Control Device for Electric Storage Hot-Swap Current Management
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Solution Overview
Problem
In electric storage systems with hot-swapping and protection functions, the charging and discharging efficiency is compromised due to inefficiencies in managing current flow between electric storage modules connected in parallel.
Innovation Solution
A control device that includes an adjusting unit to manage current flow between electric storage units and a power supply device, featuring a current detecting unit and an operation control unit that adjusts current flow based on voltage, State of Charge (SOC), and terminal voltage to optimize connections and prevent damage during module replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electric storage modules are connected in parallel with hot-swap function and protection function, then module replacement flexibility is improved, but charging and discharging efficiency deteriorates due to current flow imbalances
Solution Approach 1:
A current adjusting unit is introduced as an intermediary component between the electric storage module and the power supply device. This unit actively regulates current flow, preventing imbalances that would otherwise occur during hot-swapping operations. The mediator enables both hot-swap flexibility and efficient charging/discharging by controlling the electrical interaction between modules.
2Productivity
If current adjusting unit is added to manage current flow, then charging and discharging efficiency is improved, but device complexity increases
Solution Approach 1:
Rather than implementing a complex system-wide current management solution, the patent applies current adjustment locally at each electric storage module connection point. The current adjusting unit is positioned specifically where current imbalances originate (at the module interface), allowing efficient current control without requiring complex modifications to the entire system architecture.
3Reliability
If precise voltage adjustments are required for module replacement, then module protection is improved, but operation time increases
Solution Approach 1:
The current adjusting unit is configured to automatically regulate current flow as soon as an electric storage module is connected during hot-swap operations. This preliminary current adjustment occurs immediately upon connection, eliminating the need for time-consuming manual voltage matching or sequential adjustment procedures. Module protection is thus achieved without extending replacement time.
Data Source
AI summary
The control device controls an adjusting unit that adjusts current flowing between an electric storage unit of an electric storage device configured such that the electric storage device can be connected in parallel with a distinct power supply device, and a wire that electrically connects the electric storage device and the distinct power supply device. The control device includes a current detecting unit that detects (i) current flowing between the wire and the electric storage unit in the second direction or (ii) current flowing between the wire and the electric storage unit when the first current adjusting unit electrically disconnects the wire and the electric storage unit, and an operation control unit that controls operation of the first current adjusting unit based on (i) voltage or SOC of the electric storage unit and (ii) a detection result of the current detecting unit.