CN112542871B - Series battery pack hybrid equalization circuit and control method and device thereof - Google Patents
Series battery pack hybrid equalization circuit and control method and device thereof Download PDFInfo
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- CN112542871B CN112542871B CN202011405294.8A CN202011405294A CN112542871B CN 112542871 B CN112542871 B CN 112542871B CN 202011405294 A CN202011405294 A CN 202011405294A CN 112542871 B CN112542871 B CN 112542871B
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The invention relates to a series battery pack hybrid equalizing circuit and a control method and a device thereof.N battery packs connected in series in sequence are adopted, a first switch device is connected between two adjacent battery packs, and two adjacent battery packs form an equalizing unit; the high electric energy of the battery monomer, the inductance device and the capacitance device in each battery pack flows to the battery monomer with low electric energy, the energy transfer between any battery monomer and the battery monomer is realized in the inductance device and the capacitance device through the connection or disconnection of the first switch device and the second switch device, the electric quantity of the series battery pack hybrid equalizing circuit can be directly transferred to any battery monomer with lower voltage from any battery monomer with higher voltage, the equalizing speed of the battery pack is improved, the using quantity of the switch devices is reduced at the same time, and the problem that the equalizing speed between battery monomers of the equalizing topological structure of the automatic switch capacitor is slower than that of the battery equalizing topological structure based on the switch capacitor is solved.
Description
Technical Field
The invention relates to the technical field of equalization circuits, in particular to a series battery pack hybrid equalization circuit and a control method and device thereof.
Background
The battery cannot meet the requirement of high-power grade load in practical application due to the limitation of energy and capacity of each single battery, so the batteries are generally connected in series. However, since various parameters such as initial capacity, equivalent series internal resistance, temperature, voltage, leakage current and the like of each single battery are different in the manufacturing process, the charge and discharge of each single battery of the series battery pack are inconsistent due to the difference of the battery parameters in the using process, and the charge and discharge are specifically represented as overcharge or overdischarge of a certain single battery or certain batteries. For the whole series battery pack, the effective capacity of the battery pack is determined by the monomers with the weakest capacity, and the whole battery pack is in the abnormal charge-discharge state for a long time, so that the parameter inconsistency among the battery monomers is aggravated, the capacity of the whole series battery pack is reduced, and the battery pack cannot normally work, so that the safety performance of the battery pack is reduced, and the service life of the battery pack is greatly reduced. For the series energy storage system, imbalance among the single bodies can seriously affect the normal operation of the whole series battery pack, so that the balance control of the single bodies of the series battery pack is necessary to realize the wide application of the large-capacity series battery pack.
At present, a high-efficiency battery balancing topological structure is adopted in a battery balancing process to realize the balancing of a battery pack, and redundant energy is mainly transferred to a monomer with insufficient energy, so that the parameter inconsistency among battery monomers is improved, the overcharge and overdischarge of the battery are prevented, the available capacity of the battery pack is ensured, and the cycle life and the safety performance of the battery are improved. Specifically, as shown in fig. 1, n-1 switched capacitors and 2n switching tubes are required for a series battery pack composed of n battery cells. The battery equalization topological structure based on the switched capacitor utilizes the capacitor as an energy storage element, so that energy is transferred between two adjacent battery monomers, and the battery equalization topological structure works according to a driving signal of a figure 2, and works according to B1As a source battery, B2For the purpose of taking a target battery as an example, the working mode analysis of the switched capacitor-based battery equalization topological structure is as follows: first, switch on switch tube S11、S21Capacitor C1And battery B1Parallel connected, capacitor C1Charging or discharging to make its voltage and battery B1The voltages are equal; second, turn off switch tube S11、S21Turn on the switch tube S12、S22Capacitor C1And battery B2Parallel connected, capacitor C1Charging or discharging to make its voltage and battery B2Is equal to realize battery B1And B2Voltage equalization. The battery balancing topological structure based on the switched capacitor can realize accurate balancing of the voltage of the single batteries, does not need a sensor or closed-loop control, does not have energy consumption elements, is high in energy conversion efficiency, but is small in balancing current and long in balancing time when the batteries are in an unbalanced state and the voltage difference between the single batteries is small and is far away from each other, so that the requirement of the energy storage power supply on the rapidity of voltage balancing is difficult to meet.
The existing battery equalization structure aims to solve the problem that an equalization circuit based on a switched capacitor can only realize the energy between adjacent battery monomersThe problem of transmission is solved by adopting an automatic switched capacitor balancing topological structure as shown in fig. 3, wherein the automatic switched capacitor balancing topological structure mainly aims at a series battery pack consisting of n battery monomers and needs n switched capacitors and 4n-3 switching tubes, alpha1、α2Are complementary signals with a fixed duty cycle. With B2As a source battery, B1For example, the working mode analysis of the balanced topology structure of the automatic switched capacitor is as follows: as shown in FIG. 4 (a), the switching tube Sa1、Sa2And Sb2Opening, Sc2And Sd2Off, phase alpha1There are two modes of operation, one is that when the voltage across the switched capacitor is higher than the initial voltage of the battery cell, the capacitor will discharge to the corresponding battery. Another way of working is that the battery will charge the capacitor when the voltage across the switched capacitor is lower than the initial voltage of the battery cell. As shown in fig. 4 (b), the switching tube Sa1、Sa2And Sb2Off, Sc2And Sd2On, capacitor C1And C2Connected in parallel, energy flows from the higher voltage capacitor to the lower voltage capacitor. The energy of the automatic switch capacitor balancing topological structure can be directly transmitted to any battery monomer with lower voltage from any battery monomer with higher voltage, but the speed of the automatic switch capacitor balancing topological structure is lower than that of a balancing topology based on a switch capacitor when the automatic switch capacitor balancing topological structure is applied to balancing of only two battery monomers, and a large number of switch tubes are used in the structure.
Disclosure of Invention
The embodiment of the invention provides a series battery pack hybrid equalizing circuit and a control method and device thereof, which are used for solving the technical problem that the equalizing speed between battery monomers of an automatic switched capacitor equalizing topological structure is slower than that of a battery equalizing topological structure based on a switched capacitor.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a series battery pack hybrid equalizing circuit comprises n battery packs which are sequentially connected in series, wherein n is a positive integer, a first switch device is connected between every two adjacent battery packs, and the two adjacent battery packs form an equalizing unit;
each battery pack comprises two battery monomers, an inductance device, a capacitance device and 5 second switch devices, wherein the two battery monomers are marked as a first battery monomer and a second battery monomer, the 5 second switch devices are marked as a second switch device a, a second switch device b, a second switch device c, a second switch device d and a second switch device e, and the cathode of the capacitance device is connected with the second end of the second switch device e and is marked as a first node; the first ends of the first switching devices of two adjacent series-connected battery packs are connected with the first node of one series-connected battery pack, and the second ends of the first switching devices are connected with the first node of the other series-connected battery pack.
Preferably, the first battery cell is connected in series with the second battery cell, the positive electrode of the first battery cell is respectively connected with the first end of the second switching device a and the first end of the second switching device c, the second end of the second switching device c is respectively connected with the first end of the second switching device d and the positive electrode of the capacitor device, the negative electrode of the capacitor device is respectively connected with the second end of the second switching device e and the first end of the first switching device, the first end of the second switching device e is respectively connected with the second end of the second switching device d and the second end of the second switching device c adjacent to the second battery pack, the first end of the second switching device c adjacent to the second battery pack is respectively connected with the second end of the second switching device b and the negative electrode of the second battery cell, the first end of the inductance device is respectively connected with the cathode of the first battery cell and the anode of the second battery cell, and the second end of the inductance device is respectively connected with the second end of the second switch device a and the first end of the second switch device b.
Preferably, each of the battery packs further comprises a resistive device connected in series with the inductive device.
Preferably, the first switching device and the second switching device are both MOS transistors, the source of the MOS transistor is the second end of the first switching device and the second switching device, and the drain of the MOS transistor is the first end of the first switching device and the second switching device.
The invention also provides a control method of a series battery pack hybrid equalizing circuit, which is applied to the series battery pack hybrid equalizing circuit, and the control method comprises the following steps of marking two adjacent battery packs in an equalizing unit as a first battery pack and a second battery pack, wherein a first battery monomer of the first battery pack and a first battery monomer of the second battery pack are both high-voltage batteries, a second battery monomer of the first battery pack and a second battery monomer of the second battery pack are both low-voltage batteries, the total voltage of the two battery monomers of the first battery pack is greater than the voltage of a capacitance device of the first battery pack, and the total voltage of the two battery monomers of the second battery pack is less than the voltage of the capacitance device of the second battery pack, and comprises the following steps:
if the second switching devices a, c and e of the two battery packs are switched on, the first switching devices, b and d are switched off, the first battery monomers of the two battery packs take out electric energy, and the voltages at the two ends of the first battery monomers of the two battery packs are added to the two ends of the corresponding inductance device, namely the first battery monomers charge the inductance device; the electric energy of the two single batteries of the first battery pack flows to a capacitive device of the first battery pack to be stored, and the electric energy of the capacitive device of the second battery pack flows to the two single batteries of the second battery pack to be stored;
if the second switching device b, the second switching device d and the first switching device of the two battery packs are switched on, the second switching device a, the second switching device c and the second switching device e are switched off, the stored energy of the inductance device of each battery pack flows to the second battery monomer of the corresponding battery pack for storage, and when the voltage at two ends of the inductance device of each battery pack is greater than the voltage at two ends of the corresponding second battery monomer, the inductance device charges the corresponding second battery monomer; the capacitive devices of the first battery set are connected in parallel with the capacitive devices of the second battery set and energy will be transferred from the capacitive devices of high voltage into the capacitive devices of low voltage.
Preferably, the voltage between each single battery in the series battery hybrid equalizing circuit is equalized within 0.5 s.
The invention also provides a series battery pack hybrid equalizing device which comprises the series battery pack hybrid equalizing circuit.
According to the technical scheme, the embodiment of the invention has the following advantages:
the series battery pack hybrid equalizing circuit and the control method and the device thereof adopt n battery packs which are sequentially connected in series, a first switch device is connected between two adjacent battery packs, and two adjacent battery packs form an equalizing unit; the high electric energy of the battery monomer, the inductance device and the capacitance device in each battery pack flows to the battery monomer with low electric energy through the connection or disconnection of the first switch device and the second switch device, the energy transfer between any battery monomer and the battery monomer is realized in the inductance device and the capacitance device, the electric quantity of the series battery pack hybrid equalizing circuit can be directly transferred to any battery monomer with lower voltage from any battery monomer with higher voltage, the equalizing speed of the battery pack is further improved on the basis of the automatic switch capacitance equalizing topology, the using quantity of the switch devices is reduced at the same time, and the technical problem that the equalizing speed between the battery monomers of the automatic switch capacitor equalizing topology is slower than that of the battery equalizing topology based on the switch capacitance is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a conventional switched capacitor-based battery equalization topology.
Fig. 2 is a driving signal diagram of a conventional switched capacitor-based battery equalization topology.
Fig. 3 is a circuit schematic diagram of a prior art automatic switched capacitor equalization topology.
Fig. 4a is a schematic circuit diagram of a conventional automatic switched capacitor equalization topology.
Fig. 4b is a circuit schematic diagram of another operation of the prior art automatic switched capacitor equalization topology.
Fig. 5 is a schematic circuit diagram of a hybrid equalizer circuit for a series battery according to an embodiment of the present invention.
Fig. 6 is a circuit schematic diagram of a first operation mode of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
Fig. 7 is a circuit schematic diagram of a second operation mode of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
Fig. 8a is a diagram illustrating a voltage equalization result of two battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
Fig. 8b is a diagram illustrating the voltage equalization result of four battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
Fig. 8c is a diagram illustrating voltage equalization results of six battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a series battery pack hybrid equalizing circuit and a control method and device thereof, which are used for solving the technical problem that the equalizing speed between single batteries of an automatic switched capacitor equalizing topological structure is slower than that of a switched capacitor-based battery equalizing topological structure.
The first embodiment is as follows:
the embodiment of the invention provides a series battery pack hybrid equalizing circuit, which comprises n battery packs connected in series in sequence, wherein n is a positive integer, a first switching device is connected between every two adjacent battery packs, and the two adjacent battery packs form an equalizing unit;
each battery pack comprises two battery monomers, an inductance device, a capacitance device and 5 second switch devices, wherein the two battery monomers are marked as a first battery monomer and a second battery monomer, the 5 second switch devices are marked as a second switch device a, a second switch device b, a second switch device c, a second switch device d and a second switch device e, and the cathode of the capacitance device is connected with the second end of the second switch device e and is marked as a first node; the first ends of the first switching devices of two adjacent series-connected battery packs are connected with the first node of one series-connected battery pack, and the second ends of the first switching devices are connected with the first node of the other series-connected battery pack.
In the embodiment of the present invention, a first battery cell is connected in series with a second battery cell, a positive electrode of the first battery cell is respectively connected with a first end of a second switching device a and a first end of a second switching device c, a second end of the second switching device c is respectively connected with a first end of a second switching device d and a positive electrode of a capacitor device, a negative electrode of the capacitor device is respectively connected with a second end of a second switching device e and a first end of the first switching device, a first end of the second switching device e is respectively connected with a second end of the second switching device d and a second end of the second switching device c of an adjacent second battery pack, a first end of the second switching device c of the adjacent second battery pack is respectively connected with a second end of the second switching device b and a negative electrode of the second battery cell, a first end of an inductor device is respectively connected with a negative electrode of the first battery cell and a positive electrode of the second battery cell, the second terminal of the inductance device is connected to the second terminal of the second switching device a and the first terminal of the second switching device b, respectively.
It should be noted that the first switching device and the second switching device are both MOS transistors, the source of the MOS transistor is the second end of the first switching device and the second switching device, and the drain of the MOS transistor is the first end of the first switching device and the second switching device. The capacitor device is preferably an electrolytic capacitor.
Fig. 5 is a schematic circuit diagram of a hybrid equalizer circuit for a series battery pack according to an embodiment of the present invention, fig. 6 is a schematic circuit diagram of a hybrid equalizer circuit for a series battery pack according to an embodiment of the present invention in a first operation mode, and fig. 7 is a schematic circuit diagram of a hybrid equalizer circuit for a series battery pack according to an embodiment of the present invention in a second operation mode.
As shown in fig. 5, the series battery hybrid equalizing circuit includes 2n battery cells connected in series, n inductance devices, n capacitance devices, and 3 (n-1) switching devices, where n is an integer greater than 0. The first node is marked as A, and the battery cell is marked as BnAnd the capacitive device is denoted as CnThe inductive component is denoted LnThe second switching device a is denoted as SnaAnd the second switching device b is denoted as SnbAnd the second switching device c is denoted as SncThe second switching device d is denoted as SndAnd the second switching device e is denoted as SneThe first switching device is denoted Sn. In this embodiment, an equalizing unit composed of a first battery pack and a second battery pack is used for explanation, wherein the first battery pack comprises a first battery cell B1A second battery cell B2A second switching device S1aA second switching device S1bA second switching device S1cA second switching device S1dA second switching device S1eInductor device L1And a capacitor element C1The second battery pack comprises a first battery monomer B3A second battery cell B4A second switching device S2aA second switching device S2bA second switching device S1c、Second switching device S2dA second switching device S2eInductor device L2And a capacitor element C2. A first battery monomer B1And a first battery unitBody B3Are all high voltage batteries, the second battery monomer B2And a second battery cell B4The working principle of the series battery pack hybrid equalizing circuit is described for all low-voltage batteries, and the first battery monomer B of the first battery pack1And a second battery cell B2Is greater than the corresponding capacitive device C1Voltage of the first battery cell B of the second battery pack3And a second battery cell B4Is less than the corresponding capacitive device C2The specific working principle of the voltage is as follows:
in a first mode of operation, as shown in fig. 6, the second switching device S of the hybrid equalizer circuit for series-connected battery packs1aAnd a second switching device S2aOn, the first battery monomer B1And a first battery cell B3Respectively flow to the inductance device L1And an inductive device L2I.e. the first battery cell B1Is an inductive device L1Charging, first battery cell B3Is an inductive device L2And (6) charging. At the second switching device S1aAnd a second switching device S2aOn the basis of conduction, the second switching device S of the switching tube is simultaneously used1cA second switching device S2cAnd a second switching device S1eOn, the second switching device S1bA second switching device S1dA second switching device S2bAnd a first switching device S1And (6) turning off. Because the first battery cell B of the first battery pack1And a second battery cell B2Is greater than the corresponding capacitive device C1Voltage of the first battery cell B of the first battery pack1And a second battery cell B2To the capacitor device C1In storage. First battery monomer B of second battery pack3And a second battery cell B4Is less than the corresponding capacitive device C2Voltage of the second battery, capacitive device C of the second battery2The electric energy of (1) flows to the first battery cell B3And a second battery cell B4In (1).
In a second mode of operation, as shown in fig. 7, of the hybrid equalizer circuit for series-connected battery packsTurn off the second switching device S1aAnd a second switching device S2aTurn off and turn on the second switching device S1bAnd a second switching device S2bThe stored energy in the inductive device L1 is transferred to the second battery cell B2In the middle release, the stored energy in the inductive device L2 is transferred to the second battery cell B4And releasing. The voltage across the inductive device L1 is equal to the second cell B2The voltage across the inductive device L1 is the second battery cell B2And (6) charging. The voltage across the inductive device L2 is equal to the second cell B4The voltage across the inductive device L2 is the second battery cell B4And (6) charging. Based on turning off the second switching device S1aAnd a second switching device S2aTurning on the second switching device S1bAnd a second switching device S2bOn the basis of simultaneously turning off the second switching device S1cA second switching device S2cA second switching device S1eTurning on the second switching device S1dAnd a first switching device S1The capacitor device C1 is connected in parallel with the capacitor device C2, and the electric energy of the high-voltage container device flows to the electric energy of the low-voltage container device, so that the electric energy balance among the energy storage elements (the battery monomer, the inductance device and the capacitor device) in the balancing unit is realized.
The invention provides a series battery pack hybrid equalizing circuit, which adopts n battery packs which are sequentially connected in series, wherein a first switching device is connected between two adjacent battery packs, and the two adjacent battery packs form an equalizing unit; the high electric energy of the battery monomer, the inductance device and the capacitance device in each battery pack flows to the battery monomer with low electric energy through the connection or disconnection of the first switch device and the second switch device, the energy transfer between any battery monomer and the battery monomer is realized in the inductance device and the capacitance device, the electric quantity of the series battery pack hybrid equalizing circuit can be directly transferred to any battery monomer with lower voltage from any battery monomer with higher voltage, the equalizing speed of the battery pack is further improved on the basis of the automatic switch capacitance equalizing topology, the using quantity of the switch devices is reduced at the same time, and the technical problem that the equalizing speed between the battery monomers of the automatic switch capacitor equalizing topology is slower than that of the battery equalizing topology based on the switch capacitance is solved.
In one embodiment of the invention, each battery pack further comprises a resistive device connected in series with the inductive device.
Fig. 8a is a diagram illustrating a voltage equalization result of two battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention, fig. 8b is a diagram illustrating a voltage equalization result of four battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention, and fig. 8c is a diagram illustrating a voltage equalization result of six battery cells of the hybrid equalizing circuit of the series battery pack according to the embodiment of the present invention.
As shown in fig. 8a, the battery pack is subjected to the equalization test by using the voltages of two battery cells of 2.5V and 2.7V, the left side of fig. 8a is the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the automatic switched capacitor equalization topology structure, and the right side of fig. 8a is the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the series battery pack hybrid equalization circuit. As shown in fig. 8b, the battery pack is subjected to the equalization test by using the voltages of the four battery cells of 2.5V, 2.57V, 2.63V and 2.7V, the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the equalization topology of the automatic switched capacitor is shown on the left side of fig. 8b, and the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the hybrid equalization circuit of the series battery pack is shown on the right side of fig. 8 b. As shown in fig. 8c, the battery pack is subjected to the equalization test by using the voltages of six battery cells of 2.5V, 2.54V, 2.58V, 2.62V, 2.66V and 2.7V, the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the equalization topology structure of the automatic switched capacitor is shown on the left side of fig. 8c, and the voltage equalization result obtained by performing the equalization test on the battery cell of the battery pack by using the hybrid equalization circuit of the series battery pack is shown on the right side of fig. 8 c. The equalization circuit is formed by the battery monomers with different numbers for testing, the series battery pack hybrid equalization circuit completes equalization within 0.5s of the voltage between the battery monomers no matter two battery monomers, four battery monomers or six battery monomers, and the equalization topological structure of the automatic switch capacitor does not reach equalization within 0.5s, so that the equalization speed of the series battery pack hybrid equalization circuit is greatly improved, and the series battery pack hybrid equalization circuit improves the equalization speed of a battery pack.
Example two:
the embodiment of the present invention further provides a method for controlling a hybrid equalizing circuit of a series battery pack, which is applied to the hybrid equalizing circuit of the series battery pack, where two adjacent battery packs in an equalizing unit are denoted as a first battery pack and a second battery pack, a first battery cell of the first battery pack and a first battery cell of the second battery pack are both high-voltage batteries, a second battery cell of the first battery pack and a second battery cell of the second battery pack are both low-voltage batteries, a total voltage of the two battery cells of the first battery pack is greater than a voltage of a capacitive device of the first battery pack, and a total voltage of the two battery cells of the second battery pack is less than a voltage of a capacitive device of the second battery pack, and the method includes:
if the second switching device a, the second switching device c and the second switching device e of the two battery packs are switched on, the first switching device, the second switching device b and the second switching device d are switched off, the first battery monomers of the two battery packs take out electric energy, voltages at two ends of the first battery monomers of the two battery packs are added to two ends of the corresponding inductance device, namely the first battery monomers charge the inductance device; the electric energy of the two single batteries of the first battery pack flows to the capacitor device of the first battery pack to be stored, and the electric energy of the capacitor device of the second battery pack flows to the two single batteries of the second battery pack to be stored;
if the second switching device b, the second switching device d and the first switching device of the two battery packs are switched on, the second switching device a, the second switching device c and the second switching device e are switched off, the stored energy of the inductance device of each battery pack flows to the second battery monomer of the corresponding battery pack for storage, and when the voltage at two ends of the inductance device of each battery pack is greater than the voltage at two ends of the corresponding second battery monomer, the inductance device charges the corresponding second battery monomer; the capacitive devices of the first battery set are connected in parallel with the capacitive devices of the second battery set and energy will be transferred from the capacitive devices of the high voltage into the capacitive devices of the low voltage.
In the embodiment of the invention, the voltage among all the single batteries in the series battery pack hybrid equalizing circuit is equalized within 0.5 s.
It should be noted that, in the second embodiment, the series battery hybrid equalization circuit is described in detail in the first embodiment, and the control method of the series battery hybrid equalization circuit is correspondingly set according to the first operation mode and the second operation mode of the operation principle of the series battery hybrid equalization circuit in the second embodiment, so that the contents of the control method of the series battery hybrid equalization circuit in the second embodiment are not described in detail.
Example three:
the embodiment of the invention also provides a hybrid equalizing circuit device of the series battery pack, which comprises the hybrid equalizing circuit of the series battery pack.
It should be noted that the hybrid equalization circuit for the series battery pack in the third embodiment has been described in detail in the first embodiment, and therefore, the contents of the hybrid equalization circuit for the series battery pack in the third embodiment are not described in detail.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A control method of a series battery pack hybrid equalizing circuit is applied to the series battery pack hybrid equalizing circuit and is characterized in that the series battery pack hybrid equalizing circuit comprises n battery packs which are sequentially connected in series, n is a positive integer, a first switch device is connected between every two adjacent battery packs, the two adjacent battery packs form an equalizing unit, the two adjacent battery packs in the equalizing unit are marked as a first battery pack and a second battery pack, a first battery monomer of the first battery pack and a first battery monomer of the second battery pack are both high-voltage batteries, a second battery monomer of the first battery pack and a second battery monomer of the second battery pack are both low-voltage batteries, and the total voltage of the two battery monomers of the first battery pack is greater than the voltage of a capacitance device of the first battery pack, the total voltage of two battery cells of the second battery pack is smaller than the voltage of a capacitance device of the second battery pack, and the control method comprises the following steps:
if the second switching devices a, c and e of the two battery packs are switched on, the first switching devices, b and d are switched off, the first battery monomers of the two battery packs take out electric energy, and the voltages at the two ends of the first battery monomers of the two battery packs are added to the two ends of the corresponding inductance device, namely the first battery monomers charge the inductance device; the electric energy of the two single batteries of the first battery pack flows to a capacitive device of the first battery pack to be stored, and the electric energy of the capacitive device of the second battery pack flows to the two single batteries of the second battery pack to be stored;
if the second switching device b, the second switching device d and the first switching device of the two battery packs are switched on, the second switching device a, the second switching device c and the second switching device e are switched off, the stored energy of the inductance device of each battery pack flows to the second battery monomer of the corresponding battery pack for storage, and when the voltage at two ends of the inductance device of each battery pack is greater than the voltage at two ends of the corresponding second battery monomer, the inductance device charges the corresponding second battery monomer; the capacitive devices of the first battery set are connected in parallel with the capacitive devices of the second battery set, energy is transferred from the capacitive devices of high voltage into the capacitive devices of low voltage;
each battery pack comprises two battery monomers, an inductance device, a capacitance device and 5 second switch devices, wherein the two battery monomers are marked as a first battery monomer and a second battery monomer, the 5 second switch devices are marked as a second switch device a, a second switch device b, a second switch device c, a second switch device d and a second switch device e, and the cathode of the capacitance device is connected with the second end of the second switch device e and is marked as a first node;
the first ends of the first switching devices of two adjacent series battery packs are connected with the first node of one series battery pack, and the second ends of the first switching devices are connected with the first node of the other series battery pack;
the first battery cell is connected in series with the second battery cell, the positive electrode of the first battery cell is respectively connected with the first end of the second switching device a and the first end of the second switching device c, the second end of the second switching device c is respectively connected with the first end of the second switching device d and the positive electrode of the capacitive device, the negative electrode of the capacitive device is respectively connected with the second end of the second switching device e and the first end of the first switching device, the first end of the second switching device e is respectively connected with the second end of the second switching device d and the second end of the second switching device c adjacent to the second battery pack, the first end of the second switching device c adjacent to the second battery pack is respectively connected with the second end of the second switching device b and the negative electrode of the second battery cell, and the first end of the inductive device is respectively connected with the negative electrode of the first battery cell and the negative electrode of the second battery cell And the second end of the inductance device is respectively connected with the second end of the second switch device a and the first end of the second switch device b.
2. The method as claimed in claim 1, wherein the balancing of the voltages between the cells in the series battery hybrid balancing circuit is performed within 0.5 s.
3. The method as claimed in claim 1, wherein each of the battery packs further comprises a resistor device connected in series with the inductor device.
4. The method as claimed in claim 1, wherein the first switching device and the second switching device are both MOS transistors, sources of the MOS transistors are second ends of the first switching device and the second switching device, and drains of the MOS transistors are first ends of the first switching device and the second switching device.
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| CN204992686U (en) * | 2015-08-31 | 2016-01-20 | 卢小明 | Battery power equalizing system |
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