Abstract
The specifications that define an automotive development project are established at an early point in the process and define the direction of such a development, and changing these decisions becomes more costly the further the project progresses. Tools to enable better consideration of choice can help prevent this. The tool presented is designed to aid with the decisions needed when embarking on the development of a vehicle that incorporates electric-vehicle technologies and the important choices made regarding the battery pack required by such a vehicle. The tool incorporates a sizing model for determining the number of cells and the configuration required to meet a specified battery requirement. The tool then uses a 1-d model to determine some of the basic thermal and power characteristics that can then be used to inform other parts of the design specification. When attached to a database containing cell information, the tool can pre-select candidate cells to meet the requirement, and rapid execution time of the tool means that it can be used to quickly compare between cell choices, at a level understandable by all stakeholders in the decision making process.
Highlights
When undertaking the development of a new automotive product, a set of initial requirements is drawn in order to meet the intended market space, covering aspects such as performance, lifespan, cost of use, cost of manufacture, price point and many other factors of its design [1]
The lithium ion battery systems currently favoured by electric vehicle (EV) systems are a rapidly growing market, with the number of providers of lithium ion cells growing at a steady rate [5]
As well as thermal information, details about the electrical performance and energy requirements of a drive cycle are included. This is useful to compare the differences in maximum levels with those seen in typical duty cycles
Summary
When undertaking the development of a new automotive product, a set of initial requirements is drawn in order to meet the intended market space, covering aspects such as performance, lifespan, cost of use, cost of manufacture, price point and many other factors of its design [1]. This leads to other requirement specifications such as sizing, technologies to use and other more engineering aspects of the initial design [2]. The battery represents a significant proportion of the product’s value [4], and its design can inform other aspects of system design such as cooling and electronic management systems
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