DRY CELL COMPRISING A SEPARATOR COMPOSED OF THREE LAYERS

• US 3,655,449 A
• Filed: 10/20/1969
• Issued: 04/11/1972
• Est. Priority Date: 10/28/1968
• Status: Expired due to Term

• Current Assignee: Akira Ota, Junichi Asaoka, Jun Watanabe, Masahiro Kuwazaki, Shohei Yamamoto, Susumu Hosoi, Toshikatsu Takata
• Original Assignee: Akira Ota, Junichi Asaoka, Jun Watanabe, Masahiro Kuwazaki, Shohei Yamamoto, Susumu Hosoi, Toshikatsu Takata
• Inventors: Yamamoto, Shohei, Watanabe, Jun, Ota, Akira, Hosoi, Susumu, Kuwazaki, Masahiro, Takata, Toshikatsu, Asaoka, Junichi
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US04/867,795
• Time in Patent Office: 904 Days
• Field of Search: 136/107,111,131-132,142-147
• US Class Current: 429/134
• CPC Class Codes: H01M 50/457 comprising three or more layers
• CPC Class Codes: H01M 6/08 with cup-shaped electrodes

Abstract

A dry cell having a separator layer interposed between a positive electrode and a negative zinc electrode, which separator layer is composed of three layers consisting of a paper having excellent water absorbing and water retaining properties, a barrier membrane formed of polyvinyl alcohol alone or polyvinyl alcohol incorporating a material which has at least one of water absorbing property, water retaining property, swelling property and adhesive property, and a paste layer.

Claims

2. A dry cell as defined in claim 1, wherein said barrier membrane is disposed adjacent said positive electrode depolarizer, said paste layer is disposed adjacent said negative zinc electrode, and said paper layer is interposed between said barrier membrane and said paste layer.

3. A dry cell as defined in claim 1, wherein said paper layer is disposed adjacent said positive electrode depolarizer, said paste layer is disposed adjacent said negative zinc electrode, and said barrier membrane is interposed between said paper layer and said paste layer.

4. A dry cell comprising a positive electrode depolarizer, a negative zinc electrode and a separator layer interposed between said positive electrode depolarizer and said negative zinc electrode, wherein said separator layer comprises three layers consisting essentially of a paper layer having water absorbing property and water retaining property, an ion-permeable barrier membrane consisting essentially of polyvinyl alcohol having a saponification degree of 75 to 95 and a polymerization degree of 1,200 to 1,600 and having incorporated therein at least one material having at least one of water absorbing, water retaining, swelling and adhesive properties, and a paste layer.

5. A dry cell as defined in claim 4, wherein said at least one material consists of at least one member selected from the group consisting of colloidal silica, polyacrylamide, starch, wheat flour, corn starch, methylethyl cellulose, carboxymethyl cellulose and hydroxypropyl cellulose.

6. A dry cell as defined in claim 4, wherein said barrier membrane is disposed adjacent said positive electrode depolarizer, said paste layer is disposed adjacent said negative zinc electrode, and said paper layer is interposed between said barrier membrane and said paste layer.

7. A dry cell as defined in claim 4, wherein said paper layer is disposed adjacent said positive electrode depolarizer, said paste layer is disposed adjacent said negative zinc electrode, and said barrier membrane is interposed between said paper layer and said paste layer.

8. A dry cell comprising a positive electrode depolarizer, a negative zinc electrode and a separator layer interposed between said positive electrode depolarizer and said negative zinc electrode, wherein said separator layer comprises three layers, consisting essentially of a paper layer having water absorbing and water retaining properties, an ion-permeable barrier membrane consisting essentially of polyvinyl alcohol having a saponification degree of 75 to 95 and a polymerization degree of 1,200 to 1,600, and a paste layer consisting essentially of electrolyte soluble polyvinyl alcohol.

9. A dry cell as defined in claim 8, wherein said paste layer consists essentially of electrolyte soluble polyvinyl alcohol and at least one material having at least one of water absorbing, water-retaining and swelling properties.

10. A dry cell as defined in claim 9, wherein said at least one material consists of at least one member selected from the group consisting of colloidal silica, polyacrylamide, starch, wheat flour, corn starch, methylethyl cellulose, carboxymethyl cellulose and hydroxypropyl cellulose.

11. A dry cell as defined in claim 1, wherein said barrier membrane is electrolyte insoluble at a first stage of discharge of said cell and is electrOlyte soluble at a second, later stage of discharge of said cell.

12. A dry cell as defined in claim 8, wherein said barrier membrane is electrolyte insoluble at a first stage of discharge of said cell and is electrolyte soluble at a second, later stage of discharge of said cell.