Variable Cross Section Busbars for Hybrid Vehicle Energy Storage
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Solution Overview
Problem
Existing storage systems for electric energy in hybrid vehicles face challenges in achieving a favorable weight/performance ratio, as they need to provide high electric performance while being lightweight and compact.
Innovation Solution
A storage system with electrochemical batteries connected in series and parallel, utilizing rigid busbars with a variable cross section to minimize weight and optimize electric current density, allowing for efficient energy storage and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If rigid busbars with constant cross section are used to connect batteries in series and parallel, then electrical connection is ensured, but the weight of the busbars increases
Solution Approach 1:
The busbar cross-section is designed with variable dimensions along its length, with thicker sections at battery connection points and thinner sections in intermediate areas. This local variation in cross-sectional area optimizes the distribution of electrical current density, ensuring reliable electrical connections where needed while minimizing material usage and overall weight.
Solution Approach 2:
The busbar geometry parameter (cross-sectional area) is changed along its length rather than maintaining a constant cross-section. This parameter variation allows the busbar to adapt its electrical and mechanical properties to the specific requirements of different sections, reducing weight while maintaining connection reliability.
2Weight of moving object
If the cross section of busbars is reduced to minimize weight, then weight decreases, but electric current density distribution becomes uneven
Solution Approach 1:
The busbar cross-section is designed with variable dimensions along its length, with thicker sections at battery connection points and thinner sections in intermediate areas. This local variation in cross-sectional area optimizes the distribution of electrical current density, ensuring reliable electrical connections where needed while minimizing material usage and overall weight.
Solution Approach 2:
The busbar geometry parameter (cross-sectional area) is changed along its length rather than maintaining a constant cross-section. This parameter variation allows the busbar to adapt its electrical and mechanical properties to the specific requirements of different sections, reducing weight while maintaining connection reliability.
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
The solution reduces the weight of the busbars by up to 50% compared to those with constant sections, making the system more cost-effective and suitable for compact, high-performance applications in hybrid vehicles.
Implementation Method 1
A hybrid vehicle comprises an internal combustion thermal engine... and at least one electric machine which is electrically connected to a storage system for the storage of electric energy... The storage system for the storage of electric energy comprises a plurality of electrochemical batteries
Implementation Method 2
The storage system comprises rigid busbars having a variable cross section... allowing for efficient energy storage and transmission
Data Source
AI summary
A storage system for the storage of electric energy for a vehicle with electric propulsion; the storage system has: a plurality of chemical batteries, which are divided into groups, each of which comprises chemical batteries connected to each other in series and/or in parallel; and two rigid busbars, which connect the groups of chemical batteries in parallel and have respective connection portions, which constitute the connection terminals of the storage system to the outside; each rigid busbar has a variable cross section, which increases close to the connection portion, so that the cross section of each busbar is the largest at the connection portion and the smallest in correspondence to the end which lies the farthest from the connection portion.