Dual-Heater Liquid Battery Preheating for Faster Low-Temperature Warm-Up
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Solution Overview
Problem
The existing liquid heating systems for lithium ion batteries in battery packs are inefficient and slow in raising the temperature, which can lead to crystallization precipitation and short circuits when ambient temperatures are low, necessitating improved heating efficiency and speed.
Innovation Solution
A composite heating system with two heaters and a relay group connected by a controller, which switches between external power sources and battery pack power sources to optimize heating during charging and discharging, ensuring efficient temperature management through a liquid heating system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If liquid heating manner is used to heat lithium ion battery, then space inside battery box is saved by sharing heat exchange plate, but temperature rising speed of battery is relatively slow
Solution Approach 1:
The heating system is segmented into multiple independent heating zones with separate heating plates for different battery modules. Each heating zone can be controlled independently, allowing parallel heating operations that significantly increase the overall temperature rising speed while maintaining the space-efficient liquid heating architecture
Solution Approach 2:
The system performs preliminary heating of the liquid medium before it circulates to the heat exchange plates. By pre-heating the liquid in a dedicated heating chamber, the system maximizes heat transfer efficiency when the liquid contacts the battery packs, thereby accelerating temperature rise without requiring additional space in the battery box
2Speed
If PTC heating plate is used to heat lithium ion battery, then temperature rising speed is fast, but additional heating plate occupies space inside battery box
Solution Approach 1:
The liquid cooling system is designed to serve dual functions: cooling during normal operation and heating during low-temperature conditions. By integrating heating capabilities into the existing cooling infrastructure, the system eliminates the need for separate heating plates, maintaining fast heating speeds through high-power heating elements while preserving valuable battery box space
Solution Approach 2:
The system switches between different heating modes based on temperature requirements. For rapid temperature increase, high-power electric heating elements are activated; for maintenance heating, the liquid circulation system provides gentle, continuous heating. This periodic switching allows the system to achieve fast heating when needed without permanently occupying space with large heating components
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
The system significantly enhances heating efficiency and temperature increase speed by strategically controlling the first and second heaters, preventing crystallization and ensuring safe operation by maintaining optimal temperatures.
Implementation Method 1
the composite heating apparatus includes a first heater and a second heater... determine whether to start charging preheating... determine whether to start discharging preheating
Implementation Method 2
the liquid heating system comprises a heat exchanger and a composite heating apparatus connected to each other by pipelines
Data Source
AI summary
Disclosed are a composite heating system, and a heating method and heating apparatus thereof. Two heaters are provided in a heating apparatus of a liquid heating system of the composite heating system. The two heaters are connected to an external power source interface module and a battery pack output power source interface module by a relay group. In the disclosure, by controlling relays in the relay group, during charging preheating, the first heater and the second heater are able to be powered by an external power source and be self-powered by batteries in a battery pack, respectively. When the two heaters are self-powered by batteries in the battery pack, a pulse discharge manner is used, thereby increasing a heating efficiency of the liquid heating system in a low-temperature environment, and increasing a temperature increasing speed of batteries.