Vehicle Battery Power Profile Control for Flexible Discharge
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Solution Overview
Problem
Conventional battery control systems in hybrid and electric vehicles lack flexibility in determining the power capacity, as they only provide information on peak current, which is insufficient for extended power discharge requirements, limiting their ability to accurately assess and manage battery capabilities for complex power profiles.
Innovation Solution
A method and system that allows for the communication of a battery's power capacity by receiving a power profile request, determining compliance, and providing a response indicating whether the battery can meet the requested profile, with the option to suggest alternative profiles if necessary, enabling more efficient and flexible power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional peak current estimation methods are used, then the battery system provides a simple maximum available power indication, but the system lacks flexibility for extended power discharge requirements and complex power profiles
Solution Approach 1:
The invention changes the parameter being communicated from a single peak current value to a power capacity value derived from impedance measurements. This allows the battery control unit to provide comprehensive power capability information (including sustained power delivery) without increasing system complexity, as the impedance-based calculation methodology is applied to an existing measurement approach
Solution Approach 2:
The invention introduces an intermediary calculation step where impedance measurements are used to determine power capacity, which then serves as the basis for communication to the vehicle control unit. This intermediary power capacity parameter bridges the gap between simple peak current measurements and the complex power profile requirements, enabling flexible power management without direct complex profile analysis
2Productivity
If the battery control system communicates detailed power capacity information, then the vehicle system can optimize power usage, but the communication protocol and processing requirements increase
Solution Approach 1:
The invention extracts only the essential power capacity information from complex power profile analysis and communicates this single derived parameter to the vehicle control unit. This extraction approach enables the vehicle system to optimize power usage based on accurate battery capabilities without requiring the battery control system to handle complex communication protocols or process detailed power profiles
Solution Approach 2:
The battery control unit autonomously performs impedance measurements and calculates power capacity based on its own operational data. This self-service approach provides accurate power capacity information for optimizing power utilization without increasing overall system complexity, as the calculations are performed independently within the battery control unit using existing measurements
Data Source
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AI summary
The invention relates to a method which comprises communicating a power capacity of a battery of a vehicle in a system comprising a battery and a battery control unit for controlling said battery. The method further comprises, in the battery control unit, receiving a request comprising a power profile describing a power transfer to or from the battery as a function of time, determining if the battery is capable of receiving or providing power corresponding to the requested power profile.