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1.2V NiMH batteries manufacturers speculate: Active balancing is the future trend of BMS 1.2V NiMH batteries management systems
1.2V NiMH batteries manufacturers speculate that active balancing is the future trend of BMS 1.2V NiMH batteries management systems. The rapid development of new energy vehicles has brought huge opportunities and challenges to the development of the battery management system market. For a long time, the debate on the BMS technical route of electric vehicles has mainly focused on whether the BMS system should adopt active balancing or passive balancing technology. 1.2V NiMH batteries manufacturers speculate that active balancing is the future trend of BMS 1.2V NiMH batteries management systems.
BMS active balancing and passive balancing
As the name suggests, passive balancing is to consume the individual cells with slightly more capacity in the single battery to achieve overall balance. Active balancing is to transfer the slightly higher energy of the single unit to the slightly lower energy battery through the energy storage link. What is achieved is an active distribution effect.
BMS passive balancing technology has been applied in the electric market before active balancing, and the technology is relatively mature. The passive balancing structure is simpler and is widely used; while the active balancing is more complex, and the design of the transformer scheme and the switch matrix will undoubtedly increase the cost significantly. However, passive equalization also has significant shortcomings. Due to its simple structure and low production cost, it uses resistors to consume energy and generate heat, which will reduce the efficiency of the entire system. Active balancing adopts the principle of energy transfer and distribution, so the energy utilization rate is higher than passive balancing.
Active balancing is the future trend of BMS 1.2V NiMH batteries management system
As my country's battery technology level improves, the quality of lithium batteries is increasingly improved, and the battery imbalance phenomenon will be improved to a certain extent. However, the cause of battery imbalance is caused by temperature differences. It is not a problem that can be solved by the battery itself. It is a problem that the battery system should comprehensively consider.
In the future, as the number of battery management system companies increases and technical requirements upgrade, the battery management system industry will usher in further reshuffles in the industry. According to industry experts, the current price of battery management systems is still high, and prices will decrease with the expansion of production scale in the future. The price of the battery management system is positively related to the number of cells in the battery pack, and the battery management system accounts for 30% of the total cost of the battery pack.
At the same time, considering that the circuit board and chip design of BMS are still in the early stages of research and development, and the complexity, replacement speed and mass production scale of later products will gradually increase, it is expected that the price of mainstream battery management systems will slowly decline. The trend can drop to the current level of about 60% in 2020.
Active balancing effect
First, improving the consistency of the monomers can delay the attenuation of the battery pack capacity and extend the life of the battery pack. Second, protecting the battery core can avoid and improve the long-term overcharge and over-discharge state of a certain battery cell. Third, save costs. Reduce battery pack capacity and reduce thermal management design requirements. It also reduces the maintenance costs of the battery pack due to the consistency of the individual cells, and even the cost of battery replacement.
Active balancing technology has solved the problems encountered by customers during operation such as rapid short-term capacity attenuation of fast-charging batteries and lithium iron phosphate batteries after they go online.
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