Liquid lead storage battery

A cylindrical separator with oxygen-containing organic compounds in liquid lead-acid batteries captures antimony to prevent undercharging and stratification, improving high-temperature cycle life and discharge performance.

WO2026134135A1PCT designated stage Publication Date: 2026-06-25GS YUASA INT LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
GS YUASA INT LTD
Filing Date
2025-12-12
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

In liquid lead-acid batteries, the leaching of antimony (Sb) from the positive electrode current collector leads to a decrease in hydrogen overpotential of the negative electrode, causing undercharging, shortened high-temperature cycle life performance, and localized stratification due to non-uniform charging and discharging, especially in batteries with large vertical electrode plates.

Method used

Incorporating a cylindrical separator containing an oxygen-containing organic compound with specific LC/MS characteristics, such as polyoxyethylene-alkyl/alkenyl ethers, that captures Sb elements and controls electrolyte convection, preventing Sb deposition on the negative electrode and suppressing stratification.

Benefits of technology

The solution enhances high-temperature cycle life performance and maintains good high-rate discharge performance by stabilizing the separator and ensuring uniform charge-discharge reactions, even in batteries with elongated electrode plates.

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Abstract

In this liquid lead storage battery, positive electrode current collectors contain an Sb element and separators contain an oxygen-containing organic compound. An LC / MS spectrum of the oxygen-containing organic compound measured using chloroform as a solvent exhibits a plurality of peaks in a region where the m / z value is 400-2000. The plurality of peaks are present with an m / z spacing of 20-25 or 40-50. All oxygen atoms contained in the oxygen-containing organic compound are contained in at least one of an ether bond or a hydroxy group. The ratio of the total mass of the oxygen atoms contained in the oxygen-containing organic compound to the mass of the oxygen-containing organic compound is less than 0.320. Each separator is formed into a cylindrical body that encloses a negative electrode plate. A pair of end portions of the separator facing each other are joined to each other on one side surface of the negative electrode plate. At each of an upper end portion and a lower end portion of the cylindrical body, a portion corresponding to 30% to 70% of the length of the cylindrical body in the lateral direction is joined.
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