What factors affect the safety of batteries?

The first is the evaluation of the safety structure-efficiency relationship between the material and the battery level. For the testing and evaluation of material properties, universities and research institutes have done a lot of work, and there are also very advanced equipment and testing methods to characterize the properties of materials. In the past ten years or so, we have done a lot of research on the characteristics of the battery, regarding its various safety test items. In fact, when I was testing, we called it a black box test. After the battery was made from materials, what happened during the entire reaction and use process, there are actually many things that we don’t know. So it's a black box test. In fact, we are now more hoping to improve the safety of the battery more. What we are concerned about is what kind of process response is in the process of use, and this process response, I can It cannot be observed non-destructively, so as to better know what role the material plays in the performance of the battery's safety performance, and what kind of improvement it can make. So in this process, including the experts mentioned just now that the change of SCI membrane is the focus of everyone's concern, there are other factors. In fact, what we are trying to do now is to use in-situ CT or in-situ neutron diffraction, in-situ scanning and other methods, hoping to make the black box gradually become more transparent, and we can see that it is used throughout. During the process, some of its changes and some of its actual qualitative parameters can be detected quantitatively or as quantitatively as possible, so as to know its safe structure-activity relationship. The battery cell level I want to talk about is the safety of the battery. Today, Mr. Wang Chaoyang said that in the future, I hope to be able to make large unmanaged batteries. I think it may still be an ideal for now. The actual battery is an electrochemical carrier that dynamically changes throughout its life cycle. Its safety and availability boundary itself is a dynamic change, so we hope to know. First, its own possible level of safety. What is it. The second thing is to know how its security level changes during its entire life cycle and under different life cycle states. To see that it is actually available, this is an animation we drew. Seeing that its usable boundary has been shrinking, how can we ensure that the boundary under our control of the electric vehicle is always safe throughout its life cycle? This is what we must pay attention to. The third level is the management system. Now this increase in energy density raises more and higher requirements on the management system, or places more expectations on it. Now regarding the management system, its evaluation is becoming more and more important. There are two national standards for the management system being drafted. One is the comprehensive requirements of the management system, and the other is the functional safety of the management system. These two standards You can take a look. In fact, we divide the battery management system evaluation into five categories, one is balance and the other is SOX. Just now, Mr. Ma analyzed some of his methods in detail. The actual SOH method will be in the group that we will learn next Tuesday. The standard project will quantify its specific test methods. In addition, the electromagnetic compatibility function is safe. Another, more important thing is the evaluation of thermal management. In fact, we are also working on a group standard. Next Wednesday we will discuss the specific draft of this group standard. We will focus on this. In the actual use process, its thermal management cooling, heating, heat preservation, and uniform temperature 、Can the energy consumption meet the actual use requirements of our thermal management, and whether it can reach such a target value as originally designed. When we mention us here, we may need to care about how the thermal management system is designed. We rely on a large number of tests and evaluations. In fact, for this test and evaluation, we have also established an evaluation system, the most important of which is the acquisition of the thermal characteristics of the battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are the hazards of overcharging to the battery?