Electricity Storage Device Voltage Detection Circuit
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Solution Overview
Problem
In electricity storage systems where startup is performed using an external voltage, there is a concern that the devices cannot be shut down at a desired timing due to voltage interference from other connected devices, leading to potential overdischarging issues.
Innovation Solution
The system employs an external power source startup unit that detects the presence of a prescribed voltage and outputs a control signal only when the voltage is detected, allowing for safe shutdown of individual electricity storage devices even when connected in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If startup is performed by detecting the presence of external voltage, then the electricity storage device can be started up when battery voltage is low, but the device cannot be shut down at desired timing due to voltage from other connected devices
Solution Approach 1:
The patent divides the startup detection function into two independent detection mechanisms: one that detects external voltage presence for startup initiation, and another that detects battery voltage level for shutdown control. This segmentation allows each detection function to operate independently without interference from other connected devices' voltage.
Solution Approach 2:
The patent introduces an intermediary control mechanism that mediates between the external voltage detection and the shutdown decision. The control device uses the detected battery voltage level as an intermediary parameter to determine shutdown timing, rather than directly responding to external voltage presence, thus preventing unwanted shutdown interference from parallel-connected devices.
2Quantity of substance
If multiple electricity storage devices are connected in parallel, then system capacity is increased, but voltage interference prevents individual device shutdown control
Solution Approach 1:
The patent segments the voltage detection function into device-specific detection circuits that measure only the battery voltage of their own device, rather than detecting the combined voltage of all parallel-connected devices. This allows each device to independently monitor its own state and control its shutdown timing without being affected by other devices in the parallel configuration.
Solution Approach 2:
The patent implements local quality by having each electricity storage device use its own battery voltage level as the basis for shutdown control decisions, rather than responding to the global external voltage present in the parallel system. This local measurement approach ensures that each device can be independently controlled despite being connected in parallel with others.
Data Source
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AI summary
A first power source line disposed between a positive electrode side of an electricity storage unit and a first external terminal, a second power source line disposed between a negative electrode side of the electricity storage unit and a second external terminal, a power source circuit connected to both the first and second power source lines and configured to supply an output voltage to a control circuit in an operating state, a power source control circuit configured to control an operating state and a non-operating state of the power source circuit, a first control signal generation circuit configured to supply a first control signal corresponding to transition of an external voltage applied to the first external terminal and the second external terminal to the power source control circuit to set the power source circuit in an operating state for a prescribed time, and a second control signal generation circuit configured to generate a second control signal that allows the power source circuit to be set in an operating state continuously by the control circuit to which an output voltage of the power source circuit is supplied are included.