CN110336340B - Lithium battery charging system and working method - Google Patents
Lithium battery charging system and working method Download PDFInfo
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- CN110336340B CN110336340B CN201910400213.6A CN201910400213A CN110336340B CN 110336340 B CN110336340 B CN 110336340B CN 201910400213 A CN201910400213 A CN 201910400213A CN 110336340 B CN110336340 B CN 110336340B
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention relates to a lithium battery charging system and a working method thereof, wherein the lithium battery charging system comprises: the charging device comprises a voltage-multiplying charging unit, a charger and a lithium battery pack, wherein the charger is electrically connected with the voltage-multiplying charging unit; the charging machine is suitable for providing input voltage, and the voltage-multiplying charging unit is suitable for charging the lithium battery pack after adjusting the voltage level of the input voltage; the lithium battery pack is also suitable for supplying voltage to a direct current bus of the charger through the voltage-multiplying charging unit; according to the invention, the lithium battery pack is charged after the voltage grade of the input voltage is adjusted, and the lithium battery pack is connected with the direct current bus of the charger for energy mutual current, so that the charging range of the charger is fully utilized, and the use cost is saved while the practicability is improved; mutual support of energy is realized, and reliability and stability are improved; and voltage output of various voltage grades is realized so as to deal with the power lithium battery pack with various voltage grades.
Description
Technical Field
The invention relates to the field of lithium battery energy, in particular to a lithium battery charging system and a working method.
Background
The subway vehicle takes electric energy as power energy. In the construction and operation stages of the subway, although the safety and reliability of traction power supply are paid sufficient attention, the short-time interruption or long-time paralysis of the power supply of the subway vehicle can not be avoided. At the moment, the subway vehicle cannot be started normally, and subway operators basically adopt engineering maintenance vehicles to rescue and drag the subway vehicle to the next platform. But the whole process takes tens of minutes at the fastest, so that the delay of other operating vehicles can be caused.
In order to avoid influencing the subsequent operation of the subway vehicles. Some host plants add emergency traction functionality to subway vehicles, increasing the DC110V battery capacity, and even individually equip powered lithium batteries for battery traction. When the subway train is in an emergency, the subway train is automatically and emergently dragged to the next platform, so that passengers can safely evacuate.
However, the power lithium battery pack is generally charged by using a separate charging device, but the charging device is used for a small number of times, the replaceability of the charging unit is poor, one voltage class corresponds to one charging device, and the power lithium battery pack and the storage battery unit are not interconnected, so that the number of times of using the power lithium battery pack is undoubtedly reduced.
Therefore, it is desirable to develop a new lithium battery charging system and a working method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a lithium battery charging system and a working method.
In order to solve the above technical problem, the present invention provides a lithium battery charging system, including: the charging device comprises a voltage-multiplying charging unit, a charger and a lithium battery pack, wherein the charger is electrically connected with the voltage-multiplying charging unit; the charging machine is suitable for providing input voltage, and the voltage-multiplying charging unit is suitable for charging the lithium battery pack after adjusting the voltage level of the input voltage; the lithium battery pack is also suitable for supplying voltage to a direct current bus of the charger through the voltage-multiplying charging unit.
Further, the voltage-multiplying charging unit includes: the DC/DC isolation converter is connected with the output end of the charger, and the voltage-multiplying conversion module is connected with the DC/DC isolation converter; and the output end of the voltage-multiplying conversion module is connected with the lithium battery pack.
Further, the voltage-multiplying charging unit includes: two DC/DC isolation converters which are arranged in parallel are connected with the output end of the charger; and voltage-multiplying conversion modules respectively connected with the two DC/DC isolation converters; the output ends of the two voltage doubling conversion modules are connected in series and then connected with the lithium battery pack.
Further, the voltage-multiplying charging unit includes: a voltage doubling conversion module; the voltage-multiplying transformation module comprises: the first-stage voltage-multiplying module, the second-stage voltage-multiplying module and the third-stage voltage-multiplying module; the first-stage voltage doubling module is suitable for performing first-stage voltage doubling on input voltage; the second-stage voltage doubling module is suitable for being connected with the first-stage voltage doubling module so as to carry out second-stage voltage doubling on the voltage subjected to first-stage voltage doubling; the third-stage voltage doubling module is suitable for being connected with the second-stage voltage doubling module so as to output the voltage subjected to the second-stage voltage doubling to the lithium battery pack after the third-stage voltage doubling.
Further, the first stage voltage doubling module comprises: a voltage doubler circuit; the voltage doubling circuit comprises: the input inductor, the half-bridge IGBT unit and the bus capacitor are connected; one end of the input inductor is connected with the midpoint of the half-bridge IGBT unit, and the other end of the input inductor is used as an input end; and the bus capacitor is connected with the two output ends of the half-bridge IGBT unit in parallel.
Further, the second-stage voltage-multiplying module comprises two voltage-multiplying circuits; two output ends of a half-bridge IGBT unit in the first-stage voltage doubling module are respectively connected with an input inductor of a voltage doubling circuit in the second-stage voltage doubling module; the two voltage doubling circuits form three output ends, namely one output end of each voltage doubling circuit is combined to serve as a common output end, and bus capacitors are connected in parallel between the two output ends respectively.
Further, the third-stage voltage-multiplying module comprises three voltage-multiplying circuits; three output ends of the second-stage voltage doubling module are respectively connected with input inductors of a triple voltage circuit in the third-stage voltage doubling module; the three voltage doubling circuits form two output ends to be connected with the lithium battery pack.
Further, the lithium battery charging system also comprises a control module; the control module is suitable for controlling the on-off of the corresponding half-bridge IGBT unit in each stage of voltage doubling module to change the amplification factor of the corresponding voltage doubling module and the phase difference of the output voltage of each stage of voltage doubling module.
In another aspect, the present invention provides a working method of a lithium battery charging system, including: adjusting the voltage grade of the input voltage to charge the lithium battery pack; and the lithium battery pack supplies voltage to a direct current bus of the charger.
The working method is suitable for charging the lithium battery pack by the charger by adopting the lithium battery charging system.
The charging device has the advantages that the lithium battery pack is charged after the voltage grade of the input voltage is adjusted, and the lithium battery pack is connected with the direct current bus of the charging machine for energy mutual current, so that the charging range of the charging machine is fully utilized, the practicability is improved, and the use cost is saved; mutual support of energy is realized, and reliability and stability are improved; and voltage output of various voltage grades is realized so as to deal with the power lithium battery pack with various voltage grades.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a functional block diagram of a lithium battery charging system of the present invention;
FIG. 2 is a functional block diagram of another embodiment of a lithium battery charging system of the present invention;
FIG. 3 is a circuit diagram of the voltage doubler transform module of the present invention;
FIG. 4 is a driving waveform diagram of each stage of the voltage doubling module according to the present invention;
fig. 5 is a flow chart of a method of operating a lithium battery charging system of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1
Fig. 1 is a schematic block diagram of a lithium battery charging system of the present invention.
In this embodiment, as shown in fig. 1, the present embodiment provides a lithium battery charging system, which includes: the charging device comprises a voltage-multiplying charging unit, a charger and a lithium battery pack, wherein the charger is electrically connected with the voltage-multiplying charging unit; the charging machine is suitable for providing input voltage, and the voltage-multiplying charging unit is suitable for charging the lithium battery pack after adjusting the voltage level of the input voltage; the lithium battery pack is also suitable for supplying voltage to a direct current bus of the charger through the voltage-multiplying charging unit.
In the embodiment, the lithium battery pack is charged after the voltage level of the input voltage is adjusted, and the lithium battery pack is connected with the direct current bus of the charger to perform energy mutual current, so that the charging range of the charger is fully utilized, the practicability is improved, and the use cost is saved; mutual support of energy is realized, and reliability and stability are improved; and voltage output of various voltage grades is realized so as to deal with the power lithium battery pack with various voltage grades.
In order to perform bidirectional transmission of electric energy, the voltage-multiplying charging unit includes: the DC/DC isolation converter is connected with the output end of the charger, and the voltage-multiplying conversion module is connected with the DC/DC isolation converter; and the output end of the voltage-multiplying conversion module is connected with the lithium battery pack.
Fig. 2 is a schematic block diagram of another embodiment of a lithium battery charging system of the present invention.
In order to charge lithium battery packs with different voltage levels, as shown in fig. 2, the voltage-doubling charging unit includes: two DC/DC isolation converters which are arranged in parallel are connected with the output end of the charger; and voltage-multiplying conversion modules respectively connected with the two DC/DC isolation converters; the output ends of the two voltage doubling conversion modules are connected in series and then connected with the lithium battery pack.
In this embodiment, the output ends of the two voltage doubling conversion modules are connected in series and then connected with the lithium battery pack through the voltage doubling conversion modules respectively connected with the two DC/DC isolation converters, so that voltage output of various voltage levels is realized, and the power lithium battery pack can cope with various voltage levels.
Fig. 3 is a circuit diagram of the voltage-doubler conversion module of the present invention.
In order to perform voltage-doubling output, as shown in fig. 3, the voltage-doubling charging unit includes: a voltage doubling conversion module; the voltage-multiplying transformation module comprises: the first-stage voltage-multiplying module, the second-stage voltage-multiplying module and the third-stage voltage-multiplying module; the first-stage voltage doubling module is suitable for performing first-stage voltage doubling on input voltage; the second-stage voltage doubling module is suitable for being connected with the first-stage voltage doubling module so as to carry out second-stage voltage doubling on the voltage subjected to first-stage voltage doubling; the third-stage voltage doubling module is suitable for being connected with the second-stage voltage doubling module so as to output the voltage subjected to the second-stage voltage doubling to the lithium battery pack after the third-stage voltage doubling.
Specifically, the first stage voltage doubling module includes: a voltage doubler circuit; the voltage doubling circuit comprises: the input inductor, the half-bridge IGBT unit and the bus capacitor are connected; one end of the input inductor is connected with the midpoint of the half-bridge IGBT unit, and the other end of the input inductor is used as an input end; and the bus capacitor is connected with the two output ends of the half-bridge IGBT unit in parallel.
Specifically, the second-stage voltage-multiplying module comprises two voltage-multiplying circuits; two output ends of a half-bridge IGBT unit in the first-stage voltage doubling module are respectively connected with an input inductor of a voltage doubling circuit in the second-stage voltage doubling module; the two voltage doubling circuits form three output ends, namely one output end of each voltage doubling circuit is combined to serve as a common output end, and bus capacitors are connected in parallel between the two output ends respectively.
Specifically, the third-stage voltage-multiplying module comprises three voltage-multiplying circuits; three output ends of the second-stage voltage doubling module are respectively connected with input inductors of a triple voltage circuit in the third-stage voltage doubling module; the three voltage doubling circuits form two output ends to be connected with the lithium battery pack.
Fig. 4 is a driving waveform diagram of each stage of voltage doubling module according to the present invention.
In this embodiment, as shown in fig. 4, the half-bridge IGBT unit driving waveforms in the first stage voltage-multiplying module, the second stage voltage-multiplying module, and the third stage voltage-multiplying module have a difference of 120 degrees respectively; the driving waveform of the half-bridge IGBT unit in the first-stage voltage doubling module is waveform A, the driving waveform of the half-bridge IGBT unit in the second-stage voltage doubling module is waveform B, and the driving waveform of the half-bridge IGBT unit in the third-stage voltage doubling module is waveform C.
In this embodiment, the charger inputs a voltage value U1 from the Ui terminal of the voltage-doubling conversion module.
In this embodiment, the first stage voltage doubling module completes charging the capacitor C1, and the charging loop is: the input voltage passes through an inductor L1, an anti-parallel diode VT1, a capacitor C1, an inductor L3, an anti-parallel diode VT6, an inductor L6 and an anti-parallel diode VT 12.
In this embodiment, the second stage voltage doubling module completes charging of the capacitor C2 and the capacitor C3, the capacitor C2 is charged by the capacitor C1, the potential of the negative terminal of the capacitor C1 becomes U1, the potential of the positive terminal of the capacitor C1 becomes 2U1 due to the conduction of the anti-parallel diode VT2, and the loop of the capacitor C2 is: the input voltage passes through an inductor L2, an anti-parallel diode VT3, a capacitor C2, an anti-parallel diode VT5 and an inductor L3; after the capacitor C2 is fully charged, the voltage value at two ends is U1, and the potential at the negative end of the capacitor C2 is U1; the charging of the capacitor C3 is completed by the front-end power supply, and the charging loop is: the sum of the voltage values of the capacitor C2 and the capacitor C3 after charging is 2U1 after the input voltage passes through the inductor L1, the anti-parallel diode VT2, the inductor L3, the anti-parallel diode VT5, the capacitor C3, the inductor L6 and the anti-parallel diode VT 12.
In this embodiment, the output voltage value of the output terminal Uo of the third stage voltage doubling module is 3U1, the charging of the capacitor C4, the capacitor C5 and the capacitor C6 is completed, the charging of the capacitor C4 is completed by the capacitor C2, and the charging loop is: the input voltage passes through an inductor L4, an anti-parallel diode VT7, a capacitor C4, an anti-parallel diode VT9 and an inductor L5; after the capacitor C4 is fully charged, the voltage value at two ends is U1, and the potential at the negative end is 2U 1; the charging of the capacitor C5 is completed by the capacitor C3, and the charging loop is: the input voltage passes through an inductor L5, an anti-parallel diode VT9, a capacitor C5, an anti-parallel diode VT11 and an inductor L6; after the capacitor C5 is fully charged, the voltage value at two ends is U1, and the potential at the negative end is U1; the charging of the capacitor C6 is completed by the front-end power supply, and the charging loop is: the input voltage passes through an inductor L1, an anti-parallel diode VT2, an inductor L3, an anti-parallel diode VT6, an inductor L6, an anti-parallel diode VT11 and a capacitor C6.
In this embodiment, the third-stage voltage-multiplying module may be further connected to a charger, and the first-stage voltage-multiplying module is connected to the lithium battery pack, so as to realize reverse voltage-multiplying.
Specifically, the lithium battery charging system further comprises a control module; the control module is suitable for controlling the on-off of the corresponding half-bridge IGBT unit in each stage of voltage doubling module to change the amplification factor of the corresponding voltage doubling module and the phase difference of the output voltage of each stage of voltage doubling module.
Example 2
Fig. 5 is a flow chart of a method of operating a lithium battery charging system of the present invention.
On the basis of embodiment 1, this embodiment provides an operating method of a lithium battery charging system, as shown in fig. 5, which includes: adjusting the voltage grade of the input voltage to charge the lithium battery pack; and the lithium battery pack supplies voltage to a direct current bus of the charger.
Specifically, the working method is suitable for charging the lithium battery pack by the charger by using the lithium battery charging system provided in embodiment 1.
In the present embodiment, the lithium battery charging system has been explained in the above embodiments.
In order to charge lithium battery packs with different voltage levels, the working method further comprises the following steps: the lithium battery charging systems are connected in series to charge lithium battery packs with different voltage levels.
In conclusion, the lithium battery pack is charged after the voltage grade of the input voltage is adjusted, and the lithium battery pack is connected with the direct current bus of the charger to carry out energy mutual current, so that the charging range of the charger is fully utilized, the practicability is improved, and the use cost is saved; mutual support of energy is realized, and reliability and stability are improved; and voltage output of various voltage grades is realized so as to deal with the power lithium battery pack with various voltage grades.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A lithium battery charging system, comprising:
the charging device comprises a voltage-multiplying charging unit, a charger and a lithium battery pack, wherein the charger is electrically connected with the voltage-multiplying charging unit; wherein
The charger is suitable for providing input voltage, and the voltage-multiplying charging unit is suitable for charging the lithium battery pack after adjusting the voltage level of the input voltage;
the lithium battery pack is also suitable for supplying voltage to a direct current bus of the charger through the voltage-multiplying charging unit;
the voltage-multiplying charging unit includes: a voltage doubling conversion module;
the voltage-multiplying transformation module comprises: the first-stage voltage-multiplying module, the second-stage voltage-multiplying module and the third-stage voltage-multiplying module;
the first-stage voltage doubling module is suitable for performing first-stage voltage doubling on input voltage;
the second-stage voltage doubling module is suitable for being connected with the first-stage voltage doubling module so as to carry out second-stage voltage doubling on the voltage subjected to first-stage voltage doubling;
the third-stage voltage doubling module is suitable for being connected with the second-stage voltage doubling module so as to output the voltage subjected to the second-stage voltage doubling to the lithium battery pack after the third-stage voltage doubling;
the first stage voltage doubling module comprises: a voltage doubler circuit;
the voltage doubling circuit comprises: the input inductor, the half-bridge IGBT unit and the bus capacitor are connected; wherein
One end of the input inductor is connected with the midpoint of the half-bridge IGBT unit, and the other end of the input inductor is used as an input end;
the bus capacitor is connected with the two output ends of the half-bridge IGBT unit in parallel;
the second-stage voltage-multiplying module comprises two voltage-multiplying circuits;
two output ends of a half-bridge IGBT unit in the first-stage voltage doubling module are respectively connected with an input inductor of a voltage doubling circuit in the second-stage voltage doubling module;
corresponding half-bridge IGBT units in the voltage doubling circuit are arranged in the same direction, one output end of each half-bridge IGBT unit is combined to serve as a common output end, and corresponding bus capacitors are connected in parallel between the common output end and the two remaining non-common output ends respectively.
2. The lithium battery charging system of claim 1,
the voltage-multiplying charging unit includes: the DC/DC isolation converter is connected with the output end of the charger, and the voltage-multiplying conversion module is connected with the DC/DC isolation converter;
and the output end of the voltage-multiplying conversion module is connected with the lithium battery pack.
3. The lithium battery charging system of claim 1,
the voltage-multiplying charging unit includes: two DC/DC isolation converters which are arranged in parallel are connected with the output end of the charger; and
two voltage doubling conversion modules respectively connected with the two DC/DC isolation converters;
the output ends of the two voltage doubling conversion modules are connected in series and then connected with the lithium battery pack.
4. The lithium battery charging system of claim 1,
the third-stage voltage-multiplying module comprises three voltage-multiplying circuits;
the three output ends of the second-stage voltage doubling module are respectively connected with input inductors of three voltage doubling circuits in the third-stage voltage doubling module;
corresponding half-bridge IGBT units in the three voltage doubling circuits are arranged in the same direction, the common output end of the third-stage voltage doubling module and the second-stage voltage doubling module is connected with the corresponding voltage doubling circuit, and two output ends of the half-bridge IGBT units in the voltage doubling circuit are respectively combined with the corresponding output ends of the rest half-bridge IGBT units to serve as the common output end, namely
The three voltage doubling circuits form four output ends, and corresponding bus capacitors are respectively connected in parallel between the two common output ends and the corresponding non-common output ends and between the two common output ends; and
the two non-common output ends are connected with the lithium battery pack.
5. The lithium battery charging system of claim 1,
the lithium battery charging system also comprises a control module;
the control module is suitable for controlling the on-off of the corresponding half-bridge IGBT units in each stage of voltage doubling module so as to change the amplification factor of the corresponding voltage doubling module and the phase difference of the output voltage of each stage of voltage doubling module.
6. A working method of a lithium battery charging system is characterized by comprising the following steps:
adjusting the voltage grade of the input voltage to charge the lithium battery pack;
a lithium battery pack supplies voltage to a direct current bus of the charger;
the working method is suitable for charging the lithium battery pack by the charger by adopting the lithium battery charging system as claimed in any one of claims 1 to 5.
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| CN108749578A (en) * | 2018-09-25 | 2018-11-06 | 新誉轨道交通科技有限公司 | Emergent draft gear and emergency vehicle trailer system |
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| US9413268B2 (en) * | 2012-05-10 | 2016-08-09 | Futurewei Technologies, Inc. | Multilevel inverter device and method |
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| CN105915047A (en) * | 2016-05-06 | 2016-08-31 | 上海交通大学 | Novel direct current boosted circuit |
| CN107745717A (en) * | 2017-11-03 | 2018-03-02 | 中车株洲电力机车有限公司 | Track traffic hybrid power system control circuit, rail traffic vehicles and its method of supplying power to |
| CN108749578A (en) * | 2018-09-25 | 2018-11-06 | 新誉轨道交通科技有限公司 | Emergent draft gear and emergency vehicle trailer system |
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