![]() While another solution has a somewhat increased cost and two of the solutions have increased cost but offer the next logical step in battery data tracking and performance. One solution offers lower cost without compromising performance. The four concepts below offer distinctly different approaches to eliminating 100 voltage sense wires in EVs. There are several ways to improve on the baseline system. However, in both cases there are typically about 100 voltage sense wires. Others may put a wire harness “pigtail” on the CCB, eliminating half of the wire harness connectors (alternate baseline case). Today, some automakers and Tier One suppliers are mounting the CSE PCBA on or near the module, minimizing the wire harness length. ![]() The CSE is connected to the cell connecting board (CCB) with a wire harness. The CSE contain multi-cell battery module integrated circuits (BMIC) on each PCBA. With this new technology, range and overall performance of an EV can be improved in addition to creating greater reliability and safety.Ĭell sensing electronics (CSE) are typically positioned on a separate printed circuit board assembly (PCBA) near each battery module. ![]() Industry innovators are developing new technologies that can eliminate 100 wires and also collect cell data for preventive maintenance and warranty analysis, detect mismatched cells before irreversible damage to the entire battery pack, determine the temperature inside the cell and gather information for accurately calculating the State of Charge (SOC) with a simple measurement. There are several ways to achieve these goals with varying levels of modification to the battery management system (BMS), dependent upon the level of improvement desired and openness to BMS changes. The impact to cost, weight, labor, packaging space and resulting critical reliability could transform the EV driving experience as we know it. Imagine eliminating 100 wires and 200 electrical connections from every electric vehicle (EV). For example, a good guess for thisīattery data is initial_guess =. Parameters are defined in the circuit string. ![]() These inital guesses are passed in as a list in order the Would be defined as R0-p(R1,C1)-p(R2-Wo1,C2).Įach circuit, we want to fit also needs to have an initial guess for each Each element is defined by the function (in circuit-elements.py) followed by a single digit identifier. Series are separated by a dash ( -), and elements in parallel are wrapped inĪ p(, ). Of researchers to use the tool, impedance.py allows you to define aĬustom circuit with any combination of circuit elements. Next we want to define our impedance model. Functions for reading in files from a variety of vendors (ZPlot, Gamry, Parstat, Autolab, …) can be found in the preprocessing module! Step 3: Define your impedance model ¶ ![]()
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