Electric Storage Module Switching for Safe Parallel Replacement
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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 energy storage capacity and power output are improved, but voltage differential between modules causes significant current flow leading to deterioration or damage
Solution Approach 1:
The system performs preliminary voltage equalization control before modules are fully connected in parallel. The control unit identifies modules with voltage differentials and adjusts their charging/discharging states in advance, preventing dangerous current flow from occurring when modules with significantly different voltages are connected, thus resolving the contradiction between maintaining high power output and ensuring module safety
Solution Approach 2:
The control unit continuously monitors the voltage of each electric storage module and uses this feedback information to dynamically adjust the connection state and operating parameters of individual modules. When voltage differential exceeds a threshold, the system modifies charging/discharging rates or temporarily isolates affected modules, preventing harmful current flow while maintaining overall system power output
2Reliability
If voltage adjustment is performed precisely before module replacement, then current flow during voltage mismatch is prevented, but replacement process becomes time-consuming and complex
Solution Approach 1:
The control unit automatically performs voltage equalization control and connection management without requiring manual intervention. The system self-monitors voltage differentials, self-adjusts module operating states, and self-manages the replacement process, eliminating the need for time-consuming manual voltage adjustment while ensuring current flow is prevented, thus resolving the contradiction between reliability and replacement speed
Solution Approach 2:
The system performs automatic voltage equalization in advance before module replacement is initiated. By proactively balancing voltages across all modules and preparing the system state beforehand, the control unit eliminates the need for time-consuming voltage adjustment during the replacement process itself, allowing modules to be swapped quickly while maintaining safety
3Productivity
If modules are replaced quickly without voltage adjustment, then replacement speed is improved, but risk of damage from current flow increases
Solution Approach 1:
The control unit continuously monitors voltage levels and automatically adjusts module connection states based on real-time feedback. When a module is being replaced, the system detects voltage differentials and dynamically controls the connection timing and state, allowing rapid replacement while preventing harmful current flow through automated voltage-based control decisions
Solution Approach 2:
The system performs preliminary voltage assessment and preparation before module replacement begins. By pre-evaluating voltage states and preparing appropriate control strategies in advance, the system enables modules to be replaced quickly while ensuring that voltage differential protection is already in place, thus achieving both high replacement speed and safety
Data Source
AI summary
A switching unit is included, which is arranged between a first electric storage unit of a first electric storage device configured to be connectable in parallel with a second electric storage device and a wire electrically connecting the first electric storage device and the second electric storage device, and which is configured to switch a electrical connection relationship of the wire and the first electric storage unit. A restricting unit is included, which is connected in parallel with the switching unit between the wire and the first electric storage unit, has a higher resistance than the switching unit, and is configured to cause a current to flow in the direction from the wire to the first electric storage unit and suppress current flowing in the direction from the first electric storage unit to the wire.