Energy storage circuit and power supply apparatus

Abstract

An energy storage circuit and a power supply apparatus, belonging to the technical field of power supplies. The energy storage circuit comprises a main positive line, a main negative line, at least one first current limiting component and a battery module connected between the main positive line and the main negative line. The battery module comprises a plurality of battery components which are sequentially connected in series; the plurality of battery components are respectively supported in a one-to-one correspondence by a plurality of support members; the battery components are insulated from the support members; and each first current limiting component is connected between two adjacent support members and is used for limiting the current between the two adjacent support members. Therefore, in case of double-point insulation failures across electrical boxes (support members), the present application reduces short-circuit currents, thus reducing the possibility of causing high-voltage sparking and battery combustion or explosion.

Description

Energy storage circuit and power supply device Technical Field

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

[0002] The relevant energy storage circuit includes multiple battery packs connected in series and / or in parallel. The short-circuit protection method is to set a fuse at the positive pole or the negative pole of the energy storage circuit, 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 pole and the negative pole of the energy storage circuit. However, when a double-point insulation failure occurs across the electrical box (support), that is, when insulation failure occurs in the two electrical 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.

[0003] Therefore, the related energy storage circuit cannot reduce the safety risk in the event of double-point insulation failure across the electrical box.

[0004] Application Contents

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

[0006] In a first aspect, the present application provides an energy storage circuit according to an embodiment of the present application, comprising a total positive circuit, a total negative circuit, at least one first current limiting component, and a battery module connected between the total positive circuit and the total negative circuit, wherein the battery module comprises a plurality of battery assemblies connected in series, wherein the plurality of battery assemblies are supported by a plurality of supporting members in a one-to-one correspondence;

[0007] The battery assembly is insulated from the support member;

[0008] The first current limiting component is connected between two adjacent support members; the first current limiting component is used to limit the current between the two adjacent support members.

[0009] In the technical solution of the embodiment of the present application, since the battery assembly and the support are insulated, the first current limiting assembly is connected in series between two adjacent support members. Therefore, in the event of double-point insulation failure across the electrical box (support members), that is, when insulation failure occurs in the support members respectively, one or more first current limiting assemblies are connected in series between the two support members with insulation failure. Due to the current limiting effect of one or more first current limiting assemblies, the short-circuit current is reduced, and the possibility of high-voltage ignition and battery combustion and explosion is reduced.

[0010] In some embodiments, the plurality of battery assemblies is n battery assemblies, and the plurality of support members is n support members;

[0011] The i-th battery assembly is supported by the i-th support member;

[0012] There are n-1 first current limiting components, and the n-1 first current limiting components are connected in series between adjacent support members in a one-to-one correspondence;

[0013] Wherein, n is an integer greater than or equal to 2, and i is a positive integer less than or equal to n.

[0014] By adopting the above solution, a first current-limiting component is provided between each adjacent support member. In the event of insulation failure in any two support members, there is a current-limiting component to limit the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0015] In some embodiments, the energy storage circuit further includes two second current limiting components;

[0016] The positive electrode of the first battery assembly is connected to the total positive circuit, and the negative electrode of the nth battery assembly is connected to the total negative circuit;

[0017] A second current limiting component is respectively connected in series between the first support member and the total positive circuit, and between the nth support member and the total negative circuit; the second current limiting component is used to limit the current between the first support member and the total positive circuit, and the current between the nth support member and the total negative circuit.

[0018] By connecting a second current-limiting component in series between the first support member and the total positive circuit and between the nth support member and the total negative circuit, in the event of insulation failure of the first support member and / or the nth support member, there is a current-limiting component to limit the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0019] In some embodiments, the energy storage circuit further includes a first electrical cabinet;

[0020] The total negative line and the first electrical cabinet are connected to the electrical platform; or

[0021] The main positive line and the first electrical cabinet are connected to the electrical platform; or

[0022] Any one of the supporting members and the first electrical cabinet are connected to the electrical platform.

[0023] By adopting the above solution, since the total negative line and the first electric cabinet are connected to the electric platform in common; or since the total positive line and the first electric cabinet are connected to the electric platform in common; or any one of the support members and the first electric cabinet are connected to the electric platform in common; the voltage-equalizing chain including multiple first current-limiting components and two second current-limiting components simultaneously serves as a voltage-dividing resistor, thereby eliminating the need to set a voltage-dividing resistor, simplifying the hardware design and saving costs.

[0024] In some embodiments, the total positive line and the total negative line are sequentially connected in series with an isolating switch assembly, a relay assembly, and a filter circuit; the filter circuit is configured to filter the first direct current output by the battery module;

[0025] The second current limiting component is connected in common with the isolation switch component; or

[0026] The second current limiting component is connected to the isolation switch component and the relay component; or

[0027] The second current limiting component is connected in common with the filter circuit.

[0028] By sequentially connecting the isolating switch assembly, the relay assembly and the filter circuit in series on the total positive line and the total negative line, the stability of the first direct current is improved, and the flexibility of the first direct current output is improved; the first support member and the second current limiting assembly are connected to different positions on the total positive line and the total negative line, thereby improving the flexibility of energy storage circuit protection.

[0029] In some embodiments, the resistance value of each of the first current limiting components is a first preset resistance value;

[0030] The resistance of each of the second current-limiting components is less than or equal to the first preset resistance.

[0031] By adopting the above solution, the pressure difference between each adjacent support member is equal. In the event of insulation failure in two support members, the stability of the current limiting effect of one or more first current limiting components is improved, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0032] In some embodiments, the resistance of each of the second current limiting components is half of the first preset resistance.

[0033] By adopting the above solution, the pressure differences between adjacent support members are equal, and the pressure difference between the first support member and the total positive circuit and the pressure difference between the nth support member and the total negative circuit are both half of the pressure difference between adjacent support members, which further improves the stability of the current limiting effect of the pressure equalizing chain and further reduces the possibility of high-voltage ignition and battery combustion and explosion.

[0034] In some embodiments, when n is an even number, the n / 2th support member and the first electrical cabinet are connected to the electrical platform;

[0035] When n is an odd number, the (n+1) / 2th support member and the first electrical cabinet are connected to the electrical platform.

[0036] By adopting the above solution, the middlemost support member and the first electrical cabinet are connected to the electrical platform. Therefore, when the electrical platform is grounded, the maximum value of the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line are minimized, thereby further improving the safety and reliability of the energy storage circuit.

[0037] In some embodiments, the energy storage circuit further comprises:

[0038] a plurality of first capacitive components connected in parallel with the plurality of first current-limiting components in a one-to-one correspondence;

[0039] By adopting the above solution, in the event of lightning strikes, surges, etc., each first capacitive component suppresses the voltage spike on each first current-limiting component, thereby reducing the possibility of breakdown of the first current-limiting component and improving the reliability of the energy storage circuit. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage circuit.

[0040] In some embodiments, the energy storage circuit further comprises:

[0041] A plurality of second capacitive components are connected in parallel with the plurality of second current-limiting components in a one-to-one correspondence.

[0042] By adopting the above solution, in the event of lightning strikes, surges, etc., each second capacitive component suppresses the voltage spike on each second current-limiting component, thereby reducing the possibility of breakdown of the second current-limiting component and improving the reliability of the energy storage circuit. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage circuit.

[0043] In some embodiments, the capacitance of each of the first capacitive components is a first preset capacitance;

[0044] The capacitance of each of the second capacitive components is half of the first preset capacitance.

[0045] By adopting the above solution, the capacitance values ​​of the first capacitive components are equal, so that the peak voltage suppression capabilities of the supporting members are the same, further improving the stability and reliability of the energy storage circuit.

[0046] In some embodiments, the energy storage circuit further includes a second electrical cabinet and two voltage dividing components;

[0047] The two voltage dividing components are connected in series between the total positive circuit and the total negative circuit;

[0048] The two voltage dividing components and the second electrical cabinet are connected to the electrical platform.

[0049] By adopting the above scheme, by providing two voltage-dividing components and a second electrical cabinet, and clamping the common contact of the two voltage-dividing components and the second electrical cabinet at the potential of the electrical platform, the safety of the energy storage circuit is improved, and the maximum value of the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line is minimized, further improving the safety and reliability of the energy storage circuit.

[0050] In some embodiments, a plurality of third capacitive components are further included;

[0051] Each of the first current limiting components is connected in parallel with each of the third capacitive components.

[0052] By adopting the above solution, in the event of lightning strike, surge, etc., each third capacitive component suppresses the peak voltage of the voltage on each first current limiting component, thereby reducing the possibility of breakdown of the first current limiting component and improving the reliability of the energy storage circuit.

[0053] In some embodiments, the energy storage circuit further comprises:

[0054] The conversion circuit is connected to the total positive line and the total negative line, and is configured to convert the first direct current output by the battery module to output alternating current.

[0055] By adopting the above solution, the first direct current is converted into alternating current to achieve alternating current output of the energy storage module.

[0056] In a second aspect, an embodiment of the present invention further provides a power supply device, which includes a load and the above-mentioned energy storage circuit.

[0057] 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

[0058] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0059] FIG1 is a schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0060] FIG2 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0061] FIG3 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0062] FIG4 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0063] FIG5 is a schematic diagram of a partial circuit example of an energy storage circuit provided in one embodiment of the present application;

[0064] FIG6 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0065] FIG7 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0066] FIG8 is another structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0067] FIG9 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0068] FIG10 is another schematic structural diagram of an energy storage circuit provided in one embodiment of the present application;

[0069] FIG11 is a schematic diagram showing a partial circuit example of an energy storage circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0072] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0073] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0074] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0075] 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).

[0076] Currently, market developments indicate that energy storage systems are becoming increasingly widespread. They are widely used in transmission and distribution grids. As their application areas continue to expand, market demand for them is also growing.

[0077] With the widespread application of energy storage power systems in transmission and distribution networks, solving the power supply problem of equipment has become a current social issue. Energy storage circuits have attracted attention due to the safety and reliability of their discharge. The relevant energy storage circuit includes a total positive line and a total negative line, and a battery module connected between the total positive line and the total negative line, and the battery module has multiple battery packs connected in series; each battery pack includes a first metal shell, a second metal shell arranged in the first metal shell, and a battery cell group arranged in the second metal shell, and the first metal shell and the second metal shell are insulated; a protective resistor is connected between the first metal shell and the second metal shell in each battery pack, and the first metal shell in each battery pack is grounded; thereby suppressing short-circuit current. However, this energy storage circuit can only suppress short-circuit current when insulation failure occurs in a single electrical box, and cannot reduce short-circuit current in the case of double-point insulation failure across the electrical box (support member), resulting in poor safety and reliability.

[0078] In order to solve the problem of being unable to reduce the short-circuit current in the event of double-point insulation failure across the electrical box (support), the applicant has discovered that a first current-limiting component can be connected in series between adjacent supports in the design, and the current between the two electrical boxes where insulation failure occurs can be limited by the first current-limiting component, thereby improving the safety and reliability of the energy storage circuit.

[0079] According to some embodiments of the present application, referring to FIG. 1 , FIG. 1 shows a schematic structural diagram of an energy storage circuit provided in an embodiment of the present application. For ease of illustration, only portions related to the present embodiment are shown, which are described in detail as follows:

[0080] The above-mentioned energy storage circuit includes a total positive circuit, a total negative circuit, at least one first current limiting component 13 and a battery module connected between the total positive circuit and the total negative circuit, and the battery module includes multiple battery components 11 connected in series in sequence, and the multiple battery components 11 are respectively supported by multiple support members 12.

[0081] The battery assembly 11 is insulated from the support member 12 .

[0082] A first current limiting component 13 is connected between two adjacent support members 12 ; the first current limiting component 13 is used to limit the current between the two adjacent support members 12 .

[0083] It is understood that 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 known 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 refers to a thin plate located below the battery assembly 11. Its main function is to conduct heat from the battery to maintain a stable battery temperature, thereby improving the battery's operating efficiency. The first current limiting component 13 can include a first resistor component. In a specific embodiment, the resistance of the first current limiting component 13 can be between the kΩ level and the MΩ level. When there are two support members 12, there is one first current limiting component 13; when there are three or more support members 12, there can also be multiple first current limiting components 13, with a first current limiting component 13 provided between each two adjacent support members 12. It should be noted that Figure 1 only shows the case of multiple first current limiting components 13.

[0084] In the technical solution of the embodiment of the present application, since the battery assembly 11 and the support member 12 are insulated, the first current limiting assembly 13 is connected in series between two adjacent support members 12. Therefore, in the event of double-point insulation failure across the electrical box (support member 12), that is, when insulation failure occurs in each support member 12, one or more first current limiting assemblies 13 are connected in series between the two support members 12 with insulation failure. Due to the current limiting effect of one or more first current limiting assemblies 13, the short-circuit current is reduced, and the possibility of high-voltage ignition and battery combustion and explosion is reduced.

[0085] According to some embodiments of the present application, optionally, please continue to refer to FIG. 1 , the plurality of battery assemblies 11 is n battery assemblies 11 , and the plurality of support members 12 is n support members 12 .

[0086] The i-th battery assembly 11 is supported by the i-th support member 12 .

[0087] There are n-1 first current limiting components 13 , and the n-1 first current limiting components 13 are connected in series between adjacent support members 12 in a one-to-one correspondence.

[0088] Wherein, n is an integer greater than or equal to 2, and i is a positive integer less than or equal to n.

[0089] It is understandable that a first current limiting component 13 is provided between each adjacent support member 12 , so when insulation failure occurs in any two support members 12 , one or more current limiting components will limit the short-circuit current.

[0090] By adopting the above solution, when insulation failure occurs in any two support members 12, one or more current limiting components will limit the short-circuit current, thereby further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0091] According to some embodiments of the present application, optionally, please continue to refer to FIG2 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is detailed as follows:

[0092] In addition to all the components and assemblies of the energy storage circuit shown in FIG. 1 , the energy storage circuit further includes two second current limiting components 14 .

[0093] The positive electrode of the first battery assembly 11 is connected to the total positive line, and the negative electrode of the nth battery assembly 11 is connected to the total negative line.

[0094] A second current limiting component 14 is connected in series between the first support member 12 and the total positive line, and between the nth support member 12 and the total negative line respectively; the second current limiting component 14 is used to limit the current between the first support member 12 and the total positive line, and the current between the nth support member 12 and the total negative line.

[0095] It should be noted that the second current limiting component 14 may include a second resistor component.

[0096] The plurality of first current limiting components 13 and the two second current limiting components 14 form a voltage balancing chain to balance the voltage between each two adjacent support members 12 .

[0097] A second current limiting component 14 is connected in series between the first support member and the total positive circuit and between the nth support member 12 and the total negative circuit. In the event of insulation failure of the first support member 12 and / or the nth support member 12, there is a current limiting component to limit the short-circuit current, further reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0098] According to some embodiments of the present application, optionally, please continue to refer to FIG3 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0099] In addition to all the components and assemblies of the energy storage circuit shown in FIG. 2 , the energy storage circuit further includes a first electrical cabinet 20 .

[0100] The total negative line and the first electrical cabinet 20 are connected to the electrical platform; or

[0101] The total positive line and the first electrical cabinet 20 are connected to the electrical platform; or

[0102] Any one of the supporting members 12 and the first electrical cabinet 20 are connected to the electrical platform.

[0103] It should be noted that the electrical platform may be an object with equipotential. In some embodiments, the electrical platform may be a power ground or be connected to a power ground.

[0104] Any node in the voltage-sharing chain can be connected to the power platform. The voltage of the total negative line and the voltage of the total positive line change with the change of the node connected to the power platform, thereby adapting to various application scenarios and enriching the functions of the product.

[0105] By adopting the above solution, since the total negative line and the first electric cabinet 20 are connected to the electric platform in common; or since the total positive line and the first electric cabinet 20 are connected to the electric platform in common; or any one of the support members 12 and the first electric cabinet 20 are connected to the electric platform in common; the voltage equalizing chain including multiple first current limiting components 13 and two second current limiting components 14 can be used as a voltage dividing resistor at the same time, thereby eliminating the need to set a voltage dividing resistor, simplifying the hardware design and saving costs.

[0106] According to some embodiments of the present application, optionally, please continue to refer to FIG4 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0107] In addition to all the components and assemblies of the energy storage circuit shown in FIG3 , the above energy storage circuit includes an isolating switch assembly 100, a relay assembly 200, and a filter circuit 40 connected in series on the total positive line and the total negative line. The filter circuit 40 is configured to filter the first DC power output by the battery module.

[0108] The second current limiting component 14 is only connected to the isolation switch component 100; or

[0109] The second current limiting component 14 is connected to the isolation switch component 100 and the relay component 200; or

[0110] The second current limiting component 14 is connected to the filter circuit 40 .

[0111] When the second current limiting component 14 is only connected to the isolating switch component 100, the convenience of wiring is improved, there is no need to configure different protection methods for various working conditions, and the voltage equalizing chain is in a non-suspended state, and the protection method is simple.

[0112] When the second current limiting component 14 is connected to the isolating switch component 100 and the relay component 200, disconnecting the isolating switch component 100 can disconnect the voltage of the voltage balancing chain, thereby improving safety. However, the voltage balancing chain is in a suspended state.

[0113] When the second current limiting component 14 and the filter circuit 40 are connected together, the voltage balancing chain is connected to the AC side of the energy storage circuit, and the voltage balancing chain is in a non-suspended state.

[0114] In a specific implementation, as shown in FIG5 , the isolating switch assembly 100 includes a first isolating switch KG1 and a second isolating switch KG2 ; the first isolating switch KG1 is connected in series to the total positive line, and the second isolating switch KG2 is connected in series to the total negative line.

[0115] The relay assembly 200 includes a pre-charge assembly connected in series on the total positive line and a first relay K1 connected in series on the total negative line; wherein, the pre-charge assembly includes a second relay K2, a third relay K3 and a first resistor R1; the third relay K3 and the first resistor R1 are connected in series and then connected in parallel with the second relay K2.

[0116] The filter circuit 40 includes a first inductor L1, a second inductor L2 and a first capacitor C1; the first inductor L1 is connected in series to the total positive line, the second inductor L2 is connected in series to the total negative line; the first capacitor C1 is connected between the total positive line and the total negative line.

[0117] By sequentially connecting the isolating switch assembly, the relay assembly and the filter circuit in series on the total positive line and the total negative line, the stability of the first direct current is improved, and the flexibility of the first direct current output is improved; the first support member and the second current limiting assembly are connected to different positions on the total positive line and the total negative line, thereby improving the flexibility of energy storage circuit protection.

[0118] In some embodiments, the resistance of each first current limiting component 13 is a first preset resistance; and the resistance of each second current limiting component 14 is less than or equal to the first preset resistance.

[0119] By adopting the above solution, the pressure difference between each adjacent support member 12 is equal. In the event of insulation failure in two support members 12, the stability of the current limiting effect of one or more first current limiting components 13 is improved, and the possibility of high-voltage ignition and battery combustion and explosion is further reduced.

[0120] In some embodiments, the resistance of each second current limiting component 14 is half of the first preset resistance.

[0121] It can be understood that the pressure difference between adjacent support members 12 is Vbus / n; the pressure difference between the first support member 12 and the total positive line is Vbus / 2n; and the pressure difference between the nth support member 12 and the total negative line is Vbus / 2n, where Vbus / is the pressure difference between the total negative line and the total positive line. Thus, the first current limiting assembly 13 and the second current limiting assembly 14 achieve pressure balance between adjacent support members 12.

[0122] By adopting the above solution, the pressure differences between adjacent support members 12 are equal, and the pressure difference between the first support member 12 and the total positive circuit and the pressure difference between the nth support member 12 and the total negative circuit are both half of the pressure difference between adjacent support members 12, which further improves the stability of the current limiting effect of the pressure equalizing chain and further reduces the possibility of high-voltage ignition and battery combustion and explosion.

[0123] In some embodiments, when n is an even number, the n / 2th support member 12 and the first electrical cabinet 20 are connected to the electrical platform.

[0124] When n is an odd number, the (n+1) / 2th support member 12 and the first electrical cabinet 20 are connected to the electrical platform.

[0125] It can be understood that when n is an odd number, the voltage between the power platform and the total positive line is a first voltage, the voltage between the power platform and the total negative line is a second voltage, the first voltage and the second voltage are equal, and when the power platform is grounded, the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line are minimum. When n is an odd number, the voltage between the power platform and the total positive line is a first voltage, the voltage between the power platform and the total negative line is a second voltage, and the first voltage and the second voltage are closest to each other. When the power platform is grounded, similarly, the maximum absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line are minimum.

[0126] By adopting the above solution, the middlemost support member 12 and the first electrical cabinet 20 are connected to the electrical platform. Therefore, when the electrical platform is grounded, the maximum value of the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line are minimized, thereby further improving the safety and reliability of the energy storage circuit.

[0127] According to some embodiments of the present application, optionally, please continue to refer to FIG6 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is detailed as follows:

[0128] In addition to all the components and assemblies of the energy storage circuit shown in FIG. 4 , the energy storage circuit further includes a plurality of first capacitive components 15 .

[0129] The plurality of first capacitive components 15 and the plurality of first current limiting components 13 are connected in parallel in a one-to-one correspondence.

[0130] In the event of lightning strikes, surges, and the like, a peak current may appear on each first current limiting component 13 , and each first capacitive component 15 suppresses the peak voltage on each first current limiting component 13 .

[0131] By adopting the above solution, in the event of lightning strikes, surges, etc., each first capacitive component suppresses the voltage spike on each current limiting component, thereby reducing the possibility of breakdown of the first current limiting component 13 and improving the reliability of the energy storage circuit. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage circuit.

[0132] According to some embodiments of the present application, optionally, please continue to refer to FIG7 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0133] In addition to all the components and assemblies of the energy storage circuit shown in FIG6 , the energy storage circuit further includes a plurality of second capacitive components 16 .

[0134] The plurality of first capacitive components 15 are connected in parallel with the plurality of first current-limiting components 13 in a one-to-one correspondence; the plurality of second capacitive components 16 are connected in parallel with the plurality of second current-limiting components 14 in a one-to-one correspondence.

[0135] In the event of lightning strikes, surges, and the like, a peak current may appear on each second current limiting component 14 , and each second capacitive component 16 suppresses the peak voltage on each second current limiting component 14 .

[0136] By adopting the above solution, in the event of lightning strikes, surges, etc., each second capacitive component suppresses the voltage spike on each second current limiting component, thereby reducing the possibility of breakdown of the second current limiting component 14 and improving the reliability of the energy storage circuit. At the same time, the spike voltage between the total positive line and the total negative line is filtered out, thereby improving the stability of the energy storage circuit.

[0137] In some embodiments, the capacitance of each first capacitive component 15 is the first preset capacitance; and the capacitance of each second capacitive component 16 is half of the first preset capacitance.

[0138] Since the quotient of the capacitance of each capacitive component and the resistance of the corresponding current-limiting component is the same, the peak voltage suppression capability of the voltage between each support member 12 is the same.

[0139] By adopting the above solution, the capacitance values ​​of the first capacitive components 15 are equal, so that the peak voltage suppression capabilities between the support members 12 are the same, further improving the stability and reliability of the energy storage circuit.

[0140] According to some embodiments of the present application, optionally, please continue to refer to FIG8 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0141] In addition to all the components and assemblies of the energy storage circuit shown in FIG1 , the energy storage circuit further includes a second electrical cabinet 30 and two voltage divider assemblies 18 ;

[0142] Two voltage divider components 18 are connected in series between the total positive line and the total negative line;

[0143] The two voltage divider components 18 and the second electrical cabinet 30 are connected to the electrical platform.

[0144] It can be understood that the resistance values ​​of the two voltage divider components 18 are the same. By connecting the two voltage divider components 18 and the second electrical cabinet 30 to the electrical platform, the voltage between the electrical platform and the total positive line is the first voltage, and the voltage between the electrical platform and the total negative line is the second voltage. The first voltage and the second voltage are equal. When the electrical platform is grounded, the absolute value of the potential of the total positive line and the absolute value of the potential of the total negative line are minimized.

[0145] By adopting the above scheme, by providing two voltage-dividing components 18 and a second electrical cabinet 30, and clamping the common point of the two voltage-dividing components 18 and the second electrical cabinet 30 at the potential of the electrical platform, the safety of the energy storage circuit is improved, and the maximum value of the absolute value of the voltage of the total positive line and the absolute value of the voltage of the total negative line is minimized, thereby further improving the safety and reliability of the energy storage circuit.

[0146] According to some embodiments of the present application, optionally, please continue to refer to FIG9 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is detailed as follows:

[0147] In addition to all the components and assemblies of the energy storage circuit shown in FIG8 , the energy storage circuit further includes a plurality of third capacitive components 17 .

[0148] Each first current limiting component 13 is connected in parallel with each third capacitive component 17 .

[0149] In a specific implementation, the resistance of each first current limiting component 13 is the same, and the capacitance of each third capacitive component 17 is the same, so that the pressure difference between each adjacent support member 12 is the same, and the peak voltage suppression capability between each support member 12 is the same.

[0150] By adopting the above solution, in the event of lightning strike, surge, etc., each third capacitive component 17 suppresses the peak voltage of the voltage on each first current limiting component 13, thereby reducing the possibility of breakdown of the first current limiting component 13 and improving the reliability of the energy storage circuit.

[0151] According to some embodiments of the present application, optionally, please continue to refer to FIG10 , which shows a schematic structural diagram of an energy storage circuit provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is detailed as follows:

[0152] In addition to all the components and assemblies of the energy storage circuit shown in FIG. 1 , the energy storage circuit further includes a conversion circuit 50 .

[0153] The conversion circuit 50 is connected to the total positive line and the total negative line, and is configured to convert the first direct current output by the battery module into alternating current.

[0154] As an example but not a limitation, as shown in FIG11 , the conversion circuit 50 includes a first IGBT tube M1, a second IGBT tube M2, a third IGBT tube M3, and a fourth IGBT tube M4; the drain of the first IGBT tube M1, the drain of the third IGBT tube M3, the source of the second IGBT tube M2, and the source of the fourth IGBT tube M4 collectively serve as a first DC input terminal of the conversion circuit 50, connected to the total positive line and the total negative line to receive the first DC power; the source of the first IGBT tube M1, the source of the third IGBT tube M3, the drain of the second IGBT tube M2, and the drain of the fourth IGBT tube M4 collectively serve as an AC output terminal of the conversion circuit 50 to output AC power.

[0155] By adopting the above solution, the first direct current is converted into alternating current to achieve alternating current output of the energy storage module.

[0156] According to some embodiments of the present application, the present application also provides a power supply device, including the energy storage circuit of any of the above solutions.

[0157] In a specific implementation, the power supply device may include an energy storage station, and the energy storage circuit stores electrical energy for the energy storage station and releases the electrical energy when the power grid is short of energy.

[0158] Since the power supply device includes the energy storage circuit of any of the above solutions, the short-circuit current can be reduced, thereby reducing the possibility of high-voltage ignition and battery combustion and explosion.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A tank circuit, characterized in that: It includes a total positive circuit, a total negative circuit, at least one first current limiting component, and a battery module connected between the total positive circuit and the total negative circuit, and the battery module includes a plurality of battery components connected in series in sequence, and the plurality of battery components are supported by a plurality of supporting members in a one-to-one correspondence; The battery assembly is insulated from the support member; The first current limiting component is connected between two adjacent support members; the first current limiting component is used to limit the current between the two adjacent support members.

2. The energy storage circuit according to claim 1, characterized in that: The plurality of battery assemblies is n battery assemblies, and the plurality of support members is n support members; The i-th battery assembly is supported by the i-th support member; The number of the first current limiting components is n-1, and the n-1 first current limiting components are connected in series between adjacent supporting members in a one-to-one correspondence; Wherein, n is an integer greater than or equal to 2, and i is a positive integer less than or equal to n.

3. The energy storage circuit according to claim 2, characterized in that: The energy storage circuit also includes two second current limiting components; The positive electrode of the first battery assembly is connected to the total positive circuit, and the negative electrode of the nth battery assembly is connected to the total negative circuit; A second current limiting component is respectively connected in series between the first support member and the total positive circuit and between the nth support member and the total negative circuit; the second current limiting component is used to limit the current between the first support member and the total positive circuit and the current between the nth support member and the total negative circuit.

4. The energy storage circuit according to claim 3, characterized in that: The energy storage circuit also includes a first electrical cabinet; The total negative line and the first electric cabinet are connected to the electric platform; or The main positive line and the first electric cabinet are connected to the electric platform; or Any one of the supporting members and the first electrical cabinet are connected to the electrical platform.

5. The energy storage circuit according to claim 3, characterized in that: The total positive line and the total negative line are connected in series in sequence to an isolating switch component, a relay component and a filter circuit; the filter circuit is configured to filter the first direct current output by the battery module; The second current limiting component is connected together with the isolating switch component; or The second current limiting component is connected to the isolating switch component and the relay component; or The second current limiting component is connected in common with the filtering circuit.

6. The energy storage circuit according to claim 3, characterized in that: The resistance value of each of the first current limiting components is a first preset resistance value; The resistance of each of the second current limiting components is less than or equal to the first preset resistance.

7. The energy storage circuit according to claim 6, characterized in that: The resistance value of each of the second current limiting components is half of the first preset resistance value.

8. The energy storage circuit according to claim 4, characterized in that: When n is an even number, the n / 2th support member and the first electrical cabinet are connected to the electrical platform; When n is an odd number, the (n+1) / 2th supporting member and the first electrical cabinet are connected to the electrical platform.

9. The energy storage circuit according to claim 4, characterized in that: The energy storage circuit also includes: A plurality of first capacitive components are connected in parallel with the plurality of first current limiting components in a one-to-one correspondence.

10. The energy storage circuit according to claim 9, characterized in that: The energy storage circuit also includes: A plurality of second capacitive components are connected in parallel with the plurality of second current limiting components in a one-to-one correspondence.

11. The energy storage circuit according to claim 10, characterized in that: The capacitance of each of the first capacitive components is a first preset capacitance; The capacitance of each of the second capacitive components is half of the first preset capacitance.

12. The energy storage circuit according to claim 1, characterized in that: The energy storage circuit also includes a second electric cabinet and two voltage dividing components; The two voltage dividing components are connected in series between the total positive circuit and the total negative circuit; The two voltage-dividing components and the second electrical cabinet are connected to the electrical platform.

13. The energy storage circuit according to claim 12, characterized in that: Also included are a plurality of third capacitive components; Each of the first current limiting components is connected in parallel with each of the third capacitive components.

14. The energy storage circuit according to any one of claims 1 to 13, characterized in that: Also includes: The conversion circuit is connected to the total positive line and the total negative line, and is configured to convert the first direct current output by the battery module to output alternating current.

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

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