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Electronic switch type equalizing circuit of power battery management system

A technology for electronic switching and balancing circuits, applied in battery circuit devices, circuit devices, current collectors, etc., can solve problems such as low stability of relays, improve driving power and electromagnetic interference, long service life, and solve common mode problems. Effects of voltage problems

Active Publication Date: 2013-12-18
江苏羚翎应急装备科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Working in the high vibration environment of the car, the stability of relays working with moving parts is lower than that of electronic switches

Method used

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  • Electronic switch type equalizing circuit of power battery management system
  • Electronic switch type equalizing circuit of power battery management system
  • Electronic switch type equalizing circuit of power battery management system

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the drawings.

[0029] This circuit is used in conjunction with the voltage detection and control circuit of the battery management system.

[0030] Since the power battery is in an open circuit, there is a certain relationship between the state of charge (SOC) of the single battery and the open circuit voltage (OCV). Here, it is believed that the voltage equalization of the single battery can achieve the balanced battery pack state of charge ( SOC) effect.

[0031] The precise detection circuit detects the voltage of each battery, and the MCU determines the number of single cells whose voltage is lower than the average voltage, and the time and current that need to be balanced.

[0032] The MCU gives a control signal, selects the equalizing branch corresponding to the single battery, and controls the voltage and current of the equalizing power supply, so that the single battery can be balanced.

[0033] T...

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Abstract

The invention provides an electronic switch type equalizing circuit of a power battery management system, which is applied to an equalizing network or a similar switch network of the power battery management system. According to the equalizing circuit, a plurality of equalizing subcircuits are combined to work in parallel; one equalizing branch is gated each time; each equalizing subcircuit consists of an input isolating circuit, an MOS (Metal Oxide Semiconductor) driving circuit and an MOS electronic switch; two collocation methods of the electronic switch and the network of the equalizing circuit are provided to be respectively applied to different application conditions of a low-voltage battery pack and a higher-voltage battery pack; and the influence of common mode voltage on the equalizing subcircuits in the network when in paralleled combination use is eliminated through adjusting a connecting method of pull-down resistors of the equalizing subcircuits and limiting the current direction of the MOS electronic switches. According to the equalizing circuit, the electronic switch circuit replaces a traditional switch network comprising a relay, a common switch and the like, so that the equalizing circuit is miniaturized and integrated, the production is convenient, and the service life, the response speed, the electromagnetic interference and the like are improved.

Description

Technical field [0001] The invention relates to the field of automobile power battery management systems, and in particular to an electronic switch type equalization circuit. Background technique [0002] For a long time, the switch network of the equalization circuit is composed of switches such as relays. Because the relays contain electromagnetic coils and mechanical structures such as moving and static plates, their volume is large, and most of them are plug-in packages that are not easy to integrate and automated production. ; The response speed is slow, reaching mS level; the power consumption of driving the relay is relatively large; due to the existence of the input coil, there are contact arcs and bounces during the state switching, and there is electromagnetic interference. [0003] Because there are no mechanical parts, electronic switches can be made smaller in size. Most of them are SMD packaging to facilitate integration and automated production; electronic switches h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 张育华孙金虎
Owner 江苏羚翎应急装备科技有限公司
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