JP2009229003A - Drying device, band-like body, battery, and battery manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying device capable of obtaining a standard dry band-like body by appropriately and accurately measuring the drying state of a coated body. <P>SOLUTION: The drying device includes a plurality of drying furnaces disposed along a conveyance path of an electrode substrate 800, and an evaporating moisture sensor provided in the drying furnace for detecting evaporating moisture from the coated body 820. The evaporating moisture sensor 200 includes an intake part 210 for taking in air and having an air intake opening part, a pipe part 220 in which air from the intake part 210 flows, and a moisture detecting part 230 provided midway of the pipe part 220 for detecting a moisture amount in air. The intake part 210 is installed directly above the coated body 820 for each line of the coated body 820 coated on the electrode substrate 800 being conveyed. The distance between the intake part 210 and the coated body 820 is the thickness of a boundary layer or less. The moisture detecting part 230 is disposed in the drying furnace along with the intake part 210. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drying apparatus, a strip, a battery, and a battery manufacturing apparatus. Specifically, the present invention relates to a drying apparatus that dries an active material-containing solution applied to an electrode substrate when manufacturing an electrode carrying an active material.

  In manufacturing a lithium ion battery, there is a drying process in which a solution containing an active material is applied to an electrode substrate that is a metal thin plate, and the applied body is dried. And in this drying process, it is made to dry so that the final moisture content of an application body may become a regulation value. If the moisture content of the coated body is out of the specified value, the electrode active material and the electrolytic solution may react chemically to generate toxic gas, or the reaction will become dull as the gas is generated, resulting in inconvenience that the standard output is not achieved. . Furthermore, if an output command is forcibly given to a battery with no output, it may generate heat and ignite.

  Here, a method and an apparatus for drying an active material-containing liquid applied to a band-shaped metal thin film to a specified moisture content are disclosed (Patent Document 1). In Patent Document 1, hygrometers are arranged in the air supply duct and the exhaust duct. Then, the amount of water evaporated from the application body is measured by calculating the difference between the amount of water vapor being supplied and the amount of water vapor being exhausted. By looking at this measured value, the amount of water evaporated from the coated body is feedback controlled, and the final moisture content is set to a specified value.

JP-A-5-50023

In patent document 1, the hygrometer which measures the evaporating water from an application body is installed in the exhaust duct. Since it is necessary to accurately measure the amount of evaporated water in order to make the final moisture content the specified value, there is a great advantage in measuring the amount of water vapor in the exhaust by installing a hygrometer in the exhaust duct. You might also say that.
However, when a hygrometer is installed in the exhaust duct, since the distance from the application body to the hygrometer is long, it takes time for the evaporated water to reach the hygrometer. Then, even if it feeds back based on a measured value, the problem that it is no longer in time arises.
In addition, a non-standard region where the moisture content of the coated body has deviated from the specified value is unsuitable as an electrode and is discarded. However, when the moisture content in the exhaust gas is measured from time to time in the exhaust duct, the moisture content evaporated from a wide range is measured. It is difficult to specify the above, and eventually a considerable part may be discarded.

An object of the present invention is to provide a drying apparatus that accurately and accurately measures the dry state of an applied body to obtain a standard dry strip.
Moreover, the objective of this invention is providing the manufacturing apparatus of a battery which manufactures a high quality battery using this drying apparatus.
Furthermore, the objective of this invention is providing the high quality dry strip | belt body obtained by this drying apparatus, and a battery.

  In the drying apparatus of the present invention, a belt-like body in which one or a plurality of lines of a coating body is applied on a belt-like base material is continuously fed, and the coating body passes through the predetermined transport path while the belt-like body passes through a predetermined transport path. A drying apparatus that dries the water to a predetermined moisture content, and is provided in a plurality of drying furnaces arranged along a transport path of the belt-like body, and in at least two or more of the drying furnaces. An evaporating moisture sensor for detecting evaporating moisture from the application body, wherein the evaporating moisture sensor includes an intake portion having an intake opening for taking in air, a piping portion for conducting air from the intake portion, and A moisture detector provided in the middle of the piping portion for detecting the amount of moisture in the air, and the intake portion is provided for each line of the application body applied to the belt-like body being conveyed. Installed directly above And features.

  In such a configuration, the belt-like body to which the application body is applied is sequentially conveyed through the drying furnace of the drying device, and during that time, moisture evaporation is promoted from the application body so that the moisture content of the application body becomes a specified value. To be dried. Some drying furnaces that pass in the middle of transporting the belt-like body are provided with an evaporated moisture sensor, and the evaporated moisture sensor detects the evaporated moisture from the application body. Most of the water that evaporates from the application body diffuses into the drying furnace, while part of the evaporating water flows with the airflow that forms on the surface of the belt-like body, and enters the intake of the evaporative moisture sensor installed directly above the application body. Reach. Then, a part of the evaporated water is taken together with the air from the intake opening of the intake part, and is detected by the moisture detection part through the pipe part.

  According to such a configuration, since the intake portion of the evaporating moisture sensor is disposed immediately above the line of the application body, the evaporating moisture can be taken in immediately and the evaporating moisture can be detected without a time delay. In this way, the moisture evaporated from the coated body is immediately taken in and detected immediately above, so the moisture content detection accuracy is stable and accurate, and the moisture content detection based on this detection value is also highly accurate and high resolution. Can do. Then, based on the moisture content detection data obtained with high accuracy and high resolution, the drying of the belt can be controlled with high accuracy, and the specified belt can be obtained accurately.

  Further, since the evaporated moisture can be taken in immediately and detected without time delay, it is possible to feedback control the drying apparatus without delay, and it becomes more reliable to control the application body to a prescribed moisture content. Furthermore, since the path of the air flow from when the moisture of the application body evaporates until it is detected by the evaporating moisture sensor is clear, and there is no delay time from the evaporation to detection, the detected value of the sensor is It is possible to accurately identify which portion of the water content is reflected. Therefore, even if there is a part that deviates from the specified moisture content, it is possible to specify the part in detail and minimize the part to be discarded.

When a hygrometer is installed in the exhaust duct as in the past, the evaporated water is detected with a considerable time delay after being diffused by a complex air current in the drying furnace. Therefore, even if it is found from the detection value that the moisture content is outside the regulation, it is impossible to specify the area in detail, and a considerable part is discarded in consideration of safety.
In this regard, according to the present invention, it is possible to accurately specify which part of the coated body the moisture content of the sensor reflects, which contributes to improvement of product safety and manufacturing efficiency. it can. In addition, since the evaporating moisture sensor of the present invention is provided for each line of the application body, the moisture content can be detected for each line of the application body, and instead of discarding the entire area of the belt-like body, Since sorting can be performed for each line, manufacturing efficiency (yield) can be further improved.

  Conventionally, it was impossible to achieve both high quality and production efficiency, but according to the present invention, it is possible to obtain a strip that has been accurately and efficiently dried to a specified moisture content. Has a periodical effect.

  In this invention, it is preferable that the distance of the said intake part and the said application body is below the thickness of a boundary layer.

According to such a configuration, it is possible to detect the evaporated moisture by taking in the place where the moisture evaporated from the application body flows in the boundary layer along with the transport of the belt-like body from the intake portion.
If the sensor is installed in an appropriate place in the exhaust duct or drying furnace as in the past, evaporating moisture will reach the sensor after diffusing in a complex air flow, causing a time delay, Furthermore, since the evaporated water collides with the application body again, a detection value that accurately reflects the moisture content of the application body cannot be obtained.
In this regard, the amount of moisture contained in the airflow in the boundary layer reflects the moisture content of the coated body fairly accurately, so it is possible to accurately detect the moisture content of the coated body by taking in air from the boundary layer and detecting the moisture. Can be requested.

The distance between the intake portion and the application body is preferably within the thickness of the boundary layer. However, if it is difficult due to design problems, for example, the distance between the intake portion and the coated body may be within twice the thickness of the boundary layer. Good.
Although there is a possibility that the detection accuracy is somewhat lowered, the detection effect is sufficient as compared with the prior art.

  In this invention, it is preferable that the said intake part is arrange | positioned in the downstream of the conveyance path | route of the said strip | belt shaped object in a drying furnace.

According to such a configuration, it is possible to detect the moisture content after drying in the drying furnace.
In addition, since the water evaporated from the coated body often flows in the transport direction of the strip together with the air current of the boundary layer pulled by the transport of the strip, it is on the downstream side of the transport path as in the present invention. By taking in air and evaporated water, it is possible to detect evaporated water with high accuracy and high resolution.

  In this invention, it is preferable that the said moisture detection part is arrange | positioned in the said drying furnace with the said intake part.

  According to such a configuration, since the distance from the intake unit to the moisture detection unit is extremely short, the time lag from when the moisture evaporates until it is detected is extremely short.

  In the present invention, the intake opening of the intake portion has a flat rectangular shape, and the opening width thereof is wider than the line width of the application body, and the intake portion extends in the width direction immediately above the application body. It is preferable to be installed parallel to the width direction of the body.

  According to such a structure, the air containing the water | moisture content which evaporates from the line of an application body can be taken in reliably, and the detection value reflecting the moisture content of the application body can be obtained correctly.

  In the present invention, the intake portion is disposed such that the intake opening faces in the direction opposite to the transport direction of the strip, and the central axis of the intake opening is parallel to the transport direction of the strip. It is preferable to be installed in a state inclined from the direction.

  According to such a configuration, the air flowing along with the conveyance of the belt can be smoothly taken in without resistance, which contributes to obtaining a more accurate detection value.

  In this invention, it is preferable that the said piping part is formed with stainless steel or a magnetic material.

According to such a configuration, even if the material of the piping part becomes dust and adheres to the strip, the influence of the strip on the product quality can be almost eliminated. Since the evaporating moisture sensor is installed immediately above the application body, the dust generated from the evaporating moisture sensor adheres to the application body. In particular, since air flows through the piping portion of the evaporating moisture sensor, there is a high possibility that vibration will occur and dust will be generated at the connecting portion with the intake portion. Then, even if the drying itself is accurate, there is a risk that the quality of the product is rather deteriorated.
In this respect, when the piping portion is formed of stainless steel, the material quality is clear, so that the influence on the quality can be extremely reduced.
Moreover, when a piping part is formed with a magnetic material, dust can be removed with a magnetic washing machine (magnet) after drying.

The strip of the present invention is dried by the drying apparatus.
Moreover, the strip | belt state of this invention is what was dried with the said drying apparatus, Comprising: The said application body contains the active material used as the electrode of a battery, The said strip | belt body is an electrode of a battery. It is characterized by that.
And the battery of this invention uses the said strip | belt-shaped body for an electrode.
Moreover, the battery manufacturing apparatus of this invention is equipped with the said drying apparatus.

  According to the present invention, it is possible to obtain a belt-like body that is accurately and efficiently dried to a specified water content.

The best mode for carrying out the present invention will be described with reference to the drawings.
1st Embodiment which concerns on the drying apparatus of this invention is described.
FIG. 1 is a diagram illustrating a schematic configuration of the drying apparatus 100.
In FIG. 1, a strip-shaped electrode base material (strip-shaped body) 800 is sent out by a feeding device (not shown), is carried into the drying device, is sequentially transported through the drying device, and is carried out of the drying device. And when it leaves the drying apparatus 100, the electrode base material 800 is wound up in roll shape with the winding apparatus which is not shown in figure.
Note that a rotary encoder is attached to the feeding device and the winding device so that it is possible to trace which part of the electrode base material 800 is located at which point in the drying device 100 at which time.

  As shown in FIG. 1, the drying apparatus 100 includes a plurality of furnaces, and some of the plurality of furnaces are electric furnaces that heat the electrode substrate 800. The other furnace is a drying furnace 112 that feeds air and exhausts to promote drying of the electrode substrate 800. Which furnace is the electric furnace 111 and which furnace is the drying furnace 112 is arbitrary, but the first or first two furnaces into which the electrode substrate 800 is carried are the electric furnaces 111, and the other furnaces are drying furnaces. It may be 112. If it is first heated and then passed through the drying furnace 112, drying can be promoted efficiently. (In FIG. 1, the lower part is labeled as an example of the arrangement of the electric heating furnace and the drying furnace)

FIG. 2 is a perspective view of an electrode substrate 800 as an object to be dried that is dried by the drying apparatus 100.
The electrode substrate 800 includes a strip-shaped metal thin plate 810 and two application bodies 820 applied on the metal thin plate 810.
The metal thin plate 810 is made of Al, Cu, or an alloy of Al and Cu.
The application body 820 is obtained by applying a solution containing an active material to the metal thin plate 810 by a coater (coating device) (not shown).
The active material includes a metal material containing Li, carbon as a conductive material, and a binder that binds these materials and the metal thin plate 810. These are dispersed in water to form a coating solution. .
The electrode substrate 800 is dried to a specified moisture content by the drying device 100 and then cut into a predetermined size to be an electrode of a secondary battery.
At this time, when there are a plurality of lines of the application body 820 to which the active material is applied, a plurality of electrodes can be obtained in one region by cutting along the lines of the application body 820. That is, by forming a plurality of (for example, two) application bodies 820 as shown in FIG. 2, the manufacturing efficiency of the electrodes is improved in each stage as compared with the case where a single application body is simply formed on the metal thin plate 810. .

Next, the drying furnace 112 of the drying apparatus 100 will be described.
FIG. 3 is a diagram showing an internal configuration of one drying furnace 112.
The drying furnace 112 includes a partition wall 113 that partitions each furnace, an air supply unit 114 that sends air into the furnace, and an exhaust unit 115 that exhausts the air in the furnace. Further, some of the drying ovens 112 include an evaporated moisture sensor 200 that detects evaporated moisture from the application body 820.

A plurality of air supply units 114 are provided on the upstream side of the conveyance path of the electrode base material 800, and supply air into the drying furnace.
A plurality of exhaust units 115 are provided on the downstream side of the transport path of the electrode base material 800, and exhaust air in the drying furnace.
As described above, the air supply unit 114 is on the upstream side, the exhaust unit 115 is on the downstream side, and the electrode base material 800 is transported from the upstream side to the downstream side. The direction of flow from upstream to downstream.

The evaporating moisture sensor 200 does not need to be provided in all the drying furnaces 112, but how the moisture content of the application body 820 changes before the electrode base material 800 enters the drying apparatus 100 and exits. The number that can be traced needs to be installed.
The application body 820 of the electrode base material 800 has a final moisture content of a specified value, but it is necessary to adjust the drying speed to a desired speed even in the process of drying the application body 820. .
For example, if water is suddenly evaporated from the application body 820, the active material of the application body 820 is lifted together with the water, and the active material and the metal thin plate 810 are not sufficiently bonded and easily peeled off. Problem arises.
Therefore, in evaporating moisture from the coated body 820, it is necessary to reach the final moisture content while adjusting the drying speed. Therefore, the evaporating moisture sensor 200 may be installed in every other drying furnace 112 or every other drying furnace 112 so that the drying speed can be traced.

  As shown in FIG. 3, the evaporated moisture sensor 200 is disposed on the downstream side of the conveyance path of the electrode base material 800 in the drying furnace. The evaporative moisture sensor 200 includes an intake unit 210 that takes in air, a piping unit 220 that conducts air from the intake unit 210, and a moisture detection unit 230 that is provided in the middle of the piping unit 220 and detects the amount of moisture in the air. And comprising.

FIG. 4 is a perspective view of the intake portion 210.
The intake part 210 has a through hole 212 that penetrates from one end side opening (intake opening part) 211 for taking in air to the other end side opening (not shown) continuous to the piping part 220. The one end side opening 211 has a flat rectangular shape, and the opening width in the one end side opening 211 is slightly wider than the width of one application body 820. The width of the one end side opening 211 is, for example, about 10% wider than the width of the application body 820. The diameter of the through hole 212 is increased from the opening on the other end side toward the opening on the one end side, and the air widely taken in the opening on the one end side 211 is naturally collected toward the pipe portion 220 connected to the opening on the other end side. And introduced into the piping unit 220.

FIG. 5 is a perspective view of the state where the evaporating moisture sensor 200 is installed in the drying furnace, and FIG. 6 is a side view of the state where the evaporating moisture sensor 200 is installed in the drying furnace.
The intake section 210 is installed immediately above the application body 820 with the width direction parallel to the width direction of the application body 820. At this time, as shown in FIG. 6, the one end side opening 211 of the intake portion 210 is close to the application body 820 of the electrode base member 800, and the distance between the one end side opening 211 and the electrode base member 800 is the boundary layer. Or less. Thickness [delta] _L of the boundary layer air stream of the boundary layer as a laminar flow, is defined by the following equation (1).

  However, the transport speed of the electrode substrate 800 is U, the width of the electrode substrate is L, the physical property value of the atmospheric gas in the drying furnace is density ρ, the viscosity is μ, and the Reynolds number Re is defined as follows. .

Here, since the Reynolds number is usually Re ≦ 5 × 10 ⁵ and the airflow in the boundary layer is assumed to be laminar, the above formula (1) may be applied.
However, exceptionally, in the case of a design where Re> 5 × 10 ⁵ , the boundary layer becomes turbulent, so the thickness δ _{L of the} boundary layer is defined by the following equation instead of the above equation (1). .

On the other hand, if the intake portion 210 is too close to the electrode base material 800, the intake portion 210 will collide with the electrode base material 800, so the electrode base material 800 is more than the width that vibrates up and down during conveyance. The intake portion 210 is installed at a position separated from the base material 800.
In consideration of the above, the distance between the intake portion 210 and the electrode base material 800 is not specified by a specific numerical value, but for example, the distance may be 5 mm or more and 10 mm or less.

  In addition, the intake portion 210 is disposed so that the opening on the one end side faces in the direction opposite to the conveyance direction of the electrode base material 800, and the axis of the through hole 212 is inclined from a direction parallel to the conveyance direction of the electrode base material 800. It is installed in the state to let it. As the inclination angle θ, for example, 10 ° to 50 ° is given as an example, and around 30 ° is desirable.

  The piping part 220 is connected to the opening on the other end side of the intake part 210, is pulled out of the drying furnace 112, and is connected to, for example, an exhaust pump (not shown). The piping part 220 is preferably formed of SUS or a magnetic material.

  The moisture detection unit 230 is provided in the middle of the piping unit 220. It is preferable that the length of the piping portion between the moisture detection unit 230 and the intake unit 210 is as short as possible, and the moisture detection unit 230 is provided at least in the drying furnace. It is preferable that the moisture detection unit 230 has heat resistance (for example, about 200 ° C.) so that it can withstand even if the temperature in the drying furnace becomes high. The detection value detected by the moisture detection unit 230 is output to the outside and processed.

Processing of the detection value detected by the moisture detection unit 230 will be described.
The moisture detection value detected by the moisture detector 230 is output to, for example, an external host computer (not shown), and is used for calculating the moisture content of the coated body 820, feedback control of the drying device 100, and product quality control. The
Hereinafter, description will be made in order assuming that the host computer is provided with a moisture content calculation unit 910 and a central control unit 920.

The detection value detected by the moisture detection unit 230 is first sent to the moisture content calculation unit 910.
The moisture content calculation unit 910 calculates the moisture content of the application body 820 at that time using the detection value by the moisture detection unit 230.
Here, in the moisture content calculation unit 910, a data table indicating the relationship between the moisture content of the application body 820 and the detection value of the moisture detection unit 230 is set and stored, and the application body 820 is determined from the detection value based on this data. The moisture content of is calculated.
FIG. 7 is an example of a graph showing the relationship between the moisture content (vertical axis) of the application body 820 and the detection value (horizontal axis) of the moisture detection unit 230.
Naturally, if the moisture content of the application body 820 is high, the detection value of the moisture detection unit 230 also increases, and if the moisture content of the application body 820 is low, the detection value of the moisture detection unit 230 decreases. And if the resolution | decomposability of the evaporative moisture sensor 200 is high, a detection value (horizontal axis) will change a lot with respect to the slight water content change (vertical axis change). Such a graph is obtained in advance by a preliminary experiment and set in the moisture content calculation unit 910. The water content value calculated by the water content calculation unit 910 is further sent to the central control unit 920.

The central control unit 920 is set with a desired drying speed and a prescribed final moisture content of the applied body 820 of the electrode base material 800. The drying speed is calculated from the moisture content values that are sequentially sent to obtain a desired drying rate. Contrast with speed. And the temperature of an electric furnace is controlled according to the magnitude of a drying speed, or a conveyance speed is controlled. Further, when the drying speed or the final moisture content is out of the allowable value, the area is specified from the value of the rotary encoder, and the line of the coated body 820 that is out of the area and is not specified is out of specification. Set a flag to the effect.
Here, since there are a plurality of (for example, two) lines of the application body 820, all the application body lines in a certain region of the electrode base material 800 are not generally out of specification, but for each line of the application body 820. By looking at the results of the moisture content that is installed, identify the non-standard application body line. The part that is finally out of specification will be discarded instead of being a product.

In the drying apparatus 100 having such a configuration, an outline of steps from when the electrode base material 800 is fed to when it is wound up will be described.
A thin metal plate 810 wound in a roll shape is fed out, and two lines of the application body 820 are applied by a coater (not shown) (see FIG. 2).
The electrode substrate 800 coated with the application body 820 is continuously carried into the drying apparatus 100. At this time, first, the application body 820 is applied to the surface of the metal thin film, and the surface is dried at the front part (the lower part in FIG. 1) of the drying apparatus 100. Subsequently, after the application body 820 is applied to the other surface (back surface) of the thin metal plate 810, the back surface is dried in the middle portion (the middle portion in FIG. 1) of the drying apparatus 100. Finally, final drying of both the front and back surfaces is performed in the rear part of the drying apparatus 100 (upper part in FIG. 1). The electrode substrate 800 finally dried is wound up by a winding device.

The electrode base material 800 carried into the drying device 100 is first heated by an electric furnace. Then, the heated electrode base material 800 is sequentially conveyed to a plurality of drying furnaces 112 and dried. In the drying furnace, air is supplied from the air supply unit 114 on the upstream side, and air is exhausted from the exhaust unit 115 on the downstream side, and most of the water evaporated from the application body 820 is exhausted 115. Exhausted with air. Further, a part of the water evaporated from the application body 820 flows with the boundary layer flowing on the surface layer of the electrode base material 800 and reaches the intake portion 210 of the evaporated moisture sensor 200, and from the intake portion 210 together with the air in the boundary layer, from the intake portion 210. Is taken in. The moisture that has entered from the intake unit 210 is detected by the moisture detection unit 230 via the piping unit 220.
The detection value detected by the moisture detection unit 230 is output to the moisture content calculation unit 910. Then, the moisture content of the application body 820 at that time is calculated from the detected value, and the value is output to the central controller 920.
The central control unit 920 records the moisture content data sent in this way together with the area of the electrode base material 800 and the line of the coated body 820, and also records the drying speed history and final moisture content of each point. Is calculated. The electric furnace temperature and the conveyance speed are feedback controlled based on the drying speed thus obtained. In addition, the central control unit 920 puts a flag outside the standard on the region that does not satisfy the desired drying rate history and the final moisture content of the standard and the line of the application body 820.

  Of the electrode base material 800 that has finished the drying process, the coating body line in the region with the non-standard flag is discarded, and the other parts according to the standard are processed as battery electrodes and finally shipped as batteries. .

According to this embodiment having such a configuration, the following effects can be obtained.
(1) Since the intake portion 210 of the evaporated moisture sensor 200 is installed immediately above the application body 820 for each line of the application body 820 of the electrode base material 800 to be transported, the evaporated water evaporated from the application body 820 is immediately Evaporated water can be detected without time delay. As described above, the moisture evaporated from the application body 820 is immediately taken and detected immediately above, so that the moisture content detection accuracy is stable and accurate, and the moisture content detection based on this detection value is also highly accurate and high resolution. be able to.

(2) Since the distance between the intake portion 210 and the application body 820 is equal to or less than the thickness of the boundary layer, the place where the water evaporated from the application body 820 flows in the air current of the boundary layer along with the conveyance of the electrode base material 800 is introduced. Evaporated moisture can be detected by taking in from the unit 210. The amount of water contained in the air current in the boundary layer reflects the moisture content of the coated body 820 fairly accurately. Therefore, the moisture content of the coated body 820 can be accurately determined by taking in the air in the boundary layer and detecting the moisture. Can be sought.

(3) Since the evaporating moisture sensor 200 is disposed in the drying furnace on the downstream side of the transport path, the moisture content after the drying in the drying furnace can be detected. In addition, since the moisture evaporated from the application body 820 flows in the transport direction of the electrode base material 800 together with the air current of the boundary layer pulled in the transport of the electrode base material 800, the downstream side of the transport path. By taking in air and evaporating moisture at, evaporating moisture can be detected with high accuracy and high resolution.

(4) Since the moisture detection unit 230 is disposed in the drying furnace together with the intake unit 210, the moisture detection unit 230 is detected after the distance from the intake unit 210 to the moisture detection unit 230 is extremely short and the moisture has evaporated. The time lag until is extremely short.

(5) The opening 211 on the one end side of the intake portion 210 has a flat rectangular shape, and the opening width is formed wider than the width of the line of the application body 820. Is installed in parallel with the width direction of the application body 820, so that air containing moisture evaporating from the line of the application body 820 can be reliably taken in, and a detection value reflecting the moisture content of the application body 820 is obtained. Can be obtained accurately.

(6) The intake portion 210 is disposed so that the opening on the one end side faces in the direction opposite to the transport direction of the electrode base material 800, and the axis of the through hole 212 is parallel to the transport direction of the electrode base material 800. Since it is installed in a state inclined from the direction, the air current in the boundary layer can be smoothly taken in without resistance. As a result, a more accurate detection value can be obtained.

(7) Since the piping part 220 is formed of stainless steel or a magnetic material, even if the material of the piping part 220 becomes dust and adheres to the electrode base material 800, the influence on the product quality can be almost eliminated. . That is, when the pipe part 220 is made of stainless steel, the material quality is clear, so the influence on the quality can be made extremely small. Moreover, when the piping part 220 is formed with a magnetic material, dust can be removed with a magnetic washing machine (magnet) after drying.

In addition, this invention is not limited to the said embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included in this invention.
In the above-described embodiment, the case where the electrode base material is dried has been described as an example. However, the material to be dried is not limited to the electrode base material.
Although the case where two coated bodies are formed on the electrode base material has been described as an example, the number of coated bodies is not limited to this, and even if there are three or four coated bodies, evaporation is performed for each of these lines. Of course, the present invention can be applied by providing a moisture sensor.
An evaporation moisture sensor may be installed in all drying ovens. However, in order to reduce the manufacturing cost, it suffices if it is necessary.
The shape of the one end side opening is not limited to a rectangle as long as it is wider than the line width of the application body.

The figure which shows schematic structure of a drying apparatus. The perspective view of the electrode base material dried with a drying apparatus. The figure which shows the internal structure of one drying furnace. The perspective view of an intake part. The perspective view of the state which installed the evaporative moisture sensor in the drying furnace. The side view of the state which installed the evaporative moisture sensor in the drying furnace. The figure of the graph which shows the relationship between the moisture content (vertical axis) of an application body, and the detected value (horizontal axis) of a moisture detection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Drying apparatus, 111 ... Electric heating furnace, 112 ... Drying furnace, 113 ... Partition wall, 114 ... Air supply part, 115 ... Exhaust part, 200 ... Evaporation moisture sensor, 210 ... Intake part, 211 ... Opening at one end side (intake opening part) , 212 through-hole, 220 through piping, 230 moisture detector, 800 electrode substrate, 810 metal thin plate, 820 applied body, 910 moisture content calculating unit, and 920 central control unit.

Claims (11)

A belt-like body in which an application body of one or a plurality of lines is applied on a belt-like base material is continuously fed, and the coating body is dried to a predetermined moisture content while the belt-like body passes a predetermined transport path. A drying device for causing
A plurality of drying furnaces arranged along the transport path of the strip,
An evaporative moisture sensor that is provided in at least two of the plurality of drying ovens and detects evaporating moisture from the application body, and
The evaporative moisture sensor is
An intake having an intake opening for taking in air;
A piping section for conducting air from the intake section;
A moisture detector provided in the middle of the piping part for detecting the amount of moisture in the air,
The said intake part is installed in the just upper part of the said application body for every line of the said application body currently apply | coated to the said strip | belt-shaped body in conveyance. The drying apparatus characterized by the above-mentioned. The drying apparatus according to claim 1, wherein
The distance between the said intake part and the said application body is below the thickness of a boundary layer. The drying apparatus characterized by the above-mentioned. The drying apparatus according to claim 1 or 2,
The said intake part is arrange | positioned in the drying furnace in the downstream of the conveyance path | route of the said strip | belt shaped object. The drying apparatus characterized by the above-mentioned. In the drying apparatus in any one of Claims 1-3,
The said moisture detection part is arrange | positioned in the said drying furnace with the said intake part. The drying apparatus characterized by the above-mentioned. The drying apparatus according to any one of claims 1 to 4,
The intake opening of the intake portion has a flat rectangular shape, and the opening width is wider than the line width of the application body,
The drying device is characterized in that the intake portion is installed with the width direction parallel to the width direction of the application body immediately above the application body. In the drying apparatus in any one of Claims 1-5,
The intake portion is disposed such that the intake opening faces in the direction opposite to the transport direction of the strip, and the central axis of the intake opening is inclined from a direction parallel to the transport direction of the strip. The drying apparatus is characterized by being installed in a wet state. The drying apparatus according to any one of claims 1 to 6,
The said piping part is formed with stainless steel or a magnetic material. The drying apparatus characterized by the above-mentioned.   A belt-like body dried by the drying apparatus according to any one of claims 1 to 7. A band-shaped body dried by the drying apparatus according to any one of claims 1 to 7,
The coated body includes an active material that becomes an electrode of a battery,
The band-shaped body is an electrode of a battery.   A battery using the strip according to claim 9 as an electrode.   A battery manufacturing apparatus provided with the drying apparatus in any one of Claims 1-7.

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