CN114336802A - Charging control method and system and battery replacement station - Google Patents
Charging control method and system and battery replacement station Download PDFInfo
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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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- 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
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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
- 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
- Y02T90/12—Electric charging stations
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Abstract
The invention provides a charging control method, a charging control system and a power changing station, wherein the method comprises the following steps: acquiring a current electric quantity value of a standby battery pack and a state parameter of a power grid of a power conversion station; sending the current electric quantity value and the state parameter to an energy management system; acquiring a first control signal sent by an energy management system, wherein the first control signal is generated under the condition that the grid connection state is realized and the current electric quantity value is greater than or equal to a first preset electric quantity value; and according to the first control signal, controlling a contactor in the standby battery pack to be disconnected and controlling the power grid of the battery replacement station to stop charging the standby battery pack. When the current electric quantity value of the standby battery pack is larger than or equal to the first preset electric quantity value, the electric quantity of the battery pack is sufficient. If the battery pack is in a grid-connected state, the contactor in the standby battery pack can be controlled to be disconnected and the power grid of the battery replacement station can be controlled to stop charging the standby battery pack according to the first control signal. The charging control mode can avoid the problem of safety accidents caused by the overcharge of the standby battery pack.
Description
Technical Field
The invention relates to the field of standby power, in particular to a charging control method and system and a power changing station.
Background
With the continuous popularization of new energy automobiles, the proportion of new energy automobiles for going out is continuously improved. In the driving new energy trip process, if the electric quantity of the power battery is insufficient, the charging pile needs to be adopted for charging. However, the charging process often lasts for several hours, which brings a poor use experience to the driver. In order to solve the problems, some manufacturers start to release the power exchanging station, and the power battery is replaced by replacing the power battery with a power battery replacing mode, so that the time for replenishing electric quantity is shortened.
And the battery replacement equipment in the battery replacement station adopts the electricity in the power grid as a power source so as to perform battery replacement operation. In order to avoid the power grid being disconnected when the battery replacement device performs a battery replacement operation, a standby power source, such as a power battery pack (also referred to as a standby battery pack) of an electric vehicle, is also used in a general battery replacement station. However, the power battery pack is used as a standby power supply, and when the power grid is in a grid-connected state, the power battery pack is always in a charging state, so that the power battery pack is easily overcharged, and further safety accidents are caused. How to solve the above problems needs to be considered.
Disclosure of Invention
The invention provides a charging control method, a charging control device and a power changing station, and solves the problems that in the prior art, a power battery pack is used as a standby power supply, and when a power grid is in a grid-connected state, the power battery pack is always in a charging state, the power battery pack is easily overcharged, and further safety accidents are caused.
In order to solve the above problem, an embodiment of the present invention provides a charging control method applied to a battery pack management unit, the method including: acquiring a current electric quantity value of a standby battery pack and a state parameter of a power grid of a power conversion station;
sending the current electric quantity value and the state parameter to an energy management system;
acquiring a first control signal sent by the energy management system, wherein the first control signal is generated under the condition that the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value;
and according to the first control signal, controlling a contactor in the standby battery pack to be disconnected and controlling the power grid of the battery replacement station to stop charging the standby battery pack.
Optionally, the method further includes: acquiring a second control signal sent by the energy management system, wherein the second control signal is generated under the condition that the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state;
and controlling the power grid of the battery replacement station to charge the standby battery pack according to the second control signal.
Optionally, the method further includes: acquiring a third control signal sent by the energy management system, wherein the third control signal is generated when the state parameter is in an off-grid state;
and controlling a contactor in the standby battery pack to be closed and controlling the standby battery pack to discharge at high voltage according to the third control signal, wherein the standby battery pack supplies power to a battery replacement device in the battery replacement station when discharging at high voltage.
Optionally, the method further includes: acquiring a fourth control signal sent by the energy management system, wherein the fourth control signal is generated when the state parameter is switched from an off-grid state to a grid-connected state;
and controlling the standby battery pack to stop high-voltage discharge according to the fourth control signal.
Another embodiment of the present invention provides a charging control method applied to an energy management system, including: acquiring state parameters sent by a battery pack management unit and a current electric quantity value of a standby battery pack;
when the power grid state is determined to be a grid-connected state and the current electric quantity value is larger than or equal to a first preset electric quantity value, a first control signal is sent to the battery pack management unit, and the first control signal is used for disconnecting a contactor in the standby battery pack and enabling the power station power grid to stop charging the standby battery pack.
Optionally, the method further includes: and when the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state, sending a second control signal to the battery pack management unit, wherein the second control signal is used for enabling the power exchange station power grid to charge the standby battery pack.
Optionally, the method further includes: and when the state parameter is determined to be in the off-grid state, sending a third control signal to the battery pack management unit, wherein the third control signal is used for closing a contactor in the standby battery pack and discharging the standby battery pack at high voltage.
Optionally, the method further includes: and when the state parameter is determined to be switched from the off-grid state to the grid-connected state, sending a fourth control signal to the battery pack management unit, wherein the fourth control signal is used for stopping high-voltage discharge of the standby battery pack.
Another embodiment of the present invention provides a battery pack management unit including: the first acquisition module is used for acquiring the current electric quantity value of the standby battery pack and the state parameters of the power grid of the power exchanging station;
the first sending module is used for sending the current electric quantity value and the state parameter to an energy management system;
the second obtaining module is used for obtaining a first control signal sent by the energy management system, wherein the first control signal is generated under the condition that the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value;
and the control module controls a contactor in the standby battery pack to be disconnected and controls the power grid of the battery replacement station to stop charging the standby battery pack according to the first control signal.
Another embodiment of the present invention provides an energy management system, including: the third acquisition module is used for acquiring the state parameters sent by the battery pack management unit and the current electric quantity value of the standby battery pack;
and the second sending module is used for sending a first control signal to the battery pack management unit when the power grid state is determined to be a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value, wherein the first control signal is used for disconnecting a contactor in the standby battery pack and stopping the charging of the power grid of the battery replacement station to the standby battery pack.
Still another embodiment of the present invention provides a charge control system including: a battery pack management unit as described above and an energy management system as described above.
Another embodiment of the present invention provides a charging station, including the charging control system as described above.
The technical scheme of the invention has at least the following beneficial effects:
when the current electric quantity value of the standby battery pack is larger than or equal to the first preset electric quantity value, the electric quantity of the battery pack is sufficient. If the battery pack is in a grid-connected state, the contactor in the standby battery pack can be controlled to be disconnected and the power grid of the battery replacement station can be controlled to stop charging the standby battery pack according to the first control signal. The charging control mode can avoid the problems of safety accidents caused by over-charging of the standby battery pack, easy damage of the battery pack and influence on the service life of the battery pack.
Drawings
Fig. 1 is a schematic diagram of a charging control system according to the present invention;
fig. 2 is a schematic diagram of another charging control system according to the present invention;
fig. 3 is a schematic flow chart of a charging control method according to the present invention;
fig. 4 is a second flowchart of a charging control method according to the present invention;
fig. 5 is a third schematic flow chart of a charging control method according to the present invention;
fig. 6 is a schematic block diagram of a battery pack management unit according to the present invention;
fig. 7 is a block diagram of an energy management system according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to A" means that B is associated with A from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Fig. 1 is a schematic diagram of a charging control system according to the present invention. The method specifically comprises the following steps:
the charging and discharging control System comprises a charging and discharging control Unit, a battery Pack Management Unit (PMU), an Energy Management System (EMS), a power supply module, a standby battery Pack and a power grid of a battery replacement station.
The charging and discharging control unit is respectively connected with the battery pack management unit and the standby battery pack, the battery pack management unit is respectively connected with the standby battery pack and the energy management system, and the power supply module is used for supplying power to the charging and discharging control unit, the battery pack management unit and the energy management system.
And the charging and discharging control unit is connected with the power grid of the battery replacement station and can send the state parameters of the power grid of the battery replacement station to the battery pack management unit. The battery pack management unit can acquire the current electric quantity value of the standby battery pack and send the state parameters and the current electric quantity value to the energy management system. And the energy management system processes and determines the state parameters and the current electric quantity value when receiving the state parameters and the current electric quantity value, and then outputs a control signal to the battery pack management unit. The battery pack management unit may control charging and discharging of the backup battery pack, and the like, based on a control signal transmitted from the energy management system, or may control the charging and discharging control unit to charge or stop charging the backup battery pack, and the like.
The power grid of the battery replacement station is mainly used for supplying power to battery replacement equipment in the battery replacement station, and the battery replacement equipment can execute battery replacement operation by using electric energy provided by the power grid of the battery replacement station. The battery replacement operation means that the battery replacement equipment takes down the power battery with lower electric quantity of the electric automobile in the battery replacement station and replaces the power battery with higher electric quantity.
The following is described in detail with reference to several examples:
in an example one, the energy management system is further configured to send a first control signal to the battery pack management unit when it is determined that the state parameter is a grid-connected state and the electric quantity value is greater than or equal to a first preset electric quantity value;
the battery pack management unit is further used for controlling a contactor in the standby battery pack to be disconnected and controlling the charging and discharging control unit to stop charging the standby battery pack according to the first control signal;
and the charging and discharging control unit is also used for stopping charging the standby battery pack according to the control of the battery pack management unit.
The state parameters comprise a grid-connected state and an off-grid state, the power grid of the power conversion station can supply power to the power conversion equipment and charge the standby battery pack in the grid-connected state, and the power grid of the power conversion station cannot supply power to the power conversion equipment and charge the standby battery pack in the off-grid state.
The first preset electric quantity value may be, for example, 90% or 96% or 100%, and when the current electric quantity value of the backup battery pack is greater than or equal to the first preset electric quantity value, it indicates that the electric quantity of the backup battery pack is sufficient.
When the standby battery pack is used as a standby power supply of the battery replacement station, a contactor in the standby battery pack is required to be always in a connection state. However, when the power grid of the battery replacement station is in a grid-connected state and the contactor is always in a connected state, the power grid of the battery replacement station can always charge the standby battery pack, and the charging process is not controlled.
The energy management system sends a first control signal to the battery pack management unit when the power grid of the battery replacement station is confirmed to be in a grid-connected state and the current electric quantity value of the standby battery pack is larger than or equal to a first preset electric quantity value. The battery pack management unit controls a contactor in the standby battery pack to be disconnected and controls the power grid of the battery replacement station to stop charging the standby battery pack according to the first control signal, so that the situation that the power grid of the battery replacement station always charges the standby battery pack in a grid-connected state can be avoided. Thereby avoiding the overcharge of the standby battery pack and preventing the occurrence of safety accidents. Moreover, the over-charging of the standby battery pack is avoided, the damage to the standby battery pack caused by the over-charging can be prevented, and the service life of the standby battery pack is prolonged.
In a second example, the energy management system is further configured to send a second control signal to the battery pack management unit when it is determined that the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state;
the battery pack management unit is further used for controlling the charging and discharging control unit to charge the standby battery pack according to the second control signal.
When the current electric quantity value of the standby battery pack is smaller than the first preset electric quantity value, the situation that the electric quantity of the standby battery pack is insufficient is indicated. The battery pack management unit controls the power grid of the battery replacement station to charge the standby battery pack according to a second control signal sent by the energy management system, so that the standby battery pack can be charged, more electric quantity can be stored in the standby battery pack, and the discharge time of the standby battery pack as a standby power supply is prolonged in an off-grid state.
In a third example, the energy management system is further configured to send a third control signal to the battery pack management unit when it is determined that the state parameter is in an off-network state;
the battery pack management unit is further configured to control the standby battery pack to perform high-voltage discharge according to the third control signal, wherein the standby battery pack supplies power to a battery replacement device in the battery replacement station when performing high-voltage discharge.
When the battery swapping device performs the battery swapping operation, if the power grid of the battery swapping station becomes an off-grid state, the battery swapping device (which is a load shown in fig. 2) cannot continue to work, and thus the battery swapping device cannot complete the battery swapping operation. In the off-grid state, the battery pack management unit can control the contactor to be closed and control the high-voltage discharge of the standby battery pack according to a third control signal sent by the energy management system. The standby battery pack can be used as a standby power supply to supply power to the battery replacement equipment, so that the battery replacement equipment is ensured to finish the battery replacement operation. Of course, after the current battery replacement operation is completed, the battery replacement device may also continue to perform the battery replacement operation on a subsequent vehicle by using the electric energy provided by the battery replacement device.
In the high-voltage discharge process of the standby battery pack, if the electric quantity value of the standby battery pack is smaller than or equal to a second preset electric quantity value, wherein the second preset electric quantity value can be 10% or 7% or 5%, for example, the EMS outputs alarm information, and after a preset time period, outputs a control signal for controlling the standby battery pack to stop high-voltage discharge to the PMU. And after the PMU executes the control signal, the standby battery pack stops high-voltage discharge. The battery pack is prevented from being over-placed, and the service life of the standby battery pack is prevented from being influenced. The alarm information may be, for example, a voice prompt or an alarm light prompt. Through the alarm information, can arouse staff's attention. After the preset time period, the standby battery pack is controlled to stop high-voltage discharge, and the time for executing the battery replacement operation of the battery replacement equipment can be reserved. Wherein the preset duration can be set. For example, the preset time periods are 60s, 90s and 120 s. Optionally, the setting of the preset duration may be determined according to actual conditions on site.
Optionally, if the worker does not find the alarm information in time, after the standby battery pack stops high-voltage discharge, the battery replacement device does not complete the battery replacement operation. The staff can control the high-voltage discharge of the standby battery pack again through manual control, so that the power supply of the battery replacement equipment is continued. After the battery replacing device completes the battery replacing operation, the staff can control the high-voltage reduction of the battery replacing device through manual control.
In a fourth example, the energy management system is further configured to send a fourth control signal to the battery pack management unit when it is determined that the state parameter is switched from an off-grid state to a grid-connected state;
and the battery pack management unit is also used for controlling the standby battery pack to stop high-voltage discharge according to the fourth control signal.
When the standby battery pack is used as a standby power supply to supply power to the battery replacement equipment, if the state parameter is switched from the off-grid state to the grid-connected state, the standby battery pack is controlled to stop high-voltage discharge according to a fourth control signal. At the moment, the power conversion equipment is powered by a power grid of the power conversion station.
After the high-voltage discharge of the backup battery pack is stopped, the electric quantity value of the backup battery pack may be smaller than the first preset electric quantity value or not smaller than the first preset electric quantity value. Subsequently, the above-mentioned content may be repeatedly executed, for example, if the current electric quantity value of the backup battery pack is smaller than the first preset electric quantity value and the power grid is in a grid-connected state, the power grid of the battery replacement station is controlled to charge the backup battery pack.
Further, on the basis of fig. 1, as shown in fig. 2, the present invention provides a schematic structural diagram of another charging control system. Specifically, the method comprises the following steps:
the power supply module in fig. 1 includes: the battery, UPS (UPS) submodule and AC220V/DC12V submodule, the battery provides 220V alternating current for EMS. The uninterruptible power supply submodule is connected with the AC220V/DC12V submodule, and the AC220V/DC12V submodule converts 220v alternating current into 12v direct current to supply power for the battery pack management unit and the charging and discharging module controller.
The energy management system in fig. 1 may also be referred to as a master control system in fig. 2 or located in the master control system, and the EMS is a processing unit of all control logics, configured to schedule the battery pack management unit to control the charge and discharge module controller and the standby battery pack.
The PMU and the backup battery pack in FIG. 1 are combined, the PMU controls the power supply and the awakening of the backup battery pack, meanwhile, a two-way Controller Area Network (CAN) communication is adopted between the PMU and the backup battery pack, the PMU and the backup battery pack are respectively a Fast Charge BUS (FCBUS) and an Electric Vehicle BUS (EVBUS), the FCBUS adopts a GBT27930 national standard protocol to carry out charging information interaction, and the EVBUS adopts a battery pack custom protocol to carry out the guiding of charging and discharging of the battery pack, direct current charging and discharging.
The charge and discharge control unit in fig. 1 includes: the charging and discharging control system comprises a charging and discharging module controller, an Alternating current/Direct current converter (AC/DC) and a Direct current/Direct current converter (DC/DC), wherein the AC/DC and the DC/DC are both bidirectional controllable units, and the charging and discharging control module controls the AC/DC and the DC/DC to be in a rectifying charging mode or an inverting output mode.
Next, the process of the charging control will be described in detail with reference to fig. 2.
1. The charging and discharging module controller obtains state parameters of a power grid, the state parameters of the power grid are sent to the EMS through the PMU, and the EMS judges the state parameters; and the PMU sends the acquired current electric quantity of the standby battery pack to the EMS. The PMU and the charging and discharging module controller and the PMU and the EMS CAN be communicated through the CAN.
2. The detailed description is directed to an example one in which the energy management system transmits the first control signal to the battery pack management unit as mentioned in fig. 1.
When the current electric quantity of the standby battery pack is larger than or equal to a first preset electric quantity value and the state parameter is in a grid-connected state, the EMS sends a first control signal to the PMU. The PMU guides the standby battery pack to carry out high-voltage power-off according to the first control signal, controls the charging and discharging control unit to stop charging the standby battery pack, and controls the contactor in the standby battery pack to be disconnected, so that the charging operation is completed.
3. The second example of the energy management system sending the second control signal to the battery pack management unit, which is mentioned in fig. 1, will be described in detail.
When the state parameter is in a grid-connected state, the EMS sends a second control signal to the battery pack management unit when determining that the current electric quantity value of the standby battery pack is smaller than a first preset electric quantity value. The PMU controls the AC/DC and the DC/DC to carry out direct current charging on the standby battery pack according to the second control signal, the PMU carries out national standard charging handshake with the standby battery pack through the FCBUS, and meanwhile carries out national standard charging power-on guidance on the standby battery pack through the EVBUS.
On the other hand, the PMU communicates with the charge and discharge module controller, so that the charge and discharge module controller is in a rectification charging mode, charging parameter configuration is carried out according to the information of the standby battery pack, for example, charging voltage and charging current are configured, and then direct current charging is started.
4. The third example of the energy management system sending the third control signal to the battery pack management unit mentioned in fig. 1 will be described in detail.
And when determining that the state parameter is in the off-network state, the EMS sends a third control signal to the PMU. And if the standby battery pack is still in a charging state, the PMU controls the standby battery pack to carry out high-voltage power-off operation according to the third control signal, and the charging process is ended. Then PMU carries out high-voltage electrification guide to the standby battery pack through EVBUS, so that the standby battery pack is electrified at high voltage.
On the other hand, the EMS schedules the PMU to control the cut-off and/or off-grid contactor, and meanwhile, the PMU communicates with the charge and discharge module controller, so that the charge and discharge module controller is in an inversion mode, performs discharge parameter configuration according to the information of the standby battery pack, and then starts high-voltage discharge.
5. For what is mentioned in fig. 1: the fourth example in which the energy management system transmits the fourth control signal to the battery pack management unit will be described in detail.
And in the high-voltage discharging process of the standby battery pack, when the EMS determines that the state parameters are switched from the off-network state to the on-network state, the EMS sends a fourth control signal to the PMU. And the PMU controls the standby battery pack to perform high-voltage power-down operation according to the fourth control signal.
On the other hand, the PMU communicates with the charge-discharge module controller, controls the charge-discharge module controller to be in a rectification charging mode, and then restarts to perform direct-current charging on the standby battery pack.
Optionally, when the standby battery pack reaches a discharge cutoff condition, for example, the current electric quantity of the standby battery pack is smaller than a second preset electric quantity value, the current voltage value of the standby battery pack is smaller than a preset voltage value, and/or the standby battery pack fails, the PMU controls the standby battery pack to discharge electricity at a high voltage, and the EMS controls all controllers (such as the charge and discharge module controller, the PMU, and the controller that obtains electric energy through the standby battery pack) to perform power discharge operation at a low voltage. And prompt the condition that the electric quantity of the standby battery pack is about to be used up, such as voice prompt and light prompt.
Referring next to fig. 3, another embodiment of the present invention provides a charging control method for a backup power supply, applied to a battery pack management unit, including the following steps:
s301: and acquiring the current electric quantity value of the standby battery pack and the state parameters of the power grid of the power conversion station.
S302: and sending the current electric quantity value and the state parameter to an energy management system.
S303: and acquiring a first control signal sent by the energy management system, wherein the first control signal is generated under the condition that the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value.
S304: and according to the first control signal, controlling a contactor in the standby battery pack to be disconnected and controlling the power grid of the battery replacement station to stop charging the standby battery pack.
Illustratively, the method further comprises: acquiring a second control signal sent by the energy management system, wherein the second control signal is generated under the condition that the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state; and controlling the power grid of the battery replacement station to charge the standby battery pack according to the second control signal.
Illustratively, the method further comprises: acquiring a third control signal sent by the energy management system, wherein the third control signal is generated when the state parameter is in an off-grid state; and controlling a contactor in the standby battery pack to be closed and controlling the standby battery pack to discharge at high voltage according to the third control signal, wherein the standby battery pack supplies power to a battery replacement device in the battery replacement station when discharging at high voltage.
Illustratively, the method further comprises: acquiring a fourth control signal sent by the energy management system, wherein the fourth control signal is generated when the state parameter is switched from an off-grid state to a grid-connected state; and controlling the standby battery pack to stop high-voltage discharge according to the fourth control signal.
As shown in fig. 4, another embodiment of the present invention provides a charging control method for a backup power supply, applied to an energy management system, including the following steps:
s401: and acquiring the state parameters sent by the battery pack management unit and the current electric quantity value of the standby battery pack.
S402: when the power grid state is determined to be a grid-connected state and the current electric quantity value is larger than or equal to a first preset electric quantity value, a first control signal is sent to the battery pack management unit, and the first control signal is used for disconnecting a contactor in the standby battery pack and enabling the power station power grid to stop charging the standby battery pack.
Illustratively, the method further comprises: and when the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state, sending a second control signal to the battery pack management unit, wherein the second control signal is used for enabling the power exchange station power grid to charge the standby battery pack.
Illustratively, the method further comprises: and when the state parameter is determined to be in the off-grid state, sending a third control signal to the battery pack management unit, wherein the third control signal is used for closing a contactor in the standby battery pack and discharging the standby battery pack at high voltage.
Illustratively, the method further comprises: and when the state parameter is determined to be switched from the off-grid state to the grid-connected state, sending a fourth control signal to the battery pack management unit, wherein the fourth control signal is used for stopping high-voltage discharge of the standby battery pack.
As shown in fig. 5, another embodiment of the present invention further provides a charging control method, including the following steps: the execution subject of the method can be regarded as the combination of the charge and discharge control unit, the energy management system and the battery pack management unit in fig. 1.
S501: and acquiring the current electric quantity value of the standby battery pack and the state parameters of the power grid of the power conversion station.
S502: and when the state parameter is determined to be a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value, controlling a contactor in the standby battery pack to be disconnected and controlling the power conversion station power grid to stop charging the standby battery pack.
Illustratively, the method further comprises: and when the current electric quantity value is determined to be smaller than the first preset electric quantity value and the state parameter is in a grid-connected state, controlling the power grid of the power conversion station to charge the standby battery pack.
Illustratively, the method further comprises: and when the state parameter is determined to be in an off-grid state, controlling a contactor in the standby battery pack to be closed and controlling the high-voltage discharge of the standby battery pack.
Illustratively, the method further comprises: and when the state parameter is determined to be switched from the off-grid state to the grid-connected state, controlling the standby battery pack to stop high-voltage discharge.
As shown in fig. 6, another embodiment of the present invention provides a battery pack management unit, including:
the first obtaining module 601 is configured to obtain a current electric quantity value of the standby battery pack and a state parameter of a power grid of the power exchanging station;
a first sending module 602, configured to send the current electric quantity value and the state parameter to an energy management system;
a second obtaining module 603, configured to obtain a first control signal sent by the energy management system, where the first control signal is generated when the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value;
the control module 604 is configured to control a contactor in the standby battery pack to be disconnected and control the power grid of the battery replacement station to stop charging the standby battery pack according to the first control signal.
Optionally, the second obtaining module 603 is further configured to: acquiring a second control signal sent by the energy management system, wherein the second control signal is generated under the condition that the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state;
the control module 604 is further configured to control the power grid of the battery replacement station to charge the backup battery pack according to the second control signal.
Optionally, the second obtaining module 603 is further configured to: acquiring a third control signal sent by the energy management system, wherein the third control signal is generated when the state parameter is in an off-grid state;
the control module 604 is further configured to control a contactor in the backup battery pack to be closed and control the backup battery pack to perform high-voltage discharge according to the third control signal, where the backup battery pack supplies power to a battery replacement device in the battery replacement station when performing the high-voltage discharge.
Optionally, the second obtaining module 603 is further configured to: acquiring a fourth control signal sent by the energy management system, wherein the fourth control signal is generated when the state parameter is switched from an off-grid state to a grid-connected state;
the control module 604 is further configured to control the backup battery pack to stop high-voltage discharge according to the fourth control signal.
As shown in fig. 7, another embodiment of the present invention provides an energy management system, including:
a third obtaining module 701, configured to obtain a state parameter sent by the battery pack management unit and a current electric quantity value of the standby battery pack;
a second sending module 702, configured to send a first control signal to the battery pack management unit when it is determined that the power grid state is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value, where the first control signal is used to disconnect a contactor in the standby battery pack and stop the charging of the battery replacement station power grid to the standby battery pack.
Illustratively, the second sending module 702 is further configured to: and when the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state, sending a second control signal to the battery pack management unit, wherein the second control signal is used for enabling the power exchange station power grid to charge the standby battery pack.
Illustratively, the second sending module 702 is further configured to: and when the state parameter is determined to be in the off-grid state, sending a third control signal to the battery pack management unit, wherein the third control signal is used for closing a contactor in the standby battery pack and discharging the standby battery pack at high voltage.
Illustratively, the second sending module 702 is further configured to: and when the state parameter is determined to be switched from the off-grid state to the grid-connected state, sending a fourth control signal to the battery pack management unit, wherein the fourth control signal is used for stopping high-voltage discharge of the standby battery pack.
Another embodiment of the present invention provides a charge control system including: a battery pack management unit as described above and an energy management system as described above.
Still another embodiment of the invention provides a charging station comprising the charging control system.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A charging control method is applied to a battery pack management unit, and comprises the following steps:
acquiring a current electric quantity value of a standby battery pack and a state parameter of a power grid of a power conversion station;
sending the current electric quantity value and the state parameter to an energy management system;
acquiring a first control signal sent by the energy management system, wherein the first control signal is generated under the condition that the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value;
and according to the first control signal, controlling a contactor in the standby battery pack to be disconnected and controlling the power grid of the battery replacement station to stop charging the standby battery pack.
2. The charge control method according to claim 1, characterized by further comprising:
acquiring a second control signal sent by the energy management system, wherein the second control signal is generated under the condition that the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state;
and controlling the power grid of the battery replacement station to charge the standby battery pack according to the second control signal.
3. The charge control method according to claim 1, characterized by further comprising:
acquiring a third control signal sent by the energy management system, wherein the third control signal is generated when the state parameter is in an off-grid state;
and controlling a contactor in the standby battery pack to be closed and controlling the standby battery pack to discharge at high voltage according to the third control signal, wherein the standby battery pack supplies power to a battery replacement device in the battery replacement station when discharging at high voltage.
4. The charge control method according to claim 1, characterized by further comprising:
acquiring a fourth control signal sent by the energy management system, wherein the fourth control signal is generated when the state parameter is switched from an off-grid state to a grid-connected state;
and controlling the standby battery pack to stop high-voltage discharge according to the fourth control signal.
5. A charging control method is applied to an energy management system, and comprises the following steps:
acquiring state parameters sent by a battery pack management unit and a current electric quantity value of a standby battery pack;
when the power grid state is determined to be a grid-connected state and the current electric quantity value is larger than or equal to a first preset electric quantity value, a first control signal is sent to the battery pack management unit, and the first control signal is used for disconnecting a contactor in the standby battery pack and enabling the power station power grid to stop charging the standby battery pack.
6. The charge control method according to claim 5, characterized by further comprising:
and when the current electric quantity value is smaller than the first preset electric quantity value and the state parameter is in a grid-connected state, sending a second control signal to the battery pack management unit, wherein the second control signal is used for enabling the power exchange station power grid to charge the standby battery pack.
7. The charge control method according to claim 5, characterized by further comprising:
and when the state parameter is determined to be in the off-grid state, sending a third control signal to the battery pack management unit, wherein the third control signal is used for closing a contactor in the standby battery pack and discharging the standby battery pack at high voltage.
8. The charge control method according to claim 5, characterized by further comprising:
and when the state parameter is determined to be switched from the off-grid state to the grid-connected state, sending a fourth control signal to the battery pack management unit, wherein the fourth control signal is used for stopping high-voltage discharge of the standby battery pack.
9. A battery pack management unit, comprising:
the first acquisition module is used for acquiring the current electric quantity value of the standby battery pack and the state parameters of the power grid of the power exchanging station;
the first sending module is used for sending the current electric quantity value and the state parameter to an energy management system;
the second obtaining module is used for obtaining a first control signal sent by the energy management system, wherein the first control signal is generated under the condition that the state parameter is a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value;
and the control module controls a contactor in the standby battery pack to be disconnected and controls the power grid of the battery replacement station to stop charging the standby battery pack according to the first control signal.
10. An energy management system, comprising:
the third acquisition module is used for acquiring the state parameters sent by the battery pack management unit and the current electric quantity value of the standby battery pack;
and the second sending module is used for sending a first control signal to the battery pack management unit when the power grid state is determined to be a grid-connected state and the current electric quantity value is greater than or equal to a first preset electric quantity value, wherein the first control signal is used for disconnecting a contactor in the standby battery pack and stopping the charging of the power grid of the battery replacement station to the standby battery pack.
11. A charge control system, comprising: the battery pack management unit according to claim 9 and the energy management system according to claim 10.
12. A charging station comprising the charge control system of claim 11.
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