Battery Sidewall Temperature Inspection for Cooling Consistency
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges in maintaining temperature consistency and efficiency, particularly at low temperatures, leading to rapid aging and performance issues.
Innovation Solution
A battery design that ensures a specific temperature difference relationship between positions on the battery's side wall, combined with a liquid cooling system, to enhance heat transfer and maintain temperature consistency, and a quality inspection method that evaluates this temperature difference to ensure battery quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional quality inspection methods are used for battery temperature testing, then the inspection process becomes complex and time-consuming, but the temperature consistency and quality control accuracy deteriorate
Solution Approach 1:
The patent transforms the quality inspection from complex multi-point internal temperature measurements to a simple surface temperature difference measurement. By changing the measurement parameter from internal temperature distribution to surface temperature differential (ΔT), the inspection method achieves both high efficiency and accurate quality assessment without requiring complex testing equipment or procedures
Solution Approach 2:
The patent replaces complex mechanical temperature measurement systems with a simplified thermal field analysis method. Instead of using multiple temperature sensors inside the battery, the invention uses surface temperature differential measurement combined with mathematical modeling to infer internal temperature consistency, significantly simplifying the inspection system while maintaining or improving measurement accuracy
2Reliability
If complex quality inspection procedures are implemented to ensure battery quality, then measurement accuracy improves, but manufacturing costs and process complexity increase
Solution Approach 1:
The patent changes the inspection parameter from complex internal temperature field characterization to simple surface temperature differential measurement. This parameter transformation maintains reliable quality assessment by focusing on the most critical quality indicator (temperature consistency) while eliminating unnecessary measurement complexity
Solution Approach 2:
The patent extracts the essential quality indicator (surface temperature differential) from the complex internal temperature field and uses it as the sole measurement parameter. By taking out only the most relevant quality attribute, the inspection process becomes simple while still ensuring battery quality reliability
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 battery design maintains good temperature consistency, preventing rapid aging and ensuring stable performance, while the quality inspection method simplifies and improves the accuracy of battery quality control, reducing costs and improving yield.
Implementation Method 1
combined with a liquid cooling system, to enhance heat transfer and maintain temperature consistency
Data Source
AI summary
A battery includes a battery body having a body top surface, a body bottom surface, and a body side wall. The body side wall includes two oppositely disposed first side walls. Distance between outer surfaces of the two first side walls is L. First and second positions not coincide with each other are taken on midline of any first side wall, the first position is located in a range of 0 to 10 mm from the body top surface, the second position is located in a range of 0 to 10 mm from the body bottom surface, and distance between the first and second positions is H. Under conditions of ambient temperature being 25° C. and 2C current rate, temperature at first position is T1, temperature at second position is T2, and the battery satisfies (T1−T2)×3L/H≤20° C.