Energy storage device and energy storage system

Abstract

The utility model discloses an energy storage device and an energy storage system, and belongs to the technical field of energy storage control. The utility model provides an energy storage device, and the device comprises a centralized controller which is provided with an external communication interface, and achieves the communication between the energy storage device and an external device. The at least one energy storage converter is provided with a converter core controller which is in communication connection with the integrated controller; and the at least one battery cluster is correspondingly and electrically connected with the energy storage converter, the battery cluster comprises a plurality of battery packs, the battery packs are provided with battery management units, and the battery management units are configured to collect battery data and transmit the battery data to the centralized controller. According to the energy storage device, the energy storage device, the current conversion core controller in the energy storage device, the battery management unit and the like can all communicate with the integrated controller, the integrated controller can communicate with the external device through the external communication interface, the communication architecture is simplified, the communication efficiency is improved, and the energy storage device is more convenient to use. The number of external communication interfaces is reduced, and the cost is saved.

Description

Technical Field

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

[0002] In current energy storage products, an energy storage system usually includes at least one energy storage inverter and at least one battery cluster. The external interface ARM of each energy storage inverter supports network communication and has an independent IP address, which easily causes interface redundancy when communicating with external devices. In addition, CAN communication is usually used between the external interface ARM of the current string inverter and the core controller of the inverter. The upper limit of the CAN communication rate itself is 1Mb, so the fastest external communication speed of the core controller of the inverter is limited by CAN communication; and there are multiple energy storage inverters in a prefabricated cabin of the current string energy storage prefabricated cabin. When multiple inverters transmit information, they must be processed and forwarded by multiple layers of processors. The consistency of multiple energy storage inverters cannot be well synchronized due to the limitation of CAN communication rate, which leads to application bottlenecks. Utility Model Content

[0003] 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 and an energy storage system, which simplifies the communication architecture, improves the communication efficiency, and reduces the number of external communication interfaces.

[0004] In a first aspect, the present application provides an energy storage device, comprising:

[0005] A centralized controller, provided with an external communication interface, and configured to realize communication between the energy storage device and an external device based on the external communication interface;

[0006] At least one energy storage converter is provided with a converter core controller, and the converter core controller is communicatively connected with the centralized controller;

[0007] At least one battery cluster is electrically connected to the energy storage inverter. The battery cluster includes a plurality of battery packs. The battery packs are provided with a battery management unit. The battery management unit is configured to collect battery data and transmit the battery data to a centralized controller.

[0008] According to the energy storage device of the present application, the converter core controller, battery management unit, etc. in the energy storage device can communicate with the centralized controller, and the centralized controller can communicate with external devices through the external communication interface, thereby simplifying the communication architecture, improving communication efficiency, reducing the number of external communication interfaces, and saving costs.

[0009] According to an embodiment of the present application, the battery management unit is communicatively connected to the power conversion core controller, so that the battery data is transmitted to the centralized controller via the power conversion core controller.

[0010] According to one embodiment of the present application, the battery management unit and the converter core controller are connected in communication via an isolated serial peripheral interface.

[0011] According to an embodiment of the present application, each battery cluster includes a target battery management unit, and each target battery management unit is communicatively connected to each other and to the centralized controller, so that battery data is directly transmitted from the battery management unit to the centralized controller.

[0012] According to an embodiment of the present application, the battery cluster is provided with a battery monitor, the battery monitor is communicatively connected to the centralized controller, and the battery management unit is communicatively connected to the battery monitor, so that the battery data is transmitted to the centralized controller via the battery monitor.

[0013] According to one embodiment of the present application, the battery monitor and the centralized controller are connected to each other via a CAN bus or an Ethernet control automation bus.

[0014] According to one embodiment of the present application, the centralized controller includes: a power distribution unit, which is connected to each power conversion core controller and configured to receive a scheduling instruction, determine the response power of each energy storage converter according to the scheduling instruction, and transmit a power signal corresponding to the response power to each power conversion core controller.

[0015] According to one embodiment of the present application, the external device includes an electric energy management device, a scheduling device and / or a monitoring device.

[0016] According to one embodiment of the present application, the converter core controller and the centralized controller are connected in communication via an Ethernet control automation bus.

[0017] According to one embodiment of the present application, the energy storage device also includes a fire protection system and a thermal management system. The fire protection system is connected to the centralized controller via an I / O or RS485 interface, and the thermal management system is connected to the centralized controller via an RS485 interface.

[0018] According to one embodiment of the present application, the external communication interface is an RJ45 interface.

[0019] According to one embodiment of the present application, the energy storage device is an energy storage container.

[0020] In a second aspect, the present application provides an energy storage system, which includes the above-mentioned energy storage device. Additional aspects and advantages of the present application will be partially given in the following description, and partially will become obvious from the following description, or will be understood through the practice of the present application.

[0021] According to the energy storage system of the present application, the converter core controller, battery management unit, etc. in the energy storage device can communicate with the centralized controller, and the centralized controller can communicate with external devices through the external communication interface, thereby simplifying the communication architecture, improving communication efficiency, reducing the number of external communication interfaces, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a structural schematic diagram of an energy storage device in the related art;

[0024] Figure 2 It is one of the structural schematic diagrams of the energy storage device provided in the embodiment of the present application;

[0025] Figure 3 This is the second structural schematic diagram of the energy storage device provided in the embodiment of the present application;

[0026] Figure 4 This is the third structural schematic diagram of the energy storage device provided in the embodiment of the present application.

[0027] Reference numerals:

[0028] Energy storage device 100 , centralized controller 110 , energy storage converter 120 , battery cluster 130 , battery pack 131 , battery management unit 1311 , converter core controller 140 , battery monitor 150 , fire protection system 160 , thermal management system 170 . DETAILED DESCRIPTION

[0029] 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.

[0030] In the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "coupled to" or "connected to" another element or an element / circuit is said to be "coupled to" or "connected to" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between the elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0031] In the description, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the numerical descriptors used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0032] In addition, descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example 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.

[0033] like Figure 1 As shown, in the related art, each energy storage product includes a BSC (main management unit) to control the operating status of the entire energy storage device. Each energy storage product also includes a BMU (battery management unit) board to collect the cell voltage and temperature and transmit the data to the CMU (battery monitoring unit). A PCS (energy storage inverter) includes a DSP (inverter core control unit), an ARM board and a CMU (battery monitoring unit), wherein an ARM board and a CMU form a minimum unit to enable the energy storage device to communicate with the outside world. However, energy storage products usually include multiple energy storage inverters, and therefore have multiple minimum units, and the communication architecture is relatively complex.

[0034] An embodiment of the present application proposes an energy storage device, in which a centralized controller 110 is provided. The centralized controller 110 integrates the communication functions of all minimum units. The energy storage device can communicate with the outside only through the centralized controller 110, thereby simplifying the communication architecture.

[0035] like Figure 2As shown, an embodiment of the present application proposes an energy storage device 100, which includes: a centralized controller 110, at least one energy storage converter 120, and at least one battery cluster 130. The centralized controller 110 is provided with an external communication interface, and is configured to realize communication between the energy storage device 100 and an external device based on the external communication interface; the energy storage converter 120 is provided with a converter core controller 140, and the converter core controller 140 is communicatively connected to the centralized controller 110; the battery cluster 130 is electrically connected to the energy storage converter 120, and the battery cluster 130 includes a plurality of battery packs 131, and the battery packs 131 are provided with a battery management unit 1311, and the battery management unit 1311 is configured to collect battery data and transmit the battery data to the centralized controller 110.

[0036] The centralized controller 110 is mainly used to realize the communication between the energy storage device 100 and the external device. The centralized controller 110 can calculate the response power of each converter module in the energy storage device 100 in real time according to the scheduling instructions and the battery status, and coordinate the unified action of multiple converter modules in the energy storage device 100 through the high-speed data bus, and cooperate at high speed; it presents integrity to the outside. In addition, the centralized controller 110 is a unified interface for human-computer interaction of the energy storage device 100. The operating status information of each converter module and the operating status information of each battery pack can be viewed through the centralized controller 110. The power on / off and operating power of each converter module can be set independently, and the unified operating power and power on / off information of the energy storage device 100 can also be set. The centralized controller 110 can also upgrade the program for each converter module, and can also upgrade the program for each battery cluster or battery pack.

[0037] The centralized controller 110 has functions such as data collection and transmission and human-computer interaction, and the centralized controller 110 is provided with an external communication interface and various types of internal communication interfaces, wherein the external communication interface may be an RJ45 interface, a Modbus interface, an OPC UA interface, etc. The centralized controller 110 communicates with external devices such as a host computer through the external interface. The centralized controller 110 may receive instructions from the host computer through the communication interface, and may also transmit various data in the energy storage device to the host computer; the internal communication interface may be an I / O interface, a CAN communication interface, an RS485 communication interface, etc., to realize data collection and operation status control of modules such as the battery system and the fire protection system inside the energy storage device.

[0038] The energy storage converter 120 is mainly used to realize power conversion and energy transfer between the battery pack and the power grid, and to convert AC power into DC power. In the absence of a power grid, it can directly supply power to AC loads.

[0039] The converter core controller 140 is mainly used to control the operating status of each switch tube and component inside the energy storage converter 120. Each converter core controller 140 is connected in a hand-in-hand manner, and is connected to the centralized controller 110 through a converter core controller 140. The converter core controller 140 uploads the operating status of each switch tube and component to the centralized controller in real time, and the centralized controller 110 sends a signal to the converter core controller 140 to turn on or off each switch tube and component. The IP configuration can be omitted through the algorithm, and each converter core controller 140 no longer uses the IP address as an identification method for external device access. The entire energy storage device 100 has only one IP address, the centralized controller 110, and the configuration work is completely omitted. The software automatically identifies the overall communication architecture, which greatly simplifies the debugging and operation work.

[0040] The battery pack 131 may include multiple battery cells or battery cell groups and a battery management unit 1311. The battery cluster 130 includes multiple battery packs 131. The battery cluster 130 is mainly used to provide power for the energy storage device 100. The battery packs 131 in each battery cluster 130 are connected in sequence. The battery management unit 1311 can be used to collect current, voltage, temperature and other related data in each battery pack 131, and communicate with the centralized controller 110 to upload the collected current, voltage, temperature and other related data to the centralized controller 110 in real time.

[0041] According to the energy storage device 100 of the present application, the converter core controller 140, the battery management unit 1311, etc. in the energy storage device 100 can communicate with the centralized controller 110, and the centralized controller 110 can communicate with external devices through an external communication interface, thereby simplifying the communication architecture, improving communication efficiency, reducing the number of external communication interfaces, and saving costs.

[0042] Continue to refer to Figure 2 In some embodiments, the battery management unit 1311 is in communication with the power conversion core controller 140 , so that the battery data is transmitted to the central controller 110 via the power conversion core controller 140 .

[0043] The battery management units 1311 in a battery cluster 130 communicate with each other using a daisy chain communication architecture, and the battery management unit 1311 in each battery cluster 130 is correspondingly connected to a power conversion core controller 140 for the power conversion core controller 140 to collect the battery information collected by the battery management unit 1311. The power conversion core controller 140 can communicate with the centralized controller 110 to transmit the battery information collected by the battery management unit 1311 to the centralized controller 110.

[0044] Continue to refer to Figure 2In some embodiments, the battery management unit 1311 and the converter core controller 140 are connected using an isolated serial peripheral interface communication (isoSPI).

[0045] Isolated serial peripheral interface communication mainly uses isolation devices to separate communication signals between circuits to achieve isolation and stabilize data transmission, which can promote the collaboration between the battery management unit 1311 and the power conversion core controller 140 and improve the communication performance and security between the battery management unit 1311 and the power conversion core controller 140.

[0046] In some embodiments, the battery management units 1311 in a battery cluster 130 may also be connected to each other via an isolated serial peripheral interface to reduce interference between the battery management units 1311 or from other circuits or the external environment, thereby ensuring stability and accuracy of data transmission.

[0047] like Figure 3 As shown, in some embodiments, each battery cluster 130 includes a target battery management unit, and each target battery management unit is communicatively connected to each other and to the centralized controller 110, so that battery data is directly transmitted from the battery management unit 1311 to the centralized controller 110.

[0048] The battery management units 1311 in a battery cluster 130 communicate with each other using a daisy chain communication architecture. The battery management unit 1311 at the head or end of the communication chain can be selected as the target battery management unit. Each target battery management unit can be connected via an isolated serial peripheral interface communication and directly connected to the centralized controller 110, thereby simplifying the communication architecture and enabling battery data to be directly transmitted from the battery management unit 1311 to the centralized controller 110.

[0049] A plurality of target battery management units may also be provided in one battery cluster 130 . The number of target battery management units is not limited here, as long as the battery management units 1311 of different battery clusters can communicate with each other.

[0050] like Figure 4 As shown, in some embodiments, the battery cluster 130 is provided with a battery monitor 150 , which is communicatively connected to the centralized controller 110 , and the battery management unit 1311 is communicatively connected to the battery monitor 150 , so that the battery data is transmitted to the centralized controller 110 via the battery monitor 150 .

[0051] Each battery cluster 130 is provided with a corresponding battery monitor 150. The battery management unit 1311 in each battery cluster 130 can be connected to the corresponding battery monitor 150 by using the above-mentioned isolated serial peripheral interface communication, so as to realize the real-time monitoring of the voltage, current, temperature and other parameters collected by the battery management unit 1311 by the battery monitor 150, and improve the communication performance and security between the battery management units 1311, so as to ensure that the energy storage device 100 can manage energy safely and effectively.

[0052] Each battery monitor 150 can communicate with the centralized controller 110 through a communication protocol, receive instructions from the centralized controller 110 and send monitored real-time data.

[0053] In some embodiments, the battery monitor 150 and the centralized controller 110 are connected to each other via a CAN bus or an Ethernet Control Automation (EtherCAT) bus.

[0054] The CAN bus adopts a serial communication method, and uses the voltage difference between two wires (CAN_H and CAN_L) to transmit data using differential signals, which can reduce electromagnetic interference between communication lines. The CAN bus can connect multiple communication modules at the same time, facilitating communication between multiple battery monitors 150 and the centralized controller 110 in this application.

[0055] The Ethernet control automation bus uses distributed clock synchronization technology to ensure that each device in the network has the same time reference, and adopts a real-time communication protocol, so that the centralized controller 110 can receive the battery data detected by the battery monitor 150 in real time.

[0056] In some embodiments, the centralized controller includes: a power distribution unit, which is connected to each converter core controller and configured to receive scheduling instructions, determine the response power of each energy storage converter according to the scheduling instructions, and transmit the power signal corresponding to the response power to each converter core controller.

[0057] After receiving the dispatch instruction, the power distribution unit calculates the response power of each energy storage inverter in the energy storage device in real time, and transmits the corresponding power signal to each inverter core controller through the bus. Each inverter core controller controls the corresponding energy storage inverter according to the power signal, thereby realizing the coordinated control of each energy storage inverter by the centralized controller and presenting integrity to the outside.

[0058] In some embodiments, the external device includes a power management device, a scheduling device, and / or a monitoring device.

[0059] The power management device is mainly responsible for formulating corresponding control strategies according to the external environment of the energy storage device to control the operating status of each module in the energy storage device. The dispatching device can issue dispatching instructions to the centralized controller. The monitoring device can monitor the operating status of each module in the energy storage device in real time and upload an alarm signal to the centralized controller when a module fails.

[0060] like Figure 2 and Figure 3 As shown, in some embodiments, the inverter core controller 140 and the central controller 110 are connected to each other via an Ethernet control automation bus.

[0061] The Ethernet control automation bus adopts a real-time communication protocol and has a fast bus rate, which can meet the requirements of centralized and fast communication of multiple energy storage inverters 120. The Ethernet control automation bus uses distributed time division multiplexing technology to achieve fast serial data transmission through an Ethernet cable, reducing communication delays and enabling efficient data exchange and control command transmission in the energy storage device 100.

[0062] It should be noted that the above-mentioned converter core controller 140 communicates with the central controller 110 via the Ethernet control automation bus only as an example. The communication method between the converter core controller 140 and the central controller 110 is not limited here, as long as the purpose of simplifying the communication architecture can be met.

[0063] Continue to refer to Figure 2 and Figure 3 In some embodiments, the energy storage device 100 further includes a fire protection system (FFS) 160 and a thermal management system (TMS) 170. The fire protection system 160 is connected to the centralized controller 110 via an I / O or RS485 interface, and the thermal management system 170 is connected to the centralized controller 110 via an RS485 interface.

[0064] RS485 interface communication is a serial communication interface commonly used for long-distance data transmission. It uses differential signal transmission and can achieve reliable communication over longer distances.

[0065] The I / O interface communication can realize the data collection of the energy storage device 100 and the remote control of the energy storage device 100, including operations such as starting, stopping, and adjusting the charge and discharge rate.

[0066] The fire protection system 160 may include fire detectors and fire extinguishing equipment. The fire detectors are used to monitor temperature, smoke or other signs of fire. When an abnormality is detected, the abnormal signal is quickly transmitted to the centralized controller 110 through I / O or RS485 interface communication. The centralized controller 110 controls the fire extinguishing equipment to start and take fire extinguishing measures to minimize the damage caused by the fire to the energy storage device 100.

[0067] The thermal management system 170 in the energy storage device 100 mainly transmits the temperature of the energy storage device to the centralized controller 110 through RS485 interface communication. The centralized controller 110 controls the thermal management system 170 to adjust the temperature of the energy storage device to ensure efficient operation and service life of the energy storage device 100.

[0068] Continue to refer to Figure 2 and 3 In some embodiments, the external communication interface is an RJ45 interface.

[0069] The RJ45 interface is usually connected to four twisted pairs to transmit signals. One of each pair of wires is positive polarity and the other is negative polarity. The data in the centralized controller 110 is transmitted through the four twisted pairs, using magnetic change or current change to transmit data, and finally reaches the external device of the energy storage device 100. This configuration helps to reduce electromagnetic interference and improve the reliability of data transmission.

[0070] In some embodiments, the energy storage device 100 is an energy storage container.

[0071] The energy storage container integrates the above-mentioned centralized controller 110, at least one energy storage inverter 120, at least one battery cluster 130, a fire protection system 160 and a thermal management system 170. The communication architecture between the units in the energy storage container can refer to the above-mentioned embodiment and will not be repeated here.

[0072] An embodiment of the present application provides an energy storage system, which includes the above-mentioned energy storage device 100.

[0073] The energy storage device 100 in the energy storage system can implement the technical solutions in the aforementioned examples to simplify the communication architecture of the energy storage system and reduce the number of external communication interfaces, which will not be described in detail here.

[0074] According to the energy storage system of the present application, the converter core controller 140, the battery management unit 1311, etc. in the energy storage device 100 can communicate with the centralized controller 110, and the centralized controller 110 can communicate with external devices through an external communication interface, thereby simplifying the communication architecture, improving communication efficiency, reducing the number of external communication interfaces, and saving costs.

[0075] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that: The energy storage device comprises: A centralized controller, provided with an external communication interface, and configured to realize communication between the energy storage device and an external device based on the external communication interface; At least one energy storage converter is provided with a converter core controller, and the converter core controller is communicatively connected with the centralized controller; At least one battery cluster is electrically connected to the energy storage inverter, the battery cluster includes at least one battery pack, the battery pack is provided with a battery management unit, and the battery management unit is configured to collect battery data and transmit the battery data to the centralized controller.

2. The energy storage device according to claim 1, characterized in that: The battery management unit is in communication connection with the power conversion core controller, so that the battery data is transmitted to the centralized controller via the power conversion core controller.

3. The energy storage device according to claim 2, characterized in that: The battery management unit and the converter core controller are connected in communication via an isolated serial peripheral interface.

4. The energy storage device according to claim 1, characterized in that: Each of the battery clusters includes a target battery management unit, and each of the target battery management units is communicatively connected to each other and is communicatively connected to the centralized controller, so that the battery data is directly transmitted from the battery management unit to the centralized controller.

5. The energy storage device according to claim 1, characterized in that: The battery cluster is provided with a battery monitor, and the battery monitor is communicatively connected to the centralized controller. The battery management unit is communicatively connected to the battery monitor, so that the battery data is transmitted to the centralized controller via the battery monitor.

6. The energy storage device according to claim 5, characterized in that: The battery monitor and the centralized controller are connected by CAN bus or Ethernet control automation bus communication.

7. The energy storage device according to any one of claims 1 to 6, characterized in that: The centralized controller comprises: The power distribution unit is connected to each of the converter core controllers and is configured to receive a scheduling instruction, determine a response power of each of the energy storage converters according to the scheduling instruction, and transmit a power signal corresponding to the response power to each of the converter core controllers.

8. The energy storage device according to any one of claims 1 to 6, characterized in that: The external device includes an electric energy management device, a scheduling device and / or a monitoring device.

9. The energy storage device according to any one of claims 1 to 6, characterized in that: The converter core controller and the centralized controller are connected by an Ethernet control automation bus communication.

10. The energy storage device according to any one of claims 1 to 6, characterized in that: The energy storage device also includes a fire protection system and a thermal management system; The fire protection system is connected to the centralized controller by I / O or RS485 interface communication, and the thermal management system is connected to the centralized controller by RS485 interface communication; or, The fire protection system and the thermal management system are communicatively connected with the centralized controller via a bus.

11. The energy storage device according to any one of claims 1 to 6, characterized in that: The external communication interface is an RJ45 interface.

12. The energy storage device according to any one of claims 1 to 6, characterized in that: The energy storage device is an energy storage container.

13. An energy storage system, characterized in that: The energy storage system comprises an energy storage device according to any one of claims 1-12.

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