processed in the second gas supply path.
According to this, the temperature of the second gas to be treated can be adjusted to a temperature suitable for desorption before the second gas to be treated is introduced into the desorption part by heat storage by the chemical heat pump or supply of heat by the chemical heat pump. .

  The electrode manufacturing apparatus further includes a concentration measuring device that measures the concentration of the solvent vapor contained in the first gas to be processed, and the control unit that controls the internal temperature of the second drying device includes the concentration measuring device. The internal temperature of the second drying device may be controlled in accordance with the concentration of the solvent vapor measured by the above.

  According to this, the internal temperature of a 2nd drying apparatus can be controlled to the temperature required for drying of the active material mixture in a 2nd drying apparatus, and useless energy consumption can be suppressed.

  According to the present invention, equipment cost and operation cost can be suppressed.

The perspective view which shows an electrode. The schematic diagram which shows an electrode manufacturing equipment and an electrode manufacturing apparatus.

Hereinafter, an embodiment embodying an electrode manufacturing apparatus will be described with reference to FIGS.
First, a lithium ion secondary battery provided with an electrode will be described. Although not shown, the lithium ion secondary battery is a prismatic battery having a square appearance. The lithium ion secondary battery includes an electrode assembly in a case. The electrode assembly is configured by laminating a plurality of positive electrodes and a plurality of negative electrodes alternately with the electrodes insulated from each other.

  As shown in FIG. 1, each of the positive electrode 10 and the negative electrode 10 has a rectangular shape. The electrode 10 includes an active material layer 12 on both surfaces of a rectangular metal foil (a positive electrode is an aluminum foil and a negative electrode is a copper foil) 11.

Next, a method for manufacturing the electrode 10 will be described.
As shown in FIG. 2, the electrode manufacturing method is such that an active material mixture is continuously applied to the surface of a long metal foil 13 as a strip-shaped current collector to form a coating portion 14 to form an electrode material 15. A coating process for forming the coating part, a first drying process for drying the coating part 14, and a pressing process for increasing the density of the coating part 14 by pressurization. Moreover, the manufacturing method of an electrode passes through the 2nd drying process which removes the slight organic solvent and water | moisture content which remain | survive in the coating part 14, and the cutting process (not shown) which cuts the electrode material 15 into the shape of an electrode. . And the electrode 10 is cut out from the electrode material 15 at a cutting process, and the electrode 10 is completed.

Next, the production facility 20 for manufacturing the electrode material 15 will be described.
The production facility 20 includes a coating apparatus 21 that performs a coating process, a first drying apparatus 31 that performs a first drying process, and a second drying apparatus 41 that performs a second drying process. The production facility 20 also includes a solvent recovery device 50 that recovers solvent vapor from the first gas to be processed G1 discharged from the first drying device 31 and the second gas to be processed G2 discharged from the second drying device 41. . Moreover, the production facility 20 includes a pressing device 25 that performs a pressing process.

  In the production facility 20, the long metal foil 13 is transported by a transport device. The transport device includes a supply reel 22 and a take-up reel 23. A long metal foil 13 is wound around the supply reel 22. The long metal foil 13 is wound around the supply reel 22 with the longitudinal direction extending in the circumferential direction of the supply reel 22. The supply reel 22 is rotatably supported by a support device (not shown).

  The take-up reel 23 is rotatably supported by a support device (not shown). The long metal foil 13 supplied from the supply reel 22 is taken up by a rotating take-up reel 23. As a result, the long metal foil 13 is conveyed in the longitudinal direction at a constant speed. A direction in which the long metal foil 13 is conveyed is defined as a conveyance direction D.

  The coating device 21 is disposed opposite to both sides of the long metal foil 13. In the coating apparatus 21, the active material mixture coating method may be other than the slit die method. In the coating process, the active material mixture is continuously applied from the coating device 21 to each surface of the long metal foil 13 fed from the supply reel 22. On both surfaces of the long metal foil 13, an active material mixture coating portion 14 is continuously formed in the longitudinal direction of the long metal foil 13. An active material mixture contains the active material according to each polarity, a conductive support agent, a solvent, and a binder.

  Examples of the active material for the positive electrode 10 include composite oxide, metallic lithium, and sulfur. The composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium. The active material for the negative electrode 10 is, for example, carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ 0.5 and metal oxides such as x ≦ 1.5) and boron-added carbon.

The conductive auxiliary agent is a carbon-based substance containing carbon (C), and examples thereof include carbon black, graphite, acetylene black, and ketjen black.
Examples of the binder include thermoplastic resins such as polyimide amide and polyimide, and polymer resins having an imide bond in the main chain. Examples of the solvent (solvent) include organic solvents such as NMP (N-methylpyrrolidone), methanol, and methyl isobutyl ketone.

  The first drying device 31 of the production facility 20 is arranged downstream of the coating device 21 in the transport direction D of the long metal foil 13. The first drying device 31 includes a drying furnace 31a and an air supply unit 31b. The drying furnace 31a heats the air supplied from the air supply unit 31b with heat from a heat source, and supplies a processing gas that is hot air into the drying furnace 31a. In the first drying step, the coating part 14 of the electrode material 15 passing through the drying furnace 31a is heated by the processing gas supplied to the inside of the drying furnace 31a, and the coating part 14 is dried. The inside of the drying furnace 31a is heated to about 100 ° C.

  In the first drying step, most of the organic solvent (solvent) contained in the active material mixture is evaporated and evaporated, and the binder is cured by heat, and the active material and the conductive additive are fixed to each other. As a result, the first gas to be treated G1 containing the vaporized organic solvent is generated in the drying furnace 31a.

  The production facility 20 discharges the first gas to be processed G1 from the drying furnace 31a of the first drying device 31 and the first exhaust path 32 for sending a part of the first gas to be processed G1 to the second drying device 41. Prepare. Further, the production facility 20 includes a first gas supply path 33 branched from the first exhaust path 32, and the first gas supply path 33 sends a part of the first processing target gas G <b> 1 to the solvent recovery device 50. The first gas supply path 33 is a duct. Since the pressure in the drying furnace 31a of the first drying device 31 is higher due to heating, the case 52 of the solvent recovery device 50 has a negative pressure in the drying furnace 31a. G1 is supplied to the solvent recovery device 50 via the first gas supply path 33.

  The second drying device 41 of the production facility 20 includes a drying furnace 41a. The second drying step is performed to remove a slight amount of organic solvent and moisture remaining in the coating unit 14. The second drying step is performed by placing the electrode material 15 taken up on the take-up reel 23 in the drying furnace 41a. The inside of the drying furnace 41a is heated to about 150 to 300 ° C. And a 2nd drying process is performed by heating the inside of the drying furnace 41a, and the little organic solvent which remain | survives in the coating part 14, and the water | moisture content absorbed from the surrounding air volatilize. As a result, in the drying furnace 41a, a second gas to be treated G2 is generated that contains a small amount of solvent vapor, which is an organic solvent evaporated and evaporated. The 2nd drying apparatus 41 is provided with the control part 41b which controls the temperature in the drying furnace 41a.

  The production facility 20 includes a second gas supply path 42 that discharges the second treated gas G2 from the inside of the drying furnace 41a of the second drying device 41 and sends the second treated gas G2 to the solvent recovery device 50. The second gas supply path 42 is a duct. Since the pressure in the drying furnace 41a of the second drying apparatus 41 is higher due to heating, the case 52 of the solvent recovery apparatus 50 has a negative pressure in the drying furnace 41a. G2 is supplied to the solvent recovery device 50 via the second gas supply path 42.

  The solvent recovery device 50 recovers the solvent vapor contained in the first gas to be processed G1 and the second gas to be processed G2. The solvent recovery device 50 is an adsorption / desorption type concentrating device. The solvent recovery device 50 includes an adsorption rotor 51 and a case 52 that accommodates the adsorption rotor 51. The adsorption rotor 51 includes a cylindrical rotor 53, and an adsorbent selected from zeolite, mesoporous silica, calcium silicate hydrate, amorphous aluminum silicate, a hydrophilic polymer composite, and the like is contained in the rotor 53. The supported filter F is filled. In this embodiment, zeolite is used as the adsorbent.

  When the first processing gas G1 and the second processing gas G2 are caused to flow into the adsorption rotor 51, the first processing gas G1 and the second processing gas G2 pass in the axial direction of the adsorption rotor 51. The suction rotor 51 rotates with the central axis L of the suction rotor 51 as the center of rotation.

  The suction rotor 51 is divided into four zones 54. By rotating the adsorption rotor 51 around the central axis L as a rotation center, the zones 54 can be opposed to the first gas supply path 33 and the second gas supply path 42 in order. The four zones 54 of the adsorption rotor 51 are sequentially changed to an adsorption zone 54a as an adsorption portion and a desorption zone 54b as a desorption portion. The zone into which the first gas to be treated G1 discharged from the first drying device 31 is introduced is an adsorption zone 54a. By introducing the first treated gas G1 into the adsorption zone 54a, the first treated gas G1 comes into contact with the adsorbent of the filter F, and the solvent vapor contained in the first treated gas G1 is adsorbed by the adsorbent. The Thereby, solvent vapor | steam is collect | recovered from the 1st to-be-processed gas G1, the 1st to-be-processed gas G1 is cleaned, and is discharged | emitted as the processed gas G. FIG. The treated gas G discharged from the adsorption zone 54a is discharged from the discharge path 36 to the atmosphere.

  A zone into which the second gas to be treated G2 discharged from the second drying device 41 is introduced is a desorption zone 54b. When the suction rotor 51 rotates, one zone 54 that is the suction zone 54a moves to become the desorption zone 54b. Then, by introducing the second gas to be treated G2 having a temperature higher than that of the first gas to be treated G1 into the desorption zone 54b, the solvent vapor adsorbed on the adsorbent is desorbed from the adsorbent, and from the desorption zone 54b. The desorption gas G3 containing the solvent vapor is discharged. The production facility 20 includes a circulation path 35 that sends the desorption gas G3 discharged from the desorption zone 54b to the first drying device 31. The desorption gas G3 is returned to the first drying device 31 via the circulation path 35.

  Then, the first drying device 31, the first exhaust passage 32, the first gas supply passage 33, the second drying device 41, the second gas supply passage 42, the solvent recovery device 50, the discharge passage 36, An electrode manufacturing apparatus is configured from the circulation path 35. The production facility 20 includes an electrode manufacturing apparatus.

The electrode manufacturing apparatus of the production facility 20 further includes a chemical heat pump 60 disposed on the second gas supply path 42. The chemical heat pump 60 is a chemical heat pump using a dehydration endothermic reaction of lithium hydroxide monohydrate and a hydration exothermic reaction of lithium hydroxide. Here, “dehydration reaction of lithium hydroxide monohydrate (LiOH · H ₂ O)” means that hydrated water is released from lithium hydroxide monohydrate and lithium hydroxide (LiOH) and water (H ₂ O).

In the chemical heat pump 60, lithium hydroxide monohydrate (LiOH.H ₂ O) stores heat of dehydration endothermic reaction in which lithium hydroxide and water (steam) are dehydrated to store lithium hydroxide monohydrate. The energy generated by the hydration reaction between lithium hydroxide and water (steam) generated by the dehydration endothermic reaction of the product can be used.

The reaction vessel of the chemical heat pump 60 is filled with lithium hydroxide monohydrate (LiOH.H ₂ O), and hydroxylates using the heat of the second gas to be treated G2 flowing through the second gas supply path 42. A dehydration endothermic reaction in which lithium monohydrate is decomposed into lithium hydroxide and water vapor, or a hydration exothermic reaction between lithium hydroxide generated by the dehydration endothermic reaction and liquid water is performed. The chemical heat pump 60 stores the heat of the second gas to be treated G2 to a temperature suitable for desorption of the solvent vapor in the desorption zone 54b.

  The electrode manufacturing apparatus of the production facility 20 includes a concentration measuring device 61 installed in the first exhaust path 32. The concentration measuring device 61 measures the concentration of the solvent vapor in the first processing gas G1 flowing through the first exhaust path 32. The concentration measuring device 61 is signal-connected to the control unit 41 b of the second drying device 41. The control unit 41 b controls the internal temperature of the drying furnace 41 a of the second drying device 41 based on the measurement result of the concentration measuring device 61. The higher the concentration of the solvent vapor in the first gas to be treated G1, the smaller the amount of the solvent vapor remaining in the coating part 14 after the first drying process. The smaller the amount of the organic solvent remaining in the coating part 14, the smaller the amount of heat required for volatilizing the organic solvent in the second drying step. For this reason, the control part 41b performs control which makes the internal temperature of the drying furnace 41a low, so that the density | concentration of the solvent vapor | steam in the 1st to-be-processed gas G1 is high.

  On the other hand, the lower the concentration of solvent vapor in the first gas to be treated G1, the greater the amount of organic solvent remaining in the coating part 14 after the first drying step. As the amount of the organic solvent remaining in the coating unit 14 increases, the amount of heat required for volatilizing the organic solvent in the second drying step increases. For this reason, the control part 41b performs control which raises the internal temperature of the drying furnace 41a, so that the density | concentration of the solvent vapor | steam in the 1st to-be-processed gas G1 is low.

  The press device 25 of the production facility 20 is disposed on the downstream side of the first drying device 31 in the transport direction D of the long metal foil 13. The press apparatus 25 includes a pair of press rolls 25a that sandwich both coating parts 14 from the thickness direction. By the pressing process, each coated portion 14 is compressed from the surface to the inside until a predetermined density is reached. After the pressing step, the electrode material 15 is taken up on the take-up reel 23.

Next, the effect | action of this embodiment is demonstrated with the manufacturing method of the electrode 10. FIG.
In the coating process, the active material mixture is continuously applied to each surface of the long metal foil 13 fed from the supply reel 22 from the coating device 21, and the electrode material 15 is manufactured. The electrode material 15 passes through the first drying device 31 and the first drying process is performed. The internal temperature of the drying furnace 31a is about 100 ° C., and most of the organic solvent contained in the coating part 14 evaporates, and the curing of the binder is started by heat, and the active material and the conductive auxiliary agent are fixed to each other. . The first gas to be treated G1 generated in the drying furnace 31a is discharged from the first exhaust path 32 to the outside of the drying furnace 31a. A part of the discharged first gas to be treated G1 is sent from the first exhaust passage 32 to the second drying device 41, and is sent from the first gas supply passage 33 to the solvent recovery device 50.

  The concentration of the solvent vapor in the first gas to be treated G1 is measured by the concentration measuring device 61. The control unit 41 b of the second drying device 41 controls the internal temperature of the drying furnace 41 a of the second drying device 41 to a temperature suitable for drying of the coating unit 14 based on the measurement result of the concentration measuring device 61.

  The electrode material 15 taken up on the take-up reel 23 through the first drying step is placed in the drying furnace 41a of the second drying device 41, and the second drying step is performed. In the second drying step, a slight amount of organic solvent remaining in the coating unit 14 and moisture absorbed from the surrounding air are volatilized. The second gas to be treated G2 is sent from the second gas supply path 42 to the solvent recovery device 50.

  In the solvent recovery device 50, the first gas to be processed G 1 sent from the first gas supply path 33 is introduced into the adsorption zone 54 a of the rotor 53. Then, the solvent vapor contained in the first gas to be treated G1 is adsorbed by the adsorbent, the first gas to be treated G1 is cleaned, and the treated gas G is discharged from the adsorption zone 54a. The treated gas G is discharged from the discharge path 36 to the atmosphere.

  The adsorption rotor 51 rotates, and the adsorption zone 54a is disposed at a position facing the second gas supply path 42, and is changed to the desorption zone 54b. Then, the second gas to be processed G2 sent from the second gas supply path 42 is introduced into the desorption zone 54b.

  In addition, before the 2nd to-be-processed gas G2 is supplied to the desorption zone 54b, when the 2nd to-be-processed gas G2 is not the temperature suitable for desorption, it adjusts to the temperature suitable for a desorption by the thermal storage or heat_generation | fever in the chemical heat pump 60. Is done.

  The desorption zone 54b is introduced with the second gas to be treated G2 having a temperature higher than that of the first gas to be treated G1, so that the solvent vapor is desorbed from the adsorbent and the desorption gas G3 containing the solvent vapor is discharged. Is done. Thereby, the adsorbent is regenerated. The zone 54 containing the regenerated adsorbent is arranged at a position facing the first gas supply path 33 by the rotation of the adsorption rotor 51. Further, the desorption gas G3 is returned to the first drying device 31 via the circulation path 35.

According to the above embodiment, the following effects can be obtained.
(1) In the electrode manufacturing apparatus, the first gas to be processed G1 generated in the first drying device 31 is introduced into the adsorption zone 54a by the first gas supply path 33, and becomes the first gas to be processed G1 in the adsorption zone 54a. The contained solvent vapor is adsorbed on the adsorbent. Further, the second gas to be treated G2 generated in the second drying device 41 is introduced into the desorption zone 54b by the second gas supply path 42, and the solvent vapor adsorbed by the adsorbent in the desorption zone 54b is desorbed from the adsorbent. Is done. Therefore, the thermal energy of the second gas to be processed G2 generated in the second drying device 41 can be used for desorption of the adsorbent. Therefore, it is not necessary to reheat the first gas to be treated G1 discharged from the first drying device 31 for desorption of the adsorbent, and there is no equipment for reheating and a reheating process, so that the electrode manufacturing apparatus Equipment costs and operating costs can be reduced.

  (2) The chemical heat pump 60 that adjusts the temperature of the second gas to be processed G2 flowing through the second gas supply path 42 is provided. The temperature of the second gas to be treated G2 can be adjusted to a temperature suitable for desorbing the solvent vapor from the adsorbent by the chemical heat pump 60. By using the chemical heat pump 60, a thermometer for measuring the temperature of the second gas to be processed G2 and an apparatus for adjusting the temperature of the second gas to be processed G2 are not required, and the equipment cost of the electrode manufacturing apparatus can be suppressed.

  (3) The concentration measuring device 61 measures the concentration of the solvent vapor in the first gas to be treated G1, and the control unit 41b of the second drying device 41 uses the second drying device based on the measurement result of the concentration measuring device 61. The internal temperature of 41 is controlled. For this reason, internal temperature can be controlled to the temperature required for the drying in the 2nd drying apparatus 41, and consumption of useless energy can be suppressed.

In addition, you may change the said embodiment as follows.
○ The concentration measuring device 61 may be omitted.
○ The chemical heat pump 60 may be omitted.

The temperature adjustment of the second target gas G2 may be performed using a thermometer that measures the temperature of the second target gas G2 or a device that adjusts the temperature of the second target gas G2.
The zone 54 of the adsorption rotor 51 may be divided into two, an adsorption zone 54a and a desorption zone 54b, or may be divided into three or four or more.

  The solvent recovery device 50 may not include the rotating adsorption rotor 51. After the first treated gas G1 is introduced to the adsorbent and the solvent vapor is adsorbed, the second treated gas G2 is introduced to the adsorbent and the solvent vapor is desorbed to regenerate the adsorbent. You may make it perform.

  O The coating method of the active material mixture by the coating device 21 may be intermittent coating instead of continuous coating. Alternatively, the coating device 21 may be disposed opposite to only one side of the long metal foil 13, and the active material mixture may be applied only to one side of the long metal foil 13.

  (Circle) you may arrange | position a flow regulating valve to the 1st gas supply path 33, and may adjust the flow volume of the 1st to-be-processed gas G1 sent to the solvent collection | recovery apparatus 50. FIG. Further, a flow rate adjustment valve may be disposed in the second gas supply path 42 to adjust the flow rate of the second gas to be processed G2 sent to the solvent recovery device 50.

  A current collector for an electrode is not limited to the long metal foil 13 as long as the active material mixture can be applied. For example, a woven or net-like sheet may be used.

  G1 ... first treated gas, G2 ... second treated gas, 10 ... electrode, 13 ... long metal foil as current collector, 31 ... first drying device, 31a ... drying furnace, 33 ... first gas supply , 41 ... second drying device, 41b ... control unit, 42 ... second gas supply passage, 50 ... solvent recovery device, 54a ... adsorption zone as adsorption unit, 54b ... desorption zone as desorption unit, 60 ... chemical heat pump 61 ... Concentration measuring device.

Claims (3)

A first drying device for heating and drying an active material mixture applied to a current collector for an electrode of a lithium ion secondary battery;
A second drying device for drying the active material mixture dried by the first drying device at a temperature higher than the heating temperature by the first drying device;
A first treated gas containing solvent vapor generated when the active material mixture is heated and dried by the first drying device is introduced, and the solvent vapor contained in the first treated gas is adsorbed to an adsorbent. A solvent recovery apparatus comprising: an adsorbing unit that collects the solvent vapor by allowing the adsorbent to desorb the solvent vapor adsorbed on the adsorbent;
A first gas supply path for introducing a first gas to be processed generated when the active material mixture is heated and dried by the first drying device into the adsorption unit;
An electrode manufacturing apparatus, comprising: a second gas supply path for introducing a second gas to be processed generated when the active material mixture is heated and dried by the second drying apparatus into the desorption section.   The electrode manufacturing apparatus according to claim 1, further comprising a chemical heat pump that stores heat of the second gas to be processed in the second gas supply path.   A controller for measuring a concentration of the solvent vapor contained in the first gas to be treated; and a controller for controlling an internal temperature of the second drying apparatus, wherein the solvent vapor measured by the concentration meter The electrode manufacturing apparatus of Claim 1 or Claim 2 which controls the internal temperature of the said 2nd drying apparatus according to the density | concentration.