The development prospect of the power battery testing industry is very good, because it brings more benefits to the enterprise when in use, so it is favored by customers. In order to make everyone more familiar with it, understand its daily use and better bring benefits to the enterprise, then we will talk about the small knowledge points related to the reasons of power battery testing, I hope it can help more people and bring more benefits.
there are generally two reasons for the purpose of power battery testing: to understand the characteristics of the battery (starting from the battery itself): we need to understand the battery's capacity, internal resistance, voltage characteristics, rate characteristics, temperature characteristics, cycle life, energy density, etc. Important parameters. These parameters are needed to prove whether the tested battery has reached the original design goal, and also need to be better managed and controlled during the use of the battery through these parameters.
Evaluate the ability of the battery to meet the requirements (from the application scenario): This type of power battery testing can be understood as starting from the application requirements, deducting the characteristics that the battery should meet, and testing to verify whether the battery is testing to meet the standards. For example, the vehicle manufacturer will design a battery cold start test based on low-temperature driving, an energy efficiency test based on power consumption indicators, and a dynamic performance test based on vehicle climbing or acceleration scenarios. In addition, from the perspective of vehicle safety, tests such as overcharge and overdischarge, short circuit, over temperature, extrusion and puncture are designed.
So when we come into contact with a new test project for power battery testing, we can think about whether this test is to understand the battery or to evaluate the ability to meet the application scenario. With this level of knowledge, you can further understand the content. The static capacity test method (SCT) is used to measure the available capacity (including energy) of the battery at different ambient temperatures. Different companies and standards have differences in SCT testing methods, but the general idea is similar. Example: Under normal temperature (25 ℃) environment, the battery is fully charged according to the method specified by the battery manufacturer, and completely discharged to the cut-off voltage (2.5V) at a rate of 1C after being completely static. The environment was tested and the capacity (energy) released was recorded. In the actual experiment, the test can be repeated 3 times to take the average value to improve the accuracy.
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