Energy storage system and fault monitoring method therefor

Abstract

An energy storage system (10) and a fault monitoring method therefor. The energy storage system (10) is provided with a fuse in each of battery packs (122), high-voltage boxes (121) and a busbar cabinet (11); a third-grade fuse (133) provided in the busbar cabinet (11) is easiest to fuse, followed by second-grade fuses (132) in the high-voltage boxes (121), and first-grade fuses (131) in the battery packs (122) are least liable to fuse, such that when the energy storage system (10) has had a short-circuit fault, the respective fuses can be subjected to graded fusing, and the easier the fuses fuse, the smaller the number of the fuses, thus reducing costs required for replacing fuses, shortening maintenance time, and improving the maintenance efficiency while achieving protection of the energy storage system (10). In addition, a microswitch is provided for each fuse, and the state of each fuse is acquired by means of linkage between the corresponding microswitch and the fuse. The state of each fuse can be monitored on the basis of the microswitch, etc., such that a fused fuse can be found and located in time, and the position where a short-circuit fault has occurred can be deduced and located, thus further improving the maintenance efficiency.

Description

Energy storage system and fault monitoring method thereof Technical Field

[0001] The present disclosure relates to the technical field of energy storage batteries, and in particular to an energy storage system and a fault monitoring method thereof. Background Art

[0002] Energy storage systems typically consist of multiple battery packs connected in series to a high-voltage box, forming a battery cluster. These battery clusters are then connected in parallel and connected to the corresponding power conversion system (PCS) via a combiner cabinet. Within energy storage systems, the DC side of the inverter presents a potential short-circuit risk, posing a serious threat to system safety. As energy storage systems scale, the number of DC-side battery packs increases, and the potential for short-circuit failures becomes more complex. Each short-circuit failure can be time-consuming and expensive to repair.

[0003] Summary of the Invention

[0004] The purpose of the embodiments of the present disclosure is to provide an energy storage system and a fault monitoring method thereof to improve maintenance efficiency.

[0005] In a first aspect, an embodiment of the present disclosure provides an energy storage system, comprising:

[0006] Combiner cabinet; the output end of the combiner cabinet is connected to the DC side of the energy storage inverter;

[0007] A plurality of battery clusters are connected in parallel to the input end of the combiner cabinet;

[0008] The battery cluster includes a high-voltage box and a plurality of battery packs connected in series;

[0009] The battery pack is provided with a first-level fuse, the high-voltage box is provided with a second-level fuse, and the combiner cabinet is provided with a third-level fuse;

[0010] The pre-arc Joule integral of the first-stage fuse is greater than the total Joule integral of the second-stage fuse.

[0011] In an optional embodiment, the ratio of the pre-arcing Joule integral of the first-stage fuse to the total Joule integral of the second-stage fuse is not less than 1.5;

[0012] The parallel pre-arcing Joule integral of the plurality of second-stage fuses is greater than the total Joule integral of the third-stage fuses; wherein the parallel pre-arcing Joule integral of the plurality of second-stage fuses is N 2 *Q 21 ;Q 21 is the pre-arcing Joule integral of a single second-level fuse, and N is the number of battery clusters.

[0013] In an optional embodiment, when a short circuit fault occurs at the output end of the combiner cabinet, the third-level fuse blows to protect the battery cluster;

[0014] When a short circuit fault occurs at the input end of the combiner cabinet, the third-level fuse and the second-level fuse in each battery cluster are blown to protect the battery packs in the battery cluster;

[0015] When a short circuit fault occurs in a first battery cluster among the multiple battery clusters, the second-level fuse in the high-voltage box in the first battery cluster blows, and the first-level fuse in at least one battery pack in the first battery cluster blows to protect other battery clusters outside the first battery cluster.

[0016] In an optional embodiment, at least one of the first-stage fuse, the second-stage fuse, and the third-stage fuse is configured with a micro switch; the switching state of the micro switch changes with the fusing state of the corresponding fuse.

[0017] In an optional embodiment, the energy storage system further includes a battery management system; the battery management system includes: a slave control unit, a master control unit and a master control unit;

[0018] The slave control unit is configured to obtain first status information of the first-stage fuse through the micro switch and send the information to the master control unit;

[0019] The main control unit is configured to obtain second status information of the second-stage fuse through the micro switch, and send the second status information and the received first status information to the main control unit;

[0020] The main control unit is used to obtain the third status information of the third-level fuse through the micro switch, receive the first status information and the second status information sent by the main control unit, and monitor the fault condition of the energy storage system according to the first status information, the second status information and the third status information.

[0021] In a second aspect, an embodiment of the present disclosure provides a method for monitoring faults in an energy storage system, which is applied to the energy storage system described in the first aspect. The method includes:

[0022] Obtaining status information of each fuse in the energy storage system;

[0023] When it is determined according to the state information that any fuse is blown, generating first prompt information;

[0024] The location of the fault point is determined according to the location of the blown fuse, and a second prompt message is generated.

[0025] In an optional embodiment, the first prompt information includes information indicating the location of the blown fuse;

[0026] The second prompt information includes information representing the location of the fault point.

[0027] In an optional embodiment, determining the location of the fault point according to the location of the blown fuse includes:

[0028] When only the third-level fuse provided in the combiner cabinet is blown, it is determined that a short circuit fault occurs at the output end of the combiner cabinet;

[0029] When the third-level fuse provided in the combiner cabinet is blown, and the second-level fuses provided in the high-voltage boxes of the respective battery clusters are blown, it is determined that a short circuit fault occurs at the input end of the combiner cabinet;

[0030] When a second-level fuse provided in a high-voltage box of a first battery cluster is blown and a first-level fuse provided in at least one battery pack of the first battery cluster is blown, it is determined that a short circuit fault occurs in the first battery cluster.

[0031] In a third aspect, an embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the method described in the second aspect above.

[0032] In a fourth aspect, an embodiment of the present disclosure provides an electronic device, including:

[0033] a memory having a computer program stored thereon;

[0034] A processor is used to execute the computer program in the memory to implement the method as described in the second aspect above.

[0035] In the disclosed embodiment, fuses are arranged in stages within the battery pack, high-voltage box, and combiner cabinet of the energy storage system. The third-stage fuse in the combiner cabinet is the most likely to blow, the second-stage fuse in the high-voltage box is the second most likely to blow, and the first-stage fuse in the battery pack is the least likely to blow. Therefore, when a short circuit occurs in the energy storage system, the fuses can be blown in stages, with the number of fuses that are more likely to blow being reduced. This protects the energy storage system while reducing the cost of replacing fuses and maintenance time, thereby improving maintenance efficiency.

[0036] In addition, the disclosed embodiment also provides a microswitch for each fuse, which is linked to the corresponding fuse to obtain the fuse status. Based on the aforementioned microswitch and other means, the disclosed embodiment can monitor the status of each fuse, promptly detect and locate a blown fuse, and infer the location of the short circuit fault based on the location of the blown fuse, further improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 shows a schematic structural diagram of an energy storage system provided by an embodiment of the present disclosure;

[0038] FIG2 shows a schematic diagram of an energy storage system in an embodiment of the present disclosure when a short circuit fault occurs at D1;

[0039] FIG3 shows a schematic diagram of an energy storage system in an embodiment of the present disclosure when a short circuit fault occurs at D2;

[0040] FIG4 shows a schematic diagram of an energy storage system in an embodiment of the present disclosure when a short circuit fault occurs at D3;

[0041] FIG5 shows a flow chart of a method for monitoring energy storage system faults according to an embodiment of the present disclosure;

[0042] FIG6 shows a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below through the accompanying drawings and examples, through which the features and advantages of the present application will become more clear and distinct.

[0044] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0045] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0046] The energy storage system and fault monitoring method thereof provided by the embodiments of the present disclosure are described in detail below with reference to specific embodiments in conjunction with the accompanying drawings.

[0047] Large-scale energy storage systems often contain numerous battery packs, typically assembled in containers. Therefore, large-scale energy storage systems are also referred to as energy storage containers. Figure 1 is a schematic diagram of the structure of an energy storage system according to an embodiment of the present disclosure. Referring to Figure 1 , the energy storage system 10 includes a combiner cabinet 11 and multiple battery clusters 12 . The output of the combiner cabinet 11 is connected to the DC side of an energy storage converter 20 , and each battery cluster 12 is connected to the input of the combiner cabinet 11 . In other words, multiple battery clusters 12 are combined through the combiner cabinet 11 and connected to the DC side of the energy storage converter 20 .

[0048] Each battery cluster 12 may include a high-voltage box 121 and a plurality of battery packs 122 connected in series.

[0049] Each battery pack 122 is provided with a first-level fuse 131 , each high-voltage box 121 is provided with a second-level fuse 132 , and the combiner cabinet 11 is provided with a third-level fuse 133 .

[0050] Among them, by selecting and configuring the models of fuses at each level, the fuses at each level can meet the following fusing rules: the third-level fuse blows before the second-level fuse, and the second-level fuse blows before the first-level fuse.

[0051] Different types of fuses have different pre-arcing Joule integrals and total Joule integrals. The Joule integral is the integral of the square of the current passing through the fuse within a given time t, which can be expressed as I 2 The pre-arcing Joule integral is the Joule integral of the fuse before the fuse element melts; the total Joule integral is the sum of the pre-arcing Joule integral and the Joule integral during the arcing time (i.e., the period from the start of melting to the fuse element opening). When the Joule integral on the fuse element reaches the total Joule integral, the fuse element is completely opened. Fuses of the same class can be selected from the same model; fuses of different classes can be selected based on the Joule integral to meet the above-mentioned fusing rules.

[0052] Optionally, to meet the above-mentioned fusing rules, the Joule integral of the fuse can meet the following conditions: Q 11 >Q 22 , where Q 11 Q is the pre-arcing Joule integral of the first-level fuse 11 , Q 22 is the total joule integral of the second-stage fuse.

[0053] According to the above conditions, the total Joule integral Q that causes the first-stage fuse to melt is 12 >Q 11 >Q 22 , and in the same battery cluster, the current flowing through the first-level fuse and the current flowing through the second-level fuse are the same. The first-level fuse must reach its total joule integral Q 12The time required is longer than the time it takes for the second-stage fuse to reach its total Joule integral Q 22 It takes more time, so the second-level fuse in the same battery cluster will blow faster than the first-level fuse, thereby protecting the battery packs in the battery cluster.

[0054] As can be seen from the above structure, the disclosed embodiment arranges fuses in stages within the battery pack, high-voltage box, and combiner cabinet of the energy storage system, with the third-stage fuses in the combiner cabinet being the easiest to blow, followed by the second-stage fuses in the high-voltage box, and the first-stage fuses in the battery pack being the least likely to blow. As a result, the number of fuses that are most likely to blow is reduced, and maintenance is easier. This reduces the cost of replacing fuses, reduces maintenance time, and improves maintenance efficiency.

[0055] In an optional embodiment of the present disclosure, to ensure the above-mentioned fusing rules: the third-level fuse blows before the second-level fuse, and the second-level fuse blows before the first-level fuse, the fuses can be further refined so that the Joule integral of each level of fuse meets at least one of the following conditions:

[0056] (1)Q 11 / Q 22 ≥1.5;

[0057] According to the above embodiments, theoretically, as long as the pre-arc Joule integral Q of the first-stage fuse is 11 Greater than the total Joule integral Q of the second-stage fuse 22 , that is, the ratio of the two Q 11 / Q 22 >1, the second-stage fuse will blow before the first-stage fuse; however, in order to avoid the influence of uncertain factors in actual application, such as individual differences caused by the manufacturing process of fuses, heat dissipation conditions, etc., the ratio Q of the two can be appropriately selected. 11 / Q 22 Larger fuse size, if condition (1) limits Q 11 / Q 22 ≥1.5, that is, the ratio of the pre-arcing Joule integral of the first-stage fuse to the total Joule integral of the second-stage fuse is not less than 1.5; of course, in other embodiments, Q can also be selected in combination with actual application conditions, such as ambient temperature, altitude, heat dissipation conditions, wire connection coefficient, cycle load coefficient and other factors that affect fuse melting. 11 / Q 22 Fuse signals that meet other conditions, such as Q 11 / Q 22 ≥2 etc.

[0058] (2)Q 21_N =N 2 *Q 21 >Q 32, where N is the number of battery clusters, Q 21_N represents the pre-arcing Joule integral of N parallel second-stage fuses, Q 32 is the total Joule integral of the third-level fuse.

[0059] In the embodiment of the present disclosure, the second-stage fuses in N battery clusters are connected in parallel, and their equivalent pre-arc Joule integral is defined as the parallel pre-arc Joule integral Q 21_N =N 2 *Q 21 By carefully selecting the second-level fuse and the third-level fuse that meet the above condition (2), the precise control of the fuse blowing time can be achieved to avoid premature blowing or delayed blowing.

[0060] As can be seen from the above fuse selection conditions, the disclosed embodiments, by tiering fuses in the energy storage system and selecting appropriate fuse models, can not only accurately control the timing of fusing to achieve short-circuit protection for the energy storage system, but also meet the fusing rules of the above-mentioned energy storage system, achieve tiered fusing of the energy storage system in the event of a short-circuit fault, reduce maintenance difficulty, and improve maintenance efficiency.

[0061] The following describes in detail the process of hierarchical fuse blowing in the embodiments of the present disclosure for situations where short circuit faults occur at different locations in the energy storage system.

[0062] Referring to Figure 2 , when a short circuit occurs at point D1 on the output side of the combiner cabinet 11, the current I flowing through the third-level fuse 133 is the sum of the currents i1 of each battery cluster, i.e., I = ∑i1. It should be noted that the current summation formula here is a simplified form. In actual energy storage systems, due to differences in the internal resistance of each battery pack, the currents of each battery cluster may be the same or different, and this is not specifically represented by a formula here. Depending on the fuse selection criteria, as heat accumulates on the fuse element, the third-level fuse 133 will blow before the second-level fuse 132. Once the third-level fuse 133 blows, each battery cluster is disconnected from the short circuit point, thereby protecting each battery cluster. Heat no longer accumulates on the fuse elements of the second-level fuse 132 and the first-level fuse 131 in each battery cluster, and the second-level fuse 132 and the first-level fuse 131 will not blow. Therefore, when a short circuit occurs at a certain point D1 on the output end of the combiner cabinet 11 , only the third-stage fuse 133 in the combiner cabinet 11 is blown, and only the fuse in the combiner cabinet 11 needs to be replaced during maintenance.

[0063] 3, when a short circuit fault occurs at a point D2 on the input end of the combiner cabinet 11, the potential at D2 is the lowest, and the current in the combiner cabinet 11 flows back from the output end to its input end. The current value is the DC current I of the PCS connected to its output end. PCSAt the same time, the current i2 in each battery cluster is also collected at D2, that is, when D2 is short-circuited, the current there is I=I PCS +∑i2. As time passes and heat accumulates, the third-level fuse 133 in the combiner cabinet 11 and the second-level fuse 132 in each battery cluster will both blow, disconnecting each battery cluster from the short-circuit point D2. As a result, the first-level fuse 131 in the battery pack of each battery cluster will not blow, thereby protecting the battery packs within each battery cluster from damage. Therefore, when a short circuit occurs at point D2 on the input end of the combiner cabinet 11, the third-level fuse 133 in the combiner cabinet 11 and the second-level fuse 132 in the high-voltage box of each battery cluster will blow, but the first-level fuse 131 in each battery pack will not blow. During maintenance, only the fuses in the combiner cabinet and each high-voltage box need to be replaced, and no individual battery pack needs to be repaired.

[0064] Referring to FIG4 , a short circuit occurs at a certain point in a battery cluster. FIG4 takes the first battery cluster as an example. For ease of description, the battery cluster with the short circuit is referred to as the first battery cluster. When a point D3 in the first battery cluster is short-circuited, the potential at point D3 in the entire energy storage system is the lowest, and the current converges to D3. That is, the current in the combiner cabinet 11 flows from the output end to its input end in the reverse direction and finally converges into the first battery cluster. The current value is the DC current I of the PCS connected to its output end. PCS At the same time, the current i3 output by other battery clusters is also fed into the first battery cluster, so that the actual current of the first battery cluster is I = I PCS +∑i3; The current flowing through the second-level fuse in the first battery cluster is also I. Therefore, in this case, the heat generated by the current I continues to accumulate, causing the second-level fuse in the first battery cluster and the first-level fuses in some or all of the battery packs in the first battery cluster to melt. The melting of the second-level fuse in the first battery cluster disconnects the combiner cabinet and other battery clusters from the short-circuit point D3. As a result, the first-level and second-level fuses in other battery clusters, as well as the third-level fuse in the combiner cabinet, will not continue to accumulate heat and will not melt, thereby protecting all battery clusters except the first battery cluster that has experienced the short-circuit fault. Therefore, when a short-circuit fault occurs at point D3 within a first battery cluster among multiple battery clusters, the second-level fuse in the first battery cluster and some or all of the first-level fuses therein will melt, while the third-level fuse in the combiner cabinet and the first-level and second-level fuses in other battery clusters will not melt. During maintenance, only the fuse in the first battery cluster needs to be checked and replaced.

[0065] As can be seen from the above description, the disclosed embodiment arranges fuses in a hierarchical manner in the battery packs, high-voltage boxes, and combiner cabinets of the energy storage system. This allows the fuses at locations that are more convenient for maintenance to be blown according to the blowing rules regardless of where a short circuit occurs in the energy storage system. At the same time, more normal battery clusters or battery packs can be disconnected from the short-circuit point in a timely manner, protecting more battery packs from damage, reducing maintenance costs, and improving maintenance efficiency.

[0066] In an optional embodiment of the present disclosure, at least one of the fuses provided in the above-mentioned energy storage system may also be configured with a micro switch. The switching state of the micro switch changes with the blowing state of the corresponding fuse. For example, a micro switch may be configured for the third-level fuse 133, and the micro switch may be a normally closed type or a normally open type. Taking the normally open type as an example, when the third-level fuse 133 is in a normal state (not blown), the corresponding micro switch is always in an open state; when the third-level fuse 133 blows, the corresponding micro switch also operates accordingly and switches to a closed state.

[0067] In view of this, the embodiment of the present disclosure configures micro switches for each level of fuses, so that whether the corresponding fuse is blown can be determined based on the status of the micro switches. Therefore, when a failure occurs in the energy storage system, there is no need to manually check which fuses are blown, thereby improving maintenance efficiency.

[0068] In an optional embodiment of the present disclosure, the energy storage system further includes a battery management system (BMS) configured to collect data such as voltage, current, and temperature of the energy storage system and, based on this data, implement thermal management, charge and discharge management, and fault alarm functions for the energy storage system. In this embodiment of the present disclosure, the upper battery management system may include a slave control unit, a master control unit, and a master control unit.

[0069] The slave control unit, which can be referred to as a battery module unit (BMU), is used to collect and monitor information about each battery pack. In the disclosed embodiment, the slave control unit can collect first status information about the first-stage fuse in each battery pack and upload the first status information to the master control unit.

[0070] The master control unit, which can be referred to as a battery cluster unit (BCU), is used to collect and monitor information about each battery cluster. In the disclosed embodiment, the master control unit can collect second status information about the second-stage fuses in the high-voltage box of each battery cluster and upload this second status information, along with the first status information uploaded by the slave control units, to the master control unit.

[0071] The aforementioned master control unit, which can be referred to as a battery array management unit (BAU), is used to collect and monitor information about the entire battery array comprised of all battery clusters, i.e., the entire energy storage system. In the disclosed embodiment, the master control unit can collect third-state information about the third-level fuses in the combiner cabinet; simultaneously, it receives first-state information and second-state information uploaded by the main control unit; and based on the first, second, and third-state information, monitors energy storage system faults, including but not limited to determining whether a fuse has blown, the location of the blown fuse, and the location of possible short-circuit points.

[0072] In an optional embodiment of the present disclosure, the microswitches corresponding to the first-stage fuses are connected to the slave control unit, the microswitches corresponding to the second-stage fuses are connected to the master control unit, and the microswitches corresponding to the third-stage fuses are connected to the master control unit. In view of this, the slave control units, master control unit, and master control unit can obtain status information of the corresponding fuses based on the status of the microswitches.

[0073] For example, each microswitch can be a normally open switch. When the fuse is not blown, the microswitch is in the open state, and the microswitch signal received by the connected slave control unit, master control unit, and main control unit is a low-level signal. When a fuse is blown, the corresponding microswitch switches to the closed state, and the signal received by the connected slave control unit, master control unit, or main control unit becomes a high-level signal. Therefore, when the battery management system receives a high-level signal from a microswitch, it can be determined that the fuse corresponding to the microswitch has blown. Then, based on the analysis of the blown fuse, the possible short-circuit fault point can be determined, allowing maintenance personnel to quickly discover energy storage system faults, assist maintenance personnel in quickly locating the fault point, and complete maintenance, thereby improving maintenance efficiency.

[0074] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present disclosure, which will not be described one by one here.

[0075] Based on the same concept, the present disclosure also provides a method for monitoring energy storage system faults, which can be applied to the energy storage system described in any of the above embodiments. FIG5 is a flow chart of the method. Referring to FIG5 , the method may include the following steps:

[0076] Step 101, obtaining status information of each fuse in the energy storage system;

[0077] Specifically, the status information acquired in step 101 includes status information of the first-level fuse provided in the battery pack, status information of the second-level fuse provided in the high-voltage box, and status information of the third-level fuse provided in the combiner cabinet.

[0078] Step 102: When it is determined according to the state information that any fuse is blown, a first prompt message is generated;

[0079] Based on the status information of each fuse, it can be determined whether a fuse has blown; when a fuse has blown, the above-mentioned first prompt information can be generated, and the first prompt information can include identification information such as the position or number of the blown fuse, so that maintenance personnel can quickly locate the fuse that needs to be replaced.

[0080] Step 103: determine the location of the fault point according to the location of the blown fuse, and generate second prompt information.

[0081] By utilizing the hierarchical fusing rules of the energy storage system, the location of the fault point can be determined based on the location of the blown fuse, and a second prompt message can be generated to enable maintenance personnel to quickly locate the fault point and eliminate the fault, thereby improving maintenance efficiency.

[0082] In the disclosed embodiments, by real-time monitoring of the status of each fuse in the energy storage system, a blown fuse is promptly discovered, and the location of the fault point is further determined based on the location of the blown fuse, so that maintenance personnel can quickly locate the fault, eliminate the fault in a timely manner, and replace the fuse, thereby improving maintenance efficiency.

[0083] In an optional embodiment of the present disclosure, determining the fault location according to the location of the blown fuse in step 103 may specifically include:

[0084] When only the third-level fuse provided in the combiner cabinet is blown, it is determined that a short circuit fault occurs at the output end of the combiner cabinet;

[0085] When the third-level fuse provided in the combiner cabinet is blown, and the second-level fuses provided in the high-voltage boxes of the respective battery clusters are blown, it is determined that a short circuit fault occurs at the input end of the combiner cabinet;

[0086] When a second-level fuse provided in a high-voltage box of a first battery cluster is blown and a first-level fuse provided in at least one battery pack of the first battery cluster is blown, it is determined that a short circuit fault occurs in the first battery cluster.

[0087] As can be seen from the above description, the embodiments of the present disclosure can promptly detect and locate the position of a blown fuse and a short-circuit fault point by detecting the status of multiple fuses arranged in a hierarchical manner in the energy storage system, thereby reducing the maintenance workload of maintenance personnel and improving maintenance efficiency.

[0088] Since the principle of solving the problem by the above energy storage system fault detection method is similar to that of the above energy storage system, the embodiment of this method can be cross-referenced with the implementation of the above energy storage system, and the repeated parts will not be repeated.

[0089] See Figure 6, which is a block diagram of an electronic device according to one or more embodiments of this specification. As shown in Figure 6, the electronic device 500 may include a processor 501 and a memory 502; the memory 502 may be coupled to the processor 501. It is worth noting that Figure 6 is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunications or other functions. Alternatively, the electronic device 500 may be a device that performs battery management functions for an energy storage system.

[0090] In one possible implementation, the relevant functions of the battery management system of the energy storage system may be integrated into the processor 501. The processor 501 may be configured to perform the following operations:

[0091] Obtaining status information of each fuse in the energy storage system;

[0092] When it is determined according to the state information that any fuse is blown, generating first prompt information;

[0093] The location of the fault point is determined according to the location of the blown fuse, and a second prompt message is generated.

[0094] In addition, in some optional implementations, the electronic device 500 may further include: a communication module, an input unit, an audio processor, a display, a power supply, etc. It is worth noting that the electronic device 500 does not necessarily include all the components shown in Figure 6; in addition, the electronic device 500 may also include components not shown in Figure 6, and reference may be made to the prior art.

[0095] In some optional implementations, the processor 501 is sometimes also referred to as a controller or operation control, and may include a microprocessor or other processor device and / or logic device, which receives input and controls the operation of various components of the electronic device 500.

[0096] Memory 502 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned information related to the battery management system and may also store programs that execute the relevant information. Processor 501 may execute the programs stored in memory 502 to implement information storage or processing.

[0097] The input unit can provide input to the processor 501. The input unit can be, for example, a keypad or a touch input device. The power supply can be used to provide power to the electronic device 500. The display can be used to display objects such as images and text. The display can be, for example, an LCD display, but is not limited thereto.

[0098] The memory 502 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, or the like. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 502 may also be some other type of device. The memory 502 includes a buffer memory (sometimes referred to as a buffer). The memory 502 may include an application / function storage unit for storing application programs and function programs or processes for executing the operation of the electronic device 500 via the processor 501.

[0099] The memory 502 may also include a data storage unit for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit of the memory 502 may include various driver programs for the computer device for communication functions and / or for executing other functions of the computer device (such as a messaging application, a contact book application, etc.).

[0100] The embodiments of the present disclosure also provide a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the various processes of the above-mentioned energy storage system fault monitoring method embodiment are implemented and the same technical effects can be achieved. To avoid repetition, they are not described here.

[0101] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0102] An embodiment of the present disclosure further provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiments and can achieve the same technical effects. To avoid repetition, they will not be described here.

[0103] It should be understood that the chip mentioned in the embodiments of the present disclosure can also be called a system-level chip, a system chip, a chip system, or a system-on-chip chip, etc.

[0104] The various embodiments in this specification are described in a progressive manner. Similar portions between the various embodiments can be referenced to each other. Each embodiment focuses on the differences between the other embodiments. In particular, the device and system embodiments are generally similar to the method embodiments, so their descriptions are simplified. For relevant portions, refer to the descriptions of the method embodiments.

[0105] Although one or more embodiments of this specification provide method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative work. The order of steps listed in the embodiments is only one way of executing the steps among many steps and does not represent the only execution order. When an actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment).

[0106] In the description of this application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of this application. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on this application.

[0107] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0108] The present application has been described above in conjunction with preferred embodiments, but these embodiments are merely exemplary and serve only as an illustrative example. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. An energy storage system, characterized in that: include: Combiner cabinet; The output end of the combiner cabinet is connected to the DC side of the energy storage inverter; A plurality of battery clusters are connected in parallel to the input end of the combiner cabinet; The battery cluster includes a high-voltage box and a plurality of battery packs connected in series; The battery pack is provided with a first-level fuse, the high-voltage box is provided with a second-level fuse, and the combiner cabinet is provided with a third-level fuse; The pre-arc joule integral of the first-level fuse is greater than the total joule integral of the second-level fuse.

2. The energy storage system according to claim 1, characterized in that: The ratio between the pre-arcing joule integral of the first-level fuse and the total joule integral of the second-level fuse is not less than 1.5; The pre-arcing Joule integral of the plurality of the second-level fuses connected in parallel is greater than the total Joule integral of the third-level fuses; wherein the pre-arcing Joule integral of the plurality of the second-level fuses connected in parallel is N 2 *Q 21 ;Q 21 is the pre-arcing Joule integral of a single second-level fuse, and N is the number of the battery clusters.

3. The energy storage system according to claim 1, characterized in that: When a short circuit fault occurs at the output end of the combiner cabinet, the third-level fuse blows to protect the battery cluster; When a short circuit fault occurs at the input end of the combiner cabinet, the third-level fuse and the second-level fuse in each of the battery clusters are blown to protect the battery packs in the battery cluster; When a short circuit fault occurs in a first battery cluster among the multiple battery clusters, the second-level fuse in the high-voltage box in the first battery cluster blows, and the first-level fuse in at least one battery pack in the first battery cluster blows to protect other battery clusters outside the first battery cluster.

4. The energy storage system according to claim 1, characterized in that: At least one of the first-stage fuse, the second-stage fuse and the third-stage fuse is provided with a micro switch; the switching state of the micro switch changes with the fusing state of the corresponding fuse.

5. The energy storage system according to claim 4, characterized in that: It also includes a battery management system; the battery management system includes: a slave control unit, a master control unit and a master control unit; The slave control unit is used to obtain the first status information of the first-stage fuse through the micro switch and send it to the master control unit; The main control unit is used to obtain the second state of the second-level fuse through the micro switch. state information, and sending the second state information and the received first state information to the master control unit; The main control unit is used to obtain the third state information of the third-level fuse through the micro switch, receive the first state information and the second state information sent by the main control unit, and monitor the fault condition of the energy storage system according to the first state information, the second state information and the third state information.

6. A method for monitoring faults in an energy storage system, characterized in that: Applicable to the energy storage system according to any one of claims 1 to 5; the method comprises: Obtaining status information of each fuse in the energy storage system; When it is determined according to the state information that any fuse is blown, generating first prompt information; The location of the fault point is determined according to the location of the blown fuse, and a second prompt message is generated.

7. The method according to claim 6, characterized in that The first prompt information includes information about the location of the blown fuse; The second prompt information includes information representing the location of the fault point.

8. The method according to claim 6, characterized in that The method of determining the location of the fault point according to the location of the blown fuse includes: When only the third-level fuse arranged in the combiner cabinet is blown, it is determined that a short circuit fault occurs at the output end of the combiner cabinet; When the third-level fuses arranged in the combiner cabinet are blown, and the second-level fuses arranged in the high-voltage boxes of each battery cluster are blown, it is determined that a short circuit fault occurs at the input end of the combiner cabinet; When a second-level fuse disposed in a high-voltage box of a first battery cluster is blown and a first-level fuse disposed in at least one battery pack of the first battery cluster is blown, it is determined that a short circuit fault occurs in the first battery cluster.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 6 to 8 are implemented.

10. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 6 to 8.

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