JP2002025541A - Manufacturing method and manufacturing device of electrode plate for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing device of an electrode plate for a battery, in which the weight of paste-formed active substance to be applied on a core material is continuously measured without influenced by dispersions of the weight of the core material and wherein the paste-formed active substance can be coated without dispersions of the weight of the core material in a longitudinal direction and in a widthwise direction. SOLUTION: On the surface of the band-shaped core material 1 for current-collection, which is continuously conveyed, an active substance layer is formed by coating a paste-shaped active substance 12 supplied from a quantitative pump 13 with an active substance applicator 14. By irradiating plural kinds of radioactive rays 32, 33 which are different in transmittance on the core material 18 coated with the active substance, the weight of the active substance layer is measured based on the transmission amount of the respective radioactive rays 32, 33. Errors between weight data and reference data of the active substance layer are calculated and at least either of a revolution number of the quantitative pump or a distance d between a slit nozzle part 14a and the core material 1 is feedback-controlled so that the errors will be within a set up range based on the weight data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode plate for a battery, comprising forming an active material layer by applying a paste-like active material to the surface of a current collecting core material such as a metal foil or a punching metal. And a method and apparatus for performing the method.

[0002]

2. Description of the Related Art In recent years, portable and cordless electric devices such as AV devices, personal computers, and portable communication devices have been rapidly promoted. As a power source for driving these electric devices, nickel cadmium batteries have conventionally been used. And nickel-metal hydride batteries have been mainly used. In recent years, non-aqueous electrolytes (organic solvent-based ones) represented by lithium ion secondary batteries, which can be rapidly charged, have a high energy density, and have high safety, have been used in recent years. (Electrolyte) Secondary batteries are becoming mainstream. The electrode plate of this non-aqueous electrolyte secondary battery is generally
On the surface of the current collector core material such as metal foil or punched metal,
A paste-like active material obtained by dispersing and kneading a positive electrode active material powder or a negative electrode active material powder in a binder dissolved in a solution is applied to a predetermined thickness to form an active material layer, and the active material layer is dried. After being solidified, it is cut into predetermined dimensions and manufactured.

Conventionally, when a paste-like active material is applied to a current-collecting core material, the current-collecting core material is passed through the paste-like active material stored in the container and pulled up, so that the paste-like active material adheres. A method is generally employed in which the collected core material is passed through a slit plate disposed above the container to adhere the paste-like active material to a predetermined thickness. The applied thickness of the paste-like active material is likely to vary depending on the viscosity and density of the paste-like active material, in addition to the gap between the slits of the slit plate and the lifting speed of the core material. When the thickness (weight) of the active material varies as described above, the quality of the battery deteriorates.

[0004] Therefore, conventionally, after the paste-like active material is dried, an arbitrary portion is extracted to a predetermined size, and the weight of the extracted sample is measured by a mass meter to obtain a unit of the strip-shaped electrode plate. Calculate the weight per area,
Based on the calculation result, the gap between the slits of the slit plate and the pulling speed of the core material are controlled so that the thickness of the active material layer becomes a predetermined value. However, in this weight measurement method,
Since it is not possible to continuously measure the weight while transporting the belt-shaped core material in the longitudinal direction, there is a disadvantage that it is inefficient and the measurement accuracy is low.

Therefore, in recent years, a paste-type strip-shaped electrode plate in which a paste-like active material is applied to a strip-shaped core material is irradiated with β-rays as radiation, and the transmitted radiation intensity is measured. An error is calculated by comparing and calibrating with a reference value obtained in advance by the sample, and an electric signal of the calculated result is transmitted to adjusting means for adjusting the interval between a pair of blades constituting the slit for controlling active material application control. There has been proposed a method for applying a paste-like active material in which the slit is constantly adjusted so that the amount of the active material applied is close to a reference value (JP-A-8-96).
No. 806).

[0006]

However, the above-mentioned method for applying a base-like active material has the advantage that the weight can be measured continuously, but does not take into account any variation in the weight of the core material in the longitudinal direction. Therefore, there is a problem that the measurement accuracy of the weight of the active material layer is low. In particular, in an electrode plate having a high ratio of the weight of the core material per unit area, the measurement accuracy of the active material is further reduced due to the influence of the variation in the weight of the core material. In addition, the above-described coating method has another disadvantage that the width of the core material in the active material layer in the width direction cannot be controlled, and a highly accurate battery electrode plate cannot be manufactured with high yield.

In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and the weight of the paste-like active material applied to the core material is continuously adjusted without being affected by the variation in the weight of the core material. It is an object of the present invention to provide a method and an apparatus for manufacturing a battery electrode plate which can measure and apply a paste-like active material without variation in weight in the longitudinal direction and the width direction of a core material.

[0008]

In order to achieve the above object, a method of manufacturing a battery electrode plate according to a first aspect of the present invention is to provide a method for manufacturing a battery electrode plate while continuously transferring a belt-shaped current collector core at a predetermined speed. On the surface of the current-collecting core material, a paste-like active material supplied from a metering pump is applied by an active material applicator to form an active material layer, and the active material layer is dried, and then the active material is applied. The core material is irradiated with a plurality of types of radiation having different transmittances, and after measuring the weight of the active material layer based on the amount of transmission of each radiation, the weight data of the active material layer and a predetermined active material layer An error from the reference data based on the weight of the paste is calculated, and the number of revolutions of the metering pump is feedback-controlled based on the weight data so that the error falls within a set range. Automatic adjustment of material supply It is characterized in.

In this method of manufacturing a battery electrode plate, a paste-like active material is applied to the surface of the current-collecting core material while continuously transferring the belt-like current-collecting core material to form an active material layer. Forming
After drying and solidifying the active material layer, the active material-coated core material is irradiated with a plurality of radiations, and the weight can be continuously measured based on the transmission amount of each radiation. In addition, since the weight measurement is performed using a plurality of types of radiation having different transmittances, the weight of the entire active material layer including the core is determined using high transmittance radiation. The weight can be obtained, and the weight of the active material layer alone can be calculated by subtracting the weight of the core material from the total weight. Therefore, it is possible to accurately obtain the weight of only the active material layer while eliminating the influence of the variation in the weight of the core material in the longitudinal direction. In addition, since the rotation speed of the metering pump is feedback-controlled so that the error between the weight data of the active material layer and the reference data is within a set range, the application weight per unit area of the paste-like active material is transferred at a constant speed. It can be automatically adjusted so as to be constant especially in the longitudinal direction of the core material for current collection.

In a second aspect of the present invention, there is provided a method for manufacturing a battery electrode plate, wherein a constant-rate pump is provided on the surface of the current-collecting core while continuously transferring the belt-shaped current-collecting core at a predetermined speed. The active material layer is formed by discharging and applying the paste active material supplied from a slit nozzle portion having an opening length equivalent to at least the width of the current collecting core material in the active material coating machine. After irradiating the active material coated core material after drying the active material layer with two or more types of radiation having different transmittances, and measuring the weight of the active material layer based on the amount of transmission of each radiation. An error between the weight data of the active material layer and reference data based on a predetermined weight of the active material layer is calculated, and the slit nozzle unit is configured such that the error is within a set range based on the weight data. Feed the gap with the current collector core Tsu is characterized in that so as to click control.

In this method of manufacturing a battery electrode plate, as in the first invention, the weight can be continuously measured based on the amount of transmission of each radiation, and the influence of weight variation in the longitudinal direction of the core material is eliminated. The weight of only the active material layer can be accurately obtained.
Further, since the gap between the slit nozzle portion and the current collecting core material is feedback-controlled so that the error between the weight data of the active material layer and the reference data is within the set range, the paste-like active material discharged from the slit nozzle portion is controlled. The application weight per unit area of the substance can be automatically controlled so as to be constant, particularly in the width direction of the current collecting core material transferred at a constant speed.

Further, the method of manufacturing a battery electrode plate according to the third invention is characterized in that a constant-rate pump is provided on the surface of the current-collecting core while continuously transferring the belt-shaped current-collecting core at a predetermined speed. The active material layer is formed by discharging the paste-like active material supplied from a slit nozzle portion having an opening length at least equivalent to the width of the current collecting core material in the active material coating machine. After irradiating the active material-coated core material after drying the layer with two or more types of radiation having different transmittances and measuring the weight of the active material layer based on the amount of transmission of each radiation, the active material An error between the weight data of the layer and a predetermined reference data based on the weight of the active material layer is calculated, and the number of rotations of the metering pump and the slit nozzle unit are set so that the error is within a set range based on the weight data. And the core material for current collection Is characterized in that the septum of such a feedback control, respectively.

In this method of manufacturing a battery electrode plate, as in the first and second aspects, the weight can be continuously measured based on the transmission amount of each radiation, and the influence of the weight variation in the longitudinal direction of the core material can be reduced. It is possible to accurately obtain the weight of only the active material layer by excluding it. In addition, feedback control of the number of rotations of the metering pump and the interval between the tip discharge port of the slit nozzle and the current collector core so that the error between the weight data of the active material layer and the reference data is within the set range. Therefore, the application weight per unit area of the paste-like active material can be automatically controlled to be constant in both the longitudinal direction and the width direction of the current collecting core material transferred at a constant speed.

On the other hand, the apparatus for manufacturing a battery electrode plate according to the present invention comprises a transfer means for continuously transferring a strip-shaped current collector core at a predetermined speed, and an opening having at least a width equal to the width of the current collector core. An active material applicator that discharges a paste-like active material from a slit nozzle portion having a length to form an active material layer on the surface of the current collector core, and forms the active material applicator with the slit nozzle portion; A moving body that moves in a direction in which the distance from the current-collecting core material changes; a metering pump that supplies a paste-like active material to the active material coating machine; and an active material coating after passing through the active material coating machine. A drying furnace for drying the active material layer in the core material, and irradiating the active material-coated core material that has passed through the drying furnace with a plurality of types of radiation having different transmittances, based on the transmission amount of each radiation. A weight measuring device for measuring the weight of the active material layer, After comparing the weight data of the active material layer with the reference data based on the weight of the active material layer determined in advance and calculating the error, the error is within a set range based on the weight data. And a controller for performing feedback control on the rotation speed of the metering pump and the position of the moving body.

With this battery electrode plate manufacturing apparatus, any of the battery electrode plate manufacturing methods according to the first to third aspects can be faithfully embodied, and the effects of the manufacturing method can be reliably obtained.

In the manufacturing apparatus of the present invention, it is preferable that the weight measuring device is configured to irradiate at least β-rays and X-rays to the active material coated core material. This allows
It is possible to accurately determine the weight of the entire active material coated core material based on the amount of transmission of β rays having extremely high permeability to the substance,
The weight of only the core material can be obtained based on the amount of transmission of X-rays having low transmittance, and the weight of only the active material layer can be calculated with high accuracy by subtracting the weight of the core material from the total weight.

The source of β rays in the above configuration is krypton.
Preferably it is 85. This improves the permeability of the β-rays to the core material coated with the active material, thereby improving the measurement accuracy of the weight per unit area.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
It is a schematic structure figure showing the manufacturing device which materialized the manufacturing method of the battery electrode plate of the present invention. For example, the current collecting core 1 made of a band-shaped metal foil is wound in a coil shape around the unwinding machine 2, unwound from the unwinding machine 2 by the winding force of the winding machine 3, and transferred at a constant speed. While the active material layer is formed on one side, it is finally wound up again by the winder 3 in a coil shape. The active material coated core material 18 having the active material layer formed only on one surface thereof is detached from the winding device 3 and attached to the unwinding device 2, and then the active material layer 18 is formed on the other surface in the same manner as described above. Are formed to form a strip-shaped electrode plate. The strip-shaped electrode plate is cut into a predetermined size to form a desired battery electrode plate.

The current collecting core material 1 unwound from the unwinding machine 2 is transported while being guided by guide rollers 4, 7, 8 and wound around a rotating drum 9. An active material coating device 10 is installed in the vicinity of the rotating drum 9. In the active material coating device 10, a paste-type active material 12 filled in a hopper 11 is driven by a metering pump 13. 14 is supplied in a fixed amount. The active material applicator 14 discharges the supplied paste-like active material 12 from the slit nozzle portion 14a at the tip of the active material applicator 14, and applies the paste-like active material 12 onto one surface of the current collecting core material 1 which is transferred while being wound around the rotating drum 9. Apply in layers. As a result, an active material layer is formed on the surface of the current collecting core 1. In addition, the slit nozzle part 1
The discharge port 4a has an opening length equivalent to the width of the current collecting core material 1.

The active material-coated core material 18 having an active material layer formed on one side is introduced into a drying furnace 17 and dried, and the solvent in the paste-like active material 12 is heated and evaporated, whereby the active material is evaporated. The layer is securely fixed to the current collecting core 1. The active material coated core material 18 that has exited from the drying furnace 17 is
After being guided to 9, 20, and 21 and guided to the weight measuring device 22, the weight of the device itself is measured by the weight measuring device 22, and then guided by the guide roller 23 and taken up by the winder 3.

FIG. 2 is a schematic structural view showing the weight measuring device 22. The weighing device 22 includes a pair of upper and lower detection heads 24 and 27. The lower detection head 27 has a built-in β-ray source 28 and an X-ray source 29, and the upper detection head 24 Are β-rays 32 and X-rays 33
The ionization chambers 30 and 31 which are the respective receivers are built in. The β-ray 32 and the X-ray 33 radiated from the β-ray source 28 and the X-ray source 29 are irradiated on the active material-coated core 18 and pass through the active material-coated core 18 to face the ionization chamber. Light is incident on 30, 31.

Each of the ionization chambers 30 and 31 is formed of a box having a lower end opening closed by a thin film that transmits β-rays 32 and X-rays 33, respectively, and a selected appropriate gas is sealed therein. In addition, the central electrode and the peripheral electrode are arranged concentrically, and a predetermined DC voltage is applied between the central electrode and the peripheral electrode.
Therefore, β transmitted through the active material coated core material 18 respectively
The lines 32 and the X-rays 33 enter the box from the thin film below the corresponding ionization chambers 30, 31, and ionize the gas according to the amount of incidence. These ions are collected at both the central and peripheral electrodes, extracted as ionization current from the output end via the individual lines 34 and 37, and output to the controller 3 in FIG.
8 is input. Here, as the β-ray source 28 of the β-ray 32 of the two types of radiation applied to the active material-coated core material 18, one having excellent transparency is preferable, for example, krypton.
85 is suitable.

The apparatus for manufacturing the battery electrode plate of FIG. 1 will be described again. Ionization current outputs proportional to the transmitted β-rays and the transmitted X-rays from the ionization chambers 30 and 31 are input to a controller 38, and are processed by a processing unit built in the controller 38 to apply active material. It is converted into the weight data of only the active material layer in the core 18. Further, the arithmetic processing unit compares the calculated weight data of the active material layer with reference data based on a predetermined weight of the active material layer, and calculates an error thereof.

More specifically, prior to the operation of the manufacturing apparatus,
A reference sample of a plurality of types of active material coated core materials 18 having different thicknesses of the active material layers was obtained in advance, and β-ray 3
2 and X-rays 33, respectively, and the data of the relation between the radiation intensity of each of the transmitted β-rays and the transmitted X-rays, the total weight of the active material coated core material 18 and the weight of only the current collecting core material 1 is obtained. Based on this data, an equation for calculating the weight of only the active material layer from the intensities of the transmitted β-rays and the transmitted X-rays, that is, two types of ionization current outputs, is calculated and stored in the controller 38. Have been.

More specifically, since the β-ray 32 emitted from the krypton 85 has a small difference in the mass absorption coefficient depending on the substance, the ionization current output proportional to the transmitted β-ray can be reduced by the active material including the current collecting core 1. It is converted into the weight data of the whole material coated core material 18. On the other hand, the ionization current output proportional to the transmitted X-ray is converted to the weight data of only the current collecting core 1 because the transmittance of the X-ray 33 is much smaller than that of the β-ray 32.
That is, an equation for calculating the weight of the entire active material coated core material 18 is obtained from the intensity of the β-ray 32 before and after transmission and the mass absorption coefficient thereof, and the intensity and the transmission of the X-ray 33 before transmission. An equation for calculating the weight of only the current-collecting core material 1 is obtained from the subsequent strength and the mass absorption coefficient. Therefore, the weight of only the current-collecting core material 1 is subtracted from the total weight of the active material-coated core material 18. Thus, the weight of only the active material layer can be obtained. The controller 38 stores therein an equation for calculating the weight of only the active material layer obtained as described above.

Therefore, in this battery electrode plate manufacturing apparatus, the weight measuring device 22 is moving at a constant speed by using the β-ray 32 and the X-ray 33 which are two kinds of radiation having different transmittances to the substance. Since the weight measurement of the active material coated core 18 can be continuously performed, the controller 38 calculates the weight data of only the active material layer excluding the current collecting core 1 in the active material coated core 18. An error between the calculated weight data and reference data based on a predetermined weight of the active material layer is calculated by calculation. Therefore, the calculated error is highly accurate without being affected by weight variation in the length direction of the current collecting core 1. The controller 38 always performs feedback control of the active material coating device 10 based on the above-mentioned weight data so that the error falls within a set range. The feedback control for the active material coating device 10 will be described later.

The measurement accuracy of the active material layer by the above-mentioned weight measuring device 22 was evaluated, and this will be described.
A paste active material 12 obtained by mixing graphite as a negative electrode active material, butadiene styrene methacrylate copolymer latex, and a binder and adjusting the mixture to an aqueous solution of carboxymethyl relulose is formed of a 14 μm-thick copper foil. The collector core material 1 is coated over a coating range of 468 mm in width and 525 mm in length per coating portion for about 300 m to form a negative electrode active material layer on the collector core 1. After drying this active material layer,
The sheet was cut into 10 rows, and further cut into predetermined dimensions to produce a negative electrode plate, and the weight of the negative electrode active material layer of the negative electrode plate was measured by the weight measuring device 22 of the above embodiment.

On the other hand, for comparison, the weight of the negative electrode active material layer of the same negative electrode plate as above was measured by a conventional weight measuring device using only β rays. Thereafter, the active material layer of the negative electrode side electrode plate was scraped off, the weight of only the current collector core material 1 was actually measured, and the current collector core material was obtained from the weight data obtained by the conventional weight measuring device previously measured. By subtracting the weight of 1, the weight of the negative electrode active material layer as a comparative example was calculated.

When the weight data of the negative electrode active material layer measured by the weight measuring device 22 of the above embodiment and the weight data of the comparative example were compared, the weight data of the comparative example showed an error variation of as much as 3.2%. On the other hand, in the weight data of the weight measuring device 22 of the embodiment, the variation of the error is slightly
0.7%. Thus, the weight measuring device 22 of the embodiment eliminates the influence of the weight variation of the current collecting core 1 by using two types of radiation having different transmittances between the β-ray 32 and the X-ray 33. It was confirmed that the weight of the active material layer alone could be measured very accurately.

FIG. 3 is a schematic diagram showing a main part of a manufacturing apparatus embodying the method for manufacturing a battery electrode plate according to the first embodiment of the present invention. The same components are denoted by the same reference numerals. In this embodiment, the controller 38 controls the drive motor 39 of the metering pump 13 based on the weight data measured by the weight measuring device 22 such that an error between the weight data and predetermined reference data falls within a set range. The number of revolutions is feedback controlled. As a result, the feed rate of the paste-like active material 12 to the active material applicator 14 by the metering pump 13 is feedback-controlled based on the weight data, so that the applied weight per unit area of the paste-like active material 12 is transferred at a constant speed. The current collecting core 1 is automatically adjusted to be constant particularly in the longitudinal direction.

FIG. 4A is a schematic plan view showing a main part of a manufacturing apparatus embodying a method for manufacturing a battery electrode plate according to a second embodiment of the present invention, and FIG. 4B is a schematic front view thereof. And
In the same part, the same or equivalent components as those in FIG. 1 are denoted by the same reference numerals. In this embodiment, the support 40 on which the active material coating machine 14 is mounted is fixed on a moving body 42 that moves along a guide rail 41, and the moving body 42 moves in the direction of the arrow to apply the active material. The distance d between the discharge end of the slit nozzle portion 14a of the machine 14 and the core material 1 for current collection transferred while being wound around the rotating drum 9 can be adjusted. And the controller 38
Based on the weight data measured by the weight measuring device 22, the moving body 42 is moved so that an error between the weight data and predetermined reference data falls within a set range, and the interval d is feedback-controlled. As a result, the application weight per unit area of the paste-like active material 12 discharged from the slit nozzle portion 14a is automatically controlled so as to be constant particularly in the width direction of the current collecting core material 1 transferred at a constant speed. You.

FIG. 5 is a structural view showing a main part of a manufacturing apparatus embodying a method for manufacturing a battery electrode plate according to a third embodiment of the present invention. In FIG. 5, FIG. FIG.
The same or equivalent components are denoted by the same reference numerals. In this embodiment, the application weight of the paste-like active material 12 is feedback-controlled using the control means of the first and second embodiments in combination. That is, the controller 38 operates the metering pump 13 based on the weight data measured by the weight measuring device 22 such that the error between the weight data and the reference data based on the weight of the active material layer is within a set range. The number of rotations of the drive motor 39 and the distance d between the distal end outlet of the slit nozzle portion 14a and the current collecting core 1 are feedback-controlled. Thereby, the application weight per unit area of the paste-like active material 12 is automatically controlled so as to be constant in both the longitudinal direction and the width direction of the current collecting core material 1 transferred at a constant speed.

Next, evaluation by feedback control of the applied weight of each paste-like active material 12 in the first to third embodiments will be described. The above-described negative electrode plate is manufactured by automatically adjusting the application weight of the paste-like active material 12 while performing the feedback control of each of the first to third embodiments, and the three types of negative electrodes thus manufactured are manufactured. The variation in the coating weight in the longitudinal direction and the width direction of the active material layer on the side electrode plate was measured. On the other hand, as a comparative example, a paste-like active material was applied without performing automatic weight control to produce the above-described negative electrode plate, and each of the active material layer in the negative electrode plate in the longitudinal direction and the width direction was formed. The variation in coating weight was measured.

First, regarding the variation of the coating weight in the longitudinal direction, the negative electrode plate of the comparative example had 3.8% while the negative electrode plate of the comparative example had 3.8%.
By automatically controlling the supply amount of the paste-like active material 12 by the metering pump 13, the amount was reduced to 1.4%, and the negative electrode plate manufactured according to the second embodiment was lower than that of the comparative example and the first electrode plate was lower. It is 2.1%, which is slightly higher than that of the third embodiment, and the negative electrode plate manufactured by the third embodiment is
2 in addition to the automatic control of the supply amount, the slit nozzle portion 14a
Has been reduced to 1.1% by automatically controlling the distance d between the leading end discharge port and the core material 1 for current collection.

Next, regarding the variation of the coating weight in the width direction, the negative electrode plate of the comparative example was 3.0% while the negative electrode plate of the comparative example was 3.0%.
The negative electrode plate manufactured according to the second embodiment is 2.4%, which is lower than that of the comparative example.
By automatically controlling the distance d between the tip discharge port 4a and the core material 1 for current collection, the distance d becomes 1.0%, which is much lower than that of the first embodiment, and the negative electrode side manufactured according to the third embodiment. Electrode plate is pasty active material 1 by metering pump 13
2 in addition to the automatic control of the supply amount, the slit nozzle portion 14a
Is automatically reduced to 0.9% by automatically controlling the distance d between the tip discharge port and the current collecting core material 1. Thereby, the battery electrode plate manufactured by the manufacturing method of the present invention,
By controlling the application weight of the paste-like active material 12 with high accuracy,
It was confirmed that by automatically controlling the application of the paste-like active material 12 based on the measurement results, the variation in the applied weight in both the longitudinal direction and the width direction can be suppressed.

[0036]

As described above, according to the method for manufacturing a battery electrode plate of the present invention, the weight of the active material coated core material can be continuously measured based on the amount of transmitted radiation, and the weight measurement can be performed. ,
Since the measurement is performed using two or more types of radiation having different transmittances, the weight of only the active material layer can be calculated, and the influence of the weight variation in the longitudinal direction of the core material is eliminated to accurately calculate the weight of only the active material layer. Obtainable. In addition, since the rotation speed of the metering pump is feedback-controlled so that the error between the weight data of the active material layer and the reference data is within a set range, the application weight per unit area of the paste-like active material is transferred at a constant speed. It can be automatically adjusted so as to be constant especially in the longitudinal direction of the core material for current collection. Also, since the gap between the slit nozzle portion and the current collecting core material is feedback-controlled so that the error between the weight data of the active material layer and the reference data is within the set range, the paste-like active material discharged from the slit nozzle portion is controlled. The application weight per unit area of the substance can be automatically controlled so as to be constant, particularly in the width direction of the current collecting core material transferred at a constant speed.

Further, according to the apparatus for manufacturing a battery electrode plate of the present invention, a belt-shaped current collecting core transferring means, and a paste-like active material is discharged to form an active material layer on the surface of the current collecting core. An active material applicator for applying a coating, a moving body of the active material applicator, a metering pump for supplying a paste-like active material to the active material applicator, a drying furnace for drying the active material layer, Since it is provided with a weight measuring device for measuring the weight and a controller for feedback-controlling the rotation speed of the metering pump and the position of the moving body, respectively, the method for manufacturing the battery electrode plate according to the present invention is faithfully implemented. Thus, the effect of the manufacturing method can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a manufacturing apparatus embodying a method for manufacturing a battery electrode plate of the present invention.

FIG. 2 is a configuration diagram showing a weight measuring device in the manufacturing apparatus of the above.

FIG. 3 is a configuration diagram showing a main part of a manufacturing apparatus embodying the method for manufacturing a battery electrode plate according to the first embodiment of the present invention.

4A is a schematic plan view showing a main part of a manufacturing apparatus embodying a method for manufacturing a battery electrode plate according to a second embodiment of the present invention, and FIG. 4B is a schematic front view thereof.

FIG. 5 is a configuration diagram showing a main part of a manufacturing apparatus embodying a method for manufacturing a battery electrode plate according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current collection core material 3 Winding machine (core material transfer means) 12 Paste active material 13 Metering pump 14 Active material coating machine 14a Slit nozzle part 18 Active material coating core material 22 Weight measuring device 32 Beta ray (radiation) 33 X-ray (radiation) 38 Controller 42 Moving body d Distance between slit nozzle and current collector core

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B05D 7/00 B05D 7/00 A (72) Inventor Tomohide Rokutani 1006 Kazuma Kazuma, Kadoma City, Osaka Matsushita Electric F term in Sangyo Co., Ltd. (reference) 4D075 AC04 AC72 AC93 AC99 BB48Z CA47 DA04 DB01 DC18 EA14 4F041 AA05 AB01 BA05 BA12 BA35 4F042 AA06 BA02 BA05 BA08 BA22 CB02 5H050 AA19 BA15 GA22 GA29

Claims (6)

[Claims] 1. A paste-like active material supplied from a metering pump is applied to the surface of the current-collecting core by an active-material applicator while the belt-like current-collecting core is continuously transferred at a predetermined speed. Forming an active material layer, and irradiating the active material-coated core material after drying the active material layer with a plurality of types of radiation having different transmittances, and based on the amount of each radiation transmitted, the active material After measuring the weight of the layer,
Calculate an error between the weight data of the active material layer and reference data based on a predetermined weight of the active material layer, and feed back the rotation speed of the metering pump based on the weight data so that the error is within a set range. A method for manufacturing a battery electrode plate, characterized in that the supply amount of the paste-like active material to the active material coating machine is automatically adjusted by controlling. 2. A paste-like active material supplied from a metering pump is applied to the surface of the current-collecting core material while continuously transferring the belt-shaped current-collecting core material at a predetermined speed. An active material layer is formed by applying by discharging from a slit nozzle portion having an opening length equivalent to at least the width of the current collecting core material to form an active material layer, and drying the active material layer. After irradiating the core material with a plurality of types of radiation having different transmittances and measuring the weight of the active material layer based on the amount of transmission of each radiation,
An error between weight data of the active material layer and reference data based on a predetermined weight of the active material layer is calculated, and the slit nozzle unit and the collection unit are adjusted so that the error is within a set range based on the weight data. A method for producing an electrode plate for a battery, wherein a distance between the electrode plate and the electrode core is feedback-controlled. 3. A paste-like active material supplied from a metering pump is applied to the surface of the current-collecting core material while continuously transferring the belt-like current-collecting core material at a predetermined speed. An active material layer is formed by discharging from a slit nozzle having an opening length equal to at least the width of the current collecting core material, and the active material layer is dried and then transmitted to the active material coated core material. After irradiating a plurality of types of radiation of different degrees, after measuring the weight of the active material layer based on the amount of transmission of each radiation,
An error between the weight data of the active material layer and reference data based on a predetermined weight of the active material layer is calculated, and the rotation speed of the metering pump and the rotation speed are set so that the error is within a set range based on the weight data. A method of manufacturing an electrode plate for a battery, wherein the distance between the slit nozzle portion and the core material for current collection is feedback-controlled. 4. A transfer means for continuously transferring a belt-shaped current collector core at a predetermined speed, and a paste-like active material from a slit nozzle having an opening length at least equal to the width of the current collector core. And an active material coater for applying and forming an active material layer on the surface of the current collecting core material, wherein a distance between the slit nozzle portion and the current collecting core material changes. A moving body moving in the direction, a metering pump for supplying a paste-like active material to the active material applicator, and drying the active material layer in the active material coated core material after passing through the active material applicator. Oven, a weight measuring device for irradiating the active material coated core material having passed through the drying oven with two or more types of radiation having different transmittances and measuring the weight of the active material layer based on the amount of transmission of each radiation. And a weight data of the active material layer by the weight measuring device. After calculating the error by comparing the data with a predetermined reference data based on the weight of the active material layer, the rotational speed of the metering pump is adjusted so that the error is within a set range based on the weight data. And a controller for feedback-controlling the position of the moving body, respectively. 5. The battery electrode plate manufacturing apparatus according to claim 4, wherein the weight measuring device is configured to irradiate the active material coated core material with at least β-rays and X-rays. 6. The apparatus according to claim 5, wherein the β-ray source is krypton 85.