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release time:2023-04-07
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The rated voltage platform of a lithium iron phosphate battery is 3.2V, which is clear that the single -section battery is far from meeting the demand for electric battery voltage levels. On the other hand, the rated capacity of the lithium iron phosphate battery currently produced is limited. Taking the lithium cylindrical iron phosphate battery produced by Watma as an example, as one of the high -quality suppliers of domestic lithium iron phosphate energy solutions, the rated capacity of the monomer -of -iron iron phosphate battery that is mainly produced does not exceed 10AH, it is obvious that the single battery The capacity is far from the demand for electric vehicles for power battery capacity. Therefore, lithium iron phosphate batteries are often recommended to be connected in line in tandem before use.
However, due to the decentralization of performance parameters in the production process of monomer batteries, as the battery pack is increasing, the volume dispersability between the single battery will gradually increase with the increase in the number of charging and discharge. The performance of group performance decreases and the cycle life is shortened [-1, 17-18]. To this end, a balanced charging of the power battery pack is required to reduce the impact of the inconsistency of the single battery, improve the performance of the power battery pack, and extend the mileage of electric vehicles. Ore charging lithium iron phosphate battery is one of the most risk factors that trigger unsafe behaviors in batteries. The over -charge of lithium -ion batteries is mainly to use the organic solution electrolytes used. Organic solution electrolytes can achieve a reversible process of decomposition and composite because the water in the water solution battery cannot be achieved, which also causes it to be strongly reflected in excessive charging. In order to ensure the charging safety of the battery pack, the battery pack requires a special protection circuit for charging management in practical applications to avoid the single battery charging and extend the service life of the battery pack as much as possible.
The single battery management circuit will continue to consume power when connected to both ends of the single battery. Although the battery management system can reduce the power consumption by setting up the "low power consumption" mode when working or not working, it will still consume electricity, and the power consumed at this time will be greater than the self -discharge power of the monomer battery. For long -term shelving electric vehicles, even if electric vehicles are not used, because the single battery management circuit is still parallel to the single battery, the battery will continue to discharge until the discharge is damaged. Therefore, in order to avoid damage to the battery discharge due to a single battery management circuit, the corresponding automatic power circuit needs to be designed. This circuit can automatically disconnect the corresponding monomer battery management circuit when the battery voltage is lower than the set.
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