CN113410860A

CN113410860A - Control method of energy storage device, energy storage device and storage medium

Info

Publication number: CN113410860A
Application number: CN202110868727.1A
Authority: CN
Inventors: 黄俊星
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-09-17
Anticipated expiration: 2041-07-30
Also published as: CN113410860B

Abstract

The application discloses a control method of an energy storage device, the energy storage device and a storage medium, and relates to the technical field of electric power control. The control method comprises the following steps: acquiring sensor information of a battery as battery information; calculating the state information of the battery according to the battery information; acquiring power information of the bidirectional direct current chopper and power distribution information issued by the main controller; and controlling the energy storage device according to the state information of the battery, the power information of the bidirectional direct current chopper and the power information issued by the main controller. This application need not to disassemble battery package with the mode that whole package utilized, has low cost, safe controllable, convenient operation's characteristics. And meanwhile, the native BMS is reserved, but the algorithm protocol of the native BMS is not needed, and the native BMS only needs to provide the information detected by the sensor inside the retired battery pack, so that the control and the utilization of the battery pack can be realized. This application helps promoting the quick development of echelon utilization and energy storage industry.

Description

Control method of energy storage device, energy storage device and storage medium

Technical Field

The application relates to the technical field of electric power electronic control, in particular to a control method for utilizing an energy storage device in a gradient manner based on a whole package mode, the energy storage device and a storage medium.

Background

China has become one of the world's largest electric vehicle markets in recent years. The battery, however, has a useful life of only 4-8 years and must be replaced later. The retired power battery has 70% -80% of available capacity, so that the echelon utilization energy storage of the retired power battery becomes one of the research directions in the field.

The low-cost and high-safety echelon utilization based on the whole package mode is a future trend. However, at present, most of the whole car factories or battery factories do not want to open the communication protocol of the BMS to the third party due to the worry about the leakage of the BMS algorithm; in addition, BMS coding modes and protocols of each battery brand are not uniform, and a set of system needs to be customized for the battery brand when the battery brand is reused. The development of whole package echelon utilization has resulted in the creation of the elbows for several reasons.

Disclosure of Invention

The present application provides a method for controlling an energy storage device, and a storage medium, which are intended to solve at least one of the technical problems in the prior art.

According to a control method of an energy storage device of an embodiment of a first aspect of the present application, the energy storage device includes a local controller, a bidirectional dc chopper, and a battery pack, the battery pack is connected to a common dc bus through the bidirectional dc chopper, the local controller is respectively connected in communication with the battery pack, the bidirectional dc chopper, and a main controller, the battery pack includes a battery management system BMS and a battery, the method includes:

acquiring battery information of the battery;

calculating the state information of the battery according to the battery information;

acquiring power information of the bidirectional direct current chopper;

acquiring power distribution information issued by the main controller;

and controlling the energy storage device according to the state information of the battery, the power information of the bidirectional direct current chopper and the power information issued by the main controller.

According to the control method of the energy storage device, at least the following beneficial effects are achieved:

in the existing scheme, after the parameter information representing the retired battery pack is sent to an external controller, the battery can be conveniently controlled, but due to the concern of leakage of an algorithm of an own BMS, a whole vehicle factory or a battery factory is not willing to open a communication protocol of the BMS to a third party, so that the development difficulty of gradient utilization of the whole pack is serious. In the embodiment of the present application, the external controller (e.g., the local controller LCU of the present application) makes changes to the information requirements of the native BMS. With the mode that whole package utilized, need not to disassemble the battery package, remain native BMS simultaneously, but do not need native BMS's algorithm agreement, native BMS only need provide the data that retired battery package internal sensor detected, include: voltage, current, temperature, insulation resistance and the like, namely the control and utilization of the battery pack can be realized. Because this application need not to disassemble the battery package, consequently have low-cost, safe controllable, convenient operation's characteristics, help promoting the quick development of echelon utilization and energy storage industry.

According to some embodiments of the present application, the battery pack further comprises a sensor;

the acquiring of the battery information of the battery includes:

sending wake-up information to the BMS, wherein the wake-up information is used for waking up the BMS to read the sensor data;

acquiring sensor data read by the BMS as battery information of the battery;

the battery information includes voltage, current, temperature, insulation resistance.

According to some embodiments of the present application, the wake-up information is further used for performing voltage equalization when a voltage difference value of each electric core in the battery pack exceeds a preset threshold value.

According to some embodiments of the application, the method further comprises:

and sending handshake information to the BMS, wherein the handshake information is used for verifying the sensor data.

According to some embodiments of the application, the method further comprises:

calculating fault information and switch information of the battery according to the battery information;

acquiring fault information and state information of the bidirectional direct current chopper;

acquiring a start-stop command issued by the main controller;

and controlling the energy storage device according to the state information, the fault information and the switching information of the battery, the power information, the fault information and the state information of the bidirectional direct current chopper, and the power distribution information and the start-stop command sent by the main controller.

According to some embodiments of the present application, the state information of the battery includes state of energy SOE, state of charge SOC, state of power SOP, state of health SOH;

the fault information of the battery comprises overvoltage, overcurrent, overtemperature, short circuit, electric leakage and communication errors;

the switch information of the battery comprises the current state of the switch, switch closing permission information and a charging/discharging cutoff signal.

According to some embodiments of the application, the controlling of the energy storage device comprises:

charging/discharging the battery, controlling a battery switch, and controlling on/off of the bidirectional dc chopper.

According to some embodiments of the present application, the manner of sending the power allocation information by the master controller includes:

and the main controller receives the state information of the battery and the power information of the bidirectional direct current chopper sent by the local controller and sends power distribution information according to the state information of the battery and the power information of the bidirectional direct current chopper.

According to an embodiment of the second aspect of the present application, the energy storage device comprises a local controller, a bidirectional dc chopper and a battery pack, the battery pack is connected to a common dc bus through the bidirectional dc chopper, the local controller is respectively in communication connection with the battery pack, the bidirectional dc chopper and a main controller, the battery pack comprises a battery management system BMS and a battery, and the local controller is configured to perform the method according to the first aspect.

A computer-readable storage medium according to an embodiment of the third aspect of the present application, the computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method according to the first aspect.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present application;

fig. 2 is a schematic flow chart illustrating a method for controlling an energy storage device according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a connection between a battery pack and a local controller according to an embodiment of the present application;

FIG. 4 is a flowchart illustrating the sub-steps of step S100 according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a method for controlling an energy storage device according to another embodiment of the present disclosure.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings. With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The echelon utilization of stored energy is used as an important part for connecting new energy automobiles and new energy power generation across industries, and the healthy development of the new energy automobile and new energy power generation system can be related to whether the national energy conservation and emission reduction can be successfully completed or not. On one hand, the battery can consume more and more retired power batteries, the service life of the batteries is prolonged, and ecological impact on the environment is reduced; on the other hand, the method can smooth the power output fluctuation of the new energy power generation system, realize the capacity increase of the power grid and the like.

At present, the echelon utilization of the battery is mainly focused on disassembly, recombination and reuse, but the mode has some defects, such as high disassembly cost, liquid leakage, fire and explosion risks, poor consistency performance after recombination and the like. Therefore, the use of echelons based on a full pack approach (i.e., without disassembling the battery pack) will be a trend in the future, mainly due to several factors: 1. the cost is low: the battery pack does not need to be disassembled, and the original BMS and the mechanical shell are reserved, so that the use cost can be obviously reduced, and the return on investment period of the system can be reduced by 40% -60% compared with the mode of disassembly and reuse; 2. the safety is high: the battery pack does not need to be disassembled, so that the risks of liquid leakage, fire, pollution or explosion do not exist; 3. the consistency problem after the cell recombination is not required to be considered; 4. change of battery morphology: more and more new battery structures are coming out, such as Cell-To-pack (ctp), blade battery, etc., one of their characteristics is that the large module is integrally formed, which cannot be disassembled or the disassembly cost is very high.

Although the echelon utilization based on the whole package mode has the advantages, most of the whole car factories or battery factories do not want to open the communication protocol of the BMS to the third party due to the worry of the leakage of the BMS algorithm at home; in addition, BMS coding modes and protocols of each battery brand are not uniform, and a set of system needs to be customized for the battery brand when the battery brand is reused. The development of whole package echelon utilization has resulted in the creation of the elbows for several reasons.

Based on the above, the embodiment of the application provides a control method for using an energy storage device in a echelon based on a whole-pack mode, the energy storage device and a storage medium, a battery pack does not need to be disassembled, and the control method has the characteristics of low cost, safety, controllability and convenience in operation, and is beneficial to promoting the quick development of the echelon use and energy storage industry.

The technical solution of the present application will be described below with reference to specific embodiments.

The abbreviations for specific terms herein are explained as follows:

BMS: battery Management System, Battery Management System.

SOH: state of Health.

SOC: state of Charge.

And (3) SOP: state of Power, available Power.

SOE: state of Energy, available Energy.

DC/DC: a bidirectional DC chopper.

DCC: a DC/DC controller.

AC/DC: a bidirectional inverter.

ACC: an AC/DC controller.

LCU: local Control Unit, Local controller.

MCU: master Control Unit, Master controller.

CRC: cyclic Redundancy Check.

In a first aspect, an embodiment of the present application provides a method for controlling an energy storage device. Fig. 1 is a schematic structural diagram of an energy storage system. As shown in fig. 1, the energy storage system includes one or more energy storage devices, a main controller MCU, and a main grid connection device. Each energy storage device comprises a local controller LCU, a bidirectional direct current chopper DC/DC and a battery pack. The battery pack includes a battery management system BMS (hereinafter, referred to as a native BMS) and a battery. The bidirectional direct current chopper comprises a bidirectional direct current chopper DC/DC and a controller DCC thereof. The local controller LCU is respectively connected with the native BMS, the controller DCC of the bidirectional DC chopper and the main controller MCU through communication buses (such as a CAN bus or RS485) in a communication way for communication. The battery pack is connected with the bidirectional direct current chopper DC/DC in series and then connected to a common direct current BUS DC BUS. Direct current breakers are arranged between the battery pack and the bidirectional direct current converter DC/DC, between the bidirectional direct current converter DC/DC and the public direct current BUS DC BUS for switching.

Optionally, one or more energy storage devices are connected in parallel to a common DC BUS and then through a DC breaker, a bi-directional inverter AC/DC, a transformer, and finally to an AC external grid.

Optionally, the local Controller LCU is a Controller based on one of Programmable processors such as a single chip, a DSP chip (Digital Signal processor), a PLC (Programmable Logic Controller), a PC, etc., and its role in the energy storage device is mainly to coordinate and control the retired battery pack native BMS and the Controller DCC of the bidirectional dc chopper, including distribution of charging/discharging power, control of the battery dc switch, transmission of DCC start/stop commands, etc.

Optionally, the main Controller MCU is a Controller based on one of Programmable processors such as a single chip, a DSP chip (Digital Signal processor ), a PLC (Programmable Logic Controller), a PC, and the like, and is mainly configured to receive an external scheduling command, receive information such as power, energy, and status related to the energy storage devices and transmitted from each LCU through a communication bus, perform charging/discharging priority ordering on each energy storage device, calculate power and start/stop commands allocated to each energy storage device, and transmit the power and start/stop commands to each subordinate LCU. In addition, the controller AC/DC of the bidirectional inverter is managed in aspects of power demand, starting and stopping command sending and the like through the communication bus.

Optionally, the battery pack may be a new battery pack, or a battery pack that is used in an off-line manner.

Fig. 2 is a flowchart illustrating a method for controlling an energy storage device. As shown in fig. 2, the control method includes:

step S100: battery information of the battery is acquired.

In some embodiments, the execution subject of the control method is a local controller, and may also be a control module disposed in the local controller. Alternatively, the control module may be implemented by software, or by a combination of software and hardware.

As shown in fig. 3, taking as an example a local controller including two major control modules, a secondary BMS module and a Supervisor module, a primary BMS (battery management system for decommissioning a battery pack) transmits battery information of a battery, i.e., data detected by internal sensors, to the secondary BMS module through a communication bus, e.g., a CAN bus or RS 485.

In some embodiments, the battery pack further includes a sensor, as shown in fig. 4, and step S100 includes:

step S110: transmitting wake-up information to the BMS;

step S120: the sensor data read by the BMS is acquired as battery information of the battery.

Optionally, the battery pack includes various built-in sensors, such as a voltage sensor, a current sensor, a temperature sensor, and the like, for detecting the voltage, the current, the temperature, the insulation resistance, and the like of each battery cell in the battery pack. As shown in fig. 3, the secondary BMS module of the local controller transmits a wake-up message to the primary BMS. The wake-up message may wake up the primary BMS to read sensor data of the sensors, such as voltage, current, temperature, insulation resistance (if the primary BMS does not provide insulation resistance information, the secondary BMS module may calculate from the acquired voltage and current information), and the like. The primary BMS reads the sensor data and transmits the read sensor data to the secondary BMS module as battery information of the battery. It will be appreciated that if there are multiple energy storage devices, then a sensor is built into the battery pack of each energy storage device.

In some embodiments, the wake-up information is further used for performing voltage equalization when the voltage difference value of each battery cell in the native BMS exceeds a preset threshold, that is, the "barrel effect" of the battery is eliminated by means of active equalization or passive equalization, so that the available capacity space of the battery can be increased and the service life of the battery can be prolonged.

Step S200: and calculating the state information of the battery according to the battery information.

Optionally, after acquiring battery information such as voltage, current, temperature, insulation resistance, etc., the secondary BMS module performs a series of calculations to generate state information SOX characterizing the retired battery pack, including but not limited to state of energy SOE, state of charge SOC, state of power SOP, state of health SOH (including resistance decay and capacity decay), etc. After the calculation is completed, the secondary BMS module sends the information to the hypervisor supervision module of the local controller.

Step S300: and acquiring power information of the bidirectional direct current chopper.

Optionally, the Supervisor module of the local controller further performs information interaction with the main controller MCU and the controller DCC of the bidirectional dc chopper through a communication bus (e.g., CAN bus or RS 485). The Supervisor supervision module can obtain the power information (generally referred to as rated power) of the DC/DC of the bidirectional DC chopper from the DCC.

Step S400: and acquiring power distribution information sent by the main controller.

Optionally, one or more energy storage devices connected in parallel may be connected below the main controller MCU. The Supervisor monitoring module also receives power distribution information sent by the MCU.

Step S500: and realizing real-time control on the energy storage device according to the state information of the battery, the power information of the bidirectional direct current chopper and the power information issued by the main controller.

Optionally, the Supervisor module implements control of the energy storage device according to the acquired comprehensive information, that is, the state information of the battery, the power information of the bidirectional dc chopper, and the power information issued by the main controller.

In the existing scheme, after the parameter information representing the retired battery pack is sent to an external controller, the battery can be conveniently controlled, but due to the concern of leakage of an algorithm of an own BMS, a whole vehicle factory or a battery factory is not willing to open a communication protocol of the BMS to a third party, so that the development difficulty of gradient utilization of the whole pack is serious. In the embodiment of the present application, the external controller (e.g., the local controller LCU of the present application) makes changes to the information requirements of the native BMS. With the mode that whole package utilized, need not to disassemble the battery package, remain native BMS simultaneously, but do not need native BMS's algorithm agreement, native BMS only need provide the data that retired battery package internal sensor detected, include: voltage, current, temperature, insulation resistance, etc. The information sent by the external controller (e.g., the secondary BMS module of the local controller LCU of the present application) to the primary BMS contains only wake-up information for activating the primary BMS to read sensor data. Because this application need not to disassemble the battery package, consequently have low-cost, safe controllable, convenient operation's characteristics, help promoting the quick development of echelon utilization and energy storage industry.

In some embodiments, the control method further comprises:

Optionally, the information sent by the secondary BMS module to the primary BMS further includes handshake information. As shown in fig. 3, the handshake information may be Watchdog information and/or cyclic Redundancy check (crc) information, which may verify accuracy and validity of sensor data sent by the native BMS, and is beneficial to implementing accurate control of the energy storage device.

In some embodiments, the control method further comprises:

acquiring a start-stop command issued by a main controller;

Alternatively, the secondary BMS module may calculate fault information and switch information of the battery according to the battery information, in addition to calculating the state information of the battery according to the battery information. The failure information of the battery includes, but is not limited to: overvoltage, overcurrent, overtemperature, short circuit, electric leakage, communication error and the like. The switching information of the battery includes, but is not limited to: current state of the switch, switch closure permission information, charge/discharge cutoff signals, and the like. And then sending the calculated fault information and the switch information of the battery to a Supervisor supervision module.

Optionally, the Supervisor module may obtain fault information and state information of the bidirectional DC chopper DC/DC, and a start-stop command issued by the main controller MCU, in addition to the power information of the bidirectional DC chopper DC/DC.

The Supervisor monitoring module realizes real-time control of the energy storage device according to the acquired comprehensive information, namely the state information, the fault information and the switching information of the battery, the power information, the fault information and the state information of the bidirectional direct current chopper, and the power distribution information and the start-stop command issued by the main controller.

Due to the fact that the fault information and the switching information of the battery, the fault information and the state information of the bidirectional direct current chopper and the start-stop command issued by the main controller are added, each link of the whole energy storage system can be guaranteed to run normally, and therefore accurate control over the energy storage device is achieved.

In some embodiments, the fault information of the battery includes, but is not limited to: overvoltage, overcurrent, overtemperature, short circuit, electric leakage, communication error and the like. The switching information of the battery includes, but is not limited to: current state of the switch, switch closure permission information, charge/discharge cutoff signal.

In some embodiments, the controlling of the energy storage device comprises:

charging/discharging the battery, controlling the battery switch and controlling the start/stop of the bidirectional direct current chopper.

Optionally, the Supervisor module controls the BMS to charge/discharge the battery accordingly according to the distribution of the charging/discharging power. The Supervisor supervision module can also control a built-in direct current switch of the battery according to the charging/discharging requirements of the battery. The Supervisor monitoring module can also control the start/stop of the bidirectional direct current chopper according to a start/stop command issued by the main controller.

In some embodiments, the manner of sending down the power allocation information by the master controller includes:

the main controller receives the state information of the battery and the power information of the bidirectional direct current chopper sent by the local controller, and sends power distribution information according to the state information of the battery and the power information of the bidirectional direct current chopper.

Optionally, the main controller MCU receives the result of the comprehensive calculation of the battery-based state information SOX and the power information of the bidirectional DC chopper DC/DC sent by each local controller LCU, calculates the priority allocation order and the size of the allocated power (i.e., power allocation information) of each energy storage device, and then sends the power allocation information to each local controller LCU.

As shown in fig. 5, the following describes the technical solution of the present application with a more complete embodiment:

step S101: the local controller LCU detects whether the low voltage power supply of the native BMS has been powered up.

The local controller LCU needs to ensure that the native BMS has been awakened when receiving the sensor information transmitted from the native BMS, and thus must detect in advance whether the low voltage power supply part of the native BMS has been powered on and is in a normal power supply range, such as a voltage variation range should not exceed 6-18V for a 12V BMS power supply system.

Step S102: after it is confirmed in step S101 that the native BMS system has been powered on, the secondary BMS module of the local controller LCU transmits a wake-up message to the native BMS. After the native BMS is awakened, a series of self tests are performed and then sensor information is output.

Step S103: the secondary BMS module recognizes handshake information with the primary BMS to ensure reliability of sensor information. The mutual authentication may include Watchdog and/or CRC. The Watchdog mainly verifies whether both communication parties are online or not based on a heartbeat detection heartbeat mechanism. The CRC CAN detect whether the CAN communication is interrupted and whether the information sent by the sending end is consistent with the information received by the receiving end.

Step S104: the primary BMS sends sensor information to the secondary BMS module, including: voltage U (maximum voltage, minimum voltage, average voltage), current I, temperature T (maximum temperature, minimum temperature, average temperature), insulation resistance IR.

The maximum voltage refers to the maximum voltage among the voltages of the battery cells in the battery pack, the minimum voltage refers to the minimum voltage among the voltages of the battery cells in the battery pack, and the average voltage refers to the average voltage among the voltages of the battery cells in the battery pack. The maximum temperature refers to the maximum temperature of each electric core in the battery pack, the minimum temperature refers to the minimum temperature of each electric core in the battery pack, and the average temperature refers to the average temperature of each electric core in the battery pack.

With reference to the above description, obtaining the maximum voltage and the minimum voltage can obtain whether the voltage difference value of each battery cell exceeds the preset threshold, and if so, the voltage is balanced by the native BMS, so that the barrel effect is eliminated, the available capacity space of the battery can be increased, and the service life of the battery can be prolonged. The same principle is used for obtaining the maximum temperature and the minimum temperature.

Step S105: after the secondary BMS module receives the sensor information sent by the primary BMS, if the sensor information is confirmed to be valid, the following calculation is performed: various state information SOX of the battery such as: SOE (energy state), SOC (state of charge), SOP (power state), SOH (state of health, including resistance decay and capacity fade); fault information of the battery, such as: overvoltage, overcurrent, overtemperature, short circuit, electric leakage, communication error and the like; switching information of the battery, such as: current state of the switch, switch closure permission information, charge/discharge cutoff signals, and the like. The secondary BMS module then sends the calculation to the hypervisor supervision module of the local controller LCU.

Step S106: the Supervisor module receives the calculation result sent by the secondary BMS module, and communicates with a controller DCC of the bidirectional DC chopper through a communication bus (such as a CAN bus or RS485) to obtain power information, fault information, state information and the like of the DC/DC of the bidirectional DC chopper, and calculates the following information after comprehensive consideration, wherein the information comprises: a maximum chargeable power, a maximum dischargeable power, a minimum chargeable power, a minimum dischargeable power of the energy storage device; status information of the energy storage device, such as available charge, fault status, charge/discharge cutoff signal, etc. And then the Supervisor monitoring module sends the calculation result to the main controller MCU through a communication bus.

Step S107: the main controller MCU calculates the priority distribution sequence and the distribution power of each energy storage device according to the received information of each energy storage device and the power information, the fault information, the state information and the like (if the system does not have the bidirectional inverter AC/DC, the information of the energy storage device is only needed to be obtained), which are sent by the Supervisor supervisory module of each subordinate local controller LCU, and then sends the charging/discharging power and the starting command to each relevant local controller LCU and bidirectional inverter AC/DC.

Step S108: and the local controller LCU detects whether a charging/discharging power demand instruction and a starting command sent by the main controller MCU are received. If yes, go to the next step, otherwise continue to detect.

Step S109: the local controller LCU detects if the energy storage device has a fault message prohibiting the start-up and the battery switch is allowed to close. If the system is fault free and the battery switch is allowed to close, then the next step is entered, otherwise the loop is exited.

Step S1010: the local controller LCU sends a battery switch closing command to close the battery switch; a charge/discharge power command and a start command are sent to the controller DCC of the bidirectional dc chopper. The system starts charging/discharging until the charging/discharging process is finished or a fault exit is encountered halfway.

At this point, a charge/discharge process is completed.

In a third aspect, embodiments of the present application provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method according to the first aspect.

Compared with the prior art, this application has following beneficial effect at least:

1. echelon utilization based on whole package mode need not to disassemble the battery package, remains the mechanical housing of native BMS and battery, has reduced on the one hand owing to disassemble risks such as weeping, fire, explosion that bring, and on the other hand has reduced the operating procedure of recycle to reduce the system utilization cost when promoting the security of echelon utilization, make echelon utilization energy storage system's investment return cycle compare with the mode of disassembling recycling, can reduce 40% -60%.

2. The method has the advantages that a detailed BMS communication protocol is not required to be provided by the whole vehicle factory and the battery factory, the safe and efficient control of the retired battery pack can be completed only by a plurality of basic sensors and awakening information, and any native BMS algorithm is not involved.

3. The whole pack is utilized in a gradient manner before the resources of the battery are regenerated, so that the residual value of the battery can be obviously improved, and a BMS algorithm does not need to be shared by a third party client, so that the participation enthusiasm of a battery factory and a whole vehicle factory can be greatly improved, and the rapid development of a whole pack utilization technology is promoted.

4. The technical scheme of this application can set up in advance and solidify the communication protocol and the bottom drive of all other system input and output information except the sensor information, awaken up information and the handshake information that native BMS provided to can play quick compatibility and network deployment simultaneously to the battery of any brand, be similar to plug and play, be favorable to making this technical scheme a standardized, global general echelon utilization platform.

5. The technical scheme of this application can also realize the voltage balance function of battery self-bring through awakening up native BMS, need not increase extra hardware and can eliminate the "barrel effect" of battery to the life of extension battery.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A method of controlling an energy storage device, the energy storage device comprising a local controller, a bidirectional dc chopper, and a battery pack, the battery pack being connected to a common dc bus through the bidirectional dc chopper, the local controller being communicatively connected to the battery pack, the bidirectional dc chopper, a main controller, respectively, the battery pack comprising a battery management system BMS and a battery, the method comprising:

acquiring battery information of the battery;

acquiring power information of the bidirectional direct current chopper;

acquiring power distribution information issued by the main controller;

2. The method of claim 1, wherein the battery pack further comprises a sensor;

the acquiring of the battery information of the battery includes:

acquiring sensor data read by the BMS as battery information of the battery;

3. The method of claim 2, wherein the wake-up information is further used for performing voltage equalization when a voltage difference value of each cell in the battery pack exceeds a preset threshold.

4. The method of claim 2, further comprising:

5. The method of claim 1, further comprising:

acquiring a start-stop command issued by the main controller;

6. The method of claim 5,

the state information of the battery comprises an energy state SOE, a charge state SOC, a power state SOP and a health state SOH;

7. The method of claim 1, wherein the controlling of the energy storage device comprises:

8. The method according to any one of claims 1 to 7, wherein the manner of sending down the power allocation information by the master controller comprises:

9. Energy storage device, characterized in that it comprises a local controller, a bidirectional direct current chopper and a battery pack, the battery pack being connected to a common direct current bus through the bidirectional direct current chopper, the local controller being communicatively connected with the battery pack, the bidirectional direct current chopper, a main controller, respectively, the battery pack comprising a battery management system BMS and a battery, the local controller being adapted to perform the method according to any of claims 1 to 8.

10. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 8.