An improved structure and method for liquid metal batteries

By incorporating a small-sized positive electrode current collector and a conductive coil into a liquid metal battery, the concentration polarization problem of liquid metal batteries is solved by utilizing the current convergence effect to generate a self-excited magnetic field that works in conjunction with the vertical magnetic field to drive axial jets and circumferential swirling flow, thereby improving the discharge voltage plateau and energy efficiency.

CN122091801APending Publication Date: 2026-05-26GUIZHOU POWER GRID CO LTD +1
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU POWER GRID CO LTD
Filing Date
2025-12-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Liquid metal batteries suffer from severe concentration polarization during discharge. Negative electrode metal ions are reduced at the positive electrode-electrolyte interface and form intermetallic compounds with the positive electrode, resulting in density stratification that inhibits positive electrode flow and reduces battery potential and capacity utilization.

Method used

A small positive electrode current collector is placed at the bottom of the battery casing and a conductive coil is wound around it. The radial convergence effect of the current generates a self-excited magnetic field, which works in conjunction with the external vertical magnetic field to drive the positive electrode liquid metal to form an axial jet and a circumferential swirling flow, thereby enhancing the mass transfer process.

Benefits of technology

It effectively suppresses concentration polarization, improves discharge voltage platform and energy efficiency, simplifies structure, reduces energy consumption, and eliminates the need for external mechanical stirring devices.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure FT_1
    Figure FT_1
  • Figure FT_2
    Figure FT_2
  • Figure FT_3
    Figure FT_3
Patent Text Reader

Abstract

This invention relates to the field of metal battery technology, and in particular to an improved structure for a liquid metal battery. The structure includes a battery casing and a positive electrode current collector disposed at the bottom of the casing. The positive electrode current collector is used to draw out the current flowing through the positive electrode. A conductive coil is wound around the positive electrode current collector. The conductive coil is used to generate a vertical magnetic field perpendicular to the battery stacking direction when energized. The beneficial effects of this invention are that by placing a conductive coil on the positive electrode current collector and utilizing the radial current convergence effect, a self-excited magnetic field is induced, which, in conjunction with an externally applied vertical magnetic field, drives the liquid metal at the positive electrode to form an axial jet and a circumferential swirling flow. This dual flow mode enhances the mass transfer process in the positive electrode region, effectively suppresses concentration polarization, and improves the discharge voltage plateau and energy efficiency.
Need to check novelty before this filing date? Find Prior Art