JPS5859565A - Closed-type lead storage battery - Google Patents

Abstract

PURPOSE:To markedly improve the gas absorption performance of a negative electrode plate, prevent softening of active substance and reduce the self-discharge by arranging between the negative and the positive electrode plates. The glass mat which consists of the glass fiber of a specific diameter serving as main constituent without any binder. CONSTITUTION:An electrode group consists of three pieces of 2mm. thick positive electrode plates and two pieces of 3mm. thick negative electrode plates and prepared by alternately laminating the positive and the negative electrode plates, having the glass mat interposed which is prepared by mixing the glass fiber of diameter 0.5-1mu in 90% and the glass fiber of diameter 10mu in 10% without using binder. Said electrode group is accomodated in a battery enclosure in the state compressed under 10kg/dm-80kg/dm, pressure and thus a closed-type lead battery is prepared. Lead-calcium alloy is used for lattice body. The most preferable clamping pressure is 20-70kg/dm<2> or so.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sealed lead-acid battery. This is in favor of a battery that has a so-called reverse assembly configuration in which the anode plate is used as a side plate, and by eliminating the drawbacks associated with this configuration, a battery with high capacity efficiency and long life can be obtained. The purpose is to

Conventionally, the amount of electrolyte in sealed lead-acid batteries is severely limited to prevent leakage. Therefore, the discharge container is regulated by the amount of electrolyte. Therefore, as measures to increase capacity efficiency, methods such as using high-pressure heavy electrolysis and electrolysis, and increasing the porosity of the active material and increasing the liquid content have been adopted.

However, the former has the drawback of increasing the self-discharge of the battery and the softening of the positive electrode active material, while the latter has the drawback of shortening the battery life.

Therefore, in order to maintain the concentration of the electrolyte in the parts directly involved in the 9 reactions relatively high without increasing the concentration of the electrolyte, the decrease in the concentration of the electrolyte due to water generated on the anode plate as a discharge product is minimized. Therefore, it is possible to adopt a so-called reverse assembly configuration in which the number of anode plates is increased by one than the number of anode plates by making the anode plate a side plate of the electrode group. As the number of plates increases relative to the number of cathode plates, the current density of the anode plate decreases accordingly, increasing the utilization rate of the electrolyte.

However, in this case, if the structure is simply reversely assembled, the following drawbacks will occur. In other words, in this cypress sealed battery, the gas generated during charging needs to be absorbed by the cathode plates, but as the number of cathode plates is reduced due to reverse assembly, the amount of gas absorbed by the cathode plates is reduced. Furthermore, since there is a balance between the utilization rate of the active material and the inside of the monopolar plate serving as the side plate, the active material softens and falls off more quickly, reducing the battery life.

The present invention is designed to seal the fibers in a 4i battery without causing the drawbacks listed below, and the fiber diameter is 1μ.
It is characterized in that it is mainly made of glass fiber as described below and is provided with a crow mat without a binder. In other words, this structure significantly improves the gas absorption of the cathode plate, and since the glass mat does not contain a binder, its repulsive force is greater than that of a material with a binder.
Therefore, softening of the active material is prevented and self-discharge is significantly reduced.

Next, the examples and the comparison results of a performance test between them and a sealed lead 4 battery not according to the present invention will be presented.

Consists of 5 monopolar plates with a thickness of 2■ and 2 negative plates with a thickness of 6■.
The electrode plate and the negative plate are made by interposing a glass mat made by mixing 90% of glass fibers with a total fiber diameter of 0.5 to 1me4 and 10% of glass fibers with a fiber diameter of 10μ without using any binder. Lay them alternately to form a wire group, which is 50 Ky/
A sealed lead-acid battery A according to the present invention was manufactured by storing the battery in a battery case under a pressure of M. Note that a lead-calcium alloy was used for the grid. In addition, the other matters are the same as those of the sealed lead-acid battery A', i), and the sealed lead-acid battery B according to the present invention has a tension force of 10 Kg/M and 8Q Kg/, m.
and glass pine, sealed lead using 5% styrene binder, tji4ike D1 fiber diameter approx. 21]
A sealed lead-acid battery E1 using μ glass fiber T Karasmy) was fabricated in a sealed lead-acid battery 41 dt battery using T1 Idgel electrolyte. These sealed lead a4
Change in discharge time in a cycle life test at an unlimited charge rate of /li1 for 10 hours, rate of decrease in 4-solution when overcharged at 20 times the capacity, group +1 for 6 months at 50°C
Testing (4 hours of self-release, and 20 hours of charging/discharging Q)
The changes in the inter-terminal voltage at M4 at the 20th cycle in the cycle life test are shown in figures $1 to -$4, respectively.

These results show that the closed type assembled ttJt pond according to the present invention has extremely excellent performance. Furthermore, the tensile force applied to the glass mat is greater than 10 Kg/M 8
L) less than Kg/lhi21]~7 tl i
, q, /M('')! It can be seen that the best results are obtained when one horsefly is used.

The present invention is capable of fully bringing out the performance of a reverse-assembled closed type No. 4 pond, and is of great industrial value.

[Brief explanation of the drawing]

Figures 1, 2, L$5, and 4 show two cases of a sealed lead-acid battery according to the present invention and a sealed lead-acid battery not according to the present invention, respectively.
Changes in unlimited time in a cycle life test with an unlimited charge rate of 0 hours, reduction rate of city solution when conducting a test with a capacity of 20 times the capacity, 6 months of charging at a rate of 0, It is a graph showing the deterioration of the voltage between the terminals in the discharge of 2 (]] cycles in the cycle thin cloth test at the self-discharge rate of 41, L; upper and 20:111 in the test. Applicant: Asa Ko゛Heavy oil FI: Formula 1 Figure 2

Claims (1)

[Claims] In a closed lead-acid pond that has a reverse assembly configuration and has limited liquid filtration such that all electrolyte is almost completely impregnated at or around the plates, the anode plate and cathode A sealed lead-acid battery characterized in that a glass mat mainly made of glass fibers with a fiber diameter of 1 μm or less and without a binder is arranged between the plate and the plate.