Power Storage System Temperature Control for Parallel Rack Resistance
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Solution Overview
Problem
Temperature differences among power storage racks connected in parallel lead to variations in internal resistances, causing uneven current flow and reduced power supply capacity due to limitations in allowable current per rack.
Innovation Solution
A power storage system with temperature adjustment units and a management unit that controls these units to equalize the resistances of power storage module groups by cooling or heating, ensuring consistent current flow across all racks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power storage racks are connected in parallel to increase power supply capacity, then the overall power output is improved, but temperature differences cause resistance variations that reduce the actual current flow and lower the effective power supply capacity
Solution Approach 1:
The system actively changes the temperature parameter of power storage racks using heating or cooling devices. By adjusting the temperature of individual racks, the system modifies the internal resistance characteristics to achieve more uniform current distribution across all parallel-connected racks, thereby resolving the contradiction between maintaining high power supply capacity and ensuring reliable current flow consistency.
2Reliability
If the allowable current is set according to the highest temperature rack, then safety is maintained, but racks with lower temperature and higher resistance cannot contribute their full potential, reducing overall system efficiency
Solution Approach 1:
The system dynamically adjusts the temperature parameter of individual power storage racks using heating or cooling devices. By raising the temperature of cooler racks, their internal resistance decreases, allowing them to contribute more current. This enables the system to operate at higher overall efficiency while maintaining safety through active temperature management of each rack.
Solution Approach 2:
The system applies different temperature adjustment treatments to different racks based on their individual temperature conditions. Instead of uniform treatment, each rack receives localized heating or cooling to achieve optimal temperature and resistance characteristics, allowing each component to operate at its best performance level while maintaining overall system safety.
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 solution reduces current variations among power storage modules connected in parallel, allowing for maximum power supply capacity by ensuring all racks operate within their allowable current limits.
Implementation Method 1
The internal resistance of the power storage module becomes larger as its temperature becomes lower. When a temperature difference exists among the power storage racks connected in parallel, a variation occurs in internal resistances of the power storage modules due to the temperature difference
Data Source
AI summary
A power storage unit includes a plurality of power storage module groups connected in parallel, each having a plurality of power storage modules connected in series or in series and parallel. A plurality of temperature adjustment units is installed in each of the power storage module groups constituting the power storage unit, and cools or heats the power storage module groups. A management unit controls the plurality of temperature adjustment units corresponding to each of the power storage module groups to make resistances of the plurality of power storage module groups come close.