Battery Cell Surface Temperature Estimation for Sensor Delay Compensation
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Solution Overview
Problem
Existing temperature measurement methods for battery cells are delayed due to limitations in physical contact and conduction/convection, leading to delayed safety diagnosis and reduced battery lifespan.
Innovation Solution
A software algorithm estimates actual cell surface temperature by calculating delay times based on temperature gradients and previous measurements, using a database to predict the current temperature accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is used to measure battery cell surface temperature through physical contact, then temperature measurement is achieved, but measurement delay occurs due to conduction and convection time differences
Solution Approach 1:
The system performs preliminary action by measuring the temperature gradient before the actual temperature change occurs. The gradient measurement unit detects temperature differences at multiple points around the battery cell, and the prediction unit uses these gradient data to calculate and predict the actual surface temperature in advance, compensating for the inherent delay in direct contact measurement.
Solution Approach 2:
The patent introduces temperature gradient measurement as an intermediary method. Instead of directly measuring the surface temperature with a contact sensor (which causes delay), the system measures the temperature gradient in the surrounding area as an intermediate parameter, then uses this gradient information to infer the actual surface temperature, thereby eliminating the measurement delay.
2Reliability
If temperature measurement delay occurs during overdischarge, then safety diagnosis is delayed, but the physical contact measurement method cannot be improved without additional hardware
Solution Approach 1:
The system implements feedback by continuously monitoring the temperature gradient and comparing it with predicted values. The prediction unit uses the measured gradient to calculate expected temperature changes, and this feedback loop allows the system to continuously update and refine the surface temperature prediction, ensuring reliable safety diagnosis without time delay.
Solution Approach 2:
The patent replaces the mechanical contact-based temperature measurement system with a computational approach. Instead of relying on physical thermal conduction through a contact sensor, the system uses mathematical models and gradient calculations to determine surface temperature, substituting mechanical measurement with computational prediction to eliminate measurement delay.
3Area of stationary object
If multiple temperature sensors are placed on the battery cell surface, then measurement coverage is improved, but device complexity and cost increase
Solution Approach 1:
The system applies segmentation by dividing the temperature measurement function into two parts: gradient measurement at multiple points and computational synthesis. Instead of placing multiple full temperature sensors, the system uses simpler gradient measurement units at strategic points, then combines these segmented measurements computationally to achieve complete surface temperature coverage.
Solution Approach 2:
The temperature gradient measurement unit serves multiple functions simultaneously: it measures local temperature differences, provides data for surface temperature prediction, and enables safety monitoring. This multi-functional approach eliminates the need for separate sensors for different measurement purposes, reducing overall system complexity while maintaining comprehensive coverage.
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
Minimizes temperature measurement delay, enabling real-time monitoring and improved battery stability through accurate temperature prediction.
Implementation Method 1
it is measured slower than the actual cell surface temperature when the temperature sensor does not come into close contact with the battery cell due to the limitations of physical device design such as process, or due to time difference due to conduction or convection
Implementation Method 2
it is measured slower than the actual cell surface temperature when the temperature sensor does not come into close contact with the battery cell due to the limitations of physical device design such as process, or due to time difference due to conduction or convection
Data Source
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AI summary
The present invention relates to a battery cell surface temperature estimation system and method, and more particularly, to a battery cell surface temperature estimation system and method capable of minimizing a temperature measurement delay through a software algorithm method that estimates the current actual cell surface temperature by reflecting the gradient of the measured temperature change of the battery cell.