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| Magnetic recording medium |
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| Surface-coated cemented carbide article or part |
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| Magnetic recording medium and method for preparing the same |
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| Electrophotographic imaging process |
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| Solid state current limit circuit |
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Lead acid battery and method of storing it
| Details |
Inventors: Ishikura, Yoshikazu; Watanabe, Akira;
Assignee: Sanyo Electric Co., Ltd. (Osaka, JP)
Primary Examiner: Skapars; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Hubbell, Cohen, Stiefel & Gross
A lead acid battery comprising: a positive plate; a negative plate having higher capacity than said positive plate; a separator interposed between said plates; and an electrolyte, said plates and said separator being impregnated with said electrolyte, the amount of said electrolyte being limited so that a free electrolyte is not substantially present therein, the theoretical capacity of said positive plate being more than 2.5 times as much as the theoretical capacity of said electrolyte, and thus having an excellent discharge storage property; and a method of storing the retainer type lead acid batteries including above battery to improve the discharge storage property comprising permitting said battery to stand under such a condition that a load is connected between said positive and negative plates when said battery is allowed to stand after the discharge has been finished. |
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DETAILED DESCRIPTION The present invention is to provide a lead acid battery which includes a positive plate, a negative plate having higher capacity than the positive plate, a separator interposed between these plates, and an electrolyte, the plates and the separator being impregnated with the electrolyte, the amount of the electrolyte being limited so that the free electrolyte is not substantially present therein, the theoretical capacity of the positive plate being more than 2.
5 times as much as the theoretical capacity of the electrolyte, further to provide a lead acid battery wherein the theoretical capacity of the positive plate is more than 3 times as much as the battery capacity, and more further to provide a lead acid battery wherein hollow portions of a positive grid are filled with below 65 wt % of a positive active material against the total amount of the positive active material to be used when the positive plate is formed of the positive grid and the positive active material.
These lead acid batteries have excellent discharge storage characteristics, for example, the battery characteristic is not lowered even if it is allowed to stand for a long period of time after discharge.
Further, the present invention is to provide a storing method for permitting a battery to stand under the condition that a load is connected between negative and positive plates when allowed to stand for a long period of time after a retainer type lead acid battery, including a lead acid battery according to the invention, has finished the discharge.
According to the method of the invention, the discharge storage characteristic of the retainer type lead acid batteries can be further improved.
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