An energy storage battery system and masterless insulation detection method

Abstract

The application discloses a kind of energy storage battery system and ownerless insulation detection method, belong to the related technical field of intelligent energy storage system.The application applies a kind of ownerless insulation detection logic strategy in energy storage battery system, ownerless insulation detection logic strategy includes battery cluster management unit BCU battery cluster on high voltage closing input flow, battery cluster management unit BCU under high voltage opening exit flow.Each battery cluster of the application has separate insulation detection function, by applying insulation detection logic algorithm in battery cluster management unit BCU in parallel cluster energy storage battery system, the real-time online detection function of each cluster insulation fault in entire energy storage battery system can be realized.Meanwhile, the application does not interfere with each other in the working process of energy storage battery system The insulation of battery cluster can be guaranteed The insulation safety of entire energy storage battery system, improve the reliability, stability and safety of entire energy storage system operation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of intelligent energy storage systems, in particular to an energy storage battery system and a masterless insulation detection method. BACKGROUND

[0002] With the rapid development of power storage systems, the energy storage battery system contains batteries, battery leakage and the risk of positive and negative electrode insulation damage, which causes excessive system leakage current and risks. Industrial and commercial and large energy storage container energy storage battery systems generally adopt a multi-cluster battery cluster parallel common DC bus system scheme. In this application scenario, as the system cluster size increases, the system insulation becomes more complex. How to accurately locate the position of the entire energy storage system insulation fault and avoid the risk of large current caused by the low positive and negative electrode insulation impedance of the entire system DC bus to the ground is a key problem that needs to be considered from a technical point of view.

[0003] Therefore, it is necessary to adopt a suitable detection method for insulation detection of the energy storage battery system in this application scenario to meet the insulation detection needs of industrial and commercial and large energy storage battery systems. It is particularly important to think and solve how to provide an insulation detection method that can effectively perform insulation detection on the entire system, ensure that the insulation of each battery cluster does not interfere with each other, ensure the real-time insulation safety of the entire energy storage battery system, accurately locate the position of the insulation fault of the abnormal battery cluster, and improve the reliability, stability and safety of the entire energy storage battery system. SUMMARY

[0004] To solve the existing technical problems, the application provides an energy storage battery system and a masterless insulation detection method. The energy storage battery system includes at least two parallel battery clusters, the battery cluster is composed of cell modules in series and parallel, each battery cluster is provided with a battery management system BMS and a high-voltage box, the battery management system BMS includes at least one battery stack management unit BAU, the battery stack management unit BAU coordinates and manages at least two battery cluster management units BCU, and the battery cluster management unit BCU coordinates and manages at least one battery module unit BMU.

[0005] Preferably or optionally, the battery management system BMS, the battery stack management unit BAU and the battery cluster management unit BCU are connected through the same link to form a cluster communication.

[0006] Preferably or optionally, the single battery cluster is connected to the insulation detection module and is one-to-one matched and bound.

[0007] Preferably or optionally, the battery clusters communicate with each other through the establishment of a communication link matching and cluster communication protocol, and the communication interaction mode includes RS485, CAN, CAN-FD, and Ethernet communication.

[0008] Preferably or optionally, the cluster high-voltage box includes a high-voltage circuit, an insulation detection module, and a relay program-controlled switch execution unit, and the relay program-controlled switch execution unit has a DC high-voltage closing and opening control function.

[0009] Preferably or optionally, the battery cluster management unit BCU is one-to-one matched and bound with the high-voltage circuit and the insulation detection module.

[0010] Preferably or optionally, each battery cluster has an independent number, and the battery clusters also have different priority orders, and the priority order is the same as the order of the battery clusters.

[0011] A masterless insulation detection method for an energy storage battery system, comprising:

[0012] The battery stack management unit BAU does not have an insulation detection function and does not participate in the insulation detection logic strategy.

[0013] The battery module unit BMU does not have an insulation detection function and does not participate in the insulation detection logic strategy.

[0014] The insulation detection module is controlled by the battery cluster management unit BCU, and the battery cluster management unit BCU can control the opening or closing of the insulation detection function.

[0015] The multiple system battery cluster management units BCU coordinate with each other to implement the multi-cluster masterless insulation detection logic strategy.

[0016] Preferably or optionally, when the battery cluster appears to be closed or opened, the battery cluster management unit BCU will execute a masterless insulation detection arbitration mechanism for arbitration once, and the battery cluster management unit BCU will switch to a battery cluster with high priority according to the priority to perform insulation detection of the entire energy storage battery system.

[0017] Preferably or optionally, the battery cluster management unit BCU combines the system battery stack BAU power-on and power-off control and the insulation detection switching logic strategy in the communication interruption or communication recovery process between multiple battery clusters.

[0018] Beneficial effects: the application applies a masterless insulation detection logic in the energy storage battery system, the masterless insulation detection logic strategy includes the high voltage closing input process of the battery cluster management unit BCU on the battery cluster and the high voltage opening exit process of the battery cluster management unit BCU. Each battery cluster of the application has a separate insulation detection function, and through the application of the insulation detection logic algorithm in the battery cluster management unit BCU in the parallel cluster energy storage battery system, the real-time online detection function of each cluster insulation fault in the entire energy storage battery system can be realized. At the same time, the insulation of each battery cluster in the energy storage battery system does not interfere with each other during the working process, which can ensure the insulation safety of the entire energy storage battery system and improve the reliability, stability and safety of the entire energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The block diagram of the energy storage battery system of the application is shown in the figure;

[0020] Figure 2 The high voltage closing input process diagram of the battery cluster management unit BCU of the application is shown in the figure;

[0021] Figure 3 The high voltage opening exit process diagram of the battery cluster management unit BCU of the application is shown in the figure. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are given to provide a more thorough understanding of the application. However, it is obvious to those skilled in the art that the application can be implemented without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid obscuring the application.

[0023] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0024] The application will be further described below in conjunction with examples, and the examples of the described embodiments are intended to explain the application, but cannot be understood as a limitation on the application.

[0025] Figure 1For the energy storage battery system block diagram of the application, each battery cluster is provided with a battery management system BMS and a high-voltage box, the battery management system BMS includes at least one battery stack management unit BAU, the battery stack management unit BAU coordinately manages and controls at least two battery cluster management units BCU, and the battery cluster management unit BCU coordinately manages at least one battery module unit BMU.

[0026] Embodiment 1

[0027] The energy storage system of the embodiment includes a 3-battery cluster parallelly connected 3-battery cluster energy storage battery system, each battery cluster contains a set of battery management system BMS (containing 1 battery stack management unit BAU and 3 battery cluster management units BCU), a high-voltage box (containing a high-voltage circuit and an insulation detection module), and a battery module composed of a cell module and a battery module management BMU. The communication between the battery stack control unit BAU and the 3 battery cluster control units BCU is carried out through CAN communication, and the CAN communication protocol adopts a standard frame protocol or an extended frame protocol.

[0028] The battery cluster management unit BCU of the embodiment controls the battery module control unit BMU and the insulation detection module under the battery, and coordinates the high-voltage circuit to operate the high-voltage switching operation and the cluster insulation detection function.

[0029] When the battery management system BMS of the 3 battery clusters is started, the self-inspection insulation logic in the battery cluster control unit BCU is executed, the system battery cluster management unit BCU high-voltage closing investment flow logic strategy is put into operation as shown in Figure 2 , including the following steps:

[0030] Step S101: all battery clusters start the insulation detection function before the high-voltage is turned on, and jump to step S102;

[0031] Step S102: judge whether each battery cluster has insulation detection failure, if all battery clusters have no insulation failure, jump to S105, otherwise jump to step S103;

[0032] Step S103: the battery cluster has insulation failure, the battery cluster control unit BCU of the battery cluster with insulation failure prohibits the high-voltage closing of the fault cluster, and records the insulation fault position, insulation resistance value, fault threshold value information to the battery cluster control unit BCU, synchronously reports to the battery stack management unit BAU through the communication link, and then jumps to step S104;

[0033] Step S104: each battery stack management unit BAU knows each other through broadcasting, judges whether all battery clusters have insulation failure, if all battery clusters have failure, exits the whole process, otherwise jumps to step S105;

[0034] Step S105: The battery cluster with normal insulation detection waits to receive the upper high-voltage closing instruction sent by the battery stack management unit BAU to perform cluster power-on, if the upper high-voltage closing instruction of the battery stack management unit BAU is not received, the corresponding battery cluster is in the waiting high-voltage state, if the upper high-voltage closing instruction of the battery stack management unit BAU is received, the step S106 is jumped to;

[0035] Step S106: The cluster receiving the upper high-voltage closing instruction closes the insulation function of the current cluster and jumps to step S107;

[0036] Step S107: The battery cluster enters the masterless insulation detection arbitration mechanism process, and the cluster broadcasts the arbitration synchronization insulation state data packet to the communication bus through the communication link, and other clusters perform insulation detection arbitration according to the arbitration mechanism process.

[0037] The system battery cluster management unit BCU battery cluster low-voltage opening exit process logic strategy, as shown in Figure 3 , including the following steps:

[0038] Step S201: The battery cluster with normal insulation is in arbitration or timing round-robin for timing and time-sharing switching insulation detection, and jumps to step S202;

[0039] Step S202: The battery cluster with normal insulation waits to receive the lower high-voltage opening instruction sent by the upper battery stack management unit BAU to perform cluster low-voltage power opening, if the lower high-voltage opening instruction is not received by the battery cluster, it continues to wait, if the lower high-voltage opening instruction is received by the battery cluster, it jumps to step S203;

[0040] Step S203: The battery cluster judges whether the current low-voltage battery cluster is in the insulation detection state, if the low-voltage cluster is in the insulation detection state, it jumps to step S204, if the low-voltage cluster is not in the insulation detection state, it jumps to step S205;

[0041] Step S204: Other non-powered battery clusters perform arbitration mechanism logic insulation detection switching process;

[0042] Step S205: Other non-powered battery clusters perform timing round-robin insulation detection switching process.

[0043] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present application.

Claims

1. A method for ownerless insulation detection of an energy storage battery system, characterized in that, The energy storage battery system includes at least two battery clusters connected in parallel. Each battery cluster is composed of cell modules connected in series and parallel. Each battery cluster is equipped with a battery management system (BMS) and a high-voltage box. The battery management system (BMS) includes at least one battery stack management unit (BAU). The battery stack management unit (BAU) coordinates and manages at least two battery cluster management units (BCUs). The battery cluster management unit (BCU) coordinates and manages at least one battery module unit (BMU). The detection method includes: The battery stack management unit (BAU) does not have insulation detection function and does not participate in the insulation detection logic strategy; The battery module unit (BMU) does not have insulation detection function and does not participate in the insulation detection logic strategy. The insulation detection module is controlled by the battery cluster management unit (BCU), which controls whether the insulation detection function is turned on or off. Multiple battery cluster management units (BCUs) coordinate with each other to implement a multi-cluster masterless insulation detection logic strategy. The logic strategy for the high-voltage closing and connection process of the battery cluster management unit (BCU) includes the following steps: Step S101: Before applying high voltage to all battery clusters, activate the insulation detection function and proceed to step S102. Step S102: Determine whether each battery cluster has an insulation detection fault. If all battery clusters have no insulation fault, proceed to S105; otherwise, proceed to step S103. Step S103: If there is an insulation fault in the battery cluster, the battery cluster management unit (BCU) with the insulation fault will prohibit the high voltage from closing on the faulty cluster. At the same time, the location of the insulation fault, the resistance value of the insulation resistance, and the fault threshold information will be recorded in the battery cluster management unit (BCU) and reported to the battery stack management unit (BAU) through the communication link before jumping to step S104. Step S104: Each battery stack management unit (BAU) informs each other via broadcast and determines whether all battery clusters have insulation faults. If all battery clusters have faults, the entire process is terminated; otherwise, the process proceeds to step S105. Step S105: Battery clusters with normal insulation detection wait to receive the high-voltage closing command sent by the upper battery stack management unit (BAU) to power on the cluster. If the high-voltage closing command is not received from the battery stack management unit (BAU), the corresponding battery cluster is in the waiting state for high voltage. If the high-voltage closing command is received from the battery stack management unit (BAU), the process jumps to step S106. Step S106: After receiving the high-voltage closing command, the battery cluster that has received the command will turn off the insulation function of the current battery cluster and then proceed to step S107. Step S107: The battery cluster enters the masterless insulation detection arbitration mechanism process. The battery cluster broadcasts the arbitration synchronization insulation status data message to the communication bus through the communication link. Other battery clusters arbitrate the right to conduct insulation detection according to the arbitration mechanism process.

2. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, The battery management system (BMS), battery stack management unit (BAU), and battery cluster management unit (BCU) are connected by the same link, forming a clustered communication system.

3. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, The battery cluster also includes an insulation detection module, and each battery cluster is connected to and matched with the insulation detection module.

4. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, The battery clusters communicate with each other by establishing a communication link and a matching cluster communication protocol. The communication methods include RS485, CAN, CAN-FD, and Ethernet communication.

5. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, The high-voltage box includes a high-voltage electrical circuit, an insulation detection module, and a relay programmable switch execution unit. The relay programmable switch execution unit has DC high-voltage closing and opening control functions.

6. The ownerless insulation detection method for an energy storage battery system according to claim 5, characterized in that, The battery cluster management unit (BCU) is matched and bound to the high-voltage electrical circuit and the insulation detection module one by one.

7. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, Each of the battery clusters has a unique number, and the battery clusters also have different priority orders, with the priority order being the same as the order of the battery clusters.

8. The ownerless insulation detection method for an energy storage battery system according to claim 7, characterized in that, When a battery cluster is switched on or off, the masterless insulation detection logic strategy will execute the masterless insulation detection arbitration mechanism to conduct an arbitration. The battery cluster management unit (BCU) will switch to the battery cluster with higher priority according to the priority order to perform the overall insulation detection of the energy storage battery system.

9. The ownerless insulation detection method for an energy storage battery system according to claim 1, characterized in that, The battery cluster management unit (BCU) combines the power-on / off control of the system battery stack management unit (BAU) with the insulation detection switching logic strategy during communication interruption or communication recovery between multiple battery clusters.

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