Battery Pack Preconditioning Using Charging-State Thermal Control
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Solution Overview
Problem
Electric vehicle battery packs face increased power consumption for thermal management, which reduces driving mileage, especially when heating or cooling demands are high, and existing solutions do not efficiently manage thermal demands without consuming battery power.
Innovation Solution
A method for intelligent thermal management of battery packs that determines target temperatures based on the connection state of the charging interface and calculates optimal thermal management starting times to minimize power consumption, using either external charging devices or self-heating methods to pre-heat or pre-cool the battery packs before use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal management is performed using the power of the battery pack, then the battery pack temperature is maintained within suitable range, but the power consumption of the battery pack increases
Solution Approach 1:
The system performs preliminary thermal management actions by pre-heating or pre-cooling the battery pack before the user intends to use the vehicle. The controller receives user input about planned usage time and initiates thermal management operations in advance, allowing the battery to reach optimal temperature before needed while using external power sources rather than depleting battery power reserves.
Solution Approach 2:
The system introduces an intermediary external power source (charging device or commercial power supply) to perform thermal management tasks. Instead of using the battery pack's own power for heating or cooling, the system mediates through external power sources that can provide the necessary energy for thermal management without consuming the battery's operational power reserves.
2Reliability
If the battery pack is pre-heated or pre-cooled before use, then the battery performance is optimized, but the charging time or preparation time increases
Solution Approach 1:
The system performs preliminary thermal management actions by pre-heating or pre-cooling the battery pack before the user intends to use the vehicle. The controller receives user input about planned usage time and initiates thermal management operations in advance, allowing the battery to reach optimal temperature before needed while using external power sources rather than depleting battery power reserves.
Solution Approach 2:
The system dynamically adjusts the thermal management strategy based on real-time conditions including ambient temperature, battery state of charge, and user's planned usage time. The controller continuously monitors these parameters and adapts the heating or cooling intensity and duration to achieve optimal battery performance with minimal impact on charging time, balancing performance requirements with time constraints.
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 battery pack power consumption, increases driving mileage by optimizing thermal management, and improves user experience by considering user demands and travel habits.
Implementation Method 1
perform heating on the battery pack before the power supply so as to raise a temperature of the battery pack
Implementation Method 2
perform cooling on the battery pack after the power supply when a temperature of the battery pack exceeds the range
Data Source
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AI summary
The present application discloses a thermal management method for a battery pack. The method includes: under a condition that an electric vehicle is in a stationary state, obtaining a power-on time of the battery pack in the electric vehicle; under a condition of determining that the battery pack has a thermal management demand, determining a target temperature of the battery pack according to a connection state of a charging interface of the electric vehicle and a charging device; determining a thermal management starting time of the battery pack based on the target temperature of the battery pack and the power-on time; and under a condition that the thermal management starting time arrives, performing thermal management on the battery pack so that a temperature of the battery pack reaches the target temperature before the power-on time arrives. The thermal management method for the battery pack provided according to the present application can increase the driving mileage of the battery pack.