Battery Pack Wake-Up Current Detection Calibration
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Solution Overview
Problem
Existing secondary battery packs face challenges in precisely detecting wake-up current due to temperature characteristics, leading to false detection and failure in transitioning from power saving to non-power saving states.
Innovation Solution
A battery pack configuration that includes a wake-up current detection circuit and a calibration member to reset detection voltage at specific timings, both at startup and during power saving states, to absorb temperature-induced fluctuations and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If calibration operation is performed only at startup, then device complexity is reduced, but detection precision deteriorates due to temperature fluctuations
Solution Approach 1:
The patent applies periodic action by performing calibration operations at regular intervals - specifically at startup and periodically during power-saving states. This periodic recalibration compensates for temperature-induced drift in the wake-up current detection circuit without requiring continuous calibration, thus balancing detection precision with device complexity.
2Measurement precision
If wake-up current detection circuit operates continuously, then detection precision is maintained, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the wake-up current detection circuit operational only during power-saving states rather than continuously. The circuit is activated when the main system enters low-power mode and deactivated during normal operation, dynamically adjusting its operational state to maintain detection capability while minimizing energy consumption.
Solution Approach 2:
The detection circuit operates periodically during power-saving states rather than continuously, aligning its activity with the system's power state transitions. This periodic operation maintains detection precision when needed while significantly reducing overall power consumption during normal operation.
3Measurement precision
If calibration is performed at every transition to power-saving state, then detection accuracy is improved, but productivity decreases due to frequent calibration operations
Solution Approach 1:
The patent implements periodic calibration at transitions to power-saving states, which are discrete events rather than continuous operations. This approach ensures detection accuracy is maintained at critical transition points without requiring constant calibration, thus balancing precision with system productivity and responsiveness.
Data Source
AI summary
A battery pack includes a secondary battery, a discharge controlling circuit configured to discharge the secondary battery and control an output current supplied to battery driven equipment, a wake-up current detection circuit configured to, in a power saving state in which the output current supplied to the battery driven equipment by the discharge controlling circuit is reduced from a normal non-power saving state, detect that the output current exceeds a wake-up current threshold to make the battery pack transition from the power saving state to the non-power saving state, and a calibration member configured to calibrate a reference point of the wake-up current detection circuit. The wake-up current detection circuit is configured to operate in the power saving state and stop its operation in the non-power saving state, and the calibration member is configured to execute a calibration operation at a predetermined timing in the power saving state.