Battery Cell Inner Temperature Measurement via Electrode Resistance
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Solution Overview
Problem
Conventional lithium secondary batteries face explosions due to overheating, which existing temperature measurement methods fail to detect in real time, leading to safety issues and increased manufacturing costs, especially when applied to various battery types.
Innovation Solution
Incorporating a resistance measurement terminal on the cathode or anode to measure resistance changes, allowing for real-time temperature monitoring without additional sensors, thus enabling proactive protection against overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate temperature sensor is attached to the battery surface to measure temperature, then temperature measurement capability is provided, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the temperature measurement function with the existing electrode structure by using the electrode itself as the sensing element. The resistance measurement terminal is integrated into the electrode assembly during manufacturing, eliminating the need for separate temperature sensors and reducing manufacturing complexity while maintaining temperature measurement capability
Solution Approach 2:
The electrode structure serves dual purposes: it functions as both the active electrochemical component and the temperature sensing element. By measuring the resistance of the electrode, which changes with temperature, the system achieves multi-functionality without adding separate components
2Measurement precision
If a separate temperature sensor is attached to the battery surface, then temperature measurement is enabled, but production cost increases
Solution Approach 1:
The temperature measurement function is merged into the electrode manufacturing process. The resistance measurement terminal is formed as part of the electrode assembly using existing materials and processes, eliminating the need for separate sensor components and reducing production costs
Solution Approach 2:
The electrode serves itself as the temperature sensor by utilizing its inherent electrical resistance property that changes with temperature. This self-service approach eliminates the need for external sensing components and reduces overall system cost
3Ease of operation
If surface temperature measurement is used, then simple measurement is achieved, but real-time inner temperature detection is insufficient leading to safety issues
Solution Approach 1:
The resistance measurement terminal is positioned to detect temperature changes in the electrode before they propagate to the battery surface. By measuring electrode resistance continuously, the system detects inner temperature changes in real-time, enabling early warning and preventive action before thermal runaway occurs
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 solution allows for accurate, real-time temperature measurement, reducing the risk of explosions and improving safety while simplifying manufacturing and reducing costs, making it applicable to various secondary battery types.
Implementation Method 1
a resistance measurement terminal provided in a battery cell to measure resistance of an electrode current collector
Data Source
AI summary
Disclosed is a battery cell having an electrode assembly configured as a structure in which a cathode, an anode, and a separator interposed between the cathode and the anode, wherein a surface or both surfaces of respective electrode current collectors of the cathode and the anode are coated with an electrode mixture including an electrode active material, the cathode and the anode are provided with a first cathode terminal and a first anode terminal respectively serving as external input/output terminals of the battery cell, and at least one of the cathode and the anode is provided with a resistance measurement terminal at a position opposite to the external input/output terminal, for measuring a resistance of an electrode current collector.