Pulse battery having an electrode with at least two electroactive materials

• US 6,387,553 B1
• Filed: 11/30/1998
• Issued: 05/14/2002
• Est. Priority Date: 12/02/1997
• Status: Expired due to Fees

• Current Assignee: Electric Fuel Ltd.
• Original Assignee: Electric Fuel Ltd.
• Inventors: Putt, Ronald A., Goldstein, Jonathan, Givon, Menachem
• Primary Examiner(s): Kalafut, Stephen
• Assistant Examiner(s): WILLS, MONIQUE M
• Application Number:
  US09/201,524
• Time in Patent Office: 1,261 Days
• Field of Search: 320/21, 320/139, 429/122, 429/3, 429/9
• US Class Current: 429/3
• CPC Class Codes: H01M 10/30 Nickel accumulators H01M10/34 takes precedence
• CPC Class Codes: H01M 12/06 with one metallic and one gaseous electrode
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/36 Selection of substances as active materials, active masses, active liquids
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/48 of inorganic oxides or hydroxides
• CPC Class Codes: H01M 6/5033 used as charging means for another battery
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery power supply has a primary battery to provide long service life and a secondary battery to provide short instantaneous power pulses required by loads with variable duty cycles and puslatile load profiles such as digital cellular phones. The primary battery is linked to the power pulse battery in parallel and in series to the load. In the pulse battery, one of the electrodes has at least two electroactive materials as components of the same electrode. These different electroactive materials are selected to have different discharge potentials, charging potentials, and voltage outputs. One of the materials provides a voltage output of a predetermined level and the other of the materials lowers the overall charging voltage of the electrode below that of the first material. The mixed electrode in the pulse battery permits the pulse battery to be charged by the primary battery during the off-pulse periods throughout a substantial portion of the entire discharge voltage range of the primary battery. Thus, the primary battery is not required to provide very tight voltage ranges over its discharge cycle or history during operation with a pulsatile load. The primary battery may be a zinc-air battery.

Claims

1. A pulse battery comprising an electrode having at least two electroactive materials as components of the same electrode, wherein said electroactive materials have different discharge potentials, charging potentials and voltage outputs, a first of said materials providing a voltage output of a predetermined level and a second of said materials lowering the overall charging voltage of said electrode below that of said first material, and wherein said second material is present in an amount of at least 5 weight percent.

2. A pulse battery according to claim 1, comprising a negative electrode having at least two electroactive materials as components of the same electrode, said materials being selected from the group consisting of zinc, gallium, tin, cadmium, lead, indium, bismuth and metal hydrides.

3. A pulse battery according to claim 2, wherein said electrode is a mixed electrode having a pair of electroactive materials, said pair being selected from the group consisting of zinc/tin, zinc/lead, zinc/indium, tin/lead and metal hydride/lead.

4. A pulse battery according to claim 2, comprising a positive electrode having at least two electroactive materials as components of the same electrode, said materials being selected from the group consisting of nickel hydroxide, manganese dioxide and silver oxide.

5. A pulse battery according to claim 1, wherein said two electroactive materials are present in a ratio to each other of between 70:

30 and 30;

70 weight percent.

6. A pulse battery according to claim 1, wherein said two electroactive materials are present in a ratio to each other of between 40:

60 and 60;

40 weight percent.

7. A pulse battery according to claim 2, in parallel circuit with an energy battery, as herein defined.

8. A pulse battery according to claim 1, wherein said electrode is a mixed electrode comprising at least three electroactive materials.

9. A battery power supply, comprising:

a pulse battery with a mixed electrode having at least two electroactive materials as components of the same electrode, said electroactive materials having different discharge potentials;

an energy battery connected in parallel with said pulse battery;

a circuit formed by said interconnected pulse and energy batteries being connectable to a load such that when said load reaches a first level, said load is satisfied primarily by a power capacity of said energy battery and when said load reaches a second level, said load is satisfied substantially by a contribution by said pulse battery.

10. A power supply as in claim 9, wherein said pulse battery is configured such that it is charged by said energy battery at times when said load is at said first level.

11. A battery power supply, comprising:

a pulse battery with a mixed electrode having at least two electroactive materials as components of the same electrode, said electroactive materials having different charging potentials;

an energy battery connected in parallel with said pulse battery;

a circuit formed by said interconnected pulse and energy batteries being connectable to a load such that when said load reaches a first level, said load is satisfied primarily by a power capacity of said energy battery and when said load reaches a second level, said load is satisfied substantially by a contribution by said pulse battery.