Battery Pack Thermal Diffusing Plate with Localized Insulation
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Solution Overview
Problem
Existing battery packs for electric vehicles face challenges in maintaining uniform temperature among cylindrical batteries due to external thermal influences, leading to uneven charge-discharge behavior and battery deterioration, with existing solutions either failing to effectively suppress temperature variations or increasing the pack's dimensions.
Innovation Solution
A battery pack design incorporating a thermal diffusing plate with a heat transfer coefficient optimized for cylindrical batteries, surrounded by a casing with varying thickness heat insulating layers and a cooling air duct, which reduces temperature variations while minimizing the pack's dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thermal insulating layer is provided only to one surface of the battery pack, then the structure is simple, but external thermal influence causes temperature variation in the thermal diffusing plate and among batteries
Solution Approach 1:
The patent applies local quality by providing different thicknesses of thermal insulating layers at different locations of the battery pack. Specifically, the first thermal insulating layer is provided at the first outer surface with a first thickness, while second thermal insulating layers are provided at other outer surfaces with second thicknesses that are different from the first thickness. This non-uniform insulation strategy is designed based on the specific thermal influence characteristics of each surface, optimizing temperature uniformity without excessive complexity.
2Temperature
If a thick thermal insulating layer is disposed around the entire circumference of the battery pack, then external thermal influence is suppressed, but the dimension of the battery pack increases
Solution Approach 1:
The patent implements local quality by varying the thickness of thermal insulating layers at different surfaces of the battery pack. The first thermal insulating layer at the first outer surface has a first thickness, while second thermal insulating layers at other outer surfaces have second thicknesses that are less than the first thickness. This localized insulation approach provides effective thermal protection where needed while minimizing the overall dimension increase of the battery pack.
3Temperature
If the thermal diffusing plate is used to facilitate heat transmission, then temperature difference among batteries is reduced, but external thermal influence causes temperature variation in the plate
Solution Approach 1:
The patent applies local quality by providing thermal insulating layers at specific outer surfaces of the battery pack, with different thicknesses optimized for each surface's thermal exposure. The first thermal insulating layer is provided at the first outer surface that is most affected by external thermal influence, while second thermal insulating layers are provided at other surfaces with appropriate thicknesses. This localized insulation protects the thermal diffusing plate from external thermal influences while maintaining its heat transmission function for temperature uniformity among batteries.
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 design effectively suppresses temperature variations among batteries, maintaining uniformity and preventing dimension increases, while ensuring efficient heat transfer and cooling, thus enhancing battery performance and longevity.
Implementation Method 1
The thermal diffusing plate is configured to transfer heat between the thermal diffusing plate and a cylindrical surface of each of the plurality of cylindrical batteries
Implementation Method 2
A heat transfer coefficient between the first outer surface and an outside air of the casing is lower than a heat transfer coefficient between each of the outer surfaces other than the first outer surface and the outside air of the casing
Data Source
AI summary
A battery pack includes cylindrical batteries, a thermal diffusing plate, and a casing. The thermal diffusing plate holds the cylindrical batteries. The casing houses the cylindrical batteries and the thermal diffusing plate. The casing includes a first inner surface, inner surfaces other than the first inner surface, a first outer surface, and outer surfaces other than the first outer surface. The first inner surface is located between the first outer surface and the thermal diffusing plate. The heat transfer coefficient between the first outer surface and an outside air of the casing is lower than the heat transfer coefficient between each of the outer surfaces other than the first outer surface and the outside air of the casing.