JPH0550105B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in a sealed lead-acid battery (hereinafter referred to as a "retainer battery") that uses a nonwoven fabric of inorganic or organic fibers as a separator and has a structure in which the separator retains an electrolyte. Conventionally, retainer batteries have been manufactured in a state where there is no free liquid by increasing the specific gravity of the electrolyte and reducing the amount of the electrolyte. This is because, if free liquid is present, dendrites will form and grow on the negative electrode plate in the portion where the electrode plate is immersed in the electrolyte, causing a short circuit with the positive electrode plate and reaching the end of its life prematurely. For this reason, in conventional retainer batteries, the positive electrode active material is likely to become muddy, and the battery performance is often impaired due to a decrease in the amount of electrolyte during use. Conventional retainer batteries require strict control of the amount of electrolyte injected in order to ensure a long life without free fluid, which requires a large amount of cost. The present invention aims to improve the service life and performance and reduce processing costs by improving the drawbacks of conventional retainer batteries. As shown in Table 1, an inorganic or organic fiber nonwoven fabric separator (hereinafter referred to as a "retainer") is made into a bag shape, and a positive electrode plate or a negative electrode plate is housed in the bag to assemble a storage battery, as shown in Figure 2. Inject the electrolyte until 1/10 to 1/2 of the electrode plate height is immersed,
The lower part is a liquid battery, and the upper part is a retainer battery. This allows free liquid to be retained without significantly deteriorating the sealing function. In this way, the bag-shaped retainer prevents short circuits due to the formation and growth of dendrites on the negative electrode plate, and by creating a structure that retains free liquid, the specific gravity of the electrolyte can be lowered and the amount of electrolyte can be increased. becomes possible. Furthermore, it suppresses the muddy formation of the positive electrode active material, suppresses the deterioration of battery performance due to a decrease in electrolyte, and improves the life performance of sealed lead-acid batteries. Since it is possible to have a free liquid of 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,00, Table 1 shows examples of the present invention. In Table 1, h and H have the same meanings as h and H in FIG. 2, respectively.

[Table] As is clear from Table 1 above, by setting the free liquid level height h to 1/10 to 1/2 of the extreme height H, the sealed reaction efficiency can be maintained at 90% or more. Cycle and trickle life performance can be improved. A in FIG. 1 is a retainer 1 in which two single-plate retainers are superimposed and integrated into a bag-like shape by bonding, welding, sewing, etc. at the shaded area, and B
Bend the retainer into a U shape and glue the shaded part,
This retainer 1' is formed into a bag shape by means such as welding or sewing. Furthermore, Fig. 2 shows a state in which the positive electrode plate 2 is housed in the retainer 1, a lead-acid battery is assembled, and the electrolytic solution 3 is injected to the liquid level height h, where h in this case is 1/10H≦ h≦1/2H. Note that 4 is a battery case, and 5 is a negative electrode plate. As mentioned above, the present invention improves the cycle life test by 20% and the trickle life test by 40%, and also has industrial value such as reducing the cost of injection equipment by 30% because the accuracy of the injection amount is relaxed. It's huge.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a retainer used in the present invention, where A shows a case in which two single-plate retainers are used, and B shows a case in which the retainer is bent into a U-shape. FIG. 2 is a sectional view of essential parts of the sealed lead acid battery of the present invention. 1 is a retainer, 2 is a positive electrode plate, 3 is an electrolyte, 5 is a negative electrode plate, 1...a battery case, 2...a negative electrode plate, 3...a bag-like retainer, 4...a positive electrode plate, 5...a free electrolyte .

Claims (1)

[Claims] 1 It has an electrode plate group in which a positive electrode plate or a negative electrode plate is housed in a bag-shaped separator made of a nonwoven fabric of inorganic or organic fibers, and the electrode plate group is impregnated with an electrolytic solution and the free liquid of the electrolytic solution is A sealed lead-acid battery that remains until 1/10 to 1/2 of the height of the electrode plate is immersed.