Incremental equalizing charge battery pack charging device

Abstract

The invention aims at providing a practical equalizing charge charging device which is different from most of equalized charging methods adopted at present. According to the equalizing charge principle of an incremental equalizing charge battery pack charging device, when a main charging loop normally conducts charging, all single batteries are patrolled, the battery which is least charged is found, the incremental charging is conducted on the battery, the charging speed of the battery is increased, and the equalizing charge of all the single batteries is achieved. By means of the charging method, the problem of the unnecessary electric energy waste caused by an equalized energy consumption type charging method and the problem that an equalized energy consumption type charging circuit is complex and hard to control are solved. In order to solve the problem that due to the fact that wrong connection exists in an energy supplementation type gating switch array, short-circuit accidents are caused, incremental auxiliary charging current switching is conducted through a current circuit changer structure, it is ensured that only one battery is selected and connected to an incremental current generator under all conditions, and no short circuits between batteries can be caused. In order to better conduct auxiliary incremental charging on the batteries, a voltage source auxiliary charging power supply which is used at present is replaced with an auxiliary current source.

Description

technical field [0001] The invention relates to a charging device for a power battery pack, in particular, a charging device suitable for balancing charging among single cells when a battery pack formed in series is charged. Background technique [0002] Power batteries, especially power lithium-ion batteries, are important components for electric energy storage. Power batteries have been widely used in many important fields such as energy, communications, national defense, and maritime affairs. Especially in recent years, electric vehicles, which are strongly supported by the state, need to rely on power batteries as energy sources. In practical applications, the power battery usually consists of multiple single cells connected in series or in parallel to form a battery pack. Because in the production process, there is no way to ensure that the characteristics of each single battery are completely consistent, which leads to differences in the performance of each single bat...

AI Technical Summary

Problems solved by technology

This charging method avoids the unnecessary waste of electric energy caused by the energy-consuming equalizing charging method and the complex control of the energy-transfer-type equalizing charging circuit.

In order to overcome the problem of short-circuit accidents caused by wrong conduction in the energy-supplementing gating switch array, the present invention uses a current switch structure for incremental auxiliary charging current switching, ensuring that only one battery is selected to be connected to the Incremental current generator, no short circuit between batteries

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