Pouch Secondary Battery Thermal Sensing With PTC-NTC Shutdown
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Solution Overview
Problem
Pouch type secondary batteries lack a mechanism to interrupt current when the temperature abnormally increases, posing a safety risk.
Innovation Solution
Incorporating a plurality of temperature sensing parts with both positive temperature coefficient (PTC) and negative temperature coefficient (NTC) elements adjacent to the battery exterior, connected via a circuit, to sense and manage temperature thresholds, with a controller to interrupt current or send warnings when predetermined temperatures are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pouch type secondary battery structure is used, then manufacturing cost is reduced and process is simplified, but safety is compromised due to lack of current interruption mechanism
Solution Approach 1:
The temperature sensing function is segmented into multiple independent sensing parts distributed at different locations within the battery. Each sensing part can independently detect temperature at its location and trigger current interruption when necessary, providing distributed safety monitoring without complicating the overall pouch structure
Solution Approach 2:
Temperature sensing parts act as intermediary elements between the battery interior and the current interruption mechanism. These sensors detect temperature changes and trigger the PTC element to interrupt current flow, providing a safety mechanism that doesn't require complex structural modifications to the pouch battery
2Reliability
If temperature sensing parts are added to detect abnormal temperature, then safety is improved, but device complexity increases
Solution Approach 1:
The temperature sensing parts are integrated with the electrode assembly structure, merging the sensing function into the existing battery components rather than adding separate external systems. This reduces overall device complexity while maintaining safety functionality
Solution Approach 2:
The PTC element provides automatic current interruption based on temperature detection without requiring external control systems. The system is self-regulating, where the temperature-sensitive materials automatically respond to abnormal conditions, eliminating the need for complex control circuitry
3Measurement precision
If multiple temperature sensing parts are provided to sense temperature of multiple areas, then temperature detection reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The battery is divided into multiple monitoring zones with temperature sensing parts strategically placed in each zone. This segmentation allows comprehensive temperature monitoring throughout the battery volume without requiring a continuous complex sensing network, as each sensing part covers a specific critical area
Solution Approach 2:
Temperature sensing parts are placed at specific locations where temperature abnormalities are most likely to occur, such as near electrode assemblies and current collectors. This localized approach provides high measurement precision where needed without the complexity of uniform distributed sensing throughout the entire battery
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
Effectively interrupts current to enhance safety by reliably detecting and responding to abnormal temperature increases, improving temperature information reliability and control.
Implementation Method 1
at least one of the plurality of temperature sensing parts includes: a positive temperature coefficient (PTC) element
Implementation Method 2
a negative temperature coefficient (NTC) element
Data Source
AI summary
A secondary battery includes: an electrode assembly; a sheet-type exterior configured to accommodate the electrode assembly; and a plurality of temperature sensing parts provided adjacent to the exterior to sense a temperature of a plurality of areas, respectively, of the exterior, wherein at least one of the plurality of temperature sensing parts includes: a positive temperature coefficient (PTC) element; and a negative temperature coefficient (NTC) element.