CN103904731A - Active equalization circuit and method of lithium battery pack in series - Google Patents
Active equalization circuit and method of lithium battery pack in series Download PDFInfo
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- CN103904731A CN103904731A CN201410080468.6A CN201410080468A CN103904731A CN 103904731 A CN103904731 A CN 103904731A CN 201410080468 A CN201410080468 A CN 201410080468A CN 103904731 A CN103904731 A CN 103904731A
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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
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Abstract
The invention discloses an active equalization method of a lithium battery pack in series. The active equalization method is in an energy-transferring type and can be used for equalization in the charging and discharging processes. The method includes the step that voltage sampling is performed on each battery in the battery pack in series, when voltage of each battery is lower than 90% of a nominal value, an equalization charge switching power source matched with the battery is used for charging the battery, and voltage at the two ends of the lithium battery pack serves as input voltage of the equalization charge switching power source. The invention further discloses an active equalization circuit of the lithium battery pack in series, wherein the active equalization circuit is used for implementing the active equalization method. The active equalization circuit comprises a main control circuit, an equalization gating circuit, equalization switch circuits and the equalization charging switching power sources in the active equalization method. The active equalization circuit and method are mainly used for equalizing the power type lithium batteries.
Description
Technical field
The present invention relates to a kind of voltage for all single batteries of controlling serial lithium battery group and keep basically identical equalizing circuit and method.
Background technology
Current, the development of power lithium-ion battery industry is very fast, and the capacity of monomer (single battery) is also increasing, applies also more and more wider.Insider knows, power lithium-ion battery is all serial lithium battery group conventionally, by several monomer series-connected forming, if cannot make self discharge difference between monomer keep strict conformance, will greatly shrink because the capacity volume variance between monomer causes active volume, and the capacity of battery is larger, phenomenon is obvious like this.For this reason, just need to adopt the voltage of each batteries in the balanced series battery of equalizing circuit.
Tradition equalizing circuit, can only be in charging to lithium battery, adopts the mode of the consumption-type electric discharges such as conductive discharge to carry out equilibrium, consumed the energy of battery, and fever phenomenon is more serious, causes the ability of equalization of circuit greatly to decline.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of shift energy type, and can be in charge and discharge process all can be balanced the active equalization method of serial lithium battery group.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of active equalization method of serial lithium battery group, the steps include: the every batteries in series battery to carry out voltage sample, when the voltage of single battery lower than nominal value 90% time, by the equalizing charge Switching Power Supply matching with this single battery, this single battery is charged, the both end voltage of described serial lithium battery group is as the input voltage of equalizing charge Switching Power Supply.
The present invention also provides a kind of active equalization circuit of the serial lithium battery group that realizes above-mentioned active equalization method, comprise: governor circuit, balanced gating circuit, equalizer switch circuit and equalization charging circuit, this equalization charging circuit is the equalizing charge Switching Power Supply described in the active equalization method of serial lithium battery group of the present invention, described governor circuit is connected with balanced gating circuit, described balanced gating circuit is connected with equalizer switch circuit, described equalizer switch circuit is connected with equalizing charge Switching Power Supply, the output of equalizing charge Switching Power Supply is connected with corresponding single battery.
Described governor circuit is connected with balanced gating circuit by serial communication bus.
Described balanced gating circuit adopts goes here and there into and goes out shift register.
Described equalizing charge Switching Power Supply comprises: ON-OFF control circuit and the feedback circuit of transformer, the output rectification circuit being connected with the secondary coil of transformer, switching tube, control switch pipe switch, one end of the primary coil of switching tube is connected with the output of switching tube, the other end of the primary coil of transformer is connected with the power supply of series battery, and the output of feedback circuit is connected with the feed side of ON-OFF control circuit.
Described feedback circuit comprises: voltage feedback circuit and current feedback circuit, voltage feedback circuit comprises the feedback coil being wound on described transformer and the bleeder circuit that is connected to feedback coil two ends, and the output of bleeder circuit is connected to the voltage feed side of ON-OFF control circuit as the output of voltage feedback circuit; Current feedback circuit comprises: be arranged on switching tube and publicly between current feedback resistance, the connecting place of switching tube and current feedback resistance is connected to the current fed end of ON-OFF control circuit.
The invention has the beneficial effects as follows: equalizing circuit of the present invention just shifts the energy of whole series battery between the monomer of series battery, almost do not lose, also seldom heating, can only balanced tens milliamperes compare with traditional consumption-type, euqalizing current of the present invention can be up to 5A～10A; And, in charging and discharging process, can implement series battery balanced, and, each equalizing charge Switching Power Supply all works alone, can realize multichannel simultaneously balanced, all the time all can ensure the equilibrium between the monomer of series battery, thereby greatly extend the useful life of series battery.
Brief description of the drawings
Fig. 1 is the structural representation of the active equalization circuit of serial lithium battery group of the present invention.
Reference numeral in Fig. 1 is: 1, governor circuit, 2, balanced gating circuit, 31, the first equalizer switch circuit, 32, the second equalizer switch circuit, 3n, N equalizer switch circuit, the 316, the 16 equalizer switch circuit, 41, the first equalizing charge Switching Power Supply, 42, the second equalizing charge Switching Power Supply, 4n, N equalizing charge Switching Power Supply, the 416, the 16 equalizing charge Switching Power Supply.
Fig. 2 is the local electrical schematic diagram corresponding with Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the series battery forming taking 16 batteries, as example, is described specific embodiment of the invention scheme in detail.
As Fig. 1, shown in Fig. 2, the active equalization circuit of a kind of serial lithium battery group of the present invention, comprise governor circuit 1, the balanced gating circuit 2 being connected with governor circuit 1 by serial communication bus, the first equalizer switch circuit 31 and the first equalizing charge Switching Power Supply 41 of answering in contrast, the second equalizer switch circuit 32 and the second equalizing charge Switching Power Supply 42 of answering in contrast, N to ten six equalizer switch circuit 3n～316 and with it N to ten six equalizing charge Switching Power Supply 4n～416 one to one, governor circuit 1 is connected with balanced gating circuit 2, 16 outputs of balanced gating circuit 2 are corresponding connected one by one with the gating end of the first to 16 equalizer switch circuit 31～316, the output of first to 16 equalizer switch circuit 31～316 is corresponding connected one by one with the control end of first to 16 equalizing charge Switching Power Supply 41～416, wherein, the first equalizing charge Switching Power Supply 41, comprise: transformer B11, the output rectification circuit being connected with the secondary coil of transformer B11, switching tube V11, ON-OFF control circuit and the feedback circuit of control switch pipe V11 switch, output rectification circuit is made up of diode 12 and capacitor C 13, ON-OFF control circuit is made up of U12, feedback circuit comprises: voltage feedback circuit and current feedback circuit, voltage feedback circuit comprises: the bleeder circuit that is wound on the feedback coil on transformer B11 and is made up of divider resistance R14 and R15, the output of voltage feedback circuit is that R15 is connected with the tie point of R15 and voltage feed side 4 pin of U12, described current feedback circuit comprises: be arranged on switching tube V11 and the current feedback resistance R 13 between GND publicly, the connecting place of switching tube V11 and current feedback resistance R 13 is connected to current fed end 3 pin of U12, one end of the primary coil of transformer B11 is connected with the output (drain electrode) of switching tube V11, the other end of the primary coil of transformer B11 is connected with the power supply VCC_P+ of series battery, improve conversion efficiency, the power supply VCC_P+ of series battery and be also provided with publicly capacitor C 21 between GND in order to improve power environment, in the present embodiment, in order to prevent that fast transient from causing switching tube V11 snowslide, the two ends of described transformer B11 primary coil also and be connected to resistance R 12 and diode D11 and be attempted by the absorbing circuit that the capacitor C 12 at R12 two ends forms, wherein, the negative pole of resistance R 12 and diode D11 is serially connected, the other end of resistance R 12 is connected with power supply VCC, and the positive pole of diode D11 is connected with the drain electrode of switching tube V11, described balanced gating circuit 2 has adopted two to go here and there into and go out shift register 74HC595, and the U161 in U21 to the 16 equalizer switch circuit in U11, the second equalizer switch circuit 32 in the first equalizer switch circuit 31 is solid-state switch.
When practical application, the output of the first to 16 equalizing charge Switching Power Supply 41～416 is connected with corresponding single battery respectively.
Describe operation principle of the present invention in detail as an example of the second equalizer switch circuit 32 and the second equalizing charge Switching Power Supply 42 of answering in contrast example below:
In the time of the low voltage of second monomer in series battery, governor circuit 1 sends to be controlled sequencing control the second tunnel control signal and opens, and gives this single battery (monomer) makeup energy, reduces the difference between each monomer.Detailed process is: in the time that S2 end control signal is delivered to 4 pin of U21 by resistance R 21, 5 pin of U21 and 2 pin are connected, thereby VCC (12V) is outputed to 6 pin of U22, U22 is DC-DC control chip, U22 output PWM drive switching tube V21, the continuous switch of switching tube V21 extracts energy from the power supply VCC_P+ (both end voltage of series battery) of series battery, by the secondary coil of transformer B21, after diode D22 rectification and capacitor C 23 filtering, deliver to second single battery (monomer) two ends of series battery, two pins of the feedback coil of transformer B21 are 9 pin and 10 pin of transformer B21, wherein, 10 pin meet GND publicly, the feedback coil of transformer B21 is after resistance R 24 and R25 dividing potential drop, deliver to pressure feedback port 4 pin of U22, switching tube V21 is connected to GND publicly by resistance R 23, the junction of switching tube V21 and resistance R 23 is connected to current feedback terminal 3 pin of U22 simultaneously.
Above-described embodiment does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (6)
1. the active equalization method of a serial lithium battery group, the steps include: the every batteries in series battery to carry out voltage sample, when the voltage of single battery lower than nominal value 90% time, by the equalizing charge Switching Power Supply matching with this single battery, this single battery is charged, the both end voltage of described serial lithium battery group is as the input voltage of equalizing charge Switching Power Supply.
2. the active equalization circuit of a serial lithium battery group, it is characterized in that, described active equalization circuit comprises: governor circuit, balanced gating circuit, equalizer switch circuit and equalization charging circuit, this equalization charging circuit is equalizing charge Switching Power Supply claimed in claim 1, described governor circuit is connected with balanced gating circuit, described balanced gating circuit is connected with equalizer switch circuit, described equalizer switch circuit is connected with equalizing charge Switching Power Supply, and the output of equalizing charge Switching Power Supply is connected with corresponding single battery.
3. the active equalization circuit of serial lithium battery group according to claim 2, is characterized in that, described governor circuit is connected with balanced gating circuit by serial communication bus.
4. the active equalization circuit of serial lithium battery group according to claim 3, is characterized in that, described balanced gating circuit adopts goes here and there into and goes out shift register.
5. according to the active equalization circuit of the serial lithium battery group described in claim 2,3 or 4, it is characterized in that, described equalizing charge Switching Power Supply comprises: ON-OFF control circuit and the feedback circuit of transformer, the output rectification circuit being connected with the secondary coil of transformer, switching tube, control switch pipe switch, one end of the primary coil of switching tube is connected with the output of switching tube, the other end of the primary coil of transformer is connected with the power supply of series battery, and the output of feedback circuit is connected with the feed side of ON-OFF control circuit.
6. the active equalization circuit of serial lithium battery group according to claim 5, it is characterized in that, described feedback circuit comprises: voltage feedback circuit and current feedback circuit, voltage feedback circuit comprises: be wound on feedback coil and the bleeder circuit that is connected to feedback coil two ends on described transformer, the output of bleeder circuit is connected to the voltage feed side of ON-OFF control circuit as the output of voltage feedback circuit; Current feedback circuit comprises: be arranged on switching tube and publicly between current feedback resistance, the connecting place of switching tube and current feedback resistance is connected to the current fed end of ON-OFF control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410080468.6A CN103904731A (en) | 2014-03-06 | 2014-03-06 | Active equalization circuit and method of lithium battery pack in series |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410080468.6A CN103904731A (en) | 2014-03-06 | 2014-03-06 | Active equalization circuit and method of lithium battery pack in series |
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| CN103904731A true CN103904731A (en) | 2014-07-02 |
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| CN201410080468.6A Pending CN103904731A (en) | 2014-03-06 | 2014-03-06 | Active equalization circuit and method of lithium battery pack in series |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2619058C2 (en) * | 2015-09-17 | 2017-05-11 | Акционерное общество "Государственный научный центр Российской Федерации Троицкий институт инновационных и термоядерных исследований" (АО "ГНЦ РФ ТРИНИТИ") | Method and device for load power supply from electrochemical current sources |
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| RU2619058C2 (en) * | 2015-09-17 | 2017-05-11 | Акционерное общество "Государственный научный центр Российской Федерации Троицкий институт инновационных и термоядерных исследований" (АО "ГНЦ РФ ТРИНИТИ") | Method and device for load power supply from electrochemical current sources |
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Application publication date: 20140702 |