Parallel Battery Temperature Control for LFP-Ternary Output Balance
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Solution Overview
Problem
In battery management systems with multiple types of batteries connected in parallel, variations in input/output characteristics due to differing internal resistances become significant, especially at low temperatures, leading to performance deviations between different battery types.
Innovation Solution
A battery management system that includes temperature control mechanisms to maintain the LFP battery at a higher temperature than the ternary battery when temperatures are low, adjusting charge and discharge power and using heaters to achieve this, thereby minimizing performance deviations between battery types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple types of batteries with different internal resistances are connected in parallel, then the battery system can provide higher power output, but the input/output characteristics vary significantly between different battery types especially at low temperatures
Solution Approach 1:
The patent applies local quality by implementing temperature control specifically for the LFP battery unit, which has higher internal resistance and poorer low-temperature performance. The control device independently adjusts the temperature of each battery unit based on its specific characteristics, rather than treating all batteries uniformly. This localized approach allows the LFP battery to maintain optimal operating temperature and performance while other battery types operate normally.
Solution Approach 2:
The patent changes the temperature parameter of the LFP battery to compensate for its inherently higher internal resistance. By actively controlling and maintaining the LFP battery at a higher temperature than other battery types, the system alters the operating parameters to achieve more uniform input/output characteristics across different battery types, especially in low-temperature environments.
2Loss of energy
If the LFP battery operates at low temperature, then the battery system can maintain lower operating costs, but the input/output characteristics of the LFP battery deteriorate due to higher internal resistance
Solution Approach 1:
The control device performs preliminary temperature control on the LFP battery before it is needed for high-power output. By pre-heating or maintaining the LFP battery at an appropriate temperature, the system ensures that when the battery needs to deliver power, it is already in an optimal state, avoiding performance deterioration that would occur if it operated cold and then needed to suddenly increase output.
Solution Approach 2:
The control device continuously monitors the temperature and input/output characteristics of the LFP battery, and adjusts the temperature control strategy based on real-time feedback. This closed-loop control ensures that the LFP battery maintains optimal performance while minimizing energy consumption for heating, balancing operating costs with performance requirements.
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 effectively suppresses variations in input/output characteristics between LFP and ternary batteries by optimizing temperature control, ensuring consistent performance across different battery types, even at low temperatures.
Implementation Method 1
the first battery unit further includes a heater for heating the LFP battery, and the first temperature control includes control of heating the LFP battery with the heater
Implementation Method 2
the increase amount of the temperature of the LFP battery due to the charge and discharge power can be made higher than the increase amount of the temperature of the ternary battery due to the charge and discharge power
Data Source
AI summary
The battery management system includes a plurality of battery units connected in parallel to each other, and a control device that executes temperature control for each battery of the plurality of battery units. The plurality of battery units includes a first battery unit having a LFP cell and a second battery unit having a ternary battery. When the temperature of the battery management system 1 is equal to or lower than the reference temperature, the control device executes the first temperature control so that the temperature of LFP cell is higher than the temperature of the ternary cell.