Parallel Battery Switch Control for Inrush Current Mitigation
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Solution Overview
Problem
Existing power storage systems with multiple power storage apparatuses connected in parallel face challenges in efficiently charging or discharging these units due to characteristic differences caused by aging deterioration and varying resistance values of conductive paths, leading to potential errors in voltage measurement and increased risk of inrush current or arc discharge.
Innovation Solution
A control apparatus that controls switches connecting multiple power storage apparatuses in parallel, based on respective voltage values and resistance values of conductive paths, to efficiently charge or discharge the apparatuses, thereby considering and mitigating the effects of characteristic differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple power storage apparatuses are connected in parallel to increase system capacity, then the overall energy storage capability is improved, but the risk of inrush current and arc discharge increases due to characteristic differences between individual apparatuses
Solution Approach 1:
The control apparatus measures voltage values and resistance values of conductive paths before connecting power storage apparatuses in parallel, and performs preliminary calculations to determine appropriate switch control strategies that prevent inrush current and arc discharge while enabling safe parallel operation to increase system capacity
Solution Approach 2:
The control apparatus continuously monitors voltage values and resistance values of each power storage apparatus, uses this feedback information to calculate optimal switch control actions, and dynamically adjusts the connection state of each apparatus to prevent harmful effects while maintaining system capacity
2Device complexity
If simple voltage measurement is used to control parallel power storage apparatuses, then the control system complexity is reduced, but voltage measurement errors occur due to varying resistance values of conductive paths
Solution Approach 1:
The control apparatus introduces resistance value measurements as an intermediary parameter to compensate for voltage measurement errors, using the relationship between voltage, current, and resistance to calculate accurate voltage values at the power storage apparatus terminals despite variations in conductive path resistance
Solution Approach 2:
The control apparatus changes from simple voltage measurement to a multi-parameter measurement approach that includes both voltage and resistance values, and uses calculated parameters derived from these measurements to achieve accurate voltage determination and improve measurement precision without excessive system complexity
Data Source
AI summary
A power storage system includes a plurality of power storage apparatuses and a control apparatus. The plurality of power storage apparatuses are connected in parallel to each other via respective switches. The control apparatus controls the switches, based on respective voltage values of the plurality of power storage apparatuses and respective resistance values of conductive paths of the plurality of power storage apparatuses. The control apparatus charges or discharges at least one of the plurality of power storage apparatuses.