NaS Battery Control Apparatus for Temperature Imbalance
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Solution Overview
Problem
Conventional control systems for sodium-sulfur batteries often experience temperature imbalances, where one battery reaches its upper limit temperature while another falls below it, leading to inefficient power emission and potential damage.
Innovation Solution
A control apparatus and method that allocates emission power to secondary batteries based on their state-of-charge, internal resistance, and temperature, using upper limit calculations and priority segmentation to maintain all batteries within a safe temperature range, ensuring balanced operation and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If emission power is allocated without considering individual battery temperature and state-of-charge, then total power emission can be maximized, but temperature imbalance occurs where one battery reaches upper limit temperature while another falls below it
Solution Approach 1:
The patent applies local quality by allocating emission power to each battery based on its individual characteristics (temperature, state-of-charge, internal resistance) rather than uniform allocation. The control apparatus calculates a second upper limit for each battery individually, ensuring that each battery operates within its own optimal temperature range while contributing to total power emission.
Solution Approach 2:
The patent implements dynamic allocation of emission power by continuously monitoring battery temperature, state-of-charge, and internal resistance, and adjusting the second upper limit for each battery in real-time. This dynamic adjustment allows the system to maximize total power emission while preventing temperature imbalance across the battery group.
2Productivity
If emission power is allocated to maximize continuous discharge, then productivity increases, but temperature control and battery safety are compromised
Solution Approach 1:
The patent applies preliminary action by calculating the second upper limit for each battery before discharge begins, based on predicted temperature rise from exothermic reactions and current state-of-charge. This pre-calculation ensures that emission power allocation maintains both continuous discharge capability and temperature control reliability from the start of operation.
Solution Approach 2:
The patent implements feedback by continuously monitoring battery temperature, state-of-charge, and internal resistance during discharge, and using this information to adjust the second upper limit for each battery. This feedback mechanism ensures that productivity is maximized while maintaining reliable temperature control and battery safety throughout the discharge process.
3Device complexity
If conventional control methods are used, then system complexity is reduced, but temperature imbalance causes premature stopping of power emission
Solution Approach 1:
The patent applies segmentation by dividing the control of emission power into individual battery-level control units. Each battery has its own calculated second upper limit based on its specific characteristics, allowing independent optimization of each battery's discharge profile. This segmentation prevents temperature imbalance from causing premature system-wide stopping while maintaining manageable control complexity through modular battery-level control.
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 effectively prevents temperature imbalances, allowing continuous discharge and charging while maintaining battery health, ensuring efficient power emission and uniform cycle usage across all batteries.
Implementation Method 1
secondary batteries that cause an exothermic reaction at the time of discharging
Implementation Method 2
cause an endothermic reaction at the time of charging
Data Source
Figure 1A~1D
Figure 2A~2D
Figure 3A~3D
AI summary
Provided is a control apparatus that inhibits imbalance such that a temperature of one secondary battery reaches an upper limit temperature whereas a temperature of another secondary battery falls to well below the upper limit temperature. A first upper limit and a second upper limit of emission power are set in each of the NaS batteries. The second upper limit is maximum value of the emission power for maintaining the temperature of the NaS battery at an upper limit temperature or less. In allocation of the emission power to each of the NaS batteries, each of the NaS batteries is separated into a preferential virtual battery to which a non-excess of the emission power that does not exceed the second upper limit is allocated and non-preferential virtual battery to which an excess of the emission power that exceeds the second upper limit is allocated, and after the emission power is allocated to all the preferential virtual batteries, the emission power is allocated to each of the non-preferential virtual batteries.