Battery Control IC Power Supply Capability Update
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Solution Overview
Problem
Battery packs experience system shutdowns due to increased internal resistance after long-term storage, leading to unexpected voltage drops when a heavily loaded process is executed without updating the power supply capability values.
Innovation Solution
A semiconductor device in the battery pack updates the power supply capability value stored in ROM to a smaller value before requesting it from the system, considering the deterioration state, to prevent system shutdowns during startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply capability value is not updated after long-term storage, then the system can operate with higher power supply capability, but the internal resistance increase causes voltage drop and system shutdown
Solution Approach 1:
The battery control IC updates the power supply capability value in advance after detecting a predetermined period has elapsed since the last update, before the system actually requests the value. This preliminary update prevents the voltage drop and system shutdown that would occur if the outdated higher capability value were used.
2Reliability
If the power supply capability value is updated frequently, then the system stability is improved, but the power consumption and processing load increase
Solution Approach 1:
The battery control IC updates the power supply capability value periodically based on elapsed time, specifically when a predetermined period has passed since the last update. This periodic update mechanism maintains system stability while avoiding excessive updates that would waste power.
Solution Approach 2:
The update is performed in advance before the system requests the power supply capability value, ensuring the value is current without requiring continuous monitoring or frequent updates driven by system demands.
3Loss of information
If the power supply capability value is updated after system request, then the system can use the latest value, but the update process delays system startup
Solution Approach 1:
The battery control IC proactively updates the power supply capability value before the system requests it, by detecting when a predetermined period has elapsed. This eliminates the delay that would occur if the update had to wait for a system request, while avoiding unnecessary updates that would waste time when the period hasn't elapsed.
Data Source
AI summary
To suppress the occurrence of system shutdown after long term storage of batteries. A semiconductor device comprises a control unit that controls charging and discharging of a battery cell, and a ROM that stores a power supply capability value which specifies a power supply capacity of the battery cell that can be stably supplied to an application system in which the battery pack is provided. After the battery pack returns from the sleep mode and before the transmission request of the power supply capability value is received from the system, the control [unit performs a power supply capability value updating process of updating the power supply capability value in the ROM to a value smaller than the power supply capability value before the sleep mode.