Vehicle Battery Preheating Matched to Charger Power and Travel Time
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Solution Overview
Problem
Lithium batteries in electric vehicles experience decreased performance and charging efficiency at low temperatures, leading to prolonged charging times and user inconvenience due to the chemical characteristics of lithium cells, which affect the conductivity of electrolytes and electrode materials.
Innovation Solution
A vehicle battery preheating method that dynamically adjusts heating power based on estimated heating duration and traveling duration to ensure the battery reaches the target temperature synchronously with the vehicle's arrival at the charging station, optimizing heating efficiency and reducing charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the battery is heated at high power to reach target temperature quickly, then the heating speed is improved, but the energy consumption increases and may cause overheating
Solution Approach 1:
The heating power is dynamically adjusted based on real-time temperature monitoring and predicted arrival time. The system transitions from high-power heating when temperature is low to reduced-power heating as target temperature approaches, optimizing both heating speed and energy consumption throughout the heating process
Solution Approach 2:
The system continuously monitors battery temperature and compares it with the target temperature, adjusting the heating power accordingly. This closed-loop feedback mechanism prevents overheating while maintaining efficient heating by reducing power when the temperature approaches the target
2Reliability
If the battery is heated to reach target temperature before arrival, then the charging performance is improved, but the heating may not be complete if arrival is earlier than expected
Solution Approach 1:
The system performs preliminary heating actions based on predicted arrival time, but maintains the capability to adjust heating duration dynamically. The heating process is prepared in advance but can be extended or reduced based on actual travel conditions, ensuring optimal charging performance regardless of arrival timing
Solution Approach 2:
The heating strategy dynamically adapts to actual travel time by continuously monitoring vehicle position and adjusting heating power and duration. This allows the system to extend heating if travel is delayed or reduce heating if arrival is earlier, maintaining adaptability to varying travel conditions
3Productivity
If the heating power is increased to ensure battery reaches target temperature, then the charging efficiency is improved, but the vehicle may arrive at charging pile before heating is complete
Solution Approach 1:
The system uses the vehicle's motion during travel to perform the heating function, converting travel time into productive heating time. This eliminates the need for separate preheating stops and ensures heating is completed during normal vehicle operation, avoiding additional waiting time at the charging pile
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 method improves battery heating efficiency, reduces charging duration, and enhances overall charging performance by ensuring the battery is at the optimal temperature when the vehicle arrives at the charging station, thus addressing the low-temperature limitations of lithium batteries.
Implementation Method 1
heating the battery according to the current estimated heating duration and a traveling duration
Data Source
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AI summary
A vehicle battery preheating method, the method includes: determining (S 1 1) a target charging pile for charging a battery of a vehicle; estimating (S12), in a process of the vehicle traveling to the target charging pile, a remaining electric quantity for a time of the vehicle traveling to the target charging pile; determining (S13) a target temperature of the battery according to charging power of the target charging pile and the remaining electric quantity; determining (S14) a current first target heating rate of the battery, and determining a current estimated heating duration of the battery from a current temperature to the target temperature according to the current first target heating rate; and heating (S15) the battery according to the current estimated heating duration and a traveling duration of the vehicle traveling to the target charging pile.