Battery short circuit fault detection method, detection device, electronic equipment and storage medium

Abstract

The application provides a battery short-circuit fault detection method, a detection device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a measurement value of a battery terminal voltage at two different times, and recording the measurement value as a first terminal voltage measurement value and a second terminal voltage measurement value; acquiring an open-circuit voltage expression corresponding to the time, and recording the expression as a first open-circuit voltage expression and a second open-circuit voltage expression; wherein the first open-circuit voltage expression and the second open-circuit voltage expression are both expressions related to an equivalent short-circuit resistance; calculating the resistance value of the equivalent short-circuit resistance based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression and the second open-circuit voltage expression; and detecting whether the battery has a short-circuit fault based on the resistance value. Thus, the method can quickly and accurately detect whether a short-circuit fault occurs in the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method, detection device, electronic device, and storage medium for detecting battery short circuit faults. Background Technology

[0002] Lithium-ion batteries, with their high energy density and lack of memory effect, have become the preferred solution for electrochemical energy storage. Lithium-ion batteries are crucial for the safe operation of energy storage power stations. However, as batteries age, the probability of internal short circuits increases significantly. Once an internal short circuit occurs, it can potentially lead to serious consequences such as fires.

[0003] Therefore, detecting battery short-circuit faults is an urgent problem to be solved. Summary of the Invention

[0004] The present invention aims to solve, to a certain extent, the technical problems in the related technologies.

[0005] Therefore, the first objective of this invention is to provide a battery short-circuit fault detection method that can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0006] The second objective of this invention is to provide a battery short-circuit fault detection device.

[0007] The third objective of this invention is to provide an electronic device.

[0008] The fourth objective of this invention is to provide a computer-readable storage medium.

[0009] The fifth objective of this invention is to provide a computer program product.

[0010] To achieve the above objectives, a first aspect of the present invention provides a battery short-circuit fault detection method, comprising the following steps: acquiring measured values ​​of the battery terminal voltage at two different times, denoted as a first terminal voltage measurement value and a second terminal voltage measurement value; acquiring open-circuit voltage expressions for the corresponding times, denoted as a first open-circuit voltage expression and a second open-circuit voltage expression; wherein, both the first open-circuit voltage expression and the second open-circuit voltage expression are expressions related to the equivalent short-circuit resistance; calculating the resistance value of the equivalent short-circuit resistance based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression; and detecting whether the battery has experienced a short-circuit fault based on the resistance value.

[0011] According to the battery short-circuit fault detection method of the present invention, the battery terminal voltage is measured at two different times, denoted as the first terminal voltage measurement value and the second terminal voltage measurement value. The open-circuit voltage expression for each corresponding time is also obtained, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression. Both the first and second open-circuit voltage expressions are related to the equivalent short-circuit resistance. Then, based on the first and second terminal voltage measurements, the first and second open-circuit voltage expressions, the equivalent short-circuit resistance is calculated, and based on this resistance value, the short-circuit fault is detected. Therefore, this method can quickly and accurately detect whether a short-circuit fault has occurred within the battery.

[0012] In addition, the battery short-circuit fault detection method proposed in the first aspect of the present invention may also have the following additional technical features:

[0013] According to an embodiment of the present invention, obtaining the open-circuit voltage expression at corresponding times includes:

[0014] Based on the ampere-hour integration method, the state of charge at the corresponding time is obtained and denoted as the first state of charge and the second state of charge; wherein, the first state of charge and the second state of charge are both expressions related to the equivalent short-circuit resistance.

[0015] Based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first open-circuit voltage and the second open-circuit voltage corresponding to the first state of charge and the second state of charge are obtained respectively.

[0016] According to an embodiment of the present invention, calculating the equivalent short-circuit resistance based on the first terminal voltage measurement, the second terminal voltage measurement, the first open-circuit voltage expression, and the second open-circuit voltage expression includes:

[0017] Substituting the measured values ​​of the first terminal voltage, the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage into the set relational formula, the resistance value of the equivalent short-circuit resistance is calculated; wherein,

[0018] The defined relationship is that the ratio of the first terminal voltage measurement value to the second terminal voltage measurement value is equal to the ratio of the first open-circuit voltage expression and the second open-circuit voltage expression.

[0019] According to one embodiment of the present invention, detecting whether the battery has a short circuit fault based on the resistance value includes:

[0020] When the resistance value is less than a set resistance value, it is determined that the battery has a short circuit fault; or,

[0021] When the resistance value is greater than or equal to the set resistance value, it is determined that the battery has not experienced a short circuit fault.

[0022] To achieve the above objectives, a second aspect of the present invention provides a battery short-circuit fault detection device, comprising: a first acquisition module, configured to acquire measured values ​​of battery terminal voltage at two different times, denoted as a first terminal voltage measurement value and a second terminal voltage measurement value; a second acquisition module, configured to acquire open-circuit voltage expressions at corresponding times, denoted as a first open-circuit voltage expression and a second open-circuit voltage expression; wherein the first open-circuit voltage expression and the second open-circuit voltage expression are both expressions related to the equivalent short-circuit resistance; a calculation module, configured to calculate the resistance value of the equivalent short-circuit resistance based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression; and a detection module, configured to detect whether a short-circuit fault has occurred in the battery based on the resistance value.

[0023] According to an embodiment of the present invention, a battery short-circuit fault detection device acquires measured values ​​of the battery terminal voltage at two different times using a first acquisition module, denoted as the first terminal voltage measurement value and the second terminal voltage measurement value. A second acquisition module acquires the open-circuit voltage expressions for the corresponding times, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression. Both the first and second open-circuit voltage expressions are related to the equivalent short-circuit resistance. A calculation module calculates the equivalent short-circuit resistance value based on the first and second terminal voltage measurements, the first and second open-circuit voltage expressions, and the second open-circuit voltage expressions. A detection module detects whether a short-circuit fault has occurred in the battery based on the resistance value. Therefore, this device can quickly and accurately detect whether a short-circuit fault has occurred within the battery.

[0024] In addition, the battery short-circuit fault detection device proposed in the second aspect embodiment of the present invention may also have the following additional technical features:

[0025] According to an embodiment of the present invention, when the second acquisition module is used to acquire the open-circuit voltage expression at corresponding times, it includes:

[0026] Based on the ampere-hour integration method, the state of charge at the corresponding time is obtained and denoted as the first state of charge and the second state of charge; wherein, the first state of charge and the second state of charge are both expressions related to the equivalent short-circuit resistance.

[0027] Based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first open-circuit voltage and the second open-circuit voltage corresponding to the first state of charge and the second state of charge are obtained respectively.

[0028] According to an embodiment of the present invention, when the calculation module calculates the resistance value of the equivalent short-circuit resistance based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression, it includes:

[0029] Substituting the measured values ​​of the first terminal voltage, the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage into the set relational formula, the resistance value of the equivalent short-circuit resistance is calculated; wherein,

[0030] The defined relationship is that the ratio of the first terminal voltage measurement value to the second terminal voltage measurement value is equal to the ratio of the first open-circuit voltage expression and the second open-circuit voltage expression.

[0031] According to an embodiment of the present invention, when the detection module is used to detect whether the battery has a short circuit fault based on the resistance value, it includes:

[0032] When the resistance value is less than a set resistance value, it is determined that the battery has a short circuit fault; or,

[0033] When the resistance value is greater than or equal to the set resistance value, it is determined that the battery has not experienced a short circuit fault.

[0034] To achieve the above objectives, a sixth aspect of the present invention provides an electronic device, including a processor and a memory; wherein the processor runs a program corresponding to the executable program code stored in the memory to implement the above-described battery short-circuit fault detection method.

[0035] The electronic device of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0036] To achieve the above objectives, a fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described battery short-circuit fault detection method.

[0037] The computer-readable storage medium of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0038] To achieve the above objectives, a fifth aspect of the present invention provides a computer program product that, when an instruction processor in the computer program product is executed, performs the above-described battery short-circuit fault detection method.

[0039] The computer program product of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0040] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0042] Figure 1 This is a schematic diagram of a battery equivalent circuit model according to an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of an equivalent circuit model of a battery short-circuit fault according to an embodiment of the present invention;

[0044] Figure 3 This is a graph of SOC-OCV under normal battery conditions and battery short-circuit fault conditions according to an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the voltage plateau in the battery discharge OCV-SOC curve according to an embodiment of the present invention;

[0046] Figure 5 This is a partial SOC-OCV curve of a normal battery and an internally short-circuited battery according to an embodiment of the present invention;

[0047] Figure 6 This is a schematic flowchart of a battery short-circuit fault detection method according to an embodiment of the present invention;

[0048] Figure 7 This is a block diagram of a battery short-circuit fault detection device according to an embodiment of the present invention. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] The following description, with reference to the accompanying drawings, describes a battery short-circuit fault detection method, a battery short-circuit fault detection device, an electronic device, and a computer-readable storage medium according to embodiments of the present invention.

[0051] Lithium-ion batteries, with their high energy density and lack of memory effect, have become the preferred solution for electrochemical energy storage. These batteries are crucial for the safe operation of energy storage power stations. However, as batteries age, the probability of internal short-circuit faults increases significantly, which can lead to serious consequences such as fires. Therefore, effective methods are needed to detect internal short-circuit faults in batteries.

[0052] Currently, battery internal short circuit detection methods are categorized into signal detection, model-based, and data-driven methods. Signal detection methods only detect abnormal signals and often fail to provide timely warnings of internal short circuit faults. Model-based methods require online optimization algorithms to identify the parameters of the equivalent short circuit model, making the algorithms complex. Data-driven methods have high computational requirements, which cannot meet the online computational needs of BMS (Battery Management System) systems and exhibit poor robustness. Therefore, a battery short circuit fault detection method that can balance detection accuracy and computational complexity is urgently needed.

[0053] Therefore, this invention proposes a battery short-circuit fault detection method, which can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0054] In one embodiment of the present invention, it is necessary to pre-establish a battery equivalent circuit model, such as... Figure 1 As shown. When a short circuit fault occurs inside the battery, an equivalent circuit model of the battery short circuit can be used, such as... Figure 2 As shown. Where R ISC It is the equivalent short-circuit resistance. In, for example... Figure 2 In the equivalent circuit model of the battery short circuit fault shown, the resistance R ISC Connected in parallel with the battery's equivalent circuit model to simulate a soft short-circuit fault inside the battery, the resistance value is typically tens to hundreds of ohms. A soft short circuit is an early stage of a short circuit within the battery. Therefore, early identification of battery short-circuit faults is crucial for preventing battery thermal runaway.

[0055] For a normal battery equivalent circuit model, according to Kirchhoff's laws, the terminal voltage can be expressed as the following formula (1):

[0056] Vt(t)=Voc(t)+R0I L (t) (1)

[0057] Where Vt(t) is the terminal voltage of the normal battery at time t, and Voc(t) is the open-circuit voltage (OCV) of the normal battery at time t; I L (t) represents the load current of the normal battery at time t. For example... Figure 2 As shown, for the short-circuit fault battery model, the terminal voltage expression can be expressed by the following formula (2) and the following formula (3):

[0058] V t_ISC (t)=Voc(t)+R0(I L (t)-I2(t)) (2)

[0059] V t_ISC (t)=R ISC ×I2(t) (3)

[0060] Among them, V t_ISC It is the terminal voltage of the short-circuited battery at time t, and I2(t) is the loop current containing the equivalent short-circuit resistance. Substituting the above formula (3) into the above formula (2), we can obtain the following formula (4):

[0061]

[0062] Comparing formula (1) with formula (4), it can be found that after a short circuit fault occurs in the battery, the battery terminal voltage has a coefficient. Furthermore, this coefficient is always less than 1. Therefore, when a battery experiencing a short circuit discharges with the same current, its discharge rate is faster than that of a normal battery. Figure 3 As shown, the solid curve represents the discharge curve of a battery with an internal short circuit fault, while the dashed curve represents the discharge curve of a normal battery. As the internal short circuit fault becomes more severe, the amount of electricity consumed by the equivalent short circuit resistance accelerates the battery's discharge process, resulting in a lower usable capacity than a normal battery.

[0063] When the battery is in an open-circuit state, the OCV value can be approximated as the battery terminal voltage. After a short-circuit fault occurs in the battery, the OCV value changes from V... oc (t) becomes The OCV of the battery that will experience a short circuit fault, i.e. Defined as equivalent OCV.

[0064] Because there is a distinct voltage plateau in the battery discharge OCV-SOC curve, such as Figure 4 As shown, the OCV value does not change significantly at the voltage plateau during discharge. However, this invention requires extracting the variation characteristics of the OCV curve to diagnose short-circuit faults. Therefore, to avoid the influence of the voltage plateau on the proposed method, this invention divides the battery discharge OCV curve to find the applicable range of the state of charge (SOC).

[0065] Independent component analysis (ICA) is a widely used method for analyzing battery performance degradation. Therefore, this invention uses ICA to identify voltage plateaus in the OCV curve. For this method, changes in battery capacity are analyzed over the same voltage variation intervals. The independent component (IC) can be obtained by calculating the ratio of a fixed voltage increase to the corresponding capacity increase; in this invention, IC can be calculated using the following formula (5). Where Q...t and V t These are the discharge capacity and voltage at sampling time t, respectively.

[0066] For ease of analysis, the OCV curve is divided into two parts: the plateau region and the slope region. For example... Figure 4 As shown, the plateau region refers to the voltage plateau, which occupies approximately 0-60% of the State of Charge (SOC) range. The ramp region, on the other hand, occupies approximately 60-100% of the SOC range. Therefore, the method described in this invention should operate in the ramp region to avoid the influence of the voltage plateau; the optimal SOC range is 60-100%.

[0067]

[0068] During battery discharge, besides terminal voltage and current, very little data is available for measurement, making it difficult to estimate the equivalent short-circuit resistance. When a battery with an internal short circuit is in an open-circuit state, to reduce the influence of unknown parameters, the current I is... L (t) is 0A. The equivalent OCV of the battery is shown in the following formula (6), which is approximately equal to the terminal voltage V. t_ISC (t):

[0069]

[0070] Therefore, based on the above formula (6), the ratio of the equivalent OCV of the ISC battery under different measurement times can be derived, as shown in the following formula (7):

[0071]

[0072] Among them, V t_ISC (t+n) is the battery terminal voltage at time t+n when a short circuit fault occurs in the battery, V. oc (t+n) is the OCV of a normal battery at time t+n. The battery's terminal voltage can be directly measured, therefore the ratio in the above formula (7) is constant. Meanwhile, the battery OCV is related to the SOC. Figure 5 This is a schematic diagram of the discharge OCV-SOC curves for a normal battery and a short-circuit faulty battery. Figure 5 In this context, these two curves can be obtained through actual measurement, and the State of Charge (SOC) can be calculated by integrating the discharge current using the ampere-hour method. Therefore, if a specific SOC value is known, the corresponding voltage value on the curve can be obtained.

[0073] Based on the above, the battery short-circuit fault detection method of the present invention will be described.

[0074] Figure 6 This is a flowchart of a battery short-circuit fault detection method according to an embodiment of the present invention.

[0075] like Figure 6 As shown, the battery short-circuit fault detection method of this invention includes the following steps:

[0076] S1. At two different times, the measured values ​​of the battery terminal voltage are obtained and recorded as the first terminal voltage measurement value and the second terminal voltage measurement value.

[0077] For example, the battery terminal voltage can be measured using voltage sensors positioned across the battery terminals. At time K, the first terminal voltage measurement value is V. t_ISC (SOC(K)), at time K+N, the measured value of the second terminal voltage is V. t_ISC (SOC(K+N)).

[0078] S2, obtain the open-circuit voltage expressions at the corresponding times, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression; wherein, the first open-circuit voltage expression and the second open-circuit voltage expression are both expressions related to the equivalent short-circuit resistance.

[0079] In this step, the state of charge at corresponding times can be obtained based on the ampere-hour integration method, denoted as the first state of charge and the second state of charge, where both the first and second states of charge are expressions related to the equivalent short-circuit resistance. Then, based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first and second open-circuit voltages corresponding to the first and second states of charge are obtained respectively.

[0080] S3, based on the measured value of the first terminal voltage, the measured value of the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage, calculate the resistance value of the equivalent short-circuit resistance.

[0081] In this step, the measured values ​​of the first terminal voltage, the second terminal voltage, the first open-circuit voltage expression, and the second open-circuit voltage expression are substituted into the set relationship to calculate the equivalent short-circuit resistance value; wherein, the set relationship is that the ratio of the measured value of the first terminal voltage to the measured value of the second terminal voltage is equal to the ratio of the first open-circuit voltage expression and the second open-circuit voltage expression.

[0082] In embodiments of the present invention, the OCV-SOC curve can be obtained by the intermittent pulse method, which yields the functional relationship between the state of charge and the open-circuit voltage.

[0083] When discharging the battery, the discharge capacity of each pulse is p% of the rated capacity, and the discharge current is constant. The battery rests for a relatively long time after each pulse to eliminate polarization, and then repeats the above process. During the battery's resting period, the battery also has a connected discharge circuit, in which the equivalent short-circuit resistance is located in the discharge circuit, and the discharge circuit current changes continuously. Therefore, the actual SOC of a battery that has experienced a short-circuit fault is an unknown function including the equivalent short-circuit resistance, which can be calculated by the ampere-hour integration method, as shown in the following formula (8):

[0084]

[0085] Wherein, SOC(K) is the SOC value at the approximate OCV point after the Kth pulse discharge cycle; is the terminal voltage of the battery with ISC measured at time i in the Kth pulse discharge cycle; m is the total time of each pulse discharge cycle; C is the rated capacity of the battery.

[0086] If the SOC value is known, then by substituting the above formula (8) into the above formula (7), the following formula (9) can be obtained:

[0087]

[0088] Where N is the time index after discretization of n; when the charge is SOC(K), V oc (SOC(K)) is the OCV value of a normal battery, i.e., the expression for the first open-circuit voltage; when the state of charge is SOC(K+N), V oc (SOC(K+N)) is the OCV value of a normal battery, i.e., the expression for the second open-circuit voltage; V t_ISC (SOC(K)) is the terminal voltage of the battery when a short-circuit fault occurs at the state of charge (SOC(K)); V t_ISC (SOC(K+N)) is the terminal voltage of the battery when a short-circuit fault occurs at the state of charge (SOC(K+N)). The above formula (9) contains only one unknown variable, R. ISC Therefore, the equivalent ISC resistance value can be solved.

[0089] S4 detects whether the battery has a short circuit fault based on the resistance value.

[0090] In this step, a short circuit is determined to have occurred in the battery if the resistance value is less than the set resistance value; conversely, no short circuit is determined to have occurred if the resistance value is greater than or equal to the set resistance value. The constant resistance value can be set based on experimental or empirical data.

[0091] The battery short-circuit fault detection method proposed in this invention takes into account changes in key internal battery parameters, resulting in higher accuracy. Furthermore, it requires less computation compared to data-driven methods, is adaptable to various energy storage battery operating scenarios, and exhibits high robustness. In addition, this method is simpler than model-based methods in internal short-circuit diagnosis, eliminating the need for complex parameter identification methods to calculate the battery's internal short-circuit resistance.

[0092] In summary, the battery short-circuit fault detection method according to embodiments of the present invention acquires measured values ​​of the battery terminal voltage at two different times, denoted as the first terminal voltage measurement value and the second terminal voltage measurement value, and acquires the open-circuit voltage expressions for the corresponding times, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression. Both the first and second open-circuit voltage expressions are expressions related to the equivalent short-circuit resistance. Then, based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression, the resistance value of the equivalent short-circuit resistance is calculated, and based on the resistance value, whether a short-circuit fault has occurred in the battery is detected. Therefore, this method can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0093] like Figure 7 As shown, the battery short circuit fault detection device 700 of this embodiment includes: a first acquisition module 710, a second acquisition module 720, a calculation module 730 and a detection module 740.

[0094] The first acquisition module 710 acquires the measured values ​​of the battery terminal voltage at two different times, denoted as the first terminal voltage measurement value and the second terminal voltage measurement value. The second acquisition module 720 acquires the open-circuit voltage expressions at corresponding times, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression; both the first and second open-circuit voltage expressions are related to the equivalent short-circuit resistance. The calculation module 730 calculates the equivalent short-circuit resistance value based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression. The detection module 740 detects whether a short-circuit fault has occurred in the battery based on the resistance value.

[0095] According to one embodiment of the present invention, when the second acquisition module 720 is used to acquire the open-circuit voltage expression at corresponding times, it includes:

[0096] Based on the ampere-hour integration method, the state of charge at the corresponding time is obtained and denoted as the first state of charge and the second state of charge; where the first state of charge and the second state of charge are both expressions related to the equivalent short-circuit resistance.

[0097] Based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first open-circuit voltage and the second open-circuit voltage corresponding to the first state of charge and the second state of charge are obtained respectively.

[0098] According to one embodiment of the present invention, when the calculation module 730 calculates the equivalent short-circuit resistance value based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression, it includes:

[0099] Substituting the measured values ​​of the first terminal voltage, the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage into the established formula, the equivalent short-circuit resistance is calculated; where,

[0100] The relationship is set such that the ratio of the measured value of the first terminal voltage to the measured value of the second terminal voltage is equal to the ratio of the expression for the first open-circuit voltage and the expression for the second open-circuit voltage.

[0101] According to one embodiment of the present invention, the detection module 740, when detecting whether a short circuit fault has occurred in the battery based on the resistance value, includes:

[0102] If the resistance value is less than the set resistance value, a short circuit fault is determined to have occurred in the battery; or,

[0103] If the resistance value is greater than or equal to the set resistance value, it is determined that the battery has not experienced a short circuit fault.

[0104] It should be noted that for details not disclosed in the battery short-circuit fault detection device of the present invention, please refer to the details disclosed in the battery short-circuit fault detection method of the present invention, which will not be repeated here.

[0105] According to an embodiment of the present invention, a battery short-circuit fault detection device acquires measured values ​​of the battery terminal voltage at two different times using a first acquisition module, denoted as the first terminal voltage measurement value and the second terminal voltage measurement value. A second acquisition module acquires the open-circuit voltage expressions for the corresponding times, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression. Both the first and second open-circuit voltage expressions are related to the equivalent short-circuit resistance. A calculation module calculates the equivalent short-circuit resistance value based on the first and second terminal voltage measurements, the first and second open-circuit voltage expressions, and the second open-circuit voltage expressions. A detection module detects whether a short-circuit fault has occurred in the battery based on the resistance value. Therefore, this device can quickly and accurately detect whether a short-circuit fault has occurred within the battery.

[0106] Based on the above embodiments, the present invention also proposes an electronic device.

[0107] The electronic device of this invention includes a processor and a memory; wherein the processor runs a program corresponding to the executable program code by reading executable program code stored in the memory, so as to implement the above-mentioned battery short circuit fault detection method.

[0108] The electronic device of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0109] Based on the above embodiments, the present invention also proposes a computer-readable storage medium.

[0110] The computer-readable storage medium of this invention stores a computer program that, when executed by a processor, implements the above-described battery short-circuit fault detection method.

[0111] The computer-readable storage medium of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0112] Based on the above embodiments, the present invention also proposes a computer program product.

[0113] When the instruction processor in the computer program product of this embodiment of the invention executes, it performs the above-described battery short-circuit fault detection method.

[0114] The computer program product of this invention, by executing the above-described battery short-circuit fault detection method, can quickly and accurately detect whether a short-circuit fault has occurred in the battery.

[0115] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0116] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0117] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0118] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0119] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0120] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0121] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a single module, or each unit can exist physically separately, or two or more units can be integrated into a single module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0122] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for detecting battery short-circuit faults, characterized in that, Includes the following steps: At two different times, the measured values ​​of the battery terminal voltage are obtained and recorded as the first terminal voltage measurement value and the second terminal voltage measurement value. Obtain the open-circuit voltage expressions at the corresponding times, and denote them as the first open-circuit voltage expression and the second open-circuit voltage expression; wherein, both the first open-circuit voltage expression and the second open-circuit voltage expression are expressions related to the equivalent short-circuit resistance; Based on the measured value of the first terminal voltage, the measured value of the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage, calculate the resistance value of the equivalent short-circuit resistance; Based on the resistance value, detect whether the battery has a short circuit fault; The step of obtaining the open-circuit voltage expression at the corresponding time includes: Based on the ampere-hour integration method, the state of charge at the corresponding time is obtained and denoted as the first state of charge and the second state of charge; wherein, the first state of charge and the second state of charge are both expressions related to the equivalent short-circuit resistance. Based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first open-circuit voltage and the second open-circuit voltage corresponding to the first state of charge and the second state of charge are obtained respectively. The step of calculating the equivalent short-circuit resistance based on the first terminal voltage measurement, the second terminal voltage measurement, the first open-circuit voltage expression, and the second open-circuit voltage expression includes: Substituting the measured values ​​of the first terminal voltage, the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage into the set relational formula, the resistance value of the equivalent short-circuit resistance is calculated; wherein, The defined relationship is that the ratio of the first terminal voltage measurement value to the second terminal voltage measurement value is equal to the ratio of the first open-circuit voltage expression and the second open-circuit voltage expression.

2. The method according to claim 1, characterized in that, The step of detecting whether the battery has a short circuit fault based on the resistance value includes: When the resistance value is less than a set resistance value, it is determined that the battery has a short circuit fault; or, When the resistance value is greater than or equal to the set resistance value, it is determined that the battery has not experienced a short circuit fault.

3. A battery short-circuit fault detection device, characterized in that, include: The first acquisition module is used to acquire the measured values ​​of the battery terminal voltage at two different times, which are recorded as the first terminal voltage measurement value and the second terminal voltage measurement value. The second acquisition module is used to acquire the open-circuit voltage expression at the corresponding time, denoted as the first open-circuit voltage expression and the second open-circuit voltage expression; wherein, the first open-circuit voltage expression and the second open-circuit voltage expression are both expressions related to the equivalent short-circuit resistance; The calculation module is used to calculate the resistance value of the equivalent short-circuit resistance based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression; The detection module is used to detect whether the battery has a short circuit fault based on the resistance value; Wherein, when the second acquisition module is used to acquire the open-circuit voltage expression at the corresponding time, it includes: Based on the ampere-hour integration method, the state of charge at the corresponding time is obtained and denoted as the first state of charge and the second state of charge; wherein, the first state of charge and the second state of charge are both expressions related to the equivalent short-circuit resistance. Based on the functional relationship between the state of charge and the open-circuit voltage, the expressions for the first open-circuit voltage and the second open-circuit voltage corresponding to the first state of charge and the second state of charge are obtained respectively. The calculation module, when calculating the equivalent short-circuit resistance value based on the first terminal voltage measurement value, the second terminal voltage measurement value, the first open-circuit voltage expression, and the second open-circuit voltage expression, includes: Substituting the measured values ​​of the first terminal voltage, the second terminal voltage, the expression for the first open-circuit voltage, and the expression for the second open-circuit voltage into the set relational formula, the resistance value of the equivalent short-circuit resistance is calculated; wherein, The defined relationship is that the ratio of the first terminal voltage measurement value to the second terminal voltage measurement value is equal to the ratio of the first open-circuit voltage expression and the second open-circuit voltage expression.

4. The apparatus according to claim 3, characterized in that, The detection module, used to detect whether the battery has a short circuit fault based on the resistance value, includes: When the resistance value is less than a set resistance value, it is determined that the battery has a short circuit fault; or, When the resistance value is greater than or equal to the set resistance value, it is determined that the battery has not experienced a short circuit fault.

5. An electronic device, characterized in that, include: Processor and memory; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the battery short circuit fault detection method as described in claim 1 or 2.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the battery short-circuit fault detection method as described in claim 1 or 2.

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