Welding detection method, welding system and electronic equipment

Abstract

The present application provides a welding detection method, a welding system and an electronic device. The welding detection method includes obtaining first test data, the first test data being the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cell and the bus are in an electrically connected and unwelded state; obtaining second test data, the second test data being the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cell and the bus are in a welded state; if the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, a welding abnormality alarm signal is output. By analyzing the difference between the corresponding parameters in the first test data and the second test data, the changes in the electrical properties of the battery cell and the bus before and after welding can be analyzed, the welding quality of the battery cell and the bus can be accurately and comprehensively evaluated, the detection effect is better, and the factors causing substandard welding and poor battery pack quality can be more comprehensively analyzed.

Description

Technical Field

[0001] The present application relates to the technical field of welding detection, and in particular to a welding detection method, a welding system and an electronic device. Background Art

[0002] With the development of the new energy battery industry, the quality requirements for battery packs (also known as battery modules and energy storage modules) are becoming increasingly higher.

[0003] Battery packs typically contain multiple groups of cells. During their manufacture, laser welding is often required to connect multiple groups of cells in parallel or series by welding busbars to the cell terminals. After welding, the cells are then inspected to verify the quality of the battery pack. However, prior art approaches to inspecting battery pack quality suffer from poor results. Summary of the Invention

[0004] In view of the above, it is necessary to provide a welding detection method, a welding system and an electronic device to solve the problem of poor quality detection of battery packs.

[0005] In a first aspect, an embodiment of the present application provides a welding detection method, which is used to perform welding detection on a battery pack, wherein the battery pack includes battery cells and bus bars; the bus bars are fixed to the battery cell poles of adjacent battery cells by welding to achieve series or parallel connection between multiple battery cells; the welding detection method includes: obtaining first test data, wherein the first test data is the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cells and the bus bars are in an electrically connected and unwelded state; obtaining second test data, wherein the second test data is the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cells and the bus bars are in a welded state; if the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, a welding abnormality alarm signal is output.

[0006] The above design connects the cell poles of adjacent cells through a busbar, so that multiple cells are connected in series or in parallel. By testing when the cell and busbar are in an electrically connected and unwelded state, a first test data can be obtained. The first test data is the theoretical parameters of each cell and the total parameters of the battery pack after the cell and busbar are welded, which can reflect the theoretical performance status of the cell and busbar after welding. By testing when the cell and busbar are in a welded state, a second test data can be obtained. The second test data is the actual parameters of each cell and the total parameters of the battery pack after the cell and busbar are welded, which can reflect the actual performance status of the cell and busbar after welding. By analyzing the difference between the corresponding parameters in the first test data and the second test data, the changes in the performance status of the cell and busbar before and after welding can be analyzed, and the difference between the theoretical and actual performance status can be obtained. When the difference between the corresponding parameters in the first test data and the second test data is greater than the preset threshold, such as the difference between the battery cell parameters before and after welding is greater than the preset threshold or the difference between the total parameters of the battery pack before and after welding is greater than the preset threshold, it indicates that welding abnormality has occurred in the battery cell and the bus, and a welding abnormality alarm signal is output, so that the welding quality of the battery cell and the bus can be accurately and comprehensively evaluated, and the detection effect is better.

[0007] In one embodiment, the welding detection method further includes: if the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, determining the welding fault point based on the parameters whose difference is greater than the preset threshold, and outputting the welding fault point information.

[0008] In one embodiment, after the step of obtaining the first test data, the welding detection method further includes: determining whether the first test data is within a test threshold range; if so, outputting a pre-weld detection pass signal; the pre-weld detection pass signal is used to control the welding equipment to allow the operation of welding the battery cell and the bus only after receiving the pre-weld detection pass signal; if not, outputting a battery cell abnormality alarm signal.

[0009] In one embodiment, after the step of obtaining the second test data, the welding detection method further includes: if the second test data is not within the test threshold range, determining the battery cell fault point based on the parameters that are not within the test threshold range, and outputting the battery cell fault point information.

[0010] In one embodiment, the welding detection method further includes: obtaining a first height difference between the battery cell and the busbar, the first height difference being a height difference obtained by testing when the battery cell and the busbar are in an electrically connected and unwelded state; determining whether the first height difference is within a height threshold range; if so, outputting a pre-weld detection pass signal; the pre-weld detection pass signal is used to control the welding equipment to allow the operation of welding the battery cell and the busbar only after receiving the pre-weld detection pass signal; if not, outputting a height abnormality alarm signal.

[0011] In one embodiment, the welding detection method further includes: acquiring welding parameters of the battery cell and the busbar during the welding process in real time; and outputting a welding abnormality alarm signal if the welding parameters are not within a welding threshold range.

[0012] In one embodiment, if the welding parameter is not within the welding threshold range, a welding abnormality alarm signal is output, including: if the welding parameter is greater than the maximum value of the preset welding detection range, a blowout alarm message is output; if the welding parameter is less than the minimum value of the preset welding detection range, a cold weld alarm message is output.

[0013] In a second aspect, an embodiment of the present application provides a welding system, comprising a clamping device, a welding device, a sampling device and a controller; the clamping device is used to clamp the bus and the battery cell so that the battery cell and the bus are in an electrically connected and unwelded state; the welding device is used to perform the operation of welding the battery cell and the bus; the sampling device is used to sample the parameters of each battery cell and the total parameters of the battery pack and output test data; the controller is used to execute the welding detection method provided in the first aspect above.

[0014] In one embodiment, the clamping device includes a welding pressure plate and a welding pressure claw; the welding pressure claw is arranged on the welding pressure plate; the welding pressure claw is used to clamp the bus and the battery cell so that the battery cell and the bus are in an electrically connected state when not welded; the sampling device is fixed to the welding pressure plate.

[0015] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a memory for storing program instructions; and a processor for reading and executing the program instructions stored in the memory, wherein when the program instructions are executed by the processor, the electronic device executes the welding detection method provided in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a battery pack provided in an embodiment of the present application.

[0017] Figure 2 A schematic structural diagram of a testing device provided in an embodiment of the present application.

[0018] Figure 3 A schematic diagram of the functional modules of a welding system provided in an embodiment of the present application.

[0019] Figure 4 A schematic flow chart of a welding detection method provided in an embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of a first detailed flow chart of a welding detection method provided in an embodiment of the present application.

[0021] Figure 6 This is a schematic diagram of a second detailed flow chart of a welding detection method provided in an embodiment of the present application.

[0022] Figure 7 This is a schematic diagram of a third detailed flow chart of a welding detection method provided in an embodiment of the present application.

[0023] Figure 8 This is a schematic diagram of a fourth detailed flow chart of a welding detection method provided in an embodiment of the present application.

[0024] Figure 9 This is a fifth detailed flow chart of a welding detection method provided in an embodiment of the present application.

[0025] Figure 10 This is a detailed flowchart of step S902 of a welding detection method provided in an embodiment of the present application.

[0026] Figure 11 A schematic flow chart of a welding method provided in an embodiment of the present application.

[0027] Figure 12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In this application, the term "plurality" refers to two or more. In addition, it should be understood that in the description of this application, the terms "first" and "second" are used only for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0030] In the description of the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0031] With the development of the new energy battery industry, the industry's quality requirements for battery packs are becoming increasingly higher. A battery pack usually includes multiple battery cells and multiple busbars. The busbar has two ends, and the two ends of the busbar are respectively connected to the battery poles of two adjacent battery cells, so that multiple battery cells can be connected in series or in parallel. In related technologies, in the production and manufacturing of battery packs, laser welding is usually used to weld the busbar to the battery pole of the battery cell, and after the welding is completed, the battery cell and busbar are subjected to electrical performance testing to detect the welding quality. The welding quality is used to evaluate the quality of the battery pack, thereby achieving quality inspection of the battery pack.

[0032] However, the related art only tests the welding quality of battery cells and busbars after welding is completed, which is a relatively simple testing method. In addition, due to the different levels of use or wear of each battery cell and busbar after leaving the factory, the parameters of each battery cell and busbar before actual welding are not exactly the same as the parameters tested when they leave the factory. Therefore, if the quality of each battery cell and busbar is only tested after welding, there is a problem of insufficient accuracy. At the same time, when abnormal results occur, it is difficult to fully evaluate the cause of the abnormality. There are problems such as insufficient accuracy of testing and lax control of welding quality, which increases the risk of safety hazards in battery packs.

[0033] To this end, the embodiments of the present application provide a welding detection method, a welding system, and an electronic device, which utilize battery cells and buses to be tested in multiple different stages and the test results to be analyzed, thereby achieving better detection results in battery pack quality inspection and reducing production costs.

[0034] Figure 1It is a schematic diagram of the structure of a battery pack in an embodiment of the present application. The battery pack includes battery cells, a bus and a box body, wherein the battery cells and the bus are both arranged in the box body. The number of battery cells is at least 2, and two adjacent battery cells are electrically connected through a bus so that multiple battery cells can form a loop when they are in working state. The number of buses is at least 2, and the bus includes a branch bus and a main bus, wherein the branch bus is used to connect two adjacent battery cells, and the main bus is used to connect the battery cells with other circuit structures, so that the loop formed by multiple battery cells in the working state is connected to other circuit structures. Furthermore, the main bus is divided into a total positive bus and a total negative bus, and the total positive bus and the total negative bus are respectively located at the two ends of the loop.

[0035] exist Figure 1 In the corresponding embodiment, the number of battery cells is 16, including battery cell A1, battery cell A2, battery cell A3, ..., battery cell A16. The battery cells are arranged as follows: all battery cells are evenly divided into two parallel rows of battery cell groups, each row of battery cell groups consists of 8 battery cells, and the two rows of battery cell groups form a series circuit when electrically connected through each busbar.

[0036] For example, cells A1, A2, A3, ..., A8 form a row of cells, and cells A9, A10, A11, ..., A16 form a row of cells. When cells A1, A2, A3, ..., A16 are electrically connected via the busbars, they form a series circuit.

[0037] Specifically, two adjacent battery cells in each column of battery cell groups are connected via a branch bus bar.

[0038] For example, battery cell A1 and battery cell A2 are connected via a branch bus, battery cell A2 and battery cell A3 are connected via a branch bus, and so on.

[0039] In each column of battery cells, there is a battery cell located at the beginning or end of the loop, and the two battery poles of this battery cell are connected to the branch bus and the main bus respectively.

[0040] For example, cell A1 is located at the beginning of the loop. One of its poles is connected to the main busbar for connection to other circuit structures; another pole of cell A1 is connected to a branch busbar for connection to cell A2. Cell A16 is located at the end of the loop. One of its poles is connected to the main busbar for connection to other circuit structures; another pole of cell A16 is connected to a branch busbar for connection to cell A15.

[0041] In each column of battery cell groups, there is a battery cell connected to the adjacent battery cell group, and the two battery poles of this battery cell are respectively connected to two branch bus bars.

[0042] For example, if battery cell A8 is connected to battery cell A9, one of the battery poles of battery cell A8 is connected to battery cell A7 through a branch bus, and the other battery pole of battery cell A8 is connected to battery cell A9 through another branch bus; one of the battery poles of battery cell A9 is connected to battery cell A10 through a branch bus, and the other battery pole of battery cell A9 is connected to battery cell A10 through another branch bus.

[0043] It is understood that the above example is an implementation method when multiple battery cells form a series circuit. In some feasible embodiments, the circuit between multiple battery cells can also be a parallel circuit, and the arrangement relationship between the battery cells and the busbar can be adaptively adjusted. Similarly, the circuit between multiple battery cells can also be a series-parallel circuit, and the arrangement relationship between the battery cells and the busbar can also be adaptively adjusted, and the specific settings can be made according to the actual application scenario.

[0044] In addition, series circuits, parallel circuits or series-parallel circuits are common circuits in the circuit design of battery cells. Those skilled in the art can design them according to actual needs. The embodiments of this application do not elaborate on the specific connection methods or arrangements of various circuits.

[0045] In some feasible implementations, the number of battery cells can also be adjusted according to actual application requirements. Correspondingly, the arrangement of the battery cells and the number of buses can also be adaptively adjusted, which is not limited in the embodiments of the present application.

[0046] In one embodiment of the present application, there are two ways to achieve electrical connection between the busbar and the battery cell. One way is to achieve electrical connection by welding, that is, welding the busbar to the battery cell poles of the battery cell to electrically connect the busbar and the battery cell. In the finished product battery pack, the busbar is fixed to the battery cell poles of adjacent battery cells by welding to achieve series or parallel connection between the battery cells.

[0047] Another way is to achieve electrical connection by compression, specifically: place the busbar on the battery pole of the battery cell, and then use the compression device 1 to push the busbar in the direction close to the battery cell, so that the busbar and the battery cell are compressed, so that a larger contact area can be maintained between the busbar and the battery cell pole. At this time, the busbar and the battery cell are in an electrically connected and unwelded state.

[0048] Figure 2A schematic structural diagram of a test device provided in an embodiment of the present application. The test device is used to perform tests when the battery cell and the bus are in an electrically connected state. The test device includes a clamping device 1 and a sampling device 2. Among them, the sampling device 2 is composed of a test probe 21 and a tester 22, and the sampling device 2 can be divided into a first sampling mechanism and a second sampling mechanism. The first sampling mechanism and the clamping device 1 are used to perform a pre-weld test when the bus and the battery cell are in an electrically connected and unwelded state. The second sampling mechanism is used to perform a post-weld test when the bus and the battery cell are in a welded state.

[0049] During the production process of the battery pack, a first sampling mechanism can be used to perform a test before welding the battery cells and the busbars, and then a second sampling mechanism can be used to perform a test after the battery cells and the busbars are welded. The test results of the first sampling mechanism and the second sampling mechanism can be used to analyze changes in parameters such as voltage and internal resistance before and after welding the battery pack, thereby performing welding quality inspection on the battery pack.

[0050] In one embodiment of the present application, the first sampling mechanism and the second sampling mechanism can respectively use two different sampling mechanisms. In another embodiment of the present application, the first sampling mechanism and the second sampling mechanism can also use the same sampling mechanism to perform detection before and after welding respectively.

[0051] exist Figure 2 In the corresponding embodiment, the pressing device 1 is used to press the busbar and the battery cell so that the busbar and the battery cell are in an electrically connected and unwelded state, and the first sampling mechanism is used to perform a test before welding to obtain test data.

[0052] Specifically, the clamping device 1 includes a welding platen 11 and welding claws 12, which are fixed to the welding platen 11. The number and position of the welding claws 12 correspond to the number and position of the battery cell poles involved in the test. Since the connection between the busbar and the battery cell is mainly at the battery cell pole, the number and position of the welding claws 12 correspond to the number and position of the ends of the busbar connecting to the battery cell.

[0053] In addition, the welding platen 11 is further connected to a first drive mechanism, which can drive the welding platen 11 to move, so that the welding platen 11 drives each welding claw 12 to move, so that each welding claw 12 can press the busbar and the battery cell. The first drive mechanism can be a cylinder, an oil cylinder, a manipulator, etc. that can be controlled by an electrical signal to drive the welding platen 11 to move in a specified direction, and this application is not limited to this mechanism.

[0054] The first sampling mechanism includes a first probe and a first voltage internal resistance tester. The first probe is mounted and fixed to the welding pressure plate 11, with one end of the first probe facing the busbar, and the other end of the first probe is connected to the first voltage internal resistance tester via a cable. The welding pressure plate 11 has a through hole for the first probe to pass through. When the welding pressure plate 11 is moved to the position where the welding pressure claw 12 presses the busbar and battery cell, the first probe can contact the busbar for testing.

[0055] In one embodiment of the present application, the pressing direction of the welding pressure claw 12 is the vertical direction. Before the welding operation, the busbar can be placed on the upper part of the battery cell, and the welding pressure claw 12 and the first probe are located directly above each busbar. After confirming that the pre-welding test of the busbar and the battery cell has begun, the first driving mechanism drives the welding pressure plate 11 to move downward, driving each welding pressure claw 12 to move downward until each welding pressure claw 12 presses against the busbar, so that each busbar is pressed against each battery cell, and the first probe contacts the busbar, so as to be tested by the first voltage internal resistance tester.

[0056] It can be understood that the function of the clamping device 1 is to compress the busbar and battery cells before the welding operation so that the busbar and battery cells can simulate the electrical connection state after welding, allowing the first sampling mechanism to test the busbar and battery cells before welding. Therefore, the object of the clamping device 1 is associated with the test object and test data required by the first sampling mechanism.

[0057] Because the clamping object of the clamping device 1 is determined by the specific position of the welding clamping jaws 12, the number and position of the welding clamping jaws 12 can be set according to actual testing requirements. Similarly, because the test object of the first sampling mechanism is determined by the specific position of the first probes, the number and position of the first probes can be set according to actual testing requirements.

[0058] In one embodiment, the first sampling mechanism is required to test the cell parameters of all battery cells before welding, including the cell voltage and cell internal resistance. The number of first probes is consistent with the number of branch busbars, and the position of each first probe corresponds to the position of each branch busbar. The number of welding pressure claws 12 is consistent with the number of battery cell poles connected to the branch busbars, and the position of each welding pressure claw 12 corresponds to the position of each battery cell pole connected to the branch busbar.

[0059] During the actual test process, the pressing device 1 presses each battery cell and each corresponding branch bus bar, and each first probe can contact each corresponding branch bus bar to test each battery cell parameter of each battery cell.

[0060] In another feasible embodiment, the first sampling mechanism is required to test the total battery pack parameters of the battery pack before welding. The total battery pack parameters include the total battery pack voltage and the total internal resistance of the battery pack. The number of first probes is consistent with the number of total busbars, and the position of each first probe corresponds to the position of each total busbar. The number of welding pressure claws 12 is consistent with the total number of battery cell posts, and the position of each welding pressure claw 12 corresponds to the position of each battery cell post.

[0061] During the actual test process, the pressing device 1 presses each battery cell, the corresponding branch bus bars and the corresponding main bus bars, and each first probe can contact the corresponding main bus bars to test the total battery pack parameters of the battery pack.

[0062] In another feasible embodiment, the first sampling mechanism needs to test the cell parameters of all battery cells and the total battery pack parameters of the battery pack before welding. The cell parameters include cell voltage and cell internal resistance, and the total battery pack parameters include total battery pack voltage and total battery pack internal resistance.

[0063] The number of first probes is consistent with the total number of busbars, and the position of each first probe corresponds to the position of each busbar. The number of welding claws 12 is consistent with the total number of battery poles, and the position of each welding claw 12 corresponds to the position of each battery pole.

[0064] During the actual testing process, the pressing device 1 presses each battery cell, the corresponding branch bus bars and the corresponding main bus bars, and each first probe can contact the corresponding branch bus bars and the corresponding main bus bars to measure the battery cell parameters of all battery cells and the total battery pack parameters of the test battery pack.

[0065] In one embodiment of the present application, the welding platen 11 is equipped with multiple lifting mechanisms, each of which corresponds to a corresponding lifting mechanism, and the first probe is connected to the movable end of the lifting mechanism. The lifting mechanism is used to drive the corresponding first probe to rise and fall, so that the first probe is raised and lowered to different heights, thereby allowing the first probe to move to a position where it can contact the bus or not contact the bus, thereby controlling whether the first probe participates in the current test.

[0066] The user can set the height of each first probe according to actual test requirements, so as to make the specified first probe contact the corresponding bus bar in combination with the test item and test object, which is more convenient and efficient, and makes each first probe applicable to a variety of test scenarios.

[0067] In one embodiment of the present application, the clamping device 1 can not only clamp the busbar and battery cells during pre-weld testing, but also maintain the clamping of the busbar and battery cells during the welding process. The lifting mechanism can move each first probe away from the busbar during welding, reducing the risk of damage to the first probes due to high temperatures.

[0068] In one feasible embodiment, the first probe is detachably mounted on the welding platen 11, and the welding platen 11 is provided with multiple mounting positions for the first probe to be selectively mounted. The user can adjust the position of the first probe on the welding platen 11 according to actual testing requirements so that the first probe contacts a specific busbar.

[0069] In one embodiment of the present application, the second sampling mechanism includes a support plate, a second probe, and a second voltage internal resistance tester. The second probe is fixed to the support plate. One end of the second probe faces the busbar, and the other end of the second probe is connected to the second voltage internal resistance tester via a cable.

[0070] The support plate is further connected to a second drive mechanism that can drive the support plate to move. The second drive mechanism can be a cylinder, an oil cylinder, a manipulator, etc. that can be controlled by an electrical signal to drive the second probe to move in a specified direction, and this application is not limited to this.

[0071] After the busbar and the battery cell are welded, the busbar and the battery cell are in an electrically connected state. The second driving mechanism drives the support plate to move, thereby driving the second probe to move, so that the second probe can contact the busbar for testing.

[0072] Similar to the arrangement of the first probe in the above-mentioned first sampling mechanism, since the test object of the second sampling mechanism is determined by the specific position of the second probe, the number and position of the second probe can be set according to actual test requirements.

[0073] In one embodiment of the present application, the second sampling mechanism tests the cell parameters of all battery cells before welding. In order to compare with the test results before welding, the second sampling mechanism also needs to test the cell parameters of all battery cells after welding. The number of second probes is consistent with the number of branch buses, and the position of each second probe corresponds to the position of each branch bus. The number of welding pressure claws 12 is consistent with the number of battery poles connected to the branch bus, and the position of each welding pressure claw 12 corresponds to the position of each battery pole connected to the branch bus. During the actual testing process, each second probe can contact the corresponding branch bus to test the cell parameters of each battery cell.

[0074] In another feasible embodiment, the second sampling mechanism tests the total battery pack parameters of the battery pack before welding. In order to compare with the test results before welding, the second sampling mechanism also needs to test the total battery pack parameters of the battery pack after welding. The number of second probes is consistent with the number of main buses, and the position of each second probe corresponds to the position of each main bus. The number of welding pressure claws 12 is consistent with the total number of battery cell poles, and the position of each welding pressure claw 12 corresponds to the position of each battery cell pole. During the actual testing process, each second probe can contact the corresponding main bus to test the total battery pack parameters of the battery pack.

[0075] In another feasible embodiment, the second sampling mechanism tests the cell parameters of all battery cells and the total battery pack parameters of the battery pack before welding. In order to compare with the test results before welding, the second sampling mechanism also needs to test the cell parameters of all battery cells and the total battery pack parameters of the battery pack after welding.

[0076] The number of second probes is consistent with the total number of busbars, and the position of each second probe corresponds to the position of each busbar. The number of welding claws 12 is consistent with the total number of battery poles, and the position of each welding claw 12 corresponds to the position of each battery pole.

[0077] During the actual testing process, the pressing device 1 presses each battery cell, the corresponding branch bus bars and the corresponding main bus bars, and each second probe can contact the corresponding branch bus bars and the corresponding main bus bars to measure the battery cell parameters of all battery cells and the total battery pack parameters of the test battery pack.

[0078] In one embodiment of the present application, the support plate is further equipped with a plurality of lifting mechanisms, each second probe corresponding to each lifting mechanism, and the second probe is connected to the movable end of the lifting mechanism. The lifting mechanism is used to drive the corresponding second probe to rise and fall, so that the second probe is raised and lowered to different heights, thereby allowing the second probe to move to a position where it can contact the bus or not contact the bus, thereby controlling whether the second probe participates in the current test.

[0079] The user can set the height of each second probe according to actual test requirements, so as to make the designated second probe contact the corresponding bus bar in combination with the test item and test object, which is more convenient and efficient, and makes each second probe applicable to a variety of test scenarios.

[0080] In one feasible embodiment, the second probe is detachably mounted on a support plate, and the support plate is provided with a plurality of mounting positions for the second probe to be selectively mounted. The user can adjust the position of the second probe on the support plate according to actual testing requirements so that the second probe contacts a specific bus bar.

[0081] During the actual testing process, the first sampling mechanism and the second sampling mechanism are used to allow the busbar and the battery cell to first undergo compression and pre-welding testing. After the busbar and the battery cell are welded, the busbar and the battery cell are then subjected to post-welding testing. By comparing and analyzing the test results of the pre-welding test and the post-welding test, a more complete evaluation of the welding quality of the battery pack can be performed.

[0082] In one embodiment, the first drive mechanism also has the function of driving the welding platen 11 to move horizontally, and the second drive mechanism also has the function of driving the support plate to move horizontally. Before the pre-weld test begins, the first drive mechanism can drive the welding platen 11 to move directly above the battery cell and busbar; during the pre-weld test, the first drive mechanism can drive the welding platen 11 to move downward to press the battery cell and busbar and perform the test; during the welding process, the pressing device 1 keeps pressing the battery cell and busbar; after the welding is completed and before the post-weld test begins, the first drive mechanism can drive the welding platen 11 away from directly above the battery cell and busbar, and the second drive mechanism drives the support plate to move directly above the battery cell and busbar; during the post-weld test, the second drive mechanism can drive the second probe to move downward to press the battery cell and busbar and perform the test.

[0083] In the above embodiment, the testing device compresses the busbar and performs a pre-weld test through the first sampling mechanism, and performs a post-weld test through the second sampling mechanism.

[0084] In a feasible implementation manner in which the first sampling mechanism and the second sampling mechanism adopt the same set of sampling mechanisms, each welding pressure claw 12 is movably installed on the welding pressure plate 11, and the welding pressure plate 11 is provided with a movable mechanism for driving each welding pressure claw 12 to move, so as to realize the automatic disassembly and assembly of each welding pressure claw 12. The movable mechanism can be a driving cylinder, a manipulator, etc.

[0085] The first and second sampling mechanisms can share a test probe 21 and tester 22. Before pre-weld testing, the movable mechanism forces each welding clamp 12 to a designated position on the welding platen 11, thereby clamping the busbar at that designated position. The test probe 21 forms the first probe for pre-weld testing. Before post-weld testing, the movable mechanism forces each welding clamp 12 away from the welding platen 11, and the test probe 21 forms the second probe for post-weld testing.

[0086] Figure 3This is a schematic diagram of the functional modules of a welding system provided in an embodiment of the present application. The welding system includes a testing device, namely, a clamping device 1 and a sampling device 2. The welding system also includes a welding device 3 and a controller 4. The clamping device 1, sampling device 2, and welding device 3 are all electrically connected to the controller 4, and the clamping device 1, sampling device 2, and welding device 3 are all controlled by electrical signals from the controller 4 to operate.

[0087] The pressing device 1 is used to press the busbar and battery cells so that they are electrically connected and unwelded. The welding device 3 is used to perform welding operations on the battery cells and busbars. The sampling device 2 is used to sample the parameters of each battery cell and the overall parameters of the battery pack and output test data. The sampling device 2 in this embodiment includes a first sampling mechanism and a second sampling mechanism. The first sampling mechanism is used to perform pre-weld testing to obtain first test data, and the second sampling mechanism is used to perform post-weld testing to obtain second test data.

[0088] It is understood that the first test data can reflect the theoretical performance of the battery cell and busbar after welding, and the second test data can reflect the actual performance of the battery cell and busbar after welding. By analyzing the corresponding parameters in the first test data and the second test data, the embodiment of the present application can analyze the changes in the performance of the battery cell and busbar before and after welding, and obtain the difference between the theoretical and actual performance states.

[0089] When the difference between the corresponding parameters in the first test data and the second test data is greater than the preset threshold, it indicates that a welding abnormality has occurred in the battery cell and the busbar, and a welding abnormality alarm signal is output, thereby enabling an accurate and comprehensive evaluation of the welding quality of the battery cell and the busbar, resulting in better detection results.

[0090] For example, the corresponding parameters in the first test data and the second test data can be the battery cell voltage. The battery cell voltage in the first test data can evaluate the theoretical safety performance of the battery cell after welding, and the battery cell voltage in the second test data can evaluate the actual safety performance of the battery cell after welding. The difference in battery cell voltage before and after welding can reflect the difference between the theoretical and actual safety performance of the battery cell. When the difference is greater than the preset threshold, it indicates that abnormal welding has occurred between the battery cell and the bus.

[0091] For another example, the corresponding parameters in the first test data and the second test data can also be the internal resistance of the battery cell. The battery cell voltage in the first test data can evaluate the theoretical discharge performance of the battery cell after welding, and the battery cell voltage in the second test data can evaluate the actual discharge performance of the battery cell after welding. The difference in battery cell voltage before and after welding can reflect the difference between the theoretical and actual discharge performance of the battery cell. When the difference is greater than the preset threshold, it indicates that abnormal welding has occurred between the battery cell and the bus.

[0092] For another example, the corresponding parameters in the first test data and the second test data may be the total voltage of the battery pack. The total voltage of the battery pack in the first test data can evaluate the theoretical safety performance of the battery pack after welding, and the total voltage of the battery pack in the second test data can evaluate the actual safety performance of the battery pack after welding. The difference in the total voltage of the battery pack before and after welding can reflect the difference between the theoretical and actual safety performance of the battery pack. When the difference is greater than the preset threshold, it indicates that welding abnormality has occurred between the battery cell and the bus.

[0093] For another example, the corresponding parameters in the first test data and the second test data can also be the total internal resistance of the battery pack. The total internal resistance of the battery pack in the first test data can evaluate the theoretical discharge performance of the battery pack after welding, and the total internal resistance of the battery pack in the second test data can evaluate the actual discharge performance of the battery pack after welding. The difference in the total internal resistance of the battery pack before and after welding can reflect the difference between the theoretical and actual discharge performance of the battery pack. When the difference is greater than the preset threshold, it indicates that there is a welding abnormality between the battery cell and the bus.

[0094] If welding quality fails to meet standards, the first and second test data are used to analyze and compare the conditions before and after welding. This allows for a more comprehensive analysis of the factors contributing to the substandard welding and poor battery pack quality. For example, if the first test data passes but the second test data fails, it may be that an anomaly occurred during the welding process of the battery cell or busbar.

[0095] Figure 4 The figure is a flow chart of a welding detection method provided in an embodiment of the present application. The welding detection method can be executed by the controller 4 of the welding system, and the welding detection method includes the following steps.

[0096] S401: Obtain first test data.

[0097] The first test data are the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cell and the busbar are in an electrically connected and unwelded state.

[0098] See also Figure 2 and Figure 4 Specifically, before acquiring the first test data, controller 4 controls pressing device 1 to press downward, thereby pressing the battery cell and busbar to ensure they are electrically connected but not welded. Controller 4 then controls the first sampling mechanism to perform a test to obtain parameters for each battery cell and the overall battery pack parameters.

[0099] The parameters of each battery cell and the overall parameters of the battery pack can reflect whether the contact between the battery cell and the bus is good.

[0100] In one embodiment of the present application, each cell parameter includes cell voltage and cell internal resistance, and the overall battery pack parameter includes battery pack total voltage and battery pack total internal resistance. The cell parameters are measured by contacting the sub-bus with the test probe 21 of the first sampling mechanism, and the overall battery pack parameter is measured by contacting the main bus with the test probe 21 of the first sampling mechanism.

[0101] S402: Obtain second test data.

[0102] The second test data are the parameters of each battery cell and the total parameters of the battery pack obtained by testing when the battery cell and the busbar are in a welded state.

[0103] Specifically, after the battery cell and busbar are welded and before obtaining the second test data, the controller 4 controls the pressing device 1 to rise and move the pressing device 1 away from the busbar. The controller 4 then controls the second sampling mechanism to perform a test to obtain the parameters of each battery cell and the overall parameters of the battery pack.

[0104] In one embodiment of the present application, the parameters of each battery cell include the battery cell voltage and the battery cell internal resistance, and the total battery pack parameters include the battery pack total voltage and the battery pack total internal resistance. The parameters of each battery cell are obtained by testing the sub-buses with the test probe 21 of the second sampling mechanism, and the total battery pack parameters are obtained by testing the main bus with the test probe 21 of the second sampling mechanism.

[0105] In subsequent steps of this embodiment, the second test data and the first test data may be compared and analyzed. To this end, the second test data and the first test data have the same electrical performance parameters.

[0106] For example, the cell voltage in the second test data is compared with the cell voltage in the first test data; the cell internal resistance in the second test data is compared with the cell internal resistance in the first test data; the total battery pack voltage in the second test data is compared with the total battery pack voltage in the first test data; and the total battery pack internal resistance in the second test data is compared with the total battery pack internal resistance in the first test data. However, the specific parameter values ​​of the electrical performance parameters in the second test data and the first test data can be different, so as to compare the changes in electrical performance before and after welding.

[0107] In this embodiment, the first test data and the second test data can be obtained by simply contacting the busbar with the test probe 21, which is efficient and convenient, effectively improving the test efficiency. In some feasible embodiments, the user can also test different electrical performance parameters as test data according to actual requirements, and this application is not limited to this.

[0108] It can be understood that the parameters of each battery cell and the total parameters of the battery pack are parameters that can reflect the quality of the battery and the quality of the welding. In the above example, the first test data and the second test data both include the battery cell voltage, the battery cell internal resistance, the total voltage of the battery pack and the total internal resistance of the battery pack. In some embodiments, the first test data and the second test data may actually include one or more of the battery cell voltage, the battery cell internal resistance, the total voltage of the battery pack and the total internal resistance of the battery pack, or may also include other electrical performance parameters, which may be determined according to the type of test performed on the battery pack in actual operation, as long as it can achieve the effect of reflecting the quality of the battery and the welding quality.

[0109] On the other hand, since the first test data and the second test data need to be compared to reflect the changes in the battery cells and busbars before and after the simulated welding, the parameter types of the first test data and the parameter types of the second test data need to correspond one-to-one. In some embodiments, the parameter types of the first test data and the second test data may also differ. As long as the parameters of the same parameter type in the first test data and the second test data are compared one-to-one to achieve the effect of reflecting the changes in the battery cells and busbars before and after the simulated welding, the parameters that differ can be used for separate analysis.

[0110] S403: Determine whether the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold. If so, execute step S404.

[0111] Among them, the above-mentioned corresponding parameters refer to the electrical performance parameters that can be analyzed and compared in the first test data and the second test data, that is, the parameters of each battery cell in the first test data are analyzed and compared with the parameters of each battery cell in the second test data, and the total parameters of the battery pack in the first test data are analyzed and compared with the total parameters of each battery pack in the second test data.

[0112] Each electrical performance parameter included in the analysis and comparison has a preset threshold. This threshold can be a system default or an empirical value set by the administrator. The preset threshold can be calibrated based on pre-collected busbar impedance, contact impedance between the busbar and the cell, and the cell material.

[0113] In one embodiment of the present application, a specific method for determining whether the difference between corresponding parameters in the first test data and the second test data is greater than a preset threshold is as follows:

[0114] Determine whether the difference between the battery cell voltage in the first test data and the battery cell voltage in the second test data is greater than the corresponding preset threshold; and, determine whether the difference between the battery cell internal resistance in the first test data and the battery cell internal resistance in the second test data is greater than the corresponding preset threshold; and, determine whether the difference between the battery pack total voltage in the first test data and the battery pack total voltage in the second test data is greater than the corresponding preset threshold; and, determine whether the difference between the battery pack total internal resistance in the first test data and the battery pack total internal resistance in the second test data is greater than the corresponding preset threshold.

[0115] When the difference in any of the above judgments is greater than the corresponding preset threshold, a welding abnormality alarm signal is output.

[0116] S404: Output a welding abnormality alarm signal.

[0117] If the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, it indicates that welding abnormality occurs between the current battery cell and the busbar, and a welding abnormality alarm signal is output.

[0118] The embodiment of the present application utilizes the first test data obtained when the battery cells and busbars are electrically connected and not welded. The first test data are the theoretical parameters of each battery cell and the total parameters of the battery pack after welding is completed, and can reflect the actual performance and status of the battery cells and busbars before welding.

[0119] The second test data is obtained by testing when the battery cells and busbars are in a welded state. The second test data is actually the parameters of each battery cell and the total parameters of the battery pack after the welding of the battery cells and busbars is completed, and can reflect the actual performance and status of the battery cells and busbars after welding.

[0120] It can be understood that by obtaining the first and second test data, the actual state and performance of the battery cells and busbars before and after welding can be reflected, and the test results are more accurate. In addition, by analyzing the difference between the corresponding parameters in the first and second test data, the changes in the electrical performance of the battery cells and busbars before and after welding can be analyzed. When the difference between the corresponding parameters in the first and second test data is greater than a preset threshold, it indicates that a welding anomaly has occurred in the battery cells and busbars, and a welding anomaly alarm signal is output, thereby enabling an accurate and comprehensive assessment of the welding quality of the battery cells and busbars.

[0121] Specifically, when welding quality does not meet standards, if only a single post-welding test is performed, when test data abnormalities occur, it is impossible to determine whether the abnormality is caused by welding, the components themselves, or installation. At this time, if analysis is performed based on the initial parameters of the battery cells and buses tested at the factory, it will be impossible to determine whether the battery cells or buses are affected by the degree of use or wear, resulting in an inability to accurately analyze the cause.

[0122] In the embodiment of the present application, the conditions before and after welding are analyzed and compared through the first test data and the second test data, so that the factors causing substandard welding and poor quality of the battery pack can be analyzed more comprehensively, thereby accurately and comprehensively evaluating the welding quality of the battery cells and busbars, and achieving better detection results.

[0123] Especially in parallel circuits, when individual battery cells are installed upside down, ordinary tests are difficult to directly detect the abnormality. However, by comparing the total voltage of the battery pack before and after welding, it is possible to determine whether the battery cells are installed upside down by judging whether the power loss is serious. Timely detection can reduce safety risks and ensure the quality and safety of the battery pack.

[0124] In one embodiment of the present application, the welding abnormality alarm signal includes electrical performance parameters corresponding to a difference greater than a preset threshold.

[0125] For example, if the difference between the cell voltage in the first test data and the cell voltage in the second test data is greater than a corresponding preset threshold, or if the difference between the cell internal resistance in the first test data and the cell internal resistance in the second test data is greater than a preset threshold, the welding abnormality alarm signal includes the cell parameters corresponding to the difference. Based on the welding abnormality alarm signal, it can be determined that the battery cells in the battery pack have welding errors or circuit breaks, and management personnel can investigate the cells.

[0126] For example, if the difference between the total battery pack voltage in the first test data and the total battery pack voltage in the second test data is greater than a corresponding preset threshold, or if the difference between the total battery pack internal resistance in the first test data and the total battery pack internal resistance in the second test data is greater than a preset threshold, the welding abnormality alarm signal includes the total battery pack parameter corresponding to the difference. Based on the welding abnormality alarm signal, it can be determined whether the battery cells in the battery pack are installed upside down. Upside-down cells will cause the battery pack to lose power faster, allowing management personnel to promptly check each cell.

[0127] In one embodiment of the present application, the welding system may include a warning module. A welding anomaly warning signal may be sent to the warning module, which triggers an alarm action to alert management personnel to promptly address the battery cells and busbars. The alarm action may include an audible or visual alarm, or the sending of an alarm email or text message to a remote terminal.

[0128] In one embodiment of the present application, the welding system may include a display module. A welding abnormality alarm signal may be sent to the display module, which then displays corresponding alarm content based on the welding abnormality alarm signal. The alarm content may include the value of the first test data, the value of the second test data, the location of the battery cell, the location of the busbar, and the comparison result of the first test data and the second test data, so as to alert management personnel to promptly check.

[0129] In one embodiment of the present application, in step S403, if the difference between the corresponding parameters in the first test data and the second test data is less than or equal to a preset threshold, detection qualification information is output.

[0130] The qualified detection information is used to instruct the welding system to proceed to the next step.

[0131] It can be understood that if the difference between the corresponding parameters in the first test data and the second test data is less than or equal to the preset threshold, it means that the first test data and the second test data are normal, and the current battery cell and bus connection are qualified.

[0132] The detection qualification information can be sent to the display module, and the display module displays the corresponding qualified content according to the detection qualification information. The alarm content may include the value of the first test data, the value of the second test data, the position of the battery cell, the position of the bus, and the comparison results between the first test data and the second test data, etc.

[0133] In one embodiment of the present application, in step S404, the method further includes: determining a welding fault point according to parameters whose difference is greater than a preset threshold, and outputting welding fault point information.

[0134] Parameters with a difference greater than a preset threshold refer to cell voltages or internal resistances with a difference greater than the preset threshold. The corresponding cell and busbar are abnormal. Welding fault point information indicates the location of the abnormal cell and busbar, facilitating prompt troubleshooting by management personnel.

[0135] In one embodiment of the present application, the welding fault point information is sent to a display module to display the location of the corresponding fault point, or the welding fault point information is sent to a remote terminal held by a manager to promptly remind the manager.

[0136] Specifically, when the difference between the cell voltage in the first test data and the cell voltage in the second test data is greater than the corresponding preset threshold, the cell and bus corresponding to the cell voltage are regarded as welding fault points, and welding fault point information is output for the cell and bus.

[0137] Alternatively, when the difference between the battery cell internal resistance in the first test data and the battery cell internal resistance in the second test data is greater than the corresponding preset threshold, the battery cell and bus corresponding to the battery cell internal resistance are regarded as welding fault points, and welding fault point information is output for the battery cell and bus.

[0138] In one embodiment of the present application, all cells and all buses in the battery pack are marked with corresponding numbers. The cell or bus number can be used to distinguish the location of the cell or bus. Each set of test data obtained from the cell or bus test carries the corresponding cell or bus number, so that the specific cell or bus location can be determined by the number.

[0139] When the difference between the corresponding parameters in the first test data and the second test data is less than or equal to the preset threshold, it means that the changes in the battery cells and the bus before and after welding are within a reasonable fluctuation range. At present, there are no welding failure points in each battery cell and each bus, and therefore the basic conditions for the welding equipment 3 to perform subsequent welding operations are met.

[0140] In one embodiment of the present application, the first test data and the second test data of the battery pack are both recorded and saved to provide a reference for subsequent performance parameters of the battery pack.

[0141] In the embodiment of the present application, when the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, the difference is used to determine the welding fault point where the welding abnormality has occurred, and the corresponding welding fault point information is output, so as to facilitate timely repair of the welding fault point and elimination of the abnormality to ensure battery quality.

[0142] See also Figure 5 In one embodiment of the present application, after step S401 and before welding the battery cell and the busbar, the welding detection method further includes the following steps:

[0143] S501 , determining whether the first test data is within a pre-welding threshold range, if not, executing step S502 ; if yes, executing step S503 .

[0144] The pre-weld threshold range is a preset threshold value for the corresponding parameter in the first test data under normal conditions. This threshold value can be a system default value or an empirical value set by the administrator. One or more pre-weld threshold ranges are set corresponding to one or more of the cell voltage, cell internal resistance, battery pack total voltage, and battery pack total internal resistance included in the first test data.

[0145] In one embodiment of the present application, a specific method for determining whether the first test data is within the pre-welding threshold range is as follows: determining whether the battery cell voltage in the first test data is within the corresponding pre-welding threshold range; and, determining whether the battery cell internal resistance in the first test data is within the corresponding pre-welding threshold range; and, determining whether the battery pack total voltage in the first test data is within the corresponding pre-welding threshold range; and, determining whether the battery pack total internal resistance in the first test data is within the corresponding pre-welding threshold range.

[0146] When the value of any of the above judgments is out of the corresponding pre-welding threshold range, a pre-welding abnormality alarm signal is output.

[0147] S502: Outputting a pre-welding abnormality alarm signal.

[0148] Among them, if the first test data is not within the test threshold range, it means that the battery cells and buses currently participating in the test may have abnormalities or poor contact, and timely troubleshooting is required.

[0149] The pre-welding abnormality alarm signal is used to be sent to the warning module and the display module. The warning module triggers the alarm action, and the display module displays the corresponding pre-welding abnormality alarm screen to alert the management personnel to deal with the battery cells and buses in time.

[0150] In one embodiment of the present application, step S502, i.e., outputting a pre-welding abnormality alarm signal, further includes the following steps:

[0151] The pre-weld fault point is determined based on the parameters that are not within the pre-weld threshold range, and the pre-weld fault point information is output.

[0152] Parameters outside the test threshold range refer to cell voltage or internal resistance. These parameters indicate abnormalities in the cell and busbar. Pre-weld fault point information indicates the location of the abnormal cell, facilitating prompt troubleshooting by management personnel.

[0153] In one embodiment of the present application, the fault point information before welding is sent to the display screen of the welding system to display the location of the corresponding fault point, or the battery cell fault point information is sent to a remote terminal held by a manager to remind the manager in time.

[0154] Specifically, when the cell voltage in the first test data is not within the test threshold range, the cell corresponding to the cell voltage is used as a pre-welding fault point, and pre-welding fault point information is output for the cell.

[0155] Alternatively, when the internal resistance of the battery cell in the first test data is not within the test threshold range, the battery cell corresponding to the internal resistance of the battery cell is used as a pre-welding fault point, and pre-welding fault point information is output for the battery cell.

[0156] S503: Output a pre-welding inspection pass signal.

[0157] See also Figure 3 , wherein the welding detection pass signal is used to control the welding equipment 3 to allow the operation of welding the battery cell and the busbar only after receiving the pre-weld detection pass signal.

[0158] When the difference between the corresponding parameters in the first test data and the second test data is less than or equal to the preset threshold, and the second test data is within the test threshold range, the battery cells and buses involved in the test can participate in subsequent welding operations.

[0159] It can be understood that after outputting the pre-welding abnormality alarm signal, the welding device 3 will suspend subsequent welding operations to prevent the abnormal battery cells and busbars from being welded.

[0160] The embodiment of the present application determines whether there are any abnormalities in the battery cells and busbars that are electrically connected but not welded by analyzing whether the first test data is within the test threshold range. If there are no abnormalities in the battery cells and busbars that are electrically connected but not welded, a pre-weld test pass signal is output, so that the welding device 3 can subsequently perform welding operations on the battery cells and busbars. If there are abnormalities in the battery cells and busbars that are electrically connected but not welded, a battery cell abnormality alarm signal is output, so that abnormal defective battery cells can be inspected and eliminated in a timely manner, reducing resource waste caused by the participation of defective battery cells in welding and reducing raw material loss caused by abnormalities discovered after welding, thereby lowering production costs.

[0161] See also Figure 6 In one embodiment of the present application, after step S402, that is, after obtaining the second test data, the welding detection method further includes the following steps:

[0162] S601, determine whether the second test data is within the test threshold range, if not, execute step S602; if yes, end.

[0163] The test threshold range is a preset threshold value for the corresponding parameter in the second test data under normal conditions. The threshold value can be a system default value or an empirical value set by the administrator. Corresponding to one or more of the cell voltage, cell internal resistance, battery pack total voltage, and battery pack total internal resistance included in the second test data, the test threshold range is also set to one or more corresponding values.

[0164] In one embodiment of the present application, the specific method of determining whether the second test data is within the test threshold range is: determining whether the battery cell voltage in the second test data is within the corresponding test threshold range; and, determining whether the battery cell internal resistance in the second test data is within the corresponding test threshold range; and, determining whether the total battery pack voltage in the second test data is within the corresponding test threshold range; and, determining whether the total battery pack internal resistance in the second test data is within the corresponding test threshold range.

[0165] When the value of any of the above judgments is out of the corresponding test threshold range, a battery cell abnormality alarm signal is output.

[0166] S602: Output a battery cell abnormality alarm signal.

[0167] Among them, if the second test data is not within the test threshold range, it means that the battery cells and buses currently participating in the test may have abnormalities, such as the battery cells and buses are not pressed tightly together, the battery cells themselves are faulty, the battery cells are installed upside down, the bus is abnormal, etc., and timely troubleshooting is required.

[0168] The battery cell abnormality alarm signal is used to be sent to the warning module and the display module. The warning module triggers the alarm action, and the display module displays the corresponding battery cell abnormality alarm screen to alert the management personnel to deal with the battery cells and buses in time.

[0169] In one embodiment of the present application, step S602, i.e., outputting a cell abnormality alarm signal, further includes the following steps:

[0170] The battery cell fault point is determined based on the parameters that are not within the test threshold range, and the battery cell fault point information is output.

[0171] Parameters outside the test threshold range refer to cell voltage or cell internal resistance. The corresponding cell and busbar are abnormal. Cell fault point information indicates the location of the abnormal cell, facilitating prompt troubleshooting by management personnel.

[0172] In one embodiment of the present application, the cell fault point information is sent to a display screen of a welding system to display the location of the corresponding fault point, or the cell fault point information is sent to a remote terminal held by a manager to promptly remind the manager.

[0173] Specifically, when the cell voltage in the second test data is not within the test threshold range, the cell corresponding to the cell voltage is used as a cell fault point, and cell fault point information is output for the cell.

[0174] Alternatively, when the battery cell internal resistance in the second test data is not within the test threshold range, the battery cell corresponding to the battery cell internal resistance is used as the battery cell fault point, and the battery cell fault point information is output for the battery cell.

[0175] The embodiment of the present application determines whether there is an abnormal cell failure point in the battery pack by analyzing whether the second test data is within the test threshold range, and outputs the cell failure point information so as to promptly check the abnormal situation and reduce the safety risks of the battery pack.

[0176] See also Figure 1 and Figure 2 In one embodiment of the present application, each battery cell and each bus bar in the battery pack are compressed and tested, while in another embodiment of the present application, the battery pack can also select corresponding battery cells and buses for compression and testing according to the circuit formed by each battery cell and each bus bar in the battery pack, such as a series circuit, a parallel circuit or a series-parallel circuit.

[0177] For example, when the battery cells of a battery pack are connected in series, the compression method requires that all busbars and all battery cells in the battery pack be compressed simultaneously. The testing method involves testing each compressed battery cell and busbar using each test probe 21 to obtain first test data and second test data. Furthermore, in a series circuit, the overall battery pack parameters in the first and second test data are required parameters, while individual battery cell parameters can be tested selectively.

[0178] For another example, when the cells of a battery pack are connected in parallel, the overall parallel circuit can be considered as multiple parallel series circuits. The compression method is to compress the busbars and cells that form one of the series circuits in the battery pack simultaneously. The testing method is to test the compressed cells and busbars using various test probes 21 to obtain first test data and second test data. Furthermore, in the parallel circuit, the cell parameters in the first and second test data are required parameters, while the overall battery pack parameters can be tested selectively.

[0179] For another example, when the battery cells of the battery pack are a series circuit combined with a parallel circuit, the battery cells and bus bars of the series part and the battery cells and bus bars of the parallel part are respectively compressed by the above-mentioned compacting method, and at the same time, the battery cells and bus bars of the series part and the battery cells and bus bars of the parallel part are respectively tested by the above-mentioned testing method.

[0180] It can be understood that the above tests are conducted on the battery cells and busbars before and after welding, and the test results are compared and analyzed.

[0181] See also Figure 7In one embodiment of the present application, after the welding of each battery cell and each busbar is completed, the welding detection method further includes the following steps:

[0182] S701. Obtain impedance test data.

[0183] The impedance test data is the DC impedance data obtained by performing an impedance test on the welding point between the battery cell and the busbar after the battery cell and the busbar are welded.

[0184] Specifically, the welding system also includes an impedance testing device, which includes an impedance testing probe and an impedance tester. Each impedance testing probe is installed on the welding pressure plate 11, and each impedance testing probe is electrically connected to the impedance tester. The number of impedance testing probes is consistent with the number of battery poles of the battery cell. The impedance testing probes are grouped in two, and a group of impedance testing probes corresponds to one battery cell. One of the impedance testing probes in a group of impedance testing probes is used to contact the battery pole of the corresponding battery cell, and the other impedance testing probe is used to contact the bus corresponding to the battery pole, thereby testing the impedance of the welding point between the battery pole and the bus.

[0185] S702: Determine whether the impedance test data is within the impedance threshold range. If not, execute step S703; if yes, end.

[0186] The impedance threshold range is the impedance range of the welding of the battery cell and the busbar under normal conditions. The impedance range may be a system default value or an empirical value set by a management personnel.

[0187] S703: Output impedance abnormality warning signal.

[0188] If the impedance test data is not within the impedance threshold range, it means that the battery cells and buses currently participating in the test have abnormalities such as cold soldering or desoldering, and timely troubleshooting is required.

[0189] The impedance abnormality warning signal is used to be sent to the warning module and the display module. The warning module triggers the alarm action, and the display module displays the corresponding impedance abnormality warning screen to alert the management personnel to deal with the battery cells and buses in time.

[0190] The embodiment of the present application utilizes impedance analysis on the welding points of the battery cells and the busbars after welding to detect whether the welding of the battery cells and the busbars meets the standards, thereby reducing safety risks.

[0191] See also Figure 8 In one embodiment of the present application, before welding each battery cell and each busbar, the welding detection method further includes the following steps:

[0192] S801: Obtain a first height difference between the battery cell and the busbar.

[0193] The first height difference is a height difference obtained by testing when the battery cell and the busbar are in an electrically connected and unwelded state, and at this time, the battery cell and the busbar are in a compressed state.

[0194] Specifically, the welding system also includes a camera and an image processing module. The camera is used to capture a test image of the battery cell and busbar when they are electrically connected but not welded, and transmit the test image to the image processing module. The test image captures both the battery cell and the corresponding busbar, allowing for clear analysis of the height difference between the battery cell and the corresponding busbar.

[0195] In one embodiment of the present application, the welding system is equipped with multiple cameras to expand the field of view and capture all battery cells and busbars. The image processing module is configured to identify the battery cells and busbars in the test image using a built-in algorithm and calculate a first height difference between the battery cells and busbars.

[0196] S802: Determine whether the first height difference is within a height threshold range. If not, execute step S803; if so, execute step S804.

[0197] The height threshold range is the height difference range between the battery cell and the busbar under normal conditions. The height difference range can be a system default value or an experience value set by the administrator.

[0198] S803: Output an abnormal altitude warning signal.

[0199] If the first height difference is not within the height threshold range, it means that the height difference between the battery cell currently being tested and the busbar is abnormal. Continuing the welding operation may result in welding errors, and timely troubleshooting is required.

[0200] The high abnormality alarm signal is used to be sent to the warning module and the display module. The warning module triggers the alarm action, and the display module displays the corresponding high abnormality alarm screen to alert the management personnel to deal with the battery cells and buses in time.

[0201] S804: Output a pre-welding inspection pass signal.

[0202] The welding detection pass signal is used to control the welding device 3 to allow the operation of welding the battery cell and the busbar only after receiving the pre-weld detection pass signal.

[0203] The embodiment of the present application determines whether there is poor contact between the unwelded battery cell and the busbar by detecting the first height difference between the battery cell and the busbar and analyzing whether the first height difference is within a height threshold range. If the first height difference is within the height threshold range, a pre-weld detection pass signal is output, allowing the welding equipment to subsequently perform welding operations on the battery cell and busbar. If the first height difference is not within the height threshold range, a height abnormality alarm signal is output to promptly inspect and eliminate abnormal defective battery cells, thereby reducing the waste of resources caused by the participation of defective battery cells in welding.

[0204] In one embodiment of the present application, the pre-weld inspection pass signal includes the first pre-weld inspection pass signal output in step S503 and the second pre-weld inspection pass signal output in step S804 .

[0205] It can be understood that the first pre-weld detection signal is used to determine whether the first test data of the battery cell and the bus bar meets the standard, and the second pre-weld detection signal is used to determine whether the first height difference of the battery cell and the bus bar meets the standard. After the above two conditions are met, the battery cell and the bus bar can proceed to the next welding operation, reducing the risk of cold welding during the welding process, reducing production waste, and improving production quality.

[0206] See also Figure 9 In one embodiment of the present application, during the welding process of each battery cell and each busbar, the welding detection method further includes the following steps:

[0207] S901. Real-time acquisition of welding parameters of the battery cell and busbar during the welding process.

[0208] Welding parameters are test data collected by the sensor module during the welding of battery cells and busbars. Welding parameters are used to reflect the stability of the physical reaction of the welding material during the high-temperature melting process.

[0209] S902: If the welding parameters are not within the welding threshold range, output a welding abnormality alarm signal.

[0210] The welding threshold range is a preset threshold value corresponding to the welding parameters under normal conditions. The threshold value can be a system default value or an experience value set by the management personnel.

[0211] When the welding parameters are not within the welding threshold range, it means that there is an abnormality in the welding process of the battery cell and busbar, and it is necessary to suspend welding and perform troubleshooting in time.

[0212] The welding abnormality alarm signal is used to be sent to the warning module and the display module. The warning module triggers the alarm action, and the display module displays the corresponding welding abnormality alarm screen to alert the management personnel to deal with the battery cells and buses in time.

[0213] Specifically, step S902 may be: determining whether the welding parameters are within the welding threshold range, and if not, outputting a welding abnormality alarm signal; if so, outputting a welding normal signal, which is used to be sent to a display module, and the display module displays a corresponding welding normal screen.

[0214] The embodiment of the present application obtains welding parameters in real time through the sensor module to monitor the welding status of the battery cells and busbars during the welding process, and analyzes whether welding errors will occur in the battery cells and busbars during the welding process, thereby ensuring the welding quality of the battery cells and busbars.

[0215] In one embodiment of the present application, the sensor module may include one or more of a temperature measurement module and a photoelectric module.

[0216] In one embodiment, the sensor module includes a temperature measurement module, and the welding parameter includes a welding temperature, which is the temperature of the busbar surface. Accordingly, the embodiment of step S901 may include: obtaining the welding temperature of the weld between the battery cell and the busbar in real time through the temperature measurement module.

[0217] In one embodiment, the sensor module includes a photoelectric module, and the welding parameter includes welding brightness, which is the brightness of the busbar surface. Accordingly, an embodiment of step S901 may include: obtaining the welding brightness of the weld between the battery cell and the busbar in real time using the photoelectric module.

[0218] It is understood that the above embodiments may be combined with one another. For example, if the sensor module includes a temperature measurement module and a photoelectric module, and the welding parameters include welding temperature and welding brightness, then the embodiment of step S901 may include: obtaining the welding temperature of the weld between the battery cell and the busbar in real time using the temperature measurement module, and simultaneously obtaining the welding brightness of the weld between the battery cell and the busbar in real time using the photoelectric module.

[0219] It is understood that the welding system can design sensor modules according to actual test requirements to complete the specified test tasks, which is not limited in the present embodiment.

[0220] Furthermore, corresponding to one or more of the welding parameters including welding temperature and welding brightness, one or more welding threshold ranges may also be set accordingly. For example, the welding threshold ranges include a first welding threshold range corresponding to the welding temperature and a second threshold range corresponding to the welding brightness.

[0221] In one embodiment, the welding parameters include welding temperature. Correspondingly, the specific method of determining whether the welding parameters are within the welding threshold range is: determining whether the welding temperature is within the corresponding first welding threshold range.

[0222] In one embodiment, the welding parameters include welding brightness. Correspondingly, the specific method of determining whether the welding parameters are within the welding threshold range is: determining whether the welding brightness is within the corresponding second welding threshold range.

[0223] It can be understood that the above embodiments can be combined with each other. For example, when the welding parameters include welding temperature and welding brightness, the specific method of determining whether the welding parameters are within the welding threshold range is: determining whether the welding temperature is within the corresponding first welding threshold range; and determining whether the welding brightness is within the corresponding second welding threshold range.

[0224] It is understandable that the welding threshold range can also be adaptively designed according to actual test needs to design the threshold conditions corresponding to the sensor module, thereby completing the specified threshold analysis task. This embodiment of the present application does not limit this.

[0225] See also Figure 10 In one embodiment of the present application, the welding threshold range includes a maximum value and a minimum value, and the welding abnormality alarm signal includes a blown weld alarm message corresponding to the maximum value and a cold weld alarm message corresponding to the minimum value. Correspondingly, step S902 may specifically be:

[0226] S9021: If the welding parameter is greater than the maximum value of the preset welding detection range, a welding explosion alarm message is output;

[0227] S9022: If the welding parameter is less than the minimum value of the preset welding detection range, a false welding alarm message is output.

[0228] The welding alarm signal indicates a possible welding problem on the battery cells and busbars. This information is sent to the warning module and the display module. The warning module triggers an alarm, and the display module displays the corresponding welding alarm screen, alerting management personnel to promptly check and adjust welding settings, or interrupt the welding process.

[0229] The cold soldering alarm signal indicates a possible cold soldering condition on the battery cells and busbars. This cold soldering alarm information is sent to the warning module and the display module. The warning module triggers an alarm action, and the display module displays the corresponding cold soldering alarm screen, alerting management personnel to promptly check, adjust welding settings, or interrupt the welding process.

[0230] The embodiment of the present application utilizes a blown weld alarm signal and a cold weld alarm signal to respectively alarm for blown welds and cold welds, so that management personnel can handle them in a targeted manner.

[0231] Specifically, step S9021 may be: determining whether the welding parameter is greater than the maximum value of the preset welding detection range, and if so, outputting a weld failure alarm; if not, executing step S9022. Step S9022 may be: determining whether the welding parameter is less than the minimum value of the preset welding detection range, and if so, outputting a cold weld alarm.

[0232] In one embodiment of the present application, the sensor module may include one or more of a temperature measurement module and a photoelectric module.

[0233] In one embodiment, the welding parameters include welding temperature.

[0234] Correspondingly, the specific method of step S9021 is: if the welding temperature is greater than the maximum value of the first welding threshold range, then output a blown weld alarm signal. The specific method of step S9022 is: if the welding temperature is less than the minimum value of the first welding threshold range, then output a cold weld alarm signal.

[0235] In one embodiment, the welding parameters include welding brightness.

[0236] Correspondingly, the specific method of step S9021 is: if the welding brightness is greater than the maximum value of the second welding threshold range, a blown weld alarm signal is output; if the welding brightness is less than the minimum value of the second welding threshold range, a cold weld alarm signal is output.

[0237] It is understood that the above embodiments can be combined with each other. For example, when the welding parameters include welding temperature and welding brightness, the corresponding specific method of step S9021 is:

[0238] If the welding temperature is greater than the maximum value of the first welding threshold range, or the welding brightness is greater than the maximum value of the second welding threshold range, a welding explosion alarm signal is output.

[0239] Correspondingly, the specific method of step S9022 is:

[0240] If the welding temperature is lower than the minimum value of the first welding threshold range, or the welding brightness is lower than the minimum value of the second welding threshold range, a cold welding alarm signal is output.

[0241] The embodiment of the present application obtains the welding temperature of the battery cell and the busbar during the welding process in real time through the temperature measurement module. When the welding temperature exceeds the maximum value of the first welding threshold range, it indicates that the risk of a blown weld of the battery cell and the busbar is relatively high, and a blown weld alarm signal is output so that the blown weld of the battery cell and the busbar can be checked in time; when the welding temperature is lower than the minimum value of the first welding threshold range, it indicates that the risk of a cold weld of the battery cell and the busbar can be relatively high, and a cold weld alarm signal is output so that the cold weld of the battery cell and the busbar can be checked in time.

[0242] On the other hand, the welding brightness of the battery cells and busbars during the welding process is obtained in real time through the photoelectric module. When the welding brightness exceeds the maximum value of the second welding threshold range, it indicates that there is a high risk of a blown weld on the battery cells and busbars, and a blown weld alarm signal is output so that the battery cells and busbars can be checked for blown welds in a timely manner; when the welding brightness is lower than the minimum value of the second welding threshold range, it indicates that there is a high risk of a poor weld on the battery cells and busbars, and a poor weld alarm signal is output so that the battery cells and busbars can be checked for poor welds in a timely manner.

[0243] Figure 3 This is a schematic diagram of the functional modules of a welding system provided in an embodiment of the present application. The welding system includes a clamping device 1, a sampling device 2, a welding device 3, and a controller 4. The clamping device 1, sampling device 2, and welding device 3 are all electrically connected to the controller 4 and operate in response to electrical signals from the controller 4.

[0244] The clamping device 1 is used to compress the busbar and battery cells, ensuring they are electrically connected but unwelded. The welding device 3 is used to weld the battery cells and busbar. The sampling device 2 is used to sample individual cell parameters and overall battery pack parameters and output test data. The controller 4 implements the welding detection method described in the above embodiment by reading and executing pre-stored program instructions.

[0245] See also Figure 2 and Figure 3 In one embodiment of the present application, the clamping device 1 includes a welding platen 11 and a welding claw 12. The welding claw 11 is disposed on the welding platen 12 and is used to clamp the busbar and the battery cell to maintain an electrical connection between the busbar and the battery cell when not welded. The sampling device 2 is fixed to the welding platen 11.

[0246] In the embodiment of the present application, the busbar and battery cells are compressed by the compression device 1, so that the sampling device 2 can perform a pre-welding test to obtain first test data. The first test data is the theoretical parameters of each battery cell and busbar after welding, as well as the overall parameters of the battery pack, and can reflect the actual performance and status of the battery cell and busbar before welding.

[0247] The busbars and cells are welded using welding equipment 3, allowing sampling equipment 2 to perform a post-weld test to obtain second test data. The second test data is the actual parameters of the cells and busbars after welding, as well as the overall parameters of the battery pack, and can reflect the actual performance and status of the cells and busbars after welding.

[0248] It can be understood that the beneficial effects that can be achieved by the welding system provided in the embodiment of the present application can refer to the beneficial effects of the corresponding welding detection method provided above, and will not be repeated here.

[0249] Figure 11 The figure is a flow chart of a welding method provided in the present application. The welding method is applied to the welding system of the above embodiment.

[0250] See also Figure 3 and Figure 11 , the welding method includes the following steps.

[0251] S1101 , compressing the battery cell and busbar to be tested by using a compressing device 1 so that the battery cell and busbar to be tested are in an electrically connected and unwelded state.

[0252] S1102: Test the battery cell and busbar using sampling device 2 to obtain first test data, and use a camera to photograph the battery cell and busbar to obtain a first height difference between the battery cell and the busbar. If the first test data is within the pre-weld threshold range and the first height difference is within the height threshold range, execute step S1103. If the first test data is not within the pre-weld threshold range or the first height difference is not within the height threshold range, suspend execution of step S1103.

[0253] S1103 , compress all battery cells and all bus bars by using the compressing device 1 , and weld the battery cells and bus bars by using the welding device 3 .

[0254] During the welding process, the welding parameters of the battery cells and busbars are acquired in real time, and when the welding parameters are out of the welding threshold range, a welding abnormality alarm signal is output.

[0255] S1104 : Test the battery cells and busbars using sampling device 2 to obtain second test data.

[0256] S1105: Analyze the first test data and the second test data.

[0257] When it is determined that the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, a welding abnormality alarm signal and welding fault point information are output.

[0258] The present embodiment utilizes pre-, mid-, and post-weld inspection and analysis of battery cells and busbars to comprehensively monitor battery pack production quality. Prior to welding, electrical performance testing and height difference analysis between the battery cells and busbars are performed to predict and intercept any poor or incomplete contact between the battery cells and busbars, reducing the risk of cold welds during welding. If pre-weld inspections pass, welding can proceed.

[0259] During the welding process, the sensor module monitors the temperature and brightness of the busbar surface in real time to analyze the stability of the physical reaction of the welding material during high-temperature melting and monitor the welding quality. After welding is completed, the changes in the battery cells and busbars before and after welding, as well as the impedance of the weld between the battery cells and busbars, are analyzed to determine whether the battery pack welding quality meets the standards. By analyzing the battery cells and busbars before, during, and after welding, an integrated control system can be implemented to systematically identify and avoid welding risks, intelligently monitor the entire welding process, and automatically judge the welding effect. This can effectively reduce welding hazards, identify poor welding, and improve the safety of the battery pack.

[0260] Figure 12 This is a schematic diagram of the structure of an electronic device provided in this application. The electronic device can implement the weld detection method of the above embodiment. The electronic device includes a memory and at least one processor. The memory is used to store program instructions and various data. The processor is used to read and execute the program instructions stored in the memory. When the program instructions are executed by the processor, the electronic device performs the above weld detection method.

[0261] In one embodiment of the present application, the electronic device may be a battery pack production line device such as a battery pack production device and a battery pack detection device.

[0262] The memory may include read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electronically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0263] The processor may include an integrated circuit, for example, a single packaged integrated circuit, or multiple packaged integrated circuits with the same or different functions, including combinations of microprocessors, digital processing chips, graphics processors, and various control chips. The at least one processor is the control core (Control Unit) of the controller, executing programs or modules stored in the memory and accessing data stored in the memory to perform various functions of the welding system and process data. The specific implementation of the aforementioned instructions by the at least one processor can be found in the description of the relevant steps in the aforementioned welding detection method and is not detailed here.

[0264] It can be understood that the beneficial effects that can be achieved by the electronic device provided in the embodiment of the present application can refer to the beneficial effects of the corresponding welding detection method provided above, and will not be repeated here.

[0265] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, as long as they are within the scope of the essence of the present application, appropriate changes and modifications made to the above embodiments should fall within the scope of protection claimed in the present application.

Claims

1. A welding detection method, characterized in that: Used to perform welding detection on a battery pack, the battery pack includes battery cells and busbars; the busbars are fixed to the battery cell poles of adjacent battery cells by welding to achieve series or parallel connection between multiple battery cells; the welding detection method includes: Acquire first test data, where the first test data is a parameter of each battery cell and a total parameter of the battery pack obtained by testing when the battery cell and the busbar are in an electrically connected and unwelded state; Acquire second test data, where the second test data is a parameter of each battery cell and a total parameter of the battery pack obtained by testing when the battery cell and the busbar are in a welded state; If the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, a welding abnormality alarm signal is output; The welding detection method further comprises: Obtaining a first height difference between the battery cell and the busbar, where the first height difference is a height difference obtained by testing when the battery cell and the busbar are in an electrically connected and unwelded state; Determining whether the first height difference is within a height threshold range; If so, a pre-weld inspection pass signal is output; the pre-weld inspection pass signal is used to control the welding equipment to allow the operation of welding the battery cell and the busbar only after receiving the pre-weld inspection pass signal; If not, an abnormal height warning signal is output; The welding detection method further comprises: Real-time acquisition of welding parameters of the battery cell and the busbar during the welding process; If the welding parameters are not within the welding threshold range, a welding abnormality alarm signal is output; if the welding parameters are not within the welding threshold range, a welding abnormality alarm signal is output, including: if the welding parameters are greater than the maximum value of the preset welding detection range, a blowout alarm message is output; if the welding parameters are less than the minimum value of the preset welding detection range, a cold weld alarm message is output.

2. The welding detection method according to claim 1, characterized in that: The welding detection method further comprises: If the difference between the corresponding parameters in the first test data and the second test data is greater than a preset threshold, the welding fault point is determined according to the parameter whose difference is greater than the preset threshold, and the welding fault point information is output.

3. The welding detection method according to claim 1, characterized in that: After the step of obtaining the first test data, the welding detection method further includes: Determining whether the first test data is within a test threshold range; If so, a pre-weld inspection pass signal is output; the pre-weld inspection pass signal is used to control the welding equipment to allow the operation of welding the battery cell and the busbar only after receiving the pre-weld inspection pass signal; If not, a cell abnormality alarm signal is output.

4. The welding detection method according to claim 1, characterized in that: After the step of obtaining the second test data, the welding detection method further includes: If the second test data is not within the test threshold range, the cell fault point is determined according to the parameters that are not within the test threshold range, and the cell fault point information is output.

5. A welding system, characterized in that: The welding system includes a pressing device, a welding device, a sampling device and a controller; The pressing device is used to press the busbar and the battery cell so that the battery cell and the busbar are in an electrically connected and unwelded state; The welding equipment is used to perform an operation of welding the battery core and the busbar; The sampling device is used to sample the parameters of each battery cell and the total parameters of the battery pack and output test data; The controller is used to execute the welding detection method according to any one of claims 1 to 4.

6. The welding system according to claim 5, characterized in that The pressing device includes a welding pressing plate and a welding pressing claw; the welding pressing claw is provided on the welding pressing plate; the welding pressing claw is used to press the busbar and the battery cell so that the battery cell and the busbar are in an electrically connected state when not welded; The sampling device is fixed to the welding platen.

7. An electronic device, characterized in that: include: a memory for storing program instructions; and A processor is configured to read and execute the program instructions stored in the memory, and when the program instructions are executed by the processor, the electronic device executes the welding detection method according to any one of claims 1 to 4.

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