Secondary Battery Gas Generation Detection via Voltage Profiles
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Solution Overview
Problem
Secondary batteries face safety issues due to rapid gas generation during overcharging, which is difficult to measure accurately, especially in medium-large cell modules, leading to potential ignition or explosion and structural deformation challenges.
Innovation Solution
A method involving the measurement of closed circuit voltage (CCV) and open circuit voltage (OCV) profiles during charging to determine the section where gas generation accelerates, allowing for identification of rapid gas generation without direct gas analysis, using small cells to simulate medium-large cell conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct gas analysis is performed to measure gas generation in secondary batteries, then measurement precision is improved, but device complexity and manufacturing cost increase due to requiring specialized gas analysis devices
Solution Approach 1:
The patent uses voltage (CCV and OCV) as an intermediary parameter to indirectly measure gas generation. Instead of directly analyzing gas, the method measures voltage changes during charging, which correlate with gas generation acceleration. This intermediary approach eliminates the need for complex gas analysis devices while maintaining measurement capability.
Solution Approach 2:
The patent replaces the mechanical/chemical gas analysis system with an electrical measurement system. By substituting direct gas detection with voltage measurement and profile analysis, the method simplifies the testing equipment while enabling remote and continuous monitoring of gas generation through electrical parameters.
2Reliability
If medium-large cell modules are tested for safety, then comprehensive safety evaluation is improved, but measurement difficulty increases due to structural deformation and chain reaction risks
Solution Approach 1:
The patent performs preliminary measurements of CCV and OCV throughout the charging process to establish baseline profiles before gas generation acceleration occurs. By continuously monitoring voltage during charging and comparing against established profiles, the method can predict and identify gas generation acceleration points before they cause structural deformation or chain reactions in medium-large cell modules.
Solution Approach 2:
The patent implements a feedback mechanism by continuously monitoring voltage changes during charging and comparing real-time measurements against reference profiles. When voltage deviation exceeds a threshold, the system identifies gas generation acceleration and can adjust charging parameters or trigger safety protocols, enabling real-time safety management in medium-large cell modules.
Data Source
AI summary
The present invention relates to a method for determining a section in which generation of internal gas in a second battery accelerates, the method comprising the steps of: measuring a closed circuit voltage (CCV) and an open circuit voltage (OCV) according to the state of charge (SOC) of the secondary battery while charging the secondary battery; deriving a closed circuit voltage (SOC-CCV) profile according to the state of charge and an open circuit voltage (SOC-OCV) profile according to the state of charge; and determining, from the derived SOC-CCV profile and SOC-OCV profile, a section in which the amount of internal gas generated in the secondary battery rapidly increases.