Energy storage box and energy storage system

Abstract

The invention relates to an energy storage box and an energy storage system, and belongs to the technical field of electronic power. The energy storage box comprises a box body, wherein the interior of the box body comprises a first cabin and a second cabin; the plurality of battery clusters are arranged in the first cabin, and each battery cluster comprises a high-voltage box and a plurality of battery assemblies connected in series between the positive input end and the negative input end of the high-voltage box; the plurality of energy storage converters are in one-to-one correspondence with the plurality of battery clusters and are arranged in the second cabin, and a direct-current electric energy input port of each energy storage converter is connected with an output port of the high-voltage box of the corresponding battery cluster; the confluence module is arranged in the second cabin and is respectively connected with the alternating current electric energy output port of each energy storage converter and the alternating current output port of the energy storage box; the first communication terminal of the control module is connected with the communication end of the controller of each energy storage converter, and the second communication terminal of the control module is connected with the communication end of the controller of the high-voltage box of each battery cluster. The application can help to reduce the circulation generated between different battery packs in the energy storage system.

Description

Technical Field

[0001] The present application relates to the field of electronic power technology, and in particular to an energy storage box and an energy storage system. Background Art

[0002] Energy storage system, that is, power system that mainly uses batteries and other energy storage components to store electrical energy, can include batteries, battery management systems, energy management systems and energy storage inverters. Among them, the battery management system is mainly responsible for battery monitoring, evaluation, protection and balancing, the energy management system is mainly responsible for data acquisition, network monitoring and energy scheduling, and the energy storage inverter is used to control the charging and discharging process of the energy storage battery pack and the conversion between AC and DC. In practical applications, the various components of the energy storage system can be placed in the internal space of a box-type structure such as a container, and the required connections are formed through appropriate cables and interfaces.

[0003] In current energy storage systems, a system architecture is usually adopted in which the output ends of multiple battery packs are DC-coupled together and connected to a single centralized energy storage inverter. In such a system architecture, different battery packs may form a circulating current (i.e., an abnormal current flowing from one battery pack to another) due to different battery temperatures, differences in battery self-discharge, differences in battery performance attenuation, etc., which will impact the components in the battery pack and may cause thermal runaway, short circuit and fire, seriously affecting the safety of the energy storage system. Summary of the invention

[0004] The present application provides an energy storage box and an energy storage system, which can help reduce the circulating current generated between different battery groups in the energy storage system.

[0005] The present application provides an energy storage box, the energy storage box comprising:

[0006] A box body, wherein the interior of the box body includes a first cabin and a second cabin;

[0007] A plurality of battery clusters, the plurality of battery clusters being arranged in the first compartment, each of the battery clusters comprising a high voltage box and a plurality of battery assemblies connected in series between a positive input terminal and a negative input terminal of the high voltage box;

[0008] A plurality of energy storage converters corresponding to the plurality of battery clusters one by one, the plurality of energy storage converters being arranged in the second compartment, and a DC power input port of each of the energy storage converters being connected to an output port of a high-voltage box of the corresponding battery cluster;

[0009] A confluence module, which is arranged in the second compartment and is respectively connected to the AC power output port of each of the energy storage converters and the AC output port of the energy storage box;

[0010] A control module is arranged in the second compartment, the first communication terminal of the control module is respectively connected to the communication end of the controller of each energy storage inverter, and the second communication terminal of the control module is respectively connected to the communication end of the controller of the high-voltage box of each battery cluster.

[0011] In some possible implementations, the energy storage box also includes a first switch and a second switch, the first communication terminal of the control module is respectively connected to the communication end of the controller of each of the energy storage inverters through the first switch, and the second communication terminal of the control module is respectively connected to the communication end of the controller of the high-voltage box of each battery cluster through the second switch.

[0012] In some possible implementations, the controller of each of the energy storage inverters also has a bus connection terminal, and the controller of each of the high-voltage boxes of the battery cluster also has a first bus connection terminal, and the bus connection terminal of the controller of each of the energy storage inverters is connected to the first bus connection terminal of the controller of the high-voltage box of the corresponding battery cluster.

[0013] In some possible implementations, the controller of the high voltage box of each battery cluster also has a second bus connection terminal, and the second bus connection terminal of the controller of the high voltage box of each battery cluster is respectively connected to the bus connection terminal of the controller of each battery assembly in the battery cluster.

[0014] In some possible implementations, the energy storage converter is configured to output an AC signal with a voltage amplitude of 400V at the AC output port.

[0015] In some possible implementations, the convergence module includes a first switch and a plurality of second switches corresponding one-to-one to the plurality of energy storage inverters, wherein the first switch is connected between the AC output port of the energy storage box and a first node, and each of the second switches is connected between the first node and the AC power output port of the corresponding energy storage inverter.

[0016] In some possible implementations, the control module is respectively connected to the first switch and each of the second switches to respectively control the switch states of the first switch and each of the second switches.

[0017] In some possible implementations, the first compartment includes a plurality of sub-compartments arranged along a first direction, each of the battery clusters is disposed in a sub-compartment corresponding to the battery cluster, and the plurality of battery assemblies and the high-voltage box in each of the battery clusters are sequentially arranged along a second direction, the first direction is a direction parallel to the bottom surface of the energy storage box, and the second direction is a direction from the top surface of the energy storage box to the bottom surface of the energy storage box;

[0018] The second cabin is located on one side of the first cabin in the first direction, and the second cabin includes a control room, a power distribution cabinet, a junction cabinet and a cold cabinet. The multiple energy storage inverters and the control module are arranged in the control room, and the junction module is arranged in the junction cabinet. The power distribution cabinet, the junction cabinet and the cold cabinet are arranged in sequence along the second direction on the side of the control room away from the first cabin. The energy storage box also includes: at least one electric meter arranged in the power distribution cabinet, a liquid cooler arranged in the cold cabinet and a fire protection system arranged in the control room, and the control module is respectively connected to the measurement signal output end of each electric meter, the control end of the liquid cooler and the control end of the fire protection system.

[0019] The present application also provides an energy storage device, which includes any one of the above-mentioned energy storage boxes.

[0020] In some possible implementations, the energy storage system further includes a boost box, in which a transformer is provided, an input port of the transformer is connected to an AC output port of the energy storage box, and an output port of the transformer is connected to an output port of the boost box.

[0021] In the energy storage box of the embodiment of the present application, each battery cluster is respectively connected to a different energy storage inverter, and the AC signals output by different energy storage inverters are converged and output by the convergence module; at the same time, the control module is respectively communicated with the controller of each energy storage inverter and the controller of the high-voltage box of each battery cluster, so that the energy balancing management between different battery clusters can be realized quickly and stably; in this way, not only there is no direct DC power path between different battery clusters, but the control module can also perform balancing control on different energy storage inverters to avoid different battery clusters from exchanging energy through their respective energy storage inverters, thereby being able to greatly reduce the circulating current generated between different battery groups, helping to improve the safety and reliability of the energy storage system.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 It is a schematic diagram of the internal structure of an energy storage box provided in an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the internal circuit connection relationship of an energy storage box provided in an embodiment of the present application;

[0026] Figure 3This is a schematic diagram of the circuit structure of an energy storage system in a comparative example of the present application;

[0027] Figure 4 It is a structural schematic diagram of an energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0029] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0030] Figure 1 Schematic diagram of the internal structure of an energy storage box provided in an embodiment of the present application. Figure 1 The energy storage box includes a box body 10, and the interior of the box body 10 includes a first compartment 11 and a second compartment 12. It should be noted that the compartments described herein refer to different blocks divided inside the box body, and a compartment may include only a single accommodating space or multiple accommodating spaces. As an example, Figure 1 As shown, the first compartment 11 includes a first sub-compartment 111 and a second sub-compartment 112 .

[0031] See also Figure 1 The energy storage box also includes a plurality of battery clusters 21 arranged in the first compartment 11 (as an example, three battery clusters 21 are arranged in the first sub-compartment 111, and two battery clusters 21 are arranged in the second sub-compartment 112) and a plurality of energy storage converters PCS arranged in the second compartment 12, wherein each battery cluster 21 includes a high-voltage box HVB and a plurality of battery assemblies BU, and the plurality of energy storage converters PCS correspond to the plurality of battery clusters 21 one by one. As an example, Figure 1As shown, the second cabin 12 includes a control room 121, a power distribution cabinet PB, a junction cabinet TB and a cold cabinet CB. Multiple energy storage converters PCS and a fire protection system FS of the energy storage box are arranged in the control room 121. The energy storage box also includes a junction module arranged in the junction cabinet TB. It should be noted that Figure 1 The approximate positions and arrangements of the installed components inside the box 10 are shown by way of example; the blank portion may include a supporting structure such as a plate, a frame or a frame to enable the installation of the components at the designated positions inside the box 10; in addition, for the sake of clarity, Figure 1 The connection lines between the various components are hidden.

[0032] Figure 2 Schematic diagram of the internal circuit connection relationship of an energy storage box provided in an embodiment of the present application. Figure 2 In each battery cluster 21, all battery assemblies BU are connected in series between the positive input terminal A1 and the negative input terminal A0 of the high-voltage box HVB, so that all battery assemblies BU provide DC power between the positive input terminal A1 and the negative input terminal A0 of the high-voltage box HVB.

[0033] See also Figure 2 , the DC power input port of each energy storage converter PCS ( Figure 2 The two connection terminals below the energy storage converter PCS are used as an example) to connect the output ports ( Figure 2 The positive output terminal B1 and the negative output terminal B0 are used as examples), so that the high-voltage box HVB can input the DC power from the battery assembly BU into the corresponding energy storage inverter PCS, and the energy storage inverter PCS converts it into AC power and then outputs it from its AC power output port.

[0034] See also Figure 2 In one example, the bus module in the bus cabinet TB includes a first switch K1 and a plurality of second switches K2 corresponding to the plurality of energy storage converters PCS, the first switch K1 is connected between the AC output port OUT of the energy storage box and the first node P1, and each second switch K2 is connected between the first node P1 and the AC power output port ( Figure 2In this way, when the first switch K1 and each second switch K2 are in a closed state, the AC power output by all the energy storage converters PCS can be combined and output to the AC output port OUT. In other implementations, the AC power output port of the energy storage converter PCS may include multiple AC output terminals (for example, three AC output terminals corresponding to three-phase AC power and one AC output terminal corresponding to the zero-line voltage). As an example, at this time, the same type of AC output terminals of each energy storage converter PCS can be connected to a confluence node through a sub-switch of the second switch K2, and the confluence node can be connected to an output terminal of a corresponding type of the AC output port OUT of the energy storage box through a sub-switch of the first switch K1, thereby in accordance with Figure 2 The convergence of AC signals is realized in a similar manner. In other possible implementations, the above-mentioned convergence module (the convergence module is respectively connected to the AC power output port of each energy storage converter and the AC output port of the energy storage box to realize the convergence of the AC power output of multiple energy storage converters PCS) can also be realized by referring to the circuit structure with convergence function in the related art, which will not be described one by one here.

[0035] In addition, see Figure 2 The energy storage box also includes a control module EMS (arranged in the second compartment, not in the Figure 1 As shown in the figure, the first communication terminal CM1 of the control module EMS is respectively connected to the communication terminal LN of the controller of each energy storage inverter PCS, and the second communication terminal CM2 of the control module EMS is respectively connected to the communication terminal of the controller BCU of the high-voltage box HVB of each battery cluster 21, so that the control module EMS can communicate with each energy storage inverter PCS, and the control module EMS can also communicate with the controller BCU of the high-voltage box HVB of each battery cluster 21.

[0036] As an example, see Figure 2 The energy storage box also includes a first switch ES1 and a second switch ES2 (for example, arranged in the control room 121), the first communication terminal CM1 of the control module EMS is connected to the communication terminal LN of the controller of each energy storage converter PCS through the first switch ES1, and the second communication terminal CM2 of the control module EMS is connected to the communication terminal BCU of the controller of the high-voltage box HVB of each battery cluster 21 through the second switch ES2 ( Figure 2 In addition, the bus connection terminal CN of the controller of each energy storage converter PCS is connected to the first bus connection terminal ( Figure 21. The connection terminal on the upper right of the controller BCU of each high-voltage box HVB in the embodiment of the present invention. For example, Figure 2 In the embodiment, the first end of the first switch ES1 is connected to the first-stage energy storage converter PCS (i.e. Figure 2 The second end of the first switch ES1 is connected to each of the other energy storage converters PCS, the third end of the first switch ES1 is connected to the first communication terminal CM1 of the control module EMS, and the first end of the second switch ES2 is connected to the first battery cluster 21 (i.e. Figure 2 The second end of the second switch ES2 is connected to the leftmost battery cluster 21, the second end of the second switch ES2 is connected to each other level of battery cluster 21, and the third end of the second switch ES2 is connected to the second communication terminal CM2 of the control module EMS, so that the control module EMS can communicate with each energy storage converter PCS and the controller BCU of the high-voltage box HVB of each battery cluster 21. In other possible implementations, other methods can also be used to achieve the required communication connection, such as multiple ends of the switch are respectively connected to each energy storage converter PCS or each battery cluster 21, so as to achieve more efficient data communication.

[0037] It can be seen that in the energy storage box of the embodiment of the present application, each battery cluster 21 is respectively connected to a different energy storage inverter PSC, and the AC signals output by different energy storage inverters PSC are converged and output by the convergence module; at the same time, the control module EMS is respectively communicated with the controller of each energy storage inverter PSC and the controller BCU of the high-voltage box HVB of each battery cluster 21, and can quickly and stably realize the energy balancing management between different battery clusters 21; in this way, not only there is no direct DC path between different battery clusters 21, but the control module EMS can also perform balancing control between different energy storage inverters PSC to avoid the situation where different battery clusters 21 exchange energy through their respective energy storage inverters PSC, thereby being able to greatly reduce the circulating current generated between different battery groups in the energy storage system with multiple battery groups, helping to improve the safety and reliability of the energy storage system.

[0038] Figure 3 Schematic diagram of the circuit structure of an energy storage system in a comparative example of the present application. Figure 2The difference is that the energy storage system of the comparative example has only one energy storage converter PSC, and the positive output terminal B1 of each battery cluster composed of a high-voltage box HVB and a plurality of battery assemblies BU is connected to the positive input terminal of the energy storage converter PSC, and the negative output terminal B0 of each battery cluster composed of a high-voltage box HVB and a plurality of battery assemblies BU is connected to the negative input terminal of the energy storage converter PSC, so that all battery clusters provide DC power to the energy storage converter PSC in a DC coupling (parallel) manner; and the bus connection terminal of the energy storage converter PSC is only connected to the first battery The controller BCU of the high-voltage box HVB of the cluster is connected, and the communication connection between the controllers BCU of two high-voltage boxes HVB is realized by the inter-cluster connection between adjacent battery clusters, so that the controller BCU of the high-voltage box HVB of the first battery cluster is used as the main controller, and the controllers BCU of the high-voltage boxes HVB of other battery clusters are used as slave controllers. The energy storage inverter PSC sends a control instruction with a battery cluster identifier to the main controller, and the main controller executes the control instruction corresponding to the battery cluster identifier and itself, or forwards the control instruction step by step to the slave controller corresponding to the battery cluster identifier for execution.

[0039] It can be seen that Figure 3 In the comparative example shown, the positive output terminals B1 of different battery clusters are directly connected, and the negative output terminals B0 of different battery clusters are directly connected, which makes a direct DC path exist between different battery clusters. It is easy to form a circulation (i.e., an abnormal current flowing from one battery cluster to another) due to different battery temperatures, battery self-discharge differences, battery performance attenuation differences, etc., which will impact the internal components of the battery cluster and affect their service life; moreover, since the energy storage converter PSC sends control instructions to the controller BCU of the high-voltage box HVB of each battery cluster, a single energy storage converter PSC is required to handle the distribution of all control instructions, and it involves the step-by-step transmission of control instructions between battery clusters and the addressing judgment of control instructions (there is a risk of communication loss due to external environmental interference), so the delay of the entire control process is very large, and it is difficult to control the level of inter-cluster circulation within a stable and safe range; in addition, once a single energy storage converter PSC itself fails or communication is interrupted, the operation of the entire energy storage system will be interrupted or greatly affected, affecting the stability and reliability of the energy storage system.

[0040] In comparison, Figure 1 and Figure 2In the embodiment of the present application shown, each battery cluster 21 is respectively connected to a different energy storage inverter PSC, and the AC signals output by different energy storage inverters PSC are merged and output by the merge module in the merge box TB, and there is no direct DC path between different battery clusters 21; moreover, the control module EMS is respectively communicated with the controller of each energy storage inverter PSC and the controller BCU of the high-voltage box HVB of each battery cluster 21, and the power balancing control of different battery clusters 21 is directly performed on the AC side (that is, each energy storage inverter PSC is controlled to output the same AC signal), and it is almost impossible for different battery clusters 21 to exchange power through their respective energy storage inverters PSC, which greatly reduces the formation of inter-cluster circulation, which can not only reduce the current impact on internal components, but also significantly improve the AC-DC conversion efficiency in the energy storage system, which helps to improve the overall performance of the energy storage system. Moreover, compared with the comparative example, there is no inter-cluster connection between adjacent battery clusters in the embodiment of the present application, that is, the controller BCU of the high-voltage box HVB of each battery cluster 21 works independently without affecting each other, so that the stability of the entire energy storage system is better. In addition, since each energy storage converter PSC independently controls its corresponding battery cluster 21, and each energy storage converter PSC is directly controlled by the control module EMS, the control strategy on each energy storage converter PSC can be consistent and simpler, which not only has higher communication efficiency and better stability, but also is easier to expand and integrate to achieve a larger-scale energy storage system.

[0041] See also Figure 2 In one example, each battery assembly BU includes a controller BMU and a battery BT, and the batteries BT in each battery cluster 21 are connected in series step by step (the positive electrode V1 of the battery BT of the first-stage battery assembly BU is connected to the positive input terminal A1 of the high-voltage box HVB, the positive electrode V1 of the battery BT of each battery assembly BU except the first stage is connected to the negative electrode V0 of the battery BT of the previous-stage battery assembly BU, and the negative electrode V0 of the battery BT of the last-stage battery assembly BU is connected to the negative input terminal A0 of the high-voltage box HVB); the second bus connection terminal ( Figure 2 The connection end on the left side of the controller BCU in the middle) is respectively connected to the bus connection end of the controller of each battery unit BU in the battery cluster 21. In some possible implementations, the controller BMU of the battery unit BU is used to implement at least one of the following functions: collection and reporting of battery operation data (such as battery output voltage, battery output current, battery temperature, etc.) (such as reporting to the energy storage converter PCS and control module EMS through the controller BCU of the high-voltage box HVB), execution of control instructions from the controller BCU of the high-voltage box HVB, switch state control of the internal switch of the battery unit BU, overvoltage protection, undervoltage protection, overheating protection, and fault diagnosis.

[0042] See also Figure 2 In one example, each high-voltage box HVB includes a controller BCU and an interface circuit CT connected thereto; the interface circuit CT is used to transmit the DC power output by the multiple battery assemblies BU to the energy storage converter PCS, which may include one or more switching elements (such as transistors, relays, photocouplers, etc.), and may be used to implement at least one of the functions of on-off control, filtering, current limiting, rectification, etc. In some possible implementations, Figure 2 The controller BCU of each high-voltage box HVB is used to implement at least one of the following functions: collection and reporting of battery cluster operation data (such as battery cluster output voltage, battery cluster output current, battery cluster temperature, state of charge SOC, state of health SOH, etc.) (such as reporting to the energy storage converter PCS and control module EMS), execution of control instructions from the controller of the energy storage converter PCS, switch state control of the switch elements in the interface circuit CT, overvoltage protection, undervoltage protection, overheating protection, and fault diagnosis.

[0043] In some possible implementations, the control module EMS can be implemented using a computer device, a single-chip device or other similar electronic devices; based on Figure 2 The communication connection relationship shown, the control module EMS can be used to implement at least one of the following functions: data collection (such as collecting battery operation data, battery cluster operation data and energy storage converter operation data from the controller BCU of the high-voltage box HVB and the controller of the energy storage converter PCS, etc.), data display (such as displaying a specified type of data on a display screen, or regularly sending a specified type of data to a specified device or a specified network node), calculating and updating battery status parameters (such as state of charge SOC or state of health SOH), predicting the remaining life and performance trend of the battery through appropriate algorithms, centrally managing fault information from the controller BCU of each high-voltage box HVB (such as classifying and prioritizing, generating fault diagnosis reports and issuing corresponding control instructions), data interaction with external devices through Ethernet or other communication protocols, reporting the operation status information of the energy storage box to the upper system, overvoltage protection, undervoltage protection, overheating protection, energy management and scheduling optimization, and optimizing energy distribution. In some possible implementations, the control module EMS is respectively connected to the first switch K1 and each second switch K2 in the confluence module to respectively control the switch state of the first switch K1 and each second switch K2. In this way, the control module EMS can control the working state of the convergence module according to the collected data, such as cutting off the corresponding second switch K2 when one or some battery clusters 21 / energy storage converters PCS fail, and so on.

[0044] See also Figure 2In one example, a switch circuit SW is provided in the power distribution cabinet PB, and the switch circuit SW is spaced between the junction module of the junction cabinet TB and the AC output port OUT of the energy storage box to realize at least one function of, for example, whole machine switch control, output overcurrent protection (for example, by means of a fuse or an air switch), power distribution control, and meter monitoring. In one example, at least one meter is provided in the switch circuit SW of the power distribution cabinet PB, and the control module EMS is respectively connected to the measurement signal output terminal of each meter, so that the control module EMS can collect the corresponding data at the AC output port OUT of the energy storage box.

[0045] In some possible implementations, the first compartment 11 includes a plurality of sub-compartments arranged along a first direction X0 (a direction parallel to the bottom surface of the energy storage box), each battery cluster 21 is disposed in a sub-compartment corresponding to the battery cluster 21, and a plurality of battery assemblies BU and high-voltage boxes HVB in each battery cluster 21 are arranged in sequence along a second direction Z0 (a direction from the top surface of the energy storage box to the bottom surface of the energy storage box). Figure 1 In one example, three battery clusters 21 arranged along the first direction X0 are provided in the first sub-chamber 111 of the first compartment 11, and two battery clusters 21 arranged along the first direction X0 are provided in the second sub-chamber 112 of the first compartment 11. The first sub-chamber 111, the second sub-chamber 112 and the second compartment 12 are arranged in sequence along the first direction X0; the five battery assemblies BU and the high-voltage box HVB in each battery cluster 21 are arranged in sequence along the second direction Z0, and the five battery clusters 21 are aligned in the horizontal direction.

[0046] In some possible implementations, the second cabin 12 is located on one side of the first cabin 11 in the first direction X0, the second cabin 12 includes a control room 121, a power distribution cabinet PB, a junction cabinet TB and a cold cabinet CB, a plurality of energy storage converters PCS and a control module EMS are arranged in the control room 121, the junction module TB is arranged in the junction cabinet TB, the power distribution cabinet PB, the junction cabinet TB and the cold cabinet CB are arranged in sequence along the second direction Z0 on the side of the control room 121 away from the first cabin 11, the energy storage box also includes: at least one electric meter arranged in the power distribution cabinet PB, a liquid cooler arranged in the cold cabinet CB and a fire protection system FS arranged in the control room 121, and the control module EMS is respectively connected to the measurement signal output end of each electric meter, the control end of the liquid cooler and the control end of the fire protection system FS. In some possible implementations, the control module EMS is an industrial computer with a touch screen, which is arranged in the control room 121, and all the connection relationships described above are realized through the connection wiring inside the box body 10.

[0047] Figure 4 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application. Figure 4The energy storage system includes any of the above energy storage boxes (e.g. Figure 1 The energy storage box shown in the figure) and the boost box 20, the input port AC1 of the boost box 20 is connected to the AC output port OUT of the energy storage box, and the boost box 20 is provided with a transformer (not shown in the figure) Figure 4 ), the input port of the transformer is connected to the AC output port of the energy storage box through the input port AC1 of the booster box 20, and the output port of the transformer is connected to the output port of the booster box 20. It can be seen that based on the internal structure of the energy storage box, the booster box 20 only needs to be provided with a transformer to convert the AC signal provided by the AC output port OUT into the required amplitude and phase, so as to meet the access requirements of the grid equipment or power transmission equipment to be connected, without the need for other large-volume components.

[0048] In one example, multiple energy storage converters PCS in the energy storage box are configured to output an AC signal with a voltage amplitude of 400V, and the transformer in the boost box 20 is configured to convert the AC signal with a voltage amplitude of 400V into an AC signal with a voltage amplitude of 10500V, so that the AC signal provided by the output port of the boost box 20 meets the access requirements of the grid equipment or power transmission equipment to be connected, thereby realizing the grid-connected connection of the local energy storage system.

[0049] In a comparative example, the energy storage system includes a DC box provided with a plurality of battery clusters 21 and an AC box provided with an energy storage converter PCS and a transformer; in this case, the output port of the DC box needs to include a DC power output port and a communication port, the input port of the AC box needs to include a DC power input port and a communication port, and a DC power transmission line and a communication transmission line need to be used to achieve the following. Figure 2 or Figure 3 The circuit connection relationship shown. In contrast, the embodiment of the present application only needs to use a universal AC port and AC transmission line to connect the energy storage box and the booster box, which can not only simplify the interface and reduce the number of connecting cables, but also shorten the total length of the communication transmission line (the local communication lines in the embodiment of the present application are all arranged inside the energy storage box and do not need to be connected to the outside, so the total length is shorter), helping to improve the efficiency of the control system. In addition, since the energy storage converter PCS is integrated with the battery cluster in the embodiment of the present application, the matching booster box can have a very small volume and footprint, which helps to reduce the minimum requirements of the energy storage system for the configuration environment.

[0050] In one example, any one or more of the above-mentioned controllers may include: one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components; any one or more switches, switching elements or switching circuits may be implemented by transistors, controllable resistors, controllable diodes or any other circuit structures with equivalent switching functions.

[0051] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage box, characterized in that: The energy storage box comprises: A box body, wherein the interior of the box body includes a first cabin and a second cabin; A plurality of battery clusters, the plurality of battery clusters being arranged in the first compartment, each of the battery clusters comprising a high voltage box and a plurality of battery assemblies connected in series between a positive input terminal and a negative input terminal of the high voltage box; A plurality of energy storage converters corresponding to the plurality of battery clusters one by one, the plurality of energy storage converters being arranged in the second compartment, and a DC power input port of each of the energy storage converters being connected to an output port of a high-voltage box of the corresponding battery cluster; A confluence module, which is arranged in the second compartment and is respectively connected to the AC power output port of each of the energy storage converters and the AC output port of the energy storage box; A control module is arranged in the second compartment, a first communication terminal of the control module is respectively connected to a communication terminal of a controller of each of the energy storage inverters, and a second communication terminal of the control module is respectively connected to a communication terminal of a controller of a high-voltage box of each of the battery clusters.

2. The energy storage box according to claim 1, characterized in that: The energy storage box also includes a first switch and a second switch. The first communication terminal of the control module is connected to the communication end of the controller of each energy storage inverter through the first switch, and the second communication terminal of the control module is connected to the communication end of the controller of the high-voltage box of each battery cluster through the second switch.

3. The energy storage box according to claim 1, characterized in that: The controller of each energy storage inverter also has a bus connection end, and the controller of each high-voltage box of the battery cluster also has a first bus connection end. The bus connection end of the controller of each energy storage inverter is connected to the first bus connection end of the controller of the high-voltage box of the corresponding battery cluster.

4. The energy storage box according to claim 1, characterized in that: The controller of the high-voltage box of each battery cluster also has a second bus connection terminal, and the second bus connection terminal of the controller of the high-voltage box of each battery cluster is respectively connected to the bus connection terminal of the controller of each battery assembly in the battery cluster.

5. The energy storage box according to claim 1, characterized in that: The energy storage converter is configured to output an AC signal with a voltage amplitude of 400V at the AC output port.

6. The energy storage box according to any one of claims 1 to 5, characterized in that: The convergence module includes a first switch and a plurality of second switches corresponding one-to-one to the plurality of energy storage inverters, wherein the first switch is connected between the AC output port of the energy storage box and a first node, and each of the second switches is connected between the first node and the AC power output port of the corresponding energy storage inverter.

7. The energy storage box according to claim 6, characterized in that: The control module is respectively connected to the first switch and each of the second switches to respectively control the switch states of the first switch and each of the second switches.

8. The energy storage box according to any one of claims 1 to 5, characterized in that: The first compartment includes a plurality of sub-compartments arranged along a first direction, each of the battery clusters is disposed in a sub-compartment corresponding to the battery cluster, and the plurality of battery assemblies and the high-voltage box in each of the battery clusters are sequentially arranged along a second direction, the first direction is a direction parallel to the bottom surface of the energy storage box, and the second direction is a direction from the top surface of the energy storage box to the bottom surface of the energy storage box; The second cabin is located on one side of the first cabin in the first direction, and the second cabin includes a control room, a power distribution cabinet, a junction cabinet and a cold cabinet. The multiple energy storage inverters and the control module are arranged in the control room, and the junction module is arranged in the junction cabinet. The power distribution cabinet, the junction cabinet and the cold cabinet are arranged in sequence along the second direction on the side of the control room away from the first cabin. The energy storage box also includes: at least one electric meter arranged in the power distribution cabinet, a liquid cooler arranged in the cold cabinet and a fire protection system arranged in the control room, and the control module is respectively connected to the measurement signal output end of each electric meter, the control end of the liquid cooler and the control end of the fire protection system.

9. An energy storage system, characterized in that: The energy storage system comprises the energy storage box according to any one of claims 1 to 8.

10. The energy storage system according to claim 9, characterized in that: The energy storage system further includes a boost box, in which a transformer is arranged, an input port of the transformer is connected to an AC output port of the energy storage box, and an output port of the transformer is connected to an output port of the boost box.

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