Five major safety problems and solutions for power lithium-ion batteries

Five safety issues and solutions for power lithium-ion batteries The five major safety issues of power batteries are discussed: battery safety 2. Group security 3. Battery management 4. Safety plan 5. This article selects 3 core issues from 5 questions to discuss important points, and proposes the group's processing ideas as follows: 1. Ideas for safe handling of batteries Group C: Standardization of batteries and battery modules can improve the following aspects through normalization: (1) In terms of planning, the battery planning issues should be exposed and dealt with together; (2) In terms of processing equipment, the degree of equipment standardization is correspondingly improved, and the equipment company’s product iteration speed is accelerated; (3) Continuous improvement and promotion of relevant experience are standardized , The relevant experience of excellent equipment suppliers and component suppliers can be promoted to the industry, so that all advancements are in the safety technology level of the battery industry. Group D: Cell normalization The standardization of cells can be reduced to the level of labor repetition. The standardization of the battery itself has brought great progress to the safety of the battery. If more manufacturers make the same standard battery, the cost of the battery will decrease and the safety will improve. From the perspective of urgency and realizability, it is more urgent and easier to realize. 2. Group safety method Group D: Thermal management plan is very important to battery safety. Group safety, good heat conduction planning, heat balance, BMS small current balance, but the temperature before the temperature difference caused by different battery voltage differences can be balanced, because In the electrochemical equation of a battery, the anode is positively correlated, and the cathode is negatively correlated. During the period, the term anode voltage difference is greater, so temperature has a great influence on its voltage. Of course, the welding process is also a very important aspect. Different welding processes will lead to uneven rise in internal resistance. Therefore, the safety of the group will be improved from these aspects. Group F: The electrical and thermal handling safety issues of the package are ultimately attributed to the battery module. The safety issues of batteries and battery packs are researched using the method of system theory. BMS should carry out accurate detection, control and early warning for each cell. At the same time, we must not only consider the safety of the battery, but also ignore its service life. We must not only ensure the safety of the battery, but also make possible progress in the service life of the battery. If there is no good service life, it will lose the reason to use lithium batteries. 3. Battery treatment group C: BMS safety strategy classifies battery systems and formulates corresponding safety goals. Based on the objectives, formulate and verify security policies for measurement, identification, and processing. If the industry can concentrate on doing this work well, it will be able to improve the safety level of batteries in a short period of time. Group F: Use BMS to detect, control and warn the battery. We should fundamentally believe that the lithium battery itself is unsafe, and make a guilty inference to it. It is an unsafe power equipment and needs to be controlled on the basis of BMS. , The external heating is out of control, and the recovery mechanism and equipment are timely. If a fire is found, the recovery equipment will be activated immediately. 4. Planning a safe production idea Group F: scientific and reasonable system planning, processing process control, various battery data, battery structure have their own advantages and disadvantages, but the degree of impact on safety is different, as long as the planning is scientific and the manufacturing is accurate, To a certain extent, a battery that can safely withstand power can be processed. 5. Handling Ideas for Charging Safety Group A: Add the battery quick check function to the charging device to charge the vehicle 80%-90%, and detect a large current. After replacing the DC memory, it is found that the battery pack is inconsistent. To achieve the purpose of fast physical inspection of the battery. Before the bag goes out, it will be a high current pulse charging and discharging, and the final high current pulse charging charge will cause a large discharge current pulse discharge. In this way, the combination of the battery is inconsistent, and it may be a battery problem. , Maybe there is a problem with cohesion, or there may be a problem with the cable, the high current pulse will obviously show some abnormalities. This method is suitable for the client, because the client has no detectable method other than the charging pile. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Know the function of lithium battery in one article