Sealed battery and manufacturing method therefor
The present invention's manufacturing method for a sealed battery includes: a process whereby a sealed battery application electrode assembly 11 is formed that has multiple positive electrode substrate exposed portions 14 at one end and multiple negative electrode substrate exposed portions 15 at the other end; a process whereby the negative electrode collector 18 1 and negative electrode collector receiving part 18 3 are brought against both surfaces of the part to be welded on at least the negative electrode substrate exposed portions 15 , with tape 23 a constituted of thermodeposited resin and having an opening 23 1 in the center being interposed; and a process whereby resistance welding is effected by passing current between the negative electrode collector 18 1 and negative electrode collector receiving part 18 3 positioned at the two sides.
1. A method for manufacturing a sealed battery, comprising:
forming an electrode assembly for the sealed battery having exposed portions of multiple positive electrode substrates at one end and having exposed portions of multiple negative electrode substrates at an other end;
bringing a collector and a collector-receiving part that are resistance-welded on both sides of the positive or the negative electrode substrates, or of both, with an insulating seal material being disposed around the resistance-welded portions, between the substrates on the one hand and the collector or collector-receiving part, or both, on the other; and
effecting resistance welding by passing current through the collector and collector-receiving part.
2. The method for manufacturing a sealed battery according to claim 1 , wherein the insulating seal material is tape made of thermodeposited resin, or adhesive insulating tape.
3. The method for manufacturing a sealed battery according to claim 1 , further comprising providing at least one of the collector and the collector-receiving part with a protuberance at the resistance-welded portion projecting toward the opposing collector or collector-receiving part, and bringing the protuberance into contact with a welding portion of the substrates in such a manner as to be positioned at the opening at the center of the insulating seal material.
4. The method for manufacturing a sealed battery according to claim 3 , wherein the thickness of the insulating seal material is 0.1 to 1.0 times the height of the protuberance.
5. The method for manufacturing a sealed battery according to claim 3 , wherein the width of the opening in the center of the insulating seal material is 1 to 5 times the width of the protuberance.
6. The method for manufacturing a sealed battery according to claim 3 , wherein one of the collector and the collector-receiving part is provided with the protuberance at the resistance-welded portion projecting toward the opposing collector or collector-receiving part, and the opposing collector or collector-receiving part is provided with a flat-surfaced salient at a portion opposing to the protuberance, the protuberance and the flat-surfaced salient are brought against the welding portion of the substrates in such a manner as to be positioned opposing each other at the openings at the centers of the insulating seal material.
7. The method for manufacturing a sealed battery according to claim 6 , wherein the flat-surfaced salient is of a circular shape viewed from above and has a diameter larger than that of the protuberance.
8. The method for manufacturing a sealed battery according to claim 6 , wherein the thickness of the insulating seal material is 0.1 to 1.0 times the height of the protuberance.
9. The method for manufacturing a sealed battery according to claim 6 , wherein the width of the opening in the center of the insulating seal material is 1 to 5 times the width of the protuberance.
10. The method for manufacturing a sealed battery according to claim 6 , wherein the insulating seal material is tape made of thermodeposited resin, and, designating as L the thickness of the tape made of thermodeposited resin and as H the height of the flat-surfaced salient, L and H are in the range such that L<H<(3/2)L.
11. The method for manufacturing a sealed battery according to claim 6 , wherein the insulating seal material is adhesive insulating tape, and, designating as t the total thickness of the adhesive insulating tape, as a the thickness of its adhesive, and as H the height of the flat-surfaced salient, t and a are in the range such that a<H <(3/2)t.
12. A method for manufacturing a sealed battery according to claim 1 , wherein the insulating seal material that has an opening in the center being interposed is disposed to form the welded portion inside the opening.
13. A method for manufacturing a sealed battery according to claim 12 , wherein the insulating seal material is disposed at both sides between the substrate and the collector and between the collector and the collector-receiving part.