Bus Bar Module Drain Geometry for Condensation Discharge
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Solution Overview
Problem
Existing bus bar module cases and modules struggle with effectively managing and discharging water droplets accumulated in the bus bar cavity, leading to potential issues such as condensation and accumulation.
Innovation Solution
The bus bar module case and module incorporate a drain hole with a tapered guide portion in the side wall, reducing the cross-sectional area from the inside to the outside of the cavity, and a rib extending from the edge of the drain hole to facilitate smooth discharge of water droplets, preventing accumulation and ensuring they do not contact the battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a drain hole is provided in the side wall to discharge water droplets, then water droplet discharge capability is improved, but water droplets may accumulate on the outer surface of the side wall
Solution Approach 1:
The drain hole is designed with a tapered guide portion that has a curved surface. This curved surface guides water droplets along its contour from the inner surface to the outer surface of the side wall, preventing water droplets from accumulating on the outer surface while maintaining effective discharge capability.
2Productivity
If the drain hole has a large cross-sectional area, then water droplet discharge efficiency is improved, but structural strength of the side wall is reduced
Solution Approach 1:
The drain hole is designed with a tapered guide portion that gradually reduces cross-sectional area from the inner surface toward the outer surface of the side wall. This localized variation in cross-sectional area allows the drain hole to maintain sufficient discharge efficiency while preserving the structural strength of the side wall, as the majority of the side wall retains its full thickness and strength.
3Reliability
If the drain hole is positioned to facilitate water droplet discharge, then condensation management is improved, but risk of water droplet contact with battery cells increases
Solution Approach 1:
The tapered guide portion acts as an intermediary structure between the inner surface and outer surface of the side wall. It controls the flow path of water droplets, guiding them along its curved surface to a designated discharge position, thereby preventing water droplets from randomly contacting battery cells while maintaining effective condensation management.
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 discharges water droplets generated due to condensation, preventing accumulation and ensuring they do not come into contact with the battery cells, thus maintaining the integrity and performance of the battery pack.
Implementation Method 1
the drain hole has an edge portion including a tapered guide portion inclined to reduce a cross-sectional area of the drain hole from the inside to the outside of the bus bar cavity
Data Source
AI summary
A bus bar module case includes a bus bar cavity that accommodates therein a bus bar connecting electrodes of battery cells in a plurality of the battery cells arranged side by side and includes a side wall erected around an end edge of the bus bar, and the side wall is provided with a drain hole that communicates an inside and an outside of the bus bar cavity. In addition, a bus bar module includes the bus bar, a wiring member, and the bus bar module case. An edge portion of the drain hole includes tapered guide portions inclined so as to reduce a cross-sectional area of the drain hole from the inside to the outside of the bus bar cavity.