CN107968446B - Distributed battery pack power supply system and charge-discharge control method - Google Patents

Distributed battery pack power supply system and charge-discharge control method Download PDF

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Publication number
CN107968446B
CN107968446B CN201610912025.8A CN201610912025A CN107968446B CN 107968446 B CN107968446 B CN 107968446B CN 201610912025 A CN201610912025 A CN 201610912025A CN 107968446 B CN107968446 B CN 107968446B
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Prior art keywords
battery pack
switch
port
charging module
voltage
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CN107968446A (en
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王文成
周岿
刘伟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The embodiment of the invention provides a distributed battery pack power supply system and a charge and discharge control method. The first battery pack and the second battery pack of the distributed battery pack power supply system can respectively supply power to a power system, an air conditioning system and other high-voltage systems so as to improve the flexibility and the safety of the power supply system. Wherein, another battery package power supply is not influenced to a battery package trouble to effectively promote power supply system's reliability.

Description

Distributed battery pack power supply system and charge-discharge control method
Technical Field
The embodiment of the invention relates to a power electronic technology, in particular to a distributed battery pack power supply system and a charging and discharging control method.
Background
With the continuous development of automobile technology, new energy automobiles such as electric automobiles and hybrid electric automobiles are widely applied.
Fig. 1 is a schematic diagram of a local structure of a power supply system in an automobile, where m cells are connected in parallel to form a module, the module voltage is the same as the voltage of a single cell, the module capacity is m times of the capacity of the single cell, a plurality of modules are connected in series to form a module, and n modules are connected in series to form a battery pack of the power supply system, as shown in fig. 1. The battery pack supplies power to a high-voltage load through a relay. The total voltage of the battery pack depends on the total number of the series-connected modules, and the total ampere-hour number depends on the number of the battery cells connected in parallel in the modules.
However, the reliability of the typical series battery pack power supply system of fig. 1 is relatively low, and specifically, if a short-circuit fault occurs in one or more internal battery cells, the whole module may fail, and when any one module or module fails, the power supply may be interrupted, or even dangerous.
Disclosure of Invention
The embodiment of the invention provides a distributed battery pack power supply system and a charge and discharge control method, so as to effectively improve the reliability of the power supply system.
In a first aspect, an embodiment of the present invention provides a distributed battery pack power supply system, including:
the charging device comprises a charging module, a first battery pack, a first switch unit, a second battery pack, a second switch unit and a control unit;
the output end of the charging module is respectively connected with the first switch unit and the second switch unit, the input end of the charging module is respectively connected with the first switch unit and the second switch unit, the first switch unit is connected with the first battery pack, and the second switch unit is connected with the second battery pack;
the control unit is respectively connected with the charging module, the first battery pack, the first switch unit, the second battery pack and the second switch unit and is used for controlling the charging module, the first switch unit and the second switch unit according to the states of the first battery pack and the second battery pack;
the first battery pack comprises a plurality of electric cores which are connected in series, and the second battery pack comprises a plurality of electric cores which are connected in series.
The charging module 11 may be a vehicle-mounted charger, and an input end of the charging module 11 may be connected to an ac charging interface for accessing an external power supply.
In this implementation manner, in the above connection manner of the distributed battery pack power supply system, the control unit may control the first switch unit and the second switch unit, so that the output end of the charging module is connected or disconnected with the first battery pack, and the output end of the charging module is connected or disconnected with the second battery pack, that is, the first battery pack and the second battery pack may respectively supply power to high-voltage systems such as a power system and an air conditioning system, so as to increase the flexibility and the safety of the power supply system. Wherein, another battery package power supply is not influenced to a battery package trouble to effectively promote power supply system's reliability.
The above connection mode of the distributed battery pack power supply system of this implementation mode can also implement that the first battery pack charges the second battery pack, or the second battery pack charges the first battery pack.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a possible implementation manner of the first aspect, the first switch unit includes a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port; the first switching unit further comprises a first switch, a second switch, a third switch and a fourth switch;
one end of the first switch is connected with the first port, and the other end of the first switch is connected with the third port; one end of the second switch is connected with the second port, and the other end of the second switch is connected with the fourth port; one end of the third switch is connected with the first port, and the other end of the third switch is connected with the fifth port; one end of the fourth switch is connected with the second port, and the other end of the fourth switch is connected with the sixth port; the first port is connected with the positive electrode of the first battery pack, the second port is connected with the negative electrode of the first battery pack, the third port and the fourth port are connected with the output end of the charging module, and the fifth port and the sixth port are connected with the input end of the charging module;
the second switch unit comprises a seventh port, an eighth port, a ninth port, a tenth port, an eleventh port and a twelfth port; the second switch unit further comprises a fifth switch, a sixth switch, a seventh switch and an eighth switch;
one end of the fifth switch is connected with the seventh port, and the other end of the fifth switch is connected with the ninth port; one end of the sixth switch is connected with the eighth port, and the other end of the second switch is connected with the tenth port; one end of the seventh switch is connected with the seventh port, and the other end of the seventh switch is connected with the eleventh port; one end of the eighth switch is connected with the eighth port, and the other end of the eighth switch is connected with the twelfth port; the seventh port is connected with the positive electrode of the second battery pack, the eighth port is connected with the negative electrode of the second battery pack, the ninth port and the tenth port are connected with the output end of the charging module, and the eleventh port and the twelfth port are connected with the input end of the charging module.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a possible implementation manner of the first aspect, the first battery pack further includes a ninth switch, the ninth switch is connected between the positive electrode of the first battery pack and the first port, the second battery pack further includes a tenth switch, and the tenth switch is connected between the positive electrode of the second battery and the seventh port.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a possible implementation manner of the first aspect, the charging module includes a voltage conversion module, and the voltage conversion module is configured to convert a direct current input by an input end of the charging module into a direct current with another voltage, and charge the first battery pack or the second battery pack.
In this implementation, the charging module of the distributed battery pack power supply system can be connected to a direct current.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a possible implementation manner of the first aspect, the charging module further includes a power factor correction unit, and the charging module is configured to convert ac power input by the ac power input terminal into dc power and charge the first battery pack and the second battery pack.
In this implementation, the charging module of the distributed battery pack power supply system can be connected to an alternating current.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a possible implementation manner of the first aspect, the system further includes a load, and the load is connected to the output end of the charging module.
In this implementation, the first battery pack may supply power to the load, or the second battery pack may supply power to the load, or the first battery pack and the second battery pack may supply power to the load at the same time.
In a second aspect, an embodiment of the present invention provides a method for performing charging control by using a distributed battery pack power supply system according to the first aspect or any one of the foregoing possible implementation manners of the first aspect, including:
respectively acquiring the voltage of the first battery pack and the voltage of the second battery pack, and determining a voltage difference;
judging whether the voltage difference is within a preset range, if so, forming a first charging loop consisting of a charging module and a first battery pack by controlling a first switch unit, and forming a second charging loop consisting of the charging module and a second battery pack by controlling a second switch unit, wherein alternating current input by an input end of the charging module charges the first battery pack through the first charging loop, and charges the second battery pack through the second charging loop;
wherein, the first battery pack and the second battery pack are connected in parallel.
With reference to the second aspect, in a possible implementation manner of the second aspect, the method further includes:
if the first battery pack is in a full charge state, the first charging loop is disconnected by controlling a first switch unit;
and if the second battery pack is in a full charge state, the second charging loop is disconnected by controlling a second switch unit.
With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a possible implementation of the second aspect, the method further includes:
if the voltage difference is not within the preset range, comparing the voltage of the first battery pack with the voltage of the second battery pack;
if the voltage of the first battery pack is larger than the voltage of the second battery pack, a second charging loop composed of a charging module and the second battery pack is formed by controlling the second switch unit, alternating current input by the input end of the charging module is charged to the second battery pack through the second charging loop, and the charged voltage of the second battery pack is obtained.
With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a possible implementation of the second aspect, the method further includes:
determining an updated voltage difference according to the voltage of the first battery pack and the charged voltage of the second battery pack;
and judging whether the updated voltage difference is within a preset range.
With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a possible implementation of the second aspect, the method further includes:
if the voltage of the first battery pack is not larger than the voltage of the second battery pack, a first charging loop composed of a charging module and the first battery pack is formed by controlling the first switch unit, alternating current input by the input end of the charging module charges the first battery pack through the first charging loop, and the charged voltage of the first battery pack is obtained.
With reference to the second aspect or any one of the foregoing possible implementations of the second aspect, in a possible implementation of the second aspect, the method further includes:
determining an updated voltage difference according to the charged voltage of the first battery pack and the voltage of the second battery pack;
and judging whether the updated voltage difference is within a preset range.
In a third aspect, an embodiment of the present invention provides a method for performing mutual charging between battery packs by using a distributed battery pack power supply system according to the first aspect or any one of the foregoing possible implementation manners of the first aspect, where the method includes:
respectively acquiring the voltage of the first battery pack and the voltage of the second battery pack, and determining a voltage difference;
and judging whether the voltage difference is within a first preset range, if not, comparing the voltage of the first battery pack with the voltage of the second battery pack, if the voltage of the first battery pack is greater than the voltage of the second battery pack, forming a first direct current charging loop consisting of the first battery pack, the charging module and the second battery pack by controlling the first switch unit and the second switch unit, and charging the second battery pack by the first battery pack through the first direct current charging loop.
With reference to the third aspect, in a possible implementation manner of the third aspect, the method further includes:
acquiring the charged voltage of the second battery pack, and determining an updated voltage difference according to the charged voltage of the second battery pack and the voltage of the first battery pack;
and judging whether the updated voltage difference is within a second preset range, and if so, disconnecting the direct current charging loop by controlling the first switch unit and the second switch unit.
With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in a possible implementation manner of the third aspect, the method further includes:
if the voltage of the first battery pack is not larger than the voltage of the second battery pack, a second direct current charging loop consisting of the second battery pack, a charging module and the first battery pack is formed by controlling the first switch unit and the second switch unit, and the second battery pack charges the first battery pack through the second direct current charging loop.
With reference to the third aspect or any one of the foregoing possible implementation manners of the third aspect, in a possible implementation manner of the third aspect, the method further includes:
acquiring the charged voltage of the first battery pack, and determining an updated voltage difference according to the charged voltage of the first battery pack and the voltage of the second battery pack;
and judging whether the updated voltage difference is within a second preset range, and if so, disconnecting the two direct current charging loops by controlling the first switch unit and the second switch unit.
In a fourth aspect, an embodiment of the present invention provides a method for controlling battery pack discharge by using a distributed battery pack power supply system according to the first aspect or any one of the foregoing possible implementation manners of the first aspect, where the method includes:
and judging whether to discharge with high power by using a first battery pack and discharge with low power by using a second battery pack, if so, forming a first discharge loop consisting of the first battery pack and a load by controlling a first switch unit, and forming a second discharge loop consisting of the second battery pack, a charging module and the load by controlling a second switch unit, wherein the first battery pack and the second battery pack simultaneously supply power to the load.
In a fifth aspect, an embodiment of the present invention provides a method for controlling battery pack discharge by using a distributed battery pack power supply system according to the first aspect or any one of the foregoing possible implementation manners of the first aspect, where the method includes:
and judging whether the second battery pack is used for high-power discharge or not, the first battery pack is used for low-power discharge, if so, forming a first discharge loop consisting of the second battery pack and the load by controlling the second switch unit, and simultaneously forming a second discharge loop consisting of the first battery pack, the charging module and the load by controlling the first switch unit, wherein the first battery pack and the second battery pack simultaneously supply power to the load.
According to the distributed battery pack power supply system and the charge and discharge control method, the first battery pack and the second battery pack of the distributed battery pack power supply system can respectively supply power to a power system, an air conditioning system and other high-voltage systems, so that the flexibility and the safety of the power supply system are improved. Wherein, another battery package power supply is not influenced to a battery package trouble to effectively promote power supply system's reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a partial configuration of a power supply system in an automobile;
fig. 2 is a schematic structural diagram of a distributed battery pack power supply system according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of the distributed battery pack power supply system according to the present invention;
fig. 4A is a schematic structural diagram of a third embodiment of a distributed battery pack power supply system according to the present invention;
fig. 4B is a schematic structural diagram of a fourth embodiment of the distributed battery pack power supply system according to the present invention;
fig. 5 is a schematic structural diagram of a charging module of the distributed battery pack power supply system according to the present invention;
fig. 6 is a schematic structural diagram of a fifth embodiment of a distributed battery pack power supply system according to the present invention;
fig. 7 is a schematic structural diagram of a sixth embodiment of a distributed battery pack power supply system according to the present invention;
fig. 8 is a flowchart of a first embodiment of a method for performing charging control by using the distributed battery pack power supply system according to the embodiment shown in fig. 3;
fig. 9 is a flowchart of a first embodiment of a method for charging battery packs with each other by using the distributed battery pack power supply system shown in fig. 3 according to the present invention;
fig. 10 is a flowchart of a first embodiment of a method for controlling battery pack discharge by using the distributed battery pack power supply system shown in fig. 3 according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment of the distributed battery pack power supply system according to the present invention, and as shown in fig. 2, the distributed battery pack power supply system according to this embodiment may include: a charging module 11, a first battery pack 12, a first switching unit 13, a second battery pack 14, a second switching unit 15, and a control unit 16.
The input end of the charging module 11 is connected, the output end of the charging module 11 is connected with the first switch unit 13 and the second switch unit 15, the input end of the charging module 12 is connected with the first switch unit 13 and the second switch unit 15, the first switch unit 13 is connected with the first battery pack 12, and the second switch unit 15 is connected with the second battery pack 14. Specifically, as shown in fig. 2, the first switch unit 13 has four ports (131, 132, 133 and 134) on one side and two ports (135 and 136) on the other side, wherein the ports 131 and 132 are connected to the output terminal of the charging module 12, the ports 133 and 134 are connected to the input terminal of the charging module 11, the ports 135 and 136 are connected to the first battery pack 12, specifically, the port 135 is connected to the positive electrode of the first battery pack 12, and the port 136 is connected to the negative electrode of the first battery pack 12. Similarly, the second switch unit 15 has four ports (151, 152, 153 and 154) on one side and two ports (155 and 156) on the other side, wherein the ports 151 and 152 are connected to the output terminal of the charging module 11, the ports 153 and 154 are connected to the input terminal of the charging module 11, the ports 155 and 156 are connected to the second battery pack 14, specifically, the port 155 is connected to the positive electrode of the first battery pack 14, and the port 136 is connected to the negative electrode of the first battery pack 14.
As shown in fig. 2, the control unit 16 is connected to the charging module 11, the first battery pack 12, the first switch unit 13, the second battery pack 14, and the second switch unit 15, respectively, and the control unit 16 is configured to control the charging module 11, the first switch unit 13, and the second switch unit 14 according to states of the first battery pack 12 and the second battery pack 14.
The control unit 16 may be specifically configured to control the first switch unit 13 and the second switch unit 15, so that the output end of the charging module 11 is connected to or disconnected from the first battery pack 12, the output end of the charging module 11 is connected to or disconnected from the second battery pack 14, or the output end of the charging module 11 is connected to the first battery pack 12, the input end of the charging module 11 is connected to the second battery pack 14, or the input end of the charging module 11 is connected to the first battery pack 12, and the output end of the charging module 11 is connected to the second battery pack 14. The control unit 16 specifically controls parameters such as the charging current and the maximum charging voltage of the charging module 11. It should be noted that, as shown in fig. 2, two-way arrows are arranged between the control unit 16 and the first battery pack 12, the second battery pack 14, the first switch unit 13, the second switch unit 15, and the charging module 11, and specifically, the control unit 16 may obtain a current state of any one of the above units, or may actively control any one of the above units. The control unit 16 and the charging module 11 may perform bidirectional communication, and the communication manner may be implemented specifically, which is not limited herein.
The first battery pack 12 includes a plurality of battery cells 121 connected in series, and the second battery pack 14 includes a plurality of battery cells 141 connected in series.
The charging module 11 may specifically be a vehicle-mounted charger, and in an implementation manner, an input end of the charging module 11 may be connected to an ac charging interface for accessing an external power supply, and the external power supply is used to charge the first battery pack and/or the second battery pack. "A and/or B" specifically means A, B, or A and B. In another implementation manner, the input end of the charging module 11 is connected to a second battery pack, and the first battery pack is charged through the second battery pack. In another implementation manner, the input terminal of the charging module 11 is connected to the first battery pack, and the second battery pack is charged by the first battery pack. In another implementation manner, the input terminal of the charging module 11 is connected to a second battery pack, and power is supplied to the load through the second battery pack and the first battery pack. In another implementation manner, the input end of the charging module 11 is connected to the first battery pack, and the first battery pack and the second battery pack supply power to the load.
The first battery pack and the second battery pack in the distributed battery pack power supply system of the embodiment can respectively supply power to high-voltage systems such as a power system and an air conditioning system, so that the flexibility and the safety of the power supply system are improved. Wherein, another battery package power supply is not influenced to a battery package trouble to effectively promote power supply system's reliability.
The power supply system shown in fig. 2 will be described in detail below using several specific embodiments.
Fig. 3 is a schematic structural diagram of a second embodiment of the distributed battery pack power supply system according to the present invention, and as shown in fig. 3, the apparatus of this embodiment is based on the apparatus structure shown in fig. 2, and further, the first switch unit 13 may specifically include: a first switch Sa1, a second switch Sa2, a third switch Sa3, and a fourth switch Sa 4. The second switching unit 15 may specifically include a fifth switch Sb1, a sixth switch Sb2, a seventh switch Sb3, and an eighth switch Sb 4.
Specifically, one end of the first switch Sa1 is connected to the first port 135, and the other end of the first switch Sa1 is connected to the third port 131; one end of the second switch Sa2 is connected to the second port 136, and the other end of the second switch Sa2 is connected to the fourth port 132; one end of the third switch Sa3 is connected to the first port 135, and the other end of the third switch Sa2 is connected to the fifth port 133; one end of the fourth switch Sa4 is connected to the second port 136, the other end of the fourth switch Sa4 is connected to the sixth port 134, the third port 131 and the fourth port 132 are connected to the output terminal of the charging module 11, and the fifth port 133 and the sixth port 134 are connected to the input terminal of the charging module 11.
One end of a fifth switch Sb1 is connected to the seventh port 155, and the other end of the fifth switch Sb1 is connected to the ninth port 151; one end of the sixth switch Sb2 is connected to the eighth port 156, and the other end of the second switch Sb2 is connected to the tenth port 152; one end of a seventh switch Sb3 is connected to the seventh port 155, and the other end of the seventh switch Sb3 is connected to the eleventh port 153; one end of an eighth switch Sb4 is connected to the eighth port 156, and the other end of the eighth switch Sb4 is connected to the twelfth port 154; the ninth and tenth ports 151 and 152 are connected to an output terminal of the charging module 11, and the eleventh and twelfth ports 153 and 154 are connected to an input terminal of the charging module 11.
The first switch Sa1, the second switch Sa2, the fifth switch Sb1, and the sixth switch Sb2 may be specifically a high-voltage relay, a high-voltage contactor, a thyristor, or the like, and may also be other alternative electronic components specifically having a function of turning on or off a circuit, which is not illustrated here. The third switch Sa3, the fourth switch Sa4, the seventh switch Sb3, and the eighth switch Sb4 are mainly used to balance the energy of the first battery pack 12 and the second battery pack 14, and the power is relatively low, so that a high-voltage relay, a high-voltage contactor, a thyristor, and the like may be specifically used, or a semiconductor device (including but not limited to a semiconductor field effect transistor MOSFET) may also be used.
The first battery pack and the second battery pack in the distributed battery pack power supply system of the embodiment can respectively supply power to high-voltage systems such as a power system and an air conditioning system, so that the flexibility and the safety of the power supply system are improved. Wherein, another battery package power supply is not influenced to a battery package trouble to effectively promote power supply system's reliability.
Fig. 4A is a schematic structural diagram of a third embodiment of the distributed battery pack power supply system of the present invention, and fig. 4B is a schematic structural diagram of a fourth embodiment of the distributed battery pack power supply system of the present invention, as shown in fig. 4A and 4B, based on the structures shown in fig. 2 and 3, a load may be specifically set as shown in fig. 4A, or may be set as shown in fig. 4B. Specifically, as shown in fig. 4A, each battery pack (first battery pack and second battery pack) individually supplies power to a load, the positive electrode of each load is connected to the positive electrode of its corresponding battery pack, and the negative electrode of each load is connected to the negative electrode of its corresponding battery pack. As shown in fig. 4A, one end of the load 1 is connected to the first port 135, the other end of the load 1 is connected to the second port 136, one end of the load 2 is connected to the seventh port 155, and the other end of the load 2 is connected to the eighth port 156. Namely, the first battery pack 12 and the second battery pack 14 supply power to the respective connected loads.
Alternatively, as shown in fig. 4B, a load is connected between the fifth port 133 and the sixth port 134, and since the eleventh port 153 is connected to the fifth port 133 and the twelfth port 154 is connected to the sixth port 134, the load is also connected between the eleventh port 153 and the twelfth port 154. The first battery pack 12 and the second battery pack 14 collectively supply power to the load.
Optionally, the first battery pack may further include a ninth switch Sa5, the ninth switch Sa5 being connected between the positive electrode of the first battery pack 12 and the first port 135, and the second battery pack 14 may further include a tenth switch Sb5, the tenth switch Sb5 being connected between the positive electrode of the second battery 14 and the seventh port 155.
Fig. 5 is a schematic structural diagram of a charging module of the distributed battery pack power supply system according to the present invention, and as shown in fig. 5, on the basis of the structure of the foregoing embodiment, the charging module 11 may specifically include a voltage conversion module 111 and a power factor correction unit 112. The voltage conversion module 111 is configured to convert an input voltage to obtain a suitable voltage for power supply, and the power factor correction unit 112 is configured to convert an ac input from the ac input terminal into a dc to charge the first battery pack 12 and the second battery pack 14, or supply power to a load.
The distributed battery pack power supply system of the embodiment may charge the first battery pack 12 and the second battery pack 14 using ac power as an input power source, and may charge the first battery pack 12 and the second battery pack 14 using dc power as an input power source, or supply power to a load.
Fig. 6 is a schematic structural diagram of a fifth embodiment of the distributed battery pack power supply system according to the present invention, and based on the above embodiment, as another implementation manner, as shown in fig. 6, the first battery pack 12 may be combined with the first switch unit 13 as a new first battery pack, and the second battery pack 14 may be combined with the second switch unit 15 as a new second battery pack, which as an expression form may produce the same technical effects as the distributed battery pack power supply system according to the above embodiment.
Fig. 7 is a schematic structural diagram of a sixth embodiment of the distributed battery pack power supply system according to the present invention, and as another implementation manner, as shown in fig. 7, different from the centralized control of the distributed battery pack power supply system according to the foregoing embodiment, the control unit of the distributed battery pack power supply system according to the foregoing embodiment may be distributed, as shown in fig. 7, each battery pack is provided with a corresponding control unit, each control unit may exchange information, the control unit a may obtain the state of the first battery pack 12, the control unit b may obtain the state of the second battery pack 14, and the control unit a or the control unit b performs information aggregation, and controls the first switch unit, the second switch unit, and the charging module according to the state of the first battery pack 12 and the state of the second battery pack 14. Wherein, the control unit a and the control unit b can perform bidirectional communication with the charging module 11.
The distributed battery pack power supply system can be used for controlling charging in a vehicle stop state so as to realize charging to each battery pack respectively, can meet the charging requirement of each battery pack and discharge control in a vehicle running state, and can realize continuous and effective power supply to a load in the vehicle running process. The following describes in detail the method for controlling charging and discharging by using the distributed battery pack power supply system of the present embodiment in three embodiments.
Fig. 8 is a flowchart of a first embodiment of a method for performing charging control by using the distributed battery pack power supply system shown in fig. 3, where as shown in fig. 8, the method in this embodiment may include:
in the initialization process of the method of this embodiment, all switches of the distributed battery pack power supply system are set to be in an off state. When the alternating current input end of the distributed battery pack power supply system is connected with an input power supply, the following steps are executed.
Step 101, respectively obtaining the voltage of the first battery pack and the voltage of the second battery pack, and determining a voltage difference.
And 102, judging whether the voltage difference is within a preset range, if so, executing a step 103, and if not, executing a step 106.
103, forming a first charging loop consisting of a charging module and a first battery pack by controlling a first switch unit, and forming a second charging loop consisting of the charging module and a second battery pack by controlling a second switch unit, wherein alternating current input by an input end of the charging module charges the first battery pack through the first charging loop, and charges the second battery pack through the second charging loop.
Wherein the first battery pack and the second battery pack are connected in parallel.
Specifically, the control unit 16 may control to close the first switch Sa1 and the second switch Sa2 of the first switching unit 13 to form a first charging loop composed of the charging module 11 and the first battery pack 12, and control to close the fifth switch Sb1 and the sixth switch Sb2 of the second switching unit 15 to form a second charging loop composed of the charging module 11 and the second battery pack 14, and the ac power input from the input terminal of the charging module 11 is charged to the first battery pack through the first charging loop and is charged to the second battery pack through the second charging loop.
And 104, if the first battery pack is in a full charge state, disconnecting the first charging loop by controlling a first switch unit.
Specifically, the control unit 16 may control to open the first switch Sa1 and the second switch Sa2 of the first switch unit 13, thereby opening the first charging loop.
The fully charged state specifically means that the battery capacity reaches the maximum battery capacity.
And 105, if the second battery pack is in a full charge state, disconnecting the second charging loop by controlling the second switch unit.
Specifically, the control unit 16 may control to open the fifth switch Sb1 and the sixth switch Sb2 of the second switching unit 15, thereby opening the second charging circuit.
Step 106, judging whether the voltage of the first battery pack is larger than the voltage of the second battery pack, if so, executing step 107, and if not, executing step 108.
And 107, forming a second charging loop consisting of a charging module and a second battery pack by controlling the second switch unit, and charging the second battery pack by using alternating current input by the input end of the charging module through the second charging loop to obtain the charged voltage of the second battery pack.
Specifically, the control unit 16 may control to close the fifth switch Sb1 and the sixth switch Sb2 of the second switching unit 15 to form the second charging loop.
And determining a voltage difference according to the charged voltage of the second battery pack and the voltage of the first battery pack, and returning to the step 102.
And 108, forming a first charging loop consisting of a charging module and a first battery pack by controlling the first switch unit, and charging the first battery pack by alternating current input by the input end of the charging module through the first charging loop to obtain the charged voltage of the first battery pack.
Specifically, the control unit 16 may control to close the first switch Sa1 and the second switch Sa2 of the first switch unit 13 to form a first charging loop.
And determining a voltage difference according to the charged voltage of the first battery pack and the voltage of the second battery pack, and returning to the step 102.
According to the charging control method, the first switch unit and the second switch unit can be dynamically controlled according to the voltage states of the first battery pack and the second battery pack, so that when the voltage difference between the first battery pack and the second battery pack is large, the battery pack with the smaller voltage is independently charged, when the voltage difference between the first battery pack and the second battery pack is small, the battery pack and the battery pack can be simultaneously charged, any one battery pack is fully charged, the charging of the battery pack is stopped, the charging of the other battery pack is not influenced when the battery pack stops charging, and the charging requirement of each battery pack can be met.
Fig. 9 is a flowchart of a first embodiment of a method for performing mutual charging between battery packs by using the distributed battery pack power supply system shown in the embodiment of fig. 3, as shown in fig. 9, the method of this embodiment may include:
the method of the embodiment is particularly applied to the normal running process of the vehicle.
Step 201, respectively obtaining the voltage of the first battery pack and the voltage of the second battery pack, and determining the voltage difference.
Step 202, determining whether the voltage difference is within a first preset range, if not, performing step 203, and if so, performing step 201.
Step 203, determining whether the voltage of the first battery pack is greater than the voltage of the second battery pack, if so, executing step 204, otherwise, executing step 208.
And 204, forming a first direct current charging loop consisting of the first battery pack, the charging module and the second battery pack by controlling the first switch unit and the second switch unit, and charging the second battery pack by the first battery pack through the first direct current charging loop.
Specifically, the control unit 16 may control to close the third switch Sa3 and the fourth switch Sa4 of the first switching unit 13, and control to close the fifth switch Sb1 and the sixth switch Sb2 of the second switching unit 15, thereby forming the first dc charging circuit.
Step 205, obtaining the charged voltage of the second battery pack, and determining an updated voltage difference according to the charged voltage of the second battery pack and the voltage of the first battery pack.
Step 206, determining whether the updated voltage difference is within a second preset range, if so, executing step 207, and if not, executing step 204.
And step 207, disconnecting the first direct current charging loop by controlling the first switch unit and the second switch unit.
Specifically, the control unit 16 may control to open the third switch Sa3, the fourth switch Sa4, the fifth switch Sb1 and the sixth switch Sb2, thereby disconnecting the first dc charging circuit.
And 208, forming a second direct current charging loop consisting of the second battery pack, the charging module and the first battery pack by controlling the first switch unit and the second switch unit, and charging the first battery pack by the second battery pack through the second direct current charging loop.
Specifically, the control unit 16 may control to close the first switch Sa1 and the second switch Sa2 of the first switch unit 13, and control to close the seventh switch Sb3 and the eighth switch Sb4 of the second switch unit 15, forming the second dc charging circuit.
Step 209, obtaining the charged voltage of the first battery pack, and determining an updated voltage difference according to the charged voltage of the first battery pack and the voltage of the second battery pack.
Step 210, determining whether the updated voltage difference is within a second preset range, if so, performing step 211, and if not, performing step 208.
And step 211, disconnecting the second dc charging loop by controlling the first switch unit and the second switch unit.
Specifically, the control unit 16 may control to open the first switch Sa1 and the second switch Sa2 of the first switch unit 13, and control to open the seventh switch Sb3 and the eighth switch Sb4 of the second switch unit 15, thereby disconnecting the second dc charging circuit.
According to the discharge control method, the first switch unit and the second switch unit can be dynamically controlled according to the voltage states of the first battery pack and the second battery pack, and when the voltage of any one battery pack is insufficient, the other battery pack can supply power to the battery pack, so that the reliability of a power supply system is effectively improved.
Fig. 10 is a flowchart of a first embodiment of a method for controlling battery pack discharge by using the distributed battery pack power supply system shown in the embodiment of fig. 3, which is different from the embodiment shown in fig. 9, in this embodiment, a first battery pack and a second battery pack respectively supply power to a load, and if a load of one of the battery packs requires a large power, two battery packs simultaneously supply power to the load with the large power, as shown in fig. 10, the method of this embodiment may include:
the method of the embodiment is particularly applied to the normal running process of the vehicle. The load connection mode of the present embodiment is specifically shown in fig. 4B.
And 301, respectively acquiring the discharge power of the first battery pack and the discharge power of the second battery pack.
Step 302, determine whether to use the first battery pack for high power discharge and the second battery pack for low power discharge. If yes, go to step 303, otherwise go to step 304.
Step 303, forming a first discharging loop composed of the first battery pack and a load by controlling a first switch unit, and forming a second discharging loop composed of the second battery pack, a charging module and the load by controlling a second switch unit, wherein the first battery pack and the second battery pack supply power to the load at the same time.
Specifically, the control unit 16 may control to close the first switch Sa1 and the second switch Sa2 of the first switching unit 13 to form a first discharge circuit composed of the first battery pack 12 and the load, and the control unit 16 controls to close the seventh switch Sb3 and the eighth switch Sb4 of the second switching unit 15 to form the second discharge circuit.
And 304, forming a third discharging loop consisting of a second battery pack and a load by controlling a second switch unit, and forming a fourth discharging loop consisting of a first battery pack, a charging module and the load by controlling a first switch unit, wherein the first battery pack and the second battery pack supply power to the load at the same time.
Specifically, the control unit 16 may control to close the fifth switch Sb1 and the sixth switch Sb2 of the second switching unit 15 to form the third discharge circuit, and the control unit 16 may control to close the third switch Sa3 and the fourth switch Sa4 of the first switching unit 13 to form the fourth discharge circuit.
In the discharge control method of the embodiment, the first battery pack and the second battery pack can simultaneously supply power to respective loads, and when any one battery pack discharges with high power, the other battery pack can simultaneously supply power to the load of the battery pack discharging with high power through the charging module, so as to meet the power supply requirements of different loads. Thereby effectively improving the reliability of the power supply system.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A distributed battery pack power supply system, comprising:
the charging device comprises a charging module, a first battery pack, a first switch unit, a second battery pack, a second switch unit and a control unit;
the output end of the charging module is respectively connected with the first switch unit and the second switch unit, the input end of the charging module is respectively connected with the first switch unit and the second switch unit, the first switch unit is connected with the first battery pack, and the second switch unit is connected with the second battery pack;
the control unit is respectively connected with the charging module, the first battery pack, the first switch unit, the second battery pack and the second switch unit, and is used for controlling the charging module, the first switch unit and the second switch unit according to the states of the first battery pack and the second battery pack;
the first battery pack comprises a plurality of battery cells which are connected in series, and the second battery pack comprises a plurality of battery cells which are connected in series; respectively acquiring the discharge power of the first battery pack and the discharge power of the second battery pack; and judging whether to discharge with high power by using a first battery pack and discharge with low power by using a second battery pack, if so, forming a first discharge loop consisting of the first battery pack and a load by controlling a first switch unit, and forming a second discharge loop consisting of the second battery pack, a charging module and the load by controlling a second switch unit, wherein the first battery pack and the second battery pack simultaneously supply power to the load.
2. The system of claim 1, wherein the control unit is configured to control the first switch unit and the second switch unit to switch on or off the output terminal of the charging module with the first battery pack and switch on or off the output terminal of the charging module with the second battery pack, or switch on the output terminal of the charging module with the first battery pack and switch on the input terminal of the charging module with the second battery pack, or switch on the input terminal of the charging module with the first battery pack and switch on the output terminal of the charging module with the second battery pack.
3. The system of claim 1 or 2, wherein the first switching unit comprises a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port; the first switching unit further comprises a first switch, a second switch, a third switch and a fourth switch;
one end of the first switch is connected with the first port, and the other end of the first switch is connected with the third port; one end of the second switch is connected with the second port, and the other end of the second switch is connected with the fourth port; one end of the third switch is connected with the first port, and the other end of the third switch is connected with the fifth port; one end of the fourth switch is connected with the second port, and the other end of the fourth switch is connected with the sixth port; the first port is connected with the positive electrode of the first battery pack, the second port is connected with the negative electrode of the first battery pack, the third port and the fourth port are connected with the output end of the charging module, and the fifth port and the sixth port are connected with the input end of the charging module;
the second switch unit comprises a seventh port, an eighth port, a ninth port, a tenth port, an eleventh port and a twelfth port; the second switch unit further comprises a fifth switch, a sixth switch, a seventh switch and an eighth switch;
one end of the fifth switch is connected with the seventh port, and the other end of the fifth switch is connected with the ninth port; one end of the sixth switch is connected with the eighth port, and the other end of the sixth switch is connected with the tenth port; one end of the seventh switch is connected with the seventh port, and the other end of the seventh switch is connected with the eleventh port; one end of the eighth switch is connected with the eighth port, and the other end of the eighth switch is connected with the twelfth port; the seventh port is connected with the positive electrode of the second battery pack, the eighth port is connected with the negative electrode of the second battery pack, the ninth port and the tenth port are connected with the output end of the charging module, and the eleventh port and the twelfth port are connected with the input end of the charging module.
4. The system according to claim 1 or 2, wherein the charging module comprises a voltage conversion module, and the voltage conversion module is configured to convert the dc power input from the input terminal of the charging module into dc power of another voltage, and charge the first battery pack or the second battery pack.
5. The system of claim 4, wherein the charging module further comprises a power factor correction unit, and the charging module is configured to convert the ac power input from the input terminal of the charging module into dc power to charge the first battery pack and the second battery pack.
6. The system of claim 1 or 2, further comprising a load connected to an output of the charging module.
7. A method for mutual charging between battery packs by using the distributed battery pack power supply system according to any one of claims 1 to 6, comprising:
respectively acquiring the voltage of the first battery pack and the voltage of the second battery pack, and determining a voltage difference;
and judging whether the voltage difference is within a first preset range, if not, comparing the voltage of the first battery pack with the voltage of the second battery pack, if the voltage of the first battery pack is greater than the voltage of the second battery pack, forming a first direct current charging loop consisting of the first battery pack, the charging module and the second battery pack by controlling the first switch unit and the second switch unit, and charging the second battery pack by the first battery pack through the first direct current charging loop.
8. The method of claim 7, further comprising:
acquiring the charged voltage of the second battery pack, and determining an updated voltage difference according to the charged voltage of the second battery pack and the voltage of the first battery pack;
and judging whether the updated voltage difference is within a second preset range, and if so, disconnecting the first direct current charging loop by controlling the first switch unit and the second switch unit.
9. The method of claim 8, further comprising:
if the voltage of the first battery pack is smaller than that of the second battery pack, a second direct-current charging loop formed by the second battery pack, the charging module and the first battery pack is formed by controlling the first switch unit and the second switch unit, and the second battery pack charges the first battery pack through the second direct-current charging loop.
10. The method of claim 9, further comprising:
acquiring the charged voltage of the first battery pack, and determining an updated voltage difference according to the charged voltage of the first battery pack and the voltage of the second battery pack;
and judging whether the updated voltage difference is within a second preset range, and if so, disconnecting the second direct current charging loop by controlling the first switch unit and the second switch unit.
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