Electrical Storage Device Test Method Using Dynamic Voltage Transition
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Solution Overview
Problem
Existing test methods for electrical storage devices, such as those described in JP 2019-113450 A, face challenges in quickly determining the condition of the device due to instability in circuit current caused by parasitic resistance, leading to prolonged convergence times and sensitivity to disturbances like temperature changes.
Innovation Solution
A test method involving a first energization process with a higher voltage to facilitate circuit current convergence, followed by a second energization process with a decreased voltage, utilizing an imaginary resistance concept to set an effective resistance value below 0.1Ω, allowing for stable and accurate determination of the device's condition despite disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the parasitic resistance is reduced to converge circuit current earlier, then the convergence time is shortened, but the stability of circuit current deteriorates and it becomes sensitive to disturbances
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable and changeable during the measurement process. The system transitions from a first voltage state during initial convergence to a second voltage state during stable measurement, allowing the electrical storage device to adapt to different operational phases and maintain both fast convergence and high stability.
Solution Approach 2:
The patent changes the voltage parameter of the power supply based on the operational phase. By setting different voltage values (first voltage during convergence, second voltage during measurement), the system optimizes performance for each phase: fast convergence initially, then high stability during the actual measurement process.
2Reliability
If the parasitic resistance is made large to improve current stability, then the stability of circuit current improves, but the convergence of circuit current takes time
Solution Approach 1:
The system dynamically adjusts the power supply voltage to match the operational requirements. During the convergence phase, a higher first voltage accelerates current convergence. During the measurement phase, the voltage transitions to a second value that ensures stable current flow, eliminating the need to maintain high parasitic resistance throughout the entire process.
Solution Approach 2:
The patent performs preliminary action by first establishing circuit current convergence under optimized conditions (first voltage state) before transitioning to the measurement phase. This preliminary convergence phase prepares the system for stable measurement without requiring the entire process to accommodate the slower convergence rate.
3Speed
If the voltage of the external power supply is increased to reduce parasitic resistance effect, then the convergence speed improves, but the circuit current becomes more sensitive to disturbances
Solution Approach 1:
The patent implements dynamic voltage adjustment where the power supply operates at a first voltage during the convergence phase to achieve fast convergence, then transitions to a second voltage during the measurement phase to reduce sensitivity to disturbances. This dynamic adaptation resolves the contradiction between speed and reliability.
Solution Approach 2:
The measurement process is divided into distinct periodic phases: a first period for convergence under high voltage conditions, and a second period for stable measurement under optimized voltage conditions. This periodic structure allows the system to optimize for different objectives at different times.
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
This approach significantly shortens the processing time for determining the electrical storage device's condition while maintaining stability and accuracy, even in the presence of disturbances, by transitioning from a high-voltage first energization process to a lower-voltage second process with an intermediate effective resistance.
Implementation Method 1
a first energization process of applying a voltage with the power supply to cause a current for charging the electrical storage device to flow through the circuit
Implementation Method 2
a second energization process of, when a predetermined transition condition is satisfied while the first energization process is being performed, decreasing the voltage of the power supply to cause the current to further flow
Data Source
AI summary
By a first energization process of applying a voltage with the power supply to cause a current for charging the electrical storage device to flow through the circuit and a second energization process of, when a transition condition is satisfied during the first energization process, decreasing the voltage of the power supply to cause the current to further flow, a condition of an electrical storage is determined. An effective resistance value of the circuit is set to 0.1Ω or below. A decrease in the voltage of the power supply in transition from the first energization process to the second energization process is set such that the effective resistance value in the second energization process is an intermediate value between a parasitic resistance value of the circuit and the effective resistance value in the first energization process.