End Bus Bar Layout for Compact Rectangular Cell Stacks
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Solution Overview
Problem
The interference between end bus bars of stacked rectangular cells in a battery configuration leads to an increase in spacing between cell stacks, which is undesirable.
Innovation Solution
The end bus bars of adjacent cell stacks are arranged such that their tip end parts are positioned side by side in the stacking direction, with one bus bar's tip end part being below and shifted towards the other, and stabilized by support stands and bolts, preventing interference and maintaining compact spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If end bus bars are fixed to terminals of rectangular cells positioned at end parts in the stacking direction, then external connection is achieved, but the end bus bars interfere with each other and spacing between cell stacks increases
Solution Approach 1:
The patent applies dimensionality change by arranging the tip end parts of end bus bars not only side by side in the stacking direction but also at different heights (vertical dimension). Specifically, the tip end part of the second end bus bar is positioned below the tip end part of the first end bus bar, utilizing the vertical dimension to resolve the interference problem while maintaining compact horizontal spacing between cell stacks
2Object-generated harmful factors
If end bus bars are arranged side by side in the stacking direction, then interference between bus bars is prevented, but device complexity increases due to additional positioning requirements
Solution Approach 1:
The patent applies the nesting principle by integrating the positioning function into the existing support stands that already hold the cell stacks. The support stands are designed to simultaneously support the cell stacks and position the tip end parts of the end bus bars at appropriate heights and locations, eliminating the need for separate positioning mechanisms and reducing overall device complexity
Data Source
AI summary
A battery includes a first cell stack (FCS) and a second cell stack (SCS) in which rectangular cells (RCs), each having a terminal provided on respective end surfaces thereof in longitudinal direction, are stacked. FCS and SCS are arranged side by side so that first and second ends of FCS correspond to first and second ends of SCS, respectively, in stacking direction. A base part of a first end bus bar (FEBB) is fixed to a terminal of RC positioned the closest to the first end of FCS, and a base part of a second end bus bar (SEBB) is fixed to a terminal of RC positioned the closest to the first end of SCS. SEBB's tip end part (TEP) is arranged below FEBB's TEP and shifted toward the first end of SCS, and FEBB's TEP and SEBB's TEP are arranged side by side in stacking direction.