Wireless Vehicle Power Control for Battery Heat and Life Balance
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Solution Overview
Problem
The increasing cost of installing secondary batteries in vehicles due to the need to enhance capacity to manage heat generation and life reduction caused by contactless power transmission and power consumption is a challenge.
Innovation Solution
A power control device with a control unit that executes first and second compensation controls to balance power input/output and match received power with travel driving force requirements, suppressing the need for increased battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacity of the secondary battery is increased to suppress heat generation and life reduction caused by contactless power transmission and power consumption, then the reliability and thermal management are improved, but the cost of installing the secondary battery increases
Solution Approach 1:
The system dynamically switches between contactless power transmission mode and contact-based charging mode based on real-time power requirements. The power receiving device activates the contactless power reception unit during high-power需求的 travel driving, while using the secondary battery for auxiliary power needs, thereby optimizing the battery's workload and reducing thermal stress without requiring oversized battery capacity.
Solution Approach 2:
The power receiving device integrates multiple power reception functions into a single system: it can receive power contactlessly during vehicle travel for propulsion needs, and also supports contact-based charging when parked. This multi-functional design allows the secondary battery to serve dual purposes - both as a power source for auxiliary systems and as an energy buffer, reducing the need for increased battery capacity.
2Reliability
If the capacity of the secondary battery is increased to manage heat generation and life reduction, then the thermal management and reliability are improved, but the device complexity increases
Solution Approach 1:
The power receiving device acts as an intermediary between the external power source and the secondary battery. It manages power flow, converts power formats, and regulates charging/discharging processes, thereby protecting the battery from direct exposure to high-stress conditions that would otherwise require oversized battery design for thermal management.
3Productivity
If contactless power transmission is used to extend cruising range, then the productivity is improved, but heat generation and power storage device degradation occur
Solution Approach 1:
The system employs periodic switching between contactless power reception and contact-based charging modes. During travel, contactless power transmission provides high-power output for propulsion. When parked or at lower power demands, the system switches to contact-based charging to top up the battery, thereby distributing thermal load and reducing continuous high-stress operation that causes degradation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces heat generation and life span degradation of the secondary battery, thereby controlling costs and enhancing energy efficiency.
Implementation Method 1
a power receiving unit (31) having a coil for receiving AC electric power transmitted from a power transmitting device (2) in a non-contact manner
Data Source
AI summary
A power control device includes a power storage device, a rotating electric machine, a power receiving unit, and a control device. The rotating electric machine generates a travel driving force of a vehicle. The power receiving device has a power receiving unit and a power converting unit. The power receiving unit includes a secondary side coil that receives AC electric power transmitted from a power transmitting device in a non-contact manner. The power converting unit includes a plurality of switching elements (transistor) connected to the secondary side coil and converts the AC electric power received by the power receiving unit into DC electric power. The power storage device is connected to the power receiving device via the power conversion device. The control device performs a first compensation control to set power balance at input/output ends of the power storage device to zero and a second compensation control to match the power received by the power receiving unit with a power required for the travel driving force.