EV Power Supply System Temperature Protection
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Solution Overview
Problem
In power supply systems for electric vehicles with a main power storage device and multiple sub power storage devices, the main device is prone to deterioration when only used, especially under extreme temperatures, due to unbalanced energy usage and disconnection strategies.
Innovation Solution
A power supply system with a main power storage device, sub power storage devices, and a shared voltage converter, where a control device manages the connection and disconnection of sub power storage devices based on their state of charge and temperature conditions to protect the main device, including a disconnection prohibition unit that prevents disconnection during temperature extremes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub power storage devices are disconnected from the converter when their state of charge is depleted, then the power supply system can operate with increased freedom and the main power storage device can be protected, but under extreme temperature conditions this disconnection strategy causes severe stress and deterioration to the main power storage device
Solution Approach 1:
The control device changes the operational parameters of the power supply system based on temperature conditions. When extreme temperature is detected, the control device modifies the disconnection determination criteria, preventing disconnection of sub power storage devices under these harsh conditions. This parameter change allows the system to adapt to temperature extremes, distributing the stress burden and protecting the main power storage device from severe deterioration while maintaining normal disconnection operations under favorable temperature conditions.
2Device complexity
If only the main power storage device is used for electric power input/output, then the system structure is simplified, but the main power storage device experiences accelerated deterioration especially under high or low temperature conditions
Solution Approach 1:
The system dynamically switches between using only the main power storage device and using both main and sub power storage devices based on temperature conditions. Under normal temperature conditions, the system operates in a simplified mode with only the main power storage device connected to the converter. When extreme temperature is detected, the system dynamically transitions to a dual-power-storage mode where sub power storage devices are prevented from disconnecting, thereby distributing the electrical load and reducing stress on the main power storage device, thus extending its service life while maintaining structural simplicity.
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 configuration effectively protects the main power storage device by optimizing its usage and preventing excessive stress, thereby reducing deterioration and improving the overall efficiency and longevity of the power supply system.
Implementation Method 1
a first voltage converter provided between the electric power feeding line and the main power storage device and converting voltage bidirectionally therebetween
Implementation Method 2
a second voltage converter provided between the plurality of sub power storage devices and the electric power feeding line, and converting voltage bidirectionally between a sub power storage device selected from the plurality of sub power storage devices and the electric power feeding line
Data Source
AI summary
A power supply system includes a main power storage device and a plurality of sub power storage devices. A converter is sequentially connected to one of the sub power storage devices to convert voltage between the selected sub power storage device and an electric power feeding line bidirectionally. The sub power storage device undergoes a connection switching process, and when there is no new sub power storage device remaining for replacement, then, in accordance with that sub power storage device's SOC and the vehicle's state, a request is generated to disconnect the sub power storage device. Here, when a condition regarding a temperature of at least one of the main power storage device and the plurality of sub power storage devices is satisfied, generation of a disconnection request is prohibited, in order to protect the main power storage device.