Energy storage system and power supply device

Abstract

An energy storage system and a power supply device, relating to the technical field of power supplies. In the energy storage system, a grounding end of a first insulation test circuit (14) is connected to a connection node (Xa) of a protection assembly (130), for sampling a voltage and measuring insulation parameters between a positive bus (V+) and the connection node (Xa) and between a negative bus (V-) and the connection node (Xa); and a grounding end of a second insulation test circuit (15) is connected to an electrical platform (10), for sampling a voltage and measuring insulation parameters between the positive bus (V+) and the electronic platform (10) and between the negative bus (V-) and the electrical platform (10). In this way, resistance changes caused by an insulation failure at various positions on the direct-current side of the energy storage system can be detected without mutual interference.

Description

Energy storage systems and power supply devices

[0001] This application claims priority to Chinese Patent Application No. 202422472513.4, filed on October 14, 2024, with the State Intellectual Property Office of the People's Republic of China, entitled "Energy Storage System and Power Supply Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of power supply technology, and in particular relates to an energy storage system and power supply device. Background Technology

[0003] The relevant energy storage system includes multiple battery packs (or enclosures) connected in series and / or parallel. Short-circuit protection methods include installing fuses at the positive or negative terminal of the energy storage system, or installing fuses 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 and negative terminals of the energy storage system. However, when a double-point insulation failure occurs across enclosures (i.e., insulation failure occurs in two separate enclosures), the voltage difference is high, and the short-circuit current is extremely large, easily leading to serious safety problems such as high-voltage arcing and battery combustion and explosion. To address this deficiency, current methods use equipotential bonding chains to fix the potential of each battery pack casing, solving the problem of battery short circuits caused by insulation failures in multiple battery packs when equipotentially connected.

[0004] However, after configuring the equalizing chain, the insulation monitoring module (IMM) is connected to the main positive, main negative, and midpoint of the equalizing chain of the battery system. At this time, the midpoint of the equalizing chain is not conductive to the electrical platform, and only the equivalent resistance from the main positive / main negative chain to the midpoint of the equalizing chain can be detected. The equivalent resistance from the main positive / main negative chain to the electrical platform cannot be detected, meaning the detection range does not include all locations on the DC side.

[0005] Application content

[0006] In view of the above problems, this application provides an energy storage system and power supply device, which aims to solve the problem of insufficient IMM detection range after configuring the voltage equalization chain in the relevant energy storage system.

[0007] In a first aspect, embodiments of this application provide an energy storage system, including a main positive line, a main negative line, and a battery module connected between the main positive line and the main negative line, wherein the battery module includes multiple battery components connected in series; the energy storage system further includes:

[0008] Multiple support components are provided, and each battery module is supported by each support component in a corresponding manner. Each battery module is insulated from each support component. At least one protective component is provided between any two support components, and at least one node is formed between the at least one protective component.

[0009] The first insulation detection circuit has a first terminal connected to the main positive line, a second terminal connected to the main negative line, and a ground terminal connected to a connection node, wherein at least one node includes a connection node.

[0010] The second insulation detection circuit has its first terminal connected to the main positive line, its second terminal connected to the main negative line, and its ground terminal connected to the power platform.

[0011] In the technical solution of this application embodiment, because the battery assembly and the support members are insulated, and the protection component is connected in series between two adjacent support members, in the event of insulation failure of one or more support members, the two support members with insulation failure are protected by one or more protection components, preventing short circuits between the two support members with insulation failure and reducing the possibility of high-voltage arcing and battery combustion and explosion. Furthermore, the ground terminal of the first insulation detection circuit is connected to the connection node of the protection component, allowing voltage sampling and detection of insulation parameters between the total positive line and the connection node, and between the total negative line and the connection node. The ground terminal of the second insulation detection circuit is connected to the power platform, allowing voltage sampling and detection of insulation parameters between the total positive line and the power platform, and between the total negative line and the power platform. Thus, resistance changes caused by insulation failure at various locations on the DC side of the energy storage system can be detected without mutual interference.

[0012] In some embodiments, a voltage equalization circuit is also included, which is connected between the main positive line and the main negative line, and the midpoint of the voltage equalization circuit is connected to the electrical platform.

[0013] In the technical solution of this application embodiment, a voltage equalization circuit is used to determine the electrical plateau potential of the energy storage system.

[0014] In some embodiments, the voltage equalization circuit includes a first voltage equalization component and a second voltage equalization component, which are connected in series between the main positive line and the main negative line. The series node of the first voltage equalization component and the second voltage equalization component constitutes the midpoint of the voltage equalization circuit.

[0015] In the technical solution of this application embodiment, two voltage equalization components are used to determine the electric plateau potential.

[0016] In some embodiments, a support device is also included, in which the battery module, the support member, and the first insulation detection circuit are disposed. The support device is used to provide insulation support for the support member and the first insulation detection circuit. The support device is also connected to the electric platform.

[0017] In the technical solution of this application embodiment, a battery module is disposed within a supporting device, and the supporting component and the first insulation detection circuit are insulated from the supporting device, so that the insulation parameters between the main positive line and the connection node and between the main negative line and the connection node can be detected by the first insulation detection circuit without being interfered with 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 with by the electrical signal of the supporting component.

[0018] In some embodiments, the support device further includes a first support device, the first insulation detection circuit is insulated and supported by the first support device, and the first support device and the support device are connected to the same electrical platform.

[0019] In the technical solution of this application embodiment, similarly, the first support device is connected to the electric platform, so that the potential of the first support device is not illusory, and its insulation parameters can be detected by the second insulation detection circuit without being interfered with by the electrical signal of the support member.

[0020] In some embodiments, the first support device is further provided with an auxiliary battery management unit (SBMU), which is insulated and supported by the first support device. The auxiliary battery management unit is connected to a 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.

[0021] In the technical solution of this application embodiment, the first support device and the auxiliary battery management device are insulated from each other, so that the detection of the first insulation detection circuit is not interfered with; after the first insulation detection circuit is enabled, it starts to work, 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 based on the voltage value.

[0022] In some embodiments, a second support device is also included, the second insulation detection circuit is supported by the second support device, and the grounding terminal of the second insulation detection circuit and the second support device are connected to the same electrical platform.

[0023] In the technical solution of this application embodiment, the second support device, the second insulation detection circuit and the electric platform are connected, so that the potential of the second support device is not floating, and its insulation parameters can be detected by the second insulation detection circuit without being interfered with by the electrical signal of the support.

[0024] In some embodiments, the second support device is further provided with a battery management controller (BMC), which is insulated and supported by the second support device. The battery management controller is connected to a second insulation detection circuit and is used to control the second insulation detection circuit to detect the insulation parameters between the main positive line and the power platform and between the main negative line and the power platform.

[0025] In the technical solution of this application embodiment, the second support device and the battery management controller are connected to the same electrical platform, so that the potential of the second support 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 electrical platform and between the total negative line and the electrical platform based on the voltage value.

[0026] In some embodiments, the energy storage system further includes a conductive path, wherein K of the plurality of supports are connected to the conductive path through K branches, where K is a positive integer; and protective components are provided on the conductive path and / or branches.

[0027] In the technical solution of this application embodiment, since the battery assembly is insulated from the support member, and the protection component is connected in series between two adjacent support members, in the event of insulation failure of one or more support members, the two support members with insulation failure are protected by one or more protection components, which avoids short circuit between the two support members with insulation failure and reduces the possibility of high voltage sparking and battery combustion and explosion.

[0028] In some embodiments, 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.

[0029] In the technical solution of this application embodiment, the first protection component is connected in series between K nodes. In the event of insulation failure of more than one electrical box (support member), the first protection component can suppress short circuit current, reduce the possibility of high voltage arcing and battery combustion and explosion, and at the same time, the number of connecting wires is small, reducing the workload of installation.

[0030] In some embodiments, the protection component further includes two second protection components; the positive terminal of the first battery component is connected to the main positive line, and the negative terminal of the last battery component is connected to the main negative line.

[0031] The first branch of the K branches is connected to one of the two second protection components between the first node formed by the conductive path and the main positive line, and the Kth branch of the K branches is connected to the other of the two second protection components between the Kth node formed by the conductive path and the main negative line.

[0032] In the technical solution of this application embodiment, a second protection component is connected in series between the first support member and the main positive line and between the last support member and the main negative line. In the event of insulation failure of the first support member and / or the last support member, a second protection component is provided to suppress the short circuit current, further reducing the possibility of high voltage arcing and battery combustion and explosion.

[0033] 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.

[0034] In the technical solution of this application embodiment, the third protection component is set on K branches. In the event of insulation failure of more than one electrical box (support member), it is used for short circuit protection, which reduces the possibility of high voltage arcing and battery combustion and explosion, while making the wiring more flexible.

[0035] In some embodiments, the protection component includes a current-limiting component for limiting the current in the conductive path; or

[0036] The protection components include overcurrent protection components, which are used to protect the conductive path from overcurrent.

[0037] In the technical solutions of this application embodiment, the protection component can be a current limiting component or an overcurrent protection component, which improves the flexibility of the protection component configuration.

[0038] In some embodiments, there are N supports; and

[0039] When N is even, the N / 2 and / or N / 2+1th support member is connected to the connection node along with the grounding terminal of the first insulation detection circuit;

[0040] When N is odd, the (N+1) / 2th support member and the grounding terminal of the first insulation detection circuit are connected to the connection node.

[0041] In the technical solution of this application embodiment, the middle support member is connected to the grounding terminal of the first insulation detection circuit, so that the potential difference of each support member is equal, which further improves the safety and reliability of the energy storage system.

[0042] Secondly, embodiments of this application provide a power supply device, which includes the energy storage system described above.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0046] Figure 2 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0047] Figure 3 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0048] Figure 4 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0049] Figure 5 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0050] Figure 6 is a circuit diagram of an energy storage system provided in some embodiments of this application;

[0051] Figure 7 is a circuit diagram of an insulation detection circuit provided in some embodiments of this application;

[0052] Figure 8 is a circuit diagram of an insulation detection circuit provided in some embodiments of this application. Detailed Implementation

[0053] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0059] With the widespread application of energy storage systems in power transmission and distribution networks, solving the power supply problem for equipment has become a current social issue. The DC unit of an energy storage system is usually located in an electrical cabinet. The DC unit has multiple battery packs (or electrical boxes), which are connected in series and parallel to output to the power conversion system (PCS).

[0060] Generally, the outer casing of each battery pack is either equipotentially connected to the electrical cabinet or in a floating or quasi-floating state. Equipotential connection means all battery pack casings within the cabinet are connected together. The problem is that if the insulation of more than one battery pack in 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. On the other hand, a battery pack in a floating or quasi-floating state presents the problem that the potential of the floating casing is uncertain, which may cause electrical stress on the insulation to exceed its safety limits under certain transient conditions, increasing the risk of insulation failure.

[0061] To address the issue of reducing short-circuit current in the event of insulation failure in multiple battery packs, an equalizing chain is installed between the battery packs. This chain includes protective components that suppress current flow between the multiple battery packs in the event of insulation failure, thereby improving the safety and reliability of the energy storage system. Furthermore, the equalizing chain ensures a stable potential for all battery pack casings, resolving the issue of fluctuating casing potentials. Additionally, an insulation detection circuit can be incorporated into the energy storage system to monitor its insulation parameters, reducing the likelihood of prolonged operation with insulation failures in the battery modules.

[0062] After the voltage equalization chain was introduced, insulation testing was performed using a national standard method circuit. The circuit was connected to the main positive, main negative, and midpoint of the voltage equalization chain of the battery system. Switching the circuit's switches calculated the insulation resistance between the main positive and midpoints, and between the main negative and midpoints, with the requirement to detect insulation failures occurring at all locations within the battery pack. However, the midpoint of the voltage equalization chain was not conductive to the electrical platform, and the equivalent resistance from the main positive / main negative chain to the electrical platform could not be detected.

[0063] According to some embodiments of this application, referring to FIG1, FIG1 shows a circuit diagram of an energy storage system provided in an embodiment of this application. For ease of explanation, only the parts related to this embodiment are shown, which are described in detail below:

[0064] The energy storage system includes a main positive line V+, a main negative line V-, and a battery module connected between the main positive line V+ and the main negative line V-. The battery module includes multiple battery components 11 connected in series. The energy storage system also includes multiple support components 12, a conductive path 13, a first insulation detection circuit 14, and a second insulation detection circuit 15.

[0065] Each battery component 11 is supported by each support member 12 in a corresponding manner. Each battery component 11 is insulated from each support member 12. At least one protective component 130 is provided between any two support members 12. At least one node X1 to Xk is formed between the at least one protective component 130.

[0066] The first terminal of the first insulation detection circuit 14 is connected to the main positive line V+, the second terminal of the first insulation detection circuit 14 is connected to the main negative line V-, and the ground terminal of the first insulation detection circuit 14 is used to connect to the connection node X1. At least one node X1 to Xk includes the connection node Xa.

[0067] The first terminal of the second insulation detection circuit 15 is connected to the main positive line V+, the second terminal of the second insulation detection circuit 15 is connected to the main negative line V-, and the ground terminal of the second insulation detection circuit 15 is connected to the power platform 10.

[0068] The energy storage system is configured to output electrical energy from the battery module via the main positive line V+ and the main negative line V-, and / or to input electrical energy into the battery module via the main positive line V+ and the main negative line V-. The main positive line V+ and the main negative line V- are used for inputting or outputting power. The battery assembly 11 includes one or more cells connected in parallel and / or in series. The support member 12 includes a housing (also referred to as 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 is a thin sheet located below the battery assembly 11. Its main function is to conduct heat out of the battery, maintain the battery temperature stability, and thus improve the battery's operating efficiency. Each support member 12 can support one or more battery assemblies 11.

[0069] Each protection component 130 is connected to two spaced support members 12 (spaced apart by zero or more support members 12), and multiple protection components 130 are connected in series to form a conductive path 13. Additionally, the support members 12 are connected to corresponding nodes X1 to Xk of the conductive path 13 via branches. These branches can be conductive lines or include conductive lines and other protection components 130. It should be noted that the lines or terminals connecting the protection components 130 to the support members 12 or adjacent protection components 130 can serve as nodes X1 to Xk, or the connected support members 12 can also serve as nodes X1 to Xk. For example, K-1 protection components 130 connected in series on the conductive path 13 will form K nodes X1 to Xk.

[0070] In the technical solution of this application embodiment, the first insulation detection circuit 14 detects the insulation parameters between the main positive line V+ and the connecting node Xa, and between the main negative line V- and the connecting node Xa. The second insulation detection circuit 15 detects the insulation parameters between the main positive line V+ and the power platform 10, and between the main negative line V- and the power platform 10. It can detect resistance changes caused by insulation failure at various locations on the DC side of the energy storage system without mutual interference.

[0071] For example, since the battery assembly 11 is insulated from the support member 12, the protection component 130 is connected in series between two adjacent support members 12. In the event of insulation failure of more than one support member 12, the two support members 12 with insulation failure are protected by one or more first protection components 131, which prevents short circuit between the two support members 12 with insulation failure and reduces the possibility of high voltage sparking and battery combustion and explosion.

[0072] As an example, when the power platform 10 is grounded, devices connected to the power platform 10 (such as the battery cabinet) are generally also considered to be grounded. In this example, the power platform 10 is given a ground potential through grounding, and the devices connected to the power platform 10 are provided with a ground potential by the power platform 10. As another example, when the power platform 10 is connected to the main positive line V+ of the cabinet, the power platform 10 can be considered to be given the potential of the main positive line V+. If devices (such as the battery cabinet) are connected to the power platform 10, the devices can be considered to be provided with the potential of the main positive line V+ by the power platform 10. As an example, the power platform 10 can be an equipotential object so that devices connected to the power platform 10 are at the same potential. The power platform 10 can be, for example, a power ground or a conductor connected to a power ground, or it can be an installation platform for an energy storage system, etc.

[0073] According to some embodiments of this application, referring to FIG2, FIG2 shows a circuit diagram of an energy storage system provided in an embodiment of this application. For ease of explanation, only the parts related to this embodiment are shown, which are described in detail below:

[0074] The energy storage system also includes a voltage equalization circuit 16, which is connected between the main positive line V+ and the main negative line V-, and the midpoint of the voltage equalization circuit 16 is connected to the power platform 10.

[0075] The voltage equalization circuit 16 can be a voltage equalization circuit on a power supply converter (PSC). In the technical solution of this application embodiment, the voltage equalization circuit 16 is used to determine the potential of the electrical platform 10 of the energy storage system.

[0076] According to some embodiments of this application, please continue to refer to Figure 2. The voltage equalization circuit includes a first voltage equalization component R11 and a second voltage equalization component R12. The first voltage equalization component R11 and the second voltage equalization component R12 are connected in series between the total positive line V+ and the total negative line V-. The series node of the first voltage equalization component R11 and the second voltage equalization component R12 constitutes the midpoint of the voltage equalization circuit. In the technical solution of the embodiments of this application, two voltage equalization components are used to determine the potential of the voltage platform 10.

[0077] According to some embodiments of this application, referring to FIG3, FIG3 shows a circuit diagram of an energy storage system provided in an embodiment of this application. For ease of explanation, only the parts related to this embodiment are shown, which are described in detail below:

[0078] The energy storage system also includes a support device 20. The battery module, support member 12, and first insulation detection circuit 14 are disposed within the support device 20. The support device 20 is used to provide insulation support for the support member 12 and the first insulation detection circuit 14. The support device 20 is also connected to the power platform 10. The support device 20 is, for example, the cabinet of a battery cabinet.

[0079] In the technical solution of this application embodiment, a battery module is disposed within a support device 20, and the support member 12 and the first insulation detection circuit 14 are insulated from the support device 20, so that the insulation parameters between the total positive line V+ and the connecting node Xa and between the total negative line V- and the connecting node Xa can be detected by the first insulation detection circuit 14 without being interfered with by the electrical signal of the support device 20; and the support device 20 is connected to the electrical platform 10, so that the potential of the support device 20 is not floating, and its insulation parameters can be detected by the second insulation detection circuit 15 without being interfered with by the electrical signal of the support member 12.

[0080] According to some embodiments of this application, please continue to refer to FIG3. The support device 20 further includes a first support device 21. The first insulation detection circuit 14 is insulated and supported by the first support device 21. The first support device 21 and the support device 20 are connected to the power platform 10.

[0081] The first support device 21 is, for example, the main control box or support plate in the electrical cabinet, used to install the first insulation detection circuit 14.

[0082] In the technical solution of this application embodiment, the first support device 21 is connected to the electric platform 10, so that the potential of the first support device 21 is not floating, and its insulation parameters can be detected by the second insulation detection circuit 15 without being interfered with by the electrical signal of the support member 12.

[0083] According to some embodiments of this application, please continue to refer to FIG3. The first support device 21 is further provided with an auxiliary battery management device 22. The auxiliary battery management device 22 is insulated and supported by the first support 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.

[0084] The auxiliary battery management device 22 is used to enable the first insulation detection circuit 14. In some embodiments, the auxiliary battery management device 22 is also used to manage the battery module within the support device 20.

[0085] In the technical solution of this application embodiment, the first support device 21 and the auxiliary battery management device 22 are insulated from each other, so that the detection of the first insulation detection circuit 14 is not interfered with; the first insulation detection circuit 14 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 connection node Xa and between the total negative line V- and the connection node Xa based on the voltage value.

[0086] According to some embodiments of this application, referring to FIG4, FIG4 shows a circuit diagram of an energy storage system provided in an embodiment of this application. For ease of explanation, only the parts related to this embodiment are shown, which are described in detail below:

[0087] The energy storage system also includes a second support device 30, a second insulation detection circuit 15 supported by the second support device 30, and the grounding terminal of the second insulation detection circuit 15 and the second support device 30 are connected to the power platform 10.

[0088] For example, the second support device 30 is, for instance, the main control box housing, for housing the second insulation detection circuit 15.

[0089] In the technical solution of this application embodiment, 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 with by the electrical signal of the support member 12.

[0090] According to some embodiments of this application, please continue to refer to FIG4. The second support device 30 is further provided with a battery management controller 31. The battery management controller 31 is insulated and supported by the second support 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 power platform 10 and between the total negative line V- and the power platform 10.

[0091] Among them, the battery management controller 31 will communicate with the auxiliary battery management device 22 in each support device 20 to control each cabinet in the entire energy storage system.

[0092] In the technical solution of this application embodiment, the second support device 30 and the battery management controller 31 are connected to the power 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. After the second insulation detection circuit 15 is enabled, it starts to work, samples the voltage in different switching states, and calculates the equivalent insulation resistance between the total positive line V+ and the power platform 10 and between the total negative line V- and the power platform 10 based on the voltage value.

[0093] According to some embodiments of this application, please refer to Figures 1 to 4. K of the multiple support members 12 are connected to the conductive path 13 through K branches, where K are all positive integers; protective components 130 are provided on the conductive path 13 and / or branches.

[0094] In the technical solution of this application embodiment, since the battery assembly 11 is insulated from the support member 12, and the protection component 130 is connected in series between two adjacent support members 12, in the event of insulation failure of one or more support members 12, the two support members 12 with insulation failure are protected by one or more protection components 130, which avoids short circuit between the two support members 12 with insulation failure and reduces the possibility of high voltage sparking and battery combustion and explosion.

[0095] According to some embodiments of this application, please refer to Figures 1 to 4. The protection component 130 includes a first protection component 131. K branches are connected in series between the K nodes X1 to Xk formed by the conductive path 13.

[0096] In the technical solution of this application embodiment, the first protection component 131 is connected in series between K nodes X1 to Xk. In the event of insulation failure of more than one support member 12, the first protection component 131 can suppress short circuit current, reduce the possibility of high voltage arcing and battery combustion and explosion, and at the same time, the number of connecting wires is small, reducing the workload of installation.

[0097] According to some embodiments of this application, the first protection component 131 includes at least one first sub-protection component, the number of the at least one first sub-protection component is ≤K-1, and at least one or zero of the first sub-protection components are connected in series between any two adjacent nodes among the K nodes X1 to Xk.

[0098] It is understandable that the number of first sub-protection components can be arbitrary and can be connected in series on any two nodes. When there are two support members 12, there is one first sub-protection component; when there are three or more support members 12, there can be one or more first sub-protection components.

[0099] In the technical solution of this application embodiment, a first sub-protection component can be set every 0 or more nodes X for current limiting, which improves the flexibility of the configuration of the first current limiting protection component.

[0100] According to some embodiments of this application, the first protection component 131 includes a plurality of first sub-protection components, and the conductive path 13 includes K-1 sub-paths formed by K nodes X1 to Xk. A target sub-path is set every m sub-paths, and the target sub-paths are connected in series with the first sub-protection components, where m is a natural number.

[0101] Understandably, 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. The evenly distributed first sub-protection components further reduce the possibility of high-voltage arcing and battery combustion and explosion.

[0102] In the technical solution of this application embodiment, a first sub-protection component can be set every 0 to multiple sub-paths, which improves the flexibility of the configuration of the first protection component.

[0103] According to some embodiments of this application, the conductive path 13 includes K-1 sub-paths formed by K nodes X1 to Xk, and the first protection component 131 includes K-1 first sub-protection components, which are respectively connected in series on the K-1 sub-paths.

[0104] It is understandable that a first sub-protection component is provided between each adjacent support member 12. Therefore, in the event of insulation failure of any support member 12, one or more sub-protection components will affect the short-circuit current.

[0105] In the technical solution of this application embodiment, a first sub-protection component is provided between each adjacent support member 12. In the event of insulation failure of any support member 12, a first sub-protection component is provided for short circuit protection, which further reduces the possibility of high voltage sparking and battery combustion and explosion.

[0106] According to some embodiments of this application, please refer to Figures 5 and 6. Figure 5 shows a circuit diagram of an energy storage system provided in an embodiment of this application, and Figure 6 shows a circuit diagram of an energy storage system provided in an embodiment of this application. For ease of explanation, only the parts related to this embodiment are shown, and the details are as follows:

[0107] The protection component 130 also includes two second protection components 132; the positive terminal of the first battery component 11 is connected to the total positive line V+, and the negative terminal of the last battery component 11 is connected to the total negative line V-.

[0108] The first branch of the K branches is connected between the first terminal node X1 and the main positive line V+, connecting one of the two second protection components 132; and the Kth branch of the K branches is connected between the second terminal node Xk and the main negative line V-, connecting the other of the two second protection components 132; the second protection component 132 is used to affect the current in the conductive path.

[0109] For example, there are N support members 12. In the battery module, the first battery component 11 and the last battery component 11 in the series of battery components 11 refer to the first and last battery components 11 in the series sequence, respectively. The first battery component 11 is supported by the first support member 12, and the last battery component 11 is supported by the Nth support member 12.

[0110] 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 an equalizing chain to equalize the voltage between each pair of adjacent supports 12.

[0111] 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 is at the same potential as the first end node X1, and the Nth support member 12 is at the same potential as the second end node Xk. Then, 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 two second protection components 132 in at least two ways. For example, in the example of Figure 5, 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 then respectively connected to the total positive line V+ and the total negative line V-. In the example of Figure 6, two second protection components 132 are respectively set on the first support 12 and the Nth support 12, and the first support 12 and the Nth support 12 are respectively connected to the total positive line V+ and the total negative line V-.

[0112] In the technical solution of this application embodiment, a second protection component 132 is connected in series between the first support member 12 and the main positive line V+ and between the Nth support member 12 and the main negative line V-. In the event of insulation failure of the first support member 12 and / or the Nth support member 12, a second protection component 132 is provided to suppress the short circuit current, further reducing the possibility of high voltage arcing and battery combustion and explosion.

[0113] In the technical solution of this application embodiment, a second protection component 132 is connected in series between the first support member 12 and the main positive line V+ and between the Nth support member 12 and the main negative line V-. In the event of insulation failure of the first support member 12 and / or the Nth support member 12, a second protection component 132 is provided to suppress the short circuit current, further reducing the possibility of high voltage arcing and battery combustion and explosion.

[0114] In some embodiments, the resistance value of each first protection component 131 is a first preset resistance value, the resistance values ​​of the two second protection components 132 are equal and greater than or equal to the first preset resistance value, or the resistance value of the second protection component 132 is half of the first preset resistance value.

[0115] The first protection component 131 has equal resistance, and the second protection component 132 has half the resistance of the first preset resistance, which realizes the pressure difference balance between each adjacent support component 12, and the electrical stress of the battery pack insulation is small during normal operation.

[0116] In some embodiments, when m is 0, the resistance value of each first protection component 131 is a first preset resistance value R; when m is greater than 0, the resistance value of each first protection component 131 is a first configured resistance value mR.

[0117] For example, 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.

[0118] 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 main positive line V+ is 2Vbus / N; the voltage difference between the nth support member 12 and the main negative line V- is 2Vbus / N; where Vbus is the voltage difference between the main negative line V- and the main positive line V+.

[0119] Setting the resistance of the second protection component 132 to be greater than that of the first protection component 131, compared to setting the resistance of the second protection component 132 to be less than or equal to that of the first protection component 131, can improve the sensitivity of insulation failure detection, making insulation failure easier to detect.

[0120] When m is greater than 0, the voltage drop across each of the first protection components 131 is m*Vbus / N. The equal voltage drop across each of the first protection components 131 further improves the stability of the current-limiting effect of the voltage equalization chain, and further reduces the possibility of high-voltage arcing and battery combustion / explosion.

[0121] In the technical solution of this application embodiment, the pressure difference between each adjacent support member is equal. In the event of insulation failure in one or more support members 12, the stability of the current limiting function of one or more first protection components 131 is improved, further reducing the possibility of high-voltage arcing and battery combustion and explosion. Setting the resistance value of the second protection component 132 to be greater than or equal to the first preset resistance value is beneficial for insulation detection, making insulation failures more sensitive to be detected.

[0122] In the technical solution of this application embodiment, the relationship between the resistance value of the second protection component 132 and the resistance value of the first protection component 131 is provided, which is beneficial for insulation detection and makes insulation failure more sensitive to be detected.

[0123] 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.

[0124] The third protection component 133 may include a current limiting component and / or an overcurrent component. It is understood that the K branch conductive paths 13 form K nodes X1 to Xk, and any number of first protection components 131 can be set between any two nodes, as detailed in the foregoing embodiments.

[0125] In the technical solution of this application embodiment, the third protection component 133 is set on K branches. In the event of insulation failure of more than one electrical box (support member 12), it is used for short circuit protection, which reduces the possibility of high voltage arcing and battery combustion and explosion, while making the wiring more flexible.

[0126] In some embodiments, the third protection component 133 includes at least one third sub-protection component, which is connected in series with any 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 with any branch.

[0127] In the technical solution of this application embodiment, the number of third sub-protection components can be reduced, thus saving costs.

[0128] In some embodiments, the third protection component 133 includes K third sub-protection components, which are connected in series on the K branches.

[0129] It is understandable that a third sub-protection assembly is provided between each adjacent support member 12, so that in the event of insulation failure of any support member 12, there are two third sub-protection assemblies to provide overcurrent protection against short-circuit current.

[0130] In the technical solution of this application embodiment, a third sub-protection component is provided between each adjacent support member 12. In the event of insulation failure of any support member 12, at least two overcurrent third protection components 133 provide short-circuit protection, further reducing the possibility of high-voltage arcing and battery combustion and explosion.

[0131] In some embodiments, the energy storage system further includes capacitive components (not shown). One or more of the first protection components 131, the second protection component 132, and the third protection component 133 are connected in parallel with capacitive components in a one-to-one correspondence. The capacitive components are, for example, capacitors.

[0132] In some embodiments, each protection component (i.e., including 131, 132, 133) includes a current-limiting component for limiting the current in the conductive path 13; or

[0133] Each protection component includes an overcurrent protection component, which is used to protect the current in the conductive path 13 from overcurrent.

[0134] It should be noted that the current-limiting component may include a resistor component, and in specific implementations, the resistance of the current-limiting component can be between kΩ and MΩ. The current-limiting component reduces the short-circuit current, thereby lowering the possibility of high-voltage arcing and battery combustion and explosion, while maintaining the normal operation of the energy storage system.

[0135] Overcurrent protection components may include fuses, electronic circuit breakers, current protection switches, and overcurrent relays. The overcurrent protection components disconnect the support member 12 due to insulation failure, reducing the possibility of high-voltage arcing and battery combustion / explosion, further improving safety and reliability.

[0136] In the technical solutions of this application embodiment, each protection component can be a current limiting component or an overcurrent protection component, which improves the flexibility of protection component configuration.

[0137] In some embodiments, there are N support members; and when N is an even number, the N / 2 and / or N / 2+1 support members 12 are connected to the grounding terminal of the first insulation detection circuit 14 at the connection node Xa; when N is an odd number, the (N+1) / 2 support members 12 are connected to the grounding terminal of the first insulation detection circuit 14 at the connection node Xa.

[0138] By connecting the middle support 12 to the grounding terminal of the first insulation detection circuit 14, the potential difference of each support 12 can be made equal, which further improves the safety and reliability of the energy storage system.

[0139] Understandably, when N is odd, the voltage between connection node Xa and the main positive line V+ is the first voltage value, and the voltage between connection node Xa and the main negative line V- is the second voltage value; the first and second voltage values ​​are equal. When N is odd, the voltage between connection node Xa and the main positive line V+ is the first voltage value, and the voltage between connection node Xa and the main negative line V- is the second voltage value; the first and second voltage values ​​are closest.

[0140] In some embodiments, the first insulation detection circuit 14 and the second insulation detection circuit 15 may be implemented using conventional insulation detection circuits.

[0141] Please refer to 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.

[0142] The first reference resistor Rm1 and the first detection switch K1 are connected in series between the main positive line V+ and the connection node Xa;

[0143] The second reference resistor Rm2 and the second detection switch K2 are connected in series between the main negative line V- and the connection node Xa.

[0144] For example, the first detection switch K1 and the second detection switch K2 are, for example, semiconductor transistors, relays, contactors or circuit breakers.

[0145] In the technical solution of this application embodiment, a detection topology for the insulation parameters of an energy storage system is provided. A detection switch is used to control the connection of a reference resistor to the energy storage system, and the insulation parameters of the energy storage system are calculated by detecting the relevant electrical parameters on the reference resistor.

[0146] Please refer to 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.

[0147] The third reference resistor Rm3 and the fourth reference resistor Rm4 are connected in series between the main positive line V+ and the connection node Xa;

[0148] 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.

[0149] In the technical solution of this application embodiment, another topology for detecting the insulation parameters of an energy storage system is provided. A detection switch is used to control the connection of a reference resistor to the energy storage system, and the insulation parameters of the energy storage system are calculated by detecting the relevant electrical parameters on the reference resistor.

[0150] It is understood that in the second insulation detection circuit 15, referring to the specific embodiment of the first insulation detection circuit 14 described above, the connection node Xa in the first insulation detection circuit 14 can be replaced and connected to the electrical platform 10.

[0151] According to some embodiments of this application, referring to Figures 7 and 8, the insulation monitoring process involves sampling the voltage values ​​twice under different detection switch states of the insulation detection circuit 14, and then using the sampled voltage and reference resistance to establish an equation to solve for 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 Riy is formed between the total negative line V- and the connection node Xa.

[0152] Example 1, please refer to Figure 7. With the first detection switch K1 and the second detection switch K2 open, detect the first voltage V1 between the positive line V+ and the connection node Xa, and the second voltage V2 between the negative line V- and the connection node Xa. Close the first detection switch K1 (in other examples, the second detection switch K2 can be closed), detect the third voltage V1' between the positive line V+ and the connection node Xa, and the fourth voltage V2' between the negative line V- and the connection node Xa. Derive the resistance values ​​of the two insulation resistors:

[0153] Example 2, please refer to Figure 8. With the first detection switch K1 closed and the second detection switch K2 open, the fifth voltage V3 across the fourth reference resistor Rm4 and the sixth voltage V4 across the fifth reference resistor Rm5 are detected. Based on the principle of equal loop current, the following is obtained:

[0154] With the first detection switch K1 open and the second detection switch K2 closed, the seventh voltage V3' across the fourth reference resistor Rm4 and the eighth voltage V4' across the fifth reference resistor Rm5 are detected. Based on the principle of equal loop current, the following is obtained:

[0155] The resistance values ​​of the two insulation resistors are derived from formulas (3) and (4).

[0156] The above insulation monitoring process and calculation of the two insulation resistances are only examples. During the implementation of the scheme, the specific methods for insulation monitoring and insulation resistance calculation are not limited to these. The insulation parameters detected by the second insulation detection circuit 15 between the main positive line V+ and the electrical platform 10, and between the main negative line V- and the electrical platform 10, can refer to the above example and will not be repeated here.

[0157] Secondly, embodiments of this application provide a power supply device, which includes the energy storage system described above.

[0158] According to some embodiments of this application, this application also provides a power supply device including an energy storage system of any of the above solutions.

[0159] In practice, the power supply device may include an energy storage station. The energy storage system stores electrical energy in the energy storage station and releases electrical energy when the power grid is short of energy.

[0160] Since the power supply device includes an energy storage system based on any of the above schemes, it can provide overcurrent protection against short-circuit current, reducing the possibility of high-voltage arcing and battery combustion and explosion.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, wherein, It includes a main positive line, a main negative line, and a battery module connected between the main positive line and the main negative line, the battery module including multiple battery components connected in series; The energy storage system also includes: Multiple support members are provided, and each battery component is supported by a corresponding support member. Each battery component is insulated from each support member. At least one protective component is provided between any two support members, and at least one node is formed between the at least one protective component. A first insulation detection circuit, wherein a first terminal of the first insulation detection circuit is connected to the main positive line, a second terminal of the first insulation detection circuit is connected to the main negative line, and a ground terminal of the first insulation detection circuit is connected to a connection node, wherein the at least one node includes the connection node; The second insulation detection circuit has a first terminal connected to the main positive line, a second terminal connected to the main negative line, and a ground terminal connected to the power platform.

2. The energy storage system according to claim 1, wherein, It also includes a voltage equalization circuit, which is connected between the main positive line and the main negative line, and the midpoint of the voltage equalization circuit is connected to the electrical platform.

3. The energy storage system according to claim 2, wherein, The voltage equalization circuit includes a first voltage equalization component and a second voltage equalization component. The first voltage equalization component and the second voltage equalization component are connected in series between the main positive line and the main negative line. The series node of the first voltage equalization component and the second voltage equalization component constitutes the midpoint of the voltage equalization circuit.

4. The energy storage system according to claim 1, wherein, It also includes a support device, in which the battery module, the support member, and the first insulation detection circuit are disposed, and the support device is used to provide insulation support for the support member and the first insulation detection circuit. The support device is also connected to the electric platform.

5. The energy storage system according to claim 4, wherein, The supporting equipment also includes a first supporting device, the first insulation detection circuit is insulated and supported by the first supporting device, and the first supporting device and the supporting equipment are connected to the electrical platform.

6. The energy storage system according to claim 5, wherein, The first support device is also provided with an auxiliary battery management device, which is insulated and supported by the first support 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 main positive line and the connection node and between the main negative line and the connection node.

7. The energy storage system according to claim 1, wherein, It also includes a second support device, the second insulation detection circuit is supported by the second support device, and the grounding terminal of the second insulation detection circuit and the second support device are connected to the electric platform.

8. The energy storage system according to claim 7, wherein, The second support device is also equipped with a battery management controller, which is insulated and supported by the second support 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 main positive line and the electrical platform and between the main negative line and the electrical platform.

9. The energy storage system according to any one of claims 1 to 7, wherein, The energy storage system further includes a conductive path, and K of the multiple support members are respectively connected to the conductive path through K branches, where K is a positive integer; the conductive path and / or the branches are provided with the protection components.

10. The energy storage system according to claim 9, wherein, The protection component includes a first protection component, and the first protection component is connected in series between the K nodes formed by the K branches connected to the conductive path.

11. The energy storage system according to claim 9 or 10, wherein, The protection assembly also includes two second protection assemblies; the positive terminal of the first battery assembly is connected to the total positive line, and the negative terminal of the last battery assembly is connected to the total negative line; The first branch of the K branches is connected between the first node formed by the conductive path and the total positive line, connecting one of the two second protection components; and the Kth branch of the K branches is connected between the Kth node formed by the conductive path and the total negative line, connecting the other of the two second protection components.

12. The energy storage system according to claim 9, 10 or 11, wherein, 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 1 or 9, wherein, The protection component includes a current-limiting component, which limits the current in the conductive path; or The protection component includes an overcurrent protection component, which is used to provide overcurrent protection for the conductive path.

14. The energy storage system according to claim 1, wherein, The number of support members is N; and When N is an even number, the N / 2 and / or N / 2+1th support member is connected to the connection node along with the grounding terminal of the first insulation detection circuit; When N is an odd number, the (N+1) / 2th support member and the grounding terminal of the first insulation detection circuit are connected to the connection node.

15. A power supply device, wherein, The power supply device includes an energy storage system as described in any one of claims 1 to 14.

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