Dual Module Lithium Ion Battery Pack Cold Crank Heating
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Solution Overview
Problem
Lithium-ion batteries experience increased electrolyte viscosity and internal resistance at low temperatures due to organic solvents, leading to reduced output performance compared to lead batteries, which hinders their adoption in vehicles, especially for cold crank applications.
Innovation Solution
A lithium-ion battery pack design incorporating a first and second battery module, a heater, and switching mechanisms to efficiently heat the first battery module using energy from the second module, ensuring improved low-temperature output performance without compromising compactness and lightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium-ion battery capacity is increased to improve low temperature output performance, then the output performance is improved, but the compactness and lightness benefits are lost
Solution Approach 1:
The battery pack is divided into two separate battery modules: a first battery module optimized for high power density to provide cold crank performance, and a second battery module optimized for high energy density to provide heating energy. This segmentation allows each module to be optimized for its specific function rather than requiring a single oversized battery.
Solution Approach 2:
The patent combines two battery modules with different optimization characteristics (high power density and high energy density) into a single battery pack system. The modules work together to provide both the heating energy needed for low temperature operation and the high power output for engine starting, achieving benefits that neither module could provide alone.
2Power
If heating is applied to improve low temperature output performance, then the output performance is improved, but the State of Charge (SOC) decreases and output is diminished
Solution Approach 1:
The patent combines two battery modules with different optimization characteristics (high power density and high energy density) into a single battery pack system. The modules work together to provide both the heating energy needed for low temperature operation and the high power output for engine starting, achieving benefits that neither module could provide alone.
Solution Approach 2:
The battery pack is divided into two separate battery modules: a first battery module optimized for high power density to provide cold crank performance, and a second battery module optimized for high energy density to provide heating energy. This segmentation allows each module to be optimized for its specific function rather than requiring a single oversized battery.
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 solution enhances low-temperature output performance of lithium-ion batteries, maintaining their compactness and lightness benefits while ensuring reliable engine starting, even in cold conditions, by strategically using a high-energy density second battery module to heat a high-power density first module.
Implementation Method 1
The heater is electrically connected to the second battery module and is disposed close to the first battery module and heats the first battery module
Data Source
Figure 1
Figure 2~4
AI summary
A lithium-ion battery pack for a vehicle comprises a first battery module, a second battery module, a heater, a first switch, a second switch, and a third switch. The first battery module is connected in parallel with the second battery module. The heater is electrically connected to the second battery module and is disposed close to the first battery module and heats the first battery module. The first switch switches a power supply from the first battery module leading outward to ON or OFF, and switches a power supply from the first battery module leading outward for engine start to ON. The second switch switches a power supply from the second battery module leading outward to ON or OFF. The third switch switches a power supply from the second battery module to the heater to ON or OFF, and switches a power supply to the heater to ON before the engine start.