JPH09289035A - Sealed lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, simply enhance explosion preventing performance by occupying the specified ratio of the space volume of the side and upper part of an electrode group of a battery with a first filling layer comprising inorganic powder and a second filling layer comprising thermoplastic resin powder or a hollow material. SOLUTION: An electrode group comprising a positive plate 1, a negative plate 2, and a separator 3 is housed in a battery container 6, and the container 6 is sealed with a lid 7 having an electrolyte pouring port 10, then a dilute sulfuric acid electrolyte is poured. Inorganic powder such as silica powder is filled from the electrolyte pouring port 10 through a nozzle in a space 15 formed by the absorbing of the electrolyte in the electrode group by the initial charge to form a first filling layer 4. Powder of thermoplastic resin such as phenol resin or a hollow material is filled so that an electrode plate lug 16 or a strap 17 is buried, and the total filling volume occupies at least 25% of the volume of the inner space 15 of the battery to form a second filling layer 5. A rubber valve 9 is fixed to the electrolyte pouring port 10, and a cap 11 is fit to a pool part 12 to complete a sealed lead-acid battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead acid battery, and particularly to a sealed lead acid battery having excellent explosion-proof performance.

[0002]

2. Description of the Related Art Generally, a sealed lead-acid battery in which a dilute sulfuric acid electrolytic solution is injected for initial charging has a space inside the electrode group for storing the dilute sulfuric acid electrolytic solution being charged. It is provided on the upper side and the side of the electrode plate group. This internal space was filled with the electrolyte solution before the first charge, but after the first charge, the diluted sulfuric acid electrolyte solution that had been stored until then was absorbed and retained in the electrode plate group instead of the gas. It will exist as a space. If used normally, most of the oxygen gas in the sealed lead acid battery is absorbed by the negative electrode plate,
It hardly exists in the internal space of the storage battery.

Further, even when oxygen gas is generated from the positive electrode plate and hydrogen gas is generated from the negative electrode plate when the sealed lead acid battery is overcharged, the sealed lead acid battery is absorbed while the negative electrode plate can absorb the generated oxygen gas. Almost no oxygen gas exists in the internal space of the storage battery.

However, when the sealed lead-acid battery is excessively overcharged to generate oxygen gas from the positive electrode plate beyond the absorption capacity of the negative electrode plate, the internal space is filled with oxygen gas and hydrogen gas. Both will exist. And
If the concentration of this hydrogen gas is 4% or more and if it ignites due to some flash point, the oxygen gas will rapidly accelerate the combustion of the hydrogen gas, which may cause damage to the sealed lead-acid battery. Conceivable. This internal space has a larger volume than open-type (liquid-containing) lead-acid batteries of the same size, so if the sealed lead-acid battery were to be damaged due to the above factors, the energy at breakage would be significantly higher. turn into. In addition, examples of the fire point generated inside the sealed lead-acid battery include sparks and the like caused by cutting damage due to corrosion of the electrode plate ears and / or straps.

[0005]

From the above, if oxygen and hydrogen gas accumulated in the internal space of a sealed lead-acid battery damages the storage battery, the fragments are scattered and the relation between the equipment and the surroundings is increased. It can also affect the device.

[0006] Therefore, the present invention prevents the storage battery from being damaged even if it is subjected to an excessive overcharge that generates oxygen exceeding the oxygen gas absorption capacity of the negative electrode plate, and even if it is connected. An object of the present invention is to provide a sealed lead storage battery that effectively prevents damage to the storage battery even if cuts due to corrosion of parts occur.

[0007]

Therefore, in the sealed lead-acid battery according to the present invention, the space above the electrode plate group inside the battery and the space above the electrode plate group is filled with the inorganic powder. A packing layer is provided, and a second packing layer filled with granules and / or hollow bodies of a thermoplastic resin is provided on the upper part of the first packing layer, and at least 25% of the internal space volume of the storage battery is It is characterized by being occupied by both packing layers. Also,
It is characterized in that the electrode ears or the straps or both of them are embedded in the first or / and the second filling layer.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a sealed lead acid battery for injecting a dilute sulfuric acid electrolytic solution for initial charging, in which an upper electrode plate group and an electrode plate group side portion existing inside the storage battery after the initial charging are completed. Of the inorganic powder as the first filling layer, and the particles or / and hollow bodies of the thermoplastic resin as the second filling layer in the upper space of the space. It is characterized by being at least 25% of the space volume. In this way, since the filling layer is multi-layered and the inorganic powder is used for the first layer as the filling material, it is possible to easily fill even a narrow space on the side of the electrode plate group, so that the manufacturing process does not become complicated. I'm sorry.

Further, the use of granules and / or hollow bodies of a thermoplastic resin as the filling material of the second layer, and the volume of both filling layers being at least 25% of the internal space volume, is extremely excellent. It is possible to provide a sealed lead-acid battery that exhibits an explosion-proof function and is lighter than the case where all the first layer and the second layer are filled with inorganic powder.

Furthermore, by embedding the plate ears or straps, or both, in the first or second fill layer, or across both fill layers, corrosion breakage of these parts is caused. Even if sparks occur, the sealed lead-acid battery can be effectively prevented from being damaged by the effect of the narrow gap explosion protection.

[0011]

EXAMPLES The present invention will be described in detail below with reference to examples of a sealed lead acid battery of 12 A and 28 Ah / 5HR.

FIG. 1 is a schematic sectional view of a sealed lead-acid battery according to the present invention.

FIG. 2 is a schematic cross-sectional view of a sealed lead-acid battery in which an electrolytic solution has been injected before the initial charge.

FIG. 3 is a schematic sectional view of the sealed lead-acid battery of the present invention when the first filling layer is formed after initial charging.

FIG. 4 is a schematic sectional view of the sealed lead-acid battery of the present invention when the second filling layer is formed after initial charging.

In these figures, 1 is a positive electrode plate, 2 is a negative electrode plate, 3 is a separator, 4 is a first filling layer, 5 is a second filling layer, 6 is a battery case, 7 is a lid, 8 is a pole column, 9 is a rubber valve, 10 is a liquid injection port, 11 is a cap, 12 is a pull part, 13 is a dilute sulfuric acid electrolytic solution, 14 is a nozzle, 15 is a storage battery internal space, 16
Is a pole ear and 17 is a strap.

As shown in FIG. 2, when the dilute sulfuric acid electrolytic solution 13 is injected into the storage battery from the injection port 10 before the initial charge of the sealed lead acid battery, the upper part of the electrode plate group and the side parts of the electrode plate group are injected. Therefore, the dilute sulfuric acid electrolytic solution 13 is always present in. this is,
Due to the fact that the diluted sulfuric acid electrolytic solution 13 is poured in a large amount in consideration of the decrease in water due to water decomposition during the initial charging, and the speed at which it is absorbed and retained by the electrode plate group during the initial charging is slow, It is unavoidable.

However, when the initial charging is completed, the diluted sulfuric acid electrolyte solution 13 is almost absorbed and held inside the electrode plate group, so that the above-mentioned problems are present in the upper part of the electrode plate group and the side parts of the electrode plate group. The storage battery internal space 15 having the space becomes larger and continues to exist.

Next, as shown in FIG. 3, the nozzle 14 is inserted from the liquid injection port 10 of the sealed lead acid battery after the completion of the initial charge and filled with the inorganic powder to form the first filling layer 4. If the diameter of the inorganic powder is extremely small and is as close as possible to a sphere, it is possible to easily fill the narrow space on the side of the electrode plate group.

Further, after the first filling layer is formed, the nozzle 14 is again inserted into the liquid injection port 10 as shown in FIG. 4, and the particles of the thermoplastic resin are filled to form the second filling layer 4. At this time, if the filling is a hollow body, the mass of the sealed lead-acid battery of the present invention will be further reduced.

Thus, the first packing layer 4 and the second packing layer 5
Are separately filled and formed, and the total filled volume is at least 25% of the volume of the storage battery internal space 15 described above. At this time, the electrode tab 16 and / or the strap 17 or both of them are embedded only in the first or second filling layer or over both filling layers.

After that, as shown in FIG. 1, the rubber valve 9 is attached to the liquid injection port 10 and the cap 11 is fitted to the pool portion 12 to complete the sealed lead acid battery of the present invention.

The inorganic powder forming the first layer is silica, glass or the like, and the particles or / and hollow bodies of the thermoplastic resin forming the second layer are phenol, polypropylene, or the like. Polyvinyl chloride, polyethylene and polystyrene can be used. In addition, the shape of the inorganic powder is preferably as spherical as possible, and the particle diameter is preferably 100 to 200 μm.
Further, as the thermoplastic resin particles or / and hollow bodies,
A particle size of 1.0 to 2.0 mm is desirable.

Next, a damage test was conducted using the sealed lead acid battery of the present invention and a conventional sealed lead acid battery. The batteries according to the present invention were 25% filled, 15% filled, and 10% filled. Here, the inorganic powder and the thermoplastic resin granules and / or hollow bodies were filled in substantially the same amount. Table 1 shows the results. The damage test was conducted as follows.

First, after completely charging each sealed lead-acid battery, 2A, 4A, 6A, 8A, 10A, 15A,
The internal space was filled with hydrogen gas and oxygen gas at a ratio of 1: 2 by overcharging each current value of 20 A for 10 minutes.
Then, ignition was performed by the ignition electrode provided inside the storage battery.

[0026]

[Table 1] As is clear from the test results in Table 1, the volume of the storage battery internal space 15 in the upper part of the electrode plate group and the side part of the electrode plate group, in which oxygen gas and hydrogen gas are accumulated, is reduced by at least 25%, and the hermetic sealing according to the present invention is achieved. The lead-acid battery showed no damage compared to the conventional sealed lead-acid battery and did not affect the surroundings.

Further, since both electrode ears and straps are embedded in both filling layers, even if sparks due to corrosion cutting of these parts occur, the effect of narrow-space explosion-proof is obtained. Therefore, it is considered that the sealed lead-acid battery can be effectively prevented from being damaged.

Even in the case of a ready-to-use sealed lead-acid battery which is not charged, the space above the electrode plate group and the side of the electrode plate group should be set so as to easily inject the dilute sulfuric acid electrolyte at the time of use. Since it is necessary, the same explosion-proof performance can be improved by implementing the present invention.

[0029]

As described above, the sealed lead acid battery according to the present invention has the first filling layer filled with the inorganic powder in the space on the side of the electrode plate group and the space above the electrode plate group existing inside the battery. And a second packing layer filled with thermoplastic resin particles or / and hollow bodies on the upper part of the first packing layer, and at least 25% of the storage battery internal space volume is due to both packing layers. It is characterized by being occupied. Further, it is characterized in that the electrode ears or the straps or both of them are embedded in the first or / and the second filling layer.

As a result, the explosion-proof performance of the sealed lead-acid battery can be improved satisfactorily with an inexpensive material and a simple structure, and the weight is reduced as compared with the case where the second filling layer is also filled with inorganic powder. A sealed lead acid battery can be provided. Therefore, the industrial value of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a sealed lead-acid battery according to the present invention.

FIG. 2 is a schematic cross-sectional view of a sealed lead acid battery in which an electrolytic solution has been injected, before initial charging.

FIG. 3 is a schematic cross-sectional view of the sealed lead-acid battery according to the present invention when the first filling layer is formed after initial charging.

FIG. 4 is a schematic cross-sectional view of the sealed lead-acid battery according to the present invention when the second filling layer is formed after initial charging.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 First filling layer 5 Second filling layer 6 Battery case 7 Lid 8 Polar column 9 Rubber valve 11 Cap 10 Injection port 12 Pool part 13 Dilute sulfuric acid electrolyte solution 14 Nozzle 15 Storage battery inside Space 16 pole ears 17 strap

Claims (2)

[Claims] 1. A first packing layer filled with an inorganic powder is provided in a space on the side of the electrode plate group and an upper part of the electrode plate group existing inside the storage battery, and a heat is provided on the upper part of the first packing layer. A sealed lead having a second filling layer filled with granules and / or hollow bodies of a plastic resin, characterized in that at least 25% of the internal space volume of the storage battery is occupied by both filling layers. Storage battery. 2. The sealed lead-acid battery according to claim 1, wherein the first or / and the second filling layer has electrode ears or straps or both embedded therein.