Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Utility Patent
1999-08-05
2001-01-02
Wong, Peter S. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S127000
Utility Patent
active
06169386
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for charging a lead-acid battery employing a non-antimony-lead alloy grid, and a charging apparatus using the method.
2. Description of the Related Art
The plate grid for a lead-acid battery has heretofore been mostly made of a lead-antimony alloy having an antimony content of not less than 1% by weight. Maintenance-free type lead-acid storage batteries which do not require maintenance such as replenishment with water normally comprise a non-antimony-lead alloy (alloys other than lead-antimony alloy having an antimony content of not less than 1% by weight will be hereinafter referred to as “non-antimony-lead alloy”) such as lead-calcium alloy to prevent the loss of water from the electrolyte.
A corrosion layer is formed on the positive plate grid in a lead-acid battery. When a battery using a non-antimony-lead alloy is repeatedly charged and discharged, the corrosion layer on the grid is discharged to form a barrier layer of lead sulfate at the interface of the positive plate grid with the active material, causing premature capacity loss.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for charging a lead-acid battery using a non-antimony-lead alloy grid, which is capable of suppressing the production of a barrier layer at the interface of the grid with the active material.
According to the present invention, a method for charging a lead-acid battery having a non-antimony-lead alloy grid, comprises the steps of: charging said battery; and after the charging step, incidentally discharging said battery in such a manner that the voltage of said battery which has been incidentally discharged per cell falls below the sum of 70 mV and equilibrium voltage that is an open circuit voltage of said battery in equilibrium state after being fully charged.
The present invention provides a charging apparatus using the above method.
REFERENCES:
patent: 4295097 (1981-10-01), Thompson et al.
patent: 5298350 (1994-03-01), Rao
patent: 5808445 (1998-09-01), Aylor et al.
Japan Storage Battery Co., Ltd.
Luk Lawrence
Sughrue Mion Zinn Macpeak & Seas, PLLC
Wong Peter S.
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