CN111452671A - Battery circuit, and control method, device and equipment of battery circuit - Google Patents
Battery circuit, and control method, device and equipment of battery circuit Download PDFInfo
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- CN111452671A CN111452671A CN202010313505.9A CN202010313505A CN111452671A CN 111452671 A CN111452671 A CN 111452671A CN 202010313505 A CN202010313505 A CN 202010313505A CN 111452671 A CN111452671 A CN 111452671A
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- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/19—Switching between serial connection and parallel connection of battery modules
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- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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- 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Sustainable Development (AREA)
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- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery circuit, and a control method, a control device and a control equipment of the battery circuit. Wherein, this battery circuit includes: a plurality of battery packs; the switch that charges for control a plurality of groups battery switches on with the interface that charges, wherein, the interface that charges is used for charging for a plurality of groups batteries, and the interface that charges includes: a high-voltage charging interface; the series switch is used for controlling the plurality of battery packs to be connected in series under the condition that the plurality of battery packs are conducted with the high-voltage charging interface; the discharging switch is used for controlling the conduction of the plurality of battery packs and the discharging interface, wherein the discharging interface is used for discharging the plurality of battery packs; and the parallel switch is used for controlling the parallel connection of the plurality of battery packs under the condition that the plurality of battery packs are conducted with the discharge interface. The invention solves the technical problem of low charging efficiency of the battery pack caused by the fact that the charging voltage of the battery pack cannot be adjusted.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a battery circuit, and a control method, a control device and control equipment of the battery circuit.
Background
The charging power is low, the charging time is long, the experience that many electric automobile drivers are not good in the process of using the electric automobile is very good, and particularly the drivers who do not install the charging pile at home. The low charging power not only causes inconvenience to the daily use of consumers, but also is a vicious circle for the whole power battery industry. Conversely, higher charge power may have a positive impact on industry development.
In order to improve the charging power, a power target of a super quick-charging station is established, wherein the highest target is 350kW, a mode of improving current carrying through a thickened cable meets a bottleneck, and a voltage-improving mode is usually adopted for the target, for example, 1000V @350A and 700V @500A are usually realized by adopting the following modes:
1. raise the bus voltage platform of the whole vehicle.
2. The charging station charges a 1000V or 700V battery pack and outputs the battery pack to the whole vehicle through DCDC voltage reduction.
3. The charging station charges the 350V battery pack after the voltage is reduced through the DCDC, and the battery pack is output to the whole vehicle.
However, raise whole car bus voltage platform, nevertheless can cause car end electrical system to boost, with high costs, cycle length, still can have following problem:
1. the cost is higher by adopting high-power DCDC;
2. raising the voltage of the battery pack can cause all electrical systems in the battery pack to be boosted, which is costly.
3. Raise whole car bus voltage platform, can lead to whole car end electrical system to step up, it is with high costs, the cycle length.
In view of the above-mentioned problem of low charging efficiency of the battery pack due to the inability to adjust the charging voltage of the battery pack, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a battery circuit, a control method, a control device and control equipment of the battery circuit, and aims to at least solve the technical problem of low charging efficiency of a battery pack caused by incapability of adjusting the charging voltage of the battery pack.
According to an aspect of an embodiment of the present invention, there is provided a battery circuit including: a plurality of battery packs; the switch that charges for control a plurality of groups of batteries switch on with the interface that charges, wherein, the interface that charges is used for a plurality of groups of batteries charge, the interface that charges includes: a high-voltage charging interface; the series switch is used for controlling the plurality of battery packs to be connected in series under the condition that the plurality of battery packs are conducted with the high-voltage charging interface; the discharging switch is used for controlling the plurality of battery packs to be conducted with a discharging interface, wherein the discharging interface is used for discharging the plurality of battery packs; and the parallel switch is used for controlling the plurality of battery packs to be connected in parallel under the condition that the plurality of battery packs are conducted with the discharge interface.
Optionally, the plurality of battery packs includes at least: a first battery pack and a second battery pack; the parallel switch includes: a first parallel switch and a second parallel switch; the first parallel switch is connected with the first end of the first battery pack in series to obtain a first battery pack circuit; the second parallel switch is connected with the second end of the second battery pack in series to obtain a second battery pack circuit; wherein the first battery pack circuit is connected in parallel with the second battery pack circuit; the first end of the series switch is connected between the first parallel switch and the first battery pack, and the second end of the series switch is connected between the second battery pack and the second parallel switch.
Optionally, the charging interface further includes: a low-voltage charging interface; the parallel switch is further used for controlling the plurality of battery packs to be connected in parallel under the condition that the plurality of battery packs are conducted with the low-voltage charging interface.
Optionally, when the charging switch is used for controlling the plurality of battery packs to be connected with the high-voltage charging interface, the charging switch is linked with the series switch to control the charging switch and the series switch to be connected or disconnected together; or under the condition that the charging switch is used for controlling the plurality of battery packs to be conducted with the low-voltage charging interface, the charging switch is linked with the parallel switch, and the charging switch and the parallel switch are controlled to be jointly switched on or switched off; or under the condition that the discharge switch is used for controlling the plurality of battery packs to be conducted with the discharge interface, the discharge switch is linked with the parallel switch, and the discharge switch and the parallel switch are controlled to be jointly closed or opened.
Optionally, the first ends of the plurality of battery packs are connected to the positive electrode of the charging interface through the charging switch; the second ends of the plurality of battery packs are connected with the negative electrode of the charging interface; the first ends of the plurality of battery packs are connected with the positive electrode of the discharging interface through the discharging switch; and the second ends of the plurality of battery packs are connected with the negative electrode of the discharge interface.
According to another aspect of the embodiments of the present invention, there is also provided a battery circuit including: the switch that charges for control at least one battery package switches on with the interface that charges, wherein, the interface that charges is used for the battery package charges, the interface that charges includes: a high-voltage charging interface; the discharging switch is used for controlling the conduction of the at least one battery pack and a discharging interface, wherein the discharging interface is used for discharging the battery pack; wherein, in the case that the battery pack is plural, the plural battery packs are connected in series, and each battery pack includes: the battery pack charging system comprises a plurality of battery packs, a series switch and a parallel switch, wherein the plurality of battery packs are controlled to be connected in series through the series switch under the condition that the plurality of battery packs are connected with a high-voltage charging interface, and the plurality of battery packs are controlled to be connected in parallel through the parallel switch under the condition that the plurality of battery packs are connected with a discharging interface.
Optionally, the plurality of battery packs includes at least: a first battery pack and a second battery pack; the parallel switch includes: a first parallel switch and a second parallel switch; the first parallel switch is connected with the first end of the first battery pack in series to obtain a first battery pack circuit; the second parallel switch is connected with the second end of the second battery pack in series to obtain a second battery pack circuit; wherein the first battery pack circuit is connected in parallel with the second battery pack circuit; the first end of the series switch is connected between the first parallel switch and the first battery pack, and the second end of the series switch is connected between the second battery pack and the second parallel switch.
According to another aspect of the embodiments of the present invention, there is also provided a control method of a battery circuit, the battery circuit including: the battery circuit described above, the method comprising: detecting an operation mode of the plurality of battery packs, wherein the operation mode at least comprises: a high-voltage charging mode and a discharging mode; under the condition that the plurality of battery packs are in a high-voltage charging mode, controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected; and under the condition that the plurality of battery packs are in a discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be disconnected.
According to another aspect of the embodiments of the present invention, there is also provided a control apparatus of a battery circuit, the battery circuit including: the battery circuit described above, the apparatus comprising: a detection unit for detecting an operation mode of the plurality of battery packs, wherein the operation mode at least includes: a high-voltage charging mode and a discharging mode; the charging control unit is used for controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected under the condition that the plurality of battery packs are in a charging mode; and the discharge control unit is used for controlling the discharge switch and the parallel switch to be closed and controlling the charging switch and the series switch to be disconnected under the condition that the plurality of battery packs are in a discharge mode.
According to another aspect of the embodiments of the present invention, there is also provided a control apparatus of a battery circuit, the battery circuit including: the battery circuit described above, the apparatus further comprising: a controller for controlling an operation mode of the plurality of battery packs, wherein the operation mode includes: a high-voltage charging mode and a discharging mode; under the condition that the plurality of battery packs are in a high-voltage charging mode, controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected; and under the condition that the plurality of battery packs are in a discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be disconnected.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, under the condition of charging the plurality of battery packs, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed simultaneously, so that the plurality of battery packs are connected in series and then connected to the high-voltage charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a first schematic diagram of a battery circuit according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram of a battery circuit according to an embodiment of the present invention;
FIG. 3 is a third schematic diagram of a battery circuit according to an embodiment of the present invention;
FIG. 4 is a fourth schematic diagram of a battery circuit according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method of controlling a battery circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control apparatus for a battery circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a control device of a battery circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a battery circuit according to an embodiment of the present invention, as shown in fig. 1, the battery circuit includes: a plurality of battery packs V; switch K4 charges for control a plurality of group battery V switches on with interface 12 charges, and wherein, interface 12 charges is used for charging for a plurality of group battery V, and the interface that charges includes: a high-voltage charging interface; the series switch K2 is used for controlling the plurality of battery packs V to be connected in series under the condition that the plurality of battery packs V are conducted with the high-voltage charging interface; the discharge switch K3 is configured to control conduction between the plurality of battery packs V and the discharge interface 14, where the discharge interface 14 is configured to discharge the plurality of battery packs V; and a parallel switch K1 for controlling the parallel connection of the plurality of battery packs V when the plurality of battery packs V are electrically connected to the discharge interface 14.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, under the condition of charging the plurality of battery packs, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed simultaneously, so that the plurality of battery packs are connected in series and then connected to the high-voltage charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
As an alternative embodiment, the battery pack includes: at least one battery, wherein, in the case that the battery is a plurality of, the plurality of batteries are connected in series.
It should be noted that the series switch, the parallel switch, the charge switch, and the discharge switch may be single-pole multi-control switches, double-pole double-control switches, or other replaceable switches.
As an optional embodiment, the charging interface further includes: a low-voltage charging interface; and the parallel switch is also used for controlling the parallel connection of the plurality of battery packs under the condition that the plurality of battery packs are conducted with the low-voltage charging interface.
The charging interface includes: the system comprises a high-voltage charging interface and a low-voltage charging interface, wherein the plurality of battery packs are determined to be in a high-voltage charging mode under the condition that the plurality of battery packs are conducted with the high-voltage charging interface; determining that the plurality of battery packs are in a low-voltage charging mode under the condition that the plurality of battery packs are conducted with the low-voltage charging interface; and under the condition that the plurality of battery packs are conducted with the discharging interface, determining that the plurality of battery packs are in a discharging mode.
Optionally, the charging voltage provided by the high-voltage charging interface is higher than the charging voltage provided by the low-voltage charging interface.
In the embodiment of the invention, under the condition of charging a plurality of battery packs, the discharging switch and the series switch are disconnected, and the charging switch and the parallel switch are simultaneously closed to connect the plurality of battery packs into the low-voltage charging interface after the plurality of battery packs are connected in parallel, so that the battery packs can be charged at low voltage under the condition of not changing the charging voltage of the battery packs.
It should be noted that the battery circuit may be a battery circuit of an electric vehicle, and in the process of charging the electric vehicle by using the charging pile, communication between the electric vehicle and the charging pile may be established, and then it is determined that the battery pack is in a low-voltage charging mode or a high-voltage charging mode based on a communication result, and then the on-off state or the off-off state of the series switch and the parallel switch in the battery circuit is further controlled according to the mode of the battery pack.
As an optional embodiment, when the charging switch is used for controlling the plurality of battery packs to be connected with the high-voltage charging interface, the charging switch is linked with the series switch, and the charging switch and the series switch are controlled to be closed or opened together; or under the condition that the charging switch is used for controlling the plurality of battery packs to be conducted with the low-voltage charging interface, the charging switch is linked with the parallel switch, and the charging switch and the parallel switch are controlled to be closed or opened together; or under the condition that the discharge switch is used for controlling the conduction of the plurality of battery packs and the discharge interface, the discharge switch is linked with the parallel switch to control the common on/off of the discharge switch and the parallel switch.
According to the embodiment of the invention, the charging switch is linked with the series switch, and the charging switch and the series switch can be controlled to be switched on or switched off at the same time, so that the high-voltage charging mode is entered or exited; the charging switch is linked with the parallel switch, and can control the charging switch and the parallel switch to be switched on or switched off at the same time, so that the low-voltage charging mode is entered or exited; the discharge switch is linked with the parallel switch, and can control the on/off of the discharge switch and the parallel switch simultaneously, so as to enter or exit a discharge mode.
As an alternative embodiment, the first terminals of the plurality of battery packs are connected with the positive electrode of the charging interface through the charging switch; and the second ends of the battery packs are connected with the negative electrode of the charging interface.
As an alternative embodiment, the first terminals of the plurality of battery packs are connected with the positive electrode of the discharge interface through the discharge switch; and the second ends of the plurality of battery packs are connected with the negative electrode of the discharge interface.
In the above embodiment of the present invention, the charging switch is disposed at the positive electrode of the charging interface; the discharging switch is arranged at the anode of the charging interface, so that the safety of the battery circuit can be ensured.
Fig. 2 is a second schematic diagram of a battery circuit according to an embodiment of the present invention, and as shown in fig. 2, two battery packs are taken as an example for description, where the plurality of battery packs at least include: a first battery pack V1 and a second battery pack V2; the parallel switch K1 includes: a first parallel switch K1A and a second parallel switch K1B; the first parallel switch K1A is connected in series with a first end of the first battery pack V1 to obtain a first battery pack circuit; the second parallel switch K1B is connected in series with the second end of the second battery pack V2 to obtain a second battery pack circuit; the first battery pack circuit is connected with the second battery pack circuit in parallel; a first end of the series switch K2 is connected between the first parallel switch K1A and the first battery pack V1, and a second end of the series switch K2 is connected between the second battery pack V2 and the second parallel switch K1B.
Alternatively, the number of series switches may be determined according to the number of battery packs in the same battery circuit. For example, the number of series switches is equal to the number of battery packs — 1, and each series switch is connected in series between two battery packs in turn.
Alternatively, the number of parallel switches in the same battery circuit may also be determined according to the number of battery packs, for example, the number of parallel switches is (number of battery packs in battery pack-2) × 2+ 2.
Fig. 3 is a third schematic diagram of a battery circuit according to an embodiment of the present invention, and as shown in fig. 3, three battery packs are taken as an example for description, where the plurality of battery packs at least include: a first battery pack V1, a second battery pack V2, and a second battery pack V3; the parallel switch K1 includes: a first parallel switch K1A, a second parallel switch K1B, a third parallel switch K1C and a fourth parallel switch K1D; the series switch K2 includes: a first series switch K2A and a second series switch K2B; the first parallel switch K1A is connected in series with a first end of the first battery pack V1 to obtain a first battery pack circuit; the second parallel switch K1B is connected in series with the second end of the second battery pack V2, and the third parallel switch K1C is connected in series with the first end of the second battery pack V2, so that a second battery pack circuit is obtained; the fourth parallel switch K1D is connected in series with the second end of the third battery pack V3 to obtain a third battery pack circuit; the first battery pack circuit, the second battery pack circuit and the third battery pack circuit are connected in parallel; a first end of the first series switch K2A is connected between the first parallel switch K1A and the first battery pack V1, and a second end of the first series switch K2A is connected between the second battery pack V2 and the second parallel switch K1B; a first end of the second series switch K2B is connected between the second parallel switch K1B and the second battery pack V2, and a second end of the second series switch K2B is connected between the third battery pack V3 and the fourth parallel switch K1D.
Optionally, when the number of battery packs in the same battery circuit is more than three, each time one battery pack is added, one series switch and two parallel switches are correspondingly added, the connection mode of the battery packs is shown in fig. 3, and details are not repeated here.
Alternatively, the battery circuits shown in fig. 1-3 described above may be used in an electric vehicle.
Alternatively, in the case where the electric vehicle is in a running state, the battery pack operates in a discharging mode, and the parallel switch K1 and the discharging switch K3 are closed; the series switch K2 and the charge switch K4 are open.
Alternatively, in the case where the electric vehicle is in a low-voltage charging state (i.e., a low-voltage charging mode), the battery pack operates in the charging mode, and the parallel switch K1 and the discharge switch K3 are turned off; the series switch K2 and the charge switch K4 are closed.
Alternatively, in the case where the electric vehicle is in a rapid charging state (i.e., a high-voltage charging mode), the battery pack operates in the charging mode, and the parallel switch K1 and the discharge switch K3 are turned off; the series switch K2 and the charge switch K4 are closed.
Optionally, the charging interface may be connected to a charging station, a high-power dc charger, or a dc charger combination device, wherein the charging voltage supported by the charging interface may be 200-1210V.
Alternatively, the charging interface may be connected to a circuit in the electric vehicle, such as a driving circuit of the electric vehicle, and the discharging voltage output by the charging interface may be 100-700V.
In the above embodiment of the present invention, when the charging device performs high-voltage charging on the battery pack: the series switch K2 and the charging switch K4 are closed, and the parallel switch K1 and the discharging switch K3 are opened, so that the plurality of battery packs are connected in series; when the charging equipment performs low-voltage charging on the battery pack: the parallel switch K1 and the charging switch K4 are closed, and the series switch K2 and the discharging switch K3 are opened, so that the plurality of battery packs are connected in parallel; during discharging, the parallel switch K1 and the discharge switch K3 are closed; the series switch K2 and the charge switch K4 are turned off, and the plurality of battery packs are connected in parallel.
Optionally, the switch on each battery branch (i.e. the parallel switch K1) is closed in turn during discharging, and the other switch is switched when the first battery discharges to the lowest SOC and is not 0, so that the next battery starts to discharge, and so on.
Optionally, during the discharging process of the battery circuit, the multiple parallel switches in the battery circuit may be sequentially closed, so that the multiple battery packs in the battery pack are sequentially connected to the discharging circuit, for example, a certain battery pack is connected first, then another parallel switch is switched to enable the next battery pack to start discharging when the battery state of charge SOC (i.e., remaining charge) in the battery pack is lowest and not 0, and so on, and all the battery packs in the battery circuit are sequentially connected.
Optionally, the charging voltage of the charging interface is 200-1210V; the discharge voltage of the discharge interface is 100-700V.
As an alternative embodiment, the battery circuit comprises: a plurality of battery packs; the series switch is used for controlling the plurality of battery packs to be connected in series; the parallel switch is used for controlling the parallel connection of the plurality of battery packs; the discharging switch is used for controlling the plurality of battery packs to be conducted with the discharging interface, wherein the parallel switch is closed to enable the plurality of battery packs to be connected in parallel under the condition that the plurality of battery packs are conducted with the discharging interface; the switch that charges for control a plurality of groups battery switches on with the interface that charges, wherein, the interface that charges includes: the low-voltage charging interface and the high-voltage charging interface are used for connecting the plurality of battery packs in parallel by closing the parallel switch under the condition that the plurality of battery packs are conducted with the low-voltage discharging interface, and connecting the plurality of battery packs in series by closing the series switch under the condition that the plurality of battery packs are conducted with the high-voltage discharging interface.
Fig. 4 is a fourth schematic diagram of a battery circuit according to an embodiment of the present invention, as shown in fig. 4, the battery circuit includes: the charging switch K4 is used for controlling at least one battery pack 42 to be connected with the charging interface 12, wherein the charging interface 12 is used for charging a plurality of battery packs 42, and the charging interface 12 includes: a high-voltage charging interface; the discharge switch K3 is configured to control at least one battery pack 42 to be electrically connected to the discharge interface 14, where the discharge interface 14 is configured to discharge the battery pack 42; in a case where there are a plurality of battery packs 42, the plurality of battery packs 42 are connected in series, and each battery pack 42 includes: the plurality of battery packs V, the series switch K2, and the parallel switch K1 control the plurality of battery packs V to be connected in series by the series switch K2 when the plurality of battery packs V are connected to the high-voltage charging interface, and control the plurality of battery packs V to be connected in parallel by the parallel switch K1 when the plurality of battery packs V are connected to the discharging interface 14.
Alternatively, in the case where there are a plurality of battery packs 42, at least: a first battery pack 42A and a first battery pack 42B, the first battery pack 42A being connected in series with the first battery pack 42B.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, under the condition of charging the plurality of battery packs, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed simultaneously, so that the plurality of battery packs are connected in series and then connected to the high-voltage charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
As an optional embodiment, the charging interface further includes: a low-voltage charging interface; and the parallel switch is also used for controlling the parallel connection of the plurality of battery packs under the condition that the plurality of battery packs are conducted with the low-voltage charging interface.
As an alternative embodiment, the plurality of battery packs includes at least: a first battery pack and a second battery pack; the parallel switch includes: a first parallel switch and a second parallel switch; the first parallel switch is connected in series with the first end of the first battery pack to obtain a first battery pack circuit; the second parallel switch is connected in series with the second end of the second battery pack to obtain a second battery pack circuit; the first battery pack circuit is connected with the second battery pack circuit in parallel; the first end of the series switch is connected between the first parallel switch and the first battery pack, and the second end of the series switch is connected between the second battery pack and the second parallel switch.
Alternatively, when there are a plurality of battery packs, the plurality of battery packs connected in series are connected between the positive electrode and the negative electrode of the dc bus bar.
For example, the voltage of each battery pack is 175V, if the battery circuit includes two battery packs, each battery pack includes two battery packs, and if the battery pack in the battery circuit is charged, a total of 4 battery packs in the two battery packs are connected in series, where the charging voltage may be 700V; if the battery pack in the battery circuit discharges, the two battery packs in each battery pack are connected in parallel, the discharge voltage of each battery pack is 175V, and the discharge voltage of the two battery packs after being connected in series is 350V.
As an alternative embodiment, the battery pack includes: at least one battery, wherein, in the case that the battery is a plurality of, the plurality of batteries are connected in series.
According to the technical scheme provided by the invention, only simple switch switching control is needed, when the battery pack is charged, the plurality of battery packs in the battery pack are connected in series by using the series switch, the voltage of the battery packs is increased, the required power is increased, and high-power charging equipment is adopted, so that the quick charging and the ultra-quick charging can be realized; when the battery pack is discharged, the parallel switch is utilized to connect the plurality of battery packs in the battery pack in parallel, so that the discharge voltage of the battery pack is reduced, and the low-voltage power supply requirement of the electric automobile is met.
It should be noted that the high voltage and the low voltage (i.e., the high voltage and the low voltage) mentioned in the present application are relative concepts, and there is no specific limit on the voltage limit, which is used to indicate that the charging voltage of the battery pack is higher than the discharging voltage of the battery pack.
In accordance with an embodiment of the present invention, there is provided a method embodiment of control of a battery circuit, it should be noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
Fig. 5 is a flowchart of a control method of a battery circuit according to an embodiment of the present invention, and as shown in fig. 5, the battery circuit includes: the battery circuit of any of the above-described fig. 1-4, the method comprising:
step S502, detecting the working modes of a plurality of battery packs, wherein the working modes at least comprise: a high-voltage charging mode and a discharging mode;
step S504, under the condition that a plurality of battery packs are in a high-voltage charging mode, controlling a charging switch and a series switch to be closed, and controlling a discharging switch and a parallel switch to be disconnected;
in step S506, when the plurality of battery packs are in the discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be opened.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, under the condition of charging the plurality of battery packs, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed simultaneously, so that the plurality of battery packs are connected in series and then connected to the high-voltage charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
As an alternative embodiment, the operation mode further includes: and in the low-voltage charging mode, the charging switch and the parallel switch are controlled to be closed, and the discharging switch and the series switch are controlled to be disconnected under the condition that the plurality of battery packs are in the low-voltage charging mode.
The control method of the battery circuit can be applied to an electric vehicle, and in the process of charging the electric vehicle by using the charging pile, communication between the electric vehicle and the charging pile can be established, so that the battery pack is determined to be in a low-voltage charging mode or a high-voltage charging mode based on a communication result, and the on-off state of a series switch and a parallel switch in the battery circuit is further controlled according to the mode of the battery pack.
Optionally, the detecting the operating modes of the plurality of battery packs includes establishing communication between the battery circuit and the charging pile, and acquiring state information of the charging pile, wherein the state information of the charging pile at least includes: and indicating the battery pack to enter a high-voltage charging mode and indicating the battery pack to enter a low-voltage charging mode.
According to an embodiment of the present invention, there is also provided an embodiment of a control device of a battery circuit, where it is to be noted that the control device of the battery circuit may be configured to execute the control method of the battery circuit in the embodiment of the present invention, and the control method of the battery circuit in the embodiment of the present invention may be executed in the control device of the battery circuit.
Fig. 6 is a schematic diagram of a control apparatus of a battery circuit according to an embodiment of the present invention, as shown in fig. 6, the battery circuit includes: the battery circuit of any of the above-described fig. 1-4, the apparatus comprising: a detection unit 61 for detecting an operation mode of the plurality of battery packs, wherein the operation mode at least includes: a high-voltage charging mode and a discharging mode; a charging control unit 63 for controlling the charging switch and the series switch to be closed and the discharging switch and the parallel switch to be disconnected when the plurality of battery packs are in the high-voltage charging mode; and a discharge control unit 65 for controlling the discharge switch and the parallel switch to be closed and the charge switch and the series switch to be disconnected when the plurality of battery packs are in the discharge mode.
It should be noted that the determination detecting unit 61 in this embodiment may be configured to execute step S502 in this embodiment, the charging control unit 63 in this embodiment may be configured to execute step S504 in this embodiment, and the discharging control unit 65 in this embodiment may be configured to execute step S506 in this embodiment. The above units are the same as the examples and application scenarios realized by the corresponding steps, but are not limited to the disclosure of the above embodiments.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, under the condition of charging the plurality of battery packs, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed simultaneously, so that the plurality of battery packs are connected in series and then connected to the high-voltage charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
As an alternative embodiment, the operation mode further includes: and in the low-voltage charging mode, the charging switch and the parallel switch are controlled to be closed, and the discharging switch and the series switch are controlled to be disconnected under the condition that the plurality of battery packs are in the low-voltage charging mode.
It should be noted that the control device of the battery circuit can be applied to an electric vehicle, and in the process of charging the electric vehicle by using the charging pile, communication between the electric vehicle and the charging pile can be established, so that the battery pack is determined to be in a low-voltage charging mode or a high-voltage charging mode based on a communication result, and then the on-off state or the off-off state of a series switch and a parallel switch in the battery circuit is further controlled according to the mode of the battery pack.
Optionally, the detecting unit includes a communication unit, configured to establish communication between the battery circuit and the charging pile, and acquire state information of the charging pile, where the state information of the charging pile at least includes: and indicating the battery pack to enter a high-voltage charging mode and indicating the battery pack to enter a low-voltage charging mode.
Fig. 7 is a schematic diagram of a control apparatus of a battery circuit according to an embodiment of the present invention, as shown in fig. 7, the battery circuit includes: the battery circuit 71 of any of the above-described fig. 1-4, the apparatus comprising: a controller 73 for controlling operation modes of the plurality of battery packs, wherein the operation modes include: a high-voltage charging mode and a discharging mode; under the condition that the plurality of battery packs are in a high-voltage charging mode, controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected; and under the condition that the plurality of battery packs are in the discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be disconnected.
In the embodiment of the invention, a plurality of battery packs may be connected in series based on the series switch; a plurality of battery packs can be connected in series based on the parallel switch; therefore, when a plurality of battery packs are charged, the discharging switch and the parallel switch are disconnected, and the charging switch and the series switch are closed at the same time, so that the plurality of battery packs are connected in series and then connected to the charging interface, and the charging voltage of the battery packs is increased; under the circumstances of discharging to a plurality of groups of batteries, disconnection charge switch and series switch, closed discharge switch and parallel switch make a plurality of groups of batteries insert the interface that discharges after connecting in parallel simultaneously, reduce the discharge voltage of group of batteries, because can accept higher charging voltage after the group of batteries connects in series, and can not change the discharge voltage of group of batteries after the group of batteries connects in parallel, reached on the basis that does not change group of batteries discharge voltage, make the group of batteries can carry out the purpose of charging based on higher charging voltage, thereby realized carrying out the technological effect that high efficiency charges to the group of batteries based on high charging voltage, and then solved because the charging voltage of unable adjustment group of batteries, and the technical problem that the charge efficiency that leads to the group of batteries is low.
As an alternative embodiment, the operation mode further includes: and in the low-voltage charging mode, the charging switch and the parallel switch are controlled to be closed, and the discharging switch and the series switch are controlled to be disconnected under the condition that the plurality of battery packs are in the low-voltage charging mode.
It should be noted that the control device of the battery circuit can be applied to an electric vehicle, and in the process of charging the electric vehicle by using the charging pile, communication between the electric vehicle and the charging pile can be established, so that the battery pack is determined to be in a low-voltage charging mode or a high-voltage charging mode based on a communication result, and then the on-off state or the off-off state of a series switch and a parallel switch in the battery circuit is further controlled according to the mode of the battery pack.
Optionally, the controller includes a network card for establishing communication between the battery circuit and the charging pile and acquiring state information of the charging pile, where the state information of the charging pile at least includes: and indicating the battery pack to enter a high-voltage charging mode and indicating the battery pack to enter a low-voltage charging mode.
Optionally, the controller is connected to the charge switch, the discharge switch, the series switch and the parallel switch, and is configured to control the on and off of the charge switch, the discharge switch, the series switch and the parallel switch.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A battery circuit, comprising:
a plurality of battery packs;
the switch that charges for control a plurality of groups of batteries switch on with the interface that charges, wherein, the interface that charges is used for a plurality of groups of batteries charge, the interface that charges includes: a high-voltage charging interface;
the series switch is used for controlling the plurality of battery packs to be connected in series under the condition that the plurality of battery packs are conducted with the high-voltage charging interface;
the discharging switch is used for controlling the plurality of battery packs to be conducted with a discharging interface, wherein the discharging interface is used for discharging the plurality of battery packs;
and the parallel switch is used for controlling the plurality of battery packs to be connected in parallel under the condition that the plurality of battery packs are conducted with the discharge interface.
2. The battery circuit of claim 1, wherein the plurality of battery packs comprises at least: a first battery pack and a second battery pack; the parallel switch includes: a first parallel switch and a second parallel switch;
the first parallel switch is connected with the first end of the first battery pack in series to obtain a first battery pack circuit;
the second parallel switch is connected with the second end of the second battery pack in series to obtain a second battery pack circuit;
wherein the first battery pack circuit is connected in parallel with the second battery pack circuit;
the first end of the series switch is connected between the first parallel switch and the first battery pack, and the second end of the series switch is connected between the second battery pack and the second parallel switch.
3. The battery circuit of claim 1, wherein the charging interface further comprises: a low-voltage charging interface;
the parallel switch is further used for controlling the plurality of battery packs to be connected in parallel under the condition that the plurality of battery packs are conducted with the low-voltage charging interface.
4. The battery circuit of claim 3,
under the condition that the charging switch is used for controlling the plurality of battery packs to be conducted with the high-voltage charging interface, the charging switch is linked with the series switch, and the charging switch and the series switch are controlled to be closed or opened together; or
Under the condition that the charging switch is used for controlling the plurality of battery packs to be conducted with the low-voltage charging interface, the charging switch is linked with the parallel switch, and the charging switch and the parallel switch are controlled to be jointly switched on or switched off; or
And under the condition that the discharge switch is used for controlling the plurality of battery packs to be conducted with the discharge interface, the discharge switch is linked with the parallel switch to control the discharge switch and the parallel switch to be jointly switched on or switched off.
5. The battery circuit of claim 1,
the first ends of the plurality of battery packs are connected with the positive electrode of the charging interface through the charging switch;
the second ends of the plurality of battery packs are connected with the negative electrode of the charging interface;
the first ends of the plurality of battery packs are connected with the positive electrode of the discharging interface through the discharging switch;
and the second ends of the plurality of battery packs are connected with the negative electrode of the discharge interface.
6. A battery circuit, comprising:
the switch that charges for control at least one battery package switches on with the interface that charges, wherein, the interface that charges is used for the battery package charges, the interface that charges includes: a high-voltage charging interface;
the discharging switch is used for controlling the conduction of the at least one battery pack and a discharging interface, wherein the discharging interface is used for discharging the battery pack;
wherein, in the case that the battery pack is plural, the plural battery packs are connected in series, and each battery pack includes: the battery pack charging system comprises a plurality of battery packs, a series switch and a parallel switch, wherein the plurality of battery packs are controlled to be connected in series through the series switch under the condition that the plurality of battery packs are connected with a high-voltage charging interface, and the plurality of battery packs are controlled to be connected in parallel through the parallel switch under the condition that the plurality of battery packs are connected with a discharging interface.
7. The battery circuit of claim 6, wherein the plurality of battery packs comprises at least: a first battery pack and a second battery pack; the parallel switch includes: a first parallel switch and a second parallel switch;
the first parallel switch is connected with the first end of the first battery pack in series to obtain a first battery pack circuit;
the second parallel switch is connected with the second end of the second battery pack in series to obtain a second battery pack circuit;
wherein the first battery pack circuit is connected in parallel with the second battery pack circuit;
the first end of the series switch is connected between the first parallel switch and the first battery pack, and the second end of the series switch is connected between the second battery pack and the second parallel switch.
8. A control method of a battery circuit, the battery circuit comprising: the battery circuit of any of claims 1-7, the method comprising:
detecting an operation mode of the plurality of battery packs, wherein the operation mode at least comprises: a high-voltage charging mode and a discharging mode;
under the condition that the plurality of battery packs are in a high-voltage charging mode, controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected;
and under the condition that the plurality of battery packs are in a discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be disconnected.
9. A control apparatus of a battery circuit, characterized in that the battery circuit comprises: the battery circuit of any of claims 1 to 7, the apparatus comprising:
a detection unit for detecting an operation mode of the plurality of battery packs, wherein the operation mode at least includes: a high-voltage charging mode and a discharging mode;
the charging control unit is used for controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected under the condition that the plurality of battery packs are in a high-voltage charging mode;
and the discharge control unit is used for controlling the discharge switch and the parallel switch to be closed and controlling the charging switch and the series switch to be disconnected under the condition that the plurality of battery packs are in a discharge mode.
10. A control apparatus of a battery circuit, characterized in that the battery circuit comprises: the battery circuit of any of claims 1-7, the apparatus further comprising:
a controller for controlling an operation mode of the plurality of battery packs,
wherein the operating modes include: a high-voltage charging mode and a discharging mode; under the condition that the plurality of battery packs are in a high-voltage charging mode, controlling the charging switch and the series switch to be closed and controlling the discharging switch and the parallel switch to be disconnected; and under the condition that the plurality of battery packs are in a discharging mode, the discharging switch and the parallel switch are controlled to be closed, and the charging switch and the series switch are controlled to be disconnected.
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