Battery SOH Estimation Using SOC Region and Temperature Correction
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Solution Overview
Problem
Existing methods for estimating State of Health (SOH) of batteries, such as the ampere counting method, are inefficient and prone to inaccuracies due to temperature variations and sensor offset changes, leading to errors in estimating battery capacity.
Innovation Solution
A battery SOH estimating apparatus and method that corrects estimated SOH based on State of Charge (SOC) change amount, temperature, and C-rate, using a weight calculation that considers factors like SOC region, SOC change amount, and temperature to refine the estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ampere counting method is used to estimate battery SOH, then the estimation accuracy can be high when temperature and discharging rate are properly compensated, but the method requires full charge and full discharge which is inefficient
Solution Approach 1:
The patent applies partial action by estimating SOH using only a portion of the battery capacity range (partial charge/discharge cycles) rather than requiring complete full charge and full discharge cycles. The system calculates SOH based on capacity changes within specific SOC ranges, significantly reducing the time required while maintaining acceptable estimation accuracy.
2Device complexity
If the ampere counting method is used without proper compensation, then the method is simpler to implement, but errors accumulate due to current sensor offset changes and temperature variations
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring temperature and correcting for sensor offset changes during the estimation process. The system uses temperature compensation algorithms and periodically recalibrates the current sensor offset based on known reference points, feeding this corrected information back into the SOH calculation to maintain accuracy over time and across varying operating conditions.
Data Source
AI summary
The present disclosure relates to a battery SOH estimating apparatus and method capable of more accurately estimating a SOH (State of health) of a battery. Specifically, the present disclosure provides a battery SOH estimating apparatus and method that may more accurately estimate the SOH of a battery by correcting the estimated SOH of the battery based on a SOC (State of charge) change amount, a SOC change region, and a temperature of the battery.