Battery Capacity Control Using Wake Timer for Accurate Detection
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Solution Overview
Problem
Existing methods for accurately calculating the remaining capacity of secondary batteries during power-saving mode are inadequate, leading to potential data loss and inefficient battery switching in electronic devices, as they either rely on stored current values or intermittent mode restoration, which reduces power-saving benefits.
Innovation Solution
A device and method that acquire the remaining battery capacity before entering sleep mode, calculate a restoration time based on the discharging current, and use a wake timer to restore the mode and reacquire capacity, allowing for accurate detection and switching between batteries during power-saving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electronic device enters power-saving mode to reduce power consumption, then power consumption is reduced and battery life is extended, but the remaining battery capacity cannot be accurately calculated during this mode
Solution Approach 1:
The system performs preliminary measurement of the discharge current value before entering power-saving mode and stores it in memory. This pre-measured value is then used for accurate remaining capacity calculation during the power-saving period without requiring continuous power consumption for measurement.
Solution Approach 2:
The patent introduces a dedicated remaining capacity calculation microcomputer that operates independently during power-saving mode. This intermediary component uses the pre-stored discharge current value to calculate remaining capacity, allowing the main system to remain in low-power state while capacity monitoring continues accurately.
2Measurement precision
If the remaining capacity calculating microcomputer operates during power-saving mode to calculate remaining capacity, then accurate remaining capacity detection is achieved, but power consumption increases
Solution Approach 1:
The discharge current value is measured and stored in memory before the power-saving mode begins. This preliminary action eliminates the need for continuous current measurement during power-saving mode, allowing the calculation microcomputer to operate with minimal power consumption using the pre-captured data.
Solution Approach 2:
The remaining capacity calculation microcomputer uses the discharge current value that was previously stored in the system's memory, rather than requiring continuous real-time measurement. This self-service approach allows accurate calculation while maintaining low power consumption during the extended power-saving period.
3Measurement precision
If the system intermittently restores from power-saving mode to normal mode to detect remaining capacity, then accurate remaining capacity is obtained, but the power-saving period is shortened and power-saving effect is reduced
Solution Approach 1:
The discharge current value is measured and stored before entering power-saving mode, enabling the system to maintain accurate remaining capacity calculation throughout the entire power-saving period without needing to interrupt it for measurements. This allows the power-saving mode to continue for its full intended duration.
Solution Approach 2:
The patent introduces a dedicated calculation microcomputer that operates independently during power-saving mode to perform remaining capacity calculations. This intermediary enables accurate monitoring without requiring the main system to exit power-saving mode, thus preserving the full power-saving duration and effect.
4Reliability
If shutdown is performed based on inaccurate remaining battery capacity, then the device stops operation before full discharge, but data loss may occur due to premature shutdown
Solution Approach 1:
The system performs preliminary measurement and storage of the discharge current value before power-saving mode, enabling accurate remaining capacity calculation that reliably indicates when true full discharge is approaching. This accurate information allows shutdown to be timed precisely, preventing both premature shutdown and complete discharge.
Solution Approach 2:
The patent implements a feedback mechanism where the remaining capacity calculation microcomputer continuously monitors the calculated remaining capacity during power-saving mode and provides accurate information to the shutdown control. This real-time feedback ensures shutdown is triggered at the optimal moment based on actual battery status, preventing data loss from premature shutdown while avoiding full discharge.
Data Source
AI summary
A secondary battery control device having a sleep mode includes a current detection element for detecting a charging/discharging current value of a battery, a voltage detection element for detecting an open-circuit voltage value of the battery, and a control section for calculating the remaining capacity of the battery based on the detected values. When the control section enters the sleep mode, the control section sets, in a wake timer, based on the remaining battery capacity and the discharging current value at this time, an amount of time required for the remaining battery capacity to reach a predetermined value (about 5%), as an amount of time required for the control section to be restored to a normal mode. When the set amount of time has passed, the control section is restored to the normal mode, and corrects the remaining battery capacity to obtain an accurate remaining battery capacity.