Battery Fuel Gauge Dynamic Parameter Update Rates
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Solution Overview
Problem
Inaccurate battery state estimation leads to potential battery damage, data loss, and inefficient usage due to the recursive relationship between battery parameters and state of charge, making it challenging to balance parameter updating frequency with battery performance.
Innovation Solution
The battery fuel gauge circuitry updates parameters at multiple rates, increasing the update interval when the battery state is high and decreasing it as the battery nears discharge termination, optimizing power consumption and accuracy to prevent premature shutdowns and data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If parameter update rate is increased to improve battery state estimation accuracy, then measurement precision is improved, but use of energy increases due to higher power consumption from frequent updates
Solution Approach 1:
The patent implements dynamic parameter update rates that adapt based on battery state. When the battery is in high-state-of-charge conditions, updates occur at a lower rate to conserve energy. When the battery approaches discharge termination, the update rate increases to improve accuracy for shutdown decisions. This dynamic adjustment resolves the contradiction by making the update rate variable rather than fixed.
Solution Approach 2:
The patent changes the update rate parameter based on battery state conditions. By monitoring battery parameters and adjusting the update frequency accordingly, the system optimizes the balance between measurement precision and energy consumption. The update rate is increased only when necessary (near discharge termination) and decreased when the battery is in safer states.
2Measurement precision
If parameter update interval is decreased to improve battery state estimation accuracy, then measurement precision is improved, but duration of action decreases due to shorter battery discharge time
Solution Approach 1:
The system dynamically adjusts the parameter update interval based on battery state. During most of the discharge cycle, a longer update interval is used to maximize battery discharge time. As the battery approaches termination, the interval decreases to ensure accurate shutdown timing. This dynamic approach prevents premature shutdown while maximizing overall discharge duration.
Solution Approach 2:
The update interval parameter is changed based on battery state conditions. The system transitions from infrequent updates (longer intervals) during high-state-of-charge periods to frequent updates (shorter intervals) near discharge termination. This parameter change strategy resolves the contradiction by optimizing the interval for each operational phase.
3Reliability
If battery fuel gauge circuitry indicates zero remaining capacity early to prevent data loss, then reliability is improved, but productivity decreases due to inefficient battery usage
Solution Approach 1:
The patent implements dynamic threshold adjustment for shutdown decisions. Rather than using a fixed early-warning threshold that triggers shutdown conservatively, the system dynamically determines the appropriate shutdown point based on real-time battery state estimation. This allows the system to maintain reliability by preventing data loss while improving productivity by utilizing the battery more fully.
Solution Approach 2:
The system uses feedback from continuous battery parameter monitoring to make intelligent shutdown decisions. By analyzing multiple battery parameters and their relationships, the fuel gauge circuitry can predict the true discharge termination point more accurately. This feedback mechanism allows the system to delay shutdown until it is truly necessary, preventing both data loss and unnecessary early termination.
Data Source
AI summary
Monitoring a state of a rechargeable battery involves repeatedly obtaining at least one measured value related to the battery during discharge of the battery; repeatedly calculating the state of the battery during discharge of the battery based on a previously calculated state of the battery, the measured value and at least one parameter of the battery; before the state of the battery passes a threshold value, updating the parameter of the battery at a first rate; after the state of the battery passes the threshold value, updating the parameter of the battery at a second rate, faster than the first rate; and correcting the state of the battery in response to each update of the parameter.