CN201478865U

CN201478865U - Improved charging balanced circuit

Info

Publication number: CN201478865U
Application number: CN2009203080074U
Authority: CN
Inventors: 傅晓晴; 王燕
Original assignee: Tianjin Lishen Special Power Supply Technology Co Ltd
Current assignee: Tianjin Lishen Special Power Supply Technology Co Ltd; Tianjin Lishen Battery JSCL
Priority date: 2009-08-14
Filing date: 2009-08-14
Publication date: 2010-05-19
Anticipated expiration: 2019-08-14

Abstract

The utility model discloses an improved charging balanced circuit, comprising a battery pack which is composed of a plurality of single batteries which are connected serially, two ends of the battery pack are connected with an external power supply, a charging control power switching tube Q1 is connected on the single battery in parallel, and each charging control power switching tube Q1 is respectively connected with one balanced module in parallel; the circuit further comprises a voltage comparer and a controller; compared with the prior art, the utility model discloses an improved charging balanced circuit, the structure is simple, the performance is reliable, and a serial charging mode and a parallel charging mode are supported, and the circuit is suitable for charging various battery packs, in particular to charge the battery packs which have high capacity and high current; the circuit can be widely used for the chargeable batteries and has important production practice significance.

Description

A kind of improved charge balancing circuit

Technical field

The utility model relates to rechargeable battery equalizing charge technical field, particularly relates to a kind of improved charge balancing circuit.

Background technology

At present, the charge balancing mode of lithium-ions battery group is mainly: in the charging latter stage of batteries, monitor the voltage of cell in the batteries by a balance module, referring to Fig. 1, a plurality of cells are connected mutually, when wherein the voltage of any cell is higher than 4.20V, start equalizing circuit, charge closing power controlling switching tube MOSFET, thus the cell that voltage is higher than 4.20V is stopped charging, can not influence charging normal of other batteries simultaneously.

Above-mentioned charge balancing mode mainly is to carry out equilibrium by the mode of the charging current that strengthens other branch roads that the cell that is full of electricity is stopped to charge.But, this charge balancing mode is mainly used in the charging modes of string charger, there is not portfolio effect for the charger that has and fill charging modes, and the precision of this charge balancing mode is lower, longer to battery needed time of charging, be not suitable for the battery pack of big capacity, big electric current is charged.

The utility model content

In view of this, the purpose of this utility model provides a kind of improved charge balancing circuit, its simple in structure, dependable performance, support simultaneously string fill charging modes and and fill charging modes, be applicable to various battery pack are charged, be particularly useful for the battery pack of big capacity, big electric current is charged, help extensively popularizing of rechargeable battery, be of great practical significance.

For this reason, the utility model provides a kind of improved charge balancing circuit, this circuit includes the battery pack of being made up of a plurality of cells of mutual series connection, described battery pack two ends and external power source join, all be parallel with a charging power controlling switching tube Q1 on each cell, each charging power controlling switching tube Q1 is in parallel with a balance module respectively;

Described balance module, be used for when it starts, controlling its charging power controlling switching tube Q1 that is in parallel disconnects, its cell in parallel is carried out and charging, when it is closed, control the charging power controlling switching tube Q1 conducting that it is in parallel, cut off the charge circuit of cell in parallel, make its cell in parallel stop charging;

This circuit also includes: voltage comparator, be used for gathering the voltage signal of each cell of battery pack, obtain the average voltage level of all cells, and the full charging voltage threshold value of the voltage of each cell and this average voltage level, cell compared, the output comparative result is given controller 300;

Controller, be connected with voltage comparator, the voltage that is used for showing certain cell when comparative result is during less than this average voltage level, control starts the balance module that this cell is in parallel, this cell is carried out and charging, and when comparative result shows that the voltage of certain cell is not less than full charging voltage threshold value, selectively close this balance module, cut off the charge circuit of this cell, this cell is stopped charging, perhaps cut off the string charging total loop of whole battery group simultaneously, start other cells balance module in parallel, other cells are carried out and charging.

Preferably, battery pack and a gross power switching tube Q2 of described a plurality of cell compositions are in series.

The technical scheme that is provided by above the utility model as seen, compared with prior art, the utility model provides a kind of improved charge balancing circuit, its simple in structure, dependable performance, support simultaneously string fill charging modes and and fill charging modes, be applicable to various battery pack charged, be particularly useful for the battery pack of big capacity, big electric current is charged, help extensively popularizing of rechargeable battery, be of great practical significance.

Description of drawings

Fig. 1 is the theory diagram of existing a kind of charge balancing circuit;

The theory diagram of a kind of improved charge balancing circuit that Fig. 2 provides for the utility model.

Embodiment

In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with drawings and embodiments.

Referring to Fig. 2, the utility model provides a kind of improved charge balancing circuit, this circuit includes the battery pack of being made up of a plurality of cells of mutual series connection, described battery pack two ends and external power source (B+ and B-) join, all be parallel with a charging power controlling switching tube MOSFET Q1 on each cell, each charging power controlling switching tube MOSFET Q1 is in parallel with a balance module 100 respectively;

Balance module 100, be used for when it starts, controlling its charging power controlling switching tube Q1 that is in parallel disconnects, its cell in parallel is carried out and charging, when it is closed, control the charging power controlling switching tube Q1 conducting that it is in parallel, cut off the charge circuit of cell in parallel, make its cell in parallel stop charging (stop to go here and there and fill and and charging);

Need to prove, the built-up circuit structure of described balance module 100 is identical with the structure of traditional equalization charging circuit, in the present invention, just embody mode that equalizing charge realizes and be by relatively controlling of cell and average voltage and undertaken and the mode of charging, rather than whether the voltage that passes through to judge cell of traditional (as described in the background section) arrives 4.20V and control the unlatching of carrying out balance module.

Voltage comparator 200, be used for gathering the voltage signal of each cell of battery pack, obtain the average voltage level of all cells, and the full charging voltage threshold value of the voltage of each cell and this average voltage level, cell is compared, the output comparative result is given controller 300;

Controller 300, be connected with voltage comparator 200, the voltage that is used for showing certain cell when comparative result is during less than this average voltage level, control starts the balance module 100 that this cell is in parallel, this cell is carried out and charging, and when comparative result shows that the voltage of certain cell is not less than full charging voltage threshold value, selectively close this balance module, cut off the charge circuit of this cell, this cell is stopped charging, perhaps cut off the string charging total loop of whole battery group simultaneously, start other cells balance module 100 in parallel, other cells are carried out and charging;

On the specific implementation, in the utility model, battery pack and a gross power switching tube Q2 that described a plurality of cell is formed are in series, controller 300 is used to transmit control signal to gross power switching tube Q2, control gross power switching tube Q2 disconnects or is closed, realizes the string charging total loop of cut-out or conducting whole battery group.

Need to prove, as mentioned above, by this controller 300, can realize cell is carried out and charging, and when the voltage of some cells is not less than full charging voltage threshold value, can selects that other cells are continued string as prior art and fill charging, strengthened charging current, can also select to start the balance module of other cells, other cells are carried out and charging, therefore to and fill charging modes and have good portfolio effect.

Need to prove, the charge balancing circuit that the utility model provides can support simultaneously string fill charging modes and and fill charging modes, be applicable to the charging of various battery pack, especially be suitable for the batteries charging of big capacity, big electric current.Battery pack can select to go here and there the mode of charging at the charging initial stage, control module is monitored in real time to the voltage of cell in the charging process, when in case the voltage of some cells is lower than average voltage level in the battery pack, can open balance module immediately and carry out large current charge, the charging response is timely and effective, has improved charge efficiency greatly.

The technical scheme that is provided by above the utility model as seen, the utility model provides a kind of improved charge balancing circuit, it is a kind of lithium-ions battery group charge balancing mode of simple in structure, dependable performance, support simultaneously string fill charging modes and and fill charging modes, be applicable to various battery pack are charged, be particularly useful for the battery pack of big capacity, big electric current is charged, help extensively popularizing of rechargeable battery, be of great practical significance.

The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.

Claims

1. improved charge balancing circuit, it is characterized in that, this circuit includes the battery pack of being made up of a plurality of cells of mutual series connection, described battery pack two ends and external power source join, all be parallel with a charging power controlling switching tube Q1 on each cell, each charging power controlling switching tube Q1 is in parallel with a balance module respectively;

2. charge balancing circuit as claimed in claim 1 is characterized in that, battery pack and a gross power switching tube Q2 that described a plurality of cells are formed are in series.