CN110323803B - Multiphase interleaved converter suitable for series lithium ion battery pack - Google Patents
Multiphase interleaved converter suitable for series lithium ion battery pack Download PDFInfo
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- CN110323803B CN110323803B CN201910544843.0A CN201910544843A CN110323803B CN 110323803 B CN110323803 B CN 110323803B CN 201910544843 A CN201910544843 A CN 201910544843A CN 110323803 B CN110323803 B CN 110323803B
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- 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
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- 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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Abstract
A multiphase interleaved converter suitable for series lithium ion battery pack comprises n cells; n-1 equalization units EC; the cathode of a battery Bi (i =1,2, \8230;, n) is connected with the anode of a battery Bi +1 to form a series battery pack with n sections connected end to end; the drain of the upper switching tube SHi (i =1,2, \ 8230;, n) in the equalizing unit ECi (i =1,2, \ 8230;, n) is connected to the positive bus bar of the series battery pack, the source of the lower switching tube BLi (i =1,2, \ 8230;, n) is connected to the negative bus bar of the series battery pack, the source of the upper switching tube SHi (i =1,2, \8230;, n), the drain of the switching tube SLi (i =1,2, \ 8230;, n) is connected to one end of the inductance Li (i =1,2, \ 8230;, n), and the other end of the inductance Li (i =1,2, \ 8230;, n) is connected to the negative terminal of the cell Bi (i =1,2, \ 8230;, n) in the series battery pack. The multiphase interleaved converter suitable for the series lithium ion battery pack can avoid repeated charging and discharging of the battery to realize rapid equalization and reduce energy loss at the same time.
Description
Technical Field
The invention relates to a circuit capable of realizing rapid electric quantity equalization of a series lithium ion battery pack, in particular to a multiphase interleaved converter suitable for the series lithium ion battery pack.
Background
At present, lithium ion batteries are widely applied to the fields of electric automobiles, new energy power generation, standby power supplies and the like. The lithium ion battery has the remarkable advantages of high power density, no memory, less self-discharge, lighter weight and the like. The voltage and the power storage capacity of the single lithium ion battery are low, and a plurality of battery packs are generally formed in a series connection mode to obtain the required voltage and capacity. Due to the inconsistency of chemical properties or other characteristics of different lithium ions, the charging and discharging of the single batteries in the series branch are inconsistent, the phenomenon of over-charging or over-discharging of part of the single batteries occurs, and the battery pack can be excessively thermally ignited and even explode in severe cases. Therefore, the problem of the electric quantity balance of the series lithium ion battery pack is a key problem related to the safe, stable and efficient operation of the battery.
Disclosure of Invention
In order to solve the problem of inconsistent charge and discharge performance of a single lithium ion battery in a series lithium ion battery pack, the invention provides the multiphase interleaved converter suitable for the series lithium ion battery pack, which can avoid repeated charge and discharge of the battery to realize rapid equalization and reduce energy loss at the same time.
The technical scheme adopted by the invention is as follows:
a multiphase interleaved converter suitable for use in a series lithium ion battery pack, comprising:
n batteries; n-1 equalization units EC;
battery B i (i =1,2, \8230;, n) and a battery B i+1 The positive electrodes of the battery packs are connected to form n series battery packs connected end to end;
equalizing unit EC i (i =1,2, \8230;, n) of the upper switching tube S Hi (i =1,2, \8230;, n) has its drain connected to the positive bus bar of the series cell stack, and a lower switching tube B Li (i =1,2, \8230;, n) is connected to the negative bus of the series cell, and the upper switching tube S Hi (i =1,2, \8230;, n) source, switching tube S Li (i =1,2, \8230;, n) and an inductance L i (i =1,2, \8230;, n) are connected at one end, and an inductance L i The other end of (i =1,2, \8230;, n) is connected to cell B in the series battery i (i =1,2, \8230;, n) cathode and B i+1 (i =1,2, \8230;, n) in the positive electrode line.
The equalizing unit circuit EC includes: are respectively connected in reverse parallel with diodes D H Diode D L Switch tube S H MOS transistor S L Inductor L, two lithium ion batteries B H 、B L (ii) a The connection relation of the equalizing unit circuit EC is as follows:
battery B L And battery B H Is connected with the negative electrode ofClosing pipe S H Is connected to the switching tube B H Positive electrode of (2), switching tube S L Is connected to the switch tube B L Negative electrode of (2), switching tube S H Source electrode, S L The drain electrode of the capacitor is connected with one end of an inductor L, the other end of the inductor L and a battery B H Negative electrode of (1), B L Is connected with the positive pole of the battery.
When the multiphase interleaved converter works, starting from the overall situation of the circuit, the switch state is matrixed, the battery equalization control is optimized, the equalization time is shortened, and the repeated charging and discharging of the battery in the equalization process are avoided, specifically:
firstly, obtaining the voltage of each single battery in the battery pack through a peripheral detection circuit, and calculating the voltage of each balanced single battery, namely, calculating the average value of the voltages of all single batteries in the current battery pack;
then, the difference value between the voltage of each current single battery and the voltage of each balanced single battery forms a matrix Q with n rows and 1 columns △ In one working cycle, each equalization unit EC is assumed i Has a working time of t i And specifies when t i >When 0 is equal to EC i Middle upper switch tube S Hi Conduction, t i <Time 0 EC i In which a lower switching tube S is shown Li Conducting, thus obtaining a matrix T with n rows and 1 column. The ratio of the energy changes of each cell then constitutes a matrix Δ q when the equalizing unit is operated during a switching cycle n . With equalizing unit EC 1 For example, at matrix Δ q n Wherein q (1, 1) = -1 denotes a slave battery B 1 To the inductance L 1 One unit energy is transferred, q (2, 1) = q (3, 1) = \8230 = q (n, 1) = 1/(n-1) denotes slave battery B 2 To battery B n Absorbs 1/(n-1) per unit energy. Also, at matrix Δ q n Wherein q (2, 1) = q = -1/2 represents battery B 1 And battery B 2 Transfer half a unit of energy to the inductor L 2 Q (3, 2) = q (4, 2) = 8230 = q (n, 2) = 1/(n-2) represents slave battery B 3 To battery B n Absorb 1/(n-2) per unit energy. By analogy, a matrix delta q with n rows (n-1) and columns can be obtained n 。
Finally, byObtaining a matrix equation delta q by using an energy conservation law n T＝Q △ And in the peripheral control circuit, the matrix equation is quickly solved by a special information processing unit to obtain the time required by each equalizing unit to work in a working period, namely, the effect of quickly equalizing the electric quantity of the battery pack is achieved.
The invention discloses a multiphase interleaved converter suitable for series lithium ion battery packs, which has the following technical effects:
1: from the overall situation of the circuit, the switch state is matrixed, the battery equalization control is optimized, the equalization time is shortened, and the repeated charging and discharging of the battery in the equalization process are avoided.
2: the invention provides an N-phase interleaved equalization circuit topology based on a buck-boost converter. The converter has the advantages that the structure is simple, the expansion is easy, and each balancing sub-circuit works independently, so that the converter can work synchronously, and the time consumption of the balancing process is reduced.
3: the matrix processing is carried out on the switch state in the control, so that the problem that the battery is repeatedly charged and discharged while being rapidly balanced is avoided, meanwhile, the damage caused by the operation of an equalizing circuit is reduced, and the service life of the battery is prolonged.
Drawings
Fig. 1 is a circuit topology diagram of a converter of the present invention.
Fig. 2 is a circuit diagram of an equalizing unit of the converter of the present invention.
FIG. 3 (a) shows a battery B i Is higher than that of the other batteries with the same electric quantity B i The first energy transfer diagram;
FIG. 3 (B) shows a battery B i Is higher than the other batteries with the same electric quantity B i Energy transfer diagram ii.
FIG. 4 is a schematic diagram of the peripheral detection circuit and control circuit of the present invention.
Detailed Description
A multiphase interleaved converter suitable for series lithium ion battery packs is composed of n-1 equalizing unit circuits and n batteries as shown in figure 1. As shown in FIG. 1, n batteries connected in series constitute a Battery Pack of series batteries from top to bottomThe lower numbers are respectively B 1 、B 2 、…、B n . n-1 equalizing unit circuits EC, numbered in sequence 1 、EC 2 、…、EC n-1 . The specific equalizing unit circuit EC is shown in FIG. 2, and comprises two anti-parallel diodes D H 、D L MOS transistor S H 、S L And an inductor L and two batteries B H 、B L And (4) forming.
The specific connections of the equalization unit circuit are as follows: two batteries B H 、B L In series (cell B) L Positive electrode of (1) and battery B H Is connected to the negative pole), a switching tube S H Is connected to B H Positive electrode of (2), switching tube S L Is connected to B L Negative electrode of (2), switching tube S H Source electrode, S L Is connected with one end of an inductor L, and the other end of the inductor L is connected with a battery B H Negative electrode of (1), B L The positive electrodes of the two electrodes are connected.
The specific circuit connections of the multiphase interleaved converter are as follows: equalizing unit circuit EC i (i =1,2, \8230;, n) of the upper switching tube S Hi (i =1,2, \8230;, n) is connected to the positive bus line of the series cell stack, and the lower switching tube S Li The source electrode of (i =1,2, \8230;, n) is connected to the negative bus bar of the series cell stack, and the upper switching tube S Hi (i =1,2, \8230;, n) source, switching tube S Li (i =1,2, \8230;, n) and an inductance L i (i =1,2, \8230;, n) are connected at one end, and an inductance L i The other end of (i =1,2, \8230;, n) is connected to cell B in the series battery i (i =1,2, \8230;, n) cathode and B i+1 (i =1,2, \8230;, n) in the positive electrode line. Each balancing unit circuit balances the electric quantity of the battery packs on two sides of the inductor.
1: the working principle of the equalizing unit circuit is as follows:
for two batteries B with different electric quantities H 、B L The equalization unit circuit is configured as shown in fig. 2.
When battery B H Is higher than that of battery B L While the upper switch tube S is conducted H Then battery B H Will pass through the inductor L and the switchPipe S H The circuit being constructed to discharge, i.e. current from, battery B H The positive electrode of the switch tube S H An inductor L for storing energy and returning it to battery B H Then the switching tube S is disconnected H The current of the inductor L cannot suddenly change, so that the inductor L and the battery B are connected L And a switching tube S L Antiparallel diode D L Formed loop to battery B L Charging is carried out, namely, the current does not change in the direction of the inductor L and reaches the battery B after passing through the inductor L L From the positive electrode of battery B L Flows out through the diode D L And an inductor L is flowed back.
When battery B H Is lower than that of battery B L While turning on the lower switch tube S L Then battery B L Will pass through the inductor L and the switch tube S H The circuit is configured to discharge, i.e. current flows from, battery B L The positive electrode of the switch tube S L An inductor L for storing energy and returning it to battery B L Then the switching tube S is switched off L The current of the inductor L cannot suddenly change, so that the inductor L and the battery B are connected H And a switching tube S H Antiparallel diode D H Formed loop to battery B H Charging is carried out, namely, the current does not change in the direction of the inductor L and reaches the diode D after passing through the inductor L H And then flows to battery B H From the positive pole of (B) H Flows back to the inductor L. This achieves the theoretical lossless transfer of energy from a high-capacity battery to a low-capacity battery. The on-off and the duty ratio of the switching tube can be realized by a peripheral detection circuit and a peripheral control circuit.
The peripheral detection circuit is a circuit for collecting the voltage of each single battery in the battery pack, and an integrated chip detection method can be adopted for collecting the voltage of each single battery. The invention uses the LTC6803 voltage acquisition chip produced by the Linear formula to acquire each single battery B i Then the collected data is sent to a peripheral control circuit processing unit through a digital-to-analog converter A/DSTM32F103 series chips. After the chip is programmed, the voltage information of all the single batteries in the battery pack is acquired and then processed, such as an average value is obtained, and the voltage of which single batteries is higher than the average value and the voltage of which single batteries is lower than the average value is judged, so that corresponding PWM waves are output on corresponding control pins to control the on-off and duty ratio of the switching tube. The information processing unit in the peripheral control circuit adopts a singlechip STM32F103RBT6 manufactured by Italian Semiconductor (ST).
2: in a series battery pack formed by connecting n batteries in series, the working principle of the multiphase interleaved converter is as follows under the condition that the electric quantity of only one battery is abnormal:
(1) the method comprises the following steps When the abnormal cell is located at both ends of the battery pack, as shown in fig. 1, the abnormal cell is a cell B 1 Or battery B n 。
Suppose battery B 1 Is an abnormal battery, and the electric quantity of the battery is higher than the rest n-1 batteries with the same electric quantity, and the switch tube S is conducted H1 Then battery B 1 Will pass through and inductance L 1 Switch tube S H1 Form a loop discharge, i.e. current flows from battery B 1 Starting from the positive pole, via a switching tube S H1 An inductor L 1 Make the inductance L 1 Stored energy and then flows back to the battery B 1 Then the switching tube S is disconnected H1 Since the inductor current is not abruptly changed, the inductor L is made to have a short inductance 1 And the remainder is from B 2 To B n Series n-1 batteries and switch tube S L1 Antiparallel diode D L1 Formed a loop for the rest of the slave B 2 To B n Charging n-1 batteries in series, i.e. with current in inductor L 1 Is unchanged in direction, passes through the inductor L 1 Rear to battery B 2 Into secondary battery B 2 To battery B n N-1 batteries connected in series, and secondary battery B n Flows out through the diode D L1 Return inductor L 1 。
Now assume abnormal battery B 1 The electric quantity of the switch tube S is conducted when the electric quantity of the switch tube S is lower than that of the rest n-1 batteries with the same electric quantity L1 Then from B 2 To B n Connected in seriesN-1 cell pass-through and inductance L 1 And a switch tube S L1 Form a loop discharge, i.e. current flows from battery B 2 Starting from the positive pole, via a switching tube S L1 Inductor L 1 Let L be 1 Stored energy and then flows back to the battery B n Then the switching tube S is disconnected L1 Since the inductor current cannot change abruptly, the inductor L 1 And battery B 1 And a switching tube S H1 Antiparallel diode D H1 Formed loop, for the rest slave B 2 To B n Charging n-1 batteries in series, i.e. with current at L 1 Is unchanged in direction, passes through L 1 Rear-reaching diode D H1 To battery B 1 From the positive pole of (B) 1 Negative pole of the inductor L 1 . Since the circuit is symmetrical, the abnormal cell is B n The operating principle of the multiphase interleaved converter in the case of (2) can be similarly derived.
(2) The method comprises the following steps When the abnormal cell is located inside the battery pack, as shown in fig. 3 (a), 3 (B), the abnormal cell is B i (i can take the value of 2,3, \8230;, n-1). Now suppose battery B i If the electricity quantity is higher than the rest n-1 batteries with the same electricity quantity, the battery B is needed i The excess energy is transferred to other cells in the battery pack.
First-conducting switch tube S L(i-1) As shown in FIG. 3 (a), the slave battery B i To battery B n The n-i +1 batteries connected in series will pass through the sum inductor L (i-1) Switch tube S L(i-1) The circuit being constructed to discharge, i.e. current from, battery B i Starting from the starting point, through a switch tube S L(i-1) An inductor L (i-1) So that L is (i-1) Store energy and then turn off S L(i-1) Since the inductor current cannot change abruptly, the inductor L (i-1) And from B 1 To B (i-1) Series connected i-1 batteries and switch tube S H(i-1) Antiparallel diode D H(i-1) Formed loop, to slave B 2 To B n Charging n-1 batteries in series, i.e. with current at L (i-1) Is unchanged in direction, passes through L (i-1) Rear-reaching diode D H(i-1) To battery B 1 Positive electrode of (2), reflowIn from B 1 To B (i-1) I-1 batteries connected in series, and secondary battery B (i-1) Negative pole reflow inductance L (i-1) 。
Then the switch tube S is turned on Hi As shown in FIG. 3 (B), the slave battery B 1 To battery B i The i batteries connected in series will pass through and the inductor L i Switch tube S Hi The circuit being constructed to discharge, i.e. current from, battery B 1 Starting from the positive pole, via the switching tube S Hi An inductor L i So that L is i Stored energy and then flows back to the battery B i Then turn off S Hi Since the inductor current cannot change abruptly, the inductor L i And from B (i+1) To B n Series n-i battery and switch tube S Li Antiparallel diode D Li Formed loop pair B (i+1) To B n Charging n-i batteries in series, i.e. with current at L i Is unchanged in direction of (1), passes through L i Rear to battery B (i+1) Into the secondary electrode of B (i+1) To B n Series connected n-i batteries, and secondary battery B n Flows out through the diode D Li Return inductor L (i-1) . Combining these two states, belonging to B i The excess energy can be transferred to the remaining battery.
The concrete description is as follows:
suppose B i And the average value of the battery pack is
Under state stateI, each battery is driven from B i To B n The released energy is set to 1 Temporarily stored in the inductor L (i-1) Then released to battery B 1 To battery B (i-1) (ii) a In state stateII, each cell is driven from B 1 To B i Is set to Δ ε 2 Temporarily stored in the inductor L i Then released to battery B (i+1) To B n . State I and state II may operate simultaneously. The individual on/off switching during equalization is shown in table 1. During a switching period, electricityThe energy absorbed and released is equal, so the following equation can be derived:
solving a simultaneous equation set to obtain:
solved to delta epsilon 1 、△ε 2 The method is used for the peripheral control circuit to calculate the on-off and the duty ratio of the switching tube, namely, the peripheral control circuit can realize the control balance of the electric quantity of the battery pack.
Table 1: on/off state switching of each switching tube in balancing process
3: under the condition that the electric quantity of each battery in the n batteries is random, the working principle of the multiphase converter is as follows:
firstly, the electric quantity of a battery pack formed by n batteries connected in series is detected by a peripheral detection circuit, and the electric quantity of each battery is obtained as Q Bi Defining the electric quantity of the battery after equalization as
Then the method has the formula (6),
assuming each equalization unit EC i Has a working time of t i And specifies when t i >When 0 is equal to EC i Middle upper switch tube S Hi On, t i <Time 0 EC i In which a lower switching tube S is shown Li Conducting to obtain a matrix T of the working time of n-1 equalizing units, namely an equation (7),
T＝[t 1 ,t 2 ,…，t n-1 ] T (7)
from the current energy Q of each battery Bi And the energy of each battery after equalization
Form a matrix Q △ To obtain the compound of formula (8):
when the equalizing unit is operated during a switching cycle, the ratio of the energy changes of each cell forms a matrix Deltaq n 。
With equalizing unit EC 1 For example, at matrix Δ q n Wherein q (1, 1) = -1 denotes a slave battery B 1 To the inductance L 1 One unit energy is transferred, q (2, 1) = q (3, 1) = \8230 = q (n, 1) = 1/(n-1) denotes slave battery B 2 To battery B n Absorbs 1/(n-1) per unit energy. Likewise, at matrix Δ q n Wherein q (2, 1) = q = -1/2 represents battery B 1 And battery B 2 Transfer half a unit of energy to the inductor L 2 Q (3, 2) = q (4, 2) = 8230 = q (n, 2) = 1/(n-2) denotes slave battery B 3 To battery B n Absorb 1/(n-2) per unit energy. By analogy, a matrix delta q with n rows (n-1) and columns can be obtained n Thus, formula (9) is obtained.
Equation (10) follows the working principle and the law of conservation of energy of section 2 above.
△q n T＝Q △ (10)
According to the formula (10), the on-time of the switch matrix can be obtained, and the peripheral control circuit can effectively control the multiphase interleaved converter, so that the electric quantity of the battery pack can be quickly balanced.
Claims (2)
1. A multiphase interleaved converter adapted for use in a series lithium ion battery pack, comprising:
n batteries; n-1 equalizing units EC;
battery B i (i =1,2, \8230;, n) and a battery B i+1 The positive electrodes of the battery packs are connected to form n series battery packs connected end to end;
equalizing unit EC i (i =1,2, \8230;, n-1) upper switch tube S Hi (i =1,2, \8230;, n-1) is connected to the positive bus line of the series battery, and the lower switching tube S Li The source electrode of (i =1,2, \8230;, n-1) is connected to the negative bus bar of the series battery pack, and the upper switching tube S Hi (i =1,2, \8230;, n-1) source, lower switching tube S Li (i =1,2, \8230;, n-1) and the inductance L i (i =1,2, \8230;, n-1) are connected at one end, and an inductance L is set i The other end of (i =1,2, \8230;, n-1) is connected to cell B in the series battery i (i =1,2, \8230;, n) cathode and B i+1 (i =1,2, \8230;, n) in the positive electrode line;
the method for equalizing the electric quantity of the series lithium ion battery pack based on the multiphase interleaved converter comprises the following steps of:
firstly, obtaining the voltage of each single battery in the battery pack through a peripheral detection circuit, and calculating the voltage of each balanced single battery, namely, solving the average value of the voltages of all single batteries in the current battery pack;
then, each list is currentlyAfter the voltages of the body batteries are equalized, the difference value of the voltages of each single battery forms a matrix Q with n rows and 1 columns Δ In one working cycle, each equalizing unit EC is set i Has a working time of t i And specifies when t i >When 0 is equal to EC i Middle upper switch tube S Hi On, t i <Time 0 EC i In which a lower switching tube S is shown Li Conducting, thereby obtaining a matrix T with n rows and 1 column; the ratio of the energy changes of each cell then constitutes the matrix Δ q when the equalizing unit is operated during one switching cycle n ；
In an equalizing unit EC 1 In the matrix Δ q n Wherein q (1, 1) = -1 denotes the slave battery B 1 To the inductance L 1 One unit energy is transferred, q (2, 1) = q (3, 1) = \8230 = q (n, 1) = 1/(n-1) denotes slave battery B 2 To battery B n Absorb 1/(n-1) per unit energy; also, at matrix Δ q n Wherein q (2, 1) = q = -1/2 represents battery B 1 And battery B 2 Transfer half a unit of energy to the inductor L 2 Q (3, 2) = q (4, 2) = 8230 = q (n, 2) = 1/(n-2) denotes slave battery B 3 To battery B n Absorb 1/(n-2) of unit energy, and so on to obtain a matrix Deltaq of n rows (n-1) and columns n ；
Finally, a matrix equation delta q is obtained through the law of conservation of energy n T＝Q Δ And solving the matrix equation to obtain the time required by each balancing unit to work in a working period, namely achieving the effect of quickly balancing the electric quantity of the battery pack.
2. The multiphase interleaved converter as set forth in claim 1, wherein:
the equalizing unit circuit EC includes: inverse parallel connected with diode D H Switch tube S H In inverse parallel with a diode D L MOS tube S L Inductor L, two lithium ion batteries B H 、B L (ii) a The connection relation of the equalizing unit circuit EC is as follows:
battery B L Positive electrode of (1) and battery B H Is connected with the negative electrode ofClosing pipe S H Is connected to the switch tube B H Positive electrode of (2), switching tube S L Is connected to the switch tube B L Negative electrode of (2), switching tube S H Source electrode, S L The drain electrode of the capacitor is connected with one end of an inductor L, the other end of the inductor L and a battery B H Negative electrode of (1), B L The positive electrodes of the two electrodes are connected.
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| US6150795A (en) * | 1999-11-05 | 2000-11-21 | Power Designers, Llc | Modular battery charge equalizers and method of control |
| CN106100072B (en) * | 2016-08-17 | 2019-11-08 | 三峡大学 | A kind of low loss series Li-ion batteries piles electric quantity balancing circuit |
| CN108429308B (en) * | 2018-03-09 | 2023-08-22 | 西南交通大学 | Single-capacitor centralized equalizer topology and equalizing method thereof |
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