Energy storage container with maintenance function

Abstract

The application provides an energy storage container with a maintenance function, which comprises an energy storage system and a BMS system, the energy storage system comprises a battery module, a busbar cabinet and an energy storage converter, and the battery module is connected with the energy storage converter through the busbar cabinet; the battery module comprises a plurality of battery clusters, each battery cluster comprises a high-voltage box and a plurality of battery packs, each battery pack comprises a maintenance switch and a plurality of battery cells, and the high-voltage boxes of the battery clusters are connected in parallel to the busbar cabinet; the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of the battery clusters and the battery packs of the battery clusters respectively; and the BMS system is used for troubleshooting the energy storage system when detecting that the energy storage container is in a local maintenance state, and if the energy storage system has a fault, the switches upstream and downstream of the fault point are controlled to be turned off for maintenance or replacement, the fault is reset after a normal signal is detected, and finally the energy storage system is powered on.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery energy storage, and particularly relates to an energy storage container with a maintenance function. BACKGROUND

[0002] As an important part of renewable energy development, the installed capacity of container energy storage systems has experienced explosive growth.

[0003] Currently, the container energy storage system does not have a live maintenance function for the container itself, although a local and remote control device is added, but the control device controls the on-off state of the total switch of the energy storage system to realize the storage and release of electric energy, and is not used for internal maintenance of the container. Currently, the container energy storage system does not have a device or strategy that can cut off the DC high voltage inside the container energy storage system; the container energy storage system has a high risk coefficient for maintenance, and the high voltage between the high-voltage box and the busbar cabinet cannot be quickly and safely disconnected; during the maintenance process, after the BMS restarts, the fault-free system will automatically apply DC high voltage, causing the risk of electric shock to the maintenance personnel. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art.

[0005] To this end, the present application aims to provide an energy storage container with a maintenance function to solve the problem that the existing container energy storage system does not have a live maintenance function for the container itself, and to improve the safety during maintenance.

[0006] To achieve the above-mentioned purpose, the present application provides an energy storage container with a maintenance function, comprising an energy storage system and a BMS system, the energy storage system comprising a battery module, a busbar cabinet and an energy storage converter, the battery module being connected with the energy storage converter through the busbar cabinet;

[0007] The battery module comprises a plurality of battery clusters, each battery cluster comprising a high-voltage box and a plurality of battery packs, each battery pack comprising a maintenance switch and a plurality of battery cells, and the high-voltage boxes of each battery cluster are connected in parallel to the busbar cabinet;

[0008] The BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of each battery cluster and the battery packs of each battery cluster, respectively; the BMS system is used to troubleshoot the energy storage system when it is detected that the energy storage container is in a local maintenance state, and if the energy storage system has a fault, the switches upstream and downstream of the fault point are controlled to be disconnected for maintenance or replacement, and when a normal signal is detected, the fault is returned to normal, and finally the energy storage system is powered on.

[0009] In the energy storage container with maintenance function provided in the first aspect of the present application, the BMS system, when used for controlling the switches upstream and downstream of the fault point to be disconnected for maintenance or replacement if the energy storage system has a fault, and performing fault recovery after detecting the confirmation normal signal, is specifically used for: if the busbar cabinet has a fault, controlling the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters to be disconnected; when receiving the disconnection feedback signals corresponding to the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters, generating a maintenance or replacement permission signal for maintenance or replacement, and performing fault recovery on the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters after detecting the confirmation normal signal.

[0010] In the energy storage container with maintenance function provided in the first aspect of the present application, the BMS system, when used for controlling the switches upstream and downstream of the fault point to be disconnected for maintenance or replacement if the energy storage system has a fault, and performing fault recovery after detecting the confirmation normal signal, is specifically used for: if the busbar cabinet has a fault, controlling the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters to be disconnected; when receiving the disconnection feedback signals corresponding to the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters, generating a maintenance or replacement permission signal for maintenance or replacement, and performing fault recovery on the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters after detecting the confirmation normal signal.

[0011] In the energy storage container with maintenance function provided in the first aspect of the present application, the BMS system, when used for controlling the switches upstream and downstream of the fault point to be disconnected for maintenance or replacement if the energy storage system has a fault, and performing fault recovery after detecting the confirmation normal signal, is specifically used for: if the busbar cabinet has a fault, controlling the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters to be disconnected; when receiving the disconnection feedback signals corresponding to the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters, generating a maintenance or replacement permission signal for maintenance or replacement, and performing fault recovery on the DC input total switch in the energy storage converter and the circuit breaker in the high-voltage box of each group of battery clusters after detecting the confirmation normal signal.

[0012] In the energy storage container with maintenance function provided in the first aspect of the present application, the BMS system comprises a total controller unit, a plurality of single battery management units and a plurality of battery cluster management units, the total controller unit is connected with the busbar cabinet, the energy storage converter and each battery cluster management unit respectively; in each group of battery clusters, each battery pack is connected with a single battery management unit, and the high-voltage box is connected with a battery cluster management unit, and all the single battery management units connected with the group of battery clusters are also connected with the battery cluster management unit connected with the high-voltage box in the group of battery clusters.

[0013] In the energy storage container with maintenance function provided in the first aspect of the present application, when the total controller unit is connected with the busbar cabinet, the energy storage converter and each battery cluster management unit, the connection is realized through CAN connection; when the battery cluster management unit is connected with the single battery management unit, the connection is realized through CAN connection; when the battery cluster management unit is connected with the high-voltage box, the connection is realized through CAN connection; and when the single battery management unit is connected with the battery pack, the connection is realized through CAN connection.

[0014] In the energy storage container with maintenance function provided in the first aspect of the present application, the high-voltage box comprises a Hall sensor, a negative relay, a circuit breaker, a fuse, a pre-charging resistor, a pre-charging relay and a positive relay, the pre-charging resistor is connected in series with the pre-charging relay and then connected in parallel with the positive relay, in each group of battery clusters, the negative electrode of the first battery pack is connected with the busbar cabinet through the Hall sensor, the negative relay and the circuit breaker, and the positive electrode of the last battery pack is connected with the busbar cabinet through the fuse and the positive relay.

[0015] In the energy storage container with maintenance function provided in the first aspect of the present application, when the BMS system is used for controlling the energy storage system to be powered on, specifically, after detecting a fault recovery signal, the BMS system performs self-checking and detects all the circuit breaker feedback signals of the energy storage system; if there is no fault, the negative relays of all the high-voltage boxes are closed, and the pre-charging relays and the positive relays of the high-voltage boxes and the on-off of the direct current output total switch of the busbar cabinet are controlled based on the pressure difference between each group of battery clusters to realize power-on.

[0016] In the energy storage container with maintenance function provided in the first aspect of the present application, the BMS system is specifically used for judging whether the voltage difference between each battery cluster is less than a first preset voltage difference, and closing each pre-charging relay if yes; judging whether the voltage difference between each battery cluster is greater than or equal to a second preset voltage difference, and performing circulating current if yes until the voltage difference between each battery cluster is less than the second preset voltage difference, then closing each positive electrode relay and opening each pre-charging relay after a first set time; and finally closing the DC output master switch of the busbar cabinet to complete power-up, wherein the first preset voltage difference is greater than the second preset voltage difference.

[0017] In the energy storage container with maintenance function provided in the first aspect of the present application, when the BMS system judges whether the voltage difference between each battery cluster is greater than or equal to a second preset voltage difference, if the voltage difference between each battery cluster is less than the second preset voltage difference, each positive electrode relay is closed after a second set time, and each pre-charging relay is opened after a first set time; and finally the DC output master switch of the busbar cabinet is closed to complete power-up, wherein the first set time is less than the second set time.

[0018] The energy storage container with maintenance function provided in the present application comprises an energy storage system and a BMS system, the energy storage system comprises a battery module, a busbar cabinet and an energy storage converter, the battery module is connected with the energy storage converter through the busbar cabinet; the battery module comprises a plurality of battery clusters, each battery cluster comprises a high-voltage box and a plurality of battery packs, each battery pack comprises a maintenance switch and a plurality of battery cells, and the high-voltage boxes of each battery cluster are connected in parallel to the busbar cabinet; the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of each battery cluster and each battery pack of each battery cluster respectively; and the BMS system is used for performing energy storage system fault diagnosis when detecting that the energy storage container is in an on-site maintenance state, opening the switches upstream and downstream of the fault point for maintenance or replacement if the energy storage system has a fault, performing fault recovery after detecting a normal signal, and finally controlling the energy storage system to power up. In this case, by setting the energy storage system and the BMS system, wherein the energy storage system comprises a battery module, a busbar cabinet and an energy storage converter, the battery module comprises a plurality of battery clusters, each battery cluster comprises a high-voltage box and a plurality of battery packs, each battery pack comprises a maintenance switch and a plurality of battery cells, the high-voltage boxes of each battery cluster are connected in parallel to the busbar cabinet, the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of each battery cluster and each battery pack of each battery cluster respectively, and the BMS system is used for opening the switches upstream and downstream of the fault point for maintenance or replacement when the energy storage system has a fault, the problem that the existing container energy storage system does not have a live maintenance function for the container itself is solved, in addition, fault recovery is performed after a normal signal is detected, and the energy storage system is finally controlled to power up, thereby improving the safety during maintenance.

[0019] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The foregoing and / or additional aspects and advantages of the present application are achieved by providing a containerized energy storage system with maintenance function, which comprises a containerized energy storage system with maintenance function.

[0021] Figure 1 A block diagram of a containerized energy storage system with maintenance function according to an embodiment of the present application;

[0022] Figure 2 A topology diagram of a containerized energy storage system with maintenance function according to an embodiment of the present application;

[0023] Figure 3 A flow chart of a maintenance process of a containerized energy storage system with maintenance function according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The exemplary embodiments will be described in detail with reference to the drawings, wherein like reference numerals refer to like parts throughout the several views. The following description is made with reference to the accompanying drawings in which the specific embodiments of the present application are shown. It is to be understood that the application is not limited to the specific arrangements and instrumentality shown in the drawings.

[0025] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0026] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an implied order of magnitude. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise specifically limited. It should also be understood that the term "and / or" used in the present application means any or all possible combinations of one or more associated listed items.

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application.

[0028] The present application proposes an energy storage container with maintenance function to solve the problem that the existing container energy storage system does not have a live maintenance function for the container itself, and to improve the safety during maintenance.

[0029] Figure 1 A block diagram of an energy storage container with maintenance function provided by an embodiment of the present application.

[0030] As shown in Figure 1 The energy storage container with maintenance function includes an energy storage system and a BMS system (Battery Management System), and the energy storage system includes a battery module, a busbar cabinet and a PCS (Power Conversion System). The PCS is also called a PCS converter.

[0031] In the embodiment of the present application, the battery module is connected to the PCS converter through the busbar cabinet.

[0032] In the embodiment of the present application, the battery module includes a plurality of battery clusters, each battery cluster includes a high-voltage box and a plurality of battery packs, each battery pack includes a maintenance switch and a plurality of battery cells, and the high-voltage boxes of each battery cluster are connected in parallel to the busbar cabinet. The high-voltage box includes a Hall sensor, a negative relay, a circuit breaker, a fuse, a pre-charge resistor, a pre-charge relay and a positive relay, the pre-charge resistor is connected in series with the pre-charge relay and connected in parallel with the positive relay, in each battery cluster, the negative electrode of the first battery pack is connected to the busbar cabinet through the Hall sensor, the negative relay and the circuit breaker, and the positive electrode of the last battery pack is connected to the busbar cabinet through the fuse and the positive relay.

[0033] Taking the number of battery clusters as 12 and the number of battery packs in each battery cluster as 4 as an example, Figure 2A container energy storage electrical system topology with maintenance function provided by the embodiment of the present application.

[0034] As shown in Figure 2 , the battery module includes 12 groups of battery clusters, each group of battery clusters includes 1 high-voltage box and 4 battery packs, and the 4 battery packs in each group of battery clusters are connected in series and connected with the high-voltage box in the group of battery clusters. Specifically, battery pack 1-1 to battery pack 1-4 in the first group of battery clusters are connected in series and connected with high-voltage box 1#; battery pack 2-1 to battery pack 2-4 in the second group of battery clusters are connected in series and connected with high-voltage box 2#; …; battery pack 11-1 to battery pack 11-4 in the eleventh group of battery clusters are connected in series and connected with high-voltage box 11#; battery pack 12-1 to battery pack 12-4 in the twelfth group of battery clusters are connected in series and connected with high-voltage box 12#. High-voltage boxes 1#, 2#, …, 11#, and 12# are connected in parallel to the busbar cabinet.

[0035] Taking the first group of battery clusters as an example, as shown in Figure 2 , each battery pack includes a maintenance switch (MSD) and a plurality of battery cells. The MSD is located at the middle position of the battery pack in which it is located, and the MSD is connected in series with the adjacent battery cells, and the adjacent battery cells in the battery pack are connected in series. The elements contained in the battery packs of the battery clusters of other groups and the connection relationship of the elements can be referred to the first group of battery clusters, which will not be described here.

[0036] Taking high-voltage box 1# of the first group of battery clusters as an example, as shown in Figure 2 , the high-voltage box 1# includes a Hall sensor, a negative relay KM3, a circuit breaker QF, a fuse FU, a positive relay KM1, a pre-charge resistor R1, and a pre-charge relay KM2. The pre-charge resistor R1 is connected in series with the pre-charge relay KM2 and is connected in parallel with the positive relay KM1. The negative electrode of the first battery pack (i.e. battery pack 1-1) of the first group of battery clusters is connected with the busbar cabinet through the Hall sensor, the negative relay KM3, and the circuit breaker QF, and the positive electrode of the tail end battery pack (i.e. battery pack 1-4) is connected with the busbar cabinet through the fuse FU and the positive relay KM1. The elements contained in the high-voltage boxes of the battery clusters of other groups and the connection relationship of the elements can be referred to the high-voltage box 1# of the first group of battery clusters, which will not be described here.

[0037] In this embodiment, the battery module feeds back the on-off state of the MSD and the on-off state of the circuit breaker QF in each group of battery clusters to the BMS system, and the on-off of each relay and circuit breaker in the high-voltage box of each group of battery clusters is controlled by the BMS system.

[0038] In this embodiment, the busbar cabinet includes a fuse FU1 and a DC output master switch QS, and the busbar cabinet feeds back the on-off state of the DC output master switch QS to the BMS system, and the on-off of the DC output master switch QS is controlled by the BMS system.

[0039] In the embodiment, the PCS converter comprises a DC input total switch QF1 and a DC AC converter. The PCS converter feeds back the on-off state of the DC input total switch QF1 to the BMS system, and the on-off of the DC input total switch QF1 is controlled by the BMS system.

[0040] In the embodiment, the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage box of each battery cluster and each battery pack of each battery cluster respectively.

[0041] Specifically, the BMS system comprises a total controller unit, a plurality of single battery management units and a plurality of battery cluster management units. The total controller unit is connected with the busbar cabinet, the energy storage converter and each battery cluster management unit respectively. In each battery cluster, each battery pack is connected with a single battery management unit, and the high-voltage box is connected with a single battery cluster management unit. All the single battery management units connected with the battery cluster are also connected with the battery cluster management unit connected with the high-voltage box in the battery cluster. The total controller unit is connected with the busbar cabinet, the energy storage converter and each battery cluster management unit by CAN connection. The battery cluster management unit is connected with the single battery management unit by CAN connection. The battery cluster management unit is connected with the high-voltage box by CAN connection. The single battery management unit is connected with the battery pack by CAN connection.

[0042] As shown in Figure 2 In the first battery cluster, the battery pack 1-1 is connected with the single battery management unit BMU1-1, …, and the battery pack 1-4 is connected with the single battery management unit BMU1-4. In the second battery cluster, the battery pack 2-1 is connected with the single battery management unit BMU2-1, …, and the battery pack 2-4 is connected with the single battery management unit BMU2-4. … In the eleventh battery cluster, the battery pack 11-1 is connected with the single battery management unit BMU11-1, …, and the battery pack 11-4 is connected with the single battery management unit BMU11-4. In the twelfth battery cluster, the battery pack 12-1 is connected with the single battery management unit BMU12-1, …, and the battery pack 12-4 is connected with the single battery management unit BMU12-4.

[0043] As shown in Figure 2As shown, in the 12 battery clusters, each battery cluster's high-voltage box is connected to a separate Battery Cluster Management Unit (BCMU). All individual battery management units connected to this battery cluster are also connected to the battery cluster management unit connected to the high-voltage box in this battery cluster. Specifically, in the first battery cluster, the high-voltage box 1# CAN is connected to the battery cluster management unit BCMU-1, which is also connected to the individual battery management units BMU1-1, ..., and BMU1-4 CAN; in the second battery cluster, the high-voltage box 2# CAN is connected to the battery cluster management unit BCMU-2, which is also connected to the individual battery management units BMU2-1, ..., and BMU2-4 CAN; ...; in the eleventh battery cluster, the high-voltage box 11# CAN is connected to the battery cluster management unit BCMU-11, which is also connected to the individual battery management units BMU11-1, ..., and BMU11-4 CAN; in the twelfth battery cluster, the high-voltage box 12# CAN is connected to the battery cluster management unit BCMU-12, which is also connected to the individual battery management units BMU12-1, ..., and BMU12-4 CAN.

[0044] like Figure 2 As shown, the battery cluster management units BCMU-1, BCMU-2, ..., BCMU-11, and BCMU-12 are also connected to the main controller unit (BAMS) via CAN. The main controller unit (BAMS) is also connected to the combiner cabinet and the PCS converter via CAN, respectively.

[0045] like Figure 2 As shown, all battery clusters, along with the Battery Cluster Management Unit (BCMU) and Individual Battery Management Unit (BMU) connected to each cluster, constitute the battery compartment. The Main Controller Unit (BAMS) and combiner cabinet constitute the electrical compartment. The PCS converter constitutes the PCS boost converter integrated compartment.

[0046] In this embodiment, each individual battery management unit (BMU) is used to monitor the on / off status of the corresponding battery pack's MSD.

[0047] In this embodiment, each battery cluster management unit (BCMU) is used to forward the on / off status of each MSD in its battery cluster to the main control unit (BAMS), and is also used to control the on / off status of each relay and circuit breaker in the high-voltage box of its battery cluster based on the instructions of the main control unit (BAMS), and is also used to monitor the on / off status of the circuit breaker in the high-voltage box of its battery cluster and send it to the main control unit (BAMS).

[0048] In the embodiment, the total controller unit (BAMS) is configured to receive the on-off states of the MSDs of all battery clusters, receive the on-off states of the breakers in the high-voltage boxes of all battery clusters, monitor the on-off states of the DC output total switch QS in the busbar cabinet and the DC input total switch QF1 in the PCS converter, and control the on-off of the DC output total switch QS in the busbar cabinet and the DC input total switch QF1 in the PCS converter.

[0049] In the embodiment, the BMS system is configured to perform troubleshooting of the energy storage system when detecting that the energy storage container is in the on-site maintenance state, control the switches upstream and downstream of the fault point to be turned off for maintenance or replacement if the energy storage system has a fault, perform fault recovery after detecting a confirmation normal signal, and finally control the energy storage system to be powered on.

[0050] In the embodiment, the BMS system is configured to perform troubleshooting of the energy storage system when detecting that the energy storage container is in the on-site maintenance state, control the switches upstream and downstream of the fault point to be turned off for maintenance or replacement if the energy storage system has a fault, perform fault recovery after detecting a confirmation normal signal, and finally control the energy storage system to be powered on.

[0051] In the embodiment, the BMS system is configured to perform troubleshooting of the energy storage system when detecting that the energy storage container is in the on-site maintenance state, control the switches upstream and downstream of the fault point to be turned off for maintenance or replacement if the energy storage system has a fault, perform fault recovery after detecting a confirmation normal signal, and finally control the energy storage system to be powered on.

[0052] Wherein the BMS system is used for controlling the switches upstream and downstream of the fault point to be disconnected for maintenance or replacement if the energy storage system has a fault, and when a normal signal is detected, the fault is restored, and specifically used for: if there is a battery pack fault, the battery cluster where the faulty battery pack is located is regarded as a target battery cluster; the circuit breaker in the high-voltage box of the target battery cluster is controlled to be disconnected; when receiving the disconnection feedback signal of the circuit breaker in the high-voltage box of the target battery cluster and the maintenance switches of the adjacent battery packs upstream and downstream of the faulty battery pack, a maintenance or replacement permission signal is generated to perform maintenance or replacement, and when a normal signal is detected, the circuit breaker in the high-voltage box of each battery cluster and the maintenance switches of the battery packs at both ends of the target battery cluster are restored.

[0053] In the embodiment, the BMS system is used for controlling the energy storage system to be powered on, and specifically used for: when a fault restoration signal is detected, the BMS system is self-checked for faults and all circuit breaker feedback signals of the energy storage system are detected; if there is no fault, the negative relays of all high-voltage boxes are closed, and the pre-charging relays and positive relays of the high-voltage boxes and the on-off of the DC output total switch of the busbar cabinet are controlled based on the pressure difference between each battery cluster to realize power-on.

[0054] Wherein, the BMS system is used for controlling the pre-charging relays and positive relays of the high-voltage boxes and the on-off of the DC output total switch of the busbar cabinet based on the pressure difference between each battery cluster to realize power-on, and specifically used for: judging whether the pressure difference between each battery cluster is less than a first preset pressure difference, if yes, closing each pre-charging relay; judging whether the pressure difference between each battery cluster is greater than or equal to a second preset pressure difference, if yes, performing circulating current until the pressure difference between each battery cluster is less than the second preset pressure difference, then closing each positive relay and disconnecting each pre-charging relay after a first set time; finally closing the DC output total switch of the busbar cabinet to complete power-on, and the first preset pressure difference is greater than the second preset pressure difference.

[0055] Wherein, when the BMS system judges whether the pressure difference between each battery cluster is greater than or equal to the second preset pressure difference, if the pressure difference between each battery cluster is less than the second preset pressure difference, each positive relay is closed after a second set time, and each pre-charging relay is disconnected after a first set time; finally, the DC output total switch of the busbar cabinet is closed to complete power-on, and the first set time is less than the second set time.

[0056] Figure 3 The maintenance process flowchart of the container energy storage with maintenance function provided by the embodiment of the application.

[0057] In combination with Figure 3 , the specific power-on maintenance process of the energy storage container with maintenance function is as follows:

[0058] 1) System power-on process:

[0059] Determine to close all high-voltage box branch circuit breakers, which can be manually implemented by the user or automatically controlled;

[0060] Power on the BMS system;

[0061] Determine the current state of the energy storage container (the current state can be determined based on the on-site maintenance and remote control switch), if it is an on-site maintenance state, proceed to the maintenance process;

[0062] If the current state is a remote state or the maintenance is complete (i.e., a fault recovery signal is received), the BMS performs a system self-check and detects circuit breaker feedback; wherein the BMS performs a system self-check means that the total controller unit in the BMS, each battery management unit and each battery cluster management unit all perform a self-check, and detect whether all circuit breaker feedback signals of the energy storage system are feedback signals in the closed state;

[0063] Detect whether there is a fault, which is based on the BMS self-check result to determine whether the BMS system is fault-free and whether all circuit breakers are closed; if not, terminate the power-on;

[0064] If yes (i.e., no fault), close all negative relays;

[0065] Determine whether the inter-cluster voltage difference of each group of battery clusters is less than a first predetermined voltage difference, for example, 20V, if not, terminate the power-on;

[0066] If yes, proceed to the DC high-voltage power-on process;

[0067] 2) Maintenance process:

[0068] The BMS automatically checks whether the energy storage system has a fault;

[0069] If there is no fault after automatic checking, proceed to fault recovery, generate a fault recovery signal, and indicate that the maintenance is complete;

[0070] If there is a fault after automatic checking, take the busbar cabinet, high-voltage box and high-voltage box fault as an example for illustration:

[0071] 2-11) When the busbar cabinet fails, the BMS instructs to disconnect QF1 and all QF, specifically, after the maintenance personnel confirms on the BMS system, the BAMS in the BMS instructs to control to disconnect the DC input master switch QF1 in the PS converter, and through all BCMUs control to disconnect the circuit breakers QF in the corresponding high-voltage box;

[0072] 2-12) Confirm whether the feedback is disconnected, specifically, the BAMS confirms whether it receives the disconnection feedback signal corresponding to the disconnection of QF1 and all QF in the open state, if not, continue to control to disconnect QF1 and all QF;

[0073] 2-13) If yes (i.e. receiving the disconnection feedback signal of QF1, all QF), a maintenance or replacement permission signal is generated to start replacing or repairing the damaged components, waiting for the completion of the maintenance or replacement, checking and confirming whether it is normal after the completion of the maintenance or replacement, if normal, a normal confirmation signal is generated, and after detecting the normal confirmation signal, the fault is recovered, and after generating the fault recovery signal;

[0074] 2-21) When the high-voltage box fails, the BMS instructs to disconnect QS, all QF, and the MSD of the battery pack N-1, N-4 corresponding to the failed high-voltage box. Specifically, after the maintenance personnel confirm on the BMS system, the BAMS in the BMS instructs to control the disconnection of the DC output total switch QS in the busbar cabinet and controls the disconnection of the circuit breaker QF in the corresponding high-voltage box through all BCMUs, and waits for a first processing duration (which is the time for the maintenance personnel to remove the MSD of the head-end battery pack and tail-end battery pack of the battery cluster where the failed high-voltage box is located);

[0075] 2-22) Confirming whether the disconnection feedback is received, specifically, the BAMS confirms whether the disconnection feedback signal corresponding to the disconnection state of QS, all QF, N-1, N-4 MSD is received, if not, continue to control the disconnection of QS, all QF, and continue to wait for the first processing duration;

[0076] 2-23) If yes (i.e. receiving the disconnection feedback signal of QS, all QF, N-1, N-4 MSD), a maintenance or replacement permission signal is generated to start replacing or repairing the damaged components, waiting for the completion of the maintenance or replacement, checking and confirming whether it is normal after the completion of the maintenance or replacement, if normal, a normal confirmation signal is generated, and after detecting the normal confirmation signal, the fault is recovered, and after generating the fault recovery signal;

[0077] 2-31) When the Pack pack (i.e. battery pack) fails, the BMS instructs to disconnect QF, and remove the MSD of the battery pack above and below the failed battery group. Specifically, after the maintenance personnel confirm on the BMS system, the BAMS in the BMS instructs to control the disconnection of the circuit breaker QF in the high-voltage box of the battery cluster where the failed battery pack is located, and waits for a second processing duration (which is the time for the maintenance personnel to remove the MSD of the battery pack upstream and downstream of the failed battery group);

[0078] 2-32) Confirming whether the disconnection feedback is received, specifically, the BAMS confirms whether the disconnection feedback signal corresponding to the disconnection state of QF, the MSD of the battery pack above and below the failed battery group is received, if not, continue to control the disconnection of QF, and continue to wait for the second processing duration;

[0079] 2-33) if yes (i.e. receiving the QF, the disconnection feedback signal of the upper and lower battery packs MSD of the faulty battery pack), a repair or replacement permission signal is generated to start replacing or repairing the damaged components, waiting for the repair or replacement to be completed, checking and confirming whether it is normal after the repair or replacement is completed, if it is normal, a normal confirmation signal is generated, and after detecting the normal confirmation signal, the fault is reset, and after the fault reset signal is generated;

[0080] 3) DC high voltage power-on process:

[0081] Close the pre-charging relay;

[0082] Determine whether the inter-cluster voltage difference of each group of battery clusters is greater than or equal to the second preset voltage difference, for example 10V, if not (i.e. the inter-cluster voltage difference is less than 10V), delay for a second set time, for example 5S, to close the positive electrode relay, delay for 2S to disconnect the pre-charging relay, and then jump to close the bus cabinet main circuit breaker / disconnecting switch;

[0083] If the inter-cluster voltage difference is greater than or equal to 10V, perform a circulating current until the inter-cluster voltage difference is less than 10V;

[0084] Close the positive electrode relay; delay for a first set time, for example 2S, to disconnect the pre-charging relay;

[0085] Close the bus cabinet main circuit breaker / disconnecting switch, and the power-on is completed.

[0086] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0087] The energy storage container with a maintenance function in the embodiment of the application comprises an energy storage system and a BMS system, the energy storage system comprises a battery module, a busbar cabinet and an energy storage converter, the battery module is connected with the energy storage converter through the busbar cabinet; the battery module comprises a plurality of battery clusters, each battery cluster comprises a high-voltage box and a plurality of battery packs, each battery pack comprises a maintenance switch and a plurality of battery cells, and the high-voltage boxes of the battery clusters are connected in parallel to the busbar cabinet; the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of the battery clusters and the battery packs of the battery clusters respectively; the BMS system is used for troubleshooting the energy storage system when it is detected that the energy storage container is in a local maintenance state, and if the energy storage system has a fault, the switches upstream and downstream of the fault point are controlled to be turned off for maintenance or replacement, and when a normal signal is detected, the fault is reset, and finally the energy storage system is powered on. In this case, by setting the energy storage system and the BMS system, wherein the energy storage system comprises a battery module, a busbar cabinet and an energy storage converter, the battery module comprises a plurality of battery clusters, each battery cluster comprises a high-voltage box and a plurality of battery packs, each battery pack comprises a maintenance switch and a plurality of battery cells, and the high-voltage boxes of the battery clusters are connected in parallel to the busbar cabinet, the BMS system is connected with the busbar cabinet, the energy storage converter, the high-voltage boxes of the battery clusters and the battery packs of the battery clusters respectively, and the BMS system is used for controlling the switches upstream and downstream of the fault point to be turned off for maintenance or replacement when the energy storage system has a fault, thereby solving the problem that the existing container energy storage system does not have a live maintenance function for the container itself, and in addition, when a normal signal is detected, the fault is reset, and finally the energy storage system is powered on, thereby improving the safety during maintenance.

[0088] Compared with the prior art, the BMS system is powered on and then enters the system self-checking, the automatic high-voltage power-on dangerous condition, the maintenance personnel cannot consciously control the power-on, the system of the application wants to normally power on high voltage, the BMS system will first automatically troubleshoot the system without faults, then reset the fault, and only then will the system execute the strategy of direct-current high-voltage power-on; in the case where it is not convenient to open the battery compartment door, the battery cluster direct-current high-voltage on-off can be controlled, and the electrical components in the busbar cabinet can be replaced and maintained safely and securely; the efficiency of on-site after-sales maintenance of the project is improved, and the maintenance of replacing the electrical components in the busbar cabinet and the high-voltage box and fastening the cable copper nose screw reaches the purpose of safety, high efficiency and low cost.

[0089] The energy storage container system of the present application adds a maintenance switch, which can better control the high voltage power, and fills the blank area of the energy storage system without maintenance function. The BMS control logic is optimized, the control strategy is modified, and the function of the container energy storage electrical system with control power maintenance is realized. The system has the following beneficial effects: without increasing the cost, the safety function of the container energy storage system is improved, and the safety is provided for maintenance or maintenance; the maintenance function under the on-site mode is added to the container energy storage system, and the blank area of the energy storage system without maintenance function is filled; the after-sales problem investigation and maintenance efficiency will be significantly improved. The newly developed 2000V, 6MWh or more energy storage systems on the market will be fully applied, and the space of the 6MWh or more system is small, and the main switch will be deleted, so the high voltage disconnect point must be added, and this function can only be realized in the high voltage box. It is more suitable for the field of ship energy storage container, and the energy storage system with on-site and remote functions can effectively avoid the safety factor of installation, maintenance, maintenance and other operations of the container and the PCS energy storage converter not in the same area.

[0090] The structural schematic diagram according to the disclosed embodiment of the present application is shown in the accompanying drawings. These drawings are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and position relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0091] It should be understood that various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in different order, as long as the desired results of the disclosed technical solutions of the present application can be achieved, and the present application is not limited herein.

[0092] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An energy storage container with maintenance function, characterized in that, It includes an energy storage system and a BMS system. The energy storage system includes battery modules, combiner cabinets, and energy storage converters. The battery modules are connected to the energy storage converters via the combiner cabinets. The battery module includes multiple battery clusters, each battery cluster includes a high-voltage box and multiple battery packs, each battery pack includes a maintenance switch and multiple battery cells, and the high-voltage boxes of each battery cluster are connected in parallel to the combiner cabinet; The BMS system is connected to the combiner cabinet, the energy storage converter, the high-voltage box of each battery cluster, and each battery pack of each battery cluster. The BMS system is used to detect whether the energy storage container is under on-site maintenance, and when it detects that the energy storage container is under on-site maintenance, it performs troubleshooting of the energy storage system, specifically: If the combiner cabinet malfunctions, the DC input main switch in the energy storage converter and the circuit breakers in the high-voltage boxes of each battery cluster will be disconnected. When a disconnection feedback signal is received from the DC input main switch in the energy storage converter and the circuit breakers in the high-voltage boxes of each battery cluster, a maintenance or replacement permission signal is generated to perform maintenance or replacement. When a normal signal is detected, the fault reset is performed on the DC input main switch in the energy storage converter and the circuit breakers in the high-voltage boxes of each battery cluster. as well as If a high-voltage box fault is detected, the DC output main switch in the combiner cabinet and the circuit breaker in the high-voltage box of each battery cluster will be disconnected. When a disconnection feedback signal is received from the DC output main switch in the combiner cabinet, the circuit breaker in the high-voltage box of each battery cluster, and the maintenance switch of the first and last battery packs of the battery cluster where the faulty high-voltage box is located, a maintenance or replacement permission signal is generated to carry out maintenance or replacement. When a normal signal is detected, the fault reset is performed on the DC output main switch in the combiner cabinet, the circuit breaker in the high-voltage box of each battery cluster, and the maintenance switch of all battery packs in all battery clusters. as well as If a battery pack failure is detected, the battery cluster containing the faulty battery pack is considered the target battery cluster. The circuit breaker in the high-voltage box of the target battery cluster is opened. When a feedback signal is received from the circuit breaker in the high-voltage box of the target battery cluster or the maintenance switch of the upstream and downstream adjacent battery packs of the faulty battery pack, a maintenance or replacement permission signal is generated to carry out maintenance or replacement. When a normal signal is detected, the circuit breakers in the high-voltage boxes of each battery cluster and the maintenance switches of the battery packs at both ends of the target battery cluster are reset to fault status.

2. The energy storage container with maintenance function according to claim 1, characterized in that, The BMS system includes a central controller unit, multiple individual battery management units, and multiple battery cluster management units. The central controller unit is connected to the combiner cabinet, the energy storage converter, and each battery cluster management unit. In each battery cluster, each battery pack is connected to a separate individual battery management unit, and the high-voltage box is connected to a separate battery cluster management unit. All individual battery management units connected to the battery cluster are also connected to the battery cluster management unit connected to the high-voltage box in the same battery cluster.

3. The energy storage container with maintenance function according to claim 2, characterized in that, The main controller unit is connected to the combiner cabinet, the energy storage converter and each battery cluster management unit via CAN. The battery cluster management unit is connected to the individual battery management unit via CAN. The battery cluster management unit is connected to the high-voltage box via CAN. The individual battery management unit is connected to the battery pack via CAN.

4. The energy storage container with maintenance function according to claim 1, characterized in that, The high-voltage box includes a Hall sensor, a negative relay, a circuit breaker, a fuse, a pre-charge resistor, a pre-charge relay, and a positive relay. The pre-charge resistor is connected in series with the pre-charge relay and then in parallel with the positive relay. In each battery pack, the negative terminal of the first battery pack is connected to the combiner cabinet via the Hall sensor, the negative relay, and the circuit breaker, while the positive terminal of the last battery pack is connected to the combiner cabinet via the fuse and the positive relay.

5. The energy storage container with maintenance function according to claim 4, characterized in that, The BMS system, when used to control the power-on of the energy storage system, is specifically used for: Upon detecting a fault reset signal, the BMS system performs a fault self-test and detects the feedback signals of all circuit breakers in the energy storage system. If there is no fault, close the negative relays of all high-voltage boxes, and based on the voltage difference between each battery cluster, control the on / off state of the pre-charge relays and positive relays of the high-voltage boxes, as well as the DC output main switch of the combiner cabinet to achieve power-on.

6. The energy storage container with maintenance function according to claim 5, characterized in that, The BMS system, when used to control the on / off state of the pre-charge relay and positive relay of the high-voltage box, and the DC output main switch of the combiner cabinet based on the voltage difference between each battery cluster to achieve power-on, is specifically used for: Determine whether the voltage difference between each battery cluster is less than the first preset voltage difference; if so, close each pre-charge relay. Next, determine whether the voltage difference between each battery cluster is greater than or equal to the second preset voltage difference. If so, perform circulation until the voltage difference between each battery cluster is less than the second preset voltage difference. Then, close each positive relay and disconnect each pre-charge relay after a first set time. Finally, close the DC output main switch of the combiner cabinet to complete the power-on. The first preset voltage difference is greater than the second preset voltage difference.

7. The energy storage container with maintenance function according to claim 5, characterized in that, When the BMS system determines whether the voltage difference between each battery cluster is greater than or equal to the second preset voltage difference, if the voltage difference between each battery cluster is less than the second preset voltage difference, it closes each positive relay after a second set time period and opens each pre-charge relay after a first set time period; finally, it closes the DC output main switch of the combiner cabinet to complete the power-on, and the first set time period is less than the second set time period.

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