JPH097606A - Sealed lead-acid battery - Google Patents

Abstract

PURPOSE: To extend a life of a lead-acid battery by setting a cross-sectional area of one of lattice bones in the different direction of a length of a positive electrode lattice to be a predetermined value and at the same time setting the ratio of cross-sectional area of one lattice bone to the other lattice bone to be a predetermined value to reduce dispersion of the cross-sectional area of the lattice bones. CONSTITUTION: A vertical cross-sectional area 1b of one of lattice bones in the direction of a length of a positive electrode lattice of a positive electrode plate is set the minimum area of above 2.5mm<2> such as 3mm<2> . The vertical cross-sectional area 1a of the other lattice bone is larger than the cross-sectional area 1b and a ratio of the areas 1a, 1b is set 1.0 to 1.5. Accordingly, dispersion if the cross-sectional area of the lattice bones is reduced and corrosion of the lattice bones due to charging and discharging operation is uniformized, thereby extending the life of a lead-acid battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved electrode plate grid for a sealed lead acid battery.

[0002]

2. Description of the Related Art Demand for sealed lead-acid batteries has expanded as an emergency power source for information and communication systems, and high reliability is required.

A conventional sealed lead-acid battery will be described below. FIG. 2 shows the structure of a positive electrode grid of a conventional sealed lead-acid battery. In FIG. 2, 2a is the maximum cross-sectional area when a bone located in the longitudinal direction of the positive electrode lattice bone is cut, 2a
Similarly, b shows the minimum cross-sectional area of the positive electrode grid. Conventionally, the ratio of 2a / 2b is 5 to 25, and the difference in thickness between the active material supporting bone and the frame bone is remarkable.

[0004]

In the above structure, first, the portion of the minimum cross-sectional area of the lattice bone is cut due to the corrosion of the lattice during the use of the battery, and the electricity for charging and discharging cannot be sufficiently supplied. Battery capacity begins to deteriorate. In addition, the part that does not corrode remains in the part with a relatively large cross-sectional area in the frame bone or lattice bone, and the electricity for charging and discharging concentrates in this part, and the corrosion is promoted from the initial stage. Accompanying this, the capacity deterioration was getting faster.

As described above, in the conventional sealed lead-acid battery, since there is a large variation in the cross section of the positive electrode grid in the longitudinal direction of the lattice bone in the vertical direction, the capacity of the battery is deteriorated quickly and the life is short. there were.

The present invention solves the above-mentioned conventional problems and provides a long-life sealed lead acid battery.

[0007]

According to the sealed lead-acid battery of the present invention, the minimum cross-sectional area of the lattice bones located in the longitudinal direction of the lattice in the vertical direction is 2.5 mm ² or more, and other longitudinal Using a lead alloy positive electrode grid in which the cross-sectional area of the vertical direction of the lattice bone in the direction is the same as or larger than the above and the ratio of the maximum value to the minimum value is 1.0 to 1.5 Is.

[0008]

[Action] sealed lead-acid battery of the present invention, the minimum value of the cut cross-sectional area in the vertical direction of the grating bone positioned in the longitudinal direction of the grating bone and 2.5 mm ² or more, and the other longitudinal direction of the grating bone Since the cross-sectional area in the vertical direction is the same as or larger than the above value and the ratio of the maximum value to the minimum value is set to 1.0 to 1.5, it is resistant to corrosion and has a high current collecting effect. Therefore 2.27
Charging voltage at 5V / cell, 0.2 at 25 ℃
It is possible to extend the period until the discharge duration in 5 CA discharge becomes 50% of the initial state.

FIG. 3 shows a 12 V 6.5 Ah type sealed lead-acid battery in which the ratio of the maximum value to the minimum value of the cross-sectional area in the vertical direction of the lattice bone located in the longitudinal direction of the lattice of the positive electrode plate is 1.0. , The minimum value of the cut cross-sectional area of the bone in the longitudinal direction of the lattice bone and the charging voltage at 2.275 V / cell, 25
The capacity of 0.25 CA discharge in the atmosphere of ℃ is 50
Shows the relationship with the period until it reaches%.

In the present invention, a lead alloy positive electrode grid is used in which the ratio of the maximum value and the minimum value of the vertical cross section of the bone located in the longitudinal direction of the positive electrode plate grid is 1.0 to 1.5. Since the difference between the degree of corrosion of the part with a large lattice bone cross-sectional area and the degree of corrosion of the part with a small lattice bone cross-sectional area is smaller than that of the conventional one, the current during charging / discharging will not concentrate on a part of the lattice. And the capacity deterioration due to the corrosion of the grid is suppressed.

FIG. 4 is a view perpendicular to the longitudinal direction of the lattice bone of the positive electrode plate.
Minimum cross-sectional area of 3.0 mm ²And then positive
Vertical cut of bone located in the longitudinal direction of the plate grid
The ratio of the maximum value and the minimum value of the area and the charge at 2.275V / cell
Voltage, 0.25 CA discharge in an atmosphere of 25 ℃
The relationship with the period until the amount reaches 50% of the initial amount is shown.
The ratio of the maximum value and the minimum value in the cut cross-sectional area of the lattice bone is 1.
From 0 to 1.5, it shows almost the same characteristics and exceeds 1.5
Then, the capacity decreases greatly.

[0012]

EXAMPLE An example of the present invention will be described below with reference to 12V6.5Ah.
The positive electrode grid of the type sealed lead-acid battery will be described with reference to the drawings.

As shown in the schematic view of FIG. 1, the positive electrode grid of the present invention has five long vertical grids (vertical bones) and five short horizontal grids (horizontal bones) and contains calcium and tin. It is made of lead alloy. The minimum value 1b of the cutting cross-section in the vertical direction of the longitudinal bones located in the longitudinal direction of this lattice bone is set to 3.0 mm ² , and the other vertical frame bones are made thicker to make the maximum and minimum values of the cutting cross-sectional area. A plate group was composed of a positive electrode plate having a thickness of 3 mm, a width of 40 mm and a height of 65 mm with a ratio of 1.2, and a negative electrode plate using a glass mat and an expanded lattice made of lead alloy containing calcium.

FIG. 5 shows a vertical cross-sectional area of a vertical bone located in the longitudinal direction of a positive electrode lattice made of a lead alloy containing calcium and tin, which has five conventional vertical bones and five horizontal bones. A positive electrode plate having a thickness of 3 mm, a width of 40 mm, and a height of 65 mm, in which the minimum value is 2.0 mm ² and the ratio of this minimum value to the maximum value of the cross-sectional area of other longitudinal bones is 5.5, and a glass mat. , A 12 V 6.5 Ah type sealed lead acid battery in which a plate group is composed of a negative electrode plate using an expanded lattice made of lead alloy containing calcium, and the sealed lead acid battery of the present invention described above at 60 ° C. The change in discharge capacity when continuously charged at a voltage of 0.275 V / cell and continuously discharged to a voltage of 1.75 V / cell at a current of 1.625 A every three weeks is shown for comparison.

From these results, the sealed lead acid battery of the present invention was
It can be seen that it has a longer life than the conventional one.

[0016]

As described above, in the sealed lead-acid battery of the present invention, the minimum value of the cross-sectional area in the vertical direction of the lattice bone located in the longitudinal direction of the positive electrode lattice is 2.5 mm ² or more, and The cross-sectional area of the bone located in the longitudinal direction is the same or large, and the ratio of the maximum value to the minimum value is 1.0 to 1.5.
Since the lead alloy positive electrode grid described above is used, the grid bone is unlikely to be cut due to corrosion, and the current collecting effect is high, so that a long life can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic view of a positive electrode grid of a sealed lead acid battery according to an embodiment of the present invention.

FIG. 2 is a schematic view of a positive electrode grid of a conventional sealed lead acid battery.

FIG. 3 is a minimum cross-sectional area and a charging voltage of 2.275 V / cell at 25 ° C. when the ratio of the maximum and minimum cross-sectional areas of the lattice bones located in the longitudinal direction of the grid is 1.0. Showing the relationship with the period until the capacity of 0.25 CA discharge reaches 50% of the initial value in the atmosphere of

FIG. 4 is a ratio of the maximum value and the minimum value of the cross-sectional area of the lattice bone and the charging of 2.275 V / cell when the minimum value of the cross-sectional area of the lattice bone located in the longitudinal direction of the lattice is 3.0 mm ^2. Voltage, 2
In an atmosphere of 5 ° C, the capacity of 0.25 CA discharge is 50
Diagram showing the relationship with the period until

FIG. 5 is a diagram showing the results of a trickle life test of a conventional sealed lead acid battery and a sealed lead acid battery of the present invention in an atmosphere of 60 ° C.

Claims (1)

[Claims] 1. The minimum value of the cutting cross-sectional area in the vertical direction of the lattice bones located in the longitudinal direction of the lattice is 2.5 mm ² or more, and the vertical cutting cross-sectional area of the lattice bones in other longitudinal directions is set. A sealed lead-acid battery using a lead alloy positive electrode grid in which the ratio of the maximum value to the minimum value is 1.0 to 1.5, which is the same as or larger than the above.