Battery Box Separator Flow Layout for Uniform Cell Cooling
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Solution Overview
Problem
Existing battery packs experience uneven heat exchange due to coolant distribution, leading to premature aging and reduced capacity of certain cells, which affects the service life of the battery pack.
Innovation Solution
A separator and tray design that guides coolant flow to uniformly immerse all cells in a battery box, ensuring uniform heat exchange and prolonged cell life by using flow guiding assemblies and cavities to manage coolant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coolant is introduced from one liquid inlet and flows to one liquid outlet, then the structure is simple, but the heat exchange effect is uneven causing premature cell aging
Solution Approach 1:
The battery box is divided into multiple cavities (first cavity, second cavity, third cavity) separated by partition walls. The coolant flow path is segmented into multiple sections, with each cavity containing battery modules that are independently cooled. This segmentation ensures uniform heat exchange across all cells while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the battery box are provided with different coolant flow characteristics. The first cavity receives coolant from the first liquid inlet, the second cavity receives coolant from the second liquid inlet, and the third cavity receives coolant from the first liquid outlet. This local differentiation ensures that each region receives appropriately cooled coolant, improving overall heat exchange uniformity.
2Speed
If coolant flows directly from liquid inlet to liquid outlet, then the flow path is short, but cells away from the inlet cannot contact low-temperature coolant effectively
Solution Approach 1:
The coolant flow path is divided into multiple segments through separate cavities. Coolant enters the first cavity from the first liquid inlet, flows through to the third cavity, then enters the second cavity from the second liquid inlet, and finally exits through the second liquid outlet. This segmented path ensures that coolant maintains lower temperatures for longer periods, allowing cells away from the inlet to also contact low-temperature coolant effectively.
Solution Approach 2:
The coolant flow is extended from a simple linear path to a multi-dimensional path that traverses through multiple cavities in sequence. This dimensional expansion of the flow path increases the contact time and coverage area of the coolant with battery modules, ensuring uniform temperature distribution throughout the battery pack.
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 enhances uniform heat dissipation across all cells, prolonging the service life of the battery pack by improving heat exchange efficiency and reducing temperature differences among cells.
Implementation Method 1
a coolant is directly sent into the battery box to contact a cell housing for heat exchange
Implementation Method 2
The coolant is introduced into the liquid inlet. After the cells are immersed in the coolant, the coolant flows out from the liquid outlet
Data Source
AI summary
Provided are a separator, a battery box, and a battery pack. The separator is applied to the battery box and includes a first body and a first flow guiding assembly. The first body is provided with a return hole and multiple mounting holes passing through the first body in a first direction. The multiple mounting holes are located between the liquid outlet region and the return hole. The first flow guiding assembly and the liquid outlet region are located on the same side surface of the first body. The first flow guiding assembly includes multiple first flow guiding grooves. The first flow guiding assembly is configured to guide a coolant in the region in which the battery module is located to the liquid outlet region.