Energy-saving methods, energy storage devices, energy storage systems, and charging networks

Abstract

This application provides an energy-saving method, an energy storage device, an energy storage system, and a charging network. In this method, the energy storage device includes a battery management unit and at least one energy storage unit. When the energy storage device is determined to be in a circuit-off state based on parameters indicating its operating state, the battery management unit can send a command to the battery monitoring circuit in the energy storage unit. This command instructs the analog front-end chip in the battery monitoring circuit to switch from an active state to a dormant state. Since the operation of the analog front-end chip requires power from the battery device in the energy storage unit, when the analog front-end chip switches from an active state to a dormant state, it will no longer draw power from the battery device. This reduces the power consumption of the analog front-end chip on individual battery cells, thereby reducing the stored power consumed when the energy storage device is in a circuit-off state.

Description

[0001] This application is a divisional application of the invention application filed on September 3, 2025, with Chinese application number 202511248908.9 and entitled "Energy Saving Method, Energy Storage Device, Energy Storage System and Charging Network". Technical Field

[0002] This application relates to the field of energy storage technology, and more specifically, to an energy-saving method, an energy storage device, an energy storage system, and a charging network. Background Technology

[0003] Energy storage devices are devices that store surplus energy and release it during peak electricity demand periods. They can be used to resolve the temporal and spatial contradictions between energy supply and demand, as well as improve the stability and efficiency of energy systems.

[0004] To increase the total duration of external power supply from energy storage devices, these devices can be disconnected from the power grid or load when not in use. Currently, however, energy storage devices continue to consume stored energy even when disconnected, thus shortening the total duration of external power supply. Therefore, reducing the energy consumption of energy storage devices when disconnected is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] This application provides an energy-saving method, an energy storage device, an energy storage system, and a charging network, which can reduce the amount of stored electricity consumed when the energy storage device is in a circuit-off state.

[0006] In a first aspect, an energy-saving method is provided, the method comprising: acquiring first information, the first information including parameters for indicating the operating state of an energy storage device, the energy storage device including at least one energy storage unit, the at least one energy storage unit including a first energy storage unit, the first energy storage unit including a first cell supervision circuit (CSC) and at least one first battery device, the first CSC including a first analog front end (AFE) chip, the first AFE chip being electrically connected to at least one first battery device, the operating state of the energy storage device being determined by referring to information of each energy storage unit in the at least one energy storage unit; when it is determined according to the first information that the energy storage device is in a circuit-off state, sending a first instruction to the first CSC, the first instruction being used to instruct the first AFE chip to switch from an operating state to a sleep state.

[0007] Since the operation of the first AFE chip requires power from the first battery device, when the first AFE chip switches from the working state to the sleep state, the first AFE chip will not continue to obtain power from the first battery device. This can reduce the power consumption of the first AFE chip on the first battery device, thereby reducing the stored power consumed when the energy storage device is in the circuit disconnected state.

[0008] Specifically, when the energy storage device is in a circuit-disconnected state, the AFE chip in the energy storage device can stop working. Therefore, by instructing the AFE chip to switch from the working state to the dormant state when the energy storage device is in a circuit-disconnected state, the power consumption of the AFE chip to the battery device corresponding to the AFE chip can be reduced, thereby reducing the stored power consumed when the energy storage device is in a circuit-disconnected state.

[0009] One possible implementation is that the first information includes at least one of the following: the output voltage value of the first energy storage unit, the output current value of the first energy storage unit, the fault code of the energy storage device, the balancing function status information of the first CSC, or a second instruction used to instruct the first CSC to switch from an operating state to a dormant state. Thus, this can support determining the operating state of the energy storage device based on one or more of the above information.

[0010] One possible implementation, as described above, of determining that the energy storage device is in a circuit-disconnected state based on the first information, includes: determining that the energy storage device is in a circuit-disconnected state when the energy storage device meets at least one of the following first conditions based on the first information. The first conditions are: the output current value of the first energy storage unit is less than or equal to a first current threshold; the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold; the equalization function of the first CSC is in a deactivated state; or, the fault code of the energy storage device does not include a power output disconnection fault code. Thus, by setting one or more of the above conditions to determine whether the energy storage device is in a circuit-disconnected state, the accuracy of determining whether the energy storage device is in a circuit-disconnected state can be improved.

[0011] One possible implementation, whereby determining that the energy storage device is in a circuit-disconnected state based on the first information includes: determining that the energy storage device is in a circuit-disconnected state when the duration of satisfying the first condition met by the energy storage device is T time units, where T is a positive integer. Thus, by setting the feature of T time units, the reliability of determining that the energy storage device is in a circuit-disconnected state can be improved.

[0012] One possible implementation further includes: receiving second information from a first CSC, the second information indicating that the first AFE chip has switched from an operating state to a sleep state; and sending a third instruction to the first CSC based on the second information, the third instruction instructing the first CSC to switch from an operating state to a sleep state. Thus, when it is determined that the first AFE chip is in a sleep state, the first CSC can be instructed to switch from an operating state to a sleep state, which can further reduce the power consumption of the energy storage device when the circuit is disconnected.

[0013] One possible implementation method further includes stopping power supply to the first CSC. This could further reduce the amount of stored energy consumed by the energy storage device when the circuit is disconnected.

[0014] One possible implementation, the method further includes: sending a fourth instruction to the first CSC when it is determined that the energy storage device meets any one of the following second conditions, the fourth instruction being used to instruct the first CSC to switch from a dormant state to an active state. The second conditions include: receiving a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from a circuit disconnected state to a circuit connected state; the output current value of the first energy storage unit at a first moment being greater than or equal to a second current threshold, the first moment being after the moment when the first CSC was in a dormant state; the output voltage value of the first energy storage unit at a second moment being greater than or equal to a second voltage threshold, the second moment being after the moment when the first CSC was in a dormant state; receiving a sixth instruction, the sixth instruction being used to instruct the first CSC to switch from a dormant state to an active state; the dormant duration of the first CSC being greater than or equal to K time units, where K is a positive integer; or receiving a power output disconnection fault code from the energy storage device. By setting the second conditions, this enables the first CSC to switch from a dormant state to an active state, and thus enables the first CSC to switch between dormant and active states.

[0015] One possible implementation is that the first instruction is used to instruct the first AFE chip to switch from an operating state to a sleep state, including: the first instruction is used to instruct the first AFE chip to stop performing sampling functions on at least one first battery device, and / or, the first instruction is used to instruct the first AFE chip to stop performing equalization functions on at least one first battery device.

[0016] When the first instruction instructs the first AFE chip to stop sampling the first battery device, the power consumption of the first AFE chip on the first battery device is reduced because the first AFE chip does not need to sample the first battery device. Similarly, when the first instruction instructs the first AFE chip to stop equalizing the first battery device, the power consumption of the first AFE chip on the first battery device is reduced because the first AFE chip does not need to perform equalization. Furthermore, when the first instruction instructs the first AFE chip to stop both sampling and equalization functions on the first battery device, the power consumption of the first AFE chip on the first battery device can be further reduced.

[0017] In one possible implementation, the at least one energy storage unit further includes a second energy storage unit. The second energy storage unit includes a second CSC and at least one second battery device. The second CSC includes a second AFE chip electrically connected to the at least one second battery device. The first information further includes at least one of the following: the output voltage value of the second energy storage unit, the output current value of the second energy storage unit, or the equalization function status information of the second CSC. Thus, information from multiple energy storage units can be used to determine whether the energy storage device is in a circuit-disconnected state, thereby improving the accuracy of determining whether the energy storage device is in a circuit-disconnected state.

[0018] One possible implementation is that the energy storage device does not experience a power output disconnection fault. When the energy storage device does not experience a power output disconnection fault, it indicates that the reason the energy storage device is in a circuit disconnection state is not due to a power output disconnection fault. In this way, the first AFE chip can be instructed to switch from the working state to the sleep state while ensuring the safety of the energy storage device.

[0019] In one possible implementation, when the energy storage device further includes at least one energy storage unit, the first information also includes the balancing function status information of the CSCs in the at least one energy storage unit. Thus, it is possible to determine whether the energy storage device is in a circuit-disconnected state based on the balancing function status information of all CSCs in the energy storage device, which can improve the accuracy of determining whether the energy storage device is in a circuit-disconnected state.

[0020] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0021] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0022] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization and sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0023] In a second aspect, an energy storage device is provided, comprising a battery management unit and at least one energy storage unit, the at least one energy storage unit comprising a first energy storage unit, the first energy storage unit comprising a first CSC and at least one first battery device, the first CSC comprising a first AFE chip, the first AFE chip being connected to at least one first battery device, the operating state of the energy storage device being determined by referring to information of each energy storage unit in the at least one energy storage unit; the battery management unit is configured to: acquire first information, the first information including parameters for indicating the operating state of the energy storage device; and when it is determined according to the first information that the energy storage device is in a battery management unit state, send a first instruction to the first CSC, the first instruction being used to instruct the first AFE chip to switch from an operating state to a dormant state.

[0024] One possible implementation is that the first information includes at least one of the following: the output voltage value of the first energy storage unit, the output current value of the first energy storage unit, the fault code of the energy storage device, the balancing function status information of the first CSC, or a second instruction used to instruct the first CSC to switch from the working state to the dormant state.

[0025] One possible implementation is that the first information includes at least one of the following: the output voltage value of the first energy storage unit, the output current value of the first energy storage unit, the fault code of the energy storage device, the balancing function status information of the first CSC, or a second instruction used to instruct the first CSC to switch from the working state to the dormant state.

[0026] One possible implementation involves the battery management unit determining that the energy storage device is in a circuit-disconnected state based on first information, including: the battery management unit determining that the energy storage device is in a circuit-disconnected state when the energy storage device meets at least one of the following first conditions based on the first information. The first condition is: the output current value of the first energy storage unit is less than or equal to a first current threshold; the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold; the equalization function of the first CSC is in a disabled state; or, the fault codes of the energy storage device do not include a power output disconnection fault code.

[0027] One possible implementation is that the battery management unit determines that the energy storage device is in the battery management unit state based on the first information, including: when it is determined that the duration of the first condition satisfied by the energy storage device is T time units, the battery management unit determines that the energy storage device is in the battery management unit state, where T is a positive integer.

[0028] In one possible implementation, the battery management unit is further configured to: receive second information from the first CSC, the second information indicating that the first AFE chip has switched from the working state to the sleep state; and send a third instruction to the first CSC according to the second information, the third instruction indicating that the first CSC has switched from the working state to the sleep state.

[0029] One possible implementation is that the battery management unit is also used to: stop power supply to the first CSC.

[0030] In one possible implementation, the battery management unit is further configured to: send a fourth instruction to the first CSC when it is determined that the energy storage device meets any one of the following second conditions, the fourth instruction being used to instruct the first CSC to switch from a dormant state to an active state. The second condition includes: receiving a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from a circuit disconnected state to a circuit connected state; the output current value of the first energy storage unit at a first moment being greater than or equal to a second current threshold, the first moment being after the moment when the first CSC is in a dormant state; the output voltage value of the first energy storage unit at a second moment being greater than or equal to a second voltage threshold, the second moment being after the moment when the first CSC is in a dormant state; receiving a sixth instruction, the sixth instruction being used to instruct the first CSC to switch from a dormant state to an active state; the dormant duration of the first CSC being greater than or equal to K time units, where K is a positive integer; or, receiving a power output disconnection fault code from the energy storage device.

[0031] One possible implementation is that the first instruction is used to instruct the first AFE chip to switch from an operating state to a sleep state, including: the first instruction is used to instruct the first AFE chip to stop performing sampling functions on at least one first battery device, and / or, the first instruction is used to instruct the first AFE chip to stop performing equalization functions on at least one first battery device.

[0032] In one possible implementation, the at least one energy storage unit further includes a second energy storage unit, the second energy storage unit including a second CSC and at least one second battery device, the second CSC including a second AFE chip, the second AFE chip being electrically connected to at least one second battery device, and the first information further including at least one of the following: the output voltage value of the second energy storage unit, the output current value of the second energy storage unit, or the equalization function status information of the second CSC.

[0033] One possible implementation is that the energy storage device does not experience a power output disconnection fault. When the energy storage device does not experience a power output disconnection fault, it indicates that the reason the energy storage device is in a circuit disconnection state is not due to a power output disconnection fault. In this way, the battery management unit can instruct the first AFE chip to switch from the working state to the sleep state while ensuring the safety of the energy storage device.

[0034] In one possible implementation, when the energy storage device further includes at least one energy storage unit, the first information also includes the balancing function status information of the CSCs in the at least one energy storage unit. In this way, the battery management unit can determine whether the energy storage device is in a non-high-voltage online state based on the balancing function status information of all CSCs in the energy storage device, which can improve the accuracy of the battery management unit in determining whether the energy storage device is in a circuit-disconnected state.

[0035] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0036] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0037] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization and sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0038] Thirdly, an energy storage device is provided, which includes a processor and a memory, the memory for storing a computer program, and the processor for calling the computer program to execute the methods in the first aspect or its various implementations.

[0039] Fourthly, a battery management unit is provided, the device including a processor and a memory, the memory for storing a computer program, and the processor for calling the computer program to execute the methods in the first aspect or its various implementations described above.

[0040] Fifthly, an energy storage system is provided, comprising a power conversion device and an energy storage device as described in the second aspect or its various implementations, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0041] In a sixth aspect, a charging network is provided, which includes charging piles and an energy storage device as described in the second aspect or its various implementations, the energy storage device being used to provide electrical energy to the charging piles.

[0042] In a seventh aspect, a charging network is provided, which includes charging piles and the energy storage system described in the fourth aspect, wherein the energy storage device is used to provide electrical energy to the charging piles.

[0043] Eighthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its implementations. Attached Figure Description

[0044] Figure 1 This diagram illustrates an application scenario of the energy-saving method according to an embodiment of this application.

[0045] Figure 2 A schematic block diagram of an energy storage device according to an embodiment of this application is shown.

[0046] Figure 3 A schematic flowchart of an energy-saving method 300 according to an embodiment of this application is shown.

[0047] Figure 4 A schematic block diagram of an energy storage device 400 according to an embodiment of this application is shown.

[0048] Figure 5 A schematic diagram of the hardware structure of an energy storage device 500 according to an embodiment of this application is shown. Detailed Implementation

[0049] The embodiments of this application are described below with reference to the accompanying drawings and examples. The following description and drawings of the embodiments are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0050] In the description of this application, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In this application, reference to "embodiment" means that a specific feature or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0053] The following section first explains the terminology related to the embodiments of this application.

[0054] 1. Battery cell A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0055] The battery cell can be a lithium-ion battery, a lithium iron phosphate battery, a nickel-cobalt-manganese ternary battery, a nickel-cobalt-aluminum ternary battery, a sodium-ion lithium 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, a negative electrode-free battery, etc., and this application does not limit it.

[0056] The type of battery cell can also be a stacked battery cell, a pouch battery cell, a prismatic battery cell, or a cylindrical battery cell, etc., and this application does not limit this.

[0057] 2. Battery device A battery device may include at least one battery cell assembly for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or in a mixed configuration via a busbar.

[0058] A battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly is a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0059] The battery device can also be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0060] 3. Energy storage devices Energy storage devices include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When an energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device. The battery cluster can also be understood as the energy storage unit described below.

[0061] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires energy storage devices.

[0062] One possible example is that the energy storage device is an energy storage container or an energy storage cabinet. In the case of an energy storage cabinet, the battery cluster can be understood as the electrical box within the cabinet.

[0063] One possible example is that the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0064] One possible example is that an energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0065] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0066] As an example, the master control module can act as the battery management unit for a battery cluster, used to monitor and manage the cluster. The master control module can monitor information such as current, voltage, power, and temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The master control module includes modules such as a slave battery management unit (SBMU) and a fusion switch. The SBMU is responsible for data integration, status management, safety protection, and communication coordination at the individual battery cell level.

[0067] As an example, the central control module can serve as the battery management unit of an energy storage device, enabling it to monitor and manage the energy storage device. For instance, the central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device, and can also control the charging and discharging current and voltage of the energy storage device.

[0068] As an example, the master control module includes modules such as the insulation monitoring module (IMM), the master battery management unit (MBMU), Ethernet (ETH), and fiber optic conversion module.

[0069] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0070] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0071] As described in the background section, an energy storage device in a disconnected state continues to consume stored energy, gradually reducing its remaining capacity and consequently shortening its total power supply duration. Specifically, when the energy storage device is in a disconnected state, some chips within it remain operational. The battery within the device needs to power these operational chips to maintain their normal operation; therefore, the energy storage device continues to consume stored energy even when the circuit is disconnected. This disconnected state can also be understood as a non-high-voltage online state.

[0072] In view of this, this application provides an energy-saving method. The energy storage device includes a battery management unit and at least one energy storage unit. The at least one energy storage unit includes a first energy storage unit, which can be any one of the at least one energy storage units. The first energy storage unit includes a first CSC and at least one first battery device. The first CSC is used to monitor the parameters of the battery device in real time. The first CSC includes a first AFE chip, which is electrically connected to at least one first battery device. The first AFE chip can include at least one AFE chip, meaning the first CSC includes at least one AFE chip corresponding to at least one first battery device. Alternatively, the first AFE chip can be a single AFE chip electrically connected to at least one first battery device, used to perform sampling functions (such as voltage sampling, current sampling, and temperature sampling) and equalization functions on at least one first battery device. The operating state of the energy storage device is determined by referring to the information of each energy storage unit in the at least one energy storage unit. When the energy storage device is determined to be in a circuit-off state based on the parameters used to indicate the operating state of the energy storage device, the battery management unit sends a first instruction to the first CSC. The first instruction is used to instruct the first AFE chip to switch from the operating state to a dormant state. Since the operation of the first AFE chip requires power from the first battery device, when the first AFE chip switches from the working state to the sleep state, the first AFE chip will no longer obtain power from the first battery device. This can reduce the power consumption of the first AFE chip on the first battery device, thereby reducing the stored power consumed when the energy storage device is in the circuit disconnected state.

[0073] When the energy storage device is in a circuit-disconnected state, the AFE chip can stop working. Therefore, by instructing the AFE chip to switch from the working state to the sleep state when the energy storage device is in a sleep state, it is possible to reduce the power consumption of the battery device that is electrically connected to the AFE chip, thereby reducing the stored power consumed when the energy storage device is in a circuit-disconnected state.

[0074] Figure 1 This diagram illustrates an application scenario of the energy-saving method according to an embodiment of this application. For example... Figure 1 As shown, different electrical devices, such as electric vehicles and trucks, can be charged from a charging network equipped with one or more energy storage devices when needed. This charging network can also be understood as an energy storage station or energy storage site. Each energy storage device includes a control module and at least one energy storage unit. The control module is used to control at least one energy storage unit. For example, the control module is used to perform charge and discharge protection on the energy storage unit based on data from the battery device in the energy storage unit. An example of a control module can be a battery management unit, which can include an SBMU, an MBMU, or a battery management system (BMS), without limitation. For ease of description, the following description uses an SBMU as the battery management unit.

[0075] Figure 2 A schematic block diagram of an energy storage device according to an embodiment of this application is shown. Figure 2 As shown, the energy storage device includes a main control box and at least one energy storage unit, namely energy storage unit 1, ..., energy storage unit n-1 and energy storage unit n (n is a positive integer). Each energy storage unit has a first positive power supply terminal (+) and a first negative power supply terminal (-). At least one energy storage unit is connected in series through the first positive power supply terminal and the first negative power supply terminal. The energy storage device is configured to provide DC power. The main control box includes a main positive relay, a main negative relay, and an SBMU. The main positive relay includes a second positive power supply terminal and a third positive power supply terminal. The main negative relay includes a second negative power supply terminal and a third negative power supply terminal. The third positive power supply terminal of the main positive relay is connected to the first positive power supply terminal of energy storage unit 1. The second positive power supply terminal of the main positive relay is connected to the positive port of an external load device. The third negative power supply terminal of the main negative relay is connected to the first negative power supply terminal of energy storage unit n. The second negative power supply terminal of the main negative relay is connected to the negative port of the external load device to provide DC power. The main positive relay can be used to control the on / off of the high-voltage circuit between the positive power supply terminal of the energy storage unit and the external load device. The main negative relay can be used to control the closed-loop high-voltage circuit between the negative power supply terminal of the energy storage unit and the external load equipment. As an example, the energy storage unit can be an electrical box, and the energy storage device can be an electrical cabinet, with one or more electrical boxes included in the cabinet. Figure 2The SBMU in the code can also be replaced with MBMU or BMS, etc.

[0076] Each of the n energy storage units includes a Control Center (CSC) and at least one battery device, namely: battery device 1, ..., battery device m-1 and battery device m (m is a positive integer). The m battery devices are connected in series. Each CSC includes a microcontroller unit (MCU) and at least one AFE chip, namely: AFE chip 1, ..., AFE chip m-1 and AFE chip m. Each AFE chip is electrically connected to one battery device. The AFE chip can also be used to perform equalization functions. Alternatively, a CSC may also include one AFE chip, which is electrically connected to all the battery devices in the energy storage unit to collect data such as voltage, current, and temperature of all the battery devices. The term AFE chip can also be replaced with other terms, such as data acquisition chip. Furthermore, there is a communication connection between the MCU and the m AFE chips to control the m AFE chips. The SBMU can provide power to the MCU. Additionally, the MCU can be used for data processing, interface management, and communication.

[0077] The SBMU and CSC can communicate via a dual cluster controller area network (CCAN) bus. This means that two CCAN buses, CCAN-H and CCAN-L, are deployed between the SBMU and CSC for communication. CCAN-H is used to transmit high-voltage signals, and CCAN-L is used to transmit low-voltage signals. The SBMU can supply power to the CSC via two wires.

[0078] Figure 3 A schematic flowchart of an energy-saving method 300 according to an embodiment of this application is shown. Optionally, the execution entity of method 300 can be an SBMU. Method 300 includes: S310 and SBMU acquire first information, which includes parameters used to indicate the operating status of the energy storage device.

[0079] S320. When it is determined that the energy storage device is in a circuit disconnected state based on the first information, the SBMU sends a first instruction to the first CSC. The first instruction is used to instruct the first AFE chip to switch from the working state to the sleep state.

[0080] The operating state of the energy storage device is determined based on at least one energy storage unit. That is, the operating state of the energy storage device is determined by referring to the information of each energy storage unit in at least one energy storage unit. For example, the information of the energy storage unit includes, but is not limited to, current value, voltage value, etc.

[0081] Since the operation of the first AFE chip requires power from the first battery device, when the first AFE chip switches from the working state to the sleep state, the first AFE chip will no longer obtain power from the first battery device. This can reduce the power consumption of the first AFE chip on the first battery device, thereby reducing the stored power consumed when the energy storage device is in the circuit disconnected state.

[0082] Specifically, when the energy storage device is in a circuit-disconnected state, the AFE chip in the energy storage device can stop working. Therefore, by instructing the AFE chip to switch from the working state to the dormant state when the energy storage device is in a circuit-disconnected state, the power consumption of the AFE chip to the battery device corresponding to the AFE chip can be reduced, thereby reducing the stored power consumed when the energy storage device is in a circuit-disconnected state.

[0083] When an energy storage device is in a circuit-disconnected state, it indicates that the device has been disconnected from the high-voltage power grid or the load terminal, meaning it has stopped supplying power. When an energy storage device is in a high-voltage online state, it indicates that it is connected to the high-voltage power grid or the load terminal.

[0084] The operating states of an energy storage device include, but are not limited to: circuit on, circuit off, standby, hibernation, frequency regulation, or off-grid status. The circuit on state can also be understood as a high-voltage online state. The circuit on state includes charging and discharging states. Different operating states correspond to different operating state parameters; that is, the SBMU can identify the corresponding operating state through different operating state parameters. For example, when the main positive relay is closed, the main negative relay is closed, and the current value is greater than B1 A, the energy storage device is in the circuit on state. For example, when the main positive relay is not closed, the main negative relay is not closed, and the current value is less than B2 A, the energy storage device is in the circuit off state. For example, when the main positive relay is closed, the main negative relay is closed, and the current value is less than B3 A, the energy storage device is in standby state. For example, when the main positive relay is not closed, the main negative relay is not closed, and the CSC is not supplying power, the energy storage device is in hibernation state. Furthermore, the operating state of the energy storage device is determined based on at least one energy storage unit. For example, the operating state of the energy storage device is related to the output current value of each energy storage unit. When it is determined that the total output current value of the at least one energy storage unit is greater than B1 A, and when the main positive relay is closed and the main negative relay is closed, the energy storage device is in the circuit conduction state.

[0085] For example, the SBMU can identify the energy storage device's operating state as charging state by operating state parameters such as "gradual increase in current value + gradual increase in state of charge (SOC) + slow rise in temperature (≤45℃)".

[0086] For example, the SBMU can identify the operating state of the energy storage device as the discharge state by operating state parameters such as "current value gradually decreases + SOC decreases + power matches load + voltage drops gradually".

[0087] For example, the SBMU can identify the operating state of the energy storage device as frequency regulation state by operating state parameters such as "high-frequency positive and negative power switching + SOC maintenance of 40%–60% + automatic gain control (AGC) command response rate > 95%".

[0088] For example, the SBMU can identify the energy storage device's off-grid status using operating status parameters such as "grid voltage = 0 + power conversion system (PCS) autonomous output voltage + local load current > 0".

[0089] For example, the SBMU can identify the energy storage device's operating state as a dormant state by operating status parameters such as "current ≈ 0 + communication module in sleep mode + self-consumption power < 5W + relay disconnected".

[0090] For example, the SBMU can identify the operating state of the energy storage device as the circuit disconnected state by operating status parameters such as "high voltage bus voltage ≈ 0V, absolute current value < 5A or charging / discharging power ≈ 0kW".

[0091] The aforementioned operating status parameters can be determined by sensors built into the energy storage device. These sensors can then feed back the acquired operating status parameters to the SBMU. In this way, the SBMU can identify the operating status of the energy storage device using these parameters. The sensor setup and the information exchange between the sensors and the SBMU will not be elaborated further.

[0092] When the SBMU determines that the energy storage device is in a circuit-off state based on the parameters included in the first information, the SBMU can send a first command to the first CSC to trigger the first AFE chip to switch from the operating state to the sleep state. Specifically, when the first AFE chip includes one AFE chip, the SBMU instructs that single AFE chip to switch from the operating state to the sleep state. When the first AFE chip includes at least one AFE chip, the SBMU instructs all of the at least one AFE chip to switch from the operating state to the sleep state. Optionally, the SBMU can also instruct some of the at least one AFE chip to switch from the operating state to the sleep state.

[0093] Upon receiving the first instruction, the first CSC can immediately control the first AFE chip to switch from the working state to the sleep state according to the first instruction. Alternatively, the first CSC can control the first AFE chip to switch from the working state to the sleep state after a certain period of time after receiving the first instruction; there is no limitation on this. The process or procedure of how the first CSC controls the first AFE chip to switch from the working state to the sleep state will not be described in detail.

[0094] One possible implementation is that the energy storage device does not experience a power output disconnection fault. When the energy storage device does not experience a power output disconnection fault, it indicates that the reason the energy storage device is in a circuit disconnection state is not due to a power output disconnection fault. In this way, the SBMU can instruct the first AFE chip to switch from the working state to the sleep state while ensuring the safety of the energy storage device.

[0095] Specifically, energy storage devices can experience various faults, each manifesting in different ways, such as overcurrent faults and invalid cell voltage faults. Since power output disconnection faults are a relatively serious type of fault, when it is determined that the energy storage device does not have a power output disconnection fault and the energy storage device is in a circuit disconnected state, the SBMU can instruct the first AFE chip to switch from the operating state to the sleep state.

[0096] One possible implementation is that the first instruction is used to instruct the first AFE chip to switch from an active state to a sleep state, including: The first instruction is used to instruct the first AFE chip to stop performing sampling functions on at least one first battery device, and / or, The first instruction is used to instruct the first AFE chip to stop performing equalization functions on at least one first battery device.

[0097] When the first instruction instructs the first AFE chip to stop sampling the first battery device, the power consumption of the first AFE chip on the first battery device is reduced because the first AFE chip does not need to sample the first battery device. Similarly, when the first instruction instructs the first AFE chip to stop equalizing the first battery device, the power consumption of the first AFE chip on the first battery device is reduced because the first AFE chip does not need to perform equalization. Furthermore, when the first instruction instructs the first AFE chip to stop both sampling and equalization functions on the first battery device, the power consumption of the first AFE chip on the first battery device can be further reduced.

[0098] The first AFE chip can switch from the working state to the sleep state in various ways. For example, the first AFE chip stops performing sampling functions on the battery device; or, for another example, the first AFE chip stops performing equalization functions on the battery device; or, for yet another example, the first AFE chip stops performing both sampling and equalization functions on the battery device.

[0099] When the first instruction does not explicitly specify the specific behavior of the first AFE chip, one possible example is that the first AFE chip can flexibly determine the corresponding sleep behavior. For example, the first AFE chip may independently determine to stop performing the sampling function on the first battery device; another example is that the first AFE chip may independently determine to stop performing the equalization function on the first battery device; for example, the first AFE chip may independently determine to stop performing both the sampling and equalization functions on the first battery device. Yet another possible example is that the first AFE chip may directly determine to stop performing both the sampling and equalization functions on the first battery device.

[0100] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0101] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0102] One possible implementation is that the first instruction includes information to instruct the first AFE chip to stop performing equalization and sampling functions on the first battery device. In this way, the first AFE chip can perform corresponding actions based on the specific information in the first instruction.

[0103] One possible implementation is that the first information includes at least one of the following: The output voltage value of the first energy storage unit The output current value of the first energy storage unit Fault codes for energy storage devices The second instruction is used to instruct the first CSC to switch from active state to hibernation state, or... The first CSC's equalization function status.

[0104] Thus, the SBMU can determine the operating status of the energy storage device based on one or more of the above information.

[0105] The output voltage value of the first energy storage unit can also be determined by the first CSC through the AFE chip.

[0106] The output current value of the first energy storage unit can be obtained by a current sensor built into the first energy storage unit, or the output current value of the first energy storage unit can be determined by the first CSC through the AFE chip.

[0107] Fault codes for energy storage devices can be acquired by sensors built into the device. For example, the energy storage device may be equipped with sensors to monitor or detect specific faults. These sensors can detect the status of the storage device in real time or periodically and send the corresponding fault code to the SBMU when a fault is detected. The mapping relationship between faults and fault codes can be pre-configured in the sensors.

[0108] The balancing function status of the first CSC can be obtained by the first CSC itself. For example, when the balancing function status of the first CSC is enabled, the first CSC can send information to the SBMU indicating that the balancing function status of the first CSC is enabled. As another example, when the balancing function status of the first CSC is disabled, the first CSC can send information to the SBMU indicating that the balancing function status of the first CSC is disabled. In this way, the SBMU can determine the balancing function status of the first CSC and determine the operating status of the energy storage device based on the balancing function status of the first CSC, for example, when the balancing function status of the first CSC is...

[0109] The SBMU can receive a second command from an external device. Based on this command, the SBMU can determine that the energy storage device is in a circuit-disconnected state by switching from the working state to the hibernation state from the first CSC indicated by the second command.

[0110] In one possible implementation, the energy storage device further includes a second energy storage unit, which includes a second CSC and at least one second battery device. The second CSC includes a second AFE chip, which is electrically connected to at least one second battery device. The first information also includes at least one of the following: The output voltage value of the second energy storage unit The output current value of the second energy storage unit, or, The equalization function status information of the second CSC.

[0111] In this way, the SBMU can determine whether the energy storage device is in a disconnected state by using information from multiple energy storage units. This improves the accuracy of the SBMU's judgment.

[0112] One possible implementation is that the SBMU determines the energy storage device is in a circuit-off state based on the first information, including: When the SBMU determines that the energy storage device is in a circuit-disconnected state, it determines that the energy storage device meets at least one of the following first conditions based on the first information. The first condition is: The output current value of the first energy storage unit is less than or equal to the first current threshold. The output voltage of the first energy storage unit is less than or equal to the first voltage threshold. The equalization function of the first CSC is in the off state; or, Fault codes for energy storage devices do not include power output disconnection fault codes.

[0113] Thus, by setting one or more of the above conditions to determine whether the energy storage device is in a circuit-disconnected state, the accuracy of the SBMU in determining whether the energy storage device is in a circuit-disconnected state can be improved.

[0114] When the first information includes the output current value of the first energy storage unit, the SBMU can determine whether the energy storage device is in a circuit-disconnected state based on the relationship between the output current threshold of the first energy storage unit and a first current threshold. For example, when the SBMU determines that the output current threshold of the first energy storage unit is greater than or equal to the first current threshold, the SBMU can determine that the energy storage device is in a circuit-disconnected state. When the SBMU determines that the output current threshold of the first energy storage unit is greater than the first current threshold, the SBMU determines that the energy storage device is not in a circuit-disconnected state. For example, the first current threshold can be set to nA, where n is related to the loop current after a period of time following the transition from the charging / discharging state to the stopped charging / discharging state.

[0115] When the first information includes the output voltage value of the first energy storage unit, the SBMU can determine whether the energy storage device is in a circuit-off state based on the relationship between the output voltage threshold of the first energy storage unit and a first voltage threshold. For example, when the SBMU determines that the output voltage threshold of the first energy storage unit is greater than or equal to the first voltage threshold, the SBMU can determine that the energy storage device is in a circuit-off state. When the SBMU determines that the output voltage threshold of the first energy storage unit is greater than the first voltage threshold, the SBMU determines that the energy storage device is not in a circuit-off state. For example, the first voltage threshold can be set to 4V.

[0116] When the first information includes a fault code for the energy storage device, and the fault code for the energy storage device does not include a power output disconnection fault code, the SBMU can determine that the energy storage device can be in a circuit disconnection state based on the fact that the energy storage device has not experienced a power output disconnection fault.

[0117] When the first information includes the balancing function status information of the first CSC, the SBMU can determine the status of the balancing function of the first CSC based on this information. For example, if the balancing function status information indicates that the balancing function of the first CSC is off, the SBMU can determine that the energy storage device is in a circuit-disconnected state. Conversely, if the balancing function status information indicates that the balancing function of the first CSC is on, the SBMU can determine that the energy storage device is not in a circuit-disconnected state.

[0118] In one possible implementation, when the energy storage device further includes at least one energy storage unit, the first information also includes the balancing function status information of the CSCs in the at least one energy storage unit. In this way, the SBMU can determine whether the energy storage device is in a circuit-disconnected state based on the balancing function status information of all CSCs in the energy storage device, which can improve the accuracy of the SBMU in determining whether the energy storage device is in a circuit-disconnected state.

[0119] For example, if the balancing function of all CSCs in the energy storage device is determined to be off, the SBMU can determine that the energy storage device is in a circuit-disconnected state. Conversely, if the balancing function of some CSCs in the energy storage device is determined to be off, the SBMU can determine that the energy storage device is not in a circuit-disconnected state.

[0120] One possible implementation is that the first piece of information also includes the output current value of the energy storage device. In this way, the SBMU can determine whether the energy storage device is in a disconnected state based on the output current value, which can improve the accuracy of the SBMU's judgment.

[0121] For example, when the output current of the energy storage device is determined to be less than or equal to a threshold, the SBMU can determine that the energy storage device is in a circuit-off state. When the output current of the energy storage device is determined to be greater than the threshold, the SBMU can determine that the energy storage device is not in a circuit-off state. The aforementioned threshold can be set according to the number of battery cells in the energy storage device; for example, the threshold can be equal to mA, where m is the total number of battery cells in the energy storage device.

[0122] The above examples are all described using the premise that the energy storage device meets one first condition. However, the scenario is not limited to the energy storage device meeting one or more first conditions. For example, the SBMU determines that the output current value of the first energy storage unit is less than or equal to a first current threshold and the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold. Another example is that the SBMU determines that the output current value of the first energy storage unit is less than or equal to the first current threshold and the fault codes of the energy storage device do not include power output disconnection fault codes. Yet another example is that the SBMU determines that the output voltage value of the first energy storage unit is less than or equal to the first voltage threshold and the fault codes of the energy storage device do not include power output disconnection fault codes. Yet another example is that the SBMU determines that the output voltage value of the first energy storage unit is less than or equal to the first voltage threshold, the fault codes of the energy storage device do not include power output disconnection fault codes, and the output current value of the first energy storage unit is less than or equal to the first current threshold, and so on.

[0123] One possible implementation is that the SBMU determines the energy storage device is in a circuit-off state when it is determined, based on first information, that the energy storage device satisfies at least one of the following first conditions: When the duration for which the energy storage device satisfies at least one of the first conditions is T time units, the SBMU determines that the energy storage device is in a circuit-off state, where T is a positive integer.

[0124] Thus, by setting the feature of T time units, the reliability of the SBMU in determining that the energy storage device is in a circuit-off state can be improved.

[0125] The energy storage device can satisfy different first conditions at different times. For example, the energy storage device satisfies the first first condition at time 1, the second first condition at time 2, and the third first condition at time 3. Time 1, time 2, and time 3 are three different times, and the duration of satisfying each first condition is T time units, where the time unit can be seconds, minutes, etc., and T is a positive integer.

[0126] One possible implementation, method 300 also includes: The SBMU receives second information from the first CSC, which indicates that the first AFE chip has switched from the working state to the sleep state. Based on the second information, the SBMU sends a third instruction to the first CSC, which instructs the first CSC to switch from the working state to the hibernation state.

[0127] Thus, when the SBMU determines that the first AFE chip is in a sleep state, it can instruct the first CSC to switch from the working state to the sleep state, which can further reduce the power consumed by the energy storage device when the circuit is disconnected.

[0128] Specifically, when the SBMU sends a first instruction to the first CSC to trigger the first AFE chip to switch from the working state to the sleep state, the first CSC can report the state switching status of the first AFE chip to the SBMU. When the first CSC reports to the SBMU that the first AFE chip has switched from the working state to the sleep state, the SBMU can instruct the first CSC to switch from the working state to the sleep state.

[0129] The SBMU can send the first instruction to the first CSC multiple times until the first CSC reports back to the SBMU that the first AFE chip has switched from the working state to the sleep state, at which point the SBMU stops sending the first instruction to the first CSC. Therefore, the aforementioned second information can be sent by the first CSC to the SBMU after receiving the first instruction once, or it can be sent by the first CSC to the SBMU after receiving multiple first instructions; there is no limitation on this.

[0130] One possible implementation, method 300 also includes: SBMU stops supplying power to the first CSC.

[0131] This can further reduce the amount of electricity consumed by the energy storage device when the circuit is disconnected.

[0132] One possible implementation, method 300 also includes: When the energy storage device is determined to meet any of the following second conditions, the SBMU sends a fourth instruction to the first CSC, which instructs the first CSC to switch from the dormant state to the working state. The second condition includes: The SBMU receives the fifth instruction, which instructs the energy storage device to switch from the circuit disconnected state to the circuit connected state. The output current value of the first energy storage unit at the first moment is greater than or equal to the second current threshold, and the first moment is after the moment when the first CSC is in a dormant state. The output voltage of the first energy storage unit at the second moment is greater than or equal to the second voltage threshold, and the second moment is after the moment when the first CSC is in a dormant state. The SBMU receives the sixth instruction, which instructs the first CSC to switch from sleep mode to working mode; The duration of the first CSC switching from working state to sleep state is greater than K time units, where K is a positive integer; or... The SBMU received a low-voltage fault code from the energy storage device.

[0133] By setting a second condition, the first CSC can switch from a dormant state to a working state, and thus switch between the dormant and working states.

[0134] One possible example is that the second condition includes: the SBMU receives a fifth instruction, which may come from an external device, such as an application installed on the terminal. If the terminal can sense that the external load device has a charging need, the terminal can trigger the first CSC to switch from the sleep state to the working state by sending the fifth instruction to the SBMU.

[0135] One possible example is that the second condition includes: the output current value of the first energy storage unit at a first moment is greater than or equal to a second current threshold. The SBMU can sense the output current value of the first energy storage unit at the first moment through a current sensor built into the energy storage device, and compare the output current value of the first energy storage unit at the first moment with a preset second current threshold. When it is determined that the output current value of the first energy storage unit at the first moment is greater than or equal to the second current threshold, the SBMU can send a fourth command to the first CSC. Specifically, when the SBMU determines that the output current value of the first energy storage unit at the first moment is less than the second current threshold, the SBMU determines not to trigger the first CSC to switch from sleep mode to working mode. Alternatively, the SBMU can also determine not to trigger the first CSC to switch from sleep mode to working mode when it determines that the output current value of the first energy storage unit at the first moment is equal to the second current threshold. The second current threshold can be set to 1A or other values.

[0136] One possible implementation is that the duration for which the output current value of the first energy storage unit is greater than or equal to a second current threshold at a first moment is greater than a time threshold, such as 1 second. This can improve the accuracy of the SBMU's judgment.

[0137] One possible example is that the second condition includes: the output voltage of the first energy storage unit at a second moment is greater than or equal to a second voltage threshold. The SBMU can sense the output voltage of the first energy storage unit at the second moment through a current sensor built into the energy storage device, and compare the output voltage of the first energy storage unit at the second moment with a preset second voltage threshold. When it is determined that the output voltage of the first energy storage unit at the second moment is greater than or equal to the second voltage threshold, the SBMU can send a fourth command to the first CSC. Specifically, when the SBMU determines that the output voltage of the first energy storage unit at the second moment is less than the second voltage threshold, the SBMU determines not to trigger the first CSC to switch from sleep mode to operating mode. Alternatively, the SBMU can also determine not to trigger the first CSC to switch from sleep mode to operating mode when it determines that the output voltage of the first energy storage unit at the second moment is equal to the second voltage threshold. For example, the second voltage threshold can be set to n*10mV, where n represents the number of battery cells in the first energy storage unit.

[0138] One possible implementation is that the absolute value of the difference between the output voltage of the first energy storage unit at a second moment and the output voltage of the first energy storage unit when the first CSC is in a dormant state is greater than or equal to a voltage threshold. This voltage threshold can be 10*n mV, etc., where n is the number of battery devices in the first energy storage unit. This improves the accuracy of the SBMU in determining that the energy storage device is in a circuit-disconnected state.

[0139] One possible example is that the second condition includes: the SBMU receiving a sixth instruction, which instructs the first CSC to switch from sleep mode to active mode. The SBMU can receive the sixth instruction from an external device.

[0140] One possible example is that the second condition includes: the duration of the first CSC switching from the working state to the hibernation state is greater than K time units. For example, after determining that the first CSC has switched from the working state to the hibernation state, the SBMU can set a timer, such as 30 minutes, and the SBMU can send a fourth instruction to the first CSC after the countdown of the timer ends.

[0141] One possible example, the second condition: The SBMU receives a power output disconnection fault code from the energy storage device. For instance, the SBMU can monitor the status of the energy storage device through sensors built into it. When the sensor determines that the energy storage device has a power output disconnection fault, it sends a power output disconnection fault code to the SBMU. The SBMU determines that the energy storage device has a power output disconnection fault based on this fault code and then triggers the first CSC to switch from dormant to active state via a fourth instruction. Alternatively, the aforementioned power output disconnection fault code could also indicate a level 4 or higher fault in the energy storage device.

[0142] The above content refers to the SBMU instructing the AFE chip in the first CSC to switch from the working state to the sleep state, but it is not limited to the scenario where the SBMU instructs all AFE chips in all energy storage units in the energy storage device to switch from the working state to the sleep state.

[0143] The above method will be described below with specific examples.

[0144] In one possible example, the first information obtained by the SBMU includes the output voltage value of the first energy storage unit, the output current value of the first energy storage unit, the fault code of the energy storage device, and the equalization function status of the first CSC. Based on the above information and in conjunction with the first condition, the SBMU determines whether the energy storage device is in a circuit-disconnected state. When the SBMU determines that the energy storage device meets all the first conditions based on all the contents of the first information, it can determine that the energy storage device is in a circuit-disconnected state.

[0145] In one possible example, the first information obtained by the SBMU includes the balancing function status information of all CSCs in the energy storage device, the output current of the energy storage device, the output voltage of the energy storage device, and the fault code of the energy storage device. Based on the above information and in conjunction with the first condition, the SBMU determines whether the energy storage device is in a circuit-disconnected state. When the SBMU determines that the energy storage device meets all the first conditions based on all the contents of the first information, it can determine that the energy storage device is in a circuit-disconnected state.

[0146] In one possible example, the first information obtained by the SBMU includes the output voltage value of the first energy storage unit, the output current value of the first energy storage unit, the fault code of the energy storage device, and the equalization function status of the first CSC. Based on the above information and in conjunction with the first conditions, the SBMU determines whether the energy storage device is in a circuit-disconnected state. The SBMU can determine that the energy storage device is in a circuit-disconnected state when it determines, based on all the contents of the first information, that the energy storage device satisfies all the first conditions and that the duration of each first condition is greater than or equal to T time units.

[0147] In one possible example, the first information obtained by the SBMU includes the equalization function status information of all CSCs in the energy storage device, the output current of the energy storage device, the output voltage of the energy storage device, and the fault code of the energy storage device. Based on the above information and in conjunction with the first condition, the SBMU determines whether the energy storage device is in a circuit-disconnected state. The SBMU can determine that the energy storage device is in a circuit-disconnected state when it determines, based on all the contents of the first information, that the energy storage device satisfies all the first conditions and that the duration of each first condition is greater than or equal to T time units.

[0148] The above description assumes the energy storage device is in a circuit-disconnected state. However, this embodiment can also reduce the stored energy consumed during transportation. Transportation refers to the process of moving the energy storage device from its origin to the customer's location. During this time, the SBMU, MBMU, and SCS of the energy storage device are not powered, and the entire container is in a non-operational state. Furthermore, whether the energy storage device is in transportation can be determined by whether it has a 24V power supply. For example, if the energy storage device does not have a 24V power supply, it can be determined that it is in transportation; if it has a 24V power supply, it can be determined that it is not in transportation.

[0149] When the energy storage device is in transit, the AFE chip can be manually instructed to stop performing sampling and / or equalization functions on the battery. For example, an external device can send a command to the AFE chip via the MCU in the CSC, instructing the AFE chip to stop performing sampling and / or equalization functions on the battery. This reduces the amount of stored energy consumed during transit. The CSC can be powered by a manually supplied 24V power source.

[0150] The above description is based on the example of a battery management unit (SBMU). When the battery management unit is an MBMU or a BMS, the MBMU or BMS can obtain the first information from the SBMU and send the first instruction to the SBMU, etc. Alternatively, the MBMU or BMS can also obtain the first information through the aforementioned method of obtaining the first information from the SBMU. This is not limited.

[0151] The energy-saving method of the present application embodiment has been described above. The energy storage device of the present application embodiment will be described below. The energy storage device can perform the energy-saving method 300.

[0152] Figure 4 A schematic block diagram of an energy storage device 400 according to an embodiment of this application is shown. Figure 4 As shown, the energy storage device 400 may include: The communication unit 410 is used to acquire first information, which includes parameters for indicating the operating status of the energy storage device. The processing unit 420 is used to send a first instruction to the first CSC when it is determined from the first information that the energy storage device is in a circuit disconnected state. The first instruction is used to instruct the first AFE chip to switch from the working state to the sleep state.

[0153] The energy storage device 400 can perform the corresponding operations in the energy-saving method 300, which will not be elaborated here for the sake of simplicity.

[0154] Figure 5 This is a schematic diagram of the hardware structure of the energy storage device 500 according to an embodiment of this application. The energy storage device 500 includes a memory 501, a processor 502, a communication interface 503, and a bus 504. The memory 501, processor 502, and communication interface 503 are interconnected via the bus 504.

[0155] The memory 501 can be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 501 can store programs, and when the program stored in the memory 501 is executed by the processor 502, the processor 502 and the communication interface 503 are used to execute the various steps of the energy-saving method 300.

[0156] The processor 502 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute related programs to achieve the functions required by the units in the apparatus of this application embodiment, or to execute the energy-saving method 300.

[0157] The processor 502 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the energy-saving method 300 can be completed through integrated logic circuits in the processor 502 or through software instructions.

[0158] Processor 502 can also be a general-purpose processor, digital signal processor (DSP), ASIC, field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 501. Processor 502 reads information from memory 501 and, in conjunction with its hardware, completes the functions required by the units included in the energy storage device 500, or executes energy-saving method 300.

[0159] The communication interface 503 uses transceiver devices, such as, but not limited to, transceivers, to enable communication between the energy storage device 500 and other devices or communication networks.

[0160] Bus 504 may include a pathway for transmitting information between various components of energy storage device 500 (e.g., memory 501, processor 502, communication interface 503).

[0161] Although only the memory, processor, and communication interface are shown in the energy storage device 500, those skilled in the art should understand that in specific implementations, the energy storage device 500 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the energy storage device 500 may also include hardware devices for implementing other additional functions. Moreover, those skilled in the art should understand that the energy storage device 500 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 5 All the devices shown.

[0162] This application embodiment also provides a battery management unit, which includes a processor and a memory. The memory is used to store a program; the processor is used to execute the program stored in the memory. When the program stored in the memory is executed, the processor is used to execute an energy-saving method 300.

[0163] This application also provides an energy storage system, which includes a power conversion device and the aforementioned energy storage device. The power conversion device is used to electrically connect the power generation device and the energy storage device. The power conversion device can be understood as a PCS (Power Conversion System) or similar device.

[0164] This application also provides a charging network, which includes charging piles and the aforementioned energy storage device, the energy storage device being used to provide electrical energy to the charging piles.

[0165] This application embodiment also provides a charging network, which includes charging piles and the aforementioned energy storage system, wherein the energy storage device in the aforementioned energy storage system is used to provide power to the charging piles.

[0166] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0167] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0168] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the energy-saving method of the energy storage device described above.

[0169] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, but these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy-saving method, characterized in that, include: The first information is obtained, which includes parameters for indicating the operating status of the energy storage device. The energy storage device includes at least one energy storage unit, and the at least one energy storage unit includes a first energy storage unit. The first energy storage unit includes a first battery monitoring circuit and at least one first battery device. The first battery monitoring circuit includes a first analog front-end chip, which is electrically connected to the at least one first battery device. The operating status of the energy storage device is determined with reference to the information of each energy storage unit in the at least one energy storage unit. When it is determined that the energy storage device is in a circuit disconnected state based on the first information, a first instruction is sent to the first battery monitoring circuit. The first instruction is used to instruct the first analog front-end chip to switch from the working state to the sleep state.

2. The method according to claim 1, characterized in that, The step of determining that the energy storage device is in a circuit-disconnected state based on the first information includes: When the energy storage device is determined to be in a circuit disconnected state based on the first information, the energy storage device is determined to meet at least one of the following first conditions. The first condition is: The output current value of the first energy storage unit is less than or equal to the first current threshold. The output voltage of the first energy storage unit is less than or equal to the first voltage threshold. The equalization function of the first battery monitoring circuit is in the off state; or, The fault codes for the energy storage device do not include power output disconnection fault codes.

3. The method according to claim 2, characterized in that, The step of determining that the energy storage device is in a circuit-disconnected state based on the first information includes: When the duration of the first condition satisfied by the energy storage device is determined to be T time units, the energy storage device is determined to be in a circuit disconnected state, where T is a positive integer.

4. The method according to any one of claims 1 to 3, characterized in that, The first information includes at least one of the following: The output voltage value of the first energy storage unit, The output current value of the first energy storage unit, The fault code of the energy storage device The equalization function status information of the first battery monitoring circuit, or, The second instruction is used to instruct the first battery monitoring circuit to switch from the working state to the sleep state.

5. The method according to any one of claims 1 to 3, characterized in that, The method further includes: Receive second information from the first battery monitoring circuit, the second information being used to indicate that the first analog front-end chip has switched from the working state to the sleep state; Based on the second information, a third instruction is sent to the first battery monitoring circuit, the third instruction being used to instruct the first battery monitoring circuit to switch from the working state to the sleep state.

6. The method according to claim 5, characterized in that, The method further includes: Stop supplying power to the first battery monitoring circuit.

7. The method according to claim 6, characterized in that, The method further includes: When it is determined that the energy storage device meets any of the following second conditions, a fourth instruction is sent to the first battery monitoring circuit, the fourth instruction being used to instruct the first battery monitoring circuit to switch from a dormant state to an active state. The second condition includes: The fifth instruction is received, which instructs the energy storage device to switch from a circuit disconnected state to a circuit connected state; The output current value of the first energy storage unit at the first moment is greater than or equal to the second current threshold, and the first moment is after the moment when the first battery monitoring circuit is in a dormant state. The output voltage of the first energy storage unit at the second moment is greater than or equal to the second voltage threshold, and the second moment is after the moment when the first battery monitoring circuit is in a dormant state. The sixth instruction is received, which instructs the first battery monitoring circuit to switch from a sleep state to an operating state; The sleep duration of the first battery monitoring circuit is greater than or equal to K time units, where K is a positive integer; or, A power output disconnection fault code was received from the energy storage device.

8. The method according to any one of claims 1 to 3, characterized in that, The first instruction is used to instruct the first analog front-end chip to switch from an active state to a sleep state, including: The first instruction is used to instruct the first analog front-end chip to stop performing sampling functions on the at least one first battery device, and / or, The first instruction is used to instruct the first analog front-end chip to stop performing the equalization function on the at least one first battery device.

9. The method according to claim 4, characterized in that, The at least one energy storage unit further includes a second energy storage unit, the second energy storage unit including a second battery monitoring circuit and at least one second battery device, the second battery monitoring circuit including a second analog front-end chip, the second analog front-end chip being electrically connected to the at least one second battery device, and the first information further including at least one of the following: The output voltage value of the second energy storage unit, The output current value of the second energy storage unit, or, The equalization function status information of the second battery monitoring circuit.

10. The method according to any one of claims 1 to 3, characterized in that, The energy storage device does not have a power output disconnection fault.

11. An energy storage device, characterized in that, The energy storage device includes a battery management unit and at least one energy storage unit. The at least one energy storage unit includes a first energy storage unit. The first energy storage unit includes a first battery monitoring circuit and at least one first battery device. The first battery monitoring circuit includes a first analog front-end chip. The first analog front-end chip is connected to the at least one first battery device. The operating state of the energy storage device is determined by referring to the information of each energy storage unit in the at least one energy storage unit. The battery management unit is used for: Obtain first information, the first information including parameters for indicating the operating status of the energy storage device; When it is determined that the energy storage device is in a non-high voltage online state based on the first information, a first instruction is sent to the first battery monitoring circuit. The first instruction is used to instruct the first analog front-end chip to switch from the working state to the sleep state.

12. The energy storage device according to claim 11, characterized in that, The step of determining that the energy storage device is in a circuit-disconnected state based on the first information includes: When the energy storage device is determined to be in a circuit disconnected state based on the first information, the energy storage device is determined to meet at least one of the following first conditions. The first condition is: The output current value of the first energy storage unit is less than or equal to the first current threshold. The output voltage of the first energy storage unit is less than or equal to the first voltage threshold. The equalization function of the first battery monitoring circuit is in the off state; or, The fault codes for the energy storage device do not include power output disconnection fault codes.

13. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 11 or 12, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

14. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 11 or 12, the energy storage device being used to provide electrical energy to the charging pile.

15. A charging network, characterized in that, It includes a charging pile and the energy storage system of claim 13, wherein the energy storage device is used to provide electrical energy to the charging pile.

16. An energy storage device, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform the energy-saving method according to any one of claims 1 to 10.

17. A battery management unit, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform the energy-saving method according to any one of claims 1 to 10.

18. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the energy-saving method according to any one of claims 1 to 10.

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