CN101887999B - Clock test-and-control type balanced charging method for lithium battery pack - Google Patents
Clock test-and-control type balanced charging method for lithium battery pack Download PDFInfo
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- CN101887999B CN101887999B CN2010101900004A CN201010190000A CN101887999B CN 101887999 B CN101887999 B CN 101887999B CN 2010101900004 A CN2010101900004 A CN 2010101900004A CN 201010190000 A CN201010190000 A CN 201010190000A CN 101887999 B CN101887999 B CN 101887999B
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- lithium battery
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- battery pack
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a clock test-and-control type balanced charging method of a lithium battery pack, wherein, a balanced charging circuit comprises the lithium battery pack, a plurality of module power supplies and a clock pulse generator, wherein, the lithium battery pack is composed of a plurality of single lithium batteries which are connected in series, an output end of each module power supply is correspondingly connected with the single lithium battery, and each module power supply is respectively equipped with an independent control switch; a pulse signal generated by the clock pulse generator controls connection and disconnection of the control switches of the plurality of the module power supplies; and each single lithium battery independently charges under control, and at the moment when the control switches of the module power supplies are disconnected and charging current is zero, the testing and controlling voltage of the corresponding single battery is sampled. The balanced charging method of the invention can eliminate influence of the charging loop resistance and the internal resistance of the battery, ensure voltage balance for each lithium battery during the charging process of the lithium battery pack and guarantee safety control against overcharge of each lithium battery pack.
Description
Technical field
The present invention relates to a kind of lithium battery group balance protection charging technique, relate in particular to a kind of clock test-and-control type balanced charging method for lithium battery pack.
Background technology
Along with being rooted in the hearts of the people of environmental consciousness, the newborn energy more and more receives the attention of countries in the world.The high-capacity lithium battery monomer voltage is big, volume is little, energy is high; Be the main body of new forms of energy battery applications from now on, but the safe charging problem is the difficult problem of lithium battery applications always, several single lithium battery series connection backs are formed battery pack and are used; Directly charging can cause every single lithium battery voltage can not be balanced consistent; In case a certain cell voltage superelevation behind 4.20V, the danger that can blast, how to control is the problem of being faced at present.The swift and violent urgent need of lithium battery group application development will be bigger the ability of equalization and balance protection charging method more reliably.
In the prior art, lithium battery balance protection charging method adopts the method for energy-dissipating type shunting more.Be that many consumed energies can not be accomplished the big current balance ability of power lithium battery again, high-capacity lithium battery does not have reliable balancing technique guarantee.
In the technique scheme, there is following problem at least:
Because the charging of lithium battery group is operated in low-voltage, under the current state, the cell voltage precision is measured in the resistance of output lead and internal resistance of cell influence.
Summary of the invention
The purpose of this invention is to provide a kind of can eliminate the charge circuit resistance and the internal resistance of cell influence, guarantee the clock test-and-control type balanced charging method for lithium battery pack of the accuracy of equalization of each lithium battery equalizing voltage in the lithium battery group charging process.
The objective of the invention is to realize through following technical scheme:
Clock test-and-control type balanced charging method for lithium battery pack of the present invention; The lithium battery group that comprises the single lithium battery composition of a plurality of mutual series connection; Also comprise a plurality of modular power sources; The output of each modular power source is corresponding to be connected with a single lithium battery, and each modular power source is respectively equipped with independent control switch;
Also comprise beat generator, the pulse signal that said beat generator produces is controlled the switching on and off of control switch of a plurality of modular power sources;
In the moment that the control switch of said modular power source breaks off, when charging current is zero, the observing and controlling voltage of corresponding cell is sampled.
Technical scheme by the invention described above provides can be found out, clock test-and-control type balanced charging method for lithium battery pack of the present invention is because the pulse signal that beat generator produces is controlled the switching on and off of control switch of a plurality of modular power sources; In the moment that the control switch of modular power source breaks off, when charging current is zero, the observing and controlling voltage of corresponding cell is sampled.Can deposit confession controller detection discriminating in the latch in gathering information of voltage, when this voltage reaches the battery upper voltage limit of setting, send out code, stop, realizing the balanced consistent target of over-charge protective and upper voltage limit this battery charge.Can eliminate the charge circuit resistance and the internal resistance of cell influence, guarantee the accuracy of equalization of each lithium battery equalizing voltage in the lithium battery group charging process.
Description of drawings
Fig. 1 is the circuit theory diagrams of clock test-and-control type balanced charging method for lithium battery pack of the present invention.
Embodiment
Clock test-and-control type balanced charging method for lithium battery pack of the present invention; Its preferable embodiment is as shown in Figure 1; The lithium battery group that comprises the single lithium battery composition of a plurality of mutual series connection; Also comprise a plurality of modular power sources, the output of each modular power source is corresponding to be connected with a single lithium battery, and each modular power source is respectively equipped with independent control switch; Also comprise beat generator, the pulse signal that beat generator produces is controlled the switching on and off of control switch of a plurality of modular power sources; In the moment that the control switch of modular power source breaks off, when charging current is zero, the observing and controlling voltage of corresponding cell is sampled.Can eliminate the charge circuit resistance and the internal resistance of cell influence, guarantee each lithium battery equalizing voltage in the lithium battery group charging process.
In the lithium battery group charging process, the independent controlled charging of each single lithium battery, when the charging voltage of this single lithium battery reached the lithium cell charging upper voltage limit, this single lithium battery stopped charging separately automatically.Guarantee can the not charge security control of excess of each lithium battery.
In Fig. 1, what power supply step-down conversion was adopted is that power transfer module is for easy simplified illustration.Also can adopt transformer to replace power module.
The embodiment of the invention can realize:
Realize that each lithium battery in the lithium battery group charging process all is independent controlled charging, when lithium cell charging voltage reaches the lithium cell charging upper voltage limit, stop charging automatically, guarantee each lithium battery excess of can not charging;
Accomplishing the maximum euqalizing current of power lithium battery constant current charge is the 2-30A equalization scheme;
Realize that each lithium battery can both reach same voltage accuracy by controlled charging in the lithium battery group charging process;
Realize that each lithium battery all carries out the observing and controlling voltage sample in the lithium battery group charging process when charging current is zero, eliminate the charge circuit resistance and the internal resistance of cell influence.Guaranteed the accuracy of equalization of each lithium battery equalizing voltage in the lithium battery group charging process.
Carry out detailed description in the face of the application's design principle down:
The charger of traditional concept is to be satisfied with lithium battery group safe charging, for solving every monomer battery voltage equalization problem of lithium battery group charging, must at first where find subject matter?
Find that through analyzing subject matter is: because the charging of lithium battery group is operated in low-voltage, under the current state, the cell voltage precision is measured in the resistance of output lead and internal resistance of cell influence.
For obtaining accurate observing and controlling cell voltage, imagination is interrupted charging current in lithium battery group charging process interval, in this intermittent time, measures cell voltage.Thereby obtain accurate observing and controlling cell voltage, or regard charging process the performance of a symphony melody as, design a command system and in charger, coordinate control charging, measurement, voltage identification process.This cybernetics system is set at the beat controller; The effect of beat controller is that control charging beat was closed 10 milliseconds in per ten seconds and at this charger cut out to charge, and charging current is zero the battery pack real voltage is collected voltage register hogging to discern to voltage identification.This purpose is in order to eliminate the conductor resistance and the internal resistance of cell to measuring the influence of lithium battery group voltage accuracy; Current sensor is gathered current signal control charger constant current charge; Upper voltage limit is made as each cell and is controlled at 4.20V; So just can guarantee the safe charging of each battery and effectively balanced control, reach safe order ground.
In the scheme of the present invention, charger can random acquisition lithium battery group real voltage be given controller in charging process; Charger realizes that the control signal of constant current charge is from each battery stochastical sampling; Equalizing charge is to be accomplished by cell observing and controlling, can guarantee that every monomer battery voltage is balanced consistent; Because the monomer charging is a charge independence process, so be applied to any group of number battery pack.
Make result of the test through tens model machines; Obtained the result that safe equilibrium is effectively charged for serial lithium battery; No matter batteries monomer lithium battery capacity difference have much after discharge voltage difference what; Implementing to guarantee that the voltage of every single lithium battery all is 4.20V after the equalizing charge, therefore guaranteeing the fail safe that the serial lithium battery group is used.
The present invention can save the baffle in the former design on the battery pack in concrete the application, realized big capacity equilibrium.Especially the advantage that in macrocell charging, has shown and filled, and to fill major function be that the lithium battery series connection is used safety guarantee is provided.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (1)
1. clock test-and-control type balanced charging method for lithium battery pack; The lithium battery group that comprises the single lithium battery composition of a plurality of mutual series connection; It is characterized in that; Comprise a plurality of modular power sources, the output of each modular power source is corresponding to be connected with a single lithium battery, and each modular power source is respectively equipped with independent control switch;
Also comprise beat generator, the pulse signal that said beat generator produces is controlled the switching on and off of control switch of a plurality of modular power sources;
In the moment that the control switch of said modular power source breaks off, when charging current is zero, the observing and controlling voltage of corresponding cell is sampled;
In the said lithium battery group charging process, the independent controlled charging of each single lithium battery, when the charging voltage of this single lithium battery reached the lithium cell charging upper voltage limit, this single lithium battery stopped charging separately automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101900004A CN101887999B (en) | 2010-05-25 | 2010-05-25 | Clock test-and-control type balanced charging method for lithium battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101900004A CN101887999B (en) | 2010-05-25 | 2010-05-25 | Clock test-and-control type balanced charging method for lithium battery pack |
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| Publication Number | Publication Date |
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| CN101887999A CN101887999A (en) | 2010-11-17 |
| CN101887999B true CN101887999B (en) | 2012-05-09 |
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| CN2010101900004A Expired - Fee Related CN101887999B (en) | 2010-05-25 | 2010-05-25 | Clock test-and-control type balanced charging method for lithium battery pack |
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| CN105762846A (en) * | 2014-12-15 | 2016-07-13 | 哈尔滨市三和佳美科技发展有限公司 | Series-connected farad capacitor safety charger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2446707Y (en) * | 2000-08-03 | 2001-09-05 | 黄以安 | Three stage controlled balance charger |
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| GB2429344B (en) * | 2004-05-24 | 2008-12-31 | Milwaukee Electric Tool Corp | Method and system for battery protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2446707Y (en) * | 2000-08-03 | 2001-09-05 | 黄以安 | Three stage controlled balance charger |
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| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN SHENLU ENERGY CO., LTD. Free format text: FORMER NAME: BEIJING TECROAD ENERGY CO., LTD. |
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Address after: 22 No. 300300 Tianjin District of Dongli City Huaming Road Patentee after: TIANJIN SHENLU ENERGY CO., LTD. Address before: 100176 Beijing City, Rongchang Beijing Economic Development Zone Industrial Park Longsheng Street No. 7 No. A1-101 Patentee before: Beijing Tecroad Energy Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20180525 |
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| CF01 | Termination of patent right due to non-payment of annual fee |