Energy saving method, energy storage device, energy storage system and charging network

Abstract

The application provides an energy-saving method, an energy storage device, an energy storage system and a charging network. In the method, the energy storage device comprises a battery management unit and at least one energy storage unit. When it is determined according to a parameter used for indicating the working state of the energy storage device that the energy storage device is in a circuit-off state, the battery management unit can send an instruction to a battery monitoring circuit in the energy storage unit, and the instruction is used for instructing an analog front-end chip in the battery monitoring circuit to switch from a working state to a dormant state. Since the operation of the analog front-end chip needs to be provided with electric energy by a battery device in the energy storage unit, when the analog front-end chip switches from the working state to the dormant state, the analog front-end chip will not continue to obtain electric energy from the battery device, which can reduce the consumption of the electric quantity of the battery monomer by the analog front-end chip, thereby reducing the consumed storage electric quantity when the energy storage device is in the circuit-off state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and more particularly, to an energy-saving method, an energy storage device, an energy storage system, and a charging network. BACKGROUND

[0002] An energy storage device is a device that stores surplus energy and releases the stored surplus energy during a power consumption peak period, and can be used to solve the time and space contradiction of energy supply and demand and improve the stability and efficiency of an energy system.

[0003] In order to increase the total length of time during which the energy storage device supplies power to the outside, the energy storage device can be in a circuit disconnection state when it does not supply power to the outside, that is, the energy storage device is disconnected from the high-voltage power grid or the load end. At present, the energy storage device in the circuit disconnection state still consumes stored power, thereby causing the total length of time during which the energy storage device supplies power to the outside to be shortened. Therefore, how to reduce the stored power consumed by the energy storage device in the circuit disconnection state is a technical problem to be solved at present. SUMMARY

[0004] The present application provides an energy-saving method, an energy storage device, an energy storage system, and a charging network, which can reduce the stored power consumed by the energy storage device in the circuit disconnection state.

[0005] In a first aspect, an energy-saving method is provided, which includes: obtaining first information, the first information including a parameter for indicating a working 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 the at least one first battery device, the working state of the energy storage device being determined with reference 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 disconnection state, sending a first instruction to the first CSC, the first instruction being used to instruct the first AFE chip to switch from a working state to a sleep state.

[0006] Since the operation of the first AFE chip needs to be provided with power by 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, which can reduce the consumption of the power of the first battery device by the first AFE chip, thereby reducing the stored power consumed by the energy storage device in the circuit disconnection state.

[0007] Specifically, when the energy storage device is in the circuit-off state, the AFE chip in the energy storage device can stop working, and thus, by instructing the AFE chip to switch from the working state to the sleep state when the energy storage device is in the circuit-off state, the power consumption of the AFE chip on the battery device corresponding to the AFE chip can be reduced, so that the storage power consumed when the energy storage device is in the circuit-off state can be reduced.

[0008] In a possible implementation, the first information includes at least one of the following: an output voltage value of the first energy storage unit, an output current value of the first energy storage unit, a fault code of the energy storage device, an equalization function state information of the first CSC, or a second instruction, the second instruction being used to instruct the first CSC to switch from the working state to the sleep state. In this way, the working state of the energy storage device can be determined according to one or more of the above information.

[0009] In a possible implementation, the determining, according to the first information, that the energy storage device is in the circuit-off state includes: determining that the energy storage device is in the circuit-off state when the energy storage device satisfies at least one of the following first conditions according to 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 state of the first CSC is the closed state; or the fault code of the energy storage device does not include the power output-off fault code. In this way, by setting one or more of the above conditions, the accuracy of determining that the energy storage device is in the circuit-off state can be improved.

[0010] In a possible implementation, the determining, according to the first information, that the energy storage device is in the circuit-off state includes: determining that the energy storage device is in the circuit-off state when the duration for which the first condition satisfied by the energy storage device is T time units, where T is a positive integer. In this way, by setting the feature of T time units, the reliability of determining that the energy storage device is in the circuit-off state can be improved.

[0011] In a possible implementation, the method further includes: receiving second information from the first CSC, the second information being used to instruct that the first AFE chip has switched from the working state to the sleep state; and sending, according to the second information, a third instruction to the first CSC, the third instruction being used to instruct the first CSC to switch from the working state to the sleep state. In this way, the first CSC can be instructed to switch from the working state to the sleep state when it is determined that the first AFE chip is in the sleep state, which can further reduce the power consumed when the energy storage device is in the circuit-off state.

[0012] A possible implementation manner, the method further comprises: stopping power supply for the first CSC. In this way, this can further reduce the storage power consumed by the energy storage device when in the circuit disconnection state.

[0013] A possible implementation manner, the method further comprises: sending a fourth instruction to the first CSC when determining that the energy storage device satisfies any one of second conditions, the fourth instruction being used to instruct the first CSC to switch from the sleep state to the working state. The second conditions include: receiving a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from the circuit disconnection state to the circuit connection state; an output current value of the first energy storage unit at a first time is greater than or equal to a second current threshold, the first time being after a time when the first CSC is in the sleep state; an output voltage value of the first energy storage unit at a second time is greater than or equal to a second voltage threshold, the second time being after a time when the first CSC is in the sleep state; receiving a sixth instruction, the sixth instruction being used to instruct the first CSC to switch from the sleep state to the working state; a sleep duration of the first CSC is greater than or equal to K time units, K being a positive integer; or, receiving a power output disconnection fault code of the energy storage device. By setting the second conditions, this can realize that the first CSC can switch from the sleep state to the working state, and further realize mutual switching between the sleep state and the working state of the first CSC.

[0014] A possible implementation manner, the first instruction being used to instruct the first AFE chip to switch from the working state to the sleep state comprises: the first instruction being used to instruct the first AFE chip to stop performing a sampling function on at least one first battery device, and / or, the first instruction being used to instruct the first AFE chip to stop performing an equalization function on at least one first battery device.

[0015] When the first instruction is used to instruct the first AFE chip to stop performing the sampling function on the first battery device, since the first AFE chip does not need to sample the first battery device, this can reduce consumption of the first AFE chip on the power of the first battery device. When the first instruction is used to instruct the first AFE chip to stop performing the equalization function on the first battery device, since the first AFE chip does not need to perform the equalization function on the first battery device, this can reduce consumption of the first AFE chip on the power of the first battery device. When the first instruction is used to instruct the first AFE chip to stop performing the sampling and equalization functions on the first battery device, this can further reduce consumption of the first AFE chip on the power of the first battery device.

[0016] In a possible implementation, the at least one energy storage unit further includes a second energy storage unit, and the second energy storage unit includes a second CSC and at least one second battery device, the second CSC includes a second AFE chip, the second AFE chip is electrically connected with the at least one second battery device, and the first information further includes at least one of: an output voltage value of the second energy storage unit, an output current value of the second energy storage unit, or equalization function state information of the second CSC. In this way, whether the energy storage device is in the circuit disconnection state can be determined through the information of the plurality of energy storage units. Therefore, the accuracy of determining that the energy storage device is in the circuit disconnection state can be improved.

[0017] In a possible implementation, the energy storage device does not have a power output disconnection fault. When the energy storage device does not have the power output disconnection fault, it can be indicated that the reason why the energy storage device is in the circuit disconnection state is not the power output disconnection fault. In this way, the first AFE chip can be switched from the working state to the dormant state on the premise of ensuring the safety of the energy storage device.

[0018] In a possible implementation, when the energy storage device further includes at least one energy storage unit, the first information further includes equalization function state information of a CSC in the at least one energy storage unit. In this way, whether the energy storage device is in the circuit disconnection state can be determined according to the equalization function state information of all the CSCs in the energy storage device, which can improve the accuracy of determining that the energy storage device is in the circuit disconnection state.

[0019] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing a sampling function on the first battery device. In this way, the first AFE chip can perform a corresponding action according to the specific information in the first instruction.

[0020] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing an equalization function on the first battery device. In this way, the first AFE chip can perform a corresponding action according to the specific information in the first instruction.

[0021] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing an equalization function and a sampling function on the first battery device. In this way, the first AFE chip can perform a corresponding action according to the specific information in the first instruction.

[0022] In a second aspect, a power storage device is provided, which includes a battery management unit and at least one power storage unit, the at least one power storage unit including a first power storage unit, the first power storage unit including a first CSC and at least one first battery device, the first CSC including a first AFE chip, the first AFE chip being connected to the at least one first battery device, an operating state of the power storage device being determined with reference to information of each power storage unit in the at least one power storage unit; the battery management unit being configured to: acquire first information, the first information including a parameter indicating the operating state of the power storage device; and send a first instruction to the first CSC when it is determined according to the first information that the power storage device is in a battery management unit state, the first instruction being used to instruct the first AFE chip to switch from the operating state to a sleep state.

[0023] In a possible implementation, the first information includes at least one of: an output voltage value of the first power storage unit, an output current value of the first power storage unit, a fault code of the power storage device, an equalization function state information of the first CSC, or a second instruction used to instruct the first CSC to switch from the operating state to the sleep state.

[0024] In a possible implementation, the first information includes at least one of: an output voltage value of the first power storage unit, an output current value of the first power storage unit, a fault code of the power storage device, an equalization function state information of the first CSC, or a second instruction used to instruct the first CSC to switch from the operating state to the sleep state.

[0025] In a possible implementation, the battery management unit determines that the power storage device is in a circuit disconnection state according to the first information, including: when it is determined according to the first information that the power storage device satisfies at least one first condition, the battery management unit determines that the power storage device is in the circuit disconnection state. The first condition includes: the output current value of the first power storage unit is less than or equal to a first current threshold; the output voltage value of the first power storage unit is less than or equal to a first voltage threshold; the equalization function state of the first CSC is a closed state; or the fault code of the power storage device does not include a power output disconnection fault code.

[0026] In a possible implementation, the battery management unit determines that the power storage device is in a battery management unit state according to the first information, including: when it is determined that a duration for which the first condition satisfied by the power storage device lasts is T time units, the battery management unit determines that the power storage device is in the battery management unit state, T being a positive integer.

[0027] In a possible implementation, the battery management unit is further configured to: receive second information from the first CSC, the second information being used to indicate that the first AFE chip has switched from the working state to the sleep state; and send, according to the second information, a third instruction to the first CSC, the third instruction being used to instruct the first CSC to switch from the working state to the sleep state.

[0028] In a possible implementation, the battery management unit is further configured to: stop supplying power to the first CSC.

[0029] In a possible implementation, the battery management unit is further configured to: send, when determining that the energy storage device satisfies any one of second conditions, a fourth instruction to the first CSC, the fourth instruction being used to instruct the first CSC to switch from the sleep state to the working state. The second conditions include: receiving a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from the circuit disconnection state to the circuit connection state; an output current value of the first energy storage unit at a first time being greater than or equal to a second current threshold, the first time being after a time when the first CSC is in the sleep state; an output voltage value of the first energy storage unit at a second time being greater than or equal to a second voltage threshold, the second time being after a time when the first CSC is in the sleep state; receiving a sixth instruction, the sixth instruction being used to instruct the first CSC to switch from the sleep state to the working state; a sleep duration of the first CSC being greater than or equal to K time units, K being a positive integer; or receiving a power output disconnection fault code of the energy storage device.

[0030] In a possible implementation, the first instruction, used to instruct the first AFE chip to switch from the working state to the sleep state, includes: the first instruction being used to instruct the first AFE chip to stop performing a sampling function on at least one first battery device, and / or the first instruction being used to instruct the first AFE chip to stop performing an equalization function on at least one first battery device.

[0031] In a 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 the at least one second battery device, and the first information further includes at least one of: an output voltage value of the second energy storage unit, an output current value of the second energy storage unit, or equalization function state information of the second CSC.

[0032] In a possible implementation, the energy storage device does not have a power output disconnection fault. When the energy storage device does not have the power output disconnection fault, it can indicate that the reason why the energy storage device is in the circuit disconnection state is not the power output disconnection fault. Therefore, 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.

[0033] In a possible implementation, the energy storage device further includes at least one energy storage unit, and the first information further includes equalization function state information of the CSC in the at least one energy storage unit. In this way, the battery management unit can determine whether the energy storage device is in the non-high-voltage online state according to the equalization function state information of all the CSCs in the energy storage device, which can improve the accuracy of the battery management unit in determining that the energy storage device is in the circuit disconnection state.

[0034] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the sampling function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0035] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the equalization function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0036] In a possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the equalization function and the sampling function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0037] In a third aspect, an energy storage device is provided, which includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to invoke the computer program to execute the method in the first aspect or any of the implementations of the first aspect.

[0038] In a fourth aspect, a battery management unit is provided, which includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to invoke the computer program to execute the method in the first aspect or any of the implementations of the first aspect.

[0039] In a fifth aspect, an energy storage system is provided, which includes a power conversion device and the energy storage device in the second aspect or any of the implementations of the second aspect. The power conversion device is configured to be electrically connected to a power generation device and the energy storage device.

[0040] In a sixth aspect, a charging network is provided, which includes a charging pile and the energy storage device in the second aspect or any of the implementations of the second aspect. The energy storage device is configured to provide electric energy for the charging pile.

[0041] In a seventh aspect, a charging network is provided, which includes a charging pile and the energy storage system in the fourth aspect. The energy storage device is configured to provide electric energy for the charging pile.

[0042] In an eighth aspect, a computer readable storage medium is provided for storing a computer program, which causes a computer to execute the method in the first aspect or the implementation manners thereof. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 A schematic diagram of an application scenario of an energy saving method of an embodiment of the present application is shown.

[0044] Figure 2 A schematic block diagram of an energy storage device of an embodiment of the present application is shown.

[0045] Figure 3 A schematic flow chart of an energy saving method 300 of an embodiment of the present application is shown.

[0046] Figure 4 A schematic block diagram of an energy storage device 400 of an embodiment of the present application is shown.

[0047] Figure 5 A schematic diagram of a hardware structure of an energy storage device 500 of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] Embodiments of the present application are described below in conjunction with the accompanying drawings and examples. The following description and drawings are used to illustrate the principles of the present application by way of example, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0049] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, the terms "first", "second", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not used to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0051] In the present application, referring to "embodiments" means that the specific features or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0052] The following first explains the terms related to the embodiments of the present application.

[0053] 1. Battery cell

[0054] The battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material through charging after discharging the battery cell.

[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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, a negative electrode-free battery, etc., and the present application is not limited thereto.

[0056] The type of the battery cell can also be a laminated battery cell, a soft-pack battery cell, a square can battery cell, or a cylindrical battery cell, etc., and the present application is not limited thereto.

[0057] 2. Battery device

[0058] The battery device can include at least one battery cell assembly for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0059] The battery cell assembly is usually formed by arranging a plurality of battery cells. As an example, the battery cell assembly is a battery module formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0060] The battery device can also be a battery pack including a case and one or more battery cell assemblies accommodated in the case.

[0061] 3. Energy storage device

[0062] The energy storage device includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device. The battery cluster can also be understood as the energy storage unit described below.

[0063] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output electric energy at an appropriate time. For example, the energy storage device can store electric energy during a low electricity consumption period and provide electric energy for relevant users or electric equipment during a high electricity consumption period. The energy storage system provided in the present application can be any power system that needs to use an energy storage device.

[0064] In one possible example, the energy storage device is an energy storage container or an energy storage cabinet. When the energy storage device is an energy storage cabinet, the battery cluster can be understood as an electric box in the cabinet.

[0065] In one possible example, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0066] In one possible example, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, a fire-fighting module, etc.

[0067] As an example, the thermal management module can include a liquid cooling unit, which provides a cooling liquid for adjusting the temperature of the battery monomer to each battery device through a pipeline.

[0068] As an example, the master control module can be a battery management unit of the battery cluster, which is used to monitor and manage the battery cluster. The master control module can monitor the current, voltage, power, or temperature, etc. of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, etc. The SBMU can be used to be responsible for functions such as data integration, state management, safety protection, and communication coordination at the battery monomer level.

[0069] As an example, the general control module can be a battery management unit of the energy storage device, which can be used to monitor and manage the energy storage device. For example, the general control module can monitor the current, voltage, power, state of charge, or temperature, etc. of the energy storage device, and for another example, the charging and discharging current and voltage of the energy storage device can be controlled.

[0070] As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an ethernet (ETH), and an optical fiber conversion module, etc.

[0071] As an example, the fire-fighting system includes a control panel, a detector, an alarm device, etc., for detecting, alarming or extinguishing the energy storage system.

[0072] As an example, the power distribution device can be used to distribute power to the energy storage device power consumption module.

[0073] As described in the background, the energy storage device in the circuit-off state will continue to consume the stored power, which will gradually reduce the remaining stored power of the energy storage device, thereby causing the total power supply time of the energy storage device to be shortened. Specifically, when the energy storage device is in the circuit-off state, part of the chips in the energy storage device is still in the working state, and the battery device in the energy storage device needs to provide power for the chips in the working state to maintain the normal operation of the part of the chips, so the energy storage device will continue to consume the stored power when it is in the circuit-off state. The circuit-off state can also be understood as a non-high-voltage online state.

[0074] Therefore, the present 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, the first energy storage unit is any one of the at least one energy storage unit, the first energy storage unit includes a first CSC and at least one first battery device, the first CSC is used for real-time detection of parameters of the battery device, the first CSC includes a first AFE chip, the first AFE chip and the at least one first battery device are electrically connected, the first AFE chip can include at least one AFE chip, that is, the first CSC includes at least one AFE chip corresponding to the at least one first battery device, or the first AFE chip is one AFE chip, which is electrically connected to the at least one first battery device and is used for performing sampling functions (such as voltage sampling, current sampling and temperature sampling) and balancing functions on the at least one first battery device, and the working 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 it is determined that the energy storage device is in the circuit-off state according to the parameters indicating the working 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 working state to the sleep state. Since the operation of the first AFE chip needs to be powered by 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, which can reduce the consumption of the first AFE chip to the power of the first battery device, thereby reducing the consumption of the stored power of the energy storage device in the circuit-off state.

[0075] When the energy storage device is in the circuit-off state, the AFE chip can stop working, and thus by instructing the AFE chip to switch from the working state to the sleep state when the energy storage device is in the sleep state, the power consumption of the AFE chip on the battery device electrically connected to the AFE chip can be reduced, and thus the stored power consumed when the energy storage device is in the circuit-off state can be reduced.

[0076] Figure 1 A schematic diagram of an application scenario of the energy saving method of the embodiments of the present application is shown. As shown in Figure 1 different electrical equipment, such as electric vehicles, trucks, etc., can be charged from a charging network installed with one or more energy storage devices when needed, which can also be understood as an energy storage station or an 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 the at least one energy storage unit, for example, the control module is used to charge and discharge protection of the energy storage unit according to the data of the battery device in the energy storage unit, etc. An example of the control module can be a battery management unit, which can include an SBMU, and can also include an MBMU, and can also include a battery management system (BMS), which is not limited. For ease of description, the following is described by taking the battery management unit as an SBMU.

[0077] Figure 2 A schematic block diagram of an energy storage device of an embodiment of the present application is shown. As shown in Figure 2 the energy storage device includes a master control box and at least one energy storage unit, which are 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 end (+) and a first negative power supply end (-), at least one energy storage unit is connected in series through the first positive power supply end and the first negative power supply end, and the energy storage device is configured to provide direct current. The master control box includes a main positive relay, a main negative relay and an SBMU, the main positive relay includes a second positive power supply end and a third positive power supply end, the main negative relay includes a second negative power supply end and a third negative power supply end, the third positive power supply end of the main positive relay is connected with the first positive power supply end of the energy storage unit 1, the second positive power supply end of the main positive relay is connected with the positive port of the external load device, the third negative power supply end of the main negative relay is connected with the first negative power supply end of the energy storage unit n, and the second negative power supply end of the main negative relay is connected with the negative port of the external load device, so as to provide direct current. The main positive relay can be used to control the on-off of the high-voltage loop between the positive power supply end of the energy storage unit and the external load device. The main negative relay can be used to control the closed loop of the high-voltage loop between the negative power supply end of the energy storage unit and the external load device. As an example, the energy storage unit can be an electric box, and the energy storage device can be an electric cabinet, which includes one or more electric boxes. Among them, Figure 2The SBMU in the above embodiment can be replaced by an MBMU or a BMS, etc.

[0078] Each of the n energy storage units comprises a CSC and at least one battery device, i.e., battery device 1,..., battery device m-1 and battery device m (m is a positive integer), and the m battery devices are connected in series with each other. The CSC comprises a microcontroller unit (MCU) and at least one AFE chip, i.e., AFE chip 1,..., AFE chip m-1 and AFE chip m, and one AFE chip is electrically connected to one battery device. The AFE chip can also be used to perform the balancing function. Alternatively, one CSC can comprise one AFE chip which is electrically connected to all the battery devices in the energy storage unit for collecting the voltage, current and temperature data of the battery devices. The AFE chip can be replaced by other terms such as a collection chip, etc. In addition, the MCU and the m AFE chips are communicatively connected so as to be able to control the m AFE chips. The SBMU can provide power to the MCU. In addition, the MCU can be used for data processing, interface management and communication, etc.

[0079] The SBMU and the CSC can communicate through a double cluster controller area network (CCAN) bus, i.e., two CCAN buses are deployed between the SBMU and the CSC for communication, i.e., CCAN-H and CCAN-L, 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 through two wires.

[0080] Figure 3 A schematic flowchart of an energy-saving method 300 according to an embodiment of the present application is shown. Optionally, the execution subject of the method 300 can be the SBMU. The method 300 comprises the following steps.

[0081] S310, the SBMU acquires first information, and the first information comprises a parameter for indicating the working state of the energy storage device.

[0082] S320, when it is determined according to the first information that the energy storage device is in a circuit-off state, the SBMU sends a first instruction to the first CSC, and the first instruction is used to instruct the first AFE chip to switch from a working state to a sleep state.

[0083] The working state of the energy storage device is determined according to at least one energy storage unit, i.e., the working state of the energy storage device is determined by referring to the information of each of the at least one energy storage unit, such as the current value, the voltage value, etc.

[0084] Since the first AFE chip needs to be powered by 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, which can reduce the consumption of the first AFE chip on the power of the first battery device, thereby reducing the storage power consumed when the energy storage device is in the circuit-off state.

[0085] Specifically, when the energy storage device is in the circuit-off 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 sleep state when the energy storage device is in the circuit-off state, the power consumption of the AFE chip on the battery device corresponding to the AFE chip can be reduced, thereby reducing the storage power consumed when the energy storage device is in the circuit-off state.

[0086] When the energy storage device is in the circuit-off state, it can mean that the energy storage device has been disconnected from the high-voltage grid or the load end, i.e., the energy storage device has stopped supplying power externally. When the energy storage device is in the high-voltage online state, it can mean that the energy storage device has been connected to the high-voltage grid or the load end.

[0087] The working state of the energy storage device includes but is not limited to: circuit-on state, circuit-off state, standby state, sleep state, frequency modulation state, or off-grid state, etc. Among them, the circuit-on state can also be understood as the high-voltage online state. The circuit-on state includes the charging state and the discharging state. Different working states correspond to different working state parameters, i.e., the SBMW can identify the corresponding working state through different working state parameters. For example, when the main positive relay is in the closed state, the main negative relay is in the closed state, 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 in the non-closed state, the main negative relay is in the non-closed state, 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 in the closed state, the main negative relay is in the closed state, and the current value is less than B3 A, the energy storage device is in the standby state. For example, when the main positive relay is in the non-closed state, the main negative relay is in the non-closed state, and the CSC is in the non-power supply state, the energy storage device is in the sleep state. In addition, the working state of the energy storage device is determined according to at least one energy storage unit. For example, the working state of the energy storage device is related to the output current value of each energy storage unit, when the total output current value of the at least one energy storage unit is greater than B1 A, and the main positive relay is in the closed state and the main negative relay is in the closed state, the energy storage device is in the circuit-on state.

[0088] Exemplarily, the SBMU can identify the working state of the energy storage device as the charging state through working state parameters such as “gradual increase in current value + gradual increase in state of charge (SOC) + gradual increase in temperature (≤45°C)” and the like.

[0089] Exemplarily, the SBMU can identify the working state of the energy storage device as the discharging state through working state parameters such as “gradual decrease in current value + decrease in SOC + power matching load + gradual decrease in voltage” and the like.

[0090] Exemplarily, the SBMU can identify the working state of the energy storage device as the frequency modulation state through working state parameters such as “high-frequency positive-negative switching of power + SOC maintained at 40%-60% + automatic gain control (AGC) instruction response rate > 95%” and the like.

[0091] Exemplarily, the SBMU can identify the working state of the energy storage device as the off-grid state through working state parameters such as “grid voltage = 0 + power conversion system (PCS) autonomous output voltage + local load current > 0” and the like.

[0092] Exemplarily, the SBMU can identify the working state of the energy storage device as the hibernation state through working state parameters such as “current ≈ 0 + communication module hibernation + self-consumption < 5W + relay disconnection” and the like.

[0093] Exemplarily, the SBMU can identify the working state of the energy storage device as the circuit disconnection state through working state parameters such as “high-voltage bus voltage ≈ 0V, current absolute value < 5A, or charging and discharging power ≈ 0kW” and the like.

[0094] The above-mentioned various working state parameters can be determined by a sensor built in the energy storage device. The sensor can feed back the working state parameters obtained by it to the SBMU. In this way, the SBMU can identify the working state of the energy storage device through the above-mentioned working state parameters. The setting mode of the sensor and the content of information interaction between the sensor and the SBMU will not be described herein.

[0095] When the SBMU determines that the energy storage device is in the circuit disconnection state according to the parameter included in the first information, the SBMU can send a first instruction to the first CSC so as to trigger the first AFE chip to switch from the working state to the hibernation state. When the first AFE chip includes one AFE chip, the SBMU instructs the one AFE chip to switch from the working state to the hibernation state. When the first AFE chip includes at least one AFE chip, the SBMU instructs all the AFE chips in the at least one AFE chip to switch from the working state to the hibernation state. Alternatively, the SBMU can also instruct part of the AFE chips in the at least one AFE chip to switch from the working state to the hibernation state.

[0096] After the first CSC receives the first instruction, the first CSC can immediately control the first AFE chip to switch from the working state to the hibernation state according to the first instruction, or the first CSC can control the first AFE chip to switch from the working state to the hibernation state after a period of time after receiving the first instruction, which is not limited. The process or flow of how the first CSC controls the first AFE chip to switch from the working state to the hibernation state is not described again.

[0097] One possible implementation, the energy storage device does not have a power output disconnection fault. When the energy storage device does not have a power output disconnection fault, it can mean that the reason why the energy storage device is in the circuit disconnection state is not because of the power output disconnection fault, so that the SBMU can instruct the first AFE chip to switch from the working state to the hibernation state on the premise of ensuring the safety of the energy storage device.

[0098] Specifically, the energy storage device will have various faults, and different faults will have different manifestations, such as overcurrent fault, battery cell voltage invalid fault, etc. Since the power output disconnection fault is a relatively serious 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 the circuit disconnection state, the SBMU can instruct the first AFE chip to switch from the working state to the hibernation state.

[0099] One possible implementation, the first instruction for instructing the first AFE chip to switch from the working state to the hibernation state includes:

[0100] The first instruction is used to instruct the first AFE chip to stop performing the sampling function on the at least one first battery device, and / or,

[0101] The first instruction is used to instruct the first AFE chip to stop performing the balancing function on the at least one first battery device.

[0102] When the first instruction is used to instruct the first AFE chip to stop performing the sampling function on the first battery device, since the first AFE chip does not sample the first battery device, this can reduce the consumption of the first AFE chip on the power of the first battery device. When the first instruction is used to instruct the first AFE chip to stop performing the balancing function on the first battery device, since the first AFE chip does not perform the balancing function on the first battery device, this can reduce the consumption of the first AFE chip on the power of the first battery device. When the first instruction is used to instruct the first AFE chip to stop performing the sampling function and the balancing function on the first battery device, this can further reduce the consumption of the first AFE chip on the power of the first battery device.

[0103] The first AFE chip switching from the working state to the dormant state can include various forms. For example, the first AFE chip stops performing the sampling function on the battery device, for another example, the first AFE chip stops performing the balancing function on the battery device, for another example, the first AFE chip stops performing the sampling function and performing the balancing function on the battery device.

[0104] When the first instruction does not explicitly indicate the specific behavior of the first AFE chip, one possible example, the first AFE chip can flexibly determine the corresponding dormant behavior, for example, the first AFE chip determines to stop performing the sampling function on the first battery device by itself, for another example, the first AFE chip determines to stop performing the balancing function on the first battery device by itself, for example, the first AFE chip determines to stop performing the sampling function and the balancing function on the first battery device by itself. Another possible example, the first AFE chip directly determines to stop performing the sampling function and the balancing function on the first battery device.

[0105] One possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the sampling function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0106] One possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the balancing function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0107] One possible implementation, the first instruction includes information for instructing the first AFE chip to stop performing the balancing function and the sampling function on the first battery device. In this way, the first AFE chip can perform the corresponding behavior according to the specific information in the first instruction.

[0108] One possible implementation, the first information includes at least one of:

[0109] The output voltage value of the first energy storage unit,

[0110] an output current value of the first energy storage unit,

[0111] a fault code of the energy storage device,

[0112] a second instruction, the second instruction being used to instruct the first CSC to switch from the working state to the sleep state, or

[0113] a balancing function state of the first CSC.

[0114] In this way, the SBMU can determine the working state of the energy storage device according to one or more of the above information.

[0115] The output voltage value of the first energy storage unit can also be determined by the first CSC through the AFE chip.

[0116] The output current value of the first energy storage unit can be obtained by a current sensor built in the first energy storage unit, or the output current value of the first energy storage unit can also be determined by the first CSC through the AFE chip.

[0117] The fault code of the energy storage device can be obtained by a sensor built in the energy storage device. For example, a sensor for monitoring or sensing whether the energy storage device has a specific fault is arranged in the energy storage device, the sensor can detect the state of the energy storage device in real time or periodically, and can send a fault code corresponding to the fault to the SBMU when detecting the corresponding fault. The mapping relationship between the fault and the fault code can be preconfigured in the sensor.

[0118] The balancing function state of the first CSC can be obtained by the first CSC itself. For example, when the balancing function state of the first CSC is in the started state, the first CSC can send information to the SBMU indicating that the balancing function state of the first CSC is in the started state. For another example, when the balancing function state of the first CSC is in the closed state, the first CSC can send information to the SBMU indicating that the balancing function state of the first CSC is in the closed state. In this way, the SBMU can determine the balancing function state of the first CSC, and can determine the working state of the energy storage device according to the balancing function state of the first CSC, for example, when the balancing function state of the first CSC is in the started state.

[0119] The SBMU can receive the second instruction from the external device, and thus the SBMU can determine that the energy storage device is in the circuit disconnected state according to the second instruction indicating that the first CSC switches from the working state to the sleep state.

[0120] In one possible implementation, the energy storage device 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 with the at least one second battery device, and the first information further includes at least one of:

[0121] an output voltage value of the second energy storage unit,

[0122] an output current value of the second energy storage unit, or

[0123] an equalization function status of the second CSC.

[0124] In this way, the SBMU can determine whether the energy storage device is in the circuit disconnection state through the information of the plurality of energy storage units, thereby improving the accuracy of the determination of the SBMU.

[0125] In one possible implementation, the SBMU determines that the energy storage device is in the circuit disconnection state according to the first information, including:

[0126] when the SBMU determines that the energy storage device satisfies at least one of the first conditions according to the first information, the SBMU determines that the energy storage device is in the circuit disconnection state.

[0127] The first condition is:

[0128] an output current value of the first energy storage unit is less than or equal to a first current threshold value;

[0129] an output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value;

[0130] an equalization function status of the first CSC is a closed state; or

[0131] a fault code of the energy storage device does not include a power output disconnection fault code.

[0132] In this way, the energy storage device is determined to be in the circuit disconnection state by setting one or more of the above conditions, which can improve the accuracy of the determination of the SBMU that the energy storage device is in the circuit disconnection state.

[0133] When the first information comprises the output current value of the first energy storage unit, the SBMU can determine whether the energy storage device is in the circuit disconnect state according to the size relationship between the output current threshold of the first energy storage unit and the 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 the circuit disconnect 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 the circuit disconnect state. Wherein, the first current threshold can be set to nA, n is related to the loop current after a period of time from the charge-discharge state to the stop charge-discharge state.

[0134] When the first information comprises the output voltage value of the first energy storage unit, the SBMU can determine whether the energy storage device is in the circuit disconnect state according to the size relationship between the output voltage threshold of the first energy storage unit and the 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 the circuit disconnect 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 the circuit disconnect state. Wherein, the first voltage threshold can be set to 4V.

[0135] When the first information comprises the fault code of the energy storage device, the fault code of the energy storage device does not comprise the power output disconnect fault code, and thus the SBMU can determine that the energy storage device can be in the circuit disconnect state according to that the energy storage device does not have the power output disconnect fault.

[0136] When the first information comprises the equalization function state information of the first CSC, the SBMU can determine the state of the equalization function of the first CSC according to the equalization function state information of the first CSC. For example, when the equalization function state information of the first CSC indicates that the equalization function of the first CSC is in the closed state, the SBMU can determine that the energy storage device is in the circuit disconnect state. For another example, when the equalization function state information of the first CSC indicates that the equalization function of the first CSC is in the open state, the SBMU can determine that the energy storage device is not in the circuit disconnect state.

[0137] In one possible implementation, the energy storage device further comprises at least one energy storage unit, and the first information further comprises the equalization function state information of the CSC in the at least one energy storage unit. Thus, the SBMU can determine whether the energy storage device is in the circuit disconnect state according to the equalization function state information of all the CSCs in the energy storage device, which can improve the accuracy of the SBMU in determining that the energy storage device is in the circuit disconnect state.

[0138] For example, when the SBMU determines that the equalization function status of all the CSCs in the energy storage device is the closed status, the SBMU can determine that the energy storage device is in the circuit open status. In addition, when the SBMU determines that the equalization function status of part of the CSCs in the energy storage device is the closed status, the SBMU can determine that the energy storage device is not in the circuit open status.

[0139] In one possible implementation, the first information further includes an output current value of the energy storage device. In this way, the SBMU can determine whether the energy storage device is in the circuit open status according to the output current value of the energy storage device, which can improve the accuracy of the determination of the SBMU.

[0140] For example, when the SBMU determines that the output current value of the energy storage device is less than or equal to a threshold value, the SBMU can determine that the energy storage device is in the circuit open status. When the SBMU determines that the output current value of the energy storage device is greater than the threshold value, the SBMU can determine that the energy storage device is not in the circuit open status. The threshold value can be set according to the number of battery cells in the energy storage device, for example, the threshold value is equal to m A, and m is a numerical value of the total number of battery cells in the energy storage device.

[0141] The above examples are described by taking that the energy storage device satisfies one first condition as an example, but the scene in which the energy storage device satisfies one or more first conditions is not limited, 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 value and the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value, 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 value and the fault code of the energy storage device does not include a power output open fault code; for example, the SBMU determines that the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value and the fault code of the energy storage device does not include a power output open fault code; for example, the SBMU determines that the output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value, the fault code of the energy storage device does not include a power output open fault code, and the output current value of the first energy storage unit is less than or equal to a first current threshold value, and the like.

[0142] In one possible implementation, the SBMU determines that the energy storage device is in the circuit open status when the SBMU determines that the energy storage device satisfies at least one first condition according to the first information, including:

[0143] When the SBMU determines that the energy storage device satisfies at least one first condition for a duration of T time units, the SBMU determines that the energy storage device is in the circuit open status, and T is a positive integer.

[0144] In this way, by setting the feature of T time units, the reliability of the SBMU determining that the energy storage device is in the circuit open status can be improved.

[0145] The energy storage device can meet different first conditions at different times, respectively. For example, the energy storage device meets a first first condition at time 1, meets a second first condition at time 2, and meets a third first condition at time 3. Time 1, time 2, and time 3 are three different times, and the duration of meeting each first condition is T time units. The time unit can be a second, a minute, or the like. T is a positive integer.

[0146] In one possible implementation, the method 300 further includes:

[0147] The SBMU receives second information from the first CSC, where the second information is used to indicate that the first AFE chip has switched from the working state to the sleep state.

[0148] The SBMU sends, to the first CSC according to the second information, third instructions used to instruct the first CSC to switch from the working state to the sleep state.

[0149] In this way, the SBMU can instruct the first CSC to switch from the working state to the sleep state when it is determined that the first AFE chip is in the sleep state, which can further reduce the power consumption of the energy storage device in the circuit disconnection state.

[0150] Specifically, when the SBMU sends the first instructions to the first CSC to trigger the first AFE chip to switch from the working state to the sleep state, the first CSC can feed back to the SBMU the state switching of the first AFE chip. When the first CSC feeds back 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.

[0151] The SBMU can send the first instructions to the first CSC multiple times until the first CSC feeds back to the SBMU that the first AFE chip has switched from the working state to the sleep state, and then the SBMU stops sending the first instructions to the first CSC. Therefore, the second information can be that the first CSC sends the second information to the SBMU after receiving one first instruction, or the second information can be that the first CSC sends the second information to the SBMU after receiving multiple first instructions, which is not limited.

[0152] In one possible implementation, the method 300 further includes:

[0153] The SBMU stops supplying power to the first CSC.

[0154] In this way, the power consumption of the energy storage device in the circuit disconnection state can be further reduced.

[0155] In one possible implementation, the method 300 further includes:

[0156] The SBMU sends a fourth instruction to the first CSC when it is determined that the energy storage device meets any of the following second conditions, the fourth instruction being used to instruct the first CSC to switch from the sleep state to the working state;

[0157] The second conditions include:

[0158] The SBMU receives a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from the circuit disconnected state to the circuit connected state;

[0159] The output current value of the first energy storage unit at a first time is greater than or equal to a second current threshold, the first time being after the time when the first CSC is in the sleep state;

[0160] The output voltage value of the first energy storage unit at a second time is greater than or equal to a second voltage threshold, the second time being after the time when the first CSC is in the sleep state;

[0161] The SBMU receives a sixth instruction, the sixth instruction being used to instruct the first CSC to switch from the sleep state to the working state;

[0162] The duration after the first CSC switches from the working state to the sleep state is greater than K time units, K being a positive integer; or,

[0163] The SBMU receives a high-voltage fault code of the energy storage device.

[0164] By setting the second conditions, it can be achieved that the first CSC can switch from the sleep state to the working state, and further, the mutual switching between the sleep state and the working state of the first CSC can be achieved.

[0165] In one possible example, the second conditions include that the SBMU receives the fifth instruction, the fifth instruction can come from an external device, such as an application installed in the terminal, when the terminal can perceive that the external load device has a charging demand, the terminal can send the fifth instruction to the SBMU in order to trigger the first CSC to switch from the sleep state to the working state.

[0166] A possible example, the second condition includes: the output current value of the first energy storage unit at the first time is greater than or equal to a second current threshold value, the SBMU can perceive the output current value of the first energy storage unit at the first time through the current sensor built in the energy storage device, and compare the output current value of the first energy storage unit at the first time with the preset second current threshold value, when it is determined that the output current value of the first energy storage unit at the first time is greater than or equal to the second current threshold value, the SBMU can send the fourth instruction to the first CSC. Wherein, when the SBMU determines that the output current value of the first energy storage unit at the first time is less than the second current threshold value, the SBMU determines not to trigger the first CSC to switch from the sleep state to the working state. In addition, the SBMU can also determine not to trigger the first CSC to switch from the sleep state to the working state when it is determined that the output current value of the first energy storage unit at the first time is equal to the second current threshold value. Wherein, the second current threshold value can be set to 1A or other values.

[0167] A possible implementation, the duration that the output current value of the first energy storage unit at the first time is greater than or equal to the second current threshold value is greater than a time threshold value, which can be 1 second or the like. In this way, the accuracy of the SBMU judgment can be improved.

[0168] A possible example, the second condition includes: the output voltage value of the first energy storage unit at the second time is greater than or equal to a second voltage threshold value, the SBMU can perceive the output voltage value of the first energy storage unit at the second time through the current sensor built in the energy storage device, and compare the output voltage value of the first energy storage unit at the second time with the preset second voltage threshold value, when it is determined that the output voltage value of the first energy storage unit at the second time is greater than or equal to the second voltage threshold value, the SBMU can send the fourth instruction to the first CSC. Wherein, when the SBMU determines that the output voltage value of the first energy storage unit at the second time is less than the second voltage threshold value, the SBMU determines not to trigger the first CSC to switch from the sleep state to the working state. In addition, the SBMU can also determine not to trigger the first CSC to switch from the sleep state to the working state when it is determined that the output voltage value of the first energy storage unit at the second time is equal to the second voltage threshold value. Wherein, for example, the second voltage threshold value can be set to n*10mv, n represents the number of battery monomers in the first energy storage unit.

[0169] A possible implementation, the absolute value of the difference between the output voltage value of the first energy storage unit at the second time and the output voltage value of the first energy storage unit at the time when the first CSC is in the sleep state is greater than or equal to a voltage threshold value. Wherein, the voltage threshold value can be 10*n mV or the like, n is the number of battery devices in the first energy storage unit. In this way, the accuracy of the SBMU in judging that the energy storage device is in the circuit disconnected state can be improved.

[0170] One possible example, the second condition includes: the SBMU receives a sixth instruction, the sixth instruction is used to instruct the first CSC to switch from the sleep state to the working state. Wherein, the SBMU can receive the sixth instruction from the external device.

[0171] One possible example, the second condition includes: the duration after the first CSC switches from the working state to the sleep state is greater than K time units, for example, after determining that the first CSC switches from the working state to the sleep state, the SBMU can set a timer, such as 30 minutes, and the SBMU can send the fourth instruction to the first CSC after the countdown of the timer ends.

[0172] One possible example, the second condition: the SBMU receives a power output disconnection fault code of the energy storage device. For example, the SBMU can monitor the state of the energy storage device through the sensor built-in the energy storage device, when the sensor determines that the energy storage device has a power output disconnection fault, the sensor sends a power output disconnection fault code to the SBMU, and the SBMU determines that the energy storage device has a power output disconnection fault according to the power output disconnection fault code, and then triggers the first CSC to switch from the sleep state to the working state through the fourth instruction. In addition, the above-mentioned power output disconnection fault code of the energy storage device can also represent that the energy storage device has a fault of level 4 and above.

[0173] The above is that the SBMU instructs 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 that the SBMU instructs the AFE chip in all energy storage units in the energy storage device to switch from the working state to the sleep state.

[0174] The above method is described in combination with specific examples below.

[0175] 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 state of the first CSC, and the SBMU determines whether the energy storage device is in the circuit disconnection state according to the above information and in combination with the first condition. The SBMU can determine that the energy storage device is in the circuit disconnection state when it determines that the energy storage device satisfies all the first conditions according to all the contents in the first information.

[0176] One possible example, the first information obtained by the SBMU includes the equalization function state 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, and the SBMU determines whether the energy storage device is in the circuit disconnection state according to the above information and in combination with the first condition. The SBMU can determine that the energy storage device is in the circuit disconnection state when it determines that the energy storage device satisfies all the first conditions according to all the contents in the first information.

[0177] 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 state of the first CSC. The SBMU determines whether the energy storage device is in the circuit disconnection state according to the above information and in combination with the first conditions. When the SBMU determines that the energy storage device satisfies all the first conditions and the duration of satisfaction of each first condition is greater than or equal to T time units according to all the contents in the first information, the SBMU can determine that the energy storage device is in the circuit disconnection state.

[0178] In one possible example, the first information obtained by the SBMU includes the equalization function state information of all the 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. The SBMU determines whether the energy storage device is in the circuit disconnection state according to the above information and in combination with the first conditions. When the SBMU determines that the energy storage device satisfies all the first conditions and the duration of satisfaction of each first condition is greater than or equal to T time units according to all the contents in the first information, the SBMU can determine that the energy storage device is in the circuit disconnection state.

[0179] The above description is based on the example that the energy storage device is in the circuit disconnection state. When the energy storage device is in the transportation process, the embodiments of the present application can also support reducing the storage power consumed by the energy storage device in the transportation process. The transportation process refers to the process of transporting the energy storage device from the place of origin to the customer location. At this time, the SBMU, the MBMU, and the SCS of the energy storage device are not powered, and the entire container is in an inactive state. In addition, whether the energy storage device is in the transportation process can be determined by determining whether the energy storage device has 24V power supply. For example, when the energy storage device does not have 24V power supply, it can be determined that the energy storage device is in the transportation process. When the energy storage device has 24V power supply, it can be determined that the energy storage device is not in the transportation process.

[0180] When the energy storage device is in the transportation process, the AFE chip can be instructed to stop performing the sampling function and / or the equalization function on the battery device by manual or other means. For example, the external device can send an instruction to the AFE chip through the MCU in the CSC, and the instruction is used to instruct the AFE chip to stop performing the sampling function and / or the equalization function on the battery device. In this way, the storage power consumed by the energy storage device in the transportation process can be reduced. The CSC can be powered by a 24V power supply provided by a person.

[0181] The foregoing is described by taking the battery management unit as the SBMU as an example. When the battery management unit is the MBMU or the BMS, the MBMU or the BMS can acquire the first information from the SBMU and send the first instruction to the SBMU, or the MBMU or the BMS can acquire the first information in the manner of acquiring the first information through the foregoing SBMU, and no limitation is made in this regard.

[0182] The energy saving method of the embodiment of the application is described above, and the energy storage device of the embodiment of the application will be described below. The energy storage device can execute the energy saving method 300.

[0183] Figure 4 A schematic block diagram of the energy storage device 400 of the embodiment of the application is shown. As shown in the figure, Figure 4 The energy storage device 400 can include:

[0184] The communication unit 410 is configured to acquire first information, the first information including a parameter used to indicate the working state of the energy storage device;

[0185] The processing unit 420 is configured to send a first instruction to the first CSC when it is determined according to the first information that the energy storage device is in the circuit disconnection state, the first instruction being used to instruct the first AFE chip to switch from the working state to the dormant state.

[0186] The energy storage device 400 can implement the corresponding operations in the energy saving method 300, and for the sake of brevity, no longer be described here.

[0187] Figure 5 A hardware structure schematic diagram of the energy storage device 500 of the embodiment of the application is shown. The energy storage device 500 includes a memory 501, a processor 502, a communication interface 503, and a bus 504. The memory 501, the processor 502, and the communication interface 503 are in communication connection with each other through the bus 504.

[0188] The memory 501 can be a read-only memory (ROM), a static storage device, and a random access memory (RAM). The memory 501 can store a program, 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.

[0189] The processor 502 can be a general purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits, for executing programs as needed to implement the functions of the units in the apparatus of the embodiments of the present application, or to execute the energy saving method 300.

[0190] The processor 502 can also be an integrated circuit chip having a processing capability for signals. In the implementation process, the various steps of the energy saving method 300 can be completed by the integrated logic circuit of hardware in the processor 502 or the instructions in the form of software.

[0191] The processor 502 can also be a general purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as a hardware processor for execution, or executed by a combination of hardware and software modules in the processor. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory 501, and the processor 502 reads the information in the memory 501, and combines the hardware to complete the functions required to be executed by the units included in the energy storage device 500, or to execute the energy saving method 300.

[0192] The communication interface 503 uses a transceiver such as but not limited to a transceiver to realize the communication between the energy storage device 500 and other devices or communication networks.

[0193] The bus 504 can include a path for transmitting information between the various components (e.g., the memory 501, the processor 502, the communication interface 503) of the energy storage device 500.

[0194] Although the energy storage device 500 only shows the storage, the processor, the communication interface, in the specific implementation process, those skilled in the art should understand that the energy storage device 500 can also include other devices necessary for normal operation. At the same time, according to the specific needs, those skilled in the art should understand that the energy storage device 500 can also include hardware devices for realizing other additional functions. In addition, those skilled in the art should understand that the energy storage device 500 can also only include devices necessary for the implementation of the embodiments of the present application, and does not necessarily include Figure 5 all the devices shown in the prior art.

[0195] The embodiments of the present application also provide a battery management unit, which comprises a processor and a memory, the memory is used for storing a program; the processor is used for executing the program stored in the memory, and when the program stored in the memory is executed, the processor is used for executing the energy saving method 300.

[0196] The embodiments of the present application also provide an energy storage system, which comprises a power conversion device and the aforementioned energy storage device, and the power conversion device is used for electrically connecting the power generation device and the energy storage device. Wherein, the power conversion device can be understood as PCS, etc.

[0197] The embodiments of the present application also provide a charging network, which comprises a charging pile and the aforementioned energy storage device, and the energy storage device is used for providing electric energy for the charging pile.

[0198] The embodiments of the present application also provide a charging network, which comprises a charging pile and the aforementioned energy storage system, and the aforementioned energy storage system is used for providing electric energy for the charging pile.

[0199] The embodiments of the present application also provide a computer readable storage medium, which is used for storing a computer program, and the computer program is used for executing the method of the various embodiments of the present application.

[0200] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0201] The embodiments of the present application also provide a computer program product, which comprises a computer program stored on a computer readable storage medium, and the computer program comprises program instructions, when the program instructions are executed by a computer, the computer executes the energy saving method of the energy storage device.

[0202] The above examples are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application is described with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features thereof can be replaced by equivalent ones, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy saving method, characterized by, The method comprises: a battery management unit acquires first information, the first information comprising a parameter indicating an operating state of an energy storage device, the energy storage device comprising 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 battery monitoring circuit and at least one first battery device, the first battery monitoring circuit comprising a first analog front-end chip, the at least one first battery device providing electrical energy for the first analog front-end chip, the first analog front-end chip being configured to collect performance parameters of the at least one first battery device, the operating state of the energy storage device being determined with reference to information of each energy storage unit in the at least one energy storage unit; when the battery management unit determines that the energy storage device is in a circuit disconnection state according to the first information, the battery management unit sends a first instruction to the first battery monitoring circuit, the first instruction being used to instruct the first analog front-end chip to switch from an operating state to a dormant state; the battery management unit receives 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 operating state to the dormant state; the battery management unit sends a third instruction to the first battery monitoring circuit according to the second information, the third instruction being used to instruct the first battery monitoring circuit to switch from the operating state to the dormant state; the battery management unit stops supplying electrical energy for the first battery monitoring circuit.

2. The method of claim 1, wherein, The determination that the energy storage device is in the circuit disconnection state according to the first information comprises: when the battery management unit determines that the energy storage device satisfies at least one first condition according to the first information, the battery management unit determines that the energy storage device is in the circuit disconnection state; the first condition comprises: an output current value of the first energy storage unit is less than or equal to a first current threshold value; an output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value; an equalization function state of the first battery monitoring circuit is a closed state; or a fault code of the energy storage device does not comprise a power output disconnection fault code.

3. The method of claim 2, wherein, The determination that the energy storage device is in the circuit disconnection state according to the first information comprises: when the battery management unit determines that the first condition is satisfied for a duration of T time units, the battery management unit determines that the energy storage device is in the circuit disconnection state, T being a positive integer.

4. The method according to any one of claims 1 to 3, characterized in that, The first information comprises at least one of: 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 state information of the first battery monitoring circuit, or a second instruction, the second instruction being used to instruct the first battery monitoring circuit to switch from the operating state to the dormant state.

5. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: when the battery management unit determines that the energy storage device satisfies any one of second conditions, the battery management unit sends a fourth instruction to the first battery monitoring circuit, the fourth instruction being used to instruct the first battery monitoring circuit to switch from the dormant state to the operating state; the second condition comprises: receiving a fifth instruction, the fifth instruction being used to instruct the energy storage device to switch from the circuit disconnection state to the circuit connection state; The output current value of the first energy storage unit at a first time is greater than or equal to a second current threshold, and the first time is after the first battery monitoring circuit is in a sleep state; The output voltage value of the first energy storage unit at a second time is greater than or equal to a second voltage threshold, and the second time is after the first battery monitoring circuit is in a sleep state; A sixth instruction is received, and the sixth instruction is used to instruct the first battery monitoring circuit to switch from the sleep state to the working state; The sleep duration of the first battery monitoring circuit is greater than or equal to K time units, and K is a positive integer; or A power output disconnection fault code of the energy storage device is received.

6. 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 the working state to the sleep state, and the first instruction comprises: The first instruction is used to instruct the first analog front-end chip to stop performing the sampling function 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.

7. The method of claim 4, wherein, The at least one energy storage unit further comprises a second energy storage unit, the second energy storage unit comprises a second battery monitoring circuit and at least one second battery device, the second battery monitoring circuit comprises a second analog front-end chip, the second analog front-end chip is electrically connected with the at least one second battery device, and the first information further comprises at least one of the following: An output voltage value of the second energy storage unit, An output current value of the second energy storage unit, or Equalization function state information of the second battery monitoring circuit.

8. 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.

9. An energy storage device, characterized by, The energy storage device comprises a battery management unit and at least one energy storage unit, the at least one energy storage unit comprises a first energy storage unit, the first energy storage unit comprises a first battery monitoring circuit and at least one first battery device, the first battery monitoring circuit comprises a first analog front-end chip, the at least one first battery device provides electric energy for the first analog front-end chip, the first analog front-end chip is used to collect performance parameters of the at least one first battery device, and a working state of the energy storage device is determined by referring to information of each energy storage unit in the at least one energy storage unit; The battery management unit is used to: Obtain first information, the first information comprises a parameter used to instruct a working state of the energy storage device; When it is determined according to the first information that the energy storage device is in a circuit disconnection state, 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; Second information is received from the first battery monitoring circuit, the second information is used to instruct that the first analog front-end chip has switched from the working state to the sleep state; According to the second information, a third instruction is sent to the first battery monitoring circuit, the third instruction is used to instruct the first battery monitoring circuit to switch from the working state to the sleep state; Power supply for the first battery monitoring circuit is stopped.

10. The energy storage device of claim 9, wherein, The determining that the energy storage device is in the circuit open state according to the first information comprises: determining that the energy storage device is in the circuit open state when the energy storage device satisfies at least one of the following first conditions according to the first information; The first condition is: an output current value of the first energy storage unit is less than or equal to a first current threshold value; an output voltage value of the first energy storage unit is less than or equal to a first voltage threshold value; an equalization function state of the first battery monitoring circuit is a closed state; or a fault code of the energy storage device does not include a power output open fault code.

11. An energy storage system characterized by, The energy storage device according to claim 9 or 10, wherein the power conversion device is configured to electrically connect the power generation device and the energy storage device.

12. A charging network characterized in that, The energy storage device according to claim 9 or 10, wherein the energy storage device is configured to provide electric energy for the charging pile.

13. A charging network characterized in that, The energy storage system according to claim 11, wherein the energy storage device is configured to provide electric energy for the charging pile.

14. An energy storage device, characterized by It comprises: a memory for storing a program; a processor for executing the program stored in the memory, and when the program stored in the memory is executed, the processor is configured to execute the energy saving method according to any one of claims 1 to 8.

15. A battery management unit, characterized by It comprises: a memory for storing a program; a processor for executing the program stored in the memory, and when the program stored in the memory is executed, the processor is configured to execute the energy saving method according to any one of claims 1 to 8.

16. A computer-readable storage medium, characterized in that, A computer program for storing a computer program, the computer program enables a computer to execute the energy saving method according to any one of claims 1 to 8.

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