Battery Charging Time Estimation Using SOC-Temperature Current Maps
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Solution Overview
Problem
Conventional methods for estimating remaining charging time in batteries are inaccurate due to the use of a single charging range and fail to account for battery degradation, especially in multi-stage CC charging with varying current magnitudes.
Innovation Solution
A battery management system that utilizes a charging sequence table to determine the remaining charging time by correlating temperature ranges, state of charge (SOC) lists, and current lists, adjusting for battery degradation through capacity loss corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single charging range is used for estimating remaining charging time, then the calculation is simple, but the estimation accuracy is low especially when battery degradation occurs
Solution Approach 1:
The patent divides the charging process into multiple charging ranges (first charging range, second charging range, third charging range) based on different SOC intervals. Each charging range has its own capacity loss value stored in the memory, allowing for more accurate estimation of remaining charging time by selecting the appropriate range based on current SOC. This segmentation resolves the contradiction by increasing estimation accuracy through multi-range classification while maintaining manageable system complexity through structured data storage.
Solution Approach 2:
The patent changes the parameter of charging range classification from a single unified range to multiple discrete ranges with different capacity loss characteristics. By storing multiple capacity loss values corresponding to different charging ranges and selecting the appropriate value based on current SOC, the system adapts to battery degradation effects at different charge levels, thereby improving estimation accuracy without excessive complexity.
2Ease of manufacture
If conventional charging time estimation methods are used, then the method is simple to implement, but it does not reflect battery degradation changes resulting in low accuracy
Solution Approach 1:
The patent performs preliminary action by pre-storing multiple capacity loss values corresponding to different charging ranges in the memory before actual charging operations. This pre-prepared data structure allows the control unit to quickly select the appropriate capacity loss value based on current SOC during charging, without requiring complex real-time calculations. This approach maintains implementation simplicity while significantly improving reliability under degradation conditions.
Solution Approach 2:
The patent implements feedback by continuously monitoring the current SOC during charging and dynamically selecting the appropriate capacity loss value from multiple pre-stored values. The control unit adjusts the estimation calculation based on the selected charging range, providing adaptive compensation for battery degradation. This feedback mechanism improves reliability while keeping the implementation relatively simple through lookup-based selection rather than complex real-time modeling.
Data Source
AI summary
A battery management apparatus according to the present disclosure includes a memory to store a charging sequence table that records a correspondence relationship between first to mth temperature ranges, first to mth SOC lists and first to mth current lists, a sensing unit to detect a voltage, a current and a temperature of a battery, and a control unit. Each of the SOC lists defines first to nth SOC ranges. The control unit determines a current SOC of the battery based on the detected voltage and the detected current. The control unit determines a temperature range of interest, a SOC list of interest and a current list of interest based on the detected temperature. The control unit determines a remaining charging time required to charge the battery to a target SOC based on the detected current, the current SOC, the SOC list of interest and the current list of interest.