EV Power Supply System Dynamic Switching for Battery Protection
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Solution Overview
Problem
Existing electric power supply systems for electric vehicles face challenges in managing battery charging and discharging efficiently, leading to battery deterioration due to repeated charging and discharging cycles during load driving modes, and inadequate power supply to loads when external power is limited.
Innovation Solution
An electric power supply system comprising a battery, an electric power receiving apparatus, a switching apparatus, and a control apparatus that dynamically switches between two connection states based on the output power of the electric power receiving apparatus, cutting off or coupling the load to the battery to control voltage and prevent excessive battery usage, thereby reducing deterioration and ensuring adequate power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric power receiving apparatus is always connected to the battery during load driving mode, then the battery can provide power to the load, but the battery undergoes repeated charging and discharging cycles causing deterioration
Solution Approach 1:
The patent applies dynamics by making the connection state between the electric power receiving apparatus and the battery changeable rather than fixed. The switching apparatus dynamically switches between a first connection state (connected) and a second connection state (disconnected) based on the output electric power from the receiving apparatus, allowing the system to adapt to varying power conditions and prevent unnecessary battery cycling.
Solution Approach 2:
The control apparatus preliminarily determines whether to connect or disconnect the electric power receiving apparatus from the battery based on predicted or current output electric power levels. By making this determination in advance, the system可以避免 unnecessary charging and discharging cycles before they occur, thereby protecting the battery from deterioration.
2Reliability
If the electric power receiving apparatus is disconnected from the battery, then battery deterioration is reduced, but the load may not receive adequate power when external power is limited
Solution Approach 1:
The control apparatus continuously monitors the output electric power from the electric power receiving apparatus and uses this feedback to determine the appropriate connection state. When output power exceeds a threshold, the apparatus is disconnected to protect the battery; when output power is insufficient, the apparatus is connected to ensure the load receives adequate power. This feedback mechanism balances battery protection with load power requirements.
3Adaptability or versatility
If the switching apparatus frequently changes connection state, then power management flexibility is improved, but wear on the switching apparatus increases
Solution Approach 1:
The control apparatus uses feedback from the output electric power measurements to make informed decisions about when to switch connection states. By basing switching decisions on actual power conditions rather than arbitrary timing, the system minimizes unnecessary switching operations while maintaining the flexibility to respond to genuine power management needs, thereby reducing wear on the switching apparatus.
4Reliability
If voltage control is implemented during connection, then battery protection is improved, but system complexity increases
Solution Approach 1:
The control apparatus acts as an intermediary that manages the voltage control process. It monitors the voltage during the connection state and implements control measures when necessary, providing a simple interface between the complex voltage control requirements and the rest of the power supply system. This intermediary approach protects the battery while keeping the overall system architecture relatively simple.
Data Source
AI summary
An electric power supply system includes a battery, an electric power receiving apparatus, a switching apparatus, and a control apparatus. The electric power receiving apparatus is coupled to the battery in parallel with a load, and receives and supplies external electric power to the battery. In a load driving mode, the control apparatus sets an electrical connection state of the electric power supply system to a first connection state in which connection of the electric power receiving apparatus and the load to the battery is cut off by the switching apparatus and controls a voltage of the electric power receiving apparatus depending on a voltage of the battery if output electric power of the electric power receiving apparatus is equal to or less than reference electric power, and otherwise sets the electrical connection state to a second connection state in which the connection is allowed by the switching apparatus.