EV Battery Case Wiring Layout for Compact Motor Power Connection
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Solution Overview
Problem
Existing electric vehicles face an issue with the increased size of the region occupied by electric wires due to their distance between the battery case and the motor, which is not efficiently managed in previous designs.
Innovation Solution
The electric vehicle incorporates a battery case with a connection circuit where electric power lines from connectors are connected in an adjacent region near the connectors, utilizing dummy terminals and symmetric terminal arrangements to minimize wire volume and optimize wire placement, allowing for efficient power supply to the electric motor regardless of battery orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric power lines are routed separately for each connector to the motor control unit, then electrical connection reliability is improved, but the region occupied by electric wires increases in size
Solution Approach 1:
The patent combines multiple electric power lines from different connectors into a single integrated connection circuit within the battery case. This merging approach maintains reliable electrical connections while significantly reducing the overall space occupied by wire routing, as the connection portion is consolidated in one location rather than requiring separate wire paths for each connector.
Solution Approach 2:
The patent transitions from a distributed wire routing approach (extending wires from each connector to the motor control unit) to a centralized connection approach (consolidating connections within the battery case). This dimensional reorganization of the electrical connection architecture reduces the spatial footprint of the wiring system while maintaining connection integrity.
2Volume of stationary object
If the battery case size is reduced to improve compactness, then vehicle space efficiency is improved, but space for wire routing and connection components becomes insufficient
Solution Approach 1:
The patent integrates the connection circuit and connection portions directly within the battery case structure, merging previously separate components (wire routing paths and connection points) into a unified internal arrangement. This consolidation enables compact battery case design while accommodating all necessary electrical connections without requiring additional external space for wire management.
Solution Approach 2:
The patent nests the connection circuit and connection portions within the internal structure of the battery case, effectively placing one functional element inside another. This nesting approach maximizes space utilization within the battery case volume, allowing compact design while maintaining all required electrical connection functions.
Data Source
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AI summary
An electric vehicle (1) includes: an electric motor (M) that generates rotational power by which a driving wheel (3) is driven; a battery case (13) defining a battery accommodating space accommodating at least one battery (14); connectors (31) that are located in the battery case (13), accommodated in the battery accommodating space, and electrically connected to respective terminals of the battery (14); and electric power lines through which electric power of the battery (14) is supplied to the electric motor (M). The electric power lines include a connection circuit (57) that includes a connection portion (58, 59) where the electric power lines extending from the connectors (31) are connected to each other, the connection portion (58, 59) being located in an adjacent region (33) located adjacent to the connectors (31).