Lithium ion battery pack equalizing circuit with automatic polarity switch

Abstract

The invention discloses a lithium ion battery pack equalizing circuit with automatic polarity switch. The circuit comprises two buses used as sampling and equalizing time-sharing multiplexing channels, a relay network, a sampling module, an equalizing module and a computation control module, wherein one end of the relay network is connected with each battery monomer of a lithium ion battery pack, and the other end of the relay network is connected with the two buses so as to realize gating of different battery monomers; the sampling module is connected to the two buses and used for scanning and collecting the voltage of each battery monomer; the equalizing module is connected to the two buses and used for automatically performing polarity switch so as to match the polarities of the two buses and performing equalizing charge or equalizing discharge on each battery monomer; and the computation control module is connected with the relay network, the sampling module and the equalizing module respectively and used for receiving and processing the data from the sampling module in real time and sending an equalizing instruction of the processing result to the relay network and the equalizing module. The lithium ion battery pack equalizing circuit with automatic polarity switch disclosed by the invention is safe and reliable, is simple in structure and low in cost, and is easy to produce in a large scale and suitable for the equalizing process of the lithium ion power battery pack of an electric vehicle formed by connecting battery monomers in series.

Description

technical field [0001] The invention relates to a charging and discharging management device for a power lithium-ion battery pack, in particular to a lithium-ion battery pack equalization circuit for automatic polarity switching of an electric vehicle, belonging to the technical field of automobile energy. Background technique [0002] At present, the development of electric vehicles is an important measure to promote energy saving and emission reduction and realize the greening of vehicles. As a key component of a hybrid electric vehicle, the traction battery has a major impact on the power, economy and safety of the vehicle. Therefore, in-depth research on the management and balancing technology of the traction battery is crucial to improving the performance of hybrid electric vehicles and ensuring the safe operation of the battery. , prolonging battery life, etc. have important theoretical significance and engineering application value. The voltage and capacity of a batt...

AI Technical Summary

Problems solved by technology

If a capacitor is used as a storage element, connecting it to all battery cells requires a huge switch array; if energy is stored in a magnetic field, the key element in the circuit is a transformer, but the conversion of electromagnetic energy is always It cannot be as complete as the theory, the various electromagnetic losses are very large, and it has the defects of complex circuit and low reliability; as for the active equalization circuit that uses resistance discharge combined with power supply charging, because the polarity must be based on Different battery cells need to be switched, so once the design is improper, the circuit will be too complicated and the safety is poor.

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