Fault identification method and energy storage equipment

Abstract

The embodiment of the invention provides a fault identification method and energy storage equipment, the energy storage equipment comprises a battery module and one or more preset ports, and the battery module is used for providing output power for the preset ports or receiving input power of the preset ports; the method comprises the following steps: acquiring first power of a battery module and second power of a preset port; determining a power difference value according to the first power and the second power; and when the power difference value satisfies a preset deviation condition, determining that the energy storage equipment has a fault. The safety of the energy storage equipment can be improved, and the service life of the energy storage equipment can be prolonged.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular, relates to a fault identification method and an energy storage device. Background Art

[0002] During the operation of energy storage equipment, internal components, modules, etc. (e.g., battery packs, switch circuits) may cause safety problems (e.g., fire, explosion) due to overheating, short circuit, overcharging and other faults, endangering personal safety. Therefore, the safety protection design of energy storage equipment is very important.

[0003] In the related art, an overload protection mechanism is usually provided in the energy storage device. When the operating parameters (e.g., temperature, voltage, current, and power) of the energy storage device exceed the overload protection point, the overload protection will be triggered. However, the above method cannot timely identify faults that do not exceed the overload protection point, such as failure of some components inside the energy storage device. Since the overload protection will not be triggered in this case, it is possible that the energy storage device will operate in a faulty state for a long time, which cannot guarantee the safety of the energy storage device and reduces the service life of the energy storage device. Summary of the invention

[0004] The embodiments of the present application provide a fault identification method and an energy storage device to solve the problem that the safety of the energy storage device cannot be guaranteed and the service life of the energy storage device is reduced.

[0005] In a first aspect, an embodiment of the present application provides a fault identification method, which is applied to an energy storage device, wherein the energy storage device includes a battery module and one or more preset ports, and the battery module is used to provide output power to the preset port or receive input power of the preset port; the method includes: obtaining a first power of the battery module and a second power of the preset port; determining a power difference value based on the first power and the second power; and determining that a fault exists in the energy storage device when the power difference value meets a preset deviation condition.

[0006] In the fault identification method provided in the embodiment of the present application, the first power of the battery module and the second power of the preset port are obtained; the power difference value is determined based on the first power and the second power; when the power difference value meets the preset deviation condition, it is determined that the energy storage device has a fault. The above method determines whether the energy storage device has a fault based on the power difference value between the first power of the battery module and the second power of the preset port, and can timely identify the fault inside the energy storage device that does not exceed the overload protection point, thereby improving the safety of the energy storage device and extending the service life of the energy storage device.

[0007] In a second aspect, an embodiment of the present application provides a fault identification device, which is applied to an energy storage device, wherein the energy storage device includes a battery module and one or more preset ports, and the battery module is used to provide output power to the preset port or receive input power of the preset port; the device includes: a power acquisition module, which is used to acquire a first power of the battery module and a second power of the preset port; a difference value determination module, which is used to determine a power difference value based on the first power and the second power; and a fault identification module, which is used to determine that a fault exists in the energy storage device when the power difference value meets a preset deviation condition.

[0008] In a third aspect, an embodiment of the present application provides an energy storage device, which includes a battery module, one or more preset ports, one or more processors and a memory, and the one or more processors are used to implement any of the above-mentioned fault identification methods when executing a computer program stored in the memory.

[0009] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, any one of the above-mentioned fault identification methods is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 This is a schematic diagram of an application environment of a fault identification method provided by an embodiment of the present application;

[0012] Figure 2 is a schematic diagram of an application environment of a fault identification method provided by another embodiment of the present application;

[0013] Figure 3 It is a schematic diagram of the device structure of a fault identification method provided by an embodiment of the present application;

[0014] Figure 4 It is a flowchart of a fault identification method provided in an embodiment of the present application;

[0015] Figure 5 It is a flow chart of a method for determining a power difference value under a discharge state provided in an embodiment of the present application;

[0016] Figure 6 It is a flow chart of a method for determining a power difference value under a charging state provided in an embodiment of the present application;

[0017] Figure 7It is a structural schematic diagram of a fault identification device provided in an embodiment of the present application.

[0018] Figure 8 It is a schematic diagram of the structure of the energy storage device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present application. The described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0022] At present, battery modules have a wide range of application scenarios and can be used in various types of equipment. For example, battery modules can be used in self-moving equipment such as automobile equipment, lawn mowing equipment, sweeping equipment, and cruise equipment, and can also be used in energy storage equipment such as mobile energy storage equipment and household energy storage equipment, or other electronic equipment that needs power supply, without limitation here.

[0023] The embodiment of the present application takes the application of battery modules to energy storage devices as an example. In order to prevent the energy storage device from causing safety problems (e.g., fire, explosion) due to overheating, short circuit, overcharging and other faults, which endanger personal safety, an overload protection mechanism is usually provided in the energy storage device. When the operating parameters of the energy storage device (e.g., temperature, voltage, current and power) exceed the overload protection point, the overload protection will be triggered. Exemplarily, when the power of the output port in the energy storage device is monitored to rise sharply and exceed the power threshold, it can be determined that the output port has a short circuit or other fault, thereby triggering the power overload protection.

[0024] However, the above method cannot timely identify faults that do not exceed the overload protection point. For example, when some components inside the energy storage device fail (for example, internal micro-short circuit faults, open circuit faults, etc. of the energy storage device), the power or other parameters of the output port in the energy storage device may not change significantly, that is, it will not exceed the overload protection point, and the overload protection will not be triggered in this case. If the energy storage device operates in a faulty state for a long time, the safety of the energy storage device cannot be guaranteed and the service life of the energy storage device is reduced.

[0025] In view of the above problems, in order to solve the problem that the safety of energy storage equipment cannot be guaranteed and the service life is short, the embodiment of the present application provides a fault identification method and an energy storage device, which determines whether the energy storage device has a fault according to the power difference value between the first power of the battery module and the second power of the preset port, and can timely identify faults inside the energy storage device that do not exceed the overload protection point, thereby improving the safety of the energy storage device and extending the service life of the energy storage device.

[0026] In order to better understand a fault identification method and an energy storage device provided in an embodiment of the present application, an application environment applicable to the embodiment of the present application is first described below.

[0027] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the application environment of the fault identification method provided in the first embodiment of the present application, Figure 2 1 is a schematic diagram of an application environment of a fault identification method provided in the second embodiment of the present application. As an embodiment, the fault identification method provided in the embodiment of the present application can be applied to an energy storage device 100 .

[0028] The energy storage device 100 includes an input interface (not shown in the figure) and an output interface (not shown in the figure), and the input interface and the output interface may include a wired interface and a wireless interface (such as a wireless charging module), or may include only one of them.

[0029] Among them, the output interface can be connected to the load device 200, such as a tablet computer, a mobile phone, a laptop computer, etc., to power the load device 200; the input interface can be connected to the input source 300, such as a charger, other energy storage devices, photovoltaic components, etc., to power the energy storage device 100.

[0030] In one embodiment, if Figure 1 As shown, in a scenario where the output interface of the energy storage device 100 is connected to the load device 200, fault identification can be performed on the energy storage device 100. For example, in one scenario, the energy storage device 100 is providing power to load devices 200 such as laptops, tablet computers, and mobile phones. In this process, fault identification can be performed on the energy storage device 100 to prevent the energy storage device 100 from discharging in a faulty state.

[0031] In other embodiments, Figure 2 As shown, in a scenario where the input interface of the energy storage device 100 is connected to the input source 300, fault identification can be performed on the energy storage device 100. Exemplarily, in another scenario, the energy storage device 100 is connected to the input source 300 and is receiving electric energy provided by the input source 300 for charging. In this process, fault identification can be performed on the energy storage device 100 to prevent the energy storage device 100 from being charged in a faulty state.

[0032] In other embodiments, fault identification may also be performed on the energy storage device 100 in a scenario where the output interface of the energy storage device 100 is connected to the load device 200 and the input interface is connected to the input source 300 .

[0033] See also Figure 3 , Figure 3 1 is a schematic diagram of the device structure of the fault identification method provided in the first embodiment of the present application. The energy storage device 100 includes a battery module 10, a power conversion circuit 20, one or more preset ports 30, and a power management module 40. The battery module 10 is connected to the one or more preset ports 30 through the power conversion circuit 20, the battery module 10 is connected to the power management module 40, and the power management module 40 is connected to the one or more preset ports 30.

[0034] In one embodiment, the battery module 10 provides output power to the preset port 30 or receives input power from the preset port 30 through the power conversion circuit 20. For example, when the energy storage device 100 is in a charging state, the battery module 10 is used to receive input power from the preset port 30 to achieve power storage; when the energy storage device 100 is in a discharging state, the battery module 10 is used to provide output power to the preset port 30 to achieve power supply.

[0035] In one embodiment, the power conversion circuit 20 is used to convert one form of electrical energy into another form of electrical energy. The power conversion circuit 20 can be set according to the actual application requirements of the energy storage device 100, and is not limited here. For example, the power conversion circuit 20 may include one or more of a DC (Direct Current) / DC conversion module and an AC (Alternating Current) / DC conversion module. Among them, the DC / DC conversion module is used to boost or buck the DC power provided by the battery module 10, and the AC / DC conversion module is used to convert between AC and DC. The DC / DC conversion module can adopt a bidirectional buck-boost circuit, a single buck or single boost circuit, or other types of circuits, mainly determined by the voltage range supported by the energy storage device 100. The AC / DC conversion module can adopt a half-wave bridge rectifier circuit, a full-wave bridge rectifier circuit, or other types of circuits.

[0036] In one embodiment, the energy storage device 100 is connected to an input source through a preset port 30 to realize charging of the energy storage device 100, or the energy storage device 100 is connected to a load device through a preset port 30 to realize discharging of the energy storage device 100. The preset port 30 may include one or more of a Type C port, a Type A port, a USB port, an AC port, a car charger port, and the like.

[0037] In one embodiment, the battery module 10 includes a cell group 11, a battery management system BMS12, a charge and discharge switch circuit 13, and an analog front-end chip AFE14. The battery management system BMS12 is connected to the cell group 11 through the charge and discharge switch circuit 13, and the analog front-end chip AFE14 is respectively connected to the cell group 11 and the battery management system BMS12. Among them, the cell group 11 may include a single cell, or may include two or more cells. The number of cells is determined specifically according to the capacity of a single cell and the capacity that the energy storage device 100 needs to achieve. The battery management system BMS12 controls the charge and discharge of the cell group 11 through the charge and discharge switch circuit 13 and implements over-temperature, low temperature, overvoltage, overcurrent, undervoltage and other protections for the cell. The analog front-end chip AFE14 is used to collect various parameters of the cell group 11, such as voltage, current, temperature, etc.

[0038] In one embodiment, the charge and discharge switch circuit 13 in the battery module 10 is connected to the power conversion circuit 20, and the battery management system BMS12 is connected to the power management module 40. Exemplarily, when the energy storage device 100 is in a charging state, the energy storage device 100 is connected to the input source through the preset port 30, and the current provided by the input source is transmitted to the power conversion circuit 20 through the preset port 30. After being processed by the power conversion circuit 20, the current is transmitted to the battery cell group 11 through the charge and discharge switch circuit 13 for charging. When the energy storage device 100 is in a discharging state, the energy storage device 100 is connected to the load device through the preset port 30, and the battery cell group 11 outputs the current to the power conversion circuit 20 through the charge and discharge switch circuit 13. After being processed by the power conversion circuit 20, the current is output to the load device through the preset port 30, thereby supplying power to the load device.

[0039] In one embodiment, the battery management system BMS12 is connected to the power management module 40, and data can be exchanged between the battery management system BMS12 and the power management module 40. During the fault identification process of the energy storage device 100, the analog front-end chip AFE14 can obtain the power of the battery cell group 11 during charging and discharging, and output the power of the battery cell group 11 during charging and discharging to the battery management system BMS12. The power management module 40 obtains the power of the preset port 30 during charging and discharging.

[0040] In one embodiment, the power management module 40 can output the power of the preset port 30 during charging and discharging to the battery management system BMS12, and the battery management system BMS12 identifies whether the energy storage device 100 has a fault based on the power of the battery cell group 11 during charging and discharging and the power of the preset port 30 during charging and discharging.

[0041] In another embodiment, the battery management system BMS12 can output the power of the battery cell group 11 during charging and discharging to the power management module 40, and the power management module 40 can identify whether the energy storage device 100 is faulty based on the power of the battery cell group 11 during charging and discharging and the power of the preset port 30 during charging and discharging.

[0042] In other embodiments, the power management module 40 can output the power of the preset port 30 during charging and discharging to the battery management system BMS12, and the battery management system BMS12 can output the power of the battery cell group 11 during charging and discharging to the power management module 40. The battery management system BMS12 and the power management module 40 can respectively identify whether the energy storage device 100 has a fault according to the power of the battery cell group 11 during charging and discharging and the power of the preset port 30 during charging and discharging. Among them, when either the battery management system BMS12 or the power management module 40 identifies that the energy storage device 100 has a fault, it is determined that the energy storage device 100 has a fault. By setting the logic of fault identification in both the battery management system BMS12 and the power management module 40, when either the battery management system BMS12 or the power management module 40 fails, the other can still identify whether the energy storage device 100 has a fault, thereby improving the stability of fault identification.

[0043] In other embodiments, whether the energy storage device 100 is faulty can also be identified through the connection status between the battery management system BMS12 and the power management module 40. For example, when data interaction between the battery management system BMS12 and the power management module 40 cannot be performed normally, it is determined that the energy storage device 100 is faulty.

[0044] Data interaction is achieved by connecting the battery management system BMS12 in the energy storage device 100 with the power management module 40, and the battery management system BMS12 obtains the power of the battery cell group 11 during charging and discharging, and the power management module 40 obtains the power of the preset port 30 during charging and discharging, so that the battery management system BMS12 and / or the power management module 40 can determine whether the energy storage device 100 has a fault based on the power of the battery cell group 11 during charging and discharging and the power of the preset port 30 during charging and discharging, and can timely identify faults inside the energy storage device 100 that do not exceed the overload protection point, thereby improving the safety of the energy storage device 100 and extending the service life of the energy storage device 100.

[0045] It should be understood that the above description is only an illustrative example of the structure of the energy storage device 100 in the embodiment of the present application. In some other embodiments, the energy storage device 100 may have more or fewer components, or some components may be replaced. For example, in other embodiments, the battery management system BMS12 and the power management module 40 may be implemented by the same controller. The embodiment of the present application does not limit the specific structure of the energy storage device 100.

[0046] The present application will describe the technical solution of the present application in detail through specific embodiments below. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0047] Figure 4 is a flow chart of a fault identification method provided in an embodiment of the present application, and the fault identification method can be applied to energy storage devices. Figure 4 As shown, the fault identification method may include the following steps. According to different requirements, the order of the steps in the flowchart may be changed, and some may be omitted.

[0048] S11, obtaining a first power of the battery module and a second power of a preset port.

[0049] In at least one embodiment of the present application, the first power of the battery module may refer to the power of the battery cell group in the battery module during charging and discharging, and the second power of the preset port may refer to the power of the preset port during charging and discharging. The first power of the battery module may be monitored by the analog front-end chip AFE in the battery module, and the second power of the preset port may be monitored by the power management module.

[0050] In at least one embodiment of the present application, the first power can be obtained by sampling the voltage, current, power and other parameters of the battery cell group during charging and discharging through the analog front-end chip AFE, and then performing relevant processing on the sampled parameters. For example, the analog front-end chip AFE samples the voltage and current of the battery cell group during charging and discharging, and then determines the first power of the battery cell group based on the voltage and current; for another example, in other embodiments, the first power can also be obtained by directly measuring the analog front-end chip AFE, or by other means, which is not limited here.

[0051] The method for obtaining the second power may refer to the method for obtaining the first power, and will not be described in detail here.

[0052] S12: Determine a power difference value according to the first power and the second power.

[0053] In at least one embodiment of the present application, during the charging and discharging process of the energy storage device, due to certain power loss, for example, power loss caused by impedance in the charging and discharging switch circuit and the power conversion circuit, there may be a certain difference between the first power and the second power of the energy storage device during charging and discharging, but the difference is very small. Therefore, when the difference between the first power and the second power is too large, it indicates that there may be a fault inside the energy storage device.

[0054] The power difference value is used to identify the difference between the first power and the second power of the energy storage device during the charging and discharging process. The higher the difference between the first power and the second power, the higher the probability that the energy storage device has a fault; the lower the difference between the first power and the second power, the lower the probability that the energy storage device has a fault.

[0055] S13: When the power difference value meets a preset deviation condition, it is determined that a fault exists in the energy storage device.

[0056] In at least one embodiment of the present application, the preset deviation condition refers to a pre-set condition for evaluating whether the energy storage device is faulty. When the power difference value satisfies the preset deviation condition, it is determined that the energy storage device is faulty; when the power difference value does not satisfy the preset deviation condition, it is determined that the energy storage device is not faulty.

[0057] Through the above method, the steps of obtaining the first power of the battery module and the second power of the preset port and determining the power difference value according to the first power and the second power can be periodically performed to continuously monitor whether the energy storage device fails.

[0058] In the fault identification method provided in the present application, whether the energy storage device has a fault is determined based on the power difference value between the first power of the battery module and the second power of the preset port, and faults inside the energy storage device that do not exceed the overload protection point can be identified in a timely manner, thereby improving the safety of the energy storage device and extending the service life of the energy storage device.

[0059] In at least one embodiment of the present application, when the energy storage device is in a discharging state, the energy storage device is connected to the load device through a preset port, and the battery cell group outputs current to the power conversion circuit through the charge and discharge switch circuit, and after being processed by the power conversion circuit, the current is output to the load device through the preset port. In this scenario, the first power includes the first output power when the battery cell group is discharged, and the second power includes the second output power when the preset port is discharged. The number of preset ports can be one or more. Figure 5 1 is a flow chart of a method for determining a power difference value under a discharge state provided in an embodiment of the present application. The method for determining a power difference value under a discharge state is applied to an energy storage device. Figure 5 As shown, the following steps are included:

[0060] S21, calculating the sum of the second output powers corresponding to the preset ports to obtain the output power sum.

[0061] In at least one embodiment of the present application, when there are multiple preset ports, the second output power corresponding to each preset port is obtained, and the sum of the multiple second output powers is calculated to obtain the output power sum.

[0062] For example, when the preset ports include a Type C port, a Type A port, a USB port, an AC port, and a DC port, the second output power corresponding to each port is obtained respectively, that is, an output power 1 corresponding to the Type C port, an output power 2 corresponding to the Type A port, an output power 3 corresponding to the USB port, an output power 4 corresponding to the AC port, and an output power 5 corresponding to the DC port. Then, the sum of the output power 1, the output power 2, the output power 3, the output power 4, and the output power 5 is calculated to obtain the output power sum.

[0063] S22: Determine a power difference value according to the first output power and the output power sum.

[0064] In at least one embodiment of the present application, during the discharge process of the energy storage device, due to the existence of discharge loss, for example, power loss caused by impedance in the charge and discharge switch circuit and the power conversion circuit, there may be a difference between the first output power of the energy storage device during discharge and the sum of the second output powers corresponding to each preset port (that is, the sum of the output powers). However, when the difference between the first output power and the sum of the output powers is too large, it indicates that there is an internal fault in the energy storage device.

[0065] The power difference value is used to identify the difference between the first output power and the output power sum during the discharge process of the energy storage device. The higher the difference between the first output power and the output power sum, the higher the probability that the energy storage device has a fault; the lower the difference between the first output power and the output power sum, the lower the probability that the energy storage device has a fault.

[0066] The embodiment of the present application calculates the sum of the second output powers corresponding to each preset port of the energy storage device in the discharge state to obtain the output power sum, and determines the power difference value according to the first output power and the output power sum, so as to determine whether the energy storage device has a fault in the discharge state, improve the safety of the energy storage device in the discharge state, and extend the service life of the energy storage device.

[0067] In at least one embodiment of the present application, when the energy storage device is in a charging state, the energy storage device is connected to an input source through a preset port, and the current provided by the input source is transmitted to the power conversion circuit through the preset port. After being processed by the power conversion circuit, the current is transmitted to the battery cell group through the charge and discharge switch circuit. In this scenario, the first power includes the first input power when the battery cell group is charged, and the second power includes the second input power when the preset port is charged. The number of preset ports can be one or more. Figure 6 1 is a flow chart of a method for determining a power difference value under a charging state provided by an embodiment of the present application. The method for determining a power difference value under a charging state is applied to an energy storage device. Figure 6 As shown, the following steps are included:

[0068] S31, calculating the sum of the second input powers corresponding to the preset ports to obtain the input power sum.

[0069] In at least one embodiment of the present application, when there are multiple preset ports, the second input power corresponding to each preset port is obtained, and the sum of the multiple second input powers is calculated to obtain the input power sum.

[0070] Exemplarily, when the preset ports include a Type C port, a Type A port, a USB port, an AC port, and a DC port, the second input power corresponding to each port is obtained respectively, that is, input power A corresponding to the Type C port, input power B corresponding to the Type A port, input power C corresponding to the USB port, input power D corresponding to the AC port, and input power E corresponding to the DC port. Then, the sum of input power A, input power B, input power C, input power D, and input power E is calculated to obtain the input power sum.

[0071] S32: Determine a power difference value according to the first input power and the input power sum.

[0072] In at least one embodiment of the present application, during the charging process of the energy storage device, due to power loss, for example, power loss caused by impedance in the charge-discharge switch circuit and the power conversion circuit, there may be a difference between the first input power of the energy storage device during charging and the sum of the second input powers corresponding to each preset port (i.e., the sum of input powers). However, when the difference between the first input power and the sum of input powers is too large, it indicates that there is an internal fault in the energy storage device.

[0073] The power difference value is used to identify the difference between the first input power and the input power sum during the charging process of the energy storage device. The higher the difference between the first input power and the input power sum, the higher the probability that the energy storage device has a fault; the lower the difference between the first input power and the input power sum, the lower the probability that the energy storage device has a fault.

[0074] The embodiment of the present application calculates the sum of the second input powers corresponding to each preset port of the energy storage device in the charging state to obtain the input power sum, and determines the power difference value according to the first input power and the input power sum, so as to determine whether the energy storage device has a fault in the charging state, improve the safety of the energy storage device in the charging state, and extend the service life of the energy storage device.

[0075] In at least one embodiment of the present application, the power difference value may be obtained by calculating the absolute value of the difference between the first power and the second power.

[0076] Correspondingly, when the power difference value meets the preset deviation condition, it is determined that the energy storage device has a fault, including: when the power difference value is greater than the preset difference threshold, it is determined that the energy storage device has a fault; when the power difference value is less than or equal to the preset difference threshold, it is determined that the energy storage device has no fault.

[0077] The preset difference threshold can be set according to actual needs, for example, the preset difference threshold can be 10W, 15W, 20W, etc. For example, taking the energy storage device in the discharge state as an example, the first output power of the battery module is 100W, and the sum of the output powers of the preset ports is 95W. In this way, the power difference value of the energy storage device during the discharge process is 5W. At this time, assuming that the preset difference threshold is set to 10W, and the power difference value is less than the preset difference threshold, it can be determined that the energy storage device is not faulty.

[0078] In addition, when the number of the preset port is one, calculating the difference between the first power and the second power can be understood as calculating the difference between the power of the battery module and the power of the preset port.

[0079] When there are multiple preset ports, calculating the difference between the first power and the second power can be understood as calculating the difference between the power of the battery module and the sum of the powers of the multiple preset ports.

[0080] In at least one embodiment of the present application, the power difference value can be obtained by calculating the ratio of the second power to the first power. Accordingly, when the power difference value meets the preset deviation condition, it is determined that the energy storage device has a fault, including: when the power difference value is not in the preset difference interval, it is determined that the energy storage device has a fault; when the power difference value is in the preset difference interval, it is determined that the energy storage device has no fault.

[0081] The preset difference interval can be set according to actual needs, for example, the preset difference interval can be 90% to 99%. For example, taking the energy storage device in the discharge state as an example, assuming that the first output power of the battery module is 100W, and the output power of the preset port is 95W, the power difference value of the energy storage device during the discharge process is 95%, and the power difference value is within the preset difference interval, it can be determined that the energy storage device is not faulty.

[0082] In addition, when the number of the preset port is one, calculating the ratio of the second power to the first power can be understood as calculating the ratio of the power of the battery module to the power of the preset port.

[0083] When there are multiple preset ports, calculating the ratio of the second power to the first power can be understood as calculating the ratio of the power of the battery module to the sum of the powers of the multiple preset ports.

[0084] In at least one embodiment of the present application, the energy storage device includes a battery cell group, a charge and discharge switch circuit, a power conversion circuit and a preset port, wherein the battery cell group provides output power to the preset port or receives input power from the preset port through the charge and discharge switch circuit and the power conversion circuit to realize the discharge and charging process.

[0085] In one embodiment, after determining that the energy storage device has a fault, the method provided in the present application may further include: controlling the power conversion circuit to stop working; and / or disconnecting the charge and discharge switch circuit.

[0086] After determining that the energy storage device has a fault, the embodiment of the present application can stop the charging and discharging of the energy storage device in time by controlling the power conversion circuit to stop working and / or disconnecting the charge and discharge switch circuit, thereby preventing the energy storage device from operating in a faulty state, improving the safety of the energy storage device, and extending the service life of the energy storage device.

[0087] In at least one embodiment of the present application, controlling the power conversion circuit to stop working includes: stopping outputting a driving signal to the power conversion circuit, or shutting down the power conversion circuit.

[0088] In one embodiment, after stopping outputting a driving signal to the power conversion circuit, the controllable switch tube in the power conversion circuit stops working, making the power conversion circuit unable to work, thereby stopping the charging and discharging behavior of the energy storage device. When stopping outputting a driving signal to the power conversion circuit, the control loop corresponding to the power conversion circuit, such as a current loop, a voltage loop, etc., still works normally, calculates the control parameters of the driving signal, but does not generate the driving signal according to the control parameters. By stopping outputting a driving signal to the power conversion circuit, when restoring the charging and discharging behavior of the energy storage device, there is no need to restart the corresponding control loop, and the driving signal can be directly generated according to the control parameters currently calculated by the control loop, driving the power conversion circuit to work normally, thereby improving the efficiency of restoring the charging and discharging behavior of the energy storage device.

[0089] In another embodiment, the charging and discharging behavior of the energy storage device can be stopped by shutting down the power conversion circuit. The above-mentioned shutting down of the power conversion circuit can be understood as stopping the control of the power conversion circuit, that is, stopping the operation of the corresponding control loop. Subsequently, when starting the power conversion circuit, it is necessary to restart the corresponding control loop to gradually restore the control of the power conversion circuit.

[0090] In at least one embodiment of the present application, after it is determined that the energy storage device has a fault, when any preset event is triggered, it is determined that the fault of the energy storage device is cleared.

[0091] The preset events may include one or more of the following events:

[0092] 1. The preset reset button on the energy storage device is triggered. For example, after the energy storage device determines that there is a fault, the user can press a physical button or a virtual button on the energy storage device (i.e., the preset reset button mentioned above). At this time, the energy storage device can respond to the user's operation and clear the fault of the energy storage device.

[0093] 2. When it is determined that the energy storage device has a fault, the timing starts, and the timing duration reaches the preset duration. The preset duration can be set according to actual needs, for example, the preset duration can be 1 hour, 2 hours, 3 hours, etc.

[0094] After the timing reaches the preset time, the energy storage device can assume that the fault has been repaired and automatically clear the fault so that the energy storage device can resume normal operation. However, during the subsequent work process, if the fault still exists, the energy storage device can still detect the fault and stop working.

[0095] 3. Receiving a preset reset instruction. For example, the energy storage device is connected to an electronic device, and after receiving the preset reset instruction from the electronic device, the energy storage device determines that the fault of the energy storage device is cleared.

[0096] 4. No devices are connected to any of the preset ports. For example, when the energy storage device is neither connected to an input source nor to a load device, it is determined that the fault of the energy storage device is cleared.

[0097] When no device is connected to any of the preset ports, the energy storage device can automatically clear the fault so that it can work normally when a new device is subsequently connected.

[0098] It should be understood that the above event content is only an illustrative example of a preset event. In other embodiments, the energy storage device may also trigger a fault clearing due to other preset events. The specific content of the preset event in the embodiment of the present application is not limited.

[0099] See also Figure 7 , Figure 74 is a schematic diagram of the structure of the fault identification device provided in the embodiment of the present application. In some embodiments, the fault identification device 400 may include a plurality of functional modules composed of computer program segments. The computer program of each program segment in the fault identification device 400 may be stored in the memory of the energy storage device and executed by at least one processor to execute (see Figure 4 Description)Fault identification function.

[0100] In this embodiment, the fault identification device 400 can be divided into multiple functional modules according to the functions it performs. The functional modules may include: a power acquisition module 401, a difference value determination module 402, and a fault identification module 403. The module referred to in this application refers to a series of computer program segments that can be executed by at least one processor and can complete fixed functions, which are stored in a memory. In this embodiment, the functions of each module will be described in detail in subsequent embodiments.

[0101] The power acquisition module 401 may be used to acquire a first power of the battery module and a second power of a preset port.

[0102] The difference value determining module 402 may be configured to determine a power difference value according to the first power and the second power.

[0103] The fault identification module 403 may be used to determine that a fault exists in the energy storage device when the power difference value satisfies a preset deviation condition.

[0104] It can be understood that the fault identification device 400 and the fault identification method of the above embodiment belong to the same inventive concept, and the specific implementation method of each module of the fault identification device 400 corresponds to the steps of the fault identification method in the above embodiment, which will not be repeated in this application.

[0105] The module division described above is a logical function division, and there may be other division methods in actual implementation. In addition, the functional modules in each embodiment of the present application may be integrated in the same processing unit, or each module may exist physically separately, or two or more modules may be integrated in the same unit. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0106] Figure 8 Schematic diagram of the structure of the energy storage device provided in the embodiment of the present application. Figure 8As shown, the energy storage device 100 also includes a memory 50, at least one processor 60, and at least one communication bus 70. The at least one processor 60 is used to execute the fault identification method implemented when the computer program stored in the memory 50 is executed, and the at least one communication bus 70 is configured to realize the connection and communication between the memory 50 and the at least one processor 60. In other embodiments of the present application, the memory 50, the at least one processor 60, and the at least one communication bus 70 may also be of the battery management system BMS12, and / or the memory 50, the at least one processor 60, and the at least one communication bus 70 may also be of the power management module 40, which is not limited here.

[0107] Those skilled in the art should understand that Figure 8 The structure of the energy storage device shown does not constitute a limitation of the embodiments of the present application. The energy storage device 100 may also include more or less other hardware or software than shown in the figure, or a different arrangement of components.

[0108] In some embodiments, the energy storage device 100 is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application-specific integrated circuits, programmable gate arrays, digital processors, and embedded devices. The energy storage device 100 can also be connected to a client device, which includes but is not limited to any electronic product that can interact with the client through a keyboard, mouse, remote control, touchpad, or voice-controlled device, such as a personal computer, tablet computer, smart phone, digital camera, etc.

[0109] It should be noted that the energy storage device 100 is only an example, and other existing or future electronic products that are suitable for the present application should also be included in the protection scope of the present application and included here by reference.

[0110] Although not shown, the power supply connected to the energy storage device 100 may include any components such as one or more DC or AC power supplies, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, etc. The energy storage device 30 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be described in detail here.

[0111] In some embodiments, a computer program is stored in the memory 50, and when the computer program is executed by at least one processor 60, all or part of the steps in the fault identification method are implemented. The memory 50 includes a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0112] Furthermore, the computer-readable storage medium may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function, etc.; the data storage area may store data created according to the use of the energy storage device 100, etc.

[0113] In some embodiments, at least one processor 60 is the control core (Control Unit) of the energy storage device 100, and uses various interfaces and lines to connect various components of the entire energy storage device 100, and executes various functions and processes data of the energy storage device 100 by running or executing programs or modules stored in the memory 50, and calling data stored in the memory 50. For example, when at least one processor 60 executes a computer program stored in the memory, it implements all or part of the steps of the fault identification method in the embodiment of the present application; or implements all or part of the functions of the fault identification device. At least one processor 60 can be composed of an integrated circuit, for example, it can be composed of a single packaged integrated circuit, or it can be composed of multiple integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and a combination of various control chips.

[0114] The above-mentioned integrated unit implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium, including a number of instructions for enabling an energy storage device (which can be a personal computer, energy storage device, or network device, etc.) or a processor to execute parts of the methods of various embodiments of the present application.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there may be other division methods in actual implementation.

[0116] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] In addition, each functional module in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0118] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "including" does not exclude other units or, and the singular does not exclude the plural. Multiple units or devices stated in the specification can also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A fault identification method, applied to energy storage equipment, characterized in that: The energy storage device includes a battery module and one or more preset ports, and the battery module is used to provide output power to the preset port or receive input power from the preset port; the method includes: Acquire a first power of the battery module and a second power of the preset port; determining a power difference value according to the first power and the second power; When the power difference value satisfies a preset deviation condition, it is determined that a fault exists in the energy storage device.

2. The fault identification method according to claim 1, characterized in that: When the energy storage device is in a discharging state, the first power includes a first output power, and the second power includes a second output power; The determining a power difference value according to the first power and the second power includes: Calculating the sum of the second output powers corresponding to the preset ports to obtain a sum of output powers; The power difference value is determined according to the first output power and the output power sum.

3. The fault identification method according to claim 1, characterized in that: When the energy storage device is in a charging state, the first power includes a first input power, and the second power includes a second input power; The determining a power difference value according to the first power and the second power includes: Calculating the sum of the second input powers corresponding to the preset ports to obtain a sum of input powers; The power difference value is determined according to the first input power and the input power sum.

4. The fault identification method according to claim 1, characterized in that: Determining a power difference value according to the first power and the second power includes: Calculating an absolute value of a difference between the first power and the second power to obtain the power difference value; Correspondingly, when the power difference value satisfies a preset deviation condition, determining that the energy storage device has a fault includes: When the power difference value is greater than a preset difference threshold, it is determined that a fault exists in the energy storage device.

5. The fault identification method according to claim 1, characterized in that: Determining a power difference value according to the first power and the second power includes: Calculating a ratio of the second power to the first power to obtain the power difference value; Correspondingly, when the power difference value satisfies a preset deviation condition, determining that the energy storage device has a fault includes: When the power difference value is not within the preset difference interval, it is determined that a fault exists in the energy storage device.

6. The fault identification method according to claim 1, characterized in that: The energy storage device further includes a power conversion circuit, and the battery module is connected to the preset port via the power conversion circuit; After determining that the energy storage device has a fault, the method further includes: The power conversion circuit is controlled to stop working.

7. The fault identification method according to claim 6, characterized in that: The controlling the power conversion circuit to stop working comprises: Stop outputting a driving signal to the power conversion circuit, or shut down the power conversion circuit.

8. The fault identification method according to claim 1, characterized in that: The battery module includes a charge and discharge switch circuit. After determining that the energy storage device has a fault, the method further includes: Disconnect the charge and discharge switch circuit.

9. The fault identification method according to claim 1, characterized in that: After determining that the energy storage device has a fault, the method further includes: When any preset event is triggered, determining that the fault of the energy storage device is cleared; The preset events include one or more of the following events: A preset reset button on the energy storage device is triggered; When it is determined that the energy storage device has a fault, the timing starts, and the timing duration reaches a preset duration; Receiving a preset reset instruction; All the preset ports have no access devices.

10. An energy storage device, characterized in that: The energy storage device includes a battery module, one or more preset ports, one or more processors and a memory, and the one or more processors are used to implement the fault identification method as described in any one of claims 1 to 9 when executing a computer program stored in the memory.

Images