Dynamic High Voltage Battery Output Control for Eco-Friendly Vehicles
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Solution Overview
Problem
Conventional methods for controlling high voltage battery output in eco-friendly vehicles fail to prevent voltage drops during prolonged discharge, leading to potential vehicle immobilization, as they rely on pre-stored power maps that become ineffective beyond a certain time frame.
Innovation Solution
A system that dynamically controls available charge and discharge power of high voltage batteries based on information such as duration, accumulated amount, and required output, using a controller to adjust power limits and maintain optimal performance by calculating real-time power ratios and applying discharge or charge power limiting factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the available power map is used to control high voltage battery output, then the battery output can be controlled according to temperature and state of charge, but the battery voltage sharply drops during prolonged discharge leading to vehicle immobilization
Solution Approach 1:
The patent transitions from a static power map approach to a dynamic control system that continuously adjusts available power based on real-time battery state (temperature, SOC, discharge duration). The controller dynamically recalculates available charge and discharge power limits as discharge progresses, preventing voltage collapse while adapting to changing battery conditions throughout the discharge period.
Solution Approach 2:
The system implements feedback control by continuously monitoring actual battery voltage, current, and discharge duration, then comparing these against predicted values from the power map. When deviations are detected (indicating approaching voltage limits), the controller adjusts the available power limits accordingly, creating a closed-loop system that prevents voltage collapse while maximizing usable discharge capacity.
2Reliability
If the available power map is used to control high voltage battery output, then the battery can be protected within a reference time frame, but the power map becomes meaningless beyond that time frame requiring abrupt power limiting
Solution Approach 1:
The system uses the power map to predict future battery states and available power limits before discharge actually occurs. By calculating expected voltage drops and power availability based on current SOC and temperature, the controller proactively adjusts power limits to prevent future voltage collapse, rather than reactively limiting power only after the reference time frame expires.
Solution Approach 2:
The patent extends the applicability of the power map by introducing discharge duration as a dynamic parameter that modifies available power calculations. Instead of using fixed time-frame limits, the system continuously updates the effective reference time based on how long discharge has been occurring, allowing the power map to remain valid and useful throughout extended discharge periods by adapting its parameters to current operating conditions.
3Reliability
If the available power map is used to control high voltage battery output, then the battery can operate within safe parameters, but the vehicle cannot receive excess power when needed reducing power performance
Solution Approach 1:
The system dynamically adjusts available power limits based on real-time discharge duration and battery state, allowing higher power availability during early discharge when voltage is stable, then progressively reducing limits as discharge progresses and voltage approaches critical thresholds. This creates a time-varying power envelope that maximizes power delivery when safe while preventing voltage collapse.
Solution Approach 2:
The patent modifies the power map parameters to account for discharge duration, allowing the system to provide excess power when battery conditions permit (early in discharge, favorable temperature and SOC) while maintaining safety constraints. The available power is no longer a fixed value from the map but a dynamically calculated value that incorporates how long discharge has been occurring, enabling higher power delivery during periods when the battery can safely accommodate it.
Data Source
AI summary
A system of controlling an output of a high voltage battery for an eco-friendly vehicle includes: the high voltage battery mounted in the eco-friendly vehicle; a storage configured to store information on maximum available charge and discharge power according to a temperature and a state of charge (SOC) of the high voltage battery; and a controller configured to control available charge power and available discharge power of the high voltage battery based on at least one of information on a charge duration and a discharge duration of the high voltage battery, information on an accumulated charge amount and an accumulated discharge amount of the high voltage battery, and information on a requested output amount of the vehicle.