📈 Ramp-Up Model

Overview

In battery cell simulations, current ramping is an essential strategy to prevent non-physical transients and numerical instability that can arise from abrupt current steps. Applying a current instantaneously can introduce high-frequency artifacts or convergence issues in certain electrochemical and thermal models. To avoid this, a smooth transition from 0 to the target current is often applied, known as a ramp-up.

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Why Use a Ramp-Up?

• Physical realism: In real-world systems, power electronics and control loops rarely apply a step input instantly. A ramp reflects this behavior more accurately.

• Numerical stability: Sudden changes in current can lead to instability or oscillations in the solver, particularly for tightly coupled electrochemical-thermal systems.

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Implementation in the Simulation

Our implementation uses a sinusoidal ramp function, providing a smooth, differentiable curve that avoids sharp discontinuities. The user can choose to use the ramp up function in their simulation by setting the following model setting:

{"RampUp": "Sinusoidal"}