New energy battery testing direction

How EV power battery testing works?

EV power battery testing has three main elements, namely SOC, SOH and battery life prediction. The relationship between capacity loss L cal per d, the SOC and the temperature of the battery is shown for different temperatures in Fig. 1. As the temperature increases, the SOC gradually increases at the same reaction rate.

Can EV batteries be inspected online?

To the best of the authors’ knowledge, the contributions of this article are as follows: A complete solution for the whole life cycle online inspection and fault detection of EV batteries is proposed, using the SOC, SOH algorithm and drive method for special scenario application described in the paper.

Why is EV battery testing important?

With the continuous development of Evs (electric vehicles) and new energy, smart BESS (battery energy storage system) charging stations came into being, and the EV battery testing technology is particularly important.

How to measure EV battery health?

As one of the important indicators of EV battery health, the current mainstream SOC estimation methods are as follows: (1) Discharge test method; (2) Current integration method; (3) Kalman filtering algorithm. Fig. 4. EV battery testing device . .

What are the main contents of EV battery testing?

The main contents of EV battery testing are SOC, SOH and battery remaining life prediction. For SOC, currently, the major manufacturers mainly apply the current integration method. For SOH, currently, the major manufacturers mainly apply the voltage curve fitting method.

How to predict battery remaining life?

For battery remaining life prediction, currently, the major manufacturers mainly apply statistical patterns based on long-term data to estimate. The common point of the above methods is that they are easy to implement and less expensive, but the accuracy is low, and the estimation error is increasing with battery use.