Battery Pulse-Response Diagnosis for Lithium Deposition Detection
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Solution Overview
Problem
Current battery diagnosis methods are time-consuming, labor-intensive, and costly, as they require disassembling batteries to visually check for lithium deposition, which accelerates degradation and can cause thermal runaway.
Innovation Solution
A battery diagnosis apparatus that applies a pulse current to the battery, detects the voltage response, and calculates an index comparing the on-ATRF and off-ATRF to determine the degree of lithium deposition, allowing for non-destructive diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is disassembled to visually check lithium deposition, then the deposition can be directly observed, but the diagnosis process becomes time-consuming, labor-intensive, and costly
Solution Approach 1:
The patent replaces the mechanical disassembly process with an electrical measurement system. By applying pulse current and measuring voltage responses, the system calculates ATRF values to detect lithium deposition without physical disassembly, thereby eliminating time loss while maintaining detection capability
Solution Approach 2:
The patent introduces electrical measurements (voltage and current) as an intermediary to indirectly detect lithium deposition. Instead of directly observing the deposited lithium, the system measures the electrical response characteristics that change due to deposition, enabling non-invasive detection
2Measurement precision
If the battery is disassembled to check lithium deposition, then the deposition can be detected, but labor and costs increase
Solution Approach 1:
The patent replaces labor-intensive manual disassembly and visual inspection with an automated electrical measurement system. The control device automatically applies pulse current, measures voltage responses, calculates ATRF values, and determines deposition levels, significantly reducing labor requirements and associated costs
Solution Approach 2:
The system enables the battery to effectively diagnose its own state by measuring its electrical response characteristics. The battery's inherent electrical properties are utilized to detect lithium deposition, eliminating the need for external physical intervention and reducing diagnostic costs
3Reliability
If pulse current is applied to measure resistance, then non-destructive diagnosis is enabled, but the measurement complexity increases due to ATRF calculation
Solution Approach 1:
The patent segments the measurement process into distinct phases: applying pulse current, measuring voltage response during current application, measuring voltage response after current cessation, and calculating ATRF values for each phase. This segmentation makes the complex measurement process more manageable and systematic
Solution Approach 2:
The patent employs dynamic measurements by applying time-varying pulse current and measuring the transient voltage response. The ATRF calculation captures the dynamic behavior of the battery during current transitions, providing reliable degradation information through temporal variations in electrical characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and accurate diagnosis of battery degradation by determining the degree of lithium deposition without disassembling the battery, reducing time, labor, and cost while improving safety by preventing thermal runaway.
Implementation Method 1
acquiring a voltage response obtained by applying the pulse current from the current source to the battery; deriving, based on the voltage response, an index indicating a comparison between an on-ATRF and an off-ATRF
Data Source
AI summary
A battery diagnosis apparatus includes a current source configured to apply a pulse current to a battery, a voltage sensor configured to detect a voltage between terminals of the battery, and a control device. The control device includes one or more processors and one or more memories coupled to the one or more processors. The one or more processors are configured to execute processing including acquiring a voltage response obtained by applying the pulse current from the current source to the battery; deriving, based on the voltage response, an index indicating a comparison between an on-ATRF and an off-ATRF, the on-ATRF being an apparent transient resistance function of the battery when the pulse current is turned on, the off-ATRF being an apparent transient resistance function of the battery when the pulse current is turned off; and determining a degree of deposition of lithium in the battery, based on the derived index.