Negative electrode for a nickel-hydrogen rechargeable battery and a nickel-hydrogen rechargeable battery using the same
A negative electrode for a nickel-hydrogen rechargeable battery is a strip-shaped negative electrode, the negative electrode being formed of a core body and a negative mixture layer covering the core body and containing hydrogen-storage alloy particles, including a main section, both sides of which face the positive electrode with the separator intervening therebetween as viewed in a rolled state where the negative electrode forms the electrode group with the positive electrode and the separator, and an outermost circumferential portion and an innermost circumferential portion that are protruding from ends of the main section in a rolling direction and facing the positive electrode with the separator intervening therebetween only with one side, wherein the hydrogen-storage alloy particles contained in the outermost circumferential portion and the innermost circumferential portion have an average diameter larger than an average diameter of the hydrogen-storage alloy particles contained in the main section.
1. A negative electrode for a nickel-hydrogen rechargeable battery, wherein the negative electrode is a strip-shaped negative electrode forming an electrode group with a positive electrode and a separator, which is to be contained in an outer can of a nickel-hydrogen rechargeable battery, wherein the negative electrode is formed of a core body and a negative mixture layer covering both sides of the core body and containing a large number of hydrogen-storage alloy particles, the negative electrode comprising:
a main section, both sides of which face the positive electrode with the separator intervening therebetween as viewed in a rolled state where the negative electrode forms the electrode group with the positive electrode and the separator, and
a protruding region that is protruding from an end of the main section in a rolling direction and facing the positive electrode with the separator intervening therebetween only with one side, wherein:
at least part of the hydrogen-storage alloy particles contained in the protruding region has an average diameter larger than an average diameter of the hydrogen-storage alloy particles contained in the main section,
wherein a filling density of the hydrogen-storage alloy is lower in the protruding region than a filling density of the hydrogen-storage alloy in the main section.
2. The negative electrode according to claim 1 , wherein:
the protruding region includes:
an outermost circumferential portion of the negative electrode, which is to contact a circumferential wall of the outer can as viewed in a rolled state.
3. The negative electrode according to claim 1 , wherein:
the protruding region includes:
an innermost circumferential portion of the negative electrode as viewed in the rolled state.
4. The negative electrode according to claim 1 , wherein:
the protruding region includes:
the outermost circumferential portion of the negative electrode, which is to contact the circumferential wall of the outer can, and the innermost circumferential portion of the negative electrode as viewed in the rolled state.
5. The negative electrode according to claim 1 , wherein:
the protruding region includes:
the outermost circumferential portion of the negative electrode, which is to contact the circumferential wall of the outer can as viewed in the rolled state.
6. The negative electrode according to claim 1 , wherein:
the protruding region includes:
the innermost circumferential portion of the negative electrode as viewed in the rolled state.
7. The negative electrode according to claim 1 , wherein:
the protruding region includes:
the outermost circumferential portion of the negative electrode, which is to contact the circumferential wall of the outer can, and the innermost circumferential portion of the negative electrode as viewed in the rolled state.
8. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 1 .
9. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 2 .
10. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 3 .
11. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 4 .
12. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 1 .
13. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 5 .
14. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 6 .
15. A nickel-hydrogen rechargeable battery comprising:
an outer can having a shape like a bottomed cylinder, and
an electrode group contained in the outer can and formed by rolling a negative electrode and a positive electrode into a scroll with a separator intervening therebetween, wherein:
the negative electrode is the negative electrode claimed in claim 7 .
16. The negative electrode of claim 1 , wherein a thickness ratio of the main section to the circumferential is 1:1 to 1:0.85.