Abnormality Detection Circuit for Power Storage Device
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Solution Overview
Problem
Existing abnormality detection circuits for power storage units, such as those in uninterruptable power supply devices, face challenges in accurately detecting rises in cell resistance or ground faults due to their complex configurations and limited precision.
Innovation Solution
A simple abnormality detection circuit that includes a voltage detection circuit and a control circuit, which monitors the electrical potential at an intermediate node between cells in a power storage module, determining abnormalities based on deviations from a predetermined reference range, and triggers a breaking signal to disconnect the faulty module to prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional abnormality detection circuits are used, then ground fault detection capability is provided, but the circuit configuration becomes complex and measurement precision is limited
Solution Approach 1:
The invention extracts the essential detection function by monitoring only the intermediate node voltage between cells, separating this critical measurement from the complex ground fault detection circuitry. By focusing on voltage changes at the intermediate node rather than implementing comprehensive ground current detection, the patent achieves reliable abnormality detection with significantly simplified circuit configuration.
2Measurement precision
If multiple detection methods are implemented to improve detection accuracy, then measurement precision increases, but the device complexity increases
Solution Approach 1:
The invention uses the intermediate node voltage as an intermediary parameter to detect both cell resistance changes and ground faults. Instead of implementing multiple independent detection methods, the patent monitors voltage changes at the intermediate node, which serves as a mediator that reflects the state of the power storage module. This single measurement point provides sufficient information to detect various abnormalities without requiring multiple complex detection circuits.
Data Source
AI summary
An abnormality detection circuit detects an abnormality in a power storage device. A positive electrode terminal and a negative electrode terminal respectively receive a positive electrical potential and a negative electrical potential from a converter. A power storage module includes plural cells connected in series between the positive electrode terminal and the negative electrode terminal. The abnormality detection circuit includes a voltage detection circuit and a control circuit. The voltage detection circuit detects an electrical potential of an intermediate node located at an intermediate position between the positive electrode terminal and the negative electrode terminal on a basis of a ground potential. The control circuit determines an abnormality of the power storage module based on a change in an intermediate ground potential from voltage detection circuit from the ground potential.