Secondary Battery Insulation Inspection Using Charge Amount Optimization
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Solution Overview
Problem
Existing insulation inspection methods for secondary batteries are time-consuming due to the slow convergence of power supply current, leading to prolonged inspection times.
Innovation Solution
Selecting an initial charge amount for the inspection where the inclination of the charge amount-battery voltage curve is two or more times the minimum inclination, reducing local battery capacitance and thereby shortening the convergence time of the power supply current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the initial charge amount is set to the minimum-inclination charge amount, then the local battery capacitance is maximized, but the convergence time of power-supply current becomes excessively long
Solution Approach 1:
The patent changes the parameter of initial charge amount from the conventional minimum-inclination charge amount to a charge amount in the range where the inclination is two or more times the minimum inclination. This parameter change reduces the local battery capacitance to 1/2 or less, thereby shortening the convergence time of power-supply current and reducing inspection time while maintaining inspection accuracy through proper selection of charge amount range.
2Loss of time
If the initial charge amount is increased to reduce local battery capacitance, then the convergence time shortens, but the power-supply current becomes excessively large
Solution Approach 1:
The patent optimizes the charge amount parameter to a specific range where the inclination is two or more times the minimum inclination, rather than simply increasing the charge amount. This optimized parameter selection achieves the dual benefit of reducing local battery capacitance (shortening convergence time) while keeping the power-supply current within acceptable limits.
3Productivity
If the initial charge amount is set to achieve fast convergence, then the inspection time is reduced, but the sensitivity to temperature variations increases
Solution Approach 1:
The patent selects the initial charge amount from a specific range (where inclination is two or more times the minimum inclination) that balances multiple objectives. This parameter optimization achieves fast convergence (reducing inspection time) while simultaneously minimizing the variation of power-supply current with temperature changes, thereby reducing temperature sensitivity.
Data Source
AI summary
In a method for inspecting the insulation property of a secondary battery by connecting an external DC power supply to the secondary battery charged with an initial charge amount and evaluating the insulation property of the secondary battery based on a converging state of a power-supply current, when a charge amount at which an inclination of a tangent to a charge amount—battery voltage curve representing a relationship between the charge amount and a battery voltage of the secondary battery is smallest is assumed as a minimum-inclination charge amount, and the inclination of the tangent at the minimum-inclination charge amount is assumed as a minimum inclination (αL), the initial charge amount is selected from a range of the charge amount in which the inclination is two or more times the minimum inclination.