JPS5946771A - Enclosed lead battery - Google Patents

Abstract

PURPOSE:To improve charge/discharge performance after overcharge and recovery capacity while to prevent overflow when forming the battery jar, by arranging acid-resistant porous material having liquid holding performance on the plate group. CONSTITUTION:Acid-resistant porous material 5 having liquid holding performance is arranged on a plate group 4 constructed with a positive pole plate 1, negative pole plate 2 and a separator 3 mainly composed of glass fiber. Said plate group 4 is inserted into a battery jar 8 then electrolyte or diluted sulfuric acid is injected throgh a liquid injection/discharge port 9 in the jar cover then an explosion-proof valve 10 made of rubber is fixed at the discharge port 9 to produce a small size enclosed lead battery. Consequently charge/discharge performance after over-discharge and recovery capacity are improved to prevent overflow when forming the battery jar.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that an electrode plate and a separator mainly composed of glass fibers are impregnated with an electrolytic solution, and oxygen gas generated from the positive electrode plate during sub-charging is transferred to the negative electrode plate. This relates to a sealed lead-acid battery that absorbs and removes water.

Conventional configurations and their problems The most important issue in downsizing sealed lead-acid batteries and improving their energy density is how to fit the battery components necessary for the desired battery capacity into a small space inside the battery container. It depends on how you incorporate it. Usually, as shown in FIG. 1, a positive electrode plate 1. The negative electrode plates 2 and glass fiber separators 3 are alternately stacked to form an electrode plate group 4, which is assembled into the battery container. The electrolyte is impregnated into the electrode plates and the separator. However, among the battery components, the electrode plate and the separator maintain a constant shape, but the electrolytic solution impregnated in the separator has an amorphous shape, so it varies in various positions.
For example, as shown in Japanese Utility Model Application Publication No. 63-113326, no effort has been made to maintain the necessary electrolyte in the space inside the battery container. .

It was considered that the required amount of electrolyte could be obtained by absorbing the electrolyte into a porous material. However, although this method satisfied the battery capacity, it had problems with charge acceptance after over-discharging and subsequent recovery capacity. It turned out to be bad in that respect. In addition, securing a larger amount of electrolyte than the required capacity does not suit the purpose of miniaturization, so one of the biggest drawbacks of small sealed lead-acid batteries is the charge acceptance after over-discharging. recovery capacity 3
B is bad. In addition, during so-called battery cell formation, in which electrolyte is injected into a sealed lead-acid battery that incorporates an electrode group consisting of unformed plates to a level higher than the height of the electrode group, so-called battery cell formation, small In a battery that has become oxidized, the amount of electrolyte and the distance between the electrolyte and the liquid stopper are too short, and the air bubbles that are generated during formation are broken by the blades of the liquid stopper, resulting in droplets that adhere to the stopper and block the exhaust hole, causing the battery to leak. A phenomenon was observed in which hot liquid leaked outside along with the gas generated inside. Leak caused by hot liquid like this.

Since it is difficult to chemically form the battery case due to terminal corrosion, etc., chemically formed electrode plates are generally used in small sealed lead-acid batteries.

Purpose of the Invention As mentioned above, the present invention improves charge acceptance and subsequent recovery capacity after overdischarging, which is a problem when downsizing sealed lead-acid batteries, and prevents hot liquid from forming during battery cell formation. The purpose is to 1. Daemonotea 21. .

Structure of the Invention Specifically, in order to achieve the above object, the present invention includes a positive electrode plate,
An electrode plate group consisting of a negative electrode plate and a separator mainly composed of glass fiber holds an electrolytic solution, and is characterized in that a side-1 acidic porous body having liquid retention properties is arranged on the electrode plate group. 8 By equipping an acid-resistant porous body with such liquid-retaining properties, electrolyte can be supplied to the porous body of the electrode plate/ff when charging after being left to discharge. Can improve acceptability and subsequent recovery capacity7
It captures electrolyte droplets caused by gas generation during the formation of a shattered battery, and also prevents hot liquid from leaking to the outside of the battery.

Description of examples Hereinafter, the details of the present invention will be explained in detail with reference to Examples.

As shown in FIG. 2, the positive electrode plate 1. On top of the electrode plate group 4 consisting of the negative oak plate 2 and the separator 3 whose main component is glass fiber,
Surface 1 Acidic porous material 5 that has liquid retaining properties when in contact with the grain
Place. In addition, in the figure, the current collecting side -7 connecting the same polarity plates is provided integrally with the current collecting side 6, and is a dipole pole.

The electrode plate group 4id constructed in this way is inserted into the battery case 8 as shown in FIG. .

A small sealed lead-acid battery is constructed by attaching an explosion-proof safety valve 10 made of rubber or the like to the exhaust port 9.

The acid-resistant porous body disposed on the electrode plate group is preferably made of a mat whose main component is glass fiber or synthetic resin fiber M1, and has excellent liquid retention ability.

In such batteries, the porous body is placed in contact with the electrode group, so after overdischarging, the electrolyte can be gradually supplied to the electrode plate through the contact surface between the porous body and the electrode group. 8 In the case of a small sealed lead-acid battery, if it is over-discharged, the sulfuric acid in the electrode plate will completely change to lead sulfate because there is not enough electrolyte, and the inside of the electrode plate will be in a neutral state. It has become. As a result, it is presumed that a non-conducting film is formed between the positive electrode lattice and the positive electrode active material.

When attempting to charge such a battery, it is extremely difficult to charge it and its recovery capacity is low. In the present invention, 10 is that after overdischarge, the sulfuric acid in the porous body, which was hardly used during overdischarge, gradually diffuses into the electrode plate, and 1) the gap between the positive electrode lattice and the positive electrode active material is also neutralized. Since the porous body impregnated with the electrolytic solution does not form a non-passive film, it is possible to improve charge acceptance after overdischarging and subsequent recovery capacity. is not in close contact with the electrode plate group, i
p, [This is because the electrolyte can be gradually supplied to the electrode plate after it is left alone, without consuming much sulfuric acid during overdischarge unless it is in contact with the electrode plate.

In addition, the porous body is a sealed lead-acid battery that incorporates unformed plates, and the electrolyte is added to a level higher than the height of the electrode plate group to perform chemical formation, which is called battery cell formation. Air bubbles are generated at the bottom of the liquid stopper and are splashed. Since it is possible to prevent the hot liquid from adhering to the liquid stopper, it is possible to prevent the hot liquid from leaking to the outside and prevent leakage and terminal corrosion caused by the hot liquid.

Now, the size of the electrode plate is 40 mm in length and 30 Inn in width, J
The height of the positive electrode plate is 3.0 mm and the negative electrode plate is Jlmm.The active material is filled in the lattice and 7 chemical compositions are used, and the separate composition is 2 positive electrode plates and 3 negative electrode plates,
70. Contact the separator with a porous material of 1.6 clIr made of the same material.

A sealed lead acid battery A was prepared by adding 17.5 ml of sulfuric acid with a specific gravity of 1.30 (2Q°C). A battery with the same electrode group configuration as a human being and with a cloak of 1, t5 C1l+' made of the same material as the separator placed at the bottom of the electrode group is designated as B-. The results of comparing the recovery charging characteristics and the subsequent capacity recovery rate are shown in FIGS. 4 and 5, respectively.

In addition, the discharge is 2 with a 15Ω resistor (o, equivalent to sG, 12V).
Discharge for 4 hours, and leave after discharging to remove the resistance and store at 25℃ for 30 days.
2,45V/cell) - maximum current 1. Ov 24 hours 25
Charged at ℃.

As is clear from the comparison between FIGS. 4 and 5, the recovery charging characteristics of the battery according to the present invention shown in FIG. It can be seen that the recovery charge weight is superior in a short time compared to comparative battery B shown in FIG. Capacity after recovery charging/Initial capacity x1oo
The capacity recovery rate calculated by (%) was 90 for 6 people and 74 for B, a plate nY consisting of an unformed plate with the above dimensions.
21 m (1
After pouring the liquid, 300 parts of the theoretically required amount of electricity was applied to form the battery. As a result, no warm liquid was found in the human battery, and warm liquid was found in all of the B batteries.
By adopting the battery structure of the present invention, even a small battery can be made into a battery case. Effects of the Invention According to the present invention, the following effects can be obtained. I can do it.

(1) It is possible to improve charge acceptance after over-discharging and subsequent recovery capacity, which have been regarded as shortcomings of small sealed lead-acid batteries.

(2) Small sealed lead-acid batteries have a short distance between the electrode plate group and the liquid frame, so it is difficult to form a battery case using hot liquid. In 11th year, Dame Tank Kasei, which can prevent hot liquid by placing a liquid-absorbing porous body on the electrode plate group, is 11.
Became capable.

These allow low-cost sealed lead-acid batteries...jf4
, :Te'i can.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a plate group in a conventional sealed lead acid battery, FIG. 2 is a diagram showing a plate group in an embodiment of the present invention, and FIG. 3 is a diagram showing a plate group in an embodiment of the present invention. A cross-sectional view of the life-closed lead-acid battery according to the invention A, FIG. 4 shows the recovery charging characteristics of the storage battery according to the embodiment of the present invention, and FIG. 5 shows the recovery charging characteristics of the conventional storage battery. be. 1... Positive electrode plate, 2... Negative electrode plate, 3...
...Separator whose main component is glass fiber, 4...
...Electrode plate (jL6...Acidic porous material with liquid retention properties, 8...Battery container.

Claims (1)

[Claims] A sealed lead-acid battery in which an electrolyte is held in an electrode plate group consisting of an Uesugi plate, a negative electrode plate, and a separator whose main components are glass fiber, and an acid-resistant porous material with liquid retention properties is arranged on the electrode plate group. .