Parallel Battery Module Switching for Voltage Mismatch
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Solution Overview
Problem
In electric storage systems with multiple modules connected in parallel, the voltage differential between modules can cause significant current flow, leading to deterioration or damage, especially with improved lithium-ion battery impedance, making module replacement challenging and time-consuming.
Innovation Solution
The electric storage system allows each module to switch its connection relationship with the system control unit, enabling modules to be replaced without precise voltage adjustment, by disconnecting before connection to prevent current flow during voltage mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric storage modules are connected in parallel with improved lithium-ion battery impedance, then power output capability is improved, but voltage differential causes significant current flow leading to deterioration or damage
Solution Approach 1:
The patent implements dynamic switching elements (transistors) that can change their state between conducting and non-conducting based on voltage differential conditions. These switching elements are controlled by control circuits that continuously monitor voltage differences between parallel-connected modules and adjust connectivity in real-time, allowing the system to adapt its configuration dynamically to prevent damage while maintaining power capability
Solution Approach 2:
The patent introduces switching elements as intermediary components between parallel-connected electric storage modules. These switching elements act as controlled mediators that can selectively connect or disconnect modules based on voltage differential conditions, preventing harmful current flow while allowing beneficial parallel operation for enhanced power output
2Reliability
If voltage adjustment is performed before module replacement, then current flow during voltage mismatch is prevented, but replacement process becomes time-consuming
Solution Approach 1:
The patent implements preliminary protective action by pre-configuring switching elements and control circuits that automatically detect voltage differentials and prevent harmful current flow before module replacement occurs. The control system is prepared in advance to monitor voltage conditions and activate protective switching without requiring manual voltage adjustment during the replacement process
Solution Approach 2:
The patent enables the system to self-regulate voltage differential issues through automatic control circuits that continuously monitor module voltages and independently activate switching elements to prevent harmful current flow. This self-service mechanism eliminates the need for manual voltage adjustment operations, allowing rapid module replacement while maintaining protection against voltage mismatch
3Adaptability or versatility
If modules with different battery characteristics are connected in parallel, then system adaptability is improved, but voltage differential causes significant current flow
Solution Approach 1:
The patent implements dynamic switching elements controlled by control circuits that continuously monitor voltage differentials between modules with different battery characteristics. The switching elements dynamically adjust their conductivity based on real-time voltage conditions, allowing the system to accommodate diverse battery types (different capacities, voltages, chemistries) while preventing harmful current flow through active control
Solution Approach 2:
The patent introduces switching elements as intermediary components between parallel-connected modules with different battery characteristics. These controlled intermediaries selectively enable or disable connections based on voltage differential conditions, allowing heterogeneous module configurations for enhanced adaptability while preventing harmful current flow through intelligent mediation
Data Source
AI summary
An electric storage system is provided including a switching unit which is arranged between an electric storage unit of an electric storage device which is configured to be connectable in parallel with another power supply device and wire which is configured to electrically connect the electric storage device and the another power supply device, wherein the switching unit is configured to switch the electrical connection relationship between the wire and the electric storage unit; and a restriction unit which is connected in parallel with the switching unit between the wire and the electric storage unit, has a higher resistance than the switching unit, and is configured to cause current to flow in a direction from the electric storage unit to the wire and suppress current flowing in a direction from the wire to the electric storage unit.