Battery Pack Wiring Length Optimization for Power Loss Reduction
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Solution Overview
Problem
In electric motor vehicles equipped with both high-output and high-capacity batteries, there is a lack of effective solutions to reduce power transmission loss between the frequently used high-capacity battery and the power control unit (PCU), which affects fuel efficiency.
Innovation Solution
The implementation of a battery pack configuration where the high-capacity battery, with a larger capacity and smaller output, is connected to the PCU via shorter internal wiring compared to the high-output battery, and is often located closer to the PCU, reducing electrical power transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the high-capacity battery is connected via longer wiring to the PCU, then the battery can be positioned more flexibly in the vehicle, but power transmission loss increases
Solution Approach 1:
The patent applies local quality by making the wiring length specific to each battery type based on its usage characteristics. The high-capacity battery (frequently used) is connected with shorter wiring to minimize transmission loss, while the high-output battery (less frequently used) can have longer wiring. This differentiated wiring strategy optimizes power transmission efficiency for the frequently accessed battery without compromising system flexibility.
2Loss of energy
If the high-capacity battery is positioned closer to the PCU, then power transmission efficiency improves, but the battery layout flexibility in the vehicle is reduced
Solution Approach 1:
The patent implements local quality by assigning different spatial priorities to different battery types based on their operational importance. The high-capacity battery is positioned closer to the PCU (favorable position) to minimize transmission loss during frequent operations, while the high-output battery can be positioned farther away. This creates a non-uniform spatial distribution that optimizes overall system efficiency.
3Loss of energy
If equal wiring length is used for both batteries, then the wiring system is simpler to design, but power transmission loss increases for the frequently used high-capacity battery
Solution Approach 1:
The patent applies local quality by differentiating wiring characteristics based on the specific requirements of each battery type. The high-capacity battery receives shorter wiring optimized for frequent power transmission, while the high-output battery has longer wiring. This targeted approach reduces overall power loss without requiring complete redesign of the entire wiring system, thus balancing performance improvement with design complexity.
Data Source
AI summary
An electric motor vehicle including: a high-output assembled battery; a high-capacity assembled battery having a larger capacity and a smaller output than those of the high-output assembled battery; and an inverter, and the electric motor vehicle is equipped with a PCU that transmits and receives electric power to and from the high-output assembled battery and the high-capacity assembled battery, a first wiring that connects the high-output assembled battery to the PCU, and a second wiring that connects the high-capacity assembled battery to the PCU, and is shorter than the first wiring.