Dynamic Low Voltage Threshold Adjustment for Battery Management
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Solution Overview
Problem
Existing battery management systems often prematurely stop battery discharge when voltage drops below a low threshold, causing inconvenience due to sudden high currents, without adequately distinguishing between normal and abnormal conditions.
Innovation Solution
A method to dynamically adjust the low voltage threshold based on current state of charge and temperature, confirming if the low voltage is caused by high current, ensuring secure discharge and preventing unnecessary shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low voltage threshold is set to stop discharge when voltage drops below the threshold, then battery safety is improved, but battery availability deteriorates due to unnecessary shutdowns during high current conditions
Solution Approach 1:
The patent implements dynamic adjustment of the low voltage threshold based on real-time detection of current magnitude and temperature conditions. When high current and appropriate temperature are detected, the threshold is temporarily lowered, allowing the battery to continue discharging. This dynamic adaptation resolves the contradiction by making the protection threshold flexible rather than fixed, maintaining safety while preventing unnecessary shutdowns during normal high-current operation
Solution Approach 2:
The patent changes the voltage threshold parameter dynamically based on operating conditions (current and temperature). By adjusting this critical parameter according to real-time sensor data, the system maintains reliable protection when needed while allowing continued operation during safe high-current conditions, thus resolving the contradiction between safety and availability
2Productivity
If the low voltage threshold is lowered to allow continued discharge, then battery availability is improved, but battery safety deteriorates due to risk of excessive discharging
Solution Approach 1:
The patent dynamically adjusts the low voltage threshold parameter based on real-time detection of current and temperature conditions. The threshold is lowered only when high current and appropriate temperature are detected, and restored when conditions normalize. This conditional parameter change maintains battery availability while preserving safety through continuous monitoring and adaptive adjustment
Solution Approach 2:
The patent implements a feedback mechanism where voltage, current, and temperature sensors continuously monitor battery conditions and feed this data back to the control system. Based on this feedback, the system dynamically adjusts the low voltage threshold to allow continued discharge when safe, while automatically restoring the original threshold if unsafe conditions develop, thus maintaining both availability and safety
Data Source
AI summary
A low voltage threshold adjusting method is provided and includes the following steps: detecting whether a present voltage is lower than a low voltage threshold; detecting whether a present current exceeds a preset current threshold in response to that the present voltage is lower than the low voltage threshold; detecting whether a present temperature exceeds a preset temperature in response to that the present current exceeds the preset current threshold; checking whether a current state of charge (SOC) is higher than a preset SOC in response to that the present temperature does not exceed the preset temperature; and decreasing the low voltage threshold in response to that the current SOC is higher than the preset SOC.