Power Storage Deterioration Detection via Partial Voltage Integration
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Solution Overview
Problem
Conventional methods for estimating the deterioration of power storage devices, such as lithium ion batteries, require complete discharge, which is inconvenient and accelerates device deterioration.
Innovation Solution
A state output apparatus that calculates and compares the integrated current amount during a specific voltage change period in a power storage device, allowing for deterioration detection without complete discharge, using an integrated current amount calculator and comparer to output the device's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete discharge is performed to estimate power storage device deterioration, then measurement precision is improved, but device deterioration is accelerated and user convenience deteriorates
Solution Approach 1:
The patent applies partial action by performing integration calculation only over a specific voltage range (from integration start voltage to integration end voltage) rather than requiring complete discharge from full charge to empty. This allows deterioration estimation using only a portion of the discharge curve, reducing the harmful effect of complete discharge while maintaining sufficient measurement precision through the selected voltage range.
2Measurement precision
If complete discharge is performed to estimate power storage device deterioration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables deterioration estimation using only a partial discharge process within a specific voltage range, eliminating the need for users to perform complete discharge cycles. This significantly improves ease of operation and user convenience while maintaining adequate measurement precision for deterioration detection.
3Ease of operation
If integration calculation is performed over a specific voltage range instead of complete discharge, then ease of operation is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent changes the parameters of the measurement process by selecting specific integration start and end voltages that define an optimal voltage range for deterioration estimation. This parameter change allows the system to achieve both improved ease of operation (no complete discharge needed) and maintained measurement precision (through carefully selected voltage boundaries that capture characteristic discharge behavior).
Data Source
AI summary
A state output apparatus includes a power storage device information acquirer configured to acquire power storage device information including a voltage and a current of a power storage device; an integrated current amount calculator configured to calculate an integrated current amount supplied to the power storage device during a period in which the voltage changes from a first voltage to a second voltage between a discharge end voltage and a charge end voltage by charging the power storage device; an integrated current amount comparer configured to compare the calculated integrated current amount with a reference integrated current amount stored in a storage device; and a state outputter configured to output a result of the comparison as information indicating a state of the power storage device.