Energy storage system, insulation detection method for energy storage system, and power source apparatus

Abstract

An energy storage system, an insulation detection method for an energy storage system, and a power source apparatus. In the energy storage system, battery assemblies (11) and supporting members (12) are arranged insulated from each other; the supporting members (12) are respectively connected to an electrically conductive path (13) by means of a plurality of branches, and when insulation failures of more than one supporting member (12) occur, that is, when insulation failures occur in more than one point in the supporting members (12), a short-circuit current caused by the insulation failures is borne by means of the electrically conductive path (13), and the impedance of the electrically conductive path (13) can be set to suppress the short-circuit current, so as to achieve a short-circuit protection function, thereby reducing the possibility of causing high-voltage arcing and combustion and explosion of a battery; in addition, an insulation detection circuit (14) is also provided, so as to perform detection on an insulation parameter of the energy storage system, thereby reducing the possibility of the battery assemblies (11) operating in an insulation failure state for a long term.

Description

Energy storage system, insulation detection method for energy storage system, and power supply device

[0001] This application claims priority to the Chinese patent application with application number 202323118929.8, filed on November 20, 2023, and with the invention name “Energy Storage Circuit and Power Supply Device”, and this application claims priority to the international patent application with application number PCT / CN2023 / 129688, filed on November 3, 2023, and with the invention name “Energy Storage Circuit and Power Supply Device”, the entire contents of which are incorporated into this application by reference. Technical Field

[0002] The present application belongs to the field of power supply technology, and in particular relates to an energy storage system, an insulation detection method for the energy storage system, and a power supply device. Background Art

[0003] The relevant energy storage system includes multiple battery packs connected in series and / or in parallel. Its short-circuit protection method is to set a fuse at the positive or negative pole of the energy storage system, or to set a fuse inside each battery pack. These two methods can only reduce the possibility of serious safety failures such as battery combustion and explosion in the event of a short circuit between the positive and negative poles of the energy storage system. However, in the event of a double-point insulation failure across the electrical box (support), that is, when insulation failure occurs in two electrical boxes, the voltage difference is high and the short-circuit current is extremely large, which can easily cause serious safety problems such as high-voltage ignition and battery combustion and explosion. Therefore, the relevant energy storage system cannot reduce the safety risk in the event of a double-point insulation failure across the electrical box.

[0004] Application Contents

[0005] In view of the above problems, the present application provides an energy storage system, an insulation detection method for the energy storage system, and a power supply device, aiming to solve the problem that the relevant energy storage system cannot reduce the safety risk in the event of double-point insulation failure across the electrical box.

[0006] In a first aspect, an embodiment of the present application provides an energy storage system, comprising a total positive line, a total negative line, and a battery module connected between the total positive line and the total negative line, wherein the energy storage system is configured to output electrical energy from the battery module through the total positive line and the total negative line, and / or the energy storage system is configured to input electrical energy to the battery module through the total positive line and the total negative line;

[0007] The battery module includes M battery assemblies connected in series;

[0008] The energy storage system further includes N supporting members, the M battery assemblies are supported by the N supporting members, and the M battery assemblies are insulated from the N supporting members;

[0009] The energy storage system further includes a conductive path, wherein K support members among the N support members are connected to the conductive path through K branches, respectively, where M, N, and K are all positive integers, and M≥N≥K>1;

[0010] The energy storage system further includes an insulation detection circuit connected to the total positive line and the total negative line, and configured to detect insulation parameters of the energy storage system.

[0011] In the technical solution of the embodiment of the present application, based on the insulation setting of the battery assembly and the support member, K support members out of the N support members are respectively connected to the conductive path through K branches. In the event of insulation failure of more than one electrical box (or support member), that is, in the event of insulation failure of more than one support member, the short-circuit current of the support member with insulation failure is borne by the conductive path. The impedance of the conductive path can be configured to suppress the short-circuit current, thereby playing a short-circuit protection role and reducing the possibility of high-voltage ignition and battery combustion and explosion; in addition, an insulation detection circuit is also provided to detect the insulation parameters of the energy storage system, reducing the possibility of the battery assembly operating for a long time with insulation failure.

[0012] In some embodiments, the insulation detection circuit includes a first detection switch, a second detection switch, a first reference resistor, and a second reference resistor;

[0013] A first end of the first reference resistor is connected to the main positive line through a first detection switch;

[0014] A first end of the second reference resistor is connected to the total negative line through a second detection switch;

[0015] The second end of the first reference resistor and the second end of the second reference resistor are commonly connected to the electrical platform.

[0016] In the technical solution of the embodiment of the present application, a detection topology for the insulation parameters of an energy storage system is provided, which uses a detection switch to control the connection of a reference resistor to the energy storage system, and calculates the insulation parameters of the energy storage system by detecting relevant electrical parameters on the reference resistor.

[0017] In some embodiments, the insulation detection circuit further includes a third reference resistor, a fourth reference resistor, a fifth reference resistor, and a sixth reference resistor;

[0018] The third reference resistor and the fourth reference resistor are connected in series between the total positive line and the electric platform; the fifth reference resistor and the sixth reference resistor are connected in series between the total negative line and the electric platform.

[0019] In the technical solution of the embodiment of the present application, another topology for detecting the insulation parameters of an energy storage system is provided, which uses a detection switch to control the connection of a reference resistor to the energy storage system, and calculates the insulation parameters of the energy storage system by detecting the relevant electrical parameters on the reference resistor.

[0020] In some embodiments, the first end of the conductive path is connected to the first end of the first reference resistor, and the second end of the conductive path is connected to the first end of the second reference resistor.

[0021] In the technical solution of the embodiment of the present application, a connection method of a conductive path is provided that can cooperate with the detection of the insulation parameters of the energy storage system, so that the energy storage system can not only solve the insulation failure of more than one electrical box, but also detect the insulation parameters of the energy storage system.

[0022] In some embodiments, the system further includes a first switch and a second switch, wherein the first end of the conductive path is connected to the total positive line through the first switch, and the second end of the conductive path is connected to the total negative line through the second switch.

[0023] In the technical solution of the embodiment of the present application, another connection method of the conductive path is provided that can cooperate with the detection of the insulation parameters of the energy storage system, so that the energy storage system can not only solve the insulation failure of more than one electrical box, but also detect the insulation parameters of the energy storage system.

[0024] In some embodiments, a protection component is provided on the conductive path and / or branch.

[0025] In the technical solution of the embodiment of the present application, based on the insulation setting of the battery assembly and the support member, the conductive path includes K nodes connected in series, and K support members out of N support members are respectively connected to the K nodes through K branches. In the case of insulation failure of more than one electrical box (support member), that is, when insulation failure occurs at more than one point in the support member, the short-circuit current caused by the insulation failure can be borne by the protective component on the conductive path, thereby playing a short-circuit protection role and reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0026] In some embodiments, the protection component includes a first protection component connected in series between K nodes formed by the K branches connected to the conductive path.

[0027] In the technical solution of the embodiment of the present application, the first protection component is connected in series between K nodes. In the event of insulation failure of one or more electrical boxes (supports), the first protection component can suppress the short-circuit current, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion. At the same time, the number of connecting wires is small, which reduces the installation workload.

[0028] In some embodiments, the first protection component includes at least one first sub-protection component, the number of at least one first sub-protection component is ≤K-1, and 1 or 0 of the at least one first sub-protection component is connected in series between any two adjacent nodes among the K nodes.

[0029] In the technical solution of the embodiment of the present application, a first sub-protection component can be set for current limiting every 0 to multiple conductive sub-paths, thereby improving the flexibility of the configuration of the first current limiting protection component.

[0030] In some embodiments, the first protection component includes multiple first sub-protection components, the conductive path includes K-1 sub-paths formed by K nodes, a target sub-path is provided every m sub-paths, and the target sub-path is connected in series with the first sub-protection component, where m is a natural number.

[0031] In the technical solution of the embodiment of the present application, a first sub-protection component can be set every 0 to multiple sub-paths, which improves the flexibility of the configuration of the first protection component.

[0032] In some embodiments, the conductive path includes K-1 sub-paths formed by K nodes, and the first protection component includes K-1 first sub-protection components, which are respectively connected in series to the K-1 sub-paths.

[0033] In the technical solution of the embodiment of the present application, a first sub-protection component is provided between each adjacent support member. In the event of insulation failure of any support member, there is a first sub-protection component for short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0034] In some embodiments, the protection assembly further includes two second protection assemblies; the positive electrode of the first battery assembly is connected to the total positive line, and the negative electrode of the Mth battery assembly is connected to the Nth support member;

[0035] The first of the K branches is connected to the first node formed by the conductive path and one of the two second protection components connected between the total positive line, and the Kth branch of the K branches is connected to the Kth node formed by the conductive path and the other of the two second protection components connected between the total negative line; the second protection component is used to affect the current on the conductive path.

[0036] In the technical solution of the embodiment of the present application, a second protection component is connected in series between the first support member and the total positive circuit and between the Kth support member and the total negative circuit. In the event of insulation failure of the first support member and / or the Kth support member, there is a second protection component to suppress the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0037] In some embodiments, the resistance of each first sub-protection component is a first preset resistance, the resistance of the two second protection components is equal and greater than or equal to the first preset resistance, or the resistance of the second protection component is half of the first preset resistance.

[0038] In the technical solution of the embodiments of this application, the pressure differential between adjacent support members is equal. This improves the stability of the current limiting function of one or more first sub-protection components in the event of insulation failure in one or more support members, further reducing the possibility of high-voltage ignition and battery combustion and explosion. Setting the resistance of the second protection component to half the first preset resistance facilitates voltage balancing between adjacent support members. Setting the resistance of the second protection component to be greater than or equal to the first preset resistance facilitates insulation detection, enabling more sensitive detection of insulation failures.

[0039] In some embodiments, the resistance of the second protection component is 1.5 times, 2 times, 2.5 times, or 3 times the first preset resistance.

[0040] In the technical solution of the embodiment of the present application, some relationships between the resistance of the second protection component and the resistance of the first sub-protection component are provided, which is beneficial to insulation detection and enables insulation failure to be detected more sensitively.

[0041] In some embodiments, the energy storage system further includes: a plurality of first capacitive components connected in parallel with the plurality of first sub-protection components in a one-to-one correspondence.

[0042] In the technical solution of the embodiment of the present application, in the event of a lightning strike, surge, or the like, each first capacitive component suppresses the voltage spike on each first sub-protection component, thereby reducing the possibility of breakdown of the first sub-protection component and improving the reliability of the energy storage system. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage system.

[0043] In some embodiments, the energy storage system further includes: a plurality of second capacitive components connected in parallel with the plurality of second protection components in a one-to-one correspondence.

[0044] In the technical solution of the embodiment of the present application, in the event of a lightning strike, surge, or the like, each second capacitive component suppresses the voltage spike on each second protection component, thereby reducing the possibility of breakdown of the second protection component and improving the reliability of the energy storage system. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage system.

[0045] In some embodiments, the protection component includes a third protection component, and the third protection component is connected in series on the K branches.

[0046] In the technical solution of the embodiment of the present application, the third protection component is arranged on K branches, and is used for short-circuit protection in the event of insulation failure of more than one electrical box (support member), thereby reducing the possibility of high-voltage ignition and battery combustion and explosion, and making wiring more flexible.

[0047] In some embodiments, the third protection component includes at least one third sub-protection component, and the at least one third sub-protection component is respectively connected in series to any at least one branch.

[0048] In the technical solution of the embodiment of the present application, the number of third sub-protection components configured can be reduced, saving costs.

[0049] In some embodiments, the third protection component includes K third sub-protection components, and the K third sub-protection components are respectively connected in series to K branches.

[0050] In the technical solution of the embodiment of the present application, a third sub-protection component is provided between each adjacent support member. In the event of insulation failure of any support member, at least two overcurrent third protection components are provided to provide short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0051] In some embodiments, the energy storage system further includes: a plurality of third capacitive components connected in parallel with the plurality of third sub-protection components in a one-to-one correspondence.

[0052] In the technical solution of the embodiment of the present application, in the event of lightning strikes, surges, etc., each third capacitive component suppresses the peak voltage of the voltage on each third sub-protection component, reducing the possibility of breakdown of the third sub-protection component and improving the reliability of the energy storage system.

[0053] In some embodiments, the energy storage system further includes a first supporting device, the first supporting device being used to support N supporting members; the total negative line and the first supporting device are connected to the electrical platform; or

[0054] The total positive line and the first supporting equipment are connected to the power platform; or

[0055] Any supporting member and the first supporting device are connected to the electrical platform.

[0056] In the technical solution of the embodiment of the present application, the total negative line and the first supporting device are connected to the electrical platform in common; or because the total positive line and the first supporting device are connected to the electrical platform in common; or any one of the supporting members and the first supporting device are connected to the electrical platform in common; the potential of each supporting member can be fixed, and the potential is no longer floating, which reduces the possibility of the electrical stress acting on the insulation exceeding its safety limit under certain transient conditions, that is, reduces the risk of insulation failure.

[0057] In some embodiments, when N is an even number, the N / 2th and / or N / 2+1th support members are connected to the electrical platform together with the first support device;

[0058] When N is an odd number, the (N+1) / 2th supporting member and the first supporting device are connected to the electrical platform.

[0059] In the technical solution of the embodiment of the present application, the middlemost support member and the first support device are connected to the electrical platform together, so that when the electrical platform is insulated and grounded, the maximum value of the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line are minimized, further improving the safety and reliability of the energy storage system.

[0060] In some embodiments, the protection component includes a current limiting component, which is used to limit the current in the conductive path; or

[0061] The protection component includes an overcurrent protection component, which is used to perform overcurrent protection on the current in the conductive path.

[0062] In the technical solution of the embodiment of the present application, the protection component can be a current limiting component or an overcurrent protection component, which improves the flexibility of the protection component configuration.

[0063] In a second aspect, an embodiment of the present application provides an insulation detection method based on the above-mentioned energy storage system, comprising:

[0064] When the first detection switch and the second detection switch are disconnected, obtaining a first voltage between the total positive line and the electrical platform and a second voltage between the total negative line and the electrical platform;

[0065] When the first detection switch or the second detection switch is closed, obtaining a third voltage between the total positive line and the electrical platform and a fourth voltage between the total positive line and the electrical platform;

[0066] The first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line V- and the electrical platform are calculated based on the first reference resistance, the second reference resistance, the first voltage, the second voltage, the third voltage and the fourth voltage.

[0067] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive circuit, the total negative circuit and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0068] In a third aspect, an embodiment of the present application provides an insulation detection method based on the above-mentioned energy storage system, comprising:

[0069] When the first detection switch is turned off and the second detection switch is turned on, obtaining a first voltage drop across the fourth reference resistor and a second voltage drop across the fifth reference resistor;

[0070] When the first detection switch is turned on and the second detection switch is turned off, obtaining a third voltage drop across the fourth reference resistor and a fourth voltage drop across the fifth reference resistor;

[0071] Based on the first reference resistance, the second reference resistance, the third reference resistance, the fourth reference resistance, the fifth reference resistance, the sixth reference resistance, the first voltage drop, the second voltage drop, the third voltage drop and the fourth voltage drop, calculate the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform.

[0072] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive circuit, the total negative circuit and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0073] In a fourth aspect, an embodiment of the present application provides an insulation detection method based on the above-mentioned energy storage system, comprising:

[0074] Controlling the first switch and the second switch to be disconnected;

[0075] When the first detection switch and the second detection switch are disconnected, obtaining a first voltage between the total positive line and the electrical platform and a second voltage between the total negative line and the electrical platform;

[0076] When the first detection switch or the second detection switch is closed, obtaining a third voltage between the total positive line and the electrical platform and a fourth voltage between the total positive line and the electrical platform;

[0077] A first insulation resistance between the total positive line and the electrical platform and / or a second insulation resistance between the total negative line and the electrical platform is calculated based on the first reference resistance, the second reference resistance, the first voltage, the second voltage, the third voltage and the fourth voltage.

[0078] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive circuit, the total negative circuit and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0079] In a fifth aspect, an embodiment of the present application provides an insulation detection method based on the above-mentioned energy storage system, comprising:

[0080] Controlling the first switch and the second switch to be disconnected;

[0081] When the first detection switch is turned off and the second detection switch is turned on, obtaining a first voltage drop across the fourth reference resistor and a second voltage drop across the fifth reference resistor;

[0082] When the first detection switch is turned on and the second detection switch is turned off, obtaining a third voltage drop across the fourth reference resistor and a fourth voltage drop across the fifth reference resistor;

[0083] Based on the first reference resistance, the second reference resistance, the third reference resistance, the fourth reference resistance, the fifth reference resistance, the sixth reference resistance, the first voltage drop, the second voltage drop, the third voltage drop and the fourth voltage drop, calculate the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform.

[0084] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive circuit, the total negative circuit and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0085] In a sixth aspect, an embodiment of the present application provides a power supply device, which includes the energy storage system as described above.

[0086] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0088] FIG1 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0089] FIG2 is a circuit diagram of an energy storage system provided by some embodiments of the present application;

[0090] FIG3 is a circuit diagram of an energy storage system provided in some embodiments of the present application;

[0091] FIG4 is a circuit diagram of an energy storage system provided by some embodiments of the present application;

[0092] FIG5 is a circuit diagram of an energy storage system provided in some embodiments of the present application;

[0093] FIG6 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0094] FIG7 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0095] FIG8 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0096] FIG9 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0097] FIG10 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0098] FIG11 is a schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0099] FIG12 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application;

[0100] FIG13 is a schematic structural diagram of an energy storage system provided in some embodiments of the present application. DETAILED DESCRIPTION

[0101] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0102] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0103] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0104] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0105] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0106] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0107] With the widespread adoption of energy storage systems and transmission and distribution grids, addressing the need for power supply for equipment has become a major societal challenge. The DC unit of an energy storage system is typically housed in a cabinet. This unit contains multiple battery packs (or boxes), which are connected in series and parallel before being fed into a power conversion system (PCS).

[0108] Typically, each battery pack housing is either connected to the electrical cabinet at the same potential or in a suspended or quasi-suspended state. The problem with equipotential connection—that is, all battery pack housings within the cabinet are connected together—is that if the insulation of one or more battery packs within the cabinet fails, it will immediately lead to insulation failure and a short circuit, resulting in low reliability and a high risk of thermal runaway. The problem with a battery pack in a suspended or quasi-suspended state is that the potential of the floating housing is uncertain, and under certain transient conditions, electrical stress on the insulation may exceed safety limits, increasing the risk of insulation failure.

[0109] In order to solve the problem of reducing short-circuit current in the event of insulation failure of more than one electrical box, the inventive concept of this application is to set a voltage equalizing chain between each battery pack, and set a protection component on the voltage equalizing chain. The protection component is used to suppress the current between more than one electrical box when there is current passing through, for example, in the event of insulation failure of more than one electrical box, thereby improving the safety and reliability of the energy storage system. In addition, the voltage equalizing chain can also fix the potential of all battery pack shells, and at the same time solve the problem of floating potential of the battery pack shells. In addition, an insulation detection circuit can be set in the energy storage system to detect the insulation parameters of the energy storage system, reducing the possibility of long-term operation of battery components with insulation failure defects.

[0110] According to some embodiments of the present application, referring to FIG1 , FIG1 shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. For ease of illustration, only parts related to the present embodiment are shown, which are described in detail as follows:

[0111] The energy storage system includes a total positive line V+, a total negative line V−, and a battery module connected between the total positive line V+ and the total negative line V−. The energy storage system is configured to output electrical energy from the battery module through the total positive line V+ and the total negative line V−, and / or the energy storage system is configured to input electrical energy to the battery module through the total positive line V+ and the total negative line V−.

[0112] The battery module includes M battery assemblies 11 connected in series;

[0113] The energy storage system further includes N supporting members 12, M battery assemblies 11 are supported by the N supporting members 12, and the M battery assemblies 11 are insulated from the N supporting members 12;

[0114] The energy storage system further includes a conductive path 13 , wherein K support members 12 out of the N support members 12 are respectively connected to the conductive path 13 through K branches, wherein M, N, and K are all positive integers, and M≥N≥K>1;

[0115] The energy storage system further includes an insulation detection circuit 14 , which is connected to the total positive line V+ and the total negative line V− and is configured to detect insulation parameters of the energy storage system.

[0116] It is understandable that the total positive line V+ and the total negative line V- are used to input or output electricity. The battery assembly 11 includes one or more battery cells connected in parallel and / or in series. The support member 12 includes a shell (also called an electrical box) or a cold plate, and the shell or the cold plate can be made of metal. It is worth noting that the cold plate is a battery cold plate, which refers to a thin plate located under the battery assembly 11. Its main function is to conduct the heat inside the battery and keep the battery temperature stable, thereby improving the battery's operating efficiency. Each support member 12 can support one or more battery assemblies 11. The branch and the conductive path 13 can both be conductive lines, and can also include conductive lines and other conductive components. The insulation parameters of the energy storage system are, for example, the insulation resistance between the total positive line V+ and the total negative line V-.

[0117] In the technical solution of the embodiment of the present application, based on the insulation arrangement of the battery assembly 11 and the support member 12; K support members 12 out of the N support members 12 are respectively connected to the conductive path 13 through K branches. In the event of insulation failure of more than one electrical box (i.e., support member 12), that is, when insulation failure occurs at more than one point in the support member 12, the short-circuit current caused by the insulation failure is borne by the conductive path 13. The impedance of the conductive path 13 can be configured to suppress the short-circuit current, thereby playing a short-circuit protection role and reducing the possibility of high-voltage ignition and battery combustion and explosion; in addition, an insulation detection circuit 14 is also provided to detect the insulation parameters of the energy storage system, reducing the possibility of the battery assembly 11 operating with insulation failure defects for a long time.

[0118] According to some embodiments of the present application, referring to FIG. 2 and FIG. 3 , FIG. 2 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present application, and FIG. 3 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present application. For ease of description, only portions related to the present embodiment are shown, which are described in detail as follows:

[0119] In some embodiments, the insulation detection circuit 14 includes a first detection switch K1, a second detection switch K2, a first reference resistor Rm1 and a second reference resistor Rm2;

[0120] The first end of the first reference resistor Rm1 is connected to the total positive line V+ through the first detection switch K1; the first end of the second reference resistor Rm2 is connected to the total negative line V- through the second detection switch K2; the second end of the first reference resistor Rm1 and the second end of the second reference resistor Rm2 are connected to the electrical platform in common.

[0121] Exemplarily, the first detection switch K1 and the second detection switch K2 are, for example, semiconductor transistors, relays, contactors, or circuit breakers. As understood by those skilled in the art, the electrical platform can be assigned a potential, and / or the electrical platform can be provided with a potential. As an example, when the electrical platform is grounded, the equipment connected to the electrical platform (such as the electrical box housing of the battery) is generally also considered to be grounded. In this example, the electrical platform is assigned a ground potential through grounding, and the equipment connected to the electrical platform is provided with a ground potential by the electrical platform; as another example, when the electrical platform is connected to the total positive line of the electrical cabinet, it can be considered that the electrical platform is assigned the potential of the total positive line. If there is a device (such as the electrical cabinet body of the battery) connected to the electrical platform, it can be considered that the device is provided with the potential of the total positive line by the electrical platform. As an example, the electrical platform can be an object with equal potential so that the devices connected to the electrical platform have equal potential. The electrical platform can be, for example, a power ground or a conductor connected to the power ground, or it can be an installation platform for the energy storage system, etc.

[0122] In the technical solution of the embodiment of the present application, a detection topology for the insulation parameters of an energy storage system is provided, which uses a detection switch to control the connection of a reference resistor to the energy storage system, and calculates the insulation parameters of the energy storage system by detecting relevant electrical parameters on the reference resistor.

[0123] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5 , FIG. 4 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present application, and FIG. 5 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present application. For ease of description, only portions related to the present embodiment are shown, which are described in detail as follows:

[0124] The insulation detection circuit 14 also includes a third reference resistor Rm3, a fourth reference resistor Rm4, a fifth reference resistor Rm5 and a sixth reference resistor Rm6; the third reference resistor Rm3 and the fourth reference resistor Rm4 are connected in series between the total positive line V+ and the electrical platform; the fifth reference resistor Rm5 and the sixth reference resistor Rm6 are connected in series between the total negative line V- and the electrical platform.

[0125] In the technical solution of the embodiment of the present application, another topology for detecting the insulation parameters of an energy storage system is provided, which uses a detection switch to control the connection of a reference resistor to the energy storage system, and calculates the insulation parameters of the energy storage system by detecting the relevant electrical parameters on the reference resistor.

[0126] According to some embodiments of the present application, referring to FIG. 2 and FIG. 4 , a first end of the conductive path 13 is connected to a first end of the first reference resistor Rm1 , and a second end of the conductive path 13 is connected to a first end of the second reference resistor Rm2 .

[0127] In this way, the conductive path 13 also stabilizes the potential of all support members 12, resolving the issue of floating potential within the battery pack housing. The fixed potential of all support members 12, i.e., a certain bias voltage, results in significant current and voltage fluctuations within the conductive path 13 if insulation failure occurs in one or more support members 12, making the failure easily detectable.

[0128] The insulation monitoring process involves sampling the voltage of the insulation detection circuit 14 twice in different detection switch states. The sampled voltages and a reference resistance are then used to establish an equation to calculate the insulation resistance. Assume that an equivalent first insulation resistance Rx is formed between the total positive line V+ and the electrical platform, and an equivalent second insulation resistance Ry is formed between the total negative line V- and the electrical platform.

[0129] Example 1, referring to Figure 2, when the first detection switch K1 and the second detection switch K2 are disconnected, the voltage V1 between the total positive line V+ and the electric platform, and the voltage V2 between the total negative line V- and the electric platform are detected. According to the current loop equality principle, the following is obtained:

[0130] Close the first detection switch K1 (in other examples, the second detection switch K2 can be closed), detect the voltage V1' between the total positive line V+ and the electric platform, and detect the voltage V2' between the total positive line V+ and the electric platform. As the battery module voltage remains unchanged, we can obtain:

[0131] V1′=V1+V2-V2' (2)

[0132] According to the principle of equal loop current, we can obtain:

[0133] According to formulas (1)-(3), the resistance values ​​of the two insulation resistors are derived as follows:

[0134] Example 2, referring to FIG4 , when the first detection switch K1 is closed and the second detection switch K2 is open, the voltage V1 across the fourth reference resistor Rm4 and the voltage V2 across the fifth reference resistor Rm5 are detected. According to the principle of equal loop current, the following are obtained:

[0135] When the first detection switch K1 is open and the second detection switch K2 is closed, the voltage V1' across the fourth reference resistor Rm4 and the voltage V2' across the fifth reference resistor Rm5 are detected. According to the principle of equal loop current, the following equations are obtained:

[0136] The resistance values ​​of the two insulation resistors are derived according to formulas (6) and (7).

[0137] The above insulation monitoring process and the calculation of the two insulation resistances are only examples. During the implementation of the solution, the specific method of the insulation monitoring process and the calculation of the insulation resistance are not limited to these.

[0138] In the technical solution of the embodiment of the present application, a connection method of the conductive path 13 is provided to cooperate with the detection of the insulation parameters of the energy storage system, so that the energy storage system can not only solve the insulation failure of more than one electrical box, but also detect the insulation parameters of the energy storage system.

[0139] According to some embodiments of the present application, the energy storage system further includes a first switch K11 and a second switch K12. The first end of the conductive path 13 is connected to the total positive line V+ through the first switch K11, and the second end of the conductive path 13 is connected to the total negative line V- through the second switch K12.

[0140] Exemplarily, the first switch K11 and the second switch K12 may be semiconductor transistors, relays, contactors, or circuit breakers. In this way, the conductive path 13 can also maintain a constant potential for all support members 12, resolving the issue of floating potential within the battery pack housing. The potential of all support members 12 is constant, meaning they all have a certain bias voltage. If insulation failure occurs in one or more support members 12, significant current and voltage changes will occur within the conductive path 13, making the insulation failure easily detectable.

[0141] Example 3, please refer to Figure 3. First, turn off the first switch K11 and the second switch K12, and then disconnect the first detection switch K1 and the second detection switch K2. Detect the voltage V1 between the total positive line V+ and the electrical platform, and the voltage V2 between the total negative line V- and the electrical platform. Close the first detection switch K1, detect the voltage V1' between the total positive line V+ and the electrical platform, and detect the voltage V2' between the total positive line V+ and the electrical platform. Finally, the resistance values ​​of the two insulation resistors can be calculated. Refer to the above formulas (4)(5).

[0142] Example 4, referring to FIG5 , first turn off the first switch K11 and the second switch K12. When the first detection switch K1 is closed and the second detection switch K2 is open, detect the voltage V1 across the fourth reference resistor Rm4 and the voltage V2 across the fifth reference resistor Rm5. Formula (5) is obtained based on the principle of equal loop current.

[0143] When the first detection switch K1 is disconnected and the second detection switch K2 is closed, the voltage V1' across the fourth reference resistor Rm4 and the voltage V2' across the fifth reference resistor Rm5 are detected. According to the principle of loop current equality, formula (6) is obtained:

[0144] The resistance values ​​of the two insulation resistors are derived according to formulas (5)-(6).

[0145] In the technical solution of the embodiment of the present application, another connection method of the conductive path 13 is provided to cooperate with the detection of the insulation parameters of the energy storage system, so that the energy storage system can not only solve the insulation failure of more than one electrical box, but also detect the insulation parameters of the energy storage system.

[0146] According to some embodiments of the present application, please refer to FIG6 , which shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. For ease of illustration, only the parts related to the present embodiment are shown, which are detailed as follows:

[0147] Conductive pathway 13 and / or branches are provided with protection components 131. Protection components 131 may include current limiting components and / or overcurrent protection components. It should be noted that FIG6 only illustrates the protection components, and that protection components 131 are provided in conductive pathway 13 and connected in series with each branch.

[0148] In the technical solution of the embodiment of the present application, based on the insulation arrangement of the battery assembly 11 and the support member 12; K support members 12 out of the N support members 12 are respectively connected to the conductive path 13 through K branches. In the event of insulation failure of more than one electrical box, that is, when the insulation of more than one support member 12 fails, the short-circuit current caused by the insulation failure can be borne by the protection component 131 on the conductive path 13, thereby playing a short-circuit protection role and reducing the possibility of causing high-voltage ignition and battery combustion and explosion.

[0149] According to some embodiments of the present application, please refer to FIG7 , which shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. For ease of illustration, only the parts related to the present embodiment are shown, which are detailed as follows:

[0150] According to some embodiments of the present application, the protection component 131 includes a first protection component 1311 , and the first protection component 1311 is connected in series between K nodes X formed by K branches connected to the conductive path 13 .

[0151] In the technical solution of the embodiment of the present application, the first protection component 1311 is connected in series between K nodes X. In the event of insulation failure in one or more electrical boxes, the first protection component 1311 can suppress the short-circuit current, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion. At the same time, the number of connecting wires is reduced, thereby reducing the installation workload.

[0152] According to some embodiments of the present application, optionally, the first protection component 1311 includes at least one first sub-protection component, the number of at least one first sub-protection component is ≤K-1, and any two adjacent nodes X among the K nodes X are connected in series with 1 or 0 of the at least one first sub-protection component.

[0153] It is understandable that there can be any number of first sub-protection components, which can be connected in series at any two nodes X. When there are two support members 12, there is one first sub-protection component; when there are three or more support members 12, there can be one or more first sub-protection components.

[0154] In the technical solution of the embodiment of the present application, a first sub-protection component can be set for current limiting every 0 or more nodes X, which improves the flexibility of the configuration of the first current limiting protection component.

[0155] According to some embodiments of the present application, optionally, the first protection component 1311 includes multiple first sub-protection components, the conductive path 13 includes K-1 sub-paths formed by K nodes X, a target sub-path is provided every m sub-paths, and the target sub-path is connected in series with the first sub-protection component, where m is a natural number.

[0156] It can be understood that at this time, the first sub-protection components are evenly distributed among the multiple support members 12. Due to the protective effect of one or more first sub-protection components, the short-circuit current is reduced, and the evenly distributed first sub-protection components further reduce the possibility of causing high-voltage ignition and battery combustion and explosion.

[0157] In the technical solution of the embodiment of the present application, a first sub-protection component can be set every 0 to multiple sub-paths, which improves the flexibility of the configuration of the first protection component.

[0158] According to some embodiments of the present application, optionally, the conductive path 13 includes K-1 sub-paths formed by K nodes X, and the first protection component 131 includes K-1 first sub-protection components, and the K-1 first sub-protection components are respectively connected in series on the K-1 sub-paths.

[0159] It is understandable that a first sub-protection component is provided between each adjacent support member 12 , so when insulation failure occurs in any support member 12 , one or more sub-protection components will affect the short-circuit current.

[0160] In the technical solution of the embodiment of the present application, a first sub-protection component is provided between each adjacent support member. In the event of insulation failure of any support member 12, there is a first sub-protection component for short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0161] According to some embodiments of the present application, please refer to FIG8 and FIG9 . FIG8 shows a schematic diagram of the structure of an energy storage system provided in one embodiment of the present application. FIG9 shows a schematic diagram of the structure of an energy storage system provided in one embodiment of the present application. For ease of description, only the parts related to this embodiment are shown, which are detailed as follows:

[0162] The protection assembly 13 further includes two second protection assemblies 1312; the positive electrode of the first battery assembly 11a is connected to the total positive line V+, and the negative electrode of the Mth battery assembly 11b is connected to the Nth support member 12b;

[0163] The first of the K branches is connected to the first node X1 formed by the conductive path 13 and the total positive line V+, and one of the two second protection components 1312 is connected between the Kth branch among the K branches and the Kth node Xk formed by the conductive path 13 and the total negative line V-; the second protection component 1312 is used to affect the current on the conductive path 13.

[0164] For example, in a battery module, the first battery assembly 11a and the M-th battery assembly 11b in the M battery assemblies 11 connected in series refer to the first and M-th battery assemblies 11 in the series order, respectively, and the first battery assembly 11a is supported by the first support member 12a, and the M-th battery assembly 11b is supported by the N-th support member 12b.

[0165] For example, the second protection component 1312 may include a current limiting component and / or an overcurrent component. A plurality of first sub-protection components and two second protection components 1312 form a voltage balancing chain to balance the voltage between each two adjacent support members 12 .

[0166] For example, when K=N, the first support member 12a and the Nth support member 12b are respectively connected to the first node X1 and the Kth node Xk on the conductive path 13, that is, the first support member 12a is at the same potential as the first node X1, and the Nth support member 12b is at the same potential as the Kth node Xk. Therefore, there are at least two situations in which the first node X1 and the Kth node Xk are respectively connected to the total positive line V+ and the total negative line V- through two second protection components 1312. For example, in the example of Figure 8, the first node X1 and the Kth node Xk are respectively directly connected to the total positive line V+ and the total negative line V- through two second protection components 1312, and the first support member 12a and the Nth support member 12b are further electrically connected to the total positive line V+ and the total negative line V-, respectively. In the example of FIG. 9 , the two second protection components 1312 are respectively provided on the first support member 12 a and the Nth support member 12 b , and the first support member 12 a and the Nth support member 12 b are respectively connected to the total positive line V+ and the total negative line V−.

[0167] In the technical solution of the embodiment of the present application, a second protection component 1312 is connected in series between the first support member 12a and the total positive line V+, and between the Nth support member 12b and the total negative line V-. In the event of insulation failure of the first support member 12a and / or the Nth support member 12b, there is a second protection component 1312 to suppress the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0168] In some embodiments, the resistance of each first sub-protection component is a first preset resistance, the resistance of the two second protection components 1312 is equal and greater than or equal to the first preset resistance, or the resistance of the second protection component 1312 is half of the first preset resistance.

[0169] The resistance of the first sub-protection components is equal, and the resistance of the second protection component 1312 is half of the first preset resistance, thereby achieving balanced pressure differences between adjacent support members 12, and reducing the electrical stress on the battery pack insulation during normal operation.

[0170] In some embodiments, when m is 0, the resistance of each first sub-protection component is the first preset resistance R; when m is greater than 0, the resistance of each first sub-protection component is the first configured resistance mR;

[0171] Exemplarily, when m is 0, the resistance of the second protection component 1312 is 1.5 times, 2 times, 2.5 times, or 3 times the first preset resistance.

[0172] The voltage difference between each adjacent support member 12 is Vbus / n. When the resistance values ​​of the two second protection components 1312 are both twice the first preset resistance value, the voltage difference between the first support member 12a and the total positive line V+ is 2Vbus / n; the voltage difference between the nth support member 12b and the total negative line V- is 2Vbus / n, where Vbus / is the voltage difference between the total negative line V- and the total positive line V+.

[0173] Among them, setting the resistance of the second protection component 1312 to a resistance greater than the resistance of the first sub-protection component can improve the sensitivity of insulation failure detection compared to setting the resistance of the second protection component 1312 to a resistance less than or equal to the resistance of the first sub-protection component, and insulation failure can be more easily discovered.

[0174] When m is greater than 0, the voltage drop across each first sub-protection component is equal to m*Vbus / n. This equalizes the voltage drop across each first sub-protection component, further improving the stability of the current limiting function of the voltage balancing chain and reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0175] In the technical solution of the present embodiment, the pressure differential between adjacent support members is equal. This improves the stability of the current limiting function of one or more first sub-protection components in the event of insulation failure in one or more support members 12, further reducing the possibility of high-voltage ignition and battery combustion and explosion. Setting the resistance of second protection component 1312 to be greater than or equal to the first predetermined resistance facilitates insulation detection, enabling more sensitive detection of insulation failures.

[0176] In the technical solution of the embodiment of the present application, some relationships between the resistance of the second protection component 1312 and the resistance of the first sub-protection component are provided, which is beneficial to insulation detection and enables insulation failure to be detected more sensitively.

[0177] According to some embodiments of the present application, please refer to FIG10 , which shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. For ease of illustration, only the parts related to the present embodiment are shown, which are detailed as follows:

[0178] The energy storage system further includes: a plurality of first capacitive components 16 connected in parallel with the plurality of first sub-protection components in a one-to-one correspondence.

[0179] Exemplarily, the first capacitive component 16 includes a capacitor. In the event of lightning strike, surge, etc., a peak current will appear on each first sub-protection component, and each first capacitive component 16 suppresses the peak voltage on the voltage of each first sub-protection component.

[0180] In the technical solution of the embodiment of the present application, in the event of a lightning strike, surge, or the like, each first capacitive component 16 suppresses the voltage spike on each first sub-protection component, thereby reducing the possibility of breakdown of the first sub-protection component and improving the reliability of the energy storage system. At the same time, the spike voltage between the total positive line V+ and the total negative line V- is filtered out, thereby improving the stability of the energy storage system.

[0181] According to some embodiments of the present application, please continue to refer to FIG. 10 , the energy storage system further includes: a plurality of second capacitive components 17 connected in parallel with the plurality of second protection components 1312 in a one-to-one correspondence.

[0182] Exemplarily, the second capacitive component 17 includes a capacitor. In the event of lightning strike, surge, etc., a spike current will appear on each second protection component 1312, and each second capacitive component 17 suppresses the spike voltage on each second protection component 1312.

[0183] In the technical solution of the embodiment of the present application, in the event of a lightning strike, surge, or the like, each second capacitive component 17 suppresses the voltage spike on each second protection component 1312, thereby reducing the possibility of breakdown of the second protection component 1312 and improving the reliability of the energy storage system. At the same time, the spike voltage between the total positive line V+ and the total negative line V- is filtered out, thereby improving the stability of the energy storage system.

[0184] In some embodiments, when m is 0, the capacitance of each first capacitive component 16 is the first preset capacitance C; when m is greater than 0, the capacitance of each first capacitive component 16 is the first configured capacitance mC.

[0185] In one embodiment, when m is 0, the capacitance of each first capacitive component 16 is the first preset capacitance; and the capacitance of each second capacitive component 17 is half of the first preset capacitance.

[0186] In one embodiment, when m is greater than 0, the capacitance of each first capacitive component 16 is m times the first preset capacitance.

[0187] Since the quotient of the capacitance of each capacitive component and the resistance of the corresponding protection component or sub-protection component is the same, the peak voltage suppression capability of the voltage between each support member 12 is the same.

[0188] By adopting the above solution, the capacitance values ​​of the first capacitive components 16 are equal, so that the peak voltage suppression capabilities between the support members 12 are the same, further improving the stability and reliability of the energy storage system.

[0189] According to some embodiments of the present application, please refer to Figures 11 and 12. Figure 11 shows a schematic diagram of the structure of an energy storage system provided in one embodiment of the present application, and Figure 12 shows a schematic diagram of the structure of an energy storage system provided in one embodiment of the present application. For ease of illustration, only the parts related to this embodiment are shown, which are detailed as follows:

[0190] The protection component 131 includes K third protection components 1313 , and the K third protection components 1313 are respectively connected in series to K branches.

[0191] The third protection component 1313 may include a current limiting component and / or an overcurrent component. It should be understood that the example in Figure 11 only illustrates the case where the third protection component 1313 is connected in series to each branch. In this example, K branches are connected to a common point, namely, the conductive path 13. It should be noted that only when the third protection component 1313 is connected in series to the K branches will the conductive path 13 have the same potential. In the example in Figure 12, the K branch conductive paths 13 form K nodes X. Any number of first protection components 1311 can be set between any of the nodes X. For details, please refer to the aforementioned embodiments.

[0192] In the technical solution of the embodiment of the present application, the third protection component 1313 is set on K branches and is used for short-circuit protection when the insulation of more than one electrical box (support member 12) fails, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion, and making the wiring more flexible.

[0193] In some embodiments, the third protection component 1313 includes at least one third sub-protection component, and the at least one third sub-protection component is connected in series to at least one branch. It is understood that there can be any number of third sub-protection components, and they can be connected in series to any branch.

[0194] In the technical solution of the embodiment of the present application, the number of third sub-protection components configured can be reduced, saving costs.

[0195] In some embodiments, the third protection component 1313 includes K third sub-protection components, and the K third sub-protection components are respectively connected in series to K branches.

[0196] It is understandable that a third sub-protection component is provided between each adjacent support member 12 , so that in the event of insulation failure of any support member 12 , two third sub-protection components are provided to provide overcurrent protection against short-circuit current.

[0197] In the technical solution of the embodiment of the present application, a third sub-protection component is provided between each adjacent support member. In the event of insulation failure of any support member 12, there are at least two overcurrent third protection components 1313 to provide short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0198] In some embodiments, the energy storage system further includes: a plurality of third capacitive components connected in parallel with the plurality of third sub-protection components in a one-to-one correspondence.

[0199] The third capacitive component is, for example, a capacitor. In the technical solution of the embodiment of the present application, in the event of a lightning strike, surge, or the like, each third capacitive component suppresses the voltage spike across each third sub-protection component, thereby reducing the possibility of breakdown of the third sub-protection component and improving the reliability of the energy storage system.

[0200] According to some embodiments of the present application, please refer to FIG13 , which shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. For ease of illustration, only the parts related to the present embodiment are shown, which are detailed as follows:

[0201] The energy storage system further includes a first supporting device 20, the first supporting device 20 being used to support N supporting members;

[0202] The total negative line V- and the first supporting device 20 are connected to the electrical platform; or

[0203] The total positive line V+ and the first supporting device 20 are connected to the power platform; or

[0204] Any one of the supporting members 12 and the first supporting device 20 are connected to the electrical platform.

[0205] The first supporting device 20 is, for example, an electrical cabinet, which houses various electrical boxes; or, the first supporting device 20 is, for example, a frame, which fixes the supporting member 12 .

[0206] Any node in the voltage-sharing chain can be connected to the power platform. The voltage of the total negative line V- and the voltage of the total positive line V+ change with the change of the node connected to the power platform, thereby adapting to various application scenarios and enriching the functions of the product.

[0207] In the technical solution of the embodiment of the present application, the total negative line V- and the first supporting device 20 are connected to the electrical platform in common; or because the total positive line V+ and the first supporting device 20 are connected to the electrical platform in common; or any one of the supporting members and the first supporting device 20 are connected to the electrical platform in common; the potential of each supporting member can be fixed, and the potential is no longer floating, which reduces the possibility that the electrical stress acting on the insulation under certain transient conditions exceeds its safety limit, that is, reduces the risk of insulation failure.

[0208] According to some embodiments of the present application, please continue to refer to FIG13 , when N is an even number, the N / 2th and / or N / 2+1th support members 12 and the first support device 20 are connected to the electrical platform together;

[0209] When N is an odd number, the (N+1) / 2th supporting member 12 and the first supporting device 20 are connected to the electrical platform.

[0210] It can be understood that when N is an odd number, the voltage between the electric platform and the total positive line V+ is a first voltage value, the voltage between the electric platform and the total negative line V- is a second voltage value, the first voltage value and the second voltage value are equal, and when the electric platform is grounded, the absolute value of the voltage of the total positive line V+ and the absolute value of the voltage of the total negative line V- are minimum. When N is an odd number, the voltage between the electric platform and the total positive line V+ is a first voltage value, the voltage between the electric platform and the total negative line V- is a second voltage value, and the first voltage value and the second voltage value are closest to each other. When the electric platform is grounded, similarly, the maximum absolute value of the voltage of the total positive line V+ and the absolute value of the voltage of the total negative line V- are minimum.

[0211] In the technical solution of the embodiment of the present application, the middlemost support member and the first support device 20 are connected to the electric platform together, so that when the electric platform is insulated and grounded, the maximum value of the absolute value of the voltage of the total positive line V+ and the absolute value of the voltage of the total negative line V- are minimized, further improving the safety and reliability of the energy storage system.

[0212] In some embodiments, the protection component 131 includes a current limiting component, which is used to limit the current of the conductive path 13; or

[0213] The protection component 131 includes an overcurrent protection component, which is used to perform overcurrent protection on the current in the conductive path 13 .

[0214] It should be noted that the current limiting component may include a resistor component. In specific implementations, the resistance of the current limiting component can range from kΩ to MΩ. The current limiting component reduces short-circuit current, lowering the possibility of high-voltage ignition and battery combustion and explosion, while maintaining the normal operation of the energy storage system.

[0215] The overcurrent protection assembly may include a fuse, a fuse, an electronic circuit breaker, a current protection switch, and an overcurrent relay. The overcurrent protection assembly disconnects the support member 12 if the insulation fails, reducing the possibility of high-voltage ignition and battery combustion and explosion, further improving safety and reliability.

[0216] In the technical solution of the embodiment of the present application, the protection component 131 can be a current limiting component or an overcurrent protection component, which improves the flexibility of the protection component configuration.

[0217] According to some embodiments of the present application, please continue to refer to FIG2 , which provides an insulation detection method based on the above-mentioned energy storage system, including the following steps:

[0218] When the first detection switch K1 and the second detection switch K2 are disconnected, a first voltage V1 between the total positive line V+ and the electric platform and a second voltage V2 between the total negative line V− and the electric platform are obtained.

[0219] Exemplarily, formula (1) can be obtained according to the current loop equality principle.

[0220] When the first detection switch K1 or the second detection switch K2 is closed, a third voltage V1 ′ between the total positive line V+ and the electric platform and a fourth voltage V2 ′ between the total positive line V+ and the electric platform are obtained.

[0221] For example, if the first voltage V1 ≥ the second voltage V2, the first detection switch K1 is closed. Since the battery module voltage remains unchanged, formula (2) is obtained, and (4) can be obtained based on the current loop equality principle. In other examples, if the first voltage V1 ≤ the second voltage V2, the second detection switch K2 can be closed.

[0222] Based on the first reference resistor Rm1, the second reference resistor Rm2, the first voltage V1, the second voltage V2 / the third voltage V1', and the fourth voltage V2', the first insulation resistance Rx between the total positive line V+ and the electrical platform and / or the second insulation resistance Ry between the total negative line V- and the electrical platform are calculated. Refer to formulas (4) and (5).

[0223] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive line V+, the total negative line V- and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0224] Exemplarily, the calculated first insulation resistance Rx and / or second insulation resistance Ry is compared with the corresponding insulation resistance threshold to obtain a comparison result, and an alarm is issued when the first insulation resistance Rx and / or second insulation resistance Ry is lower than the corresponding insulation resistance threshold.

[0225] According to some embodiments of the present application, before issuing an alarm, the method further includes:

[0226] If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding threshold, the aforementioned steps of voltage detection, insulation resistance calculation, and comparison are repeated multiple times. If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding insulation resistance threshold multiple times, an alarm is issued. Multiple times may include two, three, four, etc.

[0227] According to some embodiments of the present application, please continue to refer to FIG4 , which provides an insulation detection method based on the above-mentioned energy storage system, including the following steps:

[0228] When the first detection switch K1 is turned off and the second detection switch K2 is turned on, a first voltage drop V1 across the fourth reference resistor Rm4 and a second voltage drop V2 across the fifth reference resistor Rm5 are obtained;

[0229] When the first detection switch K1 is turned on and the second detection switch K2 is turned off, a third voltage drop V1′ across the fourth reference resistor Rm4 and a fourth voltage drop V2′ across the fifth reference resistor Rm5 are obtained;

[0230] Based on the first reference resistor Rm1, the second reference resistor Rm2, the third reference resistor Rm3, the fourth reference resistor Rm4, the fifth reference resistor Rm5, the sixth reference resistor Rm6, the first voltage drop V1, the second voltage drop V2, the third voltage drop V1' and the fourth voltage drop V2', calculate the first insulation resistance Rx between the total positive line V+ and the electrical platform and / or the second insulation resistance Ry between the total negative line V- and the electrical platform.

[0231] According to the principle of equal loop current, formula (6) and (7) are obtained, and the resistance values ​​of the two insulation resistors are derived according to formula (6) and (7).

[0232] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive line V+, the total negative line V- and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0233] Exemplarily, the calculated first insulation resistance Rx and / or second insulation resistance Ry is compared with the corresponding insulation resistance threshold to obtain a comparison result, and an alarm is issued when the first insulation resistance Rx and / or second insulation resistance Ry is lower than the corresponding insulation resistance threshold.

[0234] According to some embodiments of the present application, before issuing an alarm, the method further includes:

[0235] If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding threshold, the aforementioned steps of voltage detection, insulation resistance calculation, and comparison are repeated multiple times. If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding insulation resistance threshold multiple times, an alarm is issued. Multiple times may include two, three, four, etc.

[0236] According to some embodiments of the present application, please continue to refer to FIG3 , an insulation detection method based on the above energy storage system includes:

[0237] The first switch K11 and the second switch K12 are controlled to be disconnected.

[0238] When the first detection switch K1 and the second detection switch K2 are disconnected, a first voltage between the total positive line V+ and the electric platform and a second voltage between the total negative line V− and the electric platform are obtained.

[0239] Exemplarily, formula (1) can be obtained according to the current loop equality principle.

[0240] When the first detection switch K1 or the second detection switch K2 is closed, a third voltage V1 ′ between the total positive line V+ and the electric platform and a third voltage V2 ′ between the total positive line V+ and the electric platform are obtained.

[0241] Exemplarily, when the first voltage V1 ≥ the second voltage V2, the first detection switch K1 is closed. Since the battery module voltage remains unchanged, formula (2) is obtained, and (4) can be obtained based on the current loop equality principle. In other examples, when the first voltage V1 ≤ the second voltage V2, the second detection switch K2 can be closed.

[0242] Based on the first reference resistor Rm1, the second reference resistor Rm2, the first voltage V1, the second voltage V2, the third voltage V1', and the fourth voltage V2', the first insulation resistance Rx between the total positive line V+ and the electrical platform and / or the second insulation resistance Ry between the total negative line V- and the electrical platform are calculated. Refer to formulas (4) and (5).

[0243] Exemplarily, the calculated first insulation resistance Rx and / or second insulation resistance Ry is compared with the corresponding insulation resistance threshold to obtain a comparison result, and an alarm is issued when the first insulation resistance Rx and / or second insulation resistance Ry is lower than the corresponding insulation resistance threshold.

[0244] According to some embodiments of the present application, before issuing an alarm, the method further includes:

[0245] If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding threshold, the aforementioned steps of voltage detection, insulation resistance calculation, and comparison are repeated multiple times. If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding insulation resistance threshold multiple times, an alarm is issued. Multiple times may include two, three, four, etc.

[0246] According to some embodiments of the present application, please continue to refer to FIG5 , which provides an insulation detection method based on the above-mentioned energy storage system, including:

[0247] Control the first switch K11 and the second switch K12 to be disconnected;

[0248] When the first detection switch K1 is turned off and the second detection switch K2 is turned on, a first voltage drop V1 across the fourth reference resistor Rm4 and a second voltage drop V2 across the fifth reference resistor Rm5 are obtained;

[0249] When the first detection switch K1 is turned on and the second detection switch K2 is turned off, a third voltage drop V1′ across the fourth reference resistor Rm4 and a fourth voltage drop V2′ across the fifth reference resistor Rm5 are obtained;

[0250] Based on the first reference resistor Rm1, the second reference resistor Rm2, the third reference resistor Rm3, the fourth reference resistor Rm4, the fifth reference resistor Rm5, the sixth reference resistor Rm6, the first voltage drop V1, the second voltage drop V2, the third voltage drop V1' and the fourth voltage drop V2', calculate the first insulation resistance Rx between the total positive line V+ and the electrical platform and / or the second insulation resistance Ry between the total negative line V- and the electrical platform.

[0251] According to the principle of equal loop current, formula (6) and (7) are obtained, and the resistance values ​​of the two insulation resistors are derived according to formula (6) and (7).

[0252] In the technical solution of the embodiment of the present application, a method for detecting the insulation resistance between the total positive line V+, the total negative line V- and the electrical platform is provided to realize the monitoring of the insulation resistance, thereby reducing the possibility of the battery assembly operating with insulation failure defects for a long time.

[0253] Exemplarily, the calculated first insulation resistance Rx and / or second insulation resistance Ry is compared with the corresponding insulation resistance threshold to obtain a comparison result, and an alarm is issued when the first insulation resistance Rx and / or second insulation resistance Ry is lower than the corresponding insulation resistance threshold.

[0254] According to some embodiments of the present application, before issuing an alarm, the method further includes:

[0255] If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding threshold, the aforementioned steps of voltage detection, insulation resistance calculation, and comparison are repeated multiple times. If the first insulation resistance Rx and / or the second insulation resistance Ry are below the corresponding insulation resistance threshold multiple times, an alarm is issued. Multiple times may include two, three, four, etc.

[0256] According to some embodiments of the present application, the present application also provides a power supply device, including the energy storage system of any of the above solutions.

[0257] In a specific implementation, the power supply device may include an energy storage station, and the energy storage system stores electrical energy for the energy storage station and releases the electrical energy when the power grid is short of energy.

[0258] Since the power supply device includes the energy storage system of any of the above solutions, it can affect the short-circuit current and reduce the possibility of causing high-voltage ignition and battery combustion and explosion.

[0259] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An energy storage system, characterized in that: The energy storage system comprises a total positive circuit, a total negative circuit, and a battery module connected between the total positive circuit and the total negative circuit, wherein the energy storage system is configured to output electric energy from the battery module through the total positive circuit and the total negative circuit, and / or the energy storage system is configured to input electric energy to the battery module through the total positive circuit and the total negative circuit; The battery module includes M battery assemblies connected in series; The energy storage system further includes N supporting members, the M battery assemblies are supported by the N supporting members, and the M battery assemblies are insulated from the N supporting members; The energy storage system further includes a conductive path, wherein K support members among the N support members are connected to the conductive path through K branches respectively, wherein M, N, and K are all positive integers, and M≥N≥K>1; The energy storage system further includes an insulation detection circuit, which is connected to the total positive line and the total negative line and is configured to detect insulation parameters of the energy storage system.

2. The energy storage system according to claim 1, characterized in that: The insulation detection circuit includes a first detection switch, a second detection switch, a first reference resistor and a second reference resistor; The first end of the first reference resistor is connected to the total positive line through the first detection switch; The first end of the second reference resistor is connected to the total negative line through the second detection switch; The second end of the first reference resistor and the second end of the second reference resistor are commonly connected to the electrical platform.

3. The energy storage system according to claim 2, characterized in that: The insulation detection circuit also includes a third reference resistor, a fourth reference resistor, a fifth reference resistor and a sixth reference resistor; The third reference resistor and the fourth reference resistor are connected in series between the total positive circuit and the electrical platform; the fifth reference resistor and the sixth reference resistor are connected in series between the total negative circuit and the electrical platform.

4. The energy storage system according to claim 2 or 3, characterized in that: A first end of the conductive path is connected to a first end of the first reference resistor, and a second end of the conductive path is connected to a first end of the second reference resistor.

5. The energy storage system according to claim 2 or 3, characterized in that: It also includes a first switch and a second switch, wherein the first end of the conductive path is connected to the total positive line through the first switch, and the second end of the conductive path is connected to the total negative line through the second switch.

6. The energy storage system according to any one of claims 1 to 5, characterized in that: The conductive path and / or the branch path is provided with a protection component.

7. The energy storage system according to claim 6, characterized in that: The protection component includes a first protection component, and the first protection component is connected in series between the K branches connected to the K nodes formed by the conductive path.

8. The energy storage system according to claim 7, characterized in that: The first protection component includes at least one first sub-protection component, the number of the at least one first sub-protection component is ≤K-1, and one or zero of the at least one first sub-protection component is connected in series between any two adjacent nodes among the K nodes.

9. The energy storage system according to claim 7, characterized in that: The first protection component includes multiple first sub-protection components, the conductive path includes K-1 sub-paths formed by the K nodes, a target sub-path is provided for every m sub-paths, and the target sub-path is connected in series with the first sub-protection component, and m is a natural number.

10. The energy storage system according to claim 7, characterized in that: The conductive path includes K-1 sub-paths formed by the K nodes, and the first protection component includes K-1 first sub-protection components, and the K-1 first sub-protection components are respectively connected in series to the K-1 sub-paths.

11. The energy storage system according to claim 8, characterized in that: The protection assembly further includes two second protection assemblies; the positive electrode of the first battery assembly is connected to the total positive line, and the negative electrode of the Mth battery assembly is connected to the Nth support member; The first branch of the K branches is connected to the first node formed by the conductive path and one of the two second protection components connected between the total positive line, and the Kth branch of the K branches is connected to the Kth node formed by the conductive path and the other of the two second protection components connected between the total negative line; The second protection component is used to affect the current on the conductive path.

12. The energy storage system according to claim 11, characterized in that: The resistance of each of the first sub-protection components is a first preset resistance, the resistance of two second protection components is equal and greater than or equal to the first preset resistance, or the resistance of the second protection component is half of the first preset resistance.

13. The energy storage system according to claim 12, characterized in that: The resistance of the second protection component is 1.5 times, 2 times, 2.5 times or 3 times the first preset resistance.

14. The energy storage system according to any one of claims 8 to 13, characterized in that: The energy storage system further includes: a plurality of first capacitive components connected in parallel with the plurality of first sub-protection components in a one-to-one correspondence.

15. The energy storage system according to any one of claims 11 to 13, characterized in that: The energy storage system further includes: a plurality of second capacitive components connected in parallel with the plurality of second protection components in a one-to-one correspondence.

16. The energy storage system according to any one of claims 11 to 15, characterized in that: The protection component includes a third protection component, and the third protection component is connected in series on the K branches.

17. The energy storage system according to claim 16, characterized in that: The third protection component includes at least one third sub-protection component, and at least one of the third sub-protection components is respectively connected in series to any at least one of the branches.

18. The energy storage system according to claim 16, characterized in that: The third protection component includes K third sub-protection components, and the K third sub-protection components are respectively connected in series to the K branches.

19. The energy storage system according to claim 17 or 18, characterized in that: The energy storage system further includes: a plurality of third capacitive components connected in parallel with the plurality of third sub-protection components in a one-to-one correspondence.

20. The energy storage system according to any one of claims 1 to 19, characterized in that: The energy storage system further includes a first supporting device, the first supporting device being used to support the N supporting members; The total negative line and the first supporting device are connected to the electrical platform; or The total positive line and the first supporting device are connected to the electrical platform; or Any one of the supporting members is connected to the electrical platform together with the first supporting device.

21. The energy storage system according to claim 20, characterized in that: When N is an even number, the N / 2th and / or N / 2+1th support members and the first support device are connected to the electrical platform together; When N is an odd number, the (N+1) / 2th supporting member and the first supporting device are connected to the electrical platform.

22. The energy storage system according to any one of claims 6 to 21, characterized in that: The protection component includes a current limiting component, and the current limiting component is used to limit the current in the conductive path; or The protection component includes an overcurrent protection component, and the overcurrent protection component is used to perform overcurrent protection on the conductive path.

23. An insulation detection method for an energy storage system according to any one of claims 4 to 22, characterized in that: include: When the first detection switch and the second detection switch are disconnected, obtaining a first voltage between the total positive line and the electrical platform and a second voltage between the total negative line and the electrical platform; When the first detection switch or the second detection switch is closed, obtaining a third voltage between the total positive line and the electrical platform and a fourth voltage between the total negative line and the electrical platform; Based on the first reference resistance, the second reference resistance, the first voltage, the second voltage, the third voltage and the fourth voltage, the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform are calculated.

24. An insulation detection method for an energy storage system according to any one of claims 4 to 22, characterized in that: include: When the first detection switch is turned off and the second detection switch is turned on, obtaining a first voltage drop across the fourth reference resistor and a second voltage drop across the fifth reference resistor; When the first detection switch is turned on and the second detection switch is turned off, obtaining a third voltage drop across the fourth reference resistor and a fourth voltage drop across the fifth reference resistor; Based on the first reference resistance, the second reference resistance, the third reference resistance, the fourth reference resistance, the fifth reference resistance, the sixth reference resistance, the first voltage drop, the second voltage drop, the third voltage drop and the fourth voltage drop, calculate the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform.

25. An insulation detection method for an energy storage system according to any one of claims 5 to 22, characterized in that: include: Controlling the first switch and the second switch to be disconnected; When the first detection switch and the second detection switch are disconnected, obtaining a first voltage between the total positive line and the electrical platform and a second voltage between the total negative line and the electrical platform; When the first detection switch or the second detection switch is closed, obtaining a third voltage between the total positive line and the electrical platform and a fourth voltage between the total negative line and the electrical platform; Based on the first reference resistance, the second reference resistance, the first voltage, the second voltage, the third voltage and the fourth voltage, the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform are calculated.

26. An insulation detection method for an energy storage system according to any one of claims 5 to 22, characterized in that: include: Controlling the first switch and the second switch to be disconnected; When the first detection switch is turned off and the second detection switch is turned on, obtaining a first voltage drop across the fourth reference resistor and a second voltage drop across the fifth reference resistor; When the first detection switch is turned on and the second detection switch is turned off, obtaining a third voltage drop across the fourth reference resistor and a fourth voltage drop across the fifth reference resistor; Based on the first reference resistance, the second reference resistance, the third reference resistance, the fourth reference resistance, the fifth reference resistance, the sixth reference resistance, the first voltage drop, the second voltage drop, the third voltage drop and the fourth voltage drop, calculate the first insulation resistance between the total positive line and the electrical platform and / or the second insulation resistance between the total negative line and the electrical platform.

27. A power supply device, characterized in that: The power supply device comprises the energy storage system according to any one of claims 1 to 22.

Images