Energy storage sub-module and energy storage system

Abstract

The utility model discloses an energy storage sub-module and an energy storage system, the energy storage sub-module comprises an energy storage sub-module and a redundant power supply module, the redundant power supply module comprises a first energy taking circuit, a second energy taking circuit, a control circuit, a first bypass driving circuit and a second bypass driving circuit; wherein the input end of the first energy taking circuit is connected with the energy storage module, and the output end of the first energy taking circuit is connected with the control circuit and the first bypass driving circuit; the input end of the second energy taking circuit is connected with the power supply interface, and the output end of the second energy taking circuit is connected with the second bypass driving circuit. Thus, the redundant power supply design of the bypass driving circuit can be realized, the number of power supply loads of the second energy taking circuit is smaller than the number of power supply loads of the first energy taking circuit, and the design of the second energy taking circuit can be simplified, so that the economical efficiency of redundant power supply can be improved on the premise of ensuring that the reliability of the energy storage sub-module is not reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to an energy storage sub-module and an energy storage system. Background Technique

[0002] Under the background of the diversification and cleanization of world energy today, the national energy strategy is gradually transforming, and a new power system with new energy as the main body is being constructed. With the development of new energy power, the status of energy storage systems in the power system is becoming increasingly important.

[0003] In related technologies, the power supply methods of energy storage systems are diverse, such as through multiple power supply paths, uninterruptible power supply systems, high-position energy-taking power supplies, etc. Among them, the energy storage system adopts a redundant power supply design, which can ensure that the energy storage system can still supply power continuously when a single power supply fails. Although this improves the reliability of the energy storage system, the existing redundant power supply design requires additional power equipment and control systems, increasing the cost of the energy storage system. Summary of the Utility Model

[0004] The utility model provides an energy storage sub-module and an energy storage system, which can improve the economy of redundant power supply on the premise of not reducing the reliability of the energy storage sub-module.

[0005] The technical solution of the utility model is realized as follows:

[0006] In a first aspect, an embodiment of the utility model provides an energy storage sub-module, which includes an energy storage module and a redundant power supply module. The redundant power supply module includes a first energy-taking circuit, a second energy-taking circuit, a control circuit, a first bypass driving circuit, and a second bypass driving circuit; wherein:

[0007] The input end of the first energy-taking circuit is connected to the energy storage module, and the output end of the first energy-taking circuit is respectively connected to the control circuit and the first bypass driving circuit;

[0008] The input end of the second energy-taking circuit is connected to the power supply interface, and the output end of the second energy-taking circuit is connected to the second bypass driving circuit;

[0009] Wherein, the number of power supply loads of the first energy-taking circuit is more than that of the second energy-taking circuit.

[0010] Through the above technical means, the input end of the first power extraction circuit is connected to the energy storage module, and the output end of the first power extraction circuit is connected to the control circuit and the first bypass drive circuit. At this time, power can be extracted from the energy storage module to supply power to the control circuit and the first bypass drive circuit; the input end of the second power extraction circuit is connected to the power supply interface, and the output end of the second power extraction circuit is connected to the second bypass drive circuit. At this time, power can be extracted from the power supply interface to supply redundant power to the second bypass drive circuit. In this way, the first power extraction circuit and the second power extraction circuit adopt different configuration methods and energy sources, so that the power supply sources of the first bypass drive circuit and the second bypass drive circuit are different, realizing the redundant power supply design of the bypass drive circuit. Moreover, the number of power supply loads of the second power extraction circuit is less than that of the first power extraction circuit. For example, the second power extraction circuit only supplies power to the second bypass drive circuit, and the power supply load is single, so the design of the second power extraction circuit can be simplified, the cost can be reduced, and its economy can be improved; in addition, when the first power extraction circuit is normal, the first power extraction circuit is used to supply power to the first bypass drive circuit, and when the first power extraction circuit is abnormal, the second power extraction circuit is used to supply power to the second bypass drive circuit, thereby improving the safety and reliability of the energy storage sub-module.

[0011] In some embodiments, the power supply interface is connected to other energy storage sub-modules in the energy storage system; or, the power supply interface is connected to an external power supply.

[0012] Through the above technical means, by connecting the power supply interface to other energy storage sub-modules in the energy storage system or an external power supply, when the first power extraction circuit is abnormal, the second power extraction circuit can extract power from other energy storage sub-modules in the energy storage system or an external power supply and supply power to the second bypass drive circuit, improving the reliability of the energy storage sub-module.

[0013] In some embodiments, the energy storage sub-module includes a power module, and the power module includes a support capacitor, where: the power supply interface is connected to the support capacitor in the power module.

[0014] Through the above technical means, since the power supply interface is connected to the support capacitor in the power module, the energy source of the second power extraction circuit is the support capacitor of the power module. In this way, when the first power extraction circuit is abnormal, the second power extraction circuit can extract power from the support capacitor and supply power to the second bypass drive circuit, improving the reliability of the energy storage sub-module. In addition, since the energy source of the first power extraction circuit is the energy storage module and the energy source of the second power extraction circuit is the support capacitor, the input voltage range of the first power extraction circuit is lower than the input voltage range of the second power extraction circuit.

[0015] In some embodiments, the power module includes a power unit and a bypass switch, wherein: a support capacitor is connected in parallel to the output end of the power unit, and the output end of the power unit is connected to the energy storage module; the bypass switch is connected in parallel to the input end of the power unit, and the control end of the bypass switch is respectively connected to the output end of the first bypass driving circuit and the output end of the second bypass driving circuit.

[0016] By means of the above technical means, for the power module, the support capacitor is connected in parallel to the output end of the power unit, and the output end of the power unit is connected to the energy storage module, so that electric energy conversion can be performed by the power unit, and the electric energy can be stored in the support capacitor and the energy storage module. In addition, the bypass switch is connected in parallel to the input end of the power unit, and the control end of the bypass switch is respectively connected to the output end of the first bypass driving circuit and the output end of the second bypass driving circuit. In this way, when an abnormality occurs in the power module, the bypass switch can also be controlled to close by the first bypass driving circuit or the second bypass driving circuit to bypass the power module, thereby improving the reliability of the energy storage sub-module.

[0017] In some embodiments, the second bypass driving circuit includes a second bypass triggering unit and a fault detection unit, wherein: the input end of the fault detection unit is connected to the output end of the power unit; the output end of the fault detection unit is connected to the input end of the second bypass triggering unit, and the output end of the second bypass triggering unit is connected to the control end of the bypass switch.

[0018] By means of the above technical means, the input end of the fault detection unit is connected to the output end of the power unit, and is used to generate a second bypass signal when an abnormality exists in the first power taking circuit and the power module is detected to be abnormal; the output end of the fault detection unit is connected to the input end of the second bypass triggering unit, and is used to send the second bypass signal to the second bypass triggering unit, so that the second bypass triggering unit controls the bypass switch to close according to the second bypass signal to bypass the power module. Thus, when an abnormality exists in the first power taking circuit, the second bypass driving circuit can be made to enter the working state by the second power taking circuit at this time; in this way, when the fault detection unit detects that the power module is abnormal, the bypass switch can also be triggered to close by the second bypass triggering unit, thereby improving the safety and reliability of the energy storage sub-module.

[0019] In some embodiments, the fault detection unit includes a second voltage sampling unit, wherein: the input end of the second voltage sampling unit is connected to the output end of the power unit, and is used to collect the output voltage of the power unit.

[0020] Through the above technical means, when the first energy extraction circuit is abnormal, the second energy extraction circuit can make the second bypass drive circuit enter the working state at this time; in this way, when the second voltage sampling unit in the fault detection unit detects that the output voltage of the power module is abnormal, the second bypass trigger unit can be used to trigger the bypass switch to close, thereby improving the safety and reliability of the energy storage sub-module.

[0021] In some embodiments, the second bypass drive circuit further includes a second bypass switch detection unit, where: the second bypass switch detection unit is connected to the bypass switch and is used to detect whether the bypass switch is successfully closed when bypassing the power module.

[0022] Through the above technical means, the second bypass switch detection unit is connected to the bypass switch. When bypassing the power module, the second bypass switch detection unit can be used to detect whether the bypass switch is successfully closed at this time, which can improve the safety of the energy storage sub-module.

[0023] In some embodiments, the control circuit includes a first voltage sampling unit and a bypass drive control unit, and the first bypass drive circuit includes a first bypass trigger unit and a first communication unit; where: the input end of the first voltage sampling unit is connected to the output end of the power unit; the input end of the bypass drive control unit is connected to the output end of the first voltage sampling unit, and the output end of the bypass drive control unit is connected to the input end of the first communication unit; the output end of the first communication unit is connected to the input end of the first bypass trigger unit, and the output end of the first bypass trigger unit is connected to the control end of the bypass switch.

[0024] Through the above technical means, the input end of the first voltage sampling unit is connected to the output end of the power unit and is used to detect the output voltage of the power module; the output end of the bypass drive control unit is connected to the input end of the first communication unit and is used to send a first bypass signal from the bypass drive control unit to the first communication unit when the power module fails; the output end of the first communication unit is connected to the input end of the first bypass trigger unit and is used to send the first bypass signal to the first bypass trigger unit so that the first bypass trigger unit triggers the bypass switch to close according to the first bypass signal to bypass the power module, thereby avoiding the expansion of the fault and even causing economic losses, and improving the safety and reliability of the energy storage sub-module.

[0025] In some embodiments, the power supply priority of the first energy extraction circuit is higher than that of the second energy extraction circuit, where: when the first energy extraction circuit is normal, the first bypass drive circuit is used to control the opening and closing state of the bypass switch; when the first energy extraction circuit is abnormal, the second bypass drive circuit is used to control the opening and closing state of the bypass switch.

[0026] Through the above technical means, the power supply priority of the first power extraction circuit is higher than that of the second power extraction circuit. When the first power extraction circuit is normal, the on-off state of the bypass switch is controlled by the first bypass drive circuit; when the first power extraction circuit is abnormal, the on-off state of the bypass switch is controlled by the second bypass drive circuit. In this way, redundant power supply is adopted by the first power extraction circuit and the second power extraction circuit. When the first power extraction circuit is abnormal and the power module is abnormal, the closing state of the bypass switch can be controlled by the second bypass drive circuit to bypass the power module, which can improve the safety and reliability of the energy storage sub-module.

[0027] In a second aspect, an embodiment of the present invention provides an energy storage system, which includes at least one energy storage sub-module as described in any one of the first aspects.

[0028] An energy storage sub-module and an energy storage system proposed by an embodiment of the present invention. The energy storage sub-module includes an energy storage module and a redundant power supply module. The redundant power supply module includes a first power extraction circuit, a second power extraction circuit, a control circuit, a first bypass drive circuit, and a second bypass drive circuit. Among them, after the first power extraction circuit takes power from the energy storage module, it supplies power to the control circuit and the first bypass drive circuit; after the second power extraction circuit takes power from the power supply interface, it supplies redundant power to the second bypass drive circuit. In this way, the first power extraction circuit and the second power extraction circuit adopt different configuration methods and energy sources, so that the power supply sources of the first bypass drive circuit and the second bypass drive circuit are different, realizing the redundant power supply design of the bypass drive circuit. Moreover, the number of power supply loads of the second power extraction circuit is less than that of the first power extraction circuit. For example, the second power extraction circuit only supplies power to the second bypass drive circuit, and the power supply load is single, so the design of the second power extraction circuit can be simplified, the cost can be reduced, and its economy can be improved; in addition, when the first power extraction circuit is normal, the first power extraction circuit is used to supply redundant power to the first bypass drive circuit and the second power extraction circuit. When the first power extraction circuit is abnormal, the second power extraction circuit is used to supply power to the second bypass drive circuit, thereby improving the safety and reliability of the energy storage sub-module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present invention Figure 1 ;

[0030] Figure 2 Schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present invention Figure 2 ;

[0031] Figure 3 Schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present invention Figure 3 ;

[0032] Figure 4 Schematic diagram of the composition structure of a first bypass drive circuit provided by an embodiment of the present utility model;

[0033] Figure 5 Schematic diagram of the composition structure of a second bypass drive circuit provided by an embodiment of the present utility model;

[0034] Figure 6 Schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present utility model Figure 4 ;

[0035] Figure 7 Detailed schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present utility model;

[0036] Figure 8 Schematic diagram of the composition of an energy storage system provided by an embodiment of the present utility model. Specific embodiments

[0037] In order to be able to understand the features and technical content of the embodiments of the present utility model in more detail, the implementation of the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present utility model.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used herein are only for the purpose of describing the embodiments of the present utility model and are not intended to limit the present utility model.

[0039] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0040] It should also be noted that the terms "first / second / third" related to the embodiments of the present utility model are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second / third" can be interchanged with a specific order or sequence when allowed, so that the embodiments of the present utility model described herein can be implemented in an order other than that illustrated or described herein.

[0041] In addition, the mention of "embodiment" in this text means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present utility model. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] The following is a relevant introduction to the related technologies of the present utility model.

[0043] Currently, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0044] In the embodiments of the present utility model, the battery can be a battery cell. A battery cell refers to the basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. The battery cell can be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used. The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and there is no limitation here.

[0045] In the embodiments of the present utility model, the battery can also be a single physical module including one or more battery cells to provide a higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0046] Furthermore, with the wide application of batteries in the energy storage field, high-power power electronic devices are increasingly widely used. Taking high-voltage energy storage equipment as an example, it usually includes a high-voltage converter valve and a high-voltage energy storage valve. Among them, the high-voltage converter valve is used to realize the conversion function between alternating current and direct current, and the high-voltage energy storage valve is used to realize the power output and energy storage function.

[0047] In a possible implementation, for a flexible DC power transmission system, the power supply circuit of the flexible DC power transmission system includes two power supplies or two levels of power supply units. Both levels of power supplies or power supply units draw power from the support capacitor, and the power supplies are isolated from each other. At the same time, they supply power to the controller board and the bypass switch driver board. These two power supplies are redundant to each other. When the main power supply fails, the second power supply can still supply energy to the control board and the driver board to ensure all functions of the controller board and the bypass switch driver board. Although there are two complete power supply sources for the power module in this power-taking method, their energy sources all come from the support capacitor.

[0048] In another possible implementation, in the current low-voltage energy storage system, its power supply draws power from the local battery module and the external power supply respectively. When the voltage at the power supply end of the internal battery module is abnormal, the external power supply is turned on to enter the working state. Both the internal power supply and the external power supply can control the internal controller and protection measures of the energy storage system. However, the energy source of the power supply in this low-voltage energy storage system comes from the battery module. This power-taking form is applicable to low-voltage energy storage, but the insulation is difficult in high-voltage energy storage, so this power-taking method is not suitable for high-voltage energy storage systems.

[0049] In yet another possible implementation, for the design of a DC directly-connected energy storage valve, the power module has two complete power supply sources. The energy source of one high-level power supply source comes from the DC support capacitor of the power module itself, and the energy source of the other power supply source comes from the battery module. Both of these power supply sources can independently supply power to the secondary circuit of the power module for long-term operation. However, currently, the power supply source that draws power from the capacitor has a large power-taking range. Due to the differences between the starting condition and the operating condition, its power-taking working range is often from several hundred volts to several thousand volts. Due to the high voltage range and high insulation requirements, the design is complex and the cost is relatively high. In short, the advantage of this type of power supply architecture for the power module is high reliability, but the disadvantage is that the cost of the power supply system is too high.

[0050] Based on this, the embodiment of the utility model provides an energy storage submodule and an energy storage system, wherein the energy storage submodule includes an energy storage module and a redundant power supply module, and the redundant power supply module includes a first energy extraction circuit, a second energy extraction circuit, a control circuit, a first bypass drive circuit and a second bypass drive circuit. Among them, the input end of the first energy extraction circuit is connected to the energy storage module, and the output end of the first energy extraction circuit is connected to the control circuit and the first bypass drive circuit, and is used to supply power to the control circuit and the first bypass drive circuit after taking power from the energy storage module; the input end of the second energy extraction circuit is connected to the power supply interface, and the output end of the second energy extraction circuit is connected to the second bypass drive circuit, and is used to provide redundant power supply to the second bypass drive circuit after taking power from the power supply interface. In this way, the first energy extraction circuit and the second energy extraction circuit adopt different configuration methods and energy sources, so that the power supply sources of the first bypass drive circuit and the second bypass drive circuit are different, realizing the redundant power supply design of the bypass drive circuit, and for example, the second energy extraction circuit only supplies power to the second bypass drive circuit, and the power supply load is single, thereby simplifying the design of the second energy extraction circuit, reducing costs and improving its economy; in addition, the first energy extraction circuit and the second energy extraction circuit are used for redundant power supply, thereby improving the safety of the energy storage sub-module, thereby improving the reliability of the energy storage system.

[0051] The various embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0052] In one embodiment of the present invention, Figure 1 A schematic diagram of the composition structure of an energy storage submodule provided in an embodiment of the utility model Figure 1 .like Figure 1 As shown, the energy storage submodule 10 may include a power module 101, an energy storage module 102, a power supply interface 103 and a redundant power supply module 104, and the redundant power supply module 104 may include a first energy extraction circuit 111, a second energy extraction circuit 112, a control circuit 113, a first bypass drive circuit 114 and a second bypass drive circuit 115. Wherein:

[0053] The input end of the first energy-taking circuit 111 is connected to the energy storage module 102, and the output end of the first energy-taking circuit 111 is connected to the control circuit 113 and the first bypass driving circuit 114 respectively;

[0054] An input end of the second energy extraction circuit 112 is connected to the power supply interface 103 , and an output end of the second energy extraction circuit 112 is connected to the second bypass driving circuit 115 ;

[0055] The number of loads powered by the first energy acquisition circuit 111 is greater than the number of loads powered by the second energy acquisition circuit 112 .

[0056] In an embodiment of the present utility model, the input end of the first power extraction circuit 111 is connected to the energy storage module 102, and the output end of the first power extraction circuit 111 is connected to the control circuit 113 and the first bypass drive circuit 114. At this time, power can be extracted from the energy storage module 102 to supply power to the control circuit 113 and the first bypass drive circuit 114; the input end of the second power extraction circuit 112 is connected to the power supply interface 103, and the output end of the second power extraction circuit 112 is connected to the second bypass drive circuit 115. At this time, redundant power supply can be provided to the second bypass drive circuit 115 after extracting power from the power supply interface 113.

[0057] In an embodiment of the present application, the power module 101 is connected to the energy storage module 102, and the power module 101 can store electrical energy for the energy storage module 102.

[0058] In a possible implementation manner, the power supply interface 103 can be connected to other energy storage sub-modules in the energy storage system.

[0059] Exemplarily, in an embodiment of the present utility model, when the energy storage system includes at least two energy storage sub-modules, the power supply interface 103 can be connected to other energy storage sub-modules in the energy storage system, so that the second power extraction circuit 112 extracts power from other energy storage sub-modules (such as adjacent energy storage sub-modules).

[0060] In another possible implementation manner, the power supply interface 103 can be connected to an external power source.

[0061] Exemplarily, in an embodiment of the present utility model, the power supply interface 103 can be connected to an external power source so that the second power extraction circuit 112 extracts power from the external power source. The power supply interface 103 can also be connected to an AC or DC bus on the power grid so that the second power extraction circuit 112 extracts power from the AC or DC bus. Here, there is no limitation on the specific power extraction device connected to the power supply interface 103, as long as it can satisfy the second power extraction circuit 112 to supply power to the second bypass drive circuit 115 after extracting power from the power extraction device.

[0062] In this way, by connecting the power supply interface 103 to other energy storage sub-modules in the energy storage system or an external power source, when the first power extraction circuit 111 is abnormal, the second power extraction circuit 112 can extract power from other energy storage sub-modules in the energy storage system or an external power source and then supply power to the second bypass drive circuit 115, improving the reliability of the energy storage sub-module 10.

[0063] In addition, in the embodiment of the present utility model, for the energy storage module 102, the main components of the energy storage module 102 include energy storage elements, and the number of energy storage elements is at least one. That is to say, in the embodiment of the present utility model, only one energy storage element may be provided in the energy storage module 102, or multiple energy storage elements may also be provided in the energy storage module 102. Among them, the energy storage elements can have various forms. Exemplarily, they can include batteries, supercapacitors, flywheel energy storage, gas compression energy storage, or any combination thereof. In addition, other devices known in the art that can store electrical energy, such as second-life batteries, can also be selected, and those skilled in the art can make a choice from these devices according to actual needs.

[0064] In a specific embodiment, the energy storage element can be a battery, and the energy storage module 102 can be formed by connecting one or more batteries in series and parallel. At this time, the energy storage module 102 can also be called a battery module.

[0065] That is to say, in the embodiment of the present utility model, the energy storage module 102 can be, for example, a battery, a supercapacitor, flywheel energy storage, gas compression energy storage, or any combination thereof, so as to be able to store and release energy of the energy storage module 102 to support the normal operation of the energy storage sub-module 10.

[0066] The present utility model provides an energy storage sub-module, which includes an energy storage module and a redundant power supply module. The redundant power supply module includes a first power extraction circuit, a second power extraction circuit, a control circuit, a first bypass drive circuit, and a second bypass drive circuit. Since the first power extraction circuit and the second power extraction circuit adopt different configuration methods and energy sources, the power supply sources of the first bypass drive circuit and the second bypass drive circuit are different, realizing the redundant power supply design of the bypass drive circuit. Moreover, the number of power supply loads of the second power extraction circuit is less than that of the first power extraction circuit. For example, the second power extraction circuit only supplies power to the second bypass drive circuit, and the power supply load is single, so that the design of the second power extraction circuit can be simplified, the cost can be reduced, and its economy can be improved. In addition, when the first power extraction circuit is normal, the first power extraction circuit is used to provide redundant power supply for the first bypass drive circuit and the second power extraction circuit. When the first power extraction circuit is abnormal, the second power extraction circuit is used to supply power to the second bypass drive circuit, thereby improving the safety and reliability of the energy storage sub-module.

[0067] In another embodiment of the present utility model, the power module 101 may include a support capacitor. In another possible implementation, the power supply interface 103 is connected to the support capacitor in the power module 101. That is to say, the second power extraction circuit 112 is connected to the support capacitor in the power module 101.

[0068] In some embodiments, Figure 2Schematic diagram of the composition structure of an energy storage sub-module provided by an embodiment of the present utility model Figure 2 As shown Figure 2 in the figure, the energy storage sub-module 10 may include a power module 101, an energy storage module 102, and a redundant power supply module 104. The redundant power supply module 104 may include a first power extraction circuit 111, a second power extraction circuit 112, a control circuit 113, a first bypass drive circuit 114, and a second bypass drive circuit 115, where:

[0069] The input end of the first power extraction circuit 111 is connected to the energy storage module 102, and the output end of the first power extraction circuit 111 is connected to the control circuit 113 and the first bypass drive circuit 114;

[0070] The input end of the second power extraction circuit 112 is connected to the support capacitor in the power module 101, and the output end of the second power extraction circuit 112 is connected to the second bypass drive circuit 115.

[0071] In the embodiment of the present utility model, the input end of the first power extraction circuit 111 is connected to the energy storage module 102, and the output end of the first power extraction circuit 111 is connected to the control circuit 113 and the first bypass drive circuit 114, which is used to supply power to the control circuit 113 and the first bypass drive circuit 114 after taking power from the energy storage module 102. The input end of the second power extraction circuit 112 is connected to the support capacitor of the power module 101, and the output end of the second power extraction circuit 112 is connected to the second bypass drive circuit 115, which is used to supply redundant power to the second bypass drive circuit 115 after taking power from the support capacitor of the power module 101.

[0072] In the embodiment of the present utility model, for each energy storage sub-module 10, each energy storage sub-module 10 may include a redundant power supply module 104. Here, when the energy storage sub-module 10 is in a normal working state and the first power extraction circuit 111 is normal, the first power extraction circuit 111 can supply power to the control circuit 113 and the first bypass drive circuit 114; when the first power extraction circuit 111 has an abnormality, the second power extraction circuit 112 can supply redundant power to the second bypass drive circuit 115 at this time, thereby improving the reliability of the energy storage sub-module 10 and further improving the safety of the energy storage sub-module 10.

[0073] In the embodiment of the present utility model, the first power extraction circuit 111 may be referred to as the "main power supply", and the second power extraction circuit 112 may be referred to as the "redundant power supply".

[0074] That is to say, in the embodiment of the present utility model, the first energy extraction circuit 111 and the second energy extraction circuit 112 adopt different configuration methods and energy sources, so that the power supply sources of the first bypass drive circuit 114 and the second bypass drive circuit 115 are different, realizing the redundant power supply design of the bypass drive circuit. Moreover, the number of power supply loads of the second energy extraction circuit 112 is less than that of the first energy extraction circuit 111. For example, the second energy extraction circuit 112 only supplies power to the second bypass drive circuit, and the power supply load is single, so that the design of the second energy extraction circuit 112 can be simplified, the cost can be reduced, and its economy can be improved. In addition, by using the first energy extraction circuit 111 and the second energy extraction circuit 112 for redundant power supply, the safety and reliability of the energy storage sub-module 10 can also be improved.

[0075] In the embodiment of the present utility model, the control circuit 113 is connected to the power module 101 and is used to detect the voltage and current of the power module 101, so as to realize various control and protection functions of the power module, such as current control, temperature control, overcurrent protection, over-temperature protection, etc.

[0076] In the embodiment of the present utility model, the input end of the second energy extraction circuit 112 is connected to the support capacitor of the power module 101, so that the second energy extraction circuit 112 draws power from the support capacitor. Since the capacitor voltage will change suddenly due to the start-up condition and the running condition, the voltage range of the support capacitor is relatively high, so the input voltage range of the second energy extraction circuit 112 is relatively high. The first energy extraction circuit 111 draws power from the energy storage module 102. Since the voltage of the energy storage module 102 is relatively stable and the voltage range of the energy storage module 102 is relatively low, the input voltage range of the first energy extraction circuit 111 is relatively low. That is to say, the voltage range of the support capacitor is higher than that of the energy storage module 102, so that the input voltage range of the first energy extraction circuit 111 is lower than that of the second energy extraction circuit 112.

[0077] In the embodiment of the present utility model, since the first energy extraction circuit 111 supplies power to the control circuit 113 and the first bypass drive circuit 114, and the second energy extraction circuit 112 only supplies power to the second bypass drive circuit 115, that is, the number of power supply loads of the first energy extraction circuit 111 is more than that of the second energy extraction circuit 112. That is, the first energy extraction circuit 111 needs to perform multiple outputs, so that the output power of the first energy extraction circuit 111 is higher. Therefore, the output power of the first energy extraction circuit 111 is higher than that of the second energy extraction circuit 112.

[0078] Thus, in the embodiment of the present utility model, since the energy source of the first energy extraction circuit 111 is the energy storage module 102 and the energy source of the second energy extraction circuit 112 is the support capacitor of the power module 101, the voltage range of the support capacitor is higher than that of the energy storage capacitor, so that the input voltage range of the first energy extraction circuit 111 is lower than that of the second energy extraction circuit 112; moreover, the first energy extraction circuit 111 can supply power to more circuits (such as the control circuit) than the second energy extraction circuit 112. By setting the output power of the first energy extraction circuit 111 to be higher than that of the second energy extraction circuit 112, that is, by simplifying the design of the second energy extraction circuit 112, the cost can be reduced and the economy of redundant power supply can be ensured.

[0079] In addition, since the first energy extraction circuit 111 needs to supply power to all functions of the energy storage sub-module 10 to support all functions of the energy storage sub-module 10, the first energy extraction circuit 111 requires multiple outputs with different voltage and current levels, and insulation design needs to be done between different outputs to ensure the reliability of the energy storage sub-module 10. In addition, the second energy extraction circuit 112 only supplies redundant power to the second bypass drive circuit 115, that is, the second energy extraction circuit 112 has a single output with a single voltage and current level, thus simplifying the design of the second energy extraction circuit 112 and further reducing the cost.

[0080] It can be understood that in the embodiment of the present utility model, the first energy extraction circuit 111 draws power from the energy storage module 102 and uses the first energy extraction circuit 111 as the main output power source, so that the input voltage of the first energy extraction circuit 111 is lower and the insulation cost is lower; the second energy extraction circuit 112 draws power from the support capacitor, the input voltage range of the second energy extraction circuit is higher, and it only supplies power to the second bypass drive circuit 115. Moreover, the second energy extraction circuit 112 has only a single output, with less power consumption, which can reduce the cost of redundant power supply and further improve the economy of the energy storage sub-module.

[0081] In some embodiments, based on the Figure 2 shown energy storage sub-module 10, referring to Figure 3 , the power module 101 includes a power unit 301, a bypass switch K, and a support capacitor C. Among them, the support capacitor C is connected in parallel at the output end of the power unit 301, and the output end of the power unit 301 is connected to the energy storage module 102; the bypass switch K is connected in parallel at the input end of the power unit 301, and the control end of the bypass switch K is respectively connected to the output ends of the first bypass drive circuit 114 and the second bypass drive circuit 115.

[0082] In the embodiment of the present utility model, the bypass switch K is connected in parallel to the input end of the power unit 301 and is used to bypass the power module 101 when an abnormality occurs in the power module 101. The control ends of the bypass switch K are respectively connected to the output ends of the first bypass driving circuit 114 and the second bypass driving circuit 115. When an abnormality occurs in the power module 101, the bypass switch K can be controlled to close through the first bypass driving circuit 114 or the second bypass driving circuit 115 to bypass the power module 101, avoid the expansion of the fault, maintain the continuous operation of the energy storage sub-module 10, and thus improve the reliability of the energy storage sub-module. Here, the bypass switch K is a type of protective device, which mainly bypasses the power module 101 by closing the bypass switch when a fault occurs in the power module 101 and cannot be used as a conventional current-carrying path.

[0083] In this way, in the embodiment of the present utility model, for the power module 101, the support capacitor C is connected in parallel to the output end of the power unit 301, and the output end of the power unit 301 is connected to the energy storage module 102. Electric energy conversion can be performed through the power unit 301, and the electric energy can be stored in the support capacitor C and the energy storage module 102. In addition, the control ends of the bypass switch K are respectively connected to the output ends of the first bypass driving circuit 114 and the second bypass driving circuit 115. In this way, when an abnormality occurs in the power module 101, the bypass switch K can also be controlled to close through the first bypass driving circuit 114 and the second bypass driving circuit 115 to bypass the power module 101, thereby improving the reliability of the energy storage sub-module 10.

[0084] In this way, by setting the first bypass driving circuit 114 and the second bypass driving circuit 115, and connecting the power supply end of the first bypass driving circuit 114 to the first energy extraction circuit 111 and the power supply end of the second bypass driving circuit 115 to the second energy extraction circuit 112, different power supply methods are adopted for the first bypass driving circuit 114 and the second bypass driving circuit 115, so as to realize redundant power supply for the bypass driving circuit; and since the output ends of the first bypass driving circuit 114 and the second bypass driving circuit 115 are respectively connected to the control end of the bypass switch K, the closing state of the bypass switch K can be quickly controlled through the first bypass driving circuit 114 or the second bypass driving circuit 115 after a fault occurs in the power module 101, avoiding the expansion of the fault and even causing economic losses; moreover, this redundant power supply method can reduce costs and improve reliability.

[0085] In some embodiments, the control circuit 113 may include a first voltage sampling unit and a bypass driving control unit. The input end of the first voltage sampling unit is connected to the output end of the power unit 301; the input end of the bypass driving control unit is connected to the output end of the first voltage sampling unit, and the output end of the bypass driving control unit is connected to the input end of the first bypass driving circuit 114.

[0086] In the embodiment of the present invention, the first voltage sampling unit is connected to the output end of the power unit 301 and is used to collect the working state of the power unit (such as the output voltage); the output end of the bypass driving control unit is connected to the input end of the first bypass driving circuit 114 and is used to generate a first bypass signal and send the first bypass signal to the first bypass driving circuit 114 when it is determined that the power module 101 is abnormal according to the working state collected by the first voltage sampling unit.

[0087] In this way, in the embodiment of the present invention, since the input end of the first voltage sampling unit is connected to the output end of the power unit 301, the working state of the power module 101 can be detected. When the power module 101 fails, the bypass driving control unit can send a first bypass signal to the first bypass driving circuit 114, so that the first bypass driving circuit 114 controls the bypass switch to close, thereby avoiding the expansion of the fault and even causing economic losses, and improving the safety and reliability of the energy storage sub-module 10.

[0088] In some embodiments, as Figure 4 shown, the first bypass driving circuit 114 may include a first bypass triggering unit 401 and a first communication unit 402. The input end of the first communication unit 402 is connected to the output end of the bypass driving control unit; the output end of the first communication unit 402 is connected to the input end of the first bypass triggering unit 401, and the output end of the first bypass triggering unit is connected to the control end of the bypass switch K.

[0089] In the embodiment of the present invention, the input end of the first communication unit 402 is connected to the output end of the bypass driving control unit and is used to receive the first bypass signal sent by the bypass driving control unit in the control circuit 113 when the control circuit 113 detects that the power module 101 is abnormal; the output end of the first communication unit 402 is connected to the input end of the first bypass triggering unit 401 and is used to send the first bypass signal to the first bypass triggering unit 401, so that the first bypass triggering unit 401 controls the bypass switch K to close according to the first bypass signal to bypass the power module.

[0090] In this way, when the first voltage sampling unit in the control circuit 113 detects an abnormality in the power module 101, the first communication unit 402 receives the first bypass signal sent by the bypass drive control unit in the control circuit 113, so that the first bypass trigger unit controls the bypass switch K to close according to the first bypass signal to bypass the power module 101, thereby improving the reliability and safety of the energy storage sub-module 10.

[0091] In some embodiments, continuing as Figure 4 shown, the first bypass drive circuit 114 may further include: a first bypass switch power supply unit 403, a first bypass switch status detection unit 404, and a first power input and conversion unit 405.

[0092] In the embodiments of the present invention, the output end of the first bypass switch power supply unit 403 is connected to the power supply end of the bypass switch K, and the input end of the first bypass switch power supply unit 403 is connected to the first power input and conversion unit 405 for supplying power to the bypass switch K; the first bypass switch status detection unit 404 is connected to the bypass switch K for detecting the status of the bypass switch K; the first power input and conversion unit 405 is connected to the output end of the first energy extraction circuit 111 for converting the output voltage of the first energy extraction circuit 111 into the voltages required by each circuit and device to supply power to each circuit and device, such as supplying power to the first bypass drive circuit 114 and the bypass switch K, etc.

[0093] In some embodiments, as Figure 5 shown, the second bypass drive circuit 115 may include a second bypass trigger unit 501 and a fault detection unit 502.

[0094] In the embodiments of the present invention, the input end of the fault detection unit 502 is connected to the output end of the power unit 301, the output end of the fault detection unit 502 is connected to the input end of the second bypass trigger unit 501, and the second bypass trigger unit 501 is connected to the control end of the bypass switch K.

[0095] In the embodiments of the utility model, the input end of the fault detection unit 502 is connected to the output end of the power unit 301 for generating a second bypass signal when the first energy extraction circuit 111 has an abnormality and the power module 101 is detected to have an abnormality. The output end of the fault detection unit 502 is connected to the input end of the second bypass trigger unit 501 for sending the second bypass signal to the second bypass trigger unit 501, so that the second bypass trigger unit 501 triggers the bypass switch K to close according to the second bypass signal to bypass the power module 101. Here, both the first bypass signal and the second bypass signal are used to indicate controlling the closing of the bypass switch K to bypass the power module 101.

[0096] In the embodiments of the present utility model, there may be various reasons for the abnormality of the first energy extraction circuit 111. For example, insulation failure, electromagnetic interference failure, heat dissipation failure, short - circuit failure, line aging failure, and failure of internal devices affected by cosmic rays, etc. Exemplarily, when the first energy extraction circuit 111 is abnormal, at this time, the second energy extraction circuit 112 can supply redundant power to the second bypass drive circuit 115; when the fault detection unit 502 detects an abnormality in the power module 101, the second bypass trigger unit 601 is triggered to close the bypass switch K.

[0097] Thus, when the first energy extraction circuit 111 is abnormal, at this time, the second energy extraction circuit 112 can make the second bypass drive circuit 115 enter the working state; in this way, when the fault detection unit 502 detects an abnormality in the power module 101, the bypass switch K can also be triggered to close through the second bypass trigger unit 501, thereby improving the safety and reliability of the energy storage sub - module 10.

[0098] In some embodiments, the fault detection unit 502 may include a second voltage sampling unit, where: the input end of the second voltage sampling unit is connected to the output end of the power unit, and is used to collect the output voltage of the power unit.

[0099] In the embodiments of the present utility model, the second voltage sampling unit 502 may be an over - voltage detection circuit. After the over - voltage detection circuit detects that the output voltage of the power module 101 is over - voltage, the bypass switch K is closed through the second bypass trigger unit 501. Here, the second voltage sampling unit 502 may also be a zener diode, a thyristor crowbar circuit, a reverse - breakdown diode, etc., and no specific limitation is made in this regard.

[0100] In this way, when the first energy extraction circuit 111 is abnormal, at this time, the second energy extraction circuit 112 can make the second bypass drive circuit 115 enter the working state; in this way, when the output voltage of the power module 101 collected by the second voltage sampling unit in the fault detection unit 502 is abnormal, the bypass switch K can be triggered to close through the second bypass trigger unit 501, thereby improving the safety and reliability of the energy storage sub - module 10.

[0101] In some embodiments, continuing as Figure 5 shown, the second bypass drive circuit 115 may further include a second bypass switch power supply unit 503, a second bypass switch state detection unit 504, and a second power input and conversion unit 505.

[0102] In the embodiment of the present utility model, the output end of the second bypass switch power supply unit 503 is connected to the power supply end of the bypass switch K, and the input end of the second bypass switch power supply unit 503 is connected to the second power input and conversion unit 505 for supplying power to the bypass switch K; the second bypass switch state detection unit 504 is connected to the bypass switch K for detecting whether the bypass switch K is successfully closed when bypassing the power module 101; the second power input and conversion unit 505 is connected to the output end of the second energy extraction circuit 112 for converting the output voltage of the second energy extraction circuit 112 into the voltages required by each circuit and device to supply power to each circuit and device, such as supplying power to the second bypass drive circuit 115 and the bypass switch K, etc.

[0103] In the embodiment of the present utility model, the second bypass drive circuit 115 does not require a Central Processing Unit (CPU), an optoelectronic conversion module, and a communication function module. Therefore, the loss of the second bypass drive circuit 115 is extremely small, which can reduce the cost of redundant power supply and thus improve the economy of the energy storage sub-module.

[0104] In some embodiments, the power supply priority of the first energy extraction circuit 111 is higher than that of the second energy extraction circuit 112. Among them, when the first energy extraction circuit 111 is normal, the first bypass drive circuit 114 is used to control the opening and closing state of the bypass switch K; when the first energy extraction circuit 111 is abnormal, the second bypass drive circuit 115 is used to control the opening and closing state of the bypass switch K.

[0105] In the embodiment of the present utility model, when the first energy extraction circuit 111 is normal, the first bypass drive circuit 114 controls the closing state of the bypass switch; when the first energy extraction circuit 111 is abnormal, the second bypass drive circuit 115 controls the switching state of the bypass switch. In this way, the first energy extraction circuit 111 and the second energy extraction circuit 112 are used for redundant power supply. When the first energy extraction circuit 111 is abnormal and the power module 101 has an abnormality, the closing state of the bypass switch can be controlled by the second bypass drive circuit 115 to bypass the power module 101, which can improve the safety and reliability of the energy storage sub-module 10.

[0106] In another embodiment of the present utility model, the power unit 301 may include a half-bridge circuit composed of two power devices, and / or a full-bridge circuit composed of four power devices.

[0107] That is to say, the power unit 301 may include a half-bridge circuit composed of two power devices, or a full-bridge circuit composed of four power devices, or a combination of a half-bridge circuit composed of two power devices and a full-bridge circuit composed of four power devices, without any limitation here. Here, when the power unit adopts a half-bridge circuit, since only two power devices are used, the device cost can also be reduced.

[0108] In the embodiments of the present invention, the power device may be a switching tube, a triode, a transistor, an Insulated-Gate Bipolar Transistor (IGBT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET or MOS tube), etc., without any limitation here.

[0109] In addition, in the embodiments of the present invention, the power unit 301 here is not limited to the half-bridge circuit and full-bridge circuit composed of power devices, and may also be an H-bridge circuit, a push-pull circuit, a full-bridge half-bridge hybrid circuit, etc. composed of power devices, without any limitation here.

[0110] In some embodiments, based on the Figure 3 shown energy storage sub-module 10, participating in Figure 6 , the power module 101 may further include a first power device T1 and a second power device T2, and the redundant power supply module 104 may further include a first power drive circuit 601 and a second power drive circuit 602.

[0111] In the embodiments of the present invention, the power unit 301 is a half-bridge circuit composed of a first power device T1 and a second power device T2. The power unit 301 adopts a half-bridge circuit and only uses two power devices, which can reduce costs.

[0112] In the embodiments of the present invention, the output end of the first power drive circuit 601 is connected to the control end of the first power device T1 to control the conduction or cutoff of the first power device T1; the output end of the second power drive circuit 602 is connected to the control end of the second power device T2 to control the conduction or cutoff of the second power device T2.

[0113] In addition, in the embodiments of the present invention, the input ends of the first power drive circuit 601 and the second power drive circuit 602 are both connected to the control circuit 113. Through the coordinated operation among the first power drive circuit 601, the second power drive circuit 602, and the control circuit 113, the first power device T1 and the second power device T2 can work efficiently.

[0114] In the embodiment of the present utility model, as Figure 6 shown, the power module 101 further includes a first diode D1 and a second diode D2. Among them, the first diode D1 is connected in parallel between the first end and the second end of the first power device T1, and the second diode D2 is connected in parallel between the first end and the second end of the second power device T2.

[0115] It should be noted that whether it is the first diode D1 or the second diode D2, for these two diodes, they can be integrated inside the corresponding power device, that is, they are the body diodes of the corresponding power device; or they can be separately arranged from the corresponding power device, that is, they are independent components, and no limitation is made here.

[0116] In this way, in the embodiment of the present utility model, the first power driving circuit 601 is used to control the conduction or cut-off of the first power device T1, and the second power driving circuit 602 is used to control the conduction or cut-off of the second power device T2, so as to realize the electric energy conversion of the power module 101. Furthermore, the energy storage sub-module 10 can be used to supply power to the first energy extraction circuit 111, and the support capacitor C can be used to supply power to the second energy extraction circuit 112. In this way, without reducing the reliability of the energy storage sub-module 10, the economy of redundant power supply can be improved.

[0117] In some embodiments, the control circuit 113 may further include a power driving control unit, where: the output end of the power driving control unit is connected to the input ends of the first power driving circuit 601 and the second power driving circuit 602, and is used to generate a first control signal and a second control signal according to the output voltage collected by the first voltage sampling unit, and send the first control signal to the first power driving circuit 601, and send the second control signal to the second power driving circuit 602, so that the first power driving circuit 601 controls the conduction or cut-off of the first power device T1, and the second power driving circuit 602 controls the conduction or cut-off of the second power device T2.

[0118] That is to say, based on the first voltage sampling unit and the power driving control unit in the control circuit 113, the electric energy conversion of the power module 101 can be realized. Furthermore, the energy storage sub-module 10 can be used to supply power to the first energy extraction circuit 111, and the support capacitor C can be used to supply power to the second energy extraction circuit 112. In this way, without reducing the reliability and safety of the energy storage sub-module 10, the economy of redundant power supply can be improved.

[0119] In the embodiment of the present utility model, the control circuit 113 further includes a second communication unit. The input end of the second communication unit is connected to the control circuit 113 and is used for the communication between the control circuit 113 and other modules. Exemplarily, when the control circuit 113 detects a fault in the power module 101, it sends a first bypass signal to the first bypass driving circuit 114 through the second communication unit.

[0120] The embodiment of the present utility model provides an energy storage sub-module, which includes an energy storage module and a redundant power supply module. The redundant power supply module includes a first power taking circuit, a second power taking circuit, a control circuit, a first bypass driving circuit and a second bypass driving circuit. Among them, the first power taking circuit takes power from the energy storage module and supplies power to the control circuit and the first bypass driving circuit; the second power taking circuit takes power from the support capacitor and supplies redundant power to the second bypass driving circuit. In this way, the first power taking circuit and the second power taking circuit adopt different configuration methods and energy sources, so that the power supply sources of the first bypass driving circuit and the second bypass driving circuit are different, realizing the redundant power supply design of the bypass driving circuit. Moreover, the number of power supply loads of the second power taking circuit is less than that of the first power taking circuit. For example, the second power taking circuit only supplies power to the second bypass driving circuit, and the power supply load is single, so the design of the second power taking circuit can be simplified, the cost can be reduced, and its economy can be improved; in addition, the first power taking circuit and the second power taking circuit are used for redundant power supply, thereby improving the reliability of the energy storage sub-module and further improving the safety of the energy storage system.

[0121] In another embodiment of the present utility model, Figure 7 is a detailed composition schematic diagram of an energy storage sub-module provided by the embodiment of the present utility model. As Figure 7 shown, the energy storage sub-module 10 may include a primary circuit 71 and a secondary circuit 72. Here, the primary circuit 71 may refer to the main circuit, and the secondary circuit 72 may be the redundant power supply module in the above embodiment. The secondary circuit 71 may also be referred to as the control system.

[0122] In the embodiment of the present utility model, as Figure 7As shown in the figure, the primary circuit 71 may include a power module 101 and an energy storage module 102; the power module 101 may include a first power device T1, a second power device T2, a first diode D1, a second diode D2, a bypass switch K, a support capacitor C, and a voltage equalizing resistor R; the energy storage module 102 may include a battery BT. Among them, the first power device T1, the second power device T2, the first diode D1, and the second diode D2 form a power unit. It should be noted that the first diode D1 may be integrated inside the first power device T1, or the first diode D1 and the first power device T1 may be two separate devices; similarly, the second diode D2 may be integrated inside the second power device T2, or the second diode D2 and the second power device T2 may be two separate devices.

[0123] In the embodiment of the present invention, the positive input terminal (+) of the power module 101 is respectively connected to the first end of the bypass switch K, the first end of the second power device T2, and the second end of the first power device T1; the negative input terminal (-) of the power module 101 is respectively connected to the second end of the bypass switch K and the second end of the second power device T2; the first end of the first power device T1 is respectively connected to the positive terminal (+) of the battery BT, the first end of the support capacitor C, and the first end of the voltage equalizing resistor R, and the second end of the second power device T2 is respectively connected to the negative terminal (-) of the battery BT, the second end of the support capacitor C, and the second end of the voltage equalizing resistor R.

[0124] In the embodiment of the present invention, as Figure 7 shown, the secondary circuit 72 may include a main power supply 721, a redundant power supply 722, a control circuit 113, a first bypass drive circuit 114, and a second bypass drive circuit 115.

[0125] In the embodiment of the present invention, the main power supply 721 is connected to the battery BT for taking power from the battery BT; the main power supply 721 is respectively connected to the control circuit 113 and the first bypass drive circuit 114 for supplying power to the control circuit 113 and the first bypass drive circuit 114; the redundant power supply 722 is respectively connected to the first end and the second end of the support capacitor C for taking power from the support capacitor C; the redundant power supply 722 is connected to the second bypass drive circuit 115 for supplying power to the second bypass drive circuit 115.

[0126] In the embodiment of the present invention, the second bypass drive circuit 115 is connected to the first end of the first power device T1 for realizing the output detection of the power module 101. Exemplarily, the second bypass drive circuit 115 is connected to the first end of the first power device T1 by a voltage sampling line for detecting whether the output of the power module 101 is overvoltage.

[0127] In the embodiment of the present utility model, the control circuit 113 is connected to the positive input terminal (+) and the negative input terminal (-) of the power module 101, and is used to implement the input detection of the power module 101. The control circuit 113 is connected to the first end of the first power device T1 and the second end of the second power device T2, and is used to implement the output detection of the power module 101. The control circuit 113 is connected to the first power driving circuit 601, and is used to control the conduction and cutoff of the first power device T1; the control circuit 113 is connected to the second power driving circuit 602, and is used to control the conduction and cutoff of the second power device T2.

[0128] In the embodiment of the present utility model, the main power supply 721 is the first energy extraction circuit in the foregoing embodiment. The energy source of the main power supply 721 is powered by the battery BT, and is used to supply power to the control circuit 113 and the first bypass driving circuit 114. The main power supply 721 can meet the long-term operation requirements of the secondary circuit of the power module; the redundant power supply 722 is the second energy extraction circuit in the foregoing embodiment. The energy source of the redundant power supply 722 is powered by the support capacitor C. The redundant power supply 722 is a low-power simplified power supply, and can only meet part of the power supply requirements of the power module 101, that is, it is used to supply redundant power to the second bypass driving circuit 115.

[0129] It should be noted that the redundant power supply 722 only supplies power to the second bypass driving circuit 115. Considering safety, the non-operation of the remaining modules does not affect safety. Specifically, after the main power supply 721 is abnormal, if the second bypass driving circuit 115 detects that the output voltage of the power module is overvoltage, the second bypass driving circuit 115 can also drive the bypass switch K to close, thereby ensuring the safety and reliability of the energy storage sub-module 10.

[0130] In the embodiment of the present utility model, the input voltage range of the main power supply 721 is lower than the input voltage range of the redundant power supply 722, and the output power of the main power supply 721 is higher than the output power of the redundant power supply 722. Since the redundant power supply 722 only needs to supply power to the second bypass driving circuit 115 and does not need to supply power to the control circuit 113, the first bypass driving circuit 114, etc., the load structure of the redundant power supply 722 is simple and the output power requirement is low. Therefore, the power supply structure of the redundant power supply 722 can be very simple, which can reduce the cost of the energy storage sub-module.

[0131] In the embodiment of the present utility model, the secondary circuit 72 may further include a first power driving circuit 601 and a second power driving circuit 602. Among them, the control circuit 113 is respectively connected to the first power driving circuit 601 and the second power driving circuit 602, and the first power driving circuit 601 and the second power driving circuit 602 are powered by the power supply unit in the control circuit 113.

[0132] In the embodiment of the present utility model, the control circuit 113 may include a first voltage sampling unit, a power drive control unit, a bypass drive control unit, and a second communication unit. Therefore, the power consumption required by the control circuit 113 is relatively large. Among them, the first voltage sampling unit is connected to the output end of the power unit 301 for collecting the output voltage of the power unit 301; the power drive control unit is configured to generate a first control signal and a second control signal according to the output voltage collected by the first voltage sampling unit, and send the first control signal to the first power drive circuit 601 and send the second control signal to the second power drive circuit 602; the bypass drive control unit is configured to generate a first bypass signal when it is determined that the power module 101 is abnormal according to the output voltage collected by the first voltage sampling unit, and send the first bypass signal to the first bypass drive circuit 114; the input end of the second communication unit is connected to the control circuit 113 for communication between the control circuit 113 and other modules.

[0133] Exemplarily, if the first power device T1 is an IGBT device, then the first power drive circuit 601 may be an IGBT drive board; similarly, if the second power device T2 is also an IGBT device, then the second power drive circuit 602 may also be an IGBT drive board. There is no limitation here.

[0134] In the embodiment of the present utility model, the first bypass drive circuit 114 may include a first bypass trigger unit and a first communication unit. Among them, the first communication unit is connected to the control circuit 113 for receiving the first bypass signal sent by the control circuit 113 when the control circuit 113 detects that the power module 101 is abnormal; the first bypass trigger unit is connected to the bypass switch K for triggering the bypass switch K to close according to the first bypass signal to bypass the power module 101.

[0135] In the embodiment of the present utility model, as Figure 5 shown, the second bypass drive circuit 115 may include a second bypass trigger unit 501, a fault detection unit 502, a second bypass switch power supply unit 503, a second bypass switch status detection unit 504, and a second power input and conversion unit 505. When the second bypass drive circuit 115 detects that the main power supply 721 fails and detects overvoltage of the energy storage sub-module 10, the second bypass trigger unit 501 is automatically triggered to close the bypass switch K. It can be seen that the load of the second bypass drive circuit 115 does not require a CPU, an optoelectronic conversion module, and a communication function. Therefore, the loss of the second bypass drive circuit 115 is extremely small, usually within 5W, which can reduce the cost of redundant power supply.

[0136] In the embodiment of the present utility model, Figure 7The detailed composition of the energy storage sub-module shown can also be referred to as the power supply and control system architecture of the energy storage valve sub-module, or can also be referred to as the secondary control architecture. Here, the secondary circuit 72 can be a secondary board. Among them, the control circuit 113, the first power drive circuit 601, the second power drive circuit 602, the first bypass drive circuit 114, the second bypass drive circuit 115, etc. in the secondary circuit 72 can also exist in the form of boards.

[0137] The embodiment of the present utility model provides an energy storage sub-module. Through the specific elaboration of the foregoing embodiments in the above embodiments, it can be seen that the secondary circuit in this energy storage sub-module can redundantly supply power to the power module in the energy storage sub-module; this secondary circuit includes a main power supply and a simplified redundant power supply, and the main power supply and the redundant power supply adopt different functional configurations and energy sources. Without reducing the safety of the energy storage sub-module, the cost can be reduced, and the economy of redundant power supply can be ensured; in addition, by configuring the redundant power supply, the reliability and safety of the energy storage sub-module are improved.

[0138] In an embodiment of the present utility model, Figure 8 is a schematic diagram of the composition structure of an energy storage system provided by an embodiment of the present utility model. As Figure 8 shown, the energy storage system 80 may include at least one energy storage sub-module.

[0139] In the embodiment of the present utility model, the energy storage system 80 can be a DC direct-connected energy storage valve. Among them, at least one energy storage sub-module in the energy storage system 80 is a cascaded structure. Here, the energy storage sub-module can also be referred to as an "energy storage valve sub-module" or an "energy storage sub-module".

[0140] In the embodiment of the present utility model, as Figure 8 shown, assuming that the energy storage system 80 may include k energy storage sub-modules (energy storage sub-module 1, energy storage sub-module 2,..., energy storage sub-module k), these k energy storage sub-modules are usually stacked to be integrated into an overall structure of a high-voltage energy storage system. Where k is a positive integer.

[0141] In some embodiments, each energy storage sub-module in the energy storage system 80 can be the energy storage sub-module described in any one of the above embodiments.

[0142] The present utility model provides an energy storage system, which includes at least one energy storage module, and each energy storage sub-module includes an energy storage module and a redundant power supply module. The redundant power supply module includes a first power extraction circuit, a second power extraction circuit, a control circuit, a first bypass drive circuit, and a second bypass drive circuit. Among them, after the first power extraction circuit extracts power from the energy storage module, it supplies power to the control circuit and the first bypass drive circuit; after the second power extraction circuit extracts power from the power supply interface, it supplies redundant power to the second bypass drive circuit. In this way, the first power extraction circuit and the second power extraction circuit adopt different configuration methods and energy sources, so that the power supply sources of the first bypass drive circuit and the second bypass drive circuit are different, realizing the redundant power supply design of the bypass drive circuit. Moreover, the number of power supply loads of the second power extraction circuit is less than that of the first power extraction circuit. For example, the second power extraction circuit only supplies power to the second bypass drive circuit, and the power supply load is single, so the design of the second power extraction circuit can be simplified, the cost can be reduced, and its economy can be improved. In addition, when the first power extraction circuit is normal, the first power extraction circuit is used to supply redundant power to the first bypass drive circuit and the second power extraction circuit. When the first power extraction circuit is abnormal, the second power extraction circuit is used to supply power to the second bypass drive circuit, thereby improving the safety and reliability of the energy storage sub-module.

[0143] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present utility model, the magnitude of the serial numbers of the above steps / processes does not mean the sequence of execution. The execution sequence of each step / process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present disclosure. The serial numbers of the embodiments of the present disclosure above are only for description and do not represent the advantages and disadvantages of the embodiments.

[0144] It should be noted that in the present utility model, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0145] In several embodiments provided by the present utility model, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces. The indirect coupling or communication connection of devices or units can be electrical, mechanical, or other forms.

[0146] The units described above as separate components may or may not be physically separated. The components shown as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in each embodiment of the present utility model, the various functional units can all be integrated in one processing unit, or each unit can be separately used as a unit, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0147] The above is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An energy storage submodule, characterized in that: The energy storage submodule includes an energy storage module and a redundant power supply module, and the redundant power supply module includes a first energy acquisition circuit, a second energy acquisition circuit, a control circuit, a first bypass drive circuit and a second bypass drive circuit; wherein: The input end of the first energy extraction circuit is connected to the energy storage module, and the output end of the first energy extraction circuit is connected to the control circuit and the first bypass drive circuit respectively; The input end of the second energy extraction circuit is connected to the power supply interface, and the output end of the second energy extraction circuit is connected to the second bypass drive circuit; Among them, the number of loads powered by the first energy acquisition circuit is greater than the number of loads powered by the second energy acquisition circuit.

2. The energy storage submodule according to claim 1, characterized in that: The power supply interface is connected to other energy storage submodules in the energy storage system; or, The power supply interface is connected to an external power source.

3. The energy storage submodule according to claim 1, characterized in that: The energy storage submodule further includes a power module, and the power module includes a support capacitor, wherein: The power supply interface is connected to the supporting capacitor in the power module.

4. The energy storage submodule according to claim 3, characterized in that: The power module further comprises a power unit and a bypass switch, wherein: The support capacitor is connected in parallel to the output end of the power unit, and the output end of the power unit is connected to the energy storage module; The bypass switch is connected in parallel to the input end of the power unit, and the control end of the bypass switch is connected to the output end of the first bypass driving circuit and the output end of the second bypass driving circuit respectively.

5. The energy storage submodule according to claim 4, characterized in that: The second bypass driving circuit includes a second bypass triggering unit and a fault detection unit, wherein: The input end of the fault detection unit is connected to the output end of the power unit; The output end of the fault detection unit is connected to the input end of the second bypass trigger unit, and the output end of the second bypass trigger unit is connected to the control end of the bypass switch.

6. The energy storage submodule according to claim 5, characterized in that: The fault detection unit comprises a second voltage sampling unit, wherein: The input end of the second voltage sampling unit is connected to the output end of the power unit and is used to collect the output voltage of the power unit.

7. The energy storage submodule according to claim 5, characterized in that: The second bypass driving circuit further includes a second bypass switch detection unit, wherein: The second bypass switch detection unit is connected to the bypass switch, and is used to detect whether the bypass switch is successfully closed when bypassing the power module.

8. The energy storage submodule according to claim 4, characterized in that: The control circuit includes a first voltage sampling unit and a bypass drive control unit, and the first bypass drive circuit includes a first bypass trigger unit and a first communication unit; wherein: The input end of the first voltage sampling unit is connected to the output end of the power unit; The input end of the bypass drive control unit is connected to the output end of the first voltage sampling unit, and the output end of the bypass drive control unit is connected to the input end of the first communication unit; The output end of the first communication unit is connected to the input end of the first bypass trigger unit, and the output end of the first bypass trigger unit is connected to the control end of the bypass switch.

9. The energy storage submodule according to any one of claims 1 to 8, characterized in that: The power supply priority of the first energy acquisition circuit is higher than the power supply priority of the second energy acquisition circuit, wherein: When there is no abnormality in the first energy taking circuit, the first bypass driving circuit is used to control the on / off state of the bypass switch; When an abnormality occurs in the first energy extraction circuit, the second bypass driving circuit is used to control the on / off state of the bypass switch.

10. An energy storage system, characterized in that: The energy storage system comprises at least one energy storage submodule according to any one of claims 1 to 9.

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