CN114665577B - Battery pack charging and discharging device - Google Patents

Battery pack charging and discharging device Download PDF

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Publication number
CN114665577B
CN114665577B CN202210581624.1A CN202210581624A CN114665577B CN 114665577 B CN114665577 B CN 114665577B CN 202210581624 A CN202210581624 A CN 202210581624A CN 114665577 B CN114665577 B CN 114665577B
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China
Prior art keywords
switch
battery
series
battery pack
optimizers
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CN114665577A (en
Inventor
徐�明
孙巨禄
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Powerland Technology Inc
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Powerland Technology Inc
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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
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention discloses a battery pack charging and discharging device which comprises a first series battery pack, a first switch circuit, a second series battery pack, a second switch circuit, a first switch, a first inductor and a second switch, wherein the first switch circuit is connected with the first series battery pack in parallel, the output end of the first switch circuit is connected to the first end of the first inductor through the first switch, the second switch circuit is connected with the second series battery pack in parallel, the output end of the second switch circuit is connected to the first end of the first inductor through the second switch, the second end of the first inductor is connected with a first alternating current end, and the series midpoint of the first series battery pack and the second series battery pack is connected with a second alternating current end. The charging and discharging circuit is simple and easy to control, and achieves high efficiency.

Description

Battery pack charging and discharging device
Technical Field
The present invention relates to the field of battery charging, and more particularly to a high efficiency battery charging and discharging device.
Background
Battery packs are widely used in the fields of electric vehicles, power grids, and electric power, etc., because they can provide higher voltages and larger capacities than single batteries. During the production process, due to the limitation of manufacturing equipment and manufacturing process, the performance parameters of each battery are difficult to keep consistent. In the charging and discharging process, the problem of unbalanced charging and discharging of the battery pack is caused by the difference of voltage and capacity between single batteries. Such imbalance may cause aging of the battery, a reduction in battery life, a low energy utilization efficiency, and also may cause a potential safety hazard, and in severe cases, may even cause combustion and explosion.
In order to ensure the safe use of the battery pack, a battery optimizer is usually added to the battery pack in practical application. In the prior art, a battery optimizer is connected in parallel after a battery string is connected, and then the equalized direct-current voltage is connected to a post-stage DC/AC conversion circuit to generate alternating current.
Disclosure of Invention
The invention aims to provide a high-efficiency battery pack charging and discharging device. Meanwhile, a switch circuit is arranged behind the battery optimizer, trapezoidal waves approaching sine waves are generated by controlling the on-off of a switch and are connected to an alternating current load or an alternating current power supply, and a rear-stage DC/AC conversion circuit is omitted.
In an embodiment of a battery pack charging and discharging device according to the present invention, the battery pack charging and discharging device includes a first series battery pack, a first switch circuit, a first switch, a second series battery pack, a second switch circuit, a second switch, and a first inductor, the first series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with first ends of the battery optimizers, second ends of the plurality of battery optimizers are connected in series, the first switch circuit includes a plurality of third switches, first ends of the third switches are respectively connected with anodes of second ends of the battery optimizers, second ends of the plurality of third switches are connected in parallel and then connected to first ends of the first inductors through the first switches, the second series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with first ends of the battery optimizers, the second ends of the plurality of battery optimizers are connected in series, the second switch circuit comprises a plurality of fourth switches, the first ends of the fourth switches are respectively connected with the negative poles of the second ends of the battery optimizers, the second ends of the plurality of fourth switches are connected in parallel and then connected to the first end of the first inductor through the second switch, the second end of the first inductor is connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and the second alternating current end is connected with the series midpoint of the first series battery pack and the second series battery pack.
In an embodiment of the battery pack charging and discharging device according to the present invention, the first series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries, and the second series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries.
In an embodiment of the battery pack charging and discharging device of the present invention, the battery optimizer is a buck-boost converter circuit.
In an embodiment of the battery pack charging and discharging device, an alternating current load is connected in parallel between a first alternating current end and a second alternating current end, the battery supplies power for the alternating current load, the first switch is turned on in the positive half cycle of the alternating current load, a plurality of third switches are turned on in turn, and a trapezoidal wave is obtained at the first end of the first inductor; and in the alternating current load half cycle, the second switch is conducted, the plurality of fourth switches are conducted in turn, and the first end of the first inductor is provided with a trapezoidal wave.
In an embodiment of the battery pack charge and discharge device according to the present invention, an output voltage of the battery optimizer is stable, and a pulse width of the third switch or the fourth switch is changed.
In an embodiment of the battery pack charge/discharge device according to the present invention, a pulse width of the third switch or the fourth switch is fixed, and an output voltage of the battery optimizer changes.
In an embodiment of the battery pack charging and discharging device according to the present invention, an ac power supply is connected in parallel between a first ac terminal and a second ac terminal, the ac power supply charges the battery, the first switch is turned on during a positive half cycle of the ac power supply, the third switch is selectively turned on, a corresponding battery optimizer is connected in parallel with the ac power supply, and the battery connected in parallel is charged, the second switch is turned on during a negative half cycle of the ac power supply, the fourth switch is selectively turned on, the corresponding battery optimizer is connected in parallel with the ac power supply, and the battery connected in parallel is charged.
In an embodiment of a battery pack charging and discharging device according to the present invention, the battery pack charging and discharging device includes a first series battery pack, a first switch, a second series battery pack, a second switch, and a first inductor, the first series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with first ends of the battery optimizers, second ends of the plurality of battery optimizers are connected in series, anodes of second ends of the plurality of battery optimizers of the first series battery pack are connected in parallel and then connected to a first end of the first inductor through the first switch, the second series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with the first ends of the battery optimizers, second ends of the plurality of battery optimizers are connected in series, cathodes of second ends of the plurality of battery optimizers of the second series battery pack are connected in parallel and then connected to a first end of the first inductor through the second switch, the second end of the first inductor is connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and the second alternating current end is connected with the series midpoint of the first series battery pack and the second series battery pack.
In an embodiment of the battery pack charging and discharging device according to the present invention, the first series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries, and the second series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries.
In an embodiment of the battery pack charging and discharging device of the present invention, the battery optimizer is a buck-boost converter circuit.
In the embodiment of the battery pack charging and discharging device, an alternating current load is connected in parallel between a first alternating current end and a second alternating current end, the battery supplies power for the alternating current load, the first switch is conducted in the positive half cycle of the alternating current load, a plurality of battery optimizers in the first series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor; and in the alternating current load half cycle, the second switch is conducted, the plurality of battery optimizers in the second series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor.
In an embodiment of the battery pack charging and discharging device of the present invention, the output voltage of the battery optimizer is stable, and the operating time of the battery optimizer changes.
In an embodiment of the battery pack charging and discharging device of the present invention, the operating time of the battery optimizer is fixed, and the output voltage of the battery optimizer changes.
In an embodiment of the battery pack charging and discharging device, an alternating current power supply is connected in parallel between a first alternating current end and a second alternating current end, the alternating current power supply charges the batteries, the first switch is turned on in the positive half cycle of the alternating current power supply, certain battery optimizers connected with the first switch are selected to work, the corresponding battery optimizers are connected in parallel with the alternating current power supply and charge the batteries connected in parallel, and the second switch is turned on in the negative half cycle of the alternating current power supply, certain battery optimizers connected with the second switch are selected to work, the corresponding battery optimizers are connected in parallel with the alternating current power supply and charge the batteries connected in parallel.
The invention also provides a three-phase battery pack charging and discharging device, which comprises a first series battery pack, a first switch circuit, a first switch, a second series battery pack, a second switch circuit, a second switch, a first inductor, a third switch circuit, a ninth switch, a fourth switch circuit, a tenth switch, a third inductor, a fifth switch circuit, an eleventh switch, a sixth switch circuit, a twelfth switch and a fourth inductor, wherein the first series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the first switch circuit comprises a plurality of third switches, the third switch circuit comprises a plurality of thirteenth switches, and the fifth switch circuit comprises a plurality of fourteenth switches, the first end of the third switch, the first end of the thirteenth switch and the first end of the fourteenth switch are respectively connected with the positive electrode of the second end of the battery optimizer, the second ends of the plurality of third switches are connected in parallel and then connected to the first end of the first inductor through the first switch, the second ends of the plurality of thirteenth switches are connected in parallel and then connected to the first end of the third inductor through the ninth switch, the second ends of the plurality of fourteenth switches are connected in parallel and then connected to the first end of the fourth inductor through the eleventh switch, the second series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with the first end of the battery optimizers, the second ends of the plurality of battery optimizers are connected in series, the second switch circuit comprises a plurality of fourth switches, and the fourth switch circuit comprises a plurality of fifteenth switches, the sixth switching circuit includes a plurality of sixteenth switches, a first end of the fourth switch, a first end of the fifteenth switch, and a first end of the sixteenth switch are respectively connected to a negative electrode of the second end of the battery optimizer, a second end of the plurality of fourth switches is connected in parallel to the first end of the first inductor through the second switch, a second end of the plurality of fifteenth switches is connected in parallel to the first end of the third inductor through the tenth switch, a second end of the plurality of sixteenth switches is connected in parallel to the first end of the fourth inductor through the twelfth switch, the second end of the first inductor is connected to the first ac terminal, the second end of the third inductor is connected to the third ac terminal, the second end of the fourth inductor is connected to the fifth ac terminal, and the first series battery pack and the second series battery pack are connected in series, the second alternating current end, the fourth alternating current end and the sixth alternating current end are connected with the series midpoint of the first series battery pack and the second series battery pack, the first alternating current end, the third alternating current end and the fifth alternating current end are respectively a port of three-phase alternating current, and the second alternating current end, the fourth alternating current end and the sixth alternating current end are connected together to form a neutral point of the three-phase alternating current.
In an embodiment of the three-phase battery pack charging and discharging device of the present invention, the first series battery pack includes at least 4 battery optimizers and at least 4 batteries, and the second series battery pack includes at least 4 battery optimizers and at least 4 batteries.
In an embodiment of the three-phase battery pack charging and discharging device of the invention, the battery optimizer is a buck-boost conversion circuit.
In the embodiment of the three-phase battery pack charging and discharging device, a three-phase alternating current load is connected in parallel between the first alternating current end and the sixth alternating current end, the first switch is conducted in the positive half cycle of the first alternating current load, a plurality of third switches are conducted in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the negative half cycle of the first-phase alternating-current load, the second switch is conducted, the plurality of fourth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the positive half cycle of the second-phase alternating current load, the ninth switch is conducted, the thirteenth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the third inductor; in a second-phase alternating current load half cycle, the tenth switch is conducted, the fifteenth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the third inductor; in the positive half cycle of the third-phase alternating-current load, the eleventh switch is turned on, the fourteenth switches are turned on in turn, and trapezoidal waves are obtained at the first end of the fourth inductor; and in the negative half cycle of the third-phase alternating-current load, the twelfth switch is conducted, the sixteenth switches are conducted in turn, and the first end of the fourth inductor is provided with a trapezoidal wave.
In an embodiment of the three-phase battery pack charging and discharging device according to the present invention, an output voltage of the battery optimizer is stable, and a pulse width of the third switch, the fourth switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, or the sixteenth switch is changed.
In an embodiment of the three-phase battery pack charging and discharging device according to the present invention, a pulse width of the third switch, the fourth switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, or the sixteenth switch is fixed, and an output voltage of the battery optimizer changes.
In the embodiment of the three-phase battery pack charging and discharging device, a three-phase alternating current power supply is connected in parallel between the first alternating current end and the sixth alternating current end, the first switch is conducted in the positive half cycle of the first alternating current power supply, the third switch is conducted selectively, and a corresponding battery optimizer is connected with the first alternating current power supply in parallel; in the negative half cycle of the first alternating current power supply, the second switch is conducted, the fourth switch is conducted selectively, and the corresponding battery optimizer is connected with the first alternating current power supply in parallel; in the positive half cycle of the second-phase alternating-current power supply, the ninth switch is switched on, the thirteenth switch is selectively switched on, and the corresponding battery optimizer is connected with the second-phase alternating-current power supply in parallel; in the negative half cycle of the second-phase alternating-current power supply, the tenth switch is turned on, the fifteenth switch is selected, and the corresponding battery optimizer is connected with the second-phase alternating-current power supply in parallel; in the positive half cycle of a third-phase alternating-current power supply, the eleventh switch is conducted, the fourteenth switch is conducted selectively, and the corresponding battery optimizer is connected with the third-phase alternating-current power supply in parallel; and in the negative half cycle of the third-phase alternating-current power supply, the twelfth switch is conducted, the sixteenth switch is conducted selectively, and the corresponding battery optimizer is connected with the third-phase alternating-current power supply in parallel.
In an embodiment of a three-phase battery pack charging and discharging device according to the present invention, the three-phase battery pack charging and discharging device includes a first series battery pack, a first switch, a second series battery pack, a second switch, a first inductor, a third series battery pack, a ninth switch, a fourth series battery pack, a tenth switch, a third inductor, a fifth series battery pack, an eleventh switch, a sixth series battery pack, a twelfth switch, and a fourth inductor, the first series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with a first end of the battery optimizers, second ends of the plurality of battery optimizers are connected in series, anodes of second ends of the plurality of battery optimizers of the first series battery pack are connected in parallel and then connected to a first end of the first inductor through the first switch, the second series battery pack includes a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the negative electrodes of the second ends of the battery optimizers of the second series battery pack are connected in parallel and then connected to the first end of the first inductor through the second switch, the second end of the first inductor is connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and the second alternating current end is connected with the series midpoint of the first series battery pack and the second series battery pack; the third series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the anodes of the second ends of the battery optimizers of the third series battery pack are connected in parallel and then connected to the first end of the third inductor through the ninth switch, the fourth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the cathodes of the second ends of the battery optimizers of the fourth series battery pack are connected in parallel and then connected to the first end of the third inductor through the tenth switch, the second end of the third inductor is connected with a third alternating current end, and the third series battery pack and the fourth series battery pack are connected in series, the fourth alternating current end is connected with the series midpoint of the third series battery pack and the fourth series battery pack; the fifth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the anodes of the second ends of the plurality of battery optimizers of the fifth series battery pack are connected in parallel and then connected to the first end of the fourth inductor through the eleventh switch, the sixth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the cathodes of the second ends of the plurality of battery optimizers of the sixth series battery pack are connected in parallel and then connected to the first end of the fourth inductor through the twelfth switch, the second end of the fourth inductor is connected with the fifth alternating current end, and the fifth series battery pack and the sixth series battery pack are connected in series, the sixth alternating current end is connected with the series midpoint of the fifth series battery pack and the sixth series battery pack; the first alternating current end, the third alternating current end and the fifth alternating current end are respectively a port of three-phase alternating current, and the second alternating current end, the fourth alternating current end and the sixth alternating current end are connected together to form a neutral point of the three-phase alternating current.
In an embodiment of the three-phase battery pack charging and discharging device of the present invention, the first series battery pack, the second series battery pack, the third series battery pack, the fourth series battery pack, the fifth series battery pack, and the sixth series battery pack respectively include at least 4 of the battery optimizers and at least 4 of the batteries.
In an embodiment of the three-phase battery pack charging and discharging device of the invention, the battery optimizer is a buck-boost conversion circuit.
In the embodiment of the three-phase battery pack charging and discharging device, a three-phase alternating current load is connected in parallel between the first alternating current end and the sixth alternating current end, the first switch is conducted in the positive half cycle of the first alternating current load, the plurality of battery optimizers in the first series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the negative half cycle of the first-phase alternating-current load, the second switch is conducted, the plurality of battery optimizers in the second series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the positive half cycle of the second-phase alternating current load, the ninth switch is conducted, the plurality of battery optimizers in the third series battery pack work in turn, and trapezoidal waves are obtained at the first end of the third inductor; in a second phase alternating current load half cycle, the tenth switch is conducted, the plurality of battery optimizers in the fourth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the third inductor; in the positive half cycle of the third-phase alternating-current load, the eleventh switch is turned on, the plurality of battery optimizers in the fifth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the fourth inductor; and in the negative half cycle of the third-phase alternating-current load, the twelfth switch is switched on, the plurality of battery optimizers in the sixth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the fourth inductor.
In the embodiment of the three-phase battery pack charging and discharging device, the output voltage of the battery optimizer is stable, and the working time of the battery optimizer is changed.
In the embodiment of the three-phase battery pack charging and discharging device, the working time of the battery optimizer is fixed, and the output voltage of the battery optimizer is changed.
In the embodiment of the three-phase battery pack charging and discharging device, a three-phase alternating current power supply is connected in parallel between the first alternating current end and the sixth alternating current end, the first switch is conducted in the positive half cycle of the first alternating current power supply, certain battery optimizers connected with the first switch are selected to work, and the corresponding battery optimizers are connected with the first alternating current power supply in parallel; in the negative half cycle of the first alternating current power supply, the second switch is conducted, certain battery optimizers connected with the second switch are selected to work, and the corresponding battery optimizers are connected with the first alternating current power supply in parallel; in the positive half cycle of the second-phase alternating-current power supply, the ninth switch is conducted, certain battery optimizers connected with the ninth switch are selected to work, and the corresponding battery optimizers are connected with the second-phase alternating-current power supply in parallel; in the negative half cycle of the second-phase alternating-current power supply, the tenth switch is conducted, certain battery optimizers connected with the tenth switch are selected to work, and the corresponding battery optimizers are connected with the second-phase alternating-current power supply in parallel; in the positive half cycle of the third-phase alternating-current power supply, the eleventh switch is conducted, certain battery optimizers connected with the eleventh switch are selected to work, and the corresponding battery optimizers are connected with the third-phase alternating-current power supply in parallel; and in the negative half cycle of the third-phase alternating-current power supply, the twelfth switch is conducted, certain battery optimizers connected with the twelfth switch are selected to work, and the corresponding battery optimizers are connected with the third-phase alternating-current power supply in parallel.
The battery pack charging and discharging device has the advantages that the battery optimizer is configured for each battery for charging and discharging management, so that the problem of unbalanced serial connection of the batteries is solved; meanwhile, the battery pack charging and discharging device generates sine alternating current by controlling the on-off of the switch, a rear-stage DC/AC conversion circuit is omitted, the cost is saved, and the battery pack is higher in efficiency and smaller in size.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram of a battery pack charging and discharging apparatus according to a first embodiment of the present invention.
Fig. 2 is a circuit diagram illustrating a first embodiment of the battery charging/discharging device of fig. 1.
Fig. 3 is a circuit diagram of the first embodiment when n =4 in fig. 2.
Fig. 4 is a diagram of the driving waveforms and the output voltage waveforms of the switch shown in fig. 3.
Fig. 5 is a circuit diagram of a battery charging/discharging device according to a second embodiment of the present invention.
Fig. 6 is a block diagram of a charging and discharging device of a three-phase battery pack according to a first embodiment of the present invention.
Fig. 7 is a block diagram of a charging and discharging device of a three-phase battery pack according to a second embodiment of the present invention.
In the drawings, like reference numerals refer to the same drawing elements.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Fig. 1 shows a block diagram of a first embodiment of a battery pack charging and discharging apparatus according to the present invention. As shown in fig. 1, a battery pack charging and discharging apparatus 100 includes a first series battery pack 11, a first switch circuit 12, a switch S1, a second series battery pack 21, a second switch circuit 22, a switch S2, and an inductor L1. The first series battery 11 provides a first set of dc voltages, the first switch circuit 12 is connected in parallel with the first series battery 11 and controls the output voltage of the first series battery 11 and generates a trapezoidal wave, the second series battery 21 provides a second set of dc voltages, the second switch circuit 22 is connected in parallel with the second series battery 21 and controls the output voltage of the second series battery 21 and generates a trapezoidal wave, the output terminal of the first switch circuit 12 is connected to the first terminal of the inductor L1 through the switch S1, the output terminal of the second switch circuit 22 is connected to the first terminal of the inductor L1 through the switch S2, the second terminal of the inductor L1 is connected to the first ac terminal 01, the first series battery 11 is connected in series with the second series battery 21, and the series midpoint thereof is connected to the second ac terminal 02. When the first alternating current end 01 and the second alternating current end 02 are connected in parallel with an alternating current load, the first series battery pack 11 and the second series battery pack 21 supply power to the alternating current load, the switch S1 is switched on, and a positive sine wave is obtained between the first alternating current end 01 and the second alternating current end 02 after filtering through the inductor L1; the switch S2 is turned on, and a negative sine wave is obtained between the first ac terminal 01 and the second ac terminal 02 after filtering through the inductor L1. When the first ac terminal 01 and the second ac terminal 02 are connected in parallel with an ac power source, the ac power source charges the first series battery 11 and the second series battery 21, the switch S1 is turned on during the positive half cycle of the ac power source, and the first switch circuit 12 supplies power to the first series battery 11 after filtering through the inductor L1; during the negative half cycle of the ac power, the switch S2 is turned on, and the second switch circuit 22 supplies power to the second series battery 21 after filtering through the inductor L1.
More specifically, referring to fig. 2, the first series battery 11 includes n battery optimizers and n batteries, preferably at least 4 batteries, respectively, battery B11 is connected in parallel with the first terminal of battery optimizer BO11, battery B12 is connected in parallel with the first terminal of battery optimizer BO12 until battery B1n is connected in parallel with the first terminal of battery optimizer BO1n, and battery optimizer BO11 is connected in series until the second terminal of battery optimizer BO1 n. The battery optimizer performs charge and discharge management and battery series balance. The first switch circuit 12 includes n switches, one end of the switch S11 is connected to the positive electrode of the second end of the battery optimizer BO11, the other end of the switch S11 is connected to the first end of the switch S1, one end of the switch S12 is connected to the positive electrode of the second end of the battery optimizer BO12, the other end of the switch S12 is connected to the first end of the switch S1, until the switch S1n, one end of the switch S1n is connected to the positive electrode of the second end of the battery optimizer BO1n, the other end of the switch S1n is connected to the first end of the switch S1, and the switches S11, S12, until the switch S1n controls whether the output voltage V1n of the corresponding battery optimizer BO1n is used or not. The second terminal of the switch S1 is connected to the first ac terminal 01 via the inductor L1, and the switch S1 controls whether to connect the output voltage of the first series battery 11 to the first terminal of the inductor L1.
The second series battery pack 21 comprises n battery optimizers and n batteries, preferably at least 4 batteries each, battery B21 is connected in parallel with the first terminal of battery optimizer BO21, battery B22 is connected in parallel with the first terminal of battery optimizer BO22 until battery B2n is connected in parallel with the first terminal of battery optimizer BO2n, and battery optimizer BO21 is connected in series with the second terminal of battery optimizer BO2 n. The battery optimizer performs charge and discharge management and battery series balance. The second switch circuit 22 includes at least 4 switches, one end of the switch S21 is connected to the negative electrode of the second end of the battery optimizer BO21, the other end of the switch S21 is connected to the first end of the switch S2, one end of the switch S22 is connected to the negative electrode of the second end of the battery optimizer BO22, the other end of the switch S22 is connected to the first end of the switch S2, until the switch S2n, one end of the switch S2n is connected to the negative electrode of the second end of the battery optimizer BO2n, the other end of the switch S2n is connected to the first end of the switch S2, and the switches S21, S22, until the switch S2n controls whether the output voltage V2n of the corresponding battery optimizer BO2n is used. The second terminal of the switch S2 is connected to the first ac terminal 01 via an inductor L1, and the switch S2 controls whether to connect the output voltage of the second series battery pack 21 to the first terminal of the inductor L1.
The second end of the inductor L1 is connected to the first AC terminal 01, and the inductor L1 has a filtering function. The first series battery 11 and the second series battery 21 are connected in series, and the series midpoint thereof is connected to the second ac terminal 02. When the battery pack discharges, the switch S1 is switched on in the positive half cycle of the alternating current load, and a positive sine wave is obtained between the first alternating current end 01 and the second alternating current end 02 after filtering through the inductor L1; during the ac load half cycle, the switch S2 is turned on, and a negative sine wave is obtained between the first ac terminal 01 and the second ac terminal 02 after filtering through the inductor L1. When the battery pack is charged, the working principle is the same, and the electric energy flow direction is opposite.
A schematic circuit diagram of a first embodiment of the present invention is shown in fig. 3, and in this embodiment, 4 battery optimizers and 4 batteries are taken as an example for description. The first series battery 11 comprises 4 battery optimizers and 4 batteries, battery B11 is connected in parallel with a first end of battery optimizer BO11, battery B12 is connected in parallel with a first end of battery optimizer BO12, battery B13 is connected in parallel with a first end of battery optimizer BO13, battery B14 is connected in parallel with a first end of battery optimizer BO14, and battery optimizer BO11 is connected in series to a second end of battery optimizer BO 14. The battery optimizer performs charge and discharge management and battery series balance. The first switch circuit 12 includes 4 switches, one end of the switch S11 is connected to the positive electrode of the second end of the battery optimizer BO11, the other end of the switch S11 is connected to the first end of the switch S1, one end of the switch S12 is connected to the positive electrode of the second end of the battery optimizer BO12, the other end of the switch S12 is connected to the first end of the switch S1, one end of the switch S13 is connected to the positive electrode of the second end of the battery optimizer BO13, the other end of the switch S13 is connected to the first end of the switch S1, one end of the switch S14 is connected to the positive electrode of the second end of the battery optimizer BO14, the other end of the switch S14 is connected to the first end of the switch S1, and the output voltages V1n of the battery optimizer BO14, the switch S11, the switch S12, the switch S13 and the switch S14 control their corresponding switches BO11, the battery optimizer BO12, BO 13. The second terminal of the switch S1 is connected to the first ac terminal 01 via the inductor L1, and the switch S1 controls whether to connect the output voltage of the first series battery 11 to the first terminal of the inductor L1.
The second series battery pack 21 comprises 4 battery optimizers and 4 batteries, battery B21 is connected in parallel with the first end of battery optimizer BO21, battery B22 is connected in parallel with the first end of battery optimizer BO22, battery B23 is connected in parallel with the first end of battery optimizer BO23, battery B24 is connected in parallel with the first end of battery optimizer BO24, and battery optimizer BO21 is connected in series to the second end of battery optimizer BO 24. The battery optimizer performs charge and discharge management and battery series balance. The second switch circuit 22 includes 4 switches, one end of the switch S21 is connected to the negative electrode of the second end of the battery optimizer BO21, the other end of the switch S21 is connected to the first end of the switch S2, one end of the switch S22 is connected to the negative electrode of the second end of the battery optimizer BO22, the other end of the switch S22 is connected to the first end of the switch S2, one end of the switch S23 is connected to the negative electrode of the second end of the battery optimizer BO23, the other end of the switch S23 is connected to the first end of the switch S2, one end of the switch S24 is connected to the negative electrode of the second end of the battery optimizer BO24, the other end of the switch S24 is connected to the first end of the switch S2, and the switch S21, the switch S22, the switch S23 and the switch S24 control whether the output voltage V2n of the corresponding battery optimizer BO21, the battery optimizer BO22, the battery optimizer BO23 and the battery optimizer BO 5 is used. The second terminal of the switch S2 is connected to the first ac terminal 01 via the inductor L1, and the switch S2 controls whether to connect the output voltage of the second series battery pack 21 to the first terminal of the inductor L1.
The second end of the inductor L1 is connected to the first AC terminal 01, and the inductor L1 has a filtering function. The first series battery 11 and the second series battery 21 are connected in series, and the series midpoint thereof is connected to the second ac terminal 02. When the first ac terminal 01 and the second ac terminal 02 are connected in parallel to an ac load, the first series battery 11 and the second series battery 21 supply power to the ac load. When the first ac terminal 01 and the second ac terminal 02 are connected in parallel with an ac power source, the ac power source charges the first series battery 11 and the second series battery 21.
More specifically, the battery optimizer is a Buck-Boost circuit (Buck-Boost circuit), please refer to fig. 3, the battery optimizer BO11 includes a switch S111, a switch S112, a switch S113, a switch S114, and an inductor L11, the switch S111, the switch S112, the switch S113, the switch S114, and the inductor L11 are connected in a Buck-Boost manner, and the output end of the battery optimizer includes a capacitor. Similarly, the battery optimizers BO12, BO13, BO14, BO21, BO22, BO23, BO24 are also Buck-Boost circuits. Controlling the battery optimizer to work in a Boost working mode according to the requirement so as to increase the voltage of the battery; or controlling the battery optimizer to work in the Buck operation mode so as to reduce the battery voltage. A battery optimizer is arranged for each battery, and the battery optimizer is used for carrying out charge and discharge management on each battery, so that the problem of series unbalance of the batteries is solved.
FIG. 4 shows the driving voltage waveforms of the switch S11, the switch S12, the switch S13 and the switch S14 in FIG. 3, and the voltage waveform V between the first end and the second AC end 02 of the inductor L1 AC In fig. 4, the horizontal axis t represents time in milliseconds. At a voltage V AC In the positive half cycle, the switch S1 is turned on, the switch S14, the switch S13, the switch S12, the switch S11, the switch S11, the switch S12, the switch S13 and the switch S14 are turned on in turn, and the voltage V is AC A positive trapezoidal wave, switch S11 is turned on, and voltage V AC Equal to V11+ V12+ V13+ V14, switch S12 is turned on, and voltage V is applied AC Equal to V12+ V13+ V14, the switch S13 is turned on and the voltage V is set AC Equal to V13+ V14, switch S14 is turned on and voltage V is set AC Equal to V14; at a voltage V AC In the negative half cycle, the switch S2 is turned on, and the switch S21, the switch S22, the switch S23, the switch S24, the switch S24, the switch S23, the switch S22 and the switch S21 are turned on in turn, so that a trapezoidal wave with a negative value is obtained between the first end and the second alternating current end 02 of the inductor L1, such as the waveform V in fig. 4 AC Switch S21 is shown conducting, electricallyPressure V AC Equal to-V21, switch S22 is turned on, and voltage V AC Equal to-V21-V22, the switch S23 is turned on, and the voltage V is AC Equal to-V21-V22-V23, the switch S24 is turned on, and the voltage V is AC Equal to-V21-V22-V23-V24.
The battery pack charging and discharging device works in a discharging mode, an alternating current load is connected between a first alternating current end 01 and a second alternating current end 02 in parallel, the batteries B11-B24 supply power to the alternating current load, the switch S1 is turned on in the positive half cycle of the alternating current load, the switches S11-S14 are turned on in turn, trapezoidal waves are obtained at the first end of the inductor L1, and the specific time sequence is shown in FIG. 4; in the alternating current load half cycle, the switch S2 is conducted, and the switches S21-S24 are conducted in turn, so that trapezoidal waves are obtained at the first end of the inductor L1.
After filtering by the inductor L1, a sinusoidal ac voltage is obtained between the first ac terminal 01 and the second ac terminal 02, and the fundamental voltage value of the generated sinusoidal ac voltage can be adjusted in two ways. One way is to adjust the voltage V by controlling the pulse width of the switch S11, the switch S12, the switch S13, the switch S14, the switch S21, the switch S22, the switch S23, the switch S24 with the output voltage of each cell optimizer fixed AC A fundamental wave voltage value; alternatively, the voltage V may be adjusted by controlling the output voltage of each cell optimizer with the pulse widths of the switches S11, S12, S13, S14, S21, S22, S23, and S24 fixed AC The fundamental voltage value.
Since the sine wave is gradually approximated by the trapezoidal wave, if the order of the trapezoidal wave is too small, the inductance value of the inductor L1 is large, that is, the size of the inductor L1 is large. This problem can be solved by increasing the order of the trapezoidal wave and decreasing the output voltage of the cell optimizer.
When the alternating current frequency is 50Hz, the switching frequency of the switch S1 and the switch S2 is 50Hz, and the switching frequency of the switch S11, the switch S12, the switch S13, the switch S14, the switch S21, the switch S22, the switch S23 and the switch S24 is 100 Hz. The battery pack charging and discharging device has ultrahigh efficiency due to the low frequency of the switch.
The battery pack charging and discharging device works in a charging mode, an alternating current power supply is connected in parallel between a first alternating current end and a second alternating current end, the alternating current power supply charges the battery, a switch S1 is switched on in the positive half cycle of the alternating current power supply, a switch S11-S14 is selected to be switched on, a corresponding battery optimizer is connected in parallel with the alternating current power supply, the sum of the voltages of the input ends of the battery optimizer is close to the voltage instantaneous value of the alternating current power supply, the battery connected in parallel is charged, a switch S2 is switched on in the negative half cycle of the alternating current power supply, a switch S21-S24 is selected to be switched on, the corresponding battery optimizer is connected in parallel with the alternating current power supply, the sum of the voltages of the input ends of the battery optimizer is close to the voltage instantaneous value of the alternating current power supply, and the battery connected in parallel is charged. According to the instantaneous voltage value of the alternating current power supply, the switches S11-S14 are selectively turned on or the switches S21-S24 are selectively turned on, the voltage of the input end of the battery optimizer is ensured to be approximately unchanged, and the conversion efficiency of the battery optimizer is improved.
In a second embodiment of the present invention, please refer to fig. 5, the battery pack charging/discharging apparatus includes a first series battery pack 11, a switch S1, a second series battery pack 21, a switch S2, and an inductor L1. The first series stack 11 comprises at least 4 cell optimizers and at least 4 cells and the second series stack 21 comprises at least 4 cell optimizers and at least 4 cells. Fig. 5 shows a schematic circuit diagram of the first series battery 11 with 4 cell optimizers BO11 up to BO14 and 4 cells B11 up to B14, and the second series battery 21 with 4 cell optimizers BO21 up to BO24 and 4 cells B21 up to B24.
The first series battery 11 includes 4 battery optimizers and 4 batteries, the battery B11 is connected in parallel with the first end of the battery optimizer BO11, the positive terminal of the second end of the battery optimizer BO11 is connected with the first end of the switch S1, the battery B12 is connected in parallel with the first end of the battery optimizer BO12, the positive terminal of the second end of the battery optimizer BO12 is connected with the first end of the switch S1, the battery B13 is connected in parallel with the first end of the battery optimizer BO13, the positive terminal of the second end of the battery optimizer BO13 is connected with the first end of the switch S1, the battery B14 is connected in parallel with the first end of the battery optimizer BO14, the positive terminal of the second end of the battery optimizer BO14 is connected with the first end of the switch S1, and the battery optimizer BO11 is connected in series to the second end of the battery optimizer BO 14. The battery optimizer performs charge and discharge management and battery series balance. The second terminal of the switch S1 is connected to the first ac terminal 01 via the inductor L1, and the switch S1 controls whether to connect the output voltage of the first series battery 11 to the first terminal of the inductor L1.
The second series battery pack 21 comprises 4 battery optimizers and 4 batteries, the battery B21 is connected in parallel with the first end of the battery optimizer BO21, the negative electrode of the second end of the battery optimizer BO21 is connected with the first end of the switch S2, the battery B22 is connected in parallel with the first end of the battery optimizer BO22, the negative electrode of the second end of the battery optimizer BO22 is connected with the first end of the switch S2, the battery B23 is connected in parallel with the first end of the battery optimizer BO23, the negative electrode of the second end of the battery optimizer BO23 is connected with the first end of the switch S2, the battery B24 is connected in parallel with the first end of the battery optimizer BO24, the negative electrode of the second end of the battery optimizer BO24 is connected with the first end of the switch S2, and the battery optimizer BO21 is connected in series to the second end of the battery optimizer BO 24. The battery optimizer performs charge and discharge management and battery series balance. The second terminal of the switch S2 is connected to the first ac terminal 01 through the inductor L1, and the switch S2 controls whether to connect the output voltage of the second series battery pack 21 to the first terminal of the inductor L1.
The second end of the inductor L1 is connected to the first AC terminal 01, and the inductor L1 has a filtering function. The first series battery 11 and the second series battery 21 are connected in series, and the series midpoint thereof is connected to the second ac terminal 02. When the battery pack discharges, the switch S1 is switched on in the positive half cycle of the alternating current load, and a positive sine wave is obtained between the first alternating current end 01 and the second alternating current end 02 after filtering through the inductor L1; during the ac load half cycle, the switch S2 is turned on, and a negative sine wave is obtained between the first ac terminal 01 and the second ac terminal 02 after filtering through the inductor L1. When the battery pack is charged, the working principle is the same, and the electric energy flow direction is opposite.
More specifically, the battery optimizer is a Buck-Boost circuit (Buck-Boost circuit), please refer to fig. 5, the battery optimizer BO11 includes a switch S111, a switch S112, a switch S113, a switch S114, and an inductor L11, the switch S111, the switch S112, the switch S113, the switch S114, and the inductor L11 are connected in a Buck-Boost manner, and the output end of the battery optimizer includes a capacitor. Similarly, the battery optimizers BO12, BO13, BO14, BO21, BO22, BO23, BO24 are also Buck-Boost circuits. Controlling the battery optimizer to work in a Boost working mode according to the requirement so as to increase the voltage of the battery; or controlling the battery optimizer to work in the Buck operation mode so as to reduce the battery voltage. A battery optimizer is arranged for each battery, and the battery optimizer is used for carrying out charge and discharge management on each battery, so that the problem of series unbalance of the batteries is solved.
In the positive half cycle of the alternating current power supply, the switch S1 is switched on, the battery optimizers BO14, BO13, BO12, BO11, BO11, BO12, BO13 and BO14 work in turn and output direct current voltage, and a positive trapezoidal wave is obtained between the second end of the inductor L1 and the second alternating current end 02; in the negative half cycle of the alternating current power supply, the switch S2 is conducted, the battery optimizers BO21, BO22, BO23, BO24, BO24, BO23, BO22 and BO21 work in turn and output direct current voltage, and a negative trapezoidal wave is obtained between the second end of the inductor L1 and the second alternating current end 02. After filtering by the inductor L1, a sinusoidal ac voltage is obtained between the first ac terminal 01 and the second ac terminal 02.
The block diagram of the first embodiment of the three-phase battery pack charging and discharging device is shown in fig. 6, and the three-phase battery pack charging and discharging device 600 comprises a first series battery pack 11, a first switch circuit 12, a switch S1, a second series battery pack 21, a second switch circuit 22, a switch S2, an inductor L1, a third switch circuit 13, a switch S3, a fourth switch circuit 23, a switch S4, an inductor L2, a fifth switch circuit 14, a switch S5, a sixth switch circuit 24, a switch S6 and an inductor L3. The first series battery 11 provides a first group of direct-current voltages, and the first switch circuit 12 is connected in parallel with the first series battery 11, controls the output voltage of the first series battery 11 and generates a first phase of positive trapezoidal waves; the third switch circuit 13 is connected in parallel with the first series battery pack 11, and controls the output voltage of the first series battery pack 11 and generates a positive trapezoidal wave of a second phase; a fifth switching circuit 14 is connected in parallel with the first series battery 11, and controls the output voltage of the first series battery 11 and generates a positive trapezoidal wave of the third phase. The second series battery pack 21 supplies a second set of direct-current voltages, and the second switching circuit 22 is connected in parallel with the second series battery pack 21, controls the output voltage of the second series battery pack 21, and generates a negative trapezoidal wave of the first phase; a fourth switching circuit 23 connected in parallel to the second series battery pack 21, which controls the output voltage of the second series battery pack 21 and generates a negative trapezoidal wave of a second phase; a sixth switching circuit 24 is connected in parallel with the second series battery pack 21, and controls the output voltage of the second series battery pack 21 and generates a negative trapezoidal wave of the third phase. The output end of the first switch circuit 12 is connected to the first end of the inductor L1 through the switch S1, the output end of the second switch circuit 22 is connected to the first end of the inductor L1 through the switch S2, the second end of the inductor L1 is connected to the first alternating current end 01, the first series battery pack 11 is connected in series with the second series battery pack 21, and the series midpoint of the first series battery pack is connected to the second alternating current end 02; the output end of the third switch circuit 13 is connected to the first end of the inductor L2 through the switch S3, the output end of the fourth switch circuit 23 is connected to the first end of the inductor L2 through the switch S4, the second end of the inductor L2 is connected to the third ac terminal 03, and the series midpoint of the first series battery pack 11 and the second series battery pack 21 is connected to the fourth ac terminal 04; the output terminal of the fifth switch circuit 14 is connected to the first terminal of the inductor L3 through the switch S5, the output terminal of the sixth switch circuit 24 is connected to the first terminal of the inductor L3 through the switch S6, the second terminal of the inductor L3 is connected to the fifth ac terminal 05, and the series midpoint of the first series battery 11 and the second series battery 21 is connected to the sixth ac terminal 06. The first alternating current terminal 01, the third alternating current terminal 03 and the fifth alternating current terminal 05 are respectively a port of three-phase alternating current, and the second alternating current terminal 02, the fourth alternating current terminal 04 and the sixth alternating current terminal 06 are connected together to form a neutral point of the three-phase alternating current. The specific connection mode and operation principle of each phase circuit are the same as those of the first embodiment of the battery pack charging and discharging device in fig. 3, and are not described herein again.
Fig. 7 shows a block diagram of a second embodiment of a three-phase battery pack charging and discharging device 700, which includes a first series battery pack 11, a switch S1, a second series battery pack 21, a switch S2, an inductor L1, a third series battery pack 31, a switch S3, a fourth series battery pack 41, a switch S4, an inductor L2, a fifth series battery pack 51, a switch S5, a sixth series battery pack 61, a switch S6, and an inductor L3. The first series battery 11 provides a positive trapezoidal wave of the first phase and is connected to the first end of the inductor L1 through the switch S1, the second series battery 21 provides a negative trapezoidal wave of the first phase and is connected to the first end of the inductor L1 through the switch S2, the second end of the inductor L1 is connected to the first ac terminal 01, the first series battery 11 is connected in series with the second series battery 21, and the series midpoint thereof is connected to the second ac terminal 02; the third series battery pack 31 provides a positive trapezoidal wave of the second phase and is connected to the first terminal of the inductor L2 via the switch S3, the fourth series battery pack 41 provides a negative trapezoidal wave of the second phase and is connected to the first terminal of the inductor L2 via the switch S4, the second terminal of the inductor L2 is connected to the third ac terminal 03, the third series battery pack 31 is connected in series with the fourth series battery pack 41, and the series midpoint thereof is connected to the fourth ac terminal 04; the fifth series battery 51 provides a positive trapezoidal wave of the third phase and is connected to the first terminal of the inductor L3 through the switch S5, the sixth series battery 61 provides a negative trapezoidal wave of the third phase and is connected to the first terminal of the inductor L3 through the switch S6, the second terminal of the inductor L3 is connected to the fifth ac terminal 05, and the fifth series battery 51 is connected in series with the sixth series battery 61, and the series midpoint thereof is connected to the sixth ac terminal 06. The first alternating current terminal 01, the third alternating current terminal 03 and the fifth alternating current terminal 05 are respectively a port of three-phase alternating current, and the second alternating current terminal 02, the fourth alternating current terminal 04 and the sixth alternating current terminal 06 are connected together to form a neutral point of the three-phase alternating current. The specific connection mode and operation principle of each phase circuit are the same as those of the second embodiment of the battery pack charging and discharging device in fig. 5, and are not described herein again.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (28)

1. A battery pack charging and discharging device is characterized by comprising a first series battery pack, a first switch circuit, a first switch, a second series battery pack, a second switch circuit, a second switch and a first inductor, wherein the first series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the first switch circuit comprises a plurality of third switches, the first ends of the third switches are respectively connected with the positive electrode of the second end of the battery optimizers, the second ends of the third switches are connected with the first end of the first inductor through the first switch after being connected in parallel, the second series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first end of the battery optimizers in parallel, and the second ends of the battery optimizers are connected in series, the second switch circuit comprises a plurality of fourth switches, the first ends of the fourth switches are respectively connected with the negative poles of the second ends of the battery optimizers, the second ends of the fourth switches are connected in parallel and then connected to the first ends of the first inductors through the second switches, the second ends of the first inductors are connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and the second alternating current end is connected with the series midpoint of the first series battery pack and the second series battery pack.
2. The battery pack charging and discharging device according to claim 1, wherein the first series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries, and the second series battery pack includes at least 4 of the battery optimizers and at least 4 of the batteries.
3. The battery pack charging and discharging device according to claim 2, wherein the battery optimizer comprises a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second inductor, and the fifth switch, the sixth switch, the seventh switch, the eighth switch and the second inductor are connected in a Buck-Boost manner.
4. The battery pack charging and discharging device according to claim 3, wherein an ac load is connected in parallel between a first ac terminal and a second ac terminal, the battery supplies power to the ac load, the first switch is turned on during a positive half cycle of the ac load, and the plurality of third switches are turned on in turn, so that a trapezoidal wave is obtained at the first terminal of the first inductor; and in the alternating current load half cycle, the second switch is conducted, the plurality of fourth switches are conducted in turn, and the first end of the first inductor is provided with a trapezoidal wave.
5. The battery pack charge and discharge device according to claim 4, wherein the output voltage of the battery optimizer is stabilized, and the pulse width of the third switch or the fourth switch is changed.
6. The battery pack charge and discharge device according to claim 4, wherein the pulse width of the third switch or the fourth switch is fixed, and the output voltage of the battery optimizer varies.
7. The battery pack charge/discharge device according to claim 3, wherein an ac power supply for charging the battery is connected in parallel between a first ac terminal and a second ac terminal, the first switch is turned on during a positive half cycle of the ac power supply, the third switch is selectively turned on, a corresponding battery optimizer is connected in parallel with the ac power supply, and the battery connected in parallel is charged, and the second switch is turned on during a negative half cycle of the ac power supply, the fourth switch is selectively turned on, the corresponding battery optimizer is connected in parallel with the ac power supply, and the battery connected in parallel is charged.
8. A battery pack charging and discharging device is characterized by comprising a first series battery pack, a first switch, a second series battery pack, a second switch and a first inductor, wherein the first series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the anodes of the second ends of the battery optimizers of the first series battery pack are connected in parallel and then connected to the first end of the first inductor through the first switch, the second series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the cathodes of the second ends of the battery optimizers of the second series battery pack are connected in parallel and then connected to the first end of the first inductor through the second switch, the second end of the first inductor is connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and the second alternating current end is connected with the series midpoint of the first series battery pack and the second series battery pack.
9. The battery charging and discharging device according to claim 8, wherein said first series battery comprises at least 4 said cell optimizers and at least 4 said cells, and said second series battery comprises at least 4 said cell optimizers and at least 4 said cells.
10. The battery pack charging and discharging device according to claim 9, wherein the battery optimizer comprises a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second inductor, and the fifth switch, the sixth switch, the seventh switch, the eighth switch and the second inductor are connected in a Buck-Boost manner.
11. The battery pack charging and discharging device according to claim 10, wherein an ac load is connected in parallel between the first ac terminal and the second ac terminal, the battery supplies power to the ac load, the first switch is turned on during a positive half cycle of the ac load, the plurality of battery optimizers in the first series battery pack operate in turn to obtain a trapezoidal wave at the first terminal of the first inductor; and in the alternating current load half cycle, the second switch is conducted, the plurality of battery optimizers in the second series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor.
12. The battery pack charge and discharge device according to claim 11, wherein the output voltage of the battery optimizer is stable, and the operation time period of the battery optimizer is changed.
13. The battery pack charge and discharge device according to claim 11, wherein the operation time period of the battery optimizer is fixed, and the output voltage of the battery optimizer varies.
14. The battery pack charge/discharge device according to claim 10, wherein an ac power supply is connected in parallel between a first ac terminal and a second ac terminal, the ac power supply charges the battery, the first switch is turned on during a positive half cycle of the ac power supply, some of the battery optimizers connected thereto are selected to operate, the corresponding battery optimizers are connected in parallel with the ac power supply and charge the battery connected in parallel therewith, and the second switch is turned on during a negative half cycle of the ac power supply, some of the battery optimizers connected thereto are selected to operate, the corresponding battery optimizers are connected in parallel with the ac power supply, and the battery connected in parallel therewith is charged.
15. The three-phase battery pack charging and discharging device is characterized by comprising a first series battery pack, a first switch circuit, a first switch, a second series battery pack, a second switch circuit, a second switch, a first inductor, a third switch circuit, a ninth switch, a fourth switch circuit, a tenth switch, a third inductor, a fifth switch circuit, an eleventh switch, a sixth switch circuit, a twelfth switch and a fourth inductor, wherein the first series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the first switch circuit comprises a plurality of third switches, the third switch circuit comprises a plurality of thirteenth switches, the fifth switch circuit comprises a plurality of fourteenth switches, and the first end of the third switch, the first end of the thirteenth switch, the second end of the thirteenth switch, the first end of the tenth switch, the third switch, the twelfth switch and the thirteenth switch, The first end of the fourteenth switch is respectively connected with the positive electrode of the second end of the battery optimizer, the second ends of the plurality of third switches are connected in parallel and then connected to the first end of the first inductor through the first switch, the second ends of the plurality of thirteenth switches are connected in parallel and then connected to the first end of the third inductor through the ninth switch, the second ends of the plurality of fourteenth switches are connected in parallel and then connected to the first end of the fourth inductor through the eleventh switch, the second series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected in parallel with the first end of the battery optimizer, the second ends of the plurality of battery optimizers are connected in series, the second switch circuit comprises a plurality of fourth switches, the fourth switch circuit comprises a plurality of fifteenth switches, and the sixth switch circuit comprises a plurality of sixteenth switches, a first end of the fourth switch, a first end of the fifteenth switch, and a first end of the sixteenth switch are respectively connected to a negative electrode of a second end of the battery optimizer, a second end of the plurality of fourth switches are connected in parallel and then connected to a first end of the first inductor through the second switch, a second end of the plurality of fifteenth switches are connected in parallel and then connected to a first end of the third inductor through the tenth switch, a second end of the plurality of sixteenth switches are connected in parallel and then connected to a first end of the fourth inductor through the twelfth switch, a second end of the first inductor is connected to a first ac end, a second end of the third inductor is connected to a third ac end, a second end of the fourth inductor is connected to a fifth ac end, the first series battery pack and the second series battery pack are connected in series, a second ac end, a fourth ac end, and a sixth ac end are connected to a series midpoint of the first series battery pack and the second series battery pack, the first alternating current end, the third alternating current end and the fifth alternating current end are respectively a port of three-phase alternating current, and the second alternating current end, the fourth alternating current end and the sixth alternating current end are connected together to form a neutral point of the three-phase alternating current.
16. The three-phase battery pack charging and discharging device as claimed in claim 15, wherein said first series battery pack includes at least 4 of said battery optimizers and at least 4 of said batteries, and said second series battery pack includes at least 4 of said battery optimizers and at least 4 of said batteries.
17. The three-phase battery pack charging and discharging device according to claim 16, wherein the battery optimizer comprises a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second inductor, and the fifth switch, the sixth switch, the seventh switch, the eighth switch and the second inductor are connected in a Buck-Boost manner.
18. The three-phase battery pack charging and discharging device according to claim 17, wherein a three-phase ac load is connected in parallel between the first to sixth ac terminals, the first switch is turned on during a positive half cycle of the first ac load, and a plurality of the third switches are turned on in turn, so that a trapezoidal wave is obtained at the first terminal of the first inductor; in the negative half cycle of the first-phase alternating current load, the second switch is conducted, the plurality of fourth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the positive half cycle of the second-phase alternating current load, the ninth switch is conducted, the thirteenth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the third inductor; in a second-phase alternating current load half cycle, the tenth switch is conducted, the fifteenth switches are conducted in turn, and trapezoidal waves are obtained at the first end of the third inductor; in the positive half cycle of the third-phase alternating-current load, the eleventh switch is turned on, the fourteenth switches are turned on in turn, and trapezoidal waves are obtained at the first end of the fourth inductor; and in the negative half cycle of the third-phase alternating-current load, the twelfth switch is conducted, the sixteenth switches are conducted in turn, and the first end of the fourth inductor is provided with a trapezoidal wave.
19. The three-phase battery pack charging and discharging device as claimed in claim 18, wherein the output voltage of the battery optimizer is stable, and the pulse width of the third switch or the fourth switch or the thirteenth switch or the fourteenth switch or the fifteenth switch or the sixteenth switch is varied.
20. The three-phase battery pack charging and discharging device as claimed in claim 18, wherein the pulse width of the third switch or the fourth switch or the thirteenth switch or the fourteenth switch or the fifteenth switch or the sixteenth switch is fixed, and the output voltage of the battery optimizer is varied.
21. The three-phase battery pack charging and discharging device according to claim 17, wherein a three-phase ac power supply is connected in parallel between the first to sixth ac terminals, the first switch is turned on during a positive half cycle of the first ac power supply, the third switch is selectively turned on, and a corresponding battery optimizer is connected in parallel with the first ac power supply; in the negative half cycle of the first alternating current power supply, the second switch is conducted, the fourth switch is conducted selectively, and the corresponding battery optimizer is connected with the first alternating current power supply in parallel; in the positive half cycle of the second-phase alternating-current power supply, the ninth switch is switched on, the thirteenth switch is selectively switched on, and the corresponding battery optimizer is connected with the second-phase alternating-current power supply in parallel; in the negative half cycle of the second-phase alternating-current power supply, the tenth switch is turned on, the fifteenth switch is selected, and the corresponding battery optimizer is connected with the second-phase alternating-current power supply in parallel; in the positive half cycle of a third-phase alternating-current power supply, the eleventh switch is conducted, the fourteenth switch is conducted selectively, and the corresponding battery optimizer is connected with the third-phase alternating-current power supply in parallel; and in the negative half cycle of the third-phase alternating-current power supply, the twelfth switch is conducted, the sixteenth switch is conducted selectively, and the corresponding battery optimizer is connected with the third-phase alternating-current power supply in parallel.
22. A three-phase battery pack charging and discharging device is characterized by comprising a first series battery pack, a first switch, a second series battery pack, a second switch, a first inductor, a third series battery pack, a ninth switch, a fourth series battery pack, a tenth switch, a third inductor, a fifth series battery pack, an eleventh switch, a sixth series battery pack, a twelfth switch and a fourth inductor, wherein the first series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the anodes of the second ends of the plurality of battery optimizers of the first series battery pack are connected with each other in parallel and then connected to the first end of the first inductor through the first switch, the second series battery pack comprises a plurality of battery optimizers and a plurality of batteries, and the batteries are respectively connected with the first ends of the battery optimizers in parallel, second ends of the plurality of battery optimizers are connected in series, cathodes of the second ends of the plurality of battery optimizers in the second series battery pack are connected in parallel and then connected to a first end of the first inductor through the second switch, a second end of the first inductor is connected with a first alternating current end, the first series battery pack and the second series battery pack are connected in series, and a second alternating current end is connected with a series midpoint of the first series battery pack and the second series battery pack; the third series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the anodes of the second ends of the battery optimizers of the third series battery pack are connected in parallel and then connected to the first end of the third inductor through the ninth switch, the fourth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the battery optimizers are connected in series, the cathodes of the second ends of the battery optimizers of the fourth series battery pack are connected in parallel and then connected to the first end of the third inductor through the tenth switch, the second end of the third inductor is connected with a third alternating current end, and the third series battery pack and the fourth series battery pack are connected in series, the fourth alternating current end is connected with the series midpoint of the third series battery pack and the fourth series battery pack; the fifth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the anodes of the second ends of the plurality of battery optimizers of the fifth series battery pack are connected in parallel and then connected to the first end of the fourth inductor through the eleventh switch, the sixth series battery pack comprises a plurality of battery optimizers and a plurality of batteries, the batteries are respectively connected with the first ends of the battery optimizers in parallel, the second ends of the plurality of battery optimizers are connected in series, the cathodes of the second ends of the plurality of battery optimizers of the sixth series battery pack are connected in parallel and then connected to the first end of the fourth inductor through the twelfth switch, the second end of the fourth inductor is connected with the fifth alternating current end, and the fifth series battery pack and the sixth series battery pack are connected in series, the sixth alternating current end is connected with the series midpoint of the fifth series battery pack and the sixth series battery pack; the first alternating current end, the third alternating current end and the fifth alternating current end are respectively a port of three-phase alternating current, and the second alternating current end, the fourth alternating current end and the sixth alternating current end are connected together to form a neutral point of the three-phase alternating current.
23. The three-phase battery pack charging and discharging device as claimed in claim 22, wherein the first, second, third, fourth, fifth and sixth series battery packs respectively include at least 4 of the battery optimizers and at least 4 of the batteries.
24. The three-phase battery pack charging and discharging device according to claim 23, wherein the battery optimizer comprises a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second inductor, and the fifth switch, the sixth switch, the seventh switch, the eighth switch and the second inductor are connected in a Buck-Boost manner.
25. The three-phase battery pack charging and discharging device as claimed in claim 24, wherein a three-phase ac load is connected in parallel between the first to sixth ac terminals, the first switch is turned on during a positive half cycle of the first ac load, the plurality of battery optimizers in the first series battery pack operate in turn to obtain a trapezoidal wave at the first terminal of the first inductor; in the negative half cycle of the first-phase alternating-current load, the second switch is conducted, the plurality of battery optimizers in the second series battery pack work in turn, and trapezoidal waves are obtained at the first end of the first inductor; in the positive half cycle of the second-phase alternating current load, the ninth switch is conducted, the plurality of battery optimizers in the third series battery pack work in turn, and trapezoidal waves are obtained at the first end of the third inductor; in a second phase alternating current load half cycle, the tenth switch is conducted, the plurality of battery optimizers in the fourth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the third inductor; in the positive half cycle of the third-phase alternating-current load, the eleventh switch is turned on, the plurality of battery optimizers in the fifth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the fourth inductor; and in the negative half cycle of the third-phase alternating-current load, the twelfth switch is switched on, the plurality of battery optimizers in the sixth series battery pack work in turn, and trapezoidal waves are obtained at the first end of the fourth inductor.
26. The three-phase battery pack charging and discharging device as claimed in claim 25, wherein the output voltage of the battery optimizer is stabilized, and the operation time of the battery optimizer is varied.
27. The three-phase battery pack charging and discharging device as claimed in claim 25, wherein the operation time of the battery optimizer is fixed, and the output voltage of the battery optimizer is varied.
28. The three-phase battery pack charging and discharging device according to claim 24, wherein a three-phase ac power supply is connected in parallel between the first to sixth ac terminals, and the first switch is turned on during a positive half cycle of the first ac power supply to select some of the battery optimizers connected thereto to operate, and the corresponding battery optimizers are connected in parallel with the first ac power supply; in the negative half cycle of the first alternating current power supply, the second switch is conducted, certain battery optimizers connected with the second switch are selected to work, and the corresponding battery optimizers are connected with the first alternating current power supply in parallel; in the positive half cycle of the second-phase alternating-current power supply, the ninth switch is conducted, certain battery optimizers connected with the ninth switch are selected to work, and the corresponding battery optimizers are connected with the second-phase alternating-current power supply in parallel; in the negative half cycle of the second-phase alternating-current power supply, the tenth switch is conducted, certain battery optimizers connected with the tenth switch are selected to work, and the corresponding battery optimizers are connected with the second-phase alternating-current power supply in parallel; in the positive half cycle of the third-phase alternating-current power supply, the eleventh switch is conducted, certain battery optimizers connected with the eleventh switch are selected to work, and the corresponding battery optimizers are connected with the third-phase alternating-current power supply in parallel; and in the negative half cycle of the third-phase alternating-current power supply, the twelfth switch is conducted, certain battery optimizers connected with the twelfth switch are selected to work, and the corresponding battery optimizers are connected with the third-phase alternating-current power supply in parallel.
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CN107215221A (en) * 2017-05-22 2017-09-29 惠州亿纬锂能股份有限公司 Series-connected cell distribution type active nondissipative equalization circuit, battery pack and automobile
CN208046259U (en) * 2018-02-05 2018-11-02 江门市敏华电器有限公司 A kind of active equalization circuit of series-connected batteries
CN110011365A (en) * 2018-01-05 2019-07-12 杭州科工电子科技有限公司 The equal balance system of energy-storage battery group

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107215221A (en) * 2017-05-22 2017-09-29 惠州亿纬锂能股份有限公司 Series-connected cell distribution type active nondissipative equalization circuit, battery pack and automobile
CN110011365A (en) * 2018-01-05 2019-07-12 杭州科工电子科技有限公司 The equal balance system of energy-storage battery group
CN208046259U (en) * 2018-02-05 2018-11-02 江门市敏华电器有限公司 A kind of active equalization circuit of series-connected batteries

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