Overcurrent Simulation for Nail Penetration Safety
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Solution Overview
Problem
Current methods lack an efficient way to simulate the direction and magnitude of overcurrent in lithium ion secondary batteries when a conductive object penetrates, which is crucial for safety but requires costly and time-consuming actual tests considering various factors.
Innovation Solution
An overcurrent simulation method using an electronic circuit analysis program operated by a microprocessor, which sets and varies the resistance values of safety device components to simulate the flow of overcurrent through equivalent circuits representing the battery and safety device, allowing for the calculation of optimal resistance values for minimal current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual penetration tests are conducted to determine overcurrent characteristics, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent creates an equivalent circuit that copies the electrical characteristics of the actual battery system. By modeling the battery, safety device, and penetration path as electrical components with specific parameters (resistance, capacitance, voltage sources), the system replicates real penetration scenarios without physical testing, achieving accurate overcurrent measurement while eliminating time-consuming actual tests
Solution Approach 2:
The patent replaces the mechanical/physical penetration test system with an electrical simulation system. Instead of physically penetrating batteries with nails and measuring actual current flow, the invention uses an electronic circuit analysis program to calculate overcurrent characteristics based on electrical equivalent circuits, substituting physical experimentation with computational analysis
2Measurement precision
If actual penetration tests are conducted to determine overcurrent characteristics, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The equivalent circuit model copies the essential electrical behavior of the battery system, allowing multiple simulation scenarios to be evaluated computationally. This enables rapid assessment of different penetration paths, safety device configurations, and battery arrangements without repeating physical tests, significantly improving safety evaluation productivity while maintaining measurement accuracy
Solution Approach 2:
The patent performs preliminary modeling of the battery system's electrical characteristics before conducting safety evaluations. By pre-establishing the equivalent circuit parameters (internal resistance, capacitance, voltage sources) and safety device characteristics, the system prepares all necessary data structures and models in advance, enabling rapid subsequent analysis without time-consuming setup for each test case
3Reliability
If resistance values of safety device components are varied to find optimal values, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent systematically varies key parameters of the safety device (resistance values of first and second metal sheets) within the equivalent circuit model to identify optimal configurations. By changing these electrical parameters in the simulation and observing their effect on overcurrent characteristics, the invention determines the resistance values that minimize dangerous current flow, improving reliability through parameter optimization rather than physical trial-and-error
Solution Approach 2:
The patent replaces complex physical prototyping and testing of different safety device configurations with computational parameter variation. Instead of manufacturing and testing multiple physical safety devices with different resistance values, the invention uses the electronic circuit analysis program to evaluate numerous parameter combinations virtually, reducing device complexity while achieving reliable safety performance through systematic parameter optimization
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 accurate simulation of overcurrent direction and magnitude without actual penetration tests, reducing costs and time while considering multiple factors, and allows for the calculation of resistance values that minimize current flow.
Implementation Method 1
the overcurrent simulation method includes (a) receiving, by the microprocessor, an input of a safety device including a first metal sheet, an insulator member and a second metal sheet
Implementation Method 2
simulates a direction and an amount of an overcurrent based on a resistance value of a safety device
Data Source
AI summary
Disclosed is an overcurrent simulation method when a nail penetrates a secondary battery and a recording medium storing the program. The overcurrent simulation method according to the present disclosure constructs a safety device and a secondary battery equivalent circuit, and produces a nail penetration effect by changing a resistance value. In this instance, various current simulations may be obtained by changing a first metal sheet and a second metal sheet included in the safety device, and a resistance value limiting an overcurrent may be calculated.