Charging-Cycle Resistance Profiling for Battery Overhang Detection
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Solution Overview
Problem
The challenge is to diagnose a battery's state, particularly identifying overhang issues that can lead to lithium plating and internal short circuits, which affect battery lifespan and safety.
Innovation Solution
An apparatus and method that measure the battery's voltage at each cycle during charging, calculate resistance values, compare these values to a preset criterion profile to determine resistance change patterns, and diagnose the battery's state based on these patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If overhang occurs during battery manufacturing, then battery production efficiency is improved, but lithium plating occurs on the negative electrode surface causing battery degradation and safety issues
Solution Approach 1:
The patent applies preliminary action by measuring voltage at multiple predetermined cycles during the charging process to detect resistance changes before lithium plating causes severe damage. The system calculates resistance values at each cycle and compares them against criterion profiles to identify overhang-induced plating early in the charging process, enabling preventive diagnosis before the battery reaches a dangerous state.
2Difficulty of detecting and measuring
If traditional battery diagnosis methods are used, then device complexity is reduced, but the ability to detect lithium plating and overhang issues is insufficient
Solution Approach 1:
The patent replaces complex physical inspection methods with electrical measurement-based diagnosis. Instead of using sophisticated imaging or physical analysis to detect overhang and lithium plating, the system uses voltage measurements and resistance calculations to indirectly detect these conditions. This substitution of measurement methodology improves detection capability while avoiding the need for complex diagnostic equipment.
Solution Approach 2:
The patent introduces resistance value as an intermediary parameter to detect lithium plating and overhang conditions. Rather than directly observing physical overhang or plating, the system measures voltage changes and calculates resistance values that serve as indirect indicators of these conditions. The criterion profile acts as another intermediary, providing a reference framework for interpreting resistance changes and determining battery state.
3Measurement precision
If voltage is measured at each predetermined cycle during charging, then diagnosis accuracy is improved, but measurement time and process complexity increase
Solution Approach 1:
The patent applies partial action by measuring voltage at selectively predetermined cycles rather than continuously throughout charging. The system determines specific measurement cycles based on when resistance changes are most indicative of lithium plating conditions. This selective measurement approach provides sufficient diagnosis accuracy to detect overhang-induced plating while minimizing the total measurement time and number of measurements required.
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
This approach allows for the quick and accurate diagnosis of defective batteries with lithium precipitation due to overhang, enabling timely identification and addressing of potential safety issues.
Implementation Method 1
a measuring unit configured to measure a voltage value of the battery at each predetermined cycle during a battery charging process
Implementation Method 2
a processor configured to calculate a resistance value of the battery based on the measured voltage value of the battery
Data Source
AI summary
An apparatus for diagnosing a battery according to one aspect of the present disclosure may include a measuring unit configured to measure a voltage value of the battery at each predetermined cycle during a battery charging process; and a processor configured to calculate a resistance value of the battery based on the measured voltage value of the battery, determine a resistance change pattern by comparing the calculated plurality of resistance values with a preset criterion profile, and determine the state of the battery based on the determined resistance change pattern.