Battery Fuel Gauging via Intermittent Voltage Sampling
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Solution Overview
Problem
Existing battery fuel gauging systems have high power consumption and cannot autonomously correct long-term charge offset errors, limiting precision and requiring abrupt charge updates during sleep or low-power modes, and are restricted to being located inside the battery.
Innovation Solution
A battery fuel gauging system with a battery voltage collecting module and microprocessor module that estimates remaining charge using a built-in battery model, allowing intermittent operation and location inside or outside the battery, utilizing a relational table or polynomial set to calculate open-circuit voltage and charge based on terminal voltage and SOC-OCV relations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling module works in a continuously active state to monitor current in real time, then the charge amount can be accurately accumulated, but the system's overall power remains at a relatively high level
Solution Approach 1:
The patent implements periodic sampling of terminal voltage at predetermined time intervals instead of continuous monitoring. The microprocessor module samples the terminal voltage periodically, calculates open-circuit voltage based on sampled values and battery models, and updates charge status periodically. This periodic action maintains measurement functionality while allowing the system to enter low-power states between sampling intervals, directly resolving the contradiction between continuous monitoring accuracy and power consumption.
2Ease of operation
If the battery fuel gauging system is located inside the battery, then it can be directly powered by the battery, but it cannot be set outside the battery
Solution Approach 1:
The patent designs the battery fuel gauging system with universal adaptability to function both inside and outside the battery. The system includes a voltage collecting module that can collect terminal voltage regardless of location, and a microprocessor module that processes this voltage to calculate open-circuit voltage and charge status. The system can be configured in different locations (inside or outside the battery) and can power itself from the battery when inside, or from external power sources when outside, making it universally applicable to different installation scenarios.
3Productivity
If charge correction is performed in an abrupt manner during sleep mode, then the charge update is immediate, but the display of the charge level changes abruptly when the electronic device is switched on or off
Solution Approach 1:
The patent performs charge correction calculations during the transition period before the device fully enters or exits sleep mode, rather than abruptly during mode switching. The microprocessor module calculates open-circuit voltage and corrects charge status based on sampled terminal voltage values obtained during mode transitions. By performing corrections preliminarily during transitions rather than abruptly during stable states, the system maintains accurate charge tracking while avoiding sudden display jumps that would occur with abrupt corrections during active or sleep modes.
Data Source
AI summary
The present disclosure discloses a battery fuel gauging system, which includes a battery voltage collecting module and a microprocessor module. An input terminal of the battery voltage collecting module is configured to collect a terminal voltage of the battery. The microprocessor module is configured to receive the terminal voltage and estimate the remaining charge in the battery. The microprocessor module estimates an open-circuit voltage of the battery according to the terminal voltage of the battery and a built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV relations of a typical lithium-ion battery. The present disclosure is capable of maintaining the precision of the battery fuel gauging system and can set the battery fuel gauging system inside or outside of the battery.