Battery Control System Temperature Difference Current Regulation
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Solution Overview
Problem
In battery packs with multiple units connected in series, voltage differences due to temperature variations can lead to over-discharge or over-charge of individual units, resulting in unstable power extraction and potential damage.
Innovation Solution
A battery control system that includes a temperature measurement unit and a battery control unit, which identifies the lowest and highest temperature units and adjusts the charge or discharge process by outputting a signal when a significant temperature difference is detected, allowing the load control unit to reduce current and prevent over-discharge or over-charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discharge is performed continuously at high rate, then power extraction is maximized, but temperature difference between battery units increases causing over-discharge and unstable power extraction
Solution Approach 1:
The control unit continuously monitors temperature of each battery unit and uses this feedback to adjust discharge current. When temperature difference between units exceeds a threshold, the system reduces current to prevent over-discharge, ensuring stable power extraction while maintaining high productivity
Solution Approach 2:
The discharge current is dynamically adjusted based on real-time temperature conditions. The system transitions from constant high-rate discharge to variable current discharge, optimizing power extraction while preventing temperature-induced reliability issues
2Reliability
If discharge is terminated when any battery unit reaches over-discharge voltage, then over-discharge protection is provided, but residual capacity in other battery units is wasted
Solution Approach 1:
The system applies different discharge termination criteria to different battery units based on their individual temperature characteristics. Each unit is monitored independently, allowing the system to continue discharging units that can tolerate higher discharge rates while protecting temperature-sensitive units, thereby maximizing overall power extraction
3Reliability
If temperature monitoring and control is implemented, then over-discharge and over-charge prevention is achieved, but system complexity increases
Solution Approach 1:
The control unit automatically adjusts discharge current based on temperature feedback without requiring external intervention. The system monitors its own temperature state and self-regulates to prevent over-discharge and over-charge, maintaining reliability while minimizing operational complexity
Data Source
AI summary
A plurality of battery cells (100) are connected in series to each other. A temperature measurement unit (300) measures temperatures of two or more battery cells (100). A battery control unit (400) controls charge and discharge of the battery cells (100) on the basis of the temperatures measured by the temperature measurement unit (300). In addition, when the charge of the battery cells (100) is performed or the discharge of the battery cells (100) is performed, the battery control unit (400) specifies a lowest temperature cell having the lowest temperature and a highest temperature cell having the highest temperature, on the basis of the temperatures measured by the temperature measurement unit (300). In addition, the battery control unit (400) continues the charge or discharge, as it is, when a first condition in which a temperature difference ΔT between the highest temperature cell and the lowest temperature cell is equal to or greater than a reference value T1 is not satisfied. On the other hand, when the temperature difference ΔT satisfies the first condition, the battery control unit (400) outputs a first signal.