Power supply device, container power supply and energy storage system

Abstract

The utility model discloses a power supply device, a container power supply and an energy storage system. The power supply device comprises a first energy taking circuit, a second energy taking circuit, a power supply management circuit and a battery management unit. The input end of the first energy taking circuit is connected with the first battery box, and the first energy taking circuit is configured to provide a first power supply for the power management circuit after taking electricity from the first battery box; the input end of the second energy taking circuit is connected with the second battery box, and the second energy taking circuit is configured to provide a second power supply for the power management circuit after taking electricity from the second battery box; and the power supply management circuit is configured to control the first power supply provided by the first energy taking circuit and the second power supply provided by the second energy taking circuit to compete for power supply so as to supply power to the battery management unit. Thus, the first energy taking circuit and the second energy taking circuit are used for competitive power supply, the working state of the battery management unit can be maintained, and the safety and reliability of the energy storage system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a power supply device, a container power supply and an energy storage system. Background Art

[0002] With the development of smart grids, energy storage technology has become an important part of its development process. Among various energy storage technologies, container-type energy storage systems have the advantages of mature technology, large capacity, mobility, high reliability, no pollution, low noise, strong adaptability, expandability, and easy installation. Therefore, as the energy storage power supply of the power system, container energy storage systems are the future development direction of energy storage.

[0003] In an energy storage system, the battery management unit is an important component for monitoring the state of the battery to ensure the safety of the energy storage system. However, in related technologies, the power supply scheme for the battery management unit is not comprehensively considered, resulting in a risk of power loss in the battery management unit, which affects the safety of the energy storage system. Summary of the Utility Model

[0004] The utility model provides a power supply device, a container power supply and an energy storage system, which can enable the battery management unit to obtain a stable and reliable power supply, so as to maintain the working state of the battery management unit to the greatest extent, and further improve the safety and reliability of the energy storage system.

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

[0006] In a first aspect, an embodiment of the utility model provides a power supply device, which includes a first power extraction circuit, a second power extraction circuit, a power management circuit and a battery management unit; wherein:

[0007] The input end of the first power extraction circuit is connected to the first battery box and is configured to supply power from the first battery box and then provide a first power supply to the power management circuit;

[0008] The input end of the second power extraction circuit is connected to the second battery box and is configured to supply power from the first container and then provide a second power supply to the power management circuit;

[0009] The power management circuit is configured to control the first power supply provided by the first power extraction circuit and the second power supply provided by the second power extraction circuit to compete for power supply to supply power to the battery management unit.

[0010] Through the above technical means, the first power-taking circuit is connected to the first battery box. At this time, the first power-taking circuit can obtain power from the first battery box and provide the first power supply to the power management circuit; the second power-taking circuit is connected to the second battery box. At this time, the second power-taking circuit can obtain power from the second battery box and provide the second power supply to the power management circuit; the power management circuit controls the first power supply provided by the first power-taking circuit and the second power supply provided by the second power-taking circuit to compete for power supply to supply power to the battery management unit. In this way, using the first power-taking circuit and the second power-taking circuit to compete for power supply to the battery management unit can not only enable the battery management unit to obtain a stable and reliable power supply, maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); but also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0011] In some embodiments, the first battery box is located inside the first container, the second battery box is located inside the second container, and the first container and the second container belong to different containers.

[0012] Through the above technical means, the first battery box and the second battery box are located in different containers. In this way, the power supply source for the battery management unit can be adjusted according to the actual situation of the containers, maintaining the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); but also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0013] In some embodiments, the first power-taking circuit and the second power-taking circuit are located inside the first container; or, the first power-taking circuit is located inside the first container, and the second power-taking circuit is located inside the second container.

[0014] Through the above technical means, both the first power-taking circuit and the second power-taking circuit are arranged in the same container. In this way, the two power-taking circuits are centrally arranged in the same container, which is convenient for unified management and maintenance, can reduce the workload of maintenance personnel, and improve the maintenance efficiency; or, the two power-taking circuits are respectively arranged in two different containers. In this way, when a problem occurs in one container or power-taking circuit, it can be maintained or replaced separately without affecting the normal operation of the other container or power-taking circuit, and the continuity of power supply can be maintained.

[0015] In some embodiments, the power management circuit includes a first management unit and a second management unit; wherein: the first management unit includes a first voltage drop component, and the first management unit is connected between the first power extraction circuit and the battery management unit; the second management unit includes a second voltage drop component, and the second management unit is connected between the second power extraction circuit and the battery management unit.

[0016] By the above technical means, the first management unit includes a first voltage drop component, and the first management unit is connected between the first power extraction circuit and the battery management unit. At this time, the first power supply provided by the first power extraction circuit is stepped down by the first voltage drop component; the second management unit includes a second voltage drop component, and the second management unit is connected between the second power extraction circuit and the battery management unit. At this time, the second power supply provided by the second power extraction circuit is stepped down by the second voltage drop component; thus, the power management circuit can control the first power extraction circuit and the second power extraction circuit to compete for power supply to supply power to the battery management unit, enabling the battery management unit to obtain a stable and reliable power supply, and can maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work.

[0017] In some embodiments, the on-state voltage drop of the first voltage drop component is less than that of the second voltage drop component; the power management circuit is further configured to determine the first power supply provided by the first power extraction circuit as the target power supply when the first power supply provided by the first power extraction circuit and the second power supply provided by the second power extraction circuit compete for power supply, and control the target power supply to supply power to the battery management unit.

[0018] By the above technical means, the on-state voltage drop of the first voltage drop component is less than that of the second voltage drop component. For example, when the first power supply and the second power supply are equal, the power management circuit determines the first power supply provided by the first power extraction circuit as the target power supply to supply power to the battery management unit. In this way, when the first container is in the upper high-voltage state, the first power supply provided by the first power extraction circuit is preferentially used to supply power to the battery management unit, which can reduce the connection and dependency relationships between devices, thereby improving the overall stability and reliability of the system.

[0019] In some embodiments, the first management unit further includes a switch component; wherein: the switch component is configured to be in a closed state when the first container is in the upper high-voltage state; or, to be in an open state when the first container is in the lower high-voltage state and the second power extraction circuit meets a preset condition.

[0020] By means of the above technical means, when the first container is in the upper high-voltage state, the power management circuit keeps the switching component closed, so that the first power supply provided by the first energy extraction circuit and the second power supply provided by the second energy extraction circuit are used for power supply, enabling the battery management unit to obtain a stable and reliable power supply, maintaining the working state of the battery management unit to the greatest extent, and enabling the battery management unit to continuously work; or, when the first container where the first battery box is located is in the lower high-voltage state and the second energy extraction circuit meets the preset conditions, the power management circuit controls the switching component to disconnect, so that the second power supply provided by the second energy extraction circuit supplies power to the battery management unit, avoiding the problem of reduced battery consistency in the battery box when the first container is in the lower high-voltage state, and thus extending the service life of the energy storage system.

[0021] In some embodiments, the second energy extraction circuit meets the preset conditions, including: the second battery box is in a normal state and the power supply duration is greater than or equal to a preset time threshold.

[0022] By means of the above technical means, when the first container where the first battery box is located is in the lower high-voltage state, by judging the state and power supply duration of the second battery box, it is determined whether the second power supply provided by the second energy extraction circuit supplies power to the battery management unit, avoiding the problem of power supply interruption of the battery management unit caused by insufficient power supply capacity of the second energy extraction circuit, and improving the safety and reliability of the system. In addition, by judging the power supply capacity of the second energy extraction circuit, the problem of affecting the service life due to frequent turning off of the switching component in the power management circuit can also be avoided, thereby extending the service life of the switching component.

[0023] In a second aspect, an embodiment of the present invention provides a container, which at least includes a power management circuit, a battery management unit, and a first battery box; wherein:

[0024] The input end of the first energy extraction circuit is connected to the first battery box and is configured to supply power to the power management circuit with the first power supply after taking power from the first battery box;

[0025] The input end of the second energy extraction circuit is connected to the second battery box and is configured to supply power to the power management circuit with the second power supply after taking power from the second battery box;

[0026] The power management circuit is configured to control the first power supply provided by the first energy extraction circuit and the second power supply provided by the second energy extraction circuit to compete for power supply to supply power to the battery management unit.

[0027] Through the above technical means, the first power-taking circuit is connected to the first battery box. At this time, the first power-taking circuit can obtain power from the first battery box and provide the first power supply to the power management circuit; the second power-taking circuit is connected to the second battery box. At this time, the second power-taking circuit can obtain power from the second battery box and provide the second power supply to the power management circuit. The power management circuit uses the first power-taking circuit and the second power-taking circuit to compete for power supply to the battery management unit, which can not only enable the battery management unit to obtain a stable and reliable power supply, but also maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); moreover, it can also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby extending the service life of the energy storage system and improving the safety and reliability of the energy storage system.

[0028] In some embodiments, the second battery box and the container power supply are located in different containers.

[0029] Through the above technical means, the second battery box and the container power supply are located in different containers, that is, the first battery box and the second battery box are located in different containers. The two power-taking circuits obtain power from different containers, so that the power supply source for the battery management unit can be adjusted according to the actual conditions of the two containers, and the working state of the battery management unit can be maintained to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); moreover, it can also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby extending the service life of the energy storage system and improving the safety and reliability of the energy storage system.

[0030] In a third aspect, an embodiment of the present invention provides an energy storage system, which includes at least two container power supplies. The at least two container power supplies include a first container power supply and a second container power supply, and the first container power supply at least includes a power management circuit, a battery management unit and a first battery box, and the second container power supply at least includes a second battery box; wherein:

[0031] The input end of the first power-taking circuit is connected to the first battery box, and is configured to obtain power from the first battery box and provide the first power supply to the power management circuit;

[0032] The input end of the second power-taking circuit is connected to the second battery box, and is configured to obtain power from the second battery box and provide the second power supply to the power management circuit;

[0033] The power management circuit is configured to control the first power supply provided by the first power-taking circuit and the second power supply provided by the second power-taking circuit to compete for power supply to the battery management unit.

[0034] Through the above technical means, the first energy extraction circuit and the second energy extraction circuit compete to supply power to the battery management unit. This can not only enable the battery management unit to obtain a stable and reliable power supply, maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and handling, etc.); but also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby extending the life of the energy storage system and improving the safety and reliability of the energy storage system.

[0035] In some embodiments, the first container power supply, the first energy extraction circuit, and the second energy extraction circuit are all located inside the first container; or, the first container power supply and the first energy extraction circuit are located inside the first container, and the second container power supply and the second energy extraction circuit are located inside the second container.

[0036] Through the above technical means, both the first energy extraction circuit and the second energy extraction circuit are arranged in the same container where the first container power supply is located. In this way, the two energy extraction circuits are concentrated in the same container, which is convenient for unified management and maintenance, can reduce the workload of maintenance personnel, and improve the maintenance efficiency; or, the two energy extraction circuits are respectively arranged in the containers where the two container power supplies are located. In this way, when a problem occurs with one container power supply or energy extraction circuit, it can be maintained or replaced separately without affecting the normal operation of the other container power supply or energy extraction circuit, and the continuity of power supply can be maintained.

[0037] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the composition structure of a power supply device provided by an embodiment of the present invention Figure 1 ;

[0039] Figure 2 Schematic diagram of the composition structure of a power supply device provided by an embodiment of the present invention Figure 2 ;

[0040] Figure 3 Schematic diagram of the detailed composition structure of a power management circuit provided by an embodiment of the present invention;

[0041] Figure 4 Schematic diagram of the composition structure of a container power supply provided by an embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the composition structure of an electrical cabinet provided by an embodiment of the present invention;

[0043] Figure 6 A detailed schematic diagram of a energy storage system provided by an embodiment of the present utility model;

[0044] Figure 7 A detailed structural schematic diagram of a energy storage system provided by an embodiment of the present utility model;

[0045] Figure 8 A detailed structural schematic diagram of an electric cabinet provided by an embodiment of the present utility model;

[0046] Figure 9 A schematic flow chart of a power supply control method provided by an embodiment of the present utility model. Detailed implementation manners

[0047] In order 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 intended to limit the embodiments of the present utility model.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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.

[0049] In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments. It will be understood that "some embodiments" may be the same subset or a different subset of all possible embodiments and may be combined with each other without conflict.

[0050] 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 permitted, so that the embodiments of the present utility model described herein can be implemented in an order other than that illustrated or described herein.

[0051] In addition, reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0052] The related technologies of the present utility model will be introduced below.

[0053] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly applied in the energy storage field and so on.

[0054] At present, new energy batteries are being used more and more widely in life and industry. New energy batteries are not only applied in energy storage power systems such as hydroelectric, thermal, wind, 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.

[0055] In the embodiments of the present utility model, the battery can be a battery cell, or can also be a battery pack (Pack) composed of multiple battery cells. A battery cell refers to a basic unit that can realize the mutual conversion of 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 the embodiments of the present utility model are not limited thereto.

[0056] 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.

[0057] Furthermore, with the development of the smart grid, energy storage technology has become an important link in its development process. Among various energy storage technologies, the container-type energy storage system has the advantages of mature technology, large capacity, movable, high reliability, pollution-free, low noise, strong adaptability, expandable, and easy to install. Therefore, the container energy storage system as the energy storage power source of the power system is the future development direction of energy storage.

[0058] In the related art, redundant power supply design is widely used in the fields of electronic devices and vehicles, but there is a lack of relevant redundant power supply circuit design in the energy storage field. In order to achieve redundant power supply for relevant power sources, although there are already some solutions for the main power source and the redundant power source to compete for power supply to the battery management unit at the same time, these solutions are not comprehensive enough. For example, there is a lack of logical judgment on the power supply duration of the redundant power source of the main control box. In this way, if there is a normal state (able to supply power to the battery management unit) of the redundant power source of the main control box in a short time, but exceeding the preset time threshold, the redundant power source of the main control box is in a fault state, and the battery management unit still has a risk of power failure, reducing the safety of the energy storage system.

[0059] In short, in an energy storage system, the battery management unit is an important component for monitoring the state of the battery to ensure the safety of the energy storage system. However, in the related art, the power supply scheme for the battery management unit is not comprehensively considered, resulting in a risk of power loss for the battery management unit and affecting the safety of the energy storage system.

[0060] Based on this, an embodiment of the present utility model provides a power supply device. The first power extraction circuit is connected to the first battery box. At this time, the first power extraction circuit can extract power from the first battery box and provide a first power supply to the power management circuit. The second power extraction circuit is connected to the second battery box. At this time, the second power extraction circuit can extract power from the second battery box and provide a second power supply to the power management circuit. The power management circuit controls the first power supply provided by the first power extraction circuit and the second power supply provided by the second power extraction circuit to compete for power supply to supply power to the battery management unit. In this way, by using the first power extraction circuit and the second power extraction circuit to compete for power supply to the battery management unit, not only can the battery management unit obtain a stable and reliable power supply, which can maintain the working state of the battery management unit to the greatest extent so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); but also it can solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0061] The following further elaborates on the present utility model through the accompanying drawings and specific embodiments.

[0062] In an embodiment of the present utility model, Figure 1 is a schematic diagram of the composition structure of a power supply device provided by an embodiment of the present utility model Figure 1 . As Figure 1 shown, the power supply device 10 may include a first power extraction circuit 101, a second power extraction circuit 102, a power management circuit 103, and a battery management unit 104; among them:

[0063] The input end of the first power extraction circuit 101 is connected to the first battery box 11 and is configured to extract power from the first battery box 11 and provide a first power supply to the power management circuit 103;

[0064] The input end of the second power extraction circuit 102 is connected to the second battery box 12 and is configured to extract power from the second battery box 12 and provide a second power supply to the power management circuit 103;

[0065] The power management circuit 103 is configured to control the first power supply provided by the first power extraction circuit 101 and the second power supply provided by the second power extraction circuit 102 to compete for power supply to supply power to the battery management unit 104.

[0066] In the embodiment of the present utility model, the first power extraction circuit 101 and the second power extraction circuit 102 adopt a redundant design. During the same time period, only one power extraction circuit is put into operation, and the other power extraction circuit is in a backup state. Specifically, the first power extraction circuit 101 can be the main power supply, and the second power extraction circuit 102 can be the redundant power supply (or called "backup power supply"); alternatively, the first power extraction circuit can be the redundant power supply (or called "backup power supply"), and the second power extraction circuit 102 can be the main power supply. Here, the main power supply can also be called the main power supply of the main control box, and the redundant power supply can also be called the redundant power supply of the main control box. The battery box can be called the electrical box.

[0067] In the embodiment of the present utility model, the first power extraction circuit 101 and the second power extraction circuit 102 can be direct current / direct current (DC / DC) converters, which are used to convert the input voltage of each connection into the voltage required by the battery management unit. Exemplarily, the voltage required by the battery management unit is 24 volts (V). The first power extraction circuit 101 is used to convert the voltage (such as 1500V) obtained from the first battery box into 24V, and the second power extraction circuit 102 is used to convert the voltage (such as 220V) obtained from the second battery box into 24V. The power management circuit 103 controls the first power extraction circuit 101 and the second power extraction circuit 102 to compete to supply power to the battery management unit 104.

[0068] In the embodiment of the present utility model, for the first power supply controlling the first power extraction circuit and the second power supply controlling the second power extraction circuit to compete for power supply, it can be understood as comparing the power supply provided by the first power extraction circuit and the second power extraction circuit respectively. In some cases, the power supply with a larger power supply is used as the target power supply, that is, the one with a larger power supply is used for power supply. Exemplarily, if the first power supply is greater than the second power supply, then the first power supply is used as the target power supply to supply power to the battery management unit.

[0069] In some embodiments, the first battery box 11 is located inside the first container, the second battery box 12 is located inside the second container, and the first container and the second container belong to different containers.

[0070] In the embodiments of the present utility model, the energy storage system may include at least two containers. The at least two containers include a first container and a second container. The first container may be any one of the at least two containers in the energy storage system, and the second container is the container adjacent to the first container in the energy storage system, or the second container is any one of the at least two containers in the energy storage system except the first container, and no specific limitation is made here. For a container, it includes at least one battery box, and the battery box includes at least one battery. Taking power from the battery box can be understood as taking power from a certain battery in the battery box. And the battery box may further include a battery pack management unit, and each battery pack management unit is communicatively connected to the corresponding battery management unit. The battery pack management unit can monitor each battery pack and perform data interaction with the corresponding battery management unit. It can be understood that the battery management unit may be a slave battery management unit (SBMU), and each slave battery management unit correspondingly detects the state of a certain battery box or battery cabinet. Exemplarily, the battery pack management unit may be a cell supervision circuit (CSC). Here, it is assumed that the first container includes a plurality of battery boxes. For the first battery box connected to the first power-taking circuit in the power supply device, it is any one of the plurality of battery boxes in the first container; if the first battery box includes a plurality of batteries, then the first power-taking circuit is connected to any one of the batteries in the first battery box and takes power from this battery.

[0071] It should be noted that the batteries in the container may exist in the form of a battery cabinet composed of electric boxes, or may directly exist in the form of a battery box. The specific choice depends on the application scenario, design requirements, and safety considerations, and no specific limitation is made here. Exemplarily, the batteries may exist in the form of a battery cabinet. For a container, it may include at least one battery cabinet. For each battery cabinet, it includes at least one battery box. For each battery box, it includes at least one battery. Another exemplarily, the batteries may exist in the form of a battery box. For a container, it may include at least one battery box. For each battery box, it may include at least one battery.

[0072] In the embodiments of the present utility model, the first battery box and the second battery box are located in different containers, so that the power supply source for the battery management unit can be adjusted according to the actual situation of the container, and the working state of the battery management unit can be maintained to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); moreover, it can also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0073] In some embodiments, the first energy harvesting circuit 101 and the second energy harvesting circuit 102 are located inside the first container.

[0074] In the embodiments of the present utility model, by arranging the energy harvesting circuit inside the container, the container has a strong structure and good protection performance, which can effectively protect the internal energy harvesting circuit from physical damage and malicious destruction. Moreover, the energy harvesting circuit inside the container is isolated from the external environment, reducing the risk of circuit failures and safety accidents caused by environmental factors.

[0075] In the embodiments of the present utility model, when two energy harvesting circuits are located inside the same container, the space inside the container can be utilized more effectively, reducing unnecessary space waste, facilitating unified management and maintenance. And when the two energy harvesting circuits are located in the same container, their connection is closer, reducing system instability factors caused by poor connection or external interference.

[0076] That is to say, by arranging both the first energy harvesting circuit 101 and the second energy harvesting circuit 102 inside the same container, the two energy harvesting circuits are centrally arranged in the same container, which is convenient for unified management and maintenance, can reduce the workload of maintenance personnel, and improve the maintenance efficiency.

[0077] In some embodiments, the first energy harvesting circuit 101 is located inside the first container, and the second energy harvesting circuit 102 is located inside the second container.

[0078] In the embodiments of the present utility model, by placing the two energy harvesting circuits in different containers respectively, the position and layout of each container can be flexibly adjusted according to actual needs. And if the energy harvesting circuit in one container fails, it will not affect the energy harvesting circuit in the other container, thus reducing the overall risk of the system.

[0079] That is to say, by arranging the two energy harvesting circuits in two different containers respectively, when a problem occurs with one container or the energy harvesting circuit, it can be maintained or replaced separately without affecting the normal operation of the other container or the energy harvesting circuit, and the continuity of power supply can be maintained.

[0080] In the embodiments of the present utility model, it can be determined whether to arrange the two energy harvesting circuits in the same container or in different containers according to the application scenario of the container, user requirements, etc., and no specific limitation is made in this regard.

[0081] In some embodiments, the power management circuit 103 is configured to:

[0082] When the first container is in the upper high-voltage state, determine the target power supply from the first power supply provided by the first energy extraction circuit 101 and the second power supply provided by the second energy extraction circuit 102, and control the target power supply to supply power to the battery management unit 104; or,

[0083] When the first container is in the lower high-voltage state and the second energy extraction circuit 102 meets the preset conditions, control the second power supply provided by the second energy extraction circuit 102 to supply power to the battery management unit 104; or,

[0084] When the first container is in the lower high-voltage state and the second energy extraction circuit 102 does not meet the preset conditions, control the first power supply provided by the first energy extraction circuit 101 to supply power to the battery management unit 104.

[0085] In the embodiment of the present invention, the upper high-voltage state and the lower high-voltage state of the energy storage system mainly refer to two key operations during the operation of the energy storage system: power-on and power-off. Specifically, the upper high-voltage state, also known as power-on, refers to the process of connecting the energy storage system to a high-voltage power supply. The lower high-voltage state, also known as power-off, refers to the process of disconnecting the energy storage system from the high-voltage power supply. In the related art, when a certain container in the energy storage system is in the lower high-voltage state, the energy storage system connects the internal DC bus of the container and supplies the power of a certain battery in the battery box to the battery management unit to maintain the normal operation of the battery management unit. However, since the container is in the lower high-voltage state, except for the battery that supplies power to the battery management unit, the remaining batteries in the battery box are in a non-operating state, resulting in a decrease in the battery consistency in the battery box, thereby reducing the life of the energy storage system. The present invention uses the second energy extraction circuit for power supply when the power supply capacity of the second energy extraction circuit is sufficient, which can avoid the problem of reduced battery consistency in the battery box of the container.

[0086] In the embodiment of the present invention, when the first container is in the upper high-voltage state, determine the target power supply from the first power supply provided by the first energy extraction circuit and the second power supply provided by the second energy extraction circuit to supply power to the battery management unit, which can maintain the working state of the battery management unit to the greatest extent; or, when the first container is in the lower high-voltage state and the second energy extraction circuit meets the preset conditions, control the second power supply provided by the second energy extraction circuit to supply power to the battery management unit, so as to avoid the problem of reduced battery consistency in the battery box when the first container is in the lower high-voltage state, thereby extending the life of the energy storage system. Or, when the first container is in the lower high-voltage state and the second energy extraction circuit does not meet the preset conditions, control the first power supply provided by the first energy extraction circuit to supply power to the battery management unit. Although using the battery in the battery box to supply power to the battery management unit when the second container is in the lower high-voltage state will reduce the battery consistency in the battery box, it can maintain the working state of the battery management unit to the greatest extent.

[0087] In some embodiments, the second power-taking circuit meets a preset condition, including: the second battery box is in a normal state and the power supply duration is greater than or equal to a preset time threshold.

[0088] In the embodiments of the present invention, the second battery box being in a normal state may mean that the second battery box is normal and the container where the second battery box is located is in the upper high-voltage state, that is, the second container is not in the lower high-voltage state. Or, the second battery box being in a normal state may mean that the battery box has no abnormality and can supply power. At this time, the power supply duration of the second battery box is determined, so as to determine whether the power supply capacity of the second power-taking circuit can meet the power supply requirements of the battery management unit when the first container is in the lower high-voltage state, and further determine whether to use the second power-taking circuit to supply power to the battery management unit.

[0089] In the embodiments of the present invention, the battery management unit or other control units can obtain the state of the battery in the second battery box. After the battery management unit or other control units obtain the battery state, they evaluate the battery state to determine whether the second battery box is in a normal state and whether the power supply duration is greater than or equal to a preset time threshold. Exemplarily, if the battery in the second battery box is in a full-charge state, it can be determined that the second battery box is in a normal state and the duration is greater than or equal to a preset time threshold.

[0090] In the embodiments of the present invention, the preset time threshold is related to the upper high-voltage process. Specifically, the preset time threshold = the delay time in the upper high-voltage process + the upper high-voltage timeout time in the first stage + the isolation switch closing timeout time + the upper high-voltage timeout time in the second stage.

[0091] In the embodiment of the present utility model, the high-voltage charging of the energy storage system is divided into two stages. Specifically, in the first stage, it is the preliminary voltage boost, and in the second stage, it is the rated voltage boost. Specifically, in the first stage, the voltage of the energy storage system will gradually increase from a low value to a relatively high level, but usually will not directly reach the rated voltage. The purpose of the preliminary voltage boost is to gradually wake up each component in the system and make it gradually adapt to the high-voltage environment, reducing the impact on the equipment caused by sudden voltage boost. And during the voltage boost process, the system will conduct real-time monitoring of the equipment status, including the monitoring of key parameters such as current, voltage, and temperature. If any abnormality or fault is found during the voltage boost process, the system will immediately stop the voltage boost and issue an alarm so that the operator can take measures in time. In the second stage, after confirming that the equipment status is good in the first stage, the system will continue to boost the voltage until it reaches the rated voltage of the system. When the system voltage reaches the rated voltage, the system will enter the stable operation stage. In this stage, the system will continuously monitor the equipment status and adjust parameters such as voltage and current as needed to ensure the stable operation and efficient energy conversion of the system. Among them, the delay time in the high-voltage charging process is the delay time of all stages. The high-voltage charging timeout time in the first stage is the time when the time spent in the first stage exceeds the preset limit time. The high-voltage charging timeout time in the second stage is the time when the time spent in the second stage exceeds the preset limit time. The closing disconnector timeout time is the time from issuing the closing disconnector command to the disconnector being completely closed.

[0092] In this way, in the embodiment of the present utility model, when the first container is in the low-voltage state, by judging the state and power supply duration of the second battery box, it is determined whether the second power supply provided by the second energy extraction circuit supplies power to the battery management unit, avoiding the problem of the power supply of the battery management unit being interrupted due to insufficient power supply capacity of the second energy extraction circuit, and improving the safety and reliability of the system.

[0093] The embodiment of the present utility model provides a power supply device that uses the first energy extraction circuit and the second energy extraction circuit to compete to supply power to the battery management unit. Not only can the battery management unit obtain a stable and reliable power supply, but also can maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.). Moreover, it can also solve the problem of the reduction of the battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0094] In another embodiment of the present utility model, Figure 2 is the schematic composition structure of a power supply device provided by the embodiment of the present utility model Figure 2 . Such as Figure 2As shown, the power management circuit 103 includes a first management unit 201 and a second management unit 202; wherein:

[0095] The first management unit 201 includes a first voltage drop component a1, and the first management unit 201 is connected between the first energy extraction circuit 101 and the battery management unit 104;

[0096] The second management unit 202 includes a second voltage drop component b1, and the second management unit 202 is connected between the second energy extraction circuit 102 and the battery management unit 104.

[0097] In the embodiment of the present invention, the first voltage drop component a1 in the first management unit 201 performs a voltage drop process on the first power supply provided by the first energy extraction circuit, and the second voltage drop component b1 in the second management unit 201 performs a voltage drop process on the second voltage provided by the second energy extraction circuit 102. In this way, the power management circuit can control the first energy extraction circuit and the second energy extraction circuit to compete for power supply to maintain the working state of the battery management unit.

[0098] In some embodiments, the on-state voltage drop of the first voltage drop component a1 is less than the on-state voltage drop of the second voltage drop component b1;

[0099] The power management circuit 103 is further configured to determine the first power supply provided by the first energy extraction circuit 101 as the target power supply when the first power supply provided by the first energy extraction circuit 101 and the second power supply provided by the second energy extraction circuit 102 compete for power supply, and control the target power supply to supply power to the battery management unit 104.

[0100] In the embodiment of the present invention, the first voltage drop component a1 and the second voltage drop component b1 may both be composed of diodes with equal on-state voltage drops, and when the voltage drop components include multiple diodes, these multiple diodes are connected in series. At this time, the number of diodes included in the first voltage drop component a1 needs to be less than the number of diodes included in the second voltage drop component. For example, the first voltage drop component a1 may include two diodes, and the second voltage drop component may include three diodes. Or, for another example, the second voltage drop component b1 may be composed of one diode connected in series, and the second voltage drop component may include two diodes. Or, the first voltage drop component a1 and the second voltage drop component b1 may be composed of diodes with different on-state voltage drops. If the voltage drop components include multiple diodes, they can be connected in series, in parallel, or in series-parallel connection, as long as the on-state voltage drop of the first voltage drop component a1 is less than the on-state voltage drop of the second voltage drop component b1, and no specific limitation is made in this regard.

[0101] Thus, in the embodiment of the present utility model, the on-state voltage drop of the first voltage drop component is less than that of the second voltage drop component. For example, when the first power supply and the second power supply are equal, the power management circuit determines the first power supply provided by the first energy extraction circuit as the target power supply to supply power to the battery management unit. In this way, when the first container is in the upper high-voltage state, the first power supply provided by the first energy extraction circuit is preferentially used to supply power to the battery management unit, which can reduce the connection and dependency relationships between devices, thereby improving the overall stability and reliability of the system.

[0102] In some embodiments, continuing as Figure 2 shown, the first management unit 201 further includes a switch component a2; wherein:

[0103] The power management circuit 103 is further configured to keep the switch component a2 closed when the first container is in the upper high-voltage state, so that the first power supply provided by the first energy extraction circuit 101 and the second power supply provided by the second energy extraction circuit 102 compete for power supply; or, when the first container is in the lower high-voltage state and the second energy extraction circuit 102 meets the preset conditions, control the switch component a2 to disconnect, so that the second power supply provided by the second energy extraction circuit 102 supplies power to the battery management unit 104. [[ID=!0]]

[0104] In the embodiment of the present utility model, the switch component a2 can be a switch or can also be a relay, and no specific limitation is made thereto, as long as the switch component a2 can conduct or disconnect the path between the first energy extraction circuit and the battery management unit.

[0105] In the embodiment of the present utility model, the prerequisite for applying upper high voltage to the first container in the energy storage system is that the entire device cannot malfunction. The battery management controller (BMC) will send a fault clearance instruction to the battery management unit, and the battery management unit will clear the fault of the second energy extraction circuit. At this time, the second energy extraction circuit is considered normal. When the first container is in the lower high-voltage state, the switch component in the energy storage system will disconnect. If it is found that the second energy extraction circuit cannot continuously supply power, then the switch component will close at this time, and thus an infinite loop state will occur, and the switch component will close and disconnect frequently, reducing the service life of the switch component. Therefore, judging the power supply ability of the second energy extraction circuit can avoid the problem that the frequent closing and disconnecting of the switch component affects its service life.

[0106] In the embodiment of the present utility model, when the first container is in the upper high-voltage state, the power management circuit keeps the switching component closed, so that the first power supply provided by the first energy extraction circuit and the second power supply provided by the second energy extraction circuit are used for power supply, enabling the battery management unit to obtain a stable and reliable power supply, and maintaining the working state of the battery management unit to the greatest extent, so that the battery management unit can continuously work; or, when the first container is in the lower high-voltage state and the second energy extraction circuit meets the preset conditions, the power management circuit controls the switching component to disconnect, so that the second voltage provided by the second energy extraction circuit supplies power to the battery management unit, which can avoid the problem of reduced battery consistency in the battery box when the energy storage system is in the lower high-voltage state, thereby extending the service life of the energy storage system.

[0107] In a specific embodiment, Figure 3 This is a detailed structural schematic diagram of a power management circuit provided by the embodiment of the present utility model. As Figure 3 shown, the power management circuit 103 includes a switch S1, a first diode D1, a second diode D2, and a third diode D3.

[0108] In the embodiment of the present utility model, the switch S1 can be a normally closed relay, that is, the switching component a2; the first diode D1 is a first voltage drop component; the second diode D2 and the third diode D3 are connected in series to form a second voltage drop component.

[0109] The embodiment of the present utility model provides a power supply device, which can control the first energy extraction circuit and the second energy extraction circuit to compete for power supply through the power management circuit to supply power to the battery management unit, enabling the battery management unit to obtain a stable and reliable power supply, and maintaining the working state of the battery management unit to the greatest extent, so that the battery management unit can continuously work.

[0110] In another embodiment of the present utility model, based on the power supply device of the foregoing embodiment, Figure 4 This is a structural schematic diagram of a container power supply provided by the embodiment of the present utility model. As Figure 4 described, the container power supply 40 includes a power management circuit 103, a battery management unit 104, and a first battery box 11; wherein:

[0111] The input end of the first energy extraction circuit 101 is connected to the first battery box 11, and is configured to supply the first power supply to the power management circuit 103 after taking power from the first battery box 11;

[0112] The input end of the second energy extraction circuit 102 is connected to the second battery box 12, and is configured to supply the second power supply to the power management circuit 103 after taking power from the second battery box 12;

[0113] The power management circuit 103 is configured to control the first power supply provided by the first energy extraction circuit 101 and the second power supply provided by the second energy extraction circuit 102 to compete for power supply to supply power to the battery management unit 104.

[0114] In the embodiment of the present utility model, the container power supply can be located inside the container to provide stable and reliable power supply for various devices inside the container. In addition, the container power supply can integrate a variety of electrical devices, such as relays, switches, etc., and can control the power supply to supply power to the devices to be powered.

[0115] In some embodiments, the second battery box and the container power supply are located in different containers.

[0116] In the embodiment of the present utility model, the second battery box and the container power supply are located in different containers, that is, the first battery box and the second battery box are located in different containers, and the two energy extraction circuits draw power from different containers. In this way, the power supply source for the battery management unit can be adjusted according to the actual situations of the two containers, and the working state of the battery management unit can be maintained to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); moreover, it can also solve the problem of reduced battery consistency of a single battery box caused by the continuous power supply of the battery box in some cases, thereby being able to extend the service life of the energy storage system and improve the safety and reliability of the energy storage system.

[0117] The description of the above container power supply embodiments is similar to the description of the above power supply device embodiments and has similar beneficial effects of the same embodiments. For the technical details not disclosed in the container power supply embodiments of the present utility model, please refer to the description of the power supply device embodiments of the present utility model for understanding.

[0118] In another embodiment of the present utility model, the embodiment of the present utility model provides an energy storage system, which includes two container power supplies. At least two container power supplies include a first container power supply and a second container power supply, and the first container power supply at least includes a power management circuit, a battery management unit, and a first battery box, and the second container power supply at least includes a second battery box; wherein:

[0119] The input end of the first energy extraction circuit is connected to the first battery box and is configured to draw power from the first battery box and then provide a first power supply to the power management circuit;

[0120] The input end of the second energy extraction circuit is connected to the second battery box and is configured to draw power from the second battery box and then provide a second power supply to the power management circuit;

[0121] The power management circuit is configured to control the first power supply provided by the first energy extraction circuit and the second power supply provided by the second energy extraction circuit to compete for power supply to supply power to the battery management unit.

[0122] In the embodiments of the present utility model, different container power supplies can be located inside different containers to provide stable and reliable power supply for various devices in different containers.

[0123] In some embodiments, the first container power supply, the first energy extraction circuit, and the second energy extraction circuit are all located inside the first container; or, the first container power supply and the first energy extraction circuit are located inside the first container, and the second container power supply and the second energy extraction circuit are located inside the second container.

[0124] In this way, both the first energy extraction circuit and the second energy extraction circuit are arranged in the same container where the first container power supply is located. Concentrating the two energy extraction circuits in the same container facilitates unified management and maintenance, can reduce the workload of maintenance personnel, and improve the maintenance efficiency; or, the two energy extraction circuits are respectively arranged in the containers where the two container power supplies are located. In this case, when a problem occurs with one container power supply or energy extraction circuit, it can be maintained or replaced separately without affecting the normal operation of the other container power supply or energy extraction circuit, and the continuity of power supply can be maintained.

[0125] Here, the description of the energy storage system embodiments is similar to that of the above power supply device embodiments and has beneficial effects similar to those of the same embodiments. For the technical details not disclosed in the energy storage system embodiments of the present utility model, please refer to the description of the power supply device embodiments of the present utility model for understanding.

[0126] In another embodiment of the present utility model, the battery in the container power supply can exist in the form of an electric cabinet composed of one or more battery boxes. For one container, it can include at least one electric cabinet, and the electric cabinet can include at least one battery box, where this at least one battery box includes the first battery box but does not include the second battery box.

[0127] Here, all modules of the power supply device are located in the same container as the first battery box; or, some modules of the power supply device are located in the same container as the first battery box, and the remaining part of the power supply device is located in the same battery box as the second battery box. It should be noted that the first battery box and the second battery box are located in different containers.

[0128] In some embodiments, when the first battery box, the first energy extraction circuit, the second energy extraction circuit, the power management circuit, and the battery management unit are all arranged in the same container, that is, the first battery box and the power supply device are both arranged in the same container, the embodiments of the present utility model provide a container that can include at least one electric cabinet, and each electric cabinet includes at least one battery box and the power supply device described in the above embodiments.

[0129] In a specific embodiment, all modules of the power supply device 10 are located in the same container as the first battery box. Figure 5 FIG. is a schematic structural diagram of a cabinet provided by an embodiment of the present invention; as Figure 5 shown, the cabinet 50 includes a battery box and a power supply device 10.

[0130] In the embodiment of the present invention, the cabinet 50 includes a plurality of battery boxes (such as battery box #1,..., battery box #S), at least one of which includes a first battery box but does not include a second battery box, and each battery box includes at least one battery; the first power extraction circuit in the power supply device extracts power from the first battery box in the battery cabinet. In addition, through the battery management unit in the power supply device 10, each battery in the cabinet can be monitored to improve the safety of the energy storage system.

[0131] In the embodiment of the present invention, each battery cabinet in the container includes Figure 2 the power supply device shown for supplying power to the battery management unit. Thus, in the embodiment of the present invention, since each cabinet in the container includes a power supply device, and the first power extraction circuit and the second power extraction circuit compete to supply power to the battery management unit, not only can the battery management unit obtain a stable and reliable power supply, but also the working state of the battery management unit can be maintained to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.).

[0132] In some embodiments, the embodiment of the present invention provides an energy storage system, which includes at least two containers, where: for each container, it includes a housing and at least one cabinet, and at least one cabinet is located inside the housing.

[0133] In a possible embodiment, the first battery box, the first power extraction circuit, the second power extraction circuit, the power management circuit, and the battery management unit are all arranged in the same container. In another possible embodiment, the first battery box, the first power extraction circuit, the power management circuit, and the battery management unit are arranged in the first container, and the second battery box and the second power extraction circuit are arranged in the second container. No specific limitation is made in this regard.

[0134] In the embodiment of the present invention, when all modules of the power supply device are located in the same container as the first battery box, Figure 6Schematic diagram of the composition structure of an energy storage system provided by an embodiment of the present utility model. The energy storage system 60 may include p containers (Container 1, Container 2, …, Container p). Usually, these p containers are stacked to be integrated into an overall structure of a high-voltage energy storage system; where p is greater than or equal to 2 and p is a positive integer. In addition, for each container, it includes at least one electrical cabinet and a housing, and at least the electrical cabinets are connected in parallel and located inside the housing. Taking Container 1 as an example for illustration, Container 1 includes n electrical cabinets (Electrical Cabinet 1-1, Electrical Cabinet 1-2, …, Electrical Cabinet 1-n). By connecting these n electrical cabinets in parallel, they are integrated into the housing of one container, that is Figure 5 The solid-line rectangular box therein; where n, m, and v are all positive integers. In addition, the values of n, m, and v may be the same or different, which are determined according to the implementation situation.

[0135] In an embodiment of the present utility model, it is assumed that the energy storage system includes 3 containers (such as Container 1, Container 2, and Container 3). The second power-taking circuit in the power supply device in Container 1 takes power from the battery box in Container 2, the second power-taking circuit in the power supply device in Container 2 takes power from the battery box in Container 3, and the second power-taking circuit in the power supply device in Container 3 takes power from the battery box in Container 1; or, the second power-taking circuit in the power supply device in Container 1 takes power from the battery box in Container 3, the second power-taking circuit in the power supply device in Container 2 takes power from the battery box in Container 1, and the second power-taking circuit in the power supply device in Container 3 takes power from the battery box in Container 2; or the second power-taking circuit in the power supply device in Container 1 takes power from the battery box in Container 2 or Container 3, the second power-taking circuit in the power supply device in Container 2 takes power from the battery box in Container 1 or Container 3, and the second power-taking circuit in the power supply device in Container 3 takes power from the battery box in Container 1 or Container 2, that is, redundant power supply can be performed between any two containers. No specific limitation is made on this.

[0136] In a specific embodiment, the second power-taking circuit is connected to the power supply bus of the second container and is used to take power from the second container to supply power to the battery management unit. Here, the power supply bus may be connected to the second battery box in the second container and is used to take power from the second battery box.

[0137] An embodiment of the present utility model provides an energy storage system. Each electrical cabinet in the energy storage system includes a power supply device, and a first power taking circuit and a second power taking circuit compete to supply power to the battery management unit. This can not only enable the battery management unit to obtain a stable and reliable power supply, maintain the working state of the battery management unit to the greatest extent, so that the battery management unit can continue to work (such as fault diagnosis and processing, etc.); but also solve the problem of reduced battery consistency of a single battery box caused by continuous power supply of the battery box in some cases, thereby extending the service life of the energy storage system and improving the safety and reliability of the energy storage system.

[0138] In some embodiments, when all modules of the power supply device 10 are located in the same container as the first battery box, Figure 7 is a detailed composition schematic diagram of an energy storage system provided by an embodiment of the present utility model. As Figure 7 shown, the energy storage system 60 includes multiple containers, and each container includes multiple electrical cabinets.

[0139] In the embodiment of the present utility model, as Figure 7 shown, the energy storage system 60 includes k containers, and each container includes n electrical cabinets. Here, taking container 1 as an example for illustration, container 1 includes capacitor C1, switch k11, switch K12, electrical cabinet 1-1, pre-charge resistor Rk1 corresponding to electrical cabinet 1-1, main positive relay K111, pre-charge relay K112 and main negative relay K113 corresponding to electrical cabinet 1-1,..., electrical cabinet 1-n, pre-charge resistor R1n corresponding to electrical cabinet 1-n, main positive relay K1n1, pre-charge relay K1n2 and main negative relay K1n3 corresponding to electrical cabinet 1-n; for the connection relationships of various devices and modules, as shown in the figure, no further elaboration will be made here.

[0140] In the present utility model, capacitor C1 can play the roles of energy storage filtering and voltage stabilization, and can also improve the power quality, reduce the electromagnetic interference and noise emitted by container 1, thereby improving the working stability of container 1. And by closing and opening switch K11 and / or switch K12, the on-off of the path between the battery cabinet and the load can be controlled. In this way, before the load is connected to container 1, both switch K11 and switch K12 are in the off state, thus avoiding the electric shock phenomenon when the user manually connects the load, and further reducing the harm to personal safety.

[0141] In the embodiment of the present utility model, for each electrical cabinet, it is connected with a main positive relay, a main negative relay, a pre-charge relay and a pre-charge resistor. Through the collaborative work of these devices, the safe, stable operation and efficient charging of the battery in the battery cabinet are jointly ensured. Specifically, the main positive relay and the main negative relay are responsible for controlling the on-off of the circuit, and the pre-charge relay and the pre-charge resistor are responsible for protecting the battery and the circuit during the charging process, avoiding damage to the battery and the circuit caused by instantaneous large current.

[0142] In some embodiments, when all modules of the power supply device are located in the same container as the first battery box, the electrical cabinet 1-1 in container 1 is still used as an example for illustration, that is Figure 7 the modules enclosed by the dashed rectangular box Figure 8 is a schematic diagram of the detailed composition structure of an electrical cabinet provided by an embodiment of the present invention. As Figure 8 shown, the application framework includes an electrical cabinet 50, a disconnector 801, a first DC converter 802, a second DC converter 803, a power management circuit 103, a battery management unit 104, and a circuit to be powered 804.

[0143] Here, when all modules of the power supply device are located in the same container as the first battery box, the electrical cabinet 50 can be Figure 6 and Figure 7 the electrical cabinet 1-1 in container 1 shown in Figure 8 or other electrical cabinets. Here it is only used as an example. In addition, the container where the electrical cabinet is located can be called the main control box; the first DC converter 802 is the first energy extraction circuit described in the above embodiment, the second DC converter 803 is the second energy extraction circuit described in the above embodiment, the switch S1 is the switch component described in the above embodiment, the first diode D1 is the first voltage drop component described in the above embodiment, and the second diode D2 and the third diode D3 form the second voltage drop component described in the above embodiment. The circuit to be powered 804 can include a main relay (i.e., a main positive relay K112 and a main negative relay K113), a pre-charge relay K112, and a current transformer; wherein the current transformer can be in the battery box and is used to monitor the current in the battery box. Here, the container where the electrical cabinet 50 is located can be the first container, and the container ( Figure 8 not shown in

[0144] In an embodiment of the present invention, the first DC converter 802 can be a DC / DC converter, which can convert the power provided by the first battery (for example, 1500V DC electricity, abbreviated as "1500VDC") into a first power supply (for example, 24V DC electricity, abbreviated as "24VDC"), and supply the first power supply to the power management circuit 103; the second DC converter 604 can also be a DC / DC converter, which can convert the power provided by the power supply bus of the first container (for example, container p) (for example, 220V DC electricity, abbreviated as "220VDC") into a second power supply (for example, 24VDC), and supply the second power supply to the power management circuit 103. Here, the first power supply can be abbreviated as 24VDC1, and the second power supply can be abbreviated as 24VDC2.

[0145] In an embodiment of the present invention, as Figure 7As shown in the figure, the electrical cabinet 50 includes multiple battery boxes (Battery Box #1, …, Battery Box #S), and each battery box includes multiple batteries. Taking Battery Box #1 as an example, the batteries in the battery box can be connected by a Manual Service Disconnect Fuse (MSD) fuse. Among them, the MSD, as a manual maintenance switch, allows operators to disconnect the battery system when needed for maintenance or inspection. The Fuse, on the other hand, serves as a circuit protection device that can automatically cut off the circuit when the battery is overloaded or short-circuited, preventing equipment damage or fire caused by excessive current. In addition, Battery Box #1 may also include CSC#1. Exemplarily, CSC#1 can be a current transformer, which is used to check the status of the corresponding battery box and determine whether the container where the power supply device is located enters the fault mode based on the status of each battery box.

[0146] In some embodiments, based on Figure 7 , a specific description of the application of the power supply device provided by the embodiments of the present utility model is given:

[0147] (1) The power supply circuit for the battery management unit 104 includes Circuit One and Circuit Two. Specifically, Circuit One: The first DC converter 802 takes power from the first battery in the first battery box and converts it into the first power supply to provide to the power management circuit 103, and the power management circuit 103 provides power to the battery management unit 104; Circuit Two: The second DC converter 803 takes power from the power supply bus of the first container (such as container p) and converts it into the second power supply to provide to the power management circuit 103, and the power management circuit 103 provides power to the battery management unit 104; among them, Circuit One takes power from the upper port of the isolation switch 801 (i.e., the first battery in the first battery box), and Circuit Two takes power from the power supply bus of the second container. Here, the power supply bus of the second container is connected to the second battery box in the second container to take power from the second battery box. Here, the power management circuit 103 supplies power to the battery management unit 104. For example, it can be that the power management circuit 103 supplies power to the SBMU.

[0148] (2) When the electrical cabinet 50 is in the high-voltage state, the low-side drive of the battery management unit (disabled), and the switch S1 is kept closed. After the high-voltage state is successfully achieved, at this time, the main power supply (i.e., Circuit One) and the redundant power supply (i.e., Circuit Two) compete for power supply.

[0149] (3) When the electrical cabinet 50 is in the low-voltage state and the redundant power supply is in the normal state and the power supply duration is equal to the preset time threshold, at this time, the high-side drive of the battery management unit 104 (enabled), that is, an excision signal is sent, causing the switch S1 to disconnect. At this time, Circuit One stops power supply, and Circuit Two supplies power alone.

[0150] (4) The electrical cabinet 50 is in the lower high-voltage state and the redundant power supply state is abnormal. The low-side drive (disabled) of the battery management unit 104 keeps the switch S1 closed, and at this time, the circuit one supplies power alone.

[0151] Here, the switch S1 is a normally closed relay. If the power supply duration of the redundant power supply is less than the preset time threshold, even if using the main power supply to supply power will cause the battery consistency in the electrical box to decrease, the main power supply still needs to be used to supply power to ensure continuous power supply to the battery management unit, so that the battery management unit can continue to work (such as fault diagnosis and handling, etc.), and improve the safety and reliability of the energy storage system.

[0152] In the embodiment of the present utility model, using the main power supply and the redundant power supply to competitively supply power to the battery management unit can ensure the continuous operation of the battery management unit to the greatest extent (such as fault diagnosis and handling, etc.); moreover, it can avoid the problem that when the energy storage system is in the lower high-voltage state, due to the single electrical box continuously supplying power to the main power supply, and the main power supply then supplying power to the battery management unit, the battery consistency in the single electrical box decreases and the service life of the energy storage system decreases.

[0153] In the embodiment of the present utility model, using the main power supply of the main control box and the redundant power supply of the main control box to competitively supply power to the battery management unit can ensure the continuous operation of the SBMU to the greatest extent (such as fault diagnosis and handling, etc.); moreover, it can avoid the problem that when the energy storage system is in the lower high-voltage state, due to the single electrical box continuously supplying power to the main power supply of the main control box, and the main control main power supply then supplying power to the battery management unit, the battery consistency in the single electrical box decreases and the service life of the energy storage system decreases. In addition, it avoids the problem that the rapid on-off of the battery management unit or the power management circuit affects the service life.

[0154] In another embodiment of the present utility model, based on the foregoing embodiment, the embodiment of the present utility model provides a power supply control method, and the power supply control method includes:

[0155] When the output ends of the first power-taking circuit and the second power-taking circuit are both connected to the power management circuit, the power management circuit controls the first power supply provided by the first power-taking circuit and the second power supply provided by the second power-taking circuit to competitively supply power to the battery management unit.

[0156] In some specific implementation manners, based on Figure 8 the shown electrical cabinet, Figure 9 is a schematic flow chart of a power supply control method provided by an embodiment of the present utility model. As Figure 9 shown, the power supply control method includes:

[0157] S901, start.

[0158] S902, whether the electrical cabinet is in the low-voltage state, whether the redundant power supply of the main control box is normal, and whether the power supply duration is equal to the preset time threshold.

[0159] In the embodiment of the present utility model, when the judgment result of step S902 indicates yes, step S903 is executed; when the judgment result of step S902 indicates no, step S904 is executed.

[0160] S903, the high-side drive (enable) of the battery management unit, and switch S1 is disconnected.

[0161] S904, the low-side drive (disable) of the battery management unit, and switch S1 remains closed.

[0162] S905, end.

[0163] In the embodiment of the present utility model, the main power supply of the main control box (i.e., the first power-taking circuit) and the redundant power supply of the main control box (i.e., the second power-taking circuit) are used to supply power to the battery management unit competitively at the same time, which can ensure the continuous operation of the battery management unit to the greatest extent (such as fault diagnosis and processing, etc.); and it can avoid the situation where the electrical cabinet is in the low-voltage state, due to the single electrical box continuously supplying power to the main power supply of the main control box, and the main control main power supply further supplies power to the battery management unit, resulting in a decrease in the battery consistency in the single electrical box and a decrease in the service life of the energy storage system. In addition, it can also avoid the problem that the rapid on-off cycle of the battery management unit or the power management circuit affects the service life.

[0164] It should be noted here that the description of the above method embodiments is similar to the description of the above device embodiments, and has similar beneficial effects to the device embodiments. For the technical details not disclosed in the method embodiments of the present utility model, please refer to the description of the device embodiments of the present utility model for understanding.

[0165] It should be noted that in the present utility model, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, product 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, product or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, product or device including that element.

[0166] The serial numbers of the above embodiments of the present utility model are only for description and do not represent the advantages and disadvantages of the embodiments.

[0167] The methods disclosed in several method embodiments provided by the present utility model can be combined arbitrarily without conflict to obtain new method embodiments.

[0168] The features disclosed in several product embodiments provided by the present utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0169] The features disclosed in several method or device embodiments provided by the present utility model can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0170] The above is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model.

Claims

1. A power supply device, characterized in that, The power supply device includes a first power extraction circuit, a second power extraction circuit, a power management circuit, and a battery management unit; wherein: The input end of the first power extraction circuit is connected to the first battery box, and is configured to supply power to the power management circuit with the first power after extracting power from the first battery box; The input end of the second power extraction circuit is connected to the second battery box, and is configured to supply power to the power management circuit with the second power after extracting power from the second battery box; The power management circuit is configured to control the first power provided by the first power extraction circuit and the second power provided by the second power extraction circuit to compete for power supply to supply power to the battery management unit.

2. The power supply device according to claim 1, wherein The first battery box is located inside the first container, the second battery box is located inside the second container, and the first container and the second container belong to different containers.

3. The power supply device according to claim 2, wherein The first power extraction circuit and the second power extraction circuit are located inside the first container; or, The first power extraction circuit is located inside the first container, and the second power extraction circuit is located inside the second container.

4. The power supply device according to any one of claims 1 to 3, characterized in that The power management circuit includes a first management unit and a second management unit; wherein: The first management unit includes a first voltage drop component, and the first management unit is connected between the first power extraction circuit and the battery management unit; The second management unit includes a second voltage drop component, and the second management unit is connected between the second power extraction circuit and the battery management unit.

5. The power supply device according to claim 4, wherein, The on-state voltage drop of the first voltage drop component is less than the on-state voltage drop of the second voltage drop component; The power management circuit is further configured to determine the first power provided by the first power extraction circuit as the target power supply when the first power provided by the first power extraction circuit and the second power provided by the second power extraction circuit compete for power supply, and control the target power supply to supply power to the battery management unit.

6. The power supply device according to claim 4, characterized in that, The first management unit further includes a switch component; wherein: The switch component is configured to be in a closed state when the first container is in the upper high-voltage state; or in an open state when the first container is in the lower high-voltage state and the second power extraction circuit meets a preset condition.

7. A container power supply, characterized in that, The container power supply includes at least a power management circuit, a battery management unit, and a first battery box; wherein: The input end of the first power extraction circuit is connected to the first battery box, and is configured to supply power to the power management circuit with the first power after extracting power from the first battery box; The input end of the second power extraction circuit is connected to the second battery box, and is configured to supply power to the power management circuit with the second power after extracting power from the second battery box; The power management circuit is configured to control the first power provided by the first power extraction circuit and the second power provided by the second power extraction circuit to compete for power supply to supply power to the battery management unit.

8. The container power supply according to claim 7, wherein The second battery box and the container power supply are located in different containers.

9. A energy storage system, characterized in that, The energy storage system includes at least two container power supplies. The at least two container power supplies include a first container power supply and a second container power supply. And the first container power supply at least includes a power management circuit, a battery management unit, and a first battery box. The second container power supply at least includes a second battery box; wherein: The input end of the first power extraction circuit is connected to the first battery box and is configured to provide a first power supply to the power management circuit after extracting power from the first battery box; The input end of the second power extraction circuit is connected to the second battery box and is configured to provide a second power supply to the power management circuit after extracting power from the second battery box; The power management circuit is configured to control the first power supply provided by the first power extraction circuit and the second power supply provided by the second power extraction circuit to compete for power supply to supply power to the battery management unit.

10. The energy storage system according to claim 9, wherein The first container power supply, the first power extraction circuit, and the second power extraction circuit are all located inside the first container; or The first container power supply and the first power extraction circuit are located inside the first container, and the second container power supply and the second power extraction circuit are located inside the second container.

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