Equalization fault-tolerant circuit structure and equalization fault-tolerant method for series lithium battery pack

A lithium battery pack and fault-tolerant circuit technology, which is applied in battery circuit devices, battery/fuel cell control devices, circuit devices, etc., can solve problems such as safety accidents, lithium battery pack failure, and single lithium battery inconsistencies, so as to improve inconsistencies performance, ensuring reliability and safety, improving capacity utilization and the effect of remaining service life
CN109713744AInactive Publication Date: 2019-05-03NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2019-05-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an equalization fault-tolerant circuit structure and equalization fault-tolerant method for a series lithium battery pack. The equalization fault-tolerant circuit includes the reconstructed fault-tolerant loop, a battery selection network, and a flyback converter bridge network. Each lithium battery is connected in series with a group of bidirectional MOSFET shutdown switches, and is connected in parallel with a unidirectional MOSFET bypass switch and a diode to form the reconstructed fault-tolerant loop. The battery selection network consists of bidirectional MOSFET selection switches. Each lithium battery is connected to two groups of bidirectional MOSFET selection switches. Two adjacent lithium batteries share one group of bidirectional MOSFET selection switches.The flyback converter bridge network consists of a flyback converter, a MOSFET switch, and a diode. The equalization fault-tolerant method comprises estimating the state of charge and the state of health of each lithium battery; reconfiguring and isolating a certain lithium battery when the state of health of the certain lithium battery is lower than a failure threshold; calculating a capacity difference between the lithium battery having the most remaining capacity and the lithium battery having the least lithium battery; and starting equalization when the capacity difference is greater thana set threshold. The method improves the energy use efficiency, reliability and safety of the lithium battery pack.
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Description

technical field

[0001] The invention relates to the technical field of lithium battery energy balance and reconfigurability, in particular to a balance fault-tolerant circuit structure and a balance fault-tolerant method of a lithium battery pack connected in series. Background technique

[0002] Facing the increasingly urgent problems of energy depletion and environmental pollution, the development of new energy vehicles has become a common choice for all countries. Due to the low nominal voltage of single lithium batteries, multiple lithium battery cells need to be used in series to meet the power supply requirements of new energy vehicles. There is inconsistency between the single lithium batteries in the lithium battery pack, the lithium battery pack is repeatedly charged and discharged over time during use, and each lithium battery cell shows different degradation characteristics, especially one or more performance indicators are poor Lithium-ion batteries complete cha...

Claims

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