# US 4,391,036 A · Process for producing sealed lead-acid battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,391,036 A
- Document ID: US4391036A
- Status: Granted
- Kind: A
- Application number: 06/288,791
- Filed: 1981-07-31
- Granted: 1983-07-05
- Earliest claimed: 1981-07-31
- Assignees: Yuasa Battery Co., Ltd.
- Inventors: Kenjiro Kishimoto; Hideaki Igarashi; Migaki Kono
- Web page: https://patentgrep.com/patent/US4391036A

## CPC

- H01M 10/342: {Gastight lead accumulators (H01M10/121 takes precedence)}
- H01M 50/437: Glass
- H01M 50/44: Fibrous material
- H01M 2300/0005: Acid electrolytes
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/4911: including sealing
- Y10T 29/49115: including coating or impregnating
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A plate group is formed of positive and negative plates and separators formed mostly of glass fibers of a diameter not thicker than 1.0 micron and is inserted into a container. Then, a sulfuric acid electrolyte of a concentration of a viscosity increasing agent of 0 to 3.0% by weight is first poured in an amount smaller than the total pore volume of the plate group and a sulfuric acid electrolyte of a concentration of the viscosity increasing agent higher than in the above poured sulfuric acid electrolyte is then poured in so that the total poured amount may be the same as or larger than the total pore volume of the plate group. The sealed lead-acid battery obtained as mentioned above has an excellent discharge characteristic and gas recombining performance, is low in the internal resistance, is long in the service life and does not leak the electrolyte.

## Claims

### Claim 1

A process for producing a sealed lead-acid battery comprising the steps of
positioning a plate group in a container, the plate group being formed of positive and negative plates with separators therebetween, the separators being formed mostly of glass fibers having diameters of not more than 1.0 micron,
arranging a viscosity-increasing agent in the peripheral part of the plate group,
pouring a first sulfuric acid electrolyte into the container in an amount which is less than the total pore volume of the plate group,
pouring a second sulfuric acid electrolyte into the container in an amount such that the total amount of poured electrolyte is at least equal to the total pore volume of the plate group, and
sealing the container to form the sealed lead-acid battery.

### Claim 2 (depends on 1)

A process for producing a sealed lead-acid battery according to claim 1 wherein said viscosity-increasing agent is at least one member selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide and magnesium oxide.

### Claim 3 (depends on 2)

A process for producing a sealed lead-acid battery according to claim 2 wherein the specific surface area of said viscosity increasing agent is larger than 200 m.sup.2 /g.

### Claim 4 (depends on 1)

A process for producing a sealed lead-acid battery according to claim 1 wherein said separators include glass fibers having diameters greater than 1.0 micron.

### Claim 5 (depends on 4)

A process for producing a sealed lead-acid battery according to claim 4 wherein the glass fibers which have diameters greater than 1.0 micron include glass fibers which have diameters of 10 to 20 microns.

### Claim 6 (depends on 4)

A process for producing a sealed lead-acid battery according to claim 4 wherein the glass fibers in said separators are entangled together.

### Claim 7 (depends on 1)

A process for producing a sealed lead-acid battery according to claim 1 wherein the positive and negative plates in said plate group are generally rectangular in shape, the height of said positive and negative plates is larger than 60 mm and the ratio of their height to their width is not less than 1.0.

### Claim 8 (depends on 1)

A process for producing a sealed lead-acid battery according to claim 1 wherein the average concentration of said viscosity-increasing agent in the formed lead-acid battery is 0.01 to 4.0% by weight.