Battery State Measurement Using Constant-Current Voltage Change
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Solution Overview
Problem
Existing methods for determining the state of power storage devices, such as secondary batteries, require several days to several weeks to estimate their condition by measuring voltage changes due to self-discharge, making the process time-consuming.
Innovation Solution
A measurement apparatus and method that supplies constant current to the power storage device, measures voltage changes, and computes the internal state using a controller to rapidly assess the device's condition by enhancing voltage changes, allowing for quicker pass/fail determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power storage device is stored for several days to several weeks to measure voltage changes due to self-discharge, then the pass/fail determination can be made based on voltage lowering, but the time required to estimate the state of the power storage device becomes excessively long
Solution Approach 1:
The invention changes the measurement parameters by applying a constant current load to the power storage device during a short period instead of waiting for natural self-discharge over several days. By measuring voltage changes under controlled current application, the system achieves rapid state estimation without requiring long storage periods, thus resolving the contradiction between measurement precision and time consumption
Solution Approach 2:
The invention performs preliminary action by applying a constant current to the power storage device before the actual measurement process. This pre-charging or pre-discharging step creates a known initial state that enhances the voltage change signal, allowing for more accurate and faster state estimation without requiring extended waiting periods
2Loss of time
If constant current is supplied to the power storage device to enhance voltage change, then the voltage change is enhanced and state estimation can be performed quickly, but additional current supply equipment and control mechanisms are required
Solution Approach 1:
The measurement apparatus is designed with multi-functionality where the constant current supply unit can serve multiple purposes: it acts as both a measurement excitation source and a potential charging/discharging device. This universal design reduces the need for separate dedicated equipment, thereby minimizing device complexity while enabling rapid state estimation through controlled current application
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the rapid estimation of power storage device state within a short time, reducing the need for prolonged waiting periods and improving the efficiency of state assessment compared to traditional methods.
Implementation Method 1
constant current supply means configured to supply the constant current to the power storage device
Implementation Method 2
voltage measuring means configured to measure the voltage of the power storage device
Data Source
AI summary
A measurement apparatus of a power storage device supplies constant current to the power storage device, measures voltage of the power storage device, and computes an internal state of the power storage device on the basis of voltage change in the power storage device subjected to the measurement.