Switching system for active equalization of battery

Abstract

The invention discloses a switching system for the active equalization of a battery. The switching system comprises primary contacts, and the primary contacts are distributed on a substrate, and are connected with the two ends of single batteries in a battery pack. A driving device and a rotating shaft thereof are fixed on the substrate. A pointer is fixed on the rotating shaft. Secondary contacts are fixed on contact pre-tightening devices, and can form contact with the primary contacts. The contact pre-tightening devices are fixed on the pointer. The secondary contacts are connected with a direct current / direct current (DC / DC) converter. The substrate, the primary contacts, the driving device, the rotating shaft, the pointer, the secondary contacts and the contact pre-tightening devices form the switching system. The DC / DC converter is connected with a main loop of the battery pack, or is connected with another switching system. A battery management system (BMS) control system makes the pointer rotate at a primary contact corresponding to a single battery to be equalized through the driving device, the contact pre-tightening devices realize the contact conduction of the primary and secondary contacts, and a corresponding single battery is selected and communicated with the input pole of the DC / DC converter, and is charged or discharged to realize battery equalization. The system has the advantages of simple structure, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of battery balancing, and in particular relates to a switch system for active balancing of batteries. Background technique [0002] With the advancement and development of technology, new energy technologies such as electric vehicles have developed rapidly, and batteries have been widely used as important energy storage units. However, due to the influence of battery manufacturing, initial capacity, and ambient temperature, there are differences between batteries, so that the battery packs connected in series will cause some battery cells to overcharge and overdischarge in practical applications, affecting The use characteristics and life of the battery may even be in danger of explosion. [0003] The single DC / DC converter battery balancing system has a great cost advantage compared to the multi-DC / DC converter balancing system. Because it uses a single DC / DC converter, its conversion efficiency can easily...

AI Technical Summary

Problems solved by technology

Existing switching systems are generally implemented using power switching components such as Mosfet. However, for the case of a large number of battery cells connected in series in the field of electric vehicles, this switching system has high requirements for power components, a large number, and control. There are many semaphores, complex control, and there are disadvantages such as short-circuit risk

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