EP0734084A1
Expired / Lapsed
EP
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Lead acid storage battery and method for making same
Assignee: Panasonic Holdings Corp
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Filing: 1995-07-27
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Granted: —
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Expires: 2015-07-27
Abstract
Abstract A method for making a thin strap in a stable molten state in producing a plate group for a lead acid storage battery by integrally welding lugs of a plurality of plates (5,6) of the same polarity by cast-on-strap process. According to the method, the strap is formed in the following manner. A molten lead is fed in a strap forming tool (3) surrounded by an induction heating coil (2); control of the temperature of the molten lead and preheating of the tips of the plate lugs are carried out by the induction heating coil; the tips of the lugs is dipped in the molten lead and kept at a given temperature; and, thereafter, the mold is forcedly cooled (4) to solidify the molten lead.
Inventors
- 👤 Kensaku Tsuchida
- 👤 Takashi Hattori
- 👤 Rikio Miyagi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:16
CPC Classifications
B; B22; B22D; B22D25/00; B22D25/02; B22D25/04; B22D19/00; B22D19/04; H; H01; H01M; H01M50/00; H01M50/50; H01M50/531; H01M50/54; H01M50/541; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A lead acid storage battery having a construction in which lugs of a plurality of plates of the same polarity placed in a cell compartment of a container are connected to a plate-like strap molded from pure lead or a lead alloy, having a uniform and thin thickness and having no voids therein.
Claim 2
Dependent Claim
38 words
A lead acid storage battery according to claim 1, wherein the pure lead or lead alloy which forms the strap is solidified in such a state as molten with a part of the tips of the plate lugs.
Claim 3
Independent Claim
90 words
A method for producing a lead acid storage battery by integrally connecting lugs of a plurality of plates of the same polarity placed in a cell compartment of a container to a strap by cast-on-strap process wherein pure lead or a lead alloy in a molten state is contained in a strap forming mold heated by induction heating, the lugs of the plates are partially inserted in the pure lead or lead alloy to melt at least the tips of the lugs, and then the whole melt is forcedly cooled.
Claim 4
Dependent Claim
62 words
A method according to claim 3, wherein the induction heating is carried out by applying an electric current with a frequency of 20-150 kHz to a coil provided surrounding the strap forming mold, and control of the heating state is carried out by an electric source adjusted by a signal from a temperature detector with which the strap forming mold is equipped.
Claim 5
Dependent Claim
34 words
A method according to claim 3 or 4, wherein the forced cooling of the strap forming mold and the strap is carried out by a coolant spraying means provided under the strap forming mold.
Claim 6
Independent Claim
24 words
A method according to any of claims 3 to 5, wherein the formation of the strap is carried out in an inert gas atmosphere.
Claim 7
Independent Claim
21 words
A method according to any of claims 3 to 6, wherein the strap forming mold is made of a stainless steel.
Claim 8
Independent Claim
37 words
A method according to any of claims 3 to 7, wherein the tips of the plate lugs are preheated by induction heating and then inserted into the molten lead or lead alloy in the strap forming mold.
Claim 9
Independent Claim
162 words
A method for producing a lead acid storage battery by integrally connecting lugs of a plurality of plates of the same polarity placed in a cell compartment of a container to a strap by cast-on-strap process which comprises applying an electric current with a frequency of 20-150 kHz to a coil provided surrounding the strap forming mold made of a stainless steel to allow the strap forming mold to generate heat by the induction heating, feeding pure lead or a lead alloy in molten state in said strap forming mold, inserting a part of the lugs of the plates preheated by said induction heating in the pure lead or lead alloy, again heating the whole mold by the induction heating for a given period to melt at least the tips of the lugs together with the molten pure lead or lead alloy, and then, forcedly cooling the whole mold by spraying a coolant from a coolant spraying means provided under the mold.
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