Battery Power Calculation Using Temperature and Resistance Prediction
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Solution Overview
Problem
Existing battery management systems struggle to efficiently manage energy in vehicles by limiting power when the battery reaches its maximum temperature, leading to inefficient energy use.
Innovation Solution
An apparatus and method that include a timer, temperature sensor, and controller to calculate the resistance of a battery cell, determining an optimal current value that prevents the battery from exceeding a threshold temperature, using correction coefficients based on temperature and state of charge (SOC) changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power is used to the maximum until the limit temperature of the battery is reached, then the power output is maximized, but the energy management efficiency deteriorates due to rapid power limitation afterward
Solution Approach 1:
The system performs preliminary calculation of the temperature rise rate and predicts future temperature trends before the battery reaches its limit temperature. By calculating the resistance change rate and projecting temperature progression, the system determines an appropriate power limitation in advance, rather than waiting for the temperature limit to be reached and then abruptly limiting power. This preliminary action allows for smoother power management and maintains energy efficiency.
2Temperature
If power is collectively limited to a prescribed value when the battery reaches the limit temperature, then the battery temperature is controlled, but the vehicle cannot efficiently manage energy
Solution Approach 1:
The system dynamically adjusts the power limitation based on real-time battery conditions. Instead of applying a fixed prescribed power limit when the temperature threshold is reached, the controller continuously monitors the temperature rise rate, resistance changes, and SOC (state of charge) to calculate an adaptive power limitation. This dynamic approach allows the system to maintain the highest possible power output that keeps the battery temperature within safe limits, thereby improving energy management efficiency while still controlling temperature.
3Device complexity
If the resistance of the battery cell is calculated without correction, then the calculation is simple, but the accuracy of current value determination deteriorates due to temperature and SOC changes
Solution Approach 1:
The system changes the resistance parameter based on temperature and SOC conditions. The controller calculates the battery cell resistance and applies correction coefficients that account for temperature variations and SOC levels. These correction coefficients are derived from pre-stored data or real-time measurements, allowing the resistance value to adapt to changing battery conditions. This parameter adjustment significantly improves the accuracy of current value determination without requiring complete recalculation of the resistance model.
4Duration of action of moving object
If the target time for battery use is extended, then the energy utilization is improved, but the battery may exceed the threshold temperature
Solution Approach 1:
The system implements continuous feedback monitoring of battery temperature, resistance, and SOC during the target time period. The controller calculates the temperature rise rate and compares it against safety thresholds, continuously adjusting the power output to maintain the battery within safe temperature limits throughout the extended usage period. This feedback mechanism allows the system to safely extend battery usage duration by dynamically responding to temperature changes and preventing threshold exceedance.
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 allows for maintaining the battery at an appropriate temperature during a target time, enabling efficient energy management in vehicles by calculating an optimal power value without reaching the limit temperature.
Implementation Method 1
a temperature sensor configured to measure a temperature of the battery cell
Implementation Method 2
heat generated from a time that the battery cell is at a current temperature until a time that the battery cell reaches the threshold temperature
Data Source
AI summary
An apparatus for calculating battery power including a time setting unit that sets a target time for using a battery cell, a temperature sensor unit that measures temperature of the battery cell, a resistance calculation unit that calculates resistance of the battery cell, and a power calculation unit that calculates an optimum current value usable without exceeding threshold temperature of the battery cell during the target time, based on the temperature and resistance of the battery.