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Relay switching-based lithium battery pack non-dissipative equalizing device

A non-destructive equalization and relay technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve the problems of battery energy waste, small equalization current, etc., and achieve the effects of shortened equalization time, large equalized current, and improved equalized efficiency

Inactive Publication Date: 2010-12-15
HEFEI SIMAKE ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the excess power in the single battery is consumed in vain by the bypass resistor, it causes waste of battery energy, and the discharge of the resistor will generate a lot of heat, so the equalization current of this method is also small

Method used

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  • Relay switching-based lithium battery pack non-dissipative equalizing device

Examples

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Embodiment Construction

[0015] Such as figure 1 As shown, a battery pack non-destructive balance device based on relay switching, using a series battery pack, DC / DC conversion unit, multiple double-pole relays and a detection control unit. The input terminal of the DC / DC conversion unit (DC / DC) is connected to the positive and negative poles In+ and In- of the series battery pack of single batteries BT1-BTn, and its output terminal is an isolated DC power supply Out+ and Out-. The voltage of the battery pack is converted into a DC power source that can charge the single battery through DC-DC conversion. The common end contacts of the balance control relays BR1-BRn are respectively connected in parallel to the positive and negative poles of the output end of the DC / DC conversion unit, and their normally open contacts are respectively connected to the positive and negative poles of the single cells in the battery pack; The positive and negative electrodes of each single battery in the group are respec...

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PUM

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Abstract

The invention discloses a relay switching-based lithium battery pack non-dissipative equalizing device, belongs to the technical field of battery protection and aims to provide the relay switching-based lithium battery pack non-dissipative equalizing device which has the advantages of high equalizing current, short equalizing time and high equalizing efficiency. The device comprises a battery pack, a current / current conversion unit, a plurality of double-pole relays and a detection control unit which are connected in series or parallel, wherein an input end of the current / current conversion unit is connected with the positive electrode and the negative electrode of the battery pack, while the output end is a path of isolated direct current power; one end of a normally open contact of each double-pole relay is connected in parallel with the positive electrode and the negative electrode of the output end of the current / current conversion unit respectively; the normally open contact at the other end is correspondingly connected with the positive electrode and the negative electrode of each single battery in the battery pack respectively; and the positive electrode and the negative electrode of each single battery in the battery pack are connected to the detection control unit through voltage detection flat cables respectively. High equalization of each single battery in the battery pack can be ensured by the device.

Description

technical field [0001] The invention relates to a lithium battery group non-destructive equalization device based on relay switching, which belongs to the technical field of battery protection. Background technique [0002] In recent years, power lithium battery packs have become more and more widely used in electric vehicles and large backup power supplies. Power lithium battery packs are generally composed of multiple single cells connected in series. If the difference in the consistency of the battery itself is not balanced in time, it will In the process of use, the difference is getting bigger and bigger, which eventually leads to a serious decline in the capacity of the entire battery pack. [0003] The battery pack balancing device is to dynamically adjust the consistency difference of the single cells in the battery pack through an external circuit to maintain the balance between the single cells. The most common method is to connect a bypass resistor in parallel at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 蒋富强江冠华
Owner HEFEI SIMAKE ELECTRONICS
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