Battery Cell Optical Fiber Layout for Precise Temperature Sensing
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Solution Overview
Problem
Existing battery cell temperature measurement systems face challenges with low precision due to limited data points, susceptibility to electromagnetic interference, and difficulty in accurately determining the highest and lowest temperatures, especially with single arrangement forms and small data collection points.
Innovation Solution
Implementing grating temperature measurement points on an optical fiber arranged on the cell body, which allows for abundant data sampling and precise temperature measurement, unaffected by electromagnetic interference, with a small geometric size and flexible arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple thermistors are used for temperature measurement, then temperature data can be collected, but the data points are limited and arrangement is difficult
Solution Approach 1:
The optical fiber is segmented into multiple grating temperature measurement points along its length, allowing temperature measurement at multiple discrete locations. Each grating acts as an independent measurement point, enabling comprehensive temperature monitoring without requiring multiple separate sensor components
Solution Approach 2:
The patent replaces the mechanical/electrical thermistor-based temperature measurement system with an optical fiber grating system. This substitution eliminates the need for complex electrical connections and physical arrangement of multiple thermistors, while providing more measurement points along the fiber length
2Measurement precision
If thermistors are arranged at the end portion of the cell, then temperature measurement is possible, but it is difficult to collect the highest and lowest temperatures throughout the cell
Solution Approach 1:
The temperature measurement transitions from a single-point or limited-point measurement at the cell end to a distributed measurement along the entire length of the cell. The optical fiber extends along the cell body, providing measurement coverage across the full spatial dimension of the cell, enabling detection of temperature extremes at any location
3Measurement precision
If traditional temperature sensors are used, then temperature data can be collected, but the data is susceptible to electromagnetic interference resulting in data drift
Solution Approach 1:
The patent replaces electromagnetic-based temperature sensing (thermistors) with an optical-based sensing system. The optical fiber grating measurements are immune to electromagnetic interference since they rely on optical properties rather than electrical properties, eliminating data drift caused by EMI in electromagnetic environments
4Measurement precision
If more temperature measurement points are added, then temperature measurement precision improves, but the geometric size and arrangement difficulty increase
Solution Approach 1:
Multiple temperature measurement points are merged into a single optical fiber assembly. Instead of having separate physical sensors distributed throughout the cell, all measurement points are integrated along the length of one flexible optical fiber, reducing the overall sensor assembly volume while maintaining multiple measurement capabilities
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
Enhances temperature measurement accuracy and precision, facilitating effective temperature control by accurately determining the highest and lowest temperatures, while minimizing structural impact and electromagnetic interference.
Implementation Method 1
Multiple grating temperature measurement points are formed on the optical fiber
Implementation Method 2
the optical fiber is arranged on the cell body
Data Source
AI summary
A battery cell, a battery module, and a battery pack are provided. The battery cell includes a battery cell body and an optical fiber. A plurality of grating temperature measuring points are formed on the optical fiber. The optical fiber is arranged on the battery cell body.