Battery Module Conductive Strip Resistance Design
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Solution Overview
Problem
In battery modules where multiple cells are connected in parallel and series, local temperature increases in specific regions lead to uneven deterioration, resulting in reduced battery life as some cells deteriorate faster than others, affecting the overall module lifespan.
Innovation Solution
The battery module design incorporates conductive strips with varying electrical resistance values, where strips near the virtual line between positive and negative terminals have higher resistance to reduce current flow and those farther away have lower resistance, ensuring even current distribution and load application across cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery cells are connected in parallel to form battery groups, then the power output is increased, but local temperature increases occur in specific regions causing uneven deterioration
Solution Approach 1:
The patent applies local quality by varying the electrical resistance of conductive strips at different positions within the battery module. Conductive strips near the virtual line between terminals have higher resistance, while those farther away have lower resistance. This spatial variation in electrical property compensates for the non-uniform current distribution, ensuring more uniform temperature and current density across all battery cells, thereby preventing local overheating while maintaining high power output.
2Power
If battery cells are connected in parallel to form battery groups, then the power output is increased, but uneven deterioration among cells reduces overall battery life
Solution Approach 1:
The patent implements local quality by positioning conductive strips with different electrical resistance values at specific locations. Cells that would naturally receive higher current (and thus deteriorate faster) are connected through conductive strips with higher resistance, while cells receiving lower current are connected through strips with lower resistance. This compensatory approach equalizes the current burden across all cells, ensuring uniform deterioration and extending the overall battery module life while maintaining high power output capability.
3Device complexity
If conductive strips with uniform resistance are used, then the structure is simple, but current flows preferentially along the shortest distance causing uneven load distribution
Solution Approach 1:
The patent applies local quality by assigning different electrical resistance values to conductive strips based on their positions within the battery module. Instead of using uniform resistance throughout, the design strategically places higher resistance strips in regions where current would naturally concentrate (near the virtual line between terminals) and lower resistance strips in regions where current flow is naturally weaker. This creates a more uniform current and load distribution across all battery cells while maintaining relatively simple structural implementation.
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
This design extends the battery module's life by evenly progressing deterioration among cells, reducing variations in battery life and preventing premature failure.
Implementation Method 1
an electrical resistance value of the conductive strip arranged at a position near a virtual line drawn between the positive electrode terminal and the negative electrode terminal is high, and an electrical resistance value of the conductive strip arranged at a position other than the position near the virtual line is low
Data Source
AI summary
It is intended to provide a battery module having a long life by designing such that deterioration proceeds evenly among battery cells. Disclosed is a battery module including a plurality of battery groups being connected in series and each comprising a plurality of battery cells connected in parallel, wherein: a positive electrode terminal and a negative electrode terminal are provided; the battery groups are connected to each other by a plurality of electrically conductive strips; and an electrical resistance value of the conductive strip arranged at a position near a virtual line drawn between the positive electrode terminal and the negative electrode terminal is high, and an electrical resistance value of the conductive strip arranged at a position other than the position near the virtual line is low, the electrical resistance value being measured in a direction of charge and discharge current flow.