Energy storage system and power supply method

Abstract

The invention provides an energy storage system and a power supply method, and relates to the technical field of power supply, the energy storage system comprises a battery stack, a first energy storage converter and a second energy storage converter, the battery stack is connected with the first energy storage converter and the second energy storage converter, and the first energy storage converter is connected with a load and a photovoltaic panel, the photovoltaic panel charges the battery stack through the first energy storage converter to supplement the electric quantity of the battery stack, and the second energy storage converter is connected with the load, so that the first energy storage converter is disconnected with the battery stack, the load and the photovoltaic panel under the condition that the first energy storage converter is overhauled, and the battery stack supplies power to the load through the second energy storage converter. And under the condition that the second energy storage converter is overhauled, the second energy storage converter is disconnected with the battery stack and the load, and the battery stack supplies power to the load through the first energy storage converter, so that power is normally supplied to the load under the condition that the interior of the energy storage system is overhauled, and the power utilization experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power supply, and particularly relates to an energy storage system and a power supply method. BACKGROUND

[0002] In the related art, the energy storage system is used to supply power to the load. However, in the case of internal maintenance of the energy storage system, the power supply to the load is interrupted, resulting in poor power experience of the user. SUMMARY

[0003] The application aims to provide an energy storage system and a power supply method, and at least solve the problem that in the related art, in the case of internal maintenance of the energy storage system, the power supply to the load is interrupted, resulting in poor power experience of the user.

[0004] In order to solve the above technical problems, the application is implemented as follows: In a first aspect, an energy storage system is provided, comprising: a battery stack, a first energy storage converter, and a second energy storage converter. The battery stack is connected to the first energy storage converter and the second energy storage converter, respectively. The first energy storage converter is connected to the load and the photovoltaic panel, respectively; and the photovoltaic panel is used to charge the battery stack through the first energy storage converter. The second energy storage converter is connected to the load. In the case of maintenance of the first energy storage converter, the first energy storage converter is disconnected from the battery stack, the load, and the photovoltaic panel, respectively, and the battery stack is used to supply power to the load through the second energy storage converter; in the case of maintenance of the second energy storage converter, the second energy storage converter is disconnected from the battery stack and the load, respectively, and the battery stack is used to supply power to the load through the first energy storage converter.

[0005] Optionally, the energy storage system further comprises a first switch device, a second switch device, a third switch device and a fourth switch device; the first switch device is connected with the first energy storage converter, the second energy storage converter and the load respectively; the second switch device is connected with the first energy storage converter and the battery stack respectively; the third switch device is connected with the first energy storage converter and the photovoltaic panel respectively; the fourth switch device is connected with the second energy storage converter and the battery stack respectively; wherein, in the case of maintenance of the first energy storage converter, the load and the second energy storage converter are connected through the first switch device, the load is disconnected with the first energy storage converter, the second switch device and the third switch device are both disconnected, and the fourth switch device is turned on; in the case of maintenance of the second energy storage converter, the load and the first energy storage converter are connected through the first switch device, the load is disconnected with the second energy storage converter, the second switch device and the third switch device are both turned on, and the fourth switch device is disconnected.

[0006] Optionally, the energy storage system further comprises a fifth switch device; the fifth switch device is connected with the first switch device and the power grid respectively; wherein, in the case of maintenance of the battery stack, the load is connected with the fifth switch device through the first switch device, the load is disconnected with the second energy storage converter, the second switch device and the fourth switch device are both disconnected, and the fifth switch device is turned on to supply power to the load through the power grid.

[0007] Optionally, the fifth switch device is further connected with the first energy storage converter; the power grid is used to charge the battery stack through the first energy storage converter; wherein, in the case of maintenance of the first energy storage converter, the fifth switch device is disconnected; in the case of maintenance of the second energy storage converter, the fifth switch device is turned on.

[0008] Optionally, the energy storage system further comprises a sixth switch device; the sixth switch device is connected with the first switch device, the fifth switch device and the first energy storage converter respectively; wherein, in the case of maintenance of the first energy storage converter and the second energy storage converter, the load is connected with the fifth switch device through the first switch device, the load is disconnected with the second energy storage converter, the second switch device, the third switch device, the fourth switch device and the sixth switch device are all disconnected, and the fifth switch device is turned on to supply power to the load through the power grid.

[0009] Optionally, during a preset time period, both the second and fifth switching devices are turned on, allowing the power grid to charge the battery stack through the first energy storage converter; wherein, during the preset time period, the electricity price of the power grid is less than an electricity price threshold.

[0010] Optionally, during the preset time period, the load is connected to the fifth switching device and disconnected from the second energy storage converter via the first switching device, so as to supply power to the load through the power grid.

[0011] Optionally, the energy storage system further includes a battery management system; the battery management system is connected to the battery stack, the first energy storage converter, and the second energy storage converter respectively. The battery management system is used to disconnect the first energy storage converter from the battery stack, the load, and the photovoltaic panel respectively when the first energy storage converter is under maintenance, and to allow the battery stack to supply power to the load through the second energy storage converter; and to disconnect the second energy storage converter from the battery stack and the load respectively when the second energy storage converter is under maintenance, and to allow the battery stack to supply power to the load through the first energy storage converter.

[0012] Optionally, the battery management system is also used to control the power grid to supply power to the load in the event of maintenance of the battery stack.

[0013] Secondly, embodiments of this application provide a power supply method applied to the energy storage system as described in the first aspect, the method comprising: In the event of maintenance of the first energy storage converter, the first energy storage converter is disconnected from the battery stack, the load, and the photovoltaic panel respectively, and the battery stack supplies power to the load through the second energy storage converter; In the event of maintenance of the second energy storage converter, the second energy storage converter is disconnected from both the battery stack and the load, and the battery stack supplies power to the load through the first energy storage converter.

[0014] In this embodiment, since the battery stack is connected to a first energy storage converter and a second energy storage converter respectively, and the first energy storage converter is connected to the load and the photovoltaic panel respectively, wherein the photovoltaic panel charges the battery stack through the first energy storage converter to supplement the battery stack's power, and the second energy storage converter is connected to the load, then by disconnecting the first energy storage converter from the battery stack, the load, and the photovoltaic panel respectively when the first energy storage converter is under maintenance, and allowing the battery stack to supply power to the load through the second energy storage converter, and by disconnecting the second energy storage converter from the battery stack and the load respectively when the second energy storage converter is under maintenance, and allowing the battery stack to supply power to the load through the first energy storage converter, the load is normally powered even when the energy storage system is under maintenance. Compared with related technologies where the load power supply is interrupted during maintenance of the energy storage system, this improves the user's power consumption experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the specific structure of an energy storage system provided in an embodiment of this application; Figure 3 This is a flowchart of a power supply method provided in an embodiment of this application.

[0017] Figure label: 10-Battery stack; 20-First energy storage converter; 30-Second energy storage converter; 40-Load; 50-Photovoltaic panel; 60-Grid; 70-Enclosure; K1-First switching device; K2-Second switching device; K3-Third switching device; K4-Fourth switching device; K5-Fifth switching device; K6-Sixth switching device; K7-Seventh switching device; F1-First fuse; F2-Second fuse; U1-Voltage detection chip. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] Reference Figure 1 This application provides an energy storage system, including: a battery stack 10, a first energy storage converter 20, and a second energy storage converter 30; the battery stack 10 is connected to the first energy storage converter 20 and the second energy storage converter 30 respectively; the first energy storage converter 20 is used to connect to a load 40 and a photovoltaic panel 50 respectively; the photovoltaic panel 50 is used to charge the battery stack 10 through the first energy storage converter 20; the second energy storage converter 30 is used to connect to the load 40; wherein, when the first energy storage converter 20 is under maintenance, the first energy storage converter 20 is disconnected from the battery stack 10, the load 40, and the photovoltaic panel 50 respectively, and the battery stack 10 supplies power to the load 40 through the second energy storage converter 30; when the second energy storage converter 30 is under maintenance, the second energy storage converter 30 is disconnected from the battery stack 10 and the load 40 respectively, and the battery stack 10 supplies power to the load 40 through the first energy storage converter 20.

[0021] In some embodiments, the first energy storage converter 20 is disconnected from the battery stack 10, the load 40 and the photovoltaic panel 50 respectively, so that the maintenance process of the first energy storage converter 20 does not affect the normal operation of other devices in the energy storage system, which is beneficial to the maintenance of the first energy storage converter 20.

[0022] In some embodiments, the second energy storage converter 30 is disconnected from the battery stack 10 and the load 40 respectively, so that the maintenance process of the second energy storage converter 30 does not affect the normal operation of other devices in the energy storage system, which is beneficial to the maintenance of the second energy storage converter 30.

[0023] In some embodiments, maintenance of the first energy storage converter 20 includes maintenance of the first energy storage converter 20 due to a fault, maintenance of the first energy storage converter 20 due to routine maintenance, etc.

[0024] In some embodiments, maintenance of the second energy storage converter 30 includes maintenance of the second energy storage converter 30 due to a fault, maintenance of the second energy storage converter 30 due to routine maintenance, etc.

[0025] In some embodiments, the energy storage system includes two power conversion systems (PCS), namely a first power conversion system 20 and a second power conversion system 30. When the energy storage system is operating normally, the photovoltaic panel 50 charges the battery stack 10 through the first power conversion system 20, and the battery stack 10 supplies power to the load 40 through the second power conversion system 30.

[0026] In some embodiments, the battery stack 10 includes a plurality of battery clusters, each battery cluster including a plurality of batteries, and each battery including a plurality of cells (i.e., individual cells).

[0027] In some embodiments, photovoltaic panel 50 is a solar panel used to convert sunlight into electrical energy.

[0028] In some embodiments, when the first energy storage converter 20 is under maintenance, the second energy storage converter 30 is connected to the battery stack 10 and the load 40 respectively; when the second energy storage converter 30 is under maintenance, the first energy storage converter 20 is connected to the battery stack 10 and the load 40 respectively.

[0029] In this embodiment, the battery stack 10 is connected to the first energy storage converter 20 and the second energy storage converter 30, respectively. The first energy storage converter 20 is connected to the load 40 and the photovoltaic panel 50, respectively. The photovoltaic panel 50 charges the battery stack 10 through the first energy storage converter 20 to supplement the battery stack 10's power. The second energy storage converter 30 is connected to the load 40. Therefore, when the first energy storage converter 20 is under maintenance, the first energy storage converter 20 is connected to the battery stack 10, the load 40, and the photovoltaic panel 50 respectively. The plate 50 is disconnected, allowing the battery stack 10 to supply power to the load 40 through the second energy storage converter 30. In the event of maintenance of the second energy storage converter 30, the second energy storage converter 30 is disconnected from both the battery stack 10 and the load 40, allowing the battery stack 10 to supply power to the load 40 through the first energy storage converter 20. This ensures normal power supply to the load 40 even during maintenance within the energy storage system, which improves the user's power experience compared to related technologies where the load power supply is interrupted during maintenance within the energy storage system.

[0030] In some embodiments, the first energy storage converter 20 is also used to connect to the power grid 60, which is used to charge the battery stack 10 through the first energy storage converter 20; wherein, in the event of maintenance of the first energy storage converter 20 or the second energy storage converter 30, the first energy storage converter 20 is disconnected from the power grid 60 respectively.

[0031] Optional, refer to Figure 2 In some embodiments, the energy storage system further includes a first switching device K1, a second switching device K2, a third switching device K3, and a fourth switching device K4; the first switching device K1 is connected to the first energy storage converter 20, the second energy storage converter 30, and the load 40, respectively; the second switching device K2 is connected to the first energy storage converter 20 and the battery stack 10, respectively; the third switching device K3 is connected to the first energy storage converter 20 and the photovoltaic panel 50, respectively; and the fourth switching device K4 is connected to the second energy storage converter 30 and the battery stack 10, respectively; wherein, in the first energy storage converter... When the second energy storage converter 20 is under maintenance, the first switching device K1 connects the load 40 and the second energy storage converter 30, while disconnecting the load 40 from the first energy storage converter 20. The second switching device K2 and the third switching device K3 are both disconnected, and the fourth switching device K4 is turned on. When the second energy storage converter 30 is under maintenance, the first switching device K1 connects the load 40 and the first energy storage converter 20, while disconnecting the load 40 from the second energy storage converter 30. The second switching device K2 and the third switching device K3 are both turned on, and the fourth switching device K4 is disconnected.

[0032] In some embodiments, the first switching device K1 may be an automatic transfer switch (ATS), a static transfer switch (STS), or other types of switching devices.

[0033] In some embodiments, the type of the second switching device K2 includes a circuit breaker, a disconnecting switch, or other types of switching devices.

[0034] In some embodiments, the type of the third switching device K3 includes a circuit breaker, a disconnecting switch, or other types of switching devices.

[0035] In some embodiments, the fourth switching device K4 may be a circuit breaker, a disconnecting switch, or other types of switching devices.

[0036] In some embodiments, the first terminal of the first switching device K1 is connected to the power supply terminal of the load 40, the second terminal of the first switching device K1 is connected to the first terminal of the second energy storage converter 30, and the third terminal of the first switching device K1 is connected to the first terminal of the first energy storage converter 20; the first terminal of the second switching device K2 is connected to the second terminal of the first energy storage converter 20, and the second terminal of the second switching device K2 is connected to the positive terminal of the battery stack 10; the first terminal of the third switching device K3 is connected to the output terminal of the photovoltaic panel 50, and the second terminal of the third switching device K3 is connected to the third terminal of the first energy storage converter 20; the first terminal of the fourth switching device K4 is connected to the second terminal of the second energy storage converter 30, and the second terminal of the fourth switching device K4 is connected to the positive terminal of the battery stack 10; the negative terminal of the battery stack 10 is grounded.

[0037] In this embodiment, when the first energy storage converter 20 is under maintenance, the first switching device K1 connects the load 40 and the second energy storage converter 30 while disconnecting the load 40 from the first energy storage converter 20. The second switching device K2 and the third switching device K3 are both disconnected, and the fourth switching device K4 is turned on, so that the first energy storage converter 20 is disconnected from the battery stack 10, the load 40, and the photovoltaic panel 50, respectively, and the second energy storage converter 30 is connected to the battery stack 10 and the load 40, respectively. When the second energy storage converter 30 is under maintenance, the first switching device K1 connects the load 40 and the first energy storage converter 20 while disconnecting the load 40 from the second energy storage converter 30. The second switching device K2 and the third switching device K3 are both turned on, and the fourth switching device K4 is turned off, so that the first energy storage converter 20 is connected to the battery stack 10 and the load 40, respectively, and the second energy storage converter 30 is disconnected from the battery stack 10 and the load 40, respectively.

[0038] In some embodiments, when it is necessary to stop supplying power to the load 40, the first switching device K1 is disconnected, that is, the first end of the first switching device K1 is connected to the floating end of the first switching device K1.

[0039] In some embodiments, the energy storage system further includes a first fuse F1 and a seventh switching device K7; the first fuse F1 is connected to the second switching device K2, the fourth switching device K4 and the seventh switching device K7 respectively, and the seventh switching device K7 is connected to the battery stack 10; wherein, the first fuse F1 is used for overcurrent protection, and the seventh switching device K7 is used to control the charging and discharging of the battery stack 10, that is, when the seventh switching device K7 is turned on, the charging and discharging of the battery stack 10 is turned off; when the seventh switching device K7 is turned off, the charging and discharging of the battery stack 10 is turned off; when the battery stack 10 is under maintenance, the seventh switching device K7 is turned off.

[0040] In some embodiments, a fuse is a circuit breaker.

[0041] In some embodiments, the first end of the first fuse F1 is connected to the second end of the second switching device K2 and the second end of the fourth switching device K4, the second end of the first fuse F1 is connected to the first end of the seventh switching device K7, and the second end of the seventh switching device K7 is connected to the positive electrode of the battery stack 10.

[0042] Optionally, in some embodiments, the energy storage system further includes a fifth switching device K5; the fifth switching device K5 is connected to the first switching device K1 and the power grid 60 respectively; wherein, in the event of maintenance of the battery stack 10, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30, the second switching device K2 and the fourth switching device K4 are both disconnected, and the fifth switching device K5 is turned on to supply power to the load 40 through the power grid 60.

[0043] In some embodiments, the fifth switching device K5 may be a circuit breaker, a disconnecting switch, or other types of switching devices.

[0044] In some embodiments, battery stack 10 maintenance includes maintenance of battery stack 10 due to malfunction, maintenance of battery stack 10 due to routine maintenance, etc.

[0045] In this embodiment, when the battery stack 10 is under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30. The second switching device K2 and the fourth switching device K4 are both disconnected, and the fifth switching device K5 is turned on, so that the load 40 is powered through the power grid 60, thereby ensuring that the load 40 is powered normally when the battery stack 10 is under maintenance.

[0046] In some embodiments, the energy storage system further includes a seventh switching device K7. When the battery stack 10 is under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30. The seventh switching device K7 is disconnected, and the fifth switching device K5 is turned on, so as to supply power to the load 40 through the power grid 60, thereby ensuring normal power supply to the load 40 when the battery stack 10 is under maintenance.

[0047] Optionally, in some embodiments, the fifth switching device K5 is also connected to the first energy storage converter 20; the power grid 60 is used to charge the battery stack 10 through the first energy storage converter 20; wherein, when the first energy storage converter 20 is under maintenance, the fifth switching device K5 is disconnected; when the second energy storage converter 30 is under maintenance, the fifth switching device K5 is turned on.

[0048] In some embodiments, in the event of an abnormality in the power grid 60, the fifth switching device K5 is disconnected to prevent the abnormal power grid 60 from affecting the energy storage system and the load 40; the abnormality in the power grid 60 includes power outages in the power grid 60 or abnormal voltage or current in the power grid 60.

[0049] In this embodiment, when the first energy storage converter 20 is under maintenance, the fifth switching device K5 is disconnected, thus disconnecting the first energy storage converter 20 from the power grid 60; when the second energy storage converter 30 is under maintenance, the fifth switching device K5 is turned on, thus enabling the power grid 60 to supply power to the load 40, and the power grid 60 to charge the battery stack 10 through the first energy storage converter 20.

[0050] Optionally, in some embodiments, the energy storage system further includes a sixth switching device K6; the sixth switching device K6 is connected to the first switching device K1, the fifth switching device K5, and the first energy storage converter 20 respectively; wherein, when both the first energy storage converter 20 and the second energy storage converter 30 are under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30, the second switching device K2, the third switching device K3, the fourth switching device K4, and the sixth switching device K6 are all disconnected, and the fifth switching device K5 is turned on, so as to supply power to the load 40 through the power grid 60.

[0051] In some embodiments, the type of the sixth switching device K6 includes a circuit breaker, a disconnecting switch, or other types of switching devices.

[0052] In this embodiment of the application, when both the first energy storage converter 20 and the second energy storage converter 30 are under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30. The second switching device K2, the third switching device K3, the fourth switching device K4, and the sixth switching device K6 are all disconnected, and the fifth switching device K5 is turned on, so that the load 40 is powered through the power grid 60, thereby ensuring normal power supply to the load 40 when both the first energy storage converter 20 and the second energy storage converter 30 are under maintenance.

[0053] In some embodiments, the first end of the fifth switching device K5 is connected to the power supply end of the power grid 60, the second end of the fifth switching device K5 is connected to the third end of the first switching device K1 and the first end of the sixth switching device K6 respectively; the first end of the sixth switching device K6 is connected to the third end of the first switching device K1, and the second end of the sixth switching device K6 is connected to the first end of the first energy storage converter 20.

[0054] In some embodiments, when the first terminal of the first switching device K1 is connected to the second terminal of the first switching device K1, the load 40 is connected to the second energy storage converter 30, and the load 40 is disconnected from the fifth switching device K5 and the sixth switching device K6; when the first terminal of the first switching device K1 is connected to the third terminal of the first switching device K1, the load 40 is disconnected from the second energy storage converter 30, and the load 40 is connected to the fifth switching device K5 and the sixth switching device K6.

[0055] Optionally, in some embodiments, during a preset time period, both the second switching device K2 and the fifth switching device K5 are turned on, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20; wherein, during the preset time period, the electricity price of the power grid 60 is less than the electricity price threshold.

[0056] In some embodiments, during a period outside a preset time period, the electricity price of the power grid 60 is greater than or equal to an electricity price threshold.

[0057] In some embodiments, the preset time period is the nighttime period, for example, the preset time period is from midnight to 5 a.m.

[0058] In some embodiments, during rainy weather, both the second switching device K2 and the fifth switching device K5 are turned on during a preset time period, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20.

[0059] In this embodiment, since the electricity price of the power grid 60 is less than the electricity price threshold during a preset time period, the second switching device K2 and the fifth switching device K5 are both turned on during the preset time period, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20. Compared with the method of manually switching by the staff to make the power grid 60 charge the battery stack 10 during the preset time period, the staff's work efficiency is improved while saving electricity costs.

[0060] In some embodiments, the energy storage system further includes a sixth switching device K6 and a seventh switching device K7. During a preset time period, the second switching device K2, the fifth switching device K5, the sixth switching device K6, and the seventh switching device K7 are all turned on, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20.

[0061] Optionally, in some embodiments, during the preset time period, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30, so that the load 40 is powered by the power grid 60.

[0062] In this embodiment, since the electricity price of the power grid 60 is less than the electricity price threshold during a preset time period, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30 during the preset time period, so that the power grid 60 supplies power to the load 40. Compared with the method of manually switching by the staff to make the power grid 60 supply power to the load 40 during the preset time period, the work efficiency of the staff is improved while saving electricity costs.

[0063] Optionally, in some embodiments, the energy storage system further includes a battery management system; the battery management system is connected to the battery stack 10, the first energy storage converter 20, and the second energy storage converter 30, respectively. The battery management system is used to disconnect the first energy storage converter 20 from the battery stack 10, the load 40, and the photovoltaic panel 50 when the first energy storage converter 20 is under maintenance, and to allow the battery stack 10 to supply power to the load 40 through the second energy storage converter 30; and to disconnect the second energy storage converter 30 from the battery stack 10 and the load 40 when the second energy storage converter 30 is under maintenance, and to allow the battery stack 10 to supply power to the load 40 through the first energy storage converter 20. The specific implementation process is similar to that described above and will not be repeated here.

[0064] In some embodiments, the battery management system is used to control the on and off states of the first switching device K1, the second switching device K2, the third switching device K3, the fourth switching device K4, the fifth switching device K5, the sixth switching device K6, and the seventh switching device K7, respectively. The specific implementation process is similar to that described above and will not be repeated here.

[0065] In some embodiments, the Battery Management System (BMS) includes a Battery System Management Unit (BSMU), multiple Battery Cluster Management Units (BCMUs), and multiple Battery Management Units (BMUs). Each BCMU has a corresponding set of Battery Management Units; each Battery Management Unit has a corresponding battery; the BSMU communicates with each BCMU, and each BCMU communicates with each corresponding Battery Management Unit; each Battery Management Unit collects voltage, temperature, and other data for each cell in the battery corresponding to its own Battery Management Unit and performs passive balancing; wherein, the BSMU controls the switching on and off of the first switching device K1, the second switching device K2, the third switching device K3, the fourth switching device K4, the fifth switching device K5, the sixth switching device K6, and the seventh switching device K7, respectively. The specific implementation process is similar to that described above and will not be repeated here.

[0066] In some embodiments, in response to a maintenance command of the first energy storage converter 20, the battery management system disconnects the first energy storage converter 20 from the battery stack 10, the load 40, and the photovoltaic panel 50, respectively, and enables the battery stack 10 to supply power to the load 40 through the second energy storage converter 30; in response to a maintenance command of the second energy storage converter 30, the battery management system disconnects the second energy storage converter 30 from the battery stack 10 and the load 40, respectively, and enables the battery stack 10 to supply power to the load 40 through the first energy storage converter 20, thereby providing normal power supply to the load 40 during maintenance within the energy storage system.

[0067] In this embodiment, when the first energy storage converter 20 is under maintenance, the battery management system disconnects the first energy storage converter 20 from the battery stack 10, the load 40, and the photovoltaic panel 50, respectively, and allows the battery stack 10 to supply power to the load 40 through the second energy storage converter 30. When the second energy storage converter 30 is under maintenance, the second energy storage converter 30 is disconnected from the battery stack 10 and the load 40, respectively, and allows the battery stack 10 to supply power to the load 40 through the first energy storage converter 20, thereby providing normal power supply to the load 40 during maintenance within the energy storage system.

[0068] In some embodiments, the battery management system is further configured to control the power grid 60 to supply power to the load 40 when the battery stack 10 is under maintenance, so as to ensure normal power supply to the load 40 when the battery stack 10 is under maintenance.

[0069] In some embodiments, the battery management system is also used to connect the load 40 to the fifth switch device K5 and disconnect the load 40 from the second energy storage converter 30 through the first switch device K1 when the battery stack 10 is under maintenance, disconnect the second switch device K2 and the fourth switch device K4, and turn on the fifth switch device K5 so as to supply power to the load 40 through the power grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0070] In some embodiments, in response to a maintenance command of the battery stack 10, the battery management system connects the load 40 to the fifth switch K5 and disconnects the load 40 from the second energy storage converter 30 via the first switch K1, disconnects the second switch K2 and the fourth switch K4, and turns on the fifth switch K5.

[0071] In some embodiments, the battery management system is further configured to, when both the first energy storage converter 20 and the second energy storage converter 30 are under maintenance, connect the load 40 to the fifth switch device K5 and disconnect the load 40 from the second energy storage converter 30 via the first switch device K1, disconnect the second switch device K2, the third switch device K3, the fourth switch device K4, and the sixth switch device K6, and turn on the fifth switch device K5 to supply power to the load 40 through the power grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0072] In some embodiments, in response to a simultaneous maintenance command of the first energy storage converter 20 and the second energy storage converter 30, the battery management system connects the load 40 to the fifth switch device K5 and disconnects the load 40 from the second energy storage converter 30 via the first switch device K1, disconnects the second switch device K2, the third switch device K3, the fourth switch device K4, and the sixth switch device K6, and turns on the fifth switch device K5 to supply power to the load 40 through the power grid 60.

[0073] In some embodiments, the battery management system is also used to turn on both the second switching device K2 and the fifth switching device K5 during a preset time period, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20. The specific implementation process is similar to that described above and will not be repeated here.

[0074] In some embodiments, the battery management system is also used to connect the load 40 to the fifth switch K5 and disconnect the load 40 from the second energy storage converter 30 through the first switch K1 during a preset time period, so as to supply power to the load 40 through the grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0075] In some embodiments, the energy storage system further includes a second fuse F2 and a voltage detection chip U1. The second fuse F2 is connected to the fifth switching device K5 and the voltage detection chip U1, respectively. The voltage detection chip U1 is connected to the battery management system. The voltage detection chip U1 is used to collect the voltage of the power grid 60 when the fifth switching device K5 is turned on, so that the battery management system can disconnect the fifth switching device K5 when the voltage of the power grid 60 is abnormal. The second fuse F2 is used for overcurrent protection.

[0076] In some embodiments, the first end of the second fuse F2 is connected to the second end of the fifth switching device K5, the second end of the second fuse F2 is connected to the input end of the voltage detection chip U1, and the output end of the voltage detection chip U1 is connected to the acquisition end of the battery management system.

[0077] In some embodiments, when the second switch device K2, the fifth switch device K5, the sixth switch device K6 and the seventh switch device K7 are all turned on, the battery stack 10 supplies electrical energy to the power grid 60, and when the third switch device K3 is turned on, the photovoltaic panel 50 supplies electrical energy to the power grid 60.

[0078] Optionally, in some embodiments, the energy storage system is housed within the same enclosure 70.

[0079] In some embodiments, the battery stack 10, the first energy storage converter 20, the second energy storage converter 30, the first switching device K1, the second switching device K2, the third switching device K3, the fourth switching device K4, the fifth switching device K5, the sixth switching device K6, the seventh switching device K7, the first fuse F1, the second fuse F2, and the voltage detection chip U1 are all housed in the same enclosure 70.

[0080] In some embodiments, the enclosure 70 is provided with a load port 40, a photovoltaic panel port 50, and a grid port 60. The power supply end of the load 40 is connected to the first terminal of the first switching device K1 through the load port 40. The output end of the photovoltaic panel 50 is connected to the first terminal of the third switching device K3 through the photovoltaic panel port 50. The power supply end of the grid 60 is connected to the first terminal of the fifth switching device K5 through the grid port 60. The integrated design of the energy storage system and the wiring of the equipment can be completed in the factory. The load port 40, photovoltaic panel port 50, and grid port 60 are reserved for external use to facilitate on-site use.

[0081] In this embodiment of the application, by setting the energy storage system in the same box 70, it is beneficial to on-site installation and maintenance, and saves installation and maintenance time and space.

[0082] Figure 3 This application provides a power supply method that is applied to the aforementioned energy storage system, such as... Figure 3As shown, the method may include the following steps: Step 101: When the first energy storage converter 20 is under maintenance, disconnect the first energy storage converter 20 from the battery stack 10, the load 40 and the photovoltaic panel 50 respectively, and make the battery stack 10 supply power to the load 40 through the second energy storage converter 30.

[0083] The implementation method for this step is similar to the aforementioned process, and will not be repeated here.

[0084] Step 102: When the second energy storage converter 30 is under maintenance, disconnect the second energy storage converter 30 from the battery stack 10 and the load 40 respectively, and make the battery stack 10 supply power to the load 40 through the first energy storage converter 20.

[0085] The implementation method for this step is similar to the aforementioned process, and will not be repeated here.

[0086] In some embodiments, the method further includes the following steps: Step 103: When the battery stack 10 is under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30. The second switching device K2 and the fourth switching device K4 are both disconnected, and the fifth switching device K5 is turned on so that the load 40 is powered through the power grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0087] In some embodiments, the method further includes the following steps: Step 104: When both the first energy storage converter 20 and the second energy storage converter 30 are under maintenance, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30. The second switching device K2, the third switching device K3, the fourth switching device K4, and the sixth switching device K6 are all disconnected, and the fifth switching device K5 is turned on so that the load 40 is powered through the power grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0088] In some embodiments, the method further includes the following steps: Step 105: During a preset time period, both the second switching device K2 and the fifth switching device K5 are turned on, so that the power grid 60 charges the battery stack 10 through the first energy storage converter 20. The specific implementation process is similar to that described above and will not be repeated here.

[0089] In some embodiments, the method further includes the following steps: Step 106: During a preset time period, the first switching device K1 connects the load 40 to the fifth switching device K5 and disconnects the load 40 from the second energy storage converter 30, so that the load 40 is powered by the power grid 60. The specific implementation process is similar to that described above and will not be repeated here.

[0090] In related technologies, the various components in the energy storage system are arranged separately, requiring on-site assembly, which increases the on-site installation process and is inconvenient for maintenance.

[0091] In this embodiment, the PCS, battery stack 10, and switching devices are integrated into a single design, saving construction and maintenance time and improving the convenience of operation and maintenance of the energy storage converter.

[0092] In some embodiments, the energy storage system includes an Energy Management System (EMS) connected to a Battery Management System (BMS). The EMS controls the power switching of the load 40. The BMS detects the battery stack 10 and reports any faults in the battery stack 10 to the EMS. The EMS then issues a command to the BMS, which switches the power supply of the load 40 from the battery stack 10 to the grid 60. In other embodiments, to improve the power switching efficiency of the load, the power switching of the load 40 can be directly controlled by the BMS, without the need for the EMS to control it. That is, the BMS detects the battery stack 10 and switches the power supply of the load 40 from the battery stack 10 to the grid 60 in the event of a fault in the battery stack 10.

[0093] In this embodiment, to ensure the reliable operation of load 40, the mains power grid 60 and the energy storage system serve as backup power sources for each other, prioritizing the operation of load 40. The grid 60 and photovoltaic system are used as power sources; when there is sufficient sunshine or the electricity price on the grid 60 is at its lowest point, the battery stack 10 is charged. When the battery stack 10 unexpectedly fails and shuts down, the BMS directly controls the ATS to switch to the backup circuit, and the grid 60 supplies power to load 40. This shortens processing time, improves control speed, and makes processing more timely. Furthermore, through the coordination of switching devices, it is beneficial to ensure the continuous operation of load 40 during maintenance of single faults such as the PCS or battery stack 10.

[0094] In summary, in this embodiment, since the battery stack 10 is connected to the first energy storage converter 20 and the second energy storage converter 30 respectively, and the first energy storage converter 20 is connected to the load 40 and the photovoltaic panel 50 respectively, wherein the photovoltaic panel 50 charges the battery stack 10 through the first energy storage converter 20 to supplement the battery stack 10's power, and the second energy storage converter 30 is connected to the load 40, then when the first energy storage converter 20 is under maintenance, the first energy storage converter 20 is connected to the battery stack 10 and the load 40 respectively. The system disconnects the photovoltaic panel 50, allowing the battery stack 10 to supply power to the load 40 through the second energy storage converter 30. Furthermore, in the event of maintenance of the second energy storage converter 30, the second energy storage converter 30 is disconnected from both the battery stack 10 and the load 40, allowing the battery stack 10 to supply power to the load 40 through the first energy storage converter 20. This ensures normal power supply to the load 40 even during maintenance within the energy storage system, improving the user's electricity experience compared to related technologies where power supply to the load is interrupted during maintenance within the energy storage system.

[0095] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0096] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An energy storage system, characterized in that, include: Battery stack (10), first energy storage converter (20), and second energy storage converter (30); The battery stack (10) is connected to the first energy storage converter (20) and the second energy storage converter (30) respectively; The first energy storage converter (20) is used to connect to the load (40) and the photovoltaic panel (50) respectively; the photovoltaic panel (50) is used to charge the battery stack (10) through the first energy storage converter (20); The second energy storage converter (30) is used to connect to the load (40); In the case of maintenance of the first energy storage converter (20), the first energy storage converter (20) is disconnected from the battery stack (10), the load (40) and the photovoltaic panel (50) respectively, and the battery stack (10) supplies power to the load (40) through the second energy storage converter (30); in the case of maintenance of the second energy storage converter (30), the second energy storage converter (30) is disconnected from the battery stack (10) and the load (40) respectively, and the battery stack (10) supplies power to the load (40) through the first energy storage converter (20).

2. The energy storage system according to claim 1, characterized in that, The energy storage system also includes a first switching device (K1), a second switching device (K2), a third switching device (K3), and a fourth switching device (K4). The first switching device (K1) is connected to the first energy storage converter (20), the second energy storage converter (30), and the load (40) respectively; the second switching device (K2) is connected to the first energy storage converter (20) and the battery stack (10) respectively; the third switching device (K3) is connected to the first energy storage converter (20) and the photovoltaic panel (50) respectively; the fourth switching device (K4) is connected to the second energy storage converter (30) and the battery stack (10) respectively. In the case of maintenance of the first energy storage converter (20), the load (40) and the second energy storage converter (30) are connected by the first switching device (K1) and the load (40) is disconnected from the first energy storage converter (20). The second switching device (K2) and the third switching device (K3) are both disconnected, and the fourth switching device (K4) is turned on. In the case of maintenance of the second energy storage converter (30), the load (40) and the first energy storage converter (20) are connected by the first switching device (K1) and the load (40) is disconnected from the second energy storage converter (30). The second switching device (K2) and the third switching device (K3) are both turned on, and the fourth switching device (K4) is disconnected.

3. The energy storage system according to claim 2, characterized in that, The energy storage system also includes a fifth switching device (K5). The fifth switching device (K5) is connected to the first switching device (K1) and the power grid (60) respectively; In the case of maintenance of the battery stack (10), the first switching device (K1) connects the load (40) to the fifth switching device (K5) and disconnects the load (40) from the second energy storage converter (30). The second switching device (K2) and the fourth switching device (K4) are both disconnected, and the fifth switching device (K5) is turned on so as to supply power to the load (40) through the power grid (60).

4. The energy storage system according to claim 3, characterized in that, The fifth switching device (K5) is also connected to the first energy storage converter (20); the power grid (60) is used to charge the battery stack (10) through the first energy storage converter (20); When the first energy storage converter (20) is under maintenance, the fifth switching device (K5) is disconnected; when the second energy storage converter (30) is under maintenance, the fifth switching device (K5) is turned on.

5. The energy storage system according to claim 4, characterized in that, The energy storage system also includes a sixth switching device (K6). The sixth switching device (K6) is connected to the first switching device (K1), the fifth switching device (K5) and the first energy storage converter (20) respectively; In the case where both the first energy storage converter (20) and the second energy storage converter (30) are under maintenance, the first switching device (K1) connects the load (40) to the fifth switching device (K5) and disconnects the load (40) from the second energy storage converter (30). The second switching device (K2), the third switching device (K3), the fourth switching device (K4), and the sixth switching device (K6) are all disconnected, and the fifth switching device (K5) is turned on, so as to supply power to the load (40) through the power grid (60).

6. The energy storage system according to claim 4, characterized in that, During a preset time period, both the second switching device (K2) and the fifth switching device (K5) are turned on, so that the power grid (60) charges the battery stack (10) through the first energy storage converter (20); During the preset time period, the electricity price of the power grid (60) is less than the electricity price threshold.

7. The energy storage system according to claim 6, characterized in that, During the preset time period, the first switching device (K1) connects the load (40) to the fifth switching device (K5) and disconnects the load (40) from the second energy storage converter (30) so that the load (40) is powered by the power grid (60).

8. The energy storage system according to any one of claims 1 to 7, characterized in that, The energy storage system also includes a battery management system; The battery management system is connected to the battery stack (10), the first energy storage converter (20), and the second energy storage converter (30) respectively. When the first energy storage converter (20) is under maintenance, the battery management system disconnects the first energy storage converter (20) from the battery stack (10), the load (40), and the photovoltaic panel (50) respectively, and enables the battery stack (10) to supply power to the load (40) through the second energy storage converter (30); when the second energy storage converter (30) is under maintenance, the second energy storage converter (30) disconnects the second energy storage converter (30) from the battery stack (10) and the load (40) respectively, and enables the battery stack (10) to supply power to the load (40) through the first energy storage converter (20).

9. The energy storage system according to claim 8, characterized in that, The battery management system is also used to control the power grid (60) to supply power to the load (40) in the event of maintenance of the battery stack (10).

10. A power supply method, characterized in that, Applied to the energy storage system as described in any one of claims 1 to 9, the method comprises: In the event of maintenance of the first energy storage converter (20), the first energy storage converter (20) is disconnected from the battery stack (10), the load (40) and the photovoltaic panel (50) respectively, and the battery stack (10) supplies power to the load (40) through the second energy storage converter (30); In the event of maintenance of the second energy storage converter (30), the second energy storage converter (30) is disconnected from the battery stack (10) and the load (40) respectively, and the battery stack (10) supplies power to the load (40) through the first energy storage converter (20).

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