CN104135048B - On-line lithium battery pack equilibrium method - Google Patents

On-line lithium battery pack equilibrium method Download PDF

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Publication number
CN104135048B
CN104135048B CN201410343229.5A CN201410343229A CN104135048B CN 104135048 B CN104135048 B CN 104135048B CN 201410343229 A CN201410343229 A CN 201410343229A CN 104135048 B CN104135048 B CN 104135048B
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voltage
cells
detection
lithium battery
signal
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CN104135048A (en
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贲礼进
陈继永
浦振托
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Jiangsu College of Engineering and Technology
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Jiangsu College of Engineering and Technology
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Abstract

The invention discloses an on-line lithium battery pack equilibrium method which comprises a lithium battery pack formed by connecting a plurality of lithium batteries in series, a 4-channel analog switch, a subtractor, an A/D (Analog-to-Digital) switching circuit and a main control chip MCU. A voltage detection signal is extracted between every two lithium batteries connected in series in the lithium battery pack and sent to input ends of the 4-channel analog switch, each detection signal is in correspondence to two 4-channel input ends, by controlling an enable end of the 4-channel analog switch, different detection signals are gated, and a difference value is sent to the A/D switching circuit by the subtractor, the main control chip MCU completes the voltage detection of the period according to a read A/D switching value, after the detection, the storage battery pack with the highest voltage discharges for the storage battery pack with the lowest voltage, so that battery equilibrium management is achieved, and then next detection and equilibrium circulation is carried out.

Description

A kind of online lithium battery group equalization methods
Technical field
The present invention relates to field of power electronics, more particularly, to a kind of battery balanced control field.
Background technology
At present, lithium ion battery is widely used in commercial production and the every field of people's life.But lithium battery pair Charge-discharge power demand is very high, when overcharging, cross put, overcurrent and when occurring situations such as short circuit, lithium battery pressure is rolled up with heat, Easily produce spark, burning is even exploded.Therefore, to be overcharged and Cross prevention in charge and discharge process, also will be noted simultaneously The discordance of meaning cell, needs cell state to be carried out with on-line checking and carries out Balance route.But lithium battery is equal The difficult point that weighing apparatus control technology is always research is located, and can accurately and effectively carry out cell on-line checking and carry out efficiently equal The method that weighing apparatus is processed is little.
Content of the invention
For solving the problems, such as above-mentioned prior art, it is an object of the invention to provide a kind of online lithium battery group equilibrium Method, can accurately detect in series battery that each cell state adopting an effective measure is carried out at equilibrium between cell Reason.
For reaching above-mentioned purpose, the technical scheme is that:
A kind of online lithium battery group equalization methods, comprise the steps:
Step one, first some single lithium battery are composed in series lithium battery group, series connection is every from described lithium battery group Between two section cells, extraction voltage detection signal is delivered to four and is selected an analog switch input;
Step 2, select an analog switch Enable Pin by controlling described four, the different detection signals of gating, will by subtractor Each detection signal difference sends into A/D change-over circuit;
Step 3, by main control chip MCU according to the A/D conversion value reading, complete this periodic voltage detection;
By making the low accumulator battery electric discharge to voltage of the high accumulator battery of voltage after the completion of step 4, detection, realize battery Balanced management;
Step 5, carry out next round detection, equalization cycle.
Further, in described step one, corresponding for the detection signal of each voltage two four are selected an analog switch input End, by sending different instruction, the lithium battery group on-Line Voltage value in the case of detection various combination to Enable Pin.
Further, in described step 2, after four select an analog switch selected input signal, by two groups of signal input subtractions Device, A/D change-over circuit is changed to two groups of signal differences, because now input reference signal is less and limited, maximum It is cell voltage, compared with conventional A/D change-over circuit mode, at least more than one times of A/D conversion resolution can be improved.
Further, in described step 4, in each detection cycle, the ceiling voltage set of cells that a upper cycle detection is arrived To minimum voltage battery power discharge, second highest set of cells is put a little to secondary low set of cells, the like carry out Balance route.
Further, in described step 5, during detection, the period 1 first detects magnitude of voltage between four section cells, enters Balance route between row cell, magnitude of voltage between second round detection three section cell, carry out battery balanced control;The Three cycles carried out Balance route between two batteries;Period 4 carries out Balance route between single battery.
With respect to prior art, beneficial effects of the present invention are:The present invention can be accurate using less A/D change-over circuit Really on-line checking cell state, and adopt efficient balance policy, carry out Balance route between cell.
Brief description
Fig. 1 is monomer battery voltage signals collecting schematic diagram of the present invention;
Fig. 2 is on-line checking principle schematic of the present invention;
Fig. 3 is Balance route flow chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention program,
As shown in Fig. 2 a kind of online lithium battery group equalization methods, comprise the steps:
Step one, first some single lithium battery are composed in series lithium battery group, series connection is every from described lithium battery group Between two section cells, extraction voltage detection signal 1 is delivered to four and is selected an analog switch 2 input;Detection letter by each voltage Number correspondence two four selects an analog switch 2 input, by Enable Pin is sent with different instruction, in the case of detection various combination Lithium battery group on-Line Voltage value.
Step 2, select an analog switch 2 Enable Pin by controlling described four, the different detection signals of gating, by subtractor 3 Each detection signal difference is sent into A/D change-over circuit 4;After four select an analog switch 2 selected input signal, by two groups of signal inputs Subtractor 3, A/D change-over circuit 4 is changed to two groups of signal differences, because now input reference signal is less, is easy to select The higher A/D conversion chip of precision.
Step 3, by main control chip MCU5 according to the A/D conversion value reading, complete this periodic voltage detection;
By making the low accumulator battery electric discharge to voltage of the high accumulator battery of voltage after the completion of step 4, detection, realize battery Balanced management;In each detection cycle, the ceiling voltage set of cells that a upper cycle detection is arrived to minimum voltage battery power discharge, Second highest set of cells is put a little to secondary low set of cells, the like carry out Balance route.
Step 5, carry out next round detection, detection when, the period 1 first detects magnitude of voltage between four section cells, enters Balance route between row cell, magnitude of voltage between second round detection three section cell, carry out battery balanced control;The Three cycles carried out Balance route between two batteries;Period 4 carries out Balance route between single battery.
Fig. 1 is monomer battery voltage signals collecting schematic diagram of the present invention.The lithium battery group being composed in series by cell, be Each cell positive pole is connected with another cell negative pole.Connect place's extraction voltage detection signal, by each At cell negative pole and positive pole two voltage detection signal difference, you can know this cell on-Line Voltage value.In the same manner may be used The set of cells on-Line Voltage value that arbitrarily a few section cell of detection is composed in series.
Fig. 2 is on-line checking principle schematic of the present invention.Wherein, four an analog switch Enable Pin is selected to control truth table as follows Shown in table:
S0 S1 OUTA
0 0 A0
0 1 A1
1 0 A2
1 1 A3
If S0=0, S1=0, then OUTA output A0 signal, that is, gate Cn signal, and S2=0, S3=0, then OUTB output B0 signal, that is, gate Cn+1 signal, OUTA and OUTB signal sends into subtractor, and now subtractor output analog voltage signal value is For the battery on-Line Voltage between Cn and Cn+1 sampled point.If now S0=0, S1=0, then OUTA output A0 signal, that is, gate Cn signal, and S2=1, S3=1, then OUTB output B3 signal, that is, gate Cn+4 signal, OUTA and OUTB signal sends into subtraction Device, the four section cells that now subtractor exports between analog voltage signal value as Cn and Cn+4 sampled point are composed in series Set of cells on-Line Voltage.Change feeding single-chip microcomputer from the analog voltage signal of subtractor output through A/D and carry out digital independent.Pass through This method carries out detecting cell, two section series batteries, three section series batteries, the online electricity of four section series batteries Pressure.
As shown in figure 3, a kind of operation principle of online lithium battery group equalization methods of the present invention is:A kind of online lithium electricity Pond group equalization methods carry out equilibrium treatment by four cycles.Period 1 first detects four section single lithium battery on-Line Voltage, then Judge whether whether each group cell voltage is equal, if unequal, judge voltage highest set of cells and the minimum battery of voltage Group, makes voltage highest set of cells to the minimum battery power discharge of voltage, carries out equilibrium treatment.If each group cell voltage is equal, explanation The battery pack balancing of four one group of sections, need not be processed, and start second round detection, and that is, three one group of cells of section are detected, so Post-equalization is processed.Carry out detection equilibrium treatment and the period 4 single-unit monomer electricity of period 3 two one group of cell of section successively Equilibrium treatment is just detected in pond.Period 4 restarts the period 1 after terminating again, circulates successively.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any The change or replacement expected without creative work, all should be included within the scope of the present invention.Therefore, the present invention Protection domain should be defined by the protection domain that claims are limited.

Claims (3)

1. a kind of online lithium battery group equalization methods it is characterised in that:Comprise the steps:
Step one, first some single lithium battery are composed in series lithium battery group, every two sections of series connection from described lithium battery group Between cell, extraction voltage detection signal is delivered to four and is selected an analog switch input;
Step 2, select an analog switch Enable Pin by controlling described four, the different detection signals of gating, by subtractor by each inspection Survey signal difference and send into A/D change-over circuit;
Step 3, by main control chip MCU according to the A/D conversion value reading, complete this periodic voltage detection;
By making the lithium battery group electric discharge low to voltage of the high lithium battery group of voltage after the completion of step 4, detection, realize battery equal Weighing apparatus management;
Step 5, carry out next round detection, equalization cycle, specially:During detection, the period 1 is with four section cells for one Group, the magnitude of voltage of the set of cells of first detection four section cell composition, carry out the Balance route between each set of cells;Second round With three section cells for one group, the magnitude of voltage of the set of cells of detection three section cell composition, carry out between each set of cells Balance route;Period 3, detection two saved the magnitude of voltage of the set of cells of cell composition, enters with two section cells for one group Balance route between each set of cells of row;Period 4, with single-unit cell for one group, detects the magnitude of voltage of each set of cells, Carry out the Balance route between each set of cells.
2. a kind of online lithium battery group equalization methods according to claim 1 it is characterised in that:In described step 2, four After selecting an analog switch selected input signal, by two groups of signal input subtractors, A/D change-over circuit is carried out to two groups of signal differences Conversion, now input reference signal is less and limited, and maximum is cell voltage.
3. a kind of online lithium battery group equalization methods according to claim 1 it is characterised in that:In described step 4, In each detection cycle, to minimum voltage battery power discharge, second highest set of cells is to secondary low electricity for the ceiling voltage set of cells detecting Chi Zufang point, the like carry out Balance route.
CN201410343229.5A 2014-07-17 2014-07-17 On-line lithium battery pack equilibrium method Active CN104135048B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8461806B2 (en) * 2007-10-15 2013-06-11 O2Micro Inc Systems and methods for cell balancing
CN101471577B (en) * 2007-12-29 2011-06-15 比亚迪股份有限公司 Voltage balance circuit for double-burl chargeable battery
CN101498749B (en) * 2008-02-01 2012-06-20 凯迈(洛阳)测控有限公司 Accurate resistor measuring apparatus and method thereof
CN101692508A (en) * 2009-09-25 2010-04-07 北京北方专用车新技术发展有限公司 Active equalization method for lithium ion battery pack in resting state
CN102832653B (en) * 2011-12-29 2015-09-30 中航锂电(洛阳)有限公司 The how monomer series-connected active equalizer circuit of cell pack of one
CN103326439B (en) * 2013-06-28 2016-11-02 安科智慧城市技术(中国)有限公司 The equalizing circuit of set of cells and method
CN103296731B (en) * 2013-07-04 2014-12-10 山东大学 Zero current switch active equalization circuit of power batteries and implementation method

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