Battery Voltage Relaxation Detection for Lithium Plating

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Solution Overview

Problem

Existing methods for detecting lithium plating in batteries suffer from low accuracy and often require destructive disassembly or rely on indirect calculations, leading to inaccurate lithium plating representation amounts.

Innovation Solution

A method involving regular voltage collection after charging, construction of a time-differential voltage curve, and detection of a characteristic peak voltage in the curve to accurately determine lithium plating, allowing for precise adjustment of charging strategies and battery assessment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the battery is disassembled to observe plate status, then the lithium plating representation amount can be directly observed, but the battery is destroyed and pollution may be caused

Engineering Contradiction:

Improvelithium plating detection accuracyVSAvoidbattery destruction and pollution

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical disassembly method with an electrical measurement method. By measuring voltage changes during idle time after charging and constructing a time-differential voltage curve, the system detects lithium plating without physical disassembly, thus avoiding battery destruction and pollution while maintaining detection accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces voltage measurement as an intermediary parameter to indirectly detect lithium plating. Instead of directly observing plate status through disassembly, the system uses voltage changes during idle time as a mediator to infer lithium plating conditions, achieving non-destructive detection

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If indirect calculation according to battery aging data is used, then the detection process is non-destructive, but the acquired lithium plating representation amount has low accuracy

Engineering Contradiction:

Improvenon-destructive detectionVSAvoidlithium plating detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent changes the measurement parameter from general battery aging data to specific voltage changes during idle time after charging. By measuring voltage at multiple time points during the idle period and constructing a time-differential voltage curve, the system achieves more accurate lithium plating detection while maintaining non-destructive operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent performs preliminary voltage measurements during the idle time period immediately after charging before the battery is put into use. This preliminary action captures the voltage relaxation characteristics that indicate lithium plating, enabling accurate detection without affecting subsequent battery operation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12517181B2Battery lithium precipitation state detection method and system, vehicle, device, and storage medium

Publication Date: 2026.01.06 BYD CO LTD

AI summary

A method for detecting a lithium plating state of a battery includes regularly collecting a voltage of a battery after the end of charging at a preset time interval after the battery is in an idle state, and associatively storing the collected voltage and a collection time as voltage data; constructing a time-differential voltage curve in a voltage-time coordinate system according to the voltage data; detecting whether a characteristic peak voltage exists in the time-differential voltage curve; and sending a warning message when detecting that the characteristic peak voltage exists in the time-differential voltage curve.