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Monitoring and balancing capacity in lithium-sulfur batteries arranged in series

A technology of lithium-sulfur batteries, arranged in series, applied in the direction of measuring electrical variables, arrangement of multiple synchronous batteries, measuring electricity, etc., can solve the problem of time-consuming equalization process, etc.

Active Publication Date: 2021-10-22
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The equalization process is also very time-consuming considering the charging time of each battery, which is measured in hours

Method used

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  • Monitoring and balancing capacity in lithium-sulfur batteries arranged in series
  • Monitoring and balancing capacity in lithium-sulfur batteries arranged in series
  • Monitoring and balancing capacity in lithium-sulfur batteries arranged in series

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Embodiment Construction

[0060] will now refer to figure 1 , which shows a schematic diagram of an apparatus 100 for monitoring relative capacity and state of charge between a plurality of lithium-sulfur batteries connected in series in a battery pack. In this case, the battery pack 120 comprises theoretically identical batteries 121A, 121B and 121C connected in series with at least initially equal rated capacities to supply energy to the load by converting the electrochemical energy stored in the batteries during a discharge cycle. (not shown) provides charge and stores charge during a constant current charge cycle. In alternative embodiments, more or less than three Li-S cells may be provided in a battery pack, and one or more cells may be provided as individual electrochemical cells or as more than one including parallel connections. The battery module of the battery.

[0061] The apparatus 100 for monitoring the relative capacity and state of charge among a plurality of lithium-sulfur batteries ...

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Abstract

An apparatus for monitoring relative capacity and state of charge between at least two cells or battery modules A and B in a plurality of lithium-sulfur cells arranged in series, comprising: a timer; a voltage monitoring module configured to for monitoring a voltage drop across each of the lithium-sulfur cells or battery modules arranged in series based on signals received from the voltage monitoring circuit; and a battery monitoring module coupled to the timer and the voltage monitoring module and configured During a charge cycle where the battery is charged at a constant current: recording the monitored voltage of the first battery leading the charge, battery A, reaches a first value set near the peak of the charge when the rate of change of the monitored voltage increases measurably. Voltage V 1 Timestamp T at (battery A) 1 (battery A); record the monitoring voltage of battery B following charging to reach the first voltage V 1 Timestamp T at (battery A) 1 (Battery B); recording leads the monitored voltage of Battery A to a second voltage V set to be substantially at the deemed highest point of charge 2 Timestamp T at (battery A) 2 (battery A); at T 2 (Battery A) Record the monitoring voltage V of the following battery B 2 (battery B); and at least based on T 1 (Battery A), T 1 (Battery B), V 2 (Battery A) and V 2 (battery B) to determine a metric indicative of the relative capacity difference between battery A and battery B.

Description

technical field [0001] The present disclosure relates to apparatus, methods and computer program products for monitoring and balancing capacity in lithium-sulfur batteries arranged in series. The present disclosure also relates to battery management systems or energy system controllers for monitoring and balancing charge and capacity in lithium-sulfur batteries arranged in series. Background technique [0002] Although lithium-ion secondary batteries are now mass-produced and in widespread use, lithium-sulfur (Li-S) is a next-generation battery chemistry with a theoretical energy density five times higher than well used as electrochemical energy storage. [0003] A typical lithium-sulfur battery includes an anode (negative electrode) formed of lithium metal or lithium metal alloy and a cathode (positive electrode) formed of elemental sulfur or other electroactive sulfur material. Sulfur or other electroactive sulfur-containing materials can be mixed with a conductive mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014H02J7/0048Y02E60/10G01R31/382H02J7/007184H01M10/441H02J7/0047H01M10/44
Inventor 克里斯·黑尔
Owner JOHNSON MATTHEY PLC