Negative electrode plate for nickel-metal hydride storage battery, method for producing the same and nickel-metal hydride storage battery using the same

• US 20060194106A1
• Filed: 04/28/2006
• Published: 08/31/2006
• Est. Priority Date: 04/16/2002
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Okawa, Takashi, Shibata, Soichi, Nakayama, Soryu
• Application Number:
  US11/414,709
• Publication Number:
  US 20060194106A1
• Time in Patent Office: Days
• US Class Current: 429/218.2
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/383 Hydrogen absorbing alloys
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/626 Metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A negative electrode plate includes a conductive support and a first, a second and a third layer laminated on a surface of the support in this order from the support side. The first layer contains a hydrogen storage alloy powder and a first powder essentially made of a carbonaceous material. The second layer-contains a hydrogen storage alloy powder, the first powder and a second powder having conductivity. The third layer contains the second powder as a main component.

Claims

1-8. -8. (canceled)

9. A negative electrode plate for a nickel-metal hydride storage battery, comprising a conductive support and an active material layer formed on both sides of the support, wherein

the active material layer contains a hydrogen-absorbing alloy powder as a main component,

a plurality of recesses is formed on a surface of the active material layer and

a conductive layer containing a conductive powder as a main component is provided so as to cover the surface of the active material layer and to fill in the recesses.

10. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein the conductive powder is a powder essentially made of a carbonaceous material.

11. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein the conductive powder is a mixed powder of a powder essentially made of a carbonaceous material and a metal powder.

12. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein the recesses are V-grooves.

13. The negative electrode plate for a nickel-metal hydride storage battery according to claim 12, wherein the grooves on one side and the grooves on the other side are arranged so as not to be directly opposite to each other.

14. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein the recesses are cone-shaped holes.

15. The negative electrode plate for a nickel-metal hydride storage battery according to claim 14, wherein the holes on one side and the holes on the other side are arranged so as not to be directly opposite to each other.

16. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein an amount of the conductive powder is 0.0001 g or more and 0.002 g or less per cm² of the negative electrode plate.

17. The negative electrode plate for a nickel-metal hydride storage battery according to claim 9, wherein particle sizes of the conductive powder are in the range of 0.05 μ

m to 7.0 μ

m.

19. A nickel-metal hydride storage battery comprising a negative electrode plate containing a hydrogen-absorbing alloy, wherein

the negative electrode plate is the negative electrode plate according to claim 9.

18. (canceled)

20-23. -23. (canceled)

24. A method for producing a negative electrode plate for a nickel-metal hydride storage battery, comprising:

(I) applying a first slurry containing a hydrogen-absorbing alloy powder and a first powder essentially made of a carbonaceous material to both sides of a conductive support, followed by drying to form an active material layer on both sides of the support;

(II) forming a plurality of recesses on a surface of the active material layer; and

(III) applying a second slurry containing a second powder having conductivity to the active material layer.

25. The method for producing a negative electrode plate for a nickel-metal hydride storage battery according to claim 24, wherein the second powder is a powder essentially made of a carbonaceous material.

26. The method for producing a negative electrode plate for a nickel-metal hydride storage battery according to claim 24, wherein the second powder is a mixed powder of a powder essentially made of a carbonaceous material and a metal powder.

27. The method for producing a negative electrode plate for a nickel-metal hydride storage battery according to claim 24, wherein particle sizes of particles constituting the first powder are in the range of 1 μ

m to 20 μ

m and particle sizes of particles constituting the second powder are in the range of 0.05 μ

m to 7.0 μ

m.

28. The method for producing a negative electrode plate for a nickel-metal hydride storage battery according to claim 24, wherein the recesses are V-grooves.