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Method of producing a sheet electrode plate for electrochemical battery
| Details |
Inventors: Fukumura, Kenichi; Noda, Yoshiaki;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Nuzzolillo; M.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
In producing an electrochemical battery constituted by a positive electrode, a negative electrode and an electrolytic solution, an electrode material coating composition is discharged from an extrusion type liquid injector having a slot, and applied while at least one uncoated portion is being provided on a running conductive support in the running direction, so as to produce a sheet electrode plate. |
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DETAILED DESCRIPTION That is, in the case where an electrode mixture layer which has been once applied and dried is separated and removed in order to form an original surface portion of a conductive support for connecting a lead plate thereto, an extra process is required, so that production cannot be performed effectively.
In the case where an electrode material coating composition supported on a conductive support in advance was scraped to form an original surface portion on the support, an electrode mixture left in the original surface portion caused separation of a lead plate.
Even if the electrode mixture was not left on the uncoated portion, wrinkles or variations of thickness of an electrode mixture layer were produced when production was performed for a long time.
It is therefore an object of the present invention to provide a method in which a superior coated surface is obtained on a conductive support while, at the same time, an approximately straight uncoated portion having no residual electrode mixture is provided on the conductive support in the running direction thereof.
The foregoing problems are attained by a method of producing a sheet electrode plate in the production of an electrochemical battery constituted by a positive electrode, a negative electrode and an electrolyte, characterized in that an electrode material coating composition is discharged from an extrusion type liquid injector having a slot so that coating is performed on a running conductive support while providing at least one uncoated portion on the support in the running direction thereof.
In the above-mentioned method, preferably, the pressure of a liquid reservoir portion of the extrusion type liquid injector is not less than 0.
2 kg/cm.
sup.
2 and not more than 10 kg/cm.
sup.
2.
An extrusion type liquid injector 21 used in the present invention has a slot 18 formed between two lips 16 and 17 which face each other with a gap therebetween as shown in FIG.
2, and a liquid reservoir 20 located inside the liquid injector 21 so as to communicate with the slot 18
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Nonmetallic Processes 
