Battery Pack Bus Bar Segmentation for Vibration Reduction
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Solution Overview
Problem
Conventional battery packs face challenges in reducing the length of bus bars in the transverse direction, leading to increased vibration, impact, and reduced design flexibility due to long bus bar lengths when bus bars are drawn out for both polarities of battery assemblies.
Innovation Solution
The battery pack design includes a first and second battery assembly with electrode terminals, where bus bars are joined to specific electrode terminals of battery cells in each assembly, reducing the overall length of bus bars and improving insulation distances, thereby enhancing design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bus bars are drawn out from one side for both polarities of battery assemblies, then collective terminals are provided, but the bus bar length increases causing increased vibration and impact
Solution Approach 1:
The bus bar connection is segmented into multiple connection points along the battery assembly rather than being concentrated at one side. This distributes the bus bar length reduction across multiple connection locations, maintaining collective terminal functionality while reducing overall bus bar length and associated vibration and impact.
2Ease of operation
If bus bars are drawn out from one side for both polarities, then collective terminals are achieved, but insulation distance for other components becomes difficult to secure
Solution Approach 1:
The bus bar connections are distributed along the length of the battery assembly in the stacking direction, utilizing the longitudinal dimension to space out connections. This dimensional distribution allows adequate insulation distances to be maintained for other components while still providing collective terminal functionality through multiple connection points.
3Ease of operation
If bus bars are drawn out from one side, then collective terminals are provided, but degree of freedom in designing the battery pack is reduced
Solution Approach 1:
By segmenting the bus bar connections into multiple points distributed along the battery assembly, the design gains flexibility in positioning connections to accommodate different component layouts and packaging requirements, thereby increasing design freedom while maintaining collective terminal functionality.
Data Source
AI summary
A battery pack includes: a first battery assembly including a plurality of first battery cells arranged in a first direction; and a second battery assembly including a plurality of second battery cells arranged in the first direction, the second battery assembly being arranged beside the first battery assembly along a second direction orthogonal to the first direction. Each of the plurality of first battery cells and the plurality of second battery cells includes an electrode terminal. The battery pack further includes a bus bar joined to an electrode terminal of a first battery cell located at a certain portion of the first battery assembly in the first direction and an electrode terminal of a second battery cell.