Energy storage battery internal short circuit fault diagnosis method, device, system and storage medium

Abstract

The application discloses a kind of energy storage battery internal short circuit fault diagnosis method, device, system and storage medium, the method comprises: obtaining the first electrical characteristic of energy storage battery, whether the suspected internal short circuit fault of energy storage battery appears according to the first electrical characteristic prediction;The current heat generation of energy storage battery and internal material temperature value set are calculated, and according to the current heat generation and the internal material temperature value set, the heat accumulation position of energy storage battery is determined;According to the suspected internal short circuit fault and the heat accumulation position, whether the internal short circuit fault of energy storage battery appears is determined.The present application determines the suspected internal short circuit fault according to current electrical characteristic, determines the heat accumulation position of energy storage battery according to current heat generation and internal material temperature value set, and then determines whether the internal short circuit fault of energy storage battery appears according to suspected internal short circuit fault and heat accumulation position, to improve the accuracy of energy storage battery internal short circuit fault diagnosis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage technology, and particularly relates to an internal short circuit fault diagnosis method, device, system and storage medium of an energy storage battery. BACKGROUND

[0002] In the face of the development of renewable energy application scale, power service diversification and power grid structure complexity, energy storage batteries play an increasingly important role as a key link for providing peak regulation, frequency regulation, backup, black start and improving the consumption level of renewable energy such as wind and light. In the service process of the energy storage battery, potential hidden dangers of the long-term running energy storage battery may cause safety problems of the power system. The existing internal short circuit fault diagnosis method of the energy storage battery mainly judges whether the battery has an internal short circuit fault based on the change characteristics of the electrical characteristics of the battery, such as voltage, internal resistance, SOC and the like. However, the existing diagnosis method is difficult to decouple the internal short circuit fault of the energy storage battery from other faults, and cannot accurately diagnose whether the energy storage battery has an internal short circuit fault, resulting in low accuracy of the internal short circuit fault diagnosis of the energy storage battery. Therefore, how to improve the accuracy of the internal short circuit fault diagnosis of the energy storage battery is a problem to be solved. SUMMARY

[0003] The main purpose of the present application is to provide an internal short circuit fault diagnosis method, device, system and storage medium of an energy storage battery, which aims to solve the problem of how to improve the accuracy of the internal short circuit fault diagnosis of the energy storage battery.

[0004] To achieve the above-mentioned purpose, the present application provides an internal short circuit fault diagnosis method of an energy storage battery, which comprises the following steps:

[0005] obtaining a first electrical characteristic of the energy storage battery, and predicting whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic;

[0006] calculating a current heat generation amount and an internal material temperature value set of the energy storage battery, and determining a heat accumulation position of the energy storage battery according to the current heat generation amount and the internal material temperature value set;

[0007] determining whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position.

[0008] Optionally, the step of obtaining a first electrical characteristic of the energy storage battery and predicting whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic comprises:

[0009] obtaining a first electrical characteristic of the energy storage battery, comparing the first electrical characteristic with a preset electrical characteristic, and obtaining a comparison result;

[0010] If the comparison result meets the preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault;

[0011] If the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault.

[0012] Optionally, the step of calculating the current heat generation of the energy storage battery and the internal material temperature value set comprises:

[0013] obtaining a surface temperature value set and a second electrical characteristic of the energy storage battery, and calculating the current heat generation of the energy storage battery according to the surface temperature value set, the second electrical characteristic and a pre-created heat generation model;

[0014] obtaining a material parameter of the energy storage battery, and calculating an internal material temperature value set of the energy storage battery according to the surface temperature value set, the material parameter and the pre-created heat transfer model.

[0015] Optionally, the second electrical characteristic comprises a charge-discharge current, an end voltage and a current state of charge.

[0016] Optionally, the step of calculating the current heat generation of the energy storage battery according to the surface temperature value set, the second electrical characteristic and a pre-created heat generation model comprises:

[0017] determining an open circuit voltage of the energy storage battery according to the current state of charge;

[0018] calculating a current heat generation set of the energy storage battery according to the charge-discharge current, the end voltage, the open circuit voltage, the surface temperature value set and a pre-created heat generation model;

[0019] comparing all current heat generations in the current heat generation set, determining a current maximum heat generation in the current heat generation set, and taking the current maximum heat generation as the current heat generation of the energy storage battery.

[0020] Optionally, the step of determining the heat accumulation position of the energy storage battery according to the current heat generation and the internal material temperature value set comprises:

[0021] calculating an internal heat generation surface set of the energy storage battery according to the current heat generation and the internal material temperature value set;

[0022] determining the intersection of all internal heat generation surfaces in the internal heat generation surface set, and determining the heat accumulation position of the energy storage battery according to the intersection.

[0023] Optionally, the step of determining whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position comprises:

[0024] If it is determined that the energy storage battery has the suspected internal short circuit fault, the heat accumulation position is compared with a pre-constructed internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position;

[0025] It is determined whether the component position is an internal short circuit fault component position;

[0026] If the component position is the internal short circuit fault component position, it is determined that the energy storage battery has an internal short circuit fault;

[0027] If the component position is not the internal short circuit fault component position, it is determined that the energy storage battery does not have an internal short circuit fault.

[0028] Optionally, the internal short circuit fault component position comprises a positive electrode, a negative electrode, or a separator.

[0029] Optionally, the step of comparing the heat accumulation position with the pre-constructed internal structure model of the energy storage battery to determine the component position corresponding to the heat accumulation position comprises:

[0030] A first coordinate corresponding to the heat accumulation position in the internal structure model of the energy storage battery is determined;

[0031] Second coordinates corresponding to all component positions in the internal structure model of the energy storage battery are respectively acquired, and a component position corresponding to the heat accumulation position is determined according to the first coordinate and the second coordinates.

[0032] Optionally, after the step of determining that the energy storage battery has an internal short circuit fault if the component position is the preset internal short circuit fault component position, the method further comprises:

[0033] A fault mechanism is determined according to the component position, and an alarm message is issued according to the component position and the fault mechanism;

[0034] An internal short circuit fault repair scheme is generated according to the fault position and the fault mechanism.

[0035] In addition, to achieve the above object, the application further provides an internal short circuit fault diagnosis device of an energy storage battery, which comprises:

[0036] A prediction module is configured to acquire a first electrical characteristic of an energy storage battery, and predict whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic;

[0037] a calculation module, configured to calculate a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determine a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values;

[0038] a determination module, configured to determine whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position.

[0039] Further, the prediction module is further configured to:

[0040] obtain a first electrical characteristic of the energy storage battery, compare the first electrical characteristic with a preset electrical characteristic, and obtain a comparison result;

[0041] if the comparison result meets a preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault;

[0042] if the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault.

[0043] Further, the determination module is further configured to:

[0044] obtain a set of surface temperature values and a second electrical characteristic of the energy storage battery, and calculate a current heat generation amount of the energy storage battery according to the set of surface temperature values, the second electrical characteristic and a pre-created heat generation model;

[0045] obtain a material parameter of the energy storage battery, and calculate a set of internal material temperature values of the energy storage battery according to the set of surface temperature values, the material parameter and the pre-created heat transfer model.

[0046] Further, the determination module is further configured to:

[0047] determine an open circuit voltage of the energy storage battery according to the current state of charge;

[0048] calculate a set of current heat generation amounts of the energy storage battery according to the charging and discharging current, the terminal voltage, the open circuit voltage, the set of surface temperature values and a pre-created heat generation model;

[0049] compare all current heat generation amounts in the set of current heat generation amounts, determine a current maximum heat generation amount in the set of current heat generation amounts, and take the current maximum heat generation amount as the current heat generation amount of the energy storage battery.

[0050] Further, the determination module is further configured to:

[0051] calculate a set of internal heat generation surfaces of the energy storage battery according to the current heat generation amount and the set of internal material temperature values;

[0052] determine an intersection of all the internal heat generating surfaces in the set of internal heat generating surfaces, and determine a heat accumulation position of the energy storage battery according to the intersection.

[0053] Further, the determining module is further configured to:

[0054] If it is determined that the energy storage battery has the suspected internal short circuit fault, compare the heat accumulation position with a pre-constructed internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position;

[0055] determine whether the component position is an internal short circuit fault component position;

[0056] If the component position is the internal short circuit fault component position, determine that the energy storage battery has an internal short circuit fault;

[0057] If the component position is not the internal short circuit fault component position, determine that the energy storage battery does not have an internal short circuit fault.

[0058] Further, the determining module is further configured to:

[0059] determine a first coordinate corresponding to the heat accumulation position in the internal structure model of the energy storage battery;

[0060] respectively acquire a second coordinate corresponding to all the component positions in the internal structure model of the energy storage battery, and determine the component position corresponding to the heat accumulation position according to the first coordinate and the second coordinate.

[0061] Further, the determining module further comprises an alarm module, and the alarm module is configured to:

[0062] determine a fault mechanism according to the component position, and issue an alarm information according to the component position and the fault mechanism;

[0063] generate an internal short circuit fault repair scheme according to the fault position and the fault mechanism.

[0064] In addition, to achieve the above object, the present application further provides an internal short circuit fault diagnosis system of an energy storage battery, which comprises a memory, a processor and an internal short circuit fault diagnosis program of an energy storage battery stored in the memory and capable of running on the processor, and the internal short circuit fault diagnosis program of the energy storage battery realizes the steps of the internal short circuit fault diagnosis method of the energy storage battery when executed by the processor.

[0065] In addition, to achieve the above object, the application further provides a storage medium, wherein the storage medium stores an internal short circuit fault diagnosis program of an energy storage battery, and the internal short circuit fault diagnosis program of the energy storage battery realizes the steps of the internal short circuit fault diagnosis method of the energy storage battery when executed by a processor.

[0066] The internal short circuit fault diagnosis method of the energy storage battery provided by the application comprises the following steps: obtaining a first electrical characteristic of the energy storage battery; predicting whether a suspected internal short circuit fault of the energy storage battery occurs according to the first electrical characteristic; calculating a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determining a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values; and determining whether an internal short circuit fault of the energy storage battery occurs according to the suspected internal short circuit fault and the heat accumulation position. The application determines the suspected internal short circuit fault according to the current electrical characteristic, determines the heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values, and then determines whether the internal short circuit fault of the energy storage battery occurs according to the suspected internal short circuit fault and the heat accumulation position, thereby improving the accuracy of the internal short circuit fault diagnosis of the energy storage battery. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 is a device structure schematic diagram of a hardware running environment related to an embodiment scheme of the application.

[0068] Figure 2 is a flowchart of a first embodiment of the internal short circuit fault diagnosis method of the energy storage battery of the application.

[0069] Figure 3 is a schematic diagram of an internal heating surface set and a heat accumulation position of the energy storage battery of the application.

[0070] Figure 4 is a flowchart of a second embodiment of the internal short circuit fault diagnosis method of the energy storage battery of the application.

[0071] Figure 5 is a structure schematic diagram of an internal short circuit fault diagnosis device of the energy storage battery of the application.

[0072] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0073] It should be understood that the specific embodiments described herein are merely intended to explain the application and not to limit the application.

[0074] As shown in Figure 1 , the application relates to an internal short circuit fault diagnosis method of an energy storage battery. Figure 1 is a device structure schematic diagram of a hardware running environment related to an embodiment scheme of the application.

[0075] The device of the embodiment of the present application can be a PC or a server device.

[0076] As shown in Figure 1 , the device can include a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. The communication bus 1002 is used to realize the connection communication between the components. The user interface 1003 can include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a WI-FI interface). The memory 1005 can be a high-speed RAM memory, or a stable memory (non-volatile memory) such as a disk memory. The memory 1005 can also be an optional storage device independent of the aforementioned processor 1001.

[0077] Those skilled in the art can understand that Figure 1 the device structure shown in the above description does not constitute a limitation on the device, and can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0078] As shown in Figure 1 , the memory 1005 as a computer storage medium can include an operating system, a network communication module, a user interface module, and an internal short circuit fault diagnosis program of the energy storage battery.

[0079] The operating system is a program that manages and controls the portable storage device and software resources, supports the operation of the network communication module, the user interface module, the internal short circuit fault diagnosis program of the energy storage battery, and other programs or software; the network communication module is used to manage and control the network interface 1002; the user interface module is used to manage and control the user interface 1003.

[0080] In Figure 1 the storage device, the storage device calls the internal short circuit fault diagnosis program of the energy storage battery stored in the memory 1005 through the processor 1001, and performs the operations in each embodiment of the internal short circuit fault diagnosis method of the energy storage battery.

[0081] Based on the above hardware structure, embodiments of the internal short circuit fault diagnosis method of the energy storage battery are proposed.

[0082] Referring to Figure 2 , Figure 2 , the flowchart of the first embodiment of the internal short circuit fault diagnosis method of the energy storage battery of the present application is shown. The method comprises:

[0083] Step S10, obtaining a first electrical characteristic of the energy storage battery, and predicting whether a suspected internal short circuit fault of the energy storage battery occurs according to the first electrical characteristic;

[0084] Step S20, calculating a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determining a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values;

[0085] Step S30, determining whether an internal short circuit fault of the energy storage battery occurs according to the suspected internal short circuit fault and the heat accumulation position.

[0086] The internal short circuit fault diagnosis method of the energy storage battery in the embodiment is applied to an internal short circuit fault diagnosis system of the energy storage battery, and the internal short circuit fault diagnosis system of the energy storage battery can be applied to intelligent devices such as terminal devices and pc terminals. For the convenience of description, the internal short circuit fault diagnosis system of the energy storage battery is referred to as an internal short circuit fault diagnosis system, and the internal short circuit fault diagnosis system is taken as an example for description. In the process of working of the internal short circuit fault diagnosis system of the energy storage battery, a first electrical characteristic of the energy storage battery is acquired, the first electrical characteristic is compared with a preset electrical characteristic, and a comparison result is obtained. If the comparison result meets a preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault. If the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault. The internal short circuit fault diagnosis system acquires a surface temperature value set and a second electrical characteristic of the energy storage battery, and calculates a current heat generation of the energy storage battery according to the surface temperature value set, the second electrical characteristic and a pre-created heat generation model. The internal short circuit fault diagnosis system acquires material parameters of the energy storage battery, and calculates an internal material temperature value set of the energy storage battery according to the surface temperature value set, the material parameters and a pre-created heat transfer model. The internal short circuit fault diagnosis system calculates an internal heat surface set of the energy storage battery according to the current heat generation and the internal material temperature value set, determines an intersection of all internal heat surfaces in the internal heat surface set, and determines a heat accumulation position of the energy storage battery according to the intersection. If the internal short circuit fault diagnosis system determines that the energy storage battery has a suspected internal short circuit fault, the heat accumulation position is compared with a pre-created internal structure model of the energy storage battery, a component position corresponding to the heat accumulation position is determined, and whether the component position is an internal short circuit fault component position is judged. If the internal short circuit fault diagnosis system determines that the component position is the internal short circuit fault component position, it is determined that the energy storage battery has an internal short circuit fault. If the internal short circuit fault diagnosis system determines that the component position is not the internal short circuit fault component position, it is determined that the energy storage battery does not have an internal short circuit fault. It should be noted that the first electrical characteristic of the energy storage battery includes current, voltage, internal impedance, charge and discharge time length and battery capacity. The second electrical characteristic of the energy storage battery includes charge and discharge current, terminal voltage and current state of charge. The material parameters are parameters corresponding to materials for manufacturing the energy storage battery, including material thickness, material thermal conductivity, material area and the like.

[0087] The internal short circuit fault diagnosis method of the energy storage battery of the embodiment obtains a first electrical characteristic of the energy storage battery, predicts whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic, calculates a current heat generation amount and an internal material temperature value set of the energy storage battery, and determines a heat accumulation position of the energy storage battery according to the current heat generation amount and the internal material temperature value set. Whether the energy storage battery has an internal short circuit fault is determined according to the suspected internal short circuit fault and the heat accumulation position. The present application determines the suspected internal short circuit fault according to the current electrical characteristic, determines the heat accumulation position of the energy storage battery according to the current heat generation amount and the internal material temperature value set, and then determines whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position, thereby improving the accuracy of the internal short circuit fault diagnosis of the energy storage battery.

[0088] The following will be described in detail:

[0089] In step S10, a first electrical characteristic of the energy storage battery is obtained, and whether the energy storage battery has a suspected internal short circuit fault is predicted according to the first electrical characteristic.

[0090] In the embodiment, the internal short circuit fault diagnosis system collects and obtains the first electrical characteristic of the energy storage battery through the data acquisition device installed in the energy storage battery in advance, and predicts whether the energy storage battery has a suspected internal short circuit fault according to the obtained first electrical characteristic. Preferably, the internal short circuit fault diagnosis system predicts whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic. If it is determined that the energy storage battery does not have a suspected internal short circuit fault, the first electrical characteristic of the energy storage battery is re-obtained. If it is determined that the energy storage battery has a suspected internal short circuit fault, the subsequent steps are continued.

[0091] Specifically, step S10 includes:

[0092] In step S101, the first electrical characteristic of the energy storage battery is obtained, and the first electrical characteristic is compared with a preset electrical characteristic to obtain a comparison result.

[0093] In step S102, if the comparison result meets a preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault.

[0094] In step S103, if the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault.

[0095] In steps S101-S103, the first electrical characteristics of the energy storage battery include current, voltage, internal impedance, charge and discharge time length, and battery capacity, and the preset electrical characteristics include standard current, standard voltage, standard internal impedance, standard charge and discharge time length, and standard battery capacity. After the internal short circuit fault diagnosis system obtains the first electrical characteristics of the energy storage battery, the first electrical characteristics are compared with the preset electrical characteristics to determine the errors of the current and the standard current, the errors of the voltage and the standard voltage, the errors of the internal impedance and the standard internal impedance, the errors of the charge and discharge time length and the standard charge and discharge time length, and the errors of the battery capacity and the standard battery capacity, and a comparison result is obtained. If the internal short circuit fault diagnosis system determines that each item of the comparison result meets the preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault. If the internal short circuit fault diagnosis system determines that each item of the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault.

[0096] In an available embodiment, the main electrical characteristics of the energy storage battery when an internal short circuit fault occurs include that the voltage and current are continuously lower than the theoretical parameters, the internal impedance increases, the charge and discharge time length and the capacity change, etc. After the internal short circuit fault diagnosis system obtains the first electrical characteristics of the energy storage battery, the first electrical characteristics are compared with the preset electrical characteristics to determine that the current decreases and the error of the current and the standard current does not meet the preset error range, or the voltage decreases and the error of the voltage and the standard voltage does not meet the preset error range, or the internal impedance increases and the error of the internal impedance and the standard internal impedance does not meet the preset error range, or the error of the charge and discharge time length and the standard charge and discharge time length does not meet the preset error range, or the error of the battery capacity and the standard battery capacity does not meet the preset error range. The internal short circuit fault diagnosis system can predict that the energy storage battery has a suspected internal short circuit fault.

[0097] In step S20, the current heat generation and the internal material temperature value set of the energy storage battery are calculated, and the heat accumulation position of the energy storage battery is determined according to the current heat generation and the internal material temperature value set.

[0098] In this embodiment, the internal short circuit fault diagnosis system obtains the surface temperature value set by collecting the surface temperature values of the energy storage battery surface through the temperature collection device pre-installed on the surface of the energy storage battery, obtains the second electrical characteristics of the energy storage battery and the material parameters of the energy storage battery, and then calculates the current heat generation and the internal material temperature value set of the energy storage battery by combining the pre-created heat generation model and heat transfer model. At least three different surfaces of the energy storage battery are provided with temperature collection devices respectively, and the surface temperature values corresponding to the three different surfaces are collected respectively. Optionally, the number of surfaces from which the surface temperature needs to be collected can be set according to the specific situation.

[0099] Specifically, the step of calculating the current heat generation of the energy storage battery and the set of internal material temperature values comprises:

[0100] In step S201, a set of surface temperature values and a second electrical characteristic of the energy storage battery are obtained, and a current heat generation of the energy storage battery is calculated according to the set of surface temperature values, the second electrical characteristic and a pre-created heat generation model.

[0101] In this step, the internal short circuit fault diagnosis system inputs the set of surface temperature values and the second electrical characteristic into the pre-created heat generation model, and calculates the current heat generation of the energy storage battery through the heat generation model, wherein the second electrical characteristic comprises a charge-discharge current, a terminal voltage and a current state of charge, the current can be directly provided by collecting data through a current sensor, the terminal voltage can be directly provided by a voltage sensor, and the current state of charge is calculated according to an initial state of charge of the energy storage battery and a discharge current of the energy storage battery.

[0102] Further, step S201 comprises:

[0103] In step S2011, an open circuit voltage of the energy storage battery is determined according to the current state of charge.

[0104] In this step, the internal short circuit fault diagnosis system obtains the current state of charge in the second electrical characteristic, and determines the open circuit voltage of the energy storage battery according to the current state of charge. Specifically, the open circuit voltage has a strong correlation with the state of charge, that is, the open circuit voltage has a one-to-one correspondence with the state of charge, and the internal short circuit fault diagnosis system can obtain the open circuit voltage of the energy storage battery based on the current state of charge and a pre-set open circuit voltage-state of charge relationship curve.

[0105] In step S2012, a current heat generation set of the energy storage battery is calculated according to the charge-discharge current, the terminal voltage, the open circuit voltage, the set of surface temperature values and the pre-created heat generation model.

[0106] In this step, after the open circuit voltage is determined, one surface temperature value in the set of surface temperature values is selected as a target surface temperature value, and the open circuit voltage, the target surface temperature value and the charge-discharge current, the terminal voltage and the current state of charge in the electrical characteristic are input into the pre-created heat generation model, so as to calculate the current heat generation corresponding to each surface temperature value of the energy storage battery through the heat generation model, and further obtain the current heat generation set of the energy storage battery. Specifically, the heat generation model can be expressed as the following formula:

[0107]

[0108] Wherein, q represents the heat generation of the energy storage battery; I represents the charge and discharge current of the energy storage battery, I is positive when the energy storage battery is charging, I is negative when the energy storage battery is discharging, U represents the terminal voltage of the energy storage battery, OCV represents the open circuit voltage of the energy storage battery, T represents the target surface temperature value of the energy storage battery, represents the temperature coefficient. I*(U-OCV) represents the polarization heat part, that is, the sum of ohmic polarization and concentration polarization, and (U-OCV) represents the reversible reaction heat part, that is, the entropy change heat generation.

[0109] Step S2013, comparing all the current heat generations in the current heat generation set, determining the current maximum heat generation in the current heat generation set, and taking the current maximum heat generation as the current heat generation of the energy storage battery.

[0110] In this step, the internal short circuit fault diagnosis system will calculate the current heat generation corresponding to each surface temperature value of the energy storage battery, obtain the current heat generation set, compare all the current heat generations in the current heat generation set, determine the current maximum heat generation in the current heat generation set, and take the current maximum heat generation as the current heat generation of the energy storage battery.

[0111] Step S202, obtaining the material parameters of the energy storage battery, and calculating the internal material temperature value set of the energy storage battery according to the surface temperature value set, the material parameters and the pre-created heat transfer model.

[0112] In this step, the internal short circuit fault diagnosis system obtains the material parameters of the energy storage battery, and selects a surface temperature value in the surface temperature value set as a target surface temperature value in turn, inputs the target surface temperature value and the material parameters into the pre-created heat transfer model, and calculates the internal material temperature value corresponding to each surface temperature value of the energy storage battery through the heat transfer model to obtain the internal material temperature value set. Specifically, the heat transfer model can be expressed as the following formula:

[0113]

[0114] Wherein, q x is the target surface temperature value, T is the internal material temperature value, x is the material thickness, k is the material thermal conductivity, and A is the material area.

[0115] Specifically, according to the current heat generation and the internal material temperature value set, the step of determining the heat accumulation position of the energy storage battery comprises:

[0116] Step S203, calculating the internal heat generation surface set of the energy storage battery according to the current heat generation and the internal material temperature value set;

[0117] In this step, the internal short circuit fault diagnosis system inputs the current heat generation and internal material temperature value set into the pre-created simulation software, and calculates the internal heat surface set of the energy storage battery. It can be understood that the internal material temperature value set includes the internal material temperature corresponding to each surface temperature value in the surface temperature value set. Therefore, the calculated internal heat surface set of the energy storage battery includes the internal heat surface of the surface of the energy storage battery corresponding to each surface temperature value. As shown in FIG. 8, a cube represents an energy storage battery, K1, K2 and K3 represent three surfaces of the energy storage battery that need to collect surface temperature values, T1, T2 and T3 represent the surface temperature values of the three surfaces, A1 represents the internal heat surface corresponding to K1, A2 represents the internal heat surface corresponding to K2, and A3 represents the internal heat surface corresponding to K3. Figure 3

[0118] Step S204, determining the intersection of all internal heat surfaces in the internal heat surface set, and determining the heat accumulation position of the energy storage battery according to the intersection.

[0119] In this step, after determining the internal heat surface set of the energy storage battery, the internal short circuit fault diagnosis system determines the intersection of all internal heat surfaces in the internal heat surface set, and determines the heat accumulation position of the energy storage battery according to the intersection. As shown in FIG. 9, Figure 3 Figure 3 The intersection of the three internal heat surfaces A1, A2 and A3 is the heat accumulation position of the energy storage battery.

[0120] Further, if the internal short circuit fault diagnosis system obtains an internal heat surface set of the energy storage battery containing more than three internal heat surfaces in different directions, the internal short circuit fault diagnosis system will determine multiple intersections of all internal heat surfaces in the internal heat surface set, and further determine multiple heat accumulation positions of the energy storage battery.

[0121] Step S30, determining whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position.

[0122] In this embodiment, the internal short circuit fault diagnosis system determines whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position. Preferably, the internal short circuit fault diagnosis system can first determine whether the energy storage battery has a suspected internal short circuit fault, then determine the heat accumulation position of the energy storage battery, and further determine whether the energy storage battery has an internal short circuit fault. Alternatively, the internal short circuit fault diagnosis system can first determine the heat accumulation position of the energy storage battery, then determine whether the energy storage battery has a suspected internal short circuit fault, and further determine whether the energy storage battery has an internal short circuit fault. Alternatively, the internal short circuit fault diagnosis system can simultaneously determine the heat accumulation position of the energy storage battery and whether the energy storage battery has a suspected internal short circuit fault, and further determine whether the energy storage battery has an internal short circuit fault. ​​

[0123] Specifically, step S30 comprises:

[0124] Step S301, if it is determined that the energy storage battery has the suspected internal short circuit fault, comparing the heat accumulation position with a pre-constructed internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position;

[0125] Step S302, judging whether the component position is an internal short circuit fault component position;

[0126] Step S303, if the component position is the internal short circuit fault component position, determining that the energy storage battery has an internal short circuit fault;

[0127] Step S304, if the component position is not the internal short circuit fault component position, determining that the energy storage battery does not have an internal short circuit fault.

[0128] In steps S301 to S304, if the internal short circuit fault diagnosis system determines that the energy storage battery has a suspected internal short circuit fault, the internal short circuit fault diagnosis system compares the heat accumulation position with a pre-constructed internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position; the internal short circuit fault diagnosis system judges whether the component position is an internal short circuit fault component position; if the component position is the internal short circuit fault component position, the internal short circuit fault diagnosis system determines that the energy storage battery has an internal short circuit fault; if the component position is not the internal short circuit fault component position, the internal short circuit fault diagnosis system determines that the energy storage battery does not have an internal short circuit fault. It should be noted that the internal short circuit fault component position includes a positive electrode, a negative electrode, or a separator.

[0129] Further, if the internal short circuit fault diagnosis system obtains an internal heat generation surface set of the energy storage battery containing three or more internal heat generation surfaces in different directions, all internal heat generation surfaces in the internal heat generation surface set determined by the internal short circuit fault diagnosis system will have multiple intersection points, and the heat accumulation position of the energy storage battery determined by the internal short circuit fault diagnosis system will also have multiple positions, that is, the internal short circuit fault diagnosis system will determine multiple corresponding component positions in the pre-constructed internal structure model of the energy storage battery, and the internal short circuit fault diagnosis system judges whether the component position is an internal short circuit fault component position, which may determine that an internal short circuit fault occurs simultaneously in one or more of the positive electrode, the negative electrode, and the separator of the energy storage battery; or it may be determined that the energy storage battery has other faults in addition to the internal short circuit fault.

[0130] Further, step S301 comprises:

[0131] Step S3011, determining a first coordinate of the heat accumulation position in the internal structure model of the energy storage battery;

[0132] In step S3012, the second coordinates corresponding to the positions of all components in the internal structure model of the energy storage battery are respectively acquired, and the position of the component corresponding to the heat accumulation position is determined according to the first coordinates and the second coordinates.

[0133] In steps S3011 to S3012, the internal short circuit fault diagnosis system inputs the heat accumulation position into the internal structure model of the energy storage battery, and determines the first coordinates corresponding to the heat accumulation position according to the position of the heat accumulation position in the internal structure model of the energy storage battery. The internal short circuit fault diagnosis system acquires the second coordinates corresponding to the positions of all components in the internal structure model of the energy storage battery, calculates the distance between each component position and the heat accumulation position according to the second coordinates corresponding to each component position and the first coordinates corresponding to the heat accumulation position, compares the distance between each component position and the heat accumulation position, and then determines the component position with the minimum distance from the heat accumulation position as the component position corresponding to the heat accumulation position. It can be understood that, in order to ensure the electrical safety of the energy storage battery, there will be a certain gap between each component position in the internal structure of the energy storage battery, and the calculated heat accumulation position may not accurately correspond to the component position in the internal structure of the energy storage battery. Therefore, when the heat accumulation position accurately corresponds to the component position in the internal structure model of the energy storage battery, the component position is determined as the fault position of the energy storage battery, and when the heat accumulation position does not accurately correspond to the component position in the internal structure model of the energy storage battery, the component position with the minimum distance from the heat accumulation position is determined as the component position corresponding to the heat accumulation position according to the second coordinates of all component positions in the internal structure model of the energy storage battery and the first coordinates of the heat accumulation position.

[0134] The internal short circuit fault diagnosis system of the embodiment obtains a first electrical characteristic of the energy storage battery during the operation of the energy storage battery, compares the first electrical characteristic with a preset electrical characteristic, and obtains a comparison result; if the comparison result meets a preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault; if the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault; the internal short circuit fault diagnosis system obtains a surface temperature value set and a second electrical characteristic of the energy storage battery, and calculates a current heat generation of the energy storage battery according to the surface temperature value set, the second electrical characteristic, and a pre-created heat generation model; the internal short circuit fault diagnosis system obtains material parameters of the energy storage battery, and calculates an internal material temperature value set of the energy storage battery according to the surface temperature value set, the material parameters, and a pre-created heat transfer model; the internal short circuit fault diagnosis system calculates an internal heat generation surface set of the energy storage battery according to the current heat generation and the internal material temperature value set, determines an intersection of all internal heat generation surfaces in the internal heat generation surface set, and determines a heat accumulation position of the energy storage battery according to the intersection; if the internal short circuit fault diagnosis system determines that the energy storage battery has a suspected internal short circuit fault, the heat accumulation position is compared with a pre-created internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position, and it is determined whether the component position is an internal short circuit fault component position; if the internal short circuit fault diagnosis system determines that the component position is the internal short circuit fault component position, it is determined that the energy storage battery has an internal short circuit fault; if the internal short circuit fault diagnosis system determines that the component position is not the internal short circuit fault component position, it is determined that the energy storage battery does not have an internal short circuit fault. The suspected internal short circuit fault is determined according to the current electrical characteristic, the heat accumulation position of the energy storage battery is determined according to the current heat generation and the internal material temperature value set, and whether the energy storage battery has an internal short circuit fault is determined according to the suspected internal short circuit fault and the heat accumulation position, thereby improving the accuracy of the internal short circuit fault diagnosis of the energy storage battery.

[0135] Further, referring to Figure 4 , a second embodiment of the present application is proposed, which is different from the first embodiment in that, after the step of determining that the energy storage battery has an internal short circuit fault, the second embodiment comprises:

[0136] Step S40, determining a fault mechanism according to the component position, and issuing an alarm information according to the component position and the fault mechanism;

[0137] Step S50, generating an internal short circuit fault repair scheme according to the fault position and the fault mechanism.

[0138] In the embodiment, after the internal short circuit fault diagnosis system determines the position of the component corresponding to the heat accumulation position, the internal short circuit fault diagnosis system determines the fault mechanism of the energy storage battery according to the fault position, and sends an alarm message according to the position of the component and the fault mechanism; and then, according to the fault position and the fault mechanism, the internal short circuit fault repair scheme is generated, so that the management personnel can determine the internal short circuit fault and repair the internal short circuit fault according to the internal short circuit fault repair scheme. For example, taking the energy storage lithium battery as an example, after the internal short circuit fault diagnosis system determines that the energy storage battery has a suspected internal short circuit fault, and determines that the position of the component corresponding to the heat accumulation position is at the positive electrode, the negative electrode or the separator of the energy storage battery, it is determined that the energy storage battery has an internal short circuit fault, and when the position of the component is at the positive electrode of the energy storage battery, it is judged that the fault mechanism of the internal short circuit fault is non-lithium metal precipitation, when the position of the component is at the negative electrode of the energy storage battery, it is judged that the fault mechanism of the internal short circuit fault is lithium metal precipitation, and when the position of the component is at the separator of the energy storage battery, it is judged that the fault mechanism of the internal short circuit fault is separator damage; further, the fault mechanism of the sodium ion battery, the lead-acid battery, the flow battery and the like can be determined according to the specific type of the battery.

[0139] After the internal short circuit fault diagnosis system of the embodiment determines the position of the component corresponding to the heat accumulation position of the energy storage battery, the corresponding fault mechanism is determined according to whether the position of the component corresponding to the heat accumulation position is the positive electrode, the negative electrode or the separator of the energy storage battery, and an alarm and an internal short circuit fault repair scheme are sent; so that the management personnel can determine the internal short circuit fault, so that the internal short circuit fault of the energy storage battery can be determined as soon as possible, the evolution of the internal short circuit fault of the energy storage battery to the end stage is avoided, and the safety of the energy storage battery is ensured.

[0140] As shown in Figure 5 The present application also provides an internal short circuit fault diagnosis device for an energy storage battery. The internal short circuit fault diagnosis device for the energy storage battery comprises:

[0141] A prediction module 101 is configured to acquire a first electrical characteristic of an energy storage battery, and predict whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic;

[0142] A calculation module 102 is configured to calculate a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determine a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values.

[0143] A determination module 103 is configured to determine whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position.

[0144] Further, the determination module is further configured to:

[0145] acquire a surface temperature value set and a second electrical characteristic of the energy storage battery, and calculate a current heat generation of the energy storage battery according to the surface temperature value set, the second electrical characteristic and a pre-created heat generation model;

[0146] acquire a material parameter of the energy storage battery, and calculate an internal material temperature value set of the energy storage battery according to the surface temperature value set, the material parameter and the pre-created heat transfer model.

[0147] Further, the determination module is further configured to:

[0148] determine an open circuit voltage of the energy storage battery according to the current state of charge;

[0149] calculate a current heat generation set of the energy storage battery according to the charging and discharging current, the terminal voltage, the open circuit voltage, the surface temperature value set and a pre-created heat generation model;

[0150] compare all current heat generations in the current heat generation set, determine a current maximum heat generation in the current heat generation set, and take the current maximum heat generation as the current heat generation of the energy storage battery.

[0151] Further, the determination module is further configured to:

[0152] calculate an internal heat generation surface set of the energy storage battery according to the current heat generation and the internal material temperature value set;

[0153] determine an intersection of all internal heat generation surfaces in the internal heat generation surface set, and determine a heat accumulation position of the energy storage battery according to the intersection.

[0154] Further, the determination module is further configured to:

[0155] if it is determined that the energy storage battery has the suspected internal short circuit fault, compare the heat accumulation position with a pre-created internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position;

[0156] determine whether the component position is an internal short circuit fault component position;

[0157] if the component position is the internal short circuit fault component position, it is determined that the energy storage battery has an internal short circuit fault;

[0158] if the component position is not the internal short circuit fault component position, it is determined that the energy storage battery does not have an internal short circuit fault.

[0159] Further, the determination module is further configured to:

[0160] determining a first coordinate corresponding to the heat accumulation position in the internal structure model of the energy storage battery;

[0161] respectively acquiring a second coordinate corresponding to a position of each component in the internal structure model of the energy storage battery, and determining a position of a component corresponding to the heat accumulation position according to the first coordinate and the second coordinate.

[0162] Further, the determining module further comprises an alarm module, which is configured to:

[0163] determining a failure mechanism according to the position of the component, and issuing an alarm information according to the position of the component and the failure mechanism;

[0164] generating a repair scheme for internal short circuit failure according to the failure position and the failure mechanism.

[0165] The application further provides an internal short circuit failure diagnosis system for an energy storage battery.

[0166] The internal short circuit failure diagnosis system for the energy storage battery comprises a memory, a processor and an internal short circuit failure diagnosis program for the energy storage battery stored in the memory and executable on the processor, and the internal short circuit failure diagnosis program for the energy storage battery, when executed by the processor, implements the steps of the internal short circuit failure diagnosis method for the energy storage battery.

[0167] The method implemented when the internal short circuit failure diagnosis program for the energy storage battery executable on the processor is executed can refer to the embodiments of the internal short circuit failure diagnosis method for the energy storage battery, and will not be repeated here.

[0168] The application further provides a storage medium.

[0169] The storage medium stores an internal short circuit failure diagnosis program for an energy storage battery, and the internal short circuit failure diagnosis program for the energy storage battery, when executed by a processor, implements the steps of the internal short circuit failure diagnosis method for the energy storage battery.

[0170] The method implemented when the internal short circuit failure diagnosis program for the energy storage battery executable on the processor is executed can refer to the embodiments of the internal short circuit failure diagnosis method for the energy storage battery, and will not be repeated here.

[0171] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0172] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0173] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and the necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) as described above, and includes a number of instructions for making a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) execute the methods described in the various embodiments of the present application.

[0174] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A method of diagnosing an internal short circuit fault of an energy storage battery, characterized by, The internal short circuit fault diagnosis method of the energy storage battery comprises the following steps: Obtaining a first electrical characteristic of the energy storage battery, and predicting whether a suspected internal short circuit fault of the energy storage battery occurs according to the first electrical characteristic; Calculating a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determining a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values, wherein the current heat generation amount is calculated based on a set of surface temperature values of the energy storage battery, a second electrical characteristic obtained in advance, and a heat generation model created in advance; Determining whether an internal short circuit fault of the energy storage battery occurs according to the suspected internal short circuit fault and the heat accumulation position.

2. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 1, wherein The step of obtaining a first electrical characteristic of the energy storage battery and predicting whether a suspected internal short circuit fault of the energy storage battery occurs according to the first electrical characteristic comprises: Obtaining a first electrical characteristic of the energy storage battery, comparing the first electrical characteristic with a preset electrical characteristic, and obtaining a comparison result; If the comparison result meets a preset error range, it is determined that the energy storage battery does not have a suspected internal short circuit fault; If the comparison result does not meet the preset error range, it is determined that the energy storage battery has a suspected internal short circuit fault.

3. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 1, wherein The step of calculating a current heat generation amount and a set of internal material temperature values of the energy storage battery comprises: Obtaining a set of surface temperature values of the energy storage battery and the second electrical characteristic, and calculating a current heat generation amount of the energy storage battery according to the set of surface temperature values, the second electrical characteristic, and the heat generation model created in advance; Obtaining material parameters of the energy storage battery, and calculating a set of internal material temperature values of the energy storage battery according to the set of surface temperature values, the material parameters, and the heat transfer model created in advance.

4. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 3, wherein The second electrical characteristic comprises a charging and discharging current, a terminal voltage, and a current state of charge.

5. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 4, wherein The step of calculating a current heat generation amount of the energy storage battery according to the set of surface temperature values, the second electrical characteristic, and the heat generation model created in advance comprises: Determining an open circuit voltage of the energy storage battery according to the current state of charge; Calculating a set of current heat generation amounts of the energy storage battery according to the charging and discharging current, the terminal voltage, the open circuit voltage, the set of surface temperature values, and the heat generation model created in advance; Comparing all current heat generation amounts in the set of current heat generation amounts, determining a current maximum heat generation amount in the set of current heat generation amounts, and taking the current maximum heat generation amount as the current heat generation amount of the energy storage battery.

6. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 1, wherein The step of determining a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values comprises: Calculating a set of internal heat generation surfaces of the energy storage battery according to the current heat generation amount and the set of internal material temperature values; Determining an intersection of all internal heat generation surfaces in the set of internal heat generation surfaces, and determining the heat accumulation position of the energy storage battery according to the intersection.

7. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 1, wherein The step of determining whether an internal short circuit fault of the energy storage battery occurs according to the suspected internal short circuit fault and the heat accumulation position comprises: If it is determined that the energy storage battery has the suspected internal short circuit fault, the heat accumulation position is compared with a pre-constructed internal structure model of the energy storage battery to determine a component position corresponding to the heat accumulation position; It is determined whether the component position is an internal short circuit fault component position; If the component position is the internal short circuit fault component position, it is determined that the energy storage battery has an internal short circuit fault; If the component position is not the internal short circuit fault component position, it is determined that the energy storage battery does not have an internal short circuit fault.

8. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 7, wherein The internal short circuit fault component position includes a positive electrode, a negative electrode, or a separator.

9. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 7, wherein The step of comparing the heat accumulation position with the pre-constructed internal structure model of the energy storage battery to determine the component position corresponding to the heat accumulation position includes: Determining a first coordinate corresponding to the heat accumulation position in the internal structure model of the energy storage battery; Respectively acquiring a second coordinate corresponding to all component positions in the internal structure model of the energy storage battery, and determining the component position corresponding to the heat accumulation position according to the first coordinate and the second coordinate.

10. The method of diagnosing an internal short circuit fault of an energy storage battery according to claim 7, wherein After the step of determining that the energy storage battery has an internal short circuit fault if the component position is the internal short circuit fault component position, the method further includes: Determining a fault mechanism according to the component position, and issuing an alarm information according to the component position and the fault mechanism; Generating an internal short circuit fault repair scheme according to the fault position and the fault mechanism.

11. An apparatus for diagnosing an internal short circuit fault of an energy storage battery, characterized by comprising: The internal short circuit fault diagnosis device of the energy storage battery includes: A prediction module configured to acquire a first electrical characteristic of an energy storage battery, and predict whether the energy storage battery has a suspected internal short circuit fault according to the first electrical characteristic; A calculation module configured to calculate a current heat generation amount and a set of internal material temperature values of the energy storage battery, and determine a heat accumulation position of the energy storage battery according to the current heat generation amount and the set of internal material temperature values, wherein the current heat generation amount is calculated based on a set of surface temperature values of the energy storage battery, a pre-acquired second electrical characteristic, and a pre-created heat generation model; A determination module configured to determine whether the energy storage battery has an internal short circuit fault according to the suspected internal short circuit fault and the heat accumulation position.

12. An internal short circuit fault diagnosis system of an energy storage battery, characterized by, The internal short circuit fault diagnosis system of the energy storage battery includes a memory, a processor, and an internal short circuit fault diagnosis program of the energy storage battery stored on the memory and executable on the processor, wherein the internal short circuit fault diagnosis program of the energy storage battery, when executed by the processor, implements the steps of the internal short circuit fault diagnosis method of the energy storage battery according to any one of claims 1 to 10.

13. A storage medium, characterized by The storage medium stores an internal short circuit fault diagnosis program of the energy storage battery, and the internal short circuit fault diagnosis program of the energy storage battery, when executed by the processor, implements the steps of the internal short circuit fault diagnosis method of the energy storage battery according to any one of claims 1 to 10.

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