Multiperspective Optimization of Cell and Module Dimensioning for Different Lithium‐Ion Cell Formats on Geometric and Generic Assumptions

Energy Technology, vol. 10

Abstract

The main challenge in developing electric and electrified vehicles is the drivetrain with the associated battery system. Within the battery system, individual modules consisting of multiple interconnected battery cells provide the engine with power and energy. A crucial part of developing the electric vehicle's battery is the optimized dimensioning of modules and cells. Therefore, designing a unified cell format may be a competitive advantage for original equipment manufacturers in rapidly changing market situations. Different constraints, such as peculiarities of different battery formats, module sizes, or required module voltages must be evaluated for optimized battery cell dimensioning. Herein, a holistic cell‐module optimization based on geometric and generic assumptions is provided. The presented model considers various factors like cell format‐dependent geometries and their limits, cell‐size specific cell‐to‐cell stacking distances as well as module geometries and voltage requirements. An application‐dependent energy and cost perspective analysis resulting in a user‐defined weighting model to optimize the cell format and its corresponding dimensions are investigated. Furthermore, the optimized module dimensioning for prior‐specified cells is introduced. Pareto‐optimal results within this analysis are discussed and enable the generic cell‐module optimization to be used in higher integrated battery system optimization models.

Authors 2

1. Alexander Epp corresponding Aachen Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA) Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA)

   RWTH Aachen University · Volkswagen Group (Germany)

   Affiliation as printed

   Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA) RWTH Aachen University 52066 Aachen Germany

   Technical Development Volkswagen AG 38436 Wolfsburg Germany

   Chair for Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, 52066 Aachen, Germany

   Technical Development, Volkswagen AG, 38436 Wolfsburg, Germany

2. Dirk Uwe Sauer Aachen Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA) Institute for Power Generation and Storage Systems (PGS) E.ON ERC Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA) Institute for Power Generation and Storage Systems (PGS)

   RWTH Aachen University · Forschungszentrum Jülich · Jülich Aachen Research Alliance · Helmholtz-Institute Münster

   Affiliation as printed

   Chair for Electrochemical Energy Conversion and Storage Systems Institute for Power Electronics and Electrical Drives (ISEA) RWTH Aachen University 52066 Aachen Germany

   Helmholtz Institute Münster (HI MS) IEK 12 Forschungszentrum Jülich 52425 Jülich Germany

   Institute for Power Generation and Storage Systems (PGS) E.ON ERC RWTH Aachen University 52074 Aachen Germany

   Jülich Aachen Research Alliance JARA-Energy 52056 Aachen Germany

   Chair for Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, 52066 Aachen, Germany

   Institute for Power Generation and Storage Systems (PGS), E.ON ERC, RWTH Aachen University, 52074 Aachen, Germany