JPS5958755A - Lead storage battery - Google Patents

Abstract

PURPOSE:To achieve an excellent low-temperature electric discharge performance by maintaining close contact between the active material surfaces of the positive and the negative plates and electrolyte contained in the separator even at low temperatures by using a container containing a liquid presenting volume expansion at low temperatures. CONSTITUTION:A sealed lead storage battery is constituted by installing a plate group 4 impregnated with electrolyte in a container 3 formed by sealing a liquid 2 presenting volume expansion at low temperatures such as water in a double sided wall 1 made of a flexible acid-proof synthetic resin such as polypropylene. When the temperature of the battery is lowered, the liquid 2 such as water, sealed in the double sided wall 1, is solidified and the plate group 4 is pressed by the expansion of the thin section 5 of the double sided wall 1 caused by volume increase accompanying the solidification of the liquid 2. As a result, the positive plate 7 and the negative plates 6 of the plate group 4 become in close contact with the separator 8 of the plate group 4, and electrochemical reaction between electrolyte contained in the separator 8 and the active material surfaces of the positive and the negative plates 7 and 6 occurs vigorously even during electric discharge carried out at low temperatures, thereby the battery can indicate an excellent electric discharge performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is particularly concerned with improving the low temperature discharge performance of sealed lead acid batteries.

Conventionally, sealed lead-acid batteries, which are made by reacting and absorbing oxygen gas into a cathode active material, require a high rate of reaction between the cathode active material and oxygen gas in order to achieve the characteristics of no need for rehydration, no leakage, and can be used in any orientation. In order to increase the temperature, the porous separator and negative and positive active materials are impregnated with electrolyte and retained, and because the electrolyte is limited, when the battery is at a low temperature, the electrolyte that forms the electrode group is As the negative and positive electrode plates, separators, and electrolyte undergo volumetric contraction, the density between the cathode and anode active material surfaces and the separator decreases, causing the active material on the electrode surface and the electrolyte in the separator to shrink. The drawback is that the electrochemical reaction between the two is slow and the discharge performance at low temperatures is poor.

In addition to the advantages of a sealed lead-acid battery with a destemmed gas absorption structure, which requires no water refilling, no flooding, and can be used in any orientation, the present invention improves the two drawbacks and improves low-temperature discharge performance. (The purpose is to obtain a sealed lead-acid battery that can hold δ.

An embodiment of the present invention will be described.

A group of electrode plates 4 is placed in a container 3 made of a sealed liquid 2, such as water, which expands in volume at low temperatures.
The electrode plate group 4I is impregnated with electrolyte and retained.
This is a sealed lead-acid battery consisting of C, and when the battery reaches a low temperature, the double side of the battery case 3'I! lfk body 2 packed in 1
For example, water or the like solidifies, and due to the accompanying volumetric expansion, the thin portion 5 of the double side wall 1 swells and pressurizes the electrode plate group 4.

Therefore, the cathode plate 6 and the anode plate 7 of the electrode plate group 4 and the separator plate 8
Because of this, even in low-temperature discharge, an electrochemical reaction between the electrolytic solution in the separator plate 8 and the active material surfaces of the anode plate 6 and anode plate 7 occurs actively, resulting in a good discharge. It is possible to demonstrate performance.

As described above, according to the present invention, even when printing at low temperatures, it is possible to maintain close contact between the surface of the cathode and anode active materials and the electrolyte inside the partition film plate, thereby achieving a true low-temperature discharge. The practical value of being able to obtain high performance is enormous.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of the main parts of a sealed lead-acid battery having a cathode gas absorption structure, showing an embodiment of the wooden design. 1 is the side wall, 2 is the liquid, and 3 is the battery case patent applicant.

Claims (1)

[Claims] A lead-acid battery has a side wall containing a liquid that expands in volume when the temperature is low.