Secondary Battery Charge Pattern Control for Deterioration Limits
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Solution Overview
Problem
Existing secondary batteries face challenges in being charged safely and efficiently, with a need to suppress sharp deterioration and effectively utilize charging time based on user activity.
Innovation Solution
A management method for secondary batteries that sets a charge pattern based on internal state estimation, target data, and relation data to control charging within a threshold deterioration rate and target time, using a management device and system to optimize charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fast charging is performed to reduce charging time, then charging speed is improved, but battery deterioration rate increases
Solution Approach 1:
The patent applies dynamics by making the charge pattern adaptive and variable rather than fixed. The charge pattern is determined based on the current internal state of the battery (temperature, charge amount, etc.) and can be dynamically adjusted during charging. This allows the system to optimize charging speed while preventing deterioration by adjusting parameters in real-time based on battery conditions.
Solution Approach 2:
The patent changes physical parameters of the charging process based on battery state. Specifically, it adjusts charge current and temperature control parameters dynamically. When the battery is in a state that tolerates higher stress, faster charging parameters are used; when deterioration risk increases, parameters are adjusted to reduce stress, thus balancing charging speed and battery health.
2Reliability
If charge pattern is optimized to suppress deterioration, then battery reliability is improved, but charging time increases
Solution Approach 1:
The system dynamically determines charge patterns based on real-time battery state monitoring. Rather than using a conservative fixed pattern, the system adapts the charge pattern to current conditions, allowing faster charging when the battery can tolerate it while still protecting against deterioration when conditions require caution.
Solution Approach 2:
The patent implements feedback control by monitoring battery internal state (temperature, charge amount, voltage) and using this information to adjust the charge pattern. The management device receives state information, evaluates deterioration risk, and modifies charging parameters accordingly, creating a closed-loop system that balances speed and safety.
3Productivity
If internal state monitoring and dynamic charge pattern adjustment are implemented, then charging optimization is improved, but device complexity increases
Solution Approach 1:
The battery management system performs self-diagnosis and self-adjustment based on monitoring its own state. The management device autonomously determines appropriate charge patterns by evaluating battery temperature, charge amount, and other parameters without requiring external intervention or complex user input, simplifying the interface while maintaining sophisticated control.
Solution Approach 2:
The management device integrates multiple functions into a single system: it monitors battery state, calculates deterioration rates, determines charge patterns, and controls charging parameters. This multi-functional approach consolidates complexity into one coordinated system rather than requiring separate specialized components for each function.
Data Source
AI summary
In a management method of a secondary battery of one embodiment, a charge pattern in charge planned to be executed is set based on estimation data including an estimation result of an internal state of the secondary battery based on a measurement result of an electric current and a voltage of the secondary battery, target data including a target time for charging the secondary battery in the charge planned to be executed, and relation data indicative a relation of each of the internal state of the secondary battery and a charge condition of the secondary battery to a deterioration rate of the secondary battery. The charge pattern is set to be a charge pattern in which the deterioration rate does not exceed a threshold and the secondary battery is charged during the target time.