JPS6293858A - Manufacture of enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To prevent the occurrence of overflowing at times of injection of dilute sulfuric acid and chemical conversion treatment of a battery jar as well as to make the extent of initial capacity improvable, by assembling a porous separator in compression without doing ordinary aging and drying after filling up a grid with crude paste, while injecting the dilute sulfuric acid in the state that moisture in the paste is more than the specified quantity, and performing the chemical conversion treatment of the battery jar. CONSTITUTION:Lead carbonate or basic lead carbonate, etc., are formed in an uncovered plate during aging and drying, and carbonic acid gas is generated as reacting to dilute sulfuric acid, but if moisture of paste is made into a state of more than 5wt% without doing aging and drying, generation of this gas is lessened. And, if red lead or lead dioxide is mixed much in crude paste in advance, it is sufficiently and favorably convertible even if chemical conversion treatment of a battery jar takes place in the state that more than 5wt% of moisture is contained, and furthermore charging efficiency in a positive plate comes so better so that the quantity of electricity required for the chemical conversion treatment of the battery jar is reducible. If the charging efficiency is good enough, an electrolytic loss of water due to overcharging during chemical conversion becomes lessened, so that an injected electrolyte quantity is reducible, thus overflowing at injection and battery jar conversion processes is preventable.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing a sealed lead acid battery.

Conventional technology and its problems Sealed lead-acid batteries that utilize oxygen cycle reactions have recently been used in portable devices, etc., and the number of batteries has increased by 7M.

There are strong demands for this type of battery to be smaller and to improve energy density, and there is a tendency to reduce the space above the electrode group in the battery case. During the battery manufacturing process, gas is generated when diluted sulfuric acid is poured or during charging, but if there is little space above the electrode group, the electrolyte tends to overflow. In inter-book batteries, the space inside the battery case is limited.
f: Contains an I electrode plate and an electrolytic solution, and the temperature of the solution during the manufacturing process has a negative impact on discharge performance and life performance.

Means for Solving the Problems The present invention involves filling a grid with raw paste, then assembling the porous separator under pressure without carrying out conventional aging and drying, and diluting the paste in a state where the water content of the paste is 5% or more. Injecting sulfuric acid to form a battery cell, especially lead.

By filling the positive electrode grid with raw base I- containing 860 mol % or more of red lead or 20 mol % or more of lead dioxide as a lead compound raw material, the problems of the sealed lead acid battery described above are solved.

During aging and drying, lead carbonate and salt-based lead carbonate are generated in unformed electrode plates, which react with dilute sulfuric acid and generate carbon dioxide gas, but paste without aging and drying. When the water content is 5% by weight or more, this gas generation is small. Also, if a large amount of red lead or lead dioxide is mixed into the raw paste,
Even if battery cell formation is performed in a state where the water content is 5% or more, the chemical formation can be performed satisfactorily, and the charging efficiency of the positive electrode plate is improved, reducing the amount of electricity required for battery cell formation. . If the charging efficiency is good, the loss of electrolyzed water due to overcharging during formation will be reduced, so the amount of electrolyte to be injected can be reduced, and it is possible to prevent the liquid from heating up during the injection and battery cell formation processes.

EXAMPLE A sealed lead-acid battery without a flowing electrolyte was prototyped and tested using a lead-calcium-tin alloy as a grid and a porous plate made of glass fiber with an average diameter of 1 μm or less as a separator. Here, the lead powder raw material used for mixing raw paste,
In addition, the water content of the dilute 1iiiIII acid electrolyte and the paste used during battery cell formation were varied.

The results are not shown in Table 1. The amount of liquid injected and the amount of electricity applied at the time of forming the container were all the same.

Table 1: The temperature of the hot liquid depends on the water content of the paste during pouring and forming the container, and if it exceeds 5% by weight, there is almost no hot liquid. It can also be seen that the initial discharge capacity is degraded when the lead powder material contains 60 mol % or more of red lead or 20 mol % or more of lead dioxide.

Effects of the Invention The present invention prevents liquid leakage when pouring dilute sulfuric acid and forming the battery case in a sealed lead-acid battery by filling the battery case with a group of electrode plates to reduce the space above the battery case. This is what made the initial performance possible.

Claims (1)

[Claims] 1. After filling the grid with raw paste, press and assemble the porous separator without carrying out conventional aging and drying, and add dilute sulfuric acid while the water content of the paste is 5% by weight or more. A method for manufacturing sealed lead-acid batteries that eliminates the need for a fluid electrolyte by injecting liquid electrolyte and forming a battery. 2. The method for manufacturing a sealed lead-acid battery according to claim 1, characterized in that the raw paste contains 60 mol% or more of red lead. 3. The method for manufacturing a sealed lead-acid battery according to claim 1, wherein a raw paste containing 20 mol % or more of lead dioxide is used.