Welding slag detection method, device and electronic equipment for battery module

Abstract

The present invention provides a method, device and electronic equipment for detecting welding slag of a battery module, which relates to the technical field of battery safety detection, including: constructing a simulation device for simulating the process of breakdown detection of welding slag of a battery module, wherein the simulation device includes a metal rod, a first metal plate and a second metal plate; the metal rod is energized / externally connected to an electric current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to characterize the battery planes parallel to the battery modules; according to different mapping combinations of the spacing between the metal rod and the second metal plate and the diameter of the metal rod, a fitting formula for the critical value of the breakdown voltage is constructed; according to the fitting formula for the critical value of the breakdown voltage, the breakdown voltage of the current battery module for detecting welding slag is determined, thereby alleviating the above-mentioned technical problem of not being able to simultaneously consider battery safety and accurate detection of welding slag.

Description

Technical Field

[0001] The present invention relates to the technical field of battery safety detection, and in particular to a method, device and electronic equipment for detecting welding slag of a battery module. Background Art

[0002] With the rapid development of electric vehicle technology, electric vehicle safety accidents are also becoming more frequent. Some of these accidents are caused by impurities splashing between modules during the battery assembly process, which can cause short circuits and other safety hazards to battery use.

[0003] The current method for detecting splashed impurities (welding slag) is to perform a voltage test on the battery. However, there is no accurate data on how high the voltage can measure the thickness of the welding slag insulation layer. In other words, it is currently impossible to accurately detect splashed impurities while ensuring battery safety. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a method, device and electronic equipment for detecting welding slag of a battery module to alleviate the above-mentioned technical problem of not being able to simultaneously consider battery safety and accurate detection of welding slag.

[0005] In a first aspect, an embodiment provides a method for detecting welding slag of a battery module, the method comprising:

[0006] A simulation device is constructed for simulating a process of performing breakdown detection on welding slag of a battery module, wherein the simulation device comprises a metal rod, a first metal plate, and a second metal plate; the metal rod is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to represent parallel battery planes between the battery modules;

[0007] constructing a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod;

[0008] According to the fitting formula of the breakdown voltage critical value, the breakdown voltage of the current battery module for detecting welding slag is determined.

[0009] In an optional embodiment, the step of constructing a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module includes:

[0010] The first metal plate and the second metal plate are arranged in parallel to simulate the battery module;

[0011] The metal rods are respectively perpendicular to the first metal plate and the second metal plate and fixedly connected to the first metal plate.

[0012] In an optional embodiment, the simulation device also includes a voltage tester, the positive pole of the voltage tester is connected to the first metal plate, and the negative pole of the voltage tester is connected to the second metal plate, which is used to provide the metal rod with a preset breakdown voltage applied to the battery module.

[0013] In an optional embodiment, the step of constructing a fitting formula for the breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod includes:

[0014] Adjusting the distance between the metal rod and the second metal plate or adjusting the diameter of the metal rod to obtain different mapping combinations;

[0015] Performing a breakdown test on the second metal plate according to a preset breakdown voltage to determine the breakdown voltage critical values ​​corresponding to the different mapping combinations;

[0016] Based on the breakdown voltage critical value corresponding to each mapping combination, a breakdown voltage critical value fitting formula is constructed.

[0017] In an optional embodiment, the step of determining the breakdown voltage of the current battery module for detecting welding slag according to the fitting formula of the breakdown voltage critical value includes:

[0018] Obtaining a welding slag size standard corresponding to the current battery module, wherein the welding slag size standard includes a thickness dimension and a width dimension;

[0019] The thickness dimension and the width dimension are input into the fitting formula of the breakdown voltage critical value to determine the breakdown voltage of the current battery module.

[0020] In an optional embodiment, the distance between the metal rod and the second metal plate is used to characterize the thickness of the welding slag, and the diameter of the metal rod is used to characterize the width of the welding slag.

[0021] In an optional embodiment, the method further comprises:

[0022] The current battery module is tested according to the breakdown voltage, and the detected welding slag is removed.

[0023] In a second aspect, an embodiment provides a device for detecting welding slag of a battery module, the device comprising:

[0024] A first construction module is configured to construct a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module, wherein the simulation device comprises a metal rod, a first metal plate, and a second metal plate; the metal rod is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to represent parallel battery planes between the battery modules;

[0025] A second construction module constructs a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod;

[0026] The determination module determines the breakdown voltage of the current battery module for detecting welding slag according to the fitting formula of the breakdown voltage critical value.

[0027] In a third aspect, an embodiment provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned embodiments are implemented.

[0028] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementation methods.

[0029] An embodiment of the present invention provides a method, device and electronic device for detecting welding slag of a battery module. Based on the characteristics of welding slag detection of a battery module, two metal plates simulate the battery plane between the battery modules, and a metal rod is energized / an external current is used to simulate a preset breakdown voltage applied to the battery module to construct a simulation device; according to the distance between the metal rod and the second metal plate and the diameter of the metal rod in the simulation device, a fitting formula for the critical value of the breakdown voltage is determined, and according to the fitting formula, the breakdown voltage value required for the current battery module to accurately detect welding slag is obtained, thereby achieving accurate detection of welding slag while ensuring the safety of the battery module.

[0030] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by practicing the above-mentioned technology of the present disclosure.

[0031] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A flow chart of a method for detecting welding slag of a battery module provided by an embodiment of the present invention;

[0034] Figure 2 A schematic structural diagram of a simulation device provided by an embodiment of the present invention;

[0035] Figure 3 A functional module diagram of a welding slag detection device for a battery module provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention.

[0037] Illustration: 1-first metal plate; 2-second metal plate; 3-metal rod; 4-insulating layer. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Currently, the welding slag of battery modules is often detected by breakdown voltage. However, the inventors have found that before the battery module is tested, it is impossible to know what breakdown voltage to use for the detection operation; because if the breakdown voltage used is too small, the welding slag cannot be accurately detected; if the breakdown voltage used is too large, it will damage the devices in the battery module.

[0040] Different battery modules have different welding slag detection standards. For example, a battery module of model A is allowed to have welding slag less than 2 mm, while a battery module of model B is only allowed to have welding slag less than 1 mm, and so on.

[0041] Therefore, in order to ensure the safety of battery applications, it is necessary to conduct welding slag tests with different breakdown strengths for different types of battery modules in accordance with the standards.

[0042] Based on this, the embodiments of the present invention provide a method, device, and electronic device for detecting welding slag of a battery module, which alleviate the above-mentioned technical problem of not being able to simultaneously consider battery safety and accurate detection of welding slag.

[0043] To facilitate understanding of this embodiment, a welding slag detection method for a battery module disclosed in an embodiment of the present invention is first introduced in detail. This method can be applied to intelligent control devices such as battery management systems, battery control systems, and host computers.

[0044] Figure 1 A flow chart of a welding slag detection method for a battery module provided in an embodiment of the present invention.

[0045] like Figure 1 As shown, the method includes the following steps:

[0046] Step S102 : constructing a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module.

[0047] The simulation device includes a metal rod 3, a first metal plate 1 and a second metal plate 2; the metal rod 3 is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate 1 and the second metal plate 2 are used to represent the battery planes parallel to each other between the battery modules. Figure 2 shown.

[0048] It should be noted that the battery plane is simulated by the first metal plate 1 and the second metal plate 2, and the voltage is applied to the metal rod 3 and transmitted to the second metal plate 2. The second metal plate 2 can be understood as the battery module of the weld slag to be measured in actual applications; the simulation device can realize the simulation process of applying breakdown voltage to the battery module without the participation of the module, and determining the critical value of breakdown voltage corresponding to different weld slag sizes.

[0049] Step S104 : constructing a fitting formula for a critical breakdown voltage value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod.

[0050] Based on a plurality of mapping combinations of spacing and diameter, a fitting formula for spacing, diameter and breakdown voltage threshold is constructed. The mapping combination can be preset, and the spacing and diameter are adjusted according to the preset mapping combination.

[0051] Step S106 , determining the breakdown voltage of the current battery module for detecting welding slag according to a fitting formula of the breakdown voltage critical value.

[0052] Among them, according to the fitting formula, the breakdown voltage for welding slag detection applicable to the current battery module can be calculated.

[0053] In a preferred embodiment of practical application, based on the characteristics of battery module welding slag detection, two metal plates simulate the battery plane between the battery modules, and a metal rod is energized / external current is used to simulate the preset breakdown voltage applied to the battery module to construct a simulation device; according to the distance between the metal rod and the second metal plate and the diameter of the metal rod in the simulation device, a fitting formula for the critical value of the breakdown voltage is determined, and based on the fitting formula, the breakdown voltage value required for the current battery module to accurately detect welding slag is obtained, thereby achieving accurate detection of welding slag while ensuring the safety of the battery module.

[0054] In some embodiments, according to the characteristics of battery module welding slag detection, a simulation device capable of simulating the detection process is constructed, such as Figure 2 As shown; Based on the simulation device, a relatively simple welding slag detection is achieved without the participation of the battery module. Step S102 can be achieved by the following steps, including:

[0055] Step 1.1) The first metal plate 1 and the second metal plate 2 are arranged in parallel to simulate the battery module.

[0056] In order to obtain a more accurate welding slag detection method, the embodiment of the present invention considers the influence of the capacitance generated between battery planes on welding detection and uses two parallel metal plates to simulate the battery planes between battery modules.

[0057] Step 1.2) The metal rod 3 is respectively perpendicular to the first metal plate 1 and the second metal plate 2 and fixedly connected to the first metal plate.

[0058] The metal rod 3 can be fixedly connected to the first metal plate 1 in a cross shape through a bakelite fixture, and the distance between the metal rod 3 and the second metal plate 2 is the spacing mentioned in the above embodiment.

[0059] In practice, the metal rod 3 is replaceable. Therefore, the Bakelite fixture is detachably connected to the metal rod 3, allowing metal rods 3 of varying diameters to be secured to the first metal plate 1 using the Bakelite fixture. It should be noted that the first metal plate 1, the second metal plate 2, and the metal rod 3 can be made of the same metal material as the battery module, preferably aluminum. The dimensions of both the first metal plate 1 and the second metal plate 2 can be set to 27*148*90 mm. The second metal plate 2 also has an insulating layer 4 on its surface.

[0060] In some embodiments, the simulation device further comprises a withstand voltage tester ( Figure 2 (not shown), the voltage tester can connect its positive electrode to the first metal plate through an electric wire, and connect the negative electrode of the voltage tester to the second metal plate, so as to provide the metal rod with a preset breakdown voltage applied to the battery module.

[0061] The breakdown voltage is provided by the metal rod through the withstand voltage tester, and the second metal plate represents the battery module of the weld slag to be tested. The preset breakdown voltage can be understood as a number of pre-set voltage values. The preset breakdown voltage is combined with different spacing and diameters to detect the arc discharge point through the withstand voltage tester; for example, the preset breakdown voltage may include 2000 volts.

[0062] In some embodiments, the distance between the metal rod and the second metal plate is used to characterize the thickness of the welding slag, and the diameter of the metal rod is used to characterize the width of the welding slag.

[0063] It can be understood that based on the above characteristics, a simulation device is constructed to simulate the welding slag detection process without the participation of the battery module, so that the welding slag that meets the standard size of the battery module can be detected through a suitable breakdown voltage.

[0064] In some embodiments, a fitting formula may be constructed based on a mapping relationship between the distance between the metal rod and the second metal plate, the diameter of the metal rod, and the breakdown voltage threshold, so that a suitable welding slag detection breakdown voltage for any model of battery module can be determined based on the fitting formula. For example, step S104 may include:

[0065] Step 2.1) Adjust the distance between the metal rod and the second metal plate or adjust the diameter of the metal rod to obtain different mapping combinations.

[0066] Among them, several spacing values ​​and multiple diameter values ​​can be pre-set, and each spacing and each diameter can be mapped into corresponding combinations according to the table, and the spacing between the metal rod and the second metal plate or the diameter of the metal rod itself can be adjusted according to the mapping combination.

[0067] For example, the current spacing d between the metal rod and the second metal plate is 1, and the diameter r of the metal rod is 1; the mapping combination to be adjusted is: the spacing d between the metal rod and the second metal plate is 0.5, and the diameter r of the metal rod is 1. At this time, the metal rod needs to be moved closer to the second metal plate so that the spacing between the two is reduced to 0.5; for another example, the mapping combination to be adjusted is: the spacing d between the metal rod and the second metal plate is 1, and the diameter r of the metal rod is 2. At this time, the metal rod needs to be replaced with a metal rod with a diameter of 2 to be fixed to the first metal plate.

[0068] Step 2.2) performing a breakdown test on the second metal plate according to a preset breakdown voltage to determine the breakdown voltage critical values ​​corresponding to the different mapping combinations.

[0069] Among them, during the detection process, the arc discharge point can be detected according to the preset breakdown voltage applied to the metal rod by the voltage tester and the action of different mapping combinations. If the voltage tester queries the arc discharge point, the mapping combination parameters and the preset breakdown voltage at this time are recorded, and the preset breakdown voltage is used as the breakdown voltage critical value.

[0070] It should be noted that each preset breakdown voltage is matched with each mapping combination so that the withstand voltage tester can find the arc discharge point.

[0071] In step 2.3), a breakdown voltage critical value fitting formula is constructed based on the breakdown voltage critical value corresponding to each mapping combination.

[0072] Among them, according to the least squares method, the breakdown voltage critical value of the arc discharge point and the corresponding mapping combination are found, and a breakdown voltage critical value fitting formula is constructed. The fitting formula can characterize the corresponding breakdown voltage critical value under different mapping combination conditions (i.e., different slag size conditions).

[0073] In some embodiments, the breakdown voltage required for battery modules of different models and standards can be obtained according to the fitting formula determined in the aforementioned embodiment. That is, based on the breakdown voltage, the welding slag required by the standard can be accurately detected without using an excessively large breakdown voltage to cause damage to the battery device. For example, the aforementioned step S106 can also be implemented by the following steps, including:

[0074] Step 3.1) Obtain the welding slag size standard corresponding to the current battery module.

[0075] The welding slag size standard includes thickness and width.

[0076] Step 3.2) Input the thickness dimension and the width dimension into the fitting formula of the breakdown voltage critical value to determine the breakdown voltage of the current battery module.

[0077] At this time, the breakdown voltage matches the model standard of the current battery module, which can accurately detect the welding slag according to the size standard while ensuring the reliability of the battery device.

[0078] Step 3.3) The current battery module is tested according to the breakdown voltage, and the detected welding slag is removed.

[0079] The detected welding slag can be cleaned with corresponding cleaning force according to the size of the welding slag to avoid damaging other components of the battery.

[0080] The embodiment of the present invention can obtain the breakdown voltage required by the battery during the voltage withstand process through the above method, and can detect insulation abnormalities caused by welding slag of the battery without causing damage to the battery components.

[0081] In some embodiments, as Figure 3 As shown, an embodiment of the present invention further provides a welding slag detection device 200 for a battery module, the device comprising:

[0082] A first construction module 201 constructs a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module, wherein the simulation device comprises a metal rod, a first metal plate, and a second metal plate; the metal rod is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to represent parallel battery planes between the battery modules;

[0083] A second construction module 202 constructs a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod;

[0084] The determination module 203 determines the breakdown voltage of the current battery module for detecting welding slag according to the fitting formula of the breakdown voltage critical value.

[0085] In some embodiments, the first construction module 201 is further specifically used to arrange the first metal plate and the second metal plate in parallel to simulate the battery module; and to place the metal rod perpendicular to the first metal plate and the second metal plate respectively and fixedly connected to the first metal plate.

[0086] In some embodiments, the simulation device also includes a voltage tester, the positive pole of the voltage tester is connected to the first metal plate, and the negative pole of the voltage tester is connected to the second metal plate, which is used to provide the metal rod with a preset breakdown voltage applied to the battery module.

[0087] In some embodiments, the second construction module 202 is further specifically used to adjust the distance between the metal rod and the second metal plate or adjust the diameter of the metal rod to obtain different mapping combinations; perform breakdown detection on the second metal plate according to a preset breakdown voltage to determine the breakdown voltage critical values ​​corresponding to the different mapping combinations; and construct a breakdown voltage critical value fitting formula based on the breakdown voltage critical value corresponding to each mapping combination.

[0088] In some embodiments, the determination module 203 is further specifically used to obtain the welding slag size standard corresponding to the current battery module, wherein the welding slag size standard includes a thickness dimension and a width dimension; the thickness dimension and the width dimension are input into the fitting formula of the breakdown voltage critical value to determine the breakdown voltage of the current battery module.

[0089] In some embodiments, the distance between the metal rod and the second metal plate is used to characterize the thickness of the welding slag, and the diameter of the metal rod is used to characterize the width of the welding slag.

[0090] In some embodiments, the device further includes: a cleaning module, configured to detect the current battery module according to the breakdown voltage and to clean the detected welding slag.

[0091] Figure 4 Schematic diagram of the hardware architecture of the electronic device 300 provided in an embodiment of the present invention. Figure 4 As shown, the electronic device 300 includes a machine-readable storage medium 301 and a processor 302. It may also include a non-volatile storage medium 303, a communication interface 304, and a bus 305. The machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other via the bus 305. The processor 302 reads and executes the machine-executable instructions for battery module welding slag detection in the machine-readable storage medium 301, thereby executing the battery module welding slag detection method described in the above embodiment.

[0092] The machine-readable storage medium referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information, such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, a storage drive (such as a hard disk drive), any type of storage disk (such as a CD, DVD, etc.), or similar storage media, or a combination thereof.

[0093] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as an optical disk, a DVD, etc.), or similar non-volatile storage medium, or a combination thereof.

[0094] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0095] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the welding slag detection method for the battery module described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be repeated here.

[0096] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0097] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0098] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0099] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A method for detecting welding slag of a battery module, characterized in that: The method comprises: A simulation device is constructed for simulating a process of performing breakdown detection on welding slag of a battery module, wherein the simulation device comprises a metal rod, a first metal plate, and a second metal plate; the metal rod is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to represent parallel battery planes between the battery modules; constructing a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod; According to the fitting formula of the breakdown voltage critical value, the breakdown voltage of the current battery module for detecting welding slag is determined.

2. The method according to claim 1, characterized in that The steps of constructing a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module include: The first metal plate and the second metal plate are arranged in parallel to simulate the battery module; The metal rods are respectively perpendicular to the first metal plate and the second metal plate and fixedly connected to the first metal plate.

3. The method according to claim 2, characterized in that The simulation device also includes a withstand voltage tester, the positive pole of the withstand voltage tester is connected to the first metal plate, and the negative pole of the withstand voltage tester is connected to the second metal plate, which is used to provide the metal rod with a preset breakdown voltage applied to the battery module.

4. The method according to claim 1 or 3, characterized in that The step of constructing a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod includes: Adjusting the distance between the metal rod and the second metal plate or adjusting the diameter of the metal rod to obtain different mapping combinations; Performing a breakdown test on the second metal plate according to a preset breakdown voltage to determine the breakdown voltage critical values ​​corresponding to the different mapping combinations; Based on the breakdown voltage critical value corresponding to each mapping combination, a breakdown voltage critical value fitting formula is constructed.

5. The method according to claim 1, wherein The step of determining the breakdown voltage of the current battery module for detecting welding slag according to the fitting formula of the breakdown voltage critical value includes: Obtaining a welding slag size standard corresponding to the current battery module, wherein the welding slag size standard includes a thickness dimension and a width dimension; The thickness dimension and the width dimension are input into the fitting formula of the breakdown voltage critical value to determine the breakdown voltage of the current battery module.

6. The method according to claim 1 or 5, characterized in that The distance between the metal rod and the second metal plate is used to characterize the thickness of the welding slag, and the diameter of the metal rod is used to characterize the width of the welding slag.

7. The method according to claim 1, characterized in that The method further comprises: The current battery module is tested according to the breakdown voltage, and the detected welding slag is removed.

8. A welding slag detection device for a battery module, characterized in that: The device comprises: A first construction module is configured to construct a simulation device for simulating a process of performing breakdown detection on welding slag of a battery module, wherein the simulation device comprises a metal rod, a first metal plate, and a second metal plate; the metal rod is energized / connected to an external current to simulate a preset breakdown voltage applied to the battery module, and the first metal plate and the second metal plate are used to represent parallel battery planes between the battery modules; A second construction module constructs a fitting formula for a breakdown voltage critical value according to different mapping combinations of the distance between the metal rod and the second metal plate and the diameter of the metal rod; The determination module determines the breakdown voltage of the current battery module for detecting welding slag according to the fitting formula of the breakdown voltage critical value.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A machine-readable storage medium, characterized in that The machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method according to any one of claims 1 to 7.

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