Energy storage system and power supply device

Abstract

The utility model discloses an energy storage system and a power supply device, and belongs to the technical field of power supplies. The energy storage system comprises an insulation detection circuit; even if the battery cores of the battery assemblies (namely the battery assemblies at the two ends) close to the main positive line or the main negative line in the battery assemblies connected in series fail to insulate, the change of the insulation parameters of the energy storage system can be accurately detected, so that the insulation failure of the battery cores at all positions can be detected; the problem that the insulation monitoring precision is insufficient due to low insulation resistance drop amplitude caused by insulation failure of the battery cores of the battery assemblies at the two ends is solved; moreover, the insulation monitoring precision is improved, so that the change of the insulation resistance can be identified even if external interference exists.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to an energy storage system and a power supply device. Background Art

[0002] The relevant energy storage system includes multiple battery packs (or battery boxes) connected in series and / or parallel. Its short-circuit protection method is to install a fuse at the positive or negative pole of the energy storage system, or to install 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, if a double-point insulation failure occurs across the battery box, that is, if insulation failure occurs in each of the two battery boxes, the voltage difference is high and the short-circuit current is extremely large, which can easily lead to serious safety issues such as high-voltage ignition and battery combustion and explosion. To address this short circuit, a voltage equalizing chain is currently used to fix the potential of each battery pack shell to solve the problem of battery short circuit caused by insulation failure of multiple battery packs when connected at the same potential.

[0003] After the voltage-equalizing chain is introduced, the insulation test uses the national standard test circuit. The insulation monitoring module (IMM) is connected to the total positive and negative points of the battery system and the midpoint of the voltage-equalizing chain. The switch of the test circuit is switched to calculate the insulation resistance between the total positive and the midpoint, and between the total negative and the midpoint. It is required to be able to detect insulation failures in all battery packs. However, in actual measurements, when the insulation of the battery cells in the battery packs near the two ends fails, the resulting drop in insulation resistance is relatively low. Insulation monitoring boards with insufficient detection accuracy have difficulty detecting the drop in insulation resistance in this case, which can easily lead to safety hazards. In addition, insulation monitoring boards with insufficient detection accuracy may not detect changes in insulation resistance when there is external interference. Utility Model Content

[0004] In view of the above problems, the present application provides an energy storage system and a power supply device, aiming to solve the problem that the insulation monitoring accuracy of the relevant energy storage system is insufficient and the insulation resistance change may not be identified when there is external interference.

[0005] In a first aspect, an embodiment of the present application provides an energy storage system, comprising 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 electrical 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 electrical energy to the battery module through the total positive circuit and the total negative circuit; the battery module comprises a plurality of battery assemblies connected in series; and the energy storage system further comprises:

[0006] A plurality of support members, each battery assembly being supported by each support member in a one-to-one correspondence, each battery assembly being insulated from each support member, a first protection assembly being provided between the support members to form a series connection, the first protection assembly connected in series forming K nodes, the K nodes including K-2 series nodes and a first end node and a second end node respectively located at both ends of the K-2 series nodes, wherein K is a positive integer and K ≥ 3;

[0007] An insulation detection circuit, wherein a first end of the insulation detection circuit is connected to the total positive line, a second end of the insulation detection circuit is connected to the total negative line, and a ground end of the insulation detection circuit is used to be connected to any node. The insulation detection circuit is configured to detect insulation parameters of the energy storage system.

[0008] In the technical solution of the embodiment of the present application, since the battery assembly and the support member are insulated, the protection assembly is connected in series between two adjacent support members. Therefore, in the event of insulation failure of more than one support member, the two support members with insulation failure can avoid short circuit between the two support members based on the protection effect of one or more protection assemblies, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion. In addition, the insulation detection circuit can be switched to connect the node close to the total positive line or close to the total negative line. Even in the battery assembly connected in series, when the insulation of the battery cell fails in the battery assembly close to the total positive line or close to the total negative line (i.e., the battery assembly at both ends), the change in the insulation parameter of the energy storage system can be accurately detected. In this way, the insulation failure of the battery cell at all positions can be detected, which improves the problem of insufficient insulation monitoring accuracy caused by the low insulation resistance drop caused by the insulation failure of the battery cell of the battery assembly at both ends. Moreover, due to the improved accuracy of insulation monitoring, the change in insulation resistance can be identified even in the presence of external interference.

[0009] In some embodiments, the K nodes include K-2 series nodes and a first end node and a second end node located at both ends of the K-2 series nodes respectively, and the ground end of the insulation detection circuit is used to selectively connect to at least one of the K-2 series nodes, namely, a first node close to the total positive line, a second node close to the total negative line, and a third node located in the middle of the conductive path.

[0010] In the technical solution of the embodiment of the present application, the insulation detection circuit can switch and connect the first node and the second node close to the total positive line or close to the total negative line. Then, even when the insulation of the battery cells in the battery assemblies connected in series (i.e., the battery assemblies at both ends) fails, the changes in the insulation parameters of the energy storage system can be accurately detected. In this way, insulation failures in the battery cells at all positions can be detected, which improves the problem of insufficient insulation monitoring accuracy caused by the low drop in insulation resistance when the insulation of the battery cells in the battery assemblies at both ends fails. Moreover, since the accuracy of insulation monitoring is improved, changes in insulation resistance can be identified even in the presence of external interference.

[0011] In some embodiments, the insulation detection circuit includes a switch component, a first end and i second ends of the switch component, the first end is connected to the ground end, the i second ends are selectively connected to the first end, the i second ends include a first terminal, a second terminal, and a third terminal, the first terminal, the second terminal, and the third terminal are respectively connected one-to-one with the first node, the second node, and the third node, where 3≤i≤K.

[0012] In the technical solution of the embodiment of the present application, the connection position of the insulation detection circuit and the conductive path is switched by a switch component. When the insulation of the battery cell of any battery component fails, the change of the insulation parameters of the energy storage system can be accurately detected, thereby improving the accuracy of insulation monitoring.

[0013] In some embodiments, the switch assembly includes i switch devices, the first ends of the i switch devices are connected in common and constitute the first end of the switch assembly, and the second ends of the i switch devices respectively constitute i second ends.

[0014] In the technical solution of the embodiment of the present application, there is provided a method for implementing a switch component using multiple switching devices, wherein the switching devices are, for example, electronic switches such as semiconductor transistors and relays.

[0015] In some embodiments, the switch assembly further includes a moving contact, one end of the moving contact is connected to the first end of the switch assembly, and the other end of the moving contact is used to selectively connect to one of the i second ends.

[0016] In the technical solution of the embodiment of the present application, a switch component is provided that adopts an electronic switch with single-pole multiple-throw multiple functions.

[0017] In some embodiments, the i second ends further include at least one fourth terminal, the fourth terminal is connected to a fourth node, and the fourth node is a node between the first node and the third node in the K-2 series nodes.

[0018] In the technical solution of the embodiment of the present application, the switch component is also provided with a fourth terminal connected to the fourth node between the first node and the third node among the K nodes. When the number of battery components connected in series is large, the accuracy of insulation monitoring can be further improved.

[0019] In some embodiments, the i second ends further include at least one fifth terminal, the fifth terminal is connected to a fifth node, and the fifth node is a node between the second node and the third node in the K-2 series nodes.

[0020] In the technical solution of the embodiment of the present application, the switch component is also provided with a fifth terminal connected to the fifth node between the second node and the third node among the K nodes. When the number of battery components connected in series is large, the accuracy of insulation monitoring can be further improved.

[0021] In some embodiments, the insulation detection circuit further includes a first detection switch, a second detection switch, a first reference resistor, and a second reference resistor;

[0022] A first reference resistor and a first detection switch are connected in series between a first terminal of the insulation detection circuit and a ground terminal;

[0023] The second reference resistor and the second detection switch are connected in series between the second end of the insulation detection circuit and the ground end.

[0024] 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.

[0025] 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;

[0026] A third reference resistor and a fourth reference resistor are connected in series between the first terminal and the ground terminal of the insulation detection circuit;

[0027] The fifth reference resistor and the sixth reference resistor are connected in series between the second terminal of the insulation detection circuit and the ground terminal.

[0028] In the technical solution of the embodiment of the present application, another 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 the relevant electrical parameters on the reference resistor.

[0029] In some embodiments, the number of first protection components is ≤K, and at most one first protection component is connected in series between any two adjacent nodes among the K nodes.

[0030] In the technical solution of the embodiment of the present application, a first protection component can be set every 0 to multiple support members for current limiting, which improves the flexibility of the configuration of the first current limiting protection component.

[0031] In some embodiments, K nodes form K-1 sub-paths, a target sub-path is provided for every m sub-paths, and the target sub-path is connected in series with a first protection component, where m is a natural number.

[0032] In the technical solution of the embodiment of the present application, a first protection component can be set every 0 to multiple sub-paths, which improves the flexibility of the configuration of the first protection component.

[0033] In some embodiments, K-1 first protection components are included, K-1 sub-paths are formed by K nodes, and the K-1 first protection components are respectively connected in series on the K-1 sub-paths.

[0034] In the technical solution of the embodiment of the present application, a first protection component is provided between each adjacent support member. In the event of insulation failure of any support member / battery cell, there is a first protection component for short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0035] In some embodiments, the first node is the first or second serial node among the K-2 serial nodes, and the second node is the K-2 or K-3 serial node among the K-2 serial nodes.

[0036] The technical solution of the embodiment of the present application provides a method for detecting the specific connection position of the insulation parameter change when the insulation failure of the battery cell of the battery assembly close to the total positive line or close to the total negative line is detected.

[0037] In some embodiments, M battery assemblies and N supporting members are included, and K supporting members among the N supporting members are respectively connected to K nodes through K branches, wherein M≥N≥K.

[0038] In some embodiments, the energy storage system 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;

[0039] The first branch among the K branches is connected to one of the two second protection components connected between the first end node and the total positive line, and the Kth branch among the K branches is connected to the other of the two second protection components connected between the second end node and the total negative line.

[0040] 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.

[0041] In some embodiments, the first node and the second node are two end nodes respectively.

[0042] The technical solution of the embodiment of the present application provides a method for detecting the specific connection position of the insulation parameter change when the insulation failure of the battery cell of the battery assembly close to the total positive line or close to the total negative line is detected.

[0043] In some embodiments, the resistance of each first 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.

[0044] 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 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.

[0045] In some embodiments, the resistance of the second protection component is greater than 1.5 times the first preset resistance.

[0046] In the technical solution of the embodiment of the present application, some relationships between the resistance value of the second protection component and the resistance value of the first protection component are provided, which is beneficial to insulation detection and enables insulation failure to be detected more sensitively.

[0047] In some embodiments, a third protection component is further included, and the third protection component is connected in series to at least one of the K branches.

[0048] 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 one or more support members, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion, while making wiring more flexible.

[0049] In some embodiments, a first voltage balancing component and a second voltage balancing component are further included, the first voltage balancing component and the second voltage balancing component are connected in series between the total positive line and the total negative line, and the series node of the first voltage balancing component and the second voltage balancing component is connected to the electrical platform.

[0050] In the technical solution of the embodiment of the present application, a topological structure of an energy storage system is provided, in which two voltage balancing components are used to set a reference potential.

[0051] The energy storage system further includes a first supporting device, the first supporting device being used to support each supporting member;

[0052] The total negative line and the first supporting equipment are connected to the power platform; or

[0053] The total positive line and the first supporting equipment are connected to the power platform; or

[0054] Any one of the supporting members and the first supporting device are connected to the electrical platform.

[0055] 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.

[0056] In some embodiments, when K is an even number, the K / 2th and / or K / 2+1th node is the third node; when K is an odd number, the (K+1) / 2th node is the third node.

[0057] In a second aspect, an embodiment of the present application provides a power supply device, which includes the energy storage system as described above.

[0058] 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

[0059] 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:

[0060] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0061] Figure 2 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0062] Figure 3 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0063] Figure 4 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0064] Figure 5 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0065] Figure 6 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0066] Figure 7 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0067] Figure 8 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0068] Figure 9 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0069] Figure 10 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0070] Figure 11 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0071] Figure 12 A schematic diagram of the structure of the energy storage system provided in some embodiments of the present application. DETAILED DESCRIPTION

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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).

[0078] 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).

[0079] 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.

[0080] To address the problem of reducing short-circuit current in the event of insulation failure in one or more electrical boxes, a voltage-equalizing chain is provided between each battery pack, and a protection component is provided on the voltage-equalizing chain. The protection component is used to suppress the current between one or more electrical boxes when current is flowing, such as in the event of insulation failure in one or more electrical boxes, thereby improving the safety and reliability of the energy storage system. Furthermore, the voltage-equalizing chain can also stabilize the potential of all battery pack shells, while also addressing the problem of floating potential in the battery pack shells. Furthermore, an insulation detection circuit can be provided 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.

[0081] After the voltage-equalizing chain is introduced, the insulation test uses the national standard detection circuit, and the detection circuit is connected to the total positive, total negative and the midpoint of the voltage-equalizing chain of the battery system. The switch of the detection circuit is switched to calculate the insulation resistance from the total positive to the midpoint and the total negative to the midpoint, and it is required to be able to detect insulation failures in battery packs at all positions. However, in actual measurements, in the battery packs connected in series, when the insulation of the battery cells near the two ends fails, the insulation resistance drop caused is relatively low. The insulation monitoring board with insufficient detection accuracy is not enough to detect the insulation resistance drop in this case, which is easy to cause safety hazards. In addition, the insulation monitoring board with insufficient detection accuracy may not be able to detect the change in insulation resistance when there is external interference. In this regard, the inventive concept of the present application is to add several connection points between the ground terminal of the insulation detection circuit and the voltage-equalizing chain, which are respectively connected to the midpoint of the voltage-equalizing chain and the support members at both ends. By switching the connection points, the detection range can be changed, so that insulation failures in the battery cells at all positions can be detected. At this time, the grounding point of the insulation detection board is not connected to the power platform, and is basically not affected by the platform potential fluctuation.

[0082] According to some embodiments of the present application, referring to Figure 1 , Figure 1 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0083] 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-. The battery module includes multiple battery assemblies 11 connected in series; the energy storage system also includes: multiple support members 12, a first protection assembly 131, and an insulation detection circuit 14.

[0084] Each battery assembly 11 is supported by each support member 12 in a one-to-one correspondence. Each battery assembly 11 is insulated from each support member 12. A first protection assembly 131 is provided between the supports 12 to form a series connection. The first protection assembly 131 connected in series forms K nodes X1 to Xk, where K is a positive integer and K ≥ 3.

[0085] The first end of the insulation detection circuit 14 is connected to the total positive line V+, the second end of the insulation detection circuit 14 is connected to the total negative line V-, and the ground end of the insulation detection circuit 14 is used to be connected to any node among the K nodes X1~Xk. The insulation detection circuit 14 is configured to detect the insulation parameters of the energy storage system.

[0086] It is understood that the total positive line V+ and the total negative line V- are used to input or output power. The battery assembly 11 includes one or more battery cells connected in parallel and / or in series. The support member 12 includes a housing (also called an electrical box) or a cold plate, both of which 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 below the battery assembly 11. Its primary function is to conduct heat away from the battery, maintaining a stable battery temperature and thereby improving battery efficiency. Each support member 12 can support one or more battery assemblies 11.

[0087] Each first protection component 131 is connected between two spaced support members 12 (separated by zero or more support members 12), and multiple first protection components 131 are connected in series to form a conductive path 13. The lines or terminals connecting a first protection component 131 to a support member 12 or an adjacent first protection component 131 can serve as nodes X1-Xk, or the connected support member 12 can also serve as the node X1-Xk. For example, K-1 first protection components 131 connected in series on the conductive path 13 will form K nodes X1-Xk.

[0088] Exemplarily, the support member 12 is connected to the corresponding nodes X1 to Xk via a branch circuit. Alternatively, the branch circuit can also serve as the node X1 to Xk. The branch circuit can be formed by a conductive circuit, or can include a conductive circuit and other conductive elements.

[0089] The insulation parameters of the energy storage system include, for example, the insulation resistance between the total positive line V+ and the total negative line V−, the insulation resistance between the total positive line V+ and the ground terminal of the insulation detection circuit 14, and the insulation resistance between the total negative line V− and the ground terminal of the insulation detection circuit 14.

[0090] In the technical solution of the embodiment of the present application, since the battery assembly 11 and the support member 12 are insulated, the first protection component 131 is connected in series between two adjacent support members 12. Therefore, in the event that the insulation of more than one support member 12 fails, the two support members 12 with insulation failure can avoid short circuit between the two support members 12 with insulation failure based on the protection effect of one or more first protection components 131, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0091] In the technical solution of the embodiment of the present application, the insulation detection circuit 14 can be switched to connect the nodes Xa and Xb close to the total positive line V+ or close to the total negative line V-. Then, even when the insulation of the battery cells in the battery assemblies 11 connected in series near the total positive line V+ or near the total negative line V- (i.e., the battery assemblies at both ends) fails, the changes in the insulation parameters of the energy storage system can be accurately detected. In this way, insulation failures in the battery cells at all positions can be detected, which improves the problem of insufficient insulation monitoring accuracy caused by the low drop in insulation resistance when the insulation of the battery cells in the battery assemblies 11 at both ends fails. Moreover, due to the improved accuracy of insulation monitoring, changes in insulation resistance can be identified even in the presence of external interference.

[0092] In some embodiments, the ground terminal of the insulation detection circuit 14 can be connected to one of the nodes Xa and Xb close to the total positive line V+ or close to the total negative line V- by switching, and can also be connected to other nodes among the K nodes X1~Xk according to actual needs to flexibly improve the insulation monitoring accuracy.

[0093] In some embodiments, the K nodes X1~Xk include K-2 series nodes and a first end node X1 and a second end node Xk located at both ends of the K-2 series nodes, respectively. The ground end of the insulation detection circuit 14 is used to selectively connect to at least one of the K-2 series nodes, namely, a first node Xa close to the total positive line V+, a second node Xb close to the total negative line V-, and a first protection component 131 connected in series, that is, a third node Xc in the middle of the conductive path 13.

[0094] In the technical solution of the embodiment of the present application, the insulation detection circuit 14 can switch and connect the first node Xa and the second node Xb close to the total positive line V+ or close to the total negative line V-. Then, even when the insulation of the battery cells in the battery assembly 11 close to the total positive line V+ or close to the total negative line V- (i.e., the battery assembly at both ends) in the series connection fails, the change in the insulation parameters of the energy storage system can be accurately detected. In this way, insulation failure of the battery cells at all positions can be detected, which improves the problem of insufficient insulation monitoring accuracy caused by the low drop in insulation resistance when the insulation of the battery cells in the battery assembly 11 at both ends fails. Moreover, due to the improved accuracy of insulation monitoring, changes in insulation resistance can be identified even in the presence of external interference.

[0095] According to some embodiments of the present application, referring to Figure 2 , Figure 2 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0096] The insulation detection circuit 14 includes a switch component 140, which includes a first end 141 and i second ends 142. The first end 141 is connected to the ground end of the insulation detection circuit 14, and the i second ends 142 are selectively connected to the first end 141. The i second ends 142 include a first terminal, a second terminal, and a third terminal. The first terminal, the second terminal, and the third terminal are respectively connected to the first node Xa, the second node Xb, and the third node Xc, where 3≤i≤K.

[0097] The switch assembly 140 includes multiple relays or integrated electronic switches and can be installed on the circuit board (also known as the IMM board) of the insulation detection circuit 14, or it can be installed outside the IMM board and located within the main control box. For example, a slave battery management unit (SBMU) sends a signal to control the connection between the second terminal 142 and the first terminal 141; alternatively, a drive signal source built into the insulation detection circuit 14 controls the connection between the second terminal 142 and the first terminal 141.

[0098] In the technical solution of the embodiment of the present application, the connection between the insulation detection circuit 14 and the node on the conductive path 13 is switched by a switch component. When the insulation of the battery cell of any battery component 11 fails, the change of the insulation parameter of the energy storage system can be accurately detected, thereby improving the accuracy of insulation monitoring.

[0099] According to some embodiments of this application, please continue to refer to Figure 2 The switch assembly 140 further includes a movable contact 143, one end of which is connected to the first end of the switch assembly 140, and the other end of which is configured to selectively connect to one of the i second ends 142. In this embodiment, the switch assembly 140 may be an integrated electronic switch having a single-pole, multiple-throw (SPMT) function, such as a multi-position rotary switch.

[0100] According to some embodiments of the present application, referring to Figure 3 , Figure 3 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0101] In some embodiments, the switch assembly 140 includes i switching devices S1-S3, wherein the first ends of the i switching devices S1-S3 are connected in common and constitute a first end 141 of the switch assembly 140, and the second ends of the i switching devices S1-S3 respectively constitute i second ends 142. The switching devices S1-S3 are, for example, electronic switches such as semiconductor transistors and relays.

[0102] In the technical solution of the embodiment of the present application, a switch assembly 140 is provided that adopts a plurality of switch devices S1 to S3 , which has low cost, simple and reliable structure.

[0103] According to some embodiments of the present application, referring to Figure 4 , Figure 4 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0104] In some embodiments, in order to improve the detection range and detection accuracy, the i second ends 142 also include at least one fourth terminal, which is connected to the fourth node Xd. The fourth node Xd is a node between the first node Xa and the third node Xc among the K nodes X1~Xk.

[0105] In the technical solution of the embodiment of the present application, the switch component 140 is also provided with a fourth terminal connected to the fourth node Xd between the first node Xa and the third node Xc among the K nodes X1~Xk. When the number of battery components 11 connected in series is large, the accuracy of insulation monitoring can be further improved.

[0106] According to some embodiments of this application, please continue to refer to Figure 4 In some embodiments, in order to improve the detection range and detection accuracy, the i second ends 142 further include at least one fifth terminal, which is connected to the fifth node Xe. The fifth node Xe is a node between the second node Xb and the third node Xc among the K nodes X1~Xk.

[0107] In the technical solution of the embodiment of the present application, the switch component 140 is also provided with a fifth terminal connected to the fifth node Xe between the second node Xb and the third node Xc among the K nodes X1~Xk. When the number of battery components 11 connected in series is large, the accuracy of insulation monitoring can be further improved.

[0108] According to some embodiments of the present application, referring to Figure 5 , Figure 5 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0109] 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;

[0110] The first reference resistor Rm1 and the first detection switch K1 are connected in series between the first terminal of the insulation detection circuit 14 (i.e. connected to the total positive line V+) and the ground terminal;

[0111] The second reference resistor Rm2 and the second detection switch K2 are connected in series between the second end of the insulation detection circuit 14 (ie, connected to the total negative line V−) and the ground end.

[0112] Illustratively, the first detection switch K1 and the second detection switch K2 are, for example, semiconductor transistors, relays, contactors, or circuit breakers.

[0113] 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.

[0114] According to some embodiments of the present application, referring to Figure 6 , Figure 6 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0115] The insulation detection circuit further includes a third reference resistor Rm3, a fourth reference resistor Rm4, a fifth reference resistor Rm5 and a sixth reference resistor Rm6;

[0116] The third reference resistor Rm3 and the fourth reference resistor Rm4 are connected in series between the first terminal and the ground terminal of the insulation detection circuit 14;

[0117] The fifth reference resistor Rm5 and the sixth reference resistor Rm6 are connected in series between the second terminal of the insulation detection circuit and the ground terminal.

[0118] In the technical solution of the embodiment of the present application, another 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 the relevant electrical parameters on the reference resistor.

[0119] According to some embodiments of this application, please refer to Figure 5 and Figure 6The 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. The ground terminal of the insulation detection circuit 14 is connected to any node between the first node Xa and the fifth node Xe. It is assumed that an equivalent first insulation resistance Rx is formed between the total positive line V+ and the ground terminal of the insulation detection circuit 14, and an equivalent second insulation resistance Ry is formed between the total negative line V- and the ground terminal of the insulation detection circuit 14.

[0120] Example 1, please refer to Figure 5 When the first detection switch K1 and the second detection switch K2 are open, the voltage V1 between the total positive line V+ and the ground terminal and the voltage V2 between the total negative line V- and the ground terminal are detected. When the first detection switch K1 is closed (in other examples, the second detection switch K2 can be closed), the voltage V1' between the total positive line V+ and the ground terminal and the voltage V2' between the total negative line V- and the ground terminal are detected, and the values ​​of the two insulation resistances are derived:

[0121] (1)

[0122] ) (2)

[0123] Example 2, please refer to Figure 5 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 is obtained:

[0124] (3)

[0125] 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:

[0126] (4)

[0127] The resistance values ​​of the two insulation resistors are derived according to formulas (3) and (4).

[0128] 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.

[0129] According to some embodiments of this application, please refer to Figures 1 to 6The number of first protection components 131 is ≤K-1, and at most one first protection component 131 is connected in series between any two adjacent nodes among the K nodes X1 to Xk.

[0130] In the technical solution of the embodiment of the present application, a first protection component 131 can be provided every 0 to multiple support members 12. The first protection component 131 can include a current limiting component and / or an overcurrent protection component, thereby improving the flexibility of the configuration of the first protection component 131.

[0131] It is understandable that there can be any number of first protection components 131, which can be connected in series at any two nodes X. When there are two support members 12, there is one first protection component 131; when there are three or more support members 12, there can be one or more first protection components 131.

[0132] In some embodiments, K nodes X1 to Xk form K-1 sub-paths, a target sub-path is provided for every m sub-paths, and the target sub-path is connected in series with the first protection component 131 , where m is a natural number.

[0133] It can be understood that at this time, the first protection components 131 are evenly distributed among the multiple support members 12. Due to the protective effect of one or more first protection components 131, the short-circuit current is reduced, and the evenly distributed first protection components 131 further reduce the possibility of causing high-voltage ignition and battery combustion and explosion.

[0134] In the technical solution of the embodiment of the present application, the first protection component 131 can be set every 0 to multiple sub-paths, which improves the flexibility of the configuration of the first protection component.

[0135] In some embodiments, K nodes X1 to Xk form K-1 sub-paths, and the first protection component includes K-1 first protection components, and the K-1 first protection components are respectively connected in series on the K-1 sub-paths.

[0136] The first protection component 131 is connected in series between K nodes X1~Xk. In the event of insulation failure of one or more battery components 11, the first protection component 131 can suppress the short-circuit current, reducing the possibility of high-voltage ignition and battery combustion and explosion. At the same time, the number of connecting wires is reduced, which reduces the installation workload.

[0137] Based on the insulation setting of the battery assembly 11 and the support member 12, in the event of insulation failure of more than one battery assembly 11, that is, in the event of insulation failure of more than one support member 12, the first protection component 131 on the conductive path 13 can bear the short-circuit current caused by the insulation failure, thereby playing a short-circuit protection role and reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0138] In the technical solution of the embodiment of the present application, a first protection component 131 is provided between each adjacent support member 12. In the event of insulation failure of any support member 12 / battery cell, there is a first protection component 131 for short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0139] According to some embodiments of the present application, referring to Figure 7 , Figure 7 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0140] The first node Xa is the second or third node among the K nodes X1 to Xk, and the second node Xb′ is the K−1th or K−2th node among the K nodes X1 to Xk.

[0141] Exemplarily, the first node Xa is the second of the K nodes X1 to Xk, and the second node Xb is the K-1th of the K nodes X1 to Xk. The battery module contains nine battery packs 11, designated Pack 1 through Pack 9. By switching the ground terminal of the insulation detection circuit 14 with the midpoint of the conductive path 13 (or voltage-sharing link) (i.e., the third node Xc), the Pack 1 box (i.e., the first node Xa), and the Pack 9 box (i.e., the second node Xb), the detection range can be changed. Exemplarily, if the ground terminal of the insulation detection circuit 14 is connected only to the third node Xc, the detection range of the insulation detection circuit 14 is Packs 3-7; if the ground terminal of the insulation detection circuit 14 is connected only to the first node Xa, the detection range of the insulation detection circuit 14 is Packs 1-3; and if the ground terminal of the insulation detection circuit 14 is connected only to the second node Xb, the detection range of the insulation detection circuit 14 is Packs 7-9.

[0142] In the technical solution of the embodiment of the present application, an insulation detection circuit is provided to detect the specific connection position of the insulation parameter change when the insulation failure of the battery cell of the battery assembly 11 close to the total positive line V+ or close to the total negative line V- is detected.

[0143] In some embodiments, M battery assemblies 11 and N support members 12 are included, and K support members 12 among the N support members 12 are respectively connected to K nodes X1 to Xk through K branches, where M≥N≥K.

[0144] According to some embodiments of the present application, referring to Figure 8 and Figure 9 , Figure 8 FIG2 shows a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application. Figure 9A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown; for ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0145] The energy storage system further includes two second protection components 132; the positive electrode of the first battery component 11 is connected to the total positive line V+, and the negative electrode of the Mth battery component 11 is connected to the total negative line V-;

[0146] The first of the K branches is connected to one of the two second protection components 132 connected between the first end node X1 and the total positive line V+, and the Kth branch of the K branches is connected to the other of the two second protection components 132 connected between the second end node Xk and the total negative line V-; the second protection component 132 is used to affect the current on the conductive path.

[0147] For example, in a battery module, the first battery assembly 11 and the M-th battery assembly 11 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 11 is supported by the first support member 12, and the M-th battery assembly 11 is supported by the N-th support member 12.

[0148] For example, the second protection component 132 may include a current limiting component and / or an overcurrent component. A plurality of first sub-protection components and two second protection components 132 form a voltage balancing chain to balance the voltage between each two adjacent support members 12 .

[0149] For example, when K=N, the first support member 12 and the Nth support member 12 are connected to the first end node X1 and the second end node Xk on the conductive path 13, respectively. That is, the first support member 12 has the same potential as the first end node X1, and the Nth support member 12 has the same potential as the second end node Xk. Then, there are at least two situations in which the first end node X1 and the second end node Xk are connected to the total positive line V+ and the total negative line V- respectively through the two second protection components 132. For example Figure 8 In the example, the first end node X1 and the second end node Xk are directly connected to the total positive line V+ and the total negative line V- through two second protection components 132, and the first support member 12 and the Nth support member 12 are electrically connected to the total positive line V+ and the total negative line V- respectively. Figure 9 In the example, the two second protection components 132 are respectively arranged on the first support member 12 and the Nth support member 12, and the first support member 12 and the Nth support member 12 are respectively connected to the total positive line V+ and the total negative line V-.

[0150] In the technical solution of the embodiment of the present application, a second protection component 132 is connected in series between the first support member 12 and the total positive line V+ and between the Nth support member 12 and the total negative line V-. In the event of insulation failure of the first support member 12 and / or the Nth support member 12, there is a second protection component 132 to suppress the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0151] In the technical solution of the embodiment of the present application, a second protection component 132 is connected in series between the first support member 12 and the total positive line V+ and between the Nth support member 12 and the total negative line V-. In the event of insulation failure of the first support member 12 and / or the Nth support member 12, there is a second protection component 132 to suppress the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0152] According to some embodiments of this application, please continue to refer to Figure 8 and Figure 9 , the first node Xa and the second node Xb are the first end node X1 and the second end node Xk respectively.

[0153] In the technical solution of the embodiment of the present application, an insulation detection circuit is provided to detect the specific connection position of the insulation parameter change when the insulation failure of the battery cell of the battery assembly 11 close to the total positive line V+ or close to the total negative line V- is detected.

[0154] In some embodiments, the resistance of each first protection component 131 is a first preset resistance, the resistance of the two second protection components 132 is equal and greater than or equal to the first preset resistance, or the resistance of the second protection component 132 is half of the first preset resistance.

[0155] The first protection component 131 has a uniform resistance, and the second protection component 132 has a resistance that 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.

[0156] In some embodiments, when m is 0, the resistance of each first protection component 131 is the first preset resistance R; when m is greater than 0, the resistance of each first protection component 131 is the first configured resistance mR;

[0157] Exemplarily, when m is 0, the resistance of the second protection component 132 is 1.5 times, 2 times, 2.5 times, or 3 times the first preset resistance.

[0158] The voltage difference between each adjacent support member 12 is Vbus / N. When the resistance values ​​of the two second protection components 132 are both twice the first preset resistance value, the voltage difference between the first support member 12 and the total positive line V+ is 2Vbus / N; the voltage difference between the Nth support member 12 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+.

[0159] Among them, setting the resistance of the second protection component 132 to a resistance greater than the resistance of the first protection component 131 can improve the sensitivity of insulation failure detection compared to setting the resistance of the second protection component 132 to a resistance less than or equal to the resistance of the first protection component 131, and insulation failure can be more easily discovered.

[0160] When m is greater than 0, the voltage drop across each first protection component 131 is m*Vbus / N. The voltage drops across each first protection component 131 are equal, 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.

[0161] 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 protection components 131 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 132 to be greater than or equal to the first predetermined resistance facilitates insulation detection, enabling more sensitive detection of insulation failures.

[0162] In the technical solution of the embodiment of the present application, some relationships between the resistance of the second protection component 132 and the resistance of the first protection component 131 are provided, which is beneficial to insulation detection and enables insulation failure to be detected more sensitively.

[0163] According to some embodiments of the present application, referring to Figure 10 , Figure 10 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0164] The energy storage system further includes a third protection component 133 , and the third protection component 133 is connected in series to at least one of the K branches.

[0165] The third protection component 133 may include a current limiting component and / or an overcurrent component. It is understood that Figure 10 In the example, K branch conductive paths 13 form K nodes X1 to Xk, and any number of first protection components 131 can be set between any nodes X. For details, please refer to the above embodiments.

[0166] In the technical solution of the embodiment of the present application, the third protection component 133 is set on K branches and is used for short-circuit protection in the event of insulation failure of more than one electrical box (support member 12), thereby reducing the possibility of high-voltage ignition and battery combustion and explosion, and making wiring more flexible.

[0167] In some embodiments, the third protection component 133 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.

[0168] In the technical solution of the embodiment of the present application, the number of third sub-protection components configured can be reduced, saving costs.

[0169] In some embodiments, the third protection component 133 includes K third sub-protection components, and the K third sub-protection components are respectively connected in series to K branches.

[0170] 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.

[0171] In the technical solution of the embodiment of the present application, a third sub-protection component is provided between each adjacent support member 12. In the event of insulation failure of any support member 12, there are at least two overcurrent third protection components 133 to provide short-circuit protection, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0172] In some embodiments, the energy storage system further includes a capacitive component (not shown). Each of the first protection component 131, the second protection component 132, and the third protection component 133 is connected in parallel with a capacitive component in a one-to-one correspondence. The capacitive component is, for example, a capacitor.

[0173] In the technical solution of the embodiment of the present application, in the event of lightning strikes, surges, etc., each capacitive component suppresses the voltage spike on each protection component, reducing the possibility of protection component breakdown and improving the reliability of the energy storage system.

[0174] According to some embodiments of the present application, referring to Figure 11 , Figure 11 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0175] The energy storage system also includes a first voltage balancing component R11 and a second voltage balancing component R12, which are connected in series between the total positive line and the total negative line, and the series node of the first voltage balancing component R11 and the second voltage balancing component R12 is connected to the electric platform.

[0176] In the technical solution of the embodiment of the present application, a topological structure of an energy storage system is provided, in which two voltage balancing components are used to set a reference potential.

[0177] According to some embodiments of this application, please refer to Figure 12 , Figure 12 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application is shown. For ease of explanation, only the parts related to this embodiment are shown, which are detailed as follows:

[0178] The energy storage system further includes a first supporting device 20, the first supporting device 20 being used to support N supporting members;

[0179] The total negative line V- and the first supporting device 20 are connected to the electrical platform 30; or

[0180] The total positive line V+ and the first supporting device 20 are connected to the electrical platform 30; or

[0181] Any one of the supporting members 12 and the first supporting device 20 are connected to the electrical platform 30 .

[0182] 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 .

[0183] Any node of the voltage-equalizing chain can be connected to the electrical platform 30. 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 electrical platform 30, thereby adapting to various application scenarios and enriching the functions of the product.

[0184] 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 30; or because the total positive line V+ and the first supporting device 20 are connected to the electrical platform 30; or any one of the supporting members and the first supporting device 20 are connected to the electrical platform 30; 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.

[0185] According to some embodiments of this application, please continue to refer to Figure 12 , 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 30;

[0186] When N is an odd number, the (N+1) / 2th support member 12 and the first support device 20 are connected to the electrical platform 30 .

[0187] It can be understood that when N is an odd number, the voltage between the electrical platform 30 and the total positive line V+ is a first voltage value, and the voltage between the electrical platform 30 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 electrical platform 30 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 electrical platform 30 and the total positive line V+ is a first voltage value, and the voltage between the electrical platform 30 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 electrical platform 30 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.

[0188] In the technical solution of the embodiment of the present application, when the insulation detection circuit 14 is operating, the midpoint of the voltage grading chain (i.e., the third node Xc) is disconnected from the electrical platform 30. Voltage fluctuations on the electrical platform 30 substantially do not affect the potential of the ground terminal of the insulation detection circuit 14, and thus substantially do not affect the equivalent insulation resistance measured by the insulation detection circuit 14, thereby improving detection accuracy.

[0189] In the technical solution of the embodiment of the present application, when the insulation detection circuit 14 is not working, the middlemost support member 12 and the first support device 20 are connected to the electrical platform 30, so that when the electrical platform 30 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.

[0190] As those skilled in the art will appreciate, the electrical platform 30 can be assigned a potential and / or provided with a potential. For example, when the electrical platform 30 is grounded, devices connected to the electrical platform 30 (e.g., the battery enclosure) are generally also considered grounded. In this example, the electrical platform 30 is assigned a ground potential through grounding, and the devices connected to the electrical platform 30 are provided with a ground potential by the electrical platform 30. For another example, when the electrical platform 30 is connected to the electrical cabinet's main positive line V+, the electrical platform 30 can be considered assigned the main positive line V+ potential. If a device (e.g., the battery enclosure) is connected to the electrical platform 30, the device can be considered provided with the main positive line V+ potential by the electrical platform 30. For example, the electrical platform 30 can be an object with equal potential, ensuring that devices connected to the electrical platform 30 are at the same potential. For example, the electrical platform 30 can be a power ground or a conductor connected to the power ground, or it can be a mounting platform for the energy storage system.

[0191] According to some embodiments of the present application, when K is an even number, the K / 2th and / or K / 2+1th node is the third node Xc; when K is an odd number, the (K+1) / 2th node is the third node Xc.

[0192] In some embodiments, each protection component (ie, including 131 , 132 , 133 ) includes a current limiting component, and the current limiting component is used to limit the current of the conductive path 13 ; or

[0193] Each protection component includes an overcurrent protection component, which is used to perform overcurrent protection on the current in the conductive path 13 .

[0194] 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.

[0195] 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.

[0196] In the technical solution of the embodiment of the present application, each protection component can be a current limiting component or an overcurrent protection component, which improves the flexibility of the protection component configuration.

[0197] In some embodiments, 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 30 ;

[0198] When N is an odd number, the (N+1) / 2th support member 12 and the first support device 20 are connected to the electrical platform 30 .

[0199] In the technical solution of the embodiment of the present application, the middlemost support member 12 and the first support device 20 are connected to the electrical platform 30, so that when the electrical platform 30 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.

[0200] It can be understood that when N is an even number, the third node Xc is connected to the N / 2th and / or N / 2+1th support member 12 , and when N is an odd number, the third node Xc is connected to the (N+1) / 2th support member 12 .

[0201] In a second aspect, an embodiment of the present application provides a power supply device, which includes the energy storage system as described above.

[0202] 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.

[0203] 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.

[0204] Since the power supply device includes the energy storage system of any of the above solutions, it can provide overcurrent protection for short-circuit current, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0205] 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 a plurality of battery assemblies connected in series; the energy storage system also includes: A plurality of support members, each of the battery assemblies is supported by each of the support members, each of the battery assemblies is insulated from each of the support members, and a first protection assembly connected in series is arranged between the support members, and the first protection assembly connected in series forms K nodes, wherein K is a positive integer, and K≥3; An insulation detection circuit, wherein a first end of the insulation detection circuit is connected to the total positive line, a second end of the insulation detection circuit is connected to the total negative line, a ground end of the insulation detection circuit is used to be connected to any one of the K nodes, and the insulation detection circuit is configured to detect insulation parameters of the energy storage system.

2. The energy storage system according to claim 1, characterized in that: The K nodes include K-2 series nodes and a first end node and a second end node respectively located at both ends of the K-2 series nodes. The ground terminal of the insulation detection circuit is used to selectively connect with at least one of the K nodes, namely, a first node close to the total positive line, a second node close to the total negative line, and a third node located in the middle of the first protection component connected in series.

3. The energy storage system according to claim 2, characterized in that: The insulation detection circuit includes a switch component, the switch component includes a first end and i second ends, the first end is connected to the ground end, the i second ends are selectively connected to the first end, the i second ends include a first terminal, a second terminal, and a third terminal, the first terminal, the second terminal, and the third terminal are respectively connected to the first node, the second node, and the third node in a one-to-one correspondence, wherein 3≤i≤K.

4. The energy storage system according to claim 3, characterized in that: The switch assembly includes i switch devices, the first ends of the i switch devices are connected in common and constitute the first end of the switch assembly, and the second ends of the i switch devices respectively constitute the i second ends.

5. The energy storage system according to claim 3, characterized in that: The switch assembly further includes a moving contact, one end of which is connected to the first end of the switch assembly, and the other end of which is used to be connected to one of the i second ends.

6. The energy storage system according to claim 3, characterized in that: The i second ends further include at least one fourth terminal, the fourth terminal is connected to a fourth node, and the fourth node is a node between the first node and the third node among the K-2 series nodes.

7. The energy storage system according to claim 3, characterized in that: The i second ends further include at least one fifth terminal, the fifth terminal is connected to a fifth node, and the fifth node is a node between the second node and the third node among the K-2 series nodes.

8. The energy storage system according to any one of claims 1 to 7, characterized in that: The insulation detection circuit also includes a first detection switch, a second detection switch, a first reference resistor and a second reference resistor; The first reference resistor and the first detection switch are connected in series between the first end of the insulation detection circuit and the ground end; The second reference resistor and the second detection switch are connected in series between the second end of the insulation detection circuit and the ground end.

9. The energy storage system according to claim 8, 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 first end and the ground end of the insulation detection circuit; The fifth reference resistor and the sixth reference resistor are connected in series between the second end of the insulation detection circuit and the ground end.

10. The energy storage system according to claim 2, characterized in that: The number of the first protection components is ≤K-1, and at most one first protection component is connected in series between any two adjacent nodes among the K nodes.

11. The energy storage system according to claim 2, characterized in that: The K nodes form K-1 sub-passes, and a target sub-passage is provided for every m sub-passes. The target sub-passage is connected in series with the first protection component, and m is a natural number.

12. The energy storage system according to claim 2, characterized in that: It comprises K-1 first protection components, K-1 sub-paths formed by the K nodes, and the K-1 first protection components are respectively connected in series on the K-1 sub-paths.

13. The energy storage system according to any one of claims 10 to 12, characterized in that: The first node is the first series node among the K-2 series nodes, and the second node is the K-2 series node among the K-2 series nodes.

14. The energy storage system according to any one of claims 2 to 7 and 10 to 12, characterized in that: It comprises M battery assemblies and N support members, wherein K support members among the N support members are respectively connected to the K nodes through K branches, wherein M≥N≥K; The energy storage system further includes two second protection components; the positive electrode of the first battery component is connected to the total positive circuit, and the negative electrode of the Mth battery component is connected to the total negative circuit; The first branch among the K branches is connected to one of the two second protection components connected between the first end node and the total positive line, and the Kth branch among the K branches is connected to the other of the two second protection components connected between the second end node and the total negative line.

15. The energy storage system according to claim 14, characterized in that: The first node and the second node are respectively the first end node and the second end node.

16. The energy storage system according to claim 14, characterized in that: The resistance of each of the first protection components is a first preset resistance, the resistance of two of the 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.

17. The energy storage system according to claim 16, characterized in that: The resistance of the second protection component is greater than 1.5 times the first preset resistance.

18. The energy storage system according to any one of claims 1 to 7 and 10 to 12, characterized in that: It also includes a third protection component. Each of the support members is connected to the K nodes via K branches, and the third protection component is connected in series on at least one of the K branches.

19. The energy storage system according to any one of claims 1 to 7 and 10 to 12, characterized in that: It also includes a first voltage balancing component and a second voltage balancing component, wherein the first voltage balancing component and the second voltage balancing component are connected in series between the total positive line and the total negative line, and the series node of the first voltage balancing component and the second voltage balancing component is connected to an electrical platform.

20. The energy storage system according to any one of claims 1 to 7 and 10 to 12, characterized in that: The energy storage system further comprises a first supporting device, wherein the first supporting device is used to support each of the 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 2, characterized in that: When K is an even number, the K / 2th and / or K / 2+1th node is the third node; when K is an odd number, the (K+1) / 2th node is the third node.

22. A power supply device, characterized in that: The power supply device comprises the energy storage system according to any one of claims 1 to 21.

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