JPH09289032A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently recover the capacity by charging even after letting a battery stand in the discharged state by limiting the ratio of the weight of a cathode active material of a cathode plate to that of an anode active material of an anode plate to the specified value of less. SOLUTION: A cathode plate is manufactured by applying paste prepared by kneading PbO powder and sulfuric acid to a lead grid substrate, and oxidizing PbO to PbO2 by formation. Similarly, an anode plate is manufactured by reducing PbO to Pb. When PbO of the raw material of the cathode and the anode is converted into the active materials PbO2 and Pb obtained by formation, the ratio of the weight of the cathode active material (g) to the weight of the anode active material (g) is limited to 0.9 or less. A lead-acid battery using the cathode plate and the anode plate has a recovering rate of 90-100% after the battery is let to stand in the discharged state, but in the battery having a ratio of 0.95 or more, the recovering rate is impractically low of 40% or less.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a lead storage battery.

[0002]

2. Description of the Related Art Conventionally, a lead storage battery is provided with an electrode plate group in which an anode plate and a cathode plate are alternately laminated with a separator interposed therebetween, and a ratio of the amount of the anode active material of the anode plate to the amount of the cathode active material of the cathode plate is ratio. Is generally in the range of the following formula (1) from the relationship between the amount of the positive electrode active material 4.46 g and the amount of the negative electrode active material 3.87 g required for 1 Ah of electricity and reaction efficiency.

[0003]

[0004]

When a conventional lead-acid battery is used in an automobile, for example, a high current of the automobile consumes a small amount of electric current in a memory of a computer or the like even after a key is removed. It will be completely discharged. As a result, the anode active material (PbO ₂ ) and the cathode active material (Pb) are changed to coarse PbSO ₄ , respectively,
Recovery is difficult even after charging. Therefore, it is desired to be able to recover by discharging after the discharge.

[0005]

[PROBLEMS TO BE SOLVED BY THE INVENTION] The present invention provides a lead storage battery which eliminates the above-mentioned disadvantages of the conventional lead storage battery and can be recovered by charging even after discharging. The amount of positive electrode active material (g) / the amount of negative electrode active material (g) It is characterized in that it is provided with an anode plate and a cathode plate having a ratio of) of 0.90 or less.

By setting the above ratio to 0.90 or less, the recovery rate of 90 to 100% was restored when the lead storage battery was charged even after being left for a minute current discharge.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The anode plate and the cathode plate are generally manufactured as follows. That is, for the anode plate, PbO powder was kneaded with sulfuric acid to form a paste, which was then coated and filled on a lead grid substrate, for example, a grid substrate made of a Pb-Ca alloy, and PbO was oxidized to PbO ₂ by chemical conversion. Manufactured. The cathode plate is manufactured by kneading PbO powder with sulfuric acid to form a paste, coating and filling this on a lead grid substrate, then forming this to reduce PbO to Pb.

According to the present invention, the raw material P for this anode active material is
Converting bO and cathode active material PbO into the amounts of active materials PbO ₂ and Pb obtained by chemical conversion, respectively, the following formula (2)
The ratio of the amount of positive electrode active material (g) / the amount of negative electrode active material (g) in the positive electrode plate was 1.10; 1.00; 0.95;
90: 0.85; 0.80; 0.75; 0.70 to produce respective anode and cathode plates, and retainer mats for each pair of anode and cathode plates having their respective ratios. Were laminated via a separator made of (1) to be incorporated into a battery case, and a sulfuric acid electrolytic solution having a specific gravity of 1.300 was injected to prepare 8 types of lead storage batteries (6 cell monoblock type).

[0009]

The following tests were conducted on these lead-acid batteries to evaluate the recovery rate. That is, each of these lead storage batteries was fully charged and then discharged at 25 ° C. and 30 A (final voltage 6.0 V) to obtain the discharge capacity (1). Immediately thereafter, at a constant voltage of 15V, (Max3.0A)
After fully charged for 20 hours at 50 mA in a constant temperature bath at 40 ° C
After leaving the battery to discharge at a current of 30 days continuously, the battery is then fully charged in the same manner as above, and then 25 ° C, 30A.
Discharge (end voltage 6.0V) and discharge capacity (2)
Then, the recovery rate of the storage battery due to charging before and after being left in the discharged state was evaluated. The result is shown in FIG. The recovery rate was calculated by the following formula (3).

[0011]

As is apparent from FIG. 1, the lead-acid battery having a ratio of the amount of positive electrode active material (g) / the amount of negative electrode active material (g) determined by the above equation (2) of 0.90 or less has a recovery rate. 90% ~
In contrast to 100%, the recovery rate of the lead storage battery having the ratio of 0.95 or more was remarkably low at 40% or less, and practical recovery could not be obtained.

[0013]

As described above, according to the present invention, a lead-acid battery having an anode plate and a cathode plate in which the ratio of the amount of active anode material (g) / the amount of active cathode material (g) is 0.90 or less is constructed. By doing so, the recovery rate of 90 to 100% or more can be recovered by charging even after the discharge is left.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the ratio of the amount of anode active material / the amount of cathode active material and the recovery rate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akihiro Tsubuki, Akihiro Tsubuki 23-6, Hangashisaku, Joban Shimofunao-cho, Iwaki, Fukushima Prefecture Furukawa Battery Co., Ltd. Iwaki Plant (72) Naoto Sotozaki 2 Hoshikawa, Hodogaya-ku, Yokohama-shi, Kanagawa 4-1-1, Furukawa Battery Co., Ltd.

Claims (1)

[Claims] 1. An anode plate having a ratio [amount of positive electrode active material (g) and amount of negative electrode active material (g) [amount of positive electrode active material (g) / amount of negative electrode active material (g)] of 0.90 or less. A lead storage battery comprising: a cathode plate.