Battery Cell Assembly Magnetic Field Cancellation
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Solution Overview
Problem
Electric vehicle battery cell assemblies generate large magnetic fields, which are undesirable in the passenger compartment or nearby areas, necessitating a reduction in these fields without compromising performance.
Innovation Solution
The battery cell assembly is configured with battery cells arranged in two rows with end surfaces oriented to the same side and connected in series, incorporating an electromagnetic compensation conductor that passes through a sub-group of cells or inter-row connectors with inclined connections, creating small area conductor loops that cancel or reduce magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery cells are connected in series to provide large electric currents for propelling the electric vehicle, then the power output is improved, but large magnetic fields are generated in the surroundings which are harmful to the passenger compartment
Solution Approach 1:
The battery cells are divided into two rows with parallel line-up directions, and the series connection is segmented into intra-row connections and inter-row connections. This segmentation allows the conductor loops to be divided into smaller segments that can cancel each other's magnetic fields, reducing the overall harmful magnetic field while maintaining the required power output.
Solution Approach 2:
The inter-row connectors are arranged with inclined connection directions that are neither parallel nor perpendicular to the line-up direction. This asymmetric arrangement creates conductor loops with specific geometric properties that enable magnetic field cancellation between the two rows, effectively reducing the harmful magnetic fields in the surroundings while preserving the series connection for high power output.
2Area of stationary object
If battery cells are arranged in two rows with series connection to maintain compact design, then the space utilization is improved, but large conductor loops are created which increase magnetic field magnitude
Solution Approach 1:
The series connection path is segmented into intra-row connectors and inter-row connectors, creating multiple small conductor loops instead of one large loop. Each small loop generates a magnetic field that is canceled by the corresponding loop in the other row, reducing the net magnetic field magnitude while maintaining compact space utilization.
Solution Approach 2:
The inter-row connectors are positioned at inclined angles, introducing a diagonal dimension to the connection path. This dimensional change creates overlapping conductor loops in three-dimensional space that cancel each other's magnetic fields, allowing compact arrangement of battery cells while minimizing the magnetic field magnitude through geometric cancellation.
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 configuration effectively decreases magnetic fields in the vicinity of the battery cell assembly without affecting performance, allowing efficient use of space and reliable operation, while the electromagnetic compensation conductor or inclined connections ensure a cancellation effect on the magnetic fields.
Implementation Method 1
the electromagnetic compensation conductor has a cancellation effect on a magnetic field being created by the series connection of the battery cells
Implementation Method 2
the area of a conductor loop has a direct effect on the magnitude of a magnetic field
Data Source
AI summary
A battery cell assembly for a battery unit of an electric vehicle. The battery cell assembly includes a plurality of battery cells. The battery cells are arranged in two rows. All battery cells are electrically connected in series. Moreover, an electromagnetic compensation conductor is provided which is arranged such that the electromagnetic compensation conductor passes by at least a first sub-group of the battery cells. Alternatively or additionally, at least one electric inter-row connector electrically connecting one of the poles of one of the battery cells of a first row to one of the poles of one battery cell of a second row, is provided and a connection direction of the inter-row connector is inclined with respect to the line-up directions. Furthermore, a battery unit for an electric vehicle including at least one battery cell assembly is presented.