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 is connected with a connection node of a protection assembly through a grounding end of a first insulation detection circuit, voltage can be sampled, and insulation parameters between a total positive line and the connection node and between a total negative line and the connection node are detected; the grounding end of the second insulation detection circuit is connected with the electric platform, and the second insulation detection circuit can sample voltage and detect insulation parameters between the total positive line and the electric platform and between the total negative line and the electric platform. Therefore, resistance change caused by insulation failure at each position of the direct current side of the energy storage system can be detected, and mutual interference is avoided.

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 in parallel. The short-circuit protection method is to set a fuse at the positive electrode or the negative electrode 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 when a short circuit occurs between the positive electrode and the negative electrode of the energy storage system. However, when a double-point insulation failure occurs across the battery box, that is, when insulation failure occurs in two battery boxes respectively, 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. In response to this defect, a voltage equalizing chain is currently used to fix the potential of each battery pack shell to solve the problem that insulation failure of multiple battery packs during equal potential connection will cause battery short circuit.

[0003] However, after configuring the voltage balancing chain, the insulation monitoring module (IMM) is connected to the total positive, total negative and midpoint of the voltage balancing chain of the battery system. At this time, the midpoint of the voltage balancing chain is not connected to the power platform, and only the equivalent resistance from the total positive / total negative to the midpoint of the voltage balancing chain can be detected, but the equivalent resistance from the total positive / total negative to the power platform cannot be detected, that is, the detection range does not include all positions on the DC side. 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 of insufficient IMM detection range after the relevant energy storage system is configured with a voltage balancing chain.

[0005] In a first aspect, an embodiment of the present application provides an energy storage system, including 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 battery module includes a plurality of battery assemblies connected in series; the energy storage system further includes:

[0006] A plurality of support members, each battery assembly is supported by each support member in a one-to-one correspondence, each battery assembly is insulated from each support member, at least one protection assembly is arranged between any two support members, and at least one node is formed between at least one protection assembly;

[0007] a first insulation detection circuit, wherein a first end of the first insulation detection circuit is connected to the total positive line, a second end of the first insulation detection circuit is connected to the total negative line, a ground end of the first insulation detection circuit is connected to a connection node, and at least one node includes the connection node;

[0008] A second insulation detection circuit, wherein the first end of the second insulation detection circuit is connected to the total positive line, the second end of the second insulation detection circuit is connected to the total negative line, and the ground end of the second insulation detection circuit is connected to the electrical platform.

[0009] In the technical solution of the embodiment of the present application, since the battery assembly is insulated from the support, the protection assembly is connected in series between two adjacent support members, so that in the case of insulation failure of more than one support, 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 ground terminal of the first insulation detection circuit is connected to the connection node of the protection assembly, and the voltage can be sampled, and the insulation parameters between the total positive line and the connection node and between the total negative line and the connection node can be detected; the ground terminal of the second insulation detection circuit is connected to the electric platform, and the voltage can be sampled, and the insulation parameters between the total positive line and the electric platform and between the total negative line and the electric platform can be detected. In this way, the resistance changes caused by insulation failure at various positions on the DC side of the energy storage system can be detected without mutual interference.

[0010] In some embodiments, a voltage balancing circuit is also included, where the voltage balancing circuit is connected between the total positive line and the total negative line, and the midpoint of the voltage balancing circuit is connected to the electrical platform.

[0011] In the technical solution of the embodiment of the present application, a voltage equalizing circuit is used to determine the electric platform potential of the energy storage system.

[0012] In some embodiments, the voltage equalizing circuit includes a first voltage equalizing component and a second voltage equalizing component, the first voltage equalizing component and the second voltage equalizing component are connected in series between the total positive line and the total negative line, and the series node of the first voltage equalizing component and the second voltage equalizing component constitutes the midpoint of the voltage equalizing circuit.

[0013] In the technical solution of the embodiment of the present application, two voltage balancing components are used to determine the potential of the electric platform.

[0014] In some embodiments, a supporting device is also included, in which the battery module, the supporting member and the first insulation detection circuit are arranged inside the supporting device, and the supporting device is used to insulately support the supporting member and the first insulation detection circuit, and the supporting device is also connected to the electrical platform.

[0015] In the technical solution of the embodiment of the present application, a battery module is arranged in a supporting device, and the supporting member and the first insulation detection circuit are insulated from the supporting device, so that the insulation parameters between the total positive line and the connection node and between the total negative line and the connection node can be detected by the first insulation detection circuit without being interfered by the electrical signal of the supporting device; and the supporting device is connected to the electrical platform, so that the potential of the supporting device is not floating, and its insulation parameters can be detected by the second insulation detection circuit without being interfered by the electrical signal of the supporting member.

[0016] In some embodiments, the supporting device further comprises a first supporting means, the first insulation detection circuit is insulated and supported by the first supporting means, and the first supporting means and the supporting device are connected to the electrical platform.

[0017] In the technical solution of the embodiment of the present application, similarly, the first supporting device is connected to the electric platform so that the potential of the first supporting device is not floating, and its insulation parameters can be detected by the second insulation detection circuit without being interfered by the electrical signal of the supporting member.

[0018] In some embodiments, the first supporting device is also provided with an auxiliary battery management device (Slave Battery Management Unit, SBMU), which is insulated and supported by the first supporting device. The auxiliary battery management device is connected to the first insulation detection circuit and is used to control the first insulation detection circuit to detect the insulation parameters between the total positive line and the connection node and between the total negative line and the connection node.

[0019] In the technical solution of the embodiment of the present application, the first supporting device is insulated from the auxiliary battery management device so that the detection of the first insulation detection circuit is not interfered with; the first insulation detection circuit starts working after being enabled, samples the voltage in different switching states, and calculates the equivalent insulation resistance between the total positive line and the connection node and between the total negative line and the connection node according to the voltage value.

[0020] In some embodiments, a second supporting device is further included, the second insulation detection circuit is supported by the second supporting device, and the ground terminal of the second insulation detection circuit is connected to the electrical platform together with the second supporting device.

[0021] In the technical solution of the embodiment of the present application, the second supporting device and the second insulation detection circuit are connected to the electrical platform, so that the potential of the second supporting device is not floating, and its insulation parameters can be detected by the second insulation detection circuit without being interfered by the electrical signal of the supporting member.

[0022] In some embodiments, the second supporting device is also provided with a battery management controller (Battery Management Controller, BMC), which is insulated and supported by the second supporting device. The battery management controller is connected to the second insulation detection circuit and is used to control the second insulation detection circuit to detect the insulation parameters between the total positive line and the electrical platform and between the total negative line and the electrical platform.

[0023] In the technical solution of the embodiment of the present application, the second supporting device and the battery management controller are connected to the electric platform together, so that the potential of the second supporting device is no longer floating, and the detection of the second insulation detection circuit is not interfered with; the second insulation detection circuit starts to work after being enabled, samples the voltage in different switching states, and calculates the equivalent insulation resistance between the total positive line and the electric platform and between the total negative line and the electric platform according to the voltage value.

[0024] In some embodiments, the energy storage system further includes a conductive path, wherein K support members among the plurality of support members are respectively connected to the conductive path through K branches, wherein K is a positive integer; and a protective component is disposed on the conductive path and / or the branch.

[0025] In the technical solution of the embodiment of the present application, since the battery assembly is insulated from the support member, the protection component 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 be protected by one or more protection components to avoid short circuit between the two support members with insulation failure, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0026] In some embodiments, the protection component includes a first protection component, and the first protection component is connected in series between K nodes formed by 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. When the insulation of more than one electrical box (support) fails, 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 protection component 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 last battery component is connected to the total negative circuit;

[0029] The first branch among 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 among 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.

[0030] 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 last support member and the total negative circuit respectively. In the event of insulation failure in the first support member and / or the last 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.

[0031] In some embodiments, the protection component includes a third protection component, and at least one of the K branches is connected in series with the third protection component.

[0032] 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), thereby reducing the possibility of high-voltage ignition and battery combustion and explosion, and making the wiring more flexible.

[0033] In some embodiments, the protection component includes a current limiting component, which is used to limit the current in the conductive path; or

[0034] The protection component includes an overcurrent protection component, which is used to perform overcurrent protection on the conductive path.

[0035] 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.

[0036] In some embodiments, there are N support members; and

[0037] When N is an even number, the N / 2th and / or N / 2+1th support member and the ground terminal of the first insulation detection circuit are connected to the connection node;

[0038] When N is an odd number, the (N+1) / 2th supporting member and the ground terminal of the first insulation detection circuit are connected to the connection node.

[0039] In the technical solution of the embodiment of the present application, the middlemost support member is connected to the ground terminal of the first insulation detection circuit, so that the potential voltage difference of each support member can be equalized, further improving the safety and reliability of the energy storage system.

[0040] In a second aspect, an embodiment of the present application provides a power supply device, which includes the energy storage system as described above.

[0041] 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

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0043] Figure 1 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0044] Figure 2 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0045] Figure 3 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0046] Figure 4 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0047] Figure 5 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0048] Figure 6 A circuit diagram of an energy storage system provided in some embodiments of the present application;

[0049] Figure 7 A circuit diagram of an insulation detection circuit provided in some embodiments of the present application;

[0050] Figure 8 A circuit diagram of an insulation detection circuit provided in some embodiments of the present application. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0054] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] 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).

[0057] With the widespread application of energy storage systems and transmission and distribution networks, solving the power supply problem of equipment has become a social issue. The DC unit of the energy storage system is usually placed in a power cabinet. The DC unit has multiple battery packs (or power boxes). Multiple battery packs are connected in series and parallel and then output to the energy storage converter (Power Conversion System, PCS).

[0058] Generally, each battery pack shell is either connected to the electric cabinet at the same potential, or is in a suspended or quasi-suspended state. The battery pack shell is connected to the electric cabinet at the same potential, that is, all battery pack shells in the electric cabinet are connected to the electric cabinet together. The problem is that if the insulation of more than one battery pack in the electric cabinet fails, it will immediately cause insulation failure and short circuit, low reliability and high risk of thermal runaway. The problem with the battery pack being in a suspended or quasi-suspended potential state is that the potential of the virtual floating shell is uncertain, and the electrical stress applied to the insulation may exceed its safety limit in some transient states, increasing the risk of insulation failure.

[0059] In order to solve the problem of reducing short-circuit current in the event of insulation failure of more than one electric box, a voltage equalizing chain is set between each battery pack, and a protection component is set on the voltage equalizing chain. The protection component is used to suppress the current between more than one electric box when there is current passing through, such as when the insulation of more than one electric box fails, 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 also 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.

[0060] After the voltage-equalizing chain is introduced, the insulation test uses the national standard test circuit, connects the test circuit to the total positive, total negative and midpoint of the battery system, and switches the test circuit to calculate the insulation resistance between the total positive and midpoint, and between the total negative and midpoint, and is required to detect insulation failures in all battery packs. However, the midpoint of the voltage-equalizing chain is not connected to the electrical platform, and the equivalent resistance from the total positive / total negative to the electrical platform cannot be detected.

[0061] According to some embodiments of the present application, referring to Figure 1 , Figure 1 A circuit diagram of an energy storage system provided by an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0062] 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-, and the battery module includes a plurality of battery assemblies 11 connected in series; the energy storage system also includes: a plurality of support members 12, a conductive path 13, a first insulation detection circuit 14, and a second insulation detection circuit 15.

[0063] 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, at least one protection assembly 130 is disposed between any two support members 12, and at least one node X1-Xk is formed between at least one protection assembly 130;

[0064] The first end of the first insulation detection circuit 14 is connected to the total positive line V+, the second end of the first insulation detection circuit 14 is connected to the total negative line V-, the ground end of the first insulation detection circuit 14 is used to connect to the connection node X1, and at least one node X1~Xk includes a connection node Xa.

[0065] The first end of the second insulation detection circuit 15 is connected to the total positive line V+, the second end of the second insulation detection circuit 15 is connected to the total negative line V−, and the ground end of the second insulation detection circuit 15 is connected to the electrical platform 10.

[0066] Among them, the energy storage system is configured to output electric 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 electric energy to the battery module through the total positive line V+ and the total negative line V-. The total positive line V+ and the total negative line V- are used to input or output electric power. 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 referred to as an electric 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, and the battery cold plate refers to a thin plate located under the battery assembly 11. Its main function is to conduct the heat inside the battery, keep the battery temperature stable, and thus improve the working efficiency of the battery. Each support member 12 can support one or more battery assemblies 11.

[0067] Among them, each protection component 130 is respectively connected between two spaced support members 12 (spaced by 0 or more support members 12), and multiple protection components 130 are connected in series to form a conductive path 13. In addition, the support member 12 is connected to the corresponding nodes X1~Xk of the conductive path 13 through a branch. The branch can be a conductive line, or it can include a conductive line and other protection components 130. It should be noted that the line or terminal of the protection component 130 connecting the support member 12 or the adjacent protection component 130 can be used as the node X1~Xk, or the connected support member 12 can also be used as the node X1~Xk. Exemplarily, on the conductive path 13, K-1 protection components 130 connected in series will form K nodes X1~Xk.

[0068] In the technical solution of the embodiment of the present application, the first insulation detection circuit 14 detects the insulation parameters between the total positive line V+ and the connection node Xa and between the total negative line V- and the connection node Xa. The second insulation detection circuit 15 detects the insulation parameters between the total positive line V+ and the electric platform 10 and between the total negative line V- and the electric platform 10. The resistance changes caused by insulation failure at various positions on the DC side of the energy storage system can be detected without interfering with each other.

[0069] Illustratively, since the battery assembly 11 and the support member 12 are insulated, the protection assembly 130 is connected in series between two adjacent support members 12. Therefore, in the event of insulation failure of one or more support members 12, a short circuit between the two support members 12 with insulation failure can be avoided based on the protection of one or more first protection assemblies 131, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0070] As an example, when the electrical platform 10 is grounded, the equipment connected to the electrical platform 10 (such as the electrical cabinet body of the battery) is generally considered to be grounded. In this example, the electrical platform 10 is given a ground potential through grounding, and the equipment connected to the electrical platform 10 is provided with a ground potential by the electrical platform 10. As another example, when the electrical platform 10 is connected to the total positive line V+ of the electrical cabinet, it can be considered that the electrical platform 10 is given the potential of the total positive line V+. If there is a device (such as the electrical cabinet body of the battery) connected to the electrical platform 10, it can be considered that the device is provided with the potential of the total positive line V+ by the electrical platform 10. As an example, the electrical platform 10 can be an object of equal potential so that the devices connected to the electrical platform 10 have equal potential. The electrical platform 10 can be, for example, a power ground or a conductor connected to the power ground, or it can be an installation platform for an energy storage system, etc.

[0071] According to some embodiments of the present application, referring to Figure 2 , Figure 2 A circuit diagram of an energy storage system provided by an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0072] The energy storage system also includes a voltage equalizing circuit 16 , which is connected between the total positive line V+ and the total negative line V−, and the midpoint of the voltage equalizing circuit 16 is connected to the electric platform 10 .

[0073] The voltage balancing circuit 16 may be a voltage balancing circuit on a current converter (PSC). In the technical solution of the embodiment of the present application, the voltage balancing circuit 16 is used to determine the potential of the electric platform 10 of the energy storage system.

[0074] According to some embodiments of this application, please continue to refer to Figure 2 The voltage balancing circuit includes a first voltage balancing component R11 and a second voltage balancing component R12, which are connected in series between the total positive line V+ and the total negative line V-, and the series node of the first voltage balancing component R11 and the second voltage balancing component R12 constitutes the midpoint of the voltage balancing circuit. In the technical solution of the embodiment of the present application, two voltage balancing components are used to determine the potential of the electric platform 10.

[0075] According to some embodiments of the present application, referring to Figure 3 , Figure 3 A circuit diagram of an energy storage system provided by an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0076] The energy storage system further includes a support device 20, in which the battery module, the support member 12 and the first insulation detection circuit 14 are arranged, and the support device 20 is used to insulate the support member 12 and the first insulation detection circuit 14, and the support device 20 is also connected to the electric platform 10. The support device 20 is, for example, a cabinet of a battery cabinet.

[0077] In the technical solution of the embodiment of the present application, a battery module is arranged in a supporting device 20, and the supporting member 12 and the first insulation detection circuit 14 are insulated from the supporting device 20, so that the insulation parameters between the total positive line V+ and the connection node Xa and between the total negative line V- and the connection node Xa can be detected by the first insulation detection circuit 14 without being interfered by the electrical signal of the supporting device 20; and the supporting device 20 is connected to the electric platform 10, so that the potential of the supporting device 20 is not floating, and its insulation parameters can be detected by the second insulation detection circuit 15 without being interfered by the electrical signal of the supporting member 12.

[0078] According to some embodiments of this application, please continue to refer to Figure 3 The supporting device 20 also includes a first supporting device 21 , and the first insulation detection circuit 14 is insulated and supported by the first supporting device 21 . The first supporting device 21 and the supporting device 20 are connected to the electrical platform 10 .

[0079] The first supporting device 21 is, for example, a main control box body or a supporting plate in an electric cabinet, and is used to set the first insulation detection circuit 14 .

[0080] In the technical solution of the embodiment of the present application, the first supporting device 21 is connected to the electric platform 10 so that the potential of the first supporting device 21 is not floating, and its insulation parameters can be detected by the second insulation detection circuit 15 without being interfered by the electrical signal of the supporting member 12.

[0081] According to some embodiments of this application, please continue to refer to Figure 3 The first supporting device 21 is also provided with an auxiliary battery management device 22. The auxiliary battery management device 22 is insulated and supported by the first supporting device 21. The auxiliary battery management device 22 is connected to the first insulation detection circuit 14. The auxiliary battery management device 22 is used to control the first insulation detection circuit 14 to detect the insulation parameters between the total positive line V+ and the connection node Xa and between the total negative line V- and the connection node Xa.

[0082] The auxiliary battery management device 22 is used to enable the first insulation detection circuit 14. Optionally, the auxiliary battery management device 22 is also used to manage and control the battery modules in the support device 20.

[0083] In the technical solution of the embodiment of the present application, the first supporting device 21 is insulated from the auxiliary battery management device 22 so that the detection of the first insulation detection circuit 14 is not interfered with; the first insulation detection circuit 14 starts working after being enabled, samples the voltage in different switching states, and calculates the equivalent insulation resistance between the total positive line V+ and the connection node Xa and between the total negative line V- and the connection node Xa according to the voltage value.

[0084] According to some embodiments of the present application, referring to Figure 4 , Figure 4 A circuit diagram of an energy storage system provided by an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0085] The energy storage system further includes a second supporting device 30 , the second insulation detection circuit 15 is supported by the second supporting device 30 , and the ground terminal of the second insulation detection circuit 15 and the second supporting device 30 are connected to the electrical platform 10 .

[0086] Exemplarily, the second supporting device 30 is, for example, a main control box body, which is used to set the second insulation detection circuit 15 .

[0087] In the technical solution of the embodiment of the present application, the second support device 30 and the second insulation detection circuit 15 are connected to the electric platform 10, so that the potential of the second support device 30 is not floating, and its insulation parameters can be detected by the second insulation detection circuit 15 without being interfered by the electrical signal of the support member 12.

[0088] According to some embodiments of this application, please continue to refer to Figure 4 The second supporting device 30 is also provided with a battery management controller 31, which is insulated and supported by the second supporting device 30. The battery management controller 31 is connected to the second insulation detection circuit 15. The battery management controller 31 is used to control the second insulation detection circuit 15 to detect the insulation parameters between the total positive line V+ and the electric platform 10 and between the total negative line V- and the electric platform 10.

[0089] Among them, the battery management controller 31 will communicate with the auxiliary battery management device 22 in each supporting device 20 to control each electric cabinet in the entire energy storage system.

[0090] In the technical solution of the embodiment of the present application, the second support device 30 and the battery management controller 31 are connected to the electric platform 10, so that the potential of the second support device 30 is no longer floating, and the detection of the second insulation detection circuit 15 is not interfered with; the second insulation detection circuit 15 starts to work after being enabled, samples the voltage in different switching states, and calculates the equivalent insulation resistance between the total positive line V+ and the electric platform 10 and between the total negative line V- and the electric platform 10 according to the voltage value.

[0091] According to some embodiments of the present application, please refer to Figures 1 to 4 , K support members 12 among the multiple support members 12 are respectively connected to the conductive path 13 through K branches, where K is a positive integer; a protection component 130 is arranged on the conductive path 13 and / or the branch.

[0092] In the technical solution of the embodiment of the present application, since the battery assembly 11 and the support member 12 are insulated, the protection assembly 130 is connected in series between two adjacent support members 12. Therefore, in the event of insulation failure of more than one support member 12, the two support members 12 with insulation failure can be protected by one or more protection assemblies 130 to avoid short circuit between the two support members 12 with insulation failure, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0093] According to some embodiments of the present application, please refer to Figures 1 to 4 The protection component 130 includes a first protection component 131 , and the first protection component 131 is connected in series between K nodes X1 to Xk formed by the K branches connected to the conductive path 13 .

[0094] In the technical solution of the embodiment of the present application, the first protection component 131 is connected in series between K nodes X1~Xk. In the event of insulation failure of one or more support members 12, the first protection component 131 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, thereby reducing the installation workload.

[0095] According to some embodiments of the present application, optionally, the first protection component 131 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 are connected in series between any two adjacent nodes among the K nodes X1~Xk.

[0096] It is understandable that the first sub-protection assembly can be any number and can be connected in series at any two nodes. When there are two support members 12, there is one first sub-protection assembly; when there are three or more support members 12, there can be one or more first sub-protection assemblies.

[0097] 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, thereby improving the flexibility of the configuration of the first current limiting protection component.

[0098] According to some embodiments of the present application, optionally, the first protection component 131 includes multiple first sub-protection components, the conductive path 13 includes K-1 sub-paths formed by K nodes X1~Xk, 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.

[0099] 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.

[0100] In the technical solution of the embodiment of the present application, the first sub-protection component can be set every 0 to multiple sub-passes, which improves the flexibility of the configuration of the first protection component.

[0101] According to some embodiments of the present application, optionally, the conductive path 13 includes K-1 sub-paths formed by K nodes X1~Xk, 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 to the K-1 sub-paths.

[0102] It can be understood that a first sub-protection component is disposed 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.

[0103] In the technical solution of the embodiment of the present application, a first sub-protection component is arranged between each adjacent support member 12. In the event of insulation failure of any support member 12, there is a first sub-protection component for short-circuit protection, which further reduces the possibility of causing high-voltage ignition and battery combustion and explosion.

[0104] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 , Figure 5 A circuit diagram of an energy storage system provided in an embodiment of the present application is shown. Figure 6 A circuit diagram of an energy storage system provided by an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0105] The protection assembly 130 further includes two second protection assemblies 132; the positive electrode of the first battery assembly 11 is connected to the total positive line V+, and the negative electrode of the last battery assembly 11 is connected to the total negative line V-;

[0106] The first branch among 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 among 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.

[0107] Exemplarily, there are N support members 12. In the battery module, the first battery assembly 11 and the last battery assembly 11 among the multiple battery assemblies 11 connected in series respectively refer to the first and last battery assemblies 11 in the series connection order, and the first battery assembly 11 is supported by the first support member 12, and the last battery assembly 11 is supported by the Nth support member 12.

[0108] Exemplarily, 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 .

[0109] For example, when K=N, the first support member 12 and the Nth support member 12 are respectively connected to the first end node X1 and the second end node Xk on the conductive path 13, 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 respectively connected to the total positive line V+ and the total negative line V- through the two second protection components 132. For example Figure 5 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 respectively connected to the total positive line V+ and the total negative line V-. Figure 6 In the example, 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-.

[0110] 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.

[0111] 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.

[0112] In some embodiments, the resistance of each first protection component 131 is a first preset resistance, the resistance of 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.

[0113] The first protection component 131 has a uniform resistance, and the resistance of the second protection component 132 is half of the first preset resistance, so that the pressure difference between adjacent support members 12 is balanced, and the electrical stress of the battery pack insulation is small during normal operation.

[0114] 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;

[0115] 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.

[0116] 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; wherein Vbus is the voltage difference between the total negative line V- and the total positive line V+.

[0117] 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, and insulation failure can be more easily discovered, compared with 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.

[0118] When m is greater than 0, the voltage drop of each first protection component 131 is m*Vbus / N. The voltage drop of each first protection component 131 is equal, which further improves the stability of the current limiting effect of the voltage equalizing chain and further reduces the possibility of high-voltage ignition and battery combustion and explosion.

[0119] In the technical solution of the embodiment of the present application, the pressure difference between each adjacent support member is equal. In the case of insulation failure of more than one support member 12, the stability of the current limiting function of one or more first protection components 131 is improved, and the possibility of causing high-voltage ignition and battery combustion and explosion is further reduced. Setting the resistance value of the second protection component 132 to be greater than or equal to the first preset resistance value is conducive to insulation detection, so that insulation failure can be detected more sensitively.

[0120] In the technical solution of the embodiment of the present application, some relationships between the resistance value of the second protection component 132 and the resistance value of the first protection component 131 are provided, which is beneficial to insulation detection and enables insulation failure to be detected more sensitively.

[0121] According to some embodiments of this application, please continue to refer to Figures 1 to 6 The protection component 130 includes a third protection component 133, and at least one of the K branches is connected in series with the third protection component 133.

[0122] The third protection component 133 may include a current limiting component and / or an overcurrent component. It is understandable that the K branch conductive paths 13 form K nodes X1 to Xk, and any number of first protection components 131 may be set between any nodes, and the details may refer to the above embodiments.

[0123] In the technical solution of the embodiment of the present application, the third protection component 133 is arranged 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.

[0124] 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 any at least one branch. It is understandable that there can be any number of third sub-protection components, which can be connected in series to any branch.

[0125] In the technical solution of the embodiment of the present application, the number of third sub-protection components to be configured can be reduced, saving costs.

[0126] 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.

[0127] It is understandable that a third sub-protection component is provided between each adjacent support member 12 , so when insulation failure occurs in any support member 12 , two third sub-protection components are provided to provide overcurrent protection against short-circuit current.

[0128] In the technical solution of the embodiment of the present application, a third sub-protection component is arranged 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 causing high-voltage ignition and battery combustion and explosion.

[0129] In some embodiments, the energy storage system further includes a capacitive component (not shown). One or more of the first protection component 131, the second protection component 132, and the third protection component 133 are connected in parallel with a capacitive component in a one-to-one correspondence. The capacitive component is, for example, a capacitor.

[0130] 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

[0131] Each protection component includes an overcurrent protection component, which is used to perform overcurrent protection on the current in the conductive path 13 .

[0132] It should be noted that the current limiting component may include a resistor component. In a specific implementation, the resistance of the current limiting component may be between kΩ and MΩ. The current limiting component reduces the short-circuit current, reduces the possibility of high-voltage ignition and battery combustion and explosion, and can maintain the normal operation of the energy storage system.

[0133] 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 with insulation failure, reduces the possibility of high-voltage ignition and battery combustion and explosion, and further improves safety and reliability.

[0134] 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.

[0135] In some embodiments, there are N support members; and when N is an even number, the N / 2 and / or N / 2+1th support member 12 and the ground terminal of the first insulation detection circuit 14 are connected to the connection node Xa; when N is an odd number, the (N+1) / 2th support member 12 and the ground terminal of the first insulation detection circuit 14 are connected to the connection node Xa.

[0136] The middlemost support member 12 is connected to the ground terminal of the first insulation detection circuit 14, so that the potential voltage difference of each support member 12 can be equalized, further improving the safety and reliability of the energy storage system.

[0137] It can be understood that when N is an odd number, the voltage between the connection node Xa and the total positive line V+ is a first voltage value, the voltage between the connection node Xa and the total negative line V- is a second voltage value, and the first voltage value and the second voltage value are equal. When N is an odd number, the voltage between the connection node Xa and the total positive line V+ is a first voltage value, the voltage between the connection node Xa and the total negative line V- is a second voltage value, and the first voltage value and the second voltage value are closest.

[0138] In some embodiments, the first insulation detection circuit 14 and the second insulation detection circuit 15 may be implemented using conventional insulation detection circuits.

[0139] See also Figure 7 , taking the first insulation detection circuit 14 as an example, it includes a first detection switch K1, a second detection switch K2, a first reference resistor Rm1 and a second reference resistor Rm2;

[0140] The first reference resistor Rm1 and the first detection switch K1 are connected in series between the total positive line V+ and the connection node Xa;

[0141] The second reference resistor Rm2 and the second detection switch K2 are connected in series between the total negative line V- and the connection node Xa.

[0142] Exemplarily, the first detection switch K1 and the second detection switch K2 are, for example, semiconductor transistors, relays, contactors or circuit breakers.

[0143] 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 access 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.

[0144] See also Figure 8 , taking the first insulation detection circuit 14 as an example, it also includes a third reference resistor Rm3, a fourth reference resistor Rm4, a fifth reference resistor Rm5 and a sixth reference resistor Rm6;

[0145] The third reference resistor Rm3 and the fourth reference resistor Rm4 are connected in series between the total positive line V+ and the connection node Xa;

[0146] The fifth reference resistor Rm5 and the sixth reference resistor Rm6 are connected in series between the total negative line V- and the connection node Xa.

[0147] In the technical solution of the embodiment of the present application, another detection topology for the insulation parameters of the energy storage system is provided, which uses a detection switch to control the access 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.

[0148] It can be understood that, in the second insulation detection circuit 15 , referring to the above-mentioned specific embodiment of the first insulation detection circuit 14 , the connection node Xa in the first insulation detection circuit 14 can be replaced by connecting to the electrical platform 10 .

[0149] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The insulation monitoring process is to sample the voltage value of the insulation detection circuit 14 twice in different detection switch states, and then use the sampled voltage and reference resistance to establish an equation to solve the insulation resistance. The ground terminal of the first insulation detection circuit 14 is connected to the connection node Xa. It is assumed that an equivalent first insulation resistance Rx is formed between the total positive line V+ and the connection node Xa, and an equivalent second insulation resistance Ry is formed between the total negative line V- and the connection node Xa.

[0150] Example 1, please refer to Figure 7 , when the first detection switch K1 and the second detection switch K2 are disconnected, the first voltage V1 between the total positive line V+ and the connection node Xa, and the second voltage V2 between the total negative line V- and the connection node Xa are detected; the first detection switch K1 is closed (in other examples, the second detection switch K2 may be closed), the third voltage V1' between the total positive line V+ and the connection node Xa, and the fourth voltage V2' between the total negative line V- and the connection node Xa are detected, and the resistance values ​​of the two insulation resistors are derived:

[0151] (1)

[0152] ) (2)

[0153] Example 2, please refer to Figure 8 , when the first detection switch K1 is closed and the second detection switch K2 is opened, the fifth voltage V3 across the fourth reference resistor Rm4 and the sixth voltage V4 across the fifth reference resistor Rm5 are detected, and according to the loop current equalization principle, the following is obtained:

[0154] (3)

[0155] When the first detection switch K1 is disconnected and the second detection switch K2 is closed, the seventh voltage V3' across the fourth reference resistor Rm4 and the eighth voltage V4' across the fifth reference resistor Rm5 are detected, and according to the loop current equalization principle, the following is obtained:

[0156] (4)

[0157] The resistance values ​​of the two insulation resistors are derived according to formulas (3) and (4).

[0158] The above insulation monitoring process and the calculation of the two insulation resistances are only taken as examples. During the implementation of the solution, the insulation monitoring process and the specific method of calculating the insulation resistance are not limited to this. The second insulation detection circuit 15 detects the insulation parameters between the total positive line V+ and the electric platform 10 and between the total negative line V- and the electric platform 10. The above examples can be referred to and will not be repeated.

[0159] In a second aspect, an embodiment of the present application provides a power supply device, which includes the energy storage system as described above.

[0160] According to some embodiments of the present application, the present application also provides a power supply device, comprising an energy storage system of any of the above solutions.

[0161] In a specific implementation, the power supply device may include an energy storage station, and the energy storage system stores electric energy for the energy storage station and releases the electric energy when the power grid is short of energy.

[0162] 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.

[0163] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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: It includes 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 battery module includes a plurality of battery assemblies connected in series; The energy storage system further comprises: A plurality of support members, each of the battery assemblies is supported by each of the support members in a one-to-one correspondence, each of the battery assemblies is insulated from each of the support members, at least one protection assembly is arranged between any two of the support members, and at least one node is formed between the at least one protection assembly; a first insulation detection circuit, wherein a first end of the first insulation detection circuit is connected to the total positive line, a second end of the first insulation detection circuit is connected to the total negative line, a ground end of the first insulation detection circuit is connected to a connection node, and the at least one node includes the connection node; A second insulation detection circuit, wherein the first end of the second insulation detection circuit is connected to the total positive line, the second end of the second insulation detection circuit is connected to the total negative line, and the ground end of the second insulation detection circuit is connected to the electrical platform.

2. The energy storage system according to claim 1, characterized in that: It also includes a voltage balancing circuit, which is connected between the total positive line and the total negative line, and the midpoint of the voltage balancing circuit is connected to the electric platform.

3. The energy storage system according to claim 2, characterized in that: The voltage balancing circuit includes a first voltage balancing component and a second voltage balancing component, 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 constitutes the midpoint of the voltage balancing circuit.

4. The energy storage system according to claim 1, characterized in that: It also includes a supporting device, in which the battery module, the supporting member and the first insulation detection circuit are arranged, and the supporting device is used to insulately support the supporting member and the first insulation detection circuit, and the supporting device is also connected to the electrical platform.

5. The energy storage system according to claim 4, characterized in that: The supporting device further comprises a first supporting means, the first insulation detection circuit is insulated and supported by the first supporting means, and the first supporting means and the supporting device are connected to the electrical platform.

6. The energy storage system according to claim 5, characterized in that: The first supporting device is also provided with an auxiliary battery management device, which is insulated and supported by the first supporting device. The auxiliary battery management device is connected to the first insulation detection circuit and is used to control the first insulation detection circuit to detect the insulation parameters between the total positive line and the connection node and between the total negative line and the connection node.

7. The energy storage system according to claim 1, characterized in that: It also includes a second supporting device, the second insulation detection circuit is supported by the second supporting device, and the ground terminal of the second insulation detection circuit and the second supporting device are connected to the electrical platform.

8. The energy storage system according to claim 7, characterized in that: The second supporting device is also provided with a battery management controller, which is insulated and supported by the second supporting device. The battery management controller is connected to the second insulation detection circuit and is used to control the second insulation detection circuit to detect the insulation parameters between the total positive line and the electrical platform and between the total negative line and the electrical platform.

9. The energy storage system according to claim 1, characterized in that: The energy storage system further includes a conductive path, wherein K support members among the plurality of support members are respectively connected to the conductive path through K branches, wherein K is a positive integer; and the protective component is disposed on the conductive path and / or the branch.

10. The energy storage system according to claim 9, 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.

11. The energy storage system according to claim 9 or 10, 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 circuit, and the negative electrode of the last battery assembly is connected to the total negative circuit; The first branch among 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 among 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.

12. The energy storage system according to claim 9 or 10, characterized in that: The protection component includes a third protection component, and at least one of the K branches is connected in series with the third protection component.

13. The energy storage system according to claim 9, 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.

14. The energy storage system according to claim 1, characterized in that: The number of the supporting members is N; and When N is an even number, the N / 2th and / or N / 2+1th support members and the ground terminal of the first insulation detection circuit are connected to the connection node in common; When N is an odd number, the (N+1) / 2th support member and the ground terminal of the first insulation detection circuit are connected to the connection node.

15. A power supply device, characterized in that: The power supply device comprises the energy storage system according to any one of claims 1 to 14.

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