CN105896656A - Bidirectional equalization circuit - Google Patents
Bidirectional equalization circuit Download PDFInfo
- Publication number
- CN105896656A CN105896656A CN201610243493.0A CN201610243493A CN105896656A CN 105896656 A CN105896656 A CN 105896656A CN 201610243493 A CN201610243493 A CN 201610243493A CN 105896656 A CN105896656 A CN 105896656A
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- China
- Prior art keywords
- switch
- equalization circuit
- difference
- voltage
- equalizer
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a bidirectional equalization circuit. The bidirectional equalization circuit is characterized in that an equalization switch array is correspondingly connected with a plurality of battery cells one to one; a micro-control unit samples the plurality of battery cells, obtains the average voltage through calculation, calculates the absolute value of the difference between the maximum voltage and the average voltage, and the absolute value of the difference between the minimum voltage of the plurality of battery cells and the average voltage so as to obtain the high difference and the low difference, and compares the magnitude of the high difference with the magnitude of the low difference; if the high difference is greater than the low difference, the micro-control unit drives a passive equalization circuit to start and controls a switch corresponding to the maximum voltage, in the equalization switch array to start, and then the passive equalization circuit communicates with the battery cell corresponding to the maximum voltage; and when the high difference is lower than the low difference, the micro-control unit drives an active equalization circuit to start and controls a switch corresponding to the minimum voltage, in the equalization switch array to start, and then the active equalization circuit communicates with the battery cell corresponding to the minimum voltage. The bidirectional equalization circuit realizes bidirectional equalization of high and low voltage of circuit cells.
Description
Technical field
The present invention relates to bidirectional equalization circuit.
Background technology
In recent years, lithium battery group is more and more extensive in the application of the aspect such as electric automobile, energy storage.Lithium battery
Group in use, carries out connection in series-parallel often through single battery, to increase cell voltage and capacity, reaches
Actually used demand.Due to lithium battery monomer minute differences during fabrication, cause lithium battery group in reality
Discordance during use can be gradually increased, if carrying out equilibrium treatment not in time, constantly increases
Discordance can cause the life-span of lithium battery group to terminate in advance.
The balancer of set of cells is by external circuit, the concordance difference of battery cell to be entered
Mobile state adjusts, and improves the concordance of set of cells, makes set of cells reach equilibrium state.Equilibrium is the most normal at present
The mode seen is often to save a cell two ends power resistor in parallel and switch, when certain batteries voltage
Time higher, adhesive switchs, and consumes percentage of batteries energy by power resistor, maintains the equal of whole set of cells
Weighing apparatus state.On the one hand this mode needs the power resistor of number the same with battery single battery, and volume is relatively
Greatly, on the other hand cannot carry out the battery that electricity is relatively low mending electricity, equalization efficiency is the highest.
So need a kind of bidirectional equalization circuit of design badly.
Summary of the invention
It is an object of the invention to provide a kind of bidirectional equalization circuit, this bidirectional equalization circuit overcomes existing skill
Art do not has bidirectional equalization circuit, equalizes more single problem, it is achieved that the high-low voltage of circuit battery
Bidirectional equalization.
To achieve these goals, the invention provides a kind of bidirectional equalization circuit, this bidirectional equalization circuit
Including: micro-control unit, equalizer switch array, passive equalizing circuit and active equalization circuit, described micro-
Control unit is configured to be connected to equalizer switch array, passive equalizing circuit, active equalization circuit
With multiple cells, described equalizer switch array one_to_one corresponding is connected to multiple cell, institute
State micro-control unit multiple cells are sampled, and be calculated average voltage, and calculate multiple
The ceiling voltage of cell and minimum voltage respectively with the absolute value of the difference of average voltage to obtain the discrepancy in elevation
Value and low difference, ratio higher difference and the size of low difference, in the case of high difference is more than low difference,
Described micro-control unit drives passive equalizing circuit to start, and controls the highest electricity in described equalizer switch array
The switch open that pressure is corresponding, described passive equalizing circuit is communicated in the monomer electricity that described ceiling voltage is corresponding
Pond；In the case of high difference is less than low difference, described micro control unit drives active equalization circuit to start,
And controlling the switch open that in described equalizer switch array, minimum voltage is corresponding, described active equalization circuit is even
Lead in cell corresponding to described minimum voltage.
Preferably, described passive equalizing circuit includes: power resistor and electric discharge switching switch, described power
Resistance is electrically connected to one end of described electric discharge switching switch, the other end electrical connection of described electric discharge switching switch
In described equalizer switch array.
Preferably, described electric discharge switching switch is configured to be electrically connected to described micro-control unit, to realize
Guan Bi or disconnection.
Preferably, described equalizer switch array includes: multiple equalizer switches, multiple described cell phases
Series connection forms series battery mutually, and the first end of multiple described equalizer switch is connected to described in adjacent two
Between cell, and also it is connected to the of described equalizer switch at the two ends of described series battery
One end, the second end of described equalizer switch is connected to described electric discharge switching switch and benefit TURP changes switch.
Preferably, described active equalization circuit includes: isolation DC/DC and benefit TURP change switch, described
One end of isolation DC/DC is connected to low-voltage dc power supply, and the other end is connected to described benefit TURP and changes switch
One end, the other end that described benefit TURP changes switch is connected to described equalizer switch array.
Preferably, described benefit TURP changes switch and includes: the first switching switch and the second switching switch, described
First switching switch and described second switching switch Opposite direction connection are in described equalizer switch array.
By above-mentioned embodiment, the battery that electricity is high can be discharged by the present invention, it is also possible to electricity
Measure low battery to carry out mending electricity, be greatly improved equalization efficiency.Use switch arrays as the switching of equilibrium
Device, the power resistor needed for each lithium battery group several is become one from original ten, reduces equilibrium
The cost of circuit and volume.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the circuit diagram of a kind of bidirectional equalization circuit that the present invention is described.
Description of reference numerals
1 equalizer switch array 2 electric discharge switching switch
3 first switching switch 4 isolation DC/DCs
5 second switching switches
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
The present invention provides a kind of bidirectional equalization circuit, and this bidirectional equalization circuit includes: micro-control unit, all
Weighing apparatus switch arrays 1, passive equalizing circuit and active equalization circuit, described micro-control unit is configured composition
It is not connected to equalizer switch array 1, passive equalizing circuit, active equalization circuit and multiple cell,
Described equalizer switch array 1 one_to_one corresponding is connected to multiple cell, described micro-control unit pair
Multiple cells are sampled, and are calculated average voltage, and calculate the highest of multiple cell
Voltage and minimum voltage respectively with the absolute value of the difference of average voltage to obtain high difference and low difference, compare
High difference and the size of low difference, in the case of high difference is more than low difference, described micro-control unit drives
Dynamic passive equalizing circuit starts, and controls the switch that in described equalizer switch array 1, ceiling voltage is corresponding and open
Opening, described passive equalizing circuit is communicated in the cell that described ceiling voltage is corresponding；It is less than in high difference
In the case of low difference, described micro control unit drives active equalization circuit to start, and controls described equilibrium and open
Closing the switch open that in array 1, minimum voltage is corresponding, described active equalization circuit is communicated in described minimum electricity
The cell that pressure is corresponding.
By above-mentioned embodiment, the present invention use switch arrays as equilibrium switching device, each
Power resistor needed for lithium battery group several is become one from original ten, reduces the cost of equalizing circuit
With volume.And passive equalizing circuit is combined with active equalization circuit, the battery that electricity is high can be carried out
Electric discharge, it is also possible to carry out the battery that electricity is low mending electricity, be greatly improved equalization efficiency.
Below in conjunction with accompanying drawing 1, the present invention is further detailed, in the present invention, in order to improve this
The scope of application of invention, uses following detailed description of the invention to realize especially.
In a kind of detailed description of the invention of the present invention, described passive equalizing circuit may include that power electricity
Resistance and electric discharge switching switch 2, described power resistor is electrically connected to one end of described electric discharge switching switch 2,
The other end of described electric discharge switching switch 2 is electrically connected to described equalizer switch array 1.When electric discharge switching is opened
After closing 2 unlatchings, by power resistor, the battery that monomer voltage is high can be discharged.
In this kind of embodiment, described electric discharge switching switch 2 is configured to be electrically connected to described microcontroller
Unit, to realize Guan Bi or to disconnect.
In a kind of detailed description of the invention of the present invention, described equalizer switch array 1 may include that multiple
Equalizer switch, multiple described cells are serially connected formation series battery, and multiple described equilibrium is opened
The first end closed is connected between adjacent two described cells, and at the two ends of described series battery
Also be connected to the first end of described equalizer switch, the second end of described equalizer switch be connected to described in put
TURP changes switch 2 and benefit TURP changes switch.
Multiple switching devices are connected between equalizing circuit and battery by equalizer switch array 1, by often
The switch at joint cell two ends is controlled, and can be turned on and off equilibrium, reach the mesh accurately controlled
's.
In this kind of embodiment, described active equalization circuit may include that isolation DC/DC 4 and mends electricity
Switching switch, one end of described isolation DC/DC 4 is connected to low-voltage dc power supply, and the other end is connected to institute
Stating benefit TURP and change one end of switch, the other end that described benefit TURP changes switch is connected to described equalizer switch battle array
Row 1.After benefit TURP changes switch open, external power source is by battery relatively low to monomer voltage for DCDC
Carry out mending electricity.
In this kind of embodiment, described benefit TURP changes switch and may include that the first switching switch 3 and the
Two switching switches 5, described first switching switch 3 and described second switching switch 5 Opposite direction connections are in described
Equalizer switch array 1.So by the alternately switching of passive equalizing circuit with active equalization circuit, finally
Improve the concordance of whole set of cells, make whole set of cells reach equilibrium state.
As it is shown in figure 1, MCU (micro-control unit) travels through batteries monomer voltage, calculate set of cells and put down
All voltage, and compare with ceiling voltage with set of cells minimum voltage, when ceiling voltage is higher than average voltage more
Many, now open passive equilibrium, MCU controls electric discharge switching switch 2U1 and ceiling voltage monomer electricity
The equalizer switch U5 unlatching that pond is corresponding, is so discharged to it by power resistor.
When batteries monomer minimum voltage is more less than average voltage, now open and mend electric-type active equalization side
Case.Assuming that this batteries is B1, now MCU control is mended TURP and is changed switch U2 (the first switching switch
3) opening, the equalizer switch at B1 two ends is opened simultaneously, and such outer low pressure DC source is by isolation
DCDC4 U4 is that B1 batteries carries out mending electricity.If now lowest section cell voltage is B2, then MCU
Controlling to mend TURP and change switch U3 (the second switching switch 5) unlatching, the equilibrium at B2 battery two ends simultaneously is opened
Opening, such outer low pressure DC source is that B1 batteries carries out mending electricity by isolation DC/DC 4 U4.Mend
TURP changes the position in the unlatching Main Basis set of cells switching U2 and U3 residing for minimum monomer battery voltage
Put, if being that odd number is (such as B1, B3 in the position that set of cells is whole..), then open benefit TURP and change switch
U2, if being that even number is (such as B2, B4 in the position that set of cells is whole..), then open benefit TURP and change switch
U3, so prevents DCDC (DC-DC changes 1A/3.7V into for 12V in the present invention) outfan
Reversal connection, damages battery.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (6)
1. a bidirectional equalization circuit, it is characterised in that this bidirectional equalization circuit includes: microcontroller list
Unit, equalizer switch array (1), passive equalizing circuit and active equalization circuit, described micro-control unit quilt
It is configured to be connected to equalizer switch array (1), passive equalizing circuit, active equalization circuit and multiple
Cell, described equalizer switch array (1) one_to_one corresponding is connected to multiple cell, institute
State micro-control unit multiple cells are sampled, and be calculated average voltage, and calculate multiple
The ceiling voltage of cell and minimum voltage respectively with the absolute value of the difference of average voltage to obtain the discrepancy in elevation
Value and low difference, ratio higher difference and the size of low difference, in the case of high difference is more than low difference,
Described micro-control unit drives passive equalizing circuit to start, and controls in described equalizer switch array (1)
The switch open that ceiling voltage is corresponding, described passive equalizing circuit is communicated in the list that described ceiling voltage is corresponding
Body battery；In the case of high difference is less than low difference, described micro control unit drives active equalization circuit to open
Dynamic, and control the switch open that in described equalizer switch array (1), minimum voltage is corresponding, described active
Equalizing circuit is communicated in the cell that described minimum voltage is corresponding.
Bidirectional equalization circuit the most according to claim 1, it is characterised in that described passive equilibrium
Circuit includes: power resistor and electric discharge switching switch (2), described power resistor is electrically connected to described electric discharge
One end of switching switch (2), the other end of described electric discharge switching switch (2) is electrically connected to described equilibrium
Switch arrays (1).
Bidirectional equalization circuit the most according to claim 2, it is characterised in that described electric discharge switches
Switch (2) is configured to be electrically connected to described micro-control unit, to realize Guan Bi or to disconnect.
Bidirectional equalization circuit the most according to claim 1, it is characterised in that described equalizer switch
Array (1) including: multiple equalizer switches, and multiple described cells are serially connected formation series-connected cell
Group, and the first end of multiple described equalizer switch is connected between adjacent two described cells, and
The two ends of described series battery are also connected to the first end of described equalizer switch, described equalizer switch
The second end be connected to described electric discharge switching switch (2) and benefit TURP change switch.
Bidirectional equalization circuit the most according to claim 4, it is characterised in that described active equalization
Circuit includes: isolation DC/DC (4) and benefit TURP change switch, one end of described isolation DC/DC (4)
Being connected to low-voltage dc power supply, the other end is connected to described benefit TURP and changes one end of switch, described benefit TURP
The other end changing switch is connected to described equalizer switch array (1).
Bidirectional equalization circuit the most according to claim 1, it is characterised in that described benefit TURP changes
Switch includes: the first switching switch (3) and the second switching switch (5), described first switching switch (3)
With described second switching switch (5) Opposite direction connection in described equalizer switch array (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610243493.0A CN105896656A (en) | 2016-04-18 | 2016-04-18 | Bidirectional equalization circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610243493.0A CN105896656A (en) | 2016-04-18 | 2016-04-18 | Bidirectional equalization circuit |
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| CN105896656A true CN105896656A (en) | 2016-08-24 |
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| CN201610243493.0A Pending CN105896656A (en) | 2016-04-18 | 2016-04-18 | Bidirectional equalization circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230067A (en) * | 2016-08-31 | 2016-12-14 | 宋利军 | A kind of battery pack balancing charging circuit and balanced charging method |
| CN107097668A (en) * | 2017-05-03 | 2017-08-29 | 东莞钜威动力技术有限公司 | The passive equalizing circuit and its equalization methods and abatement detecting method of electric automobile |
| CN107425556A (en) * | 2016-12-19 | 2017-12-01 | 上海蓝诺新能源技术有限公司 | Battery balanced device and battery equalization method |
| CN107968452A (en) * | 2017-11-15 | 2018-04-27 | 上海理工大学 | A kind of passive mixed equilibrium system and method for the master of lithium-ion-power cell group |
| CN108199439A (en) * | 2018-01-24 | 2018-06-22 | 浙江正电信息科技股份有限公司 | A kind of lithium ion battery balanced device |
| CN108964172A (en) * | 2018-06-06 | 2018-12-07 | 安徽锐能科技有限公司 | Equalization methods for battery pack |
| CN109768595A (en) * | 2019-01-11 | 2019-05-17 | 河南理工大学 | A kind of series-connected cell group twin voltage mixed equilibrium control method |
| CN111435791A (en) * | 2019-01-11 | 2020-07-21 | 河南理工大学 | Double-voltage self-adaptive equalization control method for series battery pack |
| WO2021068972A1 (en) * | 2019-10-12 | 2021-04-15 | 山东大学 | Online monitoring and equalization circuit and method for series battery pack capacity in charged and discharged states |
| CN113466721A (en) * | 2021-08-31 | 2021-10-01 | 蜂巢能源科技有限公司 | Failure identification method and device for lithium ion battery, electronic equipment and medium |
| WO2023040458A1 (en) * | 2021-09-18 | 2023-03-23 | 上海玫克生储能科技有限公司 | Battery array management system and management method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230067A (en) * | 2016-08-31 | 2016-12-14 | 宋利军 | A kind of battery pack balancing charging circuit and balanced charging method |
| CN107425556A (en) * | 2016-12-19 | 2017-12-01 | 上海蓝诺新能源技术有限公司 | Battery balanced device and battery equalization method |
| CN107097668A (en) * | 2017-05-03 | 2017-08-29 | 东莞钜威动力技术有限公司 | The passive equalizing circuit and its equalization methods and abatement detecting method of electric automobile |
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| CN108199439A (en) * | 2018-01-24 | 2018-06-22 | 浙江正电信息科技股份有限公司 | A kind of lithium ion battery balanced device |
| CN108964172A (en) * | 2018-06-06 | 2018-12-07 | 安徽锐能科技有限公司 | Equalization methods for battery pack |
| CN109768595A (en) * | 2019-01-11 | 2019-05-17 | 河南理工大学 | A kind of series-connected cell group twin voltage mixed equilibrium control method |
| CN111435791A (en) * | 2019-01-11 | 2020-07-21 | 河南理工大学 | Double-voltage self-adaptive equalization control method for series battery pack |
| WO2021068972A1 (en) * | 2019-10-12 | 2021-04-15 | 山东大学 | Online monitoring and equalization circuit and method for series battery pack capacity in charged and discharged states |
| KR20210092721A (en) * | 2019-10-12 | 2021-07-26 | 산동 유니버시티 | Serial battery pack capacity online monitoring and charging/discharging dual state equalization circuit and method |
| KR102523648B1 (en) | 2019-10-12 | 2023-04-19 | 산동 유니버시티 | Series battery pack capacity online monitoring and charge/discharge dual state equalization circuit and method |
| US11831187B2 (en) | 2019-10-12 | 2023-11-28 | Shandong University | Series battery pack capacity on-line monitoring and charging/discharging dual-state equalization circuit and method |
| CN113466721A (en) * | 2021-08-31 | 2021-10-01 | 蜂巢能源科技有限公司 | Failure identification method and device for lithium ion battery, electronic equipment and medium |
| WO2023040458A1 (en) * | 2021-09-18 | 2023-03-23 | 上海玫克生储能科技有限公司 | Battery array management system and management method |
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