Battery Pack Strain Gauge Layout for Expansion Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery pack technologies face challenges in accurately detecting battery expansion and other states, such as contraction, which can lead to issues like leakage due to reduced battery life.
Innovation Solution
A battery pack design incorporating a strain gauge with an insulating layer and a Cr composite film resistor, which detects changes in resistance values to monitor battery expansion and contraction, allowing for precise state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strain gauge is used to detect battery expansion, then detection capability is improved, but the sensor becomes susceptible to temperature changes affecting measurement accuracy
Solution Approach 1:
The patent introduces a temperature compensation resistor as an intermediary element that mediates the temperature effect. This resistor is positioned adjacent to the strain gauge resistor and has a temperature coefficient of resistance that compensates for the temperature-induced resistance changes in the strain gauge, thereby eliminating temperature influence on the expansion detection accuracy
Solution Approach 2:
The patent utilizes parameter changes by selecting specific temperature coefficients of resistance for the compensation resistor that match or counterbalance the temperature characteristics of the strain gauge resistor. By changing the resistance parameter of the compensation resistor in response to temperature variations, the system maintains accurate expansion detection across different temperature conditions
2Measurement precision
If multiple resistive portions are arranged in a grid pattern, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The sensor divides the detection area into multiple discrete resistive portions arranged in a grid pattern, with each portion independently detecting expansion in its local region. This segmentation allows comprehensive coverage of the battery surface while maintaining simple individual sensor elements that are easy to manufacture and analyze
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
The solution enables accurate detection of battery expansion and contraction, preventing damage by controlling charging and usage based on detected states, enhancing safety and reliability.
Implementation Method 1
a resistor formed of a Cr composite film on one side of the insulating layer, and detects the state of the battery as a change in a resistance value of the resistor
Data Source
AI summary
A battery pack includes a battery; and a sensor configured to detect a state of the battery. The sensor includes an insulating layer, and a resistor including a plurality of first resistive portions arranged side by side on one side of the insulating layer, a longitudinal direction of the plurality of first resistive portions being directed to a first direction, and the plurality of first resistive portions being not electrically coupled to each other, and a plurality of second resistive portions arranged side by side on another side of the insulating layer, a longitudinal direction of the plurality of second resistive portions being directed to a second direction intersecting with the first direction, and the plurality of second resistive portions being not electrically coupled to each other. The sensor detects the state of the battery as a change in a resistance value of the resistor.