Battery Control Device Dynamic Charge Rate Switching
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Solution Overview
Problem
Existing battery charging systems for portable terminals and mobile batteries are inefficient, requiring long charge times, especially when quick charging is needed, as they rely on equilibrated and normal charge modes that do not effectively utilize different charge rates to optimize charging time.
Innovation Solution
A battery control device and mobile battery system that employs a discharge controller to manage discharge to a lower limit SOC higher than a pre-charge SOC, and a charge controller to charge at a second rate when SOC is below the pre-charge SOC and switch to a first rate when SOC reaches or exceeds it, allowing for a quicker transition from pre-charge to quick charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the equilibrated charge mode and normal charge mode are used to charge the battery, then the battery can be fully charged while suppressing voltage difference among battery units, but the charge time becomes long
Solution Approach 1:
The patent applies dynamics by making the charge rate adjustable based on real-time SOC conditions. The charge controller dynamically switches between first charge rate (when SOC >= pre-charge SOC) and second charge rate (when SOC < pre-charge SOC), optimizing the charging process at different stages rather than using a fixed charge rate throughout
Solution Approach 2:
The patent changes the charge rate parameter based on SOC threshold conditions. By setting different charge rates (first charge rate and second charge rate) corresponding to different SOC ranges, the system adapts the charging parameters to the battery's current state, enabling faster charging while maintaining safety
2Reliability
If the pre-charge is executed at a low charge rate to equalize voltage among battery units, then voltage difference is reduced, but the time required for pre-charge becomes long
Solution Approach 1:
The charge rate is made dynamic rather than fixed. The system transitions from second charge rate to first charge rate when SOC reaches the pre-charge threshold, allowing the pre-charge phase to be completed quickly while still achieving voltage equalization among battery units
Solution Approach 2:
The system performs preliminary voltage equalization action during the pre-charge phase, but limits this phase to only until the pre-charge SOC threshold is reached. This preliminary action is sufficient to equalize voltages without requiring the entire charging process to proceed at the slower rate
Data Source
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AI summary
To shorten a charge time to a battery. A battery control device includes: a discharge controller which controls a discharge from the battery; and a charge controller which controls a charge to the battery. The discharge controller is configured to be capable of performing at least a discharge from the battery to a lower limit SOC determined in advance which is higher than a pre-charge SOC determined in advance. The charge controller is configured to charge the battery at a second charge rate that is lower than a first charge rate determined in advance when a present SOC of the battery is lower than the pre-charge SOC and to charge the battery at the first charge rate when the present SOC of the battery is equal to or higher than the pre-charge SOC.