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Simulation of Bus Bar and EDS Loss Disclosure Number: IPCOM000240135D
Publication Date: 2015-Jan-05
Document File: 1 page(s) / 188K

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Simulation of High Voltage Battery Bus Bar and Electrical Distribution System Losses

Battery packs contain numerous battery cells which are connected in various parallel and series configurations. Conductors along the high current path are part of the packaging and connection of the cells. These conductors will have a voltage drop across them that vary with current and temperature. The voltage drops across some conductors will be negligible while others will be significant.

This publication describes a method for a battery simulator to produce accurate dynamic voltages representative of a real battery pack and its internal losses. In addition to simulating individual cell voltages, battery simulators must also be able to simulate the bus bar and electrical distribution system losses. The simulator does this by increasing or decreasing output voltages based on a mathematical model of the real system components.

The diagram on the left depicts a representative battery pack with a bus bar. As current flows through the high current path, there will be a detectable voltage drop across the bus bar. The diagram on the right depicts the battery simulator simulating the same voltage drop based on an in silico mathematical model of the real system components.

Every simulated cell has an associated conductor resistance R. The conductor's voltage drop VBB is a function of R, simulated pack current I, and simulated temperature T, which will vary depending on the physical pro...