Fuel Cell Power Distribution via Dynamic Rate Control
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Solution Overview
Problem
Current fuel-cell vehicles rely on lithium-ion batteries as auxiliary power due to the fuel cell's low power change rate, leading to inefficient energy distribution and resource utilization, with large batteries prolonging service life but increasing weight and cost, and small batteries reducing service life but saving resources.
Innovation Solution
A method optimizing power distribution by selecting optimal fuel-cell power change rates and time windows to minimize lithium-ion battery SOC fluctuation, allowing for rational resource allocation and extended application range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-electric-quantity lithium-ion battery is equipped in the fuel-cell vehicle, then the SOC fluctuation range of the lithium-ion battery will be small and service life will be prolonged, but the vehicle weight and cost will increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the fuel-cell power change rate based on operating conditions and time windows. This optimization enables the system to maintain stable battery SOC within a smaller range, thereby extending battery service life without requiring an oversized battery capacity, thus avoiding excessive vehicle weight increase.
2Reliability
If a large-electric-quantity lithium-ion battery is equipped in the fuel-cell vehicle, then the SOC fluctuation range of the lithium-ion battery will be small and service life will be prolonged, but the vehicle cost will increase
Solution Approach 1:
The patent optimizes the fuel-cell power change rate parameters to achieve efficient power distribution between the fuel cell and lithium-ion battery. This allows the system to prolong battery service life through intelligent control rather than simply increasing battery capacity, thereby reducing vehicle manufacturing cost while maintaining reliability.
3Ease of manufacture
If a small-electric-quantity lithium-ion battery is equipped in the fuel-cell vehicle, then resource allocation will be saved and vehicle price will be reduced, but the SOC fluctuation range will be increased and service life will be affected
Solution Approach 1:
The patent dynamically optimizes the fuel-cell power change rate based on different operating conditions and time windows. This parameter optimization enables small-capacity lithium-ion batteries to maintain stable SOC fluctuations within acceptable ranges, thereby extending battery service life without requiring increased battery capacity, thus keeping vehicle price low while improving reliability.
Solution Approach 2:
The patent implements dynamic adjustment of the fuel-cell power change rate according to real-time operating conditions and predetermined time windows. This dynamic control strategy allows the system to adaptively manage power distribution, ensuring that small-capacity batteries operate within optimal SOC ranges to maximize service life.
4Power
If the fuel cell is designed to meet instantaneous high current demand, then the vehicle power requirement can be satisfied, but the fuel cell cannot quickly reduce power during braking feedback and cannot recover braking energy
Solution Approach 1:
The patent introduces dynamic adjustment of the fuel-cell power change rate based on operating conditions and time windows. This enables the fuel cell to flexibly respond to power demands - maintaining high power output when needed while能够快速 reducing power during braking feedback, thereby achieving both high power capability and fast response flexibility.
Solution Approach 2:
The patent uses the lithium-ion battery as an intermediary energy storage device between the fuel cell and the motor. The battery handles instantaneous high current demands and captures braking energy during regenerative braking, while the fuel cell operates at optimized power levels, resolving the conflict between maintaining high power output and achieving fast power response flexibility.
Data Source
AI summary
A rational fuel-cell power following strategy is made according to values such as vehicle fuel-cell power, battery power, and SOC (state of charge) of a lithium-ion battery; in the same time window, effects of different fuel-cell power growth rates on SOC of the lithium-ion battery are tested according to vehicle requirements; and at the same fuel-cell growth rate, effects of different time windows on SOC of the lithium-ion battery are tested according to vehicle requirements; a proper time window and a proper fuel-cell power change rate are found, so that the SOC value of the lithium-ion battery fluctuates within a certain range. The present invention can achieve a good operation mode of power distribution between the fuel cell and the lithium-ion battery, ensuring rational utilization of resources, thereby extending the application range of the lithium-ion battery to the maximum extent.