Series power storage battery energy non-dissipative type equalization charging circuit

Abstract

The invention discloses a power storage battery energy non-dissipative type equalization charging circuit, and in a battery pack comprising multiple sections of power storage batteries, an equalization circuit module is connected beside each single battery, each equalization module comprises an energy storage inductor, a switching device and a diode, and the equalization modules are symmetrically distributed at both sides of the battery pack. When the switching device Sn in each equalization module is turned on, the charging and the energy storage for an inductor Ln is carried out by a corresponding battery Bn, and the current linearity of the inductor is increased; when the Sn is turned off, the energy in the inductor Ln continuously flows into other storage batteries through the diode, the energy storage induction of the upstream battery continuously flows into the downstream battery through the diode, and the energy storage induction of the downstream battery continuously flows into the upstream battery through the diode. By regulating the turn-on and turn-off time of the switching device in an equalization circuit, the energy transfer speed can be effectively regulated, the difference among all the single batteries is eliminated, the cycle service life of the battery pack is prolonged, and the power storage battery energy non-dissipative type equalization charging circuit has larger application value.

Description

technical field [0001] The invention relates to the field of charging a power battery pack, in particular to an energy non-dissipative equalizing charging circuit for a power battery pack. Background technique [0002] The series power battery pack has a very wide range of applications, especially in the occasions where multiple batteries need to be connected in series to meet the required power requirements, such as high-power instruments, UPS power supplies, electric bicycles and electric vehicles. In practical applications, the battery packs connected in series are usually installed in a box and charged as a whole. Due to the difference between batteries, after many charge and discharge cycles, the state of charge of each single battery is bound to be inconsistent, and the service life of the battery pack is greatly shortened as a result. Therefore, an effective balanced charging method is of great significance to make up for the inconsistency of the performance of the b...

AI Technical Summary

Problems solved by technology

This equalization method is simple and easy to implement, but when there is a large difference in the capacity of each single battery, it takes a long trickle charging time to make the battery pack fully balanced, and an excessively long charging time may cause a certain battery to be overcharged. battery damage

The trickle charging method is only suitable for secondary batteries such as lead-acid batteries, nickel-cadmium and nickel-metal hydride batteries, and cannot be used in lithium-ion batteries, which has certain limitations.

(3) Energy dissipation equalization: It is mainly realized by connecting shunt resistors in parallel on each single battery in the battery pack. This equalization circuit has a simple structure and can achieve equalization during the charging process of the battery pack. capacity of a single battery, so this method mainly has energy waste and heat dissipation problems

[0004] From the above, it can be seen that the current battery pack charge equalization method is still inefficient or energy-consuming, and there is still a lack of energy-dissipative high-efficiency equalization charging circuit

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