Battery Charge Control Using Learned Temperature Rise Rates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing charge control devices for secondary batteries struggle to accurately calculate charging parameters to prevent the battery temperature from exceeding the limit temperature, considering factors like time degradation and ambient temperature changes.
Innovation Solution
A charge control device that calculates a learning command value during an initial learning phase, determines a learning temperature rise rate, and uses this along with a charging-time temperature rise rate to set a charging command value, ensuring the battery temperature does not exceed the limit by controlling charging parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple charge control method is used, then the device complexity is reduced, but the manufacturing precision of temperature control deteriorates
Solution Approach 1:
The patent implements a learning phase before the actual charging phase to pre-acquire temperature rise characteristics of the battery. During this learning phase, the system measures how the battery temperature increases under different charging currents, storing this data for later use. This preliminary action enables the system to predict temperature rise during subsequent charging phases, allowing precise temperature control without complex real-time measurement and adjustment mechanisms during charging.
Solution Approach 2:
The patent calculates the charging-time temperature rise rate before the charging phase begins, using data from the learning phase. This pre-calculated temperature rise rate, combined with the limit temperature and charging duration, allows the system to determine the appropriate charging command value in advance. This approach achieves precise temperature control without requiring complex real-time monitoring and adjustment systems during the actual charging process.
2Ease of operation
If charge control is performed without considering time degradation and ambient temperature, then the ease of operation is improved, but the reliability of temperature control deteriorates
Solution Approach 1:
The patent enables the charge control device to automatically adapt to battery aging and ambient temperature changes through the learning phase. The system self-calibrates by measuring the actual temperature rise characteristics of the specific battery under current conditions, then uses this learned data to automatically adjust charging parameters. This self-service mechanism eliminates the need for manual intervention or complex external calibration processes, maintaining ease of operation while significantly improving temperature control reliability across different battery states and environmental conditions.
Data Source
AI summary
A charge control device calculates a learning command value of a charging parameter used in a learning phase, operates a charger in the learning phase to control the charging parameter to the learning command value, calculates a learning temperature rise rate, based on the temperature of the secondary battery, calculates a charging-time temperature rise rate in a charging phase that follows the learning phase, prior to the start of the charging phase, based on a limit temperature of the secondary battery and a duration of the charging phase, calculates a charging command value of a charging parameter which is used during a period from the start to the end of the charging phase, based on the learning command value, the learning temperature rise rate, and the charging-time temperature rise rate, and operates the charger in the charging phase to control the charging parameter to the charging command value.