Method, device, medium and electronic equipment for detecting characteristic parameters of short circuit in battery

Abstract

The present application relates to the field of battery detection technology, and discloses a method, device, medium and electronic device for detecting characteristic parameters of internal short circuits in batteries. The method includes: obtaining an external voltage characteristic curve of a target battery when it is subjected to constant current external discharge according to various set current values; obtaining an internal voltage characteristic curve of the target battery when an internal short circuit occurs; matching each external voltage characteristic curve with the internal voltage characteristic curve, and determining the external voltage characteristic curve with the highest matching degree as the target external voltage characteristic curve; and determining the internal short circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve. The present application can improve the accuracy of detecting characteristic parameters of internal short circuits in batteries.

Description

Background Art

[0002] In recent years, new energy vehicle accidents caused by battery safety issues have occurred frequently, causing public concern. In the prior art, the detection of battery performance mainly evaluates the battery's internal short-circuit safety performance by observing whether the battery smokes, catches fire, explodes, etc. when a short circuit occurs in the battery, as well as the temperature rise of the battery. However, these evaluation methods based on the external performance of the battery during an internal short circuit are too qualitative, making the battery detection results inaccurate. Based on this, how to improve the accuracy of the detection of the characteristic parameters of the internal short circuit of the battery, and then improve the accuracy of battery detection, is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present application is to provide a method, device, medium and electronic device for detecting characteristic parameters of a short circuit in a battery. The present application can improve the accuracy of detecting characteristic parameters of a short circuit in a battery.

[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0005] According to one aspect of an embodiment of the present application, a method for detecting characteristic parameters of an internal short circuit in a battery is provided, the method comprising: obtaining an external voltage characteristic curve of a target battery when performing constant current external discharge at various set current values; obtaining an internal voltage characteristic curve of the target battery when an internal short circuit occurs; matching each external voltage characteristic curve with the internal voltage characteristic curve, and determining an external voltage characteristic curve with the highest matching degree as a target external voltage characteristic curve; and determining the internal short circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve.

[0006] In one embodiment of the present application, based on the above scheme, before obtaining the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the method further includes: performing a needle puncture treatment on the target battery according to different needle puncture test parameters to simulate the internal short circuit process of the target battery;

[0007] In one embodiment of the present application, based on the aforementioned scheme, the method further includes: obtaining internal short-circuit characteristic parameters of target batteries of different models under the same puncture test parameters to obtain multiple groups of first internal short-circuit characteristic parameters; comparing the multiple groups of first internal short-circuit characteristic parameters to evaluate the battery performance of target batteries of different models under the same puncture test parameters.

[0008] In one embodiment of the present application, based on the aforementioned scheme, the method further includes: obtaining internal short circuit characteristic parameters of the same target battery under different puncture test parameters to obtain multiple groups of second internal short circuit characteristic parameters; comparing the multiple groups of second internal short circuit characteristic parameters to evaluate the battery performance of the same target battery under different puncture test parameters.

[0009] In one embodiment of the present application, based on the aforementioned scheme, the internal short-circuit characteristic parameter of the target battery is determined according to the set current value corresponding to the target external voltage characteristic curve, including: determining the set current value corresponding to the target external voltage characteristic curve as the internal short-circuit current of the target battery; calculating the internal short-circuit resistance of the target battery according to the internal short-circuit current; calculating the internal short-circuit thermal power of the target battery according to the internal short-circuit current and the internal short-circuit resistance; determining at least one of the internal short-circuit current, the internal short-circuit resistance, and the internal short-circuit thermal power as the internal short-circuit characteristic parameter of the target battery.

[0010] In one embodiment of the present application, based on the aforementioned scheme, after determining the internal short-circuit characteristic parameters of the target battery, the method further includes: real-time monitoring of the internal short-circuit current of the target battery as the real-time internal short-circuit current; if the real-time internal short-circuit current exceeds the set current threshold, issuing an early warning prompt for the target battery.

[0011] In one embodiment of the present application, based on the aforementioned scheme, after determining the internal short-circuit characteristic parameters of the target battery, the method further includes: real-time monitoring of the internal short-circuit resistance of the target battery as the real-time internal short-circuit resistance; if the real-time internal short-circuit resistance is lower than the set resistance threshold, issuing an early warning prompt for the target battery.

[0012] According to one aspect of an embodiment of the present application, a device for detecting characteristic parameters of an internal short circuit in a battery is provided, the device comprising: a first acquisition unit, used to acquire an external voltage characteristic curve of a target battery when performing constant current external discharge according to various set current values; a second acquisition unit, used to acquire an internal voltage characteristic curve of the target battery when an internal short circuit occurs; a matching unit, used to match various external voltage characteristic curves with the internal voltage characteristic curve, and determine the external voltage characteristic curve with the highest matching degree as the target external voltage characteristic curve; and a determination unit, used to determine the internal short circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve.

[0013] According to one aspect of the embodiments of the present application, a computer program product or a computer program is provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method for detecting the characteristic parameters of a short circuit in a battery as described in the above embodiments.

[0014] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the method for detecting characteristic parameters of a short circuit in a battery as described in the above embodiment is implemented.

[0015] According to one aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement a method for detecting characteristic parameters of a short circuit in a battery as described in the above embodiment.

[0016] In the technical solution of the embodiment of the present application, by obtaining the external voltage characteristic curve of the target battery when it is subjected to constant current external discharge according to each set current value and the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the target external voltage characteristic curve with the highest matching degree with the internal voltage characteristic curve can be determined among the external voltage characteristic curves, and then the internal short circuit characteristic parameters of the target battery are determined according to the set current value corresponding to the target external voltage characteristic curve. Since the present application compares the internal voltage characteristic curve of the target battery when an internal short circuit occurs with the external voltage characteristic curve of the battery determined in advance during constant current external discharge, the characteristic parameters of the battery with an internal short circuit can be determined in real time. In addition to improving the accuracy of the detection of the internal short circuit characteristic parameters of the battery, the performance of the battery can also be quantitatively evaluated, thereby improving the accuracy of battery detection.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 It is a flow chart of a method for detecting characteristic parameters of a short circuit in a battery according to an embodiment of the present application;

[0020] Figure 2 A detailed flow chart of determining the internal short-circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve according to an embodiment of the present application;

[0021] Figure 3 This is the equivalent circuit model diagram of the short circuit in the battery;

[0022] Figure 4 This is a comparison diagram of the internal voltage characteristic curve and the external voltage characteristic curve during acupuncture with a 5mm steel needle for battery A cell;

[0023] Figure 5 This is a comparison diagram of the internal voltage characteristic curve and the external voltage characteristic curve during the acupuncture process of the battery A cell with a 1mm steel needle;

[0024] Figure 6 This is a comparison diagram of the internal voltage characteristic curve and the external voltage characteristic curve during acupuncture with a 5mm steel needle for battery B cell;

[0025] Figure 7 It is a block diagram of a device for detecting characteristic parameters of a short circuit in a battery according to an embodiment of the present application;

[0026] Figure 8 It is a schematic diagram of the system structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0028] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0029] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0030] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0031] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0032] The implementation details of the technical solution of the embodiment of the present application are described in detail below:

[0033] First of all, it should be noted that the detection scheme of the characteristic parameters of the internal short circuit of the battery proposed in this application can be applied to the lithium battery detection scenario of new energy vehicles. Internal short circuit is one of the most common causes of safety runaway accidents in lithium batteries. Under the abuse conditions of external force, electricity, heat, etc., as well as quality defects in the battery manufacturing process and the mixing of foreign matter, the positive and negative poles of the lithium battery may be short-circuited, triggering the internal short circuit. The heat generated by the internal short circuit causes the local temperature rise of the battery, which in turn causes a larger-scale internal short circuit. The heat continues to accumulate, and eventually triggers a chain reaction of thermal runaway, leading to safety accidents such as fire and explosion. Therefore, it is particularly important to evaluate the battery performance before the battery is put into use, or to detect the characteristic parameters of the internal short circuit of the battery during the use of the battery.

[0034] According to one aspect of the present application, a method for detecting characteristic parameters of a short circuit in a battery is provided. Figure 1 The flowchart of the method for detecting the characteristic parameters of the short circuit in the battery according to the embodiment of the present application is shown. The method for detecting the characteristic parameters of the short circuit in the battery can be performed by a device with a computing and processing function. The method for detecting the characteristic parameters of the short circuit in the battery at least includes steps 110 to 140, which are described in detail as follows:

[0035] In step 110, an external voltage characteristic curve of the target battery is obtained when the target battery is subjected to constant current external discharge according to various set current values.

[0036] In this application, the target battery can first be controlled to perform constant current external discharge according to different preset current values, and the external voltage characteristic curve of the battery can be obtained at the same time. For example, lithium batteries with different SOCs (0-100%) are subjected to constant current external discharge with different currents (0.1A-500A) to obtain the external voltage characteristic curve of the lithium battery.

[0037] In the present application, the external voltage characteristic curves corresponding to different set current values ​​obtained can be used for the subsequent detection of short-circuit characteristic parameters in the battery.

[0038] Continue to refer to Figure 1 In step 120, an internal voltage characteristic curve of the target battery when an internal short circuit occurs is obtained.

[0039] When a short circuit occurs inside the target battery, voltage and current will be generated inside the target battery. Therefore, an internal voltage characteristic curve of the target battery when an internal short circuit occurs can be collected.

[0040] Continue to refer to Figure 1 In step 130, each external voltage characteristic curve is matched with the internal voltage characteristic curve, and the external voltage characteristic curve with the highest matching degree is determined as the target external voltage characteristic curve.

[0041] In the present application, the matching of each external voltage characteristic curve with the internal voltage characteristic curve may be performed by determining the external voltage characteristic curve with the highest matching degree according to the degree of overlap between each external voltage characteristic curve and the internal voltage characteristic curve.

[0042] Continue to refer to Figure 1 In step 140, the internal short-circuit characteristic parameter of the target battery is determined according to the set current value corresponding to the target external voltage characteristic curve.

[0043] In the present application, since the target external voltage characteristic curve has a high degree of matching with the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the circuit characteristic parameters corresponding to the target external voltage characteristic curve can be equivalent to the internal short circuit characteristic parameters of the target battery when an internal short circuit occurs. Furthermore, the internal short circuit characteristic parameters of the target battery can be determined according to the set current value corresponding to the target external voltage characteristic curve.

[0044] Specifically, in one embodiment of the present application, the internal short circuit characteristic parameter of the target battery is determined according to the set current value corresponding to the target external voltage characteristic curve, which can be performed as follows: Figure 2 Follow the steps shown.

[0045] See also Figure 2, is a detailed flow chart of determining the internal short-circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve according to an embodiment of the present application. Specifically, it includes steps 151 to 154:

[0046] Step 151: determine a set current value corresponding to the target external voltage characteristic curve as the internal short-circuit current of the target battery.

[0047] Step 152: Calculate the internal short-circuit resistance of the target battery according to the internal short-circuit current.

[0048] Step 153: Calculate the internal short-circuit thermal power of the target battery according to the internal short-circuit current and the internal short-circuit resistance.

[0049] Step 154 ​​, determining at least one of the internal short-circuit current, the internal short-circuit resistance, and the internal short-circuit thermal power as an internal short-circuit characteristic parameter of the target battery.

[0050] In order to make those skilled in the art better understand this embodiment, Figure 3 Provide a brief explanation.

[0051] See also Figure 3 , which is the equivalent circuit model diagram of the short circuit in the battery.

[0052] like Figure 3 As shown, according to the battery internal short circuit equivalent model, R ISC =U / I ISC Calculate the internal short-circuit resistance R ISC , can be further based on Calculate the internal short-circuit thermal power W.

[0053] It can be seen that the larger the internal short-circuit current (i.e., the smaller the internal short-circuit resistance), the higher the heat generated during the battery internal short-circuit process, and the higher the risk of battery fire and explosion. Therefore, this method can be used to obtain the internal short-circuit current value and internal short-circuit resistance value of different batteries or the same battery in different states.

[0054] In the present application, based on the internal voltage characteristic curve of the battery when an internal short circuit occurs, by pre-acquiring the external voltage characteristic curve of the battery when performing constant current external discharge according to various set current values ​​as reference data, the internal short circuit characteristic parameters of the battery can be detected conveniently and accurately.

[0055] In this application, the above Figure 1 The detection scheme of the short-circuit characteristic parameters in the battery shown can be specifically applied to the scenario of evaluating the battery performance before the battery is put into use, and can also be applied to the scenario of monitoring the battery safety during the use of the battery.

[0056] The technical solutions proposed in this application will be further disclosed below based on the perspectives of these two scenarios.

[0057] In the scenario of evaluating battery performance before the battery is put into use:

[0058] In one embodiment of the present application, before obtaining the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the target battery may be subjected to a needle puncture treatment according to different needle puncture test parameters to simulate the internal short circuit process of the target battery.

[0059] Specifically, for example, the lithium battery can be adjusted to a certain SOC (0-100%), and the puncture test parameters, such as the thickness, material, puncture speed, puncture depth, puncture temperature, etc. of the needle, can be adjusted to perform a puncture test on the lithium battery, and the battery voltage change curve over time during the puncture test can be recorded (i.e., the external voltage characteristic curve of the lithium battery).

[0060] In one embodiment of the present application, the following steps 161 to 162 may be performed:

[0061] Step 161, obtaining internal short-circuit characteristic parameters of target batteries of different models under the same puncture test parameters, and obtaining multiple groups of first internal short-circuit characteristic parameters.

[0062] Step 162 , comparing the plurality of groups of first internal short circuit characteristic parameters to evaluate the battery performance of target batteries of different models under the same puncture test parameters.

[0063] In another embodiment of the present application, the following steps 171 to 172 may also be performed:

[0064] Step 171, obtaining internal short-circuit characteristic parameters of the same target battery under different puncture test parameters, and obtaining multiple groups of second internal short-circuit characteristic parameters.

[0065] Step 172, comparing the plurality of groups of second internal short circuit characteristic parameters to evaluate the battery performance of the same target battery under different puncture test parameters.

[0066] In order to make those skilled in the art better understand the above two embodiments, the following will be based on three specific embodiments, combined with 4, Figure 5 , Figure 6 Provide explanation.

[0067] Example 1: First, perform external discharge on lithium battery A with 100% SOC, and the discharge currents are 1A, 2A, 3A, 4A, 5A, and 6A respectively, to obtain its external voltage characteristic curve at different currents. Then, charge lithium battery A to full charge, i.e., 100% SOC state, according to the standard charging method. Perform a puncture test on the lithium battery to simulate an internal short circuit in the lithium battery. The puncture test parameters are: 5mm steel needle, 25mm / s puncture test speed, and penetrate the lithium battery. Record the curve of the voltage change of lithium battery A over time during the puncture test to obtain the internal voltage characteristic curve. Finally, compare the external voltage characteristic curve with the internal voltage characteristic curve, and refer to Figure 4 , which is a comparison of the internal voltage characteristic curve and the external voltage characteristic curve of the battery A cell during the 5mm steel needle puncture process. It can be judged that the voltage change curve of battery A during the 5mm steel needle puncture process is most consistent with the discharge curve at 2A, so it can be determined that the internal short-circuit current when the acupuncture causes an internal short circuit in the battery is 2A.

[0068] Example 2: First, perform external discharge on lithium battery A with 100% SOC, with discharge currents of 0.5A, 1A, 1.5A, and 2A, respectively, to obtain its external voltage characteristic curve at different currents. Then, charge lithium battery A to full charge, i.e., 100% SOC state, according to the standard charging method. Perform a puncture test on the lithium battery to simulate an internal short circuit in the lithium battery. The puncture test parameters are: 1mm steel needle, 0.1mm / s puncture test speed, and penetrate the lithium battery. Record the curve of the voltage change of lithium battery A over time during the puncture test to obtain the internal voltage characteristic curve. Finally, compare the external voltage characteristic curve with the internal voltage characteristic curve, see Figure 5 , which is a comparison diagram of the internal voltage characteristic curve and the external voltage characteristic curve of the battery A cell during the 1mm steel needle puncture process. It can be judged that the voltage change curve of battery A during the 1mm steel needle puncture process is most consistent with the discharge curve at 0.5A, so it can be determined that the internal short-circuit current when the acupuncture causes an internal short circuit in the battery is 0.5A.

[0069] By comparing Example 1 with Example 2, it can be seen that since the needle puncture test conditions used in Example 2 are milder, the severity of the internal short circuit of the battery is obviously lower than that of Example 1. By using the method provided by the patent application, the internal short circuit current of the battery in Example 2 is also lower than that of Example 1, the battery releases less heat, and the battery safety state is better. Therefore, the method provided by the patent application can quantitatively evaluate the danger level of the battery internal short circuit.

[0070] Example 3: Externally discharge battery B at 100% SOC with discharge currents of 1A, 2A, 3A, 4A, 5A, 6A, 7A, and 8A to obtain its external voltage characteristic curve at different currents. Then, charge lithium battery B to full charge, i.e., 100% SOC state, according to the standard charging method. Perform a puncture test on the lithium battery to simulate an internal short circuit in the lithium battery. The puncture test parameters are: 5mm steel needle, 25mm / s puncture test speed, and penetrate the lithium battery. Record the curve of the voltage change of lithium battery B over time during the puncture test to obtain the internal voltage characteristic curve. Finally, compare the external voltage characteristic curve with the internal voltage characteristic curve for reference. Figure 6 , which is a comparison diagram of the internal voltage characteristic curve and the external voltage characteristic curve of the battery B cell during the 5mm steel needle puncture process. It can be judged that the voltage change curve of battery B during the 5mm steel needle puncture process is most consistent with the discharge curve at 8A, so it can be determined that the internal short-circuit current when the acupuncture causes an internal short circuit in the battery is 8A.

[0071] By comparing Example 1 with Example 3, it can be seen that under the same needle puncture test conditions, the internal short-circuit current value of battery B is greater than that of battery A, indicating that under the same needle puncture test conditions, battery B generates more heat and has a higher risk of fire and explosion. Therefore, the method provided by this patent application can quantitatively evaluate the safety of different batteries, thereby guiding battery selection.

[0072] Monitoring scenarios for battery safety during battery use:

[0073] In one embodiment of the present application, after determining the internal short circuit characteristic parameters of the target battery, the following steps 181 to 182 may be performed:

[0074] Step 181 , monitoring the internal short-circuit current of the target battery in real time as the real-time internal short-circuit current.

[0075] Step 182: If the real-time internal short-circuit current exceeds a set current threshold, a warning prompt is issued for the target battery.

[0076] In another embodiment of the present application, after determining the internal short circuit characteristic parameters of the target battery, the following steps 191 to 192 may also be performed:

[0077] Step 191 , monitoring the internal short-circuit resistance of the target battery in real time as the real-time internal short-circuit resistance.

[0078] Step 192: If the real-time internal short-circuit resistance is lower than a set resistance threshold, a warning prompt is issued for the target battery.

[0079] In the present application, based on the above two embodiments, specifically, the battery internal short circuit warning current I can be defined as ISCk(or internal short circuit warning resistor R ISCk ), during the use of the battery, for example, during the use of the battery in a new energy vehicle, the battery management system can monitor and analyze the voltage of the new energy vehicle using the same lithium battery. During the operation of the new energy vehicle, when the lithium battery has an internal short circuit, the battery management system can detect a sudden drop in voltage. The monitored internal voltage characteristic curve is compared with the predetermined external voltage characteristic curve, and the internal short circuit current I of this internal short circuit is determined according to the degree of curve matching. ISCR , when I ISCR ≥Internal short circuit warning current I ISCk When (or R ISCR ≤Internal short circuit warning resistor R ISCk ), and issue a reminder, requiring the user to go to after-sales service for battery maintenance as soon as possible. This application calculates the internal short-circuit current and internal short-circuit resistance value of the battery with internal short-circuit in real time. When the internal short-circuit current and internal short-circuit resistance value of the battery are monitored to exceed the preset threshold, the user is reminded to maintain the battery in time, realizing the power battery internal short-circuit safety warning to avoid safety accidents.

[0080] It should be noted that in this application, it is not limited to the determination of the internal short-circuit current of the battery caused by internal short-circuit due to acupuncture, but can also be applied to the internal short-circuit caused by the external force, electricity, heat, quality defects in the battery manufacturing process and foreign matter mixing. In addition, the application scope of this application is not limited to lithium-ion batteries, but also includes sodium-ion batteries, potassium-ion batteries, lithium-sulfur batteries, lithium-air batteries and other new system batteries.

[0081] In summary, by obtaining the external voltage characteristic curve of the target battery when it is subjected to constant current external discharge according to each set current value and the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the target external voltage characteristic curve with the highest matching degree with the internal voltage characteristic curve can be determined among the external voltage characteristic curves, and then the internal short circuit characteristic parameters of the target battery can be determined according to the set current value corresponding to the target external voltage characteristic curve. Since the present application compares the internal voltage characteristic curve of the target battery when an internal short circuit occurs with the external voltage characteristic curve of the battery determined in advance during constant current external discharge, the characteristic parameters of the battery with an internal short circuit can be determined in real time. In addition to improving the accuracy of the detection of the internal short circuit characteristic parameters of the battery, the performance of the battery can also be quantitatively evaluated, thereby improving the accuracy of battery detection.

[0082] The following describes an embodiment of the device of the present application, which can be used to execute the method for detecting the characteristic parameters of the short circuit in the battery in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method for detecting the characteristic parameters of the short circuit in the battery in the above embodiment of the present application.

[0083] Figure 7 The block diagram is a device for detecting characteristic parameters of a short circuit in a battery according to an embodiment of the present application.

[0084] Reference Figure 7 As shown, according to an embodiment of the present application, a device 700 for detecting characteristic parameters of a short circuit in a battery includes: a first acquisition unit 701 , a second acquisition unit 702 , a matching unit 703 and a determination unit 704 .

[0085] Among them, the first acquisition unit 701 is used to obtain the external voltage characteristic curve of the target battery when it is subjected to constant current external discharge according to various set current values; the second acquisition unit 702 is used to obtain the internal voltage characteristic curve of the target battery when an internal short circuit occurs; the matching unit 703 is used to match each external voltage characteristic curve with the internal voltage characteristic curve, and determine the external voltage characteristic curve with the highest matching degree as the target external voltage characteristic curve; the determination unit 704 is used to determine the internal short circuit characteristic parameters of the target battery according to the set current value corresponding to the target external voltage characteristic curve.

[0086] As another aspect, the present application also provides a computer-readable storage medium on which is stored a program product capable of implementing the above-mentioned method for detecting the characteristic parameters of the short circuit in the battery in this specification. In some possible implementations, various aspects of the present application can also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present application described in the above-mentioned "Example Method" section of this specification.

[0087] According to the program product for implementing the above method in the embodiment of the present application, it can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0088] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0089] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0090] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0091] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0092] As another aspect, the present application also provides an electronic device capable of implementing the above method.

[0093] Those skilled in the art will appreciate that various aspects of the present application may be implemented as a system, method or program product. Therefore, various aspects of the present application may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to as "circuit", "module" or "system" herein.

[0094] Refer to the following Figure 8 hereinafter describes an electronic device 800 according to this embodiment of the present application. Figure 8 The electronic device 800 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0095] like Figure 8 As shown, the electronic device 800 is in the form of a general computing device. The components of the electronic device 800 may include but are not limited to: at least one processing unit 810, at least one storage unit 820, and a bus 830 connecting different system components (including the storage unit 820 and the processing unit 810).

[0096] The storage unit stores program codes, which can be executed by the processing unit 810, so that the processing unit 810 executes the steps described in the above “Example Method” section of this specification according to various exemplary implementations of the present application.

[0097] The storage unit 820 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 821 and / or a cache memory unit 822 , and may further include a read-only memory unit (ROM) 823 .

[0098] The storage unit 820 may also include a program / utility 824 having a set (at least one) of program modules 825, such program modules 825 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0099] Bus 830 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0100] The electronic device 800 may also communicate with one or more external devices 1200 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 800, and / or communicate with any device that enables the electronic device 800 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 850. Furthermore, the electronic device 800 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 860. As shown, the network adapter 860 communicates with other modules of the electronic device 800 via a bus 830. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0101] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0102] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0103] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for detecting characteristic parameters of a short circuit in a battery, characterized in that: The method comprises: Obtaining an external voltage characteristic curve of the target battery when performing constant current external discharge according to various set current values; Obtaining an internal voltage characteristic curve of the target battery when an internal short circuit occurs; Matching each external voltage characteristic curve with the internal voltage characteristic curve, and determining the external voltage characteristic curve with the highest matching degree as the target external voltage characteristic curve; The internal short-circuit characteristic parameter of the target battery is determined according to the set current value corresponding to the target external voltage characteristic curve.

2. The method according to claim 1, characterized in that Before obtaining the internal voltage characteristic curve of the target battery when an internal short circuit occurs, the method further includes: According to different puncture test parameters, the target battery is subjected to puncture treatment to simulate the internal short circuit process of the target battery.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining internal short-circuit characteristic parameters of target batteries of different models under the same puncture test parameters to obtain multiple groups of first internal short-circuit characteristic parameters; The multiple groups of first internal short-circuit characteristic parameters are compared to evaluate the battery performance of target batteries of different models under the same puncture test parameters.

4. The method according to claim 2, characterized in that: The method further comprises: Obtaining internal short-circuit characteristic parameters of the same target battery under different puncture test parameters to obtain multiple groups of second internal short-circuit characteristic parameters; The multiple groups of second internal short-circuit characteristic parameters are compared to evaluate the battery performance of the same target battery under different puncture test parameters.

5. The method according to claim 1, characterized in that The step of determining the internal short-circuit characteristic parameter of the target battery according to the set current value corresponding to the target external voltage characteristic curve includes: Determining a set current value corresponding to the target external voltage characteristic curve as an internal short-circuit current of the target battery; Calculating the internal short-circuit resistance of the target battery according to the internal short-circuit current; Calculating the internal short-circuit thermal power of the target battery according to the internal short-circuit current and the internal short-circuit resistance; At least one of the internal short-circuit current, the internal short-circuit resistance, and the internal short-circuit heat power is determined as an internal short-circuit characteristic parameter of the target battery.

6. The method according to claim 5, characterized in that After determining the internal short circuit characteristic parameters of the target battery, the method further includes: Monitoring the internal short-circuit current of the target battery in real time as the real-time internal short-circuit current; If the real-time internal short-circuit current exceeds a set current threshold, an early warning prompt is issued for the target battery.

7. The method according to claim 5, characterized in that After determining the internal short circuit characteristic parameters of the target battery, the method further includes: Monitoring the internal short-circuit resistance of the target battery in real time as the real-time internal short-circuit resistance; If the real-time internal short-circuit resistance is lower than the set resistance threshold, an early warning prompt is issued for the target battery.

8. A device for detecting characteristic parameters of short circuit in a battery, characterized in that: The device comprises: A first acquisition unit is used to acquire an external voltage characteristic curve of the target battery when performing constant current external discharge according to various set current values; A second acquisition unit is used to acquire an internal voltage characteristic curve of the target battery when an internal short circuit occurs; A matching unit is used to match each external voltage characteristic curve with the internal voltage characteristic curve, and determine the external voltage characteristic curve with the highest matching degree as the target external voltage characteristic curve; The determination unit is used to determine the internal short-circuit characteristic parameter of the target battery according to the set current value corresponding to the target external voltage characteristic curve.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 7.

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