Battery Charge Control Method for Cycle-Based Voltage Adjustment
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Solution Overview
Problem
Lithium-ion battery cycle characteristics are not improved when charging with constant current/voltage, limiting the battery's lifespan in built-in configurations of electronic devices like notebook personal computers.
Innovation Solution
Implementing a charge control method that dynamically adjusts the charge voltage based on the cycle count, reducing the charge voltage in specific intervals to mimic the effect of lower charge voltage, thereby improving battery life by maintaining the battery's full-charge capacity and reducing heat generation during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant current/voltage charging is used, then charging simplicity is maintained, but battery cycle characteristic deteriorates
Solution Approach 1:
The patent implements dynamic charging control by adjusting charging parameters (current and voltage) based on the battery's cycle count. The charging circuit transitions from constant current/voltage charging to adaptive charging where parameters are dynamically modified according to accumulated cycle data, resolving the contradiction between charging simplicity and battery reliability.
Solution Approach 2:
The patent changes charging parameters (current and voltage levels) based on the battery's cycle characteristic degradation. By monitoring cycle count and adjusting charging parameters accordingly, the system maintains battery reliability while preserving charging simplicity through automated parameter adaptation.
2Reliability
If charge voltage is lowered to improve cycle characteristic, then battery life is extended, but charging efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts charge voltage based on the battery's cycle count rather than using a fixed low voltage. This allows the system to maintain higher charging efficiency when the battery is new while progressively lowering voltage as cycles increase, thus extending battery life without permanently sacrificing charging efficiency.
Solution Approach 2:
The patent implements periodic adjustment of charging parameters based on cycle milestones. By applying voltage reduction at specific cycle intervals rather than continuously, the system maintains optimal charging efficiency during early cycles while protecting battery life at later stages.
3Ease of manufacture
If built-in battery configuration is used, then device integration is improved, but battery replacement flexibility deteriorates
Solution Approach 1:
The patent enables the built-in battery to serve itself by monitoring its own cycle count and triggering charging parameter adjustments autonomously. This self-service capability compensates for the lack of user replacement flexibility by providing adaptive charging control that would otherwise require battery replacement to optimize performance.
Data Source
AI summary
On embodiment provides an electronic apparatus including: a controller configured to perform a power management of the electronic apparatus; a battery capable of counting cycles of a charging; and a charge circuit configured to perform the charging to the battery by using DC power supplied from an AC power supply device, wherein the controller is configured to cause the charge circuit to step down a charge voltage of the battery every predetermined number of the counts.