JPH0511656Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention absorbs and retains liquid or gel dilute sulfuric acid electrolyte within the electrode plate group, or fills gelled dilute sulfuric acid electrolyte inside and outside the electrode plate group. This relates to a cathode absorption type lead-acid battery.

Conventional technology and its issues Sealed lead-acid batteries are completely sealed batteries that have the function of absorbing oxygen gas generated from the positive electrode during charging at the negative electrode, and have features such as no leakage of electrolyte. . The basic structure of this battery is that either the positive and negative electrode plates and the separator absorb and hold a liquid or gel dilute sulfuric acid electrolyte, or the gel semisolid dilute sulfuric acid electrolyte is filled inside and outside the electrode group. . Therefore, unlike normal liquid-type batteries, the electrolyte will not come out of the battery even if it is tipped over, so it may be used lying on its side. If the capacity of the battery is small, for example around 10 ampere-hours, the weight of the plate group is small, and therefore the moment applied to the strap is small, so no major problems have occurred in the past. However, in recent years, sealed lead-acid batteries have come to be used for stationary applications, mainly for communications. In this case, compared to the normal vertical arrangement, the horizontal arrangement eliminates the need for connection above the batteries and allows connection at the front, which improves the energy density of the group battery, and also allows for front connection. This feature makes wiring work easier during installation. However, lead-acid batteries used for stationary use often have a capacity of 100 amperes or more, and the plates are large, so when used horizontally with the plates oriented vertically,
The electrode plate group becomes floating in the air, and a large stress is concentrated on the strap portion, and the life of the storage battery is shortened due to stress corrosion of the strap. In addition, when the electrode plates are placed horizontally and used horizontally, the lower end of the electrode plate group is free, so the weight of the electrode plates pressurizes the separator and makes it thinner, reducing the amount of electrolyte between the plates and reducing the capacity. do. Furthermore, when the battery is placed horizontally, there is no vertical support for the electrode plate group, resulting in poor earthquake resistance, which poses a problem in that transportation of the battery horizontally is problematic.

Means for Solving the Problems The present invention provides a protrusion at the bottom of both or one of the positive and negative electrode plates, and inserts a comb-shaped plate whose width is approximately equal to the width of the inner wall of the bottom of the battery case into the protrusion from the side. To provide a sealed lead-acid battery with long life and excellent earthquake resistance by fitting and fixing to eliminate movement of the electrode plates in the group length direction and at the same time eliminating vibration of the electrode plates in the direction of the electrode plates. It is something.

Embodiment An embodiment of the sealed lead-acid battery according to the present invention will be described in detail below.

A 200 ampere sealed lead-acid battery with a height of approximately 300 mm was manufactured. Figure 1 shows the shape of the comb plate.

The comb pitch of this comb-shaped plate was designed to match the pitch of the electrode plates, and its width was made approximately equal to the width of the inner wall at the bottom of the battery case, so that the comb-shaped plate was fixed between the inner walls. The comb plate 2 is composed of a positive electrode plate foot insertion portion 21, a negative electrode plate foot insertion portion 22, and a comb convex portion 23. This comb plate was made of ABS resin, but
Any acid-resistant material such as resin or PP resin can be used.

FIG. 2 shows an example in which this comb-shaped plate is applied to a storage battery. The comb-shaped plate 2 shown in FIG. 1 is inserted into the positive electrode plate foot 3 and the negative electrode plate foot 4, and the lower end of the erect battery is fixed in both the group length direction and the electrode plate direction, and the upper end is connected to the positive electrode plate group strap 5 and the negative electrode plate. The plate groups were each fixed with straps 6. 1 is a battery case.

Sealed lead-acid batteries with such measures and products without measures are placed horizontally as shown in Figure 2 to reduce the ambient temperature.
The cells were charged at a constant voltage of 2.23V/cell at 45°C, and the capacity was measured every 6 months. The capacity trends of both are shown in the third section.
As shown in the figure. The life of the battery of this invention, in which the lower ends of the positive and negative electrode plates are fixed with comb-shaped plates, is approximately 2.7 years, which is approximately 1.7 years, compared to the life of a conventional battery without comb-shaped plates.
I was able to improve it by 60%. In conventional batteries, the positive electrode plate group strap was severely corroded by stress corrosion due to the weight of the electrode plate group, the electrical connection between the electrode plate group and the terminal portion deteriorated, and the life of the battery ended relatively early.

Furthermore, when vertical vibration was applied in the condition shown in Figure 2, the battery of the present invention had no problem even at 20Hz x 4G for 2 hours, but the strap of the conventional battery broke after about 1 hour at 20Hz x 1.5G.

Effects of the invention As stated above, the present invention has good life performance and earthquake resistance when used horizontally, and also improves the energy density of the battery pack by horizontally installing storage batteries, making installation work easier. It also has good properties, and its industrial value is great.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the shape of the comb plate used in the battery of the present invention, Figure 2 is a sectional view showing the legs of the positive and negative electrode plates in the sealed lead-acid battery of the present invention fixed by the comb plate, and Figure 3 is a diagram showing the shape of the comb plate used in the battery of the present invention. The figure is a diagram comparing the life test results of the battery of the present invention and the conventional battery. DESCRIPTION OF SYMBOLS 1... Battery case, 2... Comb-shaped plate, 21... Positive electrode plate foot insertion part, 22... Negative electrode plate foot insertion part, 23... Convex part, 3... Positive electrode plate foot, 4... Negative electrode plate foot , 5... Positive electrode plate group strap, 6... Negative electrode plate group strap.

Claims (1)

[Scope of utility model registration request] 1. Both or one of the positive electrode plate and the negative electrode plate has protruding feet, and the feet are arranged in the direction of the group length,
A sealed lead-acid battery characterized in that a comb-shaped plate whose width is approximately equal to the width of the inner wall of the bottom of the battery case is inserted and fitted from the side.