Energy Storage Management Apparatus Voltage Control
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Solution Overview
Problem
In energy storage systems where multiple devices are connected in series, voltage variations lead to some devices being charged beyond their protection voltage, causing interruptions during charging.
Innovation Solution
A management apparatus with a control unit that monitors and lowers the charge voltage when any device exceeds a threshold, preventing voltage overload by stepwise adjustments and allowing discharge to equalize voltages, thus maintaining safe charging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charge voltage is not lowered when voltage threshold is reached, then charge continues at high speed, but voltage of energy storage devices exceeds protection voltage causing charge interruption
Solution Approach 1:
The charge voltage is dynamically adjusted based on the voltage state of energy storage devices. The control unit monitors cell voltages in real-time and dynamically lowers the charge voltage when any device reaches the first threshold, then restores it when voltages equalize, creating a dynamic charging process that maintains both speed and safety
Solution Approach 2:
The charge voltage parameter is changed from a fixed high value to a variable value that decreases when voltage thresholds are reached. By changing the voltage parameter dynamically based on device state, the system prevents overvoltage while maintaining efficient charging during normal operation
2Reliability
If charge voltage is lowered to prevent voltage overload, then voltage safety is maintained, but charge time increases
Solution Approach 1:
The charge voltage is lowered periodically only when necessary (when voltage thresholds are reached) and restored when voltages equalize. This periodic adjustment rather than continuous lowering minimizes the impact on charge time while maintaining voltage safety throughout the charging process
Solution Approach 2:
The control unit detects voltage thresholds in advance and proactively lowers the charge voltage before overvoltage conditions occur. This preliminary action prevents voltage exceedance while maintaining efficient charging, avoiding the need for complete charge interruption
3Reliability
If charge is interrupted when voltage exceeds threshold, then voltage safety is ensured, but charging cannot continue
Solution Approach 1:
Instead of static charge interruption, the system dynamically adjusts charge voltage downward when thresholds are reached and restores it when devices equalize. This dynamic approach allows charging to continue throughout the process while maintaining protective voltage limits, ensuring both safety and continuity
Data Source
AI summary
A management device 21 comprising a main control part 23 that, during charging of a plurality of power storage elements 41 connected in series, outputs a first pull-down signal to a converter 11 so as to lower a charging voltage when the cell voltage of any of the power storage elements 41 is equal to or greater than a first threshold value.