Secondary Battery Power Control via Sensor Failure Detection
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Solution Overview
Problem
Existing input/output power control systems for secondary batteries fail to effectively manage power when either the current sensor or voltage sensor fails, leading to reduced driving force in vehicles and an unpleasant driving experience due to uncontrolled power reduction.
Innovation Solution
An input/output power control apparatus and method that includes a current sensor, voltage sensor, sensor failure detection, allowable power calculation, and power control units to limit input/output powers based on the detected values from functioning sensors, preventing excessive discharge or charge and maintaining vehicle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input/output current is reduced to a predetermined value when sensor failure is detected, then the secondary battery is protected from excessive discharge or charge, but the driving force of the driving motor is always reduced causing unpleasant feeling to the vehicle driver
Solution Approach 1:
The patent changes the control parameter from a fixed predetermined current value to a dynamically calculated allowable current value based on the charge state (SOC) of the battery. When sensor failure is detected, the system calculates the allowable input/output current according to the battery's charge state, enabling the current to vary with battery conditions rather than being fixed, thus resolving the contradiction between protection and performance.
2Reliability
If the input/output current is reduced to a predetermined value during sensor failure, then the battery charge state can be controlled, but the control is not appropriate for the actual charge state of the battery
Solution Approach 1:
The patent changes the control parameter from a fixed predetermined current value to a dynamically calculated allowable current value based on the charge state (SOC) of the battery. When sensor failure is detected, the system calculates the allowable input/output current according to the battery's charge state, enabling the current to vary with battery conditions rather than being fixed, thus resolving the contradiction between protection and performance.
Solution Approach 2:
The system implements feedback control by continuously monitoring the battery's charge state and adjusting the allowable current accordingly. The battery management unit calculates the allowable input/output current based on the charge state, creating a closed-loop control system that adapts to changing battery conditions, thereby improving control adaptability while maintaining protection.
Data Source
AI summary
In input/output power control apparatus and method for a secondary battery, in a case where neither a current sensor nor a voltage sensor fails, allowable input/output powers which are an allowable input power by which the secondary battery allowably inputs and an allowable output power by which the secondary battery allowably outputs are calculated on the basis of an input and/or output current and a terminal voltage of the secondary battery and, in a case where the failure in either one of the current sensor and the voltage sensor is detected, the allowable input/output powers are calculated on the basis of a detected value of one of the current and voltage sensors in which no failure is detected, and each of input and output powers of the secondary battery is limited to be equal to or smaller than the corresponding one of the allowable input/output powers.