CN113765163A - A control method, device and system for a whole-package echelon battery energy storage charging system - Google Patents

Abstract

The invention provides a control method, device and system for an energy storage charging system for a whole package of echelon batteries. Including the stored power of the echelon battery energy storage charging system, the vehicle charging mode is determined; after the fast charging gun is connected to the vehicle, the charging demand power is obtained according to the charging request information of the vehicle; and at least one target DC chopper is determined according to the charging demand power, According to the vehicle charging mode, one end of the target DC chopper is controlled to be connected to the fast charging gun through the fast charging DC bus, and the other end is connected to the target battery pack or power grid. The whole-package echelon battery energy storage charging system provided by the present invention increases the charging pile function, and only needs to change the structure connected at both ends of the target DC chopper when charging the vehicle, and then the vehicle can be charged, and In the energy storage charging mode, it is beneficial to improve the charging efficiency and reduce the charging cost.

Description

A control method, device and system for a whole-package echelon battery energy storage charging system

technical field

The invention relates to the technical field of energy storage of a whole package of echelon batteries, in particular to a control method, device and system of an energy storage and charging system of a whole package of echelon batteries.

Background technique

With the continuous development of electric vehicles, the number of decommissioned waste power battery packs is also increasing. In order to effectively utilize waste power battery packs, the whole pack echelon battery energy storage technology came into being. The battery energy storage technology is only used for energy storage and feeding power to the power grid. How to develop the whole package of cascade battery energy storage technology, add the function of the charging pile on the basis of its original function, and use the electric energy efficiently, become a person skilled in the art A big problem to be solved.

SUMMARY OF THE INVENTION

The technical purpose to be achieved by the embodiments of the present invention is to provide a control method, device and system for a whole-package cascade battery energy storage charging system, so as to solve the problem that the current whole-package cascade battery energy storage technology is only used for energy storage and feeding power to the power grid , it is impossible to realize the problem of efficient utilization of electric energy after adding the function of charging pile.

In order to solve the above technical problems, an embodiment of the present invention provides a control method for a whole-package echelon battery energy storage charging system, which is applied to a control device, including:

When it is detected that the fast charging gun is pulled out of the charging gun base, obtain the first electricity price peak and valley period corresponding to the first current time and the first stored electricity of the whole package of echelon battery energy storage and charging system, and according to the first electricity price peak and valley The time period and the first stored amount of electricity are used to determine the vehicle charging mode in which the entire package of echelon battery energy storage and charging system charges the vehicle;

When it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, the charging request information sent by the vehicle is received, and the charging demand power of the vehicle is obtained according to the charging request information;

determining at least one target DC chopper from the plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power;

When the vehicle charging mode is the energy storage to vehicle charging mode, the first end of the control target DC chopper is connected to the fast charging gun through the first fast charging DC bus, and the second end is connected to the target battery pack corresponding to the target DC chopper or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end is connected to the grid through a bidirectional AC-DC converter Connect to the energy storage DC bus.

Preferably, in the above-mentioned control method, the step of determining the vehicle charging mode for charging the vehicle by the whole-package echelon battery energy storage charging system according to the first electricity price peak-valley period and the first stored electric quantity includes:

When the first electricity price peak and valley period is the valley period, determining that the vehicle charging mode is the grid-to-vehicle charging mode;

When the first electricity price peak-valley period is a non-valley period, if the first stored power is greater than the preset power threshold, it is determined that the vehicle charging mode is the energy storage to vehicle charging mode; otherwise, the charging mode is determined to be the grid-to-vehicle charging mode.

Specifically, in the above-mentioned control method, the steps of controlling the first end of the target DC chopper to be connected to the fast charging gun through the first fast charging DC bus, and the second end being connected to the target battery pack include:

controlling the first control switch disposed between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus to switch to a state where the target DC chopper is connected to the first fast charging DC bus, The second control switch disposed between the second end of the target DC chopper, the target battery pack and the second fast-charging DC bus is controlled to switch to a state where the target DC chopper is connected to the target battery pack.

Specifically, in the above control method, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end is connected to the power grid through the energy storage DC bus and the bidirectional AC-DC converter The steps include:

controlling the second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast-charging DC bus to switch to a state where the target DC chopper is connected to the second fast-charging DC bus, and The first control switch between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus is controlled to switch to a state where the target DC chopper is connected to the bidirectional AC-DC converter.

Preferably, in the above-mentioned control method, after the step of determining the vehicle charging mode for charging the vehicle by the entire package of echelon battery energy storage charging system according to the first electricity price peak-valley period and the first stored electric quantity, the control method further includes:

When the charging mode is the energy storage to vehicle charging mode, control the third control switch arranged between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun to switch between the first fast charging DC bus and the fast charging gun. The status of the charging gun connection;

Alternatively, when the charging mode is the grid-to-vehicle charging mode, the third control switch is controlled to switch to a state in which the second fast-charging DC bus is connected to the fast-charging gun.

Specifically, the above control method further includes: during the charging process of the vehicle, when it is detected that the electricity price peak-to-valley period is switched, maintaining the current vehicle charging mode.

Preferably, the above control method further includes:

When receiving the end charging information sent by the vehicle, the current vehicle charging mode is switched to the previous standby working mode, and the standby working mode is the working mode when the fast charging gun is located in the charging gun base.

Further, the above-mentioned control method further includes: when receiving the charging end information sent by the vehicle, controlling the third control switch to switch to a disconnected state.

Preferably, the above control method further includes:

When it is detected that the fast charging gun is located in the charging gun base, obtain the second peak and valley period of electricity price corresponding to the second current time and the second stored power of the whole package of echelon battery energy storage and charging system, according to the second peak and valley period of electricity price and The second storage power is to determine the standby working mode of the entire package of echelon battery energy storage and charging system;

When the standby working mode is the charging mode of the grid to the battery pack, the grid is connected to the corresponding battery pack through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper;

When the standby working mode is the grid-to-vehicle charging preparation mode, the grid is connected to the second fast-charging DC bus through a bidirectional AC-DC converter, an energy-storage DC bus, and a DC chopper;

When the standby working mode is the charging mode of the battery pack to the grid, the battery pack is connected to the grid through the DC chopper, the energy storage DC bus and the bidirectional AC-DC converter;

When the standby working mode is the battery pack charging preparation mode for the vehicle, the battery pack is connected to the first fast-charging DC bus through a DC chopper.

Specifically, in the above-mentioned control method, according to the second peak-valley period of electricity price and the second stored electric quantity, the steps of determining the standby working mode of the whole-package echelon battery energy storage and charging system include:

When the second electricity price peak-valley period is the valley period, and the second stored power is less than the full power, determining that the standby working mode is the grid-to-battery charging mode;

When the second electricity price peak and valley period is the valley period, and the second stored power is equal to the full power, determining that the standby working mode is the grid-to-vehicle charging preparation mode;

When the second electricity price peak and valley period is a non-valley period, and the second stored power is less than the preset power threshold, determining that the standby working mode is the grid-to-vehicle charging preparation mode;

When the second electricity price peak-valley period is the pre-peak period in the non-valley period, and the second stored power is greater than the preset power threshold, it is determined that the standby working mode is the battery pack charging preparation mode, wherein the pre-peak period is the second The current time is in the peak time period or the normal time period, and the time span from the switching time point of switching to the valley time period is greater than the time period of the preset time;

When the second electricity price peak and valley period is the post-peak period in the non-valley period, and the second stored power is greater than the preset power threshold, it is determined that the standby working mode is the battery pack charging mode, wherein the post-peak period is the second current The time is in the peak period or the normal period, and the time span from the switching time point is less than or equal to the preset time period.

Another preferred embodiment of the present invention also provides a control device, comprising:

The first processing module is configured to acquire the first electricity price peak-valley period corresponding to the first current time and the first stored power of the entire package of echelon battery energy storage and charging system when detecting that the fast charging gun is pulled out of the charging gun base, And according to the first peak and valley period of electricity price and the first stored power, determine the vehicle charging mode in which the whole package of cascade battery energy storage charging system charges the vehicle;

The second processing module is configured to receive the charging request information sent by the vehicle when it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, and obtain the charging demand power of the vehicle according to the charging request information;

a third processing module, configured to determine at least one target DC chopper from the plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power;

The fourth processing module is used to control the first end of the target DC chopper to be connected to the fast charging gun through the first fast charging DC bus when the vehicle charging mode is the energy storage to vehicle charging mode, and the second end to be connected to the target DC chopper The target battery pack corresponding to the chopper is connected; or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end is connected to the fast charging gun. The grid is connected through a bidirectional AC-DC converter and the energy storage DC bus.

Preferably, in the above-mentioned control device, the first processing module includes:

The first processing unit, when the first electricity price peak and valley period is the valley period, determine that the vehicle charging mode is the grid-to-vehicle charging mode;

The second processing unit, when the first electricity price peak and valley period is a non-valley period, if the first stored power is greater than the preset power threshold, determine that the vehicle charging mode is the energy storage to vehicle charging mode; otherwise, determine that the charging mode is the grid charging the vehicle model.

Specifically, in the above-mentioned control method, the fourth processing mode includes:

The third processing unit is configured to control the first control switch arranged between the first end of the target DC chopper and the energy storage DC bus and the first fast-charging DC bus to switch between the target DC chopper and the first fast charging DC bus. The charging DC bus is connected, and the second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast charging DC bus is controlled to switch to the target DC chopper and the target battery pack The status of the connection.

Specifically, the above-mentioned control method, the fourth processing mode also includes:

The fourth processing unit is used to control the second control switch arranged between the second end of the target DC chopper and the target battery pack and the second fast charging DC bus, and switch to the target DC chopper and the second fast charging The state of the DC bus connection, and control the first control switch between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus to switch to the target DC chopper and the bidirectional AC-DC converter The status of the connection.

Preferably, the above-mentioned control device, the control device further comprises:

The fifth processing module is used to control the third control switch arranged between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun to switch to the first fast charging DC bus when the charging mode is the energy storage to vehicle charging mode. A state of the connection between the fast charging DC bus and the fast charging gun;

Alternatively, the sixth processing module is configured to control the third control switch to switch to a state in which the second fast-charging DC bus is connected to the fast-charging gun when the charging mode is the grid-to-vehicle charging mode.

Specifically, the above-mentioned control device further includes:

The seventh processing module is configured to maintain the current vehicle charging mode when it is detected that the electricity price peak-to-valley period is switched during the charging process of the vehicle.

Preferably, the above-mentioned control device further comprises:

The eighth processing module is used to switch from the current vehicle charging mode to the previous standby working mode when receiving the end charging information sent by the vehicle, and the standby working mode is the working mode when the fast charging gun is located in the charging gun base.

Further, the above-mentioned control device also includes:

The ninth processing module is configured to control the third control switch to switch to an unconnected state when receiving the charging end information sent by the vehicle.

Preferably, the above-mentioned control device further comprises:

The tenth processing module is used to obtain the second peak and valley period of electricity price corresponding to the second current time and the second stored power of the whole package of echelon battery energy storage and charging system when it is detected that the fast charging gun is located in the charging gun base, according to the The second peak and valley period of electricity price and the second stored power determine the standby working mode of the whole package of cascade battery energy storage and charging system;

The eleventh processing module is used for connecting the power grid to the corresponding battery pack through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper when the standby working mode is the grid-charging mode for the battery pack;

The twelfth processing module is used for connecting the power grid to the second fast charging DC bus through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper when the standby working mode is the grid-charging preparation mode for the vehicle;

The thirteenth processing module is used to connect the battery pack to the power grid through the DC chopper, the energy storage DC bus and the bidirectional AC-DC converter when the standby working mode is the charging mode of the battery pack to the grid;

The fourteenth processing module is configured to connect the battery pack to the first fast-charging DC bus through a DC chopper when the standby working mode is the battery pack charging preparation mode for the vehicle.

Specifically, in the above-mentioned control device, the tenth processing module includes:

a fifth processing unit, configured to determine that the standby working mode is the power grid charging battery pack mode when the second electricity price peak-valley period is a valley period and the second stored power is less than the full power;

a sixth processing unit, configured to determine that the standby working mode is the grid charging preparation mode for the vehicle when the second electricity price peak and valley period is a valley period and the second stored power is equal to the full power;

A seventh processing unit, configured to determine that the standby working mode is the grid-to-vehicle charging preparation mode when the second electricity price peak-valley period is a non-valley period and the second stored power is less than a preset power threshold;

an eighth processing unit, configured to determine that the standby working mode is the battery pack charging preparation mode for the vehicle when the second electricity price peak-valley period is the pre-peak period in the non-valley period and the second stored power is greater than the preset power threshold, wherein , the pre-peak period is the period in which the second current time is in the peak period or the normal period, and the time span from the switching time point of switching to the valley period is greater than the preset time;

A ninth processing unit, configured to determine that the standby working mode is a battery pack charging mode to the grid when the second electricity price peak-valley period is a post-peak period in a non-valley period and the second stored power is greater than a preset power threshold, wherein, The post-peak period is a period in which the second current time is in the peak period or the normal period, and the time span from the switching time point is less than or equal to the preset time.

Another preferred embodiment of the present invention also provides an energy storage and charging system for a whole package of echelon batteries, including:

Bidirectional AC-DC converter, DC chopper, battery pack, first control switch, second control switch, fast charging gun, first fast charging DC bus, second fast charging DC bus, energy storage DC bus and as described above control device;

One end of the bidirectional AC-DC converter is connected to the power grid, and the other end is connected to the first connection contacts of the plurality of first control switches through the energy storage DC bus;

The second connection contact of each first control switch is connected to the fast charging gun through the first fast charging DC bus, and the first common contact of each first control switch is connected to the first end of a DC chopper ;

The second end of each DC chopper is connected to the second common contact of a second control switch;

The third connection contact of each second control switch is connected to a battery pack, and the fourth connection contact of each second control switch is connected to the fast charging gun through the second fast charging DC bus;

The control device is respectively connected with the bidirectional AC-DC converter, the DC chopper, the battery pack, the first control switch, the second control switch and the fast charging gun, and the control device can realize the whole package of ladder batteries as described above when in use. A control method for an energy storage charging system.

Preferably, the above-mentioned whole-package echelon battery energy storage and charging system further includes:

The third control switch communicated with the control device, the third common contact of the third control switch is connected with the fast charging gun, the fifth connecting contact is connected with the first fast charging DC bus, and the sixth connecting contact is connected with the second fast charging gun Charge DC bus connection.

Compared with the prior art, the control method, device and system for a whole-package echelon battery energy storage charging system provided by the embodiment of the present invention have at least the following beneficial effects:

The technical solution provided by the present invention adds a charging pile function to the energy storage charging system of the whole package of cascade batteries, and by setting a fast-charging DC bus at each end of the DC chopper, when it is necessary to use the energy storage charging of the whole package of cascade batteries When the charging pile function of the system is used, the vehicle charging mode is determined according to the peak and valley period of the electricity price and the stored power of the whole package of echelon battery energy storage charging system, and the target DC chopper and/or target meeting the charging demand is determined according to the charging demand of the vehicle. The battery pack makes it possible to charge the vehicle without affecting other battery packs by only changing the structure connected at both ends of the target DC chopper when charging according to the vehicle charging mode. In the vehicle charging mode, the low-cost electricity in the target battery pack can be charged into the vehicle only through the target DC chopper, which is beneficial to improve the charging efficiency and reduce the charging cost.

Description of drawings

Fig. 1 is one of the schematic flow charts of the control method of the whole-package echelon battery energy storage charging system of the present invention;

Fig. 2 is the second schematic flow chart of the control method of the whole-package echelon battery energy storage charging system of the present invention;

FIG. 3 is a schematic structural diagram of a control device of the whole-package echelon battery energy storage and charging system of the present invention;

FIG. 4 is one of the schematic diagrams of the circuit structure of the whole-package echelon battery energy storage charging system of the present invention when it is in the energy storage to vehicle charging mode;

FIG. 5 is the second schematic diagram of the circuit structure when the whole-package echelon battery energy storage charging system of the present invention is in the energy storage to vehicle charging mode;

FIG. 6 is a schematic diagram of the circuit structure of the whole-pack echelon battery energy storage charging system of the present invention when the battery pack is charging to the power grid;

FIG. 7 is a schematic diagram of the circuit structure of the whole-pack echelon battery energy storage charging system of the present invention when the grid is in the battery pack charging mode;

FIG. 8 is one of the schematic diagrams of the circuit structure of the whole-package echelon battery energy storage charging system of the present invention when it is in the grid-to-vehicle charging mode;

FIG. 9 is the second schematic diagram of the circuit structure when the whole-package echelon battery energy storage charging system of the present invention is in the grid-to-vehicle charging mode.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to assist in a comprehensive understanding of embodiments of the present invention. Accordingly, it should be apparent to those skilled in the art that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily 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 size of the sequence numbers of the following processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, rather than the implementation of the present invention The implementation of the examples constitutes no limitation.

It should be understood that the term "and/or" in this document is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

In the embodiments provided in this application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is only determined according to A, and B may also be determined according to A and/or other information.

Referring to FIG. 1, a preferred embodiment of the present invention provides a control method for a whole-package echelon battery energy storage charging system, which is applied to a control device, including:

Step S101 , when it is detected that the fast charging gun is pulled out of the charging gun base, obtain the first electricity price peak and valley period corresponding to the first current time and the first stored power of the whole package of cascade battery energy storage charging system, and according to the first electricity price peak and valley period corresponding to the first current time The peak-valley period of the electricity price and the first stored amount of electricity determine the vehicle charging mode in which the whole package of cascade battery energy storage charging system charges the vehicle;

Step S102, when it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, receive the charging request information sent by the vehicle, and obtain the charging demand power of the vehicle according to the charging request information;

Step S103, determining at least one target DC chopper from the plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power;

Step S104, when the vehicle charging mode is the energy storage to vehicle charging mode, the first end of the control target DC chopper is connected to the fast charging gun through the first fast charging DC bus, and the second end is connected to the target DC chopper corresponding to the charging gun. The target battery pack is connected; or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end is connected to the grid through two-way AC. The DC converter is connected to the energy storage DC bus.

In a preferred embodiment of the present invention, it is described by taking the charging pile added to the whole package of cascade battery energy storage and charging system as a DC charging pile as an example. When the charging pile function is added, the control device will detect the fast charging gun and the whole package of ladders. The connection status of the charging gun base on the battery energy storage charging system, when it is detected that the fast charging gun is pulled out of the charging gun base, it can be determined that the whole package of the battery energy storage charging system needs to be used for new energy vehicles, including new energy vehicles. to charge external devices. In this embodiment, the external device is a new energy vehicle as an example. At this time, the first electricity price peak and valley period corresponding to the first current time, and the entire package of the echelon battery energy storage charging system at the first current time will be obtained. The first stored energy; according to the first peak and valley period of electricity price and the first stored energy, the vehicle charging mode in which the whole package of echelon battery energy storage and charging system is charged to the vehicle at the first current time can be determined under the preset judgment logic , it is convenient to select the optimal vehicle charging mode to charge the vehicle under the premise of ensuring charging, which is beneficial to save the charging cost; at the same time or after the vehicle charging mode is determined, the connection between the fast charging gun and the vehicle will also be detected and judged. Status, when it is determined that the fast charging gun is fully connected to the vehicle, it will receive the charging request information sent by the vehicle. According to the requested voltage and/or requested current parameters in the charging request information, the charging demand power of the vehicle can be obtained to understand the charging of the vehicle. need. According to the charging demand power of the vehicle and the output power of each DC chopper, if the total output power of at least one DC chopper is equal to or greater than the charging demand power, the target DC chopper during charging can be determined to ensure that the The vehicle is charging smoothly. Preferably, the present invention also judges the power of the target battery pack corresponding to each target DC chopper. If the vehicle charging mode is the energy storage to vehicle charging mode, the sum of the power of each target battery pack must be at least greater than one pre-set power.

When the determined vehicle charging mode is the energy storage to vehicle charging mode, that is, when charging the vehicle from the battery pack, the target battery pack corresponding to the target DC chopper needs to be connected to the fast charging gun. For details, please refer to Figure 4 or As shown in Figure 5, the first end of the target DC chopper is connected to the fast charging gun through the first fast charging DC bus, and the second end is connected to the corresponding target battery pack. At this time, the first end of the target DC chopper is the output The second terminal is the input terminal, which directly converts the electric energy in the target battery pack through DC to DC to charge the vehicle, which is beneficial to improve the charging efficiency and will not affect other battery packs. At the same time, the electric energy in the target battery pack It is charged in the valley period when the electricity price is low, so the use of energy storage to charge the vehicle is beneficial to reduce the charging cost.

When it is determined that the vehicle charging mode is the grid-to-vehicle charging mode, that is, the grid is directly charging, the grid needs to be connected to the fast charging gun. For details, please refer to Figure 8 or Figure 9. The energy storage DC bus and the bidirectional AC-DC converter are connected to the power grid, and the second terminal is connected to the fast charging gun through the second fast charging DC bus. At this time, the first terminal of the target DC chopper is the input terminal, and the second terminal is At the output end, the AC from the power grid is converted from AC to DC and DC to DC through the bidirectional AC-DC converter and the target DC chopper to charge the vehicle. During this process, the connection status of other DC choppers will not be changed. That is, it will not affect other battery packs.

To sum up, the technical solution provided by the present invention increases the charging pile function for the whole package of cascade battery energy storage charging system, and by setting a fast charging DC bus at each end of the DC chopper, when the whole package needs to be used When the charging pile function of the cascade battery energy storage charging system is used, the vehicle charging mode is determined according to the peak and valley period of the electricity price and the stored power of the whole package cascade battery energy storage charging system, and the target DC chopper to meet the charging demand is determined according to the charging demand of the vehicle. and/or the target battery pack, so that when charging according to the vehicle charging mode, only the structure connected at both ends of the target DC chopper needs to be changed, and the vehicle can be charged without affecting other battery packs. And in the mode of charging the vehicle from the energy storage, the low-cost electricity in the target battery pack can be charged into the vehicle only through the target DC chopper, which is beneficial to improve the charging efficiency and reduce the charging cost.

It should be noted that the energy storage DC bus is the power supply wiring harness for other electrical devices in the whole package echelon battery energy storage charging system. Therefore, when the energy storage is used to charge the vehicle, it is necessary to control a non-target DC chopper to transfer the energy storage DC. The bus bar is connected to the corresponding battery pack.

Preferably, in the above-mentioned control method, the step of determining the vehicle charging mode for charging the vehicle by the whole-package echelon battery energy storage charging system according to the first electricity price peak-valley period and the first stored electric quantity includes:

When the first electricity price peak and valley period is the valley period, determining that the vehicle charging mode is the grid-to-vehicle charging mode;

When the first electricity price peak-valley period is a non-valley period, if the first stored power is greater than the preset power threshold, it is determined that the vehicle charging mode is the energy storage to vehicle charging mode; otherwise, the charging mode is determined to be the grid-to-vehicle charging mode.

In a specific embodiment of the present invention, since the peak-valley period of the electricity price is a specific time period, when determining the electricity price peak-valley period, the current time point can be compared with the pre-stored electricity price peak-valley period comparison table to determine the first electricity price peak-valley period. A first electricity price peak-valley period corresponding to the current time. When the first electricity price peak and valley period is the valley period, the electricity price is low at this time, and the use of the grid-to-vehicle charging mode can ensure low-cost charging and simplify the process of charging the battery pack from the grid and recharging the battery pack to the vehicle. When the peak and valley period of the first electricity price is a non-valley period, that is, a peak period or a normal period, due to the higher electricity price, directly using the grid for charging will lead to higher charging costs. At this time, the first stored power is judged again. If the power is greater than the preset power threshold, it means that the entire package of echelon battery energy storage and charging system can meet the charging needs of the vehicle. At this time, the vehicle charging mode is determined to be the energy storage charging mode, and the low-cost electricity stored in the battery pack can be used to charge the vehicle. It is beneficial to save the charging cost on the premise of ensuring the charging of the vehicle; if the first stored power is less than or equal to the preset power threshold, it means that the current whole-package echelon battery energy storage charging system cannot meet or can just meet the charging needs of the vehicle. In order to avoid the situation that the vehicle cannot be charged normally due to insufficient power during the vehicle charging process, it is determined that the vehicle charging mode is the grid-to-vehicle charging mode to ensure the normal charging of the vehicle.

Optionally, the preset power threshold can be set by a technician according to the actual situation. In the present invention, the preset power threshold is preferably the full power of at least one standard new energy vehicle.

Specifically, in the above-mentioned control method, the steps of controlling the first end of the target DC chopper to be connected to the fast charging gun through the first fast charging DC bus, and the second end being connected to the target battery pack include:

controlling the first control switch disposed between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus to switch to a state where the target DC chopper is connected to the first fast charging DC bus, The second control switch disposed between the second end of the target DC chopper, the target battery pack and the second fast-charging DC bus is controlled to switch to a state where the target DC chopper is connected to the target battery pack.

Specifically, in the above control method, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end is connected to the power grid through the energy storage DC bus and the bidirectional AC-DC converter The steps include:

controlling the second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast-charging DC bus to switch to a state where the target DC chopper is connected to the second fast-charging DC bus, and The first control switch between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus is controlled to switch to a state where the target DC chopper is connected to the bidirectional AC-DC converter.

In a preferred embodiment of the present invention, a first control switch is provided between the first end of the DC chopper and the energy storage DC bus and the first fast-charging DC bus, and the second end of the DC chopper is connected to the DC bus. A second control switch is arranged between the battery pack and the second fast-charging DC bus, and the connection relationship between the DC chopper, the bidirectional AC-DC converter and the first fast-charging DC bus can be switched by controlling the first control switch. Two control switches can switch the connection relationship between the second end of the DC chopper, the target battery pack and the second fast-charging DC bus. Specifically, when the vehicle charging mode is the energy storage to vehicle charging mode, the first control switch is controlled to switch to the target DC chopper and the first end is connected to the first fast charging DC bus, and the second control switch is controlled to switch to the target DC The second end of the chopper is connected to the corresponding target battery pack, so that the target battery pack can supply power to the fast charging gun through the target DC chopper, and then charge the vehicle. When the vehicle charging mode is the grid-to-vehicle charging mode, the first control switch is controlled to switch to the first end of the target DC chopper to be connected to the energy storage DC bus, and the second control switch is controlled to switch to the second end of the target DC chopper The terminal is connected to the second fast charging DC bus, so that the electric energy of the grid can supply power to the fast charging gun through the energy storage DC bus, the bidirectional AC-DC converter and the target DC chopper, and then charge the vehicle. The vehicle charging mode can be switched easily through the control switches arranged at both ends of the DC chopper, which is beneficial to improve the charging efficiency.

Preferably, in the above-mentioned control method, after the step of determining the vehicle charging mode for charging the vehicle by the entire package of echelon battery energy storage charging system according to the first electricity price peak-valley period and the first stored electric quantity, the control method further includes:

When the charging mode is the energy storage to vehicle charging mode, control the third control switch arranged between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun to switch between the first fast charging DC bus and the fast charging gun. The status of the charging gun connection;

Alternatively, when the charging mode is the grid-to-vehicle charging mode, the third control switch is controlled to switch to a state in which the second fast-charging DC bus is connected to the fast-charging gun.

In a preferred embodiment of the present invention, a third control switch is further provided between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun. When the vehicle charging mode is the energy storage to vehicle charging mode, the By controlling the third control switch, the first fast-charging DC bus is connected to the fast-charging gun; when the vehicle charging mode is the grid-to-vehicle charging mode, the second fast-charging DC bus can be connected to the fast charging gun by controlling the third control switch connect. It is convenient to realize the connection and disconnection of the first fast charging DC bus and the second fast charging DC bus and the fast charging gun, and at the same time, it is beneficial to avoid the problem that at least one of the first control switch and the second control switch cannot be disconnected. When the battery is connected, the electric energy can be conducted to the fast charging gun through the first fast charging DC bus or the second fast charging DC bus, resulting in the connection of the battery pack or the power grid to the charging gun without the need to connect the fast charging gun, and the resulting Security Risk.

Specifically, the above control method further includes: during the charging process of the vehicle, when it is detected that the electricity price peak-to-valley period is switched, maintaining the current vehicle charging mode.

In a specific embodiment of the present invention, when a switch between the peak and valley periods of the electricity price is detected during the charging process, the current vehicle charging mode will be maintained, which is beneficial to ensure the normal charging of the vehicle and avoid disconnecting the charging and restarting during the charging process. The impact of charging on the vehicle and the entire package of echelon battery energy storage charging systems.

Preferably, the above control method further includes:

When receiving the end charging information sent by the vehicle, the current vehicle charging mode is switched to the previous standby working mode, and the standby working mode is the working mode when the fast charging gun is located in the charging gun base.

In a specific embodiment of the present invention, when receiving the end of charging information sent by the vehicle, the mode of the entire package of echelon battery energy storage charging system is switched from the current vehicle charging mode to the previous standby working mode, so that the fast charging gun Power off to avoid the safety risk caused by the charging of the fast charging gun during the process of returning the fast charging gun from the vehicle to the charging gun base. Optionally, those skilled in the art may also only disconnect the connection between the target DC chopper and the first fast-charging DC bus and the second fast-charging DC bus.

Further, the above-mentioned control method further includes: when receiving the charging end information sent by the vehicle, controlling the third control switch to switch to a disconnected state.

In a specific embodiment of the present invention, when the end charging information sent by the vehicle is received, the third control switch is also controlled to switch to the disconnected state, so as to avoid the target DC chopper still passing through the first fast charging DC bus or The connection between the second fast-charging DC bus and the fast-charging gun leads to the charging of the fast-charging gun, and thus leads to safety risks.

Referring to Fig. 2, preferably, the above control method further includes:

Step S201, when it is detected that the fast charging gun is located in the charging gun base, obtain the second electricity price peak and valley period corresponding to the second current time and the second stored electricity of the whole package of the battery energy storage and charging system, according to the second electricity price peak The valley period and the second stored power are determined to determine the standby working mode of the entire package of echelon battery energy storage and charging system;

Step S202, when the standby working mode is the grid charging mode to the battery pack, the grid is connected to the corresponding battery pack through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper; or,

When the standby working mode is the grid-to-vehicle charging preparation mode, the grid is connected to the second fast-charging DC bus through a bidirectional AC-DC converter, an energy-storage DC bus, and a DC chopper; or,

When the standby working mode is the charging mode of the battery pack to the grid, the battery pack is connected to the grid through the DC chopper, the energy storage DC bus and the bidirectional AC-DC converter; or,

When the standby working mode is the battery pack charging preparation mode for the vehicle, the battery pack is connected to the first fast-charging DC bus through a DC chopper.

In a specific embodiment of the present invention, when the fast charging gun is located in the charging gun base, the second peak and valley period of electricity price corresponding to the second current time and the second stored power of the whole package of echelon battery energy storage and charging system will be obtained. , according to the second peak and valley period of electricity price and the second stored power, the standby working mode of the whole package of echelon battery energy storage and charging system can be determined under the preset judgment logic, that is, the whole package of echelon batteries is not used for external charging. The working mode of the energy storage and charging system ensures the realization of the original functions of the whole package of echelon battery energy storage and charging system.

Specifically, when the standby working mode is the grid-to-battery charging mode, the grid needs to be connected to the battery pack. The circuit diagram of the whole-pack echelon battery energy storage charging system can be found in Figure 7. At this time, the power of the grid passes through the bidirectional AC and DC Converter, energy storage DC bus, DC chopper, connected to the battery pack; when it is detected that the fast charging gun is pulled out of the charging gun base in the grid charging mode to the battery pack, the vehicle charging mode is the grid charging the vehicle. In the charging mode, please refer to Figure 8 for the circuit schematic diagram of the whole-pack echelon battery energy storage charging system, which can simultaneously charge the vehicle and the battery pack.

When the standby working mode is the grid-to-vehicle charging preparation mode, the grid is connected to the second fast-charging DC bus through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper, but the DC chopper and the bidirectional AC-DC converter are connected to the second fast-charging DC bus. Do not work, to avoid the charging of the fast charging gun; when it is detected that the fast charging gun is pulled out of the charging gun base in the grid-to-vehicle charging preparation mode, the vehicle charging mode is the grid-to-vehicle charging mode, and the whole package of echelon batteries The circuit schematic diagram of the energy storage charging system can be found in Fig. 9, and only the vehicle can be charged. When the standby working mode is the charging mode of the battery pack to the grid, the battery pack is connected to the grid through the DC chopper, the energy storage DC bus and the bidirectional AC-DC converter, and the electric energy in the battery pack is sent to the grid, and the whole pack of cascade batteries is stored in the grid. The circuit schematic diagram of the charging system can be found in FIG. 6 for details. In the grid-to-vehicle charging preparation mode, when it is detected that the fast charging gun is pulled out of the charging gun base, the vehicle charging mode is the battery pack-to-vehicle charging mode. Referring to Figure 4, the battery pack can be discharged to the vehicle and the grid at the same time.

When the standby working mode is the battery pack ready to charge the vehicle, the battery pack is connected to the first fast charging DC bus through a DC chopper, but the DC chopper and bidirectional AC-DC converter do not work to prevent the fast charging gun from being charged; In the battery pack to vehicle charging preparation mode, when it is detected that the fast charging gun is pulled out of the charging gun base, the vehicle charging mode is the battery pack charging mode, and the circuit diagram of the whole pack ladder battery energy storage charging system For details, please refer to FIG. 5 to realize only charging the vehicle.

Specifically, in the above-mentioned control method, according to the second peak-valley period of electricity price and the second stored electric quantity, the steps of determining the standby working mode of the whole-package echelon battery energy storage and charging system include:

When the second electricity price peak-valley period is the valley period, and the second stored power is less than the full power, determining that the standby working mode is the grid-to-battery charging mode;

When the second electricity price peak and valley period is the valley period, and the second stored power is equal to the full power, determining that the standby working mode is the grid-to-vehicle charging preparation mode;

When the second electricity price peak-valley period is a non-valley period, and the second stored power is less than the preset threshold, determining that the standby working mode is the grid-to-vehicle charging preparation mode;

When the second electricity price peak-valley period is the pre-peak period in the non-valley period, and the second stored power is greater than the preset power threshold, it is determined that the standby working mode is the battery pack charging preparation mode, wherein the pre-peak period is the second The current time is in the peak time period or the normal time period, and the time span from the switching time point of switching to the valley time period is greater than the time period of the preset time;

When the second electricity price peak and valley period is the post-peak period in the non-valley period, and the second stored power is greater than the preset power threshold, it is determined that the standby working mode is the battery pack charging mode, wherein the post-peak period is the second current The time is in the peak period or the normal period, and the time span from the switching time point is less than or equal to the preset time period.

In a specific embodiment of the present invention, the second electricity price peak-valley period and the second stored amount of electricity are judged when determining the standby working mode of the whole-package echelon battery energy storage and charging system.

If the peak-valley period of the second electricity price is the valley period, and the second storage power is less than the full power, it can be determined that the whole package of cascade battery energy storage charging system needs to be charged. Pack charging mode, which enables the grid to charge the battery pack. If the peak-valley period of the second electricity price is the valley period, and the second storage power is equal to the full power, it can be determined that the whole package of the cascade battery energy storage system does not need to be charged. The low-cost charging of external equipment, the standby working mode is determined as the grid-to-vehicle charging preparation mode, and preparations are made in advance. When external equipment needs to be charged, the corresponding DC chopper and bidirectional AC-DC converter can be directly controlled to work. , to ensure fast charging of external devices.

If the peak-valley period of the second electricity price is a non-valley period, and the second stored power is less than the preset threshold, the price of electricity is high and the whole package of echelon battery energy storage and charging system does not have enough power to charge external devices. When charging external devices, it must obtain power from the power grid, so the standby mode is determined as the grid-to-vehicle charging preparation mode, which can ensure fast charging of external devices;

If the second electricity price peak-valley period is the pre-peak period in the non-valley period, and the second stored electricity is greater than the preset electricity threshold, the electricity price is high and the whole package of echelon battery energy storage and charging system has enough electricity to charge external devices , due to the large time span from the switching time point of switching to the valley period, the standby working mode is determined as the battery pack charging preparation mode for the vehicle at this time. While ensuring fast charging of external devices, the low-cost electricity in the battery pack Charging is conducive to reducing charging costs;

If the second electricity price peak-valley period is the post-peak period in the non-valley period, and the second stored power is greater than the preset power threshold, the price of electricity is high at this time and the whole package of echelon battery energy storage and charging system has enough power for external equipment For charging, due to the switching time of the valley period, the standby working mode is determined to be the battery pack charging mode at this time, and the excess energy in the whole pack cascade battery energy storage charging system can be sent to the grid, which will sell low-price electricity at a high price , which is conducive to obtaining higher returns.

It should be noted that the above switching time point is the time point when switching from the peak period or the normal period of the electricity price to the valley period; the pre-peak period is the time span from the switching time point in the peak period or the normal period is greater than a preset time. Period, the post-peak period is the period in which the time span from the switching time point in the peak period or the normal period is less than or equal to a preset time, wherein the preset time can be set by technicians according to the parameters of the whole package of echelon battery energy storage and charging system , for example, set to one hour.

Referring to FIG. 3, another preferred embodiment of the present invention further provides a control device, including:

The first processing module 301 is configured to acquire the first electricity price peak-valley period corresponding to the first current time and the first stored power of the entire package of cascade battery energy storage and charging system when detecting that the fast charging gun is pulled out of the charging gun base , and according to the first peak and valley period of the electricity price and the first stored power, determine the vehicle charging mode in which the whole package of echelon battery energy storage charging system charges the vehicle;

The second processing module 302 is configured to receive the charging request information sent by the vehicle when it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, and obtain the charging demand power of the vehicle according to the charging request information;

The third processing module 303 is configured to determine at least one target DC chopper from the plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power;

The fourth processing module 304 is configured to control the first end of the target DC chopper to be connected to the fast charging gun through the first fast charging DC bus when the vehicle charging mode is the energy storage to vehicle charging mode, and the second end to be connected to the target DC The target battery pack corresponding to the chopper is connected; or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second end of the control target DC chopper is connected to the fast charging gun through the second fast charging DC bus, and the first end It is connected to the power grid through a bidirectional AC-DC converter and an energy-storage DC bus.

Preferably, in the above-mentioned control device, the first processing module includes:

The first processing unit, when the first electricity price peak and valley period is the valley period, determine that the vehicle charging mode is the grid-to-vehicle charging mode;

The second processing unit, when the first electricity price peak and valley period is a non-valley period, if the first stored power is greater than the preset power threshold, determine that the vehicle charging mode is the energy storage to vehicle charging mode; otherwise, determine that the charging mode is the grid charging the vehicle model.

Specifically, in the above-mentioned control method, the fourth processing mode includes:

The third processing unit is configured to control the first control switch arranged between the first end of the target DC chopper and the energy storage DC bus and the first fast-charging DC bus to switch between the target DC chopper and the first fast charging DC bus. The charging DC bus is connected, and the second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast charging DC bus is controlled to switch to the target DC chopper and the target battery pack The status of the connection.

Specifically, the above-mentioned control method, the fourth processing mode also includes:

The fourth processing unit is used to control the second control switch arranged between the second end of the target DC chopper and the target battery pack and the second fast charging DC bus, and switch to the target DC chopper and the second fast charging The state of the DC bus connection, and control the first control switch between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus to switch to the target DC chopper and the bidirectional AC-DC converter The status of the connection.

Preferably, the above-mentioned control device, the control device further comprises:

The fifth processing module is used to control the third control switch arranged between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun to switch to the first fast charging DC bus when the charging mode is the energy storage to vehicle charging mode. A state of the connection between the fast charging DC bus and the fast charging gun;

Alternatively, the sixth processing module is configured to control the third control switch to switch to a state in which the second fast-charging DC bus is connected to the fast-charging gun when the charging mode is the grid-to-vehicle charging mode.

Specifically, the above-mentioned control device further includes:

The seventh processing module is configured to maintain the current vehicle charging mode when it is detected that the electricity price peak-to-valley period is switched during the charging process of the vehicle.

Preferably, the above-mentioned control device further comprises:

The eighth processing module is used to switch from the current vehicle charging mode to the previous standby working mode when receiving the end charging information sent by the vehicle, and the standby working mode is the working mode when the fast charging gun is located in the charging gun base.

Further, the above-mentioned control device also includes:

The ninth processing module is configured to control the third control switch to switch to an unconnected state when receiving the charging end information sent by the vehicle.

Preferably, the above-mentioned control device further comprises:

The tenth processing module is used to obtain the second peak and valley period of electricity price corresponding to the second current time and the second stored power of the whole package of echelon battery energy storage and charging system when it is detected that the fast charging gun is located in the charging gun base, according to the The second peak and valley period of electricity price and the second stored power determine the standby working mode of the whole package of cascade battery energy storage and charging system;

The eleventh processing module is used for connecting the power grid to the corresponding battery pack through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper when the standby working mode is the grid-charging mode for the battery pack;

The twelfth processing module is used for connecting the power grid to the second fast charging DC bus through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper when the standby working mode is the grid-charging preparation mode for the vehicle;

The thirteenth processing module is used to connect the battery pack to the power grid through the DC chopper, the energy storage DC bus and the bidirectional AC-DC converter when the standby working mode is the charging mode of the battery pack to the grid;

The fourteenth processing module is configured to connect the battery pack to the first fast-charging DC bus through a DC chopper when the standby working mode is the battery pack charging preparation mode for the vehicle.

Specifically, in the above-mentioned control device, the tenth processing module includes:

a fifth processing unit, configured to determine that the standby working mode is the power grid charging battery pack mode when the second electricity price peak-valley period is a valley period and the second stored power is less than the full power;

a sixth processing unit, configured to determine that the standby working mode is the grid charging preparation mode for the vehicle when the second electricity price peak and valley period is a valley period and the second stored power is equal to the full power;

A seventh processing unit, configured to determine that the standby working mode is the grid-to-vehicle charging preparation mode when the second electricity price peak-valley period is a non-valley period and the second stored power is less than a preset power threshold;

an eighth processing unit, configured to determine that the standby working mode is the battery pack charging preparation mode for the vehicle when the second electricity price peak-valley period is the pre-peak period in the non-valley period and the second stored power is greater than the preset power threshold, wherein , the pre-peak period is the period in which the second current time is in the peak period or the normal period, and the time span from the switching time point of switching to the valley period is greater than the preset time;

A ninth processing unit, configured to determine that the standby working mode is a battery pack charging mode to the grid when the second electricity price peak-valley period is a post-peak period in a non-valley period and the second stored power is greater than a preset power threshold, wherein, The post-peak period is a period in which the second current time is in the peak period or the normal period, and the time span from the switching time point is less than or equal to the preset time.

The embodiment of the control device of the present invention is a control device corresponding to the embodiment of the above-mentioned control method. All the implementation means in the embodiment of the above-mentioned control method are applicable to the embodiment of the control device, and the same technical effect can also be achieved. .

Referring to FIGS. 4 to 9 , another preferred embodiment of the present invention also provides a whole-package echelon battery energy storage and charging system, including:

Bidirectional AC-DC converter, DC chopper, battery pack, first control switch, second control switch, fast charging gun, first fast charging DC bus, second fast charging DC bus, energy storage DC bus and as described above control device;

One end of the bidirectional AC-DC converter is connected to the power grid, and the other end is connected to the first connection contacts of the plurality of first control switches through the energy storage DC bus;

The second connection contact of each first control switch is connected to the fast charging gun through the first fast charging DC bus, and the first common contact of each first control switch is connected to the first end of a DC chopper ;

The second end of each DC chopper is connected to the second common contact of a second control switch;

The third connection contact of each second control switch is connected to a battery pack, and the fourth connection contact of each second control switch is connected to the fast charging gun through the second fast charging DC bus;

The control device is respectively connected with the bidirectional AC-DC converter, the DC chopper, the battery pack, the first control switch, the second control switch and the fast charging gun, and the control device can realize the whole package of ladder batteries as described above when in use. A control method for an energy storage charging system.

Referring to FIGS. 4 to 9, in a preferred embodiment of the present invention, the whole package of the battery energy storage and charging system includes: a bidirectional AC-DC converter 1, a DC chopper 2, a battery pack 3, a first control switch 4, a first control switch 4, a two control switches 5, a fast charging gun 6, a first fast charging DC bus 7, a second fast charging DC bus 8, an energy storage DC bus 10, and the above-mentioned control device 9;

The power grid is connected to the battery pack 3 through the bidirectional AC-DC converter 1 , the energy storage DC bus 11 , the first control switch 4 , the DC chopper 2 and the second control switch 5 to form a first charging circuit. The electric energy of the grid can be charged into the battery pack 3, and the electric energy in the battery pack 3 can also be fed back to the grid;

The first fast charging DC bus 7 for connecting with the fast charging gun 6 is connected with the second connection contact of each first control switch 4, when the first common contact of the first control switch 4 is connected with the second contact , and when the second common contact of the second control switch 5 is connected to the third connection contact, the battery pack 3 , the second control switch 5 , the DC chopper 2 , the first control switch 4 , and the first fast-charging DC bus 7 and the fast charging gun 6 constitute a second charging circuit, so that the electric energy in the battery pack 3 can be charged into the vehicle through the second charging circuit, and the charging pile function is added to the whole-pack echelon battery energy storage charging system;

The second fast charging DC bus 8 for connecting with the fast charging gun 6 is connected with the fourth connection contact of each second control switch 5, when the second common contact of the second control switch 5 is connected with the fourth contact , and when the first common contact of the first control switch 4 is connected to the first connection contact, the power grid, the bidirectional AC/DC converter 1, the energy storage DC bus 11, the first control switch 4, the DC chopper 2, the The second control switch 5, the second fast-charging DC bus 8 and the fast-charging gun 6 constitute a third charging circuit, so that the electric energy in the power grid can be charged into the vehicle through the third charging circuit, which increases the energy storage and charging system for the whole package of echelon batteries. Charging pile function;

The control device 9 is respectively connected to the bidirectional AC/DC converter 1, the DC chopper 2, the battery pack 3, the first control switch 4, the second control switch 5, and the fast charging gun 6, so that the control device 9 can communicate with the bidirectional AC/DC. The converter 1 , the DC chopper 2 , the battery pack 3 , the first control switch 4 , the second control switch 5 and the fast charging gun 6 are controlled to implement the above control method.

To sum up, the technical solution provided by the present invention adds a charging pile function to the whole package of cascade battery energy storage and charging system, and by setting a fast charging DC bus at each end of the DC chopper 2, when it is necessary to use the whole battery. When including the charging pile function of the echelon battery energy storage charging system, according to the charging demand of the vehicle, determine the target battery pack and the target DC chopper 2 that meet the charging demand, and determine the charging mode according to the peak and valley period of the electricity price, so that the charging mode is carried out according to the charging mode. When charging, it is only necessary to change the structure connected at both ends of the target DC chopper 2, so that the vehicle can be charged without affecting the normal charging and discharging of other battery packs 3, and in the energy storage charging mode, only The low-cost electricity in the target battery pack can be charged into the vehicle through the target DC chopper 2, which is beneficial to improve the charging efficiency and reduce the charging cost.

Referring to FIGS. 4 to 9 , preferably, the above-mentioned whole-package echelon battery energy storage charging system further includes:

The third control switch communicated with the control device, the third common contact of the third control switch is connected with the fast charging gun, the fifth connecting contact is connected with the first fast charging DC bus, and the sixth connecting contact is connected with the second fast charging gun Charge DC bus connection.

In a specific embodiment of the present invention, a third control switch 10 is further arranged between the first fast charging DC bus 7 , the second fast charging DC bus 8 and the fast charging gun 6 . When the vehicle charging mode is energy storage to the vehicle In the charging mode, the first fast charging DC bus 7 can be connected to the fast charging gun 6 by controlling the third control switch 10; when the vehicle charging mode is the grid-to-vehicle charging mode, the third control switch 10 can be controlled to enable the second fast charging DC bus 7 to be connected to the fast charging gun 6. The fast charging DC bus 8 is connected to the fast charging gun 6 . The connection between the first fast charging DC bus 7 and the second fast charging DC bus 8 and the fast charging gun 6 is realized, and at the same time, it is beneficial to avoid the problem that at least one of the first control switch 4 and the second control switch 5 cannot be disconnected. , so that the electric energy can be conducted to the fast charging gun 6 through the first fast charging DC bus 7 or the second fast charging DC bus 8, so that the battery pack 3 or the power grid is connected to the fast charging gun 6 without charging the vehicle. , and the resulting security risks.

It should be noted that the dashed arrows in FIGS. 4 to 9 are the flow directions of electric energy.

Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed.

It should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply those entities or operations There is no such actual relationship or order between them. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (13)

1. a control method of a whole package of echelon battery energy storage charging system, applied to a control device, is characterized in that, comprising: When it is detected that the fast charging gun is pulled out of the charging gun base, obtain the first electricity price peak and valley period corresponding to the first current time and the first stored electricity of the whole package of cascade battery energy storage and charging system, and according to the first electricity price The peak-valley time period and the first stored electric quantity determine the vehicle charging mode in which the whole-package echelon battery energy storage charging system charges the vehicle; When it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, receiving the charging request information sent by the vehicle, and obtaining the charging demand power of the vehicle according to the charging request information; determining at least one target DC chopper from a plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power; When the vehicle charging mode is the energy storage to vehicle charging mode, the first end of the target DC chopper is controlled to be connected to the fast charging gun through the first fast charging DC bus, and the second end is connected to the target DC The target battery pack corresponding to the chopper is connected; or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second end of the target DC chopper is controlled to be connected to the The fast charging gun is connected, and the first end is connected with the power grid through a bidirectional AC-DC converter and an energy storage DC bus. 2 . The control method according to claim 1 , wherein, according to the first peak-valley period of electricity price and the first stored power, determining the amount of time that the entire package of echelon battery energy storage and charging system charges the vehicle. 3 . The steps of the vehicle charging mode include: When the first electricity price peak-valley period is a valley period, determining that the vehicle charging mode is the grid-to-vehicle charging mode; When the first electricity price peak-valley period is a non-valley period, if the first stored power is greater than a preset power threshold, it is determined that the vehicle charging mode is the energy storage-to-vehicle charging mode; otherwise, the charging mode is determined A vehicle charging mode for the grid. 3 . The control method according to claim 1 , wherein the first end of the control target DC chopper is connected to the fast charging gun through a first fast charging DC bus, and the second end is connected to the fast charging gun. 4 . The steps for connecting the target battery pack include: Controlling the first control switch arranged between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus to switch between the target DC chopper and the DC bus. the state of the connection of the first fast-charging DC bus, and controlling a second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast-charging DC bus, Switch to a state where the target DC chopper is connected to the target battery pack. 4 . The control method according to claim 1 , wherein the second end of the control target DC chopper is connected to the fast charging gun through a second fast charging DC bus, and the first The step of connecting one end to the power grid through the energy storage DC bus and the bidirectional AC-DC converter includes: Controlling a second control switch disposed between the second end of the target DC chopper and the target battery pack and the second fast-charging DC bus to switch between the target DC chopper and the first The two fast charging DC buses are connected, and the first control switch between the first end of the target DC chopper and the energy storage DC bus and the first fast charging DC bus is controlled to switch to The state in which the target DC chopper is connected to the bidirectional AC-DC converter. 5 . The control method according to claim 1 , wherein, according to the first electricity price peak and valley period and the first stored power, it is determined that the entire package of echelon battery energy storage and charging system is charged to the vehicle. 6 . After the step of the vehicle charging mode, the control method further includes: When the charging mode is an energy storage to vehicle charging mode, control a third control switch disposed between the first fast charging DC bus, the second fast charging DC bus and the fast charging gun to switch to the The state in which the first fast-charging DC bus is connected to the fast-charging gun; Alternatively, when the charging mode is the grid-to-vehicle charging mode, the third control switch is controlled to switch to a state in which the second fast-charging DC bus is connected to the fast-charging gun. 6 . The control method according to claim 1 , further comprising: in the charging process of the vehicle, when it is detected that the electricity price peak-to-valley period is switched, maintaining the current vehicle charging mode. 7 . 7. The control method according to claim 1, further comprising: When receiving the end charging information sent by the vehicle, the current vehicle charging mode is switched to the previous standby working mode, and the standby working mode is the working mode when the fast charging gun is located in the charging gun base. 8 . The control method according to claim 5 , further comprising: controlling the third control switch to switch to an unconnected state when receiving the charging end information sent by the vehicle. 9 . 9. The control method according to claim 1, further comprising: When it is detected that the fast charging gun is located in the charging gun base, the second peak and valley period of electricity price corresponding to the second current time and the second stored power of the whole package of echelon battery energy storage and charging system are obtained. the second peak-valley period of electricity price and the second stored electric quantity, and determine the standby working mode of the whole package of cascade battery energy storage and charging system; When the standby working mode is the grid charging mode to the battery pack, the grid is connected to the corresponding battery pack through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper; When the standby working mode is the grid-to-vehicle charging preparation mode, the grid is connected to the second fast-charging DC bus through the bidirectional AC-DC converter, the energy storage DC bus, and the DC chopper ; When the standby working mode is the charging mode of the battery pack to the grid, the battery pack is connected to the grid through a DC chopper, an energy storage DC bus and a bidirectional AC-DC converter; When the standby working mode is the battery pack charging preparation mode for the vehicle, the battery pack is connected to the first fast-charging DC bus through a DC chopper. 10 . The control method according to claim 9 , wherein the standby working mode of the whole-package echelon battery energy storage and charging system is determined according to the second peak-valley period of electricity price and the second stored power. 11 . The steps include: When the second electricity price peak and valley period is a valley period, and the second stored power is less than the full power, determining that the standby working mode is a grid-charging battery pack mode; When the second electricity price peak and valley period is a valley period, and the second stored power is equal to the full power, determining that the standby working mode is the grid-to-vehicle charging preparation mode; When the second electricity price peak-valley period is a non-valley period, and the second stored power is less than a preset power threshold, determining that the standby working mode is a grid-to-vehicle charging preparation mode; When the second electricity price peak-valley period is a pre-peak period in a non-valley period, and the second stored power is greater than a preset power threshold, it is determined that the standby working mode is a battery pack charging preparation mode for the vehicle, wherein, The pre-peak period is a period in which the second current time is in a peak period or a normal period, and the time span from the switching time point of switching to the valley period is greater than a preset time; When the second electricity price peak-valley period is a post-peak period in a non-valley period, and the second stored power is greater than the preset power threshold, it is determined that the standby working mode is a battery pack charging mode, wherein , the post-peak period is a period when the second current time is in the peak period or the normal period, and the time span from the switching time point is less than or equal to the preset time. 11. A control device, characterized in that it comprises: The first processing module is configured to acquire the first electricity price peak-valley period corresponding to the first current time and the first stored power of the entire package of echelon battery energy storage and charging system when detecting that the fast charging gun is pulled out of the charging gun base, and determining a vehicle charging mode for charging the vehicle by the whole-package echelon battery energy storage charging system according to the first electricity price peak-valley period and the first stored electricity; The second processing module is configured to receive the charging request information sent by the vehicle when it is detected that the connection state between the fast charging gun and the vehicle is the connection completed state, and obtain the charging request information of the vehicle according to the charging request information. Charging demand power; a third processing module, configured to determine at least one target DC chopper from the plurality of DC choppers according to the charging demand power and the vehicle charging mode, wherein the total output power of the target DC chopper is equal to the charging demand power; The fourth processing module is configured to control the first end of the target DC chopper to be connected to the fast charging gun through the first fast charging DC bus when the vehicle charging mode is the energy storage to vehicle charging mode, and the first terminal is connected to the fast charging gun. The two terminals are connected to the target battery pack corresponding to the target DC chopper; or, when the vehicle charging mode is the grid-to-vehicle charging mode, the second terminal of the target DC chopper is controlled to pass through the second The fast-charging DC bus is connected to the fast-charging gun, and the first end is connected to the power grid through a bidirectional AC-DC converter and an energy storage DC bus. 12. An energy storage and charging system for a whole package of echelon batteries, characterized in that, comprising: Bidirectional AC-DC converter, DC chopper, battery pack, first control switch, second control switch, fast charging gun, first fast charging DC bus, second fast charging DC bus, energy storage DC bus and as claimed in the claims The control device described in 11; Wherein, one end of the bidirectional AC-DC converter is connected to the power grid, and the other end is connected to the first connection contacts of the plurality of first control switches through the energy storage DC bus; The second connection contact of each of the first control switches is connected to the fast charging gun through the first fast-charging DC bus, and the first common contact of each of the first control switches is connected to one of the DC chopper The first end of the device is connected; The second end of each of the DC choppers is connected to a second common contact of one of the second control switches; The third connection contact of each of the second control switches is connected to one of the battery packs, and the fourth connection contact of each of the second control switches is connected to the fast charge via the second fast charge DC bus. gun connection; The control device is respectively connected in communication with the bidirectional AC/DC converter, the DC chopper, the battery pack, the first control switch, the second control switch and the fast charging gun, and all When the control device is in use, the control method of the whole-package echelon battery energy storage charging system according to any one of claims 1 to 10 can be realized. 13. The whole-package echelon battery energy storage charging system according to claim 12, characterized in that, further comprising: A third control switch communicated with the control device, the third common contact of the third control switch is connected to the fast charging gun, the fifth connection contact is connected to the first fast charging DC bus, and the third common contact of the third control switch is connected to the fast charging gun. Six connection contacts are connected to the second fast-charging DC bus.

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