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Battery pack electricity equalization circuit and equalization method

A battery pack electric power and equalization circuit technology, which is applied in charge equalization circuit, battery circuit device, secondary battery charging/discharging, etc., can solve the problems of high electric power of series batteries and increased circuit cost, so as to increase available capacity and reduce EV , Improve the effect of unbalanced phenomenon

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of high or low power that may occur in series batteries, solutions include parallel resistor shunt method, bidirectional DC-DC equalization method, coaxial transformer equalization method and other equalization circuits, but these circuits have transformers, which increase the cost of the circuit

Method used

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  • Battery pack electricity equalization circuit and equalization method
  • Battery pack electricity equalization circuit and equalization method
  • Battery pack electricity equalization circuit and equalization method

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] figure 1 A structural schematic diagram of a battery equalizing circuit as an example of the present invention is given, which includes a main circuit, an auxiliary power supply module, a single-chip microcomputer control module (commonly used single-chip microcomputers can be used), and a driving module. The main circuit includes N lead-acid batteries or lithium-ion batteries connected in series, and the first to (N-1) balancing unit circuits, such as Figure 5 , each equalizing unit circuit is connected to the three terminals (positive pole, positive and negative connection point, negative pole) of two adjacent batteries respectively, the first equalizing unit circuit includes a first switching tube, a second switching tube, a first a diode, a second diode, a f...

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Abstract

The invention discloses a battery pack electricity equalization circuit. The battery pack electricity equalization circuit comprises N-1 battery equalization unit circuits, N voltage sampling circuits, an auxiliary power module, a single-chip microcomputer control module and a driver module, wherein the Kth voltage sampling circuit and the (K+1)th voltage sampling circuit acquire a voltage at two ends of a Kth battery and a voltage at two ends of a (K+1)th battery, and transmit the voltages to the single-chip microcomputer control module; the single-chip microcomputer control module outputs a driver signal to the driver module according to the voltages; the driver signal output by the driver module is transmitted to the Kth battery equalization unit circuit; and the Kth battery equalization unit circuit controls the Kth battery to be discharged and the (K+1)th battery to be charged or controls the Kth battery to be charged and the (K+1)th battery to be discharged, so that electricity equalization of the Kth battery and the (K+1)th battery can be achieved, wherein K is greater than or equal to 1 and less than or equal to N-1. According to the equalization circuit and method, the equalization circuit is simple in structure, high in conversion efficiency, low in cost and high in reliability, and can expand the available capacity of a battery pack and prolong the service life of the battery pack.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a battery pack power balance circuit and a balance method, which are suitable for series rechargeable battery packs. Background technique [0002] In the new energy system, the battery system is an indispensable and important part. In recent years, electric bicycles, hybrid vehicles, electric vehicles, fuel cell vehicles, etc. , light weight and green environmental protection and other advantages have attracted people's attention. The key to the safety and reliability control of the battery use process lies in the battery management system, not only to ensure the safe and reliable use of the battery, but also to give full play to the battery's ability and prolong its service life. A battery pack usually includes several battery cells connected in series, and the imbalance among these battery cells will be caused by the difference of each battery cell in various aspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/441H02J7/0019H02J7/0026H02J7/00302H02J7/00306Y02E60/10
Inventor 康龙云李臻齐如军王书彪
Owner SOUTH CHINA UNIV OF TECH
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