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2. Safety issues with power lithium batteries. Factors such as power lithium battery materials, separators, adhesives, structures, sealing, production processes, and production process control may all cause fire accidents. Although it is difficult to determine the specific cause of a power lithium-ion battery fire when an accident occurs, although it is possible to understand what causes a fire accident.
The development and verification of various materials for power lithium batteries takes 1-2 years, or even longer. Wang Zidong believes that the current practice of rapidly upgrading and upgrading the specific energy of power lithium-ion battery systems once a year in such countries is not coordinated with the development cycle required for passenger car power lithium-ion battery systems. As a result, many verification work cannot be fully verified, leading to frequent fire accidents.
Wang Zidong stated that without significant technological breakthroughs in materials, it is difficult for current power lithium batteries to achieve further breakthroughs after reaching a certain level of specific energy development. At the same time, the negative impact on safety is increasing.
3. High power DC charging. Most public charging stations use DC charging technology, which has the advantages of fast charging speed and short consumption time; The disadvantage is that it has an impact on the service life of power lithium batteries and poses a safety hazard.
4. Long service life and reliability of power lithium batteries. At present, there have been many problems where the driving range of electric buses has significantly decreased after 2 to 3 years of use, and seriously, due to the short driving range, they have stopped driving. The important reasons for the problems include poor battery performance (related to the production company), poor consistency (related to significant differences in battery cell performance and low level of group technology), and a lack of correct maintenance and upkeep.
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