Insulation detection device, energy storage equipment and power supply

Abstract

The utility model provides an insulation detection device, energy storage equipment and a power supply, and the device comprises a detection module and a judgment module, and the detection module is used for recognizing the short circuit phenomenon between a high-voltage box and a convergence control module and between the convergence control module and an energy storage converter based on a battery management system; and the judgment module is connected with the detection module, judges the short circuit phenomenon and transmits a judgment result to the battery management system, and the battery management system makes a response. Detection modules are arranged between a battery management system and a confluence control module and between the confluence control module and an energy storage converter, so that the short circuit phenomenon between a high-voltage box and the confluence control module and the short circuit phenomenon between the confluence control module and the energy storage converter are identified; the short circuit phenomenon is judged through the judgment module, the judgment result is transmitted to the battery management system in time, and the safety of new energy grid connection is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy storage technology, and particularly to an insulation detection device, an energy storage device and a power supply. BACKGROUND

[0002] With the increasing demand for grid connection of new energy, the existing energy storage power station is difficult to perform insulation detection between the battery management system and the bus control module and between the bus control module and the energy storage converter, which seriously affects the safe operation and maintenance of the energy storage power station.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical solutions of the present application and for the convenience of understanding by those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background section of the present application. CONTENT OF THE INVENTION

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

[0005] To this end, one object of the present application is to provide an insulation detection device arranged between an energy storage battery cabin and a converter voltage boosting cabin, wherein the energy storage battery cabin comprises a battery management system and a bus control module, the converter voltage boosting cabin comprises an energy storage converter and a communication power module, wherein the energy storage converter is connected to the battery management system and the bus control module, and the communication power module is connected to the bus control module, comprising:

[0006] a detection module for identifying a short circuit phenomenon between the high-voltage box and the bus control module and between the bus control module and the energy storage converter based on the battery management system;

[0007] a judgment module connected to the detection module, for judging the short circuit phenomenon and transmitting the judgment result to the battery management system, and the battery management system responds.

[0008] According to the insulation detection device of one embodiment of the present application, the detection module comprises a first detection unit, a second detection unit and a third detection unit, wherein the first detection unit is connected to the battery management system and is used to acquire the short circuit phenomenon of the high-voltage box through the battery management system, the second detection unit is connected to the bus control module and is used to acquire the short circuit phenomenon between the high-voltage box and the bus control module, and the third detection unit is connected to the energy storage converter and is used to acquire the short circuit phenomenon between the bus control module and the energy storage converter.

[0009] According to the insulation detection device of one embodiment of the present application, the first detection unit comprises a first acquisition subunit and a first adjustment subunit, wherein the first acquisition subunit is connected with the battery management system and the high-voltage box, and is configured to acquire the first voltage difference between the battery clusters; the first adjustment subunit is connected with the first acquisition subunit, and is configured to obtain the first insulation resistance value of the high-voltage box based on the value of the first voltage difference, and control the transmission of the electric energy of the high-voltage box.

[0010] According to the insulation detection device of one embodiment of the present application, the second detection unit comprises a second acquisition subunit and a second adjustment subunit, wherein the second acquisition subunit is connected with the bus control module, and is configured to acquire the hot standby state parameter of the battery cluster; the second adjustment subunit is connected with the second acquisition subunit, and is configured to obtain the second insulation resistance value between the high-voltage box and the bus control module based on the hot standby state parameter, and control the transmission of the electric energy between the high-voltage box and the bus control module.

[0011] According to the insulation detection device of one embodiment of the present application, the third detection unit comprises a third acquisition subunit and a third adjustment subunit, wherein the third acquisition subunit is connected with the energy storage converter, and is configured to acquire the second voltage difference between the energy storage converter and the bus control module; the third adjustment subunit is connected with the third acquisition subunit, and is configured to obtain the third insulation resistance value between the bus control module and the energy storage converter based on the value of the second voltage difference, and control the transmission of the electric energy between the bus control module and the energy storage converter.

[0012] According to the insulation detection device of one embodiment of the present application, the judgment module comprises a pattern recognition unit, a query unit and a communication unit, wherein the pattern recognition unit is connected with the detection module, and is configured to recognize the working condition of the battery cluster, wherein the working condition comprises a power-on working condition and a power-off working condition; the query unit is connected with the pattern recognition unit, and is configured to count the short-circuit phenomenon; and the communication unit is connected with the query unit, and is configured to transmit the judgment result.

[0013] Another object of the present application is to provide an energy storage device comprising the insulation detection device provided by the present application.

[0014] Still another object of the present application is to provide a power supply comprising the energy storage device provided by the present application.

[0015] In the application, detection modules are arranged between the battery management system and the bus control module and between the bus control module and the energy storage converter, so as to identify short circuit phenomena between the high-voltage box and the bus control module and between the bus control module and the energy storage converter; the short circuit phenomena are determined by the judgment module, and the determination result is transmitted to the battery management system in time, so that the safety of new energy grid connection is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure diagram of the insulation detection device provided by the embodiment of the application is shown in

[0017] Figure 2 An electrical topology diagram of the insulation detection device provided by the embodiment of the application is shown in DETAILED DESCRIPTION

[0018] The embodiments of the application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0019] The insulation detection device, the energy storage device and the power supply of the embodiment of the application are described below in combination with the drawings.

[0020] Figure 1 A structure diagram of the insulation detection device provided by the embodiment of the application is shown in Figure 1As shown, the insulation detection device of the embodiment of the present application is arranged between the energy storage battery cabin and the current conversion and voltage boosting cabin. The energy storage battery cabin includes a battery management system and a bus control module (the battery management system is full name Battery Management System, abbreviated as BMS. The BMS and the bus control module play an important role in battery management and direct current power distribution. In the energy storage system, the BMS and the bus control module work together. The BMS is responsible for monitoring and controlling the state of the battery cluster, while the bus control module is responsible for the current collection and distribution of the battery cluster to achieve effective management of the entire energy storage system. The battery data collected by the BMS can be transmitted to the bus control module through the communication interface to monitor and schedule the entire system more comprehensively), and the current conversion and voltage boosting cabin includes a power conversion system and a communication power module (the power conversion system is full name Power Conversion System, abbreviated as PCS. It is responsible for controlling the charging and discharging conditions of the energy storage battery pack and converting AC and DC to achieve the adjustment of active power and reactive power of the power grid. The communication power module is used to provide power supply and signal transmission. The power conversion system and the communication power module include electrical connection and communication connection between them. The connection mode should comply with relevant safety specifications and standards), wherein the power conversion system is connected with the battery management system and the bus control module; the communication power module is connected with the bus control module, including a detection module and a judgment module.

[0021] In a feasible implementation manner, as shown in Figure 1 The detection module can be used to identify the short circuit phenomenon between the high-voltage box and the bus control module based on the identification of the battery management system, and can also be used to identify the short circuit phenomenon between the bus control module and the power conversion system; and the judgment module is connected with the detection module, further judges whether the short circuit phenomenon identified by the detection module needs to be abnormally warned, and then transmits the result of the judgment to the battery management system for response. If the result of the judgment needs to be abnormally warned, the battery management system links the power conversion system for fault shutdown; if the result of the judgment does not need to be abnormally warned, the battery management system and the power conversion system maintain the ongoing working condition.

[0022] Optionally, Figure 2 The electrical topology of the insulation detection device provided by the embodiment of the present application is shown in Figure 2As shown, the detection module can include a first detection unit, a second detection unit and a third detection unit, wherein the first detection unit is connected with the battery management system, and is used to obtain the short circuit phenomenon of the high-voltage box through the battery management system, wherein the high-voltage box is mainly used for high-voltage cable connection, power distribution and control, and the high-voltage box and the battery management system can be connected in a power line connection mode or a sampling line connection mode, and the high-voltage box includes a direct-current circuit breaker QF2, a circulating current contactor KM2, a circulating current resistor R2, a positive and negative main contactor KM3 and a third direct-current fuse FU3; the second detection unit is connected with the bus control module, and is used to obtain the short circuit phenomenon between the high-voltage box and the bus control module, and the bus control module includes a second direct-current fuse FU2 and a second direct-current disconnector QL2 with load breaking capacity; the third detection unit is connected with the energy storage converter, and is used to obtain the short circuit phenomenon between the bus control module and the energy storage converter, and the energy storage converter includes an alternating-current circuit breaker QF1, a first direct-current disconnector QL1 with load breaking capacity, a pre-charge resistor R1, a pre-charge contactor KM1 and a first direct-current fuse FU1.

[0023] Further, as shown in Figure 2 , the first detection unit includes a first acquisition subunit and a first adjustment subunit, wherein the first acquisition subunit and the first adjustment subunit are not shown in Figure 2 , the first acquisition subunit is connected with the battery management system, and is used to collect the first voltage difference between the battery clusters; the first adjustment subunit is connected with the first acquisition subunit and the high-voltage box, and based on the value of the first voltage difference, the first insulation resistance value of the high-voltage box is obtained, and the power transmission of the high-voltage box is controlled.

[0024] Further, as shown in Figure 2 , the second detection unit includes a second acquisition subunit and a second adjustment subunit, wherein the second acquisition subunit and the second adjustment subunit are not shown in Figure 2 , the second acquisition subunit is connected with the bus control module, and is used to collect the hot standby state parameter of the battery cluster; the second adjustment subunit is connected with the second acquisition subunit, and based on the hot standby state parameter, the second insulation resistance value between the high-voltage box and the bus control module is obtained, and the power transmission between the battery management system and the bus control module is controlled.

[0025] Further, as shown in Figure 2 , the third detection unit includes a third acquisition subunit and a third adjustment subunit, wherein the third acquisition subunit and the third adjustment subunit are not shown in Figure 2As shown, the third acquisition subunit is connected to the energy storage converter and is used to acquire the second voltage difference between the energy storage converter and the combiner control module; the third adjustment subunit is connected to the third acquisition subunit and, based on the value of the second voltage difference, obtains the third insulation resistance value between the combiner control module and the energy storage converter, and controls the power transmission between the combiner control module and the energy storage converter.

[0026] As an example, such as Figure 2 As shown, when the high-voltage box is powered on, the DC circuit breaker QF2 is closed. If the Battery Cluster Management Unit (BCU) in the BMS detects the feedback signal from the DC circuit breaker QF2, the self-test passes, and then the battery cluster insulation test is performed. The positive and negative main contactors KM3 consist of a positive main contactor and a negative main contactor. When the negative main contactor in KM3 is closed, the battery cluster insulation test stops. The closing of the circulating current contactor KM2 is determined based on the following conditions: If the first voltage difference between battery clusters is less than a first threshold (which can be 10V), then KM2 is closed directly. If the first voltage difference between battery clusters is greater than or equal to the first threshold and less than a second threshold (which can be 20V), then KM2 is closed, and the BMS can then perform inter-cluster circulating current balancing on all battery clusters until the first voltage difference between battery clusters is less than the first threshold. If the first voltage difference between battery clusters is greater than or equal to the second threshold, it indicates a power failure in the battery pack within the energy storage compartment, and KM2 is no longer closed; in this case, manual intervention is required for maintenance. Simultaneously, the first insulation resistance value of the high-voltage box is obtained based on the value of the first voltage difference.

[0027] like Figure 2 As shown, when the condition of the first voltage difference between battery clusters < the first threshold is met, the hot standby status parameters of the battery clusters are collected based on the second detection unit. After the circulating contactor KM2 is closed for the first cycle (e.g., the first cycle can be 5s), the circulating contactor KM2 is opened after a second cycle (e.g., the second cycle can be 2s), thereby completing the hot standby status of the battery clusters. The second detection unit collects hot standby status parameters related to the hot standby status, such as battery temperature, battery voltage, and battery charge. The hot standby status enables the battery clusters to quickly enter the operating state when needed. Then, the second DC disconnect switch QL2 in the busbar control module is closed (e.g., the second DC disconnect switch QL2 can first perform opening and then closing), thus completing the power-on process on the DC side and completing the hot standby status of the battery clusters. At the same time, based on the hot standby status parameters, the second insulation resistance value between the high-voltage box and the busbar control module is obtained.

[0028] likeFigure 2 As shown, when the DC side completes the power-on process, the energy storage converter initiates a self-test. After the self-test shows no abnormalities, the BMS issues a start command to the energy storage converter and closes the pre-charge contactor KM1 to charge the DC bus capacitor (wherein, the DC bus capacitor is not yet charged). Figure 2 (Demonstration); After the DC bus capacitor is fully charged, the first DC disconnect switch QL1 is closed, and the pre-charge contactor KM1 is opened at the same time; then the AC circuit breaker QF1 is closed, and the energy storage converter enters the standby state, waiting for power commands. At the same time, the second voltage difference between the energy storage converter and the bus control module is collected. Based on the value of the second voltage difference, the third insulation resistance value between the bus control module and the energy storage converter is obtained.

[0029] Furthermore, such as Figure 1 As shown, when the DC side is powered down, the BMS disconnects the second DC disconnect switch QL2 through the main control unit; based on the open state of the second DC disconnect switch QL2, the BMS disconnects the positive and negative main contactors KM3 in the high voltage box through the battery cluster management unit BCU (both the positive and negative main contactors are disconnected), the energy storage converter enters the standby state, and enters the shutdown state by disconnecting the AC circuit breaker QF1 and the first DC disconnect switch QL1.

[0030] However, potential drawbacks of the energy storage converter during power-off include: the need to detect the status of the second DC disconnect switch QL2 before executing the next command, without considering the possibility that the second DC disconnect switch QL2 might stick and fail to disconnect, which could lead to prolonged overload of the battery pack and increase safety hazards; if the DC circuit breaker QF2 fails to trip, and the positive and negative main contactors KM3 also stick, power to the battery pack cannot be disconnected. Improvements to these drawbacks are as follows:

[0031] If an alarm occurs in the battery cluster, the BMS sends a communication signal and a dry contact emergency stop signal to the energy storage converter, and sends a trip command to the second DC disconnect switch QL2; a trip control circuit is added to the DC circuit breaker QF2. If the open state of the positive and negative main contactors KM3 is not detected, the trip operation of the DC circuit breaker QF2 is realized through this trip control circuit; the BMS records the number of load operations of the bus control module, the precharge contactor KM1, the circulating current contactor KM2, and the positive and negative main contactors KM3. When the number of load operations reaches the warning value, the BMS issues a warning. Based on the warning, the BMS links the energy storage converter to perform a fault shutdown.

[0032] Optionally, such as Figure 2 and ​As shown, the judging module of the insulation detection device includes a mode recognition unit, a query unit and a communication unit. The mode recognition unit is connected with the detection module and is configured to recognize the working condition of the battery cluster, where the working condition includes a power-on working condition and a power-off working condition. The query unit is connected with the mode recognition unit and is configured to count the short-circuit phenomenon. The communication unit is connected with the query unit and is configured to transmit the determination result. Further, the query unit counts the short-circuit phenomenon in a polling manner. When the counted short-circuit phenomenon appears continuously for a plurality of times (for example, 3 times), the BMS links the energy storage converter to stop running. The communication protocol used by the communication unit includes a CAN bus protocol and an RS485 protocol. Specifically, the communication protocol should be set according to the use scenario, which will not be described herein.

[0033] In particular, according to the embodiments of the present application, the insulation detection device described above can be implemented as an energy storage device, which can acquire the short-circuit phenomenon of the high-voltage box, the short-circuit phenomenon between the high-voltage box and the bus control module, and the short-circuit phenomenon between the bus control module and the energy storage converter, and determine the short-circuit phenomenon through the judging module, and timely transmit the determination result to the battery management system, thereby greatly improving the safety of new energy grid connection.

[0034] In particular, according to the embodiments of the present application, the energy storage device described above can be implemented as a power supply, which greatly improves the safety and stability of energy storage operation, and has wide application value.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 present 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 limiting the present application.

[0036] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise specifically limited.

[0037] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the 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 appropriate manner in any one or more embodiments or examples. In addition, those 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.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An insulation detection device, arranged between an energy storage battery cabin and a current conversion and voltage boosting cabin, the energy storage battery cabin comprising a battery management system and a busbar control module, the current conversion and voltage boosting cabin comprising an energy storage current converter and a communication power module, wherein, The energy storage converter is connected with the battery management system and the busbar control module; the communication power module is connected with the busbar control module, characterized in that comprising: a detection module, which is used for identifying the short circuit phenomenon between the high-voltage box and the busbar control module and between the busbar control module and the energy storage converter based on the battery management system; a judgment module connected with the detection module, which is used for judging the short circuit phenomenon and transmitting the judgment result to the battery management system for response.

2. The insulation detection device according to claim 1, characterized by The detection module comprises a first detection unit, a second detection unit and a third detection unit, wherein the first detection unit is connected with the battery management system and is used for acquiring the short circuit phenomenon of the high-voltage box through the battery management system; the second detection unit is connected with the busbar control module and is used for acquiring the short circuit phenomenon between the high-voltage box and the busbar control module; and the third detection unit is connected with the energy storage converter and is used for acquiring the short circuit phenomenon between the busbar control module and the energy storage converter.

3. The insulation detection device according to claim 2, characterized in that, The first detection unit comprises a first acquisition subunit and a first adjustment subunit, wherein the first acquisition subunit is connected with the battery management system and the high-voltage box and is used for acquiring the first voltage difference between the battery clusters; and the first adjustment subunit is connected with the first acquisition subunit and is used for acquiring the first insulation resistance value of the high-voltage box based on the value of the first voltage difference and controlling the transmission of the electric energy of the high-voltage box.

4. The insulation detection device according to claim 2, characterized by The second detection unit comprises a second acquisition subunit and a second adjustment subunit, wherein the second acquisition subunit is connected with the busbar control module and is used for acquiring the hot standby state parameter of the battery cluster; and the second adjustment subunit is connected with the second acquisition subunit and is used for acquiring the second insulation resistance value between the high-voltage box and the busbar control module based on the hot standby state parameter and controlling the transmission of the electric energy between the high-voltage box and the busbar control module.

5. The insulation detection device of claim 2, wherein The third detection unit comprises a third acquisition subunit and a third adjustment subunit, wherein the third acquisition subunit is connected with the energy storage converter and is used for acquiring the second voltage difference between the energy storage converter and the busbar control module; and the third adjustment subunit is connected with the third acquisition subunit and is used for acquiring the third insulation resistance value between the busbar control module and the energy storage converter based on the value of the second voltage difference and controlling the transmission of the electric energy between the busbar control module and the energy storage converter.

6. The insulation detection device according to any one of claims 1 to 5, characterized in that, The judgment module comprises a pattern recognition unit, a query unit and a communication unit, wherein the pattern recognition unit is connected with the detection module and is used for identifying the working condition of the battery cluster, wherein the working condition comprises the power-on working condition and the power-off working condition; the query unit is connected with the pattern recognition unit and is used for counting the short circuit phenomenon; and the communication unit is connected with the query unit and is used for transmitting the judgment result.

7. The insulation detection device according to claim 6, characterized in that The query unit counts the short circuit phenomenon in a polling manner.

8. The insulation detection device of claim 6, wherein The communication protocol used by the communication unit comprises the CAN bus protocol and the RS485 protocol.

9. An energy storage device, characterized by, The energy storage device comprises the insulation detection apparatus according to any one of claims 1-8.

10. A power supply, characterized by, The power supply comprises the energy storage device according to claim 9.

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