CN101938152B - Power battery pack equalizing circuit and method thereof - Google Patents
Power battery pack equalizing circuit and method thereof Download PDFInfo
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- CN101938152B CN101938152B CN2010102692812A CN201010269281A CN101938152B CN 101938152 B CN101938152 B CN 101938152B CN 2010102692812 A CN2010102692812 A CN 2010102692812A CN 201010269281 A CN201010269281 A CN 201010269281A CN 101938152 B CN101938152 B CN 101938152B
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Abstract
The invention discloses a power battery pack equalizing circuit and a power battery pack equalizing method, which are used for equalizing a power battery pack with at least two single batteries. The device comprises a battery pack, a sampling module, a control module, a dual-way DC/DC converter, an auxiliary power supply, and a relay network, wherein the power battery pack consists of at least two single batteries; the sampling module acquires the voltages of the single batteries; the dual-way DC/DC converter and the auxiliary power supply are used for charging and discharging the single batteries; and the relay network is connected with the battery pack and the dual-way DC/DC converter. In an equalizing process, the control module determines the single battery to be equalized according to the data of the sampling module and controls the closing and working modes of the dual-way DC/DC converter and the switching of the relay network, so that the battery to be equalized is charged or discharged. The power battery pack equalizing circuit and the power battery pack equalizing method can ensure that the voltage difference between the single batteries is no greater than a value set by the control module and improve the imbalance between the single batteries.
Description
Technical field
The present invention relates to the battery management technical field, relate to a kind of power battery pack equalizing circuit and equalization methods specifically.
Background technology
Conventional battery group balancing technique roughly can be divided into energy dissipation type and energy non-dissipative type.The energy dissipation type is when some cell is higher, and shunt resistance of parallel connection consumes the mode of unnecessary energy heat above that, makes global voltage reach balance.This method causes the waste of energy on the one hand, on the other hand because the restriction of time for balance makes a large amount of heat of branch stream, especially in jumbo battery pack, causes heat management to become difficult more.Energy non-dissipative type generally is to utilize energy-storage travelling wave tubes such as inductance or electric capacity, transfers to the energy of the high cell of energy on the low battery of energy.This kind method energy consumption is very little, but when the high cell distance of low cell of energy and energy was far, the required time was also very long, the battery pack of going here and there be not suitable for more.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency that prior art exists; A kind of power battery pack equalizing circuit and equalization methods thereof are provided; Can the noenergy loss, realize the equilibrium of power battery pack fast, and at batteries charging, discharge and it is kept in balance when leaving standstill.
In order to solve above-mentioned purpose, the technical scheme that the present invention takes is:
A kind of power battery pack equalizing circuit; Said power battery pack is made up of two battery cell series connection at least; This equalizing circuit comprises the voltage acquisition module that said power battery pack is sampled; Be used for battery cell is carried out the accessory power supply and the two-way DC/DC converter of charge or discharge; With the relay network that the forward power of said two-way DC/DC converter stream output links to each other with battery pack, be used for the control module of power flow direction of folding and the two-way DC/DC converter of each relay of control relay network; Said control module is connected with the control end of two-way DC/DC converter and the output of voltage acquisition module respectively, and the forward power stream input of said accessory power supply and two-way DC/DC converter is connected.
In the above-mentioned power battery pack equalizing circuit; Said relay network is to be made up of the number double-contact normally opened relay identical with the battery cell number; Each double-contact normally opened relay all has two and opens and closes parts; One of them opens and closes parts and has first port and second port, and another opens and closes parts and has the 3rd port and the 4th port; The open and-shut mode of each double-contact normally opened relay is controlled by said control module; Corresponding one by one between battery cell and the double-contact normally opened relay; The two ends of each battery cell are connected with a corresponding double-contact normally opened relay, by control module through being connected and disconnection between double-contact normally opened relay control battery cell and the two-way DC/DC converter.
In the above-mentioned power battery pack equalizing circuit; Each other in battery cell of butt joint and the double-contact normally opened relay; First port of double-contact normally opened relay is connected with the positive pole of battery cell; The 3rd port is connected with the battery cell negative pole, and second port is connected with the positive pole of two-way DC/DC converter forward power stream output, and the 4th port is connected with the negative pole of two-way DC/DC converter forward power stream output.
The equalization methods of above-mentioned equalizing circuit comprises following steps:
Step 1, control module confirm to treat the balanced battery cell and the power flow direction of two-way DC/DC converter according to the signal of voltage acquisition module;
Step 2, control module are treated that with said balanced battery cell links to each other with two-way DC/DC converter through the control relay network, and are started two-way DC/DC converter;
In the above-mentioned equalization methods, when treating that balanced battery cell comprises when a plurality of, accessory power supply preferentially carries out equilibrium to maximum battery to be balanced monomer; In all battery to be balanced monomers, the difference of the battery cell equalizing voltage that the voltage of said maximum battery to be balanced monomer and control module are set is maximum.
In the above-mentioned equalization methods, control module makes the said battery cell of equilibrium of treating link to each other with two-way DC/DC converter through controlling and treat the closure of the double-contact normally opened relay that balanced battery cell is connected.
In the above-mentioned equalization methods; When the voltage of battery to be balanced monomer is lower than said battery cell equalizing voltage; Control module is controlled the power flow direction of two-way DC/DC converter for to flow to the battery to be balanced monomer from accessory power supply, and accessory power supply charges to the battery to be balanced monomer through two-way DC/DC converter; When the voltage of battery to be balanced monomer is higher than said battery cell equalizing voltage; The power flow direction that control module is controlled two-way DC/DC converter for from the battery to be balanced monomer flow to accessory power supply, the battery to be balanced monomer charges to accessory power supply through two-way DC/DC converter.
In said method, when treating that balanced battery cell comprises when a plurality of, accessory power supply preferentially treats that to maximum balanced battery cell carries out equilibrium.Said maximum battery to be balanced monomer is the maximum battery cell of equalizing voltage difference that battery cell voltage and control module are set.
The present invention compared with prior art, has following advantage and effect owing in power battery pack, adopted above-mentioned equalizing circuit and method:
The present invention can the noenergy loss, realize the equilibrium of power battery pack fast, and at batteries charging, discharge and it is kept in balance when leaving standstill; Can guarantee that voltage difference between the battery cell is no more than the value that control module is set, improve unbalanced between battery cell.Simultaneously, can also carry out fast uniform to battery pack with higher electric current, and energy loss is very little in the balancing procedure.At batteries charging, discharge and it is kept in balance when leaving standstill.
Description of drawings
Fig. 1 is an overall construction drawing of the present invention.
Fig. 2 is the sketch map that opens and closes parts in the double-contact normally opened relay.
Embodiment
Be described further below in conjunction with the accompanying drawing specific embodiments of the invention, but protection scope of the present invention and enforcement are not limited thereto.
Referring to Fig. 1, Fig. 1 has provided the overall construction drawing of the equalizing circuit of example of the present invention, wherein; Power battery pack 1 is by C1, C2 ..., n battery cell such as Cn be in series; N>1, double-pole normally opened relay K1, K2 ..., Kn forms relay network 2, said relay network is to be made up of the number double-contact normally opened relay identical with the battery cell number; Wherein 21 is the anode interface of relay network 2, and 22 is the negative pole interface of relay network 2.The positive pole of the power circuit forward output 7 of two-way DC/DC converter 5 links to each other with relay network anode interface 21; Negative pole links to each other with relay network negative pole interface; Power circuit positive input 8 is connected with accessory power supply 6, and the control end 9 of two-way DC/DC converter links to each other with control module 4.Voltage acquisition module 3 is made up of voltage sampling circuit and interface circuit; Be used for gathering the voltage of each battery cell; Control module 4 is controlled the switching and the mode of operation of two-way DC/DC converter 5 according to the signal of voltage acquisition module; And the switching at relay networking 2, control module 4 can adopt by interface circuit, single-chip microcomputer and drive circuit to be formed.
Fig. 2 is the sketch map that opens and closes parts in the double-contact normally opened relay; Said relay network is to be made up of the number double-contact normally opened relay identical with the battery cell number; Each double-contact normally opened relay all has two and opens and closes parts; One of them opens and closes parts and has first port and second port, and another opens and closes parts and has the 3rd port and the 4th port; The open and-shut mode of each double-contact normally opened relay is controlled by said control module; Corresponding one by one between battery cell and the double-contact normally opened relay; Dock with two ports of a corresponding double-contact normally opened relay at the two ends of each battery cell; Two other port of double-contact normally opened relay is connected with two-way DC/DC conversion, by control module through being connected and disconnection between double-contact normally opened relay control battery cell and the two-way DC/DC converter.
Can know from Fig. 1; Each other in battery cell of butt joint and the double-contact normally opened relay; First port of double-contact normally opened relay is connected with the positive pole of battery cell; The 3rd port is connected with the battery cell negative pole, and second port is connected with the positive pole of two-way DC/DC converter forward power stream output, and the 4th port is connected with the negative pole of two-way DC/DC converter forward power stream output.
In the course of work, control module 4 determines whether that needs are balanced and treats balanced battery cell according to the signal of voltage acquisition module, adopts and fill the low high method of putting.
When treating balanced battery cell brownout, control module control corresponding relays is connected the battery cell of treating equilibrium and two-way DC/DC converter 5, and sends enabling signal and forward mode of operation signal for two-way DC/DC converter 5.Energy is that power circuit positive input from two-way DC/DC converter 5 flows to power circuit forward output under the said forward mode of operation, and accessory power supply 6 is given and treated balanced battery cell charging.
When treating balanced battery cell overtension, control module control corresponding relays is connected the battery cell of treating equilibrium and two-way DC/DC converter 5, and sends enabling signal and reverse mode of operation signal for two-way DC/DC converter 5.Energy is that power circuit forward output from two-way DC/DC converter 5 flows to the power circuit positive input under the said reverse mode of operation, treats that balanced battery cell gives accessory power supply 6 chargings.
Claims (3)
1. power battery pack equalizing circuit; Said power battery pack is made up of two battery cell series connection at least; It is characterized in that this equalizing circuit comprises the voltage acquisition module that said power battery pack is sampled; Be used for battery cell is carried out the accessory power supply and the two-way DC/DC converter of charge or discharge; With the relay network that the forward power of said two-way DC/DC converter stream output links to each other with battery pack, be used for the control module of power flow direction of folding and the two-way DC/DC converter of each relay of control relay network; Said control module is connected with the control end of two-way DC/DC converter and the output of voltage acquisition module respectively, and the forward power stream input of said accessory power supply and two-way DC/DC converter is connected; Said relay network is to be made up of the number double-contact normally opened relay identical with the battery cell number; Each double-contact normally opened relay all has two and opens and closes parts; One of them opens and closes parts and has first port and second port, and another opens and closes parts and has the 3rd port and the 4th port; The open and-shut mode of each double-contact normally opened relay is controlled by said control module; Corresponding one by one between battery cell and the double-contact normally opened relay; The two ends of each battery cell are connected with a corresponding double-contact normally opened relay, by control module through being connected and disconnection between double-contact normally opened relay control battery cell and the two-way DC/DC converter; Each other in battery cell of butt joint and the double-contact normally opened relay; First port of double-contact normally opened relay is connected with the positive pole of battery cell; The 3rd port is connected with the battery cell negative pole; Second port is connected with the positive pole of two-way DC/DC converter forward power stream output, and the 4th port is connected with the negative pole of two-way DC/DC converter forward power stream output.
2. the equalization methods of the said equalizing circuit of claim 1 is characterized in that comprising following steps:
Step 1, control module confirm to treat the balanced battery cell and the power flow direction of two-way DC/DC converter according to the signal of voltage acquisition module;
Step 2, control module are treated that with said balanced battery cell links to each other with two-way DC/DC converter through the control relay network, and are started two-way DC/DC converter;
Step 3, accessory power supply carry out charge or discharge through two-way DC/DC converter to the battery to be balanced monomer;
In this method, when treating that balanced battery cell comprises when a plurality of, accessory power supply preferentially carries out equilibrium to maximum battery to be balanced monomer; In all battery to be balanced monomers, the difference of the battery cell equalizing voltage that the voltage of said maximum battery to be balanced monomer and control module are set is maximum;
When the voltage of battery to be balanced monomer is lower than said battery cell equalizing voltage; Control module is controlled the power flow direction of two-way DC/DC converter for to flow to the battery to be balanced monomer from accessory power supply, and accessory power supply charges to the battery to be balanced monomer through two-way DC/DC converter; When the voltage of battery to be balanced monomer is higher than said battery cell equalizing voltage; The power flow direction that control module is controlled two-way DC/DC converter for from the battery to be balanced monomer flow to accessory power supply, the battery to be balanced monomer charges to accessory power supply through two-way DC/DC converter.
3. according to right 2 described equalization methods, be characterised in that control module makes the said battery cell of equilibrium of treating link to each other with two-way DC/DC converter through controlling and treat the closure of the double-contact normally opened relay that balanced battery cell is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102692812A CN101938152B (en) | 2010-09-01 | 2010-09-01 | Power battery pack equalizing circuit and method thereof |
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| CN2010102692812A CN101938152B (en) | 2010-09-01 | 2010-09-01 | Power battery pack equalizing circuit and method thereof |
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| CN101938152A CN101938152A (en) | 2011-01-05 |
| CN101938152B true CN101938152B (en) | 2012-08-22 |
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| CN107870304A (en) * | 2017-11-09 | 2018-04-03 | 郑州云海信息技术有限公司 | A kind of method and device of monitoring BBU batteries balance |
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