Energy storage equipment, energy management system and energy storage system

Abstract

The invention discloses energy storage equipment, an energy management system and an energy storage system, and is applied to the technical field of energy management. The energy storage device comprises an energy storage module and a battery management system. The battery management system comprises a charging and discharging monitoring unit, a parallel operation control unit and a charging and discharging switch, the charging and discharging switch is located in a power supply loop of the energy storage module, and the parallel operation control unit is used for controlling on-off of the charging and discharging switch; and when the battery management system detects a fault, the battery management system sends a fault signal to the energy management system through the parallel operation control unit, so that the energy management system controls the charge and discharge switches of all the energy storage devices to be switched off. Under the condition that any energy storage device breaks down, the energy management system can rapidly receive the fault signal and disconnect the charging and discharging switches of all the energy storage devices, and the safety of all the energy storage devices is guaranteed more rapidly and more reliably.

Description

Technical Field

[0001] The present application belongs to the field of energy management technology, and in particular, relates to an energy storage device, an energy management system, and an energy storage system. Background Art

[0002] With the rapid development of energy storage system integration technology and battery technology, the installed capacity of energy storage equipment has grown rapidly, and the global energy storage market has grown rapidly. With its unique technical advantages, energy storage equipment plays an important role in the fields of new energy power generation, new energy vehicles, and home energy storage, meeting the diverse energy needs in different scenarios.

[0003] Safety is a crucial point for energy storage equipment. Therefore, how to ensure the safety of energy storage equipment is an issue that needs to be addressed urgently. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an energy storage device, an energy management system, and an energy storage system, which can realize that when any energy storage device fails, the energy management system can quickly receive the fault signal and disconnect the charging and discharging switches of all energy storage devices, thereby ensuring the safety of all energy storage devices more quickly and reliably.

[0005] In a first aspect, the present application provides an energy storage device, comprising:

[0006] Energy storage module;

[0007] A battery management system, the battery management system comprising a charge and discharge monitoring unit, a parallel control unit and a charge and discharge switch, the charge and discharge switch is located in the power supply circuit of the energy storage module, and the parallel control unit is used to control the on and off of the charge and discharge switch;

[0008] When a fault is detected, the battery management system sends a fault signal to the energy management system through the parallel control unit, so that the energy management system controls the parallel control units of all the energy storage devices to disconnect the charge and discharge switches.

[0009] In some embodiments, the battery management system also includes a fault monitoring unit, which is connected to the charge and discharge monitoring unit, and the charge and discharge monitoring unit is connected to the charge and discharge switch to collect charge and discharge information. The fault monitoring unit is used to obtain the charge and discharge information and perform fault detection based on the charge and discharge information to obtain a fault detection result, and the fault detection result includes whether the energy storage device has a fault.

[0010] In some embodiments, the fault monitoring unit is connected to the parallel control unit. When the fault detection result indicates that the energy storage device is faulty, the fault monitoring unit sends the fault signal to the parallel control unit, and the parallel control unit forwards the fault signal to the energy management system.

[0011] In some embodiments, the parallel control unit also includes a voltage pull-up circuit, which is arranged on the connection line between the fault monitoring unit and the parallel control unit, and the voltage pull-up circuit is used to output a high level. The fault signal includes a charging fault signal and a discharging fault signal, and the fault signals are all low levels.

[0012] In some embodiments, the charge and discharge switch includes a charge switch and a discharge switch, and the parallel control unit includes a charge control switch and a discharge control switch, the charge control switch is located on a charge enable circuit between the charge switch and the charge and discharge monitoring unit, and the charge control switch is used to control the on and off of the charge enable circuit, and the discharge control switch is set on a discharge enable circuit between the discharge switch and the charge and discharge monitoring unit, and the discharge control switch is used to control the on and off of the discharge enable circuit.

[0013] In some embodiments, the energy management system generates a charging disconnection signal based on the charging fault signal, and generates a discharging disconnection signal based on the discharging fault signal; the charging control switch is connected to the energy management system through a charging control circuit, and the discharging control switch is connected to the energy management system through a discharging control circuit;

[0014] The parallel control unit controls the charging control switch to be disconnected when receiving a charging disconnection signal sent by the energy management system through the charging control line;

[0015] The parallel control unit controls the discharge control switch to be disconnected when receiving a discharge disconnection signal sent by the energy management system through the discharge control circuit;

[0016] The parallel control unit controls the charging control switch to close when receiving a charging closing signal sent by the energy management system through the charging control line;

[0017] The parallel control unit controls the discharge control switch to be closed when receiving the discharge closing signal sent by the energy management system through the discharge control line.

[0018] In some embodiments, the charge and discharge monitoring unit is used to generate a charge enable signal or a discharge enable signal, and the charge switch is closed when receiving the charge enable signal; the discharge switch is closed when receiving the discharge enable signal.

[0019] In some embodiments, when the energy storage device is initialized online, the energy management system generates the charging disconnection signal and the discharging disconnection signal to control the charging control switch and the discharging control switch to be disconnected; the charging and discharging monitoring unit is used to generate a charging prohibition signal and a discharging prohibition signal to disconnect the charging and discharging switches.

[0020] In some embodiments, the charge and discharge switch includes a charging switch, a charging diode, a discharging switch and a discharging diode. The charging switch and the charging diode are connected in parallel, and the conduction direction of the charging diode is opposite to the charging current direction of the energy storage module. The discharging switch and the discharging diode are connected in parallel, and the conduction direction of the discharging diode is opposite to the discharging current direction of the energy storage module.

[0021] In some embodiments, when the energy storage device is charged online, the charging switch is controlled to be turned on by the parallel control unit;

[0022] When the charge and discharge monitoring unit detects that the charging current is greater than a preset threshold, the parallel control unit controls the discharge switch to be closed.

[0023] In some embodiments, when the energy storage device is discharged online, the discharge switch is controlled to be turned on by the parallel control unit;

[0024] When the charge and discharge monitoring unit detects that the discharge current is greater than a preset threshold, the parallel control unit controls the charging switch to be closed.

[0025] In a second aspect, the present application provides an energy management system, comprising:

[0026] A parallel management module, wherein the parallel management module is connected to the parallel control units of each energy storage device;

[0027] When receiving a fault signal sent by any of the parallel control units, the parallel management module controls the corresponding charge and discharge switches to be disconnected through the parallel control units of each of the energy storage devices.

[0028] In some embodiments, the parallel management module includes a voltage pull-up unit, which includes a power supply, a resistor and a diode. The diode is located on the charge and discharge control circuit between the parallel control unit and the parallel management module, and the power supply is connected to the charge and discharge control circuit through the resistor.

[0029] In a third aspect, the present application provides an energy storage system, comprising:

[0030] A plurality of energy storage devices as described in any one of the above items;

[0031] The energy management system described above.

[0032] In some embodiments, the energy storage system further includes a photovoltaic storage inverter system, which is connected to each of the energy storage devices. When the energy storage system operates in a discharge mode, the photovoltaic storage inverter system is used to convert the direct current power output by the energy storage device into alternating current and output it. When the energy storage system operates in a charging mode, the photovoltaic storage inverter system is used to convert the input alternating current into direct current and output it to the energy storage device.

[0033] The energy storage device, energy management system and energy storage system provided in the embodiments of the present application place the fault detection work in the battery management system of each energy storage device, and quickly feedback the fault signal and control the on and off of the charging and discharging switches through a parallel control unit directly connected to the energy management system.

[0034] Compared to transmitting fault-related detection information to the energy management system for judgment and processing, the energy management system feeds back the fault result to the battery management system, and the battery management system then processes the fault, which has a slow fault response speed. In the present application, when the battery management system of any energy storage device detects a fault, the parallel control unit can send a fault signal to the energy management system and be directly controlled by the energy management system to disconnect the corresponding charging and discharging switches, and the fault response efficiency is faster.

[0035] The energy management system no longer needs to process the fault-related detection information transmitted by the battery management system. By receiving the fault signal sent by the parallel control unit in the battery management system, it can quickly shut down the charging and discharging switches of all energy storage devices, thereby ensuring the safety of all energy storage devices more quickly and reliably.

[0036] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 is a schematic diagram of the structure of the energy storage device provided in the embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the structure of a conventional energy storage device;

[0040] Figure 3 is a schematic diagram of the structure of the energy management system provided in an embodiment of the present application;

[0041] Figure 4 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application; DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0043] See also Figure 1 , an embodiment of the present application provides an energy storage device 100, which is described in detail below.

[0044] The energy storage device 100 includes an energy storage module 110 and a battery management system 120. The battery management system 120 includes a charge and discharge monitoring unit 140, a parallel control unit 150 and a charge and discharge switch 130. The charge and discharge switch 130 is located in the power supply circuit 111 of the energy storage module 110. The parallel control unit 150 is used to control the on and off of the charge and discharge switch 130.

[0045] When a fault is detected, the battery management system 120 sends a fault signal to the energy management system 200 through the parallel control unit 150 , so that the energy management system 200 controls the charge and discharge switches 130 of all energy storage devices 100 to be disconnected.

[0046] Among them, the Energy Management System 200 (EMS) is a comprehensive system for monitoring, controlling and optimizing energy use. The Energy Management System 200 integrates advanced information technology, automation technology and energy-related expertise to help various organizations (such as industrial enterprises, commercial buildings, public institutions, etc.) achieve efficient energy management, thereby reducing energy consumption, improving energy utilization efficiency, reducing energy costs, and promoting sustainable development.

[0047] Among them, the battery management system 120 (Battery Management System, referred to as BMS) is a system that comprehensively manages and monitors the battery module (or battery pack). The battery management system 120 monitors the voltage, current, temperature and other parameters of the battery module in real time to ensure the safe, efficient and stable operation of the battery module.

[0048] The fault signal may be a signal sent by the battery management system 120 when a fault is detected, and is used to indicate that a fault has occurred in the energy storage device 100 .

[0049] Optionally, the battery management system 120 includes a fault monitoring unit 160 for performing fault detection. When the fault monitoring unit 160 detects a fault in the energy storage device 100 , a fault signal is issued. The fault signal may be a low level signal or a high level signal.

[0050] Specifically, the energy storage module 110 performs the charging and discharging process through the power supply circuit 111. The charging and discharging switch 130 in the battery management system 120 is located in the power supply circuit 111 of the energy storage module 110, and can control the charging and discharging process of the energy storage module 110. The parallel control unit 150 in the battery management system 120 can control the on and off of the charging and discharging switch 130, and further control the charging and discharging process of the energy storage module 110.

[0051] When the battery management system 120 detects that there is a fault in the energy storage device 100, the parallel control unit 150 in the battery management system 120 transmits a fault signal to the energy management system 200. After receiving the fault signal, the energy management system 200 outputs a disconnection signal to control the charge and discharge switches 130 of all energy storage devices 100 to disconnect.

[0052] See also Figure 2 In the case of a fault in the energy storage device, the battery management system of the conventional energy storage device sends the real-time charge and discharge information of the detected energy storage module to the energy management system. The energy management system analyzes the real-time charge and discharge information of the energy storage module, determines that the energy storage module has a fault, and then sends a disconnection command to the battery management system of each energy storage module. After receiving the disconnection command, the battery management system of each energy storage module disconnects the charging switch and the discharging switch. The entire response process takes a long time and the fault cannot be isolated in time.

[0053] By comparison, it can be seen that the energy storage device 100 provided in the embodiment of the present application detects faults through the battery management system 120, and the parallel control unit 150 transmits a fault signal to the energy management system 200. After receiving the fault signal, the energy management system 200 disconnects the charge and discharge switches 130 of all energy storage devices 100. In this way, when any energy storage device 100 fails, the charge and discharge switches 130 of all energy storage devices 100 can be quickly disconnected, thereby ensuring the safety of all energy storage devices 100 more quickly and reliably.

[0054] In some embodiments, the battery management system 120 also includes a fault monitoring unit 160, which is connected to the charge and discharge monitoring unit 140, and the charge and discharge monitoring unit 140 is connected to the charge and discharge switch 130 to collect charge and discharge information. The fault monitoring unit 160 is used to obtain the charge and discharge information and perform fault detection based on the charge and discharge information to obtain a fault detection result, and the fault detection result includes whether the energy storage device 100 has a fault.

[0055] Specifically, the charge and discharge switch 130 is located in the power supply circuit 111 of the energy storage module 110, and stores the real-time charge and discharge information of the energy storage module 110. The charge and discharge monitoring unit 140 is connected to the charge and discharge switch 130, and can collect real-time and accurate charge and discharge information. The battery management system 120 also includes a fault monitoring unit 160, which can obtain the charge and discharge information collected by the charge and discharge monitoring unit 140, and then determine whether the energy storage device 100 has a fault problem. For example, when the charge and discharge information indicates that the charging current of the current energy storage device 100 is too large, the fault monitoring unit 160 can determine that the energy storage device 100 has a fault.

[0056] In this way, the independently arranged fault monitoring unit 160 can quickly determine whether the energy storage device 100 has a fault, thereby improving the fault detection efficiency.

[0057] In some embodiments, the fault monitoring unit 160 is connected to the parallel control unit 150. When the fault detection result indicates that the energy storage device 100 is faulty, the fault monitoring unit 160 sends a fault signal to the parallel control unit 150, and the parallel control unit 150 forwards the fault signal to the energy management system 200.

[0058] In some embodiments, the parallel control unit 150 also includes a voltage pull-up circuit 170, which is arranged on the connection line between the fault monitoring unit 160 and the parallel control unit 150. The voltage pull-up circuit 170 is used to output a high level. The fault signal includes a charging fault signal and a discharging fault signal. When a fault occurs in the energy storage device 100, the fault signals are all low levels.

[0059] Specifically, the fault monitoring unit 160 is connected to the parallel control unit 150. When a fault occurs in the energy storage device 100, the fault detection result is that a fault occurs in the energy storage device 100. Then, the fault monitoring unit 160 sends a fault signal to the parallel control unit 150 through the connection line between the fault monitoring unit 160 and the parallel control unit 150.

[0060] The parallel control unit 150 also includes a voltage pull-up circuit 170. The voltage pull-up circuit 170 is arranged on the connection line between the fault monitoring unit 160 and the parallel control unit 150. The voltage pull-up circuit 170 includes a first pull-up power supply 171, a first charging pull-up resistor 172, a first discharging pull-up resistor 173, a first charging pull-up diode 174 and a first discharging pull-up diode 175. One end of the first charging pull-up resistor 172 is connected to the first pull-up power supply 171, and the other end is connected to the charging control circuit 113; one end of the first discharging pull-up resistor 173 is connected to the first pull-up power supply 171, and the other end is connected to the discharging control circuit 112; the cathode of the first charging pull-up diode 174 is connected to the fault monitoring unit 160, and the anode is connected to the charging control circuit 113; the cathode of the first discharging pull-up diode 175 is connected to the fault monitoring unit 160, and the anode is connected to the discharging control circuit 112.

[0061] Optionally, the fault signal includes a charging fault signal and a discharging fault signal. During the charging process of the energy storage device 100, if a fault occurs, the fault monitoring unit 160 generates a charging fault signal, which is a low-level signal. During the discharging process of the energy storage device 100, if a fault occurs, the fault monitoring unit 160 generates a discharging fault signal, which is a low-level signal.

[0062] When the fault detection result is that the energy storage device 100 does not have a fault, the fault monitoring unit 160 generates a charge and discharge permission signal and sends it to the charge and discharge fault detection circuit. The charge and discharge permission signal includes a charge permission signal and a discharge permission signal. The charge and discharge permission signals are both high level signals. They pass through the charge and discharge fault detection circuit to reach the cathode of the first charge pull-up diode 174 and the first discharge pull-up diode 175. The positive and negative electrodes of the first charge pull-up diode 174 and the first discharge pull-up diode 175 are both high level, and no current flows through them, which is equivalent to a disconnected switch. The first pull-up power supply 171 provides a high level for the charge control circuit 113 and the discharge control circuit 112 through the first charge pull-up resistor 172 and the first discharge pull-up resistor 173, allowing charging and discharging.

[0063] When the fault detection result is that the energy storage device 100 has a charging fault, the fault monitoring unit 160 sends a charging fault signal and a discharge permission signal. The charging fault signal reaches the cathode of the first charging pull-up diode 174 through the charging fault detection circuit 176. The first charging pull-up diode 174 is turned on. The charging fault signal is transmitted to the parallel control unit 150 through the cathode of the first charging pull-up diode 174. The parallel control unit 150 transmits the charging fault signal to the energy management system 200 through the charging control circuit 113. The discharge permission signal reaches the cathode of the first discharge pull-up diode 175 through the discharge fault detection circuit 177. The positive and negative electrodes of the first discharge pull-up diode 175 are both high level. The first pull-up power supply 171 provides a high level to the discharge control circuit 112 through the first discharge pull-up resistor 173, and discharge is allowed.

[0064] When the fault detection result is that the energy storage device 100 has a discharge fault, the fault monitoring unit 160 sends a charge permission signal and a discharge fault signal. The discharge fault signal reaches the cathode of the first discharge pull-up diode 175 through the discharge fault detection circuit 177. The first discharge pull-up diode 175 is turned on. The discharge fault signal is transmitted to the parallel control unit 150 through the cathode of the first discharge pull-up diode 175. The parallel control unit 150 transmits the charge fault signal to the energy management system 200 through the discharge control circuit 112. The charge permission signal reaches the cathode of the first charge pull-up diode 174 through the charge fault detection circuit 176. The positive and negative electrodes of the first charge pull-up diode 174 are both high level. The first pull-up power supply 171 provides a high level to the charge control circuit 113 through the first charge pull-up resistor 172, and charging is allowed.

[0065] In this way, the fault monitoring unit 160 provides a fault signal, and the voltage pull-up circuit 170 transmits the fault signal, so that the response speed of the energy storage device 100 can be improved.

[0066] In some embodiments, the charge and discharge switch 130 includes a charge switch 132 and a discharge switch 134, and the parallel control unit 150 includes a charge control switch 151 and a discharge control switch 152. The charge control switch 151 is located on the charge enable circuit between the charge switch 132 and the charge and discharge monitoring unit 140, and the charge control switch 151 is used to control the on and off of the charge enable circuit. The discharge control switch 152 is set on the discharge enable circuit between the discharge switch 134 and the charge and discharge monitoring unit 140, and the discharge control switch 152 is used to control the on and off of the discharge enable circuit.

[0067] Specifically, the charge and discharge switch 130 includes a charge switch 132 and a discharge switch 134. The charge switch 132 is connected to the charge and discharge monitoring unit 140 via a charge enable line, and the discharge switch 134 is connected to the charge and discharge monitoring unit 140 via a discharge enable line. The parallel control unit 150 includes a charge control switch 151 and a discharge control switch 152. The charge control switch 151 is located on the charge enable line between the charge switch 132 and the charge and discharge monitoring unit 140, and can control the on and off of the charge enable line; the discharge control switch 152 is located on the discharge enable line between the discharge switch 134 and the charge and discharge monitoring unit 140, and can control the on and off of the discharge enable line;

[0068] In this way, the charge and discharge switch 130 can be controlled to be opened and closed through the charge and discharge monitoring unit 140 , the charge control switch 151 , and the discharge control switch 152 .

[0069] In some embodiments, the energy management system 200 generates a charging disconnection signal based on the charging fault signal and generates a discharging disconnection signal based on the discharging fault signal; the charging control switch 151 is connected to the energy management system 200 via the charging control line 113, and the discharging control switch 152 is connected to the energy management system 200 via the discharging control line 112;

[0070] When receiving the charging disconnection signal sent by the energy management system 200 through the charging control line 113, the parallel control unit 150 controls the charging control switch 151 to be disconnected;

[0071] When receiving the discharge disconnection signal sent by the energy management system 200 through the discharge control line 112, the parallel control unit 150 controls the discharge control switch 152 to be disconnected;

[0072] When receiving the charging closing signal sent by the energy management system 200 through the charging control line 113, the parallel control unit 150 controls the charging control switch 151 to close;

[0073] When receiving the discharge closing signal sent by the energy management system 200 through the discharge control line 112 , the parallel control unit 150 controls the discharge control switch 152 to close.

[0074] Specifically, the energy management system 200 generates a charge disconnection signal after receiving a charge fault signal; generates a discharge disconnection signal after receiving a discharge fault signal. The charge control switch 151 is connected to the energy management system 200 via the charge control line 113 and is controlled by the signal of the energy management system 200; the discharge control switch 152 is connected to the energy management system 200 via the discharge control line 112 and is controlled by the signal of the energy management system 200.

[0075] When there is a charging fault in the energy storage device 100, the energy management system 200 generates a charging disconnection signal after receiving the charging fault signal. The charging disconnection signal is transmitted to the parallel control unit 150 through the charging control line 113. The parallel control unit 150 controls the charging control switch 151 to disconnect based on the charging disconnection signal.

[0076] When there is no charging fault in the energy storage device 100 and the energy management system 200 generates a charging disconnection signal, the charging disconnection signal is transmitted to the parallel control unit 150 through the charging control line 113, and the parallel control unit 150 controls the charging control switch 151 to be disconnected based on the charging disconnection signal;

[0077] When there is no charging fault in the energy storage device 100 and the energy management system 200 generates a charging closing signal, the charging closing signal is transmitted to the parallel control unit 150 through the charging control line 113, and the parallel control unit 150 controls the charging control switch 151 to close based on the charging closing signal;

[0078] When there is a discharge fault in the energy storage device 100, the energy management system 200 generates a discharge disconnection signal after receiving the discharge fault signal. The discharge disconnection signal is transmitted to the parallel control unit 150 through the discharge control line 112. The parallel control unit 150 controls the discharge control switch 152 to be disconnected based on the discharge disconnection signal.

[0079] When there is no discharge fault in the energy storage device 100 and the energy management system 200 generates a discharge disconnection signal, the discharge disconnection signal is transmitted to the parallel control unit 150 through the discharge control line 112, and the parallel control unit 150 controls the discharge control switch 152 to be disconnected based on the discharge disconnection signal;

[0080] When there is no discharge fault in the energy storage device 100 and the energy management system 200 generates a discharge closing signal, the discharge closing signal is transmitted to the parallel control unit 150 through the discharge control line 112, and the parallel control unit 150 controls the discharge control switch 152 to close based on the discharge closing signal;

[0081] In this way, the energy management system 200 can quickly generate a new signal according to the fault signal, and transmit it to the parallel control unit 150 to control the on and off of charging and discharging of the energy storage device 100.

[0082] In some embodiments, the charge and discharge monitoring unit 140 is used to generate a charge enable signal or a discharge enable signal, and the charge switch 132 is closed when receiving the charge enable signal; the discharge switch 134 is closed when receiving the discharge enable signal.

[0083] Specifically, the charge and discharge monitoring unit 140 in the battery management system 120 can generate a charge enable signal or a discharge enable signal. When the charge control switch 151 of the parallel control unit 150 is closed, the charge enable signal can be transmitted to the charge switch 132 through the charge enable line; when the charge control switch 151 is disconnected, the charge switch 132 cannot receive the charge enable signal. When the discharge control switch 152 of the parallel control unit 150 is closed, the discharge enable signal can be transmitted to the discharge switch 134 through the discharge enable line; when the discharge control switch 152 is disconnected, the discharge switch 134 cannot receive the discharge enable signal.

[0084] In this way, the charge and discharge monitoring unit 140 can control the charge and discharge of the energy storage device 100 by generating different enable signals.

[0085] In some embodiments, the charge and discharge switch 130 includes a charging switch 132, a charging diode 131, a discharging switch 134 and a discharging diode 133. The charging switch 132 and the charging diode 131 are connected in parallel, and the conduction direction of the charging diode 131 is opposite to the charging current direction of the energy storage module 110. The discharging switch 134 and the discharging diode 133 are connected in parallel, and the conduction direction of the discharging diode 133 is opposite to the discharging current direction of the energy storage module 110.

[0086] Specifically, the charge and discharge switch 130 is located in the power supply circuit 111 of the energy storage module 110, and includes a charging switch 132, a charging diode 131, a discharging switch 134 and a discharging diode 133. The charging part is the charging switch 132 connected in parallel with the charging diode 131, and the conduction direction of the charging diode 131 is opposite to the charging current direction of the energy storage module 110; the discharging part is the discharging switch 134 connected in parallel with the discharging diode 133, and the conduction direction of the discharging diode 133 is opposite to the discharging current direction of the energy storage module 110. The charging part and the discharging part are connected in series on the power supply circuit 111 of the energy storage module 110.

[0087] For example, the charging switch 132 may be a charging MOS tube group, and the discharging switch 134 may be a discharging MOS tube group.

[0088] In this way, the charge and discharge of the energy storage device 100 can be directly controlled by the charge and discharge switch 130 .

[0089] In some embodiments, when the energy storage device 100 is initialized online, the energy management system 200 generates a charge disconnection signal and a discharge disconnection signal to control the charge control switch 151 and the discharge control switch 152 to be disconnected; the charge and discharge monitoring unit 140 is used to generate a charge prohibition signal and a discharge prohibition signal to disconnect the charge and discharge switch 130.

[0090] Specifically, when the energy storage device 100 is initialized online, the energy management system 200 generates a charging disconnection signal and a discharging disconnection signal. The charging disconnection signal is transmitted to the parallel control unit 150 through the charging control line 113 to disconnect the charging control switch 151. The discharging disconnection signal is transmitted to the parallel control unit 150 through the discharging control line 112 to disconnect the discharging control switch 152.

[0091] When the energy storage device 100 is initialized online, the charge and discharge monitoring unit 140 generates a charge prohibition signal and a discharge prohibition signal. When there is no charge enable signal on the charge enable line and the charge control switch 151 is disconnected, the charge switch 132 is disconnected; when there is no discharge enable signal on the discharge enable line and the discharge control switch 152 is disconnected, the discharge switch 134 is disconnected. In this way, the charge and discharge of the energy storage device 100 are prohibited.

[0092] When the energy storage device 100 is initialized online, after charging and discharging of the energy storage device 100 are prohibited, the energy management system 200 obtains the current fault detection result of the fault monitoring unit 160 of the battery management system 120, and then determines whether the energy storage device 100 has a fault. If there is a fault, the online process is terminated; if there is no fault, charging or discharging is performed on the energy storage device 100 according to the charging or discharging judgment of the energy management system 200.

[0093] In this way, when the energy storage device 100 is initialized online, the energy management system 200 and the charge-discharge monitoring unit 140 both ensure that the charge-discharge switch 130 is in the off state.

[0094] In some embodiments, when the energy storage device 100 is charged online, the charging switch 132 is controlled to be turned on by the parallel control unit 150;

[0095] When the charge and discharge monitoring unit 140 detects that the charging current is greater than a preset threshold, the parallel control unit 150 controls the discharge switch 134 to be closed.

[0096] Specifically, when the energy storage device 100 is charged online, charging preparation is first performed, and the energy management system 200 generates a discharge disconnection signal, which is transmitted to the discharge control switch 152 of the parallel control unit 150 through the discharge control line 112. The discharge control switch 152 is disconnected, and the energy storage device 100 is prohibited from discharging; the charge and discharge monitoring unit 140 of the battery management system 120 generates a discharge prohibition signal to prohibit the energy storage device 100 from discharging.

[0097] Then, charging is carried out online, the fault monitoring unit 160 of the battery management system 120 outputs a charging permission signal, and both ends of the first charging pull-up diode 174 in the parallel control unit 150 are high level, allowing the energy storage device 100 to charge; the charge and discharge monitoring unit 140 generates a charging enable signal, allowing the energy storage device 100 to charge; the energy management system 200 generates a charging closure signal, and the charging closure signal is transmitted to the charging control switch 151 of the parallel control unit 150 through the charging control line 113, and the charging control switch 151 is closed, allowing the energy storage device 100 to charge; in this way, the parallel control unit 150 can transmit the charging enable signal to the charging switch 132, and the charging switch 132 is closed, and the energy storage device 100 can be charged. The energy management system 200 sends a charging command to the photovoltaic storage inverter system 300, sets the current-limited charging output of the photovoltaic storage inverter system 300 according to the receivable current of the energy storage device 100, and starts charging.

[0098] Among them, the power conversion system 300 (PCS for short) is a comprehensive system that combines solar photovoltaic power generation with energy storage and converts direct current into alternating current to achieve storage, conversion and output of electrical energy.

[0099] When charging starts, the charging current enters through the positive electrode of the discharge diode 133, the discharge diode 133 is turned on, and then the current enters the energy storage module 110 through the closed charging switch 132. The charge and discharge monitoring unit 140 detects the magnitude of the charging current. The preset threshold is a current value preset based on experience. When the charging current is greater than the preset threshold, it indicates that the energy storage device 100 is being charged at this time. At this time, the parallel control unit 150 receives the discharge enable signal of the charge and discharge monitoring unit 140 and the discharge closure signal of the energy management system 200, and controls the discharge switch 134 to close. In this way, the charging current can enter the energy storage module 110 through the closed discharge switch 134 and the closed charging switch 132, and the charging power is higher. When multiple energy storage devices 100 are in charging mode, closing the discharge switch 134 of one or more energy storage devices 100 will prevent the energy storage device 100 from discharging, thereby avoiding the risk of circulating current due to voltage difference between the energy storage devices 100.

[0100] During the charging process of the energy storage device 100, the charge and discharge monitoring unit 140 detects the voltage of the energy storage module 110. If the voltage of the energy storage module 110 does not reach the preset charging voltage threshold, which is a voltage value preset based on an empirical value, charging continues. If the voltage of the energy storage module 110 reaches the preset charging voltage threshold, the charge and discharge monitoring unit 140 generates a charging prohibition signal to prohibit the charging process of the energy storage module 110, protect the safety of the energy storage device 100, and set a charging offline flag for the energy storage device 100.

[0101] In this way, by controlling the charging of the energy storage devices 100 through the parallel control unit 150 , the risk of circulating current between the energy storage devices 100 can be avoided, thereby improving the safety of the energy storage devices 100 .

[0102] In some embodiments, when the energy storage device 100 is discharged and online, the discharge switch 134 is controlled to be turned on by the parallel control unit 150;

[0103] When the charge and discharge monitoring unit 140 detects that the discharge current is greater than a preset threshold, the parallel control unit 150 controls the charging switch 132 to be closed.

[0104] Specifically, when the energy storage device 100 is discharged online, discharge preparation is first performed, and the energy management system 200 generates a charging disconnection signal, which is transmitted to the charging control switch 151 of the parallel control unit 150 through the charging control line 113. The charging control switch 151 is disconnected, and the energy storage device 100 is prohibited from charging; the charge and discharge monitoring unit 140 of the battery management system 120 generates a charging prohibition signal to prohibit the energy storage device 100 from charging.

[0105] Then the discharge is put on line, the fault monitoring unit 160 of the battery management system 120 outputs a discharge permission signal, and both ends of the first discharge pull-up diode 175 in the parallel control unit 150 are high level, allowing the energy storage device 100 to discharge; the charge and discharge monitoring unit 140 generates a discharge enable signal, allowing the energy storage device 100 to discharge; the energy management system 200 generates a discharge closing signal, and the discharge closing signal is transmitted to the discharge control switch 152 of the parallel control unit 150 through the discharge control line 112, and the discharge control switch 152 is closed, allowing the energy storage device 100 to discharge; in this way, the parallel control unit 150 can transmit the discharge enable signal to the discharge switch 134, and the discharge switch 134 is closed, and the energy storage device 100 can discharge. The energy management system 200 sends a discharge command to the photovoltaic storage inverter system 300, sets the current-limited discharge output of the photovoltaic storage inverter system 300 according to the output current of the energy storage device 100, and starts discharging.

[0106] When discharging starts, the discharge current flows out through the positive electrode of the charging diode 131, the charging diode 131 is turned on, and then the current is output through the closed charging switch 132. The charge and discharge monitoring unit 140 detects the magnitude of the discharge current. When the discharge current is greater than the preset threshold, it indicates that the energy storage device 100 is discharging at this time. At this time, the parallel control unit 150 receives the charging enable signal of the charge and discharge monitoring unit 140 and the charging closure signal of the energy management system 200, and controls the charging switch 132 to close. In this way, the discharge current can be output through the closed charging switch 132 and the closed discharge switch 134, and the discharge power is higher. When multiple energy storage devices 100 are in the discharge mode, closing the charging switch 132 of one or more energy storage devices 100 will prevent the energy storage device 100 from being charged, thereby avoiding the risk of circulating current due to voltage difference between the energy storage devices 100.

[0107] During the discharge process of the energy storage device 100, the charge and discharge monitoring unit 140 detects the voltage of the energy storage module 110. If the voltage of the energy storage module 110 does not reach the preset discharge voltage threshold, which is a voltage value preset based on an empirical value, the discharge continues. If the voltage of the energy storage module 110 reaches the preset discharge voltage threshold, the charge and discharge monitoring unit 140 generates a discharge prohibition signal to prohibit the discharge process of the energy storage module 110, protect the safety of the energy storage device 100, and set a discharge offline flag for the energy storage device 100.

[0108] In this way, by controlling the discharge upper limit of the energy storage device 100 through the parallel control unit 150 , the risk of circulating current between the energy storage devices 100 can be avoided, thereby improving the safety of the energy storage device 100 .

[0109] See also Figure 2 In the process of parallel operation, conventional energy storage equipment usually adopts charging to go online, and the energy storage module with the lowest total voltage is selected to go online first. As charging progresses, the voltage of the power supply circuit gradually increases. When the total voltage of a certain energy storage module is slightly different from the voltage of the power supply circuit, the energy management system controls the closing of the charging switch and the discharging switch of the energy storage module. There may be a voltage difference between the energy storage module and the energy storage module with the lowest total voltage that is online first, which causes a circulation between the energy storage modules and damages the safety of the energy storage modules.

[0110] By comparison, it can be seen that the energy storage device 100 provided in the embodiment of the present application receives a fault signal through the parallel management module 210 of the energy management system 200, sends a charging disconnection signal and a discharging disconnection signal to the parallel control unit 150 of the energy storage device 100, controls the disconnection of the charging control switch 151 and the discharging switch 152, and then disconnects the charging and discharging process of the energy storage device 100, which can ensure the safety of the energy storage device 100. Therefore, during the online process of the energy storage device 100, all energy storage devices 100 can be controlled to be online and connected in parallel in a charging manner, and the energy storage devices 100 with low capacity and low total voltage can be charged first; or all energy storage devices 100 can be controlled to be online and connected in parallel in a discharging manner, and the energy storage devices 100 with high capacity and high total voltage can be discharged first. In this way, the availability and flexibility of the energy storage device 100 and the energy management system 200 are improved.

[0111] By comparison, it can be seen that the energy storage device 100 provided in the embodiment of the present application, when the energy storage device 100 is put online in parallel, the battery management system 120 detects the charging current or discharging current of the energy storage device 100. If the charging current of the energy storage device 100 is greater than the preset threshold, it indicates that the energy storage device 100 is charging, and then the discharge switch 134 is controlled to be closed; if the discharge current of the energy storage device 100 is greater than the preset threshold, it indicates that the energy storage device 100 is discharging, and then the charging switch 132 is controlled to be closed. After it has been confirmed that the energy storage device 100 is charging or discharging, closing the discharge switch 134 or the charging switch 132 will not generate a circulating current. In this way, the risk of circulating current between the energy storage devices 100 during the parallel operation is eliminated, and the safety of the energy storage device is improved.

[0112] See also Figure 3 , an embodiment of the present application provides an energy management system 200, which is described in detail below.

[0113] The energy management system 200 includes a parallel management module 210, and the parallel management module 210 is connected to the parallel control unit 150 of each energy storage device 100;

[0114] When receiving a fault signal sent by any parallel control unit 150 , the parallel management module 210 controls the corresponding charge and discharge switches 130 to be disconnected through the parallel control units 150 of each energy storage device 100 .

[0115] The parallel management module 210 includes a voltage pull-up unit 220, which includes a second pull-up power supply 221, a second charging pull-up resistor 222, a second discharging pull-up resistor 223, a second charging pull-up diode 224, and a second discharging pull-up diode 225. The diode is located on the charge and discharge control circuit between the parallel control unit and the parallel management module, and the power supply is connected to the charge and discharge control circuit through a resistor.

[0116] One end of the second charging pull-up resistor 222 is connected to the second pull-up power supply 221, and the other end is connected to the charging control circuit 113; one end of the second discharging pull-up resistor 223 is connected to the second pull-up power supply 221, and the other end is connected to the discharging control circuit 112; the positive electrode of the second charging pull-up diode 224 is connected to the charging control circuit 113, and the negative electrode is connected to the inside of the parallel management module 210; the positive electrode of the second discharging pull-up diode 225 is connected to the discharging control circuit 112, and the negative electrode is connected to the inside of the parallel management module 210.

[0117] Specifically, the energy management system 200 includes a parallel management module 210, and the parallel management module 210 is connected to the parallel control unit 150 of each energy storage device 100 through each charging control circuit 113 and the discharging control circuit 112. The parallel management module 210 can generate a charging closing signal, a charging disconnecting signal, a discharging closing signal, and a discharging disconnecting signal through the second voltage pull-up unit 220. Upon receiving a fault signal, the parallel management module 210 generates a corresponding charging and discharging disconnecting signal, and controls the parallel control unit 150 of each energy storage device 100 to control the corresponding charging and discharging switch 130 to disconnect through each charging and discharging control circuit.

[0118] In this way, when a fault occurs in any energy storage device 100, the fault monitoring unit 160 of the battery management system 120 generates a corresponding charge and discharge fault signal, and the charge and discharge fault signal is transmitted to the parallel management module 210 of the energy management system 200 through the parallel control unit 150. The parallel management module 210 generates a corresponding charge and discharge disconnection signal based on the received charge and discharge fault signal, and the charge and discharge disconnection signal is transmitted to the parallel control units 150 of all energy storage devices 100 to disconnect the charge and discharge process.

[0119] Compared with the conventional battery management system 120 that collects the charging and discharging information of the energy storage device 100 and then transmits it to the energy management system 200, and the energy management system 200 parses the charging and discharging information to obtain fault information and then responds, the fault monitoring unit 160 of the present application generates a corresponding charging and discharging fault signal, and the energy management system 200 receives the corresponding charging and discharging fault signal, which can respond to the fault problem more quickly and ensure the safety of all energy storage devices 100 more quickly and reliably.

[0120] See also Figure 4 , an embodiment of the present application provides an energy storage system 1000, which is described in detail below.

[0121] The energy storage system 1000 includes a plurality of any of the above energy storage devices 100 and the above energy management system 200;

[0122] In some embodiments, the energy storage system 1000 also includes a photovoltaic storage inverter system 300, which is connected to each energy storage device 100. When the energy storage system 1000 operates in a discharge mode, the photovoltaic storage inverter system 300 is used to convert the direct current power output by the energy storage device 100 into alternating current and output it. When the energy storage system 1000 operates in a charging mode, the photovoltaic storage inverter system 300 is used to convert the input alternating current into direct current and output it to the energy storage device 100.

[0123] Specifically, the energy storage system 1000 includes a plurality of energy storage devices 100 of any one of the above items and the energy management system 301, and the energy management system 200 can realize the charge and discharge control of the plurality of energy storage devices 100. In the process of charging online, the energy management system 200 can control all energy storage devices 100 to be online and connected in parallel, and can also charge the energy storage devices 100 with low capacity and voltage first; in the process of discharging online, the energy management system 200 can control all energy storage devices 100 to be online and connected in parallel, and can also discharge the energy storage devices 100 with high capacity and voltage first.

[0124] The photovoltaic storage inverter system 300 is connected to each energy storage device 100 and establishes communication with the energy management system 200. When the energy storage system 1000 is working in the charging mode, the photovoltaic storage inverter system 300 receives the charging command of the energy management system 200, converts the input AC power into DC power and outputs it to each energy storage device 100; when the energy storage system 1000 is working in the discharging mode, the photovoltaic storage inverter system 300 receives the discharging command of the energy management system 200, converts the DC power output by each energy storage device 100 into AC power and outputs it to the power load or the power grid. In this way, the availability and flexibility of the energy storage system 1000 are improved.

[0125] The energy storage device 100, energy management system 200, and energy storage system 1000 of the present application can realize rapid shutdown of the energy storage device 100 in the event of a fault through the parallel control unit 150 and the fault monitoring unit 160 of the battery management system 120. The safety of all energy storage devices 100 can be guaranteed more quickly and reliably through the parallel management module 210 of the energy management system 200. When the energy storage device 100 is online, the risk of circulation between the energy storage devices 100 is eliminated, thereby improving the safety, availability, and flexibility of the energy storage system 1000.

[0126] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless there is any contradiction. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, unless otherwise clearly and specifically defined.

[0127] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that: include: Energy storage module; A battery management system, the battery management system comprising a charge and discharge monitoring unit, a parallel control unit and a charge and discharge switch, the charge and discharge switch is located in the power supply circuit of the energy storage module, and the parallel control unit is used to control the on and off of the charge and discharge switch; When a fault is detected, the battery management system sends a fault signal to the energy management system through the parallel control unit, so that the energy management system controls the parallel control units of all the energy storage devices to disconnect the charge and discharge switches.

2. The energy storage device according to claim 1, characterized in that: The battery management system also includes a fault monitoring unit, which is connected to the charge and discharge monitoring unit, and the charge and discharge monitoring unit is connected to the charge and discharge switch to collect charge and discharge information. The fault monitoring unit is used to obtain the charge and discharge information and perform fault detection based on the charge and discharge information to obtain a fault detection result, and the fault detection result includes whether the energy storage device has a fault.

3. The energy storage device according to claim 2, characterized in that: The fault monitoring unit is connected to the parallel control unit. When the fault detection result indicates that the energy storage device is faulty, the fault monitoring unit sends the fault signal to the parallel control unit, and the parallel control unit forwards the fault signal to the energy management system.

4. The energy storage device according to claim 2, characterized in that: The parallel control unit also includes a voltage pull-up circuit, which is arranged on a connection line between the fault monitoring unit and the parallel control unit. The voltage pull-up circuit is used to output a high level. The fault signal includes a charging fault signal and a discharging fault signal, and the fault signals are all low levels.

5. The energy storage device according to any one of claims 1 to 4, characterized in that: The charge and discharge switch includes a charge switch and a discharge switch, and the parallel control unit includes a charge control switch and a discharge control switch. The charge control switch is located on a charge enable circuit between the charge switch and the charge and discharge monitoring unit, and the charge control switch is used to control the on and off of the charge enable circuit. The discharge control switch is arranged on a discharge enable circuit between the discharge switch and the charge and discharge monitoring unit, and the discharge control switch is used to control the on and off of the discharge enable circuit.

6. The energy storage device according to claim 5, characterized in that: The energy management system generates a charging disconnection signal based on the charging fault signal, and generates a discharging disconnection signal based on the discharging fault signal; the charging control switch is connected to the energy management system through a charging control circuit, and the discharging control switch is connected to the energy management system through a discharging control circuit; The parallel control unit controls the charging control switch to be disconnected when receiving a charging disconnection signal sent by the energy management system through the charging control line; The parallel control unit controls the discharge control switch to be disconnected when receiving a discharge disconnection signal sent by the energy management system through the discharge control circuit; The parallel control unit controls the charging control switch to close when receiving a charging closing signal sent by the energy management system through the charging control line; The parallel control unit controls the discharge control switch to be closed when receiving the discharge closing signal sent by the energy management system through the discharge control line.

7. The energy storage device according to claim 5, characterized in that: The charge and discharge monitoring unit is used to generate a charge enable signal or a discharge enable signal. The charge switch is closed when receiving the charge enable signal; the discharge switch is closed when receiving the discharge enable signal.

8. The energy storage device according to claim 5, characterized in that: When the energy storage device is initialized online, the energy management system generates the charging disconnection signal and the discharging disconnection signal to control the charging control switch and the discharging control switch to be disconnected; The charge and discharge monitoring unit is used to generate a charge prohibition signal and a discharge prohibition signal to disconnect the charge switch and the discharge switch.

9. The energy storage device according to claim 1, characterized in that: The charge and discharge switch includes a charging switch, a charging diode, a discharging switch and a discharging diode. The charging switch and the charging diode are connected in parallel, and the conduction direction of the charging diode is opposite to the charging current direction of the energy storage module. The discharging switch and the discharging diode are connected in parallel, and the conduction direction of the discharging diode is opposite to the discharging current direction of the energy storage module.

10. The energy storage device according to claim 9, characterized in that: When the energy storage device is charged online, the charging switch is controlled to be turned on by the parallel control unit; When the charge and discharge monitoring unit detects that the charging current is greater than a preset threshold, the parallel control unit controls the discharge switch to be closed.

11. The energy storage device according to claim 9, characterized in that: When the energy storage device is discharged and online, the discharge switch is controlled to be turned on by the parallel control unit; When the charge and discharge monitoring unit detects that the discharge current is greater than a preset threshold, the parallel control unit controls the charging switch to be closed.

12. An energy management system, characterized in that: include: A parallel management module, wherein the parallel management module is connected to the parallel control units of each energy storage device; When receiving a fault signal sent by any of the parallel control units, the parallel management module controls the corresponding charge and discharge switches to be disconnected through the parallel control units of each of the energy storage devices.

13. The energy management system according to claim 12, characterized in that: The parallel management module includes a voltage pull-up unit, which includes a power supply, a resistor and a diode. The diode is located on a charge and discharge control circuit between the parallel control unit and the parallel management module, and the power supply is connected to the charge and discharge control circuit through the resistor.

14. An energy storage system, characterized in that: include: A plurality of energy storage devices according to any one of claims 1 to 11; The energy management system according to claim 12 or 13.

15. The energy storage system according to claim 14, characterized in that: It also includes a photovoltaic storage inverter system, which is connected to each of the energy storage devices. When the energy storage system operates in a discharge mode, the photovoltaic storage inverter system is used to convert the direct current output by the energy storage device into alternating current and output it. When the energy storage system operates in a charging mode, the photovoltaic storage inverter system is used to convert the input alternating current into direct current and output it to the energy storage device.

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